CN113045811A - One-step ultraviolet crosslinked polyethylene cable insulation and preparation method thereof - Google Patents
One-step ultraviolet crosslinked polyethylene cable insulation and preparation method thereof Download PDFInfo
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- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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Abstract
The invention discloses a one-step ultraviolet light crosslinking polyethylene cable insulation and a preparation method thereof, wherein 100 parts of polyethylene resin, 5-15 parts of syndiotactic polypropylene, 0.2-2 parts of rheological master batch, 1-3 parts of photoinitiator, 1-3 parts of auxiliary crosslinking agent and 0.1-0.5 part of antioxidant are uniformly mixed according to parts by weight, directly extruded by a cable insulation extruding machine, and then melted and coated on the surface of a cable conductor to form cable insulation, and the molten cable insulation is crosslinked by ultraviolet light irradiation. The syndiotactic polypropylene is creatively adopted, the polyethylene resin and the syndiotactic polypropylene are ingeniously combined, the problem that the heat aging strength change rate of a finished product is unqualified is solved, the tensile strength of a cable insulation material is greater than 20MPa, and the elongation at break is higher than 600%; through a 135 ℃ x 168h thermal aging experiment, the change rate of the tensile strength and the elongation at break is less than +/-15%; the thermal extension is within 80 percent under the insulation load at 200 ℃, and the comprehensive insulation performance is excellent.
Description
Technical Field
The invention belongs to the technical field of preparation of polyethylene cable insulation materials, and particularly relates to one-step ultraviolet light crosslinked polyethylene cable insulation and a preparation method thereof.
Background
In recent years, the ultraviolet light crosslinking method is improved and optimized by a professor team of the university of Chinese science and technology Qu Bao, and the ultraviolet light crosslinking process is greatly developed. Compared with the currently common silane crosslinked polyethylene, the ultraviolet crosslinked polyethylene has the advantages that the ultraviolet crosslinking process is extrusion molding and crosslinking, and does not need warm water crosslinking required by silane crosslinking and related procedures such as rewinding, so that a large amount of energy consumption is saved, the cable production efficiency is improved, and attention and attempts of cable manufacturing enterprises are obtained once the ultraviolet crosslinked polyethylene is released.
The published patent, literature and other data show that cable material enterprises generally produce respective ultraviolet light crosslinked polyethylene materials in the market, and then cable manufacturing enterprises take the produced ultraviolet light crosslinked polyethylene materials for extrusion molding. In this process, the production and use of the UV-crosslinked polyethylene material are separated independently. Because a large amount of low-molecular-weight photoinitiators and auxiliary crosslinking agents are used in a formula system of the ultraviolet crosslinking material, and because the auxiliary agents have small molecular weight and low flash point, the low-molecular-weight photoinitiators and the auxiliary crosslinking agents are bound to be heated and escape from the system to the air in the independent production process of the ultraviolet crosslinking material, so that the environmental pollution is caused, and in order to achieve a good crosslinking effect, the auxiliary agents are bound to be additionally used to fill the loss of the escape part, so that the cost is increased.
On the other hand, long-term use verification shows that the problem that the tensile strength change rate of the ultraviolet crosslinking polyethylene insulating material provided by a plurality of cable material enterprises on the market is unqualified after the insulating layer is aged is often caused after the ultraviolet crosslinking polyethylene insulating material is used, and the ultraviolet crosslinking polyethylene insulating material is more obvious when extruded at a high speed for paying off. The reason why the phenomenon is caused is analyzed that the ultraviolet crosslinking material is fused and coated on the surface of the conductor and then is rapidly crosslinked through ultraviolet irradiation, a large amount of thermal stress is accumulated in the material in the process, but the thermal stress is not fully released, so that the tensile strength of the insulating layer before aging is unstable, and the change rate of the tensile strength after aging is unqualified. In the existing common silane crosslinking process, due to the process of boiling warm water at high temperature for several hours after extrusion molding, the heat stress accumulated in the material can be well released, so that similar phenomena can not occur.
Based on the above background, the development of an ultraviolet light crosslinked polyethylene insulation formula capable of meeting the performance of the insulation material of the high-speed extrusion molding process of cable enterprises and a production and use process adapted to the ultraviolet light crosslinked polyethylene insulation formula are the key points of research of the invention.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a one-step method ultraviolet crosslinking polyethylene cable insulation and a preparation method thereof.
In order to achieve the purpose and achieve the technical effect, the invention adopts the technical scheme that:
the one-step ultraviolet crosslinking polyethylene cable insulation comprises the following components in parts by weight:
furthermore, the rheological master batch is an organic fluorine processing aid material.
Further, the photoinitiator is selected from one or more compounds of benzoin dimethyl ether, acyl phosphorus oxide photoinitiators, benzophenone photoinitiators, bibenzoyl, and 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide (abbreviated as TPO).
Further, the auxiliary crosslinking agent is selected from at least one of trimethylolpropane trimethacrylate (abbreviated as TMPTMA in English), triallylisocyanurate (abbreviated as TAIC in English), triallyl cyanurate (abbreviated as TAC in English), and trimethylolpropane triacrylate (abbreviated as TMPTA in English).
Further, the antioxidant is selected from at least one of antioxidant model 1010, 300 and DLTP.
Further, the polyethylene resin is one or a combination of a plurality of low-density polyethylene, high-density polyethylene, linear low-density polyethylene and medium-density polyethylene, and the comprehensive melt index of the combined polyethylene resin is 1.5-4 g/10 min.
Further, the syndiotactic polypropylene has a syndiotactic degree of 0.8-0.9 and a melting point of 125-140 ℃.
The invention discloses a preparation method of one-step ultraviolet light crosslinked polyethylene cable insulation, which comprises the following steps:
according to parts by weight, 100 parts of polyethylene resin, 5-15 parts of syndiotactic polypropylene, 0.2-2 parts of rheological master batch, 1-3 parts of photoinitiator, 1-3 parts of auxiliary crosslinking agent and 0.1-0.5 part of antioxidant are put into a high mixing pot and are uniformly mixed, then the mixture is fed into a feeding hopper of a cable insulation plastic extruding machine and is directly extruded by the cable insulation plastic extruding machine, then the cable insulation is formed by melting and coating on the surface of a cable conductor, and the molten cable insulation is irradiated by UV-LED ultraviolet irradiation equipment to obtain crosslinking; the tensile strength of the obtained one-step ultraviolet crosslinking polyethylene cable insulation material is more than 20MPa, and the elongation at break is more than 600%; through a 135 ℃ x 168h thermal aging experiment, the change rate of the tensile strength and the elongation at break is less than +/-15%; thermal extension at 200 ℃ under insulating load is within 80%.
Further, the temperature of each zone of the cable insulation extruder is controlled to be 120-230 ℃.
Further, the temperatures of the zones of the cable insulation extruder are as follows: 150 ℃ in the fuselage 1 region, 160 ℃ in the fuselage 2 region, 170 ℃ in the fuselage 3 region, 180 ℃ in the fuselage 4 region and 190 ℃ in the fuselage 5 region; a flange is 200 ℃; zone 1 of the handpiece 210 deg.C, zone 2 of the handpiece 220 deg.C, and zone 3 of the handpiece 230 deg.C.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, ultraviolet crosslinking is carried out by adopting a one-step method in the cable insulation plastic extruding machine, and the components in the formula are mixed and then subjected to extrusion and crosslinking integration, so that the problems of auxiliary agent volatilization by heating, environmental pollution, cost increase and the like in the independent production process of the ultraviolet crosslinking material in the prior art are avoided; in the formula design, syndiotactic polypropylene is initiatively adopted, polyethylene resin and the syndiotactic polypropylene are ingeniously combined, the characteristics of high flexibility and high toughness of the syndiotactic polypropylene are fully exerted, the compounding of the syndiotactic polypropylene and the polyethylene resin reduces the accumulation of thermal stress in the insulating extrusion coating process, so that the problem of unqualified thermal aging strength change rate of a finished product is solved, the molten cable insulation under high-speed paying-off is subjected to irradiation crosslinking by UV-LED ultraviolet light irradiation equipment, the tensile strength of the obtained cable insulation material is greater than 20MPa, and the elongation at break is higher than 600%; through a 135 ℃ x 168h thermal aging experiment, the change rate of the tensile strength and the elongation at break is less than +/-15%; the thermal extension is within 80 percent under the insulation load at 200 ℃, the comprehensive insulation performance is excellent, and the method is suitable for industrial popularization and use.
Detailed Description
The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and thus the scope of the present invention can be clearly and clearly defined.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
Example 1
A preparation method of one-step ultraviolet light crosslinked polyethylene cable insulation comprises the following steps:
according to the weight portion, low density polyethylene LDPE 2420H 50 portion, linear low density polyethylene LLDPE 704250 portion, syndiotactic polypropylene 10 portion (syndiotactic degree: 0.85, melting point 130 ℃), rheological master batch 1 portion, benzophenone 2 portion, triallyl cyanurate TAC 1.5 portion and antioxidant 10100.2 portion are added into a high-speed mixing pot, mixed for 5min at low speed, mixed uniformly and then put into a feeding hopper of a cable insulation plastic extruding machine, and then directly melted and extruded by the cable insulation plastic extruding machine and coated on 70mm2The surface of the conductor wire core is subjected to paying-off speed of 80m/min and then is subjected to irradiation crosslinking by a UV-LED ultraviolet irradiation device.
Example 2
A preparation method of one-step ultraviolet light crosslinked polyethylene cable insulation comprises the following steps:
according to the weight portion, the LDPE 2420H 80 portion, the LLDPE 832020 portion, the syndiotactic polypropylene 8 portion (the syndiotactic degree is 0.8 and the melting point is 125 ℃), the rheological master batch 1 portion, the photoinitiator 6511.4 portion, the TAIC 2.5 portion and the antioxidant 10100.3 portion are added into a high-speed mixing pot, the materials are evenly mixed at a low speed for 5min, then the mixture is put into a feeding hopper of a cable insulation plastic extruding machine, and the mixture is directly melted and extruded by the cable insulation plastic extruding machine and is coated on a 70mm thick film2The surface of the conductor wire core is subjected to paying-off speed of 80m/min and then is subjected to irradiation crosslinking by a UV-LED ultraviolet irradiation device.
The same as in example 1.
Example 3
A preparation method of one-step ultraviolet light crosslinked polyethylene cable insulation comprises the following steps:
according to the weight portion, 704280 portions of LLDPE, 252010 portions of MDPE, 15 portions of syndiotactic polypropylene (syndiotactic degree: 0.85, melting point 130 ℃), 0.8 portion of rheological master batch, 1.5 portions of dimethyl benzophenone, 2 portions of TMPTMA, 10100.1 portions of antioxidant and 0.1 portion of antioxidant DLTP are added into a high-speed mixing pot, mixed uniformly for 5min at low speed and then put into a feeding hopper of a cable insulation extruding machine, and directly melted and extruded by the cable insulation extruding machine and coated on 70mm2The surface of the conductor wire core is subjected to paying-off speed of 80m/min and then is subjected to irradiation crosslinking by a UV-LED ultraviolet irradiation device.
The same as in example 1.
Example 4
A preparation method of one-step ultraviolet light crosslinked polyethylene cable insulation comprises the following steps:
according to the weight portion, adding 100 portions of LLDPE 35B, 12 portions of syndiotactic polypropylene (syndiotactic degree: 0.9, melting point 140 ℃), 0.8 portion of rheological master batch, 1 portion of TPO, 2 portions of TAIC and 3000.2 portions of antioxidant into a high-speed mixing pot, uniformly mixing for 5min at low speed, then feeding into a feeding hopper of a cable insulation extruding machine, directly melting and extruding through the cable insulation extruding machine, and coating 70mm2The surface of the conductor wire core is subjected to paying-off speed of 80m/min and then is subjected to irradiation crosslinking by a UV-LED ultraviolet irradiation device.
The same as in example 1.
Comparative example 1
A material manufacturer adopts the ultraviolet light cross-linked polyethylene insulating material produced by the prior art, and the ultraviolet light cross-linked polyethylene insulating material is melted and extruded by a cable insulation extruding machine to be coated with 70mm2The surface of the conductor wire core is subjected to paying-off speed of 80m/min and then is subjected to irradiation crosslinking by a UV-LED ultraviolet irradiation device.
The one-step uv crosslinked polyethylene cable insulation obtained in examples 1 to 4 and the uv crosslinked polyethylene insulation obtained in comparative example 1 were tested according to the performance test standards corresponding to the country of reference, and the performance test results are shown in table 1.
TABLE 1
As can be seen from the above table 1, the one-step ultraviolet crosslinked polyethylene cable insulation provided by the invention has various properties which can meet the standard requirements compared with the insulation material produced by the prior art, can well meet the use requirements of cable manufacturers, solves the problem of unqualified rate of change of the thermal aging strength of the finished product, and has excellent comprehensive properties.
The parts of the invention not specifically described can be realized by adopting the prior art, and the details are not described herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The one-step ultraviolet crosslinking polyethylene cable insulation is characterized by comprising the following components in parts by weight:
2. the one-step uv crosslinked polyethylene cable insulation according to claim 1, wherein said rheological masterbatch is an organofluorine processing aid material.
3. The one-step uv crosslinked polyethylene cable insulation according to claim 1, wherein the photoinitiator is selected from one or more of benzoin bis methyl ether, acylphosphorous oxide photoinitiators, benzophenone photoinitiators, dibenzoyl, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide.
4. The one-step uv crosslinked polyethylene cable insulation of claim 1, wherein the co-crosslinking agent is at least one selected from trimethylolpropane trimethacrylate, triallyl isocyanurate, triallyl cyanurate, trimethylolpropane triacrylate.
5. The one-step uv crosslinked polyethylene cable insulation according to claim 1, wherein the antioxidant is selected from at least one of antioxidant model 1010, 300, DLTP.
6. The one-step ultraviolet crosslinked polyethylene cable insulation according to claim 1, wherein the polyethylene resin is one or more of low density polyethylene, high density polyethylene, linear low density polyethylene and medium density polyethylene, and the combined polyethylene resin has a comprehensive melt index of 1.5-4 g/10 min.
7. The one-step method ultraviolet crosslinked polyethylene cable insulation as claimed in claim 1, wherein the syndiotactic polypropylene has a syndiotactic degree of 0.8-0.9 and a melting point of 125-140 ℃.
8. The preparation method of the one-step method ultraviolet crosslinked polyethylene cable insulation according to any one of claims 1 to 7, characterized by comprising the following steps:
according to parts by weight, 100 parts of polyethylene resin, 5-15 parts of syndiotactic polypropylene, 0.2-2 parts of rheological master batch, 1-3 parts of photoinitiator, 1-3 parts of auxiliary crosslinking agent and 0.1-0.5 part of antioxidant are put into a high mixing pot to be uniformly mixed, then the mixture is put into a feeding hopper of a cable insulation plastic extruding machine to be directly extruded by the cable insulation plastic extruding machine, then the cable insulation is formed by melting and coating on the surface of a cable conductor, and the molten cable insulation is subjected to ultraviolet irradiation to obtain crosslinking.
9. The method of claim 8, wherein the temperature of each zone of the cable insulation extruder is controlled to be 120-230 ℃.
10. The method of claim 9, wherein the temperatures of the zones of the cable insulation extruder are as follows: 150 ℃ in the fuselage 1 region, 160 ℃ in the fuselage 2 region, 170 ℃ in the fuselage 3 region, 180 ℃ in the fuselage 4 region and 190 ℃ in the fuselage 5 region; a flange is 200 ℃; zone 1 of the handpiece 210 deg.C, zone 2 of the handpiece 220 deg.C, and zone 3 of the handpiece 230 deg.C.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116178873A (en) * | 2023-03-06 | 2023-05-30 | 国网四川省电力公司电力科学研究院 | Silane crosslinked flame-retardant insulating material for overhead insulated conductor, production process and application |
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