1. Cellulose ethers (MC, HPMC, HEC)
MC, HPMC, and HEC are commonly used in construction putty, paint, mortar and other products, mainly for water retention and lubrication. it is good.
Inspection and identification method:
Weigh 3 grams of MC or HPMC or HEC, put it into 300 ml of water and stir until it is completely dissolved into a solution, put its aqueous solution in a clean, transparent, empty mineral water bottle, cover and tighten the cap, and put it in Observe the changes of the glue solution in the environment of -38°C. If the aqueous solution is clear and transparent, with high viscosity and good fluidity, it means that the product has a good initial impression. Continue to observe for more than 12 months, and it still remains unchanged, indicating that the product has good stability and can be used with confidence; if the aqueous solution is found to gradually change color, become thinner, become turbid, have a rancid smell, have sediment, expand the bottle, and shrink the bottle body Deformation indicates that the product quality is not good. If it is used in the production of products, it will lead to unstable product quality.
2. CMCI, CMCS
The viscosity of CMCI and CMCS is between 4 and 8000, and they are mainly used in wall leveling and plastering materials such as ordinary interior wall putty and plaster plaster for water retention and lubrication.
Inspection and identification method:
Weigh 3 grams of CMCI or CMCS, put it into 300 ml of water and stir until it is completely dissolved into a solution, put its aqueous solution in a clean, transparent, empty mineral water bottle, cover and tighten the cap, and put it in Observe the change of its aqueous solution in the environment of ℃, if the aqueous solution is transparent, thick, and fluid, it means that the product feels good at the beginning, if the aqueous solution is turbid and has sediment, it means that the product contains ore powder, and the product is adulterated. . Continue to observe for more than 6 months, and it can still remain unchanged, indicating that the product has good stability and can be used with confidence; if it cannot be maintained, it is found that the color will gradually change, the solution will become thinner, become cloudy, there will be sediment, rancid smell, and the bottle will swell , indicating that the product is unstable, if used in the product, it will cause product quality problems
Post time: Feb-07-2023