CN115746365B

CN115746365B - Direct-pressure grid-shaped release film and preparation method thereof

Info

Publication number: CN115746365B
Application number: CN202211461346.2A
Authority: CN
Inventors: 丁乔宜; 李浩亮; 丁乔芳; 胡鱼贵
Original assignee: Shenzhen Ruihua Coating Technology Co ltd
Current assignee: Shenzhen Ruihua Coating Technology Co ltd
Priority date: 2022-11-17
Filing date: 2022-11-17
Publication date: 2023-08-01
Anticipated expiration: 2042-11-17
Also published as: CN115746365A

Abstract

The application relates to the field of release films, and particularly discloses a direct-pressure grid-shaped release film and a preparation method thereof. The direct-pressure grid-shaped release film product structure comprises a release layer, an antistatic layer and a film layer, wherein on one hand, the antistatic layer is prepared by mixing a conductive polymer material and carbon black, and has an antistatic function and high wear resistance; on the other hand, from type membrane in this application through the bellied net of suppression preparation, effectively reduced the thin film layer and from the area of contact of type layer, make from type membrane have better from the type effect, and net from type membrane and thin film layer pressfitting make gluey have latticly, from type membrane laminating product like this, be difficult for appearing the bubble and detain, have better exhaust effect.

Description

Direct-pressure grid-shaped release film and preparation method thereof

Technical Field

The application relates to the technical field of release films, in particular to a direct-pressure grid-shaped release film and a preparation method thereof.

Background

The release film is a film material with release effect, and along with the continuous development of the field of release materials, various release film products with basic release functions are already stored in the market. In the information age, static electricity is destructive to high-voltage discharge generated by static electricity accumulation of various sensitive elements, instruments and meters and some chemical products such as packaging films, so that an antistatic release film is required, the antistatic effect of the release film is also improved to a certain extent in the prior related art, and release film products with both antistatic property and high wear resistance are required in many technical fields.

Disclosure of Invention

In order to prepare a high-wear-resistance release film with antistatic property, the application provides a direct-pressure grid-shaped release film and a preparation method thereof.

In a first aspect, the application provides a direct-pressure latticed release film, which adopts the following technical scheme:

a direct-pressure latticed release film is formed by coating and pressing a release layer, an antistatic layer and a film layer which are sequentially arranged, wherein the antistatic layer is prepared from the following raw materials, by weight, 100-120 parts of polyphenylacetylene, 12-16 parts of carbon black, 15-30 parts of adhesive resin, 6-10 parts of 1-butyl-3-methylimidazole dodecyl sulfate, 20-22 parts of polyacrylate-benzotriazole block copolymer and 20-40 parts of pure water.

By adopting the technical scheme, the antistatic layer adopts the polyphenylacetylene conductive polymer to be matched with carbon black particles so that the release film has conductivity, and the static electricity generated by stored charges can not occur; the adhesive resin promotes uniform fusion of the conductive polymer and the carbon black; by using the synergism of ionic liquid surfactant 1-butyl-3-methylimidazole dodecyl sulfate and polyacrylate-benzotriazole block copolymer, the large pi electron cloud of imidazole cations and carbon black in the ionic liquid surfactant 1-butyl-3-methylimidazole dodecyl sulfate can generate stronger acting force to promote the orderly arrangement of carbon materials in ionic liquid, so that the carbon materials are compatible and dispersed with an ionic liquid surfactant system. The carbon black is infiltrated and compatible with the ionic liquid type surfactant, is added into pure water for large-scale dispersion, and is mixed with the polyacrylate-benzotriazole block copolymer after higher dispersity is obtained, so that the carbon black can be more uniformly anchored by the polyacrylate-benzotriazole block copolymer, the dispersibility of the carbon black in a matrix is improved, the release film is enabled to obtain good conductivity, and the antistatic effect is further optimized; meanwhile, the treatment of the polyacrylate-benzotriazole block copolymer reduces the fluid viscosity of the carbon black, so that the overall viscosity of the antistatic layer of the release film is reduced, and the antistatic layer is favorable for better coating on the film layer of the release film.

Preferably, the preparation method of the polyacrylate-benzotriazole block copolymer comprises the following steps: 35-40g of benzyl methacrylate monomer, 18-22g of polybenzotriazole, 8-10g of dimethylaminoethyl acrylate monomer, 1-2g of initiator alpha-chloroisobutyric acid, 0.3-0.5g of copper bromide and 0.5-0.6g of pentamethyldiethylenetriamine are added, 8-10ml of acetone is added, the mixture is uniformly mixed, and then the mixture is vacuumized, filled with nitrogen and stirred for 60-80min at 85-90 ℃.

By adopting the technical scheme, one end of the monomer can be adsorbed on the surface of the dispersed carbon black particles, and the other end of the monomer is dissolved in the dispersed medium to be copolymerized, so that a three-dimensional space barrier is formed, and flocculation of the particles is prevented; and a plurality of adsorption points are introduced into each dispersant molecule, so that the adsorption capacity is excellent, and the carbon black particles can be uniformly anchored on the surfaces of the carbon black particles.

Preferably, the carbon black comprises the following components in percentage by mass: 2-6 parts of carbon black A with the particle size of 80-100 meshes and 10-14 parts of nano carbon black with the particle size of 300-350 meshes.

By adopting the technical scheme, the carbon black presents good dispersibility in the polyphenylacetylene through adjusting the grading, and the nano carbon black has good conductivity, so that the conductivity of a polyphenylacetylene material system is further improved when the nano carbon black is uniformly dispersed in the system, the antistatic performance of the material is optimized, the carbon black A and the nano carbon black B form a framework structure with small surrounding and large size, the structure determines the function, and the abrasion resistance is greatly improved when the carbon black framework realizes the antistatic function.

Preferably, the preparation method of the 1-butyl-3-methylimidazole dodecyl sulfate comprises the steps of mixing, by weight, 10-20 parts of 1-butyl-3-methylimidazole chlorine, 4-8 parts of sodium dodecyl sulfate and 20-40 parts of dichloromethane solvent, stirring at room temperature for 3-5 hours, filtering, taking clear liquid, and washing with clear water until the clear liquid is colorless, thus obtaining the 1-butyl-3-methylimidazole dodecyl sulfate.

Preferably, the binder resin is one or more of polyacrylic, polyurethane, epoxy, polyester, vinyl resin, and amide resin.

By adopting the technical scheme, the adhesive resin promotes the uniform fusion of the conductive polymer and the carbon black, improves the compatibility between materials, and after the adhesive resin is added, the carbon black is in a state that a plurality of polymers exist, and the carbon black in the state can realize higher conductive effect under the condition of reducing the dosage, thereby saving natural resources.

Preferably, the film layer is prepared from the following raw materials in parts by weight, 90-150 parts of PET and 10-30 parts of PPENSK.

By adopting the technical scheme, the special plastic PPENSK added with high performance is used, so that the PPENSK molecular twisting structure has strong acting force, good strength and good heat resistance, and the polyester film material with high strength, fatigue resistance and long service life can be obtained.

Preferably, the release layer is an adhesion layer composed of simethicone and a coupling agent KH 550.

In a second aspect, the present application provides a method for preparing a direct-pressure latticed release film, which adopts the following technical scheme: s1, preparing a film layer;

s2, coating an electrostatic layer: uniformly mixing carbon black with 1-butyl-3-methylimidazole dodecyl sulfate and pure water, adding polyacrylate-benzotriazole block copolymer, stirring until uniform mixing, finally adding polyphenylacetylene and adhesive resin into a stirrer, uniformly mixing to obtain an antistatic layer mixture, and coating the mixture above a film layer;

s3, coating a release layer, namely coating the release layer on the antistatic layer;

and S4, embossing the mesh patterns, and rolling to obtain a finished product.

Through adopting above-mentioned technical scheme, through carrying out latticed impressed watermark, effectively reduced the product and from the area of contact of type membrane, make from the type membrane have better from the type effect, and have better exhaust effect when laminating the product from the type membrane.

Preferably, the film layer is prepared from the following raw materials in parts by weight, 90-150 parts of PET and 10-30 parts of PPENSK, and specifically comprises the following steps:

s1-1, putting PET and PPENSK into an organic solvent NMP for mixed dissolution, volatilizing the NMP to separate out the required PET and PPENSK mixed raw materials, and washing with pure water to obtain the PET and PPENSK mixed raw materials.

S1-2, drying the PET and PPENSK mixed raw materials in parallel, extruding and quenching the PET and PPENSK mixed raw materials after the PET and PPENSK mixed raw materials are uniformly extruded, and then performing longitudinal and transverse stretching to heat setting on the PET and PPENSK mixed raw materials to obtain the required film layer.

Preferably, the release layer is an adhesion layer composed of simethicone and a coupling agent KH550, and the specific operation of step S3 is as follows: the simethicone and the coupling agent KH550 are mixed and then coated on the antistatic layer, and then dried. And finally, the net is embossed, and the finished product is obtained after rolling.

In summary, the present application has the following beneficial effects:

1. the method adopts the polyphenylacetylene polymer containing the graded carbon black, and the graded carbon black is regulated to ensure that the carbon black presents good dispersibility in the polyphenylacetylene, and the carbon black has good conductivity, so that the conductivity of the polyphenylacetylene material system is further improved when the carbon black is uniformly dispersed in the system, and the antistatic property of the material is optimized; simultaneously, carbon black plays an anti-adhesion role of the antistatic layer and other functional layers, and the surface strength of the release film is increased, so that the abrasion-resistant effect of the release film is improved.

2. The application adopts the 1-butyl-3-methylimidazole dodecyl sulfate and polyacrylate-benzotriazole block copolymer to synergistically promote the dispersion of the carbon material in the matrix; firstly, carbon black and an ionic liquid type surfactant are compatible and dispersed, the carbon black is added into pure water for dispersion, the higher dispersity enables the carbon black to be uniformly anchored by a polyacrylate-benzotriazole segmented copolymer, the dispersibility of the carbon black in a matrix is improved, the viscosity of carbon black fluid can be reduced after the carbon black is anchored, the dispersibility of the carbon black is maintained, the overall viscosity of a release film antistatic layer is further reduced, and the carbon black is favorably coated on a release film layer.

3. The mesh embossing is preferably adopted in the application, and the contact area of the film layer and the release layer is effectively reduced due to the mesh embossing, so that the release film has a better release effect, and the mesh release film and the film layer are pressed to enable the adhesive to have a mesh shape, so that the release film has a better exhaust effect when being attached to a product.

Detailed Description

The present application is further described in detail with reference to the following examples, which are specifically described: the following examples, in which no specific conditions are noted, are conducted under conventional conditions or conditions recommended by the manufacturer, and the raw materials used in the following examples are commercially available from ordinary sources except for the specific descriptions.

Preparation examples 1 to 3 are preparation examples of 1-butyl-3-methylimidazole dodecyl sulfate, and preparation examples 4 to 6 are preparation examples of polyacrylate-benzotriazole block copolymer.

Preparation example 1

The preparation method of the 1-butyl-3-methylimidazole dodecyl sulfate comprises the steps of mixing 10g of 1-butyl-3-methylimidazole chloride, 4g of sodium dodecyl sulfate and 20g of methylene dichloride solvent, stirring for 3 hours at room temperature, filtering, taking clear liquid, and washing with clear water to be colorless to obtain the 1-butyl-3-methylimidazole dodecyl sulfate.

Preparation example 2

The preparation method of the 1-butyl-3-methylimidazole dodecyl sulfate comprises the steps of mixing 15g of 1-butyl-3-methylimidazole chloride, 6g of sodium dodecyl sulfate and 30g of methylene dichloride solvent, stirring for 4 hours at room temperature, filtering, taking clear liquid, and washing with clear water to be colorless to obtain the 1-butyl-3-methylimidazole dodecyl sulfate.

Preparation example 3

The preparation method of the 1-butyl-3-methylimidazole dodecyl sulfate comprises the steps of mixing 20g of 1-butyl-3-methylimidazole chlorine, 8g of sodium dodecyl sulfate and 40g of methylene dichloride solvent, stirring for 5 hours at room temperature, filtering, taking clear liquid, and washing with clear water until the clear liquid is colorless, thus obtaining the 1-butyl-3-methylimidazole dodecyl sulfate.

Preparation example 4

The preparation method of the polyacrylate-benzotriazole block copolymer comprises the following steps:

35g of benzyl methacrylate monomer, 18g of polybenzotriazole, 8g of dimethylaminoethyl acrylate monomer, 1g of initiator alpha-chloroisobutyric acid, 0.3 g of copper bromide and 0.5g of pentamethyldiethylenetriamine are added, 8ml of acetone is added and uniformly mixed, and then the mixture is vacuumized, filled with nitrogen and stirred for 80 minutes at 85 ℃.

Preparation example 5

The preparation method of the polyacrylate-benzotriazole block copolymer comprises the following steps: 37g of benzyl methacrylate monomer, 20g of polybenzotriazole, 9g of dimethylaminoethyl acrylate monomer, 1.5g of initiator alpha-chloroisobutyric acid, 0.4g of copper bromide and 0.55g of pentamethyldiethylenetriamine are added, 9ml of acetone is added and uniformly mixed, and then the mixture is vacuumized, filled with nitrogen gas and stirred for 70 minutes at 87 ℃.

Preparation example 6

The preparation method of the polyacrylate-benzotriazole block copolymer comprises the following steps: 40g of benzyl methacrylate monomer, 22g of polybenzotriazole, 10g of dimethylaminoethyl acrylate monomer, 2g of initiator alpha-chloroisobutyric acid, 0.5g of copper bromide and 0.6g of pentamethyldiethylenetriamine are added, 10ml of acetone is added and uniformly mixed, and then the mixture is vacuumized, filled with nitrogen and stirred for 60 minutes at 90 ℃.

Examples

Example 1

S1, preparing a film layer:

s1-1, adding 10g portions of PET 90g and PPENSK into NMP serving as an organic solvent, mixing and dissolving, volatilizing the NMP solvent to separate out required PET and PPENSK mixed raw materials, and washing with pure water to obtain the PET and PPENSK mixed raw materials.

S1-2, firstly drying the mixed raw materials, extruding an amorphous thick sheet through a T-shaped die at 270 ℃ in an extruder, quenching through a cooling drum or cooling liquid to keep the amorphous state so as to stretch and orient, biaxially stretching the thick sheet through a tenter to form an initial film, and longitudinally stretching to preheat the thick sheet to 86 ℃ and stretching the thick sheet for about 3 times along the plane extending direction of the thick sheet at the temperature so as to orient the thick sheet to improve the crystallinity to reach a higher temperature: the transverse stretching preheating temperature is 98 ℃, the stretching temperature is 100 ℃, the stretching ratio is 2.5, and the heat setting temperature is 230 ℃. The film after longitudinal and transverse stretching is also required to be subjected to heat setting to prepare the film with better heat stability.

S2, adding an antistatic layer: adding an antistatic layer: firstly, uniformly mixing 12g of carbon black with 6g of 1-butyl-3-methylimidazole dodecyl sulfate and 20g of pure water prepared in preparation example 1, then adding 20g of polyacrylate-benzotriazole block copolymer prepared in preparation example 4, stirring, drying the water after uniform mixing, finally adding 100g of polyacetylene and 15g of polyacrylic acid binding resin into a stirrer, uniformly mixing, and coating the mixture on the film layer.

S3, mixing 100g of simethicone and 550 g of coupling agent KH, coating on the antistatic layer by adopting a roll coating mode, and drying in a drying tunnel at 80 ℃ for 1 minute.

And S4, embossing the mesh patterns, and rolling to obtain a finished product.

Example 2

The preparation method of the direct-pressure network-shaped release film comprises the following steps:

s1, preparing a film layer:

s1-1, adding 120g of PET and 20g of PPENSK into NMP, mixing and dissolving, volatilizing the NMP solvent to separate out the required PET and PPENSK mixed raw materials, and washing with pure water to obtain the PET and PPENSK mixed raw materials.

S1-2, firstly drying the mixed raw materials, extruding an amorphous thick sheet in an extruder at 280 ℃ through a T-shaped die, quenching through a cooling drum or cooling liquid to keep the amorphous form so as to stretch and orient, biaxially stretching the thick sheet through a tenter to form an initial film, and longitudinally stretching to preheat the thick sheet to 86.5 ℃ and stretching the thick sheet for about 3 times along the extending direction of the plane of the thick sheet at the temperature so as to orient the thick sheet to improve the crystallinity to reach a higher temperature: the transverse stretching preheating temperature is 99 ℃, the stretching temperature is 110 ℃, the stretching ratio is 3.25, and the heat setting temperature is 235 ℃. The film after longitudinal and transverse stretching is also required to be subjected to heat setting to prepare the film with better heat stability.

S2, preparing an antistatic layer: 13g of carbon black, 8g of 1-butyl-3-methylimidazole dodecyl sulfate prepared in preparation example 2 and 30g of pure water are uniformly mixed, 21g of polyacrylate-benzotriazole block copolymer prepared in preparation example 5 is added, stirring is carried out, moisture is dried after uniform mixing, and finally 110g of polyacetylene and 23g of polyacrylic acid binding resin are added into a stirrer to be uniformly mixed and coated on the film layer.

And S4, embossing the mesh patterns, and rolling to obtain a finished product.

Example 3

S1, preparing a film layer:

s1-1, placing 150g of PET and 30g of PPENSK into NMP, mixing and dissolving, volatilizing NMP solvent, separating out required PET and PPENSK mixed raw materials, and washing with pure water to obtain the PET and PPENSK mixed raw materials.

S1-2, firstly drying the mixed raw materials, extruding an amorphous thick sheet in an extruder at 290 ℃ through a T-shaped die, quenching through a cooling drum or cooling liquid to keep the amorphous state so as to stretch and orient, biaxially stretching the thick sheet through a tenter to form an initial film, and longitudinally stretching to preheat the thick sheet to 87 ℃ and stretching the thick sheet for about 3 times along the plane extending direction of the thick sheet at the temperature so as to orient the thick sheet to improve the crystallinity to reach a higher temperature: the transverse stretching preheating temperature is 100 ℃, the stretching temperature is 120 ℃, the stretching ratio is 4.0, and the heat setting temperature is 240 ℃. The film after longitudinal and transverse stretching is also required to be subjected to heat setting to prepare the film with better heat stability.

S2, adding an antistatic layer: firstly, uniformly mixing 16g of carbon black with 10g of 1-butyl-3-methylimidazole dodecyl sulfate and 40g of pure water prepared in preparation example 3, then adding 22g of polyacrylate-benzotriazole block copolymer prepared in preparation example 6, stirring until uniform mixing, finally, adding 120g of polyphenylacetylene and 30g of polyacrylic acid binding resin into a stirrer, uniformly mixing, and coating on the film layer.

And S4, embossing the mesh patterns, and rolling to obtain a finished product.

Example 4

A preparation method of a direct-pressure grid-shaped release film is carried out according to the method of the embodiment 1, and is different in that 326-mesh carbon black is adopted as carbon black in the step S2.

Example 5

A preparation method of a direct-pressure grid-shaped release film is carried out according to the method of the embodiment 1, and is different in that all carbon black in the step S2 adopts 100 meshes of carbon black.

Comparative example

Comparative example 1

A method for preparing a direct pressure grid-like release film was carried out as in example 1, except that the antistatic layer in step S2 was not coated.

Comparative example 2

A preparation method of a direct-pressure latticed release film is carried out according to the method of the embodiment 1, wherein the carbon black in the step S2 is replaced by polyphenylacetylene in an equivalent amount.

Comparative example 3

A preparation method of a direct-pressure latticed release film is carried out according to the method of example 1, except that 1-butyl-3-methylimidazole dodecyl sulfate in the step S2 is replaced by polyacrylate-benzotriazole block copolymer in equal amount.

Comparative example 4

A preparation method of a direct-pressure latticed release film is carried out according to the method of example 1, except that the polyacrylate-benzotriazole block copolymer in the step S2 is replaced by 1-butyl-3-methylimidazole dodecyl sulfate in an equivalent amount.

Comparative example 5

A preparation method of a direct-pressure latticed release film is carried out according to the method of example 1, except that 1-butyl-3-methylimidazole dodecyl sulfate and polyacrylate-benzotriazole block copolymer are not added in step S2.

Comparative example 6

The preparation method of the direct-pressure latticed release film is carried out according to the method of the embodiment 1, and is different in that the polyacrylate-benzotriazole block copolymer in the step S2 is replaced by a polyacrylate block copolymer in an equivalent amount, and the preparation method of the polyacrylate block copolymer is as follows: 50g of BNMA monomer, 20g of EHA monomer, 10g of DMAEA monomer, 2g of initiator alpha-chloroisobutyric acid, 0.6g of copper bromide and 0.8g of PMDETA are added with 15g of acetone, uniformly mixed, then vacuumized, filled with nitrogen and stirred for 60min at 90 ℃.

Comparative example 7

A preparation method of a direct-pressure grid-shaped release film is carried out according to the method of the embodiment 1, and is different in that the release film in the step S4 is a release film pressed into a horizontal layer.

Performance test

1. Antistatic property

2. Wear resistance

1. Antistatic properties:

the surface resistance of the samples was measured according to HG/T3008-1999 standard by placing them in a high insulation leakage current measuring instrument (Beijing rap electronics factory RP 2680) at 20-25 ℃ and humidity 50+ -5% RH.

2. Abrasion resistance test:

according to GB/T1768, a JM-IV abrasion tester (manufactured by Shanghai modern environmental engineering Co., ltd.) was used, a CS17# grinding wheel was selected, a load of 750g was used, 1000 revolutions was set, and the abrasion resistance of the sample was tested at 67 rpm. The weight loss after grinding before and after grinding was then tested: Δw (mg) =w0 (before milling, mg) -W1 (after milling, mg) and is judged according to the following criteria: wear weight loss and wear resistance evaluation

Grade	Weightlessness	Wear resistance
			I	<25	Excellent in
II	Not less than 25 and<75	good (good)
			III	More than or equal to 75 and less than or equal to 100	Acceptable for
IV	>100 difference of	Unacceptable

Example performance test results are shown in table 1 below:

table 1:

	example 1	Example 2	Example 3	Example 4	Example 5
						Surface resistance/Ω	3.42*104	2.94*104	3.99*104	5.64*104	5.71*105
Weight loss on wear/mg	26.66	24.57	24.89	32.49	50.95

Comparative example performance test results are shown in table 2 below:

table 2:

in combination with the test results of example 1 and comparative example 1, it can be seen that the release film added with the antistatic layer has smaller surface resistance and better conductivity.

In combination with the test results of example 1 and comparative example 2, it can be seen that the release film with carbon black added to the antistatic layer has smaller surface resistance and better conductivity.

In combination with the test results of example 1 and comparative example 3, it can be seen that when the antistatic layer is added with carbon black, the conductive effect of the release film using different gradations is different, and when a structure with a small surrounding area and a large surrounding area is formed between carbon black particles, the antistatic layer has smaller surface resistance and better conductivity, so that the antistatic performance of the carbon black gradation in the application is better.

As can be seen from the detection results of examples 1, 4 and 5, when carbon black is added to the antistatic layer, the conductive effect of the release film with different gradations is different, and when a structure with small surrounding area and large surrounding area is formed between carbon black particles, the antistatic layer has smaller surface resistance and better conductivity than the single use of large particle size and small particle size, so that the antistatic performance of the carbon black gradation with different particle sizes is better; in appearance, the graded carbon black is more uniformly coated on the surface than the carbon black with large particle diameter; wear resistance is also relatively best.

By combining the detection results of example 1 and comparative example 2, it can be seen that when no carbon black is added, the antistatic ability of the release film is significantly reduced, and the abrasion resistance is significantly reduced.

By combining the detection results of example 1 and comparative example 3, it can be seen that when 1-butyl-3-methylimidazole dodecyl sulfate is replaced by polyacrylate-benzotriazole block copolymer in equal amount, that is, 1-butyl-3-methylimidazole dodecyl sulfate is not added, the dispersion degree of carbon black is insufficient, the anchoring effect is general, the uniform conductivity is not improved greatly due to insufficient dispersion, the uniformity of surface coating is not good, and the abrasion resistance is not improved greatly;

from the results of the test in example 1 and comparative example 4, it can be seen that the equivalent substitution of the polyacrylate-benzotriazole block copolymer with 1-butyl-3-methylimidazole dodecyl sulfate, that is, without the addition of the polyacrylate-benzotriazole block copolymer, has a general dispersion effect, and the viscosity of the carbon black-containing fluid is higher, the coating efficiency is lower, and the uniformity is poor;

from the results of the test in example 1 and comparative example 5, it was found that, when 1-butyl-3-methylimidazole dodecyl sulfate and polyacrylate-benzotriazole block copolymer were not added, carbon black was hard to disperse due to coagulation, and the antistatic layer was reduced in conductivity, and the release film was insufficient in abrasion resistance, uneven in surface of the antistatic layer, and poor in coating effect.

When the polyacrylate-benzotriazole block copolymer is replaced with the polyacrylate block copolymer in equal amount by combining the detection results of example 1 and comparative example 6, the anchoring effect is generally inferior to that of the polyacrylate-benzotriazole block copolymer with double anchoring sites due to the single anchoring site, so that the abrasion resistance and antistatic property are inferior to those of the release film added with the polyacrylate-benzotriazole block copolymer.

By combining the detection results of the embodiment 1 and the comparative example 7, it can be seen that the raised grids are pressed, so that the contact area between the film layer and the release layer is effectively reduced, and compared with the release film, the release film has better release effect; in appearance, bubbles are more likely to stay when the horizontal release film is attached to the product; and test data show that the grid-shaped release film is more wear-resistant.

The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.

Claims

1. The direct-pressure grid-shaped release film is formed by sequentially arranging and pressing a release layer, an antistatic layer and a film layer, and is characterized in that the antistatic layer is prepared from the following raw materials, by weight, 100-120 parts of polyphenylacetylene, 12-16 parts of carbon black, 15-30 parts of adhesive resin, 6-10 parts of 1-butyl-3-methylimidazole dodecyl sulfate, 20-22 parts of polyacrylate-benzotriazole block copolymer and 20-40 parts of pure water.

2. A direct compression latticed release film according to claim 1, wherein: the preparation method of the polyacrylate-benzotriazole block copolymer comprises the following steps: according to parts by weight, 35-40 parts of benzyl methacrylate monomer, 18-22 parts of polybenzotriazole, 8-10 parts of dimethylaminoethyl acrylate monomer, 1-2 parts of initiator alpha-chloroisobutyric acid, 0.3-0.5 part of copper bromide and 0.5-0.6 part of pentamethyldiethylenetriamine are added, 8-10 parts of acetone are added, uniformly mixed, and then the mixture is vacuumized, filled with nitrogen and stirred for 60-80min at 85-90 ℃.

3. A direct compression latticed release film according to claim 1, wherein: the carbon black comprises the following components in percentage by mass: 2-6 parts of carbon black A with the particle size of 80-100 meshes and 10-14 parts of nano carbon black with the particle size of 300-350 meshes.

4. A direct compression latticed release film according to claim 1, wherein: the preparation method of the 1-butyl-3-methylimidazole dodecyl sulfate comprises the steps of mixing, by weight, 10-20 parts of 1-butyl-3-methylimidazole chlorine, 4-8 parts of sodium dodecyl sulfate and 20-40 parts of dichloromethane solvent, stirring at room temperature for 3-5 hours, filtering, taking clear liquid, and washing with clear water until the clear liquid is colorless, thus obtaining the 1-butyl-3-methylimidazole dodecyl sulfate.

5. A direct compression latticed release film according to claim 1, wherein: the adhesive resin is one or more of polyacrylic acid, polyurethane, epoxy, polyester, vinyl resin and amide resin.

6. A direct compression latticed release film according to claim 1, wherein: the film layer is prepared from the following raw materials in parts by weight, 90-150 parts of PET and 10-30 parts of PPENSK.

7. A direct compression latticed release film according to claim 1, wherein: the release layer is an adhesion layer composed of simethicone and a coupling agent KH 550.

8. A method for preparing a direct-pressure latticed release film according to claim 1, wherein the method comprises the steps of S1, preparing a film layer;

and S4, embossing the mesh patterns, and rolling to obtain a finished product.

9. The method for preparing the direct-pressure latticed release film according to claim 8, wherein the method comprises the following steps: the film layer is prepared from the following raw materials in parts by weight, 90-150 parts of PET (polyethylene terephthalate) and 10-30 parts of PPENSK, wherein the specific operation of the step S1 is as follows:

s1-1, putting PET and PPENSK into an organic solvent NMP for mixed dissolution, volatilizing NMP to separate out required PET and PPENSK mixed raw materials, washing with pure water to obtain the PET and PPENSK mixed raw materials,

s1-2, drying the PET and PPENSK mixed raw material, extruding and quenching the PET and PPENSK mixed raw material after the PET and PPENSK mixed raw material are uniform, and then performing longitudinal and transverse stretching to heat setting on the PET and PPENSK mixed raw material to obtain the required film layer.

10. The method for preparing the direct-pressure latticed release film according to claim 8, wherein the method comprises the following steps: the release layer is an adhesion layer composed of simethicone and a coupling agent KH550, and the specific operation of coating the release layer is as follows: and mixing simethicone and a coupling agent KH550, coating the mixture on the antistatic layer, and drying to obtain the release layer.