CN108794897A - A kind of polypropylene-base high-voltage cable insulating layer material and preparation method thereof - Google Patents
A kind of polypropylene-base high-voltage cable insulating layer material and preparation method thereof Download PDFInfo
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- 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
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- 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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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08L2207/06—Properties of polyethylene
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Abstract
The invention discloses a kind of polypropylene-base high-voltage cable insulating layer materials, include according to parts by weight：40~75 parts of polypropylene base-material, 25~60 parts of elastomeric base, 0.5~4.0 part of nanometre voltage reinforcing agent, shrink 0~1.5 part of 0.3~5.0 part of uniform additive and lubrication dispersing agent at 0.5~2.5 part of antioxidant of collaboration；Wherein：The total weight number of the polypropylene base-material and the elastomeric base is 100 parts；Polypropylene base-material is the blend that homopolypropylene and copolymer polypropylene are mixed by 1 to 1~15 weight ratio, and the melt index of homopolypropylene is 1.5~3.5g/10min, 1.0~4.0g/10min of melt index of copolymer polypropylene.It has the technical effect that：Conductor current-carrying capacity can be improved or reduce sectional area, insulation thickness is thinned, energy conservation and environmental protection is recyclable.The invention also discloses the preparation methods of the polypropylene-base high-voltage cable insulating layer material.
Description
Technical field
The present invention relates to a kind of polypropylene-base high-voltage cable insulating layer materials and preparation method thereof.
Background technology
Currently, the insulating layer material that China manufactures the mesohigh AC and DC power cable of business operation is substantially adopted
With crosslinked polyethylene, it is abbreviated as XLPE.Insulating layer material of the crosslinked polyethylene as power cable, especially high-tension cable, also
There are some disadvantages：
Crosslinked polyethylene is thermosets, to be completed to cure by crosslinking process, and solidification temperature is 350 DEG C, heating consumption
Take a large amount of thermal energy.
The by-product contamination environment that chemical cross-linking agent decomposites in cross-linking process, and portion of residual is in insulating layer, it is right
The electrical property of electrical property especially direct current cables influences huge, it is necessary to be handled through subsequent technique.
Due to crosslinking, extrusion linear speed is restricted.And in production process, partial material incipient scorch can be accumulated in extruder
Object needs midway to shut down cleaning, cannot long-time continuous production.So production capacity and primary extrusion length limited.
The maximum operating temperature of crosslinked polyetylene insulated layer material is 90 DEG C, limits current-carrying capacity of cable.
The breakdown strength about 40kV/mm of the crosslinked polyethylene test piece of 1 millimeters thick of standard, so insulation thickness is limited.
Crosslinked polyethylene can not secondary operation, recycle difficult.
Invention content
The purpose of the invention is to overcome the deficiencies of the prior art and provide a kind of polypropylene-base high-voltage cable insulating layer material
Material, and preparation method thereof, conductor current-carrying capacity can be improved or reduce conductor cross sectional area, insulation thickness is thinned, energy conservation and environmental protection is recyclable
It utilizes.
Realizing a kind of technical solution of above-mentioned purpose is：A kind of polypropylene-base high-voltage cable insulating layer material, according to weight
Number includes：40~75 parts of polypropylene base-material, 25~60 parts of elastomeric base, 0.5~4.0 part of nanometre voltage reinforcing agent, collaboration
0.5~2.5 part of antioxidant shrinks 0~1.5 part of 0.3~5.0 part of uniform additive and lubrication dispersing agent；Wherein：
The total weight number of the polypropylene base-material and the elastomeric base is 100 parts；
Polypropylene base-material is the blend that homopolypropylene and copolymer polypropylene are mixed by 1 to 1~15 weight ratio, and
It is 1.5~3.5g/10min, 1.0~4.0g/10min of melt index of copolymer polypropylene to gather polyacrylic melt index.
Further, the elastomeric base is selected from least one therein：
Melt index is 1.0~3.5g/10min, density 0.87g/cm3Ethylene-octene copolymer；
Melt index is 1.0~3.5g/10min, and density is 0.86~0.88g/cm3Ethylene-butene copolymer；
EP rubbers；
Polyethylene is granulated blend with EP rubbers, and wherein polyethylene is the highly dense of 0.5~3.0g/10min of melt index
Spend polyethylene or low density polyethylene (LDPE).
Further, the molar content of the ethylene in EP rubbers is 55~70%, and the Mooney of EP rubbers is viscous
Degree 20~40.
Further, nanometre voltage reinforcing agent is silica, magnesia, alumina silicate or the silicic acid of 40~300nm of grain size
Magnesium or its arbitrary combination.
Further, collaboration antioxidant includes primary antioxidant and auxiliary antioxidant, primary antioxidant 4,4'- thiobis (6-
Tertiary butyl -3- methylphenols), auxiliary antioxidant is three [2.4- di-tert-butyl-phenyls] phosphite esters, and primary antioxidant and auxiliary are anti-
The weight ratio of oxygen agent is 1：0.1~1.0.
Further, the talcum powder, calcium carbonate, calcinated argil or its that uniform additive is 0.5~2.0 μm of grain size are shunk
Arbitrary combination.
Further, lubrication dispersing agent is the organic amide class lubrication dispersing agent that fusing point is more than 100 DEG C.
Realizing a kind of technical solution of above-mentioned purpose is：A kind of preparation side of polypropylene-base high-voltage cable insulating layer material
Method by polypropylene base-material, elastomeric base, nanometre voltage reinforcing agent, collaboration antioxidant, shrinks uniform additive and lubrication dispersion
Agent mixes, and is sent into continuous mixing unit and is kneaded, obtains polypropylene-base high-voltage cable insulating layer material.
Realizing a kind of technical solution of above-mentioned purpose is：A kind of preparation side of polypropylene-base high-voltage cable insulating layer material
Method, after first mixing elastomeric base, nanometre voltage reinforcing agent, collaboration antioxidant, the uniform additive of contraction and lubrication dispersing agent
It is sent into stepless speed regulation mixer to be kneaded, obtains rubber composition；
After again mixing rubber composition and polypropylene base-material, it is sent into continuous mixing unit and is kneaded, obtain polypropylene-base height
Voltage cable insulating layer material.
Further, the continuous mixing unit is to be kneaded reciprocating engine, parallel dual-screw extruding machine or four combinations or more
One kind in continuous mixing unit.
The technical solution for using a kind of polypropylene-base high-voltage cable insulating layer material of the present invention, according to parts by weight packet
It includes：40~75 parts of polypropylene base-material, 25~60 parts of elastomeric base, 0.5~4.0 part of nanometre voltage reinforcing agent, collaboration antioxidant
0~1.5 part of 0.5~2.5 part, 0.3~5.0 part of the uniform additive of contraction and lubrication dispersing agent；Wherein：The polypropylene base-material and
The total weight number of the elastomeric base is 100 parts；Polypropylene base-material is homopolypropylene and copolymer polypropylene by 1 to 1~
The blend of 15 weight ratio mixing, and the melt index of homopolypropylene is 1.5~3.5g/10min, copolymer polypropylene melts
Melt 1.0~4.0g/10min of index.It has the technical effect that：Conductor current-carrying capacity can be improved or reduce conductor cross sectional area, insulation is thinned
Thickness, energy conservation and environmental protection, recoverable.
The technical solution for using a kind of preparation method of polypropylene-base high-voltage cable insulating layer material of the present invention, will gather
Propylene base-material, nanometre voltage reinforcing agent, collaboration antioxidant, shrinks uniform additive and lubrication dispersing agent mixing at elastomeric base,
It is sent into continuous mixing unit to be kneaded, obtains polypropylene-base high-voltage cable insulating layer material.It can also realize above-mentioned technique effect.
The technical solution for using a kind of preparation method of polypropylene-base high-voltage cable insulating layer material of the present invention first will
It is sent into after elastomeric base, nanometre voltage reinforcing agent, collaboration antioxidant, the uniform additive of contraction and lubrication dispersing agent mixing stepless
Speed governing mixer is kneaded, and rubber composition is obtained；After again mixing rubber composition and polypropylene base-material, it is sent into continuous mixed
Mill group is kneaded, and obtains polypropylene-base high-voltage cable insulating layer material.It can also realize above-mentioned technical proposal.
Specific implementation mode
The present inventor is in order to preferably understand technical scheme of the present invention, below by specifically real
Example is applied to be described in detail：
A kind of polypropylene-base high-voltage cable insulating layer material of the present invention is formed using polypropylene and elastomer blended technology
Thermoplastic elastomer (TPE) solves polypropylene poor toughness and disadvantage fragile under low temperature, and nanometre voltage reinforcing agent has been used to improve dielectric
Intensity has been used the uniform additive of contraction to avoid generating internal stress and internal flaw, has been reached using dystectic collaboration antioxidant
150 DEG C of thermal aging temperatures are resistant to, and avoid cooperateing with antioxidant to migrate and be precipitated from material under operating temperature.One kind of the present invention
Polypropylene-base high-voltage cable insulating layer material is suitable for high voltage ac/dc cable, and Long-term service temperature reaches 110 DEG C, heat-proof aging
Temperature reaches 150 DEG C, and heat distortion temperature is more than 130 DEG C.Brittle temperature is less than -20 DEG C.
A kind of polypropylene-base high-voltage cable insulating layer material of the present invention, includes following component according to parts by weight：Poly- third
40~75 parts of alkenyl material, 25~60 parts of elastomeric base, and the total weight number of polypropylene base-material and the elastomeric base is
100 parts, 0.5~2.5 part 0.5~4.0 part of nanometre voltage reinforcing agent, collaboration of antioxidant, shrink uniform 0.3~5.0 part of additive,
0~1.5 part of lubrication dispersing agent.Wherein polypropylene base-material is the mixture of homopolypropylene and copolymer polypropylene, homopolypropylene
Weight ratio with copolymer polypropylene is 1：1~15,1.5~3.5g/10min of melt index of homopolypropylene, copolymerization poly- third
1.0~4.0g/10min of alkene melt index.
Elastomeric base is selected from ethylene-octene copolymer, ethylene-butene copolymer, EP rubbers or polyethylene and second third
One kind in rubber granulation blend or arbitrary combination.Wherein the melt index of ethylene-octene copolymer is 1.0~3.5g/
10min, density 0.87g/cm3, 1.0~3.5g/10min of melt index of ethylene-butene copolymer, density 0.86~
0.88g/cm3.Polyethylene is the high density polyethylene (HDPE) or low density polyethylene (LDPE) that melt index is 0.5~3.0g/10min.Second third
Rubber can be the EP rubbers of dynamic vulcanization, and vulcanizing agent is peroxide DCP, and the additive amount of vulcanizing agent is second third in EP rubbers
0~1.0wt.% of rubber.
The molar content of ethylene is 55~70% in EP rubbers, the Mooney viscosity 20~40 of EP rubbers, second third
Rubber can be ethylene propylene diene rubber, and the molar content of Third monomer is less than or equal to 4.7% in ethylene propylene diene rubber, molecule
Measure narrowly distributing.
Nanometre voltage reinforcing agent is nano silicon dioxide, nano magnesia, nanometer aluminium silicate, one kind in nanometer magnesium silicate
Or arbitrary combination.40~300nm of its grain size, nanometre voltage reinforcing agent can carry out surface grafting processing by organosilan.
Collaboration antioxidant is 4,4'- thiobis (6- tertiary butyl -3- methylphenols) primary antioxidant and three [2.4- di-t-butyls
Phenyl] phosphite ester auxiliary antioxidant composition.The weight ratio 1 of primary antioxidant and auxiliary antioxidant：0.1~1.0, composition
Fusing point it is higher, ensure cable operating temperature under collaboration antioxidant will not migrate and be precipitated.
It is talcum powder to shrink uniform additive, and uniformly addition is shunk in one kind in calcium carbonate, calcinated argil or arbitrary combination
The grain size of agent is 0.5~2.0 μm, and it can be that the contraction by silane surfaces grafting processing is uniformly added to shrink uniform additive
Agent.
Lubrication dispersing agent is pure organic amide class lubrication dispersing agent, and fusing point is more than 100 DEG C, such as the double oleamides of ethylene.
The invention uses advanced rubber-plastics material process equipment and production technology, includes mainly continuous mixing unit, such as mixed
The continuous mixings units such as continuous mixing unit more than refining reciprocating engine or parallel dual-screw extruding machine or four combinations directly produce
One-step technology or the two-step process that is combined with continuous mixer of stepless speed regulation mixer.
A kind of polypropylene-base high-voltage cable insulating layer material of the present invention is granulated and is squeezed out using Melt Pump voltage stabilizing, ultra-fine mistake
Filter, high-grade purification, Automatic Control technique.
A kind of polypropylene-base high-voltage cable insulating layer material of the present invention, 150~200 DEG C of the temperature of mixing, rotor or spiral shell
Bar 50~300rpm of rotating speed, mixing time 3~10 minutes.The filtering that the viscoelastic fluid formed after mixing passes through 300~400 mesh
The cooling medium of net, rotor or screw rod is deionized water, and wind is sent and air purification grade is not less than 10000, after pellet drying
Moisture is in 200ppm or less.
It is illustrated below by specific embodiment, the number in the following example is parts by weight.
Embodiment 1
Polypropylene-base high-voltage cable insulating layer material in the present embodiment includes in parts by weight：
The homopolypropylene and 40 parts of trades mark that 20 parts of trades mark are T30 are M180 copolymer polypropylene, constitute 60 parts of polypropylene
Base-material.
40 parts of trades mark as elastomeric base are the ethylene-octene copolymer of Exxon Mobil 8203.
The grain size of 0.5 part of nano silicon dioxide as nanometre voltage reinforcing agent, nano silicon dioxide is 40~300nm.
0.2 part of 4,4'- thiobis (6- tertiary butyl -3- methylphenols) and 0.1 part of conduct auxiliary as primary antioxidant is anti-
Three [2.4- di-tert-butyl-phenyls] phosphite esters of oxygen agent form 0.3 part of collaboration antioxidant, cooperate with primary antioxidant in antioxidant
Weight ratio with auxiliary antioxidant is 1 to 0.5.
The grain size of 0.3 part of talcum powder as the uniform additive of contraction, talcum powder is 0.5~2 μm.
Polypropylene base-material and elastomeric base blending form thermoplastic elastomer (TPE).
Polypropylene-base high-voltage cable insulating layer material in the present embodiment, which is kneaded in single screw rod on reciprocating engine, to carry out, single
Screw mixing reciprocating engine includes screw rod and corresponding feeding hopper and machine head port mould positioned at screw rod both ends, wherein screw slenderness ratio
25:1。
Preparation method belongs to one-step method, includes the following steps：By load weighted polypropylene base-material, elastomeric base, receive
Rice voltage reinforcing agent, collaboration antioxidant and after shrinking uniform additive mixing, from feeding hopper feeding single screw rod be kneaded reciprocating engine into
Four row's pin of row is kneaded to obtain viscoelastic fluid, and the Temperature Distribution that four row's pins are kneaded is 120 DEG C -150 DEG C -170 DEG C -190 DEG C -
190 DEG C, the rotating speed 200rpm of screw rod；Viscoelastic fluid is passed through into the strainer of 400 mesh；Viscoelastic fluid is granulated, is obtained
The pellet of polypropylene-base high-voltage cable insulating layer material；The pellet is air-dried and packed.
Embodiment 2
Polypropylene-base high-voltage cable insulating layer material in the present embodiment includes in parts by weight：
The copolymer polypropylene that 15 parts of trades mark are T30 homopolypropylene and 55 parts of trades mark are M180 constitutes 70 parts of polypropylene
Base-material.
30 parts of trades mark as elastomeric base are the ethylene-octene copolymer of Exxon Mobil 8203.
The grain size of 1.0 parts of nanometer aluminium silicates as nanometre voltage reinforcing agent, nanometer aluminium silicate is 40~300nm.
0.5 part of 4,4'- thiobis (6- tertiary butyl -3- methylphenols) and 0.5 part of conduct auxiliary as primary antioxidant is anti-
Three [2.4- di-tert-butyl-phenyls] phosphite esters of oxygen agent form 1.0 parts of collaboration antioxidant, cooperate with primary antioxidant in antioxidant
Weight ratio with auxiliary antioxidant is 1 to 1.
1.0 parts as the calcinated argil for shrinking uniform additive.The grain size of calcinated argil is 0.5~2 μm.
Polypropylene base-material and elastomeric base blending form thermoplastic elastomer (TPE).
Polypropylene-base high-voltage cable insulating layer material in the present embodiment carries out on continuous mixing unit.
Preparation method belongs to one-step method, includes the following steps：
Load weighted polypropylene base-material, elastomeric base, nanometre voltage reinforcing agent, collaboration antioxidant and contraction are uniformly added
After adding agent to mix, carries out five combination mixings from feeding hopper feeding continuous mixing unit and be kneaded, the Temperature Distribution that five combinations are kneaded is
120 DEG C -150 DEG C -170 DEG C -190 DEG C -190 DEG C -200 DEG C -200 DEG C, viscoelastic fluid is obtained, viscoelastic fluid is passed through 400
Purpose strainer, is granulated visco elastic fluids, obtains the pellet of polypropylene-base high-voltage cable insulating layer material, finally to the grain
Material is air-dried and is packed.
Embodiment 3
Polypropylene-base high-voltage cable insulating layer material in the present embodiment includes in parts by weight：
The copolymer polypropylene that the homopolypropylene and 30 parts of trades mark that 10 parts of trades mark are T30 are M180 forms 40 parts of polypropylene
Base-material.
The high density polyethylene (HDPE) that 30 parts of trades mark are 500s, the bibasic ethylene propylene rubber that 30 parts of trades mark are Exxon V722 are formed
60 parts of elastomeric bases.
The grain size of 2.0 parts of nano magnesias as nanometre voltage reinforcing agent, nano magnesia is 40~300nm.
1.1 parts of 4,4'- thiobis (6- tertiary butyl -3- methylphenols) and 0.5 part of conduct auxiliary as primary antioxidant are anti-
Three [2.4- di-tert-butyl-phenyls] phosphite esters of oxygen agent, formed 1.6 parts collaboration antioxidant, cooperate with antioxidant in primary antioxidant and
The weight ratio of auxiliary antioxidant is 1 to 0.45.
The grain size of 1.5 parts of calcinated argils as the uniform additive of contraction, calcinated argil is 0.4~2.0 μm.
The double oleamides of 0.5 part of ethylene as lubrication dispersing agent.
Preparation method belongs to two step method, includes the following steps：
One-step melting step：By elastomeric base, nanometre voltage reinforcing agent, collaboration antioxidant, shrink uniform additive and
Lubrication dispersing agent is mixed and added into stepless speed regulation mixer mixing, the rotating speed 70rpm of the rotor of stepless speed regulation mixer, temperature
150 DEG C, mixing time 4 minutes, then be granulated by single screw extrusion machine, obtain rubber composition pellet.
Two step mixing steps：After mixing by rubber composition pellet and polypropylene base-material, by automatic weighing feeding,
Into continuous mixing unit carry out five combination mixings be kneaded, five combination mixing melting temperatures be distributed as 120 DEG C -150 DEG C -170 DEG C -
190 DEG C -190 DEG C -200 DEG C -200 DEG C, the rotating speed of the rotor of continuous mixing unit is 100rpm, obtains viscoelastic fluid, then allow
The strainer that viscoelastic fluid passes through 300 mesh；Viscoelastic fluid is cooled down and is granulated, polypropylene-base high-voltage cable insulating is obtained
The pellet of layer material is finally air-dried and is packed to the pellet.
Embodiment 4
Polypropylene-base high-voltage cable insulating layer material in the present embodiment includes in parts by weight：
The copolymer polypropylene that the homopolypropylene and 55 parts of trades mark that 5 parts of trades mark are T30 are M180 forms 60 parts of polypropylene-bases
Material.
The ethylene propylene diene rubber that low density polyethylene (LDPE) that 10 parts of trades mark are DJ120,30 parts of trades mark are EP4045, constitutes 40
Part elastomeric base.
The grain size of 3.0 parts of nanometer magnesium silicates as nanometre voltage reinforcing agent, nanometer magnesium silicate is 40~300nm.
1.5 parts of 4,4'- thiobis (6- tertiary butyl -3- methylphenols) and 0.5 part of conduct auxiliary as primary antioxidant are anti-
Three [2.4- di-tert-butyl-phenyls] phosphite esters of oxygen agent form 2 parts of collaboration antioxidant, cooperate with primary antioxidant and auxiliary in antioxidant
The weight ratio of aid anti-oxidants is 1 to 0.33.
The grain size of 1.0 parts of calcium carbonate as the uniform additive of contraction, calcium carbonate is 0.4~2.0 μm.
The double oleamides of 1.0 parts of ethylenes as lubrication dispersing agent.
Preparation method belongs to two step method, includes the following steps：
One-step melting step：By elastomeric base, nanometre voltage reinforcing agent, collaboration antioxidant, shrink uniform additive and
Lubrication dispersing agent is mixed and added into stepless speed regulation mixer mixing, the rotating speed 70rpm of the rotor of stepless speed regulation mixer, temperature
150 DEG C, mixing time 4 minutes, then be granulated by single screw extrusion machine, obtain rubber composition pellet.
Two step mixing steps：After mixing by rubber composition pellet and polypropylene base-material, by automatic weighing feeding,
It being kneaded into parallel dual-screw extruding machine, the Temperature Distribution of parallel dual-screw extruding machine is 120 DEG C -150 DEG C -170 DEG C -
190 DEG C -190 DEG C -200 DEG C -200 DEG C, the draw ratio of two screw rods is 40 to 1 in parallel dual-screw extruding machine, and rotating speed is
200rpm obtains viscoelastic fluid, then viscoelastic fluid is allowed to be filtered by the strainer of 300 mesh；Viscoelastic fluid is carried out
Cooling and granulation, obtains the pellet of polypropylene-base high-voltage cable insulating layer material, finally the pellet is air-dried and packed.
Embodiment 5
Polypropylene-base high-voltage cable insulating layer material in the present embodiment includes in parts by weight：
The copolymer polypropylene that the homopolypropylene and 55 parts of trades mark that 5 parts of trades mark are T30 are M180 forms 60 parts of polypropylene-bases
Material.
The ethylene propylene diene rubber that low density polyethylene (LDPE) that 10 parts of trades mark are DJ120,30 parts of trades mark are EP4045 forms 40 parts
Elastomeric base.0.4 part of DCP as vulcanizing agent is additionally added in ethylene propylene diene rubber.
The grain size of 1.0 parts of nano magnesias as nanometre voltage reinforcing agent, nano magnesia is 40~300nm.
The grain size of 1.0 parts of calcinated argils as the uniform additive of contraction, calcinated argil is 0.5~2.0 μm.
1.5 parts of 4,4'- thiobis (6- tertiary butyl -3- methylphenols), 1.0 parts of conduct auxiliary antioxygens as primary antioxidant
Three [2.4- di-tert-butyl-phenyls] phosphite esters of agent constitute 2.5 parts of collaboration antioxidant.Cooperate with antioxidant in primary antioxidant and
The weight ratio of auxiliary antioxidant is 1 to 0.67.
The double oleamides of 1.5 parts of ethylenes as lubrication dispersing agent.
Preparation method belongs to two step method, includes the following steps：
One-step melting step：Stepless speed regulation mixer is added in ethylene propylene diene rubber and DCP, is kneaded 3 minutes, stepless speed regulation
The rotating speed 70rpm of closed-smelting machine rotor, 150 DEG C of temperature in stepless speed regulation mixer, then by nanometre voltage reinforcing agent, collaboration antioxygen
Uniform additive and lubrication dispersing agent addition stepless speed regulation mixer are shunk in agent, continue to be kneaded 3 minutes.Then it is squeezed with single screw rod
Go out machine granulation, obtains rubber composition pellet.
Two step mixing steps：After mixing by rubber composition pellet, polypropylene base-material and low density polyethylene (LDPE), pass through
Automatic weighing feeding is added parallel dual-screw extruding machine and is kneaded, and the Temperature Distribution of parallel dual-screw extruding machine is 120 DEG C-
150 DEG C -170 DEG C -190 DEG C -190 DEG C -200 DEG C -200 DEG C, the draw ratio of two screw rods of parallel dual-screw extruding machine is 40 ratios
1, rotating speed is 200rpm, obtains viscoelastic fluid, then viscoelastic fluid is allowed to be filtered by the strainer of 300 mesh；To viscoelastic
Property fluid cooled down and be granulated, obtain the pellet of polypropylene-base high-voltage cable insulating layer material, finally to the pellet carry out
It air-dries and packs.
The polypropylene-base high-voltage cable insulating layer material in embodiment 1 to embodiment 5 is tested below, wherein thermal change
Shape experiment is using method, test piece diameter or length of side 12mm, thickness 1.25mm, the column indenter indentation diameter as defined in GB/T8815
3.15mm, load 3.50N observe the variation of thickness after being subjected to loading in one hour under test temperature.
1 Examples 1 to 5 performance comparison table of table
A kind of polypropylene-base high-voltage cable insulating layer material of the present invention can replace crosslinked polyethylene for 220kV and following
The insulating layer of extra-high-tension cable, but not limited to this.It can also be used for the insulating layer of superhigh voltage DC cable.
A kind of polypropylene-base high-voltage cable insulating layer material of the present invention has better mechanicalness compared to crosslinked polyethylene
Energy, electric property and heat resistance etc..Long-term service temperature is not less than 110 DEG C, improves 20 DEG C than crosslinked polyethylene, meets 150
DEG C high Hygrothermal Aging requirement, heat distortion temperature are more than 130 DEG C, and conductor current-carrying capacity can be improved or reduce conductor cross sectional area, be thinned exhausted
Edge thickness substantially reduces a kind of polypropylene-base high-voltage cable insulating layer material of the cable entirety raw material usage present invention, is not required to
Crosslinking process only needs general plastic extruding forming, extrusion linear speed that can faster generate, can continuously give birth to without incipient scorch object
Production, it is simple for process, be conducive to improve production capacity, greatly reduce the shutdown clearing times of extruder, production efficiency is high, without by-product
Object does not need degasification technique, and free from environmental pollution, electrical property is more preferable, and production is more simplified, it is easier to it recycles, it is environmentally protective, and it is close
Degree is light, and cheap, simple production process, material and cables manufacturing are at low cost, so having good economic and social benefit.
Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate the present invention,
And be not used as limitation of the invention, as long as in the spirit of the present invention, the change to embodiment described above
Change, modification will all be fallen within the scope of claims of the present invention.
Claims (10)
1. a kind of polypropylene-base high-voltage cable insulating layer material, it is characterised in that：Include according to parts by weight：Polypropylene base-material 40
~75 parts, 25~60 parts of elastomeric base, 0.5~4.0 part of nanometre voltage reinforcing agent, are shunk 0.5~2.5 part of antioxidant of collaboration
0~1.5 part of 0.3~5.0 part of uniform additive and lubrication dispersing agent；Wherein：
The total weight number of the polypropylene base-material and the elastomeric base is 100 parts；
Polypropylene base-material is the blend that homopolypropylene and copolymer polypropylene are mixed by 1 to 1~15 weight ratio, and homopolymerization is poly-
The melt index of propylene is 1.5~3.5g/10min, 1.0~4.0g/10min of melt index of copolymer polypropylene.
2. a kind of polypropylene-base high-voltage cable insulating layer material according to claim 1, it is characterised in that：
The elastomeric base is selected from least one therein：
Melt index is 1.0~3.5g/10min, density 0.87g/cm3Ethylene-octene copolymer；
Melt index is 1.0~3.5g/10min, and density is 0.86~0.88g/cm3Ethylene-butene copolymer；
EP rubbers；
Polyethylene is granulated blend with EP rubbers, and the high density that wherein polyethylene is 0.5~3.0g/10min of melt index is poly-
Ethylene or low density polyethylene (LDPE).
3. a kind of polypropylene-base high-voltage cable insulating layer material according to claim 2, it is characterised in that：In EP rubbers
Ethylene molar content be 55~70%, the Mooney viscosity 20~40 of EP rubbers.
4. a kind of polypropylene-base high-voltage cable insulating layer material according to claim 1, it is characterised in that：Nanometre voltage increases
Silica, magnesia, alumina silicate, magnesium silicate or the arbitrary combination that strong agent is 40~300nm of grain size.
5. a kind of polypropylene-base high-voltage cable insulating layer material according to claim 1, it is characterised in that：Cooperate with antioxidant
Including primary antioxidant and auxiliary antioxidant, primary antioxidant 4,4'- thiobis (6- tertiary butyl -3- methylphenols) assists antioxygen
Agent is three [2.4- di-tert-butyl-phenyls] phosphite esters, and the weight ratio of primary antioxidant and auxiliary antioxidant is 1：0.1~1.0.
6. a kind of polypropylene-base high-voltage cable insulating layer material according to claim 1, it is characterised in that：Contraction uniformly adds
It is talcum powder, calcium carbonate, the calcinated argil of 0.5~2.0 μm of grain size, or arbitrary combination to add agent.
7. a kind of polypropylene-base high-voltage cable insulating layer material according to claim 1, it is characterised in that：Lubrication dispersing agent
It is more than 100 DEG C of organic amide class lubrication dispersing agent for fusing point.
8. a kind of preparation method of polypropylene-base high-voltage cable insulating layer material, it is characterised in that：By polypropylene base-material, elastomer
Base-material, collaboration antioxidant, shrinks uniform additive and lubrication dispersing agent mixing at nanometre voltage reinforcing agent, is sent into continuous mixer
Group is kneaded, and obtains polypropylene-base high-voltage cable insulating layer material.
9. a kind of preparation method of polypropylene-base high-voltage cable insulating layer material, it is characterised in that：First by elastomeric base, nanometer
Voltage reinforcing agent, collaboration antioxidant are sent into the progress of stepless speed regulation mixer after shrinking uniform additive and lubrication dispersing agent mixing
It is kneaded, obtains rubber composition；
After again mixing rubber composition and polypropylene base-material, it is sent into continuous mixing unit and is kneaded, obtain polypropylene-base high-voltage electricity
Cable insulating layer material.
10. a kind of preparation method of polypropylene-base high-voltage cable insulating layer material according to claim 9, feature exist
In：The continuous mixing unit is to be kneaded in the continuous mixing unit of reciprocating engine, parallel dual-screw extruding machine or four combinations or more
One kind.
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| CN116199978A (en) * | 2023-02-21 | 2023-06-02 | 上海至正新材料有限公司 | Low-shrinkage thermoplastic polypropylene insulating material for medium-voltage cable and preparation method thereof |
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Application publication date: 20181113 |