CN118146637A - Wide-temperature-range salt-spray-corrosion-resistant silicon rubber insulating sheath and preparation method thereof - Google Patents
Wide-temperature-range salt-spray-corrosion-resistant silicon rubber insulating sheath and preparation method thereof Download PDFInfo
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- 229920002379 silicone rubber Polymers 0.000 title claims abstract description 47
- 238000005260 corrosion Methods 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 229920002545 silicone oil Polymers 0.000 claims abstract description 58
- 239000000203 mixture Substances 0.000 claims abstract description 40
- 150000003839 salts Chemical class 0.000 claims abstract description 34
- 230000007797 corrosion Effects 0.000 claims abstract description 33
- 239000007921 spray Substances 0.000 claims abstract description 33
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003063 flame retardant Substances 0.000 claims abstract description 28
- 239000000945 filler Substances 0.000 claims abstract description 27
- -1 polydimethylsiloxane Polymers 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 18
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 18
- 229920001971 elastomer Polymers 0.000 claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000004073 vulcanization Methods 0.000 claims abstract description 14
- 239000006229 carbon black Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims description 31
- JJQZDUKDJDQPMQ-UHFFFAOYSA-N dimethoxy(dimethyl)silane Chemical compound CO[Si](C)(C)OC JJQZDUKDJDQPMQ-UHFFFAOYSA-N 0.000 claims description 20
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 20
- 239000004945 silicone rubber Substances 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 19
- 238000004898 kneading Methods 0.000 claims description 17
- 239000004114 Ammonium polyphosphate Substances 0.000 claims description 10
- 235000019826 ammonium polyphosphate Nutrition 0.000 claims description 10
- 229920001276 ammonium polyphosphate Polymers 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 10
- 239000000049 pigment Substances 0.000 claims description 10
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 8
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 8
- 229920002554 vinyl polymer Polymers 0.000 claims description 8
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 7
- 239000000347 magnesium hydroxide Substances 0.000 claims description 7
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 7
- VLCLHFYFMCKBRP-UHFFFAOYSA-N tricalcium;diborate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]B([O-])[O-].[O-]B([O-])[O-] VLCLHFYFMCKBRP-UHFFFAOYSA-N 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000007822 coupling agent Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- YEECOJZAMZEUBB-UHFFFAOYSA-N 2,2,3,3,6,6,7,7-octamethyloctane Chemical group CC(C)(C)C(C)(C)CCC(C)(C)C(C)(C)C YEECOJZAMZEUBB-UHFFFAOYSA-N 0.000 claims description 2
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 2
- 239000000779 smoke Substances 0.000 abstract description 4
- 239000002861 polymer material Substances 0.000 abstract description 2
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
- 229910021485 fumed silica Inorganic materials 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N methyl pentane Natural products CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 229910018557 Si O Inorganic materials 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
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- 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
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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- 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
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- 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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
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- 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
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
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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
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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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
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- Chemical Kinetics & Catalysis (AREA)
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- Organic Insulating Materials (AREA)
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Abstract
The invention belongs to the technical field of organic synthesis and high polymer materials, and particularly relates to a wide-temperature-range salt-fog-corrosion-resistant silicon rubber insulating sheath and a preparation method thereof. The wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath comprises the following raw materials: vinyl-terminated polydimethylsiloxane rubber, modified silicone oil, white carbon black, a vulcanization composition and a flame-retardant filler. The wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath has excellent smoke corrosion resistance and flame retardance, and solves the problem that the traditional silicon rubber insulating sheath cannot be used in coastal areas for a long time.
Description
Technical Field
The invention belongs to the technical field of organic synthesis and high polymer materials, and particularly relates to a wide-temperature-range salt-fog-corrosion-resistant silicon rubber insulating sheath and a preparation method thereof.
Background
The main chain of the vinyl silicone rubber molecule is polydimethylsiloxane, the glass transition temperature is minus 100 ℃, the Si-O bond energy is 443KJ/mol, and the vinyl silicone rubber molecule is a high bond energy chemical bond which is inferior to the fluorocarbon bond (C-F) bond energy (484 KJ/mol), and has very good ultraviolet resistance. The silicon rubber has the characteristics of excellent high and low temperature resistance, weather resistance, hydrophobicity, electrical insulation, physiological inertia and the like after high-temperature vulcanization, is widely applied to the field of high-voltage insulation, has stable performance at-60 ℃ to 200 ℃ for a long time, and can be used at high temperature for a long time. In addition, the silicon rubber has good flame retardance, but does not reach FV0 level, shows flame retardance and self-extinguishing property, and needs to be added with flame retardant. In coastal areas, the air humidity is high, the salt fog content is high, and the existing silicon rubber insulating sheath can not meet the use requirements of the areas.
Disclosure of Invention
The invention aims to provide a wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath and a preparation method thereof, which solve the problem that the traditional silicon rubber insulating sheath cannot be used for a long time in coastal areas.
The invention provides one of the following technical schemes:
the wide-temperature-range salt-spray-corrosion-resistant silicon rubber insulating sheath comprises the following raw materials in parts by weight:
90-100 parts of vinyl-terminated polydimethylsiloxane rubber, 10-30 parts of modified silicone oil, 20-60 parts of white carbon black, 3-9 parts of vulcanized composition and 8-90 parts of flame retardant filler.
Further, the modified silicone oil is prepared by uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil according to the weight ratio of 1:2 at 100-200 ℃.
Further, the vulcanizing composition consists of a vulcanizing agent: coupling agent = 1-3:2-6 weight ratio.
Further, the vulcanizing agent is2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide; the coupling agent is an organotin compound modified silane coupling agent.
Further, the flame-retardant filler is a composition of any one or more of aluminum hydroxide, magnesium hydroxide, calcium borate and ammonium polyphosphate and pigment; wherein, when the aluminum hydroxide, the magnesium hydroxide, the calcium borate and the ammonium polyphosphate are used in combination, the proportion of any component of the aluminum hydroxide, the magnesium hydroxide and the calcium borate to the ammonium polyphosphate is 2:1.
Further, the molecular weight of the vinyl-terminated polydimethylsiloxane rubber is 500000-800000g/mol, and the vinyl content is 2% -3.00%; the particle size of the white carbon black is 10-20nm.
Further, the molecular weight of the vinyl-terminated polydimethylsiloxane rubber was 600000g/mol, and the vinyl content was 3%.
Further, the flame retardant filler contains 1-10 parts of pigment.
The invention provides a second technical scheme as follows:
A preparation method of a wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath comprises the following operation steps:
(1) Preparation of modified silicone oil
Uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at the weight ratio of 1:2 at 100-200 ℃ to obtain modified silicone oil;
(2) According to the weight parts, the modified silicone oil prepared in the step (1) and the vinyl polydimethylsiloxane rubber and the white carbon black are put into a kneader for kneading and mixing to form a mass;
(3) Heating, mixing, and cooling to room temperature;
(4) And continuously adding the flame retardant filler, kneading uniformly, taking out, adding the vulcanized composition, uniformly mixing, vulcanizing at a high temperature, and performing two-stage vulcanization.
Further, the stirring temperature in the step (1) is 150 ℃; the temperature rise temperature of the step (3) is 60-80 ℃, and the mixing period is 10-30 minutes.
Further, the step (4) of two-stage vulcanization is continued at 200℃for 12 hours.
The invention has the beneficial effects that:
The silicone rubber insulating sheath has good smoke corrosion resistance and can be used for a long time in coastal areas. The silicone rubber insulating sheath is composed of raw materials of vinyl-terminated polydimethylsiloxane rubber, modified silicone oil, white carbon black, a vulcanization composition and flame-retardant filler, wherein the modified silicone oil is prepared from dimethyl dimethoxy silane and hydroxyl silicone oil in a specific weight ratio, and is used as a structure regulator, so that a more uniform structure regulating function can be provided.
Detailed Description
In order to clearly illustrate the technical characteristics of the scheme, the invention is explained in detail by the following specific embodiments. The scope of the present invention is not limited to the following examples. Those skilled in the art will appreciate that various changes and modifications can be made to the invention without departing from the spirit and scope thereof.
The instruments, reagents, materials, etc. used in the examples described below are conventional instruments, reagents, materials, etc. known in the art, and are commercially available. The experimental methods, detection methods, and the like in the examples described below are conventional experimental methods, detection methods, and the like that are known in the prior art unless otherwise specified. Parts, percentages, etc., referred to in the examples below are weight units unless otherwise indicated.
The compositions of the raw materials of the examples of the present invention are shown in Table 1 below.
Example 1
The raw materials of the wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath comprise the following components, wherein the modified silicone oil is prepared by uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at 160 ℃ according to a ratio of 1:2;
The vulcanizing composition consists of 2 parts by weight of 2, 5-dimethyl-2, 5-di-t-butylperoxy hexane and 4 parts by weight of gamma-aminopropyl triethoxysilane (KH-550) mixed;
The flame retardant filler is prepared from aluminum hydroxide: ammonium polyphosphate = 2:1 weight ratio of flame retardant filler, and 4 parts by weight of pigment was added.
The preparation method of the wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath comprises the following steps:
(1) Uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil according to the weight ratio of 1:2 at 160 ℃ to obtain modified silicone oil, and then putting the modified silicone oil, vinyl-terminated polydimethylsiloxane rubber and fumed silica into a kneader, and kneading and mixing to form a group;
(2) Heating to 75 ℃, mixing for 20 minutes, and cooling to room temperature;
(3) Continuously adding the prepared flame-retardant filler, kneading uniformly, taking out, adding the vulcanized composition, uniformly thin-pass mixing, vulcanizing at a high temperature of 170 ℃, and performing two-stage vulcanization at 200 ℃ for 12 hours.
Example 2
The raw materials of the wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath comprise the following components, wherein the modified silicone oil is prepared by uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at the temperature of 140 ℃ according to the ratio of 1:2;
the vulcanizing composition consists of 1 part by weight of 2, 5-dimethyl-2, 5-di-tert-butylperoxy hexane and 3 parts by weight of gamma-aminopropyl triethoxysilane (KH-550) mixed;
The flame retardant filler is prepared from calcium borate: the flame retardant filler consists of ammonium polyphosphate=2:1 weight ratio, and 4 weight parts of pigment color paste is added.
The preparation method of the wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath comprises the following steps:
(1) The modified silicone oil obtained by uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at 140 ℃ according to the ratio of 1:2, vinyl-terminated polydimethylsiloxane rubber and meteorological white carbon black are put into a kneader to be kneaded and mixed into a group;
(2) The temperature is 80 ℃, the mixing period is 15 minutes, and the mixture is cooled to room temperature;
(3) Continuously adding the prepared flame-retardant filler, kneading uniformly, taking out, adding the vulcanized composition, uniformly mixing, vulcanizing at a high temperature of 170 ℃ and performing secondary vulcanization at 200 ℃ for 12 hours.
Example 3
The raw materials of the wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath comprise the following components, wherein the modified silicone oil is prepared by uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at the temperature of 150 ℃ according to the ratio of 1:2;
The vulcanizing composition consists of 2 parts by weight of 2, 5-dimethyl-2, 5-di-t-butylperoxy hexane and 6 parts by weight of gamma-aminopropyl triethoxysilane (KH-550) mixed;
the flame retardant filler is prepared from magnesium hydroxide: ammonium polyphosphate = 2:1 weight ratio, and 8 parts by weight of pigment paste.
The preparation method of the wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath comprises the following steps:
(1) Uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil according to the weight ratio of 1:2 at 150 ℃ to obtain modified silicone oil, and then putting the modified silicone oil and vinyl-terminated polydimethylsiloxane rubber and fumed silica into a kneader for kneading and mixing to form a group;
(2) The temperature is raised to 70 ℃, the mixing period is 25 minutes, and the mixture is cooled to room temperature;
(3) Continuously adding the prepared flame-retardant filler, kneading uniformly, taking out, adding the vulcanized composition, uniformly mixing, vulcanizing at a high temperature of 170 ℃ and performing secondary vulcanization at 200 ℃ for 12 hours.
Example 4
The raw materials of the wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath comprise the following components, wherein the modified silicone oil is prepared by uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at the temperature of 180 ℃ according to the ratio of 1:2;
The vulcanizing composition consists of 2 parts by weight of 2, 5-dimethyl-2, 5-di-t-butylperoxy hexane and 6 parts by weight of gamma-aminopropyl triethoxysilane (KH-550) mixed;
The flame retardant filler is prepared from aluminum hydroxide: ammonium polyphosphate = 2:1 weight ratio of flame retardant filler, and 3 parts by weight of pigment was added.
The preparation method of the wide-temperature-range salt spray corrosion-resistant silicon rubber insulating sheath comprises the following steps:
(1) Uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil according to the weight ratio of 1:2 at 180 ℃ to obtain modified silicone oil, and then putting the modified silicone oil and vinyl-terminated polydimethylsiloxane rubber and fumed silica into a kneader for kneading and mixing to form a group;
(2) The temperature is raised to 60 ℃, the mixing period is 30 minutes, and the mixture is cooled to room temperature;
(3) Continuously adding the prepared flame-retardant filler, kneading uniformly, taking out, adding the vulcanized composition, uniformly mixing, vulcanizing at a high temperature of 170 ℃ and performing secondary vulcanization at 200 ℃ for 12 hours.
Comparative example 1
A silicon rubber insulating sheath has the raw material composition shown in table 1. Wherein the modified silicone oil is prepared by uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at 60 ℃ according to a ratio of 1:2;
The vulcanizing composition consists of 2 parts by weight of 2, 5-dimethyl-2, 5-di-t-butylperoxy hexane and 6 parts by weight of gamma-aminopropyl triethoxysilane (KH-550) mixed;
The flame retardant filler contained 2 parts by weight of pigment.
The preparation method comprises the following steps:
(1) The modified silicone oil obtained by uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at the temperature of 60 ℃ according to the ratio of 1:2, vinyl-terminated polydimethylsiloxane rubber and fumed silica are put into a kneader for kneading and mixing to form a group;
(2) The temperature is 75 ℃, the mixing period is 20 minutes, and the mixture is cooled to room temperature;
(3) Continuously adding the flame retardant filler, kneading uniformly, taking out, adding the vulcanized composition, uniformly mixing, vulcanizing at a high temperature of 170 ℃ and performing two-stage vulcanization at 200 ℃ for 12 hours.
Comparative example 2
A silicon rubber insulating sheath has the raw material composition shown in table 1. Wherein the modified silicone oil is prepared by uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at 170 ℃ according to a ratio of 1:2;
The vulcanizing composition consists of 2 parts by weight of 2, 5-dimethyl-2, 5-di-t-butylperoxy hexane and 6 parts by weight of gamma-aminopropyl triethoxysilane (KH-550) mixed;
The flame retardant filler contained 2 parts by weight of pigment.
The preparation method comprises the following steps:
(1) The modified silicone oil obtained by uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at 170 ℃ according to the ratio of 1:2, vinyl-terminated polydimethylsiloxane rubber and fumed silica are put into a kneader for kneading and mixing to form a group;
(2) The temperature is 75 ℃, the mixing period is 20 minutes, and the mixture is cooled to room temperature;
(3) Continuously adding the flame retardant filler, kneading uniformly, taking out, adding the vulcanized composition, uniformly mixing, vulcanizing at a high temperature of 170 ℃ and performing two-stage vulcanization at 200 ℃ for 12 hours.
Comparative example 3
A silicon rubber insulating sheath has the raw material composition shown in table 1. Wherein,
The vulcanizing composition consists of 2 parts by weight of 2, 5-dimethyl-2, 5-di-t-butylperoxy hexane and 6 parts by weight of gamma-aminopropyl triethoxysilane (KH-550) mixed; the flame retardant filler contained 3 parts by weight of pigment.
The preparation method comprises the following steps:
(1) Directly mixing dimethyl dimethoxy silane and hydroxy silicone oil according to a ratio of 1:2, and putting the mixture and vinyl-terminated polydimethylsiloxane rubber and fumed silica into a kneader for kneading and mixing to form a group;
(2) The temperature is 75 ℃, the mixing period is 20 minutes, and the mixture is cooled to room temperature;
(3) Continuously adding the flame retardant filler, kneading uniformly, taking out, adding the vulcanized composition, uniformly mixing, vulcanizing at a high temperature of 170 ℃ and performing two-stage vulcanization at 200 ℃ for 12 hours.
Comparative example 4
The silicone rubber insulating sheath comprises the following raw materials in percentage by weight as in example 1:1.
Comparative example 5
The silicone rubber insulating sheath comprises the following raw materials in percentage by weight as in example 2:1.
Comparative example 6
A silicone rubber insulating sheath, raw material composition, amount and preparation method are as in example 3, except that the vulcanized composition is composed of 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide and gamma-aminopropyl triethoxysilane (KH-550) mixed in a weight ratio of 4:7.
Comparative example 7
A silicon rubber insulating sheath changes the dosage of modified silicone oil only based on the composition and preparation of the raw material of comparative example 1.
The silicone rubber insulating sheaths prepared in the above examples and comparative examples were tested for hardness, tensile strength, elongation at break, high and low temperature resistance and salt spray corrosion resistance. Salt spray experiment standard is referred to GB/T1771-2007. The test results are shown in Table 2 below.
TABLE 2
As can be seen from the results of table 2, the silicone rubber insulation protective sleeves prepared in the examples of the present invention have excellent smoke corrosion resistance. The comparative examples 1 and 2 caused significant decrease in salt spray corrosion resistance after reducing the amount of modified silicone oil, the salt spray corrosion could only reach 300 hours, and the service life in salt spray environment was shortened by 57%; however, when the maximum amount of modified silicone oil required in comparative example 7 is increased, the mechanical properties are lowered, the salt spray corrosion resistance is greatly lowered, and the excellent structure adjusting function cannot be exerted. The preparation step of the modified silicone oil is changed in the comparative example 3, the dimethyl dimethoxy silane and the hydroxy silicone oil are directly mixed with other raw materials according to the required dosage without heating and stirring, the structure adjusting function of the silicone oil is not reflected, the salt spray corrosion can only reach 350 hours, and the service life in a salt spray environment is shortened by 50%; after the proportion of the components of the modified silicone oil in the comparative example 4 and the modified silicone oil in the comparative example 5 is changed, even if the mixing preparation at the required temperature is carried out, the obtained modified silicone oil serving as a structure regulator cannot continuously play a key role in adjusting the overall structure of the silicone rubber insulating sheath, so that the salt spray corrosion resistance is obviously reduced, the salt spray corrosion can only reach 200 hours, and the service life in a salt spray environment is shortened by 71%. Comparative example 6 the weight ratio of the two components was changed without changing the amount of the vulcanizing composition, and the high and low temperature resistance and the salt spray corrosion resistance were significantly reduced. From the analysis, the raw material composition and the preparation method in the silicone rubber insulation protective sleeve play a key role in the performance of the silicone rubber insulation protective sleeve, and the advantages of other performance indexes are still obvious on the premise of ensuring the smoke corrosion resistance effect.
The above description is only an example of the present application, and the scope of the present application is not limited to the specific examples, but is defined by the claims of the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the technical idea and principle of the present application should be included in the protection scope of the present application.
Claims (9)
1. The wide-temperature-range salt spray corrosion resistant silicon rubber insulating sheath is characterized by comprising the following raw materials: vinyl-terminated polydimethylsiloxane rubber, modified silicone oil, white carbon black, a vulcanization composition and a flame-retardant filler; the modified silicone oil is prepared by mixing dimethyl dimethoxy silane and hydroxyl silicone oil according to a certain weight ratio.
2. The wide-temperature-range salt spray corrosion resistant silicone rubber insulating sheath according to claim 1, wherein the modified silicone oil is prepared by uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at a weight ratio of 1:2 at 100-200 ℃.
3. The broad temperature range salt spray corrosion resistant silicone rubber insulation jacket of claim 1, wherein the vulcanizing composition is composed of a vulcanizing agent: coupling agent = 1-3:2-6 weight ratio.
4. The broad temperature range salt spray corrosion resistant silicone rubber insulation jacket of claim 3, wherein the vulcanizing agent is 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide, and the coupling agent is an organotin compound modified silane coupling agent.
5. The broad temperature range salt spray corrosion resistant silicone rubber insulation jacket of claim 1, wherein the flame retardant filler is a combination of any one or more of aluminum hydroxide, magnesium hydroxide, calcium borate, ammonium polyphosphate and pigment; wherein, when the aluminum hydroxide, the magnesium hydroxide, the calcium borate and the ammonium polyphosphate are used in combination, the proportion of any component of the aluminum hydroxide, the magnesium hydroxide and the calcium borate to the ammonium polyphosphate is 2:1.
6. The broad temperature range salt spray corrosion resistant silicone rubber insulation jacket of claim 1, wherein said vinyl terminated polydimethylsiloxane rubber has a molecular weight of 500000-800000g/mol and a vinyl content of 2-3.00%; the particle size of the white carbon black is 10-20nm.
7. The wide-temperature-range salt spray corrosion resistant silicone rubber insulating sheath according to claim 1, wherein the raw materials comprise the following components in parts by weight:
90-100 parts of vinyl-terminated polydimethylsiloxane rubber, 10-30 parts of modified silicone oil, 20-60 parts of white carbon black, 3-9 parts of vulcanized composition and 8-90 parts of flame retardant filler.
8. A method for preparing the wide temperature range salt spray corrosion resistant silicone rubber insulation sheath according to any one of claims 1-7, comprising the following steps:
(1) Preparation of modified silicone oil
Uniformly stirring dimethyl dimethoxy silane and hydroxyl silicone oil at the weight ratio of 1:2 at 100-200 ℃ to obtain modified silicone oil;
(2) According to the weight parts, the modified silicone oil prepared in the step (1) and the vinyl polydimethylsiloxane rubber and the white carbon black are put into a kneader for kneading and mixing to form a mass;
(3) Heating, mixing, and cooling to room temperature;
(4) And continuously adding the flame retardant filler, kneading uniformly, taking out, adding the vulcanized composition, uniformly mixing, vulcanizing at a high temperature, and performing two-stage vulcanization.
9. The method for preparing a wide temperature range salt spray corrosion resistant silicone rubber insulation sheath according to claim 8, wherein the stirring temperature in step (1) is 150 ℃; the temperature rise temperature of the step (3) is 60-80 ℃, and the mixing period is 10-30 minutes.
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