Synthetic method of organosilicon polyurethane-acrylic ester ternary composite ionomer emulsion
An acrylate and ternary composite technology, which is applied in the field of synthesis of silicone-polyurethane-acrylate ternary composite ionomer emulsions, can solve the problems that ionomer emulsions are rarely reported, and achieve enhanced water resistance and performance Stable and good compatibility
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[0025] Example 1
[0026] The following is an example of preparing silicone-polyurethane-acrylate ionomer emulsion according to the present invention, with the following process and steps:
[0027] (1) Synthesis of silicone polyurethane prepolymer
[0028] Mix 90ml of methyl ethyl ketone solvent with 0.1mol of toluene diisocyanate (TDI) and add it to a nitrogen-protected three-necked flask, and add three drops of the catalyst dibutyltin dilaurate (DBT). The temperature is raised to 60℃ and slowly dripped. Add hydroxy-terminated polydimethylsiloxane, and the content of hydroxy-terminated polydimethylsiloxane accounts for 22% of the mass percentage of toluene diisocyanate. The dripping is completed in about 1.5 hours, and the reaction is continued for 1.5 hours after the dripping is completed. Then, polypropylene glycol (PPG1000) was added dropwise, the molar ratio of toluene diisocyanate (TDI) to polypropylene glycol was 1:1, and the dropping was completed in about 1.5 hours. After...
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[0033] Example 2
[0034] The synthesis method of the silicone-polyurethane-acrylate ternary composite ionomer emulsion of this example is basically the same as that of Example 1, except that the mass percentage of cationic silicone polyurethane prepolymer (PU) is shown in Table 1. The influence of different cationic silicone polyurethane prepolymer (PU) mass percentage content on the performance of copolymerized emulsion is listed. It can be seen from the table that as the content of PU increases, the color of the emulsion becomes lighter, and the amount of gel in the copolymerization reaction decreases. The copolymer emulsion is also more stable. Because PU prepolymer contains a large number of ionic bonds and also contains hydrophilic and lipophilic groups, it can play a good emulsification effect on emulsion polymerization. Therefore, the increase in PU content is helpful to the emulsion polymerization reaction, so the synthesized emulsion is more stable and the amount of gel is...
Example Embodiment
[0040] Example 3
[0041] The synthesis method of the silicone-polyurethane-acrylate ternary composite ionomer emulsion of this example is basically the same as that of Example 1, except for the mass percentage of silicone. Table 3 lists the content of silicone The effect of changes on the mechanical properties of the coating film. It can be seen from the table that the mechanical properties of the coating film have been greatly improved. The hardness of the coating film can reach 2H when the silicone content is less than 52%, the adhesion can reach zero, and the impact strength is all qualified. Analyzing the water resistance data of the coating film, it is concluded that the water resistance of the coating film has been greatly improved through the ionic bonding between acrylate and polyurethane. At the same time, with the increase of silicone content, the water resistance of the coating film has also been strengthened.
[0042] Table 4 lists the influence of the change of silic...
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