SU854954A1 - Composition based on butadienenitrile rubber - Google Patents

Description

This invention relates to the rubber industry and relates to the development of a composition based on butadiene nitrile rubber. Known composition based on butadcenenitrile. rubber (SKN) $ and oligozfiracrylate, including a filler (soot), a non-reactive plasticizer (dibutyl phthalate) and a chemical conversion initiator, benzoyl peroxide in a ratio of O, respectively, ma.ch.: 100: 20: 60: 50: 1 l. However, this composition does not provide an improvement in technological properties, an increase in its resistance to scorch and an improvement in the physicomechanical properties of rubber. The purpose of the invention is to improve the technological properties of the composition, to increase its resistance to scorch and to improve the physicomechanical properties of rubber from this composition. those di Cr, Re and de di you shte This aim is achieved m, butaennitrilnogo based rubber composition and oligoefirailata comprising -yapolnitel, neaktsionnosposobny plasticizer initiator chemical conversion, as a final mixture composition Sorges izi -geksahlorperaksilola, -2-a and benztiazolildisulfi sulfur sulfur in the ratio of 1: 1-2: 2. with the following ratio of comp. May h .: Rubber100 Filler 50 Non-reactive plasticizer. 30-50 Sulfur Di-2-benzthiazolyl disulfide Oligoethylacrylate (DBT 2 - A (jy-hexachloro-p-xylene (HCHP) 1-2 P P and me I). For the first roller mill, a uterine-based mixture is prepared. Sutadiene nitrile; SKN-26 100 wt.hour rubber feet fill l-inactive carbon black PM-1595 parts by weight, solid carbon IIM55 wt.h.n target additives (zinc oxide, paraoxine ozone, stearin). To evenly distribute the body in rubber, it is necessary during the introduction, simultaneously with the carbon black, add plasticizer dibutyl phthalate (DBP) and or oligoether acrylate ( FEA.) In the absence of a plasticizer, quality mixtures will not be obtained. In this series, the experimentoB as an OEA composition contains oi., UJ -dimethylacrylate- (bis oxyethylene) phtapate (MGF-1) T-vulcanization-initiating group according to the invention, after mixing of all other ingredients. The recipe is shown in Table 1, rpactfti 10-13. The compositions are prepared in a similar way by a known method, for which instead of vulcanization-initiation groups of the invention are introduced organic peroxide-benzoyl peroxide (Table 1, columns A and 5) . For comparison, in the same conditions, control compositions are prepared, which are used in the rubber goods industry (RTI). They do not contain reactive plasticizers, and as a volcano group they contain a mixture of sulfur DBTD and thiuram in different proportions (Table 1, columns 1-3). Prior to vulcanization of the composition, its viscosity, plasticity, and scorch resistance are determined. The test results are shown in table 2. The vulcanization of the mixtures was carried out in an electric press under a pressure of 150 atm. For 15 minutes at 150 ° C (optimum vulcanization). The results of the main physico-mechanical tests of the vulcanizer are given in table 2. From the data of Table 2 it follows that the introduction of OEA MGF-1, in addition to the non-reactive plasticizer DBP, significantly reduces the viscosity of the composition and increases its plasticity in comparison with the control mixture. Using OEA without DBP does not provide the necessary reduction in viscosity. The use of vulcanizing stones by initiating groups significantly (by a factor of 2–3) increases the viscosity build-up time when compared to the known and control mixtures and virtually eliminates the lodvulcanization of the experimental composition during processing; Thus, the physicomechanical indicators of the vulcanizates of the proposed compositions (conditional strength, elasticity, hardness are not inferior and even exceed the corresponding characteristics of the control and known compositions. Example 2. Prepare compositions according to Example 1, but instead of OEA MGF-1 are introduced 20 lb. of CEA-c6, Cd-dimethacrylatetrioxy of ethylene (TGM-3). The test results are shown in Table 1 (columns 14-16). As can be seen from Table 1, the computations with TGM-3 j are superior in all indicators of the control and known composition. Increasing the dosage DBTD reduces the time of scorching and increases the likelihood of scorching Example 3. Prepare a composition according to Example 2, but enter 20 wt.h. of a mixture of TShch-Z and MGF-1 in a 1: 1 ratio as an OEH. 1 (column 17). A composition containing a mixture of reactive OEA surpasses the known composition in terms of the complex of indicators and is not inferior in properties to compositions containing individual OEA, but under the condition that the ratio of the dosage of the components in the vulcanizing-initiating group is observed (see table. one) . Example 4. The composition according to example 1 is prepared, but the ratio of the components of the vulcanizing Fpyn table (table 1, columns 6-10) varies. As follows from the test results, the absence of one of the components of the vulcanizing group either reduces the sweep time or does not provide a sufficient level of physical and mechanical properties. Only the obligatory introduction of the ternary system (GHPK, DBTD and sulfur) into the composition ensures the achievement of the required level of properties over a complex of all indicators. Example 5. Compositions were prepared in a rubber mixer at 70 ° C. The recipe is given in table.3. In this series of experiments, CKH-I8 rubber and an inactive carbon black, PM-15, and a reactive plate of the fixer - MGF-G are taken as elastomeric axis. Target additives are introduced into the mixture: scavenger inhibitors, accelerators and vulcanization activators, softeners, etc. as well as initiating the Vulcanic group, tf of the experimental compositions vary the content of OEA and filler. A composition according to a known method contains dicumyl peroxide as an initiator. The control composition is a serial formulation used in production. As in the example. viscosity, plasticity and resistance to scorching are determined. The next composition is vulcanized at 5 minutes in an electric press (oltimum vulcanization). The basic physicomechanical properties of vulcanizers are determined by their swelling ability in environments and aging and frost resistance coefficients. The test results are shown in table 4. It follows from them that rfo to the complex of indicators the test mixtures according to the invention are significantly superior to the control one and are not inferior to that of the known, and in the range while 4 pumps (viscosity, time of vulcanisation) even exceed it. . Example 6. Compositions are prepared as in example 5, But SKN-40 rubber is taken as the epastomeric base. Redeptura and basic properties are listed in Tables 5 and 6, respectively. It follows from tabl.b that the experimental composition is superior in resistance to the base of the Swing and not known from the rest of the indicators. . . . Thus, a composition based on butadiene nitrile rubber, containing a large amount of filler, can be easily recycled when OEA is introduced into it, and processing rubber is oligomeric. Composition containing a triple vulcanizing agent (initiating system consisting of a mixture of sulfur and specified This composition is superior to the well-known complex of properties. When rolling and vulcanizing the coagulant, no unpleasant odor was found, which is characteristic of the known compositions, The advantages of the proposed position are most pronounced in highly filled mixtures for the production of products with increased verity. Peroxide - 0.5 dicumyl OEA MGF-1 10 Technical carbon PM-15 120 120 I20 Masterbatch composition, wt.h. : Santofpeks UR I; paraoxyeoso stearin 1; phthalic achydride 0

Properties

Known

.. Mooney viscosity at, uel. 86 Plasticity according to GOST 415-73, 0.17 conventional units 0.12 Time before the start of scorching at 12 (fC), min6.5 Conditionality 12, 0 11.5 ness, MPa. 12.5 Relative 150 ISO lengthening, Z 150 l

Compositions

Proposed 60 15.9 2 2 2 2 2 2 2 2 20 20 50 20 160 50 120 120 120 SKN-18 100; zinc oxide 7.5; n t, aldol-p-iaftylamine 4; ,five; DBF-30. T a b l and c a 4 68 45 65 55 65 0, t9 0.28 a, 15 0.35 0.23 14.5 15.0 17.0 16.5 10.0 13,011.0 11,014.0 9 , 8 J50 220 160 140 150

13

Properties

14

854954 Prodolhend tab and 4

HTS is the same w elongation,% 8 44

Hardness

TM-2, conventional units 75.7.771 Thermal aging coefficient at 70 ° C, 144 hours relative to the relative elongation 1.0 Frost resistance coefficient for elastic recovery Swelling 24 hours

benzene-benzene, 20.5 19 18.5 17.5

AMG-10 oil, 70 ° С 4.5 3.5 3.5 3.0

Sulfur

DBTG GHPK

Peroxide dicumila

OEA MGF-1

 The composition of the uterine mix, yas.ch .: SKN-40 100; carbon black PM-15 120; zinc oxide 7.5; sanitary phones 1; Paraoxineosone G; aldol-naphthylamine 4; stearin 1, DBP 40.

eight

78 60 70 75

74 0.98 0.96 0.60 0.66

18.0 16.0 3.5 .2.5

Table 5

2 2 G

2 20

20 1.0 - 0.98 0, 70 - - 0.40

Claims (1)

24 h.% Claim Rubber Too Filler 50-160 Butadiene-based composition Non-reaction Nitrile rubber and oligoef capable pla- Lata, including filler, nereak · typhifier 30-50 Dionic plasticizer and ini- Oligoepiracri- a chemical transformation cytator, about t- lat 5-50 matching that, with> Sulfur 2-4 to simultaneously improve Di-2-benzthiazo- technological properties of the composition, lildisulfide 2-4 increase its resistance to volcanoes - (JU-hexachloro-p- Nation and improvement of physical and mechanical xylene 1-2 properties of rubbers from this composition, as an initiator of the chemical transformation of the composition contains a mixture. / From U) -hexachloroparaxylene, di-2-benzothiazolyl disulfide and sulfur, taken in a ratio of 1: 1-2: 2, in the following ratio of components, parts by weight: