Preparation method of low-temperature-resistant binary fluorine rubber

[0024] Example 1

[0025] at 1m 3 In the polymerization reactor, the air in the reactor is removed by filling with water, and then purged with nitrogen, the lower the oxygen content, the better. Then 450Kg of distilled water, 0.65Kg of potassium persulfate, and 0.15Kg of ammonium perfluorooctanoate are introduced into the reactor, and a monomer mixture composed of VDF, HFP, and PMVE in a molar ratio of 73:24:3 is introduced into the middle tank, and the storage tank is The pressure is 5MPa, normal temperature. A certain amount of monomer mixture is delivered to the reactor through the outlet at the bottom of the storage tank, so that the pressure in the reactor reaches 0.35 MPa. The reaction mixture was heated to 73 °C. The pressure was adjusted to 2.0 MPa by introducing more of the above monomer mixture. After the reaction started, the pressure dropped, and the above-mentioned monomer mixture was periodically introduced to maintain a stable pressure, while maintaining a stir

[0026] Example 2

[0027] at 1m 3 In the polymerization reactor, the air in the reactor is removed by filling with water, and then purged with nitrogen, the lower the oxygen content, the better. Then 450Kg of distilled water, 0.15Kg of potassium persulfate, and 0.10Kg of ammonium perfluorooctanoate are introduced into the reactor, and a monomer mixture composed of VDF, HFP, and PMVE in a molar ratio of 70:24:6 is introduced into the middle tank, and the storage tank is The pressure is 5MPa, normal temperature. A certain amount of monomer mixture is delivered to the reactor through the outlet at the bottom of the storage tank, so that the pressure in the reactor reaches 0.40 MPa. The reaction mixture was heated to 85 °C. The pressure was adjusted to 2.5 MPa by introducing more of the above monomer mixture. After the reaction started, the pressure dropped, and the above-mentioned monomer mixture was periodically introduced to maintain a stable pressure, while maintaining a stir

[0028] Example 3

[0029] at 1m 3In the polymerization reactor, the air in the reactor is removed by filling with water, and then purged with nitrogen, the lower the oxygen content, the better. Then 450Kg distilled water, 0.35Kg ammonium persulfate, 3.3Kg perfluorooctanoic acid are introduced in the reactor, VDF, HFP, PMVE are introduced in the intermediate tank with the monomer mixture formed by the molar ratio of 64:28:8, and the storage tank is made The pressure is 5MPa, normal temperature. A certain amount of monomer mixture is delivered to the reactor through the outlet at the bottom of the storage tank, so that the pressure in the reactor reaches 0.38MPa. The reaction mixture was heated to 78 °C. The pressure was adjusted to 1.5 MPa by introducing more of the above monomer mixture. After the reaction started, the pressure dropped, and the above-mentioned monomer mixture was periodically introduced to maintain a stable pressure, while maintaining a stirring rate of 580r