CN116102817A - High-light-transmittance halogen-free flame-retardant polyolefin sheath material and preparation method thereof - Google Patents
High-light-transmittance halogen-free flame-retardant polyolefin sheath material and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 47
- 239000003063 flame retardant Substances 0.000 title claims abstract description 35
- 229920000098 polyolefin Polymers 0.000 title claims abstract description 29
- 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 title claims abstract description 28
- 238000002834 transmittance Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000000779 smoke Substances 0.000 claims abstract description 23
- 239000006229 carbon black Substances 0.000 claims abstract description 22
- 229920001577 copolymer Polymers 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 10
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 8
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 8
- 229920013716 polyethylene resin Polymers 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000007822 coupling agent Substances 0.000 claims abstract description 5
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 5
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 5
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 5
- 239000000314 lubricant Substances 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 27
- 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 16
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 16
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 15
- 238000004898 kneading Methods 0.000 claims description 13
- 239000000155 melt Substances 0.000 claims description 12
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 229920001038 ethylene copolymer Polymers 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000003508 Dilauryl thiodipropionate Substances 0.000 claims description 5
- 235000019304 dilauryl thiodipropionate Nutrition 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 229960000892 attapulgite Drugs 0.000 claims description 4
- 229910052625 palygorskite Inorganic materials 0.000 claims description 4
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims description 4
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 3
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 3
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 2
- 239000000347 magnesium hydroxide Substances 0.000 claims description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 claims 7
- 230000005540 biological transmission Effects 0.000 claims 6
- 150000001875 compounds Chemical class 0.000 claims 2
- 238000005336 cracking Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 229920001169 thermoplastic Polymers 0.000 abstract description 4
- 239000004416 thermosoftening plastic Substances 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 8
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
- 238000005469 granulation Methods 0.000 description 3
- 230000003179 granulation Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- -1 (2, 4-di-tert-butyl) phenyl Chemical group 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a high-light-transmission halogen-free flame-retardant polyolefin sheath material and a preparation method thereof, wherein the sheath material comprises the following raw materials in parts by weight: 9-14 parts of polyethylene resin, 20-25 parts of ethylene-vinyl acetate copolymer, 10-15 parts of ethylene-octene copolymer, 5-10 parts of compatilizer, 1-2 parts of carbon black master batch, 90-100 parts of flame retardant, 3-5 parts of smoke suppressant, 3-8 parts of shell forming agent, 0.3-0.7 part of antioxidant, 2-3 parts of lubricant and 0.5-2 parts of organopolysiloxane coupling agent. The high-light-transmittance thermoplastic low-smoke halogen-free flame-retardant polyolefin material prepared by the invention has the advantages of environmental protection performance, heat resistance, cold resistance, cracking resistance and flame retardance, overcomes the defects of the existing material, can meet the severe condition that the light transmittance of a large-outer-diameter (d is more than 70 mm) power cable is more than or equal to 60 percent, and can also keep good mechanical performance and processing performance.
Description
Technical Field
The invention relates to the technical field of cable materials, in particular to a high-light-transmittance halogen-free flame-retardant polyolefin sheath material and a preparation method thereof.
Background
The halogen-free low-smoke characteristic and the non-dripping characteristic of the cable are particularly important in occasions with high requirements on the flame retardant characteristic of the cable, such as subways, high-rise buildings, markets, theaters, power stations, chemical factories, urban squares and the like. When a fire disaster happens, the cable is often an important pushing handle for flame propagation, the flame is slow in flame delay speed, the cable is not dripped when being burnt, the smoke quantity is small, the visibility is high, the release quantity of harmful gas is small, the time from the development of the fire disaster to the bombing is delayed to a great extent, and more time is left for personnel escape and fire fighting. There are also rare reports on halogen-free cable material products with high light transmittance, low smoke and few dripping substances, and research on the halogen-free cable material products with high light transmittance and few dripping substances is a key problem in the development of low smoke halogen-free materials in the current market.
Disclosure of Invention
In order to solve the problems, the invention provides a high-light-transmission halogen-free flame-retardant polyolefin sheath material and a preparation method thereof, and the prepared high-light-transmission thermoplastic low-smoke halogen-free flame-retardant polyolefin material has the advantages of environmental protection performance, heat resistance, cold resistance, cracking resistance and flame retardance.
The invention adopts the following technical scheme:
the high-light-transmittance halogen-free flame-retardant polyolefin sheath material is prepared from the following raw materials in parts by weight:
9-14 parts of polyethylene resin;
20-25 parts of ethylene-vinyl acetate copolymer;
10-15 parts of ethylene-octene copolymer;
5-10 parts of compatilizer;
1-2 parts of carbon black master batch;
90-100 parts of flame retardant;
3-5 parts of smoke suppressant;
3-8 parts of a shell forming agent;
0.3-0.7 part of antioxidant;
2-3 parts of a lubricant;
0.5-2 parts of organopolysiloxane coupling agent.
The polyethylene resin has a melt index of (0.8-1) g/10min at 190℃and 2.16 kg.
The ethylene-octene copolymer has a melt index of (0.9-1.1) g/10min at 190℃and 2.16 kg.
The ethylene-vinyl acetate copolymer has a melt index of (4-5.5) g/10min at 190℃and a pressure of 2.16 kg.
The compatilizer is one or a mixture of two of ethylene-octene copolymer grafted maleic anhydride and ethylene copolymer grafted maleic anhydride.
Preferably, the ethylene-octene copolymer grafted maleic anhydride has a melt index (0.15-0.45) g/10min at 190 ℃ and 2.16 kg; the melt index of the ethylene copolymer grafted maleic anhydride at 190 ℃ and 2.16kg is (0.3-0.9) g/10min.
The carbon black master batch is a mixture of carbon black and a resin carrier, wherein the content of the carbon black is 50-60wt% based on the mass of the carbon black master batch; the resin carrier is a polyethylene resin having a melt index of (18-25) g/10min at 190 ℃ and 2.16 kg.
The flame retardant is one or a mixture of two of magnesium hydroxide and aluminum hydroxide.
The smoke suppressant is any one or a mixture of two of zinc borate and nano attapulgite.
The shell forming agent is any one or a mixture of two of modified nano montmorillonite, silica micropowder and white carbon black.
The modified nano montmorillonite is obtained by mixing hexadecyl long-chain alkane and montmorillonite, wherein the mass ratio of hexadecyl long-chain alkane to montmorillonite is (0.5-1.5): 1.
the antioxidant comprises the following components in percentage by mass: 1: (0.2-0.5) dilauryl thiodipropionate, polyhydric hindered phenol and phenyl tri (2, 4-di-tert-butyl) phosphite.
The polyhydric hindered phenol is selected from one or two of AT-10 and AT-76.
The organopolysiloxane coupling agent has a kinematic viscosity of 5.0-6.0Cst at 25 ℃.
The invention also provides a preparation method of the high-light-transmittance halogen-free flame-retardant polyolefin sheath material, which comprises the following steps:
s1, putting the raw material components weighed according to the weight of the formula into an internal mixer for kneading to obtain a mixture;
and S2, extruding, granulating and molding the uniformly mixed mixture through a single screw extruder to obtain the high-light-transmittance halogen-free flame-retardant polyolefin sheath material.
The kneading temperature in the step S1 is 180-190 ℃.
The extrusion temperature in the step S2 is 120-145 ℃.
The invention also provides application of the high-light-transmittance halogen-free flame-retardant polyolefin sheath material in preparation of the power cable sheath.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the high-light-transmittance thermoplastic low-smoke halogen-free flame-retardant polyolefin material prepared by the invention has the advantages of environmental protection performance, heat resistance, cold resistance, cracking resistance and flame retardance, overcomes the defects of the existing material, can meet the severe condition that the light transmittance of a large-outer-diameter (d is more than 70 mm) power cable is more than or equal to 60 percent, and can also keep good mechanical performance and processing performance. In addition, the preparation process is simple, the equipment investment is small, the efficiency is high, and the cost is low.
Detailed Description
This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
the embodiment provides a high-light-transmission halogen-free flame-retardant polyolefin sheath material, which comprises the following components in parts by weight:
wherein the compatilizer is ethylene-octene copolymer grafted maleic anhydride and ethylene copolymer grafted maleic anhydride, and the mass ratio of the compatilizer to the ethylene-octene copolymer grafted maleic anhydride is 1:1, a mixture of two or more of the above-mentioned materials; the carbon black master batch is prepared from carbon black and a resin carrier according to a mass ratio of 1:1, wherein the resin carrier is polyethylene resin; the smoke suppressant is zinc borate; the shell forming agent is modified nano montmorillonite, the modified nano montmorillonite is obtained by mixing hexadecyl long-chain alkane and montmorillonite, wherein the mass ratio of hexadecyl long-chain alkane to montmorillonite is 0.5:1, a step of; the antioxidant comprises the following components in percentage by mass: 1:0.2 of dilauryl thiodipropionate, a polyhydric hindered phenol and tri (2, 4-di-tert-butyl) phenyl phosphite, wherein the polyhydric hindered phenol is AT-10.
The preparation method comprises the following steps:
s1, putting the raw material components weighed according to the weight of the formula into an internal mixer for kneading, and controlling the kneading temperature to be 180-190 ℃ to obtain a mixture;
s2, extruding, granulating and molding the uniformly mixed mixture through a single screw extruder, and controlling the extrusion temperature to be 120-145 ℃ to obtain the high-light-transmittance halogen-free flame-retardant polyolefin sheath material.
Example 2:
the embodiment provides a high-light-transmission halogen-free flame-retardant polyolefin sheath material, which comprises the following components in parts by weight:
wherein, the compatilizer is ethylene-octene copolymer grafted maleic anhydride; the shell forming agent is silicon micropowder and white carbon black according to the mass ratio of 1:1, a mixture of two or more of the above-mentioned materials; the carbon black master batch is prepared from carbon black and a resin carrier according to a mass ratio of 1:2, a mixture of two or more of the above-mentioned materials; the smoke suppressant is nano attapulgite; the shell forming agent is silicon micropowder and white carbon black according to the mass ratio of 1:1, a mixture of two or more of the above-mentioned materials; the antioxidant comprises the following components in percentage by mass: 1:0.5 dilauryl thiodipropionate, a polyhydric hindered phenol, and phenyl tri (2, 4-di-tert-butyl) phosphite, wherein the polyhydric hindered phenol is AT-76. The preparation method comprises the following steps:
s1, putting the raw material components weighed according to the weight of the formula into an internal mixer for kneading, and controlling the kneading temperature to be 180-190 ℃ to obtain a mixture;
s2, extruding, granulating and molding the uniformly mixed mixture through a single screw extruder, and controlling the extrusion temperature to be 120-145 ℃ to obtain the high-light-transmittance halogen-free flame-retardant polyolefin sheath material.
Example 3:
the embodiment provides a high-light-transmission halogen-free flame-retardant polyolefin sheath material, which comprises the following components in parts by weight:
wherein the compatilizer is ethylene-octene copolymer grafted maleic anhydride and ethylene copolymer grafted maleic anhydride, and the mass ratio of the compatilizer to the ethylene-octene copolymer grafted maleic anhydride is 1:1, a mixture of two or more of the above-mentioned materials; the carbon black master batch is prepared from carbon black and a resin carrier according to a mass ratio of 2:1, a mixture of two or more of the above-mentioned materials; the smoke suppressant is prepared from zinc borate and nano attapulgite according to a mass ratio of 1:1, a mixture of two or more of the above-mentioned materials; the shell forming agent is modified nano montmorillonite and white carbon black according to the mass ratio of 1:1, wherein the modified nano montmorillonite is obtained by mixing sixteen long-chain alkane and montmorillonite, and the mass ratio of the sixteen long-chain alkane to the montmorillonite is 1.5:1, a step of; the antioxidant comprises the following components in percentage by mass: 1:0.4 of dilauryl thiodipropionate, polyhydric hindered phenol and tri (2, 4-di-tert-butyl) phenyl phosphite, wherein the polyhydric hindered phenol comprises AT-10 and AT-76 according to the mass ratio of 1: 1.
The preparation method comprises the following steps:
s1, putting the raw material components weighed according to the weight of the formula into an internal mixer for kneading, and controlling the kneading temperature to be 180-190 ℃ to obtain a mixture;
s2, extruding, granulating and molding the uniformly mixed mixture through a single screw extruder, and controlling the extrusion temperature to be 120-145 ℃ to obtain the high-light-transmittance halogen-free flame-retardant polyolefin sheath material.
Comparative example 1:
in this comparative example, no smoke suppressant was used as compared with example 1, and the rest of the components were the same as in example 1, and the kneading and extrusion granulation process was the same as in example 1.
Comparative example 2:
in this comparative example, as compared with example 1, no shell-forming agent was used, and the rest of the components were the same as in example 1, and the kneading and extrusion granulation process was the same as in example 1.
Comparative example 3:
in this comparative example, as compared with example 1, no shell forming agent and smoke suppressant were used, and the rest of the components were the same as in example 1, and the kneading and extrusion granulation process was the same as in example 1.
Performance test:
the cable materials prepared according to the proportions in examples 1 to 3 and comparative examples 1 to 3 were subjected to performance tests according to the relevant standards, respectively, and the relevant performance results of the prepared cable materials are shown in Table 1.
TABLE 1 Performance test results of the cable materials prepared in examples 1-3 and comparative examples 1-3
As is evident from table 1, the smoke density of the cable sheath material and the light transmittance of the cable are greatly affected by the shell forming agent and the smoke suppressant. Under the condition that a shell forming agent and/or a smoke suppressant are not added, the flameless smoke density and the flame smoke density of the sheath material are both greatly increased, and the light transmittance is greatly reduced.
In conclusion, the high-light-transmittance thermoplastic low-smoke halogen-free flame-retardant polyolefin material prepared by the method has the advantages of taking the environmental protection performance, the heat resistance performance, the cold resistance performance, the cracking resistance performance and the flame retardance into consideration, overcoming the defects of the existing material, meeting the severe condition that the light transmittance of a large-outer-diameter (d is more than 70 mm) power cable is more than or equal to 60 percent, keeping good mechanical property and processing performance, effectively overcoming various defects in the prior art, along with simple preparation process, small equipment investment, high efficiency, low cost and high industrial utilization value.
The invention is applicable to the prior art where nothing is said.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While obvious variations or modifications are contemplated as falling within the scope of the present invention.
Claims (10)
1. The high-light-transmittance halogen-free flame-retardant polyolefin sheath material is characterized by being prepared from the following raw materials in parts by weight:
9-14 parts of polyethylene resin;
20-25 parts of ethylene-vinyl acetate copolymer;
10-15 parts of ethylene-octene copolymer;
5-10 parts of compatilizer;
1-2 parts of carbon black master batch;
90-100 parts of flame retardant;
3-5 parts of smoke suppressant;
3-8 parts of a shell forming agent;
0.3-0.7 part of antioxidant;
2-3 parts of a lubricant;
0.5-2 parts of organopolysiloxane coupling agent.
2. The high light transmission halogen-free flame retardant polyolefin sheathing compound of claim 1, wherein the polyethylene resin has a melt index of (0.8-1) g/10min at 190 ℃ and 2.16 kg; the ethylene-octene copolymer has a melt index (0.9-1.1) g/10min at 190 ℃ and 2.16 kg; the ethylene-vinyl acetate copolymer has a melt index of (4-5.5) g/10min at 190℃and a pressure of 2.16 kg.
3. The high light transmission halogen-free flame retardant polyolefin sheath material according to claim 1, wherein the compatibilizer is one or a mixture of two of ethylene-octene copolymer grafted maleic anhydride and ethylene copolymer grafted maleic anhydride.
4. The high light transmission halogen-free flame retardant polyolefin sheathing compound of claim 3, wherein the ethylene-octene copolymer grafted maleic anhydride has a melt index of (0.15-0.45) g/10min at 190 ℃ and 2.16 kg; the melt index of the ethylene copolymer grafted maleic anhydride at 190 ℃ and 2.16kg is (0.3-0.9) g/10min.
5. The high light transmission halogen-free flame retardant polyolefin sheath material according to claim 1, wherein the carbon black masterbatch is a mixture of carbon black and a resin carrier, wherein the carbon black content is 50-60wt% based on the mass of the carbon black masterbatch; the resin carrier is a polyethylene resin having a melt index of (18-25) g/10min at 190 ℃ and 2.16 kg.
6. The high light-transmitting halogen-free flame retardant polyolefin sheath material according to claim 1, wherein the flame retardant is one or a mixture of two of magnesium hydroxide and aluminum hydroxide; the smoke suppressant is any one or a mixture of two of zinc borate and nano attapulgite; the shell forming agent is any one or a mixture of two of modified nano montmorillonite, silica micropowder and white carbon black; the antioxidant comprises the following components in percentage by mass: 1: (0.2-0.5) dilauryl thiodipropionate, polyhydric hindered phenol and phenyl tri (2, 4-di-tert-butyl) phosphite.
7. The high-light-transmittance halogen-free flame-retardant polyolefin sheath material according to claim 6, wherein the modified nano montmorillonite is obtained by mixing sixteen long-chain alkane and montmorillonite, wherein the mass ratio of the sixteen long-chain alkane to the montmorillonite is (0.5-1.5): 1, a step of;
the polyhydric hindered phenol is selected from one or two of AT-10 and AT-76.
8. The high light transmission halogen-free flame retardant polyolefin sheath material according to claim 1, wherein the organopolysiloxane coupling agent has a kinematic viscosity of 5.0-6.0Cst at 25 ℃.
9. A method for preparing the high light transmission halogen-free flame retardant polyolefin sheath material according to any one of claims 1-8, comprising the following steps:
s1, putting the raw material components weighed according to the weight of the formula into an internal mixer for kneading to obtain a mixture;
and S2, extruding, granulating and molding the uniformly mixed mixture through a single screw extruder to obtain the high-light-transmittance halogen-free flame-retardant polyolefin sheath material.
10. The method according to claim 9, wherein the kneading temperature in the step S1 is 180 to 190 ℃; the extrusion temperature in the step S2 is 120-145 ℃.
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