CN102952337A - Modified bamboo fiber reinforced polypropylene composite material and preparation method thereof - Google Patents
Modified bamboo fiber reinforced polypropylene composite material and preparation method thereof Download PDFInfo
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- CN102952337A CN102952337A CN2012104581832A CN201210458183A CN102952337A CN 102952337 A CN102952337 A CN 102952337A CN 2012104581832 A CN2012104581832 A CN 2012104581832A CN 201210458183 A CN201210458183 A CN 201210458183A CN 102952337 A CN102952337 A CN 102952337A
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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
- B29C48/25—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
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/625—Screws characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio]
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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
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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
- B29C48/25—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
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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
- B29C48/25—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
- B29C2948/92704—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
- B29C2948/92895—Barrel or housing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
The invention discloses a modified bamboo fiber reinforced polypropylene composite material which comprises polypropylene resin, bamboo fibers, compatilizer, coupling agent, chemical modifier and the like; first, prepared natural fibers are modified and then the fibers are mixed with other components; and the mixture is extruded and formed by a double-screw extruder. According to the preparation method, the production procedures are simple and the production efficiency is improved; and the prepared modified bamboo fibers have more excellent performance, and have the advantages of environmental friendliness, sound absorption, heat insulation, low density, low shrinkage, good processing and forming performance, degradability and excellent integrated mechanical properties.
Description
Technical field
The invention belongs to new material technology field, be specifically related to a kind of natural bamboo fibres composite modified and with reinforced polypropylene compound material and preparation method thereof.
Technical background
In recent years, people's environmental protection consciousness constantly strengthens, and wherein processing characteristics plastics pollution on the environment good, that be used to various mechanicalss has become the problem of generally being concerned about.Particularly fibre reinforced composites are normally combined with plastics by glass fibre, carbon fiber etc., and the processing of waste is difficult, production environment is abominable, has increased very large burden to environment.Therefore, natural fiber has caused people's concern as strongthener for the friendly type matrix material of production environment.Utilize vegetable fibre and synthetic resins to carry out compound research and have long history, in recent years, begin development abroad and develop high performance natural plant fibre matrix material, adopt jute such as German BASF AG, sisal hemp and flax fiber are as the compound natural fiber reinforced thermoplastics(RTP) felt composite material (NMTS) of preparing of the thermoplasticss such as strongthener and polypropylene, its weight range can change from 500-1800g/m2, than GMTS(fibreglass reinforced thermoplastic) light by 17%, and do not lose its flexibility, working method is fairly simple, production cost is lower, has very large economic benefit.Adopt at present vegetable fibre to strengthen the PP material and make panel board assembly shell and become main flow, a kind of smell is little, it is aging to be difficult for, low density and have the vegetable fibre of better environmental compatibility to strengthen the PP material, is applied in above the car.The trolley part that the polypropylene that strengthens such as 45% xylon that occurs on the German market is made, the products such as damping calendared sheet that strengthen with xylon.The state such as India, Japan adopts jute, sisal hemp, flax fiber and hemp fibre to make the natural plant fibre polymer composite product as strongthener and thermoplastic polymer also to have begun the engineering application.The natural fiber reinforced composite is at the early-stage at home, and only limiting to document and patent has some reports, and the research of China in this field still is in the real also not appearance of product that realizes volume production of starting stage.
China's bamboo wood output ranks first in the world, and reserves reach 1.27 hundred million tons, and cheap, major part is distributed in the mountain areas such as Hunan, Anhui, Zhejiang, bamboo fibers is used for the high value added products such as exploitation matrix material, can drives the Economic development of poverty-stricken area, have higher social value.Bamboo fiber has good biodegradable and recyclability simultaneously, utilize the compound materials of developing of thermoplastic resin such as this fiber and low-melting point polyester and polypropylene, its intensity, specific modulus are relatively high, the enhancing body of the matrix material that the general industry of suitable for making is used; Simultaneously can wild phase be separated with matrix phase by melt process, effectively reach the purpose of recycling, thereby embody the feature of environmental protection and sustainable developability that material is used.
At present China's bamboo processing product mainly contains bamboo lamination material, bamboo wood, bamboo plywood etc., and by the daily necessities of bamboo processing etc.In these product processing, the bamboo material utilization ratio is low, and a large amount of residue scrap stock that produce often act as a fuel and burn, and this is from the environmental protection aspect or utilization of resources aspect all is irrational.Therefore, utilize the scrap stock that produce in the bamboo processing process as filler or strengthen body that to be combined into substitute materials for wood with thermoplastics be the important channel that bamboo wood fully utilizes.Bamboo fiber reinforcement thermoplastic plastic composite material processing power consumption is few, and the processing units loss is little, is conducive to save energy.Its most outstanding advantage is degradable and has reproducibility, is conducive to environment protection.The bamboo fiber reinforcement thermoplastic plastic composite material has broad application prospects in fields such as automobile, electromechanics, upholsterys, is a kind of important composite material that is developing.
Patent application 02133494.3 discloses the preparation method of natural bamboo fibres, discloses the process that how prepares bamboo fibers from former bamboo through various pre-treatments, does not relate to the modification of bamboo fibers and prepares the method for matrix material.Patent application 200710190739.3 discloses a kind of bamboo fiber reinforced composite material, is take the bamboo steam explosion pulp fiber as strongthener, take nylon, ABS, polypropylene as matrix, and preparation fiber-like reinforced composite.Process but vegetable fibre is not carried out modification, can only do the matrix material of general property, limited the Application Areas of product.
Summary of the invention
The present invention is directed to problems of the prior art, provide a kind of natural bamboo fibres composite modified and reinforced polypropylene compound material, this material has the characteristics such as good mechanical performance, environmental protection, sound absorption, heat insulation, low density, low-shrinkage, machine-shaping property are good, degradable.Another object of the present invention provides above-mentioned modified bamboo fiber reinforced polypropylene composite manufacture method.
In order to achieve the above object, the present invention realizes by following technical proposal:
A kind of modification bamboo-fiber-reinforced polypropylene composite material is made of by weight following component:
Acrylic resin: 60-80;
Bamboo fibers: 10-30;
Compatilizer: 0.5-2;
Coupling agent: 0.5-2
Chemical modifier: 0.8-1.5
Oxidation inhibitor: 0.2-0.6;
Thermo-stabilizer: 0.2-0.6;
Uv-absorbing agent: 0.2-0.6;
Dispersion agent: 0.1-0.6;
Processing aid: 0.2-1.0.
Described acrylic resin is homopolymerization polypropylene and/or Co-polypropylene, and the melt flow rate (MFR) of acrylic resin is 10-25g/10min.
Described bamboo fibers is the newborn bamboo fiber of getting that 1-3 gives birth to, and its content of cellulose is more than 60%.
Described compatilizer is polypropylene grafted maleic anhydride (PP-g-MAH) or polypropylene grafted vinylbenzene (PP-g-PS).
Described coupling agent is a kind of for being selected among silicane KH550, KH560, the KH570, or a kind of among titanate ester NDZ-101, the NDZ-40.
Described chemical modifier is dihydro-2,5-dioxo furans, chromium picolinate or Aluminate.
Described thermo-stabilizer is to be selected from least a in thiol methyl tin, toxilic acid tin octylate, the stannous sulfate.
Described oxidation inhibitor is four (β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid) one or both in pentaerythritol ester (1010), three (2,4-di-tert-butyl-phenyl) phosphorous acid ester (168), the two stearyl alcohol esters (DSTDP) of thio-2 acid.
Described processing aid is calcium stearate (Ca-St
2), ethylene bis stearamide (EBS) or modification ethylene bis stearamide (TAF).
Described uv-absorbing agent is salicylic acid phenyl ester, 2-(2'-hydroxyl-5'-aminomethyl phenyl) benzotriazole, 2,4-dihydroxy benaophenonel, Octabenzone, 2-(2'-hydroxyl-3', 5'-two uncle's phenyl)-5-chlorination benzotriazole or polyolefin-based black masterbatch.
Described dispersion agent is two sodium polyphosphates, triethyl hexyl sodium phosphate, sodium lauryl sulphate or fatty acid polyglycol ester.
A kind of method for preparing above-mentioned modification bamboo-fiber-reinforced polypropylene composite material may further comprise the steps:
(1) preparation of natural bamboo fibres:
Natural bamboo is made the bamboo fiber crops after heating treatment step, the bamboo fiber crops through acid treatment, alkaline purification, beat the natural bamboo fibres that bleaching process, fermentation procedure and combing cutting operation obtain certain-length, chopped natural fiber disperses through ultrasonic wave, microwave heating fast dewatering, drying.
(2) bamboo fibers is composite modified:
The dry chopped natural bamboo fibres that (1) is obtained carries out after the surface-coated with silane coupling agent and compatilizer, dispersion agent through the reaction of heated at high speed mixing machine, the maleic anhydride in the compatilizer first with natural fiber in hydroxyl (-OH) esterification occurs; The carboxyl that reaction process produces (-COOH) again with natural fiber in hydroxyl (-OH) follow-up esterification occurs, at last the modified bamboo fiber;
(3) modified bamboo fiber reinforced polypropylene composite manufacture:
First acrylic resin, chemical modifier, thermo-stabilizer, processing aid, uv-absorbing agent, oxidation inhibitor are put into together by the quality formula rate and to be carried out in the heated at high speed mixing machine adding after the blending dispersion in the twin screw extruder, again the side spout of modified bamboo fiber in (2) from forcing machine added, carry out melt pelletization, modified bamboo fiber and acrylic resin fully plastify, again by obtaining natural modification bamboo-fiber-reinforced polypropylene composite material after the typing of mouth mould, water-cooled, air-dry, the pelletizing.
The time of microwave heating is 2-5min in the described step (1); The length-to-diameter ratio of twin screw extruder is 35-40 in the described step (3): 1, and the temperature of melt pelletization is 160-210 ℃.
To be a kind of surface-modifying agent for coupling agent and chemical modifier among the present invention, but the object of their surface modification is different.Coupling agent is for the surface of vegetable fibre being done the nonpolar reason in place, but coupling agent is not to reach 100% to the nonpolar processing of vegetable fibre.So for the fully combination of surface of vegetable fibre and polypropylene base-material, so adopted again chemical modifier to do polar-modified to the part of vegetable fibre and polypropylene base-material.Thereby so that nonpolar polypropylene is connected the vegetable fibre surface and is connected completely combination with polarity, increase the bonding force on their surfaces.
Oxidation inhibitor in the invention is in order to prevent the polypropylene base-material by airborne dioxygen oxidation, has been equivalent to improve the weathering resistance of product of the material in later stage.Thermo-stabilizer is to improve the especially stability of fiber in the twin screw course of processing of whole prescription, so that fiber does not decompose and changes.
The present invention compared with prior art has following some advantage:
1, preparation method of the present invention is simple, utilizes the combined utilization of ultrasonic wave dispersion technology and microwave heating technique, thereby has simplified greatly production process, and the production efficiency of bamboo fiber products is improved greatly than conventional production methods;
2, the dry fast eliminating of chopped natural fiber heated by microwave the moisture of fiber surface, the time that dehydrates reduces to 2-5min by the 10-40h of routine.
3, utilize bamboo fibers and polypropylene, chemical modifier blend, in its two-phase interface, chemical modifier can with the combination of bamboo fibers generation chemical bond, play coupled action, thereby improve the bonding strength of two-phase interface, the modified bamboo fibre property of preparing is more superior;
4, the modification on bamboo fibers surface combined with the chemical modification of polypropylene surface, the interlocking so that the chemical bond between polypropylene and the bamboo fibers mutually combines, in conjunction with can be larger, the interface modification effect be more excellent;
5, the material that makes has that environmental protection, sound absorption, heat insulation, low density, low-shrinkage, machine-shaping property are good, degradable and good comprehensive mechanical property.
Embodiment:
The below provides embodiment so that the present invention is carried out concrete description; be necessary to be pointed out that at this following examples only are used for the present invention is further specified; can not be interpreted as limiting the scope of the invention, content still belongs to protection scope of the present invention to some nonessential improvement and the adjustment that the present invention makes to the person skilled in the art in this field according to the present invention.
In the present invention, the first step need prepare first natural bamboo fibres, be about to natural bamboo and after heating treatment step, make the bamboo fiber crops, the bamboo fiber crops through acid treatment, alkaline purification, beat the natural bamboo fibres that bleaching process, fermentation procedure and combing cutting operation obtain certain-length, chopped natural fiber disperses through ultrasonic wave, microwave heating fast dewatering, drying.
Second step carries out composite modified to above-mentioned chopped natural bamboo fibres, carry out surface-coated after with silane coupling agent the chopped natural bamboo fibres of drying and compatilizer, dispersion agent through the reaction of heated at high speed mixing machine, the maleic anhydride in the compatilizer first with natural fiber in hydroxyl (-OH) esterification occurs; The carboxyl that reaction process produces (-COOH) again with natural fiber in hydroxyl (-OH) follow-up esterification occurs, at last the modified bamboo fiber;
The 3rd step was preparation modification bamboo-fiber-reinforced polypropylene composite material, first acrylic resin, chemical modifier, thermo-stabilizer, processing aid, uv-absorbing agent, oxidation inhibitor are put into together by the quality formula rate and to be carried out in the heated at high speed mixing machine adding again in the twin screw extruder after the blending dispersion, again the side spout of modified bamboo fiber from forcing machine added, carry out melt pelletization, modified bamboo fiber and acrylic resin fully plastify, again by obtaining natural modification bamboo-fiber-reinforced polypropylene composite material after the typing of mouth mould, water-cooled, air-dry, the pelletizing.
All components of the present invention are existing commercially available prod, and unit is weight part.The following examples all are to be prepared as stated above, existing only are illustrated as follows to the compositing formula of matrix material:
Embodiment 1:
60 parts of homo-polypropylene
20 parts of Co-polypropylene
10 parts of bamboo fiberss
1 part of coupling agent: KH550
Compatilizer: 1 part of polypropylene grafted maleic anhydride
Chemical modifier: dihydro-2,1 part in 5-dioxo furans
Antioxidant: (1010/168=1: 1 mass ratio) 0.2 part
Thermo-stabilizer: 0.2 part of thiol methyl tin
Uv-absorbing agent: 0.3 part of salicylic acid phenyl ester
Dispersion agent: 0.3 part of two sodium polyphosphate
Processing aid: 0.5 part of calcium stearate
Embodiment 2:
77 parts of homo-polypropylene resins
20 parts of bamboo fiberss
2 parts of coupling agent: KH560
Compatilizer: 2 parts of polypropylene grafted vinylbenzene
Chemical modifier: 0.8 part of chromium picolinate
Antioxidant: (1010/DSTDP=1: 1 mass ratio) 0.6 part
Thermo-stabilizer: 0.2 part of toxilic acid tin octylate
Uv-absorbing agent: 2-(2'-hydroxyl-5'-aminomethyl phenyl) benzotriazole is 0.2 part
Dispersion agent: 0.1 part of triethyl hexyl sodium phosphate
Processing aid: 0.2 part of ethylene bis stearamide
Embodiment 3:
67 parts of Co-polypropylene resins
30 parts of bamboo fiberss
0.5 part of coupling agent: KH570
Compatilizer: 0.5 part of polypropylene grafted vinylbenzene
Chemical modifier: 1.5 parts of Aluminates
Antioxidant: (1010/DSTDP=1: 1 mass ratio) 0.2 part
Thermo-stabilizer: 0.6 part of stannous sulfate
Uv-absorbing agent: 0.6 part of 2,4 dihydroxyl benzophenone
Dispersion agent: 0.6 part of sodium lauryl sulphate
Processing aid: 1.0 parts of modification ethylene bis stearamides
Embodiment 4:
40 parts of homo-polypropylene resins
20 parts of Co-polypropylene resins
30 parts of bamboo fiberss
1 part of coupling agent: NDZ-101
Compatilizer: 1 part of polypropylene grafted maleic anhydride
Chemical modifier: dihydro-2,1 part in 5-dioxo furans
Chemical modifier: 0.5 part of chromium picolinate
Antioxidant: (DSTDP/168=1: 1 mass ratio) 0.4 part
Thermo-stabilizer: 0.2 part of thiol methyl tin
Thermo-stabilizer: 0.2 part of toxilic acid tin octylate
Uv-absorbing agent: 0.2 part of salicylic acid phenyl ester
Uv-absorbing agent: 0.1 part of Octabenzone
Dispersion agent: 0.3 part of two sodium polyphosphate
Processing aid: 0.5 part of calcium stearate
Processing aid: 0.5 part of fatty acid polyglycol ester
Embodiment 5:
The sample of above-described embodiment 1-4 is injection molded into the GB batten according to unified technique, according to testing standard and condition it is carried out respectively measuring mechanical property, its test data is as shown in the table.
The main physical index of natural fiber reinforced polypropylene composite material:
| Project | Testing standard | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| Melt flow rate (MFR) g/10min | GB/T3682 | 18 | 12 | 8 | 10 |
| Shrinking percentage % | GB/T15585 | 1.4-1.5 | 1.2-1.4 | 1.1-1.3 | 0.9-1.1 |
| Density g/cm3 | GB/T1033 | 0.9 | 0.92 | 0.93 | 0.95 |
| Tensile strength MPa | GB/T1040 | 28.8 | 27.6 | 26.2 | 26.1 |
| Flexural strength MPa | GB/T9341 | 31.5 | 32.3 | 30.7 | 30.8 |
| Modulus in flexure MPa | GB/T9341 | 1360 | 1530 | 1680 | 1690 |
| Notch shock KJ/m2 | GB/T1843 | 6.5 | 7.2 | 6.9 | 6.8 |
Can find out that from upper table data composite modified vegetable fibre filler reinforced polypropylene composite material has good mechanical performance, especially keep the overall equilbrium of intensity, modulus and the toughness of composite modification material, enlarge the Application Areas of material.Simultaneously this matrix material has the good characteristics such as low density, low-shrinkage, machine-shaping property be good, and the characteristics such as the environmental protection of material, sound absorption, heat insulation, degradable meet the development trend of environmental friendliness shaped material.
Claims (13)
1. modification bamboo-fiber-reinforced polypropylene composite material is characterized in that: be comprised of by weight following component:
Acrylic resin: 60-80;
Bamboo fibers: 10-30;
Compatilizer: 0.5-2;
Coupling agent: 0.5-2;
Chemical modifier: 0.8-1.5
Oxidation inhibitor: 0.2-0.6;
Thermo-stabilizer: 0.2-0.6;
Uv-absorbing agent: 0.2-0.6;
Dispersion agent: 0.1-0.6;
Processing aid: 0.2-1.0.
2. a kind of modification bamboo-fiber-reinforced polypropylene composite material according to claim 1, it is characterized in that: described acrylic resin is homopolymerization polypropylene and/or Co-polypropylene, the melt flow rate (MFR) of acrylic resin is 10-25g/10min.
3. a kind of modification bamboo-fiber-reinforced polypropylene composite material according to claim 1 is characterized in that: described bamboo fibers is the newborn bamboo fiber of getting that 1-3 gives birth to, and its content of cellulose is more than 60%.
4. a kind of modification bamboo-fiber-reinforced polypropylene composite material according to claim 1, it is characterized in that: described compatilizer is polypropylene grafted maleic anhydride (PP-g-MAH) or polypropylene grafted vinylbenzene (PP-g-PS).
5. a kind of modification bamboo-fiber-reinforced polypropylene composite material according to claim 1, it is characterized in that: described coupling agent is a kind of for being selected among silicane KH550, KH560, the KH570, or a kind of among titanate ester NDZ-101, the NDZ-40.
6. a kind of modification bamboo-fiber-reinforced polypropylene composite material according to claim 1, it is characterized in that: described chemical modifier is dihydro-2,5-dioxo furans, chromium picolinate or Aluminate.
7. a kind of modification bamboo-fiber-reinforced polypropylene composite material according to claim 1, it is characterized in that: described thermo-stabilizer is for being selected from thiol methyl tin, toxilic acid tin octylate or stannous sulfate.
8. a kind of modification bamboo-fiber-reinforced polypropylene composite material according to claim 1, it is characterized in that: described oxidation inhibitor is four (β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid) in the two stearyl alcohol esters (DSTDP) of pentaerythritol ester (1010), three (2,4-di-tert-butyl-phenyl) phosphorous acid ester (168), thio-2 acid one or both.
9. a kind of modification bamboo-fiber-reinforced polypropylene composite material according to claim 1, it is characterized in that: described processing aid is calcium stearate (Ca-St
2), ethylene bis stearamide (EBS) or modification ethylene bis stearamide (TAF)
A kind of modification bamboo-fiber-reinforced polypropylene composite material according to claim 1, it is characterized in that: described uv-absorbing agent is salicylic acid phenyl ester, 2-(2'-hydroxyl-5'-aminomethyl phenyl) benzotriazole, 2,4-dihydroxy benaophenonel, Octabenzone, 2-(2'-hydroxyl-3', 5'-two uncle's phenyl)-5-chlorination benzotriazole or polyolefin-based black masterbatch.
10. a kind of modification bamboo-fiber-reinforced polypropylene composite material according to claim 1, it is characterized in that: described dispersion agent is two sodium polyphosphates, triethyl hexyl sodium phosphate, sodium lauryl sulphate or fatty acid polyglycol ester.
11. one kind prepares as claimed in claim 1 a kind of method of modification bamboo-fiber-reinforced polypropylene composite material, it is characterized in that: may further comprise the steps:
(1) preparation of natural bamboo fibres:
Natural bamboo is made the bamboo fiber crops after heating treatment step, the bamboo fiber crops through acid treatment, alkaline purification, beat the natural bamboo fibres that bleaching process, fermentation procedure and combing cutting operation obtain certain-length, chopped natural fiber disperses through ultrasonic wave, microwave heating fast dewatering, drying.
12.(2) bamboo fibers is composite modified:
The dry chopped natural bamboo fibres that (1) is obtained carries out after the surface-coated with silane coupling agent and compatilizer, dispersion agent through the reaction of heated at high speed mixing machine, the maleic anhydride in the compatilizer first with natural fiber in hydroxyl (-OH) esterification occurs; The carboxyl that reaction process produces (-COOH) again with natural fiber in hydroxyl (-OH) follow-up esterification occurs, at last the modified bamboo fiber;
(3) modified bamboo fiber reinforced polypropylene composite manufacture:
First acrylic resin, chemical modifier, thermo-stabilizer, processing aid, uv-absorbing agent, oxidation inhibitor are put into together by the quality formula rate and to be carried out in the heated at high speed mixing machine adding after the blending dispersion in the twin screw extruder, again the side spout of modified bamboo fiber in (2) from forcing machine added, carry out melt pelletization, modified bamboo fiber and acrylic resin fully plastify, again by obtaining natural modification bamboo-fiber-reinforced polypropylene composite material after the typing of mouth mould, water-cooled, air-dry, the pelletizing.
13. described method according to claim 12 is characterized in that: the time of microwave heating is 2-5min in the described step (1); The length-to-diameter ratio of twin screw extruder is 35-40 in the described step (3): 1, and the temperature of melt pelletization is 160-210 ℃.
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| CN103965549A (en) * | 2014-05-22 | 2014-08-06 | 北京汽车股份有限公司 | Bamboo-fiber composite material and application thereof in manufacture of automobile side impact buffer module |
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