Low-shrinkage epoxy resin as well as preparation method and application thereof

A low-shrinkage epoxy resin and epoxy resin technology, applied in the field of polymer material preparation, can solve the problems of volume resistivity, tracking resistance, arc resistance, low thermal expansion, etc., and achieve superior process operability, reduce shrinkage, shrinkage small effect

Inactive Publication Date: 2021-11-12
GUANGDONG SIHUI INSTR TRANSFORMER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cured product of the epoxy resin composition of the invention has excellent properties such as heat resistance, mechanical strength, high and low temperature impact resistance, crack resistance and electrical insulation; it can be widely used in high-voltage power insulation such as insulating switches, power transmission devices, Insulation devices such as circuit breakers, disc insulators, support insulators, and power insulation rods have good market prospects, but the application did not study the yellowing resistance and shrinkage properties of the obtained epoxy resin
[0004] Chinese patent application 201410412657.9 discloses a modified epoxy resin composition for outdoor electrical insulation, which includes epoxy resin, curing agent, curing accelerator and inorganic filler; the epoxy resin is a modified epoxy resin The mass percentage is 50-80%, and the rest is a mixed epoxy resin of unmodified epoxy resin or 100% modified epoxy resin; the modified epoxy resin is modified with a silicone modifier The epoxy resin that has been passed, the curing agent is selected from the bisanhydride curing agent, including methyl tetrahydrophthalic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyl hexahydrophthalic anhydride, methyl nadic anhydride One or a mixture of several kinds; the inorganic filler is one or a mixture of several selected from silica, alumina, magnesia, aluminum hydroxide, magnesium hydroxide, etc.; the outdoor electrical insulation improvement The non-toxic epoxy resin composition has excellent properties such as high weather resistance, excellent hydrophobicity, high volume resistivity, high resistance to tracking, high resistance to arcing, and low thermal expansion. It can be used to make suspension insulators for AC transmission lines, Compared with silicone rubber sheds, umbrella skirts for outdoor insulating parts such as crossarms can prevent bird pecks, resist trampling on patrol lines, and avoid transportation damage. Performance and shrinkage properties are studied

Method used

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  • Low-shrinkage epoxy resin as well as preparation method and application thereof
  • Low-shrinkage epoxy resin as well as preparation method and application thereof
  • Low-shrinkage epoxy resin as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0035] Embodiment 1 A kind of low-shrinkage epoxy resin, comprises the raw material of following weight part:

[0036] raw material components content Solid bisphenol A epoxy resin - 90 Hardener Modified hexahydrophthalic anhydride 45 antioxidant Antioxidant 703 0.2 filler Electrical alumina filler 330

[0037] Among them, the epoxy equivalent of bisphenol A epoxy resin is 185eq / 100g; the viscosity at 25°C is 2234mPas.

[0038] Preparation method: comprising the following steps:

[0039] (1) First, melt the solid bisphenol A epoxy resin at 130±5°C and set aside; add bisphenol A epoxy resin with 100 times the amount of antioxidant 703 to the antioxidant 703 in the formula, and stir at a high speed Mixer disperses evenly to obtain mixture 1; Add mixture 1 to the mixing tank filled with remaining bisphenol A epoxy resin, stir and disperse evenly to obtain mixture 2;

[0040] (2) Add the electrical alumina filler pre-baked at 130±5...

Embodiment 2

[0042] Embodiment 2 A kind of low-shrinkage epoxy resin, comprises the raw material of following weight portion:

[0043] raw material components content Solid bisphenol A epoxy resin - 120 Hardener Modified hexahydrophthalic anhydride 50 antioxidant Antioxidant 703 0.5 filler Electrical alumina filler 360

[0044] Among them, the epoxy equivalent of bisphenol A epoxy resin is 196eq / 100g; the viscosity at 25°C is 2486mPas.

[0045] Preparation method: comprising the following steps:

[0046] (1) First, melt the solid bisphenol A epoxy resin at 130±5°C and set aside; add bisphenol A epoxy resin with 100 times the amount of antioxidant 703 to the antioxidant 703 in the formula, and stir at a high speed Mixer disperses evenly to obtain mixture 1; Add mixture 1 to the mixing tank filled with remaining bisphenol A epoxy resin, stir and disperse evenly to obtain mixture 2;

[0047] (2) Add the electrical alumina filler pre-baked at 1...

Embodiment 3

[0049] A kind of low-shrinkage epoxy resin of embodiment 3 comprises the raw material of following weight part:

[0050] raw material components content Solid bisphenol A epoxy resin - 110 Hardener Modified hexahydrophthalic anhydride 48 antioxidant Antioxidant 703 0.4 filler Electrical alumina filler 350

[0051] Among them, the epoxy equivalent of bisphenol A epoxy resin is 183eq / 100g; the viscosity at 25°C is 2342mPas.

[0052]Preparation method: comprising the following steps:

[0053] (1) First, melt the solid bisphenol A epoxy resin at 130±5°C and set aside; add bisphenol A epoxy resin with 100 times the amount of antioxidant 703 to the antioxidant 703 in the formula, and stir at a high speed Mixer disperses evenly to obtain mixture 1; Add mixture 1 to the mixing tank filled with remaining bisphenol A epoxy resin, stir and disperse evenly to obtain mixture 2;

[0054] (2) Add the electrical alumina filler pre-baked at 130...

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Abstract

The invention provides low-shrinkage epoxy resin as well as a preparation method and application thereof, and belongs to the technical field of high polymer material preparation. The low-shrinkage epoxy resin comprises the following raw materials in parts by weight: 90-120 parts of solid bisphenol A epoxy resin; 45-50 parts of a curing agent; 0.2-0.5 parts of an antioxidant; and 330-360 parts of a filler. The bisphenol A epoxy resin is adopted as a raw material to prepare the epoxy resin, the shrinkage rate of a cured product is small, and the obtained epoxy resin is stable in size and high in precision. Modified hexahydrophthalic anhydride is adopted as a curing agent, so that the use amount of the filler is increased, the shrinkage rate of the cured product is effectively reduced, and the product is stable in size and high in precision. The antioxidant capable of being subjected to an addition reaction with epoxy resin is adopted as an anti-yellowing agent, and the original necessary performance of the product is not influenced while an anti-yellowing effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a low-shrinkage epoxy resin and its preparation method and application. Background technique [0002] Most of the existing high-voltage epoxy resin products are prepared by curing and molding epoxy resin composite materials cured at medium and high temperatures, especially for insulating parts used in GIS combined electrical appliances, most of them use epoxy resin with relatively large molecular weight, It is formed by mixing reaction of acid anhydride curing agent and alumina powder filler. Due to the influence of alumina in the component, the color of the newly prepared product will be white; but because most of the organic polymerization reactions are incomplete reactions, there will be presence in epoxy polymers. There are free molecular groups, and the polymer also has an active molecular structure. They are prone to oxidation reactions and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K3/22C08K5/17C08G59/62
CPCC08K3/22C08K5/17C08G59/62C08K2003/2227C08L2201/08C08L63/00
Inventor 张丽珍徐梁山张树华
Owner GUANGDONG SIHUI INSTR TRANSFORMER WORKS
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