Formaldehyde-free-grade high-quality and high-density fiberboard and preparation method thereof

Abstract

The invention discloses a formaldehyde-free-grade high-quality and high-density fiberboard. The formaldehyde-free-grade high-quality and high-density fiberboard is characterized by being prepared from, by weight, 42-45 parts of crop straw, an appropriate amount of sodium hydroxide with the concentration of 2%, 2-2.5 parts of a silane coupling agent kh450, 66-70 parts of ethyl alcohol with the concentration of 95%, 30-32 parts of timber leftover materials, 4-6 parts of diatom ooze, 3-4 parts of nanometer tourmaline powder, 5-6 parts of waterborne polyurethane adhesives, 1.5-2 parts of solid paraffin, 2-3 parts of soybean protein glue, 1-2 parts of polysorbate 80, 2-3 parts of urea and an appropriate amount of water. The technology is obtained by conducting innovation on the basis of an existing technology, the production cost can be reduced, the production efficiency can be improved, and the quality stability of the fiberboard can be improved. By means of waste materials such as straw of crops and wheat, environment pollution can be reduced, and the high added value of the product can be increased, for example, anion release and the adsorption effect; and the high-strength, high-quality and formaldehyde-free environment-friendly fiberboard is prepared.

Description

technical field [0001] The invention relates to the technical field of deep processing of wood materials, in particular to a formaldehyde-free high-quality high-density fiberboard and a preparation method thereof. Background technique [0002] In recent years, my country's medium and high density fiberboard industry has developed very rapidly, and the original hard fiberboard has been gradually replaced by medium and high density fiberboard. MDF enterprises are very dependent on wood raw materials. The cost of wood raw materials accounts for about 45% of the production cost. The shortage of wood raw materials has seriously affected the production of fiberboards. As far as the production requirements of medium and high density fiberboard are concerned, it is more than 10 years, the regeneration cycle of bamboo is also 3-5 years, and the regeneration cycle of crop straw is 1 year or less. From the perspective of resource utilization efficiency, crops Straw is the most benefic...

AI Technical Summary

Problems solved by technology

However, the herbaceous plant fibers represented by crops are short and thin, which limits the mechanical strength of the grass fiberboard to a certain extent.

The content of organic solvent extracts from herbaceous plant stems is significantly lower than that of wood raw materials, but the main component is waxy, accompanied by a small amount of higher fatty acids, higher alcohols, etc., plus the degree of silicification of grass stems and leaf epidermal cells Very high, the waxy layer and silica content on the surface of the straw are high, which is not conducive to the infiltration of the adhesive, resulting in poor adhesion of the traditional urea-formaldehyde resin to the straw scraps

This requires that when using herbaceous plant fibers such as crop straws to manufacture high-density fiberboards, the defects of poor bonding, poor water resistance, and poor strength of traditional adhesives in the existing process must be solved.