CN113279087B - Polylactic acid fiber with high hydrolysis resistance and preparation method thereof - Google Patents
Polylactic acid fiber with high hydrolysis resistance and preparation method thereof Download PDFInfo
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- CN113279087B CN113279087B CN202110537696.1A CN202110537696A CN113279087B CN 113279087 B CN113279087 B CN 113279087B CN 202110537696 A CN202110537696 A CN 202110537696A CN 113279087 B CN113279087 B CN 113279087B
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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
- 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
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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
- D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
- D01D10/02—Heat treatment
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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
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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
- D01D5/12—Stretch-spinning methods
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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
- 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
- D01F8/10—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained by reactions only involving carbon-to-carbon unsaturated bonds as constituent
Abstract
The invention discloses a preparation method of polylactic acid fiber with high hydrolysis resistance, which comprises the following steps: 1-15 wt% of low molecular weight polymethyl methacrylate and polylactic acid are blended, and the nascent fiber is prepared through melt spinning. In the spinning process, a shear force field gradient exists inside and outside a melt extruded from a spinneret orifice, polymethyl methacrylate migrates to a high shear field, a layer of polymethyl methacrylate protective film is further formed on the surface of the polylactic acid fiber, the effect of preventing water molecules in the environment from entering the fiber is achieved, the viscosity of the melt of the blend is improved due to the existence of a small amount of polymethyl methacrylate, the strength of the fiber is favorably improved, the finally obtained high-hydrolysis-resistance polylactic acid fiber is respectively soaked in sodium hydroxide aqueous solutions at 37 ℃ and 60 ℃ for 5 weeks and 132 hours, the mass loss rates are respectively 5.5 to 15.5wt% and 6.8 to 16.5wt%, and the tensile breaking strength of a monofilament is 445 to 547Mpa. The preparation method provided by the invention has the advantages of simple process, novel thought and easily obtained raw materials, and is suitable for industrial large-scale production of polylactic acid fibers.
Description
Technical Field
The invention belongs to the technical field of polylactic acid fibers and preparation thereof, and particularly relates to a high-hydrolysis-resistance polylactic acid fiber and a preparation method thereof.
Background
With the increasing of the global textile consumption level, the production capacity and the abandonment rate of the textile are increased year by year, and especially, the large use and abandonment of petroleum-based (difficult-to-degrade) synthetic fibers not only causes the waste of petroleum resources, but also pollutes the environment. Polylactic acid (PLA) is a thermoplastic polyester that can be synthesized from renewable plant resources and can be completely degraded into water and carbon dioxide in natural environments, and fiber products thereof have various excellent properties, such as good ultraviolet resistance, antibacterial properties, flame retardancy, drapability, etc., good hand feeling, high gloss (Progress in Polymer Science 2007,32, (4), 455-482), and have a very high application prospect in the field of fibers for clothing. However, the groups such as ester bonds in the PLA molecular chain are very vulnerable to water molecule attack and are broken, which causes poor hydrolysis resistance of PLA Fibers, and conventional fiber treatment methods, such as desizing, bleaching and dyeing, are required in an aqueous environment (Fibers and Polymers 2013,14, (11), 1912-1918). When PLA fiber is dyed for 90min under the conditions that the temperature is 110 ℃ and the pH value is 4, the tensile strength of the fiber is reduced by nearly 40 percent, the elongation at break is also reduced by 20 percent, the fiber becomes brittle and hard, the hand feeling and the service performance are sharply reduced (AATCC Review2003,3, (8), 56-61), and the normal use of the fiber fabric for clothes is difficult to meet. Therefore, in order to prepare high-performance PLA fibers that can be used in the field of textile fibers, it is urgently needed to find a simple and effective way to improve the hydrolysis resistance of PLA fibers on the premise of ensuring higher mechanical strength of the PLA fibers.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and firstly provides a preparation method of polylactic acid fiber with high hydrolysis resistance.
Another object of the present invention is to provide a polylactic acid fiber with high hydrolysis resistance prepared by the above method.
1. The invention provides a preparation method of polylactic acid fiber with high hydrolysis resistance, which is characterized in that the method blends low molecular weight polymethyl methacrylate and polylactic acid, then prepares nascent fiber by a melt spinning processing method, during the spinning process, a shearing force field gradient exists inside and outside a melt extruded by a spinneret orifice, the low molecular weight polymethyl methacrylate in the blended melt migrates to a high shearing field, and further forms a layer of polymethyl methacrylate protective film on the surface of the polylactic acid fiber, and prevents water molecules in the environment from entering the polylactic acid fiber to be hydrolyzed.
The preparation method of the polylactic acid fiber with high hydrolysis resistance is characterized by comprising the following process steps and conditions:
1) Fully mixing polylactic acid and polymethyl methacrylate, carrying out melt mixing at 170-210 ℃, and then granulating to obtain spinning slices, wherein the content of polymethyl methacrylate in the spinning slices is 1-15%;
2) Carrying out melt spinning on the obtained polylactic acid spinning slice with the polymethyl methacrylate content of 1-15 wt% at 180-220 ℃ to prepare polylactic acid nascent fiber, wherein the environmental temperature of the nascent fiber from a spinneret orifice to a winding roller is set to be 90-120 ℃, and the temperature of the winding roller is set to be 70-95 ℃;
3) The obtained polylactic acid nascent fiber is subjected to hot drawing at the temperature of 90-120 ℃ with the drawing ratio of 1.5-6, and is subjected to heat setting at the temperature of 95-125 ℃, and is rolled to obtain the polylactic acid fiber with high hydrolysis resistance.
The weight average molecular weight of the polymethyl methacrylate used in the above method is not more than 1X 10 5 g/mol。
The weight average molecular weight of the polylactic acid used in the method is more than or equal to 5.0 multiplied by 10 4 g mol-1, and the optical purity is more than or equal to 97.0 percent.
The melt mixing and melt spinning temperatures described in the above processes are preferably 190-210 ℃.
The hot stretching temperature described in the above method is preferably 102 to 115 ℃.
The content of polymethyl methacrylate in the polylactic acid fiber obtained by the method is preferably 5-10wt%.
2. The polylactic acid fiber with high hydrolysis resistance prepared by the method is characterized in that the content of polymethyl methacrylate in the fiber is 1-15 wt%, the crystallinity (calculated by the mass ratio) of polylactic acid is 48-54%, the orientation degree of the fiber is 0.16-0.21, the mass loss rate is 5.5-15.5 wt% after the fiber is soaked in a sodium hydroxide (NaOH) aqueous solution at 37 ℃ for 5 weeks, the mass loss rate is 6.8-16.5 wt% after the fiber is soaked in a NaOH aqueous solution at 60 ℃ for 132 hours, and the tensile breaking strength of a monofilament is 445-547 Mpa.
3. When the content of the polymethyl methacrylate in the high hydrolysis resistance polylactic acid fiber prepared by the method is 5-10wt%, the crystallinity (calculated by the occupied mass ratio) of the polylactic acid is 50-54%, the fiber orientation degree is 0.18-0.21, the mass loss rate is 8.5-13.5 wt% after the fiber is soaked in a NaOH aqueous solution at 37 ℃ for 5 weeks, the mass loss rate is 10.5-14.5 wt% after the fiber is soaked in a NaOH aqueous solution at 60 ℃ for 132 hours, and the tensile breaking strength of a monofilament is 475-547 Mpa.
Compared with the prior art, the invention has the following advantages:
1. the preparation method provided by the invention starts with blending modification and shearing induction of surface migration, low molecular weight polymethyl methacrylate with good compatibility and strong hydrolysis resistance with polylactic acid is blended in the polylactic acid, and the polymethyl methacrylate is induced to migrate to the surface of the polylactic acid under the action of a shearing gradient field at a spinneret orifice in the melt spinning process, so that a protective film with excellent hydrolysis resistance is formed on the surface of the polylactic acid fiber, and water molecules are effectively prevented from entering the interior of the polylactic acid. And after the polymethyl methacrylate is added into the polylactic acid matrix, the melt viscosity of the mixture in the spinning process is improved, so that the oriented structure of the fiber subjected to the action of a tensile force field is easier to maintain, and finally the orientation degree of a crystallization area is improved. Therefore, the method not only has ingenious conception, but also develops a simple and effective way for the research and development of the polylactic acid fiber with high hydrolysis resistance.
2. Because the high hydrolysis resistance polylactic acid fiber provided by the invention is blended with a small amount of polymethyl methacrylate in the traditional melt spinning process to improve the hydrolysis resistance of the polylactic acid fiber without damaging the mechanical property of the fiber, the preparation method has simple and high-efficiency process and low cost of fiber products, and is easy to realize industrial mass production.
3. Because the polymethyl methacrylate contained in the polylactic acid fiber provided by the invention can form a waterproof film on the surface of the polylactic acid fiber, the melt viscosity of the polylactic acid is increased, and the orientation degree of a crystallization area is improved, the orientation degree of the polylactic acid fiber is improved by 35.5% at most compared with that of the polylactic acid fiber without the polymethyl methacrylate, the mass loss rate is reduced by 75% at most after the polylactic acid fiber is soaked in a NaOH aqueous solution at 37 ℃ for 5 weeks, the mass loss rate is reduced by 72.2% at most after the polylactic acid fiber is soaked in a NaOH aqueous solution at 60 ℃ for 132 hours, and the tensile breaking strength of a monofilament is improved by 16.9% at most.
Drawings
Fig. 1 is a bar graph of wide angle X-ray diffraction (WAXD) orientation degree of the polylactic acid fibers obtained in examples 1 to 8 and comparative example 1 of the present invention, and it can be seen from the figure that the orientation degree of the polylactic acid fibers is improved to a certain extent with the addition of the polymethyl methacrylate, which shows that the polymethyl methacrylate with low molecular weight plays a role of enhancing the melt viscosity of the polylactic acid during the spinning process, and the internal orientation structure is stabilized during the hot drawing process of the polylactic acid fibers.
FIGS. 2 and 3 are graphs showing the mass loss rates of the polylactic acid fibers obtained in example 1 and comparative example 1 of the present invention after soaking in NaOH aqueous solutions at 37 ℃ and 60 ℃ for various periods of time. The curve comparison shows that the existence of the polymethyl methacrylate can greatly reduce the hydrolysis degree of the polylactic acid fiber, so that the polylactic acid fiber prepared by the invention has high hydrolysis resistance.
Detailed Description
The following examples are given to illustrate the present invention, but it should be understood that the following examples are only for illustrative purposes and are not to be construed as limiting the scope of the present invention.
In addition, it is worth mentioning that: 1) The tensile strength and crystallinity parameters of the fibers obtained in the following examples and comparative examples were measured by using YG001A monofilament tenacity meter, discovery 250 type Differential Scanning Calorimeter (DSC) test instrument manufactured by TA of USA, and the results are shown in Table 1. 2) The experimental test method for hydrolysis of the fibers obtained in the following examples and comparative examples is as follows: soaking (sealing) the fiber sample in NaOH aqueous solution with the pH value of 12, and placing for a certain time in a water bath environment in a constant temperature shaking table.
Example 1
The weight average molecular weight is 1.45X 10 5 g·mol -1 And the polylactic acid with the optical purity of 98.6 percent and the weight-average molecular weight of 6 multiplied by 10 4 Mixing the polymethyl methacrylate, adding the mixture into a double-screw extruder, and extruding and granulating at 190 ℃ to obtain spinning slices with the polymethyl methacrylate content of 5 wt%; and (2) carrying out melt spinning on the spinning slices according to a conventional mode, setting the temperature of a spinneret orifice (spinning temperature) to be 200 ℃, enabling a melt extruded from the spinneret orifice to pass through a hot roller at 80 ℃ and then enter hot stretching equipment, enabling the hot stretching temperature to be 100 ℃ and the stretching ratio to be 1.5, completing heat setting at 105 ℃, and finally winding to obtain the polylactic acid fiber with high hydrolysis resistance.
Example 2
The weight average molecular weight is 2.00X 10 5 g·mol -1 And the polylactic acid with the optical purity of 98.0 percent and the weight-average molecular weight of 4.9 multiplied by 10 4 Mixing the polymethyl methacrylate, adding the mixture into a double-screw extruder, and extruding and granulating at 180 ℃ to obtain spinning slices with the polymethyl methacrylate content of 10 wt%; and (2) carrying out melt spinning on the spinning slices according to a conventional mode, setting the temperature of a spinneret orifice (spinning temperature) to be 190 ℃, enabling melt extruded from the spinneret orifice to pass through a hot roller at 75 ℃, enabling the melt to enter hot stretching equipment, enabling the hot stretching temperature to be 100 ℃ and the stretching ratio to be 2.5, completing heat setting at 105 ℃, and finally rolling to obtain the polylactic acid fiber with high hydrolysis resistance.
Example 3
The weight average molecular weight is 2.81X 10 5 g·mol -1 And the polylactic acid with the optical purity of 98.9 percent and the weight-average molecular weight of 1.89 multiplied by 10 4 Mixing the polymethyl methacrylate, adding the mixture into a double-screw extruder, and extruding and granulating at 190 ℃ to obtain spinning slices with the polymethyl methacrylate content of 5 wt%; and (2) carrying out melt spinning on the spinning slices according to a conventional mode, setting the temperature of a spinneret orifice (spinning temperature) to be 200 ℃, enabling a melt extruded from the spinneret orifice to pass through a hot roller at 85 ℃, then entering hot stretching equipment, finishing heat setting at the hot stretching temperature of 110 ℃ and the stretching ratio of 3 at 115 ℃, and finally rolling to obtain the polylactic acid fiber with high hydrolysis resistance.
Example 4
The weight average molecular weight is 4.51X 10 5 g·mol -1 And the polylactic acid with the optical purity of 98.2 percent and the weight-average molecular weight of 2.4 multiplied by 10 4 Adding the mixed polymethyl methacrylate into a double-screw extruder, and extruding and granulating at 200 ℃ to obtain a spinning slice with the polymethyl methacrylate content of 7.5 wt%; and carrying out melt spinning on the spinning slices according to a conventional mode, setting the temperature of a spinneret orifice (spinning temperature) to be 210 ℃, enabling melt extruded from the spinneret orifice to pass through a hot roller at 90 ℃, then enabling the melt to enter hot stretching equipment, enabling the hot stretching temperature to be 110 ℃ and the stretching ratio to be 2.5, completing heat setting at 115 ℃, and finally winding to obtain the polylactic acid fiber with high hydrolysis resistance.
Example 5
The weight average molecular weight is 3.00X 10 5 g·mol -1 Optical purityPolylactic acid with a degree of 97.5% and a weight average molecular weight of 2.4X 10 4 Mixing the polymethyl methacrylate, adding the mixture into a double-screw extruder, and extruding and granulating at 200 ℃ to obtain spinning slices with the polymethyl methacrylate content of 10 wt%; and (2) carrying out melt spinning on the spinning slices according to a conventional mode, setting the temperature of a spinneret orifice (spinning temperature) to be 210 ℃, enabling melt extruded from the spinneret orifice to pass through a hot roller at 85 ℃, then enabling the melt to enter hot stretching equipment, enabling the hot stretching temperature to be 100 ℃ and the stretching ratio to be 4.6, completing heat setting at 105 ℃, and finally rolling to obtain the polylactic acid fiber with high hydrolysis resistance.
Example 6
The weight average molecular weight is 5.00X 10 5 g·mol -1 And the polylactic acid with the optical purity of 98.5 percent and the weight-average molecular weight of 7.5 multiplied by 10 4 Adding the mixed polymethyl methacrylate into a double-screw extruder, and extruding and granulating at 210 ℃ to obtain spinning slices with the polymethyl methacrylate content of 15 wt%; and (2) carrying out melt spinning on the spinning slices according to a conventional mode, setting the temperature of a spinneret orifice (spinning temperature) to be 220 ℃, enabling a melt extruded from the spinneret orifice to pass through a hot roller at 95 ℃ and then enter hot stretching equipment, enabling the hot stretching temperature to be 120 ℃ and the stretching ratio to be 6, completing heat setting at 125 ℃, and finally winding to obtain the polylactic acid fiber with high hydrolysis resistance.
Example 7
The weight average molecular weight is 0.50X 10 5 g·mol -1 And a polylactic acid having an optical purity of 99.3% and a weight-average molecular weight of 1.5X 10 4 Mixing the polymethyl methacrylate, adding the mixture into a double-screw extruder, and extruding and granulating at 170 ℃ to obtain spinning slices with the polymethyl methacrylate content of 5 wt%; and (2) carrying out melt spinning on the spinning slices according to a conventional mode, setting the temperature of a spinneret orifice (spinning temperature) to be 180 ℃, enabling a melt extruded from the spinneret orifice to pass through a hot roller at 70 ℃ and then enter hot stretching equipment, enabling the hot stretching temperature to be 90 ℃ and the stretching ratio to be 3, completing heat setting at 95 ℃, and finally winding to obtain the polylactic acid fiber with high hydrolysis resistance.
Example 8
The weight average molecular weight is 6.20X 10 5 g·mol -1 The optical purity of the polylactic acid is 97.0 percent, and the weight averageMolecular weight of 5.3X 10 4 Mixing the polymethyl methacrylate, adding the mixture into a double-screw extruder, extruding and granulating at 210 ℃ to obtain spinning slices with the polymethyl methacrylate content of 2.5 wt%; and carrying out melt spinning on the spinning slices according to a conventional mode, setting the temperature of a spinneret orifice (spinning temperature) to be 220 ℃, enabling a melt extruded from the spinneret orifice to pass through a hot roller at 95 ℃ and then enter hot stretching equipment, enabling the hot stretching temperature to be 120 ℃ and the stretching ratio to be 4.6, completing heat setting at 125 ℃, and finally winding to obtain the polylactic acid fiber with high hydrolysis resistance.
Comparative example 1
The weight average molecular weight is 1.45X 10 5 g·mol -1 Adding the polylactic acid with the optical purity of 98.6% into a double-screw extruder, and extruding and granulating at 190 ℃ to obtain spinning slices; and carrying out melt spinning on the spinning slices according to a conventional mode, setting the temperature of a spinneret orifice (spinning temperature) to be 200 ℃, enabling melt extruded from the spinneret orifice to pass through a hot roller at 80 ℃, then enabling the melt to enter hot stretching equipment, enabling the hot stretching temperature to be 100 ℃ and the stretching ratio to be 1.5, completing heat setting at 105 ℃, and finally winding to obtain the polylactic acid fiber.
In order to examine the relevant properties of the obtained polylactic acid fiber products, the degree of orientation of the fibers obtained in examples 1 to 8 and comparative example 1 was evaluated by wide-angle X-ray diffraction (WAXD), and the results are shown in FIG. 1; the fibers of example 1 of the invention and comparative example 1 were tested for hydrolytic mass loss after soaking for various periods of time with aqueous NaOH at pH 12 and the results are shown in fig. 2 (37 ℃) and fig. 3 (60 ℃). The polylactic acid fibers obtained in examples 1 to 8 and comparative example 1 were subjected to tensile properties and crystallinity measurement, and the results are shown in the following table.
The following table shows that after a certain amount of polymethyl methacrylate is added into the polylactic acid fiber, the damage to the crystallinity and tensile strength of the polylactic acid fiber is small, and when the addition amount of the polymethyl methacrylate is 5-10wt%, the crystallinity of polylactic acid molecules in the fiber is improved to a small extent, which shows that the addition of a small amount of polymethyl methacrylate plays a certain promotion role in the crystallization of the polylactic acid molecules in the system; when the amount of the polymethyl methacrylate added is 5-10wt%, the tensile strength of the fiber is improved to a certain extent, and the main reason is probably from the enhancement of the orientation degree of the fiber. After comprehensive analysis, the high hydrolysis resistance of the polylactic acid fiber is realized on the premise of not damaging the mechanical strength of the fiber after a certain amount of low molecular weight polymethyl methacrylate is added.
TABLE 1
Claims (2)
1. The preparation method of the polylactic acid fiber with high hydrolysis resistance is characterized in that: firstly, low molecular weight polymethyl methacrylate and polylactic acid are blended, then primary fiber is prepared by a melt spinning processing method, in the spinning process, a shearing force field gradient exists inside and outside a melt extruded by a spinneret orifice, the low molecular weight polymethyl methacrylate in the blended melt migrates to a high shearing field, and then a layer of polymethyl methacrylate protective film is formed on the surface of the polylactic acid fiber, water molecules in the environment are prevented from entering the polylactic acid fiber to be hydrolyzed, meanwhile, the melt viscosity of the mixture in the spinning process is improved due to the existence of the polymethyl methacrylate in a polylactic acid matrix, so that the orientation structure of the fiber is easier to maintain after the fiber is subjected to the action of a stretching force field, and finally, the improvement of the internal crystal structure of the polylactic acid is promoted by a thermal stretching post-treatment mode, and the orientation degree of the fiber is also improved, so that the polylactic acid fiber with high hydrolysis resistance is obtained;
the preparation method of the polylactic acid fiber with high hydrolysis resistance comprises the following steps:
a. fully mixing polylactic acid and polymethyl methacrylate, carrying out melt mixing at 170-210 ℃, and then granulating to obtain spinning slices, wherein the content of polymethyl methacrylate in the spinning slices is 1-15 wt%;
b. carrying out melt spinning on the obtained polylactic acid spinning slice with the polymethyl methacrylate content of 1-15wt% at 180-220 ℃ to prepare polylactic acid nascent fibers, wherein the environmental temperature of the nascent fibers from a spinneret orifice to a winding roll is set to be 90-120 ℃, and the temperature of the winding roll is set to be 70-95 ℃;
c. carrying out hot stretching on the obtained polylactic acid nascent fiber at the temperature of 90-120 ℃, wherein the stretching ratio is 1.5-6, carrying out hot setting at the temperature of 95-125 ℃, and rolling to obtain the polylactic acid fiber with high hydrolysis resistance;
the weight average molecular weight of the polymethyl methacrylate is less than or equal to 10 multiplied by 10 4 g/mol；
The weight average molecular weight of the polylactic acid is more than or equal to 5 multiplied by 10 4 g/mol, and the optical purity is more than or equal to 97 percent.
2. The high-hydrolysis-resistance polylactic acid fiber prepared by the method of claim 1 is characterized in that under the action of heat and a force field, polymethyl methacrylate in the blend is migrated to the surface of the polylactic acid fiber to form a polymethyl methacrylate film with excellent water resistance, the crystallinity of polylactic acid is 48 to 54 percent, the orientation degree of the fiber is 0.16 to 0.21, the content of polymethyl methacrylate is 1 to 15wt percent, the mass loss rate is 5.5 to 15.5wt percent after being soaked in a sodium hydroxide aqueous solution at 37 ℃ for 5 weeks, the mass loss rate is 6.8 to 16.5wt percent after being soaked in a NaOH aqueous solution at 60 ℃ for 132 hours, and the tensile breaking strength of a monofilament is 445 to 547MPa.
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