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Polysulfonamide fiber-containing dry mica tape and application thereof

A technology of polyaryl sulfone fiber and mica tape, which is applied in the direction of single-component copolyamide artificial filament, shape/style/structure of winding insulation, layered products, etc. Insufficient thermal mechanical properties of insulating structures, etc., to achieve excellent electrical insulation performance, improved air permeability, and improved thermal mechanical strength

Inactive Publication Date: 2012-01-25
上海同立电工材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The less-adhesive powder mica tape produced by the domestic existing technology generally has the disadvantages of poor air permeability and insufficient thermal mechanical properties of the insulating structure after being treated and cured by VPI resin.
Existing technologies cannot fully meet actual needs

Method used

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  • Polysulfonamide fiber-containing dry mica tape and application thereof
  • Polysulfonamide fiber-containing dry mica tape and application thereof
  • Polysulfonamide fiber-containing dry mica tape and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] like Figure 1-2 As shown, a kind of rubber-less powder mica tape containing polyarylsulfone fiber, from top to bottom is successively mica layer 1, adhesive layer 3 and reinforcing material layer 2, wherein, mica layer 1 is made of powder mica and polyphenylsulfone It is composed of terephthalamide fibers, and a small amount of adhesive exists in the mica layer 1.

[0040] The adhesive is epoxy-modified polyester adhesive.

[0041] The manufacturing method of the above-mentioned product is: quantitatively 160g / m 2 Non-calcined muscovite paper (which contains 10g / m 2 Polyarylene sulfone fiber, the average diameter of the fiber is 9μm, the average length is 3.5mm), the basis weight is 22g / m 2 Alkali-free fixed-grain glass cloth, the mica paper and glass cloth are bonded with an epoxy modified polyester adhesive to produce a mica tape containing polyarylene sulfone fiber and less rubber powder, wherein the adhesive content is 8% of the total weight of the mica tape. %...

Embodiment 2

[0057] The sample A mica tape in Example 1 was wrapped on an aluminum strip wire rod (12mm×40mm×800mm) in the form of half-folded wrapping, with 18 layers of wrapping, and the insulating ends of the wrapping were sealed. Immerse the unsaturated polyester-epoxy-acid anhydride-styrene type impregnation resin, the impregnation pressure is 0.6MPa, and the impregnation time is 3 hours. The impregnated wire rod is baked and solidified. Take part of the sample for cutting and dissection to measure its immersion depth. This sample was designated as sample C.

[0058] Using the sample B mica tape in Example 1, a simulated wire rod was made in the same manner as above, and a part of the sample was taken for cutting and dissection to measure its immersion depth. This sample was designated as sample D.

[0059] The comparison results are shown in Table 2 below.

[0060]

[0061] It can be seen from the above table that with the same VPI treatment process, the same impregnating resi...

Embodiment 3

[0064] Wrap the adhesive tape of sample A in Example 1 on an iron plate coated with a release agent, wrap 10 layers, use the impregnated resin and VPI process in Example 2, bake and solidify, and cut into a certain size. The size of the sample, as sample E.

[0065] The sample B-less adhesive tape in the embodiment was made into a sample in the same manner as above, and this was taken as sample F.

[0066] Samples E and F were tested for flexural strength at different temperatures. The test results are shown in Table 3.

[0067] table 3

[0068] Sample E Sample F test temperature Bending strength (MPa) Bending strength (MPa) 23℃ 230.8 227.8 80℃ 83.6 65.2 130℃ 43.0 27.2 155℃ 40.1 25.6 180℃ 31.0 20.0

[0069] The test results show that the hot flexural strength and thermal flexural strength retention rate of the sample made with the adhesive tape containing polysulfone fiber are significantly highe...

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Abstract

The invention discloses a polysulfonamide fiber-containing dry mica tape, which comprises a mica layer, a bonding agent layer and a reinforcing material layer in sequence from the top to the bottom, wherein the mica layer consists of mica powder, polyphenyl sulfone p-phenylene formamide fiber and a bonding agent; the content of the polyphenyl sulfone p-phenylene formamide fiber accounts for 2-50 percent by weight of total mass of the mica layer; and the content of the bonding agent accounts for 2-25 percent by weight of the total mass of the mica tape. The invention has the remarkable technical advantages that: 1, the dry mica tape has high permeability; in the presence of the polysulfonamide fiber, a relatively loose structure and gaps with certain continuity can be formed in an insulating layer, so that the permeability of the dry mica tape can be improved, and impregnation of impregnated resin is better facilitated; 2, heat-resisting organic fiber in a certain proportion is added into the mica layer, namely, the mechanical strength of the mica layer is improved; and 3, heat-resisting organic fiber used in the mica tape is superior to Nomex fiber on the aspects of heat resistance, impregnating performance, radiance resistance, high-temperature size stability, flame retardance and chemical stability, has excellent electrical insulating performance simultaneously, and is more suitable for manufacturing a mica type with a motor in an insulating way than Nomex fiber.

Description

technical field [0001] The invention relates to a mica tape with less rubber powder containing polyarylsulfone fiber (also known as polyphenylsulfone terephthalamide) fiber, and relates to the application of this mica tape in the main insulation of high temperature-resistant motors and large generators . Background technique [0002] In recent years, with the increasingly widespread production and application of various high-temperature-resistant motors and large water wheels and turbogenerators, higher and higher requirements have been put forward for the corresponding insulation manufacturing technology and insulation materials. [0003] Vacuum pressure impregnation (VPI) technology is increasingly accepted by domestic motor manufacturers for its many advantages. It mainly uses two kinds of insulation materials, glue-less mica tape and VPI impregnated resin. The treatment process mainly uses a small amount of tape to continuously wrap the conductor coil or wire rod of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B19/02D01F6/80H02K3/34
Inventor 倪永庆卜一民戴鹏
Owner 上海同立电工材料有限公司
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