CN115386171A - Cold-shrink ethylene propylene diene monomer EPDM (ethylene propylene diene monomer) rubber pipe and preparation method thereof - Google Patents
Cold-shrink ethylene propylene diene monomer EPDM (ethylene propylene diene monomer) rubber pipe and preparation method thereof Download PDFInfo
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- CN115386171A CN115386171A CN202210820676.XA CN202210820676A CN115386171A CN 115386171 A CN115386171 A CN 115386171A CN 202210820676 A CN202210820676 A CN 202210820676A CN 115386171 A CN115386171 A CN 115386171A
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- 229920002943 EPDM rubber Polymers 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 33
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 22
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 20
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 20
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 14
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 14
- 229920005989 resin Polymers 0.000 claims abstract description 14
- 239000011347 resin Substances 0.000 claims abstract description 14
- 239000000314 lubricant Substances 0.000 claims abstract description 13
- 239000004945 silicone rubber Substances 0.000 claims abstract description 12
- 239000006229 carbon black Substances 0.000 claims abstract description 11
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 11
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 11
- 239000011787 zinc oxide Substances 0.000 claims abstract description 11
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 10
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 10
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000008117 stearic acid Substances 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000007822 coupling agent Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims description 65
- 150000001875 compounds Chemical class 0.000 claims description 18
- 229920001971 elastomer Polymers 0.000 claims description 16
- 229920000181 Ethylene propylene rubber Polymers 0.000 claims description 14
- 229920013716 polyethylene resin Polymers 0.000 claims description 14
- 235000019241 carbon black Nutrition 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 235000014692 zinc oxide Nutrition 0.000 claims description 10
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 7
- HLBZWYXLQJQBKU-UHFFFAOYSA-N 4-(morpholin-4-yldisulfanyl)morpholine Chemical compound C1COCCN1SSN1CCOCC1 HLBZWYXLQJQBKU-UHFFFAOYSA-N 0.000 claims description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 7
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical group [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- 238000004073 vulcanization Methods 0.000 claims description 7
- 238000004898 kneading Methods 0.000 claims description 6
- STSDHUBQQWBRBH-UHFFFAOYSA-N n-cyclohexyl-1,3-benzothiazole-2-sulfonamide Chemical compound N=1C2=CC=CC=C2SC=1S(=O)(=O)NC1CCCCC1 STSDHUBQQWBRBH-UHFFFAOYSA-N 0.000 claims description 6
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 239000002530 phenolic antioxidant Substances 0.000 claims description 2
- -1 ethylene propylene diene Chemical class 0.000 claims 5
- 238000010057 rubber processing Methods 0.000 abstract 1
- 239000003292 glue Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 8
- 239000002131 composite material Substances 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 238000010074 rubber mixing Methods 0.000 description 5
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- DEQZTKGFXNUBJL-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)cyclohexanamine Chemical compound C1CCCCC1NSC1=NC2=CC=CC=C2S1 DEQZTKGFXNUBJL-UHFFFAOYSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
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
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- 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
- C08L2207/066—LDPE (radical process)
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a cold-contraction ethylene propylene diene monomer EPDM (ethylene propylene diene monomer) rubber pipe and a preparation method thereof, and relates to the technical field of rubber processing. The cold-contraction ethylene propylene diene monomer EPDM rubber pipe comprises the following raw materials in parts by mass: 100-200 parts of ethylene propylene diene monomer, 5-10 parts of low-density polyethylene resin, 5-10 parts of silicone rubber, 5-8 parts of vulcanizing agent, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 5-10 parts of silicon dioxide, 1-3 parts of carbon black, 1-3 parts of lubricant, 1-3 parts of antioxidant, 1-3 parts of coupling agent and 1-5 parts of accelerator. The cold-contraction ethylene propylene diene monomer EPDM rubber pipe prepared by the invention has the characteristics of high temperature resistance and low cost.
Description
Technical Field
The invention belongs to the technical field of rubber pipe processing, and particularly relates to a cold-shrinkage ethylene propylene diene monomer EPDM rubber pipe and a preparation method thereof.
Background
The cold-shrink sleeve is widely applied to the fields of power cables, communication cables and the like, and the materials commonly used for the cold-shrink sleeve at present are silicon rubber and ethylene propylene diene monomer rubber. The ethylene propylene diene monomer has poor high and low temperature resistance, is easy to generate phenomena of aging, cracking and the like in the long-term operation process of a cable at the high temperature of 90 ℃, has poor shrinkage performance in a low-temperature environment of-20 ℃ and below than that of silicon rubber, cannot play a role in sealing, waterproofing and the like, has excellent high and low temperature resistance and good shrinkage performance, but has higher price of raw materials. At present, the performance of the cold-shrink tube prepared by combining ethylene propylene diene monomer rubber and silicon rubber is still lower than that of a silicon rubber cold-shrink tube.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a cold-shrinkage ethylene propylene diene monomer EPDM rubber pipe and a preparation method thereof. The cold-shrinkable tube is prepared by combining ethylene propylene diene monomer, low-density polyethylene resin and silicon rubber with an auxiliary agent, the performance of the cold-shrinkable tube prepared by the invention is higher than that of a silicon rubber cold-shrinkable tube, and the processing cost is reduced.
The cold-shrink ethylene propylene diene monomer EPDM rubber pipe comprises the following raw materials in parts by mass:
100-200 parts of ethylene propylene diene monomer, 5-10 parts of low-density polyethylene resin, 5-10 parts of silicone rubber, 5-8 parts of vulcanizing agent, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 5-10 parts of silicon dioxide, 1-3 parts of carbon black, 1-3 parts of lubricant, 1-3 parts of antioxidant, 1-3 parts of coupling agent and 1-5 parts of accelerator.
Preferably, the lubricant is sodium stearate. The accelerator is formed by mixing 4,4' -dithiodimorpholine and N-cyclohexyl-2-benzothiazole sulfonamide according to the molar ratio of 1:1-3, and the vulcanizing agent is formed by mixing sulfur and dicumyl peroxide.
Preferably, the antioxidant is at least one of a phenolic antioxidant or a benzimidazole antioxidant.
Preferably, the low density polyethylene resin has a melt index of 1 to 5.0g/10min.
Preferably, the coupling agent is a silane coupling agent.
The preparation method of the cold-contraction ethylene propylene diene monomer EPDM rubber pipe comprises the following steps:
(1) Mixing ethylene propylene diene monomer, zinc oxide, stearic acid, silicon dioxide and carbon black in proportion, putting into an internal mixer, and mixing for 30-60min at the temperature of 120-160 ℃ to obtain ethylene propylene rubber compound;
(2) Proportionally mixing low-density polyethylene resin and silicon rubber, putting into a kneader, kneading and mixing for 30-45min at the temperature of 130-150 ℃ to obtain silicon rubber/polyethylene resin rubber compound;
(3) Mixing ethylene propylene rubber compound, silicone rubber/polyethylene resin compound, vulcanizing agent, lubricant, antioxidant, accelerator and coupling agent, putting into an open mill, mixing uniformly, thinly passing through a sheet, cutting to prepare blended rubber material, and extruding the blended rubber material into a pipe by an extruder;
(4) Vulcanizing, namely heating and pressurizing the pipe under inert atmosphere for vulcanization treatment;
(5) And (3) performing expansion molding treatment, namely expanding the vulcanized pipe by expansion equipment, and supporting and shaping the liner by a spiral plastic supporting pipe to prepare the cold-shrinkage ethylene propylene diene monomer EPDM rubber pipe.
Compared with the prior art, the invention has the following beneficial effects:
the invention uses the ethylene propylene diene monomer, the low-density polyethylene resin, the silicon rubber, the vulcanizing agent, the zinc oxide, the stearic acid, the silicon dioxide, the carbon black, the lubricant, the antioxidant, the accelerator and the coupling agent as raw materials, so that the prepared cold-shrink tube has excellent temperature resistance and good retraction performance, simultaneously reduces the usage amount of the silicon rubber and greatly reduces the processing cost of the cold-shrink tube.
Detailed Description
The present invention is further illustrated by the following examples.
Example 1
A preparation method of a cold-contraction ethylene propylene diene monomer EPDM rubber pipe comprises the following specific steps:
(1) Mixing 150 parts by weight of ethylene propylene diene monomer, 5 parts by weight of zinc oxide, 1 part by weight of stearic acid, 8 parts by weight of silicon dioxide and 2 parts by weight of carbon black in proportion, putting into an internal mixer, and mixing for 50min at the temperature of 130 ℃ to obtain ethylene propylene rubber compound;
(2) Mixing 6 parts by weight of low-density polyethylene resin and 8 parts by weight of silicon rubber in proportion, putting the mixture into a kneader, and kneading and mixing the mixture for 30min at the temperature of 140 ℃ to obtain silicon rubber/polyethylene resin rubber compound;
(3) Mixing ethylene propylene rubber mixing glue and silicone rubber/polyethylene resin mixing glue, adding 2 parts by weight of sulfur, 3 parts by weight of dicumyl peroxide, 3.5 parts by weight of a composite accelerator (formed by mixing 4,4' -dithiodimorpholine and N-cyclohexyl-2-benzothiazole sulfonamide according to the molar ratio of 1:2), 2 parts by weight of a lubricant (sodium stearate), 1.5 parts by weight of an antioxidant (phenol antioxidant) and 2 parts by weight of a silane coupling agent, uniformly mixing, putting into an open mill, uniformly mixing, thinly discharging sheets, cutting to prepare a blending glue stock, and extruding the blending glue stock into a pipe through an extruder;
(4) Vulcanizing, namely heating and pressurizing the pipe under inert atmosphere for vulcanization treatment;
(5) And (3) performing expansion molding treatment, namely expanding the vulcanized pipe by expansion equipment, and supporting and shaping the liner by a spiral plastic supporting pipe to prepare the cold-shrinkage ethylene propylene diene monomer EPDM rubber pipe.
Example 2
A preparation method of a cold-contraction ethylene propylene diene monomer EPDM rubber pipe comprises the following specific steps:
(1) Mixing 120 parts by weight of ethylene propylene diene monomer, 6 parts by weight of zinc oxide, 1.6 parts by weight of stearic acid, 10 parts by weight of silicon dioxide and 3 parts by weight of carbon black in proportion, putting the mixture into an internal mixer, and mixing for 30min at the temperature of 145 ℃ to obtain ethylene propylene rubber compound;
(2) Mixing 10 parts by weight of low-density polyethylene resin and 6 parts by weight of silicone rubber in a ratio, putting the mixture into a kneader, and kneading and mixing for 45min at the temperature of 135 ℃ to obtain silicone rubber/polyethylene resin rubber compound;
(3) Mixing ethylene propylene rubber mixing glue and silicone rubber/polyethylene resin mixing glue, adding 2.5 parts by weight of sulfur, 3.2 parts by weight of dicumyl peroxide, 3.0 parts by weight of composite accelerator (formed by mixing 4,4' -dithiodimorpholine and N-cyclohexyl-2-benzothiazole sulfonamide according to the molar ratio of 1:1), 1 part by weight of lubricant (sodium stearate), 1 part by weight of antioxidant (benzimidazole antioxidant) and 1 part by weight of silane coupling agent, uniformly mixing, putting into an open mill, uniformly mixing, thinly discharging sheets, cutting to prepare a blending glue stock, and extruding the blending glue stock into a pipe by an extruder;
(4) Vulcanizing, namely heating and pressurizing the pipe under inert atmosphere for vulcanization treatment;
(5) And (3) performing expansion molding treatment, namely expanding the vulcanized pipe by expansion equipment, and supporting and shaping the liner by a spiral plastic supporting pipe to prepare the cold-shrinkage ethylene propylene diene monomer EPDM rubber pipe.
Example 3
A preparation method of a cold-contraction ethylene propylene diene monomer EPDM rubber pipe comprises the following specific steps:
(1) Mixing 180 parts by weight of ethylene propylene diene monomer, 5 parts by weight of zinc oxide, 1.8 parts by weight of stearic acid, 6.5 parts by weight of silicon dioxide and 1 part by weight of carbon black in proportion, putting into an internal mixer, and mixing for 60min at the temperature of 150 ℃ to obtain ethylene propylene rubber compound;
(2) 5.5 parts by weight of low-density polyethylene resin and 10 parts by weight of silicon rubber are mixed according to a proportion, put into a kneader and kneaded and mixed for 30min at the temperature of 150 ℃ to obtain silicon rubber/polyethylene resin rubber compound;
(3) Mixing ethylene propylene rubber mixing gum and silicone rubber/polyethylene resin mixing gum, adding 2.8 parts by weight of sulfur, 4 parts by weight of dicumyl peroxide, 2.5 parts by weight of a composite accelerator (formed by mixing 4,4' -dithiodimorpholine and N-cyclohexyl-2-benzothiazole sulfonamide according to a molar ratio of 1:3), 1 part by weight of a lubricant (sodium stearate), 3 parts by weight of an antioxidant (benzimidazole antioxidant) and 2 parts by weight of a silane coupling agent, uniformly mixing, putting into an open mill, uniformly mixing, thinly discharging sheets, cutting to prepare a blended rubber material, and extruding the blended rubber material into a pipe through an extruder;
(4) Vulcanizing, namely heating and pressurizing the pipe under inert atmosphere for vulcanization treatment;
(5) And (3) performing expansion molding treatment, namely expanding the vulcanized pipe by expansion equipment, and supporting and shaping the liner by a spiral plastic supporting pipe to prepare the cold-shrinkage ethylene propylene diene monomer EPDM rubber pipe.
Example 4
A preparation method of a cold-contraction ethylene propylene diene monomer EPDM rubber pipe comprises the following specific steps:
(1) Mixing 160 parts by weight of ethylene propylene diene monomer, 5 parts by weight of zinc oxide, 1.3 parts by weight of stearic acid, 8 parts by weight of silicon dioxide and 1 part by weight of carbon black in proportion, putting the mixture into an internal mixer, and mixing for 60min at the temperature of 155 ℃ to obtain ethylene propylene rubber compound;
(2) Mixing 10 parts by weight of low-density polyethylene resin and 10 parts by weight of silicon rubber in proportion, putting the mixture into a kneader, and kneading and mixing for 45min at the temperature of 145 ℃ to obtain silicon rubber/polyethylene resin rubber compound;
(3) Mixing ethylene propylene rubber mixing glue and silicone rubber/polyethylene resin mixing glue, adding 2 parts by weight of sulfur, 3.8 parts by weight of dicumyl peroxide, 3.3 parts by weight of a composite accelerator (formed by mixing 4,4' -dithiodimorpholine and N-cyclohexyl-2-benzothiazole sulfenamide according to the molar ratio of 1:2), 2 parts by weight of a lubricant (sodium stearate), 3 parts by weight of an antioxidant (benzimidazole-type antioxidant) and 3 parts by weight of a silane coupling agent, uniformly mixing, putting into an open mill, uniformly mixing, thinly discharging sheets, cutting to prepare a blending glue stock, and extruding the blending glue stock into a pipe through an extruder;
(4) Vulcanizing, namely heating and pressurizing the pipe under inert atmosphere for vulcanization treatment;
(5) And (3) performing expansion molding treatment, namely expanding the vulcanized pipe by expansion equipment, and supporting and shaping the liner by a spiral plastic supporting pipe to prepare the cold-shrinkage ethylene propylene diene monomer EPDM rubber pipe.
Example 5
A preparation method of a cold-contraction ethylene propylene diene monomer EPDM rubber pipe comprises the following specific steps:
(1) Mixing 200 parts by weight of ethylene propylene diene monomer, 6 parts by weight of zinc oxide, 8.5 parts by weight of silicon dioxide and 3 parts by weight of carbon black in proportion, putting into an internal mixer, and mixing for 60min at the temperature of 155 ℃ to obtain ethylene propylene rubber compound;
(2) Mixing 7 parts by weight of low-density polyethylene resin and 10 parts by weight of silicon rubber in proportion, putting the mixture into a kneader, and kneading and mixing the mixture for 30min at the temperature of 132 ℃ to obtain silicon rubber/polyethylene resin rubber compound;
(3) Mixing ethylene propylene rubber mixing gum and silicone rubber/polyethylene resin mixing gum, adding 2.8 parts by weight of sulfur, 3.5 parts by weight of composite accelerator (formed by mixing 4,4' -dithiodimorpholine and N-cyclohexyl-2-benzothiazole sulfonamide according to the molar ratio of 1:2), 3.6 parts by weight of dicumyl peroxide, 3 parts by weight of lubricant (sodium stearate), 3 parts by weight of antioxidant (phenol antioxidant) and 1 part by weight of silane coupling agent, uniformly mixing, putting into an open mill, uniformly mixing, thinly discharging sheets, cutting to prepare a blended rubber material, and extruding the blended rubber material into a pipe through an extruder;
(4) Vulcanizing, namely heating and pressurizing the pipe under inert atmosphere for vulcanization treatment;
(5) And (3) performing expansion molding treatment, namely expanding the vulcanized pipe by expansion equipment, and supporting and shaping the liner by a spiral plastic supporting pipe to prepare the cold-shrinkage ethylene propylene diene monomer EPDM rubber pipe.
The performance of the cold-shrinkable ethylene propylene diene monomer EPDM rubber pipe prepared in the embodiments 1-5 is detected, and the temperature resistance of the cold-shrinkable ethylene propylene diene monomer EPDM rubber pipe is improved by 10-15% compared with the cold-shrinkable pipe prepared by only using silicon rubber.
It should be noted that the above-mentioned embodiments are merely examples of the present invention, and it is obvious that the present invention is not limited to the above-mentioned embodiments, and other modifications are possible. All modifications directly or indirectly derivable by a person skilled in the art from the present disclosure are to be considered within the scope of the present invention.
Claims (6)
1. A cold-contraction ethylene propylene diene monomer EPDM rubber pipe is characterized by comprising the following raw materials in parts by mass:
100-200 parts of ethylene propylene diene monomer, 5-10 parts of low-density polyethylene resin, 5-10 parts of silicone rubber, 5-8 parts of vulcanizing agent, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 5-10 parts of silicon dioxide, 1-3 parts of carbon black, 1-3 parts of lubricant, 1-3 parts of antioxidant, 1-3 parts of coupling agent and 1-5 parts of accelerator.
2. The cold shrink ethylene propylene diene EPDM rubber tubing of claim 1, wherein the lubricant is sodium stearate; the accelerator is prepared by mixing 4,4' -dithiodimorpholine and N-cyclohexyl-2-benzothiazole sulfonamide according to the molar ratio of 1:1-3, and the vulcanizing agent is prepared by mixing sulfur and dicumyl peroxide.
3. The cold-shrink ethylene propylene diene EPDM rubber tubing of claim 1, wherein the antioxidant is at least one of a phenolic antioxidant or a benzimidazole type antioxidant.
4. The cold-shrink ethylene propylene diene EPDM rubber tubing of claim 1, wherein the low density polyethylene resin has a melt index of 1-5.0g/10min.
5. The cold-shrink ethylene propylene diene EPDM rubber tubing of claim 1, wherein the coupling agent is a silane coupling agent.
6. The method for preparing the cold-shrink ethylene propylene diene EPDM rubber pipe material according to any one of the claims 1 to 5, which is characterized by comprising the following steps:
(1) Mixing ethylene propylene diene monomer, zinc oxide, stearic acid, silicon dioxide and carbon black in proportion, putting into an internal mixer, and mixing for 30-60min at the temperature of 120-160 ℃ to obtain ethylene propylene rubber compound;
(2) Proportionally mixing low-density polyethylene resin and silicon rubber, putting into a kneader, kneading and mixing for 30-45min at the temperature of 130-150 ℃ to obtain silicon rubber/polyethylene resin rubber compound;
(3) Mixing ethylene propylene rubber compound, silicone rubber/polyethylene resin compound, vulcanizing agent, lubricant, antioxidant, accelerator and coupling agent, putting into an open mill, mixing uniformly, thinly passing through a sheet, cutting to prepare blended rubber material, and extruding the blended rubber material into a pipe by an extruder;
(4) Vulcanizing, namely heating and pressurizing the pipe under inert atmosphere for vulcanization treatment;
(5) And (3) performing expansion molding treatment, namely expanding the vulcanized pipe by expansion equipment, and supporting and shaping the liner by a spiral plastic supporting pipe to prepare the cold-shrinkage ethylene propylene diene monomer EPDM rubber pipe.
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