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Nano-reinforced wood-plastic composite and preparation method thereof

A wood-plastic composite material and nano-reinforcement technology, which is applied in the field of nano-reinforced wood-plastic composite material and its preparation, can solve the problems of poor compatibility between wood fiber and plastic interface, difficulty in improving the quality of composite materials, and unfavorable uniform dispersion of wood fiber. Achieve the effect of increasing compatibility, improving mechanical properties and good dimensional stability

Inactive Publication Date: 2013-04-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the large amount of hydroxyl groups on the surface of wood fibers, which have a large polarity difference with plastics, the interface compatibility between untreated wood fibers and plastics is poor, which is not conducive to the uniform dispersion of wood fibers in the plastic matrix, and it is easy to form large particles at the interface between the two. Gaps, making it difficult to improve the quality of composite materials

Method used

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  • Nano-reinforced wood-plastic composite and preparation method thereof
  • Nano-reinforced wood-plastic composite and preparation method thereof
  • Nano-reinforced wood-plastic composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This example uses the weight ratio of raw materials as follows:

[0045]

[0046] Above-mentioned modified wood flour is prepared according to the following steps:

[0047] 1) Cut the wood waste into 10-20cm long and 0.05-0.1cm thick wood chips, put them into a hydrothermal reaction kettle (the mass ratio of wood waste to water is 1:5), and heat at 140°C for 1 hour;

[0048] 2) Soak the treated wood in a NaOH solution with a pH of 10 to neutralize the organic acid produced;

[0049] 3) The wood is washed with water, dried at 70° C. for 48 hours, pulverized, and then dried at 105° C. for 2 hours to obtain modified wood powder.

[0050]Add all the above-mentioned raw materials into a high-speed mixer, mix at 75°C for 10 minutes, and then add them to a twin-screw extruder to extrude and pelletize. ℃, zone 3, 4 and 5: 175°C, machine head: 175°C. The wood-plastic composite particles are hot-pressed at a temperature of 175°C and a pressure of 20Mpa. The transmission el...

Embodiment 2

[0052] This example uses the weight ratio of raw materials as follows:

[0053]

[0054]

[0055] Above-mentioned modified wood flour is prepared according to the following steps:

[0056] 1) Cut the wood waste into 10-20cm long and 0.05-0.1cm thick wood chips, put them into a hydrothermal reaction kettle (the mass ratio of wood waste to water is 1:6), and heat at 155°C for 1 hour;

[0057] 2) Soak the treated wood in a NaOH solution with a pH of 9 to neutralize the organic acid produced;

[0058] 3) The wood is washed with water, dried at 70° C. for 48 hours, pulverized, and then dried at 105° C. for 2 hours to obtain modified wood powder.

[0059] Add all the above-mentioned raw materials into a high-speed mixer, mix at 80°C for 10 minutes, and then add them to a twin-screw extruder to extrude and pelletize. ℃, zone 3, 4, 5: 180°C, machine head: 180°C. The wood-plastic composite particles are hot-pressed at a temperature of 175°C and a pressure of 20Mpa. The transm...

Embodiment 3

[0061] This example uses the weight ratio of raw materials as follows:

[0062]

[0063] Above-mentioned modified wood flour is prepared according to the following steps:

[0064] 1) Cut the wood waste into 10-20cm long and 0.05-0.1cm thick wood chips, put them into a hydrothermal reaction kettle (the mass ratio of wood waste to water is 1:4), and heat at 155°C for 1 hour;

[0065] 2) Soak the treated wood in a NaOH solution with a pH of 10 to neutralize the organic acid produced;

[0066] 3) The wood is washed with water, dried at 70° C. for 48 hours, pulverized, and then dried at 105° C. for 2 hours to obtain modified wood powder.

[0067] Put all the above-mentioned raw materials into a high-speed mixer, mix at 70°C for 15 minutes, and then add them to a twin-screw extruder to extrude and granulate. ℃, zone 3, 4 and 5: 175°C, machine head: 175°C. The wood-plastic composite particles are hot-pressed at a temperature of 175°C and a pressure of 20Mpa. The properties of ...

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Abstract

The invention discloses a nano-reinforced wood-plastic composite. The nano-reinforced wood-plastic composite comprises the following raw materials in parts by weight: 20-70 parts of modified wood meal, 30-80 parts of polyethylene resin, 2-10 parts of compatilizer, 2-10 parts of lubricating agent, 0.1-1 part of antioxidant, 0.1-1 part of light stabilizer and 0.5-6 parts of nanofiller; and the modified wood meal is obtained by carrying out hydro-thermal treatment on wood wastes. The invention also discloses a preparation method of the nano-reinforcing wood-plastic composite. The preparation method comprises the following steps of: mixing raw materials, and then extruding and pelletizing in an extruder, and finally thermally pressing and forming obtained wood-plastic composite particles. The nano-reinforced wood-plastic composite obtained by the invention is high in bending strength and tensile strength, low in water absorption and moisture content, good in dimensional stability and ageing resistance, long in service life, and capable of replacing wood, and reducing the consumption of timber resources, thereby playing a role in protecting the environment.

Description

technical field [0001] The invention relates to the field of composite material preparation, in particular to a nano-reinforced wood-plastic composite material and a preparation method thereof. Background technique [0002] Wood-plastic composites are modified thermoplastic materials filled and reinforced with wood fibers or plant fibers, which are extruded or pressed into profiles, panels or other products to replace wood and plastic products. The plastic matrix for preparing wood-plastic composite materials is mainly thermoplastics, commonly used are polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS) and the like. Plant fiber is used as a reinforcing material in thermoplastics, which has the advantages of high specific strength, low hardness, and less wear and tear on processing equipment. Wood-plastic composite materials have the advantages of both wood and plastic: good processability and easy molding; good mechanical properties and streng...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08L23/06B29C47/92B29C48/92
CPCB29B7/46B29B7/72B29B7/7461B29B7/90B29B9/06B29B9/12B29C48/04B29C48/40B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 丁新更陶磊杨辉
Owner ZHEJIANG UNIV
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