SU606867A1 - Fluorine rubber-base compound - Google Patents

Description

The invention relates to the rubber industry, in particular to the development of a rubber mixture based on fluororubber. A known rubber blend based on fluororubber, including a vulcanizing agent (bis- and semi-phenols), a catalyst (accelerator) of vulcanization-odd ammonium salt, metal oxide (magnesium), metal hydroxide (calcium), and filler. Vulcanizates (rubber), obtained from a known mixture, have unsatisfactory strength properties. Also known is a rubber mixture based on fluororubber, including urea and thiourea derivatives as a vulcanizing agent, and diamines obtained from known mixtures as a catalyst (accelerator) of vulcanization, also have unsatisfactory strength properties. The purpose of the invention is to increase the strength of vulcanizates of a rubber mixture based on fluororubber. The goal is achieved by using as a vulcanizing agent a compound of the general formula (s-sh) where n is either 2j or S; T And - the same or different H or alkyl; moreover, when rt 1 1, T and T together can be an alkylene radical, with the following ratio of components, weight .4 .: Fluororubber 100 Vulcanizing agent - a compound of the specified formula 0, 5-1,5 The catalyst of vulcanization is a quaternary ammonium salt O, 2-4,5 Magnesium oxide, 3-15 Calcium hydroxide 5-15 As rubber, copolymers of fluoride vinylidene with hexafluoropropylene or with perfluoromethylperfluorovinyl ether or 3-perfluoromethoxyperfluoropropylperfluorovinyl ether are used as a vulcanizing agent, as a curing agent, yKaaacthomelettephyltetrafluoropropylperfluorophenylvinyl ether, as a vulcanizing agent, as a curing agent, yKaaactorhomelettephaethenyl ether, or as a vulcanizing agent. urea, thiourea, ethylene thiourea, biuret and others in the amount of 0.5J, 5 weight.h. per 100 parts by weight, rubber .. The substances mentioned, especially urea, are non-toxic and cheap. As a vulcanization accelerator, triethylben zilammo or ichloride, trietylmethylammonium laurinate and others are used in an amount of 0.24, 5 parts by weight.

Vulcanization is carried out in the usual way in a press at 150-180 ° C for 10-30 minutes and then in a thermostat at 2OOe for f4 hours, in the recipe of mixtures, fillers, oxides and metal hydroxides and other ingredients are used.

Examples 1-9, For the vulcanization, a copolymer of fluoride vinylidene with hexafluoroprodil in an amount of 100 parts by weight, and also 0.5 weight parts of a triethylmethyl ammonium monurinate accelerator, 3 weight parts, is used. magnesium oxide, b weight. . calcium hydroxide and 15 wt.h, soot PGM-33. Urea, thiourea, ethylene thiourea, biuret, and hydroquinone are used as a crosslinking agent for comparison.

The properties of the obtained vulcanizates depending on the type of crosslinking agent are given in table. one.

As a crosslinking agent (table. And 2) in examples 1 (10) use 6.8 wee.h, hydroquinone (known mixture), in examples 2-4 (11-13), respectively, 0.5 1 and 1.5 weight . h. urea, in examples 5-7 (14-16) - respectively 0.5; 1 and 1.5 weight.h. thiourea, in examples 8 (17) - 1 weight.h. biuret and in examples 9 (18) - 1 part of ethylene thiourea.

Table

215 310

310 5 10

Examples 10-18, For the vulcanization, a copolymer of fluoride vinylidene with perfluoromethylperfluorovinyl ether in an amount of 100 weight parts, as well as 2 weight, hours, triethyl-45 benzyl ammonium chloride accelerator, weight parts is used. calcium hydroxide, 3 weight.h. magnesium oxides. Elongation 340 320 250 390 elongation,% 400 Residual 10 10 elongation,% 10

270 280 240

260 350 230

ten

15 weight.h. soot PGM-33. Urea, tlomouchein, ethylene thiourea, biuret, and hydroquinone are used as a crosslinking agent for comparison. The properties of the obtained vulcanizates depending on the type of crosslinking agent are given in table. 2,

Claims (2)

Table 2 5 20 330 300: 480 370 10 0 20 20 Examples 19-21. For vulcanization, a copolymer of nitride with 3-perfluoromethoxyperfluoropropylperfluorovinyl ether in an amount of 100 parts by weight, as well as 4% by weight, an accelerator of triethylbenyl ammonium chloride, 6 parts by weight is used. calcium hydroxide, 3 weight.h. magnesium oxide and 15 weight, h. PGM-33 sags. Thiourea is used as a crosslinking agent, as well as hydroquinone for comparison. The properties of the obtained vulcanizates depending on the type of crosslinking agent are given in table. 3. In example 19, 1 weight.h is used as a crosslinking agent. hydroquinone (a mixture is known), examples 20 and 21 are, respectively, 1 and 1.5 weight of thiourea. Table 3 Strength, 55 60 70 kg / cm. Relative elongation,% 200 120 14 Residual Elongation,% 10 55 Thus, the use of the described vulcanizing agents makes it possible to obtain even higher hard vulcanizing rubber, such as a copolymer of vinyl fluoride with 3-perfluoro, with increased strength methoxyperfluoropropylperfluorovinyl ether. In addition, the described vulcanizing agents, in particular urea and thiourea, are cheaper and more accessible than hydroquinone, which allows them to be used for the production of rubber products in mass production. So, from Tab. 1-3, the vulcanizates of the proposed composition significantly (by 20-50%) are superior in strength to rubber characteristics of known mixtures. The invention rubber compound based on fluororubber, comprising a vulcanizing agent, a quaternary ammonium salt catalyst, magnesium oxide and calcium hydroxide, characterized in that, in order to increase the strength of vulcanizates from this rubber mixture, the compound of general formula (vulcanizing agent) C - WH) R. , fl X where "el or 2, Xs.O or, R and are the same or different, H or alkyl, moreover, n 1 and T and T together can be an alkylene radical in the following ratio of components, parts by weight: Fluoro rubber - 100 Vulcanizing agent 0.5-1.5 Catalyst of vulcanization 0, 2-4,5 Magnesium oxide 3-15 Calcium hydroxide 5-15 Sources of information taken into account during the examination: 1. UK patent 1356344, cl. From 3 P, 1974. 2.Patent of Great Britain No. 1352138, class, C 3 P, 1974,