SU1310407A1 - Method for producing rubber stock - Google Patents

Abstract

The invention relates to rubber industry, in particular to a method for producing a rubber mixture, and can be used in the manufacture of rubber products that are resistant to abrasion. The invention makes it possible to reduce the viscosity of the rubber mixture and to increase the wear resistance of the kanisate from it due to the fact that the mixing in the second stage is carried out in a rubber mixer for 10-60 seconds under the pressure of the upper press with subsequent pressure release and reapplication of pressure over time. not exceeding 60 s before unloading or at the time of unloading. Table I sl 4; About 1

Description

The invention relates to rubber industry, in particular, to a method for producing a rubber mixture and can be used in the manufacture of rubber products resistant to deistriction.

The purpose of the invention is to reduce the viscosity of the rubber compound and increase the wear resistance of the vulcanizate from it. , fp

The method is tested on a tread rubber compound, mac.h.: isoprene rubber SKI 3-50,0; SKD 30.0 butadiene rubber; SCS 30 butadiene styrene rubber; ARKM 15-: 15 20.0; sulfur 1.7; sulfo-amide accelerator C 1.6, anti-scorching - phthalic anhydride 0.5; activator - zinc white 5.0, emollients - 2: 5, technical carbon 56.0, antioxidant 20 (acetonanyl and diaphenFP) 1.5, In the first mixing stage, masterbatches are obtained in a PC-blender 250-40 by mixing caoutchouc, activator, antiscorping 25 with technical carbon, softener, then unload, cool the masterbatch and mix in the second stage with sulfur, accelerator, anti-aging agent, unload the mixture from the 30-sine mixer and the subsequent volc - low.

Example 1 (Comparative), Mixing in the second stage is carried out under pressure by a known method, i.e. j loading masterbatch, sulfur, accelerator, antioxidant and unloading at 105 ° C.

Example 2 (The proposed method). The materials loaded into the rubber mixer 40 according to Example 1 are mixed under the pressure of the upper press for 10 seconds, then the pressure of the press is removed and 60 seconds before unloading, the pressure is applied to the upper 45 press again. Unloading the rubber mixture at 105 ° C. Due to the intermediate pressure, it is possible to reduce the rate of increase in the temperature of the mixture and thereby increase the residence time of the mixture in the mixer 50 by 40 seconds.

Example 3 (Control). Lame in the second stage is carried out according to example 2 by pressing the materials for 6 seconds, then relieving pressure at 55 seconds and reapplying pressure at 70 seconds prior to unloading at 105 ° C. May not be less (less than 10 seconds) collecting the rubber mixture in the chamber, and generally conducting the process of pressurizing at the beginning of less than 10 s and re-applying pressure earlier than 60 s before unloading the mixture will delay mixing in the second stage and decrease the productivity of the process.

Example 4 (Average values of the boundaries of the proposed method). The loaded materials are mixed under pressure of the press for 20 seconds and 35 seconds before unloading (at 105 ° C) the press is lowered. The blending is extended by 20 seconds, which, as in Example 2, has a beneficial effect on the quality of blends and rubbers, but keeps the total duration of the blending cycle unchanged.

PRI and MERP 5. Loaded materials are mixed under pressure of the upper press for 60 s, the press is raised and pressure is applied at the moment of unloading the mixture. The mixing time is extended by 20 s.

Example 6. Get tread mixture of the following composition, wt.h .: SKI-3 20; SKD 40.0; SKS 30 ARKM-15 40.0 ;, sulfur 1.5, sulfenamide P 1.2; zinc white 5.0; hex-salt of SV 0.8; lubricants 23.5; carbon black 65, anti-aging 3.0.

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The mixing is carried out according to the mode of the example.

Example 7 "The mixture according to example 6 is obtained by the proposed method according to example 2,

Example 8: A blend is obtained for retreading the protectors, by weight, mash: SKI-3 30.0; SKMS-30 ARKM-15 70; sulfur 2-1, sulfenamnd 1.5, zinc white 5.0; stearin 2.0; lubricants 21.5; technical corner | | Lerod-1M-50 58.0; antioxidant 3. Mixing, as in example 1.

Example 9, similar to example 8, according to the pre, folded method of example 2,

Example. 10. The proposed method is carried out on a rubber mixture on the basis of SKI-3 of the following composition, wt.h .: 100.0; sulfur 1.8; al-taks 0.8; zinc white 5.0; stearin 2.0; softeners 10.0; technical carbon IIM-50 30.0 DT-100 15.0; b €; la soot BS-120 5.0, protivostari 3: i3

tel 1.0. Get the mixture in two stag days, as in example 1.

Example 11. The mixture of example 10 receive, as in example 2.

Properties of mixtures and rubbers in examples 1-11 are shown in the table.

Claims (1)

Invention Formula The method of obtaining a rubber mixture based on unsaturated rubber by making, in the first stage, a matte mixture from rubber, an activator, antiscoring — with technical carbon, softeners, followed by unloading, cooling the masterbatch Editor I. Segl Nick Compiled by L.Reutova Tehred M. Morgental Proofreader S. Shekmar Order 186b / 25 Circulation 438Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 74 and mixing it in the second stage with sulfur, accelerator, antioxidant and final unloading from the rubber mixer with subsequent vulcanization, characterized in that, in order to reduce the viscosity of the rubber mixture and reduce the durability of the vulcanizer from it, the mixing in the second stage is carried out in rubber the mixer for 10-60 seconds under the pressure of the upper press, followed by depressurization and re-applying pressure for a period not exceeding 60 seconds before unloading or into the Mix Unloading Nom.