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Preparation method for fiberboard with low formaldehyde content

A fiberboard and low-formaldehyde technology, applied in the field of fiberboard, can solve the problems of secondary pollution, high cost, low bonding strength, etc.

Inactive Publication Date: 2015-08-19
王良源
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the current low-formaldehyde fiberboard either has low bonding strength, or is costly and prone to secondary pollution

Method used

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  • Preparation method for fiberboard with low formaldehyde content
  • Preparation method for fiberboard with low formaldehyde content
  • Preparation method for fiberboard with low formaldehyde content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 125 parts by weight of fiber slurry, 10 parts by weight of urea-formaldehyde resin, and 6.5 parts by weight of propyl benzoate are uniformly mixed in a stirring tank, and the mixture is dried at 50-70°C until the water content is 15 wt%, to obtain a mixture. The mixture was pre-pressed at 4-5MPa for 30s to form a blank, and the blank was isostatically pressed at 8MPa and 70°C for 1min to form a slab. The slab is hot-pressed, and the hot-pressing conditions are as follows: the temperature is 150-160°C; the temperature is raised to 13.5-19MPa within 20-30s, and the pressure is maintained for 60-120s; and then the pressure is reduced to 3.5-5.5MPa within 10-15s. Hold the pressure for 65-135s; then rise to 6-8.5MPa within 10-15s, hold the pressure for 50-75s; finally depressurize evenly to 0MPa within 30-45s. The hot-pressed sheet was cooled to room temperature, tempered and sanded to obtain a fiberboard A with a thickness of 25 mm.

Embodiment 2

[0048] 167 parts by weight of fiber slurry, 20 parts by weight of urea-formaldehyde resin, and 11 parts by weight of propyl benzoate are uniformly mixed in a stirring tank, and the mixture is dried at 60-70°C until the water content is 10 wt%, to obtain a mixture. The mixture was pre-pressed at 4-5MPa for 40s to form a blank, and the blank was isostatically pressed at 7MPa and 70°C for 50s to form a slab. The slab is hot-pressed, and the hot-pressing conditions are as follows: the temperature is 150-160°C; the temperature is raised to 13.5-19MPa within 20-30s, and the pressure is maintained for 60-120s; and then the pressure is reduced to 3.5-5.5MPa within 10-15s. Hold the pressure for 65-135s; then rise to 6-8.5MPa within 10-15s, hold the pressure for 50-75s; finally depressurize evenly to 0MPa within 30-45s. The hot-pressed sheet was cooled to room temperature, tempered and sanded to obtain a fiberboard B with a thickness of 25 mm.

Embodiment 3

[0050] 140 parts by weight of fiber slurry, 15 parts by weight of modified urea-formaldehyde resin, and 4.5 parts by weight of propyl benzoate were uniformly mixed in a stirring tank, and the mixture was dried at 80° C. until the moisture content was 10 wt % to obtain a mixture. The mixture is pre-pressed at 4-5MPa for 1min to form a blank, and the blank is isostatically pressed at 7-8MPa and 60-70°C for 50s to form a slab. The slab is hot-pressed, and the hot-pressing conditions are as follows: the temperature is 150-160°C; the temperature is raised to 13.5-19MPa within 20-30s, and the pressure is maintained for 60-120s; and then the pressure is reduced to 3.5-5.5MPa within 10-15s. Hold the pressure for 65-135s; then rise to 6-8.5MPa within 10-15s, hold the pressure for 50-75s; finally depressurize evenly to 0MPa within 30-45s. The hot-pressed sheet was cooled to normal temperature, tempered and sanded to obtain a fiberboard C with a thickness of 25 mm.

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Abstract

The invention belongs to the technical field of fiberboards, and relates to a preparation method for a fiberboard with low formaldehyde content. The method comprises the steps that an adhesion agent and propyl benzoate are added into fiber slurry with moisture content ranging from 20 wt% to 40 wt% and mixed evenly, and the processed fiber slurry is dried to obtain a mixture with moisture content ranging from 8 wt% to 15 wt%; prepressing is conducted on the mixture to obtain a blank, and then isostatic pressing processing is conducted on the blank to obtain a board blank; hot pressing, cooling, hardening and tempering and sanding are sequentially conducted on the board blank to obtain a fiberboard. The fiberboard is suitable for the fields of buildings, decoration, industrial manufacturing and the like.

Description

technical field [0001] The invention belongs to the technical field of fiberboards, in particular to a method for preparing fiberboards with low formaldehyde content. Background technique [0002] Formaldehyde is a recognized carcinogen. Scientific research at home and abroad has confirmed that formaldehyde can cause cell apoptosis by regulating DNA expression, cause oxidative damage to biological macromolecules (protein, DNA), and cause cell canceration. [0003] At present, most of the domestically produced fiberboards have residual free formaldehyde. The main sources of free formaldehyde are: i. The urea-formaldehyde resin commonly used in the manufacture of fiberboard uses formaldehyde as the main raw material, and there will still be unreacted free formaldehyde in the urea-formaldehyde resin; ii. Formaldehyde is released; iii. Hemicellulose in wood gradually decomposes to formaldehyde. Free formaldehyde remaining in fiberboard will endanger human health, so it is nece...

Claims

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Application Information

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IPC IPC(8): B27N3/04B27N3/08C08G12/36C08K3/34C09J161/24C09J11/04
CPCB27N3/04B27N3/002B27N3/08C08G12/36C08K3/34C09J11/04C09J161/24
Inventor 王良源
Owner 王良源
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