In the water-resistant putty based on gray calcium, the Ca (OH) 2 in gray calcium powder (the mixture of Ca (OH) 2, Cao and a small amount of CaCO3), which is the finished product of lime, reacts with CO2 in air to produce crystalline calcium carbonate. In addition, the solid volume of calcium carbonate is slightly larger than that of calcium hydroxide, which makes the hardened slurry more solid.

由以上可以看出灰鈣基耐水膩子，質(zhì)量好壞就是灰鈣質(zhì)量一定好，氫氧化鈣含量達到要求，氧化鈣含量越低越穩(wěn)定，膩子不反粘反稠變硬沉淀，不開裂脫粉。氧化鈣含量高會直接影響纖維素保水直接影響纖維素的添加量，使做出來的膩子粉反稠，灰鈣中氧化鈣含量高說明生產(chǎn)灰鈣時生石灰沒有熟透，其他重金屬離子含量越低越好，避免收光時表面發(fā)黑。

It can be seen from the above that the quality of gray calcium based water-resistant putty is that the quality of gray calcium must be good, the content of calcium hydroxide meets the requirements, the lower the content of calcium oxide is, the more stable the putty is, the putty will not be anti sticking, anti thickening, hardening, precipitation, cracking and de powdering. The high content of calcium oxide will directly affect the water retention of cellulose, directly affect the amount of cellulose added, so that the putty powder is thickened. The high content of calcium oxide in gray calcium indicates that the quicklime is not fully cooked in the production of gray calcium, and the lower the content of other heavy metal ions is, the better, so as to avoid surface blackening during finishing.

其次重鈣粉（雙飛粉），碳酸鈣含量80%以上，其他伴生礦粉和雜質(zhì)少，白度達到90%以上和細度325目以上，含有鋁離子和其他活性礦物，甚至重鈣廠往里面有生石灰，容易和纖維素產(chǎn)生凝聚，使纖維素保水失效，膩子膏體變稠變硬，表面粗糙，沒有細膩光滑油亮的感覺。

Secondly, the content of calcium carbonate is more than 80%, the other associated mineral powder and impurities are less, the whiteness is more than 90% and the fineness is more than 325 mesh, containing aluminum ions and other active minerals. Even there is quicklime in the plant, which is easy to agglomerate with cellulose, resulting in the water retention failure of fibronectin, thickening and hardening of putty paste, and rough surface, There is no delicate, smooth and shiny feeling.

其次如果纖維素質(zhì)量不好也會導致膩子粉反稠假凝，纖維素引起的膩子粉假凝反稠是因為纖維素中的一些成分發(fā)生反應所導致，和陽光直射，溫度沒有關系，并不是說用有問題的纖維素做出的膩子粉放在陽光下就反稠放在陰涼處就不會反稠，而是只要加水調(diào)成膏狀后過段時間就會變稠假凝。請記清只是變稠假凝，如果膩子膏體變得又干又澀沒有多數(shù)是生產(chǎn)灰鈣時灰鈣沒有熟透所致，偶爾也和重鈣中的雜質(zhì)有關。

Secondly, if the quality of cellulose is not good, it will also lead to the anti thickening and false setting of putty powder. The anti thickening and false setting of putty powder caused by cellulose is caused by the reaction of some components in cellulose, which has nothing to do with direct sunlight and temperature. It does not mean that the putty powder made from problematic cellulose will be anti thickening in the sun and will not be anti thickening in the shade, But as long as the water into paste, after a period of time will become thick false coagulation. Please remember that it is only thickening and false setting. If the putty paste becomes dry and astringent, most of it is due to the incomplete ripening of gray calcium in the production of gray calcium. Occasionally, it is also related to the impurities in heavy calcium.