Method for the manufacture of molded materials

US4631306A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Helmut Markert · Nuremberg, DE
• Klaus-Robert Hauschildt · Nürnberg, DE
• Wolfgang Rogler · Erlangen, DE
• Klaus Kretzschmar · Erlangen, DE

Key dates

• Filing date: Jan 22, 1986
• Grant date: Dec 23, 1986
• Expiry date: Jan 22, 2006

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01B3/40
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

This invention relates to a method for the manufacture of molded material for an insulating component made of a quick-hardening reaction resin which employs a hardening catalyst. An object of the invention is to provide reaction resins which allow the manufacture of molded materials with increased dimensional heat resistance and at the same time, good mechanical properties. According to the invention, a reaction resin mixture of a polyepoxide and a polyisocyanate (EP/IC resin) with a formula mole ratio EP:IC of about 1 to 5 and a viscosity of up to about 7000 mPa.multidot.sec (at 25.degree. C.) is cross-linked under pressure by means of a tertiary amine or imidazole hardening catalyst at a gelling temperature of about 130.degree. to 150.degree. C. and is post-hardened at a temperature of 150.degree. to 200.degree. C. This produces a reaction resin molded material (OX/ICR molding material) containing oxazolidinone and isocyanurate rings with a mole ratio OX:ICR greater than 1 and, after hardening, the reaction of the epoxy and isocyanate groups of the EP/IC resin, is above about 90%.