CN112679836B - Water supply pipe composition and preparation method thereof - Google Patents
Water supply pipe composition and preparation method thereof Download PDFInfo
- Publication number
- CN112679836B CN112679836B CN201910993054.5A CN201910993054A CN112679836B CN 112679836 B CN112679836 B CN 112679836B CN 201910993054 A CN201910993054 A CN 201910993054A CN 112679836 B CN112679836 B CN 112679836B
- Authority
- CN
- China
- Prior art keywords
- parts
- polyethylene resin
- water supply
- supply pipe
- pipe composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention relates to a water supply pipe composition and a preparation method thereof, belonging to the technical field of water supply pipe preparation. The water supply pipe composition comprises the following raw materials in parts by weight: polyethylene resin A90-95 parts, polyethylene resin B5-10 parts and auxiliary agent master batch 4-6 parts; the polyethylene resin A is a copolymer of ethylene and 1-butene or a copolymer of ethylene and 1-hexene, and has a weight average molecular weight Mw20-23 ten thousand and molecular weight distribution D of 18-23; the polyethylene resin B is a copolymer of ethylene and 1-hexene, and has a weight average molecular weight Mw12-14 ten thousand and molecular weight distribution D of 2.9-3.3. The water supply pipe composition has excellent compressive strength, tensile strength, thermal stability and the like; the invention also provides a simple and feasible preparation method.
Description
Technical Field
The invention relates to a water supply pipe composition and a preparation method thereof, belonging to the technical field of water supply pipe preparation.
Background
The Polyethylene (PE) water supply pipe is produced by using polyethylene resin as a main raw material, adding necessary antioxidants, ultraviolet absorbers and other auxiliary agents and adopting an extrusion molding process. The pipe has the advantages of corrosion resistance, good water conveying hydraulic condition, light weight, long service life (durable for 50 years), good flexibility, good impact resistance and shock resistance, simple construction connection, convenience and rapidness, and the like. Therefore, the application of the composite material in the water supply engineering is rapidly increased in recent years, and the composite material becomes a main material of the water supply engineering.
In recent years, as the safety factor of use of water supply pipes has been increased, the pressure resistance of pipe materials has been further increased. The main service condition of the water supply pipe is about 20 ℃, so the hydrostatic strength performance of the water supply pipe at 20 ℃ is critical, and the long-term service life of the water supply pipe can be ensured due to the good hydrostatic strength performance under the high stress condition.
How to keep good flexibility and long-term slow crack growth resistance while improving hydrostatic strength of pipes under high stress conditions is always the focus of research of pipe production enterprises. At present, pipe production enterprises mainly improve the compressive strength of the pipe by means of adding a reinforcing agent, grafting modification, steel wire reinforcement and the like, but the technical process is complex, the quality of pipe products is difficult to control, and the quality stability is poor.
Chinese patent CN107226948A discloses a high-strength HDPE polyethylene water supply pipe, which comprises the following components in parts by weight: 60-80 parts of high-density polyethylene material, 10-30 parts of enhanced master batch, 2-5 parts of plasticizer, 5-7 parts of lubricant, 5.5-9 parts of composite toughening modifier, 3-8 parts of coupling agent, 3-7 parts of hygroscopic master batch, 0.3-0.8 part of phosphite antioxidant and 0.2-0.5 part of toner. The high-strength HDPE polyethylene water supply pipe is low in manufacturing cost, the strength and the tensile bending toughness of the whole structure of the water supply pipe are effectively improved, the corrosion resistance is high, the impact strength is high, and the service life is long.
Chinese patent CN04448465 discloses a PE composition, a preparation method and an application thereof, wherein the composition comprises the following raw materials in parts by weight: 75-85 parts of high-density polyethylene, 10-20 parts of metallocene linear low-density polyethylene and 8-15 parts of composite filler; the composite filler is prepared from the following raw materials in parts by weight: 35-45 parts of calcium sulfate whisker, 0.5-3 parts of silane coupling agent, 1-3 parts of paraffin, 25-35 parts of talcum powder, 35-45 parts of superfine white carbon black and 3-5 parts of maleic anhydride grafted polyethylene. The pipe prepared from the PE composition has high tensile yield strength, good rigidity, excellent impact strength and ring stiffness performance, and is suitable for trenchless directional drilling construction.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art, and provide a water supply pipe composition which has excellent compressive strength, tensile strength, thermal stability and the like; the invention also provides a simple and feasible preparation method.
The water supply pipe composition comprises the following raw materials in parts by weight:
90-95 parts of polyethylene resin A
5-10 parts of polyethylene resin B
4-6 parts of an auxiliary agent master batch;
the polyethylene resin A is a copolymer of ethylene and 1-butene or a copolymer of ethylene and 1-hexene, and has a weight average molecular weight (M)w) 20-23 ten thousand, molecular weight (M)w/Mn) The distribution D is 18-23; the density is 0.941-0.947g/cm3(ii) a 21.6 kg load melt Mass Flow Rate (MFR) of 13.0-15.0g/10min, using gas phase process (common knowledge of the skilled person), chromium based catalyst; the withstand voltage grade reaches PE100 grade.
The polyethylene resin B is a copolymer of ethylene and 1-hexene with a weight average molecular weight (M)w) Has a molecular weight (M) of 12-14 ten thousandw/Mn) The distribution D is 2.9-3.3; the density is 0.935 to 0.940g/cm3(ii) a Melt Mass Flow Rate (MFR) of 0.40-0.6g/10min under a load of 2.16 kg, using a gas phase process (well known to those skilled in the art)Common knowledge), metallocene catalyst production; the pressure resistant type is PE-RT I type.
The polyethylene resin A and the polyethylene resin B are synthesized by themselves, and the adopted processes are known by persons skilled in the art and can be realized. The polyethylene resin B is produced by adopting a metallocene catalyst, and has the advantages of excellent flexibility and elongation and long-term pressure resistance.
The auxiliary agent master batch comprises the following raw materials in parts by weight: 50 parts of polyethylene resin A, 10105 parts of antioxidant, 1685 parts of antioxidant, 50 parts of carbon black and 2 parts of polyethylene wax. The antioxidant, the carbon black and the polyethylene wax are all commercially available.
The polyethylene resin A is added into the auxiliary agent master batch, so as to ensure the dispersibility of the carbon black and the comprehensive performance of the composition.
The preparation method of the auxiliary agent master batch comprises the following steps:
mixing the components at 500 rpm for 1 minute and 1200 rpm for 3 minutes, banburying the mixture at 180 ℃ for 10 minutes by a mixer, and extruding and granulating the mixture.
The preparation method of the water supply pipe composition comprises the following steps:
(1) adding the polyethylene resin A, the polyethylene resin B and the auxiliary agent master batch into a high-speed mixer for mixing (firstly mixing for 1 minute at 500 revolutions per minute and mixing for 1 minute at 1200 revolutions per minute), and then adding the mixture into a pipe production line for extrusion (the specification of an extruder is that the diameter of a screw is 65mm, the length-diameter ratio is 30:1), and the processing temperature is 170-210 ℃ to obtain the semi-finished pipe;
(2) crystallizing the extruded pipe, heating to 80 ℃ in the first step, and preserving heat for 4 hours; secondly, cooling to 60 ℃, and preserving heat for 4 hours; and finally cooling to room temperature.
The auxiliary agent master batch has the main functions of improving the weather resistance and the heat aging resistance of the pipe and ensuring the processing and using requirements. The preparation process of the auxiliary master batch has important influence on the improvement of the performance of the pipe by the auxiliary master batch, and improper preparation process can cause carbon black agglomeration, so that the pipe is damaged due to uneven dispersion in the pipe. By designing the formula and the preparation process of the auxiliary agent, the carbon black is ensured to be well dispersed in the pipe.
The density, MFR, molecular weight and distribution of the resin affect the mechanical strength, processability and the like of the material, thereby affecting the processing and use performance of the composition. The polyethylene resin A and the polyethylene resin B are combined, so that the performances of different components are fully and comprehensively considered, and the polyethylene resin A can ensure that the composition has certain compressive strength; the addition of the polyethylene resin B can improve the elongation at break and the long-term slow crack growth resistance of the composition. The combination of the polyethylene resin A and the polyethylene resin B can ensure that the composition meets the PE100 grade requirement to a certain extent and meets the requirement of 50-year service life of the internal pressure bearing pipe.
The invention combines the performances of different components, and ensures that the components are fully and uniformly mixed by setting the blending and granulating processes, thereby ensuring that the pipe has excellent performance. The invention carries out reheating crystallization treatment after the pipe is extruded, changes the microstructure of the material and improves the pressure resistance of the pipe product.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the molecular structure and components of the resin are limited, and the pipe prepared from the composition is subjected to crystallization treatment, so that the compressive strength, the tensile strength, the thermal stability and the like of a pipe product are improved, and the pipe can meet the pressure-resistant use requirement under the high-stress condition;
(2) the tensile yield stress of the water supply pipe composition prepared by the invention is more than or equal to 23.0MPa, the elongation at break is more than or equal to 400%, the hydrostatic strength of 12.5MPa is more than or equal to 150h at 20 ℃, the oxidation induction time (210 ℃) is more than or equal to 30min, and the water supply pipe composition has good market application prospect;
(3) the preparation method is simple, easy to operate, scientific and reasonable.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the practice of the invention.
Examples 1 to 5
The polyethylene composition for producing water pipes was formulated as shown in table 1.
Density: testing after boiling for 30 minutes according to GB/T1033.2-2010 by a D method;
melt Mass Flow Rate (MFR): testing according to GB/T3682-2000;
weight average molecular weight and distribution thereof: gel Permeation Chromatography (GPC) is adopted, 2 chromatographic columns are connected in series, the solvent and the mobile phase are 1,2, 4-trichlorobenzene (containing 0.1 percent of antioxidant 2, 6-dibutyl-p-cresol), the column temperature is 150 ℃, the dissolution time is 4h, the flow rate is 1.0ml/min, and the universal calibration is carried out by adopting narrow-distribution polystyrene standard samples.
The polyethylene resin A and the polyethylene resin B are synthesized by themselves, and the adopted processes are known by persons skilled in the art and can be realized.
TABLE 1 examples 1-5 polyethylene resin compositions (in parts by weight) for water supply pipes
In the formula, the mass ratio of each component in the auxiliary master batch is as follows:
polyethylene resin a: antioxidant 1010: antioxidant 168: carbon black: polyethylene wax is 50:5:5:50: 2.
The preparation method of the auxiliary agent master batch comprises the following steps:
mixing the components at 500 rpm for 1 minute and 1200 rpm for 3 minutes, banburying the mixture at 180 ℃ for 10 minutes by a mixer, and extruding and granulating the mixture.
The preparation method of the water supply pipe composition comprises the following steps:
adding polyethylene resin A, polyethylene resin B and an auxiliary agent master batch into a high-speed mixer for mixing (firstly mixing for 1 minute at 500 revolutions per minute and mixing for 1 minute at 1200 revolutions per minute), then adding the mixture into a pipe production line for extrusion (the specification of an extruder is that the diameter of a screw is 65mm, the length-diameter ratio is 30:1), the processing temperature is 170 plus 210 ℃, crystallizing the pipe after extrusion, cooling to 80 ℃ in the first step, and preserving heat for 4 hours; secondly, cooling to 60 ℃, and preserving heat for 4 hours; and finally cooling to room temperature.
Comparative examples 1 to 3
Comparative example polyethylene resin composition the compounding ingredients are shown in table 2.
The preparation method of the auxiliary agent master batch comprises the following steps:
mixing the components at 500 rpm for 1 minute and 1200 rpm for 3 minutes, banburying the mixture at 180 ℃ for 10 minutes by a mixer, and extruding and granulating the mixture.
The method of making the water pipe composition described in comparative example 1 was as follows:
a) the preparation method of the master batch comprises the following steps: 50 parts of polyethylene resin A, 10105 parts of antioxidant, 1685 parts of antioxidant, 50 parts of carbon black and 2 parts of polyethylene wax, and all the components are blended in a high-speed mixer (mixed for 1 minute at 500 revolutions per minute and mixed for 1 minute at 1200 revolutions per minute) and then extruded and granulated at 200 ℃ by a double screw.
b) The preparation method of the composition comprises the following steps: the polyethylene resin A, the polyethylene resin B and the auxiliary agent master batch are added into a high-speed mixer (500 rpm for 1 minute and 1200 rpm for 1 minute) according to a certain proportion, then are added into a pipe production line (the specification of an extruder is that the diameter of a screw is 65mm, the length-diameter ratio is 30:1, and the processing temperature is 170-210 ℃) to prepare a pipe, and are cooled to room temperature.
The water pipe compositions of comparative examples 2-3 were prepared as follows:
a) the preparation method of the auxiliary agent master batch comprises the following steps: 50 parts of polyethylene resin B, 10105 parts of antioxidant, 1685 parts of antioxidant, 50 parts of carbon black and 2 parts of polyethylene wax, and the components are blended in a high-speed mixer (mixed for 1 minute at 500 revolutions per minute and mixed for 3 minutes at 1200 revolutions per minute), then are banburied for 10 minutes at 180 ℃ through a mixer, and then are extruded and granulated.
b) The preparation method of the composition comprises the following steps: adding polyethylene resin A, polyethylene resin B and auxiliary agent master batch into a high-speed mixer (500 rpm for 1 minute and 1200 rpm for 1 minute) according to a certain proportion, then adding the mixture into a pipe production line (the specification of an extruder is that the diameter of a screw is 65mm, the length-diameter ratio is 30:1, and the processing temperature is 170 plus 210 ℃) to prepare a pipe, and processing the pipe after extrusion, wherein the processing conditions are as follows: the first step is to cool the temperature to 80 ℃ and preserve the temperature for 4 hours; secondly, cooling to 60 ℃, and preserving heat for 4 hours; and finally cooling to room temperature.
TABLE 2 polyethylene resin compositions (in parts by weight) of comparative examples 1 to 3 for water supply pipes
In the formula, the mass ratio of each component in the auxiliary master batch is as follows:
polyethylene resin a: antioxidant 1010: antioxidant 168: carbon black: polyethylene wax is 50:5:5:50: 2.
The polyethylene resin A and the polyethylene resin B are synthesized by themselves, and the adopted processes are known by persons skilled in the art and can be realized.
Performance test experiments:
the tensile properties were tested according to GB/T8804.3-2003;
testing the hydrostatic strength of the pipe according to GB/T18252-2000;
the Oxidative Induction Time (OIT) was tested in accordance with GB/T19466.6-2009, using aluminium cups, 210 ℃.
The results of the performance tests are shown in tables 3-4.
Table 3 examples 1-5 performance test results
Specification of the pipe: 110 x 10 mm.
Table 4 comparative examples 1-3 performance test results
Specification of the pipe: 110 x 10 mm.
Claims (5)
1. A water supply pipe composition characterized by: the composite material comprises the following raw materials in parts by weight:
90-95 parts of polyethylene resin A
5-10 parts of polyethylene resin B
4-6 parts of an auxiliary agent master batch;
the polyethylene resin A is a copolymer of ethylene and 1-butene or a copolymer of ethylene and 1-hexene, and has a weight average molecular weight Mw20-23 ten thousand and molecular weight distribution D of 18-23; the density is 0.941-0.947g/cm3(ii) a The melt mass flow rate under 21.6 kg load is 13.0-15.0g/10 min;
the polyethylene resin B is a copolymer of ethylene and 1-hexene, and has a weight average molecular weight Mw12-14 ten thousand and molecular weight distribution D of 2.9-3.3; the density is 0.935 to 0.940g/cm3(ii) a The mass flow rate of the melt under the load of 2.16 kilograms is 0.40 to 0.6g/10 min;
the polyethylene resin A is produced by adopting a gas phase method and a chromium catalyst;
the polyethylene resin B is produced by adopting a gas phase process and a metallocene catalyst;
the auxiliary agent master batch comprises the following raw materials in parts by weight: 50 parts of polyethylene resin A, 10105 parts of antioxidant, 1685 parts of antioxidant, 50 parts of carbon black and 2 parts of polyethylene wax;
the preparation method of the water supply pipe composition comprises the following steps:
(1) adding the polyethylene resin A, the polyethylene resin B and the auxiliary agent master batch into a high-speed mixer for mixing, and then adding the mixture into a pipe production line for extrusion, wherein the processing temperature is 170-210 ℃, so as to obtain a semi-finished pipe;
(2) crystallizing the pipe obtained after extrusion, and finally cooling to room temperature;
the conditions of the crystallization treatment are as follows: firstly, heating to 80 ℃, and preserving heat for 4 hours; and the second step is to cool the temperature to 60 ℃ and preserve the temperature for 4 hours.
2. The water supply pipe composition according to claim 1, wherein: the pressure resistance grade of the polyethylene resin A reaches PE100 grade.
3. The water supply pipe composition according to claim 1, wherein: the pressure-resistant type of the polyethylene resin B is PE-RT I type.
4. The water supply pipe composition according to claim 1, wherein: the preparation method of the auxiliary agent master batch comprises the following steps:
mixing the components at 500 rpm for 1 minute and 1200 rpm for 3 minutes, banburying the mixture at 180 ℃ for 10 minutes by a mixer, and extruding and granulating the mixture.
5. The water supply pipe composition according to claim 1, wherein: during mixing, firstly mixing for 1 minute at 500 revolutions per minute, and mixing for 1 minute at 1200 revolutions per minute; the specification of the extruder is that the diameter of a screw is 65mm, and the length-diameter ratio is 30: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910993054.5A CN112679836B (en) | 2019-10-18 | 2019-10-18 | Water supply pipe composition and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910993054.5A CN112679836B (en) | 2019-10-18 | 2019-10-18 | Water supply pipe composition and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112679836A CN112679836A (en) | 2021-04-20 |
| CN112679836B true CN112679836B (en) | 2022-04-08 |
Family
ID=75445588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910993054.5A Active CN112679836B (en) | 2019-10-18 | 2019-10-18 | Water supply pipe composition and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112679836B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115572428B (en) * | 2022-10-08 | 2023-11-21 | 江西天丰建设集团管业科技有限公司 | Water supply pipe and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103665508A (en) * | 2012-09-19 | 2014-03-26 | 中国石油化工股份有限公司 | Polyethylene composite for drip irrigation pipes |
| CN104080851A (en) * | 2011-11-23 | 2014-10-01 | 陶氏环球技术有限责任公司 | Low density ethylene-based polymers with broad molecular weight distributions and low extractables |
| CN105229042A (en) * | 2013-02-27 | 2016-01-06 | 巴塞尔聚烯烃股份有限公司 | Polyethylene process and composition thereof |
| CN108503934A (en) * | 2017-02-28 | 2018-09-07 | 中国石油化工股份有限公司 | A kind of drip irrigation pipe/belt polyethylene composition |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10563053B2 (en) * | 2015-12-21 | 2020-02-18 | Dow Quimica De Colombia S.A. | Partially-crosslinked polyethylene formulations and methods of making same |
-
2019
- 2019-10-18 CN CN201910993054.5A patent/CN112679836B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104080851A (en) * | 2011-11-23 | 2014-10-01 | 陶氏环球技术有限责任公司 | Low density ethylene-based polymers with broad molecular weight distributions and low extractables |
| EP2782959A2 (en) * | 2011-11-23 | 2014-10-01 | Dow Global Technologies LLC | Low density ethylene-based polymers with broad molecular weight distributions and low extractables |
| CN103665508A (en) * | 2012-09-19 | 2014-03-26 | 中国石油化工股份有限公司 | Polyethylene composite for drip irrigation pipes |
| CN105229042A (en) * | 2013-02-27 | 2016-01-06 | 巴塞尔聚烯烃股份有限公司 | Polyethylene process and composition thereof |
| CN108503934A (en) * | 2017-02-28 | 2018-09-07 | 中国石油化工股份有限公司 | A kind of drip irrigation pipe/belt polyethylene composition |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112679836A (en) | 2021-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101759929B (en) | High-transparency high-flowability toughened polypropylene material and preparation method thereof | |
| CN109456563B (en) | Special material for UHMWPE alloy compatibilization toughening modified polypropylene corrugated pipe and preparation method thereof | |
| CN108047552A (en) | For the blowing glass fiber reinforced polypropylene composite material and preparation method of automobile pipeline | |
| CN112745547A (en) | Thermal-oxidative-aging-resistant regenerated polyethylene material and preparation method and application thereof | |
| CN112679836B (en) | Water supply pipe composition and preparation method thereof | |
| CN109401045B (en) | Special material for high-performance functionalized alloy modified polypropylene corrugated pipe and preparation method thereof | |
| CN112795076A (en) | Special material for low-temperature-resistant polyethylene anticorrosive coating and preparation method and application thereof | |
| CN110724332B (en) | Polyethylene composition with excellent comprehensive performance for double-wall corrugated pipe and preparation method thereof | |
| CN107033433A (en) | Polyethylene anti-flaming tubular product and preparation method thereof | |
| CN111040307A (en) | Polypropylene corrugated pipe composite material and preparation method of composite polypropylene corrugated pipe | |
| CN110643106A (en) | Low-smoke halogen-free flame-retardant polyolefin oxygen-insulating layer material for cables and preparation method thereof | |
| CN114573896B (en) | High-density polyethylene double-wall corrugated pipe and preparation method and application thereof | |
| CN106554558A (en) | Easy-formation heat-proof polythene compositionss | |
| CN110724334B (en) | Heat-resistant polyethylene composition with excellent slow crack growth resistance and preparation method thereof | |
| JPS60240748A (en) | Ultra-high-molecular-weight polyethylene composition | |
| CN103087429B (en) | A kind of low-temperature impact-resistant glass fiber reinforced polypropylene composite material and Synthesis and applications thereof | |
| CN114133646A (en) | Special high-density polyethylene resin for pressure-resistant pipes and preparation method thereof | |
| CN102850752B (en) | Preparation method of flame retardant SEBS modified polycarbonate alloy material | |
| CN103183859A (en) | Polyethylene compounding composition containing mico-crosslinking component and pipe products prepared from polyethylene compounding composition | |
| JPS58210947A (en) | Steel pipe covered with resin | |
| CN106188786A (en) | A kind of eco-friendly car line 175 DEG C of cross-linking radiation CABLE MATERIALS and preparation method thereof | |
| CN112063031A (en) | HDPE steel strip spiral pipe and preparation method thereof | |
| CN117067704B (en) | High-strength high-toughness silicon core tube and preparation method thereof | |
| EP3770212A1 (en) | Butene-based polymer composition | |
| CN113929998B (en) | Polyolefin composition for rotational molding, polyolefin powder for rotational molding, and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |