Temperature-sensing humidity-regulating fiber and preparation method thereof

Abstract

The invention discloses a temperature-sensing humidity-regulating fiber and a preparation method thereof. The temperature-sensing humidity-regulating fiber comprises a polymer. The polymer comprises a polyester main chain and at least one side chain, and the side chain is connected with the polyester main chain. A side chain is of a structure shown in a formula (1): # imgabs0 #, wherein R is an extensional alkyl group. The temperature-sensing humidity-regulating fiber can be quickly dried at a high temperature to achieve a cooling function, and can slow down the drying rate of moisture at a low temperature to achieve a function of reducing heat loss, and the manufacturing method of the temperature-sensing humidity-regulating fiber can have greatly improved process convenience.

Description

Technical Field

[0001] The present invention relates to a fiber and a preparation method thereof, and in particular to a temperature-sensitive and humidity-regulating fiber and a preparation method thereof. Background Art

[0002] In recent years, as people's requirements for quality of life have gradually improved, the comfort of clothing has become an important consideration when purchasing clothing. Functional clothing that adjusts to the temperature difference between autumn and winter, air-conditioned environments, and temperature conditions and body temperature changes during exercise and sweating has become an emerging product in today's textile market.

[0003] Textiles used in sportswear need to provide users with quick-drying, cool feeling and reduced heat loss characteristics when external environmental conditions change, in order to maintain the thermal comfort of the textiles. However, traditional moisture-wicking clothing is mainly made through passive fabric structure design and post-finishing processing technology (single-sided or double-sided coating). Therefore, under saturated humidity during exercise, there is a disadvantage of losing the temperature and humidity regulation function due to stuffiness. Summary of the invention

[0004] The present invention provides a temperature-sensitive and humidity-regulating fiber, which can be dried quickly at high temperature to achieve a cooling function, and can slow down the drying rate of moisture at low temperature to achieve a function of reducing heat loss. The present invention also provides a temperature-sensitive and humidity-regulating fiber, which can have greatly improved process convenience.

[0005] According to one or more embodiments of the present invention, a temperature-sensitive and humidity-regulating fiber includes a polymer. The polymer includes a polyester main chain and at least one side chain, and the side chain is connected to the polyester main chain. The side chain is a structure shown in formula (1):

[0006] Wherein R is an alkylene group.

[0007] In one or more embodiments of the present invention, in formula (1), R is ethyl, propyl, butyl, pentyl, hexyl or heptyl.

[0008] In one or more embodiments of the present invention, the polyester backbone has a carbon segment, and the side chains are connected to the carbon segment of the polyester backbone.

[0009] According to one or more embodiments of the present invention, the preparation method of the temperature-sensitive and humidity-regulating fiber includes: subjecting N,N-diethylacrylamide and hydroxy methacrylate to a first polymerization reaction to form a first compound; subjecting a dibasic acid and a diol to a second polymerization reaction to form a second compound; subjecting the first compound and the second compound to a transesterification reaction to form a polymer; and fiberizing the polymer to form the temperature-sensitive and humidity-regulating fiber.

[0010] In one or more embodiments of the present invention, the content of N,N-diethylacrylamide is 90 to 110 parts by mole, and the content of hydroxy methacrylate is 2 to 10 parts by mole.

[0011] In one or more embodiments of the present invention, the first polymerization reaction is carried out between N,N-diethylacrylamide and hydroxy methacrylate in a solvent, and the solvent is the same as the diol.

[0012] In one or more embodiments of the present invention, the solvent, the dibasic acid and the diol are jointly subjected to a second polymerization reaction.

[0013] In one or more embodiments of the present invention, the first compound and the second compound are subjected to a transesterification reaction in a solvent, and the solvent is the same as the diol.

[0014] In one or more embodiments of the present invention, the diol includes ethylene glycol, polyethylene glycol or a combination thereof, and the weight average molecular weight of the diol is 62 g / mol to 200 g / mol.

[0015] In one or more embodiments of the present invention, the first compound has a lower critical solution temperature of 25° C. to 32° C. when the light transmittance is 3% to 80%.

[0016] According to the above embodiment of the present invention, the temperature-sensitive and humidity-regulating fiber contains a polymer. Through the configuration of the side chains in the polymer, the temperature-sensitive and humidity-regulating fiber can be dried quickly at high temperatures to achieve a cooling function, and can slow down the drying rate of water at low temperatures to achieve a function of reducing heat loss, thereby maintaining body temperature. On the other hand, in the process of preparing the temperature-sensitive and humidity-regulating fiber, since the connection process of each step does not need to be purified and cleaned, the product of each step can fully participate in the reaction of the subsequent step, thereby greatly improving the process convenience and increasing the yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the following are the descriptions of the accompanying drawings:

[0018] Figure 1 A flow chart showing a method for manufacturing a temperature-sensitive and humidity-regulating fiber according to some embodiments of the present invention is shown;

[0019] Figure 2 A light transmittance-temperature relationship diagram of the temperature-humidity control unit precursor in Table 1 is shown;

[0020] Figure 3 The temperature-sensitive and humidity-regulating fibers of Examples 1-3 and conventional polyester (polyethyleneterephthalate, PET) fibers and their contact conditions with water droplets are presented;

[0021] Figure 4A is a thermogravimetric analysis diagram of the temperature-sensitive and humidity-regulating polymer A4; and

[0022] Figure 4B This is the thermogravimetric analysis diagram of the temperature-sensitive and humidity-regulating fiber of Example 3.

[0023] Wherein, the reference numerals are:

[0024] S10~S40: Steps DETAILED DESCRIPTION

[0025] The following will disclose a number of embodiments of the present invention. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these practical details are not necessary and therefore should not be used to limit the present invention.

[0026] In this article, the structure of a polymer or group is sometimes represented by a skeleton formula. This representation can omit carbon atoms, hydrogen atoms, and carbon-hydrogen bonds. Of course, if the structural formula clearly shows atoms or atomic groups, the ones shown will prevail.

[0027] The present invention provides a temperature-sensitive and humidity-regulating fiber and a preparation method thereof. Through the configuration of the temperature-sensitive and humidity-regulating unit in the temperature-sensitive and humidity-regulating fiber, the temperature-sensitive and humidity-regulating fiber can be dried quickly at high temperatures to achieve a cooling function, and can slow down the drying rate of water at low temperatures to achieve a function of reducing heat loss, thereby maintaining body temperature. On the other hand, the present invention forms a temperature-sensitive and humidity-regulating fiber by grafting a temperature-sensitive and humidity-regulating unit precursor onto polyester. Since the solvent used to form the temperature-sensitive and humidity-regulating unit precursor can be directly used as a monomer for synthesizing polyester, after the temperature-sensitive and humidity-regulating unit precursor is synthesized, it does not need to be purified and cleaned to proceed to the next step. In this way, the temperature-sensitive and humidity-regulating unit precursor can fully participate in the grafting step, thereby greatly improving the process convenience and increasing the yield.

[0028] It should be understood that for the sake of clarity and convenience of description, the present invention will first describe the preparation method of the temperature-sensitive and humidity-regulating fiber to specifically present the means for achieving the effects of the present invention. Figure 1, which depicts a flow chart of a method for preparing a temperature-sensitive and humidity-controlling fiber according to some embodiments of the present invention. The method for preparing a temperature-sensitive and humidity-controlling fiber comprises steps S10 to S40. In step S10, a temperature-sensitive and humidity-controlling unit precursor (first compound) is formed. In step S20, a polyester (second compound) is formed. In step S30, the temperature-sensitive and humidity-controlling unit precursor is reacted with the polyester to form a temperature-sensitive and humidity-controlling polymer (polymer). In step S40, the temperature-sensitive and humidity-controlling polymer is fiberized to form a temperature-sensitive and humidity-controlling fiber. In the following description, each of the above steps will be further described in sequence.

[0029] [Step S10: Forming a temperature-sensing and humidity-controlling unit precursor]

[0030] The present invention allows N, N-diethylacrylamide and hydroxy methacrylate to undergo a first polymerization reaction to form a temperature-sensitive and humidity-adjusting unit precursor. In detail, N, N-diethylacrylamide can exhibit different affinity and hydrophobicity for different temperatures, that is, when N, N-diethylacrylamide senses temperature changes (e.g., ambient temperature changes), its affinity and hydrophobicity will change accordingly, thereby having the function of temperature-sensitive and humidity-adjusting. On the other hand, reacting N, N-diethylacrylamide with hydroxy methacrylate can facilitate the grafting of N, N-diethylacrylamide with polyester (to be described later). In detail, hydroxy methacrylate can be grafted with polyester through the hydroxyl group thereof, so that N, N-diethylacrylamide connected to hydroxy methacrylate is grafted on polyester, thereby forming a fiber with temperature-sensitive and humidity-adjusting properties. In some embodiments, hydroxy methacrylate can be hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, hydroxypentyl methacrylate, hydroxyhexyl methacrylate or hydroxyheptyl methacrylate, thereby providing good reactivity. In a preferred embodiment, the hydroxy methacrylate may be hydroxyethyl methacrylate or hydroxypropyl methacrylate, thereby reducing interference with the synthesis of polymers during the subsequent transesterification reaction (described later). In more detail, since hydroxyethyl methacrylate or hydroxypropyl methacrylate has a shorter carbon chain, it is possible to avoid forming excessive steric hindrance to interfere with the transesterification reaction.

[0031] In some embodiments, the number of segments formed by hydroxy methacrylate and the number of segments formed by N, N-diethylacrylamide in a single temperature-sensitive and humidity-controlling precursor molecule are not 1:1, but the number of segments formed by hydroxy methacrylate is larger, while the number of segments formed by N, N-diethylacrylamide is smaller. In other words, in the first polymerization reaction, a single hydroxy methacrylate molecule can react with another hydroxy methacrylate molecule in addition to reacting with N, N-diethylacrylamide. In general, a single temperature-sensitive and humidity-controlling precursor molecule can be formed by hydroxy methacrylate and N, N-diethylacrylamide connected in a random arrangement, wherein the number of segments formed by hydroxy methacrylate is larger, while the number of segments formed by N, N-diethylacrylamide is smaller. Through this design, the temperature-sensitive and humidity-controlling unit precursor can have enough hydroxyl groups to connect with polyester, and a good temperature-sensitive and humidity-controlling effect can be achieved without using too much N, N-diethylacrylamide. In some embodiments, the above design can be achieved by adjusting the content of N,N-diethylacrylamide and hydroxy methacrylate. More specifically, the content of N,N-diethylacrylamide can be 90 to 110 parts by mole, and the content of hydroxy methacrylate can be 2 to 10 parts by mole.

[0032] In some embodiments, hydroxy methacrylate and N,N-diethylacrylamide can be subjected to a first polymerization reaction in a suitable solvent. Specifically, the solvent may be a diol including ethylene glycol, polyethylene glycol, or a combination thereof. It is worth noting that in some embodiments, since the solvent (ethylene glycol or polyethylene glycol) can be directly used as a monomer for synthesizing polyester in the subsequent second polymerization reaction, after the thermo-humidifying unit precursor is synthesized, it is not necessary to purify and clean it to filter out the solvent, and the reactant (starter) of the second polymerization reaction can be directly added to the reaction tank of the first polymerization reaction to carry out the second polymerization reaction. In this way, the thermo-humidifying unit precursor can fully participate in the subsequent transesterification reaction, thereby greatly improving the process convenience and increasing the yield. In some embodiments, the weight average molecular weight of the diol can be 62 g / mol to 200 g / mol as measured by gel permeation chromatography (GPC), so as to provide sufficient fluidity to serve as a solvent during the first polymerization reaction and provide good reactivity for polymerization during the subsequent second polymerization reaction, thereby playing a dual role well.

[0033] In some embodiments, hydroxy methacrylate and N,N-diethylacrylamide can be polymerized under a suitable and appropriate amount (e.g., 0.4 to 0.6 molar parts) of a free radical initiator. Specifically, a suitable free radical initiator may be benzoyl peroxide or ammonium persulfate. In some embodiments, a solvent, hydroxy methacrylate, and N,N-diethylacrylamide may be added to a reaction tank, and nitrogen is introduced into the reaction tank and the temperature is raised. When the temperature of the reaction tank reaches about 60°C, the initiator is dripped in, and then when the temperature of the reaction tank reaches about 80°C, a solvent (ethylene glycol or polyethylene glycol) is further added to cool and reduce the concentration, and when the temperature drops to about 60°C, the initiator is dripped in again, and the reaction is continued until the total reaction time is about 6 hours. After completing step S10, a mixture containing at least a temperature-sensitive and humidity-regulating precursor can be obtained. The following formula (A) specifically presents the partial segment structure of a single temperature-sensitive and humidity-regulating precursor molecule in some embodiments:

[0034] wherein R is ethyl, propyl, butyl, pentyl, hexyl or heptyl.

[0035] The temperature-sensitive and humidity-controlling unit precursor of the present invention has different light transmittances at different temperatures. Specifically, when the temperature-sensitive and humidity-controlling unit precursor is at a relatively low temperature, the temperature-sensitive and humidity-controlling unit precursor has a high light transmittance; and when the temperature-sensitive and humidity-controlling unit precursor is at a relatively high temperature, the temperature-sensitive and humidity-controlling unit precursor has a low light transmittance. The above characteristics can be specifically presented by the lower critical solution temperature (LCST). In detail, as the temperature rises, the precursors of the thermo-humidity-sensing unit aggregate with each other, causing the light transmittance to decrease. When the light transmittance drops to 3%, the aggregation degree of the precursors of the thermo-humidity-sensing unit hardly changes with the temperature rise, and the temperature at this time is the maximum value of the low critical solution temperature of the precursors of the thermo-humidity-sensing unit; Conversely, as the temperature drops, the precursors of the thermo-humidity-sensing unit disperse with each other, causing the light transmittance to increase. When the light transmittance rises to 80%, the dispersion degree of the precursors of the thermo-humidity-sensing unit hardly changes with the temperature drop, and the temperature at this time is the minimum value of the low critical solution temperature of the precursors of the thermo-humidity-sensing unit. The low critical solution temperature range of the precursors of the thermo-humidity-sensing unit can represent the temperature range in which the hydrophilicity and hydrophobicity of the precursors of the thermo-humidity-sensing unit change. In detail, when the temperature is lower than the low critical solution temperature range, the precursors of the thermo-humidity-sensing unit have strong hydrophilicity, and when the temperature is higher than the low critical solution temperature range, the precursors of the thermo-humidity-sensing unit have weak hydrophilicity (strong hydrophobicity). Based on the above, since the temperature-sensing and humidity-controlling unit precursor of the present invention has different degrees of hydrophilicity and hydrophobicity at different temperatures, the temperature-sensing and humidity-controlling fiber prepared from the temperature-sensing and humidity-controlling unit precursor can be quickly dried at high temperature to achieve a cooling function, and can slow down the drying rate of moisture at low temperature to achieve the function of reducing heat loss.

[0036] It should be understood that in the present invention, the method for measuring the lower critical solution temperature includes the following steps. First, a 10 ml volume of an aqueous solution of a temperature-sensitive and humidity-controlling unit precursor (concentration of 1 wt%) is placed in a sample bottle at room temperature. Next, the sample bottle is placed in a UV / visible spectrometer (model JASCO V630). Subsequently, the initial temperature of the UV / visible spectrometer is set to 25°C, and the measurement is started. Next, the temperature is gradually increased to 36.5°C at a heating rate of 1°C / min, and the light transmittance of the temperature-sensitive and humidity-controlling unit precursor at each temperature is recorded. After the above steps, the lower critical solution temperature of the temperature-sensitive and humidity-controlling unit precursor can be obtained.

[0037] In some embodiments, the temperature-sensitive and humidity-controlling unit precursor may have a lower critical solution temperature of 25°C to 32°C when the light transmittance is 3% to 80%, wherein the wavelength of the light is 450 nm to 550 nm. Figure 2, wherein Table 1 records the preparation details (solvents and raw materials) of the temperature-sensing and humidity-controlling unit precursors according to different embodiments of the present invention and their corresponding lower critical solution temperatures, and Figure 2 The light transmittance-temperature relationship diagram of the temperature-humidity-control unit precursors in Table 1 is shown. Each temperature-humidity-control unit precursor in Table 1 is prepared by the aforementioned method in the present invention, wherein the free radical initiator is benzoyl peroxide, and the content (ratio) of benzoyl peroxide is 0.5 mol parts.

[0038] Table 1

[0039]

[0040] Note 1: “H” stands for ethyl methacrylate.

[0041] Note 2: “D” stands for N,N-diethylacrylamide.

[0042] Depend on Figure 2 As can be seen from Table 1, the present invention can prepare a variety of temperature-sensitive and humidity-controlling unit precursors with different lower critical solution temperature ranges. Since these temperature-sensitive and humidity-controlling unit precursors each have a different lower critical solution temperature range, and overall (looking at temperature-sensitive and humidity-controlling unit precursors A1-A6 at the same time), the distribution range of these lower critical solution temperatures is wide (25°C to 32°C), so the present invention can prepare temperature-sensitive and humidity-controlling unit precursors with suitable lower critical solution temperatures according to the needs of the user or the use environment, thereby preparing temperature-sensitive and humidity-controlling fibers with multiple applications, that is, the temperature-sensitive and humidity-controlling fibers of the present invention can have a wide range of applications. For example, when it is desired to prepare a thermosensitive and hygroscopic fiber that can undergo a change in hydrophilicity and hydrophobicity at a relatively low temperature (temperature of 25°C to 26°C), the thermosensitive and hygroscopic unit precursor A1 in Table 1 can be selected for preparation; when it is desired to prepare a thermosensitive and hygroscopic fiber that can undergo a change in hydrophilicity and hydrophobicity at a relatively high temperature (temperature of 30.5°C to 32°C), the thermosensitive and hygroscopic unit precursor A6 in Table 1 can be selected for preparation.

[0043] It is worth noting that, based on the rising / falling trend of the lower critical solution temperature in Table 1, the applicant unexpectedly discovered that when the proportion of hydroxy methacrylate increases, the lower critical solution temperature of the temperature-sensitive and humidity-controlling unit precursor tends to decrease. This is because hydroxy methacrylate contains hydroxyl groups. Therefore, when the proportion of ethyl methacrylate increases, the content of hydroxyl groups in the temperature-sensitive and humidity-controlling unit precursor will increase accordingly, thereby increasing the solubility of the temperature-sensitive and humidity-controlling unit precursor in water, resulting in a decrease in the lower critical solution temperature of the temperature-sensitive and humidity-controlling unit precursor in the aqueous phase.

[0044] [Step S20: Forming Polyester]

[0045] The present invention allows a dibasic acid and a diol to undergo a second polymerization reaction to form a polyester. In some embodiments, the dibasic acid may be terephthalic acid, and the diol may be ethylene glycol, polyethylene glycol, or a combination thereof. In other words, the polyester may be polyethylene terephthalate. In some embodiments, the weight average molecular weight of the diol may be 62 g / mol to 200 g / mol as measured by a gel permeation chromatography (GPC, product model: Hitachi L-6200), so that the diol and the dibasic acid do not have a weight average molecular weight that is too different, which can provide good reactivity to form a polyester with a higher purity.

[0046] In some embodiments, the dibasic acid and the diol can be placed in the mixture containing the temperature-sensitive and humidity-adjusting precursor obtained in step S10 to perform a second polymerization reaction. In this embodiment, the solvent (ethylene glycol or polyethylene glycol) in the mixture can all participate in the second polymerization reaction, that is, the dibasic acid, the diol and the solvent in the mixture can jointly perform the second polymerization reaction. In other words, the solvent in the first polymerization reaction can be used as a reactant in the second polymerization reaction. In this way, after the first polymerization reaction, no additional purification and cleaning is required to filter out the solvent, thereby greatly improving the process convenience and increasing the yield. In some embodiments, the dibasic acid and the diol can react in an oxygen-free environment (for example, a nitrogen environment) at a temperature of 260°C to 280°C and a pressure of 1atm to 3atm for 1 hour to 3 hours. In some embodiments, the molar ratio of the dibasic acid to the additionally added diol (that is, the diol of the non-solvent) can be 98:2 to 95:5, and preferably 95:5, so as to achieve a better reaction effect. In other embodiments, no additional diol is required. In addition, when the content of N,N-diethylacrylamide is 90 to 110 parts by mole, and the content of hydroxy methacrylate is 2 to 10 parts by mole, the content of the dibasic acid is 90 to 98 parts by mole. After completing step S20, polyester can be obtained. The structure of a single polyester molecule in some embodiments is specifically presented by formula (B) below:

[0047]

[0048] [Step S30: Forming a polymer (temperature-sensitive and humidity-controlling polymer)]

[0049] The present invention allows the thermo-sensitive and humidity-controlling unit precursor to undergo a transesterification reaction with polyester to form a polymer (thermo-sensitive and humidity-controlling polymer) having a thermo-sensitive and humidity-controlling function. In detail, the polyester forms a polyester main chain of the polymer after the transesterification reaction, and the thermo-sensitive and humidity-controlling unit precursor forms a side chain of the polymer after the transesterification reaction, wherein the polyester main chain has a carbon segment, and the side chain is connected to the carbon segment of the polyester main chain. In some embodiments, the thermo-sensitive and humidity-controlling unit precursor and the polyester can undergo a transesterification reaction in a solvent, and the solvent can be a diol such as ethylene glycol or polyethylene glycol. In detail, when in step S20, the dibasic acid and the diol are directly placed in the mixture containing the thermo-sensitive and humidity-controlling precursor obtained in step S10 to perform a second polymerization reaction, a catalytic amount of antimony acetate (Sb(CH3COO)3) can be directly added after the second polymerization reaction is completed to cause the thermo-sensitive and humidity-controlling unit precursor and the polyester to undergo a transesterification reaction. In some embodiments, the transesterification reaction may be carried out at a temperature of 270° C. to 290° C. and a pressure of 1 atm to 2 atm for 2 to 3 hours.

[0050] It is worth noting that, since the first polymerization reaction and the second polymerization reaction performed before the transesterification reaction of the present invention do not need to undergo the steps of removing the solvent and purifying, the first polymerization reaction, the second polymerization reaction and the transesterification reaction can be directly carried out in the same reaction tank. In this way, the temperature-sensing and humidity-controlling unit precursor and the polyester can fully participate in the transesterification reaction, thereby greatly improving the process convenience and increasing the yield. After completing step S30, a polymer with temperature-sensing and humidity-controlling functions can be obtained. The structure of a single polymer molecule in some embodiments is specifically presented by formula (C) below:

[0051]

[0052] [Step S40: Forming temperature-sensitive and humidity-regulating fibers]

[0053] The present invention makes the polymer fiberized to form a temperature-sensitive and humidity-controlled fiber. In some embodiments, the temperature-sensitive and humidity-controlled polymer can be uniformly mixed with a conventional polyester (polyethylene terephthalate) material, and a powder refining step, a powder dispersion step, and a mixing and granulation step are performed to form a fiber masterbatch. In some embodiments, the content of the temperature-sensitive and humidity-controlled polymer in the fiber masterbatch can be 0.5wt% to 5wt%. In some embodiments, the powder refining step can be a powder pulverization at room temperature using a pulverizer, and the powder dispersion step can be a powder dispersion for 4 minutes to 6 minutes at a speed of 450rpm to 550rpm. In some embodiments, the particle size of the polymer after the powder refining step can be 1 micron to 500 microns, so as to facilitate the mixing and granulation step. In some embodiments, the mixing temperature of the mixing and granulation step can be 220°C to 270°C, and the screw speed can be 150rpm to 250rpm. After completing step S40, the temperature-sensitive and humidity-controlled fiber of the present invention can be obtained. The temperature-sensitive and humidity-regulating fiber includes a polymer, wherein the polymer includes a polyester main chain and at least one side chain, and the side chain is connected to the carbon chain segment on the polyester main chain, and the side chain is a structure shown in formula (1):

[0054] Wherein R may be an alkylene group such as ethylene, propylene, butylene, pentylene, hexylene or heptylene. In some embodiments, the fiber specification of the temperature-sensitive and humidity-controlling fiber may be 75d / 72f to 75d / 36f. In some embodiments, after obtaining the temperature-sensitive and humidity-controlling fiber, it may be further woven into a fabric. Since the temperature-sensitive and humidity-controlling fiber can be dried quickly at high temperatures to achieve a cooling function, and can slow down the drying rate of moisture at low temperatures to achieve a function of reducing heat loss, the fabric made with the temperature-sensitive and humidity-controlling fiber of the present invention can provide stable thermal comfort to the user.

[0055] In the following description, a plurality of comparative examples and a plurality of embodiments are listed for testing and evaluation to verify the efficacy of the present invention. It should be understood that the present invention should not be construed in a restrictive manner by the embodiments below.

[0056] [Experimental Example 1: Water contact angle test of temperature-sensitive and humidity-regulating fibers]

[0057] In this experimental example, the temperature-sensitive and humidity-controlling unit precursor is grafted (transesterification reaction) with polyethylene terephthalate to form a temperature-sensitive and humidity-controlling polymer, and the temperature-sensitive and humidity-controlling polymer is fiberized to form a temperature-sensitive and humidity-controlling fiber, and then the water contact angle test of the temperature-sensitive and humidity-controlling fabric is performed. In detail, the preparation method of the temperature-sensitive and humidity-controlling polymer is as follows: 10 mole parts of ethyl methacrylate and 100 mole parts of N,N-diethylacrylamide are polymerized in ethylene glycol (weight average molecular weight: 62 g / mol) by the method described above in the specification of the present invention, so as to form a mixture containing a temperature-sensitive and humidity-controlling unit precursor in a reaction tank; then, 100 mole parts of ethylene glycol and 100 mole parts of terephthalic acid are placed in the reaction tank, and the polymerization reaction of ethylene glycol and terephthalic acid is carried out at a temperature of 280° C. and a pressure of 1 atm for 1 hour; after the polymerization reaction is completed, a catalytic amount of antimony acetate is added to the reaction tank, and a transesterification reaction is carried out at a temperature of 290° C. and a pressure of 1 atm for 2 hours. After the transesterification reaction is completed, the obtained temperature-sensitive and humidity-controlling polymer is fiberized to form a temperature-sensitive and humidity-controlling fiber, wherein the temperature-sensitive and humidity-controlling fiber is prepared in sequence through the powder refining step, powder dispersion step, mixing and granulation step and spinning step of step S40 mentioned in the specification of the present invention, wherein the powder dispersion step is carried out at a rotation speed of 450 rpm for 6 minutes, the mixing temperature of the mixing and granulation step is 220°C, the screw speed is 150 rpm, the fiber specification of the temperature-sensitive and humidity-controlling fiber is 75d / 72f, and in the temperature-sensitive and humidity-controlling fibers of Examples 1, 2, and 3, the content of the temperature-sensitive and humidity-controlling polymer in the fiber masterbatch is 0.5wt%, 3wt%, and 5wt%, respectively.

[0058] Test results can be found in Figure 3 , which presents the contact conditions between conventional polyester (PET) fibers and the temperature-sensitive and humidity-regulating fibers of Examples 1-3 and water droplets. It can be seen from the test results that at relatively low temperatures (25°C), relative to the contact angle between conventional polyester and water droplets, the contact angle between the surface of the temperature-sensitive and humidity-regulating fibers of Examples 1-3 and water droplets is smaller, and at relatively high temperatures (35°C), relative to the contact angle between conventional polyester and water droplets, the contact angle between the surface of the temperature-sensitive and humidity-regulating fibers of Examples 1-3 and water droplets is larger. It can be seen that the temperature-sensitive and humidity-regulating fibers of the present invention are more hydrophobic at high temperatures and can be dried quickly to achieve a cooling function, and are more hydrophilic at low temperatures and can slow down the drying rate of water to achieve the function of reducing heat loss, thereby maintaining body temperature. On the other hand, when the proportion of the temperature-sensitive and humidity-regulating polymer in the fiber increases, this phenomenon becomes more significant.

[0059] [Experimental Example 2: Thermogravimetric analysis test of temperature-sensitive and humidity-regulating polymers]

[0060] In this experimental example, the thermogravimetric analysis (TGA) of the aforementioned thermosensitive and humidity-controlling polymer A4 and the thermosensitive and humidity-controlling fiber of Example 3 was performed. The results are as follows: Figure 4A and 4B As shown, Figure 4A is the thermogravimetric analysis diagram of the temperature-sensitive and humidity-regulating polymer A4, and Figure 4B The thermogravimetric analysis diagram of the temperature-sensitive and humidity-controlling fiber of Example 3 (test conditions: temperature range of 20°C to 600°C, and heating rate of 10°C / min). The results show that the temperature-sensitive and humidity-controlling polymer A4 and the temperature-sensitive and humidity-controlling fiber of Example 3 have thermal decomposition temperatures of about 325°C and about 395°C, respectively (defined as the temperature at which the sample loses 5% of its weight). In other words, the temperature-sensitive and humidity-controlling polymer of the present invention can stably exist in the above-mentioned mixing temperature environment without deterioration, and the temperature-sensitive and humidity-controlling fiber also has high thermal stability.

[0061] According to the above embodiment of the present invention, the temperature-sensitive and humidity-regulating fiber contains a polymer. Through the configuration of the side chains in the polymer, the temperature-sensitive and humidity-regulating fiber can be dried quickly at high temperatures to achieve a cooling function, and can slow down the drying rate of water at low temperatures to achieve a function of reducing heat loss, thereby maintaining body temperature. On the other hand, in the process of preparing the temperature-sensitive and humidity-regulating fiber, since the connection process of each step does not need to be purified and cleaned, the product of each step can fully participate in the reaction of the subsequent step, thereby greatly improving the process convenience and increasing the yield.

[0062] Although the present invention has been disclosed as above in the form of an implementation method, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined by the attached claims.

Claims

1. A temperature-sensitive and humidity-regulating fiber, characterized in that: include: A polymer comprising: A polyester backbone; as well as At least one side chain is connected to the polyester main chain, wherein the side chain is a structure shown in formula (1): Wherein R is an alkylene group.

2. The temperature-sensitive and humidity-regulating fiber according to claim 1, characterized in that: In the formula (1), R is an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group or a heptyl group.

3. The temperature-sensitive and humidity-regulating fiber according to claim 1, characterized in that: The polyester main chain has a carbon chain segment, and the side chain is connected to the carbon chain segment of the polyester main chain.

4. A method for preparing a temperature-sensitive and humidity-regulating fiber, characterized in that: include: Conducting a first polymerization reaction between N,N-diethylacrylamide and hydroxy methacrylate to form a first compound; Conducting a second polymerization reaction between the dibasic acid and the diol to form a second compound; Allowing the first compound and the second compound to undergo a transesterification reaction to form a polymer; as well as The polymer is fiberized to form the temperature-sensitive and humidity-regulating fiber.

5. The method for preparing the temperature-sensitive and humidity-regulating fiber according to claim 4, characterized in that: The content of the N,N-diethylacrylamide is 90 to 110 parts by mole, and the content of the hydroxy methacrylate is 2 to 10 parts by mole.

6. The method for preparing the temperature-sensitive and humidity-regulating fiber according to claim 4, characterized in that: The N,N-diethylacrylamide and the hydroxy methacrylate undergo the first polymerization reaction in a solvent, and the solvent is the same as the diol.

7. The method for preparing the temperature-sensitive and humidity-regulating fiber according to claim 6, characterized in that: The solvent, the dibasic acid and the diol are jointly subjected to the second polymerization reaction.

8. The method for preparing the temperature-sensitive and humidity-regulating fiber according to claim 4, characterized in that: The first compound and the second compound undergo the transesterification reaction in a solvent, and the solvent is the same as the diol.

9. The method for preparing the temperature-sensitive and humidity-regulating fiber according to claim 4, characterized in that: The diol includes ethylene glycol, polyethylene glycol or a combination thereof, and the weight average molecular weight of the diol is 62 g / mol to 200 g / mol.

10. The method for preparing the temperature-sensitive and humidity-regulating fiber according to claim 4, characterized in that: The first compound has a lower critical solution temperature of 25° C. to 32° C. when the light transmittance is 3% to 80%.

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