SU1027176A1 - Method for making products from polyphenylene oxides - Google Patents

Description

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This invention relates to the processing of polyphenylene ether (polyphenylene oxide) -polymer-based polymers into articles and can be used in the chemical industry.

A known method of manufacturing products from polymers, including non-meltable types of polyphenylene oxide, is a sintering method consisting in pressing at room temperature a billet of polymer powder (briquetting) followed by heat treatment without pressure (sintering. Briquetting pressure is 100-200 NPa, sintering temperature is 473–723 K, depending on the type of polymer being processed, sintering time is from several tens of minutes to several hours depending on the thickness of the product (0.5–3 h) 1.

The main disadvantage of this me; This is the impossibility of maintaining the geometric dimensions of the product during heat treatment without pressure due to the relaxation of elastic deformations in the material, as well as molding, including long-term heat treatment at elevated temperatures, which causes partial destruction of the material.

The closest to the proposed invention to the technical essence is a method for manufacturing polyphenylene oxide products, including heat treatment under pressure.

According to this method, powdered or granular material is molded in a mold under a pressure of 304o MPa at 563-573 K. The exposure time is 3 min / mm thickness.

The disadvantages of this method; the need to carry out the formation of prc maximum allowable temperatures up to temperatures leading to thermal oxide can be attributed. polymer destruction and, consequently, a decrease in the physicomechanical properties of the material.

The danger of thermal decomposition, which increases during prolonged heating, makes it impossible to obtain thick-walled products. The danger of thermal decomposition is increased for high-molecular-weight polyphenylene oxides.

The aim of the invention is to reduce the temperature and duration

 processing, as well as improving the physico-mechanical properties of products.

This goal is achieved by the fact that according to the method of manufacture of polyphenylene oxide products, which includes heat treatment under pressure, the dispersed particles of polyphenylene oxide are treated with a benzyl peroxide solution with a concentration of

(g / l, dried from solvent, compact the workpiece at 4h8448 K and pressure of 0-50 MPa min, and then heat-treating the product at and pressure of 22-2 MPa

5 15-18 min.

As PPO, a polymer produced by domestic industry, Arilox-IOOfty 6-05- 18-76) with a molecular weight of 30,000 was used.

0 in powdered and granular form. Low solvents RITELS, such as acetone, methyl ethyl ketone, etc., in which benzoyl peroxide is dissolved, were used as solvents.

As can be seen Vi3 of the examples given, the proposed method allows to increase the ultimate compressive strength and impact strength of the material by 30-35%

This method allows to reduce the molding temperature by at least 90-100 K and at the same time significantly (no less than twice) shorten the molding cycle.

The table shows the molding modes and the physicomechanical characteristics of products from PPO obtained from the known and proposed methods.

Claims (1)

METHOD FOR PRODUCING PRODUCTS FROM POLYPHENE ILENOXIDES. including heat treatment under pressure, characterized in that, in order to reduce the temperature and duration of processing, as well as improve the physicomechanical properties of products, dispersed polyphenylene oxide particles are treated with a solution of benzoyl peroxide with a concentration 4-16 g / l, dried from the solvent, compacted the product blank at 438448’k and a pressure of 40-50 MPa for 5-6 minutes and then heat treated the product at 473 ”483 * K and a pressure of 22-24 MPa for 15-18 minutes. p e £ IO27176