CN103709520A - Beta PP-R tubular product, and manufacturing method thereof - Google Patents
Beta PP-R tubular product, and manufacturing method thereof Download PDFInfo
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- CN103709520A CN103709520A CN201210380418.0A CN201210380418A CN103709520A CN 103709520 A CN103709520 A CN 103709520A CN 201210380418 A CN201210380418 A CN 201210380418A CN 103709520 A CN103709520 A CN 103709520A
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- beta
- pipe
- tubular product
- ppr
- nucleator
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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
-
- 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
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
-
- 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
-
- 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
- C08L2205/24—Crystallisation aids
Abstract
The invention discloses a beta PP-R tubular product. The beta PP-R tubular product comprises PP-R; PP-R comprises, by mass, 40 to 70% of Beta-PPR, 2 to 4 % of a color master, 0.7 to 2% of nano silicon carbide, 0.5 to 2% of a long-acting oxygen inhibitor, and 1 to 3% of a nucleating agent. The invention also relates to a manufacturing method of the beta PP-R tubular product. The manufacturing method is simple; production efficiency is high; structural strength and performance of obtained products are improved greatly; service life is prolonged significantly; the beta PP-R tubular product possesses super high-temperature resistance, high compression strength, excellent high-temperature creep resistance, low linear expansion coefficient, and high heat distortion temperature; hot-melt conjunction of the beta PP-R tubular product with pipe fittings is convenient; installation is simple; and artificial cost is reduced greatly.
Description
Technical field
A kind of beta PP-R pipe of the present invention, also relates to a kind of method of manufacturing this beta PP-R pipe.
Background technology
Tubing is most often PP-R tubing at present, has very large advantage in performance, is deeply subject to liking of numerous people.But the PP-R tubing on existing market is Shortcomings still, haves much room for improvement.Such as, the stress of resistance to ring is not high, affects work-ing life, heat-drawn wire is not high, do not have Properties of High Temperature Creep, thermal expansivity is large simultaneously, causes distortion when installing and using, affect outward appearance beautiful, in addition, before flex point, tubing is plastic fracture in process of production, after flex point, is brittle rupture, cause production cost to increase, have much room for improvement.
Addressing these problems is extremely urgent as from the foregoing!
Summary of the invention
The object of the invention is for a kind of beta PP-R pipe is provided, structural strength and performance improve greatly, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
For achieving the above object, technical scheme of the present invention is:
Beta PP-R pipe, is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，40-70%；
Look female, 2-4%;
Nanometer gold emery, 0.7-2%;
Long-acting oxygen-inhibiting agent, 0.5-2%;
Nucleator, 1-3%.
Further, its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，50-65%；
Look female, 2-3%;
Nanometer gold emery, 1-1.5%;
Long-acting oxygen-inhibiting agent, 1-1.5%;
Nucleator, 1-2%.
Further, its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，55%；
Look female, and 2.5%;
Nanometer gold emery, 1%;
Long-acting oxygen-inhibiting agent, 1.5%;
Nucleator, 1.5%.
Long-acting oxygen-inhibiting agent, is also called negative contact agent in the present invention, is also called negative catalyst or inhibitor, and it slows down chemical reaction, and principle is to reduce the required activation energy of reaction.
Nucleator is to be applicable to the imperfect crystal plastics such as polyethylene, polypropylene, see through the crystallization behavior that changes resin, accelerate crystallization rate, increase crystal density and impel fine grain size, reach the new functional agent that shortens shaping cycle, improves the physical and mechanical propertiess such as the goods transparency, surface luster, tensile strength, rigidity, heat-drawn wire, shock resistance, creep resistance.
Beta-PPR, is random copolymers (R=is random), and its crystal (C=crystallization) is mainly hexagonal structure.
By above-mentioned formula products obtained therefrom: beta PP-R pipe of the present invention has the following advantages:
(1) features such as conventional plastic tubing is met high temperature creep, and work-ing life is short, and heat-drawn wire is low, and size is unstable have been overcome.(2) thermostable, that current unique energy meets 95/70 ℃ of tubing system of entering backwater high temperature heating requirement, than current PP-R, PE-RT, plastic-aluminum, steady state pipe, 25 ℃ (take PP-R, PE-RT do not have to improve the pipe of making as raw material, maximum operation (service) temperature is 70 ℃) have been improved.
(3) compressive strength is high, can be satisfied with Highrise buildings 10Kg, the requirement of 95/70 ℃ of hot water heating pipe, withstand voltage (95 ℃) can bear 10 kg working pressures, improved 6kg(take the pipe that PP-R, PE-RT make as raw material than current PP-R, and 95 ℃ of maximums, to bear pressure be 4kg).
(4) high temperature and creep resistance, is best suited for high temperature heating system applies, is satisfied with service requirements in 50 years.
(5) linear expansivity is little, and hot water is used that modification outward appearance is not beautiful.Pipe linear expansion coefficient is reduced to 5.58 * 10-5, than current PP-R, has reduced by 70 times.
(6) thermal change type temperature is high, and long service life in 50 years (95 ℃) life-spans under applied at elevated temperature state, has improved 40 years work-ing life (take the pipe that PP-R, PE-RT make as raw material, at 95 ℃ at most 10 years work-ing life) than current PP-R.
(7) structure blocking oxygen, protection metal parts is avoided oxidation.
(8) tubing and pipe fitting hot melt are easy to connect,, Never-leakage is used safety.
(9) cost performance is excellent, than metal composite pipe, has cost and price advantage.
(10) install easily, labour cost is low, and tubing system is attractive in appearance, beautiful.
(11) improved toughness and lower temperature resistance to-15 ℃ of shock resistance crack-frees, than current PP-R, reduced by 15 ℃ (PP-R is 0 ℃ of beam shock test simply)
(12) than current PP-R, PE-RT, compare, compressive strength has improved 30%.
Beta PP-R pipe of the present invention and PP-R contrast:
(1) compressive strength is high, and resistance to ring stress ratio PP-R is high by 40～45%, and long service life is safer.
(2) heat-drawn wire is high, high temperature creep-resisting, and use temperature is than the high 26 ℃ of left and right of common PP-R, and resistance to elevated temperatures is superior.
(3) thermal expansivity is little, is 1/3 of common PP-R, installs and uses indeformablely, and outward appearance is beautiful.
(4) can be used for≤95 ℃ of heating, Heat Supply Engineering.
(5) before flex point, tubing is plastic fracture, after flex point, it is brittle rupture, and there are 71 ℃ of left and right in PP-R flex point, beta PP-R pipe of the present invention does not have flex point, for guaranteeing Long Service Life, general recommendations PP-R use temperature be controlled at 70 ℃ comparatively reliable below, β PP-R is can life-time service below 95 ℃.
Beta PP-R pipe of the present invention and the contrast of plastic-aluminum steady state pipe:
Plastic-aluminum steady state pipe will remove the aluminium strip on plastic-aluminum steady state pipe with stripper when mounted, increased working strength, simultaneously because of reasons such as out of roundness are large, be easy to cause tubing to be connected leakage accident with pipe fitting hot melt, plastic-aluminum steady state pipe is easy to disconnect from soldering opening when mounted, and beta PP-R pipe of the present invention is lightweight, easy for installation, can directly weld with common heat melting device, need heat exchange not melt chieftain, transportation cost is low, is connected with pipe fitting hot melt, has overcome the shortcoming of plastic-aluminum steady state pipe welding completely.Cost performance, thermal expansivity is substantially the same with plastic-aluminum steady state pipe with internal pressure strength, even stable than it, but price is low well below plastic-aluminum steady state pipe.
Beta PP-R pipe of the present invention is compared with copper pipe
Beta PP-R pipe of the present invention is connected with pipe fitting and than copper pipe, is connected, constructs with pipe fitting more easily and safety, saving of labor, save time, province's expense, sanitation performance is reliable, safety, and copper pipe water body has by the danger of cupric ion and verdigris pollution, thermal conductivity is copper pipe 1/200, energy-conservation, heat retaining property is better than copper pipe; Because heating, must be incubated for hankering copper pipe.
It is copper pipe 1/20 that beta PP-R pipe unit length of the present invention consumes energy, and not only lowers consumption but also energy-conservation
Two of object of the present invention, is for a kind of method of manufacturing beta PP-R pipe is provided, and it is characterized in that: comprise the following steps:
The first step, proportionally enters mechanical stirring device through weighing by proportioning by raw material and carries out mix and blend, and by vacuum pay-off, to deliver to hopper standby mixing;
Second step, melt extrudes: in extruding machine, heat, plasticizing, homogenizing be by runner, mouthful mould, forms pipe embryo;
The 3rd step, compound extruded: the internal layer through being mixed, ribbon identification PP Pipe Compound through co-extrusion forcing machine, by composite die, form be evenly distributed internal layer and sign chromatape on pipe embryo circumference;
The 4th step, spraying cooling: be at high temperature extruded the pipe embryo of mould, after vacuum sizing, carry out immediately spraying cooling;
The 5th step, sign is printed and is carried out fixed length cutting;
The 6th step, automatic winding, inspection after construction, packing warehouse-in.
Beneficial effect of the present invention: the present invention is simple in manufacturing process, production efficiency is high, structure of title compound intensity and performance improve greatly simultaneously, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
In order further to explain technical scheme of the present invention, below by specific embodiment, the present invention will be described in detail.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
The present embodiment discloses a kind of beta PP-R pipe, it is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，40%；
Look female, and 4%;
Nanometer gold emery, 2%;
Long-acting oxygen-inhibiting agent, 0.5%;
Nucleator, 3%.
Product by above-mentioned formula gained, structural strength and performance improve greatly, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
Embodiment 2
The present embodiment discloses a kind of beta PP-R pipe, it is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，?70%；
Look female, and 2%;
Nanometer gold emery, 0.7%;
Long-acting oxygen-inhibiting agent, 0.5%;
Nucleator, 1%.
Product by above-mentioned formula gained, structural strength and performance improve greatly, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
Embodiment 3
The present embodiment discloses a kind of beta PP-R pipe, it is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，50%；
Look female, and 2%;
Nanometer gold emery, 2%;
Long-acting oxygen-inhibiting agent, 1%;
Nucleator, 1.5%.
Product by above-mentioned formula gained, structural strength and performance improve greatly, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
Embodiment 4
The present embodiment discloses a kind of beta PP-R pipe, it is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，45%；
Look female, and 3%;
Nanometer gold emery, 1.2%;
Long-acting oxygen-inhibiting agent, 1%;
Nucleator, 1.7%.
Product by above-mentioned formula gained, structural strength and performance improve greatly, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
Embodiment 5
The present embodiment discloses a kind of beta PP-R pipe, it is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，60%；
Look female, and 2.5%;
Nanometer gold emery, 1.7%;
Long-acting oxygen-inhibiting agent, 1%;
Nucleator, 2.5%.
Product by above-mentioned formula gained, structural strength and performance improve greatly, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
Embodiment 6
The present embodiment discloses a kind of beta PP-R pipe, it is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，55%；
Look female, and 3.5%;
Nanometer gold emery, 1.5%;
Long-acting oxygen-inhibiting agent, 1.4%;
Nucleator, 2%.
Product by above-mentioned formula gained, structural strength and performance improve greatly, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
Embodiment 7
The present embodiment discloses a kind of beta PP-R pipe, it is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，65%；
Look female, and 3.5%;
Nanometer gold emery, 0.7%;
Long-acting oxygen-inhibiting agent, 0.8%;
Nucleator, 1.8%.
Product by above-mentioned formula gained, structural strength and performance improve greatly, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
Embodiment 8
The present embodiment discloses a kind of beta PP-R pipe, it is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，60%；
Look female, and 2.3%;
Nanometer gold emery, 1%;
Long-acting oxygen-inhibiting agent, 1.5%;
Nucleator, 2%.
Product by above-mentioned formula gained, structural strength and performance improve greatly, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
Embodiment 9
The present embodiment discloses a kind of beta PP-R pipe, it is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，58%；
Look female, and 2.8%;
Nanometer gold emery, 1.8%;
Long-acting oxygen-inhibiting agent, 1.5%;
Nucleator, 2.8%.
Product by above-mentioned formula gained, structural strength and performance improve greatly, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
Embodiment 10
The present embodiment discloses a kind of beta PP-R pipe, it is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，50%；
Look female, and 2.7%;
Nanometer gold emery, 1.9%;
Long-acting oxygen-inhibiting agent, 0.9%;
Nucleator, 1.8%.
Product by above-mentioned formula gained, structural strength and performance improve greatly, greatly extend work-ing life, have that thermostable, compressive strength are high, high temperature and creep resistance, linear expansivity is little, thermal change type temperature is high, and tubing and pipe fitting hot melt easy to connect, install easily, cost of labor expense reduces greatly.
Two of object of the present invention, is for a kind of method of manufacturing beta PP-R pipe is provided, and it is characterized in that: comprise the following steps:
The first step, proportionally enters mechanical stirring device through weighing by proportioning by raw material and carries out mix and blend, and by vacuum pay-off, to deliver to hopper standby mixing;
Second step, melt extrudes: in extruding machine, heat, plasticizing, homogenizing be by runner, mouthful mould, forms pipe embryo;
The 3rd step, compound extruded: the internal layer through being mixed, ribbon identification PP Pipe Compound through co-extrusion forcing machine, by composite die, form be evenly distributed internal layer and sign chromatape on pipe embryo circumference;
The 4th step, spraying cooling: be at high temperature extruded the pipe embryo of mould, after vacuum sizing, carry out immediately spraying cooling;
The 5th step, sign is printed and is carried out fixed length cutting;
The 6th step, automatic winding, inspection after construction, packing warehouse-in.
Claims (4)
1. beta PP-R pipe, is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，40-70%；
Look female, 2-4%;
Nanometer gold emery, 0.7-2%;
Long-acting oxygen-inhibiting agent, 0.5-2%;
Nucleator, 1-3%.
2. beta PP-R pipe according to claim 1, is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，50-65%；
Look female, 2-3%;
Nanometer gold emery, 1-1.5%;
Long-acting oxygen-inhibiting agent, 1-1.5%;
Nucleator, 1-2%.
3. beta PP-R pipe according to claim 2, is characterized in that: its composition comprises PP-R, with the mass percent of PP-R, also comprises following composition:
Beta-PPR，55%；
Look female, and 2.5%;
Nanometer gold emery, 1%;
Long-acting oxygen-inhibiting agent, 1.5%;
Nucleator, 1.5%.
4. a method of manufacturing beta PP-R pipe described in claim 1, is characterized in that: comprise the following steps:
The first step, proportionally enters mechanical stirring device through weighing by proportioning by raw material and carries out mix and blend, and by vacuum pay-off, to deliver to hopper standby mixing;
Second step, melt extrudes: in extruding machine, heat, plasticizing, homogenizing be by runner, mouthful mould, forms pipe embryo;
The 3rd step, compound extruded: the internal layer through being mixed, ribbon identification PP Pipe Compound through co-extrusion forcing machine, by composite die, form be evenly distributed internal layer and sign chromatape on pipe embryo circumference;
The 4th step, spraying cooling: be at high temperature extruded the pipe embryo of mould, after vacuum sizing, carry out immediately spraying cooling;
The 5th step, sign is printed and is carried out fixed length cutting;
The 6th step, automatic winding, inspection after construction, packing warehouse-in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210380418.0A CN103709520A (en) | 2012-10-09 | 2012-10-09 | Beta PP-R tubular product, and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210380418.0A CN103709520A (en) | 2012-10-09 | 2012-10-09 | Beta PP-R tubular product, and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN103709520A true CN103709520A (en) | 2014-04-09 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210380418.0A Pending CN103709520A (en) | 2012-10-09 | 2012-10-09 | Beta PP-R tubular product, and manufacturing method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106893133A (en) * | 2017-03-06 | 2017-06-27 | 江苏三水企业孵化器有限公司 | A kind of preparation method of refractory polyethylene bellows |
| CN107501755A (en) * | 2017-10-12 | 2017-12-22 | 桐城市文才管业有限公司 | A kind of PP R three-way connections and preparation method thereof |
| CN107619542A (en) * | 2017-09-26 | 2018-01-23 | 桐城市中汇塑业有限公司 | A kind of self-cleaning kitchen and bath's tubing of PP R and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1361197A (en) * | 2000-12-29 | 2002-07-31 | 中国石化集团齐鲁石油化工公司 | Polypropylene composition for hot water pipe and its prepn |
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2012
- 2012-10-09 CN CN201210380418.0A patent/CN103709520A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1361197A (en) * | 2000-12-29 | 2002-07-31 | 中国石化集团齐鲁石油化工公司 | Polypropylene composition for hot water pipe and its prepn |
Non-Patent Citations (2)
| Title |
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| 李雪，刘宣伯，张丽英: ""成核剂对丙烯-1-丁烯无规共聚物"", 《合成树脂及塑料》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106893133A (en) * | 2017-03-06 | 2017-06-27 | 江苏三水企业孵化器有限公司 | A kind of preparation method of refractory polyethylene bellows |
| CN107619542A (en) * | 2017-09-26 | 2018-01-23 | 桐城市中汇塑业有限公司 | A kind of self-cleaning kitchen and bath's tubing of PP R and preparation method thereof |
| CN107501755A (en) * | 2017-10-12 | 2017-12-22 | 桐城市文才管业有限公司 | A kind of PP R three-way connections and preparation method thereof |
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Application publication date: 20140409 |