Wood plastic composite and preparation method thereof

A wood-plastic composite material and a manufacturing method technology, applied in the direction of separation of raw materials, etc., can solve the problems of poor compatibility and weak strength of wood-plastic composite materials, and achieve the effects of low water absorption expansion rate, improved compatibility, and high mechanical properties.

Inactive Publication Date: 2012-01-04
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in the preparation process of the above-mentioned wood-plastic composite materials, only a compatibilizer is used to directly react wood powder and plastics, because wood powder is a polar polymer compound with a large number of polar groups on the surface, while plastics are A non-polar high molecular polymer, the compatibility between the two is poor, and the strength of the prepared wood-plastic composite material is weak

Method used

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  • Wood plastic composite and preparation method thereof
  • Wood plastic composite and preparation method thereof
  • Wood plastic composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 1. Prepare materials according to the following proportions by weight:

[0067]

[0068] Among them, the molecular weight of high-density polyethylene (HDPE) is 40,000-300,000, and the density is 0.93-0.97g / cm 3 , the melt index (MI, g / 10min) is 0.3-0.5; the molecular weight of maleic anhydride grafted polyethylene is 10000-300000, the grafting rate is 1-2%, and the melt index is 0.5-0.6g / 10min; The molecular weight is 800-1300, and the chlorine content is 40-73%.

[0069] Wherein, the modified wood fiber is prepared according to the following steps:

[0070] A) Peel off the waste processing residues in the "Three Residues of Forestry" into a 20-40mm waste section and place it in the blaster (Beijing Forestry University; model: BL-08), open the steam inlet valve of the blaster, Introduce saturated water vapor with a relative pressure of 3.5MPa to make the relative pressure in the blaster reach 2.5MPa, keep it under this pressure for 30min, and steam the veneer wood...

Embodiment 2

[0083] 1. Prepare materials according to the following proportions by weight:

[0084]

[0085] Wherein, the molecular weight of described low-density polyethylene (LDPE) is 20000-30000, density 0.91g / cm 3 , melt index 0.5g / 10min; molecular weight of chlorinated polyethylene is 10000-300000, chlorine content is 40-60%.

[0086] Wherein, the modified wood fiber is prepared according to the following steps:

[0087] A) Cut the twig wood in the waste harvesting residues in the "three forestry residues" into waste sections with a length of 20-40 mm and place them in the blaster, open the steam inlet valve of the blaster, and feed in a relative pressure of 4.2 MPa Saturated water vapor, so that the relative pressure in the blaster reaches 4.0MPa, and keep it under the pressure of 4.0MPa for 5 minutes, and steam the waste of "three forestry residues";

[0088] B) Open the discharge valve of the blaster, so that the wood waste of "three leftovers" is blasted and sprayed into the...

Embodiment 3

[0095] 1. Prepare materials according to the following proportions by weight:

[0096]

[0097] Wherein, the molecular weight of the polypropylene (PP) plastic is 10000-300000, the melt index (MI, g / 10min) is 0.2-1; the molecular weight of the chlorinated polypropylene is 80000-150000, and the chlorine content is 40-60% ; The molecular weight of polyethylene wax is 2500-3000, and the density is 0.92-0.94g / cm 3 , Viscosity 0.7-1.2Pa · s (140 ℃).

[0098] Wherein, the modified wood fiber is prepared according to the following steps:

[0099] A) The shrub chip mixture in the waste harvesting residues in the "three forestry residues" is cut into a waste section with a length of 20-40mm and placed in the blaster, and the steam inlet valve of the blaster is opened, and the relative pressure is 4.0 The saturated water vapor of MPa makes the relative pressure in the blaster reach 3.0MPa, and keep it under the pressure of 3.0MPa for 30min, and steam the shrub chips;

[0100] B) o...

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Abstract

The invention discloses a wood plastic composite and a preparation method thereof. The wood plastic composite comprises the following raw materials according to parts by weight: 30-80 parts of modified wood fiber, 20-70 parts of plastic, 2-10 parts of compatilizer, 2-10 parts of lubricant, 0.2-1.0 part of antioxidant, 5-15 parts of filler and 2-10 parts of fire retardant. 'forestry three waste' wood wastes are prepared onto modified wood fibers with an explosion treatment method, wherein the modified wood fibers are mutually separated, and eh surface of the modified wood fibers is covered with lignin; then the modified wood fiber is compounded with plastic; and the product is extruded to form finished product material. According to the wood plastic composite, the technical problems of poor compatibility of wood fiber and thermoplastic plastics can be solved to realize the purpose of comprehensively utilizing the 'forestry three waste' wood and plastic, the wood can be omitted, and the additional value of the forest residue is increased. The wood plastic composite manufactured with the preparation method has high mechanical property, and strong tensile strength, bending strength and impact strength of composite material, and the industrial production of high-performance products, such as building engineering materials, can be realized.

Description

technical field [0001] The invention relates to a composition of lignocellulosic material and natural polymer and a preparation method thereof, in particular to a wood-plastic composite material of "three forestry residues" waste and a preparation method thereof. Background technique [0002] The "three forestry residues" refer to harvesting residues (branches, twigs, treetops, roots and shrubs, etc.); Slats, wood and bamboo cuts, sawdust, broken veneer, wood core, shavings, sanding powder, wood blocks, leftovers, etc.). According to the sampling survey of logging areas in major forest regions in my country, the residues from logging and timber production (including trunk tips, branches and leaves) account for about 40% of forest biomass. Among them, the logging and timber residues that can be used for energy purposes account for about 20% of the total, and can be produced at 22 million tons per year. In 2008, the national log processing volume totaled 110.65 million m 3 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L23/06C08L23/12C08L51/06C08L23/28C08K13/02C08K3/34C08K5/09C08K3/26D21B1/36
Inventor 樊永明李建章吴玉英张学铭张谦
Owner BEIJING FORESTRY UNIVERSITY
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