CN114133646A - Special high-density polyethylene resin for pressure-resistant pipes and preparation method thereof - Google Patents
Special high-density polyethylene resin for pressure-resistant pipes and preparation method thereof Download PDFInfo
- Publication number
- CN114133646A CN114133646A CN202111611448.3A CN202111611448A CN114133646A CN 114133646 A CN114133646 A CN 114133646A CN 202111611448 A CN202111611448 A CN 202111611448A CN 114133646 A CN114133646 A CN 114133646A
- Authority
- CN
- China
- Prior art keywords
- polyethylene resin
- density polyethylene
- pressure
- pipe
- resistant
- 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.)
- Pending
Links
Classifications
-
- 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
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- 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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
Abstract
The invention provides a high-density polyethylene resin special for a pressure-resistant pipe and a preparation method thereof. The high-density polyethylene resin special for the pressure-resistant pipe is prepared by reacting the following raw materials: high-density polyethylene resin, konjac flour, stevioside, cyclohexylacetophenone, a cross-linking agent, a cross-linking auxiliary agent, a main antioxidant, an auxiliary antioxidant, a halogen absorbent and a processing auxiliary agent. The high-density polyethylene resin special for the pressure-resistant pipe has high heat resistance, high strength, high modulus and high fracture toughness, and particularly the pressure resistance required by the pipe is greatly improved, so that the pressure-resistant extensibility such as slow crack growth resistance, environmental stress cracking resistance and the like of the pipe are improved, and the application field of the pipe is widened.
Description
Technical Field
The invention belongs to the field of modification of high polymer materials, and particularly relates to a high-density polyethylene resin special for a pressure-resistant pipe and a preparation method thereof.
Background
In recent years, with the promotion of domestic shed reconstruction and the requirement for light weight of materials, polyethylene pipes are increasingly widely applied to the fields of gas transportation, water supply, pollution discharge, mine fine particle solid transportation and the like due to the outstanding excellent performances of corrosion resistance, wear resistance, no pollution to transportation media, long service life and the like. The expansion of the application field and the specialization of customer requirements require that the polyethylene pipe has better pressure-bearing capacity, rapid crack propagation resistance and slow crack growth resistance, and put forward higher requirements on the performance of the special material resin for the pipe.
The modification of high-density polyethylene to obtain high-molecular materials with better performance is a general pursuit of industrial technical development. Many attempts and efforts have been made in the prior art. CN 110092963A discloses a micro-crosslinked polyethylene pipe and a preparation method thereof, wherein a filler and a sulfur-containing silane coupling agent are added, and the sulfur-containing silane coupling agent helps the filler to be better dispersed in polyethylene base resin and is decomposed in the extrusion process to cause the base resin to be micro-crosslinked, so that the pressure resistance and the anti-draping property of the pipe are excellent, and the pipe can be used for producing large-caliber pressure-resistant pipes. But the universality of the pipe under the micro-crosslinking effect is not high.
CN 1934384 a discloses a peroxide crosslinked ethylene polymer pressure pipe and a method for manufacturing the same, wherein ethylene and at least one comonomer are polymerized by using a single-site catalyst to form a multimodal polymer, and the crosslinking by peroxide is required during the extrusion into a pipe. However, the method is mainly aimed at the application of a novel catalyst, and has high requirements on a front-end polymerization process and low universality.
CN 103756088A discloses a high-strength temperature-resistant wear-resistant polyethylene pipe, wherein a nanoscale modified ultrahigh molecular weight polyethylene and a polymer modified material of an inorganic mineral are introduced into a high-density polyethylene material to improve the overall heat-resistant and wear-resistant performance of the pipe.
Due to various limitations of polyethylene pipes produced in the prior art, the downstream application of the polyethylene pipes is greatly limited, and the research and development of the high-density polyethylene resin special for the pressure-resistant pipes has very important significance and wide market application prospect based on the current situation.
Disclosure of Invention
Aiming at the problem that the pressure resistance of the existing high-density polyethylene applied to pipes is difficult to meet the requirement, the invention aims to provide the high-density polyethylene resin special for the pressure-resistant pipes with excellent pressure resistance, which can endow the polyethylene pipes with excellent comprehensive properties such as high heat resistance, high strength, high modulus, high fracture toughness and the like, so that the pressure-resistant extension properties such as slow crack growth resistance, environmental stress cracking resistance and the like are improved, and the application field of the pipes is widened.
The invention is realized by the following technical scheme:
a high-density polyethylene resin special for pressure-resistant pipes is prepared from the following raw materials: 65-85 parts of high-density polyethylene resin, 5-15 parts of konjac flour, 3-10 parts of stevioside, 2-8 parts of cyclohexylacetophenone, 0.2-0.8 part of cross-linking agent, 0.3-0.8 part of initiator, 0.08-0.18 part of main antioxidant, 0.08-0.16 part of auxiliary antioxidant, 0.06-0.15 part of halogen absorbent, and 0.01-0.03 part of processing aid.
The invention relies on the konjac flour which is rich in hydroxyl and carbonyl functional groups and easy to crosslink, and the stevioside and the cyclohexyl acetophenone are introduced into a polyethylene macromolecular chain, on one hand, the characteristics of strong thermal stability and good antibacterial property of the konjac flour and the stevioside are brought into a polyethylene pipe, on the other hand, under the action of a crosslinking agent and an initiator, the stevioside, the cyclohexyl acetophenone and polyethylene form a copolymer, rigid benzene rings and carbonyl groups for improving intermolecular force are introduced into the polyethylene molecular chains, and the macromolecules of the copolymer are crosslinked to form a good pressure-bearing structure with compact structure, stronger bond energy, strong intermolecular force and regular structure, so that the pressure resistance of the polyethylene pipe is further improved, meanwhile, the polyethylene pipe has excellent comprehensive properties of high heat resistance, high strength, high modulus, high fracture toughness and the like, and further the pressure-resistant extensibility such as slow crack growth resistance, environmental stress cracking resistance and the like of the composite material are improved.
In the invention, the high-density polyethylene resin is in powder form, and the density is 0.946-0.954g/cm3A melt index of 0.20-0.26g/10min at 190 deg.C under 5kg pressure, a molecular weight distribution index of 30-34, and a weight average molecular weight of 28 × 104-33×104g/mol。
In the invention, the konjac flour is konjac flour, and preferably, the konjac flour has the glucomannan content of 40-70%.
In the invention, the purity of the stevioside is more than 98 percent, and the particle size is 500-4000 meshes.
In the present invention, the crosslinking agent is an organosilane crosslinking agent, preferably one or more of vinyltrimethoxysilane, vinyltriethoxysilane and vinylbis (2-methoxyethoxy) silane.
In the present invention, the initiator is a peroxide initiator, preferably one or more of dicumyl peroxide, ditert-butyl peroxide, di-tert-butylperoxyisopropyl benzene, benzoyl peroxide and 1, 3-ditert-butyl dicumyl peroxide.
In the invention, the main antioxidant is an amine antioxidant, preferably one or more of ketone-amine condensation product, secondary diarylamine and p-phenylenediamine.
In the invention, the auxiliary antioxidant is a thioester antioxidant, preferably dilauryl thiodipropionate and/or stearyl thiodipropionate.
In the invention, the halogen absorbent is calcium stearate and/or zinc stearate.
In the invention, the processing aid is a fluoroelastomer.
The invention also aims to provide a preparation method of the special high-density polyethylene resin for preparing the pressure-resistant pipe.
A preparation method of the special high-density polyethylene resin for the pressure-resistant pipe comprises the following steps:
(1) uniformly mixing high-density polyethylene resin, konjac glucomannan, stevioside, cyclohexylacetophenone, a cross-linking agent, an initiator, a main antioxidant, an auxiliary antioxidant, a halogen absorbent and a processing aid to obtain a mixed material;
(2) and extruding and granulating the mixed material to obtain the high-density polyethylene resin.
In the invention, the temperature of the extruder in the step (2) is 190-.
Still another object of the present invention is to provide a pressure-resistant high-density polyethylene pipe.
The pressure-resistant high-density polyethylene pipe is prepared from the high-density polyethylene resin or the high-density polyethylene resin prepared by the preparation method, the tensile yield stress of the pipe is 22-26MPa, the tensile fracture nominal strain is 630-670%, and the notch impact strength of a simply supported beam at 23 ℃ is 28-32kJ/m2The flexural modulus is 1130-116 MPa, the oxidation induction time AI at 210 ℃ is 79-91min, the hydrostatic strength at 20 ℃ and 12.4MPa is 210-410 h, the slow crack growth resistance at 80 ℃ and 0.92MPa is 310-410h, and the environmental stress cracking resistance is 125-163 h.
Compared with the prior art, the invention has the advantages that:
the tensile yield stress of the high-density polyethylene resin special for the technical pressure-resistant pipe is improved by 37.2 percent, the tensile fracture nominal strain is improved by 36.7 percent, the notch impact strength (23 ℃) of a simply supported beam is improved by 53.7 percent, the flexural modulus is improved by 33.3 percent, the oxidation induction time is improved by 18.0 percent, the slow crack growth resistance (80 ℃, 0.92MPa) is improved by 146.1 percent, and the environmental stress cracking resistance is improved by 245.7 percent. When the resin is used for producing the special material for the pipe, the special material has excellent comprehensive properties such as high heat resistance, high strength, high modulus, high fracture toughness and the like, has excellent pressure-resistant extensibility such as slow crack growth resistance and environmental stress cracking resistance, and can meet the production and downstream customer use requirements of high-density polyethylene pipe manufacturers.
Detailed Description
The technical solution and effects of the present invention will be further described with reference to the following embodiments.
Information of main raw materials:
the analysis and characterization method comprises the following steps:
processing equipment information:
| device name | Model number | Suppliers of goods | Function of |
| Double-screw extrusion granulator | Haake Eurolab 16 | TheimoFisher | Granulating |
Example 1
The raw materials of the high-density polyethylene resin special for the pressure-resistant pipe material comprise the following components in parts by mass: 70kg of high-density polyethylene resin-1, 10kg of konjac flour-1, 5kg of stevioside-1, 5kg of cyclohexylacetophenone, 0.3kg of vinyltrimethoxysilane, 0.3kg of dicumyl peroxide, 0.10kg of secondary diarylamine, 0.10kg of dilauryl thiodipropionate, 0.08kg of calcium stearate and 0.02kg of fluoroelastomer.
The preparation method comprises the following steps: weighing the raw materials according to the selected mass, adding the raw materials into a high-speed mixer for uniformly mixing for 2 hours at 50r/min, adding the uniformly mixed materials into a special extruder for extrusion granulation, wherein the temperature of the extruder is 180 ℃, and the rotating speed of a screw is 150r/min, so as to obtain the high-density polyethylene resin special for the pressure-resistant pipe.
Example 2
The raw materials of the high-density polyethylene resin special for the pressure-resistant pipe material comprise the following components in parts by mass: 80kg of high-density polyethylene resin-1, 15kg of konjac flour-1, 10kg of stevioside-1, 8kg of cyclohexylacetophenone, 0.6kg of vinyltrimethoxysilane, 0.6kg of dicumyl peroxide, 0.16kg of secondary diarylamine, 0.15kg of dilauryl thiodipropionate, 0.13kg of calcium stearate and 0.03kg of fluoroelastomer.
The preparation method comprises the following steps: weighing the raw materials according to the selected mass, adding the raw materials into a high-speed mixer for uniformly mixing for 2 hours at 50r/min, adding the uniformly mixed materials into a special extruder for extrusion granulation, wherein the temperature of the extruder is 200 ℃, and the rotating speed of a screw is 120r/min, so as to obtain the high-density polyethylene resin special for the pressure-resistant pipe.
Example 3
The raw materials of the high-density polyethylene resin special for the pressure-resistant pipe material comprise the following components in parts by mass: 75kg of high-density polyethylene resin-1, 13kg of konjac flour-1, 8kg of stevioside-1, 7kg of cyclohexylacetophenone, 0.5kg of vinyltriethoxysilane, 0.4kg of bis-tert-butylperoxyisopropyl benzene, 0.12kg of a ketone-amine condensation product, 0.12kg of dilauryl thiodipropionate, 0.10kg of calcium stearate, and 0.02kg of a fluoroelastomer.
The preparation method comprises the following steps: weighing the raw materials according to the selected mass, adding the raw materials into a high-speed mixer for uniformly mixing for 2 hours at 50r/min, adding the uniformly mixed materials into a special extruder for extrusion granulation, wherein the temperature of the extruder is 200 ℃, and the rotating speed of a screw is 120r/min, so as to obtain the high-density polyethylene resin special for the pressure-resistant pipe.
Example 4
The raw materials of the high-density polyethylene resin special for the pressure-resistant pipe material comprise the following components in parts by mass: 65kg of high-density polyethylene resin-1, 5kg of konjac flour-1, 3kg of stevioside-1, 2kg of cyclohexylacetophenone, 0.3kg of vinyltriethoxysilane, 0.4kg of benzoyl peroxide, 0.08kg of secondary diarylamine, 0.08kg of stearyl thiodipropionate, 0.06kg of calcium stearate, and 0.01kg of fluoroelastomer.
The preparation method comprises the following steps: weighing the raw materials according to the selected mass, adding the raw materials into a high-speed mixer for uniformly mixing for 2 hours at 50r/min, adding the uniformly mixed materials into a special extruder for extrusion granulation, wherein the temperature of the extruder is 190 ℃, and the rotating speed of a screw is 100r/min, so as to obtain the high-density polyethylene resin special for the pressure-resistant pipe.
Example 5
The raw materials of the high-density polyethylene resin special for the pressure-resistant pipe material comprise the following components in parts by mass: 83kg of high-density polyethylene resin-1, 14kg of konjac flour-1, 9kg of stevioside-1, 6kg of cyclohexylacetophenone, 0.7kg of vinylbis (2-methoxyethoxy) silane, 0.8kg of 1, 3-di-tert-butylperoxy diisopropylbenzene, 0.16kg of p-phenylenediamine, 0.15kg of stearyl thiodipropionate, 0.15kg of zinc stearate and 0.03kg of fluoroelastomer.
The preparation method comprises the following steps: weighing the raw materials according to the selected mass, adding the raw materials into a high-speed mixer for uniformly mixing for 2 hours at 50r/min, adding the uniformly mixed materials into a special extruder for extrusion granulation, wherein the temperature of the extruder is 220 ℃, and the rotating speed of a screw is 130r/min, so as to obtain the high-density polyethylene resin special for the pressure-resistant pipe.
Example 6
The raw materials of the high-density polyethylene resin special for the pressure-resistant pipe material comprise the following components in parts by mass: 70kg of high-density polyethylene resin-2, 10kg of konjac flour-2, 5kg of stevioside-2, 5kg of cyclohexylacetophenone, 0.3kg of vinyltriethoxysilane, 0.3kg of benzoyl peroxide, 0.10kg of p-phenylenediamine, 0.10kg of stearyl thiodipropionate, 0.08kg of calcium stearate and 0.02kg of fluoroelastomer.
The preparation method comprises the following steps: weighing the raw materials according to the selected mass, adding the raw materials into a high-speed mixer for uniformly mixing for 2 hours at 50r/min, adding the uniformly mixed materials into a special extruder for extrusion granulation, wherein the temperature of the extruder is 180 ℃, and the rotating speed of a screw is 150r/min, so as to obtain the high-density polyethylene resin special for the pressure-resistant pipe.
Comparative example 1
Compared with example 1, the difference is that konjaku flour, stevioside and cyclohexyl acetophenone are not added into the additive, the obtained resin has low rigidity, strength, fracture toughness and modulus, and has poor performance of resisting slow crack growth and environmental stress cracking.
The raw materials of the high-density polyethylene resin special for the pressure-resistant pipe material comprise the following components in parts by mass: 70kg of high density polyethylene resin-1, 0.3kg of vinyltrimethoxysilane, 0.3kg of dicumyl peroxide, 0.10kg of secondary diarylamine, 0.10kg of dilauryl thiodipropionate, 0.08kg of calcium stearate and 0.02kg of fluoroelastomer.
The preparation method comprises the following steps: weighing the raw materials according to the selected mass, adding the raw materials into a high-speed mixer for uniformly mixing for 2 hours at 50r/min, adding the uniformly mixed materials into a special extruder for extrusion granulation, wherein the temperature of the extruder is 180 ℃, and the rotating speed of a screw is 150r/min, so as to obtain the high-density polyethylene resin special for the pressure-resistant pipe.
Comparative example 2
Compared with example 1, the difference is that no cyclohexylacetophenone is added in the additive, the obtained resin has low rigidity, strength and modulus and poor environmental stress cracking resistance.
The raw materials of the high-density polyethylene resin special for the pressure-resistant pipe material comprise the following components in parts by mass: 70kg of high-density polyethylene resin-1, 10kg of konjac flour-1, 5kg of stevioside-1, 0.3kg of vinyltrimethoxysilane, 0.3kg of dicumyl peroxide, 0.10kg of secondary diarylamine, 0.10kg of dilauryl thiodipropionate, 0.08kg of calcium stearate and 0.02kg of fluoroelastomer.
The preparation method comprises the following steps: weighing the raw materials according to the selected mass, adding the raw materials into a high-speed mixer for uniformly mixing for 2 hours at 50r/min, adding the uniformly mixed materials into a special extruder for extrusion granulation, wherein the temperature of the extruder is 180 ℃, and the rotating speed of a screw is 150r/min, so as to obtain the high-density polyethylene resin special for the pressure-resistant pipe.
Comparative example 3
Compared with example 1, the difference is that no stevioside is added in the additive, the obtained resin has low fracture toughness and modulus and poor slow crack growth resistance.
The raw materials of the high-density polyethylene resin special for the pressure-resistant pipe material comprise the following components in parts by mass: 70kg of high-density polyethylene resin-1, 10kg of konjac flour-1, 5kg of cyclohexylacetophenone, 0.3kg of vinyltrimethoxysilane, 0.3kg of dicumyl peroxide, 0.10kg of secondary diarylamine, 0.10kg of dilauryl thiodipropionate, 0.08kg of calcium stearate, and 0.02kg of fluoroelastomer.
The preparation method comprises the following steps: weighing the raw materials according to the selected mass, adding the raw materials into a high-speed mixer for uniformly mixing for 2 hours at 50r/min, adding the uniformly mixed materials into a special extruder for extrusion granulation, wherein the temperature of the extruder is 180 ℃, and the rotating speed of a screw is 150r/min, so as to obtain the high-density polyethylene resin special for the pressure-resistant pipe.
Comparative example 4
Compared with example 1, the difference is that no konjaku flour is added into the additive, the obtained resin has low fracture toughness and poor slow crack growth resistance.
The raw materials of the high-density polyethylene resin special for the pressure-resistant pipe material comprise the following components in parts by mass: 70kg of high-density polyethylene resin-1, 5kg of stevioside-1, 5kg of cyclohexylacetophenone, 0.3kg of vinyltrimethoxysilane, 0.3kg of dicumyl peroxide, 0.10kg of secondary diarylamine, 0.10kg of dilauryl thiodipropionate, 0.08kg of calcium stearate, and 0.02kg of fluoroelastomer.
The preparation method comprises the following steps: weighing the raw materials according to the selected mass, adding the raw materials into a high-speed mixer for uniformly mixing for 2 hours at 50r/min, adding the uniformly mixed materials into a special extruder for extrusion granulation, wherein the temperature of the extruder is 180 ℃, and the rotating speed of a screw is 150r/min, so as to obtain the high-density polyethylene resin special for the pressure-resistant pipe.
Application example 1
Preparing the special material high-density polyethylene resin blends of the pressure-resistant pipes prepared in the examples 1-6 and the comparative examples 1-4 into sample bars and slices, and carrying out basic mechanical property test; the special high-density polyethylene resin blend for the pressure-resistant pipes prepared in the examples 1 to 6 and the comparative examples 1 to 4 is added with 2.5 mass percent of carbon black with the particle size range of 10nm to 25nm and is prepared by mixing
The pipe material is subjected to pipe material related performance test, and the specific test method is as follows:
the tensile property test is carried out according to the method of GB/T1040.2-2006;
the notch impact strength (23 ℃) of the simply supported beam is tested according to the requirements of the national standard GB/T1043.1-2008 impact test method;
the flexural modulus is tested according to GB/T9341-;
the oxidation induction time OTT (210 ℃) is tested according to the GB/T19466.6-2009 standard;
the hydrostatic pressure test of the pipe is tested according to GB/T6111-2003;
the slow crack growth resistance is tested according to the GB/T18476-2001 standard;
environmental stress crack resistance was tested in accordance with GB/T1842-1999.
The specific test results are shown in table 1.
TABLE 1 results of Performance test of examples 1 to 6 and comparative examples 1 to 4
As can be seen from Table 1, by comparing the test data of examples 1-6 with comparative examples 1-4, when the resin is used for producing the special material for pipe, the tensile yield stress of the high-density polyethylene pipe provided by examples 1-6 is improved by 37.2%, the tensile fracture nominal strain is improved by 36.7%, the simply supported beam notched impact strength (23 ℃) is improved by 53.7%, the bending modulus is improved by 33.3%, the oxidation induction time is improved by 18.0%, the slow crack growth resistance (80 ℃, 0.92MPa) is improved by 146.1%, the environmental stress cracking resistance is improved by 245.7%, and the high-density polyethylene resin is obviously superior to the comparative examples 1-4, so that the high-density polyethylene resin for special material for pressure-resistant pipe provided by the invention has excellent comprehensive properties such as high heat resistance, high strength, high modulus, high fracture toughness and the like, and has excellent pressure extension resistance such as slow crack growth resistance and environmental stress cracking resistance, can meet the production and downstream customer use requirements of high-density polyethylene pipe manufacturers.
The present invention is illustrated in detail by the examples described above, but the present invention is not limited to the details described above, i.e., it is not intended that the present invention be implemented by relying on the details described above. It should be understood by those skilled in the art that any modification, equivalent replacement, addition of auxiliary components, selection of specific modes and the like of the raw materials of the product of the invention can be made by those skilled in the art, but any modification, equivalent replacement, improvement and the like within the spirit and principle of the invention are within the protection scope and the disclosure scope of the invention.
Claims (7)
1. The high-density polyethylene resin special for the pressure-resistant pipe is characterized by being prepared from the following raw materials:
65-85 parts by weight of high-density polyethylene resin,
5-15 parts by weight of konjac flour,
3-10 parts by weight of stevioside,
2 to 8 parts by weight of cyclohexyl acetophenone,
0.2 to 0.8 weight portion of cross-linking agent,
0.3 to 0.8 weight portion of initiator,
0.08 to 0.18 weight portion of main antioxidant,
0.08 to 0.16 weight portion of auxiliary antioxidant,
0.06-0.15 parts by weight of halogen absorbent,
0.01-0.03 weight portion of processing aid.
2. The polyethylene resin according to claim 1, wherein the high density polyethylene resin is in powder form and has a density of 0.946 to 0.954g/cm3A melt index of 0.20-0.26g/10min at 190 deg.C under 5kg pressure, a molecular weight distribution index of 30-34, and a weight average molecular weight of 28 × 104-33×104g/mol。
3. The polyethylene resin according to claim 1, wherein the konjac flour is konjac flour, preferably konjac flour having a glucomannan content of 40% to 70%;
and/or the stevioside has the purity of more than 98 percent and the particle size of 500-4000 meshes.
4. Polyethylene resin according to claim 1, wherein the cross-linking agent is an organosilane cross-linking agent, preferably one or more of vinyltrimethoxysilane, vinyltriethoxysilane and vinylbis (2-methoxyethoxy) silane;
and/or the initiator is a peroxide initiator, preferably one or more of dicumyl peroxide, ditert-butyl peroxide, di-tert-butyl peroxyisopropylbenzene, benzoyl peroxide and 1, 3-ditert-butyl dicumyl peroxide;
and/or the primary antioxidant is an amine antioxidant, preferably one or more of a ketone-amine condensation product, a secondary diarylamine and p-phenylenediamine;
and/or the auxiliary antioxidant is a thioester antioxidant, preferably dilauryl thiodipropionate and/or octadecyl thiodipropionate;
and/or the halogen absorbent is calcium stearate and/or zinc stearate;
and/or the processing aid is a fluoroelastomer.
5. A method for preparing the high-density polyethylene resin special for the pressure-resistant pipe material according to any one of claims 1 to 4, wherein the method comprises the following steps:
(1) uniformly mixing high-density polyethylene resin, konjac glucomannan, stevioside, cyclohexylacetophenone, a cross-linking agent, an initiator, a main antioxidant, an auxiliary antioxidant, a halogen absorbent and a processing aid to obtain a mixed material;
(2) and extruding and granulating the mixed material to obtain the high-density polyethylene resin.
6. The preparation method according to claim 5, wherein the temperature of the extruder during the extrusion granulation in the step (2) is 190-.
7. A pressure-resistant high-density polyethylene pipe, which is prepared from the high-density polyethylene resin as defined in any one of claims 1-4 or the high-density polyethylene resin prepared by the preparation method as defined in claim 5 or 6, and is characterized in that the tensile yield stress of the pipe is 22-26MPa, the tensile fracture nominal strain is 630-670%, and the notched impact strength of a simply supported beam at 23 ℃ is 28-32kJ/m2The flexural modulus is 1130-116 MPa, the oxidation induction time AI at 210 ℃ is 79-91min, the hydrostatic strength at 20 ℃ and 12.4MPa is 210-410 h, the slow crack growth resistance at 80 ℃ and 0.92MPa is 310-410h, and the environmental stress cracking resistance is 125-163 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111611448.3A CN114133646A (en) | 2021-12-27 | 2021-12-27 | Special high-density polyethylene resin for pressure-resistant pipes and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111611448.3A CN114133646A (en) | 2021-12-27 | 2021-12-27 | Special high-density polyethylene resin for pressure-resistant pipes and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114133646A true CN114133646A (en) | 2022-03-04 |
Family
ID=80383432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111611448.3A Pending CN114133646A (en) | 2021-12-27 | 2021-12-27 | Special high-density polyethylene resin for pressure-resistant pipes and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114133646A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115418044A (en) * | 2022-09-30 | 2022-12-02 | 武汉金发科技有限公司 | Polyethylene composition, preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008075091A (en) * | 1998-04-22 | 2008-04-03 | Furukawa Electric Co Ltd:The | Cross-linked polyethylene pipe |
| CN102603984A (en) * | 2012-01-16 | 2012-07-25 | 南开大学 | Synthesis of high specific surface area hydroxy resin and method for extracting stevioside by high specific surface area hydroxy resin |
| CN106220960A (en) * | 2016-08-10 | 2016-12-14 | 天津华庆百胜塑业有限公司 | A kind of polyethylene modified material and preparation method thereof |
| CN111808349A (en) * | 2020-07-13 | 2020-10-23 | 万华化学集团股份有限公司 | Chemical-resistant high-density polyethylene resin and preparation method thereof |
-
2021
- 2021-12-27 CN CN202111611448.3A patent/CN114133646A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008075091A (en) * | 1998-04-22 | 2008-04-03 | Furukawa Electric Co Ltd:The | Cross-linked polyethylene pipe |
| CN102603984A (en) * | 2012-01-16 | 2012-07-25 | 南开大学 | Synthesis of high specific surface area hydroxy resin and method for extracting stevioside by high specific surface area hydroxy resin |
| CN106220960A (en) * | 2016-08-10 | 2016-12-14 | 天津华庆百胜塑业有限公司 | A kind of polyethylene modified material and preparation method thereof |
| CN111808349A (en) * | 2020-07-13 | 2020-10-23 | 万华化学集团股份有限公司 | Chemical-resistant high-density polyethylene resin and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 赵长江: "过氧化物交联高密度聚乙烯管材专用料的研究", 《精细石油化工》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115418044A (en) * | 2022-09-30 | 2022-12-02 | 武汉金发科技有限公司 | Polyethylene composition, preparation method and application thereof |
| CN115418044B (en) * | 2022-09-30 | 2023-08-08 | 武汉金发科技有限公司 | Polyethylene composition and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2798002B1 (en) | Bimodal high-density polyethylene resins and compositions with improved properties and methods of making and using the same | |
| EP1812485B1 (en) | Polyethylene molding composition for coating steel pipes | |
| CN109456563B (en) | Special material for UHMWPE alloy compatibilization toughening modified polypropylene corrugated pipe and preparation method thereof | |
| CN114133646A (en) | Special high-density polyethylene resin for pressure-resistant pipes 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 | |
| CN104845403A (en) | High-strength anti-wear high polymer material and preparation method thereof | |
| CN113667221B (en) | Polypropylene resin for waterproof coiled material production | |
| EP3467022B1 (en) | Propylene-based resin composition and injection-molded object thereof | |
| CN111100362A (en) | Bimodal polyethylene resin for large-caliber thick-wall low-sag pipe and preparation method thereof | |
| CN109535532B (en) | Production method of 1-hexene copolymerized linear polyethylene resin | |
| CN115011022A (en) | Special anti-aging 3PE anti-corrosion material and preparation method and application thereof | |
| CN111909463B (en) | High-temperature-resistant and high-air-tightness composite material for repairing thermal pipeline and preparation method and application thereof | |
| CN103183859B (en) | Polyethylene compounding composition containing mico-crosslinking component and pipe products prepared from polyethylene compounding composition | |
| CN115636995B (en) | Polyethylene resin composition, modified high-density polyethylene composite material and preparation method thereof | |
| CN113912954A (en) | High-weather-resistance ethylene propylene diene monomer composite material and preparation method and application thereof | |
| CN114456474A (en) | Thin-wall multilayer hollow blow molding material and preparation method thereof | |
| CN111378225B (en) | Auxiliary agent system for producing high impact polypropylene, preparation method and application thereof | |
| CN110003643B (en) | Anti-aging PPA composite material and preparation method thereof | |
| CN113637262A (en) | Low-temperature high-toughness PPR pipe and preparation method and application thereof | |
| CN115703904A (en) | High-heat-resistance polyethylene pipe composition and preparation method thereof | |
| CN111484736A (en) | Low-temperature-resistant reinforced PA56/PA6 composite material and preparation method thereof | |
| CN114395181B (en) | Hollow polyethylene resin and preparation method thereof | |
| KR100920513B1 (en) | Polyethylene Composite for High- Pressure Pipes | |
| CN115477829B (en) | Oil-resistant low-smoke halogen-free cable material 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 |