Polypropylene insulated cable material, preparation method thereof and polypropylene insulated cable

Abstract

The invention provides a polypropylene insulated cable material, a preparation method thereof and a polypropylene insulated cable. The preparation raw materials of the polypropylene insulated cable material provided by the invention comprise the following components in percentage by mass: 30-80% of polypropylene resin; 10%-40% of polyethylene resin; 5%-60% of an elastomer; 0%-1%, not 0%, of an additive; 0%-5% of a processing aid, but not 0%. The special polypropylene resin, the polyethylene resin, the elastomer, the additive and the processing aid are matched according to a certain proportion, and the components act together, so that the toughness of the polypropylene is improved, and meanwhile, the excellent electrical insulation property and ageing resistance of the polypropylene can be ensured.

Description

Technical Field

[0001] The invention relates to the field of chemical industry, and in particular to a polypropylene insulated cable material and a preparation method thereof, and a polypropylene insulated cable. Background Art

[0002] At present, cross-linked polyethylene is the most commonly used cable insulation material. This material can not only maintain the good insulation performance of polyethylene, but also has excellent mechanical properties at high temperatures. However, the chemical cross-linking process causes polyethylene to lose its thermoplastic properties, and it is difficult to recycle and reuse the cable after its life expires, which will inevitably cause a large amount of energy and resource waste and environmental problems. In addition, polyethylene needs to be treated with high temperature and high pressure during the cross-linking process, and the by-products such as methane, cumyl alcohol, acetophenone and water and other low-boiling point small molecules will also have a lasting impact on the insulation performance of the cable.

[0003] Thermoplastic polypropylene high-voltage cables have the characteristics of low production energy consumption, high operating temperature, and recyclability. They are more adaptable to the development requirements of future power grids and have become a new generation of environmentally friendly cables that can replace cross-linked polyethylene.

[0004] In the related art, CN113999457A discloses an environmentally friendly polypropylene-based insulating material, which uses polypropylene, SEBS, and an antioxidant to prepare a polypropylene-based insulating material with excellent heat resistance stability, but its low temperature resistance is poor. CN103589105A discloses a method for preparing a modified polypropylene insulating material using components such as polypropylene resin, polyolefin elastomer rubber, and an antioxidant. The insulating material has good high and low temperature resistance, but the insulating material is too rigid and has poor toughness, and the problem of thermal oxidation degradation is prone to occur during the processing process.

[0005] In view of the problem that polypropylene materials cannot meet the use requirements due to their poor toughness when used as insulating cable materials, polypropylene is generally modified and improved by means of blending modification, copolymerization modification, grafting modification, nano-modification and crystal form regulation. However, although the toughness can be improved to a certain extent by the above-mentioned modification methods, its electrical properties or aging resistance are affected, so that the cable insulation material cannot have high electrical properties, excellent toughness and excellent aging resistance at the same time. The research of existing technologies mainly focuses on toughening, and lacks consideration of this problem. Summary of the invention

[0006] In view of this, the present invention provides a polypropylene insulated cable material and a preparation method thereof, as well as a polypropylene insulated cable. The polypropylene insulated cable material provided by the present invention improves toughness while taking into account its electrical properties and aging resistance, so that the material has excellent toughness, electrical properties and aging resistance at the same time.

[0007] The present invention provides a polypropylene insulated cable material, the raw materials for preparing the polypropylene insulated cable material include the following components in percentage by mass:

[0008]

[0009] Preferably, the type and specifications of the polypropylene resin are as follows: melt index range is 0.1-60g / 10min, flexural modulus ≤1400MPa, elongation at break ≥300%, simple supported beam notched impact strength ≥5.0KJ / m 2 ;

[0010] The types and specifications of the polyethylene resin are as follows: melt index range is 0.1-60g / 10min, density is 0.90-0.96g / cm 3 .

[0011] Preferably, the polypropylene resin is at least one of Zhejiang Petrochemical EP300H, Zhejiang Petrochemical S1003, Yanshan Petrochemical PPR-B8101 and Yanshan Petrochemical T30S.

[0012] Preferably, the polyethylene resin is at least one of Zhejiang Petrochemical DFDA7042, Zhejiang Petrochemical 2624H and Zhejiang Petrochemical HD5502S.

[0013] Preferably, the elastomer is at least one of POE, SEBS and EPDM.

[0014] Preferably, the elastomer is at least one of SEBS 503T from Baling Petrochemical, Dow POE 8180 and Dow EPDM 4725P.

[0015] Preferably, the additive is at least one of a hindered phenol antioxidant, a phosphite antioxidant and a benzofuranone antioxidant;

[0016] The processing aid is a fluorine-containing polymer processing aid.

[0017] Preferably, the processing aid is PPA processing aid FX-5911.

[0018] The present invention also provides a method for preparing the polypropylene insulated cable material described in the above technical scheme, comprising: premixing polypropylene resin, polyethylene resin, elastomer, additives and processing aids, and then feeding them into a twin-screw extruder for shearing and extrusion, and then drawing, cooling and pelletizing to obtain the polypropylene insulated cable material.

[0019] The present invention also provides a polypropylene insulated cable, which is made from the polypropylene insulated cable material described in the above technical solution.

[0020] In the prior art, ordinary polypropylene materials have poor toughness, and modified polypropylene cannot take into account toughness, electrical properties and aging resistance. In view of the above problems, the present invention provides a polypropylene insulated cable material, which is prepared by mixing specific polypropylene resin, polyethylene resin, elastomer, additives and processing aids in a certain proportion. The above components work together to improve the toughness of polypropylene while ensuring its excellent electrical insulation performance and aging resistance.

[0021] Experimental results show that the flexural modulus of the polypropylene insulated cable material of the present invention is below 376 MPa, the oxidation induction period at 200° C. is above 45 min, and it has excellent toughness and anti-aging properties; in addition, various electrical properties meet the technical index requirements. DETAILED DESCRIPTION

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0023] In this article, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0024] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] Herein, when it comes to numerical ranges, unless otherwise specified, the numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0026] In this article, when referring to the unit of a data range, if there is a unit only after the right endpoint, it means that the units of the left and right endpoints are the same. For example, 150-400℃ means that the units of the left endpoint "100" and the right endpoint "400" are both ℃.

[0027] Only some numerical ranges are specifically disclosed herein. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, and likewise any upper limit can be combined with any other upper limit to form an unspecified range. In addition, each separately disclosed point or single value can itself be combined as a lower limit or upper limit with any other point or single value or with other lower limits or upper limits to form an unspecified range.

[0028] The present invention provides a polypropylene insulated cable material, the raw materials for preparing the polypropylene insulated cable material include the following components in percentage by mass:

[0029]

[0030] In the present invention, preferably, the type and specifications of the polypropylene resin are as follows: melt index range is 0.1-60g / 10min, flexural modulus ≤1400MPa, elongation at break ≥300%, simple supported beam notched impact strength ≥5.0KJ / m 2 . In the present invention, more preferably, the polypropylene resin is at least one of Zhejiang Petrochemical EP300H, Zhejiang Petrochemical S1003, Yanshan Petrochemical PPR-B8101 and Yanshan Petrochemical T30S. In the present invention, the amount of the polypropylene resin is 30% to 80%, specifically 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%.

[0031] In the present invention, preferably, the type and specifications of the polyethylene resin are as follows: the melt index range is 0.1-60 g / 10 min, the density is 0.90-0.96 g / cm 3 In the present invention, more preferably, the polyethylene resin is at least one of Zhejiang Petrochemical DFDA7042, Zhejiang Petrochemical 2624H and Zhejiang Petrochemical HD5502S. In the present invention, the amount of the polyethylene resin is 10% to 40%, specifically 10%, 15%, 20%, 25%, 30%, 35%, 40%.

[0032] In the present invention, the elastomer is preferably at least one of POE, SEBS and EPDM, more preferably at least one of Baling Petrochemical SEBS 503T, Dow POE 8180 and Dow EPDM 4725P. In the present invention, the amount of the elastomer is 5% to 60%, specifically 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%.

[0033] In the present invention, the additive is preferably at least one of a hindered phenol antioxidant, a phosphite antioxidant and a benzofuranone antioxidant, and more preferably at least one of antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant 626 and antioxidant 501. In the present invention, the amount of the additive is 0% to 1%, and is not 0%, specifically 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%.

[0034] In the present invention, the processing aid is preferably a fluorine-containing polymer processing aid, more preferably a PPA processing aid FX-5911, which is from 3M, USA. In the present invention, the amount of the processing aid is 0% to 5%, and is not 0%, specifically 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%.

[0035] In the present invention, the dosage of the above components is preferably 100%.

[0036] The present invention also provides a method for preparing a polypropylene insulated cable material, which is characterized by comprising: premixing polypropylene resin, polyethylene resin, elastomer, additives and processing aids, and then feeding them into a twin-screw extruder for shearing and extrusion, and then drawing, cooling and pelletizing to obtain a polypropylene insulated cable material. The types and amounts of the polypropylene resin, polyethylene resin, elastomer, additives and processing aids are the same as those described in the above technical solution, and will not be repeated here.

[0037] In the present invention, the premixing can be carried out in a mixer, specifically in a high-speed mixer. The above various materials are mixed by premixing. The mixed material is fed into a twin-screw extruder by a feeder, and the material is sheared and mixed by the twin-screw extruder and then extruded from the die head, and then drawn, air-cooled, and pelletized to obtain a polypropylene insulated cable material. Among them, after pelletizing, it is preferably dried and mixed evenly. In the present invention, the temperature of each section of the twin-screw extruder is preferably controlled at 150-400°C. The feeding frequency is preferably 5-45Hz, specifically 5Hz, 10Hz, 15Hz, 20Hz, 25Hz, 30Hz, 35Hz, 40Hz, 45Hz. The twin-screw main engine speed is preferably 60-150rpm, specifically 60rpm, 70rpm, 80rpm, 90rpm, 100rpm, 110rpm, 120rpm, 130rpm, 140rpm, 150rpm. Through the above preparation process, a masterbatch, namely a polypropylene insulating cable material, is obtained.

[0038] The present invention also provides a polypropylene insulated cable, which is made from the polypropylene insulated cable material described in the above technical solution.

[0039] In the prior art, ordinary polypropylene materials have poor toughness, and modified polypropylene cannot take into account toughness, electrical properties and aging resistance. In view of the above problems, the present invention provides a polypropylene insulated cable material, which is prepared by mixing specific polypropylene resin, polyethylene resin, elastomer, additives and processing aids in a certain proportion. The above components work together to improve the toughness of polypropylene while ensuring its excellent electrical insulation performance and aging resistance.

[0040] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0041] Examples 1-6 and Comparative Examples 1-6

[0042] 1. Raw materials

[0043] The raw material formulas of Comparative Examples 1-6 (corresponding to samples 1# to 6#) and Examples 1-6 (corresponding to samples 7# to 12#) are respectively shown in Table 1-2.

[0044] Table 1: Raw material formula of comparative examples 1-6

[0045]

[0046] Table 2: Raw material formula of Examples 1-6

[0047]

[0048] 2. Preparation

[0049] Premix polypropylene resin, polyethylene resin, elastomer, additives and processing aids in a high-speed mixer in proportion. The mixed materials are fed into a twin-screw extruder by a feeder. The raw materials are sheared and kneaded by the twin-screw extruder and then extruded from the die. After drawing, cooling, pelletizing, drying and uniform mixing, modified polypropylene insulation cable materials are prepared.

[0050] 3. Testing

[0051] The performance of each sample was tested, and the results are shown in Table 3.

[0052] Table 3: Performance test results of each sample

[0053]

[0054] Note: The oxidation induction period is measured by isothermal oxidation induction period OIT according to GB / T 19466.6-2009, and the measuring temperature is 200℃. The volume resistivity test shall be carried out according to the provisions of GB / T 31838.2-2009, the test piece thickness is 1.0±0.1mm, the test temperature is 20±2℃, and the test voltage is DC 1kV. The dielectric strength shall be carried out according to the provisions of GB / T 1408.1-2016. The relative dielectric constant and dielectric loss factor shall be carried out according to the provisions of GB / T 31838.6-2021.

[0055] From the test results in the table above, it can be seen that compared with samples 1#~6#, the bending modulus of samples 7#~12# is significantly reduced, that is, the toughness is significantly improved; at the same time, the oxidation induction period of samples 7#~12# is extended as a whole, that is, the overall oxidation resistance is improved; in addition, the electrical properties of samples 7#~12# all meet the index requirements. Specifically, samples 1#-2# do not add polyethylene resin and elastomer, samples 3#-4# do not add polyethylene resin, and samples 5#-6# do not add elastomer. As a result, the comprehensive performance of toughness and aging resistance of these samples deteriorates.

[0056] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best mode, and also enable any technician in the field to practice the present invention, including making and using any device or system, and implementing any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements similar to the literal expression of the claims, or if they include equivalent structural elements that are not substantially different from the literal expression of the claims, then these other embodiments should also be included in the scope of the claims.

Claims

1. A polypropylene insulated cable material, characterized in that: The raw materials for its preparation include the following components in percentage by mass:

2. The polypropylene insulated cable material according to claim 1, characterized in that: The types and specifications of the polypropylene resin are as follows: melt index range is 0.1-60g / 10min, flexural modulus ≤1400MPa, elongation at break ≥300%, simple supported beam notched impact strength ≥5.0KJ / m 2 ; The types and specifications of the polyethylene resin are as follows: melt index range is 0.1-60g / 10min, density is 0.90-0.96g / cm 3 .

3. The polypropylene insulated cable material according to claim 1 or 2, characterized in that: The polypropylene resin is at least one of Zhejiang Petrochemical EP300H, Zhejiang Petrochemical S1003, Yanshan Petrochemical PPR-B8101 and Yanshan Petrochemical T30S.

4. The polypropylene insulated cable material according to claim 1 or 2, characterized in that: The polyethylene resin is at least one of Zhejiang Petrochemical DFDA7042, Zhejiang Petrochemical 2624H and Zhejiang Petrochemical HD5502S.

5. The polypropylene insulated cable material according to claim 1, characterized in that: The elastomer is at least one of POE, SEBS and EPDM.

6. The polypropylene insulated cable material according to claim 1 or 6, characterized in that: The elastomer is at least one of SEBS 503T of Baling Petrochemical, Dow POE 8180 and Dow EPDM 4725P.

7. The polypropylene insulated cable material according to claim 1, characterized in that: The additive is at least one of a hindered phenol antioxidant, a phosphite antioxidant and a benzofuranone antioxidant; The processing aid is a fluorine-containing polymer processing aid.

8. The polypropylene insulated cable material according to claim 1 or 7, characterized in that: The processing aid is PPA processing aid FX-5911.

9. A method for preparing a polypropylene insulated cable material according to any one of claims 1 to 8, characterized in that: include: The polypropylene resin, polyethylene resin, elastomer, additives and processing aids are pre-mixed and then sent into a twin-screw extruder for shearing and extrusion, followed by drawing, cooling and pelletizing to obtain a polypropylene insulating cable material.

10. A polypropylene insulated cable, characterized in that: The invention is made from the polypropylene insulated cable material according to any one of claims 1 to 8.

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