Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method for fiberboards

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

Inactive Publication Date: 2015-11-04
金爱莲
View PDF0 Cites 1 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for fiberboards
  • Preparation method for fiberboards
  • Preparation method for fiberboards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 125 parts by weight of fiber slurry, 10 parts by weight of urea-formaldehyde resin, and 6.5 parts by weight of propyl p-hydroxybenzoate 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

[0050] 167 parts by weight of fiber slurry, 20 parts by weight of urea-formaldehyde resin, and 11 parts by weight of propyl p-hydroxybenzoate 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

[0052] 140 parts by weight of fiber slurry, 15 parts by weight of modified urea-formaldehyde resin, and 4.5 parts by weight of propyl p-hydroxybenzoate were uniformly mixed in a stirring tank, and the mixture was dried at 80°C until the water 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
strengthaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of fiberboards, and relates to a preparation method for the fiberboards low in formaldehyde content. The preparation method includes the steps that adhesives and propyl p-hydroxybenzoate are added to fiber sizing agents with the moisture content of 20-40 wt%, even mixing is conducted, and a mixture is obtained till the moisture content is lowered to 8-15 wt% in a dried manner; the obtained mixture is pre-pressed into blanks, and isostatic pressing is conducted on the blanks to obtain board blanks; and hot pressing is conducted on the board blanks, and cooling, hardening and tempering and sanding are conducted to obtain the fiberboards. The fiberboards are suitable for buildings, decoration, industrial manufacturing and the like.

Description

technical field [0001] The invention belongs to the technical field of fiberboards, and in particular relates to a preparation method of low-formaldehyde fiberboards. 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/04B27N3/08B27N1/00C09J161/24C09J11/04C08G12/12C08K3/34
Inventor 金爱莲
Owner 金爱莲
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com