Product Details
CasNo： 371-47-1
MF： C4H4Na2O4
Appearance： liquid
Delivery Time： 15 days
Packing： 200kg/drum
Purity： 99%
Basic Properties
Chemical Structure
Polycarboxylate dispersants are typically synthesized via free radical copolymerization of monomers such as acrylic acid, maleic anhydride, and sodium styrene sulfonate, forming comb-shaped or linear polymers with functional groups like carboxyl, sulfonic acid, and polyoxyethylene side chains. For example, TERSPERSE 2700 (Huntsman) is a classic anionic polyacrylate with a hydrophobic backbone and hydrophilic comb-like structures, enabling efficient encapsulation of pesticide particles .
Appearance & Form
Products are available in various forms:
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- Powder/Granule: e.g., TERSPERSE 2700 is a white, free-flowing, dust-free powder with a bulk density of ~0.4g/cm³ .
- Liquid: e.g., SS-5040 is a colorless-to-light-yellow transparent liquid with ~40% active content and pH 7-8 .
Key Parameters
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- Active Content: Typically 30%-98%, varying by grade (e.g., TH-2000 unspecified; polycarboxylate superplasticizer powders ≥98%) .
- pH: 7-9 in 1% aqueous solution (e.g., HS-5040: 7-8; Rohm and Haas Orotan®731A: 7-8) .
- Ionic Type: Predominantly anionic, with sulfonic or phosphonic acid modifications for enhanced stability .
Product Features
High-Efficiency Dispersibility
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- Synergistic Electrostatic Repulsion & Steric Hindrance: Carboxyl and sulfonic groups adsorb onto particle surfaces, creating an electric double-layer repulsion, while polyether side chains provide steric stabilization. For instance, in pesticide WDG formulations, polycarboxylates achieve ≥90% suspension rates for 80% niclosamide WP .
- Low Dosage, High Activity: In coatings, SS-5040 reduces dispersion viscosity of titanium dioxide and calcium carbonate at 0.1%-1.0% dosage, improving gloss and stability .
Stability
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- Temperature Resistance: Modified grades like TH-2000 withstand high temperatures (≥330°C) for extreme environments .
- Electrolyte Tolerance: Sulfonated polycarboxylates (e.g., AA/AMPS copolymers) maintain efficacy in high-hardness water .
Compatibility
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- Works with lignosulfonates and nonionic surfactants. In pesticide SC formulations, blending with emulsifiers reduces viscosity and enhances shelf-life .
Applications
Agrochemicals
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- WDG: TERSPERSE 2700 accelerates disintegration in 75% imidacloprid WDG, forming stable suspensions (recommended dosage: 3%-5%) .
- SC: Prevents particle sedimentation in high-concentration systems (e.g., 80% atrazine SC) .
- WP: Improves wettability and suspension efficiency to reduce spray sedimentation .
Coatings & Inks
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- Waterborne Coatings: SS-5040 and HS-5040 disperse pigments efficiently, enhancing water resistance (e.g., Orotan®731A for high-gloss paints) .
- Waterborne Inks: Ensures uniform pigment dispersion and prevents flocculation .
Construction Materials
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- Polycarboxylate Superplasticizers: Reduce water-cement ratios in concrete (e.g., TH-2000 for high-alkali environments) .
- Ceramic Slurries: TH-908 lowers slurry viscosity for improved molding efficiency .
Water Treatment & Fertilizers
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- Scale Inhibitors: PESA (polyepoxysuccinic acid) prevents calcium carbonate scaling in cooling systems .
- Fertilizer Enhancers: Polyaspartic acid (PASP) chelates metal ions to boost nutrient absorption .
Recommended Dosages
- Agrochemical WDG: 3%-5% (e.g., 6.5% for fluidized-bed granulation of imidacloprid 75% WDG) .
- Agrochemical SC: 2%-2.5% (e.g., 80% niclosamide SC) .
- Coatings: 0.1%-1.0% (based on pigment weight) .
- Concrete Superplasticizers: 0.1%-0.3% (low dosage for significant water reduction) .
- Water Treatment: 10-30mg/L (e.g., TH-2000) .
Storage Conditions
- Moisture & Light Protection: Store powders/granules (e.g., TERSPERSE 2700) in sealed containers in dry, cool areas to avoid caking .
- Freeze & Heat Resistance: Liquids (e.g., SS-5040) should be stored below 40°C and protected from freezing .
- Shelf Life: Typically 12 months under ambient conditions (e.g., HS-5040) .
