CN115477796B - Flame-retardant silane crosslinking material with temperature resistance grade of 150 ℃ and preparation method thereof - Google Patents
Flame-retardant silane crosslinking material with temperature resistance grade of 150 ℃ and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the field of wire and cable materials, and provides a flame-retardant silane crosslinking material with a temperature resistance grade of 150 ℃ and a preparation method thereof, aiming at the problem of poor high-temperature aging resistance performance of the wire and cable materials, wherein the raw materials comprise components A and B; and (3) a component A: 40-60 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 5-10 parts of polyolefin elastomer, 5-20 parts of flame retardant, 1-5 parts of antioxidant, 0.5-1.5 parts of UV-resistant master batch, 1-3 parts of silane coupling agent and 0.1-1 part of grafting initiator; and the component B comprises the following components: 70-80 parts of linear low-density polyethylene, 0-5 parts of rheological master batch, 0.5-1.5 parts of silane crosslinking catalyst, 5-10 parts of antioxidant and 5-15 parts of UV-resistant master batch. The silane crosslinked polyethylene forms a three-dimensional network crosslinked structure, and has better thermo-mechanical property than common thermoplastic materials, high heat-resistant grade and aging resistance.
Description
Technical Field
The invention relates to the technical field of wire and cable materials, in particular to a flame-retardant silane crosslinking material with a temperature resistance grade of 150 ℃ and a preparation method thereof.
Background
Insulation of electrical equipment increases in insulation temperature during operation due to excessive ambient temperature or due to heating of the electrical equipment itself. Under the action of high temperature, the mechanical strength of insulation is reduced, the structure is deformed, the elasticity of the material is lost due to oxidization and polymerization, or the insulation breakdown is caused due to material cracking, and the voltage is reduced. The strength of the heat resistance of the insulating material directly or indirectly influences the service life of the cable.
Patent CN109306113A discloses an irradiation crosslinking low-smoke halogen-free flame-retardant polyolefin cable material for automobile wires, which comprises the following components in parts by mass: 25-60 parts of ethylene-vinyl acetate copolymer, 5-20 parts of compatilizer, 20-70 parts of polyethylene, 100-160 parts of halogen-free flame retardant, 5-30 parts of barium sulfate, 2-8 parts of modified nano silicon dioxide, 1.0-1.6 parts of coupling agent, 1.5-3 parts of crosslinking sensitizer, 1.4-2.4 parts of antioxidant, 0.5-2.0 parts of zinc sulfide and 2-5 parts of silicone master batch. According to the invention, zinc sulfide is used for replacing the copper inhibitor, so that the risk of precipitation and frosting of the copper inhibitor is avoided, and meanwhile, the copper ion catalytic aging is inhibited, and the copper-carrying high-temperature aging resistance is achieved. However, the polyolefin cable material only improves the high-temperature aging performance of short-term copper with the aging time of 240 hours, and the problem of poor aging performance of long-term copper with the high temperature is not solved. There is a need for an ideal solution.
Disclosure of Invention
In order to solve the problem of poor high-temperature aging resistance of the wire and cable material, the invention provides the flame-retardant silane crosslinking material with the temperature resistance grade of 150 ℃, and the insulating material can resist high-temperature aging at 150 ℃ for a long time and has better processability by crosslinking polyethylene and silane and adding an antioxidant and an anti-UV master batch.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a flame-retardant silane crosslinking material with a temperature resistance grade of 150 ℃ comprises a component A and a component B; the component A comprises the following raw materials in parts by weight: 40-60 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 5-10 parts of polyolefin elastomer, 5-20 parts of flame retardant, 1-5 parts of antioxidant, 0.5-1.5 parts of UV-resistant master batch, 1-3 parts of silane coupling agent and 0.1-1 part of grafting initiator; the component materials of the component B are as follows in parts by mass: 70-80 parts of linear low-density polyethylene, 0-5 parts of rheological master batch, 0.5-1.5 parts of silane crosslinking catalyst, 5-10 parts of antioxidant and 5-15 parts of UV resistant master batch.
The silane crosslinked polyethylene forms a three-dimensional reticular crosslinked structure, has better thermo-mechanical property than common thermoplastic materials, high heat-resistant grade and aging resistance, and has the advantages of excellent processing property, simple equipment, low production cost and the like. The invention further adds an antioxidant and an anti-UV master batch to further improve the high-temperature aging resistance of the material. According to the invention, the flame retardant is added into the raw materials to endow the silane crosslinked material with flame retardant property, the three-dimensional network crosslinked structure of the silane crosslinked material can also improve the dispersibility of the flame retardant, so that the flame retardant is beneficial to generating a char formation effect when the silane crosslinked material is combusted, and the flame retardant property is improved.
Preferably, the mass ratio of the component A to the component B is (90-94): 6-10. As a further preference, the mass ratio of the A component to the B component is 92:8.
Preferably, the flame retardant is a mixture of decabromodiphenyl ethane and antimony trioxide. Decabromodiphenyl ethane belongs to a brominated flame retardant, and mainly reacts in a gas phase to release low-energy bromine free radicals, and the low-energy free radicals replace high-energy free radicals (hydrogen free radicals and hydroxyl free radicals), so that the free radical chain reaction forming flame is inhibited, and the combustion process is slowed down. Antimony trioxide does not have flame retardance, but antimony oxyhalide SbOCl can be formed when added into a brominated flame retardant, so that a synergistic effect appears, the decomposition of the brominated flame retardant into active molecules is promoted, and the flame retardant effect of the brominated flame retardant is enhanced.
Preferably, the flame retardant is subjected to the following coating treatment: dissolving vinyl pyrrolidone in sodium sulfate water solution, heating to 60-80 ℃, adding eugenol and azodiisobutyl cyanide, adding decabromodiphenyl ethane-antimonous oxide mixture, tween-80 and 1, 4-dioxane, reacting for 3-7h, filtering, washing and drying to obtain the coated flame retardant.
As a further preference, the mass ratio of the vinylpyrrolidone, divinylbenzene, decabromodiphenylethane to antimony trioxide mixture is 10 (0.5-2): 80-160.
The flame retardant decabromodiphenyl ethane and the antimonous oxide are matched with each other to improve the flame retardant performance, but are both solid, and have poor dispersibility in polyethylene, so that the synergistic effect of the decabromodiphenyl ethane and the antimonous oxide is affected. In order to improve the dispersibility of the flame retardant, it is subjected to a coating treatment. And copolymerizing a vinyl pyrrolidone monomer and eugenol, and forming a coating layer on the surface of the flame retardant through in-situ polymerization, so that the dispersibility and the fluidity of the flame retardant in the polyethylene red are improved. The chemical name of eugenol is 4-allyl-2-methoxyphenol, benzene ring and phenolic hydroxyl are introduced into the coating layer, the benzene ring improves the molecular weight and the thermal stability of the coating layer, and the quality of the carbon layer is improved, so that the flame retardant effect is improved; however, too much benzene ring can cause the flame retardant to be smoke-big, so the dosage of eugenol needs to be reasonably controlled; the phenolic hydroxyl groups and carbonyl groups of the vinyl pyrrolidone form hydrogen bonds, so that the coating polymer has a three-dimensional cross-linked structure, release of the flame retardant is facilitated, and the mechanical properties of the silane cross-linked material are improved.
Preferably, the antioxidant is a compound mixture of tetra [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] neopentyl alcohol ester, tri (2, 4-di-tert-butylphenyl) phosphite ester and 4,4' -bis (alpha, alpha-dimethylbenzyl) diphenylamine.
Preferably, the anti-UV master batch is UV-531.
Preferably, the silane coupling agent is one or more of vinyl trimethoxy silane, vinyl triethoxy silane and vinyl tri (2-methoxyethoxy) silane.
Preferably, the grafting initiator is dicumyl peroxide.
Preferably, the silane crosslinking catalyst is dibutyl tin dilaurate, and/or benzenesulfonic acid. As a further preferred, the silane crosslinking catalyst is dibutyltin dilaurate.
The invention also provides a preparation method of the flame-retardant silane crosslinking material with the temperature resistance grade of 150 ℃, which comprises the following steps:
(1) Weighing the raw materials of the component A according to a proportion, uniformly mixing, adding into a double-screw extruder for extrusion granulation, drawing out a material strip, cooling through a water tank, granulating, drying and packaging to obtain the component A;
(2) Weighing the raw materials of the component B according to a proportion, uniformly mixing, adding into a double-screw extruder for extrusion granulation, drawing out a material strip, cooling through a water tank, granulating, drying and packaging to obtain the component B;
(3) And mixing the component A and the component B according to the mass ratio, extruding and molding, and then crosslinking to obtain the flame-retardant silane crosslinking material with the temperature resistance grade of 150 ℃.
Preferably, the crosslinking in step (3) is carried out in water or steam at a temperature of from 90 to 100 ℃.
Therefore, the invention has the following beneficial effects: (1) The insulating material can resist long-term aging at 150 ℃ by crosslinking polyethylene and silane and adding an antioxidant and an anti-UV master batch, and has good processability; (2) The vinyl pyrrolidone monomer and the eugenol are copolymerized, a coating layer is formed on the surface of the flame retardant through in-situ polymerization, the dispersibility and the fluidity of the flame retardant in the polyethylene red are improved, the benzene ring and the phenolic hydroxyl are introduced into the coating layer, the benzene ring improves the molecular weight and the thermal stability of the coating layer, and the quality of a carbon layer is improved, so that the flame retardant effect is improved; the phenolic hydroxyl groups and carbonyl groups of the vinyl pyrrolidone form hydrogen bonds, so that the coating polymer has a three-dimensional cross-linked structure, and the release of the flame retardant is facilitated.
Detailed Description
The technical scheme of the invention is further described through specific embodiments.
In the present invention, unless otherwise specified, the materials and equipment used are commercially available or are commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
General examples
A flame-retardant silane crosslinking material with a temperature resistant grade of 150 ℃ comprises a component A and a component B in a mass ratio of (90-94) (6-10); the component A comprises the following raw materials in parts by weight: 40-60 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 5-10 parts of polyolefin elastomer, 5-20 parts of flame retardant, 1-5 parts of antioxidant, 0.5-1.5 parts of UV-resistant master batch, 1-3 parts of silane coupling agent and 0.1-1 part of grafting initiator; the component materials of the component B are as follows in parts by mass: 70-80 parts of linear low-density polyethylene, 0-5 parts of rheological master batch, 0.5-1.5 parts of silane crosslinking catalyst, 5-10 parts of antioxidant and 5-15 parts of UV resistant master batch.
The flame retardant is a mixture of decabromodiphenyl ethane and antimony trioxide.
The antioxidant is a compound mixture of tetra [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] quaternary amyl alcohol ester, tri (2, 4-di-tert-butylphenyl) phosphite ester and 4,4' -bis (alpha, alpha-dimethylbenzyl) diphenylamine.
The anti-UV master batch is UV-531.
The silane coupling agent is one or more of vinyl trimethoxy silane, vinyl triethoxy silane and vinyl tri (2-methoxyethoxy) silane.
The grafting initiator is dicumyl peroxide.
The silane crosslinking catalyst is dibutyl tin dilaurate and/or benzenesulfonic acid.
The preparation method of the flame-retardant silane crosslinking material with the temperature resistance grade of 150 ℃ comprises the following steps:
(1) Weighing the raw materials of the component A according to a proportion, uniformly mixing, adding into a double-screw extruder for extrusion granulation, drawing out a material strip, cooling through a water tank, granulating, drying and packaging to obtain the component A;
(2) Weighing the raw materials of the component B according to a proportion, uniformly mixing, adding into a double-screw extruder for extrusion granulation, drawing out a material strip, cooling through a water tank, granulating, drying and packaging to obtain the component B;
(3) Mixing the component A and the component B according to the mass ratio, extruding and molding, and then crosslinking in water or water vapor at the temperature of 90-100 ℃ to obtain the flame-retardant silane crosslinking material with the temperature resistance grade of 150 ℃.
The temperature of each stage is set as follows: 120-140 ℃ of the feeding section, 150-190 ℃ of the compression section, 205-225 ℃ of the plasticizing section, 170-180 ℃ of the flange, 170-180 ℃ of the neck, 210-230 ℃ of the nose and 230-240 ℃ of the eye mould.
Example 1
A flame-retardant silane crosslinking material with a temperature resistance grade of 150 ℃ consists of a component A and a component B in a mass ratio of 92:8; the component A comprises the following raw materials in parts by weight: 51 parts of high-density polyethylene, 25 parts of linear low-density polyethylene, 8 parts of polyolefin elastomer, 10 parts of flame retardant, 3.15 parts of antioxidant, 1 part of UV-resistant master batch, 1.6 parts of silane coupling agent and 0.25 part of grafting initiator; the component materials of the component B are as follows in parts by mass: 76 parts of linear low-density polyethylene, 4 parts of rheological master batch, 1 part of silane crosslinking catalyst, 8 parts of antioxidant and 11 parts of UV-resistant master batch.
The flame retardant is a mixture of decabromodiphenyl ethane and antimony trioxide according to a weight ratio of 2:1; the antioxidant is a mixture of tetra [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] quaternary amyl alcohol ester, tri (2, 4-di-tert-butylphenyl) phosphite ester and 4,4' -bis (alpha, alpha-dimethylbenzyl) diphenylamine according to a weight ratio of 1:1.5:1.5; the anti-UV master batch is UV-531; the silane coupling agent is vinyl trimethoxy silane; the grafting initiator is dicumyl peroxide; the silane crosslinking catalyst is dibutyl tin dilaurate.
The preparation method of the flame-retardant silane crosslinking material with the temperature resistance grade of 150 ℃ comprises the following steps:
(1) Weighing the raw materials of the component A according to a proportion, uniformly mixing, adding into a double-screw extruder for extrusion granulation, drawing out a material strip, cooling through a water tank, granulating, drying and packaging to obtain the component A;
(2) Weighing the raw materials of the component B according to a proportion, uniformly mixing, adding into a double-screw extruder for extrusion granulation, drawing out a material strip, cooling through a water tank, granulating, drying and packaging to obtain the component B;
(3) And mixing the component A and the component B according to the mass ratio, extruding and molding, and then crosslinking in water at 90 ℃ to obtain the flame-retardant silane crosslinking material with the temperature resistance grade of 150 ℃.
Example 2
A flame-retardant silane crosslinking material with a temperature resistance grade of 150 ℃ consists of a component A and a component B in a mass ratio of 92:8; the component A comprises the following raw materials in parts by weight: 51 parts of high-density polyethylene, 25 parts of linear low-density polyethylene, 8 parts of polyolefin elastomer, 10 parts of flame retardant, 3.66 parts of antioxidant, 0.5 part of UV-resistant master batch, 1.6 parts of silane coupling agent and 0.25 part of grafting initiator; the component materials of the component B are as follows in parts by mass: 76 parts of linear low-density polyethylene, 4 parts of rheological master batch, 1 part of silane crosslinking catalyst, 7 parts of antioxidant and 12 parts of UV-resistant master batch.
The flame retardant is a mixture of decabromodiphenyl ethane and antimony trioxide according to a weight ratio of 2:1; the antioxidant is a mixture of tetra [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] quaternary amyl alcohol ester, tri (2, 4-di-tert-butylphenyl) phosphite ester and 4,4' -bis (alpha, alpha-dimethylbenzyl) diphenylamine according to a weight ratio of 1:1.5:1.5; the anti-UV master batch is UV-531; the silane coupling agent is vinyl trimethoxy silane; the grafting initiator is dicumyl peroxide; the silane crosslinking catalyst is dibutyl tin dilaurate.
The preparation method is the same as in example 1.
Example 3
The difference from example 1 is that the mass ratio of the A component to the B component is 90:10.
Example 4
The difference from example 1 is that the flame retardant is subjected to the following coating treatment: 10g of vinyl pyrrolidone is dissolved in 20mL of sodium sulfate aqueous solution, the temperature is raised to 70 ℃, 1g of eugenol and 0.1g of azobisisobutyronitrile are added, 120g of decabromodiphenylethane-antimonous oxide mixture (weight ratio of 2:1), 0.2g of Tween-80 and 100mL of 1, 4-dioxane are added, the mixture is stirred and reacted for 5h, and the mixture is filtered, washed with water and dried for 12h at 50 ℃ to obtain the coated flame retardant.
Example 5
The difference from example 4 is that the flame retardant is subjected to the following coating treatment: 10g of vinyl pyrrolidone is dissolved in 20mL of sodium sulfate aqueous solution, the temperature is raised to 70 ℃, 0.1g of azobisisobutyronitrile is added, 120g of decabromodiphenyl ethane-antimonous oxide mixture (weight ratio of 2:1), 0.2g of Tween-80 and 100mL of 1, 4-dioxane are added, the mixture is stirred and reacted for 5h, and the mixture is filtered, washed with water and dried at 50 ℃ for 12h to obtain the coated flame retardant.
Example 6
The difference from example 1 is that the flame retardant is subjected to the following coating treatment: 10g of vinyl pyrrolidone is dissolved in 20mL of sodium sulfate aqueous solution, the temperature is raised to 70 ℃, 1g of divinylbenzene and 0.1g of azobisisobutyronitrile are added, then 120g of decabromodiphenylethane-antimonous oxide mixture (weight ratio of 2:1), 0.2g of Tween-80 and 100mL of 1, 4-dioxane are added, the mixture is stirred and reacted for 5h, and the mixture is filtered, washed with water and dried at 50 ℃ for 12h to obtain the coated flame retardant.
Comparative example 1
The difference from example 1 is that no antioxidant is used.
The preparation method is the same as in example 1.
Comparative example 2
The difference from example 1 is that the antioxidant is tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] quat-amyl alcohol.
Comparative example 3
A flame-retardant silane crosslinking material with a temperature resistance grade of 150 ℃ consists of a component A and a component B in a mass ratio of 92:8; the component A comprises the following raw materials in parts by weight: 28 parts of high-density polyethylene, 28 parts of linear low-density polyethylene, 28 parts of polyolefin elastomer, 10 parts of flame retardant, 3.15 parts of antioxidant, 1 part of UV-resistant master batch, 1.6 parts of silane coupling agent and 0.25 part of grafting initiator; the component materials of the component B are as follows in parts by mass: 76 parts of linear low-density polyethylene, 4 parts of rheological master batch, 1 part of silane crosslinking catalyst, 8 parts of antioxidant and 11 parts of UV-resistant master batch.
The flame retardant is a mixture of decabromodiphenyl ethane and antimony trioxide according to a weight ratio of 2:1; the antioxidant is a mixture of tetra [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] quaternary amyl alcohol ester, tri (2, 4-di-tert-butylphenyl) phosphite ester and 4,4' -bis (alpha, alpha-dimethylbenzyl) diphenylamine according to a weight ratio of 1:1.5:1.5; the anti-UV master batch is UV-531; the silane coupling agent is vinyl trimethoxy silane; the grafting initiator is dicumyl peroxide; the silane crosslinking catalyst is dibutyl tin dilaurate.
The preparation method is the same as in example 1.
Comparative example 4
A flame-retardant silane crosslinking material with a temperature resistance grade of 150 ℃ consists of a component A and a component B in a mass ratio of 92:8; the component A comprises the following raw materials in parts by weight: 56 parts of high-density polyethylene, 28 parts of linear low-density polyethylene, 10 parts of flame retardant, 3.15 parts of antioxidant, 1 part of anti-UV master batch, 1.6 parts of silane coupling agent and 0.25 part of grafting initiator; the component materials of the component B are as follows in parts by mass: 76 parts of linear low-density polyethylene, 4 parts of rheological master batch, 1 part of silane crosslinking catalyst, 8 parts of antioxidant and 11 parts of UV-resistant master batch.
The flame retardant is a mixture of decabromodiphenyl ethane and antimony trioxide according to a weight ratio of 2:1; the antioxidant is a mixture of tetra [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] quaternary amyl alcohol ester, tri (2, 4-di-tert-butylphenyl) phosphite ester and 4,4' -bis (alpha, alpha-dimethylbenzyl) diphenylamine according to a weight ratio of 1:1.5:1.5; the anti-UV master batch is UV-531; the silane coupling agent is vinyl trimethoxy silane; the grafting initiator is dicumyl peroxide; the silane crosslinking catalyst is dibutyl tin dilaurate.
The preparation method is the same as in example 1.
Comparative example 5
A flame-retardant silane crosslinking material with a temperature resistance grade of 150 ℃ consists of a component A and a component B in a mass ratio of 92:8; the component A comprises the following raw materials in parts by weight: 56 parts of high-density polyethylene, 28 parts of polyolefin elastomer, 10 parts of flame retardant, 3.15 parts of antioxidant, 1 part of UV-resistant master batch, 1.6 parts of silane coupling agent and 0.25 part of grafting initiator; the component materials of the component B are as follows in parts by mass: 76 parts of linear low-density polyethylene, 4 parts of rheological master batch, 1 part of silane crosslinking catalyst, 8 parts of antioxidant and 11 parts of UV-resistant master batch.
The flame retardant is a mixture of decabromodiphenyl ethane and antimony trioxide according to a weight ratio of 2:1; the antioxidant is a mixture of tetra [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] quaternary amyl alcohol ester, tri (2, 4-di-tert-butylphenyl) phosphite ester and 4,4' -bis (alpha, alpha-dimethylbenzyl) diphenylamine according to a weight ratio of 1:1.5:1.5; the anti-UV master batch is UV-531; the silane coupling agent is vinyl trimethoxy silane; the grafting initiator is dicumyl peroxide; the silane crosslinking catalyst is dibutyl tin dilaurate.
The preparation method is the same as in example 1.
Comparative example 6
The difference from example 1 is that the mass ratio of the A component and the B component is 95:5.
Performance testing
The flame-retardant silane crosslinking materials prepared in each example and comparative example are tested for appearance, mechanical property, ageing resistance and flame retardance, and the testing method and technical requirements are as follows:
appearance: the size and color should be uniform, the size should not be larger than 3×4mm, and no obvious powder material should be present between the particles. All meet the requirements.
Mechanical properties: GB/T1040.3-2006 requires a tensile strength of not less than 13.5MPa and an elongation at break of not less than 350%.
Ageing resistance: GB/T2951.12-2008, under the conditions of mechanical property-air thermal aging (175 ℃ for 240 hours), the tensile strength is more than or equal to 10MPa, and the elongation at break is more than or equal to 100%; (2) long-term aging resistance-no cracks are visible after winding under the condition of air heat aging (150 ℃ and 3000 h).
Flame retardant properties: (1) after the flame retardant rating is subjected to the burning test for 10 seconds for the sample twice according to the requirement of UL94 test-V-0, the flame is extinguished within 30 seconds, and no burnt matters can fall down; (2) limiting oxygen index was tested according to GB/T2406.2-2009.
The specific results are shown in the following table.
Analysis of the above Table, examples 1-3 all met the requirements for the properties of the flame retardant silane cross-linking materials prepared according to the process of the present invention. Compared with the example 1, the antioxidant is not added in the comparative example 1, the antioxidant in the comparative example 2 is not compounded, and the 150 ℃ heat aging resistance of the product does not reach the standard, which indicates that the selection of the antioxidant plays a key role in the heat aging resistance; comparative examples 3 to 5 since the amount ratio of the high-density polyethylene, the linear low-density polyethylene and the polyolefin elastomer was not within the preferred range, the long-term aging resistance was not up to the standard, and the mechanical properties were also remarkably lowered. The mass ratio of the A, B component in comparative example 6 is out of the preferred range, the long-term aging resistance is not up to standard, and each property is also reduced because the mass ratio of the A, B component directly affects the structure of the silane crosslinking material.
Compared with the example 1, the example 4 carries out coating treatment on the flame retardant, the limiting oxygen index is obviously improved, and the mechanical property is slightly improved. Compared with example 4, in example 5, no eugenol is added when the flame retardant is coated, and in example 6, the eugenol is replaced by divinylbenzene when the flame retardant is coated, and the limiting oxygen index is lower than that of example 4, which shows that the benzene ring and the phenolic hydroxyl group of the eugenol can play a role in better flame retardant effect under the combined action.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalent changes and variations in the above-mentioned embodiments can be made by those skilled in the art without departing from the scope of the present invention.
Claims (7)
1. A flame-retardant silane crosslinking material with a temperature resistance grade of 150 ℃ is characterized by comprising a component A and a component B; the component A comprises the following raw materials in parts by weight: 40-60 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 5-10 parts of polyolefin elastomer, 5-20 parts of flame retardant, 1-5 parts of antioxidant, 0.5-1.5 parts of UV-resistant master batch, 1-3 parts of silane coupling agent and 0.1-1 part of grafting initiator; the component materials of the component B are as follows in parts by mass: 70-80 parts of linear low-density polyethylene, 0-5 parts of rheological master batch, 0.5-1.5 parts of silane crosslinking catalyst, 5-10 parts of antioxidant and 5-15 parts of UV-resistant master batch;
the flame retardant is a mixture of decabromodiphenyl ethane and antimony trioxide;
the flame retardant is subjected to the following coating treatment: dissolving vinyl pyrrolidone in sodium sulfate aqueous solution, heating to 60-80 ℃, adding eugenol and azodiisobutyl cyanide, adding decabromodiphenyl ethane-antimonous oxide mixture, tween-80 and 1, 4-dioxane, reacting 3-7h, filtering, washing and drying to obtain a coated flame retardant;
the mass ratio of the component A to the component B is (90-94) to (6-10).
2. A flame retardant silane cross linking material with a temperature resistant grade of 150 ℃ as claimed in claim 1, wherein the mass ratio of the mixture of vinyl pyrrolidone, divinylbenzene and decabromodiphenylethane-antimonous oxide is 10 (0.5-2): (80-160).
3. The flame retardant silane cross-linking material with a temperature resistance grade of 150 ℃ according to claim 1, wherein the antioxidant is a compound mixture of tetra [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] quaternary amyl alcohol ester, tri (2, 4-di-tert-butylphenyl) phosphite and 4,4' -bis (alpha, alpha-dimethylbenzyl) diphenylamine.
4. The flame retardant silane cross linking material with a temperature resistance grade of 150 ℃ as claimed in claim 1, wherein the silane coupling agent is one or more of vinyl trimethoxy silane, vinyl triethoxy silane and vinyl tri (2-methoxyethoxy) silane.
5. A flame retardant silane cross linking material of a temperature resistant grade of 150 ℃ according to claim 1 or 3 or 4, wherein the silane cross linking catalyst is dibutyl tin dilaurate and/or benzenesulfonic acid.
6. The method for preparing the flame-retardant silane crosslinking material with the temperature resistance grade of 150 ℃ as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps: (1) Weighing the raw materials of the component A according to a proportion, uniformly mixing, adding into a double-screw extruder for extrusion granulation, drawing out a material strip, cooling through a water tank, granulating, drying and packaging to obtain the component A;
(2) Weighing the raw materials of the component B according to a proportion, uniformly mixing, adding into a double-screw extruder for extrusion granulation, drawing out a material strip, cooling through a water tank, granulating, drying and packaging to obtain the component B;
(3) And mixing the component A and the component B according to the mass ratio, extruding and molding, and then crosslinking to obtain the flame-retardant silane crosslinking material with the temperature resistance grade of 150 ℃.
7. The method for preparing a flame retardant silane cross linking material with a temperature resistant grade of 150 ℃ as claimed in claim 6, wherein the cross linking in step (3) is carried out in water or steam at 90-100 ℃.
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