Aluminum hydroxide microcapsule coated with melamine-formaldehyde resin and preparation method of aluminum hydroxide microcapsule

Abstract

The invention discloses an aluminum hydroxide microcapsule coated with melamine-formaldehyde resin and a preparation method of the aluminum hydroxide microcapsule. The aluminum hydroxide microcapsule coated with the melamine-formaldehyde resin is prepared from the following components in parts by mass: 10 parts of aluminum hydroxide, 0.3 part of an emulsifying agent and 5-30 parts of a melamine-formaldehyde resin prepolymer. The preparation method comprises the following steps: firstly, preparing the melamine-formaldehyde resin prepolymer; preparing an aluminum hydroxide water suspension solution containing the emulsifying agent; adding the melamine-formaldehyde resin prepolymer into the aluminum hydroxide water suspension solution containing the emulsifying agent; adjusting the pH to 5-5.5 with a citric acid solution with the mass percent concentration of 10% at a room temperature; raising the temperature to 50-80 DEG C and carrying out heat preservation for 2 hours; standing and filtering; washing an obtained filter cake with de-ionized water for 5 times; and drying at 105 DEG C for 5 hours and grinding to obtain the aluminum hydroxide microcapsule coated with the melamine-formaldehyde resin, which has high flame retardant property and good heat stability.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to aluminum hydroxide microcapsules coated with melamine-formaldehyde resin and a preparation method thereof. Background technique [0002] Aluminum hydroxide is a commonly used raw material for chemical production. One of its most important uses is that it can be used as a flame retardant additive for various polymer materials to improve the flame retardant performance of the material, but it is required that aluminum hydroxide must be at these high It can be dispersed evenly in the molecular substrate, so as not to affect the processing performance and basic mechanical properties of the substrate itself. [0003] Due to the highly polar substance on the surface of aluminum hydroxide, the interface properties between it and the polymer material are too different, and the binding force is very poor. In addition, aluminum hydroxide is prone to agglomeration during the molding process...

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Problems solved by technology

[0009] One of the purposes of the present invention is in order to solve the above-mentioned preparation process of resin-type coated aluminum hydroxide, the coating aluminum hydroxide time of prepolymer caused by the poor description of prepolymer and aluminum hydroxide is long, about 4-12h, the experimental operation steps are comparatively loaded down with trivial details, it is difficult to realize the production of industrialization, further, because the adding of a large amount of additives causes the technical problems such as the poor flame retardancy of the resin-type coated aluminum hydroxide of final gain and provides a kind of using melamine- Formaldehyde resin-coated aluminum hydroxide microcapsules and a preparation method thereof. In the preparation method, the synthesis of the prepolymer melamine-formaldehyde resin itself is about 30 minutes shorter, and the time for melamine-formaldehyde to coat aluminum hydroxide is shorter, only 1 -2h, and the final obtained melamine-formaldehyde resin-coated aluminum hydroxide microcapsules have good thermal stability, flame retardancy, and compatibility with polymers.

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