CN112961417B - High-flexibility fireproof cable and preparation method thereof - Google Patents

High-flexibility fireproof cable and preparation method thereof Download PDF

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CN112961417B
CN112961417B CN202110058469.0A CN202110058469A CN112961417B CN 112961417 B CN112961417 B CN 112961417B CN 202110058469 A CN202110058469 A CN 202110058469A CN 112961417 B CN112961417 B CN 112961417B
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汤兴豪
郑奥
郑武
蒋环
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Jiangxi Jiangxian Technology Co ltd
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    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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Abstract

The application relates to the technical field of electric wires and cables, and particularly discloses a high-flexibility fireproof cable and a preparation method thereof. The high-flexibility fireproof cable comprises the following components in parts by weight: 200-300 parts of polyethylene; 10-20 parts of silicone oil; 1010-10 parts of antioxidant; 10-20 parts of tricresyl phosphate; 30-40 parts of magnesium hydroxide; 30-40 parts of aluminum hydroxide; 10-20 parts of a silane coupling agent; 40-50 parts of modified ultrahigh molecular weight polyethylene fiber/rubber composite material. The preparation method comprises the following steps: stirring polyethylene, magnesium hydroxide, aluminum hydroxide, a silane coupling agent and a modified ultrahigh molecular weight polyethylene fiber/rubber composite material to obtain a mixture A; adding an antioxidant 1010, tricresyl phosphate and silicone oil, and stirring to obtain a mixture B; and extruding the mixture B for granulation, melting and extruding, coating the mixture B on the surface of the wire rod, and solidifying. The high-flexibility fireproof cable has good flexibility, flame retardance and strength.

Description

High-flexibility fireproof cable and preparation method thereof
Technical Field
The application relates to the technical field of electric wires and cables, in particular to a high-flexibility fireproof cable and a preparation method thereof.
Background
With the development of industries such as petrochemical industry, communication, traffic, building, electric power and the like in China, in recent years, the demand of industries such as power plants, transformer substations, smelting, petrochemical industry and the like on cables is extremely large, and higher requirements are put forward on the performance and the number of the cables, so that materials for manufacturing the cables are gradually upgraded, specialized and specialized. When the cable is applied to drag chains of modern mechanical standard components and environments such as logistics systems, control systems, mechanical automation systems or robots, the cable needs to have good flexibility so as to adapt to frequent bending movement.
In the related art, polyvinyl chloride is often used as a main material of the flexible cable, which not only has good flexibility, but also has the advantages of low price, heat resistance, oil resistance, flame retardance and the like. With the increasing awareness of environmental protection, polyvinyl chloride is replaced by a large amount of "environment-friendly" materials due to the halogen-containing substances, such as: polyethylene resins, and the like.
In view of the above-mentioned related technologies, compared with polyvinyl chloride resin, polyethylene resin is hard, and when it is used as main matrix resin for manufacturing "environment-friendly" flexible cables, the manufactured cables are poor in flexibility and cannot well meet the requirements of practical use.
Disclosure of Invention
In order to improve the flexibility of the environment-friendly cable and simultaneously take the advantages of fire prevention, fire retardation and the like into consideration, the application provides a high-flexibility fireproof cable and a preparation method thereof.
First aspect, this application provides a high flexibility fireproof cable, adopts following technical scheme:
a high-flexibility fireproof cable comprises the following components in parts by weight:
200-300 parts of polyethylene;
10-20 parts of silicone oil;
1010-10 parts of antioxidant;
10-20 parts of tricresyl phosphate;
30-40 parts of magnesium hydroxide;
30-40 parts of aluminum hydroxide;
10-20 parts of a silane coupling agent;
40-50 parts of modified ultrahigh molecular weight polyethylene fiber/rubber composite material;
preferably, the modified ultrahigh molecular weight polyethylene fiber is prepared by the following steps:
a1, preparing potassium dichromate, deionized water and sulfuric acid into a mixed solution;
and A2, adding the ultra-high molecular weight polyethylene fibers into the mixed solution, treating the mixture in an ultrasonic cleaning instrument, cleaning the ultra-high molecular weight polyethylene fibers with deionized water, and drying to obtain the ultra-high molecular weight polyethylene fiber.
By adopting the technical scheme, the polyethylene is used as the main matrix resin, does not contain halogen substances, and is an environment-friendly material; the added silicone oil is used as a lubricant, so that the friction among the raw materials can be reduced, and the processing is convenient; the added antioxidant 1010 can play a role in prolonging the service life of the cable; tricresyl phosphate is used as a plasticizer, so that the friction among molecules can be reduced, and the flexibility and the strength of the cable are improved; the magnesium hydroxide and the aluminum hydroxide are used as flame retardant components, so that the flame retardant property of the cable can be improved; the added silane coupling agent can carry out surface modification on magnesium hydroxide and aluminum hydroxide, so that the magnesium hydroxide and the aluminum hydroxide have good dispersibility in a matrix, and the fire resistance, the flame retardance and the strength of the cable are improved; the added modified ultrahigh molecular weight polyethylene fiber/rubber composite material is used as a main flexibility increasing component, so that the flexibility of the cable can be obviously improved, the surface modification is carried out on the ultrahigh molecular weight polyethylene fiber, the bonding degree between the ultrahigh molecular weight polyethylene fiber and the rubber material can be improved, the prepared composite material has better stability, and the tensile property of the cable is ensured.
The surface modification is carried out on the ultra-high molecular weight polyethylene fiber by using ultrasonic wave and chromic acid solution oxidation composite technology, so that the bonding degree between the treated fiber and the rubber material is improved, the prepared composite material has better stability, and the composite material is added into a matrix, so that a better flexibility increasing effect can be achieved.
Preferably, in the mixed solution, the weight ratio of potassium dichromate, deionized water and sulfuric acid is 1 (1.6-1.8): (20-22).
By adopting the technical scheme, the modification solution is prepared in the range, so that the high molecular weight polyethylene fiber can be fully modified, the surface activity of the high molecular weight polyethylene fiber is improved, and the high molecular weight polyethylene fiber and the rubber material have better adhesion.
Preferably, when the treatment is carried out in the ultrasonic cleaning instrument in A2, the temperature is set to be 30-40 ℃, the treatment time is set to be 3-8min, and the ultrasonic frequency is set to be 90-110kHz.
By adopting the technical scheme, the action mechanism of the ultrasonic wave is as follows: when cavitation occurs, high shearing force is generated in liquid and applied to an object in the liquid, and the surface of the fiber is etched, so that the surface of the fiber is uneven, and the roughness of the surface of the fiber is increased. Within the temperature and time ranges, the cavitation effect is good, and 90-110kHz is the main occurrence frequency of the cavitation reaction.
Preferably, the modified ultrahigh molecular weight polyethylene fiber/rubber composite material is prepared by the following steps: b1, plasticating natural rubber on an open mill, adding an activating agent, an anti-aging agent, dibenzothiazyl disulfide, sulfur and modified ultra-high molecular weight polyethylene fiber, and mixing to obtain a semi-finished product;
and B2, vulcanizing and compounding the semi-finished product on a vulcanizing machine, shearing and cooling to obtain the modified ultrahigh molecular weight polyethylene fiber/rubber composite material.
By adopting the technical scheme, the preparation process is simple, the conditions are controllable, the prepared composite material has the strength of the high molecular weight polyethylene fiber and the toughness of the rubber material, and the high flexibility and the tensile strength of the prepared cable can be improved by adding the composite material into the cable raw material.
Preferably, the activator is prepared from zinc oxide and stearic acid in a weight ratio of 1: (0.3-0.5) mixing.
By adopting the technical scheme, the added activating agent can improve the surface activity of the fiber and rubber materials, so that the synthetic material has better toughness.
Preferably, the anti-aging agent is prepared from anti-aging agent 4010 and anti-aging agent RD in a weight ratio of 1: (1.4-1.6) mixing.
By adopting the technical scheme, the added anti-aging agent can prolong the service life of the composite material, and the anti-aging agent prepared by mixing according to the proportion has a good effect.
Preferably, the weight ratio of the natural rubber, the activating agent, the dibenzothiazyl disulfide, the anti-aging agent, the sulfur and the modified ultrahigh molecular weight polyethylene fiber is 100: (7-8): (1-2): (2-3): (1-2): (5-7).
By adopting the technical scheme, the modified ultrahigh molecular weight polyethylene fiber/rubber composite material has better toughness by adding according to the weight ratio, so that the prepared cable has high flexibility.
Preferably, in the B2, the vulcanization temperature is set to be 140-180 ℃, and the vulcanization time is set to be 10-30min.
By adopting the technical scheme, the vulcanization is more sufficient, the bonding degree between the modified high molecular weight polyethylene fiber and the natural rubber is improved, and the prepared composite material has better thermal stability.
In a second aspect, the present application provides a method for preparing a high-flexibility fireproof cable, which adopts the following technical scheme:
a preparation method of a high-flexibility fireproof cable comprises the following steps:
s1, stirring and mixing polyethylene, magnesium hydroxide, aluminum hydroxide, a silane coupling agent and a modified ultrahigh molecular weight polyethylene fiber/rubber composite material to obtain a mixture A;
s2, adding an antioxidant 1010, tricresyl phosphate and silicone oil into the mixture A, and continuously stirring to obtain a mixture B;
s3, extruding and granulating the mixture B to obtain a cable material;
and S4, melting and extruding the cable material, coating the cable material on the surface of the wire, and cooling and solidifying to obtain the high-flexibility fireproof cable.
By adopting the technical scheme, the preparation method is simple to operate, each condition in the process is easy to regulate and control, the preparation method is suitable for large-scale production, and the produced high-flexibility fireproof cable has good toughness.
Preferably, in the step S3, a twin-screw extruder is used for extrusion granulation, the temperature of the twin-screw extruder is set to be 170-200 ℃, and the screw rotating speed is set to be 150-200rpm.
By adopting the technical scheme, the extrusion temperature and the screw rotating speed within the range are adopted, and the prepared cable material is uniform in quality and good in quality, so that the prepared high-flexibility fireproof cable has good toughness and flame retardant property.
In summary, the present application has the following beneficial effects:
1. according to the cable, the modified ultra-high molecular weight polyethylene fiber/rubber composite material is added to serve as a main softening agent, so that the cable has high flexibility, has the advantages of fire resistance, flame retardance, good tensile property and the like, and overcomes the defect that the polyethylene cable is poor in flexibility compared with a polyvinyl chloride cable;
2. according to the method, the surface of the ultra-high molecular weight polyethylene fiber is modified by combining ultrasonic waves with a chromic acid solution oxidation composite process, so that the roughness of the surface of the fiber is improved, meanwhile, the bonding degree between the fiber and a rubber material after modification treatment is improved, and the stability of the composite material is improved;
3. according to the preparation method, the modified ultrahigh molecular weight polyethylene fiber and the natural rubber are used for preparing the composite material, and the prepared composite material has the toughness of the natural rubber and also has the tensile strength of the ultrahigh molecular weight polyethylene fiber, so that the prepared cable has the advantages of high flexibility and high tensile resistance.
Detailed Description
The present application will be described in further detail with reference to examples.
The polyethylene in the embodiment of the application is collected from the trade company of Wanjinda silk handicraft articles in Shantou city Tinan region display shops;
the silicone oil is obtained from Shanghai Jing mast chemical new materials GmbH;
antioxidant 1010 was obtained from Kyong chemical Co., ltd;
tricresyl phosphate was collected from Zaozhuangrun Xin chemical technology ltd;
the magnesium hydroxide and the aluminum hydroxide are both obtained from Hebei magnesium flourishing chemical technology Co., ltd;
the silane coupling agent is obtained from Nanjing warp weft chemical Co., ltd, and is the silane coupling agent KH-560;
the ultra-high molecular weight polyethylene fiber is collected from Guangdong Tevering New Material application Co., ltd, and has a specification of 2mm-300mm;
the natural rubber is collected from the water-balancing double-force rubber science and technology company;
dibenzothiazyl disulfide was obtained from chemical Co., ltd, NZhaohui, NZhaochi, japan;
the anti-aging agent 4010 and the anti-aging agent RD are both obtained from Shijiazhuang Junsai chemical technology Co.
The twin-screw extruder was taken from Zhang Jia gang Jun Er machinery Co., ltd;
the ultrasonic cleaning instrument is collected from Qingdao Shengji instrument systems, inc., and has the model of P180H.
Preparation examples of raw materials
Preparation example 1: a modified ultra-high molecular weight polyethylene fiber/rubber composite material comprises the following preparation steps:
b1, plasticating the natural rubber on an open mill for 20min, adding an activating agent, an anti-aging agent, dibenzothiazyl disulfide, sulfur and modified ultra-high molecular weight polyethylene fiber, and mixing to obtain a semi-finished product;
and B2, vulcanizing and compounding the semi-finished product for 10min at the temperature of 140 ℃ by using a vulcanizing machine, shearing and cooling to 28 ℃ under the vulcanizing pressure of 18MPa to obtain the modified ultrahigh molecular weight polyethylene fiber/rubber composite material.
Wherein the activating agent is prepared from zinc oxide and stearic acid in a weight ratio of 1:0.3 mixing;
the anti-aging agent is prepared from anti-aging agent 4010 and anti-aging agent RD in a weight ratio of 1:1.4 mixing;
the weight ratio of the natural rubber, the activating agent, the dibenzothiazyl disulfide, the anti-aging agent, the sulfur and the modified ultrahigh molecular weight polyethylene fiber is 100:7:1:2:1:5;
the modified ultra-high molecular weight polyethylene fiber is prepared by the following steps:
a1, preparing a mixed solution from potassium dichromate, deionized water and 70% sulfuric acid according to a weight ratio of 1.6;
and A2, adding the ultra-high molecular weight polyethylene fibers into the mixed solution, placing the mixed solution in an ultrasonic cleaner, treating the mixed solution for 3min at the temperature of 30 ℃, setting the ultrasonic frequency to be 90kHz, then cleaning the ultra-high molecular weight polyethylene fibers for 5 times by using deionized water, and drying the fibers for 1h at the temperature of 50 ℃ to obtain the ultra-high molecular weight polyethylene fiber.
Preparation example 2: a modified ultra-high molecular weight polyethylene fiber/rubber composite material is different from the preparation example 1 in that in the preparation process A1 of the modified ultra-high molecular weight polyethylene fiber, the weight ratio of potassium dichromate, deionized water and 70% sulfuric acid in a mixed solution is 1.7:21.
preparation example 3: a modified ultra-high molecular weight polyethylene fiber/rubber composite material is different from the preparation example 1 in that in the preparation process A1 of the modified ultra-high molecular weight polyethylene fiber, the weight ratio of potassium dichromate, deionized water and 70% sulfuric acid in a mixed solution is 1.8:22.
preparation example 4: a modified ultrahigh molecular weight polyethylene fiber/rubber composite material is different from that of preparation example 1 in that in the preparation process A2 of the modified ultrahigh molecular weight polyethylene fiber, the ultrasonic cleaning temperature is set to 35 ℃, the treatment time is set to 5min, and the ultrasonic frequency is set to 100kHz.
Preparation example 5: a modified ultra-high molecular weight polyethylene fiber/rubber composite material is different from that of preparation example 1 in that in the preparation process A2 of the modified ultra-high molecular weight polyethylene fiber, the temperature of ultrasonic cleaning is set to be 40 ℃, the treatment time is set to be 8min, and the ultrasonic frequency is set to be 110kHz.
Preparation example 6: the difference between the modified ultrahigh molecular weight polyethylene fiber/rubber composite material and the preparation example 1 is that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, an activating agent is prepared from zinc oxide and stearic acid in a weight ratio of 1:0.4 mixing.
Preparation example 7: the difference between the modified ultrahigh molecular weight polyethylene fiber/rubber composite material and the preparation example 1 is that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, an activating agent is prepared from zinc oxide and stearic acid in a weight ratio of 1:0.5 mixing.
Preparation example 8: the difference between the modified ultrahigh molecular weight polyethylene fiber/rubber composite material and the preparation example 1 is that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, an anti-aging agent is prepared from an anti-aging agent 4010 and an anti-aging agent RD in a weight ratio of 1:1.5 mixing.
Preparation example 9: the difference between the modified ultrahigh molecular weight polyethylene fiber/rubber composite material and the preparation example 1 is that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, an anti-aging agent is prepared from an anti-aging agent 4010 and an anti-aging agent RD in a weight ratio of 1:1.6 mixing.
Preparation example 10: the difference between the modified ultrahigh molecular weight polyethylene fiber/rubber composite material and the preparation example 1 is that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, the weight ratio of natural rubber, an activating agent, dibenzothiazyl disulfide, an anti-aging agent, sulfur and modified ultrahigh molecular weight polyethylene fiber is 100:7.5:1.5:2.5:1.5:6.
preparation example 11: the difference between the modified ultrahigh molecular weight polyethylene fiber/rubber composite material and the preparation example 1 is that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, the weight ratio of natural rubber, an activating agent, dibenzothiazyl disulfide, an anti-aging agent, sulfur and modified ultrahigh molecular weight polyethylene fiber is 100:8:2:3:2:7.
preparation example 12: a modified ultrahigh molecular weight polyethylene fiber/rubber composite material is different from the preparation example 1 in that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, the vulcanization temperature is set to be 160 ℃, and the vulcanization time is set to be 20min.
Preparation example 13: a modified ultrahigh molecular weight polyethylene fiber/rubber composite material is different from the preparation example 1 in that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, the vulcanization temperature is set to be 180 ℃, and the vulcanization time is set to be 30min.
Examples
Example 1: a high-flexibility fireproof cable comprises the following components in parts by weight shown in Table 1 and is prepared by the following steps:
s1, putting polyethylene, magnesium hydroxide, aluminum hydroxide, a silane coupling agent and the modified ultrahigh molecular weight polyethylene fiber/rubber composite material prepared in the preparation example 1 into a stirrer, and stirring and mixing for 30min at the rotating speed of 600rpm to obtain a mixture A;
s2, adding an antioxidant 1010, tricresyl phosphate and silicone oil into the mixture A, and continuously stirring for 8min at the rotating speed of 300rpm to obtain a mixture B;
s3, putting the mixture B into a double-screw extruder for extrusion granulation to obtain a cable material, wherein the extrusion temperature of the double-screw extruder is set to 170 ℃,185 ℃,195 ℃,200 ℃,200 ℃ and 200 ℃, and the screw rotation speed is set to 150rpm; and S4, melting and extruding the cable material, coating the cable material on the surface of the wire, and cooling and solidifying to obtain the high-flexibility fireproof cable.
Examples 2 to 6: a highly flexible fire-resistant cable, which is different from example 1 in that each component and the corresponding weight thereof are shown in table 1.
TABLE 1 Components and weights (kg) thereof in examples 1-6
Figure BDA0002901579120000071
Example 7: a highly flexible fireproof cable, which is different from example 1 in that the screw rotation speed of a twin-screw extruder is set to 200rpm in S3 in the preparation process of the highly flexible fireproof cable.
Examples 8 to 19: a high-flexibility fireproof cable, which is different from the embodiment 1 in that modified ultrahigh molecular weight polyethylene fiber/rubber composite materials used in the preparation process of the high-flexibility fireproof cable are prepared in preparation examples 2 to 13 respectively, and the specific correspondence relationship is shown in table 2.
TABLE 2 use comparison table of modified UHMWPE fiber/rubber composite material
Figure BDA0002901579120000072
Figure BDA0002901579120000081
Comparative example
Comparative example 1: a cable, which is different from example 1 in that a modified ultra-high molecular weight polyethylene fiber/rubber composite material is not added in the preparation process of the cable.
Comparative example 2: a cable, which is different from example 1 in that an unmodified ultra-high molecular weight polyethylene fiber/rubber composite material is added in the preparation process of the cable.
Comparative example 3: a cable, which is different from example 1 in that, in the preparation process A1 of the modified ultra-high molecular weight polyethylene fiber, the weight ratio of potassium dichromate, deionized water and 70% sulfuric acid in the mixed solution is 1: 18.
comparative example 4: a cable, which is different from example 1 in that, in the preparation process A1 of the modified ultrahigh molecular weight polyethylene fiber, the weight ratio of potassium dichromate, deionized water and 70% sulfuric acid in the mixed solution is 1: 24.
comparative example 5: a cable, which is different from example 1 in that in the preparation process A2 of the modified ultra-high molecular weight polyethylene fiber, the temperature of ultrasonic cleaning was set to 20 ℃, the treatment time was set to 2min, and the ultrasonic frequency was set to 80kHz.
Comparative example 6: a cable was different from example 1 in that in the preparation process A2 of the modified ultra-high molecular weight polyethylene fiber, the temperature of ultrasonic cleaning was set to 50 ℃, the treatment time was set to 10min, and the ultrasonic frequency was set to 120kHz.
Comparative example 7: a cable, which is different from the cable prepared in example 1 in that, in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, an activating agent is prepared from zinc oxide and stearic acid in a weight ratio of 1:0.2 mixing.
Comparative example 8: a cable, which is different from the cable prepared in example 1 in that, in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, an activating agent is prepared from zinc oxide and stearic acid in a weight ratio of 1:0.6 and mixing.
Comparative example 9: the difference between the cable and the cable in example 1 is that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, the anti-aging agent is prepared from anti-aging agent 4010 and anti-aging agent RD in a weight ratio of 1:1.3 mixing.
Comparative example 10: the difference between the cable and the embodiment 1 is that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, the anti-aging agent is prepared by mixing an anti-aging agent 4010 and an anti-aging agent RD in a weight ratio of 1:1.7 mixing composition.
Comparative example 11: the cable is different from the cable in example 1 in that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, the weight ratio of the natural rubber, the activating agent, the dibenzothiazyl disulfide, the anti-aging agent, the sulfur and the modified ultrahigh molecular weight polyethylene fiber is 100:6:0.8:1:0.8:3.
comparative example 12: the cable is different from the cable prepared in example 1 in that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, the weight ratio of natural rubber, an activating agent, dibenzothiazyl disulfide, an anti-aging agent, sulfur and modified ultrahigh molecular weight polyethylene fiber is 100:9:3:4:3:8.
comparative example 13: a cable was different from that of example 1 in that the vulcanization temperature was set to 100 ℃ and the vulcanization time was set to 5min in the preparation of the modified ultrahigh molecular weight polyethylene fiber/rubber composite.
Comparative example 14: a cable was different from that of example 1 in that the vulcanization temperature was set to 190 ℃ and the vulcanization time was set to 40min in the preparation of the modified ultrahigh molecular weight polyethylene fiber/rubber composite.
Comparative example 15: a cable, which is different from example 1 in that the screw rotation speed of the twin-screw extruder is set to 100rpm in S3 in the preparation process of the high-flexibility fire-resistant cable.
Comparative example 16: a cable, which is different from example 1 in that the screw rotation speed of the twin-screw extruder was set to 300rpm in S3 during the preparation of the high-flexibility fire-resistant cable.
Performance test
10 cables prepared in examples 1 to 19 and comparative examples 1 to 16 were processed into test samples of 5cm length, respectively, and their relative properties were measured, and the average of the test results of each group was taken as the test result of the group.
Testing the tensile property of the sample by adopting the method specified in GB/T1040.1-2018;
testing the flexibility of the electric wire by using a bending tester, wherein the bending frequency is 40 times/min, the electric wire is bent for 30min, and whether creases appear or not is observed;
the test results are reported in table 3 below.
As can be seen from the test data in table 3: the high-flexibility fireproof cables prepared in the embodiments 1 to 19 of the application have no obvious crease after being continuously bent for 1200 times, and the tensile strength is higher than 11.5MPa, which indicates that the high-flexibility fireproof cables have better flexibility and tensile resistance.
By combining the example 1 and the comparative examples 1 and 2, and combining the table 3, it can be seen that the bending strength and the tensile strength of the prepared cable can be significantly improved by adding the modified ultrahigh molecular weight polyethylene fiber/rubber composite material during the preparation of the cable, while the cable prepared by adding the unmodified ultrahigh molecular weight polyethylene fiber/rubber composite material has better flexibility, and has no obvious crease after being continuously bent for 1200 times, but the tensile strength of the cable is reduced to some extent.
In combination with examples 1, 8 and 9 and comparative examples 3 and 4, and in combination with table 3, it can be seen that, in the preparation of modified ultra-high molecular weight polyethylene fiber, the preferred weight ratio of potassium dichromate, deionized water and 70% sulfuric acid in the modified mixed solution is 1 (1.6-1.8): (20-22), under the condition of the weight ratio, the obtained modified ultrahigh molecular weight polyethylene fiber has better tensile resistance, which is reflected in the improvement of tensile strength in a cable.
Combining examples 1, 10, 11 and comparative examples 5, 6, and combining table 3, it can be seen that when preparing the modified ultra-high molecular weight polyethylene fiber, the preferred temperature range of the ultrasonic cleaning apparatus is 30-40 ℃, the preferred treatment time is 3-8min, and the preferred ultrasonic frequency is 90-110kHz, in which range, the ultra-high molecular weight polyethylene fiber is fully modified, so that the surface roughness is significantly improved, and the prepared composite material has better stability.
In combination with examples 1, 12, 13 and comparative examples 7, 8, and in combination with table 3, it can be seen that in the preparation of the modified ultra-high molecular weight polyethylene fiber/rubber composite, the preferred weight ratio of zinc oxide to stearic acid in the activator is 1: (0.3-0.5).
By combining examples 1, 14 and 15 and comparative examples 9 and 10, and combining table 3, it can be seen that when the modified ultrahigh molecular weight polyethylene fiber/rubber composite material is prepared, the preferred weight ratio of the antioxidant 4010 to the antioxidant RD in the antioxidant is 1: (1.4-1.6).
In combination with examples 1, 16 and 17 and comparative examples 11 and 12, and in combination with table 3, it can be seen that in the preparation of the modified ultrahigh molecular weight polyethylene fiber/rubber composite, the preferred weight ratio of the natural rubber, the activator, dibenzothiazyl disulfide, the antioxidant, sulfur and the modified ultrahigh molecular weight polyethylene fiber is 100: (7-8): (1-2): (2-3): (1-2): (5-7), the composite material prepared in the range has better toughness, and the tensile strength of the prepared cable is obviously improved while the prepared cable has better flexibility.
By combining examples 1, 18 and 19 and comparative examples 13 and 14, and by combining table 3, it can be seen that in the preparation process of the modified ultrahigh molecular weight polyethylene fiber/rubber composite material, the preferable setting range of the vulcanization temperature is 140-180 ℃, and the preferable setting range of the vulcanization time is 10-30min, and the composite material prepared under the range has better stability, which is reflected in better tensile resistance and flexibility in a cable.
As can be seen from the combination of examples 1, 7 and 8 and comparative examples 15 and 16, and from Table 3, in the process for producing a cable, the screw rotation speed of the twin-screw extruder is preferably set in the range of 150 to 200rpm, and the cable produced in this range has good flexibility and tensile strength.
TABLE 3 results of Performance testing
Figure BDA0002901579120000111
Figure BDA0002901579120000121
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (3)

1. The high-flexibility fireproof cable is characterized by comprising the following components in parts by weight:
200-300 parts of polyethylene;
10-20 parts of silicone oil;
1010-10 parts of antioxidant;
10-20 parts of tricresyl phosphate;
30-40 parts of magnesium hydroxide;
30-40 parts of aluminum hydroxide;
10-20 parts of a silane coupling agent;
40-50 parts of modified ultrahigh molecular weight polyethylene fiber/rubber composite material;
the modified ultrahigh molecular weight polyethylene fiber is prepared by the following steps:
a1, preparing potassium dichromate, deionized water and sulfuric acid into a mixed solution;
a2, adding the ultra-high molecular weight polyethylene fibers into the mixed solution, treating the mixture in an ultrasonic cleaning instrument, cleaning the ultra-high molecular weight polyethylene fibers with deionized water, and drying to obtain the ultra-high molecular weight polyethylene fiber composite material;
in the mixed solution, the weight ratio of potassium dichromate, deionized water and sulfuric acid is 1 (1.6-1.8): (20-22);
when the A2 is treated in an ultrasonic cleaning instrument, the temperature is set to be 30-40 ℃, the treatment time is set to be 3-8min, and the ultrasonic frequency is set to be 90-110kHz;
the modified ultrahigh molecular weight polyethylene fiber/rubber composite material is prepared by the following steps:
b1, plasticating natural rubber on an open mill, adding an activating agent, an anti-aging agent, dibenzothiazyl disulfide, sulfur and modified ultra-high molecular weight polyethylene fiber, and mixing to obtain a semi-finished product;
b2, vulcanizing and compounding the semi-finished product on a vulcanizing machine, shearing and cooling to obtain the modified ultrahigh molecular weight polyethylene fiber/rubber composite material;
the activating agent is prepared from zinc oxide and stearic acid in a weight ratio of 1: (0.3-0.5) mixing;
the anti-aging agent is prepared from anti-aging agent 4010 and anti-aging agent RD in a weight ratio of 1: (1.4-1.6) mixing;
the weight ratio of the natural rubber, the activating agent, the dibenzothiazyl disulfide, the anti-aging agent, the sulfur and the modified ultrahigh molecular weight polyethylene fiber is 100: (7-8): (1-2): (2-3): (1-2): (5-7);
in the B2, the vulcanization temperature is set to be 140-180 ℃, and the vulcanization time is set to be 10-30min.
2. The method for preparing a highly flexible fireproof cable according to claim 1, comprising the steps of:
s1, stirring and mixing polyethylene, magnesium hydroxide, aluminum hydroxide, a silane coupling agent and a modified ultrahigh molecular weight polyethylene fiber/rubber composite material to obtain a mixture A;
s2, adding the antioxidant 1010, tricresyl phosphate and silicone oil into the mixture A, and continuously stirring to obtain a mixture B;
s3, extruding and granulating the mixture B to obtain a cable material;
and S4, melting and extruding the cable material, coating the cable material on the surface of the wire, and cooling and solidifying to obtain the high-flexibility fireproof cable.
3. The method for preparing a high-flexibility fireproof cable according to claim 2, wherein in S3, a twin-screw extruder is used for extrusion granulation, the temperature of the twin-screw extruder is set to 170-200 ℃, and the screw rotation speed is set to 150-200rpm.
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