Preparation method of casein-based hollow microsphere polymer film-forming material

Abstract

A preparation method of a casein-based hollow microsphere polymer film-forming material comprises the following steps: casein, triethavolamine and deionized water are mixed and heated to dissolve the casein and then are heated to 70-80 DEG C to obtain a mixed solution, an aqueous solution of caprolactam is dripped into the mixed solution and stirred to obtain a reaction system A, and a mixed monomer A and an aqueous solution of ammonium persulfate are added to the reaction system A to be subjected to thermal reaction at 70-80 DEG C to obtain a seed emulsion; the seed emulsion is heated to 80-85 DEG C, butyl acrylate, methyl methacrylate, methacrylic acid and the aqueous solution of ammonium persulfate are dripped into the seed emulsion and then stirred at 80-85 DEG C to obtain a reaction system B, methyl methacrylate, butyl acrylate and the aqueous solution of ammonium persulfate are respectively dripped into the reaction system B at 80-85 DEG C to be subjected to thermal reaction at 80-85 DEG C, and are cooled to room temperature to obtain a core-shell emulsion; the pH value of the core-shell polymer to 10, and then heating and stirring are performed to obtain the casein-based hollow microsphere polymer film-forming material. The preparation method provided by the invention is safe and environment-friendly. The product can improve the phenomenon that a film formed by a casein coating is hard and brittle, and enhance the moisture permeability and covering performance of a coated substrate.

Description

technical field [0001] The invention relates to a preparation method of a modified casein hollow polymer, in particular to a preparation method of a casein-based hollow microsphere polymer film-forming material. Background technique [0002] Hollow microsphere polymer is a special functional material with a cavity structure. This type of polymer has the characteristics of light weight, large specific surface area, good stability, deformability, sound insulation and heat insulation. At the same time, due to the gap between the polymer and air Higher refractive index difference, thus endowing hollow microsphere polymers with good hiding properties, therefore, such polymers can be used as white plastic pigments for paints and water-based coatings, anti-ultraviolet additives, hand modifiers, low-density additives, insulation It is widely used in coatings, inks, leather, and paper industries as additives for thermal materials and sound-absorbing materials [Zhao Qingmei, Zhou Zhim...

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Problems solved by technology

However, it is inevitable to use macromolecular emulsifiers, swelling agents, etc. during the preparation of such polymers, which reduces the safety and environmental protection in the preparation process[Tingfeng Tan, Shirong Wang, Xianggao Li, et al.Facile preparation and characterization of hollow poly(St-co-MMA-co-BA-co-MAA) core-double shell latex nanoparticles for lectrophoretic displays[J].Current Applied Physic.2009,9:989-992.]

At the same time, due to the high glass transition temperature of this type of polymer emulsion, it is difficult to form a film, so it can only be used in conjunction with the addition of film-forming aids.

In recent years, there have been a small number of domestic reports on the use of such raw materials to prepare film-forming hollow polymer materials. Yuan Caideng et al. used a compound emulsifier to synthesize a film-forming hollow polymer material with a slightly cross-linked intermediate layer by seed emulsion polymerization. Stabilized core-shell emulsion, after treatment with ammonia water, a film-forming hollow polymer with regular structure and good stability at room temperature was prepared. However, alkylphenol polyoxyethylene ether was used as an emulsifier in the process of synthesizing the hollow polymer, which does not meet the current requirements. Green environmental protection theme, at the same time, the degradability of the hollow polymer needs to be further improved [Yuan Caideng, Li Jiangtao, Cao Jianwei, et al. Preparation of self-film-forming hollow particle emulsion at room temperature[J]. Elastomers, 2007, 17(4): 13-18. ]

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