Production technology of flame retardant plywood

Abstract

The invention provides a production technology of a flame retardant plywood and relates to the technical field of plywood production. The production technology comprises the following steps: peeling barks from logs, annularly cutting the logs into wood sheets, and then air-drying; applying an adhesive, and coating the wood sheets with the adhesive which comprises 100-120 parts of chloroethylene-vinyl acetate resin, 10-20 parts of a flame retardant, 10-20 parts of niclosamide, 6-10 parts of a curing agent, 30-50 parts of filler, 5-9 parts of a modifier, 20-30 parts of an emulsifier and 80-100 parts of water, wherein the flame retardant comprises the following raw materials in parts by weight: 2-6 parts of antimony trichloride, 3-7 parts of chlorinated paraffin, 1-3 parts of 3-(2,6-dichlorophenyl)-5-methylisoxazole-4-carbonyl chloride and 6-10 parts of asbolane; softening the wood sheets by using a heating device to heat the wood sheets to 60-80DEG C, and then, planishing the wood sheets; replenishing the adhesive; assembling a blank; pre-pressing; trimming and hot-pressing; filling putty; and sawing edges and molding so as to obtain the polywood. The production technology is short in pre-pressing and hot-pressing time and high in production speed. The flame retardant plywood is small in internal stress, cannot easily come apart or deform as the adhesive is good in thermosetting property and high in viscosity and is good in flame retarding effect.

Description

Technical field: [0001] The invention relates to the technical field of plywood production, in particular to a production process of flame-retardant plywood. Background technique: [0002] Plywood is a three-layer or multi-layer board-like material that is made of wood sections that are peeled into veneers or sliced ​​into thin wood, and then glued with adhesives. Usually, odd-numbered veneers are used, and adjacent layers of veneers are used. The fiber directions are glued perpendicular to each other. The adhesives used in the production of plywood generally use more thermosetting adhesives. Some adhesives have poor thermosetting properties, and the thermosetting process takes a long time, which is called insufficient viscosity. Especially when the temperature is high, the viscosity is greatly reduced. It is beneficial to the forming of plywood. The strength of plywood after forming is insufficient, and the flame retardant effect of plywood adhesive is poor and easy to bur...

AI Technical Summary

Problems solved by technology

The adhesives used in the production of plywood generally use more thermosetting adhesives. Some adhesives have poor thermosetting properties, and the thermosetting process takes a long time, which is called insufficient viscosity. Especially when the temperature is high, the viscosity is greatly reduced. It is beneficial to the forming of plywood, the strength of plywood after forming is insufficient, the flame retardant effect of plywood adhesive is poor, and it is easy to burn

In addition, in the prior art, the wood chips are generally not very smooth, and are all curled, especially for some wood chips of hard trees, the curled wood chips are not easy to lay and arrange, and are not convenient for later stage suppression. Forming, and the gluing in the prior art is one-time gluing, which is not only uneven, but also the rubber material is too dry before pressing, which is not conducive to pressing and forming. Slow, and the internal stress is also large, easy to deform and open glue