Hair-feeling polyester fiber and preparation method thereof

Abstract

The invention belongs to the field of functional fiber materials. The invention relates to a wool-feeling polyester fiber and a preparation method thereof. The wool-feeling polyester fiber is prepared from the following raw materials in parts by weight: 100 parts of PET (Polyethylene Terephthalate) slices, 15.0-25.0 parts of a wool-feeling aid, 0.2-1.0 part of an antioxidant, 0.1-0.3 part of a lubricant and 0.5-1.5 parts of a fiber treating agent, the preparation method comprises the following steps: drying the raw materials, and mixing; performing melt extrusion and pressurization; performing spinning; post-processing is conducted; curling, loosening and shaping; and cutting off the tows, and packaging. The wool-feeling polyester fiber is of a hollow structure, the problems that in the prior art, polyester fibers are hard and poor in heat preservation effect can be effectively solved, and meanwhile the wool-feeling polyester fiber has the excellent antibacterial property.

Description

Technical Field

[0001] The invention relates to a wooly polyester fiber and a preparation method thereof. The invention belongs to the field of functional fiber materials. Background Art

[0002] Natural animal fibers have many properties such as anti-static, warmth, breathability, moisture permeability, smoothness, and no aurora, and are deeply loved by people. However, they are affected by factors such as limited raw material sources, high cost, easy insect damage and deformation, and difficulty in yarn formation, which limit their widespread application. Therefore, it is particularly important to develop chemical fibers that imitate animal fibers, have good spinnability and a wooly feel to replace natural animal fibers.

[0003] The so-called wooly chemical fiber generally refers to a fiber that is soft and smooth in appearance, and also has the characteristics of warmth retention, softness, breathability and moisture permeability of animal fibers. Although conventional wool-like polyester fibers have a wool-like effect in feel and appearance after modification, they still cannot get rid of the disadvantage of polyester fibers being uncomfortable to wear. Of course, there are two main ways to improve the comfort of polyester fibers: the first method is to improve the hydrophilicity and drainage properties of the polyester surface through surface treatment of polyester to increase comfort, but this method is complicated and easily affected by the use environment, and the effect is unstable and not lasting; the second method is to improve the comfort properties of polyester materials by physical blending through the co-spinning of modified components. This method has a better modification effect, but it is easy to mix unevenly, affecting the mechanical properties of polyester materials, and the mechanical properties and long-term use will be affected. The above commonly used modification methods still do not solve the problem that the hardness of polyester fiber itself affects the comfort; in addition, the thermal conductivity of polyester fiber is about 0.084W / (m·K), which is much higher than animal fibers such as wool (0.052-0.055W / (m·K)), silk (0.050-0.055W / (m·℃)) and down (0.024W / (m·K)), so research on improving the thermal insulation performance of polyester fiber is also urgent. Summary of the invention

[0004] The purpose of the present invention is to provide a wooly polyester fiber and a preparation method thereof in view of the problem that polyester fibers in the prior art are hard and have poor heat preservation effects. The wooly polyester fiber is prepared by molecular design and added to PET slices through formula design, and then melt extrusion, spinning, pulling, shaping and other processes are carried out to effectively solve the above problems and also have excellent antibacterial effects. The technical solution adopted by the present invention to solve the technical problems is: The present invention provides a wooly polyester fiber, comprising the following raw materials in parts by weight: PET slices 100 pieces; 15.0-25.0 parts of hair feeling additive; Antioxidant 0.2-1.0 part; Lubricant 0.1-0.3 parts; Fiber treatment agent 0.5-1.5 parts; The hair feeling auxiliary agent and its preparation method include the following steps: S11, performing a silylation coupling reaction on the aerogel and an acryloxysilane coupling agent to obtain an intermediate product I; The usage ratio of the aerogel to the acryloxysilane coupling agent is 1g:0.1-0.3g; S12, subjecting the amino acid to polycondensation reaction to obtain an intermediate product II; S13, adding the intermediate product I to the intermediate product II to carry out Michael addition reaction to obtain an intermediate product III; The intermediate product I and the intermediate product II are added in a molar ratio of acryloyloxy to terminal amino group of 1:1; S14, subjecting the dibasic acid and the diol to a condensation polymerization reaction to obtain an intermediate product IV; The molar ratio of the dibasic acid to the diol is 1:1; S15, adding the intermediate product III to the intermediate product IV for esterification reaction to obtain the target product, i.e., the hair feel additive; The intermediate product III and the intermediate product IV are added at a molar ratio of carboxyl to hydroxyl of 1:1.

[0005] Furthermore, the amino acid is an amino acid containing a side group.

[0006] Further, The amino acid containing a side group is one or more of glycine, lysine, arginine, histidine or tryptophan.

[0007] Further, The dibasic acid is a fatty acid and an aromatic acid added in a molar ratio of 0.3-0.5:0.5-0.7; as well as The diols are small molecule dihydric fatty alcohols, polyether diols, and polyester diols, which are added in a molar ratio of 0.75-0.8:0.1-0.2:0.05-0.10.

[0008] Further, the number of carbon atoms in the fatty acid is C4-C10; The two carboxyl groups in the aromatic acid are in a non-para-position structure; The number of carbon atoms in the small molecule dihydric fatty alcohol is C4-C8; The molecular weight of the polyether diol is 200-1000; and The molecular weight of the polyester diol is 500-1000.

[0009] Further, the average degree of polymerization of the intermediate product II is 18-30; and The average degree of polymerization of the intermediate product IV is 8-15.

[0010] Furthermore, the intrinsic viscosity of the PET chips ranges from 0.65 to 0.90 dL / g, and the melting point is 245 to 255°C.

[0011] Another object of the present invention is to provide a method for preparing wooly polyester fiber, comprising the following steps: S21: drying and mixing of raw materials; S22: melt extrusion, pressurization; S23: spinning to obtain nascent fibers; S24: post-processing, i.e., drawing and heat setting; S25: Curly, loose styling; S26: The tow is cut and packaged to obtain wooly polyester fibers.

[0012] Further, For the melt extrusion, the temperature of each zone of the twin-screw extruder is: 250-260°C in zone 1, 260-270°C in zone 2, 270-275°C in zone 3, 275-280°C in zone 4, and 275-280°C in zone 5; The spinning is to use double C-type spinnerets to spray out the filament bundle; the double C-type spinnerets are two C-type spinnerets connected to each other and arranged symmetrically, and their C-type hole grooves are arranged outwardly and back to back.

[0013] Beneficial effects of the present invention: (1) The present invention provides a wooly polyester fiber, which is added with a homemade wooly additive. The fiber is a hyperbranched structure with a silicon aerogel as the core, a polyamino acid as the middle layer, and a polyester structure as the outer layer. The polyamino acid is polymerized from amino acids containing a side group structure; the polyester structure is copolymerized from multiple side group structural units and a polyether structure. First, the wooly additive is a hyperbranched structure, which has a lower molecular weight and a higher degree of branching than the chemical structure of the PET structure, and can effectively reduce the glass transition temperature of the polyester fiber and improve the softness of the fiber; and the hyperbranched, side group structure, and flexible chain structural units can form a highly curled shape after heat treatment, further improving the softness of the hand feel; second, the polyester structure of the outer layer has excellent compatibility with the main PET, and has a good dispersion effect, which can avoid the phenomenon of uneven strength; third, the core silicon aerogel is a porous structure, which can increase the fiber cavity and store static air, and has Extremely low thermal conductivity, excellent warmth retention effect; Fourth, the polyamino acid structure of the middle layer is polymerized from one or more amino acids, has certain hygroscopicity and breathability, etc., and can provide a fluffy feel similar to natural fibers; Fifth, the polyamino acid structure is an amino acid structural unit, with excellent broad-spectrum antibacterial effect; Sixth, during the melt extrusion process, accompanied by the esterification polymerization and depolymerization of the PET polyester structure, the end of the functional additive is a carboxyl structure, which can react and bond to the PET structure, slowing down material degradation and improving processability; At the same time, it has long-lasting internal toughening, warmth retention, antibacterial and other functions.

[0014] (2) The present invention provides a method for preparing wooly polyester fibers, which are prepared by a double C-type spinneret spinning process. Due to the extrusion expansion effect, the two "C" characters are smoothly closed and adhered to form a parallel hollow fiber with two cavities in the cross section. First, the double C-type spinneret spinning process can make the fiber have better water absorption, improve the soft feel of the fiber, and achieve a wool-like effect; second, the hollow structure fiber prepared by the double C-type spinneret spinning process can further improve the warmth effect; in addition, it can also improve the soft touch, reduce the fiber weight, and ultimately improve the wool effect. DETAILED DESCRIPTION

[0015] The present invention is described in detail below with reference to the examples. However, it should be understood that the following examples are only illustrative of the embodiments of the present invention, and are not intended to limit the scope of the present invention.

[0016] The purpose of the present invention is to develop a wooly polyester fiber to solve the problem that polyester fiber is hard and has poor thermal insulation effect. The design idea is: two problems need to be solved. First, solve the problem of hardness: think of the structure of animal fiber as a protein (polyamino acid) structure, which has excellent air permeability, moisture permeability and antistatic function; therefore, a wooly auxiliary agent for polyester can be developed, which is a polyamino acid structure. This structure can also destroy the crystallinity of polyester and lower the melting point, thereby improving softness, comfort, etc.; through the hyperbranched structure, more branches are used to improve the softness of polyester fiber to further solve the problem of hardness. Second, for the problem of poor thermal insulation effect: considering the low thermal conductivity, aerogel is one of the best choices at present. Aerogel can be used as an auxiliary agent, and combined with the above-mentioned wooly auxiliary agent, aerogel is used as the branching center point of the hyperbranched structure of the wooly auxiliary agent, and at the same time, the effective dispersion of aerogel can be promoted. The above two problems can be effectively solved; however, the hair feeling additive has aerogel as the core and polyamino acid as the branched chain, and there is a compatibility problem with the polyester matrix. Therefore, further molecular design is carried out, and a synthetic polyester structure is designed in the outer layer of polyamino acid to form a hyperbranched structure with aerogel as the core, polyamino acid as the middle layer, and polyester structure as the outermost layer. At the same time, the polyamino acid and polyester structure molecules are highly designable, such as using flexible chain raw materials, raw materials with certain side group structures, etc., and polyamino acid also has excellent antibacterial effect. The theoretical basis for the realization is: first, aerogel is subjected to acryloxy coupling reaction; then amino acid is subjected to self-polymerization reaction of low molecular weight amide; then the terminal amino group of polyamino acid and the acryloxy of aerogel are subjected to Michael addition reaction; the next step is to prepare a low molecular weight polyester structure by esterification reaction with dibasic acid diol; finally, the polyurethane-embedded aerogel is subjected to esterification reaction with the low molecular weight polyester structure to obtain the target hyperbranched structure product. After formula design, the above self-made ingredients are added to the raw material components for blending and extrusion; at the same time, the spinning process is taken into consideration, and the hollow structure fiber prepared by the double C-type spinneret spinning process is further improved in terms of thermal insulation performance and softness, and wooliness. The embodiments of the present invention are as follows: The embodiment of the present invention provides a wooly polyester fiber, comprising the following raw materials in parts by weight: PET slices 100 pieces; 15.0-25.0 parts of hair feeling additive; Antioxidant 0.2-1.0 part; Lubricant 0.1-0.3 parts; Fiber treatment agent 0.5-1.5 parts; The hair feeling auxiliary agent and its preparation method include the following steps: S11, adding aerogel and deionized water A to anhydrous ethanol, ultrasonically dispersing for 1 hour, adding glacial acetic acid to adjust the pH value to 3.5-5.5, adding acryloxysilane coupling agent, stirring and ultrasonicating for 0.5 hour, heating to 50-60°C and reflux for 8-12 hours; after the reaction is completed, filtering, taking insoluble matter, rinsing with deionized water B, vacuum drying at 40°C to constant weight, grinding, and obtaining intermediate product I.

[0017] The usage ratio of the aerogel, deionized water A, anhydrous ethanol, acryloxysilane coupling agent, and deionized water B is 1g: 2g: 18g: 0.1-0.3g: 30g; The aerogel is a silicon aerogel with an average particle size of 10-50 μm. In addition, the aerogel in the following embodiments of the present invention has a particle size of 15 μm and is purchased from Suzhou Thermal Image Nanotechnology Co., Ltd., model TEP-D20.

[0018] The acryloxysilane coupling agent may be silane coupling agent KH570, silane coupling agent KH571, silane coupling agent KH670, etc., and preferably silane coupling agent KH570.

[0019] S12, N2 protection, add amino acid, p-toluenesulfonic acid, DCC and NHS to anhydrous N,N-dimethylformamide, ice bath for 1 hour, remove the ice bath, continue stirring, determine the water content in the reaction system by gas chromatography and calculate the dehydration mass; filter, take the organic phase, distill under reduced pressure, and vacuum dry at 60°C for 6 hours to obtain intermediate II.

[0020] The amino acid is an amino acid containing a side group; The amino acid containing a side group is one or more of glycine, lysine, arginine, histidine or tryptophan; and, preferably, the amino acid containing a side group in the following embodiments of the present invention is glycine, lysine, arginine, histidine, tryptophan added in a molar ratio of 0-0.1: 0-0.1: 0.5-0.7: 0-0.1: 0.2-0.4; The amount of p-toluenesulfonic acid used is 1.0wt% of the total weight of amino acids; The usage ratio of the amino acid, DCC, NHS and N,N-dimethylformamide is 1 mol: 1 mol: 0.5 mol: 400 mL.

[0021] The average polymerization degree of the intermediate product II is 18-30; since the amidation polymerization of amino acids belongs to a dehydration condensation reaction, the molecular weight and polymerization degree of the polyamino acid can be rationally controlled by the quality of the separated water. In addition, since the reaction activity of amino acids decreases with the increase of the molecular weight of the self-polymerization, when the average polymerization degree is less than 18, the molecular weight is low, the degree of flexibility is not high, and the wool feeling is not good; when the average polymerization degree is greater than 30, the molecular chain is longer, the reaction activity is reduced, and it is not conducive to the subsequent esterification reaction.

[0022] S13, adding intermediate product I and intermediate product II to N,N-dimethylformamide, stirring at room temperature for 4-8 hours, distilling under reduced pressure, and vacuum drying at 40° C. for 8 hours to obtain intermediate product III.

[0023] The intermediate product I and the intermediate product II are added in a molar ratio of acryloyloxy to terminal amino group of 1:1; The usage ratio of the intermediate product I to N,N-dimethylformamide is 1 g:50 mL.

[0024] S14, N2 protection, add dibasic acid, diol and tetrabutyl titanate into xylene, stir and heat to reflux, calculate the mass of water separated as the reaction end point; obtain a solution containing intermediate product IV.

[0025] The usage ratio of the dibasic acid, diol and xylene is 0.1 mol: 0.1 mol: 100 mL.

[0026] The dibasic acid is a fatty acid and an aromatic acid added in a molar ratio of 0.3-0.5:0.5-0.7; The diols are small molecule dihydric fatty alcohols, polyether diols, and polyester diols, which are added in a molar ratio of 0.75-0.8:0.1-0.2:0.05-0.10.

[0027] The number of carbon atoms of the fatty acid is C4-C10; specifically, it can be succinic acid, 2-methylsuccinic acid, 2,2-dimethylsuccinic acid, 3-methyl-3-ethylglutaric acid, 2-butylsuccinic acid, adipic acid, 3-methyladipic acid, 3-tert-butyladipic acid, sebacic acid, etc.

[0028] The two carboxyl groups in the aromatic acid are non-parametric structures; specifically, they may be phthalic acid, isophthalic acid, 1-methyl-3,5-phthalic acid or 4-ethylbenzene-1,3-dicarboxylic acid, etc.; The number of carbon atoms of the small molecule divalent fatty alcohol is C4-C8; specifically, it may be 1,3-butanediol, 2,4-pentanediol, 1,3-pentanediol, 1,4-pentanediol, octanediol, etc.; The polyether diol may be PEG-200, PEG-400, PEG-600, PEG-700, PEG-1000, or a mixture thereof; and, the polyether diol in the following embodiments of the present invention is a mixture of PEG-200 and PEG-1000; The polyester diol may be polycaprolactone diol with a molecular weight of 530, 830 or 1000 or the like.

[0029] The amount of tetrabutyl titanate used is 1.0wt% of the total mass of the reactants.

[0030] The average polymerization degree of the intermediate product IV is 8-15; since the esterification polymerization of dibasic acid and diol belongs to dehydration condensation reaction, the molecular weight and polymerization degree of polyester can be rationally controlled by the molar ratio of the added dibasic acid to diol and the quality of the separated water. When the average polymerization degree is less than 10, the molecular weight is low and its compatibility is poor; when the average polymerization degree is greater than 15, the fluffy feeling of the polyamino acid will be reduced, affecting the comfort.

[0031] S15, N2 protection, add the intermediate product III to the solution containing the intermediate product IV, stir and heat until reflux and the mass of the reaction water is constant; filter, take the filtrate, distill under reduced pressure, and vacuum dry at 60°C for 6h to obtain the target product, i.e., the functional additive.

[0032] The intermediate product III and the intermediate product IV are added at a molar ratio of carboxyl to hydroxyl of 1:1.

[0033] The wool feeling additive in the present invention mainly solves the problems of warmth retention and softness. The molecular structure design adopts aerogel, polyamino acid and hollow structure of fiber to improve the warmth retention performance; the flexible design of polyamino acid and polyester structure, hyperbranched design and hollow structure are adopted to improve the softness; in addition, polyamino acid also has the functions of air permeability, moisture permeability and antistatic, etc. The above structural units cooperate with each other, so as to have the wool feeling imitating animal fiber.

[0034] The intrinsic viscosity of the PET chips is in the range of 0.65 to 0.90 dL / g, and the melting point is 245 to 255° C.; and the PET chips described in the present invention are brand CH 610, purchased from Wuxi Suboshi Plastic Chemical Co., Ltd.

[0035] The antioxidant described in the present invention is a combination of hindered phenols and phosphites. The hindered phenol antioxidants may be antioxidant 1010, antioxidant 1076, antioxidant 264, antioxidant 2246, etc.; and antioxidant 1010 is preferred. The phosphite antioxidants may be antioxidant 168, antioxidant 242, antioxidant TPP, etc.; and antioxidant 168 is preferred. In the following embodiments of the present invention, the antioxidants are antioxidant 1010 and antioxidant 168 added in a mass ratio of 1:2.

[0036] The lubricant may be erucamide, oleamide, ethylene bisstearamide, etc.; and, the lubricant described in the following embodiments of the present invention is erucamide and ethylene bisstearamide mixed and added in a mass ratio of 2:1.

[0037] The fiber treatment agent is a sodium phosphate salt; it may include sodium pyrophosphate, sodium tripolyphosphate, sodium tetrapolyphosphate, sodium pentapolyphosphate, sodium hexametaphosphate, or a mixture thereof; and the sodium phosphate salts described in the following embodiments of the present invention are all sodium pyrophosphate.

[0038] Another object of the embodiment of the present invention is to provide a method for preparing wooly polyester fiber, comprising the following steps: S21: drying and mixing of raw materials; i.e. Weigh the raw materials according to their weight components, mix them, and dry them at 80°C for 24 hours; S22: melt extrusion, pressurization; i.e. The dried raw material is placed in a screw extruder, melted and filtered at a temperature of 250-280°C, and then pumped to a liquid phase conditioning and viscosity adjustment reactor through a melt pump. The melt stays in the reactor for 30 minutes, and the intrinsic viscosity of the final polyester melt is 0.610.70 dL / g. For the melt extrusion, the temperature of each zone of the twin-screw extruder is: 250-260°C in zone 1, 260-270°C in zone 2, 270-275°C in zone 3, 275-280°C in zone 4, and 275-280°C in zone 5; S23: Spinning to obtain primary fibers; i.e. The melt is pumped to the secondary filter, and the filtered melt enters the spinning box after passing through the static mixer set in the pipeline. Under the action of the double C-type spinneret holes, it is cooled to obtain the primary fiber with high vacuum degree. The double C-shaped spinneret holes are two C-shaped spinneret holes connected to each other and arranged symmetrically, and the C-shaped hole grooves thereof are arranged outwardly and facing each other.

[0039] S24: post-processing, i.e., drawing and heat setting; i.e. After balancing, the nascent fiber is sequentially drawn and heat-set, wherein the primary oil bath drawing temperature is 60-70°C, the secondary steam drawing temperature is 100-120°C, and the heat-set temperature is 185-210°C; In the post-processing process, the traction stretching ratio is 3.0-5.0; S25: Curly, relaxed styling; i.e. The stretched fibers enter the crimping machine, where they are crimped with high density. They are then sent to the J-shaped box for arrangement by a reciprocating trolley. The arranged fibers enter the relaxation heat setting machine for setting. The temperature of the crimping machine is 90-110°C, the main pressure is 160-180 kPa, and the back pressure is 180-210 kPa. The relaxation setting temperature is 115-120°C, and the setting time is 0.5 1h; S26: The tow is cut and packaged to obtain wooly polyester fibers.

[0040] In order to further understand the present invention, a wooly polyester fiber and a preparation method thereof provided by the present invention are described in detail below in conjunction with specific embodiments. The protection scope of the present invention is not limited by the following embodiments.

[0041] Example 1 A wooly polyester fiber, comprising the following raw materials in parts by weight: PET slices 100 pieces; 20.0 parts of hair feel additive; 0.6 parts of antioxidant; 0.25 parts of lubricant; 1.0 part of fiber treatment agent; The hair feeling auxiliary agent and its preparation method include the following steps: S11, add aerogel and deionized water A to anhydrous ethanol, ultrasonically disperse for 1 hour, add glacial acetic acid to adjust the pH value to 4.5, add silane coupling agent KH570, stir and ultrasonicate for 0.5 hour, heat to 55°C and reflux for 10.5 hours; after the reaction is completed, filter, take the insoluble matter, rinse with deionized water B, vacuum dry at 40°C to constant weight, grind to obtain intermediate product I.

[0042] The usage ratio of the aerogel, deionized water A, anhydrous ethanol, silane coupling agent KH570, and deionized water B is 1g:2g:18g:0.2g:30g.

[0043] Its infrared data is as follows: 3399cm -1 :-OH exists and weakens; 1735cm -1 :-C=O exists; 1605cm -1 、811cm -1 :-C=C- exists; 1109 cm -1 、799cm -1 :-Si-O- exists.

[0044] S12, N2 protection, add amino acid, p-toluenesulfonic acid, DCC and NHS to anhydrous N,N-dimethylformamide, ice bath for 1 hour, remove the ice bath, continue stirring, determine the water content in the reaction system by gas chromatography and calculate the dehydration mass; filter, take the organic phase, distill under reduced pressure, and vacuum dry at 60°C for 6 hours to obtain intermediate II.

[0045] The amino acids are glycine, lysine, arginine, histidine, and tryptophan added in a molar ratio of 0.1:0:0.6:0:0.3; The amount of p-toluenesulfonic acid used is 1.0wt% of the total weight of amino acids; The usage ratio of the amino acid, DCC, NHS and N,N-dimethylformamide is 1 mol: 1 mol: 0.5 mol: 400 mL.

[0046] The average degree of polymerization of the intermediate product II is 25.6.

[0047] Its infrared data are as follows: 3317cm -1 :-NH- exists and weakens; 1760cm -1 :-C=O (carboxyl) exists and weakens; 1664cm -1 : -C=O (amide) exists.

[0048] S13, adding intermediate product I and intermediate product II to N,N-dimethylformamide, stirring at room temperature for 6 hours, distilling under reduced pressure, and vacuum drying at 40° C. for 8 hours to obtain intermediate product III.

[0049] The intermediate product I and the intermediate product II are added in a molar ratio of acryloyloxy to terminal amino group of 1:1; The usage ratio of the intermediate product I to N,N-dimethylformamide is 1 g:50 mL.

[0050] Its infrared data is as follows: 3399cm -1 :-OH exists; 3317cm -1 :-NH- exists and weakens; 1760cm -1 :-C=O (carboxyl) exists and weakens; 1735cm -1 :-C=O exists; 1664cm -1 :-C=O (amide) exists; 1605cm -1 、811cm -1 :-C=C- does not exist; 1109 cm -1 、799cm -1 :-Si-O- exists.

[0051] S14, N2 protection, add dibasic acid, diol and tetrabutyl titanate into xylene, stir and heat to reflux, calculate the mass of water separated as the reaction end point; obtain a solution containing intermediate product IV.

[0052] The usage ratio of the dibasic acid, diol and xylene is 0.1 mol: 0.1 mol: 100 mL.

[0053] The dibasic acid is sebacic acid and phthalic acid added in a molar ratio of 0.4:0.6; The diols are 1,4-pentanediol, polyether diol, and polycaprolactone diol (molecular weight 530), which are added in a molar ratio of 0.77:0.15:0.08.

[0054] The polyether diol is a mixture of PEG-200 and PEG-1000 in a molar ratio of 4:1.

[0055] The amount of tetrabutyl titanate used is 1.0wt% of the total mass of the reactants.

[0056] The average degree of polymerization of the intermediate product IV is 10.4.

[0057] Its infrared data are as follows: 3430cm -1 :-OH exists; 3011cm -1 、1595cm -1 、1498cm -1 : benzene ring exists; 1760cm -1 :-C=O (carboxyl) exists; 1735cm -1 :-C=O (ester) exists and enhances.

[0058] S15, N2 protection, add the intermediate product III to the solution containing the intermediate product IV, stir and heat until reflux and the mass of the reaction water is constant; filter, take the filtrate, distill under reduced pressure, and vacuum dry at 60°C for 6h to obtain the target product, i.e., the functional additive.

[0059] The intermediate product III and the intermediate product IV are added at a molar ratio of carboxyl to hydroxyl of 1:1.

[0060] Its infrared data are as follows: 3401cm -1 :-OH exists and weakens; 3317cm -1 :-NH- exists; 3011cm -1 、1595cm -1 、1498cm -1 : benzene ring exists; 1760cm -1 :-C=O (carboxyl) exists and weakens; 1735cm -1 :-C=O exists and is enhanced; 1664cm-1 :-C=O (amide) exists; 1109 cm -1 、799cm -1 :-Si-O- exists.

[0061] Another object of the present embodiment is to provide a method for preparing wooly polyester fiber, comprising the following steps: S21: drying and mixing of raw materials; i.e. Weigh the raw materials according to their weight components, mix them, and dry them at 80°C for 24 hours; S22: melt extrusion, pressurization; i.e. The dried raw material is placed in a screw extruder, melt-filtered, and then pumped to a liquid phase conditioning and viscosity adjustment reactor via a melt pump. The melt stays in the reactor for 30 minutes, and the intrinsic viscosity of the final polyester melt is 0.65 dL / g. For the melt extrusion, the temperature of each zone of the twin-screw extruder is: 255°C in zone 1, 264°C in zone 2, 272°C in zone 3, 277°C in zone 4, and 277°C in zone 5; S23: Spinning to obtain primary fibers; i.e. The melt is pumped to the secondary filter, and the filtered melt enters the spinning box after passing through the static mixer set in the pipeline. Under the action of the double C-type spinneret holes, it is cooled to obtain the primary fiber with high vacuum degree. The double C-shaped spinneret holes are two C-shaped spinneret holes connected to each other and arranged symmetrically, and their C-shaped hole grooves are arranged outwardly and back to back. The inner diameter of the C-shaped spinneret ring is 0.08mm, the outer diameter of the ring is 0.22mm, and the opening arc of the C-shaped hole groove is π / 3.

[0062] S24: post-processing, i.e., drawing and heat setting; i.e. After balancing, the nascent fiber is sequentially drawn and heat-set, wherein the first-stage oil bath drawing temperature is 65°C, the second-stage steam drawing temperature is 110°C, and the heat-set temperature is 200°C; In the post-processing process, the traction stretching ratio is 4.0; S25: Curly, relaxed styling; i.e. The stretched fibers enter the crimping machine, where they are crimped with high density. They are then sent to the J-shaped box for arrangement by a reciprocating trolley. The arranged fibers enter the relaxation heat setting machine for setting. The temperature of the crimping machine is 100°C, the main pressure is 175kPa, and the back pressure is 200kPa. The relaxation setting temperature is 120°C and the setting time is 0.5h; S26: The tow is cut and packaged to obtain wooly polyester fibers.

[0063] Example 2 A wooly polyester fiber, comprising the following raw materials in parts by weight: PET slices 100 pieces; 15.0 parts of hair feel additive; 0.2 parts of antioxidant; 0.3 parts of lubricant; 1.5 parts of fiber treatment agent; The hair feeling auxiliary agent and its preparation method include the following steps: S11, adding aerogel and deionized water A to anhydrous ethanol, ultrasonically dispersing for 1 hour, adding glacial acetic acid to adjust the pH value to 3.5, adding silane coupling agent KH570, stirring and ultrasonicating for 0.5 hour, heating to 60°C and reflux for 12 hours; after the reaction is completed, filtering, taking the insoluble matter, rinsing with deionized water B, vacuum drying at 40°C to constant weight, grinding, and obtaining intermediate product I.

[0064] The usage ratio of the aerogel, deionized water A, anhydrous ethanol, silane coupling agent KH570, and deionized water B is 1g:2g:18g:0.3g:30g.

[0065] S12, N2 protection, add amino acid, p-toluenesulfonic acid, DCC and NHS to anhydrous N,N-dimethylformamide, ice bath for 1 hour, remove the ice bath, continue stirring, determine the water content in the reaction system by gas chromatography and calculate the dehydration mass; filter, take the organic phase, distill under reduced pressure, and vacuum dry at 60°C for 6 hours to obtain intermediate II.

[0066] The amino acids are glycine, lysine, arginine, histidine, and tryptophan added in a molar ratio of 0.1:0:0.7:0:0.2; The amount of p-toluenesulfonic acid used is 1.0wt% of the total weight of amino acids; The usage ratio of the amino acid, DCC, NHS and N,N-dimethylformamide is 1 mol: 1 mol: 0.5 mol: 400 mL.

[0067] The average degree of polymerization of the intermediate product II is 25.8.

[0068] S13, adding intermediate product I and intermediate product II to N,N-dimethylformamide, stirring at room temperature for 4 hours, distilling under reduced pressure, and vacuum drying at 40° C. for 8 hours to obtain intermediate product III.

[0069] The intermediate product I and the intermediate product II are added in a molar ratio of acryloyloxy to terminal amino group of 1:1; The usage ratio of the intermediate product I to N,N-dimethylformamide is 1 g:50 mL.

[0070] S14, N2 protection, add dibasic acid, diol and tetrabutyl titanate into xylene, stir and heat to reflux, calculate the mass of water separated as the reaction end point; obtain a solution containing intermediate product IV.

[0071] The usage ratio of the dibasic acid, diol and xylene is 0.1 mol: 0.1 mol: 100 mL.

[0072] The dibasic acid is sebacic acid and phthalic acid added in a molar ratio of 0.5:0.5; The diols are 1,4-pentanediol, polyether diol, and polycaprolactone diol (molecular weight 530), which are added in a molar ratio of 0.75: 0.2: 0.05.

[0073] The polyether diol is a mixture of PEG-200 and PEG-1000 in a molar ratio of 4:1.

[0074] The amount of tetrabutyl titanate used is 1.0wt% of the total mass of the reactants.

[0075] The average degree of polymerization of the intermediate product IV is 10.2.

[0076] S15, N2 protection, add the intermediate product III to the solution containing the intermediate product IV, stir and heat until reflux and the mass of the reaction water is constant; filter, take the filtrate, distill under reduced pressure, and vacuum dry at 60°C for 6h to obtain the target product, i.e., the functional additive.

[0077] The intermediate product III and the intermediate product IV are added at a molar ratio of carboxyl to hydroxyl of 1:1.

[0078] Another object of the present embodiment is to provide a method for preparing wooly polyester fiber, comprising the following steps: S21: drying and mixing of raw materials; i.e. Weigh the raw materials according to their weight components, mix them, and dry them at 80°C for 24 hours; S22: melt extrusion, pressurization; i.e. The dried raw material is placed in a screw extruder, melt-filtered, and then pumped to a liquid phase conditioning and viscosity adjustment reactor via a melt pump. The melt stays in the reactor for 30 minutes, and the intrinsic viscosity of the final polyester melt is 0.70 dL / g. For the melt extrusion, the temperature of each zone of the twin-screw extruder is: 260°C in zone 1, 270°C in zone 2, 275°C in zone 3, 280°C in zone 4, and 280°C in zone 5; S23: Spinning to obtain primary fibers; i.e. The melt is pumped to the secondary filter, and the filtered melt enters the spinning box after passing through the static mixer set in the pipeline. Under the action of the double C-type spinneret holes, it is cooled to obtain the primary fiber with high vacuum degree. The double C-shaped spinneret holes are two C-shaped spinneret holes connected to each other and arranged symmetrically, and their C-shaped hole grooves are arranged outwardly and back to back. The inner diameter of the C-shaped spinneret ring is 0.08mm, the outer diameter of the ring is 0.22mm, and the opening arc of the C-shaped hole groove is π / 3.

[0079] S24: post-processing, i.e., drawing and heat setting; i.e. After balancing, the nascent fiber is sequentially drawn and heat-set, wherein the first-stage oil bath drawing temperature is 70°C, the second-stage steam drawing temperature is 120°C, and the heat-set temperature is 210°C; In the post-processing process, the traction stretching ratio is 5.0; S25: Curly, relaxed styling; i.e. The stretched fibers enter the crimping machine, where they form high-density crimped fibers. They are then sent to the J-shaped box for arrangement by a reciprocating trolley. The arranged fibers enter the relaxation heat setting machine for setting. The temperature of the crimping machine is 110°C, the main pressure is 180kPa, and the back pressure is 210kPa. The relaxation setting temperature is 120°C and the setting time is 0.5h; S26: The tow is cut and packaged to obtain wooly polyester fibers.

[0080] Example 3 A wooly polyester fiber, comprising the following raw materials in parts by weight: PET slices 100 pieces; 25.0 parts of hair feel additive; 1.0 part of antioxidant; Lubricant 0.1 part; 0.5 parts of fiber treatment agent; The hair feeling auxiliary agent and its preparation method include the following steps: S11, adding aerogel and deionized water A to anhydrous ethanol, ultrasonically dispersing for 1 hour, adding glacial acetic acid to adjust the pH value to 5.5, adding silane coupling agent KH570, stirring and ultrasonicating for 0.5 hour, heating to 80°C and reflux for 8 hours; after the reaction is completed, filtering, taking the insoluble matter, rinsing with deionized water B, vacuum drying at 40°C to constant weight, grinding, and obtaining intermediate product I.

[0081] The usage ratio of the aerogel, deionized water A, anhydrous ethanol, silane coupling agent KH570, and deionized water B is 1g:2g:18g:0.1g:30g.

[0082] S12, N2 protection, add amino acid, p-toluenesulfonic acid, DCC and NHS to anhydrous N,N-dimethylformamide, ice bath for 1 hour, remove the ice bath, continue stirring, determine the water content in the reaction system by gas chromatography and calculate the dehydration mass; filter, take the organic phase, distill under reduced pressure, and vacuum dry at 60°C for 6 hours to obtain intermediate II.

[0083] The amino acids are glycine, lysine, arginine, histidine, and tryptophan added in a molar ratio of 0.1:0:0.5:0:0.4; The amount of p-toluenesulfonic acid used is 1.0wt% of the total weight of amino acids; The usage ratio of the amino acid, DCC, NHS and N,N-dimethylformamide is 1 mol: 1 mol: 0.5 mol: 400 mL.

[0084] The average degree of polymerization of the intermediate product II is 25.2.

[0085] S13, adding intermediate product I and intermediate product II to N,N-dimethylformamide, stirring at room temperature for 8 h, distilling under reduced pressure, and vacuum drying at 40° C. for 8 h to obtain intermediate product III.

[0086] The intermediate product I and the intermediate product II are added in a molar ratio of acryloyloxy to terminal amino group of 1:1; The usage ratio of the intermediate product I to N,N-dimethylformamide is 1 g:50 mL.

[0087] S14, N2 protection, add dibasic acid, diol and tetrabutyl titanate into xylene, stir and heat to reflux, calculate the mass of water separated as the reaction end point; obtain a solution containing intermediate product IV.

[0088] The usage ratio of the dibasic acid, diol and xylene is 0.1 mol: 0.1 mol: 100 mL.

[0089] The dibasic acid is sebacic acid and phthalic acid added in a molar ratio of 0.3:0.7; The diols are 1,4-pentanediol, polyether diol, and polycaprolactone diol (molecular weight 530), which are added in a molar ratio of 0.8:0.1:0.1.

[0090] The polyether diol is a mixture of PEG-200 and PEG-1000 in a molar ratio of 4:1.

[0091] The amount of tetrabutyl titanate used is 1.0wt% of the total mass of the reactants.

[0092] The average degree of polymerization of the intermediate product IV is 10.5.

[0093] S15, N2 protection, add the intermediate product III to the solution containing the intermediate product IV, stir and heat until reflux and the mass of the reaction water is constant; filter, take the filtrate, distill under reduced pressure, and vacuum dry at 60°C for 6h to obtain the target product, i.e., the functional additive.

[0094] The intermediate product III and the intermediate product IV are added at a molar ratio of carboxyl to hydroxyl of 1:1.

[0095] Another object of the present embodiment is to provide a method for preparing wooly polyester fiber, comprising the following steps: S21: drying and mixing of raw materials; i.e. Weigh the raw materials according to their weight components, mix them, and dry them at 80°C for 24 hours; S22: melt extrusion, pressurization; i.e. The dried raw material is placed in a screw extruder, melt-filtered, and then pumped to a liquid phase conditioning and viscosity adjustment reactor via a melt pump. The melt stays in the reactor for 30 minutes, and the intrinsic viscosity of the final polyester melt is 0.61 dL / g. For the melt extrusion, the temperature of each zone of the twin-screw extruder is: 250°C in zone 1, 261°C in zone 2, 270°C in zone 3, 275°C in zone 4, and 275°C in zone 5; S23: Spinning to obtain primary fibers; i.e. The melt is pumped to the secondary filter, and the filtered melt enters the spinning box after passing through the static mixer set in the pipeline. Under the action of the double C-type spinneret holes, it is cooled to obtain the primary fiber with high vacuum degree. The double C-shaped spinneret holes are two C-shaped spinneret holes connected to each other and arranged symmetrically, and their C-shaped hole grooves are arranged outwardly and back to back. The inner diameter of the C-shaped spinneret ring is 0.08mm, the outer diameter of the ring is 0.22mm, and the opening arc of the C-shaped hole groove is π / 3.

[0096] S24: post-processing, i.e., drawing and heat setting; i.e. After balancing, the nascent fiber is sequentially drawn and heat-set, wherein the first-stage oil bath drawing temperature is 60°C, the second-stage steam drawing temperature is 100°C, and the heat-set temperature is 185°C; In the post-processing process, the traction stretching ratio is 3.0; S25: Curly, relaxed styling; i.e. The stretched fibers enter the crimping machine, where they are crimped with high density. They are then sent to the J-shaped box for arrangement by a reciprocating trolley. The arranged fibers enter the relaxation heat setting machine for setting. The temperature of the crimping machine is 90°C, the main pressure is 160kPa, and the back pressure is 180kPa. The relaxation setting temperature is 115°C and the setting time is 1h; S26: The tow is cut and packaged to obtain wooly polyester fibers.

[0097] Example 4 The rest is the same as in Example 1, except that: A wooly polyester fiber, comprising the following raw materials in parts by weight: PET slices 100 pieces; 18.0 parts of wool feel additive; 0.6 parts of antioxidant; 0.25 parts of lubricant; 1.0 part of fiber treatment agent.

[0098] Example 5 The rest is the same as in Example 1, except that: A wooly polyester fiber, comprising the following raw materials in parts by weight: PET slices 100 pieces; 23.0 parts of hair feel additive; 0.6 parts of antioxidant; 0.25 parts of lubricant; 1.0 parts of fiber treatment agent. Example 6 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S12, The amino acids are glycine, lysine, arginine, histidine and tryptophan, which are added in a molar ratio of 0:0.1:0.6:0:0.3.

[0099] Example 7 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S12, The amino acids are glycine, lysine, arginine, histidine and tryptophan, which are added in a molar ratio of 0:0:0.6:0.1:0.3.

[0100] Example 8 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S12, The amino acids are glycine, lysine, arginine, histidine and tryptophan, which are added in a molar ratio of 0.1:0.1:0.5:0:0.3.

[0101] Example 9 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S12, The amino acids are glycine, lysine, arginine, histidine and tryptophan, which are added in a molar ratio of 0.1:0.1:0.5:0.1:0.2.

[0102] Example 10 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S12, The amino acids are glycine, lysine, arginine, histidine and tryptophan, which are added in a molar ratio of 0:0:0.6:0:0.

[0103] Embodiment 11 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S12, The average degree of polymerization of the intermediate product II is 18.3.

[0104] Example 12 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S12, The average degree of polymerization of the intermediate product II is 29.8.

[0105] Example 13 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S14, The sebacic acid is replaced with 3-tert-butyl adipic acid; The phthalic acid is replaced by isophthalic acid; and The 1,4-pentanediol was replaced with 1,3-butanediol.

[0106] Embodiment 14 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S14, Replacing the sebacic acid with succinic acid; The phthalic acid is replaced with 4-ethylbenzene-1,3-dicarboxylic acid; and The 1,4-pentanediol was replaced with octanediol.

[0107] Embodiment 15 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S14, The polyether diol is a mixture of PEG-200 and PEG-1000 in a molar ratio of 3:1.

[0108] Example 16 The rest is the same as in Example 1, except that: The hair feeling auxiliary agent, and the preparation method thereof, in S14, The polyether diol is a mixture of PEG-200 and PEG-1000 in a molar ratio of 5:1.

[0109] Embodiment 17 The rest is the same as in Example 1, except that: The hair feeling auxiliary agent, and the preparation method thereof, in S14, The average degree of polymerization of the intermediate product IV is 8.1.

[0110] Embodiment 18 The rest is the same as in Example 1, except that: The hair feeling auxiliary agent, and the preparation method thereof, in S14, The average degree of polymerization of the intermediate product IV is 14.7.

[0111] The following comparative examples are compared with Example 1: Comparative Example 1 The rest is the same as in Example 1, except that: A wooly polyester fiber formula does not include any wooly feel additives.

[0112] Comparative Example 2 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The functional additive, and the preparation method thereof, in S11, The aerogel is replaced with micron-sized spherical silica.

[0113] Comparative Example 3 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S13, The intermediate II was replaced with arginine.

[0114] Comparative Example 4 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S12, The amino acid was replaced with aminocaproic acid.

[0115] Comparative Example 5 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S12, The amino acid was replaced by adding hexamethylenediamine and adipic acid in a molar ratio of 1:1.

[0116] Comparative Example 6 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S12, The average degree of polymerization of the intermediate product II is 17.1.

[0117] Comparative Example 7 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S12, The average degree of polymerization of the intermediate product II is 31.3.

[0118] Comparative Example 8 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feel aid is the intermediate product III.

[0119] Comparative Example 9 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S14, The dibasic acid is sebacic acid and phthalic acid added in a molar ratio of 0.4:0; that is, no phthalic acid is added.

[0120] Comparative Example 10 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S14, The dibasic acid is sebacic acid and phthalic acid added in a molar ratio of 0:0.6; that is, sebacic acid is not added.

[0121] Comparative Example 11 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S14, The phthalic acid is replaced by terephthalic acid.

[0122] Comparative Example 12 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S14, The 1,4-pentanediol was replaced with ethylene glycol.

[0123] Comparative Example 13 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S14, The diols are 1,4-pentanediol, polyether diol, and polycaprolactone diol (molecular weight 530) added in a molar ratio of 0.77:0:0.08; that is, no polyether diol is added.

[0124] Comparative Example 14 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S14, The diols are 1,4-pentanediol, polyether diol, and polycaprolactone diol (molecular weight 530), which are added in a molar ratio of 0.77:0.15:0; that is, polycaprolactone diol is not added.

[0125] Comparative Example 15 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S14, The average degree of polymerization of the intermediate product IV is 6.8.

[0126] Comparative Example 16 The rest is the same as in Example 1, except that: In a wooly polyester fiber formula, The hair feeling auxiliary agent, and the preparation method thereof, in S14, The average degree of polymerization of the intermediate product IV is 16.4.

[0127] Comparative Example 17 The rest is the same as in Example 1, except that: A method for preparing wooly polyester fiber, wherein in S23, The double C-type spinneret holes are replaced with common round spinneret holes, that is, used to prepare solid fibers.

[0128] The physical properties of the polyester fibers prepared in the embodiments of the present invention and the comparative examples were measured respectively, and the results are shown in Table 1.

[0129] Table 1 Physical test performance of each embodiment Example Thermal conductivity (W / m▪K) Tensile strength (cN / dtex) Elongation at break (%) Softness Antibacterial activity (%) Staphylococcus aureus Antibacterial activity (%) Escherichia coli Example 1 0.037 3.2 103.6 ☆ 97.2 96.1 Example 2 0.043 3.6 87.1 ★ 96.3 95.2 Example 3 0.036 3.3 100.4 ☆ 97.3 95.9 Example 4 0.040 3.5 96.7 ★ 97.0 95.8 Example 5 0.037 3.1 110.3 ☆ 96.9 96.0 Example 6 0.039 3.2 104.4 ☆ 97.6 96.4 Example 7 0.039 3.3 100.9 ☆ 96.8 96.2 Example 8 0.040 3.3 97.7 ☆ 97.1 95.5 Example 9 0.039 3.4 94.5 ☆ 96.5 95.8 Example 10 0.038 3.2 105.1 ☆ 96.3 95.2 Embodiment 11 0.042 3.6 89.6 ★ 96.0 94.8 Example 12 0.036 3.0 107.8 ☆ 97.3 96.0 Example 13 0.037 3.3 99.4 ☆ 96.6 95.9 Embodiment 14 0.037 3.3 105.3 ☆ 96.8 96.2 Embodiment 15 0.038 3.1 106.5 ☆ 96.3 95.5 Example 16 0.038 3.5 94.7 ☆ 96.1 95.4 Embodiment 17 0.037 3.0 83.2 ★ 97.3 96.1 Embodiment 18 0.043 3.7 81.5 ★ 95.7 94.5 Comparative Example 1 0.079 4.7 54.8 ● 24.1 17.0 Comparative Example 2 0.080 4.2 87.2 ○ 96.6 94.5 Comparative Example 3 0.045 4.4 79.4 ◎ 26.5 17.9 Comparative Example 4 0.048 3.9 82.0 ○ 28.2 18.6 Comparative Example 5 0.050 4.0 81.5 ○ 28.9 18.4 Comparative Example 6 0.043 3.8 83.3 ○ 94.0 91.8 Comparative Example 7 0.037 2.6 96.2 ○ 97.1 96.1 Comparative Example 8 0.054 2.4 66.7 ◎ 94.2 92.7 Comparative Example 9 0.052 2.5 78.1 ★ 94.6 92.9 Comparative Example 10 0.053 4.5 60.9 ○ 93.8 92.0 Comparative Example 11 0.048 4.0 82.9 ★ 95.0 93.6 Comparative Example 12 0.048 4.1 80.2 ★ 94.8 93.7 Comparative Example 13 0.049 3.9 86.5 ○ 95.4 94.3 Comparative Example 14 0.049 3.8 92.8 ○ 95.2 94.0 Comparative Example 15 0.037 3.0 77.4 ○ 97.0 96.2 Comparative Example 16 0.045 3.9 79.5 ○ 92.7 91.3 Comparative Example 17 0.063 5.2 100.7 ○ 91.1 89.8 First, it can be concluded from Examples 1-18 in Table 1 that the wooly polyester fiber of the present invention has excellent warmth retention (low thermal conductivity), softness, and excellent antibacterial properties.

[0130] Second, it can be observed from Example 1 and Comparative Examples 1-2 that the wooly polyester fiber of the present invention has excellent thermal insulation performance, thanks to the extremely low thermal conductivity of the aerogel and its uniform distribution in the polyester fiber; It can be observed from Example 1 and Comparative Examples 3-7 that the wooly polyester fiber of the present invention has a polyamino acid structural component similar to natural fiber in its functional additive, has excellent softness and comfort, and also has excellent antibacterial effect; it can be observed from Example 1 and Comparative Examples 4-5 that polyamino acid has better warmth retention and softness than polyamide; it can be observed from Example 1 and Comparative Examples 6-7 that polyamino acid with a suitable molecular weight has a positive effect on improving warmth retention and softness; It can be observed from Example 1 and Comparative Examples 8-16 that the polyester structure of the outer layer in the functional additive of the wooly polyester fiber of the present invention can improve the compatibility with the substrate and a certain softness; it can be observed from Example 1 and Comparative Example 8 that the polyester structure of the outer layer plays an important role in improving the compatibility; it can be observed from Example 1 and Comparative Examples 9-14 that the polyester chain structure composed of a flexible chain, a certain side group structure and a non-para-substituted benzene ring structure has a positive effect on improving the softness; it can be observed from Example 1 and Comparative Examples 15-16 that the appropriate degree of polymerization in the functional additive of the wooly polyester fiber of the present invention has an important influence on various properties such as compatibility and softness; It can be observed from Example 1 and Comparative Examples 1 and 17 that the hollow structure of the polyester fiber and the aerogel have a synergistic effect on warmth retention.

[0131] In summary, the wooly polyester fiber provided by the present invention is prepared through molecular design, homemade functional additives and formula design, and has excellent warmth retention and softness, as well as excellent antibacterial properties, the effect of reducing fiber weight, and excellent natural wooly feel.

[0132] The test method is as follows: (1) Thermal conductivity: Tested according to the method described in GB / T 11048-2018. The lower the thermal conductivity, the better the thermal insulation performance.

[0133] (2) Tensile strength: Tested according to the method described in GB / T 14337-2008.

[0134] (3) Elongation at break: Tested according to the method described in GB 9997-88.

[0135] (4) Softness: The pendulum method is used to evaluate softness. The softness is expressed by qualitative analysis, and the softness levels are recorded from high to low as "☆", "★", "○", "◎", and "●".

[0136] (5) Antibacterial property: The standard GB / T 20944.3 2008 “Evaluation of antibacterial properties of textiles” was adopted.

[0137] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A wooly polyester fiber, characterized in that: The invention comprises the following raw materials in parts by weight: PET slices 100 pieces; 15.0-25.0 parts of hair feeling additive; Antioxidant 0.2-1.0 part; Lubricant 0.1-0.3 parts; Fiber treatment agent 0.5-1.5 parts; The hair feeling auxiliary agent and its preparation method include the following steps: S11, performing a silylation coupling reaction on the aerogel and an acryloxysilane coupling agent to obtain an intermediate product I; The usage ratio of the aerogel to the acryloxysilane coupling agent is 1g:0.1-0.3g; S12, subjecting the amino acid to polycondensation reaction to obtain an intermediate product II; S13, adding the intermediate product I to the intermediate product II to carry out Michael addition reaction to obtain an intermediate product III; The intermediate product I and the intermediate product II are added in a molar ratio of acryloyloxy group to terminal amino group of 1:1; S14, subjecting the dibasic acid and the diol to a polycondensation reaction to obtain an intermediate product IV; The molar ratio of the dibasic acid to the diol is 1:1; S15, adding the intermediate product III to the intermediate product IV for esterification reaction to obtain the target product, i.e., the hair feel additive; The intermediate product III and the intermediate product IV are added at a molar ratio of carboxyl to hydroxyl of 1:

1.

2. The wooly polyester fiber according to claim 1, characterized in that: The amino acid is an amino acid containing a side group.

3. The wooly polyester fiber according to claim 2, characterized in that: The amino acid containing a side group is one or more of glycine, lysine, arginine, histidine or tryptophan.

4. The wooly polyester fiber according to claim 1, characterized in that: The dibasic acid is a fatty acid and an aromatic acid added in a molar ratio of 0.3-0.5:0.5-0.7; as well as The diols are small molecule dihydric fatty alcohols, polyether diols, and polyester diols, which are added in a molar ratio of 0.75-0.8:0.1-0.2:0.05-0.

10.

5. The wooly polyester fiber according to claim 4, characterized in that: The number of carbon atoms in the fatty acid is C4-C10; The two carboxyl groups in the aromatic acid are in a non-para-position structure; The number of carbon atoms in the small molecule dihydric fatty alcohol is C4-C8; The molecular weight of the polyether diol is 200-1000; and The molecular weight of the polyester diol is 500-1000.

6. The wooly polyester fiber according to claim 1, characterized in that: The average polymerization degree of the intermediate product II is 18-30; and The average degree of polymerization of the intermediate product IV is 8-15.

7. The wooly polyester fiber according to claim 1, characterized in that: The intrinsic viscosity of the PET chips ranges from 0.65 to 0.90 dL / g, and the melting point ranges from 245 to 255°C.

8. A method for preparing wooly polyester fiber, characterized in that: The following steps are involved: S21: drying and mixing of raw materials; S22: melt extrusion, pressurization; S23: spinning to obtain nascent fibers; S24: post-processing, i.e., drawing and heat setting; S25: Curly, loose styling; S26: The tow is cut and packaged to obtain wooly polyester fibers.

9. The method for preparing wooly polyester fiber according to claim 8, characterized in that: For the melt extrusion, the temperature of each zone of the twin-screw extruder is: 250-260°C in zone 1, 260-270°C in zone 2, 270-275°C in zone 3, 275-280°C in zone 4, and 275-280°C in zone 5; The spinning is to use double C-type spinnerets to spray out the filament bundle; the double C-type spinnerets are two C-type spinnerets connected to each other and arranged symmetrically, and their C-type hole grooves are arranged outwardly and back to back.