Aqueous microencapsulated fireproof paint for ultrathin steel structure
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A technology of microencapsulation and fireproof coatings, applied in the field of coatings, can solve the problems of unsuitability for industrial production, low microencapsulation yield, poor compatibility of aluminum phosphate, etc., and achieves improved compatibility, high practicability, and adhesion. strong effect
Active Publication Date: 2018-10-19
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology
However, aluminum hypophosphite has poor compatibility and high water absorption, especially when added to the paint, it is easy to crack the paint, and it will slowly decompose into corrosive and spontaneously flammable phosphine gas when exposed to the air, and even under extreme conditions. formation of explosive mixtures
Therefore, it is necessary to coat and modify the surface of aluminum hypophosphite during application. For example, a method for preparing microencapsulated aluminum hypophosphite is provided in the patent CN201510410213.6, which uses aluminum hypophosphite as the capsule core and uses melamine / formaldehyde resin, melamine / formaldehyde / polyetheramine copolymer or melamine / formaldehyde / KH550 copolymer as the capsule material, the prepared aluminum hypophosphite microcapsules, the capsule material is difficult to cover the core material, the microencapsulation yield is very low, the cost is high, and it is not suitable Industrial production
Method used
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Embodiment 1
[0062] A water-based microencapsulated ultra-thin steel structure fireproof coating, the components and their mass percentages are: aluminum hypophosphite microcapsules 4%, ammonium polyphosphate microcapsules 35%, pentaerythritol 15%, melamine 12%, water-based benzene Acrylic core-shell emulsion 20%, hydroxyethyl cellulose 0.5%, dispersant 0.5%, defoamer 0.5%, n-octanol 0.5%, water 12%, its preparation method comprises the following steps:
[0063] 1) take the raw material by weighing the mass percentage of each of the above-mentioned components;
[0064] 2) Grind aluminum hypophosphite microcapsules, ammonium polyphosphate microcapsules, pentaerythritol, and melamine into powder, then add water to fully grind and mix evenly; then add hydroxyethyl cellulose, defoamer and dispersant, and continue to fully grind;
[0065] 3) Finally, water-based styrene-acrylic core-shell emulsion and n-octanol are added and thoroughly ground and mixed to obtain the water-based microencapsulate...
Embodiment 2
[0067] A water-based microencapsulated ultra-thin steel structure fireproof coating, the components and their mass percentages are: aluminum hypophosphite microcapsules 6%, ammonium polyphosphate microcapsules 33%, pentaerythritol 15%, melamine 12%, water-based benzene Acrylic core-shell emulsion 20%, hydroxyethyl cellulose 0.5%, dispersant 0.5%, defoamer 0.5%, n-octanol 0.5%, water 12%, and its preparation steps are the same as in Example 1.
Embodiment 3
[0069] A water-based microencapsulated ultra-thin steel structure fireproof coating, the components and their mass percentages are: aluminum hypophosphite microcapsules 8%, ammonium polyphosphate microcapsules 31%, pentaerythritol 15%, melamine 12%, water-based benzene Acrylic core-shell emulsion 20%, hydroxyethyl cellulose 0.5%, dispersant 0.5%, defoamer 0.5%, n-octanol 0.5%, water 12%, and its preparation steps are the same as in Example 1.
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Abstract
The invention discloses an aqueous microencapsulated fireproof paint for an ultrathin steel structure. The fireproof paint is prepared from an aluminum hypophosphite microcapsule, an ammonium polyphosphate microcapsule, pentaerythritol, melamine, hydroxyethyl cellulose, an antifoaming agent, a dispersant, aqueous styrene-acrylic emulsion with a core-shell structure, and water. The aluminum hypophosphite microcapsule is wrapped by modified urea melamine formaldehyde resin, the problems that aluminum hypophosphite is easily decomposed and the coating can be cracked easily are solved; the thermalstability of aluminum hypophosphite is improved, the water absorbing performance is reduced; the efficient synergetic effect between the ammonium polyphosphate microcapsule and the aluminum hypophosphite microcapsule is utilized to greatly improve the fireproof performance of the fireproof paint; the fuming amount of the fireproof paint is largely reduced, the problem that ammonium polyphosphateis easily hydrolyzed, migrated, and precipitated in a damp environment is solved; and the provided fireproof paint has the advantages of efficient fireproof performance, good smoke inhibiting performance, excellent film forming property, excellent waterproof performance, good weatherability, environmental friendliness, and simple preparation, and is suitable for popularization and application.
Description
technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a water-based microencapsulated ultra-thin fireproof coating for steel structures and a preparation method thereof. Background technique [0002] Ultra-thin steel structure fireproof coating is widely used in steel structure fireproof protection because of its thin coating thickness, convenient construction and good decoration. However, the intumescent fire protection system accounts for a very large proportion in ultra-thin fire retardant coatings, especially the acid source ammonium polyphosphate, ammonium polyphosphate, etc. have good water solubility, are easy to migrate when exposed to water, and have poor compatibility, resulting in poor adhesion of the coating. Good, poor durability; at the same time, when the ultra-thin steel structure fireproof coating is expanded and foamed by heat, it will generate a large amount of smoke, endangering people's life, health...
Claims
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Application Information
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