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Method for preparing polyvinyl alcohol rice straw composite material

A polyvinyl alcohol and composite material technology, which is applied in the field of preparing polyvinyl alcohol rice straw composite materials, can solve the problems of unfavorable rice straw full bonding, difficulty in achieving uniform distribution, and affecting material performance, so as to increase user affinity and uniform performance , good color effect

Inactive Publication Date: 2014-01-01
JIUJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing method of manufacturing polyvinyl alcohol rice straw composite materials, the rice straw is directly mixed with polyvinyl alcohol and then hot-pressed. Although a composite material with better performance is obtained, the polyvinyl alcohol has serious aggregation in the composite material. phenomenon, it is difficult to achieve uniform distribution, which is not conducive to the sufficient bonding between rice straws, and affects the performance of the material

Method used

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  • Method for preparing polyvinyl alcohol rice straw composite material
  • Method for preparing polyvinyl alcohol rice straw composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] After the rice straw is dried in the sun, it is chopped into small sections of 2 cm. Weigh 100 grams of chopped rice straw and place it in a stirring tank. Weigh 40 grams of polyvinyl alcohol, add it to 620 mL of water, and stir to dissolve at 90°C. Pour the polyvinyl alcohol solution into the mixing tank filled with crushed rice straw while it is hot, and stir evenly. Put the wet material in a stainless steel pan, dry it at 65°C until the water content is 20%, stir or tear it intermittently to prevent it from forming into large pieces. The dried material was put into a mold, and then hot-pressed at 150°C and 18MPa for 15min. After cooling to room temperature, unmould and trim. The tensile strength of the composite material reaches 9.62MPa.

Embodiment 2

[0022] After the rice straw is dried in the sun, it is chopped into small sections of 3 cm, and then cut and pulverized by an anchor grinder. Weigh 100 grams of crushed rice straw and place it in a stirring tank. Weigh 40 grams of polyvinyl alcohol, add it to 620 mL of water, and stir to dissolve at 90°C. Pour the polyvinyl alcohol solution into the mixing tank filled with crushed rice straw while it is hot, and stir evenly. Put the wet material in a stainless steel pan, dry it at 65°C until the water content is 20%, stir or tear it intermittently to prevent it from forming into large pieces. The dried material was put into a mold, and then hot-pressed at 150°C and 18MPa for 15min. After cooling to room temperature, unmould and trim. The tensile strength of the composite material reaches 10.35MPa.

Embodiment 3

[0024] The rice straw is dried in the sun and crushed by a straw crusher. Weigh 100 grams of crushed rice straw and place it in a stirring tank. Weigh 30 g of polyvinyl alcohol, add it into 450 mL of water, and stir to dissolve at 90°C. Pour the polyvinyl alcohol solution into the mixing tank filled with crushed rice straw while it is hot, and stir evenly. Put the wet material in a stainless steel pan, dry it at 80°C until the water content is 15%, stir or tear it intermittently to prevent it from forming into large pieces. The dried material was put into a mold, and then hot-pressed at 145°C and 12MPa for 13min. After cooling to room temperature, unmould and trim. The tensile strength of the composite material reaches 8.04MPa.

[0025]

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Abstract

The invention relates to a method for preparing a polyvinyl alcohol rice straw composite material. The method comprises processes of treating rice straw material, preparing coating liquor, preparing polyvinyl alcohol-coated rice straws, carrying out semi-drying and hot pressing and demolding. In the coating process, dosage of a solvent adopts double restraints, so that not only is sufficient coating ensured, but drying time and energy are saved. The semi-drying method is adopted for not only lowering energy consumption, but also promoting adhesion of rice straws in the hot-pressing process. Relative to a direct-mixing hot-pressing process, the method is used for solving an aggregation phenomenon of polyvinyl alcohol in the composite material, so that the prepared composite material is uniform in material composition, structure and performance, good in color and luster, high in strength and environment-friendly in process. The prepared composite material can be used for manufacturing articles of daily use, ornaments as well as agricultural auxiliary products, also can be further compounded with wood or plastics to produce the articles of daily use, ornaments as well as agricultural auxiliary products which are higher in cost performance.

Description

technical field [0001] The invention relates to a method for preparing a polyvinyl alcohol rice stalk composite material, which belongs to the field of deep processing and utilization of crop stalks. Background technique [0002] my country is a big rice planting country. The national rice planting area is 400 million mu, accounting for 22% of the country's cultivated land area. This makes rice straw a huge by-product of my country's agricultural production. In the past, rice straw was used to feed livestock and as fuel. Today, the consumption of rice straw in these two ways is very small, because of the huge changes in agricultural farming methods and rural lifestyles. A lot of rice stalks are burned in the fields, which not only wastes resources, but also pollutes the environment, and also brings serious difficulties to industries such as transportation. [0003] Rice straw is a high-quality natural material. In ancient my country, there was a tradition of using rice stra...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08L29/04B29C43/58
Inventor 吴传保尹健美曾湘晖刘利江
Owner JIUJIANG UNIVERSITY
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