High-temperature-resistant silicone rubber cable

Abstract

The invention relates to the technical field of cables, and provides a high-temperature-resistant silicone rubber cable which sequentially comprises a wire core, an insulating layer, a heat insulation layer, a shielding layer, a waterproof layer and a sheath layer from inside to outside, and the sheath layer is prepared from, by weight, 20-30 parts of silicone rubber, 20-40 parts of polyvinyl chloride resin, 10-15 parts of ethylene propylene diene monomer, 10-15 parts of filler, 1-3 parts of vulcanizing agent, 1.5-2 parts of accelerant and 1-3 parts of plasticizer. The filler comprises modifier modified red mud, and a modifier of the modifier modified red mud is a compound containing carboxyl. According to the technical scheme, the problem of poor high temperature resistance of the silicone rubber cable in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a high temperature resistant silicone rubber cable. Background Art

[0002] Silicone rubber is an excellent elastic insulating material based on polysiloxane. It is usually a single-component or two-component polymer. Silicone rubber can improve performance or reduce costs by including fillers. Products are made by adding various fillers through mixing, thin-pass, vulcanization, molding, extrusion, bonding and other production processes.

[0003] Silicone rubber cable is a cable with silicone rubber as insulation and sheath material. It has excellent aging resistance, ozone resistance, chemical resistance, low temperature flexibility and other characteristics. It is widely used in mobile equipment, frequency conversion control systems, instruments, electricity, petrochemicals and other fields. In some cases, silicone rubber cables need to be used in special occasions such as high temperature, so its high temperature resistance needs to be further improved. Summary of the invention

[0004] The invention provides a high temperature resistant silicone rubber cable, which solves the problem of poor high temperature resistance of the silicone rubber cable in the related art.

[0005] The technical solution of the present invention is as follows: The present invention provides a high-temperature resistant silicone rubber cable, which comprises a wire core, an insulating layer, a heat insulating layer, a shielding layer, a waterproof layer and a sheath layer in order from the inside to the outside. The raw materials of the sheath layer comprise the following components in parts by weight: 20 to 30 parts of silicone rubber, 20 to 40 parts of polyvinyl chloride resin, 10 to 15 parts of ethylene propylene rubber, 10 to 15 parts of filler, 1 to 3 parts of vulcanizer, 1.5 to 2 parts of accelerator and 1 to 3 parts of plasticizer. The filler comprises red mud modified by a modifier, and the modifier of the red mud modified by the modifier is a compound containing a carboxyl group.

[0006] As a further technical solution, the modifier is biphenyl dicarboxylic acid.

[0007] As a further technical solution, the raw materials for modifying red mud with the modifier include the modifier and red mud in a mass ratio of 1 to 5:40.

[0008] As a further technical solution, the mass ratio of the modifier to red mud is 3~4:40.

[0009] The present invention further improves the high temperature resistance of the silicone rubber cable by limiting the mass ratio of the modifier to the red mud to 3-4:40.

[0010] As a further technical solution, the filler also includes glass fiber.

[0011] The present invention further improves the high temperature resistance of the silicone rubber cable by limiting the filler to also include glass fiber and compounding the red mud modified by a modifier and the glass fiber.

[0012] As a further technical solution, the mass ratio of the modifier-modified red mud and the glass fiber is 1:9~9:1.

[0013] As a further technical solution, the mass ratio of the modifier-modified red mud and the glass fiber is 4:6~7:3.

[0014] The present invention further improves the high temperature resistance of the silicone rubber cable by limiting the mass ratio of the modifier-modified red mud and the glass fiber to 4:6-7:3.

[0015] As a further technical solution, the method for preparing the modifier-modified red mud comprises the following steps: The modifier is dissolved in ether, added into red mud, mixed evenly, and dried to obtain the modifier-modified red mud.

[0016] As a further technical solution, the method for preparing the sheath layer comprises the following steps: After the silicone rubber, polyvinyl chloride resin, EPDM rubber, filler, plasticizer and accelerator are mixed evenly, a vulcanizing agent is added and mixed evenly, and then extruded outside the waterproof layer to obtain a sheath layer.

[0017] As a further technical solution, the vulcanizing agent includes one or more of benzoyl peroxide, dicumyl peroxide, and tert-butyl perbenzoate.

[0018] As a further technical solution, the accelerator includes one or more of accelerator M, accelerator DM, and accelerator D.

[0019] As a further technical solution, the plasticizer includes one or both of paraffin oil and soybean oil.

[0020] The working principle and beneficial effects of the present invention are: In the present invention, a carboxyl-containing compound is selected to modify red mud to obtain a modifier-modified red mud, which is used as a filler for a silicone rubber cable sheath layer to reduce the alkalinity of the red mud, and the high temperature resistance of the sheath layer is improved by adjusting and optimizing the content of the red mud with silicone rubber, polyvinyl chloride resin, ethylene propylene diene monomer rubber, plasticizer, accelerator, vulcanizer and other components, thereby improving the high temperature resistance of the silicone rubber cable. DETAILED DESCRIPTION

[0021] 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.

[0022] A high temperature resistant silicone rubber cable comprises, from the inside to the outside, a wire core, an insulating layer, a heat insulating layer, a shielding layer, a waterproof layer, and a sheath layer. The preparation method of the sheath layer is as follows: In the following examples and comparative examples, the parameters of each raw material are as follows: The red mud is Bayer red mud with a particle size of 325 mesh; The model of silicone rubber is NE-5240, purchased from Shenzhen Jiahaixin Silicone Rubber Co., Ltd.; The polyvinyl chloride resin was DG-1000 from Tianjin Dagu Chemical; EPDM rubber is Sinopec Mitsui 3092PM; The model of glass fiber is EMG-35, which was purchased from Dongguan Rongtai Chemical Co., Ltd.

[0023] Example 1 S1, dissolving 1 part of biphenyl dicarboxylic acid in 50 parts of ether, adding 40 parts of red mud, mixing evenly, and drying to obtain modifier-modified red mud; S2. After uniformly mixing 20 parts of silicone rubber, 20 parts of polyvinyl chloride resin, 10 parts of EPDM rubber, 10 parts of modifier-modified red mud, 1.5 parts of accelerator M and 1 part of paraffin oil, 1 part of tert-butyl perbenzoate is added and the mixture is continued to be mixed, and the mixture is extruded outside the waterproof layer to obtain a sheath layer.

[0024] Example 2 S1, dissolving 5 parts of biphenyl dicarboxylic acid in 50 parts of ether, adding 40 parts of red mud, mixing evenly, and drying to obtain modifier-modified red mud; S2. After uniformly mixing 30 parts of silicone rubber, 40 parts of polyvinyl chloride resin, 15 parts of EPDM rubber, 15 parts of modifier-modified red mud, 2 parts of accelerator D, and 3 parts of soybean oil, 3 parts of benzoyl peroxide are added and continued to mix, and the mixture is extruded outside the waterproof layer to obtain a sheath layer.

[0025] Example 3 The difference from Example 1 is only that: 5 parts of biphenyl dicarboxylic acid.

[0026] Example 4 The difference from Example 1 is only that: 3 parts of biphenyl dicarboxylic acid.

[0027] Example 5 The difference from Example 1 is only that: 4 parts of biphenyl dicarboxylic acid.

[0028] Example 6 S1, dissolving 4 parts of biphenyl dicarboxylic acid in 50 parts of ether, adding 40 parts of red mud, mixing evenly, and drying to obtain modifier-modified red mud; S2. After uniformly mixing 20 parts of silicone rubber, 20 parts of polyvinyl chloride resin, 10 parts of EPDM rubber, 1 part of glass fiber, 9 parts of modifier-modified red mud, 1.5 parts of accelerator M and 1 part of paraffin oil, 1 part of tert-butyl perbenzoate is added and the mixture is continued to be mixed. The mixture is then extruded outside the waterproof layer to obtain a sheath layer.

[0029] Example 7 The only difference from Example 6 is: 9 parts of glass fiber and 1 part of modifier-modified red mud.

[0030] Example 8 The only difference from Example 6 is: 4 parts of glass fiber and 6 parts of modifier-modified red mud.

[0031] Example 9 The only difference from Example 6 is: 7 parts of glass fiber and 3 parts of modifier-modified red mud.

[0032] Comparative Example 1 After uniformly mixing 20 parts of silicone rubber, 20 parts of polyvinyl chloride resin, 10 parts of EPDM rubber, 10 parts of red mud, 1.5 parts of accelerator M and 1 part of paraffin oil, 1 part of tert-butyl peroxybenzoate was added and continued to mix, and then extruded outside the waterproof layer to obtain a sheath layer.

[0033] Test example The sheath layer of the silicone rubber cable prepared in Examples 1 to 9 and Comparative Example 1 was cut axially according to the method in GB / T 2951.11-2008, and a narrow strip was taken to prepare a dumbbell specimen with a thickness of 3 mm. The specimen was subjected to heat aging treatment (135°C, 168h). After the treated specimen was placed in an environment of 25°C for 16h, a tensile test was performed on the specimens before and after the heat aging treatment according to the standard of GB / T2951.11-2008, and the tensile strength change rate was calculated according to the following formula: Tensile strength change rate = (tensile strength before treatment - tensile strength after treatment) ÷ tensile strength before treatment × 100%; The results are shown in Table 1.

[0034] Table 1 Tensile strength test results of Examples 1 to 9 and Comparative Example 1

[0035] Compared with Comparative Example 1, the red mud in the raw material of the silicone rubber cable sheath layer prepared in Example 1 and Examples 3 to 5 is red mud modified with diphenyl dicarboxylic acid. As a result, the tensile strength of Example 1 and Examples 3 to 5 before treatment is greater than that of Comparative Example 1, and the tensile change rate is smaller than that of Comparative Example 1, indicating that the red mud is red mud modified with diphenyl dicarboxylic acid, which can improve the high temperature resistance of the silicone rubber cable.

[0036] The tensile strength of the sheath layer of the silicone rubber cable prepared in Examples 4 to 5 before treatment is greater than that in Example 1 and Example 3, and the tensile change rate is smaller than that in Example 1 and Example 3, indicating that the mass ratio of biphenyl dicarboxylic acid to red mud is 3 to 4:40, which further improves the high temperature resistance of the silicone rubber cable sheath layer and further improves the high temperature resistance of the silicone rubber cable.

[0037] The tensile strength of the sheath layer of the silicone rubber cable prepared in Examples 6 to 9 before treatment is greater than that in Example 5, and the tensile change rate is smaller than that in Example 5, indicating that the compound use of the modifier-modified red mud and the glass fiber further improves the high temperature resistance of the silicone rubber cable sheath layer, and further improves the high temperature resistance of the silicone rubber cable.

[0038] The tensile strength of the sheath layer of the silicone rubber cable prepared in Examples 8 to 9 before treatment is greater than that in Examples 6 to 7, and the tensile change rate is smaller than that in Examples 6 to 7, indicating that the mass ratio of the modifier-modified red mud and the glass fiber is 4:6 to 7:3, which further improves the high temperature resistance of the silicone rubber cable sheath layer and further improves the high temperature resistance of the silicone rubber cable.

[0039] 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 temperature resistant silicone rubber cable, comprising a core, an insulating layer, a heat insulating layer, a shielding layer, a waterproof layer, and a sheath layer from the inside to the outside, characterized in that: The raw materials of the sheath layer include the following components in parts by weight: 20-30 parts of silicone rubber, 20-40 parts of polyvinyl chloride resin, 10-15 parts of ethylene propylene rubber, 10-15 parts of filler, 1-3 parts of vulcanizer, 1.5-2 parts of accelerator, and 1-3 parts of plasticizer. The filler includes modifier-modified red mud, and the modifier of the modifier-modified red mud is a compound containing a carboxyl group.

2. A high temperature resistant silicone rubber cable according to claim 1, characterized in that: The modifier is biphenyl dicarboxylic acid.

3. A high temperature resistant silicone rubber cable according to claim 1, characterized in that: The raw materials for modifying red mud with a modifier include the modifier and red mud in a mass ratio of 1 to 5:

40.

4. A high temperature resistant silicone rubber cable according to claim 3, characterized in that: The mass ratio of the modifier to the red mud is 3-4:

40.

5. The high temperature resistant silicone rubber cable according to claim 1, characterized in that: The filler also includes glass fibers.

6. A high temperature resistant silicone rubber cable according to claim 5, characterized in that: The mass ratio of the modifier-modified red mud to the glass fiber is 1:9 to 9:

1.

7. A high temperature resistant silicone rubber cable according to claim 6, characterized in that: The mass ratio of the modifier-modified red mud to the glass fiber is 4:6-7:

3.

8. The high temperature resistant silicone rubber cable according to claim 1, characterized in that: The method for preparing red mud modified by a modifier comprises the following steps: The modifier is dissolved in ether, added into red mud, mixed evenly, and dried to obtain the modifier-modified red mud.

9. A high temperature resistant silicone rubber cable according to any one of claims 1 to 8, characterized in that: The method for preparing the sheath layer comprises the following steps: After the silicone rubber, polyvinyl chloride resin, EPDM rubber, filler, plasticizer and accelerator are mixed evenly, the vulcanizing agent is added and mixed evenly, and then extruded outside the waterproof layer to obtain the sheath layer.

10. The high temperature resistant silicone rubber cable according to claim 1, characterized in that: The vulcanizing agent includes one or more of benzoyl peroxide, dicumyl peroxide, and tert-butyl perbenzoate.

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