CN101629007A - Low smoke non-halogen flame retardant thermoplastic elastomer composite material and preparation method thereof - Google Patents

Low smoke non-halogen flame retardant thermoplastic elastomer composite material and preparation method thereof Download PDF

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CN101629007A
CN101629007A CN200910042185A CN200910042185A CN101629007A CN 101629007 A CN101629007 A CN 101629007A CN 200910042185 A CN200910042185 A CN 200910042185A CN 200910042185 A CN200910042185 A CN 200910042185A CN 101629007 A CN101629007 A CN 101629007A
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sebs
composite material
magnesium hydroxide
thermoplastic elastomer
polypropylene
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CN101629007B (en
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赵建青
葛俊静
刘述梅
吴水珠
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Guangdong hi tech new material Limited by Share Ltd
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South China University of Technology SCUT
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Abstract

The invention discloses a low smoke non-halogen flame-retardant thermoplastic elastomer composite material and a preparation method thereof. The composite material comprises the following raw materials by weight percent: 20-35% of SEBS, 12-20% of paraffin oil, 10-20% of polypropylene, 30-46% of magnesium hydroxide, 3-8% of expansible graphite, 1.0-3.5% of flame-retardant synergist, 1.0-1.8% of lubricant and 0.2-0.4% of antioxidant. The preparation method comprises the following steps: mixing SEBS and paraffin oil, standing to ensure that SEBS is swelled; then placing the swelled SEBS and polypropylene in an open plasticator for mixing, after plasticizing evenly, adding antioxidant, magnesium hydroxide, expansible graphite, flame-retardant synergist and lubricant, mixing evenly to discharge strips, using a flat vulcanizing machine for hot-pressing and chill pressing at room temperature to obtain the finished product. When the composite material of the invention is burnt, low smoke is generated and no molten drop and no toxic gas are produced and the material has good flame resistance and mechanical properties.

Description

A kind of low smoke non-halogen flame retardant thermoplastic elastomer composite material and preparation method thereof
Technical field
The present invention relates to a kind of thermoplastic elastomer composite material and preparation method thereof, relate in particular to a kind of low smoke non-halogen flame retardant thermoplastic elastomer composite material based on hydrogenated styrene-butadiene-styrene block copolymers (SEBS) and preparation method thereof, belong to chemical material technical field.
Background technology
Thermoplastic elastomer becomes one of material most popular in the synthetic rubber owing to have snappiness and good plasticity-concurrently.Styrene analog thermoplastic elastomer (SBC) is prevailing in the world thermoplastic elastic material, and product is based on SBS, SIS and corresponding hydrogenation product.Hydrogenated styrene-butadiene-styrene block copolymers (SEBS) is the hydrogenation modification product of styrene-butadiene-styrene block copolymer SBS, has been the broad-spectrum novel thermoplastic elastomer material of generally acknowledging in the world since industrialization in 1972 always.Because the carbon-to-carbon double bond in the molecular structure is hydrogenated saturated, therefore SEBS not only has good weather, ageing resistance, thermotolerance, compression deformability, insulativity, and have good blended characteristic, processing characteristics and an excellent oil-filled property, goods hand feel and drape, performance are even, size is controlled easily, scrap stock are reusable, therefore the recovery utilization rate height is widely used in fields such as automobile making, medicine equipment, packing, electronic product, electric wire, sports equipment and daily necessities.
Because the oxygen index of SEBS only has 18%, SEBS and intermingling material thereof be heated easily decompose, goods are inflammable, and can produce thick smoke and molten drop during burning, just may be caused serious fire failure in case ignite, lives and properties to the mankind constitute serious threat, therefore, caused widely based on the fire-retardant problem of the matrix material of SEBS and paid close attention to.And along with the enhancing of people's environmental consciousness and the appearance of corresponding environmental regulation, having macromolecular material Non-halogen Flame Retardant Technology that nontoxic, low cigarette, burning do not discharge corrosive gases has become the main flow direction of the fire-retardant research and development of macromolecular material, therefore, the research that the matrix material based on SEBS is carried out low-smoke non-halogen flame-retardant also just becomes at present investigators' research focus both at home and abroad.
Magnesium hydroxide is the halogen-free flame retardants of using always, and its advantage is a good stability, does not produce poisonous and hazardous gas during burning, and has the splendid cigarette effect that presses down, and cheap.But the flame retarding efficiency of magnesium hydroxide is low, and is poor with the consistency of matrix resin, and it is big to reach certain required loading level of flame retardant resistance when using separately, easily causes the mechanical property severe exacerbation of fire retardant material matrix, and causes processing difficulties.People such as Wang-Dong Xiao have delivered Comparison of Aluminium Hydroxideand Magnesium Hydroxide as Flame Retardants in SEBS-Based Composites (Polym.Polym.Compos., 2008,16 (7), 415) literary composition, systematically studied magnesium hydroxide, aluminium hydroxide uses separately and is used oil-filled SEBS and polypropylene co-mixing system mechanical property, the influence of flame retardant properties and thermostability etc., but in this piece of writing report, if make flame-retardant system reach the UL94V-0 grade, use magnesium hydroxide or aluminium hydroxide separately, then need to add to 75% and 70% of total system quality respectively, and the tensile strength of flame-retardant system only is about 5MPa at this moment, elongation at break also has only about 100%, compare with flame-retardant system not, tensile strength and elongation at break have descended about 40% and 86% respectively.
Chinese invention patent application CN200710046721.6 discloses with a kind of non-bittern flame-proof elastomer composite materials of preparation such as Ethylene-Propylene Block Copolymer, SEBS, ethylene-vinyl acetate copolymer (EVA), magnesium hydroxide, encapsulated red phosphorus, phosphoric acid ester, compatilizer and preparation method thereof, its product tensile strength is greater than 12MPa, extension at break can reach the UL94V-0 level greater than 300%.This application makes matrix material possess good flame retardancy and mechanical property simultaneously with the fire retarding synergist of red phosphorus as magnesium hydroxide.But because there are many drawbacks in red phosphorus in actual applications, for example red phosphorus is inflammable, the dust explosive, easily moisture absorption and be oxidized to acid, and emit hypertoxic gas phosphuret-(t)ed hydrogen, and be difficult for being dispersed in the superpolymer when using, therefore, red phosphorus must could use safely and effectively through certain surface treatment, and simultaneously, the fire retardant material that contains red phosphorus can discharge irritating smell when burning, and the amount of being fuming is big, can not satisfy the requirement of LSZH.
Expansible black lead (EG) aboundresources, cheap, low cigarette, nontoxic has become the focus that current halogen-free flame retardants is studied.There is the low problem of flame retarding efficiency when but, using EG fire retardant polyolefin base polymer separately equally.
Summary of the invention
The purpose of this invention is to provide a kind of environmental protection, safety, the low smoke non-halogen flame retardant thermoplastic elastomer composite material prescription of environmental sound.Low cigarette does not have molten drop during this material combustion, can not discharge toxic gas, and have good flame retardancy and mechanical property, the recovery utilization rate height.
A kind of low smoke non-halogen flame retardant thermoplastic elastomer composite material, by weight percentage, its composition of raw materials is made of following component:
SEBS 20~35%
Paraffin oil 12~20%
Polypropylene 10~20%
Magnesium hydroxide 30~46%
Expansible black lead 3~8%
Fire retarding synergist 1.0~3.5%
Lubricant 1.0~1.8%
Oxidation inhibitor 0.2~0.4%
Described polypropylene is a homo-polypropylene, and melt flow rate MFR is 3~11g/10min;
Described magnesium hydroxide is through the surface-modifying agent modification, and median size is less than 2 microns magnesium hydroxide;
The carbon content of described expansible black lead>95%, allowance for expansion are 180~250mL/g, and particle diameter is 0.15~0.25mm, and the pH value is 6~7;
Described fire retarding synergist is one or more in gas-phase silica, zinc borate or the organic modification montmonrillonite;
The additive that lubricant of the present invention and oxidation inhibitor use when being the commonly used plastic working of this technical field.
Be further to realize that the object of the invention, described lubricant are a kind of in silicone master batch or the organic silicone oil.
Described oxidation inhibitor is one or both in phenolic antioxidant or the phosphite ester kind antioxidant.
The preparation method of described low smoke non-halogen flame retardant thermoplastic elastomer composite material comprises the steps:
(1) according to composition of raw materials, SEBS and paraffin oil are dropped in the high-speed mixer, left standstill behind the thorough mixing 20~28 hours, make the abundant swelling of SEBS;
(2) polypropylene that SEBS and prescription are weighed after two roll temperatures are to add the swelling that is obtained by step (1) on 160~165 ℃ the open mill carries out mixing, after the plasticizing evenly, add the oxidation inhibitor that prescription is weighed, magnesium hydroxide, expansible black lead, fire retarding synergist and lubricant, continue mixing, treat mixing even back slice, mixing time 15~20min; Then on vulcanizing press in 175~180 ℃ of following hot pressing, room temperatures cold pressing, slice.
Compared with prior art, the present invention has following advantage:
(1) the present invention adopts magnesium hydroxide and expansible black lead fire retardant systems, has produced good synergism between two kinds of fire retardants, and goods reach the UL94V-0 level, and required fire retardant total addition level has only 38.5~50% (weight);
(2) halogen-free flame-retardant thermoplastic elastomer matrix material of the present invention has than more excellent mechanical property when reaching the UL94V-0 grade, and tensile strength reaches 10~14MPa, elongation at break>400%;
(3) fire retardant material of the present invention is environmentally friendly, and low cigarette does not have molten drop during burning, can not discharge toxic gas, and production process is safe and reliable;
(4) fire retardant material raw material of the present invention is easy to get, and formulation cost is low, and the recovery utilization rate height can 100% recycling.
Embodiment
The present invention is further illustrated below in conjunction with embodiment, but embodiments of the invention are not limited thereto.
Starting material of the present invention can directly be bought from market, and table 1 has been listed the raw-material trade mark of part and the production firm that can supply the present invention to select for use in detail.
The raw-material trade mark of table 1 and production firm
Figure G2009100421851D00041
Embodiment 1
A kind of low smoke non-halogen flame retardant thermoplastic elastomer composite material, its formula for raw stock is as follows:
Raw-material weight percentage ratio
SEBS 26%
Paraffin oil 20%
Polypropylene 13%
Magnesium hydroxide 30%
Expansible black lead 8.0%
Zinc borate 1.8%
Lubricant 1.0%
B215 0.2%
The trade mark of SEBS is G1651, and polypropylene is Maoming petrochemical industry T30S, MFR=3.0g/10min; Median size<2 of the magnesium hydroxide that Zhengzhou Fulong New Material Technology Co., Ltd. produces micron are the magnesium hydroxides through surface modification; The carbon content of expansible black lead is 99%, and allowance for expansion is 180mL/g, and particle diameter is 0.25mm; Zinc borate is commercially available 2ZnO.3B 2O 3.3.5H 2O, the Shandong Zibo five dimension zinc borate ZB-2335 of Industrial Co., Ltd., losing the crystal water temperature is 320 ℃; Lubricant is silicone master batch MB50-001.
The preparation method of above-mentioned matrix material comprises following processing step:
(1) according to composition of raw materials, SEBS and paraffin oil are dropped in the high-speed mixer, left standstill behind the thorough mixing 24 hours, make the abundant swelling of SEBS;
(2) polypropylene that SEBS and prescription are weighed after two roll temperatures are to add the swelling that is obtained by step (1) on 165 ℃ the open mill carries out mixing, after the plasticizing evenly, add the oxidation inhibitor that prescription is weighed, magnesium hydroxide, expansible black lead, fire retarding synergist and lubricant, continue mixing, treat mixing even back slice, mixing time 15min; Then on vulcanizing press in 180 ℃ of following hot pressing, room temperatures cold pressing, slice, make the sample that thickness is 4mm.
The fire retardant total addition level of present embodiment matrix material is 39.8% of total system quality.By the mechanical property of GB GB/T528-92 test compound material, wherein tensile strength and elongation at break are respectively 12.5MPa and 603%.Shore A hardness carries out according to GB GB/T531-92, and test result is 84.The vertical combustion test is the UL94V-0 level, and oxygen index carries out according to GB GB/T2406-93, and test result is 29.2%.
Embodiment 2
A kind of low smoke non-halogen flame retardant thermoplastic elastomer composite material, its formula for raw stock is as follows:
Raw-material weight percentage ratio
SEBS 30%
Paraffin oil 15%
Polypropylene 15%
Magnesium hydroxide 30%
Expansible black lead 6.0%
Organic modification montmonrillonite 2.5%
Lubricant 1.2%
B215 0.3%
The trade mark of SEBS is G1651, and polypropylene is Maoming petrochemical industry T30S, MFR=3.0g/10min; Median size<2 of the magnesium hydroxide that Zhengzhou Fulong New Material Technology Co., Ltd. produces micron are the magnesium hydroxides through surface modification; The carbon content of expansible black lead is 95%, and allowance for expansion is 220mL/g, and particle diameter is 0.18mm; The interlamellar spacing of organic modification montmonrillonite is 3.8nm; Lubricant is the DC200 dimethyl silicone oil, and viscosity is 12500CST.
The preparation method of above-mentioned matrix material comprises following processing step:
(1) according to composition of raw materials, SEBS and paraffin oil are dropped in the high-speed mixer, left standstill behind the thorough mixing 24 hours, make the abundant swelling of SEBS;
(2) polypropylene that SEBS and prescription are weighed after two roll temperatures are to add the swelling that is obtained by step (1) on 165 ℃ the open mill carries out mixing, after the plasticizing evenly, add the oxidation inhibitor that prescription is weighed, magnesium hydroxide, expansible black lead, fire retarding synergist and lubricant, continue mixing, treat mixing even back slice, mixing time 18min; Then on vulcanizing press in 180 ℃ of following hot pressing, room temperatures cold pressing, slice, make the sample that thickness is 4mm.
The fire retardant total addition level of present embodiment matrix material is 38.5% of total system quality.By the mechanical property of GB GB/T528-92 test compound material, wherein tensile strength and elongation at break are respectively 14.1MPa and 535%.Shore A hardness carries out according to GB GB/T531-92, and test result is 89.The vertical combustion test is the UL94V-0 level, and oxygen index carries out according to GB GB/T2406-93, and test result is 29.9%.
Embodiment 3
A kind of low smoke non-halogen flame retardant thermoplastic elastomer composite material, its formula for raw stock is as follows:
Raw-material weight percentage ratio
SEBS 24%
Paraffin oil 12%
Polypropylene 12%
Magnesium hydroxide 46%
Expansible black lead 3.0%
Gas-phase silica 1.0%
Lubricant 1.8%
B215 0.2%
The trade mark of SEBS is G1651, and polypropylene is Thailand petrochemical industry 1100NK, MFR=11.0g/10min; Median size<2 of the magnesium hydroxide that Zhengzhou Fulong New Material Technology Co., Ltd. produces micron are the magnesium hydroxides through surface modification; The carbon content of expansible black lead is 99%, and allowance for expansion is 250mL/g, and particle diameter is 0.15mm; Gas-phase silica is the gas-phase silica HL-200 of Guangzhou Science and Technology Ji Sheng Industrial Co; Lubricant is silicone master batch MB50-001.
The preparation method of above-mentioned matrix material comprises following processing step:
(1) according to composition of raw materials, SEBS and paraffin oil are dropped in the high-speed mixer, left standstill behind the thorough mixing 24 hours, make the abundant swelling of SEBS;
(2) polypropylene that SEBS and prescription are weighed after two roll temperatures are to add the swelling that is obtained by step (1) on 160 ℃ the open mill carries out mixing, after the plasticizing evenly, add the oxidation inhibitor that prescription is weighed, magnesium hydroxide, expansible black lead, fire retarding synergist and lubricant, continue mixing, treat mixing even back slice, mixing time 20min; Then on vulcanizing press in 175 ℃ of following hot pressing, room temperatures cold pressing, slice, make the sample that thickness is 4mm.
The fire retardant total addition level of present embodiment matrix material is 50% of total system quality.By the mechanical property of GB GB/T528-92 test compound material, wherein tensile strength and elongation at break are respectively 10.2MPa and 449%.Shore A hardness carries out according to GB GB/T531-92, and test result is 90.The vertical combustion test is the UL94V-0 level, and oxygen index carries out according to GB GB/T2406-93, and test result is 31.5%.
Embodiment 4
A kind of low smoke non-halogen flame retardant thermoplastic elastomer composite material, its formula for raw stock is as follows:
Raw-material weight percentage ratio
SEBS 20%
Paraffin oil 12%
Polypropylene 20%
Magnesium hydroxide 38%
Expansible black lead 5.0%
Organic modification montmonrillonite 2.0%
Gas-phase silica 1.5%
Lubricant 1.1%
B215 0.4%
The trade mark of SEBS is G1651, and polypropylene is Maoming petrochemical industry T30S, MFR=3.0g/10min; Median size<2 of the magnesium hydroxide that Zhengzhou Fulong New Material Technology Co., Ltd. produces micron are the magnesium hydroxides through surface modification; The carbon content of expansible black lead is 95%, and allowance for expansion is 220mL/g, and particle diameter is 0.18mm; The interlamellar spacing of organic modification montmonrillonite is 3.8nm; Gas-phase silica is the gas-phase silica HL-200 of Guangzhou Science and Technology Ji Sheng Industrial Co; Lubricant is silicone master batch MB50-001.
The fire retardant total addition level of present embodiment matrix material is 46.5% of total system quality.The preparation method of matrix material is identical with embodiment 2, and it is as follows to do the Performance Detection test-results.By the mechanical property of GB GB/T528-92 test compound material, wherein tensile strength and elongation at break are respectively 11.2MPa and 431%.Shore A hardness carries out according to GB GB/T531-92, and test result is 94.The vertical combustion test is the UL94V-0 level, and oxygen index carries out according to GB GB/T2406-93, and test result is 29.5%.
Embodiment 5
A kind of low smoke non-halogen flame retardant thermoplastic elastomer composite material, its formula for raw stock is as follows:
Raw-material weight percentage ratio
SEBS 35%
Paraffin oil 15%
Polypropylene 10%
Magnesium hydroxide 30%
Expansible black lead 6.0%
Organic modification montmonrillonite 2.5%
Lubricant 1.2%
B215 0.3%
The trade mark of SEBS is G1654, and polypropylene is Maoming petrochemical industry T30S, MFR=3.0g/10min; The rich imperial novel material science and technology in Zhengzhou has. and median size<2 of the magnesium hydroxide that limit company produces micron are the magnesium hydroxides through surface modification; The carbon content of expansible black lead is 95%, and allowance for expansion is 220mL/g, and particle diameter is 0.18mm; The interlamellar spacing of organic modification montmonrillonite is 3.8nm; Lubricant is the DC200 dimethyl silicone oil, and viscosity is 12500CST.
The fire retardant total addition level of present embodiment matrix material is 38.5% of total system quality.The preparation method of matrix material is identical with embodiment 2, and it is as follows to do the Performance Detection test-results.By the mechanical property of GB GB/T528-92 test compound material, wherein tensile strength and elongation at break are respectively 12.0MPa and 473%.Shore A hardness carries out according to GB GB/T531-92, and test result is 87.The vertical combustion test is the UL94V-0 level, and oxygen index carries out according to GB GB/T2406-93, and test result is 29.6%.
Comparative Examples
A kind of Comparative Examples of low smoke non-halogen flame retardant thermoplastic elastomer composite material, its formula for raw stock is as follows:
Raw-material weight percentage ratio
SEBS 24%
Paraffin oil 12%
Polypropylene 12%
Magnesium hydroxide 50%
Lubricant 1.8%
B215 0.2%
The trade mark of SEBS is G1651, and polypropylene is Thailand petrochemical industry 1100NK, MFR=11.0g/10min; Median size<2 of the magnesium hydroxide that Zhengzhou Fulong New Material Technology Co., Ltd. produces micron are the magnesium hydroxides through surface modification; Lubricant is silicone master batch MB50-001.
The preparation method of above-mentioned matrix material comprises following processing step:
(1) according to composition of raw materials, SEBS and paraffin oil are dropped in the high-speed mixer, left standstill behind the thorough mixing 24 hours, make the abundant swelling of SEBS;
(2) polypropylene that SEBS and prescription are weighed after two roll temperatures are to add the swelling that is obtained by step (1) on 160 ℃ the open mill carries out mixing, after the plasticizing evenly, add the oxidation inhibitor that prescription is weighed, magnesium hydroxide, silicone master batch, continue mixing, treat mixing even back slice, mixing time 20min; Then on vulcanizing press in 175 ℃ of following hot pressing, room temperatures cold pressing, slice, make the sample that thickness is 4mm.
By the mechanical property of GB GB/T528-92 test compound material, wherein tensile strength and elongation at break are respectively 11.0MPa and 476%.Shore A hardness carries out according to GB GB/T531-92, and test result is 91.The test of UL94 vertical combustion is not passed through, and oxygen index carries out according to GB GB/T2406-93, and test result is 30.7%.
In the prior art, because preparing Halogenless fire retarded polymer matrix material ubiquity with metal hydroxides as the main body fire retardant, flame retarding efficiency low, poor with the consistency of matrix resin, required loading level is big, easily cause the mechanical property severe exacerbation of fire retardant material matrix, and cause the problem of processing difficulties etc., therefore the halogen-free flameproof research based on the matrix material of SEBS is concentrated on expansion-type N-P flame-retarding agent mostly, systems such as inorganic phosphorus system or organic phosphorus flame retardant, yet such technical measures lost with metal hydroxides as the main body fire retardant had with low cost, LSZH, the stable advantage that waits of fire-retardant product.Two kinds of fire retardants of compound magnesium hydroxide of the present invention and expansible black lead make fire retardant material form fine and close continuously expansion carbon-coating in combustion processes, this charcoal layer plays the effect of heat insulation oxygen barrier, thereby delayed the decomposition of polymeric matrix effectively, slow down the generation and the release of inflammable gas in the thermooxidative degradation process, thereby improved flame retardant effect.The adding of fire retarding synergist such as gas-phase silica, organic modification montmonrillonite, further improved the density and the intensity of carbon-coating again, made the flame retardant thermoplastic elastomer composite material goods reach the required fire retardant total addition level of UL94V-0 level and reduce (between 38.5~50%).Simultaneously, surface modification magnesium hydroxide and matrix have better consistency, and flame-proof composite material has than more excellent mechanical property when reaching the UL94V-0 grade, and tensile strength reaches 10~14MPa, elongation at break>400%; Solved to a great extent with metal hydroxides and prepared the existing problem of Halogenless fire retarded polymer matrix material as the main body fire retardant.Fire retardant material of the present invention is environmentally friendly, low cigarette does not have molten drop during burning, can not discharge toxic gas, and recycling of materials rate height, can 100% recycle, have certain economic benefits and social benefit, can be widely used in automobile, building, electronics or electrical equipment need halogen-free flameproof with wire rod etc. field
The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not subjected to the restriction of above-mentioned example; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (4)

1, a kind of low smoke non-halogen flame retardant thermoplastic elastomer composite material is characterized in that: by weight percentage, its composition of raw materials is made of following component:
SEBS 20~35%
Paraffin oil 12~20%
Polypropylene 10~20%
Magnesium hydroxide 30~46%
Expansible black lead 3~8%
Fire retarding synergist 1.0~3.5%
Lubricant 1.0~1.8%
Oxidation inhibitor 0.2~0.4%
Described polypropylene is a homo-polypropylene, and melt flow rate MFR is 3~11g/10min;
Described magnesium hydroxide is through the surface-modifying agent modification, and median size is less than 2 microns magnesium hydroxide;
The carbon content of described expansible black lead>95%, allowance for expansion are 180~250mL/g, and particle diameter is 0.15~0.25mm, and the pH value is 6~7;
Described fire retarding synergist is one or more in gas-phase silica, zinc borate or the organic modification montmonrillonite.
2, low smoke non-halogen flame retardant thermoplastic elastomer composite material according to claim 1 is characterized in that, described lubricant is a kind of in silicone master batch or the organic silicone oil.
3, low smoke non-halogen flame retardant thermoplastic elastomer composite material according to claim 1 is characterized in that, described oxidation inhibitor is one or both in phenolic antioxidant or the phosphite ester kind antioxidant.
4, the preparation method of the described low smoke non-halogen flame retardant thermoplastic elastomer composite material of claim 1 is characterized in that comprising the steps:
(1) according to composition of raw materials, SEBS and paraffin oil are dropped in the high-speed mixer, left standstill behind the thorough mixing 20~28 hours, make the abundant swelling of SEBS;
(2) polypropylene that SEBS and prescription are weighed after two roll temperatures are to add the swelling that is obtained by step (1) on 160~165 ℃ the open mill carries out mixing, after the plasticizing evenly, add the oxidation inhibitor that prescription is weighed, magnesium hydroxide, expansible black lead, fire retarding synergist and lubricant, continue mixing, treat mixing even back slice, mixing time 15~20min; Then on vulcanizing press in 175~180 ℃ of following hot pressing, room temperatures cold pressing, slice.
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