Environment-friendly flame-retardant polyester yarn

Abstract

This utility model discloses an environmentally friendly flame-retardant polyester yarn, comprising a core layer, an outer sheath layer, and a wrapping layer. The core layer includes a first fiber sliver and a second fiber sliver; multiple first fiber slivers and multiple second fiber slivers are blended to form the core layer. The first fiber sliver is composed of lyocell fiber, and the second fiber sliver is composed of recycled polyester staple fiber. The outer sheath layer is formed by bidirectionally covering the surface of the core layer with S-twist covered yarn and Z-twist covered yarn, both of which are composed of flame-retardant polyester fiber. The wrapping layer covers the surface of the outer sheath layer and is made of flame-retardant viscose staple fiber, which is wrapped onto the outer surface of the outer sheath layer by a friction spinning machine. This utility model's environmentally friendly flame-retardant polyester yarn has good flame-retardant properties and also possesses environmentally friendly, breathable, and antibacterial properties.

Description

Technical Field

[0001] This utility model specifically relates to an environmentally friendly flame-retardant polyester yarn, belonging to the technical field of polyester yarn. Background Technology

[0002] Polyester yarn refers to yarn spun from polyester. Polyester is a type of polymer fiber produced by spinning. Polyester yarn has high strength, can withstand greater tensile force, and is not easily broken. Among them, flame-retardant polyester yarn is based on polyester yarn, which is modified to have certain flame-retardant properties. For example, Chinese Patent Publication No. CN115506062B discloses an environmentally friendly flame-retardant polyester yarn, which includes the following fiber weight percentages: 60-70% polyester outer core yarn and 30-40% cotton inner core yarn. A method for preparing an environmentally friendly flame-retardant polyester yarn includes the following steps: S1: pre-treating the polyester outer core yarn and the cotton inner core yarn respectively; S2: sequentially passing the pre-treated polyester outer core yarn and cotton inner core yarn through carding, blending and twisting to obtain the environmentally friendly flame-retardant polyester yarn. The environmentally friendly flame-retardant polyester yarn has good softness and flame retardancy; however, the fabric woven from the yarn has generally poor resilience, breathability and antibacterial properties, and the fabric cannot meet the comfort requirements. Utility Model Content

[0003] To address the aforementioned issues, this invention proposes an environmentally friendly flame-retardant polyester yarn. This polyester yarn exhibits excellent flame-retardant properties and also possesses environmentally friendly, breathable, and antibacterial characteristics.

[0004] This utility model discloses an environmentally friendly flame-retardant polyester yarn, comprising:

[0005] The core layer comprises a first fiber sliver and a second fiber sliver; the core layer is formed by a blend of multiple first fiber slivers and multiple second fiber slivers, wherein the first fiber sliver is composed of lyocell fiber and the second fiber sliver is composed of recycled polyester staple fiber; the ratio of the number of first fiber slivers to the number of second fiber slivers is 1:3; the core layer uses a blended yarn of the first fiber sliver and the second fiber sliver, wherein the lyocell fiber in the blended yarn has natural antibacterial properties and the resilience of recycled polyester staple fiber, thereby enhancing the skin-friendliness and environmental friendliness of the core layer;

[0006] The outer sheath is composed of S-twist covered yarn and Z-twist covered yarn bidirectionally covering the surface of the core layer. Both the S-twist covered yarn and the Z-twist covered yarn are made of flame-retardant polyester fiber. The outer sheath uses flame-retardant polyester fiber filaments to bidirectionally cover the core layer, which can ensure the structural strength and flame-retardant performance of the yarn.

[0007] The outer sheathing layer is wrapped around the surface of the outer sheathing layer. The outer sheathing layer is made of flame-retardant viscose staple fiber, which is wrapped onto the outer surface of the outer sheathing layer by a friction spinning machine. The outer sheathing layer is made of flame-retardant viscose staple fiber wrapped around the outer sheathing layer. On the basis of the structural strength of the outer sheathing layer, the hand feel of the yarn is increased, and the flame retardant properties, dyeability and breathability of the outer surface of the polyester yarn are also increased.

[0008] Furthermore, the weight difference per unit length between the first fiber sliver and the second fiber sliver is less than 4%.

[0009] Furthermore, the flame-retardant polyester fiber includes polyester fiber filaments, and the surfaces of the polyester fiber filaments and recycled polyester staple fibers are impregnated and dried to cure a flame-retardant layer, which is made of ZR series halogen-free flame retardant; the flame-retardant layer modifies the polyester fiber filaments, giving them flame-retardant properties.

[0010] Furthermore, the flame-retardant polyester fiber is made by melt-blending and spinning polyester chips with a flame-retardant polymer; the polyester fiber obtained by melt-spinning polyester chips and a flame-retardant polymer has flame-retardant properties.

[0011] Furthermore, the polyester chips are antistatic polyester chips, and the polyester yarn obtained by processing the polyester chips has antistatic properties.

[0012] Furthermore, a bamboo fiber core yarn is embedded in the center of the core layer, which forms a heat-insulating carbonization barrier at the center of the polyester yarn, reducing molten droplets.

[0013] Compared with existing technologies, the environmentally friendly flame-retardant polyester yarn of this utility model adopts a wrapping layer and an outer sheath to protect the core layer. The wrapping layer and the outer sheath have excellent flame-retardant properties, and the entire polyester yarn has good flame-retardant properties. The wrapping layer uses flame-retardant viscose staple fiber, which has good breathability, high hand comfort, and can increase the flame-retardant properties, dyeability, and breathability of the outer surface of the polyester yarn. The core layer has natural antibacterial properties, which makes the polyester yarn wrinkle-resistant, breathable, antibacterial, and skin-friendly. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the radial cross-sectional structure of the environmentally friendly flame-retardant polyester yarn in Embodiment 1 of this utility model.

[0015] Figure 2 This is a three-dimensional microscope illustration of the environmentally friendly flame-retardant polyester yarn of Embodiment 1 of this utility model.

[0016] Figure 3 This is a schematic diagram of the radial cross-sectional structure of the environmentally friendly flame-retardant polyester yarn in Embodiment 2 of this utility model.

[0017] Reference numerals: 1. Core layer; 2. First fiber sliver; 3. Second fiber sliver; 4. Outer layer; 5. Wrapping layer; 6. Bamboo fiber core yarn; 7. S-twist covered yarn; 8. Z-twist covered yarn. Detailed Implementation

[0018] Example 1:

[0019] like Figure 1 and Figure 2 The environmentally friendly flame-retardant polyester yarn shown includes:

[0020] The core layer 1 comprises a first fiber sliver 2 and a second fiber sliver 3. Multiple first fiber slivers 2 and multiple second fiber slivers 3 are blended to form the core layer 1. The first fiber sliver 2 is composed of lyocell fiber, and the second fiber sliver 3 is composed of recycled polyester staple fiber. The ratio of the number of first fiber slivers 2 to the number of second fiber slivers 3 is 1:3. The core layer 1 uses a blended yarn of first fiber slivers 2 and second fiber slivers 3. The lyocell fiber in the blended yarn has natural antibacterial properties, enhancing the skin-friendliness and environmental friendliness of the core layer 1. During processing, the first fiber slivers 2 and second fiber slivers 3 undergo an opening and cleaning process, reducing the beater speed to 700-800 rpm to minimize damage to flame-retardant fibers. The carding roller needle cloth density is increased by 15% to improve fiber straightness. Then, drawing and roving are performed, using a roller spacing ≥10mm, reducing the roving twist coefficient to 80% of ordinary yarn, and increasing the basis weight by 5-8% to compensate for fiber strength loss.

[0021] The outer sheath 4 is formed by bidirectionally covering the surface of the core layer 4 with S-twist covered yarn 7 and Z-twist covered yarn 8. Both S-twist covered yarn 7 and Z-twist covered yarn 8 are made of flame-retardant polyester fiber. The outer sheath 4 uses flame-retardant polyester fiber filaments to bidirectionally cover the core layer 1, which can ensure the structural strength and flame-retardant performance of the yarn.

[0022] The outer layer 5 is wrapped around the surface of the outer layer 4. The outer layer 5 is made of flame-retardant viscose staple fiber, which is wrapped onto the outer surface of the outer layer 4 by a friction spinning machine. The outer layer 5 is wrapped with flame-retardant viscose staple fiber on the outer layer 4. In addition to the tear resistance of the outer layer 4, the yarn hand feel is increased, and the flame retardant performance, dyeability and breathability of the outer surface of the polyester yarn are also increased. The polyester yarn adopts two layers of flame retardancy. Before 400℃, the flame retardant is thermally decomposed by the flame-retardant viscose. The cellulose fiber degrades at 200-400℃. After 400℃, the flame retardant is further enhanced by the flame-retardant polyester fiber.

[0023] The weight difference per unit length between the first fiber sliver 2 and the second fiber sliver 3 is less than 4%.

[0024] The flame-retardant polyester fiber includes polyester fiber filaments. The polyester fiber filaments and recycled polyester staple fibers are impregnated and dried to form a flame-retardant layer. The flame-retardant layer is made of ZR series halogen-free flame retardant. The polyester fiber filaments are modified by the flame-retardant layer to give them flame-retardant properties.

[0025] The processing steps for flame-retardant polyester fiber are as follows:

[0026] First, flame retardant impregnation is performed using a 10% solution of ZR series halogen-free flame retardant (Texnology ZR10). The polyester fiber filaments are immersed at room temperature for 30 minutes, with the liquid-pickup rate controlled at 80%. Then, drying and curing are carried out using a gradient temperature rise process: pre-drying at 80℃ for 10 minutes, followed by baking at 140℃ for 30 minutes to avoid fiber embrittlement caused by high temperature. The flame retardant fixation rate is >95%. Finally, softening and antistatic treatment is performed by impregnating with a silicone softener (concentration 3%) and winding with conductive rubber rollers to reduce the accumulation of static electricity in the yarn and improve the hand feel.

[0027] Flame-retardant polyester fiber was used to prepare the outer sheath 4. The final flame-retardant polyester yarn was subjected to performance tests: the damaged length in the vertical burning test was ≤100mm (better than GB / T 38303-2019 standard), there were no molten droplets during burning, and the flame retardant retention rate was ≥95% after 50 washes; the breaking strength test of the flame-retardant polyester yarn was carried out according to GB / T 14337 standard, and the maximum load value was recorded by axial tension until breakage, and the relative strength (unit is cN / dtex) was calculated. The breaking strength can reach 4.1 cN / dtex.

[0028] The flame-retardant polyester fiber is produced by melt-blending and spinning polyester chips and flame-retardant polymer; the polyester chips and flame-retardant polymer are melt-spun to obtain polyester fibers with flame-retardant properties; the polyester chips and flame-retardant polymer are melt-blended at a mass ratio of 100:115, the flame-retardant polymer is a flame-retardant polymer containing an organic salt structure (such as bis(3-aminophenyl)(3,5-bis(trifluoromethyl)phenyl)phosphine oxide), antioxidant (3%) and lubricant (1%) are added simultaneously, and melt-spun at 260-290℃ through a screw extruder to obtain flame-retardant polyester fiber; the polyester chips are antistatic polyester chips, and the polyester yarn obtained by processing the polyester chips has antistatic properties.

[0029] Example 2:

[0030] like Figure 3The environmentally friendly flame-retardant polyester yarn shown has a bamboo fiber core yarn 6 embedded in the center of the core layer 1. The bamboo fiber core yarn 6 forms a heat-insulating carbonization barrier in the center of the polyester yarn, reducing melting and dripping. The bamboo fiber core yarn 6 is first pretreated by humidifying the bamboo fiber to control the moisture regain rate of 0.4-0.6%, and then loading a bio-based flame retardant (such as sodium alginate derivative) by impregnation for 30 minutes, followed by spin drying until no water drips.

[0031] The above embodiments are merely preferred embodiments of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model are included within the scope of the present utility model.

Claims

1. An environmentally friendly flame-retardant polyester yarn, characterized in that: include: Core layer, the core layer comprising a first fiber sliver and a second fiber sliver; The core layer is formed by blending multiple first fiber slivers and multiple second fiber slivers. The first fiber sliver is made of lyocell fiber, and the second fiber sliver is made of recycled polyester staple fiber. The ratio of the number of first fiber slivers to the number of second fiber slivers is 1:

3. The outer sheath is formed by bidirectionally covering the surface of the core layer with S-twist covered yarn and Z-twist covered yarn, both of which are made of flame-retardant polyester fibers. A wrapping layer, which covers the surface of the outer wrapping layer, is made of flame-retardant viscose staple fiber, which is wrapped onto the outer surface of the outer wrapping layer by a friction spinning machine.

2. The environment-friendly flame-retardant polyester yarn according to claim 1, characterized in that: The weight difference per unit length between the first fiber sliver and the second fiber sliver is less than 4%.

3. The environment-friendly flame-retardant polyester yarn according to claim 1, characterized in that: The flame-retardant polyester fiber includes polyester filaments, and the surfaces of the polyester filaments and recycled polyester staple fibers are impregnated and dried to cure a flame-retardant layer, which is made of ZR series halogen-free flame retardants.

4. The environment-friendly flame-retardant polyester yarn according to claim 1, characterized in that: The flame-retardant polyester fiber is made by melt-blending and spinning polyester chips with a flame-retardant polymer.

5. The environment-friendly flame-retardant polyester yarn according to claim 4, characterized in that: The polyester chips are antistatic polyester chips.

6. The environment-friendly flame-retardant polyester yarn according to claim 1, characterized in that: The core layer is inlaid with bamboo fiber core yarn.

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