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Straw base composite material and preparation method thereof

A composite material and rice stalk technology, which is applied to flat products, other household utensils, wood processing appliances, etc., can solve the problems of poor shape selectivity of rice stalks, low proportion of rice stalks, cumbersome preparation process, etc., and achieve improved Environmental compatibility, easy mold assembly, and strong plasticity

Inactive Publication Date: 2012-11-21
JIUJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a considerable part of rice straw is burned in the field, which not only pollutes the environment, but also wastes resources. If the rice straw is used as a resource, it will alleviate the shortage of energy and resources, reduce pollution, and reduce greenhouse gas emissions. There have been some reports on the preparation of composite materials from rice stalks, but the preparation process is cumbersome, the shape selectivity of rice stalks is not strong, the proportion of rice stalks in composite materials is low, the environmental protection is not enough, and the bonding material is basically resin , there are problems such as formaldehyde release; the present invention uses rice stalks processed by flakes as the main material, thermoplastic polyvinyl alcohol or polyvinyl alcohol compound as the bonding material, and water or water emulsion as the composite medium. The rice straw-based composite material was prepared by the method, and the rice straw composite material and its preparation method were innovated

Method used

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  • Straw base composite material and preparation method thereof
  • Straw base composite material and preparation method thereof
  • Straw base composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Cut dry rice stalks with a water content below 1% into small sections of 1.5 cm, cut them in a four-bladed turbo mechanical mixer for 20 seconds, and pass through a 20-mesh sieve to remove dust and powder generated during the crushing process. The product is a mixture of filamentous and flaky rice stalks. Weigh 18 grams of silky and flaky rice stalks, place them in a mixing tank, add 10ml of tap water, and stir for 1 minute to make the rice stalks evenly wetted by water, and then weigh 12 grams. Add the polyvinyl alcohol powder with a degree of polymerization of 1700 and an alcoholysis degree of 88% to the raw material tank, stir for 1 minute to mix the rice straw and the adhesive evenly, and put the mixed material into an iron mold coated with rapeseed oil In the process, place the mold with the material between the pressing plates at a temperature of 140°C, pressurize to 10MPa, heat press for 10min, remove the mold, cool to 30°C and open the mold to obtain the straw-ba...

Embodiment 2

[0037] Cut the dry rice stalks with a water content of 3% into 2.0cm segments, cut them in a four-blade turbine mechanical mixer for 3 minutes, and pass through a 20-mesh sieve to remove dust and powder generated during the crushing process. It is a mixture of filamentous and flake rice stalks. Weigh 15 grams of flaked rice stalks, place them in a stirring tank, add 7ml polyvinyl acetate emulsion, stir for 1 min, so that the rice stalks are evenly wetted by the emulsion, then weigh 15 grams of stalks with a degree of polymerization of 1000 and a degree of alcoholysis of 99% polyvinyl alcohol short filaments are added to the raw material tank, and stirred for 1 minute to evenly mix the rice straw and the adhesive. Put the mixed material into an iron mold coated with simethicone oil, place the mold with the material between platens at a temperature of 150°C, pressurize to 7MPa, heat press for 12min, remove the mold, and cool to After 30°C, the mold was opened to obtain the stra...

Embodiment 3

[0039] Dry the rice stalks until the water content is 5%, then cut them into 4cm lengths of rice stalks, then mechanically shear the rice stalks for 3 minutes, and then pass through a 40-mesh sieve. mixture. Weigh 15 grams of flaked rice stalks, place them in a stirring tank, add 5ml of polyvinyl acetate emulsion, stir for 1 min, so that the rice stalks are evenly wetted by the emulsion, then weigh 15 grams of stalks with a degree of polymerization of 3000 and a degree of alcoholysis of 99% polyvinyl alcohol short filaments are added to the raw material tank, and stirred for 1 minute to evenly mix the rice straw and the adhesive. Put the mixed material into an iron mold coated with simethicone oil, place the mold with the material between platens at a temperature of 160°C, pressurize to 7MPa, heat press for 12min, remove the mold, and cool to After 30°C, the mold was opened to obtain the straw-based composite material.

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Abstract

The invention relates to a straw base composite material and a preparation method thereof. Straws which are sliced serve as the main raw material of the composite material, and a thermoplastic macromolecule binding agent which is similar to the straws in structure and high in compatibility and has a certain polymerization degree and polar groups is adopted. The straw base composite material comprises the following raw materials in percentage by mass: 50 to 80 percent of straws and 50 to 20 percent of binding agent. The straws and the binding agent are uniformly mixed under a medium of water and aqueous emulsion, simultaneously micro-adjustment and modification of the composite material are realized, and the mixture is thermally molded in an iron die or a stainless steel die. The straw raw material is specially treated, the thermoplastic macromolecule binding agent is selected, and a method for mixing the raw materials in the special medium is adopted, so that the prepared composite material is extremely high in compatibility and relatively high in strength and comprehensive performance, can be machined into products for daily use, articles and toys and has wide application prospect.

Description

[0001] technical field [0002] The invention relates to a rice stalk-based composite material and a preparation method thereof, in particular to a composite material in which rice stalks in the form of filaments are the main raw material and a preparation method thereof. Background technique [0003] With the growth of the world's population and people's pursuit of a high-level life, the demand for natural resources in human society is increasing day by day, resulting in an increasingly obvious shortage of non-renewable resources. , causing solid waste to accumulate everywhere, with no place to bury it; water and air resources are polluted, threatening human health. Environmental pollution is a by-product of economic development. On the one hand, environmental pollution aggravates the shortage of available water resources, biological resources, and land resources, and on the other hand, it directly endangers human health. Making full use of renewable resources and developi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L29/04C08L3/02C08L1/26C08L25/06C08L33/10C08L31/04C08J3/05C08J3/02B27N3/08
Inventor 吴传保尹健美曾湘晖刘利江
Owner JIUJIANG UNIVERSITY
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