Preparation method of fluorinated hydroxy vinyl tertcarbonate-acrylate copolymer soap-free emulsion with core-shell structure

Abstract

The invention relates to a preparation method of fluorinated hydroxy vinyl tertcarbonate-acrylate copolymer emulsion with a core-shell structure, comprising the following steps: (1) mixing deionized water with 20 percent to 45 percent of reactive emulsifier relative to the total quantity, stirring and dissolving the mixture, then slowly dripping core layer monomer mixing liquid and preemulsifyingto prepare a core preemulsion for standby; (2) mixing deionized water with 20 percent to 45 percent of the reactive emulsifier relative to the total quantity , stirring and dissolving the mixture, then slowly dripping shell layer monomer mixing liquid and preemulsifying to prepare a shell preemulsion for standby; and (3) adding 5 percent to 30 percent of the core preemulsion relative to the totalquantity into a reactor containing 10 percent to 60 percent of the reactive emulsifier relative to the total quantity, a pH buffering agent and deionized water and dispersing; and then adding 10 percent to 30 percent of an initiating agent relative to the total quantity to prepare seeds; after the emulsion turns blue and no obvious back flow is caused in the reactor, dripping the residual core preemulsion and 35 percent to 45 percent of the initiating agent relative to the total quantity; and then dripping the shell layer monomer preemulsion and 35 percent to 45 percent of the residual initiating agent relative to the total quantity to carry out reaction to obtain the fluorinated hydroxy vinyl tertcarbonate-acrylate copolymer emulsion with the solid content of 40 percent to 50 percent. Theemulsion prepared by the method has the advantages of prominent anti-aging performance and obviously improved resistance to water, alkali and washing.

Description

Technical field: [0001] The invention relates to a preparation method of emulsion. It adopts the method of emulsion polymerization, in the presence of reactive emulsifier, through the semi-continuous drop-in process of pre-emulsification of mixed monomers, and synthesizes a hydroxyl fluorine-containing tert-acrylic soap-free emulsion with a core-shell structure. The emulsion can be widely used in the fields of construction and home decoration, and is a fluoroacrylic emulsion with excellent performance. Background technique: [0002] Since the early 1980s, my country has vigorously developed acrylic resin coatings. After more than 20 years of hard work, acrylic resins and coatings have accounted for a considerable proportion of synthetic resins and coatings in my country, and their output is second only to alkyd resins. Because of its excellent weather resistance, gloss retention, color retention, quick drying, brightness, and corrosion resistance, it is widely used in vario...

AI Technical Summary

Problems solved by technology

However, this type of modification cannot fundamentally solve the properties of acrylic resins such as sticking back, solvent resistance, etc.

Moreover, conventional acrylic emulsions are all synthesized in the presence of emulsifiers. When the emulsion is dried and formed into a film, the emulsifier is difficult to volatilize and remains in the film, while itself has hydrophilic groups, making the polymer latex film water-resistant Decrease in performance, adversely affect the paint film

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