JP2000345452A - Hardened staple fiber sparingly causing permanent set in fatigue - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hardened staple fibers sparingly causing permanent set in fatigue even after repeated use and having flame retardancy. SOLUTION: The hardened staple fibers comprise synthetic fibers, hot-melting type fibers and modified acrylic fibers. The hardened staple fibers feature containing at least >=5 wt.% fibers having a coefficient of static friction (μ s 0) of <=0.2 between fibers, having a char length of <=100 mm and the maximum char length of <=120 mm with respect to flame retardancy measured by the 45 deg. methenamine method and having a repeated compressive residual strain of <=10% by the JIS L-1074 method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard cotton which is used for mattresses and sheets, has little set even after repeated use, and has flame retardancy.

[0002]

2. Description of the Related Art Conventionally, hard cotton used as a mattress or a sheet mainly has a fiber / fiber static friction coefficient (.mu.s0) of 0.2 or more as a fiber serving as a base material. . In addition to this fiber, a low-melting thermoplastic resin fiber or a high-melting thermoplastic resin in the core and a core / sheath fiber having a low-melting point in the sheath as a heat-adhesive fiber are further added. Is formed.

However, there has been a problem that these hard cottons lose their adhesion points by repeated use, resulting in a lower bulk than the initial bulk. In order to solve this problem, for example, a method of lowering the density of the hard cotton and an improvement of the heat setting fiber have been proposed. However, in the method of lowering the density, when used for a futon or the like, a problem of a feeling of flooring occurs.

In general, silicon-treated cotton is easily burned and it is difficult to impart flame retardancy, and flame-retardant hard cotton using silicon-treated cotton has not been put to practical use.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to provide a hard cotton which is used for a mattress or a sheet, has little set even after repeated use, and has flame retardancy.

[0006]

The present invention has the following configuration to solve the above problems. That is, the present invention is as follows. 1. A hard cotton containing a synthetic fiber, a heat-adhesive fiber, and a modified acrylic fiber, wherein the hard cotton contains at least 5% by weight or more of a fiber having a fiber / fiber static friction coefficient (μs0) of 0.2 or less. The carbonization length in the evaluation of flame retardancy by the 45 ° mesenamine method was 100 mm or less, and the maximum carbonization length was 12
A flame-retardant hard cotton with less settling, having a flame retardancy of 0 mm or less and a residual compression set of 10% or less according to the JISL-1074 method. 2. The fiber / fiber static friction coefficient (μs0) is 0.2
2. The flame-retardant hard cotton with less settling according to the above 1, wherein the following fibers are provided with a silicone resin. 3. 3. The flame-retardant hard cotton with less settling as described in the items 1 to 2, wherein the modified acrylic fiber has a crosslinked structure and has a carboxyl group which is metallized. 4. The metal salt is selected from Ca, Mg, and Al.
4. The flame-retardant hard cotton with low sett as described in 3 above, which comprises a seed or two or more metal salts as an essential component.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a hard cotton which is used for a mattress or a sheet, has little set even after repeated use, and has flame retardancy. The fiber used in the hard cotton of the present invention is a natural fiber, an inorganic fiber, a recycled fiber or a synthetic fiber, preferably a polyester fiber, a polyolefin fiber, a synthetic fiber such as an acrylic fiber as a main component. In this case, the fibers used are as follows. Further, as the fiber used in the present invention, a fiber into which titanium oxide, an antibacterial agent, an antifungal agent or the like has been kneaded, or a fiber provided with various functions by post-processing can be used.

The fiber used as the base material of the hard cotton has a fineness of 1.5 to 3 in order to give a moderate bulkiness and a soft texture.
0 denier, preferably 3 to 20 denier, more preferably 6 to 18 denier, and the fiber length is 10 to 100.
mm, preferably 50-80 mm polyester short fibers are suitable. If the fineness is less than 1.5 denier, the bulk is less likely to appear, and if it is 30 denier or more, the texture tends to be hard. When the fiber length is shorter than 10 mm, the entanglement between the fibers is poor, and it is difficult to form the structure. When the fiber length is longer than 100 mm, the opening property and the cotton-forming property tend to deteriorate.

The matrix fiber is preferably subjected to mechanical crimping in order to improve bulkiness, texture, resilience to compression or cotton-forming property. A crimped one is more preferred. The number of crimps is preferably 5 to 30 pieces / inch, more preferably 10 to 20 pieces / inch, and the degree of crimp is preferably 5 to 40%, more preferably 10 to 35%. If the number of crimps is 5 / inch or less, and the degree of crimp is 5% or less, uniform spreading is not performed during the spreading process, and spots are likely to occur on the spread web. If the number of crimps is 30 pieces / inch or more and the degree of crimp is 40% or more, the texture of the product after opening the card tends to be poor.

The cross section of the fiber may be a solid fiber or a hollow cross section for imparting heat retention, or a modified cross section.

The heat-adhesive fiber has a low melting point polyolefin fiber or a core-sheath structure, and the melting point of the sheath component is 50 ° C. or more lower than the melting point of the core component, and the melting point of the sheath component is 70 ° C.
Polyester fibers having a melting point of from 50 to 210 ° C. and a melting point of 50 ° C. or higher than the above-mentioned fibers are used.

The fibers having a fiber / fiber static friction coefficient (μs0) of 0.2 or less in the present invention preferably have a fiber / fiber static friction coefficient (μs0) of 0.16 or less;
More preferably, it is 0.13 or less. If it is higher than 0.2, it is difficult to obtain the effect of the present invention, and the problem of sag cannot be solved.

The method for obtaining a fiber having a fiber / fiber static friction coefficient (μs0) of 0.2 or less is not particularly limited. For example, an oil agent containing a propylene oxide-ethylene oxide polyether as a main component is applied. There is a way to do that. Further, it can be obtained by applying a silicon-based resin to cover the fiber surface.

Examples of the silicone resin include resins mainly composed of modified silicon such as amino-modified organopolysiloxane and epoxy-modified organopolysiloxane and a curing agent reactive therewith.

[0015] As a method of applying the silicon-based resin,
There is a method such as a spinning step, a drawing step, or a cotton step in which an oil agent is applied by a shower method or a dipping method, followed by drying and heat treatment, and is not particularly limited. The fineness of the fiber having a fiber-to-fiber static friction coefficient (μsO) of 0.2 or less is not particularly limited, but when a modified acrylic cross-linked highly hygroscopic fiber is used, the bulk is less likely to appear and the hardness is lower. Therefore, it is preferable that the fiber is higher than the acrylic crosslinked high hygroscopic fiber.

What is the modified acrylic fiber in the present invention?
Acrylic fibers in which polar groups such as CN groups and -CONH ₂ groups are cross-linked by a cross-linking agent, and -COOH groups are metal chlorides. And the residual nitrile group is modified to introduce a carboxyl group or an amide group, wherein the carboxyl group is an acid type (H type)
And a salt type bonded to a metal.

The types of the metal salts include alkali metals such as Na and K, alkaline earth metals such as Ca and Mg, and aluminum.
Preferably, the salt is at least one of a, Mg, and Al.

Regarding the content of each fiber constituting the hard cotton, the coefficient of static friction between fibers (μs0) is 0.2
5% by weight or more, preferably 20% or less
% By weight or more. If the amount is less than 5% by weight, the texture becomes hard, and the effect of hardly sagging is difficult to obtain. The heat-adhesive fiber is not particularly limited, but if it is contained in an amount of 50% by weight or more, the hand tends to be hard. The purpose of the modified acrylic fiber is to increase the flame retardancy, and the content is not particularly limited as long as the flame retardancy passes the standard.

The laminating method may be an air-lay method or a cross-layer method of laminating card webs. In addition, by causing confounding with a needle punch or the like, an effect of suppressing peeling can be obtained. The setting condition by heat is not particularly defined because it differs depending on the equipment and the like.

The hard cotton obtained above has a thickness of 3 mm.
More preferably 10 mm or more, and the density is 0.01 g.
/ Cm ³ or more and 0.1 g / cm ³ or less, preferably 0.02
g / cm ³ or more 0.07 g / cm ^3, more preferably not more than 0.03 g / cm ³ or more 0.05 g / cm ^3. If the thickness is less than 3 mm, the coefficient of static friction between fibers / fibers (μ
The effect on the sag of the fiber having s0) of 0.2 or less is difficult. When the density is less than 0.01 g / cm ³ , the resilience is weak. For example, when used in a mattress or the like, a problem of feeling of flooring during use is likely to occur. 0.1 g / cm ³
If the temperature is higher, the efficiency of heat setting at the time of production is reduced, and the problem that the hard cotton becomes too hard tends to occur.

[0021]

When a polyester-based flame-retardant fiber is generally burned, the fiber is melted, the burning point drops, and the flame is hardly spread. As a result, the structure using the fiber is hardly burned. However, in a structure in which the fiber and the silicon-processed fiber are mixed, the flame spreads along the silicon until the polyester fiber melts and falls, and the flame-retardant effect is lost. On the other hand, the modified acrylic fiber used in the present invention is a highly crosslinked product, and is carbonized without being melted even when burned, so that the flame is extremely difficult to spread and spread, and the structure is obtained even when silicon-treated fiber is mixed. The flame retardant effect as a body is exhibited.

[0022]

Next, the present invention will be described in more detail with reference to examples. The measuring methods of various characteristics described in the present invention are as follows. (Fiber / fiber static friction coefficient μs0) JIS L-107
It measured according to the method of 4-1977.6-12. (Repeated compression residual strain) Measured according to the method of JIS K6401.

(45 ° Mecenamine Method) March 1997, Japan Flame Retardant Association, “Flame Resistant Products”
67 Regarding fillings listed in the performance test standards for flameproof products
The measurement was performed according to the 5 ° mesenamin basket method. However, the test pieces were each performed in a state of hard cotton.

EXAMPLES First, each fiber used in the examples will be described. (Fibers having a fiber / fiber static friction coefficient (μs0) of 0.2 or less: fiber A) Polyester fibers having a denier of 15 denier, a cut length of 76 mm, a number of crimps of 10 / inch, a degree of crimp of 23%, and a hollow ratio of 35%. A commercially available silicone resin liquid containing dimethylpolysiloxane as a main component was uniformly attached by a sprayer and fixed by heat treatment.

(Modified acrylic fiber: fibers B-1 and B
-2) Single fiber fineness of acrylonitrile (AN) / methyl acrylate (MA) = 90/10 (weight ratio) 1.5
d. After obtaining a raw fiber having a cut length of 52 mm, the fiber is treated with a 22% aqueous hydrazine solution at 100 ° C. for 5 hours and with a 10% aqueous NaOH solution at 90 ° C. for 2 hours, and then washed with water and treated with a 1N hydrochloric acid aqueous solution. Then, the fiber was washed with water to obtain a fiber in which the carboxyl group became H type. This fiber is treated with a Ca (OH) ₂ aqueous solution at 60 ° C. for 30 minutes,
Ca salt type / H type carboxyl group equivalent ratio of 2.5 / 1.0
The modified acrylic fiber (B-1) was obtained. In addition, Ca (O
Instead of H) ₂ aqueous solution treatment, NaOH aqueous solution treated modified acrylic fibers (B-2) was also obtained.

(Thermo-adhesive fiber: Fiber C) A low-melting fiber having a denier of 110 ° C., which is a polyester fiber having a core-sheath structure of 4 denier and a cut length of 51 mm.

(Flame-retardant polyester fiber: Fiber D) Flame-retardant polyester (PET) fiber having a denier of 6 and a cut length of 64 mm, copolymerized with a phenylphosphonic acid derivative and containing 5000 ppm of phosphorus atoms.

(General polyester fiber: fiber E) Polyester (PET) fiber having a denier of 15 denier, a cut length of 64 mm, a number of crimps of 10 / inch, a degree of crimp of 23%, and a hollow ratio of 35%.

[0029]

[Table 1]

[0030]

According to the present invention, it is possible to obtain hard cotton having less settling and flame retardancy.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D06M 15/00 B68G 7/02 // B68G 7/02 D06M 15/72 D06M 101: 32 F-term (Reference) 3B096 AD04 BA01 4L033 AA04 AA05 AB01 AC05 AC15 BA57 BA99 CA59 CA70 DA05 4L047 AA17 AA28 AB02 BA09 CA20 CB01 CB05 CB10 CC06

Claims (4)

[Claims] 1. A hard cotton containing a synthetic fiber, a heat-adhesive fiber and a modified acrylic fiber, wherein at least a fiber having a fiber / fiber static friction coefficient (μs0) of 0.2 or less is contained in the hard cotton. 5% by weight or more, having a flame retardancy of 100 mm or less in carbonization length and a maximum carbonization length of 120 mm or less in the evaluation of flame retardancy by the 45 ° mesenamine method, and JIS L
Flame-retardant hard cotton with little settling, characterized by having a residual compression set of 10% or less according to the -1074 method. 2. The fiber / fiber static friction coefficient (μs)
2. The flame-retardant hard cotton with less settling according to claim 1, wherein the fibers having 0) of 0.2 or less are provided with a silicone resin. 3. The flame-retardant hard cotton with low settling according to claim 1, wherein the modified acrylic fiber has a crosslinked structure and has a carboxyl group that is metal-salt-treated. 4. The method according to claim 3, wherein the metal salt has one or more metal salts selected from Ca, Mg, and Al as essential components. Flammable cotton.