Preparation method of stable oil-in-water emulsion with high solid content

Abstract

The invention relates to a special emulsification method. According to the method, stirring is stopped in the emulsification process, a mixture of W / O and little water or W / O / W is formed through standing, stirring is started, instantaneous inner shear force in unit area is increased, and formation of the O / W emulsion is facilitated; meanwhile, a hydrophilic emulsifier is dropwise added into the mixture during standing, the formation of the O / W emulsion is facilitated, and full wrapping and dispersing of droplets are facilitated to make the emulsion more stable; in the post-processing stage, the volume of the non-oil phase is increased by adding a stabilizer. By means of the preparation method, the problem that the viscosity of the emulsion with the high solid content is high is solved; meanwhile, the stability of the emulsion with the high solid content is improved, the preparation method is widely suitable for emulsification of hydrocarbons and oxygen-containing derivatives thereof, and the application range is wider.

Description

technical field [0001] The invention relates to a preparation method of a stable oil-in-water emulsion with high solid content. Since the emulsion belongs to fine chemicals, the present invention belongs to the technical field of fine chemicals. Background technique [0002] In recent years, high solids emulsions are being used more and more. In the coating industry, high-solid content emulsion coatings are gradually replacing solvent-based coatings because they do not contain organic solvents, do not pollute the environment, dry and film quickly, and have less gluing times. In the paper industry, high-solid content emulsions can be used as White water defoamer can be used, and can be diluted online according to the degree of foam, which reduces the dosage and cost, and also improves the working efficiency of the paper machine; in the food industry, high-solid content emulsion is more convenient to carry and transport, which is in line with today's fast pace More important...

AI Technical Summary

Problems solved by technology

[0004] For now, the oil phase volume fraction of most high-solid content emulsions is 60-70%. There are many studies on high-solid content emulsions at home and abroad, but most of them are high-solid content polymer emulsions prepared by chemical reactions. , such as emulsion polymerization, polymer dispersion, etc., such as US5124394 introduced the use of polyvinyl oxazoline as a phase transfer stabilizer in the polymerization process, synthesized a high solid content vinyl acetate-ethylene copolymer emulsion with a wide particle size distribution, CN102892830A prepared by first The terpolymer is then modified, and finally emulsified with different concentrations of nonionic surfactants to obtain polyolefins, especially emulsions containing polyisobutylene. However, the process of the two is cumbersome and the operation requires high precision. Therefore, industrialization more difficult

[0005] For high-solid content emulsions prepared by physical emulsification, it is difficult to achieve 65% solid content of the emulsion. Even if it reaches 65%, there are problems such as high viscosity, poor stability, and one-sided process application range.

CN102702755A synergistically prepares a 60-70% high-solid paraffin emulsion by adding amphiphilic nanoparticles, polymer stabilizers and small molecule surfactants, but its method is only for paraffin emulsions, and the scope of application is narrow; CN102600647B uses fatty alcohol The introduction of fatty acid esters into the emulsion and the addition of anionic surfactants after the emulsification process result in a fatty alcohol emulsion with a solid content of 25-40%, but when this process is used to prepare an emulsion with a solid content greater than 60%, oil-water separation will occur problem; US8080586 introduced the preparation of self-emulsified products with a solid content greater than 90% with carbomer, alkyl glycosides, higher fatty alcohols, and partial glycerides of monoglycerides, but the stability was poor, which affected its application value; CN1738603A introduced more Based on the solubilization of polar lipophilic substances by hydroxyl compound matrix and carbohydrate matrix, a transparent emulsion with a solid content greater than 50% can be prepared, but its viscosity is relatively high, and its application range is limited

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