CN105367903A - Multielement-blended PP used for lithium batteries, and preparation method thereof - Google Patents
Multielement-blended PP used for lithium batteries, and preparation method thereof Download PDFInfo
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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
- C08L23/12—Polypropene
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a multielement-blended PP used for lithium batteries, and a preparation method thereof. The multielement-blended PP comprises following raw materials, PP, anti-oxidant 1010, ultraviolet ray absorber UV-531, SBS, HDPE, anti-oxidant DLTP, polyethylene, a silane coupling agent, POE, and talcum powder. Product bending strength ranges from 45 to 65MPa, tensile strength ranges from 40 to 60MPa, Izod impact strength ranges from 10 to 30kJ/m<2>, elongation at break ranges from 200 to 250%, and heat distortion temperature ranges from 110 to 150 DEG C.
Description
Technical field
The present invention relates to plastics arts, particularly relate to a kind of lithium cell poly-blended PP and preparation method thereof.
Background technology
Lithium cell is broadly divided into two classes: lithium metal battery and lithium ion battery.The lithium of lithium ion battery not containing metallic state, and can charge.Rechargeable cell the 5th generation product lithium metal battery 1996 be born, its security, specific storage, self-discharge rate and the ratio of performance to price are all better than lithium ion battery.Because the hi-tech of himself requires restriction, only has now the company of a few countries at this lithium metal battery of production.
Lithium cell very early time is applied in schrittmacher.The self-discharge rate of lithium cell is extremely low, the advantages such as sparking voltage is mild, makes the pacemaker of implant into body can long-term operation and need not again charging.Lithium cell generally has the rated voltage higher than 3.0 volts, is more suitable for making ic power.Manganese dioxide battery, is just widely used in counter, in digital camera, wrist-watch.Along with digital product widely using as the product such as mobile phone, notebook computer, lithium ion battery is used widely in this series products with the performance of excellence, and is progressively developing to other product applications.1998, Tianjin power supply institute started to commercially produce lithium ion battery.Traditionally, people are lithium ion battery also referred to as lithium cell, but these two kinds of batteries are different.Lithium ion battery becomes main flow.
Polypropylene (PP) is one lighter in common plastics, its excellent electrical property, can be used as wet-heat resisting high-frequency insulation materials application.PP belongs to crystalline polymer, during melt condensation because of specific volume change greatly, degree of molecular orientation is high and present shrinking percentage (1.0%-1.5%) greatly.In the molten state, the effect reducing its viscosity with heating up is little for PP.Therefore in molding process, should to improve injection pressure and shearing rate, to improve the Forming Quality of goods.
Compatilizer technology and reactively blending technology is adopted to carry out to PP the principal feature that blending and modifying is the development of current PP blending and modifying.It can ensure to increase substantially PP shock-resistance under intermingling material has the prerequisite of certain tensile strength and flexural strength.Compatilizer can improve two-phase interface and cohere situation in co-mixing system, is conducive to realizing the stable of microcosmic heterogeneous system, and is macroscopically uniform structural state.Response type compatilizer, except having effect of general compatilizer, can also produce molecule link between the two phases, significantly improve intermingling material performance in Blending Processes.
PP, is commonly called as: polypropylene (PP).Polypropylene is the representative of poly-alpha olefins, a kind of thermoplastic resin obtained by propylene polymerization, and monomer whose is propylene CH2=CH-CH3.According to the difference of initiator and polymerization technique, polypropylene can be divided into isotatic polypropylene and Atactic Polypropelene and syndiotactic polypropylene three kinds of configurations.Isotatic polypropylene easily forms crystal form, and degree of crystallinity is up to more than 95%, and molecular weight, between 8-15 ten thousand, gives its good heat resistanceheat resistant and good solubility-resistence; Atactic Polypropelene is at room temperature a kind of amorphous, micro-adhesive White waxy thing, and molecular weight is low, and at 3000-10000, structure irregularity lacks force of cohesion, applies less.
The polyacrylic industrial production of China starts from 20 century 70s, through the development of more than 30 years, generally define the multiple production technique such as solvent method, liquid-phase bulk-vapor phase process, batch liquid bulk polymerization, vapor phase process to develop simultaneously, the production pattern that large, medium and small industrial scale coexists.The large-scale polypropylene production apparatus of China is to introduce technology, and medium-sized and small-sized polypropylene production apparatus is based on domestic technology.
China's polypropylene output in several years in the future has larger growth, but production still needs for not enough, and China has become global maximum polypropylene net importer.But because output in domestic increases very soon, importation dependence is on a declining curve generally.In China polypropylene coming years, Apparent con-sumption still can keep higher speedup, and import volume will increase, polypropylene industry having a extensive future in China.
Summary of the invention
The invention provides that a kind of tensile strength is high, Young's modulus is high, shock strength is high and lithium cell poly-blended PP and preparation method thereof that elongation at break is high, solve the technical problems such as the low and flexural strength of current material tensile strength is low.
The present invention is by the following technical solutions: the poly-blended PP of a kind of lithium cell, it is as follows that mass fraction proportioning pressed by its raw material: PP100 part, antioxidant 1010 is 0.1-0.5 part, and ultraviolet absorbent UV-531 is 0.4-0.8 part, SBS3-7 part, HDPE6-10 part, anti-oxidant DLTP 0.2-0.6 part, polyethylene 10-30 part, silane coupling agent 5-25 part, POE10-30 part, talcum powder 20-40 part.
As a preferred technical solution of the present invention: it is as follows that described lithium cell presses mass fraction proportioning with the raw material of poly-blended PP: PP100 part, antioxidant 1010 is 0.2 part, ultraviolet absorbent UV-531 is 0.5 part, SBS4 part, HDPE7 part, anti-oxidant DLTP 0.3 part, polyethylene 15 parts, silane coupling agent 10 parts, POE15 part, talcum powder 25 parts.
As a preferred technical solution of the present invention: it is as follows that described lithium cell presses mass fraction proportioning with the raw material of poly-blended PP: PP100 part, antioxidant 1010 is 0.4 part, ultraviolet absorbent UV-531 is 0.7 part, SBS6 part, HDPE9 part, anti-oxidant DLTP 0.5 part, polyethylene 25 parts, silane coupling agent 20 parts, POE25 part, talcum powder 35 parts.
As a preferred technical solution of the present invention: it is as follows that described lithium cell presses mass fraction proportioning with the raw material of poly-blended PP: PP100 part, antioxidant 1010 is 0.3 part, ultraviolet absorbent UV-531 is 0.6 part, SBS5 part, HDPE8 part, anti-oxidant DLTP 0.4 part, polyethylene 20 parts, silane coupling agent 15 parts, POE20 part, talcum powder 30 parts.
Prepare the method for described lithium cell with poly-blended PP, step is:
The first step: according to mass fraction proportioning take PP, antioxidant 1010 for, ultraviolet absorbent UV-531 for, SBS, HDPE, anti-oxidant DLTP, polyethylene, silane coupling agent, POE and talcum powder;
Second step: silane coupling agent, PP and HDPE are reacted 10-30min at 80-100 DEG C, adds SBS, antioxidant 1010 and anti-oxidant DLTP, at 90-100 DEG C, with 100-300r/min speed mixing 5-25min;
3rd step: add polyethylene, POE, talcum powder and surplus stock, mix in rear input forcing machine and extrude, four sections of control temperature are divided from feed end to head, be followed successively by 100-120 DEG C, 160-180 DEG C, 210-230 DEG C, 220-240 DEG C, adopt injection molding, molding technique parameter is material temperature 180-220 DEG C, core temperature 15-25 DEG C, injection pressure 98-100MPa, the production cycle is 3-5min.
beneficial effect
A kind of lithium cell of the present invention poly-blended PP and preparation method thereof adopts above technical scheme compared with prior art, has following technique effect: 1, product flexural strength 45-65MPa, tensile strength 40-60MPa; 2, cantilever beam impact strength 10-30kJ/m
2, elongation at break 200-250%; 3, heat-drawn wire 110-150 DEG C, preparation method is simple, and raw material is simple and easy to get, the widespread production not division of history into periods can replace current material.
Embodiment
Below in conjunction with example, the invention will be further described, and embodiment, only for the present invention will be described, does not form the restriction to right, and other alternative means that it may occur to persons skilled in the art that, all within the scope of the claims in the present invention.
Embodiment 1:
The first step: take PP100 part according to mass fraction proportioning, antioxidant 1010 is 0.1 part, and ultraviolet absorbent UV-531 is 0.4 part, SBS3 part, HDPE6 part, anti-oxidant DLTP 0.2 part, polyethylene 10 parts, silane coupling agent 5 parts, POE10 part, talcum powder 20 parts.
Second step: silane coupling agent, PP and HDPE are reacted 10min at 80 DEG C, adds SBS, antioxidant 1010 and anti-oxidant DLTP, at 90 DEG C, with 100r/min speed mixing 5min.
3rd step: add polyethylene, POE, talcum powder and surplus stock, mix in rear input forcing machine and extrude, four sections of control temperature are divided from feed end to head, be followed successively by 100 DEG C, 160 DEG C, 210 DEG C, 220 DEG C, adopt injection molding, molding technique parameter is material temperature 180 DEG C, core temperature 15 DEG C, injection pressure 98MPa, the production cycle is 3min.
Product flexural strength 45MPa, tensile strength 40MPa; Cantilever beam impact strength 10kJ/m
2, elongation at break 200%, heat-drawn wire 110 DEG C.
Embodiment 2:
The first step: take PP100 part according to mass fraction proportioning, antioxidant 1010 is 0.5 part, and ultraviolet absorbent UV-531 is 0.8 part, SBS7 part, HDPE10 part, anti-oxidant DLTP 0.6 part, polyethylene 30 parts, silane coupling agent 25 parts, POE30 part, talcum powder 40 parts.
Second step: silane coupling agent, PP and HDPE are reacted 30min at 100 DEG C, adds SBS, antioxidant 1010 and anti-oxidant DLTP, at 100 DEG C, with 300r/min speed mixing 25min.
3rd step: add polyethylene, POE, talcum powder and surplus stock, mix in rear input forcing machine and extrude, four sections of control temperature are divided from feed end to head, be followed successively by 120 DEG C, 180 DEG C, 230 DEG C, 240 DEG C, adopt injection molding, molding technique parameter is material temperature 220 DEG C, core temperature 25 DEG C, injection pressure 100MPa, the production cycle is 5min.
Product flexural strength 50MPa, tensile strength 45MPa; Cantilever beam impact strength 15kJ/m
2, elongation at break 210%, heat-drawn wire 120 DEG C.
Embodiment 3:
The first step: take PP100 part according to mass fraction proportioning, antioxidant 1010 is 0.2 part, and ultraviolet absorbent UV-531 is 0.5 part, SBS4 part, HDPE7 part, anti-oxidant DLTP 0.3 part, polyethylene 15 parts, silane coupling agent 10 parts, POE15 part, talcum powder 25 parts.
Second step: silane coupling agent, PP and HDPE are reacted 10min at 80 DEG C, adds SBS, antioxidant 1010 and anti-oxidant DLTP, at 90 DEG C, with 100r/min speed mixing 5min.
3rd step: add polyethylene, POE, talcum powder and surplus stock, mix in rear input forcing machine and extrude, four sections of control temperature are divided from feed end to head, be followed successively by 100 DEG C, 160 DEG C, 210 DEG C, 220 DEG C, adopt injection molding, molding technique parameter is material temperature 180 DEG C, core temperature 15 DEG C, injection pressure 98MPa, the production cycle is 3min.
Product flexural strength 55MPa, tensile strength 50MPa; Cantilever beam impact strength 20kJ/m
2, elongation at break 225%, heat-drawn wire 130 DEG C.
Embodiment 4:
The first step: take PP100 part according to mass fraction proportioning, antioxidant 1010 is 0.4 part, and ultraviolet absorbent UV-531 is 0.7 part, SBS6 part, HDPE9 part, anti-oxidant DLTP 0.5 part, polyethylene 25 parts, silane coupling agent 20 parts, POE25 part, talcum powder 35 parts.
Second step: silane coupling agent, PP and HDPE are reacted 30min at 100 DEG C, adds SBS, antioxidant 1010 and anti-oxidant DLTP, at 100 DEG C, with 300r/min speed mixing 25min.
3rd step: add polyethylene, POE, talcum powder and surplus stock, mix in rear input forcing machine and extrude, four sections of control temperature are divided from feed end to head, be followed successively by 120 DEG C, 180 DEG C, 230 DEG C, 240 DEG C, adopt injection molding, molding technique parameter is material temperature 220 DEG C, core temperature 25 DEG C, injection pressure 100MPa, the production cycle is 5min.
Product flexural strength 60MPa, tensile strength 55MPa; Cantilever beam impact strength 25kJ/m
2, elongation at break 240%, heat-drawn wire 140 DEG C.
Embodiment 5:
The first step: take PP100 part according to mass fraction proportioning, antioxidant 1010 is 0.3 part, and ultraviolet absorbent UV-531 is 0.6 part, SBS5 part, HDPE8 part, anti-oxidant DLTP 0.4 part, polyethylene 20 parts, silane coupling agent 15 parts, POE20 part, talcum powder 30 parts.
Second step: silane coupling agent, PP and HDPE are reacted 20min at 90 DEG C, adds SBS, antioxidant 1010 and anti-oxidant DLTP, at 95 DEG C, with 200r/min speed mixing 15min.
3rd step: add polyethylene, POE, talcum powder and surplus stock, mix in rear input forcing machine and extrude, four sections of control temperature are divided from feed end to head, be followed successively by 110 DEG C, 170 DEG C, 220 DEG C, 230 DEG C, adopt injection molding, molding technique parameter is material temperature 200 DEG C, core temperature 20 DEG C, injection pressure 99MPa, the production cycle is 4min.
Product flexural strength 65MPa, tensile strength 60MPa; Cantilever beam impact strength 30kJ/m
2, elongation at break 250%, heat-drawn wire 150 DEG C.
Claims (5)
1. the poly-blended PP of lithium cell, it is characterized in that, it is as follows that described lithium cell presses mass fraction proportioning with the raw material of poly-blended PP: PP100 part, and antioxidant 1010 is 0.1-0.5 part, ultraviolet absorbent UV-531 is 0.4-0.8 part, SBS3-7 part, HDPE6-10 part, anti-oxidant DLTP 0.2-0.6 part, polyethylene 10-30 part, silane coupling agent 5-25 part, POE10-30 part, talcum powder 20-40 part.
2. the poly-blended PP of a kind of lithium cell according to claim 1, it is characterized in that, it is as follows that described lithium cell presses mass fraction proportioning with the raw material of poly-blended PP: PP100 part, and antioxidant 1010 is 0.2 part, ultraviolet absorbent UV-531 is 0.5 part, SBS4 part, HDPE7 part, anti-oxidant DLTP 0.3 part, polyethylene 15 parts, silane coupling agent 10 parts, POE15 part, talcum powder 25 parts.
3. the poly-blended PP of a kind of lithium cell according to claim 1, it is characterized in that, it is as follows that described lithium cell presses mass fraction proportioning with the raw material of poly-blended PP: PP100 part, and antioxidant 1010 is 0.4 part, ultraviolet absorbent UV-531 is 0.7 part, SBS6 part, HDPE9 part, anti-oxidant DLTP 0.5 part, polyethylene 25 parts, silane coupling agent 20 parts, POE25 part, talcum powder 35 parts.
4. the poly-blended PP of a kind of lithium cell according to claim 1, it is characterized in that: the raw material of the poly-blended PP of described lithium cell is as follows by mass fraction proportioning: PP100 part, antioxidant 1010 is 0.3 part, and ultraviolet absorbent UV-531 is 0.6 part, SBS5 part, HDPE8 part, anti-oxidant DLTP 0.4 part, polyethylene 20 parts, silane coupling agent 15 parts, POE20 part, talcum powder 30 parts.
5. make a lithium cell according to claim 1 method of poly-blended PP, it is characterized in that, comprise the steps:
The first step: take PP, antioxidant 1010, ultraviolet absorbent UV-531, SBS, HDPE, anti-oxidant DLTP, polyethylene, silane coupling agent, POE and talcum powder according to mass fraction proportioning;
Second step: silane coupling agent, PP and HDPE are reacted 10-30min at 80-100 DEG C, adds SBS, antioxidant 1010 and anti-oxidant DLTP, at 90-100 DEG C, with 100-300r/min speed mixing 5-25min;
3rd step: add polyethylene, POE, talcum powder and surplus stock, mix in rear input forcing machine and extrude, four sections of control temperature are divided from feed end to head, be followed successively by 100-120 DEG C, 160-180 DEG C, 210-230 DEG C, 220-240 DEG C, adopt injection molding, molding technique parameter is material temperature 180-220 DEG C, core temperature 15-25 DEG C, injection pressure 98-100MPa, the production cycle is 3-5min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510899497.XA CN105367903A (en) | 2015-12-09 | 2015-12-09 | Multielement-blended PP used for lithium batteries, and preparation method thereof |
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| CN201510899497.XA CN105367903A (en) | 2015-12-09 | 2015-12-09 | Multielement-blended PP used for lithium batteries, and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106496801A (en) * | 2016-10-21 | 2017-03-15 | 珠海格力电器股份有限公司 | Preparation method of polypropylene composite material and polypropylene composite material prepared by same |
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| CN104292626A (en) * | 2014-09-26 | 2015-01-21 | 苏州博利迈新材料科技有限公司 | Modified PP automobile wheel casing and preparation method thereof |
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| CN104292626A (en) * | 2014-09-26 | 2015-01-21 | 苏州博利迈新材料科技有限公司 | Modified PP automobile wheel casing and preparation method thereof |
| CN104861292A (en) * | 2015-05-12 | 2015-08-26 | 苏州市德莱尔建材科技有限公司 | Computer rear housing material and manufacturing method thereof |
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| 叶林忠 等: "滑石粉填充PP/HDPE/SBS体系的性能研究", 《塑料》 * |
| 谢邦互 等: "聚丙烯 POE 共混组成对材料断裂行为的影响", 《高分子学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106496801A (en) * | 2016-10-21 | 2017-03-15 | 珠海格力电器股份有限公司 | Preparation method of polypropylene composite material and polypropylene composite material prepared by same |
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Application publication date: 20160302 |