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Alkaline thiourea disentangled straw/resin composite board making method

A technology of resin compounding and disentanglement, which is applied in the field of material compounding, can solve the problems of high energy consumption, pollution, and a large amount of waste liquid, and achieve the effects of reducing pollution, simple and convenient operation, and saving costs

Inactive Publication Date: 2014-04-09
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN102704296A discloses a method for treating straw raw materials with lye. The straw raw materials are soaked in lye for 1-3 hours, and then steamed at 130°C-200°C for 1-2 hours, so as to remove lignin and separate cellulose and hemicellulose, this treatment method needs to use a large amount of lye to completely soak the straw, and this high-temperature steam treatment consumes too much energy
CN101074285A discloses a method for dissolving cellulose, dispersing cellulose in 6wt%-14wt% LiOH aqueous solution, then pre-cooling to 0-8°C, stirring to form an alkali cellulose solution, and then adding 2wt% of 0-15°C %-40wt% urea aqueous solution, stir evenly at room temperature to obtain a transparent cellulose solution. This treatment method requires a large amount of lye and urea to soak the cellulose. If it is used to prepare composite boards, a large amount of waste liquid needs to be processed and it is easy to cause pollution.

Method used

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  • Alkaline thiourea disentangled straw/resin composite board making method

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preparation example Construction

[0028] The preparation method of the alkali urea disentangling straw / resin composite board involved in the present invention mainly includes the following two steps:

[0029] a) Preparation of straw fibers by alkaline urea disentanglement

[0030] Straw fibers are broken into short fibers of 40-50mm; the pre-cooled 7wt%-28wt% NaOH aqueous solution that is 1-2 times the mass of straw is sprayed on the short fibers, stirred and kneaded for 30 minutes to 2 hours; then the mass of straw is 1-2 times the pre-cooled 14wt%-42wt% urea aqueous solution is sprayed on the short fiber, and the stirring and kneading is continued for 30 minutes to 2 hours; finally, it is dried and crushed to 60 mesh powder to obtain the alkali urea deentangled straw fiber.

[0031] b) Alkaline urea disentanglement of straw fiber and resin composite

[0032] The alkali urea deentanglement straw fibers are mixed with plastic on double rollers, compatibilizers, lubricants, fillers, etc. are added, mixed evenl...

Embodiment 1

[0036] Example 1 Preparation of Alkaline Urea Disentanglement Straw / Resin Composite Board

[0037] Get 50 parts of straw fibers and break into 50mm short fibers. Spray 80 parts of precooled 14wt% NaOH aqueous solution onto 50 parts of short straw fibers, stir and knead for 30 minutes; then spray 80 parts of precooled 28wt% urea aqueous solution on the short fibers, and continue stirring and kneading for 30 minutes ; Finally drying and crushing to 60-mesh powder to obtain alkali urea disentangling straw fibers. Add 50 parts of alkali urea disentangling straw fibers to 50 parts of HDPE, add 1 part of maleic anhydride grafted polyethylene, 2 parts of zinc stearate, and 1.3 parts of titanium dioxide, and press them into shape after kneading with double sticks to obtain alkali urea Disentangling straw / resin composite panels. The mechanical properties of the obtained composite materials are listed in Table 1.

Embodiment 2

[0038] Example 2 Preparation of Alkaline Urea Disentanglement Straw / Resin Composite Board

[0039]Get 30 parts of straw fibers and break into 50mm short fibers. Spray 50 parts of precooled 14wt% NaOH aqueous solution onto 30 parts of straw short fibers, stir and knead for 30 minutes; then spray 50 parts of precooled 28wt% urea aqueous solution onto short fibers, and continue stirring and kneading for 30 minutes Minutes; finally dried and crushed to 60 mesh powder to obtain alkali urea detangled straw fibers. Add 30 parts of alkali urea disentangling straw fibers to 70 parts of HDPE, add 1 part of maleic anhydride grafted polyethylene, 2 parts of zinc stearate, and 1.3 parts of titanium dioxide, and press them into shape after kneading with double sticks to obtain alkali urea Disentangling straw / resin composite panels. The mechanical properties of the obtained composite materials are listed in Table 1.

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Abstract

The invention discloses an alkaline thiourea disentangled straw / resin composite board making method. The method comprises the following steps: sprinkling short fibers of straws with a pre-cooled aqueous NaOH solution, and stirring and kneading for 30min-2h; sprinkling the short fibers with a pre-cooled aqueous urea solution, and continuously stirring and kneading for 30min-2h; drying, and crushing to 60 mesh powder to obtain alkaline thiourea disentangled straw fibers; and blending the obtained alkaline thiourea disentangled straw with resin, a compatilizer, a lubricant and a filler, compacting or extruding, and carrying out continuous production to obtain alkaline thiourea disentangled straw / resin composite boards. The alkaline thiourea disentangled straw / resin composite boards made by utilizing the method can be widely applied to the fields of building materials, decoration materials, packaging materials and the like because of the advantages of light weight, low price, good strength and the like.

Description

technical field [0001] The invention relates to a straw fiber composite material, in particular to a method for preparing a composite plate of alkali urea disentangling straw fiber and resin, and belongs to the technical field of material compounding. Background technique [0002] Alkaline urea disentangling straw / resin composite board is a composite board made of straw fibers and thermoplastics. It is a new material for recycling agricultural waste and improving product quality. As a large agricultural country, my country has abundant crop fiber resources, among which the average annual output of wheat straw and rice straw reaches 240 million tons. The traditional disposal methods of these agricultural residues are discarding and burning, which wastes resources and pollutes the environment. In recent years, more and more scholars have devoted themselves to the study of compounding crop plant fibers with thermoplastic polymers as fillers or reinforcing materials. Compared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L23/06C08L23/12C08L27/06
Inventor 李学锋邹丹闫晗李坚舒鹏
Owner HUBEI UNIV OF TECH
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