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A preparation method of cross-linked modified straw fiber/pp wood-plastic composite material and the resulting product

The technology of wood-plastic composite material and straw fiber is applied in the field of preparation of PP wood-plastic composite material, which can solve problems such as poor environmental protection and water pollution, and achieve the effects of good environmental protection, good application prospect and low price.

Active Publication Date: 2020-08-11
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the follow-up treatment of alkaline waste liquid is not good, it will easily cause water pollution and poor environmental protection.

Method used

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  • A preparation method of cross-linked modified straw fiber/pp wood-plastic composite material and the resulting product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare the wood-plastic composite material according to the following method, and the steps are as follows:

[0034] 1) Cross-linking modification of straw fiber

[0035] a. Dry the corn stalks in an air-blast drying oven at 80°C for 24 hours, peel off the corn stalks to obtain the husks, pulverize the stalks with an ultra-fine pulverizer, and pass through a 100-mesh standard sieve to obtain straw powder;

[0036] b. Dissolve 0.8g of chitosan in 40mL of acetic acid aqueous solution with a mass concentration of 2wt.%, and ultrasonically disperse until a uniform transparent jelly is formed;

[0037]c. Add 4g of KH560 dropwise into 400mL of 90wt% ethanol aqueous solution, and stir for 30min to obtain a hydrolyzate;

[0038] d. Add 20g of liquid paraffin, 1g of sodium dodecylbenzenesulfonate and 5g of straw powder to the jelly in step b, heat up to 60°C, and stir for 40min;

[0039] e. Add the KH560 hydrolyzate in step c to step d, adjust the pH to 7, and stir at 40°...

Embodiment 2

[0045] Prepare the wood-plastic composite material according to the following method, and the steps are as follows:

[0046] 1) Cross-linking modification of straw fiber

[0047] a. Dry the wheat straw in an air-blast drying oven at 80°C for 24 hours, pulverize the straw through an ultrafine grinder, and pass through a 100-mesh standard sieve to obtain straw powder;

[0048] b. Dissolve 0.5g of chitosan in 40mL of acetic acid aqueous solution with a mass concentration of 2wt.%, and ultrasonically disperse until a uniform transparent jelly is formed;

[0049] c. Add 2g of KH560 dropwise into 100mL of 80wt% ethanol aqueous solution and stir for 40min to obtain a hydrolyzate;

[0050] d. Add 10g of liquid paraffin, 0.5g of sodium dodecylbenzenesulfonate and 5g of straw powder to the jelly in step b, heat up to 65°C, and stir for 40min;

[0051] e. Add the KH560 hydrolyzate in step c to step d, adjust the pH to 8, and stir at 50°C for 2 hours to obtain a uniformly dispersed ...

Embodiment 3

[0057] Prepare the wood-plastic composite material according to the following method, and the steps are as follows:

[0058] 1) Cross-linking modification of straw fiber

[0059] a. Dry the rice straw in an air-blast drying oven at 80°C for 24 hours, pulverize the straw through an ultrafine grinder, and pass through a 100-mesh standard sieve to obtain straw powder;

[0060] b. Dissolve 0.5g of chitosan in 40mL of acetic acid aqueous solution with a mass concentration of 1wt.%, and ultrasonically disperse until a uniform transparent jelly is formed;

[0061] c. Add 3g of KH560 dropwise into 200mL of 85wt% ethanol aqueous solution, and stir for 30min to obtain a hydrolyzate;

[0062] d. Add 30g of liquid paraffin, 1g of sodium dodecylbenzenesulfonate and 5g of straw powder to the jelly in step b, heat up to 60°C, and stir for 40min;

[0063] e. Add the KH560 hydrolyzate in step c to step d, adjust the pH to 10, and stir at 40°C for 3 hours to obtain a uniformly dispersed s...

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Abstract

The invention discloses a preparation method of a crosslinking modified straw fiber / PP (polypropylene) wood-plastic composite material and an obtained product. The preparation method comprises the following steps: modifying straws serving as a raw material by adopting chitosan and KH560, then uniformly mixing the modified straw fiber with PP, a lubricating agent and an antioxidant, and extruding and molding the mixture to obtain a product. According to the preparation method disclosed by the invention, the straw fiber is subjected to crosslinking pretreatment, so that the shortcomings of easyauto-aggregation of the straw fiber and low compatibility with a polymer matrix are overcome, the compatibility of the straw fiber and the PP matrix is improved, and the interface performance of the straw fiber and the PP is improved, and then the adding amount of the straw fiber can be up to 40 percent; the recycling utilization rate of the straw fiber is greatly increased; a new way is found forthe application of the straw fiber crop in the field of wood-plastic composite materials.

Description

technical field [0001] The present invention relates to a method for preparing a straw fiber reinforced PP composite material and the product obtained, in particular to a method for preparing a cross-linked modified straw fiber reinforced PP wood-plastic composite material and the product obtained, belonging to the technical field of wood-plastic composite materials . Background technique [0002] Wood-plastic board is a new type of composite material that has been booming at home and abroad in recent years. It mainly uses thermoplastics such as polyethylene, polypropylene and polyvinyl chloride and a certain proportion of wood fiber as the main raw materials, and then extruded, molded, Plates or profiles produced by injection molding and other processing techniques. Wood-plastic panels are mainly used in building materials, furniture, logistics packaging and other industries. However, the supply of wood resources in our country is in short supply, so looking for a wood su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L97/02C08L5/08C08L91/06C08J3/24
CPCC08J3/24C08J3/246C08J2397/02C08J2405/08C08L23/12C08L2205/035C08L97/02C08L5/08C08L91/06
Inventor 葛曷一刘珊珊陈娟邹玉魏文秀
Owner UNIV OF JINAN
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