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Water-resistant wood-plastic composite material and preparation method thereof

A wood-plastic composite material and wood powder technology, applied in the field of composite materials, can solve the problems of poor impact resistance and easy combustion, and achieve the effects of good dimensional stability, low water absorption, and enhanced composite effect and mechanical properties.

Inactive Publication Date: 2011-05-04
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A Chinese patent application with the application number 200710072795.7 discloses a micro-foamed polystyrene-based wood-plastic composite material and its preparation method, which uses silane coupling agents, titanate coupling agents, aluminate coupling agent, isocyanate, maleic anhydride, phthalic anhydride, polymethylene polyphenylisocyanate, maleic anhydride-modified polystyrene or maleic anhydride-modified polypropylene as a coupling agent to prepare wood-plastic composites material, which solves the problems of poor impact resistance and easy burning of wood-plastic composite materials

Method used

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  • Water-resistant wood-plastic composite material and preparation method thereof
  • Water-resistant wood-plastic composite material and preparation method thereof
  • Water-resistant wood-plastic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Soak the wood flour with 1mol / L NaOH aqueous solution, the bath ratio (i.e. the mass ratio of wood flour to NaOH aqueous solution) is 1:15, then wash with deionized water until neutral, and then dry at 105°C for 24 hours to obtain the modified wood powder. pink.

[0045] Add 40Kg of modified wood flour and 3Kg of polysebacic anhydride to a SHR-10A high-speed mixer (Zhangjiagang Light Industry Machinery Factory), pass cooling water, pre-mix at 70°C for 10 minutes, then add 57Kg of high-density polyethylene to continue mixing , after mixing evenly, discharge the mixed powder and cool it for later use.

[0046] Add the above-mentioned mixed powder into a TSE-16-TC twin-screw extruder (PRISM company), melt, blend, extrude and granulate at 200 ° C, and use the HTF86 × 1 injection molding machine (Haitian company) at 200 °C after drying. ℃, 22.5MPa injection molding, made of water-resistant wood-plastic composites.

Embodiment 2

[0048] Soak the wood flour with 1mol / L NaOH aqueous solution, the bath ratio (i.e. the mass ratio of wood flour to NaOH aqueous solution) is 1:15, then wash with deionized water until neutral, and then dry at 105°C for 24 hours to obtain the modified wood powder. pink.

[0049] Add 40Kg of modified wood flour and 3Kg of polyazelaic anhydride to a SHR-10A high-speed mixer (Zhangjiagang Light Industry Machinery Factory), pass cooling water, pre-mix at 70°C for 10 minutes, then add 57Kg of high-density polyethylene to continue mixing , after mixing evenly, discharge the mixed powder and cool it for later use.

[0050] Add the above-mentioned mixed powder into a TSE-16-TC twin-screw extruder (PRISM company), melt, blend, extrude and granulate at 200 ° C, and use the HTF86 × 1 injection molding machine (Haitian company) at 200 °C after drying. ℃, 22.5MPa injection molding, made of water-resistant wood-plastic composites.

Embodiment 3

[0052] Soak the wood flour with 0.1mol / L NaOH aqueous solution, the bath ratio (i.e. the mass ratio of wood flour to NaOH aqueous solution) is 1:20, then wash with deionized water until neutral, and then dry at 103°C for 25 hours to obtain modified wood flour.

[0053] Add 65Kg of modified wood flour and 10Kg of polysebacic anhydride to a SHR-10A high-speed mixer (Zhangjiagang Light Industry Machinery Factory), pass cooling water, pre-mix at 80°C for 20 minutes, then add 25Kg of high-density polyethylene to continue mixing , after mixing evenly, discharge the mixed powder and cool it for later use.

[0054] Add the above-mentioned mixed powder into a TSE-16-TC twin-screw extruder (PRISM company), melt, blend, extrude and granulate at 200 ° C, and use the HTF86 × 1 injection molding machine (Haitian company) at 200 °C after drying. ℃, 22.5MPa injection molding, made of water-resistant wood-plastic composite materials.

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Abstract

The invention discloses a water-resistant wood-plastic composite material, which is prepared from the following raw materials in percentage by weight: 1-65% modified wood powder, 25-98% of polyolefin matrix and 1-10% compatilizer; wherein, the compatilizer is one of polysebacic polyanhydride (PSPA) and polyazelaic polyanhydride (PAPA) or both the two. The invention also discloses a preparation method of the water-resistant wood-plastic composite material. The method is as follows: PSPA and / or PAPA are / is utilized to carry out segmented surface grafting on the wood powder to improve the interface compatibility between the wood powder and polyethylene, and the wood powder is pretreated by alkali liquor to removing unstable substances, such as semi-cellulose and esters with small molecules, in the wood powder, thus enhancing the composite effect and the mechanical property of lignocellulose to the polyolefin matrix and obtaining the wood-plastic composite material with excellent mechanical property, low water absorption capacity and good dimensional stability; in addition, the operation of the preparation method is simple, and the method is applicable to industrial production.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a water-resistant wood-plastic composite material and a preparation method thereof. Background technique [0002] Wood-plastic composite (WPC) is prepared by compounding thermoplastics and wood fibers or plant fibers. This material has the dual characteristics of wood and plastics. High abrasiveness and impact resistance, the product can be recycled. However, due to the polarity of the wood flour surface and the resulting intermolecular hydrogen bonds, the dispersion and surface adhesion between the hydrophilic wood flour filler and the thermoplastic material are hindered. Therefore, it is necessary to modify the wood powder to eliminate or reduce its surface polarization degree and improve the composite effect of wood-plastic composite materials. [0003] At present, maleic anhydride-modified polyolefin resins are widely used at home and abroad, such as maleic anhydride graf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/00C08L23/06C08L23/12C08L97/00
Inventor 杨辉周箭王永虎宋利明
Owner ZHEJIANG UNIV
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