A kind of active hyperbranched siloxane resin and its preparation method and application

Abstract

The invention belongs to the field of chemical synthesis and discloses reactive hyperbranched siloxane resin as well as a preparation method and application thereof. The reactive hyperbranched siloxane resin is mainly prepared according to the following steps: adding a chain transfer catalyst, an initiating agent and a raw material monomer provided with an active group into a reaction vessel, reacting for 0.5-5 hours at the temperature of 50-100 DEG C, and purifying the obtained reaction product, so that the required reactive hyperbranched siloxane resin is obtained. The reactive hyperbranched siloxane resin obtained through chain transfer catalytic reaction has the advantages that structure surface active groups only contain double bond and influence of formation of hydroxyl groups in condensation reaction is avoided; the obtain reactive hyperbranched siloxane resin contains a large amount of double bond active groups which can participate in reaction of solvent-free polyorganic-based siloxane composite and change structure of a crosslinking system, so that a release layer with excellent performance is obtained.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, in particular to an active hyperbranched siloxane resin and its preparation method and application. Background technique [0002] Silicone macromolecules form a network structure by cross-linking on the surface to form an anti-adhesive coating, thereby preventing the adhesive from penetrating into the dense layer. The mechanism of action is that the methyl group can rotate freely on the surface of the substrate, so that it can be arranged in an orderly and dense manner on the surface of the substrate, effectively preventing the adhesive molecules or segments from penetrating into the substrate, and the methyl group itself has very small polarity and a large volume. Small, low surface tension, can form a low surface energy surface after coating, and have a small force on the adhesive, so it has better peeling performance, and can easily peel off highly adhesive substances. The cross-linked netwo...

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Problems solved by technology

However, in the actual production process, there are many problems that are difficult to solve

For example, in the process of silane hydrolysis, silanols will be generated, and the silanols will condense with each other without order, so self-condensation will inevitably occur, and the molecular structure of the obtained resin will be uneven, which will have a great impact on the performance of subsequent products. Big

Therefore, it is necessary to control various factors to balance the molecular structure of the resin. Moreover, the silanol produced during the hydrolysis and condensation process cannot be completely blocked, so that it remains in the finished product, which will have a great impact on the performance of the product.

In addition, during the process of hydrolysis and condensation of MQ, the degree of hydrolysis and condensation will vary greatly with the ratio of M / Q, so the viscosity of the resin obtained in this way is often high or becomes solid, which is not conducive to adding to the system.

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