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CN102492245A - Formula and method for producing wood-plastic composite material by utilizing waste polyvinyl chloride cable materials - Google Patents

Formula and method for producing wood-plastic composite material by utilizing waste polyvinyl chloride cable materials Download PDF

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Publication number
CN102492245A
CN102492245A CN2011104268082A CN201110426808A CN102492245A CN 102492245 A CN102492245 A CN 102492245A CN 2011104268082 A CN2011104268082 A CN 2011104268082A CN 201110426808 A CN201110426808 A CN 201110426808A CN 102492245 A CN102492245 A CN 102492245A
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CN
China
Prior art keywords
polyvinyl chloride
chloride cable
plastic composite
composite material
waste polyvinyl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2011104268082A
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Chinese (zh)
Inventor
聂莉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TIANJIN DINGSHENGHAO TECHNOLOGY DEVELOPMENT CO LTD
Original Assignee
TIANJIN DINGSHENGHAO TECHNOLOGY DEVELOPMENT CO LTD
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TIANJIN DINGSHENGHAO TECHNOLOGY DEVELOPMENT CO LTD filed Critical TIANJIN DINGSHENGHAO TECHNOLOGY DEVELOPMENT CO LTD
Priority to CN2011104268082A priority Critical patent/CN102492245A/en
Publication of CN102492245A publication Critical patent/CN102492245A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/04Particle-shaped
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/92Measuring, controlling or regulating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92504Controlled parameter
    • B29C2948/9258Velocity
    • B29C2948/9259Angular velocity
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92819Location or phase of control
    • B29C2948/92857Extrusion unit
    • B29C2948/92876Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92885Screw or gear

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

The invention particularly relates to a formula and a processing method for producing a wood-plastic composite material by utilizing waste polyvinyl chloride cable materials. The method comprises the following steps: adding raw materials, namely waste polyvinyl chloride cable particles, pure polyvinyl chloride powder, wood powder, a metal soap type stabilizer, a coupling agent, a plasticizer, chlorinated polyethylene, methacrylic acid polyester and a lubricating agent, which are prepared according to the formula, into a high-speed mixing machine for mixing, and adding the well mixed raw materials into an extruding machine for extrusion forming. The polyvinyl chloride raw materials adopted by the method are outer skins of the waste and old cables, which are obtained by disassembling the domestic waste, which is low in price and conductive to environment protection. Most of plastic additives adopted in the method are non-toxic or low-toxicity products, therefore the material hardly harms human bodies and the environment during the production and the using process.

Description

Utilize the prescription and the method for waste polyvinyl chloride cable producing wood-plastic composite material
Technical field
The present invention relates to a kind of recovery and utilization of waste or used plastics, particularly relate to a kind of prescription and working method of utilizing the waste polyvinyl chloride cable producing wood-plastic composite material.
Background technology
In the preparation research that carries out wood plastic composite; It all is the pure material of commercial grade that the SE that is adopted is gone up basically; Some utilizes reclaimed materials, also is the leftover bits that in polrvinyl chloride product is produced, occur or some quality transparent polyvinyl chloride goods preferably, and its cost is higher.And the waste polyvinyl chloride cable material that utilizes low price is produced Wood-plastic material, does not also appear in the newspapers.
CABLE MATERIALS is as the crust of electric wire; Be exposed in the physical environment throughout the year; Stand that sunlight is exposed to the sun, the erosion of rain drop erosion, sea water immersion, acid and alkali corrosion and metal elements in soil and bacterium, oxidizing reaction and other chemical reactions never stopped, very about-face has taken place in its internal structure; If carrying out recycling as the pure material of plastics, its performance can not satisfy production requirement.Dissolution method is generally adopted in the recycling of waste polyvinyl chloride electric wire crust.Pvc sheath on waste electric wire, the cable may be dissolved in the appropriate solvent, and softening agent, pigment and other organic additive also get into polyvinyl chloride solution.After removing metal and other impurity, evaporating solvent can obtain containing the thick SE reclaimed materials of these additives, can be used for making products such as the lower floor of requirement, gardening hose, but this process is comparatively complicated, and most of optional solvent is poisonous.The another kind of method that comparatively generally adopts be with behind waste polyvinyl chloride cable crust granulation again and pure material mix and make cable sheath again.But this employing reclaimed materials is processed cable, in insulativity, weathering resistance with can not show a candle to the product of processing with pure material on work-ing life, and has very big potential safety hazard.
Summary of the invention
The object of the invention is exactly to utilize problem again for what solve the waste polyvinyl chloride cable material; A kind of prescription and working method of utilizing the waste polyvinyl chloride cable producing wood-plastic composite material is provided, and the additives for plastics that in manufacturing processed, uses nontoxic or low toxicity is to reach environmental requirement.
The present invention is for realizing above-mentioned purpose, and the technical scheme that is adopted is: a kind of waste polyvinyl chloride cable producing wood-plastic composite material prescription that utilizes is characterized in that: prepared by following component and parts by weight proportioning:
Waste polyvinyl chloride cable particle 70 ~ 100;
Pure polyvinyl chloride powder 0 ~ 30;
Wood powder 40 ~ 60;
Metallic soap class stablizer 0 ~ 0.75;
Coupling agent 2 ~ 3;
Softening agent 0 ~ 3;
Chlorinatedpolyethylene 5 ~ 6;
The polynary ester 5 ~ 6 of methylacrylic acid;
Lubricant 0.5 ~ 0.7.
A kind of working method of utilizing the waste polyvinyl chloride cable producing wood-plastic composite material is characterized in that: comprise the steps:
1) will add high-speed mixer and mixing according to the raw material of formulated, mixing temperature is 100 ℃ ~ 110 ℃, and mixing time is 20 ~ 35 minutes;
2) mixed raw materials is added in the forcing machine extrude, the forcing machine engine speed is: 40 ~ 60 rev/mins, the feeding machine rotating speed is: 4 ~ 6 rev/mins; Carry out the press polish typing after extruding.
Extrudate is touched typing and is gone up the rolling press press polish through sheet type mouth, through cooling, section, promptly gets described wood-plastic composite panel then.
The wood plastic composite that present method is produced is to be main raw material with waste polyvinyl chloride cable material, wood powder, through adding various functional agents and a spot of pure SE, and mixing extruding in twin screw extruder.It has following characteristics:
(1) product is low to the wood fibre requirement, can adopt the waste material and the rice husk the like waste that produce in the wood working;
(2) product surface is smooth, smooth and firm, and can suppress solid pattern and other shapes;
(3) product surface need not reprocessed, and the cross-sectional structure of goods is evenly fine and close;
(4) defective of no timber-work is like: knot, diagonal lamination, rotten etc.;
(5) goods have good physical and mechanical property, and water-tolerant;
(6) the goods workability is good, can follow closely, bores, saws, dig;
(7) can add various tinting materials, process coloured prod;
(8) time limit of service is longer, and upkeep cost is cheap.
Wood Plastics Composite Product is because of having the advantage of timber and plastics concurrently, thereby is widely used in a lot of fields, like all respects of national products such as furniture, building, industry, shipping vehicle, packed and transported.
The SE raw material that present method adopted is that domestic waste and old cable is disassembled the waste and old cable sheath that enterprise is disassembled out, and is cheap, and helps environment protection.The additives for plastics that present method adopted is most of for nontoxic or low toxicity product, and is very little to human body and environmental hazard in material produce and use.
Embodiment
A kind of waste polyvinyl chloride cable producing wood-plastic composite material prescription that utilizes, prepare by following component and parts by weight proportioning:
Waste polyvinyl chloride cable particle 70 ~ 100;
Pure polyvinyl chloride powder 0 ~ 30;
Wood powder 40 ~ 60;
Metallic soap class stablizer 0 ~ 0.75;
Coupling agent 2 ~ 3;
Softening agent 0 ~ 3;
Chlorinatedpolyethylene 5 ~ 6;
The polynary ester 5 ~ 6 of methylacrylic acid;
Lubricant 0.5 ~ 0.7.
The waste polyvinyl chloride cable granularity is 20 ~ 30 purpose particles.Metal soap stabilisers comprises calcium-zinc composite stabilizing agent or barium zinc composite stabilizer.Wood powder is poplar powder or China fir powder or pine powder or bamboo wood powder, and its fineness is 40 ~ 60 orders, and water cut is less than 2%.Coupling agent is titanic acid ester or aluminate coupling agent.Softening agent is a DOP.Lubricant is a calcium stearate.
A kind of working method of utilizing the waste polyvinyl chloride cable producing wood-plastic composite material comprises the steps:
1) will add high-speed mixer and mixing according to the raw material of formulated, mixing temperature is 100 ℃ ~ 110 ℃, and mixing time is 20 ~ 35 minutes;
2) mixed raw materials is added in the forcing machine extrude, the forcing machine engine speed is: 40 ~ 60 rev/mins, the feeding machine rotating speed is: 4 ~ 6 rev/mins; Carry out the press polish typing after extruding.
Extrudate is touched typing and is gone up the rolling press press polish through sheet type mouth, through cooling, section, promptly gets described wood-plastic composite panel then.Forcing machine is a twin screw extruder.
Above-mentioned waste polyvinyl chloride cable material is according to the material of transparent polyvinyl chloride electricwire conduit, white PVC electric wire crust, black pvc wire outer skin pipe, and practical implementation is following:
Embodiment 1:
1. the transparent polyvinyl chloride electricwire conduit is ground into 20 purpose particles through kibbler, and cleans.Polyvinyl chloride particles after cleaning is dried down in 100 ℃ in air dry oven.
2. 40 purpose bamboo wood powders were dried 3 hours down in 100 ℃ in air dry oven, its water cut is dropped to below 2%.
3. carry out the configuration of raw material according to following table 1:
Table 1
Material component Parts by weight
Transparent polyvinyl chloride cable particle 100
The bamboo wood powder 40
Titanate coupling agent 2
Chlorinatedpolyethylene 5
The polynary ester of methylacrylic acid 5
Calcium stearate 0.5
4. the waste and old transparent polyvinyl chloride CABLE MATERIALS in the above-mentioned formula material and chlorinatedpolyethylene, the polynary ester of methylacrylic acid, calcium stearate are put into the high mixer mixing simultaneously, mixing temperature is 100 ℃, mixes;
5. bamboo wood powder in the above-mentioned formula material and titanate coupling agent are added the high mixer mixing, mixing temperature is 105 ℃, mixes.
6. two groups of high mixed in the step 4 and 5 raw materials are put into high mixer and carry out height and mix, mixing temperature is 110 ℃, and mixing time is 15 minutes;
7. step 6 mixed raw materials is put into twin screw extruder and carry out mixing extruding; Barrel zone temperature is 150 ℃, and head temperature is 160 ℃, 60 rev/mins of screw extrusion press engine speeds; The feeding machine rotating speed is 6 rev/mins, and is mixing after sheet type machine head port mould extrusion sheet.
8. the sheet material in the step 7 gets in the rolling press and carries out press polish, and two roller spacings of rolling press are 5 millimeters.
9. mould sheet material through the wood of press polish in the step 8 and after overcooling, cutting, be white polyvinyl chloride based wood-plastic composite sheet.
Embodiment 2:
1, white PVC electric wire crust is ground into 25 order particles through kibbler, and cleans.Polyvinyl chloride particles after cleaning is dried down in 100 ℃ in air dry oven.
2. 50 purpose China fir powder were dried 4 hours down in 100 ℃ in air dry oven, its water cut is dropped to below 2%.
3. carry out the configuration of raw material according to following table 2:
Table 2
Material component Parts by weight
White polyvinyl chloride cable particle 80
Pure polyvinyl chloride powder 20
The China fir powder 60
Calcium-zinc composite stabilizing agent 0.5
Titanate coupling agent 3
DOP (softening agent) 2
Chlorinatedpolyethylene 5.5
The polynary ester of methylacrylic acid 5.5
Calcium stearate (lubricant) 0.6
4. the waste and old white polyvinyl chloride cable material in the above-mentioned formula material and stablizer, chlorinatedpolyethylene, the polynary ester of methylacrylic acid, softening agent, calcium stearate are put into the high mixer mixing simultaneously, mixing temperature is 110 ℃, mixes;
5. China fir powder in the above-mentioned formula material and titanate coupling agent are added the high mixer mixing, mixing temperature is 105 ℃, mixes.
6. two groups of high mixed in the step 4 and 5 raw materials are put into high mixer and mix, mixing temperature is 105 ℃, and mixing time is 20 minutes;
7. step 6 mixed raw materials is put into twin screw extruder and carry out mixing extruding; Barrel zone temperature is 145 ℃, and head temperature is 155 ℃, and the screw extrusion press engine speed is 50 rev/mins; The feeding machine rotating speed is 5 rev/mins, and is mixing after sheet type machine head port mould extrusion sheet.
8. the sheet material in the step 7 gets in the rolling press and carries out press polish, and two roller spacings of rolling press are 5 millimeters.
9. mould sheet material through the wood of press polish in the step 8 and after overcooling, cutting, be the polyvinyl chloride based wood-plastic composite sheet.
Embodiment 3:
1. black pvc wire outer skin pipe is ground into 30 purpose particles through kibbler, and cleans.Polyvinyl chloride particles after cleaning is dried down in 100 ℃ in air dry oven.
2. 40 purpose poplar powder were dried 3 hours down in 100 ℃ in air dry oven, its water cut is dropped to below 2%.
3. carry out the raw material configuration according to following table 3:
Table 3
Material component Parts by weight
Black pvc cable particle 70
Pure polyvinyl chloride powder 30
The poplar powder 50
The zinc-cadmium combined stablizer of barium 0.75
Aluminate coupling agent 2.5
DOP (softening agent) 3
Chlorinatedpolyethylene 6
The polynary ester of methylacrylic acid 6
Calcium stearate (lubricant) 0.7
4. the black pvc CABLE MATERIALS in the above-mentioned formula material and stablizer, chlorinatedpolyethylene, the polynary ester of methylacrylic acid, softening agent, calcium stearate are put into the high mixer mixing simultaneously, mixing temperature is 110 ℃, mixes;
5. wood powder in the above-mentioned formula material and coupling agent are added the high mixer mixing, mixing temperature is 105 ℃, mixes.
6. two groups of high mixed in the step 4 and 5 raw materials are put into high mixer and mix, mixing temperature is 110 ℃, and mixing time is 35 minutes;
7. step 6 mixed raw materials is put into twin screw extruder and carry out mixing extruding; Barrel zone temperature is 150 ℃, and head temperature is 160 ℃, and the screw extrusion press engine speed is 40 rev/mins; The feeding machine rotating speed is 4 rev/mins, and is mixing after sheet type machine head port mould extrusion sheet.
8. carry out press polish in the sheet material entering rolling press in the step 7, two roller spacings of rolling press are 8 millimeters.
9. mould sheet material through the wood of press polish in the step 8 and after overcooling, cutting, be black pvc sill plastic composite board.
A kind of prescription and working method of utilizing the waste polyvinyl chloride cable producing wood-plastic composite material that the present invention proposes; Be described through embodiment; Person skilled obviously can be changed or suitably change and combination making method as herein described in not breaking away from content of the present invention, spirit and scope; Realize technology of the present invention; Special needs to be pointed out is, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as and are included in spirit of the present invention, scope and the content.

Claims (9)

1. one kind is utilized waste polyvinyl chloride cable producing wood-plastic composite material prescription, it is characterized in that: prepared by following component and parts by weight proportioning: waste polyvinyl chloride cable particle 70 ~ 100; Pure polyvinyl chloride powder 0 ~ 30; Wood powder 40 ~ 60;
Metallic soap class stablizer 0 ~ 0.75; Coupling agent 2 ~ 3; Softening agent 0 ~ 3; Chlorinatedpolyethylene 5 ~ 6; The polynary ester 5 ~ 6 of methylacrylic acid; Lubricant 0.5 ~ 0.7.
2. the waste polyvinyl chloride cable producing wood-plastic composite material prescription that utilizes according to claim 1 is characterized in that: described waste polyvinyl chloride cable granularity is 20 ~ 30 purpose particles.
3. the waste polyvinyl chloride cable producing wood-plastic composite material prescription that utilizes according to claim 1 is characterized in that: described metal soap stabilisers comprises calcium-zinc composite stabilizing agent or barium zinc composite stabilizer.
4. the waste polyvinyl chloride cable producing wood-plastic composite material prescription that utilizes according to claim 1, it is characterized in that: described wood powder is poplar powder or China fir powder or pine powder, and its fineness is 40 ~ 60 orders, and water cut is less than 2%.
5. the waste polyvinyl chloride cable producing wood-plastic composite material prescription that utilizes according to claim 1, it is characterized in that: described coupling agent is titanic acid ester or aluminate coupling agent.
6. the waste polyvinyl chloride cable producing wood-plastic composite material prescription that utilizes according to claim 1, it is characterized in that: described softening agent is a DOP.
7. the waste polyvinyl chloride cable producing wood-plastic composite material prescription that utilizes according to claim 1, it is characterized in that: described lubricant is a calcium stearate.
8. a working method of utilizing the waste polyvinyl chloride cable producing wood-plastic composite material is characterized in that: comprise the steps:
1) will add high-speed mixer and mixing according to the raw material of formulated, mixing temperature is 100 ℃ ~ 110 ℃, and mixing time is 20 ~ 35 minutes;
2) mixed raw materials is added in the forcing machine extrude, the forcing machine engine speed is: 40 ~ 60 rev/mins, the feeding machine rotating speed is: 4 ~ 6 rev/mins; Carry out the press polish typing after extruding.
9. the working method of utilizing the waste polyvinyl chloride cable producing wood-plastic composite material according to claim 2 is characterized in that: described forcing machine is a twin screw extruder.
CN2011104268082A 2011-12-19 2011-12-19 Formula and method for producing wood-plastic composite material by utilizing waste polyvinyl chloride cable materials Pending CN102492245A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011104268082A CN102492245A (en) 2011-12-19 2011-12-19 Formula and method for producing wood-plastic composite material by utilizing waste polyvinyl chloride cable materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011104268082A CN102492245A (en) 2011-12-19 2011-12-19 Formula and method for producing wood-plastic composite material by utilizing waste polyvinyl chloride cable materials

Publications (1)

Publication Number Publication Date
CN102492245A true CN102492245A (en) 2012-06-13

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103319810A (en) * 2013-06-17 2013-09-25 内蒙古亿利塑业有限责任公司 Salix mongolica/polyvinyl chloride wood-plastic composite material and production method thereof
CN105348671A (en) * 2015-11-13 2016-02-24 安徽广源科技发展有限公司 An environmental-friendly recoverable degradable building composite material
CN105504585A (en) * 2015-12-29 2016-04-20 楷佳(天津)新材料科技有限公司 a wood-plastic material
CN106398036A (en) * 2016-08-31 2017-02-15 余姚市楷瑞电子有限公司 Method for preparing wood-plastic composite material

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020091178A1 (en) * 2001-01-05 2002-07-11 Hossein Amin-Javaheri Polyvinyl chloride composition
CN1500832A (en) * 2002-11-18 2004-06-02 华昌工贸有限公司 Polyvinyl chloride (PVC) plastic-wood panel
CN1948384A (en) * 2005-10-12 2007-04-18 北京化工大学 Wood plastic micro foaming composite material and its processing shaping method
CN101275003A (en) * 2008-04-30 2008-10-01 天津大学 Formulation and method of producing wood-plastic composite material by using waste polyvinyl chloride cable material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020091178A1 (en) * 2001-01-05 2002-07-11 Hossein Amin-Javaheri Polyvinyl chloride composition
CN1500832A (en) * 2002-11-18 2004-06-02 华昌工贸有限公司 Polyvinyl chloride (PVC) plastic-wood panel
CN1948384A (en) * 2005-10-12 2007-04-18 北京化工大学 Wood plastic micro foaming composite material and its processing shaping method
CN101275003A (en) * 2008-04-30 2008-10-01 天津大学 Formulation and method of producing wood-plastic composite material by using waste polyvinyl chloride cable material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103319810A (en) * 2013-06-17 2013-09-25 内蒙古亿利塑业有限责任公司 Salix mongolica/polyvinyl chloride wood-plastic composite material and production method thereof
CN103319810B (en) * 2013-06-17 2016-06-15 内蒙古亿利塑业有限责任公司 Cortex Salicis Cheilophilae/Polyvinyl chloride wood-plastic composite material and preparation method thereof
CN105348671A (en) * 2015-11-13 2016-02-24 安徽广源科技发展有限公司 An environmental-friendly recoverable degradable building composite material
CN105504585A (en) * 2015-12-29 2016-04-20 楷佳(天津)新材料科技有限公司 a wood-plastic material
CN106398036A (en) * 2016-08-31 2017-02-15 余姚市楷瑞电子有限公司 Method for preparing wood-plastic composite material

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