Peelable glass protective film and preparation method thereof

Abstract

The invention provides a peelable glass protective film and a preparation method thereof, and belongs to the technical field of deep processing of glass. Comprising the following components in parts by weight: 57-60 parts of chlorinated polyethylene, 3-4 parts of a plasticizer, 27-30 parts of a solvent, 2-3 parts of a flatting agent, 1-2 parts of an anti-settling agent, 1-2 parts of a preservative and 4-5 parts of filler, wherein the plasticizer is dioctyl phthalate, or cyclohexane dicarboxylate, or tributyl citrate, or epoxidized soybean oil; the solvent is butyl acetate or propylene glycol monomethyl ether or methylbenzene or xylene; the flatting agent is polyether modified polydimethylsiloxane or acrylic ester; the anti-settling agent is nano silicon dioxide or polyamide wax; the preservative is sodium benzoate or potassium sorbate; and the filler is polyethylene wax micro powder or titanium dioxide or talcum powder. The glass has the advantages of being fast in film forming, easy to peel, good in scratch resistance and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of glass deep processing, and in particular relates to a peelable glass protective film and a preparation method thereof. Background Art

[0002] In the prior art, after the glass is processed, a film laminating machine is usually required to attach a PVC electrostatic film to its surface to protect its outer surface and prevent it from being polluted by the environment, bumped and scratched during transportation and storage at construction sites. However, the fit between the traditional PVC protective film and the glass surface is not ideal, and bubbles or gaps are prone to appear. In addition, its UV resistance is poor, and it will gradually lose its toughness and become fragile in a short period of time. Furthermore, the physical properties of the traditional PVC protective film are average and its hardness is low, so the glass surface is still prone to scratches under its protection. In addition, the traditional PVC protective film is easy to precipitate oily components at high temperatures and remain on the glass surface, which requires cleaning of the surface to remove the oily components when the glass product is subsequently processed. Summary of the invention

[0003] The purpose of the present invention is to provide a peelable glass protective film and a preparation method thereof in view of the above-mentioned problems existing in the prior art, so that it can be attached to the glass surface to protect the glass product and can be easily peeled off and removed when necessary.

[0004] The object of the present invention can be achieved by the following technical scheme: a peelable glass protective film, characterized in that the protective film comprises the following components in parts by weight: 57-60 parts of chlorinated polyethylene, 3-4 parts of plasticizer, 27-30 parts of solvent, 2-3 parts of leveling agent, 1-2 parts of anti-precipitation agent, 1-2 parts of preservative and 4-5 parts of filler; wherein the plasticizer is dioctyl phthalate or cyclohexane dicarboxylate or tributyl citrate or epoxy soybean oil; the solvent is butyl acetate or propylene glycol methyl ether or toluene or xylene; the leveling agent is polyether modified polydimethylsiloxane or acrylate; the anti-precipitation agent is nano silicon dioxide or polyamide wax; the preservative is sodium benzoate or potassium sorbate; the filler is polyethylene wax micropowder or titanium dioxide or talc.

[0005] A method for preparing a peelable glass protective film, characterized in that the method comprises the following steps:

[0006] S1. Before using the reaction stirred tank, the inner wall of the reactor must be cleaned with anhydrous ethanol for at least 2 times. The waste liquid generated by the cleaning must be poured into a special waste liquid barrel for recycling;

[0007] S2. Weigh the chlorinated polyethylene and the solvent according to the components, put them into a reaction kettle and stir for 20 to 30 minutes, and control the stirring rate to 80 to 110 r / min to fully dissolve the chlorinated polyethylene in the solvent; then weigh the plasticizer according to the components and add it into the reaction kettle, and adjust the stirring rate to 100 to 120 r / min, and stir for 15 to 25 minutes. During this process, the plasticizer and the chlorinated polyvinyl chloride undergo a polymerization reaction to form a multi-branched high molecular polymer;

[0008] S3. Start the reactor and set the temperature. When the reactor is heated to 45-53°C, adjust the stirring rate to 150-180 r / min, weigh the filler according to the component, and gradually add it to the reactor, and keep stirring for 30-45 minutes until the filler is completely dispersed in the solution without particles;

[0009] S4. Weigh the leveling agent and anti-precipitation agent according to the components and heat them in a reactor. Adjust the temperature of the reactor to 55-63°C, adjust the stirring rate to 170-210 r / min, and stir for 20-30 minutes.

[0010] S5: Turn off the heating of the reactor and turn on the cooling circulating water to cool the reactor. After the temperature inside the reactor drops to 20-25°C, weigh the preservatives according to the components and add them into the reactor. Adjust the stirring speed to 60-80r / min and stir for 45-50 minutes to mix all the components evenly under low-speed stirring to obtain a film-forming material.

[0011] S6: Put the film-forming material obtained in S5 into a clean plastic barrel, seal it and store it for later use. It must be ensured that water vapor in the air does not easily enter the material to avoid failure. The plastic barrel must be brown and prevent light from irradiating the protective liquid to make it solidify slowly.

[0012] S7: Use a roller coater to evenly roll the film-forming material onto the glass surface, ensuring that the film thickness ranges from 20 to 30 um; then send the rolled glass into a curing furnace for curing to form a peelable protective layer on the glass surface. The curing furnace temperature is set at 50 to 70°C, and the curing time is 5 to 10 minutes.

[0013] This method has the advantages:

[0014] The peelable protective film coating is mainly made of chlorinated polyethylene, which is a polymer material made from high-density polyethylene through a chlorination reaction. The chemical structure contains chlorine elements, which makes it have good flame retardancy, excellent heat resistance and chemical resistance. It is cured by roller coating or spraying and heating to form a film. The coating forms a continuous, evenly attached and tough protective coating on the glass surface. After curing into a film, it is easy to peel off the glass as a whole without temperature requirements. After peeling off, there is no need to clean the glass surface with water or solvents. In addition, the peelable protective film coating has a waterproof function and a service life of 2 years. The film layer does not change color or become brittle and fall off. DETAILED DESCRIPTION

[0015] The present invention is described in detail below.

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] Example 1

[0018] The present embodiment provides a peelable glass protective film, comprising the following components in parts by weight: 57-60 parts of chlorinated polyethylene, 3-4 parts of plasticizer, 27-30 parts of solvent, 2-3 parts of leveling agent, 1-2 parts of anti-precipitation agent, 1-2 parts of preservative and 4-5 parts of filler; wherein the plasticizer is dioctyl phthalate or cyclohexane dicarboxylate or tributyl citrate or epoxy soybean oil; the solvent is butyl acetate or propylene glycol methyl ether or toluene or xylene; the leveling agent is polyether modified polydimethylsiloxane or acrylate; the anti-precipitation agent is nano-silica or polyamide wax; the preservative is sodium benzoate or potassium sorbate; the filler is polyethylene wax powder or titanium dioxide or talc.

[0019] This protective film uses chlorinated polyethylene as the main film-forming material to form a protective film that is easy to remove from the glass surface. The protective film has both rigidity and toughness, so that when the protective film is peeled off later, it will not break into small pieces, making the peeling operation more convenient. At the same time, since this protective film has a certain rigidity and it uses polyethylene wax micropowder or titanium dioxide or talcum powder as filler, the surface of the film layer is smoother, thereby improving its scratch resistance to better protect the glass. This protective film uses butyl acetate or propylene glycol methyl ether as a solvent. These solvents are highly volatile organic solvents, so that the protective film layer can evaporate quickly after roller coating, thereby shortening the film forming time and improving production efficiency. More importantly, compared with traditional PVC protective film, the plasticizer of this protective film reacts with chlorinated polyvinyl chloride at 50-70°C to form a multi-branched high molecular polymer, which improves the strippability of the material and the density and rigidity of the film. Moreover, because the plasticizer reacts with the main body to form a chemical bond, it is not easy to separate from the main body, and the chemical bond is not easy to break at high temperature, and will not migrate out of the main body. Therefore, there will be no precipitation of plasticizer and oil in this protective film in the later stage, and there will be no residue after peeling. Therefore, in the subsequent processing of the glass, we only need to remove the protective film from the glass, and there is no need to clean the glass again.

[0020] Example 2

[0021] This embodiment provides a method for preparing a peelable glass protective film, comprising the following steps:

[0022] S1. Before using the reaction stirred tank, the inner wall of the reactor must be cleaned with anhydrous ethanol for at least 2 times. The waste liquid generated by the cleaning must be poured into a special waste liquid barrel for recycling;

[0023] S2. Weigh the chlorinated polyethylene and the solvent according to the components, put them into a reaction kettle and stir for 20 to 30 minutes, and control the stirring rate to 80 to 110 r / min to fully dissolve the chlorinated polyethylene in the solvent; then weigh the plasticizer according to the components and add it into the reaction kettle, and adjust the stirring rate to 100 to 120 r / min, and stir for 15 to 25 minutes. During this process, the plasticizer and the chlorinated polyvinyl chloride undergo a polymerization reaction to form a multi-branched high molecular polymer;

[0024] S3. Start the reactor and set the temperature. When the reactor is heated to 45-53°C, adjust the stirring rate to 150-180 r / min, weigh the filler according to the component, and gradually add it to the reactor, and keep stirring for 30-45 minutes until the filler is completely dispersed in the solution without particles;

[0025] S4. Weigh the leveling agent and anti-precipitation agent according to the components and heat them in a reactor. Adjust the temperature of the reactor to 55-63°C, adjust the stirring rate to 170-210 r / min, and stir for 20-30 minutes.

[0026] S5: Turn off the heating of the reactor and turn on the cooling circulating water to cool the reactor. After the temperature inside the reactor drops to 20-25°C, weigh the preservatives according to the components and add them into the reactor. Adjust the stirring speed to 60-80r / min and stir for 45-50 minutes to mix all the components evenly under low-speed stirring to obtain a film-forming material.

[0027] S6: Put the film-forming material obtained in S5 into a clean plastic barrel, seal it and store it for later use. It must be ensured that water vapor in the air does not easily enter the material to avoid failure. The plastic barrel must be brown and prevent light from irradiating the protective liquid to make it solidify slowly.

[0028] S7: Use a roller coater to evenly roll the film-forming material onto the glass surface, ensuring that the film thickness ranges from 20 to 30 um; then send the rolled glass into a curing furnace for curing to form a peelable protective layer on the glass surface. The curing furnace temperature is set at 50 to 70°C, and the curing time is 5 to 10 minutes.

[0029] The present invention adopts a roller coating method to directly form a protective film on the processed glass surface. Compared with the traditional film pasting method, this method does not need to consider the problems of gaps and bubbles generated between the protective film and the glass surface during the process, and the adhesion between the protective film and the glass surface is better.

[0030] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A peelable glass protective film, characterized in that: The protective film comprises the following components in parts by weight: 57-60 parts of chlorinated polyethylene, 3-4 parts of plasticizer, 27-30 parts of solvent, 2-3 parts of leveling agent, 1-2 parts of anti-precipitation agent, 1-2 parts of preservative and 4-5 parts of filler; wherein the plasticizer is dioctyl phthalate or cyclohexane dicarboxylate or tributyl citrate or epoxy soybean oil; the solvent is butyl acetate or propylene glycol methyl ether or toluene or xylene; the leveling agent is polyether modified polydimethylsiloxane or acrylate; the anti-precipitation agent is nano silicon dioxide or polyamide wax; the preservative is sodium benzoate or potassium sorbate; the filler is polyethylene wax micropowder or titanium dioxide or talc.

2. A method for preparing a peelable glass protective film according to claim 1, characterized in that: This method comprises the following steps: S1. Before using the reaction stirred tank, the inner wall of the reactor must be cleaned with anhydrous ethanol for at least 2 times. The waste liquid generated by the cleaning must be poured into a special waste liquid barrel for recycling; S2. Weigh the chlorinated polyethylene and the solvent according to the components, put them into a reaction kettle and stir for 20 to 30 minutes, and control the stirring rate to 80 to 110 r / min to fully dissolve the chlorinated polyethylene in the solvent; then weigh the plasticizer according to the components and add it into the reaction kettle, and adjust the stirring rate to 100 to 120 r / min, and stir for 15 to 25 minutes. During this process, the plasticizer and the chlorinated polyvinyl chloride undergo a polymerization reaction to form a multi-branched high molecular polymer; S3. Start the reactor and set the temperature. When the reactor is heated to 45-53°C, adjust the stirring rate to 150-180 r / min, weigh the filler according to the component, and gradually add it to the reactor, and keep stirring for 30-45 minutes until the filler is completely dispersed in the solution without particles; S4. Weigh the leveling agent and anti-precipitation agent according to the components and heat them in a reactor. Adjust the temperature of the reactor to 55-63°C, adjust the stirring rate to 170-210 r / min, and stir for 20-30 minutes. S5: Turn off the heating of the reactor and turn on the cooling circulating water to cool the reactor. After the temperature inside the reactor drops to 20-25°C, weigh the preservatives according to the components and add them into the reactor. Adjust the stirring speed to 60-80r / min and stir for 45-50 minutes to mix all the components evenly under low-speed stirring to obtain a film-forming material. S6: Put the film-forming material obtained in S5 into a clean plastic barrel, seal it and store it for later use. It must be ensured that water vapor in the air does not easily enter the material to avoid failure. The plastic barrel must be brown and prevent light from irradiating the protective liquid to make it solidify slowly. S7: Use a roller coater to evenly roll the film-forming material onto the glass surface, ensuring that the film thickness ranges from 20 to 30 um; then send the rolled glass into a curing furnace for curing to form a peelable protective layer on the glass surface. The curing furnace temperature is set at 50 to 70°C, and the curing time is 5 to 10 minutes.