SU717067A1 - Composition for producing aqueous butylrubber dispersion - Google Patents

Description

(54) COMPOSITION FOR OBTAINING THE BUTTERKEY PREVENTION

The invention relates to the production of aqueous dispersions of butyl rubber (BC), which can be used in the industrial rubber goods industry for the production of films, coatings by the method of ion deposition, as well as in cТ1 ШТЕН1Ьной and fur industry as components of Compounds sealants, adhesives.

Compositions for the preparation of aqueous dispersions of non-emulsion polymers are known, which consist of KYUAc, solvent, polar additives (alcohols, ketones), emulsifier and water 1.

The use of a polar additive in the composition of the composition results in th: a sharp decrease in the size of the part of the degassed dispersions, which is unpleasant. their concentration by centrifugation.

The composition containing BC, hydrocarbon solvent (eliphatic or cyclic), ethyl alcohol 2 was selected as a prototype. Particles of dispersions obtained from this composition have a small size and a narrow distribution of Pb Rymers, which does not allow

Concentrated by their "trifugation target method with high efficiency."

A reduction in ethyl alcohol dosage (below the optimum, amounting to 67 (in the case of butyl rubber with a molecular weight of 35,000-45,000) or 110 (in the case of butyl rubber with a molecular weight above 50,000) mph.

100 pounds of rubber allows to slightly increase the size of the particles of the dispersions, however, there is a sharp increase in the foaming of emulsions and polymer losses during their degassing,

increases the time of dissolution of the polymer and the homogenization of emulsions (Table 1).

Yove to increase the particle size of the dispersions mechanically by reducing the intensity of Smwecey solutions of BA and emulsifier is not possible due to complete coagulation of the polymer, while distilling the solvent from the emulsions.

The purpose of the present invention is to increase the size of the rubber globules of the dispersion while maintaining its aggregative stability. In accordance with the goal

COMPOSITIONS for the production of water dispersion VK / including butyl rubber hydrocarbon solvent, ethyl alcohol, aode, In KaiecTBe emulsion, a contains a mixture of potassium oleate and alkyl sulfonate (AC) or alkyl. Sodium benzenesulphonate (ABS) or calcium in a jt ratio from 2: 1 to 14: 1, with the following 1-5 5 от но 1 1 1 мп мп мае, May. H: V 100 Solvent 300-600 Emulsifier Ethyl eb-12G-spyr; . 150-400. : Water Salt AC and ABS are used; in an amount of 0.3 - 2, O mi / s. h on May 100 h, VK. Soderzhayye-kol. Her AU or LAN in an amount less than 0, 3 ma.h ... does not give the desired effect; the use of THEM in the dose-. ro.v to ah, exceeding 2.0 May. hours at 100 May. HV, does not lead to a further increase in the size of particles of the degassed dispersions. Aqueous dispersion BK on the basis of the above composition is carried out as follows. In a yay; ra t, equipped with a stirrer and a shirt for, is isolated. they are loaded ;; - water, emulsifier, polymer (cut polymer, ethyl alcohol hydrocarbon rat. tel. l. Rast; polymer vorodёyuyushcheyut when mixing the contents: autoclave at a temperature of 12-18 h. to form a coarse emulsions with a calculated dry content substances.....: - ..:.; .., ...,. ..::: The resulting coarse emulsion; sym toMO: is generated by means of a centrifugal pump along a closed loop apparatus-on a c6c apparatus in for 8-20 hours at a temperature of 40-50 ° C with the formation of a thin emulsion. The solvent is distilled off at 40-65 With a vacuum of 300-500 rm. VC dispersions — after the solvent has been stripped off, are concentrated by centrifugation or evaporation. AC and ABS salts provide the most highly dispersed; emulsions having up to 70%, particles with size 1 micron. (potassium oleate gives only 45% of particles of this size.) For this, the salts do not provide high aggregative stability: 1st emulsion of emulsions during degassing (no lilo ymer in the form of coagulum; Reached in; in this case, about 40%, then as with potassium oleate use, only 8 - 12%). Using salt AC and BC mixed with potassium oleate as an emulsifier in the composition leads to a new unexpected effect - a significant increase in size. : - ..;. :.: -: ... pa emulsion particles and, accordingly, dispersions while maintaining their high aggregative stability during the process of degassing. Incorporation of equimolecular amounts of potassium oleate or other emulsifiers into the composition instead of the euley of AS or ABS does not cause a change in the particle size of VC dispersions, and in some cases even reduces it somewhat. The use of a mixed emulsifier Golium potassium, salt AC or ABC in the composition at a given ratio of components allows to obtain stable dispersions of VC with a particle size of .0.35-0.45 μm (using the quality of an emulsifier of one potassium oleate leads to the formation of dispcHifl with a particle ratio of 0.18 .0.23 μm). Centrifuging VC dispersions prepared according to the inventive composition allows to obtain 55-60% -Hbie concentrates at. . efficiencies of the process (relation to the amount of the polymer in the concentrate to the amount of the polymer in the initial dispersion) 85-90% May. When centrifuging the same dispersions made according to the prototype, 40-45% of non-concentrates are obtained with a process efficiency of 30-45% wt.h. Example. In an autoclave with a capacity of 20 liters, equipped with a propeller stirrer, Eko rotation of ZOO rpm and a jacket for heating, load with stirring 600 g of water, 4 g of Na-salt ABC, 12 g of potassium oleate, 240 g of ethyl alcohol, 400 g of butyl rubber crumb BK-16 brand 45 t 1200 g of cyclohexane, which corresponds to the polymer composition of the following composition, ma.h: Polymer100 Cyclohexane300 Ethyl alcohol60 Potassium oleate 3.0 Na salt ABC1.0 Water 150 Polymer stretching is carried out by mixing the contents of the auto clan at 60 ° C for 20 h, emulsification of the solution, the polymer in water with a centrifugal pump at 40 ° C for 2 h, - distilling the solvent from the emulsion at 40-60 ° C and a vacuum of 300-600 mm Hg. em. The obtained Diaperium is concentrated by centrifuging at 50 ° C using a separator separator. . For comparison, under the same conditions, a BK dispersion is obtained using a potassium oleate emulsifier as one. The data are given in table. 2. Example 2. 800 g of water, potassium oleate, 4 g of K-salt ABS, 200 g of butyl rubber crumb are loaded with stirring into an autoclave of Example 1

BK-1675 T, 240 g of ethanol / 1200 g of cyclohexane, which corresponds to the polymer composition of the following composition, May. h .;

Polymer100

Cyclohexane 600

Ethyl

alcohol120

Oleate potassium 4

 ABC2.

Water400

The dispersion is obtained in Example 1. For comparison, under the same conditions, a VC dispersion is obtained using potassium oleate as an emulsifier.

The obtained data is given in Table 2. Example 3, In the autoclave of Example 1, 600 g of water, 7 g of potassium oleate, 2 g of sodium alkyl sulfonate, 200 g of cpc butyl rubber BK-0865, 200 g of ethyl alcohol, 1000 g heptane, that with 6 responds: it is the polymer composition of the following composition, May. h; Polymer100

Heptane500

Ethyl

. alcohol100

Potassium oleate 3.5 Ma - salt AC 1 h Water 300

The dissolution of the polymer is carried out with stirring of the contents of the autoclave for 18 hours at. The coarse emulsions are homogenized with a centrifugal pump for 14 hours. Distillation of the solvent from the emulsion is carried out directly from the autoclave with the stirrer running at 50-65 ° C and vacuum 400- 650 mmHg Art. The resulting dispersion is centrifuged with

Effect of ethanol on the preparation and properties of butyl rubber dispersions

using a plate separator at 30 ° C.

For comparison, under the same conditions, a BC dispersion is obtained using potassium oleate as a solvent.

The obtained data is received in gabl.2.

Example4. In an autoclave at epy 1, 340 g of water, 8.4 g of potassium oleate are charged with stirring,

o in 0.6 g of sodium alkylsulfonate, 140 g of ethanol, 700 g of hexane, 200 g of butyl rubber crumb brand BK-2045T, which corresponds to the polymer composition of the following composition, 5 May. including:

one

Polymer100

Hexane 350

Ethyl @ alcohol70

Oleate potassium 4.2

Na-eol AC 0.3

Water / 170

A dispersion was prepared as described in Example 3. 5 For comparison, under the same conditions, a VC dispersion is obtained using potassium oleate as an emulsifier.

The data are given in

0 tab. 2..,

The use of a mixture of potassium oleate and alkyl sulfonate or sodium or potassium alkyl benzene sulfonate as an emulsifier in a mass ratio of 2: 1 to 14: 1 allows you to increase the dispersion stability (the polymer loss during the distillation of the solvent decreases to 5.2-7% by%) ,; and also to increase the size of particles (globules) of degassed dispersions,

This facilitates their concentration by centrifuging.

Table

one

.-l hchll

Table 2

Claims (1)

Claim Composition for the production of water .45 butyl rubber dispersion, including butyl rubber, hydrocarbon solvent, ethyl alcohol, emulsifier and water, characterized in that, in order to increase 50 May including: Butyl rubber 100 Solvent 300-600 Emulsifier 4-6 Ethyl alcohol 60-120 Water 150-400 the size of the globules of rubber dispersion while maintaining its high aggregative stability, as an emulsifier, the composition "cSdrЖt 'mixture" ...... potassium oleate and alkylsulfonate or 55 alkylIbenzenesulfonate sodium or potassium 4 in the ratio of 2: 1-14: 1, with Compiled by