CN102120842A - 35kV-below water-tree retardant crosslinked polyethylene insulating material and preparation method thereof - Google Patents
35kV-below water-tree retardant crosslinked polyethylene insulating material and preparation method thereof Download PDFInfo
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- CN102120842A CN102120842A CN2011100237475A CN201110023747A CN102120842A CN 102120842 A CN102120842 A CN 102120842A CN 2011100237475 A CN2011100237475 A CN 2011100237475A CN 201110023747 A CN201110023747 A CN 201110023747A CN 102120842 A CN102120842 A CN 102120842A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a 35kV-below water-tree retardant crosslinked polyethylene insulating material and a preparation method thereof. The insulating material is prepared from 100 parts of polyethylene, 1.8-3.0 parts of composite crosslinking agent, 1-4 parts of nano montmorillonite, 0.1-0.5 part of initiator, 0.5-1.2 parts of antioxidant and 0.1-2.0 parts of processing assistant. The insulating material disclosed by the invention has better comprehensive properties than DCP (dicumyl peroxide), and reduces the generation of water trees.
Description
Technical field
The invention belongs to field of high polymer material processing, be specifically related to a kind of insulating material and preparation method thereof.
Background technology
Crosslinked polyethylene (XLPE) cable is with its excellent electric property and transmission capacity is big, resistance toheat is good, be easy to bending, attachment tab simple, install and lay advantages such as convenient, be popular in users, become the main flow of power cable from last century since the eighties gradually.At home, the failure rate of the following power cable with cross-linked polyethylene insulation of 35KV of calipers obviously rose in recent years, indivedual areas and unit even comparatively serious, and the cable body cause faults is the early stage damage that the water tree causes.Especially be installed in the cable in the southern wet environment, the water tree is taken place very general, indivedual serious branch length are near 70% of insulation thickness, increasing cable user and cables manufacturing factory have realized that, must take measures, avoid early and suppress the trend that water tree causes cable bad to rise.
Summary of the invention
The objective of the invention is to finish work-ing life too early, a kind of following anti-water tree cross-inked polyethylene power cable insulating material of novel 35KV that water tree produces that delays is provided in order to overcome the twisted polyethylene cable that causes because of the water tree.
Another object of the present invention provides a kind of preparation method of above-mentioned insulating material.
Purpose of the present invention can reach by following measure:
The following anti-water tree crosslinked polyethylene insulation material of a kind of 35KV, this insulating material is made by the component of following weight part:
100 parts of polyethylene
1.8～3.0 parts of multiple crosslinking agents
1～4 part of nano imvite
0.1～0.5 part of initiator
0.5～1.2 part in oxidation inhibitor
0.1～2.0 part of processing aid;
Wherein said multiple crosslinking agent is 2,5-2 and 2,5-dimethyl-2,5-two (t-butylperoxy) hexin mixture.Described multiple crosslinking agent 2,5-2 and 2,5-dimethyl-2, the mass ratio of 5-two (t-butylperoxy) hexin is 3～7: 7～3.
Polyethylene is selected from least a in new LDPE (film grade), linear low density polyethylene and the ethylene-vinyl acetate copolymer; The melt flow rate (MFR) of described new LDPE (film grade) is 2.1～2.9g/10min, density 0.920～0.925g/cm3, degree of cleaning≤10/kg.
Nano imvite is meant the layer silicate of length below 100nm.The silicate polynite of concrete laminate structure, every layer heavily contains an alumina octahedral by two silicon-oxy tetrahedrons and constitutes, the about 1nm of bed thickness, length is 100nm.Residual electric charge on the sheet evenly spreads in the polyethylene form layers inserting structure by being positioned at the receiving of interlayer, calcium, magnesium cation balance.
Initiator of the present invention is selected from least a in dibenzoyl peroxide, Diisopropyl azodicarboxylate or the POTASSIUM PERSULFATE.Oxidation inhibitor is four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester (antioxidant 1010), three [2.4-di-tert-butyl-phenyl] phosphorous acid ester (oxidation inhibitor 168) or 1, two (3, the 5-di-t-butyl-4-hydroxyl-phenylpropionic acid) hydrazines (oxidation inhibitor 1024) of 2-.Processing aid is selected from least a in polyethylene wax, paraffin, polyvinylidene difluoride (PVDF), stearate or the di-sec-octyl phthalate.
The preparation method of insulating material of the present invention is: earlier polyethylene, multiple crosslinking agent and nano imvite are carried out banburying, add oxidation inhibitor, initiator and processing aid again and continue banburying, carry out extruding pelletization at last.
The concrete preparation method of the following anti-water tree cross-inked polyethylene power cable insulating material of 35KV of the present invention comprises the steps:
(1) polyethylene, multiple crosslinking agent and nano imvite are added successively carry out banburying in the Banbury mixer, the Banbury mixer rotating speed is 20～30rpm, 120～130 ℃ of temperature, time 2～4min; With closed-smelting machine rotor speed governing to 30～50rpm, add oxidation inhibitor, initiator and processing aid then, continue banburying 1～2min;
(2) the banburying material is added single screw extruder pelletizer and carry out granulation, the length-to-diameter ratio of described single screw extrusion machine≤25, rotating speed 30～50rpm, 110～130 ℃ of temperature.The material of extruding from single screw extruder pelletizer can directly feed and carry out moulding the forming mould, is provided with seat type net between single screw extrusion machine and forming materials mould, and promptly the impurities of materials before the forming materials is filtered and adopted seat type net.
Wherein the consumption of each component and definition are as mentioned above.
Polyethylene and various additive between two counter-rotational rotors of Banbury mixer, between rotor and banburying chamber, are subjected to compulsory shearing, stirring, extruding and kneading, the mixing plasticizing of thermally equivalent in banburying chamber.Because the closed-smelting machine rotor rotating speed is not high, friction, to shear temperature rise less, and resin is stressed, intensifications is even, does not have the local pyrexia phenomenon to take place, and guarantees that material is mixing even, does not take place again to degrade and precrosslink.Facts have proved that Banbury mixer is to make the best premixing device of the anti-water tree cross-inked polyethylene power cable Insulation Material of 35KV.Because the resin after banburying reaches the technical requirements of cable material preparation fully.Just finish required profile with the single screw extrusion machine granulation, use with the current supply cable producer.Because it does not need hot-melt resin; do not need the blend of resin and additive again; just low to the technical requirements of single screw extrusion machine like this: as length-to-diameter ratio≤25 of screw rod; pitch is big, compression ratio is little; the cost of forcing machine and production energy consumption reduce greatly like this; bad technogenic influence is minimum; filtering net is installed and is changed filtering net convenient and swift; rectifying column plate through-hole rate height (total area of spreader plate eyelet is greater than 50% of the spreader plate total area); output is big; as produce when shutting down, material is residual few in the single screw extrusion machine, is beneficial to cleaning.
Oxidation inhibitor that the present invention is used and processing aid all are the technology that well known to a person skilled in the art, can be used.To be these auxiliary agents do not have a negative impact to the realization and the obtaining of excellent results of the present invention of the object of the invention its precondition.
The present invention has following advantage:
The present invention first with physical condition, storage stability is good and security is good, transformation period high slightly 2,5 dimethyl 2,5-two (tert-butyl peroxy base) hexin (AD), 2,5 dimethyl 2,5-two (tert-butyl peroxy base) hexin (YD) is compound peroxide cross-linking agent, replaces the traditional dicumyl peroxide that pungent peculiar smell is arranged (DCP) linking agent.Practice shows that their synergistic effect effect not only is better than DCP greatly on over-all properties, but also has reduced the generation of " water tree " when adopting AD and YD linking agent to be used.
2. utilize homemade Banbury mixer single screw extrusion machine granulation unit to melt extrude granulation through row.Because Banbury mixer rotating speed not high (20-40rpm), friction, shearing heat up less, and resin is stressed, intensification is even, do not have the local pyrexia phenomenon to take place, and guarantee that promptly material is mixing evenly, and degraded and precrosslink can not take place again.Single screw extrusion machine simplicity of design, firm reliable, plasticizing steadily, shearing friction heat up little, with satisfied performance to guarantee the precrosslink and the exterior of commodity of CABLE MATERIALS minimum.
3. adopt pre-mixing technology.New LDPE (film grade) material grain, compound linking agent, nano imvite carry out banburying in Banbury mixer, because multiple crosslinking agent is liquid, closed-smelting machine rotor evenly mixes, by Intermolecular Forces, and the sticking action of linking agent between polyethylene and polynite.Liquid linking agent is sticked to the polyethylene particle surface by grinding uniformly.Material is very fast at the volley because of mutually the friction of motion and the Banbury mixer indirect heating of collision and material and pot wall and stirring rotator are warmed up to 108-115 ℃ of softening temperature rapidly between particle, processing aids such as oxidation inhibitor are added in proportion carry out the short period of time stirring at low speed in the Banbury mixer, the blend that all resins, auxiliary agent are realized ideal.
4. be that the combination filtering net of safeguard protection filters out impurities with seat type net.The present invention select by the pre-filtering coarse net; smart safety filtering system of filtering fine-structure mesh, protection seat type net three parts composition; the impurity of the influential electrical property of institute that can remove in the raw material, produce in transportation and the production process can ensure again when producing and cause the potentially dangerous of scoring a goal because of the melt pressure rising of the blocked gradually back of filtering net.
Description of drawings
Fig. 1 is XRD (X-ray diffraction) figure of polyethylene/montmorillonite matrix material and Meng Tuo soil;
Among the figure, the matrix material of a-embodiment 1 gained, b-polynite.By XRD as can be seen, characterizing the diffraction peak of covering the native sheet interlayer spacing of holder in the matrix material moves to Small angle, and the intensity disperse is tending towards disappearing, and shows that cheating engaging layer has taken place to peel off, promptly cover the native lamella of holder with the secondary particle form random distribution of monolithic layer and intercalation in the polyethylene matrix.
Fig. 2 is TEM (transmission electron microscope) photo of polyethylene/montmorillonite matrix material; Wherein left side figure is the laminate structure of nano imvite, and right figure is the laminate structure of nano imvite in the polyethylene.
Fig. 3 is a new LDPE (film grade) torque flow varied curve;
Fig. 4 is 3% nano montmorillonite modified cross-link low-density polyethylene torque flow varied curve;
Fig. 5 is common crosslinked polyethylene (left side) and the water tree growth comparison diagram of embodiment 1 anti-water tree crosslinked polyethylene (right side) after 30 days.
Embodiment
Below by embodiment the present invention is carried out concrete description; be necessary that again this is pointed out that present embodiment only is used for that the present invention is further described; can not be interpreted as the restriction of protection domain of the present invention, the person skilled in the art in this field can make some nonessential improvement and adjustment according to the content of foregoing invention.
1, with 100 parts of new LDPE (film grade)s (melt flow rate (MFR) 2.1～2.9g/10min, density 0.920～0.925g/cm
3, degree of cleaning≤10/kg), 1.2 part 2,5 dimethyl 2,5-two (tert-butyl peroxy base) hexane and 0.6 part of 2,5 dimethyl 2,5-two (tert-butyl peroxy base) hexin, it is 20rpm that 1 part of nano imvite adds the closed-smelting machine rotor rotating speed, mix 2min in temperature 120-130 ℃ the Banbury mixer, then the closed-smelting machine rotor rotating speed is adjusted to 30rpm and adds 0.5 part of four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester oxidation inhibitor, 0.2 part Benzoyl Peroxide, 0.1 part of polyvinylidene difluoride (PVDF) is at mixed 2min.
2, the material that above-mentioned banburying is mixed is poured hopper into, in the hopper conveyor track rises to the feed chute of single screw extrusion machine, by two wrists material is forced to be pressed into single screw rod extruding pelletization, the length-to-diameter ratio of single screw extrusion machine≤25, rotating speed 30rpm, temperature 110-130 ℃, the granulation in temperature 120-130 ℃ single screw extrusion machine of the mixture of preparation obtains the following anti-water tree cross-inked polyethylene power cable Insulation Material of 35KV.
Embodiment 2
1, with 100 parts of linear low density polyethylene, 1.0 part 2,5 dimethyl 2,5-two (tert-butyl peroxy base) hexane and 0.9 part 2,5 dimethyl 2,5-two (tert-butyl peroxy base) hexin, it is 25rpm that 3 parts of nano imvites add the closed-smelting machine rotor rotating speed, mix 3min in temperature 120-130 ℃ the Banbury mixer, then the closed-smelting machine rotor rotating speed is adjusted to 40rpm and adds 1.0 part of four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester oxidation inhibitor, 0.3 part of Diisopropyl azodicarboxylate, 0.2 part of polyethylene wax is at mixed 2min.
2, the material that above-mentioned banburying is mixed is poured hopper into, in the hopper conveyor track rises to the feed chute of single screw extrusion machine, by two wrists material is forced to be pressed into single screw rod extruding pelletization, the length-to-diameter ratio of single screw extrusion machine≤25, rotating speed 30rpm, temperature 110-130 ℃, the granulation in temperature 120-130 ℃ single screw extrusion machine of the mixture of preparation obtains the following anti-water tree cross-inked polyethylene power cable Insulation Material of 35KV.Checking its 10 sky and water tree length by ASTM D6097-97a is 79.9 μ m.
Adopt common twisted polyethylene cable to carry out performance test respectively, result such as following table with the anti-water tree cross-inked polyethylene power cable insulating material of XLPE material and the embodiment of the invention 1 gained:
The anti-water tree of table 1.35KV cross-inked polyethylene power cable Insulation Material performance test results
Claims (9)
1. the following anti-water of 35KV is set crosslinked polyethylene insulation material, it is characterized in that this insulating material is made by the component of following weight part:
100 parts of polyethylene
1.8～3.0 parts of multiple crosslinking agents
1～4 part of nano imvite
0.1～0.5 part of initiator
0.5～1.2 part in oxidation inhibitor
0.1～2.0 part of processing aid;
Wherein said multiple crosslinking agent is 2,5-2 and 2,5-dimethyl-2,5-two (t-butylperoxy) hexin mixture.
2. the following anti-water tree crosslinked polyethylene insulation material of 35KV according to claim 1, it is characterized in that described multiple crosslinking agent 2,5-2 and 2,5-dimethyl-2, the mass ratio of 5-two (t-butylperoxy) hexin is 3～7: 7～3.
3. the following anti-water tree crosslinked polyethylene insulation material of 35KV according to claim 1 is characterized in that described polyethylene is selected from least a in new LDPE (film grade), linear low density polyethylene and the ethylene-vinyl acetate copolymer; The melt flow rate (MFR) of described new LDPE (film grade) is 2.1～2.9g/10min, density 0.920～0.925g/cm
3, degree of cleaning≤10/kg.
4. the following anti-water tree crosslinked polyethylene insulation material of 35KV according to claim 1 is characterized in that described nano imvite is meant the layer silicate of length below 100nm.
5. the following anti-water tree crosslinked polyethylene insulation material of 35KV according to claim 1 is characterized in that described initiator is selected from least a in dibenzoyl peroxide, Diisopropyl azodicarboxylate or the POTASSIUM PERSULFATE.
6. the following anti-water tree crosslinked polyethylene insulation material of 35KV according to claim 1, it is characterized in that described oxidation inhibitor is four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, three [2.4-di-tert-butyl-phenyl] phosphorous acid ester or 1, two (3, the 5-di-t-butyl-4-hydroxyl-phenylpropionic acid) hydrazines of 2-.
7. the following anti-water tree crosslinked polyethylene insulation material of 35KV according to claim 1 is characterized in that described processing aid is selected from least a in polyethylene wax, paraffin, polyvinylidene difluoride (PVDF), stearate or the di-sec-octyl phthalate.
8. the following anti-water tree crosslinked polyethylene insulation material of 35KV according to claim 1, the preparation method who it is characterized in that this insulating material is: earlier polyethylene, multiple crosslinking agent and nano imvite are carried out banburying, add oxidation inhibitor, initiator and processing aid again and continue banburying, carry out extruding pelletization at last.
9. the preparation method of the following anti-water tree crosslinked polyethylene insulation material of arbitrary described 35KV in the claim 1～8 is characterized in that comprising the steps:
(1) polyethylene, multiple crosslinking agent and nano imvite are added successively carry out banburying in the Banbury mixer, the Banbury mixer rotating speed is 20～30rpm, 120～130 ℃ of temperature, time 2～4min; With closed-smelting machine rotor speed governing to 30～50rpm, add oxidation inhibitor, initiator and processing aid then, continue banburying 1～2min;
(2) the banburying material is added single screw extruder pelletizer and carry out granulation, the length-to-diameter ratio of described single screw extrusion machine≤25, rotating speed 30～50rpm, 110～130 ℃ of temperature.
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| CN2011100237475A CN102120842A (en) | 2010-09-15 | 2011-01-21 | 35kV-below water-tree retardant crosslinked polyethylene insulating material and preparation method thereof |
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| CN201010281493.2 | 2010-09-15 | ||
| CN2011100237475A CN102120842A (en) | 2010-09-15 | 2011-01-21 | 35kV-below water-tree retardant crosslinked polyethylene insulating material and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103756083A (en) * | 2013-12-10 | 2014-04-30 | 芜湖佳诚电子科技有限公司 | Nano-montmorillonite-modified polyethylene cable material and preparation method thereof |
| WO2014075726A1 (en) * | 2012-11-15 | 2014-05-22 | Abb Research Ltd | Chemically cross-linked polyethylene used for electrical insulation |
| CN104861269A (en) * | 2015-05-18 | 2015-08-26 | 常熟市中联光电新材料有限责任公司 | Medium-voltage water-tree-retardant crosslinked polyethylene cable material and preparation method thereof |
| CN105111564A (en) * | 2015-08-31 | 2015-12-02 | 无锡市嘉邦电力管道厂 | Water tree resistant cross-linked polyethylene (XLPE) insulating material used below 35KV and preparation method thereof |
| CN106349552A (en) * | 2016-08-26 | 2017-01-25 | 江苏德威新材料股份有限公司 | Water-tree-retardant semiconductive shielding material and preparation method thereof |
| CN107698277A (en) * | 2017-09-30 | 2018-02-16 | 望江县中山新型建材有限公司 | A kind of method that high-strength sintered brick is prepared using diatomite |
-
2011
- 2011-01-21 CN CN2011100237475A patent/CN102120842A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014075726A1 (en) * | 2012-11-15 | 2014-05-22 | Abb Research Ltd | Chemically cross-linked polyethylene used for electrical insulation |
| CN103756083A (en) * | 2013-12-10 | 2014-04-30 | 芜湖佳诚电子科技有限公司 | Nano-montmorillonite-modified polyethylene cable material and preparation method thereof |
| CN104861269A (en) * | 2015-05-18 | 2015-08-26 | 常熟市中联光电新材料有限责任公司 | Medium-voltage water-tree-retardant crosslinked polyethylene cable material and preparation method thereof |
| CN105111564A (en) * | 2015-08-31 | 2015-12-02 | 无锡市嘉邦电力管道厂 | Water tree resistant cross-linked polyethylene (XLPE) insulating material used below 35KV and preparation method thereof |
| CN106349552A (en) * | 2016-08-26 | 2017-01-25 | 江苏德威新材料股份有限公司 | Water-tree-retardant semiconductive shielding material and preparation method thereof |
| CN106349552B (en) * | 2016-08-26 | 2018-03-02 | 江苏德威新材料股份有限公司 | A kind of water resistant tree semi-conductive shielding material and preparation method thereof |
| CN107698277A (en) * | 2017-09-30 | 2018-02-16 | 望江县中山新型建材有限公司 | A kind of method that high-strength sintered brick is prepared using diatomite |
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Application publication date: 20110713 |