SU381269A1 - Method of preparing polyorganosiloxanes - Google Patents

Description

The invention relates to the preparation of linear polyglynosiloxanes containing akl ko kon groups. (Framed. These polymers can be used as components of high temperature resistant compounds and rubber mixtures. A method of polyorganosiloxane synthesis by the condensation of silicon ororganic diol from organic compounds is known. Contains a bond nitrogen silicon.

In order to obtain polymers as k; RemInYyorg, a nitrogen compound with a nitrogen-silicon bond, they contain compounds containing alko, xyrgum, of the general formula:

RR2Si () 2 silt, and (),

whereX - 3, 4;

R, R is alkyl, aryl;

R2

And lko KS and groups and.

These compounds can be used in a mixture with the Dorgano derivative of the general formula R2Si () 2 or (R2SiNH) x. The resulting reaction is ammonia or ammonia (removed from the sphere of the reaction. The resulting lolime; p contains alkoxy-containing fragments of alkoxy-containing siloxane units

may vary in the interval, however, the most appropriate range is 0.5-4.0 mol. %

The reaction temperature ranges from 20 to 150 ° C. The reaction is carried out either without a catalyst or in the presence of a catalyst of an acidic (iHanpHMep, chlorosilane) or unone (for example, dimethylformamide) character. The reaction time is not limited and generally amounts to 1-10 hours. The MO / KiHO process should be carried out at atmospheric pressure or low pressure. Depending on the process conditions, low or high molecular weight polyorganosiloxanes are obtained.

Example 1. A mixture of 150 g (0.013 mol) a, co-polydimethyl € iloxanedol containing 0.30. Weight. % hydrocoyl groups with 3.0 g (0.013 mol) of methylethoxybis (diethylamino) silane are heated with stirring at 50 ° C and a residual pressure of 100 mm Hg. Art. within 4 hours before the formation of a highly viscous mass and then at a temperature of 100-110 ° C and a residual pressure of 20. ILI,; mer. Art. within 1 hour. As a result, a rubber-like soluble polymer with a characteristic viscosity of 0.34 (determined in toluene at 20 ° C) is obtained. Content ethoxy groups, weight. %: 0.39; 0.41. (Set 0.39).

Example 2. A mixture of 15 g (60045 mol) a,: co-polydimethylsiloxane containing 0.94 weight. % hydroxyl groups with 1.02 g (0.0045 mol methylisopropocoibis (diethlamino) silane) are heated with stirring at a temperature of 100 ° C and a residual pressure of 100 mm Hg for 7 hours to form: viscous MaiCCbi, then at 130 ° C and 45 mmHg. (Within 2 hours. A high | KOMOL.kul r, ny POLYMER with a characteristic viscosity of 0.3 (determined in toluene and 20 ° C) is obtained. Contains 1H | Ie isopropoxy, wt.%: 0 , 39; 0.41 (set at 0.39).

Example 3. A mixture of 20 g (0,0092 mol) of dmphenylsilanediol, 6.8 g (0.0023 mol) of octamethylcyclotetrasilazane, 0.38 g

(0.0036 mol) SiN units) mixtures of methyl ethoxysilazanes and 0.68 g (0.0002 mol) to dimethyl forms of ida are heated to 75 ° C with stirring. After 1 hour and after termination of the rapid release of ammonia, the temperature is raised to 120 ° C and (the reaction mixture is kept at this temperature for 5 hours. To complete the reaction, the low molecular weight p-olimer is heated for another 3 (temperature 140

150 ° C at atmospheric pressure and 3 (at the same TeiMiiepaType and a residual pressure of 10 mm Hg.) A high molecular weight polymer with a characteristic viscosity of 1.0 (in chloroform) is obtained.

about/"

(0.72 set

ethoxy groups of 0.68 weight.

weight. %).

Claims (1)

Invention Formula The method of producing polyorganosiloxanes by the reaction of "condensing a silicone diol with organosilicated silicone compounds containing a nitrogen-silicon bond, characterized in that, in order to obtain linear polymers capable of non-sulfuric acid vulcanization, an organosilicon compound with a nitrogen-silicon is used to use a silicon-silica compound that can be used for non-sulfuric acid vulcanization, a silicon-silica compound can be used as a silicone-bonded cure using a nitrogen-silicon compound that can be used for non-sulfuric acid vulcanization. containing alkoxy-group, of general formula: RR2Si (NR32) 2 or (RR2SiNH): c. whereX - 3, 4; R, R - avTkyl, aryl; R is alkoxy.