The allocation method grafted copolymers abs

 

(57) Abstract:

The essence of the invention: invention allows to improve the environmental and technical-economic indicators of the process of obtaining plastic ABS through a full binding Polignano by degassing of Acrylonitrile, to reduce the consumption of coagulant and to improve the degree of alignment of the polymer with an antioxidant. The aim is achieved in that in the known method the selection of grafted copolymers ABS, obtained by the emulsion polymerization, including coagulation degassed latex aqueous solution of aluminum sulfate, the stabilization of the suspension of ionol and separation of the copolymer from the aqueous phase into the flow of degassed latex consistently dispense a 10 - 15% aqueous solution of sodium sulfite, maintaining the mass ratio of free Acrylonitrile : sodium sulfite is in the range from 1 : 2.5 to 1 : 3.0, and reacting 1,5 - 2,0 h, aqueous suspension of BHT in the amount of 0.36 to 0.39 wt. % copolymer and an aqueous solution of the coagulant is aluminum sulfate in the amount of 1.85 - 1,95 wt. % in the copolymer. 1 Il., table 1.

The invention relates to methods for producing impact-resistant resin plant plastics ABS, obtained by the method of emulsion graft polymer is.

There is a method of selection of the grafted copolymers of the type ABS, obtained by the emulsion polymerization by adding to the latex before coagulation of 0.5-10 wt.h. plasticizer in aqueous emulsion, followed by the coagulating solution of calcium chloride.

The disadvantages of this method are the need to use fairly scarce plasticizers (type propilenglikolstearat), the complexity of their administration in the form of an emulsion, the use of insufficient coagulant is calcium chloride, which does not ensure receipt of the particles of narrow fractional composition for further processing.

Closest to the proposed invention by the technical nature taken for the prototype and the basic method is the method of selection of grafted copolymers ABS, in which coagulation degassed latex obtained by emulsion polymerization using an aqueous solution of coagulant (aluminum salts) in the apparatus with a stirrer, followed by filtering and processing the selected product. This method is implemented in industry Uzlovskaya "Plastic".

As monomers for obtaining the original latex usually use butalital - Acrylonitrile and styrene ( -methylsterol). The overall conversion of monomers during polymerization is 96-98%.

The disadvantages of the method adopted for the prototype:

1) remaining in the latex after degassing steam Acrylonitrile in the amount of 0.07 to 0.1 wt.% partially enters besieged plastic and drying in air dryers vented to the atmosphere with exhaust air from the dryers, and partly discharged into the waste water. Acrylonitrile is a very toxic product hazard class II, which hit in the atmosphere and water, even in small quantities is extremely undesirable because of the damage to the natural environment;

2) use as a coagulant only aluminum salts can not withstand the pH of the coagulation process, to achieve a narrow distribution of polymer particles in size and are characterized by leakage of small particles in the waste water. If this is not achieved uniformity of distribution of the oxidant is introduced continuously into the flow of latex.

The aim of the invention is to increase the ecological and technical-economic indicators of the process of obtaining plastic ABS through a full binding is not removed by degassing of Acrylonitrile, reducing consumption of COAG, is that the known method of allocation grafted copolymers ABS, obtained by the emulsion polymerization, including coagulation degassed latex aqueous solution of aluminum sulfate, the stabilization of the suspension of ionol and separation of the copolymer from the aqueous phase into the flow of degassed latex consistently dispense a 10-15% aqueous solution of sodium sulfite, maintaining the mass ratio of free Acrylonitrile: sodium sulfite is in the range from 1:2.5 to 1:3.0, and reacting 1,5-2,0 h, aqueous suspension of BHT in the amount of 0.36 to 0.39 wt.% the copolymer and an aqueous solution of the coagulant is aluminum sulfate in the amount of 1.85-1,95 wt.% the copolymer.

The process is executed as shown in the drawing the schema as follows.

Degassed latex ABS with residual Acrylonitrile 0,07-0,1% from the evaporator 1 through line 2 by pump 3 serves in the capacity of 4. In line 2 by line 5 dispense a 10-15% aqueous solution of sodium sulfite, maintaining the mass ratio of free NAC: sodium sulfite is in the range from 1:2.5 to 1:3.0, and reacting 1,5-2 hours From the tank 4 latex on line 6 sent to bethey mixer 7 where on line 8 serves stabilizer - ionol, in the amount of 0.36 to 0.39 wt.% (copolymer) in suspension.

In the intermediate vessel 4 is the binding of residual Acrylonitrile and sodium sulfite. The reaction produces a product soluble in water and subjected to a complete biological oxidation.

In contrast to the known, the claimed method is complete binding of Acrylonitrile with the exception of its air emissions and sinks, and the subsequent processing of product consumption is reduced coagulant, decrease of the polymer with the wastewater by increasing the homogeneity of mixing, reducing the amount of stabilizer. The essence of the invention is illustrated by examples.

Examples 2-4 confirm in comparison with example 1 of the prototype that implementation of the proposed invention will:

1. Dramatically reduce or eliminate the emissions of harmful substances Acrylonitrile in the atmosphere, the amount of which is about 50 tons per year (in nominal production capacity of 20 thousand tons/year and the content of residual Acrylonitrile in the latex is not more than 0.1%).

2. To reduce the consumption of o the process of stabilization, that will ultimately lead to reduced consumption of scarce stabilizer (in terms of specified capacity of up to 6 t/year).

4. To reduce the loss of ABS plastic due to the leakage of small polymer particles in the waste water in terms of the specified capacity of 10 tons per year.

Basic properties of ABS plastic with implementation of the proposed invention does not change (impact strength, yield strength).

The ALLOCATION METHOD GRAFTED COPOLYMERS ABS, obtained by the emulsion polymerization, including coagulation degassed latex aqueous solution of aluminum sulfate, the stabilization of the suspension of ionol and separation of the copolymer from the aqueous phase, characterized in that the flow of degassed latex consistently dispense a 10 - 15% aqueous solution of sodium sulfite, maintaining the mass ratio of free Acrylonitrile and sodium sulfite of 1 : 2.5 to 1 : 3, and the time of interaction between 1.5 - 2 h, aqueous suspension of BHT in the amount of 0.36 to 0.39 wt.% the copolymer and an aqueous solution of the coagulant is aluminum sulfate in the amount of 1.85 - 1,95 wt.% the copolymer.

 

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7 cl, 1 tbl, 10 ex

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