Medium density fiberboard with low burst size of methanal and producing method thereof

A technology with low formaldehyde release and production method, applied in other household appliances, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problem of yellowish and unsightly boards, decreased bonding performance, and molecular structure changes. and other problems, to achieve the effects of improved physical and mechanical properties, low production costs, and stable product quality

Inactive Publication Date: 2008-07-09
GUANGXI FENGLIN WOOD IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although reducing the molar ratio of formaldehyde / urea (F / U) in the production of urea-formaldehyde glue is the most effective method, it will cause the molecular structure of the glue to change; the bonding performance will decrease accordingly.
And by reducing the molar ratio of urea-formaldehyde resin, adding melamine to improve the physical properties of the board to produce E 1 board, produced in this manner by E 1 plate with E 2 Compared with the board, the production cost will increase by about 50-65 yuan / m 3 ; E produced by ammonia fumigation 1 board, with E 2 Compared with the production cost of the board, it will increase by about 30-50 yuan / m 3 , but E 1 The appearance of the board is poor, the board is yellowish and unsightly, and the ammonia smoked 1 Residual free ammonia on the board causes secondary pollution to the environment

Method used

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  • Medium density fiberboard with low burst size of methanal and producing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] ① Raw materials are classified and stored, and the moisture content is controlled at 45% to 55%.

[0035] ② Cut various wood raw materials (such as small-diameter wood, wood processing residues, etc.), tree raw materials, etc., into wood chips of certain specifications by mechanical external force. The size and size are: length 16-30mm, width 15-25mm, thickness 3-5mm , the incision is smooth and uniform in size. For the purchased wood chips, the quality inspection shall be carried out according to the above wood chip quality and raw material moisture content requirements.

[0036] ③ Screening of flake raw materials. Remove oversized chips and undersized debris. An oil-immersed iron remover is installed on the belt conveyor to detect and absorb iron and other metals that may exist in the raw materials.

[0037] ④The screened wood chips enter the steam buffer silo with a pressure of 0.7-1.0 MPa and a temperature of 172-178°C for cooking and softening, and the cooking t...

Embodiment 2

[0047] ① Raw materials are classified and stored, and the moisture content is controlled at 45% to 55%.

[0048] ② Cut various wood raw materials (such as small-diameter wood, wood processing residues, etc.), tree raw materials, etc., into wood chips of certain specifications by mechanical external force. The size and size are: length 16-30mm, width 15-25mm, thickness 3-5mm , the incision is smooth and uniform in size. For the purchased wood chips, the quality inspection shall be carried out according to the above wood chip quality and raw material moisture content requirements.

[0049] ③ Screening of flake raw materials. Remove oversized chips and undersized debris. An oil-immersed iron remover is installed on the belt conveyor to detect and absorb iron and other metals that may exist in the raw materials.

[0050] ④The screened wood chips enter the steam buffer silo with a pressure of 0.8-1.0 MPa and a temperature of 174-178°C for cooking and softening, and the cooking t...

Embodiment 3

[0060] ① Raw materials are classified and stored, and the moisture content is controlled at 45% to 55%.

[0061] ② Cut various wood raw materials (such as small-diameter wood, wood processing residues, etc.), tree raw materials, etc., into wood chips of certain specifications by mechanical external force. The size and size are: length 16-30mm, width 15-25mm, thickness 3-5mm , the incision is smooth and uniform in size. For the purchased wood chips, the quality inspection shall be carried out according to the above wood chip quality and raw material moisture content requirements.

[0062] ③ Screening of flake raw materials. Remove oversized chips and undersized debris. An oil-immersed iron remover is installed on the belt conveyor to detect and absorb iron and other metals that may exist in the raw materials.

[0063] ④The screened wood chips enter the steam buffer silo with a pressure of 0.8-1.0 MPa and a temperature of 174-178°C for cooking and softening, and the cooking t...

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Abstract

The present invention discloses a medium-density fibreboard with low formaldehyde-discharging quantity and a production method thereof. The dosage of E2 grade urea-formaldehyde resin is 165 kg/m<3> to 175 kg/m<3>, and the dosage of high-efficiency formaldehyde trapping glue is 5 percent to 20 percent of the dosage of the E2 grade urea-formaldehyde resin and is mixed with the E2 grade urea-formaldehyde resin with a molar ratio of 1.05 to 1.15 in order to form adhesive, which is then applied into wood fibres. Without changing the hot-pressing and hot-grinding techniques in the production of E2 grade medium-density fibreboards, the applied adhesive dosage of the urea-formaldehyde resin of the E2 grade medium-density fibreboards and the dosage of waterproof agent, the discharging quantity of medium-density fibre formaldehyde can be reduced by 50 percent to 80 percent, thus realizing the standard requirement of environment-friendly E1 grade and E0 grade artificial boards. Compared with the E2 grade medium-density fibreboards produced with the same equipment and production technique, the physical mechanical property of the E1 grade and E0 grade medium-density fibreboards is notably improved, the production cost is low, the product quality is stable, the antiaging property is excellent, and the product quality measures up to and is better than standard high-class products and E1 grade requirements.

Description

technical field [0001] The invention relates to a fiberboard and its production method, especially an environmentally friendly E 1 / E 0 A medium density fiberboard with low formaldehyde emission and a production method thereof. Background technique [0002] In the past, formaldehyde was recognized as a possible cause of cancer, but at present, scientists at home and abroad have confirmed that formaldehyde can regulate the expression of DNA, affect cell apoptosis, and cause oxidative damage to biological macromolecules (proteins, DNA) and other mechanisms. cause tissue cell cancer. At present, most of the wood-based panels produced in my country use urea-formaldehyde resin, and the main raw material of urea-formaldehyde resin is formaldehyde. After the wood-based panels are hot-pressed, there is still free formaldehyde in the board, which is harmful to people's health. In order to protect people's health, according to the mandatory requirements of relevant national standar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/04B27N3/08C09J161/24C09J11/00
Inventor 曾灵张运明
Owner GUANGXI FENGLIN WOOD IND GRP CO LTD
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