Single-component room-temperature curing insulation coating material and preparation method thereof

Abstract

The invention discloses a single-component room temperature curing insulation coating material and a preparation method thereof. The room temperature curing insulation coating material is prepared from the following ingredients in parts by weight: 80 to 120 parts of 107 silicon rubber, 10 to 50 parts of reinforcing agents, 10 to 30 parts of filling materials, 30 to 60 parts of flame retardants, 1 to 10 parts of surface treating agents, 1 to 2.5 parts of catalysts, 1 to 5 parts of cross-linking agents and 0 to 2 parts of silanol scavenging agents. The room temperature curing insulation coating material provided by the invention has excellent flame retardant property and mechanical property, has extremely high industrial value, and can be widely applied.

Description

Technical Field

[0001] The invention relates to the field of polymer materials and electrical cables, and in particular to a single-component room temperature curing insulating coating material and a preparation method thereof. Background Art

[0002] With the rapid development of industry and economy, power transmission plays a vital role as the infrastructure of modern society. Under the influence of various force majeure, the overhead bare wires of the distribution network transmission lines will cause the bare wires to short-circuit, resulting in various manpower and material losses. Usually, the entire section of bare wires in the section is replaced for maintenance, but this solution has the disadvantages of long construction time, high construction cost, and long power outages during construction, and potential risks also continue to exist.

[0003] Therefore, the new goal is to insulate the transmission lines so that they can be maintained and replaced in the distribution network without power outages. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention proposes a single-component room temperature curing insulating coating and a preparation method thereof, aiming to solve the problem of ground short circuits in conventional power distribution network transmission lines when overhead bare conductors.

[0005] To achieve the above-mentioned purpose, the present invention proposes a one-component room temperature curing insulating coating, wherein the ingredients of the one-component room temperature curing insulating coating are, by weight, 80-120 parts of 107 silicone rubber, 10-50 parts of reinforcing agent, 10-30 parts of filler, 30-60 parts of flame retardant, 1-10 parts of surface treatment agent, 1-2.5 parts of catalyst, 1-5 parts of cross-linking agent, and 0-2 parts of silanol scavenger.

[0006] Optionally, the 107 silicone rubber has at least one of different viscosities such as 5000cSt, 10000cSt, 20000cSt, 50000cSt, 500000cSt, 1000000cSt, etc.

[0007] Optionally, the reinforcing agent is fumed silica.

[0008] Optionally, the filler is at least one of calcium carbonate, silicon powder, titanium dioxide and kaolin.

[0009] Optionally, the flame retardant is a compound of multiple ones of aluminum hydroxide, magnesium hydroxide, zinc borate, diatomaceous earth and mica powder.

[0010] Optionally, the surface treatment agent is at least one of octamethylcyclotetrasiloxane, hydroxy silicone oil, hexamethyldisilazane, and a silane coupling agent.

[0011] Optionally, the catalyst is obtained by combining an organic tin compound, a titanate and a chelate thereof in a ratio of 1:5-1:10.

[0012] Optionally, the crosslinking agent is at least one of tetraethyl orthosilicate, methyltrimethoxysilane and methyltriethoxysilane.

[0013] Optionally, the silanol scavenger is hexamethyldisilazane.

[0014] In order to achieve the above-mentioned purpose, the present invention also proposes a method for preparing a single-component room-temperature curing insulating coating, comprising the following steps: mixing part of 107 silicone rubber, a reinforcing agent, a filler, a flame retardant and a surface treatment agent into a paste in a planetary mixer, increasing the temperature of the planetary mixer for dehydration and drying, cooling in a moisture-proof state, adding a certain mass of a silanol scavenger, and then adding a cross-linking agent and a catalyst in sequence according to the mass ratio for mixing; after mixing, the coating rubber is degassed in a vacuum mixer.

[0015] In order to achieve the above-mentioned purpose, the present invention also proposes a single-component room-temperature curing insulating coating material, which is applied to power transmission lines and includes the above-mentioned single-component room-temperature curing insulating coating material.

[0016] Beneficial effects of the present invention: In the present invention, the one-component room temperature curing insulating coating material synthesized from 107 silicone rubber, reinforcing agent, filler, flame retardant, surface treatment agent, catalyst, etc. is a silicone elastomer material that can be cured at room temperature without heating or pressurization. The typical base rubber is α, ω-dihydroxy polysiloxane, i.e. 107 silicone rubber, which is a condensation type silicone rubber specially used for room temperature vulcanization. It can ensure the curing insulation effect of the present invention at room temperature. The flame retardant is selected with inorganic flame retardant as the main component, which can release water vapor while cooling the transmission line after being heated. The generated metal oxide can form a flame retardant film on the surface of the transmission line, absorbing the smoke particles and harmful gases generated by the combustion of polymer materials. The metal oxide flame retardant does not produce any harmful substances in the entire flame retardant process, which greatly improves the flame retardancy of the material. The single-component room temperature curing insulating coating is cured with free water molecules in the air. It does not sag or drip during the curing process and has the advantages of neither absorbing nor releasing heat. After curing, the material has a low shrinkage rate and excellent adhesion to bare conductors. In addition, it also has excellent electrical insulation properties, chemical stability, aging resistance, moisture resistance and other properties. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0018] Unless defined otherwise, all technical and scientific terms used herein have the common meaning in the art to which the claimed subject matter belongs.

[0019] With the rapid development of industry and economy, power transmission plays a vital role as the infrastructure of modern society. Under the influence of various force majeure, the bare conductors in the distribution network transmission lines are grounded and short-circuited, resulting in various manpower and material losses. Usually, the entire section of bare conductors in this section is replaced for maintenance, but this solution has the disadvantages of long construction time, high construction cost, and long power outages during construction, and potential risks also continue to exist.

[0020] Therefore, the maintenance and replacement of transmission lines in the distribution network without power outages and the insulation transformation of transmission lines have become new goals that can meet the application needs.

[0021] To solve the above problems, the present invention proposes a one-component room temperature curing insulating coating. The ingredients of the one-component room temperature curing insulating coating, measured in parts by weight, include: 80-120 parts of 107 silicone rubber, 10-50 parts of reinforcing agent, 10-30 parts of filler, 30-60 parts of flame retardant, 1-10 parts of surface treatment agent, 1-2.5 parts of catalyst, 1-5 parts of cross-linking agent, and 0-2 parts of silanol scavenger.

[0022] In this scheme, in the present invention, the single-component room-temperature curing insulating coating synthesized from 107 silicone rubber, reinforcing agent, filler, flame retardant, surface treatment agent, catalyst, etc. is a silicone elastomer material that can be cured at room temperature without heating or pressurization. The flame retardant is selected with inorganic flame retardant as the main component. After heating, it can release water vapor while cooling the transmission line. The generated metal oxide can form a flame retardant film on the surface of the transmission line, and can absorb smoke particles and harmful gases generated by the combustion of polymer materials. The metal oxide flame retardant does not produce any harmful substances during the entire flame retardant process, which greatly improves the flame retardancy of the material. The single-component room-temperature curing insulating coating is cured with free water molecules in the air, does not sag or drip during the curing process, and has the advantages of neither absorbing nor releasing heat; after curing, the material has a low shrinkage rate and excellent adhesion to bare conductors. In addition, it also has excellent electrical insulation properties, chemical stability, aging resistance, moisture resistance and other properties.

[0023] In some embodiments, the ingredients of the one-component room temperature curing insulating coating, measured in parts by weight, preferably include: 80-120 parts of 107 silicone rubber, 10-50 parts of reinforcing agent, 10-30 parts of filler, 30-60 parts of flame retardant, 1-10 parts of surface treatment agent, 1-2.5 parts of catalyst, 1-5 parts of cross-linking agent, and 0-2 parts of silanol scavenger.

[0024] Furthermore, the 107 silicone rubber has at least one of different viscosities such as 5000cSt, 10000cSt, 20000cSt, 50000cSt, 500000cSt, and 1000000cSt.

[0025] In some embodiments, 107 silicone rubber is preferably 10000 cSt.

[0026] In some embodiments, the 107 silicone rubber is preferably a combination of 50000 cSt and 500000 cSt.

[0027] Furthermore, the reinforcing agent is fumed silica.

[0028] Furthermore, the filler is at least one of calcium carbonate, silicon powder, titanium dioxide and kaolin.

[0029] In some embodiments, the filler is preferably calcium carbonate.

[0030] In some embodiments, the filler is preferably a mixture of silica powder and titanium dioxide.

[0031] Furthermore, the flame retardant is a compound of multiple types of aluminum hydroxide, magnesium hydroxide, zinc borate, diatomaceous earth and mica powder.

[0032] In some embodiments, the flame retardant is preferably a mixture of aluminum hydroxide and magnesium hydroxide.

[0033] In some embodiments, the flame retardant is preferably diatomaceous earth.

[0034] Furthermore, the surface treatment agent is at least one of octamethylcyclotetrasiloxane, hydroxy silicone oil, hexamethyldisilazane, and a silane coupling agent.

[0035] In some embodiments, the surface treatment agent is preferably a mixture of octamethylcyclotetrasiloxane and hydroxy silicone oil.

[0036] In some embodiments, the surface treatment agent is preferably a silane coupling agent.

[0037] Furthermore, the catalyst is obtained by combining an organic tin compound, a titanate and a chelate thereof in a ratio of 1:5-1:10.

[0038] In some embodiments, the organotin compound is at least one of zinc octoate, zinc neodecanoate, zinc cyclohexane and other organotin compounds, stannous diacetate, stannous dioctoate, stannous dioleate, stannous dilaurate, dibutyltin diacetate, dibutyltin dilaurate, dioctyltin dilaurate, dibutyltin oxide, dibutyltin dichloride and the like.

[0039] In some embodiments, the titanate and its chelate are at least one of tetraisopropoxy titanate, dibutyl titanium dichloride, tetrabutyl titanate, butoxytitanium trichloride, and a titanium chelate complex with at least one of aliphatic diketone, aromatic diketone, and alcohol having 2 to 10 carbon atoms as a ligand.

[0040] In some embodiments, the weight ratio of the organotin compound, titanate and chelate thereof is 1:5-1:10.

[0041] In some embodiments, the weight ratio of the organotin compound, titanate and chelate thereof is 1:7.

[0042] Furthermore, the crosslinking agent is at least one of tetraethyl orthosilicate, methyltrimethoxysilane and methyltriethoxysilane.

[0043] In some embodiments, the crosslinking agent is preferably tetraethyl orthosilicate.

[0044] In some embodiments, the crosslinking agent is preferably a mixture of methyltrimethoxysilane and methyltriethoxysilane.

[0045] Furthermore, the silanol scavenger is hexamethyldisilazane.

[0046] In order to solve the above problems, the present invention also proposes a method for preparing a single-component room temperature curing insulating coating, comprising the following steps:

[0047] S1: base material mixing;

[0048] In this solution, part 107 of the silicone rubber, the reinforcing agent, the filler, the flame retardant and the surface treatment agent are mixed into a paste in a planetary mixer, and the temperature of the planetary mixer is increased to perform dehydration and drying.

[0049] S2: cross-linking to obtain insulating coating material;

[0050] Cool in a moisture-proof environment, add a certain mass of silanol scavenger, and then add a cross-linking agent and a catalyst in sequence according to the mass ratio to react.

[0051] S3: degassing packaging;

[0052] After mixing, the coated rubber material is degassed in a vacuum mixer and then vacuum packaged.

[0053] In order to solve the above problems, the present invention also proposes a conductor insulation coating material, which is applied to power transmission lines and includes the above conductor insulation coating material.

[0054] The content of the present invention is explained below through specific examples and data.

[0055] Embodiment 1:

[0056] The base material is mixed into a paste in a planetary mixer; the temperature of the planetary mixer is increased to 160°C for dehydration and drying for 1 hour; it is cooled to 60°C in a moisture-proof state, a silanol scavenger is added first, and then a cross-linking agent and a catalyst are added in sequence for mixing; after mixing, the coating rubber is degassed in a vacuum mixer and vacuum packaged.

[0057] Among them, the base material is 80 parts of 107 silicone rubber, 15 parts of reinforcing agent, 15 parts of filler, 30 parts of flame retardant and 5 parts of surface treatment agent, in addition, the silanol scavenger is 0.5 parts, the cross-linking agent is 3.5 parts, and the catalyst is 1.2 parts.

[0058] Embodiment 2:

[0059] The preparation method is the same as that of Example 1, except that:

[0060] Among them, the base material is 100 parts of 107 silicone rubber, 25 parts of reinforcing agent, 25 parts of filler, 45 parts of flame retardant and 7 parts of surface treatment agent, in addition, 1 part of silanol scavenger, 4.2 parts of cross-linking agent and 1.6 parts of catalyst.

[0061] Embodiment 3:

[0062] The preparation method is the same as that of Example 1, except that:

[0063] Among them, the base material is 100 parts of 107 silicone rubber, 35 parts of reinforcing agent, 15 parts of filler, 45 parts of flame retardant and 7 parts of surface treatment agent, in addition, 1 part of silanol scavenger, 4.2 parts of cross-linking agent and 1.6 parts of catalyst.

[0064] Embodiment 4:

[0065] The preparation method is the same as that of Example 1, except that:

[0066] Among them, the base material is 120 parts of 107 silicone rubber, 45 parts of reinforcing agent, 25 parts of filler, 50 parts of flame retardant and 10 parts of surface treatment agent, in addition, the silanol scavenger is 2 parts, the cross-linking agent is 5 parts, and the catalyst is 2.3 parts.

[0067] Embodiment 5:

[0068] The preparation method is the same as that of Example 1, except that:

[0069] Among them, the base material is 120 parts of 107 silicone rubber, 50 parts of reinforcing agent, 20 parts of filler, 60 parts of flame retardant and 10 parts of surface treatment agent, in addition, the silanol scavenger is 2 parts, the cross-linking agent is 5 parts, and the catalyst is 2.3 parts.

[0070] Comparative Example 1:

[0071] The preparation method is the same as that of Example 1, except that:

[0072] Among them, the base material is 120 parts of 107 silicone rubber, 50 parts of reinforcing agent, 20 parts of filler and 10 parts of surface treatment agent, in addition, the silanol scavenger is 2 parts, the cross-linking agent is 5 parts, and the catalyst is 2.3 parts.

[0073] Comparative Example 2:

[0074] The preparation method is the same as that of Example 1, except that:

[0075] Among them, the base material is 120 parts of 107 silicone rubber, 50 parts of reinforcing agent, 20 parts of filler, 50 parts of flame retardant and 10 parts of surface treatment agent, in addition, the silanol scavenger is 2 parts, the cross-linking agent is 3.5 parts, and the catalyst is 1.2 parts.

[0076] The components of Examples 1-5 and Comparative Examples 1-2 and important preparation variables are summarized in Table 1.

[0077] Table 1. Summary of components and important preparation variables for Examples 1-5 and Comparative Examples 1-2 of the present invention

[0078]

[0079] According to the test specified in (test standards or specifications to be determined), the single-component room temperature curing insulation coating materials in the above Examples 1-5 and Comparative Examples 1-2 were tested for surface drying time, Shore hardness, tensile strength, elongation at break, tear strength and flame retardancy, and the test results were recorded in the following Table 2:

[0080] Table 2. Performance of Examples 1-5 and Comparative Examples 1-2

[0081]

[0082] According to the above test results, it can be seen that in Examples 1-5, the number of reinforcing agents gradually increases, which are 15 parts, 25 parts, 35 parts, 45 parts and 50 parts respectively, and the Shore hardness of Examples 1-5 also shows a trend of gradually hardening, among which Example 1 has a faster surface drying time, but lower mechanical properties; by adjusting the dosage ratio of 107 silicone rubber, reinforcing agent and filler, a single-component room temperature curing insulating coating with good physical properties like Examples 3 and 4 can be obtained; in Comparative Example 1, no flame retardant is added, and the tensile strength of the obtained insulating coating is 3.20Mpa, the elongation at break is 341%, and the tear strength is 14.2kN / m, which has good performance, but its flame retardant performance is not flame retardant, and it obviously does not have a flame retardant effect; in Comparative Example 2, the dosage of the cross-linking agent and the catalyst is reduced, the surface drying time of the obtained insulating coating is prolonged, and its mechanical properties are also reduced. Therefore, the single-component room-temperature curing insulating coating material has the advantages of neither absorbing nor releasing heat. After curing, the material has a low shrinkage rate and excellent adhesion to bare conductors. In addition, it also has excellent electrical insulation properties, chemical stability, aging resistance, moisture resistance and other properties. It has extremely high industrial value and can be widely used.

[0083] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims

1. A one-component room temperature curing insulating coating, characterized in that: The ingredients of the one-component room temperature curing insulation coating material include, by weight: 107 Silicone rubber 80-120 parts, Reinforcing agent 10-50 parts, 10-30 parts of filler, Flame retardant 30-60 parts, Surface treatment agent 1-10 parts, 1-2.5 parts of catalyst, 1-5 parts of cross-linking agent, 0-2 parts of silanol scavenger.

2. The one-component room temperature curing insulating coating according to claim 1, characterized in that: The 107 silicone rubber has at least one of different viscosities such as 5000cSt, 10000cSt, 20000cSt, 50000cSt, 500000cSt, 1000000cSt.

3. The one-component room temperature curing insulating coating according to claim 1, characterized in that: The reinforcing agent is fumed silica.

4. The one-component room temperature curing insulating coating according to claim 1, characterized in that: The filler is at least one of calcium carbonate, silicon powder, titanium dioxide and kaolin.

5. The one-component room temperature curing insulating coating according to claim 1, characterized in that: The flame retardant is prepared by compounding at least two of aluminum hydroxide, magnesium hydroxide, zinc borate, diatomaceous earth and mica powder.

6. The one-component room temperature curing insulating coating according to claim 1, characterized in that: The surface treatment agent is at least one of octamethylcyclotetrasiloxane, hydroxy silicone oil, hexamethyldisilazane, and a silane coupling agent.

7. The one-component room temperature curing insulating coating material according to claim 1, characterized in that: The catalyst is obtained by combining an organic tin compound, a titanate and a chelate thereof in a ratio of 1:5-1:

10.

8. The one-component room temperature curing insulating coating material according to claim 1, characterized in that: The crosslinking agent is at least one of tetraethyl orthosilicate, methyltrimethoxysilane and methyltriethoxysilane.

9. The one-component room temperature curing insulating coating material according to claim 1, characterized in that: The silanol scavenger is hexamethyldisilazane.

10. The method for preparing a one-component room temperature curing insulating coating according to claim 1, characterized in that: The silicone rubber, reinforcing agent, filler, flame retardant and surface treatment agent of part 107 are mixed into a paste in a planetary mixer, the temperature of the planetary mixer is increased for dehydration and drying, and the mixture is cooled in a moisture-proof state, a certain mass of silanol scavenger is added, and then a cross-linking agent and a catalyst are added in sequence according to the mass ratio for mixing; after mixing, the coated rubber is degassed in a vacuum mixer.

11. A one-component room temperature curing insulating coating, characterized in that: Applied to power transmission lines, the invention comprises the single-component room temperature curing insulating coating material as claimed in any one of claims 1 to 9.

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