JP3474992B2 - Needle felt with shape memory - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is excellent in shape recovery,
The present invention relates to a needle felt having high mechanical strength and shape memory.

[0002]

2. Description of the Related Art Conventionally, needle felts have been used in various fields in various fields such as clothes, terriers, roofing materials, interior materials for automobiles, reinforcing materials for construction, filters and felts for papermaking. Especially, when it is used as an industrial product, it is fatigued, deformed, and abraded by various stresses received from the environment during the use period, and finally it breaks and breaks its role, but it is required for industrial use until the end. It is necessary to maintain mechanical strength and durability of function.

In recent years, polymer compounds having a shape memory property,
For example, the appearance of trans-polyisoprene with a cross-linking structure at the shape memory point (stationary phase), polynorbornene with a pseudo-cross-linking structure, polyurethane with a crystalline region or glassy region, and styrene / butadiene copolymer Along with this, the development of fiber products having high morphological stability and shape recoverability is frequently carried out using the material. Specifically, a nonwoven fabric sheet having a shape memory property (Japanese Patent Laid-Open No. 61-2523).
No. 53), a special yarn having shape memory property (Japanese Patent Laid-Open No. 1-22)
No. 9836), a woven fabric having shape memory (Japanese Patent Laid-Open No. 2-11).
No. 2433), shape memory net (Japanese Patent Laid-Open No. 3-45744).
No.), spun yarn having shape memory ability (Japanese Patent Application Laid-Open No. 5-4412).
No. 8), shape memory woven and knitted fabric (JP-A-5-247778)
Are known.

[0004]

However, a woven fabric, a knitted fabric, or a conventional woven fabric made of a polymer compound having a shape memory property,
Nonwoven fabrics are mainly spun yarns and filaments with a fineness, and have a soft texture, but have low compression recovery, and the structure is deformed by repeated compression use, which is required for industrial applications. The mechanical strength and the durability of the function have not been satisfied yet.

Therefore, an object of the present invention is to provide a needle felt that is sufficiently satisfactory in terms of mechanical strength and durability of function, that is, durability of strength and shape, which cannot be achieved by conventional techniques.

[0006]

In order to achieve the above object, the present invention provides a woven fabric containing a monofilament made of a polymer compound having a shape memory property and a short fiber made of a polymer compound having a shape memory property. the needle punching bonding and comprising laminate and vat containing, defining the heat recovery process temperature Tr = Tg + 2 (Tm- Tg) / 3, Ah Rui heat recovery process temperature Tr = Ts + 20 ~Ts + 50 , the heat treatment temperature Ts = The shape was memorized after heat treatment was performed at Tg + (Tm−Tg) / 3 to define a heat recovery treatment.

In addition, the woven fabric has a multi-woven structure, and the ups and downs of the yarns are increased so that the compression recovery property and the sustainability of the woven fabric and the fatigue and deformation of the woven fabric during the period of being used as an industrial product are improved. The function of recovering the shape, that is, the shape recoverability is excellent.

Further, the monofilament has a fiber diameter of at least 0.15 mm or more, and whether it is a monofilament single yarn or a twisted yarn, the mechanical strength, shape recovery property, compression recovery property and resistance of the monofilament itself are maintained. It is designed to improve compression fatigue.

Further, the short fibers are 3 to 50.
By using a material having a fineness in the range of d, needle damage caused during needle punching and various stresses received from the environment as an industrial product, for example, fatigue, deformation and abrasion due to repeated stress such as compression press, tension and impact We are making it possible to expand the time to reach it.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In the figure, 1 is the needle felt of the present application, and the needle felt 1 is a woven fabric 2 containing a monofilament made of a polymer compound having a shape memory property.
And a bat 3 containing staple fibers made of a polymer compound having a shape memory property by needle punching adhesion, and heat-treated at a temperature not lower than the glass transition point and not higher than the melting point of the polymer compound. .

Examples of the polymer compound having the shape memory property include trans polyisoprene, polynorbornene, styrene / butadiene copolymer, nitrile / butadiene copolymer, polyurethane, crosslinked polyolefin, crosslinked polyamide, copolyester and the like. is there. Of course, it is not limited to these polymer compounds.

A polymer compound having excellent spinnability may be combined with the polymer compound. Examples of the polymer compound having excellent spinnability include polyamide, polyolefin, polyester, polyurethane, polyvinyl alcohol, acrylonitrile, and aramid. As for the polymer compound having excellent spinnability, if it is other than this, it is free to use it.

The woven fabric 2 is woven from monofilament single yarns made of a polymer compound having a shape memory property, or twisted yarns containing the single yarns. Particularly, it is preferable to use the monofilament as a warp thread on a loom. A woven fabric woven with monofilaments has higher mechanical strength than a woven fabric woven with spun yarn, and has a spring elastic action, that is, a higher compression recovery property.

As a form for giving the elastic action to the woven fabric 2, a multi-woven structure may be used as shown in the drawing. That is,
This is because the multiple weave design causes large ups and downs of threads. Since the thread ups and downs are a kind of crimp formed in the cross-sectional direction of the fabric, the original shape against the compressive recovery and sustainability of the fabric and the fatigue and deformation that the fabric undergoes during the period of being used as an industrial product. This is because it is excellent in the function (shape recoverability) that tries to recover. Generally, the larger the number of weft yarns loaded on the loom, the greater the ups and downs of the warp yarns.

The shape-retaining monofilament can be selected from commercially available products and can be spun by a wet method, a dry method or a melt spinning method. However, the mechanical strength and shape recovery of the monofilament itself, In order to improve the compression recovery property and the compression fatigue resistance, for example, a fiber diameter of 0.
15 mm or more, preferably 0.25 mm or more should be selected, and at least tensile strength of 2 g / d or more,
It is preferable to select one having 4 g / d or more.

Further, as the short fibers made of a polymer compound having a shape memory, fineness good those 3～50D. That is, it is possible to extend the period until fatigue, deformation, and abrasion due to needle damage received during needle punching adhesion and various stresses received from the environment as industrial products, such as compression press, tension force, and repeated stress such as impact. Is.

The bat 3 containing the shape-memory short fibers may of course be all the shape-memory fibers, but in addition to that, ordinary fibers such as nylon, polyester, and natural fibers are mixed-spun. You may use it.

Needle punching conditions for needle-punching and adhering the bat 3 containing the shape-retaining short fibers to one or both surfaces of the woven fabric 2 containing the shape-memory monofilament are not particularly limited. Satisfaction is achieved when the density is in the range of 200 to 1200 fibers / cm ² .

A laminate 4 is formed by needle-punching a woven fabric 2 containing the shape-memory monofilament and a bat 3 containing shape-memory short fibers.
The internal stress is fixed and the shape is memorized when it is cooled by leaving it in an atmosphere having a glass transition temperature or higher and a melting point or lower for a predetermined time for the constituent polymer compound.

As the shape memory processing method, for example,
When the melting point of the polymer compound is Tm, the glass transition temperature is Tg, and the heat treatment temperature is Ts (both in degrees Celsius), a heat treatment temperature Ts = Tg + (Tm-Tg) / 3 is suitable.

Further, in the case of a polymer compound having a shape memory property by cross-linking, the melting point is usually unclear, and the heat treatment temperature in such a case is higher than the glass transition temperature by about 30 ° C. It is essential to set to. Here, as the "heat treatment", it is sufficient to place the laminated body 4 under a very general method, for example, dry heat or wet heat, but for more effective treatment, a woven fabric or needle felt is used. The heat transfer should be maintained for at least 5 minutes.

Here, the glass transition temperature means, in practice, the temperature at which the maximum point of the tan δ ridge is the maximum in the rheological analysis of a molded article made of a polymer compound, for example, in the measurement of dynamic viscoelasticity.

In addition, the melting point is practically obtained from the thermal energy absorption peak obtained by the analysis of the thermal characteristics of the molded article made of the polymer compound, for example, the measurement result of the differential thermal analysis.

The internal stress of the above-mentioned shape-memory state, that is, the internal stress of the monofilament and the short fiber made of the polymer compound having the shape-memory property is not permanently fixed, but when it is used as an industrial product, Fatigue and deformation occur due to various stresses from the environment during its use. Of course, it is possible to recover the original shape by performing a predetermined heat recovery process.

Here, the predetermined heat recovery treatment is a temperature condition for relaxing the internal stress of the polymer compound in the shape-memorized state, that is, a temperature not lower than the glass transition temperature of the polymer compound is applied to the needle felt 1 of the present application. That is. That is,
It is preferable to set the temperature slightly higher than the shape memory processing temperature (20 to 50 ° C. higher). For example, when the melting point of the polymer compound is Tm, the glass transition temperature Tg, the heat treatment temperature is Ts, and the heat recovery treatment temperature is Tr (all degrees Celsius), the heat recovery treatment temperature Tr = Tg + 2 (Tm-Tg) / 3. The vicinity or the heat recovery processing temperature Tr = Ts + 20 is suitable.

A very general method for heat recovery treatment,
For example, it is sufficient to place the needle felt 1 of the present application under dry heat or moist heat, but in order to be more effective, the heat transfer should be maintained for at least 5 minutes.

The reason why the heat recovery treatment temperature is higher than the shape memory treatment temperature is to sufficiently relax the internal stress of the polymer compound. That is, in order to memorize the shape that has been memorized once again, heat treatment is performed at 20 to 50 ° C. higher than the initial heat treatment temperature to completely relax the initial stress, and again to lower the glass transition temperature. It may be cooled to the temperature of.

[0028]

EXAMPLES Next, the present invention will be specifically described with reference to examples. Of course, this does not limit the present invention. In addition, each characteristic value in the present embodiment is measured in the following manner.

Tensile strength (g / d): The load required for cutting monofilaments or short fibers is determined by the initial fineness (d) of the sample.
Expressed as the value divided by.・ Thickness (mm): Initial time (240 seconds) (240 seconds)
The value measured by a thickness measuring device under gf / cm ² ). Tensile strength (kg / cm): It is expressed as a value obtained by dividing the load required for cutting a woven fabric or needle felt by the initial width (cm). Compression Fatigue Test: JIS (L-1022) test method of textile floor coverings, in thickness reduction test method according to paragraph 7 repeated compression, set the compression pressure to 20 kgf / cm ^2,
The number of compression fatigue was 10,000 times. Calculation of shape memory effect: In the present invention, the calculation of the shape memory effect is represented by the following formula.

[0030]

[Example-1] A polymer compound having shape memory properties (polyurethane manufactured by Mitsubishi Heavy Industries, trade name Diary MM-550)
0: glass transition temperature 55 ° C, melting point 200 ° C) was melt-spun at a temperature of 235 ° C to prepare a monofilament having a fiber diameter of 0.35 mm. This monofilament was used as the warp yarn on the loom, while the monofilament twisted yarn made of nylon 6 (average fiber diameter 0.35 mm) was used as the weft yarn on the loom to form a warp double woven fabric.

On the other hand, the fineness 30d and melt-spun at a temperature 250 ° C the same polymer compound as a bat, fiber維長76
mm short fibers were prepared. What was made into a bat web was laminated on the upper and lower surfaces of the woven fabric of the warp double weave, and while it was flocked by the needle punching technique, a laminated body was obtained.

After that, the laminated body is kept at 105 ° without tension.
Place in a dryer in which hot air of C is refluxed and heat-treat for 10
It was applied for a minute, then taken out from the dryer and cooled by being exposed to cold air at 25 ° C. to remember the shape, and thus the needle felt of the present application was obtained. Here, the thickness was measured and defined as "thickness before fatigue". After the shape memory, the needle felt of the present application was cut into a required size and subjected to a compression fatigue test to measure the “thickness after fatigue”. This needle felt was placed in a dryer in which hot air of 125 ° C was refluxed without tension, heat recovery treatment was performed for 10 minutes to recover the shape, and then the fabric was taken out of the dryer and cooled in cool air of 25 ° C. Then, the sample was cooled by applying it to and the “thickness after shape recovery” was measured. The result is shown in FIG.

As is clear from FIG. 2, Example-1 has a shape memory effect of " 95 %" or more, and it is understood that the thermal recovery power after fatigue has a property of returning to the thickness before fatigue substantially.

[0034]

As described above, according to the present invention, a woven fabric containing a monofilament composed of a polymer compound having a shape memory property and a bat containing a short fiber composed of a polymer compound having a shape memory property are needle-punched and bonded. The heat recovery treatment temperature Tr = Tg + 2 (Tm-Tg)
/ 3, Oh Rui thermal recovery process temperature Tr = Ts + 20 ~Ts
+50 is defined, and the heat treatment temperature Ts = Tg + (Tm-T
g) / 3, it is characterized by heat treatment. Therefore, when the needle felt of the present invention is used as an industrial product, even if it is fatigued or deformed due to various stresses received from the environment during its use period, it is accurate. By performing the treatment at the heat recovery temperature, it is possible to recover the original shape.

The invention according to claim 2 is the woven fabric.
Is characterized by a multi-woven structure,
The sinking is large, the compression recovery of the fabric and its sustainability, and
This has the effect of improving the function of restoring the original shape.
To do.

Further, the invention according to claim 3 is such that
As a filament, at least 0.15 mm or more
Even if it is a monofilament single yarn, it can be twisted even if it has a fine diameter
Even if there is, the mechanical strength and shape of the monofilament itself
It can improve resilience, compression recovery and compression fatigue resistance.
It

Furthermore, the invention described in claim 4 is
Short staple fibers having a fineness in the range of 3 to 50 d
Needle received during needle punching by using
Damage and various stresses received from the environment as industrial products,
For example, due to repeated stress such as compression press, tension force, impact, etc.
It can extend the period until fatigue, deformation, and wear.
Has the effect.

[0038]

[0039]

[0040]

[0041]

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view schematically showing a needle felt of the present application.

FIG. 2 is a chart showing the fatigue test results of the needle felt of the present application.

[Explanation of symbols]

1 This application needle felt 2 textiles 3 bat 4 laminate

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-61-252353 (JP, A) JP-A-5-44128 (JP, A) JP-A-7-292568 (JP, A) JP-A-2- 289142 (JP, A) JP 5-132815 (JP, A) JP 5-33259 (JP, A) JP 5-163613 (JP, A) JP 59-53528 (JP, A) 52-168601 (JP, U) JP-B-40-11428 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) D04H 1/00-18/00 B32B 1/00 -35/00 D03D 1/00-51/46

Claims (4)

(57) [Claims] 1. A laminate obtained by needle-punching a woven fabric containing a monofilament made of a polymer compound having a shape memory property and a bat containing a short fiber made of a polymer compound having a shape memory property, and heat-bonding the laminated product. recovery processing temperature Tr = Tg + 2 (Tm- Tg) / 3, Ah Rui defines a heat recovery process temperature Tr = Ts + 20 ~Ts + 50 , characterized in that heat treatment at the heat treatment temperature Ts = Tg + (Tm-Tg ) / 3 Needle felt with shape memory. However, Ts = heat treatment temperature, Tr = heat recovery treatment temperature, T
g = glass transition temperature, Tm = melting point of polymer compound (all in degrees Celsius) 2. The needle felt having a shape memory property according to claim 1, wherein the woven fabric has a multi-woven structure. 3. The monofilament is at least 0.
A fiber having a fiber diameter of 15 mm or more.
Or a needle felt having a shape memory property according to 2. 4. The needle felt with shape memory according to claim 1, wherein the short fibers have a fineness in the range of 3 to 50 d.