JP2019219321A - Method of evaluating textile product, method of evaluating textile treatment agent using the same, and method of manufacturing textile treatment agent - Google Patents

Abstract

To provide an evaluation method which allows for quantitatively evaluating dryness of textile products in terms of a physical quantity.SOLUTION: A textile product evaluation method provided herein involves measuring a maximum heat absorption rate of a textile product, and using the maximum heat absorption rate as an indicator to evaluate dryness of the textile product.SELECTED DRAWING: None

Description

  The present invention relates to a method for evaluating a textile product, a method for evaluating a textile product treating agent using the same, and a method for producing a textile product treating agent.

  In the past, `` outside drying '', in which laundry was dried and dried outside the room, was common, but in recent years, along with changes in lifestyles of consumers, we want to dry outside, but due to environmental and time constraints, The number of people who cannot dry outside is increasing.

When the object to be washed is dried in the room, there is a problem that a soft and voluminous tactile feeling and a crisp and dry tactile feeling, such as those obtained by drying outside, cannot be obtained.
To solve such a problem, Patent Document 1 proposes a detergent containing a cationic polymer, a nonionic surfactant, and an anionic surfactant in order to impart a soft feeling and a dry touch.

JP-A-2006-113606

The present inventors have found from the results of various investigations that among the merits obtained by drying outside, there is a high demand for a dry feeling (a crisp and dry touch).
Therefore, we thought that if the dry feeling of textile products could be quantitatively expressed by physical quantities, the effect of imparting the dry feeling of the textile product treatment agent could be effectively appealed to consumers. There was only an evaluation method.
An object of the present invention is to provide a method for evaluating a fiber product that can quantitatively evaluate the dry feeling of the fiber product by a physical quantity, a method for evaluating a treating agent for a fiber product using the same, and a method for producing a treating agent for a fiber product. .

The present invention has the following aspects.
[1] A method for evaluating a textile product, comprising measuring a maximum heat absorption rate of the textile product and evaluating the dryness of the textile product using the maximum heat absorption rate as an index.
[2] Step A of measuring the maximum heat absorption rate of the textile product;
The fiber product and the material are the same, for a plurality of samples having any dry feeling, a step B of obtaining a correlation between the sensory evaluation of the dry feeling and the maximum heat absorption rate,
A textile product evaluation method, wherein the dryness of the textile product is evaluated based on the measured value of the maximum heat absorption rate obtained in the step A and the correlation obtained in the step B.
[3] At the time of measuring the maximum heat absorption rate, the measurement atmosphere temperature represented by Ts and the initial temperature of the textile product are 15 to 25 ° C, the temperature of the measuring section represented by To is 28 to 42 ° C, and To The method for evaluating a fiber product according to [1] or [2], wherein a difference ([Delta] T) between the two represented by -Ts is 3 to 27 [deg.] C.
[4] The method for evaluating a textile product according to any one of [1] to [3], wherein the textile product is a textile product treated using a textile product treating agent.

[5] A method for evaluating a fiber product treating agent, comprising treating the fiber product with the treating agent for a fiber product, and evaluating the dry feeling of the treated fiber product by the evaluation method of the above [4].
[6] The method for evaluating a fiber product treating agent according to [5], wherein the textile treating agent includes at least one selected from the group consisting of the following (a1) to (a6).
(A1) Cationic polymer.
(A2) Hardened castor oil.
(A3) Hardened palm oil.
(A4) Natural starch.
(A5) Polyvinyl alcohol.
(A6) Carboxymethyl cellulose.
[7] The method for evaluating a fiber product treating agent according to the above [6], wherein the textile treating agent further comprises one or both of the following (b1) and (b2).
(B-1) An anionic surfactant having an SO ₃ group or an SO ₄ group.
(B-2) Polyoxyalkylene type nonionic surfactant.

  [8] A method for producing a textile product treating agent, comprising the step of determining the composition of the textile product treating agent by using the textile product treating agent evaluation method according to any one of [5] to [7].

According to the method for evaluating a textile product of the present invention, the dryness of the textile product can be quantitatively evaluated using the maximum heat absorption rate as an index.
ADVANTAGE OF THE INVENTION According to the evaluation method of the textile product treating agent of this invention, the dry feeling imparting effect of the textile product treating agent can be quantitatively evaluated based on the evaluation result of the textile product drying feeling.
According to the method for producing a treating agent for textile products of the present invention, the composition of the treating agent can be easily determined.

The evaluation method of the present invention measures the maximum heat absorption rate (hereinafter, also referred to as a qmax value) of a target textile product, and evaluates the dryness of the textile product using the qmax value as an index.
As shown in Examples below, there is a correlation between the qmax value and the sensory evaluation of the dry sensation based on the dry sensation (dry and moist) when the fiber product is touched by hand. In the sensory evaluation, the one having a dry touch with a strong touch tends to have a smaller qmax value.

[Maximum heat absorption rate (qmax value)]
The qmax value of a textile product is obtained by applying a measuring part at a temperature (To) higher than the initial temperature (Ts) of the textile product by about 10 to 20 ° C. to a textile product having the same temperature as the measurement atmosphere temperature (Ts) at a predetermined contact pressure. This is a value (unit: W / cm ² ) obtained by measuring the peak value of the heat flow moving from the measuring section to the fiber product immediately after the contact (at about 0.2 seconds).
The qmax value is proportional to the difference (ΔT = To−Ts) between the temperature (To) of the measuring unit and the initial temperature (Ts) of the textile.

  When measuring the qmax value of the textile product, the measurement atmosphere temperature, the initial temperature (Ts) of the textile product, the temperature of the measuring part (To), and the difference (ΔT) between the two are the difference between the sensory evaluation of dry feeling and the qmax value. It is preferable that Ts is 15 to 25 ° C., To is 28 to 42 ° C., and ΔT is 3 to 27 ° C., and Ts is 18 to 22 ° C., To is 30 to 40 ° C. More preferably, ΔT is from 8 to 22 ° C, more preferably, Ts is from 19 to 21 ° C, To is from 30 to 36 ° C, and ΔT is from 9 to 17 ° C.

The qmax value is known as an index of the cooling sensation of contact and can be measured by a commercially available precision rapid thermophysical property measuring device. For example, the qmax value can be measured under the following condition settings (hereinafter, referred to as standard conditions) using a precision rapid thermophysical property measuring device, Thermolab IIB (product name) manufactured by Kato Tech Co., Ltd.
Material of measuring part: pure copper plate having a mass of 9.79 g (heat capacity: 4.186 × 10 ³ JK ⁻¹ m ⁻² ° C.).
Area of measurement part: 9 cm ² .
Contact pressure: 10 gf / cm ² .

The textile product to be evaluated is not particularly limited. For example, clothing, cloth, bedding, and curtains may be used.
The material of the fiber is not particularly limited. For example, natural fibers such as cotton, silk, hemp, wool, and the like, and chemical fibers such as polyester, acrylic, nylon, rayon, and polyamide can be used.
The feeling of dryness of textiles can also vary depending on the material. In the present specification, “the material of the fiber product is the same” means that the material of the fiber, the thickness of the fiber, and the weave or knitting of the fiber are all the same.
As a textile product to be evaluated, for example, a cotton towel (hereinafter referred to as a cotton towel) is easy to feel a difference in dryness and humidity when touched, and a correlation between a sensory evaluation of dryness and a qmax value is more easily obtained. It is preferred in that respect.
For example, a cotton towel having a thickness of 4 to 6 mm in a dry state (hereinafter referred to as a standard cotton towel) has a qmax value of 50 × 10 ⁻³ W when measured under the conditions of Ts = 20 ° C. and To = 30 ° C. / Cm ² or less, a “dry and crisp feel as if dried outside” is obtained.

The textile product may be treated using a textile product treatment agent (hereinafter, also referred to as a treatment agent). Examples of the treating agent include a detergent, a softener, a bleach, and a deodorant.
The treatment agent preferably contains a component contributing to a dry feeling (dry feeling imparting component). Examples of the dry feeling imparting component include the following (a1) to (a6). These may be used alone or in combination of two or more.
(A1) Cationic polymer.
(A2) Hardened castor oil.
(A3) Hardened palm oil.
(A4) Natural starch.
(A5) Polyvinyl alcohol.
(A6) Carboxymethyl cellulose.

Specific examples of the component (a1) include the component (B) described in JP-A-2001-10935 and the component (A) described in JP-A-2006-113606. For example, dimethyldiallylammonium acrylamide copolymer and cationized cellulose are exemplified.
Specific examples of the component (a2) include the component (A ′)-1 described in JP-A-2006-29143.
Specific examples of the component (a3) include the component (A) -1 described in JP-A-2006-29143.

The treating agent may contain the aforementioned dry feeling imparting component and a surfactant. Known surfactants can be used as appropriate. The surfactant preferably contains one or both of the following (b1) and (b2) in that the effect of imparting a dry feeling is easily obtained.
(B1) An anionic surfactant having an SO ₃ group or an SO ₄ group.
(B2) a polyoxyalkylene type nonionic surfactant.
Specific examples of the component (b1) include the component (D) described in JP-A-2010-59275.
Specific examples of the component (b2) include a component represented by the formula (AI) described in JP-A-2009-108248.

The surfactant may include a surfactant (c) that is not included in any of (b1) and (b2).
The treating agent may contain other optional component (d).

The method of treating a textile using a treatment agent includes at least a step of bringing the textile into contact with a treatment liquid containing the treatment, and a step of subsequently drying the textile. The treatment liquid may be a solution or a dispersion containing the treatment agent and the solvent, and may be the treatment agent itself when the treatment agent is a liquid.
Normally, a standard usage method (application method to fiber products, usage concentration, usage amount, etc.) is set for the treatment agent. For example, a deodorant or the like is used as a treatment liquid without diluting the treatment agent, the treatment liquid is brought into contact with the fiber product by a method of spraying an appropriate amount to the fiber product, and then dried.
In addition, detergents, softeners, bleaching agents, etc., after contacting the textile with the treatment liquid by a method of immersing the textile in the treatment liquid diluted with water, after rinsing or dewatering as necessary ,dry.
When the treating agent is used in a standard manner, the dry feeling of the textile product mainly depends on the composition of the treating agent and the drying conditions.
Drying conditions that easily affect the feeling of dryness of the textile include the drying method, the temperature and humidity of the drying atmosphere, the strength of the wind, and the drying time.

After the drying treatment, the fiber product may be stored in an arbitrary atmosphere in a folded state or a stacked state. It is preferable to store the fiber product to be evaluated so as not to be crushed by the load.
When evaluating the effect of the composition of the treatment agent or the drying conditions on the feeling of dryness, the storage time from the end of the drying treatment to the measurement of the qmax value is preferably 360 hours or less, and more preferably 240 hours or less. Further, when comparing the composition of a plurality of treating agents or comparing a plurality of drying conditions, it is preferable that the temperature and humidity of the storage atmosphere are adjusted to certain conditions.

By including one or more dry feeling imparting components selected from the components (a1) to (a6) in the treatment agent, the qmax value of the fiber product treated with the treatment agent can be reduced even under the same drying conditions. Can be reduced.
For example, as shown in Examples described below, when a standard cotton towel is treated with a treatment agent containing at least one dry feeling imparting component selected from the above-mentioned components (a1) to (a6), it is close to a room-dry environment. Even when dried under the conditions (20 ° C., 65% RH), the qmax value becomes 50 × 10 ⁻³ W / cm ² or less (Ts = 20 ° C., To = 30 ° C.).
In particular, from the viewpoint that the qmax value tends to be smaller, the dry feeling imparting component preferably contains at least one of (a1) a cationic polymer and (a2) hydrogenated castor oil, and contains at least (a1) a cationic polymer. Is more preferable.

Further, even when treated with a treating agent having the same composition, the dry feeling of the fiber product changes depending on the drying conditions. In other words, drying under conditions close to the outside drying environment (35 ° C., 50% RH, air blowing at an average of 0.2 m / s) and under conditions near the room drying environment (20 ° C., 65% RH, no blowing). Comparing the qmax values of the dried fiber products, the qmax value of the fiber product dried in the room drying environment is larger.
When the treatment agent containing the dry feeling imparting component is used, the difference between the qmax value of the outside drying environment and the qmax value of the room drying environment becomes small. This means that even under the drying conditions under which it is difficult to obtain a crisp and dry touch, a crisp and dry tactile sensation (feel close to an outside drying environment) can be obtained by the above-mentioned dry sensation imparting component.
For example, by treating a standard cotton towel with a treating agent containing at least one dry feeling imparting component selected from the above-mentioned components (a1) to (a6), the following two of the following room drying conditions A and the following outside drying conditions B The ratio (A / B) of the qmax values of the standard cotton towels A and B, each of which has been dried as described above, can be 1.0 to 1.1.
Room drying condition A: Drying in an atmosphere of 20 ° C. and 65% RH for 24 hours.
Drying condition B: Drying for 24 hours while blowing at an average of 0.2 m / s in an atmosphere of 35 ° C. and 50% RH.
A / B = (qmax value of standard cotton towel A dried under room-drying condition A) / (qmax value of standard cotton towel B dried under outside-drying condition B).
Measurement conditions of qmax value: Measured at Ts = 20 ° C. and To = 30 ° C. after adjusting the humidity to 20 ° C. and 65% RH.
From the viewpoint that A / B tends to be closer to 1.0, it is preferable that the dry feeling imparting component contains at least one of (a1) a cationic polymer and (a2) hydrogenated castor oil, and at least (a1) a cationic polymer More preferably, it contains a polymer.

The present invention includes the following aspects.
[Evaluation method for textile products]
(1) A mode in which the qmax value of a textile is measured and the dryness of the textile is evaluated using the qmax as an index.
According to this aspect, the dry feeling of the fiber product can be quantitatively evaluated by the physical quantity.

(1-1) A mode in which the qmax value of a fiber product treated with a treatment agent is measured, and the dry feeling of the fiber product is evaluated using the qmax value as an index.
According to this aspect, it is possible to quantitatively evaluate the dry feeling of the fiber product treated with the treatment agent by a physical quantity.

(1-2) qmax values of a plurality of textile products treated with the treatment agent, which have the same material and different composition of the treatment agent, are measured under the same measurement conditions, and An aspect in which the dry feeling of the fiber product is evaluated using the qmax value as an index.
According to this aspect, the difference in the effect of imparting a dry feeling due to the difference in the composition of the treatment agent can be relatively evaluated using the qmax value as an index.
(1-3) qmax values of a plurality of textile products treated with the treatment agent, which have the same material and different treatment conditions, are measured under the same measurement conditions, respectively, and the qmax value is measured. An aspect in which the dry feeling of the fiber product is evaluated using as an index.
According to this aspect, it is possible to relatively evaluate a difference in the effect of imparting a dry feeling due to a difference in processing conditions, using the qmax value as an index.

(2) Step A of measuring the qmax value of the fiber product, and obtaining a correlation between the sensory evaluation of the dry feeling and the qmax value for a plurality of samples having the same material as the fiber product and having an arbitrary dry feeling. A step of evaluating the dryness of the textile based on the measured value of the qmax value obtained in the step A and the correlation obtained in the step B.
In the present embodiment, the measurement conditions for the qmax value in step A and step B are the same.
The fiber product used in the step A and the sample used in the step B may have the same material. For example, a cotton towel of the same material, a cotton shirt of the same material, or the like can be used.
As the plurality of samples having an arbitrary dry feeling in the step B, for example, a plurality of samples different from each other in one or more of the composition of the treatment agent and the treatment conditions can be used.
In the step B, as a method of obtaining the correlation, a method of obtaining a scatter diagram, a correlation table, or a regression equation representing a correlation between an evaluation point of the sensory evaluation and a measured value of the qmax value may be mentioned.
The correlation obtained in step B can be applied to a fiber product having the same material as the sample used in step B.
According to this aspect, the dry feeling of the fiber product used in the step A can be absolutely evaluated using the qmax value as an index.

(2-1) An embodiment in which the qmax value of the fiber product treated with the treating agent in step A is measured in the embodiment (2).
According to this aspect, the dry feeling of the fiber product treated with the treating agent can be absolutely evaluated using the qmax value as an index.

(2-2) In the aspect of the above (2) or (2-1), based on the correlation (scatter diagram, correlation table, or regression equation) obtained in the step B, “a dry and dry touch” The range of the measured value of the qmax value (acceptance range) corresponding to the range of the evaluation points of the sensory evaluation in which is obtained is obtained. If the measured value of the qmax value obtained in the step A is the acceptable range, the step A An aspect in which the measured fiber product is determined to have a “crisp and dry touch”.
According to this aspect, by measuring the qmax value of the fiber product, it can be determined whether or not the fiber product has a “crisp and dry touch”.
If the standard cotton towel has a qmax value of 50 × 10 ⁻³ W / cm ² or less when measured under the conditions of Ts = 20 ° C. and To = 30 ° C., it can be determined to have a “dry and tactile feel”. .

(2-3) In the embodiment of the above (2) or (2-1), the measured value of the qmax value obtained in the step A and the correlation (scatter plot, correlation table, or regression) obtained in the step B Equation), from which the evaluation point in the sensory evaluation of the fiber product measured in step A is predicted.
According to this aspect, the degree of dryness of the fiber product can be known by measuring the qmax value of the fiber product.

[Evaluation method for treating agent for textile products]
(3) An embodiment in which the textile is treated with the treatment agent to be evaluated, and the dryness of the treated textile is evaluated by the evaluation method (1-1) or (2-1).
According to this aspect, based on the evaluation result of the dry feeling of the fiber product, the dry feeling imparting effect of the treatment agent can be evaluated.

(3-1) A plurality of treatment agents having different compositions are evaluated, and fiber products of the same material are respectively treated using the plurality of treatment agents. An aspect in which evaluation is performed by the evaluation method 2).
According to this aspect, the dry feeling imparting effect of the plurality of processing agents to be evaluated can be relatively evaluated.

(3-2) An aspect in which the fiber product is treated with the treatment agent to be evaluated, and the dry feeling of the treated fiber product is evaluated by the evaluation method of (2-2).
According to this aspect, it is possible to determine whether or not the treatment agent to be evaluated has an effect of giving a “crisp and dry touch”.
If the qmax value of a standard cotton towel treated with the treatment agent to be evaluated under the conditions of Ts = 20 ° C. and To = 30 ° C. is 50 × 10 ⁻³ W / cm ² or less, the treatment to be evaluated. It can be determined that the agent has an effect of giving a “crisp and dry touch”.

(3-3) An aspect in which the fiber product is treated with the treatment agent to be evaluated, and the dry feeling of the treated fiber product is evaluated by the evaluation method of (2-3).
According to this aspect, the dryness imparting effect of the treatment agent to be evaluated can be absolutely evaluated.

[Production method for treating agent for textile products]
(4) A method for producing a treatment agent, the method comprising the step of determining the composition of the treatment agent by using any one of the evaluation methods of the above-mentioned (3) and (3-1) to (3-3).
For example, in the method for producing a treatment agent containing the dry feeling imparting component, a prototype treatment agent in which one or both of the type and the content of the dry feeling imparting component is changed is evaluated, and the above (3), (3- The evaluation method according to any one of the aspects 1) to (3-3) is performed, and the type and suitable content of the dry feeling imparting component having a good dry feeling imparting effect are selected. A treating agent is produced using the selected dry feeling imparting component in a suitable content.
According to this aspect, it is possible to easily know a change in the effect of imparting a dry feeling due to a change in the design of the composition of the treatment agent. Therefore, the composition of the treatment agent can be easily determined.

(5) The above-mentioned (a1) to (a6) such that the standard cotton towel treated with the treating agent for textile products and dried under the following drying condition A has a qmax value of 50 × 10 ⁻³ W / cm ² or less. A) a method for producing a treating agent for textile products, wherein the treating agent for textile products comprises one or more components imparting dry feeling selected from the group consisting of
(6) A method for producing a textile product treating agent comprising one or more dry feeling imparting components selected from the group consisting of the above (a1) to (a6), wherein the textile product treating agent is treated with the textile product treating agent. A textile treatment, wherein the type and content of the dry feeling imparting component are set such that the qmax value of the standard cotton towel dried under the following room drying condition A is 50 × 10 ⁻³ W / cm ² or less. Method of manufacturing the agent.
[conditions]
Room drying condition A: Drying in an atmosphere of 20 ° C. and 65% RH for 24 hours.
Measurement conditions for qmax value: Ts = 20 ° C., To = 30 ° C.

(7) The ratio (A / B) of the qmax values of the standard cotton towels A and B, which were treated with the treating agent for textile products and dried under the following room drying conditions A and the outside drying conditions B, respectively, was 1. Production of a textile product treating agent, wherein one or more dry feeling imparting components selected from the group consisting of the above (a1) to (a6) are contained in the textile product treating agent so as to be 0 to 1.1. Method.
(8) A method for producing a fiber product treating agent containing one or more dry feeling imparting components selected from the group consisting of the above (a1) to (a6), comprising treating with the fiber product treating agent: The dry feeling was adjusted such that the ratio (A / B) of the qmax values of the standard cotton towels A and B, which were dried under two conditions of room drying condition A and the following external drying condition B, was 1.0 to 1.1. A method for producing a treating agent for textile products, wherein the type and content of the imparting component are set.
[conditions]
Room drying condition A: Drying in an atmosphere of 20 ° C. and 65% RH for 24 hours.
Drying condition B: Drying for 24 hours while blowing at an average of 0.2 m / s in an atmosphere of 35 ° C. and 50% RH.
A / B = (qmax value of standard cotton towel A dried under room-drying condition A) / (qmax value of standard cotton towel B dried under outside-drying condition B).
Measurement conditions of qmax value: Measured at Ts = 20 ° C. and To = 30 ° C. after adjusting the humidity to 20 ° C. and 65% RH.

In any one of the above (5) to (8), it is preferable that the dry feeling imparting component contains at least one of (a1) a cationic polymer and (a2) hydrogenated castor oil.
In any one of the above (5) to (8), it is preferable that the dry feeling imparting component contains (a1) a cationic polymer.

[Textile treatment agent]
(9) A textile product treatment agent containing one or more dry feeling imparting components selected from the group consisting of (a1) to (a6), which is treated with the textile product treatment agent and dried in a room as described below. A textile treatment agent, wherein the standard cotton towel dried under the condition A has a qmax value of 50 × 10 ⁻³ W / cm ² or less.
[conditions]
Room drying condition A: Drying in an atmosphere of 20 ° C. and 65% RH for 24 hours.
Measurement conditions for qmax value: Ts = 20 ° C., To = 30 ° C.
(10) A textile product treating agent containing one or more dry feeling imparting components selected from the group consisting of (a1) to (a6), which is treated with the textile product treating agent and dried in the following room A textile product treating agent, wherein the ratio (A / B) of qmax values of standard cotton towels A and B dried under two conditions of condition A and the following external drying condition B is 1.0 to 1.1.
[conditions]
Room drying condition A: Drying in an atmosphere of 20 ° C. and 65% RH for 24 hours.
Drying condition B: Drying for 24 hours while blowing at an average of 0.2 m / s in an atmosphere of 35 ° C. and 50% RH.
A / B = (qmax value of standard cotton towel A dried under room-drying condition A) / (qmax value of standard cotton towel B dried under outside-drying condition B).
Measurement conditions of qmax value: Measured at Ts = 20 ° C. and To = 30 ° C. after adjusting the humidity to 20 ° C. and 65% RH.

In the above (9) or (10), the dry feeling imparting component preferably contains at least one of (a1) a cationic polymer and (a2) hydrogenated castor oil.
In the above (9) or (10), the dry feeling imparting component preferably contains (a1) a cationic polymer.

  Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the following description. In the following, “%” representing the content is “% by mass” unless otherwise specified. "% RH" represents relative humidity.

<Measurement method / Evaluation method>
[Water content of textile products]
It was measured by an electric resistance moisture meter (product name: HB-100, manufactured by Kett Science Laboratory Co., Ltd.). Specifically, a four-needle terminal was connected to the HB-100, and the terminal was applied to the fiber product to be measured, and the value of the water content (moisture ratio) was read. N. d. Means below the detection limit (4% or less).

[Sensory evaluation of dryness of textile products]
Ten expert panelists evaluated the feel of the textile product according to the following evaluation criteria. The average value of the evaluation points of 10 people was used as the evaluation result. When the average value was 3.0 points or more, it was determined that there was "a dry and dry touch as if dried".
5 points: Very dry.
4 points: Dry and dry.
3 points: It is slightly dry.
2 points: slightly moist.
1 point: Moist and moist.
0 point: very wet.

[Qmax value of textile products]
The qmax value was measured under the above standard conditions using a precision rapid thermophysical property measurement device (manufactured by Kato Tech Co., Ltd., Thermolab IIB type). The measurement atmosphere was 20 ° C. and 65% RH.
Specifically, the textile was placed on a sample table at 20 ° C., and the initial temperature (Ts) of the textile was adjusted to 20 ° C. A 90-g weight T-BOX provided with a pure copper plate (measuring unit, area: 9 cm ² ) was placed thereon, and the measuring unit was brought into contact with the textile at a contact pressure of 10 gf / cm ² . The temperature of the measuring part (To) was 30 ° C., and ΔT was 10 ° C.
Five test pieces were measured for one type of fiber product (N = 5), and the average value thereof was taken as the measured value of the qmax value.

<< Example >>
In the following Examples 1 to 15, cotton towels having an arbitrary dry feeling were prepared, and the correlation between the sensory evaluation of the dry feeling and the qmax value was examined (step B).
Tables 1 and 2 show the preparation conditions and measurement results of the cotton towel. Table 3 shows a correlation table (frequency distribution table) obtained from the results of Tables 1 and 2.

<Examples 1 to 6>
(Preprocessing)
Pretreatment was performed on a new cotton towel to prepare a pretreatment towel.
Into a two-tub washing machine (Mitsubishi Electric Co., product name: CW-C30A1-H), add 30 L of warm water (about 40 to 50 ° C.), and use a nonionic surfactant as a detergent (average of 15 mol per mol of lauryl alcohol). 25 g of a 20% aqueous solution of alcohol ethoxylate to which ethylene oxide is added) is put into a washing tub, and a new cotton face towel (manufactured by Toshinsha, product name: 220 momme border soft FT, fiber: 20th single yarn, Fifteen sheets (thickness of about 5 mm in a dry state) were washed for 15 minutes and dehydrated for 1 minute. After these washing and dehydrating operations are repeated twice, the same washing and dehydrating operations are repeated three times without adding detergent, and the detergent is sufficiently rinsed, and then dried on a clothesline and naturally dried indoors. Treated towels.

(Humidity control before evaluation)
The moisture content of the pretreated towel and a test piece (hereinafter, referred to as a test piece) obtained by cutting the pretreated towel to 20 cm × 20 cm was adjusted by the following method.
Six pre-treated towels and 30 test pieces (one set of 5 sheets) were prepared and stored in a thermostat at 105 ° C. for 3 hours and dried completely. Another constant temperature chamber (manufactured by Yamato Scientific Co., Ltd.) was set to the humidity control conditions shown in the table, and under each condition, one absolutely dried pretreated towel and five absolutely dried test pieces were held for 24 hours. The sample was humidified to prepare a towel for evaluation and a test piece for evaluation. After the humidity control, it was placed in a sealable plastic bag and stored under the above humidity conditions until immediately before the evaluation test was performed.

(Evaluation test)
The towel for evaluation was taken out of the plastic bag and folded in four, and the sensory evaluation of dryness and the measurement of water content (at the time of evaluation) were performed. Further, the test piece for evaluation was taken out of the plastic bag, and the qmax value was measured.
The results are shown in the table. The unit of the qmax value shown in the table is “× 10 ⁻³ W / cm ² ”. The same applies hereinafter.

<Examples 7 to 9>
A pretreated towel and a test piece were prepared in the same manner as in Example 1.
(Treatment with treatment agent and humidity control before evaluation)
The pre-treated towel and the test piece are treated with an aqueous solution of a polyoxyalkylene-type nonionic surfactant (AE aqueous solution), then dried by three methods, and conditioned at 20 ° C. and 65% RH for evaluation. A towel and a test piece for evaluation were used.
Specifically, in a washing tub of a fully automatic electric washing machine (manufactured by Haier Co., product name: JW-Z23A), 15 L of used water described in JIS K3362: 1998 was put, and three pre-treated towels and 15 test pieces ( 5 sheets per set). In order to adjust the bath ratio (washing water / total weight of the cloth to be washed) to 20 times, a cotton skin shirt (manufactured by BVD, total weight of all the cloths to be washed: about 750 g) was charged.
12.5 g of a 20% aqueous solution of the same nonionic surfactant as used in the above (pretreatment) is put into a washing tub, and washing is performed in a standard course (washing 10 minutes, rinsing twice, dehydrating 5 minutes). Was. After dehydration, it was hung in a constant temperature room (manufactured by Yamato Scientific Co., Ltd.), dried and dried for 24 hours under the drying conditions shown in the table. After the drying was completed, moisture was conditioned at 20 ° C. and 65% RH for 24 hours to obtain an evaluation towel and an evaluation test piece.
In Example 7, air was blown with a fan during drying (average 0.2 m / s), and in Examples 8 and 9, no air was blown.

(Evaluation test)
The towel for evaluation was folded in four, and the sensory evaluation of the dry feeling and the measurement of the water content (at the time of evaluation) were performed. Also, the qmax value of the test piece for evaluation was measured.

<Examples 10 to 12>
A pretreated towel and a test piece were prepared in the same manner as in Example 1.
(Treatment with treatment agent and humidity control before evaluation)
The pre-treated towels and test pieces were treated with the following treatment solutions (A) to (C), respectively, and then dried and conditioned at 20 ° C. and 65% RH to obtain evaluation towels and test pieces.
[Treatment liquid (A)]
(A1-1) Dimethyl diallylammonium / acrylamide copolymer (manufactured by Lubrizol, trade name “Noverite 300”) 1.2 ppm,
(B1-1) Linear alkylbenzene sulfonic acid (manufactured by Lion Corporation, trade name “Laipon LH-200”, average molecular weight 322) 50 ppm,
(B2-1) An aqueous solution in which 40 ppm of C12-14 polyoxyethylene alkyl ether EO15 adduct and 15 ppm of (d-1) sodium coconut fatty acid (trade name “coconut fatty acid” manufactured by NOF CORPORATION) are dissolved in water. .
[Treatment liquid (B)]
(A1-2) 1 ppm of cationized cellulose (manufactured by Lion Specialty Chemicals, trade name “Leoguard LP”),
(B1-1) 40 ppm of linear alkylbenzene sulfonic acid (manufactured by Lion Corporation, trade name “Laipon LH-200”, average molecular weight 322), and (a2-1) hydrogenated castor oil (trade name “Caster made by NOF CORPORATION”) Wax A flake ") An aqueous solution in which 0.5 ppm is dissolved in water.
[Treatment liquid (C)]
(C-2) An aqueous solution in which 30 ppm of a TES cationic surfactant (the compound described in Example 4 of JP-A-2003-12471) is dissolved in water.

  Specifically, in a washing tub of a fully automatic electric washing machine (manufactured by Haier Co., product name: JW-Z23A), 15 L of used water described in JIS K3362: 1998 was put, and three pretreated towels and 15 test pieces ( 5 sheets). In order to adjust the bath ratio (washing water / total weight of the cloth to be washed) to 20 times, a cotton skin shirt (manufactured by BVD, total weight of all the cloths to be washed: about 750 g) was charged. Each of the treatment liquids (A), (B) and (C) was prepared in a washing tub, and was washed on a standard course (washing 10 minutes, rinsing twice, dehydrating 5 minutes). After dehydration, it was hung in a constant temperature room (manufactured by Yamato Scientific Co., Ltd.), dried, and dried at 20 ° C. and 65% RH for 24 hours to obtain an evaluation towel and an evaluation test piece. After humidity control, it was stored in a sealable plastic bag.

(Evaluation test)
The towel for evaluation was folded in four, and the sensory evaluation of the dry feeling and the measurement of the water content (at the time of evaluation) were performed. Also, the qmax value of the test piece for evaluation was measured.

<Examples 13 to 15>
Examples 10 to 12 were carried out in the same manner except that the drying conditions were changed as follows.
That is, after dehydration, it was hung and dried in a constant temperature room adjusted to 35 ° C. and 50% RH, and dried for 24 hours while blowing at an average of 0.2 m / s. After the drying was completed, moisture was conditioned at 20 ° C. and 65% RH for 24 hours to obtain an evaluation towel and an evaluation test piece. After humidity control, it was stored in a sealable plastic bag.
The towel for evaluation was folded in four, and the sensory evaluation of the dry feeling and the measurement of the water content (at the time of evaluation) were performed. Also, the qmax value of the test piece for evaluation was measured.

  Example 10 and Example 13, Example 11 and Example 14, and Example 12 and Example 15 are examples in which the same cotton towel was treated with the same treating agent and dried under two conditions of room drying condition A and outside drying condition B. . The ratio (A) of the qmax value of the cotton towel A (Examples 10, 11, 12) dried under the room drying condition A to the qmax value of the cotton towel B (Examples 13, 14, 15) dried under the outside drying condition B / B, and “Table describes“ ratio of qmax value of room drying / drying outside ”in the table).

From the results of Tables 1 to 3, the qmax value and the sensory evaluation of the dry feeling are correlated, and the smaller the qmax value, the better the dry feeling.
In the present example, the range of the evaluation points of the sensory evaluation for obtaining “crisp and dry touch” is 3 or more, and according to Table 3, the corresponding range of qmax value (acceptable range) is 50 or less. is there. Therefore, the qmax value of a cotton towel whose dryness is unknown is measured (Step A), and if the value of the qmax value is 50 × 10 ⁻³ W / cm ² or less, “a dry and dry feel as if dried outside” is obtained. It can be determined that it is obtained.

In Table 2, Examples 10 to 12 and Examples 13 to 15 differ from each other only in the composition of the treatment liquid. Based on the measured values of these qmax values, it can be seen that the treatment liquid (A) has the highest dryness-imparting effect of the three treatment liquids and the lowest treatment liquid (C).
Based on the correlation table of Table 3 and the measured values of the qmax values of Examples 10 to 12 and Examples 13 to 15, when treated with the treatment liquid (A) or the treatment liquid (B), a “dry and crisp feel as if dried out” Is obtained.
Further, it can be seen that when the treatment is performed with the treatment liquid (A) or the treatment liquid (B), the difference between the qmax values of the outside drying environment and the room drying environment becomes sufficiently small.

Claims (8)

  A method for evaluating a textile product, comprising: measuring a maximum heat absorption rate of the textile product; and evaluating a dry feeling of the textile product using the maximum heat absorption rate as an index. Step A of measuring the maximum heat absorption rate of the textile product;
The fiber product and the material are the same, for a plurality of samples having any dry feeling, a step B of obtaining a correlation between the sensory evaluation of the dry feeling and the maximum heat absorption rate,
A textile product evaluation method, wherein the dryness of the textile product is evaluated based on the measured value of the maximum heat absorption rate obtained in the step A and the correlation obtained in the step B.   When measuring the maximum heat absorption rate, the measurement atmosphere temperature represented by Ts and the initial temperature of the textile product are 15 to 25 ° C, the temperature of the measurement unit represented by To is 28 to 42 ° C, and To-Ts. The method for evaluating a fiber product according to claim 1, wherein the difference (ΔT) between the two is 3 to 27 ° C. 4.   The textile product evaluation method according to any one of claims 1 to 3, wherein the textile product is a textile product treated with a textile product treating agent.   A method for evaluating a fiber product treating agent, comprising treating a fiber product with the treating agent for a fiber product, and evaluating a dry feeling of the treated fiber product by the evaluation method according to claim 4. The method for evaluating a fiber product treating agent according to claim 5, wherein the textile treating agent comprises one or more selected from the group consisting of the following (a1) to (a6).
(A1) Cationic polymer.
(A2) Hardened castor oil.
(A3) Hardened palm oil.
(A4) Natural starch.
(A5) Polyvinyl alcohol.
(A6) Carboxymethyl cellulose. The method for evaluating a textile product treating agent according to claim 6, wherein the textile product treating agent further comprises one or both of the following (b1) and (b2).
(B-1) An anionic surfactant having an SO ₃ group or an SO ₄ group.
(B-2) Polyoxyalkylene type nonionic surfactant.   A method for producing a textile product treating agent, comprising the step of determining the composition of the textile product treating agent using the textile product treating agent evaluation method according to any one of claims 5 to 7.