Curable rubber mixture

FIELD: chemistry.

SUBSTANCE: invention relates to a rubber mixture based on oil-filled butadiene-α-methylstyrene rubber and can be used to make industrial rubber articles for different industries - oil refining, pipeline transport, railway transport, as well as household articles. The rubber mixture is prepared by mixing the following components in pts.wt: oil-filled butadiene-α-methylstyrene rubber - 100, sulphur - 2, dibenzthiazole disulphide -1.5, diphenylguanidine - 0.3, zinc oxide - 5, stearic acid - 2, technical carbon - 50 and 0.05-0.5 sodium alginate. Sodium alginate is pre-mixed with powdered ingredients in a powder mixer.

EFFECT: invention increases fatigue endurance of rubber during multiple stretching and reduces heat build-up at constant strain amplitude.

3 tbl, 3 ex

 

The invention relates to the rubber industry, in particular to the rubber mixtures based on oil-filled styrene-α-methylstyrene rubber, and can be used for the manufacture of rubber products for various industries, such as refining, pipeline transportation, railway transportation, household goods made.

Known vulcanicola rubber mixture comprising butadienestyrene rubber, sulfur, di-(2-benzothiazolyl)-disulfide, zinc oxide, stearic acid, N-phenyl-N'-isopropyl-p-phenylenediamine, carbon black and the modifying additive is diepoxide of tetrahydroindene in the amount of 1.0÷1,5 parts by weight (see U.S. Pat. 1763455 the USSR, IPC5C08L 9/06, SC 13/02. The rubber mixture based on butadienestyrene rubber. / Onishenko ZINAIDA, Kasyan LI, Drug VG, Batog AU, Emelyanov P., Severova F, Cats UL, G.A. Sokolov, Parulava L.V.; applicant and patentee of the Dnepropetrovsk state University. The 300th anniversary of the reunification of Ukraine with Russia. No. 4874782/05; Appl. 16.08.90; publ. 23.09.92, bull. No. 35. - 3 C.)used as equivalent.

The disadvantages of rubber mixtures are similar to the low fatigue endurance of vulcanizates during repeated stretching. The modifying additive analogue difficult to manufacture, in addition, she is on the horns.

Known vulcanicola rubber mixture comprising oil-filled styrene-α-methylstyrene rubber, sulfur, dibenzothiazepine, diphenylguanidine, zinc oxide, stearic acid, and carbon black (see GOST 11138-78), used as a prototype.

The lack of rubber on the prototype is a low fatigue endurance of vulcanizates during repeated stretching.

The objective of the invention is to provide a rubber with high resistance to fatigue endurance during repeated stretching.

The aim of the invention is to increase the fatigue endurance of the rubber during repeated stretching.

This objective is achieved in that the rubber mixture comprising oil-filled styrene-α-methylstyrene rubber, sulfur, dibenzothiazepine, diphenylguanidine, zinc oxide, stearic acid, and carbon black, introduced from 0.05 to 0.50 parts by weight of sodium alginate per 100 parts by weight of rubber.

Sodium alginate is environmentally friendly, manufactured from biologically renewable resources additive is a salt of a polysaccharide consisting of residues of β-D-mannurone and α-L-guluronic acids that are in the pyranose form and connected in a linear chain of 1,4-glycosidic bonds. This versatile salt is capable of exchanging cations with salts of heavy metals, as well as absorber is to large amounts of moisture (produced by THE 15-544-83).

Sodium alginate from the point of view of the mechanism of action is protivostojaniem hindering developing for fatigue oxidative processes.

Example 1. On a laboratory roll mill Lb-160/P when the surface temperature of the rolls (50±5)°C and frictions 1:1,27 made rubber compound to prototype and present invention. The rubber mixture conform to the following composition: 100 parts by weight of SKMS-30 apkm-15 (TU 2294-044-48158319-2005), 1,50 parts by weight of 2,2'-dimensionalised (TU 6-14-851-86), to 0.30 parts by weight of diphenylguanidine technical grade (THE 2491-001-43220031-2001), to 5.00 parts by weight of zinc white dry brand BCOM (GOST 202-84), from 2.00 parts by weight of stearic acid technical (stearin) brand T-18 (GOST 6484-96), 50,00 parts by weight of carbon technical grade P 245 (GOST 7885-86), from 2.00 parts by weight of sulfur Crystex FROM 33 firms "Exsys", from 0.05 to 0.50 parts by weight of sodium alginate company "Queisser pharma".

For uniform distribution of a small additive - sodium alginate - was previously prepared its mixture with powdered ingredients: sulfur, dimensionalisation, diphenylguanidine, zinc oxide, technical carbon in a special mixer powders (PT Russian Federation, IPC7B01F 9/00. Mixer powders / Lysov DS., Bagaev, S., Bagaeva NB; applicant and patentee of the State educational institution of Vyatka state University. No. 2007103454/15 (003723); Appl. 29.01.07; publ. 27.11.2008, BJ is. No. 33. - 5 C.). The vulcanization of the rubber mixtures was carried out for 40 min at a temperature of (143±3)°C.

Table 1 shows the comparative characteristics of rubber compounds and rubber on the prototype and the present invention.

From table (1) shows that the introduction of small additives (sodium alginate) leads to an increase in fatigue endurance during repeated stretching at 62%, tear resistance by 19%, nominal tensile strength of 24%, and elongation at break of 15% while reducing heat buildup in the mode of constant amplitude strain of 16%.

Example 2. On a laboratory roll mill in accordance with the first example of preparing a rubber mixture according to the prototype and the present invention. Sodium alginate was taken in the amount of 0.15 parts by weight per 100 parts by weight of rubber. The vulcanization of the rubber mixtures was carried out for 60 minutes

Table 2 shows the comparative characteristics of rubber compounds and rubber on the prototype and the present invention.

From table (2) shows that the introduction of small additive sodium alginate increases the fatigue endurance during repeated stretching at 70%.

Example 3. On a laboratory roll mill in accordance with the first example of preparing a rubber mixture according to the prototype and the present invention. Sodium alginate was taken in the amount of 0.20 parts by weight per 100 m is SC the rubber. The vulcanization of the rubber mixtures was carried out for 60 minutes

Table 3 shows the comparative characteristics of rubber compounds and rubber on the prototype and the present invention.

Table 1
Comparative characteristics of rubber compounds and rubber on the prototype and the present invention
Name of indicatorThe content of sodium alginate per 100 parts by weight of rubber parts by weight
prototypeaccording to the invention
-0,050,150,50
Plasticity, damage0,430,420,450,39
The Mooney viscosity (MB 1+4, 100°C) on plastometer PMGI, unit Muni59575762
The ability to premature vulcanization at 140°C in plastometer PMGI:
Minimum torque, a unit Muni40403942
The start time of podocarpaceae t5, min10,3the 9.78,58,3
Speed podocarpaceae Δt, min2,52,52,22,5
Conditional stress at elongation of 100%, MPa3,33,44,13,5
Conditional stress at elongation 300%, MPa14,715,016,616,0
Conditional tensile strength, MPa21,6of 21.226,824,1
Elongation at break, %410410470 440
Relative residual elongation, %27271616
Tear resistance, kN/m53636261
Hardness, units70707270
Fatigue resistance to repeated tensile deformation, 150%, puncture), thousand cycles1,32,01,72,1
Ball rebound resilience, %21232119
The increase in sample temperature, °C25242421
The residual strain, %3,01,41,41,4

Table 2
Comparative characteristics of rubber compounds and rubber on the prototype and the present invention
Name of indicatorRubber compound
prototypeaccording to the invention
The Mooney viscosity (MB 1+4, 100°C) on plastometer PMGI, unit Muni6161
The ability to premature vulcanization at 140°C in plastometer PMGI:
Minimum torque, a unit Muni4646
The start time of podocarpaceae t5, min7,258,00
Speed podocarpaceae Δt, min2,252,27
Conditional stress at elongation of 100%, MPa4,33,7
Conditional stress at elongation 300%, MPa16,3
Conditional tensile strength, MPa19,018,7
Elongation at break, %330340
Relative residual elongation, %108
The ageing factor conditional on the stress at elongation of 100% (100°C, 72 h), %7698
The ageing factor for conventional tensile stress (100°C, 72 h), %-11-10
The ageing factor relative elongation at break (100°C, 72 h), %-41-42
Tear resistance, kN/m4944
Fatigue resistance to repeated tensile (warp 100%, puncture), thousand cycles2,03,4

Table 3
Comparative characteristics of the prototype and to the invention of rubber compounds and rubber
Name of indicatorRubber compound
prototypeaccording to the invention
Plasticity, damage0,340,36
The Mooney viscosity (MB 1+4, 100°C) on plastometer PMGI, unit Muni5856
The ability to premature vulcanization at 140°C in plastometer PMGI:
Minimum torque, a unit Muni5143
The start time of podocarpaceae t5, min7,50scored 8.38
Speed podocarpaceae Δt, min3,253,03
Conditional stress at elongation of 100%, MPaa 3.94,1
Conditional stress at elongation 300%, MPa 16,3the 17.3
Conditional tensile strength, MPa18,718,9
Elongation at break, %350330
Relative residual elongation, %99
The ageing factor conditional on the stress at elongation of 100% (100°C, 72 h), %6957
The ageing factor for conventional tensile stress (100°C, 72 h), %-15-10
The ageing factor relative elongation at break (100°C, 72 h), %-42-35
Tear resistance, kN/m4339
Hardness shore a, srvc. units6666
Fatigue resistance to repeated tensile (warp 100%, puncture), thousand cycles1,5a 3.9
The temperature increase, °C2017
The residual strain, %1,62,0

From table (3) shows that the introduction of small additive sodium alginate increases the fatigue endurance during repeated stretching at 160%, while reducing heat buildup in the mode of constant amplitude strain of 15%.

Special experiments it was found that the addition in the amount of less than 0.05 parts by weight and (or) more of 0.50 parts by weight of sodium alginate per 100 parts by weight of rubber does not have a positive effect, therefore, the dosing interval of sodium alginate clearly identified. The most effective additive of sodium alginate in an amount from 0.15 to 0.20 parts by weight per 100 parts by weight of rubber.

Thus, the rubber mixture according to the proposed technical solution is more favorable consumer properties based on high quality and lower price.

Vulcanicola rubber mixture comprising oil-filled styrene-α-methylstyrene rubber, sulfur, dibenzothiazepine, diphenylguanidine, zinc oxide, stearic acid, and carbon black, characterized in that it further contains sodium alginate in the following ratio of ingredients, parts by weight:
oil-filled styrene-α-methylstyrene rubber100sulfur2dibenzothiazepine1,5diphenylguanidine0,3zinc oxide5stearic acid2carbon50sodium alginate0,05-0,50



 

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