CN104448563A - Carbon fiber reinforced polypropylene micro-foaming material and preparation method thereof - Google Patents
Carbon fiber reinforced polypropylene micro-foaming material and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/042—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with carbon fibres
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—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
- 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
- C08J9/08—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 carbon dioxide
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—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
- 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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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—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
- 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
- C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
- C08J9/105—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof containing sulfur
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- 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
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention relates to a micro-foaming material and a preparation method thereof and particularly relates to a carbon fiber reinforced polypropylene micro-foaming material and a preparation method thereof and belongs to the technical field of high-molecular materials. The carbon fiber reinforced polypropylene micro-foaming material comprises the following components in parts by weight: 40-70 parts of polypropylene, 0-40 parts of inorganic powder, 5-40 parts of carbon fiber,1-8 parts of a compatibilizing agent, 1-5 parts of foaming masterbatch and 0.5-2 parts of an antioxidant. The carbon fiber reinforced polypropylene micro-foaming material has the beneficial effects that by combining a carbon fiber reinforcement technology having characteristics of light weight, high strength, high modulus and high heat resistance and a microcellular foaming technology, the prepared material is lightweight, the bending strength, tensile strength, modulus and heat resistance of the prepared material are significantly improved and the high-performance polypropylene micro-foaming material having light-weight characteristic is obtained. Products can be applied to automotive structural parts, such as front-end brackets, seats, cooling fans, a shifter pedestal, fenders, wheel cover plates so as to achieve material weight reduction of the automotive structural parts; and the products can also be used in other fields, such as building, electronics and shipbuilding.
Description
Technical field
The present invention relates to a kind of polypropylene micro foaming composite material and preparation method thereof, especially a kind of fibre reinforced polypropylene micro foaming composite material and preparation method thereof, belongs to technical field of polymer materials.
Background technology
The energy is day by day exhausted, and environmental pollution is more and more serious, accelerates the change of automotive industry.Car mass often alleviates 10%, and oil consumption declines 6% ~ 8%, and quantity discharged declines 4%.Automotive light weight technology directly improves the specific power of automobile simultaneously, and the dynamic performance of automobile is improved.Therefore, lightweight becomes the inexorable trend of automobile industry development.Wherein, automotive material lightweight realizes the light-weighted effective way of car load.Fretting map technology a kind ofly can prepare the technology with exclusive dense skin and foam core structure material.Be introduced in the technology of preparing of automotive material, under the prerequisite ensureing material fundamental property, significantly alleviate part weight, be conducive to automobile lightweight.Wherein, the polypropylene micro-foaming material with lightweight feature substitutes solid material, when performance meets, and component loss of weight more than 10%.At partial automobile parts, as the parts such as dashboard, seat, trunk cover plate are applied, wide market.
But for structural partsof automobiles, such as, inner plate of car door module, front-end bracket, cooling fan, selector base, engine circumferential component etc., current polypropylene micro-foaming material also cannot meet service requirements in intensity and rigidity.Therefore, in order to be issued to above-mentioned parts performance requriements meeting the light-weighted prerequisite of trolley part, expand its range of application in trolley part, intensity and the rigidity of significantly improving polypropylene micro-foaming material become crucial.Patent CN102675734A discloses a kind of preparation method of fiber glass reinforced polypropylene micro-foaming material, supercutical fluid is injected the fiber glass reinforced polypropylene material of screw in injection molding machine homogenizing zone melting, then by injection moulding, fiber glass reinforced polypropylene micro-foaming material is obtained; Although polypropylene micro-foaming material intensity and rigidity obtain promote, but, still cannot meet the performance requriements in the application of vehicle structure product, be difficult to realize the application of polypropylene micro-foaming material on these structural parts.
Summary of the invention
The present invention is based on carbon fiber lightweight, high-strength, Gao Mo, high heat-resistant quality, adopt fibre reinforced and microporous foam combined technology, under guaranteeing polypropylene micro-foaming material lightweight advantage prerequisite, significantly improve its tension, bending strength, modulus and resistance toheat, make it can be applicable to structural partsof automobiles.This patent obtains the high-performance polypropylene micro-foaming material with lightweight feature, and provides the preparation method of this material.Technique is simple, and production efficiency is high, be easy to realize industrialization.
The present invention is technical solution problem by the following technical programs: a kind of fibre reinforced polypropylene micro foaming composite material, by weight, takes polypropylene 40-70 part, inorganic powder 0-40 part, oxidation inhibitor 0.2-2 part, compatilizer 1-8 part.
Above component proportionally joined in high-speed mixer, mixing 4-6min, obtains uniform mixture; Wherein, polypropylene base-material melting index is the polypropylene of 5-60g/10min, preferred 10-40g/10min; Inorganic mineral powder is the one in calcium carbonate and talcum powder, preferably talc powder; Primary antioxidant is selected from one or more in Hinered phenols and sulphur ester antioxidant, and preferably 1010, auxiliary anti-oxidant is selected from one or more in phosphorous acid salt and phosphite ester kind antioxidant, and preferably 168; Compatilizer is the one in horse Lay anhydride grafted lldpe type, horse Lay anhydride-grafted polypropylene type, preferred horse Lay anhydride-grafted polypropylene type,
Said components mixture is added twin screw extruder by hopper, by carbon fiber 5-40 part, joins in twin screw extruder machine barrel by spout in the middle part of forcing machine, carry out extruding pelletization, obtain carbon fiber reinforced polypropylene composite material; Wherein, carbon fiber is continuous carbon fibre, carbon content >=95%, tensile strength >=4000MPa, and filament diameter is the fiber of 5 ~ 8 μm, preferred tensile strength 4900MPa, and diameter is the carbon fiber of 7 μm; Twin-screw extruder barrel temperature is 170-270 DEG C, screw speed 50r/min;
Obtained carbon fiber reinforced polypropylene composite material 95-99 part is put into mixing machine with whipping agent 1-5 part mix; In whipping agent master batch whipping agent be bicarbonate of ammonia, sodium bicarbonate, Cellmic C 121, toluene sulfonephthalein Urea,amino-, the composition of one or more in azo two amine carbonate, preferred Cellmic C 121.
Join in injection moulding machine by carbon fiber reinforced polypropylene composite material and blowing agent blends, injection moulding obtains fibre reinforced polypropylene micro foaming composite material.Injecting machine material tube temperature is set to 180-280 DEG C, and injection pressure is 60-80MPa, and injection speed is 50-80mm/s, and cooling time is 10-30s.
The invention has the beneficial effects as follows: compare and do not add fibre and conventional fiber glass reinforced polypropylene micro-foaming material, fibre reinforced combines while further lightening material weight with microporous foam technology, significantly improve tensile strength, modulus, shock resistance and resistance toheat, meet automotive industry to the requirement of polypropylene micro-foaming material high performance.Product may be used on the inside and outside plastic structural part of automobile, replaces existing solid modified polypropene Injection moulded part, and can replace part Engineering Plastics Parts, realize automotive material lightweight; Also can be used for other field, such as building, electronics, shipbuilding industry etc.
Embodiment
Embodiment one
Be the polypropylene 40 parts of 10g/10min by melting index, the mixture of talcum powder 26 parts, compatilizer 8 parts, irgasfos 168 0.6 part, antioxidant 1010 0.4 part puts into high-speed mixer, mix 6 minutes, then, said components mixture is added twin screw extruder via hopper, 20 parts, carbon fiber is added via spout in the middle part of forcing machine, extrude and granulation simultaneously, obtain fibre reinforced polypropylene composite material.Twin-screw extruder barrel temperature is set to 170-270 DEG C, screw speed 50r/min; Finally mixed with 95 parts of above-mentioned pellets of extruding by 5 parts of foaming master batchs, add in injection moulding machine, injection moulding obtains fibre reinforced polypropylene micro foaming composite material.Injecting machine material tube temperature is set to 180-280 DEG C, and injection pressure is 60MPa, and injection speed is 70mm/s, and cooling time is 10s.Gained micro-foaming material is as shown in the table with the performance comparison not adding fiber and glass fiber reinforced materials:
Table 1 fibre reinforced micro-foaming material with do not add fibre, the material property of conventional fiberglass reinforced contrasts
Embodiment two
Be the polypropylene 70 parts of 20g/10min by melting index, the mixture of talcum powder 0 part, compatilizer 1 part, irgasfos 168 0.3 part, antioxidant 1010 0.2 part puts into high-speed mixer, mix 4 minutes, then, said components mixture is added twin screw extruder via hopper, 27.5 parts, carbon fiber is added via spout in the middle part of forcing machine, extrude and granulation simultaneously, obtain fibre reinforced polypropylene composite material.Twin-screw extruder barrel temperature is set to 170-270 DEG C, screw speed 50r/min; Finally mixed with 99 parts of above-mentioned pellets of extruding by 1 part of foaming master batch, add in injection moulding machine, injection moulding obtains fibre reinforced polypropylene micro foaming composite material.Injecting machine material tube temperature is set to 180-280 DEG C, and injection pressure is 70MPa, and injection speed is 80mm/s, and cooling time is 17s.Gained micro-foaming material is as shown in the table with the performance comparison not adding fiber and glass fiber reinforced materials:
Table 2 fibre reinforced micro-foaming material with do not add fibre, the material property of conventional fiberglass reinforced contrasts
Embodiment three
Be the polypropylene 53 parts of 60g/10min by melting index, the mixture of talcum powder 10 parts, compatilizer 2 parts, irgasfos 168 1.2 parts, antioxidant 1010 0.8 part puts into high-speed mixer, mix 5 minutes, then, said components mixture is added twin screw extruder via hopper, 30 parts, carbon fiber is added via spout in the middle part of forcing machine, extrude and granulation simultaneously, obtain fibre reinforced polypropylene composite material.Twin-screw extruder barrel temperature is set to 170-270 DEG C, screw speed 50r/min; Finally mixed with 97 parts of above-mentioned pellets of extruding by 3 parts of foaming master batchs, add in injection moulding machine, injection moulding obtains fibre reinforced polypropylene micro foaming composite material.Injecting machine material tube temperature is set to 180-280 DEG C, and injection pressure is 80MPa, and injection speed is 50mm/s, and cooling time is 30s.Gained micro-foaming material is as shown in the table with the performance comparison not adding fiber and glass fiber reinforced materials:
Table 3 fibre reinforced micro-foaming material with do not add fibre, the material property of conventional fiberglass reinforced contrasts
Embodiment four
Be the polypropylene 47 parts of 40g/10min by melting index, the mixture of talcum powder 40 parts, compatilizer 5 parts, irgasfos 168 0.6 part, antioxidant 1010 0.4 part puts into high-speed mixer, mix 4 minutes, then, said components mixture is added twin screw extruder via hopper, 5 parts, carbon fiber is added via spout in the middle part of forcing machine, extrude and granulation simultaneously, obtain fibre reinforced polypropylene composite material.Twin-screw extruder barrel temperature is set to 170-270 DEG C, screw speed 50r/min; Finally mixed with 98 parts of above-mentioned pellets of extruding by 2 parts of foaming master batchs, add in injection moulding machine, injection moulding obtains fibre reinforced polypropylene micro foaming composite material.Injecting machine material tube temperature is set to 180-280 DEG C, and injection pressure is 70MPa, and injection speed is 60mm/s, and cooling time is 25s.Gained micro-foaming material is as shown in the table with the performance comparison not adding fiber and glass fiber reinforced materials:
Table 4 fibre reinforced micro-foaming material with do not add fibre, the material property of conventional fiberglass reinforced contrasts
| Test item | Standard | Do not add fibre | Conventional glass | Embodiment four |
| Density/g/cm3 | ISO 1183 | 1.15 | 1.13 | 1.09 |
| Tensile strength/MPa | ISO 527 | 27.7 | 34.1 | 50.4 |
| Modulus in flexure/MPa | ISO 178 | 4000 | 4600 | 5800 |
| Simply supported beam non-notch | ISO 180 | 23 | 38 | 37 |
| Shock strength/kJ/m 2 | ||||
| Heat-drawn wire/DEG C | ISO 75 | 120 | 127 | 140 |
As can be seen from above embodiment with do not add fibre, conventional fiber glass reinforced polypropylene micro-foaming material performance comparison, fibre reinforced combines with microporous foam technology, makes polypropylene micro-foaming material have lighter quality, ensure that material lightweight feature.Carbon fiber has polypropylene micro-foaming material mechanics and resistance toheat and significantly promotes effect, and intensity, rigidity and heat-drawn wire are obviously better than the former two's.Another feature of the present invention obviously shortens the process-cycle, significantly reduces production cost.Product has excellent dimensional stability.In addition, can according to different demand, adjustment formula rate, reaches required target capabilities, reduces material usage.
The present invention adopts Carbon Fiber Reinforced Technique, under guarantee realizes the light-weighted prerequisite of polypropylene material, effectively improves product size stability, significantly improves goods rigidity, intensity and resistance toheat, realize polypropylene micro-foaming material high performance.Meanwhile, shorten the process-cycle, enhance productivity.This product realizes by common Shooting Technique, simple to operate, practical.Product, except being applicable to the inside and outside plastic construction product of automobile, also can be used for the industry fields such as building, electronics, sports equipment.
The foregoing is only the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those of ordinary skill in the art are in technical scope of the present invention, and the change can expected without creative work or replacement, all should be encompassed within protection scope of the present invention.
Claims (8)
1. a fibre reinforced polypropylene micro-foaming material, raw material is made up of the component of following weight part:
Polypropylene 40-70 part
Carbon fiber 5-30 part
Inorganic powder 0-40 part
Whipping agent master batch 1-5 part
Compatilizer 1-8 part
Oxidation inhibitor 0.5-2 part.
2. fibre reinforced polypropylene micro-foaming material according to claim 1, is characterized in that: described polyacrylic melting index is 5-60g/10min.
3. carbon fiber according to claim 1, is characterized in that: described carbon fiber is continuous fibre, carbon content >=95%, tensile strength >=4000MPa, carbon fiber diameter 5 ~ 8 μm.
4. fibre reinforced polypropylene micro-foaming material according to claim 1, is characterized in that: described inorganic powder is talcum powder or calcium carbonate.
5. fibre reinforced polypropylene micro-foaming material according to claim 1, is characterized in that: described whipping agent master batch major ingredient be bicarbonate of ammonia, sodium bicarbonate, Cellmic C 121, toluene sulfonephthalein Urea,amino-, at least one in azo two amine carbonate.
6. fibre reinforced polypropylene micro-foaming material according to claim 1, it is characterized in that: described oxidation inhibitor is divided into primary antioxidant and auxiliary anti-oxidant, add according to the ratio of 2:3, described primary antioxidant is selected from least one in Hinered phenols and sulphur ester antioxidant, and auxiliary anti-oxidant is selected from least one in phosphorous acid salt and phosphite ester kind antioxidant.
7. the preparation method of either carbon fiber reinforced polypropylene micro-foaming material according to claim 1-6, comprises the following steps:
Step one, polypropylene, inorganic powder, oxidation inhibitor are put into high-speed mixer mixing 4-6min by described part by weight, obtain above component uniform mixture;
Step 2, said components mixture is added twin screw extruder by hopper, carbon fiber joins in twin screw extruder by side spout, carries out extruding pelletization, obtains carbon fiber reinforced polypropylene composite material;
Step 3, described carbon fiber reinforced polypropylene composite material and whipping agent are put into mixing machine in proportion mix, both acquisitions mixture;
Step 4, described mixture is joined in injection moulding machine, injection moulding obtains high-performance carbon fibre Reinforced Polypropylene micro-foaming material, injecting machine material tube temperature 180-280 DEG C, and injection pressure is 60-80MPa, injection speed is 50-80mm/s, and cooling time is 10-30s.
8. the preparation method of fibre reinforced polypropylene micro-foaming material according to claim 7, it is characterized in that: in described step one, twin-screw extruder barrel temperature is 170-270 DEG C, screw speed 50r/min.
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| CN105038217A (en) * | 2015-08-07 | 2015-11-11 | 南京聚隆科技股份有限公司 | Carbon fiber reinforced nylon micro-foaming material and preparation method thereof |
| CN105802008A (en) * | 2016-03-25 | 2016-07-27 | 上海天原集团胜德塑料有限公司 | Nonwoven fabric wheel casing and one-time forming method thereof |
| CN105924778A (en) * | 2016-05-25 | 2016-09-07 | 广州聚注专利研发有限公司 | Polypropylene microcellular foam composite material and preparation method thereof |
| CN106009258A (en) * | 2016-05-25 | 2016-10-12 | 广州聚注专利研发有限公司 | Homo-polypropylene/carbon fiber/montmorillonite composite material and preparation method thereof |
| CN108794884A (en) * | 2018-05-25 | 2018-11-13 | 宁波星陆汽车部件有限公司 | Nano modification Anti-aging, high-strength degree wheel cover preparation process |
| CN111019321A (en) * | 2019-11-27 | 2020-04-17 | 内蒙古民族大学 | High-molecular heat-insulating material and preparation method thereof |
| CN111098466A (en) * | 2019-12-26 | 2020-05-05 | 苏州市爱司特塑胶五金有限公司 | Injection molding process of carbon fiber polypropylene composite material |
| CN112210164A (en) * | 2020-09-16 | 2021-01-12 | 金发科技股份有限公司 | Polyolefin material and preparation method thereof |
| CN113150441A (en) * | 2021-04-14 | 2021-07-23 | 华南理工大学 | Carbon fiber reinforced polypropylene foam composite material and preparation method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105038217A (en) * | 2015-08-07 | 2015-11-11 | 南京聚隆科技股份有限公司 | Carbon fiber reinforced nylon micro-foaming material and preparation method thereof |
| CN105802008A (en) * | 2016-03-25 | 2016-07-27 | 上海天原集团胜德塑料有限公司 | Nonwoven fabric wheel casing and one-time forming method thereof |
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Application publication date: 20150325 |