CN111823672A - Towel with cooling and refreshing functions and preparation method thereof - Google Patents

Abstract

The invention discloses a towel with cool and refreshing functions, which is prepared from the following raw materials in parts by weight: 25-35 parts of cool fiber, 15-25 parts of modified viscose fiber, 50-60 parts of 10% sodium carbonate solution and 10-15 parts of fine sulfur cotton, adding the cool fiber into the 10% sodium carbonate solution, heating to 90-100 ℃, cooking for 1h at the temperature, taking out and washing with deionized water for three times; in the preparation process of the cool fiber, terephthalic acid and ethylene glycol are added into a reaction kettle, the terephthalic acid and the ethylene glycol are subjected to esterification reaction to generate a compound A, then polyethylene glycol ether and dimethyl isophthalate-5-sodium sulfonate are added into a polycondensation kettle, esterification reaction is carried out between the polyethylene glycol ether and the dimethyl isophthalate-5-sodium sulfonate, the compound A is added and subjected to polycondensation reaction with the compound A to generate a polymer B, and the polymer B is of a microporous cellular structure.

Description

Towel with cooling and refreshing functions and preparation method thereof

Technical Field

The invention belongs to the technical field of towel preparation, and particularly relates to a towel with cool and refreshing functions and a preparation method thereof.

Background

When the environment changes, the fastest adaptive response of the human body is the change of a circulatory system, the heat generated in the human body is carried to the skin, and the heat dissipation is increased through sweating and evaporation. If sweat cannot be effectively transferred and evaporated, a large amount of heat is accumulated in the body, the comfort of the human body is affected, fatigue and shivering reaction can be caused due to high body temperature, and the motion ability of the human body is even reduced. The human body always loses moisture through gaseous sweat, which is very important for keeping the heat balance and comfort of the human body, and the process depends on the state of the human body and the surrounding climate environment;

when the towel is used for wiping, the towel not only covers a passive body on the skin, but also can interact with the skin heat regulation function which is changed due to different movement states and has a regulation function on the skin heat regulation function, and the heat and moisture transmission attribute of the towel is a key factor for determining that the heat accumulated by a human body and the generated sweat can be actively transmitted to the outside of the towel in movement, so that the heat and moisture can be dissipated, the comfort is improved, and the towel is prevented from being in a clothes-human body microenvironment and reducing the heat and moisture comfort of the human body.

The Chinese invention patent CN107245787A discloses a cool sweat-absorbing summer clothing fabric, which is prepared by interweaving warps and wefts through an upper and lower plain weave, wherein the warps are honeycomb micropore modified terylene/jade fiber/viscose blended yarns, the wefts are modified bamboo fiber/hemp fiber/soybean protein fiber blended yarns, and the cool sweat-absorbing summer clothing fabric is prepared by heat setting, crease-resisting softening and finishing. The fabric has excellent sweat absorption performance and air permeability, can effectively control the adhesive feeling caused by sports sweating, and has good cool feeling, antibacterial property and ultraviolet resistance; the crease-resist agent has the advantages of good crease-resist effect, easy coloring, smooth and soft hand feeling, washing resistance, good wearing comfort and healthier wearing.

Disclosure of Invention

In order to overcome the technical problems, the invention provides a towel with cool and refreshing functions and a preparation method thereof.

The technical problems to be solved by the invention are as follows:

(1) the unmodified viscose fiber does not have a large number of hygroscopic hydrophilic groups, and although the viscose fiber contains a large number of hydroxyl groups, the proportion of non-crystalline parts of the viscose fiber is small, so that the hygroscopic property of the viscose fiber is not excellent enough and the viscose fiber does not have excellent mechanical property;

(2) the existing towel only can wipe sweat stains, and the towel cannot have a cool and refreshing feeling when the body surface is wiped at a high temperature.

The purpose of the invention can be realized by the following technical scheme:

a towel with cool and refreshing functions is prepared from the following raw materials in parts by weight: 25-35 parts of cool fiber, 15-25 parts of modified viscose fiber, 50-60 parts of sodium carbonate solution with the mass fraction of 10% and 10-15 parts of fine sulfur cotton;

the towel with the cool and refreshing function is prepared by the following method:

firstly, adding cool fiber into 10% sodium carbonate solution, heating to 90-100 ℃, cooking for 1h at the temperature, taking out, and washing with deionized water for three times;

secondly, mixing and spinning the washed cool fibers and combed cotton to obtain cool base cloth, spinning the modified viscose fibers into elastic yarns according to the twist of 20 twists/10 cm, and spinning the elastic yarns at intervals into grid base cloth with the warp-wise spacing of 0.6cm and the weft-wise spacing of 0.6cm to obtain elastic gauze;

and thirdly, weaving the cool base cloth and the elastic gauze in a composite mode to obtain the towel with the cool and refreshing function.

Further, the cool fiber is prepared by the following method:

step S1, adding terephthalic acid and ethylene glycol into a reaction kettle, heating to 150 ℃ and 180 ℃, stirring at the rotating speed of 120r/min for 45-60min, and reacting for 2h to obtain a compound A; adding polyethylene glycol ether and dimethyl isophthalate-5-sodium sulfonate into a polycondensation kettle, magnetically stirring for 10min, adding triphenyl phosphate, then adding a compound A, heating to 180-class 200 ℃ to obtain a polymer B, and controlling the weight ratio of terephthalic acid, ethylene glycol, polyethylene glycol ether, dimethyl isophthalate-5-sodium sulfonate to triphenyl phosphate to be 1: 2: 0.5-0.8: 1: 0.5;

step S2, uniformly mixing the molecular sieve and the polymer B, drying and crystallizing, heating to 50 ℃ in the drying process, then heating to 80 ℃ from 50 ℃, controlling the heating time to be 2h, keeping the temperature at 80 ℃ for 5h, then heating to 120 ℃, controlling the heating time to be 2h, keeping the temperature at the temperature for 2h, adding nano silicon dioxide, extruding through a screw extruder, carrying out melt spinning, and preparing the cool fiber, wherein the weight ratio of the molecular sieve to the polymer B to the nano silicon dioxide is controlled to be 3: 1: 0.5.

Step S1, adding terephthalic acid and ethylene glycol into a reaction kettle, carrying out esterification reaction on the terephthalic acid and the ethylene glycol to generate a compound A, then adding polyethylene glycol ether and dimethyl isophthalate-5-sodium sulfonate into a polycondensation kettle, carrying out esterification reaction between the polyethylene glycol ether and the dimethyl isophthalate-5-sodium sulfonate, adding the compound A and carrying out polycondensation reaction with the compound A at the temperature of 180 ℃ and 200 ℃ to generate a polymer B, wherein the polymer B is of a honeycomb-shaped microporous structure, then in step S2, drying and crystallizing the molecular sieve and the polymer B, wherein the molecular sieve has larger pore diameter and larger gap, then adding nano-silica for melt spinning, and compressing air in the aggregation and melting processes of the molecular sieve to further promote the prepared fiber to have the honeycomb-shaped microporous structure, when the fiber contacts human skin, the fiber can rapidly migrate the moisture on the surface of the skin to the surface of the fiber for diffusion and volatilization by the honeycomb microporous structure of the fiber according to the capillary principle, so that the skin feels cool and cool.

Further, the modified viscose fiber is prepared by the following method:

(1) adding a first reinforcing agent into a viscose stock solution, magnetically stirring for 30min to prepare a mixed solution C, defoaming, filtering, feeding the mixed solution C into a coagulating bath through a spinneret plate, adding a second reinforcing agent, forming to prepare nascent fibers, stretching the nascent fibers to prepare strong viscose, and controlling the weight ratio of the viscose stock solution to the first reinforcing agent to the second reinforcing agent to be 12-15: 3: 1;

(2) soaking the strong viscose fiber in a sodium hydroxide solution with the mass fraction of 10%, heating to 45-50 ℃, soaking for 20-30min at the temperature, stirring at the rotating speed of 180r/min for 10min, heating to 60 ℃, stirring at the rotating speed of 120r/min, adding sodium chloroacetate, reacting for 4h, washing with deionized water for three times, transferring to a dilute hydrochloric acid solution with the mass fraction of 10%, soaking for 30min, taking out, and washing with deionized water for three times to obtain the modified viscose fiber.

In the step (1), a first reinforcing agent and a second reinforcing agent are added into viscose stock solution, then the viscose stock solution is stretched to prepare a strong viscose, in the step (2), the viscose is soaked into 10 percent sodium hydroxide solution for alkalization, sodium hydroxide damages hydrogen bonds in the viscose in the alkalization process, and then damages a fiber crystallization area, so that the area of the crystallization area is reduced, the area of an amorphous area is increased, the accessibility of the amorphous area is improved, the orderliness of the crystallization area can be reduced by alkalization, the active surface area of the crystallization area is enhanced, then the temperature is raised to 60 ℃, the viscose is further swelled, sodium chloroacetate is added, the penetration of sodium chloroacetate into the swelled viscose is promoted, the carboxyl content of the viscose is increased, hydrophilic groups are added to the treated viscose, water molecules can be adsorbed, the area of the fiber crystallization area is reduced, the area of the viscose amorphous area is increased, the surface area of the crystal grains is increased, the non-bonded hydrophilic groups on the surface of the crystal grains are increased, and the modified viscose fiber has excellent hygroscopicity and good mechanical property.

Further, the first reinforcing agent is one or two of a polyamide epichlorohydrin water solution with the mass fraction of 10% and a polyethyleneimine water solution with the mass fraction of 12%, and the second reinforcing agent is a urea-formaldehyde resin water solution with the mass fraction of 13%.

Further, in the step (2), the weight ratio of the strong viscose fiber to the sodium chloroacetate is controlled to be 20: 1.

A preparation method of a towel with cooling and refreshing functions comprises the following steps:

firstly, adding cool fiber into 10% sodium carbonate solution, heating to 90-100 ℃, cooking for 1h at the temperature, taking out, and washing with deionized water for three times;

secondly, mixing and spinning the washed cool fibers and combed cotton to obtain cool base cloth, spinning the modified viscose fibers into elastic yarns according to the twist of 20 twists/10 cm, and spinning the elastic yarns at intervals into grid base cloth with the warp-wise spacing of 0.6cm and the weft-wise spacing of 0.6cm to obtain elastic gauze;

and thirdly, weaving the cool base cloth and the elastic gauze in a composite mode to obtain the towel with the cool and refreshing function.

The invention has the beneficial effects that:

(1) the invention relates to a towel with cool and cool functions, which is woven by cool fibers and modified viscose fibers, wherein in the preparation process of the cool fibers, in step S1, terephthalic acid and ethylene glycol are added into a reaction kettle, the terephthalic acid and the ethylene glycol are subjected to esterification reaction to generate a compound A, then polyethylene glycol ether and dimethyl isophthalate-5-sodium sulfonate are added into a polycondensation kettle, esterification reaction is performed between the polyethylene glycol ether and the dimethyl isophthalate-5-sodium sulfonate, the compound A is added and subjected to polycondensation reaction with the compound A at the temperature of 180 ℃ and 200 ℃ to generate a polymer B, the polymer B is a honeycomb-shaped microporous structure, in step S2, a molecular sieve and the polymer B are dried and crystallized, the molecular sieve has larger pore size and larger gaps, then nano silicon dioxide is added for melt spinning, the molecular sieve further promotes the prepared fiber to have a honeycomb micropore structure by compressing air in the gathering and melting process, when the fiber is contacted with the skin of a human body, the honeycomb micropore structure of the fiber can rapidly migrate the water on the surface of the skin to the surface of the fiber for diffusion and volatilization by virtue of the capillary principle, so that the skin feels cool and cool, and the technical problem that the existing towel can only play a role in wiping sweat stains and cannot have a cool and cool feeling when the body surface temperature is higher is solved;

(2) the modified viscose fiber is prepared by adding a first reinforcing agent and a second reinforcing agent into viscose stock solution in the step (1) in the preparation process and then stretching the mixture to prepare the strong viscose fiber, the viscose fiber is firstly soaked into 10 percent sodium hydroxide solution for alkalization in the step (2), sodium hydroxide damages hydrogen bonds in the viscose fiber in the alkalization process, further damages a fiber crystallization area, reduces the area of the crystallization area, increases the area of an amorphous area, improves the accessibility of the amorphous area, reduces the orderliness of the crystallization area by alkalization, enhances the active surface area of the amorphous area, then heats up to 60 ℃, further swells the viscose fiber, adds sodium chloroacetate, promotes the sodium chloroacetate to permeate into the swollen viscose fiber and increases the carboxyl content of the sodium chloroacetate, so that the treated viscose fiber is added with hydrophilic groups, can absorb water molecules and reduces the area of the viscose fiber crystallization area, the area of the amorphous region is increased, so that the surface area of the crystal grains is increased, the unbonded hydrophilic groups on the surfaces of the crystal grains are increased, the modified viscose fiber has excellent hygroscopicity and good mechanical property, and the technical problems that the unmodified viscose fiber does not have a large number of hygroscopic hydrophilic groups, and the viscose fiber contains a large number of hydroxyl groups but has small proportion of amorphous parts, so that the hygroscopicity is not excellent and the mechanical property is not excellent are solved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A towel with cool and refreshing functions is prepared from the following raw materials in parts by weight: 25 parts of cool fiber, 15 parts of modified viscose fiber, 50 parts of 10% sodium carbonate solution and 10 parts of fine sulfur cotton;

the towel with the cool and refreshing function is prepared by the following method:

firstly, adding cool fiber into a 10% sodium carbonate solution, heating to 100 ℃, cooking for 1h at the temperature, taking out, and washing with deionized water for three times;

secondly, mixing and spinning the washed cool fibers and combed cotton to obtain cool base cloth, spinning the modified viscose fibers into elastic yarns according to the twist of 20 twists/10 cm, and spinning the elastic yarns at intervals into grid base cloth with the warp-wise spacing of 0.6cm and the weft-wise spacing of 0.6cm to obtain elastic gauze;

and thirdly, weaving the cool base cloth and the elastic gauze in a composite mode to obtain the towel with the cool and refreshing function.

The cool fiber is prepared by the following method:

step S1, adding terephthalic acid and ethylene glycol into a reaction kettle, heating to 180 ℃, stirring at the rotating speed of 120r/min for 60min, and reacting for 2h to obtain a compound A; adding polyethylene glycol ether and dimethyl isophthalate-5-sodium sulfonate into a polycondensation kettle, magnetically stirring for 10min, adding triphenyl phosphate, then adding a compound A, heating to 200 ℃ to obtain a polymer B, and controlling the weight ratio of terephthalic acid, ethylene glycol, polyethylene glycol ether, dimethyl isophthalate-5-sodium sulfonate to triphenyl phosphate to be 1: 2: 0.5: 1: 0.5;

step S2, uniformly mixing the molecular sieve and the polymer B, drying and crystallizing, heating to 50 ℃ in the drying process, then heating to 80 ℃ from 50 ℃, controlling the heating time to be 2h, keeping the temperature at 80 ℃ for 5h, then heating to 120 ℃, controlling the heating time to be 2h, keeping the temperature at the temperature for 2h, adding nano silicon dioxide, extruding through a screw extruder, carrying out melt spinning, and preparing the cool fiber, wherein the weight ratio of the molecular sieve to the polymer B to the nano silicon dioxide is controlled to be 3: 1: 0.5.

The modified viscose fiber is prepared by the following method:

(1) adding 10% of polyamide epichlorohydrin aqueous solution into viscose stock solution, magnetically stirring for 30min to prepare mixed solution C, then defoaming, filtering, feeding the mixed solution C into a coagulating bath through a spinneret plate, adding 13% of urea-formaldehyde resin aqueous solution by mass fraction, forming to prepare nascent fiber, then stretching the nascent fiber to prepare strong viscose fiber, and controlling the weight ratio of the viscose stock solution, the first reinforcing agent and the second reinforcing agent to be 12: 3: 1;

(2) soaking the strong viscose fiber in 10% sodium hydroxide solution, heating to 45 ℃, soaking for 20min at the temperature, stirring at a rotating speed of 180r/min for 10min, heating to 60 ℃, stirring at a rotating speed of 120r/min, adding sodium chloroacetate, reacting for 4h, washing with deionized water for three times, transferring to 10% dilute hydrochloric acid solution, soaking for 30min, taking out, and washing with deionized water for three times to obtain the modified viscose fiber, wherein the weight ratio of the strong viscose fiber to the sodium chloroacetate is controlled to be 20: 1.

Example 2

A towel with cool and refreshing functions is prepared from the following raw materials in parts by weight: 28 parts of cool fiber, 18 parts of modified viscose fiber, 54 parts of 10% sodium carbonate solution and 12 parts of refined sulfur cotton;

the towel with the cool and refreshing function is prepared by the following method:

firstly, adding cool fiber into a 10% sodium carbonate solution, heating to 100 ℃, cooking for 1h at the temperature, taking out, and washing with deionized water for three times;

secondly, mixing and spinning the washed cool fibers and combed cotton to obtain cool base cloth, spinning the modified viscose fibers into elastic yarns according to the twist of 20 twists/10 cm, and spinning the elastic yarns at intervals into grid base cloth with the warp-wise spacing of 0.6cm and the weft-wise spacing of 0.6cm to obtain elastic gauze;

and thirdly, weaving the cool base cloth and the elastic gauze in a composite mode to obtain the towel with the cool and refreshing function.

The rest is the same as example 1.

Example 3

A towel with cool and refreshing functions is prepared from the following raw materials in parts by weight: 32 parts of cool fiber, 22 parts of modified viscose fiber, 58 parts of 10% sodium carbonate solution and 14 parts of refined sulfur cotton;

the towel with the cool and refreshing function is prepared by the following method:

firstly, adding cool fiber into a 10% sodium carbonate solution, heating to 100 ℃, cooking for 1h at the temperature, taking out, and washing with deionized water for three times;

secondly, mixing and spinning the washed cool fibers and combed cotton to obtain cool base cloth, spinning the modified viscose fibers into elastic yarns according to the twist of 20 twists/10 cm, and spinning the elastic yarns at intervals into grid base cloth with the warp-wise spacing of 0.6cm and the weft-wise spacing of 0.6cm to obtain elastic gauze;

and thirdly, weaving the cool base cloth and the elastic gauze in a composite mode to obtain the towel with the cool and refreshing function.

The rest is the same as example 1.

Example 4

A towel with cool and refreshing functions is prepared from the following raw materials in parts by weight: 35 parts of cool fiber, 25 parts of modified viscose fiber, 60 parts of 10% sodium carbonate solution and 15 parts of fine sulfur cotton;

the towel with the cool and refreshing function is prepared by the following method:

firstly, adding cool fiber into a 10% sodium carbonate solution, heating to 100 ℃, cooking for 1h at the temperature, taking out, and washing with deionized water for three times;

secondly, mixing and spinning the washed cool fibers and combed cotton to obtain cool base cloth, spinning the modified viscose fibers into elastic yarns according to the twist of 20 twists/10 cm, and spinning the elastic yarns at intervals into grid base cloth with the warp-wise spacing of 0.6cm and the weft-wise spacing of 0.6cm to obtain elastic gauze;

and thirdly, weaving the cool base cloth and the elastic gauze in a composite mode to obtain the towel with the cool and refreshing function.

The rest is the same as example 1.

Comparative example 1

In comparison with example 1, the present comparative example uses silk instead of cool fiber, and the preparation method is as follows:

a towel with cool and refreshing functions is prepared from the following raw materials in parts by weight: 25 parts of silk, 15 parts of modified viscose, 50 parts of 10% sodium carbonate solution and 10 parts of refined sulfur cotton;

the towel with the cool and refreshing function is prepared by the following method:

firstly, silk is added into a 10% sodium carbonate solution, heated to 100 ℃, cooked for 1h at the temperature, and then taken out and washed with deionized water for three times;

secondly, mixing and spinning the washed silk and combed cotton to obtain cool base cloth, spinning the modified viscose into elastic yarns according to the twist of 20 twists/10 cm, and spinning the elastic yarns at intervals into grid base cloth with the warp-wise spacing of 0.6cm and the weft-wise spacing of 0.6cm to obtain elastic gauze;

and thirdly, weaving the cool base cloth and the elastic gauze in a composite mode to obtain the towel with the cool and refreshing function.

Comparative example 2

Compared with example 1, the viscose fiber of the comparative example is not modified, and the preparation method is as follows:

firstly, adding cool fiber into a 10% sodium carbonate solution, heating to 100 ℃, cooking for 1h at the temperature, taking out, and washing with deionized water for three times;

secondly, mixing and spinning the washed cool fibers and combed cotton to obtain cool base cloth, spinning viscose fibers into elastic yarns according to the twist of 20 twists/10 cm, and spinning the elastic yarns at intervals into grid base cloth with the warp-wise spacing of 0.6cm and the weft-wise spacing of 0.6cm to obtain elastic gauze;

and thirdly, weaving the cool base cloth and the elastic gauze in a composite mode to obtain the towel with the cool and refreshing function.

Comparative example 3

The comparative example is a cool towel in the market.

The cooling feeling and the sweat absorption rate of examples 1 to 4 and comparative examples 1 to 3 were measured, and the results are shown in table 1 below;

TABLE 1

The mechanical properties of the viscose fibers of examples 1 to 4 and comparative example 2 were measured, and the results are shown in table 2 below;

TABLE 2

As can be seen from tables 1-2 above, the cooling sensitivities of examples 1-4 are from 0.135 to 0.138Q-max (W/m)²) The sweat absorption rate was 320.5-321.6%, and the cooling sensitivity of comparative examples 1-3 was 0.095-0.128Q-max (W/m)²) The sweat absorption rate is 135.0-256.2%; the dry strength of the viscose fibres of examples 1-4 is 5.1-5.3(cN/dtex), the wet strength is 3.2-3.6(cN/dtex), the dry strength of comparative example 2 is 3.5(cN/dtex), and the wet strength is 1.8 (cN/dtex); therefore, the molecular sieve and the polymer B are dried and crystallized, the molecular sieve has larger aperture and larger gap, then the nano silicon dioxide is added for melt spinning, the molecular sieve compresses air through aggregation and melting processes, and further the prepared fiber has a cellular microporous structure, when the fiber is in contact with the skin of a human body, the water on the surface of the skin can be rapidly migrated to the surface of the fiber for diffusion and volatilization through the cellular microporous structure of the fiber by the capillary principle, so that the skin feels cool and cool, and the technical problem that the existing towel can only play a role in wiping sweat stains and cannot have cool and cool feeling when the body surface temperature is higher for wiping is solved.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims (6)

1. A towel with cool and refreshing functions is characterized by being prepared from the following raw materials in parts by weight: 25-35 parts of cool fiber, 15-25 parts of modified viscose fiber, 50-60 parts of 10% sodium carbonate solution and 10-15 parts of fine sulfur cotton;

the towel with the cool and refreshing function is prepared by the following method:

firstly, adding cool fiber into 10% sodium carbonate solution, heating to 90-100 ℃, cooking for 1h at the temperature, taking out, and washing with deionized water for three times;

secondly, mixing and spinning the washed cool fibers and combed cotton to obtain cool base cloth, spinning the modified viscose fibers into elastic yarns according to the twist of 20 twists/10 cm, and spinning the elastic yarns at intervals into grid base cloth with the warp-wise spacing of 0.6cm and the weft-wise spacing of 0.6cm to obtain elastic gauze;

and thirdly, weaving the cool base cloth and the elastic gauze in a composite mode to obtain the towel with the cool and refreshing function.

2. The towel with the cool and refreshing function according to claim 1, wherein the cool feeling fiber is prepared by the following method:

step S1, adding terephthalic acid and ethylene glycol into a reaction kettle, heating to 150 ℃ and 180 ℃, stirring at the rotating speed of 120r/min for 45-60min, and reacting for 2h to obtain a compound A; adding polyethylene glycol ether and dimethyl isophthalate-5-sodium sulfonate into a polycondensation kettle, magnetically stirring for 10min, adding triphenyl phosphate, then adding a compound A, heating to 180-class 200 ℃ to obtain a polymer B, and controlling the weight ratio of terephthalic acid, ethylene glycol, polyethylene glycol ether, dimethyl isophthalate-5-sodium sulfonate to triphenyl phosphate to be 1: 2: 0.5-0.8: 1: 0.5;

step S2, uniformly mixing the molecular sieve and the polymer B, drying and crystallizing, heating to 50 ℃ in the drying process, then heating to 80 ℃ from 50 ℃, controlling the heating time to be 2h, keeping the temperature at 80 ℃ for 5h, then heating to 120 ℃, controlling the heating time to be 2h, keeping the temperature at the temperature for 2h, adding nano silicon dioxide, extruding through a screw extruder, carrying out melt spinning, and preparing the cool fiber, wherein the weight ratio of the molecular sieve to the polymer B to the nano silicon dioxide is controlled to be 3: 1: 0.5.

3. The towel with the cool and refreshing function according to claim 1, wherein the modified viscose fiber is prepared by the following method:

(1) adding a first reinforcing agent into a viscose stock solution, magnetically stirring for 30min to prepare a mixed solution C, defoaming, filtering, feeding the mixed solution C into a coagulating bath through a spinneret plate, adding a second reinforcing agent, forming to prepare nascent fibers, stretching the nascent fibers to prepare strong viscose, and controlling the weight ratio of the viscose stock solution to the first reinforcing agent to the second reinforcing agent to be 12-15: 3: 1;

(2) soaking the strong viscose fiber in 10% sodium hydroxide solution, heating to 45-50 ℃, soaking for 20-30min at the temperature, stirring at a rotating speed of 180r/min for 10min, heating to 60 ℃, stirring at a rotating speed of 120r/min, adding sodium chloroacetate, reacting for 4h, washing with deionized water for three times, transferring to 10% dilute hydrochloric acid solution, soaking for 30min, taking out, and washing with deionized water for three times to obtain the modified viscose fiber.

4. The towel with the cooling function according to claim 3, wherein the first reinforcing agent is one or two of a polyamide-epichlorohydrin aqueous solution with the mass fraction of 10% and a polyethyleneimine aqueous solution with the mass fraction of 12%, and the second reinforcing agent is a urea-formaldehyde resin aqueous solution with the mass fraction of 13%.

5. A towel with cooling and refreshing functions according to claim 3, wherein the weight ratio of the strong viscose fiber and the sodium chloroacetate in the step (2) is controlled to be 20: 1.

6. The method for preparing a towel with cooling and refreshing functions according to claim 1, which is characterized by comprising the following steps:

firstly, adding cool fiber into 10% sodium carbonate solution, heating to 90-100 ℃, cooking for 1h at the temperature, taking out, and washing with deionized water for three times;

secondly, mixing and spinning the washed cool fibers and combed cotton to obtain cool base cloth, spinning the modified viscose fibers into elastic yarns according to the twist of 20 twists/10 cm, and spinning the elastic yarns at intervals into grid base cloth with the warp-wise spacing of 0.6cm and the weft-wise spacing of 0.6cm to obtain elastic gauze;

and thirdly, weaving the cool base cloth and the elastic gauze in a composite mode to obtain the towel with the cool and refreshing function.