Epoxy modified silicon resin coating and preparation method thereof

Abstract

The invention discloses an epoxy modified silicon resin coating and a preparation method thereof. The coating is composed of base resin and a cross-linking agent according to the mass ratio of 100: (4-6). The preparation method comprises the following steps of: (1) preparing base resin: sequentially adding a monomer D, a monomer T and a silane coupling agent into a multi-functional stirrer, setting the stirring speed to be 100-300r / min, sequentially adding distilled water and a catalyst while stirring, adding a solvent after a reaction system releases heat, uniformly stirring and mixing, and standing for 12 hours to prepare a resin prepolymer, namely base resin; and (2) preparing the coating: uniformly mixing 100 parts of the base resin prepared in the step (1) and 4-6 parts of a cross-linking agent to obtain the waterborne epoxy modified silicon resin coating. The multi-functional stirrer in the step (1) comprises a damping base, fixed supporting legs, a tank body, a sealing cabin cover, a planetary stirring system, a feeding system and a bubble eliminating device. By means of the planetary stirring system, efficient stirring and accurate feeding of modified epoxy resin are achieved.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to an epoxy modified silicone resin coating and a preparation method thereof. Background technique [0002] Silicone resin is a thermosetting polysiloxane polymer with a highly cross-linked structure. It has the dual characteristics of organic resin and inorganic material. It has unique physical and chemical properties, good electrical insulation properties, temperature resistance and water resistance. However, the pure silicone resin is deficient in mechanical properties, adhesiveness and solvent resistance, and has poor compatibility with other organic polymers, so its performance needs to be improved in application. [0003] Usually, the modification methods of silicone resin include physical blending method and chemical copolymerization method. The physical blending method has the problem of poor compatibility between silicone resin and other organic polymer resins, and it is ...

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Problems solved by technology

Not only that, most of the conventional silicone resin modification methods use chlorosilane monomers as raw materials, which have many shortcomings;

[0005] In addition, when preparing the modified silicone resin coating, a stirrer with a stable stirring effect is required. In the existing stirring technology, most of the ordinary multi-blade paddles are used to stir the resin. Due to the high viscosity of the resin, the ordinary multi-blade paddle The paddle stirring effect is very poor, and the stirring is insufficient; the existing planetary mixer also has problems, for example, when the solid material of the solid catalyst is added, it is difficult for the ordinary planetary mixer to finely disperse the solid material in a short time; at the same time, due to the resin material The viscosity is relatively high. When the material is proportioned, there will be a large amount of boring sticking to the inner wall of the delivery pipe and the constant volume device, resulting in a large error in the proportioning data and affecting the final quality of the product.

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