阅读说明：本技术 再生ps塑料薄膜、声磁防盗标签、标签外壳及其制备方法 (Regenerated PS plastic film, acoustic-magnetic anti-theft label, label shell and preparation method thereof ) 是由 张曙 虞丽京 廖娜 杨梅 于 2021-07-26 设计创作，主要内容包括：本发明涉及材料技术领域,公开了一种再生PS塑料薄膜,其通过100％的废旧PS塑料制成,或通过废旧PS塑料和改性材料混合制成,其中,废旧塑料的含量大于等于1％且小于100％,改性材料的含量为大于0％且小于等于99％。本发明实施例利用废旧PS塑料制备再生PS塑料薄膜,能够节约资源。此外,通过改性材料改性废旧PS塑料,以提高塑料的性能,有利于制备符合性能良好的声磁防盗标签外壳。同时,本发明实施例还相应地提供了一种再生PS塑料薄膜的制备方法、及用该薄膜制成的声磁防盗标签外壳及其制备方法和相应的声磁防盗标签。(The invention relates to the technical field of materials, and discloses a regenerated PS plastic film which is prepared from 100% of waste PS plastics or prepared by mixing the waste PS plastics with modified materials, wherein the content of the waste plastics is more than or equal to 1% and less than 100%, and the content of the modified materials is more than 0% and less than or equal to 99%. The embodiment of the invention utilizes the waste PS plastic to prepare the regenerated PS plastic film, thereby saving resources. In addition, the waste PS plastic is modified by the modified material to improve the performance of the plastic, thereby being beneficial to preparing the acoustic-magnetic anti-theft label shell with good performance. Meanwhile, the embodiment of the invention also correspondingly provides a preparation method of the regenerated PS plastic film, an acoustic-magnetic anti-theft label shell prepared from the film, a preparation method of the acoustic-magnetic anti-theft label shell and a corresponding acoustic-magnetic anti-theft label.)

1. The regenerated PS plastic film is characterized by comprising waste PS plastics, wherein the content of the waste PS plastics is 100% based on the total weight of the regenerated PS plastic film.

2. The regenerated PS plastic film is characterized by comprising waste PS plastics and a modified material, wherein the content of the waste PS plastics is more than or equal to 1% and less than 100%, and the content of the modified material is more than 0% and less than or equal to 99%, based on the total weight of the regenerated PS plastic film.

3. The recycled PS plastic film as claimed in claim 2, wherein the content of the waste PS plastic is 10 to 76% and the content of the modified material is 24 to 90% based on the total weight of the recycled PS plastic film.

4. The recycled PS plastic film as claimed in claim 2, wherein said modifying material comprises at least one of virgin PS and auxiliary agents.

5. The recycled PS plastic film of claim 4, wherein the adjuvant comprises a toughening agent.

6. The recycled PS plastic film of claim 5, wherein the toughening agent comprises at least one of SBS and SBR.

7. The recycled PS plastic film of claim 6, wherein said adjuvant further comprises OMMT, said toughening agent is SBS; based on the total weight of the regenerated PS plastic film, the content of SBS is more than 0% and less than or equal to 25%, and the content of OMMT is more than 0% and less than or equal to 6%.

8. The recycled PS plastic film as claimed in claim 7, wherein the SBS content is 20% and the OMMT content is 4% based on the total weight of the recycled PS plastic film.

9. The recycled PS plastic film of claim 6 wherein said adjuvant further comprises OMMT, said toughening agent is SBR; based on the total weight of the regenerated PS plastic film, the content of SBR is 25-35%, and the content of OMMT is 2-6%.

10. The recycled PS plastic film as claimed in claim 9, wherein the content of SBR is 30% and the content of OMMT is 4% based on the total weight of the recycled PS plastic film.

11. The recycled PS plastic film of claim 6 wherein said adjuvant further comprises OMMT, said toughening agents comprise SBS and SBR; based on the total weight of the regenerated PS plastic film, the content of SBS is more than 0% and less than or equal to 25%, the content of SBR is more than 0% and less than or equal to 35%, the content of OMMT is more than 0% and less than or equal to 6%, and the total content of SBS, SBR and OMMT is less than or equal to 60%.

12. The recycled PS plastic film of any one of claims 2 to 11, wherein the recycled PS plastic is recycled HIPS plastic and the waste PS plastic is waste HIPS plastic.

13. A method of preparing the recycled PS plastic film according to claim 1, comprising:

granulating the waste PS plastic;

preparing the granulated waste PS plastic into a film to obtain a regenerated PS plastic film; wherein, based on the total weight of the regenerated PS plastic film, the content of the waste PS plastic is 100 percent.

14. The method for recycling the PS plastic film according to claim 13, wherein the step of forming the granulated waste PS plastic into a film to obtain the recycled PS plastic film comprises:

and preparing the granulated waste PS plastic into a film by adopting an extrusion casting molding process or a film blowing molding process to obtain the regenerated PS plastic film.

15. A method of preparing a recycled PS plastic film according to any one of claims 2 to 12, comprising:

mixing the waste PS plastic and the modified material;

granulating the mixed waste PS plastic and modified material to obtain regenerated PS plastic;

preparing the regenerated PS plastic into a film to obtain a regenerated PS plastic film;

wherein the content of the waste PS plastic is more than or equal to 1% and less than 100%, and the content of the modified material is more than 0% and less than or equal to 99%, based on the total weight of the regenerated PS plastic film.

16. The method for recycling a PS plastic film according to claim 15, wherein the step of forming the recycled PS plastic into a film to obtain a recycled PS plastic film comprises:

and preparing the regenerated PS plastic into a film by adopting an extrusion tape casting process or a film blowing process to obtain the regenerated PS plastic film.

17. The method for recycling a PS plastic film according to claim 15 or 16, wherein at least one of an antistatic agent, a flame retardant and a coloring agent is added in the process of forming a recycled PS plastic film using a recycled PS plastic.

18. An acoustic-magnetic anti-theft tag shell, characterized by comprising a sealing layer and a regenerated PS plastic film according to any one of claims 1-12, wherein the regenerated PS plastic film is laminated with the sealing layer.

19. The acoustic-magnetic anti-theft tag housing according to claim 18, wherein the thickness of the recycled PS plastic film is 0.20-0.45 mm.

20. The acousto-magnetic anti-theft tag housing according to claim 18, characterized in that the thickness of the acousto-magnetic anti-theft tag housing is 0.23-0.45 mm.

21. The acoustic-magnetic anti-theft tag housing according to claim 18, wherein said sealing layer is a PE film or a PP film.

22. The acoustic-magnetic anti-theft tag shell according to claim 18, wherein the sealing layer comprises 1-100% recycled PE film, or 1-100% recycled PP film.

23. A method of making an acousto-magnetic anti-theft tag housing according to any one of claims 18-22, comprising:

arranging a sealing layer on the regenerated PS plastic film to obtain a shell material of the acoustic-magnetic anti-theft label; wherein the regenerated PS plastic film is prepared by the preparation method of the regenerated PS plastic film as claimed in any one of claims 13-17;

the shell of the acoustic-magnetic anti-theft tag is made of the acoustic-magnetic anti-theft tag shell material.

24. The method for preparing an acoustic-magnetic anti-theft tag shell according to claim 23, wherein the sealing layer is a PE film; the method is characterized in that a sealing layer is arranged on the regenerated PS plastic film to obtain the shell material of the acoustic-magnetic anti-theft tag, and specifically comprises the following steps:

compounding the regenerated PS plastic film with a PE film to obtain a composite film;

adopting a thermoforming process at 50-80 ℃ to make the composite film into a shell of the acoustic-magnetic anti-theft soft label; wherein the thermoforming process is a plastic-suction forming process or a compression molding process of concave-convex upper and lower dies.

25. An acousto-magnetic anti-theft tag, characterized in that it comprises an acousto-magnetic anti-theft tag housing according to any one of claims 18-22.

26. The acousto-magnetic anti-theft tag according to claim 25, further comprising at least one resonance sheet, a sealing cover, a bias sheet, a double-sided tape and a separation tape, wherein the sealing layer of the acousto-magnetic anti-theft tag housing is connected to the sealing cover, a cavity is provided between the sealing layer and the sealing cover, the resonance sheet is accommodated in the cavity, the bias sheet is fixed to the sealing cover by one side of the double-sided tape, and the other side of the double-sided tape is connected to the separation tape.

27. The acousto-magnetic anti-theft tag according to claim 25, characterized in that the recycled PS plastic has a notched impact strength of 5.7-17.0KJ/m²The thickness of the regenerated PS plastic film is 0.20-0.45 mm.

28. The acousto-magnetic anti-theft tag according to any one of claims 25-27, characterized in that when a 2mm wide film strip is cut out of the acousto-magnetic anti-theft tag housing, the film strip is folded back completely in half in the length direction of the film strip before being unfolded without brittle fracture.

Technical Field

The invention relates to the technical field of materials, in particular to a regenerated PS plastic film, an acoustic-magnetic anti-theft label, a label shell and a preparation method thereof.

Background

At present, the acoustic magnetic anti-theft label is generally composed of a plastic shell (mainly composed of Polystyrene (PS) film)/Polyethylene (PE), a non-wafer, a semi-hard magnetic sheet, a PE/polyethylene Terephthalate (PET) sealing cover material, adhesive sticker adhesive paper and other multilayer structures, is a large amount of disposable consumables, is mainly used for anti-theft in places such as global retail supermarkets, markets, chain stores and the like, and has a consumption amount of hundreds of billions of sheets every year. The acousto-magnetic anti-theft label is mainly attached to a commodity package, a customer can pay at a cashier desk for demagnetization after selecting the commodity, if a thief tries to take the commodity out of a shop without paying, the label can trigger alarm when the commodity passes through a doorway acousto-magnetic alarm antenna, and therefore the anti-theft effect is achieved. After the customer pays, the cashier demagnetizes and decodes the label, and the commodity is taken out of the store, so that the alarm is not triggered. This is an important anti-theft measure for the retail industry to open shelves and sell at present. The PS in the discarded label cannot be recovered after use, and the environment is easily polluted. With the introduction of "plastic limit order" in various countries, merchants need to have an acousto-magnetic label that uses a certain degree of recycled plastic to accomplish a continuously enhanced environment-friendly task.

The person skilled in the art generally considers that the PS plastic of the housing of the acoustic-magnetic anti-theft tag has certain requirements on mechanical properties such as fluidity, bending strength, impact strength, elongation at break and the like, and stability. Some recycled PS masterbatches are currently on the market, but most of these materials are recycled from rigid thick sheet products (originally high impact polystyrene HIPS) (e.g. used television housings), which are easily brittle, so that the skilled person cannot think of using them to make non-brittle film rolls of 0.20-0.45mm thickness. Analysis by gel chromatography shows that the molecular weight of the recovered PS material on the market is reduced, the molecular weight distribution is widened, and the dispersion degree PD value is increased, for example, the waste PS plastic is degraded to a certain extent after being used for a long time and is decomposed into small molecules. Although it is calculated that more than 84% of macromolecules in the waste PS plastic are not subjected to chain scission degradation according to the definition of the number average molecular weight of the polymer, the impact strength of the waste HIPS plastic is greatly reduced compared with that of a new material through mechanical property tests, and the notched impact strength of the cantilever beam is reduced to 5.7kJ/m 2. The material does not have high impact resistance, and is changed into general polystyrene PS. The above data make the persons skilled in the art think that the performance of the recycled PS material in the market is relatively poor, and brittle failure is easy to occur, so that it is difficult to meet the requirements for manufacturing the shell of the acoustic-magnetic anti-theft soft label. Therefore, in the market at present, only a few brand PS brand new materials are used for manufacturing the shell of the acoustic-magnetic anti-theft label, and the acoustic-magnetic anti-theft label with the shell made of the regenerated PS material is not available.

Disclosure of Invention

The embodiment of the invention aims to overcome the technical pain, and provides a regenerated PS plastic film, an acoustic-magnetic anti-theft label, a label shell and a preparation method thereof, wherein the regenerated PS plastic film can be prepared from waste PS plastics so as to save resources and meet the urgent requirements of customers on environment-friendly and green acoustic-magnetic anti-theft labels.

In order to solve the technical problem, an embodiment of the present invention provides a recycled PS plastic film, which includes waste PS plastics, and the content of the waste PS plastics is 100% by total weight of the recycled PS plastic film.

In order to solve the same technical problem, an embodiment of the present invention further provides a recycled PS plastic film, which includes waste PS plastics and a modified material, wherein based on the total weight of the recycled PS plastic film, the content of the waste PS plastics is greater than or equal to 1% and less than 100%, and the content of the modified material is greater than 0% and less than or equal to 99%.

Preferably, the content of the waste PS plastic is 10-76% and the content of the modified material is 24-90% based on the total weight of the regenerated PS plastic film.

Preferably, the modified material comprises at least one of a virgin material PS and an auxiliary agent.

Preferably, the auxiliary agent comprises a toughening agent.

Preferably, the toughening agent includes at least one of SBS and SBR.

Preferably, the auxiliary agent further comprises OMMT, and the toughening agent is SBS; based on the total weight of the regenerated PS plastic film, the content of SBS is more than 0% and less than or equal to 25%, and the content of OMMT is more than 0% and less than or equal to 6%.

Preferably, the content of SBS is 20% and the content of OMMT is 4% based on the total weight of the regenerated PS plastic film.

Preferably, the auxiliary agent further comprises OMMT, and the toughening agent is SBR; based on the total weight of the regenerated PS plastic film, the content of SBR is 25-35%, and the content of OMMT is 2-6%.

Preferably, the content of SBR is 30 percent and the content of OMMT is 4 percent based on the total weight of the regenerated PS plastic film.

Preferably, the auxiliary agent further comprises OMMT, and the toughening agent comprises SBS and SBR; based on the total weight of the regenerated PS plastic film, the content of SBS is more than 0% and less than or equal to 25%, the content of SBR is more than 0% and less than or equal to 35%, the content of OMMT is more than 0% and less than or equal to 6%, and the total content of SBS, SBR and OMMT is less than or equal to 60%.

As a preferred scheme, the regenerated PS plastic is regenerated HIPS plastic, and the waste PS plastic is waste HIPS plastic.

In order to solve the same technical problem, an embodiment of the present invention further provides a method for preparing the recycled PS plastic film, including:

granulating the waste PS plastic;

preparing the granulated waste PS plastic into a film to obtain a regenerated PS plastic film; wherein, based on the total weight of the regenerated PS plastic film, the content of the waste PS plastic is 100 percent.

As a preferred scheme, the method for preparing the film from the granulated waste PS plastic to obtain the regenerated PS plastic film specifically comprises the following steps:

and preparing the granulated waste PS plastic into a film by adopting an extrusion casting molding process or a film blowing molding process to obtain the regenerated PS plastic film.

In order to solve the same technical problem, an embodiment of the present invention further provides a method for preparing the recycled PS plastic film, including:

mixing the waste PS plastic and the modified material;

granulating the mixed waste PS plastic and modified material to obtain regenerated PS plastic;

preparing the regenerated PS plastic into a film to obtain a regenerated PS plastic film;

wherein the content of the waste PS plastic is more than or equal to 1% and less than 100%, and the content of the modified material is more than 0% and less than or equal to 99%, based on the total weight of the regenerated PS plastic film.

As a preferred scheme, the step of preparing the recycled PS plastic into a film to obtain a recycled PS plastic film specifically comprises:

and preparing the regenerated PS plastic into a film by adopting an extrusion tape casting process or a film blowing process to obtain the regenerated PS plastic film.

Preferably, at least one of an antistatic agent, a flame retardant and a colorant is added in the process of preparing the regenerated PS plastic film by using the regenerated PS plastic.

In order to solve the same technical problem, an embodiment of the present invention further provides an acoustic-magnetic anti-theft tag housing, including a sealing layer and the regenerated PS plastic film, where the regenerated PS plastic film and the sealing layer are stacked.

Preferably, the thickness of the regenerated PS plastic film is 0.20-0.45 mm.

Preferably, the thickness of the shell of the acoustic magnetic anti-theft tag is 0.23-0.45 mm.

Preferably, the sealing layer is a PE film or a PP film.

Preferably, the material of the sealing layer comprises 1-100% of regenerated PE film, or the material of the sealing layer comprises 1-100% of regenerated PP film.

In order to solve the same technical problem, an embodiment of the present invention further provides a method for preparing the acoustic magnetic anti-theft tag housing, including:

arranging a sealing layer on the regenerated PS plastic film to obtain a shell material of the acoustic-magnetic anti-theft label; wherein the regenerated PS plastic film is prepared by the preparation method of the regenerated PS plastic film;

the shell of the acoustic-magnetic anti-theft tag is made of the acoustic-magnetic anti-theft tag shell material.

Preferably, the sealing layer is a PE film; the method is characterized in that a sealing layer is arranged on the regenerated PS plastic film to obtain the shell material of the acoustic-magnetic anti-theft tag, and specifically comprises the following steps:

compounding the regenerated PS plastic film with a PE film to obtain a composite film;

adopting a thermoforming process at 50-80 ℃ to make the composite film into a shell of the acoustic-magnetic anti-theft soft label; wherein the thermoforming process is a plastic-suction forming process or a compression molding process of concave-convex upper and lower dies.

In order to solve the same technical problem, the embodiment of the invention also provides an acoustic-magnetic anti-theft tag, which comprises the acoustic-magnetic anti-theft tag shell.

As a preferred scheme, the acoustic-magnetic anti-theft tag further comprises at least one resonance sheet, a sealing cover, a bias sheet, a double-faced adhesive tape and a separation tape, wherein the sealing layer of the acoustic-magnetic anti-theft tag shell is connected with the sealing cover, a cavity is arranged between the sealing layer and the sealing cover, the resonance sheet is accommodated in the cavity, the bias sheet is fixed on the sealing cover by one face of the double-faced adhesive tape, and the other face of the double-faced adhesive tape is connected with the separation tape.

Preferably, the recycled PS plastic has a notched impact strength of 5.7 to 17.0KJ/m²The thickness of the regenerated PS plastic film is 0.20-0.38 mm.

Preferably, when a 2mm wide film strip is cut by the acoustic magnetic anti-theft tag shell, the film strip is completely folded in half along the length direction of the film strip and then unfolded, so that the film strip is not fragile and broken.

Compared with the prior art, the embodiment of the invention has the beneficial effects that: the embodiment of the invention provides a regenerated PS plastic film, which is prepared from 100% of waste PS plastics or waste PS plastics and modified materials, wherein the content of the waste PS plastics is more than or equal to 1% and less than 100%, and the content of the modified materials is more than 0% and less than or equal to 99%. In addition, the waste PS plastic is modified by the modified material to improve the performance of the plastic, thereby being beneficial to preparing the acoustic-magnetic anti-theft label shell with good performance. Meanwhile, the embodiment of the invention also correspondingly provides a preparation method of the regenerated PS plastic film, a sound-magnetic anti-theft label shell, a preparation method of the sound-magnetic anti-theft label shell and a sound-magnetic anti-theft label.

Drawings

FIG. 1 is a schematic structural diagram of an acoustic-magnetic security tag in an embodiment of the present invention;

FIG. 2 is a flow chart of a manufacturing process of a recycled PS plastic film according to an embodiment of the present invention;

wherein, 1, the acoustic magnetic anti-theft label shell; 2. a resonance plate; 3. sealing the cover; 4. a biasing sheet; 5. double-sided adhesive tape; 51. a double-sided adhesive tape base band; 52. a glue layer; 6. separating the belt.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In one embodiment provided by the invention, the regenerated PS plastic film comprises waste PS plastics, and the content of the waste PS plastics is 100% based on the total weight of the regenerated PS plastic film. The regenerated PS plastic film is made of 100% of waste PS plastics, and the waste PS plastics are utilized to the maximum extent to prepare the regenerated PS plastic film, so that more resources are saved as far as possible, and the regenerated PS plastic film can be used for preparing the sound-magnetic anti-theft label shell with good performance.

The invention is characterized in that the regenerated PS plastic is regenerated HIPS plastic, and the waste PS plastic is waste HIPS plastic.

In an alternative embodiment, when the present inventors used 100% rigid waste PS thick plate plastic to melt and form a film, they found that a flexible 0.20-0.45mm film can be successfully formed without brittle fracture as in the thick plate, so that the 0.20-0.45mm recycled PS of the present invention can be directly used as the housing of the acoustic-magnetic anti-theft tag without modification without brittle fracture, which produces unexpected technical effects.

Accordingly, the embodiment of the present invention further provides a method for preparing a recycled PS plastic film, including:

granulating the waste PS plastic;

preparing the granulated waste PS plastic into a film to obtain a regenerated PS plastic film; wherein, based on the total weight of the regenerated PS plastic film, the content of the waste PS plastic is 100 percent.

In practice, since the recycled raw materials (e.g., waste tv housing plastics) have many different materials, such as some tv housings are PC/ABS, PS can be separated from other materials by infrared or density separation to obtain pure PS recycle for subsequent regeneration and modified regeneration. For example, the recycled waste tv housing plastic may be first crushed, cleaned, separated, dried, etc. to obtain the waste PS plastic.

Specifically, the method for preparing the granulated waste PS plastic into the film to obtain the regenerated PS plastic film specifically comprises the following steps: and preparing the granulated waste PS plastic into a film by adopting an extrusion casting molding process or a film blowing molding process to obtain the regenerated PS plastic film.

In the embodiment of the invention, the thickness of the regenerated PS plastic film is 0.20-0.45 mm.

In another embodiment, the regenerated PS plastic film comprises waste PS plastics and a modified material, wherein the content of the waste PS plastics is more than or equal to 1% and less than 100% and the content of the modified material is more than 0% and less than or equal to 99% based on the total weight of the regenerated PS plastic film.

In the embodiment, the regenerated PS plastic film is prepared from the waste PS plastics and the modified materials, wherein the content of the waste PS plastics is more than or equal to 1% and less than 100%, and the content of the modified materials is more than 0% and less than or equal to 99%, so that the waste PS plastics are fully utilized to prepare the regenerated PS plastic film, and more resources are saved as far as possible. In specific application, when the source of the waste PS recycled material is insufficient or in order to further improve the performance of the regenerated PS plastic film, the waste PS plastic can be modified by adding the modified material, so that the preparation of the acoustic-magnetic anti-theft tag shell with good performance is facilitated.

Particularly, the waste materials and the modified recycling technology thereof are applied to manufacturing the recycled plastic acoustic-magnetic anti-theft label, namely, the green (GreenInitiative) acoustic-magnetic anti-theft soft label is advocated, so that the pollution of a large amount of waste electrical equipment such as waste television shell plastics to the environment can be relieved, waste materials can be changed into things of value, and resources can be saved. In addition, the impact strength of the plastic can be improved by blending, toughening and modifying the waste PS plastic, the tensile strength and the bending strength are kept, and meanwhile, under the condition of keeping good fluidity, a 0.20-0.45mm regenerated PS film can be manufactured, and then the regenerated PS film is adopted to manufacture the shell of the acoustic-magnetic label so as to meet the requirement of producing a 'green initiative' acoustic-magnetic anti-theft soft label.

In a specific implementation, the content of the waste PS plastic is greater than or equal to 1% and less than 100%, for example, may be 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 60%, 65%, 70%, 73%, 76%, 80%, 82%, 85%, 88%, 90%, 92%, 95%, 99%, etc., and the specific content may be set according to an actual requirement, which is not described herein for further details. The content of the modified material is greater than 0% and less than or equal to 99%, and may be, for example, 1%, 5%, 10%, 15%, 20%, 24%, 25%, 26%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 99%, etc., and the specific content thereof may be set according to actual requirements, which is not described herein in further detail. Preferably, the content of the waste PS plastic is 10-76% and the content of the modified material is 24-90% based on the total weight of the regenerated PS plastic film.

In an alternative embodiment, the modifying material comprises at least one of virgin PS and auxiliary agents. Illustratively, the adjuvant comprises a toughening agent. The toughening agent includes at least one of SBS and SBR. In the embodiment of the invention, because SBS and SBR are good toughening agents, and simultaneously, because the molecular chain segments of SBS, SBR and waste PS plastics contain styrene units, the toughening agents SBR and SBS have good compatibility with the waste PS plastics and can toughen the waste PS plastics to a certain extent, optionally, the auxiliary agent can also comprise OMMT, and the waste PS plastics are modified by adopting the OMMT, so that the impact strength, the tensile strength, the bending strength and the fluidity of the plastics are improved, and the preparation of the shell of the acoustic-magnetic anti-theft label with good performance is facilitated.

In an alternative embodiment, the toughening agent is SBS (i.e., styrene-butadiene-styrene block copolymer); the content of SBS is greater than 0% and not more than 25%, for example, 1%, 3%, 5%, 7%, 9%, 10%, 13%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, etc. based on the total weight of the recycled PS plastic film; the content of OMMT (i.e., nano organic montmorillonite) is more than 0% and not more than 6%, and may be, for example, 1%, 2%, 3%, 4%, 5%, 6%, etc. Preferably, the content of SBS is 15-25% and the content of OMMT is 2-6% based on the total weight of the regenerated PS plastic film. Illustratively, the content of SBS and OMMT is 20% and 4% based on the total weight of the regenerated PS plastic film.

In an alternative embodiment, the toughening agent is SBR (i.e., styrene butadiene rubber); the content of SBR is 25-35% of the total weight of the regenerated PS plastic film, for example, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35% and the like; the OMMT content is 2 to 6%, and may be, for example, 2%, 3%, 4%, 5%, 6%, or the like. Illustratively, the content of SBR is 30 percent and the content of OMMT is 4 percent based on the total weight of the regenerated PS plastic film.

In an alternative embodiment, the toughening agent includes SBS and SBR; the content of SBS is greater than 0% and not more than 25%, for example, 1%, 3%, 5%, 7%, 9%, 10%, 13%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, etc. based on the total weight of the recycled PS plastic film; the content of SBR is more than 0% and not more than 35%, and may be, for example, 1%, 3%, 5%, 10%, 15%, 20%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, or the like; the content of OMMT is more than 0% and not more than 6%, and may be, for example, 1%, 2%, 3%, 4%, 5%, 6%, or the like; and the total content of SBS, SBR and OMMT is less than or equal to 60%, and may be, for example, 32%, 35%, 37%, 39%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, etc.

It should be noted that the impact of the toughening agent SBR or SBS on the flow rate of the modified waste PS plastic melt is great, and with the increase of the toughening agent, the flow rate of the modified PS plastic melt is increased and the uniformity is improved. The total amount of the SBS, SBR and OMMT modified materials of the embodiment of the invention is not more than 60 percent. The OMMT is equivalent to a physical crosslinking point in a toughened and modified waste PS plastic matrix, when the content of the OMMT is low, the intercalation process is easy to balance and can be stripped or completely embedded, and the OMMT sheet can reinforce the modified plastic in a two-dimensional direction, so that the elastic modulus of the modified material is obviously improved along with the increase of the content of the OMMT; when the OMMT content is increased continuously, only a part of OMMT is stripped or intercalated by the modified plastic, while the other part of OMMT can only exist in an original particle state, and at the moment, part of OMMT is agglomerated, and as a result, the effect of OMMT on molecular chains of the modified plastic in two-dimensional directions is weakened, so that the bending strength of the composite material is reduced. The bending properties of the nanocomposite can be improved by adding a small amount of OMMT. The elongation at break of the modified waste PS plastic is slightly less with the increase of the nano organic montmorillonite, but the reduction is not large.

Accordingly, the embodiment of the present invention further provides a method for preparing a recycled PS plastic film, including:

mixing the waste PS plastic and the modified material;

granulating the mixed material to obtain regenerated PS plastic;

preparing the regenerated PS plastic into a film to obtain a regenerated PS plastic film;

wherein the content of the waste PS plastic is more than or equal to 1% and less than 100%, and the content of the modified material is more than 0% and less than or equal to 99%, based on the total weight of the regenerated PS plastic film.

In particular embodiments, as shown in fig. 2, since the recycled raw materials (e.g., waste tv housing plastics) have many different materials, such as some tv housings are PC/ABS, PS can be separated from other materials by infrared or density separation to obtain pure PS recycle for subsequent modification. For example, referring to fig. 2, the recycled waste tv housing plastic may be first crushed, cleaned, separated, dried, and the like to obtain the waste PS plastic, so that the waste PS plastic may be further mixed with a new material PS, an auxiliary agent, and other modified materials, and granulated to obtain a regenerated PS plastic, and then the regenerated PS plastic may be further made into a desired product according to actual use requirements.

In an alternative embodiment, the step of making the recycled PS plastic into a film to obtain a recycled PS plastic film specifically includes:

and preparing the regenerated PS plastic into a film by adopting an extrusion tape casting process or a film blowing process to obtain the regenerated PS plastic film.

In an alternative embodiment, at least one of an antistatic agent, a flame retardant and a colorant is added during the process of forming the recycled PS plastic film using the recycled PS plastic. In the specific implementation, the PS film can be prepared by mixing a new material PS into the regenerated PS plastic, and of course, substances can be added according to the actual use requirements, which is not described herein.

Correspondingly, the embodiment of the invention also provides an acoustic-magnetic anti-theft tag shell which comprises a sealing layer and the regenerated PS plastic film provided by any one of the embodiments, wherein the regenerated PS plastic film and the sealing layer are arranged in a laminated mode.

In an alternative embodiment, the recycled PS plastic film has a thickness of 0.25 to 0.45 mm.

In an optional embodiment, the thickness of the acoustic magnetic anti-theft tag shell is 0.25-0.45 mm.

In an alternative embodiment, the sealing layer is a PE film or a PP film.

In an alternative embodiment, the material of the sealing layer comprises 1-100% recycled PE film, or the material of the sealing layer comprises 1-100% recycled PP film.

Correspondingly, the embodiment of the invention also provides a method for preparing the acoustic magnetic anti-theft tag shell, which comprises the following steps:

arranging a sealing layer on the regenerated PS plastic film to obtain a shell material of the acoustic-magnetic anti-theft label; wherein the regenerated PS plastic film is prepared by the preparation method of the regenerated PS plastic film;

the shell of the acoustic-magnetic anti-theft tag is made of the acoustic-magnetic anti-theft tag shell material.

In an alternative embodiment, the sealing layer is a PE film; the method is characterized in that a sealing layer is arranged on the regenerated PS plastic film to obtain the shell material of the acoustic-magnetic anti-theft tag, and specifically comprises the following steps:

compounding the regenerated PS plastic film with a PE film to obtain a composite film;

adopting a thermoforming process at 50-80 ℃ to make the composite film into a shell of the acoustic-magnetic anti-theft soft label; wherein the thermoforming process is a plastic-suction forming process or a compression molding process of concave-convex upper and lower dies.

Correspondingly, the embodiment of the invention also provides the acoustic-magnetic anti-theft tag, which comprises the acoustic-magnetic anti-theft tag shell.

As shown in fig. 1, in an optional implementation manner, the acoustic-magnetic anti-theft tag further includes at least one resonance sheet 2, a sealing cover 3, a bias sheet 4, a double-sided tape 5, and a separation tape 6, a sealing layer of the acoustic-magnetic anti-theft tag housing 1 is connected to the sealing cover 3, a cavity is disposed between the sealing layer and the sealing cover 3, the resonance sheet 2 is accommodated in the cavity, the bias sheet 4 is fixed to the sealing cover 3 by one surface of the double-sided tape 5, and the other surface of the double-sided tape 5 is connected to the separation tape.

In the specific implementation, the acoustic-magnetic anti-theft tag shell 1 made of a PS/PE composite film and the sealing cover 3 made of a PE/PET composite film are used, and the resonance piece 2 is sealed into the resonance cavity of the plastic shell 1 on the PE/PE surface (namely the PE surface of the acoustic-magnetic anti-theft tag shell 1 and the PE surface of the sealing cover 3) by heat sealing. Then, the bias sheet 4 is fixed on the PET surface of the packaged acoustic magnetic anti-theft label shell 1 by using a double-sided adhesive tape 5, and the label is taken down from the separation tape 6 after die cutting and can be pasted on the surface of a commodity for use. Illustratively, the acoustic-magnetic anti-theft tag casing 1 is a PS/PE composite film material, that is, the acoustic-magnetic anti-theft tag casing whose sealing layer is a PE film has a thickness of 0.23-0.45mm, the sealing cover 3 is a PE/PET composite film and has a thickness of about 0.1mm, the double-sided adhesive tape 5 includes a double-sided adhesive tape base tape 51 and adhesive layers 52 disposed on two sides of the double-sided adhesive tape base tape 51, the double-sided adhesive tape base tape 51 is PET and has a thickness of about 0.01 mm. Of course, the acoustic-magnetic anti-theft tag can be set to other structures according to actual use requirements, and further details are not described herein.

In an alternative embodiment, the recycled PS plastic has a notched impact strength of 5.7 to 17.0KJ/m²The thickness of the regenerated PS plastic film is 0.20-0.45 mm.

In an alternative embodiment, when the acoustic magnetic anti-theft tag shell cuts a 2mm wide film strip, the film strip is completely folded in half along the length direction of the film strip and then unfolded without brittle fracture.

In the specific implementation, the shell of the acoustic magnetic label is cut into a strip with the width of 2mm, and the shell of the acoustic magnetic label can be checked to be a brittle or tough material by fully bending, folding and unfolding. Illustratively, a 2mm wide strip of the label housing is cut and, after being folded fully in half along its length, the strip unfolds without breaking, i.e., the strip does not break fully at the fold, if not after folding, blush or partially break and no break is considered to be a non-frangible break.

The following embodiments are provided to illustrate the method for manufacturing the housing of the acoustic-magnetic anti-theft tag according to the present invention.

Example 1

Based on the total weight of the regenerated PS plastic film, 100 percent of waste PS plastic is adopted to prepare the regenerated PS plastic film, although the notch impact strength of the material is only 5.7KJ/m²However, the extrusion casting process can successfully produce the regenerated PS plastic film with the thickness of 0.25-0.38mm, and then the regenerated PS plastic film is compounded with the PE film and then is subjected to thermoforming (plastic suction molding or compression molding by concave-convex upper and lower dies) at 50-80 ℃ to form the shell of the acoustic-magnetic anti-theft soft label. At the moment, a strip with the width of two millimeters is cut from the label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture.

Example 2

Toughening and modifying the waste PS plastic by using a rubber elastomer SBS: based on the total weight of the regenerated PS plastic film, the content of the waste PS plastic is 76 percent, the addition amount of SBS is 20 percent, the addition amount of OMMT is 4 percent, and the notch impact strength of the modified waste PS plastic reaches the maximum value of 12.96KJ/m²5.7KJ/m before toughening modification²Increased by 7.26KJ/m²The tensile strength of the alloy reaches better performance, and is specifically 30.07 MPa.

The regenerated PS plastic film with the thickness of 0.25-0.38mm is prepared by an extrusion tape casting process, antistatic agent, color master and the like are added in the film preparation process, the regenerated PS plastic film is compounded with the PE film, and then the shell of the acoustic-magnetic anti-theft soft label is prepared by thermoforming (plastic suction molding or compression molding of concave-convex upper and lower dies) at 50-80 ℃. At the moment, a strip with the width of two millimeters is cut from the label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture.

Example 3

Toughening and modifying the waste PS plastic by using a rubber elastomer SBR: based on the total weight of the regenerated PS plastic film, the waste PS plastic content is 66 percent, the SBR addition amount is 30 percent, the addition amount mass fraction of the OMMT is 4 percent, and the notch impact strength of the modified waste PS plastic reaches the maximum value of 11.86KJ/m²5.7KJ/m before toughening modification²Increased by 6.16KJ/m²The tensile strength of the alloy reaches better performance, specifically 28.67 MPa. At the moment, a strip with the width of two millimeters is cut from the label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture.

Example 4

Based on the total weight of the regenerated PS plastic film, toughening and modifying the waste PS plastic by using a rubber elastomer SBS and SBR: based on the total weight of the regenerated PS plastic film, the content of the waste PS plastic is 51 percent, and the total amount of the SBS, SBR and OMMT three modified materials is 49 percent. At the moment, a strip with the width of two millimeters is cut from the label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture.

Example 5

Based on the total weight of the regenerated PS plastic film, 51 percent of regenerated PS plastic and 49 percent of new PS are adopted to prepare the regenerated PS plastic film. Specifically, a regenerated PS plastic film with the thickness of 0.25-0.38mm is prepared by a film blowing forming process, an antistatic agent, a flame retardant and the like are added in the film preparation process, the regenerated PS plastic film is compounded with a PE film, and the shell of the acoustic-magnetic anti-theft label is prepared by thermoforming (plastic suction or compression molding of concave-convex upper and lower dies) at 50-80 ℃. At the moment, a strip with the width of two millimeters is cut from the label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture.

Example 6

Based on the total weight of the regenerated PS plastic film, 10 percent of regenerated PS plastic and 90 percent of new PS are adopted to prepare the regenerated PS plastic film. Specifically, a regenerated PS plastic film with the thickness of 0.25-0.38mm is prepared by a film blowing forming process, an antistatic agent, a flame retardant and the like are added in the film preparation process, the regenerated PS plastic film is compounded with a PE film, and the shell of the acoustic-magnetic anti-theft label is prepared by thermoforming (plastic suction or compression molding of concave-convex upper and lower dies) at 50-80 ℃. At the moment, a strip with the width of two millimeters is cut from the label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture.

Example 7

Toughening and modifying the waste PS plastic by using a rubber elastomer SBS: the content of the waste PS plastic is 95 percent based on the total weight of the regenerated PS plastic film, the addition amount of SBS is 5 percent, the regenerated PS plastic film with the thickness of 0.25-0.38mm is prepared by an extrusion tape casting process, antistatic agent, color master batch and the like are added in the film preparation process, the regenerated PS plastic film is compounded with the PE film, and then the PE film is subjected to thermoforming (plastic suction molding or compression molding by a concave-convex upper mold and a convex-lower mold) at 50-80 ℃ to prepare the shell of the acoustic-magnetic anti-theft soft label. At the moment, a strip with the width of two millimeters is cut from the label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture.

Example 8

Based on the total weight of the regenerated PS plastic film, 100 percent of the regenerated PS plastic is adopted to prepare the PS film, wherein the rubber elastomer SBS is used for toughening and modifying the waste PS plastic: based on the total weight of the regenerated PS plastic film, the content of the waste PS plastic is 90 percent, the addition amount of SBS is 10 percent, the regenerated PS plastic film with the thickness of 0.25-0.38mm is prepared by an extrusion tape casting process, antistatic agent, color master batch and the like are added in the film preparation process, the regenerated PS plastic film is compounded with the PE film, and then the PE film is subjected to thermoforming (plastic suction molding or compression molding by a concave-convex upper mold and a convex-lower mold) at 50-80 ℃ to prepare the shell of the acoustic-magnetic anti-theft soft label. At the moment, a strip with the width of two millimeters is cut from the label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture.

Example 9

Toughening and modifying the waste PS plastic by using a rubber elastomer SBS: based on the total weight of the regenerated PS plastic film, the content of the waste PS plastic is 82 percent, the addition of SBS is 10 percent and the addition of the new PS material is 8 percent, the regenerated PS plastic film with the thickness of 0.25-0.38mm is prepared by an extrusion tape casting process, antistatic agent, color master batch and the like are added in the film preparation process, the regenerated PS plastic film is compounded with a PE film, and then the shell of the acoustic-magnetic anti-theft soft label is prepared by thermoforming (plastic suction molding or compression molding of concave-convex upper and lower dies) at 50-80 ℃. At the moment, a strip with the width of two millimeters is cut from the label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture.

Example 10

Based on the total weight of the regenerated PS plastic film, 1 percent of waste PS plastic and 99 percent of new PS are adopted to prepare the PS film. Specifically, a regenerated PS plastic film with the thickness of 0.25-0.38mm is prepared by a film blowing forming process, an antistatic agent, a flame retardant and the like are added in the film preparation process, the regenerated PS plastic film is compounded with a PE film, and the shell of the acoustic-magnetic anti-theft label is prepared by thermoforming (plastic suction or compression molding of concave-convex upper and lower dies) at 50-80 ℃. At the moment, a strip with the width of two millimeters is cut from the label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture.

Example 11

Based on the total weight of the regenerated PS plastic film, 100 percent of waste PS plastic is adopted to prepare the regenerated PS plastic film, but the regenerated PS plastic film with the thickness of 0.31-0.45mm can be successfully prepared by an extrusion tape casting process, then the regenerated PS plastic film is compounded with 100 percent of regenerated PE film (0.06mm), and then the shell of the acoustic-magnetic anti-theft soft label is prepared by thermoforming (compression molding and plastic forming) at 50-80 ℃. At the moment, a strip with the width of two millimeters is cut from one label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture. The resonance piece (1-5 pieces, 2 pieces in this example) is put into the cavity of the other prepared label shell, the PE/PE surface is heat sealed by PE/PET (sealing cover material), the bias piece is fixed above the cavity by glue, then the double-sided glue and the separating bottom tape are covered, and the sound magnetic anti-theft label of the invention is die-cut.

Example 12

Based on the total weight of the regenerated PS plastic film, 100 percent of waste PS plastic is adopted to prepare the regenerated PS plastic film, but the regenerated PS plastic film with the thickness of 0.20-0.32mm can be successfully prepared by an extrusion tape casting process, and then the regenerated PS plastic film is compounded with 1 percent of regenerated PP film (0.03mm), and then the shell of the acoustic-magnetic anti-theft soft label is prepared by thermoforming (compression molding by concave-convex upper and lower dies) at 50-80 ℃. At the moment, a strip with the width of two millimeters is cut from one label shell, and the label shell is completely folded in half along the length direction and then unfolded without brittle fracture. The resonance piece (1-5 pieces, 4 pieces in this example) is put into the cavity of the other prepared label shell, the PP/PP face is heat sealed by PP/PET (sealing cover material), the bias piece is fixed above the cavity by glue, then the double-sided glue and the separation bottom tape are covered, and the sound magnetic anti-theft label of the invention is die-cut.

It should be noted that, according to chinese patent with patent application No. CN201711280664.8, the following steps can be used to determine whether the sample of the PS part of the shell of the acoustic magnetic label contains recycled polystyrene plastic: (1) taking a sample of a PS part of the shell of the acoustic magnetic label; (2) identifying the sample by at least three methods of infrared spectrum analysis, headspace gas chromatography analysis, electron microscope analysis and element distribution analysis; when the at least three methods are adopted for identification, the at least three methods can determine that the sample contains 1-100% of the recycled polystyrene plastic.

Compared with the prior art, the embodiment of the invention has the beneficial effects that: the embodiment of the invention provides a regenerated PS plastic film, which is prepared from 100% of waste PS plastics or waste PS plastics and modified materials, wherein the content of the waste PS plastics is more than or equal to 1% and less than 100%, and the content of the modified materials is more than 0% and less than or equal to 99%. In addition, the waste PS plastic is modified by the modified material to improve the performance of the plastic, thereby being beneficial to preparing the acoustic-magnetic anti-theft label shell with good performance. Meanwhile, the embodiment of the invention also correspondingly provides a preparation method of the regenerated PS plastic film, a sound-magnetic anti-theft label shell, a preparation method of the sound-magnetic anti-theft label shell and a sound-magnetic anti-theft label.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.