How to prevent gray calcium-based putty powder from grinding and peeling and delamination at low temperature


Release time:

2022-01-12

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How to prevent gray calcium-based putty powder from grinding and peeling and delamination at low temperature

The putty with gray calcium powder as inorganic cementitious material, because of its high whiteness, putty can produce mirror effect, to meet the people's demand for wall decoration more beautiful. However, due to the strong rigidity and low flexibility of gray calcium-based putty, resulting in poor self-cracking resistance, the general batch scraping on the surface of gypsum-based to improve the aesthetic effect, but also because of its delicate material, so it is widely used in surface putty materials.
Grey calcium-based putty has poor water retention and is easy to peel under repeated pressure. Poor water resistance, water easy to collapse, blistering, long-term encounter with water, moisture easy to loose, powder, so that the wall mold.
Grey calcium-based putty is suitable for dry or dry environment, rainy and humid weather is not good for polishing operations.
Gray calcium-based putty with strong alkaline, skin contact is easy to cause skin erythema, allergic itching, grinding powder will damage the eyes.
Grey calcium based putty has strong bonding ability, and the strength of putty is improved instantly, but the bonding strength will decrease with the passage of time, and the strength will also decrease.



How to prevent low temperature gray calcium-based putty powder grinding broken skin delamination?
1. The fineness of heavy calcium should be reasonable. Appropriate fineness, can ensure the fine sanding of sandpaper marks.
2, to reduce the surface hardness of putty. When using the summer formula in winter, the putty surface is exposed to carbon dioxide in the air for a long time under humid conditions, and the film hardness is much higher than the hardness in summer. However, inside the putty coating, because the temperature is low and the drying is too slow, the hardness is often lower than that produced by the same formula gelling in summer. If the outside is too hard and the inside is too soft, the phenomenon of polishing and delamination occurs. To solve this problem, it is necessary to reduce the surface hardness of putty, from the reduction of ash calcium powder in humid conditions in the air hardening film time.
First: let the bottom layer dry and then batch the next layer, and do not give the surface layer putty too much chance to react with carbon dioxide under humid conditions.
Second: adjust the formula to prevent the surface of the putty from generating "water light" (I. e. excessive film hardening). After generating "water light", the surface hardness of the putty is too high and at the same time prevents the carbon dioxide in the air from penetrating into the interior, resulting in too low internal strength and cannot withstand polishing.
3, to improve the putty cohesive strength, internal wear resistance.
First: by optimizing the formula to prevent the putty surface to generate "water light", in order to facilitate the carbon dioxide in the air to the putty layer internal penetration, improve the putty layer internal gel strength, improve the internal wear resistance.
Second: in the formula to add other organic polymer compounds to enhance the internal bond strength and wear resistance.
Grey calcium-based putty is best to be polished within 48 hours.







Key words:

Putty powder