Sheath material, preparation method and application thereof and cable

Abstract

The invention relates to the technical field of cables, and provides a sheath material, a preparation method and application thereof and a cable, and the sheath material is prepared from the following raw materials: chlorinated polyethylene, organosilicon modified alkyd resin, a sulfate salt fog resistant agent and an auxiliary agent. Wherein the organic silicon modified alkyd resin contains an organic silicon group and an alkyd resin group, the mass percentage content of the organic silicon group contained in the organic silicon modified alkyd resin is 15%-30%, and the number-average molecular weight of the organic silicon group is 1300-1400. The sheath material provided by the invention has excellent salt fog resistance and mechanical properties.

Description

Technical Field

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

[0002] The oceans offer abundant wind energy resources, making them a viable option for generating wind power. However, offshore operating conditions are complex, particularly in deep waters, where salt spray concentrations are high and fungal flora are complex. Therefore, during offshore wind turbine operation, the sheath of traditional cables struggles to withstand the torsion resistance requirements of high salt spray concentrations. Summary of the Invention

[0003] Based on this, an embodiment of the present application provides a torsion-resistant and salt spray-resistant sheath material, a preparation method thereof, an application thereof, and a cable.

[0004] In the first aspect, the present application provides a sheath material, the raw materials for preparing the sheath material include chlorinated polyethylene, silicone-modified alkyd resin, sulfate salt spray resistant agent and additives, the silicone-modified alkyd resin contains silicone groups and alkyd resin groups, the mass percentage of the silicone groups in the silicone-modified alkyd resin is 15%~30%, and the number average molecular weight of the silicone groups is 1300~1400.

[0005] In some embodiments, the organosilicon group includes at least one of a phenyl silicone rubber group, a benzyl silicone rubber group, and a methyl silicone rubber group.

[0006] In some embodiments, the number average molecular weight of the alkyd resin group is 1400-1500.

[0007] In some embodiments, the mass percentage of chlorine element contained in the chlorinated polyethylene is 35% to 40%.

[0008] In some embodiments, the sulfate salt spray resisting agent includes at least one of barium sulfate, magnesium sulfate, and barium sulfite.

[0009] In some embodiments, the raw materials for preparing the sheath material include, by weight: 70 to 90 parts of chlorinated polyethylene; 10 to 15 parts of organosilicon-modified alkyd resin; and 2 to 4 parts of sulfate salt spray resistant agent.

[0010] In some embodiments, the auxiliary agent includes at least one of a plasticizer, an antioxidant, a cross-linking agent, a co-cross-linking agent, a coupling agent, a reinforcing agent, a filler, a flame retardant, a lubricant, and a color powder.

[0011] In some embodiments, the adjuvant satisfies at least one of the following conditions:

[0012] (1) The plasticizer includes at least one of dioctyl sebacate, dioctyl adipate and dioctyl phthalate;

[0013] (2) The antioxidant includes at least one of antioxidant RD and antioxidant MB;

[0014] (3) the cross-linking agent comprises at least one of dicumyl peroxide and 2,4-di-tert-butylcumyl peroxide;

[0015] (4) the auxiliary cross-linking agent includes at least one of triallyl cyanurate and triallyl isocyanurate;

[0016] (5) the coupling agent comprises at least one of bis(γ-triethoxysilylpropyl)tetrasulfide and vinyltri(β-methoxyethoxy)silane;

[0017] (6) The reinforcing agent includes at least one of white carbon black and carbon black;

[0018] (7) Fillers include at least one of kaolin, calcium carbonate and talc

[0019] (8) The flame retardant includes at least one of magnesium hydroxide, aluminum hydroxide and a composite flame retardant;

[0020] (9) The lubricant includes at least one of semi-refined paraffin wax, refined paraffin wax and polyethylene wax.

[0021] In some embodiments, the auxiliary agent further satisfies at least one of the following conditions, calculated by weight:

[0022] (1) The raw materials for the preparation of the sheath material include 3 to 5 parts of plasticizer;

[0023] (2) The raw materials for the preparation of the sheath material include 2 to 4 parts of antioxidant;

[0024] (3) The raw materials for preparing the sheath material include a cross-linking agent, 2 to 4 parts.

[0025] (4) The raw materials for the preparation of the sheath material include a cross-linking agent, 2 to 4 parts;

[0026] (5) The raw materials for the preparation of the sheath material include a coupling agent, 0.5 to 1 part;

[0027] (6) The raw materials for the preparation of the sheath material include a reinforcing agent, 12 to 16 parts;

[0028] (7) The raw materials for the preparation of the sheath material include filler, 30 to 40 parts;

[0029] (8) The raw materials for the preparation of the sheath material include flame retardant, 15 to 25 parts;

[0030] (9) The raw materials for the preparation of the sheath material include lubricant, 3 to 6 parts;

[0031] (10) The raw materials for preparing the sheath material include color powder, 1 part to 2 parts.

[0032] In a second aspect, the present application further provides a method for preparing the sheath material according to the first aspect, the preparation method comprising:

[0033] Chlorinated polyethylene, organosilicon-modified alkyd resin, sulfate salt spray resistant agent and additives are mixed to prepare a sheath material;

[0034] The organosilicon-modified alkyd resin contains an organosilicon group and an alkyd resin group. The mass percentage of the organosilicon group in the organosilicon-modified alkyd resin is 15% to 30%, and the number average molecular weight of the organosilicon group is 1300 to 1400.

[0035] In a third aspect, the present application provides an application of the sheath material according to the first aspect in the preparation of power transmission products.

[0036] In a fourth aspect, the present application provides a cable, comprising the sheath material according to the first aspect.

[0037] Compared with traditional technologies, this application has at least the following beneficial effects:

[0038] This application uses chlorinated polyethylene as the base material and synergistically combines organosilicon-modified alkyd resin, sulfate salt spray resistant agent and additives. First, the addition of organosilicon-modified alkyd resin effectively improves the compatibility of chlorinated polyethylene and sulfate salt spray resistant agent, improves the processing performance of the raw materials, and improves the dispersion uniformity of sulfate salt spray resistant agent in the sheath material, giving full play to the performance of sulfate salt spray resistant agent. Secondly, the alkyd resin group and organosilicon group in the organosilicon-modified alkyd resin can both cross-link with chlorinated polyethylene, and by controlling the content and molecular weight of the organosilicon group, the cross-linked network structure of the sheath material is synergistically enhanced, the density of the sheath material is improved, and the pores and defects inside the material are reduced, effectively improving the mechanical properties and torsion resistance of the sheath material. Furthermore, the organosilicon group can also inhibit the hydrolysis reaction of the hydrolyzable group in the sheath material, thereby further improving the salt spray resistance of the sheath material and effectively avoiding cracking and pulverization of the sheath material under harsh external environments. Therefore, the sheath material of this application has good mechanical properties, torsion resistance and salt spray resistance. DETAILED DESCRIPTION

[0039] Below in conjunction with embodiment and example, the application is further described in detail These embodiment and example are only used to illustrate the application and are not used to limit the scope of the application, and the purpose of providing these embodiment and example is to make the understanding of the disclosure of the application more thorough and comprehensive. It should also be understood that the application can be implemented in many different forms and is not limited to the embodiment and example described herein. Those skilled in the art can make various changes or modifications without violating the connotation of the application, and the equivalent form obtained also falls within the protection scope of the application. In addition, in the description below, a large amount of specific details are given in order to provide a more complete understanding of the application, and it should be understood that the application can be implemented without one or more of these details.

[0040] 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 pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0041] In this application, the terms "optionally," "optional," and "optional" mean optional or dispensable, i.e., they refer to either option being selected from two parallel options: "with" or "without." If a technical solution contains multiple "optional" clauses, each "optional" clause is independent unless otherwise specified and there are no contradictions or constraints.

[0042] In this application, the terms "first" and "second" in "the first aspect" and "the second aspect" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or quantity, nor should they be understood as implicitly indicating the importance or quantity of the technical features indicated. Furthermore, "first" and "second" serve only as non-exhaustive enumeration and description and should be understood not to constitute a closed-ended limitation on quantity.

[0043] In this application, 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.

[0044] In this application, when referring to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values within the numerical interval is deemed to be continuous and includes the two numerical endpoints of the numerical interval (i.e., the minimum and maximum values), as well as each numerical value between the two numerical endpoints. Unless otherwise specified, when a numerical interval refers only to 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 a feature or characteristic, 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 subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. "Numerical interval" is broadly allowed to include quantitative intervals such as percentage intervals, ratio intervals, and ratio intervals.

[0045] All documents mentioned in this application are cited as references in this application, just as each document is cited as reference separately. Unless they conflict with the application purpose and / or technical solution of this application, the cited documents involved in this application are cited in their entirety and for all purposes. When cited documents are involved in this application, the definitions of relevant technical features, terms, nouns, phrases, etc. in the cited documents are also cited. When cited documents are involved in this application, the examples and preferred embodiments of the cited relevant technical features may also be incorporated into this application as references, but are limited to the ability to implement this application. It should be understood that when the cited content conflicts with the description in this application, the present application shall prevail or be adaptively amended according to the description in this application.

[0046] Traditionally, chlorinated polyethylene (CPE) has good torsional properties and can meet the torsional resistance requirements of wind turbines during operation. However, the high humidity and salt spray concentrations in offshore environments can easily corrode the sheath material, causing cracking and powdering, rendering it ineffective and unable to meet the torsional requirements of wind turbine operation.

[0047] Based on this, the first aspect of the present application provides a sheath material, the raw materials for preparing the sheath material include chlorinated polyethylene, silicone-modified alkyd resin, sulfate salt spray resistant agent and additives, the silicone-modified alkyd resin contains silicone groups and alkyd resin groups, the mass percentage of the silicone groups in the silicone-modified alkyd resin is 15%~30%, and the number average molecular weight of the silicone groups is 1300~1400.

[0048] This application uses chlorinated polyethylene as the base material and synergistically combines organosilicon-modified alkyd resin, sulfate salt spray resistant agent and additives. First, the addition of organosilicon-modified alkyd resin effectively improves the compatibility of chlorinated polyethylene and sulfate salt spray resistant agent, improves the processing performance of the raw materials, and improves the dispersion uniformity of sulfate salt spray resistant agent in the sheath material, giving full play to the performance of sulfate salt spray resistant agent. Secondly, the alkyd resin group and organosilicon group in the organosilicon-modified alkyd resin can both cross-link with chlorinated polyethylene, and by controlling the content and molecular weight of the organosilicon group, the cross-linked network structure of the sheath material is synergistically enhanced, the density of the sheath material is improved, and the pores and defects inside the material are reduced, effectively improving the mechanical properties and torsion resistance of the sheath material. Furthermore, the organosilicon group can also inhibit the hydrolysis reaction of the hydrolyzable group in the sheath material, thereby further improving the salt spray resistance of the sheath material and effectively avoiding cracking and pulverization of the sheath material under harsh external environments. Therefore, the sheath material of this application has good mechanical properties, torsion resistance and salt spray resistance.

[0049] Wherein, the mass percentage of the organosilicon groups contained in the organosilicon-modified alkyd resin can be 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29% or 30%. The present application selects the content of the organosilicon groups as above, which can form a suitable organosilicon network in the sheath material, and synergistically improve the mechanical properties and salt spray resistance of the sheath material. If the content of the organosilicon-modified groups is relatively low, it may cause the hydrolyzed groups in the sheath material to undergo hydrolysis reaction, resulting in low salt spray resistance of the sheath material, and easy cracking and powdering in an environment with high salt spray concentration. If the content of the organosilicon-modified groups is relatively high, not only will the salt spray resistance of the sheath material not be improved, but it will also affect the mechanical properties and oil immersion performance of the sheath material.

[0050] Alternatively, the number average molecular weight of the organosilicon group can be 1300, 1310, 1320, 1330, 1340, 1350, 1360, 1370, 1380, 1330 or 1400. By selecting the molecular weight of the organosilicon group as above, a stable cross-linked structure can be formed in the sheath material to prevent salt spray erosion. If the molecular weight of the organosilicon group is relatively low, the cross-linked structure between the organosilicon group and the chlorinated polyethylene may not be improved effectively, and a protective film that blocks salt spray cannot be formed in the sheath material, resulting in deterioration of the mechanical properties and salt spray resistance of the sheath material. If the molecular weight of the organosilicon modified group is relatively high, although a stable salt spray resistant protective structure can be formed, the brittle cross-linked network structure of the chlorinated polyethylene is poorly improved, affecting the mechanical properties of the sheath material, and thus it is difficult to effectively maintain the salt spray resistance during the torsion process.

[0051] It is understood that alkyd resin refers to a polymer obtained by condensing and esterifying a polyfunctional alcohol, a polybasic acid, and a vegetable oil or vegetable oil acid. The polybasic acid may be, for example, terephthalic acid; the polyhydric alcohol may be, for example, ethylene glycol. For example, an alkyd resin may be a polymer prepared from fatty acids and triglyceride oils.

[0052] Optionally, the alkyd resin includes a short-oil non-drying alkyd resin. Short oil refers to an alkyd resin with an oil content of 30% to 40%, and oil content refers to the mass percentage of oil or fatty acids in the alkyd resin. Non-drying refers to the inability to dry out in an air environment, thereby having better processing performance. Furthermore, the organosilicon-modified alkyd resin of the present application refers to an alkyd resin modified with an organosilicon group. The modification method can be to graft an organosilicon group onto the alkyd resin, or to form an organosilicon group by co-condensation with the alkyd resin.

[0053] It should be noted that the organosilicon-modified alkyd resin of this application can be prepared using either commercially available products or existing methods. For example, it can be formed by co-condensation of an organosilicon resin and an alkyd resin. The preparation method generally employs the transesterification method, a chemical modification method, in which the ester groups in the alkyd resin undergo an ester exchange reaction with the hydroxyl or alkoxy groups in the organosilicon resin in the presence of a catalyst to produce the organosilicon-modified alkyd resin. Optionally, the catalyst can be a zinc oxide catalyst; the transesterification reaction temperature is 180°C to 220°C, and the reaction time is 4 to 6 hours.

[0054] In some embodiments, the organic silicon group includes at least one of a phenyl silicone rubber group, a benzyl silicone rubber group, and a methyl silicone rubber group.

[0055] The present application selects the organosilicon group as described above, so that the organosilicon-modified alkyd resin contains not only saturated bonds but also a large number of Si-O-Si bonds, which can enhance the synergistic effect of the organosilicon-modified alkyd resin and chlorinated polyethylene, thereby improving the processing performance and salt spray resistance of the sheath material.

[0056] In some embodiments, the number average molecular weight of the alkyd resin group is 1400-1500, for example, 1400, 1410, 1420, 1430, 1440, 1450, 1460, 1470, 1480, 1490, or 1500.

[0057] As described above, the present application selects the molecular weights of the silicone group and the alkyd resin group in the silicone-modified alkyd resin so that the molecular weights of the silicone group and the alkyd resin group are equivalent, effectively enhancing the cross-linking structure in the sheath material and synergistically improving the salt spray resistance and mechanical properties of the sheath material.

[0058] In some embodiments, the mass percentage of chlorine element contained in the chlorinated polyethylene is 35% to 40%, for example, it can be 35%, 36%, 37%, 38%, 39% or 40%.

[0059] As described above, chlorinated polyethylene is selected in this application to synergize with silicone-modified alkyd resin to improve the flexibility of the molecular chains in the sheath material, enhance the material's compactness, and simultaneously enhance the material's mechanical properties, salt spray resistance, and oil immersion resistance. A relatively low chlorine content may result in poor compactness of the sheath material, making it susceptible to salt spray erosion and deteriorating material properties. A relatively high chlorine content may lead to increased brittleness of the sheath material and poor torsional mechanical properties.

[0060] In some embodiments, the sulfate salt spray resistant agent includes at least one of barium sulfate, magnesium sulfate, and barium sulfite. Alternatively, the sulfate salt spray resistant agent includes barium sulfate.

[0061] This application utilizes a sulfate-based salt spray resistant agent, which, under the action of a silicone-modified alkyd resin, can be evenly dispersed into the sheath material, forming a stable physical shielding structure within the sheath material, effectively improving the sheath material's weather resistance and insulation properties. Furthermore, barium sulfate can be used as a contrast agent, enabling direct testing with a deflectometer during cable production, enabling in-process inspection.

[0062] In some embodiments, the raw materials for preparing the sheath material include, by weight: 70 to 90 parts of chlorinated polyethylene, for example, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, or 90 parts; 10 to 15 parts of organosilicon-modified alkyd resin, for example, 10, 11, 12, 13, 14, or 15 parts; and 2 to 4 parts of sulfate salt spray resistant agent, for example, 2.0, 2.5, 3.0, 3.5, or 4.0 parts.

[0063] The present application selects the ratio of raw materials for preparing the sheath material as above, which effectively improves the processing performance of the raw materials, ensures that the sulfate salt spray resistant agent is evenly dispersed in the sheath material, and gives full play to the salt spray resistance performance; and the sheath material contains an appropriate amount of Si-O-Si bonds, which can enhance the cross-linking structure and synergistically improve the mechanical properties and salt spray resistance of the sheath material. If the amount of silicone-modified alkyd resin added is relatively low, it may cause the raw material processing performance to deteriorate and the cross-linking structure to have poor density, affecting the mechanical properties and salt spray resistance of the material. If the amount of silicone-modified alkyd resin added is relatively high, since the silicone-modified alkyd resin contains more flexible chains, it may cause the mechanical properties of the sheath material to deteriorate.

[0064] It can be understood that the sulfate salt spray resistant agent is an inorganic material, and the addition of silicone modified alkyd resin ensures that the sulfate salt spray resistant agent is evenly dispersed in the raw materials to stably exert the salt spray resistance performance.

[0065] In some embodiments, the auxiliary agent includes at least one of a plasticizer, an antioxidant, a cross-linking agent, a co-cross-linking agent, a coupling agent, a reinforcing agent, a filler, a flame retardant, a lubricant, and a color powder.

[0066] Optionally, the plasticizer includes at least one of dioctyl sebacate, dioctyl adipate, and dioctyl phthalate. The antioxidant includes at least one of antioxidant RD (polytrimethyldihydroquinoline) and antioxidant MB (2-mercaptobenzimidazole). The crosslinker includes at least one of dicumyl peroxide (DCP) and 2,4-di-tert-butylcumyl peroxide (BIBP). The co-crosslinker includes at least one of triallyl cyanurate (TAC) and triallyl isocyanurate (TAIC). The coupling agent includes at least one of bis(γ-triethoxysilylpropyl) tetrasulfide (silane coupling agent KH845) and vinyl tris(β-methoxyethoxy)silane (silane coupling agent A-172). The reinforcing agent includes at least one of white carbon black and carbon black. The filler includes at least one of kaolin, calcium carbonate, and talc. The flame retardant includes at least one of magnesium hydroxide and aluminum hydroxide. It is understood that the flame retardant of the present application can also be used in combination with other flame retardants, for example, a mixed flame retardant obtained by mixing magnesium hydroxide, aluminum hydroxide and magnesium oxide. The lubricant includes at least one of semi-refined paraffin wax, refined paraffin wax and polyethylene wax.

[0067] The raw materials for preparing the sheath material include, by weight, 3 to 5 parts of the plasticizer, for example, 3.0, 3.5, 4.0, 4.5, or 5.0 parts; 2 to 4 parts of the antioxidant, for example, 2.0, 2.5, 3.0, 3.5, or 4.0 parts; 2 to 4 parts of the crosslinking agent, for example, 2.0, 2.5, 3.0, 3.5, or 4.0 parts; 2 to 4 parts of the co-crosslinking agent, for example, 2.0, 2.5, 3.0, 3.5, or 4.0 parts; and 0.5 to 1 part of the coupling agent, for example, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.0 parts. The reinforcing agent may be present in an amount of 12 to 16 parts, for example, 12.0, 12.5, 13.0, 13.5, 14.0, 14.5, 15.0, 15.5, or 16.0 parts. The filler may be present in an amount of 30 to 40 parts, for example, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, or 40 parts. The flame retardant may be present in an amount of 15 to 25 parts, for example, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 parts. The lubricant may be present in an amount of 3 to 6 parts, for example, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, or 6.0 parts. The color powder is 1 to 2 parts, for example, 1.0 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts or 2.0 parts.

[0068] In some embodiments, the raw materials for preparing the sheath material include, by weight:

[0069] Chlorinated polyethylene 70-90 parts;

[0070] 10-15 parts of silicone-modified alkyd resin;

[0071] 2 to 4 parts of sulfate salt spray resistant agent;

[0072] 3~5 parts of plasticizer;

[0073] 2~4 parts of antioxidant;

[0074] 2~4 parts of cross-linking agent;

[0075] 15 to 25 parts of flame retardant;

[0076] 12~16 parts of reinforcing agent;

[0077] 30~40 parts of filler;

[0078] 3 to 6 parts of lubricant;

[0079] 0.5~1 part of coupling agent;

[0080] 2 to 4 parts of a co-crosslinking agent; and

[0081] 1~2 parts of color powder.

[0082] The second aspect of the present application further provides a method for preparing the sheath material according to the first aspect, the method comprising:

[0083] The chlorinated polyethylene, the organosilicon-modified alkyd resin, the sulfate salt spray resistant agent and the auxiliary agent are mixed to prepare the sheath material;

[0084] The organosilicon-modified alkyd resin contains an organosilicon group and an alkyd resin group. The mass percentage of the organosilicon group in the organosilicon-modified alkyd resin is 15% to 30%, and the number average molecular weight of the organosilicon group is 1300 to 1400.

[0085] Exemplarily, a method for preparing the above-mentioned sheath material is provided, comprising the following steps:

[0086] Weigh the raw materials for preparing the sheath material according to the mass fraction;

[0087] The chlorinated polyethylene is mixed for 2 minutes to 4 minutes, and then the silicone modified alkyd resin, antioxidant and lubricant are added and mixed for 2 minutes to 3 minutes, and then the coupling agent, filler, reinforcing agent, sulfate salt spray agent and plasticizer are added and mixed for 6 minutes to 8 minutes. When the mixing temperature reaches 110°C to 120°C, the material is discharged, thinned 1 to 2 times, and then calendered to obtain a mixed rubber material;

[0088] The mixed rubber material is mixed with a cross-linking agent, an auxiliary cross-linking agent and a color powder, kneaded at 120° C. to 125° C. for 0.5 min to 1 min, thinned once to twice, and then calendered to obtain the sheath material.

[0089] A third aspect of the present application provides a use of the sheath material as described in the first aspect in the preparation of power transmission products.

[0090] A fourth aspect of the present application provides a cable, comprising the sheath material as described in the first aspect.

[0091] In some embodiments, the cable includes a plurality of cores and a sheath layer, wherein the sheath layer covers the plurality of cores, and a material of the sheath layer includes the sheath material.

[0092] The embodiments of the present application will be described in detail below with reference to the examples. It should be understood that these examples are intended to illustrate the present application only and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are preferably referred to the guidance provided in the present application, and can also be based on the experimental manuals or conventional conditions in this area, or according to the conditions recommended by the manufacturer, or with reference to experimental methods known in the art.

[0093] In the following examples, the phenyl silicone rubber-modified alkyd resin was purchased from Shandong Baoerya Chemical Co., Ltd., with the designation H-1. The number-average molecular weight of the phenyl silicone rubber group was 1300-1400, and the number-average molecular weight of the alkyd resin was 1400-1500. Chlorinated polyethylene was purchased from Shandong Riko Rubber & Plastic Technology Co., Ltd., with the designation 3550.

[0094] Example 1

[0095] S1. Weigh the raw materials according to mass, including:

[0096] 80 parts of chlorinated polyethylene;

[0097] 15 parts of silicone modified alkyd resin;

[0098] 3 parts of sulfate salt spray resistant agent;

[0099] 4 parts of plasticizer;

[0100] 3 parts of antioxidant;

[0101] 3 parts of cross-linking agent;

[0102] 20 parts of flame retardant;

[0103] 13 parts of reinforcing agent;

[0104] 35 parts of filler;

[0105] 5 parts of lubricant;

[0106] 1 part of coupling agent;

[0107] 3 parts of a co-crosslinking agent; and

[0108] 1 part color powder.

[0109] Among them, the mass percentage of chlorine in chlorinated polyethylene is 35%; the silicone-modified alkyd resin is a phenyl rubber-modified alkyd resin, and the mass percentage of phenyl rubber groups in the silicone-modified alkyd resin is 20%; the sulfate salt spray resistant agent is barium sulfate; the plasticizer is DOS; the antioxidant is antioxidant RD; the cross-linking agent is DCP, and the auxiliary cross-linking agent is TAIC; the flame retardant is magnesium hydroxide; the reinforcing agent is white carbon black; the filler is kaolin; the lubricant is semi-refined paraffin wax; and the coupling agent is silane coupling agent A-172.

[0110] S2, the above-mentioned chlorinated polyethylene was mixed for 3 min, and then the organosilicon-modified alkyd resin, antioxidant and lubricant were added and mixed for 3 min, and then the coupling agent, filler, reinforcing agent, sulfate salt spray agent and plasticizer were added and mixed for 7 min. When the mixing temperature reached 110 ° C, the material was discharged, thinned 1 to 2 times, and then calendered to obtain a mixed rubber material;

[0111] S3. Mix the mixed rubber, cross-linking agent, auxiliary cross-linking agent and color powder, knead at 120° C. for 1 minute, thin-pass 1 to 2 times, and then calender to obtain the sheath material.

[0112] Example 2

[0113] The sheath material is prepared according to the method of Example 1, except that the raw materials in step S1 include:

[0114] 70 parts of chlorinated polyethylene;

[0115] 12 parts of silicone modified alkyd resin;

[0116] 2 parts of sulfate salt spray resistant agent;

[0117] 5 parts of plasticizer;

[0118] 2 parts of antioxidant;

[0119] 2 parts of cross-linking agent;

[0120] 15 parts of flame retardant;

[0121] 16 parts of reinforcing agent;

[0122] 30 parts of filler;

[0123] 3 parts lubricant;

[0124] 0.8 parts of coupling agent;

[0125] 2 parts of auxiliary cross-linking agent; and

[0126] 1 part color powder.

[0127] The mass percentage of chlorine in the chlorinated polyethylene is 37%; the mass percentage of phenyl rubber groups in the silicone-modified alkyd resin is 30%.

[0128] Example 3

[0129] The sheath material is prepared according to the method of Example 1, except that the raw materials in step S1 include:

[0130] 90 parts of chlorinated polyethylene;

[0131] 10 parts of silicone modified alkyd resin;

[0132] 4 parts of sulfate salt spray resistant agent;

[0133] 3 parts of plasticizer;

[0134] 4 parts of antioxidant;

[0135] 4 parts of cross-linking agent;

[0136] 25 parts of flame retardant;

[0137] 12 parts of reinforcing agent;

[0138] 40 parts of filler;

[0139] 6 parts of lubricant;

[0140] 0.5 parts of coupling agent;

[0141] 4 parts of a co-crosslinking agent; and

[0142] 1 part color powder.

[0143] The mass percentage of chlorine in the chlorinated polyethylene is 40%; the mass percentage of phenyl rubber groups in the silicone-modified alkyd resin is 15%.

[0144] Example 4

[0145] The sheath material was prepared according to the method of Example 1, except that the mass percentage of chlorine in the chlorinated polyethylene was 30%.

[0146] Example 5

[0147] The sheath material was prepared according to the method of Example 1, except that the mass percentage of chlorine in the chlorinated polyethylene was 45%.

[0148] Example 6

[0149] The sheath material was prepared according to the method of Example 1, except that the mass fraction of the organosilicon-modified alkyd resin was 20 parts.

[0150] Comparative Example 1

[0151] The sheath material was prepared according to the method of Example 1, except that the organosilicon-modified alkyd resin was replaced with an alkyd resin of equal mass.

[0152] Comparative Example 2

[0153] The sheath material was prepared according to the method of Example 1, except that the organosilicon-modified alkyd resin was not added.

[0154] Comparative Example 3

[0155] The sheath material was prepared according to the method of Example 1, except that the organosilicon-modified alkyd resin was replaced by 5 parts of phenyl silicone rubber and 10 parts of alkyd resin.

[0156] Comparative Example 4

[0157] The sheath material was prepared according to the method of Example 1, except that the mass percentage of the phenyl rubber group in the organosilicon-modified alkyd resin was 10%.

[0158] Comparative Example 5

[0159] The sheath material was prepared according to the method of Example 1, except that the mass percentage of the phenyl rubber group in the organosilicon-modified alkyd resin was 40%.

[0160] Comparative Example 6

[0161] The sheath material was prepared according to the method of Example 1, except that the organosilicon-modified alkyd resin was replaced by an organosilicon-modified alkyd resin with the brand MM1 purchased from Changzhou Jianuo Organosilicon Co., Ltd., whose organosilicon group had a number average molecular weight of 600-650.

[0162] Comparative Example 7

[0163] The sheath material was prepared according to the method of Example 1, except that the organosilicon-modified alkyd resin was replaced by an organosilicon-modified alkyd resin with the brand NM5 purchased from Changzhou Jianuo Organosilicon Co., Ltd., whose organosilicon group had a number average molecular weight of 2600-2800.

[0164] Comparative Example 8

[0165] The sheath material was prepared according to the method of Example 1, except that barium sulfate was not added.

[0166] Comparative Example 9

[0167] The sheath material was prepared according to the method of Example 1, except that barium sulfate was replaced with wollastonite of equal mass.

[0168] The sheath materials prepared in the above embodiments and comparative examples were pressed at 175° C. and 15 MPa for 15 minutes to obtain test samples. The test samples in the above embodiments and comparative examples were subjected to performance tests, including:

[0169] Mechanical properties test is carried out in accordance with GB / T2951.11-2008 standard;

[0170] Air heat aging test is carried out in accordance with GB / T2951.12-2008 standard, test conditions: 158℃×7 days;

[0171] The oxygen index is measured in accordance with GB5454-85 standard;

[0172] The salt spray resistance test is carried out in accordance with GB / T 2423.17-2008. The test conditions are: 35±2℃×3000h, salt spray concentration (5-6%);

[0173] The thermal extension test was carried out in accordance with GB / T2951.21-2008 standard. The test conditions were: 200±3℃×15min, mechanical stress 0.20N / mm 2 ;

[0174] The oil immersion test was carried out in accordance with GB / T2951.11-2008 standard, and the test conditions were: 100°C oil temperature, 24h.

[0175] The test results are shown in Tables 1 and 2.

[0176] Table 1

[0177]

[0178]

[0179] Table 2

[0180]

[0181]

[0182] From the table above we can see that:

[0183] (1) Comparing Example 1 with Examples 4-5, it can be seen that the present application controls the chlorine content in chlorinated polyethylene, which can simultaneously improve the mechanical properties, salt spray resistance and oil immersion performance of the sheath material.

[0184] (2) Comparing Example 1 with Example 6, it can be seen that the present application controls the content of the organosilicon-modified alkyd resin, which can improve the salt spray resistance and oil immersion performance.

[0185] (3) Comparison of Example 1 with Comparative Examples 1-3 shows that the silicone-modified alkyd resin used in this application can effectively improve the cross-linking network, thereby effectively improving the salt spray resistance and mechanical properties.

[0186] (4) Comparison of Example 1 with Comparative Examples 4-5 shows that the present application controls the content of the organosilicon group in the organosilicon-modified alkyd resin, which can effectively improve the salt spray resistance and mechanical properties of the material.

[0187] (5) Comparison of Example 1 with Comparative Examples 6-7 shows that the present invention can significantly improve the salt spray resistance by controlling the molecular weight of the organosilicon group in the organosilicon-modified alkyd resin.

[0188] (6) Comparing Example 1 with Comparative Examples 8-9, it can be seen that the sulfate salt spray resistant agent used in this application can effectively improve the salt spray resistance performance.

[0189] In summary, the present application uses chlorinated polyethylene as the base material and synergistically cooperates with organosilicon-modified alkyd resin, sulfate salt spray resistant agent and additives. First, the addition of organosilicon-modified alkyd resin effectively improves the compatibility of chlorinated polyethylene and sulfate salt spray resistant agent, improves the processing performance of the raw materials, and improves the dispersion uniformity of sulfate salt spray resistant agent in the sheath material, giving full play to the performance of sulfate salt spray resistant agent. Secondly, the alkyd resin group and organosilicon group in the organosilicon-modified alkyd resin can both cross-link with chlorinated polyethylene, and by controlling the content and molecular weight of the organosilicon group, the cross-linked network structure of the sheath material is synergistically enhanced, the density of the sheath material is improved, and the pores and defects inside the material are reduced, effectively improving the mechanical properties and torsion resistance of the sheath material. Furthermore, the organosilicon group can also inhibit the hydrolysis reaction of the hydrolyzable group in the sheath material, thereby further improving the salt spray resistance of the sheath material and effectively avoiding the cracking and pulverization of the sheath material under harsh external environments. Therefore, the sheath material of the present application has good mechanical properties, torsion resistance and salt spray resistance.

[0190] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0191] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and such modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A sheath material, characterized in that: The raw materials for preparing the sheath material include chlorinated polyethylene, organosilicon-modified alkyd resin, sulfate salt spray resistant agent and additives. The organosilicon-modified alkyd resin contains organosilicon groups and alkyd resin groups. The mass percentage of the organosilicon groups in the organosilicon-modified alkyd resin is 15% to 30%, and the number average molecular weight of the organosilicon groups is 1300 to 1400.

2. The sheath material according to claim 1, wherein The organic silicon group includes at least one of a phenyl silicone rubber group, a benzyl silicone rubber group and a methyl silicone rubber group.

3. The sheath material according to claim 1, wherein The number average molecular weight of the alkyd resin group is 1400-1500.

4. The sheath material according to claim 1, wherein The mass percentage of chlorine element contained in the chlorinated polyethylene is 35% to 40%.

5. The sheath material according to claim 1, wherein The sulfate salt spray resistant agent includes at least one of barium sulfate, magnesium sulfate and barium sulfite.

6. The sheath material according to claim 1, wherein Calculated by weight, the raw materials for preparing the sheath material include: 70 to 90 parts of chlorinated polyethylene; 10 to 15 parts of organosilicon-modified alkyd resin; and 2 to 4 parts of sulfate salt spray resistant agent.

7. The sheath material according to any one of claims 1 to 6, characterized in that: The auxiliary agent includes at least one of a plasticizer, an antioxidant, a cross-linking agent, a co-cross-linking agent, a coupling agent, a reinforcing agent, a filler, a flame retardant, a lubricant and a color powder.

8. The sheath material according to claim 7, wherein: The auxiliary agent satisfies at least one of the following conditions: (1) The plasticizer includes at least one of dioctyl sebacate, dioctyl adipate and dioctyl phthalate; (2) The antioxidant includes at least one of antioxidant RD and antioxidant MB; (3) The cross-linking agent includes at least one of dicumyl peroxide and 2,4-di-tert-butylcumyl peroxide; (4) The auxiliary cross-linking agent includes at least one of triallyl cyanurate and triallyl isocyanurate; (5) The coupling agent includes at least one of bis(γ-triethoxysilylpropyl)tetrasulfide and vinyltri(β-methoxyethoxy)silane; (6) The reinforcing agent includes at least one of white carbon black and carbon black; (7) The filler includes at least one of kaolin, calcium carbonate and talc (8) The flame retardant includes at least one of magnesium hydroxide and aluminum hydroxide; (9) The lubricant includes at least one of semi-refined paraffin wax, refined paraffin wax and polyethylene wax.

9. The sheath material according to claim 7, wherein: In parts by mass, the auxiliary agent also meets at least one of the following conditions: (1) The raw materials for preparing the sheath material include 3 to 5 parts of the plasticizer; (2) The raw materials for preparing the sheath material include 2 to 4 parts of the antioxidant; (3) The raw materials for preparing the sheath material include 2 to 4 parts of the cross-linking agent; (4) The raw materials for preparing the sheath material include 2 to 4 parts of the auxiliary cross-linking agent; (5) The raw materials for preparing the sheath material include the coupling agent, 0.5 part to 1 part; (6) The raw materials for preparing the sheath material include 12 to 16 parts of the reinforcing agent; (7) The raw materials for preparing the sheath material include 30 to 40 parts of the filler; (8) The raw materials for preparing the sheath material include 15 to 25 parts of the flame retardant; (9) The raw materials for preparing the sheath material include 3 to 6 parts of the lubricant; (10) The raw materials for preparing the sheath material include 1 to 2 parts of the color powder.

10. A method for preparing the sheath material according to any one of claims 1 to 9, characterized in that: The preparation method comprises: The chlorinated polyethylene, the organosilicon-modified alkyd resin, the sulfate salt spray resistant agent and the auxiliary agent are mixed to prepare the sheath material; The organosilicon-modified alkyd resin contains an organosilicon group and an alkyd resin group. The mass percentage of the organosilicon group in the organosilicon-modified alkyd resin is 15% to 30%, and the number average molecular weight of the organosilicon group is 1300 to 1400.

11. Use of the sheath material according to any one of claims 1 to 9 in the preparation of power transmission products.

12. A cable, characterized in that: The cable comprises the sheath material according to any one of claims 1 to 9.

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