CN103804759A - Post-processing process for cross-linked polyethylene insulated sheathing material for cables - Google Patents
Post-processing process for cross-linked polyethylene insulated sheathing material for cables Download PDFInfo
- Publication number
- CN103804759A CN103804759A CN201410060183.6A CN201410060183A CN103804759A CN 103804759 A CN103804759 A CN 103804759A CN 201410060183 A CN201410060183 A CN 201410060183A CN 103804759 A CN103804759 A CN 103804759A
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- Prior art keywords
- polyethylene
- mixing
- linking agent
- oxidation inhibitor
- peroxide cross
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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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
-
- 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
- C08L2207/066—LDPE (radical process)
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention relates to a post-processing process for a cross-linked polyethylene insulated sheathing material for cables, which is used for preparing a peroxide cross-linked polyethylene insulated material by taking polyethylene, an antioxidant and a peroxide cross-linking agent as raw materials. The post-processing process comprises the steps of material preparing, mixing and granulating, dewatering and drying, remixing, post-absorption, and cooling. According to the invention, traditional post-absorption processes and technical prejudices are essentially broken through; through a simple and subtle change implemented by changing the adding mode of the peroxide cross-linking agent, an unexpected effect is achieved, thereby solving the technical problems which can not be solved by people for a long time.
Description
Technical field
The present invention relates to the technical field of the production of crosslinked polyethylene, crosslinked polyetylene insulated sheath material aftertreatment technology for especially a kind of cable.
Background technology
In known technical field, polyethylene English name polyethylene, is called for short PE, is a kind of thermoplastic resin that ethene makes through polymerization.Industrial, also comprise the multipolymer of ethene and a small amount of alpha-olefin.Polyethylene odorless, nontoxic, feel ceraceous, there is good resistance to low temperature, minimum use temperature can reach-70～-100 ℃, and chemical stability is good, the erosion of the most of soda acids of ability, the not resistance to acid with oxidizing property, under normal temperature, be insoluble to common solvent, water-absorbent is little, and polyethylene is divided into high-density, middle density, low density and linea low density by product density size.
Polyethylene electrical insulation capability is good, and polyethylene is insulating material conventional in electric wire.But polyethylene is linear macromolecule, the shortcomings such as resistance toheat and resisting environmental stress and cracking ability are poor, only be cross-linked to form after tridimensional network, could there is following considerable change in poly physicals and chemical property: the drip phenomenon of mechanical property and burning is greatly improved, resisting environmental stress and cracking phenomenon reduces even disappearance, temperature resistant grade can be increased to 90 ℃, and solvent resistance, chemical resistant properties are obviously improved.Pure polyethylene is not containing polarity gene in addition, there are good dielectric properties, poly molecular weight does not make a difference to its dielectric properties, if but contain impurity in polyethylene, as there is polar group (hydroxyl, carbonyl) etc. in catalyzer, metal ash content and molecule, its dielectric properties are consumed to meetings such as (tangent of the dielectric loss angle) as specific inductivity, dielectric detrimentally affect occurs, therefore in polyethylene crosslinking process, need to remove impurity by filtration, purification etc., improve poly purity, polyethylene purity is higher, and its dielectric properties are better.Polyethylene mainly contains high-energy radiation, peroxide crosslinking, three kinds of cross-linking methods of crosslinked with silicane, uses and comparatively generally polyethylene is carried out to peroxide crosslinking at present.
Traditional peroxide crosslinked polyethylene insulating material manufacturing technology steps is: by polyethylene, oxidation inhibitor and peroxide cross-linking agent batching mixing-mixing granulator-centrifuge dehydration-fluidized drying---cooling metering packing, peroxide cross-linking agent is mainly to adopt dicumyl peroxide (being called for short DCP), the defect that this traditional manufacturing process exists is as follows: (1) because peroxide cross-linking agent DCP is online injection, polyethylene, oxidation inhibitor and three kinds of feed proportionings of peroxide cross-linking agent add simultaneously in mixing roll, carry out mixing.Because the decomposition temperature of DCP is 120～125 ℃, in order to prevent the fast decoupled of DCP, mixing granulator can only carry out below lower than DCP decomposition temperature, and actual mixing granulator temperature will, lower than 120 ℃, fully melt but oxidation inhibitor generally will reach 150～160 ℃ of ability.This just makes: (1) cannot make polyethylene and high-melting-point oxidation inhibitor mixing under comparatively high temps, make fully melting and the dispersion effectively of dystectic oxidation inhibitor, make oxidation inhibitor and polyethylene mixing inhomogeneous, there is the phenomenons such as powdery point, thereby make stability, the reliability variation of insulating material, electrical property declines; (2) cannot make polyethylene and high-melting-point oxidation inhibitor mixing under comparatively high temps, this makes the viscosity of melt large, pressure is high, cannot filter the impurity in raw material and (as install filtering net etc. additional, the full-bodied melt of low temperature cannot be smoothly by filtering purifying equipments such as filtering nets), therefore after tradition in absorption technique without filtration step, the insulating material foreign matter content of producing is high, and degree of cleaning are poor, and electrical insulation capability is poor; (3) DCP exists trace to decompose in extruding pelletization process, produces precrosslink material, causes quality product to decline.
Therefore finding one can avoid above-mentioned defect, producing high-quality peroxide crosslinked polyethylene insulating material production technique is that people urgently wish to solve, but insurmountable technical barrier always.。
Summary of the invention
The technical problem to be solved in the present invention is: overcome the problems referred to above, the crosslinked polyetylene insulated sheath material aftertreatment technology for cable of a kind of mixing even, rear good absorbing effect, technique advantages of simple is provided.
The technical solution adopted for the present invention to solve the technical problems is: crosslinked polyetylene insulated sheath material aftertreatment technology for a kind of cable, be to prepare peroxide crosslinked polyethylene insulating material take polyethylene, oxidation inhibitor and peroxide cross-linking agent as raw material, it is characterized in that: treatment process steps is as follows thereafter:
(1) batching: oxidation inhibitor and polyethylene are carried out to mix, and described oxidation inhibitor is Powdered oxidation inhibitor, and polyethylene is particulate state Low Density Polyethylene, peroxide cross-linking agent is the liquid peroxide cross-linking agent through filtering;
(2) mixing granulator: batching is carried out in mixing roll mixing, the material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 160～200 ℃;
(3) dehydrate: the material that granulation in step (2) is obtained dehydrates, and obtains intermediate;
(4) remix: the intermediate obtaining in step (3) is mixed with peroxide cross-linking agent, and mixing temperature is 50～90 ℃, and mixing time is 5～240min;
(5) after, absorb: the material obtaining in step (4) is carried out to rear absorption;
(6) cooling: after material is cooling, to obtain peroxide crosslinked polyethylene insulating sheath material.
Further, as a kind of concrete embodiment, polyethylene described in the present invention, oxidation inhibitor and peroxide cross-linking agent three weight ratio are 49: 0.1～0.23: 1.2～2.7.
Further, as a kind of concrete embodiment, temperature when rear absorption described in the present invention is 40～75 ℃, and the time of rear absorption is 8～20h.
Further, as a kind of concrete embodiment, the filter plant adopting while filtration described in the present invention is filtering net or industrial filter, and filtering order number is 80～500 orders.
The invention has the beneficial effects as follows:
(1) polyethylene and high-melting-point oxidation inhibitor are mixing under the comparatively high temps that exceedes oxidation inhibitor fusing point, make the abundant melting of high-melting-point oxidation inhibitor and effectively disperse, improve the electrical property of product, therefore oxidation inhibitor and polyethylene are mixing evenly, stability, the reliability of insulating material are very good, electrical property strengthens, good electrical property;
(2) polyethylene and oxidation inhibitor are mixing under comparatively high temps, reduce the viscosity of melt, can be smoothly through the filtering purifying equipment such as filtering net, strainer, therefore in mixing granulator step of the present invention, add filtration, material after mixing carries out extruding pelletization after filtering again, removes the impurity in material, effectively controls the foreign matter content in product, the cleanliness factor of product is high, and insulating material electrical insulation capability prepared by the inventive method is good;
(3) because the present invention has increased remix, peroxide cross-linking agent mixes at low temperatures with intermediate, effectively avoid superoxide to decompose in advance the precrosslink material of generation, peroxide cross-linking agent and intermediate mix abundant, even simultaneously, promote the validity of rear absorption, carry out at low temperatures again physical adsorption, rear good absorbing effect, quality product is very good;
(4) in addition in remix step, what the peroxide cross-linking agent of use adopted is the liquid peroxide cross-linking agent through filtering, and remix and rear assimilation effect can be better.From the above the present invention is mixing evenly, rear good absorbing effect, and technique is simple, rationally, the insulating material stable performance that produces, reliable, good product quality, and also preparation cost is low, and cost performance is very high;
The present invention from broken through in essence traditional absorption technique and people's technology prejudice, by changed peroxide cross-linking agent add mode this simply, cleverly change, but obtain effect beyond expectation, solved people's insurmountable technical barrier always for a long time.
Embodiment
The preferred embodiment of crosslinked polyetylene insulated sheath material aftertreatment technology for a kind of cable of the present invention, be to prepare peroxide crosslinked polyethylene insulating material take polyethylene, oxidation inhibitor and peroxide cross-linking agent as raw material, it is characterized in that: treatment process steps is as follows thereafter:
(1) batching: oxidation inhibitor and polyethylene are carried out to mix, and described oxidation inhibitor is Powdered oxidation inhibitor, and polyethylene is particulate state Low Density Polyethylene, peroxide cross-linking agent is the liquid peroxide cross-linking agent through filtering;
(2) mixing granulator: batching is carried out in mixing roll mixing, the material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 160～200 ℃;
(3) dehydrate: the material that granulation in step (2) is obtained dehydrates, and obtains intermediate;
(4) remix: the intermediate obtaining in step (3) is mixed with peroxide cross-linking agent, and mixing temperature is 50～90 ℃, and mixing time is 5～240min;
(5) after, absorb: the material obtaining in step (4) is carried out to rear absorption;
(6) cooling: after material is cooling, to obtain peroxide crosslinked polyethylene insulating sheath material.
Described polyethylene, oxidation inhibitor and peroxide cross-linking agent three weight ratio are 49: 0.1～0.23: 1.2～2.7.
Temperature when described rear absorption is 40～75 ℃, and the time of rear absorption is 8～20h.
The filter plant adopting when described filtration is filtering net or industrial filter, and filtering order number is 80～500 orders.
Take above-mentioned foundation desirable embodiment of the present invention as enlightenment, by above-mentioned description, relevant staff can, not departing from the scope of this invention technological thought, carry out various change and modification completely.The technical scope of this invention is not limited to the content on specification sheets, must determine its technical scope according to claim scope.
Claims (4)
1. a crosslinked polyetylene insulated sheath material aftertreatment technology for cable, is to prepare peroxide crosslinked polyethylene insulating material take polyethylene, oxidation inhibitor and peroxide cross-linking agent as raw material, it is characterized in that: treatment process steps is as follows thereafter:
(1) batching: oxidation inhibitor and polyethylene are carried out to mix, and described oxidation inhibitor is Powdered oxidation inhibitor, and polyethylene is particulate state Low Density Polyethylene, peroxide cross-linking agent is the liquid peroxide cross-linking agent through filtering;
(2) mixing granulator: batching is carried out in mixing roll mixing, the material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 160～200 ℃;
(3) dehydrate: the material that granulation in step (2) is obtained dehydrates, and obtains intermediate;
(4) remix: the intermediate obtaining in step (3) is mixed with peroxide cross-linking agent, and mixing temperature is 50～90 ℃, and mixing time is 5～240min;
(5) after, absorb: the material obtaining in step (4) is carried out to rear absorption;
(6) cooling: after material is cooling, to obtain peroxide crosslinked polyethylene insulating sheath material.
2. crosslinked polyetylene insulated sheath material aftertreatment technology for a kind of cable as claimed in claim 1, is characterized in that: described polyethylene, oxidation inhibitor and peroxide cross-linking agent three weight ratio are 49: 0.1～0.23: 1.2～2.7.
3. crosslinked polyetylene insulated sheath material aftertreatment technology for a kind of cable as claimed in claim 1, is characterized in that: temperature when described rear absorption is 40～75 ℃, and the time of rear absorption is 8～20h.
4. crosslinked polyetylene insulated sheath material aftertreatment technology for a kind of cable as claimed in claim 1, is characterized in that: the filter plant adopting when described filtration is filtering net or industrial filter, and filtering order number is 80～500 orders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410060183.6A CN103804759A (en) | 2014-02-21 | 2014-02-21 | Post-processing process for cross-linked polyethylene insulated sheathing material for cables |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410060183.6A CN103804759A (en) | 2014-02-21 | 2014-02-21 | Post-processing process for cross-linked polyethylene insulated sheathing material for cables |
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| CN103804759A true CN103804759A (en) | 2014-05-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557431A (en) * | 2018-11-19 | 2019-04-02 | 国网北京市电力公司 | A kind of immersion measurement method based on XLPE cable insulation tabletting sample |
-
2014
- 2014-02-21 CN CN201410060183.6A patent/CN103804759A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557431A (en) * | 2018-11-19 | 2019-04-02 | 国网北京市电力公司 | A kind of immersion measurement method based on XLPE cable insulation tabletting sample |
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Application publication date: 20140521 |
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