Preparation method of porous fiber with wool-like curly structure

Abstract

The present invention discloses a method for preparing porous fibers with a wool-like curly structure, belonging to the technical field of synthetic fibers. The method comprises the following steps: a) mixing polyester chips with carvacrol, a silicone additive, and a toughening agent to obtain a core premix; and b) mixing the polyester chips with nano-calcium carbonate, carvacrol, a silicone additive, and a toughening agent to obtain a skin premix; and c) melting the core premix and the skin premix separately, and then injecting them into a composite spinning assembly for spinning to obtain a hollow core-skin composite spun yarn. b) subjecting the hollow core-skin composite spun yarn to side-blowing cooling, preliminary drafting, citric acid impregnation, water washing, and drying to obtain a surface porous fiber. c) subjecting the surface porous fiber to directional hot blowing, cooling and shaping, oiling, web-interlacing, re-drafting, and winding to obtain a porous fiber with a wool-like curly structure. The fiber obtained by the present invention has high warmth retention, high flexibility, and anti-pilling effects, and can meet higher usage requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of synthetic fibers, and more particularly to a method for preparing porous fibers with a wool-like curled structure. Background Art

[0002] With the development of the polyester fiber industry, the differentiation rate of polyester fibers has continued to increase, and textile fabrics have undergone significant changes in terms of feel, drape, comfort, and appearance. As living standards improve, people have increasingly higher expectations for textile fabrics, and imitation fabrics have emerged. Imitation wool fabric is currently the most commonly used imitation fabric. However, the warmth retention of currently available imitation wool curly fibers is not ideal, and they still have shortcomings such as poor softness and susceptibility to pilling, making them difficult to meet higher usage requirements. 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 method for preparing porous fibers with a wool-like curly structure. The obtained fibers have high warmth retention, high flexibility and better anti-pilling effect, meeting higher usage requirements.

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

[0005] A method for preparing porous fibers with a wool-like curly structure comprises the following steps:

[0006] a. Evenly mixing polyester chips with carvacrol, silicone additives, and toughening agents to obtain a core layer premix; evenly mixing polyester chips with nano-calcium carbonate, carvacrol, silicone additives, and toughening agents to obtain a skin layer premix; melting the core layer premix and the skin layer premix separately through a two-screw extruder, and then injecting the core layer melt and the skin layer melt into a composite spinning assembly for spinning to obtain a hollow skin-core composite spun yarn;

[0007] b. subjecting the hollow core-sheath composite spun yarn obtained in step a to side-blown cooling and preliminary drawing treatment, and then impregnating the fiber with citric acid, washing with water, and drying to obtain a surface porous fiber;

[0008] c. The surface porous fibers obtained in step b are subjected to directional hot blowing, cooling and shaping, oiling, networking, re-stretching, and winding treatments to obtain porous fibers with a wool-like curly structure.

[0009] The present invention is further configured such that the silicone additive is a modified silicone additive VANSLP S5056.

[0010] The present invention is further configured such that the toughening agent is an olefin elastomer containing a glycidyl methacrylate functional group.

[0011] The present invention is further configured such that the toughening agent is toughening agent ST 2020.

[0012] The present invention is further configured such that, in step a, the mass ratio of the polyester chips to carvacrol, silicone additive, and toughening agent in the core layer premix is ​​1:(0.01-0.05):(0.01-0.04):(0.01-0.05), and the mass ratio of the polyester chips to nano-calcium carbonate, carvacrol, silicone additive, and toughening agent in the skin layer premix is ​​1:(0.02-0.08):(0.01-0.05):(0.01-0.04):(0.01-0.05).

[0013] The present invention is further configured such that the mass ratio of the core layer to the cortex of the hollow core-spun composite filament obtained in step a is 3:(5-7).

[0014] The present invention is further configured such that the hollowness of the porous fibers having the wool-like curled structure is 10-20%.

[0015] The present invention is further configured such that, in step b, the citric acid impregnation treatment of the hollow sheath-core composite primary silk is carried out for 15-30 minutes.

[0016] The present invention is further configured such that, in step a, when the core layer premix and the skin layer premix are melted, the heating temperatures of the zones of the two screw extruders are: 270-275° C. for zone 1, 275-280° C. for zone 2, 280-285° C. for zone 3, 285-290° C. for zone 4, and 280-285° C. for zone 5; and the spinning temperature is 285-290° C.;

[0017] In step b, the side-blown cooling air temperature is 20-25°C and the wind speed is 0.8-1m / s; in the preliminary drawing, the speed of the first drawing roller is 1400-1550m / min and the temperature is 90-95°C, and the speed of the second drawing roller is 2060-3000m / min and the temperature is 105-115°C.

[0018] The present invention is further configured as follows: in step c, the hot blowing temperature is 105-110°C, and the hot blowing time is 5-10min; the cooling and setting wind speed is 1-1.5m / s, and the wind temperature is 15-20°C; the network pressure is 0.3-0.45MPa; the stretching ratio in the re-stretching is 1.5-2, and the stretching speed is 800-1300m / min; and the winding speed is 2500-3500m / min.

[0019] In summary, the present invention has the following beneficial effects:

[0020] By utilizing the reaction between nano-calcium carbonate on the fiber surface and citric acid, the fiber surface has a microporous structure, and combined with the fiber hollow structure and process adjustment, a fiber with high thermal insulation properties is produced to meet higher thermal insulation requirements; and by adding carvacrol, silicone additives and toughening agents (especially the synergistic effect between carvacrol, modified silicone additive VANSLP S5056, and toughening agent ST 2020), fibers with better flexibility and anti-pilling properties are further obtained, which not only meets the thermal insulation requirements but also further meets the requirements for fiber flexibility and anti-pilling properties, making the fiber more competitive in the market. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. 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 making any creative efforts are within the scope of protection of the present invention.

[0022] The method for preparing porous fibers with a wool-like curly structure of the present invention comprises the following steps:

[0023] a. Evenly mix the polyester chips with carvacrol, silicone additive and toughening agent to obtain a core layer premix, wherein the mass ratio of the polyester chips to carvacrol, silicone additive and toughening agent in the core layer premix is ​​1: (0.01-0.05): (0.01-0.04): (0.01-0.05); evenly mix the polyester chips with nano-calcium carbonate, carvacrol, silicone additive and toughening agent to obtain a skin layer premix, wherein the mass ratio of the polyester chips to nano-calcium carbonate, carvacrol, silicone additive and toughening agent in the skin layer premix is ​​1: (0.02-0.08): (0.01-0.05): (0.0 1-0.04): (0.01-0.05); the core layer premix and the sheath layer premix are melted separately through two screw extruders, and the heating temperatures of the zones of the two screw extruders when the core layer premix and the sheath layer premix are melted are: 270-275°C in zone one, 275-280°C in zone two, 280-285°C in zone three, 285-290°C in zone four, and 280-285°C in zone five; the spinning temperature is 285-290°C; the core layer melt and the sheath layer melt are then injected into a composite spinning assembly for spinning to obtain a hollow core-sheath composite spun yarn with a core-to-sheath mass ratio of 3:(5-7).

[0024] Among them, the silicone additive is preferably a modified silicone additive VANSLPS5056 purchased from Guangzhou Fantai New Material Technology Co., Ltd. The toughening agent is an olefin elastomer containing a glycidyl methacrylate functional group, preferably a toughening agent ST 2020 purchased from Xingbeda (Shanghai) Chemical Materials Co., Ltd.

[0025] b. subjecting the hollow core-sheath composite spun yarn obtained in step a to side-blown cooling and preliminary drawing treatment, and then impregnating the fiber with citric acid, washing with water, and drying to obtain a surface porous fiber;

[0026] In step b, the side-blown cooling air temperature is 20-25°C and the wind speed is 0.8-1m / s; the speed of the first drafting roller in the preliminary drafting is 1400-1550m / min and the temperature is 90-95°C, and the speed of the second drafting roller is 2060-3000m / min and the temperature is 105-115°C; the citric acid impregnation treatment time of the hollow sheath-core composite primary silk is 15-30min; and the concentration of the citric acid solution used is 10-15wt%.

[0027] c. The surface porous fibers obtained in step b are subjected to directional hot blowing, cooling and shaping, oiling, networking, re-stretching, and winding treatment to obtain porous fibers with a wool-like curly structure and a hollowness of 10-20%.

[0028] In step c, the hot air temperature is 105-110°C, and the hot air time is 5-10 min; the cooling and setting wind speed is 1-1.5 m / s, and the wind temperature is 15-20°C; the network pressure is 0.3-0.45 MPa; the draft ratio in the re-stretching is 1.5-2, the drafting speed is 800-1300 m / min; and the winding speed is 2500-3500 m / min.

[0029] The preferred embodiment is as follows:

[0030] Example 1

[0031] a. The polyester chips were mixed evenly with carvacrol, modified silicone additive VANSLP S5056 and toughening agent ST 2020 to obtain a core layer premix, wherein the mass ratio of the polyester chips to carvacrol, silicone additive and toughening agent in the core layer premix was 1:0.02:0.01:0.02; the polyester chips were mixed evenly with nano calcium carbonate, carvacrol, modified silicone additive VANSLP S5056 and toughening agent ST 2020 to obtain a skin layer premix, wherein the mass ratio of the polyester chips to nano calcium carbonate, carvacrol, silicone additive and toughening agent in the skin layer premix was 1:0.03:0.02:0.01:0.02; the core layer premix and the skin layer premix were melted separately through two screw extruders. When the core layer premix was melted, the heating temperature of each zone of the screw extruder was: 270°C in zone one, 270°C in zone two, and 270°C in zone three. The heating temperatures of the screw extruder in each zone are: 270°C in zone 1, 278°C in zone 2, 285°C in zone 3, 288°C in zone 4 and 285°C in zone 5 when the skin premix is ​​melted; the spinning temperature is 290°C; the core layer melt and the skin layer melt are then injected into the composite spinning assembly for spinning to obtain a hollow core-skin composite spun yarn with a core-to-skin mass ratio of 3:7.

[0032] b. subjecting the hollow core-sheath composite spun yarn obtained in step a to side-blown cooling and preliminary drawing treatment, and then impregnating the fiber with citric acid, washing with water, and drying to obtain a surface porous fiber;

[0033] In step b, the side-blown cooling air temperature is 20°C and the wind speed is 1 m / s; in the preliminary drawing, the speed of the first drawing roller is 1450 m / min and the temperature is 90°C, and the speed of the second drawing roller is 2900 m / min and the temperature is 105°C; the citric acid impregnation treatment time of the hollow sheath-core composite primary silk is 20 min; and the concentration of the citric acid solution used is 10 wt%.

[0034] c. The surface porous fibers obtained in step b are subjected to directional hot blowing, cooling and shaping, oiling, networking, re-stretching, and winding to obtain porous fibers with a hollowness of 15% and a wool-like curly structure.

[0035] In step c, the hot air temperature is 110°C, and the hot air time is 8 minutes; the cooling and setting wind speed is 1.5 m / s, and the wind temperature is 15°C; the network pressure is 0.4 MPa; the draft ratio in the re-stretching is 1.7, the drafting speed is 920 m / min; and the winding speed is 2800 m / min.

[0036] Comparative Example 1

[0037] The porous fibers having a wool-like curly structure were prepared according to Example 1, but without adding carvacrol.

[0038] Comparative Example 2

[0039] The porous fibers having a wool-like curled structure were prepared according to Example 1, but without adding the modified silicone additive VANSLPS5056.

[0040] Comparative Example 3

[0041] A porous fiber with a wool-like curly structure was prepared according to Example 1, but without adding the toughening agent ST 2020.

[0042] The performance tests were performed on the fibers prepared in Example 1 and Comparative Examples 1 to 3. The results are shown in Table 1.

[0043]

[0044] The results in Table 1 show that the method of the present invention can successfully prepare fibers with high warmth retention, high flexibility, and anti-pilling effects. In addition, carvacrol, the modified silicone additive VANSLP S5056, and the toughening agent ST 2020 have a synergistic effect, which can further improve the flexibility and anti-pilling properties of the fibers.

[0045] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing porous fibers with a wool-like curly structure, characterized in that: The following steps are involved: a. Evenly mixing polyester chips with carvacrol, silicone additives, and toughening agents to obtain a core layer premix; evenly mixing polyester chips with nano-calcium carbonate, carvacrol, silicone additives, and toughening agents to obtain a skin layer premix; melting the core layer premix and the skin layer premix separately through a two-screw extruder, and then injecting the core layer melt and the skin layer melt into a composite spinning assembly for spinning to obtain a hollow skin-core composite spun yarn; The silicone additive is a modified silicone additive VANSLP S5056, and the toughening agent is a toughening agent ST 2020 for olefin elastomers containing glycidyl methacrylate functional groups; The mass ratio of polyester chips to carvacrol, silicone additives, and toughening agents in the core premix is ​​1:0.02:0.01:0.02, and the mass ratio of polyester chips to nano-calcium carbonate, carvacrol, silicone additives, and toughening agents in the skin premix is ​​1:0.03:0.02:0.01:0.02; the mass ratio of the core layer to the skin layer of the hollow skin-core composite primary yarn is 3:7; b. subjecting the hollow core-sheath composite spun yarn obtained in step a to side-blown cooling and preliminary drawing treatment, and then impregnating the fiber with citric acid, washing with water, and drying to obtain a surface porous fiber; c. The surface porous fibers obtained in step b are subjected to directional hot blowing, cooling and shaping, oiling, networking, re-stretching, and winding treatments to obtain porous fibers with a wool-like curly structure.

2. The method for preparing a porous fiber having a wool-like curly structure according to claim 1, characterized in that: The hollowness of the porous fiber with wool-like curled structure is 10-20%.

3. The method for preparing a porous fiber having a wool-like curly structure according to claim 1, characterized in that: In step b, the citric acid immersion treatment of the hollow sheath-core composite primary silk takes place for 15-30 minutes.

4. The method for preparing a porous fiber having a wool-like curly structure according to claim 1, characterized in that: In step a, when the core layer premix and the skin layer premix are melted, the heating temperatures of the zones of the two screw extruders are: 270-275°C in zone 1, 275-280°C in zone 2, 280-285°C in zone 3, 285-290°C in zone 4, and 280-285°C in zone 5; the spinning temperature is 285-290°C; In step b, the side-blown cooling air temperature is 20-25°C and the wind speed is 0.8-1m / s; in the preliminary drawing, the speed of the first drawing roller is 1400-1550m / min and the temperature is 90-95°C, and the speed of the second drawing roller is 2060-3000m / min and the temperature is 105-115°C.

5. The method for preparing a porous fiber with a wool-like curly structure according to claim 1, characterized in that: In step c, the hot air temperature is 105-110°C, and the hot air time is 5-10 min; the cooling and setting wind speed is 1-1.5 m / s, and the wind temperature is 15-20°C; the network pressure is 0.3-0.45 MPa; the draft ratio in the re-stretching is 1.5-2, the drafting speed is 800-1300 m / min; and the winding speed is 2500-3500 m / min.

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