A kind of preparation method of high temperature resistant high humidity polyurethane adhesive

A polyurethane adhesive, high temperature resistant technology, applied in polyurea/polyurethane adhesives, botanical equipment and methods, adhesives, etc., can solve the problems of reduced bonding performance of polyurethane adhesives and achieve high adhesion , the effect of high antibacterial properties

Active Publication Date: 2021-05-07
佛山市龙源镭射科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of high-temperature-resistant high-humidity polyurethane adhesive, wherein the auxiliary antioxidant polymer chain prepared contains -NH-COO-bond, which can react with one end of the antibacterial cross-linking agent for cross-linking, At the same time, due to the branched chain grafted on the antibacterial polymer chain group, which can react with the other end of the antibacterial cross-linking agent, so that one end of the antibacterial cross-linking agent is connected to the carbonyl side of the ester group in -NH-COO-, and the other end is connected to the hydroxyl end of the ester group, making the adhesion When the agent is hydrolyzed in a high-temperature and high-humidity environment, the polymer chains are still connected by the antibacterial cross-linking agent, and can still be tightly compounded on the surface of the specimen, and the adhesive strength will not be reduced due to hydrolysis. The amino group in the amino acid directly interacts with the antibacterial crosslinking agent at high temperature, so that the hydrogen bond in it is converted into a chain connection, and it will not break under the action of high temperature and high humidity, thus effectively solving the problem of the bonding performance of the existing polyurethane adhesive in high temperature water. Lowering the problem

Method used

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  • A kind of preparation method of high temperature resistant high humidity polyurethane adhesive
  • A kind of preparation method of high temperature resistant high humidity polyurethane adhesive
  • A kind of preparation method of high temperature resistant high humidity polyurethane adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The concrete preparation process of antibacterial cross-linking agent is as follows:

[0035] (1) Add 2 mol of methyl 3-mercaptopropionate and 300 mL of ammonia water with a mass concentration of 25% into a reaction kettle at a temperature of 5°C, stir and react for 2 hours, then slowly heat up to 60°C for 4 hours, and then evaporate The ammoniacal liquor of reaction obtains 3-mercaptopropionamide; Carry out infrared analysis to product and know, at 3189cm -1 and 3366cm -1 Amino doublets appeared at the place;

[0036] (2) Add 2mol 3-mercaptopropionamide and 100mL dichloromethane into the reaction kettle at the same time, raise the temperature to 45°C, then add 3mol sulfonyl chloride dropwise, control the dropwise addition within 1h, then keep the temperature for 7h, and carry out rotary evaporation , reclaim the solvent, then recrystallize the product obtained with petroleum ether to obtain 5-chloroisothiazolinone; carry out infrared analysis on the product, it can b...

Embodiment 2

[0044] The concrete preparation process of linking agent is as follows:

[0045] (1) Add a mixed solvent of 200mL ethanol and 100mL water, 80g paraformaldehyde and 226 (2mol) g N-isopropylacrylamide into the reaction tank, stir and dissolve, heat up to 65°C, and then add 396g (2.1mol) Nitrophenol, stirred and reacted for 7 hours, crystals were precipitated after the solvent was evaporated, and the obtained crystals were recrystallized with ethanol to obtain acrylamide nitrophenol. The reaction structure was as follows, and the product was carried out by infrared analysis. -1 The infrared absorption peak of conjugated olefin appeared at 3350cm -1 The infrared absorption peak of the phenolic hydroxyl group appears, and the carbon atoms in the ortho-position of the phenolic hydroxyl group and the meta-position of the nitro group contain active hydrogen, which can carry out aminomethylation reactions. By controlling the amount of N-isopropylacrylamide added, the One of the ortho-...

Embodiment 3

[0049] The concrete preparation process of linking agent is as follows:

[0050] Add 200mL of ethanol and 100mL of mixed solvent of water, 80g of paraformaldehyde and 113g (1mol) g of N-isopropylacrylamide into the reaction tank, stir and dissolve, heat up to 65°C, and then add 396g (2.1mol) of p-nitrophenol , stirred and reacted for 7h, crystals were precipitated after the solvent was evaporated, and the obtained crystals were recrystallized with ethanol to obtain acrylamidonitrophenol; the reaction structure was as follows, and the product was carried out by infrared analysis. -1 The infrared absorption peak of conjugated olefin appeared at 3350cm -1 There is no infrared absorption peak of the phenolic hydroxyl group, and the carbon atoms in the ortho-position of the phenolic hydroxyl group and the meta-position of the nitro group contain active hydrogen, which can carry out aminomethylation reaction. By controlling the amount of N-isopropylacrylamide added, the One of the ...

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Abstract

The invention discloses a method for preparing a high-temperature-resistant and high-humidity polyurethane adhesive. The specific preparation process is as follows: Weigh a certain amount of antibacterial crosslinking agent, antibacterial-promoting polymer and ethanol solution and add them into a reaction kettle at the same time, stir and dissolve, then heat up and react 2h, then add triethylamine thereinto, after the reaction, then cool and discharge, remove the solvent, add the solid matter into ethanol, stir to configure polyurethane adhesive liquid. One end of the antibacterial cross-linking agent prepared by the present invention is connected to the carbonyl side of the ester group in the antioxidant-promoting polymer -NH-COO-, and the other end is connected to the hydroxyl end of the ester group in it, so that the adhesive is hydrolyzed in high-temperature water At the same time, the polymer chains are still connected by the antibacterial cross-linking agent, and can still be tightly compounded on the surface of the test piece, and the adhesive strength will not be reduced due to hydrolysis.

Description

technical field [0001] The invention belongs to the field of adhesive preparation, and relates to a preparation method of a high-temperature and high-humidity polyurethane adhesive. Background technique [0002] Polyurethane adhesives can be used for bonding metal, rubber, plastic, fabric, leather, rubber and plastic materials, wood, ceramics, glass, etc. to themselves or between each other, and even have certain bonding strength for difficult-to-bond polyethylene and polypropylene , but the heat resistance of polyurethane adhesives is poor, and it is easy to hydrolyze under high temperature and high humidity to reduce the bonding strength. In order to improve the heat resistance of the adhesive, in the prior art, hydrophobic oxygen is usually introduced into the polymer. The base silane bond not only achieves high temperature resistance, but also can be hydrophobic. However, because the prepared polyurethane contains -NHCOO- groups, and weak hydrogen bonds are easily formed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C08G77/388C08G77/16C08G77/46C08G18/65C08G18/61C08G18/75C08G18/10C08G18/32C08G18/83A01N55/10A01P1/00
CPCA01N33/12A01N43/80A01N55/00C08G18/10C08G18/61C08G18/755C08G18/83C08G18/833C08G77/16C08G77/388C08G77/46C09J175/04C08G18/3206
Inventor 钟雨玲
Owner 佛山市龙源镭射科技有限公司
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