CN113402993A - Ceramic silicone rubber composite belt with mica layer and preparation method thereof - Google Patents
Ceramic silicone rubber composite belt with mica layer and preparation method thereof Download PDFInfo
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- CN113402993A CN113402993A CN202110660523.9A CN202110660523A CN113402993A CN 113402993 A CN113402993 A CN 113402993A CN 202110660523 A CN202110660523 A CN 202110660523A CN 113402993 A CN113402993 A CN 113402993A
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Abstract
The invention relates to a ceramic silicon rubber composite belt with a mica layer and a preparation method thereof, wherein the composite belt has a three-layer structure and is prepared by the following steps: firstly, preparing a ceramic silicon rubber sheet, then preparing a self-adhesive silicon rubber sheet, and finally cold pressing the mica tape subjected to surface treatment, the ceramic silicon rubber sheet and the self-adhesive silicon rubber sheet, and performing irradiation crosslinking to prepare the ceramic silicon rubber composite tape with the mica layer in the middle. The composite tape containing the three-layer structure has excellent high-temperature resistance, flame retardance, mechanical strength and bonding performance, can be widely applied to the wire and cable industry, and greatly improves the use safety of cables.
Description
Technical Field
The invention relates to the field of ceramic silicon rubber composite belts. In particular to a ceramic silicon rubber composite belt with a mica layer and a preparation method thereof.
Background
With the rapid development of social economy and the improvement of living standard of people, large supermarkets, hospitals and high-rise buildings are pulled out, and if fire disasters happen in the large places, serious safety accidents can be caused. In the process of fire accidents, how to ensure the smoothness of the circuit and enable the fire fighting equipment to normally operate is of great importance, so that more time is provided for firefighters to rescue trapped people and reduce property loss. As is known, the electric wires and cables used in some important places are gradually transited from common cables to fire-resistant and flame-retardant cables, and at present, two types of fire-resistant cables are more common at home and abroad: one is a mica tape lapped fire-resistant cable, and the other is a mineral insulation fire-resistant cable. Although the mica tape lapped fire-resistant cable is low in production cost, the mica tape lapped fire-resistant cable needs to be wound in multiple layers and pulverized after combustion, and the fire-resistant effect is poor due to serious shedding; the mineral insulation fire-resistant cable is complex in process, high in production cost and not beneficial to large-scale wide application.
People are dedicated to searching for a wire and cable protective material which can be widely used, has low production cost and good flame retardant effect, and the ceramic silicon rubber material is distinguished by excellent performances in all aspects. In recent years, there have been many studies on ceramic silicone rubber refractories. Chinese patent CN104310937B researches the influence of the particle size and the proportion of calcium carbonate on the related properties of the ceramic silicon rubber. Researches show that calcium carbonate with different particle sizes is used as a ceramic forming filler, carbon dioxide bubbles with different sizes can be generated at high temperature, the release of the bubbles and the ceramic formation are promoted to occur simultaneously, the integrity of the ceramic structure is ensured, and the ceramic strength is improved. Chinese patent CN202473445U prepares a ceramic silicon rubber fireproof composite belt. The composite belt is prepared from an upper layer of ceramic silicon rubber and a lower layer of ceramic silicon rubber and glass fiber cloth positioned between the two layers, wherein the middle reinforcing layer is the glass fiber cloth. The ceramic silicon rubber composite belt can be applied to an insulating layer or a fire-resistant layer of a cable, and has the advantages of simple production process and lower cost. However, with the development of research, people also gradually find that the ceramic structure generated by the ceramic silicon rubber can isolate flame and has a fireproof effect, but the heat insulation effect is not ideal, and if the excessive temperature cannot be dissipated timely, smoldering can be changed into combustion, and finally adverse results are caused. Chinese patent CN203250584U discloses a composite fire-resistant cable, i.e. a layer of mica tape is wrapped outside the conductor, and then a layer of ceramic silicon rubber composite tape is wrapped outside the conductor. The design can fully utilize the good heat insulation performance of the mica tape and the water-resisting and shock-resisting characteristics of the ceramic silicon rubber, fully play the advantages of the mica tape and the ceramic silicon rubber, and greatly improve the safety performance of the cable. However, the situation that the mica tape and the ceramic silicon rubber are not tightly wound inevitably occurs in the wrapping process, and gaps exist between layers, so that certain potential safety hazards exist.
Disclosure of Invention
Aiming at the technical defects in the prior art, the invention aims to solve the technical problem of the interface between layers when the ceramic silicon rubber and the mica tape are used simultaneously. The surface of the mica tape is treated to have unsaturated double bonds, and then the silicone rubber and the mica tape are crosslinked, so that the interface problem of the two materials is solved.
The second technical problem to be solved by the invention is to improve the strength and the flame retardant effect of the silicon rubber composite belt. The mica tape is used as the reinforcing layer, so that the strength of the composite tape can be further improved, and the mica tape is used as the heat insulation layer, so that the defect that the ceramic silicon rubber is not ideal in heat insulation effect can be overcome, the heat dissipation is accelerated, and the potential safety hazard is avoided.
The invention also adopts irradiation crosslinking to replace vulcanization crosslinking, avoids adding vulcanizing agent, simplifies production process, improves production efficiency, and is suitable for large-scale production of the ceramic silicone rubber composite belt with the mica layer in the middle.
The invention provides a preparation method of a ceramic silicon rubber composite belt with a mica layer in the middle.
The specific technical scheme of the invention is as follows:
(1) preparation of the ceramic silicone rubber sheet: mixing raw silicon rubber on a double-roll open mill in a room temperature environment until the silicon rubber is coated with a roll, adding a reinforcing agent and a structure control agent to be uniformly mixed, adding a porcelain forming filler and a melting auxiliary agent to continue mixing, and finally passing through a thin lower sheet to obtain a silicon rubber sheet with the thickness of 0.1-2 mm;
(2) preparation of self-adhesive silicone rubber sheet: mixing raw silicon rubber on a double-roll open mill in a room temperature environment until the silicon rubber is wrapped by a roll, adding a reinforcing agent, a structure control agent and a flame retardant to be uniformly mixed, adding a tackifier to continue mixing, and finally passing through a thin lower sheet to obtain a self-adhesive silicon rubber sheet with the thickness of 0.5-1 mm;
according to the invention, the thickness dimension between the three layers is controlled, so that the flame retardance, heat insulation and water resistance are met, and the integral application effect is optimized;
(3) and (3) laminating the mica tape and the silicone rubber sheet: carrying out surface treatment on the mica tape by using a silane coupling agent to enable the surface of the mica tape to have unsaturated double bonds, and then pressing the mica tape together with ceramic silicon rubber and self-adhesive silicon rubber by using a cold pressing process to obtain a sample with a three-layer structure; the thickness of the mica tape is preferably 0.2-1 mm;
(4) preparing a composite tape by irradiation: and (4) carrying out irradiation crosslinking on the sample obtained in the step (3) by using an irradiation source such as gamma rays or electron beams, and efficiently producing the ceramic silicone rubber composite belt with the mica layer in the middle.
Further, the silicone rubber in the step (1) is one or more of dimethyl silicone rubber, methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber and fluorine silicone rubber; the porcelain forming filler is one or more of mica, montmorillonite, wollastonite, aluminum hydroxide, calcium carbonate and kaolin; the melting auxiliary agent is one or more of low-melting-point glass powder, zinc borate and boron oxide; the reinforcing agent is one or more of fumed silica and precipitated silica; the structure control agent is one or more of hydroxyl silicone oil and high vinyl silicone oil; the raw materials in the step (1) are as follows in parts by weight: 70-100 parts of silicon rubber; 10-40 parts of porcelain forming filler; 1-20 parts of a melting auxiliary agent; 20-50 parts of reinforcing agent; 0.1-5 parts of structure control agent.
Further, the silicone rubber in the step (2) is one or more of dimethyl silicone rubber, methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber; the tackifier is one or more of rosin pentaerythritol ester, tripropyl borate, rosin glycerol ester and tetradecyl borate; the reinforcing agent is one or more of fumed silica and precipitated silica; the structure control agent is one or more of hydroxyl silicone oil and high vinyl silicone oil; the flame retardant is one or more of aluminum hydroxide, zinc borate, antimony trioxide and ammonium polyphosphate; the raw materials in the step (2) are as follows in parts by weight: 50-100 parts of silicon rubber; 5-20 parts of a flame retardant; 1-20 parts of tackifier; 20-50 parts of reinforcing agent; 0.1-5 parts of structure control agent.
Further, in the step (3), the silane coupling agent is one or more of vinyltrimethoxysilane, vinyltriethoxysilane and KH-560. The irradiation source in the step (4) is60One of Co-gamma ray and electron beam; the irradiation dose is 20-150 kGy; the irradiation time is 0-60 min.
Compared with the prior art, the invention has the beneficial effects that:
(1) the ceramic silicone rubber composite tape with the mica layer in the middle prepared by the invention has more excellent flame retardant effect, namely the synergistic effect of the ceramic silicone rubber and the mica tape is fully exerted, the strength and the heat insulation performance of the composite tape are improved, and the shockproof and water-resistant effects are more ideal; the bottommost layer of the composite tape is self-adhesive silicon rubber, so that the composite tape has excellent adhesive property and can be better coated to ensure that the composite tape is not easy to separate from a coated layer; the composite tape can be widely applied to insulating materials and fireproof flame-retardant materials of wires and cables, and the use safety of the cables is obviously improved;
(2) according to the invention, the three-layer structure is laminated through a cold pressing process, so that the internal stress is small, the deformation is small, the compression loss is small, the plasticity and interface fluidity between layers are poor during cold pressing and gluing, and preparation is provided for subsequent radiation crosslinking, so that elastic particles obtained after radiation crosslinking are more favorable for inducing the shearing yield and deformation around, and the optimization of a transition interface between layers is facilitated; partial high molecular line type is converted into a net structure through irradiation crosslinking, and the high temperature resistance and the strength at high temperature are obviously improved; new connecting bonds are formed among molecules, relative slippage of the molecules is prevented, rigidity is increased, creep behavior is reduced, and in addition, stress cracking resistance is improved.
The present invention will be further described with reference to the accompanying drawings to fully illustrate the objects, technical features and technical effects of the present invention.
Description of the drawings:
FIG. 1 is a schematic structural view of a prepared ceramicized silicone rubber composite tape with a mica layer in the middle;
FIG. 2 is a pictorial view of a ceramic silicone rubber composite tape with a mica layer in the middle prepared in example 1;
FIG. 3 is a macro topography plot of the composite tape prepared in example 1 at different ablation temperatures;
FIG. 4 is the rate of change of mass of the composite tape prepared in example 1 at different ablation temperatures;
FIG. 5 is the linear shrinkage of the composite tape prepared in example 1 at different ablation temperatures;
fig. 6 is a macro-topography of the cable wound by the ceramic silicone rubber composite tape with or without the mica tape prepared in example 1 and comparative example 1 after propane calcination for 2 min.
The specific implementation mode is as follows:
in order to make the advantages, technical solutions and objects of the present invention more apparent, the present invention is further described below with reference to examples. The following examples of the present invention are given to further illustrate the present invention, but not to limit the scope of the present invention.
Example 1
Mixing 100g of methyl vinyl silicone rubber on a double-roll open mill at room temperature, starting a double-roll gap to be 2-5mm, adjusting the roll gap after mixing for 5-20min, continuing mixing until the silicone rubber is wrapped by a roll, adding 50g of fumed silica and 1g of high vinyl silicone oil to uniformly mix, adding 20g of calcium carbonate and 10g of low-melting-point glass powder, continuing mixing for 5-20min, and then passing through a thin sheet to obtain a ceramic silicone rubber sheet with the thickness of 0.1-2 mm; mixing 50g of methyl vinyl silicone rubber raw rubber on a double-roll open mill in a room temperature environment until the silicone rubber is wrapped by a roll, adding 50g of fumed silica, 1g of high vinyl silicone oil, 10g of aluminum hydroxide and 5g of antimony trioxide to uniformly mix, adding 15g of rosin pentaerythritol ester to continue mixing, and finally feeding the mixture into a thin lower sheet to obtain a self-adhesive silicone rubber sheet with the thickness of 0.5-1 mm; carrying out surface treatment on a mica tape through vinyl trimethoxy silane to enable the surface of the mica tape to have unsaturated double bonds, and then pressing the mica tape together with ceramic silicone rubber and self-adhesive silicone rubber through a cold pressing process to obtain a sample with a three-layer structure, wherein the thickness of the mica tape is 0.2-1 mm; and (3) performing irradiation crosslinking by using an electron beam as an irradiation source through irradiation dosage of 20-50kGy to prepare the ceramic silicon rubber composite belt.
The performance test results of the ceramic silicone rubber composite tape with the mica layer in the middle prepared in example 1 are shown in the following table:
| test items | Measured value |
| Tensile Strength (MPa) | 10.1 |
| Elongation at Break (%) | 360 |
| Breakdown strength (KV/mm) | 30 |
| Volume resistivity (omega. m) | 4.8×1014 |
| Dielectric loss tangent | 0.018 |
| Dielectric constant | 3.1 |
| Electric carbon mark index (sloping plate method) | 3.6 |
The performance of the ceramicized silicone rubber composite tape with the mica layer in the middle prepared in example 1 was maintained in a muffle furnace at different temperatures for 30min to form a ceramicized layer, as shown in the following table:
example 2
Mixing 100g of methyl vinyl silicone rubber on a double-roll open mill at room temperature, starting a double-roll gap to be 2-4mm, adjusting the roll gap after mixing for 10-20min, continuing mixing until the silicone rubber is coated on a roll, adding 30g of fumed silica and 2g of high vinyl silicone oil to uniformly mix, adding 20g of wollastonite and 10g of low-melting-point glass powder, continuing mixing for 5-20min, and then feeding the mixture to a thin roll to obtain a silicone rubber sheet with the thickness of 0.1-2 mm; mixing 70g of methyl vinyl silicone rubber raw rubber on a double-roll open mill in a room temperature environment until the rubber is wrapped by a roll, adding 50g of fumed silica, 1g of high vinyl silicone oil and 15g of aluminum hydroxide to uniformly mix, adding 10g of rosin pentaerythritol ester to continue mixing, and finally feeding the mixture to a thin lower sheet to obtain a self-adhesive silicone rubber sheet with the thickness of 0.5-1 mm; carrying out surface treatment on a mica tape through vinyl trimethoxy silane to enable the surface of the mica tape to have unsaturated double bonds, and then pressing the mica tape together with ceramic silicone rubber and self-adhesive silicone rubber through a cold pressing process to obtain a sample with a three-layer structure, wherein the thickness of the mica tape is 0.2-1 mm; and (3) performing irradiation crosslinking by using an electron beam as an irradiation source through irradiation dosage of 20-30kGy to prepare the ceramic silicone rubber composite belt.
Example 3
Mixing 100g of methyl vinyl silicone rubber on a two-roll open mill at room temperature, starting a two-roll gap to be 2-5mm, adjusting the roll gap after mixing for 5-20min, continuing mixing until the silicone rubber is wrapped by a roll, adding 50g of precipitated silica white and 1g of hydroxy silicone oil to uniformly mix, adding 20g of mica and 10g of zinc borate to continue mixing for 5-20min, and then thinning to obtain a silicone rubber sheet with the thickness of 0.5-2 mm; mixing 100g of methyl phenyl vinyl silicone rubber raw rubber on a double-roll open mill in a room temperature environment until the silicone rubber is wrapped by a roll, adding 40g of fumed silica, 1g of high vinyl silicone oil and 15g of antimony trioxide to uniformly mix, adding 15g of tetradecyl borate to continue mixing, and finally passing through a thin lower sheet to obtain a self-adhesive silicone rubber sheet with the thickness of 0.5-1 mm; carrying out surface treatment on a mica tape through vinyl triethoxysilane to enable the surface of the mica tape to have unsaturated double bonds, and then pressing the mica tape together with ceramic silicone rubber and self-adhesive silicone rubber through a cold pressing process to obtain a sample with a three-layer structure, wherein the thickness of the mica tape is 0.2-1 mm; and (3) performing irradiation crosslinking by using an electron beam as an irradiation source through irradiation dosage of 20-50kGy to prepare the ceramic silicon rubber composite belt.
Example 4
Mixing 100g of methyl vinyl silicone rubber on a two-roll open mill at room temperature, starting a two-roll gap to be 2-5mm, adjusting the roll gap after mixing for 5-20min, continuing mixing until the silicone rubber is coated on a roll, adding 40g of precipitated silica white and 0.5g of hydroxy silicone oil to uniformly mix, adding 30g of mica and 15g of zinc borate, continuing mixing for 5-20min, and then thinning and discharging to obtain a silicone rubber sheet with the thickness of 1-2 mm; mixing 100g of raw methyl phenyl vinyl silicone rubber on a double-roll open mill in a room temperature environment until the raw methyl phenyl vinyl silicone rubber is coated on a roll, adding 50g of fumed silica, 1g of high vinyl silicone oil and 15g of antimony trioxide to uniformly mix, adding 20g of tripropyl borate to continue mixing, and finally feeding the sheet to obtain a self-adhesive silicone rubber sheet with the thickness of 0.7-1 mm; carrying out surface treatment on a mica tape through vinyl triethoxysilane to enable the surface of the mica tape to have unsaturated double bonds, and then pressing the mica tape together with ceramic silicone rubber and self-adhesive silicone rubber through a cold pressing process to obtain a sample with a three-layer structure, wherein the thickness of the mica tape is 0.2-1 mm; and (3) carrying out irradiation crosslinking by using an electron beam as an irradiation source through irradiation dosage of 40-80 kGy to prepare the ceramic silicone rubber composite belt.
Example 5
Mixing 80g of methyl vinyl silicone rubber on a double-roll open mill at room temperature, starting a double-roll gap to be 2-5mm, adjusting the roll gap after mixing for 5-20min, continuing mixing until the silicone rubber is wrapped by a roll, adding 40g of precipitated silica white and 1g of hydroxy silicone oil to uniformly mix, adding 20g of mica and 10g of low-melting-point glass powder, continuing mixing for 5-20min, and then thinning to obtain a silicone rubber sheet with the thickness of 1-2 mm; mixing 100g of raw methyl phenyl vinyl silicone rubber on a double-roll open mill in a room temperature environment until the raw methyl phenyl vinyl silicone rubber is coated on a roll, adding 40g of fumed silica, 1g of high vinyl silicone oil and 10g of antimony trioxide to uniformly mix, adding 10g of tripropyl borate to continue mixing, and finally feeding the sheet to obtain a self-adhesive silicone rubber sheet with the thickness of 0.7-1 mm; carrying out surface treatment on a mica tape through vinyl trimethoxy silane to enable the surface of the mica tape to have unsaturated double bonds, and then pressing the mica tape together with ceramic silicone rubber and self-adhesive silicone rubber through a cold pressing process to obtain a sample with a three-layer structure, wherein the thickness of the mica tape is 0.2-1 mm; and (3) carrying out irradiation crosslinking by using an electron beam as an irradiation source through irradiation dosage of 40-100 kGy to prepare the ceramic silicone rubber composite belt.
Example 6
Mixing 90g of methyl vinyl silicone rubber on a two-roll open mill at room temperature, starting the two-roll gap to be 2-5mm, adjusting the roll gap after mixing for 5-20min, continuing mixing until the silicone rubber is wrapped by a roll, adding 50g of precipitated silica white and 1g of hydroxy silicone oil to uniformly mix, adding 20g of montmorillonite and 10g of zinc borate to continue mixing for 5-20min, and then passing through a thin lower sheet to obtain a silicone rubber sheet with the thickness of 0.1-0.5 mm; mixing 50g of methyl vinyl silicone rubber raw rubber on a double-roll open mill in a room temperature environment until the silicone rubber is wrapped by a roll, adding 50g of fumed silica, 1g of high vinyl silicone oil, 10g of aluminum hydroxide and 5g of antimony trioxide to uniformly mix, adding 15g of rosin pentaerythritol ester to continue mixing, and finally feeding the mixture into a thin lower sheet to obtain a self-adhesive silicone rubber sheet with the thickness of 0.5-1 mm; carrying out surface treatment on a mica tape through vinyl trimethoxy silane to enable the surface of the mica tape to have unsaturated double bonds, and then pressing the mica tape together with ceramic silicone rubber and self-adhesive silicone rubber through a cold pressing process to obtain a sample with a three-layer structure, wherein the thickness of the mica tape is 0.2-1 mm; and (3) performing irradiation crosslinking by using an electron beam as an irradiation source through irradiation dosage of 20-50kGy to prepare the ceramic silicon rubber composite belt.
Example 7
Mixing 100g of methyl vinyl silicone rubber on a two-roll open mill at room temperature, starting a two-roll gap to be 2-5mm, adjusting the roll gap after mixing for 5-20min, continuing mixing until the silicone rubber is coated on a roll, adding 40g of precipitated silica white and 1g of hydroxy silicone oil to uniformly mix, adding 20g of montmorillonite and 10g of zinc borate to continue mixing for 10-20min, and then passing through a thin lower sheet to obtain a silicone rubber sheet with the thickness of 0.5-1.5 mm; mixing 50g of methyl vinyl silicone rubber raw rubber on a double-roll open mill in a room temperature environment until the silicone rubber is wrapped by a roll, adding 30g of fumed silica, 1g of high vinyl silicone oil, 10g of aluminum hydroxide and 5g of antimony trioxide to uniformly mix, adding 10g of rosin pentaerythritol ester to continue mixing, and finally feeding the mixture into a thin lower sheet to obtain a self-adhesive silicone rubber sheet with the thickness of 0.5-1 mm; carrying out surface treatment on a mica tape through vinyl triethoxysilane to enable the surface of the mica tape to have unsaturated double bonds, and then pressing the mica tape together with ceramic silicone rubber and self-adhesive silicone rubber through a cold pressing process to obtain a sample with a three-layer structure, wherein the thickness of the mica tape is 0.2-1 mm; and (3) performing irradiation crosslinking by using an electron beam as an irradiation source through irradiation dosage of 30-50kGy to prepare the ceramic silicon rubber composite belt.
Comparative example 1
Mixing 100g of methyl vinyl silicone rubber on a double-roll open mill at room temperature, starting a double-roll gap to be 2-5mm, adjusting the roll gap after mixing for 5-20min, continuing mixing until the silicone rubber is wrapped by a roll, adding 50g of fumed silica and 1g of high vinyl silicone oil to be uniformly mixed, adding 20g of calcium carbonate and 10g of low-melting-point glass powder, continuing mixing for 5-20min, and then passing through a thin sheet to obtain a silicone rubber sheet with the thickness of 0.1-2 mm; mixing 50g of methyl vinyl silicone rubber raw rubber on a double-roll open mill in a room temperature environment until the silicone rubber is wrapped by a roll, adding 50g of fumed silica, 1g of high vinyl silicone oil, 10g of aluminum hydroxide and 5g of antimony trioxide to uniformly mix, adding 15g of rosin pentaerythritol ester to continue mixing, and finally feeding the mixture into a thin lower sheet to obtain a self-adhesive silicone rubber sheet with the thickness of 0.5-1 mm; then pressing the ceramic silicon rubber and the self-adhesive silicon rubber together through a cold pressing process to obtain a sample with a two-layer structure; and (3) performing irradiation crosslinking by using an electron beam as an irradiation source through irradiation dosage of 20-50kGy to prepare the irradiation crosslinked ceramic silicon rubber composite belt.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The ceramic silicone rubber composite tape with the mica layer is characterized in that the composite tape is of a three-layer structure and sequentially comprises ceramic silicone rubber, the mica tape and self-adhesive silicone rubber from top to bottom; the structural layers are combined through cold pressing and radiation crosslinking.
2. The preparation method of the ceramic silicone rubber composite belt according to claim 1, comprising the following specific steps:
(1) preparation of the ceramic silicone rubber sheet: mixing raw silicon rubber in a room temperature environment until the raw silicon rubber is coated with a roller, adding a reinforcing agent and a structure control agent to be uniformly mixed, adding a porcelain forming filler and a melting aid to continue mixing, and finally passing through a thin lower sheet to obtain a ceramic silicon rubber sheet;
(2) preparation of self-adhesive silicone rubber sheet: mixing raw silicon rubber at room temperature until the silicon rubber is wrapped by a roller, adding a reinforcing agent, a structure control agent and a flame retardant to be uniformly mixed, adding a tackifier to continue mixing, and finally passing through a thin lower sheet to obtain a viscous silicon rubber sheet;
(3) and (3) laminating the mica tape and the silicone rubber sheet: carrying out surface treatment on the mica tape by using a silane coupling agent to enable the surface of the mica tape to have unsaturated double bonds, and then pressing the mica tape together with ceramic silicon rubber and self-adhesive silicon rubber by using a cold pressing process to obtain a sample with a three-layer structure;
(4) preparing a composite tape by irradiation: and (4) carrying out irradiation crosslinking on the sample obtained in the step (3) to obtain the ceramic silicon rubber composite belt with the mica layer.
3. The production method according to claim 2, wherein the silicone rubber in the step (1) is one or more of dimethyl silicone rubber, methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber and fluoro silicone rubber; the porcelain forming filler is one or more of mica, montmorillonite, wollastonite, aluminum hydroxide, calcium carbonate and kaolin; the melting auxiliary agent is one or more of low-melting-point glass powder, zinc borate and boron oxide; the reinforcing agent is one or more of fumed silica and precipitated silica; the structure control agent is one or more of hydroxyl silicone oil and high vinyl silicone oil; the raw materials in the step (1) are as follows in parts by weight: 70-100 parts of silicon rubber; 10-40 parts of porcelain forming filler; 1-20 parts of a melting auxiliary agent; 20-50 parts of reinforcing agent; 0.1-5 parts of structure control agent.
4. The preparation method according to claim 2, wherein the silicone rubber in the step (2) is one or more of dimethyl silicone rubber, methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber; the tackifier is one or more of rosin pentaerythritol ester, tripropyl borate, rosin glycerol ester and tetradecyl borate; the reinforcing agent is one or more of fumed silica and precipitated silica; the structure control agent is one or more of hydroxyl silicone oil and high vinyl silicone oil; the flame retardant is one or more of aluminum hydroxide, zinc borate, antimony trioxide and ammonium polyphosphate; the raw materials in the step (2) are as follows in parts by weight: 50-100 parts of silicon rubber; 5-20 parts of a flame retardant; 1-20 parts of tackifier; 20-50 parts of reinforcing agent; 0.1-5 parts of structure control agent.
5. The production method according to claim 2, wherein the thickness of the cerammed silicone rubber sheet in the step (1) is 0.1 to 2 mm; the thickness of the self-adhesive silicon rubber sheet in the step (2) is 0.5-1 mm; the thickness of the mica tape in the step (2) is 0.2-1 mm.
6. The method according to claim 2, wherein the silane coupling agent in step (3) is one or more selected from vinyltrimethoxysilane, vinyltriethoxysilane and KH-560.
7. The production method according to claim 2, wherein the irradiation source in the step (4) is one of 60 Co-gamma rays and electron beams; the irradiation dose is 20-150 kGy; the irradiation time is 0-60 min.
8. The ceramicized silicone rubber composite tape with mica layer obtained by the preparation method according to any one of claims 2 to 7, wherein the composite tape has applications as an insulating material, a shielding material and a fire-proof material for wires and cables.
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