JP2706989B2 - Liquid detergent composition for dust-free clothing - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid detergent composition suitable for cleaning a dust-free garment worn when working in a clean room such as a semiconductor manufacturing factory.

2. Description of the Related Art Much attention has been paid to dustless garments to maintain dust control. For this reason, polyester, nylon, etc. are used as the material of the dust-free garment,
A device has been devised for moisture permeability.

When cleaning such a dust-free garment, it does not contain an alkali metal salt because, of course, the alkali metal remaining in the cleaned dust-free garment adversely affects products in semiconductor manufacturing, as well as dirt removal. It is required to use a detergent. In addition, when a detergent containing an anionic surfactant, particularly a non-soap-based anionic surfactant such as a linear alkylbenzene sulfonate as a main component, is used, the anionic surfactant is adsorbed to a dust-free garment, so that dust-free clothing is used. The conductivity and moisture permeability of the clothes are impaired, which is not preferable. As described above, in the cleaning treatment of the dust-free garment, there are restrictions on the use of the detergent, and ion-exchanged water is often used as the used water. Therefore, in cleaning the dust-free garment, a nonionic surfactant is generally used.

Japanese Patent Application Laid-Open No. 46-4028 discloses that a detergent composition is prepared by combining three types of nonionic surfactants having a large, medium and small average number of moles of ethylene oxide, to thereby reduce the stain on polyester fibers / cotton. It is described that adhesion can be prevented.

However, a satisfactory detergency cannot be obtained only with a combination of nonionic surfactants, 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 nonionic surfactant,
A concentrated heavy duty liquid detergent comprising an anionic surfactant comprising a mixture of an alkylbenzene sulfonate and a soap and ethanolamine is disclosed.

However, the inclusion of an anionic surfactant is not preferable for cleaning dust-free clothes as described above, and in a washing machine in the art, a high-foaming anionic surfactant is used in terms of detergency. Its use is less preferred.

Problem to be Solved by the Invention The present invention has an excellent detergency suitable for cleaning dust-free clothes,
The present invention also provides a liquid detergent composition that does not adversely affect the characteristics of the dust-free garment.

The liquid detergent composition for a dust-free garment of the present invention contains the following components (a) and (b), and contains an alkali metal salt, a non-soap anionic surfactant and a zwitterionic surfactant. It is characterized in that it is not substantially contained.

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

(The symbols in the formulas represent the following: R ₁ : an alkyl group or alkenyl group having 8 to 10 carbon atoms R ₂ , R ₃ : hydrogen or an alkyl group or alkenyl group having 1 to 15 carbon atoms, provided that R ₂ and The total carbon number with R ₃ is 8 to 22 n: a positive number of 5 to 30 m: a positive number of 3 to 20 (b) Ethanolamine: 5 to 30% by weight.

 Hereinafter, the present invention will be described in more detail.

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

The nonionic surfactant of the general formula (I) is a condensation product of an alkyl (alkenyl) phenol having 8 to 10 linear or branched alkyl or alkenyl groups with ethylene oxide. 5 to 30 moles are added. The alkyl-substituted component in the general formula (I) is derived from, for example, polymerized propylene, diisobutylene, octin, nonene, and the like. A typical example is polyoxyethylene nonylphenyl ether to which 6 to 20 moles of ethylene oxide is added per mole of nonylphenol.

The nonionic surfactant of the 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 8 to 22 carbon atoms. Typical examples include a product obtained by condensing 14 moles of ethylene oxide with respect to 1 mole of an aliphatic primary alcohol having 11 to 15 carbon atoms, or a second polymer having a branched carbon chain having 10 to 12 carbon atoms. A condensate to which 12 to 15 ethylene oxides are added per 1 mol of the secondary alcohol is exemplified.

The nonionic surfactant of the 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. It is preferred that 5 to 30 moles of ethylene oxide and about 3 to 20 moles of propylene oxide are condensed per mole of the primary or secondary alcohol. 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 of the 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 of the component (b), monoethanolamine, diethanolamine, triethanolamine or a mixture thereof is used, and diethanolamine is particularly preferable. A mixture of these three ethanolamines is formed by the reaction of ethylene oxide and ammonia, from which the pure compound can be separated by standard distillation methods.

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

In addition, some of the ethanolamine may be used to neutralize other acidic components added to the detergent composition.

The following components can be added to the detergent composition of the present invention, if necessary, in addition to the above essential components.

i) Solvents such as glycols and alcohols ii) Builders such as citric acid and ethylenediaminetetraacetic acid (present as ethanolamine salts in detergent compositions) iii) Hydrotropes iv) Higher fatty acids and other foam control agents v) Water, other additives such as enzymes, dyes, and fragrances. However, the detergent composition of the present invention contains substantially no compound containing an alkali metal salt such as sodium or potassium and a non-soap anionic surfactant. This prevents the alkali metal from remaining in the dust-free garment after cleaning and adversely affecting the semiconductor product. In addition, the non-soap-based anionic surfactant prevents the conductivity and moisture permeability of the dust-free garment from being impaired. In the present invention, a higher fatty acid (existing as an ethanolamine salt in the composition) can be used as described above, but its influence is small, and it is used as a foam control agent and not as a main component for washing. Therefore, since the compounding amount is small, the adverse effect on the dust-proof clothing can be ignored. Preferably, the amount of the higher fatty acid salt in the detergent composition is less than 1% by weight.

Effect of the Invention According to the present invention, by combining (a) a specific nonionic surfactant and (b) ethanolamine,
Excellent detergency suitable for dustproof clothing can be realized without using an alkali metal salt generally used as a builder or an anionic surfactant used as a main cleaning component. In addition, the alkali metal salt does not remain on the object to be washed, and is suitable as a detergent for dustproof clothing used in semiconductor production and the like. Further, since it has low foaming properties, it is suitable for a washing machine used in the laundry industry and is useful as a laundry detergent.

Example 1 A liquid detergent having the composition shown in Table 1 below was prepared and the detergency was evaluated. The results are shown in the same table. In addition, the evaluation method of the detergency was shown after Table-1.

Detergency test method (i) Preparation of artificial soil Clay mainly composed of crystalline minerals such as kaolinite and vermiculite is dried at 200 ° C for 30 hours.
What was ground to an average particle size of 1 μm was used as inorganic soil.

After dissolving 3.5g of gelatin in 950cc of water at about 40 ° C,
Polytron, a powerful emulsifying and dispersing machine (KINEMATICA, Switzerland)
0.25 g of carbon black was dispersed in water. Next, 14.9 g of inorganic soil was added and emulsified with Polytron, and 31.35 g of organic soil was added and emulsified and dispersed with Polytron to form a stable soil bath. After a predetermined cleaning cloth (cotton cloth No. 60 designated by the Japan Oil Chemistry Association) of 10 cm × 20 cm was immersed in the dirt bath, water was squeezed with two rubber rolls to uniform the amount of dirt deposited. After drying the soiled cloth at 105 ° C. for 30 minutes, both sides of the soiled cloth were rubbed left and right 25 times each. This is 5cm x 5
C. and cut into pieces having a reflectance in the range of 42. +-. 2% and applied to a dirty cloth. The soil composition of the artificial soil cloth thus obtained is shown in Table-
2

(Ii) Preparation of sebum cloth A cloth (cotton knitted cloth 5 cm x 5 cm) to which 60 mg of organic dirt shown in Table 2 is adhered per sheet.

(Iii) Clean knitted cotton knitted knit (same as used for Sebam cloth).

(Iv) Cleaning method The cleaning device used is a Terg-O-Tometer from USTesting, into which 10 artificial soils and 3 sebum cloths are added, and further a clean knitted cloth is added, and the bath ratio is adjusted to 30 times. , 120r.
Wash at 50 ° C. for 10 minutes at pm. The cleaning solution has a detergent concentration of 0.167
Rinse with 900 ml of water for 3 minutes. Water used was ion-exchanged water.

(V) Detergency evaluation method R is the reflectance (%) measured by a Cari Zeiss ELREPHO reflectometer.

Note that the evaluation of the detergency was performed using the average value of 10 test artificial soils.

Example 2 Sample No. 2 in Table 1 was used as an example, and as a comparative example, the following table containing an anionic surfactant and an alkali metal salt was used.
Using the granular detergent No. 3 (Sample No. 13), the one worn for one week in an actual electronics factory was washed using a 50 kg laundry washer under the use of ion exchange water.

When the dust-free garments treated with the respective detergents were inspected again at the electronics factory, as shown in Table-4, those treated in the examples were all acceptable, whereas those treated in the comparative example were unacceptable. Met.

Table-3: Sample No.13 (Comparative example) Sodium dodecylbenzenesulfonate 20wt% sodium lauryl alcohol ethoxy sulfate 10wt% sodium silicate 15wt% sodium carbonate 10wt% Glauber salt residue

Claims (1)

(57) [Claims] 1. A nonionic surfactant represented by the following general formula (I), (II) or (III): 10 to 40% by weight (The symbols in the formulas represent the following: R ₁ : an alkyl group or alkenyl group having 8 to 10 carbon atoms R ₂ , R ₃ : hydrogen or an alkyl group or alkenyl group having 1 to 15 carbon atoms, provided that R ₂ and The total number of carbon atoms with R ₃ is 8 to 22 n: an integer of 5 to 30 m: an integer of 3 to 20) (b) Ethanolamine: containing 5 to 30% by weight, and sodium in the composition, A liquid detergent composition for dust-free clothing, which is substantially free of a compound containing an alkali metal salt such as potassium, a non-soap anionic surfactant and a zwitterionic surfactant.