JPS5837354B2 - Exhaust food collection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel liquid detergent composition containing a water-soluble salt of an acylated condensed oxyacid and having excellent long-term storage stability at high temperatures.

Acylated condensed oxyacid salts have excellent biodegradability, and especially when used as alkali metal salts or cobalt salts, they have excellent detergency and surface activity against oily substances, so they are suitable for application in detergents. Various proposals have been made.

However, acylated condensed oxyacid salts are chemically unstable, and their ester bonds are easily hydrolyzed in aqueous solutions, and transesterification occurs in alcoholic solutions such as ethanol, propylene glycol, and glycerin. A practically satisfactory liquid cleaning agent with excellent long-term storage stability has not yet been obtained.

The present invention provides a liquid detergent composition which minimizes the decomposition of acylated condensed oxyacid salts and has excellent long-term storage stability even under high temperatures. However, R is C5-1
9 is a straight chain or branched chain saturated or unsaturated hydrocarbon group, R' is H, CH3 or C2H5, and n is an integer of 1 or more.

) A liquid cleaning composition comprising a salt of an acylated condensed oxyacid as a main component, characterized in that dipropylene glycol diacetate or polypropylene glycol is used as a solvent. It is.

The raw fatty acids for producing the salt of the acylated condensed oxyacid represented by the above general formula used in the liquid detergent composition of the present invention include C6-2o linear or branched saturated or unsaturated fatty acids. Suitable fatty acids include fatty acids obtained from natural fats and oils, fatty acids produced from olefins and carbon monoxide by the oxo process, etc., fatty acids produced by air oxidation of paraffin, and the like.

These fatty acids include, for example, cabroic acid, caprylic acid, lauric acid, myristic acid, palmitic acid, stearic acid,
Alagic acid, oleic acid, α-methyldodecanoic acid, α-
Examples include methyltridecanoic acid, α-methyltetradecanoic acid, α-methylheptadecanoic acid, and the like, and these are used alone or as a mixture.

Particularly preferred are fatty acids in which 70% by weight or more of the fatty acids are C1 to C15.

Other components of the acylated condensed oxyacid salts, alpha-oxycarboxylic acids, include glycolic acid, lactic acid, and alpha-hydroxybutyric acid.

α-O again? The number n of condensed moles of dicarboxylic acid greatly affects the detergency, and shows the highest detergency when n is 2 to 4.
The cleaning power gradually decreases as n increases.

Therefore, when the acylated condensed oxyacid salt is used alone, it is suitable that n is 2 to 6, and when it is used as a mixture, the average number of condensed moles (100) is suitably 1.7 to 6.5. .

Since the solubility in the solvent used in the present invention is not very good when n is less than 1, n is about 2.5 or more in order to obtain a homogeneous and transparent solution.

In addition, when a method is used in which a portion is dispersed or solubilized, a preferable cleaning composition can be obtained even when n is 2.5 or less.

Preferably, the acylated condensed oxyacid salt with n of 2 to 6 is 50
Contains more than % by weight.

Even if n is a calcium or cobalt salt, the acylated condensed oxyacid salt has relatively low detergency and poor solubility in the solvent of the present invention, so it cannot be used alone, but if 70% by weight or more As long as n is 2 or more, an acylated condensed oxyacid salt in which n is 1 may be included.

These acylated condensed oxyacids are used as salts of alkali metals such as sodium and potassium, alkali metals such as calcium, magnesium and barium, and cobalt.

Since acylated condensed oxyacids have detergency when they are divalent metal salts, they do not require polyvalent metal ion sequestering agents such as chelating agents, so when using ordinary natural water for cleaning,
Sodium and potassium salts with good solubility in solvents are preferred.

It is assumed that the presence of polyvalent metal ions in the cleaning aqueous solution of acylated condensed oxyacids produces undissociated or partially undissociated polyvalent metal salts, which exhibit excellent cleaning power. .

Therefore, if a sufficient amount of polyvalent metal ions is present in the cleaning solution to produce a desired amount of undissociated polyvalent metal salts, then whether those polyvalent ions are present in hard water or not, the composition It gives the same effect regardless of the ions added to it.

The appropriate amount of the acylated condensed oxyacid to be used is 5 to 95% by weight, preferably 30 to 95% by weight from the viewpoint of liquid properties and economical efficiency.
It is 80% by weight.

Sodium and potassium salts of acylated condensed oxyacids are pasty to semisolid at room temperature and exhibit excellent solubility in water and various organic solvents.

On the other hand, since alkaline earth metal and cobalt salts have poor solubility, it is not preferable to use them alone, and they are used in combination with alkali metal salts.

The conditions required for a solvent to liquefy an acylated condensed oxyacid are that it does not react with the acylated condensed oxyacid during long-term storage at high temperatures, does not reduce its performance, is water-soluble, and has low volatility. , low solvent odor and high safety.

A feature of the present invention is that dipropylene glycol diacetate and polypropylene glycol are used as solvents that satisfy these conditions.

The average molecular weight of polypropylene glycol is approximately 600-1
800, preferably about 800 to 1500 from the viewpoint of reactivity and water solubility.

If the average molecular weight is less than 600, the transesterification reaction with the acylated condensed oxyacid will gradually proceed during long-term storage, and if it is more than 1,800, the water solubility is poor and it acts as an oily stain in the washing water, resulting in a decrease in cleaning power. It's not appropriate.

Although the liquid detergent composition of the present invention has various advantages because it is a liquid, it also has the disadvantage that hydrolysis reactions easily occur during storage.

Hydrolysis tends to break the ester bonds near the terminals, so the effect on detergency can be minimized by increasing the condensation number n a little, but this acylated condensed oxyacid has almost no detergency in the acidic region, so In order to reduce the influence of acid generated by hydrolysis, it is preferable that the amount of free water is as small as possible.

In the present invention, it is desirable that the amount of free water per mole of ester bond in the acylated condensed oxyacid is 0.5 mole or less.

In particular, when the material is to be stored for a long period of time at a high temperature, for example, 50° C. or higher, the free water content is preferably 0.3 mol or less.

Another way to reduce the effects of free water is alkaline pH.
One method is to use a regulator.

This alkaline pH adjuster neutralizes the acid generated by hydrolysis and maintains the pH constant, thereby preventing a decrease in detergency.

The alkaline pH adjuster here refers to the pH of a 1% aqueous solution.
is a salt of a weak acid and a strong alkali, a salt of a weak acid and a weak alkali, and a mixture of these salts and an acid or an alkali, in which the pH value is 6 to 9.8.

Examples include sodium carbonate, sodium bicarbonate, potassium bicarbonate, sodium phosphate, sodium borate, sodium glycolate, sodium lactate, potassium lactate, sodium malate, potassium malate, sodium citrate, and the like.

Also included are mixtures of these salts and their constituent acids.

Since most of the acylated condensed oxyacid salts are in the acid form under acidic conditions, they exhibit almost no detergency.

Therefore, it is necessary to adjust the pH of the cleaning solution in which the Kumi-Kaimono of the present invention is dissolved to about 6 or more, and the pH may be adjusted by separately adding an alkaline substance, but the
It is preferable to adjust the pH of the % aqueous solution in advance to 6 or more.

If the composition contains water, some of the ester bonds will be hydrolyzed and acid will be produced, which will lower the pH. It is desirable to determine the amount of pH adjusting agent.

The present invention will be specifically explained below with reference to Examples.

Note that the detergency test was conducted using the Linerutz method.

Rinatsu method* * 120 to 130 m9 of fat mixed with beef tallow and soybean oil at a weight ratio of 1=1 is deposited on a slide glass as a stain.

A set of 6 slide glasses were fixed in a holder, and stirred and washed from the center of the holder using a constant speed motor of 25 O rpm in a 700 ml solution with an active agent concentration of 0.05% and a temperature of 25°C. .

The cleaning power is expressed as the removal rate of attached dirt based on the weight of the glass slide before and after cleaning.

Example 1 Lauric acid condensed lactic acid having an average condensation number of lactic acid n=3.4 was dissolved in acetone, and a 50% NaOH aqueous solution was added dropwise to neutralize the solution.

Acetone and water were distilled off under reduced pressure to obtain lauric acid condensed lactate sodium salt in the form of a pale yellow opaque grease containing 0.2% water.

Various solvent solutions with a concentration of 40% were prepared using this, and the solutions were placed in glass bottles and stored tightly at 50° C. for 15 days, after which the detergency and pH were measured.

The results are shown in Table-1.

Example 2 Lauric acid condensed lactate sodium salt of Example 1 (n=3.
4) was dissolved in various polypropylene glycols having different average molecular weights Mw to a concentration of 40% and measured under the same conditions.

The results are shown in Table-2. Example 3 60% dipropylene glycol diacetate solutions of lauric acid condensed lactate potassium salts having different average condensation numbers n were prepared, and their properties and detergency were measured.

The results are shown in Table-3.

Example 4 A liquid cleaning agent having the composition shown in Table 4 was prepared, and after being stored tightly at ℃ for 30 days, the cleaning power was measured at 50℃.

Claims (1)

[Scope of Claims] 1 General formula (wherein R is a C5-19 linear or branched saturated or unsaturated hydrocarbon group, R' is H, CH3 or C2H
5 and n represent an integer of 1 or more. ) A liquid cleaning composition comprising a salt of an acylated condensed oxyacid as a main component, characterized in that dipropylene glycol diacetate or polypropylene glycol is used as a solvent.