SU735609A1 - Method of producing aqueous carbon black dispersion for carbon black-filled rubbers - Google Patents

Description

one

The invention relates to the rubber industry, in particular, to the development of a method for producing an aqueous dispersion of carbon black for black rubber.

A known method for producing an aqueous dispersion of soot for black-filled rubbers by introducing (dispersing) soot into the diluted rubber latex P1. The known method takes a long time because of the duration of dispersion of soot. In addition, the resulting dispersion is not stable enough.

The purpose of the invention is to reduce the time to obtain a dispersion and increase its stability.

The goal is achieved by obtaining carbon black dispersion of carbon black by introducing carbon black into diluted rubber latex, carbon black and latex are introduced at a ratio of (latex to soot), respectively, 1: 100, followed by dispersion in water to obtain 3-8% Soot dispersion.

The proposed method is illustrated by the following examples.

Example. The laboratory mixer granulator, which is a hollow cylinder cylinder 420 mm long with an inner diameter of 120 mm and equipped with a rotor with a rotational speed of 380 rpm, on which fingers are arranged in a two-way helix with a pitch of 12 mm, is simultaneously fed with

10 carbon black (grade PM-120V) latex butadiene-methyl styrene rubber (SKMS-ZOARK) with a dry residue concentration of 0.5 wt.% In an amount of 2 weight. parts on 1 weight. h soot (first stage of the process of obtaining a water dispersion

ts soot). The obtained wet granules in the amount of 300 g are loaded into a ball mill and 1.7 liters of distilled water are poured in there (the second stage of the process of obtaining an aqueous soot dispersion). After 3,6,12 and 24 h processing

20 in a ball mill take soot dispersion samples. The obtained samples of the dispersion have a soot concentration of 5% and contain about 1 weight.h. polymer per 100 weight.h. soot.3 .7 Samples of a control water dispersion of soot (1Ш-120В), previously granulated in a mixer-granulator by mixing 1 -HbiM molasses solution (sugar production waste) in a weight ratio of 1: 1 followed by drying, are prepared in a known manner in a known manner. granules to a moisture content of not more than 0.5 wt.% for 100 g of dry soot granules are loaded into a ball mill, pour 1.9 l of latex butadiene methylstyrene rubber (SKMS-ZOARK) with a dry matter content of 0, ds weight. % After 3, 6, 12 and 24 hours of treatment, the results are obtained from a dispersion similar in composition to the experimental one. At the same time, 100 g of PM-120V dusty soot and 1.9 l of butadiene-methylstyrene rubber latex with a dry matter content of 0.05 wt.% Are loaded into an orange mill. After 48 hours of treatment, a clean latex is obtained from soot from the soot with floating soot on the surface of the dust. Thus, a control dispersion based on dusty soot is not obtained when it is prepared in a known manner. 20 ml of the prepared dispersions were cast into glass tubes and stored. After some time, the dispersions begin to exfoliate with the formation of a clear layer of water that does not contain soot in the upper part of the tube. The stability of the dispersion is judged by the time of its separation from the time of preparation. The results of the evaluation of the stability of the experimental and control dispersions, depending on the time of their preparation, are given in Table. one. . 1600 g of water dispersion of soot PM-120V, obtained after 12-hour treatment in a ball mill, poured into 1000 g; Butadiene-methylstyrene rubber latex SKMS-ZOARK with a solids concentration of 20 wt. The resulting mixture is coagulated in 2500 ml of a solution containing 10 ir sulfuric acid and 110 g of sodium chloride. The rubber strip is filtered out ot serum, washed and dried to a moisture content of not more than 0.5 wt.%. A rubber compound containing 1.5 parts by weight is prepared from the laboratory rubber on the laboratory rollers. stearic acid, 5 wt. including oxide of iron, 2 weight.h. altax and 2 weight parts sulfur on BUT weight.h. rubber At the same time, black rubber and rubber mixture are prepared using a soot control dispersion. From mixtures vulcanized samples at a temperature of 143 ° C for 80 minutes. The results of the yen of rubber mixtures and vulcanizates are given in table. 2. PRI mme R 2. Water dispersion of soot and carbon black filled rubber is prepared and tested in Example 1, but using; fiery furnace soot (mark PM-100). The results of the evaluation of the stability of the dispersion in comparison with the data for the control dispersion are shown in Table. 3. The results of testing rubber compounds and vulcanizates are given in Table. 2. EXAMPLE 3. An aqueous soot dispersion is prepared as in Example 2, but in the first stage of the preparation of a water soot dispersion, a SKN-40 butadiene-nitrile rubber latex with a dry residue concentration of 0.25% by weight is used. The results of testing rubber compounds and vulcanizates are given in table. 2. PRI mme R 4.. In a pipeline with a carbon black mixture, connecting the reactor to obtain carbon black PM-120B with a bag filter, the latex butadiene-styrene rubber SKS-65GP is fed through a nozzle with a dry residue concentration of 0.05 wt.% , obtained by emulsion copolymerization of butadiene and styrene in a weight ratio of 35:65, in an amount of 0.05 parts by weight on 1 weight. carbon black in the carbon black gas mixture (the first stage of the process of obtaining a water dispersion of carbon black). Sazhegazov mixture further goes on filtering into a bag filter FR-58. In a bag filter, the waste gases are separated from the coagulated soot and fed to the afterburner, and the filtered soot is fed through a sluice stopper to a sealant, which is a 0.8 m cylindrical apparatus with a cone-shaped agitator with a speed dial of 5.6 rpm From the compactor, using a screw conveyor, the dusty soot is fed for dispersion into an emulsion machine and dispersed in water-steam condensate for 30 minutes until dispersion with a soot concentration of 5% by weight is obtained (second stage of the process). Data on the effect of carbon black on the filtration process of the carbon black gas is given in Table. 4. Black-filled rubbers are obtained from the resulting aqueous dispersions of carbon black, which are tested in accordance with Example 1. The results of testing rubber compounds and vulcanizates are given in Table. 2. PRI mme R 5. A water dispersion of carbon black VM-DOM is prepared according to Example 4, but latex is introduced into the carbon black mixture in the first stage of the process in an amount of 0.1 weight parts. on 1 weight. soot. The results of the evaluation of the filtration process of the carbon black gas mixture and the testing of black rubber with the resulting dispersion are given in Table. 4 and 2. PRI me R 6. An aqueous dispersion of carbon black PM-120B was prepared in accordance with Example 4, but the latex was introduced into the carbon-black mixture at the first stage of the process in an amount of 0.25 parts by weight. on 1 weight. soot. The results of the evaluation of the filtration process of the carbon black gas mixture and isp.ch sozhiaiiolnits5735609

Tables of Kauluk with the obtained dispersion are given respectively in Table. 4 and 2.

From the above examples, it can be seen that the pre-molded two-stage method for obtaining a water dispersion of carbon black for black rubber when applying latex to the carbon black mixture significantly improves the coagulation of dust black and its separation from the exhaust gases, eliminating Granulation and carbon black drying during its production. When applying latex to a dusty drywall, the operation of its day is excluded. The proposed method of producing soot dis-Persia is characterized by a better quality of soot dispersion, as evidenced by more than 15, of the soot dispersions.

Dispersion on the proposed

Indicators way

Soot dispersion time in a ball mill, h36

The time of the beginning of dispersion 4 16 28 30

high stability of dispersions and improved quality of black filled rubbers obtained with their use. After 12 hours of dispersion (in a ball mill, the aqueous dispersions are superior in storage to the two-stage method, in storage stability; IHC by about 30–50% by the well-known one-stage method. In terms of resistance, the known rubbers will be 5–7% higher in terms of resistance, which makes it possible to significantly increase the service life of tires –1 of rubber products made on the basis of such rubbers.

Table I

Dispersion by the known method

3 6 12 24

1224

25 14 22

with

S,

c: you and n

S

N

00 hl i

about

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The results of the evaluation of the stability of the water dispersion of soot PM-100

ten

Table

IndicatorsExperienced, Water Control Water

Soot Dispersing

in ball melgnitz, h 36 12 243 6 12 24

The beginning of the bundle -

dispersion, h5 20 31323 7 22 27

 . -

The effect of SCS-BSH rubber latex on the coagulation process of a carbon black mixture at a flow rate of 20 m / s and pace. tour

Process parameters: latex content in aerosol per 1 weight.h.

Concentration of carbon black in the mixture, g / m 5050.5050

Median-average particle size before3-520-30 60-70 90-120

filter, µm Weight content in a mixture of particles

with a size less than 5 microns,% 54-6210-12

 .. "-,, ..., ........,., .- ..., ........, ....,.,,

Claims (1)

Claim the ratio of the dry residue of the corresponding method of obtaining an aqueous dispersion of carbon black cue in water to obtain a 3-8% dispersion for black-filled rubbers, the introduction of a sassage. M a in diluted rubber latex, about t and S-sources of information, due to the fact that, for the purpose of reduction, taken into account in the examination Neither the time to obtain a dispersion or higher-1. USSR Copyright Certificate № 447046, nor its stability, soot is introduced into the latex with cl. C 08 C 1/14, 1974 (prototype). dispersion dispersion soot (parts) O G 0.050,10 I 0,25 -, - I -. . -. but 100: 0.01-1 followed by dispersive