Polyimide modified polyurethane adhesive and preparing method thereof

A polyurethane adhesive, polyimide technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the complexity of the preparation process of polyimide modified polyurethane adhesives, Obstructing the industrial production process of high-performance adhesives, increasing the cost of adhesive preparation, etc., to achieve the effect of broadening the use temperature range, improving high temperature resistance and reducing production costs

Inactive Publication Date: 2016-08-17
JIUSHENG WOOD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the introduction process of imide functional groups is relatively simple at present, the preparation of amino-terminated polyimides in the early stage of introduction requires complex operations such as high-temperature prepolymerization and high-temperature dehydration, and amino-terminated polyimides are refractory, difficult to Dissolution and other problems increase the difficulty of reaction with isocyanate groups
The existence of these problems directly leads to the complexity of the preparation process of polyimide-modified polyurethane adhesives, increases the cost of adhesive preparation, and hinders the industrial production process of such high-performance adhesives.

Method used

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  • Polyimide modified polyurethane adhesive and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: A polyimide-modified polyurethane adhesive made of the following raw materials in parts by weight: 40 parts of polytetrahydrofuran diol (molecular weight 2000), 8.7 parts of 4,4'-diphenylmethane diisocyanate , 2.2 parts of pyromellitic dianhydride, 0.8 parts of dimethyl silicone oil, 0.06 parts of triethylenediamine, 20 parts of diisooctyl phthalate, 0.05 parts of p-toluenesulfonyl isocyanate, γ- 0.05 parts of aminopropyltriethoxysilane, 0.05 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropanoic acid octadecanoate.

[0043] Concrete preparation steps are:

[0044] 1) Weigh 400g of polytetrahydrofuran diol with a molecular weight of 2000 and put it into a 1L reaction kettle, stir and heat to 100°C, and vacuumize and dehydrate for 4 hours;

[0045] 2) Add 8 g of simethicone oil and 22 g of pyromellitic dianhydride to the polytetrahydrofuran diol cooled to room temperature after dehydration treatment, and mechanically stir evenly;

[0046]3) Add 87g of 4,4'-diph...

Embodiment 2

[0049] Embodiment 2: A polyimide modified polyurethane adhesive is made of the following raw materials in parts by weight: 35 parts of tetrahydrofuran-ethylene oxide copolymerized glycol (molecular weight 3000), 12.2 parts of hexamethylene diisocyanate, 3 , 5 parts of 3′,4,4′-biphenyltetraacid dianhydride, 1.6 parts of dimethyl silicone oil, 0.12 parts of triethylenediamine, 35 parts of diisooctyl phthalate, 35 parts of orthoformic acid 0.13 parts of ethyl ester, 0.3 parts of γ-(methacryloyloxy)propyltrimethoxysilane, and 0.08 parts of isooctyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate.

[0050] Concrete preparation steps are:

[0051] 1) Weigh 350g of tetrahydrofuran-ethylene oxide copolyglycol with a molecular weight of 3000 and put it into a 2L reaction kettle, stir and heat to 95°C, and vacuumize and dehydrate for 4 hours;

[0052] 2) Add 16 g of simethicone oil and 50 g of 3,3′,4,4′-biphenyltetraacid dianhydride to the tetrahydrofuran-ethylene oxide copolyethylene glyc...

Embodiment 3

[0056] Embodiment 3: Comprehensive performance test of adhesive force.

[0057] Shear strength is measured according to GB7124-86;

[0058] Peel strength is measured according to GB / T7122-1996.

[0059] Take the adhesives of Examples 1 and 2, and then take the polyurethane adhesive commonly used in the industry as a comparison group, and measure the shear strength and peel strength after curing at room temperature for 24 hours, 3 days and 10 days, see Table 1.

[0060] Table 1 Adhesive adhesion test

[0061]

[0062] It can be seen from Table 1 that the shear strength of the adhesives of Example 1 and Example 2 is significantly better than that of the comparison group at 25°C, and the shear strength is also much better than that of the comparison group at 150°C, and the effect is very good. significantly. And the peel strength of Example 1 and Example 2 is also much better than that of the comparison group. It can be seen that the present invention not only has superior...

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Abstract

The invention discloses a polyimide modified polyurethane adhesive and a preparing method thereof. The polyimide modified polyurethane adhesive is prepared from, by weight, 5-20 parts of polyisocyanates, 1-10 parts of polybasic anhydride, 30-50 parts of polyhydric alcohols, 20-50 parts of plasticizer, 0.02-0.20 part of catalyst, 0.5-3 parts of defoamer, 0.02-0.20 part of water remover, 0.02-0.5 part of coupling gent and 0.02-0.20 part of antioxidant. The high temperature resistance of the polyurethane adhesive can be effectively improved, and the application temperature range of the polyurethane adhesive can be widened; the preparing process of the polyimide modified polyurethane adhesive is greatly simplified, and the production cost of the polyimide modified polyurethane adhesive is reduced.

Description

technical field [0001] The invention relates to a polyimide modified polyurethane adhesive and a preparation method thereof, belonging to the technical field of adhesive production. Background technique [0002] Polyurethane adhesives are an important branch in the field of adhesives. Polyurethane adhesives rely on the reaction between isocyanate groups in the system and substances containing active hydrogen outside the system to form chemical bonds to achieve the purpose of bonding. Compared with phenolic adhesives and epoxy adhesives, it has the advantages of high bonding strength, high initial adhesion, high storage stability, fast drying speed, environmental friendliness, simple construction process and wide construction temperature range. In addition, polyurethane adhesive has excellent rubber characteristics, can adapt to the bonding of substrates with different thermal expansion coefficients, can form a soft-hard transition layer between substrates, and has excellent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/76C08G18/73C08G18/48C08G18/64C08G18/12C08G73/10
CPCC08G18/12C08G18/4081C08G18/4854C08G18/6438C08G18/73C08G18/7671C08G73/1035C08L2201/08C09J175/08C08L83/04C08G18/32
Inventor 孙龙祥吴忠其王艳伟
Owner JIUSHENG WOOD
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