17. The scouring agents and penetrating agents produced by an additive factory are all compounded with nonionic and anionic surfactants. The instructions for use indicate that the alkali resistance of the products is insufficient. How can we improve the alkali resistance of the product?
Answer The alkali resistance requirements of scouring agents and penetrants should generally be determined based on the production process requirements of the printing and dyeing factory. For example, the cotton cloth is removed, boiled and bleached in one bath, some factories adopt the padding and steaming method, and some factories adopt the cold padding method. Due to different production processes, the tissue specifications of cotton cloth are different, and the alkali concentration during pre-treatment is also different; for example, in the conventional cotton rolling and steaming method, the caustic soda concentration of some factories is 20g/L, some factories have a caustic soda concentration of 40-50g/L, and some cold-rolled The caustic soda concentration in the stacking process is 80g/L. Therefore, alkali resistance requirements should be determined according to factory process requirements. As an additive manufacturer, you must first understand the alkali resistance of the raw materials for producing scouring agents and penetrants. Among the commonly used raw materials, such as LAs, AES, SAS, AOS, 601, 6501, AEO9, Among products such as AEO3TX~100, isooctyl phosphate, isooctyl sulfate, alkyl polyoxyethylene phosphate and other products, the alkali resistance varies greatly, such as the alkali resistance of LAS The properties are poor, and turbidity and floc will occur under 60g/L NaOH. If the factory requires an alkali resistance concentration of 80g/L NaOH, LAS cannot be used as a raw material regardless of scouring agent or penetrant. The alkali resistance of 6501, AEO9, SAS, etc. can reach about 100g/L NaOH, while the alkali resistance of 601, AES, K12, etc. is very strong and can reach 200g/L NaOH. There is no floc or precipitation above /L NaOH. Isooctanol phosphates have poor alkali resistance, while isooctyl sulfates have good alkali resistance. Sometimes two surfactants can improve alkali resistance when combined. This requires detailed experiments to confirm.
The judgment of alkali resistance is also very important. According to the GB/T 5556–2003 standard, the degree of alkali resistance is divided into three levels. Level 1 is a completely clear solution. Level 2 means the solution is turbid, without layering and floc. Level 3 means that no matter whether it is clear or turbid, there are floc or oily precipitates. Therefore, some additives are not clear solutions when dissolved in alkaline solutions, but there is no oil precipitation or floc. For example, the scouring agent Cottclarin OK 88 from Henkel Company in Germany cannot be said to be alkali-resistant. Some additives themselves are not clear solutions when soluble in alkali, but can become clear solutions after adding another surfactant. These laws can be confirmed experimentally. According to the above requirements, it is necessary to combine the penetrating power, foaming performance, oxidant resistance, electrolyte resistance, hard water resistance, wool effect, whiteness and other comprehensive effects of the additives to meet the requirements of the printing and dyeing factory.
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