阅读说明：本技术 一种聚烯烃薄膜用母料及其制备方法 (Master batch for polyolefin film and preparation method thereof ) 是由 刘鹏 雷周桥 许卫民 黎泽顺 卢俊文 于 2020-11-17 设计创作，主要内容包括：本发明公开了一种聚烯烃薄膜用母料及其制备方法。该聚烯烃薄膜用母料,包括如下重量份的组分：超高分子量聚乙烯50-70份、长链烷基硅油0.5-5份、低分子量聚四氟乙烯0.5-5份及聚烯烃15-50份；其制备方法是：将超高分子量聚乙烯、长链烷基硅油、低分子量聚四氟乙烯及聚烯烃采用高速混合机混合均匀。本发明所述聚烯烃薄膜用母料,具有低摩擦系数、抗粘连、高透明、耐迁移的优点。(The invention discloses a master batch for a polyolefin film and a preparation method thereof. The master batch for the polyolefin film comprises the following components in parts by weight: 50-70 parts of ultra-high molecular weight polyethylene, 0.5-5 parts of long-chain alkyl silicone oil, 0.5-5 parts of low molecular weight polytetrafluoroethylene and 15-50 parts of polyolefin; the preparation method comprises the following steps: mixing the ultra-high molecular weight polyethylene, the long chain alkyl silicone oil, the low molecular weight polytetrafluoroethylene and the polyolefin uniformly by a high-speed mixer. The master batch for the polyolefin film has the advantages of low friction coefficient, adhesion resistance, high transparency and migration resistance.)

1. A master batch for polyolefin films comprises the following components in parts by weight: 50-70 parts of ultra-high molecular weight polyethylene, 0.5-5 parts of long-chain alkyl silicone oil, 0.5-5 parts of low molecular weight polytetrafluoroethylene and 15-50 parts of polyolefin.

2. A master batch for polyolefin films according to claim 1, characterized in that: the molecular weight of the ultra-high molecular weight polyethylene is 100-250 ten thousand.

3. A master batch for polyolefin films according to claim 1, characterized in that: the viscosity of the long-chain alkyl silicone oil is 50-150 ten thousand.

4. A master batch for polyolefin films according to claim 1, characterized in that: the molecular weight of the low molecular weight polytetrafluoroethylene is 0.5-10 ten thousand.

5. A master batch for polyolefin films according to claim 1, characterized in that: the polyolefin is one or more of low density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer and ethylene-propylene-octene copolymer.

6. A master batch for polyolefin films according to any one of claims 1 to 5, characterized in that: the master batch for the polyolefin film further comprises an auxiliary material, and the auxiliary material comprises an antioxidant.

7. A master batch for polyolefin films according to claim 6, characterized in that: the antioxidant is one or more of hindered phenol, phosphite ester and thioether antioxidant.

8. A method for preparing master batch for polyolefin film is characterized by comprising the following steps:

the preparation method comprises the following steps of uniformly mixing ultrahigh molecular weight polyethylene, long chain alkyl silicone oil, low molecular weight polytetrafluoroethylene and polyolefin to obtain a mixture, and performing melt extrusion, drying, cooling, granulating and molding on the mixture.

9. The method for producing a master batch for polyolefin films according to claim 8, characterized in that: the ultrahigh molecular weight polyethylene, the long chain alkyl silicone oil, the low molecular weight polytetrafluoroethylene and the polyolefin are uniformly mixed by a high-speed mixer.

10. The method for producing a master batch for polyolefin films according to claim 8, characterized in that: and melting and extruding the mixture by a double-screw extruder, wherein the production temperature of the double-screw extruder is 160-220 ℃, and the rotating speed of a main machine is 250-450 r/min.

Technical Field

The invention belongs to the technical field of functional additives for plastic films, and particularly relates to a master batch for a polyolefin film and a preparation method thereof.

Background

Plastic packages and plastic package products have a larger share in the market, and particularly, composite plastic flexible packages are widely applied to the fields of food, medicine, chemical industry and the like, wherein the proportion of the plastic packages is the largest, such as beverage packages, quick-frozen food packages, steamed and cooked food packages, fast food packages and the like, and the plastic packages and the plastic package products bring great convenience to the life of people.

Plastic films have a blocking phenomenon, so-called "blocking", i.e. the phenomenon of adhesion between contacting layers of plastic film, which makes it difficult to separate the films in contact with each other. The adhesion problem of plastic films is mainly caused by two reasons, namely that the smooth plastic film surface is closely contacted to almost completely isolate air, and a vacuum tight sealing state is formed between the films, so that the plastic films are not easy to separate. Secondly, a large number of exposed molecular chains exist on the surface of the plastic film after the plastic film is formed, and the molecular chains are intertwined with each other after the two layers of films are closed to cause adhesion between the films, so that the films cannot be opened. The reason why the film opening is difficult is actually that both coexist, and the latter is the main reason. The simplest method for solving the problem of adhesion of the plastic film is to add an anti-adhesion agent and a slipping agent in a certain proportion.

Diatomaceous earth is commonly used as an anti-blocking agent for films, but it reduces film gloss and process equipment is prone to wear. Talc is also widely used in films as an anti-blocking agent, and is inexpensive, has good gloss and low mechanical abrasion compared to diatomaceous earth, but has a high haze and cannot be used as an anti-blocking agent for films with better optical properties. In contrast, synthetic silica is a very effective anti-blocking agent, which has the advantages of amorphous structure, light weight, high anti-sticking efficiency, extremely high chemical purity, and suitability for plastic packaging in the food industry. For example, the Chinese published patent applications CN101265349B, CN103694525A, CN105985576A, CN106750749A, CN109851887A, CN107540942A, CN108912480A and CN110183768A all adopt silica anti-blocking additives. However, it is also considered that silica has a high hardness and is liable to wear a machine and form scratches on the surface of the film.

Spherical inorganic anti-blocking agents are also widely used in order to reduce scratches on the surface of the film. Such as: the Chinese published patent application CN111040390A discloses a preparation method of a near-spherical sodium aluminum calcium silicate anti-adhesion master batch, the near-spherical sodium aluminum calcium silicate anti-adhesion master batch prepared by the method has low hygroscopicity, no adhesion and easy dispersion, can be used for preparing high-concentration master batches, has a friction coefficient reduced from 0.6 to about 0.15-0.30, and is not easy to form scratches on the surface of a film and has small abrasion to extruder equipment because the sodium aluminum calcium silicate anti-adhesion agent is in a nearly perfect spherical shape. The Chinese published patent application CN103865182A discloses a high surface tension composite type smooth anti-blocking master batch for BOPP films, which adopts glass beads as anti-blocking agents. CN106832547A discloses an opening slipping agent master batch which adopts spherical alumina as an anti-sticking agent. Although these antiblocking agents have a good antiblocking effect and reduce scratches on the film surface. However, these antiblocking agents have a high hardness (Mohs hardness 6-7) and still cause considerable wear on the equipment.

With the development of modern plastic film processing toward automation, high speed and high quality, the film is required to have a low friction coefficient. Inorganic antiblocking agents do not achieve a low coefficient of friction and most films are therefore reduced by the addition of migrating organic slip agents. For example, chinese patent CN101475074B discloses a self-lubricating polyethylene film, which is formed by co-extruding and blowing low-density polyethylene, linear low-density polyethylene, metallocene linear low-density polyethylene, erucamide or its substitute, and an auxiliary agent. Chinese published patent application CN101864109A discloses a composite type slipping master batch for BOPP films, which comprises 10-20 parts of polypropylene 80-90 composite type slipping agent, wherein the composite type slipping agent adopts a complexing agent of erucamide and polyolefin amide. Chinese published patent application CN103849031A discloses an antistatic and smooth polyethylene color master batch and a preparation method thereof, and discloses a polyethylene film which is prepared from 15-25 parts of high-pressure low-density polyethylene, 20-35 parts of linear low-density polyethylene, 30-70 parts of octene-ethylene polymer, 1-4 parts of a slipping agent and 0.01-0.05 part of an antifoaming agent, wherein the slipping agent is oleamide, erucamide or hexamethylene dioleamide and the like. These patents all employ amide slip agents. However, the amide slipping agent has a great defect that after the film is manufactured, the slipping and anti-blocking effect can be exerted after a period of time elapses and the slipping agent migrates from the inside of the film to the surface of the film, and the slipping and opening performance of the amide slipping agent gradually decreases with the increase of the service time, and the amide slipping agent migrates to the surface of the product and easily causes pollution to the product.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the master batch for the polyolefin film, which has the advantages of low friction coefficient, blocking resistance, high transparency and migration resistance.

The invention also provides a preparation method of the master batch for the polyolefin film, which can stably prepare the master batch for the polyolefin film.

The invention achieves the aim through the following technical scheme, and the master batch for the polyolefin film comprises the following components in parts by weight: 50-70 parts of ultra-high molecular weight polyethylene, 0.5-5 parts of long-chain alkyl silicone oil, 0.5-5 parts of low molecular weight polytetrafluoroethylene and 15-50 parts of polyolefin.

The master batch for the polyolefin film adopts the ultrahigh molecular weight polyethylene and the polyolefin, the ultrahigh molecular weight polyethylene and the polyolefin are not completely compatible, and the ultrahigh molecular weight polyethylene can generate micro-protrusions in the film manufacturing process, so that the surface of the film is microscopically roughened, and the excellent opening performance of the film is realized; meanwhile, the refractive index of the ultrahigh molecular weight polyethylene is the same as that of PP and PE, so that the transparency of the film product is not influenced; the hardness of the ultra-high molecular weight polyethylene is obviously lower than that of the traditional silicate anti-blocking agent, and the screw and the mouth mold of processing equipment cannot be damaged; in addition, the temperature resistance and the migration resistance are obviously higher than those of amide organic slipping agents.

In one embodiment, the molecular weight of the ultra-high molecular weight polyethylene is 100-.

In one embodiment, the viscosity of the long-chain alkyl silicone oil is 50 to 150 ten thousand.

In one embodiment, the low molecular weight polytetrafluoroethylene has a molecular weight of 0.5 to 10 ten thousand.

In one embodiment, the polyolefin is one or more of low density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene-propylene-octene copolymer.

In one embodiment, the master batch for polyolefin films further comprises an auxiliary material, and the auxiliary material comprises an antioxidant.

In one embodiment, the antioxidant is one or more of hindered phenols, phosphites, and thioethers.

The invention also provides a preparation method of the master batch for the polyolefin film, which comprises the following steps:

the preparation method comprises the following steps of uniformly mixing ultrahigh molecular weight polyethylene, long chain alkyl silicone oil, low molecular weight polytetrafluoroethylene and polyolefin to obtain a mixture, and performing melt extrusion, drying, cooling, granulating and molding on the mixture.

The method for preparing the master batch for the polyolefin film can stably prepare the master batch for the polyolefin film.

In one embodiment, the ultra-high molecular weight polyethylene, the long chain alkyl silicone oil, the low molecular weight polytetrafluoroethylene and the polyolefin are mixed uniformly by a high-speed mixer.

In one embodiment, the mixture is melt-extruded by a double-screw extruder, the production temperature of the double-screw extruder is 160-220 ℃, and the rotating speed of a main machine is 250-450 r/min.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments thereof will be described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The master batch for the polyolefin film comprises the following components in parts by weight: 50-70 parts of ultra-high molecular weight polyethylene, 0.5-5 parts of long-chain alkyl silicone oil, 0.5-5 parts of low molecular weight polytetrafluoroethylene and 15-50 parts of polyolefin.

For example, ultra-high molecular weight polyethylene 50 parts, 55 parts, 58 parts, 63 parts, 65 parts, and 70 parts; 0.5 part, 0.8 part, 1.2 parts, 1.5 parts, 3 parts, 4 parts, 5 parts and 6 parts of long-chain alkyl silicone oil; low molecular weight polytetrafluoroethylene 0.5 parts, 1, 1.2 parts, 1.8 parts, 3 parts, 4 parts, 5 parts and 6 parts; 15 parts, 18 parts, 25 parts, 30 parts, 32 parts, 40 parts, 45 parts and 50 parts of polyolefin. The above components are not limited to the above examples, and may be arbitrarily adjusted within the range.

The master batch for the polyolefin film adopts the ultrahigh molecular weight polyethylene and the polyolefin, the ultrahigh molecular weight polyethylene and the polyolefin are not completely compatible, and the ultrahigh molecular weight polyethylene can generate micro-protrusions in the film manufacturing process, so that the surface of the film is microscopically roughened, and the excellent opening performance of the film is realized; meanwhile, the refractive index of the ultrahigh molecular weight polyethylene is the same as that of PP and PE, so that the transparency of the film product is not influenced, the excellent opening performance of the film is realized, the transparency of the film product is not influenced, and a screw and a neck mold of processing equipment are not damaged; the hardness of the ultra-high molecular weight polyethylene is obviously lower than that of the traditional silicate anti-blocking agent, and the screw and the mouth mold of processing equipment cannot be damaged; in addition, the water-based oil-based composite material does not contain organic micromolecular slipping agents, and is obviously higher in temperature resistance and migration resistance than amide organic slipping agents. When the product is used in the preparation process of a film product, a sliding layer is formed on the surface of the film, the friction coefficient of the film product can reach below 0.2, and the smooth opening performance of the film product is still well maintained along with the prolonging of the service life; the optical performance of polyolefin film products is not affected, the attenuation of the surface tension of the film after corona of the products is slow, the stability is good, and the film is suitable for printing, coating, aluminizing or compounding.

Therefore, the master batch for the polyolefin film has the advantages of low friction coefficient, blocking resistance, high transparency and migration resistance, and is different from the prior technical scheme.

In addition, the price of the ultra-high molecular weight polyethylene is obviously lower than that of inorganic anti-blocking agents such as silicon dioxide and the like, so that the price of the master batch is also lower, and the competitiveness of the product is improved.

Wherein:

the molecular weight of the ultra-high molecular weight polyethylene is 100-250 ten thousand. The ultra-high molecular weight polyethylene is a thermoplastic engineering plastic with a linear structure and excellent comprehensive performance, has super wear resistance, self-lubricating property, higher strength, stable chemical property and strong ageing resistance, the viscosity of the molten state is as high as 108Pa.s, the fluidity is extremely poor, and the melt index is almost zero. The molecular weight influences the properties, and the molecular weight is selected within the range of 100-. The hardness of the ultra-high molecular weight polyethylene is obviously lower than that of the traditional silicate anti-blocking agent, the screw and the die of processing equipment cannot be damaged, and the price is also advantageous.

The polyolefin is one or more of low density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer and ethylene-propylene-octene copolymer. Preferably, the melt index of the polyolefin is from 2g/10min to 20g/10 min. Ultra-high molecular weight polyethylene is generally more difficult to process and such polyolefins can improve the processability of the masterbatch and facilitate distributive mixing of the masterbatch in the film article.

The viscosity of the long-chain alkyl silicone oil is 50-150 ten thousand, the modified polysiloxane has the characteristics of excellent lubricating property, demolding property, hydrophobicity, antifouling property, paintability and good compatibility with organic polymers, and particularly has good lubricating effect on aluminum, zinc and copper with poor lubricating property. It can also be used as demoulding agent and fibre lubricant for plastics, and the impact strength can be greatly raised by adding a small quantity of long-chain alkyl silicone oil into polyolefine. The long-chain alkyl silicone oil has good high temperature resistance, low crosslinking degree, good compatibility with polyolefin and excellent migration resistance, and can obviously reduce the friction coefficient of products and improve the opening smoothness of the products.

The molecular weight of the low molecular weight polytetrafluoroethylene is 0.5-10 ten thousand. The low molecular weight polytetrafluoroethylene is prepared from low molecular weight polytetrafluoroethylene. More preferably, the polytetrafluoroethylene with the molecular weight of 0.5-5 ten thousand is selected, the melting point of the low molecular weight polytetrafluoroethylene is more than 300 ℃, and the polytetrafluoroethylene has excellent temperature resistance; because the low molecular weight polytetrafluoroethylene has fine and soft particle size, better dispersing ability and can be uniformly dispersed in the polyolefin, and the surface energy of the low molecular weight polytetrafluoroethylene is low, the friction coefficient of the product can be obviously reduced, and the opening smoothness of the product can be improved.

Further, the master batch for the polyolefin film also comprises auxiliary materials, and the auxiliary materials comprise antioxidants. Of course, the auxiliary materials can also comprise other auxiliary materials which are added according to the functional requirements.

The antioxidant is one or more of hindered phenol, phosphite ester and thioether antioxidant. Wherein the hindered phenol antioxidant is antioxidant 1076, 1010, 330, etc. The phosphite antioxidant is 168, 626, etc., and the thioether antioxidant is DLTP, DSTP, etc.

The invention also provides a preparation method of the master batch for the polyolefin film, which comprises the following steps:

the preparation method comprises the following steps of uniformly mixing ultrahigh molecular weight polyethylene, long chain alkyl silicone oil, low molecular weight polytetrafluoroethylene and polyolefin to obtain a mixture, and performing melt extrusion, drying, cooling, granulating and molding on the mixture.

The method for preparing the master batch for the polyolefin film can stably prepare the master batch for the polyolefin film.

Wherein the content of the first and second substances,

the ultra-high molecular weight polyethylene, the long chain alkyl silicone oil, the low molecular weight polytetrafluoroethylene and the polyolefin are uniformly mixed by a high-speed mixer.

And melting and extruding the mixture by a double-screw extruder, wherein the production temperature of the double-screw extruder is 160-220 ℃, the rotating speed of a main machine is 250-450 r/min, and the rotating speed of the screws is 300-350 rpm. The above parameters are the most preferable parameters, and the product can be successfully processed under other parameters, but the product performance and the yield are not as high as those under the parameters.

Embodiments of the present invention will be further illustrated by the following examples.

Example one

The master batch for the polyolefin film comprises the following components in parts by weight: 50 parts of ultra-high molecular weight polyethylene with the molecular weight of 200 ten thousand, 5 parts of long-chain alkyl silicone oil with the viscosity of 150 ten thousand, 5 parts of polytetrafluoroethylene with the molecular weight of 5 ten thousand, 10 parts of homopolymerized polypropylene with the melt index of 7 and 30 parts of ethylene-propylene block copolymer with the melt index of 10.

The preparation method comprises the following steps: and uniformly mixing the weighed raw materials in a high-speed mixer, melting and extruding the mixed materials through a double-screw extruder, cooling, drying and granulating to obtain the master batch, wherein the production temperature of the double-screw extruder is 220 ℃, the rotating speed of a host is controlled at 250r/min, and the rotating speed of a screw is 300 rpm.

Example two

The master batch for the polyolefin film comprises the following components in parts by weight: 70 parts of ultra-high molecular weight polyethylene with the molecular weight of 100 ten thousand, 3 parts of long-chain alkyl silicone oil with the viscosity of 100 ten thousand, 2 parts of polytetrafluoroethylene with the molecular weight of 2 ten thousand, 10101 parts of antioxidant, 1682 parts of antioxidant and 22 parts of homopolymerized polypropylene with the melt index of 20.

The preparation method comprises the following steps: and uniformly mixing the weighed raw materials in a high-speed mixer, melting and extruding the mixed materials through a double-screw extruder, cooling, drying and granulating to obtain the master batch. Wherein the production temperature of the double-screw extruder is 210 ℃, the rotating speed of the main machine is controlled at 350r/min, and the rotating speed of the screw is 350 rpm.

EXAMPLE III

The master batch for the polyolefin film comprises the following components in parts by weight: 60 parts of ultra-high molecular weight polyethylene with the molecular weight of 150 ten thousand, 1 part of long-chain alkyl silicone oil with the viscosity of 100 ten thousand, 3 parts of polytetrafluoroethylene with the molecular weight of 3 ten thousand, 20 parts of ethylene-propylene-octene copolymer with the melt index of 10 and 16 parts of LLDPE with the melt index of 2.

The preparation method comprises the following steps: and uniformly mixing the weighed raw materials in a high-speed mixer, melting and extruding the mixed materials through a double-screw extruder, cooling, drying and granulating to obtain the master batch. Wherein the production temperature of the double-screw extruder is 190 ℃, the rotating speed of the main machine is controlled at 300r/min, and the rotating speed of the screw is 320 rpm.

Example four

The master batch for the polyolefin film comprises the following components in parts by weight: 60 parts of ultrahigh molecular weight polyethylene with the molecular weight of 250 ten thousand, 0.5 part of long-chain alkyl silicone oil with the viscosity of 50 ten thousand, 0.5 part of polytetrafluoroethylene with the molecular weight of 10 ten thousand and 15 parts of ethylene-propylene-octene copolymer with the melt index of 10.

The preparation method comprises the following steps: and uniformly mixing the weighed raw materials in a high-speed mixer, melting and extruding the mixed materials through a double-screw extruder, cooling, drying and granulating to obtain the master batch, wherein the production temperature of the double-screw extruder is 220 ℃, the rotating speed of a host is controlled at 250r/min, and the rotating speed of a screw is 300 rpm.

EXAMPLE five

The master batch for the polyolefin film comprises the following components in parts by weight: 50 parts of ultra-high molecular weight polyethylene with the molecular weight of 200 ten thousand, 5 parts of long-chain alkyl silicone oil with the viscosity of 150 ten thousand, 2 parts of polytetrafluoroethylene with the molecular weight of 0.5 ten thousand, 20 parts of homopolymerized polypropylene with the melt index of 7 and 30 parts of ethylene-propylene block copolymer with the melt index of 10.

The preparation method comprises the following steps: and uniformly mixing the weighed raw materials in a high-speed mixer, melting and extruding the mixed materials through a double-screw extruder, cooling, drying and granulating to obtain the master batch, wherein the production temperature of the double-screw extruder is 220 ℃, the rotating speed of a host is controlled at 250r/min, and the rotating speed of a screw is 300 rpm.

Comparative example 1

The master batch for the polyolefin film described in the comparative example comprises the following components in parts by weight: 5 parts of synthetic silica with the average particle size of 3um, 5 parts of erucamide, 22.5 parts of homopolymerized polypropylene with the melt index of 7 and 67.5 parts of ethylene-propylene block copolymer with the melt index of 10.

The preparation method comprises the following steps: and uniformly mixing the weighed raw materials in a high-speed mixer, melting and extruding the mixed materials through a double-screw extruder, cooling, drying and granulating to obtain the master batch. Wherein the production temperature of the double-screw extruder is 220 ℃, the rotating speed of the main machine is controlled to be 250r/min, and the rotating speed of the screw is 300 rpm.

Comparative example No. two

The master batch for the polyolefin film described in the comparative example comprises the following components in parts by weight: 5 parts of synthetic silicon dioxide with the average particle size of 3 mu m, 5 parts of long-chain alkyl silicone oil with the viscosity of 150 ten thousand, 5 parts of polytetrafluoroethylene with the molecular weight of 5 ten thousand, 10 parts of homopolymerized polypropylene with the melt index of 7 and 30 parts of ethylene-propylene block copolymer with the melt index of 10.

The preparation method comprises the following steps: and uniformly mixing the weighed raw materials in a high-speed mixer, melting and extruding the mixed materials through a double-screw extruder, cooling, drying and granulating to obtain the master batch, wherein the production temperature of the double-screw extruder is 220 ℃, the rotating speed of a host is controlled at 250r/min, and the rotating speed of a screw is 300 rpm.

The master batches for polyolefin films of the above examples and comparative examples were tested for friction coefficient, temperature resistance, light transmittance, haze and corona attenuation value. 3 parts of master batch for polyolefin films are taken from the examples and the comparative examples respectively, and are respectively mixed with 97 parts of polypropylene to produce a three-layer co-extruded BOPP film with the thickness of 20um, wherein the master batch is added on the surface layer, and the test is carried out according to the following method:

the haze of the film is measured according to the method for measuring the light transmittance and the haze of the transparent plastic GB/T2410.

The film friction coefficient is tested according to the GB/T10006 plastic film and sheet friction coefficient measuring method.

The corona attenuation values of the films were measured according to the method for measuring the surface tension of GB/T4126 plastic films and sheets. The initial corona side was tested for corona value, and the film article was then oven dried continuously at 60 ℃ for 7 days and the final corona value of the corona side after drying was tested. The corona decay value is the initial corona value-the final corona value.

The temperature resistance was tested as follows: the master batch is respectively kept at 200 ℃ for 5min and 280 ℃ for injection sample plate, and the color change is compared by taking the injection sample plate at 200 ℃ as a standard.

The test results are shown in table one.

Watch 1

As can be seen from the table I, the dynamic and static friction coefficients of the examples are better than those of the comparative example, which shows that the examples have excellent opening smooth effect; the high temperature resistance of the several examples is higher than that of the comparative example; the corona decay values of the examples were significantly lower than the comparative examples, indicating that the migration resistance of the examples was significantly higher than the comparative examples; the light transmittance of the examples was higher than that of the comparative example, and the haze was significantly lower than that of the comparative example, indicating that the examples had high transparency.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.