CN113845715A - Cold-resistant low-smoke halogen-free flame-retardant ultraviolet-crosslinked polyolefin insulation material and preparation method thereof - Google Patents
Cold-resistant low-smoke halogen-free flame-retardant ultraviolet-crosslinked polyolefin insulation material and preparation method thereof Download PDFInfo
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- 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 51
- 239000003063 flame retardant Substances 0.000 title claims abstract description 50
- 229920000098 polyolefin Polymers 0.000 title claims abstract description 30
- 239000000779 smoke Substances 0.000 title claims abstract description 21
- 239000012774 insulation material Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 67
- 239000011347 resin Substances 0.000 claims abstract description 67
- 239000000155 melt Substances 0.000 claims abstract description 31
- 229920013716 polyethylene resin Polymers 0.000 claims abstract description 26
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 20
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 20
- 239000011810 insulating material Substances 0.000 claims abstract description 13
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 12
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 11
- 239000000314 lubricant Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 9
- 239000003999 initiator Substances 0.000 claims description 8
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- OKKRPWIIYQTPQF-UHFFFAOYSA-N Trimethylolpropane trimethacrylate Chemical group CC(=C)C(=O)OCC(CC)(COC(=O)C(C)=C)COC(=O)C(C)=C OKKRPWIIYQTPQF-UHFFFAOYSA-N 0.000 claims description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 3
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical group C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims description 3
- 239000012965 benzophenone Substances 0.000 claims description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 3
- 239000000347 magnesium hydroxide Substances 0.000 claims description 3
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims 6
- 238000004132 cross linking Methods 0.000 abstract description 18
- 239000002994 raw material Substances 0.000 abstract description 6
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000003504 photosensitizing agent Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000002699 waste material Substances 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
- C08L2312/06—Crosslinking by radiation
Abstract
The invention discloses a cold-resistant low-smoke halogen-free flame-retardant ultraviolet-crosslinked polyolefin insulation material which comprises the following components in parts by weight: 110-30 parts of EVA resin; 24-8 parts of EVA resin; 0-3 parts of POE resin; 5-10 parts of polyethylene resin; 45-85 parts of a flame retardant; 0.1-1.5 parts of photoinitiator; 0-1 part of auxiliary crosslinking agent; 2-6 parts of a compatilizer; 0-2 parts of a lubricant; 0-0.5 part of antioxidant; 0-0.8 part of flame-retardant auxiliary agent; wherein the melt index of the EVA resin 1 is 2-4g/10min, and the melt index of the EVA resin 2 is 6-9g/10 min. The insulating material has good cold resistance and flame retardance, high mechanical strength, good electric breakdown resistance, stable preparation process, cheap and easily-obtained raw materials, and great application space and market prospect, and a pre-crosslinking phenomenon cannot occur.
Description
Technical Field
The invention belongs to the technical field of wire and cable materials, and particularly relates to a cold-resistant low-smoke halogen-free flame-retardant ultraviolet-crosslinked polyolefin insulating material and a preparation method thereof.
Background
The halogen-free flame-retardant polyolefin material is widely applied in the field of wires and cables due to excellent flame-retardant property, low toxicity, comprehensive mechanical property and the like. In order to make the halogen-free flame-retardant polyolefin cable material have better long-term service temperature, corrosion resistance, pressure resistance, mechanical strength and the like, the crosslinking technology is widely applied to the halogen-free flame-retardant polyolefin cable material.
There are currently three main ways of polyolefin crosslinking: peroxide crosslinking, irradiation crosslinking and silane crosslinking, but the traditional crosslinking mode has complex process and higher cost; in recent years, ultraviolet crosslinking is gradually developed due to the characteristics of simple process and high production efficiency, and a three-dimensional reticular crosslinking structure is rapidly compounded by macromolecular free radicals generated in a series of photophysical and photochemical processes after a photoinitiator or photosensitizer is added into polyolefin to absorb ultraviolet light. The polyolefin material obtained by the existing ultraviolet crosslinking technology is easy to generate pre-crosslinking phenomenon, the surface of the manufactured cable is not smooth, the electric breakdown phenomenon is easy to generate, and the functionality in the aspects of cold resistance, flame retardance and the like is insufficient.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a cold-resistant low-smoke halogen-free flame-retardant ultraviolet-crosslinked polyolefin insulating material and a preparation method thereof.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a cold-resistant low-smoke halogen-free flame-retardant ultraviolet cross-linked polyolefin insulation material comprises the following components in parts by weight:
wherein the melt index of the EVA resin 1 at 190 ℃ under the condition of 2.16kg load is 2-4g/10min, and the melt index of the EVA resin 2 at 190 ℃ under the condition of 2.16kg load is 6-9g/10 min.
Further, the POE resin has a melt index of 5-9g/10min at 190 ℃ under a load of 2.16 kg; the density of the polyethylene resin is 0.910-0.925g/cm3And a melt index of 1 to 4g/10min at 190 ℃ under a load of 2.16 kg.
Preferably, the flame retardant is one or a mixture of two of aluminum hydroxide and magnesium hydroxide.
Preferably, the photoinitiator is benzophenone.
Preferably, the auxiliary crosslinking agent is trimethylolpropane trimethacrylate.
Preferably, the compatilizer consists of the following components in parts by weight: 50-300 parts of polyethylene resin, 50-150 parts of maleic anhydride and 1-5 parts of bis-penta initiator.
Preferably, the lubricant is silicone; the antioxidant is one or a mixture of AT least two of antioxidant 300, antioxidant 1076, antioxidant AT-10 and antioxidant DLTP; the flame-retardant auxiliary agent is a silane coupling agent.
The invention further provides a preparation method of the cold-resistant low-smoke halogen-free flame-retardant ultraviolet crosslinking polyolefin insulation material, which comprises the following steps:
(1) weighing EVA resin 1, EVA resin 2, POE resin, polyethylene resin, a flame retardant, a photoinitiator, an auxiliary crosslinking agent, a compatilizer, a lubricant, an antioxidant and a flame retardant auxiliary agent in proportion, and uniformly mixing in a high-speed mixer to obtain a mixture;
(2) adding the mixture obtained in the step (1) into a double-screw extruder for extrusion, then granulating, drying by a rocking roller, and finally packaging a finished product; wherein the heating temperature of the double-screw extruder is 140-220 ℃.
The invention has the beneficial effects that:
according to the invention, the photoinitiator is added into the EVA resin, the POE resin and the polyethylene resin, and after the photoinitiator absorbs ultraviolet light, macromolecular free radicals of the resin are triggered to rapidly compound to generate a three-dimensional reticular cross-linked structure, so that the ultraviolet light cross-linked polyolefin insulating material is obtained.
The resins in the invention are EVA resin, POE resin and polyethylene resin, wherein the EVA resin is two, the melt index of the EVA resin 1 is 2-4g/10min under the conditions of 190 ℃ and 2.16kg load, and the melt index of the EVA resin 2 is 6-9g/10min under the conditions of 190 ℃ and 2.16kg load; the EVA resin with high melt index and the EVA resin with low melt index are mixed, so that the melt index of the insulating material can be adjusted, and the insulating material can be ensured to have higher mechanical strength while better fluidity in the processing process of the insulating material is ensured.
The polyolefin insulating material obtained by the invention has no pre-crosslinking phenomenon, the surface of the obtained cable is smooth, the extrusion speed in the processing process is high, the better puncture resistance can be ensured, the hot elongation and hot shrinkage performance indexes of the cable have large allowance, and the extrusion and discharge waste in the production process is less.
The flame-retardant auxiliary agent can enable the flame-retardant part to be better dispersed in resin, improve the compatibility of the flame retardant and the resin and further improve the flame retardance of the insulating material.
The polyolefin insulating material can allow the conductor to have the minimum working temperature of about minus 60 ℃ for a long time, has excellent flame retardant effect, and has the characteristics of high volume resistivity, small dielectric loss, good heat and aging resistance, good stress cracking resistance, easiness in processing, low price and the like.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a cold-resistant low-smoke halogen-free flame-retardant ultraviolet-crosslinked polyolefin insulation material which comprises the following components in parts by weight:
wherein the melt index of the EVA resin 1 at 190 ℃ under the condition of 2.16kg load is 2-4g/10min, and the melt index of the EVA resin 2 at 190 ℃ under the condition of 2.16kg load is 6-9g/10 min.
Wherein, the POE resin has a melt index of 5-9g/10min at 190 ℃ under the condition of 2.16kg load; the density of the polyethylene resin is 0.910-0.925g/cm3And a melt index of 1 to 4g/10min at 190 ℃ under a load of 2.16 kg.
Wherein, the flame retardant is one or a mixture of two of aluminum hydroxide and magnesium hydroxide.
Wherein the photoinitiator is benzophenone.
Wherein the auxiliary crosslinking agent is trimethylolpropane trimethacrylate.
The compatilizer comprises the following components in parts by weight: 50-300 parts of polyethylene resin, 50-150 parts of maleic anhydride and 1-5 parts of bis-penta initiator.
Wherein the lubricant is silicone; the antioxidant is one or a mixture of AT least two of antioxidant 300, antioxidant 1076, antioxidant AT-10 and antioxidant DLTP; the flame-retardant auxiliary agent is a silane coupling agent.
The invention further provides a preparation method of the cold-resistant low-smoke halogen-free flame-retardant ultraviolet crosslinking polyolefin insulating material, which comprises the following steps:
(1) weighing EVA resin 1, EVA resin 2, POE resin, polyethylene resin, a flame retardant, a photoinitiator, an auxiliary crosslinking agent, a compatilizer, a lubricant, an antioxidant and a flame retardant auxiliary agent in proportion, and uniformly mixing in a high-speed mixer to obtain a mixture;
(2) adding the mixture obtained in the step (1) into a double-screw extruder for extrusion, then granulating, drying by a rocking roller, and finally packaging a finished product; wherein the heating temperature of the double-screw extruder is 140-220 ℃.
Example 1
The raw materials comprise the following components in parts by weight:
wherein the melt index of the EVA resin 1 at 190 ℃ under the load of 2.16kg is 2g/10min, and the melt index of the EVA resin 2 at 190 ℃ under the load of 2.16kg is 6g/10 min.
Wherein, the melt index of the POE resin is 5g/10min at 190 ℃ under the condition of 2.16kg load; the polyethylene resin had a density of 0.910g/cm3The melt index at 190 ℃ under a load of 2.16kg was 2g/10 min.
The compatilizer comprises the following components in parts by weight: 100 parts of polyethylene resin, 80 parts of maleic anhydride and 2 parts of bis-dipenta initiator.
A preparation method of a cold-resistant low-smoke halogen-free flame-retardant ultraviolet crosslinking polyolefin insulation material comprises the following steps:
(1) weighing EVA resin 1, EVA resin 2, POE resin, polyethylene resin, a flame retardant, a photoinitiator, an auxiliary crosslinking agent, a compatilizer, a lubricant, an antioxidant and a flame retardant auxiliary agent in proportion, and putting the materials into a high-speed mixer for uniformly mixing;
(2) adding the resin mixed in the step (1) into a double-screw extruder for extrusion, wherein the heating temperature of the double-screw extruder is 140-220 ℃; and then granulating, drying by a rocking roller, and finally packaging a finished product.
Example 2
The raw materials comprise the following components in parts by weight:
wherein the melt index of the EVA resin 1 at 190 ℃ under the load of 2.16kg is 3g/10min, and the melt index of the EVA resin 2 at 190 ℃ under the load of 2.16kg is 8g/10 min.
Wherein, the melt index of the POE resin is 8g/10min at 190 ℃ under the condition of 2.16kg load; the polyethylene resin had a density of 0.920g/cm3The melt index at 190 ℃ under a load of 2.16kg was 3g/10 min.
The compatilizer comprises the following components in parts by weight: 100 parts of polyethylene resin, 80 parts of maleic anhydride and 2 parts of bis-dipenta initiator.
A preparation method of a cold-resistant low-smoke halogen-free flame-retardant ultraviolet crosslinking polyolefin insulation material comprises the following steps:
(1) weighing EVA resin 1, EVA resin 2, POE resin, polyethylene resin, a flame retardant, a photoinitiator, an auxiliary crosslinking agent, a compatilizer, a lubricant, an antioxidant and a flame retardant auxiliary agent in proportion, and putting the materials into a high-speed mixer for uniformly mixing;
(2) adding the resin mixed in the step (1) into a double-screw extruder for extrusion, wherein the heating temperature of the double-screw extruder is 140-220 ℃; and then granulating, drying by a rocking roller, and finally packaging a finished product.
Example 3
The raw materials comprise the following components in parts by weight:
wherein the melt index of the EVA resin 1 at 190 ℃ under the load of 2.16kg is 2g/10min, and the melt index of the EVA resin 2 at 190 ℃ under the load of 2.16kg is 6g/10 min.
Wherein, the POE resin is at 190 ℃ and under the load of 2.16kgThe lower melt index is 5g/10 min; the polyethylene resin had a density of 0.910g/cm3The melt index at 190 ℃ under a load of 2.16kg was 2g/10 min.
The compatilizer comprises the following components in parts by weight: 100 parts of polyethylene resin, 80 parts of maleic anhydride and 2 parts of bis-dipenta initiator.
Example 4
The raw materials comprise the following components in parts by weight:
wherein the melt index of the EVA resin 1 at 190 ℃ under the load of 2.16kg is 3g/10min, and the melt index of the EVA resin 2 at 190 ℃ under the load of 2.16kg is 8g/10 min.
Wherein, the melt index of the POE resin is 8g/10min at 190 ℃ under the condition of 2.16kg load; the polyethylene resin had a density of 0.920g/cm3The melt index at 190 ℃ under a load of 2.16kg was 3g/10 min.
The compatilizer comprises the following components in parts by weight: 100 parts of polyethylene resin, 80 parts of maleic anhydride and 2 parts of bis-dipenta initiator.
A preparation method of a cold-resistant low-smoke halogen-free flame-retardant ultraviolet crosslinking polyolefin insulation material comprises the following steps:
(1) weighing EVA resin 1, EVA resin 2, POE resin, polyethylene resin, a flame retardant, a photoinitiator, an auxiliary crosslinking agent, a compatilizer, a lubricant, an antioxidant and a flame retardant auxiliary agent in proportion, and putting the materials into a high-speed mixer for uniformly mixing;
(2) adding the resin mixed in the step (1) into a double-screw extruder for extrusion, wherein the heating temperature of the double-screw extruder is 140-220 ℃; and then granulating, drying by a rocking roller, and finally packaging a finished product.
Example 5
The raw materials comprise the following components in parts by weight:
wherein the melt index of the EVA resin 1 at 190 ℃ under the load of 2.16kg is 3g/10min, and the melt index of the EVA resin 2 at 190 ℃ under the load of 2.16kg is 8g/10 min.
Wherein, the melt index of the POE resin is 8g/10min at 190 ℃ under the condition of 2.16kg load; the polyethylene resin had a density of 0.920g/cm3The melt index at 190 ℃ under a load of 2.16kg was 3g/10 min.
The compatilizer comprises the following components in parts by weight: 100 parts of polyethylene resin, 80 parts of maleic anhydride and 2 parts of bis-dipenta initiator.
A preparation method of a cold-resistant low-smoke halogen-free flame-retardant ultraviolet crosslinking polyolefin insulation material comprises the following steps:
(1) weighing EVA resin 1, EVA resin 2, POE resin, polyethylene resin, a flame retardant, a photoinitiator, an auxiliary crosslinking agent, a compatilizer, a lubricant, an antioxidant and a flame retardant auxiliary agent in proportion, and putting the materials into a high-speed mixer for uniformly mixing;
(2) adding the resin mixed in the step (1) into a double-screw extruder for extrusion, wherein the heating temperature of the double-screw extruder is 140-220 ℃; and then granulating, drying by a rocking roller, and finally packaging a finished product.
The insulation materials of examples 1 to 5 were extruded to form wires, and the resulting wires were subjected to comprehensive property tests, the property results of which are shown in table 1:
TABLE 1
As shown in Table 1, the insulating material has the advantages of high volume resistivity, small dielectric loss, good thermal aging resistance and stress cracking resistance, and has good mechanical properties.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents made by the contents of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (8)
1. The low-temperature-resistant low-smoke halogen-free flame-retardant ultraviolet-crosslinked polyolefin insulating material is characterized by comprising the following components in parts by weight:
wherein the melt index of the EVA resin 1 at 190 ℃ under the condition of 2.16kg load is 2-4g/10min, and the melt index of the EVA resin 2 at 190 ℃ under the condition of 2.16kg load is 6-9g/10 min.
2. The cold-resistant low-smoke zero-halogen flame-retardant ultraviolet-crosslinked polyolefin insulation material according to claim 1, wherein the melt index of the POE resin is 5-9g/10min at 190 ℃ under a load of 2.16 kg; the density of the polyethylene resin is 0.910-0.925g/cm3And a melt index of 1 to 4g/10min at 190 ℃ under a load of 2.16 kg.
3. The cold-resistant low-smoke zero-halogen flame-retardant ultraviolet-crosslinked polyolefin insulation material according to claim 1, characterized in that the flame retardant is one or a mixture of two of aluminum hydroxide and magnesium hydroxide.
4. The cold-resistant low-smoke zero-halogen flame-retardant ultraviolet-crosslinked polyolefin insulation material according to claim 1, wherein the photoinitiator is benzophenone.
5. The cold-resistant low-smoke zero-halogen flame-retardant ultraviolet-crosslinked polyolefin insulation material according to claim 1, characterized in that the auxiliary crosslinking agent is trimethylolpropane trimethacrylate.
6. The cold-resistant low-smoke halogen-free flame-retardant ultraviolet-crosslinked polyolefin insulation material according to claim 1, characterized in that the compatilizer is composed of the following components in parts by weight: 50-300 parts of polyethylene resin, 50-150 parts of maleic anhydride and 1-5 parts of bis-penta initiator.
7. The cold-resistant low-smoke zero-halogen flame-retardant ultraviolet-crosslinked polyolefin insulation material according to claim 1, characterized in that the lubricant is silicone; the antioxidant is one or a mixture of AT least two of antioxidant 300, antioxidant 1076, antioxidant AT-10 and antioxidant DLTP; the flame-retardant auxiliary agent is a silane coupling agent.
8. The preparation method of the cold-resistant low-smoke zero-halogen flame-retardant ultraviolet light crosslinked polyolefin insulation material as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
(1) weighing EVA resin 1, EVA resin 2, POE resin, polyethylene resin, a flame retardant, a photoinitiator, an auxiliary crosslinking agent, a compatilizer, a lubricant, an antioxidant and a flame retardant auxiliary agent in proportion, and uniformly mixing in a high-speed mixer to obtain a mixture;
(2) adding the mixture obtained in the step (1) into a double-screw extruder for extrusion, then granulating, drying by a rocking roller, and finally packaging a finished product; wherein the heating temperature of the double-screw extruder is 140-220 ℃.
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Application publication date: 20211228 |