Polyether polyester modified organic siloxane leveling agent

Organic polysiloxane leveling agent belonging to comb like structure. The n+m is approximately 50-250, and the molecular weight is controlled between 1000-150000. Its solubility is adjusted by using polyether and polyester, and the longer the chain length, the higher the solubility. This type of polyether modification is most commonly used, usually using ethylene oxide and propylene oxide. With the increase of ethoxy content, its solubility with water also increases, thus it can completely generate water-soluble siloxane leveling agents. Ethylene oxide and propylene oxide can be used independently or in combination to control hydrophilicity and lipophilicity. If it contains both ethoxy and propoxy groups, it becomes a silicone leveling agent that can be used for both water and oil.

The larger the molecular weight, the stronger the control over the surface condition, and the better the slip and anti adhesion properties.

There are two ways in which modified polyesters or polyethers can be connected to siloxanes: through silicon oxygen bonds; Another type is silicon carbon chain, generally speaking, their heat resistance and wear resistance are not as good as the former.

The compatibility between polyether and polyester modified siloxane and epoxy resin has been greatly improved, reducing interfacial tension, controlling surface flowability, increasing slip, anti shrinkage, and anti adhesion. Some products also have interlayer adhesion problems. Especially in polyether modified polydimethylsiloxane, the heat resistance is not very good and it is very easy to stabilize the foam. When using this product, it is necessary to pay attention to its negative impact.