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Polyolefin wood-plastic composite with low rate of water absorption

A technology of wood-plastic composite materials and polyolefin, which is applied in the field of polyolefin wood-plastic composite materials, can solve the problems of wood-plastic composite materials with poor woody appearance, easy mold of wood powder, low content of plant fiber powder, etc., and achieve appearance simulation Good wood effect, high content of plant fiber powder, and improved freeze-thaw resistance

Inactive Publication Date: 2011-07-06
HANGZHOU NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water absorption rate of these wood-plastic composite materials must be very low. If the water absorption rate is too high, a series of problems will occur in the outdoor environment: after absorbing water, the resistance to fungal decay will be reduced, and the wood powder in the material is easy to mold and rot, and is resistant to freezing. The melting stability becomes worse, the mechanical strength decreases significantly after absorbing water, etc.
However, reducing the content of plant fibers will increase the cost and make the appearance of wood-plastic composites worse; adding a coupling agent will not only increase the cost, but also reduce the water absorption to a limited extent.
As a result, the plant fiber powder content of existing wood-plastic composite materials is not high (<60%), and the actual saturated water absorption rate of wood-plastic products is on the high side (24h water absorption rate is not high, but after the water absorption time is longer, the water absorption rate will be higher. Larger), this may be an important reason why the current wood-plastic composite materials are prone to mold and rot after being used outdoors for a long time

Method used

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  • Polyolefin wood-plastic composite with low rate of water absorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1. Preparation of modified plant fiber

[0059] The quality formula of plant fiber modification is as follows:

[0060] 100 parts of dry plant fiber powder (fir powder, 80 mesh)

[0061] 4 parts flax oil

[0062] The preparation process of modified plant fiber is as follows:

[0063] Drying the plant fiber powder with an airflow cyclone dryer or other drying equipment until the water content is lower than 2%, to obtain a dry plant fiber powder;

[0064] Weigh the plant fiber powder according to the formula and add it to the high-speed mixer, slowly add the metered dry oil while stirring at high speed, stir well and gradually heat up to 100°C, discharge the material, let it stand until the dry oil solidifies, and obtain the modified Vegetable fiber powder.

[0065] 2. Preparation of modified plastics

[0066] The plastic modified quality formula is as follows:

[0067] Recycle 100 copies of waste PE

[0068] 3 parts maleic anhydride

[0069] Styrene 1.5 parts

...

Embodiment 2～5

[0091] The preparation process of Examples 2-5 is the same as that of Example 1, except that the formula is different. The formulations of Examples 2-5 are shown in Table 2 to Table 4.

[0092] Table 2: Preparation formula of modified plant fiber powder

[0093] Example

[0094] Table 3: Preparation formula of modified plastics

[0095] Example

[0096] Table 4: Preparation formula of wood-plastic composites

[0097]

[0098] After testing, the wood-plastic composite materials prepared according to the above formula all have low water absorption (the absorption rate is lower than 3% after soaking in water for 2 months), and have good tensile strength, bending strength and impact strength.

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Abstract

The invention provides a polyolefin wood-plastic composite with low rate of water absorption, which is prepared by main raw materials including modified plant fiber and modified plastic; by the modification of the plant fiber and the plastic, the invention can prepare wood-plastic composite with rate of water absorption that is much lower than that of normal wood-plastic composite, contributing topreventing mildew, decay and water-absorbing deformation of the wood-plastic composite and improving freezing and fusion resistance thereof; drying oil has excellent antiseptic and mildew-proof resistance and can prominently ameliorate the freezing and fusion resistance of the wood-plastic composite after being absorbed by the plant fiber; on account of the modification of the plant fiber and theplastic, the obtained wood-plastic composite has mechanical strength that is uncommonly higher than general wood-plastic composite, and has the advantages of low rate of water absorption, high content of plant fiber powder, good artificial effect of appearance, high strength, low cost and the like.

Description

(1) Technical field [0001] The invention relates to a polyolefin wood-plastic composite material with a low water absorption rate, in particular to a polyolefin wood-plastic composite material with a low water absorption rate prepared from agricultural and forestry waste and waste plastics as main raw materials. (2) Background technology [0002] Wood-Plastic Composites (WPC for short) is a kind of material prepared by high-temperature extrusion (or injection molding, pressing, etc.) A new composite material whose appearance and performance are similar to natural wood, and its products are mainly used as a substitute for natural wood. [0003] The plant fiber powder used in the preparation of wood-plastic composite materials is mainly agricultural and forestry waste, such as wood powder, bamboo powder, bran powder, crop straw powder, etc.; the plastics used are mainly waste thermoplastics, such as polyethylene (PE), polypropylene ( PP) etc. The development of wood-plastic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L101/00C08L23/00C08L97/02
Inventor 吕群李姗姗
Owner HANGZHOU NORMAL UNIVERSITY
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