A high wear-resistant rubber sheathed cable for mining

Abstract

The present invention relates to the field of cable technology, and proposes a high wear-resistant rubber sheathed cable for mining, which includes a conductor, an insulating layer and a sheath layer from the inside to the outside, and the raw materials of the sheath layer include the following components by weight: 50-60 parts of styrene-butadiene rubber, 15-25 parts of nitrile rubber, 25-40 parts of modified garnet powder, 4-6 parts of molybdenum disulfide, 1-3 parts of stearic acid, 3-5 parts of aromatic oil, 2-4 parts of antioxidant, 1-3 parts of vulcanizing agent, and 2-4 parts of accelerator; the raw materials of the modified garnet powder include garnet powder and polyethylene aniline. Through the above technical scheme, the problem of poor aging resistance and poor wear resistance of the sheath layer of the mining rubber sheathed cable in the related art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of cables, and in particular to a highly wear-resistant rubber sheathed cable for mining. Background Art

[0002] Rubber sheathed cable is a soft and movable cable with multiple strands of thin copper wire as conductor, rubber insulation and rubber sheath. This cable can be widely used in industrial and agricultural fields, such as power supply for various industrial and agricultural machinery and equipment, and can also be used for small equipment such as household appliances and power tools. There are many types of rubber sheathed cables, including general rubber sheathed soft cables, welding machine cables, submersible motor cables and mining rubber sheathed cables. Mining rubber sheathed cable is a special rubber sheathed cable suitable for coal mines and other mining environments. Due to the influence of special environment and working conditions, the sheath layer of mining rubber sheathed cable is required to have sufficient mechanical properties, as well as good wear resistance and aging resistance.

[0003] However, at present, the aging resistance and wear resistance of the sheath layer of the mining rubber sheathed cable are limited. In complex environments such as mines, long-term exposure to moisture and corrosive substances such as acids and alkalis will accelerate the aging of the sheath layer of the mining rubber sheathed cable, causing the mining rubber sheathed cable to become hard, brittle, and even cracked. In mine operations, the sheath layer of the mining rubber sheathed cable will also be subjected to mechanical actions such as friction and scratching, and its wear resistance will be further affected. Therefore, improving the aging resistance and wear resistance of the sheath layer of the mining rubber sheathed cable is of great significance to ensure the safety of mine operations and extend the service life of mining rubber sheathed cables. Summary of the invention

[0004] The invention provides a highly wear-resistant rubber sheathed cable for mining, which solves the problem of poor aging resistance and wear resistance of the sheath layer of the rubber sheathed cable for mining in the related art.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention provides a high wear-resistant rubber sheathed cable for mining, which comprises a conductor, an insulating layer and a sheath layer from the inside to the outside, and the raw materials of the sheath layer include the following components in parts by weight:

[0007] 50-60 parts of styrene-butadiene rubber, 15-25 parts of nitrile rubber, 25-40 parts of modified garnet powder, 4-6 parts of molybdenum disulfide, 1-3 parts of stearic acid, 3-5 parts of aromatic oil, 2-4 parts of antioxidant, 1-3 parts of vulcanizing agent, and 2-4 parts of accelerator;

[0008] The raw materials of the modified garnet powder include garnet powder and polyethylene aniline.

[0009] As a further technical solution, the weight ratio of the garnet powder to polyethylene aniline is 5-35:1.

[0010] When the weight ratio of garnet powder to polyethylene aniline is 5-35:1, the aging resistance and wear resistance of the sheath layer of the mining rubber sheathed cable can be further improved.

[0011] As a further technical solution, the preparation method of the modified garnet powder comprises the following steps: dissolving the polyvinyl aniline in dimethyl sulfoxide to obtain a polyvinyl aniline solution, adding the garnet powder to the polyvinyl aniline solution, dispersing evenly, and drying to obtain the modified garnet powder.

[0012] As a further technical solution, the mass fraction of the polyethylene aniline solution is 6% to 10%.

[0013] As a further technical solution, the raw material of the modified garnet powder also includes benzamide compounds.

[0014] When the raw materials of the modified garnet powder also include benzamide compounds, the garnet powder is modified together with benzamide compounds and polyethylene aniline, which can further improve the aging resistance and wear resistance of the sheath layer of the mining rubber sheathed cable. The reason may be that the addition of benzamide compounds can improve the modification effect of polyethylene aniline on garnet powder, further promote the close bonding between garnet powder and the matrix material, thereby further improving the aging resistance and wear resistance of the sheath layer of the mining rubber sheathed cable.

[0015] As a further technical solution, the weight ratio of the polyethylene aniline to the benzamide compound is 1-2:1.

[0016] When the weight ratio of polyethylene aniline to benzamide compounds is 1-2:1, the aging resistance and wear resistance of the sheath layer of the mining rubber sheathed cable can be further improved.

[0017] As a further technical solution, the preparation method of the modified garnet powder comprises the following steps: dissolving the benzamide compound and polyvinyl aniline in dimethyl sulfoxide to obtain a mixed solution, adding the garnet powder to the mixed solution, dispersing evenly, and drying to obtain the modified garnet powder.

[0018] As a further technical solution, the sum of the mass fractions of the benzamide compound and the polyethylene aniline in the mixed solution is 10% to 15%.

[0019] As a further technical solution, the benzamide compound is one or more of 4-hydroxythiobenzamide, thiobenzamide, and 4-hydroxybenzamide, preferably 4-hydroxythiobenzamide.

[0020] As a further technical solution, the conductor is a copper conductor.

[0021] As a further technical solution, the insulating layer is a styrene-butadiene rubber layer.

[0022] As a further technical solution, the antioxidant is one or more of antioxidant 4010NA, antioxidant RD, and antioxidant 2246.

[0023] As a further technical solution, the vulcanizing agent is one or both of sulfur and benzoyl peroxide.

[0024] As a further technical solution, the accelerator is one or more of zinc oxide, accelerator DBU-B, and accelerator M.

[0025] The present invention also proposes a method for preparing the highly wear-resistant rubber sheathed cable for mining, comprising the following steps:

[0026] S1, mixing the styrene-butadiene rubber, nitrile-butadiene rubber, modified garnet powder and accelerator for the first time, adding the remaining components in the sheath layer for the second mixing, extruding, and vulcanizing to obtain a sheath layer material;

[0027] S2, coating the insulating layer on the surface of the conductor to obtain a conductor coated with the insulating layer;

[0028] S3. The sheath layer material is coated on the surface of the conductor coated with the insulating layer to obtain a highly wear-resistant rubber sheathed cable for mining.

[0029] As a further technical solution, in step S1, during the extrusion, the temperature is 110-130° C.; during the vulcanization, the temperature is 125-135° C., and the vulcanization time is 8-14 min.

[0030] The working principle and beneficial effects of the present invention are:

[0031] In the present invention, rubber material is used as the base material of the sheath layer of the mining rubber sheath cable, and under the joint action of other components such as modified garnet powder, antioxidant, vulcanizer, etc., the mining rubber sheath cable sheath layer with good aging resistance and good wear resistance can be prepared, wherein the garnet powder is surface modified by polyethylene aniline so that the garnet powder is evenly dispersed in the sheath layer material, and the interface bonding ability between the garnet powder and the base material can be improved, so that the internal structure of the sheath layer is denser, thereby significantly improving the aging resistance and wear resistance of the mining rubber sheath cable sheath layer. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the following embodiments and comparative examples, the model of styrene-butadiene rubber is YH-792E; the model of nitrile rubber is 35LM; the particle size of garnet powder is 325 mesh; the model of aromatic oil is D60; the number average molecular weight of polyethylene aniline is 50,000, and the manufacturer is Wuhan Maikairui Chemical Co., Ltd.; the copper conductor is pure copper; and the insulating layer is a styrene-butadiene rubber layer.

[0034] Example 1

[0035] A high wear-resistant rubber sheathed cable for mining includes a conductor, an insulating layer and a sheath layer from the inside to the outside, and the raw materials of the sheath layer include the following components in parts by weight:

[0036] 50 parts of styrene-butadiene rubber, 15 parts of nitrile rubber, 25 parts of modified garnet powder, 4 parts of molybdenum disulfide, 1 part of stearic acid, 3 parts of aromatic oil, 2 parts of antioxidant RD, 1 part of sulfur, 2 parts of zinc oxide;

[0037] The raw materials of the modified garnet powder include 20 parts of garnet powder and 5 parts of polyethylene aniline;

[0038] The preparation method of modified garnet powder comprises the following steps: dissolving 5 parts of polyvinyl aniline in dimethyl sulfoxide to obtain a polyvinyl aniline solution with a mass fraction of 7%, adding 20 parts of garnet powder to the polyvinyl aniline solution with a mass fraction of 7%, dispersing the mixture evenly, and concentrating the mixture to dryness to obtain modified garnet powder;

[0039] The preparation method of the high wear-resistant rubber sheathed cable for mining comprises the following steps:

[0040] S1, mixing styrene-butadiene rubber, nitrile rubber, modified garnet powder and accelerator for the first time, adding the remaining components in the sheath layer for the second mixing, extruding, and vulcanizing at 125° C. for 14 minutes to obtain a sheath layer material;

[0041] During extrusion, the extrusion temperature of zone 1 is 110°C, the extrusion temperature of zone 2 is 130°C, and the extrusion temperature of zone 3 is 120°C;

[0042] S2, coating the surface of the copper conductor with an insulating layer to obtain a conductor coated with the insulating layer;

[0043] S3. Wrap the sheath layer material on the surface of the conductor coated with the insulating layer to obtain a high wear-resistant rubber sheathed cable for mining.

[0044] Example 2

[0045] A high wear-resistant rubber sheathed cable for mining includes a conductor, an insulating layer and a sheath layer from the inside to the outside, and the raw materials of the sheath layer include the following components in parts by weight:

[0046] 55 parts of styrene-butadiene rubber, 20 parts of nitrile rubber, 36 parts of modified garnet powder, 5 parts of molybdenum disulfide, 2 parts of stearic acid, 4 parts of aromatic oil, 3 parts of antioxidant RD, 2 parts of sulfur, and 3 parts of zinc oxide;

[0047] The raw materials of the modified garnet powder include 29 parts of garnet powder and 7 parts of polyethylene aniline;

[0048] The preparation method of modified garnet powder comprises the following steps: dissolving 7 parts of polyvinyl aniline in dimethyl sulfoxide to obtain a polyvinyl aniline solution with a mass fraction of 7%, adding 29 parts of garnet powder to the polyvinyl aniline solution with a mass fraction of 7%, dispersing the mixture evenly, and concentrating the mixture to dryness to obtain modified garnet powder;

[0049] The preparation method of the high wear-resistant rubber sheathed cable for mining comprises the following steps:

[0050] S1, mixing styrene-butadiene rubber, nitrile rubber, modified garnet powder and accelerator for the first time, adding the remaining components in the sheath layer for the second mixing, extruding, and vulcanizing at 130° C. for 11 minutes to obtain a sheath layer material;

[0051] During extrusion, the extrusion temperature of zone 1 is 110°C, the extrusion temperature of zone 2 is 130°C, and the extrusion temperature of zone 3 is 120°C;

[0052] S2, coating the surface of the copper conductor with an insulating layer to obtain a conductor coated with the insulating layer;

[0053] S3. Wrap the sheath layer material on the surface of the conductor coated with the insulating layer to obtain a high wear-resistant rubber sheathed cable for mining.

[0054] Example 3

[0055] A high wear-resistant rubber sheathed cable for mining includes a conductor, an insulating layer and a sheath layer from the inside to the outside, and the raw materials of the sheath layer include the following components in parts by weight:

[0056] 60 parts of styrene-butadiene rubber, 25 parts of nitrile rubber, 40 parts of modified garnet powder, 6 parts of molybdenum disulfide, 3 parts of stearic acid, 5 parts of aromatic oil, 4 parts of antioxidant RD, 3 parts of sulfur, 4 parts of zinc oxide;

[0057] The raw materials of the modified garnet powder include 32 parts of garnet powder and 8 parts of polyethylene aniline;

[0058] The preparation method of modified garnet powder comprises the following steps: dissolving 8 parts of polyvinyl aniline in dimethyl sulfoxide to obtain a polyvinyl aniline solution with a mass fraction of 7%, adding 32 parts of garnet powder to the polyvinyl aniline solution with a mass fraction of 7%, dispersing the mixture evenly, and concentrating the mixture to dryness to obtain modified garnet powder;

[0059] The preparation method of the high wear-resistant rubber sheathed cable for mining comprises the following steps:

[0060] S1, mixing styrene-butadiene rubber, nitrile rubber, modified garnet powder and accelerator for the first time, adding the remaining components in the sheath layer for the second mixing, extruding, and vulcanizing at 135° C. for 8 minutes to obtain a sheath layer material;

[0061] During extrusion, the extrusion temperature of zone 1 is 110°C, the extrusion temperature of zone 2 is 130°C, and the extrusion temperature of zone 3 is 120°C;

[0062] S2, coating the surface of the copper conductor with an insulating layer to obtain a conductor coated with the insulating layer;

[0063] S3. Wrap the sheath layer material on the surface of the conductor coated with the insulating layer to obtain a high wear-resistant rubber sheathed cable for mining.

[0064] Example 4

[0065] The difference between this embodiment and embodiment 2 is that, in this embodiment, 35.5 parts of garnet powder and 0.5 parts of polyethylene aniline are added.

[0066] Example 5

[0067] The difference between this embodiment and embodiment 2 is that, in this embodiment, 30 parts of garnet powder and 6 parts of polyethylene aniline are added.

[0068] Example 6

[0069] The difference between this embodiment and embodiment 2 is that, in this embodiment, 35 parts of garnet powder and 1 part of polyethylene aniline are added.

[0070] Example 7

[0071] The only difference between this embodiment and embodiment 6 is that, in this embodiment, the raw materials of the modified garnet powder include garnet powder, 4-hydroxythiobenzamide and polyethylene aniline, and the preparation method of the modified garnet powder includes the following steps: dissolving 0.3 parts of 4-hydroxythiobenzamide and 1 part of polyethylene aniline in dimethyl sulfoxide to obtain a mixed solution in which the sum of the mass fractions of benzamide compounds and polyethylene aniline is 10%, adding 35 parts of garnet powder to the mixed solution, dispersing evenly, and concentrating to dryness to obtain modified garnet powder.

[0072] Example 8

[0073] The difference between this embodiment and embodiment 7 is that, in this embodiment, 35 parts of garnet powder, 1.5 parts of 4-hydroxythiobenzamide and 1 part of polyethylene aniline are added.

[0074] Example 9

[0075] The difference between this embodiment and embodiment 7 is that, in this embodiment, 35 parts of garnet powder, 1 part of 4-hydroxythiobenzamide and 1 part of polyethylene aniline are added.

[0076] Example 10

[0077] The difference between this embodiment and embodiment 7 is that, in this embodiment, 35 parts of garnet powder, 0.5 parts of 4-hydroxythiobenzamide and 1 part of polyethylene aniline are added.

[0078] Comparative Example 1

[0079] The only difference between this comparative example and Example 1 is that in this comparative example, 25 parts of modified garnet powder are replaced by an equal amount of garnet powder.

[0080] Comparative Example 2

[0081] A high wear-resistant rubber sheathed cable for mining includes a conductor, an insulating layer and a sheath layer from the inside to the outside, and the raw materials of the sheath layer include the following components in parts by weight:

[0082] 50 parts of styrene-butadiene rubber, 15 parts of nitrile rubber, 20 parts of garnet powder, 5 parts of polyethylene aniline, 4 parts of molybdenum disulfide, 1 part of stearic acid, 3 parts of aromatic oil, 2 parts of antioxidant RD, 1 part of sulfur, 2 parts of zinc oxide;

[0083] The preparation method of the high wear-resistant rubber sheathed cable for mining comprises the following steps:

[0084] S1, mixing styrene-butadiene rubber, nitrile rubber, garnet powder, polyethylene aniline and accelerator for the first time, adding the remaining components in the sheath layer for the second mixing, extruding, and vulcanizing at 125° C. for 14 minutes to obtain a sheath layer material;

[0085] During extrusion, the extrusion temperature of zone 1 is 110°C, the extrusion temperature of zone 2 is 130°C, and the extrusion temperature of zone 3 is 120°C;

[0086] S2, coating the surface of the copper conductor with an insulating layer to obtain a conductor coated with the insulating layer;

[0087] S3. Wrap the sheath layer material on the surface of the conductor coated with the insulating layer to obtain a high wear-resistant rubber sheathed cable for mining.

[0088] The sheath layers of the mining rubber sheathed cables prepared in Examples 1 to 10 and Comparative Examples 1 to 2 were subjected to the following performance tests:

[0089] ① Aging resistance: The sheath layer of the mining rubber sheathed cable prepared in Examples 1 to 10 and Comparative Examples 1 to 2 was subjected to a tensile strength test before the aging test according to GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", wherein the sheath layer sample was a type 1 dumbbell-shaped sample, and the test speed was 500 mm / min; after the aging test was carried out according to GB / T3512-2014 "Hot air accelerated aging and heat resistance test of vulcanized rubber or thermoplastic rubber", the tensile strength after the aging test was measured according to the above tensile strength test method, and the aging tensile strength change rate was calculated according to the following formula: aging tensile strength change rate (%) = (tensile strength before aging test - tensile strength after aging test) / tensile strength before aging test × 100%, wherein the conditions of the aging test were: temperature 80°C, exposure time 240h; the test results were all average values ​​of 3 samples, and the test results are shown in Table 1 below.

[0090] ② Wear resistance test: The sheath layer of the mining rubber sheathed cable prepared in Examples 1 to 10 and Comparative Examples 1 to 2 was tested for DIN wear according to DIN53516 standard using a DIN wear tester (model: OX-780). The result is the average value of 3 samples. The test results are shown in Table 1 below.

[0091] Table 1 Test results of aging resistance and wear resistance of Examples 1 to 10 and Comparative Examples 1 to 2

[0092]

[0093] Compared with comparative examples 1 to 2, the aging resistance tensile strength change rate of Example 1 is significantly reduced, and the DIN abrasion is significantly reduced, indicating that the surface modification of garnet powder by polyethylene aniline in the sheath layer of the mining rubber sheathed cable can significantly improve the aging resistance and wear resistance of the sheath layer of the mining rubber sheathed cable.

[0094] Compared with Examples 2 and 4, the aging resistance tensile strength change rate of Examples 5 to 6 is reduced, and the DIN abrasion is reduced, indicating that when the weight ratio of garnet powder to polyethylene aniline is 5 to 35:1, the aging resistance and wear resistance of the sheath layer of the mining rubber sheathed cable can be further improved.

[0095] Compared with Example 6, the change rate of the aging-resistant tensile strength of Examples 7 to 10 is reduced, and the DIN abrasion is reduced, indicating that when the garnet powder is modified by using benzamide compounds and polyethylene aniline together, the aging resistance and wear resistance of the sheath layer of the mining rubber sheathed cable can be further improved. In addition, compared with Examples 7 to 8, the change rate of the aging-resistant tensile strength of Examples 9 to 10 is reduced, and the DIN abrasion is reduced, indicating that when the weight ratio of polyethylene aniline to benzamide compounds is 1 to 2:1, the aging resistance and wear resistance of the sheath layer of the mining rubber sheathed cable can be further improved.

[0096] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high wear-resistant rubber sheathed cable for mining, characterized in that: It includes a conductor, an insulating layer and a sheath layer from the inside to the outside, and the raw materials of the sheath layer include the following components in parts by weight: 50-60 parts of styrene-butadiene rubber, 15-25 parts of nitrile rubber, 25-40 parts of modified garnet powder, 4-6 parts of molybdenum disulfide, 1-3 parts of stearic acid, 3-5 parts of aromatic oil, 2-4 parts of antioxidant, 1-3 parts of vulcanizing agent, and 2-4 parts of accelerator; The raw materials of the modified garnet powder include garnet powder, polyethylene aniline and benzamide compounds; The preparation method of the modified garnet powder comprises the following steps: dissolving the benzamide compound and polyvinyl aniline in dimethyl sulfoxide to obtain a mixed solution, adding the garnet powder into the mixed solution, dispersing evenly, and drying to obtain the modified garnet powder.

2. A high wear-resistant rubber sheathed cable for mining according to claim 1, characterized in that: The weight ratio of the garnet powder to polyvinyl aniline is 5-35:

1.

3. A high wear-resistant rubber sheathed cable for mining according to claim 1, characterized in that: The weight ratio of the polyethylene aniline to the benzamide compound is 1-2:

1.

4. A high wear-resistant rubber sheathed cable for mining according to claim 1, characterized in that: The benzamide compound is one or more of 4-hydroxythiobenzamide, thiobenzamide and 4-hydroxybenzamide.

5. A high wear-resistant rubber sheathed cable for mining according to claim 1, characterized in that: The antioxidant is one or more of antioxidant 4010NA, antioxidant RD, and antioxidant 2246.

6. A high wear-resistant rubber sheathed cable for mining according to claim 1, characterized in that: The vulcanizing agent is one or both of sulfur and benzoyl peroxide.

7. A high wear-resistant rubber sheathed cable for mining according to claim 1, characterized in that: The accelerator is one or more of zinc oxide, accelerator DBU-B and accelerator M.

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