Skin-friendly cool polyester fabric and preparation method thereof

Abstract

The invention relates to the technical field of fabrics, and discloses a skin-friendly cool polyester fabric and a preparation method thereof. The invention relates to preparation of a microcapsule phase change material finishing polyester fabric, which comprises the following steps: taking an aliphatic hydrocarbon compound as a phase change core material, taking polyurethane as a capsule wall, and taking 2-aliphatic amino-4, 6-diserinol s-triazine synthesized by serinol, cyanuric chloride and aliphatic amine as a chain extender. The chain extender contains four hydroxyl groups and can be chemically crosslinked with isophorone diisocyanate and polyethylene glycol to form a three-dimensional crosslinked network and a porous structure, so that more phase change materials can be coated; the compatibility of long-chain alkyl and octadecane and other core materials is good, the affinity of the capsule wall and the core materials can be enhanced, the coating amount can be increased, the phase change core materials can generate phase change along with the temperature change of the external environment to absorb a large amount of latent heat, the phase change temperature adjusting function is improved, and the fabric has the temperature adjusting and cooling characteristics. Meanwhile, the chain extender contains a plurality of hydrophilic imino groups, so that the hydrophilicity and moisture absorption capacity of the fabric can be improved, the moisture regain is increased, and the skin-friendly cool feeling effect is enhanced.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, specifically to a skin-friendly and cool-feeling polyester fabric and its preparation method. Background Technology

[0002] With the improvement of living standards and the change of consumption concepts, people's demand for comfortable and functional textiles has increased significantly, and cool and comfortable clothes have become necessities in the hot summer.

[0003] Polyester fiber, as the most produced variety of chemical fiber, is favored for its advantages such as easy washing, strong dimensional stability, good wrinkle resistance, blendability, and resistance to mildew and insects. It is widely used in clothing fabrics, decorative fabrics, and industrial textiles. However, polyester fabrics have poor moisture absorption, are prone to static electricity, are not skin-friendly, and do not absorb sweat, resulting in a stuffy feeling when worn. Therefore, developing cool, comfortable, and skin-friendly polyester fabrics adapted to high-heat environments has become a new leading direction in the development of summer clothing fabrics, especially in apparel products where the application of cooling functions is most significant. Cooling polyester fabrics not only provide people with a cool and comfortable wearing experience but also respond to the themes of low carbon and environmental protection, which is of great significance for improving the quality of polyester products and expanding their market application value.

[0004] Phase change materials (PCMs) are substances capable of undergoing any of the four phase transitions: solid-solid, solid-liquid, liquid-gas, or solid-gas. During these transitions, they absorb and release a large amount of latent heat, and are widely used in energy storage and temperature control. Based on the characteristic of PCMs absorbing, storing, and releasing a large amount of latent heat in response to changes in the external environment's temperature, their application in textiles provides both warmth and coolness, and maintains a relatively constant temperature within the small space between the human body and the textile.

[0005] Polyurethane possesses properties such as softness, elasticity, and excellent moisture and air permeability, making it an excellent microcapsule shell material and fabric finishing agent. Microcapsules with a polyurethane shell not only protect the core material from environmental factors, but more importantly, they offer advantages such as good mechanical properties, excellent wear resistance, and diverse and controllable structures. Furthermore, the polyurethane shell exhibits good resistance to degradation by water, oil, and solvents. Summary of the Invention

[0006] (a) Technical problems to be solved:

[0007] To address the shortcomings of existing technologies, this invention provides a skin-friendly and cooling polyester fabric and its preparation method, solving the problems of traditional polyester fabrics being neither skin-friendly nor sufficiently cooling.

[0008] (II) Technical Solution: The preparation method of the skin-friendly and cooling polyester fabric is as follows:

[0009] Step S1: Under a nitrogen atmosphere, isophorone diisocyanate and dry polyethylene glycol are added to a flask and heated to 70-80℃. The reaction is carried out for 2-2.5 hours. Then, phase change core material, 2-aliphatic amino-4,6-diserine triazine, and dibutyltin dilaurate are added. The reaction is carried out at 60-70℃ for 4-6 hours. The mixture is filtered, washed with ethanol, and dried to obtain microcapsule phase change material.

[0010] Step S2: Add the microcapsule phase change material to water to prepare a finishing solution. Dip and rub the polyester fabric twice in the finishing solution, pre-dry and bake to obtain a skin-friendly and cool polyester fabric.

[0011] Furthermore, in step S1, the phase change core material is an aliphatic hydrocarbon compound with the molecular formula Ci. a H 2a+2 , where a is 18-22.

[0012] Furthermore, in step S1, the amount of isophorone diisocyanate is 28-32 parts by weight, the amount of polyethylene glycol (2000) is 100 parts by weight, the amount of phase change core material is 180-240 parts by weight, the amount of dibutyltin dilaurate is 0.07-0.1 parts by weight, and the amount of 2-aliphatic amino-4,6-diserine triazine is 42-53 parts by weight.

[0013] Furthermore, in step S2, the mass concentration of the finishing solution is 150-400 g / L.

[0014] Furthermore, the preparation method of 2-aliphatic amino-4,6-diserine triazine is as follows:

[0015] Step (1): In an ice-water bath, add toluene and 100 parts by weight of cyanuric chloride to a flask, and dropwise add a toluene solution containing 85-146 parts by weight of aliphatic amine. Stir the reaction at 0-5℃ for 3-5 hours, adding sodium hydroxide dropwise during the reaction to maintain the pH of the solution at 7-8. After the reaction, extract and wash successively with hydrochloric acid solution, sodium bicarbonate solution, and sodium chloride solution. Dry the toluene organic layer with anhydrous sodium sulfate, filter, concentrate the filtrate under reduced pressure, and recrystallize the product from n-heptane to obtain 2-aliphatic amino-4,6-dichlorotriazine. The reaction formula is:

[0016]

[0017] Step (2): Add 170-230 parts by weight of 2-aliphatic amino-4,6-dichlorotriazine and acetone to a flask, heat to 30-40°C, slowly add an aqueous solution containing 100 parts by weight of serine alcohol, heat to 80-90°C, stir the reaction for 3-6 hours, add sodium hydroxide aqueous solution dropwise during the reaction to maintain the pH of the reaction solution at 7-8, distill under reduced pressure, and recrystallize the product in chloroform to obtain 2-aliphatic amino-4,6-diserine alcohol triazine. The reaction formula is:

[0018]

[0019] Furthermore, the molecular formula of aliphatic amines is NH2-C. n H 2n+1 n is any integer from 10 to 18.

[0020] (III) Beneficial Technical Effects:

[0021] Phase change materials are materials that can absorb and release a large amount of latent heat during the phase change process. They absorb, store and release a large amount of latent heat as the temperature of the external environment changes. When applied to textiles, they have the function of regulating temperature and cooling, and can maintain the basic constant temperature in the small space between the human body and the textiles.

[0022] 2-Aliphatic amino-4,6-diserine triazine, synthesized from serinel, cyanuric chloride, and aliphatic amines, possesses four hydroxyl groups. It undergoes a chemical cross-linking reaction with isophorone diisocyanate and polyethylene glycol, resulting in a polyurethane capsule wall that forms a three-dimensional cross-linked network and a porous structure. This facilitates the encapsulation of more phase change materials. Simultaneously, aliphatic amines, as long-chain alkyl groups, exhibit better compatibility with phase change core materials such as octadecane. Introducing these into the polyurethane capsule wall enhances the affinity between the capsule wall and the phase change material, further improving the capsule wall's affinity for the phase change core material. The high coating content of the phase change core material allows it to undergo a phase change and absorb a large amount of latent heat as the external temperature changes, giving the phase change capsule better phase change performance and temperature regulation function. After finishing the polyester fabric, it will give the polyester fabric a temperature-regulating and cooling characteristic. At the same time, 2-aliphatic amino-4,6-diserine triazine has multiple hydrophilic imino groups. When introduced into the polyurethane capsule wall, it improves the hydrophilicity of the polyester fabric, enhances its moisture absorption capacity, and increases its moisture regain, which is beneficial to improving the skin-friendly and cooling effect of the fabric. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the embodiments. Unless otherwise specified, all reagents or instruments used are commercially available conventional products.

[0024] Example 1:

[0025] Step (1): In an ice-water bath, add 50 mL of toluene and 5 g of cyanuric chloride to a flask, and dropwise add 40 mL of a toluene solution containing 4.25 g (27.07 mmol) of n-decylamine. Stir the reaction at 5 °C for 3 h, adding sodium hydroxide dropwise during the reaction to maintain the pH of the solution at 7. After the reaction, extract and wash successively with 0.4% hydrochloric acid solution, 0.8% sodium bicarbonate solution, and saturated sodium chloride solution. Dry the toluene organic layer with anhydrous sodium sulfate, filter, concentrate the filtrate under reduced pressure, and recrystallize the product from n-heptane to obtain 2-n-decylamino-4,6-dichlorotriazine. The structural formula is:

[0026] Step (2): Add 34 g of 2-n-decylamino-4,6-dichlorotriazine (111.84 mmol) and 50 mL of acetone to a flask, heat to 40 °C, slowly add 120 mL of an aqueous solution containing 20 g of serine alcohol, heat to 90 °C, stir the reaction for 3 h, add sodium hydroxide aqueous solution dropwise during the reaction to maintain the pH of the reaction solution at 7, distill under reduced pressure, and recrystallize the product in chloroform to obtain 2-n-decylamino-4,6-diserine alcohol triazine. The structural formula is:

[0027] Step (3): Under a nitrogen atmosphere, 14g of isophorone diisocyanate and 50g of dry polyethylene glycol were added to a flask and heated to 80°C. The mixture was reacted for 2.5h. Then, 90g of octadecane, 26.5g of 2-n-decylamino-4,6-diserine triazine (64mmol), and 0.035g of dibutyltin dilaurate were added. The mixture was reacted at 70°C for 6h. After filtration, washing with ethanol, and drying, the microcapsule phase change material was obtained.

[0028] Step (4): Add the microcapsule phase change material to water to prepare a finishing solution with a concentration of 150 g / L. Dip and rub the polyester fabric in the finishing solution twice (80% of the feed rate), pre-dry at 80°C for 3 min and at 160°C for 4 min to obtain a skin-friendly and cool polyester fabric.

[0029] Example 2:

[0030] Step (1): In an ice-water bath, add 40 mL of toluene and 5 g of cyanuric chloride to a flask, and add 30 mL of toluene solution containing 7.3 g of hexadecylamine dropwise. Stir the reaction at 0 °C for 5 h. During the reaction, add sodium hydroxide dropwise to maintain the pH of the solution at 8. After the reaction, extract and wash the product successively with 0.4% hydrochloric acid solution, 0.8% sodium bicarbonate solution and saturated sodium chloride solution. Dry the toluene organic layer with anhydrous sodium sulfate, filter, concentrate the filtrate under reduced pressure, and recrystallize the product with n-heptane to obtain 2-hexadecylamino-4,6-dichlorotriazine.

[0031] Step (2): Add 46g of 2-hexadecylamino-4,6-dichlorotriazine and 40mL of acetone to the flask, heat to 30℃, slowly add 100mL of aqueous solution containing 20g of serine alcohol, heat to 80℃, stir the reaction for 6h, add sodium hydroxide aqueous solution dropwise during the reaction to maintain the pH of the reaction solution at 8, distill under reduced pressure, recrystallize the product in chloroform to obtain 2-hexadecylamino-4,6-diserine triazine.

[0032] Step (3): Under a nitrogen atmosphere, 14g of isophorone diisocyanate and 50g of dry polyethylene glycol were added to a flask and heated to 80°C. The mixture was reacted for 2 hours. Then, 110g of nonadecane, 21g of 2-hexadecylamino-4,6-diserine triazine, and 0.035g of dibutyltin dilaurate were added. The mixture was reacted at 60°C for 4 hours. The mixture was filtered, washed with ethanol, and dried to obtain the microcapsule phase change material.

[0033] Step (4): Add the microcapsule phase change material to water to prepare a finishing solution with a concentration of 250 g / L. Dip and rub the polyester fabric in the finishing solution twice (with a 90% pick-up rate), pre-dry at 90°C for 5 min, and pre-dry at 150°C for 4 min to obtain a skin-friendly and cool polyester fabric.

[0034] Example 3:

[0035] Step (1): In an ice-water bath, add 45 mL of toluene and 5 g of cyanuric chloride to a flask, and add 35 mL of toluene solution containing 4.5 g of octadecylamine dropwise. Stir the reaction at 3 °C for 4 h. During the reaction, add sodium hydroxide dropwise to maintain the pH of the solution at 7. After the reaction, extract and wash the product successively with 0.4% hydrochloric acid solution, 0.8% sodium bicarbonate solution and saturated sodium chloride solution. Dry the toluene organic layer with anhydrous sodium sulfate, filter, concentrate the filtrate under reduced pressure, and recrystallize the product with n-heptane to obtain 2-octadecylamine-4,6-dichlorotriazine.

[0036] Step (2): Add 40g of 2-octadecylamino-4,6-dichlorotriazine and 40mL of acetone to the flask, heat to 35℃, slowly add 110mL of an aqueous solution containing 20g of serine alcohol, heat to 85℃, stir the reaction for 5h, add sodium hydroxide aqueous solution dropwise during the reaction to maintain the pH of the reaction solution at 8, distill under reduced pressure, recrystallize the product in chloroform to obtain 2-octadecylamino-4,6-diserine alcohol triazine.

[0037] Step (3): Under a nitrogen atmosphere, 15g of isophorone diisocyanate and 50g of dry polyethylene glycol were added to a flask and heated to 80°C. The mixture was reacted for 2 hours. Then, 100g of eicosane, 23g of 2-octadecylamino-4,6-diserine triazine, and 0.045g of dibutyltin dilaurate were added. The mixture was reacted at 60°C for 5 hours. After filtration, washing with ethanol, and drying, the microcapsule phase change material was obtained.

[0038] Step (4): Add the microcapsule phase change material to water to prepare a finishing solution with a concentration of 300 g / L. Dip and rub the polyester fabric in the finishing solution twice (with a 90% pick-up rate), pre-dry at 80°C for 3 min and at 150°C for 4 min to obtain a skin-friendly and cool polyester fabric.

[0039] Example 4:

[0040] Step (1): In an ice-water bath, add 50 mL of toluene and 5 g of cyanuric chloride to a flask, and add 30 mL of toluene solution containing 6.5 g of tetradecylamine dropwise. Stir the reaction at 4 °C for 4.5 h. During the reaction, add sodium hydroxide dropwise to maintain the pH of the solution at 8. After the reaction, extract and wash the product successively with 0.4% hydrochloric acid solution, 0.8% sodium bicarbonate solution and saturated sodium chloride solution. Dry the toluene organic layer with anhydrous sodium sulfate, filter, concentrate the filtrate under reduced pressure, and recrystallize the product with n-heptane to obtain 2-tetradecylamino-4,6-dichlorotriazine.

[0041] Step (2): Add 42g of 2-tetradecanoic-4,6-dichlorotriazine and 45mL of acetone to the flask, heat to 40℃, slowly add 115mL of an aqueous solution containing 20g of serine alcohol, heat to 80℃, stir the reaction for 4h, add sodium hydroxide aqueous solution dropwise during the reaction to maintain the pH of the reaction solution at 7, distill under reduced pressure, recrystallize the product in chloroform to obtain 2-tetradecanoic-4,6-diserine alcohol triazine.

[0042] Step (3): Under a nitrogen atmosphere, 16g of isophorone diisocyanate and 50g of dry polyethylene glycol were added to a flask and heated to 70°C. The mixture was reacted for 2.5h. Then, 120g of docosane, 26.5g of 2-tetradecanoic-4,6-diserine triazine, and 0.05g of dibutyltin dilaurate were added and reacted at 70°C for 6h. The mixture was then filtered, washed with ethanol, and dried to obtain the microcapsule phase change material.

[0043] Step (4): Add the microcapsule phase change material to water to prepare a finishing solution with a concentration of 400 g / L. Dip and rub the polyester fabric in the finishing solution twice (80% of the feed rate), pre-dry at 90°C for 5 min and at 160°C for 3 min to obtain a skin-friendly and cool polyester fabric.

[0044] Comparative Example 1:

[0045] Step (1): Under a nitrogen atmosphere, 14g of isophorone diisocyanate and 50g of dry polyethylene glycol were added to a flask and heated to 80°C. The mixture was reacted for 2.5h. Then, 90g of octadecane, 8.58g of trimethylolpropane (64mmol), and 0.035g of dibutyltin dilaurate were added. The mixture was reacted at 70°C for 6h. The mixture was filtered, washed with ethanol, and dried to obtain the microcapsule phase change material.

[0046] Step (2): Add the microcapsule phase change material to water to prepare a finishing solution with a concentration of 150 g / L. Dip and rub the polyester fabric in the finishing solution twice (80% of the feed rate), pre-dry at 80°C for 3 min and at 160°C for 4 min to obtain the polyester fabric.

[0047] Comparative Example 2:

[0048] Step (1): Under a nitrogen atmosphere, 14g of isophorone diisocyanate and 50g of dry polyethylene glycol were added to a flask and heated to 80°C. The mixture was reacted for 2.5h. Then, 90g of octadecane, 8.71g of pentaerythritol (64mmol), and 0.035g of dibutyltin dilaurate were added. The mixture was reacted at 70°C for 6h. The mixture was filtered, washed with ethanol, and dried to obtain the microcapsule phase change material.

[0049] Step (2): Add the microcapsule phase change material to water to prepare a finishing solution with a concentration of 150 g / L. Dip and rub the polyester fabric in the finishing solution twice (80% of the feed rate), pre-dry at 80°C for 3 min and at 160°C for 4 min to obtain the polyester fabric.

[0050] Comparative Example 3:

[0051] Step (1): In an ice-water bath, add 50 mL of toluene and 5 g of cyanuric chloride to a flask, and dropwise add 40 mL of a toluene solution containing 1.98 g of n-butylamine (27.07 mmol). Stir the reaction at 5 °C for 3 h, adding sodium hydroxide dropwise during the reaction to maintain the pH of the solution at 7. After the reaction, extract and wash successively with 0.4% hydrochloric acid solution, 0.8% sodium bicarbonate solution, and saturated sodium chloride solution. Dry the toluene organic layer with anhydrous sodium sulfate, filter, concentrate the filtrate under reduced pressure, and recrystallize the product from n-heptane to obtain 2-n-butylamino-4,6-dichlorotriazine. The structural formula is:

[0052] Step (2): Add 24.6 g of 2-n-butylamino-4,6-dichlorotriazine (111.84 mmol) and 50 mL of acetone to a flask, heat to 40 °C, slowly add 120 mL of an aqueous solution containing 20 g of serine alcohol, heat to 90 °C, stir the reaction for 3 h, add sodium hydroxide aqueous solution dropwise during the reaction to maintain the pH of the reaction solution at 7, distill under reduced pressure, and recrystallize the product in chloroform to obtain 2-n-butylamino-4,6-diserine triazine. The structural formula is:

[0053] Step (3): Under a nitrogen atmosphere, 14g of isophorone diisocyanate and 50g of dry polyethylene glycol were added to a flask and heated to 80°C. The mixture was reacted for 2.5h. Then, 90g of octadecane, 22.1g of 2-n-butylamino-4,6-diserine triazine (64mmol), and 0.035g of dibutyltin dilaurate were added. The mixture was reacted at 70°C for 6h. After filtration, washing with ethanol, and drying, the microcapsule phase change material was obtained.

[0054] Step (4): Add the microcapsule phase change material to water to prepare a finishing solution with a concentration of 150 g / L. Dip and rub the polyester fabric in the finishing solution twice (80% of the feed rate), pre-dry at 80°C for 3 min and at 160°C for 4 min to obtain the polyester fabric.

[0055] Unfinished polyester fabric was used as a blank control.

[0056] Hygroscopicity test:

[0057] The polyester fabric was placed in a constant temperature and humidity room (temperature 25℃, humidity 70%) for 72 hours and then weighed, recorded as W1. The sample was then transferred to an oven and dried at 100℃ until a constant weight was reached, recorded as W2. The moisture regain was calculated using the formula: Moisture regain (%) = (W1 - W2) / W2 × 100%.

[0058] Microcapsule core content measurement: Weigh out microcapsules with a mass of m1, grind them, and soak them in 10 mL of acetone for 12 hours to dissolve the encapsulated core in the acetone. Filter, wash with acetone, and dry at 60℃ to constant weight. Weigh the resulting microcapsule wall material with a mass of m2. Core encapsulation rate (%) = (m1-m2) / m1 × 100%.

[0059] Temperature rise performance test: Each group of fabrics was placed in a constant temperature environment of 15℃ and then placed on a flat plate heat preservation instrument at 50℃. The temperature of the fabric surface was measured with an infrared thermometer and the data was recorded.

[0060] Table 1 Performance Tests of Polyester Fabrics

[0061]

[0062] Table 2. Temperature rise performance of the fabric

[0063]

[0064] In all embodiments, 2-aliphatic amino-4,6-diserine triazine, synthesized from serine, cyanuric chloride, and fatty amines, was added. 2-aliphatic amino-4,6-diserine triazine has four hydroxyl groups, which undergo a chemical cross-linking reaction with isophorone diisocyanate and polyethylene glycol. The resulting polyurethane capsule wall forms a three-dimensional cross-linked network and a porous structure, which is beneficial for encapsulating more phase change material. Simultaneously, the long-chain alkyl groups of fatty amines have better compatibility with phase change core materials such as octadecane. Introducing these into the polyurethane capsule wall enhances the affinity between the capsule wall and the phase change material, further increasing the encapsulation content of the phase change core material. This results in better phase change performance and temperature regulation function of the phase change capsule. Furthermore, 2-aliphatic amino-4,6-diserine triazine has multiple hydrophilic imino groups. Introducing these into the polyurethane capsule wall, after finishing the polyester fabric, improves the fabric's hydrophilicity, enhances its moisture absorption capacity, and increases its moisture regain, thus improving the fabric's skin-friendly cooling effect.

[0065] As shown in Table 2, the temperature of all samples increased over time, but the magnitude of the increase varied significantly. The blank control showed the largest temperature increase, rising by 29.1°C from the initial temperature at 60 minutes. The examples showed a relatively smaller temperature increase. The comparative examples showed a temperature increase between the blank control and the examples. This indicates that, compared to the blank control and the comparative examples, the examples had a better effect in mitigating the temperature rise. This is because the polyurethane capsule in the examples had the best coating effect and coating amount for the phase change material. The phase change material undergoes a phase change and absorbs a large amount of latent heat as the external temperature changes, resulting in the best temperature-regulating and cooling function of the treated polyester fabric in the examples.

[0066] Compared to Example 1, Comparative Example 1 used trimethylolpropane as a chain extender, which contains only three hydroxyl groups. This limited cross-linking with isophorone diisocyanate and polyethylene glycol did not effectively form a three-dimensional cross-linked network and porous structure, hindering the encapsulation of phase change core materials such as octadecane. Furthermore, trimethylolpropane lacks long-chain alkanes, resulting in lower affinity between the polyurethane capsule wall and the phase change core material. Consequently, the encapsulation amount of the polyurethane capsule wall on the phase change core material was significantly lower than in Example 1, leading to poor phase change performance and temperature regulation. Additionally, trimethylolpropane lacks hydrophilic imino groups, resulting in poor overall hydrophilicity of the final microcapsules, which is detrimental to improving the moisture regain and hygroscopic properties of polyester.

[0067] In Comparative Example 2, pentaerythritol was selected as the chain extender. It does not contain long-chain alkyl groups, which results in low affinity between the polyurethane capsule wall and the phase change core material. This is not conducive to the polyurethane capsule wall's coating of the phase change core material. Furthermore, it does not contain hydrophilic imino groups, which leads to poor temperature regulation function and moisture regain of the polyester fabric.

[0068] In Comparative Example 3, n-butylamine was used to replace long-chain fatty amines in the synthesis of chain extenders. n-Butylamine has only short butyl chains, which are very different from the long alkyl chains of the target core material in terms of structure and hydrophobicity. This structural difference leads to a low chemical affinity between the synthesized chain extender and the final capsule wall polymer and the long-chain alkyl hydrocarbon core material. This significantly reduces the physical coating and adsorption capacity of the polyurethane capsule wall on the core material, affecting the temperature regulation function of the polyester fabric.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a skin-friendly and cooling polyester fabric, characterized in that, The preparation method is as follows: Step S1: Under a nitrogen atmosphere, isophorone diisocyanate and dry polyethylene glycol are added to a flask and heated to 70-80°C. The reaction is carried out for 2-2.5 hours. Then, phase change core material, 2-aliphatic amino-4,6-diserine triazine, and dibutyltin dilaurate are added. The reaction is carried out at 60-70°C for 4-6 hours. The mixture is filtered, washed with ethanol, and dried to obtain microcapsule phase change material. Step S2: Add the microcapsule phase change material to water to prepare a finishing solution. Dip and rub the polyester fabric twice in the finishing solution, pre-dry and bake to obtain a skin-friendly and cool polyester fabric.

2. The method for preparing the skin-friendly and cooling polyester fabric according to claim 1, characterized in that, In step S1, the phase change core material is an aliphatic hydrocarbon compound with the molecular formula C. a H 2a+2 , where a is 18-22.

3. The method for preparing the skin-friendly and cooling polyester fabric according to claim 1, characterized in that, In step S1, the amount of isophorone diisocyanate is 28-32 parts by weight, the amount of polyethylene glycol (2000) is 100 parts by weight, the amount of phase change core material is 180-240 parts by weight, the amount of dibutyltin dilaurate is 0.07-0.1 parts by weight, and the amount of 2-aliphatic amino-4,6-diserine triazine is 42-53 parts by weight.

4. The method for preparing the skin-friendly and cooling polyester fabric according to claim 1, characterized in that, In step S2, the mass concentration of the finishing solution is 150-400 g / L.

5. The method for preparing the skin-friendly and cooling polyester fabric according to claim 1, characterized in that, The preparation method of the 2-aliphatic amino-4,6-disermine triazine is as follows: Step (1): In an ice-water bath, toluene and cyanuric chloride were added to a flask, and a toluene solution of a fatty amine was added dropwise. The mixture was stirred and reacted. Sodium hydroxide was added dropwise during the reaction to maintain the pH of the solution at 7-8. After the reaction, the mixture was extracted and washed with hydrochloric acid solution, sodium bicarbonate solution and sodium chloride solution in sequence. The organic layer of toluene was dried with anhydrous sodium sulfate, filtered, and the filtrate was concentrated under reduced pressure. The product was recrystallized with n-heptane to obtain 2-fatty amino-4,6-dichlorotriazine. Step (2): Add 2-aliphatic amino-4,6-dichlorotriazine and acetone to the flask, heat to 30-40℃, slowly add an aqueous solution of serine alcohol, heat to 80-90℃, stir the reaction for 3-6 hours, add an aqueous solution of sodium hydroxide dropwise during the reaction to maintain the pH of the reaction solution at 7-8, distill under reduced pressure, recrystallize the product in chloroform to obtain 2-aliphatic amino-4,6-diserine triazine.

6. The method for preparing the skin-friendly and cooling polyester fabric according to claim 5, characterized in that, In step (1), the reaction temperature is 0-5℃ and the reaction time is 3-5h.

7. The method for preparing the skin-friendly and cooling polyester fabric according to claim 5, characterized in that, In step (1), the amount of cyanuric chloride used is 100 parts by weight, and the amount of fatty amine used is 85-146 parts by weight.

8. The method for preparing the skin-friendly and cooling polyester fabric according to claim 5, characterized in that, The molecular formula of the fatty amine is NH2-C n H 2n+1 n is any integer from 10 to 18.

9. The method for preparing the skin-friendly and cooling polyester fabric according to claim 5, characterized in that, In step (2), the amount of 2-aliphatic amino-4,6-dichlorotriazine is 170-230 parts by weight, and serine is 100 parts by weight.

10. A skin-friendly and cool-feeling polyester fabric obtained by the preparation method according to any one of claims 1-9.

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