Problems that often occur in putty powder


Release time:

2020-12-16

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putty powder in the frequent problems:

1.1 dry fast. This is mainly the amount of ash calcium powder (too large, can be appropriate to reduce the amount of ash calcium powder in the putty formula) and the water retention rate of the fiber, but also related to the dryness of the wall.

1.2 peel and roll. This is related to the water retention rate, and the low viscosity of cellulose is prone to this situation or the amount of addition is small.

1.3 interior wall putty powder off. This is related to the dosage of gray calcium powder (too little dosage of gray calcium powder in putty formula or too low purity of gray calcium powder, appropriately increase the dosage of gray calcium powder in putty powder formula), and also related to the dosage and quality of cellulose, which is reflected in the water retention rate of the product, low water retention rate, and insufficient time of gray calcium powder (calcium oxide in gray calcium powder is not fully converted to calcium hydroxide for hydration).

1.4 blisters. This is related to the dry humidity and flatness of the wall, and it is also related to the construction.

1.5 needle points appear. This is related to cellulose, which has poor film-forming properties. At the same time, impurities in cellulose and calcium ash have a slight reaction. If the reaction is severe, putty powder will show a state of bean curd residue. Can not be on the wall, at the same time there is no cohesive force, in addition to cellulose mixed with a class of carboxyadyl products also appear this kind of situation.

Volcanic holes and pinholes 1.6 appear. This is clearly related to the water surface tension of the aqueous solution of hydroxypropyl methyl cellulose. The water surface tension of the hydroxyethyl aqueous solution is not obvious. It will be good to receive light treatment.

1.7 putty is easy to crack and yellow after drying. This is related to the addition of gray calcium powder. The addition of gray calcium powder increases the hardness of putty powder after drying. Only hardness without flexibility is easy to crack, especially when subjected to external force. It is also related to the high content of calcium oxide in gray calcium powder, which was introduced earlier.

Key words:

Putty powder