CN105647012A - PP and PET alloy and preparation method thereof - Google Patents

PP and PET alloy and preparation method thereof Download PDF

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Publication number
CN105647012A
CN105647012A CN201610131222.6A CN201610131222A CN105647012A CN 105647012 A CN105647012 A CN 105647012A CN 201610131222 A CN201610131222 A CN 201610131222A CN 105647012 A CN105647012 A CN 105647012A
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China
Prior art keywords
pet alloy
alloy
pet
sodium benzoate
raw materials
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CN201610131222.6A
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Inventor
刘莉
王爽
邱晶
刘晓东
黄明明
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Suzhou Netshape Composite Materials Co Ltd
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Suzhou Netshape Composite Materials Co Ltd
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Priority to CN201610131222.6A priority Critical patent/CN105647012A/en
Publication of CN105647012A publication Critical patent/CN105647012A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • 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
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The invention discloses a PP and PET alloy and a preparation method thereof. PP, PET, SBS, EPDM, PS, SEP, sodium benzoate, DCP, HDPE, PA11 and ACR are weighed according to a weight part ratio. Tensile strength of the PP and PET alloy is 40-80 MPa, and impact strength is 100-140 kJ/m2; Vicat softening point of the PP and PET alloy is 140-160 DEG C, and burning speed is 2-6 mm/min; the PP and PET alloy is high in strength, bending strength is 60-80 MPa, elastic modulus is 800-1000 MPa, and elongation at break is 8-12%.

Description

A kind of PP and PET alloy and preparation method thereof
Technical field
The application belongs to plastic alloy material field, particularly relates to a kind of PP and PET alloy and preparation method thereof.
Background technology
Plastic alloy be utilize the method for physical blending or chemical graft and obtain high-performance, functionalization, customizations a class new material. Plastic alloy product can be widely used for the fields such as automobile, electronics, precision instrument, office equipment, packaging material, construction material. It can improve or improve the performance of existing plastics and reduce cost, it has also become one of kind the most active in plastics industry, increases very rapid. China's plastic industry to be got a clear understanding of the situation, and finds gap accurately, seizes the opportunity, and strengthens input in science and technology, accelerates development Plastics Industry, world development level of emulating.
General-purpose plastics alloy, as although polrvinyl chloride, polyethylene, polypropylene, polystyrene alloy still have use value widely, but because its production technology is generally grasped, so abroad, mostly what each major company supplied specially is the engineering plastic alloy kind that added value is higher. Engineering plastic alloy refers to the blend of engineering plastics (resin), mainly includes based on the co-mixing system of the engineering plastics such as PET, PA, polyformaldehyde, SBSO, politef.
Carbonic ester and acrylonitrile-butadiene-styrene copolymer and mixture, it is by the thermoplastic plastic rubber of Merlon and polyacrylonitrile alloy, combine the excellent specific property of bi-material, the mechanicalness of PET, impact strength and the character such as heatproof, uvioresistant (UV), can be widely used on automotive interior parts, business machine, the communication apparatus, electrical home appliances and luminaire.
The maximum user of current world plastic alloy product is automobile component, next to that both mechanically and electrically components and parts. From Japan major project plastic alloy demand structure it can be seen that automotive plastic alloy accounts for 62%, electric and business automation equipment accounts for 20%, and general precision optical machinery accounts for 6%, medical treatment, physical culture and other account for 12%. From area, current North America is maximum plastic alloy consumption area, accounts for 45%; Next to that European, account for 34%; The Asia-pacific region accounts for 21%. In North America, polyphenylene oxide alloy accounts for more than the 25% of plastic alloy total demand, wherein having the call with SBSO/PA, SBSO/ polyethylene terephthalate and SBSO/ polybutylene terephthalate (PBT) alloy especially; Polycarbonate alloy accounts for more than the 12% of aggregate demand; Alloy for automobile final use accounts for 99%.
China is to the research of plastic alloy from the sixties in 20th century, and development is very fast in recent years.According to statistics, current China plastic alloy (containing modified resin) total quantity consumed is about 1,200,000��1,400,000 tons, and domestic supply amount is less than 600,000 tons, and annual import volume is up to about 900,000 tons; And China's plastic alloy (mainly blending resin and modified resin) is mainly used in household electrical appliances, electronics, automobile and other industries, compared with developed countries, the plastic alloy application market of China also has very big expanding space.
Along with China's sustained and rapid development of economy, a few years from now on China plastic alloy market demand potential is huge, especially the rapid growth of telecommunications, automobile, building industry, pulls on China's engineering plastic alloy industry fast-developing. Expecting 2008, China five large-engineering plastics aggregate demand is up to 1,000,000 tons, and the demand of five big synthetic resin is up to 52,000,000 tons, will become one of maximum importer of whole world plastic alloy.
Current China modified plastics year aggregate demand is about about 5,000,000 tons, accounts for about the 10% of whole plastics overall consumption, and its ratio is well below the average level in the world. China's plastics consumption figure per capita there is also very big gap compared with World Developed Countries. Wanting the fast steady development realizing China's modified plastic industry, innovative technology is the key point of future development. Chemical industry analyst think, the current overall development level of China's modified plastic industry is not as high, the production scale of enterprise inside the circle is general less, the primary product that product market goes out are many, middle rank product quality is not sufficiently stable, the feature that high-grade products lack, far from the needs meeting China's current social economic development. As an important component part in new chemical materials field, modified plastics has been classified as one of sciemtifec and technical sphere of giving priority to by country. Release successively modified plastic industry will be promoted further to develop from the every policy of China. Automobile and household electric appliances are the focuses of modified plastics development, and both accountings are about more than 50%.
PET mainly takes injection moulding to process, and additive method also has the secondary processing method such as extrusion, blowing, coating and welding, sealing-in, machining, vacuum coating. Must be fully dry before molding. Main application has for electronic apparatus aspect: electrical outlets, electric power connector, electric cooker handle, TV deflection yoke, terminal board, circuit breaker shell, switch, motor fan shell, instrument machine components, paper money counter part, electric iron, electromagnetic stove oven accessory; Flow control valve in auto industry, carburetor cover, vehicle window controller, foot operated speed changer, distribution board cover; Mechanical industry gear, blade, belt pulley, pump component, other also wheelchair car body and wheel, lampshade shell, illuminator enclosure, drain connection, slide fastener, clock and watch part etc.
At present, China's plastic alloy research and production two aspects, all also in fragmentary scattered state, not yet form scale, and industry integral level is low, differs greatly with Foreign Advanced Lerel. In Plastics in China alloy production breed structure, the production of the special engineering plastics alloy of high added value is nearly at blank, is substantially the production of general-purpose plastics alloy and modified product. Existing 300 Duo Jia plastic alloy manufacturing enterprises of China in 2004, estimate that plastic alloy (containing modified pellet) production capacity is 700,000��800,000 tons/year, and yield is at about 600,000 tons/year. But wherein larger enterprise only accounts for 15%, and this enterprise production of 15% accounts for more than the 70% of whole nation plastic alloy total output. Enterprise's major part is to be produced the Processing Firm of plastic alloy by plastic milling expressing technique. China's plastic alloy research and development and processing technique level have much room for improvement. And popularizing along with humanity concept, and the composition of novel harmonious society, design a kind of intensity PP high, impact-resistant and PET alloy and preparation method thereof are very important.
Summary of the invention
Solve the technical problem that:
The application is for above-mentioned technical problem, it is provided that a kind of PP and PET alloy and preparation method thereof, solves the technical problems such as existing plastic alloy material hot strength is low, impact strength is low, heat resisting temperature is low.
Technical scheme:
A kind of PP and PET alloy, the raw materials by weight portion proportioning of described PP and PET alloy is as follows: PP100 part; PET50-90 part; SBS5-25 part; EPDM1-5 part; PS20-40 part; SEP5-25 part; Sodium benzoate 0.2-0.6 part; DCP0.5-2.5 part; HDPE30-50 part; PA11 is 1-20 part; ACR2-6 part.
As a preferred technical solution of the present invention: the raw materials by weight portion proportioning of described PP and PET alloy is as follows: PP100 part; PET60-80 part; SBS10-20 part; EPDM2-4 part; PS25-35 part; SEP10-20 part; Sodium benzoate 0.3-0.5 part; DCP1-2 part; HDPE35-45 part; PA11 is 5-15 part; ACR3-5 part.
As a preferred technical solution of the present invention: the raw materials by weight portion proportioning of described PP and PET alloy is as follows: PP100 part; PET60 part; SBS10 part; EPDM2 part; PS25 part; SEP10 part; Sodium benzoate 0.3 part; DCP1 part; HDPE35 part; PA11 is 5 parts; ACR3 part.
As a preferred technical solution of the present invention: the raw materials by weight portion proportioning of described PP and PET alloy is as follows: PP100 part; PET80 part; SBS20 part; EPDM4 part; PS35 part; SEP20 part; Sodium benzoate 0.5 part; DCP2 part; HDPE45 part; PA11 is 15 parts; ACR5 part.
As a preferred technical solution of the present invention: the raw materials by weight portion proportioning of described PP and PET alloy is as follows: PP100 part; PET70 part; SBS15 part; EPDM3 part; PS30 part; SEP15 part; Sodium benzoate 0.4 part; DCP1.5 part; HDPE40 part; PA11 is 10 parts; ACR4 part.
As a preferred technical solution of the present invention: the preparation method of described PP and PET alloy, comprise the steps:
The first step: weigh PP, PET, SBS, EPDM, PS, SEP, sodium benzoate, DCP, HDPE, PA11 and ACR according to parts by weight proportioning;
Second step: raw material putting into blender mixing, is warming up to 80-100 DEG C, mixing velocity is 100-120r/min, mixes 6-10h;
3rd step: put into double screw extruder after mix homogeneously, barrel temperature 170-180 DEG C, 175-185 DEG C, 180-190 DEG C, 185-195 DEG C, 190-200 DEG C, extruder temperature 190-200 DEG C, head temperature 190-200 DEG C, 195-205 DEG C, 200-210 DEG C, 205-215 DEG C, 210-220 DEG C, screw speed 18-22r/min, feed intake rotating speed 30-40r/min.
Beneficial effect:
A kind of PP and PET alloy and preparation method thereof of the present invention adopt above technical scheme compared with prior art, have following technical effect that 1, product hot strength 40-80MPa, impact strength 100-140kJ/m2; 2, product Vicat softening point 140-160 DEG C, burning velocity 2-6mm/min; 3, product strength is high, bending strength 60-80MPa, elastic modelling quantity 800-1000MPa; 4, elongation at break 8-12%, with low cost, simple to operate, it is possible to current material is replaced in the widespread production not division of history into periods.
Detailed description of the invention
Embodiment 1:
PP100 part is weighed according to parts by weight proportioning; PET50 part; SBS5 part; EPDM1 part; PS20 part; SEP5 part; Sodium benzoate 0.2 part; DCP0.5 part; HDPE30 part;PA11 is 1 part; ACR2 part.
Raw material putting into blender mixing, is warming up to 80 DEG C, mixing velocity is 100r/min, mixes 6h.
Putting into double screw extruder after mix homogeneously, barrel temperature 170 DEG C, 175 DEG C, 180 DEG C, 185 DEG C, 190 DEG C, extruder temperature 190 DEG C, head temperature 190 DEG C, 195 DEG C, 200 DEG C, 205 DEG C, 210 DEG C, screw speed 18r/min, feed intake rotating speed 30r/min.
Product hot strength 40MPa, impact strength 100kJ/m2; Product Vicat softening point 140 DEG C, burning velocity 2mm/min; Product strength is high, bending strength 60MPa, elastic modelling quantity 800MPa, elongation at break 8%.
Embodiment 2:
PP100 part is weighed according to parts by weight proportioning; PET90 part; SBS25 part; EPDM5 part; PS40 part; SEP25 part; Sodium benzoate 0.6 part; DCP2.5 part; HDPE50 part; PA11 is 20 parts; ACR6 part.
Raw material putting into blender mixing, is warming up to 100 DEG C, mixing velocity is 120r/min, mixes 10h.
Putting into double screw extruder after mix homogeneously, barrel temperature 180 DEG C, 185 DEG C, 190 DEG C, 195 DEG C, 200 DEG C, extruder temperature 200 DEG C, head temperature 200 DEG C, 205 DEG C, 210 DEG C, 215 DEG C, 220 DEG C, screw speed 22r/min, feed intake rotating speed 40r/min.
Product hot strength 50MPa, impact strength 110kJ/m2; Product Vicat softening point 145 DEG C, burning velocity 5mm/min; Product strength is high, bending strength 75MPa, elastic modelling quantity 850MPa, elongation at break 9%.
Embodiment 3:
PP100 part is weighed according to parts by weight proportioning; PET60 part; SBS10 part; EPDM2 part; PS25 part; SEP10 part; Sodium benzoate 0.3 part; DCP1 part; HDPE35 part; PA11 is 5 parts; ACR3 part.
Raw material putting into blender mixing, is warming up to 80 DEG C, mixing velocity is 100r/min, mixes 6h.
Putting into double screw extruder after mix homogeneously, barrel temperature 170 DEG C, 175 DEG C, 180 DEG C, 185 DEG C, 190 DEG C, extruder temperature 190 DEG C, head temperature 190 DEG C, 195 DEG C, 200 DEG C, 205 DEG C, 210 DEG C, screw speed 18r/min, feed intake rotating speed 30r/min.
Product hot strength 60MPa, impact strength 12kJ/m2; Product Vicat softening point 150 DEG C, burning velocity 4mm/min; Product strength is high, bending strength 70MPa, elastic modelling quantity 900MPa, elongation at break 10%.
Embodiment 4:
PP100 part is weighed according to parts by weight proportioning; PET80 part; SBS20 part; EPDM4 part; PS35 part; SEP20 part; Sodium benzoate 0.5 part; DCP2 part; HDPE45 part; PA11 is 15 parts; ACR5 part.
Raw material putting into blender mixing, is warming up to 80-100 DEG C, mixing velocity is 100-120r/min, mixes 6-10h.
Putting into double screw extruder after mix homogeneously, barrel temperature 180 DEG C, 185 DEG C, 190 DEG C, 195 DEG C, 200 DEG C, extruder temperature 200 DEG C, head temperature 200 DEG C, 205 DEG C, 210 DEG C, 215 DEG C, 220 DEG C, screw speed 22r/min, feed intake rotating speed 40r/min.
Product hot strength 70MPa, impact strength 130kJ/m2; Product Vicat softening point 155 DEG C, burning velocity 3mm/min; Product strength is high, bending strength 75MPa, elastic modelling quantity 950MPa, elongation at break 9%.
Embodiment 5:
PP100 part is weighed according to parts by weight proportioning; PET70 part; SBS15 part; EPDM3 part; PS30 part; SEP15 part; Sodium benzoate 0.4 part; DCP1.5 part; HDPE40 part; PA11 is 10 parts;ACR4 part.
Raw material putting into blender mixing, is warming up to 90 DEG C, mixing velocity is 110r/min, mixes 8h.
Putting into double screw extruder after mix homogeneously, barrel temperature 175 DEG C, 180 DEG C, 185 DEG C, 190 DEG C, 195 DEG C, extruder temperature 195 DEG C, head temperature 195 DEG C, 200 DEG C, 205 DEG C, 210 DEG C, 215 DEG C, screw speed 20r/min, feed intake rotating speed 35r/min.
Product hot strength 80MPa, impact strength 140kJ/m2; Product Vicat softening point 160 DEG C, burning velocity 2mm/min; Product strength is high, bending strength 80MPa, elastic modelling quantity 1000MPa, elongation at break 8%.
Compositions all components in above example all can be commercially available.
Above-described embodiment is only intended to present disclosure is illustrated, rather than restriction, and the therefore any change in the implication suitable with claims of the present invention and scope, all it is believed that be included in the scope of claims.

Claims (6)

1. a PP and PET alloy, it is characterised in that the raw materials by weight portion proportioning of described PP and PET alloy is as follows: PP100 part; PET50-90 part; SBS5-25 part; EPDM1-5 part; PS20-40 part; SEP5-25 part; Sodium benzoate 0.2-0.6 part; DCP0.5-2.5 part; HDPE30-50 part; PA11 is 1-20 part; ACR2-6 part.
2. a kind of PP according to claim 1 and PET alloy, it is characterised in that described PP and PET alloy raw materials by weight portion proportioning are as follows: PP100 part; PET60-80 part; SBS10-20 part; EPDM2-4 part; PS25-35 part; SEP10-20 part; Sodium benzoate 0.3-0.5 part; DCP1-2 part; HDPE35-45 part; PA11 is 5-15 part; ACR3-5 part.
3. a kind of PP according to claim 1 and PET alloy, it is characterised in that the raw materials by weight portion proportioning of described PP and PET alloy is as follows: PP100 part; PET60 part; SBS10 part; EPDM2 part; PS25 part; SEP10 part; Sodium benzoate 0.3 part; DCP1 part; HDPE35 part; PA11 is 5 parts; ACR3 part.
4. a kind of PP according to claim 1 and PET alloy, it is characterised in that the raw materials by weight portion proportioning of described PP and PET alloy is as follows: PP100 part; PET80 part; SBS20 part; EPDM4 part; PS35 part; SEP20 part; Sodium benzoate 0.5 part; DCP2 part; HDPE45 part; PA11 is 15 parts; ACR5 part.
5. a kind of PP according to claim 1 and PET alloy, it is characterised in that: the raw materials by weight portion proportioning of described PP and PET alloy is as follows: PP100 part; PET70 part; SBS15 part; EPDM3 part; PS30 part; SEP15 part; Sodium benzoate 0.4 part; DCP1.5 part; HDPE40 part; PA11 is 10 parts; ACR4 part.
6. the preparation method of PP described in a claim 1 and PET alloy, it is characterised in that comprise the steps:
The first step: weigh PP, PET, SBS, EPDM, PS, SEP, sodium benzoate, DCP, HDPE, PA11 and ACR according to parts by weight proportioning;
Second step: raw material putting into blender mixing, is warming up to 80-100 DEG C, mixing velocity is 100-120r/min, mixes 6-10h;
3rd step: put into double screw extruder after mix homogeneously, barrel temperature 170-180 DEG C, 175-185 DEG C, 180-190 DEG C, 185-195 DEG C, 190-200 DEG C, extruder temperature 190-200 DEG C, head temperature 190-200 DEG C, 195-205 DEG C, 200-210 DEG C, 205-215 DEG C, 210-220 DEG C, screw speed 18-22r/min, feed intake rotating speed 30-40r/min.
CN201610131222.6A 2016-03-09 2016-03-09 PP and PET alloy and preparation method thereof Pending CN105647012A (en)

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Application Number Priority Date Filing Date Title
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101580612A (en) * 2009-05-21 2009-11-18 东莞普能塑料科技实业有限公司 PP/PET alloy material and preparation process thereof
CN104277323A (en) * 2013-07-03 2015-01-14 合肥杰事杰新材料股份有限公司 Heat-conduction impact resistant polypropylene/polyester composite material and its preparation method
CN104387662A (en) * 2014-10-31 2015-03-04 浙江铧淳塑料有限公司 Low-cost scratch-resistant PP/PET (propene polymer/polyethylene terephthalate) alloy material and preparation method thereof
CN105153539A (en) * 2015-08-28 2015-12-16 苏州莱特复合材料有限公司 PP (polypropylene) plastic alloy and method for preparing same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101580612A (en) * 2009-05-21 2009-11-18 东莞普能塑料科技实业有限公司 PP/PET alloy material and preparation process thereof
CN104277323A (en) * 2013-07-03 2015-01-14 合肥杰事杰新材料股份有限公司 Heat-conduction impact resistant polypropylene/polyester composite material and its preparation method
CN104387662A (en) * 2014-10-31 2015-03-04 浙江铧淳塑料有限公司 Low-cost scratch-resistant PP/PET (propene polymer/polyethylene terephthalate) alloy material and preparation method thereof
CN105153539A (en) * 2015-08-28 2015-12-16 苏州莱特复合材料有限公司 PP (polypropylene) plastic alloy and method for preparing same

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Application publication date: 20160608