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Preparation method of formaldehyde-free flame retardant fiberboard

A flame-retardant, fiberboard technology, applied in flat products, household components, applications, etc., can solve the problems of poor performance and high cost of starch adhesives, and achieve the effects of good dispersion, low cost and high bonding strength

Active Publication Date: 2018-01-16
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the hidden safety hazards of the existing formaldehyde-containing fiberboard, and at the same time solve the defects of high cost and poor performance of starch adhesives, and provide a method for preparing formaldehyde-free flame-retardant fiberboard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a formaldehyde-free flame-retardant fiberboard, comprising the following steps:

[0032] (1) Preparation of dialdehyde starch by solid-phase activation: dry tapioca starch to a water content of 5%, and then add sodium periodate with 0.5% tapioca starch quality to a ball mill for ball milling. The amount of zirconium balls is twice the volume of tapioca starch , during the ball milling process, 0.25% of the mass of tapioca starch magnesium sulfate was added. The temperature of the ball mill was 40°C, the rotation speed was 300 r / min, and the time was 30 min. After the ball milling was completed, dialdehyde starch was obtained;

[0033] (2) Preparation of dialdehyde starch adhesive: Dissolve dialdehyde starch in water with 1.5 times the weight of dialdehyde starch, add dropwise sodium hydroxide solution to adjust the pH value to 8.5, add urea with 0.07 times the weight of dialdehyde starch, Stir at 400 rpm for 25 min for addition reaction, then add ...

Embodiment 2

[0036] A method for preparing a formaldehyde-free flame-retardant fiberboard, comprising the following steps:

[0037](1) Preparation of dialdehyde starch by solid-phase activation: dry cornstarch to a water content of 7%, and then add sodium periodate with 1.0% cornstarch quality to a ball mill for ball milling, and the amount of zirconium balls is 1 times the volume of cornstarch , during the ball milling process, magnesium chloride with 1% cornstarch quality was added, the temperature of the ball milling was 60°C, the rotation speed was 600 r / min, and the time was 10 min, and the dialdehyde starch was obtained after the ball milling was completed;

[0038] (2) Preparation of dialdehyde starch adhesive: Dissolve dialdehyde starch in water with 1 times the weight of dialdehyde starch, add dropwise sodium hydroxide solution to adjust the pH value to 9.5, add urea with 0.08 times the weight of dialdehyde starch, Stir at 500 rpm for 20 min for addition reaction, then dropwise ad...

Embodiment 3

[0041] A method for preparing a formaldehyde-free flame-retardant fiberboard, comprising the following steps:

[0042] (1) Preparation of dialdehyde starch by solid-phase activation: dry potato starch to a water content of 3%, and then add sodium periodate with 0.5% potato starch quality to a ball mill for ball milling, and the amount of zirconium balls is 3 times the volume of potato starch , during the ball milling process, 3% magnesium nitrate of potato starch quality was added, the temperature of the ball mill was 60°C, the speed of the ball mill was 300 r / min, and the time was 20 min. Dialdehyde starch was obtained after the ball milling was completed;

[0043] (2) Preparation of dialdehyde starch adhesive: Dissolve dialdehyde starch in water with twice the mass of dialdehyde starch, add dropwise sodium hydroxide solution to adjust the pH value to 10, add 0.03 times the mass of dialdehyde starch phenol, at 80°C, Stir at 300 rpm for 30 min for addition reaction, then add h...

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Abstract

The invention relates to the technical field of resource utilization of starch and fiber wastes, and specifically relates to a preparation method of a formaldehyde-free flame retardant fiberboard. Thepreparation method comprises the following steps: adding starch, sodium periodate, and magnesium salts into a ball mill to carry out solid phase activation to prepare dialdehyde starch; then mixing dialdehyde starch with a glue making aid to prepare a dialdehyde starch adhesive; mixing the dialdehyde starch adhesive with fiber wastes, and pressing the mixture in a vulcanizing press to obtain theformaldehyde-free flame retardant fiberboard. The dialdehyde starch is prepared by solid phase mechanical active oxidation reactions, the using amount of sodium periodate is little, and the oxidationreaction efficiency is high. The aldehyde group of dialdehyde starch reaches 1.15-2.45. The solubility reaches 40-50 g / 100g water. The prepared dialdehyde starch adhesive has the advantages of low cost, good dispersibility, low viscosity, and high bonding strength. The prepared fiberboard does not release formaldehyde, is safe and environmentally friendly, and has a good flame retardant performance.

Description

technical field [0001] The invention relates to the technical field of resource utilization of starch and fiber waste, in particular to a method for preparing a formaldehyde-free flame-retardant fiberboard. Background technique [0002] At present, the adhesives used in the wood-based panel industry are mainly urea-formaldehyde resin glue (UF), phenolic resin glue (PF), and melamine-formaldehyde resin glue (MF). Poison hazard. The raw materials of the above-mentioned adhesives are basically derived from petroleum products. With the increasing scarcity of petroleum resources, it is the development direction of adhesives to seek environmentally friendly, safe and renewable substitutes. In addition, with the improvement of fire protection requirements in modern buildings, the market demand for flame-retardant wood-based panels is increasing. [0003] Starch-based adhesive is an important development direction of adhesive "green chemistry". As a natural adhesive, starch glue ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L3/10C08K3/30C08K7/08C08K3/16C08K7/04C08K3/28C08K3/26C08K3/32B27N3/00B27N3/12C08B31/18
Inventor 胡华宇陈俊鸿黄爱民黎丽莉龚玲珍李婉赫农雪娇张燕娟沈芳黄祖强覃宇奔
Owner GUANGXI UNIV
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