Method for preparing formaldehyde-free fiberboard using dialdehyde cellulose

Abstract

The present invention discloses a method for preparing a formaldehyde-free fiberboard using dialdehyde cellulose and belongs to the technical field of fiberboard production. According to the invention, the dialdehyde cellulose is mixed with straw pellets under a condition of 160-190 DEG C for subsequent hot-pressing molding, where 0.5%-20% of dialdehyde cellulose and the balance of the straw pellets are used. According to the invention, the dialdehyde cellulose having highly active aldehyde groups is used as an adhesive to crosslink the straw pellets such that the prepared fiberboard is formaldehyde-free and has good physical properties. According to the invention, by using agricultural straws as the major raw materials instead of wood, resource waste and environmental pollution due to a large quantity of burnt agricultural straws in China may be effectively solved while the production cost is reduced. Furthermore, according to the invention, raw materials for synthesizing the dialdehyde cellulose are widely available and moderately priced, and a synthesis process for the dialdehyde cellulose is simple with short synthesis time, and thus is conducive to industrial production.

Description

Technical field [0001] The invention relates to a method for preparing a fiberboard, in particular to a method for preparing a formaldehyde-free fiberboard by using dialdehyde cellulose. Background technique [0002] Fiberboard is an excellent building material due to its high strength coefficient and good electrical insulation, and it has been widely produced in many parts of the world. Since the new century, the average annual growth rate of man-made fiberboard in my country has exceeded 20%, and it has become the world's largest producer and consumer of man-made fiberboard. In 2014, the output of my country's man-made fiberboard reached 30,123,300 cubic meters, an increase of 11% year-on-year. In the future, the product structure of the man-made fiberboard industry will become more reasonable, product quality will steadily improve, low-quality products will gradually withdraw from the market, and product prices will become more reasonable. Urea Formaldehyde Resin (UF), Pheno...

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Problems solved by technology

[0005] US 2013 / 8378056B2 "Formaldehyde-free Binders" (Formaldehyde-free Binders), US2011 / 0009530 A1 "Formaldehyde-free Binders for Producing Wood Products" (formaldehyde-free Binders for Producing Wood Products), German patent publication GER 1994 / DE4308089 A1 "Formaldehyde-free binders for wood" (Formaldehyde-free binders for wood), domestic patent publications CN1899783A "A method for producing boards using crop straws", CN101085532A "Formaldehyde-free fiberboard manufacturing process" are all on formaldehyde-free fiberboards Exploratory applications have been carried out, but there are still some defects in the selection and processing of raw materials, the selection and modification of adhesives, and the production cost is relatively high. The bonding strength, water resistance and dimensional stability of some plates There are still some deficiencies in all aspects, which limit its wider application.

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