What role does redispersible rubber powder play in gypsum-based mortar? A: the role of re-dispersible latex powder in wet gypsum slurry: 1 construction performance; 2 flow performance; 3 thixotropy and anti-sag; 4 change cohesion; 5 extend open time; 6 enhance water retention.
The effect of High Flexible Redispersible Powder after gypsum curing: 1 increasing tensile strength (additional adhesive in gypsum system) ; 2 increasing bending strength; 3 decreasing elastic modulus; 4 increasing deformability; 5 increasing material density; 6 to improve wear resistance, 7 to improve cohesion, 8 to reduce the material’s water absorption, 9 to make the material hydrophobic (adding hydrophobic rubber powder) .
What are the common gypsum adhesives?
Answer: cellulose ether water-retaining agent has the function of increasing the adhesion between gypsum and base, such as need to bond gypsum board, gypsum block, gypsum decorative lines in addition to adding cellulose ether water-retaining agent, you also need to add some organic adhesives, dispersible latex powder, polyvinyl alcohol rubber powder, carboxymethyl cellulose (CMC) , modified starch, polyvinyl acetate (white glue) , vinyl acetate-vinyl copolymer emulsion, etc. .
How to choose the adhesive for gypsum?
A: polyvinyl alcohol and carboxymethyl cellulose are less waterproof, but as gypsum is only used indoors as an adhesive, the Redispersible Latex Powder requirements for waterproof and durability are not high, so it’s more economical to use polyvinyl alcohol and carboxymethyl cellulose to increase bonding. The polyvinyl acetate and vinyl acetate-vinyl copolymer emulsion has good adhesion, good water resistance and durability, but the amount of polyvinyl alcohol is larger than that of gypsum, and the price is higher.
Post time: Oct-16-2023