SU975732A1 - Rubber stock based on 4,4'-isopropylidenediphenol rubber - Google Patents

Description

connection groups | g ff and lit causes a high degree of immobilization of thermo-oxidative degradation at all stages of processing and exploitation of the vulcanizable rubber mixture. significantly improve the quality of manufactured products and reduce their cost, Pr and mer. 1. Prepare a rubber mixture following the composition, mac.h .: Natural rubber light crepe (NC) Stearin1 0 Zinc oxide30 0 OK 3 O Mel40., O TiuraM0 4 Sulfur 2.0 Stabilizer Variable Amount Table 1 shows the physicomechanical 17 kaets of the rubber mixtures containing the proposed system of stabilizers and the product NG-224b and vulcanizates of them. mixture of the following composition, mac.h; Isoprene rubber SKI-ZS, 70.0 Butadiene-styrene-. rubber SKS-ZOARKIN30 0 Stearin1., O TiuramO-, 11 Kaptaks2., O Zinc oxide 5 0 Titanium white HI: O Mel42 0 Litopon20 0 Sulfur1.8 Stabilizer Variable Amount Table 2 shows the physicomechanical indicators and vulcanizates {143c) 40). Froze A rubber compound is prepared for advanced rubber glued footwear of the following composition, wt.h: SKS-ZO ARKPN 30., 556 SKI-3 NT. Kaolin36,111 Kaptaks2,333 Steg rin1,000 Separated chalkZb., Sulfur1,792 Stabilplast-B2 Thiuram 0,194 Zinc white Stabilizer 1,000 Shore-made vulcanizates obtained at 40 have the indicators given in Table 3. From the above examples it follows that The use of the proposed stabilizer system provides an increase in the stability of vulcanizates during thermal oxidation, and also increases the resistance to their repeated deformations (stretching) as compared to that used. Since the proposed system of stabilizers is 1.5–2 times cheaper than the known one, and the properties of rubbers with it are improved, the use of such a system of stabilizers will provide a significant economic effect. The introduction of the proposed rubber mixture into production does not require a change in technology and its production can be carried out on the well-known Equipment. Table

Properties unvulcanized mixtures

Resistance of compounds to vulcanization prep, at, min

Vulcanizate properties

Tear resistance, MPa 17.4

18

18

19.8

19.8

18.1

Relative extension , %

Residual elongation,%

Thermal coefficient

aging

at 90 C for 3 days.

Resistance to repeated stretching (100%), thousand cycles until the sample breaks

Resistance to aging in a free state.

natural aging coefficient for strength for 90 days. .:

thermal coefficient

aging at

in 48 hours

Tear resistance, MPa 16.4 Relative elongation,% 670 residual elongation,% 28

Continued table. one

800 20

800 20

0.76

0.61 32.6 55.9

0.78

0.81

0.71 0.66

T a b l and c a 3

17.7 670 27

Radiation resistance, kg / cm

Yoru hardness

The coefficient of thermal aging, strength at h

Wear resistance (GOST 9026-74), min

Continued table. 3

12.5 46-47

0.85 600

Claims (1)

Claim The rubber composition based on diene rubber comprising curatives white filler, softener and non-staining antioxidant, wherein ,, that, in order to increase the resistance to heat aging of the mixture of rubbers, the latter as a _non} okrashrvayuschego antioxidant composition comprises from mono-, bis-, u_ Tris - phenols of the following formulas I, H-uh, with a weight ratio ρ s hs correspondingly (5-25) :( 65-80) :( 5-20), and 30 components, mixtures are taken in the following quantity wt.h: Diene rubber100 Light filler 20-80 Softener 2-8 35 vulcanizing group 2.5-11.5 Specified Antioxidant 0.5-2