Manufacturing method of medium- and high-density flame-retardant fiber board

Abstract

The invention provides a manufacturing method of medium-high-density flame-retardant fiber board, pertaining to the technical field of board manufacture. The method is as follows: lumber is chipped and cooked to be softened and then quantitatively controlled to enter a defibrator for rapid defibrating by a helical discharge control system, a flame retardant mixture consisting of the mixing solution of carbamide, low-polyphosphate and borate is sprayed into the defibrating room of the defibrator at the pressure higher than that of the defibrator so as to eject wood fiber after the wood fiber is mixed with the flame retardant mixture, melamine modified urea formaldehyde resin adhesive is added to the wood fiber in a fiber ejecting pipe of the defibrator, and the wood fiber ejected and mixed is pressed into board by a thermocompressor after being dried, paved and shaped. The method mixes the flame retardant and the wood fiber rapidly while defibrating fiber under the condition of high temperature, high humidity, high pressure and high speed. The flame retardant is coated evenly on the surface of wood fiber cells, and ensures a uniform flame retardant effect both at interior and exterior, thus leading to a best flame retardant effect of the wood fiber.

Description

technical field [0001] The invention relates to the technical field of plate production, in particular to a production method of medium and high-density flame-retardant fiberboards. Background technique [0002] At present, medium and high-density fiberboards as furniture and decoration materials have been widely used in residences, public places and public entertainment places. In order to prevent fires and protect people's lives and property, the state has stipulated The classification of the combustion performance of flame retardant products and components has strict requirements on the combustion performance requirements and labels. At present, the flame retardants used in medium and high-density fiberboards are basically chemical flame retardants. The production and treatment methods for the flame-retardant properties of flame-retardant medium and high-density fiberboards are mainly: (1) Formulating the flame retardants into solutions , emulsion or suspension, spray th...

AI Technical Summary

Problems solved by technology

At present, the flame retardants used in medium and high-density fiberboards are basically chemical flame retardants. The production and treatment methods for the flame-retardant properties of flame-retardant medium and high-density fiberboards are mainly: (1) Formulating the flame retardants into solutions , emulsion or suspension, spray the surface of the board or immerse the board in the solution for a certain period of time, this treatment method will introduce excess water in the flame retardant solution into the board, which will affect the thickness uniformity of the board, and the board absorbs water After expansion, although it can shrink after heat drying, the expansion and contraction cannot be consistent. Spraying wet or soaking can damage the bonding strength and smoothness of the board surface, which will have a negative impact on subsequent processing such as paint, veneer, etc.; After spraying or soaking, it is necessary to further dry the board, which wastes heat energy; the board may be deformed after wet treatment and drying; (2) the flame retardant is made into a solution, emulsion or suspension and added to the medium , In the adhesive applied to the high-density fiberboard, this method is prone to uneven mixing with the adhesive, resulting in uneven application of the flame retardant and adhesive, affecting the flame retardant effect. At the same time, some chemical components of the flame retardant and the adhesive may be affected. Conduct chemical reactions that negatively impact adhesive performance and pot life

(3) At present, the flame retardants used in flame-retardant fiberboards basically contain acidic inorganic salts. The adhesive used to bond fibers is urea-formaldehyde resin adhesive. Urea-formaldehyde resin has high hygroscopicity and is easy to hydrolyze and degrade. The flame retardant is attached to The surface of the fiber acts as a barrier to the bonding of the urea-formaldehyde resin adhesive, and the acid salt in the flame retardant triggers the hydrolysis and degradation of the urea-formaldehyde resin, which affects the bonding strength of the glue, reduces the physical and mechanical properties of the board, and increases the water absorption thickness expansion rate of the board. high

(4) Some flame retardants contain halogen compounds. When flame retardant products containing halogen compounds are burned, hydrogen halides are produced, which are corrosive and harmful to human body