CN110983469A - Polylactic acid BCF bulked yarn, and preparation method and application thereof - Google Patents
Polylactic acid BCF bulked yarn, and preparation method and application thereof Download PDFInfo
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- CN110983469A CN110983469A CN201911332457.1A CN201911332457A CN110983469A CN 110983469 A CN110983469 A CN 110983469A CN 201911332457 A CN201911332457 A CN 201911332457A CN 110983469 A CN110983469 A CN 110983469A
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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
- D01D13/00—Complete machines for producing artificial threads
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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
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
-
- 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
- D01D5/12—Stretch-spinning methods
- D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
-
- 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
- D01D5/24—Formation of filaments, threads, or the like with a hollow 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
- 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
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/07—Addition of substances to the spinning solution or to the melt for making fire- or flame-proof filaments
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- 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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
- D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
- D02G1/04—Devices for imparting false twist
- D02G1/08—Rollers or other friction causing elements
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
- D02J1/08—Interlacing constituent filaments without breakage thereof, e.g. by use of turbulent air streams
Abstract
The invention provides polylactic acid BCF bulked yarn and a preparation method and application thereof. The polylactic acid bulked yarn is safe and environment-friendly when used for carpets and can replace the traditional wool and chemical fibers.
Description
Technical Field
The invention belongs to the technical field of bulked yarns, and particularly relates to a polylactic acid BCF bulked yarn, and a preparation method and application thereof.
Background
The carpet is a ground laying object which is formed by weaving, tufting or spinning natural fibers or chemical synthetic fibers such as cotton, hemp, wool, silk, grass and the like through a manual or mechanical process, and mainly plays the roles of safety, skid resistance, sound absorption, noise reduction, dust prevention, environmental protection, heat insulation, heat preservation and decoration, and the carpet raw materials mainly comprise wool, chinlon, polypropylene fiber and acrylic fiber.
The wool fiber has the advantages of soft hand feeling, good elasticity, bright color, thick texture, good antistatic property, difficult aging, abrasion and fading and good sound absorption capability; the disadvantages are easy worm damage, poor bacteria resistance and moisture resistance and poor batch stability. The chemical fiber carpet has the advantages of moderate price, stain resistance, difficult depilation, convenient cleaning, easy drying, no wrinkling and difficult fading; the chemical fiber carpet has the defects of poorer rebound resilience, heat preservation, light resistance and dyeing property than a wool carpet, flammability, easy generation of static electricity and dust adsorption, no skin affinity and allergic reaction to skin.
The common defect of both wool and the existing petrochemical fiber is poor flame retardant property, wherein the limit oxygen index of the wool is 24-25%, the polyamide is 21-24%, the polypropylene is 18% and the acrylic is 18%, bacteria and mites are easy to breed, and the wool is particularly serious and has a certain anaphylactic reaction; meanwhile, the source of wool is limited, and the wool is only suitable for high-end places, and petrochemical fibers are derived from petroleum and greatly used to influence the global ecological environment.
The polylactic acid fiber is a new fiber prepared by taking a lactic acid product generated by biologically fermenting non-grain crops (such as cassava, sugarcane, corn and the like) or straws as a raw material through a dehydration process and a melt spinning process, has similar performance to that of the traditional petrochemical fiber and the natural fiber, and has potential for replacing the traditional fiber; the environmental protection is good, the raw materials can be regenerated and discarded, and the emission of greenhouse gases is not increased; near absolute human safety: the intermediate lactic acid is a component contained in a human body, and PLA can be metabolized and absorbed by the human body; excellent health comfort: bacteriostasis, mite inhibition, skin friendliness, no allergy, ventilation and moisture permeability; the application of polylactic acid can relieve the problems of petroleum import, white pollution, global warming and agriculture and farmers.
However, there is no polylactic acid fiber for carpet products in the market, and therefore, there is a strong need to develop a polylactic acid bulked yarn to improve the safety and environmental protection of carpet products.
Disclosure of Invention
The invention aims to provide polylactic acid BCF bulked yarn, a preparation method and application thereof, which are applied to the carpet industry, partially replace traditional materials and provide high-quality safe and environment-friendly materials for consumers.
The invention provides the following technical scheme:
a preparation method of polylactic acid bulked yarn comprises the following steps:
1) drying and crystallizing: continuously drying and crystallizing the polylactic acid slices for 12-20h, wherein the dew point of dry air is less than or equal to minus 80 ℃, the temperature of the dry air is 80-120 ℃, a Roots blower is adopted for conveying, and the water content in the target polylactic acid is less than 30 ppm;
2) melt spinning: adopting a spinning process with 2 spinning heads per position, wherein the number of holes of a spinneret plate is 50-100, the diameter of the spinneret plate is 100mm, and the section of each spinneret hole is three-leaf or triangular hollow; the screw temperature for spinning is 210-250 ℃, wherein the screw 1 region is 210-220 ℃, the screw 2 region is 220-230 ℃, the screw 3 region is 230-240 ℃, the screw 4 region is 235-250 ℃ and the screw 5 region is 240-250 ℃; the temperature of the box body is 235-245 ℃; the spinning pressure is 8-15MPa, and the spinning speed is 800-1600 m/min;
3) devolatilizing: monomer lactide exists in the polylactic acid in a high-temperature molten state, a set of vacuum suction device is arranged right below the spinning manifold assembly to remove the lactide, and the air suction amount of a vacuum system is 1-4L/s;
4) cooling and oiling: cooling the fiber from the spinneret plate by side blowing, wherein the temperature of the side blowing is 17-25 ℃, the humidity is 50-85%, and the wind speed is 0.4-0.8 m/min;
5) drafting: the drafting roller adopts a roller built-in heating mode, the drafting is divided into two steps, the first step of drafting is carried out between the guide-in roller and the pre-drafting roller, and the second step of drafting is carried out between the pre-drafting roller and the main drafting roller; the speed of the lead-in roller is 800-1600m/min, and the temperature of the lead-in roller is 75-85 ℃; the speed of the pre-drawing roller is 800-1600m/min, and the temperature of the pre-drawing roller is 80-90 ℃; the speed of the main drawing roller is 1600-4800m/min, and the temperature of the main drawing roller is 90-115 ℃; the draft ratio is 2.0-3.0;
6) deformation: using a roller type deformer, wherein the pressure of the deformer is 0.5-1.0MPa, the temperature of the deformer is 110-150 ℃, and the deformation medium is hot air or hot steam;
7) and (3) cooling: cooling drum speed 50-60RPM, cooling residence time 0.5-2.5 s;
8) network: the pressure of the network device is 0.4-0.8MPa, and the front tension of the network device is 100-;
9) winding: the winding tension is 150cN, the speed of the first guide wire roller is 1580 and 4750m/min, and the speed of the two guide wire rollers is 1.01-1.02 times of the speed of the first guide wire roller.
Preferably, the polylactic acid raw material can be polylactic acid or modified polylactic acid.
Preferably, the polylactic acid raw material is flame-retardant modified polylactic acid.
Preferably, in the step 4), the oil agent is selected from 11823 model of Goulston in the United states, and the oil content is controlled to be 0.5-1.5%.
The polylactic acid bulked yarn prepared by the preparation method has 3.0-20dtex of single filament number, 600-4000dtex/100-200F of yarn specification, 2.2-3.5cN/dtex of breaking strength, 28-40% of elongation at break, 35-52% of hot crimping elongation and 20-28 meshes/meter.
The invention has the beneficial effects that: the polylactic acid bulked yarn prepared by the method has the following advantages when being applied to a carpet:
1. the flame retardant property is excellent, the limit oxygen index is 26-27%, the smoke generation is 53Sq.m/kg, and the flame retardant property is superior to that of the traditional wool and chemical fiber for carpet;
2. the carpet has the advantages that the carpet is bacteriostatic and acarid-inhibiting, the inhibition rate of three harmful bacteria is over 90 percent, the acarid-inhibiting rate is over 70 percent, and the problem of breeding of bacteria and acarids in the carpet is well solved;
3. the ecological environment is protected, the source is renewable, and the waste is degradable; the skin-friendly performance is excellent, lactic acid is an endogenous substance of a human body, and anaphylactic reaction does not exist;
4. the carpet prepared by using the polylactic acid bulked yarn is superior to the traditional material in the indexes of stain resistance, drying time and the like.
Detailed Description
Example 1
1. The polylactic acid bulked yarn is prepared by the following method:
drying and crystallizing: continuously drying and crystallizing the polylactic acid slices for 20 hours at the dry air dew point of-80 ℃ (atmospheric pressure) and the dry air temperature of 105 +/-1 ℃, wherein the water content in the target polylactic acid is 25 ppm.
Melt spinning: adopting a spinning process with 2 spinning heads per position, wherein the number of holes of a spinneret plate is 100, the diameter of the spinneret plate is 100mm, and the section of each spinneret hole is trilobal; the screw temperature for spinning is 210-250 ℃, wherein the screw temperature in the screw 1 region is 210 ℃, the screw 2 region is 225 ℃, the screw 3 region is 238 ℃, the screw 4 region is 243 ℃, and the screw 5 region is 240 ℃; the temperature of the box body is 240 ℃; the spinning pressure is 12MPa, and the spinning speed is 1100 m/min.
Devolatilizing: the vacuum suction device is of a porous structure, the external dimension of the vacuum suction device is the same as that of the spinning assembly, and the air suction amount of the vacuum system is 1L/s.
Cooling and oiling: the temperature of the cross air blowing is 18 ℃, the humidity is 65 percent, and the air speed is 0.5 m/min; the oil agent is selected from 11823 model of Goulston in America, and the oil content is controlled at 0.9%.
Drafting: the drafting roller adopts a roller built-in heating mode, the first-step drafting is carried out between the guide-in roller and the pre-drafting roller, and the second-step drafting is carried out between the pre-drafting roller and the main drafting roller; the speed of the lead-in roller is 1100m/min, and the temperature of the lead-in roller is 80 ℃; the speed of the pre-drawing roller is 1100m/min, and the temperature of the pre-drawing roller is 82 ℃; the speed of a main drawing roller is 2750m/min, and the temperature of the main drawing roller is 105 ℃; the draw ratio was 2.5.
Deformation: STM roller type deformer of Newmage company is selected to deform the filament bundle, the pressure of the deformer is 0.7MPa, the deformation medium is hot air, and the temperature of the deformer is 130 ℃.
And (3) cooling: cooling drum speed 55RPM, cooling residence time 2.5 s.
Network: the pressure of the network device is 0.4MPa, and the front tension of the network device is 100 cN.
Winding: the winding tension is 150cN, the speed of the guide wire one roller is 2750m/min, and the speed of the guide wire two rollers is 1.01 times of the speed of the guide wire one roller.
2. The polylactic acid bulked yarn indexes are as follows: the filament number of the single filament is 5.0dtex, the yarn specification is 1000dtex/200F, the breaking strength is 2.9cN/dtex, the elongation at break is 32 percent, the hot-crimping elongation is 45 percent, and the network degree is 25 +/-1/meter; the limiting oxygen index was 27% and the smoke generation was 53 Sq.m/kg.
Example 2:
1. preparing polylactic acid bulked yarn:
drying and crystallizing: continuously drying and crystallizing the polylactic acid slices for 15h, wherein the dry air dew point is-90 ℃ (normal pressure), the dry air temperature is 102 +/-1 ℃, and the water content in the target polylactic acid is 20 ppm.
Melt spinning: adopting a spinning process with 2 spinning heads per position, wherein the number of holes of a spinneret plate is 90, the diameter of the spinneret plate is 100mm, and the section of each spinneret hole is trilobal; the screw temperature for spinning is 210-250 ℃, wherein the screw temperature in the screw 1 region is 220 ℃, the screw 2 region is 235 ℃, the screw 3 region is 238 ℃, the screw 4 region is 245 ℃, and the screw 5 region is 240 ℃; the temperature of the box body is 242 ℃; the spinning pressure is 15MPa, and the spinning speed is 1500 m/min.
Devolatilizing: the vacuum suction device is of a porous structure (the shape and the size are the same as those of the spinning assembly), and the air suction amount of the vacuum system is 3L/s.
Cooling and oiling: the temperature of the cross air blowing is 18 ℃, the humidity is 78 percent, and the air speed is 0.8 m/min; the oil agent is selected from 11823 model of Goulston in America, and the oil content is controlled to be 1.5%.
Drafting: the drafting roller adopts a roller built-in heating mode, the first-step drafting is carried out between the guide-in roller and the pre-drafting roller, and the second-step drafting is carried out between the pre-drafting roller and the main drafting roller; the speed of the lead-in roller is 1500m/min, and the temperature of the lead-in roller is 82 ℃; the speed of a pre-drawing roller is 1500m/min, and the temperature of the pre-drawing roller is 85 ℃; the speed of a main drawing roller is 4000m/min, and the temperature of the main drawing roller is 115 ℃; the draw ratio was 2.67.
Deformation: STM roller type deformer from Newmage corporation, deformer pressure 1.0MPa, deforming medium hot air, deformer temperature 138 ℃ was used.
And (3) cooling: cooling drum speed 60RPM, cooling residence time 1.8 s.
Network: the pressure of the network device is 0.8MPa, and the front tension of the network device is 150 cN.
Winding: the winding tension is 150cN, the speed of the guide wire one roller is 4000m/min, and the speed of the guide wire two rollers is 1.02 times of the speed of the guide wire one roller.
2. The polylactic acid bulked yarn indexes are as follows: the filament number of the monofilament is 15.0dtex, the yarn specification is 2700dtex/180F, the breaking strength is 2.6cN/dtex, the elongation at break is 40 percent, the hot-crimping elongation is 52 percent, and the network degree is 21 +/-1/meter; the limiting oxygen index was 27% and the smoke generation was 53 Sq.m/kg.
Example 3:
1. preparing polylactic acid bulked yarn:
drying and crystallizing: continuously drying and crystallizing the polylactic acid slices for 18 hours at the dry air dew point of-90 ℃ (atmospheric pressure) and the dry air temperature of 103 +/-1 ℃, wherein the water content in the target polylactic acid is 19 ppm.
Melt spinning: adopting a spinning process with 2 spinning heads per position, wherein the number of holes of a spinneret plate is 80, the diameter of the spinneret plate is 100mm, and the section of each spinneret hole is in a single-hole triangle shape; the screw temperature of spinning is 210-250 ℃, wherein the screw temperature in a screw 1 area is 215 ℃, the screw temperature in a screw 2 area is 230 ℃, the screw temperature in a screw 3 area is 240 ℃, the screw temperature in a screw 4 area is 250 ℃, and the screw temperature in a screw 5 area is 242 ℃; the temperature of the box body is 245 ℃; the spinning pressure is 10MPa, and the spinning speed is 1300 m/min.
Devolatilizing: the vacuum suction device is of a porous structure, the external dimension of the vacuum suction device is the same as that of the spinning assembly, and the air suction amount of a vacuum system is 1L/s.
Cooling and oiling: the temperature of the cross air blowing is 18 ℃, the humidity is 70 percent, and the air speed is 0.5 m/min; the oil agent is selected from 11823 model of Goulston in America, and the oil content is controlled at 0.8%.
Drafting: the drafting roller adopts a roller built-in heating mode, the first-step drafting is carried out between the guide-in roller and the pre-drafting roller, and the second-step drafting is carried out between the pre-drafting roller and the main drafting roller; the speed of the lead-in roller is 1300m/min, and the temperature of the lead-in roller is 75 ℃; the speed of the pre-drawing roller is 1300m/min, and the temperature of the pre-drawing roller is 82 ℃; the speed of the main drawing roller is 3900m/min, and the temperature of the main drawing roller is 112 ℃; the draw ratio was 3.0.
Deformation: STM roller type deformer from Newmage corporation, deformer pressure 0.7MPa, deforming medium hot air, deformer temperature 140 deg.C was used.
And (3) cooling: cooling drum speed 50RPM, cooling residence time 2.0 s.
Network: the pressure of the network device is 0.6MPa, and the front tension of the network device is 120 cN.
Winding: the winding tension is 150cN, the speed of a guide wire roller is 3900m/min, and the speed of the guide wire roller is 1.01 times of the speed of the guide wire roller.
2. The polylactic acid bulked yarn indexes are as follows: the filament number of the monofilament is 20.0dtex, the yarn specification is 3200dtex/160F, the breaking strength is 2.2cN/dtex, the elongation at break is 33 percent, the hot-curling elongation is 45 percent, and the network degree is 27 +/-1/meter; the limiting oxygen index was 26% and the smoke generation was 53 Sq.m/kg.
Example 4:
1. preparing polylactic acid bulked yarn:
drying and crystallizing: continuously drying and crystallizing the polylactic acid slices for 14h, wherein the dry air dew point is-90 ℃ (atmospheric pressure), the dry air temperature is 103 +/-1 ℃, and the water content in the target polylactic acid is 21 ppm.
Melt spinning: adopting a spinning process with 2 spinning heads per position, wherein the number of holes of a spinneret plate is 50, the diameter of the spinneret plate is 100mm, and the section of each spinneret hole is a three-hole triangle; the screw temperature of the spinning is 210-250 ℃, wherein the screw temperature in a screw 1 area is 215 ℃, the screw temperature in a screw 2 area is 230 ℃, the screw temperature in a screw 3 area is 237 ℃, the screw temperature in a screw 4 area is 242 ℃, and the screw temperature in a screw 5 area is 240 ℃; the temperature of the box body is 242 ℃; the spinning pressure is 11MPa, and the spinning speed is 800 m/min.
Devolatilizing: the vacuum suction device is of a porous structure, the external dimension of the vacuum suction device is the same as that of the spinning assembly, and the air suction amount of a vacuum system is 1L/s.
Cooling and oiling: the temperature of the cross air blowing is 17 ℃, the humidity is 50 percent, and the air speed is 0.4 m/min; the oil agent is selected from 11823 model of Goulston in America, and the oil content is controlled at 0.5%.
Drafting: the drafting roller adopts a roller built-in heating mode, the first-step drafting is carried out between the guide-in roller and the pre-drafting roller, and the second-step drafting is carried out between the pre-drafting roller and the main drafting roller; the speed of the lead-in roller is 800m/min, and the temperature of the lead-in roller is 78 ℃; the speed of a pre-drawing roller is 800m/min, and the temperature of the pre-drawing roller is 83 ℃; the speed of the main drafting roller is 2000m/min, and the temperature of the main drafting roller is 92 ℃; the draw ratio was 2.5.
Deformation: STM roller type deformer from Newmage corporation, deformer pressure 0.5MPa, deforming medium hot air, deformer temperature 120 deg.C were used.
And (3) cooling: cooling drum speed 52RPM, cooling dwell time 0.9 s.
Network: the pressure of the network device is 0.5MPa, and the front tension of the network device is 110 cN.
Winding: the winding tension is 150cN, the speed of the guide wire one roller is 2000m/min, and the speed of the guide wire two rollers is 1.01 times of the speed of the guide wire one roller.
2. The polylactic acid bulked yarn indexes are as follows: the filament number of the single filament is 6.0dtex, the yarn specification is 600dtex/100F, the breaking strength is 2.3cN/dtex, the elongation at break is 35 percent, the thermal crimp elongation is 42 percent, and the network degree is 23 +/-1/meter; the limiting oxygen index was 27% and the smoke generation was 53 Sq.m/kg.
Example 5:
1. preparing polylactic acid bulked yarn:
drying and crystallizing: and (3) continuously drying and crystallizing the flame-retardant modified polylactic acid slices (the limiting oxygen index is 29%), wherein the time is 16h, the dry air dew point is-85 ℃ (normal pressure), the dry air temperature is 100 +/-1 ℃, and the water content in the target polylactic acid is 27 ppm.
Melt spinning: adopting a spinning process with 2 spinning heads per position, wherein the number of holes of a spinneret plate is 70, the diameter of the spinneret plate is 100mm, and the section of each spinneret hole is trilobal; the screw temperature for spinning is 210-250 ℃, wherein the screw temperature in the screw 1 region is 220 ℃, the screw 2 region is 225 ℃, the screw 3 region is 233 ℃, the screw 4 region is 242 ℃ and the screw 5 region is 238 ℃; the temperature of the box body is 238 ℃; the spinning pressure is 8MPa, and the spinning speed is 900 m/min.
Devolatilizing: the vacuum suction device is of a porous structure, the external dimension of the vacuum suction device is the same as that of the spinning assembly, and the air suction amount of a vacuum system is 1L/s.
Cooling and oiling: the temperature of the cross air blowing is 18 ℃, the humidity is 72 percent, and the air speed is 0.4 m/min; the oil agent is selected from 11823 model of Goulston in America, and the oil content is controlled to be 1.2%.
Drafting: the drafting roller adopts a roller built-in heating mode, the first-step drafting is carried out between the guide-in roller and the pre-drafting roller, and the second-step drafting is carried out between the pre-drafting roller and the main drafting roller; the speed of the lead-in roller is 900m/min, and the temperature of the lead-in roller is 80 ℃; the speed of a pre-drawing roller is 900m/min, and the temperature of the pre-drawing roller is 81 ℃; the speed of a main drawing roller is 1800m/min, and the temperature of the main drawing roller is 110 ℃; the draw ratio was 2.0.
Deformation: STM roller type deformer from Newcastle, with a deformer pressure of 0.6MPa and a deforming medium of hot air, the deformer temperature was 130 ℃.
And (3) cooling: cooling drum speed 52RPM, cooling dwell time 1.2 s.
Network: the pressure of the network device is 0.5MPa, and the front tension of the network device is 110 cN.
Winding: the winding tension is 150cN, the speed of the guide wire one roller is 1800m/min, and the speed of the guide wire two rollers is 1.01 times of the speed of the guide wire one roller.
2. The polylactic acid bulked yarn indexes are as follows: the filament number of the monofilament is 10.0dtex, the yarn specification is 1400dtex/140F, the breaking strength is 2.5cN/dtex, the elongation at break is 32 percent, the hot-crimping elongation is 45 percent, and the network degree is 24 +/-1/meter; the limiting oxygen index was 26% and the smoke generation was 53 Sq.m/kg.
Comparative analysis was performed with one size carpet (loop pile, 600 grams, 1/10 gauge, pile height 0.5mm) as follows:
the superscript notation in the above table means:
GB/T14252 + 2008 standard test;
2. stain test, AATCC in usa, 175-;
3. complete drying time;
GB/T20944.3-2008 standard test;
GB/T24253-;
ISO10993-2010 Standard test.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. 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 (7)
1. A preparation method of polylactic acid bulked yarn is characterized by comprising the following steps:
drying and crystallizing: continuously drying and crystallizing the polylactic acid slices for 12-20h, wherein the dew point of dry air is less than or equal to minus 80 ℃, the temperature of the dry air is 80-120 ℃, a Roots blower is adopted for conveying, and the water content in the target polylactic acid is less than 30 ppm;
melt spinning: spinning by adopting 2 spinning nozzles at each position, wherein the number of holes of a spinneret plate is 50-100, and the diameter of the spinneret plate is 100 mm; the screw temperature for spinning is 210-250 ℃, wherein the screw 1 region is 210-220 ℃, the screw 2 region is 220-230 ℃, the screw 3 region is 230-240 ℃, the screw 4 region is 235-250 ℃ and the screw 5 region is 240-250 ℃; the temperature of the box body is 235-245 ℃; the spinning pressure is 8-15MPa, and the spinning speed is 800-1600 m/min;
devolatilizing: monomer lactide exists in the polylactic acid in a high-temperature molten state, a set of vacuum suction device is arranged under the components of the spinning manifold to remove the lactide, and the air extraction amount of the vacuum suction device is 1-4L/s;
cooling and oiling: cooling the fiber from the spinneret plate by side blowing, wherein the temperature of the side blowing is 17-25 ℃, the humidity is 50-85%, and the wind speed is 0.4-0.8 m/min;
drafting: the drafting roller adopts a roller built-in heating mode, the drafting is divided into two steps, the first step of drafting is carried out between the guide-in roller and the pre-drafting roller, and the second step of drafting is carried out between the pre-drafting roller and the main drafting roller; the speed of the lead-in roller is 800-1600m/min, and the temperature of the lead-in roller is 75-85 ℃; the speed of the pre-drawing roller is 800-1600m/min, and the temperature of the pre-drawing roller is 80-90 ℃; the speed of the main drawing roller is 1600-4800m/min, and the temperature of the main drawing roller is 90-115 ℃; the draft ratio is 2.0-3.0;
deformation: using a roller type deformer, wherein the pressure of the deformer is 0.5-1.0MPa, the temperature of the deformer is 110-150 ℃, and the deformation medium is hot air or hot steam;
and (3) cooling: cooling drum speed 50-60RPM, cooling residence time 0.5-2.5 s;
network: the pressure of the network device is 0.4-0.8MPa, and the front tension of the network device is 100-;
winding: the winding tension is 150cN, the speed of the first guide wire roller is 1580 and 4750m/min, and the speed of the two guide wire rollers is 1.01-1.02 times of the speed of the first guide wire roller.
2. The method for preparing polylactic acid bulked yarn according to claim 1, wherein the polylactic acid is selected from polylactic acid or modified polylactic acid.
3. The method for preparing the polylactic acid bulked yarn according to claim 2, wherein the polylactic acid is a flame-retardant modified polylactic acid.
4. The method for producing a polylactic acid bulked yarn according to claim 2, wherein an oil content of the finish agent is controlled to 0.5 to 1.5% in the step of cooling and oiling.
5. The method of preparing a polylactic acid bulked yarn according to claim 1, wherein the cross-section of the spinneret hole in the melt spinning step is a trilobal or triangular hollow shape.
6. The polylactic acid bulked yarn prepared by the preparation method in claim 1, wherein the filament number is 3.0-20dtex, the yarn specification is 600-4000dtex/100-200F, the breaking strength is 2.2-3.5cN/dtex, the breaking elongation is 28-40%, the hot crimp elongation is 35-52%, and the network degree is 20-28/m.
7. The use of the polylactic acid bulked yarn prepared by the method of claim 1 in carpets.
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| CN111996636A (en) * | 2020-08-31 | 2020-11-27 | 浙江伟星实业发展股份有限公司 | Yarn capable of realizing complete degradation, zipper cloth belt and zipper |
| JP7373005B2 (en) | 2022-03-24 | 2023-11-01 | 東洋紡Ｓｔｃ株式会社 | biodegradable textile products |
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