CN101781419A - Organosilane crosslinked polyethylene insulation material for 20kV cable and preparation method thereof - Google Patents
Organosilane crosslinked polyethylene insulation material for 20kV cable and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an organosilane crosslinked polyethylene insulation material for 20kV cables and a preparation method thereof. The insulation material comprises a material A, a material B and a material C, wherein the material A comprises the following components in parts by weight: 100 parts of polyethylene, 0.01-1 part of initiator, 0.2-5 parts of silane crosslinking agent and 0.01-0.5 part of antioxidant; the material B comprises the following components in parts by weight: 100 parts of polyethylene, 0.5-5 parts of catalyst, 1-30 parts of catalyst promoter and 0.1-0.5 part of antioxidant; and the material C comprises the following components in parts by weight: 100 parts of ethylene-octylene copolymer, 0.01-5 parts of processing aid and 0.2-5 parts of metal ion inhibitor. The preparation method comprises the following steps of: (1) respectively extracting the raw materials of the material A, the material B and the material C and then feeding into an extruder for mixing and pelletizing to obtain three types of granule materials; (2) extracting the three types of granule materials based on a proportion of 100:4-7:2-6 and then fully mixing; and (3) feeding the mixed materials into the extruder for extruding to obtain a finished product. The preparation method has high hydrolysis cross-linking speed, flexible processing technology and simple operation. The insulation material has high voltage withstanding grade and long service life.
Description
Technical field
The present invention relates to a kind of organosilane cross-linked poly-ethylene cable material and preparation method thereof, especially a kind of 20kV cable belongs to technical field of polymer materials with organosilane crosslinked polyethylene insulating material and preparation method thereof.
Background technology
Polyethylene is an insulating material commonly used in the electric wire, but polyethylene is a linear macromolecule, resistance toheat and resisting environmental stress and cracking ability are relatively poor, after only being cross-linked to form tridimensional network, considerable change could take place in the polyethylene physical and chemical performance, and mechanical property and incendiary drip phenomenon just can be greatly improved, and the resisting environmental stress and cracking phenomenon could reduce even disappear, temperature resistant grade just can be increased to 90 ℃, and solvent resistance, chemical resistant properties could obviously be improved.
The main means of polyethylene crosslinking have three kinds, and high-energy radiation is crosslinked, peroxide crosslinking, crosslinked with silicane.High-energy irradiation cross-linking apparatus costliness has irradiation to pollute, and the thin cross-linked polyethylene insulated cable of insulation layer is generally produced in the difficult control of production technique.Peroxide crosslinking, polyethylene requires accurately processing temperature, and manufacturing process has the performance change of deviation product very big slightly, and the equipment integral investment is big, and floor space is big.Organosilane crosslinked polyethylene is introduced crosslinkable group by grafting or copolymerization on Polyethylene Chain, and then makes it crosslinked by hydrolysis, does not need specific equipment, and common forcing machine just can processing, and technology is simple.
The mode of crosslinked with silicane grafted polyethylene mainly contains copolymerization method, single stage method and two-step approach.Copolymerization method is ethene and silane crosslinker copolymerization, generally can only be finished by petro-chemical corporation.One-step silane cross-linked polyethylene need adopt specific installation, and level of response is wayward, promotes the use of and is limited to.Traditional two-step approach organosilane crosslinked polyethylene is: the first step at first is grafted to silane on the sub polyethylene subchain, forms the A material, secondly with catalyzer and the mixing formation of polyethylene B material.Second step was extruded A material and B material by a certain percentage after the mixing, the product of moulding is hydrolyzed crosslinked under hot water bath or water vapour.
Traditional two step method is made organosilane crosslinked polyethylene following shortcoming: 1, silane grafted process has the side reaction of peroxide crosslinking, and it is mobile bad that grafting A expects, is difficult for processing.2, organosilane crosslinked polyethylene need be finished hydrolytic crosslinking in warm water bath or water vapour, water molecules is a polarity, and polyethylene is nonpolar, water molecules in polyethylene velocity of diffusion slower, particularly the insulation layer of 20kV cable is thicker, and the time that hydrolytic crosslinking needs is long especially.3, the organosilane crosslinked polyethylene insulating material voltage withstand class of this two step method manufacturing is lower, generally can only be applicable to 10kV and following cross-linked polyethylene insulated cable.
Summary of the invention
The objective of the invention is to overcome the shortcoming in the prior art, a kind of 20kV cable organosilane crosslinked polyethylene insulating material and preparation method thereof is provided.This preparation method has improved the speed of response of hydrolytic crosslinking greatly, makes complete processing very convenient flexibly, operates simpler.With the cable insulation material voltage withstand class height of this preparation method preparation, long service life is particularly suitable for 20kV crosslinked polyethylene overhead line.
Technical scheme of the present invention is: a kind of 20kV cable organosilane crosslinked polyethylene insulating material, form by A material, B material and C material.Wherein
The component and the parts by weight of A material are: polyethylene 100, initiator 0.01～1, silane crosslinker 0.2～5, oxidation inhibitor 0.01～0.5.The component and the parts by weight of B material are: polyethylene 100, catalyzer 0.5～5, promotor 1～30, oxidation inhibitor 0.1～0.5.The component and the parts by weight of C material are: ethylene-octene copolymer 100, processing aid 0.01～5, metal ion inhibitor 0.2～5.
Described polyethylene is selected one or more the composition in new LDPE (film grade), ultra-low density polyethylene, linear low density of polyethylene, metallocene linear low density of polyethylene, medium-density polyethylene, the high density polyethylene(HDPE) for use.
Described initiator is selected a kind of in dicumyl peroxide, di-tert-butyl peroxide, the benzoyl peroxide for use.
Described silane crosslinker is selected vinyltrimethoxy silane or vinyltriethoxysilane for use.
Described oxidation inhibitor selects 1010,1135,1035,1076 for use, one or more the composition in DLTP, 168,300#, the dihydroxyphenyl propane.
Described catalyzer is selected a kind of in positive tetrabutyl zirconate, dioctyl dibutyl tin, dibutyltin diacetate, the dibutyl tin laurate for use.
Described promotor is selected one or more the composition among EVA, EEA, PEG, MAH-g-PE, the MAH-g-EVA for use.
It is one or more composition in 2%, 5%, 10%, 18%, 20%, 30% the multipolymer that described POE is selected octene content for use.
Described processing aid is selected the polyethylene composition of one or more among the fluorine-containing PPA of amine hydroxybenzene, polyethylene wax, Poly Propylene Wax or rheological agent with lubricator for use.
Described metal ion inhibitor is selected one or more the composition in oxalic acid diamide, salicylic amide, diamine two acyls for use.It is aging to insulating catalysis that this inhibitor can suppress cable copper core cupric ion, can prolong the work-ing life of cable effectively.
The 20kV cable comprises following processing step with the preparation method of organosilane crosslinked polyethylene insulating material:
1., extract each raw material and it be sent to according to A material raw material weight proportioning and carry out mixing granulator in the twin screw extruder, obtain A material particulate material.
2., extract each raw material and it be sent to according to B material raw material weight proportioning and carry out mixing granulator in the twin screw extruder, obtain B material particulate material.
3., extract each raw material and it be sent to according to C material raw material weight proportioning and carry out mixing granulator in the twin screw extruder, obtain C material particulate material.
4., send into blender again after gained A material, B material and three kinds of particulate material of C material are extracted with 100: 4～7: 2～6 ratio and carry out the fully mixed blended stock that obtains above-mentioned 1., 2., 3..
5., above-mentioned 4. gained blended stock being sent into single screw extrusion machine extrudes and obtains finished product.
The present invention uses the polar macromolecular material in B material, i.e. promotor can be accelerated the velocity of diffusion of water molecules greatly, improves the speed of response of hydrolytic crosslinking greatly.Add the polyethylene auxiliary rheological agents in the C material, promptly processing aid has strengthened the flowability that grafting A expects greatly, makes this complete processing very convenient flexibly, operates simpler; In the C material, use ethylene-octene copolymer, can greatly improve poly voltage withstand class as base-material; Use the metal ion inhibitor in the C material, it is aging to insulating catalysis to suppress cable copper core cupric ion, can prolong the work-ing life of cable effectively.
The invention has the beneficial effects as follows provides a kind of 20kV cable organosilane crosslinked polyethylene insulating material and preparation method thereof.This preparation method has improved the speed of response of hydrolytic crosslinking greatly, makes complete processing very convenient flexibly, operates simpler.With the cable insulation material voltage withstand class height of this preparation method preparation, long service life is particularly suitable for 20kV crosslinked polyethylene overhead line.
Embodiment
Following examples are to further specify of the present invention, rather than limit the scope of the invention.
Embodiment 1: a kind of 20kV cable organosilane crosslinked polyethylene insulating material, form by A material, B material and C material.Wherein
The component and the parts by weight of A material are: new LDPE (film grade) 80, linear low density of polyethylene 20, dicumyl peroxide 0.05, vinyltrimethoxy silane 1.6, antioxidant 1010 0.2.
The component and the parts by weight of B material are: new LDPE (film grade) 10, linear low density of polyethylene 90, positive tetrabutyl zirconate 1, promotor EVA 10, antioxidant 1010 0.2.
The component and the parts by weight of C material are: octene content is 10% ethylene-octene copolymer 100, polyethylene wax 3, salicylic amide 1.5.
The 20kV cable comprises following processing step with the preparation method of organosilane crosslinked polyethylene insulating material:
1., extract each raw material and it be sent to according to above-mentioned A material raw material weight proportioning and carry out mixing granulator in the twin screw extruder, obtain A material particulate material.
2., extract each raw material and it be sent to according to above-mentioned B material raw material weight proportioning and carry out mixing granulator in the twin screw extruder, obtain B material particulate material.
3., extract each raw material and it be sent to according to above-mentioned C material raw material weight proportioning and carry out mixing granulator in the twin screw extruder, obtain C material particulate material.
4., 1., 2., 3. gained A material, B material and three kinds of particulate material of C material are with 100: 5: 3 with above-mentioned, send into blender again after ratio is extracted and carry out the fully mixed blended stock that obtains.
5., above-mentioned 4. gained blended stock being sent into single screw extrusion machine extrudes and obtains finished product.
Embodiment 2:
A kind of 20kV cable organosilane crosslinked polyethylene insulating material is made up of A material, B material and C material.Wherein
The component and the parts by weight of A material are: new LDPE (film grade) 50, high density polyethylene(HDPE) 50, dicumyl peroxide 0.04, vinyltriethoxysilane 1.6, antioxidant 300 # 0.2.The component and the parts by weight of B material are: new LDPE (film grade) 100, dibutyltin diacetate 1.6, promotor EEA 8, oxidation inhibitor 168 0.2.The component and the parts by weight of C material are: octene content is 5% ethylene-octene copolymer 100, Poly Propylene Wax 3, oxalic acid diamide 1.0.
Among the preparation method of 20kV crosslinked polyethylene overhead line with the organosilane crosslinked polyethylene insulating material: A material, B material and three kinds of particulate material of C material are to send into blender again after extracting with 100: 5.5: 3.5 ratio to carry out the fully mixed blended stock that obtains.Other processing steps are all identical with embodiment 1.
Embodiment 3:
A kind of 20kV crosslinked polyethylene overhead line organosilane crosslinked polyethylene insulating material is made up of A material, B material and C material.Wherein
The component and the parts by weight of A material are: medium-density polyethylene 40, ultra-low density polyethylene 60, dicumyl peroxide 0.04, vinyltriethoxysilane 1.8, anti-oxidant DLTP 0.2.The component and the parts by weight of B material are: linear low density polyethylene 100, dibutyl tin laurate 1.2, promotor EEA8, antioxidant 1076 0.2.The component and the parts by weight of C material are: octene content is 18% ethylene-octene copolymer 100, the fluorine-containing PPA 1.5 of rheological agent, oxalic acid diamide 1.0.
Among the preparation method of 20kV crosslinked polyethylene overhead line with the organosilane crosslinked polyethylene insulating material: A material, B material and three kinds of particulate material of C material are to send into blender again after extracting with 100: 6: 4 ratio to carry out the fully mixed blended stock that obtains.Other processing steps are all identical with embodiment 1.
Claims (2)
1. 20kV cable organosilane crosslinked polyethylene insulating material is characterized in that: is made up of A material, B material and C material, component and parts by weight that A expects are: polyethylene 100, initiator 0.01～1, silane crosslinker 0.2～5, oxidation inhibitor 0.01～0.5; The component and the parts by weight of B material are: polyethylene 100, catalyzer 0.5～5, promotor 1～30, oxidation inhibitor 0.1～0.5; The component and the parts by weight of C material are: ethylene-octene copolymer 100, processing aid 0.01～5, metal ion inhibitor 0.2～5;
Described polyethylene is selected one or more the composition in new LDPE (film grade), ultra-low density polyethylene, linear low density of polyethylene, metallocene linear low density of polyethylene, medium-density polyethylene, the high density polyethylene(HDPE) for use;
Described initiator is selected a kind of in dicumyl peroxide, di-tert-butyl peroxide, the benzoyl peroxide for use;
Described silane crosslinker is selected vinyltrimethoxy silane or vinyltriethoxysilane for use;
Described oxidation inhibitor selects 1010,1135,1035,1076 for use, one or more the composition in DLTP, 168,300#, the dihydroxyphenyl propane;
Described catalyzer is selected a kind of in positive tetrabutyl zirconate, dioctyl dibutyl tin, dibutyltin diacetate, the dibutyl tin laurate for use;
Described promotor is selected one or more the composition among EVA, EEA, PEG, MAH-g-PE, the MAH-g-EVA for use;
It is one or more composition in 2%, 5%, 10%, 18%, 20%, 30% the multipolymer that described POE is selected octene content for use;
Described metal ion inhibitor is selected one or more the composition in oxalic acid diamide, salicylic amide, diamine two acyls for use;
Described processing aid is selected the polyethylene composition of one or more among the fluorine-containing PPA of amine hydroxybenzene, polyethylene wax, Poly Propylene Wax or rheological agent with lubricator for use.
2. a kind of 20kV cable according to claim 1 preparation method of organosilane crosslinked polyethylene insulating material, it is characterized in that: it comprises following processing step:
1., extract each raw material and it be sent to according to above-mentioned A material raw material weight proportioning and carry out mixing granulator in the twin screw extruder, obtain A material particulate material;
2., extract each raw material and it be sent to according to above-mentioned B material raw material weight proportioning and carry out mixing granulator in the twin screw extruder, obtain B material particulate material;
3., extract each raw material and it be sent to according to above-mentioned C material raw material weight proportioning and carry out mixing granulator in the twin screw extruder, obtain C material particulate material;
4., send into blender again after gained A material, B material and three kinds of particulate material of C material are extracted with 100: 4～7: 2～6 ratio and carry out the fully mixed blended stock that obtains above-mentioned 1., 2., 3.;
5., above-mentioned 4. gained blended stock being sent into single screw extrusion machine extrudes and obtains finished product.
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