SU726129A1 - Butadiene nitrile rubber based vulcanized rubber mixture - Google Patents

Description

The invention relates to the rubber industry, in particular to the development of a rubber mixture based on buta-dinitrile rubber. A known rubber mixture based on .butadiene nitrile rubber, comprising a softening polymer based on tetra hydrophthalate, However, the rubber mixture does not have sufficient ductility and resistance to vulcanization, and the rubber from this mixture has insufficient physical and mechanical properties ... Purpose of the Invention increasing the plasticity and resistance of the mixture to subvolcanization while maintaining the physicomechanical properties. This goal is achieved by the fact that a vulcanized rubber mixture based on butadiene nitrile rubber contains 2.5 to 20 parts by weight of polyamide-3-methyl tetrahydrophthalate as a softener. on 1oo weight.h. rubber According to examples 1,4 polyamide-3-methyltetrahydrophthalate (PAMTGP) is obtained by the action of dry ammonia on 3-methyltetrahydrophthalic (3-MTHPA) anhydride. Example 1. In a three-neck flask equipped with a stirrer, 100 g of 3-MTHFA are placed and ammonia is passed in, while the temperature rises immediately. The further process is carried out at 10 ° -10 5 ° C for 2 ° h with a uniform flow of ammonia. The resulting polycondensate in a hot state is poured into a glass. The test product has the following characteristics: Molecular mass. 2750 Acid number, mg KOH / g380 Nitrogen content,% 5.7 Melting point, C 40-45. Example 2. Synthesis was carried out as in Example 1 for 3, O h. The test product had the following characteristics: V ..- ,, ... --- ..-.-.-.... Molecular mass 3000 Acid number, mgKOH / g Nitrogen content,% Melting point, 45-50. Example 3. The synthesis was carried out as in Example 1 for 3.5 hours. The dried product has the following characteristics: Molecular mass Acid number, mgKOH / g Nitrogen content,% Melting point, C 52-55. Example 4, Synthesis is carried out according to Example 2 at 12 ° C. The test product has the following characteristics. Molecular mass: 23OO Kiss: lot number. V, .. mlKOH / g315 Nitrogen content,% 5,1 Melting point, ° С; 413-47. The structure of PAMTGP, established by the method of IR-spectroscopy, is characteristic for polyamides. A strong absorption occurs in the region of 17OO cm, which is due to the stretching vibrations of C – O in the C СОН and С – О groups. Yalichiyo of the secondary aglida tykzhe pidtvyo zhtsyats band 12O5 cm.,:, .. -,. Eb - AAvk t; -., -.- - - -. .-: -, -. In order to determine oi, the result is obtained from Oedi: HeN And they study its effect in rubber compound recipes based on SKN-26M butadiene nitrile rubber. Rubber compounds are made on the basis of 1OO weight parts. SKN-26M with a Defoe stiffness of 750 gs with a gchitel content of 1.5-20 wt.h. Take 0yayyov; 1c (mixture of weight composition, including on OO weight parts of rubber: sulfur 1.3-1.5, captax 0.6-0.8; stShrinva g CW; W T1, 0-2.0; zinc white - 3.0-5.0; PM-100 technical carbon 40-50, softener 1.5-20.,., Example 5. Take a rubber mixture of the composition by weight per 1OO weight by weight of rubber: SKN-26M 100, sulfur 1.5, technical carbon PM-YuO 45, zinc white 5.0, captax 0.8, m hcptel 1.5 are made on laboratory rollers at a temperature of rolls of 5O-6O C. , min: SKN-26M, emollient 3, stearigbva

Claims (1)

72 (M. Acid 2.0, Celite White 5, Captax 7, half technical yi nepona .9, the second turn-around. Carbon 11, Sulfur 15, -cut through 20. Vulcanization of the mixtures is carried out at 143t for 40 minutes Example 6. Composition of the rubber mixture and preparation mode similar to that of example 1 with a softener content of 20 parts by weight In all examples, the introduction of the rubber mixtures was stopped with the introduction of the proposed softener.The mixture without a softener was removed and the introduction of carbon black was difficult. The use of the plasto-elastic properties of rubber compounds the content of the proposed solvent is given in Table 1. Table 2 shows the physico-mechanical properties of the proposed and known rubber compounds. Table 1. Plasticity rio GOST 415-53 0.315-0.38 Elastic recovery, 2.2-1.4 V Mooney viscosity at 12 ° С 47-57 Beginning of the Dulculation of the Rubber Compound (T-10 min), 20-40 min Table 2 Tensile strength at discharge, kgf / cm 2G O-ZOO Resistance 1 (1-7 O tensile strength, 5 7 Presentation of table. 2 Relative 46O-62 elongation,.% Coefficient of thermal aging at 100 ° C for 14Oh,: according to the change in tensile strength at time 0, 66 0.43 0.8-O, 8 ditch Relative 0.44-0 elongation, mm / m. Swelling in gasoline Galosha,% 4.39-4 The number of cycles before cracking during repeated bending 25-35, thousand. The number of cycles before the growth of cracks during repeated bending, 16.6 33-9О. thousand Tables 1 and 2 show that with the introduction of PAMTGP, plasticity increases, elastic recovery and viscosity of rubber compounds decrease. In addition, rubber compounds with a content of up to 10 weight, h, PAMTGF has an increased resistance of mixtures to premature vulcanisation. The swelling of rubber with PAMTGF in gasoline Galosha corresponds to the well-known 9, samples that while it is possible to use it in beesostonquer rivers. PAMTGF exerts a positive effect on the dynamic properties of rubber, increases the resistance of rubber to heat aging. With increasing content. PAMTGF strength properties of rubber do not change. Thus, PAMTGP is advisable to be used in specialty rubber rubbers as a high molecular weight softener, which improves the technological properties of rubber compounds (eliminates the coat hardening of the mixture on rollers, increases the resistance to vulcanisation of the mixtures) and improves some indicators of the mechanical properties of vulcanizates. The formula for the use of a Vulcanizable rubber compound based on butadiene nitrile rubber, including a tetrahydrophthalate-based softener-polymer, characterized in that the latter contains, to increase the plasticity and resistance of the mixture to vulcanization, while maintaining the physicomechanical properties of rubber from this mixture. as a mchitep polyamide-3-megyltetrahydrophthalate in the amount of 1.5-20 weight. h, per 100 weight.h. rubber ... Sources of information taken into account in the examination 1, Report of the laboratory of the Voronezh Technological Institute № 76030957, Voronezh, 1976 (prototype).