JP2011002418A - Evaluation method of spinning performance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaluation method of the spinning performance of a material to be tested which can objectively evaluate the degree of the cob-webbing of the material to be tested by a dynamic parameter.SOLUTION: The evaluation method of the spinning performance is characterized so as to evaluate the spinning performance of the material to be tested from a first normal stress difference of the material to be tested and the shear stress or the viscosity of the material to be tested, preferably a value of the first normal stress divided by the shear stress or the viscosity. A shape of the material to be tested is preferably a non-solid shape. The material to be tested is preferably a composition containing a polymer having spinning performance.

Description

  The present invention relates to a method for evaluating spinnability. Specifically, products and products in various fields such as cosmetics, pharmaceuticals, foods, paints, and the like are used as test substances, and the degree of stringing of the test substances can be objectively evaluated by mechanical parameters. The present invention relates to a method for evaluating spinnability of a test substance.

  From the viewpoint of product quality evaluation, usability evaluation, functionality evaluation, workability evaluation, etc., research on spinnability has been made in the fields of cosmetics, pharmaceuticals, foods, paints and the like. For example, in the food field, it is used for evaluating the quality of yam (see Non-Patent Document 1) and potato starch (see Non-Patent Document 2).

  In the cosmetics field, the eyelash cosmetics are given a stringiness to give the eyelashes a volume feeling and a long lash effect (see, for example, Patent Document 1), or to the hairdressing cosmetics. By giving the properties, it has a smooth feel and has good elongation at the time of application (for example, see Patent Document 2). As described above, when the product is made spinnable, it is possible to impart usability and functionality peculiar to the product.

  In addition, when a spinnability is imparted to a product such as a cosmetic, the yarn is combed when the composition is picked up at the time of use, thereby providing the user with fun. However, although the method of evaluating the degree to which the yarn is wound is evaluated by a distance until the yarn is broken (for example, refer to Patent Document 3), it is necessary to evaluate with a constant yarn winding speed. In addition, there is no method for simply and objectively evaluating various test substances having different viscosities, and sensory evaluation has been the mainstream.

  On the other hand, when commercializing a material having spinnability, if the container is filled with the spinnable substance, the spinnable substance will sprinkle off the yarn from the filling nozzle even after filling, causing the container to become dirty or tube There is a problem that a sealing failure occurs.

  In order to solve such a problem, a method of cutting a yarn with a laser (see Patent Document 4), a method of winding around a rotating rod-like body (see Patent Document 5), and the like have been proposed. However, in order to adopt such a method, there is a problem that a special apparatus is required and a normal filling machine cannot be used.

  Therefore, if the spinnability can be easily evaluated by mechanical parameters, it is possible to set the filling conditions in which the spinnability hardly occurs when filling the spinnable substance into the container. There are also advantages that are possible.

JP 2007-314655 A JP 2002-241234 A JP 2007-327785 A JP 2004-58159 A JP 2008-24346 A

Sadako Arai and three others, “The characteristics of raw and freeze-dried yam yam”, Journal of Home Economics Society of Japan, 1998, Vol. 49, No. 10, p1079-1087 Kazuko Hirao and three others, “Flow characteristics of potato starch paste”, Journal of the Japan Society of Home Economics, 1985, Vol. 36, No. 1, p10-17

  The present invention has been made in view of the above prior art, and provides a method for evaluating the spinnability of a test substance, which can objectively evaluate the degree of stringing of the test substance using mechanical parameters. And

That is, the present invention
[1] A method for evaluating spinnability, wherein the spinnability of a test substance is evaluated from the first normal stress difference of the test substance and the shear stress or viscosity of the test substance Evaluation method of yarn property,
[2] The spinnability evaluation method according to [1], wherein the spinnability of the test substance is evaluated from a value obtained by dividing the first normal stress difference by the shear stress or the viscosity,
[3] The method for evaluating spinnability according to [1] or [2] above, wherein the test substance is in a non-solid form, and [4] the test substance has high spinnability. It is a composition containing a molecule | numerator, It is related with the evaluation method of the spinnability in any one of said [1]-[3] characterized by the above-mentioned.

  The evaluation method of the present invention can objectively evaluate the degree of stringing (degree of stringiness) of the test substance. Thereby, in the development of the spinnable product, it is possible to objectively evaluate the degree of spinnability. In addition, when filling a container with the spinnable composition, it is possible to set filling conditions in which stringing hardly occurs.

It is the figure which represented the evaluation result of the spinnability of each test substance with the seven-stage evaluation score by sensory evaluation. It is a figure showing the relationship between the sensory evaluation result of the spinnability of each test substance, and the first normal stress difference in the shear rate of 1000 s- ¹ . It is a figure showing the relationship between the sensory evaluation result of the spinnability of each test substance and the viscosity at a shear rate of 1000 s- ¹ . It is a figure showing the relationship between the sensory evaluation result of the spinnability of each test substance, and the value which remove | divided the 1st normal stress difference in shear rate 1000s- ¹ by the viscosity. It is a figure showing the relationship between the sensory evaluation result of the spinnability of each test substance, and the value which remove | divided the 1st normal stress difference in the shear rate of 500 s ^-1 by the viscosity.

  The evaluation method of the present invention uses products, products, etc. in various fields such as cosmetics, pharmaceuticals, foods and paints as test substances, and the degree of spinnability is objectively determined by the mechanical parameters of the test substances. It is characterized in that it can be evaluated.

  From the viewpoint of evaluating spinnability, the test substance to be used for evaluation is not particularly limited as long as its shape is not solid. For example, non-solid shapes such as liquid, emulsion, gel, paste, cream, wax and the like can be mentioned. Since objective evaluation is possible even in a creamy or waxy form, which has been difficult to evaluate in the past, it is preferable to use a creamy or waxy form for the test substance.

  The wax-like test substance in the present invention has a paste-like or cream-like appearance at room temperature (1 to 30 ° C.), filled in a wide-mouthed container, and tilted the container to 90 ° for 1 minute. In this case, the filled content does not show fluidity. An example of such a composition is a wax hair conditioner filled in a wide-mouth container found in hairdressing cosmetics.

  The evaluation method of the present invention can evaluate materials that hardly show spinnability to substances that show high spinnability. In the cosmetics field, pharmaceutical field, etc., a spinnable polymer is usually blended in order to impart high spinnability to the product. Therefore, a composition containing a spinnable polymer can be preferably used as a test substance.

  Examples of such a polymer include water-soluble synthetic polymer compounds, semi-synthetic polymer compounds, and natural polymer compounds. Specific examples include polyethylene glycol, highly polymerized polyethylene glycol, carboxyvinyl polymer, sodium polyacrylate, polyvinyl alcohol, polyvinyl methyl ether, polyvinyl pyrrolidone, polyacrylamide, polyethylene oxide, and ethylene oxide / propylene oxide block copolymers. Molecules; semi-synthetic polymers such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, methyl hydroxypropyl cellulose, carboxymethyl starch, methyl starch, propylene glycol alginate; gelatin, carrageenan, guar gum, quince seed, xanthan gum, Pullulan, collagen, gum arabic, man Emissions, starch, dextran, casein, albumin, can be exemplified natural polymers such as such as hyaluronic acid.

  Conventionally, as a method for evaluating the spinnability of products and products, the degree of evaluation has been evaluated exclusively by sensory evaluation by humans, particularly in the fields of cosmetics and pharmaceuticals. Therefore, as a result of intensive studies on a method that the present inventors can simply and objectively evaluate, the spinnability felt by humans when using the first normal stress difference of the test substance and the shear stress or viscosity of the test substance As a result, the present invention has been completed.

  That is, the spinnability of the test substance is evaluated from the first normal stress difference that is a stress acting in a direction perpendicular to the shear plane of the test substance and the shear stress that is a stress acting in a direction parallel to the shear plane. can do.

  Further, since the shear stress is obtained by multiplying the viscosity by the shear rate, that is, the shear stress divided by the shear rate is obtained as the viscosity, from the first normal stress difference of the test substance and the viscosity of the test substance, The spinnability of the test substance can also be evaluated.

As a result of the examination by the present inventors, the degree of spinnability of the test substance felt by humans did not correlate with each measured value of the first normal stress difference or shear stress or viscosity, but the first normal The value obtained by dividing the stress difference by the shear stress or the viscosity, that is, the following formula 1 or 2
[Degree of spinnability of test substance felt by human] = [first normal stress difference] / [shear stress] (1)
Or [degree of spinnability of the test substance felt by humans] = [first normal stress difference] / [viscosity] (2)
It was found that the value obtained by (1) and a high correlation were shown. It should be noted that the degree of spinnability of a test substance that humans feel indicates that the greater the numerical value obtained by the above formula, the greater the degree of spinnability.

  The values of the first normal stress difference, shear stress, and viscosity in the evaluation method of the present invention can be measured by using a commercially available rheometer. The rheometer used is not particularly limited as long as the above values can be measured, and may be either a stress control type or a strain control type.

  The measurement condition of the rheometer is not particularly limited as long as it is a normal measurement condition, but it is preferable to measure at a constant measurement temperature under a measurement temperature condition of 20 to 30 ° C. in a constant humidity and constant temperature measurement chamber.

The shear rate at the time of measurement is not particularly limited as long as each value of the first normal stress difference, the shear stress, and the viscosity can be obtained, but can be obtained by the above formula 1 or 2 [degree of spinnability of test substance felt by humans] and values], in view of the correlation with the degree of spinnability that is actually felt by the sensory evaluation of the human, it is preferable to measure in a range of 100～1000S ^-1, more preferably 300～1000S ^-1, 400 to 700 s ⁻¹ is more preferable, and measurement in the range of 500 to 600 s ⁻¹ is particularly preferable.

  Thus, since the value obtained by the formula 1 or 2 shows a high correlation with the degree of spinnability actually felt by the person of the test substance, the spinnability is developed in the development of a product having spinnability. Can be objectively evaluated. In addition, since the spinnability correlates with the stress and viscosity related to the substance, it is difficult to produce the spinnability by changing the filling temperature, the filling nozzle diameter, etc. in the production of the product having the spinnability. Can be predicted.

(Test substance)
According to the composition shown in Table 1, highly polymerized polyethylene glycol (trade name “POLYOX WSR-301”, manufactured by Dow Chemical Co., Ltd.), which is a spinnable substance, is blended at various concentrations, and hair styling agent 1 in the form of wax hair styling agent. ~ 5 were prepared. In addition, the compounding quantity in Table 1 represents "mass%".

In addition, the following commercially available wax hairdressing agents (all manufactured by Mandom Co., Ltd.) were used as hairdressing agents 6-10.
Hair conditioner 6: Product name "Gatsby Moving Rubber Spiky Edge"
Hair conditioner 7: Product name "Lucido L Designing Pot # Nuance More"
Hair conditioner 8: Product name "Gatsby Moving Rubber Nuance Motion"
Hairdressing agent 9: Product name "Lucido L Designing Pot #Eddie Move"
Hair conditioner 10: Trade name “Gatsby Moving Rubber Loose Shuffle”

(Test Example 1: Thread sensory evaluation test)
For the test substances 1 to 10, the degree of spinnability was sensory evaluated by 20 specialist panels. That is, for each of the test substances (hairstyling agents 1 to 10) filled in the wide-mouthed container, the surface of the test piece (hairstyling agents 1 to 10) is lightly pressed with the fingertips, and then the degree of stringing when squeezed upward at a constant speed is rated in 7 stages Sensory evaluation was performed by the method.

  In the evaluation, when the test substance was evaluated by preliminary sensory evaluation by 10 specialist panels, the hair styling agent 3 that was evaluated to show an approximately middle degree of spinnability in the test substance was set as a standard product, and the score 4 It was. Moreover, the hairdressing agent 10 evaluated as having the highest spinnability was assigned a score of 7, and the state without spinnability (purified water only) was assigned the rating of 1.

  According to the seven-stage evaluation criteria, the stringiness of the hair styling agents 1 to 10 was sensory evaluated, and the average value of the evaluation points of each panel was adopted as the evaluation score. The results are shown in Table 2 and FIG.

(Test Example 2: Measurement of mechanical parameters)
Using a cone plate (diameter 25 mm, cone angle 1 °) as a jig for a stress-controlled rheometer (Physica MCR300 type, manufactured by Anton Paar), the shear rate in steady flow measurement in which stress is applied in a fixed direction is 100 to 1000 s ⁻ The first normal stress difference and the viscosity of each test substance were measured under a measurement condition of 25 ° C. with a change in the range of ¹ . The measurement results of the first normal stress difference (unit: Pa) at each shear rate are shown in Tables 3 to 4, and the measurement results of viscosity (unit: Pa · s) are shown in Tables 5 to 6.

(Comparative Example 1)
The relationship between the test result of the test substance of Test Example 1 and the first normal stress difference at the shear rate of 1000 s ^-1 of Test Example 2 was graphed, and the correlation between the two was examined. The results are shown in FIG.

  From FIG. 2, the correlation coefficient (r) was 0.33 as a result of obtaining the correlation coefficient between the spinnability sensory evaluation score and the first normal stress difference by the least square method. Therefore, it can be seen that the spinnability of the substance does not correlate with the first normal stress difference, which is a stress acting in a direction perpendicular to the shear plane of the substance.

(Comparative Example 2)
The relationship between the test results of the test substance of Test Example 1 and the viscosity at a shear rate of 1000 s ^-1 of Test Example 2 was graphed, and the correlation between the two was examined. The results are shown in FIG.

  As a result of obtaining the correlation coefficient between the spinnability sensory evaluation score and the viscosity by the least square method from FIG. 3, the correlation coefficient (r) was 0.44. Thus, it can be seen that the spinnability of the material does not correlate with the viscosity associated with the stress acting in the direction parallel to the shear plane of the material.

Example 1
The value of the first normal stress difference obtained in Test Example 2 was divided by the viscosity value [[first normal stress difference] / [viscosity]]. The calculated values (unit: s ⁻¹ ) at each shear rate are shown in Tables 7-8.

Graph the relationship between the value of [[first normal stress difference] / [viscosity]] at the shear rate of 1000 s ⁻¹ calculated above and the sensory evaluation result of the spinnability of the test substance of Test Example 1, The correlation between the two was examined. The results are shown in FIG.

  From FIG. 4, the correlation coefficient between the spinnability sensory evaluation score and the value obtained by dividing the first normal stress difference by the viscosity was determined by the least square method. As a result, the correlation coefficient (r) was as high as 0.94.

(Example 2)
The ^value of [[first normal stress difference] / [viscosity]] at the shear rate of 500 s ⁻¹ calculated above is the same as in Example 1 and the results of sensory evaluation of the spinnability of the test substance of Test Example 1 The relationship between the two was graphed and the correlation between the two was examined. The results are shown in FIG.

  From FIG. 5, the correlation coefficient between the spinnability sensory evaluation score and the value obtained by dividing the first normal stress difference by the viscosity was determined by the least square method. As a result, the correlation coefficient (r) was as high as 0.95.

  From the results of Examples 1 and 2 and Comparative Examples 1 and 2, the spinnable strength of the substance does not correlate with the first normal stress difference or the viscosity itself, but the value obtained by dividing the first normal stress difference by the viscosity. It can be seen that there is a high correlation. In addition, since the shear stress is obtained by multiplying the viscosity by the shear rate, it can be seen that a high correlation can be obtained in the same manner even when the first normal stress difference is divided by the shear stress.

Claims (4)

  A method for evaluating spinnability, wherein the spinnability of a test substance is evaluated from the first normal stress difference of the test substance and the shear stress or viscosity of the test substance. Evaluation methods.   The spinnability evaluation method according to claim 1, wherein the spinnability of the test substance is evaluated from a value obtained by dividing the first normal stress difference by the shear stress or the viscosity.   The spinnability evaluation method according to claim 1, wherein the test substance has a non-solid shape.   The spinnability evaluation method according to claim 1, wherein the test substance is a composition containing a spinnable polymer.

Images