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Preparation method of high-temperature-resistant and high-humidity-resistant polyurethane adhesive

A technology of polyurethane adhesives and high temperature resistance, applied in polyurea/polyurethane adhesives, botany equipment and methods, adhesives, etc., can solve the problems such as the reduction of the bonding performance of polyurethane adhesives, and achieve high activity effects

Active Publication Date: 2020-12-29
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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  • Preparation method of high-temperature-resistant and high-humidity-resistant polyurethane adhesive
  • Preparation method of high-temperature-resistant and high-humidity-resistant polyurethane adhesive
  • Preparation method of high-temperature-resistant and high-humidity-resistant polyurethane adhesive

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Experimental program
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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 distilled off, and the obtained crystals were recrystallized with ethanol to obtain acrylamidonitrophenol; -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, the One of the ortho-position reactions of the hydroxyl group in nitrophenol;

[0051]

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Abstract

The invention discloses a preparation method of a high-temperature-resistant and high-humidity-resistant polyurethane adhesive, which comprises the following steps: weighing a certain amount of antimicrobial crosslinking agent, assistant antimicrobial polymer and ethanol solution, simultaneously adding the substances into a reaction kettle, stirring to dissolve, heating to react for 2 hours, then,adding triethylamine, and carrying out reacting, cooling, and discharging; removing the solvent, adding the solid substance into ethanol, and stirring to prepare polyurethane adhesive mucilage; one end of the prepared antibacterial cross-linking agent is connected with one side of carbonyl of ester groups in -NH-COO- in the auxiliary antioxidant polymer, and the other end of the antibacterial cross-linking agent is connected with one end of hydroxyl of the ester groups, so that when the adhesive is hydrolyzed in high-temperature water, polymer chains are still connected through the antibacterial cross-linking agent and can still be tightly compounded on the surface of a test piece; and the bonding strength is not 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, plastics, fabrics, leather, rubber-plastic materials, wood, ceramics, glass, etc. themselves or each other, and even have certain bonding strength for difficult-to-bond polyethylene and polypropylene. However, 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 adhesives, in the prior art, hydrophobic oxygen is usually introduced into polymers silane bond, not only to achieve high temperature resistance, but also to be hydrophobic, but because the prepared polyurethane contains -NHCOO- group, and the amino group in it and the adjacent polymer carbonyl easily...

Claims

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Application Information

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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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