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Production method of environmental-friendly type low-cost middle and high density fiber board

A high-density fiberboard, production method technology, applied in the direction of adhesive types, non-polymer adhesive additives, household components, etc. The effect of working hours

Active Publication Date: 2010-08-04
ZHEJIANG FORESTRY ACAD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also many other patent application materials, which also address the technical problem of low formaldehyde release from single or multiple angles. Due to the differences in raw materials, proportions, and addition processes, they have made their own technical contributions. Different from the additive process, each technical solution must be different in terms of reducing the amount of formaldehyde released, the cost, the simplicity of the process, and the strength of compatibility. , it is difficult to compare

Method used

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  • Production method of environmental-friendly type low-cost middle and high density fiber board
  • Production method of environmental-friendly type low-cost middle and high density fiber board
  • Production method of environmental-friendly type low-cost middle and high density fiber board

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Embodiment 1

[0054] Embodiment 1 (the raw material of corresponding embodiment 1 and the proportioning value by weight in the comparison table):

[0055] Add 100 parts by weight of formaldehyde solution with a concentration of 37.2% (hereinafter referred to as parts) into the reaction kettle, adjust the pH to ≥ 8 with 30% NaOH, heat, add 40 parts of formaldehyde for the first time, raise the temperature to 60°C, stop heating, and add formaldehyde Solution (i.e. formaldehyde melamine solution) 18 parts, heat up to 80-85°C, heat preservation reaction for 0.5h, cool to 80-75°C, adjust pH=4.5 with 25% formic acid in 2-3 times, measured 20 When the viscosity is 15S in 4 cups at ℃, add NaOH to adjust the pH=5.2, add 6 parts of urea for the second time, and raise the temperature to 80-85 °C for reaction. When the viscosity is 16S, add 9 parts of urea for the third time, and then raise the temperature to 80 React at -85°C, when the viscosity is measured at 19S, add NaOH to adjust the pH ≥ 7.5, coo...

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Abstract

The invention relates to a production method of an environmental-friendly type low-cost middle and high density fiber board. Self-made modified urea-formaldehyde glue, a composite curing agent and a formaldehyde trapping agent are used in a glue blending procedure, wherein the modified urea-formaldehyde glue is prepared by heating formaldehyde, melamine and urea in a reaction kettle through a chemical reaction; the composite curing agent is prepared by mixing ammonium chloride, boric acid, oxalic acid and water; and the formaldehyde trapping agent is prepared from phosphoric acid, urea, a catalyst and water under a certain temperature condition. When the middle and high density fiber is produced, the application amount of the formaldehyde trapping agent is 3 percent or 4 percent of the weight of modified urea-formaldehyde glue solid, the application amount of the modified urea-formaldehyde glue solution is 12.5 percent of the weight of absolute dried fiber, and the application amount of the composite curing agent is 3 percent or 2 percent of the weight of the modified urea-formaldehyde glue solution. The middle and high density fiber board produced using the three ingredients can completely meet Eo level environmental-friendly requirements, has good compatibility and high bonding strength and greatly reduces production cost of the fiber board.

Description

technical field [0001] The invention relates to a production method of a fiberboard added with preparations such as a formaldehyde trapping agent. Background technique [0002] At present, in the production of fiberboard, urea-formaldehyde glue is generally used as adhesive in consideration of cost and gluing performance. However, this glue is easy to release free formaldehyde, a carcinogenic and teratogenic substance, which affects human health. Deal with, or add the new method that reduces free formaldehyde emission such as formaldehyde trapping agent to constantly appear, disclose " a kind of manufacturing method of low formaldehyde emission high-density fiberboard " as CN101306553, be 1.05-0.93 urea-formaldehyde glue with total molar ratio as Adhesive, with or without adding sodium chloride, ammonia water, hexamethylenetetramine, borax, triethanolamine, urea and water as formaldehyde scavenger, and adding a composite curing agent similar to the above-mentioned formaldehy...

Claims

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Application Information

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IPC IPC(8): B27N3/04C09J161/30C09J11/06
Inventor 李琴杨小军汪奎宏张建李翠翠曾昭阳谈阳袁少飞
Owner ZHEJIANG FORESTRY ACAD
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