JPS61207965A - Method for evaluating detergency for oil stain - Google Patents

Abstract

PURPOSE:To evaluate the detergency for the oil stain of a cloth which cannot be evaluated by a light reflection method by impregnating hydrocarbon and fatty acid to the cloth in order to simulate the oil stain of the cloth, cleaning such cloth as a standard stained cloth, extracting the material remaining after the cleaning with an org. solvent and separating and measuring the quantity of the hydrocarbon and fatty acid remaining in the extraction liquid by a column chromatography. CONSTITUTION:The hydrocarbon and fatty acid as the simulating materials for mineral oil, animal and vegetable oils are dissolved in the org. solvent and the soln. is impregnated to the cloth. The cloth after the impregnation is taken out and is dried at a low temp. and is used as the cloth prior to washing. Such cloth is washed by using the detergent and is then take out. The cloth is dipped in the org. solvent under shaking to extract the hydrocarbon and fatty acid remaining in the cloth after the cleaning. The extraction liquid is separated to the hydrocarbon and fatty acid as well as the detergent by the column chromatography. The hydrocarbon and fatty acid are quantitatively determined by an IR spectrophotometer. The separating conditions of the column chromatography are changed according to the kind of the detergent. The evaluation of the detergency is given by the prescribed equation from the quantity of the hydrocarbon and fatty acid in the stained cloth which is not cleaned.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for evaluating the detergency of oil stains on cloth, which cannot be evaluated by the light reflection method.

(Prior Art) A conventional method for evaluating the detergency of clothes uses a light reflection method in which the surface of the clothes is irradiated with light and the detergency of the clothes is evaluated based on the original reflectance. This method is suitable for evaluating colored stains, such as ink stains and mud, but K is not suitable for evaluating the cleaning power of stains from substances such as sweat and oil that are difficult to measure using light reflection methods. .

(Problems to be Solved by the Invention) The present invention aims to provide a novel method for evaluating the detergency of oil stains on cloth, which cannot be evaluated by the light reflection method.

(Means for deciding the problem) The present invention is based on the fact that the main components of oil stains that adhere to clothing (especially work clothes) are mineral oil, animal and vegetable oils, and that CnH2n+1 (hydrocarbon) is used as a substitute for mineral oil and animal and vegetable oils. Class, CM
This method was developed based on the fact that H2In+1C00H (fatty acid) can be used and that they can be separated and measured by column chromatography.

That is, the present invention impregnates the cloth with hydrocarbons and fatty acids to simulate oil (mineral oil, animal and vegetable oil, etc.) stains on the cloth, washes the cloth as a reference contaminated cloth, and removes the remaining substances on the cloth with an organic solvent after cleaning. This method uses column chromatography to separate and measure the amounts of hydrocarbons, fatty acids, and detergent in the extract, and then evaluates the detergency of oil stains based on the measured values.

The procedure of the present invention is as follows.

First, hydrocarbons and fatty acids as simulants of mineral oil, animal and vegetable oils are dissolved in an organic solvent such as acta (carbon tetrachloride), and this is impregnated into the cloth.After the infiltration, the cloth is taken out, dried at low temperature, and washed. Use the previous cloth.

Next, the cloth is washed with a detergent and then taken out, immersed in an organic solvent and shaken to extract hydrocarbons and fatty acids remaining in the cloth after washing from the organic solvent side.

This extract is separated into hydrocarbons, fatty acids, and detergent by column chromatography, and the hydrocarbons and fatty acids are quantified using an infrared spectrophotometer. Separation conditions for column chromatography vary depending on the type of detergent.

The evaluation of detergency was based on hydrocarbons in unwashed contaminated cloth,
Depending on the amount of fatty acid (this amount is also determined in the same way as above), it is given by the following formula:

The present invention makes it possible to evaluate the detergency of heat-adhesive oil stains, which could not be evaluated by conventional light reflection methods, and has great industrial significance.

Sub-agent: 1) Akira Sub-agent Ryo Hagi Hara -

Claims (1)

[Claims] In order to simulate oil (mineral oil, animal and vegetable oil) stains on the fabric, hydrocarbons and fatty acids are impregnated into the fabric, the fabric is washed as a standard contaminated fabric, and the substances remaining on the fabric after washing are extracted with an organic solvent, A method in which the amounts of hydrocarbons, fatty acids, and detergents in the extract are separated and measured using column chromatography, and the detergency of oil stains is evaluated from the measured values.