At present, the widely used redispersible latex powders in the world include vinyl acetate and ethylene copolymer powder, ethylene, vinyl chloride and vinyl laurate ternary copolymer powder, vinyl acetate, ethylene and higher fatty acid vinyl ester ternary copolymer powder. Powder, these three redispersible polymer powders dominate the entire market, especially vinyl acetate and ethylene copolymer powder VAC/E, which occupies a leading position in the global field and represents the technical characteristics of redispersible polymer powder . Still the best technical solution in terms of technical experience with polymers applied to mortar modification:
1. It is one of the most used polymers in the world;
2. The application experience in the field of construction is the most;
3. It can meet the rheological properties required by the mortar (that is, the required constructability);
4. The polymer resin with other monomers has the characteristics of low organic volatile matter (VOC) and low irritating gas;
5. It has the characteristics of excellent UV resistance, good heat resistance and long-term stability;
6. High resistance to saponification;
7. It has the widest glass transition temperature range (Tg);
8. It has relatively excellent comprehensive bonding, flexibility and mechanical properties;
9. Have the longest experience in chemical production of how to produce stable quality products and experience in maintaining storage stability;
10. It is very easy to combine with the protective colloid (polyvinyl alcohol) with high performance.
The detection method of the bonding strength of redispersible latex powder is characterized in that the determination method is as follows:
1. First, take 5g of redispersible latex powder and put it into a glass measuring cup, add 10g of pure water and stir for 2 minutes to make it evenly mixed;
2. Then let the mixed measuring cup stand for 3 minutes, then stir again for 2 minutes;
3. Then apply all the solution in the measuring cup on a clean glass plate placed horizontally;
4. Put the glass plate into the DW100 low temperature environment simulation test chamber;
5. Finally, place it under the environmental simulation condition of 0°C for 1 hour, take out the glass plate, test the film forming rate, and calculate the standard bonding strength of the redispersible latex powder in use according to the film forming rate.