Surfactant Compatibility: Formulating with GLDA and MGDA in Industrial Cleaning

In industrial cleaning applications, Shandong Yuanlian Chemical's GLDA (tetrasodium glutamate diacetate) and MGDA (trisodium methylglycine diacetate) are next-generation green chelating agents. Their core value lies in chelating Ca2+, Mg2+, and metal ions (such as Fe3+ and Cu2+) in hard water, improving cleaning solution stability and decontamination efficiency.

The formulation strategy should focus on three key objectives: enhancing emulsification, penetration, and dispersing capabilities, adapting to various cleaning conditions (e.g., high temperature, strong alkaline), and reducing surface tension.

I. Core Principles for Formulating GLDA/MGDA with Surfactants

1. Functional Complementarity: GLDA/MGDA is responsible for chelating metal ions, and the formulated surfactant should address its shortcomings in emulsifying oil stains, penetrating stubborn stains, and reducing surface tension.

2. Adaptability to Industrial Conditions: Select a surfactant with weather resistance that matches the industrial cleaning temperature, pH (neutral/alkaline/acidic), and contaminant type (mineral oil/animal/vegetable oil/metal oxide).

3. Environmental Compatibility: Prioritize blending surfactants with high biodegradability to align with the environmental attributes of GLDA/MGDA (especially for compliance with EU REACH and China's "Dual Carbon" policy).

II. Anionic Surfactants: The "Workhorse" for Heavy-Duty Degreasing

Anionic surfactants are the primary blended category, suitable for most industrial cleaning scenarios. They possess strong emulsifying and detergency capabilities. Blending with GLDA/MGDA significantly enhances the removal of grease and mineral stains.

• Fatty Alcohol Polyoxyethylene Ether Sulfate (AES): Best for metal degreasing and equipment spray cleaning. Offers strong emulsification and moderate foaming.

• α-Olefin Sulfonate (AOS): Ideal for high-pressure spray cleaning and alkaline degreasers due to its high temperature and acid/alkali resistance.

• Sodium Dodecylbenzenesulfonate (LAS): A low-cost solution for general industrial detergents; the chelating agent helps overcome LAS's poor hard water resistance.

• Sodium Secondary Alkyl Sulfonate (SAS): Specifically for strong alkaline degreasers (e.g., automotive parts) due to its extreme alkali resistance.

• Fatty Alcohol Ether Carboxylate (AEC): Perfect for electronic components and the food industry where high biodegradability and mildness are required.

III. Nonionic Surfactants: Enhancing Emulsification and Low-Foam Stability

Nonionic surfactants provide excellent stability against salts and acids. Combined with GLDA/MGDA, they improve the dispersion of difficult oils like lubricating or mineral oils.

• AEO Series (AEO-9/AEO-3): Enhances penetration and degreasing in metal cleaning and textile applications.

• Iso-Alcohol Polyoxyethylene Ether (ISO-AEO): Essential for winter formulations (low-temperature fluidity) and low-foaming mechanical parts degreasing.

• TX-10/OP-10: Used for heavy industrial oil pollution (engines and bearings), though environmental alternatives like FMEE are now preferred.

• FMEE-15: A high-temperature, strong alkali-resistant option for hot-rolled steel plate cleaning with superior biodegradability.

• Polyethers (L61/L64): Used as defoamers or emulsifiers in high-pressure cleaning and phosphating pretreatment.

IV. Amphoteric Surfactants: Precision Cleaning and Material Protection

Amphoteric surfactants are used when high material protection is needed (precision instruments) or to reduce formula irritation.

• Cocamidopropyl Betaine (CAB-35): Enhances formula stability in food-grade equipment and precision electronic cleaning.

• Lauramidopropyl Hydroxysulfobetaine (LAHSB): Offers superior salt and alkali resistance for metal surface rust prevention.

V. Strategic Blend Solutions for Specific Industrial Scenarios

1. Strong Alkaline Degreasing (Steel/Automotive Parts)

• Combination: MGDA (5%) + SAS-60 (8%) + FMEE (6%) + Sodium Hydroxide (10%).

• Logic: MGDA prevents metal oxidation while SAS and FMEE emulsify heavy lubricants in high-temperature, high-pH spray environments.

2. Precision Cleaning of Electronic Components (Neutral pH)

• Combination: GLDA (3%) + AEO-9 (4%) + CAB-35 (2%) + Isopropyl Alcohol (5%).

• Logic: GLDA prevents corrosion by capturing trace metals; AEO-9 and CAB-35 provide mild but effective fingerprint and oil removal.

3. General Industrial Heavy Oil Cleaning

• Combination: GLDA/MGDA Blend (4%) + AES (6%) + TX-10 (5%) + Ethanol (3%).

• Logic: A versatile, cost-effective solution where the chelants solve hard water issues while the surfactants tackle mineral oil stains.

VI. Critical Considerations for Successful Compounding

• pH Stability: GLDA/MGDA is most stable between pH 4-12. Avoid direct mixing with concentrated caustic soda or strong acids.

• Foam Management: Use SAS or FMEE for high-pressure sprays; use AES or CAB for immersion/soaking tanks.

• Regulatory Compliance: To meet EU ECOLABEL or REACH, choose AEO or FMEE over branched alkylbenzene sulfonates.