Preparation method of modified straw powder, modified straw powder and biodegradable material

A technology for biodegradable materials and modified straw, which is applied in the field of preparation of modified straw powder, can solve problems such as poor biodegradation performance and poor mechanical strength, and achieve the effects of improving mechanical strength and improving biodegradation performance.

Active Publication Date: 2010-03-03
日照新东港农业开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of poor biodegradability and poor mechanical strength of natural straw composite plastics in the prior art, to provide a method for preparing modified s...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0011] The invention provides a method for preparing modified straw powder, wherein the method comprises contacting straw powder with an aqueous solution of a modifier at 80-100° C. for 1-4 hours, and mixing the resultant with a modifier in the presence of a solvent The contacted product is reacted with allyl chloride at 100-120° C. for 1-8 hours to obtain modified straw powder, the modifying agent is alkali or acid, and the solvent is a solvent capable of dissolving allyl chloride.

[0012] The present invention does not limit the type of straw powder, and powders of common grasses such as crop stems can be selected, such as one or more of rice straw powder, wheat straw powder, corn straw powder, and sesame straw powder. However, the inventors of the present invention found that when the straw powder is a mixture of rice straw powder and wheat straw powder, and the weight ratio of rice straw powder and wheat straw powder is 1-10:1, the biological The biodegradability of the d...

Embodiment approach

[0021] According to a preferred embodiment of the preparation method of the modified straw powder provided by the present invention, the specific operation steps of the preparation method of the modified straw powder include: first, washing and drying the straw and pulverizing it into straw powder with a pulverizer, and using A 50-200 mesh sieve is used to select straw powder with a particle size of 0.03-2 mm; then, the obtained straw powder is reacted with an aqueous solution of a modifier in a reaction kettle at 80-100°C for 1-4 hours and then filtered, and the obtained solid is used for Wash with distilled water, dry at 60-90°C for 1-3 hours, and pulverize again with a pulverizer, use a 200-mesh sieve to select straw powder with a particle size of 20-100 microns; The straw powder, allyl chloride and solvent are added into the reactor, stirred and reacted at 100-120 DEG C for 1-8 hours, and the solvent is removed after the reaction to obtain the modified straw powder.

[002...

Embodiment 1

[0029] This example is used to illustrate the modified straw powder and biodegradable materials provided by the present invention and their preparation methods.

[0030] (1) Straw raw material processing

[0031] Cut the wheat stalks into small pieces of about 20 cm, clean them and dry them at 60°C, then crush the wheat stalks with a high-speed pulverizer, and pass through a 50-mesh sieve to select wheat stalk powder raw materials with a particle size of less than 2 mm.

[0032] (2) Preparation of modified straw powder

[0033] Add 100 parts by weight of the wheat stalk powder raw material obtained in (1) and 100 parts by weight of sodium hydroxide aqueous solution (containing 12% by weight of sodium hydroxide) into the reaction kettle, fully stir at 80° C. for 4 hours, filter, and The solid was washed to neutrality, then dried at 60°C for 3 hours and pulverized again, and the particle size was selected with a 200-mesh sieve to be less than 100 microns; the above-mentioned wh...

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PUM

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Abstract

The invention provides a preparation method of modified straw powder. The method comprises the following steps of: contacting straw powder and an aqueous solution of a modifier at a temperature between 80 and 100 DEG C for 1 to 4 hours; and reacting a product generated by the contact of the obtained substance and the modifier with allyl chloride at a temperature between 100 and 120 DEG C for 1 to8 hours in the presence of a solvent to obtain the modified straw powder. The modifier is alkali or acid, and the solvent can dissolve the allyl chloride. The invention also provides the modified straw powder, wherein the modified straw powder is prepared by the preparation method. The invention also provides a biodegradable material, which is prepared by melting a mixture containing the straw powder and base resin, wherein the straw powder is the modified straw powder. The biodegradable material adopts the modified straw powder so as to achieve good biodegradability and mechanical strength.

Description

technical field [0001] The invention relates to a preparation method of modified straw powder, modified straw powder prepared by the preparation method, and a biodegradable material prepared by using the modified straw powder. Background technique [0002] Straw is a kind of abundant and inexhaustible renewable natural polymer material. However, at present, straw resources have not been fully utilized, and there is a large surplus of straw resources in major agricultural production areas. The waste of resources and environmental pollution caused by incineration and returning to the field have aroused the attention of the whole society. Rational utilization of straw resources, realization of industrial utilization of straw resources, and environmental protection are directly related to the sustainable development of the national economy. [0003] On the other hand, with the rapid development of the plastics industry, the demand and output of plastic products are also increas...

Claims

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Application Information

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IPC IPC(8): C08H5/04C08L97/02C08L29/04C08L23/06C08L23/12C08L27/06C08L67/02C08L69/00C08L25/06B29C70/40
Inventor 赵婷婷饶先花杨卫国宫清
Owner 日照新东港农业开发有限公司
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