CN1482165A - Wood plastic foamed material and machine-shaping process thereof - Google Patents

Wood plastic foamed material and machine-shaping process thereof Download PDF

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Publication number
CN1482165A
CN1482165A CNA021579490A CN02157949A CN1482165A CN 1482165 A CN1482165 A CN 1482165A CN A021579490 A CNA021579490 A CN A021579490A CN 02157949 A CN02157949 A CN 02157949A CN 1482165 A CN1482165 A CN 1482165A
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CN
China
Prior art keywords
wood
agent
part
foam material
plastic foam
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CNA021579490A
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Chinese (zh)
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CN1252165C (en
Inventor
伟 韩
韩伟
贾正华
宣德庆
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北京欧尼克环保技术有限公司
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Priority to CN 02157949 priority Critical patent/CN1252165C/en
Publication of CN1482165A publication Critical patent/CN1482165A/en
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Publication of CN1252165C publication Critical patent/CN1252165C/en

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Abstract

The foamed wood-plastic material is produced with plastic, wood dust, mineral stuffing, assistant, modifier, foaming agent, etc. in certain proportion and through mixing, heating to fusion, foaming and forming in a heat forming apparatus. It has continuous homogeneous pores, and is light, high in specific strength, waterproof, anticorrosive and heat insulating, and may be nailed, sawn and planed, so that it may be used widely in building, transportation, packing, household decoration and daily use articles.

Description

Wood-plastic foam material and processing and forming technology thereof

Technical field:

The present invention relates to a kind of Wood-plastic foam material and processing and forming technology thereof.

Background technology:

The contriver had once submitted a patent application about plastic-wood section in November, 2000, and application number is 00132561.2.Further research and development of products and user's feedback information shows, the density of the profiled material of wood plastic composite preparation is generally about 1.1-1.4, make the material deadweight than higher, can't satisfy in light weight, shock resistance, high heat insulation requirement, with reference to existing pure plastic foamed technology, in conjunction with the own characteristic of Wood-plastic material, we have invented Wood-plastic foam material and processing and forming technology thereof.

Summary of the invention:

The objective of the invention is to solve the deficiencies in the prior art, a kind of Wood-plastic foam material and processing and forming technology thereof are provided.

Above purpose of the present invention is to realize by following technique means.

Described Wood-plastic foam material is meant by following raw materials according and mixes by weight that concrete ratio and raw material are as follows:

Plastics 20-80 part

Wood powder 10-70 part

Mineral filler 0-10 part

Auxiliary agent 0.5-4 part

Properties-correcting agent 1-4 part

Whipping agent 0.2-3 part

Described plastics are meant thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, ABS, also can be partial cross-linked through adding phase solvent or linking agent, the recovery plastics to raise variety that dynamic vulcanization is handled or directly used.Dynamic vulcanization can be dosed binary, terpolymer EP rubber, SBS etc. and carry out dynamic vulcanization or partial cross-linking to improve material property through sulphur, superoxide when handling.

Described wood powder can be wood chips, bamboo bits, agricultural crop straw powder, rice wheat husk powder, beans, W-Gum, cotton shell, nut duricrust, coconut husk etc.

Described mineral filler can be lime carbonate, diatomite mica, talcum powder, process white, kaolin, hollow glass micropearl etc.

Described auxiliary agent is phase solvent, blowing promotor etc.; Phase solvent can be a maleic anhydride class graft polyolefin, also can be CPE, ACR, EVA, EAA etc.

Described properties-correcting agent comprises:

A. wood powder coupling agent: silane coupling agent, titante coupling agent or aluminic acid ester, aluminium titante coupling agent;

B. dispersion agent, surfactant;

C. lubricant: stearic acid and its esters, low molecular weight polyethylene wax, low-molecular polypropylene wax, oxidized polyethlene wax, palm wax, paraffin, montanin wax etc.

Described whipping agent promptly can be pneumatogen such as sodium bicarbonate, CO 2Deng, also can be chemical foaming agent such as even helium diformamide, Diisopropyl azodicarboxylate etc.

The processing and forming technology of this Wood-plastic foam material is:

A. wood powder being weighed adds in the high speed mixing roll, with the wood powder oven dry, adds properties-correcting agent and makes the wood powder activation under 110-120 ℃ of temperature;

B. add after auxiliary agent, plastics and whipping agent mix, blowing goes into to be cooled to 40 ℃ in the cold mixer when 120 ℃ of material temperature, but becomes foam mixture;

C. the gained material is dropped in the forcing machine hopper, extrude through forcing machine, through foaming mould foaming cooling and shaping, be shaped to the special-shaped foamed products of different shape, or drop in other processing units, as foaming in injector or the hot-die molding machine is the Wood-plastic foam goods of desired shape, and these goods are a kind of novel wood-plastic foam materials with continuous uniform distribution foaming micropore.

Must notice in the technology that foaming mould is releasing pattern progressively, the die gap magnification is 0.5-10 times, according to different foamed profiles, sheet material desired density decision burst size, the extrusion foaming material is through the cooling and shaping sync pulling, and customized cut-off becomes desired size, and foam material density is between 0.1-0.9.

The present invention has the following advantages:

1. this Wood-plastic foam material has the characteristics of light weight, specific tenacity height, waterproof, anticorrosion, insulation, and the processing characteristic that has timber can follow closely, can saw, can dig;

2. this Wood-plastic foam material can be widely used in building, transportation, packing, home decoration and daily necessities market.

Embodiment:

Now in conjunction with specific embodiments the present invention is further detailed.

Embodiment 1.

Adopt following raw materials according:

20 parts of PE

65 parts of wood powders

8 parts of light calcium carbonates

4 parts of phase solvents (MHA-g-PE)

1 part of coupling agent

1 part of lubricant (Hst)

0.5 part of whipping agent (Ac)

0.5 part of blowing promotor (ZnO)

Wood powder is added in the high speed mixing roll, dry under 110-120 ℃ of temperature, add properties-correcting agent and make the wood powder activation, after adding auxiliary agent, plastics and whipping agent mixed, blowing went into to be cooled to 40 ℃ in the cold mixer when expecting warm 120 ℃, but became foam mixture.

This compound is dropped in the φ 65/132 tapered twin screw extruder, and Heating temperature is: 155 ℃, 165 ℃, 175 ℃, 180 ℃, 175 ℃; Melt pressure 9-15Mpa; Melt temperature 165-170 ℃; Engine speed 10-15rpm/min.

Through the mould foaming cooling and shaping of particular design, be shaped to the Wood-plastic foam product of the continuous uniform distribution foaming of the band micropore of different shape, density is 0.58-0.9.

Embodiment 2.

Adopt following raw materials according:

45 parts of PP

45 parts of wood powders

5 parts of hollow glass micropearls

1.5 parts of phase solvents (MHA-g-PE)

0.5 part of coupling agent

0.2 part of lubricant (Hst)

0.5 part in oxidation inhibitor

0.2 part of linking agent

1 part of additional crosslinker

0.6 part of whipping agent (Ac)

0.5 part of blowing promotor (ZnO)

Wood powder is added in the high speed mixing roll, dry under 110-120 ℃ of temperature, add properties-correcting agent and make the wood powder activation, after adding auxiliary agent, plastics and whipping agent mixed, blowing went into to be cooled to 40 ℃ in the cold mixer when expecting warm 120 ℃, but became foam material.

But should drop in φ 65 single screw extrusion machines by foam material, processing temperature is: 175 ℃, 195 ℃, 210 ℃, 195 ℃; Screw speed 40rpm/min.

Foaming in the hot-die molding machine is shaped to the Wood-plastic foam product with continuous uniform distribution foaming micropore, and density is 0.65-0.8.

Embodiment 3.

Adopt following raw materials according:

65 parts of PE

25 parts of wood powders

4 parts of process whites

2.5 parts of phase solvents

0.5 part of coupling agent

1 part of lubricant

1.5 parts of whipping agents (Ac)

0.5 part of blowing promotor (ZnO)

Wood powder is added in the high speed mixing roll, dry under 110-120 ℃ of temperature, add properties-correcting agent and make the wood powder activation, after adding auxiliary agent, plastics and whipping agent mixed, blowing went into to be cooled to 40 ℃ in the cold mixer when expecting warm 120 ℃, but became foam material.

But should drop in φ 65 single screw extrusion machines by foam material, processing temperature is: 160 ℃, 170 ℃, 185 ℃, 170 ℃; Screw speed 35rpm/min.

Foaming in the hot-die molding machine is shaped to the Wood-plastic foam product with continuous uniform distribution foaming micropore, and density is 0.45-0.6.

Embodiment 4.

Adopt following raw materials according:

80 parts of PVC

10 parts of wood powders

3 parts of complex lead salts

3 parts of properties-correcting agent (ACR)

1 part of lubricant

2.5 parts of whipping agents

0.5 part of blowing promotor

Wood powder is added in the high speed mixing roll, dry under 110-120 ℃ of temperature, add properties-correcting agent and make the wood powder activation, after adding auxiliary agent, plastics and whipping agent mixed, blowing went into to be cooled to 40 ℃ in the cold mixer when 120 ℃ of material temperature, but becomes foam material.

But should drop in the φ 65/132 tapered twin screw extruder by foam material, processing temperature is: 160 ℃, 170 ℃, 175 ℃, 170 ℃; Melt pressure 8-15Mpa; 165 ℃ of melt temperatures; Screw speed 15rpm/min.

Drop in the injector, be shaped to the Wood-plastic foam product of the continuous uniform distribution foaming of the band micropore of different shape, density is 0.9.

The foregoing description does not limit protection scope of the present invention, and modification that all are made without departing from theon the basis of the spirit of the present invention and improvement all belong to the scope of protection of present invention.

Claims (9)

1. Wood-plastic foam material, it is characterized in that: described Wood-plastic foam material is meant by following raw materials according and mixes by weight that concrete ratio and raw material are as follows:
Plastics 20-80 part
Wood powder 10-70 part
Mineral filler 0-10 part
Auxiliary agent 0.5-2 part
Properties-correcting agent 1-4 part
Whipping agent 0.2-4 part.
2. Wood-plastic foam material according to claim 1, it is characterized in that: described plastics are meant thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, ABS, also can be partial cross-linked through adding phase solvent or linking agent, the recovery plastics to raise variety that dynamic vulcanization is handled or that directly use.
3. Wood-plastic foam material according to claim 1 is characterized in that: described wood powder can be wood chips, bamboo bits, agricultural crop straw powder, rice wheat husk powder, beans, W-Gum, cotton shell, nut duricrust, coconut husk etc.
4. Wood-plastic foam material according to claim 1 is characterized in that: described auxiliary agent is phase solvent, blowing promotor etc.; Phase solvent can be a toxilic acid liver class graft polyolefin, also can be CPE, ACR, EVA, EAA etc.
5. Wood-plastic foam material according to claim 1 is characterized in that: described properties-correcting agent comprises:
A. wood powder coupling agent: silane coupling agent, titante coupling agent or aluminic acid ester, aluminium titante coupling agent;
B. dispersion agent, surfactant,
C. lubricant: stearic acid and its esters, low molecular weight polyethylene wax, low-molecular polypropylene wax, oxidized polyethlene wax, palm wax, paraffin, montanin wax etc.
6. Wood-plastic foam material according to claim 1 is characterized in that: described whipping agent promptly can be pneumatogen sodium bicarbonate, CO 2Deng, also can be chemical foaming agent, even helium diformamide, Diisopropyl azodicarboxylate etc.
7. Wood-plastic foam material according to claim 1 is characterized in that: described mineral filler can be lime carbonate, diatomite mica, talcum powder, process white, kaolin, hollow glass micropearl etc.
8. the processing and forming technology of Wood-plastic foam material is characterized in that, the processing step below adopting:
A. by following proportioning raw materials weighing:
Plastics 20-80 part
Wood powder 10-70 part
Mineral filler 0-10 part
Auxiliary agent 0.5-4 part
Properties-correcting agent 1-4 part
Whipping agent 0.2-3 part;
B. wood powder is added in the high speed mixing roll, under 110-120 ℃ of temperature,, add properties-correcting agent and make the wood powder activation the wood powder oven dry;
C. add after auxiliary agent, plastics and whipping agent mix, blowing goes into to be cooled to 40 ℃ in the cold mixer when 120 ℃ of material temperature, but becomes foam mixture;
C. this compound is dropped in the forcing machine hopper, extrude,, or drop into foaming in injector or the hot-die molding machine through foaming mould foaming cooling and shaping through forcing machine.
9. the machine-shaping of Wood-plastic foam material according to claim 8, it is characterized in that: foaming mould is releasing pattern progressively, the die gap magnification from 0.5-10 doubly, according to different foamed profiles, sheet material desired density decision burst size, the extrusion foaming material is through the cooling and shaping sync pulling, customized cut-off becomes desired size, and foam material density is between 0.1-0.9.
CN 02157949 2002-12-23 2002-12-23 Wood plastic foamed material and machine-shaping process thereof CN1252165C (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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