Micro-channel continuous urea formaldehyde resin production method and device

Abstract

The invention discloses a micro-channel continuous urea formaldehyde resin production method and device, and belongs to the technical field of urea formaldehyde resin production and aims to solve theproblem that a conventional process is low in production efficiency. The method comprises the following steps: in a primary reaction system, injecting formaldehyde and urea into a buffer tank, adjusting the pH value of the mixed liquid, and feeding into a micro-channel reactor; in a secondary reaction system, feeding the mixed liquid into another buffer tank, adding melamine, feeding the mixed liquid into another micro-channel reactor, and adjusting the pH value of the mixed liquid; in a third reaction system, feeding the mixed liquid into another buffer tank, putting polyvinyl alcohol and urea into the buffer tank, testing the viscosity of the mixed liquid, feeding the mixed liquid of which the viscosity is qualified into another micro-channel reactor, and adjusting the pH value of the mixed liquid; in a fourth reaction system, feeding the mixed liquid into another buffer tank, putting urea into the buffer tank, feeding the mixed liquid into another micro-channel reactor, and adjusting the pH value of the mixed liquid; performing dehydration and discharge, namely feeding the mixed liquid after four stages of reactions into a vacuum dehydration system, and performing discharging and filling, so as to obtain a micro-channel continuous urea formaldehyde resin. The method and the device can be adopted to product urea formaldehyde resins.

Description

technical field [0001] The invention relates to a microchannel continuous urea-formaldehyde resin production method and device, and belongs to the technical field of urea-formaldehyde resin production. Background technique [0002] The traditional urea-formaldehyde resin production process is a tank reaction, that is, the entire reaction process is completed in a reactor. This is the current common production process of urea-formaldehyde resin. The technology has been formed for nearly 100 years and is still in use. [0003] The traditional urea-formaldehyde resin kettle reaction has the following disadvantages: firstly, the equipment occupies a large area; secondly, the kettle reaction is a periodic reaction, with a large number of single feeds, and the control of the reaction process is relatively difficult. Once the acidity adjustment is out of balance, the reactor will The material will undergo a gel reaction within a few seconds, causing the entire kettle to be wasted,...

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Problems solved by technology

[0003] The traditional urea-formaldehyde resin kettle reaction has the following disadvantages: firstly, the equipment occupies a large area; secondly, the kettle reaction is a periodic reaction, with a large number of single feeds, and the control of the reaction process is relatively difficult. Once the acidity adjustment is out of balance, the reactor will The material will undergo a gel reaction within a few seconds, causing the entire kettle to be wasted, or poor temperature control will cause the material in the kettle to boil violently. In this case, not only will a large amount of harmful steam be generated, but in severe cases, the material in the kettle will overflow and hurt people

Third, due to the large amount of single feeding in the tank reaction, it takes a long time to stir the raw materials to be uniform after they are put in. At the same time, because the reaction process requires multiple pH adjustments and the injection of various additives, the injection of these auxiliary materials is also Long-time stirring is required, which seriously restricts the improvement of production speed

Fourth, the heating method of the traditional reactor is basically jacket heating or coil heating, and the heating medium is steam. Since the reactor body is made of cast steel or stainless steel, its thermal conductivity is poor and the heating efficiency is relatively low. low power consumption

Fifth, due to the long mixing time and low mixing efficiency of the reaction kettle, when measuring data such as concentration, pH, solid content, temperature, etc., measurement errors will be caused by insufficient mixing, and in this case it is difficult to install various Sensors for automatic control

Sixth, although the traditional urea-formaldehyde resin production can carry out closed operation of the reactor during the reaction process, the upper cover of the reactor needs to be opened during several processes such as feeding, sampling, observation, and blending. At this time, the operator is almost completely exposed. In harmful gases, it will also cause a lot of pollution around the reactor, causing damage to human health

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