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Method for preparing high-insulation polyurethane rigid foamed pellets

A polyurethane rigid foam, high-insulation technology, applied in the coating and other directions, can solve the problems of unimproved epoxy resin brittleness, core-burning cracking, low electrical strength, etc., and achieves dense internal filling, excellent electrical insulation performance, and preparation technology. simple effect

Active Publication Date: 2019-02-01
BEIJING INSTITUTE OF TECHNOLOGYGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the glass beads are filled with air, so the electric strength is low, and there is a risk of breakdown; secondly, the material does not improve the brittleness of the epoxy resin itself and the burning caused by the violent heat release during the curing process when the amount is large. core cracking problem

Method used

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  • Method for preparing high-insulation polyurethane rigid foamed pellets
  • Method for preparing high-insulation polyurethane rigid foamed pellets
  • Method for preparing high-insulation polyurethane rigid foamed pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of preparation method of high insulating polyurethane hard foam bead, comprises the following steps:

[0031] (1) 15 parts of tetrahydrofuran-propylene oxide copolyether with brand NG210, 45 parts of refined castor oil, 25 parts of polyether MN500, 12 parts of polyether 4110, 3 parts of diethylene glycol (100 parts in total), CFCl 3 7 parts of foaming agent, 0.6 parts of foam stabilizer AK8882, and 0.4 parts of catalyst A33 are uniformly mixed as component A, and polymerized diphenylmethane diisocyanate (PAPI) is used as component B. The mass ratio of the two is A / B Weigh at 1:0.65 (the molar ratio of [-NCO] to [-OH] is about 1.1), stir rapidly at 3000 rpm for 10-20s with mechanical stirring, and stop stirring after the color of the material is uniform. Quickly pour it into the foaming mold, wait for it to foam, shape and solidify to a density of about 0.20 g / cm 3 Low-density polyurethane rigid foam material;

[0032] (2) Process the prepared polyurethane rigid...

Embodiment 2

[0039] A kind of preparation method of high insulating polyurethane hard foam bead, comprises the following steps:

[0040] (1) 52 parts of refined castor oil, 35 parts of polyether MN500, 10 parts of polyether 4110, 3 parts of diethylene glycol (100 parts in total), CFCl 3 10 parts of blowing agent, 0.6 parts of foam stabilizer AK158, and 0.4 parts of catalyst A33 are uniformly mixed as component A, and polymerized diphenylmethane diisocyanate (PAPI) is used as component B, and the mass ratio of the two is A / B Weigh at 1:0.8 (the molar ratio of [-NCO] to [-OH] is about 1.1), stir rapidly at 2000-3000 rpm for 10-20s with mechanical stirring, and stop stirring after the color of the material is uniform. Pour the material into the foaming mold quickly, wait for it to foam, shape and solidify to become a density of 0.21kg / cm 3 Low-density polyurethane rigid foam material;

[0041] (2) Process the prepared polyurethane rigid foam material into small cubes with a side length of a...

Embodiment （2）

[0044] Prepare high-insulation and low-density polyurethane rigid foam pellets by the method of Example (2), and fill them with a volume of 40%. After stirring evenly with polyurethane resin with good insulation, they are vacuum degassed and poured into insulator mandrel molds. The performance of high insulation lightweight core filling material is as follows:

[0045]

[0046] Take this material as a diameter of 320mm, a wall thickness of 20mm, and a wall material density of 2.2g / cm 3 The core material of the FRP UHV composite insulator can achieve a weight reduction ratio of 51.1%.

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Abstract

The invention discloses a method for preparing high-insulation polyurethane rigid foamed pellet. The method comprises the following steps: (1) uniformly mixing a polyether component containing [-OH],a CFCl3 foaming agent, a foam stabilizer, and a catalyst into a component A, taking a polyfunctional isocyanate component containing [-NCO] as a component B, and performing stirring and foaming to obtain a low-density polyurethane rigid foamed material; processing the material into small balls; performing ball milling to obtain the polyurethane rigid foam pellets; adding polyurethane coated resin,and performing curing to obtain the high-insulation polyurethane rigid foamed pellets. A lightweight core rod prepared by the pellets and the good-insulating polyurethane resin can reduce the weightof the current ultra-high pressure solid core insulator by more than 50%, the pellets have excellent adhesion with a glass fiber reinforced plastic casing, the electrical insulating property is excellent, so that the safety performance of the current ultra-high voltage transmission lines is greatly increased. In addition, the invention has a simple preparation process, which is suitable for industrial mass production.

Description

technical field [0001] The invention belongs to the field of electrical composite materials, and in particular relates to a preparation method of high-insulation polyurethane rigid foam beads. Background technique [0002] Ultra-UHV transmission has significant advantages such as large transmission capacity, long transmission distance, low loss, and saving transmission corridors. At present, my country's ultra-high voltage transmission lines mainly use solid composite insulators, which are formed by epoxy resin and glass fiber through pultrusion process. They have the advantages of simple structure, excellent mechanical tensile strength, non-breakdown, and excellent pollution resistance. There are problems such as epoxy brittleness, large size, bulky, difficult processing, many interface defects, difficult online detection, and poor safety performance. [0003] In order to reduce the weight of UHV solid-core composite insulators and improve their safety performance in prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/36C08G18/32C08J9/36C08J9/14C08G101/00
CPCC08G18/3206C08G18/36C08G18/4804C08G18/4854C08G18/6674C08G18/6696C08G18/7664C08J9/147C08J9/36C08J2203/144C08J2375/08C08G2110/0025
Inventor 邹美帅张旭东郭亚莉李晓东张雄军胡平赵卫生陈玲飞赵亚阁高瑞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY