Antistatic wear-resistant release paper and preparation process thereof

Abstract

The invention relates to the technical field of release paper, in particular to antistatic wear-resistant release paper and a preparation process thereof.The antistatic wear-resistant release paper comprises a release agent layer, bottom paper, an adhesive layer, a film layer, an antistatic coating and a wear-resistant coating which are sequentially arranged from bottom to top, and the antistatic coating is formed by coating and curing antistatic paint; and the wear-resistant coating is formed by coating and curing a wear-resistant coating. According to the antistatic wear-resistant release paper disclosed by the invention, the antistatic coating is formed by coating and curing the antistatic coating, so that the antistatic wear-resistant release paper not only has excellent antistatic performance, but also has good transparency and base material adhesion; and the wear-resistant coating formed by coating and curing the wear-resistant paint has excellent hardness and wear resistance, and the light transmission of the coating and the adhesive force of the base material are not reduced, so that the coating can keep good surface roughness for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of release paper, and in particular to an antistatic and wear-resistant release paper and a preparation process thereof. Background Art

[0002] The wide application of release paper in food packaging, disposable medical and sanitary products and daily chemicals has brought convenience to human life. The Chinese invention patent with application number 201510417580.9 discloses a preparation process of high temperature resistant antistatic release paper, which includes the following steps: laminating a layer of laminating layer on one side of the release paper base paper with a laminating machine, then coating a layer of adhesive layer on the other side, coating a layer of high temperature resistant film layer on the surface of the adhesive layer, then applying a layer of antistatic layer on the high temperature resistant film layer and performing corona pretreatment, then coating the release agent on the surface of the electrostatic layer, and finally drying the coated release paper, wherein the high temperature resistant film layer contains a high temperature resistant auxiliary agent and a high temperature resistant reinforcing agent. By adding a high temperature resistant auxiliary agent and a high temperature resistant reinforcing agent, the release paper has a strong high temperature resistance, and at the same time, an antistatic layer is added, so that the release paper not only has a strong high temperature resistance and a strong antistatic ability. Although the patent has general antistatic properties, the wear resistance is poor. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the object of the present invention is to provide an antistatic and wear-resistant release paper and a preparation process thereof.

[0004] The purpose of the present invention is achieved by the following technical scheme: an antistatic wear-resistant release paper, comprising a release agent layer, a base paper, an adhesive layer, a film layer, an antistatic coating and a wear-resistant coating arranged in sequence from bottom to top, wherein the antistatic coating is formed by curing the antistatic coating after coating, and the wear-resistant coating is formed by curing the wear-resistant coating after coating. The release agent layer is a silicone release agent layer, the base paper is glassine paper, the adhesive layer is a water-based acrylic adhesive layer, and the film layer is a PET film with a light transmittance greater than 92% and a haze less than 1%.

[0005] The antistatic wear-resistant release paper of the present invention adopts an antistatic coating formed by curing after coating an antistatic coating, and not only has excellent antistatic performance, but also has good transparency and substrate adhesion; and the wear-resistant coating formed by curing after coating a wear-resistant coating has excellent hardness and wear resistance, and does not reduce the light transmittance and substrate adhesion of the coating, so that the coating can maintain good surface roughness for a long time.

[0006] Preferably, the antistatic coating comprises the following raw materials in parts by weight: 25-45 parts of methyl methacrylate, 15-25 parts of 4-trimethylsilylstyrene, 10-20 parts of polyaspartic acid ester, 5-15 parts of linear polydimethylsiloxane, 5-15 parts of tetraethyl orthosilicate, 2-6 parts of composite antistatic agent, 1-3 parts of initiator, 1-5 parts of other auxiliary agents and 30-50 parts of isopropanol. The antistatic coating of the present invention adopts the above raw materials and strictly controls the weight ratio of each raw material, so that the obtained antistatic coating not only has excellent antistatic performance, but also has good transparency and substrate adhesion.

[0007] Preferably, the composite antistatic agent is a mixture of bis-hydroxyethyl coconut oil methyl ammonium chloride, trihydroxyethyl methyl quaternary ammonium methyl sulfate and sodium dodecyl sulfonate in a weight ratio of 1.5-2.5: 0.5-1.5: 1. The present invention strictly controls the type, compounding and ratio of the composite antistatic agent, so that the obtained antistatic coating has excellent antistatic performance.

[0008] Preferably, the initiator is a mixture of 2-methyl-2-(4-morpholinyl)-1-[4-(methylthio)phenyl]-1-propanone and 1-hydroxycyclohexylphenyl ketone in a weight ratio of 1-2: 1. The present invention can initiate the polymerization reaction at a lower temperature by strictly controlling the type, compounding and ratio of the initiator, thereby increasing the reaction rate and reducing energy consumption.

[0009] Preferably, the other auxiliary agents are a mixture of trimethylsiloxysilicate, mercapto-modified polydimethylsiloxane and polyoxyethylene polyoxypropylene pentaerythritol ether in a weight ratio of 1.5-2.5:1-2:1. The present invention adopts trimethylsiloxysilicate as a dispersant to enhance gloss, increase leveling effect, improve tinting strength, reduce viscosity, reduce flocculation, and increase storage stability. The present invention adopts mercapto-modified polydimethylsiloxane as a leveling agent to effectively reduce the surface tension of the coating, improve its leveling and uniformity, and improve the permeability of the coating. The present invention adopts polyoxyethylene polyoxypropylene pentaerythritol ether as a defoaming agent, which has the characteristics of fast defoaming speed, long anti-foaming time, good effect, good diffusivity, good permeability, good thermal stability, etc.

[0010] Preferably, the wear-resistant coating comprises the following raw materials in parts by weight: 30-50 parts of polyurethane acrylate, 15-25 parts of hydroxyethyl acrylate, 10-20 parts of glycidyl acrylate, 5-15 parts of isobornyl methacrylate, 6-10 parts of modified fluororesin, 10-20 parts of inorganic nanoparticles, 1-3 parts of photoinitiator, 2-6 parts of other additives and 40-60 parts of anhydrous ethanol. The wear-resistant coating of the present invention adopts the above raw materials and strictly controls the weight ratio of each raw material, so that the wear-resistant coating has excellent hardness and wear resistance, and does not reduce the light transmittance and substrate adhesion of the coating, so that the coating can maintain good surface roughness for a long time.

[0011] Preferably, the inorganic nanoparticles are a mixture of nanodiamond, nanotitanium nitride and nanosilicon dioxide in a weight ratio of 1-3:1-2:1. The present invention strictly controls the type, compounding and ratio of inorganic nanoparticles to obtain a wear-resistant coating with excellent hardness and wear resistance, and due to the small particle size of the nanomaterial, the light transmittance of the coating is not reduced.

[0012] Preferably, the initiator is a mixture of 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a weight ratio of 1-2: 1. The present invention can initiate the polymerization reaction at a lower temperature by strictly controlling the type, compounding and ratio of the initiator, thereby increasing the reaction rate and reducing energy consumption.

[0013] Preferably, the other auxiliary agent is a mixture of trimethylsiloxysilicate, polyoxyethylene polyoxypropylene pentaerythritol ether and tripropylene glycol n-butyl ether in a weight ratio of 1-2:0.5-1.5:1. The present invention adopts trimethylsiloxysilicate as a dispersant to improve gloss, increase leveling effect, improve tinting power, reduce viscosity, reduce flocculation, and increase storage stability. The present invention adopts polyoxyethylene polyoxypropylene pentaerythritol ether as a defoaming agent, which has the characteristics of fast defoaming speed, long foam suppression time, good effect, good diffusivity, good permeability, good thermal stability, etc. The present invention adopts tripropylene glycol n-butyl ether as a film-forming auxiliary agent, which has good film-forming properties, compatibility and excellent substrate adhesion.

[0014] Another object of the present invention is achieved by the following technical solution: A process for preparing an antistatic wear-resistant release paper, comprising the following steps:

[0015] (1) Laminating the film layer on the front side of the base paper through the adhesive layer;

[0016] (2) applying a layer of antistatic coating on the surface of the film layer, and forming an antistatic coating after curing;

[0017] (3) applying a layer of wear-resistant coating on the surface of the antistatic coating to form a wear-resistant coating after curing;

[0018] (4) A layer of release agent is coated on the back of the base paper, and a release agent layer is formed after curing to obtain an antistatic and wear-resistant release paper.

[0019] The preparation process of the invention has simple steps, convenient operation and control, stable quality, high production efficiency, low production cost and can be produced on a large scale in an industrial manner.

[0020] The beneficial effects of the present invention are as follows: the antistatic wear-resistant release paper of the present invention adopts an antistatic coating formed by coating and curing an antistatic coating, and not only has excellent antistatic performance, but also has good transparency and substrate adhesion; and the wear-resistant coating formed by coating and curing a wear-resistant coating has excellent hardness and wear resistance, and does not reduce the light transmittance and substrate adhesion of the coating, so that the coating can maintain good surface roughness for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a partial cross-sectional view of the antistatic wear-resistant release paper of the present invention.

[0022] The reference numerals in the drawings are: release agent layer 1, base paper 2, adhesive layer 3, film layer 4, antistatic coating 5, and wear-resistant coating 6. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of those skilled in the art, the following embodiments and attached Figure 1 The present invention is further described, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0024] Example 1

[0025] See Figure 1 , an antistatic wear-resistant release paper, comprising a release agent layer 1, a base paper 2, an adhesive layer 3, a film layer 4, an antistatic coating 5 and a wear-resistant coating 6 arranged in sequence from bottom to top, wherein the antistatic coating 5 is formed by curing the antistatic coating after coating, and the wear-resistant coating 6 is formed by curing the wear-resistant coating after coating. The release agent layer 1 is a silicone release agent layer 1, the base paper 2 is glassine paper, the adhesive layer 3 is a water-based acrylic adhesive layer, and the film layer 4 is a PET film with a light transmittance greater than 92% and a haze less than 1%.

[0026] The antistatic coating comprises the following raw materials in parts by weight: 25 parts of methyl methacrylate, 15 parts of 4-trimethylsilylstyrene, 10 parts of polyaspartic acid ester, 5 parts of linear polydimethylsiloxane, 5 parts of tetraethyl orthosilicate, 2 parts of composite antistatic agent, 1 part of initiator, 1 part of other auxiliary agents and 30 parts of isopropyl alcohol.

[0027] The composite antistatic agent is a mixture of bis-hydroxyethyl coconut oil methyl ammonium chloride, trihydroxyethyl methyl quaternary ammonium methyl sulfate and sodium dodecyl sulfonate in a weight ratio of 1.5:0.5:1.

[0028] The initiator is a mixture of 2-methyl-2-(4-morpholinyl)-1-[4-(methylthio)phenyl]-1-propanone and 1-hydroxycyclohexylphenyl ketone in a weight ratio of 1:1.

[0029] The other auxiliary agent is a mixture of trimethylsiloxysilicate, mercapto-modified polydimethylsiloxane and polyoxyethylene polyoxypropylene pentaerythritol ether in a weight ratio of 1.5:1:1.

[0030] The wear-resistant coating comprises the following raw materials in parts by weight: 30 parts of polyurethane acrylate, 15 parts of hydroxyethyl acrylate, 10 parts of glycidyl acrylate, 5 parts of isobornyl methacrylate, 6 parts of modified fluororesin, 10 parts of inorganic nanoparticles, 1 part of photoinitiator, 2 parts of other additives and 40 parts of anhydrous ethanol.

[0031] The inorganic nanoparticles are a mixture of nanodiamond, nanotitanium nitride and nanosilicon dioxide in a weight ratio of 1:1:1.

[0032] The initiator is a mixture of 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a weight ratio of 1:1.

[0033] The other auxiliary agent is a mixture of trimethylsiloxysilicate, polyoxyethylene polyoxypropylene pentaerythritol ether and tripropylene glycol n-butyl ether in a weight ratio of 1:0.5:1.

[0034] A method for preparing antistatic wear-resistant release paper comprises the following steps:

[0035] (1) Laminating the film layer 4 on the front side of the base paper through the adhesive layer 3;

[0036] (2) coating a layer of antistatic coating on the surface of the film layer 4, and forming an antistatic coating 5 after curing;

[0037] (3) applying a layer of wear-resistant coating on the surface of the antistatic coating 5, and forming a wear-resistant coating 6 after curing;

[0038] (4) A layer of release agent is coated on the back of the base paper 2, and after curing, a release agent layer 1 is formed to obtain an antistatic and wear-resistant release paper.

[0039] Example 2

[0040] The difference between this embodiment and the above-mentioned embodiment 1 is that:

[0041] The antistatic coating comprises the following raw materials in parts by weight: 35 parts of methyl methacrylate, 20 parts of 4-trimethylsilylstyrene, 15 parts of polyaspartic acid ester, 10 parts of linear polydimethylsiloxane, 10 parts of tetraethyl orthosilicate, 4 parts of composite antistatic agent, 2 parts of initiator, 3 parts of other auxiliary agents and 40 parts of isopropyl alcohol.

[0042] The composite antistatic agent is a mixture of bis-hydroxyethyl coconut oil methyl ammonium chloride, trihydroxyethyl methyl quaternary ammonium methyl sulfate and sodium dodecyl sulfonate in a weight ratio of 2:1:1.

[0043] The initiator is a mixture of 2-methyl-2-(4-morpholinyl)-1-[4-(methylthio)phenyl]-1-propanone and 1-hydroxycyclohexylphenyl ketone in a weight ratio of 1.5:1.

[0044] The other auxiliary agent is a mixture of trimethylsiloxysilicate, mercapto-modified polydimethylsiloxane and polyoxyethylene polyoxypropylene pentaerythritol ether in a weight ratio of 2:1.5:1.

[0045] The wear-resistant coating comprises the following raw materials in parts by weight: 40 parts of polyurethane acrylate, 20 parts of hydroxyethyl acrylate, 15 parts of glycidyl acrylate, 10 parts of isobornyl methacrylate, 8 parts of modified fluororesin, 15 parts of inorganic nanoparticles, 2 parts of photoinitiator, 4 parts of other additives and 50 parts of anhydrous ethanol.

[0046] The inorganic nanoparticles are a mixture of nanodiamond, nanotitanium nitride and nanosilicon dioxide in a weight ratio of 2:1.5:1.

[0047] The initiator is a mixture of 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a weight ratio of 1.5:1.

[0048] The other auxiliary agent is a mixture of trimethylsiloxysilicate, polyoxyethylene polyoxypropylene pentaerythritol ether and tripropylene glycol n-butyl ether in a weight ratio of 1.5:1:1.

[0049] Example 3

[0050] The difference between this embodiment and the above-mentioned embodiment 1 is that:

[0051] The antistatic coating comprises the following raw materials in parts by weight: 45 parts of methyl methacrylate, 25 parts of 4-trimethylsilylstyrene, 20 parts of polyaspartic acid ester, 15 parts of linear polydimethylsiloxane, 15 parts of tetraethyl orthosilicate, 6 parts of composite antistatic agent, 3 parts of initiator, 5 parts of other auxiliary agents and 50 parts of isopropyl alcohol.

[0052] The composite antistatic agent is a mixture of bis-hydroxyethyl coconut oil methyl ammonium chloride, trihydroxyethyl methyl quaternary ammonium methyl sulfate and sodium dodecyl sulfonate in a weight ratio of 2.5:1.5:1.

[0053] The initiator is a mixture of 2-methyl-2-(4-morpholinyl)-1-[4-(methylthio)phenyl]-1-propanone and 1-hydroxycyclohexylphenyl ketone in a weight ratio of 2:1.

[0054] The other auxiliary agent is a mixture of trimethylsiloxysilicate, mercapto-modified polydimethylsiloxane and polyoxyethylene polyoxypropylene pentaerythritol ether in a weight ratio of 2.5:2:1.

[0055] The wear-resistant coating comprises the following raw materials in parts by weight: 50 parts of polyurethane acrylate, 25 parts of hydroxyethyl acrylate, 20 parts of glycidyl acrylate, 15 parts of isobornyl methacrylate, 10 parts of modified fluororesin, 20 parts of inorganic nanoparticles, 3 parts of photoinitiator, 6 parts of other additives and 60 parts of anhydrous ethanol.

[0056] The inorganic nanoparticles are a mixture of nanodiamond, nanotitanium nitride and nanosilicon dioxide in a weight ratio of 3:2:1.

[0057] The initiator is a mixture of 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a weight ratio of 2:1.

[0058] The other auxiliary agent is a mixture of trimethylsiloxysilicate, polyoxyethylene polyoxypropylene pentaerythritol ether and tripropylene glycol n-butyl ether in a weight ratio of 2:1.5:1.

[0059] Comparative Example 1

[0060] The difference between this comparative example and Example 2 is that no composite antistatic agent is added.

[0061] Comparative Example 2

[0062] The difference between this comparative example and Example 2 is that no inorganic nanoparticles are added.

[0063] The performance tests of the antistatic coatings obtained in Examples 1-3 and Comparative Examples 1-2 are as follows:

[0064] Test items Test Standards Example 1 Example 2 Example 3 Comparative Example 1 Surface resistance GB / T 1410-2006 <![CDATA[2.3*10 10 Oh]]> <![CDATA[5.6*10 10 Oh]]> <![CDATA[4.5*10 10 Oh]]> <![CDATA[8.7*10 5 Oh]]> Adhesion GB / T 5210-2006 5B 5B 5B 5B Light transmittance GB / T 9754-2007 92.8％ 94.2％ 93.5％ 94.5％

[0065] It can be seen from the above table that the antistatic wear-resistant release paper of the present invention has an antistatic coating formed by curing the antistatic coating after coating, and has not only excellent antistatic performance but also good transparency and substrate adhesion.

[0066] The performance tests of the wear-resistant coatings obtained in Examples 1-3 and Comparative Examples 1-2 are as follows:

[0067] Test items Test Standards Example 1 Example 2 Example 3 Comparative Example 2 Pencil hardness GB / T 6739-2006 9H 9H 9H 5H Wear test GB / T 1768-2006 5000 times 5000 times 5000 times 2000 times Adhesion GB / T 5210-2006 5B 5B 5B 5B Light transmittance GB / T 9754-2007 92.5％ 93.4％ 92.8％ 93.7％

[0068] It can be seen from the above table that the antistatic wear-resistant release paper of the present invention has excellent hardness and wear resistance by adopting a wear-resistant coating formed by curing after coating of a wear-resistant coating, and does not reduce the light transmittance and substrate adhesion of the coating, so that the coating can maintain good surface roughness for a long time.

[0069] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. An antistatic wear-resistant release paper, characterized in that: It includes a release agent layer, a base paper, an adhesive layer, a film layer, an antistatic coating and a wear-resistant coating arranged in sequence from bottom to top. The antistatic coating is formed by curing the antistatic coating after coating, and the wear-resistant coating is formed by curing the wear-resistant coating after coating.

2. The antistatic and wear-resistant release paper according to claim 1, characterized in that: The antistatic coating comprises the following raw materials in parts by weight: 25-45 parts of methyl methacrylate, 15-25 parts of 4-trimethylsilylstyrene, 10-20 parts of polyaspartic acid ester, 5-15 parts of linear polydimethylsiloxane, 5-15 parts of tetraethyl orthosilicate, 2-6 parts of composite antistatic agent, 1-3 parts of initiator, 1-5 parts of other auxiliary agents and 30-50 parts of isopropyl alcohol.

3. The antistatic and wear-resistant release paper according to claim 2, characterized in that: The composite antistatic agent is a mixture of bis-hydroxyethyl coconut oil methyl ammonium chloride, trihydroxyethyl methyl quaternary ammonium methyl sulfate and sodium dodecyl sulfonate in a weight ratio of 1.5-2.5:0.5-1.5:

1.

4. The antistatic and wear-resistant release paper according to claim 2, characterized in that: The initiator is a mixture of 2-methyl-2-(4-morpholinyl)-1-[4-(methylthio)phenyl]-1-propanone and 1-hydroxycyclohexylphenyl ketone in a weight ratio of 1-2:

1.

5. The antistatic and wear-resistant release paper according to claim 2, characterized in that: The other auxiliary agent is a mixture of trimethylsiloxysilicate, mercapto-modified polydimethylsiloxane and polyoxyethylene polyoxypropylene pentaerythritol ether in a weight ratio of 1.5-2.5:1-2:

1.

6. The antistatic and wear-resistant release paper according to claim 1, characterized in that: The wear-resistant coating comprises the following raw materials in parts by weight: 30-50 parts of polyurethane acrylate, 15-25 parts of hydroxyethyl acrylate, 10-20 parts of glycidyl acrylate, 5-15 parts of isobornyl methacrylate, 6-10 parts of modified fluororesin, 10-20 parts of inorganic nanoparticles, 1-3 parts of photoinitiator, 2-6 parts of other additives and 40-60 parts of anhydrous ethanol.

7. The antistatic and wear-resistant release paper according to claim 6, characterized in that: The inorganic nanoparticles are a mixture of nanodiamond, nanotitanium nitride and nanosilicon dioxide in a weight ratio of 1-3:1-2:

1.

8. The antistatic and wear-resistant release paper according to claim 6, characterized in that: The initiator is a mixture of 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a weight ratio of 1-2:

1.

9. The antistatic and wear-resistant release paper according to claim 6, characterized in that: The other auxiliary agent is a mixture of trimethylsiloxysilicate, polyoxyethylene polyoxypropylene pentaerythritol ether and tripropylene glycol n-butyl ether in a weight ratio of 1-2:0.5-1.5:

1.

10. A process for preparing an antistatic wear-resistant release paper according to any one of claims 1 to 9, characterized in that: The steps include: (1) Laminating the film layer on the front side of the base paper through the adhesive layer; (2) applying a layer of antistatic coating on the surface of the film layer, and forming an antistatic coating after curing; (3) applying a layer of wear-resistant coating on the surface of the antistatic coating to form a wear-resistant coating after curing; (4) A layer of release agent is coated on the back of the base paper, and a release agent layer is formed after curing to obtain an antistatic and wear-resistant release paper.

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