Preparation method for biological oil-phenol-starch adhesive

A starch adhesive, bio-oil technology, applied in the directions of starch-derived adhesives, adhesive types, etc., can solve the problems of high hot-pressing temperature, long curing time, high price, etc., and achieves mature preparation technology, low environmental damage, The effect of easy access to equipment

Active Publication Date: 2012-05-23
BEIJING FORESTRY UNIVERSITY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] However, the above several water-resistant starch-based wood adhesives are relatively complicated in terms of preparation process; in terms of auxiliary agents for production, most of them must rely on expensive polyisocyanates that are highly toxic during use; Depending on the conditions of use, or the hot pressing temperature is high, or the active period is short, or the curing time is long

Method used

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preparation example Construction

[0026] The preparation method of the biological oil-phenol-starch adhesive that the present invention proposes comprises the following steps:

[0027] (1) preparation of dialdehyde starch acetate:

[0028] Starch and water are prepared into a starch emulsion with a mass percentage concentration of 35% to 40%, and sodium periodate solution is added to the starch emulsion, and the added molar ratio is: starch: sodium periodate=1: 1.1, adjusted with hydrochloric acid The pH value of the starch emulsion is 1.2 to 1.5, the temperature is raised to 35°C to 40°C, and the heat preservation reaction is carried out for 3 hours to obtain the dialdehyde starch solution. The dialdehyde starch solution is suction filtered, washed, and dried at 40°C for 2 to 3 hours. Obtain dialdehyde starch;

[0029] The prepared dialdehyde starch and water are prepared into a dialdehyde starch emulsion with a mass percentage concentration of 40%-50%, adding glacial acetic acid, the mass ratio of adding is...

Embodiment 1

[0043] (1) preparation of dialdehyde starch acetate:

[0044] Starch and water are mixed with the starch emulsion that mass percent concentration is 35%, add sodium periodate solution in starch emulsion, the mol ratio of adding is: starch: sodium periodate=1: 1.1, adjust the starch emulsion with hydrochloric acid The pH value is 1.4, the temperature is raised to 37°C, and the temperature is kept for 3 hours to obtain a dialdehyde starch solution. The dialdehyde starch solution is filtered, washed, and dried at 40°C for 3 hours to obtain the dialdehyde starch;

[0045] Prepared dialdehyde starch and water are mixed with the dialdehyde starch emulsion that the mass percentage concentration is 50%, add glacial acetic acid, the mass ratio of adding is: dialdehyde starch: glacial acetic acid=4: 1, mix and stir for 2 minutes, Cold acetic anhydride was gradually added to the starch emulsion within 5 minutes. The molar ratio added was: dialdehyde starch: cold acetic anhydride=1:1. Met...

Embodiment 2

[0058] (1) preparation of dialdehyde starch acetate:

[0059] Starch and water are mixed with the starch emulsion that mass percent concentration is 40%, add sodium periodate solution in starch emulsion, the mol ratio of adding is: starch: sodium periodate=1: 1.1, adjust the starch emulsion with hydrochloric acid The pH value is 1.4, the temperature is raised to 37°C, and the temperature is kept for 3 hours to obtain a dialdehyde starch solution. The dialdehyde starch solution is filtered, washed, and dried at 40°C for 3 hours to obtain the dialdehyde starch;

[0060] Prepared dialdehyde starch and water are mixed with the dialdehyde starch emulsion that the mass percentage concentration is 50%, add glacial acetic acid, the mass ratio of adding is: dialdehyde starch: glacial acetic acid=4: 1, mix and stir for 2 minutes, Cold acetic anhydride was gradually added to the starch emulsion within 5 minutes. The molar ratio added was: dialdehyde starch: cold acetic anhydride=1:1. Met...

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Abstract

The invention relates to a preparation method for a biological oil-phenol-starch adhesive, belonging to the technical field of artificial boards in the field of wood processing. The preparation method comprises the following steps of: firstly, making biological oil which partially replaces phenol react with oxidized starch acetate to prepare biological oil-phenol-starch resin; then preparing a starch-based cross-linking agent; and finally mixing the starch-based cross-linking agent and the biological oil-phenol-starch resin in a certain proportion and adding curing agent of isocyanate to prepare the biological oil-phenol-starch adhesive. The biological oil-phenol-starch adhesive has the advantages of no formaldehyde release, good water tolerance and the like, is biodegradable and can be used for the field of boards for family decoration.

Description

technical field [0001] The invention relates to a preparation method of a bio-oil-phenol-starch adhesive, which belongs to the technical field of wood-based panels in wood processing. technical background [0002] In recent years, with the promulgation of national environmental protection regulations and the enhancement of people's awareness of environmental protection, the country's restrictions on the volatilization of free formaldehyde in acetal adhesives have become more and more stringent, and most of the boards used in indoor furniture and interior decoration use urea-formaldehyde Such adhesives have a large amount of formaldehyde volatilization and are more harmful to the human body and the environment. Therefore, it is urgent to develop a formaldehyde-free adhesive for indoor furniture panels. Among them, starch adhesives have the most potential for development. [0003] At present, various research and improvement methods have been proposed for starch adhesives at h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J103/06C08B31/04
Inventor 常建民夏碧华张继宗
Owner BEIJING FORESTRY UNIVERSITY
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