CN110607023A - Insulating shielding layer rubber material for cable and manufacturing method thereof - Google Patents
Insulating shielding layer rubber material for cable and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
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- 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
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The application particularly relates to an insulation shielding layer rubber material for a cable and a manufacturing method thereof, wherein the rubber material comprises the following components in parts by weight: 75-105 parts of EVM; 8-12 parts of chlorinated polyethylene 135B; 65-90 parts of carbon black; 4-12 parts of light calcium carbonate; 1-2 parts of an antioxidant; 0.8-1.2 parts of barium stearate; 12-18 parts of engine oil; 5-10 parts of solid paraffin; 1-3 parts of a vulcanizing agent; 1-5 parts of a vulcanization assistant. The insulating shielding layer rubber material for the cable has excellent conductivity, the volume resistivity is not more than 105 omega cm, the tensile strength is high and can reach more than 18 MPa; the mineral oil and fuel oil resistance is not expanded; no smell of penetrating nose; the insulating color does not migrate with the insulating color, the strippability is good, and the use and the installation of products are facilitated.
Description
Technical Field
The application relates to the field of rubber materials, in particular to an insulation shielding layer rubber material for a cable and a manufacturing method thereof.
Background
The cable of the shield machine for mining requires that the insulation shielding layer has excellent conductivity and the volume resistivity is not more than 105Omega cm; the mineral oil and fuel oil resistance is not expanded; the insulating color does not migrate with the insulating color, and the strippability is good. The traditional shielding layer material taking natural styrene-butadiene or chloroprene rubber as a main component has excellent conductivity, but has poor oil resistance, the colors of the shielding layer and the insulating layer are mutually transferred, and the shielding layer is difficult to peel off, so that the use and installation of the product are influenced.
Disclosure of Invention
The insulating and shielding layer rubber material for the cable is excellent in conductivity, high in tensile strength, resistant to expansion of mineral oil and fuel oil, free of mutual migration with insulating color and good in strippability.
In order to achieve the above object, the present application provides an insulation shielding layer rubber material for cables, comprising, by weight:
in the above technical solution, further, the composition comprises, by weight:
in the above technical solution, further, the composition comprises, by weight:
in the above technical solution, further, the carbon black includes acetylene black and highly wear-resistant carbon black.
In the technical scheme, the acetylene black accounts for 40-60 parts by weight; the weight part of the high wear-resistant carbon black is 25-30 parts;
in the above technical solution, further, the vulcanization aid is TAIC.
In the above technical solution, further, the vulcanizing agent is DCP.
In the above technical solution, further, the EVM is EVM 400.
In the above technical scheme, further, the antioxidant is antioxidant 300#。
In the above technical solution, further, the engine oil is specifically 20#And (4) engine oil.
In addition, the application also provides a manufacturing method of the insulation shielding layer rubber material for the cable, which comprises the following steps:
step one, putting EVM, chlorinated polyethylene 135B, an antioxidant, barium stearate, carbon black, engine oil, solid paraffin and light calcium carbonate into an internal mixer mixing chamber in batches in sequence, mixing, pressurizing for a period of time and lifting; discharging the glue after reaching the preset temperature;
putting the rubber obtained in the step one into an open mill, rolling and smoothing the rubber, then discharging the rubber, and storing the rubber for a period of time at normal temperature;
thirdly, putting the rubber obtained in the second step into an internal mixer again, pressurizing, putting a vulcanizing agent and a vulcanizing assistant, pressurizing for a period of time, and lifting; then, discharging the glue;
and step four, putting the rubber obtained in the step three into the open mill again, pressurizing, rolling and smoothing, and then discharging the sheet.
In the above technical solution, further, the step one specifically includes the following steps:
step 1, putting EVM and chlorinated polyethylene 135B into an internal mixing chamber for internal mixing, pressurizing for a period of time and lifting;
step 2, adding an antioxidant and barium stearate, pressurizing for a period of time and lifting;
step 3, adding engine oil and half of carbon black, pressurizing for a period of time, and lifting;
step 4, adding the remaining half of the carbon black and the solid paraffin, pressurizing for a period of time, and lifting;
step 5, adding light calcium carbonate, pressurizing for a period of time, and lifting;
and 6, discharging the glue after the preset temperature is reached.
In the above technical solution, further, the method comprises the following steps:
s01, putting the EVM and the chlorinated polyethylene 135B into an internal mixing chamber of an internal mixer for internal mixing; pressurizing for 2-3 minutes and lifting, wherein the pressure of the compressed air is 6.5-7.5 kg/cm2；
S02, adding an antioxidant and barium stearate; pressurizing for 1 minute and lifting, wherein the pressure of the compressed air is 6.5-7.5 kg/cm2。
S03, adding engine oil and one half of carbon black, pressurizing for 2-3 minutes, and lifting with the pressure of compressed air of 6.5-7.5 kg/cm2；
S04, adding the rest half of carbon black and solid paraffin, pressurizing for 1-2 minutes, and lifting with the pressure of compressed air of 6.5-7.5 kg/cm2；
S05, adding light calcium carbonate, pressurizing for 2-3 minutes, and lifting with the pressure of compressed air of 6.5-7.5 kg/cm2(ii) a Discharging the glue when the temperature reaches 120-130 ℃;
s06, putting the rubber obtained in the step S05 into an open mill, adjusting the temperature of front and rear rollers to 60-70 ℃, the roller spacing to be 1mm or less, carrying out thin passing for 1-2 times, wrapping 2-3 triangular bags, adjusting the roller spacing to 6-8 mm, rolling, discharging sheets after smoothing, and storing for more than 24 hours at normal temperature;
s07, putting the rubber obtained in the S06 into the internal mixer again, and pressurizing the rubber with the pressure of compressed air of 6.5-7.5 kg/cm2(ii) a When the temperature reaches 60-70 ℃, adding a vulcanizing agent and a vulcanizing assistant, pressurizing for 30-40 seconds, and then lifting, wherein the pressure of compressed air is 6.5-7.5 kg/cm2(ii) a Removing glue;
s08, adjusting the roll spacing of the open mill to 6-8 mm, placing the rubber obtained in the step S07 into the open mill at the temperature of 60-70 ℃ of front and rear rolls, packaging the rubber into a triangular bag for two to three times after accumulation glue is formed on a roller, and then discharging the rubber.
The insulating shielding layer rubber material for the cable has excellent conductivity, the volume resistivity is not more than 105 omega cm, the tensile strength is high and can reach more than 18 MPa; the mineral oil and fuel oil resistance is not expanded; no smell of penetrating nose; the insulating color does not migrate with the insulating color, the strippability is good, and the use and the installation of products are facilitated.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to examples.
The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.
As described in the background section, the insulation shielding layer of the shield tunneling machine cable in the prior art uses natural styrene-butadiene or chloroprene rubber as a main component, and has the disadvantages of poor oil resistance, color mutual migration between the shielding layer and the insulation layer, and difficult peeling of the shielding layer.
In order to solve the problem, the application provides an insulation shielding layer rubber material for a cable, which comprises the following components in parts by weight: 75-105 parts of EVM; 135B 8-12 parts of chlorinated polyethylene; 65-90 parts of carbon black; 4-12 parts of light calcium carbonate; 1-2 parts of an antioxidant; 0.8-1.2 parts of barium stearate; 12-18 parts of engine oil; 5-10 parts of solid paraffin; 1-3 parts of a vulcanizing agent; 1-5 parts of a vulcanization assistant.
The insulating shielding layer rubber material for the cable has excellent conductivity, the volume resistivity is not more than 105 omega cm, the tensile strength is high and can reach more than 18 MPa; the mineral oil and fuel oil resistance is not expanded; no smell of penetrating nose; the insulating color does not migrate with the insulating color, the strippability is good, and the use and the installation of products are facilitated.
In some embodiments, the carbon black is a mixture of acetylene carbon black and highly abrasion resistant carbon black. Specifically, the acetylene black accounts for 40-60 parts by weight of the total material; the weight part of the high wear-resistant carbon black is 25-30 parts;
in some embodiments, the vulcanization aid is TAIC. TAIC refers to triallyl isocyanurate.
In some embodiments, the vulcanizing agent is DCP. Among them, DCP, dicumylperoxide and dicumylperoxide, are strong oxidizing agents.
In some embodiments, the EVM is embodied as EVM 400. Among them, EVM means an ethylene-vinyl acetate copolymer having excellent aging resistance, excellent weathering/ozone/ultraviolet ray resistance, low compression set at high temperature and good processability.
In some embodiments, the antioxidant is antioxidant 300#. Antioxidant 300#The antioxidant is a typical thiobisphenol antioxidant, is used as a hindered phenol main antioxidant, has double functions of a free radical terminator and a hydroperoxide decomposer due to the structural particularity, shows excellent synergistic effect when being used together with carbon black, and is selected as the high-efficiency main antioxidant.
In some embodiments, the engine oil is specifically 20#And (4) engine oil.
According to another aspect of the application, the method for manufacturing the insulating shielding layer rubber material for the cable mainly comprises the steps of mixing, vulcanizing, pressing and discharging.
Specifically, the method comprises the following steps:
s01, putting the EVM and the chlorinated polyethylene 135B into an internal mixing chamber of an internal mixer for internal mixing; pressurizing for 2-3 minutes and lifting, wherein the pressure of the compressed air is 6.5-7.5 kg/cm2；
S02, adding an antioxidant and barium stearate; pressurizing for 1 minute and lifting, wherein the pressure of the compressed air is 6.5-7.5 kg/cm2。
S03, adding engine oil and one half of carbon black, pressurizing for 2-3 minutes, and lifting with the pressure of compressed air of 6.5-7.5 kg/cm2；
S04, adding the rest half of carbon black and solid paraffin, pressurizing for 1-2 minutes, and lifting with the pressure of compressed air of 6.5-7.5 kg/cm2；
S05, adding light calcium carbonate, pressurizing for 2-3 minutes, lifting, and compressing air pressureThe force is 6.5 to 7.5kg/cm2(ii) a Discharging the glue when the temperature reaches 120-130 ℃;
s06, putting the rubber obtained in the step S05 into an open mill, adjusting the temperature of front and rear rollers to 60-70 ℃, the roller spacing to be 1mm or less, carrying out thin passing for 1-2 times, wrapping 2-3 triangular bags, adjusting the roller spacing to 6-8 mm, rolling, discharging sheets after smoothing, and storing for more than 24 hours at normal temperature;
s07, putting the rubber obtained in the S06 into the internal mixer again, and pressurizing the rubber with the pressure of compressed air of 6.5-7.5 kg/cm2(ii) a When the temperature reaches 60-70 ℃, adding a vulcanizing agent and a vulcanizing assistant, pressurizing for 30-40 seconds, and then lifting, wherein the pressure of compressed air is 6.5-7.5 kg/cm2(ii) a Removing glue;
s08, adjusting the roll spacing of the open mill to 6-8 mm, placing the rubber obtained in the step S07 into the open mill at the temperature of 60-70 ℃ of front and rear rolls, packaging the rubber into a triangular bag for two to three times after accumulation glue is formed on a roller, and then discharging the rubber.
The following examples further illustrate the advantageous effects of the present application.
Example 1
The insulation shielding layer rubber material for the cable provided by the embodiment comprises the following components in parts by weight: 75 parts of EVM; chlorinated polyethylene 135B12 parts; 40 parts of acetylene black; 30 parts of high wear-resistant carbon black; 8 parts of light calcium carbonate; 2 parts of an antioxidant; 1 part of barium stearate; 18 parts of engine oil; 5 parts of solid paraffin; 2 parts of a vulcanizing agent; and 3 parts of a vulcanization aid.
The rubber is prepared by combining the components in the proportion of the embodiment according to the manufacturing method of the rubber material of the insulation shielding layer for the cable.
Wherein the rubber has the following extrusion technological parameters in an XJW-150+90+70 continuous sulfur rubber extruder: the temperature of a machine head is 65-75 ℃; the temperature of the machine body is 60-65 ℃; the temperature of the screw is 50-60 ℃; saturated steam pressure is 0.8-1.2 MPa; the extrusion speed is 2.5-6 m/min.
Example 2
The insulation shielding layer rubber material for the cable provided by the embodiment comprises the following components in parts by weight: 95 parts of EVM; chlorinated polyethylene 135B8 parts; 60 parts of acetylene black; 25 parts of high wear-resistant carbon black; 12 parts of light calcium carbonate; 1 part of an antioxidant; 0.8 part of barium stearate; 12 parts of engine oil; 9 parts of solid paraffin; 2.5 parts of a vulcanizing agent; and 2 parts of a vulcanization aid.
The rubber is prepared by combining the components in the proportion of the embodiment according to the manufacturing method of the rubber material of the insulation shielding layer for the cable.
Example 3
The insulation shielding layer rubber material for the cable provided by the embodiment comprises the following components in parts by weight: 105 portions of EVM; chlorinated polyethylene 135B9 parts; 48 parts of acetylene black; 28 parts of high wear-resistant carbon black; 4 parts of light calcium carbonate; 1 part of an antioxidant; 1 part of barium stearate; 14 parts of engine oil; 10 parts of solid paraffin; 1 part of a vulcanizing agent; and 4 parts of a vulcanization aid.
The rubber is prepared by combining the components in the proportion of the embodiment according to the manufacturing method of the rubber material of the insulation shielding layer for the cable.
Example 4
The insulation shielding layer rubber material for the cable provided by the embodiment comprises the following components in parts by weight: 85 parts of EVM; 10.5 parts of chlorinated polyethylene 135B; 53 parts of acetylene black; 26 parts of high wear-resistant carbon black; 10 parts of light calcium carbonate; 2 parts of an antioxidant; 1 part of barium stearate; 15 parts of engine oil; 7 parts of solid paraffin; 2 parts of a vulcanizing agent; and 5 parts of a vulcanization aid.
The rubber is prepared by combining the components in the proportion of the embodiment according to the manufacturing method of the rubber material of the insulation shielding layer for the cable.
Example 5
The insulation shielding layer rubber material for the cable provided by the embodiment comprises the following components in parts by weight: 90 parts of EVM; chlorinated polyethylene 135B10 parts; 50 parts of acetylene black; 27 parts of high wear-resistant carbon black; 5 parts of light calcium carbonate; 1.5 parts of an antioxidant; 0.8 part of barium stearate; 15 parts of engine oil; 8 parts of solid paraffin; 2 parts of a vulcanizing agent; and 2 parts of a vulcanization aid.
The rubber is prepared by combining the components in the proportion of the embodiment according to the manufacturing method of the rubber material of the insulation shielding layer for the cable.
Comparative example 1
Certain brand insulating shielding layer rubber material with natural butylbenzene as main component
Comparative example 2
Insulating shielding layer rubber material of certain brand using chloroprene rubber as main component
Experiment one
Examples 1 to 5 and comparative examples 1 to 2 were directly measured with respect to the virgin tensile strength and the virgin elongation at break K of the rubber material. The results of the experiment are shown in table 1:
TABLE 1 results of the experiments
Experiment two
On the basis of experiment one, examples 1 to 5 and comparative examples 1 to 2 relate to rubber materials, which were placed in an environment of 75 ℃ and subjected to aging for 240 hours, and then the tensile strength change rate and the elongation at break change rate were measured, respectively. The results of the experiment are shown in table 2:
TABLE 2 results of experiment two
Experiment three
On the basis of the first experiment, the rubber materials of examples 1 to 5 and comparative examples 1 to 2 were dipped in oil at 100 ℃ for 24 hours, and then the tensile strength change rate and the elongation at break change rate were measured. The results of the experiment are shown in table 3:
TABLE 3 results of the three experiments
Experiment four
The semiconductive peeling force and the volume resistivity of the rubber materials of examples 1 to 5 and comparative examples 1 to 2 were directly measured. The results of the experiment are shown in table 4:
TABLE 4 results of the experiment
As can be seen from tables 1-4, compared with the prior art, the insulating shielding layer rubber material for the cable provided by the application has the advantages of excellent conductivity, volume resistivity not greater than 105 Ω & cm, high tensile strength which can reach more than 18 MPa; the mineral oil and fuel oil resistance is not expanded; the strippability is good, and the use and the installation of products are facilitated.
The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the technical principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (13)
1. An insulation shielding layer rubber material for a cable is characterized by comprising the following components in parts by weight:
2. the insulation shielding layer rubber material for the cable according to claim 1, comprising by weight:
3. the insulation shielding layer rubber material for the cable according to claim 2, characterized by comprising, in parts by weight:
4. an insulation shield rubber material for cables as claimed in any one of claims 1 to 3, wherein said carbon black comprises acetylene black and highly abrasion-resistant carbon black.
5. The insulation shielding layer rubber material for cable according to claim 4, wherein the acetylene black is 40 to 60 parts by weight; the weight portion of the high wear-resistant carbon black is 25-30.
6. The insulation shield rubber material for cables as claimed in any one of claims 1 to 3, wherein said vulcanization aid is TAIC.
7. An insulation shield rubber material for cable according to any one of claims 1 to 3, wherein said vulcanizing agent is DCP.
8. The insulation shield rubber material for cables as claimed in any one of claims 1 to 3, wherein said EVM is EVM 400.
9. The insulation shield rubber material for cable according to any one of claims 1 to 3, wherein the antioxidant is antioxidant 300#。
10. An insulation shield rubber material for cable according to any one of claims 1 to 3, wherein said engine oil is 20#And (4) engine oil.
11. A method of manufacturing an insulation shield rubber material for cables according to any one of claims 1 to 10, comprising the steps of:
step one, putting EVM, chlorinated polyethylene 135B, an antioxidant, barium stearate, carbon black, engine oil, solid paraffin and light calcium carbonate into an internal mixer mixing chamber in batches in sequence, mixing, pressurizing for a period of time and lifting;
putting the rubber obtained in the step one into an open mill, rolling and smoothing the rubber, then discharging the rubber, and storing the rubber for a period of time at normal temperature;
thirdly, putting the rubber obtained in the second step into an internal mixer again, pressurizing, putting a vulcanizing agent and a vulcanizing assistant, pressurizing for a period of time, and lifting; then, discharging the glue;
and step four, putting the rubber obtained in the step three into the open mill again, pressurizing, rolling and smoothing, and then discharging the sheet.
12. The method for manufacturing an insulation shielding layer rubber material for a cable according to claim 11, wherein the first step specifically comprises the steps of:
step 1, putting EVM and chlorinated polyethylene 135B into an internal mixing chamber for internal mixing, pressurizing for a period of time and lifting;
step 2, adding an antioxidant and barium stearate, pressurizing for a period of time and lifting;
step 3, adding engine oil and half of carbon black, pressurizing for a period of time, and lifting;
step 4, adding the remaining half of the carbon black and the solid paraffin, pressurizing for a period of time, and lifting;
step 5, adding light calcium carbonate, pressurizing for a period of time, and lifting;
and 6, discharging the glue after the preset temperature is reached.
13. The method for manufacturing an insulation shield rubber material for a cable according to claim 12, comprising the steps of:
s01, putting the EVM and the chlorinated polyethylene 135B into an internal mixing chamber of an internal mixer for internal mixing; pressurizing for 2-3 minutes and lifting, wherein the pressure of the compressed air is 6.5-7.5 kg/cm2；
S02, adding an antioxidant and barium stearate; pressurizing for 1 minute and lifting, wherein the pressure of the compressed air is 6.5-7.5 kg/cm2。
S03, adding engine oil and one half of carbon black, pressurizing for 2-3 minutes, and lifting with the pressure of compressed air of 6.5-7.5 kg/cm2；
S04, adding the rest half of carbon black and solid paraffin, pressurizing for 1-2 minutes, and lifting with the pressure of compressed air of 6.5-7.5 kg/cm2；
S05, adding light calcium carbonate, pressurizing for 2-3 minutes, and liftingThe compressed air pressure is 6.5-7.5 kg/cm2(ii) a Discharging the glue when the temperature reaches 120-130 ℃;
s06, putting the rubber obtained in the step S05 into an open mill, adjusting the temperature of front and rear rollers to 60-70 ℃, the roller spacing to be 1mm or less, carrying out thin passing for 1-2 times, wrapping 2-3 triangular bags, adjusting the roller spacing to 6-8 mm, rolling, discharging sheets after smoothing, and storing for more than 24 hours at normal temperature;
s07, putting the rubber obtained in the S06 into the internal mixer again, and pressurizing the rubber with the pressure of compressed air of 6.5-7.5 kg/cm2(ii) a When the temperature reaches 60-70 ℃, adding a vulcanizing agent and a vulcanizing assistant, pressurizing for 30-40 seconds, and then lifting, wherein the pressure of compressed air is 6.5-7.5 kg/cm2(ii) a Removing glue;
s08, adjusting the roll spacing of the open mill to 6-8 mm, placing the rubber obtained in the step S07 into the open mill at the temperature of 60-70 ℃ of front and rear rolls, packaging the rubber into a triangular bag for two to three times after accumulation glue is formed on a roller, and then discharging the rubber.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114539663A (en) * | 2022-04-18 | 2022-05-27 | 尚纬股份有限公司 | Ethylene cable, strippable semiconductive insulation shielding material and preparation method |
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Application publication date: 20191224 |