Vae (VAE) emulsion, short for vinyl acetate-ethylene copolymer emulsion, is a polymer emulsion obtained by copolymerization of emulsifier and initiator by high-pressure emulsion polymerization method using vinyl acetate and ethylene monomers as basic materials. Ethylene and vinyl acetate copolymers are the most important products in ethylene copolymers, and are generally referred to as EVA in foreign countries. However, in China, ethylene and vinyl acetate copolymers are classified into EVA resin, EVA rubber and VAE emulsion according to the difference in vinyl acetate content.
Products with a vinyl acetate content of less than 40% are EVA resins; products with a vinyl acetate content of 40% to 70% are very flexible; and have elastic characteristics. EVA resins in this range are sometimes referred to as EVA rubber; vinyl acetate content is 70%. In the range of ~95%, it is usually in the form of an emulsion called a VAE emulsion. The appearance of the VAE emulsion is milky white or yellowish. VAE emulsions are used primarily in adhesives, coatings, cement modifiers and paper processing and have many excellent properties.
VAE emulsion is an environmentally friendly product. Vinyl is embedded in the molecular chain of polyvinyl acetate, which makes the polymer emulsion have a lower film forming temperature and good film forming properties. It has non-stick substances such as PET, PVC, PE, PP, etc. Good adhesion, polymer film has good water resistance, weather resistance, scrub resistance and low temperature flexibility. VAE emulsion viscosity is an important quality indicator, which has a great influence on mass transfer, heat transfer, fluid flow, emulsion stability, and emulsion transport throughout the reaction. In terms of application, the viscosity of the emulsion must be suitable for the requirements of the automated production line, because for the user, if the viscosity of the same brand product changes too much, it will increase the construction difficulty of the user.
For different users, the role of the product and the method of construction are different, and products of various viscosities are required. Therefore, factors affecting the viscosity of VAE emulsion are an important research topic in VAE production and product development. There are many factors affecting the viscosity of the VAE emulsion, such as the solid content of the emulsion, the particle size and particle size distribution of the emulsion, the protective colloid, the amount of the initial initiator added, the solvent, the plasticizer, and the like.
This shows that it is important to control the viscosity. Brookfield viscometers are commonly used in the VAE emulsion manufacturing industry to detect and control product viscosity. Brookfield Viscometers are accurate to ±1% of the measurement range and have a reproducibility of ±0.2%. The Brookfield Viscometer provides precise control of VAE emulsion viscosity and is an indispensable tool for VAE production and product development.
The Brookfield Viscometer is the world's first viscometer, inventing the world's first rotary viscometer, the first to create the world standard for viscosity measurement. With 80 years of production experience, Brookfield's name is synonymous with the best reputation and precision in the field of viscosity measurement and control. Brookfield Viscometer has become the industry benchmark for viscometers with a market share of over 70%. The Brookfield Viscometer is stable, reliable, accurate and repeatable. By measuring with a precise Brookfield viscometer, the VAE emulsion can be precisely controlled to the right viscosity range to maximize the performance of the VAE emulsion.
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