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Silicon steel water-soluble environment-friendly super thick insulating coating and preparation method thereof

An insulating coating, water-soluble technology, applied in the field of silicon steel water-soluble environmental protection extremely thick insulating coating and its preparation, can solve the problems of not being suitable for large and medium-sized generators, small surface insulation resistance, low thermal compression rate of laminations, etc. , to achieve the effect of good thermal compression resistance, excellent insulation performance and low VOC content

Active Publication Date: 2012-10-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the surface insulation resistance of the above-mentioned coating is too small and the thermal pressure resistance is poor, it is not suitable for large and medium-sized generators. A chromium-free and low-VOC emission C6 water-soluble environmental protection coating, which has high coating solid content and inorganic pigment and filler content (solid content ≥ 60%, inorganic pigment and filler content ≥ 40%, GB / T1725-2007), and excellent surface insulation performance (≥1500Ω.cm 2 / piece, ASTM A717), excellent adhesion (A grade, Ф10mm round rod, GB / T 2522-2007), low thermal compression rate of laminated sheets (heat aging in air at 180℃ for more than 500h), good corrosion resistance (rust rate 0, DIN EN ISO 4628-3), which can better adapt to silicon steel for cutting and stamping of large and medium-sized motors

Method used

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  • Silicon steel water-soluble environment-friendly super thick insulating coating and preparation method thereof
  • Silicon steel water-soluble environment-friendly super thick insulating coating and preparation method thereof
  • Silicon steel water-soluble environment-friendly super thick insulating coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The effects of different pigment and filler contents on the insulation properties of coatings were compared. Examples of the present invention are shown in Table 1. The formula coating solution is applied on the surface of non-oriented silicon steel plate by a roller coater, and baked to form a film under the conditions of a set temperature of 240°C and a heat preservation of 30 minutes (the plate temperature is 240°C) using a box-type muffle furnace. The dry film thickness of one side of the control coating is 5 μm. The coating performance evaluation results are shown in Table 2.

[0056] (Note 1: Evaluation symbols are ◎best; ⊙excellent; ○better; △average; ×poor)

[0057] (Note 2: All the data in the formula table are parts by mass)

[0058] (Note 3: Comparative Example 1 refers to the coating ratio of Chinese Patent Application No. 200710144412.2; Comparative Example 2 refers to the coating ratio of Example 6 in Chinese Patent Application No. 200810207262.X)

[0...

Embodiment 2

[0065] The effects of different resin contents on the general mechanical properties of coatings were compared. The formulation of silicon steel environmental protection extremely thick insulating coating liquid is shown in Table 3. The formula coating solution is coated on the surface of non-oriented silicon steel plate by roller coater, and baked under the conditions of continuous open flame baking furnace, setting the furnace temperature at 280°C, and heating time for 70 seconds (the plate temperature is 270°C). Bake to form a film, and control the dry film thickness of one side of the coating to 5 μm. The coating performance results are shown in Table 4.

[0066] Table 3 Unit: weight percentage

[0067]

Film-forming resin

Cross-linked curing resin

Auxiliary

Organic solvents

pure water

Pigments

Example 5

20

4.8

2

4

24.2

45

Example 6

25

6

2

4

18

45

Ex...

Embodiment 3

[0071] The coating results of Example 1 and Example 2 were formulated to be optimized, and a series of formulations with better comprehensive properties were obtained (Table 5). The properties of insulating coatings obtained from each formulation are shown in Table 6. Apply the coating solution of each formula on the surface of the non-oriented silicon steel plate, and bake it in a continuous open flame baking furnace with the furnace temperature set at 320°C and the heating time at 30 seconds (the plate temperature is 260°C). Film, control the dry film thickness of one side of the coating to 4~6μm. The coating performance results are shown in Table 7. The cured coating is dense and tough, and the SEM photos of its surface are as follows: figure 1 As shown, the surface is smooth, dense, uniform and flat; the cross-sectional SEM photo is shown in figure 2 As shown, the cross-section is dense and the particle size of the inorganic filler is small.

[0072] table 5

[0073] ...

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Abstract

A silicon steel water-soluble environment-friendly super thick insulating coating and a preparation method thereof. The insulating coating comprises the following components, by weight percentage: 10-60% of organic resin containing film-forming resin and crosslinking curing resin; 0.1-5% of inorganic pigment; 28-60% of filler; additives including 0.1-4% of wetting agent, 0.1-4% of dispersing agent, 0.1-1% of defoaming agent in and 0.1-1% of pH regulator; 1-15% of organic solvent; and the balance of pure water. The present invention provides a chrome-free C6 water-soluble environment-friendly coating with low VOC emission. The coating has high solid content and inorganic filler content (solid no less than 60%, inorganic filler content no less than 40%, GB / T 1725-2007), excellent surface insulation performance no less than1500 ohm.cm<2> / tablet (ASTM A717), good attachment (grade class A, phi 10mm rod, GB / T 2522-2007), low lamination heat compression rate, and good corrosion resistance, and is suitable for silicon steel processed with clipping and stamping by large and medium-sized motors.

Description

technical field [0001] The present invention relates to silicon steel coating technology, in particular to a silicon steel water-soluble and environmentally friendly extremely thick insulating coating and its preparation method, which is applied to silicon steel sheets for large and medium-sized generators, and has excellent insulation and punching and shearing processability. Insulating coating with extremely low heat shrinkage. Background technique [0002] Silicon steel products are widely used in the iron core materials of motors and transformers. In order to reduce the short circuit between silicon steel sheets and increase the eddy current loss, it is necessary to coat the surface of silicon steel with an insulating coating. The American ASTMA976-03 standard divides the silicon steel insulation layer into seven categories, C0~C6, among which the C6 insulation coating is an organic-inorganic composite coating, which contains a certain amount of inorganic pigments and fi...

Claims

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Application Information

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IPC IPC(8): C09D5/25C09D163/00C09D167/08C09D161/06C09D167/00C09D133/00C09D175/04C09D127/12C09D183/00C09D125/04C09D133/02C09D161/32C09D7/12
Inventor 李登峰罗勃许云鹏杨勇杰吉亚明赵自鹏黄杰陈卓雷
Owner BAOSHAN IRON & STEEL CO LTD
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