CN111019516B - Light self-curing electric power insulation coating material, preparation method and power line - Google Patents
Light self-curing electric power insulation coating material, preparation method and power line Download PDFInfo
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Abstract
The invention relates to a light self-curing electric power insulation coating material, a preparation method and a power line, which comprise 50-80 parts by weight of modified organic silicon resin, 5-7 parts by weight of plasticizer, 1-4 parts by weight of cross-linking agent, 0.1-3 parts by weight of titanate chelate, 1-8 parts by weight of hydrophobic fumed silica, 10-30 parts by weight of nano hollow microspheres, 0.2-2 parts by weight of moisture scavenger, 0.5-2 parts by weight of super wear-resistant carbon black, 1-3 parts by weight of adhesion promoter and 0-1 part by weight of mildew preventive; the modified organic silicon resin contains at least 2 alkoxy functional groups, and the number average molecular weight of the modified organic silicon resin is 70000-120000. The insulating coating material has light weight and the density of only 0.9-1.0 g/cm3The stress load of the original tower pole can not be excessively increased, and the lead can not sag.
Description
Technical Field
The invention relates to a light self-curing electric power insulation coating material, a preparation method and a power line.
Background
In the early outdoor overhead power line, a bare aluminum wire form is generally adopted due to the consideration of cost and heat dissipation, and simultaneously, in order to increase tensile resistance, a steel wire is doped in the middle, which is commonly called as a steel-cored aluminum stranded wire. Because of lack of protection of the insulating sheath, the lead is easy to oxidize and rust in the long-term exposure to the sun and rain, and meanwhile, serious potential safety hazards such as interphase short circuit, leakage/electric shock and the like can exist; and the increase of insulating crust inevitably can lead to the power line quality increase, leads to the increase of electric rack weight load, has increaseed the transformation degree of difficulty. For many years, insulation transformation of power distribution overhead lines, local insulation treatment of bare wires in adjacent spaces such as house trees, bridges, tunnels and the like are one of the difficult problems of power grid transformation and operation and maintenance. Heretofore, to address such problems, it has been common to rely purely on manual replacement of new insulated wires. However, due to the geographical location, the original tower loading, the power outage duration, and other factors, a considerable area is difficult to implement.
Chinese patent specification CN109021578A discloses a novel insulating material for coating on an overhead bare wire and a preparation method thereof, which can better realize the insulation treatment of the bare wire. The material takes vinyl hydrogen-containing silane as a resin matrix, but the resin is easy to perform addition polymerization with a silicon-hydrogen bond under the action of a platinum catalyst coexisting with the resin, so that the material has the potential risk of being cured before use, has short shelf life and is generally only suitable for being prepared at present, and meanwhile, ketoxime micromolecules removed by a cross-linking agent in the reaction process can generate chemical corrosion on a copper-aluminum wire.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a light self-curing electric insulating coating material and a preparation method thereof; the second purpose is to provide a power line.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a light self-curing electric insulation coating material comprises, by weight, 50-80 parts of modified organic silicon resin, 5-7 parts of a plasticizer, 1-4 parts of a cross-linking agent, 0.1-3 parts of a titanate chelate, 1-8 parts of hydrophobic fumed silica, 10-30 parts of nano hollow microspheres, 0.2-2 parts of a moisture scavenger, 0.5-2 parts of super wear-resistant carbon black, 1-3 parts of an adhesion promoter and 0-1 part of a mildew inhibitor; the modified organic silicon resin contains at least 2 alkoxy functional groups, and the number average molecular weight of the modified organic silicon resin is 70000-120000.
Further, the light self-curing electric insulating coating material comprises, by weight, 55-75 parts of modified organic silicon resin, 5.5-6.5 parts of plasticizer, 2-3 parts of cross-linking agent, 0.5-2.5 parts of titanate chelate, 2-6 parts of hydrophobic fumed silica, 12-28 parts of nano hollow microspheres, 0.5-1.5 parts of moisture scavenger, 0.8-1.6 parts of super wear-resistant carbon black, 1.5-2.5 parts of adhesion promoter and 0.4-0.8 part of mildew preventive.
Further, the modified organic silicon resin is prepared by the reaction and polycondensation of alpha, omega dihydroxy organic silica gel and trifunctional and/or tetrafunctional alkoxy silane under the action of a mixed catalyst of ketoxime, secondary amine and carboxylic acid, and the alpha, omega dihydroxy organic silica gel is terminated. Typically, the α, ω dihydroxy organic silica gel is a commercially available α, ω dihydroxy organic silica gel.
Still further, the alkoxy group is one or more of methoxy, ethoxy, propoxy and isopropoxy, preferably methoxy.
Further, the number average molecular weight of the modified organic silicon resin is 60000-100000.
Further, the titanate chelate is a chelate of one or more of n-butyl titanate, tert-butyl titanate, isopropyl titanate and n-propyl titanate with one or more of acetylacetone, ethyl acetoacetate and diethanolamine, and preferably a chelate of isopropyl titanate and ethyl acetoacetate.
Furthermore, the sphericity of the nano hollow microspheres is more than 95%, and the true density is 0.2-0.5 g/cm3The antistatic pressure is 10-40 Mpa, and the median particle diameter D50Between 20 um and 60 um.
Further, the nano hollow microspheres are one or more of silicon carbide hollow microspheres, corundum hollow microspheres, cerium oxide hollow microspheres, zirconium oxide hollow microspheres, glass hollow microspheres and ceramic hollow microspheres, and preferably are glass hollow microspheres.
Further, the plasticizer is a silicone oil plasticizer.
Still further, the plasticizer is dimethicone.
Further, the mildew preventive is chlorothalonil or carbendazim.
Further, the moisture scavenger is one or a mixture of more of superfine anhydrous calcium chloride and hexamethyldisilazane.
Further, the crosslinking agent is an alkoxy silicone crosslinking agent, such as methyltrimethoxysilane.
The preparation method of the light self-curing electric insulating coating material comprises the following steps:
s1, uniformly mixing the modified organic silicon resin, the plasticizer, the hydrophobic fumed silica, the mildew preventive and the super wear-resistant carbon black to obtain a mixture A;
s2, uniformly mixing the mixture A and the nano hollow glass microspheres to obtain a mixture B;
s3, drying the mixture B, removing water vapor in the mixture B, dripping a liquid mixture into the mixture B, and mixing to obtain a daub-shaped light self-curing electric insulation coating material finished product;
wherein the liquid mixture is prepared by mixing a moisture scavenger, an accelerant, a cross-linking agent and a titanate chelate.
An electric power line comprising a body made of a conductive metal material, the surface of the body having an insulating layer made of the light self-curing electric power insulating coating material as described above or the light self-curing electric power insulating coating material prepared by the preparation method as described above.
Further, the thickness of the insulating layer is 2-3 mm.
The light self-curing electric insulation coating material is a single-component moisture-curing paste, is light in weight and has the density of only 0.9-1.0 g/cm3The one-time coating thickness of the bare conductor can reach 2-3 mm, the bare conductor does not sag in a suspended state, the stress load of the original tower pole cannot be excessively increased, and the conductor cannot sag.
Compared with the prior art, the invention has the following beneficial effects:
1. the insulating coating material can easily realize the live insulating treatment of bare conductors by means of the existing coating equipment, and has higher applicability compared with the existing large-range power failure operation; not only can shorten the transformation time of the power distribution network, but also can greatly reduce the manual operation intensity and the economic cost caused by power failure.
2. The insulating coating material is a single-component paste, is 100 percent solid, does not need to undergo other preparation links such as glue preparation, material mixing and the like, does not need an external curing agent, can be directly used, and is simple, convenient and quick to operate.
3. The insulating coating material is light in weight and only has the density of 0.9-1.0 g/cm by matching with the reasonable selection and matching of the nano hollow microspheres and other components3Lower than the traditional paint or sealant products, and materials for insulating sheath such as polyvinyl chloride, ethylene propylene rubber and the like (the density is mostly more than 1.1 g/cm)3) Therefore, the stress load of the original tower pole cannot be excessively increased, and the lead cannot sag.
4. The insulating coating material has reasonable viscosity and thixotropy control, ensures good construction spreadability, prevents material waste caused by sagging and glue dripping, can be coated on a bare conductor by 2-3 mm at one time, and has stable shape in a suspended state.
5. The insulating coating material disclosed by the invention effectively avoids the viscosity peak problem easily caused by difficulty in control of a polycondensation reaction between the conventional alpha, omega dihydroxy organic silica gel and the conventional titanate catalyst in a mixing process by selecting the special modified organic silicon resin and matching the titanate chelate, improves the feasibility of product preparation and reduces the requirements on production equipment.
Drawings
Fig. 1 is a diagram showing the effect of the insulating coating material of the present invention coated on a bare aluminum wire and cured.
Fig. 2 is a graph showing the effect of applying the insulating coating material on the bare aluminum wire in comparative example 1.
Fig. 3 is a graph showing the effect of applying the insulating coating material on the bare aluminum wire in comparative example 2.
Detailed Description
The present invention is further illustrated by the following examples, but the scope of the present invention is not limited to the following examples.
Example 1
The preparation method of the insulating coating material of this example is as follows:
according to weight, 65 parts of alpha, omega dimethoxy modified organosilicon resin with the average molecular weight of 80000, 6 parts of dimethyl silicone oil, 7 parts of hydrophobic fumed silica, 0.5 part of chlorothalonil and 0.8 part of super wear-resistant carbon black are fully and uniformly dispersed by a three-roll grinder, transferred to a planetary double-power mixer, and simultaneously added with 20 parts of 97 percent of sphericity, 12MPa of antistatic pressure, 60um of median particle size and 0.20g/cm of true density3The nano hollow glass microsphere is prepared by completely removing water vapor in materials under the vacuum heating and stirring environment, slowly dripping a liquid mixture consisting of 0.4 part of hexamethyldisilazane, 1.5 parts of aminopropyltrimethoxysilane, 3 parts of methyltrimethoxysilane cross-linking agent and 1 part of diisopropyl bis (ethyl acetoacetate) titanate into the nano hollow glass microsphere, and pouring the mixture into a special ABS closed tank by a glue pressing machine for standby after all the raw materials are mixed into a completely uniform daub shape.
The detection shows that the mixing process of the daub is normal, and the final product is pasty and dark black and has the density of 0.92g/cm3The construction spreadability is good, the bare aluminum wire is coated with a thickness of 3mm at one time, does not sag in a suspended state, and can be dried in 35min after being directly exposed in the air. The tensile strength of a cured product is 2.0Mpa, the adhesion to the aluminum material is 22N/cm, the electric breakdown strength is 19.8kV/mm, and the strength is not obviously changed after the UV aging resistance is 1000 hours.
Example 2
The preparation method of the insulating coating material of this example is as follows:
according to weight, after 75 parts of alpha, omega dimethoxy modified organic silicon resin with the average molecular weight of 100000, 7 parts of dimethyl silicone oil, 5 parts of hydrophobic fumed silica, 1 part of carbendazim and 0.4 part of super wear-resistant carbon black are fully and uniformly dispersed by a three-roll grinder, the mixture is transferred to a planetary double-power mixer, and 22 parts of 95 percent of sphericity degree, 30Mpa of antistatic pressure, 45um of median particle size and 0.49g/cm of true density are added simultaneously3The nano hollow glass microspheres are heated and stirred in vacuumCompletely removing water vapor in the materials, slowly dripping a mixture consisting of 0.5 part of superfine anhydrous calcium chloride, 1 part of glycidyl ether propyl triethyl silane, 2 parts of methyl trimethoxy silicon cross-linking agent and 0.7 part of diisopropyl bis (ethyl acetoacetate) titanate, mixing all the raw materials into a completely uniform cement shape, and pouring the mixture into a special ABS closed tank by a rubber press for later use.
The detection shows that the mixing process of the daub is normal, and the final product is pasty and gray black and has the density of 0.987g/cm3The construction spreadability is good, the bare aluminum wire is coated with a thickness of 2mm at one time, does not sag in a suspended state, and can be dried within 50min after being directly exposed in the air. The tensile strength of a cured product is 1.8Mpa, the adhesion to aluminum material is 18N/cm, the electric breakdown strength is 20kV/mm, and the strength is not obviously changed after the UV aging resistance is 1000 h.
Comparative example 1
The preparation method of the insulating coating material of this comparative example was as follows:
according to weight, 65 parts of alpha, omega dihydroxy organic silicon resin with the average molecular weight of 80000, 6 parts of dimethyl silicone oil, 10 parts of hydrophobic fumed silica, 1 part of carbendazim and 0.4 part of super wear-resistant carbon black are fully and uniformly dispersed by a three-roll grinder, transferred to a planetary double-power mixer, and simultaneously added with 27 parts of 95 percent of sphericity degree, 120MPa of antistatic pressure, 30um of median particle size and 0.6g/cm of true density3The nano hollow glass microsphere is prepared by completely removing water vapor in materials under the vacuum heating and stirring environment, slowly dripping a liquid mixture consisting of 0.5 part of hexamethyldisilazane, 1 part of glycidyl ether propyl triethylsilane, 2 parts of methyltrimethoxy silicon cross-linking agent and 1 part of n-butyl titanate, and pouring the mixture into a special ABS closed tank by a glue press after all the raw materials are mixed into a completely uniform daub shape for later use.
Through detection, the daub has a viscosity peak after the n-butyl titanate catalyst is dripped, so that the power of the planetary double-power mixer is overloaded, the stirring is suspended for one time, and the final product is in the form of high-viscosity paste, gray black and has the density of 1.07g/cm3The bare aluminum wire has no sagging when being coated with a thickness of 3.5mm in one time and suspended, but has low application property and is not easy to spread (see figure 2). CuringThe product is resistant to UV aging for 1000h, and then the color turns yellow and the strength is lost by 8%.
Comparative example 2
The preparation method of the insulating coating material of this comparative example was as follows:
according to weight, 70 parts of alpha, omega dihydroxy organic silicon resin with the average molecular weight of 100000, 7 parts of dimethyl silicone oil, 4 parts of hydrophobic fumed silica, 1 part of chlorothalonil and 0.5 part of super wear-resistant carbon black are fully and uniformly dispersed by a three-roll grinder, transferred to a planetary double-power mixer, and simultaneously added with 15 parts of 97 percent of sphericity, 5MPa of antistatic pressure, 70um of median particle size and 0.17g/cm of true density3The nano hollow glass microsphere is prepared by completely removing water vapor in materials under the vacuum heating and stirring environment, slowly dripping a mixture consisting of 0.5 part of superfine anhydrous calcium chloride, 1 part of glycidyl ether propyl triethyl silane, 2 parts of methyl trimethoxy silicon cross-linking agent and 1 part of n-butyl titanate, and pouring the mixture into a special ABS closed tank by a glue press after all raw materials are mixed into a completely uniform daub shape for later use.
Through detection, the daub has a viscosity peak after the n-butyl titanate catalyst is dripped, so that the power of the planetary double-power mixer is overloaded, the stirring is stopped once, the viscosity is gradually reduced after 4 hours, and the final product is in the shape of low-viscosity paste and gray black, and has the density of only 0.87g/cm3The bare aluminum wire has good application property and is easy to spread, but the bare aluminum wire has serious sagging when being coated with 1.2mm thick suspension at one time (see figure 3). The cured product is yellow after resisting UV aging for 1000h, and the strength loss is 10%.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (9)
1. A light self-curing electric insulation coating material for bare conductors is characterized by comprising, by weight, 65-75 parts of alpha, omega-dimethoxy modified organic silicon resin, 5-7 parts of plasticizer and 1-E cross-linking agent4 parts of titanate chelate 0.1-3 parts, hydrophobic fumed silica 5-7 parts, nano hollow microspheres 20-30 parts, water scavenger 0.2-2 parts, super wear-resistant carbon black 0.5-2 parts, adhesion promoter 1-3 parts and mildew preventive 0-1 part; the number average molecular weight of the modified organic silicon resin is 80000-100000; the sphericity of the nano hollow microspheres is more than 95%, and the true density is 0.2-0.5 g/cm3The antistatic pressure is 10-40 Mpa, and the median particle diameter D50Is between 20 and 60 μm.
2. The light self-curing electric insulation coating material as recited in claim 1, wherein the light self-curing electric insulation coating material comprises, by weight, 65-75 parts of alpha, omega-dimethoxy modified silicone resin, 5.5-6.5 parts of plasticizer, 2-3 parts of cross-linking agent, 0.5-2.5 parts of titanate chelate, 5-6 parts of hydrophobic fumed silica, 20-28 parts of nano hollow microspheres, 0.5-1.5 parts of moisture scavenger, 0.8-1.6 parts of super wear-resistant carbon black, 1.5-2.5 parts of adhesion promoter and 0.4-0.8 part of mildew preventive.
3. The light self-curing electric insulation coating material according to claim 1, characterized in that the titanate chelate is a chelate of one or more of n-butyl titanate, t-butyl titanate, isopropyl titanate, n-propyl titanate and one or more of acetylacetone, ethyl acetoacetate, and diethanolamine.
4. The lightweight self-curing electrical insulation coating material according to claim 3, characterized in that the titanate chelate is a chelate of isopropyl titanate with ethyl acetoacetate.
5. The light self-curing electric insulation coating material according to claim 1, wherein the nano hollow microspheres are one or more of silicon carbide hollow microspheres, corundum hollow microspheres, cerium oxide hollow microspheres, zirconium oxide hollow microspheres, glass hollow microspheres and ceramic hollow microspheres.
6. The lightweight self-curing electrical insulation coating material according to claim 5, wherein the nano hollow microspheres are glass hollow microspheres.
7. The method for preparing a lightweight self-curing electric insulation coating material according to any one of claims 1 to 6, comprising the steps of:
s1, uniformly mixing the modified organic silicon resin, the plasticizer, the hydrophobic fumed silica, the mildew preventive and the super wear-resistant carbon black to obtain a mixture A;
s2, uniformly mixing the mixture A and the nano hollow microspheres to obtain a mixture B;
s3, drying the mixture B, dripping a liquid mixture into the mixture B, and mixing to obtain a daub-shaped light self-curing electric insulation coating material finished product; wherein the liquid mixture is prepared by mixing a moisture scavenger, an adhesion promoter, a cross-linking agent and a titanate chelate.
8. An electric power line comprising a body made of a conductive metal material, the surface of the body having an insulating layer, wherein the insulating layer is made of the light self-curing electric insulating coating material according to any one of claims 1 to 6 or the light self-curing electric insulating coating material prepared by the preparation method according to claim 7.
9. The power line according to claim 8, wherein the insulating layer has a thickness of 2 to 3 mm.
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| CN111334186A (en) * | 2020-04-26 | 2020-06-26 | 浙江励德有机硅材料有限公司 | Room-temperature self-curing insulation coated silica gel and preparation method thereof |
| CN113278361A (en) * | 2021-05-14 | 2021-08-20 | 武汉露能科技有限公司 | High-voltage-resistance long-acting stable insulating paint applied to high-voltage power transmission line and preparation method thereof |
| CN114933854A (en) * | 2022-05-06 | 2022-08-23 | 杭州涂态科技有限公司 | Light high-thixotropic single-component insulating paint |
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