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Natural fiber composite material and preparation method thereof

A natural fiber and composite material technology, applied in the field of natural fiber composite materials and its preparation, can solve the problems of high water absorption, cost increase, and perishability of natural fibers, and achieve the effect of simple operation steps

Inactive Publication Date: 2010-08-11
漳州市奈特新型建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of natural fibers is limited due to their high water absorption and perishability
Composite materials made of natural fibers are usually not waterproof and cannot be used outdoors for a long time. In order to improve the waterproof effect of the above composite materials, an existing method is to use a large amount of polymer materials to cover all natural fibers. But in this way, the cost will inevitably increase significantly; another way is to modify natural fibers. The existing natural fiber modification methods include the use of chemical methods, such as soaking lye, modifying with highly active chemical raw materials, etc. , usually produce a large amount of waste water; or use a small amount of lipophilic polymer monomer to chemically graft it on the surface of natural fibers to achieve waterproof effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 30g of water-based epoxy resin, 100g of wood flour (natural fiber), 50g of silicone oil (filler), 3g of ethylenediamine (water-soluble hardener), 1g of tetrabutylammonium bromide (phase transfer catalyst) and water by weight ratio 200g.

[0026] 30g water-based epoxy resin is obtained by the following manner: take epoxy resin 15g, 4,4-azobis (4-cyanovaleric acid) (starter) 5g and styrene (monomer) 10g, epoxy resin The resin, 4,4-azobis(4-cyanovaleric acid) and styrene were put into a reaction kettle and mixed, and the mixture was obtained by reacting under pressure at 150° C. for 1 hour.

[0027] Add the above-mentioned water, water-based epoxy resin and ethylenediamine into the stirring tank, disperse the water-based epoxy resin and ethylenediamine in water to form an emulsion, then add tetrabutylammonium bromide, wood powder and silicone oil to mix evenly, at 80 The reaction was carried out at °C for 60 hours; after the reaction was completed, the reactant was t...

Embodiment 2

[0032] 70g of water-based epoxy resin, 500g of wood flour (natural fiber), 200g of lard (filler), 0.3g of ethylenediamine (water-soluble hardener), 0.01g of tetrabutylammonium bromide (phase transfer catalyst) by weight ratio g and water 100g.

[0033] 70g water-based epoxy resin is obtained by the following manner: take epoxy resin 49g, 4,4-azobis(4-cyanovaleric acid) (starter) 20g and styrene (monomer) 1g, epoxy resin The resin, 4,4-azobis(4-cyanovaleric acid) and styrene were put into a reaction kettle and mixed, and the mixture was obtained by reacting under pressure at 150° C. for 1 hour.

[0034] Add the above-mentioned water, water-based epoxy resin and ethylenediamine into the stirring tank, disperse the water-based epoxy resin and ethylenediamine in water to form an emulsion, then add tetrabutylammonium bromide, wood flour and lard to mix evenly, The reaction was carried out at 100° C. for 48 hours; after the reaction was completed, the reactant was transferred to an o...

Embodiment 3

[0039] Take 130g of water-based epoxy resin, 250g of wood powder (natural fiber), 500g of soil powder (filler), 5g of ethylenediamine (water-soluble hardener), 5g of tetrabutylammonium bromide (phase transfer catalyst) and Water 150g.

[0040] 130g water-based epoxy resin is obtained by the following manner: take 100g of epoxy resin, 20g of 4,4-azobis(4-cyanovaleric acid) (starting agent) and 10g of styrene (monomer), and epoxy The resin, 4,4-azobis(4-cyanovaleric acid) and styrene were put into a reaction kettle and mixed, and the mixture was obtained by reacting under pressure at 150° C. for 1 hour.

[0041] Add the above-mentioned water, water-based epoxy resin and ethylenediamine into the stirring tank, disperse the water-based epoxy resin and ethylenediamine in water to form an emulsion, then add tetrabutylammonium bromide, wood powder and soil powder to mix evenly, The reaction was carried out at 100° C. for 36 hours; after the reaction was completed, the reactant was t...

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PUM

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Abstract

The invention discloses a natural fiber composite material and a preparation method thereof. The natural fiber composite material is mainly prepared from the following components in parts by weight: 14-135 parts of water-based resin, 100-500 parts of natural fiber, 0.3-5 parts of hardener, 0.01-5 parts of phase transfer catalyst, 50-500 parts of filler and 100-200 parts of water. In the invention, the natural fiber can be fully coated only by a small amount of polymer resin to obtain the natural fiber composite material with excellent waterproof performance; and the modified natural fiber can be used as a raw material of waterproof fiber boards, bakelite powder padding and plastic-wood composites (WPC).

Description

technical field [0001] The invention relates to a natural fiber composite material and a preparation method thereof. Background technique [0002] Natural fiber is rich in resources and low in price. It is a polysaccharide composed of many D-glucopyranose connected to each other by 1,4-β glycoside bonds. Each repeating unit of the cellulose molecule contains 3 hydroxyl groups (- OH), these hydroxyl groups form intramolecular hydrogen bonds or intermolecular hydrogen bonds, so that the fiber has water absorption, and the moisture absorption rate reaches 8-12%. Because natural fibers are highly absorbent and perishable, their use is limited. Composite materials made of natural fibers are usually not waterproof and cannot be used outdoors for a long time. In order to improve the waterproof effect of the above composite materials, one of the existing methods is to use a large number of polymer materials to coat all natural fibers. However, this will inevitably lead to a substa...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08L1/02C08L51/08C08K5/17
Inventor 阮韶铭林镇辉阮榆
Owner 漳州市奈特新型建材有限责任公司
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