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Polyurethane pressure-sensitive adhesive protective film and preparation method thereof

A polyurethane pressure-sensitive adhesive protective film and polyurethane pressure-sensitive adhesive technology, applied in the direction of pressure-sensitive film/sheet, polyurea/polyurethane adhesive, adhesive, etc., can solve the problems of yellowing, precipitation and loss of protection of the coating film , to achieve the effect of stable peeling force and enhanced heat resistance

Active Publication Date: 2022-03-04
GUANGDONG HONGQING ELECTRONICS MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyurethane pressure-sensitive adhesives inevitably have some defects. Because its molecular structure contains a large amount of carbamate structure, it is easy to hydrolyze. RH) prone to white mist or oil precipitation, remaining on the surface of the protected material, losing the concept of "protection"
[0003] In the existing methods, some carbodiimide hydrolysis stabilizers are often physically blended to inhibit hydrolysis, which affects other properties of polyurethane pressure-sensitive adhesives, such as yellow appearance and odor of the coating film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] A preparation method for a polyurethane pressure-sensitive adhesive protective film, comprising the steps of:

[0024] S1. Preparation of bishydroxysilane coupling agent: Add polyol, silane coupling agent containing isocyanate group, and catalyst I into the reaction vessel, heat up to 50°C-70°C, stir mechanically, and react for 5-10 hours to obtain Dihydroxysilane coupling agent;

[0025] S2. Preparation of polyurethane pressure-sensitive adhesive with dihydroxysilane coupling agent chain extension: add solvent, polyol, diisocyanate, and dihydroxysilane coupling agent prepared in step S1 into the reaction container, vacuumize and circulate nitrogen for 3 times, and then place React in an oil bath at 70°C to 80°C; after the reaction, a polyurethane pressure-sensitive adhesive with a carbamate structure in the main chain and active siloxane groups in the side chain is obtained;

[0026] S3. Preparation of polyurethane pressure-sensitive adhesive protective film with bish...

Embodiment 1

[0037] (1) Preparation of coupling agent containing dihydroxysilane

[0038] Add 8.00 g (0.059 mol) of trimethylolpropane, 12.22 g (0.059 mol) of 3-isocyanatopropyltrimethoxysilane, and 0.04 g of catalyst imidazole into a three-necked flask equipped with a thermometer and a stirring paddle, mechanically stir, and oil The bath was warmed to 70°C for reaction. Using Fourier transform infrared spectrometer to monitor the conversion rate of 3-isocyanate propyltrimethoxysilane, the reaction to the wave number in the infrared spectrum is 2270cm -1 The infrared stretching vibration peak of the nearby NCO disappears, and a bishydroxysilane coupling agent is obtained.

[0039] (2) Preparation of polyurethane pressure-sensitive adhesive with chain extension of dihydroxysilane coupling agent

[0040] Add 50.00 g (0.025 mol) of polypropylene glycol (average M=2000) to a three-necked flask equipped with a thermometer and a stirring paddle, 0.5 g (0.0014 mol) of the bishydroxysilane coupl...

Embodiment 2

[0044] (1) Preparation of coupling agent containing dihydroxysilane

[0045] Add 30 g (0.1 mol) of polyether 303 (trifunctional polypropylene glycol, average M=300) and 24.7 g (0.1 mol) of 3-isocyanatopropyltriethoxysilane into a three-necked flask equipped with a thermometer and a stirring paddle , 0.16 g of catalyst triethylamine, mechanically stirred, and the temperature of the oil bath was raised to 70° C. for reaction. Using Fourier transform infrared spectrometer to monitor the conversion rate of 3-isocyanate propyltrimethoxysilane, the reaction to the wave number in the infrared spectrum is 2270cm -1 The infrared stretching vibration peak of the nearby NCO disappears, and a bishydroxysilane coupling agent is obtained.

[0046] (2) Preparation of polyurethane pressure-sensitive adhesive with chain extension of dihydroxysilane coupling agent

[0047] Add 50.00 g (0.05 mol) of polypropylene glycol (average M=1000) to a three-necked flask equipped with a thermometer and a...

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Abstract

The invention relates to the technical field of pressure-sensitive adhesive protective films, in particular to a preparation method of a polyurethane pressure-sensitive adhesive protective film, which comprises the following steps: S1, preparing a dihydroxy silane coupling agent; s2, preparing a polyurethane pressure-sensitive adhesive subjected to chain extension by a dihydroxy silane coupling agent; and S3, preparing the polyurethane pressure-sensitive adhesive protective film subjected to chain extension by the dihydroxy silane coupling agent. The polyurethane pressure-sensitive adhesive protective film provided by the invention has the characteristics of stable stripping force at 180 DEG C, hydrolysis resistance and high temperature resistance.

Description

technical field [0001] The invention relates to the technical field of pressure-sensitive adhesive protective films, in particular to a polyurethane pressure-sensitive adhesive protective film and a preparation method thereof. Background technique [0002] In the field of pressure-sensitive adhesives for protective films, the types of adhesives can be roughly divided into three categories: polyacrylates, polyurethanes, and silicones. The comparison between the three: the main chain of the polyacrylate molecular chain is a C-C single bond, and the weather resistance is better. Good, but sensitive to temperature, "hot sticky and cold brittle", when used as a protective film, in order to pursue low peeling force, often add a large amount of cross-linking agent, so that the polymer storage modulus is too high, resulting in dust on the protective film ;Silicone adhesives have good heat resistance and weather resistance, but their price is relatively expensive, which limits their ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J7/25C09J7/38C08G18/66C08G18/32C08G18/48
CPCC09J175/08C09J7/255C09J7/38C08G18/6666C08G18/3893C08G18/48Y02E60/10
Inventor 方友池全超陈小聪梁书泉何志球
Owner GUANGDONG HONGQING ELECTRONICS MATERIALS TECH CO LTD
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