A polysiloxane modified polyester fiber, a preparation method thereof, and application thereof

Abstract

This application discloses a polysiloxane-modified polyester fiber, its preparation method, and its application. On one hand, this application provides a polysiloxane-modified polyester fiber, wherein the mass ratio of each raw material component of the polysiloxane-modified polyester fiber includes: 100 parts PET resin, 28-36 parts hydrophilic polysiloxane polyurethane prepolymer, 8-12 parts PE wax, 8-12 parts cinnamaldehyde-modified nano-titanium dioxide, and 0.2-0.5 parts composite antioxidant; the mass ratio of each raw material component of the hydrophilic polysiloxane polyurethane prepolymer includes: 100 parts polyether-modified isocyanate curing agent, 20-28 parts aminated modified hydroxyl-terminated polysiloxane, and 10-14 parts eugenol. On the other hand, this application provides a preparation method and application of the above-mentioned polysiloxane-modified polyester fiber. The polyester fiber of this application has excellent softness and skin-friendliness, good breathability, and excellent antibacterial properties.

Description

Technical Field

[0001] This application relates to the field of automotive interior materials technology, and in particular to a polysiloxane-modified polyester fiber, its preparation method and its application. Background Technology

[0002] With the development of the automotive industry and the upgrading of consumption, people are paying increasing attention to the functionality of car interiors. As the largest surface area in the car cabin and the material that comes into direct contact with users, the safety, low-carbon environmental friendliness, skin-friendly comfort, and health aspects of car interior materials are increasingly being considered by users. Currently, polyester fiber is the most widely used and consumed material in automotive interiors. Materials such as car seat fabrics, seat covers, carpets, curtains, and headliner fabrics mostly use polyester fibers. This is mainly based on the comprehensive consideration of polyester fiber's excellent physical and chemical properties and relatively low cost.

[0003] However, driven by the current upgrading of the automotive industry and people's increasing demands for the quality of automotive interiors, polyester fiber is gradually becoming unable to meet the requirements. The main component of polyester fiber is PET resin. As a resin material with a lack of polar functional groups in its molecular chain, high crystallinity, and tight molecular arrangement, polyester fiber has high hardness and extremely poor moisture absorption. It also suffers from problems such as insufficient skin-friendliness and breathability, and insufficient softness, which seriously affect the comfort of use.

[0004] Although existing technologies can impart hydrophilicity, a certain degree of softness, and skin-friendly breathability to polyester fibers through surface treatments such as hydrophilic finishing and softening finishing, these surface treatment coatings are extremely prone to peeling off due to wear during use, leading to functional failure.

[0005] Therefore, how to improve the softness, skin-friendly breathability, and comfort of polyester fibers in a long-term manner is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] In order to solve at least one of the above-mentioned technical problems and to develop a polyester material for automotive interiors with excellent softness and skin-friendliness, good breathability and excellent antibacterial properties, this application provides a polysiloxane-modified polyester fiber, its preparation method and its application.

[0007] On one hand, this application provides a polysiloxane-modified polyester fiber, wherein the mass ratio of each raw material component of the polysiloxane-modified polyester fiber includes: 100 parts of PET resin, 28-36 parts of hydrophilic polysiloxane polyurethane prepolymer, 8-12 parts of PE wax, 8-12 parts of cinnamaldehyde-modified nano-titanium dioxide, and 0.2-0.5 parts of composite antioxidant; the mass ratio of each raw material component of the hydrophilic polysiloxane polyurethane prepolymer includes: 100 parts of polyether-modified isocyanate curing agent, 20-28 parts of aminated hydroxyl-terminated polysiloxane, and 10-14 parts of eugenol; the PE wax is selected from products with a thermal decomposition temperature not exceeding 250℃.

[0008] Optionally, the mass ratio of each raw material component of the polysiloxane modified polyester fiber includes: 100 parts of PET resin, 32-33 parts of hydrophilic polysiloxane polyurethane prepolymer, 9.6-10 parts of PE wax, 10-10.6 parts of cinnamaldehyde modified nano titanium dioxide, and 0.4-0.42 parts of composite antioxidant.

[0009] Optionally, the polyether-modified isocyanate curing agent is prepared by reacting polyether polyol and IPDI trimer curing agent in a molar ratio of hydroxyl to isocyanate group of 42~44:100.

[0010] Optionally, the preparation of the aminated modified hydroxyl-terminated polysiloxane includes the following steps:

[0011] Sa, weigh N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane and hydroxyl-terminated polysiloxane precisely in a molar ratio of 1:1.4~1.8;

[0012] Sb, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane was hydrolyzed with water, and then dried under vacuum at 40 degrees Celsius to obtain the hydrolysis product;

[0013] Sc. The hydrolysis product is thoroughly mixed with the hydroxyl-terminated polysiloxane, and sodium hydroxide is added at 10% of the total mass of the mixture. The mixture is reacted at 75-80°C for 4.5 hours under nitrogen protection. Then, the mixture is heated to 175-180°C under a vacuum of 0.05-0.1 MPa to remove low molecular weight components. After cooling, the sodium hydroxide is filtered off to obtain the aminated modified hydroxyl-terminated polysiloxane.

[0014] Optionally, the preparation of the hydrophilic polysiloxane polyurethane prepolymer includes the following steps:

[0015] S1-1. Mix the formulated amounts of polyether-modified isocyanate curing agent, amino-modified hydroxyl-terminated polysiloxane, and eugenol thoroughly to obtain a reaction mixture;

[0016] S1-2. The reaction mixture is reacted at 75~80℃ for 3.5h to obtain a hydrophilic polysiloxane polyurethane prepolymer.

[0017] Optionally, the preparation of the cinnamaldehyde-modified nano-titanium dioxide includes the following steps:

[0018] S2-1. Weigh KH550 and fumed nano titanium dioxide precisely according to a mass ratio of 3.8:5.

[0019] S2-2. Dissolve KH550 in 50% ethanol solution to prepare a solution with a concentration of 1.5 g / L, heat to 60℃ and react for 45 min, then add gas phase nano titanium dioxide and sonicate for 30 min to obtain a reaction mixture.

[0020] S1-3. According to the addition ratio of 1g nano titanium dioxide to 55mL cinnamaldehyde, accurately weigh cinnamaldehyde and add it to the reaction mixture. Continue to sonicate for 60min, then stir for 36h. Filter out the solid product, wash it with alcohol, and dry it under vacuum at 45℃ to constant weight to obtain cinnamaldehyde-modified nano titanium dioxide.

[0021] Optionally, the composite antioxidant is selected from antioxidant B225.

[0022] Secondly, this application provides a method for preparing the above-mentioned polysiloxane-modified polyester fiber, comprising the following steps:

[0023] S1. Preparation of hydrophilic polysiloxane polyurethane prepolymer;

[0024] S2. Preparation of cinnamaldehyde-modified nano-titanium dioxide;

[0025] S3. Weigh the raw materials according to the formula, mix them thoroughly to obtain a premix, add it to a twin-screw extruder, melt extrusion and granulation to obtain modified polyester masterbatch;

[0026] S4. The modified polyester masterbatch obtained in step S3 is subjected to a hot melt spinning process to obtain polysiloxane modified polyester fiber, with a spinning temperature of 280~285℃.

[0027] Optionally, in step S3, the extrusion molding process parameters are as follows: the temperatures of the six temperature zones are 175~180℃, 180~185℃, 185~190℃, 190~195℃, 185~190℃, and 180~185℃ respectively.

[0028] Thirdly, this application provides the application of the aforementioned polysiloxane-modified polyester fibers in the field of automotive interior textile fabrics.

[0029] In summary, the present invention has at least one of the following beneficial technical effects:

[0030] 1. This application uses aminated hydroxyl polysiloxane as the modifying component and polyether-modified isocyanate curing agent as the carrier. Through prepolymerization, blending, and curing, a dense polyurethane crosslinking network is formed inside the polyester material, thus completing the crosslinking modification of the polyester material. The introduction of polyether imparts good hydrophilicity modification to the material. At the same time, this application adds PE wax with a low thermal decomposition temperature to the material system. In addition to its lubricating effect, it can also act as a pore-forming agent, generating gas through thermal decomposition during hot melt spinning, resulting in a certain amount of pores in the fiber. The above design makes the polyester fiber obtained by this application have excellent hydrophilicity and good air permeability.

[0031] 2. This application uses a polyether-modified isocyanate curing agent as a carrier to achieve crosslinking modification, enabling the formation of crosslinking networks of polysiloxane-type polyurethane and polyether-type polyurethane within the fiber. The polyether-type polyurethane crosslinking network has good flexibility, which can effectively improve the hardness of polyester materials and enhance their flexibility and toughness. Furthermore, the modification with a polysiloxane-type polyurethane crosslinking network containing amino polysiloxane groups results in polyester fibers prepared in this application possessing excellent softness and skin-friendliness, significantly improving user comfort.

[0032] 3. This application introduces eugenol groups into the polyurethane crosslinking network, and uses cinnamaldehyde-modified nano-titanium dioxide as a filler and ultraviolet shielding agent to form a green antibacterial system composed of eugenol groups and cinnamaldehyde groups, which makes the polyester fiber prepared by this application have good antibacterial properties. Detailed Implementation

[0033] The present application will be further described in detail below with reference to the embodiments.

[0034] This application provides a polysiloxane-modified polyester fiber. The raw material components of the polysiloxane-modified polyester fiber are formulated in the following proportions by weight: 100 parts PET resin, 28-36 parts hydrophilic polysiloxane polyurethane prepolymer, 8-12 parts PE wax, 8-12 parts cinnamaldehyde-modified nano-titanium dioxide, and 0.2-0.5 parts composite antioxidant. The raw material components of the hydrophilic polysiloxane polyurethane prepolymer are formulated in the following proportions by weight: 100 parts polyether-modified isocyanate curing agent, 20-28 parts amino-modified hydroxyl-terminated polysiloxane, and 10-14 parts eugenol. The PE wax is selected from products with a thermal decomposition temperature not exceeding 250°C.

[0035] The preparation method of the above-mentioned polysiloxane-modified polyester fiber includes the following steps:

[0036] S1. Preparation of hydrophilic polysiloxane polyurethane prepolymer;

[0037] S2. Preparation of cinnamaldehyde-modified nano-titanium dioxide;

[0038] S3. Weigh the raw materials according to the formula, mix them thoroughly to obtain a premix, add it to a twin-screw extruder, melt extrusion and granulation to obtain modified polyester masterbatch;

[0039] S4. The modified polyester masterbatch obtained in step S3 is subjected to a hot melt spinning process to obtain polysiloxane modified polyester fiber, with a spinning temperature of 280~285℃.

[0040] The aforementioned polysiloxane-modified polyester fibers are mainly used in the field of automotive interior textile fabrics.

[0041] Prior to this application, functionalized polyester fibers prepared in the prior art, due to the characteristics of PET resin, struggled to achieve satisfactory user comfort. Polyester fibers exhibit relatively high hardness, poor softness, and poor moisture absorption, resulting in poor skin-friendliness and breathability – persistent technical challenges in this field. Existing solutions involve surface treatment with various finishing agents to apply functionalized coatings to the polyester fiber surface, addressing these issues. However, this solution has significant drawbacks when applied to automotive interiors. During vehicle use, polyester fiber fabrics in many critical areas are subjected to frequent friction; this fatigue wear easily damages and peels off the functional coating, leading to functional failure. Furthermore, the durability of functionalized polyester fibers produced by these surface treatment techniques in automotive interiors is generally insufficient.

[0042] This application, through a special design and cross-linking chemical modification, directly modifies the polyester fiber itself, enabling the resulting polyester fiber to possess various long-lasting functions. Firstly, this application designs a dual polyurethane cross-linking system using aminated modified hydroxyl-terminated polysiloxane and polyether-modified isocyanate curing agent as raw materials. The polyether-type polyurethane cross-linking system is used to improve the flexibility and hydrophilicity of the polyester fiber, making it softer, more skin-friendly, and possessing excellent breathability. The modified polysiloxane-type polyurethane cross-linking system is used to improve the smoothness of the polyester fiber, further enhancing its skin-friendliness. This dual polyurethane cross-linking system design allows the polyester fiber to achieve excellent functional modifications, which, when applied to the material itself, result in good durability. Furthermore, this application designs a specific ratio, introducing a PE wax lubricant that decomposes easily at low temperatures. During spinning, the gas generated by the decomposition of the PE wax is released, allowing the resulting polyester fiber to distribute pores. This method can further effectively improve the effect of various functional modifications.

[0043] The following are preparation examples and embodiments of this application.

[0044] The main raw materials used in the embodiments of this application are all commercially available.

[0045] Among them, PET resin was purchased from Hubei Jusheng Technology Co., Ltd.; IPDI trimer curing agent, Covestro Z4470 BAIPDI trimer curing agent (including catalyst), was purchased from Guangzhou Haoyi New Material Technology Co., Ltd.; polyether polyol, polyether PPG-400, was purchased from Guangzhou Qixu Chemical Co., Ltd.; N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane was purchased from Wuhan Kemeiwo Chemical Co., Ltd.; hydroxyl-terminated polysiloxane was purchased from Wuhan Kemike Biomedical Technology Co., Ltd.; eugenol was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; fumed nano titanium dioxide, NF-50, was purchased from Hubei Huifu Nanomaterials Co., Ltd.; KH550 was purchased from Hubei Changfu Chemical Co., Ltd.; cinnamaldehyde was purchased from Hubei Qibu New Material Technology Co., Ltd.; PE wax, thermal decomposition temperature 200~250℃, was purchased from Shandong Bangtai Chemical Co., Ltd.; composite antioxidant, BASF B225, was purchased from Nanjing Kexulai Chemical Co., Ltd.

[0046] The mass ratio of each raw material component in the polysiloxane-modified polyester fiber includes: 100 parts PET resin, 28-36 parts hydrophilic polysiloxane polyurethane prepolymer, 8-12 parts PE wax, 8-12 parts cinnamaldehyde-modified nano titanium dioxide, and 0.2-0.5 parts composite antioxidant; the mass ratio of each raw material component in the hydrophilic polysiloxane polyurethane prepolymer includes: 100 parts polyether-modified isocyanate curing agent, 20-28 parts amino-modified hydroxyl-terminated polysiloxane, and 10-14 parts eugenol; the PE wax is selected from products with a thermal decomposition temperature not exceeding 250℃.

[0047] The following is a preparation example of this application.

[0048] Preparation Example 1

[0049] The preparation of the polyether-modified isocyanate curing agent in this example includes the following steps:

[0050] According to the molar ratio of hydroxyl to isocyanate groups of 42:100, the polyether polyol and Z4470BA IPDI trimer curing agent were accurately weighed, thoroughly mixed, and reacted at 60°C for 1 hour to obtain the polyether modified isocyanate curing agent.

[0051] Preparation Example 2

[0052] The preparation of the polyether-modified isocyanate curing agent in this example includes the following steps:

[0053] According to the molar ratio of hydroxyl to isocyanate groups of 44:100, the polyether polyol and Z4470BA IPDI trimer curing agent were accurately weighed, thoroughly mixed, and reacted at 60°C for 1 hour to obtain the polyether modified isocyanate curing agent.

[0054] Preparation Example 3

[0055] The preparation of the aminated modified hydroxyl-terminated polysiloxane in this example includes the following steps:

[0056] Sa, weigh N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane and hydroxyl-terminated polysiloxane precisely according to a molar ratio of 1:1.4;

[0057] Sb, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane was hydrolyzed with water, and then dried under vacuum at 40 degrees Celsius to obtain the hydrolysis product;

[0058] Sc. The hydrolysis product is thoroughly mixed with the hydroxyl-terminated polysiloxane, and sodium hydroxide is added at 10% of the total mass of the mixture. The mixture is reacted at 75-80°C for 4.5 hours under nitrogen protection. Then, the mixture is heated to 175-180°C under a vacuum of 0.05-0.1 MPa to remove low molecular weight components. After cooling, the sodium hydroxide is filtered off to obtain the aminated modified hydroxyl-terminated polysiloxane.

[0059] Preparation Example 4

[0060] The preparation of the aminated modified hydroxyl-terminated polysiloxane in this example includes the following steps:

[0061] Sa, weigh N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane and hydroxyl-terminated polysiloxane precisely according to a molar ratio of 1:1.8;

[0062] Sb, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane was hydrolyzed with water, and then dried under vacuum at 40 degrees Celsius to obtain the hydrolysis product;

[0063] Sc. The hydrolysis product is thoroughly mixed with the hydroxyl-terminated polysiloxane, and sodium hydroxide is added at 10% of the total mass of the mixture. The mixture is reacted at 75-80°C for 4.5 hours under nitrogen protection. Then, the mixture is heated to 175-180°C under a vacuum of 0.05-0.1 MPa to remove low molecular weight components. After cooling, the sodium hydroxide is filtered off to obtain the aminated modified hydroxyl-terminated polysiloxane.

[0064] Preparation Example 5

[0065] The preparation of the aminated modified hydroxyl-terminated polysiloxane in this example includes the following steps:

[0066] Sa, weigh N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane and hydroxyl-terminated polysiloxane precisely in a molar ratio of 1:1.6;

[0067] Sb, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane was hydrolyzed with water, and then dried under vacuum at 40 degrees Celsius to obtain the hydrolysis product;

[0068] Sc. The hydrolysis product is thoroughly mixed with the hydroxyl-terminated polysiloxane, and sodium hydroxide is added at 10% of the total mass of the mixture. The mixture is reacted at 75-80°C for 4.5 hours under nitrogen protection. Then, the mixture is heated to 175-180°C under a vacuum of 0.05-0.1 MPa to remove low molecular weight components. After cooling, the sodium hydroxide is filtered off to obtain the aminated modified hydroxyl-terminated polysiloxane.

[0069] Preparation Example 6

[0070] The preparation of the hydrophilic polysiloxane polyurethane prepolymer in this example includes the following steps:

[0071] S1-1. According to the ratio of 100 parts of polyether modified isocyanate curing agent, 20 parts of amino-modified hydroxyl-terminated polysiloxane, and 10 parts of eugenol, the formulated amounts of polyether modified isocyanate curing agent, amino-modified hydroxyl-terminated polysiloxane, and eugenol are thoroughly mixed to obtain a reaction mixture.

[0072] S1-2. The reaction mixture is reacted at 75~80℃ for 3.5h to obtain a hydrophilic polysiloxane polyurethane prepolymer.

[0073] The polyether-modified isocyanate curing agent of Preparation Example 1 and the aminated hydroxyl-terminated polysiloxane of Preparation Example 3 were selected.

[0074] Preparation Example 7

[0075] The preparation of the hydrophilic polysiloxane polyurethane prepolymer in this example includes the following steps:

[0076] S1-1. According to the ratio of 100 parts of polyether modified isocyanate curing agent, 28 parts of amino-modified hydroxyl-terminated polysiloxane, and 14 parts of eugenol, the formulated amounts of polyether modified isocyanate curing agent, amino-modified hydroxyl-terminated polysiloxane, and eugenol are thoroughly mixed to obtain a reaction mixture.

[0077] S1-2. The reaction mixture is reacted at 75~80℃ for 3.5h to obtain a hydrophilic polysiloxane polyurethane prepolymer.

[0078] The polyether-modified isocyanate curing agent of Preparation Example 1 and the aminated hydroxyl-terminated polysiloxane of Preparation Example 3 were selected.

[0079] Preparation Example 8

[0080] The preparation of the hydrophilic polysiloxane polyurethane prepolymer in this example includes the following steps:

[0081] S1-1. According to the ratio of 100 parts of polyether modified isocyanate curing agent, 25.4 parts of amino-modified hydroxyl-terminated polysiloxane, and 12.8 parts of eugenol, the formulated amounts of polyether modified isocyanate curing agent, amino-modified hydroxyl-terminated polysiloxane, and eugenol are thoroughly mixed to obtain a reaction mixture.

[0082] S1-2. The reaction mixture is reacted at 75~80℃ for 3.5h to obtain a hydrophilic polysiloxane polyurethane prepolymer.

[0083] The polyether-modified isocyanate curing agent of Preparation Example 1 and the aminated hydroxyl-terminated polysiloxane of Preparation Example 3 were selected.

[0084] Preparation Example 9

[0085] The difference between this preparation example and preparation example 8 is that the polyether-modified isocyanate curing agent of preparation example 2 and the amino-modified hydroxyl-terminated polysiloxane of preparation example 4 are used.

[0086] Preparation Example 10

[0087] The difference between this preparation example and preparation example 8 is that the polyether-modified isocyanate curing agent of preparation example 2 and the amino-modified hydroxyl-terminated polysiloxane of preparation example 5 are used.

[0088] Preparation Example 11

[0089] The preparation of cinnamaldehyde-modified nano-titanium dioxide in this example includes the following steps:

[0090] S2-1. Weigh KH550 and fumed nano titanium dioxide precisely according to a mass ratio of 3.8:5.

[0091] S2-2. Dissolve KH550 in 50% ethanol solution to prepare a solution with a concentration of 1.5 g / L, heat to 60℃ and react for 45 min, then add gas phase nano titanium dioxide and sonicate for 30 min to obtain a reaction mixture.

[0092] S1-3. According to the addition ratio of 1g nano titanium dioxide to 55mL cinnamaldehyde, accurately weigh cinnamaldehyde and add it to the reaction mixture. Continue to sonicate for 60min, then stir for 36h. Filter out the solid product, wash it with alcohol, and dry it under vacuum at 45℃ to constant weight to obtain cinnamaldehyde-modified nano titanium dioxide.

[0093] The following are embodiments of this application.

[0094] The method for preparing polysiloxane-modified polyester fibers according to embodiments of this application includes the following steps:

[0095] S1. Select a specific hydrophilic polysiloxane polyurethane prepolymer;

[0096] S2. The cinnamaldehyde-modified nano-titanium dioxide prepared in Preparation Example 11 was selected.

[0097] S3. Weigh the raw materials according to the formula, mix them thoroughly to obtain a premix, add it to a twin-screw extruder, melt extrusion and granulation to obtain modified polyester masterbatch; the extrusion molding process parameters are as follows: the temperatures of the 6 temperature zones are 180℃, 185℃, 190℃, 195℃, 185℃ and 180℃ respectively.

[0098] S4. The modified polyester masterbatch obtained in step S3 is subjected to a hot melt spinning process to obtain polysiloxane modified polyester fiber, with a spinning temperature of 280~285℃.

[0099] The fiber size in the embodiments and comparative examples of this application is 75D monofilament.

[0100] Example 1

[0101] The mass ratio of each raw material component in the polysiloxane-modified polyester fiber of this embodiment includes: 100 parts of PET resin, 28 parts of hydrophilic polysiloxane polyurethane prepolymer, 8 parts of PE wax, 8 parts of cinnamaldehyde-modified nano titanium dioxide, and 0.2 parts of B225 composite antioxidant.

[0102] In this embodiment, the hydrophilic polysiloxane polyurethane prepolymer of Preparation Example 10 was selected.

[0103] Example 2

[0104] The mass ratio of each raw material component in the polysiloxane-modified polyester fiber of this embodiment includes: 100 parts of PET resin, 36 parts of hydrophilic polysiloxane polyurethane prepolymer, 12 parts of PE wax, 12 parts of cinnamaldehyde-modified nano titanium dioxide, and 0.5 parts of B225 composite antioxidant.

[0105] In this embodiment, the hydrophilic polysiloxane polyurethane prepolymer of Preparation Example 10 was selected.

[0106] Example 3

[0107] The mass ratio of each raw material component in the polysiloxane-modified polyester fiber of this embodiment includes: 100 parts of PET resin, 32 parts of hydrophilic polysiloxane polyurethane prepolymer, 9.6 parts of PE wax, 10 parts of cinnamaldehyde-modified nano titanium dioxide, and 0.4 parts of B225 composite antioxidant.

[0108] In this embodiment, the hydrophilic polysiloxane polyurethane prepolymer of Preparation Example 10 was selected.

[0109] Example 4

[0110] The mass ratio of each raw material component in the polysiloxane-modified polyester fiber of this embodiment includes: 100 parts of PET resin, 33 parts of hydrophilic polysiloxane polyurethane prepolymer, 10 parts of PE wax, 10.6 parts of cinnamaldehyde-modified nano titanium dioxide, and 0.42 parts of B225 composite antioxidant.

[0111] In this embodiment, the hydrophilic polysiloxane polyurethane prepolymer of Preparation Example 10 was selected.

[0112] Example 5

[0113] The difference between this embodiment and Example 4 is that this embodiment selects the hydrophilic polysiloxane polyurethane prepolymer of Preparation Example 7.

[0114] Example 6

[0115] The difference between this embodiment and Example 4 is that this embodiment selects the hydrophilic polysiloxane polyurethane prepolymer of Preparation Example 8.

[0116] Example 7

[0117] The difference between this embodiment and Example 4 is that this embodiment selects the hydrophilic polysiloxane polyurethane prepolymer of Preparation Example 9.

[0118] Example 8

[0119] The difference between this embodiment and Example 4 is that this embodiment selects the hydrophilic polysiloxane polyurethane prepolymer of Preparation Example 6.

[0120] Comparative Example 1

[0121] This application uses the iterative polyester fiber produced by Qingdao Xinwei Textile Development Co., Ltd. as comparative example 1.

[0122] Comparative Example 2

[0123] This application uses Silife antibacterial regenerated fiber produced by Qingdao Yousen Fiber Technology Co., Ltd. as comparative example 2.

[0124] Comparative Example 3

[0125] The difference between this comparative example and Example 8 is that no PE wax was added.

[0126] Comparative Example 4

[0127] The difference between this comparative example and Example 8 is that the polyether-modified isocyanate curing agent is replaced with Z4470 BA IPDI trimer curing agent with an equal amount of isocyanate groups.

[0128] The performance of the products from Examples 1-8 and Comparative Examples 1-4 was tested. The fibers from Examples 1-8 and Comparative Examples 1-4 were woven into satin fabrics with a sample size of 25cm × 25cm. The air permeability, moisture permeability, flexibility and antibacterial properties of the samples were tested respectively.

[0129] Among them, air permeability is tested by the method described in GB / T 5453-1997;

[0130] Moisture permeability was tested using the method described in GB / T 127041-2009.

[0131] The fiber's elongation at break was tested for flexibility according to the method described in GB / T 3923.1-2013.

[0132] The antibacterial properties were tested for the antibacterial rate of Staphylococcus aureus according to the agar plate diffusion method described in GB / T 20944.3-2008.

[0133] Then, abrasion aging tests were conducted on the satin fabrics of Examples 1-8 and Comparative Examples 1-4. After abrasion was performed 750 times on each side using a Martindale abrasion tester at a pressure of 12 kPa, the air permeability and moisture permeability were tested again.

[0134] The results are shown in Tables 1 and 2 below.

[0135]

[0136]

[0137] As can be seen from the data in Table 1, the products processed in Examples 1-8 of this application exhibit significantly better air permeability and moisture permeability compared to Comparative Example 1 and Comparative Example 2 of the prior art. The antibacterial properties of the products processed in Examples 1-8 of this application are significantly better than those of Comparative Example 1, and essentially equivalent to those of Comparative Example 2. Furthermore, the flexibility of the fibers in Examples 1-8 of this application is significantly better than that of Comparative Example 1 and Comparative Example 2. It is evident that this application, through modification using a dual polyurethane crosslinking network, combined with polysiloxane and polyether modification, and supplemented by a pore-forming process, enables the polyester fibers of this application to possess excellent flexibility. Simultaneously, after the aforementioned comprehensive modification, the polyester fibers of this application achieve excellent air permeability and moisture permeability. However, as can be seen from the data in Table 2, the products processed in Comparative Example 1 and Comparative Example 2 essentially lost their air permeability and moisture permeability after wear and aging, while the air permeability and moisture permeability of the products in Examples 1-8 of this application remained almost unchanged. It is evident that the polyester fiber of this application, after undergoing comprehensive modification specifically designed in this application, can achieve near-permanent functional retention.

[0138] The data in Table 1, comparing the data from Examples 1-8, shows that after optimizing the raw material ratio and the preparation parameters of the hydrophilic polysiloxane polyurethane prepolymer, the various properties of the fiber material can be further improved. Furthermore, in the aminated modified hydroxyl-terminated polysiloxane of this application, the higher the amino content, the better the material's various properties. Therefore, the effectiveness of this application mainly depends on factors such as the content of polyether-type polyurethane, the content of polysiloxane-type polyurethane, and the amino content of the polysiloxane. Appropriate and effective control of the content and ratio of the above substances and groups can enable the fibers of this application to obtain superior performance.

[0139] By comparing the data from Example 8 and Comparative Examples 3-4 in Table 1, it can be seen that without the use of a polyether-modified curing agent, the air permeability, moisture permeability, and flexibility of the polyester fiber are significantly reduced. Furthermore, without the use of PE wax for pore creation, the air permeability and moisture permeability of the polyester fiber also decrease significantly. This demonstrates that polyether modification not only imparts hydrophilicity to the polyester fiber but also effectively improves its toughness and flexibility. In addition, pore creation treatment of the fiber effectively increases its specific surface area, facilitating the contact between the internal modified polyurethane crosslinking network and the external environment, thereby significantly improving the material's air permeability and moisture permeability.

[0140] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A polysiloxane-modified polyester fiber, characterized by, The mass ratio of each raw material component in the polysiloxane-modified polyester fiber includes: 100 parts PET resin, 28-36 parts hydrophilic polysiloxane polyurethane prepolymer, 8-12 parts PE wax, 8-12 parts cinnamaldehyde-modified nano titanium dioxide, and 0.2-0.5 parts composite antioxidant; the mass ratio of each raw material component in the hydrophilic polysiloxane polyurethane prepolymer includes: 100 parts polyether-modified isocyanate curing agent, 20-28 parts amino-modified hydroxyl-terminated polysiloxane, and 10-14 parts eugenol; the PE wax is selected from products with a thermal decomposition temperature not exceeding 250℃. The method for preparing the polysiloxane-modified polyester fiber includes the following steps: S1. Preparation of hydrophilic polysiloxane polyurethane prepolymer; S2. Preparation of cinnamaldehyde-modified nano-titanium dioxide; S3. Weigh the raw materials according to the formula, mix them thoroughly to obtain a premix, add it to a twin-screw extruder, melt extrusion and granulation to obtain modified polyester masterbatch; S4. The modified polyester masterbatch obtained in step S3 is subjected to a hot melt spinning process to obtain polysiloxane modified polyester fiber, with a spinning temperature of 280~285℃.

2. The polysiloxane-modified polyester fiber according to claim 1, characterized by, The mass ratio of each raw material component in the polysiloxane modified polyester fiber includes: 100 parts PET resin, 32-33 parts hydrophilic polysiloxane polyurethane prepolymer, 9.6-10 parts PE wax, 10-10.6 parts cinnamaldehyde modified nano titanium dioxide, and 0.4-0.42 parts composite antioxidant.

3. The polysiloxane-modified polyester fiber according to claim 1, wherein The polyether-modified isocyanate curing agent is prepared by reacting polyether polyol and IPDI trimer curing agent in a molar ratio of hydroxyl to isocyanate group of 42~44:

100.

4. The polysiloxane-modified polyester fiber according to claim 3, characterized by, The preparation of the aminated modified hydroxyl-terminated polysiloxane includes the following steps: Sa, weigh N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane and hydroxyl-terminated polysiloxane precisely in a molar ratio of 1:1.4~1.8; Sb, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane was hydrolyzed with water, and then dried under vacuum at 40 degrees Celsius to obtain the hydrolysis product; Sc. The hydrolysis product is thoroughly mixed with the hydroxyl-terminated polysiloxane, and sodium hydroxide is added at 10% of the total mass of the mixture. The mixture is reacted at 75-80°C for 4.5 hours under nitrogen protection. Then, the mixture is heated to 175-180°C under a vacuum of 0.05-0.1 MPa to remove low molecular weight components. After cooling, the sodium hydroxide is filtered off to obtain the aminated modified hydroxyl-terminated polysiloxane.

5. The polysiloxane-modified polyester fiber according to claim 1, wherein The preparation of the hydrophilic polysiloxane polyurethane prepolymer includes the following steps: S1-1. Thoroughly mix the formulated amounts of polyether-modified isocyanate curing agent, amino-modified hydroxyl-terminated polysiloxane, and eugenol to obtain a reaction mixture; S1-2. The reaction mixture is reacted at 75~80℃ for 3.5h to obtain a hydrophilic polysiloxane polyurethane prepolymer.

6. The polysiloxane-modified polyester fiber according to claim 1, characterized in that, The preparation of the cinnamaldehyde-modified nano-titanium dioxide includes the following steps: S2-1. Weigh KH550 and fumed nano titanium dioxide precisely according to a mass ratio of 3.8:

5. S2-2. Dissolve KH550 in 50% ethanol solution to prepare a solution with a concentration of 1.5 g / L, heat to 60℃ and react for 45 min, then add gas phase nano titanium dioxide and sonicate for 30 min to obtain a reaction mixture. S1-3. According to the addition ratio of 1g nano titanium dioxide to 55mL cinnamaldehyde, accurately weigh cinnamaldehyde and add it to the reaction mixture. Continue to sonicate for 60min, then stir for 36h. Filter out the solid product, wash it with alcohol, and dry it under vacuum at 45℃ to constant weight to obtain cinnamaldehyde-modified nano titanium dioxide.

7. The polysiloxane-modified polyester fiber according to claim 1, wherein The composite antioxidant is antioxidant B225.

8. The polysiloxane-modified polyester fiber according to claim 1, wherein, In step S3, the extrusion molding process parameters are as follows: the temperatures of the six temperature zones are 175~180℃, 180~185℃, 185~190℃, 190~195℃, 185~190℃, and 180~185℃ respectively.

9. The application of the polysiloxane-modified polyester fiber according to any one of claims 1 to 8 in the field of automotive interior textile fabrics.

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