SU1110785A1 - Method for controlling coagulation of latex of divinyl-styrene rubber - Google Patents

Abstract

A METHOD FOR REGULATING THE COAGULATION PROCESS OF LATEX DIVINIP-STYREN RUBBER when mixed in a latex reactor with sodium chloride solution and return serum acidified with sulfuric acid, which consists in adjusting the pH of the reaction mass of sulfur acid to the sulfur content of the sulfuric acid, the acid content of the sulfuric acid, sulfuric acid, which involves adjusting the pH of the reaction mass in the reactor with sulfur acid and sulfur acid. the fact that, in order to increase the stability of the moisture content in rubber, the pH value of the reaction mass in the coagulation reactor is corrected in direct proportion to the bones of the polymerizate supplied to the inlet of the coagulation reactor.

Description

This invention relates to the automation of latex coagulation processes and can be used in the production of synthetic rubber.

A known method for automatically controlling the coagulation process of synthetic rubber latex, carried out by mixing the latex coagulation apparatus with sulfuric acid, interrupts the temperature variation in the coagulation apparatus, depending on the pH value of the reaction medium in the SI coagulation apparatus.

The disadvantage of this method is the instability of quality

rubber

The closest to the proposed technical essence is the method of controlling the coagulation process and the latex of the divinyl styrene rubber, carried out by mixing the latex in the reactor with sodium chloride solution and returnable serum acidified sulfuric acid, which consists in adjusting the pH of the reaction mass in the reactor impact on the consumption of sulfuric acid, acidifying serum C21.

However, this method does not provide

stabilization of the moisture content in rubber, since it does not take into account the change in the viscosity of the polymerizate (latex) supplied to the inlet of the coagulation reactor. At low viscosities of the polymerizate in the coagulation reactor, the formation of fine particles predominates, which give a very dense ribbon that does not have sufficient porosity. This greatly complicates the drying operation of the belt

processing of rubber, as a result, the quality indicators of rubber deteriorate, in particular, the moisture content of rubber.

With high viscosity values

Pskhpimeri Ata in the coagulation apparatus of the baby is so large that there is sticking of individual particles into large conglomerates. As a result, the operation of tape drying and rubber processing is also difficult.

The purpose of the invention is to increase the stability of the moisture content in rubber.

The goal is achieved according to the method of controlling the coagulation process of the latex of divinyl styrene rubber, carried out by mixing the latex in the reactor with sodium chloride solution and returning serum acidified with sulfuric acid, comprising regulating the pH value of the reaction mass in the reactor with an effect on consumption sulfuric acid, an acidic serum, the pH value of the reaction mass in the coagulation reactor is adjusted in direct proportion to the viscosity of the polymerizate supplied to the inlet d coagulation reactor.

The drawing shows a block diagram of the system for regulating the coagulation process of synthetic rubber latex.

The control system includes coagulation reactor 1, polymerizate (latex) 2 pipelines, sodium chloride 3, return serum 4, serum 5 discharged into wastewater, and sulfuric acid 6, a network of lento shredder 7, an analysis tool for measuring the pH value of 8 of the reaction mass at coagulation; the pH adjuster of the reaction mass 9, the regulator on the sulfuric acid pipe 10, an analyzer for measuring the viscosity of the polymerizate. 1 and comparison element 12.

The method is carried out as follows.

Coagulation reactor I is fed via line 2 with polyvinyl di-styrene rubber, and line 8 is a solution of sodium chloride.

The reaction mass from reactor 1 is fed to the net of the ribbon casting machine 7. The serum leaking through the web of the ribbon casting machine is returned via line 4 to reactor 1, and its excess is removed from line 5 by means of line 5. Return serum is acidified with sulfuric acid via pipeline 6.

The pH value of the reaction medium is measured using analyzer 8 and the signal proportional to it enters the pH regulator of the reaction mass 9, and the signal from the regulator 9 comes from a reference element 12, which prompts the deviation of the current viscosity value of the polymerizate measured by analyzer I and assignment.

3I

Regulator tor 9 handles dependency:

GHZSO I-BH,

where is the consumption of sulfuric acid, entering the reactor through the pipeline 6;

Bq is the viscosity of the surfactant measured using analyzer 11;

K - coefficient determined experimentally.

107854

Further, regulator 9, acting on regulator 10, changes the consumption of sulfuric acid.

This makes it possible to maintain the size of 5 polymer particles formed during coagulation at a given value and, thus caNbiM, helps to reduce the moisture content of the rubber.

When using this shadow invented image, the moisture content in rubber will be reduced by 14-17% compared to the base object.

Claims (1)

PROCESS REGULATION METHOD SA LEGEX COAGULATION OF DIVINIP-STYRENE RUBBER, carried out by mixing in a reactor latex with sodium chloride solution and return serum acidified with sulfuric acid, which involves adjusting the pH of the reaction mass in the reactor by affecting the flow of sulfuric acid, acidifying serum, characterized in that the purpose of increasing the stability of the content. moisture in rubber, the pH of the reaction mass in the coagulation reactor is adjusted in direct proportion to the viscosity of the polymerizate supplied to the input of the coagulation reactor. I 110785