1、灰钙粉反碱引起泛黄

1. Yellowing caused by alkali reaction of lime and calcium powder

灰钙粉主要成分氢氧化钙，分子式Ga(OH)2，相对分子量74，熔点5220，PH值≥12，逞强碱性，白色细腻粉末状，微溶于水，能溶于酸、甘油、糖、氯化铵中，溶于酸中释放大量热量，相对密度为2.24，其澄清水溶液为无色无嗅的碱性透明液体，置于空气中逐渐吸收，氧化钙变成碳酸钙。

The main component of gray calcium powder is calcium hydroxide, molecular formula Ga (OH) 2, relative molecular weight 74, melting point 5220, PH value ≥ 12, extremely alkaline, white and fine powder, slightly soluble in water, soluble in acid, glycerin, sugar, ammonium chloride, soluble in acid, release a lot of heat, relative density 2.24, its clear water solution is colorless and odorless alkaline transparent liquid, which is gradually absorbed in the air, and calcium oxide becomes calcium carbonate.

氢氧化钙属中强碱性，其碱性及腐蚀性要比氢氧化钠弱，氢氧化钙及其水溶液无毒，但对人的皮肤、衣物等有腐蚀性，不能长时间直接与皮肤接触。氢氧化钙在耐水腻子中属活性填料与重质碳酸钙、腻子粉生成硬性膜，由于其碱性较强，碱的含量较大。

Calcium hydroxide is moderately alkaline, and its alkalinity and corrosivity are weaker than sodium hydroxide. Calcium hydroxide and its aqueous solution are non-toxic, but they are corrosive to human skin, clothing, etc., and cannot be in direct contact with skin for a long time. In water-resistant putty, calcium hydroxide is an active filler and forms a hard film with heavy calcium carbonate and putty powder. Because of its strong alkalinity, its alkali content is large.

在施工时，腻子中的部分水分会被墙基层同样强碱性的水泥砂浆底、或砂灰底(石灰、砂、少量水泥)所吸收，随着腻子层逐渐干燥、水分的挥发，基层砂浆和腻子中的碱性物质和一些水解后不稳定物质(如二价铁、三价铁等)会通过腻子的微细孔折出，遇空气后产生化学反应，引起济南腻子粉表面泛黄。

During construction, part of the moisture in the putty will be absorbed by the cement mortar bottom with the same strong alkalinity of the wall base, or the sand-gray bottom (lime, sand, a small amount of cement). With the gradual drying of the putty layer and the volatilization of the moisture, the alkaline substances in the base mortar and putty and some unstable substances after hydrolysis (such as ferrous iron, ferric iron, etc.) will be broken out through the tiny holes of the putty, which will produce chemical reaction after meeting the air, causing the surface of Jinan putty powder to turn yellow.

2、易挥发性有机化学气体。如一氧化碳(CO)、二氧化硫(SO2)、苯、甲苯、二甲苯、甲醛、烟火等。在一些工程案例中，呈出现在刚刮完奶水妮子的房间内使用油漆或生火取暖、甚至是在房间内烧香、多人同时吸烟等情况而引起腻子表面泛黄。

2. Volatile organic chemical gas. Such as carbon monoxide (CO), sulfur dioxide (SO2), benzene, toluene, xylene, formaldehyde, fireworks, etc. In some engineering cases, the putty surface turns yellow due to the use of paint or fire for heating in the room where the putty has just been shaved, or even burning incense in the room, or many people smoking at the same time.

3、气候环境因素的影响。在北方地区，季节交换期，一般在11月份至第二年5月份有过腻子表面泛黄，但只是个别现象。

3. The impact of climate and environmental factors. In the northern region, the putty surface turns yellow from November to May of the next year during the seasonal exchange period, but only a few phenomena.

4、通风干燥状况不好。墙体潮湿，刮完耐水腻子后，在腻子层未全干燥的情况下，长时间紧闭门窗，也容易引起腻子表面泛黄。

4. The ventilation and drying conditions are not good. When the wall is wet and the waterproof putty is scraped, the door and window will be closed for a long time when the putty layer is not completely dry, which is also easy to cause the putty surface to turn yellow.

5、基层问题。老墙底一般都是砂灰墙(石灰、啥子、少量水泥，有的还惨有石膏)，这类墙基层强度低、吸水率高、易粉化，而新墙底是以水泥砂浆为主，但还有不少地区在用石灰、石膏抹墙。基层墙体中的材料大多呈碱性，腻子接触墙体后，一些水分会被墙体吸入，通过水解、氧化后，有部分物质，如碱、铁等，会通过墙体微细孔折出来，遇空气后产生化学反应，引起腻子表面泛黄。

5. Grassroots issues. The bottom of the old wall is generally sand-sand wall (lime, sand, a small amount of cement, and some have gypsum). This kind of wall base has low strength, high water absorption, and is easy to pulverize. The new wall bottom is mainly made of cement mortar, but there are still many areas where lime and gypsum are used to plaster the wall. Most of the materials in the base wall are alkaline. After the putty contacts the wall, some water will be absorbed by the wall. After hydrolysis and oxidation, some substances, such as alkali and iron, will be broken out through the wall micro-holes, which will produce chemical reaction after meeting the air, causing the putty surface to turn yellow.

除上述可能因素外，还会有其他因素的影响，这需要进一步探讨。当然您对腻子粉有需求，可以随时来我们网站//www.gochiism.com进行咨询了解！

In addition to the above possible factors, there will be other factors, which need further discussion. Of course, if you need putty powder, you can come to our website at any time //www.gochiism.com Consult and understand!