Waterproof and suncare straw wood composite high density fiberboard and preparation method thereof

Abstract

The invention discloses a waterproof and suncare straw wood composite high density fiberboard. The waterproof and suncare straw wood composite high density fiberboard is characterized by being prepared by the following raw materials in parts by weight: 42-45 of crop straws, a proper amount of sodium hydroxide with a concentration of 2%, 2-2.5 of silane coupling agents kh450, 66-70 of ethanol with a concentration of 95%, 30-32 of wood leftovers, 3-4 of methyl sodium silicate, 3-5 of nanometer titanium dioxide, 7-8 of waterborne polyurethane adhesive, 1.5-2 of microcrystalline wax, 0.03-0.05 of ammonium persulfate, 2-3 of methacrylate, and a proper amount of water. The methyl sodium silicate is added when fibers are treated in the formula, the methacrylate, the microcrystalline wax and the like are added when the fibers are glued, and the raw materials coact to greatly enhance the product water resistance and to prevent the corrosion caused by water seepage; and meanwhile, the suncare nanometer titanium dioxide is added, so that the produced product can replace a plastic board or a wood board, or even can be used outdoors.

Description

technical field [0001] The invention relates to the technical field of deep processing of wood materials, in particular to a waterproof and sun-resistant straw-wood composite 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 ...

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.