JPH07102191A - Aqueous pigment composition - Google Patents

Abstract

PURPOSE:To provide an aqueous pigment composition little in the separation of a solvent on its storage for a long period, giving a good touch when coated, and good in the color development of a pigment. CONSTITUTION:An aqueous pigment composition comprises 10-50wt.% of a pigment such as Hansa yellow G or ultramarine blue, 5-30wt.% of a water-soluble polymer and/or a water-dispersible polymer such as gum arabic, dextrin, carboxymethyl cellulose, a water-soluble acrylic resin or an acrylic ester copolymer emulsion, a moistening agent such as ethylene glycol or glycerol, and 0.1-10wt.% of pectolite.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for synthetic resin paints such as poster colors, watercolor paints, acrylic paints, etc., which prevent the separation of the solvent during long-term storage and have a good touch at the time of application and have good color development. Aqueous pigment composition.

[0002]

2. Description of the Related Art Aqueous pigment compositions used for poster colors, watercolor paints, synthetic resin paints such as acrylic paints, etc.
It contains a pigment, a water-soluble polymer and / or a water-dispersible polymer, a wetting agent, and water as main components, and contains bentonite to prevent separation of the solvent during long-term storage.

[0003]

However, in order to prevent the separation of the solvent during long-term storage, when bentonite is used, there is a problem that the touch when applying with a paintbrush becomes poor and the color development becomes poor. there were.

[0004]

DISCLOSURE OF THE INVENTION The object of the present invention is to obtain an aqueous pigment composition which prevents the separation of the solvent during long-term storage, has a good touch during application, and is excellent in color development. , A water-soluble polymer and / or a water-dispersible polymer, hectorite, a wetting agent, and water.

The present invention will be described in detail below. The pigment is used as a colorant, and various conventionally known inorganic and organic pigments can be used. Specifically, inorganic pigments such as carbon black, titanium oxide, red iron oxide, cadmium red, lake red, carmine 3B, 6B, ocher, barium yellow, Hansaello G, 10G, navy blue, ultramarine, phthalocyanine blue, and phthalocyanine green, or Organic pigments can be used alone or in combination,
The amount used is preferably 10 to 50% by weight based on the total amount of the aqueous pigment composition.

The water-soluble polymer and / or the water-dispersible polymer are used as a fixing agent and a color-developing agent. Examples of the water-soluble polymer include natural water-soluble polymers such as gum arabic, tragacanth, dextrin, and glue, synthetic water-soluble polymers such as polyvinyl alcohol, and semi-synthetic polymers such as carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose. Examples thereof include alkali-soluble acrylic resins such as ammonium methacrylate, polymethacrylic acid ammonium salt, polyacrylic acid ammonium salt, polyacrylic acid ammonium salt, and alkali salt of acrylic acid methacrylsan ester copolymer. The amount used is preferably 5 to 30% by weight based on the total amount of the aqueous pigment composition.

Examples of water-dispersible polymers include acrylic acid ester copolymer emulsions, styrene-acrylic acrylic acid ester copolymer emulsions, ethylene-vinyl acetate copolymer emulsions, and the amount thereof used is based on the total amount of the aqueous pigment composition. 5 to 30% by weight
(Solid content) is preferable.

The wetting agent is used for the purpose of an antifreezing agent, a re-solubility improving agent and the like, and examples thereof include glycerin, ethylene glycol, propylene glycol, dipropylene glycol and sorbitol.

Hectorite is used to prevent the separation of the solvent during long-term storage, and to prevent the touch and color development during application from being deteriorated. Hectorite is a type of montmorillonite group mineral. Two tetrahedral sheets in which SiO ₄ tetrahedra are connected with their vertices in common are connected by ions that form octahedral coordination with the remaining vertices facing inward. It is a layered silicate that has a structure in which the layers of silicates that overlap with each other and the layers of magnesium or lithium ions and water molecules coordinated with it are alternately layered.In addition to naturally occurring silicates, silicate glass in magnesium chloride solution For example, there is one synthesized by adding sodium hydroxide or potassium hydroxide and boiling. The amount used is preferably 0.1 to 10.0% by weight based on the total amount of the aqueous pigment composition.

In addition to the above components, if necessary, extenders such as calcium carbonate and barium sulfate, thickeners, antiseptic / antifungal agents, rust preventives, defoaming / antifoaming agents, and other additives may be appropriately added. You may use.

The aqueous pigment composition of the present invention can be easily obtained by mixing and dispersing the above components in a conventionally known disperser such as a three-roll mill, a horizontal ball mill or a horizontal bead mill.

[0012]

The hectorite used in the aqueous pigment composition according to the present invention has a small negative charge between silicates, and thus has a weak bond with an interlayer cation and easily swells with a solvent such as water, so that the solvent is separated. Prevent.

Further, in the hectorite, since the layer alternating with the silicate layer is composed of lithium and magnesium ions and water molecules coordinated with it, the layer alternating with the silicate layer is composed of ions such as aluminum, iron and magnesium and the ions. It is presumed that the negative charge is smaller than that of bentonite, which is composed of dispersed water molecules, so that the bond between layers is weak, and that the dispersion during application is easy and the touch is good. Further, since hectorite has less impurities than bentonite, it is presumed that hectorite does not hinder the color development of the pigment.

[0014]

EXAMPLES Examples and comparative examples will be described below.

Example 1 (Poster Color) Hansa Yellow G (CI Pigment Yellow 1) 10 parts by weight gum arabic 10 parts by weight carboxymethyl cellulose 1 part by weight glycerin 5 parts by weight hectorite 0.5 parts by weight water 33.5 Parts by weight Calcium carbonate 40 parts by weight The above components were placed in a lab mixer, stirred for 15 minutes, and then passed through a three-roll mill twice to obtain a yellow aqueous pigment composition.

Example 2 (Watercolor paint) Carmine 6B (CI Pigment Red 57) 5 parts by weight Gum arabic 15 parts by weight Dextrin 5 parts by weight Glycerin 5 parts by weight Hectorite 0.5 parts by weight Water 43.5 parts by weight Calcium carbonate 30 parts by weight The above components were placed in a lab mixer, stirred for 15 minutes, and then passed through a three-roll mill twice to obtain a red aqueous pigment composition.

Example 3 (acrylic resin paint) Ultramarine blue (CI Pigment Blue 29) 40 parts by weight Polymethacrylic acid ammonium salt 12 parts by weight Carboxymethyl cellulose 0.5 parts by weight Glycerin 5 parts by weight Hectorite 0.5 parts by weight 39 parts by weight of water 3 parts by weight of silicon oxide The above components were placed in a lab mixer, stirred for 15 minutes, and then passed through a three-roll mill twice to obtain a blue aqueous pigment composition.

Example 4 (acrylic resin paint) Ultramarine blue (CI Pigment Blue 29) 40 parts by weight Polyacrylate emulsion 15 parts by weight Carboxymethyl cellulose 0.5 parts by weight Glycerin 5 parts by weight Hectorite 0.5 parts by weight Water 36 parts by weight Silicon oxide 3 parts by weight The above components were placed in a lab mixer, stirred for 15 minutes, and then passed through a three-roll mill twice to obtain a blue aqueous pigment composition.

Comparative Example 1 A yellow aqueous pigment composition was obtained in the same manner as in Example 1 except that 0.5 part by weight of hectorite of Example 1 was replaced by 0.5 part by weight of bentonite.

Comparative Example 2 A red aqueous pigment composition was obtained in the same manner as in Example 2, except that 0.5 part by weight of hectorite of Example 2 was replaced by 0.5 part by weight of bentonite.

Comparative Example 3 A blue aqueous pigment composition was obtained in the same manner as in Example 3, except that 0.5 part by weight of hectorite of Example 3 was replaced by 0.5 part by weight of bentonite.

Comparative Example 4 A blue aqueous pigment composition was obtained in the same manner as in Example 4, except that 0.5 part by weight of hectorite of Example 4 was replaced by 0.5 part by weight of bentonite.

Comparative Example 5 (Color Standard) Except that 0.5 part by weight of hectorite of Example 1 was omitted.
A yellow aqueous pigment composition was obtained in the same manner as in Example 1.

Comparative Example 6 (Color Standard) Except that 0.5 part by weight of hectorite of Example 2 was omitted.
A red aqueous pigment composition was obtained in the same manner as in Example 2.

Comparative Example 7 (Color Standard) Except that 0.5 part by weight of hectorite of Example 3 was omitted.
A blue aqueous pigment composition was obtained in the same manner as in Example 3.

Comparative Example 8 (Color Standard) Except that 0.5 part by weight of hectorite of Example 4 was omitted.
A blue aqueous pigment composition was obtained in the same manner as in Example 4.

The aqueous pigment compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 were subjected to a time-dependent separation test, a coatability test and a color development comparison test. The results are shown in Table 1.

Separation test with time: Examples 1 to 4, Comparative Examples 1 to 1
60 ml of the aqueous pigment composition obtained in 4 was put in a glass bottle, tightly stoppered, and allowed to stand at room temperature for 30 days, and the amount of the solvent separated on the surface was measured. As a result, the separation amounts are Examples 1 to 4 and Comparative Example 1
-4 were all 0 to 0.2 ml, which was good.

Applicability test: Examples 1 to 4, Comparative Examples 1 to 4
The water-based pigment composition obtained in 1 above was mixed with water in a weight ratio of 2: 1 and applied on a drawing paper with a writing brush, and the touch at the time of application was evaluated organoleptically. ○: Touch is good △: Touch is slightly heavy

Color development comparison test: Using the colors of the aqueous pigment compositions obtained in Comparative Examples 5 to 8 as standard, Examples 1 to 4 and Comparative Examples 1 to 1
The difference in hue from the four colors was measured. (It can be said that the smaller the measured value, the better the color development.) Measurement sample: The aqueous pigment compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 8 were mixed with water at a weight ratio of 2: 1. After being applied to drawing paper with a paintbrush, it was dried. Color comparison: Example 1 against Comparative Example 5, Comparative Example 1 Example 2 against Comparative Example 6, Comparative Example 2 Example 3 against Comparative Example 7, Comparative Example 3 Example 4 vs. Comparative Example 8 Example 4 Measurement of hue: SM color computer ModelSM-
4 (manufactured by Suga Test Instruments Co., Ltd.) was used.

[0031]

[Table 1]

[0032]

As described above in detail, when the aqueous pigment composition according to the present invention is used as a poster color, a watercolor paint, a synthetic resin paint such as an acrylic paint, or the like,
It prevents the separation of the solvent during long-term storage, has a good touch during application, and is excellent in color development.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 1, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

The water-soluble polymer and / or the water-dispersible polymer are used as a fixing agent and a color-developing agent. Examples of the water-soluble polymer include natural water-soluble polymers such as gum arabic, tragacanth, dextrin, and glue, synthetic water-soluble polymers such as polyvinyl alcohol, and semi-synthetic polymers such as carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose. Examples thereof include alkali-soluble acrylic resins such as ammonium methacrylate, polymethacrylic acid ammonium salt, polyacrylic acid ammonium salt, polyacrylic acid ammonium salt, and acrylic acid methacrylic acid ester copolymer alkali salt. The amount used is preferably 5 to 30% by weight based on the total amount of the aqueous pigment composition.

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area C09D 17/00 PUJ

Claims (1)

[Claims] 1. An aqueous pigment composition containing at least a pigment, a water-soluble polymer and / or a water-dispersible polymer, a wetting agent, hectorite, and water.