Raw materials and process of redispersible latex powder
The raw materials for preparing dispersible latex powder mainly include latex, surfactants, stabilizers, etc., among which latex is the key raw material for preparing RDP. The process for preparing dispersible latex powder generally includes the following steps:
1. Emulsion preparation: Add appropriate proportions of latex, surfactants, and stabilizers into the reactor and stir evenly, heat to a certain temperature, and react for a certain time.
2. Drying: Spray dry the emulsion obtained by the reaction in a drying chamber to form latex microspheres.
3. Adding additives: Add the latex microspheres to the reactor after adding additives, stir evenly, and react.
4. Screening: The re-dispersible latex powder obtained by the reaction is screened or graded to obtain latex powders of different particle sizes.
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What are the classifications of redispersible latex powder and what should be paid attention to when selecting latex powder?
When choosing latex powder, you need to pay attention to several parameters and corresponding functions:
1. Glass transition temperature: The lower the glass transition temperature, the better the flexibility and the lower the adhesion, and vice versa
2. Viscosity: In the dry mortar products, in the current formulas I have made, except for the self-leveling cement that has requirements for viscosity, the others don't matter. If it is in the self-leveling system, it is best to choose low-viscosity latex powder
3. Anti-caking agent: The addition of an anti-caking agent will have a great impact on the adhesion, which needs to be concluded through an adhesion test.
4. Mini mum film forming temperature: The lower the mini mum film forming temperature, the better the frost resistance and weather resistance, and vice versa.
5. Chemical composition. The classification of several common latex powders is as follows:
EVA ethylene-vinyl acetate copolymer 9 (also known as ethylene-vinyl acetate copolymer) is made by copolymerization of ethylene (E) and vinyl acetate (VA). The English name is Ethylene VinylAcetate, referred to as EVA or E/VAC.
E/VC/VL terpolymer of ethylene, vinylamine nine, and vinyl laurate
VAC/E/VeoVa terpolymer of vinyl acetate, ethylene, and higher fatty acid Q vinyl ester
VAC/VeoVa terpolymer of vinyl acetate and higher fatty acid vinyl ester
A/S acrylate Q and styrene copolymer
VAC/A/VeoVa terpolymer of vinyl acetate, acrylate, and higher fatty acid vinyl ester
PVAC vinyl acetate homopolymer
SBR styrene and butadiene nine copolymer
It is said that the adhesion and flexibility of acrylate and styrene copolymer are the best, but unfortunately, there are no products on the market. The most commonly used is ethylene-vinyl acetate copolymer, which is widely used. Styrene-butadiene copolymer, ethylene-vinyl acetate copolymer Q versatile vinyl ester is grafted with silicone, vinyl laurate, and other materials to improve performance. Different modification measures make the re-dispersible rubber powder. It has different properties, such as water resistance, alkali resistance, weather resistance, and flexibility. Containing vinyl laurate and silicone Q can make the rubber powder have good hydrophobicity. Highly branched tert-butyl vinyl carbonate "has a low Tq value and good flexibility. These rubber powders are used in mortar and have a delayed effect on the setting time of cement.
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