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A kind of water-soluble formaldehyde-free wood adhesive and its preparation method and application

A wood adhesive, water-soluble technology, applied in the direction of adhesives, coatings, etc.

Active Publication Date: 2021-07-06
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is a lack of a high-performance water-soluble completely formaldehyde-free wood adhesive and its preparation method and application

Method used

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  • A kind of water-soluble formaldehyde-free wood adhesive and its preparation method and application
  • A kind of water-soluble formaldehyde-free wood adhesive and its preparation method and application
  • A kind of water-soluble formaldehyde-free wood adhesive and its preparation method and application

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preparation example Construction

[0026] The preparation method of the water-soluble formaldehyde-free wood adhesive of the present invention comprises the following steps: the water-soluble formaldehyde-free wood adhesive generated by reacting branched polyamine and urea at 110-130° C. for 5.0-10.0 h, the urea and The molar ratio of the polyamino compound PAM is 2:1-8:1 to prepare a water-soluble formaldehyde-free wood adhesive.

[0027] The highly branched polymer resin adhesive produced by the reaction can be dissolved in the water phase, and the solid content after dissolution can be controlled at 40%-60%.

Embodiment 1

[0029] The preparation method of water-soluble formaldehyde-free wood adhesive of the present invention, comprises the steps: take polyamino compound PAM (28.5649g), add in the there-necked flask, add urea (6.64g) respectively again, the mol ratio of urea and PAM The ratio is 2:1, the reaction is mixed and stirred in an oil bath, reacted at 115°C for 10h, then cooled to room temperature, and added water to form a solution with a solid content of 40-60%.

Embodiment 2

[0031] The preparation method of water-soluble formaldehyde-free wood adhesive of the present invention, comprises the steps: take polyamino compound PAM (32.1314g), add in the there-necked flask, add urea (11.2g) respectively again, the mol ratio of urea and PAM The ratio is 3:1, the reaction is mixed and stirred in an oil bath, reacted at 115°C for 10h, then cooled to room temperature, and added water to form a solution with a solid content of 40-60%.

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Abstract

The invention discloses a water-soluble formaldehyde-free wood adhesive and its preparation method and application. The water-soluble formaldehyde-free wood adhesive is composed of branched polyamine and urea. The molar ratio of the urea to the branched polyamine PAM is 2:1-8:1. The preparation process of the polymer of the present invention is simple, and has no harm to the human body. When applied to wood adhesives, the polymer has good water resistance, moderate viscosity, stable long-term storage, and both dry strength and wet strength are superior to biomass adhesives.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a water-soluble formaldehyde-free wood adhesive and its preparation method and application. Background technique [0002] At present, wood-based panels are used in all aspects of life, especially decoration and furniture industries. In the wood-based panel industry, most wood adhesives are made of urea-formaldehyde resin (UF), phenolic resin (PF) and melamine resin ( MF) is the representative formaldehyde series resin. Although its adhesive performance is good, there are many deficiencies. For example, there is residual free formaldehyde during the resin synthesis process; in addition, since the addition and polycondensation reactions are reversible reactions, the resin molecules will depolymerize especially in high temperature environments. These two reasons will lead to the release of formaldehyde during the use of wood-based panel products, which will cause harm t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J179/02C09D179/02C08G73/02
CPCC08G73/02C09D179/02C09J179/02
Inventor 杨龙李智杨红星杜官本冉鑫侯小茜
Owner SOUTHWEST FORESTRY UNIVERSITY
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