CN103554626A - Micro-foaming polyethylene-matrix wood-plastic composite material and preparation method thereof - Google Patents
Micro-foaming polyethylene-matrix wood-plastic composite material and preparation method thereof Download PDFInfo
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92561—Time, e.g. start, termination, duration or interruption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
- C08J2205/044—Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
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- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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- C08J2497/00—Characterised by the use of lignin-containing materials
- C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- C08L2207/062—HDPE
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- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Abstract
The invention discloses a micro-foaming polyethylene-matrix wood-plastic composite material and a preparation method thereof. The micro-foaming polyethylene-matrix wood-plastic composite material is prepared by the following steps of stirring a matrix polyethylene resin, modified wollastonite powder and talcum powder, a crosslinking agent, a lubricant, a heat balance type foaming agent, an antioxidant, an anti-ultraviolet agent, pigment and modified plant fiber, heating and uniformly mixing, then cooling and discharging to obtain a premix, wherein the modified plant fiber is one of wood powder, bamboo powder and rice hull powder or a mixture of two or more at any proportion; putting the premix into an extruder, and performing granulation, extrusion foaming and cooling formation. The micro-foaming polyethylene-matrix wood-plastic composite material disclosed by the invention is convenient to produce and manufacture, the raw materials are cheap and environment-friendly, the average diameter of the pores of the micro-foaming polyethylene-matrix wood-plastic composite material is reduced to 10 microns, and the content of the plant fiber is increased to 45%; moreover, the composite material has low density and high bending strength and impact toughness, is widely applicable and can be applied to the fields such as decoration, building, municipal administration, packaging, automotive upholsteries and the like.
Description
Technical field
The present invention relates to a kind of micro-polyethylene foamed base wood-plastic composite material and preparation method thereof, belong to field of compound material, also belong to Forestry Engineering field.
Background technology
Compare with Traditional Wood plastic composite materials, Wood-plastic foam matrix material is because the existence of abscess not only can reduce the density of material, and these bubbles can effectively stop the expansion of original crack in material, make crack tip rust, thereby give the more good thermostability of material and resistance to fatigue, in fields such as building decoration, indoor decoration, artwork market, packed and transported, automotive upholsteries, all there are wide market outlook.Polyethylene (PE), as general-purpose plastics, is compared with polypropylene (PP), cheap, has good resistance to low temperature; Compare with polyvinyl chloride (PVC), from being prepared into, use and even all more environmental protection of waste treatment; Therefore, adopting PE is that matrix is prepared fine foaming wood plastic composite materials and had resource, cost and environment-friendly advantage.
But the flexural strength of polyethylene based wood-plastic composite material is low, creep strain is large, and when vegetable fibre content is increased to 20%, the impelling strength of matrix material obviously decline, and a large amount of existence of vegetable fibre can increase the foaming difficulty of matrix material, affect the foam performance of material, and then the mechanical property of weakening material, affect the use of material.
Summary of the invention
The flexural strength that exists for above-mentioned micro-polyethylene foamed base wood-plastic composite material is low, poor impact toughness and the deficiency such as foaming difficulty is large, the object of this invention is to provide that a kind of cell morphology is good, vegetable fibre content is high, density is low, flexural strength and the high micro-polyethylene foamed base wood-plastic composite material of impelling strength and preparation method thereof.This method adopts chemically crosslinked and blending and modifying high density polyethylene(HDPE) and Low Density Polyethylene, prepare micro-polyethylene foamed base wood-plastic composite material, and adopt coupling agent modified talcum powder and wollastonite powder to strengthen toughness reinforcing foam composite material as modified filler, when improving micro-polyethylene foamed wood plastic composite foam performance, improve flexural strength and the impelling strength of material.This method is simple to operation, the inexpensive environmental protection of raw material, quality of materials is light, intensity is high, good toughness.
For achieving the above object, the present invention adopts following technical scheme:
Described micro-polyethylene foamed base wood-plastic composite material, is prepared from by the raw material that comprises following mass fraction:
100 parts of polyvinyl resins, 20 ~ 80 parts, vegetable fibre; 5 ~ 25 parts of talcum powder; 5 ~ 20 parts of wollastonites; 0.1 ~ 1.5 part of coupling agent; 0.5 ~ 3 part of lubricant; 0.5 ~ 3 part of whipping agent; 0.1 ~ 3 part of linking agent; 0.5 ~ 2 part of antioxidant; 0.5 ~ 2 part of anti UV agent; 1 ~ 7 part of interfacial compatibilizer; 1 ~ 3 part of pigment.
Described polyvinyl resin is comprised of Low Density Polyethylene and high density polyethylene(HDPE), described Low Density Polyethylene is that weight-average molecular weight Mw is 40000 ~ 200000, degree of crystallinity is 20% ~ 40%, at 230 ℃, the melt index under 2.16 KN test conditions is 90 parts of the Low Density Polyethylene pellet of 1-15 g/10min or powders; And weight-average molecular weight Mw is 50000 ~ 300000, degree of crystallinity is 70% ~ 90%, at 230 ℃, the melt index under 2.16 KN test conditions is 10 parts of the pellets of high density polyethylene of 2-10 g/10min or powders.
Described vegetable fibre is one or more mixtures that form with arbitrary proportion in wood powder, bamboo powder, powdered rice hulls, and water ratio is 1%-3%, and median size is 40 order ~ 120 orders; Described arbitrary proportion is the ratio of this area routine, the technology that can realize for those skilled in the art.
Described talcum powder median size is 1000 ~ 1500 orders.
Described wollastonite powder is needle-like, and length-to-diameter ratio is 10:1 ~ 20:1, and median size is 1000 order ~ 1500 orders.
Described coupling agent is this area routine techniques, preferred silane class of the present invention or titanate ester or aluminate coupling agent.
Described lubricant is this area routine techniques, the mixture of one or both in preferably polyethylene wax of the present invention or stearic acid or stearate.
Described whipping agent is this area routine techniques, the preferred thermal equilibrium type whipping agent of the present invention, and model is the Cellmic C 121 mixture of Hydrocell 232.
Described linking agent is this area routine techniques, the preferred dicumyl peroxide of the present invention (DCP), powdery, technical grade.
Described antioxidant is this area routine techniques, and the preferred hindered phenol anti-oxidants 1010 of the present invention and phosphorous acid esters antioxidant 168, with the composite mixture of 1:1 ratio.
Described anti UV agent is this area routine techniques, the preferred Octabenzone UV531 of the present invention.
Described pigment is this area routine techniques, the special-purpose pigment dyestuff of the inorganic pigment powders such as preferential oxidation iron of the present invention or plastics.
Described interfacial compatibilizer is this area routine techniques, metallocene ethene-1-octene copolymer of the polyethylene of the preferred acrylic compound class of the present invention grafting or the polypropylene of acrylic compound class grafting or the grafting of acrylic compound class.
The preferred maleic anhydride grafted polyethylene of polyethylene (MAPE) of acrylic compound class grafting; The preferred maleic anhydride inoculated polypropylene of polypropylene (MAPP) of acrylic compound class grafting; Metallocene ethene-1-octene copolymer preferred maleic anhydride graft metallocene ethene-1-octene copolymer (MAPOE) of acrylic compound class grafting.
Micro-polyethylene foamed base wood-plastic composite material of the present invention and preparation method thereof, its preparation process is:
1) talcum powder and wollastonite powder modification, dry talcum powder and wollastonite powder are put into high-speed mixer, stirring is warming up to 80 ~ 100 ℃, the ethanol that employing and volumetric concentration are 99% is with the coupling agent metering spray of 1:1 ~ 1:8 dilution proportion, stir after 10 ~ 30min, cooling discharging, makes modified filler;
2) by recipe ratio, take each raw material; Low Density Polyethylene (LDPE), high density polyethylene(HDPE) (HDPE), modified filler, linking agent, lubricant, whipping agent, antioxidant, anti UV agent, pigment, interfacial compatibilizer, dry vegetable fibre are put into high-speed mixer; stirring is warming up to 110 ~ 120 ℃; stir after 15 ~ 50 min; cooling discharging, makes Preblend;
3) by the wooden plastic particles of above-mentioned granulation, put into twin screw extruder, extrusion foaming legal system is for micro-polyethylene foamed base wood-plastic composite material; Extruder barrel temperature is that 165 ~ 180 ℃, head temperature are that 155 ~ 175 ℃, die temperature are 155 ~ 165 ℃.
Feature of the present invention is: adopt cross-linking modified and mode blending and modifying, improve the foam performance of polyethylene based wood-plastic composite material, adopt that Low Density Polyethylene is that weight-average molecular weight Mw is 40000 ~ 200000, degree of crystallinity is 20% ~ 40%, melt index (230 ℃, 2.16 KN) is LDPE pellet or the powder of 1-15 g/10min; Described high density polyethylene(HDPE) is that weight-average molecular weight Mw is 50000 ~ 300000, degree of crystallinity is 70% ~ 90%, (230 ℃ of melt indexs, 2.16KN) be HDPE pellet or the powder of 2-10 g/10min, make cross-linking modified with vegetable fibres such as wood powder, bamboo powder and blending and modifying is easier, simple and the environmental protection of operating process, the vegetable fibre content of micro-polyethylene foamed base wood-plastic composite material of preparation up to 45%, density is low, cell morphology is good, the mean diameter of abscess is low to moderate 10 μ m; And by adding modified filler, strengthen toughening composition, preparation micro-polyethylene foamed base wood-plastic composite material flexural strength high, impelling strength is large, may be used on upholstery decoration, material of construction, packed and transported, artwork market, make furniture, skirting, furred ceiling lines, floor, photo frame, picture frame, picture frame, amortizing packaging material etc., also may be used on the high-grade Material Fields such as automotive upholstery, there is the wide market space and development prospect.
Embodiment
The present invention is illustrated below in conjunction with embodiment, and described part is mass parts.Low Density Polyethylene in following embodiment is that weight-average molecular weight Mw is 40000 ~ 200000, degree of crystallinity is 20% ~ 40%, melt index (230 ℃, 2.16 KN) is LDPE pellet or the powder of 1-15 g/10min; Described high density polyethylene(HDPE) is that weight-average molecular weight Mw is 50000 ~ 300000, degree of crystallinity is 70% ~ 90%, (230 ℃, 2.16KN) be HDPE pellet or the powder of 2-10 g/10min to melt index; Wood powder, bamboo powder are all purchased from Linan City, Zhejiang jewel bamboo wood powder company limited; Powdered rice hulls is purchased from Wuxi Run Lv composite product company limited; Talcum powder and wollastonite powder are all purchased from Jiangxi Sheng Tai Chemical Co., Ltd.; Silane KH550 coupling agent is purchased from Nanjing Dao Ning Chemical Co., Ltd.; Linking agent dicumyl peroxide (DCP) is purchased from Shanghai Gaoqiao petrochemical industry fine chemistry industry company; Lubricant polyethylene wax or stearic acid or stearate are commercially available; Whipping agent Cellmic C 121 mixture is purchased from Guangzhou Hui Ke Chemical Co., Ltd.; Antioxidant be hindered phenol anti-oxidants 1010/ phosphorous acid esters antioxidant 168 compounds (B225) purchased from Switzerland's vapour Bagong department, anti UV agent UV531 is purchased from Switzerland's vapour Bagong department; Iron oxide pigment powder is purchased from Sanhuan Pigment Co., Ltd., Hunan Prov.; Interfacial compatibilizer maleic anhydride graft metallocene ethene-1-octene copolymer (MAPOE) is purchased from Nanjing De Ba Chemical Co., Ltd..
Embodiment mono-
10 parts of 15 parts of talcum powder and wollastonite powder are placed in the baking oven of 100 ℃ after dry 8 hours, put into high-speed mixer, stirring is warming up to 90 ℃, the ethanol that to adopt with volumetric concentration be 99% is with the Silane coupling agent KH550 of 1:2 dilution proportion (Silane coupling agent KH550 account for talcum powder and wollastonite powder total mass 2%) spraying, mix after 15min, cooling discharging, makes modified filler; Wood powder is placed in the baking oven of 105 ℃ to dry 10 hours.In mass ratio 2 parts of 90 parts of Low Density Polyethylenes, 10 parts of high density polyethylene(HDPE)s, modified filler, 1.5 parts of linking agents, 1 part of lubricant, 2 parts of whipping agents, 1 part of antioxidant, 1 part of anti UV agent, 1.5 parts of interfacial compatibilizers, 20 parts of wood powders, pigment are put into high-speed mixer, mix after 25 min, cooling discharging, make extruding pelletization after Preblend, prilling temperature is that 165 ℃, granulation time are 20 min, obtains wooden plastic particles; Adopt forcing machine carry out melting, blend, extrude, through foaming mould foaming, cooling and shaping, the micro-foamed polyethylene wood-plastic composite board of moulding, 175 ℃ of extruder barrel temperature, 165 ℃ of head temperatures, 160 ℃ of die temperatures.
Embodiment bis-
10 parts of 10 parts of talcum powder and wollastonite powder are placed in the baking oven of 100 ℃ after dry 8 hours, put into high-speed mixer, stirring is warming up to 90 ℃, the ethanol that to adopt with volumetric concentration be 99% is with the Silane coupling agent KH550 of 1:2 dilution proportion (Silane coupling agent KH550 account for talcum powder and wollastonite powder total mass 2%) metering spray, mix after 15min, cooling discharging, makes modified filler; Bamboo powder is placed in the baking oven of 105 ℃ to dry 10 hours.In mass ratio 2 parts of 90 parts of Low Density Polyethylenes, 10 parts of high density polyethylene(HDPE)s, modified filler, 1.5 parts of linking agents, 1.5 parts of lubricants, 1 part of antioxidant, 1 part of anti UV agent, 40 parts, bamboo powder, 3 parts of interfacial compatibilizers, pigment are put into high-speed mixer, mix after 25 min, cooling discharging, make extruding pelletization after Preblend, prilling temperature is that 165 ℃, granulation time are 20 min, obtains wooden plastic particles; Adopt forcing machine carry out melt blending, extrude, through foaming mould foaming, cooling and shaping, the micro-foamed polyethylene wood-plastic composite board of moulding, 175 ℃ of extruder barrel temperature, 165 ℃ of head temperatures, 160 ℃ of die temperatures.
Embodiment tri-
10 parts of 10 parts of talcum powder and wollastonite powder are placed in the baking oven of 100 ℃ after dry 8 hours, put into high-speed mixer, stirring is warming up to 90 ℃, the ethanol that to adopt with volumetric concentration be 99% is with the Silane coupling agent KH550 of 1:2 dilution proportion (Silane coupling agent KH550 account for talcum powder and wollastonite powder total mass 2%) metering spray, mix after 12min, cooling discharging, makes modified filler; Powdered rice hulls is placed in the baking oven of 105 ℃ to dry 10 hours.By weight 2 parts of 90 parts of Low Density Polyethylenes, 10 parts of high density polyethylene(HDPE)s, modified filler, 1 part of linking agent, 2 parts of lubricants, 1 part of antioxidant, 1 part of anti UV agent, 60 parts of powdered rice hulls, 4 parts of interfacial compatibilizers, pigment are put into high-speed mixer, mix after 30 min, cooling discharging, make extruding pelletization after Preblend, prilling temperature is that 165 ℃, granulation time are 20 min, obtains wooden plastic particles; Adopt forcing machine carry out melting, blend, extrude, through foaming mould foaming, cooling and shaping, the micro-foamed polyethylene wood-plastic composite board of moulding, 180 ℃ of extruder barrel temperature, 165 ℃ of head temperatures, 160 ℃ of die temperatures.
By the physical and mechanical property of test material, prove the effect of the embodiment of the present invention 1, embodiment 2 and embodiment 3 below, its detected result is as follows:
Micro-foamed polyethylene Wood-plastic foam matrix material in embodiment 1, embodiment 2 and embodiment 3, its density is respectively 0.81 gcm
-3, 0.86 gcm
-3with 0.91 gcm
-3, and the density of corresponding common not polyethylene foamed base wood-plastic composite material is respectively 0.96 gcm
-3, 0.99 gcm
-3with 1.04 gcm
-3, density has reduced nearly 15%; Flexural strength is respectively 16.56 MPa, 17.19 MPa and 17.54 MPa, and the flexural strength of corresponding common not polyethylene foamed base wood-plastic composite material is respectively 15.12 MPa, 15.73 MPa and 15.82 MPa, and flexural strength has improved approximately 10%; Notched Izod impact strength is respectively 16.78 KJm
-2, 13.57 KJm
-2with 12.31 KJm
-2, and the notched Izod impact strength of corresponding common not polyethylene foamed base wood-plastic composite material is respectively 14.98 KJm
-2,12.04 KJm
-2with 10.97 KJm
-2, notched Izod impact strength has improved approximately 13%.
Visible in sum, micro-polyethylene foamed base wood-plastic composite material of the present invention is compared with common not polyethylene foamed base wood-plastic composite material, has lower density, higher flexural strength and impelling strength, and the specific tenacity of material has improved 30% left and right.
Claims (10)
1. a micro-polyethylene foamed base wood-plastic composite material, is made by the component of following mass fraction: 100 parts of polyvinyl resins, 20 ~ 80 parts, vegetable fibre; 5 ~ 25 parts of talcum powder; 5 ~ 20 parts of wollastonites; 0.1 ~ 1.5 part of coupling agent; 0.5 ~ 3 part of lubricant; 0.5 ~ 3 part of whipping agent; 0.1 ~ 3 part of linking agent; 0.5 ~ 2 part of antioxidant; 0.5 ~ 2 part of anti UV agent; 1 ~ 7 part of interfacial compatibilizer; 1 ~ 3 part of pigment.
2. micro-polyethylene foamed base wood-plastic composite material according to claim 1, is characterized in that:
Described polyvinyl resin is comprised of Low Density Polyethylene and high density polyethylene(HDPE), described Low Density Polyethylene is that weight-average molecular weight Mw is 40000 ~ 200000, degree of crystallinity is 20% ~ 40%, at 230 ℃, the melt index under 2.16 KN test conditions is 90 parts of the Low Density Polyethylene pellet of 1-15 g/10min or powders; And weight-average molecular weight Mw is 50000 ~ 300000, degree of crystallinity is 70% ~ 90%, at 230 ℃, the melt index under 2.16 KN test conditions is 10 parts of the pellets of high density polyethylene of 2-10 g/10min or powders.
3. micro-polyethylene foamed base wood-plastic composite material according to claim 1 and 2, is characterized in that:
Described vegetable fibre is one or more the mixture in wood powder, bamboo powder, powdered rice hulls, and water ratio is 1% ~ 3%, and median size is 40 order ~ 120 orders.
4. micro-polyethylene foamed base wood-plastic composite material according to claim 1 and 2, is characterized in that:
Described talcum powder, its median size is 1000 order ~ 1500 orders; Described wollastonite powder is needle-like, and length-to-diameter ratio is 10:1 ~ 20:1, and median size is 1000 order ~ 1500 orders.
5. micro-polyethylene foamed base wood-plastic composite material according to claim 1 and 2, is characterized in that:
Described coupling agent is silicane or titanate ester or aluminate coupling agent; Described linking agent is dicumyl peroxide, powdery, technical grade; Described lubricant is: the mixture of one or both of polyethylene wax or stearic acid or stearate.
6. micro-polyethylene foamed base wood-plastic composite material according to claim 1 and 2, is characterized in that:
Described whipping agent is thermal equilibrium type whipping agent, and model is the Cellmic C 121 mixture of Hydrocell 232, and heat decomposition temperature is that 165-200 ℃, gas forming amount are 180 ml/g.
7. micro-polyethylene foamed base wood-plastic composite material according to claim 1 and 2, is characterized in that:
Described antioxidant is that hindered phenol anti-oxidants 1010 and phosphorous acid esters antioxidant 168 are with the composite mixture of 1:1 ratio; Described anti UV agent is Octabenzone UV531.
8. micro-polyethylene foamed base wood-plastic composite material according to claim 1 and 2, is characterized in that:
Described interfacial compatibilizer is metallocene ethene-1-octene copolymer of the polyethylene of acrylic compound class grafting or the polypropylene of acrylic compound class grafting or the grafting of acrylic compound class; Described pigment is the special-purpose organic pigment powder of inorganic pigment powder or plastics.
9. micro-polyethylene foamed base wood-plastic composite material according to claim 8, is characterized in that: described inorganic pigment powder is iron oxide pigment powder.
10. arbitrary described micro-polyethylene foamed base wood-plastic composite material of claim 1-9 and preparation method thereof, is characterized in that, its preparation process is:
1) modified talc powder and wollastonite powder: dry talcum powder and wollastonite powder are placed in high-speed mixer, stirring is warming up to 80 ~ 100 ℃, the ethanol that employing and volumetric concentration are 99% is with the coupling agent metering spray of 1:1 ~ 1:8 dilution proportion, stir after 10 ~ 30min, cooling discharging, makes modified filler;
2) modified filler Low Density Polyethylene weighing by formula, high density polyethylene(HDPE), linking agent, lubricant, whipping agent, antioxidant, anti UV agent, pigment, interfacial compatibilizer, dry vegetable fibre and step 1) being made is put into high-speed mixer; stirring is warming up to 110 ~ 120 ℃; stir after 15 ~ 50 min; cooling discharging, makes Preblend;
3) by step 2) Preblend that mixes puts into forcing machine, is a granulated into wooden plastic particles, and prilling temperature is: 145 ~ 160 ℃, granulation time are 20 ~ 40 min;
4) by the wooden plastic particles of step 3) granulation, put into twin screw extruder, extrusion foaming legal system is for micro-polyethylene foamed base wood-plastic composite material; The barrel temperature of forcing machine is that 165 ~ 185 ℃, head temperature are that 155 ~ 175 ℃, die temperature are 155 ~ 165 ℃.
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