JPH10202081A - Dispersant for inorganic and organic materials, its production and dispersing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a dispersant capable of stabilizing the dispersibility of an inorg. material such as TiO2 and an org. material typified by an azo pigment such as pyrazolone in an aq. soln. over a long period of time by incorporating a hydrolysate obtd. by hydrolyzing water-soluble hemicellulose with hemicellulase as an effective component. SOLUTION: This dispersant for stabilizing the dispersion of an inorg. material such as TiO2 and an org. material such as an azo pigment in an aq. soln. contains a hydrolysate obtd. by hydrolyzing water-soluble hemicellulose with hemicellulase as an effective component. One or more among β-galactosidase, β-galactanase, α-arabinosidase, α-arabanase, β-xylosidase, β-xylanase, α- glucosidase, α-glucanase, β-glucosidase and β-glucanase are used as the hemicellulase.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dispersant for inorganic and organic substances, a method for producing and dispersing the same, and more particularly, to inorganic substances such as titanium dioxide, yellow iron oxide and red iron oxide, and anilide acetoacetate and pyrazolone. For preventing dispersion and precipitation of organic substances such as azo pigments such as copper phthalocyanine, phthalocyanine pigments such as copper phthalocyanine, and condensed polycyclic pigments such as anthraquinone and quinacridone in an aqueous solution; About.

[0002]

2. Description of the Related Art Conventionally, dispersion stabilization of an inorganic substance such as titanium dioxide and an organic substance such as quinacridone in an aqueous solution has been performed by using a water-soluble acrylic resin, a water-soluble styrene-acrylic resin, and a water-soluble styrene-maleic acid resin. , Acrylic resin, alkyd resin, vinyl resin, polyester resin,
Synthetic water-soluble polymers such as styrene resin, maleic resin, urethane resin, etc., gum arabic, tragacanth gum, carrageenan, xanthan gum, gelatin, sodium caseinate, guar gum, tara gum, cloth laver, agar, furceleran, tamarind seed polysaccharide, karaya gum, troloi oil, pectin, Sodium alginate, pullulan, gellan gum, locust bean gum, albumin such as whey, natural water-soluble polymers such as various starches, carboxymethyl cellulose (CMC), methyl cellulose (MC), hydroxyethyl cellulose (HEC), propylene glycol alginate and soluble Semi-natural water-soluble polymers, such as modified starch, represented by starch, have been used as dispersants.

When an inorganic substance such as titanium dioxide and an organic substance such as quinacridone are dispersed using these synthetic water-soluble polymers, titanium dioxide and quinacridone precipitate when left for a long time, and a good dispersion state cannot be maintained. In addition, when a natural or semi-natural water-soluble polymer is used, a large amount of a dispersant is required to maintain a good dispersion state, which increases the viscosity of the dispersion system and impairs the workability during production. In addition, it can be dispersed depending on the type of water-soluble polymer
The pH range is limited and lacks practicality.

[0004] When titanium dioxide is dispersed and stabilized using gum arabic, a good dispersion state is maintained. However, the supply of gum arabic is easily affected by the weather of the producing country, and the price fluctuates greatly. Recently, a natural vegetable gum that can be stably supplied has been desired.

As described above, even when a water-soluble polymer is used in a final product such as a paint or a water-based ink, the dispersion must be stable for a long period of time.

[0006]

The present invention relates to the condensation of inorganic substances such as titanium dioxide, yellow iron oxide and red iron oxide, azo pigments such as pyrazolone, phthalocyanine pigments such as copper phthalocyanine, and condensation of anthraquinone and quinacridone. It is an object of the present invention to provide a dispersant which stabilizes the dispersibility of an organic substance represented by a polycyclic pigment or the like in an aqueous solution for a long period of time, can be supplied stably at low cost, and a method for producing and dispersing the same.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, have found that water-soluble hemicellulose, particularly water-soluble hemicellulose derived from beans, and among these constituent sugars, the main constituent sugar is Some galactose, arabinose,
Neutral sugar chains consisting of xylose, glucose, fucose, and rhamnose are converted to specific hemicellulases, ie, β-galactosidase, galactanase, α-arabinosidase, arabanase, β-xylosidase from microorganisms and plants.
When decomposed products obtained by decomposing with hemicellulase represented by xylanase, α-glucosidase, β-glucosidase, etc. were used as a dispersing agent, it was found that inorganic substances represented by titanium dioxide could be dispersed and stabilized. Was. The present invention has been completed based on such findings.

That is, the present invention provides a dispersant for inorganic and organic substances containing a hydrolyzate of water-soluble hemicellulose by hemicellulase as an active ingredient, and an inorganic and organic substance characterized by hydrolyzing water-soluble hemicellulose with hemicellulase. A method for producing a dispersant for a substance, and a method for dispersing an inorganic or organic substance, comprising using a hydrolyzate obtained by hydrolyzing water-soluble hemicellulose using hemicellulase. Hereinafter, hemicellulase may be referred to as an enzyme in the present invention.

[0009] The water-soluble hemicellulose in the present invention comprises:
Plant-derived galactose, arabinose, xylose,
Any glucose can be used as long as it contains one or two or more types of glucose, but those derived from beans, particularly soybeans, and especially those derived from cotyledons are preferable. Further, it is preferable that the content of protein mixed in soybean hemicellulose is small, specifically, it is 10% or less, more preferably 5% or less.

The water-soluble hemicellulose can be used with any molecular weight, but is preferably a polymer, and has an average molecular weight of several thousand to several million, specifically, 5,000 to 5,000.
Preferably it is one million. If the molecular weight is too large, the viscosity will be too high and workability will be poor. The average molecular weight of the water-soluble hemicellulose is a value determined by an intrinsic viscosity method for measuring the viscosity in a 0.1 M NaNO3 solution using standard pullulan (manufactured by Showa Denko KK) as a standard substance. Uronic acid was measured by the Blumenkrantz method, and neutral sugar was measured by the GLC method after alditol acetate conversion.

The water-soluble hemicellulose can be extracted from a raw material containing hemicellulose with water, and in some cases, heated and eluted under acid or alkaline conditions, or decomposed and eluted with hemicellulase. An example of a method for producing water-soluble hemicellulose is as follows.

[0012] Oil seeds, such as soybean, palm, palm, corn, cottonseed and other shells from which fats and proteins have been removed, or cereals such as rice, wheat, beet and other starches and sugars, but other ingredients such as lees. Plants can be used as raw materials. If the raw material is soybean, tofu, soymilk, and okara which is a by-product when producing isolated soybean protein can be used.

These raw materials are preferably used under acidic or alkaline conditions, preferably at a pH around their isoelectric point, preferably 130 ° C. or lower and 80 ° C. or higher, more preferably 130 ° C. or lower.
After decomposing by heating at 0 ° C. or higher, the water-soluble fraction is fractionated and dried as it is, or by drying, for example, by treating with activated carbon, resin, or ethanol to remove hydrophobic substances or low-molecular substances. And water-soluble hemicellulose. Moreover, you may decompose and extract with a polysaccharide decomposing enzyme.

The water-soluble hemicellulose is a polysaccharide containing, as constituent sugars, galactose, arabinose, xylose, fucose, glucose, rhamnose and galacturonic acid. The details of the analysis results of the components of the water-soluble hemicellulose obtained by hydrolysis are described in JP-A-4-325058.
It is described in the specification.

A hydrolyzate prepared by decomposing a specific structure of water-soluble hemicellulose with hemicellulase has a function as a dispersant for inorganic and organic substances. For example, β-1,4 and β-1,6 which are main constituent sugars of water-soluble hemicellulose
The hydrolyzate obtained by selectively hydrolyzing the bound galactose chain with β-galactosidase or galactanase can be used as a dispersant for inorganic and organic substances. The above β-galactosidase and galactanase are of the genus Aspergillus, preferably Aspergillus nige
r, Batillus genus, preferably Batillus subtilis, Esche
genus richia, preferably Escherichia freundii, Strep
genus tococcus and genus Erwinia, preferably Erwinia ca
Charonia Iampas, a microorganism belonging to the group of rotovora
Suitable are those produced by shellfish such as, and beans such as Jack Bean.

A degraded product obtained by selectively decomposing α-1,3 and α-1,5 linked arabinose chains, which are main constituent sugars of water-soluble hemicellulose, with α-arabinosidase or arabanase. Can also be used as dispersants for inorganic and organic substances. The above α-arabinosidase and arabanases are of the genus Aspergillus, preferably
Aspergillus niger, genus Batillus, preferably Batillu
s subtilis, and genus Erwinia, preferably Erwinia car
Those produced by microorganisms belonging to the group of otovora are suitable.

Furthermore, a decomposed product obtained by selectively decomposing a β-1,4-linked xylose chain, which is a main constituent sugar of water-soluble hemicellulose, with β-xylosidase or xylanase is similarly used as a dispersant. be able to. The above β-xylosidase and xylanase were obtained from Aspergil
genus lus, preferably Aspergillus niger, and Batillu
Suitable are microorganisms belonging to the genus s, preferably Batillus subtilis, and those produced by plants.

Further, a degradation product obtained by selectively decomposing a glucose chain linked to α-1,4 and α-1,6, which is a main constituent sugar of water-soluble hemicellulose, with α-glucosidase or glucanase, Similarly, it can be used as a dispersant. The above α-glucosidase and glucanase are:
Genus Aspergillus, preferably Aspergillus niger, Bati
Use is made of microorganisms belonging to the genus llus, preferably Batillus subtilis, and the yeast group.

A degraded product obtained by selectively decomposing β-1,4 and β-1,6 linked glucose chains, which are main constituent sugars of water-soluble hemicellulose, with β-glucosidase or cellulase or glucanase. Can also be used as a dispersant. The above β-glucosidase or cellulase or glucanase is of the genus Aspergillus, preferably
Aspergillus niger, genus Batillus, preferably Batillu
s subtilis, genus Trichoderma, preferably Trichoderma
viride and genus Polyporus, preferably Polyporus t
Those produced by microorganisms belonging to the group ulipiferae are suitable.

The dispersant of the present invention can be used alone, and a more stable dispersion state can be obtained than when gum arabic or modified starch is used. When used in combination with natural water-soluble polymers, it is possible to compensate for the disadvantages of existing dispersants, and when used in combination with one or more of these various water-soluble polymers, the effect may be further improved. is there.

[0021]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In the examples, parts and% mean weight basis.

Preparation of Water-Soluble Hemicellulose Twice the amount of water was added to raw okara obtained in the step of producing isolated soybean protein, and the pH was adjusted to 4.5 with hydrochloric acid.
Hydrolyzed for 5 hours. After cooling, centrifuge (10000G ×
30 minutes), and separated into a supernatant and a precipitate. The precipitate separated in this manner was further washed with water of an equal weight, centrifuged, the supernatant was combined with the previous supernatant, treated with an activated carbon column, and dried to obtain water-soluble hemicellulose (a).

Further, this water-soluble hemicellulose (a) is
Dissolve in 20 mM acetate buffer (pH 5.0) to 3.0%,
β-galactosidase is added to water-soluble hemicellulose in an amount of 0.1 g / g.
Decomposition was performed at 35 ° C for 24 hours after adding 5 units equivalent. 90 ℃
For 10 minutes to deactivate the enzyme, transferred to a dialysis tube, dialyzed at 4 ° C. for 24 hours, and dried to obtain water-soluble hemicellulose (b).

Water-soluble hemicellulose (a) is dissolved in 20 mM acetate buffer (pH 4.5) to 3.0%, and α-arabinosidase is added in an amount of 0.5 units per 1 g of water-soluble hemicellulose. Time resolved. Heat at 90 ° C for 10 minutes to inactivate the enzyme, transfer to dialysis tubing and
After dialysis for 24 hours, it was dried to obtain water-soluble hemicellulose (c).

A water-soluble hemicellulose (a) was dissolved in 20 mM acetate buffer (pH 5.5) to 3.0%, and β-xylosidase was added in an amount of 1.0 unit per 1 g of water-soluble hemicellulose, and decomposed at 35 ° C. for 24 hours. did. Heat at 90 ° C for 10 minutes to inactivate the enzyme, transfer to dialysis tubing and transfer at 4 ° C for 24 hours.
After dialysis for a time, dry and dissolve in water-soluble hemicellulose (d)
I got

A water-soluble hemicellulose (a) is dissolved in 20 mM acetate buffer (pH 6.0) so as to have a concentration of 3.0%, α-glucosidase is added thereto in an amount of 1.0 unit per 1 g of water-soluble hemicellulose, and decomposed at 35 ° C. for 24 hours. did. Heat at 90 ° C for 10 minutes to inactivate the enzyme, transfer into dialysis tubing and transfer at 4 ° C for 24 hours.
After dialysis for hours, dry and dissolve in water-soluble hemicellulose (e)
I got

Water-soluble hemicellulose (a) is dissolved in 20 mM acetate buffer (pH 5.0) to 3.0%, β-glucosidase is added in an amount of 0.8 units per 1 g of water-soluble hemicellulose, and decomposed at 35 ° C. for 24 hours. did. Heat at 90 ° C for 10 minutes to inactivate the enzyme, transfer into dialysis tubing and transfer at 4 ° C for 24 hours.
After dialysis for a time, dry and water-soluble hemicellulose (f)
I got

The above results are summarized as follows. Composition ratio (%) Ingredients (a) (b) (c) (d) (e) (f) ────────────────────────── ───────── Moisture 5.5 6.8 7.9 6.6 8.7 8.9 Crude protein 5.2 8.1 8.3 7.9 6.2 5.9 Crude ash 7.7 7.1 6.9 10.7 6.1 6.1 Polysaccharide 81.6 78.0 76.9 74.8 79.0 79.1 ───────── ──────────────────────────

Example 1 5 g of titanium dioxide was weighed into a 100-ml graduated cylinder, and water-soluble hemicellulose (b) was adjusted to a final concentration of 0.1%, 0.05%, 0.01%, and 0.005% in the dispersion system. 100m
g, 50 mg, 10 mg, and 5 mg each, and deionized water was added to bring the total volume to 100 ml. Hold this measuring cylinder for 30 seconds.
The shaker was vigorously shaken at a speed of 350 rpm / min, allowed to stand at room temperature, and the dispersing power with respect to titanium dioxide was determined based on the syneresis ratio after 24 hours. The smaller the syneresis ratio, the stronger the dispersing power for titanium dioxide. Syneresis rate was 8% when the amount of hemicellulose (b) in the dispersion was 0.01%.
%, 0.05% and 3%, a good dispersion state was maintained with a small amount of addition.

Example 2 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 1 except that water-soluble hemicellulose (b) was used instead of water-soluble hemicellulose (b). . The syneresis ratio was 14% when the amount of hemicellulose (c) added in the dispersion was 0.01%, and 2% when it was 0.05%.

Example 3 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 1 except that water-soluble hemicellulose (d) was used instead of water-soluble hemicellulose (b). . The rate of syneresis was 15% when the amount of hemicellulose (d) in the dispersion was 0.05%, which tended to be lower than that of hemicellulose (b) and (c). The dispersed state was maintained.

Example 4 The dispersibility in titanium dioxide was evaluated in exactly the same manner as in Example 1 except that water-soluble hemicellulose (e) was used instead of water-soluble hemicellulose (b). . The rate of syneresis was 4% when the amount of hemicellulose (e) in the dispersion was 0.05%, and a good dispersion state was maintained with a small amount of addition.

Example 5 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 1 except that water-soluble hemicellulose (b) was used instead of water-soluble hemicellulose (b). . The syneresis ratio was 6% when the amount of hemicellulose (f) added in the dispersion was 0.01%, and 2% when it was 0.05%.

Comparative Example 1 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 1 except that water-soluble hemicellulose (b) was used instead of water-soluble hemicellulose (b). . The syneresis ratio was 30% when the amount of hemicellulose (a) in the dispersion was 0.05% and 12% when 0.1% was added, indicating that titanium dioxide was inferior in dispersibility to water-soluble hemicellulose hydrolyzed with hemicellulase.

Comparative Example 2 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 1 except that gum arabic was used instead of using the water-soluble hemicellulose (b). Even when the amount of gum arabic added was 0.5% in the system, titanium dioxide tended to precipitate over time, and a good dispersion state was not obtained.

Comparative Example 3 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 1, except that pectin was used instead of water-soluble hemicellulose (b).
Even when the addition amount of pectin was as high as 0.5% in the system, titanium dioxide tended to precipitate over time, and a good dispersion state was not obtained.

Comparative Example 4 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 1 except that carrageenan was used instead of water-soluble hemicellulose (b). Syneresis rate is 0.1% of carrageenan added in dispersion
In 15% and 0.5% in 3%, a good dispersion state was exhibited, but the viscosity of the system was high and workability was poor.

Comparative Example 5 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 1 except that carboxymethylcellulose was used instead of water-soluble hemicellulose (b). Syneresis rate is 19% at 0.05% carboxymethylcellulose in the dispersion, 11% at 0.1%
And the dispersibility of titanium dioxide was inferior to water-soluble hemicellulose hydrolyzed with hemicellulase.

The results of the syneresis ratio are summarized as follows. In addition, the thing which does not contain a water-soluble polymer was used as a control. ─────────────────────────────────── Syneresis rate (%) ─────────濃度 Water soluble polymer concentration (%) 0 0.005 0.01 0.05 0.1 0.5 ─────────────────────対 照 Control section 80 Example 1 81 8 3 0 0 Example 2 80 14 2 0 0 Example 3 81 80 15 4 0 Example 4 83 82 4 2 0 Example 5 32 16 200 0 Comparative Example 1 82 83 35 12 0 Comparative Example 2 82 80 74 46 41 Comparative Example 3 84 82 79 58 21 Comparative Example 4 82 81 71 15 3 Comparative Example 5 82 79 19 11 5 ─── ────────────────────────────────

Example 6 5 g of titanium dioxide was weighed into a measuring cylinder having a capacity of 100 ml, and 10 mg and 50 mg of water-soluble hemicellulose (b) were added so that the final concentrations in the dispersion were 0.01% and 0.05%. 0.1M adjusted to pH 2, 3, 4, 5, 6, 7
Of citrate buffer was added to bring the total volume to 100 ml. The graduated cylinder of each pH is shaken at 350 rpm / min for 30 seconds.
The mixture was shaken vigorously at the speed described above, allowed to stand still at room temperature, and the dispersing power to titanium dioxide was determined by the syneresis rate after 24 hours. The smaller the syneresis ratio, the stronger the dispersing power for titanium dioxide. Water-soluble hemicellulose (b)
In the system with 0.01% addition, good dispersion was maintained in the range from pH 3 to 7, and in the system with 0.05% addition, in the wide range from pH 2 to 7.

Example 7 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 6, except that water-soluble hemicellulose (c) was used instead of water-soluble hemicellulose (b). . 0.01 water-soluble hemicellulose (c)
In the system with the addition of%, the dispersion was well maintained in the range of pH 3 to 5, and in the system with the addition of 0.05%, the dispersion was well maintained in the wide range of pH 2 to pH 7.

Example 8 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 6, except that water-soluble hemicellulose (d) was used instead of water-soluble hemicellulose (b). . 0.05 water-soluble hemicellulose (d)
In the system to which% was added, a good dispersion state was maintained in a wide range from pH2 to pH7.

Example 9 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 6, except that water-soluble hemicellulose (e) was used instead of water-soluble hemicellulose (b). . 0.05 water-soluble hemicellulose (e)
In the system to which% was added, a good dispersion state was maintained in a wide range of pH from 3 to 6.

Example 10 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 6, except that water-soluble hemicellulose (f) was used instead of water-soluble hemicellulose (b). . 0.01 water-soluble hemicellulose (f)
In the system with% addition, good dispersion was maintained in the range of pH 4 to 8, and in the system with 0.05% addition, good dispersion was maintained in the wide range of pH 2 to 7.

Comparative Example 6 The dispersibility in titanium dioxide was evaluated in exactly the same manner as in Example 6, except that water-soluble hemicellulose (a) was used instead of water-soluble hemicellulose (b). . 0.05 water-soluble hemicellulose (a)
In the system to which% was added, a good dispersion state was maintained in a wide range from pH2 to pH7.

Comparative Example 7 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 6, except that gum arabic was used instead of water-soluble hemicellulose (b). Regardless of the amount of gum arabic added, titanium dioxide tended to precipitate over time, irrespective of the amount added, and a good dispersion state could not be obtained.

Comparative Example 8 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 6, except that pectin was used instead of using water-soluble hemicellulose (b).
Even when the addition amount of pectin was as high as 0.5% in the system, titanium dioxide tended to precipitate over time, and a good dispersion state was not obtained.

Comparative Example 9 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 6 except that carrageenan was used instead of using water-soluble hemicellulose (b). The syneresis ratio was 0.05 when the amount of carrageenan added in the dispersion was 0.05.
%, A good dispersion state was exhibited only in a narrow range of pH 4 to 5, but no dispersion of titanium dioxide was observed at any pH at an addition amount of 0.01%.

Comparative Example 10 The dispersibility in titanium dioxide was evaluated in the same manner as in Example 6, except that carboxymethylcellulose was used instead of water-soluble hemicellulose (b). The rate of syneresis was poor irrespective of the pH in the dispersion, and no tendency to dispersion was observed.

The results of the syneresis rate are summarized as follows. In addition, the thing which does not contain a water-soluble polymer was used as a control. ─────────────────────────────────── Syneresis rate (%) ─────────中 pH in the system 2 3 4 5 6 7 ────────────────────────────量 Addition amount (concentration%) Control group 80 81 80 82 76 81 Example 6 0.01 65 2 0 5 8 12 0.05 10 1 0 0 2 5 Example 7 0.01 81 80 28 31 68 82 0.05 10 5 0 2 6 10 Example 8 0.01 85 83 71 72 79 80 0.05 10 8 7 6 7 7 Example 9 0.01 84 84 85 83 83 84 0.05 33 15 12 10 15 18 Example 10 0.01 85 54 8 0 9 0.05 37 5 0 0 2 4 Comparative Example 6 0.01 85 84 78 74 79 85 0.05 35 18 17 16 20 42 Comparative Example 7 0.01 85 85 81 78 78 82 0.05 85 61 32 28 49 84 Comparative Example 8 0.01 85 84 78 74 79 85 0.05 45 6 14 24 38 42 Comparative Example 9 0.01 85 84 83 84 84 85 0.05 83 74 71 68 80 84 Comparative Example 10 0.01 85 84 81 84 84 85 0.05 85 83 80 82 83 85 ───────── ────────────── ───────────

As described above, by using a hydrolyzate obtained by decomposing water-soluble hemicellulose with an enzyme such as hemicellulase as a dispersion stabilizer of titanium dioxide, gum arabic, pectin and carrageenan which are commonly used dispersants are used. And a good dispersion state in a wide pH range of pH 2 to 7 with a smaller amount of addition than water-soluble polymer dispersants such as carboxymethyl cellulose and carboxymethyl cellulose.

Example 11 1 g of quinacridone was weighed into a 100 ml graduated cylinder, and water-soluble hemicellulose (b) was added to 100 ml so that the final concentration in the dispersion was 0.1%, 0.05%, 0.01%, and 0.005%.
g, 50 mg, 10 mg, and 5 mg each, and deionized water was added to bring the total volume to 100 ml. Hold this measuring cylinder for 30 seconds.
The shaker was vigorously shaken at a speed of 350 rpm / min, and the mixture was allowed to stand still at room temperature, and the dispersing power for quinacridone was determined by the syneresis rate after 2 weeks. The smaller the rate of syneresis, the stronger the dispersing power for quinacridone. The syneresis ratio was 9. when the amount of hemicellulose (b) in the dispersion was 0.005%.
5%, 8.5% at 0.01%, 8% at 0.05%, and 6% at 0.01%, a good dispersion state was maintained with a small amount of addition.

Example 12 The dispersibility in quinacridone was evaluated in the same manner as in Example 11, except that water-soluble hemicellulose (b) was used instead of water-soluble hemicellulose (b). Syneresis rate is 10% when the amount of hemicellulose (c) in the dispersion is 0.005%, and 7% and 0.05% when 0.01%.
And 8% at 0.01%, and a good dispersion state was maintained with a small amount of addition.

Example 13 The dispersibility in quinacridone was evaluated in the same manner as in Example 11, except that water-soluble hemicellulose (ii) was used instead of water-soluble hemicellulose (ii). The rate of syneresis was 13% when the amount of hemicellulose (d) in the dispersion was 0.05%, and tended to be inferior to Hemicellulose (b) and (c), but 13% at 0.005%. A good dispersion state was maintained at 0.01% to 10%.

Example 14 The dispersibility in quinacridone was evaluated in the same manner as in Example 11 except that water-soluble hemicellulose (e) was used instead of water-soluble hemicellulose (b). Syneresis rate was 14% when the amount of hemicellulose (e) in the dispersion was 0.005%, 15% when 0.01%, and 0.05%
%, 9%, and a good dispersion state was maintained with a small amount of addition.

Example 15 The dispersibility in quinacridone was evaluated in the same manner as in Example 11, except that water-soluble hemicellulose (b) was used instead of water-soluble hemicellulose (b). The syneresis ratio was 15% when the amount of hemicellulose (f) added in the dispersion was 0.005%, and 17% when it was 0.01%.

Comparative Example 11 The dispersibility in quinacridone was evaluated in the same manner as in Example 11, except that water-soluble hemicellulose (b) was used instead of water-soluble hemicellulose (b). Syneresis rate was 25% when the amount of hemicellulose (a) in the dispersion was 0.005%, 18% when 0.01%, and 0.05%
At 16%, the dispersibility of quinacridone was inferior to that of water-soluble hemicellulose hydrolyzed with hemicellulase.

Comparative Example 12 The dispersibility in quinacridone was evaluated in the same manner as in Example 11, except that gum arabic was used instead of water-soluble hemicellulose (b). Even when the amount of gum arabic added was 0.1% in the system, titanium dioxide tended to precipitate over time, and a good dispersion state was not obtained.

Comparative Example 13 The dispersibility in quinacridone was evaluated in the same manner as in Example 11, except that pectin was used instead of water-soluble hemicellulose (b).
Even if the addition amount of pectin is relatively high at 0.1% in the system,
Quinacridone tended to precipitate over time, and a good dispersion was not obtained.

Comparative Example 14 The dispersibility in quinacridone was evaluated in the same manner as in Example 11, except that carrageenan was used instead of water-soluble hemicellulose (b). Syneresis rate is 0.1% of carrageenan added in dispersion
At 10%, 0.05% at 15%, showing a good dispersion state,
The viscosity of the system was high and workability was poor.

Comparative Example 15 Dispersibility in quinacridone was evaluated in the same manner as in Example 11, except that carboxymethylcellulose was used instead of water-soluble hemicellulose (b). Syneresis rate is 19% at 0.05% addition amount of carboxymethylcellulose in the dispersion, 16% at 0.1%
Quinacridone was inferior in dispersibility to water-soluble hemicellulose hydrolyzed by hemicellulase.

The results of the syneresis rate are summarized as follows. In addition, the thing which does not contain a water-soluble polymer was used as a control. ─────────────────────────────────── Syneresis rate (%) ─────────濃度 Water soluble polymer concentration (%) 0 0.005 0.01 0.05 0.1 0.5 ───────────────────── ────────────── Control group 75 Example 11 9.5 8.5 8 6 4 Example 12 10 7 8 8 5 Example 13 13 10 13 6 2 Example 14 14 15 9 8 1 Example Example 15 15 17 13 10 3 Comparative Example 11 25 18 16 14 15 Comparative Example 12 79 76 65 35 18 Comparative Example 13 77 65 38 29 15 Comparative Example 14 70 28 15 10 8 Comparative Example 15 63 27 19 16 11 ─── ────────────────────────────────

[0063]

As described above, by using a hydrolyzate obtained by hydrolyzing water-soluble hemicellulose with hemicellulase, inorganic substances such as titanium dioxide, yellow iron oxide and red iron oxide, and acetoacetic anilide, Azo pigments such as pyrazolone, phthalocyanine pigments such as copper phthalocyanine,
Organic substances such as condensed polycyclic pigments such as anthraquinone and quinacridone can be stably dispersed in an aqueous solution. Therefore, it has become possible to stabilize the dispersion of inorganic and organic substances in a final product such as a paint or a water-based ink for a long time, which has been difficult with conventional dispersants using various water-soluble polymers. In addition, even when the dispersion cannot be completely performed, the formation of a hard cake due to precipitation of inorganic and organic substances is suppressed,
This has the effect of facilitating the redispersion of inorganic and organic substances, and has the effect of improving the workability during industrial use.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuichi Maeda 4-3 Kinokudai, Yawahara-mura, Tsukuba-gun, Ibaraki Pref.

Claims (6)

[Claims] 1. A dispersant for inorganic and organic substances, comprising a hydrolyzate of water-soluble hemicellulose by hemicellulase as an active ingredient. 2. The method of claim 2, wherein the hemicellulase is β-galactosidase, β-galactanase, α-arabinosidase, α-galactosidase.
The dispersant according to claim 1, wherein the dispersant is one or more selected from arabanases, β-xylosidases, β-xylanases, α-glucosidases, α-glucanases, β-glucosidases, and β-glucanases. 3. A method for producing a dispersant for inorganic and organic substances, comprising hydrolyzing water-soluble hemicellulose with hemicellulase. 4. The method of claim 1, wherein the hemicellulase is β-galactosidase, β-galactanase, α-arabinosidase, α-
4. The method according to claim 3, wherein the method is one or more selected from arabanases, β-xylosidases, β-xylanases, α-glucosidases, α-glucanases, β-glucosidases, and β-glucanases. 5. A method for dispersing inorganic and organic substances, comprising using a hydrolyzate obtained by hydrolyzing water-soluble hemicellulose with hemicellulase. 6. The method of claim 5, wherein the hemicellulase is β-galactosidase, β-galactanase, α-arabinosidase, α-galactosidase.
The dispersion method according to claim 5, wherein the dispersion method is one or more kinds selected from arabanases, β-xylosidases, β-xylanases, α-glucosidases, α-glucanases, β-glucosidases, and β-glucanases.