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Water-soluble polyalcohol, polyisocyanic acid ester and stalk fibrous composite material and preparation thereof

A polyisocyanate, water-based polymer technology, applied in the pretreatment of molding materials, manufacturing tools, flat products, etc., can solve the problems of low toughness of PMDI straw board, high PMDI price, lack of competitiveness, etc., and achieve good market prospects , Save warm-up time, and enhance the effect of macroscopic mechanical properties

Inactive Publication Date: 2008-08-06
南通双弘制线有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of PMDI has been high, and the straw fiber composite materials prepared by bonding are not competitive in the wood-based panel market.
In addition, PMDI straw boards still have the disadvantages of low toughness and poor processing performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment one: each component used in the present embodiment and mass ratio thereof are as follows:

[0033] Rice Straw Fiber 88.0%

[0034] Vinyl acetate-ethylene copolymer emulsion (20% solid content) 10.0%

[0035] Water-dispersible polymeric polyisocyanate (EMDI) 1.0%

[0036] Talc 1.0%

[0037] A total of 25 kg of the above-mentioned components is formed according to the above-mentioned molding process to obtain the water-based polymer-polyisocyanate-straw fiber composite material sheet of the present invention, wherein the hot-pressing temperature is 150 ° C, the pressure is 3.5 MPa, and the time is 180 s.

Embodiment 2

[0038] Embodiment 2: In this embodiment, the components and proportions of the water-based polymer, polyisocyanate and straw fiber composite material are as follows:

[0039] Wheat Straw Fiber 85.0

[0040] Vinyl acetate-ethylene copolymer emulsion (20% solid content) 4.5

[0041] SBR latex (20% solid content) 9.0

[0042] Blocked polymeric polyisocyanate (B-PMDI) 1.0

[0043] Calcium carbonate 0.5

[0044] A total of 25 kg of the above-mentioned components is formed according to the above molding process to obtain the water-based polymer-polyisocyanate-straw fiber composite material plate of the present invention, wherein the hot-pressing temperature is 155 ° C, the pressure is 4.0 MPa, and the time is 210 s.

Embodiment 3

[0045] Embodiment 3: In this embodiment, the components and proportions of the water-based polymer, polyisocyanate and straw fiber composite material are as follows:

[0046] Wheat Straw Fiber 40.0

[0047] Rice Straw Fiber 44.0

[0048] SBR latex (20% solid content) 12.0

[0049] Blocked polymeric polyisocyanate (B-PMDI) 1.5

[0050]Kaolin 0.5

[0051] A total of 25 kg of the above-mentioned components is formed according to the above molding process to obtain the water-based polymer-polyisocyanate-straw fiber composite material plate of the present invention, wherein the hot-pressing temperature is 160 ° C, the pressure is 3.5 MPa, and the time is 210 s.

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PUM

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Abstract

The invention relates to a composite material of water-based polymer, polyisocyanate and straw fiber and a manufacturing method thereof. The composition and quality percentage of the composite material are as follows: 83.0-90 percent of straw fiber, 9.0-14 percent of water-based polymer, 0.5-2.0 percent of polyisocyanate cross linker, and 0.5-1.0 percent of inorganic filler. The specific preparation method is as follows: processing of straw fiber, formulation of water-based polymer main glue, successively spraying of the main glue and isocyanate cross linker, pavement of gum fiber, precompression under a normal temperature, and hot-pressing solidification and molding, and ultimately the water-based polymer-polyisocyanate-straw fiber composite material is manufactured. The sheet manufactured by the method has the advantages that not only high adhesive strength, fracture toughness, and water-proof property are possessed, but the technique is simple; the production cost of the fiberboard is lower; a good market prospect is acquired.

Description

technical field [0001] The invention relates to a water-based polymer, polyisocyanate and straw fiber composite material and a preparation method thereof. Background technique [0002] The report of WWF (March 9, 2005) shows that China will become the world's largest timber consumer in the next five years. The existing fellable mature forest in the country is only 1.4-1.5 billion m 3 , can only be maintained for 5-6 years according to the current consumption level. On the other hand, our country is still a big agricultural country, with abundant sources of agricultural surplus material, some people call it "the second forest". In 1995 alone, the output of crop straw in my country was 604 million tons, and the available straw amount was 513.4 million tons, except that straw returning directly to the field and collecting losses accounted for about 15.0%. The use of renewable agricultural residue straw as a light solid raw material for new plant fiber reinforced composite ma...

Claims

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Application Information

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IPC IPC(8): B27N3/04B27N1/00B27N1/02B27N3/08B27N3/10C08L1/02C08K3/00C08L31/04C08L7/02C08L9/08
Inventor 胡宏玖汤傲洁陈国华谢苏江徐宏斌周沙溆
Owner 南通双弘制线有限公司
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