Regulator for emulsion polymerization and preparation method thereof

Abstract

The invention provides a regulator for emulsion polymerization and a preparation method thereof. The preparation method comprises the following steps: mixing hydrogen peroxide, an electrolyte, a co-stabilizer and an improver to form a hydrogen peroxide-based modified solution; mixing and reacting with a soluble sodium salt solution, and drying to obtain regulator powder; and mixing and coating molten straight-chain saturated fatty acid and the regulator powder to obtain microcapsule type regulator particles with a core-shell structure. The preparation method comprises the following steps: firstly, preparing sodium salt-based regulator powder with high specific gravity and small particle size; coating with straight-chain saturated fatty acid; forming microcapsules, the dispersion in an emulsion polymerization system is more uniform; reacting under the alkaline and heating conditions of a polymerization system for forming tallate and performing a reemulsification function in a polymerization systme; the released sodium salt is decomposed to form free radicals, a secondary initiation effect is achieved, the micelle concentration of the polymerization system is adjusted after the electrolyte is released, a certain viscosity reduction effect is achieved in the later period of polymerization, and the polymerization efficiency and the product quality are improved through the synergistic cooperation of the multiple effects.

Description

technical field [0001] The invention relates to the technical field of emulsion polymerization, in particular to a regulator for emulsion polymerization and a preparation method thereof. Background technique [0002] Emulsion polymerization is to disperse the monomer in water to form an emulsion with the aid of an emulsifier and mechanical stirring, and then initiate the polymerization of the monomer under the action of an initiator. The system is usually mainly composed of monomer, water, emulsifier and initiator. This polymerization method is the main method of latex synthesis. Wherein, the high-temperature emulsion polymerization refers to the polymerization whose polymerization temperature is above 40°C. [0003] At present, due to the reduction of emulsification efficiency in the late stage of high-temperature emulsion polymerization, a series of problems such as increased system viscosity and reduced conversion rate will occur, which seriously affect the polymerizatio...

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Problems solved by technology

[0003] At present, due to the reduction of emulsification efficiency in the late stage of high-temperature emulsion polymerization, a series of problems such as increased viscosity of the system and reduced conversion rate will occur, which seriously affect the polymerization efficiency and product quality.

Aiming at this problem, the method usually adopted in the prior art is to add an emulsifier, an initiator or a viscosity reducer during the polymerization process. However, there are still certain problems in the above-mentioned method: adding a single additive separately can only act on one side. To a certain effect, and can only have a single effect within a certain period of time, as the reaction progresses, other problems will appear at subsequent time points, such as adding an initiator in the middle of the reaction, there will be a certain rate increase at this stage, but with the As the reaction proceeds, the progress of the polymerization reaction will be hindered due to the increase in viscosity, so it is necessary to reduce the viscosity of the system, and the viscosity reduction will lead to the decline of the emulsified system.

Therefore, the above method cannot better solve the above problems.

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