Industrial-grade HPMC chemical powder is a key product of Shijiazhuang Cellulose Co., Ltd.Serving as a thickening and water-retention agent for putties, this product ensures excellent application results and is highly favored by customers worldwide.
The reasons why putty powder dries rapidly after being applied to a wall are analyzed as follows:
1. The substrate wall is excessively dry and has a high water absorption rate, causing the putty to lose moisture rapidly.
2. The water retention rate of the Hydroxypropyl Methylcellulose (HPMC) used is poor.
3. The ambient temperature is too high and the humidity is too low, causing the moisture on the surface of the putty itself to evaporate too quickly.
4. Poor curing conditions cause the putty to dry out too fast, preventing it from achieving proper strength development.
5. Rapid drying is primarily related to the dosage of gray calcium and the water retention rate of the fibers; it is also linked to the dryness of the wall structure itself.
Solutions:
If you are a putty manufacturer—and assuming your original formulation has not changed—the issue may stem from the raw materials. Specific formulations require specific analysis; depending on the situation, you may need to increase the dosage of Hydroxypropyl Methylcellulose (HPMC).
1. Poor Quality Putty Powder: To cut costs, some manufacturers use excessive amounts of cement and lime calcium in their putty formulations. When high-alkalinity cement is used in putty, hydration occurs too rapidly, leading to a rapid loss of plasticity and a shortened working time. Lime calcium has a very high water absorption capacity; if added in excessive quantities, it will also cause the putty to dry out very quickly once applied to the wall surface.
Generally speaking, cellulose ether is a key additive in putty powder, and its primary function is water retention. Cellulose ethers of poor quality or low viscosity possess poor water-retention properties, causing the putty to dry out rapidly and become unworkable very quickly.
2. The dryness of the original wall surface and the thickness of the applied coating also influence the drying time of the wall putty. If the wall surface is excessively dry, it will absorb a large amount of moisture from the putty, causing the putty to dry out rapidly immediately after application. In such cases, you must first assess the moisture level of the wall surface; prior to applying the putty, the wall should be sprayed with water. Application should only proceed once the free-standing water has been absorbed or has drained away.
3. Sometimes, high temperatures and intense sunlight accelerate the rate of water evaporation, causing the putty to dry out very quickly after being applied to the wall. This is particularly true during the summer months; construction work should be scheduled to avoid periods of extreme heat and strong sunlight, and should instead be carried out during the cooler hours of the early morning or late evening. Furthermore, the dosage of cellulose ether should be slightly increased to enhance water retention and minimize excessive water evaporation.
