CN117089282A

CN117089282A - Anti-cutting coating for cable cladding and preparation method thereof

Info

Publication number: CN117089282A
Application number: CN202310729634.XA
Authority: CN
Inventors: 杨帆; 张攀; 张尖兵; 李芳亚; 熊浩; 罗致; 李晶; 吴优; 孙志; 毛颖堃; 蒋晶晶; 徐晓敏; 孙伟君; 陈涛; 魏忠新; 樊亮; 朱道敏; 胡华志; 徐少峰; 李伟
Original assignee: Xiaogan Power Supply Co of State Grid Hubei Electric Power Co Ltd
Current assignee: Xiaogan Power Supply Co of State Grid Hubei Electric Power Co Ltd
Priority date: 2023-06-20
Filing date: 2023-06-20
Publication date: 2023-11-21

Abstract

The anti-cutting coating for the cable coating and the preparation method thereof comprise the following components in parts by mass: 500-700 parts of dihydroxyl tetra-active hydrogen unsaturated siloxane, 5-10 parts of isocyanic acid, 5-10 parts of tannic acid derivative, 380-490 parts of cross-linking agent, 3000 parts of deionized water, 720-2500 parts of filler and 195-630 parts of reinforcing agent. The coating provided by the invention has excellent heat resistance, cohesiveness, electrical insulation and cutting resistance, and effectively solves the problems of easy breakage and cutting existing in the conventional wire coating.

Description

Anti-cutting coating for cable cladding and preparation method thereof

Technical Field

The invention relates to the technical field of cable coating, in particular to a cutting-resistant coating for cable coating and a preparation method thereof.

Background

Along with the rapid growth of macroscopic economy in China and the rapid improvement of novel urbanization level in the 21 st century, higher requirements are also put forward on the construction of a power distribution network. The existing wire insulation materials such as common polyvinyl chloride and silica gel often have the phenomena of breakage or cutting when facing to extreme natural climate or artificial damage, have larger potential safety hazards and are easy to cause larger loss.

Therefore, there is a need to design a cutting-resistant coating for cable coating and a preparation method thereof to overcome the above problems.

Disclosure of Invention

In order to avoid the problems, the cutting-resistant coating for the cable coating and the preparation method thereof are provided, and the cutting-resistant coating has excellent heat resistance, cohesiveness, electrical insulation and cutting resistance, and effectively solves the problems of easy breakage and cutting existing in the conventional wire coating.

The invention provides a cutting-resistant coating for cable cladding, which comprises the following components in parts by mass: 500-700 parts of dihydroxyl tetra-active hydrogen unsaturated siloxane, 5-10 parts of isocyanic acid, 5-10 parts of tannic acid derivative, 380-490 parts of cross-linking agent, 3000 parts of deionized water, 720-2500 parts of filler and 195-630 parts of reinforcing agent.

Preferably, 600 parts of dihydroxytetra-active hydrogen unsaturated siloxane, 7.5 parts of isocyanic acid, 7.5 parts of tannic acid derivative, 450 parts of cross-linking agent, 3000 parts of deionized water, 1626 parts of filler and 406.5 parts of reinforcing agent.

Preferably, the dihydroxytetra-active hydrogen unsaturated siloxane has a weight average molecular weight of 3500 to 7500 and a structural formula as follows:

the cyclic structure of the dihydroxyl tetra-active hydrogen unsaturated siloxane represents a siloxane chain unit consisting of [ Si ] ₂ O ₄ ]The composition represents a siloxane chain unit in siloxane, OH represents a terminal silicon hydroxyl group of the siloxane, and H represents a terminal silicon hydrogen bond of the siloxane.

Preferably, the isocyanate is 4, 4' -diphenylmethane diisocyanate or toluene diisocyanate.

Preferably, the tannic acid derivative is gallic acid or condensed tannic acid.

Preferably, the cross-linking agent is an amino surface modified aramid nanowire.

Preferably, the filler is one or more of talc or light calcium carbonate.

Preferably, the reinforcing agent is one or more of gas-phase white carbon black and silica micropowder.

The preparation method of the anti-cutting coating for the cable coating comprises the following steps:

(1) Preparation of modified siloxanes: mixing dihydroxyl tetra-active hydrogen unsaturated siloxane, and isocyanic acid in parts by mass, and reacting at 60-80 ℃ for 2-4 hours to obtain modified siloxane;

(2) Emulsification: reacting the obtained modified siloxane for 2-4 hours at 100-120 ℃, cooling to 30-50 ℃, adding a cross-linking agent for cross-linking and end capping to obtain self-emulsifying organic modified polysiloxane, adding deionized water, and emulsifying under the action of high-speed shearing and stirring to obtain self-emulsifying modified organic silicon resin emulsion;

(3) And (3) glue preparation: and adding a filler and a reinforcing agent into the self-emulsifying modified organic silicon resin emulsion, and uniformly mixing to obtain the coating. The obtained anti-cutting coating realizes quick adhesion by heating and pressurizing in the cable line coating process.

Preferably, the method comprises the following steps:

(1) Preparation of modified siloxanes: mixing dihydroxyl tetra-active hydrogen unsaturated siloxane, and isocyanic acid in parts by mass, and reacting at 70 ℃ for 3 hours to obtain modified siloxane;

(2) Emulsification: reacting the obtained modified siloxane for 3 hours at 110 ℃, cooling to 40 ℃, adding a cross-linking agent for cross-linking and end capping to obtain self-emulsifying organic modified polysiloxane, then adding deionized water, and emulsifying under the action of high-speed shearing and stirring to obtain self-emulsifying modified organic silicon resin emulsion;

(3) And (3) glue preparation: and adding a filler and a reinforcing agent into the self-emulsifying modified organic silicon resin emulsion, and uniformly mixing to obtain the coating.

The modification principle of the invention is as follows:

1. the hydroxyl of the dihydroxyl tetra-active hydrogen unsaturated siloxane reacts with isocyanic acid, so that the dihydroxyl tetra-active hydrogen unsaturated siloxane has self-emulsifying capability, the problem that the amino surface modified aramid nanowire is difficult to disperse in an oily system is solved, and a reaction site with the amino surface modified aramid nanowire is provided;

2. the double bond of the dihydroxyl tetra-active hydrogen unsaturated siloxane reacts with the tannic acid derivative to form a three-dimensional cross-linked structure coating film, and the rigidity and the binding force of the silica gel are increased through the multi-ring structure of tannic acid, so that the wear resistance and the cutting resistance of the silica gel are improved;

3. through the isocyanate group reaction of the amino group in the amino surface modified aramid nanowire and the modified silica gel, the interface bonding performance of the aramid nanowire is improved, so that the bonding performance of the aramid nanowire and a rubber matrix is improved, and the composite material is endowed with good anti-cutting characteristics through the composite aramid nanowire.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, through flexible regulation and control of the structure, the types and the content of each component, different requirements of products are met;

2. the invention makes the dihydroxyl tetra-active hydrogen unsaturated siloxane react with the isocyanic acid to have self-emulsifying capability, and improves the problem of slow curing of the traditional silicon coating by regulating the content of the isocyanic acid;

3. according to the invention, the dihydroxy tetra-active hydrogen unsaturated siloxane reacts with tannic acid, and the polycyclic structure is introduced, so that the rigidity of a molecular chain is improved, and meanwhile, the intermolecular acting force is improved, so that the cutting resistance is improved from the angle of the molecular chain;

4. according to the invention, the amino group on the amino modified aramid nano molecular chain reacts with isocyanic acid on the modified silica gel to produce a longer branched chain, a network structure is formed, entanglement during compounding with a matrix material is reduced, so that the aramid nano wire is fully spread in the silica gel, a composite material with a three-dimensional grid structure is established, and the excellent anti-cutting performance of the aramid nano is synergistically improved through the network structure.

Detailed Description

The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Example 1

(1) Preparation of modified siloxanes: 600 parts by mass of dihydroxyl tetra-active hydrogen unsaturated siloxane with the weight average molecular weight of 5500, 7.5 parts by mass of 4, 4' -diphenylmethane diisocyanate and 7.5 parts by mass of gallnut gallic acid are put into a reaction kettle to react for 3 hours at 70 ℃ to obtain modified siloxane;

(2) Emulsification: reacting the modified siloxane in a reaction kettle at 110 ℃ for 3 hours, cooling to 40 ℃, adding 450 parts by mass of cross-linking agent for cross-linking and end capping to obtain self-emulsifying organic modified polysiloxane, then adding 3000 parts by mass of deionized water, and emulsifying for 10 minutes under a high-speed shearing stirrer at a set rotating speed of 1500rpm to obtain self-emulsifying modified organic silicon resin emulsion;

(3) And (3) glue preparation: 1626 parts by mass of talcum powder and 406.5 parts by mass of gas-phase white carbon black are added into the self-emulsifying modified organic silicon resin emulsion, the mixture is uniformly mixed at room temperature, the mixture is stirred for 5 minutes to obtain the coating, and the coating is quickly bonded by heating and pressurizing in the coating process of a cable line.

Example 2

(1) Preparation of modified siloxanes: 600 parts by mass of dihydroxyl tetra-active hydrogen unsaturated siloxane with the weight average molecular weight of 5500, 7.5 parts by mass of 4, 4' -diphenylmethane diisocyanate and 7.5 parts by mass of condensed tannic acid are put into a reaction kettle to react for 3 hours at 70 ℃ to obtain modified siloxane;

Example 3

(1) Preparation of modified siloxanes: 600 parts by mass of dihydroxyl tetra-active hydrogen unsaturated siloxane with the weight average molecular weight of 5500, 7.5 parts by mass of toluene diisocyanate and 7.5 parts by mass of gallnut gallic acid are put into a reaction kettle to react for 4 hours at 60 ℃ to obtain modified siloxane;

(2) Emulsification: reacting the modified siloxane in a reaction kettle at 120 ℃ for 2 hours, cooling to 30 ℃, adding 450 parts by mass of cross-linking agent for cross-linking and end capping to obtain self-emulsifying organic modified polysiloxane, then adding 3000 parts by mass of deionized water, and emulsifying for 10 minutes under a high-speed shearing stirrer at a set rotating speed of 1500rpm to obtain self-emulsifying modified organic silicon resin emulsion;

Example 4

(1) Preparation of modified siloxanes: 700 parts by mass of dihydroxyl tetra-active hydrogen unsaturated siloxane with the weight average molecular weight of 5500, 7.5 parts by mass of toluene diisocyanate and 10 parts by mass of gallnut gallic acid are put into a reaction kettle to react for 2 hours at 80 ℃ to obtain modified siloxane;

(2) Emulsification: reacting the modified siloxane in a reaction kettle at 100 ℃ for 4 hours, cooling to 50 ℃, adding 380 parts by mass of cross-linking agent for cross-linking and end capping to obtain self-emulsifying organic modified polysiloxane, then adding 3000 parts by mass of deionized water, and emulsifying for 10 minutes under a high-speed shearing stirrer at a set rotating speed of 1500rpm to obtain self-emulsifying modified organic silicon resin emulsion;

(3) And (3) glue preparation: 819.5 parts by mass of light calcium carbonate and 409.75 parts by mass of silicon micropowder are added into the self-emulsifying modified organic silicon resin emulsion, the mixture is uniformly mixed at room temperature, the mixture is stirred for 5min to obtain a coating, and the coating is quickly bonded by heating and pressurizing in the cable line coating process.

Example 5

(1) Preparation of modified siloxanes: 500 parts by mass of dihydroxyl tetra-active hydrogen unsaturated siloxane with the weight average molecular weight of 3500, 5 parts by mass of 4, 4' -diphenylmethane diisocyanate and 7.5 parts by mass of gallnut gallic acid are reacted in a reaction kettle at 70 ℃ for 3 hours to obtain modified siloxane;

(2) Emulsification: and (3) reacting the modified siloxane in a reaction kettle at 110 ℃ for 3 hours, cooling to 40 ℃, adding 490 parts by mass of cross-linking agent for cross-linking and end capping to obtain self-emulsifying organic modified polysiloxane, adding 3000 parts by mass of deionized water, and emulsifying for 10 minutes under a high-speed shearing stirrer at a set rotating speed of 1500rpm to obtain the self-emulsifying modified organic silicon resin emulsion.

(3) And (3) glue preparation: 1601 parts by mass of talcum powder and 200.125 parts by mass of silicon micropowder are added into the self-emulsifying modified organic silicon resin emulsion, the mixture is uniformly mixed at room temperature, and the mixture is stirred for 5 minutes to obtain the coating, and the coating is quickly bonded by heating and pressurizing in the coating process of a cable line.

Example 6

(1) Preparation of modified siloxanes: 500 parts by mass of dihydroxyl tetra-active hydrogen unsaturated siloxane with weight average molecular weight of 7500, 5 parts by mass of toluene diisocyanate and 5 parts by mass of gallnut gallic acid are put into a reaction kettle to react for 3 hours at 70 ℃ to obtain modified siloxane;

(3) And (3) glue preparation: 1584 parts by mass of light calcium carbonate and 396 parts by mass of gas-phase white carbon black are added into the self-emulsifying modified organic silicon resin emulsion, uniformly mixed at room temperature, stirred for 5min to obtain the coating, and the coating is quickly bonded by heating and pressurizing in the cable line coating process.

Example 7

(1) Preparation of modified siloxanes: 700 parts by mass of dihydroxyl tetra-active hydrogen unsaturated siloxane with the weight average molecular weight of 3500, 10 parts by mass of 4, 4' -diphenylmethane diisocyanate and 10 parts by mass of gallnut gallic acid are put into a reaction kettle to react for 3 hours at 70 ℃ to obtain modified siloxane;

(2) Emulsification: and (3) reacting the modified siloxane in a reaction kettle at 110 ℃ for 3 hours, cooling to 40 ℃, adding 450 parts by mass of cross-linking agent for cross-linking and end capping to obtain self-emulsifying organic modified polysiloxane, then adding 3000 parts by mass of deionized water, and emulsifying for 10 minutes under a high-speed shearing stirrer at a set rotating speed of 1500rpm to obtain the self-emulsifying modified organic silicon resin emulsion.

(3) And (3) glue preparation: 720 parts by mass of talcum powder and 630 parts by mass of fumed silica are added into the self-emulsifying modified organic silicon resin emulsion, the mixture is uniformly mixed at room temperature, the mixture is stirred for 5 minutes to obtain the coating, and the coating is quickly bonded by heating and pressurizing in the cable line coating process.

Example 8

(1) Preparation of modified siloxanes: 600 parts by mass of dihydroxyl tetra-active hydrogen unsaturated siloxane with the weight average molecular weight of 5500, 10 parts by mass of toluene diisocyanate and 7.5 parts by mass of condensed tannic acid are put into a reaction kettle to react for 3 hours at 70 ℃ to obtain modified siloxane;

(3) And (3) glue preparation: 2500 parts by mass of talcum powder and 195 parts by mass of silicon micropowder are added into the self-emulsifying modified organic silicon resin emulsion, uniformly mixed at room temperature, and stirred for 5min to obtain the coating, and the coating is quickly bonded by heating and pressurizing in the cable line coating process.

Comparative example 1

Unlike example 1, 11 parts by mass of 4, 4' -diphenylmethane diisocyanate and 4 parts by mass of gallic acid; the process conditions were the same as in example 1.

Comparative example 2

Unlike example 1, 4' -diphenylmethane diisocyanate was 4 parts by mass, and gallic acid was 11 parts by mass; the process conditions were the same as in example 1.

Comparative example 3

Unlike example 1, the molecular weight of the dihydroxytetra-active hydrogen unsaturated siloxane was 7600 and the mass part was 490; the process conditions were the same as in example 1.

Comparative example 4

Unlike example 1, the molecular weight of the dihydroxytetra-active hydrogen unsaturated siloxane was 3400 and the mass part was 710; the process conditions were the same as in example 1.

Comparative example 5

Unlike example 1, the fumed silica was 710 parts by mass and the talc was 640 parts by mass; the process conditions were the same as in example 1.

Comparative example 6

Unlike example 1, the fumed silica was 190 parts by mass and the talc was 2600 parts by mass; the process conditions were the same as in example 1.

Comparative example 7

Unlike example 1, the crosslinker is TEA; the process conditions were the same as in example 1.

Comparative example 8

Unlike example 1, the process conditions were that dihydroxytetra-active hydrogen unsaturated siloxane, parts by mass of isocyanic acid, and tannic acid derivatives were mixed and reacted at 50 ℃ for 5 hours, the reaction temperature was too low, and modified siloxane could not be obtained even if the reaction time was prolonged.

Comparative example 9

Unlike example 1, the process conditions were that dihydroxytetra-active hydrogen unsaturated siloxane, parts by mass of isocyanic acid, tannic acid derivatives were mixed and reacted at 90 ℃ for 1 hour, the reaction temperature was too high, the isocyanic acid tended to self-polymerize, the reaction time was too short, the components were not reacted, modified siloxane could not be obtained, and the experiment failed.

Comparative example 10

Unlike example 1, the process conditions were that the modified siloxane obtained above was reacted at 90℃for 5 hours, and the temperature was too low to polymerize the modified siloxane even if the reaction time was prolonged, and the desired modified polysiloxane was obtained, and the experiment failed.

Comparative example 11

Unlike example 1, the process conditions were such that the modified siloxane obtained above was reacted at 130℃for 1 hour, the reaction temperature was too high, explosion polymerization occurred, and the experiment failed.

Comparative example 12

Unlike example 1, the process conditions were reduced to 20℃and the end caps were crosslinked by adding a crosslinking agent

Comparative example 13

Unlike example 1, the process conditions were reduced to 60 ℃, and the end caps were crosslinked by adding a crosslinking agent.

Test

Coatings were prepared according to the above examples and comparative examples, applied to the cable wire coating as required, and subjected to relevant test experiments, the results of which are shown in tables 1 and 2 below; unless specifically emphasized, the parts are parts by weight, and the material measurement is carried out under the test conditions of 25+/-1 ℃ and 40+/-5% relative humidity:

1. density is measured according to ISO1183, expressed in g/cm;

2. the surface dry time is measured according to GB/T13477.5 and is expressed in min;

3. the curing speed is measured according to GB/T32369 and is expressed in mm/24 h;

4. hardness is measured according to GB/T39693.9 and is expressed in Shore A;

5. tensile strength and elongation at break are measured according to GB/T1040.1-2018, and are expressed by N/cm,% respectively;

6. dielectric strength was measured according to GB/T31838.6 and expressed in kV/mm;

7. shear strength is measured according to GB/T30969 and expressed in Mpa;

8. the flame retardance is measured according to GB/T8333 to determine the vertical burning flame retardant level;

9. the high-temperature aging tensile strength and the elongation at break are measured by a tensile testing machine according to GB/T1040.1-2018 after aging for 168 hours according to GB/T11026.1 and 100 ℃, and the tensile strength and the elongation at break after aging are expressed by N/cm;

10. the dielectric strength of the high-temperature aging is measured according to GB/T31838.6 by using a high-temperature aging box after aging for 168 hours at 100 ℃ according to GB/T11026.1, and the dielectric strength is expressed by kV/mm;

11. the low-temperature aging tensile strength and the elongation at break are measured by a tensile testing machine according to GB/T1040.1-2018 after aging according to GB/T2423.1 and aging for 168 hours at-50 ℃, and the tensile strength and the elongation at break after aging are expressed by N/cm;

12. the dielectric strength of the low-temperature aging is measured according to GB/T31838.6 by using a low-temperature aging box after aging according to GB/T2423.1 and 168 hours at-50 ℃, and the dielectric strength is expressed by kV/mm;

the UV ageing tensile strength and the elongation at break are measured by a tensile testing machine according to GB/T1040.1 after ageing for 21 days according to GBT16422.2 by using an ultraviolet ageing oven, and the tensile strength and the elongation at break are expressed by N/cm;

UV aged dielectric strength was measured according to GB/T31838.6 using an ultraviolet ageing oven, according to GBT16422.2, after 21 days ageing, expressed in kV/mm;

15. the breakdown voltage is measured according to ASTMD 1000, and the value is the highest value of the voltage which can be born by the sample in one minute;

16. breakdown voltage after soaking, sampling, soaking in water for 48h, and measuring according to ASTMD 1000, wherein the value is the highest value of the voltage which can be born by the sample in one minute;

17. the water contact angle is measured according to GB/T30693 and is expressed in degrees;

18. storage stability the storage stability was characterized by the presence or absence, softness and hardness according to the GB/T6753.3 paint storage stability test method.

19. The cut resistance was measured according to EN388 and was given as cut rating.

TABLE 1 EXAMPLES Performance Table

TABLE 2 comparative example Performance Table

From the test results of tables 1 and 2, the following conclusions were drawn:

(1) The paint provided in the examples 1-8 has better mechanical and flame-retardant properties while meeting the performance requirements of adhesive force, elasticity, dielectric loss and the like, has breakdown voltage of 40kV/mm and cut-proof grade of more than 3, has mechanical property reduced by less than 35% after high-temperature, low-temperature and UV aging, and can meet the use requirements, and the service life of more than 10 years. Example 1 is a preferred example of the present invention relative to other examples, and the best performance is achieved by flexible control of the structure, type and content of each component.

(2) Comparative example 1 was compared with example 1 in that 11 parts of 4,4 '-diphenylmethane diisocyanate, 4 parts of gallic acid and 7.5 parts of 4, 4' -diphenylmethane diisocyanate and 7.5 parts of gallic acid were used in comparative example 1; by regulating and controlling the contents of 4,4 '-diphenylmethane diisocyanate and gallnut gallic acid, the problems of brittleness, intolerance to low temperature and poor cutting prevention caused by too much 4, 4' -diphenylmethane diisocyanate and too little gallnut gallic acid are solved.

(3) Comparative example 2 was compared with example 1 in that 4 parts of 4,4 '-diphenylmethane diisocyanate, 11 parts of gallic acid and 7.5 parts of 4, 4' -diphenylmethane diisocyanate and 7.5 parts of gallic acid were used in comparative example 2; by regulating and controlling the contents of 4,4 '-diphenylmethane diisocyanate and gallnut gallic acid, the problems of slow solidification, high hardness and intolerance to low temperature caused by too little 4, 4' -diphenylmethane diisocyanate and too much gallnut gallic acid are solved.

(4) Comparative example 3 was compared with example 1 in that the molecular weight of the dihydroxytetra-active hydrogen unsaturated siloxane in comparative example 3 was 7600 and the mass part was 490, and the molecular weight of the dihydroxytetra-active hydrogen unsaturated siloxane in example 1 was 5500 and the mass part was 600; the problem of poor processability when the molecular weight of the alpha, omega-hydroxyl-terminated vinyl dimethoxy polydimethylsiloxane is overlarge is solved by regulating and controlling the molecular weight of the hydroxyl tetra-active hydrogen unsaturated siloxane; the problems of different inner and outer layer polymer contents, different curing rates and too small tensile strength and shearing strength caused by too low content are solved by regulating and controlling the content of alpha, omega-hydroxyl-terminated vinyl dimethoxy polydimethylsiloxane.

(5) Comparative example 4 was compared with example 1 in that the molecular weight of the dihydroxytetra-active hydrogen unsaturated siloxane in comparative example 4 was 3400 and the mass fraction was 710, and the molecular weight of the dihydroxytetra-active hydrogen unsaturated siloxane in example 1 was 5500 and the mass fraction was 600; the problem of poor mechanical properties when the molecular weight of alpha, omega-hydroxyl-terminated vinyl dimethoxy polydimethylsiloxane is too small is solved by regulating and controlling the molecular weight of the dihydroxyl tetra-active hydrogen unsaturated siloxane; the problems of slow solidification and poor stability caused by too high content are solved by regulating and controlling the content of alpha, omega-hydroxyl-terminated vinyl dimethoxy polydimethylsiloxane.

(7) Comparative example 5 was compared with example 1, in comparative example 5, 710 parts of fumed silica and 640 parts of talc, and in example 1, 406.5 parts of fumed silica and 1626 parts of talc; by regulating and controlling the content of talcum powder, the problems of excessive filling and poor mechanical property when the talcum powder is excessive are solved; by regulating and controlling the content of the reinforcing agent, the problems of too little reinforcing agent and poor tensile property are solved.

(8) Comparative example 6 was compared with example 1, wherein 190 parts of fumed silica and 2600 parts of talc were used in comparative example 6, and 406.5 parts of fumed silica and 1626 parts of talc were used in example 1; the problem of surface hairiness caused by too little talcum powder is solved by regulating and controlling the talcum powder content; by regulating and controlling the content of the reinforcing agent, the problem of poor mechanical properties caused by excessive reinforcing agent is solved.

(9) Comparative example 7 was compared with example 1 in that the cross-linking agent in comparative example 7 was TEA and in example 1 was an aminated aramid nanowire; the defect that the conventional product has no cutting resistance is overcome by regulating and controlling the cross-linking agent.

(10) Comparative example 12 and example 1 were compared, the process conditions of comparative example were reduced to 20 ℃, cross-linking termination was performed by adding cross-linking agent, and the process conditions of example 1 were reduced to 40 ℃, cross-linking termination was performed by adding cross-linking agent. By regulating and controlling the end-capping temperature of the cross-linking agent, the problem of low cutting resistance caused by poor effect of cross-linking the aminated aramid nanowire when the temperature is too low is solved.

(11) Comparative example 13 and example 1 were compared, the process conditions of comparative example were reduced to 60 ℃, cross-linking termination was performed by adding cross-linking agent, and the process conditions of example 1 were reduced to 40 ℃, cross-linking termination was performed by adding cross-linking agent. By regulating and controlling the end-capping temperature of the cross-linking agent, the problems of high hardness and suddenly reduced stretching rate caused by high cross-linking density when the temperature is too high are solved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. The cutting-resistant coating for the cable coating is characterized by comprising the following components in parts by weight: 500-700 parts of dihydroxyl tetra-active hydrogen unsaturated siloxane, 5-10 parts of isocyanic acid, 5-10 parts of tannic acid derivative, 380-490 parts of cross-linking agent, 3000 parts of deionized water, 720-2500 parts of filler and 195-630 parts of reinforcing agent.

2. The cut-preventing coating for cable coating as claimed in claim 1, comprising, in parts by mass: 600 parts of dihydroxytetra-active hydrogen unsaturated siloxane, 7.5 parts of isocyanic acid, 7.5 parts of tannic acid derivative, 450 parts of cross-linking agent, 3000 parts of deionized water, 1626 parts of filler and 406.5 parts of reinforcing agent.

3. The cut-preventing coating for cable coating as recited in claim 1, wherein: the weight average molecular weight of the dihydroxytetra-active hydrogen unsaturated siloxane is 3500-7500.

4. The cut-preventing coating for cable coating as recited in claim 1, wherein: the isocyanate is 4, 4' -diphenylmethane diisocyanate or toluene diisocyanate.

5. The cut-preventing coating for cable coating as recited in claim 1, wherein: the tannic acid derivative is Galla chinensis gallic acid or condensed tannic acid.

6. The cut-preventing coating for cable coating as recited in claim 1, wherein: the cross-linking agent is an amino surface modified aramid nanowire.

7. The cut-preventing coating for cable coating as recited in claim 1, wherein: the filler is one or more of talcum powder and light calcium carbonate.

8. The cut-preventing coating for cable coating as recited in claim 1, wherein: the reinforcing agent is one or more of gas phase white carbon black and silicon micropowder.

9. A method for preparing the cut-preventing coating for cable coating according to any one of claims 1 to 8, comprising the steps of:

10. The method for preparing the cut-preventing coating for cable coating as recited in claim 9, comprising the steps of: