Update:
Interpenetrating polymer is a kind of high-quality special polymer. At least one of its composition is a cross-linked s...
Interpenetrating polymer is a kind of high-quality special polymer. At least one of its composition is a cross-linked structure. It achieves the effects of "forced mutual solubility" and "molecular synergy" at the molecular level. The capacity is better.
Add polyether glycol isocyanate, chain extender, and catalyst in a suitable solvent system for gradual addition polymerization, while adding acrylate monomer and oil-soluble initiator for free radical polymerization. Choose appropriate reaction conditions to obtain synchronous IPN. The PUA product obtained by the method is then subjected to the phase transfer method to prepare the PUA emulsion. According to different needs, the reaction steps and monomer types can also be changed to synthesize semi-IPN or partial-IPN PUA products.
The more commonly used difunctional monomers containing unsaturated double bonds and active hydrogen are hydroxy acrylate and unsaturated polyester. The unsaturated double bond of hydroxy acrylate has high reactivity and is easy to graft, but it should be noted that the reaction temperature should not be too high when reacting with isocyanate. Unsaturated polyesters include maleic anhydride unsaturated polyesters and fumaric acid unsaturated polyesters. Compared with hydroxy acrylate, its price is cheaper, but the reactivity of unsaturated double bonds is lower, and the grafting effect is poor.
Acrylic polyurethane is mainly through the respective monomers and prepolymers, after mixing, the polymerization reaction is completed in situ according to the respective chain growth methods, and only a small amount is the grafting reaction between acrylic acid and polyurethane. This process leads to the formation of close entanglement at the molecular level and the formation of subvalent molecular bond forces. Therefore, the grafted IPN composite emulsion formed is actually an interpenetrating network emulsion (LIPN) at the molecular level.
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