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Gluing-free middle and high-density fiber board preparation method

A technology of high-density fiberboard and glue bonding, which is applied in the fields of pulping with acid/acid anhydride, textile and papermaking, and separation of raw materials. It can solve the problems of unsuccessful industrial application and practicality, and achieve pressure reduction and no discharge of three wastes. problem effect

Inactive Publication Date: 2007-12-12
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research and development of glueless bonding of wood-based panels has received attention again after decades of silence, but so far there has been no successful industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Masson pine glue-free bonded high-density fiberboard

[0015] Raw materials include masson pine board bark, acetic acid, industrial sulfuric acid, and No. 52 paraffin.

[0016] The masson pine slab is sliced ​​by a wood chipper and pulverized to a diameter of about 1-3 millimeters with a hammer mill, and an acetic acid solvent is prepared, which contains 30% acetic acid solution with a mass fraction of 0.01% industrial sulfuric acid;

[0017] Put 1,000 kg of horsetail powder with a diameter of about 1-3 mm and 2,000 kg of acetic acid solvent into the stainless steel pressure steaming ball. After the materials are mixed and steamed at 120 ° C and a pressure of 1.2 MPa for 2 hours, stop heating and use waste heat to recover acetic acid and others. Volatile components such as methanol, formic acid, furfural, etc.; add water equivalent to twice the mass of the reactant, mix well, put the reaction product into a beater for beating, and centrifuge to separate the l...

Embodiment 2

[0018] Embodiment 2: Straw adhesive-free bonding medium density fiberboard

[0019] Raw materials include rice straw, acetic acid, industrial hydrochloric acid, and beeswax.

[0020] The rice straw is crushed into about 1-10 centimeters in length with a hammer mill, and an acetic acid solvent is prepared, which contains 50% acetic acid solution in mass fraction, and 0.05% industrial sulfuric acid in mass fraction;

[0021] Put 1,000 kg of rice straw with a length of about 1-10 cm and 2,000 kg of acetic acid solvent into a stainless steel cooking pot with a stirring device at atmospheric pressure. Active ingredients such as methanol, formic acid, etc.; add water equivalent to twice the mass of the reactant, stir and mix thoroughly, put the reaction product into a beater for beating, and centrifuge to separate the liquid part to provide as xylooligosaccharide and acetic acid production Raw materials, the denatured fiber material obtained by centrifugation is waxed (1.5% W / W, be...

Embodiment 3

[0022] Embodiment 3: Glue-free bonding of wheat straw poplar to medium density fiberboard

[0023] Raw materials include wheat straw, poplar wood scraps, ethanol, formic acid, and No. 52 paraffin.

[0024] Poplar leftovers are sliced ​​with a wood chip machine and then crushed with a hammer mill to a diameter of about 1-3 mm, and wheat straw is crushed with a hammer mill to a length of about 1-10 cm; prepare an ethanol solvent, which contains mass Fraction is 20% ethanol solution, and adding mass fraction is 1% formic acid;

[0025] 400 kilograms of poplar wood powder with a diameter of about 1-3 millimeters, 600 kilograms of wheat straw with a length of about 1-10 centimeters, and 3000 kilograms of 20% ethanol solution (adding mass fraction of 1% formic acid) were successively dropped into the stainless steel pressure steaming ball; After mixing and cooking the materials at 140°C and a pressure of 2.75MPa for 1.5 hours, stop heating, use waste heat to distill to recover acet...

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Abstract

The invention discloses a no glue bonding middle or high-density fiberboard preparation method, its process steps are: (1) preparing dissolvant; (2)collecting and processing plant fiber materials; (3) feeding materials; (4) reaction; (5) solvent recovery; (6) beating and separating hemi-cellulose; (7) activating lignin; (8) render hydrophobic; (9) blank plate pavement; (10) hot (or cold) pressure molding. The advantages are: (1) the problem of free formaldehyde releasing in middle fiber plate is completely resolved; (2) so the herbaceous plant fiber has same economic value with woody plant and is used in the production of middle or high-density fiberboard fully; (3) the plant fiber materials are used fully, it basically has not the waste emissions problems.

Description

technical field [0001] The invention relates to a method for preparing medium and high density fiberboards, in particular to a method for preparing medium and high density fiberboards bonded without glue. Background technique [0002] my country's forest coverage rate is less than 18%, and the contradiction between timber supply and demand is prominent. The main way to solve this contradiction is to vigorously develop various types of wood-based panels in order to make full use of wood and various lignocellulose materials. Further reduce the pressure on my country's forest resources. Traditionally, the production of wood-based panels is inseparable from various synthetic resin-based wood adhesives. And at present more than 90% of wood adhesives belong to trialdehyde glue (urea-formaldehyde; phenolic and melamine formaldehyde resin); wherein the usage amount of urea-formaldehyde glue is the largest again. The production of various wood-based panels with urea-formaldehyde g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21J3/12D21C3/04D21B1/06
Inventor 刘玉环
Owner NANCHANG UNIV
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