US20170114229A1 - Amine-Functionalized Organosilane/Fatty Acid Combination Systems As Stain/Corrosion Inhibitors For The Application On Aluminum And Its Alloys - Google Patents

Amine-Functionalized Organosilane/Fatty Acid Combination Systems As Stain/Corrosion Inhibitors For The Application On Aluminum And Its Alloys Download PDF

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US20170114229A1
US20170114229A1 US15/297,240 US201615297240A US2017114229A1 US 20170114229 A1 US20170114229 A1 US 20170114229A1 US 201615297240 A US201615297240 A US 201615297240A US 2017114229 A1 US2017114229 A1 US 2017114229A1
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Prior art keywords
amine
fatty acid
composition according
composition
oligomer
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Hoon Kim
Ronald ASCENZO
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Chemetall US Inc
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Chemetall US Inc
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    • C07F7/0803—Compounds with Si-C or Si-Si linkages
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Definitions

  • This present invention relates to a composition for treating aluminum containing surfaces providing improved inhibition of aluminum staining/corrosion as well as to a method for producing said composition, a method for treating aluminum containing surfaces with said composition and the use of said composition as a metal working fluid and/or rust preventive.
  • stain describes a type of corrosion, which is mainly used for non-ferrous metals including aluminum.
  • MVF metal working fluid
  • aluminum staining comes from a low pH of below 4 or a high pH of above 8.5. Stain/corrosion on aluminum and its alloys has a detrimental effect on its surface properties and typically ends up with impairment in value of the finished products. Therefore, significant technical effort and research activity have been devoted to remove or at least minimize this unfavorable damage on the metal surface.
  • the present invention deals with a composition for treating aluminum containing surfaces providing improved inhibition of aluminum staining/corrosion in the absence of microbial proliferation and gelling issues.
  • said composition should exhibit improved properties in terms lubricity and more preferably regarding concentrate stability, hard water stability and/or anti-foaming as well.
  • the composition for treating aluminum containing surfaces comprises the reaction product of at least one amine-functionalized organosilane and/or oligomer and/or polymer thereof and at least one fatty acid, wherein the molar ratio of the amino group/s of the at least one amine-functionalized organosilane and/or oligomer and/or polymer thereof and of the at least one fatty acid is 1.2:1 to 1:2, and wherein the at least one amine-functionalized organosilane and/or oligomer and/or polymer thereof is linked to the at least one fatty acid by at least one carboxylic acid/amine salt bond and/or at least one amide bond.
  • Aluminum containing surfaces being treated with the composition according to the invention exhibit a barrier layer in the interface between the metallic surface and the liquid phase preventing corrosive chemicals from accessing the metallic surface.
  • the polar head group of said reaction product originating from the amine-functionalized organosilane is adsorbed on the metallic surface, while the non-polar tail group originating from the fatty acid is positioned toward the liquid phase repelling the access of water.
  • the aluminum containing surface to be treated preferably consists of aluminum or an aluminum alloy containing other elements like Cu, Si, Mg and/or Zn, more preferably of one of the cast aluminum alloys Al319 and Al356-T6 or one of the wrought aluminum alloys Al6061-T6 and Al7075.
  • An “aluminum containing surface” in the sense of the present invention may also consist of be aluminum or an aluminum alloy coated with a conversion or passivation layer.
  • amine-functionalized organosilane stands for an amine-functionalized organosilane and/or oligomer and/or polymer thereof, which may originate from the (partial) hydrolysis of the amine-functionalized organosilane and the subsequent (partial) condensation of the hydrolysis product, i.e. the corresponding organosilanol.
  • the at least one amine-functionalized organosilane may be a single organosilane or a mixture of two or more different organosilanes.
  • the at least one amine-functionalized organosilane has at least one hydrocarbyl moiety, which carries at least one amino group. As amino group/s primary —NH 2 is preferred.
  • the organosilane preferably has one hydrocarbyl moiety carrying one amino group. However, it may also have two or more hydrocarbyl moieties carrying one or two or more amino groups.
  • hydrocarbyl moiety/ies alkyl is preferred, more preferably alkyl having three or more carbon atoms.
  • at least one amine-functionalized organosilane having two or more alkyl groups and/or branched alkyl groups may be used being more stable in terms of hydrolysis. However, the adhesion of such organonosilanes to the treated aluminum containing surface is lower.
  • the at least one amine-functionalized organosilane preferably has one or more hydrocarbyloxy moiety, wherein the sum of the hydrocarbyl and the hydrocarbyloxy moieties is preferably four, i.e. there is/are no other moiety/ies at the central silicon atom of the organosilane.
  • hydrocarbyloxy moiety/ies alkyloxy is preferred.
  • the at least one amine-functionalized organosilane may also have one or more —OH groups instead of the one or more hydrocarbyloxy group.
  • the at least one amine-functionalized organosilane is an aminoalkyl trialkoxysilane and most preferably 3-aminopropyl triethoxysilane.
  • the composition comprises at least one oligomer and/or polymer of an amine-functionalized organosilane.
  • oligomers and/or polymers leads to enhanced stability of the composition.
  • the at least one fatty acid may be a single fatty acid or a mixture of two or more different fatty acids.
  • the at least one fatty acid preferably has at least 8, more preferably at least 12, more preferably at least 16 and especially preferably at least 20 carbon atoms. Long chain fatty acids result in increased lubricity of the composition and are therefore preferred.
  • hydrophobic nature of long hydrocarbon tails suppresses undesirable gel formation within the composition by preventing excess hydrolysis and subsequent condensation.
  • Non-polar hydrocarbon chains repel water and, thus, reduce the chance of water contact to the amine-functionalized organosilane.
  • the at least one fatty acid preferably has 8 to 22 carbon atoms.
  • the at least one fatty acid has a branched hydrocarbon tail, preferably with at least one side chain having at least 2 carbon atoms and more preferably with at least on side chain having at least 4 carbon atoms.
  • branched hydrocarbon tails are advantageous, if the aluminum containing surface is treated with an amine-functionalized organosilane and/or oligomer and/or polymer thereof having a large polar head group, e.g. 3-triethoxysilyl-propylamino-.
  • the adhesion of the at least one fatty acid to the aluminum containing surface may be enhanced by introducing at least one C ⁇ C double bond into the at least one fatty acid, as there is an attraction between C ⁇ C double bonds and aluminum.
  • the at least one fatty acid preferably has a hydrocarbon tail exhibiting at least one C ⁇ C double bond, more preferably at least one C ⁇ C double bond in cis configuration, as the latter is expected to especially enhance the adsorption to the aluminum containing surface.
  • the at least one fatty acid is erucic acid.
  • composition according to the invention as well as of the resulting barrier layer may be tailored for the intended application by using a mixture of at least two fatty acids with different hydrocarbon tails (number of carbon atoms, hydrophobicity/hydrophilicity, unbranched/branched, saturated/unsaturated) as the at least one fatty acid.
  • the thickness and density as well as the adsorption of the barrier layer on the treated aluminum containing surface depend on the length and structure of the hydrocarbon tail(s) of the applied at least one fatty acid as well as on the structure of the used at least one amine-functionalized organosilane. Branched tails lead to films being less dense and less thick but exhibiting strong adsorption, whereas long, linear tails result in films having higher density and thickness at the cost of some adsorption strength.
  • a large head group originating from the organosilane results in films having lower density and thickness but with strong adsorption, whereas a small head group leads to films being denser and thicker accompanied with some loss in adsorption strength.
  • the molar ratio of the amino group/s of the at least one amine-functionalized organosilane and/or oligomer and/or polymer thereof and of the at least one fatty acid is preferably 1.1:1 to 1:1.5 and more preferably 1.0:1 to 1:1.2.
  • composition for treating aluminum containing surfaces according to the invention may be prepared by diluting a suitable concentrate, preferably by a factor of 1:10 to 1:20 (corresponding to 5 to 10 wt.-% of concentrate), with a suitable solvent, preferably deionized water, and—if necessary—subsequently adjusting the pH value with a suitable pH modifying agent.
  • the at least one amine-functionalized organosilane and/or oligomer and/or polymer thereof is preferably comprised in a concentration of 0.1 to 4 wt.-%, more preferably 0.2 to 2.0 wt.-% and especially preferably 0.6 to 1 wt.-%
  • the at least one fatty acid is preferably comprised in a concentration of 0.1 to 4 wt.-%, more preferably 0.3 to 3 wt.-% and especially preferably 1.0 to 1.4 wt.-%.
  • the at least one amine-functionalized organosilane and/or oligomer and/or polymer thereof is preferably comprised in a concentration of 0.005 to 0.4 wt.-%, more preferably 0.01 to 0.2 wt.-% and especially preferably 0.03 to 0.1 wt.-%
  • the at least one fatty acid is preferably comprised in a concentration of 0.005 to 0.4 wt.-%, more preferably 0.015 to 0.3 wt.-% and especially preferably 0.05 to 0.14 wt.-%.
  • the concentrate mentioned above additionally comprises 30 to 60 wt.-% of naphthenic oil, 5 to 25 wt.-% of deionized water, 2 to 6 wt.-% of 2-amino-2-methyl-propanol, 2 to 6 wt.-% of triethanol amine, 0.2 to 2 wt.-% of boric acid, 3 to 7 wt.-% of an approximately 1:1 molar ratio mixture of dodecanedioic acid and triethanol amine, 1 to 3 wt.-% of 3-amino-4-octanol, 1 to 3 wt.-% of a polyethylene oxide of a carboxylic acid, 0.2 to 2 wt.-% of a dicarboxy fatty acid, 2 to 6 wt.-% of polymerized ricinoleic acid, 2 to 6 wt.-% of a polymeric ester, 2 to 6 wt.-% of eurucic acid, 2 to 6 w
  • the composition for treating aluminum containing surfaces additionally comprises 0.1 to 0.6 wt.-% of 2-amino-2-methyl-propanol, 0.1 to 0.6 wt.-% of triethanol amine, 0.01 to 0.2 wt.-% of boric acid, 0.15 to 0.7 wt.-% of an approximately 1:1 molar ratio mixture of dodecanedioic acid and triethanol amine, 0.05 to 0.3 wt.-% of 3-amino-4-octanol, 0.05 to 0.3 wt.-% of a polyethylene oxide of a carboxylic acid, 0.01 to 0.2 wt.-% of a dicarboxy fatty acid, 0.1 to 0.6 wt.-% of polymerized ricinoleic acid, 0.1 to 0.6 wt.-% of a polymeric ester, 0.1 to 0.6 wt.-% of eurucic acid, 0.1 to 0.6 wt.-% of an
  • the composition is an aqueous composition, which means, that more than 50 wt.-% of the solvent/s is water, e.g. when the concentrate is predominantly diluted with water as a solvent.
  • the composition may also comprise a synthetic oil and/or a mineral oil as a solvent, e.g. naphthenic oil.
  • the composition Due to the additional use of such an oil, the composition has the advantage of combining good lubricity with high cooling capacity.
  • the pH value of the composition preferably lies in the range of 8.5 to 10.5, more preferably in the range of 9.0 to 10.0 and especially preferably in the range of 9.2 to 9.7.
  • the present invention also includes a method for producing a composition according to the invention. In this process
  • step ii) the alkoxygroups of the remaining at least one organosilane and/or the respective organosilane moiety are at least partially hydrolyzed by the water produced in the formation of the amide bonds and the silanol groups resulting from this hydrolysis are then at least partially condensed.
  • Step ii) is based on a typical exothermic acid/base reaction.
  • the ratio of ionic to amide linkage as well as the amount of oligomeric and polymeric amino-functionalized organosilane species in the composition depends on the degree of exothermicity.
  • step ii) is conducted at room temperature.
  • the reaction time in step ii) is preferably more than 30 minutes and especially preferably more than 40 minutes. This way, no detectable oligomeric/polymeric species are obtained in the reaction product and, hence, the latter exhibits a low grade of viscosity.
  • step ii) is performed at a temperature above room temperature, preferably above 40° C. and especially preferably above 60° C. Increasing temperature leads to an increasing amount of oligomeric/polymeric species as well and, thus, to a reaction product with a higher grade of viscosity.
  • step ii) is conducted at a temperature of between approx. 70° C. and approx. 90° C.
  • the reaction time in step ii) is preferably more than 4 hours, more preferably more than 6 hours and especially preferably approx. 8 hours.
  • the invention also comprises a method for treating aluminum containing surfaces, wherein an aluminum containing surface is brought into contact with a composition according to the invention and then optionally rinsed.
  • composition according to the invention is preferably used as an essentially non-staining metal working fluid and/or a rust preventive for aluminum containing surfaces.
  • a first comparative concentrate (C1; metal working fluid) was prepared by mixing 15.6 g of deionized water, 4.0 g of 2-amino-2-methyl-propanol, 4.0 g of triethanol amine, 1.0 g of boric acid, 5.0 g of a 1:1 molar ratio mixture of dodecanedioic acid and triethanol amine, 1.8 g of 3-amino-4-octanol, 2.0 g of a polyethylene oxide of a carboxylic acid, 1.1 g of a dicarboxy fatty acid, 4.0 g of polymerized ricinoleic acid, 4.0 g of a polymeric ester, 4.0 g of eurucic acid, 4.0 g of an ethoxylated fatty alcohol as a non-ionic surfactant, 47.0 g of naphthenic oil, 1.0 g of 3-iodo-2-propymyl butyl carbamate, 0.1 g of a defoa
  • a second comparative concentrate (C2) was obtained by separately dropping 0.8 g of tetraethoxysilane and 1.7 g of OcenolTM (>80 wt.-% of oleyl alcohol and ⁇ 20 wt.-% of cetyl alcohol; BASF, Germany) into 97.5 g of a concentrate according to C1 and stirring the resulting mixture for 40 minutes at room temperature.
  • OcenolTM >80 wt.-% of oleyl alcohol and ⁇ 20 wt.-% of cetyl alcohol; BASF, Germany
  • a third comparative concentrate (C3) was obtained by mixing 0.8 g of tetraethoxysilane and 1.7 g of OcenolTM (>80 wt.-% of oleyl alcohol and ⁇ 20 wt.-% of cetyl alcohol; BASF, Germany) and stirring the resulting mixture for 8 hours at a temperature of 75° C. After having been cooled down to room temperature, the reaction product was mixed with 97.5 g of a concentrate according to C1 and the resulting mixture was stirred for 40 minutes at room temperature.
  • OcenolTM >80 wt.-% of oleyl alcohol and ⁇ 20 wt.-% of cetyl alcohol; BASF, Germany
  • a concentrate according to the invention (E1) was prepared by i) mixing 0.8 g of 3-aminopropyl triethoxysilane and 1.2 g of erucic acid, ii) subjecting the resulting mixture for 40 minutes to room temperature, and iii) dropping 2.0 g of the reaction product (corrosion/stain inhibitor according to the invention) into 98 g of a concentrate according to C1.
  • step ii) the reaction product was analyzed by FT-IR. According to the peak intensity ratio of the amide bond at 1640 cm ⁇ 1 and the carboxylic acid/amine salt bond at 1560 cm ⁇ 1 , approx. 10 mol-% of the linkages between aminopropyl triethoxysilane and erucic acid were amide bonds.
  • a concentrate according to the invention (E1) was prepared by i) mixing 0.8 g of 3-aminopropyl triethoxysilane and 1.2 g of erucic acid, ii) subjecting the resulting mixture for 8 hours to a temperature of 75° C., and iii) dropping 2.0 g of the reaction product (corrosion/stain inhibitor according to the invention) into 98 g of a concentrate according to C1.
  • step ii) the reaction product was analyzed by FT-IR. According to the peak intensity ratio of the amide bond at 1640 cm ⁇ 1 and the carboxylic acid/amine salt bond at 1560 cm ⁇ 1 , approx. 15 mol-% of the linkages between aminopropyl triethoxysilane and erucic acid were amide bonds.
  • the following table shows the difference between the final and the initial value of backscattering in % ( ⁇ BS %)—in the bottom, in the middle as well as in the top region of the 0 to 50 mm range.
  • Foaming is detrimental for MWFs, since foam introduces air onto the metal surface. This leads to accelerated corrosion and also prevents the formation of a uniform tribological film on the metal surface causing low lubricity.
  • composition E1 The amount of foam is significantly lower with composition E1 than with C1. This may be regarded as a clear advantage of E1, as for different reasons the production of foam is undesirable.
  • compositions C1 and E1 were each applied to a 6061 Aluminum test plate, and a so-called Micro Tap Test was performed by means of a special testing device simulating a thread tapping machine operation. Said device measures the torque force required for tapping metalworking: The lower the measured force, the better the lubricity.
  • the use of composition E1 leads to an 18% better lubricity relative to the use of C1.
  • test plates 10 parts by volume of concentrate C1 or E1 were added to 90 parts by volume of DI water and mixed. Test plates of 319 Aluminum, 356-T6 Aluminum or 6061-T6 Aluminum were kept in the resulting compositions C1 and E1 for 24 hours. After that, the test plates appeared as follows.
  • Composition 319 Aluminum 356-T6 Aluminum 6061-T6 Aluminum C1 light stain light stain very light stain E1 no stain no stain no stain no stain
  • the inhibitor of E1 according to the invention results in enhanced stain inhibition compared to C1.

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MX2020005096A (es) 2017-11-15 2020-10-28 Chemetall U S Inc Aplicacion de sistema combinado de organosilano funcionalizado con amina y acido graso como inhibidores de la corrosion en los recubrimientos permanentes emisores transparentes sobre aleacion de aluminio/zinc.
MX2020013971A (es) * 2018-06-18 2021-03-25 Chemetall U S Inc Sistemas combinados de organosilano/organofosfato funcionalizados con aminas como agentes de ep/inhibidores de la corrosion en composiciones para el tratamiento de superficies metalicas.

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