Perfluoroelastomer gels
A technology of perfluoroelastomer and body gel, applied in the field of perfluoroelastomer composition, can solve the problems of deterioration of sealing performance and heat resistance, and achieve the effects of improving sealing performance, improving mechanical properties and improving heat resistance
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Embodiment A
[0131] Polymerization of perfluoroelastomer latex
[0132] After being evacuated, a 22 l (liter) autoclave equipped with a stirrer operating at 460 rpm was charged with 14.5 liters of demineralized water and 145 ml of a microemulsion obtained by mixing:
[0133] - 32 ml of a perfluoropolyoxyalkylene having an acid-terminated acid end group of the following formula:
[0134] CF 2 ClO(CF 2 -CF(CF 3 O) n (CF 2 O) m CF 2 COOH
[0135] Wherein n / m=10, the average molecular weight is 600;
[0136] - 32 ml of 30 vol% NH 4 OH aqueous solution;
[0137] - 62 ml of demineralized water;
[0138] - 19 ml of Galden of the following chemical formula D02:
[0139] CF 3 O(CF 2 -CF(CF 3 )O) n (CF 2 O) m CF 3
[0140] Where n / m=20, the average molecular weight is 450.
[0141] The autoclave was then heated to 80°C and maintained at that temperature throughout the reaction. Then introduce 35 grams of 1,4-diiodoperfluorobutane (C 4 f 8 I 2 ).
[0142] A monomer mixture...
Embodiment B
[0152] Preparation of semi-crystalline (per)fluoropolymer latex
[0153] After being evacuated, a 10 l (liter) autoclave equipped with a stirrer operating at 545 rpm was charged with 6.5 liters of demineralized water and 260 ml of a perfluoropolyoxyalkylene microemulsion obtained by premixing:
[0154] - 56.4 ml perfluoropolyoxyalkylene having an acid-terminated acid end group of the formula:
[0155] CF 2 ClO(CF 2 -CF(CF 3 )O) n (CF 2 O) m CF 2 COOH
[0156] Wherein n / m=10, the average molecular weight is 600;
[0157] - 56.4 ml of 30 vol% NH 4 OH aqueous solution;
[0158] - 112.8 ml of demineralized water;
[0159] - 34.4 ml of Galden of the following chemical formula @ D02:
[0160] CF 3 O(CF 2 -CF(CF 3 )O) n (CF 2 O) m CF 3
[0161] Where n / m=20, the average molecular weight is 450.
[0162] The autoclave was then heated to 80°C and maintained at that temperature throughout the reaction. Bring the autoclave pressure to 0.6 bar (0.06 MPa) with ethane...
Embodiment 1
[0168] Latex gelation and gel washing
[0169] 8 liters of demineralized water, 3 liters of 95% ethanol in water and 8 liters of the latex prepared according to Example A were added sequentially to a 30 liter jacketed glass reactor equipped with a stirrer. The reactor contents were brought to a temperature of -9°C.
[0170] In another 50 liter jacketed glass reactor equipped with a stirrer, 17 liters of demineralized water, 3.5 liters of 95% ethanol in water and 1.5 liters of 20% by weight aqueous nitric acid were added sequentially. The reactor contents were brought to a temperature of -9°C.
[0171] Under stirring, the contents of the 30-liter reactor were continuously fed into the 50-liter reactor by means of a peristaltic pump, maintaining the temperature at -9°C.
[0172] Stirring was stopped when the addition was complete; the resulting gel separated at the bottom and the upper aqueous phase was let off.
[0173] The temperature was brought to 10° C., followed by 4 fl...
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