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Fibre flame-retardant processing method for flame-retardant medium-density fiberboard

A flame retardant treatment, fiberboard technology, applied in the pretreatment of molding materials, flat products, household components, etc., can solve the problems of increasing the fiber drying load and reducing the flame retardant effect, so as to improve the flame retardant effect, reduce the dosage, Avoid the effects of thermal decomposition

Inactive Publication Date: 2009-04-22
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the defects that some flame retardants that exist in the flame retardant treatment of fibers in the production process of flame retardant MDF will produce thermal degradation during the fiber drying process, reduce the flame retardant effect and increase the fiber drying load and other defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Mixed flame retardants are mainly inorganic salts, containing phosphorus, nitrogen, ammonium, boron and other substances. The two elements of phosphorus and nitrogen can play a significant synergistic effect in the flame retardant to improve the flame retardant effect, and the price is low. Its components and ratio are ammonium dihydrogen phosphate: ammonium sulfate: boric acid: borax = 4:3:2:1.

[0020] Application amount of the mixed flame retardant: the ratio of the mixed flame retardant to the absolute dry fiber is 6% to 14%.

[0021] The decomposition temperature of each component in the mixed flame retardant is as follows: ammonium dihydrogen phosphate is a colorless crystalline powder, which begins to decompose when heated to 155°C; ammonium sulfate has stable physical properties, and its decomposition temperature is greater than 280°C; White crystalline powder, loses all crystal water when heated to 380°C; boric acid begins to decompose and lose water molecules ...

example 2

[0024] The mixed flame retardant adopts phosphorus-nitrogen composite organic flame retardant mainly composed of APP (polyphosphate amine), and other components are ammonium sulfate and boric acid. The ratio of each component is APP (ammonium polyphosphate):ammonium sulfate:boric acid=5:3:2. The application amount of the mixed flame retardant accounts for 6%-14% of the absolute dry fiber.

[0025] APP (ammonium polyphosphate) is a white powder with high phosphorus and nitrogen content, good flame retardant effect, and its decomposition temperature is greater than 285°C. The decomposition temperature of ammonium sulfate is also greater than 280°C. When boric acid is heated to 100-105°C, it begins to decompose and lose water molecules.

[0026] According to the decomposition temperature of each component in the mixed flame retardant and the fiber drying temperature, APP (ammonium polyphosphate) and ammonium sulfate with a decomposition temperature higher than 170°C are divided...

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Abstract

The invention discloses a method for flame retardant treatment of a fiber to produce a flame retardant medium density fiberboard. The method is characterized in that a mixed flame retardant is adopted to perform flame retardant treatment on the fiber, and each component in the mixed flame retardant is applied by two times according to the decomposition temperature which is higher or lower than the fiber drying temperature. The method comprises the following steps: firstly, applying the component the decomposition temperature of which is higher than the fiber drying temperature to the fiber from a discharging opening of a prefiner; and secondly, preparing the component the decomposition temperature of which is lower than the fiber drying temperature into powder, and applying the component to fiber flow from a discharging opening of a storage bin after the fiber is dried. The method for the flame retardant treatment of the fiber not only cannot increase the burden of a fiber drier, but also can prevent certain flame retardant with lower decomposition temperature from being decomposed in the process of drying the fiber, thus the usage of the flame retardant is reduced, the flame retardant effect is improved, and the modern continuous production process of the medium density fiberboard is not changed.

Description

technical field [0001] The invention relates to a production method of a flame-retardant medium-density fiberboard, in particular to a method for performing flame-retardant treatment on fibers during the production process of the flame-retardant medium-density fiberboard. Background technique [0002] Flame-retardant MDF can be widely used in construction, interior decoration, furniture, vehicles, ships and other occasions that have special requirements for fire protection. At present, the flame retardant treatment methods for medium density fiberboard can be divided into two types: the flame retardant treatment of finished boards and the flame retardant treatment of fibers in the production process. [0003] 1. Flame retardant treatment of the finished board: there are two methods of dipping the finished board and brushing the board surface. [0004] (1) Impregnation treatment of the finished board: put the finished board in the flame retardant solution, soak it under norm...

Claims

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Application Information

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IPC IPC(8): B27N1/00B27N3/00
Inventor 王宝金朱典想丁建文颜宏伟
Owner NANJING FORESTRY UNIV
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