Method and device for preparing polyurethane water-resistant paint by microwave reaction
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A polyurethane waterproof and microwave reaction technology, which is applied in polyurea/polyurethane coatings, chemical instruments and methods, chemical/physical/physicochemical fixed reactors, etc., can solve high energy consumption, unstable product quality, and long synthesis time and other problems, to achieve the effect of synchronous heating, fast and uniform heating, and avoiding temperature inconsistency
Inactive Publication Date: 2017-08-25
LIAONING JIUDING HONGTAI WATERPROOF TECH CO LTD
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[0003] The technical problem to be solved by the present invention is to provide a polyurethane waterproof coating prepared by microwave reaction with low energy consumption, short reaction time and stable product quality in view of the defects of long synthesis time, high energy consumption and unstable product quality of existing polyurethane waterproof coatings. Method and device for coating
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[0030] The microwave reaction of the present embodiment prepares the method for polyurethane waterproof coating, comprises the following steps:
[0031] In the microwave reactor, add 20 parts of polyether polyol 2000, 12 parts of polyether polyol 3000, and 0.1 part of dispersant through the vacuum feeding device in sequence, turn on the anchor stirring device and microwave heating device, raise the temperature to 60 ° C, and add 30 parts For pigments and fillers, turn on the high-speed shearing device, continue to heat up to 90°C, turn on the vacuum device, continue to heat up to 120°C, extract the condensate from the condenser device at the inlet end of the vacuum device, and use a moisture analyzer to detect the moisture content in the condensate until No moisture is detected, which means that the dehydration is completed, and the vacuum device and microwave heating device are stopped. Turn on the rapid cooling device, lower the temperature of the material to 60°C, feed 9 pa...
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Abstract
The invention provides a method and device for preparing polyurethane water-resistant paint by microwave reaction. The method comprises the following steps: 1, microwave dehydration: charging the raw materials polyether glycol, a pigment, fillers and a dispersant into a microwave reaction kettle provided with a microwave heating device, a condensing reflux device, an anchor-type wall-scraping stirrer, a high-speed shearer, a quick cooling device and a vacuum device, and starting the microwave heating device; 2, cooling: starting the cooling device for reducing the temperature of the materials to 50-70DEG C, charging isocyanate and starting the microwave heating device; 3, cooling: charging a catalyst, a curing agent and a solvent; 4, vacuum defoamation; 5, discharging; and 6, washing of a tank: charging the solvent, starting the condensing reflux device and the heating device, and controlling the temperature. When used for preparing the polyurethane water-resistant paint, the method provided by the invention has the advantages of high heating rate, high cooling rate, short reaction time, stable properties of final products, large production capacity, low cost and the like.
Description
technical field [0001] The invention relates to the preparation technology of polyurethane waterproof coating, in particular to a method and device for preparing polyurethane waterproof coating by microwave reaction. Background technique [0002] Polyurethane waterproof coatings are mainly made by reacting polyether polyols and isocyanates. Key control points include raw material moisture content, reaction temperature, and reaction time. The traditional reactor uses heat transfer oil to flow in the jacket to radiate heating and cooling the material, which has the problems of inaccurate temperature control and long heating and cooling time (the time of heating and cooling often occupies more than 2 / 3 of the production cycle), so How to quickly and accurately heat materials without generating excess heat and cooling down faster has become the key technology for improving quality and reducing energy consumption in the field of polyurethane waterproof coating production. Conte...
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