Can soap and laundry powder neutralization? Take you to understand the similarities and differences in detergent

Many people often doubt when washing clothes. Which effect is good for laundry powder and soap, and will it be better to use together? There is a rumor on the Internet that washing powder is acidic and soap is alkaline. Together, it will cause a neutralized acid -alkali reaction, and the washing effect will be offset. is this real?

On June 26, 2011, in Taizhou, Zhejiang, consumers purchased laundry fluids in a supermarket. (Polices/People’s Pictures)

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The main ingredient of washing powder is sodium dulates, and soap is a mixture of high -grade fatty acid metal salt. The number of carbon atoms is generally 10 ~ 18, and the metal is mainly sodium or potassium.

The pH values ​​of the two are 9 ~ 10, both alkaline, and at the same time, it is obviously not neutralized. However, the laundry powder contains a foaming agent, which is the role of foaming, foaming, penetrating, and anti -hard water. A large amount of foam will be produced in the washing. The foam increases the contact range of the laundry powder and clothing. If the washing powder is used with soap, soap will inhibit the foaming ability of washing powder and reduce the efficiency of cleaning.

At present, how do you choose laundry powder, laundry fluid, soap, soap and other types of detergent. How to choose to use it scientifically? Washing powder is a cost -effective synthetic detergent. It has the advantages of strong decontamination, good dissolution performance, convenient use, anti -hard water, and rich foam. At present, a kind of enzyme is added to the laundry powder, which is an alkaline protease biocuk, which can remove stubborn protein dirt, such as blood stains, milk stains, and grass stains. The washing effect of laundry powder in warm water is better than cold water, and the temperature of water should be at 30 ° C to 60 ° C. With a blisters above 60 ° C, the enzyme will affect the decontamination effect due to losing activity. Washing powder is suitable for cleaning denim, heavy jackets, curtains, etc.

Laundry powder is not suitable for washing hair, silk and other clothes. Because hair, silk and other clothes contain protein, alkaline laundry powder will damage the clothes. If you add enzyme laundry powder, it will destroy the protein fiber structure of hair and silk clothing, which will cause damage to the clothing.

Soap is generated by natural oils through saponification. It has strong pollution, and has good biodegradability. It has non -toxic side effects on the human body and has no pollution to the environment. However, in hard water, the replacement reaction of soap and calcium and magnesium ions will form soap dirt to reduce its decontamination capacity. Moreover, soap dirt is easy to adhere to the clothing and make the washed clothes.


The ingredients of the laundry solution are similar to the laundry powder, the alkali is low, the performance is mild, and the clothing is not damaged. It is suitable for washing underwear, sheets, etc. Its water solubility is good, and it can quickly dissolve in cold water and give full play to its role. Lauxy is often added with low -bubble non -ionic surfactants, so it is easier to rinse. The laundry fluid is generally used for hard water surface active agents, which is effective in soft and hard water. The neutral silk laundry liquid is low -alkaline and can be washed on silk and hair.

The principle of soap powder is the same as soap. Compared with laundry powder, soap powder has a better softest effect, effectively reduce clothing damage. The foam is less foam and easy to drift during laundry. Washing performance. Soap powder is suitable for personal clothes, especially infants and young children’s clothes and diapers.

This article is scientifically controlled by Qi Xiaoyu, an associate professor of the Department of Chemistry and Printing Materials of the Beijing School of Printing.

(Responsible editor: Wang Shaohao, Zhao Liang)