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High-toughness polyurethane composite insulator core rod and preparation method thereof

A composite insulator and polyurethane technology, applied in the field of insulator mandrels, can solve the problem that composite insulator mandrels can only be used in suspension, and achieve the effects of strong bending resistance, fast production speed and improved production efficiency

Active Publication Date: 2012-06-20
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a high-toughness polyurethane composite insulator mandrel and its preparation method. Under the premise of ensuring the tensile strength of the mandrel, the toughness of the mandrel is improved, which can effectively solve the problem that the mandrel of the composite insulator can only be used in suspension. The mandrel placed horizontally will not break when it bears the vertical load of human body weight; the preparation method of the present invention can realize rapid production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The preparation process of the polyurethane / glass fiber insulator mandrel of the present embodiment is as follows:

[0049] The polyurethane raw material is 4,4-diphenylmethane diisocyanate (MDI) polyether polyol, dehydrated in vacuum at 110 degrees for 3 hours, and the cross-linking chain extender is trimethylol propane, dehydrated in vacuum at 90 degrees for 2 hours. Add excess 4,4-diphenylmethane diisocyanate to the vacuum mixing equipment, add polyether polyol under stirring and react for 0.5h to form A component, vacuum degassing, then add polyether polyol, cross-linking chain extender three Hydroxymethyl propane is uniformly degassed and mixed to form component B. After mixing A and B for 3 minutes, it enters the glue tank from the discharge port. The temperature of the glue tank is cooled to maintain a low temperature of 5°C. After the glass fiber is fully impregnated in the vibrating glue tank , is quickly introduced into a 170°C, 18mm-diameter molding mold by a...

Embodiment 2

[0051] The preparation process of the polyurethane / glass fiber insulator mandrel of the present embodiment is as follows:

[0052] The polyurethane raw material is 4-4 dicyclohexylmethane diisocyanate and polyether polyol, vacuum dehydrated at 110 degrees for 3.5 hours, and the cross-linking chain extender is glycerol, and vacuum dehydrated at 90 degrees for 2.5 hours. Add excess 4-4 dicyclohexylmethane diisocyanate to the vacuum mixing equipment, add polyether polyol under stirring and react for 0.2h to form A component, vacuum degassing, then add polyether polyol, cross-linking chain extender C The triols are evenly degassed and mixed to form component B. A and B are mixed for 4 minutes and then enter the glue tank from the discharge port. The temperature of the glue tank is cooled and kept at a low temperature of 8°C. After the 24k glass fiber is fully impregnated in the vibrating glue tank, It is quickly introduced into a 180°C forming mold with a diameter of 24mm by a tra...

Embodiment 3

[0054] The preparation process of the polyurethane / glass fiber insulator mandrel of the present embodiment is as follows:

[0055] The raw material of polyurethane is 1-4 trans-cyclohexane diisocyanate, polyether polyol, vacuum dehydration at 110 degrees for 4 hours, the cross-linking chain extender is glycerol, and vacuum dehydration at 90 degrees for 3 hours. Add a chemical dose of 1-4 trans-cyclohexane diisocyanate into the vacuum mixing equipment, under nitrogen protection, add polyether polyol to react for 30 minutes under stirring, vacuum degassing, then add polyether polyol, filler nano-titanium dioxide and expander After the chain agent is evenly degassed, the two are mixed for 5 minutes and then enter the glue tank from the discharge port. The temperature of the glue tank can be kept at a low temperature of 10°C with cooling liquid. After winding and wrapping a layer of laid-free glass fiber cloth prepreg, it is quickly introduced into a molding mold with a diameter o...

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Abstract

The invention provides a high-toughness polyurethane composite insulator core rod and a preparation method thereof, belonging to the field of insulator core rods for power grid transmission lines. The core rod is prepared by adopting a rapid drawing and extruding process. On the premise of ensuring the tensile strength, the toughness of the core rod is increased, so that the problems that the composite insulator core rod can be used only in an overhung manner and cannot be pedalled by constructors can be effectively solved. On the premise of ensuring practical application in terms of a mechanical property and an electric property, the core rod disclosed by the invention has the characteristics of being rapid in forming speed, high in production efficiency, good in anti-aging property and long in fatigue service life; therefore, the occurring rate of brittle fracture accidents of the insulator core rod can be reduced, and application of a composite insulator in strain insulator-string of a transmission line can be expanded.

Description

technical field [0001] The invention belongs to the field of insulator mandrels for power grid transmission lines, and in particular relates to a high-toughness polyurethane composite insulator mandrel and a preparation method thereof. Background technique [0002] Composite insulator is a kind of insulation control with excellent performance, which plays an important role in overhead transmission lines. Composite insulator mainly includes: resin-based composite material mandrel, synthetic material sheath, fittings and silicone rubber sheath, in which the mandrel acts as To the role of internal insulation and transfer of mechanical load, the silicone rubber umbrella cover plays the role of outer insulation, and the metal fittings play the role of connecting both ends, of which the role of the mandrel is the most important. There are two types of mandrels: solid mandrel and hollow mandrel, and the solid mandrel includes suspension composite insulators, column composite insula...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08K7/00C08K7/14C08K3/34C08K3/22C08G18/48
Inventor 兰逢涛陈新何州文刘辉张卓
Owner CHINA ELECTRIC POWER RES INST
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