JP2020125402A - Thixotropic agent - Google Patents

Abstract

To provide a thixotropic agent having excellent thixotropic property.SOLUTION: A thixotropic agent in which a 2:1 type layered silicate ore having a metal ion between layers is dispersed in a dispersant, in which a Hansen solubility parameter (SP value) of the dispersing medium is 10 cal/cmor larger, and an aqueous complexan type ligand cross-linked with an aqueous polymer is coordinated to the metal ion. Here, the aqueous polymer preferably has a carbodiimide group and/or an oxazoline group and the aqueous complexan type ligand has also a carboxy group and/or an aqueous group.SELECTED DRAWING: None

Description

The present invention relates to a thixotropic agent that exhibits thixotropic properties.

The general definition of fluid is that it flows when stress is applied. There are many kinds of fluids such as single phase, mixed system, dispersion system and solution system, and they are roughly classified into two types, simple fluid and structural fluid. Conventionally, most of fluid materials are structural fluids, and the structural fluids do not show linear behavior like Newtonian fluid between given stress and flow, and the shear rate increases and the viscosity increases as the applied stress increases. Decrease. This is called shear thinning, but there are fluid materials that do not have a yield value or that do not show a Newtonian even when the yield value is exceeded. There are fluid materials that exhibit characteristic viscous properties such as plastic flow.

BACKGROUND ART Conventionally, in products involving fluids such as cosmetics and paints, a thixotropic agent is added for the purpose of preventing sedimentation of dispersoids and adjusting viscosity. For example, cosmetics often contain a thixotropic agent as a thickener, a stabilizer, a setting agent, a texture improving agent, a suspending agent and the like. When a thixotropic agent is blended as a thickener, a polymeric thixotropic agent is often used. As such thixotropic agents, natural, semi-synthetic and synthetic water-soluble polymers are mainly used, and specific examples thereof include natural or synthetic polysaccharides, those having a cellulose structure or an acrylic structure, and carboxyvinyl polymers, carboxy. Examples thereof include sodium methyl cellulose, xanthan gum, sodium polyacrylate, hydroxyethyl cellulose, hydroxypropyl cellulose and the like. These are inexpensive, have a high flow control effect, and gel in a small amount.

Further, Patent Document 1 includes a clay mineral compound composed of a phyllosilicate mineral having at least one of an alkali metal ion and an alkaline earth metal ion as a metal ion between layers, and the clay mineral compound is an organic compound to the metal ion. A thixotropic agent has been proposed in which a metal complex compound formed by bonding a ligand is introduced as an active species between the layers of the phyllosilicate mineral. Further, Patent Document 2 proposes a gel ink for a water-based ballpoint pen containing xanthan gum and a hectorite inorganic thickener as a thickening gelling agent.

JP, 2013-185061, A JP, 11-148043, A

However, although the thixotropic agent of Patent Document 1 can impart a certain degree of thixotropy to an object, it cannot be said that a satisfactory effect is obtained, and further improvement in thixotropy is required. Further, if a time elapses after the addition, a problem of water separation and bed separation may occur, and a sufficient effect may not be exhibited.

Further, the ink proposed in Patent Document 2 has a problem in heat resistance when a thickening gelling agent is used, and may cause a phenomenon of water separation and bed separation. Further, the ink proposed in Patent Document 2 may not be able to obtain a satisfactory thixotropic property from the viewpoint of stability.

Therefore, in view of the above problems inherent in the prior art, the present invention is proposed to suitably solve these problems, and an object thereof is to provide a thixotropic agent capable of imparting good thixotropy.

A thixotropic agent according to the present invention which solves the above problems and achieves a desired object is a thixotropic agent in which a 2:1 type layered silicate mineral having metal ions between layers is dispersed in a dispersion medium. The dispersion medium has a Hansen solubility parameter (SP value) of 10 cal/cm ³ or more, and a water-soluble complexan type ligand cross-linked with a water-soluble polymer is coordinated with the metal ion. Is characterized by.

In the thixotropic agent having the above structure, it is preferable that the water-soluble polymer has a carbodiimide group and/or an oxazoline group, and the water-soluble complexan type ligand has a carboxyl group and/or a hydroxyl group.

In the thixotropic agent having the above structure, it is preferable that the metal ion is an alkali metal ion and/or an alkaline earth metal ion.

In the thixotropic agent having the above structure, the layer charge of the 2:1 layered silicate mineral is preferably 0.2 or more and 0.9 or less.

In the thixotropic agent having the above structure, the content of the 2:1 layered silicate mineral is preferably 7% by mass or more and 25% by mass or less.

In the thixotropic agent having the above structure, the dispersion medium is cyclohexanol, n-butanol, isopropyl alcohol, dimethylformamide, ethanol, methanol, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, polypropylene. It is preferable to use one or a combination of two or more selected from the group consisting of glycol, glycenol, formamide, N-methyl-2pyrrolidone and water.

In the thixotropic agent having the above structure, the water-soluble complexan type ligand preferably has a molecular weight of 150 or more and 750 or less.

The thixotropic agent according to the present invention can impart good thixotropy.

One of the major characteristics of the present invention is that the Hansen solubility parameter (SP value) of the dispersion medium in which the 2:1 type layered silicate mineral is dispersed is 10 cal/cm ³ or more. The Hansen solubility parameter (SP value) is a measure of the affinity between substances indicating how much a certain substance dissolves in another substance, and also the wettability, adhesiveness, and dispersibility of dispersed particles. Used for evaluation, etc. By using such a dispersion medium having an SP value of 10 cal/cm ³ or more, the fine particles of the 2:1 type layered silicate mineral can be uniformly dispersed, and the water-soluble complexan type coordination described later is performed. The child can be intercalated between the layers of the silicate mineral, and good thixotropy is exhibited. Examples of the dispersion medium used in the present invention include cyclohexanol (11.4), n-butanol (11.4), isopropyl alcohol (11.5), propylene glycol (12.6), and 1,3-butylene. Glycol (11.0), dimethylformamide (12), ethanol (12.7), methanol (14.5), ethylene glycol (14.6), glycerol (16.5), formamide (19.2), N -Methyl-2pyrrolidone (10.8), water (23.4) and the like may be used alone or in combination of two or more (SP value in parentheses).

Another major feature of the present invention is that metal ions existing between layers of a 2:1 type layered silicate mineral are coordinated with a water-soluble complexan type ligand cross-linked with a water-soluble polymer. It is in.

Examples of the metal ions existing between the layers of the 2:1 type layered silicate mineral include alkali metal ions such as sodium ions and potassium ions, alkaline earth metal ions such as calcium ions, and the like. When the silicate mineral is dispersed in the dispersion medium, water or the like in the dispersion medium enters between layers to coordinate with metal ions and swell the silicate mineral. This is because the hydration energy due to the hydration of metal ions located between the layers is larger than the bonding force between the layers of the silicate mineral. When the silicate mineral is swollen in this way, it becomes easy to intercalate a water-soluble complexan-type ligand described later into the silicate mineral.

The 2:1 type layered silicate mineral used in the present invention has one alumina octahedral sheet bonded between two silica tetrahedral sheets to form one aluminum silicate unit layer. Are laminated and configured. In the present invention, as described above, between the two unit layers (interlayer), alkali metal ions such as sodium ions and potassium ions and alkaline earth metal ions such as calcium ions are present as interlayer metal ions. .. As such a 2:1 type layered silicate mineral, either naturally occurring natural clay minerals or chemically synthesized synthetic clay minerals can be adopted, but natural minerals and metals A synthetic clay mineral obtained by a synthetic method such as a hydrothermal reaction method or a melting method using an inorganic compound having an ion as a starting material is preferable.

Synthetic clay minerals are free from impurities such as iron oxide that natural clay minerals have, and the diameter of primary particles is adjusted to 15 nm or more and 35 nm or less, compared with the natural particles whose primary particles are 500 nm or more and 1000 nm or less. be able to. In addition, synthetic clay minerals have a large degree of freedom in terms of chemical composition obtained by adjusting the chemical composition and synthesis conditions at the synthetic stage, and improve functions such as swellability and ion exchange capacity compared with natural clay minerals. You can In particular, if the thixotropic agent of the present invention is used as an additive for cosmetics, it is preferable to use a synthetic clay mineral from which elements that affect humans such as heavy metals are excluded as a raw material. The 2:1 type layered silicate mineral obtained by the synthesis can have various chemical compositions such as one containing fluorine on the anion side and one containing no fluorine, but it does not contain fluorine. A type 1 layered silicate mineral is preferred. A 2:1 type layered silicate mineral containing no fluorine as an anion does not prevent the elution of cations by a fluorine ion when dispersed in an aqueous liquid dispersion medium, and therefore contains a fluorine as an anion 2: The clay mineral compound obtained by intercalating the 2:1 type layered silicate mineral containing no fluorine, as compared with the clay mineral compound obtained by intercalating the type 1 layered silicate mineral, exhibits good thixotropy. The clay mineral compound is not limited to being composed of one type of 2:1 type layered silicate mineral, and a plurality of types of 2:1 type layered silicate minerals may be used in combination. The 2:1 type layered silicate mineral preferably has a primary particle diameter of 500 nm or less.

Examples of the 2:1 type layered silicate mineral include talc-pyrophyllite group such as talc and pyrophyllite (layer charge: 0); smectite group such as saponite, hectorite, montmorillonite, and beidellite (layer charge: 0). 2-0.6); Vermiculite group; Leicalite, illite, paragonite, muscovite mica (mica) family (layer charge: 1.0 or less); Clintnite, margarite and other brittle mica family (layer charge: 2.0 or less); chlorites (layer charge: variable) such as clinochlore, chamosite, nimite, donbasite, kukkeite, and sudoite can be used. Among these, smectite group and mica group having a layer charge of 0.2 or more and 0.9 or less are preferably used.

As the smectite group, sodium type montmorillonite, calcium type montmorillonite, activated bentonite (Na/Ca type montmorillonite), sodium type hectorite, calcium type hectorite, sodium magnesium type hectorite (silicic acid (Na/Mg)), Aluminum-magnesium silicate (silicic acid (Al/Mg)) is preferable, and synthetic hectorite, synthetic saponite, or synthetic stevensite is more preferable. Commercially available products include Smecton-SWF, Smecton-SWN (synthetic hectorite manufactured by Kunimine Industry Co., Ltd.), product names: LAPONITE-RD, LAPONITE-XLG XR, LAPONITE-XL21, LAPONITE-S482 (Big Chemie Japan. Examples thereof include synthetic hectorite), but the invention is not limited thereto.

Examples of the mica group include those in which interlayer metal ions are isomorphically substituted with sodium ions or lithium ions by synthesis. For example, the isomorphic substitution type synthesized using teniolite (KMg ₂ Li(Si ₄ O ₁₀ )F ₂ ) as a starting material. Examples of synthetic mica are as follows. Specific examples of the mica group include sodium isomorphous substitutes of teniolite, and sodium-type fluorotetrasilicic acid mica which is a sodium isomorphous substitute of tetrafluorofluorine mica, and these have a remarkable infinite swelling property with water. Or it exhibits a limited swelling property.

All of the 2:1 type layered silicate minerals having metal ions between layers have a certain degree of cation exchange capacity, but have a high cation exchange capacity (CEC). It is desirable to select acid salt minerals. This utilizes the ion exchange property of interlayer metal ions in the intercalation for introducing the metal complex compound between the layers of the 2:1 type layered silicate mineral. Therefore, the higher the cation exchange capacity, the more efficient the metal complex compound is. This is because it can be well intercalated. Specifically, a 2:1 type layered silicate mineral in an aqueous solution of pH 9.0 to 12.0 in which a 2:1 type layered silicate mineral is dispersed in a range of 7.0% by mass to 18% by mass. The cation exchange capacity is 30 meq/100 g or more, and more preferably 60 meq/100 g or more. In addition, the 2:1 type layered silicate mineral exhibits swelling property in an aqueous liquid phase dispersion medium. That is, it is preferable to select a 2:1 type layered silicate mineral such as synthetic hectorite from the smectite group having a good cation exchange ability.

The content of the 2:1 type layered silicate mineral in the thixotropic agent of the present invention is preferably in the range of 7% by mass to 25% by mass. When the content of the 2:1 type layered silicate mineral is less than 7% by mass, the desired thixotropic property may not be exhibited. On the other hand, when the content of the 2:1 type layered silicate mineral exceeds 25% by mass, the negative charge on the surface of the 2:1 type layered silicate mineral and the polarized positive charge cause electrostatic interaction, resulting in 2 The type-1 layered silicate mineral may form a unique aggregate structure called a card house structure, and the dispersion may gel, making it difficult to obtain a uniform dispersion. The more preferable content of the 2:1 type layered silicate mineral in the thixotropic agent is in the range of 9% by mass or more and 18% by mass or less.

The water-soluble complexan type ligand in the present invention is crosslinked with a water-soluble polymer. The water-soluble Konpurekusan type ligands are bridged by a water-soluble polymer, as long as it is coordinated to the interlayer metal ion, e.g., ethylenediaminetetraacetic acid (EDTA) · 4H, EDTA2H · 2Na · 2H 2 O, _{EDTA · 3Na · 2H 2 O,} EDTA · 4Na · 4H 2 O, EDTA · 2H · 2K · 2H 2 O or the like of ethylenediaminetetraacetic acid, hydroxyethyl ethylenediamine triacetic acid _{(HEDTA) · 3Na · 2H 2} O, HEDTA · 3Na · 3H ₂ O, hydroxyethylethylenediamine triacetic acid such as HEDTA/3Na, diethylenetriaminepentaacetic acid (DTPA)/5H, diethylenetriaminepentaacetic acid such as DTPA/5Na, triethylenetetraminehexaacetic acid, 1,2,3-triaminopropanehexaacetic acid , 3-hydroxy-2-2-iminodisuccinate sodium, L-aspartic acid-NN-2 sodium acetate and the like. The molecular weight of the water-soluble complexan ligand is preferably 150 or more and 750 or less.

The water-soluble polymer used in the present invention may be any one that crosslinks the water-soluble complexan type ligand, and when the water-soluble complexan type ligand has a carboxyl group and/or a hydroxyl group, it is water-soluble. The polymer preferably has a carbodiimide group and/or an oxazoline group.

The carbodiimide group is a functional group represented by "-N=C=N-", and is known to react with active hydrogen and label or crosslink with a carboxyl group, an amino group, a hydroxyl group or the like by a highly versatile method. Has been. However, an intercalation compound in which a carboxyl group or a hydroxyl group of a complexan type ligand is reacted with a carbodiimide group is inserted between layers, and a thixotropic agent is generated by intercalation has not been disclosed so far. .. Examples of the water-soluble polymer having a carbodiimide group include water-soluble carbodiimide (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide:WSC) or a salt thereof, 1-cyclohexyl-3-(2-morpholinyl-4-). Ethyl)carbodiimide (CME-carbodiimide) or a salt thereof, dicyclohexylcarbodiimide (DCC) or a salt thereof, diisopropylcarbodiimide (DIC) or a salt thereof, and the like, and the salt compound includes 1-ethyl-3-(3-dimethylamino). Propyl)carbodiimide hydrochloride, 1-cyclohexyl-3-(2-morpholinyl-4-ethyl)carbodiimidometh-p-toluenesulfonate, etc. are included, but 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride It is particularly preferable to use a salt.

As the water-soluble polymer having an oxazoline group, a polymer having an oxazoline group is preferable, and a polymer formed by addition-polymerizing an oxazoline group-containing monomer alone or with another monomer is preferable. Examples of the addition-polymerizable oxazoline group-containing monomer include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-oxazoline, 2-isopropenyl-2-oxazoline, 2 -Isopropenyl-4-methyl-2-oxazoline, 2-isopropenyl-5-methyl-2-oxazoline, 2-2-bis2-oxazoline and the like can be mentioned, and a mixture of one or more of these can be used. Can be used. Among these, 2-isopropenyl-2-oxazoline is industrially easily available and suitable.

The other monomer is not limited as long as it is a monomer that can be polymerized with an addition-polymerized oxazoline group-containing monomer, and examples thereof include alkyl acrylate, alkyl methacrylate, and the like (as the alkyl group, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an isobutyl group). Acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, styrenesulfonic acid and salts thereof (sodium salt, n-butyl group, 2-ethylhexyl group, cyclohexyl group); Unsaturated carboxylic acids such as potassium salt, ammonium salt and tertiary amine salt), unsaturated nitriles such as acrylonitrile and methacrylonitrile, acrylamide, methacrylamide, N-acrylalkylamide, N-alkylmethacrylamide, Unsaturation such as N,N-dialkyl acrylamide, N,N-dialkyl methacrylate (as an alkyl group, methyl group, ethyl group, n-propyl group, isobutyl group, t-butyl group, 2-ethylhexyl group, cyclohexyl group) Amide groups; vinyl ester groups such as vinyl acetate and vinyl propionate, vinyl ether groups such as methyl vinyl ether and ethyl vinyl ether, and the like, and one or more of these monomers can be used.

Examples of commercially available water-soluble polymers having an oxazoline group using an acrylic monomer as another monomer include “Epocros WS-300” and “Epocros WS-” which are polymer-type cross-linking agents having an oxazoline group branched to an acrylic resin. 500" (all manufactured by Nippon Shokubai Co., Ltd.), NK Ringer FX (manufactured by Shin-Nakamura Chemical Co., Ltd.) and the like.

The reaction between a 2-oxazoline group and a carboxyl group is known, and it is known that an esteramide bond "-CONH-CR(R)-CR'(R")-OCO-" is produced by a ring-opening reaction of an oxazoline group. Has been. For example, JP-B-44-31821 discloses a method for producing a crosslinked resin by reacting a polymer having a carboxyl group in a side chain with a poly-2-oxazoline compound. In addition, Journal of Polymer Science, Polymer Chemistry Edition, Vol. 23, pp. 1805-1817 (1985) [Journal of Polymer Science: Polymer Chemistry Edition, Vol. 23, 1805-1817 (1985)], a method of crosslinking a copolymer containing pendant cyclic imino ether with a dicarboxylic acid is disclosed. However, a compound in which a carboxyl group of a complexan type ligand and an oxazoline group of a crosslinked water-soluble polymer are reacted is inserted between layers as an intercalation compound and a thixotropic agent is generated by intercalation has been disclosed so far. Not.

The thixotropic agent of the present invention may optionally contain a dispersant. Examples of the dispersant include sodium chloride, sodium ordolinate, sodium pyrophosphate, sodium tripolyphosphate, sodium tetraphosphate, sodium hexametaphosphate, sodium polyphosphate, sodium hydroxide, sodium silicate, polyethylene glycol, polypropylene glycol, humic acid. It is possible to use one kind or a combination of two or more kinds selected from the group consisting of sodium, sodium polymethacrylate, and ammonium polymethacrylate. The form of the dispersant such as solid and liquid is not particularly limited. By using the dispersant mentioned here, it is possible to prevent the mutual charge of the 2:1 type layered silicate mineral from being coagulated, and the layers are peeled off to ensure the fluidity of the mixed solution.

The amount of the dispersant added is preferably in the range of 5 parts by mass or more and 18 parts by mass or less with respect to 100 parts by mass of the 2:1 type layered silicate mineral. If the amount of the dispersant added is less than 5 parts by mass with respect to 100 parts by mass of the 2:1 type layered silicate mineral, the desired dispersion effect may not be obtained. On the other hand, if the amount of the dispersant added exceeds 18 parts by mass, excess ions may be present in the dispersion liquid, intercalation may not be performed properly, and ion reactivity may be hindered. In addition, when the amount of the dispersant added is large, layer delamination is favorably performed by preventing mutual coagulation of the electric charges of the 2:1 type layered silicate mineral, but the obtained thixotropic agent leaves the bed during the storage May not be able to maintain stability over time, and the thixotropic effect may not be continuously expressed.

If necessary, conventionally known additives may be added to the thixotropic agent of the present invention as long as the effects of the present invention are not impaired. Examples of such additives include pH adjusters, surfactants and preservatives.

(Preparation of liquid modified composition)
First, a water-soluble complexan-type ligand and a water-soluble polymer are added to a solvent such as water and stirred to obtain a water-soluble complexan-type ligand crosslinked with the water-soluble polymer. The temperature for stirring the aqueous solution is a freezing point or boiling point of the aqueous solution, preferably -5°C to 100°C, more preferably 0°C to 50°C. When the temperature of the aqueous solution is lower than -5°C, the reaction due to the cross-linking is difficult to proceed, and it becomes difficult to knead the whole system and to carry out the reaction in a uniform system state. On the other hand, when the temperature of the aqueous solution is 100° C. or higher, in the subsequent intercalation step, the 2:1 type layered silicate mineral exerts a swelling action in the dispersion medium, significantly thickens in the system, and It becomes difficult to make the reaction homogeneous.

Next, the cross-linked water-soluble complexan type ligand prepared above is added to a mixed solution in which a 2:1 type layered silicate mineral and a dispersant are mixed in a dispersion medium such as water. A water-soluble complexan type ligand is intercalated between layers of a 2:1 type layered silicate mineral. At this time, the mixed liquid may have any temperature in a normal temperature region, a low temperature region near 0° C., or a high temperature region near 100° C., and even if the temperature is kept at a predetermined temperature, the temperature adjustment is performed. It may not be performed. The reaction temperature for achieving the intercalation proceeds even in the normal temperature region, but it may be heated or heated to accelerate the reaction rate. The completion of the reaction between the layers can be determined by the appearance of the dispersion, change in viscosity, change in state such as formation of precipitate, and the like.

Use an analytical instrument to confirm the intercalation compound formed by intercalating the cross-linked water-soluble complexan type ligand molecule as the guest molecule into the 2:1 type layered silicate mineral as the host molecule. You can also check. For example, the obtained intercalation compound can be slowly dried in a thermostat or the like for 24 hours or more to obtain only solid content and powdered, and the obtained powder can be confirmed by X-ray diffraction (XRD). .. Since the interplanar distance obtained from the diffraction peak of the (001) plane appearing on the lowest angle side corresponds to the bottom distance (layer thickness+interlayer distance), a 2:1 type layered silicate mineral containing no guest molecule is used. The presence or absence of intercalation can be determined by comparing with the bottom surface spacing. It can be seen that when guest molecules are intercalated between the layers of the 2:1 layered silicate mineral, the diffraction peak of the crystal shifts to the lower angle side and the interlayer distance increases. From this, it can be confirmed that an intercalation compound is formed.

As a method for mixing the aqueous solution and the dispersion liquid in all the steps in the preparation of the thixotropic agent of the present invention, manual or mechanical treatment or ultrasonic treatment can be used, but mechanical stirring is preferable. For mechanical stirring, for example, a high pressure homogenizer, a paint shaker, a ball mill, a roll mill, a sand mill, a sand grinder, a propeller type agitator, a revolving revolution mixer, a disper, a homogenizer, a homomixer, a nano mixer, a ball mill, a kneader, a nanomizer, etc. are used. can do. One of these may be used alone, or two or more types of devices may be combined.

By adding the thixotropic agent according to the present invention to an object, good thixotropy exhibited by a 2:1 type layered silicate mineral such as viscosity for thickening, dispersibility for preventing sedimentation of dispersoids, thixotropy, etc. Various properties derived from sex can be imparted, and these properties can be stably maintained for a long period of time. Here, since the thixotropic agent itself has a high thixotropic property, even if the amount of the thixotropic agent added to the object is reduced, the viscosity and the like of the object can be improved. Furthermore, functions such as viscosity imparted by mechanical action such as shearing force applied during compounding (during mixing and mixing, stirring, etc.) do not deteriorate. In other words, the time to add the thixotropic agent to the target is the same viscosity whether it is before mechanical shear mixing or before dispersion, or after mechanical shear mixing or after dispersion. Functions such as can be expected. Furthermore, since the thixotropic agent of the present invention has high transparency, problems such as coloring of an object and generation of turbidity do not occur.

As described above, the thixotropic agent of the present invention is not easily affected by the properties of the object, and therefore, cosmetics, paints, toiletry products, quasi-drugs, water reducing agents for building materials, soil condition improving agents, sizing agents, and paper processing. It can be added to a wide range of objects such as sizing agents, and the thixotropy, dispersibility, viscosity or anti-settling property of these objects can be improved.

Specifically, the prepared thixotropic agent can be appropriately diluted and an additive can be added to adjust various preparations exhibiting the effect of the water-soluble thixotropic agent according to the purpose. The thixotropic agent is arbitrarily selected according to a preferred treatment method for cosmetics such as emulsified or solubilized. For example, in cosmetics suitable for use in preventing liquid odor, surfactants, pH adjusters, chelating agents, fragrances, liquid odor preventing active ingredients, ethanol, etc. are used as additive components other than water. It is preferable to add the thixotropic agent in the range of 3 to 5% by mass in terms of solid content. In such a case, the thixotropic agent may be pre-added or post-added to the preparation to be prepared. But there is no problem.

Example 1
To 200 mL of tap water (SP value: 23.4 cal/cm ³ ) in a 500 mL beaker, 2 g of sodium pyrophosphate was dissolved in 10 g of tap water, and 20 g of synthetic hectorite (2:1 type). A layered silicate mineral and Smecton-SWF (manufactured by Kunimine Industries Co., Ltd.) were sequentially added to prepare a mixed solution. This mixed solution was stirred at room temperature for 2 hours with a lab disper to sufficiently hydrate the synthetic hectorite.
To 10 g of purified water placed in another beaker, 1 g of sodium ethylenediamine hydroxyethyl triacetate dihydrate (water-soluble complexan type ligand, CHIREST HC-SD: manufactured by CREST) and an oxazoline group-containing polymer (WS -300: manufactured by Nippon Shokubai Co., Ltd.) and 2 g of the complex obtained as an active ingredient by adding 1 g were added dropwise to a beaker in which synthetic hectorite was hydrated at room temperature for 60 minutes for intercalation. It was After the addition of the complex was completed, a pH adjuster was added to adjust the pH to 10.0, the mixture was stirred at room temperature for 12 hours with a lab disper, and allowed to stand overnight at room temperature to obtain a thixotropic agent.

(Example 2)
To 200 mL of tap water (SP value: 23.4 cal/cm ³ ) placed in a 500 mL beaker, a dispersant containing 2.2 g of sodium pyrophosphate dissolved in 10 g of tap water and 20 g of synthetic hectorite (2: A type 1 layered silicate mineral, LAPONITE-XLG XR (manufactured by Big Chemie Japan) was sequentially added to prepare a mixed solution. The mixed solution was stirred at room temperature with a lab disper for 2 hours to sufficiently hydrate the synthetic hectorite.
To 10 g of purified water placed in another beaker, 1 g of diethylenetriaminepentaacetic acid (water-soluble complexan type ligand, CHIREST PA-SD: manufactured by CREST) and N,N'-dicyclohexylcarbodiimide (manufactured by Tokyo Kasei). 2 g of the complex obtained as an active ingredient by adding 1 g of the complex was added dropwise to a beaker in which synthetic hectorite was hydrated at 30° C. for 60 minutes for intercalation. After the addition of the complex was completed, a pH adjuster was added to adjust the pH to 10.0, the mixture was stirred at room temperature for 12 hours with a lab disper, and allowed to stand overnight at room temperature to obtain a thixotropic agent.

(Example 3)
To 200 mL of tap water (SP value: 23.4 cal/cm ³ ) put in a 500 mL beaker, 2.1 g of sodium pyrophosphate was dissolved in 10 g of tap water as a dispersant, and 20 g of synthetic hectorite (2: A type 1 layered silicate mineral, LAPONITE-RD (manufactured by Big Chemie Japan Co., Ltd.) was sequentially added to prepare a mixed solution. The mixture was stirred at room temperature for 2 hours with a lab disper to fully hydrate the synthetic hectorite.
To 10 g of purified water placed in another beaker, 1 g of triethylenetetramine hexaacetic acid (water-soluble complexan type ligand, TTHA: Dojindo Laboratories) and oxazoline group-containing polymer (WS-300: Nippon Shokubai) 2 g of the complex obtained as an active ingredient by adding 1 g of the complex) was added dropwise to a beaker in which synthetic hectorite was hydrated at room temperature for 60 minutes for intercalation. After the addition of the complex was completed, a pH adjuster was added to adjust the pH to 10.0, the mixture was stirred at room temperature for 12 hours with a lab disper, and allowed to stand overnight at room temperature to obtain a thixotropic agent.

(Comparative Example 1)
To 200 mL of ethyl acetate (SP value: 9.1 cal/cm ³ ) placed in a 500 mL beaker, 2.1 g of sodium pyrophosphate was dissolved in 10 g of tap water as a dispersant, and 20 g of synthetic hectorite (2: A type 1 layered silicate mineral and Smecton-SWF: manufactured by Kunimine Industries Co., Ltd.) were sequentially added to prepare a mixed solution. The mixture was stirred at room temperature for 2 hours with a lab disper to fully hydrate the synthetic hectorite.
To 10 g of purified water placed in another beaker, 1 g of sodium ethylenediaminehydroxyethyl triacetate dihydrate (water-soluble complexan type ligand, CHIREST HC-SD: manufactured by CREST) and an oxazoline group-containing polymer (WS- 300: manufactured by Nippon Shokubai Co., Ltd.) and 2 g of a complex obtained as an active ingredient by adding 1 g were added dropwise to a beaker in which synthetic hectorite was hydrated at room temperature for 60 minutes for intercalation. .. After the addition of the complex was completed, a pH adjuster was added to adjust the pH to 10.0, the mixture was stirred at room temperature for 12 hours with a lab disper, and allowed to stand overnight at room temperature to obtain a thixotropic agent.

(Comparative example 2)
To 200 mL of ethyl acetate (SP value: 9.1 cal/cm ³ ) placed in a 500 mL beaker, 2.1 g of sodium pyrophosphate was dissolved in 10 g of tap water as a dispersant, and 20 g of synthetic hectorite (2: A type 1 layered silicate mineral and Smecton-SWN (manufactured by Kunimine Industries Co., Ltd.) were sequentially added to prepare a mixed solution. The mixture was stirred at room temperature for 2 hours with a lab disper to fully hydrate the synthetic hectorite.
To 10 g of purified water placed in another beaker, 1 g of diethylenetriaminepentaacetic acid (water-soluble complexan ligand, CHIREST PA-SD: manufactured by CREST) and an oxazoline group-containing polymer (WS-300: manufactured by Nippon Shokubai Co., Ltd.) 2 g of the complex obtained as an active ingredient prepared by adding 1 g of the complex was added dropwise to a beaker in which synthetic hectorite was hydrated at 30° C. for 60 minutes for intercalation. After the addition of the complex was completed, a pH adjuster was added to adjust the pH to 10.0, the mixture was stirred at room temperature for 12 hours with a lab disper, and allowed to stand overnight at room temperature to obtain a thixotropic agent.

(Comparative example 3)
To 200 mL of acetone (SP value: 9.9 cal/cm ³ ) placed in a 500 mL beaker, 2.0 g of sodium pyrophosphate was dissolved in 10 g of tap water as a dispersant, and 20 g of synthetic stevensite (2: A type 1 layered silicate mineral and Smecton-ST: manufactured by Kunimine Industries Co., Ltd.) were sequentially added to prepare a mixed solution. The mixture was stirred at room temperature for 2 hours with a lab disper to fully hydrate the synthetic hectorite.
To 10 g of purified water placed in another beaker, 1 g of triethylenetetramine hexaacetic acid (water-soluble complexan type ligand, CHIREST QA: manufactured by CREST) and a polymer containing an oxazoline group (WS-300: manufactured by Nippon Shokubai Co., Ltd.) 2 g of the complex obtained as an active ingredient prepared by adding 1 g was added dropwise to a beaker in which synthetic hectorite was hydrated at room temperature for 60 minutes for intercalation. After the completion of dropwise addition of the complex, a pH adjuster was added to adjust the pH to 10.0, the mixture was stirred at room temperature for 6 hours with a lab disper, and allowed to stand overnight at room temperature to obtain a thixotropic agent.

(Viscosity evaluation method)
In the present specification, the thixotropic property and the thixotropic property refer to a property in which the apparent viscosity temporarily decreases due to deformation in an isothermal state, and specifically, the flow resistance (apparent viscosity) decreases as the flow velocity and shear stress increase. However, when the shear stress is reduced, the viscosity recovers, but it takes time to restore the viscosity, and a property of giving a phenomenon in which the fluidity has a hysteresis is recognized. This is a property in which a difference in viscosity appears depending on the measurement conditions of a viscometer used when measuring the viscosity. For example, the viscosity shown by measuring a shear pressure applied to a rotor or a cone by rotating a rotor or a cone, which is a measuring jig, in a sample as represented by a B type viscometer and an E type viscometer, In samples with thixotropic properties, they are shown differently depending on the rotor or cone rotation speed, with higher viscosity at low rotation speeds and lower viscosity at high rotation speeds. In this example, the ratio of the viscosity measured at 5 rpm and the viscosity measured at 50 rpm (5 rpm/50 rpm) was used as the evaluation of thixotropic characteristics. That is, the larger the 5 rpm/50 rpm, the better the thixotropic characteristics were evaluated.

(Viscosity measurement)
The thixotropic agents of Examples 1 to 3 and Comparative Examples 1 to 3 were allowed to stand at room temperature and stored for 1 week, and then E type viscometer (product name: TVE-25H: manufactured by Toki Sangyo Co., Ltd.) was used. , Viscosity and T.S. The I value (thixotropic index) was measured. The measurement procedure is as follows. The measurement results are shown in Table 1.
(1) Using a conical flat plate cone plate (1°34′×R24), measurement was performed at 5 rpm and 50 rpm. Set the plate temperature to measure the contents in the circulating constant temperature bath at 25°C, pre-share (100 rpm x 2 minutes + setting 2 minutes) with the measurement sample amount of 1.1 mL, and set the primary condition to adjust the measurement conditions. Viscosity was measured after structural destruction.
(2) T. The I value was represented by the value of 5 rpm viscosity/50 rpm viscosity of the viscosity obtained by the above viscosity measurement.

As is clear from Table 1, the liquid modified compositions of Examples 1 to 3 have T.I. The I value was 9.7 or more, indicating good thixotropy. On the other hand, the liquid modified compositions of Comparative Examples 1 to 3 could not calculate the thixotropy index (T.I value) because the viscosity of 5 prm and 50 rpm could not be measured.

Next, various compositions containing the thixotropic agents of Example 1 and Comparative Example 1 were respectively prepared, and the effect of the thixotropic agents in each composition was evaluated. The blending amount of each component shown in () is mass% unless otherwise specified.

(Viscous liquid odor prevention formulation)
The thixotropic agent of Example 1 (10.0), hydroxypropylmethylcellulose (0.4), cyclomethicone (2.0), PPG-15 stearyl (0.5), ethanol (20.0), chlorohydroxyaluminum. (15.0), EDTA (0.1), fragrance (0.1), preservative (appropriate amount) and purified water (the balance) were mixed according to a conventional method to prepare a viscous liquid odor inhibitor. The viscous liquid odor inhibitors of Examples have better storage stability, stickiness, and a lighter finish than the viscous liquid odor inhibitors added with Comparative Example 1 similarly formulated, and especially at low temperatures. And in the high temperature storage stability, the viscous liquid odor inhibitor of Example has no discoloration, and the stability can be ensured without the occurrence of water separation and bed separation, but the viscous liquid odor inhibitor of Comparative Example turns reddish brown, Water separation and bed separation occurred.

(Sunscreen formulation)
Fine particle titanium oxide (8.0), acrylic silicone-based kraft copolymer (4.0), thixotropic agent (15.0) of Example 1, polyether-modified silicone (2.0), ethanol (20.0). ) A sunscreen agent was prepared by uniformly mixing and dispersing each component of an ultraviolet absorber (suitable amount) and decamethylcyclopentasiloxane (suitable amount). The sunscreen preparation of Example 1 has better long-term stability than the sunscreen preparation of Comparative Example 1 added, has good elongation on the skin, and gives a moist feel to the skin. It was The sunscreen formulation to which Comparative Example 1 was added was slightly colored reddish brown and had a slight odor, and the gloss and the feeling during use were inferior to those of the examples.

(Deodorant water spray formulation)
Silicone resin powder (1.5), benzalkonium chloride (0.1), stearyl trimethyl ammonium chloride (0.3), POE60 hydrogenated oil (0.01), zinc paraphenol sulfonate (0.1), ?-Menthol (0.1), IPMP (0.1), clara extract (0.1), ?-arginine (0.001), fragrance (0.1), ethanol (30), shake of Example 1 Each component of the modifier (18) and purified water (residual) was uniformly mixed and dispersed to prepare a deodorant water spray agent. The deodorant water spray agent prepared in Example 1 has better long-term stability than the deodorant water spray agent prepared in Comparative Example 1 (the same addition amount used in Example 1) and has good thixotropy on the skin. It was well expressed, had no sticky feeling, and had excellent elongation, and gave a moist feel to the skin. In addition, the deodorant water spray agent to which Comparative Example 1 was added had a slight odor, and was inferior to the Examples in gloss and feel during drying.

(Water-based paint pigment settling agent)
40.2 parts of a water-soluble acrylic resin having a solid content of 41.5% (trade name "Watersol S-701", manufactured by Dainippon Ink and Chemicals, Inc.), 8 parts of butyl cellosolve, and 71.8 parts of ion-exchanged water. After thorough mixing, a clear paint (total 120 parts) was obtained. Next, with respect to 120 parts of this clear paint, 3 parts (solid content) of the thixotropic agent of the above-mentioned Example 1 as an anti-settling agent composition, and synthetic smectite (trade name "Smecton-SWF", as a comparison product thereof, 3 parts (solid matter) manufactured by Kunimine Industries Co., Ltd. and 6 parts of a pearl pigment having a particle size of 5 to 100 μm (trade name “Iriodin 103”, manufactured by Merck) were mixed to obtain a water-based paint. The anti-sedimentation performance of the pearl pigment in this paint was confirmed.
In the synthetic smectite (trade name "Smecton-SWF", manufactured by Kunimine Industries Co., Ltd.) added as a comparison product, the pearl pigment in the coating solvent after 5 days was settled by 10 cm or more from the day 0 after the start of the addition test. The water-based paint containing the thixotropic agent of Example 1 did not settle in the paint solvent even after 5 days, 10 days, and 30 days, and the pearlescent pigment did not change after 0 days from the start of the addition test, and exhibited anti-settling performance. I was able to judge that it is being done.

(Colorant settling agent for water-based ballpoint pens)
FUJI SP Red 5544 (red aqueous pigment base, manufactured by Fuji Color Co., Ltd.) 18.0 parts by mass, FUJI SP Yellow 4178 (yellow aqueous pigment base, manufactured by Fuji Color Co., Ltd.) 5.0 parts by mass, glycerin 17.0. Parts by mass, ethylene glycol 23.0 parts by mass, benzotriazole 0.3 parts by mass, Proxel GXL(S) 0.2 parts by mass, ion-exchanged water 31.5 parts by mass, Example 1 additive 2.0 parts by mass. , 2.0 parts by mass of succinic acid, Example 1 in the above components, the other components except succinic acid were put in a stirrer and mixed and stirred for 1 hour, then, coarse particles were removed, and the shaking of Example 1 was performed. After adding the agent and succinic acid, mixing and stirring, and filtering, an aqueous ink composition for a ballpoint pen was obtained. The aqueous ink composition for a ball-point pen mixed with the thixotropic agent of Example 1 has a stable ink viscosity even after being stored for a long period of time and can prevent sedimentation of a colorant and the like. Therefore, even if the pen tip is left facing downward after forming the ballpoint pen, it is possible to prevent blurring of the handwriting and inability to write on the pen tip due to sedimentation of the coloring agent or the like. From this, it was determined that the thixotropic agent of Example 1 exhibited the anti-settling property of the colorant.

The thixotropic agent of the present invention is useful because it can impart good thixotropy to an object.

Claims (7)

A thixotropic agent in which a 2:1 type layered silicate mineral having metal ions between layers is dispersed in a dispersion medium,
The Hansen solubility parameter (SP value) of the dispersion medium is 10 cal/cm ³ or more,
A thixotropic agent, wherein a water-soluble complexan type ligand cross-linked with a water-soluble polymer is coordinated with the metal ion. The water-soluble polymer has a carbodiimide group and/or an oxazoline group,
The thixotropic agent according to claim 1, wherein the water-soluble complexan type ligand has a carboxyl group and/or a hydroxyl group. The thixotropic agent according to claim 1 or 2, wherein the metal ion is an alkali metal ion and/or an alkaline earth metal ion. The thixotropic agent according to any one of claims 1 to 3, wherein a layer charge of the 2:1 layered silicate mineral is 0.2 or more and 0.9 or less. The thixotropic agent according to any one of claims 1 to 4, wherein the content of the 2:1 layered silicate mineral is 7% by mass or more and 25% by mass or less. The dispersion medium is cyclohexanol, n-butanol, isopropyl alcohol, dimethylformamide, ethanol, methanol, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, polypropylene glycol, glycenol, formamide, N-. The thixotropic agent according to any one of claims 1 to 5, which is a single selected from the group consisting of methyl-2pyrrolidone and water or a combination of two or more thereof. The thixotropic agent according to any one of claims 1 to 6, wherein the water-soluble complexan ligand has a molecular weight of 150 or more and 750 or less.