A kind of high-flexibility and high-elasticity colored DTY and preparation method thereof

Abstract

The invention belongs to the technical field of chemical fibers, and specifically relates to a highly flexible and highly elastic colored DTY and a preparation method thereof, wherein the mass ratio of the DTY is: 70-90 parts of polyethylene terephthalate, 3-5 parts of oil, 3-6 parts of modified inorganic filler, 0.1-0.3 parts of coupling agent, 1-2 parts of masterbatch, and 0.2-0.4 parts of dispersant; the oil adopts a mixture of sorbitan fatty acid ester and castor oil polyoxyethylene ether, and provides a preparation method of the DTY. The invention solves the problems of poor elasticity and general softness of the existing DTY, and utilizes the synergistic effect of sorbitan fatty acid ester and castor oil polyoxyethylene ether to not only improve the elasticity of DTY, but also improve the flexibility of DTY and achieve an improvement in hand feel.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical fibers, and in particular relates to a highly flexible and highly elastic colored DTY and a preparation method thereof. Background Art

[0002] DTY is a polyester low-elastic yarn, a type of deformed yarn of polyester chemical fiber. It is made of polyester chips as raw materials, high-speed spinning of polyester pre-oriented yarn, and then processed by drawing and false twisting. The DTY preparation process has the characteristics of short process, high efficiency, and good quality. The prepared DTY not only has the characteristics of breaking strength, elastic modulus, rebound performance, heat resistance, and light resistance of general polyester, but also has the characteristics of high fluffiness, good thermal insulation performance, and comfortable feel. However, in actual use, DTY itself is a low-elastic yarn with average softness, which is difficult to meet the growing demand for fabrics, greatly reducing its application scope. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a highly flexible and elastic colored DTY, which solves the problems of poor elasticity and general softness of the prior DTY. By utilizing the synergistic effect of sorbitan fatty acid ester and castor oil polyoxyethylene ether, not only the elasticity of DTY is improved, but also the flexibility of DTY can be improved, thereby improving the hand feel.

[0004] In order to achieve the above technical objectives, the technical solution of the present invention is:

[0005] A highly flexible and elastic colored DTY, the mass ratio of which is:

[0006] 100-110 parts of polyethylene terephthalate, 2-3 parts of oil agent, 3-5 parts of modified inorganic filler, 0.1-0.3 parts of coupling agent, 1-2 parts of masterbatch, and 0.2-0.4 parts of dispersant.

[0007] The oil agent is a mixture of sorbitan fatty acid ester and castor oil polyoxyethylene ether, and the mass ratio of sorbitan fatty acid ester to castor oil polyoxyethylene ether is 1:1-1.2. The sorbitan fatty acid ester itself is a nonionic surfactant, which has the effects of emulsification, dispersion and antistatic. Meanwhile, the castor oil polyoxyethylene ether has solubilization and emulsification effects. The combination of the two can not only effectively improve the smoothness and softness of DTY.

[0008] The modified inorganic filler adopts polyvinyl alcohol modified wollastonite fiber. The wollastonite fiber itself belongs to a needle-like fiber structure, has good wear resistance and insulation, plays an excellent filler role, increases fluidity and improves the mechanical properties of DTY. Adding wollastonite fiber to DTY can effectively improve the elasticity and durability of DTY.

[0009] However, wollastonite fiber is a calcium metasilicate material with a certain surface inertness. It often has problems of poor dispersion and poor compatibility when combined with polymers. Although adding wollastonite directly to DTY can effectively improve some properties of DTY, the incompatibility of wollastonite fiber will gradually pulverize during long-term use, causing damage to DTY and degradation of performance. To address this problem, the wollastonite fiber is surface treated to improve the surface inertness of the wollastonite fiber, and polyvinyl alcohol is used to enhance the chemical activity of the wollastonite surface, and to form a stable connection with other materials on DTY, thereby improving the connection stability of the wollastonite fiber and the weather resistance of DTY.

[0010] The preparation method of polyvinyl alcohol modified wollastonite fiber comprises the following steps: a1, adding wollastonite fiber to ethanol ether mixed solution for ultrasonic treatment for 20-30 minutes, taking out and adding to ethanol aqueous solution for secondary ultrasonic treatment for 30-60 minutes, and drying to obtain clean wollastonite fiber, wherein the volume ratio of ethanol to ether in the ethanol ether mixed solution is 2:1-2, the concentration of the wollastonite fiber in the ethanol ether mixed solution is 100-200g / L, the ultrasonic frequency of ultrasonic treatment is 80-100kHz, and the temperature is 5-10°C; the volume ratio of ethanol to water in the ethanol aqueous solution is 2-5:1, the ultrasonic frequency of secondary ultrasonic treatment is 80-100kHz, the temperature is 30-40°C, and the drying temperature is 100-120°C; in this step, the ethanol ether mixed solution and the ethanol aqueous solution are used as washing liquids in turn to clean the surface of the wollastonite fiber, and the surface impurities and surface grease are completely removed by double washing with organic solvent and aqueous solution to achieve the effect of surface cleaning.

[0011] a2, spray hydrochloric acid on the surface of wollastonite fiber, let it stand for 10-20 minutes and then wash to obtain roughened wollastonite fiber, wherein the wollastonite fiber is needle-shaped wollastonite fiber, the pH of the hydrochloric acid is 5-6, and the spraying amount is 1-2 mL / cm 2 The standing temperature is 10-20°C, and anhydrous ethanol is used for washing. In this step, a stable liquid film is formed on the surface of the wollastonite fiber by spraying hydrochloric acid, and the wollastonite fiber is corroded in situ by hydrochloric acid, thereby achieving the purpose of roughening the surface of the wollastonite fiber.

[0012] a3, adding 3-aminopropyltriethoxysilane to diethyl ether and stirring evenly, putting wollastonite fiber into it and ultrasonicating it for 20-30 minutes, taking it out and reducing the pressure and letting it stand to obtain initially coated wollastonite, the mass ratio of the 3-aminopropyltriethoxysilane to diethyl ether is 1:10-20, the concentration of the wollastonite fiber in diethyl ether is 40-90g / L, the frequency of the ultrasound is 70-90kHz, the temperature is 5-10°C, the pressure of the reduced pressure and standing is 70-80% of the atmospheric pressure, the standing atmosphere is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10-12:1. This step utilizes the solubility of 3-aminopropyltriethoxysilane in diethyl ether to form a liquid phase dispersion system, and forms a surface liquid film during the ultrasonic treatment of the wollastonite fiber. During the standing process, the ether is converted into steam and removed, and the ethoxy group in the 3-aminopropyltriethoxysilane is converted into silanol group when it encounters water, thereby obtaining coated wollastonite fiber with diversified surface activity.

[0013] a4, add dopamine into water, stir evenly, put into the primary coated wollastonite fiber, stir at a constant speed for 1-2h, take out and dry the secondary coated wollastonite fiber at a constant temperature, the concentration of dopamine in water is 10-30g / L, the stirring speed is 300-500r / min, and the temperature of the constant temperature drying is 50-60°C; this step utilizes the stable dispersibility and low concentration of dopamine in water, can be homogeneously dispersed in the entire solution, and forms positive and negative charge attraction when the wollastonite fiber is added, ensuring that a stable dopamine liquid film is formed on the surface of the primary coated wollastonite fiber, and during the constant temperature drying, polydopamine forms a self-polymerization reaction in a weak alkaline environment, thereby forming a polydopamine film layer on the surface, and at the same time, the internal 3-aminopropyltriethoxysilane hydrolyzate, the acid-washed hydroxyl group on the surface of the wollastonite fiber and the active group of dopamine itself form an interlaced polycondensation reaction, ensuring internal integration.

[0014] a5, adding polyvinyl alcohol into water and stirring evenly to form a dilute solution, then spraying it on the surface of the secondary coated wollastonite fiber, and sintering it after constant temperature drying to obtain polyvinyl alcohol modified wollastonite fiber, wherein the concentration of the polyvinyl alcohol in water is 100-150g / L, the amount of the spray is 3-5mL / cm2, the temperature of the constant temperature drying is 160-170°C; the sintering temperature is 255-260°C; in this step, the dilute polyvinyl alcohol solution is sprayed on the upper surface of the secondary coated wollastonite fiber, and the polyvinyl alcohol is fixedly connected to the surface of polydopamine through sintering treatment after drying, and the polyvinyl alcohol undergoes self-condensation reaction to form a polyvinyl alcohol condensation product. The polyvinyl alcohol modified wollastonite fiber prepared by the method has a polyvinyl alcohol condensation polymer as an outer shell, polydopamine as an adhesive conductive layer, and a wollastonite fiber as an inner core; the polyvinyl alcohol condensation polymer and polydopamine on the polyvinyl alcohol modified wollastonite fiber form an antistatic system to prevent static electricity accumulation; the polyvinyl alcohol condensation polymer has not only good stability but also certain activity, thereby ensuring its connection stability in DTY and solving the problem of surface inertia of the wollastonite fiber; the polyvinyl alcohol modified wollastonite fiber has a polyvinyl alcohol condensation polymer as an outer shell, exhibits the performance of the polyvinyl alcohol condensation polymer in DTY, and improves the elasticity of the DTY.

[0015] The coupling agent is N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane or γ-methacryloxypropyltrimethoxysilane.

[0016] The masterbatch is one or more of magenta masterbatch, cyan masterbatch and yellow masterbatch.

[0017] The dispersant is zinc stearate, which has good lubricity and demoulding properties, reduces the burr problem of DTY, and effectively improves the processability and quality of DTY. At the same time, zinc stearate can improve thermal stability and antibacterial properties.

[0018] The method for preparing the highly flexible and highly elastic colored DTY comprises the following steps:

[0019] Step 1, drying the polyethylene terephthalate, then grinding it, and obtaining polyethylene terephthalate fine powder by secondary drying, wherein the drying temperature is 120-125°C, the grinding temperature is 30-50°C, the grinding pressure is 0.5-0.7MPa, the secondary drying temperature is 120-130°C, and the time is 2-3h; this step completely dries the polyethylene terephthalate by drying and secondary drying, and extrude the polyethylene terephthalate particles by grinding to achieve a refining effect;

[0020] Step 2, putting the oil into a reaction kettle and stirring at a constant temperature, and adding the modified inorganic filler, masterbatch and dispersant in sequence to form a premix, and then adding the coupling agent and polyethylene terephthalate fine powder and stirring at a high temperature to obtain a spinning raw material, wherein the constant temperature stirring is 110-140° C., the stirring speed is 500-1000 r / min, and the temperature of the heating stirring is 220-230° C.;

[0021] Step 3, spinning the spinning raw materials to obtain high-flexibility and high-elasticity DTY.

[0022] It can be seen from the above description that the present invention has the following advantages:

[0023] 1. The present invention solves the problems of poor elasticity and general softness of existing DTY, and utilizes the synergistic effect of sorbitan fatty acid ester and castor oil polyoxyethylene ether to not only improve the elasticity of DTY, but also improve the flexibility of DTY and improve the hand feel.

[0024] 2. The present invention uses polyvinyl alcohol as a modifier to solve the surface inertia of wollastonite fiber. At the same time, polyvinyl alcohol and dopamine are combined to form a high molecular elastic structure to improve the elasticity of the surface of the inorganic filler, thereby achieving the purpose of improving the elasticity of DTY.

[0025] 3. The present invention utilizes polyvinyl alcohol and polydopamine to form polycondensation under the action of temperature, thereby achieving the synergistic electrostatic effect of the polyvinyl alcohol polycondensate and polydopamine, and solving the electrostatic problem of polyester fibers. DETAILED DESCRIPTION

[0026] The present invention is described in detail with reference to the embodiments, but no limitation is imposed on the claims of the present invention. Example 1

[0027] A highly flexible and elastic colored DTY, the mass ratio of which is:

[0028] 100 parts of polyethylene terephthalate, 2 parts of oil agent, 3 parts of modified inorganic filler, 0.1 parts of coupling agent, 1 part of masterbatch, and 0.2 parts of dispersant.

[0029] The oil agent is a mixture of sorbitan fatty acid ester and castor oil polyoxyethylene ether, and the mass ratio of sorbitan fatty acid ester to castor oil polyoxyethylene ether is 1:1.

[0030] The modified inorganic filler adopts polyvinyl alcohol modified wollastonite fiber, the polyvinyl alcohol modified wollastonite fiber has a polyvinyl alcohol condensation product as an outer shell, polydopamine as an adhesive conductive layer, and wollastonite fiber as a core, and the preparation method of the polyvinyl alcohol modified wollastonite fiber comprises the following steps: a1, adding the wollastonite fiber to an ethanol ether mixture for ultrasonic treatment for 20 minutes, taking it out and adding it to an ethanol aqueous solution for secondary ultrasonic treatment for 30 minutes, and drying to obtain clean wollastonite fiber, wherein the volume ratio of ethanol to ether in the ethanol ether mixture is 2: 1. The concentration of the wollastonite fiber in the ethanol-ether mixture is 100 g / L, the ultrasonic frequency of the ultrasonic treatment is 80 kHz, and the temperature is 5°C; the volume ratio of ethanol to water in the ethanol-water solution is 2:1, the ultrasonic frequency of the secondary ultrasound is 80 kHz, the temperature is 30°C, and the drying temperature is 100°C; a2. Spray hydrochloric acid on the surface of the wollastonite fiber, let it stand for 10 minutes, and then wash to obtain roughened wollastonite fiber, wherein the wollastonite fiber is needle-shaped wollastonite fiber, the pH of the hydrochloric acid is 5, and the spraying amount is 1 mL / cm 2 , the temperature of the standing is 10°C, and anhydrous ethanol is used for washing; a3, 3-aminopropyl triethoxysilane is added to ether and stirred evenly, wollastonite fiber is placed in ultrasound for 20 minutes, and the wollastonite is taken out and the pressure is reduced and allowed to stand to obtain the initial wollastonite, the mass ratio of the 3-aminopropyl triethoxysilane to the ether is 1:10, the concentration of the wollastonite fiber in the ether is 40g / L, the frequency of ultrasound is 70kHz, the temperature is 5°C, the pressure of the reduced pressure standing is 70% of the atmospheric pressure, and the standing atmosphere is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10 :1; a4, add dopamine into water, stir evenly, put into primary coated wollastonite fiber and stir at a constant speed for 1h, take out and dry the secondary coated wollastonite fiber at a constant temperature, the concentration of dopamine in water is 10g / L, the stirring speed is 300r / min, and the temperature of the constant temperature drying is 50℃; a5, add polyvinyl alcohol into water, stir evenly to form a dilute solution, and then spray it on the surface of the secondary coated wollastonite fiber, dry it at a constant temperature and sinter it to obtain polyvinyl alcohol modified wollastonite fiber, the concentration of polyvinyl alcohol in water is 100g / L, and the amount of the spray is 3mL / cm 2 The constant temperature drying temperature is 160°C; the sintering temperature is 255°C.

[0031] The coupling agent is N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane.

[0032] The masterbatch is magenta masterbatch.

[0033] The dispersant is zinc stearate.

[0034] The method for preparing the highly flexible and highly elastic colored DTY comprises the following steps:

[0035] Step 1, drying polyethylene terephthalate, then grinding it, and obtaining polyethylene terephthalate fine powder by secondary drying, wherein the drying temperature is 120° C., the grinding temperature is 30° C., the grinding pressure is 0.5 MPa, the secondary drying temperature is 120° C., and the time is 2 h;

[0036] Step 2, putting the oil into a reaction kettle and stirring at a constant temperature, and adding the modified inorganic filler, masterbatch and dispersant in sequence to form a premix, and then adding the coupling agent and polyethylene terephthalate fine powder and stirring at a high temperature to obtain a spinning raw material, wherein the constant temperature stirring is 110° C., the stirring speed is 500 r / min, and the temperature of the heating stirring is 220° C.;

[0037] Step 3, spinning the spinning raw materials to obtain high-flexibility and high-elasticity DTY. Example 2

[0038] A highly flexible and elastic colored DTY, the mass ratio of which is:

[0039] 110 parts of polyethylene terephthalate, 3 parts of oil agent, 5 parts of modified inorganic filler, 0.3 parts of coupling agent, 2 parts of masterbatch, and 0.4 parts of dispersant.

[0040] The oil agent is a mixture of sorbitan fatty acid ester and castor oil polyoxyethylene ether, and the mass ratio of sorbitan fatty acid ester to castor oil polyoxyethylene ether is 1:1.2.

[0041] The modified inorganic filler adopts polyvinyl alcohol modified wollastonite fiber, the polyvinyl alcohol modified wollastonite fiber has a polyvinyl alcohol condensation product as an outer shell, polydopamine as an adhesive conductive layer, and a wollastonite fiber as a core, and the preparation method of the polyvinyl alcohol modified wollastonite fiber comprises the following steps: a1, adding the wollastonite fiber to an ethanol ether mixture for ultrasonic treatment for 30 minutes, taking it out and adding it to an ethanol aqueous solution for a second ultrasonic treatment for 60 minutes, and drying to obtain clean wollastonite fiber, wherein the volume ratio of ethanol to ether in the ethanol ether mixture is 1:1 , the concentration of the wollastonite fiber in the ethanol ether mixture is 200g / L, the ultrasonic frequency of the ultrasonic treatment is 100kHz, and the temperature is 10°C; the volume ratio of ethanol to water in the ethanol aqueous solution is 5:1, the ultrasonic frequency of the secondary ultrasound is 100kHz, the temperature is 40°C, and the drying temperature is 120°C; a2, spraying hydrochloric acid on the surface of the wollastonite fiber, standing for 20 minutes and then washing to obtain roughened wollastonite fiber, the wollastonite fiber is needle-shaped wollastonite fiber, the pH of the hydrochloric acid is 6, and the spraying amount is 2mL / cm 2, the temperature of the standing is 20°C, and anhydrous ethanol is used for washing; a3, 3-aminopropyltriethoxysilane is added to ether and stirred evenly, wollastonite fiber is placed in ultrasound for 30 minutes, and the pressure is reduced and the wollastonite is allowed to stand after being taken out to obtain the initial plated wollastonite, the mass ratio of the 3-aminopropyltriethoxysilane to the ether is 1:20, the concentration of the wollastonite fiber in the ether is 90g / L, the frequency of ultrasound is 90kHz, the temperature is 10°C, the pressure of the decompression and standing is 80% of the atmospheric pressure, and the standing atmosphere is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 12 :1; a4, add dopamine to water, stir evenly, put into the primary coated wollastonite fiber and stir at a constant speed for 2h, take out and dry the secondary coated wollastonite fiber at a constant temperature, the concentration of dopamine in water is 30g / L, the stirring speed is 500r / min, and the temperature of the constant temperature drying is 60℃; a5, add polyvinyl alcohol to water, stir evenly to form a dilute solution, and then spray it on the surface of the secondary coated wollastonite fiber, dry it at a constant temperature and sinter it to obtain polyvinyl alcohol modified wollastonite fiber, the concentration of polyvinyl alcohol in water is 150g / L, and the amount of the spray is 5mL / cm 2 The constant temperature drying temperature is 170°C; the sintering temperature is 260°C.

[0042] The coupling agent is γ-methacryloxypropyltrimethoxysilane.

[0043] The masterbatch is cyan masterbatch.

[0044] The dispersant is zinc stearate.

[0045] The method for preparing the highly flexible and highly elastic colored DTY comprises the following steps:

[0046] Step 1, drying polyethylene terephthalate, then grinding it, and obtaining polyethylene terephthalate fine powder by secondary drying, wherein the drying temperature is 125° C., the grinding temperature is 50° C., the grinding pressure is 0.7 MPa, the secondary drying temperature is 130° C., and the time is 3 hours;

[0047] Step 2, putting the oil into a reaction kettle and stirring at a constant temperature, and adding the modified inorganic filler, masterbatch and dispersant in sequence to form a premix, and then adding the coupling agent and polyethylene terephthalate fine powder and stirring at a high temperature to obtain a spinning raw material, wherein the constant temperature stirring is 140° C., the stirring speed is 1000 r / min, and the temperature of the heating stirring is 230° C.;

[0048] Step 3, spinning the spinning raw materials to obtain high-flexibility and high-elasticity DTY. Example 3

[0049] A highly flexible and elastic colored DTY, the mass ratio of which is:

[0050] 105 parts of polyethylene terephthalate, 3 parts of oil agent, 4 parts of modified inorganic filler, 0.2 parts of coupling agent, 2 parts of masterbatch, and 0.3 parts of dispersant.

[0051] The oil agent is a mixture of sorbitan fatty acid ester and castor oil polyoxyethylene ether, and the mass ratio of sorbitan fatty acid ester to castor oil polyoxyethylene ether is 1:1.1.

[0052] The modified inorganic filler adopts polyvinyl alcohol modified wollastonite fiber, the polyvinyl alcohol modified wollastonite fiber has a polyvinyl alcohol condensation product as an outer shell, polydopamine as an adhesive conductive layer, and wollastonite fiber as a core, and the preparation method of the polyvinyl alcohol modified wollastonite fiber comprises the following steps: a1, adding the wollastonite fiber to an ethanol ether mixture and ultrasonically treating it for 25 minutes, taking it out and adding it to an ethanol aqueous solution for a second ultrasonic treatment for 50 minutes, and drying to obtain clean wollastonite fiber, wherein the volume ratio of ethanol to ether in the ethanol ether mixture is 2: 1. The concentration of the wollastonite fiber in the ethanol-ether mixture is 150 g / L, the ultrasonic frequency of the ultrasonic treatment is 90 kHz, and the temperature is 8°C; the volume ratio of ethanol to water in the ethanol-water solution is 4:1, the ultrasonic frequency of the secondary ultrasound is 90 kHz, the temperature is 35°C, and the drying temperature is 110°C; a2. Spray hydrochloric acid on the surface of the wollastonite fiber, let it stand for 15 minutes, and then wash to obtain roughened wollastonite fiber, wherein the wollastonite fiber is needle-shaped wollastonite fiber, the pH of the hydrochloric acid is 6, and the spraying amount is 2 mL / cm 2 , the temperature of the standing is 15°C, and anhydrous ethanol is used for washing; a3, 3-aminopropyltriethoxysilane is added to ether and stirred evenly, wollastonite fiber is placed in ultrasound for 25 minutes, and then the pressure is reduced and the wollastonite is allowed to stand to obtain the initial coating wollastonite, the mass ratio of 3-aminopropyltriethoxysilane to ether is 1:15, the concentration of wollastonite fiber in ether is 70g / L, the frequency of ultrasound is 80kHz, the temperature is 8°C, the pressure of the reduced pressure standing is 75% of the atmospheric pressure, and the standing atmosphere is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 1:11 :1; a4, add dopamine into water, stir evenly, put into the primary coated wollastonite fiber and stir at a constant speed for 2h, take out and dry the secondary coated wollastonite fiber at a constant temperature, the concentration of dopamine in water is 20g / L, the stirring speed is 400r / min, and the temperature of the constant temperature drying is 55°C; a5, add polyvinyl alcohol into water, stir evenly to form a dilute solution, and then spray it on the surface of the secondary coated wollastonite fiber, dry it at a constant temperature and sinter it to obtain polyvinyl alcohol modified wollastonite fiber, the concentration of polyvinyl alcohol in water is 130g / L, and the amount of the spray is 4mL / cm 2 The constant temperature drying temperature is 165°C; the sintering temperature is 255°C.

[0053] The coupling agent is N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane.

[0054] The masterbatch is yellow masterbatch.

[0055] The dispersant is zinc stearate.

[0056] The method for preparing the highly flexible and highly elastic colored DTY comprises the following steps:

[0057] Step 1, drying polyethylene terephthalate, then grinding it, and obtaining polyethylene terephthalate fine powder by secondary drying, wherein the drying temperature is 125° C., the grinding temperature is 40° C., the grinding pressure is 0.6 MPa, the secondary drying temperature is 125° C., and the time is 2 h;

[0058] Step 2, putting the oil into a reaction kettle and stirring at a constant temperature, and adding the modified inorganic filler, masterbatch and dispersant in sequence to form a premix, and then adding the coupling agent and polyethylene terephthalate fine powder and stirring at a high temperature to obtain a spinning raw material, wherein the constant temperature stirring is 130° C., the stirring speed is 800 r / min, and the temperature of the heating stirring is 225° C.;

[0059] Step 3, spinning the spinning raw materials to obtain high-flexibility and high-elasticity DTY.

[0060] Comparative Example 1

[0061] A highly flexible and elastic colored DTY, the mass ratio of which is:

[0062] 105 parts of polyethylene terephthalate, 3 parts of oil agent, 4 parts of inorganic filler, 0.2 parts of coupling agent, 2 parts of masterbatch, and 0.3 parts of dispersant.

[0063] The oil agent is a mixture of sorbitan fatty acid ester and castor oil polyoxyethylene ether, and the mass ratio of sorbitan fatty acid ester to castor oil polyoxyethylene ether is 1:1.1.

[0064] The inorganic filler is wollastonite fiber.

[0065] The coupling agent is N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane.

[0066] The masterbatch is yellow masterbatch.

[0067] The dispersant is zinc stearate.

[0068] The method for preparing the highly flexible and highly elastic colored DTY comprises the following steps:

[0069] Step 1, drying polyethylene terephthalate, then grinding it, and obtaining polyethylene terephthalate fine powder by secondary drying, wherein the drying temperature is 125° C., the grinding temperature is 40° C., the grinding pressure is 0.6 MPa, the secondary drying temperature is 125° C., and the time is 2 h;

[0070] Step 2, putting the oil into a reaction kettle and stirring at a constant temperature, and adding inorganic filler, masterbatch and dispersant in sequence to form a premix, and then adding coupling agent and polyethylene terephthalate fine powder and stirring at a high temperature to obtain a spinning raw material, wherein the constant temperature stirring is 130° C., the stirring speed is 800 r / min, and the temperature of the heating stirring is 225° C.;

[0071] Step 3, spinning the spinning raw materials to obtain high-flexibility and high-elasticity DTY.

[0072] Comparative Example 2

[0073] A highly flexible and elastic colored DTY, the mass ratio of which is:

[0074] 105 parts of polyethylene terephthalate, 3 parts of oil agent, 4 parts of inorganic filler, 0.2 parts of coupling agent, 2 parts of masterbatch, and 0.3 parts of dispersant.

[0075] The oil agent adopts sorbitan fatty acid ester.

[0076] The inorganic filler is wollastonite fiber.

[0077] The coupling agent is N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane.

[0078] The masterbatch is yellow masterbatch.

[0079] The dispersant is zinc stearate.

[0080] The method for preparing the highly flexible and highly elastic colored DTY comprises the following steps:

[0081] Step 1, drying polyethylene terephthalate, then grinding it, and obtaining polyethylene terephthalate fine powder by secondary drying, wherein the drying temperature is 125° C., the grinding temperature is 40° C., the grinding pressure is 0.6 MPa, the secondary drying temperature is 125° C., and the time is 2 h;

[0082] Step 2, putting the oil into a reaction kettle and stirring at a constant temperature, and adding inorganic filler, masterbatch and dispersant in sequence to form a premix, and then adding coupling agent and polyethylene terephthalate fine powder and stirring at a high temperature to obtain a spinning raw material, wherein the constant temperature stirring is 130° C., the stirring speed is 800 r / min, and the temperature of the heating stirring is 225° C.;

[0083] Step 3, spinning the spinning raw materials to obtain high-flexibility and high-elasticity DTY.

[0084] Comparative Example 3

[0085] A highly flexible and elastic colored DTY, the mass ratio of which is:

[0086] 105 parts of polyethylene terephthalate, 3 parts of oil agent, 4 parts of inorganic filler, 0.2 parts of coupling agent, 2 parts of masterbatch, and 0.3 parts of dispersant.

[0087] The oil agent is castor oil polyoxyethylene ether.

[0088] The inorganic filler is wollastonite fiber.

[0089] The coupling agent is N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane.

[0090] The masterbatch is yellow masterbatch.

[0091] The dispersant is zinc stearate.

[0092] The method for preparing the highly flexible and highly elastic colored DTY comprises the following steps:

[0093] Step 1, drying polyethylene terephthalate, then grinding it, and obtaining polyethylene terephthalate fine powder by secondary drying, wherein the drying temperature is 125° C., the grinding temperature is 40° C., the grinding pressure is 0.6 MPa, the secondary drying temperature is 125° C., and the time is 2 h;

[0094] Step 2, putting the oil into a reaction kettle and stirring at a constant temperature, and adding inorganic filler, masterbatch and dispersant in sequence to form a premix, and then adding coupling agent and polyethylene terephthalate fine powder and stirring at a high temperature to obtain a spinning raw material, wherein the constant temperature stirring is 130° C., the stirring speed is 800 r / min, and the temperature of the heating stirring is 225° C.;

[0095] Step 3, spinning the spinning raw materials to obtain high-flexibility and high-elasticity DTY.

[0096] Performance Testing

[0097] The products of Examples 1-3 and Comparative Examples 1-3 were used as samples to conduct flexibility and elasticity tests, and the results are as follows:

[0098] (1) Flexibility testing

[0099] For each test sample, three 50mm parallel samples are randomly cut, and a 30mm length segment is marked in the middle section of the parallel sample in the length direction. The two marked points of the parallel sample are clamped on the upper and lower clamps of the electronic single fiber strength tester. The upper and lower clamps are adjusted to make the parallel samples vertical. The samples are stretched at 5mm / min to obtain the load-stretch curve. The slope at an elongation of 1% is taken as the initial modulus.

[0100] (2) Elasticity test

[0101] For each test sample, three 70cm parallel samples are randomly cut, the upper end is fixed, and a mark is made at 50cm below the upper end of the parallel sample, and a 2g weight is fixed at the lower end; when the 50cm mark point moves downward by 1.5cm, the weight is supported by a support block so that the 50cm mark point is stabilized in the downward position. After keeping it for 3min, the weight is removed, and the distance L between the upper end and the 50cm mark point is measured after the parallel sample recovers for 30s.

[0102] Table 1 Elasticity test

[0103] Initial modulus N / tex Rebound rate% Example 1 3.95 99.8 Example 2 3.92 100 Example 3 3.93 99.9 Comparative Example 1 4.23 98.1 Comparative Example 2 4.32 96.6 Comparative Example 3 4.58 97.5

[0104] As shown in Table 1, the modified inorganic filler in the technical solution uses polyvinyl alcohol and polydopamine to form a polymer elastic structure, which not only improves the overall flexibility, but also can form a good rebound effect. At the same time, the oil agent composed of dehydrated sorbitan fatty acid ester and castor oil polyoxyethylene ether improves the performance of DTY from the elasticity and flexibility respectively.

[0105] It is understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A highly flexible and elastic colored DTY, characterized by: The mass ratio is: 100-110 parts of polyethylene terephthalate, 2-3 parts of oil agent, 3-5 parts of modified inorganic filler, 0.1-0.3 parts of coupling agent, 1-2 parts of masterbatch, 0.2-0.4 parts of dispersant; The oil agent is a mixture of sorbitan fatty acid ester and castor oil polyoxyethylene ether; The modified inorganic filler is polyvinyl alcohol-modified wollastonite fiber, and the polyvinyl alcohol-modified wollastonite fiber has a polyvinyl alcohol condensation product as an outer shell, polydopamine as an adhesive conductive layer, and wollastonite fiber as an inner core; The preparation method of the polyvinyl alcohol modified wollastonite fiber comprises the following steps: a1, adding the wollastonite fiber to an ethanol ether mixed solution for ultrasonic treatment for 20-30 minutes, taking out and adding the fiber to an ethanol aqueous solution for secondary ultrasonic treatment for 30-60 minutes, and drying to obtain clean wollastonite fiber, wherein the volume ratio of ethanol to ether in the ethanol ether mixed solution is 2:1-2, the concentration of the wollastonite fiber in the ethanol ether mixed solution is 100-200 g / L, the ultrasonic frequency of the ultrasonic treatment is 80-100 kHz, and the temperature is 5-10° C.; the volume ratio of ethanol to water in the ethanol aqueous solution is 2-5:1, the ultrasonic frequency of the secondary ultrasonic treatment is 80-100 kHz, and the temperature is 30-40° C., and the drying temperature is 100-120° C.; a2, spray hydrochloric acid on the surface of wollastonite fiber, let it stand for 10-20 minutes and then wash to obtain roughened wollastonite fiber, wherein the wollastonite fiber is needle-shaped wollastonite fiber, the pH of the hydrochloric acid is 5-6, and the spraying amount is 1-2 mL / cm 2 , the standing temperature is 10-20°C, and the washing is done with anhydrous ethanol; a3, adding 3-aminopropyltriethoxysilane to diethyl ether and stirring evenly, placing wollastonite fiber in the fiber and ultrasonicating for 20-30 min, taking it out and reducing the pressure to stand to obtain initially plated wollastonite, the mass ratio of 3-aminopropyltriethoxysilane to diethyl ether is 1:10-20, the concentration of wollastonite fiber in diethyl ether is 40-90 g / L, the frequency of ultrasound is 70-90 kHz, the temperature is 5-10° C., the pressure of the reduced pressure standing is 70-80% of the atmospheric pressure, the standing atmosphere is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10-12:1; a4, adding dopamine to water and stirring evenly, and then putting the primary coated wollastonite fiber into the water and stirring at a constant speed for 1-2 hours, taking it out and drying the secondary coated wollastonite fiber at a constant temperature, wherein the concentration of dopamine in water is 10-30 g / L, the stirring speed is 300-500 r / min, and the temperature of the constant temperature drying is 50-60°C; a5, adding polyvinyl alcohol to water and stirring evenly to form a dilute solution, and then spraying it on the surface of the secondary coated wollastonite fiber, drying at a constant temperature and sintering to obtain polyvinyl alcohol modified wollastonite fiber, wherein the concentration of the polyvinyl alcohol in water is 100-150 g / L, and the amount of the spray is 3-5 mL / cm 2 The constant temperature drying temperature is 160-170°C; the sintering temperature is 255-260°C.

2. The highly flexible and elastic colored DTY according to claim 1, characterized in that: The mass ratio of the sorbitan fatty acid ester to the castor oil polyoxyethylene ether is 1:1-1.

2.

3. The highly flexible and elastic colored DTY according to claim 1, characterized in that: The coupling agent is N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane or γ-methacryloxypropyltrimethoxysilane.

4. The highly flexible and elastic colored DTY according to claim 1, characterized in that: The masterbatch is one or more of magenta masterbatch, cyan masterbatch and yellow masterbatch.

5. The highly flexible and elastic colored DTY according to claim 1, characterized in that: The dispersant is zinc stearate.

6. The highly flexible and highly elastic colored DTY according to claim 1, characterized in that: The method for preparing the highly flexible and highly elastic colored DTY comprises the following steps: Step 1, drying polyethylene terephthalate, then grinding it, and then drying it twice to obtain polyethylene terephthalate fine powder; Step 2, putting the oil into a reaction kettle and stirring at a constant temperature, and sequentially adding the modified inorganic filler, masterbatch and dispersant to form a premix, and then adding the coupling agent and polyethylene terephthalate fine powder and stirring at a high temperature to obtain a spinning raw material; Step 3, spinning the spinning raw materials to obtain high-flexibility and high-elasticity DTY.

7. The highly flexible and elastic colored DTY according to claim 6, characterized in that: The drying temperature in step 1 is 120-125° C., the grinding temperature is 30-50° C., the grinding pressure is 0.5-0.7 MPa, and the secondary drying temperature is 120-130° C. for 2-3 hours.

8. The highly flexible and highly elastic colored DTY according to claim 6, characterized in that: The constant temperature stirring in step 2 is 110-140°C, the stirring speed is 500-1000r / min, and the temperature of the heating stirring is 220-230°C.