ASA emulsifying device and control method

Abstract

The invention belongs to the technical field of emulsifying devices, and particularly relates to an ASA emulsifying device and a control method. The emulsifying device comprises a water treatment device, an emulsifying agent pretreating device, emulsifying equipment and a controller, wherein the emulsifying agent pretreating device comprises a first static mixer, a reactor and a second static mixer which are sequentially connected serially; the emulsifying equipment comprises an emulsifying agent pump, a sizing agent pump, an emulsifying pump, an acid pump and a water pump; the emulsifying equipment further comprises a circulating pipeline; the controller is in communication connection with a pH meter, a pressure sensor and a temperature sensor. The control method adopting the ASA emulsifying device comprises the following steps: pretreating water, pretreating an emulsifying agent, treating the emulsifying agent, mixing ASA and the emulsifying agent, performing primarydilution and performing secondary dilution. The ASA emulsifying device is simple in structure, convenient and fast to operate and stable and reliable in technology, and reduces the hydrolysis degree of a sizing agent.

Description

technical field [0001] The invention belongs to the technical field of emulsification devices, and in particular relates to an ASA emulsification device and a control method. Background technique [0002] Sizing makes paper or board liquid-resistant, more suitable for writing or moisture-resistant. The sizing of paper is mainly determined by three sub-processes: the retention of sizing particles on the surface of fibers and fillers; the spreading and redistribution of sizing on the surface of fibers and fillers; the fixation of sizing on the surfaces of fibers and fillers. To have a good sizing effect, it is necessary to ensure that the sizing agent is well spread on the fiber surface. [0003] Alkenyl succinic anhydride (ASA) is a reactive neutral / alkaline sizing agent that is an oily liquid at room temperature and is widely used due to its high activity, low sizing cost, and fast curing rate. However, ASA is insoluble in water, and can be evenly dispersed in the paper ma...

AI Technical Summary

Problems solved by technology

The Venturi system needs to add a large amount of surfactant to ASA, and the surfactant will interfere with the sizing effect of the sizing agent in the paper; the maintenance cost of the regenerative turbo pump is high, and the production cost is high; the multi-stage centrifugal pump occupies a large area, Low service life, not yet widely used

[0005] In the ASA emulsification control method in the prior art, since the ASA structure contains acid anhydride, hydrolysis, alcoholysis, and ammonolysis are extremely prone to occur. Since ASA requires on-site emulsification, the hardness of the water is relatively high, and impurities such as calcium and magnesium ions in the water Existence, ASA is very prone to hydrolysis; when the emulsifier emulsifies ASA to form an ASA emulsion, the emulsifier such as starch needs to be gelatinized and cooled before use, and the surfactant will bring adverse effects on sizing, and the sizing process is complicated and difficult. control

Images