Preparation method for thermal expansion glass felt

A technology of thermal expansibility and glass mat, which is applied in the direction of textiles, papermaking, non-woven fabrics, etc., can solve the problems of good expansion effect, increase the rubber content of the expansion mat, and less environmental pollution, and achieve excellent bonding performance and reduce the preparation process , Improve the effect of paint absorption

Active Publication Date: 2019-01-11
SUZHOU JUFENG ELECTRICAL INSULATION SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are that on the one hand, the environmental protection is poor, and pollution will be generated during the production process; on the other hand, after the expansion material is expanded, the amount of paint absorbed when dipping paint is small, and the expansion rate is low; It is easy to puncture the hand, and then cause allergies; and the thickness of the single layer of glass mat made of disordered hard glass fiber can reach 2mm. In order to meet the actual production needs, only the method of multi-layer superposition can be used. However, this method increases the rubber content of the expansion felt, and the expansion rate is low
[0005] However, the glass mats in the above-mentioned patents are all made of multi-layer glass mat blanks, which cannot meet the requirements of small glue consumption, low environmental pollution, and good expansion effect for thermally expandable glass mats in actual production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of heat-expandable glass mat, comprising the steps of:

[0041] The thickness is 15mm, the density is 0.08g / cm 3 The glass fiber felt is dipped, squeezed, dried, cut into pieces, and hot-pressed to obtain a thermally expandable glass felt; wherein, the needle-punched density of the glass fiber is 220 needles m 2 , the radial breaking strength is 2420N, and the weft breaking strength is 2420N; the radial elongation at break is 3.6%, and the weft elongation at break is 3.6%; the glass fiber used in the glass fiber mat is short fiber, and the fiber length is 35mm;

[0042] The diameter of the glass fiber used in the glass fiber mat is 10 μm;

[0043] The glue solution used for the dipping is 5% by weight polyvinyl acetal ethanol solution.

[0044] The extrusion process maintains a temperature of 40°C and a pressure of 2Mpa for 3 minutes;

[0045] The drying temperature is 70°C for 6 hours;

[0046] The hot pressing process maintains a temperature o...

Embodiment 2

[0048] A preparation method of heat-expandable glass mat, comprising the steps of:

[0049] The thickness is 15mm, the density is 0.08g / cm 3 The glass fiber felt is dipped, squeezed, dried, cut into pieces, and hot-pressed to obtain a thermally expandable glass felt; wherein, the needle punching density is 280 needles m 2 , the radial breaking strength is 2450N, the weft breaking strength is 2450N; the radial breaking elongation is 3.2%, and the weft breaking elongation is 3.2%;

[0050] The glass fiber used in the glass fiber mat is short fiber, and the fiber length is 35mm;

[0051] The diameter of the glass fiber used in the glass fiber mat is 10 μm;

[0052] The glue solution used for the dipping is 5% by weight polyvinyl acetal ethanol solution.

[0053] The extrusion process maintains a temperature of 40°C and a pressure of 2Mpa for 3 minutes;

[0054] The drying temperature is 70°C for 6 hours;

[0055] The hot pressing process maintains a temperature of 130° C. an...

Embodiment 3

[0057] A preparation method of heat-expandable glass mat, comprising the steps of:

[0058] The thickness is 15mm, the density is 0.14g / cm 3 The glass fiber felt is dipped, squeezed, dried, cut into pieces, and hot-pressed to obtain a thermally expandable glass felt; wherein, the needle-punched density of the glass fiber is 220 needles m 2 , the radial breaking strength is 2440N, and the latitudinal breaking strength is 2440N; the radial elongation at break is 3.4%, and the weft elongation at break is 3.4%; the glass fiber used in the glass fiber mat is short fiber, and the fiber length is 35mm;

[0059] The diameter of the glass fiber used in the glass fiber mat is 10 μm;

[0060] The glue solution used for the dipping is 5% by weight polyvinyl acetal ethanol solution.

[0061] The extrusion process maintains a temperature of 40°C and a pressure of 2Mpa for 3 minutes;

[0062] The drying temperature is 70°C for 6 hours;

[0063] The hot pressing process maintains a temperat...

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Abstract

The invention belongs to the technical field of electrical insulating materials, and specifically relates to a preparation method of thermal expansion glass felt. The method comprises the steps of carrying out glue dipping, glue extruding, drying and clipping on glass fiber felt, wherein the glass fiber felt is single-layer needled glass fiber felt, and the thickness is 8-20mm. According to the thermal expansion glass felt provided by the invention, firstly glass fibers are manufactured into soft needled glass felt in the form of needling, and then the glass felt is subjected to the processessuch as glue dipping and glue extruding, so that multi-layer superposition is not required, and the preparation process is simplified. In addition, the thickness of the glass fiber felt is improved, the glue content of the glass felt is reduced, the expansion rate of the expansion felt is improved, and thus the paint absorbing amount after paint dipping is improved.

Description

technical field [0001] The invention belongs to the technical field of electrical insulating materials, and in particular relates to a preparation method of thermally expandable glass felt. Background technique [0002] In common large-scale motors, the gaps in the motor slots, between adjacent coils, and between the magnetic pole coils and the core need to be filled with a pad or liner to fill the gaps. The commonly used packing material in the prior art is heat-expandable felt, which is a glass felt formed by stacking multiple layers of glass fibers and then rolled. It is impregnated and pressed, and has the property of expanding after heating. The product is made of disordered non-alkali glass fiber to make glass mat, then impregnated with toluene, xylene, acetone as a solvent to prepare the glue, and finally dried and pressed to shape. The disadvantages are that on the one hand, the environmental protection is poor, and pollution will be generated during the production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4218D04H1/488D04H1/645D04H1/587
CPCD04H1/4218D04H1/488D04H1/587D04H1/645
Inventor 张平夏宇周成汝国兴
Owner SUZHOU JUFENG ELECTRICAL INSULATION SYST
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