SU975715A1 - Method for controlling coagulation of synthetic rubber latex - Google Patents

Description

(.54) METHOD FOR REGULATING THE COAGULATION PROCESS OF LATEX SYNTHETIC RUBBER

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

There is a known method {to coagulate the process of coagulating synthetic rubber latex by mixing L latex with electrolyte (sodium chloride solution) and recovered from the mill casting serum, which consists in changing the electrolyte consumption depending on the latex consumption and coitsentation of the latex, adjusting the amount of electrolyte consumption depending on the electrolyte consumption depending on the latex consumption depending on the latex consumption. polymer latex 11 3.

The disadvantage of this method is that it does not take into account changes in the concentration of electrolyte in the return serum, which leads to a change in the total emulsifier concentration in the coagulation apparatus, and this adversely affects the quality of the rubber produced.

The closest to the invention due to technical futility is the method of controlling the process-coagulation of synthetic rubber latex by mixing and latex with electrolyte and recovered from the molding mill

machines serum, which consists in changing the electrolyte consumption in the apparatus, depending on the concentration of electrolyte in the return serum 2.

The lack of a well-known method is that it does not take into account changes in the pH value of the reaction mass during coagulation, on which the homogeneity of the crumb composition depends.

10 rubber. If the pH value of the reaction mass during coagulation is small, then a large crumb is obtained, which is prone to sticking together, if it is high, further production may be disturbed.

15 process, i.e. The process of drying the rubber tape is hampered due to the small particle size, besides fine particles, the passage through the net of the molding machine can be lost.

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The purpose of the invention is to increase the stability of the quality indicators of rubber and reduce its losses in the stock of the belt mill.

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Claims (2)

This goal is achieved in that according to the method of controlling the coagulation process of synthetic rubber latex, carried out by mixing in a coagulation apparatus 30 Tex with electrolyte and serum returned from a machine, in a change in the flow rate of electrolyte in the coagulation apparatus depending on the concentration of electrolyte in the return serum, the flow of electric power is additionally adjusted; it is directly proportional to the dependence on the pH value of the reaction mass during coagulation. The drawing shows a block with A system for controlling the coagulation process of synthetic rubber latex, which implements the proposed method. The control system includes a coagulation unit 1, latex duct 2, electrolyte duct 3, web of the molding machine 4, return serum tubing 5, duct 6 serum ,; sensitive element 7 of electrolyte consumption, electrolyte consumption regulator 8, regulator 9 installed on pipes of electrolyte supply, analyzer 10 of electrolyte concentration in return serum, analyzer 11 for measuring the pH value of the reaction mass during coagulation, element 12 compare. The method is carried out as follows. The coagulation apparatus 1 is supplied with synthetic rubber latex through a pipe 2, and electrolyte (a solution of chloride) is supplied through pipe 3 water .... The reaction mass from apparatus 1 is fed to the net 4 of the molding machine. The serum leaking through the mesh of the ribbon casting machine through pipeline 5 is returned to the apparatus 1, and the election of pipe 6 is removed from production. The sensing element 7, the regulator 8 and the regulator 9 form a circuit for regulating the splitting of the electrolyte. The electrolyte concentration in the return serum is measured by the analyzer 10 and the signal proportional to it is fed to the reference chamber of the electrolyte flow controller 8. Control correction chamber 8 from the reference element enters a signal proportional to the deviation of the pH value from the specified nominal value, measured by the analyzer 11. As the output signal of the reference element 12 increases, the electrolyte consumption regulator, acting on the regulator 9, increases the flow rate of the electrolyte entering into the coagulation apparatus and vice versa. The use of the proposed method for regulating the coagulation process of synthetic rubber latex provides a homogeneous rubber composition, i.e. adjusts the size of polymer particles on the grid of the belt molding machine, which improves the stability of rubber quality indicators, for example, the Mooney polymer viscosity, and reduces by 15% the loss of rubber on the drain of the grid of the belt molding machine, which is discharged together with serum wastewater. Claims The method of controlling the process of coagulation of synthetic rubber latex, carried out by mixing in the apparatus of latex cation with electrolyte and returned serum slurry machine, concludes in changing the electrolyte consumption in the coagulation apparatus depending on the concentration of electrolyte in the refractory serum the fact that, in order to increase the stability of the quality indicators of rubber and reduce its losses on the stock of the webbing machine, it will additionally correct the consumption electrolyte in direct proportional dependence on the pH value of the reaction mass during coagulation. Sources of information taken into account in the examination 1. The author's certificate of the USSR 785319, cl. C 08 C 1/14, 1979. 2. Rabinerson MA and others. Development of coagulation conditions for latex. Rubber and rubber, 1961, No. 4, p. 1622 (prototype). I fZ