JPH08134377A - Coating liquid for shoes - Google Patents

Abstract

PURPOSE: To provide a coating liquid for white shoes, containing water, a color pigment, a base and a styrene-acrylic acid copolymer or a styrene-alkyl acrylate copolymer and having excellent dispersion stability of the pigment, luster, water- resistance, applicability, adhesiveness, etc. CONSTITUTION: This coating liquid having excellent dispersion stability, luster, water-resistance, applicability and adhesiveness and useful for the coating of shoes, etc., made of natural or synthetic leather, etc., is produced by adding 0.1-20% styrene-acrylic acid copolymer or styrene-alkyl acrylate copolymer to water, neutralizing and dissolving the polymer by adding a base such as ammonia, an amine or a metal hydroxide in an amount corresponding to 50-150% of the neutralization equivalent of the copolymer and the base, dispersing 10-30% color pigment consisting of titanium oxide or titanium oxide and other pigments and optionally adding a thickening agent such as hectorite or bentonite.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating liquid which is used for natural or artificial leather such as shoes and which is colored white or any color.

[0002]

2. Description of the Related Art Conventionally, when a shoe having a white color tone is particularly cared for, white and luster are imparted by coloring with a coating solution in which titanium oxide and waxes are dispersed in an aqueous solvent. In many cases, this coating solution is prepared by dispersing titanium oxide in a common water-soluble acrylic resin or the like and mixing an O / W type wax emulsion. However, this coating solution has a poor dispersion of titanium oxide, and the pigment easily aggregates and precipitates over time.

[0003]

The object of the present invention is to use a dispersion resin having good pigment dispersibility, excellent adhesion, and water resistance so that the pigment can be stably dispersed for a long period of time when not in use. However, it is another object of the present invention to provide a coating solution for shoes which keeps a beautiful luster for a long time even after being applied on shoes.

[0004]

Means for Solving the Problems As a result of intensive studies on the above problems, the present inventors have found that a styrene-acrylic acid copolymer or a styrene-alkyl acrylate copolymer is neutralized and dissolved by a base. The water resistance after drying was good, and in addition to titanium oxide, other coloring pigments could be stably dispersed in water, and the present invention was completed.

In this shoe coating liquid, it is essential to use a styrene-acrylic acid copolymer or a styrene-alkyl acrylate copolymer that has been neutralized and dissolved with a base, and even if used alone Although good results are obtained in both dispersibility and stickiness, they can be used in combination with a wax emulsion by merely utilizing the effect as a dispersant. In this case, the amount of waxes added is 0.1% in terms of solid content.
~ 20%. If it is less than 0.1%, the effect of improving water resistance and gloss cannot be obtained, and if it exceeds 20%, the viscosity of the coating solution becomes high, so that the coating property is significantly impaired. Further, the use of a resin that is water-soluble but has water resistance and good gloss does not impair the gist of the present invention.

The styrene-acrylic acid copolymer or the styrene-alkyl acrylate copolymer is effective as a dispersant at about 0.1% or more, though it depends on the kind of the dispersion pigment and the necessary amount. Below this, a stable dispersion effect cannot be obtained, or the required amount of pigment cannot be dispersed.

When a large amount of a styrene-acrylic acid copolymer or a styrene-alkyl acrylate copolymer is added, the water resistance, the glossiness, the sedimentation stability of the pigment and the like are excellent, but the stability as a coating solution with time is improved. It is considered that the maximum addition amount is approximately 30%, because there are problems that the coating film becomes a little inferior, the coating film becomes too thick and peels off from the coating surface, and the viscosity increases and the coating property deteriorates. To be

Practically, the amount of the styrene-acrylic acid copolymer or the styrene-alkyl acrylate copolymer added is in the range of 0.1% to 20%. This means that even when titanium oxide having a high hiding power of 0.2 μm to 0.5 μm is used, the minimum compounding amount is about 0.1%, and the minimum resin compounding amount corresponding to it is 0.1%. Titanium oxide can form a stable dispersion up to about 30%, but when a large amount of pigment is dispersed in a large amount of resin, the viscosity becomes high and the coatability deteriorates. Addition of more than 20% is not preferable because it may cause peeling and other adverse effects.

The most preferable range of addition of the styrene-acrylic acid copolymer or the styrene-alkyl acrylate copolymer is 0.5% to 10%. Although the sticking property is insufficient at a low addition amount such as when using less than 1%,
The pigment has good dispersion stability, and when used in combination with other resins and waxes, the same gloss and adhesion as conventional products can be obtained. In addition, styrene-acrylic acid copolymer or styrene-
When the alkyl acrylate copolymer is added in an amount of 5% or more, the fixing property is higher than that of the conventional product, but there is a difference in the amount of the dispersed pigment, but if it exceeds 10%, the coating property is deteriorated.

A highly volatile ammonia is most preferred as a base for dissolving the resin of the shoe coating liquid of the present invention,
Any one can be used as long as it neutralizes the carboxyl group in the molecule of the styrene-acrylic acid copolymer or the styrene-alkyl acrylate copolymer. However, since it is a coating liquid used for natural and artificial leather, a base that does not adversely affect them is preferable.

Some commercially available styrene-acrylic acid copolymers or styrene-alkyl acrylate copolymers have already been neutralized to form an aqueous solution. In this case, the amount of base is sufficient and basically Although it is not necessary to add it additionally, a base may be added in order to stabilize the pH of the coating solution over time. On the contrary, considering water resistance and quick drying property, it can be said that the minimum amount of addition of the resin is preferable. The specific addition amount depends on the type of resin and the performance required for the coating liquid, but it is approximately 50% to 150% of the neutralization equivalent of styrene-acrylic acid copolymer or styrene-alkyl acrylate copolymer and base. The addition of S satisfies both the stability over time and the water resistance. In addition, the neutralization equivalent of 8
The range of 0% to 120% is the most preferable.

Titanium oxide is mainly used as a coloring component, but carbon black, titanium black, zinc white, in order to make the color dull or to give an arbitrary color by utilizing the hiding power of titanium oxide, Red iron oxide, chromium oxide,
Iron black, cobalt blue, alumina white, iron oxide yellow,
Viridian, zinc sulfide, lithopone, cadmium yellow,
Red, gadmium red, yellow lead, molybdate orange,
Inorganic pigments such as zinc chromate, strontium chromate, white carbon, ultramarine blue, lead white, navy blue, manganese violet, aluminum powder, brass powder, CI16185
, CI45430, CI16255, CI45410, CI45440
, CI45100, CI19140, CI15985, CI42053
, CI42090, CI73015, CI15850, CI15585
, CI15630, CI45170, CI15800, CI15880
, CI12120, CI45380, CI26100, CI73360
, CI17200, CI12085, CI45370, CI12075
, CI21110, CI15510, CI45425, CI45350
, CI47005, CI47000, CI21090, CI61570
, CI61565, CI59040, CI42095, CI73000
, CI42052, CI69825, CI42090, CI20170
, CI60725, CI45190, CI15865, CI26105
, CI16155, CI16150, CI14700, CI12140
, CI15620, CI11725, CI14600, CI12100
, CI11680, CI18950, CI10316, CI11380
, CI11390, CI13065, CI18820, CI10020
, CI42085, CI61520, CI74160, CI60730
, CI20470 and the like, lake pigments of acid dyes, fish scale foil, various mica titanium, pearl pigments such as sericite, mascopite, pearl oyster powder, abalone shell powder and Takase shell powder.

In the shoe coating liquid of the present invention, if necessary, a surfactant, a fragrance, an oil and fat, a hardly volatile hydrocarbon, a preservative,
It is possible to add additives such as antifungal agents and thickeners. Surfactants are expected to have favorable effects such as those acting on the interface between the leather and the coating film to increase the physical adhesive force, and those improving the water resistance at the interface between the coating film surface and air and water. The fragrance can be expected to have an effect of masking an unpleasant odor when applied, or conversely improving the usability. Further, surfactants and fragrances which are hardly volatile, and fats and oils and hardly volatile hydrocarbons are also useful as plasticizers for styrene-acrylic acid copolymers or styrene-alkyl acrylate copolymers. However, when the plasticizer exerts an appropriate effect, the brittleness of the coating film is suppressed, and the coating film is flexible and has high adhesiveness and excellent durability.

Thickeners are also effective in reducing pigment settling. As thickeners, natural smectite clays called hectorite, bentonite, montmorillonite, beidellite, etc., and so-called clay thickeners such as synthetic clays similar to or similar to them, or chain secondary agglomeration Inorganic fine particle powder having a primary particle size of 50 nm or less, such as fine particle silica, ultrafine particle aluminum oxide, and ultrafine particle titanium oxide, which impart pseudoplasticity to liquid, and thickening polysaccharides such as xanthan gum, welan gum, guar gum, taracant gum, and locust bean gum Etc. are raised. Of these, natural and synthetic clay thickeners and xanthan gum, welan gum, and xanthan gum or thickening polysaccharides using a combination of welan gum and guar gum are substances that swell remarkably with water to obtain a thickening effect, and pigments such as titanium oxide are It is very effective because it causes steric hindrance when it aggregates.
Further, the natural and synthetic clay thickeners are particularly preferable thickeners because they form the most ideal steric hindrance because the end face of the tabular grain structure and the basal surface electrically attract each other to form a card house structure.

The shoe coating liquid of the present invention neutralizes and dissolves a styrene-acrylic acid copolymer or a styrene-alkyl acrylate copolymer with a base, and then adds a pigment or the like to a ball mill, bead mill, A colored liquid is prepared by dispersing with a sand mill, roll mill, kneader, homogenizer, ultrasonic disperser, etc., and waxes, surfactants, fragrances, etc. are required considering the performance as a coating liquid for shoes such as gloss. However, there is no problem even if all the materials are mixed at once and dispersed. In addition, a pigment having good wettability with a solvent and weak secondary aggregation, a pigment which has been previously treated so as to be easily dispersed, or the like can provide a shoe coating solution having sufficient performance even by stirring.

[0016]

EXAMPLES Next, the present invention will be described in more detail with reference to examples.

The following coloring liquids and wax emulsions were prepared and Examples and Comparative Examples were prepared. (Coloring liquid 1) Water 54% Ammonia water (25%) 6% Julimer AT-960P (Styrene-alkyl acrylate copolymer; Nihon Pure Chemical Co., Ltd. trade name) 20% Titanium oxide 20% or more with a bead mill 1 Kneading was carried out for a time to obtain a colored liquid 1. (Coloring liquid 2) Water 39.95% Johncryl 61J (Styrene-alkyl acrylate copolymer, resin content 31%, ammonia neutralization aqueous solution; product name of Johnsonson Co., Ltd.) 30% Titanium oxide 30% Yellow iron oxide 0. Coloring liquid 2 was obtained by kneading at least 05% by a bead mill for 1 hour. (Coloring liquid 3) Water 59% Triethanolamine 1% Johncryl 62 (Styrene-alkyl acrylate copolymer, 34% ammonia-neutralized aqueous solution; Jonson Corporation trade name) 20% Titanium oxide 15% Red No. 204 (CI15585) ) 5% or more was kneaded with a bead mill for 1 hour to obtain a colored liquid 3. (Coloring liquid 4) Water 67.9% Triethanolamine 12% Johncryl 67 (Styrene-alkyl acrylate copolymer; Johnson Co. product name) 10% Titanium oxide 10% Yellow No. 5 Al lake (CI15985) 1% or more was kneaded with a bead mill for 1 hour to obtain a coloring liquid 4. (Coloring liquid 5) Water 60% Cybinol X951 · 299W (water-soluble urethane resin; Saiden Chemical Co., Ltd. trade name) 20% Titanium oxide 20% The above was kneaded with a bead mill for 1 hour to obtain a coloring liquid 5. (Coloring liquid 6) Water 60.65% Paraloid WR-748 (water-soluble acrylic resin; trade name of ROHM & HAAS) 9.3% Titanium oxide 30% Yellow iron oxide 0.05% Kneaded with a bead mill for 1 hour, Coloring liquid 6 was obtained. (Coloring liquid 7) Water 73.2% Julimer AC10NP (sodium polyacrylate; product name of Nippon Pure Chemicals Co., Ltd.) 6.8% Titanium oxide 15% Red No. 204 5% or more is kneaded with a bead mill for 1 hour and colored. Liquid 7 was obtained. (Coloring liquid 8) Water 79.9% Paraloid WR-748 10% Titanium oxide 10% Yellow No. 5 Al lake 0.1% The above components were kneaded with a bead mill for 1 hour to obtain a coloring liquid 8. (Wax emulsion 1) Hoechst wax LP (wax; Hoechst trade name) 20% triethanolamine 3.4% water (hot water) 76.6% Heat wax to 100 ° C and add triethanolamine while stirring. It was saponified and hot water was gradually added to obtain a wax emulsion 1. <Example Blend> (Example 1) Water 29% Wax Emulsion 1 10% Colored Liquid 1 60% Sodium Omazine (antiseptic / antifungal agent) 1% The above ingredients were stirred for 1 hour with a homogenizer to obtain Example 1. . (Example 2) Water 66.9% Coloring liquid 2 33% 1,2-Benzisothiazoline 3-one 0.1% The above components were stirred for 1 hour with a homogenizer to obtain Example 2. (Example 3) Water 55% Hoechst emulsion T-730 (66% wax emulsion; trade name of Hoechst company) 30% Coloring liquid 3 10% Shell pearl H (natural pearl pigment; Kakuhachi scale foil product name) ) 5% or more was stirred with a homogenizer for 1 hour to obtain Example 3. (Example 4) Water 19.8% Hoechst emulsion T-730 10% Coloring liquid 470% Xanthan gum 0.2% The above components were stirred for 1 hour with a homogenizer to obtain Example 4. (Example 5) Water 80.5% Ammonia water (25%) 1.5% Johncryl 67 (Styrene-alkyl acrylate copolymer; product name of Jonsson Corporation) 5% Titanium oxide 12% Laponite XLG (Synthetic smectite) Laporte Industries Ltd. (trade name) 1% or more was stirred with a homogenizer for 1 hour to obtain Example 5. (Example 6) Water 66.9% Ammonia water (25%) 3% Julimer AT-960P 10% Wax emulsion 1 10% Carbon black 10% 1,2-Benzisothiazoline 3-one 0.1% or more was added. Stirring with a bead mill for 1 hour gave Example 6. (Comparative Example 1) Water 29% Wax emulsion 1 10% Coloring liquid 5 60% Sodium omazine 1% The above components were stirred for 1 hour with a homogenizer to obtain Comparative Example 1. Comparative Example 2 Water 66.9% Coloring liquid 6 33% 1,2-Benzisothiazoline-3-one 0.1% The above components were stirred for 1 hour with a homogenizer to obtain Comparative Example 2. (Comparative Example 3) Water 55% Hoechst emulsion T-730 30% Coloring liquid 710% Shell pal H (natural pearl pigment; Kakuhachi scale foil product name) 5% or more was stirred with a homogenizer for 1 hour. Comparative Example 3 was obtained. (Comparative Example 4) Water 19.8% Hoechst emulsion T-730 15% Colored liquid 870% Xanthan gum 0.2% The above components were stirred for 1 hour with a homogenizer to obtain Comparative Example 4. (Comparative Example 5) Water 82% Cybinol X591.299W 5% Titanium oxide 12% Laponite XLG 1% The above components were stirred for 1 hour with a homogenizer to obtain Comparative Example 5. (Comparative Example 6) Water 69.9% Julimer AC10NP 10% Wax emulsion 1 10% Carbon black 10% 1,2-Benzisothiazoline 3-one 0.1% The above was stirred for 1 hour with a homogenizer to obtain Comparative Example 6. It was

The following tests were carried out using Examples 1-6 and Comparative Examples 1-6. Test 1--Redispersibility Test 1 (Settling Test) 100 mm of Examples 1 to 6 and Comparative Examples 1 to 6 were placed in a test tube with an inner diameter of 1 cm and a closed cap, and allowed to stand at room temperature for 1 month to give a precipitate and a supernatant. Measure the height of the interface. The higher the value, the more bulky the sediment and the better the redispersibility. Test 2--Redispersibility test 2 (actual use test over time) Examples 1 to 6 and Comparative Examples 1 to 6 were filled in the applicator of FIG. 1 and allowed to stand still for 1 month in an upward direction, and then vertically. About 20 cm,
After applying vibration for about 1 minute at a speed of about 1 Hz, write on a glass plate, compare the initial drawing line with the hue and density, and visually judge the difference. {○} ... Almost unchanged. {△} ・ ・ ・ Slight change in hue or density {×} ・ ・ ・ Extremely thin or unwritable. {-} ...
Test that cannot be written from the beginning 3--Adhesion test Examples 1 to 6 and Comparative Examples 1 to 6 were filled in the applicator of FIG. 1 and applied to the shoes of 20 monitors on a rainy day, and the indoors and outdoors were tested. They were asked to walk randomly, and after 6 hours, changes in the coating film were examined. {○} ... Almost no change. {△} ... There is a change but there is a coating film remaining. {X} ... Almost no coating film remains.

[Table 1]

[0019]

As described above, according to the present invention, the dispersibility is good, the adhesion is good, and the applicability is good because it can be filled in a simple applicator.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an applicator used in an example.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // A43D 95/06 9446-4F A47L 23/08

Claims (2)

[Claims] 1. A shoe coating liquid containing at least water, a color pigment, a base, and a styrene-acrylic acid copolymer or a styrene-alkyl acrylate copolymer. 2. Titanium oxide alone is used as a colorant in an aqueous solution prepared by neutralizing and dissolving a styrene-acrylic acid copolymer or a styrene-alkyl acrylate copolymer with ammonia, amines and a metal hydroxide salt. Alternatively, the coating liquid for shoes according to claim 1, which is dispersed in combination with other pigments.