A kind of organosilicon nanogel for gradient polymerization, its preparation method and application

Abstract

The present invention has synthesized a kind of silicone nano gel for gradient polymerization and its preparation method, comprising the following steps: adding modified silicone oil and acrylic ester monomer into a reaction kettle, adding a chain transfer agent, a free radical initiator and a solvent 1 reaction to obtain product 1; product 1 was settled twice with solvent 2 to remove unreacted monomer to obtain product 2; after product 2 was dissolved in solvent 3, it was distilled under reduced pressure to obtain product 3; product 3 was dissolved in In the solvent 4, add an isocyanate compound and a catalyst to react until the Fourier infrared spectrometer cannot detect the hydroxyl group to obtain the product 4; the product 4 is purified according to the above-mentioned method to obtain the product 5. The beneficial effects of the invention are: (1) the synthesized nanogel can reduce the shrinkage stress in the photopolymerization process; (2) the nanogel has self-floating ability, forms a gradient distribution in the photopolymerization system, and passes through one photopolymerization A polymer with gradient changes in composition and properties can be obtained.

Description

technical field [0001] The invention relates to a preparation method and application of an organic silicon nanogel for gradient polymerization, belonging to the technical field of polymer chemical materials. Background technique [0002] Nanogel (Nanogel) is a polymer gel particle with a size of 1-1000nm and a molecular physical cross-linking or chemical cross-linking structure. This macromolecular chain is limited to a certain area to form a network structure, and its molecular structure is between branched macromolecules and macroscopic network polymers, forming a porous sponge shape, and there is no chemical bonding between gel particles. In addition, studies have shown that when photosensitive nanogels with a particle size of about 10nm of high molecular weight are dispersed and swelled in photosensitive monomers, they can reduce the number of reactive groups in the system without affecting the main physical and mechanical properties of the material. The number effectiv...

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Problems solved by technology

However, these preparation methods generally have the disadvantages of long time-consuming, complicated equipment and processes, and high energy consumption. Therefore, developing a simple, easy-to-operate, highly controllable, energy-saving and environmentally-friendly method for preparing gradient polymers has become a current research hotspot.

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