Daily chemicals are the field where surfactants are closest to daily life, covering detergents, personal care products, and cosmetics. They need to balance "decontamination power" and "safety" (low irritation, environmental protection).
● Core Function: Remove oil stains, sweat stains, and food residues from clothes/tableware.
● Common Surfactant Combinations:
• Main Decontamination: Anionic (LAS, SDS, Sodium Lauryl Ether Sulfate, AES) — AES has strong decontamination power and mildness, replacing traditional SDS to reduce skin irritation;
• Auxiliary Decontamination: Non-ionic (AEO-9, Nonylphenol Polyoxyethylene Ether, NP-10) — Improve low-temperature decontamination power (suitable for cold water washing);
• Mild Conditioning: Amphoteric (CAPB) — Reduce the irritation of anionic surfactants and improve foam stability (e.g., adding 3%-5% CAPB to laundry detergent reduces irritation by 40%).
● Example: Formula of mainstream laundry detergent (10% AES + 5% AEO-9 + 3% CAPB + additives), which balances decontamination, mildness, and low foam for easy rinsing.
● Shampoo:
• Requirements: Clean scalp oil + hair care (smoothness, antistatic).
• Core Formula: AES (cleaning, 8%-12%) + CAPB (mildness, 2%-4%) + Cationic Guar Gum (hair care, 0.5%-1%) — Cationic guar gum adsorbs on the hair surface, filling gaps in hair cuticles to improve smoothness.
● Body Wash:
• Requirements: Mild cleaning + moisturizing.
• Common Surfactants: Potassium Cocoyl Glycinate (amino acid-type, mild, 10%-15%) + CAPB (foaming, 3%-5%) — Amino acid-type surfactants are similar to the sebum structure of the skin, without tightness after cleaning.
● Toothpaste:
• Requirements: Foaming + cleaning dental plaque.
• Common Surfactants: Sodium Dodecyl Sulfate (SDS, 1%-2%) — Stable foaming, assisting abrasives (e.g., calcium carbonate) in removing dental plaque, and no peculiar smell.
● Core Functions: Emulsification (stabilizing oil-water systems), solubilization (dissolving fragrances/preservatives).
● Common Surfactants:
• Emulsifiers: Non-ionic (Span-60/Tween-60 compound, O/W emulsion), Polyglycerol Fatty Acid Ester (W/O cream) — Span is lipophilic and Tween is hydrophilic; a compound ratio of 1:2 can form a stable emulsion (shelf life > 2 years);
• Solubilizers: Polyoxyethylene Castor Oil (EL-40), PEG-40 Hydrogenated Castor Oil — Dissolve oil-soluble fragrances (e.g., rose essential oil) and preservatives (e.g., phenoxyethanol) to avoid stratification.
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