A kind of regulator for emulsion polymerization and preparation method thereof

Abstract

The invention provides a regulator for emulsion polymerization and a preparation method thereof. The present invention mixes hydrogen peroxide, electrolyte, co-stabilizer and modifier to form a hydrogen peroxide-based modified liquid; then mixes it with a soluble sodium salt solution and dries it to obtain a regulator powder; then utilizes melted linear saturated fatty acid and The conditioner powder is mixed and coated to obtain microcapsule conditioner particles with a core-shell structure. The present invention firstly prepares sodium-based regulator powder with high specific gravity and small particle size, and coats it with straight-chain saturated fatty acid to form microcapsules, which are more uniformly dispersed in the emulsion polymerization system. Under alkaline and heating conditions in the polymerization system, The formation of fatty acid salts plays a re-emulsification role in the polymerization system. At the same time, the released sodium salt decomposes to form free radicals, which plays a secondary initiating role. After the electrolyte is released, the concentration of micelles in the polymerization system is adjusted to play a certain Viscosity-reducing effect, through the synergistic cooperation of the above multiple effects, the polymerization efficiency and product quality are improved.

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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