Cold-resistant sheath material for cable and preparation method thereof

Abstract

The invention relates to the technical field of rubber materials, and specifically discloses a cold-resistant sheath material for cables and a preparation method thereof. The preparation method comprises the following steps: S1: adding chloroprene rubber to a mixed solvent, fully stirring and dissolving, adding 1,3,5-tri(4-vinylphenyl)benzene, acrylic acid and methyl methacrylate, stirring for 0.5-1h, adding an initiator, heating to 70 DEG C, stirring and reacting for 5-6h, adding an inhibitor and an antioxidant, stirring and mixing, removing the solvent, and obtaining modified chloroprene rubber; S2: adding chloroprene rubber, modified chloroprene rubber, stearic acid, protective wax and an antioxidant into an internal mixer, mixing for 50-60 seconds; adding a plasticizer, mixing for 4-5 minutes, adding a plasticizing filler, and discharging the rubber material after the temperature reaches 110 DEG C; moving the rubber material to an open mixer for thinning, and cooling to room temperature to obtain the cold-resistant sheath material for cables.

Description

Technical Field

[0001] The invention relates to the technical field of rubber materials, and specifically discloses a cold-resistant sheath material for cables and a preparation method thereof. Background Art

[0002] Chloroprene rubber is a rubber obtained by polymerizing 2-chloro-1,3-butadiene monomers. Its molecular chains are arranged regularly and its crystallinity is high. Therefore, it has good mechanical properties, weather resistance, and chemical corrosion resistance, and is often used in the preparation of cable sheath materials. However, due to its regularity, the intermolecular forces and crystallinity of chloroprene rubber are large, and its cold resistance is poor, which cannot meet the needs of some high-cold areas. Therefore, it needs to be modified to be cold-resistant.

[0003] Grafting on the side chain of chloroprene rubber can destroy the regularity of its molecular structure, making it difficult to crystallize and increasing its cold resistance. However, the destruction of regularity may lead to the reduction of mechanical properties and other properties. Therefore, it is necessary to study a suitable grafting modification process to balance mechanical properties and cold resistance. In summary, it is of great significance to study a chloroprene rubber cold-resistant sheath material for cables with good cold resistance and good mechanical properties and its preparation method. Summary of the invention

[0004] The object of the present invention is to provide a cold-resistant sheath material for cables and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A method for preparing a cold-resistant sheath material for a cable, comprising the following steps: S1: adding chloroprene rubber to a mixed solvent, stirring and dissolving the mixture, adding 1,3,5-tri(4-vinylphenyl)benzene, acrylic acid, and methyl methacrylate, stirring for 0.5 to 1 hour, adding an initiator, heating the mixture to 70°C, stirring and reacting the mixture for 5 to 6 hours, adding an inhibitor and an antioxidant, stirring and mixing the mixture, and removing the solvent to obtain a modified chloroprene rubber;

[0006] S2: Add chloroprene rubber, modified chloroprene rubber, stearic acid, protective wax and antioxidant into an internal mixer and mix for 50-60 seconds; add plasticizer and mix for 4-5 minutes; add plasticizer filler and mix until the temperature reaches 110°C before discharging the rubber; move the rubber to an open mixer for thin sheeting and cool to room temperature to obtain cold-resistant sheath material for cable.

[0007] More optimally, the cold-resistant sheath material for the cable includes the following raw materials, calculated by mass: 60~70 parts of chloroprene rubber, 35~45 parts of modified chloroprene rubber, 0.5~1 parts of stearic acid, 2~3 parts of protective wax, 4~6 parts of antioxidant, 8~10 parts of plasticizer, and 100~105 parts of plasticizing filler.

[0008] More optimally, the modified chloroprene rubber comprises the following raw materials, calculated by weight: 100 parts of chloroprene rubber, 10 to 12 parts of 1,3,5-tri(4-vinylphenyl)benzene, 5 to 8 parts of acrylic acid, and 18 to 22 parts of methyl methacrylate.

[0009] More optimally, the mixed solvent is xylene and ethanol in a volume ratio of (5-6):1, and the added amount is 7-10 times the mass of the chloroprene rubber; the initiator is potassium persulfate, and the added amount is 0.5-0.8% of the mass of the chloroprene rubber; the added amounts of the inhibitor and antioxidant are 0.4-0.5% of the mass of the chloroprene rubber, respectively.

[0010] More optimally, the mixed solvent is xylene and ethanol in a volume ratio of 5:1, and the added amount is 8 times the mass of the chloroprene rubber; the initiator is potassium persulfate, and the added amount is 0.8% of the mass of the chloroprene rubber; the added amounts of the inhibitor and antioxidant are respectively 0.5% of the mass of the chloroprene rubber.

[0011] More optimally, the preparation of the plasticized filler includes the following steps: taking a composite filler, dispersing it evenly in a mixed solvent of ethanol and water, adding vinyl trimethoxy silane, stirring at 40-60°C for 4-6 hours to obtain a vinylized filler; adding 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester and benzoyl peroxide, stirring evenly, reacting at 78-80°C for 6-8 hours, cooling to 55-60°C, adding glutaraldehyde, 2-octyldecanoic acid glyceride, and thiosemicarbazide, stirring at a temperature of 2-3 hours, and removing the solvent to obtain a plasticized filler.

[0012] More optimally, the composite filler includes carbon black, zinc oxide and magnesium oxide in a mass ratio of 10: (0.6-0.8): (0.5-0.8).

[0013] More optimally, the plasticizing filler includes the following raw materials, calculated by mass: 50 parts of composite filler, 2-4 parts of vinyltrimethoxysilane, 10-12 parts of 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester, 20-25 parts of glutaraldehyde, 20-25 parts of caprylic acid glyceride, and 1-2 parts of thiosemicarbazide.

[0014] More optimally, the mixed solvent of ethanol and water comprises water and anhydrous ethanol in a volume ratio of 1:1, and the added amount of the mixed solvent is 10 to 12 times the mass of the composite filler; the added amount of the benzoyl peroxide is 0.3 to 0.4% of the mass of the vinyl filler.

[0015] More optimally, the mixed solvent of ethanol and water comprises water and anhydrous ethanol in a volume ratio of 1:1, and the added amount of the mixed solvent is 10 times the mass of the composite filler; the added amount of benzoyl peroxide is 0.3% of the mass of the vinyl filler.

[0016] More optimally, the plasticizer is dioctyl sebacate.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are: (1) Preparation of modified chloroprene rubber. Chloroprene rubber has a regular molecular structure and high crystallinity. Although it has good mechanical properties, it is not very cold-resistant. Therefore, it is grafted on its side chain to reduce the regularity and crystallization rate to improve the cold resistance. The present invention uses 1,3,5-tri(4-vinylphenyl)benzene, acrylic acid, and methyl methacrylate for modification. 1,3,5-tri(4-vinylphenyl)benzene contains multiple phenyl groups. The benzene ring can be used as a rotation point to increase the freedom of the molecular chain. However, as a rigid structure, it will also affect the rubber if too much is introduced. The flexibility of 1,3,5-tri(4-vinylphenyl)benzene is high, and contains three vinyl groups. Therefore, the amount of its addition directly determines the branching degree of the chloroprene rubber side chain. Therefore, the amount of addition needs to be controlled. Too little addition will result in little improvement in cold resistance, and too much addition will result in reduced mechanical properties. When chloroprene rubber is subjected to side chain grafting modification, the structural regularity is reduced and the mechanical properties are also affected. Therefore, methyl methacrylate is introduced to improve the mechanical properties. Acrylic acid contains carboxyl groups, which can be complexed with the metal oxides in the plasticizer filler prepared in the subsequent steps to improve the compatibility of the two.

[0018] (2) To prepare a plasticizer filler, carbon black, zinc oxide and magnesium oxide are first mixed in a certain proportion, and then vinyl modified, and then 2-methyl-2-acrylate-2,3-dihydroxypropyl ester is added for polymerization; the introduction of 2-methyl-2-acrylate-2,3-dihydroxypropyl ester can improve the flexibility of the rubber, and has good compatibility with methyl methacrylate in the modified chloroprene rubber, which helps to improve the affinity of the two. At the same time, multiple hydroxyl groups therein are helpful for the next modification; in the next modification, octyl decanoate glyceryl and aminothiourea are introduced. Octyl decanoate glyceryl is a cold-resistant plasticizer. Aminothiourea can work together with zinc oxide and magnesium oxide as a vulcanizer to improve the crosslinking degree of the rubber; therefore, the plasticizer filler has the functions of a plasticizer, a cold-resistant agent and a vulcanizer, and after compounding, it has good compatibility with chloroprene rubber and modified chloroprene rubber, thereby improving the problem of migration and precipitation. DETAILED DESCRIPTION

[0019] The following is a preferred implementation of the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. For ordinary technicians in this technical field, all other embodiments obtained by ordinary technicians in this field without creative work without departing from the principle of the embodiment of the present invention are within the scope of protection of the present invention.

[0020] The following parts are by mass unless otherwise specified;

[0021] Example 1: S1: Take 100 parts of chloroprene rubber, add a mixed solvent of xylene and ethanol, stir and dissolve thoroughly, add 12 parts of 1,3,5-tri(4-vinylphenyl)benzene, 6 parts of acrylic acid, and 20 parts of methyl methacrylate, stir for 1 hour, add initiator potassium persulfate, heat to 70°C, stir and react for 6 hours, add inhibitor and antioxidant, stir and mix thoroughly, remove the solvent, and obtain modified chloroprene rubber;

[0022] S2: Take carbon black, zinc oxide and magnesium oxide in a mass ratio of 10:0.8:0.6, mix them evenly to obtain a composite filler; take 50 parts of the composite filler, add it into a mixed solvent of water and ethanol and disperse it evenly, add 3.5 parts of vinyl silane coupling agent, stir at 50°C for 5 hours to obtain a vinyl filler; add 12 parts of 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester and benzoyl peroxide, stir evenly, react at 80°C for 7 hours, cool to 60°C, add 22 parts of glutaraldehyde, 20 parts of octanoic acid glyceride, and 1.5 parts of thiosemicarbazide, stir evenly, keep warm and stir for 3 hours, remove the solvent, and obtain a plasticized filler;

[0023] S3: Cool the internal mixer with water, add 65 parts of chloroprene rubber, 40 parts of modified chloroprene rubber, 1 part of stearic acid, 3 parts of protective wax, and 5 parts of antioxidant, and mix at 40°C for 60 seconds; add 10 parts of plasticizer, and mix at 40°C for 5 minutes; add 100 parts of plasticizing filler, mix until the temperature reaches 110°C, and then discharge the rubber material; move the rubber material to an open mixer for thin sheeting, and cool to room temperature to obtain a cold-resistant sheath material for cable.

[0024] Example 2: S1: Take 100 parts of chloroprene rubber, add a mixed solvent of xylene and ethanol, stir and dissolve thoroughly, add 12 parts of 1,3,5-tri(4-vinylphenyl)benzene, 8 parts of acrylic acid, and 22 parts of methyl methacrylate, stir for 1 hour, add initiator potassium persulfate, heat to 70°C, stir and react for 6 hours, add inhibitor and antioxidant, stir and mix thoroughly, remove the solvent, and obtain modified chloroprene rubber;

[0025] S2: Take carbon black, zinc oxide and magnesium oxide in a mass ratio of 10:0.8:0.6, mix them evenly to obtain a composite filler; take 50 parts of the composite filler, add it into a mixed solvent of water and ethanol and disperse it evenly, add 4 parts of vinyl silane coupling agent, stir at 50°C for 5 hours to obtain a vinyl filler; add 12 parts of 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester and benzoyl peroxide, stir evenly, react at 80°C for 7 hours, cool to 60°C, add 25 parts of glutaraldehyde, 25 parts of glyceryl caprylate and 2 parts of thiosemicarbazide, stir evenly, keep warm and stir for 3 hours, remove the solvent to obtain a plasticized filler;

[0026] S3: Cool the internal mixer with water, add 60 parts of chloroprene rubber, 35 parts of modified chloroprene rubber, 0.5 parts of stearic acid, 2 parts of protective wax, and 4 parts of antioxidant, and mix at 40°C for 60 seconds; add 8 parts of plasticizer, and mix at 40°C for 4 minutes; add 100 parts of plasticized filler, mix, and discharge the rubber material after the temperature reaches 110°C; move the rubber material to an open mixer for thin sheeting, cool to room temperature, and obtain cold-resistant sheath material for cable.

[0027] Example 3: S1: Take 100 parts of chloroprene rubber, add a mixed solvent of xylene and ethanol, stir and dissolve thoroughly, add 12 parts of 1,3,5-tri(4-vinylphenyl)benzene, 8 parts of acrylic acid, and 22 parts of methyl methacrylate, stir for 1 hour, add initiator potassium persulfate, heat to 70°C, stir and react for 6 hours, add inhibitor and antioxidant, stir and mix thoroughly, remove the solvent, and obtain modified chloroprene rubber;

[0028] S2: Take carbon black, zinc oxide and magnesium oxide in a mass ratio of 10:0.8:0.6, mix them evenly to obtain a composite filler; take 50 parts of the composite filler, add it into a mixed solvent of water and ethanol and disperse it evenly, add 4 parts of vinyl silane coupling agent, stir at 50°C for 5 hours to obtain a vinyl filler; add 12 parts of 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester and benzoyl peroxide, stir evenly, react at 80°C for 7 hours, cool to 60°C, add 25 parts of glutaraldehyde, 25 parts of glyceryl caprylate and 2 parts of thiosemicarbazide, stir evenly, keep warm and stir for 3 hours, remove the solvent to obtain a plasticized filler;

[0029] S3: Cool the internal mixer with water, add 70 parts of chloroprene rubber, 45 parts of modified chloroprene rubber, 1 part of stearic acid, 3 parts of protective wax, and 6 parts of antioxidant, and mix at 40°C for 50 seconds; add 10 parts of plasticizer, and mix at 40°C for 4 minutes; add 105 parts of plasticizing filler, mix until the temperature reaches 110°C, and then discharge the rubber material; move the rubber material to an open mixer for thin sheeting, cool to room temperature, and obtain cold-resistant sheath material for cable.

[0030] Comparative Example 1 (changing the amount of 1,3,5-tri(4-vinylphenyl)benzene and methyl methacrylate added to the modified chloroprene rubber, and the remaining method steps are consistent with Example 1): S1: Take 100 parts of chloroprene rubber, add a mixed solvent of xylene and ethanol, stir and dissolve thoroughly, add 20 parts of 1,3,5-tri(4-vinylphenyl)benzene, 6 parts of acrylic acid, and 15 parts of methyl methacrylate, stir for 1 hour, add initiator potassium persulfate, heat to 70°C, stir and react for 6 hours, add inhibitor and antioxidant, stir and mix thoroughly, remove the solvent, and obtain modified chloroprene rubber;

[0031] S2: Take carbon black, zinc oxide and magnesium oxide in a mass ratio of 10:0.8:0.6, mix them evenly to obtain a composite filler; take 50 parts of the composite filler, add it into a mixed solvent of water and ethanol and disperse it evenly, add 3.5 parts of vinyl silane coupling agent, stir at 50°C for 5 hours to obtain a vinyl filler; add 12 parts of 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester and benzoyl peroxide, stir evenly, react at 80°C for 7 hours, cool to 60°C, add 22 parts of glutaraldehyde, 20 parts of octanoic acid glyceride, and 1.5 parts of thiosemicarbazide, stir evenly, keep warm and stir for 3 hours, remove the solvent, and obtain a plasticized filler;

[0032] S3: Cool the internal mixer with water, add 65 parts of chloroprene rubber, 40 parts of modified chloroprene rubber, 1 part of stearic acid, 3 parts of protective wax, and 5 parts of antioxidant, and mix at 40°C for 60 seconds; add 10 parts of plasticizer, and mix at 40°C for 5 minutes; add 100 parts of plasticizing filler, mix until the temperature reaches 110°C, and then discharge the rubber material; move the rubber material to an open mixer for thin sheeting, and cool to room temperature to obtain a cold-resistant sheath material for cable.

[0033] Comparative Example 2 (changing the amount of chloroprene rubber added in the modified chloroprene rubber, and the remaining method steps are consistent with Example 1): S1: Take 80 parts of chloroprene rubber, add a mixed solvent of xylene and ethanol, stir and dissolve thoroughly, add 12 parts of 1,3,5-tri(4-vinylphenyl)benzene, 6 parts of acrylic acid, and 20 parts of methyl methacrylate, stir for 1 hour, add initiator potassium persulfate, heat to 70°C, stir and react for 6 hours, add inhibitor and antioxidant, stir and mix thoroughly, remove the solvent, and obtain modified chloroprene rubber;

[0034] S2: Take carbon black, zinc oxide and magnesium oxide in a mass ratio of 10:0.8:0.6, mix them evenly to obtain a composite filler; take 50 parts of the composite filler, add it into a mixed solvent of water and ethanol and disperse it evenly, add 3.5 parts of vinyl silane coupling agent, stir at 50°C for 5 hours to obtain a vinyl filler; add 12 parts of 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester and benzoyl peroxide, stir evenly, react at 80°C for 7 hours, cool to 60°C, add 22 parts of glutaraldehyde, 20 parts of octanoic acid glyceride, and 1.5 parts of thiosemicarbazide, stir evenly, keep warm and stir for 3 hours, remove the solvent, and obtain a plasticized filler;

[0035] S3: Cool the internal mixer with water, add 65 parts of chloroprene rubber, 40 parts of modified chloroprene rubber, 1 part of stearic acid, 3 parts of protective wax, and 5 parts of antioxidant, and mix at 40°C for 60 seconds; add 10 parts of plasticizer, and mix at 40°C for 5 minutes; add 100 parts of plasticizing filler, mix until the temperature reaches 110°C, and then discharge the rubber material; move the rubber material to an open mixer for thin sheeting, and cool to room temperature to obtain a cold-resistant sheath material for cable.

[0036] Comparative Example 3 (the preparation process of the plasticizing filler is changed, and the other method steps are consistent with Example 1): S1: Take 100 parts of chloroprene rubber, add a mixed solvent of xylene and ethanol, stir and dissolve thoroughly, add 12 parts of 1,3,5-tri(4-vinylphenyl)benzene, 6 parts of acrylic acid, and 20 parts of methyl methacrylate, stir for 1 hour, add initiator potassium persulfate, heat to 70°C, stir and react for 6 hours, add inhibitor and antioxidant, stir and mix thoroughly, remove the solvent, and obtain modified chloroprene rubber;

[0037] S2: Take carbon black, zinc oxide and magnesium oxide in a mass ratio of 10:0.8:0.6, mix them evenly to obtain a composite filler; take 50 parts of the composite filler, add a mixed solvent of water and ethanol (the volume ratio of water and ethanol is 1:1) which is 10 times the mass of the composite filler and disperse it evenly, add 3.5 parts of vinyl silane coupling agent, stir at 50°C for 5 hours, filter and dry to obtain a vinyl filler; take 12 parts of 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester, 0.3% benzoyl peroxide of 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester, 60 parts of a mixed solvent of water and ethanol (the volume ratio of water and ethanol is 1:1), stir evenly, react at 80°C for 7 hours, cool to 60°C, add 22 parts of glutaraldehyde, 20 parts of caprylic acid glyceride, and 1.5 parts of thiosemicarbazide, stir evenly, keep warm and stir for 3 hours, remove the solvent, and plasticize the component; mix the above-mentioned plasticizing component with the vinyl filler to obtain a plasticized filler;

[0038] S3: Cool the internal mixer with water, add 65 parts of chloroprene rubber, 40 parts of modified chloroprene rubber, 1 part of stearic acid, 3 parts of protective wax, and 5 parts of antioxidant, and mix at 40°C for 60 seconds; add 10 parts of plasticizer, and mix at 40°C for 5 minutes; add 100 parts of plasticizer filler, mix, and discharge the rubber material after the temperature reaches 110°C; move the rubber material to an open mixer for thin sheeting, and cool to room temperature to obtain a cold-resistant sheath material for cable.

[0039] Comparative Example 4 (changing the amount of each raw material added in the plasticizing filler, and the remaining method steps are consistent with Example 1): S1: Take 100 parts of chloroprene rubber, add a mixed solvent of xylene and ethanol, stir and dissolve thoroughly, add 12 parts of 1,3,5-tri(4-vinylphenyl)benzene, 6 parts of acrylic acid, and 20 parts of methyl methacrylate, stir for 1 hour, add initiator potassium persulfate, heat to 70°C, stir and react for 6 hours, add inhibitor and antioxidant, stir and mix thoroughly, remove the solvent, and obtain modified chloroprene rubber;

[0040] S2: Take carbon black, zinc oxide and magnesium oxide in a mass ratio of 8:1:1, mix them evenly to obtain a composite filler; take 50 parts of the composite filler, add it into a mixed solvent of water and ethanol and disperse it evenly, add 3.5 parts of vinyl silane coupling agent, stir at 50°C for 5 hours to obtain a vinyl filler; add 12 parts of 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester and benzoyl peroxide, stir evenly, react at 80°C for 7 hours, cool to 60°C, add 22 parts of glutaraldehyde, 20 parts of octanoic acid glyceride, and 1.5 parts of thiosemicarbazide, stir evenly, keep warm and stir for 3 hours, remove the solvent, and obtain a plasticized filler;

[0041] S3: Cool the internal mixer with water, add 65 parts of chloroprene rubber, 40 parts of modified chloroprene rubber, 1 part of stearic acid, 3 parts of protective wax, and 5 parts of antioxidant, and mix at 40°C for 60 seconds; add 10 parts of plasticizer, and mix at 40°C for 5 minutes; add 100 parts of plasticized filler, mix, and discharge the rubber material after the temperature reaches 110°C; move the rubber material to an open mixer for thin sheeting, cool to room temperature, and obtain cold-resistant sheath material for cable.

[0042] In the above embodiments, the test methods used are conventional methods unless otherwise specified; the raw materials used are commercially available unless otherwise specified, and the sources of the raw materials are as follows: benzoyl peroxide (CAS: 94-36-0); ethanol (CAS: 64-17-5); xylene (CAS: 1330-20-7); vinyl trimethoxysilane (CAS: 2768-02-7); chloroprene rubber (DCR-36, Shanghai Zhengshang Chemical Technology Co., Ltd.); 1,3,5-tri(4-vinylphenyl)benzene (CAS: 944155-02-6); acrylic acid (CAS: 79-10-7); methyl methacrylate (CAS: 80-62-6); potassium persulfate (CAS: 7727-21-1); inhibitor (inhibitor 701, CAS: 2226 -96-2); antioxidant (antioxidant 264, CAS: 128-37-0); carbon black (rubber carbon black 550, Hubei Chengfeng Chemical Co., Ltd.); zinc oxide (S24314, Shanghai Yuanye); magnesium oxide (S27399, Shanghai Yuanye); 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester (CAS: 5919-74-4); glutaraldehyde (CAS: 111-30-8); caprylic acid glyceryl ester (S24816, Shanghai Yuanye); semicarbazide (CAS: 79-19-6); stearic acid (S30473, Shanghai Yuanye); protective wax (FNL-67ST, Qingdao Funo Chemical Technology Co., Ltd.); antioxidant (CAS: 101-87-1, antioxidant 4010); plasticizer (CAS: 2432-87-3, dioctyl sebacate).

[0043] Experiment: The cold-resistant sheath materials for cables prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were vulcanized at 160°C for 30 min. (1) The glass transition temperature was tested according to the reference standard GB / T19466.2-2004 (test conditions: -80°C to 25°C, 10°C / min); (2) The tensile strength was tested according to the reference standard GB / T528-2009. The specific data are shown in the table below.

[0044]

[0045] Conclusion: It can be seen from Comparative Examples 1 and 2 that changing the addition ratio of each raw material in the modified chloroprene rubber will significantly affect its performance. Therefore, it is necessary to strictly control the addition amount of each raw material during the grafting modification of the chloroprene rubber side chains to obtain a modified chloroprene rubber with a suitable structure; Comparative Example 3 changes the preparation process of the plasticized filler, and the vinylized filler and the plasticizing component prepared in the subsequent steps are mixed and added as the plasticized filler. Due to compatibility, migration and other problems, the performance is reduced; Comparative Example 4 changes the addition amount of each raw material in the plasticized filler, and the amount of magnesium oxide and zinc oxide increases, resulting in too high and too fast vulcanization, causing performance degradation; In summary, the cold-resistant sheath material for cables prepared by the present invention has good cold resistance and good mechanical properties.

[0046] Finally, it should be noted that the above is only a preferred embodiment of the present invention, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the spirit and principle of the present invention and within the technical scope disclosed in this application should be included in the protection scope of this application; in the absence of conflict, the embodiments of this application and the features in the embodiments can be combined with each other. Therefore, the protection scope of this application shall be based on the protection scope of the claims.

Claims

1. A method for preparing a cold-resistant sheath material for a cable, characterized in that: The following steps are involved: S1: Take chloroprene rubber and add the mixed solvent, stir and dissolve it thoroughly, add 1,3,5-tri(4-vinylphenyl)benzene, acrylic acid and methyl methacrylate, stir for 0.5-1h, add initiator, heat to 70°C, stir and react for 5-6h, add inhibitor and antioxidant, stir and mix well, remove the solvent, and obtain modified chloroprene rubber; S2: Take the composite filler, disperse it evenly in a mixed solvent of ethanol and water, add vinyl trimethoxy silane, stir at 40-60°C for 4-6 hours to obtain vinyl filler; add 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester and benzoyl peroxide, stir evenly, react at 78-80°C for 6-8 hours, cool to 55-60°C, add glutaraldehyde, 2-octyldecanoic acid glyceride, and thiosemicarbazide, keep warm and stir for 2-3 hours, remove the solvent, and obtain the plasticized filler; S3: Add chloroprene rubber, modified chloroprene rubber, stearic acid, protective wax and antioxidant into an internal mixer, mix at 40-45°C for 50-60 seconds; add plasticizer, mix at 40-45°C for 4-5 minutes; add plasticizer filler, mix until the temperature reaches 110°C and then discharge the rubber; move the rubber to an open mixer for thin sheeting, cool to room temperature, and obtain cold-resistant sheath material for cable; The cold-resistant sheath material for the cable includes the following raw materials, calculated by mass: 60-70 parts of chloroprene rubber, 35-45 parts of modified chloroprene rubber, 0.5-1 parts of stearic acid, 2-3 parts of protective wax, 4-6 parts of antioxidant, 8-10 parts of plasticizer, 100-105 parts of plasticizing filler; the modified chloroprene rubber includes the following raw materials, calculated by mass: 100 parts of chloroprene rubber, 10-12 parts of 1,3,5-tri(4-vinylphenyl)benzene, 5-8 parts of acrylic acid, 18~22 parts of methyl methacrylate; the plasticizing filler includes the following raw materials, calculated by mass: 50 parts of composite filler, 2~4 parts of vinyltrimethoxysilane, 10~12 parts of 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester, 20~25 parts of glutaraldehyde, 20~25 parts of caprylic acid glyceride, 1~2 parts of semicarbazide; the composite filler includes carbon black, zinc oxide and magnesium oxide in a mass ratio of 10: (0.6~0.8): (0.5~0.8).

2. The method for preparing a cold-resistant sheath material for a cable according to claim 1, characterized in that: The plasticizer is dioctyl sebacate.

3. A cold-resistant sheath material for cable prepared according to the method for preparing a cold-resistant sheath material for cable according to any one of claims 1 to 2.

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