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Adhesive and preparation method thereof as well as application of adhesive in vegetable fiberboard or artificial board

A technology of adhesives and mixtures, applied in the direction of adhesives, adhesive additives, inorganic adhesives, etc., can solve the problems of restricting the development of plant fiber boards, high cost of board bonding, and large energy consumption in the forming stage, etc., to achieve dimensional stability, Easy to prepare and ensure the effect of environmental performance

Active Publication Date: 2015-03-25
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, part of the crop straw resources have been used to produce plant fiber boards. Because isocyanates are widely used as adhesives in the existing plant fiber boards, their prices are expensive, resulting in high bonding costs for the boards. Combustion, moisture absorption, high energy consumption in the forming stage and other technical problems, which further restrict the development of the plant fiberboard industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0038] A kind of adhesive, it is formulated by the component of following mass parts:

[0039] Sodium silicate aqueous solution: 50-60 parts; the modulus of the solute sodium silicate in the sodium silicate aqueous solution is 2.8-3.2;

[0040] Brine: 10 to 20 parts; brine is a mixed solution of magnesium chloride and magnesium sulfate, and the mass ratio of magnesium chloride and magnesium sulfate in the brine is 3:1, and the total mass concentration of magnesium chloride and magnesium sulfate in the brine is 8%; magnesium chloride generally uses six Water Magnesium chloride hydrate, and magnesium sulfate choose MgSO 4 Magnesium sulfate heptahydrate with content >97%;

[0041] Nano-silica: 20-30 parts; the purity of nano-silica is greater than 99.99%, and the moisture content is less than 0.01%;

[0042] Filler: 6-8 parts; the filler is a mixture formed by mixing copper oxide, magnesium oxide and aluminum oxide at a mass ratio of 2:1:1; magnesium oxide is 85% lightly burned...

Embodiment 1

[0055] A kind of adhesive of the present invention, it is formulated by the component of following mass fraction:

[0056] Sodium silicate aqueous solution: 50g; the modulus of the solute sodium silicate in the sodium silicate aqueous solution is 2.8;

[0057] Brine: 10g; brine is a mixed solution of magnesium chloride and magnesium sulfate, and the molar ratio of magnesium chloride and magnesium sulfate in the brine is 3:1, and the total mass concentration of magnesium chloride and magnesium sulfate in the brine is 8%; magnesium chloride is magnesium chloride hydrate hexahydrate , while magnesium sulfate chooses MgSO 4 Magnesium sulfate heptahydrate with content >97%;

[0058] Nano silicon dioxide: 20g; the purity of nano silicon dioxide is greater than 99.99%, and the moisture content is less than 0.01%;

[0059] Filler: 6g; filler is a mixture formed by mixing copper oxide, magnesium oxide and aluminum oxide at a mass ratio of 3:1:1; magnesium oxide is 85% lightly burned ...

Embodiment 2

[0071] A kind of adhesive of the present invention, it is formulated by the component of following mass fraction:

[0072] Sodium silicate aqueous solution: 55g; the modulus of the solute sodium silicate in the sodium silicate aqueous solution is 3.0;

[0073] Brine: 15g; the brine is a mixed solution of magnesium chloride and magnesium sulfate, and the molar ratio of magnesium chloride and magnesium sulfate in the brine is 3:1, and the total mass concentration of magnesium chloride and magnesium sulfate in the brine is 8%; magnesium chloride is magnesium chloride hydrate hexahydrate , while magnesium sulfate chooses MgSO 4 Magnesium sulfate heptahydrate with content >97%;

[0074] Nano silica: 25g; the purity of nano silica is greater than 99.99%, and the moisture content is less than 0.01%;

[0075] Filler: 7g; filler is a mixture formed by mixing copper oxide, magnesium oxide and aluminum oxide at a mass ratio of 2:1:1; magnesium oxide is 85% lightly burned magnesium oxid...

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PUM

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Abstract

The invention discloses an adhesive, which is mainly prepared from the following components in parts by weight: 50-60 parts of a sodium silicate solution, 10-20 parts of brine, 20-30 parts of nanosilicon dioxide, 6-8 parts of packing, 0.4-0.6 part of a modifying agent and 0.1-0.3 part of a stabilizer. The preparation method comprises the following steps: firstly mixing and dissolving magnesium chloride and magnesium sulfate at a certain molar ratio, and stirring to obtain brine; adding the sodium silicate solution to the prepared brine and adding the nanosilicon dioxide to the prepared sodium silicate-brine mixture, so as to obtain a mixture; adding the packing to the mixture, and stirring evenly, so as to obtain a semi-finished product; and adding the modifying agent and the stabilizer to the semi-finished product, so as to obtain an adhesive product. The adhesive disclosed by the invention can be applied to the vegetable fiberboard or the artificial board as an inorganic adhesive, does not release pollutants, and is low in cost; and the strength, the fire resistance and the water tolerance of the product can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of wood adhesives, in particular to an adhesive and its preparation method and application. Background technique [0002] my country's forest coverage rate only accounts for 61.3% of the world's forest coverage rate, ranking 139th in the world. The per capita forest area in China is equivalent to 21.3% of the world's per capita forest area, and the per capita forest stock volume is only 1 / 8 of the world's per capita forest stock volume. The national forest coverage rate is only 16.5%. Obviously, my country is a country with very scarce forest resources. Therefore, it is imminent to comprehensively develop and utilize other biomass resources to replace forest resources. [0003] As a large agricultural country, my country has a huge output of plant fiber represented by crop straw, with wide distribution and many types. The annual output of crop straw is about 700 million tons, and only about 2.5% can be u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J1/02C09J11/04
Inventor 吴义强卿彦刘晓梅李新功张新荔
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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