CN102241848A - Post-absorption process of peroxide cross-linking polyethylene insulating material - Google Patents
Post-absorption process of peroxide cross-linking polyethylene insulating material Download PDFInfo
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Abstract
The invention relates to an insulating material for electric power cables, in particular to a post-absorption process of a peroxide cross-linking polyethylene insulating material. The process comprises the following steps of: (1) material blending: antioxidant and polyethylene are blended; (2) mixing and pelletizing: the blended materials are mixed in a mixing roll, and the mixed materials are filtered and then extruded and pelletized; (3) dehydrating and drying: the materials derived from pelletizing in the step 2 are dehydrated and dried to obtain an intermediate; (4) remixing: the intermediate derived from the step 3 is mixed with a peroxide cross-linking agent for 5 to 240 minutes at the temperature from 50 DEG C to 80 DEG C; (5) post-absorbing: the material derived from the step 4 is post-absorbed; and (6) cooling: the material derived from the step 5 is cooled to obtain the peroxide cross-linking polyethylene insulating material. The process in the invention is uniform in mixing, good in post-absorption effect and simple and reasonable in process; and the manufactured insulating material has reliable performances and good quality.
Description
Technical field
The present invention relates to a kind of power cable insulating material, particularly a kind of peroxide crosslinked polyethylene insulating material post-absorption technology.The peroxide crosslinked polyethylene insulating material of this technology manufacturing is applicable to senior middle school's lv power cable, is particularly useful for 35kV and following power cable.
Background technology
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, the feel ceraceous, has 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, not anti-acid with oxidizing property, be insoluble to common solvent under the normal temperature, water-absorbent is little, and polyethylene is divided into high-density, middle density, low density and linea low density by the product density size.The polyethylene electrical insulation capability is good, and polyethylene is an insulating material commonly used in the electric wire.But polyethylene is a linear macromolecule, shortcomings such as resistance toheat and resisting environmental stress and cracking ability are relatively poor, after only being cross-linked to form tridimensional network, following considerable change could take place for poly physicals and chemical property: mechanical property and incendiary drip phenomenon are greatly improved, the resisting environmental stress and cracking phenomenon reduces even disappears, temperature resistant grade can be increased to 90 ℃, and solvent resistance, chemical resistant properties are obviously improved.Pure in addition polyethylene does not contain polarity gene, has excellent dielectric properties, poly molecular weight does not make a difference to its dielectric properties, but in the polyethylene if contain impurity, as there being polar group (hydroxyl, carbonyl) etc. in catalyzer, metal ash content and the molecule, to its dielectric properties such as specific inductivity, dielectric consume (tangent of the dielectric loss angle) etc. detrimentally affect can take place then, therefore in the polyethylene crosslinking process, need to remove impurity by filtration, purification etc., improve poly purity, polyethylene purity is high more, and its dielectric properties are good more.Polyethylene mainly contains high-energy radiation, peroxide crosslinking, three kinds of cross-linking methods of crosslinked with silicane, uses at present and comparatively generally polyethylene is carried out peroxide crosslinking.Traditional peroxide crosslinked polyethylene insulating material manufacturing process step is: with polyethylene, oxidation inhibitor and peroxide cross-linking agent batch mixes-mixing granulator-centrifuge dehydration-fluidized drying---the cooling metering packing, peroxide cross-linking agent mainly is to adopt dicumyl peroxide (being called for short DCP), the defective that this traditional manufacturing process exists is as follows: (1) because peroxide cross-linking agent DCP is online injection, promptly polyethylene, oxidation inhibitor and three kinds of feed proportionings of peroxide cross-linking agent add simultaneously carry out in the mixing roll mixing.Because the decomposition temperature of DCP is 120～125 ℃, in order to prevent the quick decomposition of DCP, mixing granulator can only carry out being lower than below the DCP decomposition temperature, and actual mixing granulator temperature will be lower than 120 ℃, fully fuses but oxidation inhibitor generally will reach 150～160 ℃ of ability.This just makes: (1) can't make polyethylene and high-melting-point oxidation inhibitor mixing under comparatively high temps, make the fully fusion and disperseing effectively of dystectic oxidation inhibitor, make oxidation inhibitor and polyethylene mixing inhomogeneous, phenomenons such as powdery point appear, thereby make stability, the reliability variation of insulating material, electrical property descends; (2) can't make polyethylene and high-melting-point oxidation inhibitor mixing under comparatively high temps, this makes the viscosity of melt big, pressure is high, can't filter impurities in raw materials and (as install filtering net etc. additional, the full-bodied melt of low temperature can't be smoothly by filtering purifying equipments such as filtering nets), therefore there is not filtration step in traditional post-absorption technology, the insulating material foreign matter content height of producing, degree of cleaning are poor, and electrical insulation capability is poor; (3) DCP exists trace to decompose in the extruding pelletization process, produces the precrosslink material, causes quality product to descend.Therefore find that a kind of to avoid above-mentioned defective, produce high-quality peroxide crosslinked polyethylene insulating material production technique be that people urgently wish to solve but insurmountable always technical barrier.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, provide a kind of mixing evenly, effective, the technology advantages of simple of post-absorption, the measured novel peroxide crosslinked polyethylene insulating material post-absorption technology of insulating material dependable performance, matter that produces.
The technical scheme that realizes above-mentioned purpose is: a kind of peroxide crosslinked polyethylene insulating material post-absorption technology, be to be that feedstock production obtains the peroxide crosslinked polyethylene insulating material with polyethylene, oxidation inhibitor and peroxide cross-linking agent, described processing step is as follows:
(1) batching: oxidation inhibitor and polyethylene are prepared burden, enter next step then;
(2) mixing granulator: will preparing burden, it is mixing to carry out in mixing roll, and the material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 160～200 ℃, and the material after the granulation enters next step;
(3) dehydrate: the material that the previous step granulation is obtained dehydrates, and obtains intermediate;
(4) remix: the intermediate that previous step is obtained mixes with peroxide cross-linking agent, and mixing temperature is 50～90 ℃, and mixing time is 5～240min, and mixed material enters next step;
(5) post-absorption: the material that previous step is obtained carries out post-absorption, and the material behind the post-absorption enters next step;
(6) cooling: the material that previous step is obtained cools off, and obtains the peroxide crosslinked polyethylene insulating material.
Further, described polyethylene, oxidation inhibitor and peroxide cross-linking agent three weight ratio are 100:0.15～0.30:1.6～3.0.
Further, described oxidation inhibitor is Powdered oxidation inhibitor, and polyethylene is the particulate state new LDPE (film grade), and peroxide cross-linking agent is the filtering liquid peroxide cross-linking agent of process.
Further, described oxidation inhibitor be in No. 300 oxidation inhibitor, 1010 oxidation inhibitor, 168 oxidation inhibitor, PS802 oxidation inhibitor, 1076 oxidation inhibitor or 1035 oxidation inhibitor any.
Further, described peroxide cross-linking agent is any in dicumyl peroxide, two 2,5 vulcanizing agents or the dicumyl peroxide.
Further, the temperature during described post-absorption is 50～90 ℃, and the time of post-absorption is 3～30h.
Further, to be that single screw extrusion machine, twin screw extruder, two rank double-screw extruding pelletizing machine, single screw rod are reciprocating type extrude in tablets press, Banbury mixer or the milling machine any one with described mixing roll.
Further, the drying plant that adopts during described dehydrating is any in centrifuge, boiling-bed drying, vacuum drier or the cyclonic separator.
Further, the filter plant that adopts during described the filtration is filtering net or industrial strainer, and filtering the order number is 80～500 orders.
Realize that the main technique equipment that the present invention needs is: mixing roll, drying plant, filter plant, blending bun, post-absorption feed bin etc.
Adopt the benefit of technique scheme to be: main innovation part of the present invention is polyethylene, the adding mixing of oxidation inhibitor and three kinds of batchings of peroxide cross-linking agent is divided into two steps and finishes, only mix for the first time with polyethylene and oxidation inhibitor prepare burden carry out mixing, peroxide cross-linking agent until mixing make material wait all finish obtain intermediate after, just carrying out the second time mixes, this time mixing is that intermediate and peroxide cross-linking agent are mixed, though only increased the remix processing step in the processing step, changed the adding mode of peroxide cross-linking agent, make the present invention: (1) polyethylene and high-melting-point oxidation inhibitor surpass under the comparatively high temps of oxidation inhibitor fusing point mixing, make the abundant fusion of high-melting-point oxidation inhibitor and disperseing effectively, improve the electrical property of product, therefore oxidation inhibitor and polyethylene are mixing evenly, the stability of insulating material, reliability is very good, electrical property strengthens, good electrical property; (2) polyethylene and oxidation inhibitor are mixing under comparatively high temps, reduced the viscosity of melt, can waltz through filtering purifying equipments such as filtering net, strainer, therefore add in the mixing granulator step of the present invention and filter, material after mixing carries out extruding pelletization after filtering again, removes the impurity in the material, controls the foreign matter content in the product effectively, the cleanliness factor height of product makes the insulating material electrical insulation capability of the inventive method preparation good; (3) because the present invention has increased remix, peroxide cross-linking agent mixes at low temperatures with intermediate, effectively avoided superoxide to decompose the precrosslink material of generation in advance, peroxide cross-linking agent and intermediate mix abundant, even simultaneously, promoted the validity of back absorption, carry out physical adsorption more at low temperatures, post-absorption is effective, and quality product is very good; (4) in addition in the remix step, what the peroxide cross-linking agent of use adopted is that then remix and post-absorption effect can be better through filtering liquid peroxide cross-linking agent.From the above the present invention is mixing even, and post-absorption is effective, and technology is simple, reasonable, the insulating material stable performance that produces, reliable, and good product quality, and also preparation cost is low, and cost performance is very high.The present invention is from having broken through traditional post-absorption technology and people's technology prejudice in essence, adding mode by having changed peroxide cross-linking agent this simply, change cleverly, but obtain effect beyond expectation, solved the insurmountable always for a long time technical barrier of people.
Description of drawings
Accompanying drawing is a process flow sheet of the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with drawings and Examples.
Embodiment one
Main technique equipment: mixing roll is a single screw extrusion machine, and drying plant is a centrifuge, and filter plant is a filtering net, also includes blending bun and post-absorption feed bin etc.
A kind of peroxide crosslinked polyethylene insulating material post-absorption technology, be to be that feedstock production obtains the peroxide crosslinked polyethylene insulating material with polyethylene, oxidation inhibitor and peroxide cross-linking agent, wherein material polyethylene, oxidation inhibitor and peroxide cross-linking agent three's weight ratio is 100:0.15:1.6, oxidation inhibitor is Powdered No. 300 oxidation inhibitor, polyethylene is the particulate state new LDPE (film grade), peroxide cross-linking agent is the filtering liquid dicumyl peroxide of process, and described processing step is as follows:
(1) batching: oxidation inhibitor and polyethylene are prepared burden, oxidation inhibitor and polyethylene are weighed in proportion, put in the single screw extrusion machine after weighing, enter next step then;
(2) mixing granulator: will preparing burden, it is mixing to carry out in single screw extrusion machine, installs filtering net in the single screw extrusion machine additional, and filtering the order number is 200 orders.Material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 160 ℃, and the material after the granulation enters next step;
(3) dehydrate: the material that the previous step granulation is obtained dehydrates in centrifuge, obtains clean intermediate;
(4) remix: the intermediate that previous step is obtained with filter through 120 orders after liquid peroxide cross-linking agent in blending bun, mix, mixing temperature is 50 ℃, mixing time is 240min, mixed material enters next step;
(5) post-absorption: the material that previous step is obtained carries out post-absorption in the post-absorption storehouse, the temperature during post-absorption is 60 ℃, and the time of post-absorption is 20h, and the material behind the post-absorption enters next step;
(6) cooling: the material that previous step is obtained cools off, and obtains product peroxide crosslinked polyethylene insulating material.
Embodiment two
Main technique equipment: mixing roll is a twin screw extruder, and drying plant is a boiling-bed drying, and filter plant is industrial strainer, also includes blending bun and post-absorption feed bin etc.
A kind of peroxide crosslinked polyethylene insulating material post-absorption technology, be to be that feedstock production obtains the peroxide crosslinked polyethylene insulating material with polyethylene, oxidation inhibitor and peroxide cross-linking agent, wherein material polyethylene, oxidation inhibitor and peroxide cross-linking agent three's weight ratio is 100:0.30:2.2, oxidation inhibitor is Powdered 1010 oxidation inhibitor, polyethylene is the particulate state new LDPE (film grade), peroxide cross-linking agent is two 2,5 vulcanizing agents of the filtering liquid state of process, and described processing step is as follows:
(1) batching: oxidation inhibitor and polyethylene are prepared burden, oxidation inhibitor and polyethylene are weighed in proportion, put in the twin screw extruder after weighing, enter next step then;
(2) mixing granulator: will preparing burden, it is mixing to carry out in twin screw extruder, installs industrial strainer in the twin screw extruder additional, and filtering the order number is 80 orders.Material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 200 ℃, and the material after the granulation enters next step;
(3) dehydrate: the material that the previous step granulation is obtained dehydrates in boiling-bed drying, obtains clean intermediate;
(4) remix: the intermediate that previous step is obtained with filter through 100 orders after liquid peroxide cross-linking agent in blending bun, mix, mixing temperature is 90 ℃, mixing time is 5min, mixed material enters next step;
(5) post-absorption: the material that previous step is obtained carries out post-absorption in the post-absorption storehouse, the temperature during post-absorption is 50 ℃, and the time of post-absorption is 30h, and the material behind the post-absorption enters next step;
(6) cooling: the material that previous step is obtained cools off, and obtains product peroxide crosslinked polyethylene insulating material.
Embodiment three
Main technique equipment: mixing roll is two rank double-screw extruding pelletizing machines, and drying plant is a vacuum drier, and filter plant is a filtering net, also includes blending bun and post-absorption feed bin etc.
A kind of peroxide crosslinked polyethylene insulating material post-absorption technology, be to be that feedstock production obtains the peroxide crosslinked polyethylene insulating material with polyethylene, oxidation inhibitor and peroxide cross-linking agent, wherein material polyethylene, oxidation inhibitor and peroxide cross-linking agent three's weight ratio is 100:0.20:1.8, oxidation inhibitor is Powdered 168 oxidation inhibitor, polyethylene is the particulate state new LDPE (film grade), peroxide cross-linking agent is the filtering liquid dicumyl peroxide of process, and described processing step is as follows:
(1) batching: oxidation inhibitor and polyethylene are prepared burden, oxidation inhibitor and polyethylene are weighed in proportion, put into after weighing in the double-screw extruding pelletizing machine of two rank, enter next step then;
(2) mixing granulator: will preparing burden, it is mixing to carry out in the double-screw extruding pelletizing machine of two rank, installs filtering net additional in the double-screw extruding pelletizing machine of two rank, and filtering the order number is 400 orders.Material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 180 ℃, and the material after the granulation enters next step;
(3) dehydrate: the material that the previous step granulation is obtained dehydrates in vacuum drier, obtains clean intermediate;
(4) remix: the intermediate that previous step is obtained with filter through 80 orders after liquid peroxide cross-linking agent in blending bun, mix, mixing temperature is 80 ℃, mixing time is 50min, mixed material enters next step;
(5) post-absorption: the material that previous step is obtained carries out post-absorption in the post-absorption storehouse, the temperature during post-absorption is 90 ℃, and the time of post-absorption is 3h, and the material behind the post-absorption enters next step;
(6) cooling: the material that previous step is obtained cools off, and obtains product peroxide crosslinked polyethylene insulating material.
Embodiment four
Main technique equipment: mixing roll is the reciprocating type tablets press of extruding of single screw rod, and drying plant is a cyclonic separator, and filter plant is industrial strainer, also includes blending bun and post-absorption feed bin etc.
A kind of peroxide crosslinked polyethylene insulating material post-absorption technology, be to be that feedstock production obtains the peroxide crosslinked polyethylene insulating material with polyethylene, oxidation inhibitor and peroxide cross-linking agent, wherein material polyethylene, oxidation inhibitor and peroxide cross-linking agent three's weight ratio is 100:0.25:2.0, oxidation inhibitor is Powdered PS802 oxidation inhibitor, polyethylene is the particulate state new LDPE (film grade), peroxide cross-linking agent is the filtering liquid dicumyl peroxide of process, and described processing step is as follows:
(1) batching: oxidation inhibitor and polyethylene are prepared burden, oxidation inhibitor and polyethylene are weighed in proportion, put into after weighing that single screw rod is reciprocating type to be extruded in the tablets press, enter next step then;
(2) mixing granulator: will prepare burden and carry out mixingly in the tablets press reciprocating type the extruding of single screw rod, reciprocating type the extruding of single screw rod installed industrial strainer additional in the tablets press, and filtering the order number is 180 orders.Material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 165 ℃, and the material after the granulation enters next step;
(3) dehydrate: the material that the previous step granulation is obtained dehydrates in cyclonic separator, obtains clean intermediate;
(4) remix: the intermediate that previous step is obtained with filter through 200 orders after liquid peroxide cross-linking agent in blending bun, mix, mixing temperature is 70 ℃, mixing time is 100min, mixed material enters next step;
(5) post-absorption: the material that previous step is obtained carries out post-absorption in the post-absorption storehouse, the temperature during post-absorption is 80 ℃, and the time of post-absorption is 5h, and the material behind the post-absorption enters next step;
(6) cooling: the material that previous step is obtained cools off, and obtains product peroxide crosslinked polyethylene insulating material.
Embodiment five
Main technique equipment: mixing roll is a Banbury mixer, and drying plant is a centrifuge, and filter plant is a filtering net, also includes blending bun and post-absorption feed bin etc.
A kind of peroxide crosslinked polyethylene insulating material post-absorption technology, be to be that feedstock production obtains the peroxide crosslinked polyethylene insulating material with polyethylene, oxidation inhibitor and peroxide cross-linking agent, wherein material polyethylene, oxidation inhibitor and peroxide cross-linking agent three's weight ratio is 100:0.18:3.0, oxidation inhibitor is Powdered 1076 oxidation inhibitor, polyethylene is the particulate state new LDPE (film grade), peroxide cross-linking agent is two 2,5 vulcanizing agents of the filtering liquid state of process, and described processing step is as follows:
(1) batching: oxidation inhibitor and polyethylene are prepared burden, oxidation inhibitor and polyethylene are weighed in proportion, put in the Banbury mixer after weighing, enter next step then;
(2) mixing granulator: will preparing burden, it is mixing to carry out in Banbury mixer, installs filtering net in the Banbury mixer additional, and filtering the order number is 150 orders.Material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 190 ℃, and the material after the granulation enters next step;
(3) dehydrate: the material that the previous step granulation is obtained dehydrates in centrifuge, obtains clean intermediate;
(4) remix: the intermediate that previous step is obtained with filter through 150 orders after liquid peroxide cross-linking agent in blending bun, mix, mixing temperature is 65 ℃, mixing time is 150min, mixed material enters next step;
(5) post-absorption: the material that previous step is obtained carries out post-absorption in the post-absorption storehouse, the temperature during post-absorption is 70 ℃, and the time of post-absorption is 10h, and the material behind the post-absorption enters next step;
(6) cooling: the material that previous step is obtained cools off, and obtains product peroxide crosslinked polyethylene insulating material.
Embodiment six
Main technique equipment: mixing roll is a milling machine, and drying plant is a boiling-bed drying, and filter plant is industrial strainer, also includes blending bun and post-absorption feed bin etc.
A kind of peroxide crosslinked polyethylene insulating material post-absorption technology, be to be that feedstock production obtains the peroxide crosslinked polyethylene insulating material with polyethylene, oxidation inhibitor and peroxide cross-linking agent, wherein material polyethylene, oxidation inhibitor and peroxide cross-linking agent three's weight ratio is 100:0.17:2.4, oxidation inhibitor is Powdered 1035 oxidation inhibitor, polyethylene is the particulate state new LDPE (film grade), peroxide cross-linking agent is the filtering liquid dicumyl peroxide of process, and described processing step is as follows:
(1) batching: oxidation inhibitor and polyethylene are prepared burden, oxidation inhibitor and polyethylene are weighed in proportion, put in the milling machine after weighing, enter next step then;
(2) mixing granulator: will preparing burden, it is mixing to carry out in milling machine, installs industrial strainer in the milling machine additional, and filtering the order number is 100 orders.Material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 170 ℃, and the material after the granulation enters next step;
(3) dehydrate: the material that the previous step granulation is obtained dehydrates in boiling-bed drying, obtains clean intermediate;
(4) remix: the intermediate that previous step is obtained with filter through 140 orders after liquid peroxide cross-linking agent in blending bun, mix, mixing temperature is 75 ℃, mixing time is 70min, mixed material enters next step;
(5) post-absorption: the material that previous step is obtained carries out post-absorption in the post-absorption storehouse, the temperature during post-absorption is 65 ℃, and the time of post-absorption is 15h, and the material behind the post-absorption enters next step;
(6) cooling: the material that previous step is obtained cools off, and obtains product peroxide crosslinked polyethylene insulating material.
Embodiment seven
Main technique equipment: mixing roll is a twin screw extruder, and drying plant is a boiling-bed drying, and filter plant is a filtering net, also includes blending bun and post-absorption feed bin etc.
A kind of peroxide crosslinked polyethylene insulating material post-absorption technology, be to be that feedstock production obtains the peroxide crosslinked polyethylene insulating material with polyethylene, oxidation inhibitor and peroxide cross-linking agent, wherein material polyethylene, oxidation inhibitor and peroxide cross-linking agent three's weight ratio is 100:0.28:2.5, oxidation inhibitor is Powdered No. 300 oxidation inhibitor, polyethylene is the particulate state new LDPE (film grade), peroxide cross-linking agent is the filtering liquid dicumyl peroxide of process, and described processing step is as follows:
(1) batching: oxidation inhibitor and polyethylene are prepared burden, oxidation inhibitor and polyethylene are weighed in proportion, put in the twin screw extruder after weighing, enter next step then;
(2) mixing granulator: will preparing burden, it is mixing to carry out in twin screw extruder, installs filtering net in the twin screw extruder additional, and filtering the order number is 500 orders.Material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 185 ℃, and the material after the granulation enters next step;
(3) dehydrate: the material that the previous step granulation is obtained dehydrates in boiling-bed drying, obtains clean intermediate;
(4) remix: the intermediate that previous step is obtained with filter through 80 orders after liquid peroxide cross-linking agent in blending bun, mix, mixing temperature is 60 ℃, mixing time is 200min, mixed material enters next step;
(5) post-absorption: the material that previous step is obtained carries out post-absorption in the post-absorption storehouse, the temperature during post-absorption is 55 ℃, and the time of post-absorption is 25h, and the material behind the post-absorption enters next step;
(6) cooling: the material that previous step is obtained cools off, and obtains product peroxide crosslinked polyethylene insulating material.
Embodiment eight
Main technique equipment: mixing roll is a Banbury mixer, and drying plant is a vacuum drier, and filter plant is a filtering net, also includes blending bun and post-absorption feed bin etc.
A kind of peroxide crosslinked polyethylene insulating material post-absorption technology, be to be that feedstock production obtains the peroxide crosslinked polyethylene insulating material with polyethylene, oxidation inhibitor and peroxide cross-linking agent, wherein material polyethylene, oxidation inhibitor and peroxide cross-linking agent three's weight ratio is 100:0.22:1.9, oxidation inhibitor is Powdered 1010 oxidation inhibitor, polyethylene is the particulate state new LDPE (film grade), peroxide cross-linking agent is the filtering liquid dicumyl peroxide of process, and described processing step is as follows:
(1) batching: oxidation inhibitor and polyethylene are prepared burden, oxidation inhibitor and polyethylene are weighed in proportion, put in the Banbury mixer after weighing, enter next step then;
(2) mixing granulator: will preparing burden, it is mixing to carry out in Banbury mixer, installs filtering net in the Banbury mixer additional, and filtering the order number is 300 orders.Material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 195 ℃, and the material after the granulation enters next step;
(3) dehydrate: the material that the previous step granulation is obtained dehydrates in vacuum drier, obtains clean intermediate;
(4) remix: the intermediate that previous step is obtained with filter through 130 orders after liquid peroxide cross-linking agent in blending bun, mix, mixing temperature is 85 ℃, mixing time is 20min, mixed material enters next step;
(5) post-absorption: the material that previous step is obtained carries out post-absorption in the post-absorption storehouse, the temperature during post-absorption is 75 ℃, and the time of post-absorption is 8h, and the material behind the post-absorption enters next step;
(6) cooling: the material that previous step is obtained cools off, and obtains product peroxide crosslinked polyethylene insulating material.
The peroxide cross-linking agent that uses in the 4th step remix step in the various embodiments described above for through filtering liquid dicumyl peroxide or for through two 2,5 vulcanizing agents of filtering liquid state or for through filtering liquid dicumyl peroxide the time the best.The peroxide cross-linking agent that uses in the present invention's the 4th step remix step also can be selected for use and be solid dicumyl peroxide or two 2 in addition to the implementation, in 5 vulcanizing agents or the dicumyl peroxide any, when the superoxide linking agent is solid, the solid peroxide linking agent can be fused into liquid in the water bath heat preservation still, mix through filtering the intermediate that obtains in back and the remix previous step then.The drying plant that adopts when dehydrating in the various embodiments described above in addition is any in centrifuge, boiling-bed drying, vacuum drier or the cyclonic separator, the drying plant that adopts when in addition, dehydrating also can adopt several combination arbitrarily in centrifuge, boiling-bed drying, vacuum drier or the cyclonic separator.Oxidation inhibitor in the foregoing description is in selecting 300 oxidation inhibitor, 1010 oxidation inhibitor, 168 oxidation inhibitor, PS802 oxidation inhibitor, 1076 oxidation inhibitor or 1035 oxidation inhibitor for use any, in addition, oxidation inhibitor of the present invention can also be selected several combination arbitrarily in 300 oxidation inhibitor, 1010 oxidation inhibitor, 168 oxidation inhibitor, PS802 oxidation inhibitor, 1076 oxidation inhibitor or 1035 oxidation inhibitor for use.Polyethylene also can be selected Powdered new LDPE (film grade) for use among the present invention, but polyethylene the best when selecting the particulate state new LDPE (film grade) for use.
Remove the various embodiments described above, embodiment of the present invention also have a lot, can carry out multiple combination, can't list exhaustive and one by one, and the technical scheme that all employings are equal to or equivalence is replaced is all within protection scope of the present invention.
Claims (9)
1. peroxide crosslinked polyethylene insulating material post-absorption technology is to be that feedstock production obtains the peroxide crosslinked polyethylene insulating material with polyethylene, oxidation inhibitor and peroxide cross-linking agent, it is characterized in that described processing step is as follows:
(1) batching: oxidation inhibitor and polyethylene are prepared burden, enter next step then;
(2) mixing granulator: will preparing burden, it is mixing to carry out in mixing roll, and the material after mixing carries out extruding pelletization after filtering, and the service temperature of mixing filtration granulation is 160～200 ℃, and the material after the granulation enters next step;
(3) dehydrate: the material that the previous step granulation is obtained dehydrates, and obtains intermediate;
(4) remix: the intermediate that previous step is obtained mixes with peroxide cross-linking agent, and mixing temperature is 50～90 ℃, and mixing time is 5～240min, and mixed material enters next step;
(5) post-absorption: the material that previous step is obtained carries out post-absorption, and the material behind the post-absorption enters next step;
(6) cooling: the material that previous step is obtained cools off, and obtains the peroxide crosslinked polyethylene insulating material.
2. peroxide crosslinked polyethylene insulating material post-absorption technology according to claim 1 is characterized in that: described polyethylene, oxidation inhibitor and peroxide cross-linking agent three weight ratio are 100:0.15～0.30:1.6～3.0.
3. peroxide crosslinked polyethylene insulating material post-absorption technology according to claim 1, it is characterized in that: described oxidation inhibitor is Powdered oxidation inhibitor, polyethylene is the particulate state new LDPE (film grade), and peroxide cross-linking agent is the filtering liquid peroxide cross-linking agent of process.
4. peroxide crosslinked polyethylene insulating material post-absorption technology according to claim 1 is characterized in that: described oxidation inhibitor be in No. 300 oxidation inhibitor, 1010 oxidation inhibitor, 168 oxidation inhibitor, PS802 oxidation inhibitor, 1076 oxidation inhibitor or 1035 oxidation inhibitor any.
5. peroxide crosslinked polyethylene insulating material post-absorption technology according to claim 1 is characterized in that: described peroxide cross-linking agent is any in dicumyl peroxide, two 2,5 vulcanizing agents or the dicumyl peroxide.
6. peroxide crosslinked polyethylene insulating material post-absorption technology according to claim 1 is characterized in that: the temperature during described post-absorption is 50～90 ℃, and the time of post-absorption is 3～30h.
7. peroxide crosslinked polyethylene insulating material post-absorption technology according to claim 1 is characterized in that: to be that single screw extrusion machine, twin screw extruder, two rank double-screw extruding pelletizing machine, single screw rod are reciprocating type extrude in tablets press, Banbury mixer or the milling machine any one with described mixing roll.
8. peroxide crosslinked polyethylene insulating material post-absorption technology according to claim 1 is characterized in that: the drying plant that adopts during described dehydrating is any in centrifuge, boiling-bed drying, vacuum drier or the cyclonic separator.
9. peroxide crosslinked polyethylene insulating material post-absorption technology according to claim 1 is characterized in that: the filter plant that adopts during described the filtration is filtering net or industrial strainer, and filtering the order number is 80～500 orders.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615736A (en) * | 2012-04-24 | 2012-08-01 | 昆山科信橡塑机械有限公司 | High-filling material extruding and granulating unit |
| CN102615737A (en) * | 2012-04-24 | 2012-08-01 | 昆山科信橡塑机械有限公司 | Extruder and granulator set for producing halogen-free materials by single-screw internal mixer |
| WO2018049546A1 (en) * | 2016-09-13 | 2018-03-22 | 姚伯玉 | Ultrahigh molecular weight polyethylene cable protective sheath |
| CN108285565A (en) * | 2018-01-12 | 2018-07-17 | 安徽滁州德威新材料有限公司 | Extra-high-tension cable ultra-clean processes for chemically crosslinked polyethylene Insulation Material and preparation method |
| CN109468689A (en) * | 2018-12-06 | 2019-03-15 | 长青藤高性能纤维材料有限公司 | A kind of ultra high molecular weight polyethylene fiber gel spinning method and the soft kneading machine of double ranks using the soft kneading machine of double ranks |
| EP3604398A1 (en) | 2018-08-04 | 2020-02-05 | Petkim Petrokimya Holding Anonim Sirekti | Method for producing high homogeneity crosslinkable polyethylene |
| CN112280149A (en) * | 2020-11-06 | 2021-01-29 | 南京地中缆科技有限公司 | Preparation method of high-voltage and ultrahigh-voltage cable insulating material |
| CN116199963A (en) * | 2023-03-10 | 2023-06-02 | 南京中超新材料股份有限公司 | Peroxide crosslinked polyethylene material and preparation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615736A (en) * | 2012-04-24 | 2012-08-01 | 昆山科信橡塑机械有限公司 | High-filling material extruding and granulating unit |
| CN102615737A (en) * | 2012-04-24 | 2012-08-01 | 昆山科信橡塑机械有限公司 | Extruder and granulator set for producing halogen-free materials by single-screw internal mixer |
| CN102615737B (en) * | 2012-04-24 | 2015-04-08 | 昆山科信橡塑机械有限公司 | Extruder and granulator set for producing halogen-free materials by single-screw internal mixer |
| CN102615736B (en) * | 2012-04-24 | 2015-08-05 | 昆山科信橡塑机械有限公司 | High fill material extruding pelletization unit |
| WO2018049546A1 (en) * | 2016-09-13 | 2018-03-22 | 姚伯玉 | Ultrahigh molecular weight polyethylene cable protective sheath |
| CN108285565A (en) * | 2018-01-12 | 2018-07-17 | 安徽滁州德威新材料有限公司 | Extra-high-tension cable ultra-clean processes for chemically crosslinked polyethylene Insulation Material and preparation method |
| EP3604398A1 (en) | 2018-08-04 | 2020-02-05 | Petkim Petrokimya Holding Anonim Sirekti | Method for producing high homogeneity crosslinkable polyethylene |
| CN109468689A (en) * | 2018-12-06 | 2019-03-15 | 长青藤高性能纤维材料有限公司 | A kind of ultra high molecular weight polyethylene fiber gel spinning method and the soft kneading machine of double ranks using the soft kneading machine of double ranks |
| CN112280149A (en) * | 2020-11-06 | 2021-01-29 | 南京地中缆科技有限公司 | Preparation method of high-voltage and ultrahigh-voltage cable insulating material |
| CN116199963A (en) * | 2023-03-10 | 2023-06-02 | 南京中超新材料股份有限公司 | Peroxide crosslinked polyethylene material and preparation method thereof |
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