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Method for preparing organic silicon modified aqueous polyurethane adhesive

A water-based polyurethane and adhesive technology, applied in the directions of adhesives, adhesive types, starch-derived adhesives, etc., can solve problems such as reduced bonding performance, achieve enhanced bonding performance, improve peel strength, and solve the problem of bonding The effect of reduced performance

Inactive Publication Date: 2019-10-08
中著(杭州)知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The adhesive prepared by the present invention has a certain bonding performance due to the modified polyurethane and the oxidized starch itself. After grafting the branched oxidized starch, the bonding performance of the product is improved through the synergistic effect of the two, and then the bonding performance of the adhesive is improved. Excellent peel strength and tensile strength of the adhesive film. At the same time, by grafting oxidized starch and r-aminopropyltriethoxysilane, the branching of the modified polyurethane is improved, and the bonding performance of the polyurethane is further improved, and the grafting The r-aminopropyltriethoxysilane contains -SiOC 2 h 5 The bonds are hydrolyzed in hot water to form -Si-OH bonds. Since the temperature reaches 70 degrees in hot water, silanol condensation reactions occur between adjacent -Si-OH bonds to form -Si-O-Si-bonds , so that the adjacent modified polyurethane molecular chains are cross-linked into a network structure, which improves the cohesive force of the adhesive. The synergistic effect between them realizes the enhancement of the bonding performance of the adhesive, realizes that the bonding performance of the adhesive is not reduced but increases after the adhesive is dissolved in water, and solves the problem of the bonding performance of the existing water-based polyurethane adhesive after being dissolved in water. Lowering the problem

Method used

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  • Method for preparing organic silicon modified aqueous polyurethane adhesive
  • Method for preparing organic silicon modified aqueous polyurethane adhesive
  • Method for preparing organic silicon modified aqueous polyurethane adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] ①Weigh 1kg of 5-hydroxyisophthalic acid and dissolve it in 15L of pyridine, add 1kg of imidazole and 1.52kg of tert-butyldiphenylchlorosilane to it after heating up to 50°C, react at constant temperature for 2 hours, then use deionized water and saturated chlorine respectively Sodium chloride was washed, then dried with sodium sulfate and then rotary evaporated, and finally the column was carried out to obtain pure product A;

[0025] ② Add 1 kg of the product A prepared in step ① to 15 LN,N-dimethylformamide, heat up to 80°C, add 2.32 kg of thionyl chloride to it, react at constant temperature for 5 hours, and then filter and wash to obtain bisacyl chloride prepolymer.

Embodiment 2

[0027] A preparation method of silicone modified water-based polyurethane adhesive, comprising the following preparation process:

[0028] In the first step, add 1kg of the bisacyl chloride-based prepolymer prepared in Example 1 into 10L of acetone, raise the temperature to 60°C, and at the same time add 2.5L of ethylenediamine solution to the reaction vessel, react at constant temperature for 3 hours, then directly filter, wash and dry , to obtain modified polyurethane polymer;

[0029] In the second step, add 1kg of the modified polyurethane polymer prepared in the first step into water, raise the temperature to 70°C, then add 0.86kg of tetramethylammonium fluoride to it, react at constant temperature for 5 hours, and then wash it with deionized water drying to obtain a hydroxylated modified polyamide polymer;

[0030] The third step is to weigh a certain amount of oxidized starch and dissolve it in acetone to form an oxidized starch solution with a concentration of 200g / L....

Embodiment 3

[0033] A preparation method of silicone modified water-based polyurethane adhesive, comprising the following preparation process:

[0034] In the first step, add 1kg of the bisacyl chloride-based prepolymer prepared in Example 1 into 12L of acetone, raise the temperature to 60°C, and at the same time add 3L of ethylenediamine solution to the reaction vessel, react at constant temperature for 3h, then directly filter, wash and dry, Obtain modified polyurethane polymer;

[0035] In the second step, add 1kg of the modified polyurethane polymer prepared in the first step into water, raise the temperature to 70°C, then add 0.89kg of tetramethylammonium fluoride to it, react at constant temperature for 5 hours, and then wash it with deionized water drying to obtain a hydroxylated modified polyamide polymer;

[0036] The third step is to weigh a certain amount of oxidized starch and dissolve it in acetone to form an oxidized starch solution with a concentration of 200g / L. Add 1kg of...

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Abstract

The invention discloses a method for preparing an organic silicon modified aqueous polyurethane adhesive. The method comprises the following steps: putting an acyl dichloride prepolymer into acetone,increasing the temperature to 60 DEG C, putting an ethidene diamine solution into a reaction container, and performing a constant-temperature reaction for 3 hours so as to obtain a modified polyurethane polymer; putting the modified polyurethane polymer into water, adding tetramethylammonium fluoride into the mixture, and performing a reaction for 5 hours so as to obtain a hydroxylated modified polyamide polymer; putting the hydroxylated modified polyamide polymer and acetone into a four-hole flask, at the same time adding a prepared oxidized starch solution, at the same time dropping gamma-amino propyl triethoxy silane and hexamethylene diisocyanate into the reaction container and performing a constant-temperature reaction for 5 hours, so as to obtain the adhesive. According to the adhesive prepared by using the method, after the oxidized starch solution and the gamma-amino propyl triethoxy silane are put into synthesized hydroxyl polyurethane, the tension strength of an adhesive membrane made of the prepared adhesive is improved toto 2.02MPa, and meanwhile, the peel strength of the adhesive is up to 152.36N.25mm<-1>.

Description

technical field [0001] The invention belongs to the field of adhesive preparation, and relates to a method for preparing a silicone-modified water-based polyurethane adhesive. Background technique [0002] Polyurethane adhesives have the advantages of good flexibility, low temperature resistance, and high bonding strength, and are widely used. However, the existing polyurethane adhesives are usually solvent-based and need to be dissolved in benzene, ester, and ketone solvents. , but the use of these solvents will not only pollute the environment, but also cause certain harm to the human body. The development of water-based polyurethane is very important, but the bonding strength of the existing water-based polyurethane adhesives is generally low, and sticky after being dissolved in water Junction performance is generally reduced and cannot meet the requirements. Contents of the invention [0003] The object of the present invention is to provide a kind of preparation meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/48C08B31/00C09J177/00C09J103/04
CPCC08B31/00C08G69/48C09J103/04C09J177/00
Inventor 周佳佳
Owner 中著(杭州)知识产权运营有限公司
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