CN112251827A - Polylactic acid tow with H-shaped sheath-core structure and preparation method thereof - Google Patents
Polylactic acid tow with H-shaped sheath-core structure and preparation method thereof Download PDFInfo
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- CN112251827A CN112251827A CN202010946178.0A CN202010946178A CN112251827A CN 112251827 A CN112251827 A CN 112251827A CN 202010946178 A CN202010946178 A CN 202010946178A CN 112251827 A CN112251827 A CN 112251827A
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- polylactic acid
- core
- layer
- shaped
- sheath
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/098—Melt spinning methods with simultaneous stretching
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/34—Core-skin structure; Spinnerette packs therefor
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D7/00—Collecting the newly-spun products
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
Abstract
The invention provides an H-shaped sheath-core polylactic acid structure tow, wherein a single fiber in the tow comprises a sheath layer and a core layer, the resin materials of the sheath layer and the core layer are polylactic acid, and the section of the single fiber is H-shaped. Also provides a preparation method of the filament bundle. The polylactic acid tow with the H-shaped sheath-core structure has a composite H-shaped sheath-core structure, does not need to add a nucleating agent, improves the crystallinity of a core layer under the condition of ensuring the bonding property, and solves the problems of tow shrinkage, collapse and deformation of a formed filter rod and the like.
Description
Technical Field
The invention belongs to the technical field of cigarette filter tip materials and preparation thereof, and particularly relates to an H-shaped sheath-core structure polylactic acid tow and a preparation method of the H-shaped sheath-core structure polylactic acid tow.
Background
According to the literature report, a certain research result is obtained in the aspect of tows of polylactic acid cigarettes at home and abroad, such as Liaojing, polylactic acid fiber [ J ] chemical fiber and textile technology, 2003,4:34, Xuanwu, the processing and structural performance analysis of the polylactic acid fiber [ J ] Jiangsu textile, 2005, (11):37, but the crystallization rate of the polylactic acid material is very slow. The polylactic acid fiber prepared by the conventional spinning method has low crystallization degree, and the problems of tow shrinkage, collapse and deformation of a formed filter stick and the like are easily caused when the placing temperature is high. In order to solve the end-shortening problem, a commonly used method at present is to add a nucleating agent into a polylactic acid raw material to improve the crystallization rate and the crystallinity of the polylactic acid. However, the surface structure of the polylactic acid with high crystallization is densified, and the common adhesive, namely glyceryl triacetate, cannot penetrate into the polylactic acid tows, so that the tows cannot be swelled and bonded. Therefore, how to balance thermal stability and adhesiveness is the biggest problem facing polylactic acid at present.
Disclosure of Invention
Based on the above, the first object of the invention is to provide a polylactic acid tow with an H-shaped sheath-core structure.
The second purpose of the invention is to provide a preparation method of the polylactic acid tow with the H-shaped sheath-core structure.
The first purpose of the invention is realized by the following technical scheme:
a single fiber in the polylactic acid tow with an H-shaped sheath-core structure comprises a sheath layer and a core layer, wherein the resin materials of the sheath layer and the core layer are polylactic acid, and the section of the single fiber is H-shaped.
According to one embodiment of the invention, the cross section of the single fiber is H-shaped, wherein a transverse structure in the middle of the H is a core layer structure, and two ends of the core layer structure are connected with two vertical structures to form a skin layer structure.
According to one embodiment of the invention, the section of the single fiber is H-shaped, wherein a transverse structure in the middle of the H is a core layer structure, and two groups of vertical structures are symmetrically arranged and connected on two sides of the core layer structure to form a skin layer structure.
According to one embodiment of the invention, the cross section of the single fiber is H-shaped, wherein the core layer structure is H-shaped, and four corners of the core layer structure H are connected with four vertical structures to form a skin layer structure.
The polylactic acid filament bundle with the H-shaped skin-core structure adopts the H-shaped skin-core structure, the occupation ratio of the skin layer structure is reduced, the contact surface of the core layer structure and air is increased, the heat dissipation of the core layer is facilitated, the crystallization degree is improved, a nucleating agent is not required to be added, and the crystallinity of the core layer structure can be improved on the premise of ensuring the bonding property.
Furthermore, the crystallization temperature of the polylactic resin of the core layer is 150-200 ℃.
Further, the crystallization temperature of the polylactic resin of the skin layer is 100-140 ℃.
In the present invention, the polylactic acid resin of the core layer and the polylactic acid resin of the skin layer may be a polylactic acid resin having a single crystallization temperature, or a mixture of polylactic acid resins having different crystallization temperatures.
Further, the weight ratio of the filaments of the core layer to the filaments of the skin layer is 1:2-10: 1.
The filament weight of the core layer can be increased by increasing the length of the "ones" in the "H" pattern or increasing the width of the "ones" in the "H" pattern.
Furthermore, the total denier of the filament bundle is 12-60 ktex, and the filament linear density is 2-30 dtex.
The second purpose of the invention is realized by the following technical scheme:
a preparation method of polylactic acid tows with H-shaped skin-core structures comprises the following steps:
s1) respectively drying the skin layer and the core layer;
s2) respectively sending the dried skin layer and the dried core layer into two sets of spinning systems for spinning and filtering;
s3), quantitatively inputting the mixture into a composite spinning assembly through a metering pump after filtering; forming composite fiber with H-shaped sheath-core structure by spinning;
s4) winding the obtained tow;
s5) drafting the tows in a hot water bath;
s6) drying and shaping.
Further, the drying process of S1 is: drying the resin of the skin layer for 2-4h at 40-60 ℃ in a drying environment, and drying the resin of the core layer for 6-10h at 80-100 ℃. The polylactic resin of cortex crystallization temperature is low, and the softening point is also lower, under the higher condition of stoving temperature, can appear the sticky condition. The core layer resin has higher crystallization temperature, and needs higher crystallinity when being used as a core layer, so the first condition is to remove the influence of moisture, and the drying at higher temperature and longer time is favorable for removing the moisture.
Further, in the spinning system of S2, the temperature of the screw zone for spinning the skin layer is 160-.
Further, a spinneret plate with H-shaped holes is used during spinning, and the diameter of the spinneret plate is
The spinneret plate is one or more of 400-2500 holes.
Further, the winding speed is controlled to be 200-1200 m/min; the drawing roll is 20-40HZ, and the feeding roll is 19-41 HZ.
Further, the drafting process is as follows: the first water bath is 55-85 ℃, the second water bath is 50-80 ℃, the first drafting rate is 40-60rpm, the second drafting rate is 70-200rpm, and the third drafting rate is 70-200 rpm; the draft magnification is 1.2 to 5 times.
Further, the drying temperature of S6 is 50-80 ℃, and the setting time is 10-20 min.
Compared with the prior art, the invention has the following beneficial effects:
(1) the polylactic acid tow with the H-shaped sheath-core structure has a composite H-shaped sheath-core structure, does not need to add a nucleating agent, improves the crystallinity of a core layer under the condition of ensuring the bonding property, and solves the problems of tow shrinkage, collapse and deformation of a formed filter rod and the like.
(2) According to the H-shaped sheath-core structure polylactic acid filament bundle, the core layer is made of the polylactic acid material with high crystallinity to solve the problem of thermal shrinkage, the sheath-core structure is made of the polylactic acid material with non-crystallinity, and the filament bundle is obtained by a composite spinning technology and has better thermal stability.
Drawings
FIG. 1 is a polylactic acid tow with an H-shaped sheath-core structure according to the invention;
FIG. 2 is a polylactic acid tow with an H-shaped sheath-core structure according to the invention;
FIG. 3 is a polylactic acid tow with an H-shaped sheath-core structure according to the invention;
the reference numbers in the figures are as follows: 1-skin layer structure and 2-core layer structure.
Detailed Description
The present invention is further described below in conjunction with specific examples to better understand and implement the technical solutions of the present invention for those skilled in the art.
Example 1
A preparation method of polylactic acid tows with H-shaped skin-core structures comprises the following steps:
2kg of polylactic resin with the crystallization temperature of 150 ℃ is selected as core layer resin and is put into an oven with the temperature of 80 ℃ for drying for 6 hours, and 4kg of polylactic resin with the crystallization temperature of 140 ℃ is selected as skin layer resin and is put into an oven with the temperature of 60 ℃ for drying for 4 hours. Then adding the materials into different double-screw extruders respectively. The temperature of the core layer twin-screw is set to be 195-215-245-250 ℃ according to gradient and the filtering temperature is 255 ℃. The sheath layer twin-screw is set at 200 ℃ for 160-. The diameter of the spinneret plate is 250mm, the spinneret holes are H-shaped, and the number of the holes is 1500. The mass ratio of the core layer to the skin layer is 1:2, the core layer and the skin layer are coiled at 200m/min and then are drawn in a water bath, the temperature of the water bath is 55 ℃ and 50 ℃, the drawing speed of the first pass is 60rpm, and the drawing speed of the second pass and the third pass are 72 rpm. And finally, shaping at the temperature of 60-58-55 ℃ to obtain the H-shaped sheath-core structure polylactic acid tows as shown in figure 1. And molding the obtained tows and 0.2kg of glycerol triacetate through a filter stick molding machine by a molding process to obtain the filter stick.
Example 2
A preparation method of polylactic acid tows with H-shaped skin-core structures comprises the following steps:
4kg of polylactic resin with the crystallization temperature of 200 ℃ is selected as core layer resin and is put into a 100 ℃ oven for drying for 10h, and 2kg of polylactic resin with the crystallization temperature of 100 ℃ is selected as skin layer resin and is put into a 40 ℃ oven for drying for 2 h. Then adding the materials into different double-screw extruders respectively. The temperature of the core layer twin-screw is set to be 250 ℃ for 225 ℃ for 235 ℃ for 245 ℃ for 260 ℃ for filtration. The sheath layer twin-screw is set as 190 ℃ for 160 ℃ for 170 ℃ for 175 ℃ for 180 ℃ for 200 ℃ for filtration. The diameter of the spinneret plate is 300mm, the spinneret holes are H-shaped, and the number of the holes is 8000. The mass ratio of the core layer to the skin layer is 10:1, the core layer and the skin layer are coiled at 1200m/min and then are drawn in a water bath, the temperature of the water bath is 85 ℃ and 80 ℃, the drawing speed of the first path is 50rpm, and the drawing speed of the second path and the drawing speed of the third path are 150 rpm. And finally, shaping at 80-75-70 ℃ to obtain the H-shaped sheath-core structure polylactic acid tows as shown in figure 2. And molding the obtained tows and 0.2kg of glycerol triacetate through a filter stick molding machine by a molding process to obtain the filter stick.
Example 3
A preparation method of polylactic acid tows with H-shaped skin-core structures comprises the following steps:
3kg of polylactic acid resin with the crystallization temperature of 180 ℃ is selected as core layer resin and is put into an oven with the temperature of 80 ℃ for drying for 8 hours, and 3kg of polylactic acid resin with the crystallization temperature of 120 ℃ is selected as skin layer resin and is put into an oven with the temperature of 50 ℃ for drying for 3 hours. Then adding the materials into different double-screw extruders respectively. The temperature of the core layer twin-screw is set to be 250 ℃ for 215 ℃ for 230 ℃ for 240 ℃ for 245 ℃ for 255 ℃ for filtration. The sheath layer twin-screw is set at 200 ℃ for 165-170-190-and 205 ℃ for filtration. The diameter of the spinneret plate is 200mm, the spinneret holes are H-shaped, and the number of the holes is 15000. The mass ratio of the core layer to the skin layer is 4:1, the core layer and the skin layer are coiled at 800m/min and then are drawn in a water bath, the temperature of the water bath is 70 ℃ and 65 ℃, the drawing speed of the first pass is 60rpm, and the drawing speed of the second pass and the third pass are 120 rpm. And finally, shaping at the temperature of 70-68-65 ℃ to obtain the H-shaped sheath-core structure polylactic acid tows as shown in figure 3. And molding the obtained tows and 0.2kg of glycerol triacetate through a filter stick molding machine by a molding process to obtain the filter stick.
Comparative example 1
A preparation method of polylactic acid tows comprises the following steps:
drying, mixing and granulating 4kg of polylactic resin with the crystallization temperature of 180 ℃ and 1kg of polylactic resin with the crystallization temperature of 120 ℃, heating and melting, putting into a spinning system, obtaining polylactic acid cigarette tows through conventional spinning, drafting, curling and drying, and forming with a filter stick forming machine through a forming process with 0.2kg of glycerol triacetate to obtain the filter stick.
Comparative example 2
A preparation method of polylactic acid tows comprises the following steps:
2kg of polylactic acid resin with the crystallization temperature of 180 ℃ as core layer resin and 2kg of polylactic acid resin with the crystallization temperature of 120 ℃ as skin layer resin are dried, mixed and granulated, heated and melted, then put into a spinning system, and are subjected to conventional spinning, drafting, curling and drying to obtain polylactic acid cigarette tows and 0.2kg of glyceryl triacetate, and the tows and the 0.2kg of glyceryl triacetate are formed through a forming process by a filter rod forming machine to obtain a filter rod.
Performance testing
And (3) testing heat resistance: after the tow sample is completely opened, a sample with a certain length L1(10mm or 25mm) is cut out, the sample is placed in a specified environment temperature for 30min, the length L2 is measured again, and the shrinkage L is calculated as follows:
the smaller the shrinkage L, the higher the heat resistance.
And (3) testing the bonding performance: the Shore hardness A adopts the standard GB/T22838.6-2009 to determine the 6 th part of the physical properties of cigarettes and filter sticks: hardness of
TABLE 1 Performance test results of polylactic acid tows obtained by different processes
The above embodiments illustrate various embodiments of the present invention in detail, but the embodiments of the present invention are not limited thereto, and those skilled in the art can achieve the objectives of the present invention based on the disclosure of the present invention, and any modifications and variations based on the concept of the present invention fall within the scope of the present invention, which is defined by the claims.
Claims (10)
1. The polylactic acid tow with the H-shaped sheath-core structure is characterized in that a single fiber in the tow comprises a sheath layer and a core layer, the resin materials of the sheath layer and the core layer are polylactic acid, and the section of the single fiber is H-shaped.
2. The H-shaped sheath-core polylactic acid tow as claimed in claim 1, wherein the crystallization temperature of the polylactic acid resin of the core layer is 150-200 ℃.
3. The H-shaped sheath-core polylactic acid tow as claimed in claim 1, wherein the polylactic acid resin crystallization temperature of the sheath layer is 100-140 ℃.
4. The H-shaped sheath-core structure polylactic acid tow as claimed in claim 1, wherein the weight ratio of the filaments of the core layer to the filaments of the sheath layer is 1:2-10: 1.
5. The H-shaped sheath-core structure polylactic acid filament bundle according to claim 1, wherein the total denier of the filament bundle is 12-60 ktex, and the filament linear density is 2-30 dtex.
6. A preparation method of the polylactic acid tow with the H-shaped sheath-core structure according to claim 1-5,
s1) respectively drying the skin layer and the core layer;
s2) respectively sending the dried skin layer and the dried core layer into two sets of spinning systems for spinning and filtering;
s3), quantitatively inputting the mixture into a composite spinning assembly through a metering pump after filtering; forming composite fiber with H-shaped sheath-core structure by spinning;
s4) winding the obtained tow;
s5) drafting the tows in a hot water bath;
s6) drying and shaping.
7. The method for preparing the polylactic acid tows with the H-shaped skin-core structures according to claim 6, wherein the drying treatment of S1 is as follows: drying the resin of the skin layer for 2-4h at 40-60 ℃ in a drying environment, and drying the resin of the core layer for 6-10h at 80-100 ℃.
8. The method for preparing the polylactic acid filament bundle with the H-shaped skin-core structure as claimed in claim 6, wherein in the spinning system of S2, the temperature of the screw zone for spinning the skin layer is 160-200 ℃, the temperature of the filter is 200-210 ℃, the temperature of the screw zone for spinning the core layer is 205-250 ℃, and the temperature of the filter is 250-260 ℃.
9. The preparation method of the H-shaped sheath-core structure polylactic acid tow according to claim 6, wherein the winding speed is controlled to be 200-1200 m/min; the drawing roll is 20-40HZ, and the feeding roll is 19-41 HZ.
10. The method for preparing the polylactic acid tow with the H-shaped skin-core structure according to claim 6, wherein the drawing process comprises the following steps: the first water bath is 55-85 ℃, the second water bath is 50-80 ℃, the first drafting rate is 40-60rpm, the second drafting rate is 70-200rpm, and the third drafting rate is 70-200 rpm; the draft magnification is 1.2 to 5 times.
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| CN202010946178.0A CN112251827A (en) | 2020-09-10 | 2020-09-10 | Polylactic acid tow with H-shaped sheath-core structure and preparation method thereof |
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| CN202010946178.0A CN112251827A (en) | 2020-09-10 | 2020-09-10 | Polylactic acid tow with H-shaped sheath-core structure and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115506041A (en) * | 2022-09-23 | 2022-12-23 | 云南中烟工业有限责任公司 | Preparation method of polylactic acid fiber filter stick with good temperature resistance |
| WO2024060501A1 (en) * | 2022-09-23 | 2024-03-28 | 云南中烟工业有限责任公司 | Preparation method for knife-hitting-preventing polylactic acid fiber filter stick |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115506041A (en) * | 2022-09-23 | 2022-12-23 | 云南中烟工业有限责任公司 | Preparation method of polylactic acid fiber filter stick with good temperature resistance |
| WO2024060501A1 (en) * | 2022-09-23 | 2024-03-28 | 云南中烟工业有限责任公司 | Preparation method for knife-hitting-preventing polylactic acid fiber filter stick |
| WO2024060502A1 (en) * | 2022-09-23 | 2024-03-28 | 云南中烟工业有限责任公司 | Preparation method for polylactic acid fiber filter rod with good temperature resistance |
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Application publication date: 20210122 |