阅读说明：本技术 一种高热收缩性bopet薄膜制备方法 (Preparation method of high-thermal-shrinkage BOPET film ) 是由 金怀龙 于 2020-03-31 设计创作，主要内容包括：本发明涉及塑料薄膜制造技术领域,且公开了一种高热收缩性BOPET薄膜制备方法,步骤一：制作上表层膜；步骤二：制作下表层膜；步骤三：制作芯层膜；步骤四：冷却处理；步骤五：将上表层膜、下表层膜和芯层膜辊压粘连；步骤六：卷绕打包,提高了制备BOPET薄膜的效率,同时制备的BOPET薄膜具备较高的高热收缩性。该高热收缩性BOPET薄膜制备方法,不仅制备BOPET薄膜的效率高,而且具备较好高热收缩性,从而保证了BOPET薄膜的生产效益。(The invention relates to the technical field of plastic film manufacturing, and discloses a preparation method of a high-thermal-shrinkage BOPET film, which comprises the following steps: manufacturing an upper surface film; step two: preparing a lower surface film; step three: manufacturing a core layer film; step four: cooling treatment; step five: rolling and adhering the upper surface film, the lower surface film and the core layer film; step six: and the BOPET film is wound and packed, so that the efficiency of preparing the BOPET film is improved, and the prepared BOPET film has high thermal shrinkage. The preparation method of the BOPET film with high thermal shrinkage has high efficiency of preparing the BOPET film and good high thermal shrinkage, thereby ensuring the production benefit of the BOPET film.)

1. A preparation method of a high thermal shrinkage BOPET film is characterized by comprising the following specific steps:

the method comprises the following steps: preparing an upper surface film, weighing 6-14 wt% of high-heat-shrinkage master batch, 50-60 wt% of PET polyester master batch, 10-20 wt% of PBT poly master batch and 0.5-1.5 wt% of modified polyethylene terephthalate master batch, putting the weighed high-heat-shrinkage master batch, PET polyester master batch, PBT poly master batch and modified polyethylene terephthalate master batch together into a mixer to be uniformly mixed, then melting the high-heat-shrinkage master batch, the PET polyester master batch, the PBT poly master batch and the modified polyethylene terephthalate master batch through a melting furnace, finally pouring the molten raw materials into a film extruder, and carrying out extrusion forming through the film extruder to obtain the upper surface film;

step two: preparing a lower surface film, weighing 10-20 wt% of high-heat-shrinkage master batch, 60-80 wt% of PET polyester master batch, 20-30 wt% of PBT poly master batch, 0.5-1.5 wt% of modified polyethylene terephthalate master batch and 5-10 wt% of polyethylene naphthalate, putting the weighed high-heat-shrinkage master batch, PET polyester master batch, PBT poly master batch, modified polyethylene terephthalate master batch and polyethylene naphthalate into a mixer together to be uniformly mixed, then melting the high-heat-shrinkage master batch, PET polyester master batch, PBT poly master batch and modified polyethylene terephthalate master batch through a melting furnace, finally pouring the melted raw materials into a film extruder, and carrying out extrusion forming through the film extruder to obtain the lower surface film;

step three: preparing a core layer film, weighing 10-20 wt% of high-heat-shrinkage master batch, 5-8 wt% of methyl methacrylate master batch and 45-60 wt% of PET polyester anti-adhesion master batch, pouring the weighed materials into a mixer for mixing, pouring the materials into a melting furnace for melting, and finally pouring the molten liquid into a film extruder for extrusion molding to form the core layer film;

step four: cooling, namely cooling the upper surface film, the lower surface film and the core layer film which are extruded and molded in the first step, the second step and the third step, wherein the cooling mode mainly adopts air cooling, the air cooling time is 2-3 hours, and the upper surface film, the lower surface film and the core layer film are wound on a winding roller for standby after cooling;

step five: rolling and adhering the upper surface film, the lower surface film and the core layer film, simultaneously placing the upper surface film, the lower surface film and the core layer film between the pressing rollers, and pressing the upper surface film, the lower surface film and the core layer film into a BOPET film;

step six: and (5) winding and packaging, namely winding and packaging the BOPET film which is rolled and adhered and molded in the step five.

2. The method for preparing a high thermal shrinkage BOPET film according to claim 1, wherein the method comprises the following steps: and in the first step, the second step and the third step, the mixer adopts a heating mixer, and a heating mechanism of the mixer adopts a resistance wire heating mechanism.

3. The method for preparing a high thermal shrinkage BOPET film according to claim 1, wherein the method comprises the following steps: the cooling mode in step four also adopts the water cooling, carries out long distance transport with last surface film, lower surface film and sandwich layer membrane respectively through the conveying roller, has the inside of conveying roller to let in the cooling water, can guarantee that last surface film, lower surface film and sandwich layer membrane obtain better cooling at the process of carrying.

4. The method for preparing a high thermal shrinkage BOPET film according to claim 1, wherein the method comprises the following steps: the film extruder is a single screw extruder.

5. The method for preparing a high thermal shrinkage BOPET film according to claim 1, wherein the method comprises the following steps: in the fifth step, before the upper surface film, the lower surface film and the core layer film are pressed, the surfaces of the upper surface film, the lower surface film and the core layer film need to be coated with the adhesion glue.

6. The method for preparing a high thermal shrinkage BOPET film according to claim 1, wherein the method comprises the following steps: the melting furnace is an incineration melting furnace.

7. The method for preparing a high thermal shrinkage BOPET film according to claim 1, wherein the method comprises the following steps: and in the sixth step, after being wound and packaged, the BOPET film is placed into a storage warehouse at normal temperature for storage.

Technical Field

The invention relates to the technical field of plastic film manufacturing, in particular to a preparation method of a high-thermal-shrinkage BOPET film.

Background

The PET film is a film with relatively comprehensive properties. The traditional PET film or PET heat-sealing film is mainly used in the fields of packaging and construction, and the market supply is greater than the demand at present.

The BOPET film for metal compounding comprises an upper surface layer, a core layer and a lower surface layer, wherein the core layer consists of 60-80% of PET polyester chips, 10-20% of PBT polyester chips and 10-20% of neopentyl glycol copolymerization modified PET polyester chips; the upper surface layer consists of 40 to 60 percent of bottle-grade PET polyester chips and 40 to 60 percent of PET polyester anti-sticking master batch; the lower surface layer is a methyl methacrylate graft copolymerization modified PETG heat-seal slice; compared with the traditional BOPET film and BOPET heat-sealing film.

The film is a CBABC five-layer structure film, wherein the layer A is an ultraviolet and infrared absorption layer, the layer B is a visible light absorption layer, the layer C is a surface hardening layer, and the total thickness is 80-120 um; the raw materials of the layer A consist of 96.5 to 97.5 weight percent of optical grade transparent PET slice, 2 to 2.5 weight percent of ultraviolet absorption master batch and 0.5 to 1 weight percent of infrared absorption master batch; the raw materials of the layer B consist of 95 to 97 weight percent of optical grade transparent PET slices and 3 to 5 weight percent of visible light absorption master batches; the C layer is plated with TiO2, so that the surface of the film obtains a hardening effect.

The two methods for preparing the BOPET film have lower efficiency, the preparation quality of the BOPET film cannot be ensured, and the prepared BOPET film has poor high thermal shrinkage, so that the production benefit of the BOPET film is reduced. Therefore, the invention provides a preparation method of a high-thermal-shrinkage BOPET film.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a preparation method of a BOPET film with high thermal shrinkage, which has high efficiency for preparing the BOPET film and better high thermal shrinkage, thereby ensuring the production benefit of the BOPET film, solving the problems that the prior mode for preparing the BOPET film has lower efficiency, the preparation quality of the BOPET film cannot be ensured, and the prepared BOPET film has poor high thermal shrinkage, thereby reducing the production benefit of the BOPET film.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a high thermal shrinkage BOPET film comprises the following specific steps:

the method comprises the following steps: preparing an upper surface film, weighing 6-14 wt% of high-heat-shrinkage master batch, 50-60 wt% of PET polyester master batch, 10-20 wt% of PBT poly master batch and 0.5-1.5 wt% of modified polyethylene terephthalate master batch, putting the weighed high-heat-shrinkage master batch, PET polyester master batch, PBT poly master batch and modified polyethylene terephthalate master batch together into a mixer to be uniformly mixed, then melting the high-heat-shrinkage master batch, the PET polyester master batch, the PBT poly master batch and the modified polyethylene terephthalate master batch through a melting furnace, finally pouring the molten raw materials into a film extruder, and carrying out extrusion forming through the film extruder to obtain the upper surface film;

step two: preparing a lower surface film, weighing 10-20 wt% of high-heat-shrinkage master batch, 60-80 wt% of PET polyester master batch, 20-30 wt% of PBT poly master batch, 0.5-1.5 wt% of modified polyethylene terephthalate master batch and 5-10 wt% of polyethylene naphthalate, putting the weighed high-heat-shrinkage master batch, PET polyester master batch, PBT poly master batch, modified polyethylene terephthalate master batch and polyethylene naphthalate into a mixer together to be uniformly mixed, then melting the high-heat-shrinkage master batch, PET polyester master batch, PBT poly master batch and modified polyethylene terephthalate master batch through a melting furnace, finally pouring the melted raw materials into a film extruder, and carrying out extrusion forming through the film extruder to obtain the lower surface film;

step three: preparing a core layer film, weighing 10-20 wt% of high-heat-shrinkage master batch, 5-8 wt% of methyl methacrylate master batch and 45-60 wt% of PET polyester anti-adhesion master batch, pouring the weighed materials into a mixer for mixing, pouring the materials into a melting furnace for melting, and finally pouring the molten liquid into a film extruder for extrusion molding to form the core layer film;

step four: cooling, namely cooling the upper surface film, the lower surface film and the core layer film which are extruded and molded in the first step, the second step and the third step, wherein the cooling mode mainly adopts air cooling, the air cooling time is 2-3 hours, and the upper surface film, the lower surface film and the core layer film are wound on a winding roller for standby after cooling;

step five: rolling and adhering the upper surface film, the lower surface film and the core layer film, simultaneously placing the upper surface film, the lower surface film and the core layer film between the pressing rollers, and pressing the upper surface film, the lower surface film and the core layer film into a BOPET film;

step six: and (5) winding and packaging, namely winding and packaging the BOPET film which is rolled and adhered and molded in the step five.

Preferably, the mixer in the first step, the second step and the third step adopts a heating mixer, and a heating mechanism of the mixer adopts a resistance wire heating mechanism.

Preferably, the cooling mode in the fourth step can also adopt water cooling, the upper surface film, the lower surface film and the core layer film are respectively conveyed by the conveying rollers for a long distance, and cooling water is introduced into the conveying rollers, so that the upper surface film, the lower surface film and the core layer film can be well cooled in the conveying process.

Preferably, the film extruder is a single screw extruder.

Preferably, in the fifth step, before the upper layer film, the lower layer film and the core layer film are pressed, the surfaces of the upper layer film, the lower layer film and the core layer film need to be coated with an adhesion glue.

Preferably, the melting furnace is an incineration melting furnace.

Preferably, after being wound and packaged, the BOPET film in the sixth step is put into a storage warehouse at normal temperature for storage.

(III) advantageous effects

Compared with the prior art, the invention provides a preparation method of a high-thermal-shrinkage BOPET film, which has the following beneficial effects:

the preparation method of the high-thermal-shrinkage BOPET film comprises the following steps: manufacturing an upper surface film; step two: preparing a lower surface film; step three: manufacturing a core layer film; step four: cooling treatment; step five: rolling and adhering the upper surface film, the lower surface film and the core layer film; step six: and the BOPET film is wound and packed, so that the efficiency of preparing the BOPET film is improved, and the prepared BOPET film has high thermal shrinkage.

Detailed Description

The invention discloses a preparation method of a high-thermal-shrinkage BOPET film, which can be realized by appropriately improving process parameters by taking the contents of the BOPET film as reference by a person skilled in the art. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the process of the present invention has been described in terms of preferred embodiments, it will be apparent to those skilled in the art that variations or modifications, as appropriate, may be made in the process of manufacture described herein to practice or use the techniques of the present invention without departing from the spirit, scope or intent of the invention. 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. The invention is further illustrated by the following examples.

A preparation method of a high thermal shrinkage BOPET film comprises the following specific steps:

the method comprises the following steps: preparing an upper surface film, weighing 6-14 wt% of high-heat-shrinkage master batch, 50-60 wt% of PET polyester master batch, 10-20 wt% of PBT poly master batch and 0.5-1.5 wt% of modified polyethylene terephthalate master batch, putting the weighed high-heat-shrinkage master batch, PET polyester master batch, PBT poly master batch and modified polyethylene terephthalate master batch together into a mixer to be uniformly mixed, then melting the high-heat-shrinkage master batch, the PET polyester master batch, the PBT poly master batch and the modified polyethylene terephthalate master batch through a melting furnace, finally pouring the molten raw materials into a film extruder, and carrying out extrusion forming through the film extruder to obtain the upper surface film;

step two: preparing a lower surface film, weighing 10-20 wt% of high-heat-shrinkage master batch, 60-80 wt% of PET polyester master batch, 20-30 wt% of PBT poly master batch, 0.5-1.5 wt% of modified polyethylene terephthalate master batch and 5-10 wt% of polyethylene naphthalate, putting the weighed high-heat-shrinkage master batch, PET polyester master batch, PBT poly master batch, modified polyethylene terephthalate master batch and polyethylene naphthalate into a mixer together to be uniformly mixed, then melting the high-heat-shrinkage master batch, PET polyester master batch, PBT poly master batch and modified polyethylene terephthalate master batch through a melting furnace, finally pouring the melted raw materials into a film extruder, and carrying out extrusion forming through the film extruder to obtain the lower surface film;

step three: preparing a core layer film, weighing 10-20 wt% of high-heat-shrinkage master batch, 5-8 wt% of methyl methacrylate master batch and 45-60 wt% of PET polyester anti-adhesion master batch, pouring the weighed materials into a mixer for mixing, pouring the materials into a melting furnace for melting, and finally pouring the molten liquid into a film extruder for extrusion molding to form the core layer film;

step four: cooling, namely cooling the upper surface film, the lower surface film and the core layer film which are extruded and molded in the first step, the second step and the third step, wherein the cooling mode mainly adopts air cooling, the air cooling time is 2-3 hours, and the upper surface film, the lower surface film and the core layer film are wound on a winding roller for standby after cooling;

step five: rolling and adhering the upper surface film, the lower surface film and the core layer film, simultaneously placing the upper surface film, the lower surface film and the core layer film between the pressing rollers, and pressing the upper surface film, the lower surface film and the core layer film into a BOPET film;

step six: and (5) winding and packaging, namely winding and packaging the BOPET film which is rolled and adhered and molded in the step five.

And in the first step, the second step and the third step, a heating mixer is adopted as a mixer, and a resistance wire heating mechanism is adopted as a heating mechanism of the mixer.

The cooling mode in step four also adopts the water cooling, carries out long distance transport through the conveying roller respectively with last tunic, lower surface film and sandwich layer membrane, has the inside of conveying roller to let in the cooling water, can guarantee that last tunic, lower surface film and sandwich layer membrane obtain better cooling at the process of carrying.

The film extruder is a single screw extruder.

In the fifth step, before the upper surface film, the lower surface film and the core layer film are pressed, the surfaces of the upper surface film, the lower surface film and the core layer film need to be coated with the adhesion glue.

The melting furnace is an incineration melting furnace.

And step six, after the BOPET film is wound and packaged, putting the BOPET film into a storage warehouse at normal temperature for storage.

In summary, through the steps of: manufacturing an upper surface film; step two: preparing a lower surface film; step three: manufacturing a core layer film; step four: cooling treatment; step five: rolling and adhering the upper surface film, the lower surface film and the core layer film; step six: and the BOPET film is wound and packed, so that the efficiency of preparing the BOPET film is improved, and the prepared BOPET film has high thermal shrinkage.

It is to be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.