JP6617252B1 - Leather maintenance agent and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leather maintenance agent and a method for producing the same, which are easy to apply to leather products and easy for consumers to handle. SOLUTION: This is a leather maintenance agent containing silicone oil, glycerin and water, wherein the content of the silicone oil is 0.5 to 15.0% by mass, and the content of the glycerin is 5% by mass. 0.0 to 30.0% by mass, and the content of water is 45.0 to 94.0% by mass. A method for producing a leather maintenance agent, comprising a mixing step of mixing a silicone emulsion, glycerin, and dilution water, wherein in the mixing step, the content of the silicone emulsion in the total amount of the leather maintenance agent In which the content of the glycerin is 5.0-30.0% by mass, and the content of the dilution water is 40.0-90.0% by mass. Method. [Selection diagram] None

Description

  The present invention relates to a leather maintenance agent and a method for producing the same.

When leather products are used continuously, they harden or cracks due to drying. Therefore, in order to use leather products for a long time, it is necessary to carry out daily maintenance (maintenance).
As a maintenance agent for leather products, animal waxes such as beeswax and whale wax, plant waxes such as carnauba wax, petroleum waxes such as paraffin wax and microcrystalline wax, mineral waxes such as montan wax, and Hoechst wax are synthesized. Known are animal and plant oils such as wax, mink oil, coconut oil, and the like, and combinations thereof, and those composed mainly of only oil (for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 2001-311052 JP-A-10-237389

However, oil-based maintenance agents such as wax are difficult to handle and must be used while controlling the temperature, and there are problems that application unevenness is likely to occur depending on the state and type of the leather product when it is not used. In addition, there is a problem that white crystals may be formed on the surface of the leather product after maintenance due to overcoating.
Some maintenance agents are cream type. It is said that general leather products are not good for washing with water, or have an impression of being damaged when wet. For this reason, the cream type also contains wax and oil, and many of them have a large proportion of oil, and there is a problem that uneven coating tends to occur as in the case of wax.
In addition, the oil-based maintenance agent does not easily penetrate into leather products, and there are cases where the finished product such as the product after the maintenance is hard or sticky.
Thus, the conventional maintenance agent is difficult for consumers to handle.

  Under such circumstances, an object of the present invention is to provide a leather maintenance agent and a method for producing the same that are easy to apply to leather products and are easy for consumers to handle.

  As a result of intensive studies to solve the above problems, the present inventor has found that the following inventions meet the above object, and have reached the present invention.

That is, the present invention relates to the following invention.
<1> A leather maintenance agent comprising silicone oil, glycerin, and water, wherein the silicone oil content is 0.5 to 15.0 mass%, and the glycerin content is 5. A leather maintenance agent having a water content of 0 to 30.0 mass% and a water content of 45.0 to 94.0 mass%.
<2> The leather maintenance agent according to <1>, which contains a surfactant.
<3> The leather maintenance agent according to <2>, comprising the silicone oil, the glycerin, the water, and the surfactant.
<4> The leather maintenance agent according to <1> or <2>, including a greasing agent.
<5> The leather maintenance agent according to <4>, including the silicone oil, the glycerin, the water, the surfactant, and the greasing agent.
<6> A method for producing a leather maintenance agent comprising silicone oil, glycerin, and water, wherein the oil-in-water silicone emulsion in which the silicone oil is dispersed in an aqueous dispersion medium, the glycerin, and dilution water In the mixing step, the silicone emulsion content in the total amount of the leather maintenance agent is 5.0 to 30.0% by mass, and the glycerin content is 5.0. The manufacturing method which mixes so that content of -30.0 mass% and the said dilution water may be 40.0-90.0 mass%.

ADVANTAGE OF THE INVENTION According to this invention, the maintenance agent for leathers which it is easy to apply to a leather product and is easy to handle for consumers, and its manufacturing method are provided.
In addition, by using the leather maintenance agent of the present invention, the finish such as softness and smoothness of the leather can be made excellent.

  DESCRIPTION OF EMBODIMENTS Embodiments of the present invention will be described in detail below. However, the description of constituent elements described below is an example (representative example) of an embodiment of the present invention, and the present invention will be described below unless the gist thereof is changed. It is not limited to the contents. In addition, when using the expression “to” in this specification, it is used as an expression including numerical values before and after that.

[Leather maintenance agent of the present invention]
The present invention is a leather maintenance agent comprising silicone oil, glycerin and water, wherein the silicone oil content is 0.5 to 15.0% by mass, and the glycerin content is 5 The leather maintenance agent (hereinafter, the leather maintenance agent of the present invention) having a water content of 45.0 to 94.0% by mass may be described. .)

  As described above, leather products have an impression that they are easily damaged when wet, and generally, a maintenance agent for leather is composed of oil or has a very high ratio of oil. However, the present inventors have increased the proportion of water to a composition close to that of the leather component, and by further using water, silicone oil, and glycerin, the permeability to the leather and the moisture retention can be improved, I found out that it can be finished in good condition.

  The leather maintenance agent of the present invention is a liquid composition containing silicone oil, glycerin, and water in the above proportions and having the highest proportion of water among the constituent components. Because of such a configuration, it is easy to apply uniformly to the product.

  Further, by containing glycerin and water, the permeability of the maintenance agent into the leather and the moisture retention of the leather are enhanced. Glycerin and water penetrate into the leather and are retained inside the leather, so that the softness and moisture of the leather in the finish after use can be made excellent. Moreover, the stickiness of the leather product after use can be suppressed, and the smoothness of the surface can be improved.

  Moreover, since the surface of the leather is protected by the silicone oil, volatilization of the permeated maintenance agent is suppressed, so that the leather can be kept in a good state for a long time by using the leather maintenance agent of the present invention. .

Further, by using the leather maintenance agent of the present invention, light stains on leather products can be removed.
Thus, by using the leather maintenance agent of the present invention for leather products, the softness and smoothness of the leather products that have become harder due to daily use can be improved and recovered, or the leather products can be made difficult to deteriorate. .

  Also, depending on the leather product, the maintenance agent of the present invention penetrates into the inside of the leather, so that the dye contained in the leather moves to the surface of the leather, and the effect of color return is exhibited or the antifouling property is improved. be able to. Thereby, the color of the leather faded by use can be brought close to the color of the leather when not in use.

(Silicone oil)
The leather maintenance agent of the present invention contains silicone oil. Silicone oil mainly has the effect of improving the softness and smoothness of the surface of the leather product, and confine the leather maintenance agent of the present invention inside the leather product to suppress volatilization of the maintenance agent (especially water) of the present invention. It also has an effect. It also contributes to improving the antifouling properties of leather products.

  The content of the silicone oil in the leather maintenance agent of the present invention (mass of silicone oil / mass of the leather maintenance agent of the present invention × 100 (%)) is 0.5 to 15.0 mass%. When the content of silicone oil is less than 0.5% by mass, the effect of improving the softness and smoothness of the leather surface becomes insufficient, and the effect of improving the antifouling property of the leather also decreases. In addition, the leather maintenance agent easily evaporates from the leather, and it is difficult to keep the leather in a good condition for a long time. In order to improve the softness and smoothness of the leather surface and to keep the leather in a good condition for a longer time, the content of silicone oil is preferably 0.7% by mass or more, and 0.8% by mass. % Or more is more preferable. Moreover, it is good also as 1.0 mass% or more, 2.0 mass% or more, 3.0 mass% or more etc. according to the presence or absence of other additives. On the other hand, when the content of the silicone oil is more than 15.0% by mass, the content of glycerin and water is relatively reduced, and it is difficult to finish the whole leather softly. In order to further improve the softness and smoothness of the leather in the finish, the content of silicone oil is preferably 12.5% by mass or less, more preferably 11.5% by mass or less, and 10.0% by mass or less. Further preferred.

As the silicone oil, dimethylpolysiloxane or organically modified polysiloxane in which an organic group is introduced into the terminal (both or one terminal) or side chain of dimethylpolysiloxane can be used.
A preferred silicone oil is an organically modified polysiloxane. Examples of organically modified polysiloxanes include polyether-modified polysiloxanes having polyether groups introduced into the ends and side chains of dimethylpolysiloxane, and amino-modified polysiloxanes having amino groups introduced into the ends and side chains of dimethylpolysiloxane. be able to.

(Glycerin)
The leather maintenance agent of the present invention contains glycerin. Glycerin mainly has the effect of improving the softness of leather products by increasing the penetration and moisture retention properties of the leather maintenance agent of the present invention into the leather, together with water.

  The content of glycerin in the maintenance agent for leather of the present invention (mass of glycerin / mass of the maintenance agent for leather of the present invention × 100 (%)) is 5.0 to 30.0 mass%. When the content of glycerin is less than 5.0% by mass, the leather maintenance agent does not easily penetrate into the leather, and the softness of the leather in the finish becomes insufficient. In order to further enhance the permeability of the leather maintenance agent, exert a sufficient moisturizing effect on the leather, and make the leather more flexible, the content of glycerin is preferably 7.0% by mass or more, 8.0 mass% or more is more preferable. On the other hand, if the glycerin content is more than 30.0 mass, the leather tends to remain sticky, the surface of the leather is easily soiled, and it takes a long time to dry the leather maintenance agent. In order to obtain a finish with less stickiness, the content of glycerin is preferably 25.0% by mass or less, and more preferably 23.0% by mass or less.

  Moreover, 0.1-0.6 are preferable and, as for the mass ratio (mass of silicone oil / mass of glycerol) of silicone oil with respect to glycerol, 0.15-0.5 are more preferable. By setting it as such a mass ratio, the stickiness of the leather surface is suppressed and the finish (smoothness and flexibility) can be improved.

  Examples of glycerin that can be used in the leather maintenance agent of the present invention include purified glycerin and concentrated glycerin.

(water)
The leather maintenance agent of the present invention contains water. Water, together with glycerin, has the effect of enhancing the penetration and moisture retention of the leather maintenance agent of the present invention into the leather and improving the softness of the leather product. Furthermore, the leather maintenance agent of the present invention also has an effect of reducing stickiness after drying.

  The content of water in the leather maintenance agent of the present invention (mass of water / mass of the leather maintenance agent of the present invention × 100 (%)) is 45.0 to 94.0% by mass. When the water content is less than 45.0% by mass, the leather maintenance agent does not easily penetrate into the leather, resulting in insufficient softness in the finish, or stickiness on the leather. In order to further increase the permeability of the maintenance agent for leather and make the leather have a softer finish, the water content is preferably 50.0% by mass or more, and more preferably 60.0% by mass or more. Further, when the water content is more than 94.0 mass, the content of silicone oil and glycerin is relatively reduced, so that the moisturizing effect on the leather is lowered and the maintenance agent of the present invention is easily volatilized. , The softness in the finish is insufficient, and the leather is liable to deteriorate. In order to exert a sufficient moisturizing effect on the leather and make the leather have a softer finish, the water content is preferably 90.0% by mass or less, more preferably 88.0% by mass or less.

  Moreover, 1.5-15 are preferable and, as for mass ratio (mass of water / mass of glycerol) of water with respect to glycerol, 2-10 are more preferable. By setting it as such mass ratio, stickiness of the leather surface can be suppressed and the finish (smoothness and flexibility) can be improved while improving the permeability of the leather maintenance agent into the leather.

  The water is not particularly limited, and examples thereof include clean water, well water, ion exchange water, distilled water, and ultrapure water.

  The leather maintenance agent of the present invention is composed mainly of silicone oil, glycerin and water. For example, the total content of silicone oil, glycerin and water in the total amount of the maintenance agent for leather of the present invention ((mass of silicone oil + mass of glycerin + mass of water) / mass of the maintenance agent for leather of the present invention × 100 (%)) may be 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more.

  The leather maintenance agent of the present invention may contain other components other than silicone oil, glycerin and water. Examples of other components that can be included in the leather maintenance agent of the present invention include surfactants, greasing agents, preservatives, stabilizers, and pH adjusters. Especially, it is preferable that the maintenance agent for leather of this invention contains surfactant and a greasing agent in addition to silicone oil, glycerin, and water.

(Surfactant)
The leather maintenance agent of the present invention preferably contains a surfactant. By including the surfactant, the dispersion stability of the silicone oil in the maintenance agent is improved.

  The content of the surfactant in the leather maintenance agent of the present invention (mass of surfactant / mass of the leather maintenance agent of the present invention × 100 (%)) is not particularly limited as long as the silicone oil can be stably dispersed. For example, it can be 0.01% by mass or more, or 0.1% by mass or more. Moreover, the upper limit is not specifically limited, either, For example, it is 5 mass% or less, 2.5 mass% or less, 2 mass% or less, and 1 mass% or less.

  The surfactant that can be used in the leather maintenance agent of the present invention may be any of an anionic surfactant, a cationic surfactant, and a nonionic surfactant, and is appropriately determined depending on the type of silicone oil. The surfactant is preferably a nonionic surfactant, although it depends on the type of silicone oil. As described above, the leather maintenance agent of the present invention may contain a greasing agent, but the greasing agent is often anionic. Even in such a case, the dispersibility of the silicone oil is hardly affected by using the nonionic surfactant.

  Nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxypropylene polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene polyoxypropylene glycol, polyoxyethylene glycerin. Fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyethylene glycol fatty acid ester, fatty acid monoglyceride, polyglycerin fatty acid ester, propylene glycol fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyethylene alkyl ester, etc. Is mentioned.

  Among these, ether type nonionic surfactants are preferable, and polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxypropylene polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, and polyoxyethylene One or more nonionic surfactants selected from the group consisting of polyoxypropylene glycol are preferred.

  Stabilizers and preservatives can cause leather degradation. By using a composition that does not contain a stabilizer or preservative, the use of the leather maintenance agent of the present invention makes it easier to maintain the leather in good condition for a long time. Therefore, one of the preferable embodiments of the leather maintenance agent of the present invention is a leather maintenance agent (a) comprising silicone oil, glycerin, water, and a surfactant. The leather maintenance agent (a) is in the form of a dispersion in which silicone oil is dispersed in a solvent composed of water and glycerin.

By using silicone oil, glycerin, water, and a surfactant, the surface of the used leather product is less likely to cause stains due to leather maintenance agents. Color irregularities are unlikely to occur) and can be used by ordinary consumers who do not have specialized knowledge and skills for routine maintenance.
For example, leather products dyed with dyes tend to be more likely to cause stains due to maintenance agents than leather products dyed with pigments. The leather maintenance agent (a) has a high moisture content and is easy to infiltrate silicone oil and glycerin uniformly into leather products, so that even when used for leather products dyed with dyes, stains are unlikely to occur. Therefore, it can be suitably used for maintenance of various leather products such as undyed leather products, leather products dyed with pigments, and leather products dyed with dyes.

The leather maintenance agent (a) has a silicone oil content of 0.7 to 12.5 mass%, a glycerin content of 7.0 to 25.0 mass%, and a water content of 60. It is preferable that it is 0-92.0 mass%. More preferably, the silicone oil content is 1.0 to 12.5% by mass, the glycerin content is 10.0 to 25.0% by mass, and the water content is 60.0 to 88.0. % By mass. More preferably, the silicone oil content is 1.5 to 11.5 mass%, the glycerin content is 15.0 to 23.0 mass%, and the water content is 63.0 to 83.0. % By mass.
Moreover, 2-13 are preferable, as for the mass ratio of the water with respect to glycerol, 2-8 are more preferable, and 2.5-6 are more preferable.

(Greasing agent)
The leather maintenance agent of the present invention may contain a greasing agent. The greasing agent enhances the holding power of the leather's silicone oil and glycerin, making it difficult for oil to escape from the leather, making it possible to finish the leather softer. As a result, even harder and harder leather can be finished softly.

  Examples of the greasing agent that can be used in the leather maintenance agent of the present invention include anionic greasing agents such as a sulfonic acid greasing agent, a sulfuric acid greasing agent, a sulfite greasing agent, and a phosphoric acid greasing agent. And a cationic greasing agent such as an alkylamine-based greasing agent. One suitable greasing agent is a sulfonic acid greasing agent. Examples of sulfonic acid-based greasing agents include sulfonates such as linear alkylbenzene sulfonates, α-olefin sulfonates, α-sulfo fatty acid alkyl ester salts, and sulfonates and base oils (natural oils and synthetic oils). Examples thereof include greasing agents.

When the leather maintenance agent of the present invention contains a greasing agent, the silicone oil content is 0.5 to 10.0% by mass, and the glycerin content is 5.0 to 20.0% by mass. Yes, the water content is preferably 45.0 to 89.0% by mass, and the greasing agent content is preferably 5.0 to 20.0% by mass. More preferably, the content of silicone oil is 0.7 to 7.5% by mass, the content of glycerin is 7.0 to 15.0% by mass, and the content of water is 60.0. It is -85.0 mass% and content of a greasing agent is 7.0-15.0 mass%. More preferably, the content of silicone oil is 0.8 to 6.5% by mass, the content of glycerin is 8.0 to 13.0% by mass, and the content of water is 65.0. It is -83.0 mass%, content of a greasing agent is 8.0-13.0 mass% Moreover, 2-15 are preferable and, as for the mass ratio of the water with respect to glycerol, 4-12 are more preferable. 5 to 10 are more preferable.

  If the content of the greasing agent in the leather maintenance agent of the present invention (mass of the greasing agent / mass of the leather maintenance agent of the present invention × 100 (%)) is too small, the silicone oil or glycerin of the leather is retained. The effect on power improvement is reduced. Therefore, the content of the greasing agent in the leather maintenance agent of the present invention is preferably 5.0% by mass or more, more preferably 7.0% by mass or more, and further preferably 8.0% by mass or more. In addition, if the content of the greasing agent in the leather maintenance agent of the present invention is too much, the ratio of silicone oil, glycerin, water, etc. is relatively reduced, so the effect of the greasing agent is less likely to be exhibited. As a result, the softness and smoothness of the leather in the finish tends to be insufficient. Therefore, 20.0 mass% or less is preferable, as for content of the greasing agent in the maintenance agent for leathers of this invention, 15.0 mass% or less is more preferable, and 13.0 mass% or less is further more preferable.

  When the leather maintenance agent of the present invention contains a greasing agent, the mass ratio of glycerin to the greasing agent (mass of glycerin / mass of the greasing agent) is preferably 0.7 to 1.3. 8-1.2 is more preferable. Moreover, 0.1-0.6 are preferable and, as for mass ratio of the silicone oil with respect to a greasing agent (mass of silicone oil / mass of a greasing agent), 0.15-0.5 are more preferable. By using this mass ratio, the leather oil and glycerin holding power of the leather is improved by the greasing agent, and the softness of the leather is improved by the silicone oil and glycerin. (Sheath flexibility) can be improved. In addition, a well-finished state can be maintained for a longer time.

  Also, as mentioned above, since stabilizers and preservatives may cause leather deterioration, one of the preferred embodiments of the leather maintenance agent of the present invention is silicone oil, glycerin, water, and surfactant. And a leather maintenance agent (b) comprising a greasing agent. The leather maintenance agent (b) is in the form of a dispersion in which silicone oil and a greasing agent are dispersed in a solvent composed of water and glycerin.

(How to use the maintenance agent for leather of the present invention)
The leather maintenance agent of the present invention can be used for the maintenance (maintenance) of new and used leather products. Since the maintenance agent for leather of the present invention is liquid and has low viscosity, it can be easily applied uniformly to the surface of the leather product.
The leather maintenance agent of this invention can be used by apply | coating to a leather product using cloth, a brush, etc. The leather product is wiped with a cloth soaked with an appropriate amount of the leather maintenance agent of the present invention and soaked into the leather, or the leather maintenance agent of the present invention is applied onto the surface of the leather product and spread evenly with the cloth. It can be used. Moreover, in order to apply | coat to fur and a big leather product more uniformly, you may put the maintenance agent for leathers of this invention in containers, such as a spray, and spray it on leather products.

  Moreover, a leather product can also be immersed in the leather maintenance agent of this invention. When the leather product is immersed, if the immersion time is too long, the leather product expands and is liable to cause cracking after drying. Therefore, a few minutes to several tens of minutes (for example, 5 to 20 minutes) is sufficient.

Examples of the leather to be used for the leather maintenance agent of the present invention include natural leather such as cow, sheep, goat, pig, deer, crocodile, snake, and shark. These may be Nume leather, oil leather, suede, shrink leather, nubuck, enamel leather, leather with silver, glass leather and the like. Further, synthetic leather or artificial leather may be used.
Specific products include clothes such as coats, jumpers, jackets, gloves, shoes such as boots and pumps, miscellaneous goods such as bags and wallets, furniture such as chairs and sofas, and the like.

  Even if it is a structure like said leather maintenance agent (a) and leather maintenance agent (b), it can be used for 1-3 years.

[Manufacturing method of leather maintenance agent]
The present invention is a method for producing a leather maintenance agent comprising silicone oil, glycerin, and water, wherein the silicone oil is dispersed in an aqueous dispersion medium in an oil-in-water silicone emulsion, the glycerin, and dilution It can be related to a production method having a mixing step of mixing with water (hereinafter sometimes referred to as “the production method of the present invention”).

By using an oil-in-water silicone emulsion in which silicone oil is dispersed, a leather coating agent in which silicone oil is stably dispersed can be easily obtained.
Since a surfactant is usually used to disperse silicone oil in a silicone emulsion, a leather containing silicone oil, glycerin, water, and a surfactant can be obtained by the production method of the present invention. The coating agent can be easily produced.

In the mixing step, the mixing ratio of the silicone emulsion, glycerin, and dilution water is appropriately determined depending on the composition of the silicone emulsion and the presence or absence of other additives. In the total amount, the silicone emulsion content is 5.0-30.0 mass%, the glycerin content is 5.0-30.0 mass%, and the dilution water content is 40.0-90.0. It is preferable to mix so that it may become mass%.
Such a production method is particularly suitable as a production method of the leather maintenance agent of the present invention. In this case, the water of the leather maintenance agent of the present invention comprises an aqueous dispersion medium and dilution water.

(Oil-in-water silicone emulsion)
In the oil-in-water type silicone emulsion, silicone oil is dispersed in an aqueous dispersion medium, the dispersoid is silicone oil, and the aqueous dispersion medium is water.
A typical oil-in-water silicone emulsion mixes water, silicone oil, and surfactant to form surfactant micelles that incorporate silicone oil inside, thereby dispersing silicone oil in water. ing.

Examples of the silicone oil contained in the silicone emulsion include the above-described silicone oil, and an organically modified polysiloxane is preferable.
Moreover, said surfactant is mentioned as surfactant contained in a silicone emulsion, It is preferable that it is a nonionic surfactant.
The content of the silicone oil in the silicone emulsion (the mass of the silicone oil / the mass of the silicone emulsion × 100 (%)) is not particularly limited, and is, for example, 10.0 to 65.0 mass% or 10.0 to 50. 0.0% by mass, and 20.0-40.0% by mass.
The particle size of the silicone oil droplets in the silicone emulsion is not particularly limited, and may be, for example, 0.05 to 0.3 μm or 0.1 to 0.2 μm.

  Specifically, as a silicone emulsion, Kyoeisha Chemical's Light Silicone A-500, Light Silicone A-544, Shin-Etsu Chemical's POLON-MF-14, POLON-MF-14E, POLON-MF-51, POLON-MF -14EC, KM-9771, FZ-4634, FZ-4658, SM-8709, etc. manufactured by Dow Toray can be used.

  As the glycerin and dilution water used in the production method of the present invention, the same glycerin and water contained in the leather maintenance agent of the present invention can be used.

[Mixing process]
The mixing step is a step of mixing an oil-in-water silicone emulsion in which silicone oil is dispersed in an aqueous dispersion medium, glycerin, and diluted water.

  The obtained leather maintenance agent is composed mainly of a silicone emulsion, glycerin and dilution water. For example, the total content of the silicone emulsion, glycerin and dilution water ((mass of silicone emulsion + mass of glycerin + mass of dilution water) / mass of maintenance agent for leather × 100 (total amount of the maintenance agent for leather obtained) %)) Can be 50% by mass or more, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, and the like.

  The mixing ratio of the silicone emulsion, glycerin, and dilution water depends on the type of leather product to be used, taking into consideration the permeation and moisturizing effect of the resulting leather maintenance agent on leather and the difficulty of volatilization. It is determined appropriately depending on the composition of the silicone emulsion, the presence or absence of other components, and the like.

In order to further enhance the permeability of the resulting leather maintenance agent into leather, the mixing step is preferably such that the mass ratio of dilution water to glycerin (mass of dilution water / mass of glycerin) is 1.5 to 15. 10 is more preferable.
Further, in order to obtain a leather maintenance agent that can make the leather softer, smoother and less sticky, the mass ratio of silicone emulsion to glycerin (mass of silicone emulsion / mass of glycerin) is 0. 0.7 to 1.3 is preferable, and 0.8 to 1.2 is more preferable.

  In the mixing step, the content of the silicone emulsion in the obtained leather maintenance agent (mass of silicone emulsion / mass of leather maintenance agent × 100 (%)) is 5.0 to 30.0 mass%. It is preferable to mix so that it may become 7.0-25.0 mass%, it is more preferable to mix so that it may become 8.0-23.0 mass%, and it is further more preferable to mix.

  The mixing step is performed so that the glycerin content (mass of glycerin / mass of the leather maintenance agent × 100 (%)) in the obtained leather maintenance agent is 5.0 to 30.0 mass%. It is preferable to mix, it is more preferable to mix so that it may become 7.0-25.0 mass%, and it is further more preferable to mix so that it may become 8.0-23.0 mass%.

  In addition, in the mixing step, the content of dilution water in the obtained leather maintenance agent (mass of dilution water / mass of leather maintenance agent × 100 (%)) is 40.0 to 90.0 mass%. It is preferable to mix so that it may become 50.0-86.0 mass%, It is more preferable to mix so that it may become 54.0-84.0 mass%, It is further more preferable to mix.

The mixing order of the silicone emulsion, glycerin and dilution water in the mixing step is not particularly limited, and the silicone emulsion and glycerin mixture may be mixed with the dilution water, or the silicone emulsion and the dilution water mixture. Further, glycerin may be mixed, or a mixture of glycerin and dilution water may be mixed with a silicone emulsion.
Further, in the mixing step, in addition to the silicone emulsion, glycerin, and dilution water, the above-described other components such as a greasing agent may be mixed.

  On the other hand, as described above, stabilizers and preservatives may cause leather deterioration. Therefore, in the mixing step, the silicone oil, the glycerin, and the glycerin are mixed by mixing an oil-in-water type silicone emulsion in which silicone oil is dispersed in an aqueous dispersion medium with a surfactant, glycerin, and dilution water. It is preferable to use the mixing step (a) for obtaining a mixed liquid composed of an aqueous dispersion medium, the dilution water, and the surfactant. The manufacturing method which has a mixing process (a) is a suitable manufacturing method of the maintenance agent for leathers (a). In this case, the water for the leather maintenance agent (a) comprises an aqueous dispersion medium and dilution water.

The mixing step (a) is preferably mixed so that the content of the silicone emulsion in the obtained leather maintenance agent is 5.0 to 30.0% by mass, 10.0 to 25.0% by mass. It is more preferable to mix so that it may become, and it is further more preferable to mix so that it may become 15.0-23.0 mass%.
The mixing step (a) is preferably mixed so that the content of glycerin in the obtained leather maintenance agent is 5.0 to 30.0% by mass, and 10.0 to 25.0% by mass. It is more preferable to mix so that it may become%, and it is further more preferable to mix so that it may become 15.0-23.0 mass%.
Moreover, it is preferable that a mixing process (a) mixes so that content of the dilution water in the leather maintenance agent obtained may be 40.0-90.0 mass%, 50.0-80.0. It is more preferable to mix so that it may become mass%, and it is further more preferable to mix so that it may become 54.0-70.0 mass%.

  Further, the mixing step comprises mixing the silicone oil by mixing an oil-in-water silicone emulsion in which silicone oil is dispersed in an aqueous dispersion medium with a surfactant, glycerin, dilution water, and a greasing agent. Preferably, the mixing step (b) is to obtain a mixed liquid composed of the glycerin, the aqueous dispersion medium, the dilution water, the surfactant, and the greasing agent. The manufacturing method which has a mixing process (b) is a suitable manufacturing method of the maintenance agent for leathers (b). In this case, the water for the leather maintenance agent (b) comprises an aqueous dispersion medium and dilution water.

The mixing step (b) is preferably performed such that the content of the silicone emulsion in the obtained leather maintenance agent is 5.0 to 20.0% by mass, and 7.0 to 15.0% by mass. It is more preferable to mix so that it may become, and it is further more preferable to mix so that it may become 8.0-13.0 mass%.
Moreover, it is preferable to mix so that content of glycerol in the maintenance agent for leathers obtained may be 5.0-20.0 mass%, and a mixing process (b) is 7.0-15.0 mass. It is more preferable to mix so that it may become%, and it is further more preferable to mix so that it may become 8.0-13.0 mass%.
Moreover, it is preferable that a mixing process (b) mixes so that content of the dilution water in the leather maintenance agent obtained may be 40.0-85.0 mass%, 55.0-79.0. It is more preferable to mix so that it may become mass%, and it is further more preferable to mix so that it may become 61.0-76.0 mass%.
In the mixing step (b), the content of the greasing agent in the obtained leather maintenance agent (the mass of the greasing agent / the mass of the leather maintenance agent × 100 (%)) is 5.0 to 20%. It is preferable to mix so that it may become 0 mass%, It is more preferable to mix so that it may become 7.0-15.0 mass%, It is mixing so that it may become 8.0-13.0 mass%. Further preferred.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to a following example, unless the summary is changed.

[Example 1]
[Example 1-1]
Silicone emulsion (1) (amino-modified silicone 35 wt%, polyoxyethylene alkyl ether 1 to 5 wt%): Purified glycerin (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.): dilution water (water) = 25: 25: 50 The mixture was mixed at room temperature to prepare a leather maintenance agent (A1) (silicone oil content 8.75% by mass).

[Example 1-2, Example 1-3, Comparative example 1-1 to Comparative example 1-4]
A leather maintenance agent was prepared in the same manner as in Example 1-1 except that the mixing ratio of the silicone emulsion (1), purified glycerin and dilution water was changed to the mass ratio shown in Table 1.

[Evaluation]
As a leather sample, a 5 cm × 5 cm test piece was cut out from a cow suede leather bag that became harder and roughened on use. The leather sample was wiped with a cloth soaked with an appropriate amount of leather maintenance agent, and the leather maintenance agent was made to conform to the leather sample. After leaving to stand at room temperature for 30 minutes and drying, the texture (softness) and hand (stickiness, smoothness) of the leather samples were evaluated according to the following criteria. The results are shown in Table 1.

・ Flexibility (texture)
◎: Very good compared to before maintenance 〇: Good compared to before maintenance △: Slightly better than before maintenance ×: Same as before maintenance

-Stickiness (feel)
◯: Good without stickiness △: Slightly sticky ×: Sticky

・ Smoothness (feel)
◎: Very good compared to before maintenance 〇: Good compared to before maintenance △: Slightly better than before maintenance ×: Same as before maintenance

[Example 2]
[Example 2-1]
Silicone emulsion (2) (amino-modified silicone 40 wt%, polyoxyethylene alkyl ether 1 to 5 wt%): Purified glycerin (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.): Greasing agent (containing anionic, sulfonate ester salt and synthetic oil) : Diluted water (clean water) = 15: 15: 15: 55 and mixed at room temperature to prepare a leather maintenance agent (B1) (silicone oil content 6.0 mass%).

[Example 2-2, Comparative example 2-1 to Comparative example 2-4]
A leather maintenance agent was prepared in the same manner as in Example 2-1, except that the mixing ratio of the silicone emulsion (2), purified glycerin, greasing agent, and dilution water was changed to the mass ratio shown in Table 2.

  As a leather sample, the same evaluation as in Example 1 was performed using a test piece cut out by 3 cm × 5 cm from a cowhide belt that became harder and roughened by use. The results are shown in Table 2.

[Example 3]
Silicone emulsion (3) (manufactured by Kyoeisha Chemical Co., Ltd., light silicone A-544): Purified glycerin (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.): diluted water (water) = 20: 20: 80, mixed at room temperature A leather maintenance agent (C1) was prepared.

  The adjusted leather maintenance agent was put in a spray container and sprayed entirely on a sheep leather wallet. Next, using a towel, the sprayed leather maintenance agent was soaked into the wallet, allowed to stand at room temperature for 30 minutes, and dried. The bag after drying was soft and smooth without any stickiness on the surface. In addition, the wallet dirt seen before use became inconspicuous.

[Example 4]
Silicone emulsion (3) (manufactured by Kyoeisha Chemical Co., Ltd., light silicone A-544): Purified glycerin (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.): Greasing agent (manufactured by Clariant, Derminol (registered trademark) HSP, anionic, sulfonic acid ester salt And a synthetic oil): diluted water (clean water) = 10: 10: 10: 70, and mixed at room temperature to prepare a leather maintenance agent (D1).

  The adjusted leather maintenance agent was placed in a spray bottle and sprayed entirely on cowhide shoes. Next, using a towel, the sprayed maintenance agent for leather was soaked into the glove, allowed to stand at room temperature for 30 minutes, and dried. The glove after drying was soft and smooth without stickiness on the surface. Moreover, the dirt of the glove seen before use became inconspicuous.

  The leather maintenance agent of the present invention can be used for a consumer to easily maintain various leather products, and is industrially useful.

Claims (6)

It is a maintenance agent for leather containing silicone oil, glycerin and water,
The content of the silicone oil is 0.5 to 15.0 mass%,
The glycerin content is 5.0 to 30.0% by mass,
The content of the water, Ri 45.0 to 94.0% by mass,
Wherein the leather maintenance agent based on the total amount of the total leather maintenance agent content is Ru der least 90 wt% of said water and said silicone oil and the glycerol. It is a maintenance agent for leather containing silicone oil, glycerin, water, and a greasing agent .
The content of the silicone oil is 0.5 to 10.0 % by mass,
The content of the glycerin is 5.0 to 20.0 % by mass,
The content of the water, Ri 45.0 to 89.0% by mass,
Content of the said greasing agent is 5.0-20.0 mass%,
Wherein the leather maintenance agent based on the total amount of the silicone oil and the glycerol and the total der Ru leather maintenance agent content is more than 80 wt% of said water. The leather maintenance agent according to claim 1 or 2 , comprising a surfactant. Wherein the silicone oil, and the glycerin, the water and, leather maintenance agent according to claim 1 comprising a interfacial active agent. And the silicone oil, and the glycerin, the water and the interfacial active agent, leather maintenance agent according to claim 2 comprising a said fatliquoring agent. A method for producing a maintenance agent for leather comprising silicone oil, glycerin, and water,
A mixing step of mixing an oil-in-water silicone emulsion in which the silicone oil is dispersed in an aqueous dispersion medium, the glycerin, and dilution water;
In the mixing step, the silicone emulsion content in the total amount of the leather maintenance agent is 5.0 to 30.0 mass%, the glycerin content is 5.0 to 30.0 mass%, and the dilution water. The manufacturing method which mixes so that content of may become 40.0-90.0 mass%.