CN102977460A - Injecting molding grade natural fiber composite material and preparation method thereof - Google Patents
Injecting molding grade natural fiber composite material and preparation method thereof Download PDFInfo
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- CN102977460A CN102977460A CN2012105356865A CN201210535686A CN102977460A CN 102977460 A CN102977460 A CN 102977460A CN 2012105356865 A CN2012105356865 A CN 2012105356865A CN 201210535686 A CN201210535686 A CN 201210535686A CN 102977460 A CN102977460 A CN 102977460A
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- natural
- composite material
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- copolymer
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- 239000000835 fiber Substances 0.000 title claims abstract description 174
- 239000002131 composite material Substances 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 238000000465 moulding Methods 0.000 title description 3
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 57
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 44
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 23
- 239000004609 Impact Modifier Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000007864 aqueous solution Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000006057 Non-nutritive feed additive Substances 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000001125 extrusion Methods 0.000 claims abstract description 6
- 239000007822 coupling agent Substances 0.000 claims abstract description 5
- -1 poly(lactic acid) Polymers 0.000 claims description 46
- 238000002347 injection Methods 0.000 claims description 40
- 239000007924 injection Substances 0.000 claims description 40
- 239000006185 dispersion Substances 0.000 claims description 25
- 229920005669 high impact polystyrene Polymers 0.000 claims description 22
- 239000004797 high-impact polystyrene Substances 0.000 claims description 22
- HVLLSGMXQDNUAL-UHFFFAOYSA-N triphenyl phosphite Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)OC1=CC=CC=C1 HVLLSGMXQDNUAL-UHFFFAOYSA-N 0.000 claims description 22
- 239000012764 mineral filler Substances 0.000 claims description 21
- 239000004743 Polypropylene Substances 0.000 claims description 18
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 17
- 229920001155 polypropylene Polymers 0.000 claims description 17
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 16
- 239000011159 matrix material Substances 0.000 claims description 16
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 15
- 239000000314 lubricant Substances 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 15
- 229910000077 silane Inorganic materials 0.000 claims description 15
- 229920001577 copolymer Polymers 0.000 claims description 12
- 239000004698 Polyethylene Substances 0.000 claims description 11
- 229920001971 elastomer Polymers 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- 239000005060 rubber Substances 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 229920000181 Ethylene propylene rubber Polymers 0.000 claims description 10
- 229920000573 polyethylene Polymers 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 229940089401 xylon Drugs 0.000 claims description 10
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 9
- 229920006226 ethylene-acrylic acid Polymers 0.000 claims description 9
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 claims description 8
- DJOWTWWHMWQATC-KYHIUUMWSA-N Karpoxanthin Natural products CC(=C/C=C/C=C(C)/C=C/C=C(C)/C=C/C1(O)C(C)(C)CC(O)CC1(C)O)C=CC=C(/C)C=CC2=C(C)CC(O)CC2(C)C DJOWTWWHMWQATC-KYHIUUMWSA-N 0.000 claims description 8
- 229920000147 Styrene maleic anhydride Polymers 0.000 claims description 8
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 8
- 150000002148 esters Chemical class 0.000 claims description 8
- 239000000194 fatty acid Substances 0.000 claims description 8
- 229930195729 fatty acid Natural products 0.000 claims description 8
- 150000004665 fatty acids Chemical class 0.000 claims description 8
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims description 8
- 235000019260 propionic acid Nutrition 0.000 claims description 8
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 8
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 8
- 229920000742 Cotton Polymers 0.000 claims description 7
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 7
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 7
- 238000005469 granulation Methods 0.000 claims description 7
- 230000003179 granulation Effects 0.000 claims description 7
- FEEPBTVZSYQUDP-UHFFFAOYSA-N heptatriacontanediamide Chemical compound NC(=O)CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC(N)=O FEEPBTVZSYQUDP-UHFFFAOYSA-N 0.000 claims description 7
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 239000000344 soap Substances 0.000 claims description 7
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 6
- 230000004048 modification Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 5
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 5
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 5
- 239000011425 bamboo Substances 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 229920001897 terpolymer Polymers 0.000 claims description 5
- 239000004925 Acrylic resin Substances 0.000 claims description 4
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 4
- 239000008116 calcium stearate Substances 0.000 claims description 4
- 235000013539 calcium stearate Nutrition 0.000 claims description 4
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000004005 microsphere Substances 0.000 claims description 4
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 claims description 4
- 239000012188 paraffin wax Substances 0.000 claims description 4
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 4
- 229920000098 polyolefin Polymers 0.000 claims description 4
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 4
- 239000004800 polyvinyl chloride Substances 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 3
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 239000004793 Polystyrene Substances 0.000 claims description 3
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims description 3
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 3
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 3
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 229920000178 Acrylic resin Polymers 0.000 claims description 2
- 229920003193 cis-1,4-polybutadiene polymer Polymers 0.000 claims description 2
- 229920006124 polyolefin elastomer Polymers 0.000 claims description 2
- 244000082204 Phyllostachys viridis Species 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 14
- 238000001746 injection moulding Methods 0.000 abstract description 5
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 239000011256 inorganic filler Substances 0.000 abstract 1
- 229910003475 inorganic filler Inorganic materials 0.000 abstract 1
- 239000011780 sodium chloride Substances 0.000 abstract 1
- 238000011160 research Methods 0.000 description 5
- 241001330002 Bambuseae Species 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 240000006240 Linum usitatissimum Species 0.000 description 2
- 235000004431 Linum usitatissimum Nutrition 0.000 description 2
- 229920002522 Wood fibre Polymers 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- IXSZQYVWNJNRAL-UHFFFAOYSA-N etoxazole Chemical compound CCOC1=CC(C(C)(C)C)=CC=C1C1N=C(C=2C(=CC=CC=2F)F)OC1 IXSZQYVWNJNRAL-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 244000198134 Agave sisalana Species 0.000 description 1
- 229920001342 Bakelite® Polymers 0.000 description 1
- 241001474374 Blennius Species 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000011246 composite particle Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011094 fiberboard Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 239000003444 phase transfer catalyst Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920013657 polymer matrix composite Polymers 0.000 description 1
- 239000011160 polymer matrix composite Substances 0.000 description 1
- 238000005464 sample preparation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- AYEKOFBPNLCAJY-UHFFFAOYSA-O thiamine pyrophosphate Chemical compound CC1=C(CCOP(O)(=O)OP(O)(O)=O)SC=[N+]1CC1=CN=C(C)N=C1N AYEKOFBPNLCAJY-UHFFFAOYSA-O 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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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
- B29C48/03—Extrusion 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
- B29C48/04—Particle-shaped
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
-
- 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
- B29C2948/92704—Temperature
-
- 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
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
-
- 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
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
Abstract
The invention relates to a natural fiber composite material and a preparation method of the composite material. The composite material comprises the following components in parts by weight: 100 parts of thermoplastic resin, 5-50 parts of natural fiber, 0-20 parts of impact modifier, 0-30 parts of inorganic filler, 0.1-5 parts of anti-aging agent, and 0-10 parts of processing aid. The preparation method of the composite material comprises the steps of adding the natural fiber into an aqueous solution of a saline coupling agent to soak, then drying the natural fiber, mixing the natural fiber with the other processing aids, feeding the mixed material into a double-screw extruder to subject to the melting extrusion, and granulating to obtain the composite material. Compared with the prior art, the preparation method is simple in process and environment-friendly. More importantly, the problems that the composite material, into which a large amount of natural fiber is added, is poor in material mobility, low in intensity of parts, and poor in appearance quality, are solved. The current situation that the natural fiber composite material cannot adapt to the injection moldings of complex structures is changed.
Description
Technical field
The present invention relates to a kind of natural-fiber composite material and preparation method thereof.
Background technology
Natural fiber is the main load component of matrix material, and it can not only improve the strength and modulus of material, and can reduce contraction, improves heat-drawn wire and shock strength etc.Natural fiber is compared with synthon, has the advantages such as price is low, density is little, easy degraded.Along with the enhancing of people's environmental consciousness, natural fiber more and more is subject to people's attention as a kind of " green material ", and range of application constantly enlarges, and it is very rapid to strengthen the body tempo as polymer matrix composites.Especially the application of natural-fiber composite material in automobile driving the growth in market.Existing several trolley parts use the natural-fiber composite material manufacturing now, and their normal operation polyester or polypropylene are matrix resin, use flax, hemp, mestha or sisal fibers to be strongthener.
In recent years, research has become focus, the structure of various natural-fiber composite materials and performance study to be tending towards ripe about natural-fiber composite material.Such as Wang Liduo, University Of Science and Technology Of Tianjin, Master's thesis " research of polypropylene/flax fiber composite structure and performance " in 2009; Zhao Lisha, Agricultural University Of Jiangxi, 2011 " research of biological fiber composite materials property and matrix material evaluation of life cycle "; Deng Hua, Ji'nan University, Master's thesis " the microwave modification stalk fibre prepares the research of composite polyolefine material " in 2010; Luan Li wakes up, East China University of Science, Ph D dissertation " the preparation and property research of polypropylene/natural seaweed fibre composite " etc. in 2011.Chinese patent application number: 201010126234.2 also disclose a kind of natural-fiber composite material and preparation method thereof, and this natural-fiber composite material is by the component preparation that mainly comprises following weight part proportioning: 100～200 parts in 14～135 parts of water-base resins, 100～500 parts in natural fiber, 0.3～5 part of stiffening agent, 0.01～5 part of phase-transfer catalyst, 50～500 parts in weighting material and water.This invention only uses a small amount of macromolecule resin natural fiber can be coated fully, obtains the splendid natural-fiber composite material of water resistance; Modified natural fiber can be used for the water-repellancy fiberboard, bakelite filler and mould the raw material of the multiple material of wood.But about the injection grade natural-fiber composite material is rare report arranged.What can retrieve is Chinese patent application number than pertinent literature: the material of 200680021214.0 moulding to be injected, its method and uses thereof, this patent relate to a kind for the treatment of by the suitable matrix material of injection moulding process preparation and the injection moulding process of matrix material.According to this inventive method, matrix material is by carrying out the following steps preparation: (I) make natural fiber length even; (II) surface of natural fiber and lignocellulose residue (if existence) is processed; (III) component of pre-mixing matrix material; (IV) matrix material is extruded also granulation; (V) matrix material injection molding is come structural member.
At present existing natural-fiber composite material preparation technology is mainly take extrusion moulding, hot-forming and extruding shaping technique as main, mainly for the production of the sheet material based article, Injection moulded part for the molding structure complexity is subject to very large restriction, subject matter is owing to the mobile property of the matrix material that adds a large amount of natural fibers is poor, product intensity is low, and visual appearance is poor.Therefore existing natural-fiber composite material and be not suitable for making injection-molded item.
Summary of the invention
The objective of the invention is, poor for solving the mobile property of the matrix material that adds a large amount of natural fibers, product intensity is low, and the problem that visual appearance is poor changes the present situation that natural-fiber composite material is not suitable with baroque Injection moulded part.The invention provides a kind of injection grade natural-fiber composite material and preparation method thereof, present method flow process is simple, continuous, high, the constant product quality of production efficiency.
The present invention can realize by following concrete mode:
A kind of injection grade natural-fiber composite material, it is prepared by the component that mainly comprises following weight part proportioning: 100 parts of thermoplastic resins, 5～50 parts in natural fiber, 0～20 part of impact modifier, 0～30 part of mineral filler, 0.1～5 part of antiaging agent, 0～10 part of processing aid, wherein:
Described thermoplastic resin is poly(lactic acid), polypropylene, polyethylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene copolymer, the modified by maleic acid anhydride graft polypropylene, maleic anhydride modified polyolefine, the ethylene-acrylic acid resin copolymer, ethylene-acrylic acid copolymer, the ethylene-acrylic acid salt copolymer, ethylene-vinyl acetate copolymer, High Impact Polystyrene (HIPS), styrene-maleic anhydride copolymer, the modification High Impact Polystyrene (HIPS) acrylonitritrile-styrene resin of maleic anhydride graft, styrene-maleic anhydride copolymer, the high-impact polystyrene of modified by maleic acid anhydride graft, at least a in the acrylonitrile-butadiene styrol copolymer of modified by maleic acid anhydride graft;
Described natural fiber is at least a of flaxen fiber, cotton fibre, xylon, bamboo fibers, coir, stalk fibre, rice hull cellulose;
Described impact modifier is at least a of styrene-butadiene-styrene block copolymer, ethylene-propylene rubber(EPR), itrile group-divinyl rubber, terpolymer EP rubber, cis-1,4-polybutadiene rubber, acrylic resin, polyolefin elastomer, ethylene-acrylic acid copolymer, ethylene-acrylic acid salt copolymer, ethylene-vinyl acetate copolymer;
Described mineral filler is at least a of calcium carbonate, polynite, talcum powder, glass fibre, glass microsphere;
Described antiaging agent be triphenyl phosphite, [3-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid season the eleventh of the twelve Earthly Branches tetrol ester and (2,4-di-tert-butyl-phenyl) phosphorous acid ester at least a.
Described processing aid is lubricant or dispersion agent.Preferably, described lubricant is selected from least a of soap and fatty acid amide.Preferably, described dispersion agent is selected from paraffin, low molecular weight polyethylene, calcium stearate, Zinic stearas, stearic amide, methylene bis stearic amide and N, at least a in the N'-ethylene bis stearamide.
Described natural fiber is through the natural fiber of coupling agent treatment.Preferably, described coupling agent is silane coupling agent.
Preferably, described natural fiber length or particle diameter are all less than 3mm.
The preparation method of described a kind of injection grade natural-fiber composite material may further comprise the steps:
(1) natural fiber being added silane coupled agent concentration is 1 ~ 10% aqueous solution soaking 4 ~ 8 hours, the silane coupler solution consumption is that complete submergence natural fiber and liquid level are no more than 2cm from natural fiber, natural fiber is filtered out, and put under 105 ℃ of conditions of loft drier and dry, or directly will to have added silane coupled agent concentration be that natural fiber that it's 4 ~ 8 hours is past 1 ~ 10% aqueous solution soaking is put under 105 ℃ of conditions of loft drier and dried, and the natural fiber after obtaining to process is for subsequent use;
(2) will place high-speed mixer by natural fiber and other processing aid after the load weighted thermoplastic resin of proportioning, the processing, be 500～2000rpm at rotating speed, mixed under the normal temperature 30～1000 seconds;
(3) raw material that mixes is added in the twin screw extruder, in the high speed shear of screw rod, mixing and carry lower, through melt extruding, obtaining matrix material after the granulation; The temperature in described twin screw extruder each district from the opening for feed to the die head is 100～220 ℃; Screw speed 50 ~ the 250rpm of described twin screw extruder.
Preferably, the raw material that mixes in the step (3) is added by the charging of twin-screw extrusion pusher side.
Positively effect of the present invention is, the present invention compared with prior art utilizes these inexpensive renewable resource of natural fiber, and technique is simple, and has biodegradable, is conducive to environmental protection, belongs to environment-friendly material; Can also increase the added value of natural fibre product, have Important Economic and be worth; Be used for automobile product by Shooting Technique, can further realize the complicated part injection moulding manufacturing in the automotive industry for example, reduce cost; The density of natural fiber is low than regenerated fiber, and the composite density of preparing is also low, can realize lightweight.It is poor to the invention solves the mobile property of the matrix material that adds a large amount of natural fibers, and product intensity is low, the problem that visual appearance is poor.Change the present situation that natural-fiber composite material is not suitable with baroque Injection moulded part.
Embodiment
Embodiment 1, a kind of injection grade natural-fiber composite material
A kind of injection grade natural-fiber composite material comprises the component preparation of following weight part proportioning:
Polypropylene (thermoplastic resin) 10kg;
Mean length or particle diameter are all less than xylon (natural fiber) 500g of 3mm;
Triphenyl phosphite (antiaging agent) 10g.
Described natural fiber is processed through silane coupling agent.
Embodiment 2, a kind of injection grade natural-fiber composite material
A kind of injection grade natural-fiber composite material comprises the component preparation of following weight part proportioning:
Polypropylene (thermoplastic resin) 10kg;
Mean length or particle diameter are all less than xylon (natural fiber) 5kg of 3mm;
Triphenyl phosphite (antiaging agent) 500g.
Described natural fiber is processed through silane coupling agent.
Embodiment 3, a kind of injection grade natural-fiber composite material
A kind of injection grade natural-fiber composite material; Comprise the component preparation of following weight part proportioning:
Polypropylene (thermoplastic resin) 10kg;
Mean length or particle diameter are all less than xylon (natural fiber) 2.5kg of 3mm;
Triphenyl phosphite (antiaging agent) 250g.
Described natural fiber is processed through silane coupling agent.
Embodiment 4, a kind of injection grade natural-fiber composite material
A kind of injection grade natural-fiber composite material comprises the component preparation of following weight part proportioning:
Polyethylene (thermoplastic resin) 10kg;
Mean length or particle diameter are all less than bamboo fibers (natural fiber) 5kg of 3mm;
Ethylene-propylene rubber(EPR) (impact modifier) 2kg;
Calcium carbonate (mineral filler) 3kg;
Triphenyl phosphite (antiaging agent) 500g;
Fatty acid amide (lubricant) 500g;
N, N'-ethylene bis stearamide (dispersion agent) 500g.
Embodiment 5, a kind of injection grade natural-fiber composite material
A kind of injection grade natural-fiber composite material comprises the component preparation of following weight part proportioning:
Poly(lactic acid) 1kg(thermoplastic resin), polyvinyl chloride 4.5kg(thermoplastic resin), polyethylene 4.5kg(thermoplastic resin);
Mean length or particle diameter be all less than flaxen fiber (natural fiber) 1kg of 3mm, cotton fibre (natural fiber) 1kg, xylon (natural fiber) 1kg, bamboo fibers (natural fiber) 1kg, coir (natural fiber) 1kg;
Styrene-butadiene-styrene block copolymer (impact modifier) 500g, itrile group-divinyl rubber (impact modifier) 500g, terpolymer EP rubber (impact modifier) 500g, ethylene-propylene rubber(EPR) (impact modifier) 500g;
Polynite (mineral filler) 500g, talcum powder (mineral filler) 500g, glass fibre (mineral filler) 500g, glass microsphere (mineral filler) 500g, calcium carbonate (mineral filler) 50g;
[3-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid ］ season the eleventh of the twelve Earthly Branches tetrol ester (antiaging agent) 100g, (2,4-di-tert-butyl-phenyl) phosphorous acid ester (antiaging agent) 200g, triphenyl phosphite (antiaging agent) 200g;
Soap 25g(lubricant), fatty acid amide (lubricant) 250g;
Paraffin 50g(dispersion agent), low molecular weight polyethylene 50g(dispersion agent), calcium stearate 50g(dispersion agent), Zinic stearas 50g(dispersion agent), stearic amide 50g(dispersion agent), methylene bis stearic amide 100g(dispersion agent), N, N'-ethylene bis stearamide (dispersion agent) 150g.
Described natural fiber is processed through silane coupling agent.
Embodiment 6, a kind of injection grade natural-fiber composite material
A kind of injection grade natural-fiber composite material comprises the component preparation of following weight part proportioning:
Polypropylene 1kg(thermoplastic resin), polystyrene 1kg(thermoplastic resin), acrylonitrile-butadiene-styrene copolymer 1kg(thermoplastic resin), modified by maleic acid anhydride graft polypropylene 1kg(thermoplastic resin), maleic anhydride modified polyolefine 1kg(thermoplastic resin), ethylene-acrylic acid salt copolymer 1.25kg(thermoplastic resin), ethylene-vinyl acetate copolymer 1.25kg(thermoplastic resin), High Impact Polystyrene (HIPS) 1.25kg(thermoplastic resin), the acrylonitrile-butadiene styrol copolymer 1.25kg(thermoplastic resin of modified by maleic acid anhydride graft);
Mean length or particle diameter be all less than flaxen fiber (natural fiber) 500g of 3mm, cotton fibre (natural fiber) 500g, xylon (natural fiber) 2kg;
Styrene-butadiene-styrene block copolymer (impact modifier) 1kg;
Polynite (mineral filler) 750g, talcum powder (mineral filler) 750g;
[3-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid ］ season the eleventh of the twelve Earthly Branches tetrol ester (antiaging agent) 100g, (2,4-di-tert-butyl-phenyl) phosphorous acid ester (antiaging agent) 200g;
Soap 130g(lubricant), fatty acid amide (lubricant) 220g; Methylene bis stearic amide 100g(dispersion agent), N, N'-ethylene bis stearamide (dispersion agent) 150g.
Described natural fiber is processed through silane coupling agent.
Embodiment 7, a kind of injection grade natural-fiber composite material
A kind of injection grade natural-fiber composite material comprises the component preparation of following weight part proportioning:
Described thermoplastic resin is ethylene-acrylic acid salt copolymer 2kg(thermoplastic resin), ethylene-vinyl acetate copolymer 1kg(thermoplastic resin), High Impact Polystyrene (HIPS) 1kg(thermoplastic resin), styrene-maleic anhydride copolymer 1kg(thermoplastic resin), the modification High Impact Polystyrene (HIPS) acrylonitritrile-styrene resin 1kg(thermoplastic resin of maleic anhydride graft), styrene-maleic anhydride copolymer 1kg(thermoplastic resin), the high-impact polystyrene 3kg(thermoplastic resin of modified by maleic acid anhydride graft);
Mean length or particle diameter be all less than flaxen fiber (natural fiber) 750g of 3mm, cotton fibre (natural fiber) 750g;
Styrene-butadiene-styrene block copolymer (impact modifier) 1.25kg;
Polynite (mineral filler) 750g, talcum powder (mineral filler) 750g;
[3-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid ］ season the eleventh of the twelve Earthly Branches tetrol ester (antiaging agent) 100g, (2,4-di-tert-butyl-phenyl) phosphorous acid ester (antiaging agent) 200g;
Soap 20g(lubricant), fatty acid amide (lubricant) 200g; Methylene bis stearic amide 100g(dispersion agent), N, N'-ethylene bis stearamide (dispersion agent) 150g.
Described natural fiber is processed through silane coupling agent.
The preparation method of embodiment 8, a kind of injection grade natural-fiber composite material
A kind of preparation method of injection grade natural-fiber composite material may further comprise the steps:
(1) with mean length or particle diameter all less than xylon (natural fiber) 500g of 3mm; Added silane coupled agent concentration and be 1% aqueous solution soaking 4 hours, the silane coupler solution consumption is submergence natural fiber just, natural fiber is filtered out, and put under 105 ℃ of conditions of loft drier and dry, and the natural fiber after obtaining to process is for subsequent use.
(2) with polypropylene (thermoplastic resin) 10kg; Triphenyl phosphite (antiaging agent) 10g; Natural fiber after the processing is 500rpm at rotating speed, mixes 30 seconds under the normal temperature.
(3) temperature in twin screw extruder each district from the opening for feed to the die head is 100 ℃; The screw speed 50rpm of described twin screw extruder.The raw material that mixes is added in the twin screw extruder, in the high speed shear of screw rod, mixing and carry lower, through melt extruding, obtaining the polypropylene wood fibre composite after the granulation.
The preparation method of embodiment 9, a kind of injection grade natural-fiber composite material
A kind of preparation method of injection grade natural-fiber composite material may further comprise the steps:
(1) with mean length or particle diameter all less than xylon (natural fiber) 5kg of 3mm; Added silane coupled agent concentration and be 1 aqueous solution soaking 8 hours, the silane coupler solution consumption is that complete submergence natural fiber and liquid level are from natural fiber 1cm, natural fiber is filtered out, and put under 105 ℃ of conditions of loft drier and dry, the natural fiber after obtaining to process is for subsequent use.
(2) with polypropylene (thermoplastic resin) 10kg; Triphenyl phosphite (antiaging agent) 500g; Natural fiber after the processing is 2000rpm at rotating speed, mixes 100 seconds under the normal temperature.
(3) temperature in twin screw extruder each district from the opening for feed to the die head is 220 ℃; The screw speed 250rpm of described twin screw extruder.The raw material that mixes is added in the twin screw extruder, in the high speed shear of screw rod, mixing and carry lower, through melt extruding, obtaining the polypropylene wood fibre composite after the granulation.
The preparation method of embodiment 10, a kind of injection grade natural-fiber composite material
A kind of preparation method of injection grade natural-fiber composite material may further comprise the steps:
(1) with mean length or particle diameter all less than stalk fibre (natural fiber) 1kg of 3mm, cotton fibre (natural fiber) 1kg, xylon (natural fiber) 1kg, bamboo fibers (natural fiber) 1kg, coir (natural fiber) 1kg; Added silane coupled agent concentration and be 5% aqueous solution soaking 6 hours, the silane coupler solution consumption is that complete submergence natural fiber and liquid level are from natural fiber height 2cm, directly will add silane coupled agent concentration and be natural fiber that it's 4 ~ 8 hours pasts 1 ~ 10% aqueous solution soaking and put under 105 ℃ of conditions of loft drier and dry, the natural fiber after obtaining to process is for subsequent use;
(2) will be by the load weighted poly(lactic acid) 1kg(thermoplastic resin of proportioning), polyvinyl chloride 4,5kg(thermoplastic resin), polyethylene 4.5kg(thermoplastic resin);
Styrene-butadiene-styrene block copolymer (impact modifier) 500g, itrile group-divinyl rubber (impact modifier) 500g, terpolymer EP rubber (impact modifier) 500g, ethylene-propylene rubber(EPR) (impact modifier) 500g;
Polynite (mineral filler) 500g, talcum powder (mineral filler) 500g, glass fibre (mineral filler) 500g, glass microsphere (mineral filler) 500g, calcium carbonate (mineral filler) 500g;
[3-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid ］ season the eleventh of the twelve Earthly Branches tetrol ester (antiaging agent) 100g, (2,4-di-tert-butyl-phenyl) phosphorous acid ester (antiaging agent) 200g, triphenyl phosphite (antiaging agent) 200g;
Soap 250g(lubricant), fatty acid amide (lubricant) 250g;
Paraffin 50g(dispersion agent), low molecular weight polyethylene 50g(dispersion agent), calcium stearate 50g(dispersion agent), Zinic stearas 50g(dispersion agent), stearic amide 50g(dispersion agent), methylene bis stearic amide 100g(dispersion agent), N, N'-ethylene bis stearamide (dispersion agent) 150g;
And the natural fiber after processing places high-speed mixer, is 1500rpm at rotating speed, mixes 600 seconds under the normal temperature;
(3) raw material that mixes is added by the charging of twin-screw extrusion pusher side.The temperature in twin screw extruder each district from the opening for feed to the die head is 180 ℃; The screw speed 180rpm of described twin screw extruder.Raw material adds in the twin screw extruder, in the high speed shear of screw rod, mixing and carry lower, through melt extruding, obtaining matrix material after the granulation.
The preparation method of embodiment 10, a kind of injection grade natural-fiber composite material
A kind of preparation method of injection grade natural-fiber composite material may further comprise the steps:
(1) with mean length or particle diameter all less than flaxen fiber (natural fiber) 750g of 3mm, cotton fibre (natural fiber) 750g; Added silane coupled agent concentration and be 10% aqueous solution soaking 8 hours, the silane coupler solution consumption is complete submergence natural fiber just, after the filtration natural fiber is put under 105 ℃ of conditions of loft drier and dries, and the natural fiber after obtaining to process is for subsequent use.
(2) will be ethylene-acrylic acid salt copolymer 2kg(thermoplastic resin by the load weighted described thermoplastic resin of proportioning), ethylene-vinyl acetate copolymer 1kg(thermoplastic resin), High Impact Polystyrene (HIPS) 1kg(thermoplastic resin), styrene-maleic anhydride copolymer 1kg(thermoplastic resin), the modification High Impact Polystyrene (HIPS) acrylonitritrile-styrene resin 1kg(thermoplastic resin of maleic anhydride graft), styrene-maleic anhydride copolymer 1kg(thermoplastic resin), the high-impact polystyrene 3kg(thermoplastic resin of modified by maleic acid anhydride graft);
Styrene-butadiene-styrene block copolymer (impact modifier) 1.25kg;
Polynite (mineral filler) 750g, talcum powder (mineral filler) 750g;
[3-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid ］ season the eleventh of the twelve Earthly Branches tetrol ester (antiaging agent) 100g, (2,4-di-tert-butyl-phenyl) phosphorous acid ester (antiaging agent) 200g;
Soap 200g(lubricant), fatty acid amide (lubricant) 200g; Methylene bis stearic amide 100g(dispersion agent), N, N'-ethylene bis stearamide (dispersion agent) 150g.
And the natural fiber after processing places high-speed mixer, is 1500rpm at rotating speed, mixes 600 seconds under the normal temperature;
(3) raw material that mixes is added by the charging of twin-screw extrusion pusher side.The temperature in twin screw extruder each district from the opening for feed to the die head is 160 ℃; The screw speed 75rpm of described twin screw extruder.Raw material adds in the twin screw extruder, in the high speed shear of screw rod, mixing and carry lower, through melt extruding, obtaining matrix material after the granulation.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Embodiment 11, the test of natural-fiber composite material preparation and property
The test item that relates in the present embodiment and examination criteria are from " non-metallic material and component performance safety authenticate ruler thereof " (CQC13-036047-2009).Sample preparation methods is as follows:
(1) natural fiber (rice hull cellulose, flaxen fiber) is added contains 4% silane coupling agent aqueous solution soaking after 4 hours, natural fiber is filtered out, and put under 105 ℃ of conditions of loft drier and dry.Constant temperature is 2 hours after the oven dry.
(2) difference accurately claims the amount such as material proportion in the table 1.
(3) each material with above weighing adds in the high-speed mixer, low speed mixing 3 minutes, and high-speed mixing is 2 minutes again, and the material actual temperature is elevated to 38 ℃ by 30 ℃, obtains the compound of homogeneous.
(4) this compound is carried out extruding pelletization at dual-screw pelletizer, opening for feed is 170 ~ 180 ℃ to the actual temperature in each district of die head, 184 ℃ of molten temperature, and screw speed is 85rpm.
(5) composite particles is injection molded into the standard testing batten, stretches, the performance test such as bending, impact, density, such as table 2.
(6) particle was dried 2 hours under 105 ℃, present embodiment is injection molded into automobile product with prepared natural-fiber composite material, the door shield parts again.Shooting Technique is consistent with conventional P P material technology, and the melting index of the particle of surveying (200 ℃, 5kg) be respectively 11g/10min, 8g/10min, 3g/10min, better mobile.
Table 1 natural-fiber composite material preparation table
Annotate: PP: polypropylene; EPDM: terpolymer EP rubber; 1010:[3-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid ］ season the eleventh of the twelve Earthly Branches tetrol ester; TPP: triphenyl phosphite; PE wax: polyethylene wax; EBS: vinyl bis-stearamides
Table 2 natural-fiber composite material the performance test results
Claims (8)
1. injection grade natural-fiber composite material, it is prepared by the component that mainly comprises following weight part proportioning: 100 parts of thermoplastic resins, 5～50 parts in natural fiber, 0～20 part of impact modifier, 0～30 part of mineral filler, 0.1～5 part of antiaging agent, 0～10 part of processing aid, wherein:
Described thermoplastic resin is poly(lactic acid), polypropylene, polyethylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene copolymer, the modified by maleic acid anhydride graft polypropylene, maleic anhydride modified polyolefine, the ethylene-acrylic acid resin copolymer, ethylene-acrylic acid copolymer, the ethylene-acrylic acid salt copolymer, ethylene-vinyl acetate copolymer, High Impact Polystyrene (HIPS), styrene-maleic anhydride copolymer, the modification High Impact Polystyrene (HIPS) acrylonitritrile-styrene resin of maleic anhydride graft, styrene-maleic anhydride copolymer, the high-impact polystyrene of modified by maleic acid anhydride graft, at least a in the acrylonitrile-butadiene styrol copolymer of modified by maleic acid anhydride graft;
Described natural fiber is at least a of flaxen fiber, cotton fibre, xylon, bamboo fibers, coir, stalk fibre, rice hull cellulose;
Described impact modifier is at least a of styrene-butadiene-styrene block copolymer, ethylene-propylene rubber(EPR), itrile group-divinyl rubber, terpolymer EP rubber, cis-1,4-polybutadiene rubber, acrylic resin, polyolefin elastomer, ethylene-acrylic acid copolymer, ethylene-acrylic acid salt copolymer, ethylene-vinyl acetate copolymer;
Described mineral filler is at least a of calcium carbonate, polynite, talcum powder, glass fibre, glass microsphere;
Described antiaging agent be triphenyl phosphite, [3-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid season the eleventh of the twelve Earthly Branches tetrol ester and (2,4-di-tert-butyl-phenyl) phosphorous acid ester at least a.
Described processing aid is lubricant or dispersion agent.
2. injection grade natural-fiber composite material as claimed in claim 1, wherein, described lubricant is selected from least a of soap and fatty acid amide.
3. injection grade natural-fiber composite material as claimed in claim 1, wherein, described dispersion agent is selected from paraffin, low molecular weight polyethylene, calcium stearate, Zinic stearas, stearic amide, methylene bis stearic amide and N, at least a in the N'-ethylene bis stearamide.
4. injection grade natural-fiber composite material as claimed in claim 1, wherein, described natural fiber is through the natural fiber of coupling agent treatment.
5. injection grade natural-fiber composite material as claimed in claim 4, wherein, described coupling agent is silane coupling agent.
6. injection grade natural-fiber composite material as claimed in claim 1, wherein, described natural fiber length or particle diameter are all less than 3mm.
7. the preparation method of injection grade natural-fiber composite material as claimed in claim 1 may further comprise the steps:
(1) natural fiber being added silane coupled agent concentration is 1 ~ 10% aqueous solution soaking 4 ~ 8 hours, the silane coupler solution consumption is that complete submergence natural fiber and liquid level are no more than 2cm from natural fiber, natural fiber is filtered out, and put under 105 ℃ of conditions of loft drier and dry, or directly will to have added silane coupled agent concentration be that natural fiber that it's 4 ~ 8 hours is past 1 ~ 10% aqueous solution soaking is put under 105 ℃ of conditions of loft drier and dried, and the natural fiber after obtaining to process is for subsequent use;
(2) will place high-speed mixer by natural fiber and other processing aid after the load weighted thermoplastic resin of proportioning, the processing, be 500～2000rpm at rotating speed, mixed under the normal temperature 30～1000 seconds;
(3) raw material that mixes is added in the twin screw extruder, in the high speed shear of screw rod, mixing and carry lower, through melt extruding, obtaining matrix material after the granulation; The temperature in described twin screw extruder each district from the opening for feed to the die head is 100～220 ℃; Screw speed 50 ~ the 250rpm of described twin screw extruder.
8. injection grade natural-fiber composite material preparation method as claimed in claim 7, wherein, the raw material that mixes in the described step (3) adds by the charging of twin-screw extrusion pusher side.
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