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Preparation method of two-component corona-proof high-resistance paint
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An anti-corona paint and anti-corona technology, which is applied in coatings, epoxy resin coatings, etc., can solve the problems of poor adhesion between paint and wire rods and winding surfaces, short storage life, and falling off, so as to improve storage Stability, enhanced environmental resistance, and improved storage life
Inactive Publication Date: 2014-01-08
HARBIN ELECTRIC MASCH CO LTD
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[0003] At present, the high-resistance anti-corona paints that are domestically produced and used are all one-component air-drying high-resistance anti-corona paints. The paint base is epoxy ester or polyester air-drying paints. They have extremely high requirements for container sealing and storage conditions. short shelf life
At the same time, because it is an air-drying paint, if the coating is too thick, or sprayed on an absorbent surface, the underlying anti-halation paint will be extremely difficult to cure, which will greatly affect the adhesion and anti-halation performance of the wire rod or winding surface
This kind of paint has poor adhesion to the wire rods and winding surfaces, and is not fully cured at room temperature. It is easy to fall off during the assembly process of the stator wire rods or cause the paint base to fail and decompose due to various corrosions during the operation of the motor. The ingredients contained to improve the potential gradient distribution at the end fall off, which eventually leads to the burning of the end of the winding due to corona corrosion
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preparation example Construction
[0009] The preparation method of two-component anti-corona high-resistance paint, the preparation method of anti-corona paint is realized according to the following steps:
[0010] 1. Preheat the epoxy resin to 35-40°C, add a mixed solvent composed of toluene, alcohol and acetone to the epoxy resin, the mass ratio of the mixed solvent to the epoxy resin is 0.5-0.8:1, in the mixed solvent, The mass ratio of toluene, alcohol, and acetone is 1:1:1. After stirring evenly, add siliconcarbidepowder. The mesh number of siliconcarbidepowder is 1200 mesh to 1800 mesh. The mass ratio of silicon carbide powder to epoxy resin is 1.5~ 4:1, stir for 15-30 minutes to make anti-corona paint base;
[0011] Two, take the polyamide resin whose quality and epoxy resin mass ratio is 0.4-0.6:1, add the mixed solvent that toluene, alcohol, acetone are formed in polyamide resin, the mass ratio of mixed solvent and polyamide resin is 0.5- 0.8:1, in the mixed solvent, the mass ratio of toluene, al...
specific Embodiment approach 1
[0014] Specific embodiment one: the preparation method of the two-component anti-corona paint of the present embodiment is implemented according to the following steps:
[0015] 1. Preheat 200g of epoxy resin to 40°C, and add a mixed solvent composed of toluene, alcohol and acetone to the epoxy resin. The quality of mixed solvent is 150g. In the mixed solvent, the mass of toluene, alcohol and acetone are respectively 50g, after stirring evenly, add 600g of 1200 mesh silicon carbide powder, and stir for 20 minutes to make anti-corona paint base;
[0016] 2. Weigh 100g of polyamide resin, and add a mixed solvent of toluene, alcohol and acetone into the polyamide resin, and the quality of the mixed solvent is 75g. In the mixed solvent, the masses of toluene, alcohol, and acetone are 25g respectively. Stir the solution composed of polyamide resin and mixed solvent evenly to make curing agent;
[0017] 3. Add the curing agent obtained in step 2 into the anti-corona paint paint b...
specific Embodiment approach 2
[0018] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the particle size of the silicon carbide powder in Step 1 is 1800 mesh. Other steps and parameters are the same as those in Embodiment 1.
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Abstract
The invention relates to a preparation method of two-component corona-proof high-resistance paint. Firstly, heating temperature is controlled, epoxy resin is mixed with a mixed solvent comprising toluene or xylene, alcohol and acetone with the toluene or xylene to alcohol to acetone of 1:1:1, siliconcarbidepowder is added for preparation of a corona proof paint binder; secondly, polyamide resin is added into the mixed solvent comprising the toluene or xylene, the alcohol and the acetone with the toluene or xylene to alcohol to acetone of 1:1:1 to prepare a curing agent; and thirdly, the curing agent is added to the corona proof paint binder to obtain the corona proof paint by stirring. According to the two-component corona-proof high-resistance paint, the curing agent and the binder are separately packed and stored, the storage stability is improved, and the storage life is increased from 6 months to 12 months. A corona proof paint coating with the thickness greater than 2mm can be completely cured within 48h at room temperature, and the preparation method is mainly applied to the preparation of the corona proof paint.
Description
technical field [0001] The invention relates to a preparation method of a two-component anti-corona high-resistance paint. Background technique [0002] A trend in the development of generators is that the voltage level is getting higher and higher, and the capacity is getting bigger and bigger, especially for large-scale air-cooled units, which puts forward new requirements for anti-corona materials for stator windings, not only the corona inception voltage requirements for a single stator bar Higher, and the end of the stator winding cannot be burned due to corona action during operation. One way to meet this requirement is to apply a layer of high-resistance anti-corona paint on the end surface of the wire bar after forming, and spray a layer of high-resistance anti-corona paint on the end surface of the stator winding. [0003] At present, the high-resistance anti-corona paints that are domestically produced and used are all one-component air-drying high-resistance anti...
Claims
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Application Information
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