High-density fiberboard with absorption performance enhanced by adding modified paper sludge and preparation method thereof

Abstract

The invention discloses a high-density fiberboard with absorption performance enhanced by adding modified paper sludge. The high-density fiberboard is characterized by being prepared from the following raw materials including, by weight, 42-45 parts of crop straw, an appropriate amount of sodium hydroxide with the concentration of 2%, 30-32 parts of wood scraps, 2-2.5 parts of silane coupling agents kh450, 66-70 parts of ethanol with the concentration of 95%, 9-11 parts of the paper sludge, 1-2 parts of sodium bicarbonate, 1-2 parts of carboxymethylcellulose, 7-8 parts of waterborne polyurethane adhesive, 1.5-2 parts of emulsifying paraffin and an appropriate amount of water. The high-density fiberboard is a resource substitute product. According to the high-density fiberboard, a large amount of crop straw, wood scraps, paper sludge and other components are used; waste is utilized, and the sources are wide, so that the wood resource is saved. The process is improved on the basis of a traditional process; industrial control is convenient; the production efficiency is improved; in addition, the quality stability of the fiberboard can be improved. The process is a fiberboard preparation technique with good application prospects.

Description

technical field [0001] The invention relates to the technical field of deep processing of wood materials, in particular to a high-density fiberboard which is added with modified papermaking sludge to enhance adsorption performance 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 utili...

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.