JP2012077195A - Method for adjusting viscosity of fluid organic substance, and viscosity adjusting agent for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for improving the temperature dependence of the viscosity of a fluid organic substance such as oil by improving the temperature dependence of viscosity without using a polymer material or increasing the viscosity inversely with a rise of temperature, and to provide a viscosity adjusting agent for the method.SOLUTION: A substance capable of forming a lipophilic supramolecule by continuously bonding in a linear and/or reticular shape through hydrogen bond and an auxiliary agent, such as oil-soluble alcohol, having a function to control the bonding force between molecules are added to an oily fluid. Thereby, it becomes possible to reduce or reverse the temperature dependence of the viscosity of the oily fluid in which the supramolecule is dissolved.

Description

  The present invention relates to a method for adjusting the viscosity of a flowable organic substance and a viscosity adjusting agent therefor.

The viscosity of flowable organics often decreases with increasing temperature.
Lubricating oil, a kind of fluid organic substance, is widely used in the fields of industrial machinery and automobiles, and controls friction of moving parts, reduces wear of moving parts, reduces corrosion of moving parts, etc. It has various functions.
In recent years, fuel efficiency of industrial machines and automobiles has been demanded from the viewpoint of protecting the global environment, and improvement of temperature characteristics related to the viscosity of lubricating oil is desired.
In other words, there is an optimum viscosity range for manifesting the function of the lubricating oil. High viscosity deteriorates energy efficiency, and low viscosity loses the lubricating effect. Since the viscosity of the lubricating oil is temperature dependent, it decreases with increasing temperature. Due to the temperature dependence of this viscosity, it was necessary to allow higher viscosity in the low temperature region and lower energy efficiency due to this in order to maintain the required viscosity within the operating temperature range. Therefore, if there is a lubricating oil having a small temperature dependency of viscosity, energy efficiency in the low temperature region does not need to be deteriorated.
In addition, since the standard solution for calibrating viscometers defined in JISZ8809 such as JS10 has temperature dependency, the viscosity does not have temperature dependency or has very low temperature dependency. A standard solution for meter calibration is desired.

Conventionally, it is known to add a polymer viscosity index improver made of a certain polymer for the purpose of improving temperature dependency of a lubricating oil or the like (Patent Documents 1, 2 and the like). The viscosity index is used as a measure of the temperature dependence of the viscosity of the lubricating oil. The larger the viscosity index, the higher the stability against temperature change.
However, such a viscosity index improver is required to have shear stability in addition to the function of improving the viscosity index. In particular, drive system lubricants such as engine oil receive a strong shearing force from the crankshaft, gears, and the like. When a polymer material is used as a viscosity index improver, the shearing force causes the polymer chain of the base polymer. Is cleaved to cause a decrease in molecular weight, and as a result, a viscosity index tends to decrease. In order to improve the shear stability, it is necessary to lower the weight average molecular weight. However, if the weight average molecular weight is lowered, it is necessary to increase the addition amount in order to sufficiently improve the viscosity index.

On the other hand, various gelling agents have been proposed as means for thickening and gelling fluid organic substances such as fats and oils.
For example, Patent Document 3 discloses a gelling agent or solidifying agent containing a benzenecarboxylic acid amide compound obtained by reacting an amino acid alkylamide and benzenecarboxylic acid chloride as an active ingredient. Patent Document 4 discloses an alkyl of cyclohexanetricarboxamide. A thickening / gelling agent containing a derivative as an active ingredient has been proposed. Non-Patent Document 1 describes the thickening effect of trialkyl-1,3,5-benzenetricarboxamide, and Non-Patent Document 2 includes 1-acylamino-3,5-bis (2-ethylhexylaminocarbonyl). ) It describes the thickening effect of benzene.
However, these thickeners and gels do not have a function of improving the temperature dependence of viscosity, or a function of increasing the viscosity conversely as the temperature increases.

JP-A-8-301939 JP 2008-540698 A JP 2000-72736 A Japanese Patent Laid-Open No. 9-344691

Kenji Hanabusa1), Chiemi Koto1), Mutsumi Kimura1), Hirofusa Shirai1) and Akikazu Kakehi2), Chemistry Letters Vol.26 (1997), No.5 p.429 Daisaku Inoue, Yasuhiko Sakakibara, Masahiro Suzuki, Hirofusa Shirai, Akio Kurose, y and Kenji Hanabusa, Chemistry Letters Vol.34 (2005), No.3 p.348 Daisuke Ogata, Toshiyuki Shikata, and Kenji Hanabusa, J. Phys. Chem. B, 2004, 108 (40), pp15503-15510

As described above, a polymer material is mainly used as a material for increasing the viscosity of a flowable organic material, particularly a viscosity index improver used for improving the temperature dependency of a lubricating oil. The polymer substance has a problem that the molecule is irreversibly cut by a strong force such as a shearing force and the viscosity is gradually lowered.
The present invention has been made in view of such a current situation, and without using a polymer substance, by improving the temperature dependence of the viscosity, or by increasing the viscosity conversely as the temperature rises, It is an object of the present invention to provide a method for improving the temperature dependence of a flowable organic substance and a viscosity modifier therefor.

The inventors of the present invention have made extensive studies to achieve the above object, and have studied the use of a substance that forms a supramolecular structure by hydrogen bonding, which has been conventionally used as an organic gelling agent.
Substances in which molecules have a specific structure due to intermolecular interactions such as hydrogen bonds are collectively referred to as supramolecules. Among them, fibers are formed in a two-dimensional array in a medium such as oil by hydrogen bonds. Supramolecule-forming substances that make huge molecular aggregates connected to are known. If the oil-soluble supramolecule-forming substance becomes a macromolecular assembly, it has an action of gelling oil as a medium. The substance having this action is an organic gelling agent, and a medium that is a fluid liquid is taken into a macromolecular network formed by the gelling agent to be gelled (see Non-Patent Document 3, etc.). ).

When the bond between the molecules of this oil-soluble supramolecule-forming substance is not so strong, the present inventors cut and recombine the supramolecular assembly by the fluid force and thermal motion acting on the medium fluid. It came to repeat, and thought that the fluid which is a medium became a fluid and viscous thing instead of a gel.
In addition, oil-soluble supramolecule-forming substances are added to fluid oils such as saturated hydrocarbon oils and liquid paraffin, and alcohols that have an inhibitory effect on supramolecule formation are used as auxiliary agents. Thus, it was found that oil-soluble supramolecular substances can be used as a viscosity modifier for fluid organic substances by actively preparing to weaken intermolecular bonds.

The present invention has been completed based on these findings, and according to the present invention, the following inventions are provided.
[1] Using a substance that forms a lipophilic supramolecule by continuously bonding in a linear and / or network form by hydrogen bonding, and adding an auxiliary agent having a function of controlling the bonding force between the molecules. To reduce or reverse the temperature dependence of the viscosity of the oily fluid in which the supramolecule is dissolved, thereby adjusting the viscosity of the fluid organic substance.
[2] The substance that forms the lipophilic supramolecule is a substance that has a plurality of amide bonds capable of forming intermolecular hydrogen bonds, and thereby continuously bonds linearly to form oil-soluble supramolecules. [1] The method according to [1].
[3] The viscosity adjusting method according to [1] or [2], wherein the auxiliary agent is an oil-soluble alcohol.
[4] The method according to any one of [1] to [3], wherein the substance forming the lipophilic supramolecule is the following general formula (I) or (II):
(Wherein R ^{1 to} R ³ each independently represents an alkyl group having a linear, branched or cyclic structure having 4 to 20 carbon atoms.)
[5] The substance that forms the lipophilic supramolecule is N, N ′, N ″ -tris (3,7-dimethyloctyl) benzene-1,3,5-tricarboxamide (N, N ′, N "-tris (3,7-dimethyloctyl) benzene-1,3,5-tri-carboxyamide) or 1-octadecanoylamino-3,5-bis (2-ethylhexylamino-carbonyl) benzene (1- The method according to [4], which is octadecanoylamino-3,5-bis (2-ethylhexylamino-carbonyl) benzene).
[6] Using as an active ingredient a substance that forms a lipophilic supramolecule that is continuously bonded in a linear and / or network form by hydrogen bonding, and an auxiliary agent that has a function of weakening the bonding force between the molecules. A fluid organic substance viscosity modifier characterized by
[7] The substance that forms the lipophilic supramolecule is a substance that has a plurality of amide bonds capable of forming intermolecular hydrogen bonds, thereby continuously bonding linearly to form oil-soluble supramolecules. [6] The fluid organic viscosity adjuster according to [6].
[8] The fluid organic substance viscosity modifier according to [6] or [7], wherein the auxiliary agent is an oil-soluble alcohol.
[9] The fluid organic substance according to any one of [6] to [8], wherein the substance that forms the lipophilic supramolecule is the following general formula (I) or (II): Viscosity modifier.
(Wherein R ^{1 to} R ³ each independently represents an alkyl group having a linear, branched or cyclic structure having 4 to 20 carbon atoms.)
[10] The substance forming the lipophilic supramolecule is N, N ′, N ″ -tris (3,7-dimethyloctyl) benzene-1,3,5-tri-carboxamide or 1-octadeca The viscosity modifier for fluid organic substances according to [9], which is noylamino-3,5-bis (2-ethylhexylamino-carbonyl) benzene.

  According to the present invention, it is possible to reduce the temperature dependence of the viscosity of the fluid organic substance, or to increase the viscosity in the reverse manner, that is, with increasing temperature. In particular, when the present invention is applied to a lubricating oil, the viscosity at a low temperature can be lowered, contributing to energy saving. Further, in the present invention, since a supermolecule in which low molecules are associated is used without using a polymer, it returns to its original state even when it is cut, so that viscosity stability is expected. Furthermore, since the temperature dependence of the viscosity is small, the viscosity value is easy to reproduce, so the fluid obtained by the present invention is highly valuable as a standard liquid. Furthermore, in the viscosity modifier of the present invention, when there are few substances having a function of weakening intermolecular bonds, a viscoelastic fluid can be obtained.

The figure which shows the temperature dependence of a viscosity when DO3B and dodecanol are added to tridecane as an adjuvant. The figure which shows the temperature dependence of a viscosity when OEH2B and dodecanol are added to tridecane as an adjuvant. The figure which shows the temperature dependence of a viscosity when OEH2B and dodecanol (1.03 w%) are added to tridecane, and it measures by changing a shear rate. The figure which shows the temperature dependence of a viscosity when adding DO3B and benzoic acid as an adjuvant to tridecane The figure which shows the temperature dependence of the viscosity of the DO3B containing solution exposed to high temperature The figure which shows the temperature dependence of a viscosity when mixing the liquid containing paraffin oil (JS10) with the DO3B containing solution exposed to high temperature.

The method of the present invention uses a substance that forms oil-soluble supramolecules that are continuously bonded linearly by hydrogen bonds, and has a function of controlling the bonding force between the molecules of the oil-soluble supramolecular substance. A method for adjusting the viscosity of a fluid organic material, wherein the temperature dependence of the viscosity of the fluid organic material in which the supramolecule is dissolved is reduced or reversed by adding an auxiliary agent such as alcohol.
Further, the fluidity organic viscosity modifier of the present invention is an oil-soluble supramolecular substance that is continuously bonded linearly by hydrogen bonds, and an auxiliary agent that has a function of weakening the bonding force between the molecules of the supramolecular substance. Is an active ingredient.

The oil-soluble supramolecular substance used in the present invention is a lipophilic substance that forms a large molecular assembly linearly connected in a fluid such as oil by hydrogen bonding, and has been conventionally used as an organic gelling agent. A typical example is a substance that has a plurality of amide bonds capable of forming intermolecular hydrogen bonds, and is bonded linearly and continuously to form an oil-soluble supramolecule.
Specifically, it is a lipophilic supramolecular substance having an amide bond as a functional group and continuously bonding in a linear form, and is preferably represented by the following general formula (I) or (II). Are illustrated.

In the above formula, R ^{1 to} R ³ each independently represents an alkyl group having a linear, branched or cyclic structure having 4 to 40 carbon atoms.
As such an alkyl group, specifically, as R ¹ , (CH ₂ ) ₇ CH ₃ , (CH ₂ ) ₁₁ CH ₃ , (CH ₂ ) ₁₇ CH ₃ , C ₂ H ₄ CH (CH ₃ ) C ₃ H ₆ CH (CH ₃ ) ₂ etc., R ² is (CH ₂ ) ₁₀ CH ₃ , (CH ₂ ) ₁₆ CH ₃ etc., R ³ is CH ₂ CH (C ₂ H ₅ ) C ₄ H ₉ and the like.

In the present invention, auxiliary agents having a function of controlling the binding force between the molecules of the supramolecular substance include oil-soluble alcohols, organic carboxylic acids, primary amines and the like. In particular, oil-soluble alcohols include: It is preferably used because it causes a temperature-dependent reversal phenomenon of fluid organic substances.
The oil-soluble alcohol used in the present invention is preferably an aliphatic alcohol such as octanol or dodecanol. This is because those having a small number of carbon atoms such as propanol tend to evaporate and the effect varies, and if the number of carbon atoms is too large, the solubility at low temperatures is deteriorated and the effect of addition of alcohol is lost.
On the other hand, organic carboxylic acids, primary amines, etc. are auxiliary agents that have the function of weakening the intermolecular bonds of the formed supramolecules because they add to lower the viscosity. Similar to the temperature dependency, the viscosity decreases with increasing temperature.

In the present invention, the oil-based fluid to which the oil-soluble supramolecular substance and the auxiliary agent are added is not particularly limited, but is intended for a substance in which a thickening effect due to supramolecule formation is recognized. Examples include saturated hydrocarbon oils such as tridecane, liquid paraffin, and the like.
The required amount of the supramolecule-forming substance to be added depends on the expected thickening effect, but the thickening effect appears from about 0.1 wt% with respect to the fluid organic substance.
Further, the amount of the auxiliary agent added varies depending on the magnitude of the effect of reducing the thickening action of the auxiliary agent, but in the case of alcohol, 0.1 M (molar concentration) (1.3 wt%) with respect to the flowable organic substance %: In terms of octanol) or less than that. When the adjuvant is an acid, the effect is strong and the optimum concentration is lower.
Furthermore, in the present invention, oil-soluble supramolecule-forming substances can be mixed and used. Both show almost the same rheological properties, but the solubility is slightly different, and the solubility can be improved by mixing.

According to the present invention, it is possible to reduce the temperature dependence of the viscosity of the fluid organic substance, or to increase the viscosity in the reverse manner, that is, with increasing temperature.
In particular, when the viscosity adjusting method and the viscosity adjusting agent of the present invention are applied to a lubricating oil, the viscosity at a low temperature can be lowered, contributing to energy saving.
Further, in the present invention, the viscosity is expected to be stable because it returns to its original shape even when it is cut by using a supermolecule associated with low molecules without using a polymer as a viscosity modifier.
Furthermore, since the temperature dependence of the viscosity is small, the viscosity value is easy to reproduce, so the fluid obtained by the present invention is highly valuable as a standard liquid.
Furthermore, in the viscosity modifier of the present invention, when there are few substances having a function of weakening intermolecular bonds, a viscoelastic fluid can be obtained, so that it can also be used as a gelling agent.

  EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to this Example.

First, materials and measurement methods used in Examples and Comparative Examples will be described.
<Oil-soluble supramolecular substances>
・ N, N ', N "-Tris (3,7-dimethyloctyl) benzene-1,3,5-tri-carboxamide (N, N', N" -tris (3,7-dimethyloctyl) benzene-1 , 3,5-tri-carboxyamide) (see Non-Patent Document 1 above, hereinafter referred to as “DO3B”)
1-octadecanoylamino-3,5-bis (2-ethylhexylamino-carbonyl) benzene (see Non-Patent Document 2 above). Hereinafter referred to as “OEH2B”.)
<Adjuvant>
・ Dodecanol ・ benzoic acid <Flowable organic matter>
・ Tridecane
・ Liquid paraffin

<Measurement method of viscosity>
The viscosity was measured using a rotational viscometer. Since the thickened sample is non-Newtonian and is highly likely to exhibit shear rate dependency on viscosity, viscosity measurement was performed while changing the shear rate (changing the number of rotations). In addition, the notation of measurement temperature is set temperature, and when actual temperature is 60 degreeC, it is about 1 degreeC lower.

Example 1
In this example, the temperature dependence of the viscosity when a supramolecule-forming substance and dodecanol as an auxiliary agent were added to a fluid substance was confirmed as follows.
Tridecane was used as the flowable organic substance, and the above DO3B was added as a supramolecule forming substance to a concentration of 5 mwM, and dodecanol was added thereto as an auxiliary agent.
FIG. 1 shows changes in viscosity when DO3B and dodecanol are added to tridecane.
The dodecanol concentrations are 0 mM (♦), 45 mM (■), 90 mM (●), 133 mM (▼) (all concentrations are molal concentration) from the top of the plot, and the viscosity measurement shear rate is 100 s ⁻¹ . is there.
1 that dodecanol is effective as an auxiliary agent that reverses the temperature dependence of the viscosity of tridecane, which is a fluid organic substance.
FIG. 1 shows the result of a sample without an auxiliary agent. As is clear from the result, the sample without an auxiliary agent has a high viscosity. Moreover, non-Newtonian property is also large.

(Example 2)
In this example, tridecane is used as a fluid organic substance, and the above OEH2B is added as a supramolecule-forming substance (concentration is 5 mwM as in Example 1), and dodecanol is also used as an auxiliary agent to increase the temperature dependence of viscosity. I confirmed.
FIG. 2 shows changes in viscosity when OEH2B and dodecanol are added to tridecane.
The concentration of dodecanol is 0 mM (♦), 34 mM (■), 55 mM (●), 89 mM (▼) (all concentrations are molal concentration) from the top of the plot, and the shear rate of the viscosity measurement is 100 s ^−1. It is.
FIG. 2 shows that dodecanol is effective as an auxiliary agent that reverses the temperature dependence of the viscosity of tridecane, which is a flowable organic substance.

  From the results shown in FIG. 1 and FIG. 2, it can be seen that the viscosity increases at a high temperature with a combination of a supramolecule-forming substance and a higher alcohol, the temperature dependence of which is opposite to normal.

(Example 3)
As a result of Example 2 above, it can be seen that a dodecanol concentration of 55 mM (1.03 w%) is optimal in the concentration at which the effect of decreasing the viscosity with decreasing temperature is measured.
In this example, it was confirmed that this sample was a sample whose viscosity varies with the shear rate (non-Newtonian property).
That is, using tridecane as a flowable organic substance, 5 mwM (weight molar concentration) of the above-mentioned OEH2B, which is a supramolecule-forming substance, was added, and a sample was further added with 1.03 w% dodecanol (55 mM plot of Example 2). reference).
About the obtained sample, the viscosity in several shear rates in 10-60 degreeC was measured.
The results are shown in FIG.
The numbers 3.16 (■), 31.6 (●), and 316 (▲) in the figure indicate the shear rate (s ⁻¹ ) for viscosity measurement, respectively.
As is apparent from FIG. 3, it depends on the high temperature viscosity rising shear rate, and at a low shear rate, a viscosity increase of 10 times or more is observed. At 30 ° C., the non-Newtonian property is small, but a temperature-dependent reversal effect exists. That is, it is shown that the non-Newtonian property and the temperature dependency can be adjusted simultaneously by the combination of the supramolecule-forming substance and the adjuvant concentration.

Example 4
In this example, auxiliary agents other than alcohol were confirmed.
Using tridecane as the flowable organic substance, add 5mwM of DO3B, which is a supramolecule-forming substance (concentrations are all in the molar concentration), and then create a sample with 0 to 27.5mwM of benzoic acid to confirm temperature dependence. It was.
FIG. 4 shows the change in viscosity when benzoic acid is added.
The concentration of benzoic acid is 0 mM (♦), 3.7 mM (■), 13.5 mM (●), 27.5 mM (▼) from the top of the plot, and the shear rate of viscosity measurement is 100 s ⁻¹ . is there.
As is apparent from FIG. 4, the temperature dependence of the viscosity when benzoic acid is used as an auxiliary agent shows a characteristic that the viscosity decreases with an increase in the temperature generally observed. It can be seen that it has a function of weakening the intermolecular bond of the formed supramolecule.

(Example 5)
In this example, the temperature dependence of the viscosity when a solution containing only DO3B and no auxiliary agent was exposed to a high temperature was examined.
Using tridecane as the fluid organic substance, a sample in which DO3B was dissolved at 10 mM (molar concentration) was prepared, and heating at about 150 ° C. or higher was repeated for several minutes. Heating was done in air.
Each time heating was repeated, a decrease in viscosity was observed, and the sample was found to be altered by heating.
The sample was heated several times, and the viscosity at 10 to 60 ° C. was measured using a sample whose viscosity was greatly reduced.
The results are shown in FIG. Numbers 32 (●) and 320 (（) in the figure indicate the shear rate (s ⁻¹ ) for viscosity measurement, respectively.
As is clear from FIG. 5, this sample, like the sample seen in the above example, has the temperature dependence of the viscosity reversed, and the sample can be altered by heating without the addition of an auxiliary agent. It has been found that the same effects as described above can be exhibited. It is inferred that some kind of substance having a function of weakening the intermolecular bond corresponding to the above-mentioned auxiliary agent was generated by oxidation of the solvent molecules.
In FIG. 5, it is considered that the two shear rate viscosities are different from each other in terms of measurement, and it can be said that the non-Newtonian property of this sample is very small.

(Example 6)
In this example, it was confirmed that the temperature dependence could be made very small by adding the sample of Example 5 in which it was confirmed that the temperature dependence was reversed to liquid paraffin oil (JS10). JS10 is one of viscometer calibration standard solutions specified in JISZ8809.
The sample used was the mixture used in Example 5 whose viscosity was changed by heating, and the ratio of the sample containing DOB3 was 53%. For comparison, the viscosity of JS10 was also measured.
The result is shown in FIG.
The figure shows that for JS10 only (-■-), when the temperature rises from 10 ° C to 60 ° C, the viscosity becomes about 1/4, while the mixed sample (-▲-) shows the maximum at 40 ° C. It is shown that the viscosity becomes. In this temperature range, the deviation between the maximum value and the minimum value of the viscosity is about 20%. From this, it was confirmed that a sample with reduced temperature dependence of viscosity could be produced.
In this example, the sample of Example 5 was used. However, as shown in Examples 1 and 2, a sample using an auxiliary agent such as an oil-soluble alcohol having a function of reversing the temperature dependence was used. The same effect can be obtained even if there is.

Claims (10)

  By using a substance that forms a lipophilic supramolecule by continuously bonding in a linear and / or network form by hydrogen bonding, and adding an auxiliary agent having a function of controlling the bonding force between the molecules, A method for adjusting the viscosity of a flowable organic material, characterized by reducing or reversing the temperature dependence of the viscosity of an oily fluid in which supramolecules are dissolved.   The lipophilic supramolecule-forming substance has a plurality of amide bonds capable of forming intermolecular hydrogen bonds, and is thus a substance that forms an oil-soluble supramolecule by continuously bonding linearly. The method according to claim 1.   The viscosity adjusting method according to claim 1, wherein the auxiliary agent is an oil-soluble alcohol. The method according to any one of claims 1 to 3, wherein the substance forming the lipophilic supramolecule is the following general formula (I) or (II).
(Wherein R ^{1 to} R ³ each independently represents an alkyl group having a linear, branched or cyclic structure having 4 to 20 carbon atoms.)   The substance forming the lipophilic supramolecule is N, N ', N "-tris (3,7-dimethyloctyl) benzene-1,3,5-tri-carboxamide or 1-octadecanoylamino- The process according to claim 4, characterized in that it is 3,5-bis (2-ethylhexylamino-carbonyl) benzene.   It is characterized by comprising as an active ingredient a substance that forms a lipophilic supramolecule that is continuously bonded linearly and / or in a network form by hydrogen bonding, and an auxiliary agent that has a function to weaken the bonding force between the molecules. Viscosity modifier for fluid organics.   The lipophilic supramolecule-forming substance has a plurality of amide bonds capable of forming intermolecular hydrogen bonds, and is thus a substance that forms an oil-soluble supramolecule by continuously bonding linearly. The viscosity modifier for fluid organic substances according to claim 6.   8. The fluid organic substance viscosity modifier according to claim 6 or 7, wherein the auxiliary agent is an oil-soluble alcohol. 9. The fluid organic substance viscosity modifier according to any one of claims 6 to 8, wherein the substance that forms the lipophilic supramolecule is the following general formula (I) or (II): .
(Wherein R ^{1 to} R ³ each independently represents an alkyl group having a linear, branched or cyclic structure having 4 to 20 carbon atoms.)   The substance forming the lipophilic supramolecule is N, N ', N "-tris (3,7-dimethyloctyl) benzene-1,3,5-tri-carboxamide or 1-octadecanoylamino- The fluid organic substance viscosity modifier according to claim 9, which is 3,5-bis (2-ethylhexylamino-carbonyl) benzene.