CN113527891B - Flame-retardant B1-grade flexible control cable and preparation method thereof - Google Patents
Flame-retardant B1-grade flexible control cable and preparation method thereof Download PDFInfo
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Abstract
The application provides a high-temperature porcelain-forming silicon rubber composition, a flame-retardant B1-grade flexible control cable and a preparation method thereof, wherein the high-temperature porcelain-forming silicon rubber composition comprises the following components in parts by weight: 25-55 parts of methyl vinyl silicone rubber; 20-30 parts of silicon dioxide; 0.8-5.5 parts of zinc oxide; 0.8-5.5 parts of ferric oxide; 20-40 parts of ceramic powder; 0.1-1 part of lubricant; 2-8 parts of a processing aid; 0.5-3 parts of a crosslinking agent; 0.3-1.5 parts of vulcanizing agent. The formula of the high-temperature porcelain-forming silicon rubber composition has high temperature resistance, good porcelain-forming performance, B1-grade flame retardance, overload incombustibility, fire resistance and no toxicity.
Description
Technical Field
The application relates to the field of electric wires and cables, in particular to a flame-retardant B1-grade flexible control cable and a preparation method thereof.
Background
Currently, the existing flame-retardant B1-grade control cable on the market is a control cable of WDZB1-KYJYP (WDZB1-KYJY) model, and the main structure and the used materials of the cable are as follows:
the conductor adopts 5-class stranded copper wires; the insulating layer is made of low-smoke halogen-free crosslinked polyethylene; the filling layer is made of flame-retardant halogen-free material; the wrapping layer is made of an environment-friendly flame-retardant mineral material; the inner sheath adopts B1-grade flame-retardant low-smoke halogen-free polyolefin (WDZB1-KYJYP type); the shielding layer is made of thin copper wire braided shielding (WDZB1-KYJYP type); the outer sheath adopts B1-grade flame-retardant low-smoke halogen-free polyolefin.
That is, the insulation layer of this conventional cable is made of a crosslinked polyethylene material. The insulating temperature-resistant grade of the crosslinked polyethylene material is 90 ℃. Meanwhile, the cross-linked polyethylene material has high hardness, is not easy to bend, has poor softness and has high laying difficulty in certain specific places due to cross-linking. Furthermore, crosslinked polyethylene is subject to hydrolysis and crosslinked polyethylene itself is not flame retardant.
Therefore, it is necessary to provide a flame retardant B1 grade control cable that is flexible, high in temperature resistance, water resistant, and moisture resistant.
Disclosure of Invention
The application aims to provide a soft, high-temperature-resistant-grade, water-resistant and moisture-proof flame-retardant B1-grade flexible control cable and a preparation method thereof.
In order to achieve the above object, the present application provides the following technical solutions:
the application provides a fire-retardant B1 level flexible control cable, fire-retardant B1 level flexible control cable includes the wire, the outer cladding of wire has inner insulating layer 5, inner insulating layer 5 adopts high temperature porcelain-forming silicon rubber composition preparation.
The high-temperature porcelain-forming silicon rubber composition comprises the following components in parts by weight:
25-55 parts of methyl vinyl silicone rubber;
20-30 parts of silicon dioxide;
1-5 parts of zinc oxide;
1-5 parts of ferric oxide;
20-40 parts of ceramic powder;
0.1-1 part of lubricant;
2-8 parts of a processing aid;
0.5-3 parts of a crosslinking agent;
0.3-1.5 parts of vulcanizing agent.
Preferably, the weight portion of the methyl vinyl silicone rubber is 30-50 portions.
Preferably, the molecular weight of the methyl vinyl silicone rubber is 35 to 48 ten thousand.
Preferably, in the high-temperature porcelain-forming silicone rubber composition, the mass percentage of the methyl vinyl silicone rubber is less than or equal to 50%.
Preferably, the mass ratio of the zinc oxide to the iron oxide to the silicon dioxide is (1-4): (23-28).
Preferably, the methyl vinyl silicone rubber is polymethyl vinyl siloxane;
the ceramic powder is calcium silicate;
the lubricant is selected from at least one of zinc stearate or calcium stearate;
the processing aid is hydroxyl siloxane;
the cross-linking agent is hydrogen-based siloxane;
the vulcanizing agent is a platinum vulcanizing agent.
Preferably, an outer insulating layer 6 is fixedly connected to the outside of an inner insulating layer 5 of the flame-retardant B1-grade flexible control cable, and the outer insulating layer 6 is prepared from a tensile flame-retardant silicone rubber composition, wherein the tensile flame-retardant silicone rubber composition comprises the following components in parts by weight:
45-75 parts of methyl vinyl silicone rubber;
20-45 parts of silicon dioxide;
10-35 parts of nano-grade active pottery clay;
3-10 parts of hydroxyl siloxane;
5-10 parts of a composite efficient flame retardant;
0.5-3 parts of a crosslinking agent;
0.5-2 parts of a vulcanizing agent.
Preferably, the outermost layer of the flame-retardant B1-grade flexible control cable is wrapped by an outer sheath 4, the outer sheath 4 is prepared from a silicon rubber mixed sulfide, and the silicon rubber mixed sulfide comprises the following components in parts by weight:
40-55 parts of methyl vinyl silicone rubber;
28-38 parts of silicon dioxide;
3-8 parts of hydroxyl siloxane;
5-15 parts of calcium silicate;
8-15 parts of a composite efficient flame retardant;
0.5-3 parts of hydrosiloxane;
0.5-2 parts of platinum vulcanizing agent.
The application also provides a preparation method of the flame-retardant B1-grade flexible control cable, which comprises the following steps:
mixing the rubber material at the temperature of less than 80 ℃;
sulfurizing at a temperature of less than 60 ℃:
extruding the wire, wherein the vulcanization temperature of the rubber material is 200-300 ℃, and the extrusion temperature is less than 40 ℃.
Compared with the prior art, the scheme of the application has the following advantages:
1. the high-temperature porcelain-forming silicone rubber composition for the inner insulating layer of the flame-retardant B1-grade flexible control cable adopts methyl vinyl silicone rubber, and has good flexibility. Meanwhile, the high-temperature porcelain-forming silicon rubber composition also has high temperature resistance and good porcelain-forming performance.
2. In the high-temperature porcelain-forming silicone rubber composition for the inner insulating layer of the flame-retardant B1-grade flexible control cable, the molecular weight of methyl vinyl silicone rubber is 35-48 ten thousand, and the strength of the rubber material can be effectively ensured.
3. In the high-temperature porcelain-forming silicon rubber composition for the inner insulating layer of the flame-retardant B1-grade flexible control cable, the mass percent of methyl vinyl silicon rubber is less than or equal to 50%, and the porcelain-forming effect can be effectively ensured.
4. In the high temperature porcelain silicone rubber composition of this application fire-retardant B1 level flexible control cable inner insulating layer, add zinc oxide and iron oxide, can reduce the required temperature of porcelain, in addition, through zinc oxide, iron oxide and silica combined action for the porcelainized layer has certain intensity.
5. The high-temperature porcelain-forming silicone rubber composition for the inner insulating layer of the flame-retardant B1-grade flexible control cable has B1-grade flame retardance, overload incombustibility, fire resistance, no toxicity and good environmental protection performance.
6. According to the flame-retardant B1-grade flexible control cable, the inner insulating layer, the outer insulating layer and the outer sheath are all made of methyl vinyl silicone rubber, so that the cable has good flexibility and is suitable for laying in various complex or special places.
In addition, the inner insulating layer is prepared from a high-temperature porcelain-forming silicon rubber composition, and has high temperature resistance and porcelain forming performance; the outer insulating layer is prepared from a tensile flame-retardant silicone rubber composition, and has high tensile strength performance and high flame retardance; the outer sheath is prepared by mixing silicon rubber with sulfide, and has the advantages of no toxicity, low smoke, high tensile strength, good wear resistance and the like. The materials of the inner insulating layer, the outer insulating layer and the outer sheath enable the flame-retardant B1-grade flexible control cable to have the advantages of being soft, high in temperature-resistant grade, water-resistant and moisture-proof.
7. Although the flame-retardant B1-grade flexible control cable is made of a novel material, the price of the flame-retardant B1-grade flexible control cable is reduced by about 5% compared with that of a traditional B1-grade control cable in the aspect of cost, and the product performance is far superior to that of the traditional control cable and has a huge development prospect.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
FIG. 1 is a schematic structural view of one embodiment of a flame retardant grade B1 flexible control cable of the present application;
FIG. 2 is a schematic structural diagram of another embodiment of a flame retardant grade B1 flexible control cable of the present application.
Detailed Description
The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. In addition, if a detailed description of the known art is not necessary to show the features of the present application, it is omitted.
Referring to fig. 1 and 2, the present application provides a flame-retardant flexible control cable of B1 grade, which includes a conductor coated with an inner insulating layer 5, wherein the inner insulating layer 5 is made of a high-temperature porcelain-forming silicone rubber composition.
The high-temperature porcelain-forming silicon rubber composition comprises the following components in parts by weight:
25-55 parts of methyl vinyl silicone rubber;
20-30 parts of silicon dioxide;
0.8-5.5 parts of zinc oxide;
0.8-5.5 parts of ferric oxide;
20-40 parts of ceramic powder;
0.1-1 part of lubricant;
2-8 parts of a processing aid;
0.5-3 parts of a crosslinking agent;
0.3-1.5 parts of vulcanizing agent.
Preferably, the weight portion of the methyl vinyl silicone rubber is 30-50 portions.
The high-temperature porcelain-forming silicone rubber composition for the inner insulating layer of the flame-retardant B1-grade flexible control cable adopts methyl vinyl silicone rubber, and has good flexibility. In one embodiment of the present application, the methyl vinyl silicone rubber is a gas phase process produced polymethylvinylsiloxane. In one embodiment of the present application, the methyl vinyl silicone rubber has a molecular weight of 35 to 48 ten thousand. In another embodiment of the present application, the methyl vinyl silicone rubber has a molecular weight of 38 to 42 ten thousand. In another embodiment of the present application, the methyl vinyl silicone rubber has a molecular weight of 40 ten thousand. The molecular weight of the methyl vinyl silicone rubber is 35-48 ten thousand, and the strength of the rubber material can be effectively ensured. In one embodiment of the application, in the high-temperature porcelain-forming silicone rubber composition, the mass percentage of the methyl vinyl silicone rubber is less than or equal to 50%, so that the porcelain forming effect can be effectively ensured.
In the high-temperature porcelain-forming silicon rubber composition for the inner insulating layer of the flame-retardant B1-grade flexible control cable, silicon dioxide is used as reinforcing filler, so that the tensile and tear strength of the high-temperature porcelain-forming silicon rubber composition can be enhanced.
In the high-temperature porcelain-forming silicon rubber composition of the inner insulating layer of the flame-retardant B1-grade flexible control cable, zinc oxide and iron oxide are added, so that the temperature required by porcelain forming can be reduced. The porcelainized layer has certain strength through the combined action of zinc oxide, iron oxide and silicon dioxide. In one embodiment of the present application, the mass ratio of zinc oxide, iron oxide and silicon dioxide is (1-4): (23-28). In another embodiment of the present application, the mass ratio of the zinc oxide, the iron oxide and the silicon dioxide is 1:1 (13-15).
The ceramic powder is nano-scale ceramic powder and is selected from one or more of calcium silicate, diatomite, mullite, quartz powder, alumina, bauxite, wollastonite, magnesium hydroxide, zinc borate, mica and other raw materials. In one embodiment of the present application, the ceramifying powder is calcium silicate. The low-melting-point composite porcelain powder can improve the porcelain forming speed and effect, and can quickly form a hard insulating ceramic layer instead of burning ash to fall off during combustion, so that the high-temperature porcelain forming silicon rubber composition of the inner insulating layer of the flame-retardant B1-grade flexible control cable has fire resistance.
In one embodiment of the present application, the lubricant is selected from at least one of zinc stearate or calcium stearate. The zinc stearate and the calcium stearate are used as processing lubricants to improve the processing extrudability of the cable.
In one embodiment of the present application, the processing aid is a hydroxy siloxane. The hydroxyl siloxane as a processing aid can organically combine silicon dioxide molecules with the methyl vinyl silicone rubber, so that the water resistance is improved.
In one embodiment of the present application, the crosslinker is a hydrido siloxane. The hydrogen-based siloxane as a crosslinking agent can promote the degree of crosslinking reaction of the silicone rubber, thereby obtaining a material having good physical properties.
In one embodiment of the present application, the sulfiding agent is a platinum sulfiding agent. Platinum is adopted as a vulcanizing agent, belongs to a food-grade vulcanizing agent, and chemical reactants of the platinum are nontoxic and tasteless in the vulcanizing process.
The formula of the high-temperature porcelain-forming silicone rubber composition for the inner insulating layer of the flame-retardant B1-grade flexible control cable has high temperature resistance and good porcelain-forming performance. Meanwhile, the flame retardant has B1-grade flame retardance, overload incombustibility and fire resistance. And the high-temperature porcelain-forming silicon rubber composition is nontoxic and has good environmental protection performance, and the nontoxicity is mainly reflected by silica gel containing silicon, carbon, hydrogen and oxygen. The high-temperature porcelain-forming silicon rubber composition for the inner insulating layer of the flame-retardant B1-grade flexible control cable has excellent non-flaming-droplet characteristics due to the fact that the high-temperature porcelain-forming silicon rubber composition contains a vulcanization solid material and porcelain-forming property. In addition, it possesses excellent tear resistance.
In the flame-retardant B1-grade flexible control cable, an outer insulating layer 6 is fixedly connected to the outside of an inner insulating layer 5, the outer insulating layer 6 is prepared from a tensile flame-retardant silicone rubber composition, and the tensile flame-retardant silicone rubber composition comprises the following components in parts by weight:
45-75 parts of methyl vinyl silicone rubber;
20-45 parts of silicon dioxide;
10-35 parts of nano active pottery clay;
3-10 parts of hydroxyl siloxane;
5-10 parts of a composite efficient flame retardant;
0.5-3 parts of a crosslinking agent;
0.5-2 parts of a vulcanizing agent.
Preferably, the weight part of the methyl vinyl silicone rubber is 50-70 parts.
The tensile flame-retardant silicone rubber composition adopts methyl vinyl silicone rubber, and has good flexibility, high temperature resistance and good porcelain forming performance. After the nano-level active argil is adopted for active treatment, the dispersion and combination performance of the nano-level active argil and silica gel can be enhanced, and the strength of the tensile flame-retardant silicone rubber composition is effectively improved. The silica serves as a reinforcing filler capable of enhancing the tensile tear strength of the tensile flame retardant silicone rubber composition. The flame retardant effect is improved by using the composite efficient flame retardant.
In one embodiment of the present application, the methyl vinyl silicone rubber has a molecular weight of 35 to 48 ten thousand. In another embodiment of the present application, the methyl vinyl silicone rubber has a molecular weight of 38 to 42 ten thousand. In another embodiment of the present application, the methyl vinyl silicone rubber has a molecular weight of 40 ten thousand. The molecular weight of the methyl vinyl silicone rubber is 35-48 ten thousand, and the strength of the rubber material can be effectively ensured.
In one embodiment of the present application, in the tensile flame-retardant silicone rubber composition, the mass percentage of the methyl vinyl silicone rubber is greater than or equal to 50% to ensure an insulation resistance value.
In one embodiment herein, the mass ratio of the hydroxy siloxane to the silica is 1 (10-18). The hydroxyl siloxane as a processing aid can improve the organic combination of silicon dioxide molecules and methyl vinyl silicone rubber so as to improve the water resistance.
In one embodiment of the present application, the methyl vinyl silicone rubber is polymethylvinylsiloxane.
In one embodiment of the present application, the lubricant is selected from at least one of zinc stearate or calcium stearate.
In one embodiment of the application, the composite high-efficiency flame retardant adopts a material with an oxygen index of more than or equal to 38. The composite efficient flame retardant is used to enable the oxygen index of the material to reach more than 38, and has good flame retardant effect.
In one embodiment of the present application, the crosslinker is a hydrido siloxane. The hydrogen-based siloxane as a crosslinking agent can promote the degree of crosslinking reaction of the silicone rubber, thereby obtaining a material having good physical properties.
In one embodiment of the present application, the sulfiding agent is a platinum sulfiding agent. Platinum is adopted as a vulcanizing agent, belongs to a food-grade vulcanizing agent, and chemical reactants of the platinum are nontoxic and tasteless in the vulcanizing process.
The formula of the tensile flame-retardant silicone rubber composition has high temperature resistance and good porcelain forming performance. Meanwhile, the flame retardant has B1-grade flame retardance, overload incombustibility and fire resistance. And the tensile flame-retardant silicone rubber composition is nontoxic and has good environmental protection performance, and the nontoxicity is mainly reflected in that the tensile flame-retardant silicone rubber composition is silica gel containing silicon, carbon, hydrogen and oxygen. The tensile flame-retardant silicone rubber composition has excellent non-dripping characteristics because of the self-contained vulcanized solid material and ceramic forming property. In addition, it possesses excellent tear resistance.
Further, the outermost layer of the flame-retardant B1-grade flexible control cable is wrapped by an outer sheath 4, the outer sheath 4 is prepared from a silicon rubber mixed sulfide, and the silicon rubber mixed sulfide comprises the following components in parts by weight:
40-55 parts of methyl vinyl silicone rubber;
28-38 parts of silicon dioxide;
3-8 parts of hydroxyl siloxane;
5-15 parts of calcium silicate;
8-15 parts of a composite efficient flame retardant;
0.5-3 parts of hydrosiloxane;
0.5-2 parts of platinum vulcanizing agent.
In one embodiment of the present application, the methyl vinyl silicone rubber is a gas phase process produced polymethylvinylsiloxane. In one embodiment of the present application, the methyl vinyl silicone rubber has a molecular weight of 35 to 48 ten thousand. In another embodiment of the present application, the methyl vinyl silicone rubber has a molecular weight of 38 to 42 ten thousand. In another embodiment of the present application, the methyl vinyl silicone rubber has a molecular weight of 40 ten thousand. The molecular weight of the methyl vinyl silicone rubber is 35-48 ten thousand, and the strength of the rubber material can be effectively ensured.
In one embodiment herein, the hydrido siloxane functions as a flame retardant. The silicon dioxide is used as reinforcing filling to strengthen the tensile and tear resistance of the mixed glue. The hydroxyl siloxane is used as a processing aid, so that silicon dioxide molecules and polymethyl vinyl siloxane can be organically combined, and the overall performance is improved. The calcium silicate can enable the sizing material to have certain crusting property during combustion, further improve flame retardance, and meanwhile, the burning dripping particles are not generated. The use of the composite efficient flame retardant enables the oxygen index of the material to reach more than 40, and the material has good flame retardant effect. The hydrogen-based siloxane is used as a crosslinking agent to promote the crosslinking reaction degree of the silicone rubber to obtain good physical properties. Platinum is used as a vulcanizing agent, and chemical reactants in the vulcanizing process are nontoxic and tasteless.
Referring to fig. 1 and 2, in another embodiment of the present application, the flame retardant B1 grade flexible control cable further comprises an inner sheath 3 structure, the inner sheath 3 also being prepared from the above-mentioned silicone rubber vulcanizate.
In one embodiment of the application, the inner insulating layer 5 of the flame-retardant B1-grade flexible control cable is prepared from a high-temperature porcelain-forming silicon rubber composition and has high temperature resistance and porcelain-forming performance; the outer insulating layer 6 is prepared from a tensile flame-retardant silicone rubber composition and has high tensile strength performance and high flame retardance; the outer sheath 4 is prepared by mixing silicon rubber with sulfide, and has the advantages of no toxicity, low smoke, high tensile strength, good wear resistance and the like. The materials of the inner insulating layer 5, the outer insulating layer 6 and the outer sheath 4 enable the flame-retardant B1-grade flexible control cable to have the advantages of being soft, high in temperature resistance level, water-resistant and moisture-proof.
In one embodiment of the application, the flame-retardant flexible control cable of the B1 level, the inner insulating layer 5, the outer insulating layer 6, the inner sheath 3 and the outer sheath 4 all use methyl vinyl silicone rubber as sizing materials, so that the cable has good flexibility and is suitable for being laid in various complicated or special places.
The application also provides a preparation method of the flame-retardant B1-grade flexible control cable, which comprises the following steps:
mixing the rubber material at the temperature of less than 80 ℃;
sulphurizing at a temperature of less than 60 ℃:
extruding the wire, wherein the vulcanization temperature of the rubber material is 200-300 ℃, and the extrusion temperature is less than 40 ℃.
Specifically, in the preparation process of the flame-retardant B1-grade flexible control cable, the temperature is controlled to be lower than 80 ℃ in the rubber mixing process; controlling the temperature to be lower than 60 ℃ in the vulcanizing process, and controlling the time to be less than 3 min; the vulcanizing temperature of the rubber material is controlled between 200 ℃ and 300 ℃ during the extrusion of the wire.
The effects of the high temperature porcelain-forming silicone rubber composition of the inner insulating layer of the flame retardant grade B1 flexible control cable and the flame retardant grade B1 flexible control cable of the present application are verified by several examples and comparative examples of the flame retardant grade B1 flexible control cable.
First, the flame retardant B1 grade flexible control cable includes inner and outer insulation layers 5 and 6, and inner and outer sheaths 3 and 4. Depending on the cable construction, the examples and comparative examples of the different component formulations are referred to in sequence in tables 1 to 3.
Table 1 examples and comparative examples of flame retardant B1 grade flexible control cable inner insulation layer component formulations
Table 2 examples and comparative examples of flame retardant B1 grade flexible control cable outer insulation layer component formulations
Table 3 examples and comparative examples of flame retardant B1 grade flexible control cable inner and outer jacket composition formulations
Several examples and comparative examples of flame retardant grade B1 flexible control cables were obtained by combining the above examples and comparative examples of different materials with the corresponding structures of flame retardant grade B1 flexible control cables, as shown in table 4:
table 4 examples and comparative examples of flame retardant B1 grade flexible control cables
The following verification of the performance was made on the effects of the flame retardant B1 grade flexible control cables of the examples and comparative examples.
And (3) softness testing: and (3) performing an elastic modulus test, wherein the test standard is ASTM D790-03, the test conditions are 25 +/-2 ℃, and the elastic modulus standard is 2.5-4.2 Mpa.
Tensile strength: the tensile strength was tested by means of a tensile machine. According to the requirement of GB12706.1-2008 standard, the tensile strength standard of the cable is 9.0MPa, the tensile strength exceeds the requirement value of the standard, and the surface wire has excellent tensile capacity.
Fire resistance: fire resistance tests were conducted on the fire retardant B1 grade flexible control cables of the examples and comparative examples to simulate the burning of the wire in a fire situation. Taking a cable with the length of 100cm, fixing the cable in a combustion test box, carrying out a combustion test with the test standard of BS6387-2013, the flame temperature of 950 ℃, and the combustion of 3H, and detecting whether the cable is short-circuited. If the cable does not have the short circuit phenomenon, the cable can persist for 3 hours in a fire disaster and the short circuit phenomenon can not occur, and secondary damage to the environment and personal safety can not be caused.
Temperature resistance, insulation, water resistance and moisture resistance: 10M of insulating core wire is taken and placed in a constant temperature water tank to see whether the insulating water boiling requirement of 60 ℃ 400h 2000 Momega km is met or not.
The results of the performance measurements are shown in table 5.
TABLE 5
From the above, it can be seen that:
first, the flame retardant B1 grade flexible control cables of examples a1, a2 and A3 in the present application have better flexibility and higher tensile strength than the conventional cables of comparative example a1 (the molecular weight of the methyl vinyl silicone rubber used for the inner insulating layer 5 is about 50 ten thousand), comparative example a2 (the mass percentage ratio of the methyl vinyl silicone rubber in the high temperature porcelain silicone rubber composition used for the inner insulating layer 5 exceeds 50%) and comparative example A3 (the high temperature porcelain silicone rubber composition used for the inner insulating layer 5 does not contain the zinc oxide and the iron oxide in the present ratio). Meanwhile, the flame-retardant B1-grade flexible control cable has good softness, good tensile strength, good fire resistance and excellent insulating, water-resistant and moisture-proof properties.
The high-temperature porcelain-forming silicone rubber composition for the inner insulating layer of the flame-retardant B1-grade flexible control cable adopts the methyl vinyl silicone rubber, the molecular weight of the methyl vinyl silicone rubber is kept between 35 and 48 ten thousand, the mass percent of the methyl vinyl silicone rubber is less than or equal to 50 percent, and meanwhile, the zinc oxide and the iron oxide are added, so that when the high-temperature porcelain-forming silicone rubber composition for the inner insulating layer of the flame-retardant B1-grade flexible control cable is used for preparing the cable, the cable with good tensile strength and good flexibility can be prepared, and the high-temperature porcelain-forming silicone rubber composition has the advantages of good temperature resistance, B1-grade flame retardance and fire resistance.
Second, the flame retardant B1 grade flexible control cables of examples B1, B2, and B3 according to the present application have better flexibility and higher tensile strength than comparative examples B1 (the molecular weight of the methyl vinyl silicone rubber used for the outer insulating layer 6 is about 50 ten thousand) and comparative examples B2 (the mass percentage ratio of the methyl vinyl silicone rubber in the tensile flame retardant silicone rubber composition used for the outer insulating layer 6 is less than 50%). Meanwhile, compared with the common cable of the comparative example B3 (the tensile flame-retardant silicon rubber composition adopted by the outer insulating layer 6 does not contain the nano-scale activated clay in the proportion of the application), the control cable with the flame-retardant B1-grade silicon rubber insulating polyolefin sheath has obviously higher tensile strength. The control cable of the flame-retardant grade B1 silicone rubber insulating polyolefin sheath does not meet the requirement of 60 ℃ 400h 2000M omega km for insulating water boiling relative to the control cable of the comparative example B4 (the mass ratio of the hydroxyl siloxane and the silicon dioxide in the tensile flame-retardant silicone rubber composition adopted by the outer insulating layer 6 is not in the ratio range defined by the application). Meanwhile, the flame-retardant B1-grade flexible control cable has good softness, good tensile strength, good fire resistance and excellent insulating, water-resistant and moisture-proof properties.
The tensile flame-retardant silicone rubber composition is prepared by adopting the methyl vinyl silicone rubber, the molecular weight of the methyl vinyl silicone rubber is kept between 35 and 48 million, the mass percent of the methyl vinyl silicone rubber is more than or equal to 50 percent, and meanwhile, the hydroxyl siloxane is added to be used as a processing aid to improve the organic combination of the silicon dioxide molecules and the methyl vinyl silicone rubber, so that when the tensile flame-retardant silicone rubber composition is used for preparing cables, the cables with good tensile strength and flexibility can be prepared, and the tensile flame-retardant silicone rubber composition has the advantages of good temperature resistance, good waterproof performance, B1-grade flame retardance and good fire resistance.
Third, the flame retardant B1 grade flexible control cables of examples C1, C2, and C3 of the present application had better flexibility and higher tensile strength than the comparative example C1 (the molecular weight of the methyl vinyl silicone rubber used for the inner and outer sheaths 3 and 4 was about 50 ten thousand).
The silicone rubber mixed sulfide is prepared from the methyl vinyl silicone rubber, and the molecular weight of the methyl vinyl silicone rubber is kept between 35 and 48 ten thousand, so that the silicone rubber mixed sulfide can be used for preparing cables with good tensile strength and flexibility, and has the advantages of temperature resistance, B1-grade flame retardance and fire resistance.
In conclusion, the high-temperature porcelain-forming silicone rubber composition for the inner insulating layer of the flame-retardant B1-grade flexible control cable has good flexibility, temperature resistance and high tensile strength, and also has B1-grade flame retardance, overload incombustibility, flame resistance and no toxicity. In the flame-retardant B1-grade flexible control cable, the inner insulating layer 5 is prepared from a high-temperature porcelain-forming silicon rubber composition, and has high temperature resistance and porcelain forming performance; the outer insulating layer 6 is prepared from a tensile flame-retardant silicone rubber composition and has high tensile strength performance and high flame retardance; the outer sheath 4 is prepared by mixing silicon rubber with sulfide, and has the advantages of no toxicity, low smoke, high tensile strength, good wear resistance and the like. The inner insulating layer 5, the outer insulating layer 6 and the outer sheath 4 all use methyl vinyl silicone rubber as sizing materials, so that the cable has good flexibility and is suitable for laying in various complex or special places. The materials of the inner insulating layer 5, the outer insulating layer 6 and the outer sheath 4 enable the flame-retardant B1-grade flexible control cable to have the advantages of being soft, high in temperature resistance level, water-resistant and moisture-proof.
The foregoing is only a partial 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 principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (7)
1. The flame-retardant B1-grade flexible control cable is characterized by comprising a lead, wherein an inner insulating layer (5) is coated outside the lead, and the inner insulating layer (5) is prepared from a high-temperature porcelain-forming silicon rubber composition;
the high-temperature porcelain-forming silicon rubber composition comprises the following components in parts by weight:
25-55 parts of methyl vinyl silicone rubber;
20-30 parts of silicon dioxide;
1-5 parts of zinc oxide;
1-5 parts of ferric oxide;
20-40 parts of ceramic powder;
0.1-1 part of lubricant;
2-8 parts of a processing aid;
0.5-3 parts of a crosslinking agent;
0.3-1.5 parts of vulcanizing agent;
in the high-temperature porcelain-forming silicon rubber composition, the molecular weight of the methyl vinyl silicon rubber is 35-48 ten thousand; the mass percentage of the methyl vinyl silicone rubber is less than or equal to 50 percent.
2. The flame-retardant flexible control cable of grade B1 according to claim 1, wherein the high-temperature porcelain-forming silicone rubber composition contains 30-50 parts by weight of methyl vinyl silicone rubber.
3. The flame retardant flexible control cable of grade B1 of claim 1, wherein the high temperature porcelain silicone rubber composition has a mass ratio of zinc oxide, iron oxide and silicon dioxide of (1-4): 23-28.
4. The flame retardant flexible control cable of grade B1 of claim 1, wherein in the high temperature porcelain silicone rubber composition, the methyl vinyl silicone rubber is polymethyl vinyl siloxane;
the ceramic powder is calcium silicate;
the lubricant is selected from at least one of zinc stearate or calcium stearate;
the processing aid is hydroxyl siloxane;
the cross-linking agent is hydrogen-based siloxane;
the vulcanizing agent is a platinum vulcanizing agent.
5. The flame-retardant flexible control cable of grade B1 as defined in claim 1, wherein an outer insulating layer (6) is fixedly attached to the outside of the inner insulating layer (5), and the outer insulating layer (6) is prepared from a tensile flame-retardant silicone rubber composition comprising the following components in parts by weight:
45-75 parts of methyl vinyl silicone rubber;
20-45 parts of silicon dioxide;
10-35 parts of nano-grade active pottery clay;
3-10 parts of hydroxyl siloxane;
5-10 parts of a composite efficient flame retardant;
0.5-3 parts of a crosslinking agent;
0.5-2 parts of a vulcanizing agent;
in the tensile flame-retardant silicone rubber composition, the molecular weight of the methyl vinyl silicone rubber is 35-48 ten thousand; the mass percentage of the methyl vinyl silicone rubber is more than or equal to 50 percent; the mass ratio of the hydroxyl siloxane to the silicon dioxide is 1 (10-18).
6. The flame-retardant flexible control cable of grade B1 according to claim 1, wherein an outer sheath (4) wraps the outermost layer of the flame-retardant flexible control cable of grade B1, the outer sheath (4) is prepared from a silicone rubber mixed sulfide, and the silicone rubber mixed sulfide comprises the following components in parts by weight:
40-55 parts of methyl vinyl silicone rubber;
28-38 parts of silicon dioxide;
3-8 parts of hydroxyl siloxane;
5-15 parts of calcium silicate;
8-15 parts of a composite efficient flame retardant;
0.5-3 parts of hydrosiloxane;
0.5-2 parts of platinum vulcanizing agent;
in the silicon rubber mixed sulfide, the molecular weight of the methyl vinyl silicon rubber is 35-48 ten thousand.
7. The method for preparing the flame-retardant flexible control cable grade B1 according to any one of claims 1-6, wherein the method comprises the following steps:
mixing the rubber material at the temperature of less than 80 ℃;
sulphurizing at a temperature of less than 60 ℃:
extruding the wire, wherein the vulcanization temperature of the rubber material is 200-300 ℃, and the extrusion temperature is less than 40 ℃.
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| CN105860536A (en) * | 2016-04-13 | 2016-08-17 | 山东兆圭高分子材料科技有限公司 | Flame-retardant and fire-resistant ceramic silicone rubber and preparation method thereof |
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