The method of separation of butadiene- (-methyl)-styrene rubber, filled with mineral oil

 

(57) Abstract:

Usage: the invention relates to the production of oil-filled styrene-( a-methyl)-styrene rubbers obtained by the emulsion copolymerization, in particular to methods of selection of latex and can be used in the petrochemical industry. The challenge which seeks the invention is the stabilization of the coagulation process and the improvement of the properties of the obtained oil-filled styrene-( a-methyl)-styrene rubbers. Summary of the invention in the method of separation of butadiene-( a-methyl)-styrene rubber, mineral oil, comprising a mixture of oil with latex, coagulation oil-filled latex aqueous solutions of coagulants and mineral acid, the allocation of crumb rubber and recycling serum before applying the mixture of latex with oil on coagulation it is dispersed in three mixers, two of which centrifugal vertical and horizontal angle 90oto each other. Additionally latex-oil mixture is dispersed in hydrodynamic third mixer, where the streams enter towards each other with a speed of 18 - 25 m/s 1 Il., table 2.

The invention relates to the Oia, in particular, to methods of their separation from latex, and can be used in the petrochemical industry.

There is a method of allocating the best choice or butadiene-methylstyrene rubber from latex using as a coagulating agent substances protein origin [1]

The main disadvantages of protein coagulant when it is used to separate oil-filled latex of butadiene-( -methyl)- styrene rubbers is that in this case there is achieved a uniform distribution of oil in the rubber. This ultimately has a negative impact on the properties of rubber in the process of storage and processing, as with mineral oil in the rubber is injected and antioxidant.

Closest to the present invention is a method of separation of butadiene-( -methyl)-styrene rubber, consisting in a preliminary mixing of the latex with the mineral oil in the mixer, coagulation of the latex with an aqueous solution of coagulant and mineral acids, including recycling of serum, the concentration of crumb rubber, washing it with water, followed by extraction and drying [2] the Use of this technology input and dispersion of oil in the latex though about the performance communications sample in which indicates the presence of a small amount of white patches and patches with uneven color (from dark brown to light brown). This indicates uneven distribution of oil in the rubber.

The aim of the invention is the stabilization of the coagulation process and the improvement of the properties of the obtained oil-filled styrene-( -methyl)- styrene rubbers.

This is achieved in that the method comprises mixing the oil with latex, coagulation oil-filled latex aqueous solutions of coagulants and mineral acid, the allocation of crumb rubber and recycling serum before applying the mixture of latex with oil on coagulation mixing latex with oil is carried out in three mixers, two of which centrifugal vertical and horizontal angle 90aboutWith each other and additionally dispersed in the third hydrodynamic mixer, where the streams are introduced towards each other with a speed of 18-25 m/s

The use of additional mixer before applying latex-oil mixture on coagulation provides a high degree of dispersion of oil in latex and high uniform distribution. This is achieved through the nozzles toward each other. The feed rate of the mixture of latex with oil in each nozzle is 18-25 m/s the Speed of the oncoming blow flow is 36-50 m/C. This creates a high turbulence flow and intensive mixing. In these conditions, a homogeneous system with a uniform distribution of oil in the latex. Important in the invention is that when using it in the real process is not required to make substantial changes in the real effective production scheme.

The drawing shows a process diagram of the proposed process.

P R I m m e R. Latex on line 1 serves in a cascade of mixers 2 and 3 (one is vertical and the other horizontal) and mixed with mineral oil, supplied through line 4. From the last mixer 3 obtained latex-oil mixture is fed through line 5 to the mixer 6. In the mixer 6 is more intensive mixing of the latex with oil due to the supply of latex-oil mixture through the two nozzle towards each other with a speed of 18-25 m/s the Speed of an oncoming strike when it reaches 36-50 m/C. This creates a high turbulence flow, which allows for the fine dispersion of the oil in the latex. The obtained latex-turn 8. Then the mixture is sent to coagulation in the device 9, which is mixed with acidified with sulfuric acid serum. An aqueous solution of sulfuric acid in serum is introduced through line 10, and acidified serum in the apparatus 9 through line 11. the pH in the apparatus 9 is 6 to 0.5. From this machine the mixture in line 12 is sent to gotravel 13, where it is acidified with 4% sulfuric acid to pH 4 with 0.5. Received crumb rubber from the apparatus 13 is shown by line 15 for further processing.

The consumption of sulfuric acid on the secretion of rubber filled with oil, latex, 12-16 kg/ton of rubber, the ratio of latex:serum 1:(2-3). The coagulation temperature of 55-60aboutC.

The impact speed of latex and oil-threads on the properties of the obtained oil-filled best choice of rubber are given in table.1. Mark produced oil-filled rubber SKS-ARKM-15.

Thus, in table.1 data shows that the use of an additional mixer to obtain a more homogeneous mixture can reduce this disadvantage, as the variation in viscosity within the party (reduced to 1.7), to improve the resistance to thermal aging due to more uniform distribution of the antioxidant in the styrene rubbers.

In table.2 shows the results of tests and properties of butadiene-methylstyrene rubber isolated from the latex of the proposed method in comparison with the well-known (prototype).

Thus, on the basis of the obtained results we can conclude that the use of additional mixer has a positive effect both on the allocation process oil-filled rubbers and their properties. This process allows you to get maslonapolnennye rubber and with a high content of mineral oil SCS-30 apkm-27 and SKMS-30 apkm-27.

As the coagulating agent when selecting the best choice of oil-filled rubber is used 24% aqueous solution of sodium chloride 220 kg/ton of rubber, for the allocation of oil butadiene-methylstyrene rubbers used polymeric Quaternary ammonium salt of poly-N,N-dimethyl-N,N - diallylammonium flow rate of 2.0 kg/ton of rubber.

The METHOD of separation of BUTADIENE- ( -METHYL)-STYRENE RUBBER, MINERAL OIL, comprising a mixture of rubber latex with oil in the mixer, the coagulation of the oil-filled latex aqueous solutions of coagulants and mineral acid, the allocation of crumb rubber and the x mixers, two of which centrifugal vertical and horizontal angle 90oto each other, and in addition to the hydrodynamic mixer, where the streams enter towards each other with a speed of 18 to 25 m/s

 

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9 ex, 6 tbl

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2 tbl, 22 ex

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2 tbl, 11 ex

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EFFECT: reduced loss of rubber and environmental pollution at higher physicochemical characteristics of vulcanizates.

2 tbl, 11 ex

FIELD: rubber industry.

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2 tbl, 11 ex

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EFFECT: reduced loss of rubber and environmental pollution at higher physicochemical characteristics of vulcanizates.

2 tbl, 11 ex

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2 tbl, 11 ex

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13 cl, 1 tbl, 10 ex

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5 cl, 5 tbl, 14 ex

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5 cl, 2 tbl, 1 dwg, 14 ex

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10 cl, 6 ex

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4 tbl, 12 ex

FIELD: chemistry.

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2 dwg, 6 ex

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3 tbl, 7 ex

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