CN115679475A - Composite fiber based on PA56 and preparation method and application thereof - Google Patents
Composite fiber based on PA56 and preparation method and application thereof Download PDFInfo
- Publication number
- CN115679475A CN115679475A CN202110827041.8A CN202110827041A CN115679475A CN 115679475 A CN115679475 A CN 115679475A CN 202110827041 A CN202110827041 A CN 202110827041A CN 115679475 A CN115679475 A CN 115679475A
- Authority
- CN
- China
- Prior art keywords
- roller
- composite fiber
- component
- fiber
- drafting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 100
- 239000002131 composite material Substances 0.000 title claims abstract description 74
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 29
- 229920000728 polyester Polymers 0.000 claims abstract description 22
- 239000004952 Polyamide Substances 0.000 claims abstract description 11
- 229920002647 polyamide Polymers 0.000 claims abstract description 11
- 239000013078 crystal Substances 0.000 claims abstract description 8
- 238000002844 melting Methods 0.000 claims description 18
- 230000008018 melting Effects 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 10
- 229920001778 nylon Polymers 0.000 claims description 6
- -1 polyethylene terephthalate Polymers 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000003063 flame retardant Substances 0.000 claims description 4
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 4
- 229920002215 polytrimethylene terephthalate Polymers 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 3
- 239000012792 core layer Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 239000006224 matting agent Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 239000004753 textile Substances 0.000 claims description 3
- 229920002292 Nylon 6 Polymers 0.000 claims description 2
- 229920000305 Nylon 6,10 Polymers 0.000 claims description 2
- 229920002302 Nylon 6,6 Polymers 0.000 claims description 2
- 239000012752 auxiliary agent Substances 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229920005992 thermoplastic resin Polymers 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 11
- 239000002932 luster Substances 0.000 abstract 1
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000000113 differential scanning calorimetry Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 229920006240 drawn fiber Polymers 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229920006118 nylon 56 Polymers 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 229920006306 polyurethane fiber Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Abstract
The invention relates to a PA 56-based composite fiber and preparation and application thereof, wherein the fiber is compounded by PA56 and a second component; the content of the gamma crystal form in the PA56 is 20-100%; the second component includes at least one of a polyester or a polyamide other than PA 56. The composite fiber has the characteristics of high strength, good hygroscopicity and good dyeability; and the dye has high binding firmness, and can still keep good color and luster, dimensional stability and intrinsic flame retardance after being washed for many times and rubbed for a long time in the using process.
Description
Technical Field
The invention relates to the field of fibers and preparation thereof, in particular to a composite fiber based on PA56 and a preparation method and application thereof.
Background
Common raw materials of clothes and home textiles mainly comprise polyester fibers, nylon fibers, polyurethane fibers, polyester fibers or composite fibers of the materials, and the like, and nylon fiber (also called polyamide fiber) materials are mainly used for manufacturing clothes due to good moisture absorption and air permeability.
The composite fiber is mainly formed by melting two polymers in a certain proportion in a composite spinning process, shunting the two polymers through a special distribution plate, and extruding and molding the two polymers through the same spinneret orifice, and the composite spun fiber mainly made of polyester and polyamide is reported more, such as CN101845686A, CN101845688A, CN103572399A, CN105177739A, CN107034529A, CN107699979A, CN108532026A, CN109554779A, CN109943913A, CN109943914A, CN111394829A.
The polyamide fiber has the advantages of light weight, wear resistance, fatigue resistance, high strength, easy dyeing, moisture absorption and the like, but the fabric is not stiff enough and has poor dimensional stability; polyester fibers have the advantages of high elasticity, high elastic recovery, high oil absorption, high impact resistance and the like, but have poor flame retardancy.
Disclosure of Invention
In order to solve the technical problem, the invention provides a PA 56-based composite fiber, which is formed by compounding PA56 and a second component; the content of the gamma crystal form in the PA56 is 20-100%; the second component includes at least one of a polyester or a polyamide other than PA 56.
According to the present invention, the content of the γ modification in the PA56 is 30 to 90%, such as 40 to 80%, such as 40 to 70%, for example, the content of the γ modification in the PA56 is 20%, 30%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 80%, 90%, 100%, or any point in the range of any two points.
According to the invention, the difference in melting point between the second component and PA56 is less than 50 ℃, preferably less than or equal to 20 ℃, for example 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃, 45 ℃.
According to the invention, the polyester is a linear thermoplastic resin, for example selected from the group consisting of polyethylene terephthalate PET, polybutylene terephthalate PBT, polytrimethylene terephthalate PTT.
According to the invention, the polyamide other than PA56 is chosen from polyamides having the above definition of the difference in melting point from PA56, for example from nylon 6, nylon 66, nylon 68, nylon 610 or nylon 65.
According to the present invention, the second component may further comprise one or more of a flame retardant, an anti-dripping agent or a matting agent.
According to the invention, the composite fiber is a composite fiber with a skin-core structure, wherein the component of the skin layer is the PA56, and the component of the core layer is the second component.
According to the invention, the diameter of the composite fiber monofilament is 5-30 μm, the sheath-core ratio is 9:1 to 1:9.
preferably, the monofilament diameter is 10 to 25 μm, more preferably 15 to 20 μm, such as 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm.
Preferably, the sheath-core ratio is 1:9-9:1, preferably the sheath-core ratio is 1:5-7:1, preferably the sheath-core ratio is 1:1-6:1, more preferably the sheath-core ratio is 5:4-5:3, for example 5:5, 5:4, 5:3, 5:2, 5:1.
According to the invention, the total titer (dtex/F number) of the composite fibre is greater than 55 linear density decitex per 48 filaments, preferably greater than 100dtex per 48 filaments, preferably greater than 200dtex per 48 filaments, more preferably greater than 400dtex per 48 filaments, for example the total titer of the sheath-core fibre is 56.9dtex, 66.2dtex, 115.9dtex, 140.6dtex, 207.7dtex, 428.6dtex per 48 filaments.
According to the invention, the breaking strength of the composite fiber is 2-6 cN/dtex, preferably the breaking strength is-63 cN/dtex, more preferably the breaking strength is 5-6 cN/dtex; for example, the breaking strength is 2.33cN/dtex, 2.62cN/dtex, 3.05cN/dtex, 3.63cN/dtex, 4cN/dtex, 5cN/dtex, 6cN/dtex.
According to the invention, the composite fiber has a modulus of 20 to 120cN/dtex, preferably a modulus of 30 to 100cN/dtex, preferably a modulus of 40 to 80cN/dtex, more preferably a modulus of 50 to 70cN/dtex, for example a modulus of 20cN/dtex, 30cN/dtex, 35cN/dtex, 45cN/dtex, 55cN/dtex, 60cN/dtex, 75cN/dtex, 80cN/dtex, 90cN/dtex, 100cN/dtex, 110cN/dtex.
According to the present invention, the elongation at break of the composite fiber is 5 to 85%, preferably, the elongation at break is 10 to 80%; preferably, the elongation at break is 10 to 70%; preferably, the elongation at break is 10 to 60%; preferably, the elongation at break is 10 to 50%; preferably, the elongation at break is 10 to 40%; preferably, the elongation at break is 10 to 30%; more preferably, the elongation at break is 10 to 20%; for example, the elongation at break is 5%, 7.40%, 15.76%, 19.5%, 28.4%, 38.8%, 43.7%, 52%, 58%, 60%, 70%, 75%, 80%.
According to the present invention, the crystallinity of the composite fiber is greater than 10%, preferably, the crystallinity of the composite fiber is greater than 20%, preferably, the crystallinity of the composite fiber is greater than 30%, preferably, the crystallinity of the composite fiber is greater than 40%; the degree of orientation of the composite fibers is greater than 0.8, preferably greater than 0.9, for example, the degree of crystallinity/orientation of the composite fibers is: 11.0%/0.81, 11.8%/0.82, 28.2%/0.78, 33.4%/0.86, 41.1%/0.81, 42.0%/0.91.
According to the invention, the melting range of the composite fiber is 220-280 ℃, preferably the melting range of the composite fiber is 220-275 ℃, preferably the melting range of the composite fiber is 230-255 ℃, for example 240-255 ℃.
According to the present invention, the melting point of the composite fiber is 220 to 260 ℃, preferably, the melting point of the composite fiber is 240 to 255 ℃, for example, the melting point of the composite fiber is 252 ℃.
According to the present invention, the double-core fiber is a composite fiber having an island-in-sea structure in which a sea component is the PA56 and an island component is the second component.
According to the invention, the second component also comprises an auxiliary agent, for example at least one selected from flame retardants, anti-dripping agents, matting agents. Illustratively, the additive may be the same or different in different islands.
The invention also provides a preparation method of the composite fiber based on PA56, which comprises the following steps:
preparing a sheath-core composite fiber by using a spinning-drawing one-step method by taking PA56 and a second component as raw materials; the method comprises the following steps of drawing and stretching by adopting a drawing roller assembly comprising a plurality of rollers, wherein the first roller of the drawing roller assembly is a cooling roller.
According to the invention, the preparation method comprises the following steps:
separately melt-extruding PA56 and the second component, feeding the melt-extruded PA and the second component to a pull roll assembly for pulling and stretching, wherein the pull roll assembly comprises a plurality of rolls arranged in sequence, wherein a first roll is a chill roll, and the first roll has a draft temperature of less than 15 ℃, preferably the first roll has a draft temperature of less than 20 ℃, preferably the first roll has a draft temperature of less than 25 ℃, for example the first roll has a draft temperature of 18 ℃, 19 ℃, 20 ℃, 21 ℃, 22 ℃, 23 ℃, 24 ℃ and 25 ℃.
The first roller enables the fibers to be rapidly cooled at the above temperature, increasing the content of the gamma crystalline form.
According to the invention, the first roller has a draft rate of greater than 500m/min;
according to the invention, the number of rollers in the pull roller assembly is 2n +1, said n ≧ 2, for example 2 or 3.
Preferably, the first roller and 2n +1 st roller are cooling rollers, the second roller, … …, and the 2n roller is a hot roller.
Preferably, the first roller, the second roller, … … and 2n +1 roller are sequentially disposed.
According to the invention, the drafting temperature of the second roller, … … and the 2n roller is the same or different and is 120-210 ℃.
Preferably, the second roll has a draft temperature of 130 to 200 ℃, preferably 140 to 190 ℃, preferably 150 to 180 ℃, more preferably 160 to 170 ℃, for example 120 ℃, 125 ℃, 130 ℃, 135 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃.
Preferably, the draft temperature of the third to 2 n-th rolls has the definition as described for the second roll draft temperature.
Illustratively, the rotational speed of the second roller is 1250m/min and the rotational speed of the third roller is 2650m/min.
Preferably, the drafting temperature of the 2n +1 th roller is < 15 ℃, preferably, the drafting temperature of the 2n +1 th roller is < 20 ℃, preferably, the drafting temperature of the 2n +1 th roller is < 25 ℃, for example, the drafting temperature of the 2n +1 th roller is 18 ℃, 19 ℃, 20 ℃, 21 ℃, 22 ℃, 23 ℃, 24 ℃ and 25 ℃.
The 2n +1 roller is a cooling roller, so that the fibers can be cooled and are convenient to wind.
Exemplarily, the drafting rate of the 2n +1 th roller is less than or equal to 3500m/min.
Exemplarily, n =2, the ratio of the draft rate of the fifth roller to the draft rate of the first roller is 1 to 7, preferably the ratio of the draft rate of the fifth roller to the draft rate of the first roller is 2 to 6, more preferably the ratio of the draft rate of the fifth roller to the draft rate of the first roller is 2 to 5, for example 1, 2, 2.5, 2.55, 2.6, 2.65, 2.7, 2.75, 2.8, 2.85, 2.9, 2.95, 3, 4, 5, 6, 7.
The drafting ratio increases the gamma crystal form in the obtained composite fiber, and simultaneously, the composite fiber has certain strength.
According to the invention, before melt extruding the PA56 and the second component separately, a step of drying the second component and/or the PA56 chip is further included.
Preferably, the PA56 has a drying temperature of 50 to 80 ℃, preferably 60 to 80 ℃, more preferably 65 to 75 ℃, e.g. 50 ℃, 55 ℃,58 ℃,62 ℃, 67 ℃, 70 ℃, 75 ℃, 80 ℃.
Preferably, the drying temperature of the second component is from 120 to 150 ℃, preferably from 125 to 145 ℃, more preferably from 130 to 140 ℃, for example 120 ℃, 123 ℃, 126 ℃, 134 ℃, 138 ℃, 141 ℃, 147 ℃, 150 ℃.
Preferably, the PA56 and/or the second component is dried for a time of 10 to 20 hours, preferably for a time of 12 to 18 hours, more preferably for a time of 14 to 16 hours, such as 10 hours, 11 hours, 15 hours, 17 hours, 19 hours, 20 hours.
According to the invention, the PA56 and the second component are melt-extruded separately and in different screw extruders.
Preferably, the PA56 is melt extruded in a first screw extruder, the melt temperature being 270 to 300 ℃, preferably 275 to 280 ℃, such as 270 ℃, 273 ℃, 276 ℃, 278 ℃, 280 ℃, 295 ℃, 300 ℃.
Preferably, the second component is melt extruded in a second screw extruder, the melt temperature being 280 to 300 ℃, preferably 283 to 290 ℃, such as 280 ℃, 283 ℃, 286 ℃, 288 ℃, 290 ℃, 295 ℃, 300 ℃.
Preferably, the length-diameter ratio of the first screw and the second screw is 24: 1. 32:1 or 48:1.
according to the invention, after the PA56 and the second component are respectively melt-extruded and before being fed into the drawing roll assembly, the method further comprises the step of extruding and molding the melt-extruded PA56 and the second component through a spinneret plate to obtain the primary fiber with the PA56 as the sheath and the second component as the core.
Preferably, the spinneret extrudes to form the second component in a ratio of PA56 to 5/5.
Preferably, the method further comprises the steps of cooling, bundling and oiling the nascent fiber.
Preferably, the number of holes of the spinneret plate is 32, 36 or 72 holes.
Preferably, the aspect ratio of the spinneret is 3/1 to 10/1, preferably 5/1 to 8/1, such as 3/1, 4/1, 5/1, 6/1, 7/1, 8/1, 9/1 or 10/1.
According to the invention, the method also comprises the step of hot box drawing after the primary fiber is oiled and passes through the drawing roller assembly.
According to the invention, the speed of the hot box drafting roller is 10-50 m/min; the drawing temperature is 150-190 ℃, and the rolling speed after hot drawing is 12m/min; the draft ratio is 1 to 1.5.
Preferably, the hot box drawing has a draft roller speed of 20 to 40m/min, more preferably 25 to 30m/min, for example, 10m/min, 15m/min, 20m/min, 25m/min, 30m/min, 35m/min, 40m/min, 45m/min, 50m/min.
Preferably, the hot box draw is at a draw temperature of 160 to 180 ℃, more preferably at a draw temperature of 165 to 170 ℃, e.g., 160 ℃, 165 ℃, 170 ℃, 175 ℃, 180 ℃.
Preferably, the draw ratio of the hot box draw is 1.1 to 1.4, preferably the draw ratio of the hot box draw is 1.2 to 1.3, for example the draw ratio of the hot box draw is 1.1, 1.2, 1.3, 1.4, 1.5.
The application of the PA 56-based composite fiber is used in clothing or home textiles.
The beneficial effects of the invention include:
the PA56 with the gamma crystal form content of 20-100% is used as a raw material, the drawing is carried out under the condition of a spinning-drawing one-step method, the first roller of the drawing roller assembly is a cooling roller, the drawing is carried out under the condition of lower temperature, the fiber can be rapidly cooled, the gamma crystal form content is increased, and the composite fiber with more perfect fiber crystallization is obtained, and has the characteristics of high strength, good hygroscopicity and good dyeability; and the dye has high binding firmness, and can still keep good color, dimension stability and intrinsic flame retardance after being washed by water for many times and rubbed for a long time in the using process.
The sheath-core composite fiber prepared by the method has the advantages of both the polyamide 56 and the second component, and realizes intrinsic flame retardance by regulating and controlling the crystalline structure (namely the content of gamma crystal form) of the polyamide 56 on the skin layer through a spinning process; the dimensional stability of the composite fiber is imparted in combination with the properties of the second component of the core layer.
Drawings
FIG. 1 is a cross-sectional profile of the PA56/PET skin-core composite oilless filament prepared in example 1;
FIG. 2 is a DSC of the PA56/PET sheath-core composite fiber prepared in example 1.
Detailed Description
The compounds of the general formula and the preparation and use thereof according to the present invention will be described in further detail with reference to the following examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
Unless otherwise indicated, the raw materials and reagents used in the following examples are all commercially available products or can be prepared by known methods.
Example 1
The sheath-core composite fiber of nylon 56 (PA 56) and Polyester (PET) is prepared by adopting a spinning-drawing one-step process and a hot box drawing process.
The conditions of the melt extrusion equipment were:
1) Preparing a single screw extruder with the diameter of 20mm, and the specification of a spinneret plate: the number of the holes is 48, the diameter is 0.28mm, and the length-diameter ratio is 3/1;
2) Melt extrusion conditions: the melt temperature was 280 ℃; the skin-core ratio was 5/5 (PA 56 for skin and PET for core).
The spinning-drawing one-step process conditions are as follows: (the temperature of the first roller cooling roll is 10-20℃.)
1) Feeding hot roller with a drafting section speed of 500m/min, a drafting temperature of 160 ℃, a rolling speed after hot drafting of 1250m/min and a drafting ratio of 2.5, and naming the obtained fiber as PA56/PET-5/5-500-2.5;
2) Feeding hot roller with drafting speed of 1000m/min, drafting temperature of 200 deg.C, rolling speed after hot drafting of 2650m/min, drafting ratio of 2.65, and naming the obtained fiber as PA56/PET-5/5-1000-2.65;
3) Feeding hot roller with drafting speed of 1000m/min, drafting temperature of 180 deg.C, winding speed of 3000m/min after hot drafting, drafting ratio of 3.0, and naming the obtained fiber as PA56/PET-5/5-1000-3.0;
4) Feeding hot roller at a drafting speed of 1500m/min, a drafting temperature of 180 ℃, a winding speed of 3000m/min after hot drafting, and a drafting ratio of 2.0, wherein the obtained fiber is named as PA56/PET-5/5-1500-2.0.
The hot box drafting process comprises the following steps:
further drafting the PA56/PET-5/5-1000-3.0 and PA56/PET-5/5-1500-2.0 fibers by adopting a hot box drafting process, wherein the drafting process comprises the following steps: feeding hot roller with drafting speed of 10m/min, drafting temperature of 175 deg.C, winding speed of 12m/min after hot drafting, drafting ratio of 1.2, and respectively naming the obtained fibers as PA56/PET-5/5-1000-3.0-D-1.2 and PA56/PET-5/5-1500-2.0-D-1.2.
TABLE 1 mechanical Properties of PA56/PET sheath-core composite fibers
As can be seen from Table 1, the maximum tensile strength of the PA56/PET sheath-core composite fiber is 3.63 +/-0.19 cN/dtex, and the fiber corresponding to the strength is prepared by adopting a spinning-drawing one-step method and a hot box drawing process which are fed into a hot roller drawing section and have the speed of 1000 m/min.
TABLE 2 degree of crystallinity and degree of orientation of PA56/PET sheath-core composite fibers
| Sample (I) | Degree of crystallinity (%) | Degree of orientation |
| PA56/PET-5/5-500-2.5 | 11.0 | 0.81 |
| PA56/PET-5/5-1000-2.65 | 11.8 | 0.82 |
| PA56/PET-5/5-1000-3.0 | 33.4 | 0.86 |
| PA56/PET-5/5-1000-3.0-D-1.2 | 42.0 | 0.91 |
| PA56/PET-5/5-1500-2.0 | 28.2 | 0.78 |
| PA56/PET-5/5-1500-2.0-D-1.2 | 41.1 | 0.81 |
The PA56/PET sheath-core composite fiber has the highest crystallinity and orientation degree, namely, the PA56/PET-5/5-1000-3.0-D-1.2 fiber is prepared by matching a spinning-drawing one-step method and a hot box drawing process, wherein the feeding speed of the spinning-drawing one-step method and the hot box drawing process is 1000 m/min.
See table 1 for a cross-sectional profile of the PA56/PET sheath-core composite oilless filament, wherein a is a cross-sectional profile corresponding to PA56/PET-5/5-500-2.5 and PA56/PET-5/5-1000-2.65; b is a corresponding sectional topography of PA56/PET-5/5-1000-3.0 and PA56/PET-5/5-1500-2.0, and the sections are all skin-core structures.
Referring to FIG. 2, except the PA56/PET-5/5-500-2.5 fiber shows a cold crystallization peak in the 122-134 ℃ range, no cold crystallization peak is observed on the DSC (differential scanning calorimetry) curve of the other PA56/PET skin-core composite drawn fibers, which indicates that the crystallization of the fibers is complete in the preparation process. In addition, the melting ranges of all the PA56/PET skin-core composite drawn fibers are in the range of 220-260 ℃ C, and the melting points are 252 ℃.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A PA 56-based composite fiber is characterized in that the fiber is formed by compounding PA56 and a second component; the content of the gamma crystal form in the PA56 is 20-100%; the second component includes at least one of a polyester or a polyamide other than PA 56.
2. The composite fiber according to claim 1, wherein the content of the gamma crystal form in the PA56 is 30-90%;
preferably, the polyester is a linear thermoplastic resin; also preferably, the polyester is selected from the group consisting of polyethylene terephthalate PET, polybutylene terephthalate PBT, polytrimethylene terephthalate PTT;
preferably, the polyamide other than PA56 is selected from nylon 6, nylon 66, nylon 68, nylon 610 or nylon 65.
Preferably, the second component may further include one or more of a flame retardant, an anti-dripping agent, or a matting agent.
3. The PA 56-based composite fiber according to claim 1 or 2, wherein the composite fiber is a composite fiber with a sheath-core structure, and in the sheath-core structure, a component of a sheath layer is the PA56, and a component of a core layer is the second component;
preferably, the difference in melting point of the second component and PA56 is less than 50 ℃, preferably less than 20 ℃;
preferably, the monofilament diameter of the composite fiber is 5-30 μm, the sheath-core ratio is 9:1 to 1:9;
preferably, the elongation at break of the composite fiber is 5 to 85%, preferably, the elongation at break is 10 to 80%; preferably, the elongation at break is 10 to 70%; preferably, the elongation at break is 10 to 60%; preferably, the elongation at break is 10 to 50%; preferably, the elongation at break is 10 to 40%; preferably, the elongation at break is 10 to 30%; more preferably, the elongation at break is 10 to 20%;
preferably, the crystallinity of the composite fiber is greater than 10%, preferably, the crystallinity of the composite fiber is greater than 20%, preferably, the crystallinity of the composite fiber is greater than 30%, preferably, the crystallinity of the composite fiber is greater than 40%; the orientation degree of the composite fiber is more than 0.8, and preferably the orientation degree of the composite fiber is more than 0.9;
preferably, the melting range of the composite fiber is 220-280 ℃, preferably, the melting range of the composite fiber is 220-275 ℃, and preferably, the melting range of the composite fiber is 230-255 ℃;
preferably, the melting point of the composite fiber is 220-260 ℃, and preferably, the melting point of the composite fiber is 240-255 ℃.
4. The PA 56-based composite fiber according to claim 1 or 2, wherein the multicore fiber is a composite fiber having an island-in-sea structure in which a sea component is the PA56 and an island component is the second component;
preferably, the second component further comprises at least one auxiliary agent of a flame retardant, an anti-dropping agent and a delustering agent;
preferably, the added auxiliaries may be the same or different in different islands.
5. A method for preparing a composite fibre based on PA56 according to any one of claims 1 to 4, characterized in that it comprises the following steps:
preparing a sheath-core composite fiber by using a spinning-drawing one-step method by taking PA56 and a second component as raw materials; the method comprises the following steps of drawing and stretching by adopting a drawing roller assembly comprising a plurality of rollers, wherein a first roller of the drawing roller assembly is a cooling roller.
6. The method of manufacturing according to claim 5, comprising the steps of:
respectively melting and extruding the PA56 and the second component, feeding the components into a drawing roller assembly for drawing and stretching, wherein the drawing roller assembly comprises a plurality of rollers which are sequentially arranged, the first roller is a cooling roller, and the drawing temperature of the first roller is less than 15 ℃;
preferably, the first roller has a draft temperature < 20 ℃;
preferably, the first roller has a draft temperature < 25 ℃;
for example, the first roll may have a draft temperature of 18 ℃, 19 ℃, 20 ℃, 21 ℃, 22 ℃, 23 ℃, 24 ℃ and 25 ℃.
Preferably, the first roller has a draft rate of greater than 500m/min.
7. The preparation method of composite fiber based on PA56 as claimed in claim 5 or 6, characterized in that the number of rollers in the pull roller assembly is 2n +1, n ≧ 2, such as 2 or 3;
preferably, the first roller and the 2n +1 st roller are cooling rollers, the second roller is … …, and the 2n roller is a hot roller;
preferably, the first roller, the second roller, … … and 2n +1 roller are arranged in sequence;
preferably, the draft temperature of the second roll, … …, 2n roll, is the same or different, from 120 to 210 ℃.
Preferably, the rotation speed of the second roller is 1250m/min, and the rotation speed of the third roller is 2650m/min.
8. The preparation method of composite fiber based on PA56 as claimed in any one of claims 5-7, wherein the 2n +1 roller is a cooling roller;
preferably, the drawing temperature of the 2n +1 roller is < 15 ℃,
preferably, the drafting temperature of the 2n +1 roller is less than 20 ℃,
preferably, the drafting temperature of the 2n +1 roller is less than 25 ℃,
for example, the drawing temperature of the 2n +1 st roller is 18 ℃, 19 ℃, 20 ℃, 21 ℃, 22 ℃, 23 ℃, 24 ℃ and 25 ℃;
preferably, the drawing speed of the 2n +1 roller is less than or equal to 3500m/min.
Preferably, the ratio of the drafting speed of the 2n +1 th roller to the drafting speed of the first roller is 1 to 7, preferably, the ratio of the drafting speed of the 2n +1 th roller to the drafting speed of the first roller is 2 to 6, and more preferably, the ratio of the drafting speed of the 2n +1 th roller to the drafting speed of the first roller is 2 to 5.
9. The method for preparing the PA 56-based composite fiber according to any one of claims 5 to 8, wherein before the PA56 and the second component are respectively melt-extruded, the method further comprises the step of drying the second component and/or PA56 slices.
Preferably, the PA56 and the second component are melt extruded separately, in different screw extruders.
Preferably, after the PA56 and the second component are melt-extruded separately and before being fed into the pull roll assembly, the method further comprises the step of extruding and molding the melt-extruded PA56 and the second component through a spinneret to obtain the primary fiber with the PA56 as the sheath and the second component as the core.
Preferably, the method further comprises the step of hot box drawing after the oiling of the nascent fiber and before the oiling of the nascent fiber is fed into a traction roller assembly;
preferably, the speed of a drawing roller for hot box drawing is 10-50 m/min; the drawing temperature is 150-190 ℃, and the rolling speed after hot drawing is 12m/min; the draft ratio is 1 to 1.5.
10. Use of a composite fibre based on PA56 according to any of claims 1 to 4, characterized in that it is used in clothing or home textiles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110827041.8A CN115679475A (en) | 2021-07-21 | 2021-07-21 | Composite fiber based on PA56 and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110827041.8A CN115679475A (en) | 2021-07-21 | 2021-07-21 | Composite fiber based on PA56 and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115679475A true CN115679475A (en) | 2023-02-03 |
Family
ID=85044629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110827041.8A Pending CN115679475A (en) | 2021-07-21 | 2021-07-21 | Composite fiber based on PA56 and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115679475A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844506A (en) * | 2006-04-04 | 2006-10-11 | 深圳市中晟纤维工程技术有限公司 | Method for production of island type composite industrial yarn |
| CN109943913A (en) * | 2017-12-20 | 2019-06-28 | 上海凯赛生物技术研发中心有限公司 | A kind of moisture-absorbing dyed crimped fibre of softness and preparation method thereof |
| CN112626626A (en) * | 2020-12-02 | 2021-04-09 | 军事科学院系统工程研究院军需工程技术研究所 | Polyamide 56 filament one-step continuous forming and flexible deformation preparation process and equipment |
-
2021
- 2021-07-21 CN CN202110827041.8A patent/CN115679475A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844506A (en) * | 2006-04-04 | 2006-10-11 | 深圳市中晟纤维工程技术有限公司 | Method for production of island type composite industrial yarn |
| CN109943913A (en) * | 2017-12-20 | 2019-06-28 | 上海凯赛生物技术研发中心有限公司 | A kind of moisture-absorbing dyed crimped fibre of softness and preparation method thereof |
| CN112626626A (en) * | 2020-12-02 | 2021-04-09 | 军事科学院系统工程研究院军需工程技术研究所 | Polyamide 56 filament one-step continuous forming and flexible deformation preparation process and equipment |
Non-Patent Citations (1)
| Title |
|---|
| 吴田田: "生物基尼龙56的结晶、动态热力学及流变性能研究", 中国优秀硕士学位论文全文数据库, no. 05, pages 6 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1108404C (en) | Drawn and composite shrinkage polyester continuous hollow filament yarn | |
| CN100585035C (en) | Core-skin type composite fiber and production method thereof | |
| US4867925A (en) | Process for the manufacture of polyester industrial yarn | |
| US10351973B2 (en) | Process for the preparation of a fiber, a fiber and a yarn made from such a fiber | |
| US20090035568A1 (en) | Polytrimethylene terephthalate hollow composite staple fibers and process for producing same | |
| US20070190884A1 (en) | Fabrics made of fibers having square cross section | |
| CN102586905A (en) | Hot-stretched Corterra pre-oriented filament yarn spinning and winding manufacturing process | |
| US20090311529A1 (en) | High tenacity thermoplastic polyurethane monofilament and process for manufacturing the same | |
| CN115679475A (en) | Composite fiber based on PA56 and preparation method and application thereof | |
| KR100742414B1 (en) | Process for multi spinning of nylon 6/polytrimethyleneterephthalate filaments | |
| EP1590511A2 (en) | Spin annealed poly(trimethylene terephthalate) yarn | |
| KR102575877B1 (en) | Core-sheath composite cross-sectional fiber with excellent hygroscopicity and wrinkle resistance | |
| US20120009418A1 (en) | Poly(trimethylene arylate) fibers, process for preparing, and fabric prepared therefrom | |
| JPS63526B2 (en) | ||
| CN1200775A (en) | Making high filament count fine filament polyester yarns | |
| JP4725200B2 (en) | Split type composite fiber excellent in uniform dyeability and method for producing the same | |
| JP2006336117A (en) | Method for producing polyester hollow yarn | |
| JPS58203112A (en) | Production of polyester fiber | |
| US20110263171A1 (en) | Poly(trimethylene arylate) fibers, process for preparing, and fabric prepared therefrom | |
| US5753168A (en) | Process for manufacturing high modulus, low shrinkage polyester monofilaments of very uniform diameters | |
| CN114103188A (en) | Preparation method of multifunctional flat yarn | |
| CN112251828A (en) | Preparation process of LMPET/PET sheath-core composite elastic fiber | |
| CN117802627A (en) | polyester/TPU functional composite fiber and preparation method thereof | |
| US8540912B2 (en) | Process of making poly(trimethylene arylate) fibers | |
| JP5141870B2 (en) | Fluorine resin monofilament, process for producing the same, and industrial fabric |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |