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SKS-1739 / SBR-1739 STYRENE-BUTADIENE RUBBER

DESCRIPTION: Styrene-butadiene rubber SKS-1739 (SBR -1739) is the copolymer of styrene and butadiene manufactured by cold emulsion polymerization using mixed rosin acid/fatty acid soaps, filled with TDAE-type oil and staining antioxidant.

REACH: registered

APPLICATION: SKS-1739 (SBR-1739) is a special-purpose rubber, used in production of high speed automobile tires and heat-resistant conveyor belts.
Rubber should not contain any foreign impurities and must meet the following requirements:

Appearance: briquettes (bales)

Weight: 30.0+/-1.0 kg

Colour: from light-brown to dark-brown

THE PRODUCT MUST MEET THE FOLLOWING QUALITY PARAMETERS:

ParametersStandardTest MethodNote
Mooney viscosity ML 1+4 (100C)50-60ASTM D 1646 (para. 7.2.2)v
Viscosity spread within a batch, units, max6-v
Volatile matter content, %, max0.75ASTM D 5668 (method )v
Oil (TDAE) content, %25-29ASTM D 5774v
Bound styrene content, %38.5-41.5ASTM D 5775v
Ash content, %, max0.6ASTM D 5667 (part )v
Organic acids content, %4.0-6.0ASTM D 5774v
Organic acids soaps content, %, max0.4ASTM D 5774v
Antioxidant content, %:
- VS-1*0.3-0.7method of supplierv
Rheometric Properties according to ASTM D 5289:
- ML, dNm2.1+/-1.0ASTM D 5289vv
- , dNm15.8+/-2.5ASTM D 5289vv
- ts1, min3.9+/-1.0ASTM D 5289vv
- t'50,min7.7+/-1.5ASTM D 5289vv
- t'90,min14.6+/-2.0ASTM D 5289vv


*-product of hexamethylenetetramine and monoalkylphenol condensation.
v- specified in the certificate of quality.
vv- non-rejectable.
Preparation of rubber mixes is carried out in accordance with ASTMD 3185 recipe 1, mixing - according to method A. Mixing mills are prepared according to ASTM D 3182. Rheometric properties are determined according to ASTM D 5289 using an MDR 2000 rheometer (flow meter). Wait time for rubber mix before testing is 2-6 hours.

RUBBER MIX RECIPE AND MEASUREMENT CONDITIONS:

ParametersStandard
Rubber mix recipe in parts by weight acc. to ASTM D 3185, recipe 1:
- Rubber100.00
- Zinc oxide3.00;
- IRB 7 (N330) carbon black50.00
- Sulphur1.75
- Stearic acid1.00
- TBBS (N-tert-Butyl-2- benzothiazolesulfenamide)1.00
Rheometer MDR 2000, measurement conditions:
- Temperature, 160
- Duration, min30
- Oscillation amplitude, deg.+/-0.5
- Oscillation frequency, Hz1.7

PACKING: Rubber briquettes (bales) are packaged in marked PE film (thickness of 0.05 +/- 0.01 mm, melting temperature of 108-112), then in plastic box pallets of 450kg or in plywood containers of 1,080kg, or metal containers of 1,260kg.

TRANSPORTATION: Rubber is transported by all types of transport in covered transporting means in accordance to all rules of cargos transportation standing at transport of this form.

STORAGE: At a temperature not exceeding 30, in dry place free from direct sunlight

GUARANTEED SHELF LIFE: 1 (one) year from the manufacture date. After the expiration of the guaranteed shelf life, the rubber can be used for its intended purpose after confirmation of its conformity to the requirements of this product specification.

 

JSC Synthez-Kauchuk
2013 ǻ