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Cross-linking agent for bio-based adhesive and preparation method of cross-linking agent

A kind of adhesive, bio-based technology, applied in the field of crosslinking agent and its preparation, to achieve the effect of good hot water resistance adhesive performance

Active Publication Date: 2020-02-14
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN102911356B discloses that malic acid or tartaric acid is used instead of adipic acid to prepare a linear PAE polymer aqueous solution and use it as a protein glue crosslinking agent, but its hot pressing temperature also requires a high temperature of 140°C

Method used

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  • Cross-linking agent for bio-based adhesive and preparation method of cross-linking agent
  • Cross-linking agent for bio-based adhesive and preparation method of cross-linking agent
  • Cross-linking agent for bio-based adhesive and preparation method of cross-linking agent

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Embodiment 1

[0024] The cross-linking agent of the present embodiment is to take melamine, adipic acid, diethylenetriamine, epichlorohydrin as main raw materials, by including the following major steps:

[0025] (1) Mix 100 g of melamine and 350 g of adipic acid, heat to 180° C. and react for 120 min, and cool to room temperature to obtain polycondensed tribasic acid;

[0026] (2) Add 200g of diethylenetriamine to the above-mentioned tribasic acid, heat to 170°C and react for 120min, and cool to 60°C to obtain an acid amine polycondensation intermediate;

[0027] (3) Add 800g of water to the above acid amine polycondensation intermediate until dissolved, adjust the pH to 8 with ammonia water, add 190g of epichlorohydrin dropwise at 60°C for 240min, and cool to room temperature to obtain a crosslinking agent solution.

Embodiment 2

[0029] With embodiment 1, wherein replace 200g diethylene triamine with 280g triethylene tetramine.

Embodiment 3

[0031] With embodiment 1, wherein replace 350 gram adipic acids with 250 g malonic acid.

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Abstract

The invention discloses a cross-linking agent for a bio-based adhesive and a preparation method of the cross-linking agent. The method comprises the following steps: firstly, carrying out acid amine dehydration condensation reaction on melamine and a binary acid under the condition of 170-190 DEG C to obtain a polycondensed triacid; carrying out dehydration condensation reaction on the polycondensed triacid and a polyethylene polyamine at 160-180 DEG C to obtain an acid amine polycondensation intermediate; dissolving the acid amine polycondensation intermediate in water, regulating the pH value to 7-10, and dropwisely adding epoxy chloropropane at 50-70 DEG C to react, thereby obtaining the cross-linking agent for the bio-based adhesive. When the cross-linking agent is added into the formaldehyde-free albumen glue, the heat curing temperature of protein can be reduced from 130 DEG C or above to 85 DEG C, and meanwhile, the albumen glue is provided with relatively good hot water resistance and adhesion performance.

Description

technical field [0001] The invention relates to a crosslinking agent for bio-based adhesives and a preparation method thereof, belonging to the technical field of crosslinking agent preparation. Background technique [0002] For many years, urea-formaldehyde glue has been a chemically synthesized adhesive widely used in industry, such as in wood processing, clothing processing, etc., especially in wood-based panel processing. Formaldehyde will be released during the production and application of urea-aldehyde glue, and during the use of its products, and even the formaldehyde release period in wood-based panels can last as long as 15 years. Wood-based panels are an essential material for interior decoration, causing formaldehyde to become the first major indoor pollutant, seriously threatening people's physical and mental health. With the continuous improvement of people's living standards and the continuous enhancement of health and environmental protection awareness, the ...

Claims

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Application Information

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IPC IPC(8): C07D251/70C09J189/00C09J11/06
CPCC07D251/70C09J189/00C09J11/06C08K5/34922
Inventor 蒋梦琪俞马宏高瞩赵志仁
Owner NANJING UNIV OF SCI & TECH
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