The biggest source of doubts raised by customers is the discoloration of the finished polycarboxylate superplasticizer admixture.

Sometimes, the polycarboxylate superplasticizer admixture manufacturers send clear and transparent products to customers, and sometimes the products sent are red, and the appearance is extremely unstable. The main reason for this phenomenon is that the transport vehicles of admixture manufacturers are iron cans. The use of stainless steel as a transport tank is an act of a local tyrant. Polycarboxylate superplasticizer This product has a neutral pH, but it will react with iron. The iron atoms are oxidized to ferric iron which dissolves into the solution and dyes the liquid red. This reaction is not violent. If the admixture is loaded and unloaded on the same day, the color of the admixture will not change much. If there is admixture residue in the next day or in the jar, the admixture will inevitably be stained red. Generally, thick iron cans will not leak after three to five years, and have no effect on product performance, so most admixture manufacturers still use iron cans for transportation.

Similarly, the discoloration of the finished polycarboxylate superplasticizer admixture due to storage tank problems does not affect product quality.

The finished polycarboxylate superplasticizer admixture not only turns red, but also has the potential of blackening. The blackened admixture is ugly in color and has a foul smell. The reason for this problem is that the residual microorganisms in the sodium gluconate used in the compounding of the admixture continue to ferment at high temperature and cause the deterioration of organic matter. This blackening has nothing to do with the polycarboxylate mother liquor, all sodium gluconate is consumed. Generally speaking, it does not affect product performance, and customers with a short turnover period have already used up the product before it is fermented. Fermentation will occur after ten days of open air storage in summer. The solution is to add a certain preservative to the admixture.

Let's talk about the reddening of the mother liquor. If the reddening phenomenon is caused by improper dosage of reducing agent, it can be improved by adjusting the dosage of oxidizing agent and reducing agent. If it is the reddening phenomenon caused by contact with iron, the solution is. . . Do not touch iron. What if it is really unavoidable to avoid contact with iron? The following is a comparative experiment I did. Divide the mother liquor into two parts, one part of the mother liquor is placed in a plastic container, and one part of the mother liquor soaks a piece of iron.

After the mother liquor turns red, let's make a clean pulp comparison.

Name: Polycarboxylate superplasticizer mother liquor

Name: Dyed polycarboxylate superplasticizer mother liquor

Cement added: **

Cement added:**

Dosage: 0.3%

Dosage: 0.3%

Initial mm: 230

Initial mm: 215

Remarks: The mother liquid of polycarboxylate superplasticizer used in the experiment is the mass percentage of cement, the amount of cement is 300g, and the amount of water: 87g;

The conclusion of the test still tends to be that the contact of the mother liquor with the iron material does not affect the product quality.

During the process of soaking the iron block, I discovered a wonderful thing. After three days of immersion in the mother liquor, the surface was as smooth as ever. Polycarboxylate superplasticizer also has the effect of rust removal.

To sum up, the content of this article is simple, and it can be regarded as a small problem that is often encountered in daily life. If you think of it, just verify it. In the future, if customers have questions in this regard, they can be answered with reason and evidence. From a purely theoretical standpoint, the polycarboxylate admixture should completely insulate any tool from the iron. But in actual production, iron products are the most cost-effective tools and containers. Therefore, iron tools are also used in places where the performance impact is not particularly serious.