CN108192265B - Flame-retardant TPE arc isolation sheet and preparation method thereof - Google Patents

Flame-retardant TPE arc isolation sheet and preparation method thereof Download PDF

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CN108192265B
CN108192265B CN201711254814.8A CN201711254814A CN108192265B CN 108192265 B CN108192265 B CN 108192265B CN 201711254814 A CN201711254814 A CN 201711254814A CN 108192265 B CN108192265 B CN 108192265B
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arc
parts
flame
retardant
sebs
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CN108192265A (en
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王伟俊
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Ningbo Ouhao New Materials Co.,Ltd.
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Yuyao Youxin Plastic Co ltd
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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
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
    • C08L53/025—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes modified
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/04—Thermoplastic elastomer

Abstract

The invention discloses a flame-retardant TPE arc-isolating piece and a preparation method thereof, which replace the prior art that PVC material is adopted to prepare the arc-isolating piece, and compared with the arc-isolating piece prepared by PVC material, the flame-retardant TPE arc-isolating piece reduces the generation of toxic gas and the pollution of heavy metal, and the technical scheme has the key points that: the flame-retardant TPE arc-isolating sheet comprises the following components in parts by weight: 15-20 parts of SEBS, 15-20 parts of white oil, 15-20 parts of PP, 20-25 parts of PE, 0.2-0.5 part of hindered phenol antioxidant, 0.2-0.5 part of phosphite ester, 0.2-0.5 part of stearic acid, 22-28 parts of flame retardant, 0.2-0.6 part of silicate and 0.2-0.6 part of shell powder, and has good flame retardant property.

Description

Flame-retardant TPE arc isolation sheet and preparation method thereof
Technical Field
The invention relates to an arc isolating sheet, in particular to a flame-retardant TPE arc isolating sheet and a preparation method thereof.
Background
The low-voltage circuit breaker is a commonly used distribution electrical appliance, is widely applied to various power engineering, and plays a role in distribution and protection in a low-voltage distribution system. Its operating performance is crucial to the safety and stability of the power grid. When a fault occurs in the system, the circuit breaker quickly cuts off the fault part in the system or cuts off the power supply of the whole power supply so as to prevent the fault from being enlarged and avoid causing huge economic loss and casualties.
The inside of current low-voltage circuit breaker all can be equipped with arc control device, and arc control device is an explosion chamber of constituteing by the multi-disc arc-insulated piece, and when the circuit breaker dropout, move, the static contact separation can produce electric arc between two contacts, carries out the arc extinguishing through the striking piece in these arc explosion chambers.
Common arc separation sheets in the market are prepared from PVC (polyvinyl chloride), however, PVC is easy to decompose and generates a large amount of toxic gases such as hydrogen chloride and dioxin during combustion, and the generated hydrogen chloride gas can corrode metal parts in the circuit breaker, so that originally stable heavy metal components in the circuit breaker such as lead, cadmium and the like are activated, and further heavy metal pollution in living environment is caused. With the growing concern about environmental protection, it has become necessary to adopt new materials to replace PVC materials.
Due to the characteristics of excellent product performance, convenient processing technology and safety and no toxicity, more and more TPEs are applied to the industries of automobiles, household appliances, electric wires and cables and the like. However, most of the conventional TPEs are flammable due to their own base materials, and an arc often exists in the circuit breaker, and if the arc isolating sheet is made of the conventional TPE material, the arc isolating sheet will burn, and the effect of isolating the arc cannot be achieved, so that it is a technical problem that research on a flame-retardant TPE material suitable for making the arc isolating sheet is urgently needed to solve at present.
Disclosure of Invention
The first purpose of the invention is to provide a flame-retardant TPE arc-isolating piece, which has good flame-retardant performance and reduces the generation of toxic gases and heavy metal pollution when the flame-retardant TPE arc-isolating piece is combusted.
The technical purpose of the invention is realized by the following technical scheme:
the flame-retardant TPE arc-isolating sheet comprises the following components in parts by weight: 15-20 parts of SEBS, 15-20 parts of white oil, 15-20 parts of PP, 20-25 parts of PE, 0.2-0.5 part of hindered phenol antioxidant, 0.2-0.5 part of phosphite ester, 0.2-0.5 part of stearic acid, 22-28 parts of flame retardant, 0.2-0.6 part of silicate and 0.2-0.6 part of shell powder.
More preferably: the flame-retardant TPE arc-isolating sheet comprises the following components in parts by mass: SEBS17 parts, white oil 17 parts, PP17 parts, PE22 parts, hindered phenol antioxidant 0.3 part, phosphite ester 0.3 part, stearic acid 0.4 part, flame retardant 25 parts, silicate 0.5 part and shell powder 0.5 part.
By adopting the scheme, the PP is polymerized by propylene, the PE is polymerized by ethylene, the SEBS is a linear triblock copolymer which takes polystyrene as a tail end section and takes an ethylene-butylene copolymer obtained by hydrogenation of polybutadiene as a middle elastic block, and compared with PVC polymerized by vinyl chloride, the linear triblock copolymer reduces the content of chlorine in the arc isolating sheet, reduces the generation of toxic gas during the combustion of the arc isolating sheet, reduces the corrosion to heavy metals and reduces the pollution to heavy metals;
PP, PE and SEBS are blended according to a specific proportion, a polystyrene hard-plastic block (hereinafter referred to as PS block) of the SEBS and an ethylene/butylene elastomer block (hereinafter referred to as EB block) in the middle are thermodynamically incompatible with each other, so that a two-phase structure is generated, the PS block of the SEBS is a dispersion phase which is dispersed in a rubber phase formed by the EB block and forms a physical cross-linking network with the EB block, and the PP and the PE are similar to the structure of the PS block and can be well dispersed in the rubber phase, so that the distribution of the dispersion phase consisting of the PP, PE and PS blocks in the rubber phase is changed into a net structure from a long worm shape, the SEBS presents an elastomer characteristic at normal temperature and a flowing characteristic at high temperature, and the prepared arc isolating sheet material has the characteristics of PP, PE and SEBS and has better stability and heat resistance;
the white oil has good compatibility with the rubber phase in the SEBS, but does not dissolve and soften the dispersed phase in the SEBS, and the oil-filled SEBS product can continuously keep a stable network structure and increase the fluidity of the SEBS;
the hindered phenol antioxidant has the characteristics of low toxicity, low pollution and strong compatibility, can be well compatible with SEBS under the action of phosphite ester, and improves the anti-aging performance of the arc-isolating sheet;
stearic acid is used as a heat stabilizer of the arc-isolating sheet, the stability of the arc-isolating sheet can be improved, the heat stabilizer has good lubricity, the fluidity of SEBS (styrene-ethylene-butadiene-styrene) can be increased by cooperating with white oil, the adhesion capability of the arc-isolating sheet in the preparation process is reduced, and the loss of materials is reduced;
the combustion condition mainly comprises three parts of a comburent, oxygen and a burning point, wherein the arc isolating sheet is used as the comburent and can not be removed, the brominated flame retardant is used as an important variety of the organic flame retardant, the brominated flame retardant has low price and good stability, has good compatibility with SEBS, can keep the original physical and chemical properties of PP, PE and SEBS, and can quickly form a protective layer on the surface of the arc isolating sheet under the synergistic action of antimony trioxide when the arc isolating sheet contacts with a spark to prevent the oxygen from contacting with the arc isolating sheet so as to achieve the flame retardant effect;
in the rubber industry, carbon black is generally adopted as a reinforcing material, however, the production process of the carbon black is complex, the price is high, and research experiments show that silicate can also play a good reinforcing role, so that the hardness of the arc isolating sheet is increased; the shell powder has good compatibility with PP, PE and SEBS, and can simultaneously play a role in reinforcing with silicate, so that the using amount of the white carbon black can be reduced, and the production cost can be reduced.
More preferably: the white oil is No. 10 white oil.
By adopting the scheme, the most important one of the requirements of the oil-filled rubber on the quality index of the white oil is the content of aromatic hydrocarbon, the aromatic hydrocarbon has stronger dissolution effect on a dispersion phase in SEBS molecules and destroys a network structure of the SEBS, so that the stability of the arc isolating sheet is reduced, meanwhile, the lower the content of the aromatic hydrocarbon is, the slower the yellowing speed of a product is, and the higher the quality of the product is, wherein the content of the aromatic hydrocarbon in No. 10 white oil is lower, the kinematic viscosity of the white oil is smaller, and the stirring power in the production process of the arc isolating sheet is reduced.
More preferably: the hindered phenol antioxidant is one or a mixture of two of antioxidant 330 and antioxidant 1010.
By adopting the scheme, the antioxidants 330 and 1010 have more functional groups and high oxidation resistance efficiency, and the relative molecular mass is high, the volatility is small, so that the influence on the body health of operators caused by the volatilization of the antioxidants in the process of preparing the arc isolating sheet is reduced.
More preferably: the flame retardant is a mixture of a brominated flame retardant and antimony trioxide, and the mass ratio of the brominated flame retardant to the antimony trioxide is 1: 2.
by adopting the scheme, research and experiments show that the weight ratio of the brominated flame retardant to the antimony trioxide is in the proportion, the dripping phenomenon of the combustion of the arc-isolating sheet can be well inhibited, the smoke generation amount is reduced, and the flame retardant property of the arc-isolating sheet is improved.
More preferably: the brominated flame retardant is decabromodiphenylethane.
By adopting the scheme, the decabromodiphenylethane has good thermal stability, does not generate toxic polybrominated dibenzodioxane (PBDO) and polybrominated dibenzofuran (PBDF) during cracking or combustion, and further has the characteristics of low toxicity and cyclic utilization; in addition, the compatibility of the decabromodiphenylethane and the SEBS is better than that of other bromine flame retardants, and the tensile strength of the arc insulating sheet can be increased.
More preferably: the silicate is white carbon black.
By adopting the scheme, the white carbon black has good dispersibility, can be uniformly dispersed in the material of the arc isolating sheet and has good reinforcing effect on the arc isolating sheet; in addition, silicon hydroxyl on the surface of the white carbon black has stronger activity, can consume dissolved oxygen in the preparation process of the arc-isolating sheet, modifies the white carbon black to form a stable structure, and evaporates the white carbon black and water generated by the dissolved oxygen in the molten glue solution of SEBS, PP and PE so as to prevent the oxidation of the arc-isolating sheet in the processing process.
More preferably: the arc-isolating sheet also comprises 0.1-0.5 part of o-phenylphenol by mass.
By adopting the scheme, the o-phenylphenol has good sterilization and corrosion prevention effects, and research tests show that the o-phenylphenol can also effectively inhibit the damage of insects and ants to the arc isolating sheet, so that the service life of the arc isolating sheet is prolonged.
The second purpose of the invention is to provide a preparation method of the flame-retardant TPE arc-isolating sheet, which improves the plasticizing effect of the arc-isolating sheet.
The technical purpose of the invention is realized by the following technical scheme:
a preparation method of the flame-retardant TPE arc-isolating sheet comprises the following preparation steps:
s1: putting the SEBS into a mixer, setting the rotating speed to be 650-750r/min, heating to 100 ℃, and stirring until the SEBS is completely melted to obtain SEBS molten liquid;
s2: adding white oil into the SEBS molten liquid of S1, stirring for 5-10min at a speed of 100-120r/min, and standing until the white oil is completely absorbed to obtain SEBS oil-filled liquid;
s3: sequentially adding PP and PE into the SEBS oil filling liquid of S2, setting the rotating speed to be 650-750r/min, and stirring until the PP and the PE are completely melted to obtain a premix;
s4: sequentially adding hindered phenol antioxidant, phosphite ester, stearic acid, brominated flame retardant-antimony trioxide mixture, silicate, shell powder and other components into the premix of S3, and setting the rotating speed to be 1000-1200r/min for premixing for 5-10min to obtain a granulation precursor;
s5: adding the granulation precursor of S4 into a double-screw extruder for melt extrusion granulation to obtain TPE granules;
s6: and (4) adding the TPE granules in the S5 into an injection molding machine, and obtaining a finished product of the flame-retardant TPE arc-isolating sheet through injection molding.
By adopting the scheme, the SEBS is fully dissolved and then the white oil is added, so that the white oil can be fully absorbed by the SEBS, the fluidity of the SEBS is improved, PP and PE can be conveniently and rapidly mixed with the SEBS, and the compatibility among the PP, the PE and the SEBS is improved; and then sequentially adding a hindered phenol antioxidant, phosphite ester, stearic acid, a brominated flame retardant-antimony trioxide mixture, silicate and shell powder, and mixing at a high speed, so that the auxiliary agent can be uniformly dispersed in a molten glue solution formed by PP, PE and SEBS, the plasticizing effect of the arc isolating sheet material is improved, the mixing of all components can be further promoted through a double-screw extruder, a large amount of moisture and low-molecular volatile matters in the components are discharged, the discharged material is more fine and smooth, and the surface smoothness of the arc isolating sheet is improved.
In conclusion, the invention has the following beneficial effects:
the arc-isolating sheet keeps the original characteristics of each component by blending PP and PE with the SEBS after oil filling, and reduces the generation of toxic gas and heavy metal pollution during combustion; the flame-retardant arc-isolating sheet is prepared by adding hindered phenol antioxidant, phosphite ester, stearic acid, brominated flame retardant-antimony trioxide mixture, silicate, shell powder and other components into a premix of the flame-retardant arc-isolating sheet, so that the arc-isolating sheet has good oxidation resistance, flame retardance, hardness and thermal stability and can inhibit damage of insects and ants to the arc-isolating sheet.
Detailed Description
PP is selected as Yanshan petrochemical K7726H;
PE is selected as DGDK-3364NT brand of Dow;
SEBS is selected from American Keteng brand G-1651;
the white oil is selected from No. 10 white oil directly supplied by Jirun petrochemical industry in Changzhou, and has kinematic viscosity of 14mm at 40 deg.C2(s), the ultraviolet absorbance of the polycyclic aromatic hydrocarbon at the wavelength of 260-350 nm is less than 0.1;
the hindered phenol antioxidant is one or two of antioxidant 330 and antioxidant 1010, the antioxidant 330 in the invention is selected from the antioxidant directly sold in Zhengzhou Haichuan chemical industry, the gray level is less than 0.1%, and the volatility is less than 0.5%; antioxidant 1010 is selected from the antioxidant of the plastic direct-selling of the Chang Yi of Dongguan, and the gray level is less than 0.1 percent, and the volatility is less than 0.5 percent. Besides, the hindered phenol antioxidant can be antioxidant 3114, antioxidant 3125, antioxidant AC-400, etc.;
the phosphite ester is selected from 618(PEP-8T) type of Fushan Shengyi plastic chemical industry, and the content of effective substances is 99.99 percent;
stearic acid is selected from the S160 type of the chemical engineering of the holly billion plastic of the Buddha mountain, and the content of the effective component is 99.8 percent;
the flame retardant is preferably a mixture of a bromine flame retardant and antimony trioxide, and may be an IFR flame retardant, a phosphorus flame retardant, a nitrogen flame retardant, or the like; wherein, the bromine flame retardant can be decabromodiphenylethane, decabromodiphenyl ether, bromotriazine, brominated epoxy resin and the like, and the bromine flame retardant and antimony trioxide are selected from common models of Zibose flame retardant materials Co; the silicate can be white carbon black, talc, sericite, kaolin, etc., and the silicate is a new material of Shandonglihua;
the shell powder is selected from GR powder type of Liaoning Shengdao nanometer shell biotechnology;
the o-phenylphenol is selected from o-phenylphenol directly purchased from Shanghai Hai koji chemical industry;
the mixer is a high-speed mixer with a mechanical model HRS-100 of Dongguan cycloxin;
the double-screw extruder is selected from an SHJ20-135 model of Nanjing mechanical polymer chemical industry, the diameter of a screw is 95mm, and the length of the screw is 2340 mm;
the injection molding machine is selected from Haitian HTF450X1 model, the screw diameter is 40-80mm, and the injection amount is 210 g.
Example 1
S1: putting 15kg of SEBS into a mixer, setting the rotating speed to be 650r/min, heating to 100 ℃, and stirring until the SEBS is completely melted to obtain SEBS molten liquid;
s2: adding 15kg of No. 10 white oil into the SEBS molten liquid of S1, stirring for 5min at a speed of 100r/min, and standing until the No. 10 white oil is completely absorbed to obtain SEBS oil-filled liquid;
s3: sequentially adding 15kg of PP and 20kg of PE into the SEBS oil filling liquid of S2, setting the rotating speed to be 650r/min, and stirring until the PP and the PE are completely melted to obtain a premix;
s4: adding 0.2kg of antioxidant 330, 0.2kg of phosphite ester, 0.2kg of stearic acid, 22kg of a mixture of decabromodiphenylethane and antimony trioxide (the mass ratio of decabromodiphenylethane to antimony trioxide is 1: 2), 0.2kg of white carbon black and 0.2kg of shell powder into the premix of S3 in sequence, and setting the rotating speed to be 1000r/min for premixing for 5min to obtain a granulation precursor;
s5: adding the granulation precursor of S4 into a double-screw extruder for melt extrusion granulation to obtain TPE granules;
s6: and (4) adding the TPE granules in the S5 into an injection molding machine, and obtaining a finished product of the flame-retardant TPE arc-isolating sheet through injection molding.
Examples 2 to 18
Examples 2-18 all adjusted the composition of the arc-isolating sheet and the mass of each component in kg based on the method technique of example 1, the adjusted composition of the arc-isolating sheet and the mass of each component are as follows:
Figure BDA0001492423230000071
comparative example 1
Comparative example 1 is a PVC arc-insulating sheet sold directly by Yidelong industries, Inc. of Huizhou, marked as PVC-1;
comparative example 2
Comparative example 2 is a PVC arc-insulating sheet sold directly by Dongguan Enda rubber Co., Ltd, and is designated PVC-2.
The arc-blocking sheets obtained in the above 18 groups of examples, comparative example 1 and comparative example 2 were used as the subjects to be tested for arc-blocking
Sheet property test experiment:
1. appearance detection
10 arc-isolating sheet samples are respectively extracted from the arc-isolating sheets of each group of the examples, the comparative examples 1 and the comparative examples 2, and the observation is carried out by a visual inspection mode;
2. corrosiveness of metal
The detection standard is GB/T14834-2009;
3. temperature of thermal deformation
The detection standard is GB/T1634.1-2004;
4. adhesion Properties
Weighing 300g of arc isolating sheet samples from each group of arc isolating sheets of the embodiment, the comparative example 1 and the comparative example 2, placing the arc isolating sheet samples in a beaker for melting, and controlling the temperature of a molten liquid to be 200 ℃ to obtain molten liquid of the arc isolating sheet;
② weighing the glass rod with the weight m0；
Thirdly, vertically extending the glass rod into the beaker with the arc-isolating sheet melt liquid, enabling the liquid level depth of the glass rod extending into the arc-isolating sheet melt liquid to be 10cm, taking out the glass rod, weighing the glass rod and the weight sum of the arc-isolating sheet melt liquid adhered to the glass rod to be m1；
Fourthly, calculating m1-m0Obtaining the difference value which is the adhesion amount of the arc isolating sheet;
5. aging Property
The detection standard is GB 11206-1989;
6. combustibility
The detection standard is UL-94;
7. shore hardness (A)
The detection standard is GB/T531.1-2008;
8. degree of damage by insects and ants
Selecting 100 healthy ants with similar body types, and fasting for 48 hours;
weighing 1000mg of arc isolating sheet samples with no dust on the surfaces from the arc isolating sheets of each group of the embodiment, the comparative example 1 and the comparative example 2, and respectively placing the samples of each group into beakers;
respectively placing 10 fasting ants in the beaker, and standing for 72 hours;
fourthly, taking out the rest arc isolating pieces from the beaker, removing powder on the surface by using a brush, and weighing the mass to obtain m3；
Calculating 1000-m3And obtaining the difference value which is the damage degree of the insects and the ants.
The test results are given in the following table:
Figure BDA0001492423230000091
the test results were analyzed as follows:
1. comparing any one of the embodiments 1-18 with PVC-1 and PVC-2, the flame-retardant TPE arc isolating sheet obtained by the preparation method has the characteristics of smooth and flat surface, low metal corrosion, good thermal stability, small adhesion, good oxidation resistance, good flame retardance, high hardness and good insect and ant damage resistance compared with the PVC arc isolating sheet purchased in the market;
2. the results of the heat distortion temperature measurements of four examples in a single group were compared, using examples 1 to 4 as one group, examples 5 to 8 as one group, and examples 9 to 12 as one group, to find that: with the increase of the mass of stearic acid, the thermal stability of the flame-retardant TPE arc-isolating sheet tends to rise first and then fall, wherein when the mass of stearic acid is 0.4kg, the thermal stability of the flame-retardant TPE arc-isolating sheet is optimal;
4. the results of measuring the amounts of adhesion of the four examples in a single group were compared with each other, each of examples 1 to 4, examples 5 to 8, and examples 9 to 12, and it was found that: with the increase of the mass of the stearic acid, the adhesion performance of the flame-retardant TPE arc-isolating sheet tends to rise, and the mass of the stearic acid is preferably 0.4kg by combining the thermal stability of the flame-retardant TPE arc-isolating sheet;
5. the results of the crack width ratings were compared for examples 1-4, examples 5-8, and examples 9-12:
as can be seen from the comparison between the groups, the flame-retardant TPE arc-isolating sheet has better aging resistance when the antioxidant 330 and the antioxidant 1010 are used in combination than when the antioxidant 330 is used alone or the antioxidant 1010 is used alone;
as can be seen from comparison of four examples in a single group, the anti-aging performance of the flame-retardant TPE arc-isolating sheet tends to increase first and then decrease with the increase of the mass of the hindered phenol antioxidants, wherein when the mass ratio of the antioxidant 330 to the antioxidant 1010 is 3: 2, the anti-aging performance of the flame-retardant TPE arc-isolating sheet is optimal;
6. the results of the combustibility tests of the four examples in a single group were compared with each other by using examples 1 to 4 as one group, examples 5 to 8 as one group, and examples 9 to 12 as one group: when the mixture of the decabromodiphenylethane and the antimony trioxide is 25kg, the flame-retardant TPE arc-isolating sheet has the best flame-retardant effect;
7. comparing the flammability results of examples 11, 13, 14 and 15, it can be seen that the flame retardant performance of the flame retardant TPE arc-insulating sheet is better when a mixture of decabromodiphenylethane and antimony trioxide is used;
8. comparing the shore hardness test results of four examples in a single group, using examples 1 to 4 as one group, examples 5 to 8 as one group, and examples 9 to 12 as one group, it can be seen that: with the increase of the mass of the white carbon black, the hardness of the flame-retardant TPE arc isolating sheet tends to increase first and then decrease, wherein when the mass of the white carbon black is 0.5, the hardness of the flame-retardant TPE arc isolating sheet is optimal;
9. comparing the shore hardness results of examples 11, 16, 17 and 18, it can be seen that the flame retardant TPE arc barrier sheet has stronger hardness when white carbon black is used;
10. the results of the detection of the degree of damage by the termites were compared with examples 1 to 4 and examples 9 to 12:
as can be seen from the comparison between groups, the addition of the o-phenylphenol can effectively inhibit the flame-retardant TPE arc-isolating sheet from being damaged by the insects and the ants; it can be known from comparison of four examples in a single group that, along with the increase of the mass of the o-phenylphenol, the pest and ant damage resistance of the flame-retardant TPE arc isolating sheet tends to rise first and then to be stable, and when the mass of the o-phenylphenol is 0.2kg, the pest and ant damage resistance of the flame-retardant TPE arc isolating sheet tends to be stable, so that the preferred value of the o-phenylphenol is 0.2 kg.
Comparative examples 3 to 7
Comparative examples 3 to 7 the above flammability test experiments were also carried out on the arc-isolating sheets obtained by adjusting the weight ratio of decabromodiphenylethane to antimony trioxide in a decabromodiphenylethane-antimony trioxide mixture on the basis of the method of example 11, wherein the weight ratio of decabromodiphenylethane to antimony trioxide was adjusted to 3: 1. 2: 1. 1: 1. 1: 3. 1: 4.
the test results for example 11 and comparative examples 3-8 are given in the following table:
Figure BDA0001492423230000111
comparing the flammability results of example 11 and comparative examples 3-7 in the above table, it can be seen that as the weight ratio of decabromodiphenylethane to antimony trioxide decreases, the flame retardant performance of the flame retardant TPE arc-barrier sheet increases, when the weight ratio of decabromodiphenylethane to antimony trioxide is 1: 2, the flame retardant performance of the flame-retardant TPE arc-isolating piece reaches a stable range, so that the weight ratio of the flame-retardant TPE arc-isolating piece is preferably 1: 2.
the present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the present invention.

Claims (4)

1. The flame-retardant TPE arc-isolating sheet comprises the following components in parts by weight: SEBS15-20 parts, white oil 15-20 parts, PP15-20 parts, PE20-25 parts, hindered phenol antioxidant 0.2-0.5 part, phosphite 0.2-0.5 part, stearic acid 0.2-0.5 part, flame retardant 22-28 parts, silicate 0.2-0.6 part and shell powder 0.2-0.6 part;
the flame retardant is a mixture of a brominated flame retardant and antimony trioxide, and the mass ratio of the brominated flame retardant to the antimony trioxide is 1: 2, the brominated flame retardant is decabromodiphenylethane; the silicate is white carbon black; the white oil is No. 10 white oil; the hindered phenol antioxidant is one or a mixture of two of antioxidant 330 and antioxidant 1010.
2. The flame-retardant TPE arc-isolating sheet according to claim 1 comprises the following components in parts by weight: SEBS17 parts, white oil 17 parts, PP17 parts, PE22 parts, hindered phenol antioxidant 0.3 part, phosphite ester 0.3 part, stearic acid 0.4 part, flame retardant 25 parts, silicate 0.5 part and shell powder 0.5 part.
3. The flame-retardant TPE arc-isolating piece as claimed in claim 1, wherein: according to the mass portion, 0.1 to 0.5 portion of o-phenylphenol is also included.
4. The preparation method of the flame-retardant TPE arc-isolating sheet according to any one of claims 1 to 3 comprises the following preparation steps:
s1: putting the SEBS into a mixer, setting the rotating speed to be 650-750r/min, heating to 100 ℃, and stirring until the SEBS is completely melted to obtain SEBS molten liquid;
s2: adding white oil into the SEBS molten liquid of S1, stirring for 5-10min at a speed of 100-120r/min, and standing until the white oil is completely absorbed to obtain SEBS oil-filled liquid;
s3: sequentially adding PP and PE into the SEBS oil filling liquid of S2, setting the rotating speed to be 650-750r/min, and stirring until the PP and the PE are completely melted to obtain a premix;
s4: sequentially adding hindered phenol antioxidant, phosphite ester, stearic acid, brominated flame retardant-antimony trioxide mixture, silicate, shell powder and other components into the premix of S3, and setting the rotating speed to be 1000-1200r/min for premixing for 5-10min to obtain a granulation precursor;
s5: adding the granulation precursor of S4 into a double-screw extruder for melt extrusion granulation to obtain TPE granules;
s6: and (4) adding the TPE granules in the S5 into an injection molding machine, and obtaining a finished product of the flame-retardant TPE arc-isolating sheet through injection molding.
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