| Abstrakt: |
Polymer agglomeration has a good application prospect in enlarging the particle size of polybutadiene latex (PBL), which has attracted considerable attention in the field of agglomeration. However, the agglomeration process of PBL under different agglomeration conditions has not been studied. In this study, a coaxial cylindrical viscometer was used to perform agglomeration experiments. The different stages of PBL agglomeration can be determined by observing the viscosity changes, because the particle size of nanoparticles in the emulsion is an important factor affecting its viscosity. In this communication, the effects of the content of agglomerating agent, agglomeration temperature, and shear rate on the agglomeration process and particle size of PBL were studied. It was found that with the increase of the content of agglomerating agent, the time required to reach the adsorption saturation and complete the entire agglomeration of PBL decreased. When the content of the agglomerating agent was 4%, the agglomerated PBL showed a bimodal distribution. Then, the mean particle size of agglomerated PBL decreased with the increase of the content of the agglomerating agent. However, when the content of the agglomerating agent exceeded 20%, the mean particle size of agglomerated PBL did not change and remained stable at about 255 nm. Temperature has no obvious effect on the agglomeration process of PBL with 4% agglomerating agent content but can significantly reduce the agglomeration time with 16% and 24% agglomerating agent content. The effect of the shear rate on the agglomeration process of PBL with 4% agglomerating agent content is not obvious. With the increase of the shear rate, the time required for PBL to complete the agglomeration decreased for the systems with 12% and 24% agglomerating agents. In addition, the particle size of agglomerated PBL can be significantly reduced with the increase of shear rate when the content of the agglomerating agent is 12%. This study not only provides a new perspective for the study of the agglomeration process of PBL but also helps to precisely control the agglomeration conditions of PBL and improve the agglomeration efficiency. |
