CN104877237A - Polypropylene composite materials, preparation method and application - Google Patents
Polypropylene composite materials, preparation method and application Download PDFInfo
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- CN104877237A CN104877237A CN201510345209.6A CN201510345209A CN104877237A CN 104877237 A CN104877237 A CN 104877237A CN 201510345209 A CN201510345209 A CN 201510345209A CN 104877237 A CN104877237 A CN 104877237A
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- polypropylene composite
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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
- 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
- C08L23/14—Copolymers of propene
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses polypropylene composite materials, a preparation method and application. The polypropylene composite materials are characterized by being prepared from, by mass percent, the raw materials of 40%-80% of polypropylene resin, 5%-15% of elastomer, 5%-30% of silicon dioxide, 5%-30% of mineral filler, 1%-10% of wear-resistant agents, 0.1%-2% of lubricating agents and 0.1%-5% of other addition agents. The polypropylene composite materials have the advantages of being low in linear expansion coefficient, high in cold tolerance and wear resistance and the like, can be applied to injection molding of both vacuum cup inner layer cup cap injection molding pieces which have friction with metal, and meanwhile can be applied to injection molding of house hold appliances and automobile parts.
Description
Technical field
The invention belongs to high polymer material technology and scientific domain, be specifically related to a kind of modified polypropylene composite material, particularly the polypropylene composite material and preparation method thereof of a kind of low coefficient of linear expansion, high winter hardiness, high-wearing feature and purposes.
Background technology
Polypropylene (PP) has high comprehensive performance, abundant raw material source, the advantages such as designability is strong, it is particularly worth mentioning that polyacrylic toxicity is less, chemical stability is good, in use discharge without toxic substance, less to harm, it is made to increase gradually in Food industry application, but under working conditions requires higher situation, as during for injection moulding thermos cup internal layer bowl cover, then require that it possesses following performance: 1, low coefficient of linear expansion, because vacuum cup cover is by inner plastic bowl cover with outer layer metal bowl cover is supporting forms, and use in the environment that thermos cup colds and heat succeed each other through being everlasting, then require that inner layer material has lower coefficient of linear expansion, to guarantee the dimensional stabilizing of moulding, prevent thermos cup internal layer bowl cover from coming off from metal bowl cover, thus avoid the leak of liquid in cup to cause potential safety hazard, 2, wear resisting property is excellent, thermos cup internal layer bowl cover in use often with the mutual friction of metal threaded rim of a cup phase, then require that bowl cover material possesses higher wear resisting property, cause food-safety problem to prevent because bowl cover inner layer material wear resisting property is inadequate, 3, high winter hardiness, when thermos cup uses in cold district, guarantee that bowl cover inner layer material possesses enough cold tolerances, ensures that material does not produce stress cracking under normal use.Current industrial circle unmodified polypropylene material coefficient of linear expansion is comparatively large, and dimensional stability is poor, and Injection moulded part is easy after shaping produces distortion because internal stress concentrates, and wear resisting property is also poor simultaneously, limits polyacrylic widespread use.
In order to requirement of meeting a cassation, expert proposes the method reducing material coefficient of linear expansion, patent CN201310585465.3 discloses a kind of Isotropic polypropylene composition with low linear expansion coefficient and preparation method thereof, and this invention have employed a kind of whisker with three-D space structure makes polyacrylic coefficient of linear expansion be reduced to 4.0 × 10
-5, and when injection moulding, the flow direction (FD) of material has close coefficient of linear expansion with perpendicular flow direction (TD).But this patent does not relate to the wear resisting property of material and the introduction of resistance to low temperature.Patent CN104231515A discloses a kind of wear-resisting polypropene composite material, and the preparation method of this polypropylene composite material, this invention adopts the composite of calcium carbonate crystal whisker and aramid pulp, the polypropylene composite material of preparation all increases wear resisting property, rigidity and resistance toheat are material modified compared with conventional polypropylene, but this patent in the dimensional stability of material and low temperature resistant in do not introduce.
Along with the progress of science and technology and the development of polymer material science, a multi-usage type polypropylene composite material will be developed.Wherein particularly require that polypropylene composite material has low coefficient of linear expansion, high winter hardiness and high-wear resistance simultaneously.
Summary of the invention
An object of the present invention is to provide a kind of polypropylene composite material simultaneously with low coefficient of linear expansion, high winter hardiness and high-wear resistance.
Another object of the present invention is to provide preparation method and the application thereof of above-mentioned polypropylene composite material.
To achieve these goals, the technical scheme that the present invention takes is:
Polypropylene composite material of the present invention, its feature is: each raw material by the proportioning of mass percent is:
Acrylic resin 40%-80%;
Elastomerics 5%-15%;
Silicon-dioxide 5-30%;
Mineral filler 5-30%;
Anti-wear agent 1%-10%;
Lubricant 0.1%-2%;
Other additives 0.1%-5%;
Described acrylic resin is preferably the mixture of one or several compositions in homo-polypropylene resin and acrylic resin copolymer, the melt mass flow rate (MFR) of described acrylic resin is the Izod notched impact strength>=1KJ/m of 2-80g/10min, homo-polypropylene resin under the test condition of temperature 230 DEG C, load weight 2.16Kg
2(23 DEG C), the Izod notched impact strength>=5KJ/m of acrylic resin copolymer
2(23 DEG C).
Described elastomerics is preferably alpha olefin copolymer, and described alpha olefin copolymer is the mixture of one or more in ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-hexene co-polymers and ethylene-octene copolymer; Described elastomerics density is 0.850-0.940g/cm
3, melt mass flow rate is 0.1-40g/10min under the test condition of temperature 190 DEG C, load weight 2.16Kg.
Described silicon-dioxide is one or more mixtures of the medicinal white carbon black of micron order, preference card Bo Tebai carbon black M-5 or Degussa AEROSIL380.
Described mineral filler is ultra-fine high silicon pharmaceutical grade talcum powder, described ultra-fine high silicon pharmaceutical grade talcum powder be preferably: particle diameter is 0.1-3 μm, dioxide-containing silica >=65%, whiteness >=95, loss on ignition at 800 DEG C≤3%.
Described anti-wear agent is the mixture of one or more of silicone master batch, silicone powder and tetrafluoroethylene, preferred DOW CORNING MB50-002 silicone master batch.
Described lubricant is the mixture of one or more in amides lubricant, metal soap lubricant and oxidized polyethlene wax series lubricant agent, preferred CRODA Crodamide ER (UNISLIP 1753) or Korea S Anlong chemistry EBS etc.
Polypropylene composite material of the present invention can also comprise other additives, as oxidation inhibitor, nucleator, silicone master batch, compatilizer and/or pigment.Requiring according to different technologies can the independent or composite use to above-mentioned additive, 1010 of the preferred BASF AG of oxidation inhibitor.
The preparation method of polypropylene composite material of the present invention comprises following steps: acrylic resin, elastomerics, silicon-dioxide, mineral filler, anti-wear agent, lubricant and other additive are joined in proportion in high-speed mixer, after the mixing velocity of 1000r/min mixing 5min, by twin screw extruder carry out melting, blended, extrude, again after water cooling bracing, air-dry, pelletizing operation, obtain polypropylene composite material; The length-to-diameter ratio of described twin screw extruder is (65-20): 1, and twin screw extruder processing temperature is 170-250 DEG C, and vacuum tightness is 0.4-0.8MPa.
Polypropylene composite material of the present invention may be used in injection moulding thermos cup internal layer bowl cover moulding, injection moulding appliances parts and injection molded automobile product.
Compared with prior art tool of the present invention has the following advantages: polypropylene composite material of the present invention, there is low coefficient of linear expansion in the same way, guarantee that temperature replaces dimensional stabilizing in changing environment, polypropylene of the present invention has higher wear resisting property and high low-temperature impact-resistant performance simultaneously, variation of ambient temperature can be met comparatively large and to wear resisting property and the more high special Application Areas of cold tolerance requirement, as thermos cup internal layer bowl cover, automotive department divide exterior trimming parts, the parts such as household electrical appliances, power tool etc.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Following examples are raw materials used is:
PP1: acrylic resin copolymer, its MFR, temperature 230 DEG C, are 30g/10min under the test condition of load weight 2.16Kg, and the Izod notched impact strength of acrylic resin copolymer is>=5KJ/m
2(23 DEG C), select the JM-370 of carefree chemistry.
PP2: homo-polypropylene resin, its MFR, temperature 230 DEG C, are 1.5g/10min under the test condition of load weight 2.16Kg, and the Izod notched impact strength of homo-polypropylene resin is>=1KJ/m
2(23 DEG C), select the S1003 of Shanghai Secco Petrochemical Co., Ltd..
PP3: acrylic resin copolymer, its MFR, temperature 230 DEG C, are 35g/10min under the test condition of load weight 2.16Kg, and the Izod notched impact strength of homo-polypropylene resin is>=5KJ/m
2(23 DEG C), select the JM-370K of the carefree chemistry of Korea S.
Elastomerics used is:
Elastomerics 1: the ENGAGE8150 selecting LG-DOW company is ethylene-octene copolymer;
Elastomerics 2: the DF610 selecting Mitsui company is ethylene-butene copolymer;
Elastomerics 3: the ENGAGE 8200 selecting LG-DOW company is ethylene-octene copolymer.
Ultra-fine high silicon pharmaceutical grade talcum powder is specialty minerals company limited of U.S. pharmaceutical grade talcum powder, and its particle diameter is 2.5 μm, dioxide-containing silica 64%, whiteness 95, and loss on ignition is at 800 DEG C 1.5%.
Silicon-dioxide is:
Silica 1: Cabot white carbon black M-5;
Silicon-dioxide 2: Degussa AEROSIL380;
Anti-wear agent: DOW CORNING MB50-002 silicone master batch.
Lubricant is:
Lubricant 1:CRODA Crodamide ER (UNISLIP 1753) is amides lubricant;
Lubricant 2: Korea S Anlong chemistry EBS is amides lubricant;
Oxidation inhibitor is antioxidant 1010.
In following examples, the mass percent proportioning of each raw material is in table 1.
The raw material of table 1 polypropylene composite material and consumption (by mass percentage wt%)
Embodiment 1
The present embodiment is by each composition of raw materials of polypropylene composite material in table 1, and its preparation method carries out as follows:
Acrylic resin, elastomerics, silicon-dioxide, lubricant, silicone master batch, oxidation inhibitor and other additive are joined in high-speed mixer in proportion, after the mixing velocity of 1000r/min mixing 5min, again by twin screw extruder carry out melting, blended, extrude, the length-to-diameter ratio of twin screw extruder is 35:1, twin screw extruder processing temperature is followed successively by 170 DEG C, 180 DEG C, 190 DEG C, 190 DEG C, 190 DEG C, 200 DEG C, 200 DEG C, 200 DEG C, 200 DEG C, 200 DEG C, 210 DEG C from feed opening to die orifice, and vacuum tightness is 0.6MPa.
Through melting, blended, extrude after, then obtain described low coefficient of linear expansion, high winter hardiness, high-wearing feature polypropylene composite material after water cooling bracing, air-dry, pelletizing operation.
Embodiment 2
The present embodiment is by each composition of raw materials of polypropylene composite material in table 1, and its preparation process is with embodiment 1
Embodiment 3
The present embodiment is by each composition of raw materials of polypropylene composite material in table 1, and its preparation process is with embodiment 1
Embodiment 4
The present embodiment is by each composition of raw materials of polypropylene composite material in table 1, and its preparation process is with embodiment 1
Embodiment 5
The present embodiment is by each composition of raw materials of polypropylene composite material in table 1, and its preparation process is with embodiment 1
Embodiment 6
The present embodiment is by each composition of raw materials of polypropylene composite material in table 1, and its preparation process is with embodiment 1
Embodiment 7
The present embodiment is by each composition of raw materials of polypropylene composite material in table 1, and its preparation process is with embodiment 1
Comparative example 1
The present embodiment is by each composition of raw materials of polypropylene composite material in table 1, and its preparation process is with embodiment 1
Comparative example 2
The present embodiment is by each composition of raw materials of polypropylene composite material in table 1, and its preparation process is with embodiment 1
Comparative example 3
The present embodiment is by each composition of raw materials of polypropylene composite material in table 1, and its preparation process is with embodiment 1
Material the various embodiments described above and comparative example prepared carries out injection moulding and prepares test bars, and wherein testing method is;
Tensile strength: by ISO527 standard testing, speed is 50mm/min;
Flexural strength: by ISO178 standard testing, speed is 2mm/min;
Izod notched impact strength: by ISO 180 standard testing;
Coefficient of linear expansion (CLTE): by ISO 11359-2 standard testing, use thermomechanical analysis (TMA) test, probe temperature is-30 DEG C ~ 95 DEG C.
Glossiness testing method: by ASTM D2457 standard testing 60 ° of glossiness.
Wear resisting property is tested: by GB3960-1983 standard testing, experiment power is 200N, and rotating speed is 200r/min, and wearing-in period is 1h.
Test result is as shown in table 2, little compared with in comparative example of the horizontal flow direction (FD) of embodiment material and perpendicular flow direction (TD) coefficient of linear expansion and difference between the two, show that the dimensional stability of material improves, compare with comparative example, polypropylene in embodiment material, silicon-dioxide, the composite use of silicone master batch anti-wear agent and different lubricant, the abrasion loss considerably reduced, illustrative material wear resisting property significantly improve, simultaneously under-30 DEG C of conditions the Chalpy impact of embodiment also higher than comparative example, the cold tolerance of illustrative material improves.
Thus by the coefficient of linear expansion of each embodiment and comparative example, wear resisting property and low-temperature impact result can draw, the present invention passes through dissimilar acrylic resin, elastomerics, silicon-dioxide, lubricant, silicone master batch, oxidation inhibitor and other additive, composite use, the low coefficient of linear expansion of polypropylene composite material is prepared under overcoming prior art, high abrasion, the feature that high winter hardiness can not possess simultaneously, expand range of application and the field of polypropylene composite material material, especially at thermos cup internal layer bowl cover moulding, household appliance appearance part and automotive upholstery etc. these above-mentioned performance is had to the field of requirement.
The performance test results of each embodiment polypropylene composite material of table 2
Claims (10)
1. a polypropylene composite material, is characterized in that each raw material by the proportioning of mass percent is:
Acrylic resin 40%-80%;
Elastomerics 5%-15%;
Silicon-dioxide 5-30%;
Mineral filler 5-30%;
Anti-wear agent 1%-10%;
Lubricant 0.1%-2%;
Other additives 0.1%-5%;
Described silicon-dioxide is the medicinal silicon-dioxide of micron order, and mineral filler is ultra-fine high silicon pharmaceutical grade talcum powder.
2. polypropylene composite material according to claim 1, is characterized in that:
Described acrylic resin is mixtures of one or several compositions in homo-polypropylene resin and acrylic resin copolymer, the melt mass flow rate of described acrylic resin is 2-80g/10min under the test condition of temperature 230 DEG C, load weight 2.16Kg, the Izod notched impact strength>=1KJ/m of described homo-polypropylene resin 23 DEG C time
2, the Izod notched impact strength>=5KJ/m of described acrylic resin copolymer 23 DEG C time
2.
3. polypropylene composite material according to claim 1, it is characterized in that: described elastomerics is alpha olefin copolymer, described alpha olefin copolymer is the mixture of one or more in ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-hexene co-polymers and ethylene-octene copolymer;
Described elastomerics density is 0.850-0.940g/cm
3, described elastomeric melt mass flow rate is 0.1-40g/10min under the test condition of temperature 190 DEG C, load weight 2.16Kg.
4. polypropylene composite material according to claim 1, is characterized in that: described anti-wear agent is the mixture of one or more of silicone master batch, silicone powder and tetrafluoroethylene.
5. polypropylene composite material according to claim 1, is characterized in that: described lubricant is the mixture of one or more in amides lubricant, metal soap lubricant and oxidized polyethlene wax series lubricant agent.
6. polypropylene composite material according to claim 1, is characterized in that: described silicon-dioxide is the medicinal white carbon black of micron order.
7. polypropylene composite material according to claim 1, is characterized in that: the talcous particle diameter of described ultra-fine high silicon pharmaceutical grade is 0.1-3 μm, dioxide-containing silica >=65%, whiteness >=95 and loss on ignition at 800 DEG C≤3%.
8. polypropylene composite material according to claim 1, is characterized in that: other additives described are oxidation inhibitor, nucleator, compatilizer and/or pigment.
9. the preparation method of the polypropylene composite material in a claim 1-8 described in any one, it is characterized in that comprising following steps: acrylic resin, elastomerics, silicon-dioxide, mineral filler, anti-wear agent, lubricant and other additives are joined in high-speed mixer in proportion, after the mixing velocity of 1000r/min mixing 5min, by twin screw extruder carry out melting, blended, extrude, again after water cooling bracing, air-dry, pelletizing operation, obtain polypropylene composite material; The length-to-diameter ratio of described twin screw extruder is 65-20:1, and twin screw extruder processing temperature is 170-250 DEG C, and vacuum tightness is 0.4-0.8MPa.
10. the application of polypropylene composite material described in any one in injection moulding thermos cup internal layer bowl cover moulding, injection moulding appliances parts and injection molded automobile product in a claim 1-8.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105440307A (en) * | 2015-12-11 | 2016-03-30 | 天津金发新材料有限公司 | Lubricant and mica-filled polypropylene compound with lubricant |
| CN105504485A (en) * | 2015-12-04 | 2016-04-20 | 太仓苏晟电气技术科技有限公司 | Drum type peeling machine |
| CN108164827A (en) * | 2018-01-18 | 2018-06-15 | 珠海市金塑塑料有限公司 | It is a kind of for PP/SBS alloy materials of liquid crystal TV set middle frame support and preparation method thereof |
| CN108641375A (en) * | 2018-04-29 | 2018-10-12 | 徐菡 | Wear-resisting PP plastics of a kind of high flowing and preparation method thereof |
| CN108794897A (en) * | 2018-05-30 | 2018-11-13 | 上海交通大学 | A kind of polypropylene-base high-voltage cable insulating layer material and preparation method thereof |
| CN109096607A (en) * | 2018-07-17 | 2018-12-28 | 江苏兆维塑料科技有限公司 | A kind of polypropylene material and preparation method thereof with anti scuffing pressure mottling resistance energy |
| CN109535552A (en) * | 2018-11-07 | 2019-03-29 | 盘锦海兴科技股份有限公司 | A kind of novel wear resistant high impact copolymer composite material and preparation method |
| CN109666219A (en) * | 2018-12-14 | 2019-04-23 | 万华化学集团股份有限公司 | Polypropylene/shear thickening gel complex material and its application in bumper |
| CN110066455A (en) * | 2018-01-23 | 2019-07-30 | 合肥杰事杰新材料股份有限公司 | A kind of abrasion performance antistatic polypropylene material and preparation method thereof |
| CN110218394A (en) * | 2019-05-24 | 2019-09-10 | 骆驼集团塑胶制品有限公司 | A kind of electrolyte resistance polypropylene modified material of low temperature ultra-toughness and preparation method thereof |
| WO2021057355A1 (en) * | 2019-09-26 | 2021-04-01 | 金发科技股份有限公司 | Polypropylene composite material with low shrinkage and low linear expansion coefficient, and preparation method |
| CN114213763A (en) * | 2021-11-30 | 2022-03-22 | 天津金发新材料有限公司 | Modified polypropylene composite material and preparation method and application thereof |
| CN115232405A (en) * | 2022-09-13 | 2022-10-25 | 广东安拓普聚合物科技有限公司 | Cold-resistant elastomer material and preparation method thereof |
| CN115584084A (en) * | 2022-02-23 | 2023-01-10 | 江苏永顺新材料科技有限公司 | High-hardness material for paint bucket |
| EP3665224B1 (en) | 2017-08-08 | 2023-03-15 | SABIC Global Technologies B.V. | Composition comprising heterophasic propylene copolymer |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105504485A (en) * | 2015-12-04 | 2016-04-20 | 太仓苏晟电气技术科技有限公司 | Drum type peeling machine |
| CN105440307A (en) * | 2015-12-11 | 2016-03-30 | 天津金发新材料有限公司 | Lubricant and mica-filled polypropylene compound with lubricant |
| CN105440307B (en) * | 2015-12-11 | 2018-05-29 | 天津金发新材料有限公司 | A kind of lubricant and the cloud model controller compound using this kind of lubricant |
| EP3665224B1 (en) | 2017-08-08 | 2023-03-15 | SABIC Global Technologies B.V. | Composition comprising heterophasic propylene copolymer |
| CN108164827A (en) * | 2018-01-18 | 2018-06-15 | 珠海市金塑塑料有限公司 | It is a kind of for PP/SBS alloy materials of liquid crystal TV set middle frame support and preparation method thereof |
| CN110066455B (en) * | 2018-01-23 | 2022-04-05 | 合肥杰事杰新材料股份有限公司 | Abrasion-resistant antistatic polypropylene material and preparation method thereof |
| CN110066455A (en) * | 2018-01-23 | 2019-07-30 | 合肥杰事杰新材料股份有限公司 | A kind of abrasion performance antistatic polypropylene material and preparation method thereof |
| CN108641375A (en) * | 2018-04-29 | 2018-10-12 | 徐菡 | Wear-resisting PP plastics of a kind of high flowing and preparation method thereof |
| CN108794897A (en) * | 2018-05-30 | 2018-11-13 | 上海交通大学 | A kind of polypropylene-base high-voltage cable insulating layer material and preparation method thereof |
| CN109096607A (en) * | 2018-07-17 | 2018-12-28 | 江苏兆维塑料科技有限公司 | A kind of polypropylene material and preparation method thereof with anti scuffing pressure mottling resistance energy |
| CN109535552B (en) * | 2018-11-07 | 2021-06-08 | 盘锦海兴科技股份有限公司 | Wear-resistant impact-resistant polypropylene composite material and preparation method thereof |
| CN109535552A (en) * | 2018-11-07 | 2019-03-29 | 盘锦海兴科技股份有限公司 | A kind of novel wear resistant high impact copolymer composite material and preparation method |
| CN109666219A (en) * | 2018-12-14 | 2019-04-23 | 万华化学集团股份有限公司 | Polypropylene/shear thickening gel complex material and its application in bumper |
| CN110218394A (en) * | 2019-05-24 | 2019-09-10 | 骆驼集团塑胶制品有限公司 | A kind of electrolyte resistance polypropylene modified material of low temperature ultra-toughness and preparation method thereof |
| WO2021057355A1 (en) * | 2019-09-26 | 2021-04-01 | 金发科技股份有限公司 | Polypropylene composite material with low shrinkage and low linear expansion coefficient, and preparation method |
| CN114213763A (en) * | 2021-11-30 | 2022-03-22 | 天津金发新材料有限公司 | Modified polypropylene composite material and preparation method and application thereof |
| CN114213763B (en) * | 2021-11-30 | 2023-05-05 | 天津金发新材料有限公司 | Modified polypropylene composite material and preparation method and application thereof |
| CN115584084A (en) * | 2022-02-23 | 2023-01-10 | 江苏永顺新材料科技有限公司 | High-hardness material for paint bucket |
| CN115232405A (en) * | 2022-09-13 | 2022-10-25 | 广东安拓普聚合物科技有限公司 | Cold-resistant elastomer material and preparation method thereof |
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Application publication date: 20150902 |