CN102276901B - Method for preparing ultraclean crosslinkable polyethylene insulation material of high-voltage cable - Google Patents
Method for preparing ultraclean crosslinkable polyethylene insulation material of high-voltage cable Download PDFInfo
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- CN102276901B CN102276901B CN 201110201657 CN201110201657A CN102276901B CN 102276901 B CN102276901 B CN 102276901B CN 201110201657 CN201110201657 CN 201110201657 CN 201110201657 A CN201110201657 A CN 201110201657A CN 102276901 B CN102276901 B CN 102276901B
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Abstract
The invention discloses a method for preparing an ultraclean crosslinkable polyethylene insulation material of a high-voltage cable, relates to a method for preparing a crosslinkable polyethylene insulation material and solves the problems of low purity, easiness for generating gel and the phenomenon of pre-crosslinking, poor stability of product quality, low production efficiency and high cost of the current method for preparing the crosslinkable polyethylene insulation material. The method comprises the following steps of: taking raw materials; uniformly mixing polyvinyl resin and an antioxidant to obtain a material; filtering, pelletizing, dehydrating and drying the material and mixing the obtained material and a cross linking agent to obtain aggregates mixed with the cross linking agent; and feeding the aggregates into an adsorption material bin to homogenize the aggregates and cooling the obtain product to complete preparation of the crosslinkable polyethylene insulation material. In the method, the gel and the phenomenon of pre-crosslinking are not generated in the production process and equipment does not need to be shut down to be cleaned in the production, so that the production efficiency is increased and the cost is reduced. The number and the sizes of impurities in the crosslinkable polyethylene insulation material reach the level of an imported like product. Each kilogram of cable material contains less than 10 impurities of 70-100 mum and does not contain impurities of more than 100 mum. The ultraclean requirement is met. The product quality has long-term stability.
Description
Technical field
The present invention relates to a kind of preparation method of crosslinkable polyethylene Insulation Material.
Background technology
Electric wire is the key part of electric power transportation, and insulating material wherein is one of key factor that determines the cable voltage ability.Crosslinked polyethylene (XLPE) becomes the in recent years main insulating material of high-tension cable because having excellent dielectric properties and good thermotolerance, processing characteristics.
The at present production of the crosslinkable polyethylene cable material of 110kV, 220kV and above grade exists purity not up to standard, easily produces gel and precrosslink and the poor problem of constant product quality in the production process.
Name is called and has following problem in the patent of " a kind of production method of high-voltage crosslinkable polyethylene cable material (application number: 200910073453.6, applying date: on December 18th, 2009) ":
Its step 4: the melt after the filtration enters in the second Single-screw stroking kneader, weight-loss type liquid claims the crosslink agent DCP after thawing and the filtration is injected in the second Single-screw stroking kneader simultaneously, the feeding speed that weight-loss type liquid claims is per hour 10 kilograms, melt after the filtration and crosslink agent DCP are evenly mixing, melting temperature is 115 ℃, obtains containing the polyethylene of crosslink agent DCP.
(1) melt has passed through purification filtering before this step, if but raise because unexpected factor causes the mixing roll internal temperature in this step, linking agent is decomposed, precrosslink then can occur or form gel, the material cleanliness factor does not reach the relevant criterion requirement, can't be used for high-voltage cable insulating.
When (2) adopting the method to produce, the inner regional area of mixing roll may accumulate the polyethylene that contains on a small quantity linking agent.If these materials overstand in mixing roll may form gradually gel or precrosslink occurs, and enter in the finished product material, so that the material cleanliness factor does not reach the relevant criterion requirement under the effect of heat.For avoiding occurring this kind situation, the continuous production time of the method does not generally allow to surpass 7 days, must shut down after normally producing certain hour, and mixing roll is opened cleaning, and this can reduce production efficiency and increase production cost.
Summary of the invention
The objective of the invention is to exist purity low for the preparation that solves existing crosslinkable polyethylene Insulation Material, easily produce gel, precrosslink, the problem that constant product quality is poor, production efficiency is low and cost is high, and a kind of preparation method of ultraclean crosslinkable polyethylene insulation material of high-voltage cable is provided.
The preparation method of ultraclean crosslinkable polyethylene insulation material of high-voltage cable carries out according to the following steps: one, take by weighing 100 parts polyvinyl resin, 0.2～0.5 part oxidation inhibitor and 1.5～2.0 parts linking agent according to weight part;
Two, polyvinyl resin and the oxidation inhibitor that takes by weighing is joined in the mixing roll simultaneously, mixing even under temperature is 130～200 ℃, get material;
Three, material enters in the Melt Pump, Melt Pump makes streams cross double hydraulic screen replacing strainer and filters, material after the filtration enters single screw pelletizer granulation, the gained pellet cools off and is transported to through pure water and carries out centrifuge dehydration and drying treatment in the centrifuge, then be preheating to 60～90 ℃, enter again rotary drum blender mixer and insulation at 60～90 ℃, the linking agent that takes by weighing is sprayed the surface of pellet, be rotated further to the pellet surface drying, obtain to be mixed with the pellet of linking agent;
Four, the pellet that is mixed with linking agent enters absorption bin, is homogenizing 3～20h under 60～90 ℃ the condition in temperature, then is cooled to 30～50 ℃, namely finishes the preparation of ultraclean crosslinkable polyethylene insulation material of high-voltage cable;
Wherein the model of polyvinyl resin is LD200BW in the step 1; Oxidation inhibitor is four [β-(3 ', 5 '-di-t-butyl-4 '-hydroxy phenyl) propionic acid] pentaerythritol ester; Linking agent is dicumyl peroxide.
The preparation method of medium and high voltage cable super-clean cross-linkable polyethylene Insulation Material of the present invention does not produce gel and precrosslink in the production process; After testing, the quantity of impurity and size reach the level of import like product (70～100 μ m foreign matter contents are less than 10 in every kilogram of CABLE MATERIALS in the crosslinkable polyethylene Insulation Material, do not contain the impurity greater than 100 μ m), reach ultra-clean requirement, and quality product has permanent stability.
The present invention compares with existing method has following beneficial effect:
(1) polyvinyl resin and oxidation inhibitor are in mixing roll after evenly mixing, filtration, the granulation, through pure water cooling and be transported to the centrifuge that is positioned at the production line highest point, production line is fully airtight in the production process of back, do not use air to carry, the gravity by material falls step by step fully; This mode of production has been avoided the material after airborne impurity enters filtration, purification, guarantees that finished-product material has higher purity;
(2) utilize rotary drum blender mixer that linking agent (dicumyl peroxide) is tentatively diffused in the pellet (the melt blending particle of polyvinyl resin and oxidation inhibitor); The special internal structure of rotary drum blender mixer guarantees to make in it gyrates process liquid linking agent and pellet evenly to mix, and under the effect of certain temperature, spread gradually to granule interior, particle surface reaches dry within a certain period of time, and this has at first guaranteed the homogeneity of the preliminary diffusion of linking agent; The rotary drum blender mixer water jacket heats, rotates continuously and special internal structure can also guarantee that its internal temperature is even, and its inside does not have the parts of relative movement, can because friction produces localized hyperthermia, not avoid producing gel and precrosslink;
(3) after linking agent tentatively diffused into pellet, this pellet also will keep certain hour by constant temperature in absorption bin, until linking agent spreads in pellet evenly;
(4) the special internal structure of absorption bin can guarantee the pellet first outer that is mixed with linking agent of its inside, and the time of section's stop within it equates, diffusion uniformity is consistent;
(5) but long-time continuous production under normal circumstances, need not shut down cleaning in the production, improved production efficiency and reduced production cost.
Embodiment
Embodiment one: the preparation method of present embodiment ultraclean crosslinkable polyethylene insulation material of high-voltage cable carries out according to the following steps: one, take by weighing 100 parts polyvinyl resin, 0.2～0.5 part oxidation inhibitor and 1.5～2.0 parts linking agent according to weight part;
Two, polyvinyl resin and the oxidation inhibitor that takes by weighing is joined in the mixing roll simultaneously, mixing even under temperature is 130～200 ℃, get material;
Three, material enters in the Melt Pump, Melt Pump makes streams cross double hydraulic screen replacing strainer and filters, material after the filtration enters single screw pelletizer granulation, the gained pellet cools off and is transported to through pure water and carries out centrifuge dehydration and drying treatment in the centrifuge, then be preheating to 60～90 ℃, enter again rotary drum blender mixer and insulation at 60～90 ℃, the linking agent that takes by weighing is sprayed the surface of pellet, be rotated further to the pellet surface drying, obtain to be mixed with the pellet of linking agent;
Four, the pellet that is mixed with linking agent enters absorption bin, is homogenizing 3～20h under 60～90 ℃ the condition in temperature, then is cooled to 30～50 ℃, namely finishes the preparation of ultraclean crosslinkable polyethylene insulation material of high-voltage cable;
Wherein the model of polyvinyl resin is LD200BW in the step 1; Oxidation inhibitor is four [β-(3 ', 5 '-di-t-butyl-4 '-hydroxy phenyl) propionic acid] pentaerythritol ester; Linking agent is dicumyl peroxide.
Polyvinyl resin adopts dust remover and metal catcher in the present embodiment step 1, purifies respectively the surface of starting material particle and removes in the starting material metallic impurity than big scale.
Dust remover adopts the SDS series static chalk dust removal machine of Dongguan Xinyi Electro-thermal Machinery Co., Ltd, and metal catcher adopts German QUICKTRON apparatus for separating metals.
Melt Pump adopts the CHEM series Melt Pump of German Witter pump industry technology company limited in the present embodiment step 3.
Double hydraulic screen replacing strainer adopts the AJSZ series double hydraulic screen replacing strainer of Anji, Zhengzhou City chemical plastic machine works in the present embodiment step 3.
Single screw pelletizer adopts the DJ series single screw extrusion machine of Nanjing Chengmeng Plastic Mechanical Industry Co. Ltd. in the present embodiment step 3.
Double hydraulic screen replacing strainer can filter the impurity of all particle diameters in the material 〉=100 μ m in the present embodiment step 3.
Pellet is through pure water cooling and be transported in the centrifuge in the present embodiment step 3, and centrifuge herein is positioned at the production line highest point.
Rotary drum blender mixer adopts the ZGH series rotary drum blender mixer of Kazakhstan general electrical technology limited liability company in the present embodiment step 3.
Rotary drum blender mixer in the present embodiment step 3, rotating the temperature that is heated to pellet is 60～90 ℃, can guarantee that its inner pellet temperature is even, and the linking agent of spray can evenly be distributed in pellet.
The pellet that is mixed with linking agent in the present embodiment step 4 enters absorption bin, is homogenizing under 60～90 ℃ the condition in temperature, can guarantee the pellet first outer that is mixed with linking agent of its inside, and section equates time of stopping within it.
Gained ultraclean crosslinkable polyethylene insulation material of high-voltage cable after the cooling in the present embodiment, the follow-up batch blending bunker that enters, the pellet that is mixed with linking agent that enters batch blending bunker with different time is mixed in batch blending bunker again, the realization serialization is produced, and obtains large batch of ultraclean crosslinkable polyethylene insulation material of high-voltage cable.
Embodiment two: what present embodiment and embodiment one were different is to take by weighing 100 parts polyvinyl resin, 0.2 part oxidation inhibitor and 1.5 parts linking agent according to weight part in the step 1.Other step and parameter are identical with embodiment one.
Embodiment three: what present embodiment and embodiment one were different is to take by weighing 100 parts polyvinyl resin, 0.5 part oxidation inhibitor and 2.0 parts linking agent according to weight part in the step 1.Other step and parameter are identical with embodiment one.
Embodiment four: what present embodiment and embodiment one were different is to take by weighing 100 parts polyvinyl resin, 0.3 part oxidation inhibitor and 1.8 parts linking agent according to weight part in the step 1.Other step and parameter are identical with embodiment one.
Embodiment five: what present embodiment was different from one of embodiment one to four is mixing even under temperature is 130 ℃ in the step 2, gets material.Other step and parameter are identical with one of embodiment one to four.
Embodiment six: what present embodiment was different from one of embodiment one to four is mixing even under temperature is 200 ℃ in the step 2, gets material.Other step and parameter are identical with one of embodiment one to four.
Embodiment seven: what present embodiment was different from one of embodiment one to four is mixing even under temperature is 160 ℃ in the step 2, gets material.Other step and parameter are identical with one of embodiment one to four.
Embodiment eight: what present embodiment was different from one of embodiment one to seven is that mixing roll is twin-screw mixer machine or Single-screw stroking kneader in the step 2.Other step and parameter are identical with one of embodiment one to seven.
Embodiment nine: present embodiment is different from one of embodiment one to eight is that the specification of granulation in the step 3 is diameter 3.5mm, thickness 2～3.5mm.Other step and parameter are identical with one of embodiment one to eight.
Embodiment ten: present embodiment is different from one of embodiment one to nine is that each of double hydraulic screen replacing strainer is filtered the filtering net that haves three layers is installed on reticulum in the step 3.Other step and parameter are identical with one of embodiment one to nine.
Embodiment 11: what present embodiment was different from one of embodiment one to ten is that the pellet that is mixed with linking agent in the step 4 enters absorption bin, is homogenizing 20h under 60 ℃ the condition in temperature, then is cooled to 30 ℃.Other step and parameter are identical with one of embodiment one to ten.
Embodiment 12: what present embodiment was different from one of embodiment one to ten is that the pellet that is mixed with linking agent in the step 4 enters absorption bin, is homogenizing 3h under 90 ℃ the condition in temperature, then is cooled to 50 ℃.Other step and parameter are identical with one of embodiment one to ten.
Embodiment 13: what present embodiment was different from one of embodiment one to ten is that the pellet that is mixed with linking agent in the step 4 enters absorption bin, is homogenizing 10h under 80 ℃ the condition in temperature, then is cooled to 40 ℃.Other step and parameter are identical with one of embodiment one to ten.
Embodiment 14: the preparation method of present embodiment ultraclean crosslinkable polyethylene insulation material of high-voltage cable carries out according to the following steps: one, take by weighing 100 parts polyvinyl resin, 0.3 part oxidation inhibitor and 2.0 parts linking agent according to weight part;
Two, polyvinyl resin and the oxidation inhibitor that takes by weighing is joined in the mixing roll simultaneously, mixing even under temperature is 150 ℃, get material;
Three, material enters in the Melt Pump, Melt Pump makes streams cross double hydraulic screen replacing strainer and filters, material after the filtration enters single screw pelletizer granulation, the gained pellet cools off and is transported to through pure water and carries out centrifuge dehydration and drying treatment in the centrifuge, then be preheating to 80 ℃, enter again rotary drum blender mixer and insulation at 80 ℃, the linking agent that takes by weighing is sprayed the surface of pellet, be rotated further to the pellet surface drying, obtain to be mixed with the pellet of linking agent;
Four, the pellet that is mixed with linking agent enters absorption bin, is homogenizing 10h under 80 ℃ the condition in temperature, then is cooled to 40 ℃, namely finishes the preparation of ultraclean crosslinkable polyethylene insulation material of high-voltage cable;
Wherein the model of polyvinyl resin is LD200BW in the step 1; Oxidation inhibitor is four [β-(3 ', 5 '-di-t-butyl-4 '-hydroxy phenyl) propionic acid] pentaerythritol ester; Linking agent is dicumyl peroxide.
Preparation gained ultraclean crosslinkable polyethylene insulation material of high-voltage cable does not produce gel and precrosslink in the present embodiment in the production process; After testing, the quantity of impurity and size reach the level of import like product (70～100 μ m foreign matter contents are less than 10 in every kilogram of CABLE MATERIALS in the crosslinkable polyethylene Insulation Material, do not contain the impurity greater than 100 μ m), reach ultra-clean requirement, and quality product has permanent stability.
Claims (7)
1. the preparation method of a ultraclean crosslinkable polyethylene insulation material of high-voltage cable is characterized in that the preparation method of ultraclean crosslinkable polyethylene insulation material of high-voltage cable carries out according to the following steps: one, take by weighing 100 parts polyvinyl resin, 0.2～0.5 part oxidation inhibitor and 1.5～2.0 parts linking agent according to weight part;
Two, polyvinyl resin and the oxidation inhibitor that takes by weighing is joined in the mixing roll simultaneously, mixing even under temperature is 130～200 ℃, get material;
Three, material enters in the Melt Pump, Melt Pump makes streams cross double hydraulic screen replacing strainer and filters, material after the filtration enters single screw pelletizer granulation, the gained pellet cools off and is transported to the centrifuge that is positioned at the production line highest point through pure water and carries out centrifuge dehydration and drying treatment, then be preheating to 60～90 ℃, enter again rotary drum blender mixer and insulation at 60～90 ℃, the linking agent that takes by weighing is sprayed the surface of pellet, be rotated further to the pellet surface drying, obtain to be mixed with the pellet of linking agent;
Four, the pellet that is mixed with linking agent enters absorption bin, is homogenizing 3～20h under 60～90 ℃ the condition in temperature, then is cooled to 30～50 ℃, namely finishes the preparation of ultraclean crosslinkable polyethylene insulation material of high-voltage cable;
Wherein the model of polyvinyl resin is LD200BW in the step 1; Oxidation inhibitor is four [β-(3 ', 5 '-di-t-butyl-4 '-hydroxy phenyl) propionic acid] pentaerythritol ester; Linking agent is dicumyl peroxide.
2. the preparation method of a kind of ultraclean crosslinkable polyethylene insulation material of high-voltage cable according to claim 1 is characterized in that taking by weighing 100 parts polyvinyl resin, 0.3 part oxidation inhibitor and 1.8 parts linking agent according to weight part in the step 1.
3. the preparation method of a kind of ultraclean crosslinkable polyethylene insulation material of high-voltage cable according to claim 1 and 2, it is characterized in that in the step 2 temperature be 160 ℃ lower mixing evenly, get material.
4. the preparation method of a kind of ultraclean crosslinkable polyethylene insulation material of high-voltage cable according to claim 1 is characterized in that mixing roll is twin-screw mixer machine or Single-screw stroking kneader in the step 2.
5. the preparation method of a kind of ultraclean crosslinkable polyethylene insulation material of high-voltage cable according to claim 1, the specification that it is characterized in that granulation in the step 3 is diameter 3.5mm, thickness 2～3.5mm.
6. the preparation method of a kind of ultraclean crosslinkable polyethylene insulation material of high-voltage cable according to claim 1, each that it is characterized in that double hydraulic screen replacing strainer in the step 3 is filtered the filtering net that haves three layers is installed on reticulum.
7. according to claim 1, the preparation method of 2,4,5 or 6 described a kind of ultraclean crosslinkable polyethylene insulation material of high-voltage cables, it is characterized in that the pellet that is mixed with linking agent in the step 4 enters absorption bin, be homogenizing 10h under 80 ℃ the condition in temperature, then be cooled to 30 ℃.
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| CN102636511B (en) * | 2012-05-18 | 2015-05-13 | 哈尔滨理工大学 | Test method of optimal cross-linking agent diffusion time in production process of high-voltage cable material |
| CN103319774B (en) * | 2013-07-01 | 2015-08-26 | 哈尔滨理工大学 | Crosslinkable inorganic nano LDPE/SiOx polymer composites |
| CN106003462B (en) * | 2016-08-05 | 2019-03-26 | 浙江万马高分子材料有限公司 | For ultra-clean high voltage power cable insulating materials direct method production process and device |
| CN106346624A (en) * | 2016-09-26 | 2017-01-25 | 高团结 | Production method of high-voltage crosslinkable polyethylene cable material |
| CN107383538A (en) * | 2017-08-10 | 2017-11-24 | 全球能源互联网研究院 | High voltage direct current cable high-dispersion nano composite ultra-clean Insulation Material and preparation method thereof |
| CN107973961B (en) * | 2017-12-08 | 2020-07-17 | 广东技塑新材料股份有限公司 | Micro-crosslinked super-stress cracking resistant halogen-free flame-retardant polyolefin composite material and preparation method thereof |
| 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 |
| CN108623877A (en) * | 2018-04-17 | 2018-10-09 | 全球能源互联网研究院有限公司 | A kind of high voltage direct current cable insulating materials and preparation method thereof |
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| CN1306523C (en) * | 2004-12-03 | 2007-03-21 | 宋鸿文 | Method for production of 110KV class XLPE cable insulation material |
| CN101456985B (en) * | 2007-12-12 | 2011-12-28 | 青岛汉缆股份有限公司 | Method for producing super-clean cross-linkable polyethylene insulation material |
| CN101733855B (en) * | 2009-12-18 | 2012-02-15 | 哈尔滨理工大学 | Method for producing high-voltage crosslinkable polyethylene cable material |
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