Composition for the manufacture of nachalnik rubber gaskets

 

(57) Abstract:

The invention relates to railway industry and can be used to produce compositions for nachalnik gaskets. The composition has a composition, by weight.h.: butadiene-styrene rubber SKS-30-AWS - 100, crushed crumb rubber - 5,0-20,0, target additives: sulphur - 0.5 to 1.5, Altex - 0,5-1,0, zinc oxide is 0.5 to 1.0, stearic acid - 0,5-1,0, plasticizer - 3,0-5,0. Shredded rubber crumb receive the degree of dispersion of not more than 2,0 mm as rubber crumb is possible to use a powder obtained by grinding the worn nachalnik rubber gaskets. The technical result consists in increasing the physical-mechanical characteristics of the composition, the cheaper pads and environmental improvement. 1 C.p. f-crystals, 1 table.

The invention relates to railway industry, namely the construction of Railways, and can be used to obtain compositions for nachalnik rubber gaskets (APCS).

Known composition for the manufacture of APCS consisting of rubber, reclaim, vulcanizing agents and other special additives [TU 32 CPU - 816-95]. In the composition of [THE 32 CPU - 816-95] contents regenerate varies from 25 to 50 wt.h. Under the tion of the regenerate in Russia and CIS countries decreased from 121.4 thousand tons in 1989 up to 20 thousand tons in 1996, a Similar situation is observed in Germany, where consumption regenerate decreased from 20 to 1% and 4,000 t/year [Rubb. a. Plast. News. 1991. v. 21. N 10. p. 9, Europ. Rubb. J. 1991. v. 23. N 1. p. 26]. The reduction in the production of regenerate due to more stringent legislation on the protection of the environment: the majority of regenerating plants closed because of the protests. There are also problems associated with high temperature technological processes, the use of harsh chemicals [H. Schwenke. Kautsch. Gummi u. Kunstst. 1992. Bd. 45. N 1. s. 60-67], power consumption (energy consumption is depending on the type of rubber 1,2-1,7 kWh/person [U. Schmidt., E. Kreipe. Kautsh. Gummi u. Kunstst. 1995. Bd. 48. # 4. s. 244-253]).

All this leads to the fact that from an economic point of view, the use of rubber reclaim is unprofitable and should get rid of the opinion that the use of the regenerate cheaper products [Elastomerics, 1991, v. 123, N 12, p. 11].

In addition, the use of the regenerate deteriorates the mechanical properties of rubbers [Jacek Marguta. Polim. Twors. Wielkoczasteczk. 1993. v. 38. N 3. s. 132-135] .

Prerequisite for the receipt and application of the regenerate (including modified) - economic efficiency and maximum compliance e is to rubber crumb, obtained by grinding waste rubber products [E. M. Soloviev in the book. "Recycling of polymeric materials" Ed. by E. G. Lubelskiej, M.: Chemistry, 1985, 135 C., T. M. aborigina and other Leather and footwear industry. 1989. N 6. S. 40-42]. There are various ways of grinding: either by cutting [E. M. Soloviev and other Rubber and rubber. 1984. N 6. S. 30-31], or by impact deformation comprehensive compression and shear [Author's certificate N 1703468, 1991].

Grinding as a way of recycling waste rubber products, is currently the most promising, because, first, cheaper cost - the cost of carrying out grinding at 30-50% less than the production regenerate [E. M. Soloviev in the book. "Recycling of polymeric materials" Ed. by E. G. Lubelskiej, M.: Chemistry, 1985, S. 135], and, secondly, environmentally safer.

The big problem is the replacement and disposal of waste CHP, because every year we have to replace about 3500 pieces/km Usually still dilapidated APC thrown away or burned, which leads to environmental pollution.

Known rubber composition for the manufacture of railway crossings, including the addition of rubber [E. M. Soloviev in the book. "Recycling of polymeric materials" Ed. by E. G. Lubelskiej, M.: Chemistry, 1985, S. 135].

A disadvantage of the known compositions are low physico-mechanical characteristics.

The technical essence and the achieved result is closest to the claimed solution (prototype) is a composition comprising (wt. h) [THE 32 CPU - 815-95 - prototype]:

Butadiene-styrene rubber SKS - 30 - AWS - 100,0

Reclaim - 25,0-50,0

Targeted supplements:

Sulfur - 3,0

Altex - 0,5

Zinc oxide - 1,0

Stearic acid - 1,0

Plasticizer - 5,0

The disadvantage of this song [THE 32 CPU - 815-95 - prototype] is used as a component of the regenerate, which, as noted, is economically inefficient and environmentally harmful.

The task of the invention is to provide a composition for the manufacture of APCS, allowing you to dispose of worn APC and with high physical-mechanical characteristics, which will lead to cheaper APCS and to improve the environmental situation.

The solution of this problem is achieved by the proposed composition for the manufacture of APCS, including butadiene-styrene rubber SKS-30-Elasticator, which instead of the regenerate in the quality of the product is recyclable rubber contains shredded rubber crumb with the degree of dispersion of not more than 2.0 mm, obtained by grinding the rubber in the following ratio, wt.h.:

Butadiene-styrene rubber SKS - 30 - AWS - 100,0

Crushed crumb rubber - 5,0-20,0

Targeted supplements:

Sulfur is 0.5 to 1.5

Altex - 0,5-1,0

Zinc oxide - 0,5-1,0

Stearic acid - 0,5-1,0

Plasticizer - 3,0-5,0

The composition contains as recycled rubber component CRF obtained by grinding the worn APCS.

As the plasticizer can be used in different standard plasticizers (for example, oil MO-6).

It is known that the mechanical behavior of compositions containing the CRF, is influenced by the type of rubber, the ratio of the modules of phases, the content of the dispersed phase, the degree of dispersion of the IGC, the nature and reactivity of its surface [E. M. Soloviev in the book. "Recycling of polymeric materials" Ed. by E. G. Lubelskiej, M.: Chemistry, 1985, 135 C., T. M. aborigina and other Leather and footwear industry. 1989. N 6. S. 40-42, Elastomerics, 1992, v. 124, No. 1, p. 9].

The CRF for the proposed compaby or elastic deformation.

The composition according to the invention is prepared in the mill or in the rubber mixer. Mixing time 25 minutes From the composition prepared standard plate and vulcanized in a press at a temperature of 140oC and a pressure of 60 MPa for 20 min. Then carry out tests of mechanical properties according to GOST [M M Lesnikowski and other Mechanical testing of rubber and rubber. M.-L.: Chemistry, 1964]. Measure conditional tensile strength (p), elongation at break (p), shore a hardness (H). The requirements for rubber compositions APCS the following:p= = 7.3 MPa,p= 200%, H = 57-72 srvc. unit

Similarly prepare and test compositions with regenerate (prototype).

The test results presented in the table.

As can be seen from the table, examples 1-2, the mechanical characteristics of the proposed compositions are not inferior or superior to the corresponding indicators of well-known compositions for the manufacture of APCS (prototype) containing reclaim [THE 32 CPU - 815-95 - prototype]. In examples 3-5 shows the effect on the mechanical properties of the compositions containing the IGC, with the degree of dispersion of not more than 2,0 mm

With the increasing content of the CRF in the composition above 20 is to increase the degree of dispersion of the CRF more than 2.0 mm and the content of 20 wt.h. a decrease in the conditional tensile strength and relative elongation at break (example 8).

1. Composition for the manufacture of nachalnik rubber gaskets, including butadiene-styrene rubber SKS-30-AWS, the product is recyclable rubber and additives target: sulfur, altax, zinc oxide, stearic acid, and a plasticizer, characterized in that the quality of the product is recyclable rubber it contains shredded rubber crumb with the degree of dispersion of not more than 2.0 mm, obtained by grinding of rubber, in the following ratio, wt.h.:

Butadiene-styrene rubber SKS-30-AWS - 100

Crushed crumb rubber - 5,0 - 20,0

Targeted supplements:

Sulfur is 0.5 to 1.5

Altex - 0,5 - 1,0

Zinc oxide - 0,5 - 1,0

Stearic acid - 0,5 - 1,0

Plasticizer - 3,0 - 5,0

2. The composition according to p. 1, characterized in that the quality of the product is recyclable rubber it contains shredded rubber powder obtained by grinding the worn nachalnik rubber gaskets.

 

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