Sheath material, its preparation method, application and cable

Abstract

This application belongs to the technical field of cables, and provides a sheath material, a preparation method, an application thereof, and a cable. The raw materials for preparing the sheath material include chlorinated polyethylene, ethylene-propylene rubber, diisodecyl sebacate, filler, plasticizer, acid absorbent, moisture absorbent, and auxiliary agent. The sheath material prepared in this application has excellent ozone resistance, low temperature resistance, and high temperature resistance.

Description

Technical Field

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

[0002] Chlorinated polyethylene rubber is an elastic polymer made by replacing chlorine in polyethylene through a substitution reaction, and is widely used in cable sheaths with low requirements for mechanical properties and temperature resistance. With the change of the application environment of cables, higher requirements are put forward for the low-temperature resistance and high-temperature resistance of cable sheath materials. For example, in deserts or gobi, the temperature difference between day and night can reach 40°C to 60°C. Transmission cables need to meet the requirements of high-temperature resistance and low-temperature resistance simultaneously in this working environment, and for wind power cables, they also need to meet the requirement of torsion resistance simultaneously. Therefore, how to provide a cable sheath material that can meet both low-temperature resistance 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 both low-temperature resistance and high-temperature resistance, a preparation method, an application thereof, and a cable.

[0004] In a first aspect, the present application provides a sheath material, and the preparation raw materials of the sheath material include chlorinated polyethylene, ethylene-propylene rubber, diisodecyl sebacate, filler, plasticizer, acid absorbent, moisture absorbent, and auxiliary agent.

[0005] In some embodiments, by mass, the preparation raw materials of the sheath material include:

[0006] 80 parts to 100 parts of chlorinated polyethylene;

[0007] 12 parts to 25 parts of ethylene-propylene rubber;

[0008] 8 parts to 15 parts of diisodecyl sebacate;

[0009] 15 parts to 30 parts of filler;

[0010] 19 parts to 33 parts of plasticizer;

[0011] 38 parts to 65 parts of acid absorbent;

[0012] 5 parts to 10 parts of moisture absorbent; and

[0013] 14.4 parts to 29.8 parts of auxiliary agent.

[0014] In some embodiments, the ethylene-propylene rubber includes at least one of binary ethylene-propylene rubber, modified binary ethylene-propylene rubber, and ternary ethylene-propylene rubber.

[0015] Optionally, the mass percentage of ethylene units in the binary ethylene-propylene rubber is 55% - 60%.

[0016] In some embodiments, the ethylene-propylene rubber includes a modified binary ethylene-propylene rubber.

[0017] Optionally, the modified binary ethylene-propylene rubber includes a glycidyl methacrylate-grafted modified binary ethylene-propylene rubber.

[0018] In some embodiments, the filler includes at least one of silica and carbon black.

[0019] In some embodiments, the plasticizer includes at least one of cylinder oil and chlorinated paraffin oil.

[0020] In some embodiments, the acid absorbent includes at least one of magnesium hydroxide and magnesium oxide.

[0021] In some embodiments, the moisture absorbent includes calcium oxide.

[0022] In some embodiments, the auxiliary agent includes at least one of a flame retardant, a stabilizer, a coupling agent, an antioxidant, a vulcanizing agent, a co-vulcanizing agent, and a lubricant.

[0023] Optionally, the auxiliary agent includes a flame retardant, a stabilizer, a coupling agent, an antioxidant, a vulcanizing agent, a co-vulcanizing agent, and a lubricant. By mass, the raw materials for preparing the sheath material include:

[0024] Chlorinated polyethylene 80 parts - 100 parts;

[0025] Ethylene-propylene rubber 12 parts - 25 parts;

[0026] Didecyl sebacate 8 parts - 15 parts;

[0027] Filler 15 parts - 30 parts;

[0028] Plasticizer 19 parts - 33 parts;

[0029] Acid absorbent 38 parts - 65 parts;

[0030] Moisture absorbent 5 parts - 10 parts;

[0031] Flame retardant 5 parts - 10 parts;

[0032] Stabilizer 1 part - 2 parts;

[0033] Coupling agent 0.4 parts - 0.8 parts;

[0034] Antioxidant 1.0 parts - 2.5 parts;

[0035] Vulcanizing agent 2 parts - 4 parts;

[0036] 2.5 to 4.5 parts of vulcanization accelerator; and,

[0037] 3 to 6 parts of lubricant.

[0038] In some embodiments, the antioxidant includes at least one of octylated diphenylamine, N,N'-dimethyl-p-phenylenediamine, and 4,4'-bis(α,α-dimethylbenzyl) diphenylamine.

[0039] Optionally, the antioxidant includes octylated diphenylamine, N,N'-dimethyl-p-phenylenediamine, and 4,4'-bis(α,α-dimethylbenzyl) diphenylamine.

[0040] Further optionally, the mass ratio of octylated diphenylamine, N,N'-dimethyl-p-phenylenediamine, and 4,4'-bis(α,α-dimethylbenzyl) diphenylamine is (0.8 to 1.2):(0.8 to 1.2):(0.8 to 1.2).

[0041] In some embodiments, the flame retardant includes antimony trioxide.

[0042] In some embodiments, the stabilizer includes lead oleate.

[0043] In some embodiments, the coupling agent includes vinyltris(β-methoxyethoxy) silane.

[0044] In some embodiments, the vulcanizing agent includes 2,4-di-tert-butylcumyl peroxide; the vulcanization accelerator includes trimethylolpropane trimethacrylate.

[0045] In some embodiments, the lubricant includes microcrystalline wax.

[0046] 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:

[0047] Mixing the chlorinated polyethylene, the ethylene-propylene rubber, the dioctyl sebacate, the filler, the plasticizer, the acid absorbent, the moisture absorbent, and the auxiliary agent to prepare the sheath material.

[0048] 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.

[0049] In a fourth aspect, the present application provides a cable, the cable including the sheath material as described in the first aspect.

[0050] Compared with the traditional technology, the present application has at least the following beneficial effects:

[0051] In this application, by blending a part of ethylene-propylene rubber and diisodecyl sebacate in chlorinated polyethylene, not only can the plasticizing effect be achieved, reducing the dosage of plasticizer, but also the ozone resistance, high-temperature resistance and low-temperature resistance of the sheath material can be synergistically improved. In addition, the acid absorbent and moisture absorbent can absorb hydrogen chloride and water generated during the mixing process of chlorinated polyethylene, thus avoiding the formation of pores in the sheath material and effectively ensuring the mechanical properties of the sheath material. Detailed implementation manners

[0052] The following will further describe this application in detail in combination with the implementation manners and examples. These implementation manners and examples are only used to illustrate this application and not to limit the scope of this application. The purpose of providing these implementation manners and examples is to make the understanding of the disclosed content of this application more thorough and comprehensive. It should also be understood that this application can be implemented in many different forms and is not limited to the implementation manners and examples described herein. Those skilled in the art can make various changes or modifications without departing from the connotation of this application, and the equivalent forms obtained also fall within the protection scope of this application. In addition, in the following description, a large number of specific details are given to provide a more thorough understanding of this application. It should be understood that this application can be implemented without one or more of these details.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0054] In this application, "optionally", "optional", "option", mean that it can be either present or absent, that is, it refers to any one of two alternative schemes of "present" or "absent". If "optional" appears in multiple places in a technical solution, without special instructions and without contradictions or mutual constraints, each "optional" is independent of each other.

[0055] In this application, in "the first aspect", "the second aspect", etc., the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", etc. only serve the purpose of non-exhaustive listing and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0056] In this application, for the technical features described in an open-ended manner, it includes a closed technical solution composed of the listed features, as well as an open technical solution including the listed features.

[0057] In this application, when it comes to 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 value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. The "numerical interval" is allowed to broadly include quantitative intervals such as percentage intervals, ratio intervals, and ratio value intervals.

[0058] All documents mentioned in this application are cited as references in this application, just as if each document was cited separately as a reference. Unless it conflicts with the application purpose and / or technical solution of this application, the cited documents involved in this application are cited for all contents and all purposes. 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 methods of the relevant technical features cited can also be included as references in this application, but only to the extent that 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.

[0059] In traditional technologies, both chlorinated polyethylene rubber and ethylene-propylene rubber can be used as the sheath materials for cables. However, chlorinated polyethylene rubber not only has poor ozone resistance but also poor low-temperature resistance; ethylene-propylene rubber has problems such as poor flame retardancy, poor oil resistance, poor abrasion resistance, and poor tear resistance. This application studies and discovers that adding ethylene-propylene rubber and diisodecyl sebacate to chlorinated polyethylene can effectively improve the high-temperature resistance and low-temperature resistance of the sheath material, and make the sheath material have ozone resistance and high mechanical strength.

[0060] In the first aspect of this application, a sheath material is provided. The preparation raw materials of the sheath material include chlorinated polyethylene, ethylene-propylene rubber, diisodecyl sebacate, filler, plasticizer, acid absorbent, moisture absorbent, and auxiliary agent.

[0061] In some embodiments, by mass parts, the preparation raw materials of the sheath material include:

[0062] 80 parts to 100 parts of chlorinated polyethylene;

[0063] 12 parts to 25 parts of ethylene-propylene rubber;

[0064] 8 to 15 parts of didecyl sebacate;

[0065] 15 to 30 parts of filler;

[0066] 19 to 33 parts of plasticizer;

[0067] 38 to 65 parts of acid absorbent;

[0068] 5 to 10 parts of moisture absorbent; and,

[0069] 14.4 to 29.8 parts of auxiliary agent.

[0070] For example, the mass parts of chlorinated polyethylene can be 80 parts, 82 parts, 84 parts, 86 parts, 88 parts, 90 parts, 92 parts, 94 parts, 96 parts, 98 parts or 100 parts. The mass parts of ethylene-propylene rubber can be 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts or 25 parts. The mass parts of didecyl sebacate can be 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts. The mass parts of filler can be 15 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts or 30 parts. The mass parts of plasticizer can be 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts or 33 parts. The mass parts of acid absorbent can be 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts, 62 parts, 64 parts or 65 parts. The mass parts of moisture absorbent can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts. The mass parts of auxiliary agent can be 14.4 parts, 15 parts, 16 parts, 17 parts, 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 29.8 parts.

[0071] In this application, the addition amount of ethylene-propylene rubber in the sheath material is appropriately selected and cooperates synergistically with chlorinated polyethylene and didecyl sebacate to ensure that the sheath material has good ozone resistance, low temperature resistance and oil resistance, and effectively avoids problems such as cracking of the sheath layer. If the addition amount is relatively small, the ozone resistance of the sheath material may be poor; if the addition amount is relatively large, the oil resistance of the sheath material may be poor.

[0072] In some embodiments, the ethylene-propylene rubber includes at least one of binary ethylene-propylene rubber, modified binary ethylene-propylene rubber and ternary ethylene-propylene rubber. Preferably, it is binary ethylene-propylene rubber.

[0073] In this application, the ethylene-propylene rubber is preferably binary ethylene-propylene rubber, which has better heat aging resistance compared with ternary ethylene-propylene rubber. In addition, by adding a part of modified binary ethylene-propylene rubber in this application, the compatibility between chlorinated polyethylene, ethylene-propylene rubber and powder filler can be improved, thereby improving the mixing uniformity during the processing and enhancing the mechanical properties of the rubber compound.

[0074] Optionally, the mass ratio of the ethylene unit in the binary ethylene-propylene rubber is 55% - 60%, for example, it can be 55%, 56%, 57%, 58%, 59% or 60%.

[0075] In this application, the content of the ethylene unit in the binary ethylene-propylene rubber is appropriately selected to improve the heat resistance, abrasion resistance and weather resistance of the sheath material. If the mass ratio is relatively small, it may lead to lower mechanical properties and poorer heat resistance of the sheath material; if the mass ratio is relatively large, there may be a problem of poorer cold resistance performance.

[0076] In some embodiments, the Mooney viscosity ML100℃(1 + 4) of the binary ethylene-propylene rubber is 40 - 50. Among them, in ML100℃(1 + 4), M represents Mooney, L represents using a large rotor, the test temperature is 125℃, the preheating time is 1 min, and the rotation time is 4 min.

[0077] Optionally, the modified binary ethylene-propylene rubber includes glycidyl methacrylate grafted modified binary ethylene-propylene rubber. Optionally, the mass ratio of glycidyl methacrylate in the modified binary ethylene-propylene rubber is 0.3% - 1%.

[0078] In some embodiments, the Mooney viscosity ML125℃(1 + 4) of the chlorinated polyethylene is 60 - 70. 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 min, and the rotation time is 4 min. The hardness (Shore A) of the chlorinated polyethylene is 50 - 60, and the chlorine content is 34% - 36%. The chlorine content refers to the mass content of chlorine element in the chlorinated polyethylene.

[0079] In some embodiments, the filler includes at least one of silica and carbon black. Optionally, the filler includes silica and carbon black. Further optionally, by mass parts, the preparation raw materials include: silica, 10 parts - 20 parts; and carbon black, 5 parts - 10 parts.

[0080] In some embodiments, the plasticizer includes at least one of cylinder oil and chlorinated paraffin oil. Optionally, the plasticizer includes cylinder oil and chlorinated paraffin oil. Further optionally, by mass parts, the preparation raw materials include: cylinder oil, 4 parts - 8 parts; and chlorinated paraffin oil, 15 parts - 25 parts.

[0081] In some embodiments, the cylinder oil includes 1000# cylinder oil. The chlorinated paraffin oil includes 52# chlorinated paraffin oil.

[0082] In this application, adding a part of cylinder oil to the chlorinated paraffin oil can not only improve its low-temperature resistance, but also enhance the aging resistance of the sheath material.

[0083] In some embodiments, the acid absorbent includes at least one of magnesium hydroxide and magnesium oxide. Optionally, the acid absorbent includes magnesium hydroxide and magnesium oxide. Further optionally, by mass parts, the preparation raw materials include: magnesium hydroxide, 30 parts to 50 parts; and magnesium oxide, 8 parts to 15 parts.

[0084] In this application, magnesium oxide and magnesium hydroxide cooperate synergistically and can act as an acid absorbent to absorb hydrogen chloride gas generated during the mixing process and vulcanization process of the sheath material, avoiding the formation of pores inside the sheath material and affecting the mechanical properties. In addition, magnesium hydroxide can also improve the flame retardancy of the sheath material.

[0085] In some embodiments, the moisture absorbent includes calcium oxide. Optionally, the calcium oxide includes a masterbatch of ethylene-propylene rubber substrate with an effective content of 80%.

[0086] In some embodiments, the auxiliary agent includes at least one of a flame retardant, a stabilizer, a coupling agent, an antioxidant, a vulcanizing agent, a co-vulcanizing agent, and a lubricant.

[0087] Optionally, the auxiliary agent includes a flame retardant, a stabilizer, a coupling agent, an antioxidant, a vulcanizing agent, a co-vulcanizing agent, and a lubricant. By mass parts, the preparation raw materials of the sheath material include:

[0088] Chlorinated polyethylene 80 parts to 100 parts;

[0089] Ethylene-propylene rubber 12 parts to 25 parts;

[0090] Didecyl sebacate 8 parts to 15 parts;

[0091] Filler 15 parts to 30 parts;

[0092] Plasticizer 19 parts to 33 parts;

[0093] Acid absorbent 38 parts to 65 parts;

[0094] Moisture absorbent 5 parts to 10 parts;

[0095] Flame retardant 5 parts to 10 parts;

[0096] Stabilizer 1 part to 2 parts;

[0097] Coupling agent 0.4 parts to 0.8 parts;

[0098] Antioxidant: 1.0 to 2.5 parts;

[0099] Vulcanizing agent: 2 to 4 parts;

[0100] Cocuring agent: 2.5 to 4.5 parts; and,

[0101] Lubricant: 3 to 6 parts.

[0102] For example, the mass fraction of the flame retardant can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts. The mass fraction of the stabilizer 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 mass fraction of the coupling agent can be 0.4 part, 0.5 part, 0.6 part, 0.7 part or 0.8 part. The mass fraction of the antioxidant can be 1.0 part, 1.1 parts, 1.3 parts, 1.5 parts, 1.7 parts, 1.9 parts, 2.1 parts, 2.3 parts or 2.5 parts. The mass fraction of the vulcanizing agent can be 2.0 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3.0 parts, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts or 4.0 parts. The mass fraction of the cocuring agent can be 2.5 parts, 2.7 parts, 2.9 parts, 3.1 parts, 3.3 parts, 3.5 parts, 3.7 parts, 3.9 parts, 4.1 parts, 4.3 parts or 4.5 parts. The mass fraction of the lubricant can be 3.0 parts, 3.3 parts, 3.6 parts, 3.9 parts, 4.2 parts, 4.5 parts, 4.8 parts, 5.1 parts, 5.4 parts, 5.7 parts or 6.0 parts.

[0103] In some embodiments, the antioxidant includes at least one of octylated diphenylamine, N,N'-dimethylphenyl-p-phenylenediamine and 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

[0104] Optionally, the antioxidant includes octylated diphenylamine, N,N'-dimethylphenyl-p-phenylenediamine and 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

[0105] Further optionally, the mass ratio of octylated diphenylamine, N,N'-dimethylphenyl-p-phenylenediamine and 4,4'-bis(α,α-dimethylbenzyl)diphenylamine is (0.8 to 1.2):(0.8 to 1.2):(0.8 to 1.2), and can be optionally 1:0.8:0.9.

[0106] This application uses octylated diphenylamine, N,N'-dimethylphenyl-p-phenylenediamine and 4,4'-bis(α,α-dimethylbenzyl)diphenylamine as an antioxidant system, which synergistically cooperate to improve the heat air aging resistance, ozone aging resistance and torsional fatigue resistance of the sheath material.

[0107] In some embodiments, the flame retardant includes antimony trioxide.

[0108] In some embodiments, the stabilizer includes lead oleate.

[0109] In some embodiments, the coupling agent includes vinyltris(β-methoxyethoxy)silane.

[0110] In this application, vinyltris(β-methoxyethoxy)silane is selected as the coupling agent, which can effectively ensure that the rubber base material and the powder material are combined to form a stable whole.

[0111] In some embodiments, the vulcanizing agent includes 2,4-di-tert-butylcumyl peroxide; the co-vulcanizing agent includes trimethylolpropane trimethacrylate.

[0112] In this application, through the synergistic cooperation of lead oleate, acid absorbent and co-vulcanizing agent trimethylolpropane trimethacrylate, hydrogen chloride and water molecules formed during the production process of the sheath material are avoided from forming bubbles in the sheath material, which affects the mechanical properties. In addition, by appropriately selecting the mass fraction of the co-vulcanizing agent, it can cooperate with the moisture absorbent calcium oxide to avoid the formation of bubbles by water molecules in the sheath material and improve the mechanical properties and heat resistance of the sheath material.

[0113] In some embodiments, the lubricant includes microcrystalline wax.

[0114] In this application, microcrystalline wax is used as the lubricant, which can not only improve the processing performance, but also cooperate to improve the ozone resistance effect of the sheath material.

[0115] In some embodiments, by mass fraction, the raw materials for preparing the sheath material include:

[0116] Chlorinated polyethylene 80 parts - 100 parts;

[0117] Ethylene propylene rubber 10 parts - 20 parts;

[0118] Modified ethylene propylene rubber 2 parts - 5 parts;

[0119] Didecyl sebacate 8 parts - 15 parts;

[0120] Silica 10 parts - 20 parts;

[0121] Carbon black 5 parts - 10 parts;

[0122] Cylinder oil 4 parts - 8 parts;

[0123] Chlorinated paraffin oil 15 parts - 25 parts;

[0124] Magnesium hydroxide 30 parts - 50 parts;

[0125] 8 to 15 parts of magnesium oxide;

[0126] 5 to 10 parts of calcium oxide;

[0127] 5 to 10 parts of antimony trioxide;

[0128] 1 to 2 parts of lead oleate;

[0129] 0.4 to 0.8 part of vinyltris(β-methoxyethoxy)silane;

[0130] 1.0 to 2.5 parts of antioxidant;

[0131] 2 to 4 parts of 2,4-di-tert-butylperoxycumene;

[0132] 2.5 to 4.5 parts of trimethylolpropane trimethacrylate; and,

[0133] 3 to 6 parts of microcrystalline wax.

[0134] The second aspect of the present application provides a preparation method of the sheath material as described in the first aspect, and the preparation method includes:

[0135] Mixing the chlorinated polyethylene, the ethylene-propylene rubber, the dioctyl sebacate, the filler, the plasticizer, the acid absorbent, the moisture absorbent and the auxiliary agent to prepare the sheath material.

[0136] In some embodiments, the preparation method includes:

[0137] S1. Weigh the preparation raw materials according to the parts by mass, and add the chlorinated polyethylene and the ethylene-propylene rubber into a kneader for mixing;

[0138] S2. Add the antioxidant, the stabilizer, the lubricant and the first acid absorbent into the kneader in step S1 and continue mixing;

[0139] S3. Add the first plasticizer, the flame retardant, the dioctyl sebacate, the first filler, the coupling agent and the moisture absorbent into the kneader in step S2, and mix until the rubber compound forms a mass;

[0140] S4. Add the second acid absorbent, the second plasticizer and the second filler into the kneader in step S3, and mix until the rubber compound forms a mass;

[0141] S5. When the temperature of the rubber compound in step S4 reaches 85°C to 95°C, add the vulcanizing agent and the vulcanization accelerator into the kneader, and mix until the rubber compound forms a mass;

[0142] S6. When the temperature of the rubber compound in step S5 reaches 100°C to 110°C, discharge the material.

[0143] 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.

[0144] The fourth aspect of the present application provides a cable, and the cable includes the sheath material as described in the first aspect.

[0145] In some embodiments, the cable includes a plurality of cores and a sheath layer covering the plurality of cores.

[0146] The following will describe in detail the implementation schemes of the present application 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, the guidance given in the present application is preferably referred to, and it can also be in accordance with the experimental manuals or conventional conditions in the art, or in accordance with the conditions recommended by the manufacturer, or refer to the experimental methods known in the art.

[0147] Chlorinated polyethylene is purchased from Weifang Shuoyi, with the brand number 3675.

[0148] Cylinder oil is purchased from Caltex, with the brand number 1000#.

[0149] Chlorinated paraffin oil is purchased from Luxi Chemical Industry, with the brand number 52#.

[0150] Microcrystalline wax is purchased from Fushun Petrochemical, with the brand number 80# microcrystalline wax.

[0151] Example 1

[0152] S1. Weigh the preparation raw materials according to parts by mass, including:

[0153] 100 parts of chlorinated polyethylene;

[0154] 10 parts of ethylene propylene diene monomer rubber;

[0155] 2 parts of modified ethylene propylene diene monomer rubber;

[0156] 15 parts of diisodecyl sebacate;

[0157] 20 parts of silica;

[0158] 10 parts of carbon black;

[0159] 4 parts of cylinder oil;

[0160] 15 parts of chlorinated paraffin oil;

[0161] 40 parts of magnesium hydroxide;

[0162] 12 parts of magnesium oxide;

[0163] 10 parts of calcium oxide;

[0164] 10 parts of antimony trioxide;

[0165] 1.5 parts of lead oleate;

[0166] 0.8 part of coupling agent;

[0167] 1.5 parts of antioxidant;

[0168] 4 parts of vulcanizing agent;

[0169] 4 parts of vulcanization accelerator; and,

[0170] 3 parts of microcrystalline wax.

[0171] Among them, the modified ethylene-propylene rubber is glycidyl methacrylate grafted modified binary ethylene-propylene rubber, and the grafting rate of glycidyl methacrylate is 0.5%. The mass ratio of ethylene unit in the binary ethylene-propylene rubber is 57%. The coupling agent is vinyltris(β-methoxyethoxy)silane. The antioxidant is octylated diphenylamine, N,N'-dimethylphenyl-p-phenylenediamine and 4,4'-bis(α,α-dimethylbenzyl)diphenylamine with a mass ratio of 1:0.8:0.9. The vulcanizing agent is 2,4-di-tert-butylcumyl peroxide, and the vulcanization accelerator is trimethylolpropane trimethacrylate.

[0172] Add chlorinated polyethylene and ethylene-propylene rubber to an internal mixer and mix for 30 s;

[0173] S2. Add the antioxidant, lead oleate, microcrystalline wax and magnesium oxide to the internal mixer in step S1 and continue to mix for 1 min;

[0174] S3. Add cylinder oil, antimony trioxide, dioctyl sebacate, silica, coupling agent and calcium oxide to the internal mixer in step S2 and mix until the rubber compound forms a mass;

[0175] S4. Add magnesium hydroxide, chlorinated paraffin oil and carbon black to the internal mixer in step S3 and mix until the rubber compound forms a mass;

[0176] S5. When the temperature of the rubber compound in step S4 reaches 90 °C, add the vulcanizing agent and vulcanization accelerator to the internal mixer and mix until the rubber compound forms a mass;

[0177] S6. When the temperature of the rubber compound in step S5 reaches 105 °C, discharge the rubber compound to a conical twin-screw forced feeding rubber filtering machine, control the temperature of the double cone at 100 °C, control the temperature of the rubber filtering machine body at 95 °C, 95 °C, 95 °C, and control the temperature of the machine head at 90 °C. Among them, a filter screen is installed in front of the honeycomb plate at the granulating machine head, and the filter screen combination is 60 mesh + 80 mesh + 60 mesh to prepare the described sheath material.

[0178] Example 2

[0179] Prepare the sheath material according to the method of Example 1, and the difference is only that the preparation raw materials include:

[0180] 90 parts of chlorinated polyethylene;

[0181] 15 parts of ethylene propylene diene monomer rubber;

[0182] 3 parts of modified ethylene propylene diene monomer rubber;

[0183] 8 parts of dioctyl sebacate;

[0184] 15 parts of silica white;

[0185] 8 parts of carbon black;

[0186] 6 parts of cylinder oil;

[0187] 20 parts of chlorinated paraffin oil;

[0188] 30 parts of magnesium hydroxide;

[0189] 15 parts of magnesium oxide;

[0190] 5 parts of calcium oxide;

[0191] 8 parts of antimony trioxide;

[0192] 2 parts of lead oleate;

[0193] 0.4 part of coupling agent;

[0194] 1.0 part of antioxidant;

[0195] 2 parts of vulcanizing agent;

[0196] 4.5 parts of vulcanization accelerator; and,

[0197] 6 parts of microcrystalline wax.

[0198] Example 3

[0199] The sheath material was prepared according to the method of Example 1, except that the preparation raw materials included:

[0200] 80 parts of chlorinated polyethylene;

[0201] 20 parts of ethylene propylene diene monomer rubber;

[0202] 5 parts of modified ethylene propylene diene monomer rubber;

[0203] 12 parts of dioctyl sebacate;

[0204] 10 parts of silica white;

[0205] 5 parts of carbon black;

[0206] 8 parts of cylinder oil;

[0207] 25 parts of chlorinated paraffin oil;

[0208] 50 parts of magnesium hydroxide;

[0209] 8 parts of magnesium oxide;

[0210] 8 parts of calcium oxide;

[0211] 5 parts of antimony trioxide;

[0212] 1 part of lead oleate;

[0213] 0.6 part of coupling agent;

[0214] 2.5 parts of antioxidant;

[0215] 3 parts of vulcanizing agent;

[0216] 2.5 parts of vulcanization accelerator; and,

[0217] 5 parts of microcrystalline wax.

[0218] Example 4

[0219] Prepare the sheath material according to the method of Example 1, the difference is only that the mass parts of ethylene propylene diene monomer are replaced by 5 parts.

[0220] Example 5

[0221] Prepare the sheath material according to the method of Example 1, the difference is only that the mass parts of ethylene propylene diene monomer are replaced by 30 parts.

[0222] Example 6

[0223] Prepare the sheath material according to the method of Example 1, the difference is only that ethylene propylene diene monomer is replaced by ethylene propylene diene monomer with the same mass parts.

[0224] Example 7

[0225] Prepare the sheath material according to the method of Example 1, the difference is only that the modified ethylene propylene diene monomer is replaced by ethylene propylene diene monomer with the same mass parts.

[0226] Example 8

[0227] Prepare the sheath material according to the method of Example 1, the difference is only that the cylinder oil is replaced by chlorinated paraffin oil with the same mass parts.

[0228] Example 9

[0229] Prepare the sheath material according to the method of Example 1, the difference is only that the magnesium oxide is replaced by magnesium hydroxide with the same mass parts.

[0230] Example 10

[0231] The sheath material was prepared according to the method of Example 1, except that the antioxidant was replaced with antioxidant RD.

[0232] Example 11

[0233] The sheath material was prepared according to the method of Example 1, except that the antioxidant was replaced with a 1:1 mass ratio of octylated diphenylamine and N,N'-dimethylphenyl-p-phenylenediamine.

[0234] Example 12

[0235] The sheath material was prepared according to the method of Example 1, except that the antioxidant was replaced with a 1:1 mass ratio of N,N'-dimethylphenyl-p-phenylenediamine and 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

[0236] Example 13

[0237] The sheath material was prepared according to the method of Example 1, except that the antioxidant was replaced with a 1:1 mass ratio of octylated diphenylamine and 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

[0238] Example 14

[0239] The sheath material was prepared according to the method of Example 1, except that the mass fraction of the co-vulcanizing agent was adjusted to 2 parts.

[0240] Comparative Example 1

[0241] The sheath material was prepared according to the method of Example 1, except that ethylene-propylene rubber and modified ethylene-propylene rubber were not added.

[0242] Comparative Example 2

[0243] The sheath material was prepared according to the method of Example 1, except that dioctyl sebacate was not added.

[0244] Comparative Example 3

[0245] The sheath material was prepared according to the method of Example 1, except that magnesium hydroxide and magnesium oxide were not added.

[0246] Comparative Example 4

[0247] The sheath material was prepared according to the method of Example 1, except that calcium oxide was not added.

[0248] Cables were prepared using the sheath materials of the above examples.

[0249] The sheath materials prepared in the above examples and comparative examples were tested. The test methods included:

[0250] The mechanical property test was carried out in accordance with the standard of GB / T2951.11-2008;

[0251] The air heat aging test was carried out in accordance with the standard of GB / T2951.12-2008, and the test conditions were: 120℃×7 days;

[0252] The ozone resistance test was carried out in accordance with the standard of GB / T2951.21-2008, and the test conditions were: 25±2℃×24h, ozone concentration (0.025%-0.030%).

[0253] The oil immersion test was carried out in accordance with the standard of GB / T2951.21-2008, and the test conditions were: 100±2℃, 24h, IRM902# oil.

[0254] The test results are shown in Table 1 - Table 4.

[0255] Table 1

[0256]

[0257] Table 2

[0258]

[0259] Table 3

[0260]

[0261] Table 4

[0262]

[0263] It can be seen from the above table that:

[0264] (1) Comparing Example 1 with Examples 4 - 5, it can be seen that by appropriately controlling the addition amount of ethylene - propylene rubber, it has excellent ozone resistance and good oil resistance.

[0265] (2) Comparing Example 1 with Example 6, it can be seen that in this application, the ethylene - propylene rubber selected is binary ethylene - propylene rubber. Compared with ternary ethylene - propylene rubber, binary ethylene - propylene rubber has a better synergistic effect with chlorinated polyethylene and di - decyl sebacate, making the sheath material have better aging resistance, and also having good mechanical properties and reducing costs.

[0266] (3) Comparing Example 1 with Example 7, it can be seen that in this application, by modifying part of the ethylene - propylene rubber, it has better mechanical properties.

[0267] (4) Comparing Example 1 with Example 8, it can be seen that in this application, by combining cylinder oil and chlorinated paraffin oil, it has better aging resistance and low - temperature resistance.

[0268] (5) Comparing Example 1 with Example 9, it can be seen that by using magnesium oxide and magnesium hydroxide in combination as the acid absorbent in this application, a better acid absorption and degassing effect can be achieved.

[0269] (6) Comparing Example 1 with Examples 10 - 13, it can be seen that by using octylated diphenylamine, N,N'-dimethylphenyl-p-phenylenediamine, and 4,4'-bis(α,α-dimethylbenzyl) diphenylamine as the anti-aging system in this application, excellent ozone resistance and aging resistance can be obtained.

[0270] (7) Comparing Example 1 with Example 14, it can be seen that by controlling the addition amount of the co-vulcanizing agent in this application, a high degree of vulcanization, excellent mechanical properties, and a dense and pore-free rubber compound can be achieved.

[0271] (8) Comparing Example 1 with Comparative Examples 1 - 4, it can be seen that by blending a part of ethylene-propylene rubber and di-decyl sebacate in chlorinated polyethylene in this application, not only can the plasticizing effect be achieved and the amount of plasticizer be reduced, but also excellent ozone resistance, high-temperature resistance, and low-temperature resistance can be synergistically imparted to the sheath material. In addition, the acid absorbent and the moisture absorbent can absorb the small molecule hydrogen chloride and water generated during the mixing process of chlorinated polyethylene, thereby avoiding the formation of pores in the sheath material and effectively ensuring the mechanical properties of the sheath material. The sheath material of this application has an elongation at break of more than 170% under the low-temperature test condition of -40°C; after aging treatment in an environment of 120°C for 7 days, the performance remains good.

[0272] 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 described in this specification.

[0273] The above-described embodiments only represent several implementation manners of this application. The description 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 this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. A sheath material, characterized in that: The raw materials for preparing the sheath material include, by weight: Among them, the plasticizer includes cylinder oil and chlorinated paraffin oil. In terms of weight percentage, the preparation raw materials include: cylinder oil, 4 parts to 8 parts; and chlorinated paraffin oil, 15 parts to 25 parts; the acid absorber includes magnesium hydroxide and magnesium oxide; the auxiliary agent includes a stabilizer, an antioxidant, a vulcanizer and a vulcanizing agent, and the stabilizer includes lead oleate; the antioxidant includes octylated diphenylamine, N,N'-xylyl p-phenylenediamine and 4,4'-bis(α,α-dimethylbenzyl) diphenylamine; the vulcanizer includes 2,4-di-tert-butyl peroxide isopropylbenzene; the vulcanizing agent includes trimethylolpropane trimethacrylate.

2. The sheath material according to claim 1, characterized in that The EPDM rubber satisfies at least one of the following conditions: (1) The EPDM rubber includes at least one of EPDM dipolymer, modified EPDM dipolymer and EPDM terpolymer; (2) The mass proportion of ethylene units in the EPDM rubber is 55% to 60%.

3. The sheath material according to claim 2, characterized in that The modified EPDM rubber includes methacrylate-glycidyl methacrylate grafted modified EPDM rubber.

4. The sheath material according to claim 1, characterized in that The sheath material satisfies at least one of the following conditions: (1) The filler includes at least one of white carbon black and carbon black; (2) The moisture absorbent includes calcium oxide.

5. The sheath material according to any one of claims 1 to 4, characterized in that: The auxiliary agent also includes at least one of a flame retardant, a coupling agent, and a lubricant.

6. The sheath material according to claim 5, characterized in that The auxiliary agents include flame retardants, stabilizers, coupling agents, antioxidants, vulcanizers, co-vulcanizers and lubricants. The raw materials for preparing the sheath material include, by weight:

7. The sheath material according to claim 1, characterized in that The mass ratio of the octylated diphenylamine, N,N'-xylyl-p-phenylenediamine and 4,4'-bis(α,α-dimethylbenzyl)diphenylamine is (0.8-1.2):(0.8-1.2):(0.8-1.2).

8. The sheath material according to claim 5, characterized in that The auxiliary agent satisfies at least one of the following conditions: (1) The flame retardant includes antimony trioxide; (2) The coupling agent includes vinyl tris(β-methoxyethoxy)silane; (3) The lubricant includes microcrystalline wax.

9. A method for preparing the sheath material according to any one of claims 1 to 8, characterized in that: The preparation method comprises: The chlorinated polyethylene, the ethylene-propylene rubber, the didecyl sebacate, the filler, the plasticizer, the acid absorbent, the moisture absorbent and the auxiliary agent are mixed to prepare the sheath material.

10. Use of the sheath material according to any one of claims 1 to 8 in the preparation of power transmission products.

11. A cable, characterized in that: The cable comprises the sheath material according to any one of claims 1-8.

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