Method for preparing dry high-performance water reducer powder of polycarboxylic acid

Abstract

A method for preparing dry high-performance water reducer powder of polycarboxylic acid comprises atomizing a polycarboxylic acid water reducer solution and allowing it to enter a drying chamber parallel to hot air under the action of a high-pressure pump; and sucking material under a negative pressure of -0.00--0.02 MPa, cooling via cold air with dew point from -23 DEG C to -17 DEG C, separating, collecting and packaging. The pressure of the high-pressure pump is 3-5 MPa, the temperature of the hot air is 180-250 DEG C, the drying chamber is in a shape of cylinder and has a diameter equal to its height, and the inlet temperature of a separator is 25-40 DEG C. The material in a form of spray quickly flies into the drying chamber via a nozzle under the pressure of 3-5 MPa, to thereby overcome the bond force between the material; the cylindrical drying chamber ensures smooth continuous arc connection between wall surfaces; and negative-pressure suction solves the problem of secondary dusting of the dry powder, further prevents the fine material powder from freely flying in the drying chamber and adhering to the walls, and controls the motion direction of the fine dry powder.

Description

technical field [0001] The invention belongs to a preparation method of polycarboxylic acid high-performance water reducer dry powder. Background technique [0002] Chinese Patent No. 2005100290664 discloses a method for preparing a powder polycarboxylate water reducer. In this method, the polycarboxylate water reducer solution is made into a powder water reducer through the spray drying process of a centrifugal atomizer, which makes up for some shortcomings of the existing liquid water reducer in terms of production, use and application range. However, practice has proved that the preparation of powder water reducer by centrifugal atomizer spray drying process has the following problems: this process is only suitable for polycarboxylate water reducer solutions with a solid content of about 20% and a viscosity of 20-40Cp. Drying, but when used for the preparation of polycarboxylate high-performance water reducer dry powder with a solid content of 40%-60% and a viscosity of ...

AI Technical Summary

Problems solved by technology

However, practice has proved that the preparation of powder water reducer by centrifugal atomizer spray drying process has the following problems: this process is only suitable for polycarboxylate water reducer solutions with a solid content of about 20% and a viscosity of 20-40Cp. Drying, but when used for the preparation of polycarboxylate high-performance water reducer dry powder with a solid content of 40%-60% and a viscosity of 70-300CP, the solution is very viscous due to the high solid content and high viscosity of the material, making centrifugal atomization The capacity drops, and the sprayed material becomes fine droplets, which are not suitable for drying, and become semi-dry and adhere to the surrounding walls to accumulate, and the material will burn under high temperature for a long time. Driven by it, it will quickly become a bright combustion. In the light case, the materials will be scrapped, and the equipment will be shut down for cleaning. In the severe case, a fire will endanger the safety of equipment, workshops, personal and property, and there will be serious safety hazards.

Images