Mineral filler for rubber based on vinylsiloxane rubber, butadiene-nitrile synthetic rubber and butadiene-alpha-methylstyrene rubber

FIELD: chemistry.

SUBSTANCE: sludge formed during lime treatment and coagulation crude water on the water treatment installation of thermal power plants, having chemical composition CaCO3+ MgO + Mg(OH)2 +SiO2 +Fe(OH)3 +Al(OH)3 is used as mineral filler for rubber based on vinylsiloxane, butadiene-nitrile synthetic rubber and butadiene-α-methylstyrene rubber in amount of up to 50% of the weight of the rubber.

EFFECT: invention widens the range of rubber filler materials, lowers the cost of rubber, and solves the problem of recycling thermal power plant wastes.

3 dwg, 1 tbl

 

The invention relates to the chemical industry, in particular the production of a number of rubber compounds, having in its composition of mineral fillers.

Use as fillers rubber industrial sludge is a promising direction in the development of the chemistry of composite materials. In world practice, the most widely filling rubbers are used kaolin, carbonates, alumina (Principles of design of composite polymeric materials / Ali, Saualpe, Vgusman, Nsanimation. M.: Chemistry, 1990).

Know the use of mineral fillers of natural origin - chalk, kaolin for rubber based on butadiene, butadiene-styrene, siloxane rubbers (PHEV. The common technology of rubber / PHEV and other M.: Chemistry, 1978. S-260).

Reducing the cost of rubber is achieved by replacing the standard filler (Aerosil, kaolin) cheaper component. The value of the dried sludge generated during liming and coagulation of raw water treatment installation of thermal power stations is more than 1000 rubles, the cost of Aerosil, kaolin is more than 2000 rubles.

The problem to which the invention is directed, is the expansion of rubber fillers, cheaper rubbers on the basis of vinylsilanes the rubber, nitrile butadiene and butadiene-α-methylstyrene rubber while maintaining the physico-chemical properties of rubber, and the disposal of sludge.

The technical result is achieved by the fact that, as a mineral filler for rubbers based vinylsilanes rubber, butadiene-nitrile and butadiene-α-methylstyrene rubbers used sludge formed during liming and coagulation of raw water treatment installation of thermal power stations, in the amount of 50% by weight of rubber, formed by liming and coagulation of raw water treatment installation of thermal power stations.

The chemical composition of the sludge:

Caso3+MgO+Mg(OH)2+SiO2+Fe(OH)3+Al(Oh)3.

The sludge formed during liming and coagulation of raw water treatment installation of thermal power plants, was tested as a mineral filler for rubbers based vinylsilanes rubber produced by the plant SK them. S.M. Kirov, Kazan, and rubbers based on butadiene-nitrile synthetic rubber and butadiene-α-methylstyrene rubber manufactured by the company LLC "Quart" Kazan.

The composition of the mixture based on vinylsilanes rubber parts: rubber 100; Aerosil 40; peroxide Dicumyl 1; sludge 50.

The composition of the mixture based on boutade the n-nitrile synthetic rubber, parts by weight of: rubber 100; technical stearic acid 1; zinc white 3; sulfenamid 0,7; sludge 50; sulfur technical 1,5.

The composition of the mixture on the basis of butadiene-α-methylstyrene rubber parts: rubber 100; zinc white 5; dibenz-2,2-thiazoleacetate 2,75; sludge 50; sulfur technical 2.

Experimental studies have shown that the sludge formed during liming and coagulation of raw water treatment installation of thermal power stations, is easily introduced into the rubber in an amount up to 50 weight percent. In figure 1, 2 and 3 shows the graphical dependence on strength at break, relative elongation, shore hardness and relevant physico-chemical parameters of the control samples on the basis of vinylsilanes rubber.

With the introduction of the sludge into the rubber-based vinylsilanes rubber tensile strength, elongation slightly changed in comparison with the control samples, the shore hardness increases.

The table presents the physico-chemical characteristics of rubbers based on butadiene-nitrile synthetic rubber and butadiene-α-methylstyrene rubber filled with sludge, and the relevant physico-chemical characteristics of the control samples of these rubbers filled with kaolin.

The test results of rubber filled with mud and kaolin
№ p/pIndicesButadiene-nitrile synthetic rubberButadiene-α-methylstyrene rubber
control sample with kaolinthe sample slurrycontrol sample with kaolinthe sample slurry
50-50-
-50-50
1Conditional tensile strength, kg/cm280,037,033,014,0
2Elongation, %910860 720680
3Residual elongation, %56483624
4Shore a hardness, cu53465247
5Ball rebound resilience, %26273940
6Tear resistance, kgf/cm24183834
7The change in strength after incubation at 100°C for 24 hours, %-32,5-31,9-24,4-21,6
8The change in the relative elongation after incubation at 100°C for 24 hours, %-42,8-48,6 -22,2-25,4
9The plasticity Carrera, cu0,320,360,520,54
10Low temperature brittleness, °C-60-60-56-58
11The coefficient frost resistance under compression at a temperature of -30°C0,360,320,540,50

With the introduction of the sludge in rubber based on butadiene-nitrile synthetic rubber and butadiene-α-methylstyrene rubber tensile strength is reduced to 1.5-2 times, plasticity, thermal aging embrittlement temperature, the coefficient frost resistance, elongation, residual elongation, elasticity and hardness change within experimental error (rubber. Testing methods. The compilation. M: the Committee of standards, measures and measuring instruments, 1968).

Thus, experimental studies have shown that the sludge is introduced into the rubber-based vinylsilanes rubber, butadiene-neither rolnego synthetic rubber and butadiene-α-methylstyrene rubber to 50% by weight of rubber. Also the introduction of sludge formed during liming and coagulation of raw water treatment installation of thermal power stations, allows not only to obtain rubber physico-chemical properties, but also to reduce the cost of tires.

Retrieved filled with slurry rubber-based vinylsilanes rubber can be used as a cushioning and sealing materials at a temperature of from -60°C to 180°C.

In the field of energy sludge formed during liming and coagulation of raw water treatment installation of thermal power stations, up to the present time is not used. But, given its significant amount, the sludge is available and cheap mineral filler to the above range of rubbers.

Thus, the use of the proposed mineral filler in rubber-based vinylsilanes rubber based on butadiene-nitrile synthetic rubber and butadiene-α-methylstyrene rubber allows you to reduce the price of rubber, while maintaining its number of important physico-chemical characteristics, to dispose of sludge waste TPP.

The use of sludge generated during liming and coagulation of raw water treatment installation of thermal power stations, the chemical composition of caso3 +MgO+Mg(OH)2+SiO2+Fe(OH)3+Al(Oh)3up to 50% by weight of rubber, as a mineral filler in rubber-based vinylsilanes rubber, butadiene-nitrile synthetic rubber and butadiene-α-methylstyrene rubber.



 

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1 tbl, 2 ex

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2 tbl, 7 ex

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6 cl, 2 tbl, 3 ex

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2 tbl

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1 tbl

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3 cl, 13 ex, 1 tbl, 1 dwg

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2 tbl, 1 ex

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3 tbl

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5 tbl

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1 tbl, 9 ex

Auto tire // 2424910

FIELD: transport.

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EFFECT: low rolling resistance and higher strength.

4 cl, 5 tbl, 48 ex

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