| abstract |
The invention discloses the preparation of a antifoaming agent compound, which belongs to the technical field of fine chemical industry formulation, and is characterized in that the antifoaming agent compound consists of following components: 10 to 90 portions of polysiloxane with the general structural formula of RaSiO(4-a)/2 and 10 to 90 portions of polysiloxane with the general structural formula of R<2>b(R<1>O)cSiO(4-b-c)/2 and the total amount of the two is 100 portions; 0.1 to 20 portions of fine padding particles, 1 to 20 portions of organic silicon resin, 1 to 10 portions of hydrophobic processing agent, and 0.1 to 10 portions of alkalic catalyst. The preparation of the antifoaming agent compound comprises following steps: (1) the two types of polysiloxane and the organic silicon resin are mixed, temperature is raised, and the alkalic catalyst is added at the temperature of 40 to 140 DEG C for generating polyreaction; (2) the fine padding particles are added into and evenly mixed with the mixture that achieves certain viscosity, the hydrophobic processing agent is added for reaction for 1 to 7 hours at the temperature of 60 to 140 DEG C, and the temperature is further raised to 160 to 230 DEG C for the further reaction lasting for 1 to 4 hours; (3) after the reaction ends, the mixture is preserved for 0.1 to 1.5 hours at the vacuum degree of minus 0.01 to minus 0.08MPa; and (4) the mixture is cooled until room temperature, thus obtaining a white active material that is the antifoaming agent compound. |