CN111057465A - Room-temperature-cured insulating coating material and preparation method thereof - Google Patents
Room-temperature-cured insulating coating material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a room-temperature cured insulating coating material which comprises, by weight, α parts, 75-95 parts of omega-dihydroxy polydimethylsiloxane, 5-25 parts of polypropylene, 1-15 parts of simethicone, 10-500 parts of a filler, 1-15 parts of a cross-linking agent, 1-15 parts of a coupling agent, 1-5 parts of a catalyst and 1-2 parts of a pigment.
Description
Technical Field
The invention relates to the field of room temperature curing coating materials, in particular to a room temperature curing insulating coating material and a preparation method thereof.
Background
The early built on stilts bare conductor, the biggest advantage does benefit to the heat dissipation in the use, and the cost is cheap, generally is used for open-air distribution lines to erect. Without an insulating sheath, the wires are directly exposed to the atmosphere and thus are susceptible to corrosion, and the use in populated areas, areas adjacent trees, cross-over of wires (rivers, ponds, viaducts, etc.) is prone to accidents. Therefore, in order to solve the above potential safety hazards, it is necessary to insulate the bare overhead conductor.
However, in the existing insulated construction of the overhead conductor, the conventional scheme is that the existing overhead bare conductor is replaced by an insulated conductor, so that the problems of long power failure time, tight construction period, high cost, need of replacing a tower and the like exist. Therefore, the original overhead bare conductor is directly insulated in the most efficient and rapid mode. At present, the insulation layers of the outer skins of the existing wires and cables in the market all adopt a high-temperature curing process, and the high-temperature curing process for external operation is difficult to realize. The insulating coating material for convenient insulating construction needs to meet the following conditions: the material can be coated and constructed, can be cured automatically in a short time at room temperature, and can reach the insulating performance index.
α, omega-dihydroxy polydimethylsiloxanes can be cured at room temperature, so α, omega-dihydroxy polydimethylsiloxanes are commonly used as RTV room temperature vulcanizing silicone rubber base compounds, but no α, omega-dihydroxy polydimethylsiloxanes are currently studied for use as cable insulation sheaths, and therefore there is a need to develop formulations and methods for preparing insulation coating materials using α, omega-dihydroxy polydimethylsiloxanes as the base compound.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the insulating coating material can be used for conveniently and quickly carrying out insulating treatment on the overhead bare conductor, and the power supply reliability of a distribution network is improved.
The technical scheme adopted by the invention is as follows:
the room-temperature cured insulating coating material comprises the following raw materials in parts by weight:
α, 75-95 parts of omega-dihydroxy polydimethylsiloxane;
5-25 parts of polypropylene;
1-15 parts of dimethyl silicone oil;
10-500 parts of a filler;
1-15 parts of a crosslinking agent;
1-15 parts of a coupling agent;
1-5 parts of a catalyst;
1-2 parts of pigment;
the α omega-dihydroxy polydimethylsiloxane has a kinematic viscosity of 1000-600000 cst at 25 ℃ and a kinematic viscosity of 5-1000 cst at 25 ℃.
Preferably, the α omega-dihydroxy polydimethylsiloxane has a kinematic viscosity of 5000-50000 cst at 25 ℃ and the dimethicone has a kinematic viscosity of 5-100 cst at 25 ℃.
More preferably, the α, omega-dihydroxy polydimethylsiloxane is composed of 60-80 parts by weight of the α, omega-dihydroxy polydimethylsiloxane with kinematic viscosity at 25 ℃ of 10000-600000 cst and 5-20 parts by weight of the α, omega-dihydroxy polydimethylsiloxane with kinematic viscosity at 25 ℃ of 1000-10000 cst.
Preferably, the α, omega-dihydroxy polydimethylsiloxane is 75-80 parts by weight, and the polypropylene is 5-10 parts by weight.
Preferably, the filler is selected from one or more of precipitated silica, fumed silica, nano activated calcium carbonate, light calcium carbonate, heavy calcium carbonate, aluminum hydroxide, silica micropowder and glass fiber powder.
Preferably, the crosslinking agent is selected from one or more of methyltriethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, isopropyltriethoxysilane, isopropyltrimethoxysilane, isobutyltriethoxysilane, isobutyltrimethoxysilane, tetramethoxysilane, and tetraethoxysilane.
Preferably, the coupling agent is selected from one or more of aminopropyltrimethoxysilane, aminopropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma-mercaptopropyltrimethoxysilane, isocyanatopropyltrimethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane/N- (β -aminoethyl) -gamma-aminopropyltrimethoxysilane, N-diethyl-3-aminopropyltrimethoxysilane, bis- [3- (methoxysilyl) -propyl ] -amine and 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane.
Preferably, the catalyst is selected from one or more of n-butyl titanate, tetraisobutyl titanate, n-propyl titanate, tetraisopropyl titanate, tert-butyl titanate and titanium chelate of ethyl acetoacetate.
Another aspect of the present invention relates to a method for preparing a room-temperature-curable insulating coating material, comprising the steps of:
s1, mixing α, omega-dihydroxy polydimethylsiloxane, polypropylene, simethicone, filler and pigment uniformly, and drying in vacuum at 100-150 ℃ to obtain a mixture;
and S2, cooling the mixture obtained in the step S1 to a temperature lower than 60 ℃, sequentially adding a coupling agent, a cross-linking agent and the coupling agent, and uniformly mixing to obtain the room-temperature-cured insulating coating material.
Wherein the vacuum drying time in S1 is 2-5 hours.
The invention also comprises the following:
(1) the α omega-dihydroxy polydimethylsiloxane has a general formula shown in formula (I) HO (SiMe)2O)nH is formula (I);
wherein n is a positive integer which makes the kinematic viscosity of α, omega-dihydroxy polydimethylsiloxane 1000-600000 cst at 25 ℃.
(2) The polypropylene has a compound of the general formula shown in formula (II):
-[CH2-CH(CH3)]n-formula (II); n is a positive integer.
(3) The dimethyl silicone oil comprises a structure shown in a formula (III):
Me3SiO-(SiMe2O)n-SiMe3formula (III);
wherein n is a positive integer which enables the kinematic viscosity of the silicone oil plasticizer to be 5-1000 cst at 25 ℃.
The invention has the following advantages:
(1) in the actual use process of the insulating coating material of the invention, α, omega-dihydroxy polydimethylsiloxane can utilize water molecules in air to initiate a series of crosslinking reactions under the combined action of a crosslinking agent, a coupling agent and a catalyst to be gradually cured, and finally an elastic rubber body with a three-dimensional network structure is formed.
(2) α, the long chain structure of omega-dihydroxy polydimethylsiloxane and polypropylene and filler particles mutually adsorb to form acting force, maintain a three-dimensional network structure, and endow the room-temperature-curable insulating coating material with the thixotropic characteristic of keeping the appearance shape unchanged under the condition of no shear force under the condition of no curing.
(3) The insulating coating material has good adaptivity and adhesion to the surface of a base material, and can be used for insulating protection in the power and communication industries. The insulating coating material of the invention provides a guarantee of construction materials for insulating the overhead bare conductor at one time, conveniently and quickly. Make built on stilts bare conductor effectively take precautions against insulation hidden danger such as tree obstacle, toy touching, external force short circuit, promote and join in marriage net power supply reliability.
(4) The insulating coating material provided by the invention is more suitable for insulating protection under the combined action of multiple fillers, and the dielectric property of the insulating coating material is improved. The addition of the white carbon black obviously improves the tensile strength, and the calcium carbonate, the silicon micro powder and the glass fiber powder can be used for adjusting the hardness of the product.
(5) The preparation method provided by the invention is simple and easy to control, has mild conditions, and is suitable for large-scale production and application. And the guarantee of construction materials is provided.
Detailed description of the preferred embodiments
In order to better understand the above technical solutions, the following detailed descriptions will be made with reference to specific embodiments.
Example 1
According to weight, 75 parts of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 20000cst, 10 parts of polypropylene, 5 parts of simethicone with the kinematic viscosity of 50cst, 5 parts of fumed silica, 15 parts of nano activated calcium carbonate, 10 parts of aluminum hydroxide and 2 parts of carbon black pigment are mixed in a planetary stirrer, heated to 120 ℃, mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, cooled to 50 ℃, slowly added with 3 parts of aminopropyltrimethoxysilane, 3 parts of methyltriethoxysilane and 1.5 parts of tetraisopropyl titanate mixed solution, continuously mixed to form a completely uniform semi-paste, and then vacuum-packaged and stored.
Example 2
60 parts by weight of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 50000cst, 15 parts by weight of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 5000cst, 10 parts by weight of polypropylene, 5 parts by weight of simethicone with the kinematic viscosity of 50cst, 5 parts by weight of fumed silica, 15 parts by weight of nano activated calcium carbonate, 10 parts by weight of aluminum hydroxide and 2 parts by weight of carbon black pigment are mixed in a planetary stirrer, and simultaneously heated to 120 ℃, and mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, after the base material is cooled to 50 ℃,3 parts by weight of aminopropyl trimethoxysilane, 3 parts by weight of methyl triethoxysilane and 1.5 parts by weight of tetraisopropyl titanate mixed solution are slowly added, and the mixture is continuously mixed to form a completely uniform semi-paste, and then the semi-paste is packaged in vacuum and is stored.
The insulating coating material obtained in the embodiment 2 is easier to extrude and more suitable for machine construction, and the extrusion performance of the coating material can be adjusted by matching two or more kinds of α, omega-dihydroxy polydimethylsiloxane with different viscosities according to a certain proportion so as to adapt to construction of different machines and different construction conditions.
Example 3
According to weight, 65 parts of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 50000cst, 15 parts of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 1000cst, 10 parts of polypropylene, 10 parts of simethicone with the kinematic viscosity of 5cst, 5 parts of fumed silica, 20 parts of glass fiber powder, 10 parts of aluminum hydroxide and 2 parts of carbon black pigment are mixed in a planetary stirrer, simultaneously heated to 120 ℃, mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, the base material is cooled to 50 ℃, then 5 parts of aminopropyl trimethoxysilane, 3.5 parts of methyl triethoxysilane and 2 parts of tetraisopropyl titanate mixed solution are slowly added, the mixture is continuously mixed to form a completely uniform semi-paste, and then the semi-paste is packaged in vacuum and stored.
The insulating coating material obtained in example 3 is more easily extruded and is more suitable for machine construction. The hardness of the elastomer is obviously improved after the glass fiber powder is added and cured.
Example 4
60 parts by weight of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 80000cst, 20 parts by weight of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 1000cst, 10 parts by weight of polypropylene, 5 parts by weight of simethicone with the kinematic viscosity of 5cst, 5 parts by weight of fumed silica, 20 parts by weight of glass fiber powder, 50 parts by weight of silicon micropowder, 10 parts by weight of aluminum hydroxide and 2 parts by weight of carbon black pigment are mixed in a planetary stirrer, and simultaneously heated to 120 ℃, and mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, after cooling to 50 ℃, 5 parts by weight of aminopropyl trimethoxysilane, 3.5 parts by weight of methyl triethoxysilane and 2 parts by weight of tetraisopropyl titanate mixed liquid are slowly added, and the mixture is continuously mixed to form a completely uniform semi-paste, and then vacuum packaging and storage are carried out.
The insulating coating material obtained in example 4 was more easily extruded and more suitable for manual construction. The density of the coating material obtained by adding the silicon micropowder is obviously increased.
Comparative example 1
60 parts by weight of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 50000cst, 15 parts by weight of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 5000cst, 5 parts by weight of simethicone with the kinematic viscosity of 50cst, 5 parts by weight of fumed silica, 15 parts by weight of nano activated calcium carbonate, 10 parts by weight of aluminum hydroxide and 2 parts by weight of carbon black pigment are mixed in a planetary stirrer, and simultaneously heated to 120 ℃, and mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, after the base material is cooled to 50 ℃,3 parts of aminopropyl trimethoxysilane, 3 parts of methyl triethoxysilane and 1.5 parts of tetraisopropyl titanate mixed solution are slowly added, and the mixture is continuously mixed to form a completely uniform semi-paste, and then the semi-paste is packaged in vacuum and stored.
Comparative example 2
60 parts by weight of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 50000cst, 15 parts by weight of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 5000cst, 10 parts by weight of polypropylene, 5 parts by weight of simethicone with the kinematic viscosity of 50cst, 15 parts by weight of nano activated calcium carbonate, 10 parts by weight of aluminum hydroxide and 2 parts by weight of carbon black pigment are mixed in a planetary stirrer, and simultaneously heated to 120 ℃, mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, after the base material is cooled to 50 ℃,3 parts by weight of aminopropyl trimethoxysilane, 3 parts by weight of methyl triethoxysilane and 1.5 parts by weight of tetraisopropyl titanate are slowly added, and the mixed liquid is continuously mixed into a completely uniform semi-paste, and then the semi-paste is subjected to vacuum packaging and storage.
Comparative example 3
60 parts by weight of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 80000cst, 20 parts by weight of α omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 1000cst, 10 parts by weight of polypropylene, 5 parts by weight of simethicone with the kinematic viscosity of 5cst, 10 parts by weight of fumed silica and 2 parts by weight of carbon black pigment are mixed in a planetary stirrer, the mixture is heated to 120 ℃ at the same time, the mixture is mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, 5 parts by weight of aminopropyltrimethoxysilane, 3.5 parts by weight of methyltriethoxysilane and 2 parts by weight of tetraisopropyl titanate mixed solution are slowly added after the mixture is cooled to 50 ℃, and the mixture is continuously mixed to form a completely uniform semi-paste body, and then the semi-paste body is packaged in vacuum and is stored.
The insulating coating materials prepared in examples 1 to 4 and comparative examples 1 to 3 were tested for their respective properties: testing the surface drying time at 25 ℃ and in a 50% humidity environment; hardness was measured according to the test method described in GBT 2411-2008; the tensile strength and the elongation at break were tested according to the test methods described in GB/T528-2009; the volume resistivity was measured according to the test method described in GB/T1410-2006; the breakdown voltage was tested according to the test method described in GB/T1410.1-2006, see Table 1 for test results.
TABLE 1 summary of the tests of examples 1-2 and comparative example 1
As is clear from table 1, in examples 1 to 4, polypropylene was added to form a three-dimensional network in a liquid system, and the thixotropic effect was exhibited by maintaining the paste form. In comparative example 1, no polypropylene was added and the resulting product sagged and sagged during use. In comparative example 2, no white carbon black was added, and the mechanical properties, tensile strength and elongation at break of the obtained product after curing were significantly lower than those of the room temperature curable insulating coating materials prepared in examples 1 to 4. In comparative example 3, no filler such as calcium carbonate, fine silica powder, glass fiber powder and the like was added, and the insulation was remarkably inferior to that of the room-temperature-curable insulating coating materials prepared in examples 1 to 4.
Claims (10)
1. The room-temperature-cured insulating coating material is characterized by comprising the following raw materials in parts by weight:
α, 75-95 parts of omega-dihydroxy polydimethylsiloxane;
5-25 parts of polypropylene;
1-15 parts of dimethyl silicone oil;
10-500 parts of a filler;
1-15 parts of a crosslinking agent;
1-15 parts of a coupling agent;
1-5 parts of a catalyst;
1-2 parts of pigment;
the α omega-dihydroxy polydimethylsiloxane has a kinematic viscosity of 1000-600000 cst at 25 ℃ and a kinematic viscosity of 5-1000 cst at 25 ℃.
2. The room temperature curing insulating coating material as claimed in claim 1, wherein the α omega-dihydroxy polydimethylsiloxane has a kinematic viscosity of 5000-50000 cst at 25 ℃ and the dimethicone has a kinematic viscosity of 5-100 cst at 25 ℃.
3. The room temperature curing insulating coating material according to claim 1, wherein the α, ω -dihydroxypolydimethylsiloxane is composed of 60 to 80 parts by weight of the α, ω -dihydroxypolydimethylsiloxane having a kinematic viscosity at 25 ℃ of 10000 to 600000cst, and 5 to 20 parts by weight of the α, ω -dihydroxypolydimethylsiloxane having a kinematic viscosity at 25 ℃ of 1000 to 10000 cst.
4. The room-temperature-curable insulating coating material according to claim 1, wherein the α, omega-dihydroxy polydimethylsiloxane is 75-80 parts by weight, and the polypropylene is 5-10 parts by weight.
5. A room temperature-curable insulating coating material according to any one of claims 1 to 4, wherein: the filler is selected from one or more of precipitated white carbon black, gas-phase white carbon black, nano active calcium carbonate, light calcium carbonate, heavy calcium carbonate, aluminum hydroxide, silicon micropowder and glass fiber powder.
6. A room temperature-curable insulating coating material according to any one of claims 1 to 4, wherein: the cross-linking agent is selected from one or more of methyltriethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, isopropyltriethoxysilane, isopropyltrimethoxysilane, isobutyltriethoxysilane, isobutyltrimethoxysilane, tetramethoxysilane and tetraethoxysilane.
7. A room temperature-curable insulating coating material according to any one of claims 1 to 4, wherein the coupling agent is selected from one or more of aminopropyltrimethoxysilane, aminopropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma-mercaptopropyltrimethoxysilane, isocyanatopropyltrimethoxysilane, gamma- (2, 3-glycidoxy) propyltrimethoxysilane/N- (β -aminoethyl) -gamma-aminopropyltrimethoxysilane, N-diethyl-3-aminopropyltrimethoxysilane, bis- [3- (methoxysilyl) -propyl ] -amine and 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane.
8. A room temperature-curable insulating coating material according to any one of claims 1 to 4, wherein: the catalyst is selected from one or more of n-butyl titanate, tetraisobutyl titanate, n-propyl titanate, tetraisopropyl titanate, tert-butyl titanate and titanium chelate of ethyl acetoacetate.
9. A method for preparing a room-temperature-curing insulating coating material according to any one of claims 1 to 8, comprising the steps of:
s1, mixing α, omega-dihydroxy polydimethylsiloxane, polypropylene, simethicone, filler and pigment uniformly, and drying in vacuum at 100-150 ℃ to obtain a mixture;
and S2, cooling the mixture obtained in the step S1 to a temperature lower than 60 ℃, sequentially adding a coupling agent, a cross-linking agent and the coupling agent, and uniformly mixing to obtain the room-temperature-cured insulating coating material.
10. The method for preparing a room-temperature-curing insulating coating material according to claim 9, wherein: and the vacuum drying time in S1 is 2-5 hours.
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| CN111423728A (en) * | 2020-05-22 | 2020-07-17 | 湖南航天三丰科工有限公司 | Heat insulation composite material and preparation method thereof |
| CN113969104A (en) * | 2020-07-22 | 2022-01-25 | 长鑫存储技术有限公司 | Lead-free glass paste, chip resistor and preparation method thereof |
| CN115232556A (en) * | 2022-08-19 | 2022-10-25 | 广州信粤新材料科技有限公司 | Organic silicon composite material resistant to high voltage of 10KV and preparation method thereof |
| CN115895436A (en) * | 2022-11-14 | 2023-04-04 | 湖南航天三丰科工有限公司 | Insulating coating material and preparation method thereof |
| CN116102976A (en) * | 2022-12-08 | 2023-05-12 | 国网湖北省电力有限公司孝感供电公司 | Special anti-icing flame-retardant insulating silicon coating for cable line cladding |
| CN116285674A (en) * | 2022-12-08 | 2023-06-23 | 国网湖北省电力有限公司孝感供电公司 | Special anti-icing intrinsic flame-retardant insulating silicone coating for cable line cladding |
| CN116496695A (en) * | 2023-05-04 | 2023-07-28 | 武汉露能科技有限公司 | Insulating coating material for high-voltage transmission line and preparation method thereof |
| US11802076B2 (en) | 2020-07-22 | 2023-10-31 | Changxin Memory Technologies, Inc. | Lead-free glass paste, chip resistor and method for producing same |
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| CN113969104A (en) * | 2020-07-22 | 2022-01-25 | 长鑫存储技术有限公司 | Lead-free glass paste, chip resistor and preparation method thereof |
| CN113969104B (en) * | 2020-07-22 | 2023-05-23 | 长鑫存储技术有限公司 | Leadless glass slurry, chip resistor and preparation method thereof |
| US11802076B2 (en) | 2020-07-22 | 2023-10-31 | Changxin Memory Technologies, Inc. | Lead-free glass paste, chip resistor and method for producing same |
| CN115232556A (en) * | 2022-08-19 | 2022-10-25 | 广州信粤新材料科技有限公司 | Organic silicon composite material resistant to high voltage of 10KV and preparation method thereof |
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| CN116285674A (en) * | 2022-12-08 | 2023-06-23 | 国网湖北省电力有限公司孝感供电公司 | Special anti-icing intrinsic flame-retardant insulating silicone coating for cable line cladding |
| CN116102976B (en) * | 2022-12-08 | 2024-03-26 | 国网湖北省电力有限公司孝感供电公司 | Special anti-icing flame-retardant insulating silicon coating for cable line cladding |
| CN116285674B (en) * | 2022-12-08 | 2024-04-19 | 国网湖北省电力有限公司孝感供电公司 | Special anti-icing intrinsic flame-retardant insulating silicone coating for cable line cladding |
| CN116496695A (en) * | 2023-05-04 | 2023-07-28 | 武汉露能科技有限公司 | Insulating coating material for high-voltage transmission line and preparation method thereof |
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