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Wood-plastic composite material and preparation method thereof

A technology of wood-plastic composite materials and fiber materials, which is applied in the field of fiber material composition and its preparation, can solve the problems of poor compatibility and weak strength of wood-plastic composite materials, achieve low water expansion rate, improve compatibility, The effect of high impact strength

Inactive Publication Date: 2014-08-20
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in the preparation process of the above-mentioned modified wood-plastic composite materials, only a compatibilizer is used to directly mix wood powder and plastics, because wood powder is a polar polymer compound with a large number of polar groups on the surface, and Plastic is a kind of 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 material and preparation method thereof
  • Wood-plastic composite material and preparation method thereof
  • Wood-plastic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1. Prepare materials according to the following proportions by weight:

[0059]

[0060]

[0061] 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, the chlorine content is 40-80%; the nitrogen content of ammonium polyphosphate is 22%-25%, the phosphorus content is ≥20%, and the molecular weight is >10 5 .

[0062] Wherein, the modified plant fiber is prepared according to the following steps:

[0063] A) Cut the agricultural waste cotton stalks into 20-40mm long cotton stalk material sections, put them in the blaster (Beijing Forestry University; model: BL-08), open the steam inlet valve of the blaster, and let the relative pressure into 3.0MPa Saturated water vapor, so th...

Embodiment 2

[0077] 1. Prepare materials according to the following proportions by weight:

[0078]

[0079] 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 maleic anhydride grafted polypropylene is 12000-300000, and the grafting ratio 1.5-2.5%, melt index 0.3-1.2g / 10min. 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°C); nitrogen content of ammonium polyphosphate is 22%-25%, phosphorus content ≥ 20%, molecular weight > 10 5 .

[0080] Wherein, the modified plant fiber is prepared according to the following steps:

[0081] A) Cut agricultural waste cotton stalks into 20-40mm long cotton stalk material sections, place them in the blaster, open the steam inlet valve of the blaster, and feed saturated steam with a relative pressure of 4.0MPa to make the relative pressure in the blaster The pressure reaches 2.5MPa, an...

Embodiment 3

[0088] 1. Prepare materials according to the following proportions by weight:

[0089]

[0090] Among them, the molecular weight of high-density polyethylene (HDPE) is 40,000-300,000, and the density is 0.94g / 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.

[0091] Wherein, the modified plant fiber is prepared according to the following steps:

[0092] A) Cut agricultural waste cotton stalks into 20-40mm long cotton stalk material sections, place them in the blaster and open the steam inlet valve of the blaster, and feed saturated steam with a relative pressure of 2.5MPa to make the relative pressure in the blaster Reach 1.5MPa, keep under this pressure for 45min, and steam the cotton stalk material;

[0093] B) Open the discharge valve of the blaster, make the cotton stalk material burst into the normal pressure receiving contain...

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Abstract

The invention discloses a wood-plastic composite material and a preparation method thereof. The wood-plastic composite material is prepared from the following raw materials in part by weight: 30 to 80 parts of modified plant fiber, 20 to 70 parts of plastic, 2 to 10 parts of compatilizer, 2 to 10 parts of lubricant, 0.2 to 1.0 part of antioxidant, 5 to 15 parts of filler and 2 to 10 parts of flame retardant. The preparation method comprises the following steps of: preparing the modified plant fiber which is separated from each other and of which the surface is coated with lignin by using wood fiber, namely cotton stalks by a blasting treatment method, compounding the modified plant fiber and the plastic, and extruding to form a finished product material. By the method, the technical problem of low compatibility of wood fiber and thermoplastic plastic is solved, the comprehensive utilization of the wood fiber and the plastic is realized, timber can be replaced, and the added value of agricultural waste, namely the cotton stalks is increased. The prepared wood-plastic composite material has good mechanical properties, and high tensile strength, bending strength and impact strength; and the industrialized production of high-performance products such as constructional engineering materials is realized.

Description

technical field [0001] The invention relates to a fiber material composition and a preparation method thereof, in particular to a plant fiber-containing wood-plastic composite material and a preparation method thereof. Background technique [0002] my country is a country with poor forest resources. Especially when my country's economy enters the stage of rapid development, the demand for wood is increasing day by day. The overuse of forest resources, the sharp decrease of the total forest area and the implementation of natural forest protection projects have intensified the contradiction between wood supply and demand. [0003] As a residue in the agricultural production process, cotton stalks have an annual output of about 20 million tons, most of which are not used, and most of them are disposed of by burning or natural decay, causing serious environmental pollution and resources. waste. How to deal with cotton stalks has become a subject of research and solution for man...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L97/02C08L23/06C08L23/12C08L51/06C08L23/28D21B1/36B29B9/06B29C47/00B29C43/00B29C45/00
Inventor 樊永明李建章吴玉英张学铭
Owner BEIJING FORESTRY UNIVERSITY
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