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Manufacturing method of high-moisture-proof and high-density fiber board

A technology of high-density fiberboard and manufacturing method, which is applied in the direction of manufacturing tools, flat products, and pretreatment of molding materials, etc., can solve the problems of intense polycondensation reaction, difficult to control the reaction, and reduced bonding strength, so as to achieve a reasonable degree of polymerization. Ease of operation and improved waterproof performance

Active Publication Date: 2009-10-07
DONGYING ARTIFICIAL BOARD FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage of this method is that when melamine is added to a certain amount, the polycondensation reaction is very intense under weak acidic conditions, the reaction is difficult to control, the resin is easy to age, the storage time is short, and the bonding strength is reduced. Volume is limited
When the addition of melamine is insufficient, it will have an adverse effect on the moisture-proof performance of the board

Method used

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  • Manufacturing method of high-moisture-proof and high-density fiber board
  • Manufacturing method of high-moisture-proof and high-density fiber board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The production method of the high moisture-proof high-density fiberboard firstly produces melamine-formaldehyde resin and urea-formaldehyde resin respectively:

[0018] (1) Manufacturing method of moisture-proof melamine formaldehyde resin

[0019] Use 30% sodium hydroxide in the reaction kettle to adjust the formaldehyde solution to PH = 8.5, add melamine to the formaldehyde solution according to the molar ratio of formaldehyde and melamine as 2:1, and carry out polycondensation reaction at 80-90°C, polymerization reaction The time is about 1.5 hours, until the reaction viscosity is 40-55 centipoise (25°C), the temperature is lowered to 35°C, and stored under the condition of PH=8.5.

[0020] (2) Urea-formaldehyde resin production method:

[0021] Use 30% sodium hydroxide in the reaction kettle to adjust the formaldehyde solution to PH = 7.5, according to the above-mentioned total molar ratio of formaldehyde / urea = 1:1, add urea in stages, first carry out the addition...

Embodiment 2

[0030] The production method of the high moisture-proof high-density fiberboard firstly produces melamine-formaldehyde resin and urea-formaldehyde resin respectively:

[0031] (1) Manufacturing method of moisture-proof melamine formaldehyde resin

[0032] Use 30% sodium hydroxide in the reaction kettle to adjust the formaldehyde solution to PH=9.0, add melamine to the formaldehyde solution according to the molar ratio of formaldehyde and melamine as 1.8:1, and carry out polycondensation reaction at 80-90°C, polymerization reaction The time is about 2.0 hours, until the reaction viscosity is 40-55 centipoise (25°C), the temperature is lowered to 35°C, and stored under the condition of PH=9.0.

[0033] (2) Urea-formaldehyde resin production method:

[0034] Use 30% sodium hydroxide in the reaction kettle to adjust the formaldehyde solution to PH = 7.5, according to the above-mentioned total molar ratio of formaldehyde / urea = 1:1, add urea in stages, first carry out the addition...

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Abstract

The invention provides a manufacturing method of high-moisture-proof and high-density fiber board, pertaining to the technical field of board manufacture. The method comprises the following steps: melamine-formaldehyde resin and urea resin are respectively prepared, and then the melamine-formaldehyde resin and the urea resin are mixed into a mixed glue before use; after lumber is chipped into wood chips, the wood chips are cooked and then prepared into wood fiber by defibrating of a defibrator, the mixed glue of the melamine-formaldehyde resin and the urea resin prepared before use, a solidified agent and wax waterproof agent are added to the wood fiber in the fiber ejecting pipe of the defibrator, the wood fiber is dried, paved and shaped, the pavement density is adjusted, and the wood fiber is pressed into board by a thermocompressor. The method is convenient and safe in operation and can respectively enhance the rational polymerization degree of the mixed glue and improve the waterproof property and glue-joint strength of the mixed glue and the stability during the use and storage period. The high-density fiber board prepared by the method is more applicable to a moist condition.

Description

technical field [0001] The invention relates to the technical field of plate production, in particular to a production method of a high moisture-proof high-density fiberboard. Background technique [0002] The purpose of making high moisture-proof high-density fiberboard is to make the board and its products suitable for use in humid climates or environments. The physical and mechanical properties of the board, such as water absorption thickness expansion rate and internal bonding strength, still maintain good indicators in humid climates or environments. The moisture resistance of the board depends mainly on the type of adhesive used and how the adhesive is made. At present, the high-density fiberboard with high moisture resistance basically uses melamine modified urea-formaldehyde resin adhesive with low cost and good moisture resistance, and also uses phenolic resin and diphenylmethane diisocyanate (MDI) with better waterproof performance to make high-density fiberboard....

Claims

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Application Information

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IPC IPC(8): B27N3/08B27N1/00B27N1/02C09J161/28C09J161/24
Inventor 王云林李兆滨盖秀芹缪金彩
Owner DONGYING ARTIFICIAL BOARD FACTORY
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