RU2088609C1 - Vulcanizable mixture based on the dispersed waste of tire manufacture - Google Patents

Abstract

FIELD: rubber industry. SUBSTANCE: in mixer the following components were mixed at 70-80 C, mas. p. p.: "HK"-base rubber crumb, 100; sulfur 3; 2-mercaptobenzthiazole, 1.5, and ammonium stearate, 2. Mixture is pressed as plates - thickness is 2 mm at 160 C x 10 min, 35 mm at 160 C x 70-80 min, or at 180 C x 60 min. Plate properties: rupture resistance is 6.5 MPa, relative elongation is 120%, hardness is 68-75 conventional units. EFFECT: improved quality and property of mixture. 1 tbl

Description

 The invention relates to the field of regenerated rubber compounds, for example dispersed products of tire production, for the manufacture of monolithic materials, coatings and other industrial and cultural products.

Known technical solutions for the disposal of regenerated rubber products, especially rubber crumbs formed during grinding of used tire products. For this purpose, sulfuric post-vulcanization of rubber crumb is carried out by introducing sulfur into the vulcanizable mixture in combination with additional ingredients. Rubrax, di- / 2-benzthiazolyl / disulfide / altax / [1] N-cyclohexyl-2-benzthiazolyl-sulfenamide / Santokyur / [2] as well as N, N-diethylbenzothiazolylsulfenamide-2 / sulfenamide BT / and are proposed as such ingredients. / benzothiazolyl-2 / morpholinosulfide / sulfenamide M / [3]
The disadvantages of the known technical solutions are due to the fact that in the case of using a santocure, extremely high sulfur concentrations of 24% with respect to rubber crumb are required (the content of a santocure is 0.74%) [2] and the use of BT and M sulfenamides in combination with sulfur is effective in the presence in the vulcanizable mixture of additional benzothiazolinethione diamidophosphates [3] Therefore, these compositions are analogues of the invention.

 Closest to the essence of the invention is a vulcanizable rubber compound, in addition to crumbs and sulfur, including rubrax, altax, zinc oxide and stearin [1] prototype.

 The disadvantage of the prototype is the relatively low cohesive strength of the vulcanizates: the tensile strength is 3.0-3.5 MPa and Shore hardness (scale A) 50-55 units. This level of the main characteristics of the prototype is due to the fact that in addition to the above ingredients, a resinous waste of phthalic anhydride production is additionally introduced into the composition of the vulcanizable composition in the following general ratio of components, wt. h

Rubber crumb 65 90
Sulfur 1.5 3.5
Rubrax 12 18
Altax 1.6 2.5
Zinc oxide 2.5 3.5
Stearin 0.8 1.1
Phthalic Anhydride Production Waste 10 35.

 An additional disadvantage of the technical solution is the low manufacturability of the vulcanizable rubber compound, due to the resinous waste of the production of phthalic anhydride (sticking to the walls, difficulty in mixing, uneven distribution over the volume of the mixture).

 The essence of the invention lies in the fact that as an accelerator of post-vulcanization of the rubber mixture with sulfur, 2-mercaptobenzothiazole (captax) is used, and as an active modifier, ammonium stearate in the following ratio, wt.h.

Rubber crumb 100
Sulfur 3
2-mercaptobenzothiazole 1.5
Ammonium stearate 2.0.

 Unlike the prototype, the vulcanizable rubber compound contains the only Captax accelerator, and does not include the Rubrax-Altax system in combination with zinc oxide and stearin. At the same time, the mixture includes, instead of a low-tech, resinous waste from the production of phthalic anhydride, ammonium stearate, which is easy to introduce into the system by simply mixing its components. Ammonium stearate almost completely interacts and does not lead to the formation of secondary products of various transformations. At the same time, it plays the role of a surfactant that intensifies interfacial processes in the vulcanizable mixture and, therefore, increases the level of cohesive characteristics of vulcanizates.

 These differences determine the significant novelty of the subject invention in comparison with the prototype [1] The proof is the lack in the literature, including the patent, of information on the use of ammonium stearate in combination with captax and sulfur for post-vulcanization of dispersed tire waste.

 Ammonium stearate is non-toxic, available, produced on an industrial scale. In contrast to the waste, which is part of the prototype, it is characterized by a constant composition, which determines the possibility of a systematic prediction of the properties of the final vulcanized products.

 The possibility of carrying out the invention is confirmed by the following example.

Example. In a standard mixer at a temperature of up to 70-80 ^o C mix the rubber composition, wt. h

Rubber crumb based on NK 100
Sulfur 3.0
2-mercaptobenzothiazole 1.5
Ammonium stearate 2.0.

The prepared mixture is pressed according to the following modes: plates with a thickness of 2 mm at 160 ^° C for 10 minutes, plates with a thickness of 35 mm at a temperature of 160 ^° C for 70-80 minutes or at a temperature of 180 ^° C for 60 minutes The measurement results of the physical and mechanical properties of the manufactured plates according to standard techniques are shown in the table along with the characteristics of the prototype.

 Thus, the above data indicate that, according to all necessary features, the proposed technical solution meets the requirements for inventions.

Claims (1)

 A vulcanizable mixture based on dispersed waste from tire production, including sulfur, an accelerator and a vulcanization process modifier, characterized in that it contains 2-mercaptobenzothiazole as an accelerator and ammonium stearate as a modifier in the following components, wt.h. Dispersed tire waste 100
Sulfur 3
2-Mercaptobenzothiazole 1.5
Ammonium Stearate 2T

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