Imbentin -U Series effective alternatives to NPE s and Tridecanolethoxylates

Transcription

1 Imbentin -U Series effective alternatives to NPE s and Tridecanolethoxylates

2 Imbentin -U: effective alternatives to NPE s and Tridecanol ethoxylates Imbentin -U products are ethoxylates of iso-undecanol (C11 oxo alcohol PEG-ether). They are efficient alternatives to Nonylphenolethoxylates (NPE s) and iso-tridecanol ethoxylates (C13 oxo alcohol PEG-ether). The Imbentin -U series show good wetting properties and high performance in emulsification. The following graphics compare products with equivalent HLB-value and cloud point. For comparison of all types see last page. Imbentin -U can be used as dispersants, emulsifiers or solubilisers. Potential applications include: industrial and institutional cleaning textile auxiliaries paints and coatings other technical applications, e.g. metal degreasing, agro formulations, emulsion polymers Imbentin -U/7: Undeceth-7 Imbentin -N/55: NP-9 Imbentin -T/8: Trideceth-8 Foaming of Imbentin -T/8, -N/55, -U/7 EN Perforated disc beating method, 25 C, deion. Water Foaming of Imbentin -T/8, -N/55, -U/7 EN Perforated disc beating method, 4 C, deion. Water Foam volume (ml) Foam volume (ml) Time (min) Time (min) The foaming behavior (initial foaming) of Imbentin -U/7 at 25 C is more pronounced than with tridecanol- and nonylphenol ethoxylates. The foam values are comparable after 5 min. At 4 C, the initial foaming of Imbentin -U/7 is relativised. Even after 3 min., the foam values are comparable or better. 3 Wetting power Imbentin -T/8, -N/55, -U/7 on Cotton ISO 822, 199 modified, Draves test, 25 C > 3 s 3 Wetting power Imbentin -T/8, -N/55, -U/7 on Cotton ISO 822, 199 modified, Draves test, 4 C > 3 s 2 2 Wetting time (s) Wetting time (s) Conc. (g/l) Conc. (g/l) The wetting times of Imbentin -U/7 at 25 C are comparable with those of tridecanol- and nonylphenol ethoxylates. At 4 C, the wetting times are reduced in the case of all products. The wetting times are comparable when a quantity of at least.5 g/l is used.

3 Tendency to gel formation in water mixtures at 25 C % H Imbentin-U/7 Imbentin-T/8 Imbentin-N/55 low viscous solution low viscous gel high viscous gel One major advantage of Imbentin -U/7 compared with tridecanol- and nonylphenol ethoxylates is its complete miscibility with water without passing through a gel phase. Static surface tension of Imbentin -T/8, -N/55, -U/7 at 25 C DIN 53914, Wilhelmy plate, Krüss K Increase of Efficiency Surface tension reduction Increase of Effectiveness The lower efficiency of Imbentin -U/7 is not relevant within the usual practical concentrations. The higher effectiveness, however, proves the strong surfactant behavior and lead to better cleaning properties. cmc (mg/l) Conc. (mg/l) The cmc of Imbentin -U/7 is higher than its tridecanol- and nonylphenol ethoxylates counterparts. The obvious advantages of the effectiveness of Imbentin -U/7 compared with nonylphenol ethoxylate are shown in application-relevant concentrations. Dynamic interfacial tension of Imbentin -T/8, -N/55, -U/7 at 25 C. Drop volume method, Krüss DVT 3, g/l Dynamic surface tension of Imbentin -T/8, -N/55, -U/7 at 25 C Bubble pressure method, Krüss BP2, 1 g/l Increase of dynamic interfacial tension reduction Increase of dynamic surface tension reduction Surface age (s) Surface age (ms) The ability to rapidly form a surfactant film on the surface or interface area and to persistently maintain it is an indication of its emulsifying property. In the case of Imbentin -U/7 as well as the comparable products, it is strongly pronounced.

4 Imbentin-U/ Undecanol with... 3 EO 5 EO 6 EO 7 EO 8 EO 1 EO Specifications Appearance (25 C): liquid liquid liquid liquid liquid liquid ph (1% in deion. water): Color (Hazen): max. 6 max. 6 max. 6 max. 6 max. 6 max. 6 Water content [%]: max..5 max..5 max..5 max..5 max..5 max..5 Cloud point (5g in 25g BDG 25% [ C]): Cloud point (1% in deion. water [ C]): Typical properties; (approx.) Viscosity (25 C [mpas]): Density (25 C [g/cm 3 ]): Pour point [ C]: < HLB: Wetting time (2g/l, 25 C, [s]; Draves test): n.a Relative foam heights 1, (.5 g/l, 25 C, [%]): minutes: n.a minutes: n.a Environmental aspects CAS No.: EINECS No.: OECD-Polymer OECD-Polymer OECD-Polymer OECD-Polymer OECD-Polymer OECD-Polymer Biodegradability (OECD 32 B) (%): > 9 > 9 > 9 > 9 > 9 > 9 Biodegradability (OECD 31 B): readily readily readily readily readily readily LC (mg/l): > 11 > 11 > 11 > 26 > 1 > 9 LD (g/kg): ca. 1.4 ca. 1.4 ca. 1.4 ca. 1.4 ca. 1.4 ca. 1.4 Classification symbol: Xi Xi Xn Xn Xn Xn irritant irritant harmful harmful harmful harmful WGK 2 : 2 hazardous 2 hazardous 2 hazardous 2 hazardous 2 hazardous 2 hazardous Alternative 3 to: Nonylphenolethoxylate: Imbentin- Imbentin- Imbentin- Imbentin- Imbentin- Imbentin- N/4 N/6 N/35 N/55 N/63 N/82 (NP4) (NP6) (NP8) (NP9) (NP1) (NP12) Tridecanolethoxylate: Imbentin- Imbentin- Imbentin- Imbentin- Imbentin- Imbentin- T/3, T/ T/7 T/8, T/9 T/12 T/35 T/85 (C13+3EO) (C13+5EO) (C13+7EO) (C13+8EO) (C13+9EO) (C13+12EO) 1 Perforated disc beating method (EN 12728). SDS was used as reference surfactant 2 German List of substances subject to the water endangering substance regulation 3 products with equivalent HLB-value and cloud point Dr. W. Kolb AG CH-898 Hedingen Switzerland Telefon Fax

5 SPECIFICATION CHEMICALS Imbentin -U effective NPE alternatives of Kolb This short study presents results of dynamic surface and interfacial tension of selected isoundecyl alcohol-, isotridecyl alcohol-, and nonylphenol ethoxylates in comparison. The materials investigated are the isoundecyl and isotridecyl alcohol based ethoxylates Imbentin -U/7 (FA11-7EO) and Imbentin -T/8 (FA13-8 EO) and the nonylphenol based ethoxylate Imbentin -N/55 (NP-9EO). The structural characteristics of the products are partly different. There is a similar chemistry in the hydrophilic part (POE chain) but a different chemistry in the lipophilic part of the molecules. NPE s are bulky branched aliphatic/aromatic. FAE s are branched aliphatic. Dynamic surface tension [mn/m] Dynamic surface tension, 25ºC Maximum bubble pressure method, Krüss BP2, 1 g/l NP-9EO FA13-8EO FA11-7EO Surface age [ms] The struture of the surfactant molecules determines the performance. Surface tension is defined as the energy required to create a certain liquid/air interface. When the new surface area created is between two immiscible liquids, this energy is referred to as interfacial tension. The time-dependent dynamic surface and interfacial tension data will prove to be a very characteristic parameter for the evaluation of wetting and emulsification processes. Both processes are determined by the kinetic of adsorption of surfactant molecules at specific interfaces. In the following figure the dependence of the dynamic surface tension from the increasing surface age of NP-9EO, FA11-7EO and FA13-8EO is demonstrated at constant temperature and concentration measured by using the maximum bubble pressure method. The dynamic surface tension of the species observed can be attributed to the speed of the diffusion process of the surfactant molecules at the air-water interface. It seems to be clear that the smallest molecule, such as FA11-7EO, offers the highest diffusion rate in comparison to the short surface age of about 1 to 1 ms and that is why it supports wetting processes. At higher surface ages at about 1 s the data confirm the static surface tension data of the products as expected. In the case of the dynamic interfacial tension date obtained by using the drop volume method the surfactants investigated indicate a strong lowering of the interfacial energy between water and decane. The concentration of the individual surfactants has been kept constant at five times above the c.m.c.. Dynamic interfacial tension data below 1 mn/m could be measured at surface ages between 1 and 1 s which is related to the typical time scale for droplet build up and stabilisation during emulsification processes. Again the fastest dynamic interfacial tension reduction was detected for the FA11-7EO, which implies advantages caused by the molecular size and structure of the molecule. Dynamic interfacial tension µ [mn/m] Dynamic interfacial tension, 25ºC, Decane Drop volume method, Krüss DVT 3 The aim of this paper was to show that short chain highly branched alcohol ethoxylates on the basis of isoundecyl alcohol can act as the alternative products to isotridecyl alcohol ethoxylates and nonylphenol ethoxylates. Dr. H.L. Lothar Möhle, Technical Marketing & Sales Manager Specification Chemicals NP-1EO.24 g/l T-range 12 EO.65 g/l U-range 1 EO 3.1 g/l Surface age [s] (full text version H.L. Möhle, et al. SÖFW Journal 126,6(21) 24 ff)