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

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...

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