WO2018061369A1

WO2018061369A1 - Batting

Info

Publication number: WO2018061369A1
Application number: PCT/JP2017/024130
Authority: WO
Inventors: 宏小野; 成明中村; 正雄家野
Original assignee: 東洋紡株式会社; 日本エクスラン工業株式会社
Priority date: 2016-09-29
Filing date: 2017-06-30
Publication date: 2018-04-05
Also published as: TW201817347A

Abstract

The purpose of the present invention is to provide a batting, suitable for bedding or clothing, that, with regard to moisture absorbance and heat generation, has a high rate of initial temperature rise, has a high level of loft, and allows a human body to quickly sense a comfortable, warm environment. Provided is a batting containing 40-90% by weight of a polyester fiber and 10-60% by weight of a cross-linked polyacrylate-based fiber of the sodium salt type and/or the potassium salt type, wherein the batting is characterized in that: the cross-linked polyacrylate-based fiber of the sodium salt type and/or the potassium salt type is a composite fiber comprising a surface layer section with a cross-linked structure and sodium salt and/or potassium salt carboxyl groups and a central section with a side-by-side structure comprising acrylonitrile-based polymers of two types with different acrylonitrile content ratios; and the area of a cross-sectional surface of the composite fiber accounted for by the surface layer section is at least 5% and less than 20%.

Description

Batting

The present invention relates to a batting suitable for bedding and clothing, which has a high level of moisture absorption exothermicity that brings about warm air with low humidity and bulkiness that brings about heat retention, and can realize a warm environment at an early stage.

中 Filling is generally used in a futon, cushion or clothing that comes in contact with the skin. For example, in a futon, it is important to obtain a comfortable bed temperature of a comfortable temperature and humidity. For this purpose, it is preferable to obtain sustained heat retention and moisture absorption heat generation. As conventional batting, many things using general-purpose fibers, such as polyester, and those using cross-linked acrylic moisture-absorbing and releasing fibers (see Patent Document 1) have been proposed.

However, batting using general-purpose fibers such as polyester is sufficiently high in bulkiness and can maintain high heat retention by containing a lot of air, but it absorbs the moisture in the captured air and converts it to comfortable air There was a problem that could not be done. In addition, the batting using the conventional Na salt type cross-linked acrylic moisture-absorbing / releasing fiber can be changed to air comfortable for the human body by absorbing moisture from the air contained in the batting and generating heat, Due to the low bulkiness, there was a problem with the sustainability of the heat retention effect.

In response to such a problem, the applicant has proposed a batting that further contains Mg salt type and / or Ca salt type cross-linked polyacrylate fibers in the batting containing polyester fibers (see Patent Document 2). This batting has moisture absorption exothermic property and bulkiness at a high level, and can be comfortably used for bedding and clothing.

However, Mg salt type and / or Ca salt type cross-linked polyacrylate fibers have a problem that the user cannot immediately feel the warmth because the moisture absorption exothermic property does not rise to a high temperature in a short time. There was room for further improvements in materials.

Japanese Patent Laid-Open No. 10-313995 Japanese Patent No. 5242661

The present invention was devised in order to solve the problems of the prior art including Patent Document 2, and has an initial temperature rising speed with respect to moisture exothermicity, and also has a high level of bulkiness. An object of the present invention is to provide a batting suitable for bedding and clothing, which can realize a warm environment comfortable to the human body at an early stage.

In order to achieve the above object, the present inventor further increases the initial temperature rise due to hygroscopic heat generation while maintaining the bulkiness of the Mg salt-type and Ca salt-type crosslinked polyacrylate fibers of Patent Document 2. As a result of intensive studies on the means for achieving this, Na salt type or K salt type is adopted as the cross-linked polyacrylate fiber to increase the initial temperature rise due to hygroscopic heat generation, and the bulkiness which is a drawback of Na salt type or K salt type By using a specific composite structure to compensate for the low nature, it was found that warmth based on the initial high temperature rise due to hygroscopic exotherm can be realized at an early stage without sacrificing bulkiness, and the completion of the present invention It came.

In addition, the graph which shows transition of the temperature for every elapsed time of 100% filling of Na salt type or Mg salt type cross-linked polyacrylate fiber measured according to the measurement method and conditions of ISO18782: 2015 is shown in FIG. As can be seen from FIG. 1, with 100% cross-linked polyacrylate fiber, the Na salt type is superior to the Mg salt type in terms of initial rise temperature based on hygroscopic heat generation.

That is, the present invention has been completed based on the above findings and has the following configurations (1) to (4).
(1) A batting containing 40 to 90% by weight of polyester fiber and 10 to 60% by weight of Na salt type and / or K salt type cross-linked polyacrylate fiber, wherein Na salt type and / or K The center of the side-by-side structure in which the salt-type cross-linked polyacrylate fiber is composed of a cross-linked structure and a surface layer portion having a Na salt type and / or K salt type carboxyl group, and two types of acrylonitrile-based polymers having different acrylonitrile contents. A batting characterized in that the area occupied by the surface layer portion in the cross section of the composite fiber is 5% or more and less than 20%.
(2) The batting according to (1), wherein the crosslinked polyacrylate fiber is a Na salt type.
(3) The bed temperature measured after 5 minutes after starting sweating 10 minutes under conditions of 15 ° C. and 50% RH is 30 ° C. or more, and the bed humidity is 70% or less. The batting described in (1) or (2).
(4) The batting according to any one of (1) to (3), wherein the specific volume is 50 to 100 cm ³ / g.

The batting of the present invention can not be achieved with conventional batting using general-purpose fibers such as polyester or cross-linked polyacrylate fibers such as Mg salt type and Ca salt type. Has the effect of achieving both at a high level. Such an effect is brought about not only by the bulkiness of the polyester fiber, but also by the high bulkiness of the specific composite structure of the Na salt type or K salt type cross-linked polyacrylate fiber and the hygroscopic exothermic property that exhibits a high temperature at an early stage. It is what The batting of the present invention can quickly change a large amount of moist air taken in due to its high bulkiness to warm air with low humidity due to quick moisture absorption and heat generation, so that the bedding batting, autumn / winter outdoor When used as a cotton pad for clothing, the wearer can feel warmth and heat retention at an extremely fast stage.

It is a graph which shows transition of the temperature for every elapsed time of 100% filling of Na salt type or Mg salt type cross-linked polyacrylate fiber measured according to the measurement method and conditions of ISO18782: 2015.

Hereinafter, the batting of the present invention will be described in detail.

The batting of the present invention contains moist air at a low humidity at an early stage by containing polyester fiber and a specific composite structure of Na salt type and / or K salt type cross-linked polyacrylate fiber in a specific ratio. It is characterized by a high level of moisture absorption exothermicity that converts to warm air and bulkiness that provides sustained heat retention.

As the polyester fiber used in the present invention, a polyester polymer usually used for cotton can be used, but polyethylene terephthalate fiber is preferable. Examples of the form include regular products that are not specially processed, conjugate products, hollow products, conjugate hollow products, etc., in order to obtain high bulkiness as a batting containing a crosslinked polyacrylate fiber having hygroscopicity. Regular products that are not specially processed are preferred.

In order to obtain high bulkiness of the batting, the polyester fiber preferably has a single fiber fineness of 5 to 18 dtex, more preferably 5 to 14 dtex. The fiber length is preferably 40 to 100 mm, and more preferably 50 to 80 mm. The single fiber elastic modulus of the polyester fiber is preferably 28 cN / dtex or more, and more preferably 30 cN / dtex or more for high bulkiness of the batting. The upper limit of the single fiber elastic modulus of the polyester fiber is not limited, but is practically about 100 cN / dtex. A polyester fiber having a high single fiber elastic modulus can be obtained by using, for example, polyethylene terephthalate or polyethylene naphthalate.

The polyester fiber content in the batting of the present invention is 40 to 90% by weight, preferably 45 to 85% by weight, more preferably 50 to 80% by weight. When there are few polyester fibers than the said range, it will become difficult to achieve high bulkiness, and there is a possibility that a lot of air cannot be included in batting, and high heat retention cannot be maintained. Further, when the polyester fiber is more than the above range, the content of the crosslinked polyacrylate fiber decreases, so that the moisture absorption exothermic effect of the crosslinked polyacrylate fiber cannot be fully enjoyed, and the heat retention cannot be maintained at low humidity. There is a fear. In the batting of the present invention, general-purpose fibers (fibers such as acrylic and cotton) other than polyester fibers can be used as long as the bulkiness of the entire batting is not affected.

The cross-linked polyacrylate fiber used in the present invention needs to be a monovalent metal Na salt type and / or K salt type. Each of the Na salt type and the K salt type may be used alone, or both types may be used in combination. Mg salt type or Ca salt type divalent metal salt type has high moisture absorption exothermic property and moderately high bulkiness, but since the initial rise temperature during moisture absorption exotherm is low, warmth and heat retention can be achieved early. There is a problem if you want to feel it. In addition, other divalent metal salt types such as a Zn salt type are not preferable because they are inferior in hygroscopic heat generation and a comfortable environment cannot be obtained. The monovalent metal salt type of the Na salt type or the K salt type has a high initial temperature rise during the hygroscopic heat generation, and thus can feel warmth at an early stage. However, the Na salt type or the K salt type has a special composite structure as described later in the present invention because the bulkiness is insufficient in the normal fiber form and the heat retention cannot be maintained.

The Na salt type and / or K salt type cross-linked polyacrylate fiber used in the present invention has two types of cross-linking structure and a surface layer portion having a Na salt type and / or K salt type carboxyl group, and different acrylonitrile contents. It is a composite fiber composed of a central part of a side-by-side structure composed of an acrylonitrile-based polymer, and the area occupied by the surface layer part in the cross section of the composite fiber needs to be 5% or more and less than 20%. The cross-linked polyacrylate fiber of the present invention has a composite structure consisting of a central portion and a surface layer portion around the center portion, and contributes to an improvement in bulkiness by creating a hard and elastic structure in the central portion. It is characterized by having a role of high moisture absorption exothermicity by having a cross-linked structure and a Na salt type and / or K salt type carboxyl group in the part. In the present invention, since the area occupied by the surface layer portion in the cross section of the cross-linked polyacrylate fiber is as small as less than 20%, it seems that high moisture absorption exothermic property cannot be realized, but it is less by the method described later. Since the amount of carboxyl groups is also increased in the surface layer portion, high moisture absorption exothermic properties can be expressed. However, if the area occupied by the surface layer portion is less than 5%, a sufficiently high hygroscopic exothermic property cannot be exhibited. The crosslinked polyacrylate fiber of the present invention can have 3.5 mmol / g or more with respect to the total amount of carboxyl groups, and can be up to about 10 mmol / g. Moreover, regarding the moisture absorption rate prescribed | regulated by the below-mentioned Example, 20% or more, Furthermore, 30% or more can be achieved and it is possible to about 70% at the maximum.

The crosslinked polyacrylate fiber of the present invention uses an acrylonitrile fiber as a raw fiber, and the acrylonitrile fiber can be produced from an acrylonitrile polymer by a known method. The acrylonitrile polymer preferably has an acrylonitrile content of 50% by weight or more, more preferably 80% by weight or more. The crosslinked structure can be introduced into the fiber by reacting the nitrile group of the acrylonitrile polymer with a nitrogen-containing compound such as a hydrazine compound.

The crosslinked polyacrylate fiber of the present invention has a composite structure in which two acrylonitrile polymers having different acrylonitrile contents are joined side by side. By giving a difference in the acrylonitrile content in this way, it is possible to bring about a difference in the amount of cross-linked structure introduced into each polymer region, thereby allowing crimps due to shrinkage to be expressed during the hydrolysis treatment, As a result, it can contribute to the improvement of bulkiness. In order to sufficiently improve the bulkiness, the difference in acrylonitrile content between the two acrylonitrile polymers is preferably 1 to 5% by weight, and the composite ratio of the two acrylonitrile polymers is It is preferably 30/70 to 70/30 (weight ratio).

A cross-linked structure is introduced into the surface layer of the fiber having a composite structure as described above. For the introduction of the crosslinked structure, it is preferable to use a crosslinking agent such as a nitrogen-containing compound. As the nitrogen-containing compound, it is preferable to use an amino compound or a hydrazine compound having two or more primary amino groups. After the cross-linked structure is introduced, a hydrolysis treatment with an alkali metal compound is performed to convert the nitrile group in the surface layer portion into a carboxyl group. These carboxyl groups include Na salt type or K salt type salt type carboxyl groups and H type carboxyl groups, and it is preferable to increase the number of salt type carboxyl groups. In practice, two types of acrylonitrile polymers with different acrylonitrile contents are joined with a side-by-side structure to introduce a cross-linked structure and hydrolyze to form carboxyl groups, and Na and / or K are added to the counter ions. Select to obtain the desired cross-linked polyacrylate fiber. However, in the present invention, the hydrolysis treatment is performed under a milder condition of an alkali metal compound having a lower concentration than before, and the subsequent acid treatment is performed under severer conditions at a higher temperature than in the past. By doing so, the crosslinked polyacrylate fiber of the present invention can have a structure in which more carboxyl groups are present in the narrow surface layer than in the past and the acrylonitrile polymer is preserved in the center.

In the cross-linked polyacrylate fiber of the present invention, the area occupied by the surface layer in the cross section is 5% or more and less than 20%, preferably 10% or more and less than 20%. The area of the surface layer part is measured by the method described in Examples described later. The area occupied by the surface layer portion of the fiber of the present invention is very small, and the area of the central portion where almost no carboxyl group is present occupies a large area. Therefore, the bulk of the fiber due to moisture absorption and the adoption of Na salt type or K salt type High bulkiness can be achieved without the effect of lowering the properties. In addition, as shown in FIG. 1, the Na salt-type or K-salt type cross-linked polyacrylate fiber has a high moisture absorption exothermic property (particularly, an initial rise temperature) as compared with a divalent metal salt such as an Mg salt type. In the present invention, the features can be enjoyed as they are.

The content of the Na salt type or K salt type cross-linked polyacrylate fiber in the batting of the present invention is 10 to 60% by weight, preferably 15 to 55% by weight, more preferably 20 to 50% by weight. When the content is less than the above range, the hygroscopic exothermic property is not sufficiently exhibited, and the captured moist air cannot be sufficiently changed to warm air with low humidity. When the above range is exceeded, the use of a large amount of expensive cross-linked polyacrylate-based fibers makes it impossible to improve the effect, which is economically disadvantageous. The Na salt type or K salt type cross-linked polyacrylate fiber preferably has a single fiber fineness of 5 to 20 dtex, more preferably 5 to 15 dtex. The fiber length is preferably 20 to 100 mm, more preferably 30 to 80 mm. Since the Na salt type or K salt type cross-linked polyacrylate fiber adopts the above-mentioned special structure, the area of the center portion of the hard elasticity is increased as much as possible especially in the cross-sectional shape, and moisture absorption is performed. Since the structure that reduces the area of the surface layer as much as possible is adopted, the bulkiness is quite high. Therefore, the Na salt type or K salt type cross-linked polyacrylate fiber can have a high bulkiness equivalent to or higher than that of conventionally used Mg salt type or Ca salt type.

The batting of the present invention contains a specific amount or more of the above-mentioned specially-structured Na salt type and / or K salt type cross-linked polyacrylate fiber together with the polyester fiber as described above. Moisture absorption in the range of 6.0 to 40% can easily be achieved within 5% under the RH environment. In particular, the batting of the present invention can realize the moisture absorption exothermic effect (high temperature rise) by the crosslinked polyacrylate fiber within the first 5 minutes when the human skin comes into contact.

Moreover, since the batting of the present invention contains a specific amount or more of the above-mentioned specially-structured Na salt type and / or K salt type cross-linked polyacrylate fiber together with the polyester fiber as described above, it is bulky. A specific volume in the range of 50-100 cm ³ / g can be achieved as an index. Such a high bulkiness is brought about by the high bulkiness of both the Na salt type or K salt type crosslinked polyacrylate fiber and polyester fiber having a special composite structure. When the specific volume is less than 50 cm ³ / g, heat retention may be insufficient because sufficient air is not taken in. If the specific volume is larger than 100 cm ³ / g, the shape may be easily lost by applying a small amount of force, and the shape retention may be insufficient.

Further, the batting of the present invention contains a specific amount or more of the Na salt type and / or K salt type cross-linked polyacrylate fiber having the above-mentioned special structure together with the polyester fiber as described above. According to the measurement method, the bed temperature measured at an early stage 5 minutes after the start of sweating after 10 minutes under conditions of 15 ° C. and 50% RH is 30 ° C. or higher (the upper limit is not limited, but in reality 36 ° C. or lower) ) And the bed humidity can be set to 70% or less (the lower limit is not limited, but in reality it is 20% or more). This is brought about by the high hygroscopicity and bulkiness of the special composite structure Na salt type or K salt type cross-linked polyacrylate fiber, and the high bulkiness of the polyester fiber. When the temperature and humidity in the bed are in this range, a comfortable warmth with low humidity can be realized when human skin comes into contact.

The method for producing the batting of the present invention is not particularly limited, and a conventionally known method for producing batting can be applied. For example, it is possible to apply a method in which raw cotton is preliminarily defibrated and mixed with a defibrator and then processed into a web shape with a card machine. In addition, for the purpose of imparting form stability, a process of entanglement of fibers such as a needle punch or a water punch, and an interfiber bonding process using a heat sealing resin may be added.

The batting of the present invention that has been described above has a comfort of an early low-humidity warmth that has not been heretofore, because it has both moisture-absorbing exothermic properties that can be felt early and high bulkiness. For this reason, bedding products (comforters, mattresses, pillows, etc.) or outer garments for autumn / winter using the batting of the present invention quickly become warm by adsorbing moisture released from the human body and generating heat at a high temperature at an early stage, Further, it is possible to continuously feel the warmth by the heat retention due to the high bulkiness.

The present invention will be specifically described with reference to the following examples, but the present invention is not limited thereto. In addition, the ratio in an Example is shown on a weight basis unless there is a notice. The evaluation method of characteristics in the examples is as follows.

(1) Moisture absorption About 2.5 g of the sample is dried with a hot air dryer at 105 ° C. for 16 hours and the weight is measured (W1 [g]). Next, the sample is placed in a thermo-hygrostat adjusted to 20 ° C. × 65% RH for 5 minutes. The weight of the sample thus absorbed is measured (W2 [g]). From these measurement results, the moisture absorption rate was calculated by the following equation.
Moisture absorption [%] = {(W2-W1) / W1} × 100

(2) Specific volume After lightly opening 50 g of the sample, it is opened and stacked by a card machine. Six test specimens are cut out so as to have a size of 10 cm × 10 cm, put into a bat and left in a thermo-hygrostat for 24 hours or more. Take out from the thermo-hygrostat, stack it so that the mass is 10.0g to 10.5g, and accurately weigh the test piece made. A 10 cm × 10 cm acrylic plate is placed on the test piece, a weight of 500 g is placed for 30 seconds, then the weight is removed and left for 30 seconds. This operation is repeated three times. After leaving the weight of 500 g and leaving for 30 seconds, the height of the four corners is measured to obtain an average value, and the specific volume is calculated by the following formula.
Specific volume (cm ³ / g) = 10 × 10 × measured average value of height of four corners of sample (mm) / 10 / mass of test piece (g)

(3) Bed temperature and bed humidity Using a sweating simulation measurement device, water supply amount (sweat amount): 100 g / m ² · h, hot plate temperature: 37 ° C., sample-hot plate distance: 0.5 cm, environment Temperature and humidity: Sweating was started 10 minutes after the start of the test under the condition of 15 ° C. × 50% RH, and changes in the temperature and humidity of the space between the hot plate and the sample after 5 minutes were measured.
The sweating simulation device includes a heat-producing sweating mechanism comprising a substrate having a sweating hole and a heat-producing body, a water-feeding mechanism for supplying water to the sweating hole, a heat-producing control mechanism for controlling the temperature of the heat-producing body, and temperature and humidity. It consists of sensors. The substrate is made of brass, has an area of 120 cm ² , is provided with six sweat holes, and is controlled at a constant temperature by a heat-producing body composed of a planar heater. The water supply mechanism uses a tube pump, and sends out a constant amount of water to the sweat holes of the substrate. Simulated skin made of a polyester multifilament woven fabric having a thickness of 0.1 mm is affixed to the surface of the base, whereby water discharged from the perspiration holes is spread on the surface of the base and a sweating state is created. An outer frame having a height of 0.5 cm is provided around the substrate, and the sample can be set at a position 0.5 cm away from the substrate. The temperature / humidity sensor is installed in the space between the substrate and the sample (a futon with a padding), and measures the temperature and humidity of the “space surrounded by the substrate, the sample and the outer frame” when the substrate is sweating. . In addition, the futon which put the batting was made using woven fabric of 100% polyester as a side fabric and quilting.

(4) Area ratio occupied by the surface layer portion The sample fiber is placed in a dyeing bath containing 2.5% cationic dye (Nichilon Black G 200) and 2% acetic acid with respect to the fiber weight, and the bath ratio is 1:80. After being soaked and boiled for 30 minutes, it is washed with water, dehydrated and dried. The obtained dyed fiber is sliced thinly perpendicular to the fiber axis, and the fiber cross section is observed with an optical microscope. At this time, the central portion made of the acrylonitrile-based polymer is dyed black, and the surface layer portion having many carboxyl groups becomes green because the dye is not sufficiently fixed. In the fiber cross section, the fiber diameter (D1) and the diameter (D2) of the center dyed black with the part starting to change from green to black as the boundary are measured, and the surface layer area ratio is calculated by the following formula To do. In addition, let the average value of the surface layer part area ratio of 10 samples be the surface layer part area ratio of a sample fiber.
Surface portion area ratio (%) = [{(( D1) / 2) 2 π - ((D2) / 2) 2 π} / ((D1) / 2) 2 π] × 100

[Example 1]
Acrylonitrile polymer Ap (90% by weight of acrylonitrile, 10% by weight of acrylic acid methyl ester (Intrinsic viscosity [η] = 1.5) in dimethylformamide at 30 ° C.), 88% by weight of acrylonitrile, 12% by weight of vinyl acetate Polymer Bp ([η] = 1.5) was dissolved in a 48% by weight aqueous rhodium soda solution to prepare a spinning dope. Each spinning undiluted solution is introduced into a compound spinning device according to Japanese Patent Publication No. 39-24301 so that the composite ratio (weight ratio) of Ap / Bp is 50/50, and spinning, washing, drawing, crimping and heat treatment are carried out according to conventional methods. Thus, a side-by-side raw material fiber in which the polymers Ap and Bp having a single fiber fineness of 3.3 dtex were combined was obtained.

The raw fiber was subjected to crosslinking introduction treatment and hydrolysis treatment simultaneously in an aqueous solution containing 0.5% by weight of hydrazine hydrate and 1.4% by weight of sodium hydroxide at 100 ° C. for 2 hours to obtain 8% by weight nitric acid. The solution was treated with an aqueous solution at 120 ° C. for 3 hours and washed with water. The obtained fiber is immersed in water, adjusted to pH 9 by adding sodium hydroxide, washed with water, and dried to form a Na salt type crosslinked polyacrylate fiber having a Na salt type carboxyl group (surface layer area 13%) ) The details of the obtained cross-linked polyacrylate fiber are shown in Table 1.

Na salt type cross-linked polyacrylate fiber (single fiber fineness 5.0 dtex, fiber length 48 mm) and polyester fiber (polyethylene terephthalate fiber, single fiber fineness 7.8 dtex, fiber length 64 mm, single fiber elasticity obtained as described above. A rate of 32 cN / dtex, product number 201-7.8Tx64 of Toray Industries, Inc. was defibrated and mixed to a weight ratio of 30/70 with a preliminary defibrator, and then a batting was made with a card machine. Table 1 shows the composition of the batting and the evaluation results.

[Example 2]
A batting was produced in the same manner as in Example 1 except that the weight ratio of the Na salt type crosslinked polyacrylate fiber and the polyester fiber was changed to 12/88. Table 1 shows the composition of the batting and the evaluation results.

[Example 3]
A batting was produced in the same manner as in Example 1 except that the weight ratio of the Na salt-type crosslinked polyacrylate fiber and the polyester fiber was changed to 20/80. Table 1 shows the composition of the batting and the evaluation results.

[Example 4]
A batting was produced in the same manner as in Example 1 except that the weight ratio of the Na salt-type crosslinked polyacrylate fiber and the polyester fiber was changed to 40/60. Table 1 shows the composition of the batting and the evaluation results.

[Example 5]
A batting was produced in the same manner as in Example 1 except that the weight ratio of the Na salt-type crosslinked polyacrylate fiber and the polyester fiber was changed to 50/50. Table 1 shows the composition of the batting and the evaluation results.

[Example 6]
A K salt type crosslinked polyacrylate fiber (surface area 13%) was obtained by the same method except that potassium hydroxide was used instead of sodium hydroxide added to adjust to pH 9 in Example 1. A batting was produced in the same manner as in Example 1 using this K salt type cross-linked polyacrylate type fiber (single fiber fineness 5.0 dtex, fiber length 48 mm) instead of the Na salt type cross-linked polyacrylate type fiber. Table 1 shows the composition of the batting and the evaluation results.

[Example 7]
In the same manner as in Example 1 except that the concentration of sodium hydroxide used for the crosslinking introduction / hydrolysis treatment was changed from 1.4% by weight to 1.6% by weight, the Na salt-type crosslinked polyacrylate fiber (surface layer area 18 %) Was obtained, and batting was made. Table 1 shows the composition of the batting and the evaluation results.

[Example 8]
In the same manner as in Example 1 except that the concentration of sodium hydroxide used for the cross-linking introduction / hydrolysis treatment was changed from 1.4% by weight to 1.2% by weight, Na salt-type cross-linked polyacrylate fiber (surface layer area 8) %) Was obtained, and batting was made. Table 1 shows the composition of the batting and the evaluation results.

[Example 9]
A batting was prepared in the same manner as in Example 1 except that the composition of the acrylonitrile polymer Ap was changed to 92% by weight of acrylonitrile and 8% by weight of acrylic acid methyl ester. Table 1 shows the composition of the batting and the evaluation results.

[Example 10]
A batting was produced in the same manner except that the composite ratio (weight ratio) of Ap / Bp was changed from 50/50 to 40/60 in Example 1. Table 1 shows the composition of the batting and the evaluation results.

[Example 11]
Instead of using Na salt type crosslinked polyacrylate fiber and polyester fiber in a weight ratio of 40/60 in Example 4, the same Na salt type crosslinked polyacrylate fiber as in Example 4 and the same polyester fiber and acrylic as in Example 4 were used. Filling was made in the same manner except that fibers (single fiber fineness 4.8 dtex, fiber length 50 mm, single fiber elastic modulus 10 cN / dtex) were used at a weight ratio of 30/60/10. The composition and evaluation results of this batting are shown in Table 1.

[Example 12]
Instead of using Na salt type crosslinked polyacrylate fiber and polyester fiber in a weight ratio of 30/70 in Example 1, the same Na salt type crosslinked polyacrylate fiber as in Example 1 and the same K salt type crosslinked as in Example 6 Filling was made in the same manner except that the polyacrylate fiber and the same polyester fiber as in Example 1 were used in a weight ratio of 15/15/70. The composition and evaluation results of this batting are shown in Table 1.

[Comparative Example 1]
A batting was produced in the same manner as in Example 1 except that the weight ratio of the Na salt-type crosslinked polyacrylate fiber and the polyester fiber was changed to 5/95. The composition and evaluation results of this batting are shown in Table 1.

[Comparative Example 2]
In the same manner as in Example 1 except that the concentration of sodium hydroxide used for the cross-linking introduction / hydrolysis treatment was changed from 1.4% by weight to 1.8% by weight, Na salt-type cross-linked polyacrylate fiber (surface layer area 25) %) And batting. Table 1 shows the composition of the batting and the evaluation results.

[Comparative Example 3]
Acrylonitrile polymer Ap (90% by weight of acrylonitrile, 10% by weight of acrylic acid methyl ester (Intrinsic viscosity [η] = 1.5) in dimethylformamide at 30 ° C.), 88% by weight of acrylonitrile, 12% by weight of vinyl acetate Polymer Bp ([η] = 1.5) was dissolved in a 48% by weight aqueous rhodium soda solution to prepare a spinning dope. Each spinning dope is introduced into a compound spinning device according to Japanese Examined Patent Publication No. 39-24301 so that the composite ratio of Ap / Bp is 50/50, followed by spinning, washing, drawing, crimping, and heat treatment according to conventional methods. A side-by-side raw material fiber in which the polymers Ap and Bp having a fiber fineness of 3.3 dtex were combined was obtained.

The raw fiber was subjected to crosslinking introduction treatment and hydrolysis treatment simultaneously in an aqueous solution containing 0.5% by weight of hydrazine hydrate and 1.4% by weight of sodium hydroxide at 100 ° C. for 2 hours to obtain 8% by weight nitric acid. The solution was treated with an aqueous solution at 120 ° C. for 3 hours and washed with water. The obtained fiber is immersed in water, adjusted to pH 9 by adding sodium hydroxide, and then immersed in an aqueous solution in which magnesium nitrate corresponding to twice the amount of carboxyl groups contained in the fiber is dissolved at 50 ° C. for 1 hour. As a result, an ion exchange treatment was carried out, followed by washing with water and drying to obtain an Mg salt-type crosslinked polyacrylate fiber having an Mg salt-type carboxyl group (surface layer area 13%). Using this Mg salt type cross-linked polyacrylate fiber (single fiber fineness 5.0 dtex, fiber length 48 mm) instead of the Na salt type cross-linked polyacrylate fiber, a batting was produced in the same manner as in Example 1. Table 1 shows the composition of the batting and the evaluation results.

[Comparative Example 4]
In the aqueous solution containing 0.5% by weight of hydrazine hydrate and 2.0% by weight of sodium hydroxide to the side-by-side type raw material fiber obtained in Example 1, 100 ° C. × 1 hour, crosslinking introduction treatment Then, the hydrolysis treatment was performed at the same time, and the mixture was further treated with an 8 wt% aqueous nitric acid solution at 100 ° C. for 1 hour and washed with water. The obtained fiber is immersed in water, adjusted to pH 9 by adding sodium hydroxide, and then immersed in an aqueous solution in which magnesium nitrate corresponding to twice the amount of carboxyl groups contained in the fiber is dissolved at 50 ° C. for 1 hour. As a result, an ion exchange treatment was carried out, followed by washing with water and drying to obtain a Mg salt-type crosslinked polyacrylate fiber (surface area 35%) having an Mg salt-type carboxyl group. Using this Mg salt type cross-linked polyacrylate fiber (single fiber fineness 5.0 dtex, fiber length 48 mm) instead of the Na salt type cross-linked polyacrylate fiber, a batting was produced in the same manner as in Example 1. Table 1 shows the composition of the batting and the evaluation results.

[Comparative Example 5]
A batting was produced in the same manner as in Example 1 except that 100% by weight of the same polyester fiber as in Example 1 was used. The composition and evaluation results of this batting are shown in Table 1.

[Comparative Example 6]
A batting was produced in the same manner as in Example 1 except that 100% by weight of the same acrylic fiber as in Example 11 was used. The composition and evaluation results of this batting are shown in Table 1.

As can be seen from Table 1, the batting of Examples 1 to 12 realizes a high bed temperature and a low bed humidity at an early stage because both high hygroscopicity and high bulkiness (specific volume) are compatible. Can be used very comfortably. On the other hand, Comparative Example 1 with few Na salt-type crosslinked polyacrylate fibers is inferior in hygroscopicity, Comparative Example 2 with a large surface layer area of Na salt type crosslinked polyacrylate fibers is inferior in bulkiness, and Mg salt type Comparative Examples 3 and 4 using a crosslinked polyacrylate fiber had a problem of poor hygroscopicity. Moreover, the comparative example 5 which uses only a polyester fiber has inferior hygroscopicity, and the comparative example 6 which uses only an acrylic fiber had a problem in hygroscopicity and bulkiness. The comparative examples having problems in either hygroscopicity and bulkiness cannot be said to be comfortable for humans because none of the comparative examples can create a good environment in the temperature and humidity in the bed.

The batting of the present invention has a high moisture absorption exothermic property that can be realized at an early stage and a high bulkiness that brings about heat retention, so that it can be comfortably used in bedding and clothing that touch human skin.

Claims

A filling containing 40 to 90% by weight of polyester fiber and 10 to 60% by weight of Na salt type and / or K salt type cross-linked polyacrylate fiber, wherein Na salt type and / or K salt type The cross-linked polyacrylate fiber has a cross-linked structure and a surface layer portion having a Na salt type and / or K salt type carboxyl group, and a central portion of a side-by-side type structure composed of two kinds of acrylonitrile-based polymers having different acrylonitrile contents. A batting characterized in that the area occupied by the surface layer portion in the cross section of the composite fiber is 5% or more and less than 20%.
2. The batting according to claim 1, wherein the crosslinked polyacrylate fiber is a Na salt type.
The bed temperature measured 30 minutes after starting sweating after 10 minutes under conditions of 15 ° C. and 50% RH is 30 ° C. or more, and the bed humidity is 70% or less. The batting according to 1 or 2.
The batting according to any one of claims 1 to 3, wherein the specific volume is 50 to 100 cm 3 / g.