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Modified PAE resin cross-linking agent, modified adhesive and application

A technology of resin cross-linking agent and modifier, applied in the direction of adhesive additives, polymer adhesive additives, adhesives, etc. Social benefits, simple and easy process, high bonding strength

Active Publication Date: 2020-05-19
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in actual production, the wood-based panels prepared by PAE modified soybean protein adhesives have problems such as poor initial adhesion and poor pre-pressing performance, which prolongs the pre-pressing time (3-4 hours), making boarding difficult and difficult. Unable to fill the core
The reason is that the moisture content of the base material used in the manufacture of wood-based panels is too high and unstable, and a monomolecular hydration layer is easily formed between the surfaces of the base material. This layer of hydration film seriously prevents the adhesion between the adhesive and the base material. In close chemical contact, the surface energy of the adherend that provides the driving force for the adhesion is greatly reduced, and the wet bonding strength is reduced or even eliminated, resulting in prolonged pre-pressing time of wood-based panels and a serious decline in pre-pressing performance

Method used

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  • Modified PAE resin cross-linking agent, modified adhesive and application
  • Modified PAE resin cross-linking agent, modified adhesive and application
  • Modified PAE resin cross-linking agent, modified adhesive and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1. This embodiment provides a modified PAE resin crosslinking agent, which is made of the following raw materials in parts by weight:

[0059]

[0060] The present embodiment also provides the preparation method of this modified PAE resin crosslinking agent, comprising:

[0061] (1) Preparation of polyamide polyamine intermediate. Add 15kg of adipic acid and 10kg of diethylenetriamine into the reaction kettle, and stir for 30 minutes after the raw materials are completely mixed. Raise the temperature to the predetermined reaction temperature, begin to evaporate the water in the solution, and keep the temperature for 5 hours. After the water is evaporated to dryness, stop heating immediately, add a certain proportion of water to adjust the solid content to 30wt% when the temperature is lowered to below 120°C, and stop stirring after stirring until homogeneous. The whole process was protected by nitrogen gas.

[0062] (2) Preparation of grafted catechol group prepol...

Embodiment 2

[0077] 1. This embodiment provides a modified PAE resin crosslinking agent, which is made of the following raw materials in parts by weight:

[0078]

[0079] The present embodiment also provides the preparation method of this modified PAE resin crosslinking agent, comprising:

[0080] (1) Preparation of polyamide polyamine intermediate. Add 15kg of adipic acid and 10kg of diethylenetriamine into the reaction kettle, and stir for 30 minutes after the raw materials are completely mixed. Raise the temperature to the predetermined reaction temperature, begin to evaporate the water in the solution, and keep the temperature for 5 hours. After the water is evaporated to dryness, stop heating immediately, add a certain proportion of water to adjust the solid content to 30wt% when the temperature is lowered to below 120°C, and stop stirring after stirring until homogeneous. The whole process was protected by nitrogen gas.

[0081] (2) Preparation of grafted catechol group prepol...

Embodiment 3

[0095] 1. This embodiment provides a modified PAE resin crosslinking agent, which is made of the following raw materials in parts by weight:

[0096]

[0097] The present embodiment also provides the preparation method of this modified PAE resin crosslinking agent, comprising:

[0098] (1) Preparation of polyamide polyamine intermediate. Add 15kg of adipic acid and 10kg of diethylenetriamine into the reaction kettle, and stir for 30 minutes after the raw materials are completely mixed. Raise the temperature to the predetermined reaction temperature, begin to evaporate the water in the solution, and keep the temperature for 5 hours. After the water is evaporated to dryness, stop heating immediately, add a certain proportion of water to adjust the solid content to 30wt% when the temperature is lowered to below 120°C, and stop stirring after stirring until homogeneous. The whole process was protected by nitrogen gas.

[0099] (2) Preparation of grafted catechol group prepol...

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Abstract

The invention relates to a modified PAE resin cross-linking agent, a modified adhesive and application. The modified PAE resin cross-linking agent is prepared from water, adipic acid, diethylenetriamine, a modifier and epoxy chloropropane. The embodiment of the invention provides a modified PAE resin cross-linking agent, wherein the main chain of the cross-linking agent is grafted with a catecholgroup with an adhesion function. It is accidentally found that by grafting catechol functional groups to the main chain of PAE and adopting the high-activity crosslinking technology, so that the initial viscosity of the prepared protein adhesive is remarkably improved, the pre-pressing forming time is greatly shortened, the water-resistant bonding strength is improved, and the national standard requirements are met.

Description

technical field [0001] The invention relates to an adhesive, in particular to a modified PAE resin crosslinking agent, a modified adhesive and its application. Background technique [0002] At present, the adhesives used in the wood-based panel industry are still mainly formaldehyde-based synthetic resins. The harmful gases such as free formaldehyde and phenol that volatilize during production, transportation, and use cause great harm to human health. The research and development of adhesives has been continuously strengthened, and the new biomass-based formaldehyde-free wood adhesive is expected to completely solve the problem of formaldehyde pollution. [0003] Among many biomass raw materials such as lignin, tannin, protein, starch and chitosan, soybean protein has become one of the ideal raw materials for the preparation of wood adhesives due to its advantages of abundant resources, renewable and low price. The prepared soybean protein adhesive has the advantages of sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/48C08G69/26C09J189/00C09J11/08
CPCC08G69/48C08G69/26C09J189/00C09J11/08C08L77/06
Inventor 张世锋马超余养伦刘红光
Owner BEIJING FORESTRY UNIVERSITY
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