Preparation process for regenerating moisture-absorbing and heat-generating polyester fibers by chemical method

Abstract

The invention discloses a preparation process for regenerating moisture-absorbing and heating polyester fibers by a chemical method, and belongs to the technical field of synthetic fibers. The preparation process comprises the following steps: (1) crystallizing and drying regenerated semi-dull polyester chips, and adding moisture-absorbing and heating master batches into a master batch drying device for drying; (2) conveying the dried regenerated semi-dull polyester chips and moisture-absorbing and heating master batches into a master batch machine according to a required ratio, and blending to obtain a premix; (3) conveying the premix to a screw extruder for melt blending to form a spinning melt, then conveying the melt to a spinning manifold, metering the melt through a metering pump, and extruding the melt through a spinning assembly to form a primary tow; and (4) carrying out post-heating, side blowing cooling, bundling and oiling treatment on the primary tows, and then carrying out pre-interlacing, drafting and sizing by a drafting roller, main interlacing and winding treatment to obtain the chemically regenerated moisture-absorbing and heating polyester fibers. The obtained fiber has good moisture absorption and heating performance, and the heat retention property and wearing comfort of the fiber are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of synthetic fibers, and more specifically to a preparation process of chemically regenerated hygroscopic and heat-generating polyester fibers. Background Art

[0002] Chemically recycled polyester fiber technology is an innovative textile material technology that aims to reduce environmental pollution and energy consumption by recycling and reusing waste textiles and other resources. However, the structural characteristics of recycled polyester fibers also determine that their hygroscopicity is relatively poor, which makes the breathability and comfort of polyester fibers poor, especially in humid and cold environments. After absorbing moisture, the fibers tend to stick to the skin surface, making people feel even more damp and cold. Although current hygroscopic fibers can improve hygroscopicity to a certain extent, they often cannot take into account the mechanical properties of the fibers at the same time. Therefore, improving the hygroscopic and heat-generating properties of recycled polyester fibers while taking into account their mechanical properties is of great significance for expanding the scope of fiber use and increasing the added value of its products. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a preparation process for chemically regenerated hygroscopic and heat-generating polyester fibers. The obtained fibers have good hygroscopic and heat-generating properties and enhance the warmth retention and wearing comfort of the fibers.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A preparation process for chemically regenerated hygroscopic and heat-generating polyester fiber comprises the following steps:

[0006] (1) performing crystallization and drying treatment on the regenerated semi-dull polyester chips, and adding the hygroscopic and exothermic masterbatch into a masterbatch drying device for drying;

[0007] (2) conveying the dried recycled semi-matt polyester chips and the hygroscopic exothermic masterbatch to a masterbatch machine for blending according to a required ratio to obtain a premix;

[0008] (3) conveying the premix to a screw extruder for melt blending to form a spinning melt, and then conveying the melt to a spinning manifold, metering it through a metering pump, and extruding it through a spinning assembly to form a primary filament bundle;

[0009] (4) The nascent filament bundle is subjected to post-heating, side-blowing cooling, bundling and oiling treatment, and then to pre-network, drafting roller drafting and shaping, main network, and winding treatment to obtain chemically regenerated hygroscopic and heat-generating polyester fibers.

[0010] The present invention is further configured that the hygroscopic and exothermic masterbatch is prepared by mixing nano lithium nitrate and PET slices, and the content of nano lithium nitrate in the hygroscopic and exothermic masterbatch is 3-6wt%.

[0011] The present invention is further configured that the intrinsic viscosity of the hygroscopic heat-generating masterbatch is 0.60-0.66 dL / g, the melt index is 10 g / 10 min, and the density is 40 g / cm 3 .

[0012] The present invention is further configured as follows: in step (1), the crystallization temperature of the regenerated semi-dull polyester chips is 155-160°C, the drying temperature is 160-165°C, and the drying wind pressure is 0.11-0.13Mpa; the drying temperature of the hygroscopic and exothermic masterbatch is 98-102°C, and the drying time is 9-11h.

[0013] The present invention is further configured such that, in step (2), the content of the hygroscopic and exothermic masterbatch in the premix is ​​1-1.5 wt %.

[0014] The present invention is further configured as follows: in step (3), the screw extrusion diameter is 120 mm, the aspect ratio is 30, there are 5 heating zones, and the temperatures of the heating zones are: zone 1 275-280°C, zone 2 278-283°C, zone 3 280-285°C, zone 4 280-285°C, zone 5 285-290°C; the extrusion pressure of the screw extruder is 12-14Mpa, and the pressure after filtration is 8.8-9.5Mpa.

[0015] The present invention is further configured such that, in step (3), the temperature of the spinning manifold is 280-290° C., and the pump supply of the metering pump is 112-117 g / min.

[0016] The present invention is further configured as follows: in step (4), the post-heating temperature is 228-232° C., the assembly pressure is 14.9-15.7 MPa, the side blowing wind speed is 0.7-0.8 m / s; the oil nozzle height for cluster oiling is 1150 mm, the distance between the cluster guide wire hook and the oil nozzle is 250 mm, and the concentration ratio of the oil agent is 14%.

[0017] The present invention is further configured as follows: in step (4), the pressure of the pre-network is 0.12-0.17Mpa; in the stretching and shaping, the speed of the first stretching roller is 2050-2100m / min, the temperature is 85°C, the speed of the second stretching roller is 2050-2100m / min, the temperature is 85°C, the speed of the third stretching roller is 5000-5050m / min, the temperature is 120°C, and the speed of the fourth stretching roller is 5030-5080m / min; the main network pressure is 0.4-0.45Mpa; the winding speed is 4900-5100m / min, and the winding tension is 34-36cN.

[0018] In summary, the present invention has the following beneficial effects:

[0019] The fiber of the present invention can efficiently absorb moisture discharged by the human body or water vapor in the air by adding the hygroscopic and heat-generating masterbatch, and convert the moisture into thermal energy, release heat, achieve a warming effect, improve the hygroscopic and heat-generating performance of the fiber, and enhance the warmth retention and wearing comfort of the fiber. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The preparation process of the chemically regenerated hygroscopic and heat-generating polyester fiber of the present invention comprises the following steps:

[0022] (1) Add the regenerated semi-dull polyester chips into the crystallization drying system for crystallization drying treatment (crystallization temperature is 155-160°C, drying temperature is 160-165°C, and drying wind pressure is 0.11-0.13Mpa), and add the hygroscopic and exothermic masterbatch into the masterbatch drying device for drying (drying temperature is 98-102°C, and drying time is 9-11h).

[0023] The hygroscopic exothermic masterbatch is prepared by mixing nano lithium nitrate and PET slices. The content of nano lithium nitrate in the hygroscopic exothermic masterbatch is 3-6wt%. The specific preparation method is: the nano lithium nitrate and PET slices are mixed and then injected into a screw extruder and extruded and granulated at 270-280°C; the intrinsic viscosity of the hygroscopic exothermic masterbatch is 0.60-0.66dL / g, the melt index is 10g / 10min, and the density is 40g / cm 3 .

[0024] (2) The dried recycled semi-matt polyester chips and hygroscopic heat-generating masterbatch are conveyed to a masterbatch machine for blending according to the required ratio, and the content of the hygroscopic heat-generating masterbatch in the premix is ​​1-1.5wt%; or the dried recycled semi-matt polyester chips, hygroscopic heat-generating masterbatch, toughening agent (preferably the ultra-high performance toughening agent SC-8828 purchased from Shenzhen Materials Technology Co., Ltd.), and anti-ultraviolet agent (preferably the ultraviolet absorber GA403 purchased from Guangdong Keyou Material Technology Co., Ltd., which is a new type of ultraviolet light shielding agent derived from natural vanillin) are conveyed to a masterbatch machine for blending according to the required ratio to obtain a premix, wherein the content of the hygroscopic heat-generating masterbatch in the premix is ​​1-1.5wt%, the toughening agent accounts for 0.8-2wt% of the total mass of the premix, and the anti-ultraviolet agent accounts for 0.5-1.7wt% of the total mass of the premix.

[0025] (3) The premix is ​​conveyed to a screw extruder for melt blending to form a spinning melt, and then the melt is conveyed to a spinning manifold, and after being metered by a metering pump, it is extruded through a spinning assembly to form a primary filament bundle. The screw extrusion diameter is 120 mm, the aspect ratio is 30, and there are 5 heating zones, the temperatures of each heating zone are: zone 1 275-280°C, zone 2 278-283°C, zone 3 280-285°C, zone 4 280-285°C, zone 5 285-290°C; the extrusion pressure of the screw extruder is 12-14Mpa, and the pressure after filtration is 8.8-9.5Mpa; the temperature of the spinning manifold is 280-290°C, and the pump supply of the metering pump is 112-117g / min.

[0026] (4) The nascent filaments are subjected to post-heating, side-blowing cooling, bundling and oiling treatment, and then to pre-networking, drafting roller drafting and shaping, main network, and winding treatment to obtain chemically regenerated hygroscopic and heat-generating polyester fibers. The post-heating temperature is 228-232°C, the assembly pressure is 14.9-15.7 MPa, and the side-blowing wind speed is 0.7-0.8 m / s; the bundling oiling nozzle height is 1150 mm, the distance between the bundling guide hook and the oil nozzle is 250 mm, and the oil concentration ratio is 14%. The pressure of the pre-network is 0.12-0.17Mpa; during the stretching and shaping, the speed of the first stretching roller is 2050-2100m / min, the temperature is 85℃, the speed of the second stretching roller is 2050-2100m / min, the temperature is 85℃, the speed of the third stretching roller is 5000-5050m / min, the temperature is 120℃, and the speed of the fourth stretching roller is 5030-5080m / min; the main network pressure is 0.4-0.45Mpa; the winding speed is 4900-5100m / min, and the winding tension is 34-36cN.

[0027] Preferred embodiment 1

[0028] (1) Adding the regenerated semi-dull polyester chips into the crystallization drying system for crystallization drying treatment (crystallization temperature is 158°C, drying temperature is 163°C, and drying air pressure is 0.12 MPa), and adding the hygroscopic and exothermic masterbatch into the masterbatch drying device for drying (drying temperature is 100°C, and drying time is 10 hours);

[0029] The preparation method of the hygroscopic exothermic masterbatch is as follows: the nano lithium nitrate is mixed with PET slices, injected into a screw extruder, and extruded and granulated at 270-280°C; the intrinsic viscosity of the hygroscopic exothermic masterbatch is 0.63dL / g, the melt index is 10g / 10min, and the density is 40g / cm 3 The content of nano lithium nitrate in the hygroscopic and exothermic masterbatch is 6wt%.

[0030] (2) conveying the dried recycled semi-matt polyester chips and the hygroscopic and exothermic masterbatch to a masterbatch machine according to a required ratio for blending to obtain a premix; the content of the hygroscopic and exothermic masterbatch in the premix is ​​1.2 wt %;

[0031] (3) The premix is ​​conveyed to a screw extruder for melt blending to form a spinning melt, and then the melt is conveyed to a spinning manifold, metered by a metering pump, and then extruded through a spinning assembly to form a primary filament bundle; the screw extrusion diameter is 120 mm, the aspect ratio is 30, and there are 5 heating zones, the temperatures of each heating zone are: zone 1 278°C, zone 2 280°C, zone 3 282°C, zone 4 284°C, zone 5 286°C; the extrusion pressure of the screw extruder is 13.5 MPa, and the pressure after filtration is 9.1 MPa; the temperature of the spinning manifold is 284°C, and the pump supply of the metering pump is 115 g / min.

[0032] (4) The spun filaments were subjected to post-heating, side-blowing cooling, bundling and oiling treatment, and then to pre-network, drafting roller drafting and shaping, main network, and winding to obtain chemically regenerated hygroscopic and heat-generating polyester fibers with a linear density of 230 dtex. The post-heating temperature was 230°C, the assembly pressure was 15.2 MPa, and the side-blowing wind speed was 0.75 m / s; the bundling oiling nozzle height was 1150 mm, the distance between the bundling guide hook and the oil nozzle was 250 mm, and the oil concentration ratio was 14%. The pressure of the pre-network is 0.15Mpa; during stretching and shaping, the speed of the first stretching roller is 2080m / min, the temperature is 85℃, the speed of the second stretching roller is 2085m / min, the temperature is 85℃, the speed of the third stretching roller is 5020m / min, the temperature is 120℃, and the speed of the fourth stretching roller is 5050m / min; the main network pressure is 0.42Mpa; the winding speed is 5000m / min, and the winding tension is 35cN.

[0033] Example 2

[0034] The chemically regenerated hygroscopic and heat-generating polyester fiber was prepared according to the method of Example 1, except that step (2) was changed to: the dried regenerated semi-matt polyester chips, hygroscopic and heat-generating masterbatch, high-performance toughening agent SC-8828, and ultraviolet absorber GA403 were transported to a masterbatch machine in a required ratio for blending to obtain a premix; the content of the hygroscopic and heat-generating masterbatch in the premix was 1-1.5wt%; the toughening agent accounted for 0.8wt% of the total mass of the premix, and the anti-ultraviolet agent accounted for 0.62wt% of the total mass of the premix.

[0035] Comparative Example 1

[0036] The chemically regenerated hygroscopic and heat-generating polyester fiber was prepared according to the method of Example 2, but without adding the high-performance toughening agent SC-8828.

[0037] Comparative Example 2

[0038] The chemically regenerated hygroscopic and heat-generating polyester fiber was prepared according to the method of Example 2, but without adding the ultraviolet absorber GA403.

[0039] Comparative Example 3

[0040] The chemically regenerated hygroscopic and heat-generating polyester fiber was prepared according to the method of Example 2, except that the high-performance toughening agent SC-8828 was replaced by the toughening agent ST-2000.

[0041] Comparative Example 4

[0042] The chemically regenerated hygroscopic and heat-generating polyester fiber was prepared according to the method of Example 2, except that the ultraviolet absorber GA403 was replaced by the ultraviolet absorber UV-P.

[0043] The test results of the fiber properties prepared by Example 1-Example 2 and Comparative Example 1-Comparative Example 4 are as follows:

[0044]

[0045]

[0046] From the data in the table, it can be seen that the method of the present invention can successfully prepare recycled polyester fibers with moisture absorption and heat generation properties, which can improve the warmth retention and wearing comfort of the fibers. Moreover, when high-performance toughening agent SC-8828 and ultraviolet absorber GA403 are added, the toughness and anti-ultraviolet performance of the fibers can be further improved, and the wear resistance can also be greatly improved. The high-performance toughening agent SC-8828 and ultraviolet absorber GA403 have a synergistic effect.

[0047] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A preparation process for chemically regenerated hygroscopic and heat-generating polyester fiber, characterized in that: The following steps are involved: (1) performing a crystallization and drying treatment on the regenerated semi-dull polyester chips, and adding the hygroscopic and exothermic masterbatch into a masterbatch drying device for drying; (2) conveying the dried recycled semi-matt polyester chips and the hygroscopic exothermic masterbatch to a masterbatch machine for blending according to a required ratio to obtain a premix; (3) conveying the premix to a screw extruder for melt blending to form a spinning melt, and then conveying the melt to a spinning manifold, metering it through a metering pump, and extruding it through a spinning assembly to form a primary filament bundle; (4) The nascent filament bundle is subjected to post-heating, side-blowing cooling, bundling and oiling treatment, and then to pre-network, drafting roller drafting and shaping, main network, and winding treatment to obtain chemically regenerated hygroscopic and heat-generating polyester fibers.

2. The process for preparing a chemically regenerated hygroscopic and heat-generating polyester fiber according to claim 1, characterized in that: The hygroscopic and exothermic masterbatch is prepared by mixing nano lithium nitrate and PET slices, and the content of nano lithium nitrate in the hygroscopic and exothermic masterbatch is 3-6wt%.

3. The process for preparing a chemically regenerated hygroscopic and heat-generating polyester fiber according to claim 1, characterized in that: The intrinsic viscosity of the hygroscopic and exothermic masterbatch is 0.60-0.66dL / g, the melt index is 10g / 10min, and the density is 40g / cm 3 .

4. The process for preparing a chemically regenerated hygroscopic and heat-generating polyester fiber according to claim 1, characterized in that: In step (1), the crystallization temperature of the regenerated semi-dull polyester chips is 155-160° C., the drying temperature is 160-165° C., and the drying wind pressure is 0.11-0.13 MPa; the drying temperature of the hygroscopic exothermic masterbatch is 98-102° C., and the drying time is 9-11 h.

5. The process for preparing the chemically regenerated hygroscopic and heat-generating polyester fiber according to claim 1, characterized in that: In step (2), the content of the hygroscopic and exothermic masterbatch in the premix is ​​1-1.5 wt %.

6. The process for preparing the chemically regenerated hygroscopic and heat-generating polyester fiber according to claim 1, characterized in that: In step (3), the screw extrusion diameter is 120 mm, the aspect ratio is 30, there are 5 heating zones, and the temperatures of the heating zones are: zone 1 275-280°C, zone 2 278-283°C, zone 3 280-285°C, zone 4 280-285°C, zone 5 285-290°C; the extrusion pressure of the screw extruder is 12-14 MPa, and the pressure after filtration is 8.8-9.5 MPa.

7. The process for preparing the chemically regenerated hygroscopic and heat-generating polyester fiber according to claim 1, characterized in that: In step (3), the temperature of the spinning manifold is 280-290° C., and the pump supply of the metering pump is 112-117 g / min.

8. The process for preparing chemically regenerated hygroscopic and heat-generating polyester fiber according to claim 1, characterized in that: In step (4), the post-heating temperature is 228-232° C., the assembly pressure is 14.9-15.7 MPa, the side blowing wind speed is 0.7-0.8 m / s; the nozzle height of the cluster oiling is 1150 mm, the distance between the cluster wire guide hook and the nozzle is 250 mm, and the concentration ratio of the oil agent is 14%.

9. The process for preparing chemically regenerated hygroscopic and heat-generating polyester fiber according to claim 1, characterized in that: In step (4), the pressure of the pre-network is 0.12-0.17Mpa; during the drawing and shaping, the speed of the first drawing roller is 2050-2100m / min, the temperature is 85°C, the speed of the second drawing roller is 2050-2100m / min, the temperature is 85°C, the speed of the third drawing roller is 5000-5050m / min, the temperature is 120°C, and the speed of the fourth drawing roller is 5030-5080m / min; the main network pressure is 0.4-0.45Mpa; the winding speed is 4900-5100m / min, and the winding tension is 34-36cN.

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