CN101781463B - Fire-resistant silicon rubber and preparation method thereof and cable - Google Patents
Fire-resistant silicon rubber and preparation method thereof and cable Download PDFInfo
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- CN101781463B CN101781463B CN2009103002582A CN200910300258A CN101781463B CN 101781463 B CN101781463 B CN 101781463B CN 2009103002582 A CN2009103002582 A CN 2009103002582A CN 200910300258 A CN200910300258 A CN 200910300258A CN 101781463 B CN101781463 B CN 101781463B
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Abstract
The invention discloses a fire-resistant silicon rubber, which is prepared by the following raw materials by weight: 100 parts of silicon rubber, 0.1 to 3 parts of hydrogen-containing silicone oil, 2 to 15 parts of hydroxy silicone oil, 10 to 30 parts of pyrogenic silica, 10 to 30 parts of silicon epitaxy material, 20 to 50 parts of nanomontmorillonite, 10 to 30 parts of silicon carbide, 1 part of vulcanizing agent and less than 50 ppm of platinum compound calculating at the platinum quantity compared with the silicon rubber. The invention also provides a preparation method of the silicon rubber and a fire-resistant cable prepared with the silicon rubber. The fire-resistant silicon rubber has the performances such as stable fire resistance and good insulation performance, and has simple preparation method. The cable which is prepared with the fire-resistant silicon rubber has simple structure and convenient process. Particularly the reliability of the fire-resistant cable can be greatly improved.
Description
Technical field
The invention belongs to fire resisting material field, be specifically related to the cable of a kind of fire-resistant silicon rubber and preparation thereof.
Background technology
Electric wire is distributed widely in each corners such as power plant, underground installation, building, in case presence of fire and rapid spread bring massive losses will for people's life and property.Flame resistant cable is a kind of when burning takes place, and still can guarantee the cable of circuit normal operation in certain hour, when presence of fire, can continue transmission of electric energy and signal.
Copper core copper sheath magnesium oxide insulating cable; Be MI cable abroad; Domestic abbreviation mineral insulated cable or fireproof cable, it is to adopt the copper of high conductivity to make conductor, inorganics Natural manganese dioxide insulate; Seamless copper pipe is made sheath, uses cable through modern architecture wiring cable and special industry (like metallurgy, chemical industry, oil etc.) that special process is made.Though mineral insulated cable has high use temperature, the back that catches fire keeps long power supply capacity also fine, this cable have a following shortcoming: 1) factory length is restricted, the complete processing more complicated; 2) cable splice difficulty; 3) cost involves great expense; 4) the cable bending property is poor, and construction requirement is high, therefore in practical application, receives a lot of restrictions.
For improving the shortcoming of mineral insulated cable, on market, using at present the most extensively is the wrapped fireinsulation cable of mica, but this type flame resistant cable is after meeting fire burns; Organic materials is burnt mistake; Cause the cable internal structure loosening, cause the fragmentation of mica insulation layer to come off, thereby the forfeiture insulating property; Can't remain on the function of supplying power in the flame, so its application receives certain limitation equally.
In actual production and using, people constantly improve the material and the structure of flame resistant cable, as:
The disclosed fireproof power cable of one Chinese patent application CN03206644.9, its structure are that conductor is followed successively by wrapped fire-resistant isinglass belt, polyester belt, insulation layer outward, coats non-woven fabrics, steel-tape armouring layer, oversheath selectively.Polyester belt, insulation layer, non-woven fabrics are organism, in the environment of flame, all can be burnt and lose, and cause the loosening of cable internal structure.
The disclosed a kind of Zylox flame resistant cable of one Chinese patent application CN02287645.6 adopts conventional silastic material as flame retardant coating and insulation layer.Though become SiO after the burning
2Have fire performance, but the SiO after the burning
2Be powdery, do not have sticking power, come off easily, therefore fire-resistant effect still has big distance.
The disclosed potteryization silicon rubber insulation fire-resistant of one Chinese patent application CN200720131864.2 cable is a cable core with the conductor that is coated with refractory insulating layer, and high temperature resistant packing layer is set between each cable core, and resist, and the appearance of cable is an external sheath layer; It is characterized in that refractory insulating layer is is material with the pottery fire-resistant silicon rubber.This utility model possesses excellent fire performance, and when having fire to take place, cable line still can keep the normal operation of certain hour.But this potteryization fire-resistant silicon rubber costs an arm and a leg, and the pottery Zylox after burning is more crisp, is easy to generate crackle, forms conductive channel, causes the instability of fire performance.
Zylox, SILICONE, main chain alternately is made up of silicone atom, on Siliciumatom, has organic group.Zylox has excellent performances such as thermotolerance, winter hardiness, dielectricity, anti-ozone and anti-atmospheric aging, and the outstanding performance of Zylox is to use temperature broad, can be at-60 ℃ (or lower temperature) to+250 ℃ (or higher temperature) life-time service down.But mechanical propertys such as the tensile strength of Zylox and tearing toughness are relatively poor, and its physical and mechanical properties is not as good as most of viton at normal temperatures, and except that nitrile silicon, trifluoropropyl siloxane, general Zylox oil resistant, solvent resistance are not good enough.Because flame retardant resistance, arc ablation resistance performance to the silastic material that is applied to the high-voltage field have very high requirement, therefore need in conventional silicone rubber formulations, to add auxiliary agents such as strengthening agent, constitution controller, vulcanizing agent Zylox is carried out modification.
Summary of the invention
For overcoming the shortcoming that prior art exists, the object of the invention at first provides a kind of fire-resistant silicon rubber, and this kind fire-resistant silicon rubber material has characteristics such as fire performance is stable, good insulation preformance.
Second purpose of the present invention provides the preparation method of above-mentioned fire-resistant silicon rubber.
The 3rd purpose of the present invention provides a kind of fire-resistant silicon rubber cable, and its insulation layer of described flame resistant cable is prepared by fire-resistant silicon rubber provided by the invention.
For realizing first purpose of the present invention, the contriver provides following technical scheme:
A kind of fire-resistant silicon rubber; It is to be base material with Zylox; Add containing hydrogen silicone oil, hydroxy silicon oil, gas-phase silica, silicon powder, nano imvite, silit, platinic compound such as Platinic chloride etc. different substances is mixing forming, wherein said fire-resistant silicon rubber main raw materials in proportion is following by weight: Zylox 100, containing hydrogen silicone oil 0.1-3, hydroxy silicon oil 2-15, gas-phase silica 10-30, silicon powder 10-30, nano imvite 20-50, silit 10-30, vulcanizing agent 1, compare the platinic compound＜50ppm by the platinum amount with Zylox.
Silicon raw rubber is non-crystalline polymer; The intensity of its cross-linked rubber is lower, add WHITE CARBON BLACK after, interaction improves the intensity of Zylox between three kinds of groups that can be through the WHITE CARBON BLACK surface and the hydrogen bond of polysilane; Gas-phase silica is a kind of strengthening agent filler; It can make the inflaming retarding high-temperature sulphurated siliastic have mechanical property preferably, can make the inflaming retarding high-temperature sulphurated siliastic have flame retardancy preferably again, is again a kind of mineral filler preferably; Along with the increase of graphitized carbon black consumption, the electroconductibility of Zylox can improve, and hardness is also along with increase; But its intensity can descend to some extent; Therefore, the needs adding is a kind of can to reduce little to the intensity effect again tenderizer of hardness, and containing hydrogen silicone oil and hydroxy silicon oil can play ramollescence as constitution controller. and the over-all properties of Zylox is increased; Can avoid glue stuff compounding storage period long, produce " structurizing " the sizing material hardening become fragile, be difficult to process slaking; Silicon powder is one type of purposes ceramic very widely; Have the dielectric properties excellence, thermal expansivity is low, thermal conductivity is high; Can be used as silicone gasket, because its Ultrastructural infilling, the compactness of Zylox and intensity can obtain to increase substantially; The nano imvite average wafer thickness is less than 25nm; Smectite content has good dispersing property, as additive greater than 95%; The tensile strength of Zylox is the trend of falling after rising with the increase of its consumption; Can improve Zylox shock resistance, antifatigue, dimensional stability and gas barrier property etc., thereby play the effect that strengthens the comprehensive physicals of polymkeric substance, improve the material processing characteristics simultaneously; The high-temperature silicon disulfide rubber that contains fire retardant tends to produce smog and toxic gas in combustion processes, this is the major cause that causes the personnel death in the fire; Silit is a kind of reasonable mineral filler that can suppress to be fuming and catch toxic gas, and its hardness is very big, has good heat conductivility; Can be anti-oxidant during high temperature; Thermal expansion is again little, and heat-shock resistance is very high, is the fine refractory materials; Platinic compound is a catalyzer, when adding vulcanizing agent, adds, can the accelerated cure speed of response.
Preferred scheme is that according to fire-resistant silicon rubber of the present invention, wherein, described Zylox is selected methyl vinyl silicone rubber for use; Platinic compound is selected Platinic chloride for use.
Preferred scheme is, according to fire-resistant silicon rubber of the present invention, wherein; Described vulcanizing agent is selected from the organo-peroxide at least a; Said organo-peroxide comprises Lucidol, 2,4 dichloro benzene formyl, dicumyl peroxide, 2,5-di-tert-butyl peroxo-hexane.Preferred 2,4 dichloro benzene formyl is as vulcanizing agent in the preferred embodiment of the present invention.
For realizing second purpose of the present invention, the contriver provides following technical scheme:
A kind of preparation method of fire-resistant silicon rubber mainly comprises the steps:
(1) Zylox mixes glue and handles back interpolation containing hydrogen silicone oil and hydroxy silicon oil, and is mixing even;
(2) in the rubber unvulcanizate that step (1) obtains, add gas-phase silica and silicon powder, mixing even;
(3) in the rubber unvulcanizate that step (2) obtains, add nano imvite and silit, mixing even;
(4) the rubber unvulcanizate thermal treatment that step (3) is obtained, cooling then;
(5) vulcanizing agent, platinic compound are added in the sizing material secondary back mixing that step (4) is obtained then, obtain the fire-resistant silicon rubber material.
Preferred scheme is that according to preparation method of the present invention, wherein, described preparation method also comprises step (6): the sizing material that step (5) obtains is done sulfidizing again after processing is extruded in insulation, obtain fire-resistant silicon rubber insulation materials.
Preferred scheme is that according to preparation method of the present invention, wherein, the mixed glue processing of Zylox required time is 5-8 minute in the described step (1); In the step (2) mixing even required time 30-50 minute; Thermal treatment is 130-190 ℃ of insulation 1-4 hour in the step (4).
Preferred scheme is that according to preparation method of the present invention, wherein, described Zylox is selected methyl vinyl silicone rubber for use; Platinic compound is selected Platinic chloride for use; Vulcanizing agent is selected from the superoxide at least a, and said organo-peroxide comprises Lucidol, 2,4 dichloro benzene formyl, dicumyl peroxide, 2,5-di-tert-butyl peroxo-hexane.Preferred 2,4 dichloro benzene formyl is as vulcanizing agent in the preferred embodiment of the present invention.
Preferred scheme is that according to preparation method of the present invention, wherein, sulfidizing is for to vulcanize in 160-200 ℃ of sulfuration drying tunnel in the described step (6).
For realizing the 3rd purpose of the present invention, the contriver provides following technical scheme:
A kind of cable of fire-resistant silicon rubber preparation; Described cable comprises conductor thread core; Conductor thread core is surrounded by the fire-resistant silicon rubber insulation layer outward; The fire-resistant silicon rubber insulation layer is surrounded by the low smoke and zero halogen restrictive coating outward, wherein, and the fire-resistant silicon rubber material that described fire-resistant silicon rubber insulation layered material adopts above-mentioned two technical schemes to provide.The construction of cable such as Fig. 1, shown in Figure 2.
Preferred scheme is according to cable of the present invention, wherein, to be provided with copper foil layer between said fire-resistant silicon rubber layer and the low smoke and zero halogen restrictive coating.Adopt the above copper strips screen layer of 0.4 thickness, when burning takes place, can play protection fire-resistant silicon rubber insulation layer and come off, waterproof is drenched, reflective reduction silicone rubber insulation layer action of temperature in the flame.
The restrictive coating that preferred scheme is a cable of the present invention adopts low-smoke non-halogen flame-retardant protection against rodents sheath material.
The general employing of fire-resistant silicon rubber in the preferred embodiment of the present invention is prepared as follows method, mainly comprises following step:
(1) Zylox was mixed glue 5-8 minute in two roller mills, add containing hydrogen silicone oil and hydroxy silicon oil, mixing even;
(2) in the rubber unvulcanizate that step (1) obtains, add gas-phase silica and silicon powder, mixing 30-50 minute, make height and tear high-intensity silicon rubber gross rubber;
(3) in the rubber unvulcanizate that step (2) obtains, add nano imvite and silit, mixing even, the time is approximately 10-20 minute;
(4) rubber unvulcanizate that step (3) is obtained was cooled to room temperature then at 130-190 ℃ of following thermal treatment 1-4 hour;
(5) after the sizing material secondary back mixing that step (4) is obtained, add vulcanizing agent, platinic compound again, obtain the fire-resistant silicon rubber material;
(6) sizing material that step (5) is obtained is after extruding on the wire cable insulating forcing machine, and sizing material is done sulfidizing in 160-200 ℃ of sulfuration drying tunnel, obtains fire-resistant silicon rubber insulation materials.
Through test, the key technical indexes of the present invention is:
Hardness (Shao Shi A)＞63
Tensile strength (MPa)＞9
Volume specific resistance (Ω mcm)＞1 * 10
15
Fire performance is through the test of IEC 60331-21 and GB/T19216.
Compared with prior art, the present invention has following advantage:
It is stable that fire-resistant silicon rubber of the present invention has fire performance, and insulating property are high, the advantage of good mechanical property, and its preparation method has that technology is simple, the advantage of non-environmental-pollution, three-waste free discharge.
In fire testing, find; In being higher than 950 ℃ of flame environments, cable fire of the present invention is after for some time, and fire-resistant silicon rubber layer and conductor thread core sinter piece into; The fire-resistant silicon rubber layer can firmly be attached to conductive surface and form the high-temperature insulation flame retardant coating with intensity; Difficult drop-off, thus can guarantee that cable keeps energising in flame environment, can improve the safety of flame resistant cable greatly.
The construction of cable of the present invention is simple, easy to make.Electric wire of the present invention can be widely used in occasions such as subway, market, hotel, conference centre, theater, boats and ships, can reduce the life and the property damage that cause because of fire, for society brings huge economic and social benefit.
Brief Description Of Drawings
Fig. 1 is a tool list core conductor construction of cable synoptic diagram of the present invention;
Fig. 2 is a tool multi-core conductor construction of cable synoptic diagram of the present invention,
Among the figure: the 1st, conductor thread core; The 2nd, the fire-resistant silicon rubber insulation layer; The 3rd, the low smoke and zero halogen restrictive coating; The 4th, copper foil layer.
Embodiment
Reach embodiment with reference to the accompanying drawings, content of the present invention more specifically is described.Should be appreciated that enforcement of the present invention is not limited to following embodiment, all will fall into protection domain of the present invention any pro forma accommodation and/or the change that the present invention made.
In the present invention, if not refer in particular to, all part, per-cents are weight unit, and all equipment and raw material etc. all can be buied from market or the industry is commonly used.
Prepare the fire-resistant silicon rubber raw material according to the prescription in the table 11.
The fire-resistant silicon rubber preparation method is following:
(1) methyl vinyl silicone rubber 500kg is mixed glue 5 minutes on Banbury mixer, add containing hydrogen silicone oil 5kg and hydroxy silicon oil 20kg again, mixing even;
(2) (1) obtain rubber unvulcanizate in add gas-phase silica 100kg and silicon powder 100kg, mixing 30 minutes, make height and tear high-intensity silicon rubber gross rubber;
(3) in the rubber unvulcanizate that (2) obtain, add nano imvite 150kg and silit 100kg, mixing 20 minutes;
(4) rubber unvulcanizate that (3) is obtained is 180 ℃ of following thermal treatments 1 hour, cooling then;
(5) 5kg vulcanizing agent 2,4 dichloro benzene formyl and 0.05kg Platinic chloride are added in the sizing material secondary back mixing that (4) is obtained, and obtain the fire-resistant silicon rubber material.
The fire-resistant silicon rubber material that (5) are obtained is after extruding on the wire cable insulating forcing machine; Sizing material vulcanizes in 160 ℃ of sulfuration drying tunnels; Obtain the required fire-resistant silicon rubber insulation of cable preparation materials, and can prepare the fire-resistant silicon rubber cable of structure as shown in Figure 2 according to ordinary method.
With the fire-resistant silicon rubber insulation materials that obtain, tensile property press that GB/T528-92 measures, hardness press GB/T531-92 mensuration, volume specific resistance is pressed GB 2439-89 mensuration, and detected result is seen table 2.
Fire-resistant silicon rubber cable with preparation; Fire-resistant test is carried out in requirement according to GB/T 19216.21-2003 " the circuit integrity of cable or optical cable is tested the 21st part under flame condition: testing sequence and requirement-voltage rating 0.6/1.0kV and following cable ", and detected result is seen table 2.
Embodiment 2
Prepare the fire-resistant silicon rubber raw material according to the prescription in the table 12.
The fire-resistant silicon rubber preparation method is following:
(1) methyl vinyl silicone rubber 400kg is mixed glue 5 minutes on Banbury mixer, add containing hydrogen silicone oil 4kg and hydroxy silicon oil 16kg again, mixing even;
(2) in the rubber unvulcanizate that (1) obtains, add gas-phase silica 80kg and silicon powder 120kg, mixing 30 minutes, make height and tear high-intensity silicon rubber gross rubber;
(3) in the rubber unvulcanizate that (2) obtain, add nano imvite 200kg and silit 100kg, mixing 15 minutes;
(4) rubber unvulcanizate that (3) is obtained is 180 ℃ of following thermal treatments 1 hour, cooling then;
(5) 4kg vulcanizing agent 2,4 dichloro benzene formyl and 0.05kg Platinic chloride are added in the sizing material secondary back mixing that (4) is obtained, and obtain the fire-resistant silicon rubber material.
The fire-resistant silicon rubber material that (5) are obtained is after extruding on the wire cable insulating forcing machine; Sizing material vulcanizes in 180 ℃ of sulfuration drying tunnels; Obtain the required fire-resistant silicon rubber insulation of cable preparation materials, and can prepare the fire-resistant silicon rubber cable of structure as shown in Figure 2 according to ordinary method.
With the fire-resistant silicon rubber insulation materials that obtain, tensile property press that GB/T528-92 measures, hardness press GB/T531-92 mensuration, volume specific resistance is pressed GB 2439-89 mensuration, and detected result is seen table 2.
Fire-resistant silicon rubber cable with preparation; Fire-resistant test is carried out in requirement according to GB/T 19216.21-2003 " the circuit integrity of cable or optical cable is tested the 21st part under flame condition: testing sequence and requirement-voltage rating 0.6/1.0kV and following cable ", and detected result is seen table 2.
Prepare the fire-resistant silicon rubber raw material according to the prescription in the table 13.
The fire-resistant silicon rubber preparation method is following:
(1) methyl vinyl silicone rubber 500kg is mixed glue 6 minutes on Banbury mixer, add containing hydrogen silicone oil 8kg and hydroxy silicon oil 10kg again, mixing even;
(2) in the rubber unvulcanizate that (1) obtains, add gas-phase silica 150kg and silicon powder 50kg, mixing 40 minutes, make height and tear high-intensity silicon rubber gross rubber;
(3) in the rubber unvulcanizate that (2) obtain, add nano imvite 100kg and silit 150kg, mixing 12 minutes;
(4) rubber unvulcanizate that (3) is obtained is 130 ℃ of following thermal treatments 4 hours, cooling then;
(5) 5kg vulcanizing agent 2,4 dichloro benzene formyl and 0.05kg Platinic chloride are added in the sizing material secondary back mixing that (4) is obtained, and obtain the fire-resistant silicon rubber material.
The fire-resistant silicon rubber material that (5) are obtained is after extruding on the wire cable insulating forcing machine; Sizing material vulcanizes in 170 ℃ of sulfuration drying tunnels; Obtain the required fire-resistant silicon rubber insulation of cable preparation materials, and can prepare the fire-resistant silicon rubber cable of structure as shown in Figure 2 according to ordinary method.
With the fire-resistant silicon rubber insulation materials that obtain, tensile property press that GB/T528-92 measures, hardness press GB/T531-92 mensuration, volume specific resistance is pressed GB 2439-89 mensuration, and detected result is seen table 2.
Fire-resistant silicon rubber cable with preparation; Fire-resistant test is carried out in requirement according to GB/T 19216.21-2003 " the circuit integrity of cable or optical cable is tested the 21st part under flame condition: testing sequence and requirement-voltage rating 0.6/1.0kV and following cable ", and detected result is seen table 2.
Embodiment 4
Prepare the fire-resistant silicon rubber raw material according to the prescription in the table 14.
The fire-resistant silicon rubber preparation method is following:
(1) methyl vinyl silicone rubber 500kg is mixed glue 8 minutes on Banbury mixer, add containing hydrogen silicone oil 15kg and hydroxy silicon oil 20kg again, mixing even;
(2) in the rubber unvulcanizate that (1) obtains, add gas-phase silica 50kg and silicon powder 150kg, mixing 50 minutes, make height and tear high-intensity silicon rubber gross rubber;
(3) in the rubber unvulcanizate that (2) obtain, add nano imvite 200kg and silit 100kg, mixing 18 minutes;
(4) with the rubber unvulcanizate that obtains of (3) 180 ℃ of following thermal treatments 1 hour, cooling then;
(5) 5kg vulcanizing agent 2,4 dichloro benzene formyl and 0.03kg Platinic chloride are added in the sizing material secondary back mixing that (4) is obtained, and obtain the fire-resistant silicon rubber material.
The fire-resistant silicon rubber material that (5) are obtained is after extruding on the wire cable insulating forcing machine; Sizing material vulcanizes in 190 ℃ of sulfuration drying tunnels; Obtain the required fire-resistant silicon rubber insulation of cable preparation materials, and can prepare the fire-resistant silicon rubber cable of structure as shown in Figure 2 according to ordinary method.
With the fire-resistant silicon rubber insulation materials that obtain, tensile property press that GB/T528-92 measures, hardness press GB/T531-92 mensuration, volume specific resistance is pressed GB 2439-89 mensuration, and detected result is seen table 2.
Fire-resistant silicon rubber cable with preparation; Fire-resistant test is carried out in requirement according to GB/T 19216.21-2003 " the circuit integrity of cable or optical cable is tested the 21st part under flame condition: testing sequence and requirement-voltage rating 0.6/1.0kV and following cable ", and detected result is seen table 2.
Embodiment 5
Prepare the fire-resistant silicon rubber raw material according to the prescription in the table 15.
The fire-resistant silicon rubber preparation method is following:
(1) methyl vinyl silicone rubber 500kg is mixed glue 7 minutes on Banbury mixer, add containing hydrogen silicone oil 0.5kg and hydroxy silicon oil 30kg again, mixing even;
(2) in the rubber unvulcanizate that (1) obtains, add gas-phase silica 80kg and silicon powder 100kg, mixing 35 minutes, make height and tear high-intensity silicon rubber gross rubber;
(3) in the rubber unvulcanizate that (2) obtain, add nano imvite 250kg and silit 50kg, mixing 17 minutes;
(4) rubber unvulcanizate that (3) is obtained is 170 ℃ of following thermal treatments 3 hours, cooling then;
(5) 5kg vulcanizing agent 2,4 dichloro benzene formyl and 0.03kg Platinic chloride are added in the sizing material secondary back mixing that (4) is obtained, and obtain the fire-resistant silicon rubber material.
The fire-resistant silicon rubber material that (5) are obtained is after extruding on the wire cable insulating forcing machine; Sizing material vulcanizes in 180 ℃ of sulfuration drying tunnels; Obtain the required fire-resistant silicon rubber insulation of cable preparation materials, and can prepare the fire-resistant silicon rubber cable of structure as shown in Figure 2 according to ordinary method.
With the fire-resistant silicon rubber insulation materials that obtain, tensile property press that GB/T528-92 measures, hardness press GB/T531-92 mensuration, volume specific resistance is pressed GB 2439-89 mensuration, and detected result is seen table 2.
Fire-resistant silicon rubber cable with preparation; Fire-resistant test is carried out in requirement according to GB/T 19216.21-2003 " the circuit integrity of cable or optical cable is tested the 21st part under flame condition: testing sequence and requirement-voltage rating 0.6/1.0kV and following cable ", and detected result is seen table 2.
Embodiment 6
Prepare the fire-resistant silicon rubber raw material according to the prescription in the table 16.
The fire-resistant silicon rubber preparation method is following:
(1) methyl vinyl silicone rubber 500kg is mixed glue 6 minutes on Banbury mixer, add containing hydrogen silicone oil 5kg and hydroxy silicon oil 75kg again, mixing even;
(2) in the rubber unvulcanizate that (1) obtains, add gas-phase silica 60kg and silicon powder 70kg, mixing 30 minutes, make height and tear high-intensity silicon rubber gross rubber;
(3) in the rubber unvulcanizate that (2) obtain, add nano imvite 120kg and silit 80kg, mixing 10 minutes;
(4) rubber unvulcanizate that (3) is obtained is 190 ℃ of following thermal treatments 1 hour, cooling then;
(5) 5kg vulcanizing agent 2,4 dichloro benzene formyl and 0.05kg Platinic chloride are added in the sizing material secondary back mixing that (4) is obtained, and obtain the fire-resistant silicon rubber material.
The fire-resistant silicon rubber material that (5) are obtained is after extruding on the wire cable insulating forcing machine; Sizing material vulcanizes in 200 ℃ of sulfuration drying tunnels; Obtain the required fire-resistant silicon rubber insulation of cable preparation materials, and can prepare the fire-resistant silicon rubber cable of structure as shown in Figure 2 according to ordinary method.
With the fire-resistant silicon rubber insulation materials that obtain, tensile property press that GB/T528-92 measures, hardness press GB/T531-92 mensuration, volume specific resistance is pressed GB 2439-89 mensuration, and detected result is seen table 2.
Fire-resistant silicon rubber cable with preparation; Fire-resistant test is carried out in requirement according to GB/T 19216.21-2003 " the circuit integrity of cable or optical cable is tested the 21st part under flame condition: testing sequence and requirement-voltage rating 0.6/1.0kV and following cable ", and detected result is seen table 2.
Comparative example
According to the prescription of the comparative example in the table 1 prepared silicon rubber raw materials.
The Zylox preparation method is following:
(1) methyl vinyl silicone rubber 500kg is mixed glue 5 minutes on Banbury mixer, add containing hydrogen silicone oil 5kg and hydroxy silicon oil 20kg again, mixing even;
(2) in the rubber unvulcanizate that step (1) obtains, add gas-phase silica 100kg, mixing 30 minutes;
(3) rubber unvulcanizate that step (2) is obtained is 180 ℃ of following thermal treatments 1 hour, cooling then;
(4) 5kg vulcanizing agent 2,4 dichloro benzene formyl and 0.05kg Platinic chloride are added in the sizing material secondary back mixing that step (3) is obtained, and obtain the Zylox material.
The Zylox material that (4) are obtained is after extruding on the wire cable insulating forcing machine, and sizing material vulcanizes in 170 ℃ of sulfuration drying tunnels, obtains the required silicon rubber insulation materials of cable preparation, and can prepare the silicone rubber for cable of structure as shown in Figure 2 according to ordinary method.
With the silicon rubber insulation materials that obtain, tensile property press that GB/T528-92 measures, hardness press GB/T531-92 mensuration, volume specific resistance is pressed GB 2439-89 mensuration, and detected result is seen table 2.
Silicone rubber for cable with preparation; Fire-resistant test is carried out in requirement according to GB/T 19216.21-2003 " the circuit integrity of cable or optical cable is tested the 21st part under flame condition: testing sequence and requirement-voltage rating 0.6/1.0kV and following cable ", and detected result is seen table 2.
Table 1 embodiment and comparative example composition of raw materials
Table 2 embodiment and comparative example detected result
Claims (5)
1. fire-resistant silicon rubber; It is characterized in that; Described fire-resistant silicon rubber is mainly by the mixing acquisition of following weight parts raw material: Zylox 100, containing hydrogen silicone oil 0.1-3, hydroxy silicon oil 2-15, gas-phase silica 10-30, silicon powder 10-30, nano imvite 20-50, silit 10-30, vulcanizing agent 1, compare platinic compound＜50 ppm by the platinum amount with Zylox
The preparation method of said fire-resistant silicon rubber comprises the steps:
(1) Zylox mixes glue processing back interpolation containing hydrogen silicone oil and hydroxy silicon oil, and is mixing even, and it is 5-8 minute that Zylox mixes glue processing required time;
(2) in the rubber unvulcanizate that step (1) obtains, add gas-phase silica and silicon powder, mixing even, mixing even required time 30-50 minute;
(3) in the rubber unvulcanizate that step (2) obtains, add nano imvite and silit, mixing even;
(4) the rubber unvulcanizate thermal treatment that step (3) is obtained, cooling then, thermal treatment are 130-190 ℃ of insulation 1-4 hour;
(5) vulcanizing agent, platinic compound are added in the sizing material secondary back mixing that step (4) is obtained then, obtain the fire-resistant silicon rubber material.
2. fire-resistant silicon rubber as claimed in claim 1 is characterized in that described Zylox is selected methyl vinyl silicone rubber for use; Platinic compound is selected Platinic chloride for use.
3. fire-resistant silicon rubber as claimed in claim 1 is characterized in that described vulcanizing agent is selected from the organo-peroxide at least a.
4. the cable of the said fire-resistant silicon rubber preparation of claim 1 is characterized in that described cable comprises conductor thread core, and conductor thread core is surrounded by the fire-resistant silicon rubber insulation layer outward, and the fire-resistant silicon rubber insulation layer is surrounded by the low smoke and zero halogen restrictive coating outward.
5. cable as claimed in claim 4 is characterized in that, is provided with copper foil layer between said fire-resistant silicon rubber insulation layer and the low smoke and zero halogen restrictive coating.
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