CN115368669B - Polyolefin composition and preparation method and application thereof - Google Patents
Polyolefin composition and preparation method and application thereof Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims abstract description 24
- 229920000098 polyolefin Polymers 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 39
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 26
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 14
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 14
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 14
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 13
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 13
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 12
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 9
- 229920001971 elastomer Polymers 0.000 claims abstract description 8
- 239000000806 elastomer Substances 0.000 claims abstract description 8
- 239000004698 Polyethylene Substances 0.000 claims abstract description 7
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 7
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 7
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 claims abstract description 6
- 235000006708 antioxidants Nutrition 0.000 claims description 38
- GVJHHUAWPYXKBD-IEOSBIPESA-N α-tocopherol Chemical compound OC1=C(C)C(C)=C2O[C@@](CCC[C@H](C)CCC[C@H](C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-IEOSBIPESA-N 0.000 claims description 24
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 14
- 150000003568 thioethers Chemical class 0.000 claims description 14
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 230000004913 activation Effects 0.000 claims description 12
- 229940087168 alpha tocopherol Drugs 0.000 claims description 12
- 229960000984 tocofersolan Drugs 0.000 claims description 12
- 239000002076 α-tocopherol Substances 0.000 claims description 12
- 235000004835 α-tocopherol Nutrition 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 9
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 5
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims 1
- 125000001020 α-tocopherol group Chemical group 0.000 claims 1
- 230000032683 aging Effects 0.000 abstract description 22
- 239000003063 flame retardant Substances 0.000 abstract description 13
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 abstract description 12
- 230000014759 maintenance of location Effects 0.000 abstract description 9
- 239000000440 bentonite Substances 0.000 abstract 1
- 229910000278 bentonite Inorganic materials 0.000 abstract 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 13
- 238000013329 compounding Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- KGRVJHAUYBGFFP-UHFFFAOYSA-N 2,2'-Methylenebis(4-methyl-6-tert-butylphenol) Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O KGRVJHAUYBGFFP-UHFFFAOYSA-N 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 230000003679 aging effect Effects 0.000 description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical group [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 3
- 230000003712 anti-aging effect Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229910000077 silane Inorganic materials 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical group CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- PWWSSIYVTQUJQQ-UHFFFAOYSA-N distearyl thiodipropionate Chemical group CCCCCCCCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCCCCCCCC PWWSSIYVTQUJQQ-UHFFFAOYSA-N 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000201308 Boschniakia Species 0.000 description 1
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229910001853 inorganic hydroxide Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention relates to a polyolefin composition, a preparation method and application thereof, and the composition comprises the following components: PE grafted maleic anhydride, metallocene linear low density polyethylene LLDPE, POE elastomer, ethylene-vinyl acetate copolymer EVA, aluminum hydroxide, magnesium hydroxide, bentonite, silane coupling agent and antioxidant. The polyolefin composition provided by the invention has good flame retardant property, and still has good tensile strength and elongation at break retention after 7 days of air heat aging at 180 ℃.
Description
Technical Field
The invention belongs to the field of plastic modified materials, and particularly relates to a polyolefin composition, a preparation method and application thereof.
Background
In order to meet the characteristic of low smoke and zero halogen, a large amount of hydroxide flame retardant is often used for filling so as to meet the flame retardant property required by the standard. However, after a large amount of inorganic hydroxide is added, the mechanical property, especially the thermal oxidation aging property of the material is greatly attenuated, the insulating material is generally close to a conductor and heats for a long time, and serious quality accidents can be caused if the thermal aging property of the low-smoke halogen-free polyolefin insulating material does not reach the standard.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a polyolefin composition, a preparation method and application thereof.
The invention relates to a polyolefin composition, which comprises the following components in parts by weight:
wherein the oil absorption value of the aluminum hydroxide is less than or equal to 40 percent; the oil absorption value test standard is GB/T3780.2-2017;
the smaller the oil absorption value of the aluminum hydroxide is, the more regular the crystal form is, the higher the regularity of the whole powder is, and the improvement of the conventional performance, the flame retardant performance and the aging performance is facilitated;
the magnesium hydroxide is silane coated magnesium hydroxide, and the activation degree is more than or equal to 90%; activation degree test standard GBT 19281-2014;
the magnesium hydroxide is well coated by the silane, has excellent compatibility with resin, good dispersibility and ensures excellent ageing resistance.
The compound antioxidant is a mixture of alpha-tocopherol, phosphite antioxidants and thioether antioxidants. The alpha-tocopherol in the compound antioxidant has good main anti-effect, and can achieve excellent anti-thermo-oxidative aging effect by being matched with phosphite and thioether antioxidants with high temperature resistance.
PE grafted maleic anhydride: polyethylene grafted maleic anhydride
POE elastomer: ethylene-octene copolymer elastomer.
Preferably, the oil absorption value of the aluminum hydroxide is 30-35%.
Preferably, the degree of activation of the silane coated magnesium hydroxide is 95-99%.
Preferably, the mass ratio of the alpha-tocopherol to the phosphite antioxidant to the thioether antioxidant is 0.5-1:0.3-0.7:0.2-0.5.
Preferably, the phosphite antioxidant is antioxidant 168 or antioxidant 628; the thioether antioxidant is DSTDP, DLTDP, etc.
Preferably, the components comprise, by weight:
the preparation method of the polyolefin composition comprises the following steps:
PE grafted maleic anhydride, metallocene linear low-density polyethylene LLDPE, POE elastomer, ethylene-vinyl acetate copolymer EVA, compound antioxidant and silane coupling agent are put into a high-speed mixer according to the proportion, and are mixed uniformly, the final mixture, magnesium hydroxide, aluminum hydroxide and montmorillonite are put into an internal mixer according to the proportion, and are extruded and granulated through a double-stage single-screw extruder after being banburying by the internal mixer, wherein the temperature of the internal mixer is controlled at 100-130 ℃, and the temperature of the single-screw extruder is controlled at 140-150 ℃.
The use of one of the polyolefin compositions of the invention in wire or cable.
Principle of: the metallocene linear low-density polyethylene LLDPE, the POE elastomer and the ethylene-vinyl acetate copolymer EVA are taken as matrix resins, and aluminum hydroxide, magnesium hydroxide and montmorillonite are taken as flame retardants, so that the flame retardant has good flame retardant, low smoke and anti-dripping effects when being compounded and used, and the magnesium hydroxide with the oil absorption value of less than or equal to 40 percent, the activation degree of more than or equal to 90 percent has good compatibility and dispersibility and excellent ageing resistance. The silane coupling agent further strengthens the binding force between the powder and the resin, so that the microscopic defect of the material is smaller, and the flame retardant and ageing properties are further optimized. The compound antioxidant provides excellent anti-aging effect, and can achieve better anti-aging performance when being used together with magnesium hydroxide (the activation degree is more than or equal to 90%) and aluminum hydroxide (the oil absorption value is less than or equal to 40%).
Advantageous effects
The polyolefin composition provided by the invention has good flame retardant property, and still has good tensile strength and elongation at break retention after 7 days of air heat aging at 180 ℃.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
1. Raw material source
PE grafted maleic anhydride: MC-218, light generated from energy;
metallocene linear low density polyethylene LLDPE: LLDPE ENGAGE 3518PA, produced from exxon mobil;
POE elastomer: POE 891, dow chemical;
ethylene-vinyl acetate copolymer EVA; EVA 00328, produced from Exxon Mobil;
aluminum hydroxide-1: middle aluminum group H-WF-10-LS; the oil absorption value is 30%;
aluminum hydroxide-2: middle aluminum group H-WF-10; the oil absorption value is 35%;
aluminum hydroxide-3: middle aluminum group H-WF-3; the oil absorption value is 40%;
aluminum hydroxide-4: a medium aluminum group H-WF-1; an oil absorption value of 50%;
magnesium hydroxide-1: jinhaohui real development Co., ltd.): JLH-QE2 activation degree 99%;
magnesium hydroxide-2: jinhaohui real development Co., ltd.): JLH-QE4 activation degree is 95%;
magnesium hydroxide-3: jinhaohui real development Co., ltd.): JLH-QD2 activation degree 90%;
magnesium hydroxide-4: jinhaohui real development Co., ltd.): JLH-QD4 activation was 85%;
montmorillonite: are commercially available;
silane coupling agent: KH-550, commercially available;
alpha-tocopherol: the product of Boschniakia (Shanghai) chemical industry development Co., ltd, model T2309;
phosphite antioxidants: an antioxidant 168, basf;
thioether antioxidants: antioxidant DSTDP, basf;
hindered phenol antioxidant: an antioxidant 1010, basf;
compounding an antioxidant-1: alpha-tocopherol, phosphite antioxidant, thioether antioxidant 1:0.5:0.3;
compounding an antioxidant-2: alpha-tocopherol, phosphite antioxidant and thioether antioxidant in 0.5:0.3:0.2
Compounding an antioxidant-3: alpha-tocopherol, phosphite antioxidant, thioether antioxidant 1:0.7:0.5;
compounding an antioxidant-4: alpha-tocopherol, phosphite antioxidants, thioether antioxidants 0.4:1:0.7;
compounding an antioxidant-5: alpha-tocopherol, phosphite antioxidant 1:0.5;
compounding an antioxidant-6: alpha-tocopherol, thioether antioxidant 1:0.3;
compounding an antioxidant-7: phosphite antioxidant and thioether antioxidant in the ratio of 0.5 to 0.3;
compounding an antioxidant-8: hindered phenol antioxidant, phosphite antioxidant and thioether antioxidant in the ratio of 1 to 0.5 to 0.3.
The compound antioxidant is prepared by mixing all antioxidants according to mass proportion.
The montmorillonite and the silane coupling agent used in the parallel examples and the comparative examples are the same commercial product.
2. Preparation methods of examples and comparative examples
PE grafted maleic anhydride, metallocene linear low-density polyethylene LLDPE, POE elastomer, ethylene-vinyl acetate copolymer EVA, compound antioxidant and silane coupling agent are put into a high-speed mixer according to the proportion, uniformly mixed at the rotating speed of 1000-2000rpm, the final mixture, magnesium hydroxide, aluminum hydroxide and Mono-rubbing soil are put into an internal mixer according to the proportion, and extruded and granulated through a double-order single-screw extruder after being internally mixed by the internal mixer, wherein the temperature of the internal mixer is controlled at 100-130 ℃, and the temperature of the single-screw extruder is controlled at 140-150 ℃.
3. Test criteria and methods
1. Sample preparation:
the obtained polyolefin composition was tabletted on a flat vulcanizing machine at 180℃for 10min under a pressure of 15MPa and a sample thickness of 1mm.
2. Mechanical testing
2.1 tensile Strength test before aging: GB/T1040.2-2006, test conditions: the stretching rate is 250mm/min;
2.2 tensile Strength test after aging: and placing the sample in an air circulation aging box at 180 ℃ for 7 days, taking out the aged sample, and testing the tensile strength according to GB/T1040.2-2006.
Tensile strength retention after aging was calculated: retention of tensile strength after aging= (tensile strength after aging/tensile strength before aging) ×100%.
2.3 elongation at break test before aging: GB/T1040.2-2006; test conditions: the stretching rate is 250mm/min;
2.4 elongation at break test after aging: placing the sample in an air circulation aging box at 180 ℃ for 7 days, taking out the aged sample, and testing the elongation at break according to GB/T1040.2-2006;
tensile strength retention after aging was calculated: tensile strength retention after aging= (elongation at break after aging/elongation at break before aging) ×100%.
3. Flame retardant rating test grade: GB/T32129-2015 low-smoke halogen-free material standard test method
Table 1 shows the proportions (parts by weight) of the examples
Table 2 proportion (parts by weight) of comparative examples
Table 3 shows performance effect data for the examples
Table 4 performance effect data for comparative example
The strength of the obtained example materials is more than 16MPa; the elongation is more than 200 percent, and the flame retardant grade reaches the B1 grade; and the retention rate of mechanical properties after ageing is above 80%, even the retention rate of some examples reaches 90%, the conventional performance and high-temperature ageing resistance and flame retardant property are very excellent, while in comparative example 1, aluminum hydroxide with an oil absorption value of more than 40% and magnesium hydroxide with an activation degree of less than 90% are adopted, so that the tensile property is poor, the flame retardant grade is insufficient, the high-temperature ageing performance is extremely poor, the retention rate of elongation is even totally lower than 60%, and the long-term use in a high-temperature environment is completely impossible. Compared with comparative examples 3-5 and examples, the three antioxidants of the present invention are adopted to synergistically act, and have excellent anti-aging effects.
Claims (6)
1. A polyolefin composition characterized by comprising the following components in parts by weight:
wherein the oil absorption value of the aluminum hydroxide is 30% -40%;
the magnesium hydroxide is coated by a silane coupling agent, and the activation degree is 90% -99%;
the compound antioxidant is a mixture of alpha-tocopherol, phosphite antioxidants and thioether antioxidants; wherein the compound antioxidant is alpha-tocopherol, phosphite antioxidants and thioether antioxidants with the mass ratio of (0.5-1): (0.3-0.7): (0.2-0.5) or 0.4:1:0.7.
2. The composition of claim 1 wherein the aluminum hydroxide has an oil absorption value of 30 to 35%.
3. The composition of claim 1, wherein the degree of activation of the silane coupling agent coated magnesium hydroxide is 95-99%.
4. The composition of claim 1, wherein the composition comprises, in parts by weight:
5. a process for preparing the polyolefin composition of claim 1 comprising:
PE grafted maleic anhydride, metallocene linear low-density polyethylene LLDPE, POE elastomer, ethylene-vinyl acetate copolymer EVA, compound antioxidant and silane coupling agent are put into a high-speed mixer according to the proportion, and are mixed uniformly, the final mixture, magnesium hydroxide, aluminum hydroxide and montmorillonite are put into an internal mixer according to the proportion, and are extruded and granulated through a double-stage single-screw extruder after being banburying by the internal mixer, wherein the temperature of the internal mixer is controlled at 100-130 ℃, and the temperature of the single-screw extruder is controlled at 140-150 ℃.
6. Use of the polyolefin composition of claim 1 in wire and cable.
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