CN112409671B - Silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material, and preparation method and application thereof - Google Patents
Silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material, and preparation method and application thereof Download PDFInfo
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
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Abstract
The application discloses a silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material, a preparation method and application thereof, wherein the silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material comprises a material A and a material B, the absolute value of the difference of specific gravities of the material A is less than 0.05, the material A comprises a first base resin, a compatilizer, a first flame retardant, silane, an initiator and a first antioxidant, the material B comprises a second base resin, a second flame retardant, a second antioxidant and a catalyst, and the first base resin and the second base resin are independently composed of 30-70% of low-melting-finger high-density polyethylene and 30-70% of high-melting-finger high-density polyethylene; the compatilizer consists of maleic anhydride grafted ethylene butyl acrylate copolymer and maleic anhydride grafted polyethylene; it can be obtained by mixing A, B materials after preparing the materials respectively; and the application of the material in preparing the automobile cable, wherein the automobile raw material can be rapidly crosslinked under natural conditions, and still has smooth and fine appearance and excellent physical and mechanical properties on the premise of higher paying-off speed.
Description
Technical Field
The application belongs to the technical field of automobile raw materials, and particularly relates to a halogen-free low-smoke flame-retardant polyolefin material for an automobile raw material, in particular to a silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material, and a preparation method and application thereof.
Background
At present, along with the continuous improvement of requirements on environmental protection, safety and the like, the traditional halogen flame retardant material containing chlorine and bromine can not meet the requirements on environmental protection and safety in the flame retardant material industry of automobile wires and the like, and the halogen-free flame retardant material is popular with more and more consumers by virtue of the advantages of no halogen, low toxicity, high light transmittance during combustion, no corrosive gas emission and the like. At present, the thermosetting halogen-free flame retardant material is mainly manufactured by an irradiation crosslinking technology in the market, but the irradiation crosslinking has the defects of large equipment investment, long production period, disc replacement damage, difference in batch stability, regional limitation and the like, so that aiming at the problems, the silane crosslinking halogen-free flame retardant material is proposed in the prior art, but the following technical problems exist more or less in the improved technical scheme: 1. the paying-off speed and the physical and mechanical properties are difficult to be compatible; 2. the cost is high, and the large-scale production is not easy; 3. steam or a water bath is required to achieve good rapid crosslinking, etc.
Disclosure of Invention
The application aims to overcome one or more defects in the prior art and provide an improved silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material which can be rapidly crosslinked under natural conditions and still has excellent physical and mechanical properties on the premise of higher paying-off speed.
The application also provides a preparation method of the silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material.
The application also provides application of the silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material in preparation of an automobile cable.
In order to achieve the above purpose, the application adopts a technical scheme that:
a silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material comprises a material A and a material B, wherein the material A comprises a first base resin, a compatilizer, a first flame retardant, silane, an initiator and a first antioxidant, and the material B comprises a second base resin, a second flame retardant, a second antioxidant and a catalyst;
the first base resin and the second base resin are independently composed of low-melting-index high-density polyethylene and high-melting-index high-density polyethylene, wherein the melt index of the low-melting-index high-density polyethylene is 0.5-2.0g/10min, and the melt index of the high-melting-index high-density polyethylene is 8.0-30.0g/10min; wherein, in terms of mass percent, the first base resin or the second base resin comprises 30-70% of low-melting-point high-density polyethylene and 30-70% of high-melting-point high-density polyethylene;
the compatilizer consists of maleic anhydride grafted ethylene butyl acrylate copolymer and maleic anhydride grafted polyethylene, and the feeding mass ratio of the maleic anhydride grafted ethylene butyl acrylate copolymer to the maleic anhydride grafted polyethylene is 1:1.8-2.2;
the absolute value of the difference between the specific gravity of the material A and the specific gravity of the material B is less than 0.05.
According to some preferred aspects of the application, the absolute value of the difference between the specific gravity of the material a and the specific gravity of the material B is less than 0.03. Further preferably, the specific gravity of the material a is the same as the specific gravity of the material B.
According to the application, the specific gravity of the material A and the material B is 1.15-1.35.
According to some preferred and specific aspects of the application, the maleic anhydride grafted ethylene butyl acrylate copolymer has a grafting ratio of 1.0% to 1.4%.
According to some preferred and specific aspects of the application, the maleic anhydride grafted polyethylene has a grafting ratio of 0.6% to 0.8%.
According to some preferred and specific aspects of the present application, the melt index of the maleic anhydride grafted ethylene butyl acrylate copolymer is from 1.0 to 5.0g/10min.
According to some preferred and specific aspects of the application, the melt index of the maleic anhydride grafted polyethylene is from 0.8 to 3.0g/10min.
According to some preferred aspects of the application, the feeding mass ratio of the maleic anhydride grafted ethylene butyl acrylate copolymer to the maleic anhydride grafted polyethylene is 1:1.9-2.1.
According to some preferred aspects of the application, the first flame retardant and the second flame retardant are independently composed of Aluminum Diethylphosphinate (ADP), melamine Cyanurate (MCA) and a flame retardant synergist in a mass ratio of 5-20:5-20:1.
According to some specific aspects of the application, the flame retardant synergist is a combination of one or more selected from the group consisting of calcium carbonate, talc, hydrotalcite, silica, zinc borate, zinc oxide, montmorillonite, clay (silhouette Clay), clay, magnesia, alumina and glass frit.
According to some preferred aspects of the application, in the raw wire material of the automobile, the material A accounts for 93% -97% and the material B accounts for 3% -7% in percentage by mass.
According to some preferred aspects of the present application, the raw materials of the material a comprise, in mass percent, 20% -60% of a first base resin, 3% -18% of a compatilizer, 20% -70% of a first flame retardant, 1% -5% of silane, 0.1% -1.0% of an initiator, 0.1% -2% of a first antioxidant, and optionally 1% -3% of a first lubricant;
the material B comprises, by mass, 15% -80% of a second base resin, 15% -80% of a second flame retardant, 10% -30% of a second antioxidant, 0.3% -1.0% of a catalyst and optionally 1% -3% of a second lubricant.
According to some specific aspects of the application, the first lubricant, the second lubricant are independently selected from one or more of silicone rubber, EBS (N, N' -ethylenebisstearamide), oxidized polyethylene wax, stearic acid, magnesium stearate, calcium stearate, zinc stearate, erucamide, PPA (polyphthalamide), PETS (pentaerythritol stearate).
According to some preferred aspects of the application, the silane is vinyltrimethoxysilane.
According to some preferred aspects of the application, the initiator is dicumyl peroxide.
According to some preferred aspects of the present application, the first antioxidant is a combination of one or more selected from the group consisting of antioxidant 1010, antioxidant AO-80, antioxidant HP-10, and antioxidant 1024, and the second antioxidant is a combination of one or more selected from the group consisting of antioxidant 1010, antioxidant AO-80, antioxidant HP-10, antioxidant 1035, antioxidant 1024, other phosphite antioxidants, antioxidant 300, and antioxidant 412S.
According to some preferred aspects of the application, the catalyst is an organotin-based catalyst, including stannous octoate, dibutyltin dilaurate, and the like.
According to some specific aspects of the application, the material A or the material B can further comprise a water removing agent and the like.
The application provides another technical scheme that: the preparation method of the silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw wire comprises the following steps:
preparation of material A: mixing all raw materials except silane and initiator in the material A according to the formula proportion, extruding, adding the silane and the initiator in the extruding process, and finishing the silane grafting process by a double screw to prepare the material A;
and (3) preparation of a material B: mixing the raw materials in the weighed material B according to the formula proportion, extruding, and preparing the material B;
and mixing the prepared material A with the prepared material B to prepare the silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material.
According to some preferred and specific aspects of the application, in the preparation process of the material A or the material B, a high-torque double-screw double-stage extruder (phi 75) is adopted, the length-diameter ratio of the double screws is more than 64:1, 2 low-speed mixers are matched, 4 solid particle automatic metering scales, 5 powder automatic metering scales and 2 liquid scales are matched, and the liquid scales are connected with heating areas of the section 3 and the section 6. The double-stage double-screw equipment adopting the process of the high-torque low-speed long-distance (length-diameter ratio of 64:1) processing mode is used for producing the granules, so that the accurate control on the dispersion and the temperature is effectively improved with the high-torque low-speed and large length-diameter ratio, and the high efficiency and the uniformity of grafting are ensured.
According to some preferred and specific aspects of the application, during the preparation of the material A and the material B, the temperature of all temperature areas of the double-stage double-screw is set to be 80-190 ℃, the rotating speed of a host machine is 100-200rpm, and the yield is set to be 200-400kg/h.
According to some preferred and specific aspects of the application, in the preparation process of the material A, after granulation, aluminum plastic packaging, low-pressure vacuumizing and standard warehouse preservation are carried out.
The application has low VOC, and simultaneously, the silane, the initiator and byproducts thereof are strictly controlled and the production process is precisely controlled, thereby realizing low odor and meeting the VOC requirement.
The application provides another technical scheme that: the silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw wire material is applied to the preparation of automobile cables.
According to the application, the melt indices mentioned in the present application are all determined according to ASTM D1238 at 190℃under a test load of 2.16 kg.
Due to the application of the technical scheme, compared with the prior art, the application has the following advantages:
according to the application, the specific base resin, the compatilizer and the specific gravity difference value of the material A and the material B are selected, so that the problems of slower direction speed, poor surface quality of the automobile cable and poor physical and mechanical properties in the preparation process of the automobile cable in the prior art are solved, the paying-off speed can reach more than 400m/min, the surface quality is better, the quick crosslinking is realized under natural conditions, the high energy consumption problem caused by water bath or steam crosslinking is avoided, and meanwhile, the material A and the material B have excellent physical and mechanical properties, and the material A and the material B are more suitable for industrial expansion production compared with other similar products in the prior art.
Detailed Description
The above-described aspects are further described below in conjunction with specific embodiments; it should be understood that these embodiments are provided to illustrate the basic principles, main features and advantages of the present application, and that the present application is not limited by the scope of the following embodiments; the implementation conditions employed in the examples may be further adjusted according to specific requirements, and the implementation conditions not specified are generally those in routine experiments.
All starting materials are commercially available or prepared by methods conventional in the art, not specifically described in the examples below.
Example 1
The embodiment provides a silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material, which comprises a material A and a material B, wherein the material A and the material B are added in a mass ratio of 95:5;
the material A comprises 47.4 mass percent of first base resin, 3 mass percent of compatilizer, 50 mass percent of first flame retardant, 1.5 mass percent of silane, 0.1 mass percent of initiator, 0.5 mass percent of first antioxidant and 0.5 mass percent of first lubricant;
in the raw materials of the material B, 36% of a second base resin, 40% of a second flame retardant, 20% of a second antioxidant, 1% of a catalyst and 3% of a second lubricant;
the first base resin and the second base resin are respectively composed of low-melting-point high-density polyethylene (purchased from Daqing petrochemical industry, brand 5000S and melt index of 0.9g/10 min) and high-melting-point high-density polyethylene (purchased from Fushun petrochemical industry, brand 2911 and melt index of 20g/10 min) with the feeding mass ratio of 4:6;
the compatilizer consists of maleic anhydride grafted ethylene butyl acrylate copolymer (purchased from Shanghai lovely green Bi New Material technology Co., ltd., melt index of 3.0g/10min, BA content of 17%) and maleic anhydride grafted polyethylene (purchased from Ning wave energy photo New Material technology Co., ltd., brand MC216, melt index of 2.5g/10 min) with the mass ratio of 1:2;
the first flame retardant and the second flame retardant are respectively composed of diethyl aluminum phosphinate, melamine cyanurate and a flame retardant synergist, wherein the feeding mass ratio of the diethyl aluminum phosphinate to the melamine cyanurate to the flame retardant synergist is 8:8:1, and the flame retardant synergist is Clay and is purchased from Shanghai state scene chemical industry Co., ltd, and the mark is Clay20;
the silane is vinyl trimethoxy silane, and the initiator is dicumyl peroxide;
the first antioxidant is antioxidant 1010, and is purchased from basf and is available under the trademark Irganox 1010;
the second antioxidant is antioxidant 300, purchased from holy-Kappy, brand TBM-6;
the first lubricant is a silicone rubber master batch, and is purchased from Wake, and the brand L5-4;
the second lubricant is PETS, purchased from a base and sold under the trademark AHS;
the catalyst was dibutyltin dilaurate, available from Kai chemical technology Co., ltd., trade mark T12;
the specific gravity of the material A is 1.251g/cm 3 The specific gravity of the material B is 1.249g/cm 3 ；
The preparation method comprises the following steps:
preparation of material A: mixing the raw materials except the silane and the initiator in the material A according to the formula proportion, extruding, adding the silane and the initiator in the extruding process, finishing the silane grafting process by a double screw, packaging aluminum plastic after pelleting, vacuumizing at low pressure, and storing in a standard warehouse to prepare the material A; wherein, a high-torque double-screw double-step extruder (phi 75) is adopted, the length-diameter ratio of the double screws is 64:1, 2 low-speed mixers are matched, 4 solid particle automatic weighing scales, 5 powder automatic weighing scales and 2 liquid scales are adopted, and the liquid scales are connected with heating areas of section 3 and section 6; setting the temperature of all temperature areas of the double-stage double screws at 200 ℃, setting the rotation speed of a host machine at 220rpm, and setting the yield at 350kg/h;
and (3) preparation of a material B: mixing and extruding the raw materials in the weighed material B according to the formula proportion to prepare the material A; wherein, a high-torque double-screw double-step extruder (phi 75) is adopted, the length-diameter ratio of the double screws is 64:1, 2 low-speed mixers are matched, 4 solid particle automatic weighing scales, 5 powder automatic weighing scales and 2 liquid scales are adopted, and the liquid scales are connected with heating areas of section 3 and section 6; setting the temperature of all temperature areas of the double-stage double screws at 210 ℃, setting the rotation speed of a host machine at 220rpm, and setting the yield at 300kg/h;
and mixing the prepared material A and material B according to the mixing ratio, and crosslinking at room temperature to prepare the silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material.
Example 2
Substantially the same as in example 1, the only difference is that: the mass ratio of the low melt index high density polyethylene to the high melt index high density polyethylene is 4.5:5.5, and the specific gravity of the material A is 1.251g/cm 3 The specific gravity of the material B is 1.249g/cm 3 。
Example 3
Substantially the same as in example 1, the only difference is that: the mass ratio of the low melt index high density polyethylene to the high melt index high density polyethylene is 5:5, and the specific gravity of the material A is 1.250g/cm 3 The specific gravity of the material B is 1.249g/cm 3 。
Example 4
The embodiment provides a silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material, which comprises a material A and a material B, wherein the material A and the material B are added in a mass ratio of 95:5;
in terms of mass percent, the raw materials of the material A comprise 42% of a first base resin, 3.4% of a compatilizer, 55% of a first flame retardant, 1.5% of silane, 0.1% of an initiator, 0.5% of a first antioxidant and 0.5% of a first lubricant;
in the raw materials of the material B, 30% of a second base resin, 46% of a second flame retardant, 20% of a second antioxidant, 1% of a catalyst and 3% of a second lubricant;
the first base resin and the second base resin are respectively composed of low-melting-point high-density polyethylene (purchased from Daqing petrochemical industry, brand 5000S and melt index of 0.9g/10 min) and high-melting-point high-density polyethylene (purchased from Fushun petrochemical industry, brand 2911 and melt index of 20g/10 min) with the feeding mass ratio of 4:6;
the compatilizer consists of maleic anhydride grafted ethylene butyl acrylate copolymer (purchased from Shanghai lovely green Bi New Material technology Co., ltd., melt index of 3.0g/10min, BA content of 17%) and maleic anhydride grafted polyethylene (purchased from Ning wave energy photo New Material technology Co., ltd., brand MC216, melt index of 2.5g/10 min) with the mass ratio of 1:2;
the first flame retardant and the second flame retardant are respectively composed of diethyl aluminum phosphinate, melamine cyanurate and a flame retardant synergist, wherein the feeding mass ratio of the diethyl aluminum phosphinate to the melamine cyanurate to the flame retardant synergist is 8:8:1, and the flame retardant synergist is Clay and is purchased from Shanghai state scene chemical industry Co., ltd, and the mark is Clay20;
the silane is vinyl trimethoxy silane, and the initiator is dicumyl peroxide;
the first antioxidant is antioxidant 1010, and is purchased from basf and is available under the trademark Irganox 1010;
the second antioxidant is antioxidant 300, purchased from holy-Kappy, brand TBM-6;
the first lubricant is a silicone rubber master batch, and is purchased from Wake, and the brand L5-4;
the second lubricant is PETS, purchased from a base and sold under the trademark AHS;
the catalyst was dibutyltin dilaurate, available from Kai chemical technology Co., ltd., trade mark T12;
the specific gravity of the material A is 1.298g/cm 3 The specific gravity of the material B is 1.295g/cm 3 ；
The preparation method comprises the following steps:
preparation of material A: mixing the raw materials except the silane and the initiator in the material A according to the formula proportion, extruding, adding the silane and the initiator in the extruding process, finishing the silane grafting process by a double screw, packaging aluminum plastic after pelleting, vacuumizing at low pressure, and storing in a standard warehouse to prepare the material A; wherein, a high-torque double-screw double-step extruder (phi 75) is adopted, the length-diameter ratio of the double screws is 64:1, 2 low-speed mixers are matched, 4 solid particle automatic weighing scales, 5 powder automatic weighing scales and 2 liquid scales are adopted, and the liquid scales are connected with heating areas of section 3 and section 6; setting the temperature of all temperature areas of the double-stage double screws at 200 ℃, setting the rotation speed of a host machine at 200rpm, and setting the yield at 350kg/h;
and (3) preparation of a material B: mixing and extruding the raw materials in the weighed material B according to the formula proportion to prepare the material A; wherein, a high-torque double-screw double-step extruder (phi 75) is adopted, the length-diameter ratio of the double screws is 64:1, 2 low-speed mixers are matched, 4 solid particle automatic weighing scales, 5 powder automatic weighing scales and 2 liquid scales are adopted, and the liquid scales are connected with heating areas of section 3 and section 6; setting the temperature of all temperature areas of the double-stage double screws at 210 ℃, setting the rotation speed of a host machine at 200rpm, and setting the yield at 300kg/h;
and mixing the prepared material A and material B according to the mixing ratio, and crosslinking at room temperature to prepare the silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material.
Comparative example 1
Substantially the same as in example 1, the only difference is that; the mass ratio of the low melt-index high-density polyethylene to the high melt-index high-density polyethylene is 8:2, and the specific gravity of the material A is 1.253g/cm 3 The specific gravity of the material B is 1.250g/cm 3 。
Comparative example 2
Substantially the same as in example 1, the only difference is that: the compatibilizer is only maleic anhydride grafted ethylene butyl acrylate copolymer.
Comparative example 3
Substantially the same as in example 1, the only difference is that: the compatibilizer is only maleic anhydride grafted polyethylene.
Comparative example 4
Substantially the same as in example 1, the only difference is that: the specific gravity of the material A is 1.251g/cm 3 The specific gravity of the material B is 1.100g/cm 3 In the material B, the second base resin is 40 percent, the second flame retardant is 36 percent, and the rest dosage is unchanged; the difference between the specific gravity of the material A and the specific gravity of the material B was controlled to be 0.151. In the testing process of the material manufactured by the method, the range fluctuation of the overall performance is larger, the testing result deviation of each section is larger, and the most visual aspect is presented in the aspect of the thermal extension result.
Performance testing
The materials prepared in examples 1 to 4 and comparative examples 1 to 4 were subjected to the following performance tests (average of a plurality of times), and the respective properties were measured as shown in the following table 1.
TABLE 1
The above embodiments are provided to illustrate the technical concept and features of the present application and are intended to enable those skilled in the art to understand the content of the present application and implement the same, and are not intended to limit the scope of the present application. All equivalent changes or modifications made in accordance with the spirit of the present application should be construed to be included in the scope of the present application.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
Claims (8)
1. The raw materials of the material A comprise a first base resin, a compatilizer, a first flame retardant, silane, an initiator and a first antioxidant, and the raw materials of the material B comprise a second base resin, a second flame retardant, a second antioxidant and a catalyst, and are characterized in that: the first base resin and the second base resin are independently composed of low-melting-index high-density polyethylene and high-melting-index high-density polyethylene, wherein the melt index of the low-melting-index high-density polyethylene is 0.5-2.0g/10min, and the melt index of the high-melting-index high-density polyethylene is 8.0-30.0g/10min; wherein, in terms of mass percent, the first base resin or the second base resin comprises 30-70% of low-melting-point high-density polyethylene and 30-70% of high-melting-point high-density polyethylene;
the compatilizer consists of maleic anhydride grafted ethylene butyl acrylate copolymer and maleic anhydride grafted polyethylene, and the feeding mass ratio of the maleic anhydride grafted ethylene butyl acrylate copolymer to the maleic anhydride grafted polyethylene is 1:1.8-2.2; the grafting ratio of the maleic anhydride grafted ethylene butyl acrylate copolymer is 1.0-1.4%, the grafting ratio of the maleic anhydride grafted polyethylene is 0.6-0.8%, the melt index of the maleic anhydride grafted ethylene butyl acrylate copolymer is 1.0-5.0g/10min, and the melt index of the maleic anhydride grafted polyethylene is 0.8-3.0g/10min;
the absolute value of the difference between the specific gravity of the material A and the specific gravity of the material B is less than 0.05;
in the automobile raw wire material, 93-97% of material A and 3-7% of material B are calculated according to mass percent;
according to mass percentage, the raw materials of the material A comprise 20-60% of a first base resin, 3-18% of a compatilizer, 20-70% of a first flame retardant, 1-5% of silane, 0.1-1.0% of an initiator, 0.1-2% of a first antioxidant and 1-3% of a first lubricant optionally;
the material B comprises, by mass, 15% -80% of a second base resin, 15% -80% of a second flame retardant, 10% -30% of a second antioxidant, 0.3% -1.0% of a catalyst, and optionally 1% -3% of a second lubricant, wherein the sum of the contents of all components in the material B is 100%.
2. The silane self-crosslinking halogen-free low smoke flame retardant polyolefin automotive raw wire material according to claim 1, which is characterized in that: the absolute value of the difference between the specific gravity of the material A and the specific gravity of the material B is less than 0.03.
3. The silane self-crosslinking halogen-free low smoke flame retardant polyolefin automotive raw wire material according to claim 2, which is characterized in that: the specific gravity of the material A is the same as that of the material B.
4. The silane self-crosslinking halogen-free low smoke flame retardant polyolefin automotive raw wire material according to claim 1, which is characterized in that: the feeding mass ratio of the maleic anhydride grafted ethylene butyl acrylate copolymer to the maleic anhydride grafted polyethylene is 1:1.9-2.1.
5. The silane self-crosslinking halogen-free low smoke flame retardant polyolefin automotive raw wire material according to claim 1, which is characterized in that: the first flame retardant and the second flame retardant are independently composed of diethyl aluminum phosphinate, melamine cyanurate and a flame retardant synergist, wherein the feeding mass ratio of the diethyl aluminum phosphinate to the melamine cyanurate to the flame retardant synergist is 5-20:5-20:1, and the flame retardant synergist is one or a combination of a plurality of calcium carbonate, talcum powder, hydrotalcite, silicon dioxide, zinc borate, zinc oxide, montmorillonite, magnesium silicate clay, magnesia, alumina and glass powder.
6. The silane self-crosslinking halogen-free low smoke flame retardant polyolefin automotive raw wire material according to claim 1, which is characterized in that: the silane is vinyl trimethoxy silane, the initiator is dicumyl peroxide, the first antioxidant is one or more selected from the group consisting of antioxidant 1010, antioxidant AO-80, antioxidant HP-10 and antioxidant 1024, the second antioxidant is one or more selected from the group consisting of antioxidant 1010, antioxidant AO-80, antioxidant HP-10, antioxidant 1035, antioxidant 1024, antioxidant 300 and antioxidant 412S, and the catalyst is an organotin catalyst.
7. A method for preparing the silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automotive raw material according to any one of claims 1 to 6, which is characterized in that: the preparation method comprises the following steps:
preparation of material A: mixing all raw materials except silane and initiator in the material A according to the formula proportion, extruding, and adding the silane and the initiator in the extrusion process to prepare the material A;
and (3) preparation of a material B: mixing the raw materials in the weighed material B according to the formula proportion, extruding, and preparing the material B;
and mixing the prepared material A with the prepared material B to prepare the silane self-crosslinking halogen-free low-smoke flame-retardant polyolefin automobile raw material.
8. Use of a silane self-crosslinking halogen-free low smoke flame retardant polyolefin automotive raw material according to any one of claims 1-6 for the preparation of automotive cables.
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