A high temperature resistant flat cable

Abstract

The present invention relates to the field of cable technology, and proposes a high temperature resistant flat cable, comprising a conductor, an outer wrapped insulating layer of the conductor, an outer braided armor layer of the insulating layer, and an outer extruded sheath layer of the armor layer; the conductor is a copper conductor or an aluminum conductor; the armor layer is an aluminum wire armor layer; the raw materials of the sheath layer include the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 40-60 parts of ternary isopropyl rubber, and 30-40 parts of modified nano silicon dioxide; the raw materials of the modified nano silicon dioxide include a modifier and nano silicon dioxide in a weight ratio of 1-5:49; the modifier includes methyl methacrylate-styrene copolymer. Through the above technical scheme, the problem of poor high temperature resistance of the sheath layer of the flat cable in the related 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 flat cable. Background Art

[0002] With the rapid development of modern industry, the automation level of equipment continues to improve in high-temperature industrial environments such as steel metallurgy, glass manufacturing, and kiln baking. In such an environment, the equipment has extremely high requirements for stable and reliable power transmission and signal control.

[0003] The limitations of traditional round cables are increasingly evident under these special working conditions. In some high-temperature areas with small spaces or where frequent bending and movement are required, round cables have many problems. They occupy a large space and are easily damaged during frequent bending due to the limited bending radius. These problems have given rise to a strong demand for high-temperature resistant flat cables.

[0004] The high temperature resistance of the flat cable sheath has a direct impact on the overall high temperature resistance of the flat cable. At present, ordinary rubber sheath materials are very prone to aging and cracking in high temperature environments, which leads to the loss of their protective function. In view of this, it is urgent to develop a flat cable with a high temperature resistant sheath. Summary of the invention

[0005] The invention provides a high temperature resistant flat cable, which solves the problem of poor high temperature resistance of the flat cable sheath layer in the related art.

[0006] The technical solution of the present invention is as follows: The present invention provides a high temperature resistant flat cable, comprising a conductor, an insulating layer wrapped around the outer side of the conductor, an armor layer woven on the outer side of the insulating layer, and a sheath layer extruded on the outer side of the armor layer; The conductor is a copper conductor or an aluminum conductor; The armor layer is an aluminum wire armor layer; The raw materials of the sheath layer include the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 40-60 parts of ternary isopropyl rubber, and 30-40 parts of modified nano-silicon dioxide; The raw materials of the modified nano-silicon dioxide include a modifier and nano-silicon dioxide in a weight ratio of 1 to 5:49; The modifier includes methyl methacrylate-styrene copolymer.

[0007] As a further technical solution, the raw materials of the insulating layer include the following components in parts by weight: 100 parts of butyl rubber, 15-30 parts of carbon black, 4-8 parts of stearic acid, 3-5 parts of sulfur, and 4-6 parts of zinc oxide.

[0008] As a further technical solution, the weight ratio of the modifier to the nano-silicon dioxide is 1.5~3:49.

[0009] In the present invention, when the weight ratio of the modifier to the nano-silicon dioxide is 1.5-3:49, it helps to further improve the high temperature resistance of the flat cable sheath layer.

[0010] As a further technical solution, the modifier further comprises polyvinyl butyral, and the weight ratio of the methyl methacrylate-styrene copolymer to polyvinyl butyral is 10:2-5.

[0011] In the present invention, the inventors found that when the modifier also includes polyvinyl butyral, it is helpful to further improve the high temperature resistance of the flat cable sheath layer. It is speculated that the addition of polyvinyl butyral can play a bridging role between methyl methacrylate-styrene copolymer and nano-silicon dioxide, further improving the modification effect of methyl methacrylate-styrene copolymer on nano-silicon dioxide, thereby further improving the high temperature resistance of the flat cable sheath layer.

[0012] As a further technical solution, the preparation method of the modified nano-silicon dioxide comprises the following steps: melting the modifier, adding the nano-silicon dioxide, dispersing evenly, and cooling to obtain the modified nano-silicon dioxide.

[0013] As a further technical solution, the median particle size of the nano-silicon dioxide is 30-60 nm.

[0014] As a further technical solution, the raw materials of the sheath layer also include 4 to 6 parts of plasticizer, 1 to 3 parts of antioxidant, and 3 to 5 parts of vulcanizer.

[0015] As a further technical solution, the plasticizer includes one or more of TP-95, TOTM, and DBP.

[0016] In the present invention, the addition of the plasticizer helps the sheath layer to be accurately formed during the extrusion process and maintain its shape during subsequent processing and use, thereby improving the surface quality of the sheath layer.

[0017] As a further technical solution, the antioxidant includes one or more of antioxidant 2246, antioxidant 264, and antioxidant MB.

[0018] In the present invention, the addition of the antioxidant can prolong the service life of the sheath layer, so that the sheath layer can maintain good physical properties during long-term use.

[0019] As a further technical solution, the vulcanizing agent includes one or more of DTBP, DCP, and DBPH.

[0020] In the present invention, a peroxide vulcanizing agent is used, which can provide an efficient vulcanization reaction, promote the formation of a three-dimensional network cross-linked structure inside the sheath layer, and thus improve the physical properties of the sheath layer.

[0021] The present invention also provides a method for preparing the high temperature resistant flat cable, comprising the following steps: S1. Mix the components except the vulcanizing agent in the raw material of the sheath layer uniformly, then add the vulcanizing agent and mix uniformly, extrude, and granulate to obtain a sheath layer masterbatch; S2, wrapping the insulating layer around the outside of the conductor, weaving the armor layer outside the insulating layer, extruding the sheath layer masterbatch around the outside of the armor layer, and vulcanizing to obtain the flat cable.

[0022] As a further technical solution, in step S1, the temperature during extrusion is 130-150°C.

[0023] As a further technical solution, in step S2, during the vulcanization, the temperature is 160-180° C. and the time is 15-20 minutes.

[0024] As a further technical solution, the method for preparing the insulating layer comprises the following steps: uniformly mixing the components except sulfur and zinc oxide in the insulating layer raw materials, then adding sulfur and zinc oxide, extruding, and vulcanizing to obtain the insulating layer.

[0025] As a further technical solution, during the preparation of the insulating layer, the temperature during the extrusion is 120-150°C, and during the vulcanization, the temperature is 150-180°C, and the time is 15-20 minutes.

[0026] The working principle and beneficial effects of the present invention are: In the present invention, the raw material of the sheath layer includes modified nano-silica. The inorganic heat-resistant additive nano-silica is modified by methyl methacrylate-styrene copolymer. On the one hand, the steric hindrance on the surface of the nano-silica can be increased, and its agglomeration tendency can be reduced, so that it can be better dispersed. On the other hand, the methyl methacrylate-styrene copolymer can produce an interactive force with the vinyl in the methyl vinyl silicone rubber, thereby increasing the anchoring effect of the nano-silica inside the sheath layer, thereby giving full play to the heat-resistant enhancement effect of the nano-silica, and then significantly improving the high-temperature resistance of the flat cable sheath layer. DETAILED DESCRIPTION

[0027] 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.

[0028] In the following embodiments and comparative examples, unless otherwise specified, the model of methyl vinyl silicone rubber is 110-4S; the model of EPDM rubber is 3090EM; the model of methyl methacrylate-styrene copolymer is PM-600; the model of polyvinyl butyral is B03-HX; the median particle size of nano-silica is 50 nm; the model of butyl rubber is IIR1953; the model of methyl methacrylate-butadiene-styrene copolymer is TH-21; the model of carbon black is N550; the conductor is a pure copper conductor; and the aluminum wire in the aluminum wire armor layer is a pure aluminum wire with a diameter of 2 mm.

[0029] Example 1 A method for preparing a high temperature resistant flat cable comprises the following steps: S1. Mix 100 parts of methyl vinyl silicone rubber, 40 parts of EPDM rubber, 30 parts of modified nano-silicon dioxide, 4 parts of TP-95, and 1 part of antioxidant MB, then add 3 parts of DCP and mix evenly, extrude, and granulate to obtain a masterbatch of the sheath layer; Among them, during extrusion, the temperature of zone 1 is 140°C, the temperature of zone 2 is 150°C, and the temperature of zone 3 is 130°C; The preparation method of modified nano silicon dioxide comprises the following steps: melting 1 part of methyl methacrylate-styrene copolymer at 200° C., adding 49 parts of nano silicon dioxide, dispersing evenly, cooling, and obtaining modified nano silicon dioxide; S2, wrapping the insulating layer around the outside of the conductor, weaving an aluminum wire armor layer on the outside of the insulating layer, extruding the sheath layer masterbatch on the outside of the aluminum wire armor layer, and vulcanizing at 160° C. for 20 minutes to obtain a flat cable; The preparation method of the insulating layer comprises the following steps: 100 parts of butyl rubber, 15 parts of carbon black and 4 parts of stearic acid are mixed evenly, 3 parts of sulfur and 4 parts of zinc oxide are added and mixed evenly, extruded, and vulcanized at 150° C. for 20 minutes to obtain the insulating layer; During extrusion, the temperature of zone 1 is 130°C, the temperature of zone 2 is 150°C, and the temperature of zone 3 is 120°C.

[0030] Example 2 A method for preparing a high temperature resistant flat cable comprises the following steps: S1, 100 parts of methyl vinyl silicone rubber, 60 parts of EPDM rubber, 40 parts of modified nano-silicon dioxide, 6 parts of TP-95, and 3 parts of antioxidant MB are mixed evenly, and then 5 parts of DCP are added and mixed evenly, extruded, and granulated to obtain a sheath layer masterbatch; Among them, during extrusion, the temperature of zone 1 is 140°C, the temperature of zone 2 is 150°C, and the temperature of zone 3 is 130°C; The preparation method of modified nano silicon dioxide comprises the following steps: melting 1 part of methyl methacrylate-styrene copolymer at 200° C., adding 49 parts of nano silicon dioxide, dispersing evenly, cooling, and obtaining modified nano silicon dioxide; S2, wrapping the insulating layer around the outside of the conductor, weaving an aluminum wire armor layer on the outside of the insulating layer, extruding the sheath layer masterbatch on the outside of the aluminum wire armor layer, and vulcanizing at 180° C. for 15 minutes to obtain a flat cable; The preparation method of the insulating layer comprises the following steps: 100 parts of butyl rubber, 30 parts of carbon black and 8 parts of stearic acid are mixed evenly, and then 5 parts of sulfur and 6 parts of zinc oxide are added and mixed evenly, extruded, and vulcanized at 180° C. for 15 minutes to obtain the insulating layer; During extrusion, the temperature of zone 1 is 130°C, the temperature of zone 2 is 150°C, and the temperature of zone 3 is 120°C.

[0031] Example 3 The only difference between this embodiment and embodiment 2 is that, in this embodiment, when preparing the modified nano-silica, the weight portion of methyl methacrylate-styrene copolymer is 5 parts.

[0032] Example 4 The only difference between this embodiment and embodiment 2 is that in this embodiment, when preparing the modified nano-silica, the weight portion of methyl methacrylate-styrene copolymer is 1.5 parts.

[0033] Example 5 The only difference between this embodiment and embodiment 2 is that, in this embodiment, when preparing the modified nano-silica, the weight portion of methyl methacrylate-styrene copolymer is 3 parts.

[0034] Example 6 The only difference between this embodiment and embodiment 5 is that in this embodiment, the preparation method of modified nano-silica includes the following steps: 2.5 parts of methyl methacrylate-styrene copolymer and 0.5 parts of polyvinyl butyral are mixed evenly and melted at 200°C, 49 parts of nano-silica are added, dispersed evenly, and cooled to obtain modified nano-silica.

[0035] Example 7 The only difference between this embodiment and embodiment 6 is that in this embodiment, the weight portion of methyl methacrylate-styrene copolymer is 2 parts, and the weight portion of polyvinyl butyral is 1 part.

[0036] Comparative Example 1 The difference between this comparative example and Example 1 is that step S1 in this comparative example is: 100 parts of methyl vinyl silicone rubber, 40 parts of EPDM rubber, 0.6 parts of methyl methacrylate-styrene copolymer, 29.4 parts of nano-silicon dioxide, 4 parts of TP-95, and 1 part of antioxidant MB are mixed evenly, and then 3 parts of DCP are added and mixed evenly, extruded, and granulated to obtain a sheath layer masterbatch; During extrusion, the temperature of zone 1 is 140°C, the temperature of zone 2 is 150°C, and the temperature of zone 3 is 130°C.

[0037] Comparative Example 2 The only difference between this comparative example and Example 1 is that in this comparative example, the modified nano-silicon dioxide is replaced by an equal amount of nano-silicon dioxide.

[0038] Comparative Example 3 The only difference between this comparative example and Example 1 is that in this comparative example, the preparation method of modified nano-silica includes the following steps: melting 1 part of polyvinyl butyral at 200° C., adding 49 parts of nano-silica, dispersing evenly, and cooling to obtain modified nano-silica.

[0039] Comparative Example 4 The only difference between this comparative example and Example 1 is that in this comparative example, the preparation method of modified nano-silica includes the following steps: melting 1 part of methyl methacrylate-butadiene-styrene copolymer at 200° C., adding 49 parts of nano-silica, dispersing evenly, and cooling to obtain modified nano-silica.

[0040] The sheath layer of the flat cable in Examples 1 to 7 and Comparative Examples 1 to 4 was stripped, and the tensile strength was measured with reference to GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", wherein the sample was a 1A dumbbell-shaped sample, and the average value of the results of 3 samples was taken as the final result; the test was carried out with reference to GB / T 3512-2014 "Hot air accelerated aging and heat resistance test of vulcanized rubber or thermoplastic rubber", and the tensile strength of each sample after the test was tested according to the above tensile strength test method, and the change rate of the tensile strength was calculated, and the result was retained to two decimal places, wherein, during the test, the cabinet hot air aging box in method A was used, the air was changed 5 times per hour, the temperature was 200°C, and the time was 120h.

[0041] The test results are shown in Table 1 below.

[0042] Table 1 Test results of the sheath properties of the flat cables in Examples 1 to 7 and Comparative Examples 1 to 4

[0043] The comparison between Example 1 and Comparative Examples 1 to 4 shows that the high temperature resistance of the flat cable sheath layer can be significantly improved by modifying the nano silicon dioxide with methyl methacrylate-styrene copolymer. The comparison between Examples 2 to 3 and Examples 4 to 5 shows that when the weight ratio of the modifier to the nano silicon dioxide is 1.5 to 3:49, it helps to further improve the high temperature resistance of the flat cable sheath layer. The comparison between Example 5 and Examples 6 to 7 shows that when the modifier also includes polyvinyl butyral, it helps to further improve the high temperature resistance of the flat cable sheath layer.

[0044] 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 flat cable, characterized in that: It comprises a conductor, an insulating layer is wrapped around the outer side of the conductor, an armor layer is woven on the outer side of the insulating layer, and a sheath layer is extruded on the outer side of the armor layer; The conductor is a copper conductor or an aluminum conductor; The armor layer is an aluminum wire armor layer; The raw materials of the sheath layer include the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 40-60 parts of ternary isopropyl rubber, and 30-40 parts of modified nano-silicon dioxide; The raw materials of the modified nano-silicon dioxide include a modifier and nano-silicon dioxide in a weight ratio of 1 to 5:49; The modifier includes methyl methacrylate-styrene copolymer.

2. A high temperature resistant flat cable according to claim 1, characterized in that: The raw materials of the insulating layer include the following components in parts by weight: 100 parts of butyl rubber, 15-30 parts of carbon black, 4-8 parts of stearic acid, 3-5 parts of sulfur, and 4-6 parts of zinc oxide.

3. A high temperature resistant flat cable according to claim 1, characterized in that: The weight ratio of the modifier to the nano-silicon dioxide is 1.5 to 3:

49.

4. A high temperature resistant flat cable according to claim 1, characterized in that: The modifier further comprises polyvinyl butyral, and the weight ratio of the methyl methacrylate-styrene copolymer to polyvinyl butyral is 10:2-5.

5. A high temperature resistant flat cable according to any one of claims 1 to 4, characterized in that: The preparation method of the modified nano silicon dioxide comprises the following steps: melting the modifier, adding the nano silicon dioxide, dispersing evenly, and cooling to obtain the modified nano silicon dioxide.

6. A high temperature resistant flat cable according to any one of claims 1 to 4, characterized in that: The raw materials of the sheath layer also include 4 to 6 parts of plasticizer, 1 to 3 parts of antioxidant, and 3 to 5 parts of vulcanizer.

7. A high temperature resistant flat cable according to claim 6, characterized in that: The plasticizer includes one or more of TP-95, TOTM, and DBP.

8. A high temperature resistant flat cable according to claim 6, characterized in that: The antioxidant includes one or more of antioxidant 2246, antioxidant 264, and antioxidant MB.

9. A high temperature resistant flat cable according to claim 6, characterized in that: The vulcanizing agent includes one or more of DTBP, DCP and DBPH.

10. The method for preparing a high temperature resistant flat cable according to claim 6, characterized in that: The following steps are involved: S1. Mix the components except the vulcanizing agent in the raw material of the sheath layer uniformly, then add the vulcanizing agent and mix uniformly, extrude, and granulate to obtain a sheath layer masterbatch; S2, wrapping the insulating layer around the outside of the conductor, weaving the armor layer outside the insulating layer, extruding the sheath layer masterbatch around the outside of the armor layer, and vulcanizing to obtain the flat cable.

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