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Reactive polyurethane hot melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive and reactive technology, which is applied in the field of materials, can solve problems such as adverse effects on hot-melt adhesive performance, generation of bubbles, and performance impact

Active Publication Date: 2021-04-23
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the curing process of ordinary reactive polyurethane hot melt adhesives requires moisture. The humidity in the air and the moisture permeability of the substrate to be bonded directly affect the curing degree of reactive polyurethane hot melt adhesives. Ordinary reactive polyurethane hot melt adhesives cannot be bonded effectively in winter, or between materials with extremely low moisture permeability, such as metals, non-polar plastics, and some rubbers with poor moisture permeability. Moisture curing, which affects its performance
Moreover, the curing process of ordinary reactive polyurethane hot melt adhesives will produce air bubbles, which will adversely affect the performance of hot melt adhesives

Method used

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  • Reactive polyurethane hot melt adhesive and preparation method thereof
  • Reactive polyurethane hot melt adhesive and preparation method thereof
  • Reactive polyurethane hot melt adhesive and preparation method thereof

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preparation example Construction

[0070] Preparation of Component A: Stir and mix the polyol, thermoplastic resin, catalyst and additives at a temperature of 105°C. After the mixture turns into a liquid at high temperature, stir under reduced pressure to remove the water contained in the mixture. After the water content is lower than 200ppm, dry nitrogen with a purity of 99.9% is passed through to restore the normal pressure of the reactor, and it is stored at room temperature under the isolation of moisture.

[0071] Preparation of Component B: Stir the polyol under reduced pressure at a temperature of 105°C to remove the moisture contained in the material. When the moisture content is lower than 200ppm, pass dry nitrogen with a purity of 99.9% to restore the reactor to normal pressure. , and add polyisocyanate, after reacting for 50 minutes, add additives, and then pass dry nitrogen with a purity of 99.9% to restore the normal pressure of the reactor after degassing under reduced pressure again, and store it ...

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Abstract

The invention relates to a reactive polyurethane hot melt adhesive and a preparation method thereof. The reactive polyurethane hot melt adhesive comprises a component A and a component B, wherein the component A is prepared from the following components in parts by weight: 25-50 parts of polyamine of which the functionality is not less than 2, 30-60 parts of polyol with the functionality being not less than 2, 0-30 parts of thermoplastic resin, and 0.01-0.1 part of a catalyst, and the component B is prepared from the following components in parts by weight: 90-100 parts of a polyurethane prepolymer with the functionality of not less than 2. The reactive polyurethane hot melt adhesive provided by the invention does not depend on external moisture, does not easily generate gas, and can quickly improve the crosslinking degree and bonding degree in a short time.

Description

technical field [0001] The invention relates to the field of materials, in particular to a reactive polyurethane hot melt adhesive and a preparation method thereof. Background technique [0002] Traditional hot melt adhesive is a kind of plastic adhesive. Its physical state changes with temperature within a certain temperature range, but its chemical properties remain unchanged. The force between it and the bonding substrate is mainly van der Waals force. Insufficient bonding strength, coupled with the characteristics of the raw material itself, is greatly affected by temperature, resulting in poor heat resistance. In a high temperature environment, it is easy to cause bonding failure; similarly, in a high humidity environment, it is also easy to cause bonding failure. [0003] In some application fields, reactive polyurethane hot melt adhesives have been used as a substitute for traditional hot melt adhesives for nearly 30 years, mainly because polyester / polyether polyols r...

Claims

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Application Information

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IPC IPC(8): C09J175/04C09J11/08C08G18/48C08G18/42C08G18/50
CPCC09J175/04C09J11/08C08G18/4018C08G18/4825C08G18/5021C08G18/4238C08L2205/025C08L33/04C08L75/04
Inventor 石俊杰陈精华张健臻陈建军黄恒超
Owner GUANGZHOU BAIYUN CHEM IND
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