RU2223980C2 - Rubber compound preparation method - Google Patents

Abstract

FIELD: rubber industry. SUBSTANCE: rubber compound is prepared by providing first at least two mother blendes containing rubber and differing from each other by composition and/or amount of components contained therein, after which curing system supplemented by 5-25% rubber is added. EFFECT: simplified technology and enabled manufacture of unlimited number of rubber grades from limited number of mother blends. 4 tbl, 4 ex

Description

 The invention relates to a method for producing a rubber mixture using masterbatches.

 A known method of producing a rubber mixture by mixing in the first stage of rubber with carbon black and other components of the mixture with the exception of the vulcanizing group, which is introduced in the second stage of mixing [Technology of rubber products under. ed. P.A. Kirpichnikova, M., Chemistry, 1991, p. 352]. However, in the production of a large number of grades of rubber compounds, many masterbatches (first stages) are required, differing from each other in composition and / or in the number of components contained in them. All this does not allow to unify the weight of the components of the mixture, thereby complicating the technology for the production of rubber compounds.

 The closest solution (prototype) to the claimed invention in terms of features is the invention SU 979399 A, which proposes a method for producing a rubber mixture by first mixing rubber with carbon black and then introducing other components of the mixture and part of the polymer into the resulting masterbatch. However, to obtain each brand of rubber mixture, its own masterbatch with a certain ratio of rubber: filler, as well as its own weight of other components of the mixture, are required. In this regard, it is impossible to unify the weight of the ingredients of the mixture in the production of a large number of grades of rubber compound. In addition, poor dispersion when introducing vulcanization activators into the second stage, as well as rubber into highly filled masterbatches, leads to unstable physical and mechanical properties of rubbers.

 The objective of the invention is to simplify the production technology and produce from a limited number of masterbatches an unlimited number of grades of rubber.

 The problem is achieved by the manufacture of at least two masterbatches containing rubber and differing from each other in composition and / or the number of components introduced into them, followed by the introduction into the prepared masterbatches of a vulcanizing group or vulcanizing group in a combination of two or more masterbatches with adding to them 5-25% rubber.

Example 1. We hang 19 weights of the rubber compound of the following composition, wt. hours: SKI-3 100.0; zinc oxide - 5.0; stearic acid - 2.0; acetonanil - 2.0; indencumarone resin - 5.0; sulfenamide C - 1.0; sulfur - 2.5; carbon black P 324, the dosage of which is shown in table 1. On laboratory rollers 320/160 we produce 19 masterbatches by the known method, by mixing 75% rubber with carbon black and resin. In the prepared masterbatch, we introduce the remaining ingredients and the remainder of the rubber. Vulcanize in a press with electric heating at (143 ± 3) ^o C plates for 30 minutes, washers - 40 minutes and subject them to physical and mechanical tests, the results of which are shown in table 1.

 According to the proposed method, we make on the laboratory rollers two master batch of the following composition, parts by weight: master batch A: SKI-3 - 100.0; zinc oxide - 5.0; stearic acid - 2.0; acetonanil - 2.0; indencumarone resin - 5.0; carbon black P 324 - 80.0. Masterbatch B: SKI-3 - 100.0; zinc oxide - 5.0; stearic acid - 2.0; acetonanil - 2.0; indencumarone resin - 5.0; carbon black P 324 - 70.0.

 We combine them with each other in proportions, as indicated in table 1, and introduce a vulcanizing group, calculated on 100 wt.h. rubber of the following composition: sulfenamide C - 1.0; sulfur - 2.5. We get 19 grades of rubber compounds, the physical and mechanical parameters of the vulcanizates of which are shown in table 1.

 Example 2. According to the proposed method in the manufacture of rubber compounds in the combination of masterbatches A and B, along with the vulcanizing group, we add from 5 to 25% of the content of masterbatches based on rubber SKI-3. Samples of the vulcanizing group are made based on the total rubber content in the rubber compound. The composition of the vulcanizing group, calculated on 100 wt.h. rubber: sulfenamide C - 1.0; sulfur - 2.5. Physico-mechanical characteristics of vulcanizates from rubber compounds and the amount of rubber added to the masterbatch are shown in table 2.

 Thus, examples 1 and 2 show how it is possible to make 24 grades of rubber compounds from two uterine mixtures A and B, the vulcanizates of which differ from each other in physical and mechanical parameters, and their hardness varies from 50 to 73 conv. units

 To achieve the same results by the known method, it is necessary to hang and make 24 masterbatches that differ from each other in composition and / or the number of components contained in them, in addition, vulcanizates from mixtures made by this method have unstable physical and mechanical properties.

 Example 3. In this example, we show how it is possible to make 5 grades of rubber compounds from two masterbatches, vulcanizates of which have the same hardness value (~ 70 conventional units), but differing from each other in strength indicators (from 6.0 to 20.6 MPa).

 To do this, we make master batch B and D. Composition B, parts by weight: BSK 1502 - 100.0; zinc oxide - 4.0; stearic acid - 2.0; styrene-coumarone resin - 5.0; chalk MMS-2 - 140.0. Composition D, parts by weight: BSK 1502 - 100.0; zinc oxide - 4.0; stearic acid - 2.0; styrene-coumarone resin - 5.0; carbon black P 324 - 55.0.

 The composition of the vulcanizing group, calculated on 100 wt.h. rubber: dibenzotisolyl disulfide (altax) - 1.5; diphenylguanidine - 0.3; sulfur - 2.0.

 Table 3 shows the physical and mechanical properties of the vulcanizates, depending on the ratio of the masterbatches B: D.

 For the production of 5 grades of rubber compounds according to the known method, it is necessary to hang and make 5 grades of masterbatches with different ratios of rubber: carbon black P 324: chalk, that is, different contents in the mixture of carbon black and chalk (see table 3). In addition, the physico-mechanical properties of rubbers from mixtures made by the known method are characterized by instability.

 Example 4. In this example, we show how, according to the proposed method, it is possible to obtain 10 grades of rubber compounds from three masterbatches having the same composition of components except for the rubber grade, the vulcanizates of which are resistant to organic media.

 The composition of the masterbatch: rubber - 100.0; zinc oxide - 5.0; stearic acid - 1.0; carbon black P 514 - 65.0; dibutyl phthalate - 20.0; acetonanil 3.0.

 Rubber grade in masterbatch E - BNKS-18M; G - BNKS-28M; 3 - Bnks-40M. The composition of the vulcanizing group per 100 wt.h. rubber: thiuram D - 2.0; sulfenamide C - 1.0; sulfur - 0.5.

 Physico-mechanical parameters of vulcanizates depending on the ratio of masterbatches E: G: Z in the rubber mixture are shown in table 4.

 Thus, examples 1-4 show how, from a limited number of masterbatches that differ from each other in composition and / or number of components contained in them, it is possible by the proposed method to obtain an unlimited number of grades of rubber compounds, the vulcanizates of which have specified physical and mechanical indicators and resistance to organic environments.

Claims (1)

A method of producing a rubber mixture by preparing at least two master batches containing rubber and differing in composition and / or amount of components contained therein, and then introducing into the prepared master batches a vulcanizing group or vulcanizing group in a combination of two or more master batches with the addition of 5-25% rubber.

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