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Preparation method of aqueous polyurethane for middle-high-density fiberboard

A technology of high-density fiberboard and water-based polyurethane, applied in the direction of polyurea/polyurethane adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of poor waterproof and moisture-proof effect of products, board functions, etc. Achieve the effects of shortening curing time, increasing stability and improving initial viscosity

Active Publication Date: 2013-09-25
DONGYING ZHENGHE WOOD IND
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for preparing water-based polyurethane for medium and high-density fiberboard, aiming at the environmental problems caused by the release of formaldehyde in the production of fiberboard, and the problem of board function defects caused by poor waterproof and moisture-proof effects of products. In the production of fiberboard, it can produce products that meet the Japanese F**** level, the US CARB certification Ш stage, and the European standard E 0 Grade formaldehyde release requirements, waterproof and moisture-proof panels required for indoor and outdoor

Method used

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  • Preparation method of aqueous polyurethane for middle-high-density fiberboard

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Embodiment 1

[0025] raw material Content (weight percent) Weight (kg) Remark N220 99.5％ 8 N330 99.5％ 5 TDI 99.6％ 30 MDI 99.6％ 20 DEG 99.6％ 2 DMPA 99.5％ 3 Dibutyltin dilaurate 99％ 0.5 Triethylamine 99.5％ 1.5 PAPI 99.9％ 10 BTMSPA 98％ 1.5 KH-558 98％ 0.5 ammonia 18％ 8 MUF 43-47％ 60

[0026] The specific preparation steps of waterborne polyurethane are as follows:

[0027] 1) Synthesis of hydrophilic polyurethane prepolymer:

[0028] a. Add metered N220, N330, TDI, MDI into the reaction kettle equipped with mechanical stirring, nitrogen, temperature controller, constant pressure dropping funnel, and condensation reflux equipment, and control the reaction temperature to 50-60°C;

[0029] b Add DMPA and DEG, keep warm for 1.5-2 hours;

[0030] Raise the temperature to 65-75°C, add triethylamine and dibutyltin dilaurate, stir for 10-20min, and slowly a...

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PUM

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Abstract

The invention relates to a preparation method of aqueous polyurethane for a middle-high-density fiberboard. The preparation method comprises the steps of synthesis of a hydrophilic polyurethane prepolymer and blending and modifying of low-molecular-weight amino resin, wherein the hydrophilic polyurethane prepolymer comprises the following components in percentage by weight: 8-15% of polyester polyol, 40-60% of isocyanate a, 1.5-6% of hydrophilic chain extender, 0.5-3% of catalyst, 10-25% of isocyanate b, 0.5-3% of amino silane coupling agent and 4-10% of neutralizer. According to the aqueous polyurethane prepared by utilizing the preparation method, a -NCO group in the resin is reasonably closed; and due to the introduction of MUF (melamine-modified urea formaldehyde) resin, a microstructure of the resin is improved, the molecular weight of the aqueous polyurethane is reduced and the stability of the resin is improved. The aqueous polyurethane is synthesized by utilizing manners of inner-crosslikining and blending dual-modifying, the cost is much lower than that of the commercially available PMDI (polydiphenylmethane diisocyanate) resin, and the pressed fiberboard can meet emission loads of formaldehyde and VOC (volatile organic compounds) in export requirements of automotive trims.

Description

technical field [0001] The invention relates to a water-based polyurethane and a preparation method thereof, in particular to an environmentally friendly and non-toxic water-based polyurethane for medium and high-density fiberboard production and a preparation method thereof, belonging to the field of wood-based panel adhesives. Background technique [0002] Due to its excellent performance, easy processing and moderate price, medium and high density fiberboard has been favored by people. With the advancement of science and technology, the continuous emergence and improvement of derivative series products and deep-processing varieties of fiberboard, all kinds of fiberboard will be more and more widely used in various fields of the national economy. [0003] Fibreboard production is inseparable from adhesives. At present, urea-formaldehyde resin glue accounts for more than 90% of the total amount of adhesives used in fiberboard production, but the fatal defect of urea-formal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J161/30C08G18/76C08G18/75C08G18/66C08G18/42C08G18/38C08G12/38
Inventor 纪良樊茂祥李英俊
Owner DONGYING ZHENGHE WOOD IND
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