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Preparation method for polyurethane adhesive applied to protective film

A polyurethane adhesive and protective film technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, film/sheet adhesives, etc., can solve the problems of white fog, poor mechanical properties, poor heat resistance and oxidation resistance, etc. , to achieve the effect of low adhesion, good wetting performance and outstanding hydrolysis resistance

Active Publication Date: 2015-04-29
CYBRID TECHNOLOGIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties, heat resistance and oxidation resistance of polyether polyurethane are poor. The group can also partially form hydrogen bonds with the polar groups on the hard segment, so that the hard phase can be more evenly distributed in the soft phase, and play the role of elastic cross-linking points, but its structure contains ester groups, It is easy to hydrolyze under high temperature and high humidity environment, and the acid generated by hydrolysis can catalyze the further hydrolysis of polyester. Therefore, conventional polyurethane adhesives containing polyester polyurethane and polyether polyurethane are easy to hydrolyze and produce white fog when used as protective films. Phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of preparation method of polyurethane adhesive for protective film, its steps are as follows:

[0028] (1) Prepolymerization reaction: Install a mechanical stirring bar, a thermometer, a condenser and a nitrogen gas inlet on a 250ml three-necked flask. Weigh 10.435g of polyether triol with a number average molecular weight of 4000, 30g of toluene, 4.489g of hexamethylene diisocyanate, and 0.002g of dibutyltin dilaurate, dissolve the polyether triol in toluene, stir well , add hexamethylene diisocyanate and dibutyltin dilaurate, under the condition of stirring, heat the three-necked flask in a water bath to 70°C and keep it for 4h for prepolymerization;

[0029] (2) Chain extension reaction: After the above prepolymerization reaction is complete, add a mixture of 35.3g of toluene and 50.377g of polycarbonate diol with a number average molecular weight of 500, and raise the temperature of the water bath to 90°C, keep it for 5h, and stop After reaction, a colorless...

Embodiment 2

[0034] (1) Prepolymerization reaction: Install a mechanical stirring bar, a thermometer, a condenser and a nitrogen gas inlet on a 250ml three-necked flask. Weigh 7.214g of polyether diol with a number average molecular weight of 3000, 30g of toluene, 4.489g of hexamethylene diisocyanate, 0.002g of stannous octoate, dissolve the polyether triol in toluene, stir well, add Hexamethylene diisocyanate and dibutyltin dilaurate, under stirring conditions, the three-necked flask was heated to 70°C in a water bath and kept for 4 hours for prepolymerization;

[0035] (2) Chain extension reaction: After the above prepolymerization reaction is complete, add a mixture of 35.3g of toluene and 50.377g of polycarbonate triol with a number average molecular weight of 3000, and raise the temperature of the water bath to 95°C, keep it for 4h, and stop After reaction, a colorless transparent liquid is obtained, which is polyurethane adhesive.

[0036] In this embodiment, the reaction raw materi...

Embodiment 3

[0039] (1) Prepolymerization reaction: Install a mechanical stirring bar, a thermometer, a condenser and a nitrogen gas inlet on a 250ml three-necked flask. Weigh 5.691g of polyether triol with a number average molecular weight of 500, 30g of toluene, 4.489g of hexamethylene diisocyanate, and 0.002g of dibutyltin diacetate, dissolve the polyether triol in toluene, stir well, Add hexamethylene diisocyanate and dibutyltin dilaurate, and under stirring conditions, the temperature of the water bath is raised to 80°C and kept for 2 hours for prepolymerization;

[0040] (2) Chain extension reaction: After the prepolymerization reaction is complete, add a mixture of 35.3 g of toluene and 54.949 g of polycarbonate diol with a number average molecular weight of 2000, and raise the temperature of the water bath to 85 ° C. After 6 hours of reaction, stop After reaction, a colorless transparent liquid is obtained, which is polyurethane adhesive.

[0041] In this embodiment, the reaction ...

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Abstract

The invention discloses a preparation method for a polyurethane adhesive applied to a protective film. The preparation method specifically comprises the following steps: dissolving polyether polyol and hexamethylene diisocyanate in methylbenzene for prepolymerization under the condition of using organic tin as a catalyst; after the prepolymerization is completed, adding a mixture of polycarbonate polyol and methylbenzene for chain extension reaction to obtain colorless transparent polyurethane adhesive main agent. The prepared polyurethane adhesive applied to the protective film has the the advantages of both polyether urethane and polycarbonate urethane, such as outstanding hydrolysis resistance and excellent balance between flexibility and rigidity; the protective film with the polyurethane adhesive has the advantages of low viscosity, excellent exhaust performance, rime fog resistance and the like; furthermore, the preparation conditions of the adhesive are mild, and the preparation of the adhesive does not need special devices and only needs the traditional stirring and hydrothermal conditions; industrial production is facilitated.

Description

technical field [0001] The invention relates to a method for preparing a polyurethane adhesive for a protective film, in particular to a method for preparing the polyurethane adhesive by reacting polyether polyols and polycarbonate polyols with isocyanate. Background technique [0002] Polyurethane, as a block polymer, generally consists of a soft segment of a flexible long chain segment of an oligomer polyol, and a hard segment is formed of a diisocyanate or a chain extender, and the soft segment and the hard segment are alternately arranged to form a repeating structural unit. Polyurethanes are used in various structural bonding fields due to their excellent low-temperature properties, excellent shear strength and impact resistance properties, and a large number of polar groups. [0003] When polyurethane is used as a protective film, in addition to protecting the protected surface from being scratched or damaged by foreign objects, the protective film is also required to ...

Claims

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Application Information

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IPC IPC(8): C08G18/73C08G18/48C08G18/44C09J175/08C09J7/02
CPCC08G18/10C08G18/4018C08G18/44C08G18/4825C08G18/4829C08G18/73C09J7/20C09J175/08
Inventor 周琪权丁鹏徐孝平宇野敬一吴小平
Owner CYBRID TECHNOLOGIES INC
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