Boletic acid type polymerisable emulsifier containing negative ion and non-ionic group and preparation method thereof

Abstract

The present invention relates to a fumarate type polymerizable emulsifier containing anion and nonionic groups and a preparation method thereof belonging to the fine chemical field. The structure of the emulsifier is provided with the anion and the nonionic groups, and the synergic action of the two groups can be achieved without remixing. In a concrete proposal, maleic anhydride and fatty alcoholpolyoxyethylene ether are used as starting materials to be processed for three steps of reactions of esterification, acyl chlorination and condensation to prepare for the fumarate type polymerizableemulsifier containing the anion and the nonionic groups. The method is simple and convenient for operating, and a product with good application effect can be obtained without purifying. The product controls the HLB value of synthesized surfactant by adjusting the epoxy ethane adduct number of the fatty alcohol polyoxyethylene ether. The prepared fumarate type polymerizable emulsifier containing the anion and the nonionic groups has good emulsification performance and polymerization stability; in the application of emulsion polymerization, emulsion with good performance can be obtained, and thewater resistance, the alkali resistance and the contamination resistance of dope are all improved obviously.

Description

technical field [0001] The invention relates to a fumaric acid-type polymerizable emulsifier containing anion (containing anion) and nonionic groups and a preparation method thereof, which belongs to the emulsifier in the polymerizable surfactant in the field of fine chemical industry and the preparation method thereof. Background technique [0002] Although the emulsifier is used in a small amount during emulsion polymerization, it plays an important role. It stabilizes the emulsion before and after polymerization, and allows monomers to form latex particles according to the micellar mechanism during polymerization, and affects the polymerization rate, degree of polymerization, number and diameter of latex particles. However, when applied, the emulsifiers present in the latex will cause many negative effects. Because after polymerization, traditional emulsifiers are physically adsorbed on the surface of latex particles, during production and storage, the emulsifier molecul...

AI Technical Summary

Problems solved by technology

Because after polymerization, traditional emulsifiers are physically adsorbed on the surface of latex particles, during production and storage, the emulsifier molecules will desorb, resulting in multiple disadvantages of latex products: (1) the effect of high shear force Under the condition, the physically adsorbed emulsifier will be desorbed from the surface of the latex particles to make the latex liquid unstable and produce a gel; (2) the freeze-thaw stability of the latex liquid is poor; (3) when it is necessary to add pigments, etc. , the emulsifier will compete with the pigment dispersant for adsorption at the two interfaces of latex particles and water, pigment and water, thereby affecting the rheological properties and stability of the latex; (4) in some cases, excessive (5) When the solid product is prepared by the gel method, the emulsifier will remain in the waste water, causing environmental pollution; (6) When it is applied to the film forming of coatings, the emulsifier will migrate, and the residual emulsifier will also cause Film formation rate is slow

However, in order to completely replace and achieve a good emulsifying effect, it is necessary to use more hydrophilic comonomers, which will lead to changes in the composition and properties of the polymer

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