Modified polyester fiber resistant to photo-thermal aging and application thereof

Abstract

The invention discloses a photo-thermal aging resistant modified polyester fiber and application thereof. On one hand, the invention provides the photo-thermal aging resistant modified polyester fiber, and the modified polyester fiber is prepared from the following raw material components in parts by mass: 100 parts of copolymerized modified PET (Polyethylene Terephthalate) resin, 24 to 32 parts of polysiloxane acrylate, 14 to 18 parts of a polyfunctional group acrylate monomer, 1.5 to 2 parts of a photoinitiator, 12 to 18 parts of conductive carbon black, 6 to 10 parts of a carbon nanotube and 0.24 to 0.54 part of a Tinuvin 144 light stabilizer; the copolymerized modified PET resin is 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol copolymerized modified PET resin, and the copolymerized modified PET resin is 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol copolymerized modified PET resin. On the other hand, the invention provides application of the photo-thermal aging resistant modified polyester fiber. The photothermal aging resistance is excellent, the hydrolysis resistance is excellent, certain hydrophilicity is achieved, and the contact comfort with the skin is good.

Description

Technical Field

[0001] This application relates to the field of automotive interior materials technology, and in particular to a modified polyester fiber resistant to photothermal aging and its applications. Background Technology

[0002] Polyester fiber, one of the world's three major synthetic fibers, is mainly composed of polyethylene terephthalate (PET). It boasts excellent physicochemical properties, high tensile strength, high elastic modulus, and low cost, making it widely used in automotive interior materials. In particular, most automotive surface materials, such as seat fabrics, carpets, and curtains, are made of polyester. In knitted and woven fabrics of automotive seat fabrics, polyester accounts for over 80%.

[0003] Polyester materials also have some drawbacks. Due to the lack of polar functional groups in its molecular chain, high crystallinity, and tight molecular arrangement, its hydrophilicity is poor, resulting in poor antistatic properties. Furthermore, polyester has insufficient resistance to photo- and heat aging. Prolonged exposure to external light, humidity, heat, and oxygen can easily lead to aging and stickiness, causing a significant decline in the fiber's physicochemical properties, yellowing, and surface cracking. The confined space inside a car, coupled with direct sunlight exposure during summer, causes a rapid increase in interior temperature. This enclosed, high-humidity, and high-temperature environment, combined with continuous sunlight exposure, easily accelerates the aging of polyester materials.

[0004] Current technologies generally address the aforementioned problems by modifying polyester materials with additives such as antioxidants and UV stabilizers. However, these improvements have limited effectiveness in practical applications. Therefore, developing polyester fibers with excellent resistance to photothermal aging is a pressing technical challenge in this field. Summary of the Invention

[0005] In order to solve at least one of the above-mentioned technical problems, and to develop a polyester material with excellent resistance to photothermal aging, excellent resistance to hydrolysis, certain hydrophilicity, and good comfort when in contact with the skin, this application provides a modified polyester fiber with resistance to photothermal aging and its application.

[0006] On one hand, this application provides a modified polyester fiber resistant to photothermal aging. The modified polyester fiber comprises the following components in the following mass ratios: 100 parts of copolymerized modified PET resin, 24-32 parts of polysiloxane acrylate, 14-18 parts of multifunctional acrylate monomer, 1.5-2 parts of photoinitiator, 12-18 parts of conductive carbon black, 6-10 parts of carbon nanotubes, and 0.24-0.54 parts of Tinuvin 144 light stabilizer; wherein the copolymerized modified PET resin is 2,2,4,4-tetramethyl-1,3-cyclobutanediol copolymerized modified PET resin.

[0007] Optionally, in the copolymerized modified PET resin, the molar ratio of ethylene glycol groups to 2,2,4,4-tetramethyl-1,3-cyclobutanediol groups is 11.5~12.5:1.

[0008] Optionally, the preparation of the copolymerized modified PET resin includes the following steps: S1-1. Weigh ethylene glycol and 2,2,4,4-tetramethyl-1,3-cyclobutanediol precisely according to the final molar ratio of the functional groups, and mix them to obtain a mixed alcohol. S1-2. According to the molar ratio of terephthalic acid to mixed alcohol of 1:1.2, accurately weigh terephthalic acid and add it to the mixed alcohol. Add antimony trioxide accounting for 0.25% of the total mass of terephthalic acid, mix thoroughly, and then transfer to the reaction vessel. S1-3. Under nitrogen protection, the temperature inside the reactor is raised to 230℃, the pressure inside the reactor is adjusted to 0.2~0.25MPa, and the reaction is carried out for 2.5h. Then, 0.08% of the total mass of terephthalic acid is added to the reactor to obtain a reaction mixture. S1-4. Maintain the temperature inside the reactor at 230 degrees Celsius and react for 45 minutes. Then adjust the pressure inside the reactor to 0.95~1MPa, raise the temperature inside the reactor to 250 degrees Celsius, and continue the reaction for 2 hours. Then raise the temperature inside the reactor to 270 degrees Celsius and continue stirring for 3 hours. Finally, discharge the material, slice it, and obtain the copolymerized modified PET resin.

[0009] Optionally, the polysiloxane acrylate is made of propoxylated glycerol triacrylate grafted silicone oil.

[0010] Optionally, the preparation of the polysiloxane acrylate includes the following steps: Sa, hydroxyl-terminated silicone oil and propoxylated glycerol triacrylate are mixed in a molar ratio of 1.05:2, and an isopropanol solution of chloroplatinic acid is added until the final concentration of chloroplatinic acid is 40 ppm. Then p-hydroxyanisole is added until the final concentration is 0.01%. After thorough mixing, the reaction solution is obtained. Sb. The mixture was heated to 90°C and stirred for 4.5 hours. Then, the volatile substances were removed by vacuum distillation at 85°C to obtain polysiloxane acrylate.

[0011] Optionally, the multifunctional acrylate monomer is a mixed monomer prepared from a difunctional acrylate monomer and a trifunctional acrylate monomer.

[0012] Optionally, the difunctional acrylate monomer is selected from polyethylene glycol diacrylate, and the trifunctional acrylate monomer is selected from ethoxylated trimethylolpropane triacrylate.

[0013] Optionally, the mass ratio of the difunctional acrylate monomer to the trifunctional acrylate is 1.8 to 2:1.

[0014] Optionally, the photoinitiator is selected from bifunctional A-hydroxy ketones.

[0015] On the other hand, this application provides the application of the above-mentioned photo- and heat-resistant modified polyester fibers in the field of automotive interior textile fabrics.

[0016] In summary, the present invention has at least one of the following beneficial technical effects: 1. This application uses a copolymer-modified PET resin obtained by copolymerizing ethylene glycol and 2,2,4,4-tetramethyl-1,3-cyclobutanediol with terephthalic acid as the main body, and incorporates a hydrophilic acrylate photocuring system containing organosilicon. After photocuring, a silane-containing acrylate crosslinking network can be formed in the resin. Through copolymer modification and the construction of the crosslinking network, the increased hardness caused by copolymer modification can be balanced by the elastic crosslinking network, so that the material still has good toughness. In addition, copolymer modification combined with the crosslinking network can also effectively improve the weather resistance of the material, and significantly improve the material's resistance to photothermal aging and hydrolysis.

[0017] 2. This application improves the aging resistance of the material by combining copolymerization modification with crosslinking modification, while giving the material a certain degree of hydrophilicity, which greatly enhances the comfort of contact with the skin.

[0018] 3. This application adds conductive carbon black and carbon nanotubes to the material system, which, combined with the hydrophilic properties brought about by the modification, can effectively improve the antistatic properties of the material. Detailed Implementation

[0019] The present application will be further described in detail below with reference to the embodiments.

[0020] This application provides a modified polyester fiber resistant to photo-thermal aging. The modified polyester fiber comprises the following components in the following mass ratios: 100 parts of copolymerized modified PET resin, 24-32 parts of polysiloxane acrylate, 14-18 parts of multifunctional acrylate monomer, 1.5-2 parts of photoinitiator, 12-18 parts of conductive carbon black, 6-10 parts of carbon nanotubes, and 0.24-0.54 parts of Tinuvin 144 light stabilizer; wherein the copolymerized modified PET resin is 2,2,4,4-tetramethyl-1,3-cyclobutanediol copolymerized modified PET resin.

[0021] The modified polyester fiber with photothermal aging resistance described above in this application can be prepared by the following method, including the following steps: S1. Preparation of copolymerized modified PET resin and polysiloxane acrylate; S2. Mix the formulated amounts of copolymerized modified PET resin, polysiloxane acrylate, multifunctional acrylate monomer and photoinitiator evenly, add to a twin-screw extruder, melt extrusion and granulation to obtain modified polyester masterbatch; the process parameters for extrusion granulation are as follows: the temperatures of the 6 temperature zones are 175℃, 185℃, 190℃, 195℃, 190℃ and 185℃ respectively. S3. The modified polyester masterbatch obtained in step S2 is cured with ultraviolet light for 15 minutes, then mixed with the remaining raw materials in the formula, added to a twin-screw extruder, melt extruded and granulated to obtain spinning masterbatch; the process parameters of extrusion granulation are as follows: the temperatures of the 6 temperature zones are 175℃, 180℃, 185℃, 195℃, 190℃ and 185℃ respectively. S5. The spinning masterbatch obtained in step S4 is subjected to a hot melt spinning process to obtain modified polyester fiber resistant to photo-heat aging.

[0022] The aforementioned modified polyester fibers with improved resistance to photothermal aging are mainly used in the field of automotive interior textile fabrics.

[0023] Prior to this application, existing technologies for preparing aging-resistant polyester materials typically involved incorporating antioxidants and UV stabilizers. However, such modifications did not improve the properties of the polyester material, and their practical effect was very limited. The applicant analyzed the causes of polyester material aging, finding that prolonged exposure to light and humid environments leads to hydrolysis and molecular chain breakage, resulting in a comprehensive decline in the overall performance of the material.

[0024] Through a well-designed process, the applicant first modified the properties of the polyester material via copolymerization. After copolymerization, 2,2,4,4-tetramethyl-1,3-cyclobutane glycol forms tetramethyl-substituted cyclobutane groups, effectively improving the material's heat resistance and toughness. Furthermore, this application designed a silane-containing acrylate crosslinking network. The monomers, rich in multifunctional groups, form an elastic crosslinking network after photocuring, mitigating the problem of significantly increased plasticity caused by copolymerization modification and effectively improving the material's toughness. Additionally, the cyclobutane groups after copolymerization, combined with the silane-containing acrylate crosslinking network, effectively enhance the material's hydrophilicity and water resistance, endowing it with the contradictory properties of hydrophilicity and water resistance, resulting in excellent hydrolysis resistance and superior resistance to heat and oxygen aging. With the addition of a specific UV stabilizer, the material's weather resistance far exceeds that of ordinary polyester fibers.

[0025] The following are preparation examples and embodiments of this application.

[0026] The main raw materials used in the embodiments of this application are all commercially available.

[0027] Among them, terephthalic acid, with a purity of over 99%, was purchased from Nantong Runfeng Petrochemical Co., Ltd.; ethylene glycol, with a purity of over 99%, was purchased from Wuhan Jixin Yibang Biotechnology Co., Ltd.; 2,2,4,4-tetramethyl-1,3-cyclobutanediol, with a purity of over 99%, was purchased from Shanghai Aladdin; hydroxyl-terminated silicone oil, with a purity of over 98%, was purchased from Wuhan Kemike Biomedical Technology Co., Ltd.; propoxylated glycerol triacrylate, with a purity of over 98%, was purchased from Wuhan Kemike Biomedical Technology Co., Ltd.; polyethylene glycol diacrylate, with a purity of over 99%, was purchased from Jingzhou Yinjie Chemical Co., Ltd.; ethoxylated trimethylolpropane triacrylate, with a purity of over 99%, was purchased from Hubei Zhonglong Kangcheng Fine Chemical Co., Ltd.; bifunctional A-hydroxy ketone, was purchased from Hubei Zhonglong Kangcheng Fine Chemical Co., Ltd.; conductive carbon black was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.; carbon nanotubes were purchased from Nanjing Xianfeng Nanomaterials Technology Co., Ltd.; Tinuvin 144 light stabilizer, purchased from Shenzhen Yoshida Chemical Co., Ltd.

[0028] The following is a preparation example of this application.

[0029] Preparation Example 1 The preparation of the copolymer-modified PET resin in this example includes the following steps: S1-1. Weigh ethylene glycol and 2,2,4,4-tetramethyl-1,3-cyclobutanediol precisely according to a molar ratio of 11:1, and mix them to obtain a mixed alcohol. S1-2. According to the molar ratio of terephthalic acid to mixed alcohol of 1:1.2, accurately weigh terephthalic acid and add it to the mixed alcohol. Add antimony trioxide accounting for 0.25% of the total mass of terephthalic acid, mix thoroughly, and then transfer to the reaction vessel. S1-3. Under nitrogen protection, the temperature inside the reactor is raised to 230℃, the pressure inside the reactor is adjusted to 0.2~0.25MPa, and the reaction is carried out for 2.5h. Then, 0.08% of the total mass of terephthalic acid is added to the reactor to obtain a reaction mixture. S1-4. Maintain the temperature inside the reactor at 230 degrees Celsius and react for 45 minutes. Then adjust the pressure inside the reactor to 0.95~1MPa, raise the temperature inside the reactor to 250 degrees Celsius, and continue the reaction for 2 hours. Then raise the temperature inside the reactor to 270 degrees Celsius and continue stirring for 3 hours. Finally, discharge the material, slice it, and obtain the copolymerized modified PET resin.

[0030] Preparation Example 2 The preparation of the copolymer-modified PET resin in this example includes the following steps: S1-1. Weigh ethylene glycol and 2,2,4,4-tetramethyl-1,3-cyclobutanediol precisely in a molar ratio of 11.5:1, and mix them to obtain a mixed alcohol. S1-2. According to the molar ratio of terephthalic acid to mixed alcohol of 1:1.2, accurately weigh terephthalic acid and add it to the mixed alcohol. Add antimony trioxide accounting for 0.25% of the total mass of terephthalic acid, mix thoroughly, and then transfer to the reaction vessel. S1-3. Under nitrogen protection, the temperature inside the reactor is raised to 230℃, the pressure inside the reactor is adjusted to 0.2~0.25MPa, and the reaction is carried out for 2.5h. Then, 0.08% of the total mass of terephthalic acid is added to the reactor to obtain a reaction mixture. S1-4. Maintain the temperature inside the reactor at 230 degrees Celsius and react for 45 minutes. Then adjust the pressure inside the reactor to 0.95~1MPa, raise the temperature inside the reactor to 250 degrees Celsius, and continue the reaction for 2 hours. Then raise the temperature inside the reactor to 270 degrees Celsius and continue stirring for 3 hours. Finally, discharge the material, slice it, and obtain the copolymerized modified PET resin.

[0031] Preparation Example 3 The preparation of the copolymer-modified PET resin in this example includes the following steps: S1-1. Weigh ethylene glycol and 2,2,4,4-tetramethyl-1,3-cyclobutanediol precisely in a molar ratio of 12.5:1, and mix them to obtain a mixed alcohol. S1-2. According to the molar ratio of terephthalic acid to mixed alcohol of 1:1.2, accurately weigh terephthalic acid and add it to the mixed alcohol. Add antimony trioxide accounting for 0.25% of the total mass of terephthalic acid, mix thoroughly, and then transfer to the reaction vessel. S1-3. Under nitrogen protection, the temperature inside the reactor is raised to 230℃, the pressure inside the reactor is adjusted to 0.2~0.25MPa, and the reaction is carried out for 2.5h. Then, 0.08% of the total mass of terephthalic acid is added to the reactor to obtain a reaction mixture. S1-4. Maintain the temperature inside the reactor at 230 degrees Celsius and react for 45 minutes. Then adjust the pressure inside the reactor to 0.95~1MPa, raise the temperature inside the reactor to 250 degrees Celsius, and continue the reaction for 2 hours. Then raise the temperature inside the reactor to 270 degrees Celsius and continue stirring for 3 hours. Finally, discharge the material, slice it, and obtain the copolymerized modified PET resin.

[0032] Preparation Example 4 The preparation of the copolymer-modified PET resin in this example includes the following steps: S1-1. Weigh ethylene glycol and 2,2,4,4-tetramethyl-1,3-cyclobutanediol precisely according to a molar ratio of 13:1, and mix them to obtain a mixed alcohol. S1-2. According to the molar ratio of terephthalic acid to mixed alcohol of 1:1.2, accurately weigh terephthalic acid and add it to the mixed alcohol. Add antimony trioxide accounting for 0.25% of the total mass of terephthalic acid, mix thoroughly, and then transfer to the reaction vessel. S1-3. Under nitrogen protection, the temperature inside the reactor is raised to 230℃, the pressure inside the reactor is adjusted to 0.2~0.25MPa, and the reaction is carried out for 2.5h. Then, 0.08% of the total mass of terephthalic acid is added to the reactor to obtain a reaction mixture. S1-4. Maintain the temperature inside the reactor at 230 degrees Celsius and react for 45 minutes. Then adjust the pressure inside the reactor to 0.95~1MPa, raise the temperature inside the reactor to 250 degrees Celsius, and continue the reaction for 2 hours. Then raise the temperature inside the reactor to 270 degrees Celsius and continue stirring for 3 hours. Finally, discharge the material, slice it, and obtain the copolymerized modified PET resin.

[0033] Preparation Example 5 The preparation of the polysiloxane acrylate in this example includes the following steps: Sa, hydroxyl-terminated silicone oil and ethoxylated trimethylolpropane triacrylate are mixed in a molar ratio of 1.05:2, and an isopropanol solution of chloroplatinic acid is added until the final concentration of chloroplatinic acid is 40 ppm. Then p-hydroxyanisole is added until the final concentration is 0.01%. After thorough mixing, the reaction solution is obtained. Sb. The mixture was heated to 90°C and stirred for 4.5 hours. Then, the volatile substances were removed by vacuum distillation at 85°C to obtain polysiloxane acrylate.

[0034] Preparation Example 6 The preparation of the polysiloxane acrylate in this example includes the following steps: Sa, hydroxyl-terminated silicone oil and propoxylated glycerol triacrylate are mixed in a molar ratio of 1.05:2, and an isopropanol solution of chloroplatinic acid is added until the final concentration of chloroplatinic acid is 40 ppm. Then p-hydroxyanisole is added until the final concentration is 0.01%. After thorough mixing, the reaction solution is obtained. Sb. The mixture was heated to 90°C and stirred for 4.5 hours. Then, the volatile substances were removed by vacuum distillation at 85°C to obtain polysiloxane acrylate.

[0035] The following are embodiments of this application.

[0036] The modified polyester fiber resistant to photothermal aging in this application embodiment is prepared by the following method, including the following steps: S1. Select specific copolymerized modified PET resin and polysiloxane acrylate; S2. Mix the formulated amounts of copolymerized modified PET resin, polysiloxane acrylate, multifunctional acrylate monomer and photoinitiator evenly, add to a twin-screw extruder, melt extrusion and granulation to obtain modified polyester masterbatch; the process parameters for extrusion granulation are as follows: the temperatures of the 6 temperature zones are 175℃, 185℃, 190℃, 195℃, 190℃ and 185℃ respectively. S3. The modified polyester masterbatch obtained in step S2 is cured with ultraviolet light for 15 minutes, then mixed with the remaining raw materials in the formula, added to a twin-screw extruder, melt extruded and granulated to obtain spinning masterbatch; the process parameters of extrusion granulation are as follows: the temperatures of the 6 temperature zones are 175℃, 180℃, 185℃, 195℃, 190℃ and 185℃ respectively. S5. The spinning masterbatch obtained in step S4 is subjected to a hot melt spinning process to obtain modified polyester fiber resistant to photo-heat aging.

[0037] The fiber size in the embodiments and comparative examples of this application is a single filament diameter of 0.8 mm.

[0038] Example 1

[0039] The mass ratio of each raw material component in the modified polyester fiber resistant to photothermal aging in this embodiment includes: 100 parts of copolymerized modified PET resin, 24 parts of polysiloxane acrylate, 14 parts of polyethylene glycol diacrylate, 1.5 parts of bifunctional A-hydroxy ketone, 12 parts of conductive carbon black, 6 parts of carbon nanotubes, and 0.24 parts of Tinuvin 144 light stabilizer.

[0040] In this embodiment, the copolymerized modified PET resin of Preparation Example 1 and the polysiloxane acrylate of Preparation Example 5 were selected.

[0041] Example 2

[0042] The mass ratio of each raw material component in the modified polyester fiber resistant to photothermal aging in this embodiment includes: 100 parts of copolymerized modified PET resin, 32 parts of polysiloxane acrylate, 18 parts of polyethylene glycol diacrylate, 2 parts of bifunctional A-hydroxy ketone, 18 parts of conductive carbon black, 10 parts of carbon nanotubes, and 0.54 parts of Tinuvin 144 light stabilizer.

[0043] In this embodiment, the copolymerized modified PET resin of Preparation Example 1 and the polysiloxane acrylate of Preparation Example 5 were selected.

[0044] Example 3

[0045] The modified polyester fiber for photothermal aging resistance in this embodiment has the following raw material components in the following mass proportions: 100 parts of copolymerized modified PET resin, 28.5 parts of polysiloxane acrylate, 16.4 parts of polyethylene glycol diacrylate, 1.8 parts of bifunctional A-hydroxy ketone, 15.6 parts of conductive carbon black, 8 parts of carbon nanotubes, and 0.42 parts of Tinuvin 144 light stabilizer.

[0046] In this embodiment, the copolymerized modified PET resin of Preparation Example 1 and the polysiloxane acrylate of Preparation Example 5 were selected.

[0047] Example 4

[0048] The modified polyester fiber for photo- and heat-resistant aging in this embodiment has the following raw material components in the following mass proportions: 100 parts of copolymerized modified PET resin, 28.5 parts of polysiloxane acrylate, 16.4 parts of multifunctional acrylate monomer, 1.8 parts of bifunctional A-hydroxy ketone, 15.6 parts of conductive carbon black, 8 parts of carbon nanotubes, and 0.42 parts of Tinuvin 144 light stabilizer; the multifunctional acrylate monomer is prepared by mixing polyethylene glycol diacrylate and ethoxylated trimethylolpropane triacrylate in a mass ratio of 1.5:1.

[0049] In this embodiment, the copolymerized modified PET resin of Preparation Example 1 and the polysiloxane acrylate of Preparation Example 5 were selected.

[0050] Example 5

[0051] The difference between this embodiment and Embodiment 4 is that the multifunctional acrylate monomer is prepared by mixing polyethylene glycol diacrylate and ethoxylated trimethylolpropane triacrylate in a mass ratio of 1.8:1.

[0052] Example 6

[0053] The difference between this embodiment and Embodiment 4 is that the multifunctional acrylate monomer is prepared by mixing polyethylene glycol diacrylate and ethoxylated trimethylolpropane triacrylate in a mass ratio of 2:1.

[0054] Example 7

[0055] The difference between this embodiment and Example 6 is that this embodiment uses the copolymerized modified PET resin of Preparation Example 1 and the polysiloxane acrylate of Preparation Example 6.

[0056] Example 8

[0057] The difference between this embodiment and Example 6 is that this embodiment uses the copolymerized modified PET resin of Preparation Example 2 and the polysiloxane acrylate of Preparation Example 6.

[0058] Example 9

[0059] The difference between this embodiment and Example 6 is that this embodiment selects the copolymerized modified PET resin of Preparation Example 3 and the polysiloxane acrylate of Preparation Example 6.

[0060] Example 10

[0061] The difference between this embodiment and Example 6 is that this embodiment uses the copolymerized modified PET resin of Preparation Example 4 and the polysiloxane acrylate of Preparation Example 6.

[0062] Comparative Example 1 The comparative polyester fiber raw material composition includes: 100 parts of copolymerized modified PET resin (Preparation Example 2), 8 parts of nano-titanium dioxide, and 0.5 parts of B225 antioxidant. Polyester masterbatch was prepared by mixing, hot melt extrusion, and granulation, and then polyester fiber was prepared by hot melt spinning.

[0063] Comparative Example 2 The difference between this comparative example and Example 9 is that an equal amount of copolymerized modified PET resin was used to replace polysiloxane acrylate, polyfunctional acrylate monomer and difunctional A-hydroxy ketone.

[0064] Comparative Example 3 The difference between this comparative example and Example 9 is that the copolymerized PET resin is replaced with an equal amount of PET resin.

[0065] Comparative Example 4 The difference between this comparative example and Example 9 is that an equal amount of polyurethane acrylate monomer is used to replace the multifunctional acrylate monomer.

[0066] The product performance of Examples 1-10 and Comparative Examples 1-4 was tested. The fibers of Examples 1-10 and Comparative Examples 1-4 were woven into plain weave fabrics with a sample size of 25cm×5cm. The strength of the samples was tested, and then the toughness and resistivity of the fibers were tested.

[0067] The strength was tested according to the method described in GB / T 3923.1-2013 for fracture strength. Toughness was tested according to the method described in GB / T 3923.1-2013, which determined the elongation at break. The resistivity was tested according to the method described in GB / T 14342-2015, and the fill factor was 0.23.

[0068] Then, the fibers of Examples 1-10 and Comparative Examples 1-4, as well as the woven plain fiber fabric, were subjected to aging treatment. After aging treatment, the product performance was tested again.

[0069] Aging parameters: 85℃ temperature, 100% humidity, UV intensity 0.45W / m 2 Under these conditions, the treatment lasted for 30 days.

[0070] The results are shown in Tables 1 and 2 below.

[0071]

[0072]

[0073] As can be seen from the data in Tables 1 and 2, the products of Examples 1-10 of this application exhibit significantly improved toughness and antistatic properties, as well as a markedly increased moisture absorption rate, compared to Comparative Example 1. This demonstrates that the modified polyester fiber of this application, resistant to photothermal aging, possesses excellent toughness and antistatic properties, along with good hydrophilicity and skin affinity. Furthermore, the products of Examples 1-10 of this application show significantly improved aging resistance compared to Comparative Example 1; after UV light and damp heat treatment, the properties of the products of Examples 1-10 remain almost unchanged, while the properties of the product of Comparative Example 1 show a significant decline. This indicates that the use of copolymerization and specific crosslinking modification in this application significantly improves the photothermal aging resistance and hydrolysis resistance of the polyester material, resulting in a substantial enhancement of material durability.

[0074] Comparing the data from Examples 1-10 in Tables 1 and 2, it can be seen that the performance of the products from Examples 8-9 is significantly better than that of the products from Examples 7 and 10, while the performance of the products from Examples 7-10 is significantly better than that of the products from Examples 1-6. This demonstrates that the optimized raw material ratio significantly improves the various properties of the fiber material. Furthermore, when the molar ratio of ethylene glycol to 2,2,4,4-tetramethyl-1,3-cyclobutanediol is controlled at 11.5-12.5:1, the performance of the fiber material is relatively optimal. The applicant believes that the amount of 2,2,4,4-tetramethyl-1,3-cyclobutanediol introduced into the copolymerized PET resin has a significant impact on the performance of the fiber material. Excessive or insufficient introduction will lead to a decrease in material performance; excessive introduction will result in excessive rigidity and significantly reduced toughness, while insufficient introduction will affect the aging resistance of the fiber material. Furthermore, in the system described in this application, polysiloxane acrylate is prepared using hydroxyl-terminated silicone oil and propoxylated glycerol triacrylate, and a photocuring system composed of polyethylene glycol diacrylate and ethoxylated trimethylolpropane triacrylate in a specific ratio can effectively enhance the various properties of the fiber material. The applicant believes that the above-mentioned photocuring system can enable the fiber material to obtain optimal toughness, hydrophilicity, and aging resistance, thereby effectively improving the overall performance of the fiber material.

[0075] By comparing the data in Tables 1 and 2, specifically Example 9 and Comparative Examples 2-4, it can be seen that the use of a specific copolymerized modified PET resin in conjunction with the construction of a silane-containing acrylate crosslinking network is key to the excellent anti-aging properties of the fiber material and also crucial for achieving optimal overall performance. A single improvement method cannot achieve these effects. Furthermore, the use of specific multifunctional acrylate monomers in this application enables the cured acrylate to achieve optimal toughness and hydrophilicity. Using other acrylate monomers would significantly reduce the various properties of the fiber material.

[0076] 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 modified polyester fiber resistant to photo-thermal aging, characterized in that, The modified polyester fiber comprises the following components in the following mass ratios: 100 parts of copolymerized modified PET resin, 24-32 parts of polysiloxane acrylate, 14-18 parts of polyfunctional acrylate monomer, 1.5-2 parts of photoinitiator, 12-18 parts of conductive carbon black, 6-10 parts of carbon nanotubes, and 0.24-0.54 parts of Tinuvin 144 light stabilizer; wherein the copolymerized modified PET resin is 2,2,4,4-tetramethyl-1,3-cyclobutanediol copolymerized modified PET resin.

2. The modified polyester fiber resistant to photothermal aging according to claim 1, characterized in that, In the copolymerized modified PET resin, the molar ratio of ethylene glycol groups to 2,2,4,4-tetramethyl-1,3-cyclobutanediol groups is 11.5~12.5:

1.

3. The modified polyester fiber resistant to photo-thermal aging according to claim 1, characterized in that, The preparation of the copolymerized modified PET resin includes the following steps: S1-1. Weigh ethylene glycol and 2,2,4,4-tetramethyl-1,3-cyclobutanediol precisely according to the final molar ratio of the functional groups, and mix them to obtain a mixed alcohol. S1-2. According to the molar ratio of terephthalic acid to mixed alcohol of 1:1.2, accurately weigh terephthalic acid and add it to the mixed alcohol. Add antimony trioxide accounting for 0.25% of the total mass of terephthalic acid, mix thoroughly, and then transfer to the reaction vessel. S1-3. Under nitrogen protection, the temperature inside the reactor is raised to 230℃, the pressure inside the reactor is adjusted to 0.2~0.25MPa, and the reaction is carried out for 2.5h. Then, 0.08% of the total mass of terephthalic acid is added to the reactor to obtain a reaction mixture. S1-4. Maintain the temperature inside the reactor at 230 degrees Celsius and react for 45 minutes. Then adjust the pressure inside the reactor to 0.95~1MPa, raise the temperature inside the reactor to 250 degrees Celsius, and continue the reaction for 2 hours. Then raise the temperature inside the reactor to 270 degrees Celsius and continue stirring for 3 hours. Finally, discharge the material, slice it, and obtain the copolymerized modified PET resin.

4. The modified polyester fiber resistant to photothermal aging according to claim 1, characterized in that, The polysiloxane acrylate is made of propoxylated glycerol triacrylate grafted with silicone oil.

5. The modified polyester fiber resistant to photothermal aging according to claim 4, characterized in that, The preparation of the polysiloxane acrylate includes the following steps: Sa, hydroxyl-terminated silicone oil and propoxylated glycerol triacrylate are mixed in a molar ratio of 1.05:2, and an isopropanol solution of chloroplatinic acid is added until the final concentration of chloroplatinic acid is 40 ppm. Then p-hydroxyanisole is added until the final concentration is 0.01%. After thorough mixing, the reaction solution is obtained. Sb. The mixture was heated to 90°C and stirred for 4.5 hours. Then, the volatile substances were removed by vacuum distillation at 85°C to obtain polysiloxane acrylate.

6. The modified polyester fiber resistant to photothermal aging according to claim 1, characterized in that, The multifunctional acrylate monomer is a mixed monomer prepared from difunctional and trifunctional acrylate monomers.

7. The modified polyester fiber resistant to photothermal aging according to claim 6, characterized in that, The difunctional acrylate monomer is selected from polyethylene glycol diacrylate, and the trifunctional acrylate monomer is selected from ethoxylated trimethylolpropane triacrylate.

8. The modified polyester fiber resistant to photothermal aging according to claim 7, characterized in that, The mass ratio of the difunctional acrylate monomer to the trifunctional acrylate is 1.8~2:

1.

9. The modified polyester fiber resistant to photothermal aging according to claim 1, characterized in that, The photoinitiator is selected from bifunctional A-hydroxy ketones.

10. The application of a modified polyester fiber with photothermal aging resistance as described in any one of claims 1 to 9 in the field of automotive interior textile fabrics.

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