CN116948386B - Flame-retardant composite cable material and preparation method and application thereof - Google Patents
Flame-retardant composite cable material and preparation method and application thereof Download PDFInfo
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 239000003063 flame retardant Substances 0.000 title claims abstract description 95
- 239000000463 material Substances 0.000 title claims abstract description 83
- 239000002131 composite material Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 239000000945 filler Substances 0.000 claims abstract description 40
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 22
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims abstract description 19
- 229920001084 poly(chloroprene) Polymers 0.000 claims abstract description 19
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims abstract description 19
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229920002050 silicone resin Polymers 0.000 claims abstract description 13
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- 239000004568 cement Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims description 51
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 claims description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 14
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- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- -1 tertiary butyl phenol amine Chemical class 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- WJQOZHYUIDYNHM-UHFFFAOYSA-N 2-tert-Butylphenol Chemical compound CC(C)(C)C1=CC=CC=C1O WJQOZHYUIDYNHM-UHFFFAOYSA-N 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- GRXKLBBBQUKJJZ-UHFFFAOYSA-N Soman Chemical compound CC(C)(C)C(C)OP(C)(F)=O GRXKLBBBQUKJJZ-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 229910052588 hydroxylapatite Inorganic materials 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
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- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/56—Extraction of image or video features relating to colour
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/70—Arrangements for image or video recognition or understanding using pattern recognition or machine learning
- G06V10/74—Image or video pattern matching; Proximity measures in feature spaces
- G06V10/75—Organisation of the matching processes, e.g. simultaneous or sequential comparisons of image or video features; Coarse-fine approaches, e.g. multi-scale approaches; using context analysis; Selection of dictionaries
- G06V10/758—Involving statistics of pixels or of feature values, e.g. histogram matching
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/302—Polyurethanes or polythiourethanes; Polyurea or polythiourea
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2258—Oxides; Hydroxides of metals of tungsten
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
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Abstract
The invention discloses a flame-retardant composite cable material, a preparation method and application thereof, and relates to the technical field of composite cable materials, wherein the flame-retardant composite cable material comprises the following components in parts by weight: 15-25 parts of thermoplastic polyurethane, 10-20 parts of neoprene, 5-15 parts of silicone resin, 5-10 parts of aluminum cement, 2-5 parts of flame retardant and 40-50 parts of filler. Wherein the flame retardant comprises zinc borate and aluminum hydroxide, and the weight percentage of the aluminum hydroxide in the flame retardant is 50-70%. According to the invention, zinc borate and aluminum hydroxide added in the preparation process are compounded, so that the heat insulation and the prevention of air diffusion inside human materials are facilitated, a good flame retardant effect is achieved, the heat conduction performance is good, the heat can be rapidly dissipated, and the inside of the cable can be effectively protected from being damaged by high temperature.
Description
Technical Field
The invention relates to the technical field of composite cable materials, in particular to a flame-retardant composite cable material and a preparation method and application thereof.
Background
The cable material plays a vital role in industrial production and daily life of people, and the flame-retardant cable material has important significance in application.
At present, various flame-retardant cable materials are researched and applied at home and abroad, but the problems of high cost, difficult processing and insufficient flame retardant property still exist.
The nano composite type insulating flame-retardant cable material disclosed in China patent with the publication number of CN107365458A is prepared by taking MCM-22 raw powder, low-density polyethylene, polystyrene, tertiary butyl phenol, phenolic resin, hydroxyapatite, N-ethyl-N-phenyl zinc dithiocarbamate and ethylene propylene rubber as main raw materials, carrying out LDH metal ion exchange on the MCM-22 nano material and then modifying the MCM-22 nano material by using the low-density polyethylene, and compounding tertiary butyl phenol amine resin and a polyolefin modified material to prepare the green and environment-friendly nano insulating cable material; according to the patent, the MCM-22 nano material is subjected to LDH metal ion exchange and then modified by low-density polyethylene, and tert-butylphenol amine resin is compounded with the polyolefin modified material, so that one part of the MCM-22 nano material can generate more inorganic nano insulating components, the other part of the MCM-22 nano material improves the charge flow, the average breakdown strength is increased, and the process index is improved. However, the preparation process is complex and difficult, time-consuming, labor-consuming and high in cost. Based on the above, the invention provides a flame-retardant composite cable material, a preparation method and application thereof to solve the problems.
Disclosure of Invention
The invention aims to provide a flame-retardant composite cable material, a preparation method and application thereof, wherein the prepared material has various excellent characteristics by adopting a synthetic material, and the flame retardance of the prepared material is improved to the greatest extent by adopting zinc borate and aluminum hydroxide as flame retardant auxiliary agents, so that the integral use safety of the material is correspondingly improved.
In order to achieve the above effects, the present invention provides the following technical solutions:
the flame-retardant composite cable material comprises the following components in parts by weight:
wherein the flame retardant comprises zinc borate and aluminum hydroxide, and the weight percentage of the aluminum hydroxide in the flame retardant is 50-70%.
Further, the filler is silica.
Further, the fineness of the silica is 5-60 μm.
Further, the filler also comprises nano tungsten trioxide, and the weight percentage of the nano tungsten trioxide in the filler is 20-30%.
The invention also provides a preparation method of the flame-retardant composite cable material, which comprises the following steps:
s1, placing thermoplastic polyurethane and chloroprene rubber in a specified weight part into a double-roll open mill for blending, firstly placing the thermoplastic polyurethane into the open mill for melt vulcanization, then gradually adding the chloroprene rubber, and cutting and mixing uniformly for a plurality of times;
s2, adding the mixture prepared in the step S1, silicone resin and aluminum cement in the specified weight parts into a mixing kettle, uniformly stirring, adding a flame retardant and a filler, and ensuring full mixing;
s3, pouring out the mixture which is uniformly mixed in the mixing kettle, and carrying out preliminary curing and molding;
s4, placing the material subjected to preliminary curing molding into a double-screw extruder for high-temperature extrusion to form granular materials;
and S5, conveying the extruded material into cooling forming equipment for cooling forming to obtain the flame-retardant composite cable material.
Further, in step S1, the melt vulcanization temperature is 80 ℃ and the required time is 10min.
Further, in step S4, the temperature of the high-temperature extrusion is 250 ℃.
Further, in step S5, the cooling molding temperature is 50 ℃.
Further, in step S2, the specific steps of adding the flame retardant additive and the filler after stirring uniformly and ensuring sufficient mixing are as follows:
s201: adding a flame retardant and a filler into a mixing kettle, mixing and stirring, standing for 2 minutes after stirring for 10 minutes, performing image acquisition on the mixture after mixing and stirring by using an image acquisition device, introducing the acquired image into image analysis software to divide pixels, extracting chromaticity of each pixel, and extracting chromaticity sequence (x) 1 ,x 2 ,x 3 ,....,x n ) Wherein x is i The chromaticity value of the ith pixel point is n, the number of the pixel points is n, and the average value of the chromaticity of the pixel points is obtained
S202, calculating a variance value of chromaticity of the mixed pixel pointsSubstituting variance value and average value into the formula of uniform value calculation +.>Obtain a uniform value, wherein a 1 As average duty ratio coefficient, a 2 For the variance value duty cycle, 1=a 1 +a 2 ，x max Maximum value of safety value, x, which is the average value of chromaticity min Minimum value, k, of the safety value, which is the average of the chromaticity max Is the maximum value, k, of the safety value of the variance value of the chromaticity min The minimum value of the safety value which is the variance value of the chromaticity;
s203, comparing the calculated uniformity value with a set uniformity threshold, if the uniformity value is larger than the set uniformity threshold, continuing stirring, standing for 2 minutes after stirring for 10 minutes, continuing testing, and if the uniformity value is smaller than the set uniformity threshold, fully mixing.
The invention also provides application of the flame-retardant composite cable material in production of the flame-retardant composite cable material.
The invention has the beneficial effects that:
1. the added zinc borate serving as a flame retardant is melted at high temperature to form a glassy coating, and then is dehydrated at high temperature, so that the combustion self-extinguishment is facilitated due to the evaporation heat of water and other effects of water vapor, the dehydrated zinc borate can promote the generation of an inorganic carbon layer, is difficult to ignite and burn, and has an isolation effect; the zinc borate can generate hard porous residues similar to glass and ceramic with the aluminum hydroxide as the flame retardant added by the invention, thereby being beneficial to heat insulation and preventing air from diffusing into the material. The zinc borate and the aluminum hydroxide are low in material cost, smoke generation amount and toxicity, the flame retardance and insulativity of the zinc borate and the aluminum hydroxide are greatly improved, a good synergistic flame retardant effect is achieved, and the overall fire risk and the overall danger are greatly reduced in the use process.
2. The filler comprises silicon dioxide and nano tungsten trioxide, and the nano tungsten trioxide improves the heat resistance and compactness of the composite material.
3. By compounding a plurality of materials, the composite modified material has excellent mechanical properties and can bear high-strength stretching and bending.
4. The invention has simple preparation and low cost, is suitable for large-scale production, and can greatly reduce the preparation cost on the basis of improving the overall comprehensive use performance of the material.
5. According to the invention, the mixed images are acquired, and the calculation of the mixing uniformity is carried out, so that the mixed effect after mixing is researched and judged, the mixing quality and effect are further ensured, and the flame retardant property of the prepared composite cable material is more excellent.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Drug sources:
thermoplastic polyurethane: injection-molded grade thermoplastic polyurethane of basf EB85A from shanghai plastic materials limited.
Neoprene: neoprene rubber with 99% hplc purity was purchased from beijing company of chemical summer.
Silicone resin: a high temperature resistant silicone resin available from dakaning 805 of soman trade limited, guangzhou.
Nano tungsten trioxide: and (3) nano tungsten trioxide with the specification of 99.9%metals basis and 100nm of Beijing Yinuoki company.
Example 1
The flame-retardant composite cable material comprises the following components in parts by weight: 18 parts of thermoplastic polyurethane, 12 parts of neoprene, 10 parts of silicone resin, 8 parts of aluminum cement, 4 parts of flame retardant and 43 parts of filler, wherein the flame retardant comprises zinc borate and aluminum hydroxide, and the weight percentage of the aluminum hydroxide in the flame retardant is 50%. The filler is silicon dioxide and nano tungsten trioxide, the fineness of the silicon dioxide is 10 mu m, and the weight percentage of the nano tungsten trioxide in the filler is 20%.
The preparation method of the flame-retardant composite cable material comprises the following steps:
s1, placing 18 parts of thermoplastic polyurethane and 12 parts of chloroprene rubber into a double-roll open mill for blending, firstly placing the thermoplastic polyurethane into the open mill for melt vulcanization, then gradually adding the chloroprene rubber, and cutting and mixing uniformly for many times;
s2, adding the mixture prepared in the step S1, 10 parts of silicone resin and 8 parts of aluminum cement into a mixing kettle, uniformly stirring, and then adding 4 parts of flame retardant and 43 parts of filler, and ensuring full mixing;
s3, pouring out the mixture which is uniformly mixed in the mixing kettle, and carrying out preliminary curing and molding;
s4, placing the material subjected to preliminary curing molding into a double-screw extruder, and extruding at a high temperature of 250 ℃ to form a granular material;
and S5, conveying the extruded material into cooling forming equipment for cooling forming, wherein the temperature of the cooling forming is 50 ℃, and then obtaining the flame-retardant composite cable material.
Further, in step S2, the specific steps of adding the flame retardant additive and the filler after stirring uniformly and ensuring sufficient mixing are as follows:
s201: adding a flame retardant and a filler into a mixing kettle, mixing and stirring, standing for 2 minutes after stirring for 10 minutes, performing image acquisition on the mixture after mixing and stirring by using an image acquisition device, introducing the acquired image into image analysis software to divide pixels, extracting chromaticity of each pixel, and extracting chromaticity sequence (x) 1 ,x 2 ,x 3 ,....,x n ) Wherein x is i The chromaticity value of the ith pixel point is n, the number of the pixel points is n, and the average value of the chromaticity of the pixel points is obtained
For this step the invention was operated by the specific example with a collected chromaticity sequence (7.10,7.15,7.24,7.23,7.24,7.23,7.25,7.38,7.37) and a chromaticity average of 7.24;
s202, calculating a variance value of chromaticity of the mixed pixel pointsSubstituting variance value and average value into the formula of uniform value calculation +.>Obtain a uniform value, wherein a 1 As average duty ratio coefficient, a 2 For the variance value duty cycle, 1=a 1 +a 2 ，x max Maximum value of 7.64, x, which is the safety value of the chrominance mean min Minimum value of 7.10, k, which is the safety value of the chrominance mean max Maximum value of safety value of variance value of chromaticity 0.0084, k min A minimum value of 0.0068, the safety value of the variance value of chromaticity, herea 1 ＝0.12,a 2 ＝0.88；
The calculated chromaticity variance value is 0.0072, and the calculated chromaticity variance value is substituted into a uniform value calculation formula to obtain a uniform value as follows: 0.32;
s203, comparing the calculated uniform value with a set uniform threshold, if the uniform value is larger than the set uniform threshold, continuing stirring, standing for 2 minutes after stirring for 10 minutes, continuing testing, and if the uniform value is smaller than the set uniform threshold, fully mixing;
in this example, uniformity of 0.32 was calculated to be less than the set uniformity threshold of 0.352, so stirring was sufficient.
Example 2
The flame-retardant composite cable material comprises the following components in parts by weight: 15 parts of thermoplastic polyurethane, 10 parts of neoprene, 5 parts of silicone resin, 5 parts of aluminum cement, 2 parts of flame retardant and 40 parts of filler, wherein the flame retardant comprises zinc borate and aluminum hydroxide, and the weight percentage of the aluminum hydroxide in the flame retardant is 50%. The filler is silicon dioxide and nano tungsten trioxide, the fineness of the silicon dioxide is 15 mu m, and the weight percentage of the nano tungsten trioxide in the filler is 20%.
The preparation method of the flame-retardant composite cable material comprises the following steps:
s1, putting 15 parts of thermoplastic polyurethane and 10 parts of chloroprene rubber into a double-roll open mill for blending, firstly putting the thermoplastic polyurethane into the open mill for melt vulcanization, then gradually adding the chloroprene rubber, and cutting and mixing uniformly for many times;
s2, adding the mixture prepared in the step S1, 5 parts of silicone resin and 5 parts of aluminum cement into a mixing kettle, uniformly stirring, adding 2 parts of flame retardant and 40 parts of filler, and ensuring full mixing;
s3, pouring out the mixture which is uniformly mixed in the mixing kettle, and carrying out preliminary curing and molding;
s4, placing the material subjected to preliminary curing molding into a double-screw extruder, and extruding at a high temperature of 250 ℃ to form a granular material;
and S5, conveying the extruded material into cooling forming equipment for cooling forming, wherein the temperature of the cooling forming is below 50 ℃, and then obtaining the flame-retardant composite cable material.
Example 3
The flame-retardant composite cable material comprises the following components in parts by weight: 25 parts of thermoplastic polyurethane, 20 parts of neoprene, 15 parts of silicone resin, 10 parts of aluminum cement, 5 parts of flame retardant and 50 parts of filler, wherein the flame retardant comprises zinc borate and aluminum hydroxide, and the weight percentage of the aluminum hydroxide in the flame retardant is 70%. The filler is silicon dioxide and nano tungsten trioxide, the fineness of the silicon dioxide is 50 mu m, and the weight percentage of the nano tungsten trioxide in the filler is 30%.
The preparation method of the flame-retardant composite cable material comprises the following steps:
s1, putting 25 parts of thermoplastic polyurethane and 20 parts of chloroprene rubber into a double-roll open mill for blending, firstly putting the thermoplastic polyurethane into the open mill for melt vulcanization, then gradually adding the chloroprene rubber, and cutting and mixing uniformly for many times;
s2, adding the mixture prepared in the step S1, 15 parts of silicone resin and 10 parts of aluminum cement into a mixing kettle, uniformly stirring, and then adding 5 parts of flame retardant and 50 parts of filler, and ensuring full mixing;
s3, pouring out the mixture which is uniformly mixed in the mixing kettle, and carrying out preliminary curing and molding;
s4, placing the material subjected to preliminary curing molding into a double-screw extruder, and extruding at a high temperature of 250 ℃ to form a granular material;
and S5, conveying the extruded material into cooling forming equipment for cooling forming, wherein the temperature of the cooling forming is 50 ℃, and then obtaining the flame-retardant composite cable material.
Example 4
The flame-retardant composite cable material comprises the following components in parts by weight: 20 parts of thermoplastic polyurethane, 15 parts of neoprene, 12 parts of silicone resin, 7 parts of aluminum cement, 3 parts of flame retardant and 45 parts of filler, wherein the flame retardant comprises zinc borate and aluminum hydroxide, and the weight percentage of the aluminum hydroxide in the flame retardant is 60%. The filler is silicon dioxide and nano tungsten trioxide, the fineness of the silicon dioxide is 30 mu m, and the weight percentage of the nano tungsten trioxide in the filler is 24%.
The preparation method of the flame-retardant composite cable material comprises the following steps:
s1, placing 20 parts of thermoplastic polyurethane and 15 parts of chloroprene rubber into a double-roll open mill for blending, firstly placing the thermoplastic polyurethane into the open mill for melt vulcanization, then gradually adding the chloroprene rubber, and cutting and mixing uniformly for many times;
s2, adding the mixture prepared in the step S1, 12 parts of silicone resin and 7 parts of aluminum cement into a mixing kettle, uniformly stirring, adding 3 parts of flame retardant and 45 parts of filler, and ensuring full mixing;
s3, pouring out the mixture which is uniformly mixed in the mixing kettle, and carrying out preliminary curing and molding;
s4, placing the material subjected to preliminary curing molding into a double-screw extruder, and extruding at a high temperature of 250 ℃ to form a granular material;
and S5, conveying the extruded material into cooling forming equipment for cooling forming, wherein the temperature of the cooling forming is 50 ℃, and then obtaining the flame-retardant composite cable material.
Comparative example 1
The difference from example 1 is that: the flame retardant was not added in the preparation of the flame retardant composite cable material, and the other steps were exactly the same as in example 1.
Comparative example 2
The difference from example 1 is that: the flame retardant is only added with zinc borate when preparing the flame retardant composite cable material, and other steps are exactly the same as those of the embodiment 1.
Comparative example 3
The difference from example 1 is that: when preparing the flame-retardant composite cable material, only aluminum hydroxide is added into the flame retardant, and other steps are exactly the same as those of the example 1.
Comparative example 4
The difference from example 1 is that: the filler used in preparing the flame-retardant composite cable material was silica having a fineness of 10 μm, and the other steps were exactly the same as in example 1.
Comparative example 5
The difference from example 1 is that: the filler only adopts nano tungsten trioxide when preparing the flame-retardant composite cable material, and other steps are completely the same as those of the embodiment 1.
Comparative example 6
The difference from example 1 is that: in the preparation of the flame-retardant composite cable material, in step S2, the flame-retardant additive and the filler are added after being uniformly stirred, and the mixing uniformity is not calculated by collecting the mixed image, so that the full mixing is not ensured, and other steps are exactly the same as in example 1.
The properties of the composite cable materials obtained according to the above-described preparation steps of examples 1 to 4 and comparative examples 1 to 6 were tested, and the test results are shown in table 1.
High temperature resistance: tested according to GB/T2951.11-2008.
Thermal conductivity coefficient: tested according to GB/T10294-2008.
Flexural modulus: tested according to GB/T9341-2008.
Tensile properties: tensile strength and elongation at break were measured according to JIS K6251.
Oxygen index: tested according to GB/T2406-1993.
TABLE 1 Performance test under different conditions for preparing flame retardant composite Cable Material
As can be seen from examples 1-4 of Table 1, when the performance test result of the prepared flame-retardant composite cable material is best in the proportioning environment of example 4, comparative examples 1-3 show that the combination of the flame retardant zinc borate and aluminum hydroxide in the preparation of the novel flame-retardant composite cable material as the flame retardant remarkably improves the overall comprehensive service performance of the material, because the flame retardant zinc borate is melted at high temperature to form a glassy coating, and then dehydrated at high temperature, the evaporation heat of water and other effects of water vapor are beneficial to self-extinguishing combustion, and the dehydrated zinc borate can promote the generation of an inorganic carbon layer, is difficult to ignite and burn and has an isolation effect; the zinc borate can generate hard porous residues similar to glass and ceramic with the aluminum hydroxide as the flame retardant added by the invention, thereby being beneficial to heat insulation and preventing air from diffusing into the material.
One of the fillers is used in comparative example 4 and comparative example 5, and compared with example 1, the result is that the performance of the material is obviously better than that of a single filler after two fillers are added, and the nano tungsten trioxide improves the heat resistance and compactness of the composite material, so that the material has good flame retardant effect by using two fillers.
Comparative example 6 in step S2, flame retardant additives and fillers were added after stirring uniformly, but sufficient mixing was not ensured, and the flame retardant properties and mechanical properties of the prepared composite cable material were slightly inferior to those of example 1.
By compounding a plurality of materials, the composite modified material has excellent mechanical properties and can bear high-strength stretching and bending.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (8)
1. A flame retardant composite cable material, characterized by: comprises the following components in parts by weight:
wherein the flame retardant comprises zinc borate and aluminum hydroxide, and the weight percentage of the aluminum hydroxide in the flame retardant is 50-70%; the filler is silicon dioxide; the filler also comprises nano tungsten trioxide, wherein the weight percentage of the nano tungsten trioxide in the filler is 20% -30%.
2. The flame retardant composite cable material of claim 1, wherein: the fineness of the silicon dioxide is 5-60 mu m.
3. A method of preparing a flame retardant composite cable material as claimed in any one of claims 1 to 2, wherein: the method comprises the following steps:
s1, placing thermoplastic polyurethane and chloroprene rubber in a specified weight part into a double-roll open mill for blending, firstly placing the thermoplastic polyurethane into the open mill for melt vulcanization, then gradually adding the chloroprene rubber, and cutting and mixing uniformly for a plurality of times;
s2, adding the mixture prepared in the step S1, silicone resin and aluminum cement in the specified weight parts into a mixing kettle, uniformly stirring, adding a flame retardant and a filler, and ensuring full mixing;
s3, pouring out the mixture which is uniformly mixed in the mixing kettle, and carrying out preliminary curing and molding;
s4, placing the material subjected to preliminary curing molding into a double-screw extruder for high-temperature extrusion to form granular materials;
and S5, conveying the extruded material into cooling forming equipment for cooling forming to obtain the flame-retardant composite cable material.
4. A method of preparing a flame retardant composite cable material as claimed in claim 3, wherein: in step S1, the temperature required for the melt vulcanization is 80 ℃, and the time required for the melt vulcanization is 10min.
5. A method of preparing a flame retardant composite cable material as claimed in claim 3, wherein: in step S4, the temperature of the high-temperature extrusion is 250 ℃.
6. A method of preparing a flame retardant composite cable material as claimed in claim 3, wherein: in step S5, the cooling molding temperature is 50 ℃.
7. A method of preparing a flame retardant composite cable material as claimed in claim 3, wherein: in step S2, the specific steps of adding the flame retardant and the filler after uniformly stirring and ensuring sufficient mixing are as follows:
s201: adding a flame retardant and a filler into a mixing kettle, mixing and stirring, standing for 2 minutes after stirring for 10 minutes, performing image acquisition on the mixture after mixing and stirring by using an image acquisition device, introducing the acquired image into image analysis software to divide pixels, extracting chromaticity of each pixel, and extracting chromaticity sequence (x) 1 ,x 2 ,x 3 ,....,x n ) Wherein x is i The chromaticity value of the ith pixel point is n, the number of the pixel points is n, and the average value of the chromaticity of the pixel points is obtained
S202, calculating a variance value of chromaticity of the mixed pixel pointsSubstituting variance value and average value into the formula of uniform value calculation +.>Obtain a uniform value, wherein a 1 As average duty ratio coefficient, a 2 For the variance value duty cycle, 1=a 1 +a 2 ，x max Maximum value of safety value, x, which is the average value of chromaticity min Minimum value, k, of the safety value, which is the average of the chromaticity max Is the maximum value, k, of the safety value of the variance value of the chromaticity min The minimum value of the safety value which is the variance value of the chromaticity;
s203, comparing the calculated uniformity value with a set uniformity threshold, if the uniformity value is larger than the set uniformity threshold, continuing stirring, standing for 2 minutes after stirring for 10 minutes, continuing testing, and if the uniformity value is smaller than the set uniformity threshold, fully mixing.
8. Use of a flame retardant composite cable material as defined in any one of claims 1-2 in the production of a flame retardant composite cable material.
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