Sheath Material and Its Preparation Method and Application

Abstract

This application belongs to the field of rubber technology and provides a sheath material, its preparation method and application. The raw materials for preparing the sheath material include chlorinated polyethylene, ethylene-vinyl acetate copolymer, antioxidant, flame retardant, plasticizer and additives. The mass content of vinyl acetate units in the ethylene-vinyl acetate copolymer is 60% - 70%, and the mass content of chlorine in the chlorinated polyethylene is 28% - 32%. By controlling the chlorine content in the chlorinated polyethylene and the content of vinyl acetate units in the ethylene-vinyl acetate copolymer, this application improves the compatibility between the chlorinated polyethylene and the ethylene-vinyl acetate copolymer, and the two cooperate synergistically to effectively ensure the high-temperature resistance and mechanical properties of the sheath material. In addition, by adding antioxidants, flame retardants, plasticizers and additives for synergistic cooperation, the high-temperature resistance and aging resistance of the sheath material are significantly improved. The high-temperature resistance temperature of the sheath material in this application can reach above 125 °C.

Description

Technical Field

[0001] The present application relates to the technical field of rubber, and particularly to a sheath material, a preparation method thereof, and an application thereof. Background Art

[0002] To increase the operating current-carrying capacity, the long-term allowable working temperature of the conductor and the sheath material of the fan cable has risen. The fan cable has higher and higher requirements for the temperature resistance level. However, in the traditional technology, the long-term allowable working temperature of the fan cable is only 90 °C, which can no longer meet the temperature resistance requirements of the fan cable. Therefore, how to provide a sheath material with both mechanical properties and high temperature resistance has become an urgent technical problem to be solved at present. Summary of the Invention

[0003] Based on this, an embodiment of the present application provides a sheath material with good mechanical properties and high temperature resistance, a preparation method thereof, and an application thereof.

[0004] In a first aspect, the present application provides a sheath material. The preparation raw materials of the sheath material include chlorinated polyethylene, ethylene-vinyl acetate copolymer, antioxidant, flame retardant, plasticizer, and auxiliary agent. The mass content of vinyl acetate units in the ethylene-vinyl acetate copolymer is 60% - 70%, and the mass content of chlorine in the chlorinated polyethylene is 28% - 32%.

[0005] In some embodiments, the mass ratio of the chlorinated polyethylene to the ethylene-vinyl acetate copolymer is (2 - 3.5):1.

[0006] In some embodiments, the total mass of the chlorinated polyethylene and the ethylene-vinyl acetate copolymer accounts for 40% - 43% of the total mass of the preparation raw materials of the sheath material.

[0007] In some embodiments, the antioxidant includes at least one of nickel dibutyldithiocarbamate, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and 2-mercaptobenzimidazole.

[0008] In some embodiments, the flame retardant includes at least one of hydrotalcite, antimony trioxide, and aluminum hydroxide.

[0009] In some embodiments, the plasticizer includes at least one of trioctyl trimellitate, dioctyl sebacate, and dioctyl phthalate.

[0010] In some embodiments, the auxiliary agent includes at least one of reinforcing agent, lubricant, coupling agent, filler, crosslinking agent, co-crosslinking agent, and color powder.

[0011] In some embodiments, calculated by mass fraction, the preparation raw materials of the sheath material include:

[0012] 60 to 70 parts of chlorinated polyethylene;

[0013] 20 to 30 parts of ethylene-vinyl acetate copolymer;

[0014] 1 to 2 parts of antioxidant;

[0015] 15 to 25 parts of flame retardant;

[0016] 5 to 10 parts of plasticizer;

[0017] 14 to 18 parts of reinforcing agent;

[0018] 18 to 30 parts of lubricant;

[0019] 0.5 to 1 part of coupling agent;

[0020] 40 to 60 parts of filler;

[0021] 2 to 5 parts of crosslinking agent;

[0022] 2 to 5 parts of co-crosslinking agent; and,

[0023] 1 to 3 parts of color powder.

[0024] In some embodiments, the filler includes at least one of kaolin, talcum powder, and calcium carbonate.

[0025] In some embodiments, the reinforcing agent includes at least one of silica and carbon black.

[0026] In some embodiments, the crosslinking agent includes at least one of dicumyl peroxide and 2,4-di-tert-butylperoxyisopropylbenzene.

[0027] In some embodiments, the co-crosslinking agent includes at least one of triallyl isocyanurate and triallyl cyanurate.

[0028] In some embodiments, the lubricant includes at least one of polyethylene wax, semi-refined paraffin wax, and microcrystalline wax; optionally, the number average molecular weight of the polyethylene wax is 3000 to 5000.

[0029] In a second aspect, the present application provides a method for preparing the sheath material as described in the first aspect, the preparation method including:

[0030] Mixing the chlorinated polyethylene, the ethylene-vinyl acetate copolymer, the antioxidant, the flame retardant, the plasticizer, and the auxiliary agent to prepare the sheath material.

[0031] In some embodiments, the temperature of the mixing is 130°C to 135°C.

[0032] In a third aspect, the present application provides an application of the sheath material as described in the first aspect in the preparation of power transmission articles.

[0033] In a fourth aspect, the present application provides a cable, and the cable includes the sheath material as described in the first aspect.

[0034] Compared with the traditional technology, the present application has at least the following beneficial effects:

[0035] By controlling the chlorine content in the chlorinated polyethylene and the vinyl acetate unit content in the ethylene-vinyl acetate copolymer, the present application improves the compatibility between the chlorinated polyethylene and the ethylene-vinyl acetate copolymer. The two cooperate synergistically to effectively ensure the high-temperature resistance performance and mechanical properties of the sheath material. In addition, by adding antioxidants, flame retardants, plasticizers and additives for synergistic cooperation, the high-temperature resistance performance and aging resistance ability of the sheath material can be significantly improved. The high-temperature resistance temperature of the sheath material of the present application can reach above 125 °C, meeting the use requirements of the cable when the conductor temperature reaches 125 °C during use. Detailed Embodiments

[0036] The following will further describe the present application in detail in combination with the embodiments and examples. These embodiments and examples are only used to illustrate the present application and are not intended to limit the scope of the present application. The purpose of providing these embodiments and examples is to make the understanding of the disclosed content of the present application more thorough and comprehensive. It should also be understood that the present application can be implemented in many different forms and is not limited to the embodiments and examples described herein. Those skilled in the art can make various changes or modifications without departing from the connotation of the present application, and the equivalent forms obtained also fall within the protection scope of the present application. In addition, in the following description, a large number of specific details are given to provide a more thorough understanding of the present application. It should be understood that the present application can be implemented without one or more of these details.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of the present application in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0038] In the present application, "optionally", "optional", "option" mean having or not having, that is, any one selected from two parallel options of "having" or "not having". If "optional" appears in a technical solution for multiple times, without special explanation and without contradiction or mutual restriction relationship, each "optional" is independent of each other.

[0039] In this application, in "the first aspect", "the second aspect", etc., the terms "first", "second", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", etc. only serve the purpose of non-exhaustive enumerative description and should be understood not to constitute a closed limitation on quantity.

[0040] In this application, among the technical features described in an open-ended manner, there are included closed technical solutions composed of the listed features, as well as open technical solutions containing the listed features.

[0041] In this application, regarding numerical intervals (i.e., numerical ranges), unless otherwise specified, the distribution of the selectable numerical values within the numerical interval is considered continuous and includes the two numerical endpoints of the numerical interval (i.e., the minimum value and the maximum value), as well as each numerical value between these two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers within the numerical interval, it includes the two endpoint integers of the numerical range, as well as each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all sub-ranges subsumed therein. The "numerical values" in the numerical interval can be any quantitative values, such as numbers, percentages, ratios, etc. "Numerical intervals" are allowed to broadly include quantitative intervals such as percentage intervals, ratio intervals, and ratio value intervals.

[0042] All the documents mentioned in this application are cited in this application as references, just as if each document is cited separately as a reference. Unless it conflicts with the invention purpose and / or technical solution of this application, otherwise, the cited documents involved in this application are cited for their entire content and entire purpose. When this application involves cited documents, the definitions of relevant technical features, terms, nouns, phrases, etc. in the cited documents are also cited together. When this application involves cited documents, the examples and preferred ways of the relevant technical features cited can also be incorporated into this application as references, but only to the extent that the application of this application can be implemented. It should be understood that when the cited content conflicts with the description in this application, this application shall prevail or be amended adaptively according to the description in this application.

[0043] In the traditional technology, chlorinated polyethylene has poor high-temperature resistance and poor mechanical properties at high temperatures, and cannot meet the high-temperature working requirements of fan cables. Therefore, flame retardants and anti-aging agents are added to the chlorinated polyethylene substrate to improve the high-temperature resistance. However, the addition of flame retardants and anti-aging agents results in poor mechanical properties of chlorinated polyethylene. Moreover, as the working temperature requirements for cables become higher and higher, the addition of flame retardants and anti-aging agents cannot further improve the high-temperature resistance grade of the sheath material. The research of this application finds that by adjusting the chlorine content of chlorinated polyethylene and coordinating with the content of vinyl acetate units in ethylene-vinyl acetate copolymer, further, through the synergistic cooperation of anti-aging agents, flame retardants, plasticizers and additives, the high-temperature resistance and mechanical properties of the sheath material are effectively improved.

[0044] In the first aspect of this application, a sheath material is provided. The preparation raw materials of the sheath material include chlorinated polyethylene, ethylene-vinyl acetate copolymer, anti-aging agent, flame retardant, plasticizer and additive. The mass content of vinyl acetate units in the ethylene-vinyl acetate copolymer is 60% - 70%, and the mass content of chlorine in the chlorinated polyethylene is 28% - 32%.

[0045] This application controls the chlorine content in chlorinated polyethylene and the content of vinyl acetate units in ethylene-vinyl acetate copolymer to improve the compatibility of chlorinated polyethylene and ethylene-vinyl acetate copolymer. The two cooperate synergistically to effectively ensure the high-temperature resistance and mechanical properties of the sheath material. In addition, by adding anti-aging agents, flame retardants, plasticizers and additives for synergistic cooperation, the high-temperature resistance and aging resistance of the sheath material are significantly improved. The high-temperature resistance temperature of the sheath material of this application can reach above 125°C.

[0046] Among them, the mass content of vinyl acetate units in the ethylene-vinyl acetate copolymer can be 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69% or 70%. The mass content of chlorine in the chlorinated polyethylene can be 28.0%, 28.5%, 29.0%, 29.5%, 30.0%, 30.5%, 31.0%, 31.5% or 32.0%.

[0047] In this application, controlling the chlorine content in chlorinated polyethylene can significantly improve the temperature resistance grade, weaken the polarity and have a high thermal decomposition temperature; and by controlling the content of vinyl acetate units in ethylene-vinyl acetate copolymer, the compatibility with chlorinated polyethylene is improved, and the two complement each other synergistically to improve the thermal decomposition temperature and thermal stability of the sheath material.

[0048] In some embodiments, the Mooney viscosity ML125℃(1+4) of the chlorinated polyethylene is 45 to 50. Among them, in ML125℃(1+4), M represents Mooney, L represents using a large rotor, the test temperature is 125℃, the preheating time is 1 minute, and the rotation time is 4 minutes.

[0049] In some embodiments, the mass ratio of the chlorinated polyethylene to the ethylene-vinyl acetate copolymer is (2 to 3.5):1. For example, it can be 2.0:1, 2.1:1, 2.2:1, 2.3:1, 2.4:1, 2.5:1, 2.6:1, 2.7:1, 2.8:1, 2.9:1, 3.0:1, 3.1:1, 3.2:1, 3.3:1, 3.4:1 or 3.5:1.

[0050] By selecting the mass ratio of the chlorinated polyethylene to the ethylene-vinyl acetate copolymer as above in this application, the mechanical properties and high-temperature resistance of the material can be improved through synergistic cooperation. At the same time, it is convenient for processing operations and can avoid problems such as easy scorching during mixing.

[0051] In some embodiments, the total mass of the chlorinated polyethylene and the ethylene-vinyl acetate copolymer accounts for 40% to 43% of the total mass of the raw materials for preparing the sheath material. For example, it can be 40.0%, 40.3%, 40.6%, 40.9%, 41.2%, 41.5%, 41.8%, 42.1%, 42.4%, 42.7% or 43.0%.

[0052] By selecting the proportion of the total mass of the chlorinated polyethylene and the ethylene-vinyl acetate copolymer in the raw materials as above in this application, not only is the density of the material small, but also the mechanical properties and high-temperature resistance of the material can be improved through synergistic cooperation. In addition, the raw material cost can be reduced.

[0053] In some embodiments, the anti-aging agent includes at least one of nickel dibutyldithiocarbamate (NBC), 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and 2-mercaptobenzimidazole. Nickel dibutyldithiocarbamate is preferred.

[0054] This application uses nickel dibutyldithiocarbamate as the anti-aging agent, which has ozone resistance and heat-oxidative aging resistance, and can cooperate with the chlorinated polyethylene and the ethylene-vinyl acetate copolymer to improve the comprehensive performance of the material.

[0055] In some embodiments, the flame retardant includes at least one of hydrotalcite, antimony trioxide, and aluminum hydroxide. Hydrotalcite and antimony trioxide are preferred. Optionally, the mass ratio of the hydrotalcite to the antimony trioxide is (1 to 3):1, and it can be 2:1.

[0056] This application uses hydrotalcite and antimony trioxide as flame retardants, which cooperate synergistically to improve the flame retardant performance of chlorinated polyethylene, and can also improve the comprehensive performance of the sheath material, with the advantages of non-toxicity, low smoke, and good flame retardant effect.

[0057] In some embodiments, the plasticizer includes at least one of trioctyl trimellitate (TOTM), dioctyl sebacate, and dioctyl phthalate. Preferably, it is trioctyl trimellitate.

[0058] In this application, trioctyl trimellitate is used as the plasticizer. It has a high molecular weight, low volatility, and good heat resistance, and can cooperate synergistically with chlorinated polyethylene and ethylene-vinyl acetate copolymer to improve the thermal stability of the sheath material.

[0059] In some embodiments, the auxiliary agent includes at least one of a reinforcing agent, a lubricant, a coupling agent, a filler, a crosslinking agent, a co-crosslinking agent, and a color powder.

[0060] In some embodiments, calculated by mass fraction, the raw materials for preparing the sheath material include:

[0061] 60 parts to 70 parts of chlorinated polyethylene;

[0062] 20 parts to 30 parts of ethylene-vinyl acetate copolymer;

[0063] 1 part to 2 parts of antioxidant;

[0064] 15 parts to 25 parts of flame retardant;

[0065] 5 parts to 10 parts of plasticizer;

[0066] 14 to 18 parts of reinforcing agent;

[0067] 18 to 30 parts of lubricant;

[0068] 0.5 to 1 part of coupling agent;

[0069] 40 to 60 parts of filler;

[0070] 2 to 5 parts of crosslinking agent;

[0071] 2 to 5 parts of co-crosslinking agent; and,

[0072] 1 to 3 parts of color powder.

[0073] For example, the parts by mass of chlorinated polyethylene can be 60 parts, 61 parts, 62 parts, 63 parts, 64 parts, 65 parts, 66 parts, 67 parts, 68 parts, 69 parts or 70 parts. The parts by mass of ethylene-vinyl acetate copolymer can be 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts or 30 parts. The parts by mass of antioxidant can be 1.0 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts or 2.0 parts. The parts by mass of flame retardant can be 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts or 25 parts. The parts by mass of plasticizer can be 5.0 parts, 5.5 parts, 6.0 parts, 6.5 parts, 7.0 parts, 7.5 parts, 8.0 parts, 8.5 parts, 9.0 parts, 9.5 parts or 10.0 parts. The parts by mass of reinforcing agent can be 14.0 parts, 14.5 parts, 15.0 parts, 15.5 parts, 16.0 parts, 16.5 parts, 17.0 parts, 17.5 parts or 18.0 parts. The parts by mass of lubricant can be 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts or 30 parts. The parts by mass of coupling agent can be 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1.0 part. The parts by mass of filler can be 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts or 60 parts. The parts by mass of crosslinking agent can be 2.0 parts, 2.5 parts, 3.0 parts, 3.5 parts, 4.0 parts, 4.5 parts or 5.0 parts. The parts by mass of co-crosslinking agent can be 2.0 parts, 2.5 parts, 3.0 parts, 3.5 parts, 4.0 parts, 4.5 parts or 5.0 parts. The parts by mass of color powder can be 1.0 part, 1.5 parts, 2.0 parts, 2.5 parts or 3.0 parts.

[0074] Through the synergistic cooperation of each preparation raw material, the present application effectively improves the high-temperature resistance performance of the sheath material and can maintain the mechanical property stability in a high-temperature environment.

[0075] In some embodiments, the filler includes at least one of kaolin, talcum powder and calcium carbonate.

[0076] In some embodiments, the reinforcing agent includes at least one of silica and carbon black.

[0077] In some embodiments, the crosslinking agent includes at least one of dicumyl peroxide and 2,4-di-tert-butylperoxyisopropylbenzene.

[0078] In some embodiments, the co-crosslinking agent includes at least one of triallyl isocyanurate and triallyl cyanurate.

[0079] In some embodiments, the lubricant includes at least one of polyethylene wax, semi-refined paraffin wax, and microcrystalline wax; optionally, the number-average molecular weight of the polyethylene wax is 3000 to 5000. By selecting polyethylene wax as the lubricant as above in this application, it can cooperate synergistically with chlorinated polyethylene and ethylene-vinyl acetate copolymer to improve the aging resistance and high-temperature resistance of the material.

[0080] In some embodiments, the coupling agent includes at least one of silane coupling agent A-172, KH-845, and coupling agent 316.

[0081] The second aspect of this application provides a preparation method of the sheath material as described in the first aspect, and the preparation method includes:

[0082] Mix the chlorinated polyethylene, the ethylene-vinyl acetate copolymer, the anti-aging agent, the flame retardant, the plasticizer, and the auxiliary agent to prepare the sheath material.

[0083] In some embodiments, the temperature of the mixing is 130°C to 135°C, for example, it can be 130°C, 131°C, 132°C, 133°C, 134°C, or 135°C.

[0084] This application controls the mixing temperature to ensure that the raw materials are evenly mixed, and harmful substances such as small-molecule substances and moisture in the raw materials volatilize sufficiently, so as to avoid affecting the tensile strength and tear strength of the finished rubber compound.

[0085] In some embodiments, the preparation method of the sheath material includes:

[0086] S1. Weigh the preparation raw materials according to the formula mass fraction;

[0087] S2. First, add the chlorinated polyethylene and the ethylene-vinyl acetate copolymer to an internal mixer and mix for 2 min to 4 min, and raise the temperature to 70°C to 90°C for sufficient mixing;

[0088] S3. Then add the anti-aging agent and the lubricant, mix for 0.5 min to 1.5 min, and finally add the flame retardant, the coupling agent, the reinforcing agent, the filler, and the plasticizer, mix for 3 min to 5 min. When the mixing temperature reaches 130°C to 135°C, discharge the material from the internal mixer, pass the mixed rubber compound through a two-roll mill 1 to 2 times, and calender it with a three-roll calender without slitting and taking out the sheet;

[0089] S5. Put the cooled rubber compound into an internal mixer, add the vulcanizing agent, the vulcanization accelerator, and the color powder, mix for 1 min to 1.5 min and then discharge the material. After discharging, pass it through a two-roll mill 1 to 2 times, calender it with a three-roll calender and slit and take out the sheet. After the output rubber sheet is cooled, the sheath material is obtained.

[0090] The third aspect of the present application provides an application of the sheath material as described in the first aspect in the preparation of power transmission articles.

[0091] The fourth aspect of the present application provides a cable, and the cable includes the sheath material as described in the first aspect.

[0092] In some embodiments, the cable includes a plurality of cores and a sheath layer, the sheath layer covers the plurality of cores, and the material of the sheath layer is the sheath material.

[0093] The implementation schemes of the present application will be described in detail below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. For the experimental methods without specific conditions in the following embodiments, first refer to the guidance given in the present application, and it can also be carried out according to the experimental manuals or conventional conditions in the art, or according to the conditions recommended by the manufacturer, or refer to the experimental methods known in the art.

[0094] The number average molecular weight of polyethylene wax is 3500.

[0095] Hydrotalcite is purchased from LKAB Minerals AB, Sweden, with the product number UltraCarb 1251.

[0096] Example 1

[0097] S1. Weigh the preparation raw materials according to the formula mass parts, including:

[0098] 65 parts of chlorinated polyethylene;

[0099] 25 parts of ethylene-vinyl acetate copolymer;

[0100] 2 parts of antioxidant NBC;

[0101] 15 parts of hydrotalcite;

[0102] 8 parts of antimony trioxide;

[0103] 8 parts of trioctyl trimellitate;

[0104] 14 parts of white carbon black;

[0105] 12 parts of polyethylene wax;

[0106] 8 parts of semi-refined paraffin wax;

[0107] 0.8 part of silane coupling agent A-172;

[0108] 60 parts of kaolin;

[0109] 3 parts of dicumyl peroxide;

[0110] 3 parts of triallyl isocyanurate; and,

[0111] 2 parts of toner;

[0112] Among them, the mass content of chlorine in chlorinated polyethylene is 30%, and ML125℃(1+4) is 45. The mass content of vinyl acetate in ethylene-vinyl acetate copolymer is 70%;

[0113] S2. First, add chlorinated polyethylene and ethylene-vinyl acetate copolymer into the internal mixer and mix for 3 min, and raise the temperature to 80℃ for full mixing;

[0114] S3. Then add antioxidant and lubricant, mix for 1 min, and finally add flame retardant, coupling agent, reinforcing agent, filler and plasticizer, mix for 4 min. When the mixing temperature reaches 132℃, discharge the material from the internal mixer. Pass the mixed rubber twice through the two-roll mill, and calender it with a three-roll calender without cutting into sheets;

[0115] S5. Put the cooled rubber into the internal mixer, add vulcanizing agent, vulcanization accelerator and toner, mix for 1.5 min and then discharge the material. After discharging, pass it twice through the two-roll mill, calender it with a three-roll calender and cut it into sheets. After the output rubber sheet is cooled, the described sheath material is obtained.

[0116] Example 2

[0117] Prepare the sheath material according to the method of Example 1, and the difference is only that the preparation raw materials include:

[0118] 60 parts of chlorinated polyethylene;

[0119] 20 parts of ethylene-vinyl acetate copolymer;

[0120] 1 part of antioxidant NBC;

[0121] 15 parts of hydrotalcite;

[0122] 10 parts of antimony trioxide;

[0123] 5 parts of trioctyl trimellitate;

[0124] 16 parts of white carbon black;

[0125] 12 parts of polyethylene wax;

[0126] 9 parts of semi-refined paraffin wax;

[0127] 0.5 part of silane coupling agent A-172;

[0128] 40 parts of kaolin;

[0129] 3 parts of dicumyl peroxide;

[0130] 2 parts of triallyl isocyanurate; and,

[0131] 1 part of toner;

[0132] Among them, the mass content of chlorine in chlorinated polyethylene is 28%, and the mass content of vinyl acetate in ethylene-vinyl acetate copolymer is 60%.

[0133] Example 3

[0134] Prepare the sheath material according to the method of Example 1, the difference is only that the preparation raw materials include:

[0135] 70 parts of chlorinated polyethylene;

[0136] 30 parts of ethylene-vinyl acetate copolymer;

[0137] 2 parts of antioxidant NBC;

[0138] 12 parts of hydrotalcite;

[0139] 10 parts of antimony trioxide;

[0140] 10 parts of trioctyl trimellitate;

[0141] 18 parts of white carbon black;

[0142] 15 parts of polyethylene wax;

[0143] 15 parts of semi-refined paraffin wax;

[0144] 1 part of silane coupling agent A-172;

[0145] 50 parts of kaolin;

[0146] 5 parts of dicumyl peroxide;

[0147] 5 parts of triallyl isocyanurate; and,

[0148] 3 parts of toner;

[0149] Among them, the mass content of chlorine in chlorinated polyethylene is 35%, and the mass content of vinyl acetate in ethylene-vinyl acetate copolymer is 65%.

[0150] Example 4

[0151] Prepare the sheath material according to the method of Example 1, the difference is only that the mass fraction of chlorinated polyethylene is 45 parts, and the mass ratio of chlorinated polyethylene to ethylene-vinyl acetate copolymer is 1.8:1.

[0152] Example 5

[0153] The sheath material was prepared according to the method of Example 1, except that the mass fraction of chlorinated polyethylene was 95 parts, and the mass ratio of chlorinated polyethylene to ethylene-vinyl acetate copolymer was 3.8:1.

[0154] Example 6

[0155] The sheath material was prepared according to the method of Example 1, except that the mass fraction of kaolin was 80 parts, and the total mass of chlorinated polyethylene and ethylene-vinyl acetate copolymer accounted for 38% of the total mass of the preparation raw materials.

[0156] Example 7

[0157] The sheath material was prepared according to the method of Example 1, except that the mass fraction of kaolin was 40 parts, and the total mass of chlorinated polyethylene and ethylene-vinyl acetate copolymer accounted for 45.5% of the total mass of the preparation raw materials.

[0158] Example 8

[0159] The sheath material was prepared according to the method of Example 1, except that the antioxidant was replaced with antioxidant RD, i.e., 2,2,4-trimethyl-1,2-dihydroquinoline polymer.

[0160] Example 9

[0161] The sheath material was prepared according to the method of Example 1, except that the combination of hydrotalcite and antimony trioxide in the flame retardant was replaced with antimony trioxide.

[0162] Example 10

[0163] The sheath material was prepared according to the method of Example 1, except that the combination of hydrotalcite and antimony trioxide in the flame retardant was replaced with hydrotalcite.

[0164] Example 11

[0165] The sheath material was prepared according to the method of Example 1, except that the plasticizer was replaced with dioctyl phthalate of the same mass fraction.

[0166] Example 12

[0167] The sheath material was prepared according to the method of Example 1, except that the discharging temperature of the mixer in step S3 was 120 °C.

[0168] Example 13

[0169] The sheath material was prepared according to the method of Example 1, except that the semi-refined paraffin was replaced with polyethylene wax of the same mass fraction.

[0170] Example 14

[0171] The sheath material was prepared according to the method of Example 1, except that the polyethylene wax was replaced with semi-refined paraffin wax in the same mass fraction.

[0172] Comparative Example 1

[0173] The sheath material was prepared according to the method of Example 1, except that the mass content of chlorine in the chlorinated polyethylene was 35%.

[0174] Comparative Example 2

[0175] The sheath material was prepared according to the method of Example 1, except that the mass content of chlorine in the chlorinated polyethylene was 25%.

[0176] Comparative Example 3

[0177] The sheath material was prepared according to the method of Example 1, except that the mass fraction of vinyl acetate in the ethylene-vinyl acetate copolymer was 40%.

[0178] Comparative Example 4

[0179] The sheath material was prepared according to the method of Example 1, except that the mass fraction of vinyl acetate in the ethylene-vinyl acetate copolymer was 50%.

[0180] Comparative Example 5

[0181] The sheath material was prepared according to the method of Example 1, except that the mass fraction of vinyl acetate in the ethylene-vinyl acetate copolymer was 80%.

[0182] Comparative Example 6

[0183] The sheath material was prepared according to the method of Example 1, except that the ethylene-vinyl acetate copolymer was replaced with chlorinated polyethylene in the same mass fraction.

[0184] Comparative Example 7

[0185] The sheath material was prepared according to the method of Example 1, except that the chlorinated polyethylene was replaced with ethylene-vinyl acetate copolymer in the same mass fraction.

[0186] Comparative Example 8

[0187] The sheath material was prepared according to the method of Example 1, except that no antioxidant was added.

[0188] Comparative Example 9

[0189] The sheath material was prepared according to the method of Example 1, except that no flame retardant was added.

[0190] Comparative Example 10

[0191] The sheath material was prepared according to the method of Example 1, except that no plasticizer was added.

[0192] The present application also provides a cable, including a plurality of cores and a sheath layer covering the plurality of cores, and the material of the sheath layer includes the sheath materials in the above-mentioned examples and comparative examples.

[0193] The sheath materials prepared in the above-mentioned examples and comparative examples were pressed at 175 °C and 15 MPa for 15 minutes to obtain test samples, and performance tests were carried out on the test samples of the above-mentioned examples and comparative examples, including:

[0194] The mechanical property test was carried out with reference to the standard of GB / T2951.11-2008;

[0195] The air heat aging test was carried out with reference to the standard of GB / T2951.12-2008, and the test conditions were: 158 °C × 7 days;

[0196] The oxygen index was carried out with reference to the standard of GB5454-85;

[0197] The ozone resistance test was carried out with reference to the standard of GB / T2951.21-2008, and the test conditions were: 25 ± 2 °C × 24 h, ozone concentration (0.025% - 0.030%);

[0198] The thermal elongation test was carried out with reference to the standard of GB / T2951.21-2008, and the test conditions were: 200 ± 3 °C × 15 minutes, mechanical stress 0.20 N / mm 2 .

[0199] The test results are shown in Table 1.

[0200] Table 1

[0201]

[0202]

[0203] It can be seen from the above table that:

[0204] (1) Comparing Example 1 with Examples 4-5, it can be seen that the present application controls the mass ratio of chlorinated polyethylene to ethylene-vinyl acetate copolymer, and through synergistic cooperation, it improves the mechanical properties and high-temperature resistance of the material, while facilitating processing operations.

[0205] (2) Comparing Example 1 with Examples 6-7, it can be seen that the present application controls the total mass of chlorinated polyethylene and ethylene-vinyl acetate copolymer accounting for the total mass of the preparation raw materials. Not only is the density of the material small, but also it can synergistically cooperate to improve the mechanical properties and high-temperature resistance of the material, and the material has excellent aging resistance, avoiding the deterioration of mechanical properties after aging.

[0206] (3) Compared with Examples 8-11, it can be seen that through the synergistic cooperation of the anti-aging agent, flame retardant and plasticizer, the anti-aging effect and flame retardant performance of the material are effectively improved, and the mechanical properties and high temperature resistance of the material are comprehensively improved in the present application.

[0207] (4) Compared with Example 12, it can be seen that in the present application, the mixing temperature is controlled to ensure uniform mixing of raw materials, and harmful substances such as small molecule substances and moisture in the raw materials volatilize sufficiently, so as to avoid affecting the tensile strength and tear strength of the finished rubber compound.

[0208] (5) Compared with Examples 13-14, it can be seen that by selecting polyethylene wax as the lubricant in the present application, it can cooperate synergistically with chlorinated polyethylene and ethylene-vinyl acetate copolymer to improve the aging resistance and high temperature resistance of the material.

[0209] (6) Compared with Comparative Examples 1-5, it can be seen that in the present application, the mass content of chlorine in chlorinated polyethylene and the mass ratio of vinyl acetate in ethylene-vinyl acetate copolymer are controlled, and the mechanical strength, high temperature resistance and flame retardant performance of the material are improved synergistically, and the raw materials have good processing performance.

[0210] (7) Compared with Comparative Examples 6-10, it can be seen that through the synergistic cooperation of chlorinated polyethylene and ethylene-vinyl acetate copolymer, the high temperature resistance and mechanical properties of the sheath material are effectively guaranteed. In addition, by adding anti-aging agent, flame retardant, plasticizer and additives for synergistic cooperation, the high temperature resistance and aging resistance of the sheath material are significantly improved. The high temperature resistance temperature of the sheath material of the present application can reach above 125°C.

[0211] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0212] The above-described embodiments merely represent several implementation manners of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A sheath material, characterized in that, The raw materials for preparing the sheath material, by mass fraction, include: 60 to 70 parts of chlorinated polyethylene; 20 to 30 parts of ethylene-vinyl acetate copolymer; 1 to 2 parts of antioxidant; 15 to 25 parts of flame retardant; 5 to 10 parts of plasticizer; 14 to 18 parts of reinforcing agent; 18 to 30 parts of lubricant; 0.5 to 1 part of coupling agent; 40 to 60 parts of filler; 2 to 5 parts of crosslinking agent; 2 to 5 parts of co-crosslinking agent; and, 1 to 3 parts of color powder; Among them, the mass ratio of the chlorinated polyethylene to the ethylene-vinyl acetate copolymer is (2 to 3.5):1, the total mass of the chlorinated polyethylene and the ethylene-vinyl acetate copolymer accounts for 40% to 43% of the total mass of the raw materials for preparing the sheath material, the mass content of vinyl acetate units in the ethylene-vinyl acetate copolymer is 60% to 70%, the mass content of chlorine in the chlorinated polyethylene is 28% to 32%, the antioxidant includes nickel dibutyldithiocarbamate, the flame retardant includes hydrotalcite and antimony trioxide, the plasticizer includes trioctyl trimellitate, the lubricant includes polyethylene wax; The method for preparing the sheath material includes the following steps: mixing the chlorinated polyethylene, the ethylene-vinyl acetate copolymer, the antioxidant, the flame retardant, the plasticizer, the reinforcing agent, the lubricant, the coupling agent, the filler, the crosslinking agent, the co-crosslinking agent and the color powder at 130°C to 135°C to prepare the sheath material.

2. The sheath material according to claim 1, wherein The raw materials for preparing the sheath material meet at least one of the following conditions: (1) The filler includes at least one of kaolin, talcum powder and calcium carbonate; (2) The reinforcing agent includes at least one of silica and carbon black; (3) The crosslinking agent includes at least one of dicumyl peroxide and 2,4-di-tert-butylperoxyisopropylbenzene; (4) The co-crosslinking agent includes at least one of triallyl isocyanurate and triallyl cyanurate; (5) The number-average molecular weight of the polyethylene wax is 3000 to 5000.

3. Use of the sheath material according to claim 1 or 2 in the preparation of power transmission articles.

4. A cable, characterized in that, The cable includes the sheath material according to claim 1 or 2.

Images