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Preparation method of silica sol surface modified straw wood-plastic composite material

A wood-plastic composite material and surface modification technology, which is applied in the field of wood-plastic composite materials, can solve the problems that the water absorption characteristics of straw powder are not significantly improved, the use performance, service life impact, and the proportion of straw powder is low. Strength, excellent mechanical properties, the effect of reducing water absorption

Inactive Publication Date: 2013-01-02
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese invention patent 200810146746.8, which firstly uses acidic or alkaline aqueous solution to treat straw powder, then uses a solvent containing allyl chloride to treat straw powder, and melts and extrudes the treated straw powder and resin material to obtain a Biodegradable materials, but the surface modification process is relatively complicated, and environmental problems such as waste acid, waste alkali, and solvent recovery may be generated during the modification process, and the modification cost is high
Chinese invention patent 200610040465.5 proposes to use raw materials such as alkali, urea and synergist to carry out fluffy active plasticization of straw powder in cooking equipment to obtain a fluffy active plasticized material with a moisture content of 15-24%, and then mix with various processing aids and thermoplastic resin blended and melt-extruded to prepare granular products, which can be used to prepare wood-plastic composite materials. However, it can be seen from the moisture content of straw powder after modification that the water absorption characteristics of straw powder have not been significantly improved, which will inevitably lead to Wood-plastic composite materials also have a high water absorption rate, which will greatly affect the performance and service life of the material
Chinese invention patent 200610070215.6 discloses impregnating straw powder with a mixture of butyl acrylate, dimethylaniline, and benzoyl peroxide, and reacting at 90-100°C for 3.5-4 hours to achieve surface modification of straw powder, and Straw wood-plastic composites were prepared by blending and extruding modified straw powder with processing aids and thermoplastic resins, but the proportion of straw powder in the material was low

Method used

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  • Preparation method of silica sol surface modified straw wood-plastic composite material

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Experimental program
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Effect test

Embodiment 1

[0022] Put 100 parts of cotton stalk powder with a size of 50 mesh and a water content of 9.0% into a 10-liter reactor, turn on the stirring equipment, and at the same time raise the temperature of the reactor to 50 ° C, and put 20 parts of SiO 2 The mass fraction is 60%, the pH value is 10.0, the viscosity is 10 centipoise, SiO 2 The silica sol with a particle size of 6 nanometers was added to the reaction kettle in a spray form within 1 hour, and the stirring was continued for 2 hours after the addition, and then the temperature was raised to 160°C under stirring conditions, and dried to obtain the surface modified cotton of the silica sol. Rod stalk powder. Take 100 parts of recovered HDPE, 150 parts of the above-mentioned silica sol surface modified straw powder, 10 parts of PE-g-MA, 5 parts of plastic processing aids and 20 parts of activated calcium carbonate, add them to the high-speed mixer, close the feed port of the mixer, Turn on the mixer, raise the temperature to...

Embodiment 2

[0024] Put 100 parts of corn stalk powder with a size of 90 mesh and a water content of 5.6% into a 10-liter reactor, turn on the stirring equipment, and at the same time raise the temperature of the reactor to 70 ° C, and put 120 parts of SiO 2 The mass fraction is 45%, the pH value is 8.5, the viscosity is 6.5 centipoise, SiO 2 The silica sol with a particle size of 15 nanometers was added into the reactor in a spray form within 1 hour, and the stirring was continued for 1.5 hours after the addition, and then the temperature was raised to 150°C under stirring conditions, and dried to obtain the surface-modified corn of the silica sol. rod powder. Take 100 parts of recycled ABS, 120 parts of the above-mentioned silica sol surface-modified corn stalk powder, 5 parts of ABS-g-MA, 8 parts of plastic processing aids and 25 parts of activated calcium carbonate, add them to the high-speed mixer, close the mixer and feed Turn on the mixer, raise the temperature to 65°C, and mix for...

Embodiment 3

[0026] Put 100 parts of wheat straw powder with a size of 70 mesh and a water content of 7.5% into a 10-liter reactor, turn on the stirring equipment, and at the same time raise the temperature of the reactor to 65 °C, add 80 parts of SiO 2 The mass fraction is 35%, the pH value is 7.5, the viscosity is 4 centipoise, SiO 2The silica sol with a particle size of 10 nanometers was added to the reactor in a spray form within 1.2 hours, and the stirring was continued for 1 hour after the addition, and then the temperature was raised to 140°C under stirring conditions, and dried to obtain the surface-modified corn of the silica sol. rod powder. Take 100 parts of recovered PS, 100 parts of the above-mentioned silica sol surface-modified wheat straw powder, 8 parts of PS-g-MA, 10 parts of plastic processing aid and 30 parts of activated calcium carbonate, add them to the high-speed mixer, close the mixer and feed Open the mixer, raise the temperature to 70°C, and mix for 20 minutes. ...

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Abstract

The invention discloses a preparation method of a silica sol surface modified straw wood-plastic composite material. The preparation method includes crushing and drying crop straws to obtain straw powders, using silica sol to soak the straw powders, drying the straw powders to obtain surface modified straw powders, mixing the surface modified straw powders, recycled plastics and other processing auxiliaries at a high speed, and then performing extrusion and granulation to obtain granules of the silica sol surface modified straw wood-plastic composite material. The prepared silica sol surface modified straw wood-plastic composite material is lower in water absorption rate and higher in strength, modulus, size stability and antiflaming performance.

Description

technical field [0001] The invention relates to a wood-plastic composite material, especially a preparation method of a surface-modified straw wood-plastic composite material. Background technique [0002] Crop straw is a renewable resource with abundant natural reserves. It has a wide range of sources and is rich in biological fiber. It is an important resource to replace wood fiber as a raw material. At present, the use of crop straw in my country is mainly used for incineration as fertilizer, or as fuel for farmers, and partly as roughage for livestock. In industrial use, it is mainly used in papermaking and synthetic board. This way of use not only causes a waste of resources, but also causes serious environmental pollution problems. This situation urgently requires us to open up new ways for the rational and effective utilization of straw. Because straw is rich in biological fiber resources, it can be used as a raw material to replace wood fiber in the manufacture of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L23/06C08L25/06C08L23/12C08L55/02C08L27/06C08K13/02C08K3/36C08K5/098C08K5/134
Inventor 石光林少全吴素萍
Owner SOUTH CHINA NORMAL UNIVERSITY
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