Method for preparing styrene-butadiene latex with low film formation temperature

Abstract

The invention discloses a method for preparing styrene-butadiene latex with a low film formation temperature. The method is characterized by comprising the following steps: preparing an aqueous phasesolution for later use; preparing an oil phase solution for later use; preparing an initiator for later use; preparing a base material solution for later use; preparing the styrene-butadiene latex; S6, carrying out aftertreatment. In the process of preparing the oil phase solution, the oil phase solution is prepared by adding materials for multiple times and stirring, the materials are independently and continuously fed into a reaction kettle to participate in a reaction every time, and the weight percent, which the sum of the weights of butadiene and styrene in the material added every time accounts for, in the weight of the material added every time is the same as the weight percent, which the sum of the weights of all butadiene and styrene accounts for, in the overall weight of the oilphase solution; furthermore, the weight of the butadiene in the materials added for a plurality of times is progressively increased or decreased. The method has the effects of reducing the film formation temperature, reducing the cracks generated during film formation of the finished product, and improving the quality of the styrene-butadiene latex finished product.

Description

technical field [0001] The invention relates to the technical field of styrene-butadiene latex production, more specifically, it relates to a preparation method of styrene-butadiene latex with low film-forming temperature. Background technique [0002] In the production of styrene-butadiene latex, the glass transition temperature is a very important indicator. It refers to the temperature at which the high polymer changes from a high elastic state to a glass state, and refers to the temperature at which an amorphous polymer changes from a glass state to a high elastic state or from a later state. The transition temperature from the former to the former is the lowest temperature at which the macromolecular chain segments of the amorphous polymer move freely, usually expressed by Tg. When the film is formed above this temperature, the polymer exhibits elasticity; when the film is formed below this temperature, the polymer exhibits brittleness, so the glass transition temperatu...

AI Technical Summary

Problems solved by technology

When the film-forming temperature is high, the requirements for the ambient temperature become higher, and it is necessary to provide a higher ambient temperature to make the film form, but it often causes cracking after the film is formed, which affects the performance and appearance of the finished product; at the same time, the temperature in winter If the film-forming temperature is not reached, the film-forming time of styrene-butadiene latex will be delayed for a long time, prolonging the production time and increasing the cost. Therefore, lowering the film-forming temperature is an effective way to reduce production costs and improve production efficiency

[0004] The biggest factor affecting the film-forming temperature is the glass transition temperature, but the film-forming temperature is also affected by the progress of the internal reaction and the external environment. For the reaction in a one-time kettle, after the components and contents participating in the reaction are determined, the The glass transition temperature of the generated styrene-butadiene latex has been fixed. If you want to change or reduce the film-forming temperature of the generated styrene-butadiene latex, you can only change it from other aspects

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