Method for preparing wood-plastic composite by blending heat-treated plant fiber with plastic

A wood-plastic composite material and plant fiber technology, which is applied in the field of wood-plastic composite material preparation, can solve the problems of composite materials such as low water resistance, low water absorption rate, dimensional stability, and poor interface compatibility, so as to reduce hydrophilicity Sex, color and luster are simple and elegant, and the effect of improving dimensional stability

Inactive Publication Date: 2009-11-18
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the poor interfacial compatibility of wood flour and plastics, especially the problems of low water resistance, easy warping and poor dimensional stability of composite materials. The principle of hydroxyl, under the condition of hypoxia, the plant fiber is heat-treated at 140-350°C for a certain period of time, and then compounded with thermoplastics to obtain a new type of wood-plastic composite material. The prepared composite material has low water absorption, high strength, and modulus. Large size, good dimensional stability, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Sieve the crushed wood flour with 120 mesh to make wood flour powder with relatively consistent size. The pulverized plant fibers are placed in a pyrolysis furnace, and heat-treated under the condition of cutting off oxygen, the heat-treatment time is 12 hours, and the temperature is 250°C.

[0027] 2. Take 60kg of modified wood powder, add 32kg of LDPE, 2kg of oleic acid, 5 parts of maleic anhydride grafted polypropylene, and 1 part of white oil, and mix evenly under high-speed stirring to make a mixture. The rotational speed of the mixer is 1800r / min, and the mixing time is 10min.

[0028] 3. Reactively extrude the mixed material in a twin-screw extruder, and the residence time of the mixed material in the screw is 12 minutes. The twin-screw extruder adopts PTW-24 from HAAKE Company in Germany, and the temperature of each section of the extruder is: 145°C, 150°C, 155°C, 155°C, 155°C, 155°C.

[0029] 4. After the extruded material is cooled, it is pelletized by a ...

Embodiment 2

[0031] 1. Sieve the pulverized bamboo powder with 20 meshes to make bamboo powder with relatively consistent size. Take 70kg of bamboo powder and place it in a pyrolysis furnace equipped with a stirrer and a thermometer. Under low-speed stirring at a rotation speed of 400r / min, high-temperature steam is continuously introduced for heat treatment to obtain heat-treated modified bamboo powder. The heat treatment time is 1h, and the high-temperature steam temperature is 340°C.

[0032] 2. Take 60kg of modified wood powder, add HDPE plastic 50kg, oleic acid 2kg, polyethylene wax 5kg, silane coupling agent K5601.5kg, zinc stearate 1kg, styrene-butadiene copolymer (SBS) 3kg was mixed evenly under high-speed stirring to make a mixed material. The rotating speed of the mixer is 6000r / min, and the mixing time is 15min.

[0033] 3. Reactively extrude the mixed material in a twin-screw extruder, and the residence time of the mixed material in the screw is 5 minutes. The twin-screw ext...

Embodiment 3

[0036] 1. Sieve the crushed wheat straw powder with 60 meshes to make wheat straw powder with relatively uniform size. Take 100 kg of wheat straw powder and place it in a pyrolysis furnace with a stirrer and a thermometer. Under low-speed stirring at a speed of 400 r / min, nitrogen gas is continuously fed in for heat treatment to obtain heat-treated modified wheat straw powder. The heat treatment time is 20h, and the temperature is 140°C.

[0037] 2. Take 60kg of modified wheat straw powder, add 30kg of PS (polystyrene) plastic, 5kg of oleic acid, 4kg of polyethylene wax, 1.0kg of titanate coupling agent, 2kg of zinc stearate, styrene-butadiene Copolymer (SBS) 7kg is mixed under high-speed stirring to make mixed material. The rotating speed of the mixer is 8000r / min, and the mixing time is 15min.

[0038] 3. Reactively extrude the mixed material in a twin-screw extruder, and the residence time of the mixed material in the screw is 5 minutes. The twin-screw extruder adopts PT...

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Abstract

The invention relates to a method for preparing a wood-plastic composite, in particular to a method for preparing a wood-plastic composite by blending heat-treated plant fibers with plastics. The method comprises the following steps of: crushing the plant fiber, screening the crushed plant fiber by a sieve of 20-120 meshes to prepare the plant fiber powders; carrying out heat treatment on the crushed plant fiber under an oxygen deficient condition, wherein the heat treatment time is 0.5-24h, the temperature is 140-350 DEG C and the preferably selected temperature range is 180-250 DEG C; uniformly mixing the plastic, a lubricant, a plasticizer, a stabilizer, a compatibilizer and the plant fiber modified by heat treatment to prepare the mixture under the high-speed mixing condition with the rotation speed of 800-1000r / min; and extruding the mixture out of a twin-screw extruder after reaction; and granulating and obtaining granules or directly extruding and obtaining the product by a die. The heat-treated plant fiber powder reduces the amount of hydroxy groups, the hydrophilicity and the water absorption of the final product and improves the dimension stability.

Description

technical field [0001] The invention relates to a preparation method of a wood-plastic composite material, in particular to a preparation method of a wood-plastic composite material blended with heat-treated plant fibers and plastics. Background technique [0002] Wood Plastic Composites (WPC for short) is the use of plant fiber materials such as wood powder, bamboo powder, rice husk, straw, etc. and polymer resin matrix such as PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (polyvinyl chloride), PET (polyethylene terephthalate), ABS (acrylonitrile-styrene-butadiene copolymer), PA (nylon), etc. New Materials. Wood-plastic composite material has the advantages of both wood and plastic. It has better water absorption resistance, aging resistance and warping resistance than traditional wood, and its cost is lower than that of pure wood or plastic. It can be widely used in military industry (such as Butts, gun racks, etc.), light industry (such as furniture, hand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L101/00C08L23/06C08L25/06B29C47/00B29C47/92B29C48/40B29C48/92
CPCB29C48/04B29C48/40
Inventor 陈清松丁富传周发青赖寿莲李晓燕
Owner FUJIAN NORMAL UNIV
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