CN112769075A - Repairing method for overhead line insulating protective layer - Google Patents
Repairing method for overhead line insulating protective layer Download PDFInfo
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- CN112769075A CN112769075A CN202011341193.9A CN202011341193A CN112769075A CN 112769075 A CN112769075 A CN 112769075A CN 202011341193 A CN202011341193 A CN 202011341193A CN 112769075 A CN112769075 A CN 112769075A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/16—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for repairing insulation or armouring of cables
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
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Abstract
The invention provides a repairing method of an overhead line insulation protective layer, which comprises the following steps: step 1, coating a part to be repaired by using an insulating tape; the part to be repaired is a cable core; step 2, wrapping the outer surface of the insulating tape by using single-component insulating cement; and 3, winding and protecting the outer side of the single-component insulating daub by using a waterproof tape. Firstly, wrapping an insulating tape on the outer side of a cable core to play a primary protection role on the cable core; then, the single-component insulating clay provided by the invention is wrapped outside the insulating tape, and on one hand, the insulating tape can be protected from being damaged by environmental factors, and on the other hand, the insulativity, the durability and the like of a finally obtained repairing layer can be further improved; and finally, wrapping the waterproof adhesive tape on the outer side of the single-component insulating daub, so that the waterproof and moistureproof performance of the repairing layer is improved, and the durability of the repairing layer is improved.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a method for repairing an insulated protective layer of an overhead line.
Background
The overhead line installed in the urban distribution environment is complex in environment, and the conditions of short circuit grounding and cable lightning stroke often occur, so that the power supply reliability is reduced, and therefore, in order to improve the power supply reliability of an urban power grid, the overhead line with an insulating protective layer is generally adopted from the aspects of safety, water resistance, moisture resistance and the like. Among them, crosslinked polyethylene is widely used for manufacturing an insulating layer of an overhead wire because it has excellent properties in terms of heat resistance, insulation, mechanical resistance, chemical resistance, and the like.
However, during the actual use of the overhead wire, the overhead wire is often subjected to external forces such as pulling, cutting, etc. from the outside, thereby causing damage to the insulation layer of the overhead wire, and the overhead wire used in the center of a city has great inconvenience in maintenance and replacement of the overhead wire due to the complexity of the surrounding environment.
Therefore, in order to solve the above problems, there is a need in the art for a new method for repairing an insulation protection layer of an overhead wire.
Disclosure of Invention
In order to solve the problems, the invention provides a method for repairing an insulated protective layer of an overhead line, and aims to provide a repairing method which has the characteristics of simplicity in operation, high repairing efficiency, easiness in implementation in an urban power grid and the like.
In a first aspect, an embodiment of the present invention provides a method for repairing an insulated protection layer of an overhead line, where the method includes:
step 1, coating a part to be repaired by using an insulating tape; the part to be repaired is a cable core;
step 2, wrapping the outer surface of the insulating tape with single-component insulating cement;
and 3, winding and protecting the outer side of the single-component insulating cement by using a waterproof adhesive tape.
Preferably, the insulating tape includes: the base band and the pressure-sensitive adhesive layer;
the preparation raw materials of the base band comprise: at least one of cotton cloth, synthetic fiber fabric and plastic film; the preparation raw materials of the adhesive layer comprise: rubber, compounding agents; the compounding agent comprises: tackifying resin;
the waterproof tape includes: a substrate and a protective layer;
the preparation raw material of the base material comprises ethylene propylene rubber; the preparation raw materials of the protective layer comprise: and (3) rubber cement.
Preferably, the single-component insulating cement is a cement-like material of polyurethane cement, and comprises the following raw materials in parts by weight:
based on 100 parts by weight of the single-component insulating cement, 20-30 parts of polyether polyol, 12-24 parts of isocyanate, 12-20 parts of surface hydroxyl modified paraffin, 0.5-2 parts of thickening agent, 0-1 part of catalyst, 5-10 parts of flame retardant, 1-10 parts of latent curing agent and 25-35 parts of solid filler.
Preferably, the polyether polyol comprises at least one of propylene oxide polyether polyol and polytetrahydrofuran polyol;
the hydroxyl value of the polyether polyol is 10-100 mgKOH/g.
Preferably, the isocyanate comprises: at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate; the diphenylmethane diisocyanate comprises liquefied modified diphenylmethane diisocyanate and non-liquefied modified diphenylmethane diisocyanate; among them, liquefied modified diphenylmethane diisocyanate is preferable. The liquefaction modification comprises carbodiimide modification.
Preferably, the preparation method of the hydroxyl surface-modified paraffin wax comprises the following steps:
reacting hydrogen peroxide or ozone with the paraffin wax which is heated and liquefied, cooling to room temperature after the reaction is finished, and filtering to obtain the particles after the paraffin wax is condensed into particles again;
washing the particles with water until the pH value is neutral, wherein the washed particles are the hydroxyl surface modified paraffin;
the number of the surface hydroxyl modified paraffin is 0.05-0.2 mmol/g.
Preferably, the solid filler comprises: at least one of titanium dioxide, clay, talcum powder, light calcium carbonate, heavy calcium carbonate, fumed silica and quartz powder;
the mass ratio of the light calcium carbonate to the fumed silica is 12-18: 1-2; the particle size of the light calcium carbonate is 20-60 nm, and the specific surface area of the fumed silica is 170-220 m2/g。
Preferably, the thickening agent comprises a cellulose ether;
the cellulose ether comprises: at least one of hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether.
Preferably, the catalyst comprises: at least one of tertiary amine catalyst and organic metal catalyst;
the tertiary amine catalyst comprises: at least one of triethylene diamine, triethylamine, tributylamine, triethylene diamine, and N, N-dimethylaniline;
the organometallic catalyst includes: at least one of organic bismuth and organic tin;
the organic bismuth comprises: at least one of bismuth isooctanoate, bismuth laurate, bismuth neodecanoate and bismuth naphthenate;
the organic tin comprises at least one of tin octoate, tin ethylhexanoate, tin laurate, dibutyltin oxide, dibutyltin dichloride, dibutyltin diacetate, dibutyltin maleate and dioctyltin diacetate;
when the catalyst comprises a tertiary amine catalyst and an organic metal catalyst, the mass ratio of the tertiary amine catalyst to the organic metal catalyst is 6-10: 1-2.
Preferably, the latent curing agent comprises at least one of oxazolidine latent curing agent and diimine latent curing agent.
Preferably, the one-component insulating cement further comprises: an auxiliary agent;
the auxiliary agent comprises: at least one of a toughening agent, a plasticizer, a stabilizer, a mildew preventive and color paste.
In a second aspect, an embodiment of the present invention provides an insulation repair part, which sequentially includes, from inside to outside: the insulation tape layer, the single-component insulation daub layer and the waterproof tape layer;
the insulation repair is prepared by the method of the first aspect.
The invention provides a repairing method of an insulated protective layer of an overhead line, which comprises the following steps: step 1, coating a part to be repaired by using an insulating tape; the part to be repaired is a cable core; step 2, wrapping the outer surface of the insulating tape by using single-component insulating cement; and 3, winding and protecting the outer side of the single-component insulating daub by using a waterproof tape. According to the method provided by the embodiment of the invention, firstly, the outer side of a cable core is wrapped with an insulating tape so as to play a primary protection role on the cable core; then, the single-component insulating clay provided by the invention is wrapped outside the insulating tape, and on one hand, the insulating tape can be protected from being damaged by environmental factors, and on the other hand, the insulativity, the durability and the like of a finally obtained repairing layer can be further improved; and finally, wrapping the waterproof adhesive tape on the outer side of the single-component insulating daub, so that the waterproof and moistureproof performance of the repairing layer is improved, and the durability of the repairing layer is improved. In addition, compared with the prior art, the repairing method provided by the invention also has the following beneficial effects:
1. the repairing method provided by the invention can complete the repairing of the overhead line only by three steps of operation, and each step of operation is extremely simple, so that the overhead line can be repaired quickly and efficiently. Therefore, the restoration method provided by the invention has the characteristics of simple operation, high restoration efficiency, easiness in implementation in the urban power grid and the like.
2. The single-component insulating cement provided by the invention has no bonding interface because the single-component insulating cement can be kneaded to obtain a self-fused integral material, and the problem of water resistance failure caused by bonding performance failure does not need to be worried.
Drawings
Fig. 1 is a flowchart illustrating a method for repairing an overhead line insulation protection layer according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an overhead wire insulation protection layer repaired by the repairing method provided by the invention in the embodiment of the invention;
fig. 3 shows a schematic structural view of an insulation repair in an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below. The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
At present, a simple method for processing the damage of an insulating layer of an overhead line is to wind a high-voltage overhead transmission line by using an insulating tape, but the tape is easy to fall off due to the influence of factors such as sunlight irradiation, temperature and humidity in the environment. The person skilled in the art also proposes different solutions, for example:
scheme 1 provides an insulation protection piece for high-voltage overhead transmission lines, which comprises a waterproof adhesive tape, a bonding main insulation layer, a silica gel layer and a thermal shrinkage insulation layer from inside to outside, wherein the thermal shrinkage insulation layer is softened and tightened and fixed on the transmission line through hot blowing during construction, but the method needs to additionally carry a heat source, and is inconvenient to operate.
Scheme 2 provides a method for forming an insulating protective layer of a high-voltage overhead line by adopting a glue coating mode, which comprises the steps of coating a solvent-free coating on a power transmission line to form a first layer; after the first layer is semi-dry or dry, winding an electric insulating tape on the first layer to form a tape layer; and the adhesive tape layer is coated with solvent-free paint to form a second coating, and the method has low repair efficiency on the partially damaged overhead line insulating layer.
In order to solve the above problem, in a first aspect, an embodiment of the present invention provides a method for repairing an overhead line insulating protection layer, and fig. 1 shows a flowchart of a method for repairing an overhead line insulating protection layer in an embodiment of the present invention; as shown in fig. 1, the repairing method includes:
step 1(S11), an insulating tape is adopted to coat a part to be repaired to obtain a first repairing layer; the part to be repaired is a cable core;
step 2(S12), wrapping the outer surface of the insulating tape by using single-component insulating cement to obtain a second repairing layer;
and step 3(S13), winding and protecting the outer side of the single-component insulating mastic by using a waterproof tape to obtain a repairing layer.
When the method is specifically implemented, a repair worker wraps the outer side of the cable core by using the insulating adhesive tape, then wraps and compacts the cable core by using single-component insulating cement, and finally winds and protects the outer side of the cable core by using the waterproof adhesive tape. The first repairing layer is an insulating tape layer formed by an insulating tape, the second repairing layer is a repairing layer composed of an insulating tape layer and a single-component insulating clay layer, and the repairing layer is a final repairing layer composed of the insulating tape layer, the single-component insulating clay layer and a waterproof tape layer, namely an insulating repairing piece.
According to the method provided by the embodiment of the invention, firstly, the outer side of a cable core is wrapped with an insulating tape so as to play a primary protection role on the cable core; then, the single-component insulating clay provided by the invention is wrapped outside the insulating tape, and on one hand, the insulating tape can be protected from being damaged by environmental factors, and on the other hand, the insulativity, the durability and the like of a finally obtained repairing layer can be further improved; and finally, wrapping the waterproof adhesive tape on the outer side of the single-component insulating daub, so that the waterproof and moistureproof performance of the repairing layer is improved, and the durability of the repairing layer is improved. In addition, compared with the prior art, the repairing method provided by the invention also has the following beneficial effects:
the repairing method provided by the invention can complete the repairing of the overhead line only by three steps of operation, and each step of operation is extremely simple, so that the overhead line can be repaired quickly and efficiently. Therefore, the restoration method provided by the invention has the characteristics of simple operation, high restoration efficiency, easiness in implementation in the urban power grid and the like.
In this embodiment, preferably, the insulating tape includes: the base band and the pressure-sensitive adhesive layer. Wherein, the preparation raw materials of the base band comprise: at least one of cotton cloth, synthetic fiber fabric and plastic film; the preparation raw materials of the adhesive layer comprise: rubber, compounding agents; the compounding agent comprises: tackifying resin;
the waterproof adhesive tape comprises: a substrate and a protective layer. Wherein, the preparation raw material of the base material comprises ethylene propylene rubber; the preparation raw materials of the protective layer comprise: and (3) rubber cement.
In this embodiment, preferably, the single-component insulating cement is a cement-like material of polyurethane cement, and includes the following raw materials in parts by weight:
based on 100 parts by weight of the single-component insulating cement, 20-30 parts of polyether polyol, 12-24 parts of isocyanate, 12-20 parts of surface hydroxyl modified paraffin, 0.5-2 parts of thickening agent, 0-1 part of catalyst, 5-10 parts of flame retardant, 1-10 parts of latent curing agent and 25-35 parts of solid filler.
The catalyst is used for adjusting the curing time of the single-component insulating mortar, and when the single-component insulating mortar is prepared, an operator can adjust the amount of the added catalyst according to the length of the curing time and then prepare the single-component insulating mortar with different curing times, so that when the single-component insulating mortar is used for repairing an insulating layer, a single-component insulating mortar product with corresponding curing time can be selected according to the requirement of the curing time; also, in general, the more catalyst used, the shorter the cure time; when the catalyst is 0 part, it means that no catalyst is added.
In fact, in order to improve the flame retardance of the single-component insulating mortar and thus enhance the service life of the insulation protection layer repair, the inventor adds a flame retardant to the single-component insulating mortar to realize the service life of the overhead wire.
The invention adopts the mud material of polyurethane glue as the base resin to wrap the damaged part of the overhead line protective layer, and the mud material of polyurethane glue has good insulating property, high strength, good bonding force, durability and plasticity. Therefore, when the repairing layer is used for wrapping the insulating tape, the insulativity and the strength of the repairing layer can be further improved, the adhesiveness of the daub, the insulating tape and the peripheral undamaged insulating protective layer can be improved through good bonding force, the service life of the repairing layer is prolonged through good durability, and the damaged structure can be quickly filled and the insulating tape can be wrapped through good plasticity.
In specific implementation, the preparation method of the single-component insulating mastic may include the following steps:
(A1) adding polyether polyol and optionally adding an auxiliary agent, heating and dehydrating under the condition of negative pressure, cooling, adding isocyanate, and heating to react to obtain a prepolymer;
(A2) dehydrating the solid filler at high temperature;
(A3) stirring the prepolymer obtained in the step (A1), the dehydrated filler obtained in the step (A2), hydroxyl surface modified paraffin, a thickening agent, a latent curing agent and other auxiliary agents into a daub shape to obtain a final product;
the single-component insulating cement provided by the method is convenient and quick to use and can be obtained only by curing at room temperature. The single-component daub provided by the invention is fast in curing and the curing time is 30-120 min. Meanwhile, the single-component daub is not sticky, can be directly kneaded by hands without special equipment, and has convenient operation.
The obtained daub after curing has excellent comprehensive performance and strong plasticity; meanwhile, the adhesive property is good, the adhesive can be used for waterproof insulation sealing, and the mechanical property can be kept for a long time under the conditions of high temperature, high humidity and high salt.
In this embodiment, preferably, the polyether polyol includes at least one of propylene oxide polyether polyol and polytetrahydrofuran polyol; the hydroxyl value of the polyether polyol is 10-100 mgKOH/g.
In this embodiment, preferably, the isocyanate comprises: at least one of Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI), Lysine Diisocyanate (LDI); preferably a liquefied modified diphenylmethane diisocyanate, more preferably a carbodiimide modified MDI.
In this embodiment, preferably, the preparation method of the hydroxyl surface-modified paraffin wax includes:
reacting hydrogen peroxide or ozone with the paraffin wax which is heated and liquefied, cooling to room temperature after the reaction is finished, and filtering to obtain the particles after the paraffin wax is condensed into particles again;
washing the particles with water until the pH value is neutral, wherein the washed particles are the hydroxyl surface modified paraffin;
the number of the surface hydroxyl modified paraffin is 0.05-0.2 mmol/g, preferably 0.08-0.15 mmol/g.
In specific implementation, the preparation method of the hydroxyl surface modified paraffin wax may be: reacting hydrogen peroxide or ozone with paraffin wax which is heated and liquefied, cooling to room temperature, condensing the paraffin wax into particles again, filtering, and washing with water until the pH value is neutral to obtain the hydroxyl surface modified paraffin wax.
In the step of modifying the surface of the paraffin wax by the hydroxyl group, the reaction is carried out for 5-60min under the condition of 40-60 ℃, and the concentration of hydrogen peroxide is 5-20 wt%; more preferably, the reaction condition is that the reaction is carried out for 10 to 20min at the temperature of between 40 and 60 ℃, and the concentration of hydrogen peroxide is between 10 and 15 percent by weight.
In this embodiment, the amount of the hydrogen peroxide is not particularly limited, and the number of the hydroxyl groups on the surface of the paraffin after the surface modification of the paraffin depends on the concentration of the hydrogen peroxide and the reaction time. The amount of hydrogen peroxide is enough to completely immerse the paraffin. The volume dosage of the hydrogen peroxide is 2 to 5 times (ml/g) of the mass of the paraffin generally.
In addition, in the embodiment, after the surface hydroxyl of the paraffin is modified by hydrogen peroxide or ozone, a small amount of hydroxyl is arranged on the surface of the paraffin, so that on one hand, certain surface lubricity can be provided when the two components are not cured, and an operator cannot stick hands when kneading; on the other hand, after the final curing, the paraffin plays a plasticizing effect, and because the interface is fully wetted, the hydroxyl on the surface is combined with the isocyanate of the curing agent, so that the adhesive has good adhesive force with a base surface and good compatibility, the material cannot crack due to migration after the curing, the pulverization and the deformation are also good due to the good compatibility, and the daub obtained after the curing has good weather resistance under the environments of high temperature, high humidity, high salt and the like, and can play a good protection role on overhead lines for a long time in severe environments.
In this embodiment, preferably, the solid filler includes: at least one of titanium dioxide, clay, talcum powder, light calcium carbonate, heavy calcium carbonate, fumed silica and quartz powder;
when the solid filler consists of calcium hydrogen and fumed silica, the mass ratio of the light calcium to the fumed silica is 12-18: 1-2; the particle size of the light calcium carbonate is 20-60 nm, and the specific surface area of the fumed silica is 170-220 m2/g。
In this embodiment, preferably, the thickening agent comprises a cellulose ether;
the cellulose ether comprises: at least one of hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether.
In this embodiment, preferably, the catalyst includes: at least one of tertiary amine catalyst and organic metal catalyst; wherein the tertiary amine catalyst comprises: at least one of triethylene diamine, triethylamine, tributylamine, triethylene diamine, and N, N-dimethylaniline; the organometallic catalyst includes: at least one of organic bismuth and organic tin;
the organic bismuth comprises: at least one of bismuth isooctanoate, bismuth laurate, bismuth neodecanoate and bismuth naphthenate;
the organic tin comprises at least one of tin octoate, tin ethylhexanoate, tin laurate, dibutyltin oxide, dibutyltin dichloride, dibutyltin diacetate, dibutyltin maleate and dioctyltin diacetate;
when the catalyst comprises a tertiary amine catalyst and an organic metal catalyst, the mass ratio of the tertiary amine catalyst to the organic metal catalyst is 6-10: 1-2. And through adopting compound catalyst, the adjustment ratio for the material reaction is comparatively mild, and later stage solidification is fast, leaves certain operating time promptly and conveniently solidifies the shaping, simultaneously because later stage solidification is fast, makes holistic curing time still can control within 30 min.
In this embodiment, the latent curing agent preferably includes at least one of an oxazolidine latent curing agent and a diimine latent curing agent.
The role of the latent curing agent in this example is: 1. the problem of foaming of the single-component insulating cement in the preparation process is fundamentally solved, and the phenomenon that the repair layer is damaged due to the fact that hidden bubbles inside the single-component insulating cement need to overflow outwards after the single-component insulating cement is wrapped by the waterproof adhesive tape is avoided; 2. the hardness and tensile strength of the one-component insulating cement can be enhanced.
In this embodiment, preferably, the one-component insulating cement further includes: an auxiliary agent; the auxiliary agent comprises: at least one of a toughening agent, a plasticizer, a stabilizer, a mildew preventive and color paste.
In the single-component insulating mortar provided by the invention, some auxiliary agents can be added according to actual requirements, and the types and the use amounts of the auxiliary agents are well known in the field. Such as, but not limited to, toughening agents, plasticizers, stabilizers, flame retardants, mold inhibitors, color pastes, and the like.
For example, in one embodiment of the present invention, the amounts of the toughening agent and the plasticizer are 0.5 to 1 part, the amount of the stabilizer is 0.1 to 0.3 part, the amount of the anti-mold agent is 1 to 2 parts, and the amount of the color paste is 1 to 5 parts. These auxiliaries can be present as constituents of the A component and/or of the B component, provided that the total amount is ensured within a certain value range.
The flame retardant is not particularly limited, and may be an organic flame retardant or an inorganic flame retardant, and the organic flame retardant is preferably a phosphorus flame retardant, such as at least one of TCEP, TCPP, TDCPP, DMMP, triphenyl phosphate, and MPP; and the inorganic flame retardant is at least one selected from hydrated aluminum hydroxide, hydrated magnesium hydroxide, monoammonium phosphate, diammonium phosphate, ammonium chloride, boric acid, hydrated zinc borate and expanded graphite.
The mildew preventive is an inorganic mildew preventive or an organic mildew preventive, and the organic mildew preventive comprises at least one of sodium diacetate, potassium sorbate, sodium sorbate, potassium citrate, sodium citrate, calcium propionate, sodium ascorbate, potassium ascorbate, sodium salicylate, dodecylalanine, cason, methylparaben, ethylparaben and lysozyme; the inorganic mildew preventive comprises at least one of nano silver, nano zinc oxide and nano titanium dioxide.
The color paste is selected from at least one of red phthalocyanine blue, permanent red, carbon black, titanium pigment, complex dye, phthalocyanine green, medium yellow, scarlet, iron yellow, carbon black and permanent red.
In order to make the present invention more understandable to those skilled in the art, the method for preparing the hydroxyl surface-modified paraffin according to the present invention is described below by using a plurality of specific preparation examples. In the embodiment of the present invention, the number of the surface hydroxyl groups of the paraffin wax may be measured by a conventional method, for example, a grignard reagent titration method.
Preparation example 1
Heating 20g of paraffin to above 60 ℃, liquefying the paraffin, putting into 50mL of 20 wt% hydrogen peroxide, stirring and reacting for 45min at 40 ℃, quickly transferring into an ice-water bath, cooling to room temperature, condensing the paraffin into particles, filtering, washing with water to neutrality, and then putting the paraffin with the surface hydroxyl modified into a vacuum drying oven to dry at 25-30 ℃ to obtain the modified paraffin 1. The test shows that the number of the hydroxyl on the surface of the modified paraffin is 0.132 mmol/g.
Preparation example 2
The operation of this example is similar to example 1, except that: the concentration of hydrogen peroxide is 15 wt%, the reaction temperature is 60 ℃, the reaction time is 30min, the modified paraffin 2 is obtained, and the number of surface hydroxyl groups of the modified paraffin 2 is 0.164 mmol/g.
Preparation example 3
The operation of this example is similar to example 1, except that: the concentration of hydrogen peroxide is 5 wt%, the reaction temperature is 60 ℃, the reaction time is 60min, modified paraffin 3 is obtained, and the number of surface hydroxyl groups of the obtained modified paraffin 3 is 0.253 mmol/g.
Preparation example 4
The operation of this example is similar to example 1, except that: replacing hydrogen peroxide with ozone, wherein the reaction temperature is 60 ℃, the reaction time is 30min, and the modified paraffin 4 is obtained, and the number of surface hydroxyl groups of the obtained modified paraffin 4 is 0.327 mmol/g.
In order to make the present invention more understandable to those skilled in the art, the method for preparing the one-component insulating cement of the present invention is illustrated below by using a plurality of specific preparation examples.
Example 1
(A1) Adding 20 parts of epoxypropane polyether polyol, and dehydrating for 2 hours at the temperature of 110 ℃ under the negative pressure of-0.08 MPa; cooling to 60 ℃, adding 20 parts of carbodiimide modified MDI, continuously stirring, slowly heating to 80 ℃, and carrying out temperature-controlled polymerization for 3 hours to obtain a prepolymer;
(A2)30 parts of light calcium carbonate and fumed silica are dehydrated for 4 hours at 160 ℃ according to the compound solid filler with the mass ratio of 15: 1;
(A3) and (3) adding the prepolymer obtained in the step (A1) and the dehydrated solid filler obtained in the step (A2) into a planetary stirring kettle, and stirring 15 parts of the modified paraffin 1 prepared in the preparation example 1, 1 part of hydroxyethyl methyl cellulose ether, 9 parts of a diimine latent curing agent BHD-505 and 5 parts of triphenyl phosphate into a daub-shaped product to obtain the one-component insulating daub No. 1.
Example 2
The procedure of this preparation is similar to that of example 1, except that the reaction starting materials are: 25 parts of polytetrahydrofuran polyol, 20 parts of toluene diisocyanate, 18 parts of modified paraffin wax prepared in preparation example 1, 2 parts of hydroxypropyl methyl cellulose ether, 25 parts of titanium dioxide, 5 parts of oxazolidine latent curing agent, 1 part of triethylene diamine and 7 parts of hydrated magnesium hydroxide; and the single-component insulating clay prepared in the preparation example is used as the single-component insulating clay No. 2.
Example 3
The procedure of this preparation is similar to that of example 1, except that the reaction starting materials are: 30 parts of polytetrahydrofuran polyol, 12 parts of dicyclohexylmethane diisocyanate, 20 parts of modified paraffin wax 1 prepared in preparation example 1, 0.5 part of hydroxypropyl methyl cellulose ether, 25 parts of talcum powder, 4 parts of oxazolidine latent curing agent, 0.5 part of tin ethylhexanoate and 8 parts of expanded graphite; and the single-component insulating clay prepared in the preparation example is used as the single-component insulating clay No. 3.
The applicant should note that, in each preparation example of the present invention, the amount of each component may be adjusted according to the needs of the operator, and is not limited in the examples of the present invention.
In another embodiment of the present invention, an embodiment of the present invention provides a repair method for a worker, where in an actual scene, a repair process for a damaged overhead line insulation protection layer specifically includes:
1. and cleaning the metal surface of the cable core.
2. And (4) using an insulating adhesive tape for wrapping protection.
3. The one-component insulating cement paste No. 1 prepared in example 1 was pressed on the surface of an insulating tape and compaction was secured.
4. And winding the waterproof adhesive tape on the surface of the insulating mastic.
5. And (6) appearance inspection.
FIG. 2 is a schematic cross-sectional view of an overhead wire insulation protection layer repaired by the repairing method provided by the invention in the embodiment of the invention; as shown in fig. 2, the cross section of the overhead wire insulation protection layer repaired by the worker is as follows: the insulating tape wraps the cable core; the single-component daub wraps the insulating tape and fills all the spaces at the damaged part of the cable insulating layer; the waterproof tape wraps the one-component mastic, and in order to enhance waterproofness, the wrapping area thereof is larger than the surface area of the one-component mastic.
In a second aspect, an embodiment of the present invention provides an insulation repair member, as shown in fig. 3, which includes, in order from inside to outside: the insulation tape layer, the single-component insulation daub layer and the waterproof tape layer;
the insulation repair member is prepared by the repair method of the first aspect.
For simplicity of explanation, the method embodiments are described as a series of acts or combinations, but those skilled in the art will appreciate that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are preferred embodiments and that the acts and elements referred to are not necessarily required to practice the invention.
The method for repairing an insulated protection layer of an overhead line provided by the invention is described in detail, a specific example is applied in the method to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A method for repairing an insulated protective layer of an overhead line is characterized by comprising the following steps:
step 1, coating a part to be repaired by using an insulating tape; the part to be repaired is a cable core;
step 2, wrapping the outer surface of the insulating tape with single-component insulating cement;
and 3, winding and protecting the outer side of the single-component insulating cement by using a waterproof adhesive tape.
2. The repair method of claim 1, wherein the insulating tape comprises: the base band and the pressure-sensitive adhesive layer;
the preparation raw materials of the base band comprise: at least one of cotton cloth, synthetic fiber fabric and plastic film; the preparation raw materials of the adhesive layer comprise: rubber, compounding agents; the compounding agent comprises: tackifying resin;
the waterproof tape includes: a substrate and a protective layer;
the preparation raw material of the base material comprises ethylene propylene rubber; the preparation raw materials of the protective layer comprise: and (3) rubber cement.
3. The repair method according to claim 1, wherein the single-component insulation mastic is a mastic of polyurethane mastic, comprising the following raw materials in parts by weight:
based on 100 parts by weight of the single-component insulating cement, 20-30 parts of polyether polyol, 12-24 parts of isocyanate, 12-20 parts of surface hydroxyl modified paraffin, 0.5-2 parts of thickening agent, 0-1 part of catalyst, 5-10 parts of flame retardant, 1-10 parts of latent curing agent and 25-35 parts of solid filler.
4. The repair method of claim 3, wherein the polyether polyol comprises at least one of a propylene oxide polyether polyol, a polytetrahydrofuran polyol; the hydroxyl value of the polyether polyol is 10-100 mgKOH/g;
the thickening agent comprises a cellulose ether; the cellulose ether comprises: at least one of hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether.
5. Repair method according to claim 3, characterized in that said isocyanate comprises: at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate; the diphenylmethane diisocyanate comprises liquefied modified diphenylmethane diisocyanate and non-liquefied modified diphenylmethane diisocyanate; the liquefaction modification comprises carbodiimide modification.
6. The repair method according to claim 3, wherein the hydroxyl surface-modified paraffin is prepared by a method comprising:
reacting hydrogen peroxide or ozone with the paraffin wax which is heated and liquefied, cooling to room temperature after the reaction is finished, and filtering to obtain the particles after the paraffin wax is condensed into particles again;
washing the particles with water until the pH value is neutral, wherein the washed particles are the hydroxyl surface modified paraffin;
the number of the surface hydroxyl modified paraffin is 0.05-0.2 mmol/g.
7. The repair method according to claim 3, wherein the solid filler comprises: at least one of titanium dioxide, clay, talcum powder, light calcium carbonate, heavy calcium carbonate, fumed silica and quartz powder;
the mass ratio of the light calcium carbonate to the fumed silica is 12-18: 1-2; the particle size of the light calcium carbonate is 20-60 nm, and the specific surface area of the fumed silica is 170-220 m2/g。
8. The repair method according to claim 3, wherein the catalyst comprises: at least one of tertiary amine catalyst and organic metal catalyst;
the tertiary amine catalyst comprises: at least one of triethylene diamine, triethylamine, tributylamine, triethylene diamine, and N, N-dimethylaniline;
the organometallic catalyst includes: at least one of organic bismuth and organic tin;
the organic bismuth comprises: at least one of bismuth isooctanoate, bismuth laurate, bismuth neodecanoate and bismuth naphthenate;
the organic tin comprises at least one of tin octoate, tin ethylhexanoate, tin laurate, dibutyltin oxide, dibutyltin dichloride, dibutyltin diacetate, dibutyltin maleate and dioctyltin diacetate;
when the catalyst comprises a tertiary amine catalyst and an organic metal catalyst, the mass ratio of the tertiary amine catalyst to the organic metal catalyst is 6-10: 1-2.
9. The repair method of claim 3, wherein the latent curing agent comprises at least one of an oxazolidine latent curing agent and a diimmonium latent curing agent;
wherein the single component insulating mastic further comprises: an auxiliary agent; the auxiliary agent comprises: at least one of a toughening agent, a plasticizer, a stabilizer, a mildew preventive and color paste.
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| CN202011341193.9A CN112769075A (en) | 2020-11-25 | 2020-11-25 | Repairing method for overhead line insulating protective layer |
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