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Liquid fabric detergents are the most widely used liquid cleaning agents, designed for washing and maintaining cotton, cotton/synthetic blends, and synthetic fabrics. They effectively remove human-derived soils (e.g., sebum), particulate soils (e.g., dust), and greasy stains (e.g., animal/plant oils).

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Core Requirements for General-Purpose Detergents

1. Strong detergency: Efficient removal of diverse stains.

2. Hard water adaptability: Stable performance in high-mineral water.

3. Controlled foaming: Low foam for machine washing to ease rinsing; moderate foam for handwashing.

4. pH optimization:

- Heavy-duty detergents: Mild alkalinity (compliant with standards) to enhance cleaning.

- Delicate fabric detergents: Neutral pH to protect silk, wool, and other natural fibers.

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Key Components of Liquid Detergents

1. Surfactants

- Primary anionic surfactants (1–2 types):

- Sodium alcohol ether sulfate (AES)

- Linear alkylbenzene sulfonate (LAS)

- Sodium alkyl sulfonate (SAS)

- Alpha-olefin sulfonate (AOS)

- Nonionic surfactants (auxiliary/enhancers):

- Fatty alcohol polyoxyethylene ethers (AEO7, AEO9) for penetration.

- Alkyl (6501) or amine oxides for thickening/stabilizing.

- Industry standards: Total surfactant content ≥15% (standard) or ≥25% (concentrated formulations).

2. Builders

- Enzymes: Protease, lipase, cellulase (enhance stain removal).

- Anti-redeposition agents: Polyacrylate sodium, polyvinylpyrrolidone (PVP).

3. pH Regulators

- Alkaline: NaOH, KOH, triethanolamine, sodium silicate.

- Acidic: Citric acid, sodium citrate, sodium succinate.

4. Chelating Agents

- Sodium citrate, polyacrylate, or polyacrylic acid/maleic anhydride copolymer salts (soften water, prevent mineral buildup).

5. Functional Additives

- Anti-redeposition agents: Polyacrylate sodium.

- Color-protection agents: Anti-dye-transfer polymers.

- Antimicrobials: Plant extracts (e.g., tea tree oil).

- Softening agents: Quaternary ammonium compounds (optional).

6. Viscosity Modifiers

- Thickeners: NaCl (primary), sulfates (e.g., Na₂SO₄).

- Solvents/co-solvents: Ethanol, propylene glycol, urea (enhance solubility).

7. Foam Control

- Silicone-based: High efficiency but may reduce transparency.

- Polyether-based: Suitable for clear formulations (activated above cloud point).

- Mineral oil: Cost-effective.

8. Preservatives

- Isothiazolinones (e.g., Kathon CG), bronopol.

9. Aesthetics

- Fragrances, dyes (ensure visual appeal and long-lasting scent).

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Industry Trends

1. Concentrated formulations: Higher surfactant/enzyme content (≥25%) for reduced packaging and transportation costs.

2. Low-temperature/water-saving: Energy-efficient performance in cold water.

3. Eco-friendly & biodegradable: Shift toward plant-derived surfactants (e.g., APG) and phosphate-free builders.

4. Multifunctionality:

- Antibacterial/antiviral properties.

- Color protection, anti-pilling, fabric softening.

- Extended fragrance retention (microencapsulated scents).

5. Transparency/stability: Improved compatibility of additives (e.g., enzymes, silicones) in clear formulations.

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Note: Formulations must balance performance, safety, and regulatory compliance (e.g., pH limits, biodegradability). Innovations focus on sustainability, user customization, and enhanced fabric care.