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Nauchno-proizvodstvennoe Obiedinenie 'norplast'

Valentin P Krasnokutsky

Nikolai S Enikolopov

Semen F Sholk

Mikhail G Brusilovsky

Anatoly I Nepomnyaschy

Viktor A Pekarsky

Valentin F Kostylev

Evgeny N Novozhilov

Leonid I Kurakin

Pavel P Sherstnev

Elena L Akopian

Lev A Fedotov

Saibdzhan S Negmatov

Jury M Brodsky

Svetlana A Platonova

Lidia A Filmakova

Khristofor A Markarian

Boris B Kudryavtsev

Yury A Polivanov

Nikolai N Begunov

Vilitary B Pavlov

Suleiman K Matkarimov

Ivan V Zhigarev

Galina I Nemtinova

Jury R Svidler

Alexandr S Tumansky

Vadim A Knyazev

There is provided a method wherein the source material, rubber or vulcanization products is pulverized in an extruder wherein it is first compressed by a force of 0.2 to 0.7 MPa, then subjected simultaneously to a pressure ranging from 0.2 to 50 MPa and a shear force ranging from 0.03 to 5 N/mm.sup.2 while heating the material to a temperature ranging from 80.degree. to 250.degree. C. and then cooling said material to a temperature ranging from 15.degree. to 60.degree. C. The source materials can be used rubber goods, such as used tires and rejects of tire industry, footwear and industrial rubber production.

Method of making powder from rubber and vulcanization products

According to the invention, a cartridge filter for cleaning liquids and gases from mechanical impurities comprises compartments containing filtering cartridges, a pressure difference indicator and a control unit. The compartments are provided with cover plates having pipes for filtering and cleaning the compartments containing the cartridges, perforated guides and a spring device for locking the cartridges. The filter is also provided with mechanisms for moving the compartments and cover plates and a device for storing and replacing the filtering cartridges. The filter according to the invention enables an improved productivity owing to the elimination of manual operations of disassembly, replacement of cartridges and assembly of the filter, compliance with sanitary requirements and reduction of losses of filtered product.

Cartridge filter

A method for preparing biuret-structure polyisocyanates which comprises reacting 1,6-hexamethylenediisocyanate with water which is introduced into the reaction zone in the form of vapors in a mixture with air or an inert gas at a moisture content of said mixture of from 0.1 to 2.0 kg/kg and temperature of from 110.degree. to 130.degree. C. The reaction is carried out at a temperature ranging from 150.degree. to 170.degree. C. The polyisocyanates having biuret structure as produced by the method according to the present invention have a molecular mass of about 800, the content of isocyanate groups is as high as 23.59%. No polyurea is formed in the reaction. The process is single-staged, technologically simple and can be performed continuously.

Method for preparing biuret-structure polyisocyanates

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Zagorsk, undefined

Valentin P Krasnokutsky