WO2019210650A1

WO2019210650A1 - Preparation technique for low-melting-point polyamide fiber

Info

Publication number: WO2019210650A1
Application number: PCT/CN2018/110733
Authority: WO
Inventors: 顾洪达
Original assignee: 常熟涤纶有限公司
Priority date: 2018-05-03
Filing date: 2018-10-18
Publication date: 2019-11-07
Also published as: CN108560067A

Abstract

Disclosed in the invention is a preparation technique for low-melting-point polyamide fiber, comprising the following steps: (100) taking low-melting-point polyamide slices as raw materials and melting same in a screw to form a spinning solution; (200) adjusting the flow of the spinning solution by means of a metering pump and then extruding same by means of a spinneret to form filaments, so as to obtain fiber bundles; (300) performing air blast cooling on the fiber bundles using a blast heater, and mixing with an antistatic agent and saturant by using a polyamide oil for oiling; (400) performing pre-interlacing on the oiled fiber bundles; 500) performing stretching and setting on the pre-interlaced fiber bundles; (600) performing main interlacing on the fiber bundles obtained after the stretching and setting; (700) performing fully-automatic winding on the fiber bundles obtained after the main interlacing, to obtain a finished fiber product. This solves spinning process problems related to low-melting-point polyamide fiber, such as fiber ends breaking easily, finished fibers being prone to sticking, and backing-off being difficult, and thus improves production stability and efficiency.

Description

Preparation process of low melting point nylon fiber

Technical field

The invention relates to the field of preparation of nylon, in particular to a preparation process of a low melting point nylon fiber.

Background technique

At present, the melt spinning method is the main way to produce low melting point fibers. Compared with ordinary fibers, the main feature is that the melting point is low, and various process parameters in the spinning process need to be adjusted accordingly.

In the prior art, before the feeding, the raw material slice needs to be dried and dried. Because the melting point is low, the softening point is also reduced, the slicing is easy to occur, and the water in the slice is easily vaporized at a high temperature to form a bubble filament, which directly causes Spinning breaks and filaments are not conducive to subsequent spinning. The high moisture content of the slice is likely to cause the ring junction material during the screw feeding stage, and the spinning is directly interrupted. Therefore, it is necessary to optimize the existing preparation process to solve the above problems.

Summary of the invention

The technical problem mainly solved by the invention is that, according to the deficiencies of the prior art, a preparation process of a low melting point nylon fiber is provided, which can solve the problem that the low melting point nylon fiber is easy to break in the spinning process, the finished silk is easy to bond, and is not good. The problem of unwinding improves production stability while reducing production costs and increasing production efficiency.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide a preparation process of a low melting point nylon fiber, comprising the following steps:

(100) Melting: using low-melting-point nylon chips as raw materials, and melting into a spinning dope through a screw;

(200) Metering and spinning: the spinning dope is extruded and spun by a spinneret after adjusting the flow rate by a metering pump to obtain a fiber tow;

(300) Cooling and oiling: the fiber tow is cooled by a hot air device, and then an antistatic agent and a saturating agent are added by a nylon oil to perform oiling treatment;

(400) Pre-network: the fiber tow after oiling is pre-networked through a pre-networker;

(500) Stretching and setting: stretching and shaping the fiber tow after pre-networking, and adopting three pairs of rollers in stretching and setting;

(600) main network: the stretched and shaped fiber tow passes through the main network to carry out the main network;

(700) Winding: The fiber strands passing through the main network are fully wound to obtain a finished product of low-melting nylon fibers.

In a preferred embodiment of the invention, the screw during melting has a total of five zones.

In a preferred embodiment of the invention, the temperatures of the five sections of the screw during melting are: 117°-123°, 147°-153°, 152°-158°, 157°-163°, 167°. -173°.

In a preferred embodiment of the invention, the temperatures of the five zones of the screw during melting are: 120°, 150°, 155°, 160°, 170°.

In a preferred embodiment of the invention, the amount of the antistatic agent added is from 1.5% to 2.5%, and the amount of the saturated agent is from 2.5% to 3.5%.

In a preferred embodiment of the present invention, the spinneret holes of the pre-networker used in the pre-network are inclined.

In a preferred embodiment of the present invention, the pre-networking nozzle hole of the pre-network is inclined at an angle of 60°.

In a preferred embodiment of the invention, the three pairs of rolls have a roughness of 0.8-1.2 μm during the stretching and setting.

In a preferred embodiment of the present invention, the temperatures of the three pairs of rolls during the stretching and setting are 65°-75°, 70°-80°, and 67°-77°, respectively.

In a preferred embodiment of the invention, the temperatures of the three pairs of rolls during the stretching and setting are 70°, 75°, and 72°, respectively.

The invention has the beneficial effects that the low melting point nylon piece is melt-spun, and the antistatic agent and the saturated agent are added to the special oil agent for the nylon by oiling, thereby improving the problem that the finished silk is easy to be bonded and not unwound. Three pairs of rolls are used in the stretching and setting to improve the production stability and solve the problem of easy breakage. The preparation process is simple and easy to operate, and at the same time, energy can be saved, pollution is reduced, production cost is reduced, and production efficiency is improved.

detailed description

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 readily understood by those skilled in the art.

Embodiments of the invention include:

Embodiment 1:

A preparation process of a low melting point nylon fiber, comprising the following steps:

(100) Melting: using low-melting-point nylon chips as raw materials, and melting into a spinning dope through a screw; the screw at the time of melting has five zones, and the temperatures thereof are: 117°, 147°, 152°, 157°, 167 °;

(300) Cooling and oiling: the fiber tow is cooled by a hot air device, and then an antistatic agent and a saturating agent are added by a nylon oil to perform oiling treatment; when the oil is applied, the antistatic agent is added in an amount of 1.5%. The addition amount of the saturant is 3.5%, which improves the problem that the finished silk is easy to bond and is not unwound;

(400) pre-network: the fiber tow after oiling is pre-networked through a pre-networker; the spinning hole of the pre-networker is inclined at an angle of 60°;

(500) Tensile setting: stretching and shaping the pre-networked fiber tow, three pairs of rolls are used for stretching and setting; the three pairs of rolls have a roughness of 0.8-1.2 μm, and the temperature of the three pairs of rolls They are: 65°, 70°, 67°, which improves production stability and solves the problem of easy breakage;

Embodiment 2

(100) Melting: using low-melting-point nylon chips as raw materials, and melting into a spinning dope through a screw; the screw at the time of melting has five zones, and the temperatures are: 123°, 153°, 158°, 163°, 173 °;

(300) Cooling and oiling: the fiber tow is cooled by a hot air device, and then an antistatic agent and a saturating agent are added by a nylon oil to perform oiling treatment; when the oil is applied, the amount of the antistatic agent is 2.5%. The addition amount of the saturant is 2.5%, which improves the problem that the finished silk is easy to bond and does not unwind;

(500) Tensile setting: stretching and shaping the pre-networked fiber tow, three pairs of rolls are used for stretching and setting; the three pairs of rolls have a roughness of 0.8-1.2 μm, and the temperature of the three pairs of rolls They are: 75°, 80°, 77°, which improves production stability and solves the problem of easy breakage;

Embodiment 3

(100) Melting: using low-melting-point nylon chips as raw materials, and melting into a spinning dope through a screw; the screw at the time of melting has five zones, and the temperatures thereof are: 120°, 150°, 155°, 160°;

(300) Cooling and oiling: the fiber tow is cooled by air blowing using a hot air device, and then an antistatic agent and a saturating agent are added by a nylon oil to perform oiling treatment; when the oil is applied, the amount of the antistatic agent is 2%. The amount of the saturant added is 3%, which improves the problem that the finished silk is easy to bond and does not unwind;

(500) Tensile setting: stretching and shaping the pre-networked fiber tow, three pairs of rolls are used for stretching and setting; the three pairs of rolls have a roughness of 0.8-1.2 μm, and the temperature of the three pairs of rolls They are: 70°, 75°, 72°, which improves production stability and solves the problem of easy breakage;

The invention discloses a preparation process of a low-melting-point nylon fiber, which is formed by melt-spinning a low-melting-point nylon piece, and adding an antistatic agent and a saturating agent to the nylon special oil agent by oiling, thereby improving the easy-bonding of the finished silk, It is not easy to unwind. When using three pairs of rollers to improve the production stability and solve the problem of easy breakage, the preparation process is simple and easy to operate. At the same time, it can save energy, reduce pollution, reduce production cost and improve production efficiency. .

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, The same is included in the scope of patent protection of the present invention.

Claims

A preparation process of a low melting point nylon fiber, comprising the steps of:

(100) Melting: using low-melting-point nylon chips as raw materials, and melting into a spinning dope through a screw;

(200) Metering and spinning: the spinning dope is extruded and spun by a spinneret after adjusting the flow rate by a metering pump to obtain a fiber tow;

(300) Cooling and oiling: the fiber tow is cooled by a hot air device, and then an antistatic agent and a saturating agent are added by a nylon oil to perform oiling treatment;

(400) Pre-network: the fiber tow after oiling is pre-networked through a pre-networker;

(500) Stretching and setting: stretching and shaping the fiber tow after pre-networking, and adopting three pairs of rollers in stretching and setting;

(600) main network: the stretched and shaped fiber tow passes through the main network to carry out the main network;

(700) Winding: The fiber strands passing through the main network are fully wound to obtain a finished product of low-melting nylon fibers.
The process for producing a low-melting-point nylon fiber according to claim 1, wherein the screw at the time of melting has a total of five zones.
The process for preparing a low-melting-point nylon fiber according to claim 2, wherein the temperature of the five regions of the screw during melting is 117°-123°, 147°-153°, 152°-158°, respectively. 157°-163°, 167°-173°.
The process for preparing a low-melting-point nylon fiber according to claim 3, wherein the temperatures of the five regions of the screw at the time of melting are 120°, 150°, 155°, 160°, and 170°, respectively.
The process for preparing a low-melting-point nylon fiber according to claim 1, wherein the amount of the antistatic agent added is 1.5% to 2.5%, and the amount of the saturated agent is 2.5% to 3.5%.
The process for preparing a low-melting-point nylon fiber according to claim 1, wherein the pre-network nozzle of the pre-network is inclined.
The process for preparing a low-melting-point nylon fiber according to claim 6, wherein the pre-networking nozzle hole of the pre-network is inclined at an angle of 60°.
The process for preparing a low-melting-point nylon fiber according to claim 1, wherein the three pairs of rolls have a roughness of 0.8 to 1.2 μm during the stretching and setting.
The process for preparing a low-melting-point nylon fiber according to claim 1, wherein the temperature of the three pairs of rolls during the stretching and setting is 65°-75°, 70°-80°, and 67°-77°, respectively. .
The process for preparing a low-melting-point nylon fiber according to claim 9, wherein the temperature of the three pairs of rolls during the stretching and setting is 70°, 75°, and 72°, respectively.