Modified polyester top and preparation method thereof, blended fabric

Abstract

The application relates to the field of wool spinning, and particularly discloses a modified polyester top, a preparation method thereof and a blended fabric, which comprises the following raw materials in parts by mass: PET resin 90-110 parts, CO2 response microgel modified porous filler 15-25 parts, silane coupling agent 1.5-3 parts and antioxidant 0.5-1.5 parts; the CO2 response microgel modified porous filler comprises one or more of CO2 response microgel modified porous silicon dioxide and CO2 response microgel modified diatomite. The modified polyester top disclosed by the application has good air permeability and uniform and firm dyeing.

Description

Technical Field

[0001] This application relates to the field of polyester tops, and more specifically, to a modified polyester top, a method for preparing the same, and blended fabrics. Background Technology

[0002] Polyester is a synthetic fiber obtained by spinning polyester, which is a polymer formed by the condensation of organic diacids and diols. It possesses high strength and stability. Polyester tops are an important textile raw material, mainly used in blends with wool tops to produce wool fabrics. By forming polyester into tops, adjusting crimp and cohesion, and modifying fiber arrangement, it becomes more suitable for wool blending systems. The resulting wool fabrics are low-cost and high-quality. Skipping the top stage and directly blending short fibers, such as polyester staple fiber + wool staple fiber, will lead to uneven dyeing and deterioration of yarn straightness.

[0003] By adding porous fillers, fabrics made from polyester tops can achieve good moisture absorption, heat retention, and breathability. The porous fillers create a nanoscale rough structure on the polyester surface. While this increases the adsorption sites for dyes, the air layer and hydroxyl groups within the pores hinder the diffusion of dye molecules into the fiber, resulting in uneven and weak adsorption. Furthermore, the dye accumulates on the surface of the porous layer, forming "shell dyeing," while the fiber itself is lightly colored. The dye is also easily shed during washing or rubbing, leading to poor dyeing uniformity and colorfastness.

[0004] Therefore, how to provide a modified polyester top that combines high breathability, dyeing uniformity, and color fastness, while also improving the aesthetics of the modified polyester top, is of great research value for expanding the high-end applications of polyester materials. Summary of the Invention

[0005] In order to make polyester tops have both high breathability, dyeing uniformity, and color fastness, this application provides a modified polyester top, its preparation method, and a blended fabric.

[0006] In a first aspect, this application provides a modified polyester tow, comprising the following raw materials in parts by weight: 90-110 parts of PET resin, 15-25 parts of CO2-responsive microgel modified porous filler, 1.5-3 parts of silane coupling agent, and 0.5-1.5 parts of antioxidant.

[0007] By employing the above technical solution, polyester resin is used as the main fiber skeleton to provide mechanical strength. The porous filler has numerous pores, providing ample air permeability channels for the top. A CO2-responsive microgel membrane is generated on the surface of the porous filler. This microgel swells or contracts depending on whether CO2 is introduced, adjusting the pore size distribution and pigment adsorption on the surface of the porous filler. This allows for better control over the dyeing effect of the resulting polyester top. Specifically, after CO2 is introduced or released, the osmotic pressure difference between the inside and outside of the gel causes the microgel membrane to swell or contract. After swelling, gas is released, and positively charged hydrophilic channels are formed to absorb sufficient anionic dyes. After contraction, a certain mass of dye is released, conducted to various locations on the fiber, and hydrophobically discharged, while excess dye is blocked. The membrane channels allow for sequential hydrophilic swelling to adsorb dye and hydrophobic contraction to block dye, achieving precise control over the dyeing of different areas of the fiber. The resulting top exhibits uniform dyeing and high color fastness. Furthermore, the contraction of the microgel membrane regulates the porosity, working synergistically with the porosity of the porous filler to improve air permeability. By adding a certain amount of silane coupling agent, the bonding between the organic and inorganic interfaces is further strengthened, the dispersion effect of the porous filler is improved, and the effect of uniform dyeing is facilitated.

[0008] In one specific feasible implementation, the preparation steps of CO2-responsive microgel-modified porous filler include: mixing porous filler and aminosilane coupling agent uniformly with ethanol aqueous solution, heating and reacting, and filtering to obtain aminated porous filler; then dispersing the aminated porous filler in cyclohexane containing Span 60 to obtain a mixture, adding acrylamide, N,N-bis(acryloyl)halogenated disulfide crosslinking agent N,N-dimethylformamide solution and water to acidified diethylaminoethyl methacrylate to obtain a reaction mixture, adding the mixture under nitrogen atmosphere for emulsification, adding potassium persulfate and heating for reaction, and post-treatment to obtain CO2-responsive microgel-modified porous filler.

[0009] The inventors combined conventional CO2-responsive microgel preparation technology with aminated porous fillers to generate a microgel film in situ on the filler surface. After amination, the porous filler surface can polymerize monomers such as acrylamide through hydrogen bonds and molecular entanglement, resulting in a uniform CO2-responsive microgel film on the porous silica surface. This film exhibits excellent CO2 response, can undergo repeated swelling and shrinkage, and provides better dye transfer. After protonation, the amino groups further enhance dye adsorption efficiency through electrostatic bonding, resulting in a more uniform color effect and high color fastness in the finished fabric. The presence of amino groups can also improve the dispersion of the porous filler in the resin through bonding with the carboxyl groups at the PET end, thus achieving uniform and firm dispersion of the porous filler in the fabric and better performing dyeing and breathability functions.

[0010] In one specific feasible implementation, the mass ratio of the aminated porous filler, diethylaminoethyl methacrylate, acrylamide, and N,N-bis(acryloyl)halogenamine disulfide crosslinking agent is (4.8-5.2):8:(0.6-0.8):(0.28-0.33).

[0011] By adopting the above technical solution, the microgel film layer on the surface of the CO2-responsive microgel modified porous filler has a suitable thickness. After hydrophilic swelling, it can expel gas and form hydrophilic channels to absorb sufficient dye. After hydrophobic shrinkage, it can release a certain amount of dye to achieve efficient and uniform dyeing. At the same time, the film layer will not affect the air permeability due to excessive thickness, complex pore structure and shrinkage difference, nor will it be too thin to achieve good air exhaust and dye "transfer" effect.

[0012] In one specific feasible implementation, the porous filler includes one or more of porous silica and diatomaceous earth.

[0013] And / or, the aminosilane coupling agent includes one or more of C2-4 alkyl-aminosilane coupling agents or C4-12 alkyl-aminosilane coupling agents.

[0014] By employing the above technical solution, CO2-responsive microgel-modified porous silica and CO2-responsive microgel-modified diatomaceous earth are used together, and aminosilane coupling agents with different carbon chain lengths are grafted onto them. After modification, the two not only can better bind tightly to the resin system, but also, due to the different lengths of the aminosilane chain segments grafted onto the surface of the porous filler, the modified surface of the porous filler exhibits different elasticities after the gel layer is formed on the surface of the porous filler, that is, differences in softness and hardness. This difference in softness and hardness allows the stress to be better transmitted during the swelling and shrinking process of the microgel, which is beneficial to the dyeing stability and thus achieves uniform dyeing.

[0015] In one specific implementation scheme, the CO2-responsive microgel-modified porous filler includes CO2-responsive microgel-modified porous filler I and CO2-responsive microgel-modified porous filler II in a mass ratio of 1:(0.9-1.1). In the preparation process of CO2-responsive microgel-modified porous filler I, the porous filler is porous silica and the aminosilane coupling agent is a C2-4 alkyl-aminosilane coupling agent. In the preparation process of CO2-responsive microgel-modified porous filler II, the porous filler is diatomaceous earth and the aminosilane coupling agent is a C5-12 alkyl-aminosilane coupling agent.

[0016] By employing the above technical solution, the combined use of diatomaceous earth and porous silica can leverage their respective properties of stable and high air permeability, thereby synergistically improving air permeability. Long-chain aminosilanes are grafted onto diatomaceous earth, and short-chain aminosilanes are grafted onto porous silica. On one hand, the bonding with PET allows for a rational distribution of CO2-responsive microgel-modified silica and CO2-responsive microgel-modified diatomaceous earth, enhancing the pore density and dyeing channels in the fabric strip, while simultaneously improving air permeability and dyeing performance. On the other hand, the different elasticities (i.e., the difference in hardness) between the two modified fillers enable better stress transmission and absorption, resulting in more stable dyeing effects and preventing uneven dyeing.

[0017] In one specific feasible implementation, the antioxidant is antioxidant 1010.

[0018] Secondly, this application provides a method for preparing modified polyester tops, comprising the following preparation steps:

[0019] S1: Blending and granulation: Weigh the raw materials for the preparation of the first aspect of the wool strip according to the mass, mix them evenly, knead them at 80-90℃ for 50-60 minutes, and then extrude and granulate them.

[0020] S2: Melt spinning: Melt at 260-280℃, spin through a spinneret, with a draw ratio of 3-4 times, followed by water cooling, filament cutting, crimping, combing, and carding.

[0021] In another embodiment, the preparation step further includes:

[0022] S3: CO2 responsive dyeing: The wool tops are introduced into the dye bath and CO2 and N2 are introduced sequentially, repeated ≥1 times. Then, they are washed with alkali solution and water sequentially, and dried to obtain modified polyester wool tops.

[0023] Understandably, the S3 step enables dyeing of polyester tops. During the spinning process, the CO2-responsive microgel-modified porous filler aligns better along the fiber axis to form breathable channels. The microgel achieves dye transfer and locking effects through repeated introduction of CO2 and N2 into the channels, thus optimizing the dyeing effect.

[0024] In one specific feasible implementation, the sequential introduction of CO2 and N2 into the dye bath includes the following steps: introducing CO2 to 0.3-0.5 MPa, heating to 75-85°C for swelling for 5-10 minutes, and then replacing with N2.

[0025] By adopting the above technical solution, the dyeing effect is good, the dye is evenly applied inside and outside the wool strip, and the color is firmly locked.

[0026] In one specific implementation, the dye bath comprises raw materials of the following mass concentrations: 0.1-10 wt% anionic dye, and the pH of the dye bath is buffered to 2.5-5.0 by an acetate-sodium acetate buffer.

[0027] Thirdly, this application provides a blended fabric, the raw materials of which include wool and the aforementioned modified polyester tops.

[0028] By adopting the above technical solution, the blending of wool and the modified polyester tops results in a suitable balance of crimp and cohesion, as well as fiber arrangement adjustment, making it suitable for wool blending processing systems. The resulting woolen fabric is low in cost and high in quality.

[0029] In summary, this application has the following beneficial effects:

[0030] This application adds a certain mass of CO2-responsive microgel modified porous filler to PET resin. Through the responsiveness of the microgel membrane to CO2, it hydrophilically swells to expel gas from the pores and absorbs dye, and hydrophobically shrinks to expel excess dye and perform cut-off dyeing. The resulting modified polyester tow has both high air permeability and color fastness, uniform dyeing, and high dye utilization.

[0031] This application controls the thickness of the microgel membrane by further limiting the proportion of raw materials and porous fillers used to prepare the gel layer, so that it can fully expel gas from the pores and absorb dye, cut off and enhance the uniform dyeing effect, and coordinate the breathability of the wool strip.

[0032] This application utilizes CO2-responsive microgel-modified porous silica and CO2-responsive microgel-modified diatomaceous earth together to further optimize air permeability and dyeing effect, resulting in modified polyester tops with more uniform and stable dyeing effect and air permeability. Detailed Implementation

[0033] To further aid in understanding the technical solution of this invention, several specific implementation examples are provided below to describe the technical solution of this invention in more detail. All of these described embodiments are only some embodiments of this invention, and not all of them.

[0034] The following specific embodiments can be combined with each other. The same or similar concepts or processes may not be described again in some embodiments. Unless otherwise specified, the reaction devices, monomer compounds and other materials involved in the following embodiments are commercially available.

[0035] Porous silica with a particle size of 200nm; diatomaceous earth with a mesh size of 2000; antioxidant is antioxidant 1010; PET resin is polyester chips, Shanghai Yuanfang CH-610; 3-aminopropyltrimethoxysilane CAS No. 13822-56-5; 8-(trimethoxysilyl)octylamine CAS No. 83943-64-0.

[0036] The following examples are further illustrations of the present invention, but the present invention is not limited thereto.

[0037] Preparation Example

[0038] Preparation Example 1: CO2-responsive microgel-modified porous silica:

[0039] 5g of porous silica and 0.5g of 3-aminopropyltrimethoxysilane were added to 150ml of 20wt% ethanol aqueous solution, dispersed evenly, and stirred at 60℃ for 2.5 hours. The mixture was then filtered, washed with water, and dried to obtain aminated porous silica. 5g of the aminated porous silica was then added to 100ml of cyclohexane (containing 0.5g Span60) to obtain a mixture for later use. 8g of diethylaminoethyl methacrylate was added to 20ml of 3mol / L dilute hydrochloric acid and stirred at 300rpm for 10min. Then, [the remaining mixture was added...] A reaction mixture was prepared by mixing 0.7 g acrylamide, 0.3 g N,N-bis(acryloyl)halamine disulfide crosslinking agent (pre-dissolved in 1 mL N,N-dimethylformamide), and 10 mL water. The mixture was heated to 40 °C and purged with nitrogen. The reaction mixture was then added dropwise to the mixture and stirred at 500 rpm for 20 min to emulsify. 0.1 g potassium persulfate was added, and the mixture was heated to 75 °C and reacted for 15 hours. The solid was collected by centrifugation, washed successively with acetone and water, and dried under vacuum to obtain CO2-responsive microgel-modified porous silica.

[0040] Preparation Example 2: CO2-responsive microgel-modified diatomaceous earth:

[0041] Add 5g of diatomaceous earth and 0.5g of 3-aminopropyltrimethoxysilane to 150ml of 20wt% ethanol aqueous solution, disperse evenly, stir at 60℃ for 2.5 hours, filter, wash with water, and dry to obtain aminated diatomaceous earth. Then take 5g of the above aminated diatomaceous earth and add it to 100ml of cyclohexane (containing 0.5g Span60) to obtain a mixture for later use. Add 8g of diethylaminoethyl methacrylate to 20ml of 3mol / L dilute hydrochloric acid and stir at 300rpm for 10min. Then add 0. A reaction mixture was prepared by mixing 7g acrylamide, 0.3g N,N-bis(acryloyl) methylamine disulfide crosslinking agent (pre-dissolved in 1mL N,N-dimethylformamide), and 10mL water. The mixture was heated to 40℃ and purged with nitrogen. The reaction mixture was then added dropwise to the mixture and stirred at 500rpm for 20min. 0.1g potassium persulfate was added, and the mixture was heated to 75℃ and reacted for 15 hours. The solid was collected by centrifugation, washed successively with acetone and water, and dried under vacuum to obtain CO2-responsive microgel-modified diatomaceous earth.

[0042] Preparation Example 3: CO2-responsive microgel-modified diatomaceous earth:

[0043] The difference between Preparation Example 3 and Preparation Example 2 is that 3-aminopropyltrimethoxysilane is replaced with 8-(trimethoxysilyl)octylamine.

[0044] Preparation Example 4: CO2-responsive microgel-modified diatomaceous earth:

[0045] The difference between Preparation Example 4 and Preparation Example 2 is that the amount of microgel reactant used was increased.

[0046] Add 5g of diatomaceous earth and 0.5g of 3-aminopropyltrimethoxysilane to 150ml of 20wt% ethanol aqueous solution, disperse evenly, stir at 60℃ for 2.5 hours, filter, wash with water, and dry to obtain aminated diatomaceous earth. Then take 5g of the above aminated diatomaceous earth and add it to 100ml of cyclohexane (containing 0.5g Span60) to obtain a mixture for later use. Add 9.6g of diethylaminoethyl methacrylate to 20ml of 3mol / L dilute hydrochloric acid and stir at 300rpm for 10min, then add 0. A reaction mixture was prepared by mixing 96g of acrylamide, 0.36g of N,N-bis(acryloyl)halamine disulfide crosslinking agent (pre-dissolved in 1mL of N,N-dimethylformamide), and 10mL of water. The mixture was heated to 40℃ and purged with nitrogen. The reaction mixture was then added dropwise to the mixture and stirred at 500rpm for 20min. 0.1g of potassium persulfate was added, and the mixture was heated to 75℃ and reacted for 15 hours. The solid was collected by centrifugation, washed successively with acetone and water, and dried under vacuum to obtain CO2-responsive microgel-modified diatomaceous earth.

[0047] Preparation Example 5: CO2-responsive microgel-modified diatomaceous earth:

[0048] The difference between Preparation Example 5 and Preparation Example 2 is that the amount of microgel reactant used was reduced.

[0049] Add 5g of diatomaceous earth and 0.5g of 3-aminopropyltrimethoxysilane to 150ml of 20wt% ethanol aqueous solution, disperse evenly, stir at 60℃ for 2.5 hours, filter, wash with water, and dry to obtain aminated diatomaceous earth. Then take 5g of the above aminated diatomaceous earth and add it to 100ml of cyclohexane (containing 0.5g Span60) to obtain a mixture for later use. Add 6.4g of diethylaminoethyl methacrylate to 20ml of 3mol / L dilute hydrochloric acid and stir at 300rpm for 10min, then add 0. A reaction mixture was prepared by mixing 56g of acrylamide, 0.24g of N,N-bis(acryloyl)halamine disulfide crosslinking agent (pre-dissolved in 1mL of N,N-dimethylformamide), and 10mL of water. The mixture was heated to 40℃ and purged with nitrogen. The reaction mixture was then added dropwise to the mixture and stirred at 500rpm for 20min. 0.1g of potassium persulfate was added, and the mixture was heated to 75℃ and reacted for 15 hours. The solid was collected by centrifugation, washed successively with acetone and water, and dried under vacuum to obtain CO2-responsive microgel-modified diatomaceous earth. Example Example 1

[0050] Raw material weighing: 1000g PET resin, 200g CO2-responsive microgel-modified porous silica prepared in Example 1, 20g γ-aminopropyltriethoxysilane, and 10g antioxidant.

[0051] S1: Blending and granulation: Mix the raw materials evenly by weight, knead at 80℃ for 55 minutes, and then granulate by extrusion.

[0052] S2: Melt spinning: Melt at 280℃, spin through a spinneret, draw ratio 3.5, water-cooled and set; the filament bundle is cut into 60mm short fibers by a cutter, hot air crimping at 120℃, packing box pressure 0.30MPa, sprayed with spinning oil, dried at 50℃, combined by 3 combs, 4.2 times draw, and combed to obtain the sliver;

[0053] S3: CO2 Response Dyeing: The wool tops are placed in the dye bath, and CO2 is introduced into the dye bath sequentially to 0.4 MPa. The mixture is heated to 80°C and swelled for 7 minutes. Then, N2 is used for replacement. This process is repeated 3 times. The wool tops are then washed sequentially with dilute alkali solution (5 wt% sodium hydroxide) and water, and dried to obtain modified polyester wool tops.

[0054] The dye bath ratio is 1:30. The dye solution includes the following raw materials at the following mass concentrations: Acid Orange 7 2.5wt%, sodium sulfate 5wt%, urea 0.5wt%, buffer solution and water. The pH of the dye solution is adjusted to 4.5 using an acetate-sodium acetate buffer solution, and the remainder is water. Example 2

[0055] The difference between Example 2 and Example 1 is that the filler is replaced by an equal amount of CO2-responsive microgel-modified diatomaceous earth prepared in Example 2 with the same amount of CO2-responsive microgel-modified porous silica prepared in Example 1. Example 3

[0056] The difference between Example 3 and Example 1 is that the filler is 100g of CO2-responsive microgel-modified porous silica prepared in Example 1 and 100g of CO2-responsive microgel-modified diatomaceous earth prepared in Example 2. Example 4

[0057] The difference between Example 4 and Example 1 is that the filler is 100g of CO2-responsive microgel-modified porous silica prepared in Example 1 and 100g of CO2-responsive microgel-modified diatomaceous earth prepared in Example 3. Example 5

[0058] The difference between Example 5 and Example 1 is that the filler is 100g of CO2-responsive microgel-modified porous silica prepared in Example 1 and 100g of CO2-responsive microgel-modified diatomaceous earth prepared in Example 4. Example 6

[0059] The difference between Example 6 and Example 1 is that the filler is 100g of CO2-responsive microgel-modified porous silica prepared in Example 1 and 100g of CO2-responsive microgel-modified diatomaceous earth prepared in Example 5. Example 7

[0060] The difference between Example 7 and Example 1 is that the filler is 120g of CO2-responsive microgel-modified porous silica prepared in Example 1 and 80g of CO2-responsive microgel-modified diatomaceous earth prepared in Example 3. Example 8

[0061] The difference between Example 8 and Example 1 is that the filler is 80g of CO2-responsive microgel-modified porous silica prepared in Example 1 and 120g of CO2-responsive microgel-modified diatomaceous earth prepared in Example 3. Comparative Example

[0062] Comparative Example 1

[0063] The difference between Comparative Example 1 and Example 1 is that the filler is 200g of porous silica.

[0064] Performance testing experiment

[0065] Fabrics made from ring-spun and plain-weave yarns of the samples obtained in the examples and comparative examples were subjected to the following tests:

[0066] Test 1: Breathability; Tested according to standard GB / T 5453-2025;

[0067] Test 2: Color fastness to washing: Tested according to standard GB / T 5713-2013;

[0068] Test 3: Evenness of color: The colorimeter measures the apparent color depth between different test sites of the same sample. Eight different test sites are randomly selected on each sample for measurement, and the standard deviation of the K / S value is calculated.

[0069] The test results are shown in Table 1.

[0070] Table 1

[0071] <![CDATA[Air permeability mL / (cm 2 *s)]]> Color fastness to washing Standard deviation of K / S value Example 1 22 4 0.39 Example 2 21 4 0.41 Example 3 25 5 0.28 Example 4 25 5 0.22 Example 5 23 5 0.29 Example 6 24 5 0.31 Example 7 24 5 0.25 Example 8 24 5 0.26 Comparative Example 1 20 3 1.01

[0072] In conjunction with Examples 1-2, Comparative Example 1, and Table 1, this application demonstrates that by adding a certain mass ratio of CO2-responsive microgel-modified porous filler to PET resin, the air permeability of the porous filler can be improved, as well as the color fastness to dyeing, the level dyeing effect, and the dyeing result can be enhanced. Further, in conjunction with Examples 1-3, it can be seen that the combined use of CO2-responsive microgel-modified porous silica and CO2-responsive microgel-modified diatomaceous earth as modified porous fillers in the preparation of felt tops can synergistically improve air permeability and dyeability, indicating that the two modified fillers in this application achieve synergistic effects in both air permeability and dyeing. Furthermore, referring to Examples 3 and 4, microgel-modified porous fillers with different elasticities (i.e., softness and hardness) are prepared by controlling the chain length of aminosilanes, which is beneficial for improving dyeing stability during the dyeing process and further optimizing the level dyeing effect.

[0073] As can be seen from Examples 3 and 5-6, adjusting the thickness of the microgel on the diatomaceous earth surface can optimize air permeability. Diatomaceous earth has natural porous air-permeable channels, and the appropriate thickness of the microgel on its surface in a contracted state helps to increase pore channels. If the microgel layer is too thin, the synergistic air permeability effect is slightly poor; if the microgel layer is too thick, it will lead to complex microgel pores and the shrinkage difference will affect the pores of the diatomaceous earth, thus affecting air permeability. As can be seen from Examples 4 and 7-8, adjusting the ratio of the two fillers can optimize the performance of the capillary.

[0074] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A modified polyester tow, characterized in that: The raw materials include the following parts by weight: 90-110 parts PET resin, 15-25 parts CO2-responsive microgel-modified porous filler, 1.5-3 parts silane coupling agent, and 0.5-1.5 parts antioxidant. The preparation steps of the CO2-responsive microgel-modified porous filler include: mixing the porous filler, aminosilane coupling agent, and ethanol aqueous solution evenly, heating and reacting, and filtering to obtain an aminated porous filler; then dispersing the aminated porous filler in cyclohexane containing Span 60 to obtain a mixture; adding acrylamide, N,N-bis(acryloyl)halogenated disulfide crosslinking agent, N,N-dimethylformamide solution, and water to acidified diethylaminoethyl methacrylate to obtain a reaction mixture; adding the mixture to the reaction mixture under nitrogen atmosphere for emulsification; adding potassium persulfate and heating to react; and post-treatment to obtain the CO2-responsive microgel-modified porous filler.

2. The modified polyester top according to claim 1, characterized in that: The mass ratio of the aminated porous filler, diethylaminoethyl methacrylate, acrylamide, and N,N-bis(acryloyl)halogenamine disulfide crosslinking agent is (4.8-5.2):8:(0.6-0.8):(0.28-0.33).

3. The modified polyester tow according to claim 1, characterized in that: The porous filler includes one or more of porous silica and diatomaceous earth, and / or the aminosilane coupling agent includes one or more of C2-4 alkyl-aminosilane coupling agents or C4-12 alkyl-aminosilane coupling agents.

4. The modified polyester tow according to claim 1, characterized in that: The CO2-responsive microgel-modified porous filler includes CO2-responsive microgel-modified porous filler I and CO2-responsive microgel-modified porous filler II in a mass ratio of 1:(0.9-1.1). In the preparation of CO2-responsive microgel-modified porous filler I: the porous filler is porous silica and the aminosilane coupling agent is a C2-4 alkyl-aminosilane coupling agent; in the preparation of CO2-responsive microgel-modified porous filler II: the porous filler is diatomaceous earth and the aminosilane coupling agent is a C5-12 alkyl-aminosilane coupling agent.

5. The modified polyester tow according to claim 1, characterized in that: The antioxidant is antioxidant 1010.

6. A method for preparing modified polyester top according to any one of claims 1-5, characterized in that: The preparation steps include: S1: Blending and granulation: Weigh the raw materials by mass, mix them evenly, and knead them at 80-90℃ for 50-60 minutes, then extrude and granulate; S2: Melt spinning: Melt at 260-280℃, spin through a spinneret, with a draw ratio of 3-4 times, water-cooled and shaped, cut into short filaments, crimped, combed and drawn to obtain a sliver.

7. The method for preparing a modified polyester tow according to claim 6, characterized in that: The preparation steps also include: S3: CO2-responsive dyeing: the wool tops are introduced into the dye bath and CO2 and N2 are introduced sequentially, repeated ≥1 times, and then washed with alkali solution and water sequentially, and dried to obtain modified polyester wool tops.

8. The method for preparing a modified polyester tow according to claim 7, characterized in that: The process of sequentially introducing CO2 and N2 into the dye bath includes the following steps: introducing CO2 to 0.3-0.5 MPa, heating to 75-85℃ for swelling for 5-10 minutes, and then replacing with N2; the dye bath includes raw materials with the following mass concentrations: 0.1-10 wt% anionic dye, and the pH of the dye bath is buffered to 2.5-5.0 by acetic acid-sodium acetate buffer.

9. A blended fabric, characterized in that: The raw materials include wool and the modified polyester tops as described in any one of claims 1-5, or the raw materials include wool and the modified polyester tops prepared by the preparation method as described in any one of claims 6-8.