JPH02157032A - Mixture for stabilizing aqueous composition - Google Patents

Abstract

PURPOSE:To improve resistance and stability to heat, acid resistance and alkali resistance of an aqueous composition by mixing the predetermined amounts of heteropolysaccharide S-194 and xanthane gum to prepare a stabilizer for the aqueous composition. CONSTITUTION:Heteropolysaccharide S-194 and xanthane gum are added, with mixing, to an aqueous composition such as flocculant used in mining, manufacturing and water treatment industries to obtain a stabilized aqueous composition. Preferably, the heteropolysaccharide S-194 of 5 - 95% and the xanthane gum of 95 - 5% are mixed together. The use of such mixture improves resistance and stability to heat, acid resistance and alkali resistance, decreases spinnability, and increases thixotropy, although the synergetic effect of the apparent viscosity is not observed.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a mixture for stabilizing an aqueous composition comprising heteropolysaccharide S-194 and xanthan gum, a stabilized aqueous composition, and a method for stabilizing an aqueous composition. Regarding the method. The mixture and stabilization method of the present invention are useful in industrial fields where properties such as thickening, turbidity, emulsification, stabilization, binding, and gelation are required, particularly in paints, cleaners, and agricultural chemicals.

Suitable for use in fields such as textiles.

[Conventional technology and its problems]

Xanthan gum is made from pure cultured microorganism Xanthomonas campestris (Xan thomonas Ca
mpestris) is an anionic polymeric polysaccharide that accumulates outside the bacterial cells during the fermentation process. Its constituent monosaccharide and composition ratio are glucose: mannose: glucuronic acid = 2:
2:1. Xanthan gum exhibits a pseudo-positive high viscosity compared to other polysaccharides, exhibiting thickening properties, high suspension stability, 80-20% qualitative and special rheological properties, It has been used in the field.

However, depending on the system, the thickening properties of xanthan gum,
@turbidity stability may be insufficient.

Also, xanthan gum is unstable to heat. Due to these drawbacks, there are some fields in which xanthan gum is not applicable.

On the other hand, heteropolysaccharide S-194 is
As detailed in the publication, pure culture microorganism Alcaligenes A
TCC31961 is an anionic polymeric polysaccharide that accumulates outside the bacterial cells during the fermentation process.

Its constituent monosaccharide and composition ratio are glucose:rhamnose:
Glucuronic acid = 4:1:1. Heteropolysaccharide S-19
4 exhibits extremely pseudoplastic high viscosity compared to xanthan gum, exhibiting thickening properties, high suspension stability, and special rheological properties, and has superior thermal, shear, and enzyme stability compared to xanthan gum. There is. Therefore,
It is expected that it will be used more widely than xanthan gum.

However, since heteropolysaccharide S-194 also has various drawbacks, there are many fields in which it cannot be applied. For example, when the heteropolysaccharide S-194 is stored at high temperatures, the viscosity of the system increases significantly, and the viscosity of the system changes significantly.The viscosity also appears to increase in acid/alkaline solutions, and the stringiness is very large.

[Means to solve the problem]

The present inventors have discovered that xanthan gum and heteropolysaccharide S-194
We have completed the present invention by discovering that by using these in combination, the above-mentioned drawbacks can be improved and more effective than expected can be obtained.

The present invention relates to a mixture for stabilizing an aqueous composition comprising heteropolysaccharide S-194 and xanthan gum, a stabilized aqueous composition, and a method for stabilizing an aqueous composition.

By using heteropolysaccharide S-194 and xanthan gum together, although there is no apparent synergistic effect on viscosity, the heat stability, acid resistance, and alkali resistance are good, and the stringiness is small. , the thixotropy becomes large.

In the present invention, heteropolysaccharide S-194 and xanthan gum are preferably heteropolysaccharide 5194.5-95% and xanthan gum, 95-5%, particularly preferably heteropolysaccharide S-194, 20-80% and xanthan gum, 80-
It is used at a rate of 20%.

A mixture of heteropolysaccharide S-194 and xanthan gum may be prepared in advance and used, or each may be added at the time of preparing the aqueous composition. Moreover, in either case, it may be used in a dry powder state or in a liquid state. Additionally, mixtures may be prepared in combination with other ingredients.

[Effect]

The mixture of heteropolysaccharide S-194 and xanthan gum of the present invention can be used in various industrial fields where properties such as concentration, suspension, emulsification, stabilization, binding, and gelation are required. For example, flocculants and precipitants in the mining and water treatment industries, coating and sizing additives in the paper industry, and additives and gelling agents for slurry blasting straw.

Binders for tobacco, suspensions and emulsifiers for cosmetics and pharmaceuticals2 Additives for mortar and cement, additives for polishing and extrusion molding of ceramics, glue, additives for cleaners and polishing, emulsifiers and suspending agents for latex emulsions, Suspending agents and granulating aids for flowable formulations in the agrochemical industry, suspending agents for liquid fertilizers, additives for paints, water-based inks, and phosphorus, suspending agents and thickening stabilizers for dyes and pigments 1 Stable for coal-water slurries Agent 1 is used as a polling slurry agent for oil drilling (etc.), an additive for heat storage and cold storage agents, etc. Naturally, it is not limited to those listed above.

The mixture of the present invention can be particularly suitably used in the fields of paints, cleaners, and agrochemical fibers.

〔Example〕

The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited thereto. The viscosity was measured using a BL type Prufuku field viscometer (manufactured by Tokyo Keiki Seisakusho) at 25°C and 60 rpm.

(Leaving space below) Example 1 Thermal stability test Dry powders of heteropolysaccharide S-194 (NIA112, manufactured by Kelco) and xanthan gum (Kelsan 0, manufactured by Kelco 3) were blended in the ratio shown in Table 1. Various heteropolysaccharides S-
A mixture of 194 and xanthan gum was prepared and thermal stability tests were conducted.

Prepare a 0.5% distilled aqueous solution of the above mixture, leave it overnight, measure the viscosity (initial viscosity) of each, store it in a thermostat at 50°C for one month, and then measure the viscosity again. The viscosity change was investigated.

The results are shown in Table 1. The composition of the present invention showed little change in viscosity after storage and had excellent thermal stability.

Table 1 Thermal stability test Example 2 Alkali resistance test pH was adjusted using sodium hydroxide instead of distilled aqueous solution.
A thermal stability test was conducted in the same manner as in Example 1, except that a distilled aqueous solution prepared in 11.8 was used.

The results are shown in Table 2. The composition of the present invention showed little change in viscosity and had excellent alkali resistance.

Table 2 Alkali Resistance Test Example 3 Acid Resistance Test Thermal stability was tested in the same manner as in Example 1 except that a distilled aqueous solution whose pH was adjusted to 2.5 using concentrated hydrochloric acid was used instead of the distilled aqueous solution. I conducted a test.

The results are shown in Table 3. The composition of the present invention showed little change in viscosity and had excellent acid resistance.

Table 3 Acid resistance test (hereinafter referred to as blank space) (hereinafter referred to as blank space) Example 4 Threadability test After preparing by the method of Example 1, the string lengths of aqueous solutions of various mixtures that were prepared overnight were measured.

The string length was measured using a rheometer manufactured by City Tram at 25°C, at a speed of I n+n/1 sec, and a contact surface diameter of 10
I went to I.

The results are shown in Table 4. The string length of the composition of the present invention was smaller than the theoretical value.

Example 5 Thixotropy Test The aqueous solutions of various mixtures prepared in Example 1 and left overnight were subjected to a thixotropy test in the following manner.

The viscosity was measured at 6 rpm and 6 Orpm at 25°C using a new BL type Brookfield viscosity needle manufactured by Tokyo Keiki Seisakusho, and the ratio (thixoscopic coefficient: viscosity at 6rppA/60rpm
viscosity) was investigated. The larger the thixoscopic coefficient, the stronger the pseudoplasticity.

The results are shown in Table 5. The thixotropy of the composition of the invention was greater than the theoretical value.

(The following is a blank space) Example 6 I Heteropolysaccharide S-19411A112. A paint was prepared according to the following composition using a 50:50 mixture of dry powders of dry powders of Kelco Co., Ltd.) and xanthan gum (Kelzan [Phase], made by Kelco Co., Ltd.) in a ratio of 50:50.

Ingredients - U dispersant Tamol @ 731 4.5 (manufactured by Rohm and Haas) Dispersant Triton @ X-1002,2 (manufactured by Rohm and Haas) Ethylene glycol 18.7 Texanol @ 5.6 (Easman Chemical) Tybake @ R-550112,1 (manufactured by Ishihara Sangyo Co., Ltd.) Calcium carbonate MS-100112,1 (Nitto Funka Kogyo Co., Ltd.) Zinc oxide 56.0 Silicon oxide 74.7 Invention dry powdered rice mixture (50:50) 3.3 Brimar @ AC
-38218L9 (manufactured by Nippon Acrylic Co., Ltd.) Celite 281 (manufactured by Manville) 74.7 Preservative Proxel @ CRL C0 (T, C,
Manufactured by Company I) Cable meter
The thermal stability test of Example 1 was conducted on the paint thus prepared. As a result, the viscosity did not increase even after storage for -month, and the viscosity was the same as that at the time of preparation. On the other hand, the paint prepared using heteropolysaccharide 5194 with the above composition increased in viscosity significantly, and the viscosity significantly changed compared to when it was prepared. Furthermore, it was applied to a slate board using a spray gun (6 mm diameter, 3 atm), and its adhesion was also examined.

As a result, the paint using the mixture of the present invention could be applied in a uniform pattern. On the other hand, hetero multi-WS-19
The paint using No. 4 had strong stringiness and was applied in a spider web pattern, making it impossible to obtain a uniform pattern.

Example 7 Cleaner heteropolysaccharide S-194N (IA112. Manufactured by Kelco)
A cleaner was prepared according to the following composition using a mixture of dry powder and xanthan gum (manufactured by Kelsan 0 and Kelsan 3) in a ratio of 50:50.

Ingredients -jLLt Upper abrasive diatomaceous earth 15.0 Abrasive aluminum silica 2.0 Activator Triton@X-1025
,0 (manufactured by Rohm and Haas) Dry powder mixture of the present invention (50:50) 0.3 Preservative Proxel @ CRL O,7 (1,
C, made by 1 company) Pigments, fragrances (approx. 10 meters)
100 Regarding the cleaner thus prepared,
A thermal stability test was conducted in the same manner as in Example 1. As a result, the same results as the paint of Example 6 were obtained.

That is, the viscosity did not increase even after storage, and the viscosity was the same as that at the time of preparation. On the other hand, the cleaner prepared using only the heteropolysaccharide S-194 with the above composition increased in viscosity significantly and the viscosity changed significantly compared to when it was prepared, resulting in strong stringiness and very poor workability. .

Example 8 Flowable pesticide formulation heteropolysaccharide S-194 (KIA112. manufactured by Kelco)
A flowable agricultural chemical formulation was prepared using a mixture of dry powders of xanthan gum and xanthan gum (Kelzan 01 manufactured by Kelco) in a ratio of 50:50 according to the following composition.

Ingredients -1'' Agricultural chemical raw material Malathion 40.0 Ethylene glycol 5.0 Activator Agelisil 6
B-71010,0 (manufactured by Kao Corporation) Dry powder mixture of the present invention (50:50) 0.3 Preservative Proxel @ CRL O,05N,
C, manufactured by 1 company) Cable meter
100 Thermal stability test was conducted in the same manner as in Example 1 for the flowable pesticide formulation thus prepared. As a result, the same results as the paint of Example 6 were obtained. That is, -
The viscosity did not increase even after Otsuki storage, and the viscosity was the same as that at the time of preparation. On the other hand, the flowable agricultural chemical formulation prepared using only heteropolysaccharide S-194 had extremely thickened viscosity, and the viscosity was significantly changed compared to when it was made from W4, resulting in very poor workability.

Example 9 Liquid dye heteropolysaccharide S-19411A112 for textile dyeing. A liquid dye was prepared according to the following composition using a 50:50 mixture of dry powder of xanthan gum (KELZAN [Phase], manufactured by Kelco) and xanthan gum (KELZAN [Phase], manufactured by Kelco).

Ingredients -jLLL Top Disperse Dye Sumikaron [Phase] Navy 10.0 Blue 5-2GL
200χ (manufactured by Sumitomo Chemical Co., Ltd.) (Kao Corporation) Dry powder mixture of the present invention (50:50) 0.3 cable meter
100 Thermal stability test was conducted in the same manner as in Example 1 for the liquid dye for dyeing textiles thus prepared. As a result, the same results as the paint of Example 6 were obtained. That is, -
The viscosity did not increase even after Otsuki storage, and the viscosity was the same as that at the time of preparation. On the other hand, a liquid dye for dyeing textiles using only heteropolysaccharide S-194 had a large increase in viscosity and a significant change in viscosity, resulting in very poor workability.

Patent applicant: Dainippon Pharmaceutical Co., Ltd.

Claims (5)

[Claims] (1) A mixture for stabilizing an aqueous composition comprising heteropolysaccharide S-194 and xanthan gum. (2) A mixture for stabilizing an aqueous composition according to claim 1, comprising 20-80% of heteropolysaccharide S-194 and 80-20% of xanthan gum. (3) A stabilized aqueous composition containing heteropolysaccharide S-194 and xanthan gum. (4) A method for stabilizing an aqueous composition, characterized by using heteropolysaccharide S-194 and xanthan gum. (5) A method for stabilizing an aqueous composition according to claim 4, characterized in that heteropolysaccharide S-194 and xanthan gum are used in the following proportions. Heteropolysaccharide S-194, 20-80% Xanthan gum, 80-20%