CN100497468C - High damping polyvinyl chloride material and method for preparing pipe - Google Patents

High damping polyvinyl chloride material and method for preparing pipe Download PDF

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Publication number
CN100497468C
CN100497468C CNB2007100289204A CN200710028920A CN100497468C CN 100497468 C CN100497468 C CN 100497468C CN B2007100289204 A CNB2007100289204 A CN B2007100289204A CN 200710028920 A CN200710028920 A CN 200710028920A CN 100497468 C CN100497468 C CN 100497468C
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parts
damping
polyvinyl chloride
agent
stabilizer
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CN101104719A (en
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陈国南
张文昌
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Guangdong Liansu Technology Industrial Co Ltd
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Guangdong Liansu Technology Industrial Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • 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
    • B29C48/94—Lubricating
    • B29C48/95—Lubricating by adding lubricant to the moulding material
    • 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
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92828—Raw material handling or dosing, e.g. active hopper or feeding device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92866—Inlet shaft or slot, e.g. passive hopper; Injector, e.g. injector nozzle on barrel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92885—Screw or gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92933—Conveying, transporting or storage of articles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses a high damping polyvinyl chloride material and a method for preparing pipes with the high damping polyvinyl chloride material. The high damping polyvinyl chloride material contains polyvinyl chloride resin 100 portions, heat stabilizer 0.4 to 0.6 portions, lubricant 2.0 to 4.0 portions, filler agent 2.0 to 4.0 portions, damping modifier 10 to 14 portions and silane coupling agent 0.4 to 0.6 portions in weight unit. The polyvinyl chloride has better damping performance and higher softening temperature after being modified, particularly with the damping modifier being added, so that the polyvinyl chloride material can reduce the noise of water flow and resist stronger impact and improve the safety of pipe operation. Meanwhile, the method for preparing the pipes in the invention is in simple process and easy operation.

Description

A kind of high damping polyvinyl chloride material and be used to prepare the method for tubing
Technical field
The present invention relates to PVC modified technical field, specifically, relate to a kind of high damping polyvinyl chloride material and be used to prepare the method for tubing.
Background technology
Water drainage-supply system is the important component part of urban construction.Traditional waterworks mainly adopts metal pipe material, and metallic conduit pollutes owing to the metallic corrosion meeting.And plastic pipe characteristics such as especially hard polyvinyl chloride pipe (PVC-U) is in light weight because of having, corrosion-resistant, the current loss is little, easy for installation have been subjected to the favor of pipework circle; Compare with the conventional metals pipe because of plastics tubing simultaneously, its production energy consumption is few, and environmental pollution is little, is subjected to government and relevant industries day by day and payes attention to.At home and abroad, plastic pipe is alternative metals tubing just constantly, develops very rapid.Yet PVC-U tubing is because the shortcoming of himself has limited further developing of it again, and these shortcomings mainly show as poor toughness, and undamped, and the current noise is big.Therefore the PVC-U tubing to routine carries out modification, to improve its damping capacity, reduces the current noise, improves its toughness simultaneously, for the quality that improves the pvc pipe material with to widen its Application Areas significant.
U.S. Pat 7,199,191B2 discloses a kind of shock resistance and mobile plasticized modifier that can improve PVC, and this invention is with olefin elastomer and chlorinatedpolyethylene blend, utilizes the plasticized modifier of this blend as polyvinyl chloride.The plasticized modifier of this invention can improve the toughness of polyvinyl chloride effectively; But the not mentioned damping capacity that can improve the pvc pipe material in this invention.
Chinese patent CN1919919A discloses a kind of high rush-resistant polyvinyl chloride pipe for drinking and preparation method thereof, this invention is to utilize one or more materials among chlorinatedpolyethylene, ACR or the MBS to add in the polyvinyl chloride (PVC) RESINS, through extrusion moulding, thereby make high rush-resistant polyvinyl chloride pipe for drinking.Its toughness of the polychloroethylene pipes of this invention (erosion-resisting characteristics) has obtained improving preferably, but still fails to improve the damping capacity of pvc pipe material.
Before the present invention sends, do not see research report relevant for the damping capacity that improves polychloroethylene pipes.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, a kind of pvc material of high damping properties is provided.
Another object of the present invention provides the method that above-mentioned pvc material is used to prepare tubing.
Purpose of the present invention can realize by following measure:
A kind of high damping polyvinyl chloride material, the unit meter contains 100 parts of polyvinyl chloride resins by weight, 0.4～0.6 part of thermo-stabilizer, 2.0～4.0 parts of lubricants, 2.0～4.0 parts of weighting agents, 10～14 parts of damping modification agent, 0.4～0.6 part of silane coupling agent; Described thermo-stabilizer is an organo-tin het stabilizer; Described lubricant is a calcium stearate; Described weighting agent is a treated carbonates.
The effect of described thermo-stabilizer is in the resin treatment process, prevents or suppresses the resin hydrogenchloride of degrading, and can keep enough stability simultaneously and slow down degraded in the effective service life of goods, increases the service life.
The effect of described lubricant is the adhesion that prevents between the metal parts of resin melt and processing units, improves the flow rate of melt, reduces the resistance to displacement of material melt in the processing itself, and promotes plasticizing.
The effect of described weighting agent is the increase capacity, reduces cost, and processing characteristics, the mechanical property of improving the plastics preparation.
The effect of described damping modification agent is the damping capacity that improves polychloroethylene pipes, reduces the current noise, and the impact resistance that improves tubing.
The effect of described silane coupling agent is the consistency that promotes between resin and other additives, thereby improves the over-all properties of goods.
In above-mentioned high damping polyvinyl chloride material, described component preferred proportion by weight is: 100 parts of polyvinyl chloride resins, 0.5 part of thermo-stabilizer, 3.0 parts of lubricants, 3.0 parts of weighting agents, 12 parts of damping modification agent, 0.5 part of silane coupling agent.
In above-mentioned high damping polyvinyl chloride material, consisting of of described damping modification agent: 3～5 parts of the maleic anhydride grafts (SEBS-g-MAH) of vinylbenzene-divinyl-styrene block copolymer hydrogenated elastomer, 5～7 parts of the maleic anhydride grafts of polyolefin elastomer (POE-g-MAH), 2 parts of ethylene-ethyl acrylate copolymers (EEA).
In above-mentioned high damping polyvinyl chloride material, the preferred γ-An Bingjisanyiyangjiguiwan of described silane coupling agent (KH550).
Above-mentioned high damping polyvinyl chloride material can be used to prepare tubing, and its preparation method may further comprise the steps:
(1), polyvinyl chloride resin, thermo-stabilizer, lubricant, weighting agent, damping modification agent, silane coupling agent joined heat mix in the machine, under 120 ℃, mix;
(2), above-mentioned compound is put into cold mixer, cold mixing to 45 ℃;
(3), be dosed in the twin screw extruder through cold mixed compound with above-mentioned, extruding pipe material, the processing parameter of extrusion is as follows:
170 ℃ of body temperatures, 170 ℃, 120 ℃, 140 ℃, 170 ℃
170 ℃ of head temperatures, 180 ℃, 190 ℃, 200 ℃, 210 ℃
20 rev/mins of main frame revolutions, draw 64.5 meters/minute by reinforced 30 rev/mins;
(4), the tubing of extruding is through the vacuum sizing cooling forming;
(5), the tubing after the moulding is through fixed length cutting, enlarging moulding, packing, promptly makes finished product.Compared with prior art, the present invention has following beneficial effect:
The present invention is by carrying out modification to polyvinyl chloride, especially the adding of damping modification agent, make the polyvinyl chloride after the modification have good damping performance and higher softening temperature, can reduce current noise and the stronger surging force of opposing, improve the security of tubing operation.Simultaneously, the method for preparing tubing proposed by the invention, technology is simple, easily operation.
Embodiment
The preparation method that high damping polyvinyl chloride material of the present invention is used to prepare tubing is:
(1), PVC-U resin, thermo-stabilizer, lubricant, weighting agent, damping modification agent, silane coupling agent joined heat mix in the machine, under 120 ℃, mix;
(2), above-mentioned compound is put into cold mixer, cold mixing to 45 ℃;
(3), be dosed in the twin screw extruder through cold mixed compound with above-mentioned, extruding pipe material, the processing parameter of extrusion is as follows:
170 ℃ of body temperatures, 170 ℃, 120 ℃, 140 ℃, 170 ℃
170 ℃ of head temperatures, 180 ℃, 190 ℃, 200 ℃, 210 ℃
20 rev/mins of main frame revolutions, draw 64.5 meters/minute by reinforced 30 rev/mins;
(4), the tubing of extruding is through the vacuum sizing cooling forming;
(5), the tubing after the moulding is through fixed length cutting, enlarging moulding, packing, promptly makes finished product.Utilize above-mentioned preparation method, the prescription of embodiment 1～3 is as shown in table 1:
Table 1
Embodiment 1 Embodiment 2 Embodiment 3
SG-5 type polyvinyl chloride (PVC) RESINS 100 100 100
Stablizer organotin T-178 0.5 0.5 0.5
Calcium stearate 3 3 3
Treated carbonates 3 3 3
SEBS-g-MAH 3 4 5
POE-g-MAH 7 6 5
EEA 2 2 2
KH-550 0.5 0.5 0.5
Used PVC-U resin is a SG-5 type resin, and technical indicator is: apparent density 〉=0.4g/cm 3Fugitive constituent≤0.5%.Used weighting agent is a treated carbonates, and technical indicator is: granularity 400-1250 order, water ratio≤0.3%.
Used damping modification agent is the mixture of SEBS-g-MAH, POE-g-MAH and EEA.The technical indicator of SEBS-g-MAH is: outward appearance is faint yellow, the semi-transparent resin particle, melting index 〉=2.7g/min.The technical indicator of POE-g-MAH is: little yellow resin particle, melting index 〉=0.3g/min.The technical indicator of EEA is: EA content 5-20%, melting index 〉=3.5g/min.
The softening point temperature of the high damping polyvinyl chloride tubing that the present invention makes is tested according to standard GB/T1633-2000 " mensuration of thermoplastics vicat softening point temperature ", damping capacity is tested according to standard GB/T3222-94 " environmental noise measurement method ", and test result is as shown in table 2:
Table 2
Vicat softening point (℃) The current noise reduces percentage (%)
Embodiment 1 81 18
Embodiment 2 83 18
Embodiment 3 83 20

Claims (4)

1. damping pvc material, it is characterized in that: the unit meter contains 100 parts of polyvinyl chloride resins by weight, 0.4～0.6 part of thermo-stabilizer, 2.0～4.0 parts of lubricants, 2.0～4.0 parts of weighting agents, 10～14 parts of damping modification agent, 0.4～0.6 part of silane coupling agent; Described thermo-stabilizer is an organo-tin het stabilizer; Described lubricant is a calcium stearate; Described weighting agent is a treated carbonates; Consisting of of described damping modification agent: 3～5 parts of the maleic anhydride grafts of vinylbenzene-divinyl-styrene block copolymer hydrogenated elastomer, 5～7 parts of the maleic anhydride grafts of polyolefin elastomer, 2 parts of ethylene-ethyl acrylate copolymers.
2. damping pvc material as claimed in claim 1 is characterized in that described component counts by weight:
100 parts of polyvinyl chloride resins, 0.5 part of thermo-stabilizer, 3.0 parts of lubricants, 3.0 parts of weighting agents, 12 parts of damping modification agent, 0.5 part of silane coupling agent.
3. damping pvc material as claimed in claim 1 is characterized in that described silane coupling agent is a γ-An Bingjisanyiyangjiguiwan.
4. utilize the described damping pvc material of claim 1 to prepare the method for tubing, its feature may further comprise the steps:
(1) polyvinyl chloride resin, thermo-stabilizer, lubricant, weighting agent, damping modification agent, silane coupling agent are joined heat and mix in the machine, under 120 ℃, mix;
(2) above-mentioned compound is put into cold mixer, cold mixing to 45 ℃;
(3) be dosed in the twin screw extruder through cold mixed compound above-mentioned, extruding pipe material, the processing parameter of extrusion is as follows:
170 ℃ of body temperatures, 170 ℃, 120 ℃, 140 ℃, 170 ℃
170 ℃ of head temperatures, 180 ℃, 190 ℃, 200 ℃, 210 ℃
20 rev/mins of main frame revolutions, draw 64.5 meters/minute by reinforced 30 rev/mins;
(4) tubing of extruding is through the vacuum sizing cooling forming;
(5) tubing after the moulding is promptly made finished product through fixed length cutting, enlarging moulding, packing.
CNB2007100289204A 2007-06-29 2007-06-29 High damping polyvinyl chloride material and method for preparing pipe Active CN100497468C (en)

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CN102506269A (en) * 2011-11-07 2012-06-20 南京民族塑胶厂(集团) Preparation technology for solar energy-saving PVC (Polyvinyl Chloride) foamed pipe
CN102417680A (en) * 2011-11-30 2012-04-18 广东联塑科技实业有限公司 Lead-free PVC-U (Poly Vinyl Chloride-Unplasticized) pipe for drainage and manufacturing method thereof
CN103897287A (en) * 2012-12-27 2014-07-02 浙江艾迪雅科技股份有限公司 Multimode organic filler/polymer composite damping material and manufacturing method thereof
CN104844960A (en) * 2015-01-14 2015-08-19 无锡龙舜实业有限公司 Manufacturing process of directly buried PVC pipe
CN104993433A (en) * 2015-07-07 2015-10-21 常州市拓源电缆成套有限公司 Flame-retardant and anti-static UPVC electrician tube
CN105802064A (en) * 2016-04-08 2016-07-27 苏州新区华士达工程塑胶有限公司 Plastic pipe fitting composition with high hardness
CN107903540A (en) * 2017-12-18 2018-04-13 邓权塑业科技（湖南）有限公司 A kind of polychloroethylene pipes material and preparation method thereof
CN109320879A (en) * 2018-10-25 2019-02-12 浙江坤鸿新材料有限公司 A kind of PVC nano decorative material and its disintegrating apparatus
CN111171543B (en) * 2019-12-23 2022-05-24 上海普利特伴泰材料科技有限公司 Reinforced PC/ABS composite material for sound absorption and damping and preparation method thereof
CN111454496A (en) * 2020-04-17 2020-07-28 科建高分子材料（上海）股份有限公司 High-performance automobile hot-melt damping fin and preparation method thereof
CN112759867A (en) * 2021-04-12 2021-05-07 广讯检测（广东）有限公司 Calcium-zinc stabilizer for PVC-UH (polyvinyl chloride-ultra high-temperature) pipe and preparation method thereof
CN113978073B (en) * 2021-09-28 2023-09-12 读布科技(杭州)有限公司 PVC fabric processing technology for clothing
CN115960419A (en) * 2022-12-27 2023-04-14 安徽顺豪新材料科技有限公司 Preparation process of high-thermal-stability automobile damping film
CN116006789A (en) * 2023-01-09 2023-04-25 康命源（贵州）科技发展有限公司 High-strength and high-toughness polyolefin pipe and preparation method thereof

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