阅读说明：本技术 一种阻燃缝纫线及其生产工艺 (Flame-retardant sewing thread and production process thereof ) 是由 李汉利 李汉顺 庞维新 李建堂 王同伟 王文平 王玉花 王洪林 郭培成 尹吉会 于 2020-02-24 设计创作，主要内容包括：本发明涉及纺织品生产技术领域,尤其涉及一种阻燃缝纫线及其生产工艺。该阻燃缝纫线,以质量百分比计,由以下原料组成：芳纶50％～62％、聚芳噁二唑纤维16％～30％、余量为尼龙短纤维或涤纶短纤维中的一种。该阻燃缝纫线的阻燃效果好、强力高、能够达到高速缝纫不断头的要求、价格合适,且生产简单易操作。(The invention relates to the technical field of textile production, in particular to a flame-retardant sewing thread and a production process thereof. The flame-retardant sewing thread comprises the following raw materials in percentage by mass: 50-62% of aramid fiber, 16-30% of aromatic oxadiazole fiber and the balance of nylon short fiber or polyester short fiber. The flame-retardant sewing thread has good flame-retardant effect, high strength, proper price and simple production and easy operation, and can meet the requirement of high-speed sewing without breaking ends.)

1. The flame-retardant sewing thread is characterized by comprising the following raw materials in percentage by mass: 50-62% of aramid fiber, 16-30% of aromatic oxadiazole fiber and the balance of nylon short fiber or polyester short fiber.

2. The flame retardant sewing thread of claim 1, wherein the nylon staple fiber or the fine denier polyester staple fiber has a single fiber strength of not less than 5.0 cN/dtex.

3. The flame retardant sewing thread of claim 1, wherein the aramid fiber is aramid 1313; the nylon short fibers are nylon 6 short fibers or nylon 66 short fibers.

4. The flame-retardant sewing thread according to claim 1, wherein the fiber length in each raw material is 51mm and the fineness is 1.0 to 3.0 dt.

5. The flame retardant sewing thread of claim 3,

The breaking strength of the polyester staple fibers is 5.4-6.0 cN/dtex, and the elongation at break is 28-32%;

The nylon 66 short fiber has the breaking strength of 5.4-6.0 cN/dtex and the elongation at break of 28-32%;

The nylon 6 short fiber has a breaking strength of 6.0-7.0 cN/dtex and an elongation at break of 35-39%.

6. A process for producing a flame retardant sewing thread according to claim 1, comprising the steps of:

(1) Mixing the components in a certain sequence according to the mass percentage to spin 40s blended yarn;

(2) Twisting the 40s blended yarn prepared in the step (1) to form spun yarn cop;

(3) Steaming and shaping the spun yarn bobbin yarn prepared in the step (2), and then winding, doubling and doubling to form 40s/2 folded yarn;

(4) Steaming and sizing the 40s/2 folded yarn prepared in the step (3), and then doubling and doubling to form a 40s/3 double-twisted folded yarn;

(5) And (4) steaming and sizing the 40s/3 double-twisted plied yarn prepared in the step (4) to prepare the flame-retardant sewing thread.

7. The process for producing a flame retardant sewing thread according to claim 6,

The mixing sequence of the components in the step (1) is as follows: the aramid fiber and the polyoxadiazole fiber are coiled and mixed into raw strips, nylon short fiber or polyester short fiber is separately made into raw strips, and then three-way combination is carried out in the drawing process to mix the three fibers.

8. The process for producing a flame retardant sewing thread according to claim 6,

The twisting coefficient of the 40s blended yarn twisting in the step (2) is 300-350;

In the step (3), the stranding and twisting coefficient is 400-550;

The stranding and twisting coefficient in the step (4) is 430.

9. The process for producing a flame retardant sewing thread according to claim 6,

The yarn steaming and setting parameters of the spun yarn cop in the step (3) are as follows: the temperature is 60-95 ℃, and the time is 15-40 min;

In the step (4), the yarn steaming and setting parameters of 40s/2 folded yarns are as follows: the temperature is 90 ℃, and the time is 40 min;

In the step (5), the yarn steaming and setting parameters of the 40s/3 double-twisted plied yarn are as follows: the temperature is 60-85 ℃, and the time is 20-80 min.

10. The process for producing a flame retardant sewing thread according to claim 6,

The strength of the 40s/2 folded yarn is not lower than 700cN, and the elongation at break is not lower than 17%;

The strength of the 40s/3 double-twisted yarn is not less than 1200cN, and the elongation at break is not less than 20%.

Technical Field

The invention relates to the technical field of textile production, in particular to a flame-retardant sewing thread and a production process thereof.

Background

In the industries of military police clothing, coal, electric power, petrochemical industry and the like, the flame-retardant protective clothing is used as an isolation layer to protect the safety and health of a human body, the flame-retardant sewing thread plays roles of sewing and edge locking in the flame-retardant protective clothing, if the flame-retardant effect of the flame-retardant sewing thread is poor, the flame-retardant protective clothing has the problems of seam separation, damage and the like when encountering fire, and therefore the flame-retardant effect of the flame-retardant sewing thread is not ignored.

The invention patent of application number 201711433229.4 discloses a production process of a flame-retardant sewing thread, which is characterized in that siro compact spinning is adopted to spin aramid 1313 fiber single yarns, the aramid 1313 fibers are subjected to fiber steaming treatment firstly, then yarns are spun, and the yarns are stranded and steamed to prepare the sewing thread, and a humidifying and moisturizing process is adopted in each process to improve the yarn forming performance of the flame-retardant aramid sewing thread. Although the aramid 1313 sewing thread has good flame retardant property, there are some problems: the glass transition temperature is high, dyeing is not easy, the price of aramid 1313 fiber is high, and the sewing thread strength is not as good as that of a high-strength polyester filament sewing thread.

The invention patent of application No. 201510880818.1 discloses a flame-retardant anti-dripping high-strength sewing thread, which takes fine-denier high-strength polyester filament with the fineness less than 300D as a core, and is externally wrapped with flame-retardant anti-dripping fiber, wherein the flame-retardant anti-dripping fiber comprises modacrylic, aramid 1313, aramid 1414 or flame-retardant viscose. The high-strength sewing thread can effectively reduce the cost, has flame retardance and high strength, but has a complex process, needs to adopt flame-retardant fiber strands to coat polyester filaments, needs to well control the proportion of the sheath and the core, and can achieve the smoothness and the strength required by the sewing thread; in addition, the core-spun yarn technology is difficult to coat the filament yarn in the middle of the yarn body at present, and obvious nonuniformity exists on the surface of the yarn body, so that the sewing efficiency is influenced; most importantly, the elongation at break of the yarn is 16-18% and the elongation cannot meet the requirement that the flame retardance of aramid fiber sewing threads is more than 20%.

The invention patent of application number 201810809411.3 discloses a high-strength flame-retardant leather sewing thread, which is formed by using bamboo fiber and cotton fiber blended yarn as core yarn after being soaked and dried by sodium selenite; aramid fiber, ceramic fiber and polyacrylonitrile-based carbon fiber blended outer layer yarn; and then the outer layer yarn is completely wrapped with the core yarn to obtain the high-strength flame-retardant sewing thread which is used for sewing leather. The sewing thread preparation process is too complex and is not easy to implement; the breaking elongation of the sewing thread is only less than 1%, and the sufficient breaking elongation is a necessary condition for ensuring the high-speed sewing without breaking (the general requirement of the flame-retardant aramid fiber sewing thread is higher than 17%). The sewing thread is difficult to be used for sewing requirements of work clothes requiring high-speed sewing.

Utility model patent application No. 201720514614.0 discloses a sewing thread with fire prevention function, obtains fire-retardant sewing thread through fire-retardant coating, but fire-retardant effect is difficult to last.

Therefore, it is necessary to develop a flame-retardant sewing thread which is suitable for flame-retardant protective clothing, has intrinsic flame retardance and high strength, meets the requirement of elongation at break, is proper in price and is easy to prepare.

Disclosure of Invention

The flame-retardant sewing thread has good flame-retardant effect and high strength, can meet the requirement of high-speed sewing without breaking ends, is suitable in price, is easy to prepare by the production process provided by the application, and well solves the problems in the prior art.

On one hand, the technical scheme adopted by the invention for solving the technical problems is as follows:

The flame-retardant sewing thread comprises the following raw materials in percentage by mass: 50-62% of aramid fiber, 16-30% of aromatic oxadiazole fiber and the balance of nylon short fiber or polyester short fiber.

Preferably, the single fiber strength of the nylon short fibers or the polyester short fibers is not lower than 5.0 cN/dtex.

Preferably, the aramid fiber is aramid fiber 1313; the nylon short fibers are nylon 6 short fibers or nylon 66 short fibers.

Preferably, the fiber length in each raw material is 51mm, and the fineness is 1.0-3.0 dt.

Preferably, the breaking strength of the polyester staple fibers is 5.4-6.0 cN/dtex, and the elongation at break is 28-32%;

The nylon 66 short fiber has the breaking strength of 5.4-6.0 cN/dtex and the elongation at break of 28-32%;

The nylon 6 short fiber has a breaking strength of 6.0-7.0 cN/dtex and an elongation at break of 35-39%.

On the other hand, the technical scheme adopted by the invention for solving the technical problems is as follows:

A production process of a flame-retardant sewing thread comprises the following steps:

(1) Mixing the components in a certain sequence according to the mass percentage to spin 40s blended yarn;

(2) Twisting the 40s blended yarn prepared in the step (1) to form spun yarn cop;

(3) Steaming and shaping the spun yarn bobbin yarn prepared in the step (2), and then winding, doubling and doubling to form 40s/2 folded yarn;

(4) Steaming and sizing the 40s/2 folded yarn prepared in the step (3), and then doubling and doubling to form a 40s/3 double-twisted folded yarn;

(5) And (4) steaming and sizing the 40s/3 double-twisted plied yarn prepared in the step (4) to prepare the flame-retardant sewing thread.

Preferably, the mixing sequence of the components in the step (1) is as follows: the aramid fiber and the polyoxadiazole fiber are coiled and mixed into raw strips, nylon short fiber or polyester short fiber is separately made into raw strips, and then three-way combination is carried out in the drawing process to mix the three fibers.

Preferably, the twisting coefficient of the 40s blended yarn in the step (2) is 300-350;

In the step (3), the stranding and twisting coefficient is 400-550;

The stranding and twisting coefficient in the step (4) is 430.

Preferably, the yarn steaming and setting parameters of the spun bobbin yarn in the step (3) are as follows: the temperature is 60-95 ℃, and the time is 15-40 min;

In the step (4), the yarn steaming and setting parameters of 40s/2 folded yarns are as follows: the temperature is 90 ℃, and the time is 40 min;

In the step (5), the yarn steaming and setting parameters of the 40s/3 double-twisted plied yarn are as follows: the temperature is 60-85 ℃, and the time is 20-80 min.

Preferably, the strength of the 40s/2 strand is not lower than 700cN, and the elongation at break is not lower than 17%;

The strength of the 40s/3 double-twisted yarn is not less than 1200cN, and the elongation at break is not less than 20%.

The invention has the beneficial effects that:

1. The aramid fiber, the polyaryl oxadiazole fiber, the nylon short fiber or the polyester short fiber adopted by the flame-retardant sewing thread have good cooperative flame-retardant effect. The requirements of flame retardance of the flame-retardant sewing thread and flame retardance and high temperature resistance without obvious change of appearance at 260 ℃ are met; the strength required by high-speed sewing of the sewing thread is also met; meanwhile, the nylon short fibers or the polyester short fibers are added, so that the production cost is effectively reduced.

2. The production process of the flame-retardant sewing thread is simple to operate, and the parameters in all the steps are set, so that the high yarn breaking elongation is obtained, and the requirement of continuous end breakage in the high-speed sewing process is met.

Drawings

FIG. 1 is a diagram showing the flame-retardant effect of the flame-retardant sewing thread of example 1 of the present invention when the flame-retardant sewing thread is sewn into a flame-retardant fabric, after 12 seconds of exposure to fire;

FIG. 2 is a graph showing the flame-retardant effect of the flame-retardant sewing thread of example 2 of the present invention when exposed to fire for 12 seconds after sewing the flame-retardant fabric;

FIG. 3 is a graph showing the flame-retardant effect of the flame-retardant sewing thread of example 3 of the present invention when the flame-retardant sewing thread sews the flame-retardant fabric and encounters fire for 12 seconds;

FIG. 4 is a graph showing the flame retardant effect of the flame retardant sewing thread of example 4 of the present invention when the flame retardant sewing thread is sewn into a flame retardant fabric, after 12 seconds of exposure to fire;

FIG. 5 is a graph showing the flame retardant effect of the flame retardant sewing thread of example 5 of the present invention when the flame retardant sewing thread is sewn into a flame retardant fabric, after 12 seconds of exposure to fire.

Detailed Description

In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments.