CN113480795A - Low-smoke halogen-free flame-retardant polyethylene sheath material and preparation method thereof - Google Patents
Low-smoke halogen-free flame-retardant polyethylene sheath material and preparation method thereof Download PDFInfo
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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
- C08L23/06—Polyethene
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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- 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
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- 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
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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
- C08L2201/02—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
- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
Abstract
The invention relates to a low-smoke halogen-free flame-retardant polyethylene sheath material and a preparation method thereof, belonging to the technical field of flame-retardant polyethylene wire and cable sheath materials; the sheath material comprises the following components in parts by weight: 30-50 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 10-20 parts of ethylene-octene copolymer, 10-20 parts of compatilizer, 1-5 parts of coupling agent, 90-150 parts of aluminum hydroxide, 30-60 parts of magnesium hydroxide, 20-40 parts of flame retardant auxiliary agent, 5-15 parts of processing aid, 5-10 parts of anti-dripping agent, 3-8 parts of thermoplastic polyester elastomer, 2-5 parts of pigment carbon black, 1-4 parts of antioxidant, 2-5 parts of smoke suppressor and 0.5-1.5 parts of ultraviolet absorbent. The low-smoke halogen-free flame-retardant polyethylene sheath material prepared by the invention has excellent flame retardance, mechanical property, aging resistance, cracking resistance and high-temperature pressure property, the extruded surface is smooth, the shrinkage resistance is good, and the low-smoke halogen-free flame-retardant polyethylene sheath material can be used as an outer sheath of a power cable.
Description
Technical Field
The invention mainly relates to the field of flame-retardant polyethylene cable materials, in particular to a low-smoke halogen-free flame-retardant polyethylene sheath material and a preparation method thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Polyethylene materials have excellent electrical insulation, low temperature resistance, mechanical properties, and excellent chemical stability and dielectric properties, are easy to process and mold, and are widely used for manufacturing wire and cable insulation materials and sheath materials. The flame retardant modified polypropylene material is easy to burn, continues to burn after leaving fire, and has an oxygen index of only 17.4, so that the flame retardant modified polypropylene material is of particular significance. The flame-retardant modification of polyethylene can be realized by adding a large amount of flame retardant, but the method can obviously reduce the mechanical property of the cable material, so that the cable is influenced by stress and bending in the laying and using process, the sheath layer is easy to crack, the service performance and the service life of the cable are influenced, and hidden troubles are caused to the safe and stable operation of the cable. At present, the flame-retardant polyethylene cable sheath material in the market cannot simultaneously give consideration to high flame retardance, excellent mechanical property and cracking resistance.
Disclosure of Invention
In order to overcome the problems, the invention aims to provide a low-smoke halogen-free flame-retardant polyethylene sheath material and a preparation method thereof. The low-smoke halogen-free flame-retardant polyethylene sheath material prepared by the invention has excellent flame retardance, mechanical property, aging resistance, cracking resistance and high-temperature pressure performance, and has smooth extrusion surface and good shrinkage resistance.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention provides a low-smoke halogen-free flame-retardant polyethylene sheath material, which comprises the following raw materials in parts by weight: 30-50 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 10-20 parts of ethylene-octene copolymer, 10-20 parts of compatilizer, 1-5 parts of coupling agent, 90-150 parts of aluminum hydroxide, 30-60 parts of magnesium hydroxide, 20-40 parts of flame retardant auxiliary agent, 5-15 parts of processing aid, 5-10 parts of anti-dripping agent, 3-8 parts of thermoplastic polyester elastomer, 2-5 parts of pigment carbon black, 1-4 parts of antioxidant, 2-5 parts of smoke suppressor and 0.5-1.5 parts of ultraviolet absorbent.
In order to realize the consideration and balance of the flame retardance, the mechanical property and the anti-cracking property of the flame-retardant polyethylene cable sheath material, the invention carries out systematic research and experimental investigation on the influence of the formula of the sheath material, the interaction relation among different raw materials and the interaction relation among the materials on the performance to discover that: the combination of aluminum hydroxide, magnesium hydroxide, flame-retardant auxiliary agent, anti-dripping agent and smoke suppressor endows the sheathing material with excellent flame-retardant and low-smoke performance; the material has excellent mechanical properties due to the coordination of high-density polyethylene, linear low-density polyethylene, ethylene-octene copolymer and compatilizer and the activation of the coupling agent on the powder; the reasonable combination of the thermoplastic polyester elastomer, the high-density polyethylene, the linear low-density polyethylene and the ethylene-octene copolymer resin with different melting points endows the material with excellent crack resistance.
The second aspect of the invention provides a preparation method of a low-smoke halogen-free flame-retardant polyethylene sheath material, which comprises the following steps:
uniformly mixing high-density polyethylene, linear low-density polyethylene, ethylene-octene copolymer, compatilizer, coupling agent, aluminum hydroxide, magnesium hydroxide, flame retardant aid, processing aid, anti-dripping agent, thermoplastic polyester elastomer, antioxidant and smoke suppressor to obtain a mixture;
melting and mixing the mixture, adding the ultraviolet absorber and the pigment carbon black after the mixture is mixed and agglomerated, and continuously mixing to form a uniformly mixed rubber material;
and extruding and granulating the rubber material to obtain the low-smoke halogen-free flame-retardant polyethylene sheath material.
The invention also provides a preparation method of the low-smoke halogen-free flame-retardant polyethylene sheath material.
The invention has the beneficial effects that:
(1) the low-smoke halogen-free flame-retardant polyethylene sheath material disclosed by the invention has excellent mechanical properties, the tensile strength is more than 13MPa, and the elongation at break is more than 420%.
(2) The low-smoke halogen-free flame-retardant polyethylene sheath material has excellent flame retardant property and oxygen index of 36, and a cable produced by the material can meet A-class bundled combustion, and has no halogen generation and low smoke density in the combustion process.
(3) The low-smoke halogen-free flame-retardant polyethylene sheath material has excellent anti-cracking performance, and does not crack for at least 1h under the condition of load of 7kg in the environment of 150 ℃.
(4) The method has the advantages of simple operation method, low cost, universality and easy large-scale production.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
As described in the background, the flame-retardant modification of polyethylene materials is of particular importance because they are readily combustible and continue to burn after leaving the fire, with an oxygen index of only 17.4. The flame-retardant modification of polyethylene can be realized by adding a large amount of flame retardant, but the method can obviously reduce the mechanical property of the cable material, so that the cable is influenced by stress and bending in the laying and using process, the sheath layer is easy to crack, the service performance and the service life of the cable are influenced, and hidden troubles are caused to the safe and stable operation of the cable. Therefore, the invention provides a low-smoke halogen-free flame-retardant polyethylene sheath material and a preparation method thereof, wherein the sheath material comprises the following components in parts by weight: 30-50 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 10-20 parts of ethylene-octene copolymer, 10-20 parts of compatilizer, 1-5 parts of coupling agent, 90-150 parts of aluminum hydroxide, 30-60 parts of magnesium hydroxide, 20-40 parts of flame retardant auxiliary agent, 5-15 parts of processing aid, 5-10 parts of anti-dripping agent, 3-8 parts of thermoplastic polyester elastomer, 2-5 parts of pigment carbon black, 1-4 parts of antioxidant, 2-5 parts of smoke suppressor and 0.5-1.5 parts of ultraviolet absorbent.
In some embodiments, the high density polyethylene has a melt flow rate of 0.5 to 1.0 g/min.
In some embodiments, the linear low density polyethylene has a melt flow rate of 0.5 to 5.0 g/min.
In some embodiments, the ethylene-octene copolymer has a melt flow rate of 1.0-5.0 g/min.
In some embodiments, the compatibilizer is one or both of polyethylene grafted maleic anhydride, ethylene-octene copolymer grafted maleic anhydride.
In some embodiments, the polyethylene grafted maleic anhydride, ethylene-octene copolymer grafted maleic anhydride, has a grafting ratio of 0.7% to 1.5%.
In some embodiments, the coupling agent is one or more of vinyltris (β -methoxyethoxy) silane, vinyltriethoxysilane, isopropyltris (dioctylpyrophosphate) titanate.
In some embodiments, the particle size of the aluminum hydroxide and the particle size of the magnesium hydroxide are both 5000 meshes and above.
In some embodiments, the flame retardant aid is one or both of zinc borate, melamine cyanurate.
In some embodiments, the processing aid is one or more of silica gel, silicone masterbatch, octadecylamine, and EBS.
In some embodiments, the silicone masterbatch is a polyethylene carrier with a silicone content of 50%.
In some embodiments, the anti-drip agent is one or more of nylon, aluminum diethylphosphinate, phenolic resin.
In some embodiments, the nylon is a terpolymer nylon having a melting point of 150 ℃ to 170 ℃.
In some embodiments, the thermoplastic polyester elastomer has a melt flow rate of 4 to 10g/min and a melting point of 150 ℃ to 170 ℃.
In some embodiments, the pigment carbon black is one or two of N330, M717, E570.
In some embodiments, the antioxidant is one or more of antioxidant 1010, antioxidant 168, antioxidant 330, antioxidant 412s, antioxidant AO-80.
In some embodiments, the smoke suppressant is one or both of ammonium octamolybdate and zinc stannate.
In some embodiments, the ultraviolet light absorber is one or both of UV-9, UV-531, UV-329, and UV-326.
The preparation method of the low-smoke halogen-free flame-retardant polyethylene sheath material comprises the following steps:
(1) adding all raw materials except the ultraviolet light absorbent and the pigment carbon black into a high-speed stirrer, and stirring for 6 minutes at the temperature of 50 ℃;
(2) discharging the uniformly stirred raw materials into an internal mixer for melting and mixing;
(3) after the raw materials in the internal mixer are mixed into a mass, putting the ultraviolet light absorber and the pigment carbon black into the internal mixer for continuous mixing;
(4) when the raw materials are mixed and agglomerated again and become uniform black, continuously pressurizing and mixing for 3 minutes;
(5) discharging the uniformly mixed rubber material into a double-cone feeding port, and performing extrusion granulation by using a double-screw extruder, a single-screw extruder and a granulator to obtain the low-smoke halogen-free flame-retardant polyethylene sheath material;
(6) wherein the temperature of the double cones is set to be 130 ℃, the temperature of each section of the double-screw extruder is respectively 140 ℃, 145 ℃, 150 ℃, 155 ℃, 160 ℃, 165 ℃ and 170 ℃, the temperature of each section of the single-screw extruder is respectively 165 ℃, 170 ℃ and 170 ℃, and the temperature of the granulating machine head is 170 ℃.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1
1. The formula of the low-smoke halogen-free flame-retardant polyethylene sheath material comprises the following components: 50 parts of high-density polyethylene, 20 parts of linear low-density polyethylene, 10 parts of ethylene-octene copolymer, 20 parts of polyethylene grafted maleic anhydride, 3 parts of vinyl tri (beta-methoxyethoxy) silane, 150 parts of aluminum hydroxide, 30 parts of magnesium hydroxide, 20 parts of zinc borate, 10 parts of silicone master batch, 5 parts of EBS (ethylene bis stearamide), 10 parts of nylon, 3 parts of thermoplastic polyester elastomer, 5 parts of N3305 parts, 10101 parts of antioxidant, 1683 parts of antioxidant, 3 parts of ammonium octamolybdate, 90.5 parts of UV-90, and 5311 parts of UV-5311.
In this example, the grafting ratio of the polyethylene grafted maleic anhydride was 0.7%.
2. A preparation method of a low-smoke halogen-free flame-retardant polyethylene sheath material specifically comprises the following steps:
(1) adding all raw materials except the ultraviolet absorbent and the pigment carbon black into a high-speed stirrer, and stirring at the temperature of 50 ℃ for 6 minutes at the rotating speed of 60 revolutions per minute;
(2) discharging the uniformly stirred raw materials into an internal mixer for melting and mixing; the heating temperature of the internal mixer is 110 ℃, the pressure is 0.5MPa, and the time is mixing until the rubber material is agglomerated;
(3) after the raw materials in the internal mixer are mixed into a mass, putting the ultraviolet light absorber and the pigment carbon black into the internal mixer for continuous mixing;
(4) when the raw materials are mixed and agglomerated again and become uniform black, continuously pressurizing and mixing for 3 minutes, wherein the pressure is 0.5MPa, and discharging rubber when the temperature of the rubber reaches 140 ℃;
(5) discharging the uniformly mixed rubber material into a double-cone feeding port, and performing extrusion granulation by using a double-screw extruder, a single-screw extruder and a granulator to obtain the low-smoke halogen-free flame-retardant polyethylene sheath material;
(6) wherein the temperature of the double cones is set to be 130 ℃, the temperature of each section of the double-screw extruder is respectively 140 ℃, 145 ℃, 150 ℃, 155 ℃, 160 ℃, 165 ℃ and 170 ℃, the temperature of each section of the single-screw extruder is respectively 165 ℃, 170 ℃ and 170 ℃, and the temperature of the granulating machine head is 170 ℃.
Example 2
1. The formula of the low-smoke halogen-free flame-retardant polyethylene sheath material comprises the following components: 40 parts of high-density polyethylene, 20 parts of linear low-density polyethylene, 10 parts of ethylene-octene copolymer, 15 parts of ethylene-octene copolymer grafted maleic anhydride, 3 parts of vinyl triethoxysilane, 90 parts of aluminum hydroxide, 60 parts of magnesium hydroxide, 40 parts of zinc borate, 5 parts of silicone master batch, 5 parts of octadecylamine, 10 parts of aluminum diethylphosphinate, 5 parts of thermoplastic polyester elastomer, N3302 parts, M7172 parts, 1682 parts of antioxidant, 3302 parts of antioxidant, 2 parts of ammonium octamolybdate, 2 parts of zinc stannate and UV-3291.5 parts.
In this example, the grafting ratio of the ethylene-octene copolymer grafted with maleic anhydride was 1.0%.
2. The preparation method is the same as example 1.
Example 3
1. The formula of the low-smoke halogen-free flame-retardant polyethylene sheath material comprises the following components: 45 parts of high-density polyethylene, 25 parts of linear low-density polyethylene, 10 parts of ethylene-octene copolymer, 10 parts of polyethylene grafted maleic anhydride, 10 parts of ethylene-octene copolymer grafted maleic anhydride, 1 part of vinyl triethoxysilane, 3 parts of isopropyl tri (dioctyl pyrophosphato acyloxy) titanate, 100 parts of aluminum hydroxide, 50 parts of magnesium hydroxide, 30 parts of melamine cyanurate, 8 parts of EBS, 5 parts of phenolic resin, 8 parts of thermoplastic polyester elastomer, N3302 parts, E5703 parts, 3 parts of antioxidant 412s, 5 parts of zinc stannate and UV-3261 parts.
Wherein the grafting rates of the polyethylene grafted maleic anhydride and the ethylene-octene copolymer grafted maleic anhydride are respectively 0.7% and 1.5%.
2. The preparation method is the same as example 1.
Example 4
1. The formula of the low-smoke halogen-free flame-retardant polyethylene sheath material comprises the following components: 40 parts of high-density polyethylene, 20 parts of linear low-density polyethylene, 10 parts of ethylene-octene copolymer, 16 parts of ethylene-octene copolymer grafted maleic anhydride, 2 parts of vinyl tri (beta-methoxyethoxy) silane, 2 parts of isopropyl tri (dioctyl pyrophosphoryl acyloxy) titanate, 120 parts of aluminum hydroxide, 40 parts of magnesium hydroxide, 30 parts of melamine cyanurate, 6 parts of silicone master batch, 6 parts of EBS, 5 parts of nylon, 5 parts of diethyl aluminum phosphinate, 7 parts of thermoplastic polyester elastomer, 7 parts of E5704 parts of antioxidant AO-801, 1682 parts of antioxidant, 3 parts of ammonium octamolybdate, UV-5310.75 parts and UV-3290.75 parts.
Wherein the grafting rate of the ethylene-octene copolymer grafted with maleic anhydride is 1.2%.
2. The preparation method is the same as example 1.
Example 5
1. The formula of the low-smoke halogen-free flame-retardant polyethylene sheath material comprises the following components: 35 parts of high-density polyethylene, 25 parts of linear low-density polyethylene, 15 parts of ethylene-octene copolymer, 12 parts of ethylene-octene copolymer grafted maleic anhydride, 2 parts of vinyl triethoxysilane, 3 parts of isopropyl tri (dioctyl pyrophosphato acyloxy) titanate, 130 parts of aluminum hydroxide, 30 parts of magnesium hydroxide, 20 parts of zinc borate, 20 parts of melamine cyanurate, 10 parts of octadecylamine, 5 parts of nylon, 5 parts of phenolic resin, 6 parts of thermoplastic polyester elastomer, M7173 parts, AO-804 parts of antioxidant, 4 parts of ammonium octamolybdate, UV-90.75 parts and UV-3260.75 parts.
Wherein the grafting rate of the ethylene-octene copolymer grafted with maleic anhydride is 1.5%.
2. The preparation method is the same as example 1.
Example 6
1. The formula of the low-smoke halogen-free flame-retardant polyethylene sheath material comprises the following components: 30 parts of high-density polyethylene, 30 parts of linear low-density polyethylene, 20 parts of ethylene-octene copolymer, 10 parts of polyethylene grafted maleic anhydride, 1 part of vinyl tri (beta-methoxyethoxy) silane, 4 parts of isopropyl tri (dioctyl pyrophosphato acyloxy) titanate, 140 parts of aluminum hydroxide, 30 parts of magnesium hydroxide, 20 parts of zinc borate, 5 parts of silica gel, 5 parts of phenolic resin, 4 parts of thermoplastic polyester elastomer, 4 parts of E5704 parts of antioxidant 3304 parts, 5 parts of ammonium octamolybdate, UV-3290.75 parts and UV-3260.75 parts.
Wherein the grafting rate of the polyethylene grafted maleic anhydride is 1.5%.
2. The preparation method is the same as example 1.
The technical parameters of the low-smoke halogen-free flame-retardant polyethylene sheath material prepared in the embodiment (1-6) are shown in table 1:
TABLE 1 Performance of low-smoke halogen-free flame-retardant polyethylene sheathing compound
As can be seen from Table 1, the low-smoke halogen-free flame-retardant polyethylene sheath material prepared by the invention has excellent flame retardance, mechanical properties, aging resistance, cracking resistance and high-temperature pressure resistance, and has smooth extrusion surface and good shrinkage resistance.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The low-smoke halogen-free flame-retardant polyethylene sheath material is characterized by comprising the following raw materials in parts by weight: 30-50 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 10-20 parts of ethylene-octene copolymer, 10-20 parts of compatilizer, 1-5 parts of coupling agent, 90-150 parts of aluminum hydroxide, 30-60 parts of magnesium hydroxide, 20-40 parts of flame retardant auxiliary agent, 5-15 parts of processing aid, 5-10 parts of anti-dripping agent, 3-8 parts of thermoplastic polyester elastomer, 2-5 parts of pigment carbon black, 1-4 parts of antioxidant, 2-5 parts of smoke suppressor and 0.5-1.5 parts of ultraviolet absorbent.
2. The sheath material of low smoke zero halogen flame retardant polyethylene according to claim 1, wherein the melt flow rate of the high density polyethylene is 0.5-1.0 g/min;
or, the linear low density polyethylene has a melt flow rate of 0.5 to 5.0 g/min;
or, the melt flow rate of the ethylene-octene copolymer is 1.0-5.0 g/min.
3. The sheath material of low-smoke halogen-free flame-retardant polyethylene according to claim 1, wherein the compatibilizer is one or two of polyethylene grafted maleic anhydride and ethylene-octene copolymer grafted maleic anhydride, and preferably, the grafting ratio of the polyethylene grafted maleic anhydride and the ethylene-octene copolymer grafted maleic anhydride is 0.7-1.5%.
4. The low-smoke zero-halogen flame-retardant polyethylene sheath material as claimed in claim 1, wherein the coupling agent is one or more of vinyltris (β -methoxyethoxy) silane, vinyltriethoxysilane, isopropyltris (dioctylpyrophosphate) titanate.
5. The low-smoke halogen-free flame-retardant polyethylene sheath material of claim 1, wherein the particle sizes of the aluminum hydroxide and the magnesium hydroxide are both 5000 meshes or more.
6. The low-smoke halogen-free flame-retardant polyethylene sheath material as claimed in claim 1, wherein the flame-retardant auxiliary agent is one or two of zinc borate and melamine cyanurate;
or the processing aid is one or more of silica gel, silicone master batch, octadecylamine and EBS;
or the anti-dripping agent is one or more of nylon, aluminum diethylphosphinate and phenolic resin;
or the antioxidant is one or more of antioxidant 1010, antioxidant 168, antioxidant 330, antioxidant 412s and antioxidant AO-80;
or the smoke suppressor is one or two of ammonium octamolybdate and zinc stannate;
or the ultraviolet absorbent is one or two of UV-9, UV-531, UV-329 and UV-326.
7. The low-smoke halogen-free flame-retardant polyethylene sheath material of claim 1, wherein the silicone master batch is a polyethylene carrier, and the silicone content is 50%;
or the nylon is ternary copolymer nylon with the melting point of 150-170 ℃;
or the melt flow rate of the thermoplastic polyester elastomer is 4-10g/min, and the melting point is 150-170 ℃;
or the pigment carbon black is one or two of N330, M717 and E570.
8. A preparation method of a low-smoke halogen-free flame-retardant polyethylene sheath material is characterized by comprising the following steps:
uniformly mixing high-density polyethylene, linear low-density polyethylene, ethylene-octene copolymer, compatilizer, coupling agent, aluminum hydroxide, magnesium hydroxide, flame retardant aid, processing aid, anti-dripping agent, thermoplastic polyester elastomer, antioxidant and smoke suppressor to obtain a mixture;
melting and mixing the mixture, adding the ultraviolet absorber and the pigment carbon black after the mixture is mixed and agglomerated, and continuously mixing to form a uniformly mixed rubber material;
and extruding and granulating the rubber material to obtain the low-smoke halogen-free flame-retardant polyethylene sheath material.
9. The method for preparing the low-smoke halogen-free flame-retardant polyethylene sheath material as claimed in claim 8, wherein the temperature of the double cone is set to 130 ℃, the temperature of each section of the double-screw extruder is 140 ℃, 145 ℃, 150 ℃, 155 ℃, 160 ℃, 165 ℃ and 170 ℃, the temperature of each section of the single-screw extruder is 165 ℃, 170 ℃ and the temperature of the pelletizing machine head is 170 ℃.
10. The use of the low-smoke halogen-free flame-retardant polyethylene sheath material of any one of claims 1 to 7 in the fields of communication and building materials.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114437410A (en) * | 2021-12-30 | 2022-05-06 | 广东宇星阻燃新材股份有限公司 | Preparation method of microencapsulated tin acetylacetonate and application of microencapsulated tin acetylacetonate in waterproof halogen-free flame retardant material |
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| CN114316418A (en) * | 2021-12-09 | 2022-04-12 | 成都金发科技新材料有限公司 | Low-shrinkage flame-retardant polyethylene composition, and preparation method and application thereof |
| CN114437410A (en) * | 2021-12-30 | 2022-05-06 | 广东宇星阻燃新材股份有限公司 | Preparation method of microencapsulated tin acetylacetonate and application of microencapsulated tin acetylacetonate in waterproof halogen-free flame retardant material |
| CN114437410B (en) * | 2021-12-30 | 2023-05-23 | 广东宇星阻燃新材股份有限公司 | Preparation method of microencapsulated tin acetylacetonate and application of microencapsulated tin acetylacetonate in water-resistant halogen-free flame-retardant material |
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| CN115197489A (en) * | 2022-06-10 | 2022-10-18 | 深圳市沃尔核材股份有限公司 | Wire and cable material and preparation method thereof |
| CN115197489B (en) * | 2022-06-10 | 2023-12-12 | 深圳市沃尔核材股份有限公司 | Wire and cable material and preparation method thereof |
| CN114989520A (en) * | 2022-07-06 | 2022-09-02 | 无锡杰科新材料有限公司 | Thermoplastic low-smoke halogen-free high-flame-retardant polyolefin sheath material for bunched optical cable and preparation method thereof |
| CN116199959A (en) * | 2022-12-02 | 2023-06-02 | 中广核拓普（湖北）新材料有限公司 | Flame-retardant polyethylene sheath material and preparation method thereof |
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| CN116063767B (en) * | 2023-03-11 | 2023-10-10 | 广东安拓普聚合物科技有限公司 | Mining scratch-resistant sheath material |
| CN116063767A (en) * | 2023-03-11 | 2023-05-05 | 广东安拓普聚合物科技有限公司 | Mining scratch-resistant sheath material |
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