WO2022247054A1

WO2022247054A1 - Method for producing cool-feeling elastic fiber

Info

Publication number: WO2022247054A1
Application number: PCT/CN2021/117087
Authority: WO
Inventors: 杨卫星; 钟琪芬; 刘少波; 胡建松; 孙燕琳; 肖顺立; 钱跃兴; 吴亚萍
Original assignee: 桐昆集团股份有限公司
Priority date: 2021-05-28
Filing date: 2021-09-08
Publication date: 2022-12-01
Also published as: CN113445142A

Abstract

A method for producing a cool-feeling elastic fiber, in which Dupont PTT chips are used, and a cool-feeling masterbatch is added during a spinning process; a rotary drum is used for tackifying; and a means of drying at a low temperature for a long time, a low spinning temperature, a continuous Roots-style blower for flexible conveying, a dust separation apparatus, a high-precision masterbatch injection machine, parallel spinnerets for compound spinning, and a side-blowing cooling flow regulator are also used.

Description

A kind of production method of cool feeling elastic fiber

technical field

The invention relates to the field of chemical fiber production and processing, in particular to a production method of cool-feeling elastic fiber.

Background technique

After years of rapid development of my country's chemical fiber industry, the output of chemical fiber has continued to rank first in the world since 1998, and China is the largest producer of chemical fiber in the world. In 2017, my country's chemical fiber output was nearly 50 million tons, accounting for more than 70% of the total global fiber output. However, the "quantity" of the industry has grown significantly. There are many bulk and conventional products, and the research and development level of high-tech products such as modified fibers, high-fidelity fibers, special functional fibers, ultra-fine denier fibers, and functional fibers is low. In recent years, my country's chemical fiber industry has stepped up innovation efforts, focused on the overall technological progress of the industry, eliminated backward production capacity by market means, and further increased the differentiation rate of chemical fibers, but there is still a certain gap with developed countries. Therefore, further expanding the production scale of high-tech fibers in my country and improving the differentiation rate of chemical fiber products have become the top priority of the current chemical fiber industry development.

PTT is an excellent polymer polymer product that integrates the excellent performance indicators of various chemical synthetic fibers. It is different from high-performance fibers such as carbon fiber, aramid fiber, and spandex. It does not have a special performance in a certain index of its products. It is a new polymer material characterized by its excellent comprehensive performance indicators and the appropriate improved value of some indicators. With the increasing maturity of spinning, printing and dyeing and downstream applications, the demand for PTT fibers and their products is increasing, and there is a huge room for development. Among them, TS biological cable elastic yarn is a PTT/PET two-component high elastic fiber , which optimizes the combination of bio-based raw material PTT (polytrimethylene terephthalate) and conventional polyester raw material PET (polyethylene terephthalate) in a specific ratio to form a two-component side-by-side composite fiber. How to prepare a differentiated cable-elastic yarn has become a demand.

technical solution

The object of the present invention is to provide a kind of production method of cool-feeling cable-elastic fiber, the prepared cable-elastic fiber of gained has cool feeling on the basis of having elasticity, and make the new product produced have elasticity and fineness more uniform, product quality It is more stable and has good durability and good dyeability. Common disperse dyes can be used for atmospheric pressure boiling dyeing without carrier. The dyed fiber has bright color, excellent color fastness and chlorine resistance.

For solving the problems of the technologies described above, the purpose of the present invention is achieved in that:

The production method of a kind of cool-feeling cable-elastic fiber involved in the present invention has the following production steps. The selected PET raw material is transported, pre-crystallized, dried, melted and extruded to form a spinning melt and enter the spinning through the box metering pump. Components; the selected PTT raw materials are conveyed, solid-phase viscosified, dried, melt-extruded, and filtered to form a spinning melt through a box metering pump for spinning components; PET spinning melt and PTT spinning melt are spinning Melt collection is realized in the filament assembly, and the collected melt is spun and then subjected to side blowing, oiling, pre-netting, drafting and setting, main network, winding forming, inspection, grading packaging, and finished products;

Add the dried cooling masterbatch in the spinning process, the drying temperature of the cooling masterbatch is 120±5°C;

The spinning component is a dual-channel spinning component. During the spinning process, the spinning temperature of PTT should be reduced as much as possible. It is required that the spinning temperature of PTT should not exceed 275°C. At the same time, the residence time of the melt should be reduced, the time for changing components should be shortened as much as possible, and the metering pump should be reduced. The start and stop time of the machine can reduce the thermal degradation of the melt;

Control the range of draft ratio between 2.5-3.0, if it is too small, the yarn will become stiff and the rebound will be poor, if it is too large, it will easily produce fuzz; the temperature of the first hot roller is 60-80°C, and the temperature of the second hot roller is 135-150°C ; And on the basis of the first hot roller and the second hot roller, a pair of splitter discs is added, the purpose is to achieve relaxation and presetting, better release the thermal stress of the fiber, and further control the winding tension.

On the basis of the above scheme and as the preferred scheme of the above scheme: the polyester chips used in the PTT are slices with a viscosity of about 0.96dl/g from DuPont Company, and the cooling masterbatch is from Klein Company to ensure the stability of the raw materials.

On the basis of the above scheme and as the preferred scheme of the above scheme: there should be no dead angle in the melt pipeline, and the smoothness of the pipe wall should be as high as possible, controlled within 0.5, to avoid degradation caused by friction between the melt and the pipe wall; melt filter The filter element should not be too dense, choose a filter element of 80-120μ to reduce the degradation of the melt due to shear heat; the metal sand of the PTT side component should not be too fine, generally between 20-30 mesh, and the component pressure should be controlled at 12-16MPa.

On the basis of the above-mentioned scheme and as the preferred scheme of the above-mentioned scheme: the polyester chip conveying method transforms the original pulse-type air-compressed air conveying into a continuous Roots blower flexible conveying, which reduces the dust generated by the friction between the slice and the conveying pipeline, and avoids The internal quality of the slices is damaged, and at the same time, the vibrating screen is used to separate the dust and large particles of impurities when conveying to the drying tower. An additional self-developed dust separation device is also added before entering the screw; a nitrogen protection device is added to the screw inlet, which can reduce the oxidation of the slices and further Prevent melt degradation.

On the basis of the above scheme and as the preferred scheme of the above scheme: the temperature of the PTT screw and the pipeline of the tank is about 10 degrees lower than the PET setting.

On the basis of the above scheme and as the preferred scheme of the above scheme: the temperature of side blowing is controlled at 23±1°C, the humidity is kept at 75%-85%, and the wind speed is between 0.5-0.7m/s; the selection of pre-network air volume is reasonable, Between 0.3-0.6Kg; the winding tension is controlled at around 0.16g/D.

On the basis of the above-mentioned scheme and as the preferred scheme of the above-mentioned scheme: a composite spinneret is used, and an ultrasonic cleaning machine with an energy-concentrating head is used to clean the spinneret.

On the basis of the above scheme and as the preferred scheme of the above scheme: adjust the winding angle during winding forming, which is larger than ordinary polyester FDY, about 10°, and the winding contact pressure cannot exceed 170N.

On the basis of the above-mentioned solution and as a preferred solution of the above-mentioned solution: during the production process of the cool-feeling cable elastic yarn, the workshop environment is 30±5°C.

Beneficial effect

The beneficial effects of the present invention are: the production method of a kind of cool-feeling cable-elastic fiber involved in the present invention is developed on the Beijing Zhongli FDY spinning, drawing and winding integrated machine, adopts Dupont PTT slices, and Cooling masterbatch is added during the process, drum viscosity is used, low temperature and long-term drying method, low spinning temperature, continuous Roots blower flexible conveying, dust separation device, high-precision masterbatch injection machine, composite spinning The side-by-side spinnerets and side-blown cooling rectifiers are used for silk, so that the new products produced have more uniform elasticity and fineness, and more stable product quality. They also have good durability and good dyeability, and can be processed with ordinary disperse dyes. Atmospheric pressure boiling dyeing without carrier, the dyed fiber has bright color, excellent color fastness and chlorine resistance. At the same time, the product is soft to the touch, anti-fouling and fluffy, moisture-absorbing and quick-drying, smooth and smooth after being processed into a fabric, anti-wrinkle and non-ironing, stable in size, and moderate in elasticity. Making it into sportswear, especially in summer, is cool and light, moisture-wicking, comfortable and healthy, and will be a major trend in future fabrics.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be further described below in conjunction with specific examples.

The production method of a kind of cool-feeling cable-elastic fiber involved in the present invention has the following production steps. The selected PET raw material is transported, pre-crystallized, dried, melted and extruded to form a spinning melt and enter the spinning through the box metering pump. Components; the selected PTT raw materials are conveyed, solid-phase viscosified, dried, melt-extruded, and filtered to form a spinning melt through a box metering pump for spinning components; PET spinning melt and PTT spinning melt are spinning The melt is collected in the filament assembly, and the collected melt is spun and then subjected to side blowing, oiling, pre-netting, drafting and setting, main network, winding forming, inspection, grading and packaging, and finished products. The drying temperature of PET chips is 165°C±5°C. The drying temperature of PTT drum after thickening is 105℃±5℃.

The raw materials used in this production method are as follows:

1. Source of slices: DuPont PTT slices.

2. Source of masterbatch: cool masterbatch from Clariant Masterbatch (Shanghai) Co., Ltd.

3. Oil agent source: Japan Takemoto F-1782 special imported oil agent.

Production equipment used in this production method:

1. Drying equipment: Zhengzhou COSCO Drying Engineering Co., Ltd.

2. Master batch injection machine: Jiangsu Jiangben Automatic Control Equipment Co., Ltd.

3. Melt spinning equipment: Dalian Longsheng Machinery Co., Ltd.

4. Spinning measurement equipment: German Marr (Mar) company.

5. Spinneret equipment: Suzhou Xinlun Spinneret Component Factory.

6. Drafting and winding equipment: Beijing Zhongli Machinery Engineering Technology Co., Ltd.

The present invention adopts a one-step method to produce cable-elastic silk fiber under the premise of adding a certain proportion of cool-feeling masterbatch, melt-spinning by slicing method, stretching process and winding process, and produces matting PBT high-elastic fiber on conventional FDY textile equipment. Rationality, minimization of production costs, stability of product quality, etc., and how to realize industrialization.

Add the dried cooling masterbatch in the spinning process, the drying temperature of the cooling masterbatch is 120±5°C; the masterbatch is dried 8 hours before the use of the masterbatch, and the drying time of the masterbatch is controlled at 8-10 hours. Add 5.5% cooling masterbatch to both sides of PET and PTT during spinning.

In this example, different melt-spinning processes are used for the raw materials of the two components, and the temperature balance is realized in the mixing box, and the dual-channel melt convergence point is realized in the spinning assembly, so that the two components The raw materials of one part are mixed in one proportion and stretched into fibrils, and one-step stretching technology is adopted to realize the development and production of bi-component fibers with elasticity and cool feeling.

In the present invention, the polyester chips used in PTT are chips with a viscosity of about 0.96dl/g from DuPont. PTT slices are viscosified by solid phase, that is, intermittently viscosified by drums, vacuuming, nitrogen protection, etc., so that the viscosity is changed from the original 0 .95dl/g increased to 1.25dl/g, since the water content of PTT slices is already very low after thickening, no need to dry again, so only 105±5℃ dry air protection is enough. And the cooling masterbatch adopts the products of Klein Company to ensure the stability of raw materials.

In order to maximize the elastic performance of the fiber and improve the spinning condition, the spinning assembly is a dual-channel spinning assembly. The pipes of the two components are installed in a spinning box at the same time, and the melt convergence point is set reasonably so that the two components Fully achieve the optimization and balance effect; reduce the spinning temperature of PTT as much as possible during the spinning process, and require that the spinning temperature of PTT should not exceed 275°C, and at the same time reduce the residence time of the melt, shorten the time for changing components as much as possible, and reduce the start-up of the metering pump Downtime to reduce thermal degradation of the melt. Spinning assembly pressure: PTT is 12MPa; PET is 9MPa. Proportion of metal sand: PTT is 35-45 mesh, dosage is 30 grams; PET is 80-100 mesh, dosage is 30 grams.

And in the melting production process, the melt pipeline should not have dead angles, and the pipe wall finish should be as high as possible, controlled within 0.5, to avoid degradation caused by friction between the melt and the pipe wall.

And when filtering PET and PTT melts, the filter element of the melt filter should not be too dense. We choose a filter element of 80-120μ to reduce the degradation of the melt due to shear heat.

During spinning, PET is specifically at a vapor phase of 280°C±2°C, a zone temperature of 275°C±2°C, and a PTT vapor phase of 275°C±2°C, and a zone temperature of 270°C±2°C.

In order to reduce broken ends, the conveying method of polyester chips transforms the original pulse air conveying into continuous Roots blower flexible conveying, which reduces the dust generated by the friction between the slices and the conveying pipe, avoids the internal quality of the slices from being damaged, and at the same time goes to the drying The vibrating screen is used to separate dust and large particles of impurities during tower transportation, and an additional self-developed dust separation device is added before entering the screw; a nitrogen protection device is added to the screw inlet to reduce the oxidation of slices and further prevent melt degradation. The temperature of the PTT screw and the tank pipeline is about 10 degrees lower than the PET setting.

The side blowing temperature is controlled at 23±1°C, the humidity is maintained at 75%-85%, and the wind speed is between 0.5-0.7m/s; the pre-network air volume is reasonably selected between 0.3-0.6Kg; the winding tension is controlled at 0.16 g/D or so.

In the production process, since the composite spinneret is made, it is easy to produce poor filaments. Therefore, we have strengthened the cleaning strength and used an ultrasonic cleaning machine with a concentrated energy head to clean the spinneret to ensure the cleanliness of the spinneret. At the same time, the component process is optimized, and metal sand is used to meet the good filtering effect and the homogenization of the melt.

Due to the high elasticity of the high-elastic fiber produced by the one-step FDY production process, it is easy to have poor molding of the silk cake during winding and forming, mainly manifested in the uneven end surface of the silk cake and the convex side of the side, which affects the appearance inspection. At the same time, it also leads to difficulty in unwinding in the rear. In order to avoid the occurrence of poorly formed yarn cakes, we adjust the winding angle to be larger than ordinary polyester FDY, about 10°, and the winding contact pressure cannot exceed 170N.

Due to the limitation of the hardware conditions of the chip spinning enterprise, we cannot achieve constant temperature and humidity during product production, and the fluctuation of temperature brings hidden dangers to the internal quality of the product. Therefore, it is necessary to achieve the purpose of stabilizing the ambient temperature through artificial regulation. It is found that the quality of the product is the most stable when the ambient temperature is 30±5°C. Therefore, a special person is set up in the workshop to monitor the winding temperature, so as to make timely adjustments and reduce temperature fluctuations due to climate and seasonal changes.

Main process parameters:

1. Specification: 83dtex/32F series

2. Drying temperature:

PET: Drying temperature 165°C±5°C

PTT: Drying temperature after drum thickening: 105°C±5°C

Cool masterbatch: drying temperature 120℃±5℃

3. Oil agent: Japan Takemoto F-1782, concentration 15%±0.5%

4. Spinning: component pressure: PTT 12MPa; PET 9MPa

Metal sand ratio: PTT 35-45 mesh 30 grams, PET 80-100 mesh 30 grams

Spinning temperature: for PET, the vapor phase is 280°C±2°C, the zone temperature is 275°C±2°C, and the PTT vapor phase is 275°C±2°C, and the zone temperature is 270°C±2°C;

6. Side blowing air temperature is 22°C, rheumatism is 80%, and wind speed is 0.55m/s.

7. Winding: speed: 3700 m/min, winding tension: 0.16g/D, pre-net pressure: 0.8kg±0.1kg, main network pressure: 3.5kg±0.1kg

Technical indicators:

1. Linear density (dtex/F): 83dtex/32F

2. Linear density deviation rate (%): ±1.5

3. Linear density coefficient of variation CV value (%): ≤1.5

4. Breaking strength (cN/dtex): ≥2.90

5. CV value of coefficient of variation of breaking strength (%): ≤6.00

6. Elongation at break (%): 33±5.0

7. Coefficient of variation of elongation at break CV value (%): ≤12.00

8. Boiling water shrinkage (%): 9.0±2.5

9. Dyeing uniformity (gray card)/level: ≥4

10. Curl elastic shrinkage rate (%): 45±4.0

11. Oil content (%): 1.0±0.2

12. Network degree (piece/m): 20±5

13. Tube weight (kg): fixed weight or fixed length

During the research and development process of the cool-feeling cable-elastic fiber, due to the problems of process design and equipment defects, there were many chipping dust, melt degradation, many spinning ends, poor molding, fast boosting of components, and difficult unwinding, etc. For a series of problems, the R&D personnel solved the above problems one by one by changing the slice conveying method, adding a vibrating screen device, a dust separation device, adjusting the component configuration, installing a godet, adjusting the drying, spinning, and winding processes. The elastic fiber has finally been put into production smoothly, and after trial feedback from many customers, debugging and improvement by craftsmen, the final product has met the quality requirements expected by customers. At present, this new product has achieved mass production and has been sold to many customers. Customer feedback is good.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims

A method for producing cool-feeling elastic fibers, characterized in that the production steps are as follows, the selected PET raw materials are transported, pre-crystallized, dried, melted and extruded to form a spinning melt and enter the spinning assembly through a box metering pump ;The selected PTT raw materials are conveyed, solid-phase viscosified, dried, melt-extruded, and filtered to form a spinning melt through a box metering pump for spinning components; PET spinning melt and PTT spinning melt are spinning Melt collection is realized in the component, and the collected melt is spun and then subjected to side blowing, oiling, pre-network, drafting and setting, main network, winding forming, inspection, grading packaging, and finished products;

Add the dried cooling masterbatch in the spinning process, the drying temperature of the cooling masterbatch is 120±5°C; the masterbatch is dried 8 hours before the use of the masterbatch, and the drying time of the masterbatch is controlled at 8-10 hours.

The spinning component is a dual-channel spinning component. During the spinning process, the spinning temperature of PTT should be reduced as much as possible. It is required that the spinning temperature of PTT should not exceed 275°C. At the same time, the residence time of the melt should be reduced, the time for changing components should be shortened as much as possible, and the metering pump should be reduced. The start and stop time of the machine can reduce the thermal degradation of the melt;

Control the range of draft ratio between 2.5-3.0, if it is too small, the yarn will become stiff and the rebound will be poor, if it is too large, it will easily produce fuzz; the temperature of the first hot roller is 60-80°C, and the temperature of the second hot roller is 135-150°C ; And on the basis of the first hot roller and the second hot roller, a pair of splitter discs is added, the purpose is to achieve relaxation and presetting, better release the thermal stress of the fiber, and further control the winding tension.
The method for producing cool-feeling cable-elastic fiber according to claim 1, characterized in that the polyester chips used in the PTT are slices with a viscosity of about 0.96dl/g from DuPont, and the cool-feeling masterbatch is from Klein Company. Ensure the stability of raw materials.
The method for producing cool-feeling cable-elastic fibers according to claim 1, characterized in that there should be no dead angle in the melt pipeline, and the smoothness of the pipe wall should be as high as possible, controlled within 0.5, so as to avoid friction between the melt and the pipe wall to cause heat generation. Degradation; the filter element of the melt filter should not be too dense, choose a filter element of 80-120μ to reduce the degradation of the melt due to shear heat; the metal sand of the PTT side component should not be too fine, generally between 20-30 mesh, the component pressure Controlled at 12-16MPa.
The production method of cool-feeling cable-elastic fiber according to claim 1, characterized in that, the conveying mode of polyester chips transforms the original pulse-type air-compressed air conveying into continuous Roots blower flexible conveying, which reduces the distance between the slices and the conveying pipeline. The dust generated by friction avoids damage to the internal quality of the slices. At the same time, the vibrating screen is used to separate the dust and large particles of impurities when conveying to the drying tower. An additional self-developed dust separation device is also added before entering the screw; a nitrogen protection device is added to the screw inlet. It can reduce chip oxidation and further prevent melt degradation.
The method for producing cool-feeling cable-elastic fibers according to claim 1, characterized in that the temperature of the PTT screw and the tank pipeline is about 10 degrees lower than the PET setting.
The method for producing cool-feeling elastic fibers according to claim 1, characterized in that the temperature of side blowing is controlled at 23±1°C, the humidity is kept at 75%-85%, and the wind speed is between 0.5-0.7m/s; The selection of pre-network air volume is reasonable, between 0.3-0.6Kg; the winding tension is controlled at about 0.16g/D.
The method for producing cool-feeling cable-elastic fibers according to claim 1, characterized in that, a composite spinneret is used, and the spinneret is cleaned by an ultrasonic cleaning machine with an energy-concentrating head.
The production method of cool-feeling elastic fiber according to claim 1, characterized in that the winding angle is adjusted during winding forming, which is about 10° larger than ordinary polyester FDY, and the winding contact pressure cannot exceed 170N.
The method for producing cool-feeling elastic fiber according to any one of claims 1-8, characterized in that, during the production process of the cool-feeling elastic fiber, the workshop environment is 30±5°C.