CN105133081B - Thermal resistant polylactic acid fiber and preparation method thereof - Google Patents
Thermal resistant polylactic acid fiber and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a thermal resistant polylactic acid fiber and a preparation method thereof, and belongs to the technical field of fiber materials. The problem of how to increase the contact probability between PLLA and PDLA molecules is solved, the effect of high thermal resistance is achieved. The fiber is mainly composed of molecule A or molecule B grafted poly L-lactic acid copolymer and molecule A or molecule B grafted poly D-lactic acid copolymer, when grafting molecules in the grafted poly L-lactic acid copolymer and the poly D-lactic acid copolymer are different, the grafting molecules are molecules A or molecules B, and the molecules A are selected from molecules containing double bonds and hydroxide groups or anhydride; the molecules B are selected from molecules containing double bonds, epoxy groups and isocyanate groups. The method comprises the steps that the raw materials are mixed and put into a spinning machine to conduct melt spinning, and the thermal resistant polylactic acid fiber is obtained; higher thermal resistance and melting enthalpy effects are achieved, and the method is simple.
Description
Technical field
The present invention relates to a kind of heat-proof polylactic acid fiber and preparation method thereof, belongs to fibrous material technical field.
Background technology
Recent two decades, with the development of petrochemical industry macromolecular material, band give people it is convenient while, its nondegradable spy
Property also brings more serious Ecological and environmental problems.And this problem that appears as of degradation plastic is provided the most thoroughly
Solution.Degradation plastic wherein with polylactic acid (PLA) as representative is with the use similar to common non-degradable plastics
Performance, can be decomposed into the small-molecule substance of environmental sound after going out of use again in the short period of time.But, although,
Biodegradable fiber field, PLA can the spinning in common melt spinning machine, its fiber is closer to polyster fibre performance, but
It is, even across the PLA fiber (stretching ratios of higher stretching ratio>3 times), its heat resisting temperature is also less than 120 DEG C, so exists
Dye and exist during actually used the defect of heat contraction distortion.Also, as PLA is degradable resin, at high temperature
Spinning is also easy to produce decomposition, often makes the intensity and service life of material decrease.
Existing poly-lactic acid material has by adding crystallization nucleating agent to improve the heat-resisting of material in order to improve thermostability, also
Performance, so as to improve its application.Such as Chinese patent application (publication number：CN102409432A) disclose a kind of high-fire resistance to gather
Acid fiber and preparation method thereof, said composition are made up of PLLA, PDLA and alkyl fatty race salt, and which is mainly by adding knot
Brilliant nucleator is improving the thermostability of material, so that said composition has a single melting peak, and fiber has at 170 DEG C and presses
Boiling hot property, but as which adds alkyl fatty race salt material, have impact on the overall degradability of polylactic acid.Thirty years of age structure crystallization PLA's
Appearance can not only solve the heat resistance temperature of PLA fibers and provide solution, can be made with preferable degradability again.Vertical structure
Crystal is that by a pair of optical isomerism polylactic acid, i.e. PLLA and PDLA is collectively constituted, due to founding the fusing point of structure crystal than simple PLA
Fusing point be higher by about 50 DEG C, this causes the heat resisting temperature upper limit of PLA to have the possibility for further improving.But in real process,
, with the crystallization of vertical structure with simultaneous probability, once this thing happens, the performance of material can be serious for the equal crystalline polyimide of PLA
Deterioration.
The content of the invention
The present invention proposes a kind of heat-proof polylactic acid fiber and its preparation side for defect present in above prior art
Method, the problem of solution are how to increase the probability contacted between PLLA and PDLA molecules, high with heat resistance so as to realize
Effect.
An object of the present invention technical scheme is that, a kind of heat-proof polylactic acid fiber, should
The poly- D-ALPHA-Hydroxypropionic acid copolymer that fiber is mainly grafted by molecule A or molecule B grafting poly (l-lactic acid) copolymers and molecule A or molecule B
Constitute, the molecule being grafted in above-mentioned grafting poly (l-lactic acid) copolymer and the poly- D-ALPHA-Hydroxypropionic acid copolymer of grafting is molecule A when different or divides
Sub- B, and the molecule A is selected from the molecule containing double bond and also containing hydroxyl or anhydride；The molecule B is selected from containing double bond, ring
The molecule of epoxide and NCO.
The present inventor carries out substantial amounts of research by the vertical structure crystallization behavior and homopolymerization crystallization behavior to PLLA and PDLA and sends out
It is bright, by increasing the intermolecular interaction forces of PLLA and PDLA, increase the intermolecular contact probabilities of PLLA and PDLA, Neng Gouyou
Vertical structure in the raising system of effect crystallizes and effectively can also suppress the generation of equal crystalline polyimide, is more beneficial for the shape of vertical structure crystallization
Into, and in order to realize the effect above, the present inventor is by introducing the little of mutually reactive respectively between PLLA and PDLA molecules
Molecule, the PLLA and PDLA after the grafting accordingly of each self-forming, so that when fiber is prepared into, chemical reaction can be passed through,
The copolymer similar to ladder-shaped is formed, the trend of structure crystallization in increase system, is found, such molecular arrangement is conducive to PLLA
With being fully contacted for PDLA strands, and then the acid fiber by polylactic of high vertical structure crystalline content is generated, so as to make the polylactic acid for obtaining
Fiber has higher heat resistance, will not affect the overall performance effect of material because of the generation of equal crystalline polyimide again.
In above-mentioned heat-proof polylactic acid fiber, preferably, the molecule A is selected from acrylic acid, propenyl or maleic acid.
Preferably, the molecule B be selected from glycidyl methacrylate or (3- NCO -4- methyl) carbanilic acid -
2- propylenes.By being grafted using above-mentioned micromolecular compound, which includes between corresponding functional group being capable of more effective shape
Into reaction, so as to be more beneficial for improving the contact probability between PLLA and PDLA molecules, so as to be conducive to the formation of vertical structure crystallization,
Improve the effect of the heat resistance and higher melting enthalpy of fibrous material.
In above-mentioned heat-proof polylactic acid fiber, preferably, the molecule A or molecule B grafting poly (l-lactic acid) copolymers
The number-average molecular weight of the poly- D-ALPHA-Hydroxypropionic acid copolymer being grafted with molecule A or molecule B is independently each 5 × 104～5 × 105.It is relatively low
Molecular weight advantageously form the vertical structure crystallization of high level, but it is existing that the silk that floats, fracture of wire etc. are easily caused during melt spinning
As affecting stability of spinning process, and too high molecular weight being unfavorable for forming vertical structure crystallization, affect the thermostability of fiber.Therefore, pass through
Can realize that both there is higher vertical structure crystalline content, the fiber for enabling to again using the corresponding copolymers of above-mentioned molecular weight
With preferable stability.
In above-mentioned heat-proof polylactic acid fiber, preferably, the molecule A or molecule B grafting poly (l-lactic acid) copolymers
The mass ratio of the poly- D-ALPHA-Hydroxypropionic acid copolymer being grafted with molecule A or molecule B is 40：60～60：40.By adjusting each composition of material
Usage ratio, can more effectively improve combination effect between the two, meanwhile, the waste of raw material can be reduced again, reduce life
Produce cost.
The second object of the present invention technical scheme is that, a kind of system of heat-proof polylactic acid fiber
Preparation Method, the method are included the poly- D-ALPHA-Hydroxypropionic acid of molecule A or molecule B grafting poly (l-lactic acid) copolymers and molecule A or molecule B grafting
After the raw material of copolymer is mixed, melt spinning in spinning-drawing machine is put into, obtains corresponding heat-proof polylactic acid fiber.
The preparation method of the heat-proof polylactic acid fiber of the present invention, by the poly (l-lactic acid) copolymer that is grafted with small molecule and
Poly- D-ALPHA-Hydroxypropionic acid copolymer is directly as raw material, and is reacted by during melt spinning, making to be formed between small molecule, from
And the copolymer similar to ladder-shaped is formed, and the trend of structure crystallization is found in increase system, such molecular arrangement is conducive to
PLLA and PDLA strands are fully contacted, and then generate the acid fiber by polylactic of high vertical structure crystalline content, poly- so as to make to obtain
Acid fiber has higher heat resistance.So as to make the fiber of the present invention increase crystallization nucleating agent etc. in addition to carry
High-fire resistance, is also effectively guaranteed the degradability of product, is conducive to the protection of environment, reduces the pollution to environment.
In the preparation method of above-mentioned heat-proof polylactic acid fiber, preferably, the temperature of the spinning be 220 DEG C～
260℃.Not just to more preferable spinning, while can be more preferable between alsoing for more effectively ensureing the small molecule of grafting
Reaction is complete, improves and more fully contacts between PLLA and PDLA strands, improves overall vertical structure crystalline content, so as to effective
Ensure the heat resistance of product and with higher melting enthalpy.
In the preparation method of above-mentioned heat-proof polylactic acid fiber, preferably, the heat-proof polylactic acid fiber exists
70 DEG C～140 DEG C stretching orientations, stretching ratio is 2～6 times.Can effectively ensure that the shrinkage factor of fiber.
In sum, the present invention compared with prior art, with advantages below：
1. the heat-proof polylactic acid fiber of the present invention, can be mutual by directly being introduced between PLLA and PDLA molecules respectively
The small molecule of reaction, the PLLA and PDLA after the grafting accordingly of each self-forming, by increasing capacitance it is possible to increase PLLA and PDLA is intermolecular mutually
Active force, increases the intermolecular contact probabilities of PLLA and PDLA, so as to the vertical structure crystallization in effective raising system and can also
Effectively suppress equal crystalline polyimide, make with higher heat resistance and melting enthalpy；And crystallization nucleating agent need not be it is possible to additionally incorporate not
Degradable raw material is added, and is more beneficial for the degraded of material, is reduced the pollution to environment.
2. the preparation method of the heat-proof polylactic acid fiber of the present invention, with the simple and easily operated effect of technical process
Really；And this method is by the control to spinning temperature, it is more beneficial for more fully contacting between raising PLLA and PDLA strands,
Overall vertical structure crystalline content is improved, so that the heat resistance of product is effectively ensured and with higher melting enthalpy.
Specific embodiment
Below by specific embodiment, technical scheme is described in further detail, but the present invention is simultaneously
It is not limited to these embodiments.
Embodiment 1～5
In the present embodiment 1～5, molecule A grafting poly (l-lactic acid) copolymer can be prepared by the following method and obtain：
Poly (l-lactic acid) is added to premixing in homogenizer with molecule A and radical initiator uniformly, then, to add
Melting extrusion pelletize, 170 DEG C～220 DEG C of melting extrusion temperature in double screw extruder, obtain corresponding molecule A and are grafted poly- L-
Lactic acid copolymer.
In the present embodiment 1～5, the concrete consumption of each raw material is according to the weight ratio in table 1 below：
Table 1：
With in upper table 1：
The number-average molecular weight of PLLA is 5 × 104～5 × 105；
BPO represents dibenzoyl peroxide；
DCP represents cumyl peroxide；
DTBP represents di-t-butyl peroxide；
AAc represents acrylic acid；
AA1 represents propenyl；
MAH represents maleic acid.
Embodiment 6-10
In the present embodiment 6～10, the poly- D-ALPHA-Hydroxypropionic acid copolymer of molecule B grafting can be prepared by the following method and obtain：
Poly- D-ALPHA-Hydroxypropionic acid is added to premixing in homogenizer with molecule B and radical initiator uniformly, then, to add
Melting extrusion pelletize, 170 DEG C～220 DEG C of melting extrusion temperature in double screw extruder, obtain corresponding molecule B and are grafted poly- L-
Lactic acid copolymer.
In the present embodiment 6～10, the concrete consumption of each raw material is according to the weight ratio in table 2 below：
Table 2：
With in upper table 2：
The number-average molecular weight of PDLA is 5 × 104～5 × 105；
BPO represents dibenzoyl peroxide；
DCP represents cumyl peroxide；
DTBP represents di-t-butyl peroxide；
GMA represents glycidyl methacrylate；
TAI represents (3- NCO -4- methyl) carbanilic acid -2- propylenes.
Embodiment 11
A kind of acrylic acid-grafted poly- D-ALPHA-Hydroxypropionic acid copolymer, the concrete preparation method of the copolymer are consistent with embodiment 1, here
Repeat no more, differ only in and the PLLA in embodiment 1 is substituted for into PDLA, obtain corresponding acrylic acid-grafted poly- D- newborn
Acid copolymer.
Embodiment 12
A kind of propenyl is grafted poly- D-ALPHA-Hydroxypropionic acid copolymer, and the concrete preparation method of the copolymer is consistent with embodiment 2, here
Repeat no more, differ only in and the PLLA in embodiment 2 is substituted for into PDLA, obtain the poly- D- of corresponding propenyl grafting newborn
Acid copolymer.
Embodiment 13
A kind of maleic acid is grafted poly- D-ALPHA-Hydroxypropionic acid copolymer, and the concrete preparation method of the copolymer is consistent with embodiment 3, here
Repeat no more, differ only in and the PLLA in embodiment 3 is substituted for into PDLA, obtain the poly- D- of corresponding maleic acid grafting newborn
Acid copolymer.
Embodiment 14
A kind of glycidyl methacrylate graft poly (l-lactic acid) copolymer, the concrete preparation method of the copolymer is with real
Apply example 6 consistent, repeat no more here, differ only in and the PDLA in embodiment 6 is substituted for into PLLA, obtain corresponding first
Base glycidyl acrylate is grafted poly- D-ALPHA-Hydroxypropionic acid copolymer.
Embodiment 15
A kind of (3- NCO -4- methyl) carbanilic acid -2- propylenes grafting poly (l-lactic acid) copolymer, the copolymerization
The concrete preparation method of thing is consistent with embodiment 7, repeats no more here, differs only in and be substituted for the PDLA in embodiment 7
PLLA, obtains the poly- D-ALPHA-Hydroxypropionic acid copolymer of corresponding glycidyl methacrylate graft.
Embodiment 16
A kind of heat-proof polylactic acid fiber, its acrylic acid-grafted poly (l-lactic acid) copolymer 50 for mainly being obtained by embodiment 1
The composition of poly- 50 weight portion of D-ALPHA-Hydroxypropionic acid copolymer of the glycidyl methacrylate graft that weight portion and embodiment 6 are obtained.
Heat-proof polylactic acid fiber in the present embodiment can be prepared using following methods：
50 parts by weight of acrylic acid are grafted into poly (l-lactic acid) copolymer and the grafting of 50 weight parts of methacrylic acid ethylene oxidic esters
Poly- D-ALPHA-Hydroxypropionic acid copolymer raw material add homogenizer in carry out premixing it is uniform after, then, be put in spinning-drawing machine and melt
The temperature of spinning, wherein melt spinning is 235 DEG C, and stretching orientation is carried out at 100 DEG C, and stretching ratio is 6 times, obtains corresponding
Heat-proof polylactic acid fiber.
Embodiment 17
A kind of heat-proof polylactic acid fiber, its propenyl for mainly being obtained by embodiment 2 are grafted poly (l-lactic acid) copolymer 40
The poly- D-ALPHA-Hydroxypropionic acid of (3- NCO -4- methyl) carbanilic acid -2- propylenes grafting that weight portion and embodiment 7 are obtained is altogether
The composition of 60 weight portion of polymers.
Heat-proof polylactic acid fiber in the present embodiment can be prepared using following methods：
40 parts by weight propylene alcohol are grafted into poly (l-lactic acid) copolymer and 60 weight portions (3- NCO -4- methyl) phenylamino
Base formic acid -2- propylenes grafting poly- D-ALPHA-Hydroxypropionic acid copolymer raw material add homogenizer in carry out premixing it is uniform after, so
Afterwards, melt spinning in spinning-drawing machine is put into, the wherein temperature of melt spinning is 220 DEG C, and stretching orientation is carried out at 70 DEG C, stretching times
Rate is 3 times, obtains corresponding heat-proof polylactic acid fiber.
Embodiment 18
A kind of heat-proof polylactic acid fiber, its maleic acid for mainly being obtained by embodiment 3 are grafted poly (l-lactic acid) copolymer 60
The composition of poly- 40 weight portion of D-ALPHA-Hydroxypropionic acid copolymer of the glycidyl methacrylate graft that weight portion and embodiment 8 are obtained.
Heat-proof polylactic acid fiber in the present embodiment can be prepared using following methods：
60 parts by weight of maleic are grafted into poly (l-lactic acid) copolymer and the grafting of 40 weight parts of methacrylic acid ethylene oxidic esters
Poly- D-ALPHA-Hydroxypropionic acid copolymer raw material add homogenizer in carry out premixing it is uniform after, then, be put in spinning-drawing machine and melt
The temperature of spinning, wherein melt spinning is 245 DEG C, and stretching orientation is carried out at 110 DEG C, and stretching ratio is 5 times, obtains corresponding
Heat-proof polylactic acid fiber.
Embodiment 19
A kind of heat-proof polylactic acid fiber, its acrylic acid-grafted poly (l-lactic acid) copolymer 45 for mainly being obtained by embodiment 4
The poly- D-ALPHA-Hydroxypropionic acid of (3- NCO -4- methyl) carbanilic acid -2- propylenes grafting that weight portion and embodiment 9 are obtained is altogether
The composition of 55 weight portion of polymers.
Heat-proof polylactic acid fiber in the present embodiment can be prepared using following methods：
45 parts by weight of acrylic acid are grafted into poly (l-lactic acid) copolymer and 55 weight portions (3- NCO -4- methyl) phenylamino
Base formic acid -2- propylenes grafting poly- D-ALPHA-Hydroxypropionic acid copolymer raw material add homogenizer in carry out premixing it is uniform after, so
Afterwards, melt spinning in spinning-drawing machine is put into, the wherein temperature of melt spinning is 260 DEG C, and stretching orientation is carried out at 140 DEG C, is stretched
Multiplying power is 4 times, obtains corresponding heat-proof polylactic acid fiber.
Embodiment 20
A kind of heat-proof polylactic acid fiber, its propenyl for mainly being obtained by embodiment 5 are grafted poly (l-lactic acid) copolymer 50
The composition of poly- 50 weight portion of D-ALPHA-Hydroxypropionic acid copolymer of the glycidyl methacrylate graft that weight portion and embodiment 10 are obtained.
Heat-proof polylactic acid fiber in the present embodiment can be prepared using following methods：
50 parts by weight propylene alcohol are grafted into poly (l-lactic acid) copolymer and the grafting of 50 weight parts of methacrylic acid ethylene oxidic esters
Poly- D-ALPHA-Hydroxypropionic acid copolymer raw material add homogenizer in carry out premixing it is uniform after, then, be put in spinning-drawing machine and melt
The temperature of spinning, wherein melt spinning is 240 DEG C, and stretching orientation is carried out at 90 DEG C, and stretching ratio is 4 times, obtains corresponding
Heat-proof polylactic acid fiber.
Embodiment 21
A kind of heat-proof polylactic acid fiber, its acrylic acid-grafted poly- D-ALPHA-Hydroxypropionic acid copolymer 50 for mainly being obtained by embodiment 11
The composition of 50 weight portion of poly (l-lactic acid) copolymer of the glycidyl methacrylate graft that weight portion and embodiment 14 are obtained.
Heat-proof polylactic acid fiber in the present embodiment can be prepared using following methods：
50 parts by weight of acrylic acid are grafted into poly- D-ALPHA-Hydroxypropionic acid copolymer and the grafting of 50 weight parts of methacrylic acid ethylene oxidic esters
Poly (l-lactic acid) copolymer raw material add homogenizer in carry out premixing it is uniform after, then, be put in spinning-drawing machine and melt
The temperature of spinning, wherein melt spinning is 240 DEG C, and stretching orientation is carried out at 90 DEG C, and stretching ratio is 4 times, obtains corresponding
Heat-proof polylactic acid fiber.
Embodiment 22
A kind of heat-proof polylactic acid fiber, its propenyl for mainly being obtained by embodiment 12 are grafted poly- D-ALPHA-Hydroxypropionic acid copolymer 40
The poly (l-lactic acid) of (3- NCO -4- methyl) carbanilic acid -2- propylenes grafting that weight portion and embodiment 15 are obtained
The composition of 60 weight portion of copolymer.
Heat-proof polylactic acid fiber in the present embodiment can be prepared using following methods：
40 parts by weight propylene alcohol are grafted into poly- D-ALPHA-Hydroxypropionic acid copolymer and 60 weight portions (3- NCO -4- methyl) phenylamino
Base formic acid -2- propylenes grafting poly (l-lactic acid) copolymer raw material add homogenizer in carry out premixing it is uniform after, so
Afterwards, melt spinning in spinning-drawing machine is put into, the wherein temperature of melt spinning is 220 DEG C, and stretching orientation is carried out at 110 DEG C, is stretched
Multiplying power is 6 times, obtains corresponding heat-proof polylactic acid fiber.
Embodiment 23
A kind of heat-proof polylactic acid fiber, its maleic acid for mainly being obtained by embodiment 13 are grafted poly- D-ALPHA-Hydroxypropionic acid copolymer 60
The composition of 40 weight portion of poly (l-lactic acid) copolymer of the glycidyl methacrylate graft that weight portion and embodiment 14 are obtained.
Heat-proof polylactic acid fiber in the present embodiment can be prepared using following methods：
60 parts by weight of maleic are grafted into poly- D-ALPHA-Hydroxypropionic acid copolymer and the grafting of 40 weight parts of methacrylic acid ethylene oxidic esters
Poly (l-lactic acid) copolymer raw material add homogenizer in carry out premixing it is uniform after, then, be put in spinning-drawing machine and melt
The temperature of spinning, wherein melt spinning is 235 DEG C, and stretching orientation is carried out at 120 DEG C, and stretching ratio is 3 times, obtains corresponding
Heat-proof polylactic acid fiber.
Comparative example 1
By 100 weight portion PLLA (number-average molecular weights 8.5*104) spinning is carried out in melt spinning machine, spinning temperature is
230 DEG C and stretched under conditions of 75 DEG C, stretching ratio is 3 times, obtains PLLA fibers.
Comparative example 2
By 50 weight portion PLLA (number-average molecular weights 8.5*104) and 50 parts of PDLA (number-average molecular weights 7.7*104) in twin screw
In extruder, mixing extrusion pelletize, then carry out spinning in melt spinning machine, and spinning temperature is 240 DEG C and the bar at 85 DEG C
Stretched under part, stretching ratio is 4 times, obtains PLLA/PDLA blended fibers.
Randomly selecting the corresponding Zhang Wei that above-described embodiment 11-15 and comparative example 1 and 2 obtain carries out specific performance survey
Examination, concrete test result are as shown in table 3 below.
Table 3：
In table 3 "-" indicate without.
Specific embodiment described in the present invention is only explanation for example spiritual to the present invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
It is although having made a detailed description and being cited some specific embodiments to the present invention, skilled to this area
For technical staff, as long as it is obvious that can make various changes without departing from the spirit and scope of the present invention or correct.
Claims (8)
1. a kind of heat-proof polylactic acid fiber, it is characterised in that the fiber mainly by molecule A or molecule B grafting poly (l-lactic acid) altogether
Polymers and molecule A or molecule B are grafted poly- D-ALPHA-Hydroxypropionic acid copolymer composition, above-mentioned grafting poly (l-lactic acid) copolymer and the poly- D-ALPHA-Hydroxypropionic acid of grafting
It is molecule A or molecule B during the molecule difference being grafted in copolymer；
And above-mentioned molecule A is selected from the molecule containing double bond and also containing hydroxyl or anhydride；The molecule B is selected from containing double bond, ring
The molecule of epoxide and NCO.
2. heat-proof polylactic acid fiber according to claim 1, it is characterised in that the molecule A is selected from acrylic acid, propenyl
Or maleic acid.
3. heat-proof polylactic acid fiber according to claim 1 or claim 2, it is characterised in that the molecule B is selected from methacrylic acid
Ethylene oxidic ester or (3- NCO -4- methyl) carbanilic acid -2- propylenes.
4. heat-proof polylactic acid fiber according to claim 3, it is characterised in that it is newborn that the molecule A or molecule B is grafted poly- L-
The number-average molecular weight of the poly- D-ALPHA-Hydroxypropionic acid copolymer of acid copolymer and molecule A or molecule B grafting is independently each 5 × 104～5 ×
105。
5. heat-proof polylactic acid fiber according to claim 3, it is characterised in that it is newborn that the molecule A or molecule B is grafted poly- L-
The mass ratio of the poly- D-ALPHA-Hydroxypropionic acid copolymer of acid copolymer and molecule A or molecule B grafting is 40：60～60：40.
6. it is a kind of such as the preparation method of claim 1-5 any one heat-proof polylactic acid fiber, it is characterised in that the method bag
The raw material for including the poly- D-ALPHA-Hydroxypropionic acid copolymer by molecule A or molecule B grafting poly (l-lactic acid) copolymers and molecule A or molecule B grafting enters
After row mixing, melt spinning in spinning-drawing machine is put into, corresponding heat-proof polylactic acid fiber is obtained.
7. the preparation method of heat-proof polylactic acid fiber according to claim 6, it is characterised in that the temperature of the spinning is
220 DEG C～260 DEG C.
8. the preparation method of heat-proof polylactic acid fiber according to claim 7, it is characterised in that the heat-proof polylactic acid
Fiber is 2～6 times in 70 DEG C～140 DEG C stretching orientations, stretching ratio.
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