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.

由以上可以看出灰钙基耐水腻子，质量好坏就是灰钙质量一定好，氢氧化钙含量达到要求，氧化钙含量越低越稳定，腻子不反粘反稠变硬沉淀，不开裂脱粉。氧化钙含量高会直接影响纤维素保水直接影响纤维素的添加量，使做出来的腻子粉反稠，灰钙中氧化钙含量高说明生产灰钙时生石灰没有熟透，其他重金属离子含量越低越好，避免收光时表面发黑。

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.

其次重钙粉（双飞粉），碳酸钙含量80%以上，其他伴生矿粉和杂质少，白度达到90%以上和细度325目以上，含有铝离子和其他活性矿物，甚至重钙厂往里面有生石灰，容易和纤维素产生凝聚，使纤维素保水失效，腻子膏体变稠变硬，表面粗糙，没有细腻光滑油亮的感觉。

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.

其次如果纤维素质量不好也会导致腻子粉反稠假凝，纤维素引起的腻子粉假凝反稠是因为纤维素中的一些成分发生反应所导致，和阳光直射，温度没有关系，并不是说用有问题的纤维素做出的腻子粉放在阳光下就反稠放在阴凉处就不会反稠，而是只要加水调成膏状后过段时间就会变稠假凝。请记清只是变稠假凝，如果腻子膏体变得又干又涩没有多数是生产灰钙时灰钙没有熟透所致，偶尔也和重钙中的杂质有关。

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.