TW528785B - High voltage insulation coating composition - Google Patents

Abstract

A high voltage insulation coating composition mainly comprises 28 to 32 wt% of polydimethylsiloxane, 31 to 35 wt% of dry Al2O3.3H2O, 2 to 3.6 wt% of a dye paste, 1.5 to 2.5 wt% of a filler, 1 to 3 wt% of an organic silicon cross-linking agent, 0.5 to 1.5 wt% of a binding promoter, 0.08 to 0.15 wt% of a condensation catalyst, and 5 to 35 wt% of a dry hydrocarbon solvent. A high voltage insulation coating layer of an organic polysiloxane rubber according to the present invention is mainly used as an insulation coating for a high voltage (over 69 KV) insulator for inhibiting the occurrence of current leakage and jump spark and improving the electrical properties in contaminated and moist environment and having a better leakage current resistance.

Description

528785 _Case No. 90117769_ YYYY _ «_ V. Description of the invention (1) The present invention relates to a high-voltage insulation coating composition, which is a room-temperature-curing type organic polysiloxane rubber composition. Cross-linking reactions generally form a protective layer on the surface of high-voltage insulators at room temperature, which can improve its electrical properties. According to the conventional high-voltage insulators, the structure of porcelain and glass is generally used, and porcelain and glass allow manufacturers to easily produce any shape of the appearance of insulators. Under normal circumstances, the insulators of porcelain and glass structures are not exposed to Slight pollution from the outside, electrical stress, and leakage can have a long service life. However, in case of pollution, in order to prevent excessive leakage, frequent cleaning or coating of a silicon-like compound is necessary, so the insulator Pollution has become a major obstacle to the continuous supply of electricity. In terms of glass and ceramic insulators, it is often used in power systems. When wet weather conditions cause the surface of insulators or pollutants to appear, uncontrollable leakage can occur and electronic flashovers can occur. Or power outage. In addition, the cost of this type of interruption can be very expensive. For example, a power interruption that lasts for a quarter of a second can cause a semiconductor wafer fabrication plant to stop, causing several hours of mechanical downtime and possible equipment damage. , Resulting in millions of yuan in losses in wafer production. At present, several kinds of organic silicone rubber coatings have been disclosed to improve the electrical characteristics of electronic insulators. Among all the published patents, bauxite has been pointed out to have improved electrical characteristics of electronic insulators, such as N i em i In U.S. Patent No. 4,4 7,6,15,5, a composite of polydioxosiloxy mixed with a terminal group containing hydrogen and oxygen and trihydrate is described, and the average particle size of the composite is The size is 5 // m; Adkins disclosed in U.S. Patent No. 4,822,830 that the particle size range of organic silicone rubber is

528785 -_Case No. 90117769_ Revised Year of the Month _5. Description of the invention (2) 2 ~ 1 m, and the optimal particle size range is 2 ~ 5 // m of trihydrate bauxite, which has improved adhesion and contact Angle, accelerated aging speed, improved arc resistance, long service life, resistance to loneliness, and improved resistance to leakage; Mistry provides an organic silicone rubber in US Patent No. 5,3 2 6,8 0 4 The addition of bauxite with an average particle size of 13 m has improved electrical characteristics; however, U.S. patents 4, 4 7 6, 1 5 5, 4, 8 2 2, 8 3 0, and 5, 3 2 6, 8 0 4 No., its optimal particle size is either too large or too small, and its leakage will be high. An effective method to evaluate the performance of the layer and the effectiveness of the best and worst ranked coating insulators is to apply a fixed high voltage energy and observe the continuous salt spray phenomenon in the test chamber. The nozzle in the test chamber is pressurized with high-pressure air. The salt mist is generated by changing salt water with a fixed salt concentration. The insulator is energized by a high-voltage transformer, and the surface of the insulator layer is affected by continuous salt mist to generate leakage current. It is monitored by a data collection system. Refer to Figure 1, which shows It is the change graph of the surface leakage and the salt spray time of the ceramic layer of the insulator; as shown in the figure, it shows typical results. Therefore, how to propose a novel high-voltage insulation coating composition for the above problems can not only improve the electrical properties when polluted, but also improve the electrical properties when wet, which has long been the eager hope of users and the inventor. I am here, and the inventor is based on many years of experience in research, development, and sales of insulator coating-related products, and he is thinking about and improving ideas. He has poor personal expertise, and has been researched and designed by many parties. Finally, a high-voltage insulator coating composition was developed to solve the above problems. Rhenium is a main object of the present invention, which is to provide a high-voltage insulator coating composition, according to which a high-voltage insulator coating of an organic polysiloxane,

528785 _case number% 117769_ year month day__ V. Description of the invention (3) It is mainly used for insulation coating of high-voltage barriers above 69KV. A secondary object of the present invention is to provide a high-voltage insulator coating composition. According to the high-voltage insulator coating of the organic polysiloxane rubber, the occurrence of electric leakage and flashover can be suppressed. Yet another object of the present invention is to provide a high-voltage insulator coating composition, according to which a high-voltage insulator coating of an organic polysiloxane rubber, is used to improve its electrical properties during pollution and humidity.

Yet another object of the present invention is to provide a high-voltage insulator coating composition, according to which the high-voltage insulator coating of the organic polysiloxane rubber has greater resistance to electric leakage. The invention provides an organic polysiloxane rubber composition for a high-voltage electronic insulator coating material with improved electrical characteristics under contaminated and humid conditions, and the high-voltage insulator coating composition of the present invention mainly comprises : ^ 1. is a polydifluorene-based silicone fluid, whose chemical formula is HO [(CH3) 2SiO] nH content is 28 to 32% by weight, and its optimal range is 29 to 31% by weight, at 25 ° C The viscosity is 18 to 2 2 Pa.

2. 3 1 ~ 3 55% by weight dry trihydrate bauxite filler, the optimum value is 3 1 ~ 35% by weight, and the particles are 8 to 10 // m and the specific gravity is 2. 42 kg / m appropriate, The bauxite trihydrate contains 65% alumina and 34.5% bound water. 3.2 to 3.6% by weight of a dye paste, the dye may be one of titanium dioxide or acetylene black added to a polydimethylsiloxane fluid and mixed, and the molecular formula of the polydifluorene-based silicone fluid is CH3 [(CH3) 2SiO] nCH3, where η is the degree of polymerization, and its viscosity is 1 Pa at 25 ° C.

Page 6 528785 __ Case No. V. Description of the invention (4) 90117769 Correction agent is oxidized and crushed, the optimal kg / m3, the particles are 0.5 to 4 · 1 · 5 to 2 · 5% by weight reinforced filling The content is 1.5 to 2% by weight, and the specific gravity is 2. 2 1 0 / zm 〇 ′, the optimal value of which is 1.6 to 2ί, wherein R! And R are monovalent carbons of 5.1 to 3% by weight organic Silicon cross-linking dose%, its structural formula is R Ai (CH = CR2) 3, hydrogen group. 6. 0.5 to 1.5% by weight of adhesion promoter, the optimum value is 0% by weight, and its molecular formula is h2n (ch2) 2NH (ch2) 3-Si (0Me) 3, where M 7. 0 08 To 0.15 wt% of the condensation catalyst, its optimum value is 0 to o.ii wt%, and its molecular formula is (c4H9) 2Sn_ (00CCiqH2 () CH3) 2. 8. 25 to 35% by weight of a dry hydrocarbon solvent such as a dispersion medium for a composition as described above. As the organic polysiloxane compound of the present invention, the ingredients are mixed in dry air. 'In humid air, the cross-linking reaction of the water-sensitive stone yakiya will occur, so it must be kept free of water during synthesis. State until the aging reaction, please refer to FIG. 2 which is a flowchart of a preferred embodiment of the present invention; as shown in the figure, the preferred method is to dry the organic polysiloxane 100, and dry the water Bauxite filling 11 0, dye 1 2 0 and solvent 1 3 0 The components were put into a reaction pot in an anhydrous state to react 20 for 15 minutes, and the cross-linking agent 1 4 0 and the adhesion promoter 1 5 0 were subsequently added. Stir for 30 minutes for about 15 minutes. Reinforce the filling material for 16 minutes, then slowly add stirring for 40 minutes for about 15 minutes. Finally, add catalyst 1 70 for another 15 minutes for about 10 minutes. The resulting composition 180 is airtight. Packed in metal cans for storage. In order to make the examiners have a better understanding and understanding of the structural features and the effect achieved by the present invention, I would like to provide detailed explanation ’忒 明 528785

__Case No. 90117769 V. Description of the invention (5) As follows: First, suspend the ceramic insulator in the salt spray test chamber and apply 丨 〇κν (400V / cm) energy. The salt spray comes from the gasified salt water. Its electrical conductivity is 250,000 // S / cm, and the leakage current is monitored by the data collection system, please refer to Figure% ', which is the change in the leakage of the ceramic surface and the particle size of the filling material of Sanshui Xinhua @ 化 图; As shown in the figure, the insulator changes in different average sizes. The filling material of 1 ~ 1m passes the above 40 0V / cm, the time required for the leakage current to occur on the surface of the suspended ceramic insulator layer and the bauxite filling material. The relationship between the average particle size of SU '1 0 1 is 4 · 5 // m, and the leakage time will be within 1000 hours; the particle size of SU-1 0 3 is 9 # m , Its leakage time will be within 2000 ~ 250 hours; the leakage will be within 1 ～ 4, the particle size is 1 3 // m, and its leakage time is within 1000 ~ 150 hours Leakage will occur; the particle size of SU-105 is 1 # m, and its leakage time will be within 100 ~ 50 hours. ; Filling matter will be larger or smaller than the optimum size in a short time lead to a leakage current, so the desired particle size range 8~1 1 // m, 9 // m to the optimum. The organosilicon rubber composition used for the high-voltage insulator insulator coating of the present invention comprises the following steps: Step 1: Polydioxosiloxane with 30% by weight of hydroxyl end groups, at 25 ° C The viscosity is 20Pa, and it is added to 33% by weight, 9 / zm particles and 2.42 kg / m dry mixed dihydrate elephant soil filling. The sanshui clay contains 6 5% of dioxide and 3 4 · 5% bound water; then add 2 · 4% by weight of polydioxosiloxy white dye paste containing titanium dioxide and fluorenyl bundle end groups, with a viscosity of 1 pa at 25 C, and add 30% by weight of dry petroleum spirit solvent 'was slowly mixed for 15 minutes to form a base composition.

Page 8 528785 Case No. 90117769 Amendment V. Description of the invention (6) Step 2: Then add 1.8% by weight of methyl tris- (methyl ethyl ketoxime) silane as an organosilicon crosslinker, and promote adhesion with 0.8% by weight N- (2-aminoethyl-3-aminopropyl) trimeth ο X ysi 1 ane was added to the base composition and mixed for 15 minutes. Step 3: Slowly add 1.9% by weight of reinforced filler S i 0 2 with a specific gravity of 2.2 kg / m, and its particle size is 0.5 to 1.5 m / m, synthesized on the basis of high-speed stirring About 15 minutes. Step 4: Finally, add 0.1% by weight of condensation catalyst disbuty 1 tindi laurate, and stir for about 10 minutes. The resulting composition is an organic polyoxysiloxane rubber composition, and its viscosity ranges from 1 to 25 at 25 ° C. 1 · 5 Pa, Tack Free Time at 25 ° C and 50% relative humidity is 30 minutes and Skin 〇ver Time at 25 ° C and 50% relative humidity is 15 minutes . The organic polyoxysiloxane rubber composition obtained by the invention is stored in a dry metal can as a stable substance in dry air. When it is coated or impregnated by spraying, at-general room temperature Yes, Li Er 2: Gu Yi is an elastomer coating material bonded to the surface of the insulator: = = high voltage insulator coating with resistance to leakage current characteristics. Cai Ya's electrical properties when contaminated or wet @ α 八 ^ Please refer to Figure 4, Figure 5, and Figure 6Η, '不 遭 are affected by the text. The U.S. Patent No. 4,476, 1 5f on the cloth is a study of the change in the leakage current and the salt spray time of the ceramic insulator coating surface. The surface of the organic polysiloxane elastomer coating Leakage current = f, change chart of No. 5, 326, 804; as shown in the figure, the second figure of the table: leakage current and salt spray time ^ 一 · * --- The oral composition was obtained by Dow Corning

And the change in oxygen elasticity of the organic polyliths of the present invention ^ the time of salt service 528785 j No. 90117769 Amendment of the fifth, the description of the invention (7) US Patent No. 4476 1 55 patent scope of the composition, Figure 5 The composition is obtained by CSL si 1 i cones in the scope of the patent of the United States Patent No. 5 3 2 6 8 04. The composition in FIG. 6 is the present invention, and the above composition is painted. The test samples were prepared and tested in a salt spray cavity (conditions of 40 0v / cm and electrical conductivity of 2 500 // S / cm). The results proved that when the coating of the present invention is applied to an insulator, the leakage current The degree is much lower than that of the aforementioned patented formula paint. In summary, the present invention relates to a high-voltage insulation coating group I > 丄, ϋ series application of a room temperature hardening type organic silicone rubber composition, the cross-linking reaction will Voltage insulator surface formation-edge protection] cattle: to improve its electrical properties. Therefore, the invention of this invention ^ should comply with π: None; Sense: r filed an application for an invention patent, Qijun Bureau except the above, is only used to limit the scope of the invention; : The preferred embodiment is just the shape, structure, characteristics, and precision described; the patents should be included in the patent application of the present invention. All of the patents are refined and modified. Brief description: ㈤ 内 ° 100 Organic polysiloxane 110 Dried alumina 120 Dye 130 Solvent 140 Crosslinker 150 Adhesion promoter

Page 10 528785 Case No. 90117769 Amendment V. Description of the invention (8) 16 0 Enhanced filler 1 7 0 Catalyst 1 8 0 Composite 20 Reaction 30 Stirring 40 Stirring 50 Stirring

Page 11 528785 _Case No. 90117769 Rev. Date _ Brief description of the drawing Figure 1: It is the change of the surface leakage and salt spray time of the ceramic layer of the insulator; Figure 2: This is a comparison of the present invention The flow chart of the preferred embodiment; Figure 3: It is a graph showing the change in the leakage of the ceramic surface and the particle size of the trihydrate bauxite filler; Figure 4: It is a ceramic insulator coated with US Patent No. 4,4 7 6, 1 5 5 The change in the surface leakage and the salt spray time of the organic polysiloxane elastomer coating; Figure 5: It is a ceramic insulator coated with US patent case number

5, 3 2 6, 8 0 4 organic silicone elastomer coating surface change in leakage current and salt spray time; and Figure 6: It is a ceramic insulator coated with the organic silicone elastomer of the present invention Change graph of surface leakage of bulk coating and salt spray time.

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Claims (1)

528785 769 _Ά Amendment VI. Patent claims-Wai-L · A high-voltage insulator coating composition mainly comprising: (a) 28 to 32 2% by weight of polydimethylsiloxane; ( b) 3 1 to 35% by weight of dry trihydrate alumina; (c) 2 to 3.6% by weight of a dye paste; (d) 1.5 to 2.5% by weight of a filler; (e) ) 1 to 3% by weight of organospheric crosslinking agent; (f) 0. 5 to 1.5% by weight of adhesion promoter; (g) 0. 0 8 to 0. 15% by weight of condensation catalyst; and (h) ) 5 to 35% by weight of dry hydrocarbon solvent. 2. The coating composition as described in item 1 of the scope of the patent application, wherein the structural formula of the polydioxosiloxane is H0 [(CH3) 2SiO] ηΗ, where η is a degree of polymerization of 4 6 78 Shen Erjia is like Shenzao Sanshui. For example, the optimal content of siloxane based coating composition described in item 1 of the patent application range is 29 ~ 31% by weight. The coating composition described in item 1 of the patent range has a viscosity of 18 to 22 Pa at 25 ° C. The coating composition described in item 1 of the patent, the optimal content of bauxite is 3 1 to 35% by weight. The coating composition described in item 1 of the patent scope, bauxite series, contains 65% of trioxin, which is polymerized, which is polymerized, which is dried, and which is dry aluminum, and the combination of 3.5%. The coating composition described above, wherein the particles of the dried alumina are 8 to 10 / zm. The coating composition according to item 1 of the patent scope, wherein the dry Page 13 528785 _ Case No. 90117769 _ Month and Day __ VI. Scope of patent application The proportion of dry trihydrate bauxite is 2. 42 kg / m3. 9. The coating composition according to item 1 of the scope of the patent application, wherein the dye paste can be selected from one of titanium dioxide and acetylene black and mixed with polydioxosiloxane. 1 0. The coating composition as described in item 7 of the scope of patent application, wherein the viscosity of the dye paste at 25 ° C is 1 Pa. 1 1 · The coating composition as described in item 1 of the scope of patent application, wherein the filler is a reinforced filler S i 0 2, the specific gravity is 2.2 kg / m 3, and the particles are 0.5 to 10 # m. 1〜2. 0 重量 ％。 1 2 · The coating composition as described in the scope of patent application, wherein the optimal content of the filler is 1. 5 ~ 2. 0% by weight. 1〜2. 0 重量 ％。 1 3 as described in the scope of application for a coating composition, wherein the optimal content of the organic stone evening cross-linking agent is 1. 6 ~ 2. 0% by weight. 14. The coating composition as described in item 1 of the scope of patent application, wherein the organic silicon cross-linking agent has a molecular formula RiSUCI1-CR2) 3, where R and R: are monovalent carbon groups. 1〜1. 0 重量 ％。 1 5 · The coating composition as described in the scope of claim 1, wherein the optimum content of the adhesion promoter is 0.6 ~ 1.0% by weight. 16 · The coating composition as described in item 1 of the scope of patent application, wherein the adhesion promoter has a molecular formula of H2N (CH2) 2NH (CH2) 3Si (OMe) 3, where Me is a methyl group. 17 · The coating composition as described in item 1 of the scope of patent application, wherein the optimal content of the condensation catalyst is 0 · 0 8 to 0 · 15% by weight. 1 8 · The coating composition according to item 1 of the scope of patent application, wherein the shrinkage Page 14 528785 _Case No. 90117769_ Year and Month Amendment_ VI. Scope of patent application The co-catalyst system is d i b u t y 11 i n d i 1 a u r a t e. 19 · The coating composition according to item 18 of the scope of application for a patent, wherein the dibutyltindi laurat e system contains an organic tin salt, and its molecular formula is (C4H9) 2Sn (OOCCiOH2〇CH3) 2. 2 0. The coating composition as described in item 1 of the patent application scope, wherein the dry hydrogen-breaking solvent is petroleum brain. 2 1 The coating composition according to item 1 of the scope of patent application, wherein the dry hydrocarbon solvent is mainly used as a dispersion medium of the composition. 2 2 · The coating composition described in item 1 of the scope of patent application, when it is applied to an insulator, is cross-linked by one of spraying, coating and dipping at ordinary room temperature and atmospheric pressure. Reaction to form a bond to. End of chapter Page 15