A hydrophilic polyester fiber and its preparation method

Abstract

This application relates to the technical field of polyester fiber preparation, and specifically discloses a hydrophilic polyester fiber and a preparation method thereof. The hydrophilic polyester fiber of this application has a skin-core structure. The core layer is a polyester fiber, and the skin layer is formed by coating a hydrophilic coating on the surface of the polyester fiber. The hydrophilic coating is mainly made from the following raw materials: epoxy resin, curing agent, filler, hydrophilizing agent, sodium-based bentonite. The filler is at least two of pine nut powder, sepiolite powder, and attapulgite; the hydrophilizing agent is at least two of fatty alcohol polyoxyethylene ether, polyether-modified silicone, and multi-block poly(ethylene oxide terephthalate); the preparation method includes the following steps: mixing the epoxy resin, curing agent, filler, hydrophilizing agent, and sodium-based bentonite evenly to obtain a hydrophilic coating; coating the hydrophilic coating on the surface of the polyester fiber and then curing it to obtain the product. The hydrophilic polyester fiber prepared in this application has good hydrophilicity and a short water droplet diffusion time.

Description

Technical Field

[0001] This application relates to the technical field of polyester fiber preparation, and more specifically, it relates to a hydrophilic polyester fiber and a preparation method thereof. Background Art

[0002] Polyester fibers have high strength and elasticity, so they have the advantages of durability, wrinkle resistance, and no need for ironing. Polyester fibers have better light resistance than acrylic fibers and good resistance to various chemicals. Acids and alkalis cause little damage to them, and they are not afraid of mildew or moth damage.

[0003] However, due to the high regularity of the arrangement of polyester molecular chains, the lack of hygroscopic groups such as hydroxyl and amino groups, and only ester groups with relatively low polarity, while these structural characteristics endow polyester fibers with excellent mechanical properties, they also make polyester fibers have disadvantages such as low hygroscopicity and a stuffy feeling when wearing fabrics, reducing their wearing comfort.

[0004] In order to improve the hydrophilicity of polyester fibers, generally, fibers are prepared by blending or composite spinning polyester with hydrophilic materials, but the spinning process may cause difficulties in spinning and forming, making it difficult to prepare polyester fibers with better hydrophilicity. Summary of the Invention

[0005] In order to facilitate the preparation of polyester fibers with better hydrophilicity, this application provides a hydrophilic polyester fiber and a preparation method thereof.

[0006] In the first aspect, this application provides a hydrophilic polyester fiber, adopting the following technical scheme:

[0007] A hydrophilic polyester fiber, the fiber structure is a skin-core structure, the core layer is a polyester fiber, the skin layer is formed by coating a hydrophilic coating on the surface of the polyester fiber, and the hydrophilic coating is mainly made of the following raw materials in parts by weight: 50-60 parts of epoxy resin, 10-20 parts of curing agent, 5-10 parts of filler, 5-10 parts of hydrophilizing agent, 1-2 parts of sodium-based bentonite. The filler is at least two of pine nut powder, sepiolite powder, and attapulgite clay. The hydrophilizing agent is at least two of fatty alcohol polyoxyethylene ether, polyether-modified silicone, and multi-block poly(ethylene oxide terephthalate).

[0008] By adopting the above technical solution, the addition of epoxy resin helps to enhance the connection stability among the filler, the hydrophilic agent and the polyester fiber. Part of the hydrophilic agent forms a hydrophilic film on the surface of the polyester fiber to enhance the hydrophilicity of the polyester fiber, and part of the hydrophilic agent forms a hydrophilic film on the surface of the filler to further enhance the hydrophilicity of the filler. At the same time, the filler is arranged in the cortex, and pores are formed between adjacent filler particles, facilitating the formation of water flow channels. The sepiolite powder and attapulgite in the filler are both fibrous structures, so as to interweave and form a network structure in the cortex. The pine nut powder is distributed in the network structure, and the pine nut powder shrinks when encountering water, facilitating an increase in the pore volume in the cortex when encountering water, helping to further shorten the dripping diffusion time, and thus enhancing the hydrophilicity of the hydrophilic polyester fiber.

[0009] Preferably, the filler is composed of pine nut powder, sepiolite powder, and attapulgite in a mass ratio of (7 - 10):(1 - 2):(1 - 2).

[0010] By adopting the above technical solution, the filler is obtained by compounding three components: pine nut powder, sepiolite powder, and attapulgite. The ratio of the three components is adjusted to make the ratio of the three components reach the best. The crystal of attapulgite is rod-shaped and fibrous, with through channels in the layer, and the surface is uneven with grooves, having a large specific surface area. Most cations, water molecules, and organic molecules of a certain size can be directly adsorbed into the channels. At the same time, attapulgite is viscous and plastic when wet, has small shrinkage when dried, and does not crack. And due to its large specific surface area, it has a strong adsorption effect and is convenient for combining and interweaving with sepiolite powder; Sepiolite is a fibrous magnesium-rich silicate clay mineral containing water, and its crystal structure has transitional characteristics of layered and chain-like: two layers of silicon-oxygen tetrahedrons sandwich a layer of magnesium-oxygen octahedrons, and the two are arranged alternately to form a 2:1 layered structural unit, with channels parallel to the bonds arranged therein. This unique structure makes sepiolite have a large specific surface area and porosity; There are many small holes in the pine nut powder. When the surrounding moisture is too high, it absorbs the surrounding moisture and shrinks, and becomes hard when dried, so as to further improve the water permeability of the fiber.

[0011] Preferably, the pine nut powder is modified pine nut powder, and the modification method of the modified pine nut powder includes the following steps: impregnating the pine nut powder in a guar gum solution to obtain pretreated pine nut powder, mixing nano-silica with the pretreated pine nut powder, and drying to obtain the product.

[0012] By adopting the above technical solution, nano-silica is adhered to the outer layer of pine pollen powder. The addition of pine pollen powder makes the polyurethane outer layer form an uneven structure. At the same time, the contact area between the pine pollen powder and the adjacent hydrophilic agent is increased. At the same time, the pine pollen powder is prone to shrinkage when encountering water, facilitating the formation of a channel for water flow to pass through in the cortex, so as to further improve the hydrophilicity and moisture absorption of the fiber. And the pine pollen powder is relatively hard when dry, which helps to enhance the strength of the modified pine pollen powder.

[0013] Preferably, the particle size ratio of the pine pollen powder to the nano-silica is (5 - 7):1.

[0014] By adopting the above technical solution, the particle size ratio of the two components of pine pollen powder and nano-silica is adjusted to make the particle size ratio of pine pollen powder to nano-silica reach the best. The present application adopts a special particle size ratio of pine pollen powder and nano-silica, so that nano-silica may form a hydrophilic layer on the surface of the pine pollen powder. At the same time, there are pores between nano-silica and nano-silica, and between nano-silica and pine pollen powder, which is convenient for further enhancing the hydrophilicity of the hydrophilic polyester fiber and shortening the water drop diffusion time of the hydrophilic polyester fiber.

[0015] Preferably, the hydrophilic agent is composed of fatty alcohol polyoxyethylene ether, polyether-modified silicone, and multi-block poly(ethylene oxide terephthalate) in a mass ratio of (5 - 7):(3 - 4):(1 - 2).

[0016] By adopting the above technical solution, the hydrophilic agent is obtained by compounding three components: fatty alcohol polyoxyethylene ether, polyether-modified silicone, and multi-block poly(ethylene oxide terephthalate). Polyether-silicone is a polysiloxane modified by polyethylene glycol, and the hydrophilic part is polyethylene glycol, and the hydrophilic group is on the plane of the polyester fiber, which is convenient for water penetration and liquid transmission through the fiber capillary to improve the hydrophilic performance; the polymer molecule of multi-block poly(ethylene oxide terephthalate) contains polyoxyethylene ether bonds, which can form a continuous hydrophilic film on the surface of the polyester fiber, being rich in moisture absorption. At the same time, it contains crystalline polyester segments, and this segment has the same basic chemical structure as the polyester fiber, so the compatibility is better; fatty alcohol polyoxyethylene ether contains polyoxyethylene ether, has good hydrophilicity, and cooperates with multi-block poly(ethylene oxide terephthalate) to further form a hydrophilic film on the surface of the polyester fiber, so as to further improve the hydrophilicity of the polyester fiber.

[0017] In the second aspect, the present application provides a preparation method of a hydrophilic polyester fiber, adopting the following technical solution:

[0018] A preparation method of a hydrophilic polyester fiber, comprising the following steps:

[0019] (1) Preparation of hydrophilic coating: Epoxy resin, curing agent, filler, hydrophilizing agent, and sodium-based bentonite are mixed evenly to obtain the hydrophilic coating;

[0020] (2) Preparation of hydrophilic polyester fiber: The hydrophilic coating is coated on the surface of the polyester fiber and then cured at a curing temperature of 100 - 110 °C to obtain the product.

[0021] By adopting the above technical solution, the present application uses a self-made hydrophilic coating, which is coated on the surface of the polyester fiber to form a hydrophilic cortex. After the hydrophilic coating is coated, it is cured. The curing enhances the bonding strength of the hydrophilic coating on the surface of the polyester fiber, helps to enhance the firmness of the external hydrophilic cortex of the polyester fiber, thereby improving the hydrophilicity of the hydrophilic polyester fiber and shortening the water droplet diffusion time of the hydrophilic polyester fiber.

[0022] Preferably, the polyester fiber in step (2) is a hollow polyester fiber and has been subjected to pore-opening treatment. The method of pore-opening treatment includes the following steps: The hollow polyester fiber is immersed in the pore-opening treatment liquid, heated and kept warm, and then successively washed with hot water and cold water, and dried to obtain the product. Among them, the pore-opening treatment liquid is composed of sodium hydroxide and alkali weight reduction accelerator in a mass ratio of (5 - 7):1.

[0023] By adopting the above technical solution, the polyester fiber is a hollow polyester fiber. After the hollow polyester fiber is subjected to pore-opening treatment, the number of pores on the fiber surface increases, and through-holes are formed with the hollow part, which is convenient for enhancing the water permeability of the polyester fiber, so as to increase the hydrophilicity of the polyester fiber and help reduce the water droplet diffusion time of the polyester fiber.

[0024] Preferably, the heating temperature is 120 - 130 °C, and the heat preservation time is 20 - 30 min.

[0025] By adopting the above technical solution, when the heating temperature is low, the mass loss rate of the fiber is small, the pore diameter and depth of the formed through-holes are small, which is not conducive to water passing through. When the heating temperature is high, the strength loss rate and mass loss rate are large, affecting the strength of the fiber. When the heat preservation time is too long, the strength loss of the fiber is large, affecting the use effect of the fiber. The inventors of the present application have found that adopting the heating temperature and heat preservation time within the scope of the present application helps to make the pore diameter of the through-holes appropriate and has a small impact on the strength of the fiber.

[0026] Preferably, the polyester fiber in step (2) has been pretreated. The method of pretreatment includes the following steps: The polyester fiber is put into absolute ethanol for ultrasonic cleaning and drying.

[0027] By adopting the above technical solution, the polyester fiber is convenient to reduce the impurities and grease on the surface after ultrasonic alcohol washing, which is convenient to further improve the connection stability between the outer surface of the fiber and the hydrophilic coating, so as to further improve the hydrophilicity of the polyester fiber.

[0028] In summary, the present application has the following beneficial effects:

[0029] 1. The hydrophilic polyester fiber of the present application has a core-shell structure with a polyester fiber core layer and a hydrophilic layer cortex. The cortex is formed by coating a hydrophilic coating on the surface of the polyester fiber. The hydrophilic coating contains a hydrophile, and the hydrophile forms a hydrophilic film on the surface of the polyester fiber, which helps to enhance the hydrophilicity of the polyester fiber.

[0030] 2. The hydrophilic coating in the cortex of the hydrophilic polyester fiber of the present application contains fillers, and the fillers are at least two of pine nut powder, sepiolite powder, and attapulgite. Both sepiolite powder and attapulgite in the fillers have a fibrous structure, so as to interweave and form a network structure in the cortex, and the pine nut powder is distributed in the network structure, which helps to further enhance the hydrophilicity of the hydrophilic layer, and thus reduce the water droplet diffusion time. Specific Embodiments

[0031] The following further elaborates on the present application with reference to embodiments.

[0032] The preparation method of the multi-block polyethylene oxide polyethylene terephthalate of the present application is prepared by the prior art, see [Zhang Xiaoyun, Lü Zhifeng, etc. Study on the Thermal Properties of Multi-block Polyethylene Oxide Polyethylene Terephthalate [J]. Petrochemical Technology, 2003(32): 650-652].

[0033] The polyether-modified silicone of the present application is commercially available.

[0034] The molecular formula of the fatty alcohol polyoxyethylene ether of the present application is C 12 H 25 O·(C 2 H 4 O)n, where n = 5.

[0035] The preparation method of the sepiolite powder of the present application includes the following steps: mixing sepiolite powder with a calcium chloride solution to obtain a mixture, stirring the mixture until it is dry and loose, and drying it in an oven at 110 °C to obtain it. Among them, the mass ratio of sepiolite powder to calcium chloride is 8:2. The mass fraction of the calcium chloride solution is 85%.

[0036] The alkali weight reduction promoter of the present application is commercially available.

[0037] Example 1

[0038] An embodiment of the present application discloses a hydrophilic polyester fiber. The fiber structure is a core-shell structure, where the core layer is a polyester fiber, and the skin layer is formed by coating a hydrophilic coating on the surface of the polyester fiber. The radius ratio of the skin layer to the core layer is 0.2;

[0039] The hydrophilic coating is made from raw materials with the following masses: 50 kg of epoxy resin, 10 kg of curing agent, 5 kg of filler, 5 kg of hydrophilizing agent, and 1 kg of sodium-based bentonite. The curing agent is an aliphatic polyamine, and the aliphatic polyamine is diethylenetriamine; the filler is composed of pine nut powder and sepiolite powder in a mass ratio of 1:1, and the hydrophilizing agent is composed of fatty alcohol polyoxyethylene ether and polyether-modified silicone in a mass ratio of 5:4.

[0040] An embodiment of the present application also discloses a preparation method of the hydrophilic polyester fiber, which includes the following steps:

[0041] (1) Preparation of the hydrophilic coating: Mix epoxy resin, curing agent, filler, hydrophilizing agent, and sodium-based bentonite evenly to obtain the hydrophilic coating; the mixing temperature is 40 °C;

[0042] (2) Preparation of the hydrophilic polyester fiber: Coat the hydrophilic coating on the surface of the polyester fiber, and then cure it. The curing temperature is 100 °C to obtain the product, where the curing time is 8 min. Among them, the polyester fiber is pretreated before coating the hydrophilic coating. The pretreatment method includes the following steps: Put the polyester fiber into absolute ethanol for ultrasonic cleaning and drying.

[0043] Example 2: A hydrophilic polyester fiber, the difference from Example 1 is that:

[0044] The hydrophilic coating is made from raw materials with the following masses: 60 kg of epoxy resin, 20 kg of curing agent, 10 kg of filler, 10 kg of hydrophilizing agent, and 2 kg of sodium-based bentonite.

[0045] Example 3: A hydrophilic polyester fiber, the difference from Example 2 is that:

[0046] The filler in the hydrophilic coating is composed of pine nut powder, sepiolite powder, and attapulgite in a mass ratio of 1:1:1, and the particle size ratio of the three components of pine nut powder, sepiolite powder, and attapulgite is 1:1:4.

[0047] Example 4: A hydrophilic polyester fiber, the difference from Example 2 is that:

[0048] The filler in the hydrophilic coating is composed of pine nut powder, sepiolite powder, and attapulgite in a mass ratio of 7:1:1, and the particle size ratio of the three components of pine nut powder, sepiolite powder, and attapulgite is 1:1:4.

[0049] Example 5: A hydrophilic polyester fiber, the difference from Example 2 is that:

[0050] The filler in the hydrophilic coating is composed of pine nut powder, sepiolite powder, and attapulgite clay in a mass ratio of 10:2:2, and the particle size ratio of the three components of pine nut powder, sepiolite powder, and attapulgite clay is 1:1:4.

[0051] Example 6: A hydrophilic polyester fiber, different from Example 5 in that:

[0052] The pine nut powder is modified pine nut powder, and the modification method of the modified pine nut powder includes the following steps: impregnating the pine nut powder in a guar gum solution to obtain pretreated pine nut powder, mixing nano-silica with the pretreated pine nut powder, and drying to obtain it. The particle size ratio of pine nut powder to nano-silica is 2:1.

[0053] Example 7: A hydrophilic polyester fiber, different from Example 6 in that:

[0054] The particle size ratio of pine nut powder to nano-silica is 5:1.

[0055] Example 8: A hydrophilic polyester fiber, different from Example 6 in that:

[0056] The particle size ratio of pine nut powder to nano-silica is 10:1.

[0057] Example 9: A hydrophilic polyester fiber, different from Example 7 in that:

[0058] The hydrophilizing agent of the hydrophilic coating is composed of fatty alcohol polyoxyethylene ether, polyether-modified silicone, and multi-block polyethylene oxide polyethylene terephthalate in a mass ratio of 5:3:1.

[0059] Example 10: A hydrophilic polyester fiber, different from Example 9 in that:

[0060] The specific operation of step (2) is as follows: coating the hydrophilic coating on the surface of the polyester fiber, and then curing at a curing temperature of 110°C to obtain it, where the curing time is 8 min. Among them, the polyester fiber is a hollow polyester fiber and has been subjected to an opening treatment. The method of the opening treatment includes the following steps: impregnating the hollow polyester fiber in an opening treatment liquid, heating to 130°C, holding for 20 min, successively washing with hot water and cold water, and drying to obtain it, where the opening treatment liquid is composed of sodium hydroxide and an alkali weight reduction promoter in a mass ratio of 5:1. The opened polyester fiber is pretreated, and the pretreatment method includes the following steps: putting the opened polyester fiber into absolute ethanol for ultrasonic cleaning and drying, and the cleaning time is 18 min.

[0061] Comparative Example

[0062] Comparative Example 1: A hydrophilic polyester fiber, which is different from Example 1 in that the raw materials of the hydrophilic coating are different. Specifically, the hydrophilizing agent is replaced with an equal amount of filler, that is, the amount of the hydrophilizing agent is 0, and the amount of the filler is 10 kg.

[0063] Comparative Example 2: A hydrophilic polyester fiber, which is different from Example 1 in that the raw materials of the hydrophilic coating are different. Specifically, the filler is replaced with an equal amount of hydrophilizing agent, that is, the amount of the filler is 0, and the amount of the hydrophilizing agent is 10 kg.

[0064] Comparative Example 3: A hydrophilic polyester fiber, which is different from Example 1 in that the filler is pine nut powder.

[0065] Comparative Example 4: A hydrophilic polyester fiber, which is different from Example 1 in that the hydrophilizing agent is fatty alcohol polyoxyethylene ether.

[0066] Detection Method

[0067] Hydrophilicity detection: Take the hydrophilic polyester fibers prepared in Examples 1-10 and Comparative Examples 1-4, and according to the detection method in GB / T21655.1-2008 "Evaluation of moisture absorption and quick-drying properties of textiles - Part 1: Single combination test method", detect the water drop diffusion time, and the diffusion time results are shown in Table 1.

[0068] Table 1 Hydrophilicity performance test of hydrophilic polyester fibers in Examples 1-10 and Comparative Examples 1-4

[0069]

[0070]

[0071] Combined with Example 1, Comparative Examples 1-2, and combined with the data in Table 1, it can be seen that the water drop diffusion time of the hydrophilic polyester fibers prepared in Comparative Examples 1-2 is longer. When any one of the filler and the hydrophilizing agent is missing, the water drop diffusion time of the prepared hydrophilic polyester fiber is longer than that of the present application. The inventors of the present application believe that when the filler and the hydrophilizing agent in the skin layer cooperate with each other and act synergistically, it helps to improve the hydrophilicity of the skin layer, and thus improve the hydrophilicity of the hydrophilic polyester fiber.

[0072] Combined with Example 1, Comparative Examples 3-4, and combined with the data in Table 1, it can be seen that when the filler is a single type, the hydrophilicity of the prepared hydrophilic polyester fiber is lower than that of Example 1. When the hydrophilizing agent is a single type, the hydrophilicity of the prepared hydrophilic polyester fiber is lower than that of Example 1. Therefore, the inventors of the present application believe that: the filler being compounded by multiple components or the hydrophilizing agent being compounded by multiple components helps to improve the hydrophilicity of the prepared hydrophilic polyester fiber.

[0073] Combined with Examples 1-2 and the data in Table 1, it can be seen that the hydrophilic polyester fibers prepared in Examples 1-2 have a short water droplet diffusion time, indicating that a hydrophilic layer formed by coating a hydrophilic coating on the surface of the polyester fiber has a great influence on the hydrophilicity of the hydrophilic polyester fiber.

[0074] Combined with Examples 2-5 and the data in Table 1, it can be seen that when the filler is a compound of three components: pine nut powder, sepiolite powder, and attapulgite clay and is used in a specific ratio, the prepared hydrophilic polyester fiber has better performance. The inventors of the present application believe that: the components of the filler and the ratio of each component have a great influence on the performance of the hydrophilic polyester fiber and cannot be randomly selected.

[0075] Combined with Examples 5-6 and the data in Table 1, it can be seen that the water droplet diffusion time of the hydrophilic polyester fiber prepared in Example 6 is shorter than that of the hydrophilic polyester fiber prepared in Example 5. The difference between Example 5 and Example 6 is that: the pine nut powder in Example 6 is modified and coated with a layer of nano-silica on the outer layer. The inventors of the present application believe that: coating a layer of nano-silica on the surface of the pine nut powder increases the contact area of the pine nut powder with the adhered nano-silica, and pores are formed between adjacent nano-silicas, which helps the passage of water and shortens the water droplet diffusion time.

[0076] Combined with Examples 6-8 and the data in Table 1, it can be seen that the water droplet diffusion time of the hydrophilic polyester fiber prepared in Example 7 is shorter than that of the hydrophilic polyester fiber prepared in Example 6, and the water droplet diffusion time of the hydrophilic polyester fiber prepared in Example 7 is shorter than that of the hydrophilic polyester fiber prepared in Example 8. The difference between Examples 7-8 and Example 6 is the particle size ratio of the pine nut powder to the nano-silica. The inventors of the present application believe that: when the particle size ratio between the nano-silica and the pine nut powder is within the scope of the present application, more pores are formed on the surface of the pine nut powder by the nano-silica, and the influence on the cortex strength is smaller. Therefore, when the particle size ratio of the nano-silica to the pine nut powder is at an appropriate ratio, the prepared hydrophilic polyester fiber has better performance.

[0077] Combined with Example 7 and Example 9 and the data in Table 1, it can be seen that the water droplet diffusion time of the hydrophilic polyester fiber prepared in Example 9 is shorter than that of the hydrophilic polyester fiber prepared in Example 7. The difference between Example 9 and Example 7 is that: the hydrophile in the hydrophilic coating of Example 9 is obtained by compounding three components: fatty alcohol polyoxyethylene ether, polyether modified silicone, and multi-block polyethylene oxide polyethylene terephthalate. The inventors of the present application believe that when the hydrophile is compounded from multiple components in a special ratio, the hydrophilic polyester fiber prepared therefrom has better hydrophilic performance.

[0078] Combined with Examples 9-10 and the data in Table 1, it can be seen that the water droplet diffusion time of the hydrophilic polyester fiber prepared in Example 10 is shorter than that of the hydrophilic polyester fiber prepared in Example 9. The difference between Example 10 and Example 9 is that during the preparation of the hydrophilic polyester fiber in Example 10, the polyester fiber in the core layer is treated, and hollow polyester fibers are used, and holes are opened on the surface of the polyester fiber and communicated with the hollow part to further shorten the water droplet diffusion time on the surface of the hydrophilic polyester fiber.

[0079] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A hydrophilic polyester fiber, characterized in that, the fiber structure is a skin-core structure, the core layer is a polyester fiber, the skin layer is formed by coating a hydrophilic coating on the surface of the polyester fiber, and the hydrophilic coating is mainly made of raw materials in the following weight parts: 50-60 parts of epoxy resin, 10-20 parts of curing agent, 5-10 parts of filler, 5-10 parts of hydrophile, 1-2 parts of sodium-based bentonite, and the filler is at least two of pine nut powder, sepiolite powder, and attapulgite; the hydrophile is composed of fatty alcohol polyoxyethylene ether, polyether-modified silicone, and multi-block polyethylene oxide polyethylene terephthalate in a mass ratio of (5-7):(3-4):(1-2); the pine nut powder is modified pine nut powder, and the modification method of the modified pine nut powder includes the following steps: impregnating the pine nut powder in a guar gum solution to obtain pretreated pine nut powder, mixing nano-silica with the pretreated pine nut powder, and drying to obtain it; the polyester fiber is a hollow polyester fiber and has been subjected to an opening treatment, and the opening treatment method includes the following steps: impregnating the hollow polyester fiber in an opening treatment liquid, heating and maintaining the temperature, and then successively washing with hot water and cold water, and drying to obtain it, wherein the opening treatment liquid is composed of sodium hydroxide and an alkali weight reduction accelerator in a mass ratio of (5-7):1; A preparation method of the hydrophilic polyester fiber includes the following steps, (1) Preparation of the hydrophilic coating: Mix epoxy resin, curing agent, filler, hydrophile, and sodium-based bentonite evenly to obtain the hydrophilic coating; (2) Preparation of the hydrophilic polyester fiber: Coat the hydrophilic coating on the surface of the polyester fiber, and then cure it at a curing temperature of 100-110°C to obtain it.

2. A hydrophilic polyester fiber according to claim 1, characterized in that: the filler is composed of pine nut powder, sepiolite powder, and attapulgite in a mass ratio of (7-10):(1-2):(1-2).

3. A hydrophilic polyester fiber according to claim 1, characterized in that: the particle size ratio of the pine nut powder to the nano-silica is (5-7):

1.

4. A hydrophilic polyester fiber according to claim 1, characterized in that: the heating temperature is 120-130°C, and the heat preservation time is 20-30 min.

5. A hydrophilic polyester fiber according to claim 1, characterized in that: the polyester fiber in step (2) has been pretreated, and the pretreatment method includes the following steps: putting the polyester fiber into absolute ethanol for ultrasonic cleaning and drying.

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