JPS58180208A - Defoaming agent - Google Patents

Abstract

PURPOSE:To provide a defoaming agent which has high safety and provides an excellent defoaming effect by making combination use of fatty acid esters and fatty acid salts. CONSTITUTION:At least 1 kind among a fatty acid ester of sugar, a fatty acid ester of sugar alcohol and fatty acid ester of dehydrated cyclized sugar alcohol is used as the 1st component. Fatty acid salts are used as the 2nd component. Various metallic salts, org. amine salts and basic amino acid salts are used for said salts. A mixture of >=2 kinds may be used as well. In some cases, fatty acid ester of glycerol and/or fatty acid ester of propylene glycol are used in combination as the 3rd component. The ratio of the fatty acid esters and the fatty acid salts to be used is suitably 97:3-3:97 based on weight and the ratio of the 3rd component, when it is used, is about <=1,000wt% based on the total weight of the 1st component and the 2nd component.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to antifoaming agents. More specifically, the present invention relates to an antifoaming agent that has both excellent antifoaming performance and high safety and can be used in various applications such as the paper and pulp industry, the fermentation/food industry, the textile industry, the petroleum industry, the chemical industry, and wastewater treatment.

In many industrial production and treatment processes, the generation of foam causes various troubles, so it is necessary to eliminate the foam that occurs.
In addition, various antifoaming agents are used for the purpose of preventing the generation of foam, and are highly effective in improving production efficiency, improving product quality, and preventing raw material loss.

Conventionally, various compounds such as silicone-based, animal and vegetable oil-based, mineral oil-based, fatty acid-based, fatty acid ester-based, polyether-based, and metal soap-based antifoaming agents have been used, but each has its advantages and disadvantages. Currently, there is no known antifoaming agent that fully satisfies both antifoaming performance and safety, which are the most important requirements.

In view of the current situation, the inventors of the present invention have conducted extensive studies and found that sugar fatty acid esters, sugar alcohol fatty acid esters, and fatty acid esters of dehydrated cyclized sugar alcohols, which have been known as highly safe compounds, have been developed. We have discovered that by using specific fatty acid esters and fatty acid salts in combination, it is possible to exhibit an excellent antifoaming effect that was impossible to achieve when each was used alone, and we have completed the present invention. Ta.

That is, according to the present invention, (1) at least one fatty acid ester selected from the group consisting of sugar fatty acid esters, sugar alcohol fatty acid esters, and fatty acid esters of dehydrated cyclized sugar alcohols; and (B) fatty acid salts are essential. Antifoaming agent containing as an ingredient.

(2) The antifoaming agent according to claim 1, which contains (C) a glycerin fatty acid ester and/or a propylene glycol fatty acid ester as a third component.

(3) The antifoaming agent according to claim 1, wherein the sugar fatty acid ester is a sucrose fatty acid ester.

(4) The antifoaming agent according to claim 1, wherein the 11-alcohol fatty acid ester is nrubitol fatty acid ester.

(5) Fatty acid ester power of a dehydrated cyclized sugar alcohol: The antifoaming agent according to claim 1, which is a nrubitan fatty acid ester.

(6) The antifoaming agent according to claim 1, wherein the fatty acid salt is a fatty acid alkali metal salt.

(7) Alcoholysing at least one hydroxyl group-containing compound selected from the group consisting of sugar, sugar alcohol, and dehydrated cyclized sugar alcohol with glycerin fatty acid ester and/or propylene glycol fatty acid ester in the presence of a base catalyst. Crude pulp product obtained by
or a composition equivalent thereto.

(8) A crude reaction product obtained by alcoholysing at least one hydroxyl group-containing compound selected from the group consisting of sucrose, sorbitol, and sorbitan and oil or fat in the presence of an alkali metal base catalyst, or a crude reaction product thereof. The antifoaming agent according to any one of claims 1 to 7, comprising a composition equivalent to the above.

is provided.

Next, the present invention will be explained in detail.

The (g) fatty acid esters constituting the first component of the antifoaming agent of the present invention include (1) sugar fatty acid ester, (II) sugar alcohol fatty acid ester, and fatty acid ester of U (liD) dehydrated cyclized sugar flucol. At least one fatty acid ester selected from the group is used.

First, (1) sugar fatty acid ester used in the present invention refers to various sugars, namely arabinose, xylose, ribose, lyxose, lJulose, xylulose, glucose (glucose), galactose, sucrose, mannose, fructose (fruit 11 )%: / rubose, tagatose, psicose, maltose (malt 11),
Isomaltose, cellobiose, kenthiobiose, toreno)ose, lactose 1. Ii), sucrose (
It is an ester of sugars and fatty acids represented by sucrose, maltotriose, kentianose, raffinose, stachyose, etc.; It may be a polyester containing an ester bond or a mixture of these monoesters or polyesters.

In particular, sucrose fatty acid esters are industrially produced in large quantities, are easily available, and are relatively inexpensive, so they are one of the sugar fatty acid esters that can be most advantageously used in the present invention. be.

In addition, (11) sugar alcohol fatty acid ester in the present invention refers to various sugar alcohols, i.e., tidolitors such as erythritol and threitol; ribitol;
Pentitols such as arabitol and xylitol; allitol, sorbitol, mannitol, dulcitol,
Hexitols such as ibuitol and altritol; hebutitols such as boremitol, sedoheptitol, and versetitol; esters of sugar alcohols and fatty acids represented by maltitol, lactitol, etc., with the sugar alcohol skeleton retained. Refers to a compound that is connected to a fatty acid skeleton by an ester bond in the state, and as in the case of the sugar fatty acid ester described above, it may be a monoester, a polyester, or a mixture of these monoesters and polyesters.

Among them, nrubitol fatty acid ester is one of the sugar alcohol fatty acid esters that can be most advantageously used in the present invention in terms of availability, price, etc.

Further, in the present invention, 0ii) sugar alcohol dehydrated cyclized product (
Fatty acid esters (also referred to as anhydro sugar alcohols) are Nrubitan, which has a cyclic ether skeleton and is produced by intramolecular dehydration and cyclization of the aforementioned sugars and alcohols.
Refers to esters of dehydrated cyclized sugar alcohols such as mannitan, dulcitan, rubide, mannide, etc. and fatty acids, and as in the case of sugar fatty acid esters and sugar alcohol fatty acid esters, monoesters, polyesters, or mixtures of these monoesters and polyesters. Either is fine. Among the fatty acid esters of sugar alcohol dehydration cyclization products,
Rubitan fatty acid ester is particularly advantageous in terms of availability and price.

In addition, as the fatty acid component constituting the above-mentioned 3. type fatty acid esters, fatty acids having about 6 to 24 carbon atoms are usually suitable. The fatty acid may be either saturated or unsaturated. Further, the carbon chain of the fatty acid is not limited to a straight chain type, but may be a branched type, and furthermore, a fatty acid having a substituent such as a hydroxyl group may be used. Note that the fatty acid is not necessarily limited to monobasic acids, and dibasic acids and the like can also be used.

Typical examples of these fatty acids include caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, lauric acid, tridecanoic acid, 2-methyltetradecanoic acid, 5
-Methyltetradecanoic acid, 2,2-dimethyltetradecanoic acid, myristic acid, palmitic acid, margaric acid, stearic acid, arachidic acid, behenic acid, lignoceric acid,
Examples include oleic acid, elaidic acid, linoleic acid, linuric acid, ricinoleic acid, arachidonic acid, eicosapentaenoic acid, erucic acid, azelaic acid, sebacic acid, and 1°20-eicosameric dicarboxylic acid.

In addition, the above-mentioned sugar fatty acid ester, sugar alcohol fatty acid Nisdel, and fatty acid ester of sugar alcohol dehydrated cyclized product do not necessarily have to be a single product, but the sugar component, sugar alcohol component, and sugar alcohol dehydrated cyclized product component that constitute each fatty acid ester. Two or more types of fatty acid esters having different fatty acid components can also be used alone.

Next, [F] fatty acid salts constituting the second component of the present invention include alkali metal salts such as lithium salts, sodium salts, and potassium salts of fatty acids; alkali metal salts such as magnesium salts, calcium salts, and balaram salts; Earth metal salts: various metal salts such as zinc salts, aluminum salts, iron salts, manganese salts; various organic amine salts such as ammonium salts, monoethanolamine salts, jetanolamine salts, triethanolamine salts; lysine salts, ornithine Salt: Typical examples are basic amino acid salts such as arginine salts and histidine salts, and alkali metal salts and alkaline earth metal salts are most commonly used.

As with the aforementioned fatty acid esters, the above-mentioned fatty acid salts do not necessarily have to be used alone, and a mixture of two or more fatty acid salts with different fatty acid components and anti-cation components can also be used as a single product. Can be used similarly.

In addition, in the present invention, the above-mentioned first component, convict sugar fatty acid ester, sugar alcohol fatty acid ester, and fatty acid ester of a dehydrated cyclized sugar alcohol, and the second component)
In addition to fatty acid salts, in some cases, as a third component (Q
By using a glycerin fatty acid ester and/or a propylene glycol fatty acid ester in combination, it is possible to further enhance the antifoaming power without compromising safety at all. Moreover, various existing antifoaming agents can also be used in combination.

Fatty acid esters and fatty acid salts including these sugar fatty acid esters can be easily produced by known methods, and those produced according to any method can be used in the present invention.

That is, for example, as a method for producing sugar fatty acid ester,
(1) A method in which sugar and a fatty acid lower alkyl ester such as fatty acid methyl ester or fatty acid ethyl ester are rinsed with alcohol using a base catalyst in the presence or absence of a solvent; (2) A method of alcohol rinsing sugar and fatty acid lower alkyl ester such as fatty acid methyl ester or fatty acid ethyl ester using a base catalyst; Typical methods include (3) a method in which sugar is reacted with a fatty acid chloride or a fatty acid anhydride, and (3) a method in which a trifatty acid ester) or a propylene glycol fatty acid ester is rinsed with alcohol in the presence of a base catalyst. .

In particular, methods (1) and (2) contain sugar fatty acid esters and fatty acid salts (usually fatty acid alkali metal salts) in the crude reaction product, so the crude reaction product can be produced at low cost. It is very convenient because it can be used as it is in the present invention without any particular purification. And among them (2)
In this method, in addition to sugar fatty acid esters and fatty acid salts, glycerin fatty acid esters (mono-, di-, and
triesters), or propylene glycol fatty acid esters (mono-triesters).

Since it also contains diester), it is not only economically advantageous, but also particularly advantageous because it provides an antifoaming agent with extremely excellent antifoaming performance.

In addition, in the case of sugar alcohol fatty acid esters or fatty acid esters of dehydrated cyclized sugar alcohols, in addition to methods similar to (1) to (3) above, sugar alcohols or sugar alcohol dehydrated cyclized products and fatty acids may be treated with a base catalyst, Alternatively, a method of direct esterification in the presence of an acid catalyst can also be adopted.

On the other hand, fatty acid salts include fatty acids, fatty acid esters such as fatty acid methyl ester, fatty acid ethyl ester, glycerin fatty acid ester, oxides, hydroxides, carbonates, basic amino acids, ammonia, etc. of alkali metals and alkaline earth metals. It can be easily produced by a method of reacting organic amines, organic amines, etc.

The ratio of (a) fatty acid esters, including sugar fatty acid esters, to (a) fatty acid salts in the antifoaming agent of the present invention is usually 97:3 to 3:97 weight ratio, preferably 95:3 to 5:9. 95 weight ratio, most preferably 90:10 to 10
:90 weight ratio is suitable.

In addition, as a third component (when Q glycerin fatty acid ester and/or propylene glycol fatty acid ester are used together, the total amount is (5) the total amount of fatty acid esters such as sugar fatty acid esters and (6) fatty acid salts). A suitable amount is about 1000% by weight or less.

It should be noted that fatty acid esters and fatty acid salts including sugar fatty acid esters used in the present invention do not necessarily have to be highly purified. Sugars, sugar alcohols, dehydrated cyclized products of sugar alcohols, glycerin fatty acid esters (mono-, di-, and triesters), and fatty acids that partially remain unreacted or may remain during the production of fatty acid esters and fatty acid salts. There is no particular problem even if lower alkyl esters, propylene glycol fatty acid esters (mono- and diesters), fatty acids, and by-products such as glycerin, lower alcohols, propylene glycol, etc. are contained.

The amount of the defoaming agent of the present invention to be used depends on the type of object to be defoamed,
Temperature, pH, viscosity, etc. and the type of foaming substance in the object,
Although it varies depending on the concentration etc. and cannot be strictly defined, the total amount of fatty acid esters such as sugar fatty acid esters and fatty acid salts for the object to be defoamed is usually,
A suitable amount is about 0.0001 to 5% by weight, preferably about 0.001 to 1% by weight.

In addition, when using glycerin fatty acid ester and/or propylene glycol fatty acid ester as the third component, the total usage amount of the first component, second component, and third component can be further reduced from the above value. It is.

The antifoaming agent of the present invention comprises a mixture containing at least fatty acid esters and fatty acid salts in the form of powder, granules, granules,
It may be used as it is in the form of flakes, etc., or it may be diluted with a suitable diluent such as water and prepared into any form such as an aqueous solution, an aqueous suspension, or an aqueous paste. .

When using the antifoaming agent of the present invention, there is a method to prevent foaming by adding the antifoaming agent of the present invention to the object to be defoamed in advance. Any method can be used, such as a method of defoaming by adding the defoaming agent of the invention.

The antifoaming agent of the present invention exhibits a far superior antifoaming effect than when each component is used alone due to the synergistic effect of specific fatty acid esters characterized by sugar fatty acid esters and fatty acid salts. becomes possible. Further, when a glycerin fatty acid ester and/or a propylene glycol fatty acid ester is used in combination as the third component, an even stronger antifoaming effect is exhibited.

Moreover, since each of the components constituting the antifoaming agent of the present invention is highly safe, the antifoaming agent of the present invention has no problems at all in terms of safety.

Therefore, the antifoaming agent of the present invention can be used in various industrial fields such as paper pulp industry, fermentation industry, food industry, textile industry, oil refining industry, petrochemical industry, chemical industry, paint industry, printing ink industry, wastewater treatment, etc. It is possible to improve production efficiency,
It can be effective in improving product quality, reducing raw material and product loss, and preventing pollution.

As detailed above, the antifoaming agent of the present invention has both excellent antifoaming performance and high safety, and therefore has high industrial utility value.

The present invention will be explained in more detail below using Examples and Comparative Examples.

Examples 1 to 8 A 0.25% by weight aqueous solution of saponin, which is known as a highly foaming substance, was prepared, and various antifoaming agents of the present invention (Example 4 and Example 8) were added to the aqueous solution of saponin, which is known as a highly foaming substance. In addition to the first and second components, the third components are glycerin fatty acid ester,
Japanese Industrial Standards J
Measured according to IS K3362 (25℃ or 40℃
The foam height (mm) was measured immediately after foaming and at the edge after 5 minutes. The results are shown in Table 1.

Examples 9 to 12 Sucrose and beef tallow are mixed with alcohol in the presence of a potassium carbonate catalyst.
The crude reaction product corresponding to the antifoaming agent of the present invention obtained by rinsing (containing sucrose fatty acid ester, fatty acid potassium, glycerin fatty acid ester, sucrose, etc.) was treated with saponin as in Examples 1 to 8. The foaming power of a 0.25% by weight aqueous solution was measured in the same manner as in Examples 1 to 8 when the aqueous solution was coexisting at a predetermined concentration. The results are shown in Table 1.

Comparative Examples 1-2 The foaming power of a 0.25% by weight saponin aqueous solution alone was measured in the same manner as in Examples 1-8 without using any antifoaming agent of the present invention. The results are shown in Table 1.

Comparative Example 3 The foaming power of a 0.25% by weight saponin aqueous solution in which only sucrose fatty acid ester (first component) was present was measured in the same manner as in Examples 1 to 8. The results are shown in Table 1.

Comparative Example 4 The foaming power of a 0.25% by weight saponin aqueous solution in which only fatty acid sodium (second component) was present was measured in the same manner as in Examples 1 to 8. The results are shown in Table 1.

Comparative Example 5 The foaming power of a 0.25% by weight saponin aqueous solution in which only the glycerin fatty acid ester (third component) was present was measured in the same manner as in Examples 1 to 8. The results are shown in Table 1.

Comparative Example 6 The foaming power of a 0.25% by weight saponin aqueous solution in which only the nrubitan fatty acid ester (first component) was allowed to coexist was measured in the same manner as in Examples 1 to 8. The results are shown in Table 1.

Claims (8)

[Claims] (1) Contains as essential components at least one fatty acid ester selected from the group consisting of (A) sugar fatty acid ester, sugar alcohol fatty acid ester, and fatty acid ester of dehydrated cyclized sugar alcohol; and (6) fatty acid salts. An antifoaming agent made of (2) The antifoaming agent according to claim 1, comprising (q) glycerin fatty acid ester and/or propylene glycol fatty acid ester as the third component. (3) The antifoaming agent according to claim 1, wherein the sugar fatty acid ester is a sucrose fatty acid ester. (4) The antifoaming agent according to claim 1, wherein the sugar alcohol fatty acid ester is a sorbitol fatty acid ester. (5) The antifoaming agent according to claim 1, wherein the fatty acid ester of the dehydrated cyclized sugar alcohol is nlupitan fatty acid ester. (6) The antifoaming agent according to claim 1, wherein the fatty acid salt is a fatty acid alkali metal salt. (7) At least one hydroxyl group-containing compound selected from the group consisting of sugars, sugar alcohols, and dehydrated cyclized sugar alcohols and glycerin fatty acid ester and/or propylene glycol fatty acid ester are rinsed with alcohol in the presence of a base catalyst. The antifoaming agent according to claim 1 or 2, which contains a crude reaction product obtained by this method, or a composition equivalent thereto. (8) A crude reaction product obtained by alcohol rinsing at least one hydroxyl group-containing compound selected from the group consisting of sucrose, sorbitol, and sorbitan and oil in the presence of an alkali metal base catalyst, or The antifoaming agent according to any one of claims 1 to 7, which contains a composition equivalent to this.