Preparation of silicone modified waterborne polyurethane-Iota

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Service > Preparation of silicone modified waterborne polyurethane

Preparation of silicone modified waterborne polyurethane

Silicone modified waterborne polyurethane is also the 2 methods of blending modification and copolymerization.. Can be achieved by blending waterborne polyurethane emulsion and polysiloxane emulsion blend. Polyurethane can improve the polysiloxane emulsion oil resistance and polysiloxane emulsion can improve waterborne polyurethane resistance to water and solvent resistance and blending between the two can obtain the effect of complement. But due to the presence of emulsifiers, blending modification on the final film have a negative impact on the performance, blending modification is just a simple mechanical mixing, no chemical bond formation, silicone oil is easy to migrate, resulting in silicon are in short time. Copolymerization modification is the most commonly used method of aqueous polyurethane modified by organosilicon, through both ends with reactive functional groups of polysiloxane oligomers, such as hydroxyl silicone oil, amino silicone oil, amino or alkoxy terminated silane coupling agent and multi isocyanate by stepwise addition, polymerization of block copolymers.

The preparation method of organic silicone copolymer modified waterborne polyurethane mainly has 2 kinds of methods of synthesis and chain expansion.. The synthetic method is the introduction of hydroxyl or amino silicone oil in the polyurethane chain during the synthesis of the polymerization process.. The reactive activity of hydroxyl silicone oil is moderate, and the reaction of the synthesis is stable, and is better than the amino silicone oil.. The chain expansion method is the introduction of amino silicone oil expansion chain in the process of pre polymer emulsification..

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