SU956490A1 - Method for controlling process of low-temperature emulsion polymerization of divinylstyrene rubber - Google Patents

Description

depending on the flow rate of the hydrocarbon charge, the emulsifier consumption is additionally adjusted inversely proportional to the ratio of monomer consumption rate to modifier consumption rate determined at the output of the first polymerizer.

The drawing shows a control system implementing this method. The scheme contains the head polymerization unit 1 of a polymerization battery, the emulsion supply pipelines 2, monomer 3 (due to the comparable reactivity of styrene and divinyl are considered as one monomer), modifier 4, initiator 5, emulsifier 6; pipeline 7 output of the reaction mass; sensitive elements of emulsion consumption 8, monomer 9 modifier .10, initiator 11, emulsifier 12; emulsifier 13 flow controller; regulatory body 14; analyzer 15 conversion of monomers; analyzer 16 concentration modifier and computing unit 17 ". The system works as follows

At the entrance of polymerization 1 pipeline 2 receives an emulsion consisting of monomers, a modifier, an initiator, an emulsifier and an aqueous phase (the aqueous phase is not shown in the diagram, it is not shown). The reaction mass through conduit 7 is withdrawn from the polymerization shop to the distillation compartment of the non-dimerized monomers.

Costs, emulsions, monomers, modifier, initiator and emulsifier are measured using sensitive elements 8-12.

The flow rate of the emulsifier is controlled by the regulator 13 and the regulator 14 installed on the supply line of the emulsifier.

The conversion of monomers is measured by analyzer 15, and the concentration of modifier by analyzer 16

The control system contains a computing unit 17, to the input of which the sensors are connected 8-12, 15 and 16, & HOD the computing unit 17 enters the flow controller of the emulsifier 13.

Initially, the computing unit 17 calculates the residence time of the reaction mass in the polymerizer 1:

V

t

No. (1)

G7 rm

- the volume of this polymerization V torus; - consumption r.eoperative mass

P w

Then, the consumption rate of the monomers W and W of the modifier W is determined.

W -. Count. And Gij.M

G.,. , - Oh / and ..

(2)

GM S At m; G at

W,

(3)

where C

hydrocarbon consumption shihch.

conversion of monomers at the output of polymerization unit 1;

GM modifier consumption;

c, the initial concentration of the refiner;

Gm

the concentration of the modifier at the output of the polymerizer 1.

Further, the computing unit finds the value of the ratio, compares the obtained values with the set values and, depending on the deviation obtained, as well as the measured value of the hydrocarbon charge, changes the setting to the emulsifier consumption controller 13 until the ratio; W / Wj is equal to the specified value. .

Below are data confirming the increase in tensile strength of rubber during the implementation of the proposed method.

Durability-. Chuka on a gap, kg / cm

230 - 250 245 - 250

The proposed method allows to increase the strength of rubber by 10 units, which leads to an increase in the service life of rubber products.

Claims (1)

Invention Formula The method of controlling the process of low-temperature emulsion polymerization of divinyl styrene rubber, which consists in the change and consumption of the emulator supplied to the input of the polymer battery, depending on the consumption of the hydrocarbon charge, which in order to increase the strength of the rubber, adjust the flow of the emulsifier in inverse proportion to the weight of the emulsion. consumption of monomer to the rate of consumption of the modifier, defined at the output of the first polymerizer. ™ c ™ 5956490 ka, g; -y „gge, ie3f“ -; :: .-; , ° j, / - v.r: "- 5; s, C 4U"