JPH03126796A - Liquid detergent composition - Google Patents

Abstract

PURPOSE:To provide the subject composition containing a specific nonionic surfactant and ethanolamine at a specific ratio, free from residual alkali metal salt, having low frothing tendency and suitable as a detergent for dust-free wear to be used in a semiconductor production room, etc. CONSTITUTION:The objective composition contains (A) 10-40wt.% of a nonionic surfactant of formula I, II or III (R1 is 8-10C alkyl or alkenyl; R2 and R3 are H, 1-15C alkyl or alkenyl: sum of the carbon numbers of R2 and R3 is 8-22; (n) is integer of 5-30; (m) is integer of 3-20) and (B) 5-30wt.% of ethanolamine and essentially free from a compound containing a salt of an alkali metal such as Na or K and a nonsoap anionic surfactant.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid detergent composition suitable for cleaning dust-free clothing worn when working in a clean room such as a semiconductor manufacturing factory.

A lot of attention has been paid to maintaining the dust-repellent properties of Joshu Ritatsugon Mujingi. For this reason, polyester, nylon, etc. are used as materials for dust-free clothing, and improvements are made to improve conductivity, air permeability, and moisture permeability.

When cleaning such dust-free clothing, it is important not only to remove dirt, but also to avoid containing alkali metal salts, since if alkali metals remain on the cleaned dust-free clothing, it will have a negative effect on products in semiconductor manufacturing. The use of detergent is required. In addition, when using a detergent whose main ingredient is an anionic surfactant, especially a non-soap anionic surfactant such as a linear alkylbenzene sulfonate, the anionic surfactant will be adsorbed to the dust-free garment. This is undesirable because the conductivity and moisture permeability of the clothing are impaired. As described above, when cleaning dust-free clothing, there are restrictions on the use of detergents, and ion-exchanged water is often used as the water used. Therefore, in cleaning dust-free clothing, a nonionic surfactant is used inside the shell.

JP-A No. 46-4028 discloses that stain regeneration on polyester fibers/cotton is achieved by combining three types of nonionic surfactants with high, medium, and low average added moles of ethylene oxide into a detergent composition. It is stated that it prevents adhesion.

However, the combination of nonionic surfactants alone does not provide satisfactory cleaning power, and since a large amount of alkali builder is used, it cannot be used as a detergent for dust-free clothing.

JP-A-48-86907 discloses a concentrated heavy-duty liquid detergent containing a nonionic surfactant, an anionic surfactant consisting of a mixture of an alkylbenzene sulfonate and soap, and ethanolamine.

However, containing an anionic surfactant
As mentioned above, it is not preferable for cleaning dust-free clothes, and in terms of cleaning performance, it is not very preferable to use highly foaming anionic surfactants in washing machines in the industry.

SUMMARY OF THE INVENTION The present invention provides a liquid detergent composition that has excellent detergency suitable for cleaning dust-free clothes and does not have any adverse effect on the properties of dust-free clothes.

The liquid detergent composition of the present invention includes the following (,) and (b):
component, and is characterized by being substantially free of alkali metal salts and non-soap anionic surfactants.

(a) The following general formula (I), (II) or (III
) Nonionic surfactant: 10 to 40% by weight.

2 \ CH○1CH2CH, O+. H / ... (] II 3 "<3 (Symbols in the formula indicate the following (b) R1: Alkyl group or alkenyl group having 8 to 10 carbon atoms R2, R3: Hydrogen or C 1 to ■ 5 alkyl group or alkenyl group, provided that the total carbon number of R2 and R2 is 8 to 22; n: a positive number from 5 to 30 m: a positive number from 3 to 20) Ethanolamine: 5 to 30% by weight.

The present invention will be explained in more detail below.

The nonionic surfactant (a) used in the present invention is a condensate of an aliphatic alcohol or an alkyl (alkenyl) phenol and an alkylene oxide. Specifically, it is as follows.

The nonionic surfactant of general formula (I) is a condensation product of an alkyl (alkenyl)phenol having 8 to 10 linear or branched alkyl or alkenyl groups and ethylene oxide, in which ethylene oxide is per mole of phenol. 5 to 30 moles are added. The alkyl substituents in general formula (I) are derived from, for example, polymerized propylene, diisobutylene, octyne, nonene, and the like. A typical example is 6 to 2 per mole of nonylphenol.
Examples include polyoxyethylene nonylphenyl ether to which 0 mole ethylene oxide is added.

The nonionic surfactant of general formula (II) is a condensation product of a saturated or unsaturated aliphatic alcohol and ethylene oxide. The carbon chain of the aliphatic alcohol is straight or branched and preferably has from 8 to 22 carbon atoms.

Typical specific examples include a condensate of 14 moles of ethylene oxide per mole of aliphatic primary alcohol having 11 to 15 carbon atoms, or 12 to 1 mole of secondary alcohol
Examples include condensates of No. 15 to which ethylene oxide has been added.

The nonionic surfactant of general formula (III) is a polyoxyethylene polyoxypropylene alkyl (alkenyl) ether obtained by random or block condensation of ethylene oxide and propylene oxide with a saturated or unsaturated aliphatic alcohol. The carbon chain of the aliphatic alcohol is straight or branched and preferably has 8 to 22 carbon atoms. A condensation of 5 to 30 moles of ethylene oxide and about 3 to 20 moles of propylene oxide per mole of primary or secondary alcohol is preferred. In addition,
The order of condensation of ethylene oxide and propylene oxide is not particularly limited, and general formula (III) does not specify the order of condensation.

These nonionic surfactants as component (a) may be used alone or as a mixture, and are blended in the detergent composition in an amount of 10 to 40% by weight, preferably 20 to 30% by weight. If the content of the nonionic surfactant is less than 10% by weight, sufficient detergency cannot be obtained, while if it exceeds 40% by weight, the viscosity of the liquid detergent composition increases, which is not preferable.

As the ethanolamine component (b), monoethanolamine, jetanolamine, triethanolamine, or a mixture thereof is used, and jetanolamine is particularly preferred.

A mixture of these three ethanolamines is made by the reaction of ethylene oxide and ammonia, from which the pure compound can be separated by standard distillation methods.

In the liquid detergent composition of the present invention, the component (b) ethanolamine is 5 to 30% by weight, preferably 15 to 20% by weight.
Contains. If this amount is less than 5% by weight, satisfactory detergency cannot be obtained, while if it exceeds 30% by weight, problems such as ammonia odor will occur during storage, which is not preferable.

A portion of this ethanolamine may also be used to neutralize other acidic components added to the detergent composition.

In addition to the above-mentioned essential components, the following components can be added to the detergent composition of the present invention as needed.

i) Solvents such as glycols and alcohols jj) Builders such as citric acid and ethylenediaminetetraacetic acid (present as ethanolamine salts in detergent compositions) iii) Hydro-rope agents jv) Higher fatty acids and other foam control agents V) water;
Other additives such as enzymes, pigments, fragrances, etc. However, the detergent composition of the present invention does not substantially contain compounds containing alkali metal salts such as sodium helium and potassium, and non-soap anionic surfactants. This prevents alkali metals from remaining on the dust-free cloth after cleaning and adversely affecting semiconductor products. In addition, the non-soap anionic surfactant prevents the conductivity and moisture permeability of the dust-free garment from being impaired. In the present invention, higher fatty acids (present as ethanolamine salts in the composition) can be used as described above, but the effect of the fatty acids themselves is small, and they are used as a foam control agent and not as a main cleaning component. Therefore, since the amount added is small, the adverse effect on dustproof clothing can be ignored.

Preferably, the amount of higher fatty acid salt added to the detergent composition is 1
Less than % by weight.

According to the present invention, (a) a specific nonionic surfactant and (
b) By combining with ethanolamine, excellent detergency suitable for dustproof clothing can be achieved without using alkali metal salts generally used as builders or anionic surfactants used as main cleaning ingredients. Also,
There is no residual alkali metal salt on the items to be washed, making it suitable as a cleaning agent for dust-proof clothing used in semiconductor manufacturing and the like. Furthermore, since it has low foaming properties, it is suitable for washing machines used in the laundry industry and is useful as a laundry detergent.

As an example, a liquid detergent having the composition shown in Table 1 below was prepared and its cleaning power was evaluated, and the results are shown in the table.

The method for evaluating detergency is shown after Table 1.

(Leaving space below) 迭漘 1 person I4 Dense (i) Preparation of artificial stain After drying clay whose main ingredients are crystalline minerals such as kaolinite and vermiculite for 30 hours at 200'C, the average particle size is reduced to 1 μm. The pulverized product was used as an inorganic stain.

After dissolving 3.5 g of gelatin in 950 cc of water at approximately 40°C, it
0.25 g of carbon black was dispersed in water using an inverter (manufactured by INEMATICA). Next, 1.4.9g of inorganic dirt was added and emulsified with Polytron, and then 31.35g of organic dirt was added.
was added and emulsified and dispersed using a polytron to create a stable dirt bath. A Loam X 20 cm specified clean cloth (cotton cloth No. 60 designated by Japan Oil Chemists' Association) was immersed in this dirt bath, and the water was squeezed out using two rubber rolls to equalize the amount of dirt attached. After drying this dirty cloth at 105℃ for 30 minutes,
Both sides of the dirty cloth were rubbed 25 times on each side. This is 5
A stain model number was provided that was cut into cm x 5 cm and had a reflectance in the range of 42±2%. The soil composition of the artificially soiled cloth thus obtained is shown in Table 2.

(ii) 601I+g of organic dirt shown in Table 2 was adhered to a prepared Sebum cloth (cotton knitted 5cm x 5cm) per sheet.

(iii) Clean knitted cloth Cotton stockinette (the same material used for sebum cloth).

(jv) Cleaning method The cleaning device is Terg- by U, S, Testing.
Using an OTometer, put 10 pieces of artificial dirt and 3 pieces of Sebam cloth, then add a clean stockinette cloth, adjust the bath ratio to 30 times, and heat at 120 R, P, M for 10 minutes.
Wash at 0°C. The cleaning solution used was 900mQ with a detergent concentration of 0.167%, and the rinsing was done with 900mQ of water.
Do this for minutes. The water used was ion-exchanged water.

(V) Detergency Evaluation Method R is the reflectance (%) measured by a Cari Zeiss EL RE P HO reflectance meter.

The detergency was evaluated using the average value of 10 artificially soiled cloth samples.

Example 2 Sample N[l2 was used as an example, and as a comparative example, a granular detergent (sample Nn13) shown in Table 3 below containing an anionic surfactant and an alkali metal salt was used. The item was worn for a week at an actual electronics factory.
Washing was carried out using a 0 kg laundry washer using ionized water.

When the dust-free garments treated with each detergent were inspected again at the electronics factory, as shown in Table 4, all of the garments treated in the example passed the test, while those treated in the comparative example failed. Met.

Table-3: Nn13 (proportional) Sodium dodecylbenzenesulfonate 20w
t% sodium lauryl alcohol ethoxy sulfate 1
0wt% sodium silicate
15νt% sodium carbonate
10wt% Glauber's Salt (blank below) 16 Table 4: Inspection results ○: Pass ×: Fail

Claims (1)

[Claims] 1. (a) Nonionic surfactant represented by the following general formula (I), (II) or (III): 10 to 40% by weight ▲ Numerical formulas, chemical formulas, tables, etc. are included ▼...・(I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(II) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(III) (The symbols in the formula indicate the following: R_1: Carbon Alkyl group or alkenyl group with numbers 8 to 10 R_2, R_3: Hydrogen or an alkyl group or alkenyl group with 1 to 15 carbon atoms, provided that the total number of carbon atoms of R_2 and R_3 is 8 to 22 n: 5 to 30 positive number m: a positive number from 3 to 20) (b) A compound containing ethanolamine: 5 to 30% by weight and containing an alkali metal salt such as sodium or potassium in the composition, and a non-soap anionic surfactant. A liquid detergent composition characterized in that it is substantially free of.