Sodium Stearate

Catalog NumberHG822162

CAS Number822-16-2

CategoryAnionic Surfactants

Synonyms

Stearic acid, sodium salt

Molecular Weight

306.46

Molecular Formula

C18H35NaO2

Appearance

Solid

Application

Use as lubricant.; Use as cleansing agent.; Use as emulsifying agent, dispersing agent.

Active Content

98%

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Case Study

Thermal Stability of Poly(Vinyl Chloride) Using Sodium Stearate-Modified Hydrocalumite

Yang, Huan, et al. Journal of Applied Polymer Science 135.4 (2018): 45758.

This study explored the application of sodium stearate as a surface modification agent to enhance the thermal stabilization efficiency of hydrocalumite in poly(vinyl chloride) (PVC) resins.
Methodology: Hydrocalumite was synthesized via a precipitation transformation method using Ca(OH)2 and Al(OH)3, followed by treatment with Na2CO3. The synthesized hydrocalumite was modified with sodium stearate in aqueous solution under varying conditions, including dosage (1-9 phr), temperature (20-100°C), and stirring duration (20-140 minutes). The modified product was characterized through SEM, static thermal aging tests at 190°C, Congo red assays, and thermal gravimetric analysis to assess compatibility and stabilization effects within PVC.
Key Findings:
· The optimal modification was achieved using 6 wt% sodium stearate at 90°C with 100 minutes of stirring, resulting in significantly improved dispersion and interfacial integration with PVC.
· The modified hydrocalumite extended thermal aging resistance by over 30 minutes at 190°C and delayed Congo red test discoloration by 20 minutes, demonstrating enhanced long-term thermal stability compared to unmodified stabilizers.

Enhancing Asphalt Anti-Aging Performance Using Sodium Stearate-Modified LDHs

Li, Yuanyuan, et al. Construction and Building Materials 172 (2018): 509-518.

This work demonstrated the application of sodium stearate as an organic modifier to improve the compatibility and anti-aging properties of layered double hydroxides (LDHs) in styrene-butadiene-styrene modified asphalt (SBS MA). By addressing the inherent incompatibility between LDHs and asphalt, sodium stearate significantly enhances the functional performance of LDHs as anti-aging additives.
Methodology: LDHs were organically modified using sodium stearate (SS-LDHs) via a wet modification process: 30g LDHs were dispersed in deionized water, combined with 6% (by weight) sodium stearate, and sheared at 500 r/min for 2 hours at 80°C. The modified SS-LDHs were filtered, washed, and dried. Both unmodified LDHs and SS-LDHs were incorporated into SBS MA at 4.0% concentration via high-shear mixing (4000 r/min, 40 min, 170°C). The aging resistance was evaluated through thin film oven tests (thermo-oxidative aging) and UV aging tests, with performance characterized using FTIR, XRD, SEM, UV-Vis spectroscopy, viscosity, and complex modulus measurements.
Key Findings:
· Sodium stearate modification improved the compatibility between LDHs and SBS MA, enhancing dispersion and storage stability.
· Both LDHs and SS-LDHs improved the resistance to thermo-oxidative and UV aging of SBS MA.
· SS-LDHs demonstrated superior anti-aging performance compared to unmodified LDHs.
· The organic modification process enabled more effective inhibition of age-related degradation in asphalt binders.

• Synonyms: Stearic acid, sodium salt
• Molecular Weight: 306.46
• Molecular Formula: C18H35NaO2
• Appearance: Solid
• Application: Use as lubricant.; Use as cleansing agent.; Use as emulsifying agent, dispersing agent.
• Active Content: 98%