Polyurethane protective film and preparation method thereof

A protective film and polyurethane technology, applied in polyurea/polyurethane coatings, conductive coatings, coatings, etc., can solve the problems of easy precipitation of antistatic agents, contamination of screens, and difficulty in precipitation, etc.

Pending Publication Date: 2021-09-14
HEFEI LUCKY SCI & TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the tearing voltage of the existing optical PU protective film is relatively large, and at the same time solve the problem that the antistatic agent added to the PU protective film is easy to precipitate and pollute the screen in a high-temperature and

Method used

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  • Polyurethane protective film and preparation method thereof
  • Polyurethane protective film and preparation method thereof
  • Polyurethane protective film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 40g of petroleum ether, 60g of dichloromethane and mix evenly at high speed, then add 5g of polyethylene glycol laurate, 15g of trishydroxyethylmethyl quaternary ammonium methyl sulfate, 5g of polyethylene glycol stearate , 0.1g γ-methacryloxypropylmethyldiethoxysilane, 0.5g vinyltrimethoxysilane, 0.1g vinyltris(2-methoxyethoxy)silane, at 30℃ After reacting for 3 hours, the modified antistatic agent can be obtained after vacuum drying at last.

[0035] With 100g of polyurethane resin, 80g of methylene chloride and 2.5g of triethylamine, stir at room temperature for 15 minutes, then add 3g of modified antistatic agent, polymerize at 70°C for 4 hours, and naturally cool to room temperature to obtain a compound Polyurethane resin. Under this condition, the amino functional group attached to the polyurethane resin can react with the ester functional group attached to the modified antistatic agent to form an amide functional group and form a chemical covalent bond to ob...

Embodiment 2

[0038] Weigh 50g of petroleum ether, 50g of dichloromethane and mix evenly at high speed, then add 6g of polyethylene glycol laurate, 18g of trishydroxyethylmethyl quaternary ammonium methyl sulfate, 8g of polyethylene glycol stearate , 0.1g γ-methacryloxypropylmethyldiethoxysilane, 0.5g vinyltrimethoxysilane, 0.2g vinyltris(2-methoxyethoxy)silane, at 35℃ After reacting for 2.5 hours, the modified antistatic agent can be obtained after vacuum drying at last.

[0039] With 110g of polyurethane resin, 85g of dichloromethane and 2.8g of triethylamine, stir at room temperature for 15 minutes, then add 4g of modified antistatic agent, polymerize at 75°C for 3.6 hours, and naturally cool to room temperature to obtain a composite Polyurethane resin. Under this condition, the amino functional group attached to the polyurethane resin can react with the ester functional group attached to the modified antistatic agent to form an amide functional group and form a chemical covalent bond t...

Embodiment 3

[0042] Weigh 55g of petroleum ether, 45g of dichloromethane and mix evenly at high speed, then add 3g of polyethylene glycol laurate, 16g of trishydroxyethylmethyl quaternary ammonium methyl sulfate, 9g of polyethylene glycol stearate , 0.05g γ-methacryloxypropylmethyldiethoxysilane, 0.5g vinyltrimethoxysilane, 0.25g vinyltris(2-methoxyethoxy)silane, at 35℃ After reacting for 2.5 hours, the modified antistatic agent can be obtained after vacuum drying at last.

[0043] With 120g of polyurethane resin, 90g of methylene chloride and 3.5g of triethylamine, stir at room temperature for 15 minutes, then add 5g of modified antistatic agent, polymerize at 80°C for 3 hours, and naturally cool to room temperature to obtain a compound Polyurethane resin. Under this condition, the amino functional group attached to the polyurethane resin can react with the ester functional group attached to the modified antistatic agent to form an amide functional group and form a chemical covalent bond...

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Abstract

The invention relates to a polyurethane protective film and a preparation method thereof, the polyurethane protective film comprises a single-side antistatic PET base material layer, an antistatic coating and a PET antistatic release film layer, the other side of the single-side antistatic PET base material layer is coated with the antistatic coating, and the antistatic coating comprises the following components in parts by weight: 40-70 parts of composite polyurethane resin; 0.4-4.0 parts of a curing agent; 0.2-2.8 parts of a leveling agent; and 100-140 parts of a solvent, wherein the composite polyurethane resin is prepared from polyurethane resin and a modified antistatic agent; the antistatic agent comprises a trihydroxyethyl methyl quaternary ammonium methyl sulfate salt, or one or any combination of the trihydroxyethyl methyl quaternary ammonium methyl sulfate salt, polyethylene glycol stearate and polyethylene glycol laurate; the ratio of the polyethylene glycol laurate to the trihydroxyethyl methyl quaternary ammonium sulfate methyl ester salt to the polyethylene glycol stearate is (0-0.4): 1: (0-0.6). According to the polyurethane protective film disclosed by the invention, the tearing voltage generated when the protective film of the touch screen is torn is relatively low, and the modified antistatic agent is not easy to separate out under high-temperature and high-humidity conditions.

Description

technical field [0001] The invention relates to the field of film technology, in particular to a polyurethane protective film and a preparation method thereof. Background technique [0002] In recent years, with the emergence of various electronic products such as smartphones and tablet computers, in order to prevent the LCD screen of electronic products from being scratched or worn, which will affect the use effect, a layer of screen protection film is generally attached to the surface of the screen. Among various types of protective films, polyurethane (PU) protective film is a functional protective film made of transparent polyester film as the base material, coated with polyurethane glue on one side, and then pasted with a release film. PU protective film has the advantages of flat and smooth surface, good exhaust performance, good adsorption performance, etc. It is mainly used for high-temperature production protection of LCD panels, and shipment protection of ITO and g...

Claims

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Application Information

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IPC IPC(8): C08J7/044C08L67/02C09D5/24C09D175/04
CPCC08J7/042C08J7/044C09D175/04C09D5/24C08J2367/02C08J2475/04C08L71/02C08K5/41
Inventor 牛正富刘世军安佳丽祝亮周守发孙晶晶
Owner HEFEI LUCKY SCI & TECH IND
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