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How to solve the product stratification of liquid detergent?

In recent years, the production of liquid detergents has developed rapidly. There are many kinds of products on the market, including detergents, shampoos, shower gels, hand soaps, laundry detergents, silk detergents, collar nets, and oil cleaning agents. These products have fast dissolving speed, good dispersibility, easy to use, easy to add functional additives, fast product replacement, adapt to the needs of consumers in today's society, and are therefore welcomed by the masses and are gradually being replaced. Traditional soap and soap detergents.

In the production, the liquid detergent has the advantages of simple production process and process, high temperature and high heat, energy saving, easy control of production quantity, various product types, and easy realization of product variety and multi-functionality. However, compared with solid detergent products, liquid products have poor stability, are susceptible to bacterial contamination in the environment, and are difficult to preserve for a long time. If the key quality control points are not strictly controlled in the production process, product quality is difficult to guarantee. 

Product stratification

  1. The inorganic thickener is added in an excessive amount. Inorganic salts are commonly used in liquid detergents to adjust the viscosity of the product, such as sodium chloride (NaCl). When the amount of the inorganic salt added is too large, the product may be delaminated after being left for a while, which is caused by the precipitation of the inorganic salt which cannot be completely dissolved in the liquid.

  2. When the system contains a nonionic surfactant, when the inorganic salt is added for thickening, the "cloud point" of the nonionic surfactant is lowered to stratify the product. At this time, a small amount of a hydrophilic, highly soluble nonionic surfactant surfactant can be added to solubilize. For example, a substance such as propylamine oxide or a small amount of laurylamine oxide is added. When the concentration of the liquid detergent product is high or the composition is high, in order to improve the compatibility of the respective components and prevent stratification of the product, some solubilizing agents may be selectively added.

3. In the surfactant system, when the amount of dodecylbenzenesulfonic acid (LAS) is too large, the product may delaminate after being left for a while due to solubility. Experience in production practice has shown that in order to control the stratification of liquid products, the proportion of sulfonic acid used in the surfactant system is generally not more than 18%.

4. It is related to the feeding sequence, ratio, temperature and process in the production process. In the production process, we should strictly control the ratio of raw materials, concentration, feeding sequence, feeding method, temperature, production process, etc., so that each batch of products has reproducibility and stability. Dodecylbenzenesulfonic acid and AES are the two most commonly used surfactants in liquid detergents. The following operations should be noted in the production process: (1) the proportion of water added to the reaction LAS, and the sulfonic acid during neutralization. The amount of water is generally controlled at 50% to 60%; (2) the temperature of the reaction LAS, the reaction temperature should not exceed 50 ° C; (3) When dissolving AES, AES should be slowly added to the water to dissolve, not the other way around. If the AES raw material is poured first, then water is added to dissolve AES, the gel material is formed and it is difficult to dissolve; (4) AES is easily decomposed at high temperature, and the temperature should not be too high during operation, generally not exceeding 40 degrees. should. Many people believe that the higher the temperature, the better the AES dissolves, which is not correct; (5) For the formulation containing AES, if the total activator is high (close to 30%), other surfactants and solubilizers should be used first. Dissolve first, then pour into AES to dissolve.

 


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