Preparation method for small grainsize polybutadiene latex

Abstract

The invention relates to a preparation method of ABS polybutadiene rubber latex with small grain diameter, comprising components based on a proportioning rate by weight: butadiene 34.00-45.00 percent, secondary monomer 0.01-6.0 percent, thiol 0.12-0.22 percent, emulsion 0.80-2.60 percent, electrolyte 0.12-0.32 percent and desalted water, wherein, the emulsion is made by mixing potassium rosinate and potassium oleate; the electrolyte comprises sodium pyrophosphate or EDTA and potassium carbonate. The emulsion is added in two steps, the temperature is controlled based on a saddle-shaped temperature controlling curve with 63-69 DEG C at prophase, 60-64 DEG C at metaphase and 70-75 DEG C at anaphase, the reaction time is 7-9 hours under 0.8 MPa, or reaction speed at the prophase is accelerated to discharge more heat, then the reaction temperature is decrease when the conversion rate is at 40 percent-80 percent, the heat discharging speed at the metaphase is decreased, then the reaction temperature is raised to a highest point when the conversion rate is more than 80 percent, so as to change a violent heat discharging situation and realize in shortening the reaction time. Quadric adding of the emulsion is used, so as to realize the effects of concentration increasing and reaction pressure decreasing to stably control the polymerization of the polybutadiene, thereby reducing rubber evolution and adhesion of the rubber latex and the conversion rate is more than 97 percent.

Description

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AI Technical Summary

Benefits of technology

This patented technology describes methods used to prepare tiny particles (PB), called pebbles or bubbles). These fine particles have unique properties such as being able to stick together easily without sticking them into each other's hands like candy balls. They also allow for efficient cool down on their owners due to its ability to absorb excessive amounts of moisture quickly while still maintaining an even distribution throughout the entire volume they formulate. Overall, these technical features improve the performance and efficiency of producing minute sizes of Pb(II)-based materials.

Problems solved by technology

This patented technical problem addressed in this patents relating to improving the quality and consistency of synthetic rubber (SR), specifically high molecular weight type BS). Current processes involve either suspension or solution casting followed by aggregation, which results in variations in particle sizes among particles resulting in poor reproducibility across lots. Chemically modified starch may provide better uniformity and controllability compared to other types of chemistry. Additionally, current methods require longer periods of reaction while still producing good quality rubber without excessive thermal energy input.

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