Novel preparation and continuous production method of melamine resin

Abstract

The invention discloses a novel preparation and continuous production method of melamine resin. The melamine resin comprises 0-5 parts of water-soluble modified organic silicon, 0-10 parts of fluorinated polyol, 10-50 parts of melamine, 20-50 parts of formaldehyde, 5-30 parts of modifier, 0.1-5 parts of combined phase transfer catalyst, 10-50 parts of desalted water, and 0-20 parts of sodium hydroxide. The preparation and continuous production method includes the steps of firstly, mixing the materials; secondly, quantitatively conveying for feeding the materials; thirdly, heating for polycondensation; and fourthly, cooling and controlling temperature. The melamine resin produced by the preparation and continuous production method is long in shelf life, high in dispersibility, less prone to caking, stable in performance and the like, and is quite applicable to stable production of melamine resin foamed plastic by an industrial microwave and melamine resin fiber by spinning of a screw machine from melamine resin.

Description

technical field [0001] The invention relates to a method for preparing melamine resin, in particular to a method for preparing and continuous production of melamine resin. Background technique [0002] In the past fifty years, the development of melamine resin has continued to deepen, and its application has become more and more extensive. In recent years, the research on melamine resin has shown a phenomenon of flourishing, and new achievements continue to emerge. Several domestic manufacturers have used melamine resin for plastic foaming and fiber production, but water-soluble modified silicone, phase transfer catalyst, The use of fluorinated polyether polyols, the quantitative delivery of resins by gear metering pumps, and the continuous production of heating and polycondensation reactions by heating screw machines have not been reported yet. Some domestic manufacturers of melamine foamed plastics and fibers all use a formula system for the production of melamine resin. ...

AI Technical Summary

Problems solved by technology

In recent years, the research on melamine resin has shown a phenomenon of flourishing, and new achievements continue to emerge. Several domestic manufacturers have used melamine resin for plastic foaming and fiber production, but water-soluble modified silicone, phase transfer catalyst, The use of fluorinated polyether polyols, quantitative delivery of resin by gear metering pumps, and continuous production of heating and polycondensation reactions by heating screw machines have not been reported yet.

Some domestic manufacturers of melamine foamed plastics and fibers all use a formula system for the production of melamine resin. The resin produced by this system has the following obvious disadvantages for foaming and fiber production: improper selection of reaction catalysts, and difficulty in controlling the end point of the reaction Grasp, and the molecular weight of the resin changes greatly, the stability is poor, and it is easy to thicken and agglomerate, so it is not suitable for continuous production of more than 8 hours

The agglomerated and hardened resin is as hard as a stone, which not only affects the production, but also is difficult to remove in the production equipment, which brings a lot of trouble to the cleaning equipment, prolongs the production time, increases the production cost, and shortens the service life of the production equipment. At the same time, the hardened resin cannot be reused, which not only forms waste but also causes environmental pollution

It is impossible to use up the resin in a short period of time when the resin is produced by heating in a reactor, which further makes it difficult to maintain the stability of the resin and increases the difficulty of continuous production

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