Insufficient bonding strength of putty may lead to the problem of powder removal. Some manufacturers may excessively reduce the quality and additional amount of adhesive powder to reduce costs, especially for interior putty. The poor bonding strength of adhesive powder and low addition amount will affect the adhesion of putty, which will lead to powder removal. Therefore, the bonding strength of putty is highly related to the quality of glue powder and glue as well as the amount of addition. In addition, the quality of raw materials provided by the supplier may also be a cause of this problem.
In the design of putty formulations, the issues of material selection and structure are critical. For example, for interior non-waterproof putty, the selection of hydroxypropyl methylcellulose (HPMC) as an ingredient, although expensive, does not play a role for fillers such as double-flouring powder, talcum powder, and wollastonite powder. If only HPMC is used it may lead to de-powdering problems. In contrast, the less expensive carboxymethyl cellulose (CMC) and dispersible latex powder (CMS) do not suffer from de-powdering. However, CMC and CMS are not suitable for waterproof putty, nor are they suitable for exterior putty, as they react with gray calcium powder and white cement, which can also lead to delaminating problems. In addition, adding polyacrylamide to gray calcium powder or white cement as a waterproof coating may also cause a chemical reaction leading to delamination.
Uneven mixing is one of the main causes of internal and external wall putty de-powdering. Many manufacturers across the country provide a wide range of putty powder equipment, some equipment is not special mixing equipment, mixing effect is not good, resulting in uneven mixing of putty, which leads to powder problems.
Errors in the production process can lead to putty de-powdering problems. If there is no sweeping function in the mixing mixer and there are more residues, the CMC in the common putty may react with the calcium hydroxide powder in the waterproof putty, and the CMC, CMS in the interior putty and the white cement in the exterior putty may also react and lead to de-powdering. The special equipment of some companies is equipped with a cleaning port, which can effectively remove the residue in the machine, not only ensuring the quality of putty but also realizing the multi-purpose use of one machine to produce many kinds of putty. In addition, Xingmu has also developed the latest generation of formula ingredients, which can be used without cleaning and will not cause reactions.
Weather conditions are also a factor that leads to internal and external wall putty powder. For example, in the dry and well-ventilated areas in the north, the putty finish film-forming speed, is not easy to take off the powder; while in the south, especially in the rainy season humid areas, putty film-forming performance is poor, easy to take off the powder. Therefore, some of these areas choose to adapt to the humid environment plus calcium hydroxide powder waterproof putty. In addition, the origin and quality of raw materials may also affect the quality of putty. For example, the quality of stone powder, calcium carbonate, and quartz powder varies. For these situations, you can contact our company’s engineers to handle and solve the problem one-on-one.
