JPH0680997A - Lowly foaming alkali detergent - Google Patents

Abstract

PURPOSE:To provide a water-based, lowly foaming detergent which is a stable liquid comparable to a chlorinated solvent in degreasing and penetrating power. CONSTITUTION:The detergent comprises 1-40wt.% alkali salt and/or hydrate thereof, 1-10wt.% nonionic surfactant consisting of an ethylene oxide adduct of nonylphenol and/or octylphenol, the ethylene oxide amount being 1-5mol on the average per mol of the phenol, 1-10wt.% nonionic surfactant consisting of an ethylene oxide adduct of nonylphenol and 1 or octylphenol, the ethylene oxide amount being 6-15mol on the average per mol of the phenol, 1-10% nonionic surfactant consisting of an adduct of ethylene oxide and propylene oxide with a 10-16C aliphatic alcohol, 1-10wt.% 6-12C aliphatic carboxylic acid, and water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to metals, ceramics,
The present invention relates to a water-based cleaning agent used for degreasing cleaning of glass, plastic and the like.

[0002]

2. Description of the Related Art Conventionally, as industrial degreasing detergents for metals, ceramics, glass, plastics, etc., water-based detergents represented by alkali detergents and solvent-based detergents represented by 1,1,1-trichloroethane. A cleaning agent is used.

Alkali detergents include nonionic surfactants typified by polyoxyethylene alkylphenyl ethers, anionic surfactants typified by sodium alkylbenzenesulfonate, sodium carbonate, sodium silicate, and borosurfactants. Alkali salts such as sodium phosphate, sodium phosphate, sodium hydroxide, potassium hydroxide, sodium tripolyphosphate, EDTA, NTA,
A chelating agent such as gluconate, benzotriazole, amines, alkanolamines, rust preventives such as sodium nitrite, and the like are appropriately mixed. Its composition is
For example, Tsuji recommendation "Precision cleaning technology" engineering book p117-
120, "Precision Cleaning Technology Manual" edited by Tsuji recommended, New Technology Development Center, p50-56, various articles have been proposed according to the article to be cleaned, metal, and dirt. However, since the degreasing power and penetrating power are inferior to chlorine-based solvents such as 1,1,1-trichloroethane, practical application fields are cleaning of articles having a simple structure and residual oil content after cleaning. Most of the fields are not so important.

On the other hand, chlorine-based solvents such as 1,1,1-trichloroethane have excellent degreasing and penetrating powers and can be applied to all kinds of degreasing such as cutting oil, drawing oil and press oil.
It is used in the field of cleaning articles with complex structures and precision parts that require high cleanliness. However, in recent years, environmental problems such as groundwater pollution, air pollution, and ozone layer depletion due to chlorine-based solvents have become prominent, and in the industrial world, conventional alkaline cleaners have been applied as alternative cleaners. I am doing it.

[0005]

However, the conventional alkaline cleaners are inferior in degreasing power and penetrating power to chlorine-based solvents, and especially when cutting oil, drawing oil, high-viscosity press oil, etc. It cannot be applied to the case where it adheres to the details or the case where a very small amount of residual oil on the surface of the component is a problem. In addition, it is possible to use a large amount of nonionic surfactant in order to increase the degreasing power and penetrating power, but it becomes difficult to make a stable liquid product as a product in the coexistence with an alkali salt. There are problems such as increasing the number.

Further, it is considered that the amount of alkali salt is increased to increase the pH in order to enhance the degreasing power, but this also makes it difficult to form a stable liquid state as a product. Although foaming can be suppressed by heating in some cases, it is difficult to suppress foaming at room temperature of about 20 ° C. As a stable liquid method, for example, Japanese Patent Publication No. 63-13
As shown in 480, there is a method of using sodium aromatic carboxylate, but sodium paratertiarybutyl benzoate, which is used as a representative of sodium aromatic carboxylate, has a problem that it is highly toxic to the kidney and the liver. .

[0007]

As a result of intensive studies, the present inventors have found that the above problems can be solved by combining an alkali salt with a specific nonionic surfactant and an aliphatic carboxylic acid. Has been completed. That is, the present invention provides at least (1) an alkali salt and / or a hydrate thereof 1 to 40
% By weight (2) Nonionic surfactant having nonylphenol and / or octylphenol with an average ethylene oxide addition mole number of 1 to 5 moles 1 to 10% by weight (3) Nonylphenol and / or octylphenol having an average ethylene oxide addition mole number 6 to 15
Molar nonionic surfactant 1 to 10% by weight (4) Nonionic surfactant which is an ethylene oxide and propylene oxide adduct of an aliphatic alcohol having 10 to 16 carbon atoms 1 to 10% by weight (5) 6 carbon atoms -12 is an aliphatic carboxylic acid 1-10 wt% (6) A low-foaming alkaline cleaner comprising water.

The alkali salt and / or its hydrate used in the present invention include, for example, anhydrous salts such as sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium borate, sodium phosphate, and the like. A hydrate is mentioned. The blending amount is 1 to 40% by weight. If it is less than 1% by weight, the degreasing power will be poor, and
When it exceeds 0% by weight, it is difficult to maintain a stable liquid state, which is not preferable.

As the surfactant, 1 to 10% by weight of nonylphenol and / or octylphenol, a nonionic surfactant (hereinafter referred to as surfactant A) having an average ethylene oxide addition mole number of 1 to 5 moles, and Nonionic surfactant (hereinafter referred to as surfactant B) having an average number of moles of added ethylene oxide of nonylphenol and / or octylphenol of 6 to 15 mol 1
Nonionic surfactants which are ethylene oxide and propylene oxide adducts of -10 wt% and aliphatic alcohols having 10 to 16 carbon atoms (hereinafter Surfactant C
1) to 10% by weight in combination. By combining these three surfactants, the degreasing power and penetrating power can be increased and the foaming can be reduced.

It is difficult to maintain a stable liquid state with only the surfactant A, a lot of foaming occurs only with the surfactant B, and the degreasing power is low with the surfactant C alone, which is not preferable. Combination of surfactants A and B, surfactants B and C
The combination of Nos. 1 and 2 often causes foaming at room temperature, and the combination of the surfactants A and C is difficult to maintain in a stable liquid state, which is not preferable.

The aliphatic carboxylic acid having 6 to 12 carbon atoms is an essential component for keeping the detergent of the present invention in a stable liquid state in a wide temperature range from a low temperature of 0 ° C. or lower to a high temperature of 50 ° C. or higher. In the present invention, 1 to 10% by weight is used. Examples of this are hexanoic acid, heptanoic acid, octanoic acid, 2-ethylhexanoic acid, nonanoic acid, 3,5,5-
Examples thereof include trimethylhexanoic acid, decanoic acid, undecanoic acid, dodecanoic acid and the like. When the carbon number is less than 6, unpleasant odor becomes strong, and when it is more than 12, foaming becomes large, which is not preferable. If the amount added is less than 1% by weight, it will be difficult to maintain a stable liquid state, and if it is more than 10% by weight, the degreasing power will decrease, which is not preferable.

Water is used as a solvent for forming a uniform liquid product of an active ingredient of a detergent such as an alkali salt, a surfactant and an aliphatic carboxylic acid. The amount thereof is determined so that the total amount of the active ingredient of the detergent and the additives described below and the water is 100% by weight. When the cleaning agent of the present invention is used in the actual cleaning step, it is further diluted with water before use. The concentration of the active ingredient of the detergent at that time is usually 0.05 to 5% by weight.
Is. The concentration of the active ingredient of the cleaning agent is appropriately adjusted depending on the conditions such as the cleaning method, the cleaning article and the stain.

In the present invention, other surfactants,
Known additives such as sodium gluconate, ED
It is also possible to appropriately mix and use a chelating agent such as TA and NTA, a benzotriazole, amines, a corrosion inhibitor such as nitrite, a defoaming agent, and a solvent such as alcohol, glycol and glycol ether.

[0014]

The present invention will be described with reference to the following examples. Examples 1 to 4 and Comparative Examples 1 to 2 The cleaning agents shown in Table 1 were blended and the following tests were conducted. The results are shown in Table 2. (1) Degreasing Power and Penetration Test A 30-mesh stainless wire net (60 × 30 mm) was impregnated with the following metalworking oil and heated at 100 ° C. for 30 minutes.
This was washed with a 3% by weight aqueous solution of a cleaning agent, and the degreasing rate was calculated from the attached oil content before and after washing by the following mathematical formula 1, and 1, 1, 1
-Comparison with degreasing with trichloroethane. Metalworking oil used in the test Cutting oil: Unicut GH35 (trade name, manufactured by Nippon Oil Co., Ltd.) Press oil: Unipress DP120 (trade name, manufactured by Nippon Oil Co., Ltd.) (2) Stability test The temperature was maintained at 30 ° C and 60 ° C, and it was observed whether the active ingredient of the detergent was separated or precipitated. (3) Foaming test 50 ml of a detergent diluted with water to 3% by weight was placed in a 100 ml graduated cylinder, shaken vigorously and allowed to stand, and the height of foaming was measured.

[0015]

[Equation 1]

[0016]

[Table 1]

The numbers in the table represent% by weight. 1) Alkali salt, hydrate a1: Sodium metasilicate-9-hydrate 〃 a2: Sodium carbonate anhydrous 2) Surfactant A b1: Ethylene oxide 2 mol adduct of nonyl phenyl ether 〃 b2: Ethylene oxide 4 mol of octyl phenyl ether Adduct 3) Surfactant B c1: Nonyl phenyl ether ethylene oxide 10 mol adduct 〃 c2: Octyl phenyl ether ethylene oxide 8 mol adduct 4) Surfactant C d1: Pepol ASO54C (trade name, Toho Chemical Industry Co., Ltd. 〃 d2: Softanol EP7085 (trade name, manufactured by Nippon Shokubai Chemical Co., Ltd.) 5) Aliphatic carboxylic acid e1: Nonanoic acid 〃 e2: 3,5,5-Trimethylhexanoic acid

[0018]

[Table 2] 1) When the degreasing rate is equivalent to degreasing with 1,1,1-trichloroethane; 〇 when inferior; × 2) when there is no change; 〇 when precipitation and separation are observed; × 3) foaming is less than 20 mm; 〇 20 mm or more; ×

[0019]

The cleaning agent of the present invention is an excellent cleaning agent having degreasing power and penetrating power comparable to that of a chlorine-based solvent, less foaming, and a stable liquid state.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location C11D 7:14 7:12 7:26) (72) Inventor Ryoji Kaneda 1 Yoshiyukizaka, Fujisawa City, Kanagawa Prefecture −14−25 (72) Inventor Takashi Tokuue 97-6 Sawamachi, Asahi Ward, Yokohama City, Kanagawa Prefecture

Claims (1)

[Claims] 1. At least (1) an alkali salt and / or a hydrate thereof 1-40
% By weight (2) Nonionic surfactant having nonylphenol and / or octylphenol with an average ethylene oxide addition mole number of 1 to 5 moles 1 to 10% by weight (3) Nonylphenol and / or octylphenol having an average ethylene oxide addition mole number 6 to 15
Molar nonionic surfactant 1 to 10% by weight (4) Nonionic surfactant which is an ethylene oxide and propylene oxide adduct of an aliphatic alcohol having 10 to 16 carbon atoms 1 to 10% by weight (5) 6 carbon atoms -12 aliphatic carboxylic acid 1-10 wt% (6) A low-foaming alkaline cleaner comprising water.