Preparation method of long-acting antistatic bacteriostatic PBT low stretch yarn

Abstract

The invention discloses a preparation method of long-acting antistatic and bacteriostatic PBT (polybutylene terephthalate) low stretch yarn. The preparation method of the long-acting antistatic and bacteriostatic PBT low stretch yarn comprises the following steps: step 1, blending PBT slices and antistatic and bacteriostatic master batches, and performing melt extrusion granulation through a twin-screw; secondly, the PBT particles obtained in the first step are dried for 8-12 h and then subjected to melt spinning, and then POY filaments are obtained through air cooling, bundling, oiling and rolling; thirdly, the POY filaments are sequentially subjected to preheating, twisting, heating setting and cooling oiling and then are wound to obtain the PBT low stretch yarn finished product, the preheating temperature ranges from 110 DEG C to 130 DEG C, the twisting number ranges from 0.5 to 2, and the environment temperature during heating setting ranges from 190 DEG C to 210 DEG C. Through the mode, the PBT low stretch yarn can keep low shrinkage rate and has good antistatic and antibacterial capabilities, and the functional requirements of textiles are met.

Description

Technical Field

[0001] The invention relates to the field of polyester fiber materials, and in particular to a method for preparing long-lasting antistatic and antibacterial PBT low-elastic yarn. Background Art

[0002] BT fiber is a kind of polyester fiber. Compared with the commonly used PET fiber, it has a faster crystallization speed, higher elongation and better elastic recovery rate, and has good durability and dimensional stability. The fabric made of PBT fiber has a soft feel, good moisture absorption, abrasion resistance and fiber curling, excellent tensile elasticity and compression elasticity, and its elastic recovery rate is significantly enhanced compared with polyester. Therefore, it is particularly suitable for making swimsuits, tights, training suits, gymnastics suits, bodybuilding suits, tennis suits, dance tights, stretch jeans, ski pants, stockings, medical bandages and other high-elastic textiles. However, since PBT fiber is too elastic, it is easy to deform when making patterns on fabrics, and the surrounding contours are not clear enough. Therefore, in practice, low-elastic filaments are generally made by compounding fibers of other materials on the basis of PBT fibers to replace single PBT high-elastic yarns. The process of composite production of low-elastic yarns is more complicated and the material cost is higher than that of single-material PBT high-elastic yarns. In order to solve this contradiction, our company has developed a PBT low-elastic yarn production process CN202410660322.2 based on ordinary fiber-grade PBT raw materials. However, in the actual promotion process, customers have further requirements for the performance of related textiles, hoping that the products can meet specific functions such as anti-static and inhibition of bacterial growth. Summary of the invention

[0003] The main technical problem solved by the present invention is to provide a method for preparing functional PBT low-elastic yarn, which can have good antistatic and antibacterial capabilities.

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a method for preparing a long-lasting antistatic and antibacterial PBT low-elastic yarn, characterized in that the method for preparing the long-lasting antistatic and antibacterial PBT low-elastic yarn comprises:

[0005] In the first step, the PBT chips are blended with the antistatic and antibacterial masterbatch and then granulated by twin-screw melt extrusion;

[0006] In the second step, the PBT particles obtained in the first step are dried for 8 to 12 hours and then melt-spun, and then air-cooled, bundled, oiled and rolled to obtain POY filaments;

[0007] In the third step, the POY filament is preheated, twisted, heated and set, cooled and oiled, and then rolled up to obtain the PBT low-elastic yarn product, wherein the preheating temperature is 110-130°C, the twist number is 0.5-2, and the ambient temperature during heating and setting is 190-210°C.

[0008] In a preferred embodiment of the present invention, the mass ratio of the PBT slices to the antistatic and antibacterial masterbatch in the first step is 100:15-20.

[0009] In a preferred embodiment of the present invention, the intrinsic viscosity of the PBT chips is 1.1-1.2 dL / g.

[0010] In a preferred embodiment of the present invention, the antistatic and antibacterial masterbatch is prepared by blending 10-15 parts by weight of nanosilver, 10-15 parts by weight of nonionic antistatic agent, 3-5 parts by weight of silane coupling agent and 100 parts by weight of PBT chips and then granulating by twin-screw melt extrusion.

[0011] In a preferred embodiment of the present invention, the intrinsic viscosity of the PBT chips is 0.8-0.9 dL / g.

[0012] In a preferred embodiment of the present invention, the specification of the POY filament is 80dtex / 14f or 80dtex / 28f.

[0013] The beneficial effect of the present invention is that, based on the existing PBT low-elastic yarn process of the company, the present invention mixes the antistatic and antibacterial masterbatch made of PBT as the base material with PBT slices, and then fully mixes the functional components in the masterbatch with the base material through secondary melting, and then performs spinning processing, so as to obtain PBT low-elastic yarn which not only has a low shrinkage rate but also has good antistatic and antibacterial properties, thereby meeting the customer's requirements for raw materials of functional textiles. DETAILED DESCRIPTION

[0014] The preferred embodiments of the present invention are described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0015] The embodiments of the present invention include:

[0016] Example 1

[0017] A method for preparing a long-lasting antistatic and antibacterial PBT low-elastic yarn, the method comprising:

[0018] The first step is to blend the PBT slices with the antistatic antibacterial masterbatch in a weight ratio of 100:20 and then melt-extrude and granulate them through a twin-screw extruder, wherein the antistatic antibacterial masterbatch is prepared by blending the PBT slices with nanosilver, sorbitol and silane coupling agent in a weight ratio of 100:10:15:3 and then melt-extruding and granulating them, the intrinsic viscosity of the PBT slices used in the antibacterial masterbatch is 0.90 dL / g, and the intrinsic viscosity of the PBT slices blended with the antistatic antibacterial masterbatch is 1.13 dL / g;

[0019] In the second step, the PBT particles obtained in the first step are dried at 120° C. for 8 to 12 hours to ensure that the moisture content in the dried slices is less than 30 PPM, and then melted for a second time, spun at 260° C., and then air-cooled, bundled, oiled and rolled to obtain POY filaments;

[0020] In the third step, the POY filament is unwound at a speed of 700 to 900 m / min, and is preheated, twisted, heated to set, cooled and oiled before being rolled up to obtain the antistatic and antibacterial PBT low-elastic yarn product.

[0021] Example 2

[0022] A method for preparing a long-lasting antistatic and antibacterial PBT low-elastic yarn, the method comprising:

[0023] The first step is to blend the PBT slices with the antistatic antibacterial masterbatch in a weight ratio of 100:15 and then melt-extrude and granulate them through a twin-screw extruder, wherein the antistatic antibacterial masterbatch is prepared by blending the PBT slices with nanosilver, polyether ester and silane coupling agent in a weight ratio of 100:15:15:5 and then melt-extruding and granulating them, the intrinsic viscosity of the PBT slices used in the antibacterial masterbatch is 0.90 dL / g, and the intrinsic viscosity of the PBT slices blended with the antistatic antibacterial masterbatch is 1.13 dL / g;

[0024] In the second step, the PBT particles obtained in the first step are dried at 120° C. for 8 to 12 hours to ensure that the moisture content in the dried slices is less than 30 PPM, and then melted for a second time, spun at 260° C., and then air-cooled, bundled, oiled and rolled to obtain POY filaments;

[0025] In the third step, the POY filament is unwound at a speed of 700 to 900 m / min, and is preheated, twisted, heated to set, cooled and oiled before being rolled up to obtain the antistatic and antibacterial PBT low-elastic yarn product.

[0026] Example 3

[0027] A method for preparing a long-lasting antistatic and antibacterial PBT low-elastic yarn, the method comprising:

[0028] The first step is to blend PBT slices with antistatic antibacterial masterbatch in a weight ratio of 100:20 and then melt-extrude and granulate them through a twin-screw extruder, wherein the antistatic antibacterial masterbatch is prepared by blending PBT slices with nanosilver, ethanolamide and silane coupling agent in a weight ratio of 100:15:10:4 and then melt-extruding and granulating them, the intrinsic viscosity of the PBT slices used in the antibacterial masterbatch is 0.90 dL / g, and the intrinsic viscosity of the PBT slices blended with the antistatic antibacterial masterbatch is 1.13 dL / g;

[0029] In the second step, the PBT particles obtained in the first step are dried at 120° C. for 8 to 12 hours to ensure that the moisture content in the dried slices is less than 30 PPM, and then melted for a second time, spun at 260° C., and then air-cooled, bundled, oiled and rolled to obtain POY filaments;

[0030] In the third step, the POY filament is unwound at a speed of 700 to 900 m / min, and is preheated, twisted, heated to set, cooled and oiled before being rolled up to obtain the antistatic and antibacterial PBT low-elastic yarn product.

[0031] The test results of finished product performance in the above embodiments 1 to 3 are as follows:

[0032]

[0033]

[0034] There are two key points in the present invention. The first is to use a secondary melting method to fully disperse the functional molecules in the antistatic antibacterial masterbatch in the PBT phase, so that the final product performance of the raw materials is uniform and stable during melt spinning. The second key point is that the intrinsic viscosity of the substrate of the antistatic antibacterial masterbatch is relatively small, while the intrinsic viscosity of the PBT slices as the main raw material is relatively large. The reason for this design is that the size of the intrinsic viscosity basically reflects the molecular chain length of the PBT molecule in a certain sense. In this way, after the PBT slices with a smaller molecular chain length are used as the substrate of the antistatic antibacterial masterbatch and the PBT substrate with a larger molecular chain length are mixed and melted, there are more gaps in the arrangement and entanglement at the microscopic level, which can better accommodate the added nanosilver particles and antistatic agent molecules without affecting the overall elastic change trend. From the above test results, it can also be seen that the telescopic performance of the above three POY filaments after the same process treatment is significantly lower than 50%, that is, the telescopic performance of the conventional PBT elastic wire, and the surface resistivity can meet the antistatic requirements in actual use. Since the antistatic agent used in the present invention also contains nanosilver particles, the finished product in this embodiment also meets the long-term antibacterial requirements for textiles.

[0035] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing long-lasting antistatic and antibacterial PBT low-elastic yarn, characterized in that: The preparation method of the long-lasting antistatic and antibacterial PBT low-elastic yarn comprises: In the first step, the PBT chips are blended with the antistatic and antibacterial masterbatch and then granulated by twin-screw melt extrusion; In the second step, the PBT particles obtained in the first step are dried for 8 to 12 hours and then melt-spun, and then air-cooled, bundled, oiled and rolled to obtain POY filaments; In the third step, the POY filament is preheated, twisted, heated and set, cooled and oiled, and then rolled up to obtain the PBT low-elastic yarn product, wherein the preheating temperature is 110-130°C, the twist number is 0.5-2, and the ambient temperature during heating and setting is 190-210°C.

2. The method for preparing the long-lasting antistatic and antibacterial PBT low-elastic yarn according to claim 1, characterized in that: In the first step, the mass ratio of the PBT slices to the antistatic and antibacterial masterbatch is 100:15-20.

3. The method for preparing the long-lasting antistatic and antibacterial PBT low-elastic yarn according to claim 1, characterized in that: The intrinsic viscosity of the PBT chips is 1.1-1.2 dL / g.

4. The method for preparing the long-lasting antistatic and antibacterial PBT low-elastic yarn according to claim 1, characterized in that: The antistatic and antibacterial masterbatch is prepared by blending 10-15 parts by mass of nanosilver, 10-15 parts by mass of nonionic antistatic agent, 3-5 parts by mass of silane coupling agent and 100 parts by mass of PBT slices and then granulating by twin-screw melt extrusion.

5. The method for preparing the long-lasting antistatic and antibacterial PBT low-elastic yarn according to claim 1, characterized in that: The intrinsic viscosity of the PBT chips is 0.8-0.9 dL / g.

6. The method for preparing the long-lasting antistatic and antibacterial PBT low-elastic yarn according to claim 1, characterized in that: The specification of the POY filament is 80dtex / 14f or 80dtex / 28f.

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