Epoxy resin coil for transformer and processing technology of epoxy resin coil

A technology of epoxy resin and processing technology, which is applied in the field of epoxy resin, can solve the problems of reducing the service life of epoxy resin, poor impact damage resistance, and high brittleness of epoxy resin, so as to promote the curing process, increase toughness, increase The effect of the degree of crosslinking

Active Publication Date: 2021-05-14
ZHONGBIAN GRP SHANGHAI TRANSFORMER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, epoxy resin has high brittleness and poor toughness, which leads to poor impact damage resistance, reduces the service life of epoxy resin, and limits its application.

Method used

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  • Epoxy resin coil for transformer and processing technology of epoxy resin coil
  • Epoxy resin coil for transformer and processing technology of epoxy resin coil
  • Epoxy resin coil for transformer and processing technology of epoxy resin coil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] S1: Preparation of multi-component composite cellulose:

[0027] (1) Stir and disperse the cellulose in a stirred reactor containing deionized water to form a 2wt% cellulose solution; under a nitrogen atmosphere, add 0.6mol / L urea solution to dissolve the cellulose, and set the stirring speed to 600rmp , the heating temperature is 150°C, and the dissolution time is 1 hour to form a dispersion; slowly add phosphoric acid-citric acid mixed acidic solution, continue to react for 7 hours, rotary evaporate, use ethanol and deionized water to wash to PH = 7, and use methanol to wash , vacuum-dried at 30-40°C, and ground to obtain multi-component composite cellulose A.

[0028] (2) Ultrasonically disperse multi-component composite cellulose A in deionized water, add ferric chloride hexahydrate solution dropwise, set stirring speed to 200rmp, complexation time to 4 hours, centrifugally wash, dry at 50°C for 8-12 hours, place Dry thoroughly in a freeze dryer with a temperature ...

Embodiment 2

[0031] S1: Preparation of multi-component composite cellulose:

[0032] (1) Stir and disperse the cellulose in a stirred reactor containing deionized water to form a 2wt% cellulose solution; under a nitrogen atmosphere, add 0.6mol / L urea solution to dissolve the cellulose, and set the stirring speed to 400rmp , the heating temperature is 145°C, and the dissolution time is 1 hour to form a dispersion; slowly add phosphoric acid-citric acid mixed acidic solution, continue to react for 5 hours, rotary evaporate, use ethanol and deionized water to wash to PH = 7, and use methanol to wash , vacuum-dried at 30° C., and ground to obtain multicomponent composite cellulose A.

[0033] (2) Ultrasonically disperse the multi-component composite cellulose A in deionized water, add ferric chloride hexahydrate solution dropwise, set the stirring speed to 200rmp, and the complexing time to 4 hours, centrifugally wash, dry at 50°C for 8 hours, and place in the freezer The drying machine is se...

Embodiment 3

[0036] S1: Preparation of multi-component composite cellulose:

[0037] (1) Stir and disperse the cellulose in a stirred reactor containing deionized water to form a 2wt% cellulose solution; under a nitrogen atmosphere, add 0.6mol / L urea solution to dissolve the cellulose, and set the stirring speed to 600rmp , the heating temperature is 155°C, the dissolution time is 1 hour, and a dispersion liquid is formed; slowly add phosphoric acid-citric acid mixed acidic solution, continue to react for 7 hours, rotary evaporate, use ethanol and deionized water to wash to PH = 8, and use methanol to wash , vacuum-dried at 40° C., and ground to obtain multicomponent composite cellulose A.

[0038] (2) Ultrasonically disperse the multi-component composite cellulose A in deionized water, add ferric chloride hexahydrate solution dropwise, set the stirring speed to 400rmp, and the complexing time to 5 hours, centrifugally wash, dry at 60°C for 12 hours, and place in the freezer The drying ma...

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Abstract

The invention discloses an epoxy resin coil for a transformer and a processing technology of the epoxy resin coil. The epoxy resin coil comprises the following raw materials in parts by weight: 80-100 parts of bisphenol A epoxy resin, 8-18 parts of multi-element composite cellulose and 75-90 parts of a curing agent. The epoxy resin coil has the following beneficial effects: the additive multi-element composite cellulose is used as a flexibilizer, an accelerant and a flame retardant; by utilizing esterification reaction of citric acid and cellulose, the abundance of carboxyl in multi-element composite cellulose is increased, so that the crosslinking degree between the filler and epoxy resin is increased, and the toughness, tensile strength and other mechanical properties of an epoxy resin coil are improved; by utilizing esterification and etherification reaction between phosphoric acid and cellulose, metal iron ions are complexed, a carbonization layer is formed through effective catalysis, and synergistic flame retardance is achieved; and by utilizing abundance of carboxyl in the multi-element composite cellulose and a byproduct citrate,the curing process is promoted. The epoxy resin coil is simple in formula components and low in price, and industrialization can be achieved.

Description

technical field [0001] The invention relates to the technical field of epoxy resin, in particular to an epoxy resin coil for a transformer and a processing technology thereof. Background technique [0002] Epoxy resin is a thermosetting polymer material with good corrosion resistance and good insulation. It can be cross-linked under the action of a curing agent to form a three-dimensional network polymer, which is tightly combined with the coil by its viscosity. Therefore, it has been widely used in the field of transformers. However, epoxy resin has relatively high brittleness and poor toughness, which leads to poor impact damage resistance, reduces the service life of epoxy resin, and limits its application. Generally, a toughening agent is added to modify the epoxy resin to improve the mechanical properties of the epoxy resin; and the epoxy resin is a flammable substance. For the stability of the transformer, it is necessary to add a flame retardant to improve the resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L1/20C08B15/05C08B7/00
CPCC08B7/00C08B15/05C08L63/00C08L2201/02C08L1/20
Inventor 黄伟
Owner ZHONGBIAN GRP SHANGHAI TRANSFORMER CO LTD
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