SU751822A1 - Polyorganosiloxane liquid-based composition - Google Patents

Description

7518224

Table 1

34.5 111 543

330O

3300.1

34.5

HS-2-1 + copper salicylalanilinate

XC-2-1 + copper salidyl parabromanilinate

330 0.01

34.5 34.5

0.05 34.5

-0.10

 0.20 34.5

№7 250 O

33.7

250 0.05

33.7 0.10 33.7

0.20 33.7

№7 300 About

33.7

300 0.05

33.7

0.2 33.7

table 2

39,296

4963344

4362226

424771 161

4369139

65 120

146

45

84 131

52 53 52

239

116 59 73

38

41 65 77 53 63

59 101 369

130 242 500

58 45

Claims (1)

86 54 64 91 140 As can be seen from the results presented in Table 1, the thermo-oxidative stability (time to gelation) of a polymethyldichlorophenylsiloxane liquid increases with the addition of divalent copper salicylate. Noteworthy is the fact that an increase in the concentration of the additive leads to an increase in thermal stability. This indicates a non-chain inhibition mechanism. At the same time, the thermal stability of CS-2-1 at 350 ° C is more than doubled. Additional data confirming the high thermal stability of the compositions of polyorganosiloxane fluids with bivalent copper salicytal alanilates were obtained by studying the dependence of their viscosity on the time of thermal oxidation (Table 2). The data obtained indicate that the compositions of polyorganosiloxane liquids with copper salicyllalanilinates are significantly superior in their thermal stability to the characteristics of the initial liquids, which manifests itself in a decrease in viscosity at one and the same thermal oxidation time. At f330 ° C, the cholesterol-2-1 fluid has a viscosity 543 eats, and the cholesterol-2-1 + 0.2% copper salicyl alanilinate composition has only 60 eats, which is 9 times less. Similar results were obtained for polyethylsiloxane liquid No. 7. From the data of Table 2 it can be seen that increasing the temperature from 250 to not only does not decrease the effectiveness of the antioxidant, but also significantly increases. So, after 3 hours of thermal oxidation of the composition of the liquid 7 + 0.2% salicylalanilinate, copper at 250 and 300 ° C, the viscosity hardly differs (52 and 54 eats), while the viscosity of the pure liquid is 120 and 369 eats, which 2.5 and 7 times more. Thus, the results obtained indicate that the addition of divalent copper salicyl alanilates not only increases the thermo-oxidative stability of polyorganosiloxane fluids, but also extends the temperature limits of their use. DETAILED DESCRIPTION OF THE INVENTION Composition based on polyorganoyl oxane liquid and antioxidant, characterized in that, in order to increase thermo-oxidative stability, as an antioxidant, it contains divicylalanilinates of divalent copper of the general formula O-CufZ where RH, Br, N0, 0.01-0%, 2% by weight of fluid. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 539057, cl. C 08 L 83/04, 1976 (prototype).