Does putty feel heavy when scraping? Such an improvement!

When applying putty, it sometimes feels heavy to the touch. This situation is usually caused by:

Cellulose ether viscosity is too high or used improperly. During summer construction, the use of hydroxypropyl methylcellulose ether with poor high temperature resistance may also cause the putty to lose viscosity, thus affecting the feel.

The powder ratio or fineness is inappropriate. Excessive inorganic gelling materials or too fine fillers can easily lead to knife sticking. In addition, in order to reduce costs, some manufacturers may add no or less additives to improve the feel, such as starch ether, thixotropic lubricant, etc.

To improve the problem of putty feeling heavy when scraping, you can take the following measures:

Reasonably choose the raw material ratio and fineness. The overall raw material fineness should be controlled at 150-200 mesh, and the filler fineness is generally 325 mesh. The dosage of powdered polyvinyl alcohol shall not exceed 6%. At the same time, the amount of inorganic cementitious materials should be reduced, and the cement should be controlled between 28% and 32%. Make reasonable use of the properties of additives, such as starch ether, thixotropic lubricants, etc.

Choose the appropriate cellulose ether. It is generally recommended to use hydroxyethyl methylcellulose ether with better performance, better high temperature resistance, adaptable to summer construction, and reduce winter and summer exchange costs. The key is to choose cellulose ether with appropriate viscosity. Generally, putty powder can use cellulose ether with a viscosity of 80,000-100,000, but the addition amount needs to be determined through experiments.

Add additives to improve feel. Consider adding starch ether or thixotropic lubricant (bentonite) to improve the feel of the mortar.

In short, scientific formula combination is the key to solving the problem of heavy putty feel when scraping.