JPS58216949A - Hair bundle for measuring charge of hair - Google Patents

Abstract

PURPOSE:To measure dynamic charge characteristic of hair by applying a conductive adhesive or a conductive coat to one end of hair bundle to form a fastened hair bundle. CONSTITUTION:The hair 1 of an adult woman is aligned in the direction and the root end thereof is fastened on an aluminum plate 2 with an epoxy resin. Then, the fastened part 3 of the hair bundle and the aluminum plate 2 are coated with a silver-powder-filled conductive coat 4 to obtain a hair bundle. The conductive adhesive or conductive coat therein used is the one having a conductive filler of metal powder such as silver, copper and aluminum powder or a carbon powder, graphite or the like mixed with a binder such as epoxy, phenol, acryl, polyester, alkyd, urethane, silicone and rubber or a solvent dissolving the binder.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hair bundle suitable for easily measuring the dynamic charging characteristics of hair.

Hair products such as rinses and treatments have a close relationship with hair, and various methods have been tried to measure their electrostatic properties.

Since it is difficult to directly measure the electrostatic properties of human hair, hair strands are usually used to quantitatively measure the antistatic effect of various hair products. Examples of this method include measuring the surface potential of the hair bundle charged by brushing or applying a voltage, or measuring the amount of electricity in a Faraday cylinder. Are all of these statically charged properties of hair, which is an insulator? This is the method of measurement.

However, hair is in contact with the conductive scalp, and therefore, as for the charging characteristics of hair, it is necessary to evaluate both the ease of charging and the leakage of charge. It is difficult to evaluate leakage using conventional methods, and it cannot be said that this method is a true method for evaluating the charging characteristics of hair.

The present inventor believes that if the end portion of each hair in a hair bundle is brought into contact with a conductor and grounded, it will exhibit charging characteristics similar to those of actual hair, and as a result of extensive study, the present invention was developed. completed.

That is, the present invention provides a hair bundle for measuring the chargeability of hair, in which one end of the hair bundle is fixed using a conductive adhesive or a conductive paint.

The conductive adhesive or conductive paint used in the present invention is a metal powder such as silver powder, copper powder, or aluminum powder, or a conductive filler such as carbon powder or graphite, or epoxy, phenol, acrylic, polyester, alkyd, urethane, or silicone. Examples include a conductive adhesive or a conductive paint mixed with a binder such as , rubber, or a solvent that dissolves these materials. Methods for making hair bundles using these include methods such as directly fixing hair using the conductive adhesive mentioned above, metal plates, etc. Examples include a method in which the hair is fixed directly or to a support plate using an insulating adhesive, and then a conductive paint is applied to the surface.

In the hair bundle obtained by such a method, one end of each hair is in contact with an electrically conductive support, so that the hair bundle has charging properties similar to those of the hair in contact with the scalp.

After the hair bundle is charged by applying voltage or applying voltage, the amount of charge or the change in charge voltage over time is measured. This makes it possible to quantitatively measure the dynamic charging characteristics of hair. As a method for measuring the chargeability, any of the commonly used methods such as a surface electrometer and a Faraday cage can be applied.

Hereinafter, this will be explained in detail using examples.

Example 1 Adult female hair (l) (length approximately +5cn+, ly
), align the direction of the hair, and attach the end of the hair in the direction of the hair root to the epoxy tree IIm.
Aluminum plate (2) (thickness approx. 0.1 mm) using Y
After this is fixed, the fixed part of the hair bundle (3) and the aluminum plate (2)
Silver powder conductive paint (F-p) 550. 1
0'Ω/. ) I applied all the hair and got a bunch of hair. The perspective view of this is shown in Figure 1(a)+, and the side view is shown in Figure 1 (to) IV? -Showed. As a control, hair strands not coated with conductive paint were used.

(2. Chargeability was measured using a Faraday cage (5) and an electric quantity measuring device (6) in Figure 2 (Uninosaru electrometer manufactured by Yoro Denki Co., Ltd.).The hair was charged using a plastic comb. After holding the bundle (7) in a Faraday cage (5) and measuring the amount of charge, the hair bundle grounding electrode (9) connected to the top of the hair bundle holder is connected to an insulator and a Teflon retainer (8). ) Connected to the Faraday box outer cylinder through K1, and grounded through the fixed part of the aluminum plate, the attenuation of the charge due to leakage was measured.A personal computer (NECPC8001) was used to analyze the measurement results, and the initial The amount of charge and half-life were calculated at the same time as the measurement.

FIG. 3T shows an example of attenuation curve measurement (2sc, ao%) of a hair bundle treated with a commercially available hair conditioner, and Table 11 shows the measurement results of a hair bundle treated with one of various antistatic IL agents.

Table 1 Results of measuring the chargeability of hair bundles using the Faraday box method (2
5C120) As is clear from Figure 3 and Table 1, the reproducibility of the measured values was better in the hair bundles coated with the conductive paint than in the control, and the half-life 5- was significantly reduced by the antistatic agent. Therefore, the effect of the hair bundle of the present invention was confirmed.

Example 2 As shown in FIG. 4(a) of the hair bundle prepared by the method of Example 1, the amount of charge was measured using a metal support fil and an aluminum comb electrode (2). Personal computer 1 (NECPC800) was used to analyze the measurement results.
1), the average charging voltage was calculated at the same time as the measurement.

Table 2r - Shows the measurement results of hair bundles treated with various antistatic agents.

= 6 = Table 2 As is clear from Table 2, when the hair bundles of the present invention are used, the reconditioning is good, and at the same time, the antistatic treated hair bundles (I63 to
In case 6), the amount of charge was lower than that of the control, reflecting leakage similar to the chargeability in the human body, and it became clear that it was possible to measure charging characteristics closer to reality.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) show a perspective view and a side view of the hair bundle produced in Example 1, respectively. FIG. 2 is a schematic diagram of a hair bundle chargeability measuring device using a Faraday cage. Figure 3 shows the charge decay curve due to leakage.
shows the results when using the hair bundle according to the present invention, and shows the results when using the control hair bundle (not coated with conductive paint). Is Figure 4 a comb electrode? FIG. 2 is a schematic diagram of a device for measuring the chargeability of hair bundles. Patent Applicant Ajinomoto Co., Ltd. 1 (a,) (1) N Iroλ N ? 1 st 3 Suspension

Claims (1)

[Claims] A hair bundle for measuring the electrostatic property of hair, characterized in that one end of the hair bundle is fixed using a conductive adhesive or a conductive paint.