RU2422273C1 - Method of forming articles from epoxy resin - Google Patents

Abstract

FIELD: process engineering. ^ SUBSTANCE: invention relates to processing of polymer composite materials and may be used for producing articles from epoxy-resin-based binder, for example, radial flow blower impeller. Proposed method comprises binder preprocessing, billet hardening and mechanical processing. Note here that binder preprocessing is carried out in liquid phase by nanosecond electromagnetic pulses and electromagnetic mixing. Nanosecond electromagnetic pulses of 1 ns duration are used with amplitude varying from 8 to 12 kV. Power of one pulse varies from 1 to 2 MW, pulse repetition rate making 1000 Hz and processing interval varying from 25 to 35 min. ^ EFFECT: higher physical-mechanical properties. ^ 2 cl, 1 dwg, 1 ex

Description

The invention relates to a technology for processing polymer composite materials and can be used for the manufacture of products from a binder based on epoxy resin, for example, impellers of machines such as a centrifugal air blower.

A known method of manufacturing products from epoxy resin, including molding, curing and machining of the workpiece (application No. 94015074/26, B29C 41/04, publication date 02/27/1996).

The specified method is time-consuming and complicated due to imperfection of technological equipment.

The closest analogue is a method of molding products from epoxy resin, including pre-treatment of the binder, molding, curing and machining of the workpiece (RF patent No. 2257297, B29C 41/04, BI No. 21 dated 07/27/2005).

However, the known method does not allow to obtain high physico-mechanical properties of the products (tensile strength, hardness, static bending strength, impact strength).

The technical problem to which the invention is directed is to increase the physicomechanical properties of the products.

This problem is solved in that in a method comprising pre-processing a binder, molding, curing and machining a workpiece according to the invention, pre-treatment of a binder is carried out in the liquid phase by nanosecond electromagnetic pulses and electromagnetic stirring. In addition, nanosecond electromagnetic pulses of 1 ns duration, an amplitude of 8 to 12 kV are used, the power in a single pulse is from 1 to 2 MW, the pulse repetition rate is 1000 Hz, the processing time is from 25 to 35 minutes.

In this case, treatment with nanosecond electromagnetic pulses contributes to the formation of additional interatomic chemical bonds, on the other hand, treatment with electromagnetic stirring (the pulse duration of which exceeds the duration of nanopulses) promotes the crosslinking of polymer macromolecules (binder). Thus, due to such combined processing of the binder, a change in the structure of the polymer occurs, an increase in the strength of interatomic and intermolecular bonds, and, consequently, an increase in the physicomechanical properties of the finished product. The proposed processing modes are optimal for a binder - epoxy resin.

The invention is illustrated by the drawing, which shows the installation diagram for the combined action of nanosecond electromagnetic pulses and electromagnetic stirring of a polymer binder.

An example implementation of the method.

To implement the method, an electromagnetic stirring control apparatus 1, an inductor 2, power supply inductors 3, a generator 4, a power supply of radiation electrodes 5 by nanosecond electromagnetic pulses, a polymer binder (Etal T 210) 6, a dielectric capacitance 7, dielectric supports 8 and electrodes 9 are used radiation of nanosecond electromagnetic pulses.

Installation works as follows.

The polymer binder 6 pre-mixed with the hardener is loaded in liquid form into a dielectric container 7, in which the electrodes 9 are placed. Then, the power supply inductors 2, 3 of the electrodes 9 are turned on and the polymer binder 6 is processed for 25 to 35 minutes. In this case, nanosecond electromagnetic pulses with a duration of 1 ns, an amplitude of 8 to 12 kV, a power in a single pulse of 1 to 2 MW, and a pulse repetition rate of 1000 Hz are used.

In this case, treatment with nanosecond electromagnetic pulses promotes the formation of additional interatomic chemical bonds, on the other hand, treatment with electromagnetic stirring (the pulse duration of which exceeds the duration of nanopulses) promotes the crosslinking of polymer macromolecules (binder). Thus, due to such combined processing of the binder, a change in the structure of the polymer occurs, an increase in the strength of interatomic and intermolecular bonds, and, consequently, an increase in the physicomechanical properties of the finished product. Monitoring the state of the polymer binder 6 is carried out by taking control samples in a known manner. After processing, the binder was used (for example) for vacuum compression impregnation with heat treatment of billets when forming impellers on a fiberglass basis for machines such as a centrifugal air blower.

Unlike analogues, the proposed method provides an increase in strength, stiffness, modulus of elasticity and the melting temperature of products based on epoxy resin during operation by improving the quality of the composition.

Claims (2)

1. A method of molding articles made of epoxy resin, comprising pre-processing a binder, molding, curing and machining a workpiece, characterized in that the pre-treatment of the binder is carried out in the liquid phase by nanosecond electromagnetic pulses and electromagnetic stirring. 2. The method of forming articles of epoxy resin according to claim 1, characterized in that nanosecond electromagnetic pulses of 1 ns duration, an amplitude of 8 to 12 kV are used, the power in a single pulse is from 1 to 2 MW, the pulse repetition rate is 1000 Hz, the processing time from 25 to 35 minutes

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