Preparation method of porous fiber with wool-like curled structure

Abstract

The invention discloses a preparation method of a porous fiber with a wool-like curled structure, and belongs to the technical field of synthetic fibers. The method comprises the following steps: a, uniformly mixing polyester chips with carvacrol, a silicone auxiliary agent and a toughening agent to obtain a core layer premix, and uniformly mixing the polyester chips with nano calcium carbonate, carvacrol, the silicone auxiliary agent and the toughening agent to obtain a skin layer premix; respectively melting the core layer premix and the skin layer premix, and then injecting into a composite spinning assembly for spinning to obtain a hollow skin-core composite nascent filament; b, the hollow skin-core composite nascent filaments are subjected to cross air blowing cooling and preliminary drafting treatment, then citric acid dipping treatment is conducted, drying is conducted after water washing, and surface porous fibers are obtained; and c, carrying out directional hot blowing, cooling shaping, oiling, interlacing, re-drafting and winding treatment on the surface porous fiber to obtain the porous fiber with the wool-like curled structure. The obtained fiber has high warmth retention property, high flexibility and anti-pilling effect, and can meet higher use requirements.

Description

Technical Field

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

[0002] With the development of polyester fiber industry, the differentiation rate of polyester fiber is constantly improving, and textile fabrics have undergone significant changes in terms of feel, drape, comfort and appearance. With the improvement of people's living standards, people have higher and higher requirements for textile fabrics, and simulation fabrics have also emerged. Imitation wool fabric is currently the most commonly used simulation fabric. However, the warmth retention of imitation wool curly fibers on the market is not ideal, and there are still shortcomings such as poor softness and easy pilling, which makes it 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 curled 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 solution:

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

[0006] a. Evenly mix the polyester slices with carvacrol, silicone additives and toughening agent to obtain a core premix; evenly mix the polyester slices with nano calcium carbonate, carvacrol, silicone additives and toughening agent to obtain a skin premix; melt the core premix and the skin premix separately through a two-screw extruder, and then inject the core layer melt and the skin layer melt into a composite spinning assembly for spinning to obtain a hollow skin-core composite primary yarn;

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

[0008] c. Subjecting the surface porous fibers obtained in step b to directional hot blowing, cooling and shaping, oiling, networking, re-stretching, and winding processes to obtain porous fibers with a wool-like curling 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 that in step a, the mass ratio of polyester chips to carvacrol, silicone additives and toughening agents in the core layer premix is ​​1: (0.01-0.05): (0.01-0.04): (0.01-0.05), and the mass ratio of polyester chips to nano-calcium carbonate, carvacrol, silicone additives and toughening agents 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 skin layer of the hollow skin-core composite primary yarn obtained in step a is 3:(5-7).

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

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

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

[0017] In step b, the side-blowing cooling air temperature is 20-25°C and the wind speed is 0.8-1m / s; in the preliminary stretching, the speed of the first stretching roller is 1400-1550m / min and the temperature is 90-95°C, and the speed of the second stretching 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 shaping 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 obtained to meet higher thermal insulation requirements; and by adding carvacrol, silicone additives and toughening agents (especially utilizing the synergistic effect of carvacrol, modified silicone additive VANSLP S5056, and toughening agent ST 2020), fibers with better flexibility and anti-pilling properties are further obtained. While meeting the thermal insulation requirements, the requirements for fiber flexibility and anti-pilling properties are further met, making the fiber more competitive in the market. DETAILED DESCRIPTION

[0021] 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.

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

[0023] a. Evenly mix the polyester slices with carvacrol, silicone additive and toughening agent to obtain a core layer premix, wherein the mass ratio of the polyester slices to the 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 slices with nano-calcium carbonate, carvacrol, silicone additive and toughening agent to obtain a skin layer premix, wherein the mass ratio of the polyester slices to the 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 skin layer premix are melted separately through two screw extruders, and the heating temperatures of the two screw extruders are: 270-275°C for zone one, 275-280°C for zone two, 280-285°C for zone three, 285-290°C for zone four, and 280-285°C for zone five when the core layer premix and the skin layer premix are melted respectively; the spinning temperature is 285-290°C; then the core layer melt and the skin layer melt are injected into the composite spinning assembly for spinning to obtain a hollow core-skin composite primary yarn with a core layer to skin layer 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 Xingbeida (Shanghai) Chemical Materials Co., Ltd.

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

[0026] In step b, the side-blowing 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, the speed of the second drafting roller is 2060-3000m / min and the temperature is 105-115°C; the immersion time of the hollow sheath-core composite primary silk in citric acid is 15-30min; the concentration of the citric acid solution used is 10-15wt%.

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

[0028] In step c, the hot blowing temperature is 105-110° C., and the hot blowing time is 5-10 min; the cooling and shaping 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 stretching ratio in the re-stretching is 1.5-2, and the stretching speed is 800-1300 m / min; and the winding speed is 2500-3500 m / min.

[0029] The preferred embodiments are as follows:

[0030] Example 1

[0031] a. Evenly mix the polyester chips 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 is ​​1: 0.02: 0.01: 0.02; evenly mix the polyester chips 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 is ​​1: 0.03: 0.02: 0.01: 0.02; melt the core layer premix and the skin layer premix separately through two screw extruders, and when the core layer premix is ​​melted, the heating temperatures of each zone of the screw extruder are: 270°C in the first zone, 270°C in the second zone, and 2 The heating temperatures of the screw extruder in each zone are as follows: 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; then the core layer melt and the skin layer melt are injected into the composite spinning assembly for spinning to obtain a hollow skin-core composite primary yarn with a core layer to skin layer mass ratio of 3:7.

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

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

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

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

[0036] Comparative Example 1

[0037] The porous fiber having the wool-like curled structure was prepared according to Example 1, but without adding carvacrol.

[0038] Comparative Example 2

[0039] The porous fiber having the wool-like curling structure was prepared according to Example 1, but without adding the modified silicone auxiliary agent VANSLPS5056.

[0040] Comparative Example 3

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

[0042] The performance of the fibers prepared in Example 1 and Comparative Examples 1 to 3 was tested, and the results are shown in Table 1.

[0043]

[0044] It can be seen from the results in Table 1 that the method of the present invention can successfully prepare fibers with high warmth retention, high flexibility and anti-pilling effects, and there is a synergistic effect between carvacrol, modified silicone additive VANSLP S5056 and toughening agent ST 2020, which can further improve the flexibility and anti-pilling performance of the fiber.

[0045] 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 method for preparing porous fibers with a wool-like curly structure, characterized in that: The following steps are involved: a. Evenly mix the polyester slices with carvacrol, silicone additives and toughening agent to obtain a core premix; evenly mix the polyester slices with nano calcium carbonate, carvacrol, silicone additives and toughening agent to obtain a skin premix; melt the core premix and the skin premix separately through a two-screw extruder, and then inject the core layer melt and the skin layer melt into a composite spinning assembly for spinning to obtain a hollow skin-core composite primary yarn; b. subjecting the hollow core-sheath composite spun yarn obtained in step a to side-blowing cooling and preliminary drawing treatment, and then subjecting the fiber to citric acid impregnation treatment, washing with water and drying, to obtain a surface porous fiber; c. Subjecting the surface porous fibers obtained in step b to directional hot blowing, cooling and shaping, oiling, networking, re-stretching, and winding processes to obtain porous fibers with a wool-like curling structure.

2. The method for preparing a porous fiber having a wool-like curled structure according to claim 1, characterized in that: The silicone additive is a modified silicone additive VANSLP S5056.

3. The method for preparing a porous fiber with a wool-like curled structure according to claim 1, characterized in that: The toughening agent is an olefin elastomer containing a glycidyl methacrylate functional group.

4. The method for preparing a porous fiber with a wool-like curled structure according to claim 3, characterized in that: The toughening agent is toughening agent ST 2020.

5. The method for preparing porous fibers with wool-like curled structures according to claim 1, characterized in that: In step a, the mass ratio of polyester chips to carvacrol, silicone additives and toughening agents in the core layer premix is ​​1: (0.01-0.05): (0.01-0.04): (0.01-0.05), and the mass ratio of polyester chips to nano-calcium carbonate, carvacrol, silicone additives and toughening agents in the skin layer premix is ​​1: (0.02-0.08): (0.01-0.05): (0.01-0.04): (0.01-0.05).

6. The method for preparing porous fibers with wool-like curled structures according to claim 1, characterized in that: The mass ratio of the core layer to the skin layer of the hollow core-skin composite primary silk obtained in step a is 3:(5-7).

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

8. The method for preparing porous fibers with wool-like curled structures according to claim 1, characterized in that: In step b, the immersion time of the hollow core-sheath composite primary silk in citric acid is 15-30 minutes.

9. The method for preparing porous fibers with wool-like curled structures according to claim 1, characterized in that: In step a, when the core layer premix and the skin layer premix are melted respectively, 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; the spinning temperature is 285-290°C; In step b, the side-blowing cooling air temperature is 20-25°C and the wind speed is 0.8-1m / s; in the preliminary stretching, the speed of the first stretching roller is 1400-1550m / min and the temperature is 90-95°C, and the speed of the second stretching roller is 2060-3000m / min and the temperature is 105-115°C.

10. The method for preparing porous fibers with wool-like curled structures according to claim 1, characterized in that: In step c, the hot blowing temperature is 105-110° C., and the hot blowing time is 5-10 min; the cooling and shaping 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 stretching ratio in the re-stretching is 1.5-2, and the stretching speed is 800-1300 m / min; and the winding speed is 2500-3500 m / min.

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