CN113249801A

CN113249801A - Nylon 6 semi-dull in-situ black silk production process

Info

Publication number: CN113249801A
Application number: CN202110399142.XA
Authority: CN
Inventors: 史双进
Original assignee: Changle Liheng Polyamide Technology Co Ltd
Current assignee: Changle Liheng Polyamide Technology Co Ltd
Priority date: 2021-04-14
Filing date: 2021-04-14
Publication date: 2021-08-13

Abstract

The invention discloses a nylon 6 semi-dull in-situ black silk production process in the field of textile chemical fibers, which comprises the steps of continuously feeding in-situ polymerized black semi-dull nylon 6 slices into a screw extruder, and sequentially carrying out melt spinning, cooling, oiling, drafting and winding forming to prepare the nylon 6 semi-dull black silk.

Description

Nylon 6 semi-dull in-situ black silk production process

Technical Field

The invention relates to the technical field of nylon 6 textile chemical fibers, in particular to a nylon 6 semi-dull in-situ black silk thread production process.

Background

The traditional colored nylon-6 fiber product needs to be finished through a plurality of working procedures such as spinning, weaving, printing and dyeing, after finishing and the like. Because the chinlon belongs to hydrophobic fibers, the dyeing has the characteristics of high dyeing speed and high exhaustion rate, the problems of uneven dyeing, color difference and the like are easily caused, and meanwhile, a large amount of dyeing wastewater and washing and drying energy consumption are consumed in the subsequent dyeing process. In recent years, the preparation of colored filaments gradually adopts a dope dyeing technology before spinning to replace the subsequent printing and dyeing. The developed stock solution coloring fiber is mainly prepared by blending natural color chips and color master batches and then carrying out melt spinning, thereby reducing the printing and dyeing energy consumption.

However, the color masterbatch spun colored chinlon 6 adopted at present has the following characteristics: the master batch and the slices are not uniformly blended, and interfacial interaction exists between the polymer and the pigment powder, so that batch color difference and low color fastness are caused; the pigment has larger particle size, and the filter is blocked in the spinning process, so that the pressure of the assembly is increased too fast, and the replacement is frequent; the spinning process is easy to cause the phenomena of broken filaments, floating filaments and the like, and the production quality of the chinlon 6 spinning is seriously restricted.

Based on the technical scheme, the invention designs a chinlon 6 semi-dull in-situ black silk production process to solve the problems.

Disclosure of Invention

The invention aims to provide a nylon 6 semi-dull in-situ black yarn production process, which adopts nylon 6 black chips subjected to in-situ polymerization, directly performs melt spinning on the chips, and optimally designs a winding and drafting process. The prepared nylon-6 black yarn has short flow, low cost and high production continuity; the subsequent dyeing is not needed, so that the generation of a large amount of waste water and energy consumption in the subsequent printing and dyeing are avoided; and the color fastness is higher.

The invention is realized by the following steps: a nylon 6 semi-dull in-situ black yarn production process comprises the following steps:

step 1, continuously feeding the black semi-dull slices colored by the stock solution into a screw extruder; the slicing raw material is in a positive pressure nitrogen environment in the whole process;

step 2, after entering a screw extruder, heating the sliced raw materials to 258 ℃, mixing and melting the raw materials, then metering and pressurizing the preset pressure by the screw extruder, and extruding the melted raw materials;

step 3, continuously and stably pumping the extruded sliced raw material melt into a spinning machine after the extruded sliced raw material melt is metered by a metering pump through a melt pipeline, filtering, mixing and pressurizing the sliced raw material melt by metal sand and a plurality of layers of non-woven fabrics, spraying melt trickle from the spinning machine, cooling slowly by side air blowing, solidifying and forming to form nascent fiber in the air;

step 4, uniformly attaching oiling agents to the formed nascent fibers;

step 5, combining the nascent fibers with the oil agent into tows, mutually winding and interweaving the tows through the airflow of a pre-interlacer, and uniformly blowing the oil agent on the tows by the pre-interlacer;

step 6, winding the tows on two godet rollers, drawing the tows through the godet rollers with two different linear velocities, and then orderly drawing the drawn tows onto a hot roller with a specific temperature to be wound for heat setting;

step 7, feeding the treated tows into a main network device, blowing the tows by the main network device to strengthen the winding degree and the winding quantity of the network again;

step 8, enabling the tows processed by the main network device to pass through the rotating speed of the godet, adjusting the tension of the tows, and loosening the tows to perform normal force traction;

and 9, uniformly and regularly winding the tows into cakes through a winding machine.

Further, the screw extruder had an extrusion pressure of 120 MPA.

Furthermore, a steady-flow smoke suction device is added at the position where the black slice melt-formed nascent fiber passes through, and a single spinning position double-suction single smoke suction device is adopted.

Further, the air pressure of the pre-network device is 0.8-1.2MPA, and the air pressure of the main network device is 4.0-5.0 MPA.

Further, the hot roll temperature is 140 ℃; the linear speeds of the two cold rollers and the hot roller are 3850m/min and 4680m/min respectively, the cold roller with the low speed is pulled at the front end, and the hot roller with the high speed is pulled at the rear end.

Further, the linear speed of the tension adjusting godet is 4600 and 5000 m/min.

The invention has the beneficial effects that:

1. by using the in-situ polymerized black silk polyamide 6 semi-dull slice, direct spinning can be realized, and the problem that the traditional polyamide 6 master batch spinning yarn needs extra equipment such as master batch drying equipment and master batch mixing and metering equipment is solved. Has the advantages of short flow and low cost.

2. The in-situ polymerized black silk chinlon 6 semi-dull slice is adopted, so that the dispersion degree of pigment powder is more uniform than that of master batch spinning, and less impurities are mixed. Greatly reduces the replacement period of the components and effectively improves the production continuity.

3. The black silk product does not need subsequent printing and dyeing, thereby avoiding the generation of a large amount of waste water and energy consumption, saving energy and protecting environment. Meanwhile, the color fastness is higher, no color difference exists among batches, and the color is more uniform.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

FIG. 1 is a schematic flow diagram of the equipment used in the process of the present invention;

FIG. 2 is a schematic view of the process of the present invention.

Detailed Description

Referring to fig. 1 to 2, the present invention provides a technical solution: a nylon 6 semi-dull in-situ black yarn production process comprises the following steps:

step 4, uniformly attaching oiling agents to the formed nascent fibers;

Compared with the master batch method for preparing hardware conditions, each spinning line needs to be provided with special master batch drying and adding equipment, so that the investment cost with the difference of 3-40 ten thousand yuan is saved, and the drying power consumption is saved by 10-30 kwh/t. (ii) a The subsequent dyeing is not needed, so that the generation of a large amount of waste water and energy consumption in the subsequent printing and dyeing are avoided; compared with the physical index of the fiber added by the traditional master batch, the physical index of the fiber is better, and the color fastness is excellent.

Wherein the extrusion pressure of the screw extruder is 120MPA, and the pressure is enough to uniformly extrude the silk threads in a molten state;

a steady-flow monomer suction device is added at the position where the black slice melt-molded nascent fiber passes through, so that the situation that the monomers and low-molecular polymers volatilized from the melt pollute the surface of a spinneret plate and are adhered and condensed on the nascent fiber is avoided, the smoothness of the fiber is improved, and the quality level of spinning is ensured;

the air pressure of the pre-networking device is 1.2MPA, the air pressure of the main networking device is 5.0MPA, the networking degree of the silk threads can be better increased, and the elasticity of the silk threads can be increased;

the temperature of the hot roller is 140 ℃; the linear speeds of the two cold rollers are 3850m/min and 4680m/min respectively, the cold roller with the low speed is pulled at the front end, the hot roller with the high speed is pulled at the rear end, the silk thread can generate proper tension, and meanwhile, the hot roller is used for shaping at the rear section, so that the tension of the silk thread can be more stable, the silk thread can keep the tension of the strength, and the subsequent spinning requirements are facilitated;

the linear speed of the godet is 4650m/min, and the stretched silk threads are properly loosened so as to be conveniently wound into a roll.

In one embodiment of the invention:

the embodiment of the invention provides a chinlon 6 semi-dull in-situ black silk production process, and the technical problem to be solved by the invention is as follows:

1. when the natural color chinlon 6 is colored by adopting a yarn dyeing process, the formed yarn needs to be drawn back through an unwinding mechanism and subjected to multiple processes, so that the fiber loss cost is high, and the physical property of the dyed fiber is reduced; the black silk obtained by the subsequent dyeing and finishing is easy to fade after being washed for many times, and the dye is easy to have poor color fastness under the condition that the stretching tension of the silk yarn is changed after ironing; can not meet the requirements of high-quality colored silk and high-end fabrics.

2. The black chinlon 6 prepared by the master batch blending method has the problems of low blackness and poor color; the addition of the pigment powder easily causes the change of the melt viscosity, thereby influencing the uniformity and stability of the melt; the pigment powder blocks the filter element of the component, the replacement period of the component is frequent, and the production continuity and the yarn quality of the dope-dyed chinlon 6 are seriously restricted.

The realized technical effects are as follows:

In order to solve the above problems, the technical solution in the embodiments of the present invention has the following general idea:

for better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the embodiments.

During installation and debugging, an oxygen-free bin is firstly manufactured, the black chinlon 6 semi-dull slice polymerized in situ is fed into the bin filled with nitrogen, and the bin is connected with a screw extruder. The black slices are melted at high temperature and conveyed into a spinning machine through a metering pump and a pipeline, and the melted black slices are extruded and sprayed out through spinneret orifices on a spinneret plate of the spinning machine to form nascent fibers.

The nascent fiber can be sucked away by the smoke suction device of the monomer, and the smoke of the monomer and the oligomer is rapidly cooled and solidified and formed by the cross air blow. The cooled nascent fiber is subjected to oiling and bundling through an oiling nozzle, and is blown through a pre-interlacer, so that the oiling uniformity of the tows is improved.

And then the filament bundle is pulled through two cold rollers and two hot rollers which are arranged in front and back, the cold roller at the front end is slow, the hot roller at the back is fast, and the silk thread is drawn to increase the fiber orientation degree. The tows are shaped by the hot roller, the internal stress is eliminated, and the stability of the fiber orientation degree is improved.

And then increasing the network degree and the winding degree of the filament bundles again through the main network device, increasing the cohesive force of the filament bundles, adjusting the tension by using a filament guide disc to avoid the too tight tension of the filament bundles, and then winding the recovered normal filament bundles into a coil, thereby completing the installation and debugging of the equipment.

The stock bin, the screw extruder and the device are common devices in the textile industry, and are not described herein.

When the process spinning operation is carried out:

directly adding the stock solution colored black semi-dull slices into a slice bin, and continuously conveying the black slices to a screw extruder; the black slices need protection from atmospheric oxidation with nitrogen.

The black slices enter a screw extruder, are fully mixed and melted through a feeding section, a compression section and a metering section of the extruder under the condition that the temperature is generally about 258 ℃, are metered and generate a preset pressure, and the pressure is set to be 120MPA to be extruded from the top of the screw.

The extruded melt is conveyed into a metering pump through a pipeline, the melt metering pump accurately meters and continuously and stably conveys the melt to a spinning machine according to the set production variety, preset spinning extrusion pressure 160MPA is generated, melt fine flow is sprayed out from a circular spinneret orifice on a spinneret plate of the spinning machine after metal sand and multi-layer non-woven fabrics are filtered, mixed and pressurized, and then the melt fine flow is slowly cooled, solidified and formed through a side-blowing cooling system, so as to form nascent fiber in the air. When the black slices are melt-molded into nascent fibers, a small amount of monomers and oligomers can be generated at a spinning port due to cracking, negative pressure is generated under the action of a smoke suction device for stabilizing the negative pressure of circulating water, the monomers and oligomers remained on the surface of the filaments are timely pumped away, and the quality of products is effectively guaranteed.

The smoke suction means of stationary flow has just increased the negative pressure oil smoke suction means of vortex net, and the absorption dynamics of air current is less, and wind-force is comparatively gentle, and wind-force uses the marcing of not disturbing the silk thread as the standard, can give the silk thread cooling, also can take away the monomer smog absorption of silk thread simultaneously, belongs to textile industry's common device.

The as-spun fiber after molding is oiled through the oiling system, the oiling system is even and stable to the yarn, the oiling can enhance the cohesive force of the fiber, the fiber bundling is facilitated, the friction force of the filament bundle can be reduced in the subsequent stretching process, the static electricity is reduced, and the generation of abnormal conditions such as broken filament and broken filament is reduced

The oiled fiber enters a interlacer, tows are mutually wound and interwoven in a nozzle of the interlacer under the pressure action of low air pressure 1.2MPA, an oiling agent is more uniformly attached to the tows by the interlacer, the spinnability is obviously improved, the yarn breakage rate is obviously reduced, the proportion of wool yarns is reduced in the post-processing unwinding process, and the quality stability of the nylon yarns is improved;

the filament bundle processed by the pre-network device is wound for 3 circles by a cold roller, and then is sequentially drawn to a hot roller to be wound for 5 circles for heat setting, the temperature of the hot roller is 140 ℃, meanwhile, the filament bundle is drawn by two godet rollers with different linear velocities, the speed of one godet roller is 3850m/min, and the speed of the other godet roller is 4680 m/min; the drawn strand silk is heat-set on a hot roller, internal stress generated in the drawing process of the fabric fiber is eliminated by using heat, macromolecules are loosened to a certain degree, the shape of the fiber is fixed and formed, and therefore the internal structure of the silk is changed, and the silk meets the stable high-quality requirement.

The treated yarn strips are sent into a main network device, the cohesion of the yarn strips is further strengthened under the action of certain high air pressure (5.0MPA), the yarn strips reach the network meeting the requirements, the precondition is provided for the subsequent weaving processing, the winding tension is more stable, and the forming is facilitated.

The production conditions of this example are as follows: melting vapor phase temperature of in-situ polymerized nylon-6 black semi-dull slices: 260 ℃, melt temperature: 259 ℃, melt pressure: 120kg/cm2, spinning speed: 4600m/min, rotation speed of a metering pump: 10.73rpm, oil pump rotation speed: 45.9rpm, side blow wind speed: 0.60m/s, draw ratio DR: 1.22.

The quality of the FDY product produced and molded by the method is detected as follows: the linear density is 44.2dtex, the breaking strength is 4.9g/dtex, the elongation at break is 39.7%, the boiling water shrinkage is 10.5%, the oil content is 1.8%, the yarn evenness is 1.05%, and the network degree is 7/m. Comparing physical indexes of products prepared by different preparation methods of the same variety:

although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.

Claims

1. A chinlon 6 semi-dull in-situ black silk production process is characterized by comprising the following steps:

step 2, after entering a screw extruder, heating the sliced raw materials to 258 ℃ for mixing and melting, then metering and pressurizing the preset pressure by the screw extruder, and extruding the molten melt;

step 3, continuously and stably pumping the extruded sliced raw material melt into a spinning machine after the extruded sliced raw material melt is metered by a metering pump through a melt pipeline, filtering, mixing and pressurizing the sliced raw material melt by metal sand and a plurality of layers of non-woven fabrics, spraying melt trickle from the spinning machine, cooling slowly by side air blowing, solidifying and forming, and forming nascent fiber in the air;

step 4, uniformly attaching oiling agents to the formed nascent fibers;

2. The production process of the chinlon semi-dull in-situ black silk thread according to claim 1, characterized by comprising the following steps: the extrusion pressure of the screw extruder is 110-130 MPA.

3. The production process of the chinlon semi-dull in-situ black silk thread according to claim 1, characterized by comprising the following steps: and a steady-flow smoke suction device is added at the position where the nascent fiber is formed by melting the black slice, and a single spinning position double-suction single smoke suction device is adopted.

4. The production process of the chinlon semi-dull in-situ black silk thread according to claim 1, characterized by comprising the following steps: the air pressure of the pre-network device is 0.8-1.2MPA, and the air pressure of the main network device is 4.0-5.0 MPA.

5. The production process of the chinlon semi-dull in-situ black silk thread according to claim 1, characterized by comprising the following steps: the temperature of the hot roller is 140 ℃; the linear speeds of the two cold rollers and the hot roller are 3850m/min and 4680m/min respectively, the cold roller with the low speed is pulled at the front end, and the hot roller with the high speed is pulled at the rear end.

6. The production process of the chinlon semi-dull in-situ black silk thread according to claim 5, characterized by comprising the following steps of: the linear speed of the tension adjusting godet is 4600-5000 m/min.