Method for manufacturing ultra-low formaldehyde emission medium-to-high density fiberboard

A high-density fiberboard, formaldehyde emission technology, applied in the direction of manufacturing tools, flat products, pretreatment of molding materials, etc., can solve the problems of appearance defects, high cost, differences in physical properties of the board, etc., to achieve good air quality and preparation process Simple, easy-to-buy effects

Active Publication Date: 2014-01-08
GUANGXI SUNWAY FOREST PROD IND
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a method for manufacturing medium and high-density fiberboard with ultra-low formaldehyde emission, which can solve the problem of high cost and easy to cause differences in the physical properties of the board when using ammonia fumigation to reduce formaldehyde after the existing medium-high-density fiberboard is finished. and appearance defects

Method used

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  • Method for manufacturing ultra-low formaldehyde emission medium-to-high density fiberboard

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Experimental program
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Effect test

Embodiment 1

[0039] Preparation of Ultra E0 Adhesive:

[0040] A. Add 1000 parts of formaldehyde into the reaction kettle, adjust the pH to 8.7 with 9.8 parts of sodium hydroxide, and add 2.1 parts of polyvinyl alcohol after 10 minutes to form solution A;

[0041] B. When the temperature rises to 30-35°C, add 376 parts of urea and 28.7 parts of melamine to solution A, raise the temperature to 88-92°C within 30-60 minutes, and keep the temperature at 88-92°C for 30 minutes. Obtain solution B;

[0042] C. Slowly add 7.8 parts of formaldehyde to solution B, adjust the pH value to 5.8, and control the temperature at 88-90°C to react, when the viscosity reaches 20.3 seconds / 30°C as the end point, solution C is obtained;

[0043] D. Add 2.6 parts of triethanolamine to solution C, adjust the pH value to 7.4 with 5.7 parts of sodium hydroxide, add 190 parts of urea and 12.3 parts of melamine, and react at a temperature of 80-85°C for 30 minutes to obtain solution D;

[0044] E. Add 7.3 part...

Embodiment 2

[0061] Preparation of Ultra E0 Adhesive:

[0062] A. Add 1000 parts of formaldehyde into the reaction kettle, adjust the pH to 8.5 with 9 parts of sodium hydroxide, and add 2.5 parts of polyvinyl alcohol after 10 minutes to form solution A;

[0063] B. When the temperature rises to 30-35°C, add 368 parts of urea and 26.6 parts of melamine to solution A, raise the temperature to 88°C within 45 minutes, and keep the temperature at 88-92°C for 30 minutes to obtain solution B;

[0064] C. Slowly add 6.2 parts of formic acid to solution B, adjust the pH value to 6.3, and control the temperature at 88-92°C to react, when the viscosity reaches 21 seconds / 30°C as the end point, solution C is obtained;

[0065] D. Add 2.1 parts of triethanolamine to solution C, adjust the pH value to 7.2 with 5.8 parts of sodium hydroxide, add 191 parts of urea and 11.4 parts of melamine, and react at a temperature of 83-85°C for 30 minutes to obtain solution D;

[0066] E. Add 7.0 parts of sodiu...

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Abstract

The invention discloses a method for manufacturing an ultra-low formaldehyde emission medium-to-high density fiberboard, and relates to the technical field of chemical engineering. The method comprises the steps of timber chipping, washing, stewing, softening, grinding the chipped timber into a fiber in a hot mode, adding a mixed curing agent of a super E0 tackiness agent, urea and ammonium chloride, drying, winnowing, paving and forming, hot-pressing, cross sawing, cooling, sanding, edge cutting and identifying and packaging a sawn stock board according to the demand. In the process of manufacturing the fiberboard, the mixed curing agent of the super E0 tackiness agent, the urea and the ammonium chloride is added, the formaldehyde emission conforms to the standard, and ammonia smoking can be carried out without additionally installing equipment so that the problems that investment is increased and power is consumed cannot happen; the problems that the physical properties of the fiberboard are poor and the appearance of the fiberboard is defective do not exist, and ammonia gas and other pungent smells cannot be produced.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for manufacturing medium and high density fiberboards with ultra-low formaldehyde emission. Background technique [0002] After using ordinary E0-level adhesives to produce and sand the finished medium and high-density fiberboards, the formaldehyde emission is about 4.0~5.0mg / 100g (extraction method) or 0.4~0.5mg / L (dryer method); and then passed through liquid ammonia or Gaseous ammonia is fumigated in a closed environment, so that the formaldehyde emission of medium and high density fiberboard reaches 2.0~3.0mg / 100g (extraction method) or 0.2~0.3mg / L (dryer method); [0003] This technique has the following disadvantages: [0004] 1) To reduce formaldehyde by ammonia fumigation, special ammonia fumigation equipment needs to be added, which increases investment and power consumption; [0005] 2) The ammonia fumigation method is easy to cause appearance defec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N1/02B27N3/12B27N3/18B27M1/08
Inventor 陈仲炯陆美莲石志锋何红兵
Owner GUANGXI SUNWAY FOREST PROD IND
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