Method for manufacturing environment-friendly medium density fiberboard using plant straws instead of partial wood fibers

Abstract

The invention discloses a method for manufacturing an environment-friendly medium density fiberboard using plant straws instead of partial wood fibers. The fiberboard is composed of the following components in parts by weight: 60-70 parts of wood materials, 20-25 parts of plant straws, 15-20 parts of urea resin, 4-6 parts of methylenediphenyl diisocyanate adhesive, 0.8-1.2 parts of paraffin, 0.2-0.3 part of caustic soda flakes, 0.2-0.3 part of formic acid, 0.25-0.3 part of ammonia chloride, and 0.15-0.2 part of melamine. The method for manufacturing an environment-friendly medium density fiberboard using plant straws instead of partial wood fibers has the following advantages: the usage amount of wood is reduced; moreover, as the methylenediphenyl diisocyanate (MDI) is a non-formaldehyde adhesive, the addition thereof results in great reduction of formaldehyde emission of the density fiberboard, improvement in the environmental protection property of the density fiberboard, and promotion of the production level and the product quality, and also promotion of technical innovation, process innovation and product innovation with respect to artificial board products.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing medium density boards. Background technique [0002] The wood-based panel industry is an important industry that efficiently utilizes wood resources and an important means to realize the sustainable development strategy of forestry. In the current situation that the world's recoverable forest resources are decreasing day by day, making full use of resources such as forestry "residues", "sub-small fuelwood", artificial fast-growing and high-yield commercial forests, and crop straws to develop wood-based panels to replace large-diameter timber products is of great importance It plays an irreplaceable role in protecting natural forest resources, protecting the environment, and meeting the needs of economic construction and social development for forest products. Due to the reduction of forest resources in recent years, their prices have also continued to ris...

AI Technical Summary

Problems solved by technology

The key technical problems to be solved are: first, what kind of adhesive to choose to solve the problem of high silica and wax content in the straw, which makes it difficult to glue; second, how much plant straw is added to meet the mechanical properties of the product without affecting it. The third is how to effectively heat-grind the straw fibers to prepare qualified fiber raw materials; the fourth is to solve the problem that the high water absorption thickness expansion rate of the straw fibers may lead to slightly poor dimensional stability of the product; the specific technical solutions are as follows:

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