Constant-viscosity dropwise adding device for waterborne polyurethane resin

Abstract

The invention provides a constant-viscosity dropwise adding device for waterborne polyurethane resin. The constant-viscosity dropwise adding device comprises a reaction kettle, an acetone tank and a concentration device, the reaction kettle is connected with the acetone tank through a pipeline A, and a flow valve is mounted on the pipeline A; a heat exchange device A is arranged outside the reaction kettle, a heat exchange device B is arranged outside the acetone tank, and an outlet of the heat exchange device A is connected with an inlet of the heat exchange device B; a gas outlet of the concentration device is connected with an inlet of the steam trap; a gas outlet of the steam trap is connected with an inlet of the acetone tank; a condensing device is mounted on a connecting pipeline between the gas outlet of the steam trap and the acetone tank; and the condensing device is positioned above the acetone tank. The dripping device has the advantages of being reasonable in design, high in practicability and convenient to use.

Description

technical field [0001] The invention relates to the technical field of waterborne polyurethane resin synthesis equipment, in particular to a constant viscosity dropping device for waterborne polyurethane resin. Background technique [0002] Water-based polyurethane resin is a kind of polyurethane. It uses water as the dispersion medium and has the advantages of being environmentally friendly. With the gradual enhancement of people's environmental protection awareness, research on water-based polyurethane resin has gradually increased. The deepening is also gradually improved, so that its application range is gradually expanded. [0003] There are many methods for synthesizing water-based polyurethane resin. Among them, the acetone method is the most commonly used method. In this method, acetone can reduce the viscosity of the polymer in the reactor, so that the polymer has good dispersibility and promotes the smooth progress of the reaction. , improve product quality; the l...

AI Technical Summary

Problems solved by technology

[0004] However, there are still the following problems in the preparation of water-based polyurethane resins by the acetone method: one is that the amount of acetone added is difficult to accurately control, resulting in too much acetone in the reaction solution, which increases the amount of processing in the subsequent treatment; the other is the reaction There will be a certain amount of water in the liquid, and part of the water will enter the recovered acetone along with the evaporation of acetone, which is not conducive to the direct utilization of recovered acetone; the third is that the polymerization process needs to maintain the temperature between 70-90 ° C. When acetone is added to the liquid, although the viscosity problem of the reaction liquid can be solved, the temperature of the acetone will still affect the reaction, which is not conducive to the consistency of product quality

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