Acrylate-acrylamide copolymer emulsion and preparation method and application thereof

Abstract

The invention discloses an acrylate-acrylamide copolymer emulsion and a preparation method and application thereof, the emulsion is prepared by reverse emulsion polymerization of a polymeric monomer, an emulsifier, a water phase and an oil phase, the total mass of the polymeric monomer and the emulsifier is 100%, the main raw materials and contents are as follows: S1, 25-70 wt% of at least one salified or partially salified vinyl monomer, S2, 10-35 wt% of a vinyl monomer different from the component S1, S3, 10-30 wt% of at least one N-alkyl acrylamide, S4, 0.01-0.15 wt% of at least one crosslinking monomer, S5, 2.5-10 wt% of a water-in-oil emulsifier, and S6, 2.5-10 wt% of an oil-in-water emulsifier. When the emulsion is applied to the concealer, the emulsion can be independently used as an emulsifier and a thickening agent at the same time, and the problem of powder blocking in the smearing process can be solved.

Description

technical field [0001] The invention relates to a copolymer emulsion, in particular to an acrylate-acrylamide copolymer emulsion and its preparation method and application. Background technique [0002] In recent years, with the improvement of people's living standards, people's demand for sunscreen and concealer is gradually increasing. Traditional concealer products, such as concealer cream, need to add thickeners to increase the viscosity of the product to keep the product stable. At the same time, it is also necessary to add emulsifiers to ensure that oil and water can be better mixed and give full play to the advantages of the product. Concealer products have different requirements for thickeners than other products, not only need to provide appropriate viscosity, but also need to be able to stabilize oil, and in most concealer products, often add a variety of oils to produce different effects, such as adding vegetable oil Provide sticky feeling, add silicone oil to pr...

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Problems solved by technology

Concealer products have different requirements for thickeners than other products, not only need to provide appropriate viscosity, but also need to be able to stabilize oil, and in most concealer products, often add a variety of oils to produce different effects, such as adding vegetable oil Provide sticky feeling, add silicone oil to provide a certain spreadability, different types of oil have different requirements for the hydrophilic and lipophilic value (HLB) of the emulsifier, which makes it difficult to use an emulsifier to provide emulsifying performance, It is necessary to add a variety of emulsifiers for compound use, which brings some difficulties to formula design and product production

[0003] Patent US8668915B2 invented an acrylamide polymer emulsion, the polymer adopts the method of inverse emulsion polymerization, using acrylamide and 2-acrylamido-2-methylsulfonate sodium as polymerized monomers to prepare the polymer It can be used as a thickener or emulsifier when used without calculating the HLB value, which greatly facilitates the formula design of the product, but its ion resistance is poor, and the emulsification performance is difficult to meet the requirements. Therefore, it is necessary to use its design When formulating, thickeners with stronger ion resistance, such as xanthan gum, hydroxyethyl cellulose, etc., need to be added, and other emulsifiers need to be added to ensure that the system is stable without delamination or flocculation

[0004] CN200610037080.3 uses inverse emulsion polymerization to prepare acrylamide emulsion. Compared with the aforementioned patents, the initiator, emulsifier, and reaction process used are different, and the ion resistance of the obtained polymer emulsion is improved, but the low viscosity The thickening performance has declined, and the salt resistance performance still cannot meet the requirements of being used alone in the cream system

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