Page 116 - Handbook of Surface Improvement and Modification

7.2 Additives used 111

7.2 ADDITIVES USED

Polydimethylsiloxane, modified

GENERAL INFORMATION
Name: polydimethylsiloxane, modified
CAS #: 1330-20-7, 34590-94-8, 64742-95-6, 70657-70-4; 134180-76-0
Active ingredient, wt%: 32-100 Solids content, wt%: 52-100
Product composition: polyether-modified polydimethylsiloxane, 0.1-1% xylene; 52% polyether-
modified polydimethylsiloxane in 46-47% 2-methoxymethylethoxypropanol; 100% polyether-
modified siloxane; polyester modified hydroxy functional polydimethylsiloxane solution in 40-
41% xylene, 16-17% ethylbenzene, 8% solvent naphtha, petroleum, light aromatic, 5-6% cyclo-
hexane, 5-6% 2-phenoxyethanol, and other impurities like cumene <0.1%; nonionic siloxane-
based; 52% silicone-modified polyacrylate, 47-48% 1-ethoxy-2-propanol acetate, <0.1% 2-meth-
oxy-1-propanol acetate (impurity); 10-<25% polyether modified trisiloxane
PHYSICAL PROPERTIES
State: liquid Odor: specific HLB value: 1.7
Color: clear, colorless, hazy, amber, yellow, light brown, brown
3
o
o
Melting point, C: -14 to 7 Boiling point, C: >100 to 339 Density, kg/m : 920-1075
o
Surface tension at 25 C, mN/m: 34.2; 25.8 at 0.1 wt% in water/equilibrium surface tension reduc-
tion; 28.4 at 6 Hz at 0.1 wt% in water/dynamic surface tension reduction
o
Refractive index: 1.434 Vapor pressure at 20 C, kPa: 0.001 to 0.012
o
Viscosity at 20 C, mPas: 30-1400 pH: 6-8
Volatility VOC, %: 0.0/2.4/EPA method 24
HEALTH & SAFETY
o
Autoignition, C: >200 Rat oral LD50, mg/kg: >2000 to >8000/product; 3523/xylene
Carcinogenic: NTP, IARC, OSHA, ACGIH: No component of this product present at levels
greater than or equal to 0.1% is identified as a known or anticipated carcinogen.
o
Flash point, C: 25 to 166 OSHA, PEL, ppm: 100/xylene; STEL150/xylene
Rabbit dermal LD50, mg/kg: >9500/DPM; 1700/xylene; >5500/ethylbenzene
UN/NA class: 1993, 3072, 3082
ECOLOGICAL PROPERTIES
Aquatic toxicity, Green algae, 96-h, LC50: 20.7/72H
Aquatic toxicity, Daphnia magna, 48-h, EC50: 58 to >100
Biodegradation probability: 0%/28d/not readily biodegradable
USE & PERFORMANCE
Outstanding properties: Provide a strong reduction in the surface tension of coating systems.
Improve substrate wetting and prevent cratering. Surface slip, gloss and antiblocking are increased.
Significantly decreased surface tension in aqueous system. Increased surface slip and the coating
benefit from a higher scratch resistance. The product stabilized foam much less than other highly
active additives that contain silicone. Highly effective with the highest compatibility. Especially
useful in fine atomization of a spray application. Provide slip and mar resistance. The superwetting
surfactant is an optimized siloxane-based surfactant providing excellent equilibrium and dynamic
surface tension.