JP2020051023A - Composite yarn - Google Patents

Abstract

To provide a fiber having a good temperature control function both at time of temperature rise and at time of temperature fall.SOLUTION: A synthetic fiber comprises a thermoplastic resin containing a component 1 and a component 2. The component 1 has a melting start temperature of 34°C or higher and a melting peak temperature of 50°C or lower. The component 2 has a crystallization start temperature of lower than 30°C and a crystallization peak temperature of 5°C or higher. In particular, a synthetic fiber preferably has: a melting heat value ΔHm of the component 1 of 10 to 150 J/g ; a crystallization heat value ΔHc of the component 2 of 10 to 150 J/g; a melting heat value ΔHm of synthetic fiber observed at 50°C or lower of 1 to 5 J/g; and a crystallization heat value ΔHc of 1 to 5 J/g observed at 50°C or lower.SELECTED DRAWING: None

Description

The present invention relates to a synthetic fiber having a temperature control function (temperature control fiber).

The temperature control fiber is a synthetic fiber provided with a function of alleviating a rapid temperature change when there is a temperature change of a temperature increase or a temperature decrease.
As such a temperature-controlling fiber, a material having a melting point near room temperature is encapsulated in a microcapsule, and a material in which the microcapsule is adhered to a base material, or a material in which the substance itself or the microcapsule is mixed in the fiber, have conventionally been used. It has been proposed (for example, Patent Documents 1 to 3).

JP-A-58-55699 JP-A-1-85374 Japanese Patent Publication No. 2004-510068

However, the above substances are substances having a melting point higher than the temperature in the garment (the temperature between the skin and the garment) of 31 to 32 ° C. (normally, present as a solid) or a substance having a lower melting point (normally, present as a liquid). Is combined with the fiber. In the former case, when the outside air changes above 31-32 ° C, the endothermic effect seen when the phase changes from solid to liquid appears, but when the outside air changes below 31-32 ° C, the phase changes from liquid to solid. There is no heating effect seen when changing. In the latter case, when the outside air changes to 31 to 32 ° C or higher, the endothermic effect seen when the phase changes from solid to liquid does not appear, but when the outside air changes to 31 to 32 ° C or lower, the liquid changes to solid. Exothermic effects appear during the phase change. As described above, at present, it has only one of the effects and the temperature control function is not sufficiently exhibited.
Therefore, an object of the present invention is to obtain a fiber having both a heat absorbing effect and a heat generating effect and having a good temperature control function.

The present inventors have combined two kinds of materials, a substance having a melting point lower than the temperature in the garment of 31 to 32 ° C. and a substance having a high melting point, into a fiber, and added two kinds of temperature control materials having specific properties to the fiber. It has been found that by containing the same, it is possible to exert a temperature control function at both rising and falling temperatures in all seasons, and to provide a comfortable clothing material, and reached the present invention.
That is, the present invention relates to a synthetic fiber comprising a thermoplastic resin containing Component 1 and Component 2, wherein Component 1 has a melting onset temperature of 34 ° C. or higher, a melting peak temperature of 50 ° C. or lower, and Component 2 The gist of the present invention is a synthetic fiber having a crystallization start temperature of less than 30 ° C. and a crystallization peak temperature of 5 ° C. or more.
In the above synthetic fiber, the heat of fusion ΔHm of the component 1 is 10 to 150 J / g, the heat of crystallization ΔHc of the component 2 is 10 to 150 J / g, and the heat of fusion ΔHm of the synthetic fiber observed at 50 ° C or lower is 1 to 10. It is preferable that the synthetic fiber has a heat of crystallization ΔHc of 1 to 5 J / g, which is observed at 5 J / g and 50 ° C. or lower.
Further, in the above synthetic fiber, it is preferable that a half width of a melting peak of the component 1 and a half value width of a crystallization peak of the component 2 obtained by differential scanning calorimetry are 10 ° C. or less.
Further, in the above synthetic fiber, the component 1 is a crystalline poly-α-olefin having a side chain carbon chain composed of at least one of C18, C20 and C22, and the component 2 is a side chain carbon chain having a carbon chain of C12 and C14. , C16, and more preferably a crystalline poly-α-olefin comprising at least one component. In particular, the mass ratio of Component 1, Component 2, and the thermoplastic resin is from 5: 5: 90 to 20:20:60. Is preferred.
The present invention also provides a synthetic fiber comprising a thermoplastic resin containing Component 1 having a melting start temperature of 34 ° C. or higher and a melting peak temperature of 50 ° C. or lower, a crystallization start temperature of less than 30 ° C., and a crystallization peak temperature. Is a composite yarn obtained by twisting synthetic fibers made of a thermoplastic resin containing Component 2 having a temperature of 5 ° C. or higher.

ADVANTAGE OF THE INVENTION According to this invention, the phase of the temperature control material can be sensitively changed with respect to the temperature change caused by the difference in the environment between summer and winter when moving from indoor to outdoor, from outdoor to indoor, and thus the skin-clothes. It is possible to provide a fiber having an excellent temperature control function capable of suppressing a rapid temperature change during the operation.

It is a figure which shows the temperature control function evaluation at the time of temperature rise (31 to 50 degreeC) of the fiber obtained from the Example of this invention and the comparative example. It is a figure which shows the temperature control function evaluation at the time of the temperature fall (31 degreeC-3 degreeC) of the fiber obtained from the Example of this invention and the comparative example. It is a figure explaining the evaluation method of a temperature control function. It is a figure which shows the temperature control function evaluation of the fiber obtained from the Example of this invention, and the comparative example.

Hereinafter, the present invention will be described in detail.
The present invention is a synthetic fiber made of a thermoplastic resin containing Component 1 and Component 2.
The melting point and the freezing point of the components 1 and 2 of the present invention are set before and after the temperature in clothes. Usually, the temperature in the garment is 31 to 32 ° C. At this temperature, when the temperature rises, an endothermic effect due to heat of fusion caused by a phase transition from the solid to the melt, and when the temperature falls, the temperature changes from the melt to the solid. It is configured to exhibit a heat-generating effect due to solidification heat caused by the phase transition, and to exhibit a good temperature control function both when the temperature is increased and when the temperature is decreased.
Hereinafter, the components 1 and 2 will be described in detail.

First, component 1 will be described. Component 1 has a melting onset temperature of 34 ° C. or higher and a melting peak temperature of 50 ° C. or lower. Especially, it is preferable that the melting start temperature is in the range of 34 ° C. or more and the melting peak temperature is in the range of 45 ° C. or less.
The temperature between the skin and the clothes is usually about 31 to 32 ° C. At this time, the component 1 exists as a solid, and when the outside air temperature rises, a phase transition from the solid to the melt occurs, and a rapid temperature rise inside the clothes can be suppressed by an endothermic effect.

Preferred examples of the component 1 include a polymer of acrylic acid or methacrylic acid, a derivative ester thereof and a wax, a side-chain crystalline polymer, and the like.
More specifically, for example, acrylic acid includes polyeicosyl acrylate, polynonadecyl acrylate, polyheptadecyl acrylate, polypalmityl acrylate, polypentadecyl acrylate, polystearyl acrylate, polylauryl acrylate, polymyristyl acrylate, etc. Or derivatives of these acrylic acids.
As methacrylic acid, polydocosyl methacrylate, polyphenicosyl methacrylate, polymyristyl methacrylate, polypentadecyl methacrylate, polypalmityl methacrylate, polyheptadecyl methacrylate, polynonadecyl methacrylate, polyeicosyl methacrylate, polyhestearyl methacrylate, Examples include poly (palmityl / stearyl) methacrylate and the like, or esters of these methacrylic acids.
Examples of the side-chain crystalline polymer include side-chain crystals such as α-olefin polymers (crystalline poly-α-olefins), alkyl acrylate polymers, alkyl methacrylate polymers, alkyl ethylene oxide polymers, polysiloxane polymers and acrylamide polymers. Polymer.
Among these, crystalline poly-α-olefin is particularly preferred. The crystalline poly-α-olefin may be a homopolymer or a copolymer with an olefin such as ethylene or propylene. Further, the carbon chain of the side chain is preferably any of C18, C20 and C22.

The heat of fusion ΔHm of the component 1 is preferably from 10 to 150 J / g, and more preferably from 60 to 150 J / g. Within this range, a good endothermic effect is likely to be obtained.

The half width of the melting peak of Component 1 obtained by differential scanning calorimetry is preferably 10 ° C. or less. More preferably, it is 5 ° C. or lower. Within this range, the melting peak of the component 1 in the DSC chart at the time of temperature rise is sharp, and the heat absorption effect at the pinpoint is excellent. In particular, the temperature control function at the time of temperature rise is excellent.

Next, the component 2 will be described. Component 2 has a crystallization onset temperature of less than 30 ° C and a crystallization peak temperature of 5 ° C or more.
The temperature between the skin and the clothes is usually about 31 to 32 ° C. At this time, the component 2 exists as a liquid, and when the outside air temperature drops, a phase transition from a melt to a solid occurs, and a rapid temperature drop inside the garment can be suppressed by the heat generation effect. By including these components 1 and 2, it is possible to have a temperature control function both when raising and lowering the temperature.

As the component 2, a substance similar to the component 1 described above is preferably used.
That is, a polymer of acrylic acid or methacrylic acid, a derivative ester thereof and a wax, a side chain crystalline polymer, or the like is preferably used.
More specifically, for example, acrylic acid includes polyeicosyl acrylate, polynonadecyl acrylate, polyheptadecyl acrylate, polypalmityl acrylate, polypentadecyl acrylate, polystearyl acrylate, polylauryl acrylate, polymyristyl acrylate, etc. Or derivatives of these acrylic acids.
As methacrylic acid, polydocosyl methacrylate, polyphenicosyl methacrylate, polymyristyl methacrylate, polypentadecyl methacrylate, polypalmityl methacrylate, polyheptadecyl methacrylate, polynonadecyl methacrylate, polyeicosyl methacrylate, polyhestearyl methacrylate, Examples include poly (palmityl / stearyl) methacrylate and the like, or esters of these methacrylic acids.
Examples of the side-chain crystalline polymer include side-chain crystals such as α-olefin polymers (crystalline poly-α-olefins), alkyl acrylate polymers, alkyl methacrylate polymers, alkyl ethylene oxide polymers, polysiloxane polymers and acrylamide polymers. Polymer.
Among these, crystalline poly-α-olefin is particularly preferred. The crystalline poly-α-olefin may be a homopolymer or a copolymer with an olefin such as ethylene or propylene. Further, the carbon chain of the side chain is preferably any of C12, C14 and C16.

Component 2 preferably has a heat of crystallization ΔHc of 10 to 150 J / g, more preferably 40 to 150 J / g. Within this range, a good heat-generating effect can be easily obtained.

The FWHM of the crystallization peak of Component 2 obtained by differential scanning calorimetry is preferably 10 ° C. or less. More preferably, it is 5 ° C. or lower. Within this range, the crystallization peak of the component 2 in the DSC chart at the time of temperature decrease is sharp, and the exothermic effect at the pinpoint is excellent. In particular, the temperature control function at the time of temperature decrease is excellent.

In the synthetic fiber of the present invention, various thermoplastic resins can be used.
Specifically, for example, polyamides such as polyamide 6 (hereinafter sometimes referred to as PA6), polyamide 66 and polyamide 12, polyesters such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate and polylactic acid, polyethylene and polypropylene And the like, or a polymer containing these as a main component.
A polyolefin-based thermoplastic resin is preferable in that it has excellent compatibility with the above components 1 and 2. Examples of such a polyolefin-based thermoplastic resin include polyethylene, polypropylene, polybutene, and polymethylpentene.

The synthetic fiber of the present invention is preferably a core-in-sheath type composite fiber in which a thermoplastic resin containing Component 1 and Component 2 is disposed in a core portion, and a thermoplastic resin capable of forming fibers is disposed in a sheath portion.
In this case, various thermoplastic resins as described above can be used as the thermoplastic resin for the core and the sheath.
In particular, a preferred combination of thermoplastic resins is to use a polyolefin-based thermoplastic resin for the core and a thermoplastic resin selected from polyester, polyamide, and polyolefin for the sheath.

In the present invention, when the above-mentioned core-sheath type conjugate fiber is used, it is preferable that the core is not exposed to the fiber surface from the viewpoint of temperature control function and handleability.
In this case, the composite fiber is made of an alloy resin composition obtained by melt-kneading the component 1, the component 2 and the thermoplastic resin as a core component and a thermoplastic resin selected from the above as a sheath component. Is preferred.

When the core-sheath type composite fiber is used, the core-sheath ratio (volume ratio) is preferably from 20:80 to 80:20, more preferably from 30:70 to 70: 30.
When the core-sheath type conjugate fiber is used, it may be a single core-sheath type or a multi-core multi-core type (sea-island type).

In addition, in the present invention, as a method for incorporating Component 1 and Component 2 into the thermoplastic resin, a method in which Component 1 and Component 2 are melt-kneaded with the thermoplastic resin, mixed, and then combined is preferable.
For example, the following methods can be considered for the composite method.
(1) Kneading three kinds of components 1 and 2 and a thermoplastic resin (formation of resin composition)
(2) A resin composition obtained by kneading the component 1 and the thermoplastic resin and a resin composition obtained by kneading the component 2 and the thermoplastic resin are blended when fiberizing. (3) Core part The two kinds of alloys obtained in (2) are arranged in a multi-island state in the component

Component 1: Component 2: The ratio (mass ratio) of the thermoplastic resin is preferably from 5: 5: 90 to 20:20:60 from the viewpoint of temperature control function and comfort as a clothing material. : 10:80 to 15:15:70.
In the case of the core-sheath type composite fiber, when the core contains Component 1: Component 2: Thermoplastic resin, the core preferably has the above ratio.

The synthetic fiber of the present invention may be a single fiber or a composite fiber made of a thermoplastic resin containing the components 1 and 2, or a core-sheath type composite fiber containing the above components 1 and 2 in the core. You may.

The synthetic fiber of the present invention preferably has a heat of fusion ΔHm of 1 to 5 J / g, which is observed at 50 ° C. or lower, from the viewpoint of the temperature control function, and a crystal of the synthetic fiber which is observed at 50 ° C. or lower. It is preferable that the heat of formation ΔHc be 1 to 5 J / g.

Further, the present invention is also a composite yarn in which synthetic fibers made of a thermoplastic resin containing the above component 1 and synthetic fibers made of a thermoplastic resin containing the above component 2 are combined. Each synthetic fiber used in the composite yarn of the present invention may be a single fiber or a composite fiber. In a particularly preferred embodiment, a core-sheath composite fiber containing the component 1 in the core portion and a core-sheath composite fiber containing the component 2 in the core portion are combined.
Preferable examples of the form of the composite yarn include (1) aligning the respective synthetic fibers, (2) blending the respective synthetic fibers by air entanglement and the like, and (3) twisting the respective synthetic fibers.

In the composite yarn of the present invention, the heat of fusion ΔHm of the composite yarn observed at 50 ° C or lower is preferably 1 to 5 J / g, and the crystal of the composite yarn observed at 50 ° C or lower, from the viewpoint of the temperature control function. It is preferable that the heat of formation ΔHc be 1 to 5 J / g.

Next, a method for producing the synthetic fiber of the present invention will be described.
Component 1 and Component 2 are compounded with a thermoplastic resin forming a core by a twin-screw kneader. A sheath thermoplastic resin is prepared. Each of the above two resins is melted using an extruder having a temperature equal to or higher than the melting point of the resin, preferably equal to or higher than 20 ° C. from the melting point. The molten resin is passed through a die for forming a core and a sheath, and the resin is extruded into a predetermined cross-sectional shape from a hole in the surface of the die to be fiberized. The extruded fiber is cooled by cold air, an oil agent is applied, and the fiber is wound. The wound fiber is stretched by applying heat, and heat-set to obtain the synthetic fiber of the present invention. The winding speed is not particularly limited, but is preferably from 700 m / min to 2000 m / min.

Hereinafter, the present invention will be described more specifically with reference to examples and specific examples, but the present invention is not limited thereto.

<Kneading>
Base resin: 80% by mass of polypropylene, 20% by mass of temperature control agent: One or more crystalline poly-α-olefins (described below as component 1 for a melting point of 40 ° C. and component 2 for a melting point of 29 ° C.) As a composition of the above, 8.0 kg / hr of polypropylene was supplied by a twin-screw kneader, melt-kneaded at 250 ° C., the cord-like melt was cooled with water, and pelletized by a pelletizer to obtain a polypropylene-based resin composition.
<Spinning>
Composite spinning was performed at a temperature of 250 ° C. using a melt extrusion type composite spinning machine using the polypropylene resin composition and polyamide 6 as main spinning raw materials.
At the time of spinning, the polypropylene resin composition is separately melted so that the core component and the polyamide 6 become the sheath component, and then combined with a core-sheath type spinneret into a core-sheath form and spun. Then, it was cooled and wound up at a spinning speed of 800 m / min while applying an oil agent. Thereafter, the film was stretched 3.0 times on a hot roller at 50 ° C., heat-set at 140 ° C. with a stretching roller, and wound up to obtain a synthetic fiber of 84 dtex / 24f.
<Production of tubular knitted fabric>
A tubular knitted fabric was produced from the obtained synthetic fiber or composite yarn using a tubular knitting machine (CR-B, manufactured by Eiko Sangyo Co., Ltd., 3.5 inches in diameter, 260 needles).
<Calibration analysis: melting peak temperature, crystallization peak temperature, melting start temperature, crystallization start temperature>
The measurement was performed using a differential scanning calorimeter (Diamond DSC: manufactured by PerkinElmer Japan). The heating and cooling rates were unified at 10 ° C./min. The temperature condition is 0 ° C to 60 ° C, the temperature is maintained at 60 ° C for 5 minutes, the temperature is lowered to 60 ° C to 0 ° C, the temperature is maintained at 0 ° C for 5 minutes, and the first scan is performed. The sample was held for 5 minutes, the temperature was lowered to 60 ° C. to 0 ° C., and the sample held at 0 ° C. for 5 minutes was used as a second scan. The melting peak temperature, crystallization peak temperature, melting start temperature, crystallization start temperature, heat of fusion, and heat of crystallization were calculated in accordance with JIS K7121.
<Evaluation of temperature control function>
A 10 cm square tubular knitted fabric (test sample) was allowed to stand in a hot air dryer set at 80 ° C. for 1.0 hr to completely melt the components 1 and 2, and then allowed to stand at 5 ° C. for 24 hr to solidify. The heat histories for 1 and component 2 were unified. The thermocouple type thermometer was wrapped in a tubular knitted fabric, allowed to stand for 1.0 hour at 31 ° C., which is the temperature between the skin and the clothes, and, after the temperature was stabilized, was transferred to a dryer set at 50 ° C. A change in temperature inside the fabric at a low temperature when transferred to a heat insulating container set at 3 ° C. or lower was confirmed.
The temperature difference from the test product was determined using a tubular knitted fabric made of a single yarn of polyamide 6 as a control product. From the obtained graph, the value of the maximum temperature difference and the area from the temperature difference graph 20 minutes after moving to a high temperature and 12 minutes after moving to a low temperature (the temperature difference graph of FIG. Area), and this was used as an evaluation index.
The larger the absolute value of the maximum temperature difference, the better the temperature control function.
Also, the larger the temperature difference area, the better the temperature control function.
The temperature control function (high temperature, low temperature) was evaluated in the following manner.
：: When the absolute value of the maximum temperature difference is 0.5 ° C or more
Δ: Absolute value of maximum temperature difference exceeds 0.4 ° C. and less than 0.5 ° C. X: Absolute value of maximum temperature difference is 0.4 ° C. or less

[Example 1]
A crystalline poly-α-olefin having a melting point of 29 ° C. was prepared as Component 2, and a crystalline poly-α-olefin having a melting point of 40 ° C. was prepared as Component 1. The components were simultaneously added at a composition of 10% by mass with respect to polypropylene. And kneaded to obtain a polypropylene resin composition. Then, by the spinning method, the resin composition was disposed on a core portion to obtain a core-sheath type composite fiber having a core-sheath ratio (volume ratio) of 67:33, and a tubular knitted fabric was produced by the method. .
The physical properties of Component 1 and Component 2 are as follows.

[Example 2]
A core-sheath type composite fiber was obtained in the same manner as in Example 1 except that the core-sheath ratio (volume ratio) was changed to 50:50, and a tubular knitted fabric was produced.

[Example 3]
As the component 2, a crystalline poly-α-olefin having a melting point of 29 ° C. was kneaded by the above-mentioned method at a composition of 20% by mass with respect to polypropylene to obtain a resin composition. A core-sheath type composite fiber A was obtained in the same manner as in Example 1, except that the obtained polypropylene-based resin composition was disposed on the core.
Next, as a component 1, a crystalline poly-α-olefin having a melting point of 40 ° C. was kneaded by the above-described method at a composition of 20% by mass with respect to polypropylene to obtain a resin composition. A core-sheath type composite fiber B was obtained in the same manner as in Example 1, except that the obtained polypropylene-based resin composition was disposed on the core.
The obtained core-in-sheath type composite fiber A and core-in-sheath type composite fiber B were aligned and combined to obtain a composite yarn, and a tubular knitted fabric was produced by the above method.

[Comparative Example 1]
Only a crystalline poly-α-olefin having a melting point of 29 ° C. was kneaded by the above method at a composition of 20% by mass with respect to polypropylene to obtain a resin composition. A core-sheath type composite fiber was obtained in the same manner as in Example 1 except that the obtained resin composition was disposed on a core portion, and a tubular knitted fabric was produced.

[Comparative Example 2]
Only a crystalline poly-α-olefin having a melting point of 40 ° C. was kneaded by the above method at a composition of 20% by mass relative to polypropylene to obtain a resin composition. A core-sheath type composite fiber was obtained in the same manner as in Example 1 except that the obtained resin composition was disposed on a core portion, and a tubular knitted fabric was produced.

[Comparative Example 3]
A core-sheath type conjugate fiber was obtained in the same manner as in Example 1 except that polypropylene was disposed on the core portion, and a tubular knitted fabric was produced.

[Comparative Example 4]
Polyamide single fiber of 84 dtex / 24f was prepared, and a tubular knitted fabric was produced by the above method.

Tables 1 and 2 show the raw materials, physical properties, core-sheath ratios, phase transition temperatures observed at 50 ° C. or lower, phase transition calories, and temperature control functions of the fibers and composite yarns obtained from Examples and Comparative Examples.

FIG. 1 shows that, in the evaluation of the temperature control function, the test article and the control article were each allowed to stand at 31 ° C. for 1.0 hour, and then the temperature change inside the cloth with the passage of time when moved to 50 ° C. was collected. FIG. 4 is a diagram showing a difference between a temperature change of an article and a temperature change of a control article. The larger the absolute value of the maximum temperature difference, the better the temperature control function. Also, the larger the area due to the temperature difference, the better the temperature control function.

FIG. 2 shows, in the evaluation of the temperature control function, the change in the temperature inside the cloth over time when the test article and the control article were allowed to stand at 31 ° C. for 1.0 hour and then moved to 3 ° C. It is the figure which showed the difference of the temperature change of the test sample and the control sample which were sampled. The larger the absolute value of the maximum temperature difference, the better the temperature control function. Also, the larger the area due to the temperature difference, the better the temperature control function.

FIG. 4 shows the temperature difference area value in the temperature control function. The Y-axis indicates that the larger the positive absolute value, the higher the temperature adjustment function at the time of temperature rise, and the larger the negative absolute value, the higher the temperature adjustment function at the time of temperature decrease.

As described above, the synthetic fibers and composite yarns obtained from Examples 1 to 3 had an excellent temperature control function both when the temperature was raised and when the temperature was lowered. The synthetic fiber obtained from Comparative Example 1 did not have a sufficient temperature control function at the time of temperature rise, and had a function only at the time of temperature decrease. On the other hand, the synthetic fiber obtained from Comparative Example 2 showed the opposite behavior to that of Comparative Example 1. In addition, the synthetic fiber obtained from Comparative Example 3 containing no temperature control material obtained a result having no temperature control function both when the temperature was raised and when the temperature was lowered.

The present invention relates to a composite yarn composed of a synthetic fiber having a temperature control function (temperature control fiber).

The temperature control fiber is a synthetic fiber provided with a function of alleviating a rapid temperature change when there is a temperature change of a temperature increase or a temperature decrease.
As such a temperature-controlling fiber, a material having a melting point near room temperature is encapsulated in a microcapsule, and a material in which the microcapsule is adhered to a base material, or a material in which the substance itself or the microcapsule is mixed in the fiber, have conventionally been used. It has been proposed (for example, Patent Documents 1 to 3).

JP-A-58-55699 JP-A-1-85374 Japanese Patent Publication No. 2004-510068

However, the above substances are substances having a melting point higher than the temperature in the garment (the temperature between the skin and the garment) of 31 to 32 ° C. (normally, present as a solid) or a substance having a lower melting point (normally, present as a liquid). Is combined with the fiber. In the former case, when the outside air changes above 31-32 ° C, the endothermic effect seen when the phase changes from solid to liquid appears, but when the outside air changes below 31-32 ° C, the phase changes from liquid to solid. There is no heating effect seen when changing. In the latter case, when the outside air changes to 31 to 32 ° C or higher, the endothermic effect seen when the phase changes from solid to liquid does not appear, but when the outside air changes to 31 to 32 ° C or lower, the liquid changes to solid. Exothermic effects appear during the phase change. As described above, at present, it has only one of the effects and the temperature control function is not sufficiently exhibited.
Therefore, an object of the present invention is to obtain a fiber having both a heat absorbing effect and a heat generating effect and having a good temperature control function.

The present inventors have disclosed a fiber containing a specific temperature control material having a melting point lower than the temperature in the garment of 31 to 32 ° C, and a fiber containing a specific temperature control material having a melting point higher than the temperature in the garment of 31 to 32 ° C. The present inventors have found that, by using a composite yarn obtained by tying the fibers with the fibers, a temperature control function can be exerted in all seasons both when the temperature is raised and when the temperature is lowered, and a comfortable garment material can be provided.
That is , the present invention provides a synthetic fiber comprising a thermoplastic resin containing Component 1 having a melting onset temperature of 34 ° C. or higher and a melting peak temperature of 50 ° C. or lower, a crystallization onset temperature of less than 30 ° C., and a crystallization peak. A composite yarn comprising a synthetic fiber made of a thermoplastic resin containing a component 2 having a temperature in the range of 5 ° C. or more, and a synthetic fiber .
In the composite yarn, Component 1 is a crystalline poly-α-olefin having a side chain carbon chain composed of at least one of C18, C20 and C22, and Component 2 is composed of a side chain carbon chain having C12, C14 and C16. It is preferably a crystalline poly-α-olefin comprising at least one or more.
In the above-mentioned composite yarn, the synthetic fiber composed of the thermoplastic resin containing the component 1 is a core-sheath type composite fiber containing the component 1 in the core, and the synthetic fiber composed of the thermoplastic resin containing the component 2 has the component 2 in the core. It is preferably a core-in-sheath type composite fiber, and the heat of fusion ΔHm observed at 50 ° C or lower is 1 to 5 J / g, and the heat of crystallization ΔHc observed at 50 ° C or lower is 1 to 5 J / g. Is preferred.

ADVANTAGE OF THE INVENTION According to this invention, the phase of the temperature control material can be sensitively changed with respect to the temperature change caused by the difference in the environment between summer and winter when moving from indoor to outdoor, from outdoor to indoor, and thus the skin-clothes. It is possible to provide a fiber having an excellent temperature control function capable of suppressing a rapid temperature change during the operation.

It is a figure which shows the temperature control function evaluation at the time of temperature rise (31 degreeC-50 degreeC) of the fiber obtained from the reference example of this invention, an Example, and a comparative example. It is a figure which shows the temperature control function evaluation at the time of the temperature fall (31 degreeC-3 degreeC) of the fiber obtained from the reference example of this invention, an Example, and a comparative example. It is a figure explaining the evaluation method of a temperature control function. It is a figure which shows the temperature control function evaluation of the fiber obtained from the reference example of this invention, an Example, and a comparative example.

Hereinafter, the present invention will be described in detail.
The present invention is a synthetic fiber made of a thermoplastic resin containing Component 1 and Component 2.
The melting point and the freezing point of the components 1 and 2 of the present invention are set before and after the temperature in clothes. Usually, the temperature in the garment is 31 to 32 ° C. At this temperature, when the temperature rises, an endothermic effect due to heat of fusion caused by a phase transition from the solid to the melt, and when the temperature falls, the temperature changes from the melt to the solid. It is configured to exhibit a heat-generating effect due to solidification heat caused by the phase transition, and to exhibit a good temperature control function both when the temperature is increased and when the temperature is decreased.
Hereinafter, the components 1 and 2 will be described in detail.

First, component 1 will be described. Component 1 has a melting onset temperature of 34 ° C. or higher and a melting peak temperature of 50 ° C. or lower. Especially, it is preferable that the melting start temperature is in the range of 34 ° C. or more and the melting peak temperature is in the range of 45 ° C. or less.
The temperature between the skin and the clothes is usually about 31 to 32 ° C. At this time, the component 1 exists as a solid, and when the outside air temperature rises, a phase transition from the solid to the melt occurs, and a rapid temperature rise inside the clothes can be suppressed by an endothermic effect.

Preferred examples of the component 1 include a polymer of acrylic acid or methacrylic acid, a derivative ester thereof and a wax, a side-chain crystalline polymer, and the like.
More specifically, for example, acrylic acid includes polyeicosyl acrylate, polynonadecyl acrylate, polyheptadecyl acrylate, polypalmityl acrylate, polypentadecyl acrylate, polystearyl acrylate, polylauryl acrylate, polymyristyl acrylate, etc. Or derivatives of these acrylic acids.
As methacrylic acid, polydocosyl methacrylate, polyphenicosyl methacrylate, polymyristyl methacrylate, polypentadecyl methacrylate, polypalmityl methacrylate, polyheptadecyl methacrylate, polynonadecyl methacrylate, polyeicosyl methacrylate, polyhestearyl methacrylate, Examples include poly (palmityl / stearyl) methacrylate and the like, or esters of these methacrylic acids.
Examples of the side-chain crystalline polymer include side-chain crystals such as α-olefin polymers (crystalline poly-α-olefins), alkyl acrylate polymers, alkyl methacrylate polymers, alkyl ethylene oxide polymers, polysiloxane polymers and acrylamide polymers. Polymer.
Among these, crystalline poly-α-olefin is particularly preferred. The crystalline poly-α-olefin may be a homopolymer or a copolymer with an olefin such as ethylene or propylene. Further, the carbon chain of the side chain is preferably any of C18, C20 and C22.

The heat of fusion ΔHm of the component 1 is preferably from 10 to 150 J / g, and more preferably from 60 to 150 J / g. Within this range, a good endothermic effect is likely to be obtained.

The half width of the melting peak of Component 1 obtained by differential scanning calorimetry is preferably 10 ° C. or less. More preferably, it is 5 ° C. or lower. Within this range, the melting peak of the component 1 in the DSC chart at the time of temperature rise is sharp, and the heat absorption effect at the pinpoint is excellent. In particular, the temperature control function at the time of temperature rise is excellent.

Next, the component 2 will be described. Component 2 has a crystallization onset temperature of less than 30 ° C and a crystallization peak temperature of 5 ° C or more.
The temperature between the skin and the clothes is usually about 31 to 32 ° C. At this time, the component 2 exists as a liquid, and when the outside air temperature drops, a phase transition from a melt to a solid occurs, and a rapid temperature drop inside the garment can be suppressed by the heat generation effect. By including these components 1 and 2, it is possible to have a temperature control function both when raising and lowering the temperature.

As the component 2, a substance similar to the component 1 described above is preferably used.
That is, a polymer of acrylic acid or methacrylic acid, a derivative ester thereof and a wax, a side chain crystalline polymer, or the like is preferably used.
More specifically, for example, acrylic acid includes polyeicosyl acrylate, polynonadecyl acrylate, polyheptadecyl acrylate, polypalmityl acrylate, polypentadecyl acrylate, polystearyl acrylate, polylauryl acrylate, polymyristyl acrylate, etc. Or derivatives of these acrylic acids.
As methacrylic acid, polydocosyl methacrylate, polyphenicosyl methacrylate, polymyristyl methacrylate, polypentadecyl methacrylate, polypalmityl methacrylate, polyheptadecyl methacrylate, polynonadecyl methacrylate, polyeicosyl methacrylate, polyhestearyl methacrylate, Examples include poly (palmityl / stearyl) methacrylate and the like, or esters of these methacrylic acids.
Examples of the side-chain crystalline polymer include side-chain crystals such as α-olefin polymers (crystalline poly-α-olefins), alkyl acrylate polymers, alkyl methacrylate polymers, alkyl ethylene oxide polymers, polysiloxane polymers and acrylamide polymers. Polymer.
Among these, crystalline poly-α-olefin is particularly preferred. The crystalline poly-α-olefin may be a homopolymer or a copolymer with an olefin such as ethylene or propylene. Further, the carbon chain of the side chain is preferably any of C12, C14 and C16.

Component 2 preferably has a heat of crystallization ΔHc of 10 to 150 J / g, more preferably 40 to 150 J / g. Within this range, a good heat-generating effect can be easily obtained.

The FWHM of the crystallization peak of Component 2 obtained by differential scanning calorimetry is preferably 10 ° C. or less. More preferably, it is 5 ° C. or lower. Within this range, the crystallization peak of the component 2 in the DSC chart at the time of temperature decrease is sharp, and the exothermic effect at the pinpoint is excellent. In particular, the temperature control function at the time of temperature decrease is excellent.

In the synthetic fiber of the present invention, various thermoplastic resins can be used.
Specifically, for example, polyamides such as polyamide 6 (hereinafter sometimes referred to as PA6), polyamide 66 and polyamide 12, polyesters such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate and polylactic acid, polyethylene and polypropylene And the like, or a polymer containing these as a main component.
A polyolefin-based thermoplastic resin is preferable in that it has excellent compatibility with the above components 1 and 2. Examples of such a polyolefin-based thermoplastic resin include polyethylene, polypropylene, polybutene, and polymethylpentene.

The synthetic fiber of the present invention is preferably a core-in-sheath type composite fiber in which a thermoplastic resin containing Component 1 and Component 2 is disposed in a core portion, and a thermoplastic resin capable of forming fibers is disposed in a sheath portion.
In this case, various thermoplastic resins as described above can be used as the thermoplastic resin for the core and the sheath.
In particular, a preferred combination of thermoplastic resins is to use a polyolefin-based thermoplastic resin for the core and a thermoplastic resin selected from polyester, polyamide, and polyolefin for the sheath.

In the present invention, when the above-mentioned core-sheath type conjugate fiber is used, it is preferable that the core is not exposed to the fiber surface from the viewpoint of temperature control function and handleability.
In this case, the composite fiber is made of an alloy resin composition obtained by melt-kneading the component 1, the component 2 and the thermoplastic resin as a core component and a thermoplastic resin selected from the above as a sheath component. Is preferred.

When the core-sheath type composite fiber is used, the core-sheath ratio (volume ratio) is preferably from 20:80 to 80:20, more preferably from 30:70 to 70: 30.
When the core-sheath type conjugate fiber is used, it may be a single core-sheath type or a multi-core multi-core type (sea-island type).

In addition, in the present invention, as a method for incorporating Component 1 and Component 2 into the thermoplastic resin, a method in which Component 1 and Component 2 are melt-kneaded with the thermoplastic resin, mixed, and then combined is preferable.
For example, the following methods can be considered for the composite method.
(1) Kneading three kinds of components 1 and 2 and a thermoplastic resin (formation of resin composition)
(2) A resin composition obtained by kneading the component 1 and the thermoplastic resin and a resin composition obtained by kneading the component 2 and the thermoplastic resin are blended when fiberizing. (3) Core part The two kinds of alloys obtained in (2) are arranged in a multi-island state in the component

Component 1: Component 2: The ratio (mass ratio) of the thermoplastic resin is preferably from 5: 5: 90 to 20:20:60 from the viewpoint of temperature control function and comfort as a clothing material. : 10:80 to 15:15:70.
In the case of the core-sheath type composite fiber, when the core contains Component 1: Component 2: Thermoplastic resin, the core preferably has the above ratio.

The synthetic fiber of the present invention may be a single fiber or a composite fiber made of a thermoplastic resin containing the components 1 and 2, or a core-sheath type composite fiber containing the above components 1 and 2 in the core. You may.

The synthetic fiber of the present invention preferably has a heat of fusion ΔHm of 1 to 5 J / g, which is observed at 50 ° C. or lower, from the viewpoint of the temperature control function, and a crystal of the synthetic fiber which is observed at 50 ° C. or lower. It is preferable that the heat of formation ΔHc be 1 to 5 J / g.

Further, the present invention is also a composite yarn in which synthetic fibers made of a thermoplastic resin containing the above component 1 and synthetic fibers made of a thermoplastic resin containing the above component 2 are combined. Each synthetic fiber used in the composite yarn of the present invention may be a single fiber or a composite fiber. In a particularly preferred embodiment, a core-sheath composite fiber containing the component 1 in the core portion and a core-sheath composite fiber containing the component 2 in the core portion are combined.
Preferable examples of the form of the composite yarn include (1) aligning the respective synthetic fibers, (2) blending the respective synthetic fibers by air entanglement and the like, and (3) twisting the respective synthetic fibers.

In the composite yarn of the present invention, the heat of fusion ΔHm of the composite yarn observed at 50 ° C or lower is preferably 1 to 5 J / g, and the crystal of the composite yarn observed at 50 ° C or lower, from the viewpoint of the temperature control function. It is preferable that the heat of formation ΔHc be 1 to 5 J / g.

Next, a method for producing the synthetic fiber of the present invention will be described.
Component 1 and Component 2 are compounded with a thermoplastic resin forming a core by a twin-screw kneader. A sheath thermoplastic resin is prepared. Each of the above two resins is melted using an extruder having a temperature equal to or higher than the melting point of the resin, preferably equal to or higher than 20 ° C. from the melting point. The molten resin is passed through a die for forming a core and a sheath, and the resin is extruded into a predetermined cross-sectional shape from a hole in the surface of the die to be fiberized. The extruded fiber is cooled by cold air, an oil agent is applied, and the fiber is wound. The wound fiber is stretched by applying heat, and heat-set to obtain the synthetic fiber of the present invention. The winding speed is not particularly limited, but is preferably from 700 m / min to 2000 m / min.

Hereinafter, the present invention will be described more specifically with reference to Reference Examples, Examples, and Specific Examples, but the present invention is not limited thereto.

<Kneading>
Base resin: 80% by mass of polypropylene, 20% by mass of temperature control agent: One or more crystalline poly-α-olefins (described below as component 1 for a melting point of 40 ° C. and component 2 for a melting point of 29 ° C.) As a composition of the above, 8.0 kg / hr of polypropylene was supplied by a twin-screw kneader, melt-kneaded at 250 ° C., the cord-like melt was cooled with water, and pelletized by a pelletizer to obtain a polypropylene-based resin composition.
<Spinning>
Composite spinning was performed at a temperature of 250 ° C. using a melt extrusion type composite spinning machine using the polypropylene resin composition and polyamide 6 as main spinning raw materials.
At the time of spinning, the polypropylene resin composition is separately melted so that the core component and the polyamide 6 become the sheath component, and then combined with a core-sheath type spinneret into a core-sheath form and spun. Then, it was cooled and wound up at a spinning speed of 800 m / min while applying an oil agent. Thereafter, the film was stretched 3.0 times on a hot roller at 50 ° C., heat-set at 140 ° C. with a stretching roller, and wound up to obtain a synthetic fiber of 84 dtex / 24f.
<Production of tubular knitted fabric>
A tubular knitted fabric was produced from the obtained synthetic fiber or composite yarn using a tubular knitting machine (CR-B, manufactured by Eiko Sangyo Co., Ltd., 3.5 inches in diameter, 260 needles).
<Calibration analysis: melting peak temperature, crystallization peak temperature, melting start temperature, crystallization start temperature>
The measurement was performed using a differential scanning calorimeter (Diamond DSC: manufactured by PerkinElmer Japan). The heating and cooling rates were unified at 10 ° C./min. The temperature condition is 0 ° C to 60 ° C, the temperature is maintained at 60 ° C for 5 minutes, the temperature is lowered to 60 ° C to 0 ° C, the temperature is maintained at 0 ° C for 5 minutes, and the first scan is performed. The sample was held for 5 minutes, the temperature was lowered to 60 ° C. to 0 ° C., and the sample held at 0 ° C. for 5 minutes was used as a second scan. The melting peak temperature, crystallization peak temperature, melting start temperature, crystallization start temperature, heat of fusion, and heat of crystallization were calculated in accordance with JIS K7121.
<Evaluation of temperature control function>
A 10 cm square tubular knitted fabric (test sample) was allowed to stand in a hot air dryer set at 80 ° C. for 1.0 hr to completely melt the components 1 and 2, and then allowed to stand at 5 ° C. for 24 hr to solidify. The heat histories for 1 and component 2 were unified. The thermocouple type thermometer was wrapped in a tubular knitted fabric, allowed to stand for 1.0 hour at 31 ° C., which is the temperature between the skin and the clothes, and, after the temperature was stabilized, was transferred to a dryer set at 50 ° C. A change in temperature inside the fabric at a low temperature when transferred to a heat insulating container set at 3 ° C. or lower was confirmed.
The temperature difference from the test product was determined using a tubular knitted fabric made of a single yarn of polyamide 6 as a control product. From the obtained graph, the value of the maximum temperature difference and the area from the temperature difference graph 20 minutes after moving to a high temperature and 12 minutes after moving to a low temperature (the temperature difference graph in FIG. Area), and this was used as an evaluation index.
The larger the absolute value of the maximum temperature difference, the better the temperature control function.
Also, the larger the temperature difference area, the better the temperature control function.
The temperature control function (high temperature, low temperature) was evaluated in the following manner.
：: When the absolute value of the maximum temperature difference is 0.5 ° C or more
Δ: Absolute value of maximum temperature difference exceeds 0.4 ° C. and less than 0.5 ° C. X: Absolute value of maximum temperature difference is 0.4 ° C. or less

[ Reference Example 1]
A crystalline poly-α-olefin having a melting point of 29 ° C. was prepared as Component 2, and a crystalline poly-α-olefin having a melting point of 40 ° C. was prepared as Component 1. The components were simultaneously added at a composition of 10% by mass with respect to polypropylene. And kneaded to obtain a polypropylene resin composition. Then, by the spinning method, the resin composition was disposed on a core portion to obtain a core-sheath type composite fiber having a core-sheath ratio (volume ratio) of 67:33, and a tubular knitted fabric was produced by the method. .
The physical properties of Component 1 and Component 2 are as follows.

[ Reference Example 2]
A core-sheath type composite fiber was obtained in the same manner as in Reference Example 1 except that the core-sheath ratio (volume ratio) was changed to 50:50, and a tubular knitted fabric was produced.

[Example 3]
As the component 2, a crystalline poly-α-olefin having a melting point of 29 ° C. was kneaded by the above-mentioned method at a composition of 20% by mass with respect to polypropylene to obtain a resin composition. A core-sheath composite fiber A was obtained in the same manner as in Reference Example 1 except that the obtained polypropylene-based resin composition was disposed on the core.
Next, as a component 1, a crystalline poly-α-olefin having a melting point of 40 ° C. was kneaded by the above-described method at a composition of 20% by mass with respect to polypropylene to obtain a resin composition. A core-sheath type composite fiber B was obtained in the same manner as in Reference Example 1, except that the obtained polypropylene-based resin composition was disposed on the core.
The obtained core-in-sheath type composite fiber A and core-in-sheath type composite fiber B were aligned and combined to obtain a composite yarn, and a tubular knitted fabric was produced by the above method.

[Comparative Example 1]
Only a crystalline poly-α-olefin having a melting point of 29 ° C. was kneaded by the above method at a composition of 20% by mass with respect to polypropylene to obtain a resin composition. A core-sheath type conjugate fiber was obtained in the same manner as in Reference Example 1 except that the obtained resin composition was disposed on the core, and a tubular knitted fabric was produced.

[Comparative Example 2]
Only a crystalline poly-α-olefin having a melting point of 40 ° C. was kneaded by the above method at a composition of 20% by mass relative to polypropylene to obtain a resin composition. A core-sheath type conjugate fiber was obtained in the same manner as in Reference Example 1 except that the obtained resin composition was disposed on the core, and a tubular knitted fabric was produced.

[Comparative Example 3]
A core-sheath type composite fiber was obtained in the same manner as in Reference Example 1 except that polypropylene was provided in the core portion, and a tubular knitted fabric was produced.

[Comparative Example 4]
Polyamide single fiber of 84 dtex / 24f was prepared, and a tubular knitted fabric was produced by the above method.

Tables 1 and 2 show the raw materials, physical properties, core-sheath ratio, phase transition temperature observed below 50 ° C., phase transition calorie, and temperature control function of the fibers and composite yarns obtained from Reference Examples, Examples and Comparative Examples. Shown in

FIG. 1 shows that, in the evaluation of the temperature control function, the test article and the control article were each allowed to stand at 31 ° C. for 1.0 hour, and then the temperature change inside the cloth with the passage of time when moved to 50 ° C. was collected. FIG. 4 is a diagram showing a difference between a temperature change of an article and a temperature change of a control article. The larger the absolute value of the maximum temperature difference, the better the temperature control function. Also, the larger the area due to the temperature difference, the better the temperature control function.

FIG. 2 shows, in the evaluation of the temperature control function, the change in the temperature inside the cloth over time when the test article and the control article were allowed to stand at 31 ° C. for 1.0 hour and then moved to 3 ° C. It is the figure which showed the difference of the temperature change of the test sample and the control sample which were sampled. The larger the absolute value of the maximum temperature difference, the better the temperature control function. Also, the larger the area due to the temperature difference, the better the temperature control function.

FIG. 4 shows the temperature difference area value in the temperature control function. The Y-axis indicates that the larger the positive absolute value, the higher the temperature adjustment function at the time of temperature rise, and the larger the negative absolute value, the higher the temperature adjustment function at the time of temperature decrease.

As described above, the synthetic fibers and the composite yarns obtained from Reference Examples 1 and 2 and Example 3 had excellent temperature control functions both when the temperature was raised and when the temperature was lowered. The synthetic fiber obtained from Comparative Example 1 did not have a sufficient temperature control function at the time of temperature rise, and had a function only at the time of temperature decrease. On the other hand, the synthetic fiber obtained from Comparative Example 2 showed the opposite behavior to that of Comparative Example 1. In addition, the synthetic fiber obtained from Comparative Example 3 containing no temperature control material obtained a result having no temperature control function both when the temperature was raised and when the temperature was lowered.

Claims (6)

A synthetic fiber comprising a thermoplastic resin containing Component 1 and Component 2, wherein Component 1 has a melting onset temperature of 34 ° C. or more and a melting peak temperature of 50 ° C. or less, and Component 2 has a crystallization onset temperature of A synthetic fiber having a crystallization peak temperature of less than 30 ° C and a crystallization peak temperature of 5 ° C or more. The heat of fusion ΔHm of component 1 is 10 to 150 J / g, the heat of crystallization ΔHc of component 2 is 10 to 150 J / g, and the heat of fusion ΔHm of synthetic fibers observed at 50 ° C or lower is 1 to 5 J / g, 50 The synthetic fiber according to claim 1, wherein the heat of crystallization ΔHc of the synthetic fiber observed at a temperature of not more than ° C is 1 to 5 J / g. The synthetic fiber according to claim 1 or 2, wherein a half width of a melting peak of component 1 and a crystallization peak of component 2 obtained by differential scanning calorimetry is 10 ° C or less. Component 1 is a crystalline poly-α-olefin having a side chain carbon chain composed of at least one of C18, C20 and C22, and Component 2 is composed of a side chain carbon chain composed of at least one of C12, C14 and C16. The synthetic fiber according to any one of claims 1 to 3, which is a crystalline poly-α-olefin. The synthetic fiber according to any one of claims 1 to 4, wherein the mass ratio of Component 1, Component 2, and the thermoplastic resin is from 5: 5: 90 to 20:20:60. A synthetic fiber made of a thermoplastic resin containing Component 1 having a melting start temperature of 34 ° C. or more and a melting peak temperature of 50 ° C. or less, and a crystallization start temperature of less than 30 ° C. and a crystallization peak temperature of 5 ° C. or more A composite yarn comprising a synthetic fiber made of a thermoplastic resin containing the component 2 in the range, which is combined with the synthetic fiber.

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