Wear-resistant environment-friendly spunlace non-woven fabric and preparation method thereof

Abstract

The invention relates to a wear-resistant environment-friendly spunlace non-woven fabric which is composed of two-component fibers of a high-shrinkage polyester / modified polylactic acid parallel structure, and the modified polylactic acid is prepared by carrying out melt grafting on carboxyl-terminated polylactic acid through maleic anhydride and then reacting with chitosan, polyether polyamine and trimesoyl chloride; the use amount of the maleic anhydride is 5-8wt% of the carboxyl-terminated polylactic acid; the mass ratio of the maleic anhydride to the chitosan to the polyether polyamine to the trimesoyl chloride is 1 to (1.2 to 1.5) to (0.4 to 0.6) to (0.05 to 0.08). The spunlace non-woven fabric has excellent wear resistance and good biodegradability, is skin-friendly and soft, and has both wear resistance and environmental friendliness.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-woven fabrics, and particularly relates to a wear-resistant and environmentally friendly spunlace non-woven fabric and a preparation method thereof. Background Art

[0002] Non-woven fabric, also known as non-woven cloth, is composed of oriented or random fibers. Due to its good air permeability and softness, it is widely used in the fields of medical and health, industrial and agricultural products, etc. However, most non-woven fabrics are difficult to biodegrade, causing environmental pollution. For example, polypropylene fiber-based non-woven fabrics have excellent chemical resistance and wear resistance, but they are difficult to degrade and have poor skin-friendly softness. Therefore, the application of biodegradable materials in non-woven fabrics has become one of the focuses of attention. However, the mechanical properties of conventional biodegradable materials in the prior art are very limited. For example, polylactic acid fiber is made from renewable resources such as corn, wheat, and potatoes. It is environmentally friendly and easy to degrade, and has good skin-friendly properties. It is a good biodegradable material, but its mechanical strength is poor, which limits its application in wear-resistant non-woven fabrics.

[0003] Patent CN102336961B and patent CN 102336929B respectively disclose a heavy calcium carbonate and corn starch-modified PP spunbond non-woven fabric composite material and a corn starch-modified PP spunbond non-woven fabric, both of which have environmental protection functions and are degradable. However, the addition of corn starch results in a decrease in the breaking strength of the non-woven fabric and poor wear resistance. Therefore, it is necessary to develop a non-woven fabric that can balance environmental protection and wear resistance. Summary of the Invention

[0004] In view of the problem that general non-woven fabrics in the prior art cannot balance environmental protection and wear resistance, the present invention provides a wear-resistant and environmentally friendly spunlace non-woven fabric and a preparation method thereof. The present invention uses high shrinkage polyester (HSPET) and modified polylactic acid to perform bicomponent spinning in a side-by-side structure to obtain composite fibers, and then obtains a skin-friendly, environmentally friendly and wear-resistant non-woven fabric through carding and web formation and spunlace process.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A wear-resistant and environmentally friendly spunlace non-woven fabric is composed of bicomponent fibers with a side-by-side structure of high shrinkage polyester / modified polylactic acid. The modified polylactic acid is obtained by melt grafting maleic anhydride onto carboxyl-terminated polylactic acid, and then reacting with chitosan, polyether polyamine, and trimellitic acid chloride. The dosage of maleic anhydride is 5-8 wt% of carboxyl-terminated polylactic acid. The mass ratio of maleic anhydride, chitosan, polyether polyamine, and trimellitic acid chloride is 1:(1.2-1.5):(0.4-0.6):(0.05-0.08).

[0007] Furthermore, the mass ratio of maleic anhydride, chitosan, polyether polyamine and trimesoyl chloride is 1:(1.3-1.4):(0.4-0.5):(0.06-0.07).

[0008] Furthermore, the modified polylactic acid is prepared by a preparation method comprising the following steps:

[0009] (L1) melt-grafting carboxyl-terminated polylactic acid, maleic anhydride and an initiator to obtain grafted polylactic acid;

[0010] (L2) The grafted polylactic acid, chitosan, polyether polyamine and catalyst are dissolved in a solvent, reacted at 5-10°C for 2-4 hours under an inert atmosphere, and then heated to 60-80°C to continue the reaction for 2-4 hours; then trimesoyl chloride and an acid binding agent are added, reacted at 10-25°C for 0.5-1 hour, and after the reaction is completed, the modified polylactic acid is obtained by rotary evaporation and drying.

[0011] Preferably, in step (L1), the initiator is selected from at least one of dicumyl peroxide and di-tert-butyl peroxide, and the amount of the initiator is 0.1-0.2wt% of the terminal carboxyl polylactic acid; the conditions for the melt grafting are: carried out in a twin-screw extruder, the reaction temperature is 180-200°C, and the time is 0.5-1.5h.

[0012] Preferably, in step (L2), the catalyst is at least one of FeCl3 and AlCl3, and the amount of the catalyst is 0.5-0.8wt% of chitosan; the solvent is a mixture of a polar aprotic organic solvent and an organic acid, wherein the volume proportion of the organic acid is 1-3%, the polar aprotic organic solvent is at least one of N,N-dimethylacetamide, N,N-dimethylformamide, and N-methylpyrrolidone, and the organic acid is at least one of acetic acid, oxalic acid, and citric acid. The addition of the organic acid can improve the solubility of chitosan.

[0013] Preferably, in step (L2), the inert atmosphere is nitrogen and / or argon.

[0014] Preferably, in step (L2), the acid binding agent is selected from at least one of triethylamine and pyridine, and the mass of the acid binding agent is 1.5 to 2.0 times that of trimesoyl chloride.

[0015] Furthermore, in the bi-component fiber of the parallel structure, the mass proportion of modified polylactic acid is 40-50%, and the rest is high shrinkage polyester.

[0016] Furthermore, the fineness of the parallel-structured two-component fiber is 1.5 to 3.0 dtex, and the length is 30 to 50 mm; the parallel-structured two-component fiber is prepared by a preparation method comprising the following steps: adding modified polylactic acid to an extruder for heating and melting, entering the spinning die through a melt filter, a melt delivery pipe, and a metering pump, and being evenly distributed to the first spinning assembly through the spinning die; adding high-shrinkage polyester to another extruder for heating and melting, entering the spinning die through a melt filter, a melt delivery pipe, and a metering pump, and being evenly distributed to the second spinning assembly through the spinning die; performing composite spinning at the outlet, and cooling, stretching, winding, and cutting to prepare the parallel-structured two-component fiber.

[0017] Preferably, the high shrinkage polyester and modified polylactic acid are dried at 65-80°C for 8-12 hours before being added to the extruder, and the temperature of the composite spinning is 230-250°C.

[0018] Furthermore, the intrinsic viscosity of the high shrinkage polyester is 0.65-0.72 dl / g, and the melting point is 200-220°C. High shrinkage polyester is a differentiated polyester with a high shrinkage rate, which is generally obtained by introducing a third monomer for copolymerization during the polyester synthesis process. The introduction of the third monomer destroys the regularity of the molecular chain and increases the shrinkage rate. For example, dimethyl terephthalate (DMT) and ethylene glycol (EG) are used as raw materials, and a third monomer dimethyl isophthalate (DMI) is added to obtain high shrinkage polyester. The high shrinkage polyester described in the present invention can be obtained commercially.

[0019] Furthermore, the intrinsic viscosity of the carboxyl-terminated polylactic acid is 1.30-1.50 dl / g, and the melting point is 160-190°C.

[0020] Furthermore, the intrinsic viscosity of the chitosan is 2.0-2.5 dl / g, and the deacetylation degree is 80-90%. The deacetylation degree affects the reactivity and mechanical properties of chitosan. A high deacetylation degree results in high strength and high reactivity, but a high deacetylation degree results in high brittleness and poor solubility, which is detrimental to the performance of the final bicomponent fiber and brings inconvenience to the preparation process.

[0021] Furthermore, the polyether polyamine is at least one of polyether diamine and polyether triamine, and the number average molecular weight of the polyether polyamine is 400-1000.

[0022] In a second aspect, the present invention also provides a method for preparing the above-mentioned wear-resistant and environmentally friendly spunlace non-woven fabric, comprising the following steps: opening and combing the two-component fibers of the parallel structure of high-shrinkage polyester / modified polylactic acid into a web to form a fiber web layer; then reinforcing by hydroentanglement, drying, and rolling to obtain the wear-resistant and environmentally friendly spunlace non-woven fabric.

[0023] Preferably, the carded web is parallel laid or cross laid; the hydroentanglement reinforcement process is: hydroentanglement pressure is 4 to 10 MPa, and the number of hydroentanglement passes is 3 to 6.

[0024] Preferably, the wear-resistant non-woven fabric may also be subjected to surface punching and embossing processes, and the punching and embossing processes are well known to those skilled in the art.

[0025] Polylactic acid has good biocompatibility, degradability and skin affinity, and is a good environmentally friendly material, but it is generally used in non-woven fabrics with low strength and insufficient wear resistance. Maleic anhydride can improve the mechanical strength of terminal carboxyl polylactic acid by melt grafting, but its wear resistance still cannot meet the use requirements of non-woven fabrics. After the terminal carboxyl polylactic acid is grafted with maleic anhydride, the present invention reacts with chitosan, polyether polyamine, and trimesoyl chloride, and uses the amino groups of chitosan and polyether polyamine and the hydroxyl groups in chitosan to carry out N-acylation reaction and O-acylation reaction with the anhydride in maleic anhydride on the graft chain, thereby introducing chitosan with excellent tear resistance and wear resistance into the side chain of polylactic acid; at the same time, since polyether polyamine is multifunctional, a cross-linked network structure can be formed in the side chain. In addition, trimesoyl chloride is a multifunctional small molecule rigid substance, which can react with the hydroxyl groups on chitosan to form local rigid cross-linking points in the entire system, thereby further improving the strength of the system. That is, after the above modification, polylactic acid forms a cross-linked network structure in its side chain structure while keeping the main chain structure of polylactic acid basically unchanged, and the chitosan in the side chain structure is also environmentally friendly, thereby basically maintaining the environmental characteristics of polylactic acid while improving its mechanical strength and wear resistance.

[0026] The parallel structured bicomponent fiber is a composite fiber in which two components are arranged in parallel in the same fiber, and the two components have a continuous and clear interface along the fiber axis. The polylactic acid obtained after the above modification has an improved rigidity and strength in its molecular structure, so that the thermal shrinkage rate of the fiber made from it will decrease; while the high shrinkage polyester fiber (HSPET) has a relatively high shrinkage rate, which makes the thermal shrinkage performance of the two fibers very different. Therefore, when the modified polylactic acid and the high shrinkage polyester are spun in parallel, spiral curling will occur during the spinning process due to different degrees of shrinkage, making the obtained bicomponent fiber fluffy, thereby further giving it softness and skin-friendliness.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention first melts and grafts maleic anhydride onto carboxyl-terminated polylactic acid, and then reacts it with chitosan, polyether polyamine, and trimellitic acid chloride to obtain modified polylactic acid; then the modified polylactic acid and high-shrinkage polyester are compound-spun to obtain a bicomponent fiber with a side-by-side structure; finally, a wear-resistant and environmentally friendly spunlace non-woven fabric is prepared through the processes of web laying and hydroentangling. In the present invention, after modification, polylactic acid forms a cross-linked network structure in its side chain structure while the main chain structure remains basically unchanged, thereby basically maintaining the good biocompatibility, degradability, and skin-friendly property of polylactic acid while improving its mechanical strength and wear resistance; then the modified polylactic acid and high-shrinkage polyester are compound-spun to obtain a bicomponent fiber with a side-by-side structure. Due to the large difference in the thermal shrinkage properties of the two components, spiral crimping occurs during the spinning process due to different degrees of shrinkage, making the prepared bicomponent fiber fluffy, thereby further endowing it with soft skin-friendly property. Detailed Embodiments

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. The following embodiments facilitate a better understanding of the present invention, but do not limit the present invention. The experimental methods in the following embodiments are all conventional methods unless otherwise specified.

[0030] In the embodiments of the present invention, unless otherwise specified, "parts" are all parts by mass, and "%" are all mass percentages unless otherwise specified.

[0031] The carboxyl-terminated polylactic acid is purchased from Ningbo Global Bio Co., Ltd., with an intrinsic viscosity of 1.40 ± 0.02 dl / g and a melting point of 170 ± 2 °C.

[0032] Chitosan is purchased from Jinan Haidebei Marine Bioengineering Co., Ltd., with an intrinsic viscosity of 2.2 ± 0.02 dl / g and a deacetylation degree of 85%.

[0033] The polyether triamine T-403 is purchased from Huntsman, and its molecular weight is about 400.

[0034] The high-shrinkage polyester chips are purchased from Zhejiang Hengyi High-Tech Materials Co., Ltd., with an intrinsic viscosity of 0.68 ± 0.01 dl / g and a melting point of 206 ± 2 °C.

[0035] Preparation of Modified Polylactic Acid

[0036] Preparation Example 1

[0037] (L1) 100 parts of carboxyl-terminated polylactic acid chips and 5 parts of maleic anhydride are respectively dried in a drying oven at 70 °C for 8 hours. After the dried polylactic acid chips, maleic anhydride, and 0.1 part of di-tert-butyl peroxide are mixed evenly, they are melt-grafted at 190 °C in a twin-screw extruder for 1 h, and the screw speed is 80 r / min; the reaction extrudate is cooled by a cooling water tank to obtain grafted polylactic acid chips;

[0038] (L2) Under a nitrogen atmosphere, all of the grafted polylactic acid obtained in step (L1), 6 parts of chitosan, 2 parts of polyether triamine T-403, and 0.03 parts of anhydrous FeCl3 were dissolved in a mixed solution of DMF and oxalic acid (the volume ratio of oxalic acid in the mixed solution was 2%), and the reaction was carried out at 8 °C for 2 h, then the temperature was raised to 70 °C and the reaction was continued for 3 h; after cooling to room temperature, 0.25 parts of trimellitic acid chloride and 0.4 parts of pyridine were added, and the reaction was carried out at 15 °C for 1 h. After the reaction, rotary evaporation, drying to constant weight, and pelletizing were carried out to obtain modified polylactic acid.

[0039] Preparation Example 2

[0040] The rest was the same as Preparation Example 1, except that in step (L2), the amounts of raw materials used were: 6.5 parts of chitosan, 2 parts of polyether triamine T-403, 0.04 parts of anhydrous FeCl3, 0.3 parts of trimellitic acid chloride, and 0.5 parts of pyridine.

[0041] Preparation Example 3

[0042] The rest was the same as Preparation Example 1, except that in step (L2), the amounts of raw materials used were: 7 parts of chitosan, 2.5 parts of polyether triamine T-403, 0.04 parts of anhydrous FeCl3, 0.35 parts of trimellitic acid chloride, and 0.6 parts of pyridine.

[0043] Preparation Example 4

[0044] The rest was the same as Preparation Example 1, except that in step (L2), the amounts of raw materials used were: 7.5 parts of chitosan, 3 parts of polyether triamine T-403, 0.05 parts of anhydrous FeCl3, 0.4 parts of trimellitic acid chloride, and 0.7 parts of pyridine.

[0045] Preparation Example 5

[0046] The rest was the same as Preparation Example 1, except that in step (L1), the amounts of raw materials used were: 100 parts of end-carboxyl polylactic acid pellets, 8 parts of maleic anhydride, and 0.2 parts of di-tert-butyl peroxide; in step (L1), the amounts of raw materials used were: 9.6 parts of chitosan, 3.2 parts of polyether triamine T-403, 0.05 parts of anhydrous FeCl3, 0.4 parts of trimellitic acid chloride, and 0.7 parts of pyridine.

[0047] Comparative Preparation Example 1

[0048] The rest was the same as Preparation Example 1, except that in step (L2), 1-amino-1-deoxy-D-sorbitol of equal mass was used to replace chitosan.

[0049] Comparative Preparation Example 2

[0050] The rest was the same as Preparation Example 1, except that in step (L2), polyether triamine T-403 was not added.

[0051] Comparative Preparation Example 3

[0052] The rest is the same as Preparation Example 1, except that step (L2) is cancelled.

[0053] Example 1

[0054] 1) The modified polylactic acid and the high-shrinkage polyester chips are respectively dried in a rotary drum drying oven at 75°C for 12 h; 40 parts of the modified polylactic acid prepared in Preparation Example 1 after drying are added to a twin-screw extruder for heating and melting (the feeding section temperature of the twin-screw extruder is 180°C, the compression section temperature is 200°C, and the metering section temperature is 215°C), and then enter the spinning die head through a melt filter, a melt conveying pipeline, and a metering pump, and are evenly distributed to the first spinning assembly through the spinning die head (temperature 235°C); 60 parts of the dried high-shrinkage polyester are added to another twin-screw extruder for heating and melting (the feeding section temperature of the twin-screw extruder is 200°C, the compression section temperature is 215°C, and the metering section temperature is 225°C), and then enter the spinning die head (temperature 235°C) through a melt filter, a melt conveying pipeline, and a metering pump, and are evenly distributed to the second spinning assembly through the spinning die head; composite spinning is carried out at the outlet, and after cooling, stretching, winding, and cutting, bicomponent fibers with a high-shrinkage polyester / modified polylactic acid side-by-side structure with a fineness of 2.2 dtex and a length of 35 mm are made;

[0055] 2) The bicomponent fibers with the side-by-side structure prepared above are loosened, fed into a carding machine, and cross-laid to form a fiber web layer with a grammage of 25 g / m 2 ; then it is sent into the hydroentangling high-pressure jet area for hydroentangling reinforcement at 8 Mpa, the number of hydroentangling passes is 5, and then dried and wound at 120°C to obtain wear-resistant and environmentally friendly hydroentangled non-woven fabric.

[0056] Examples 2-5

[0057] The rest is the same as Example 1, except that in step 1), the modified polylactic acid is prepared in Preparation Examples 2-5.

[0058] In Example 6, the modified polylactic acid in the bicomponent fiber accounts for 50%

[0059] The rest is the same as Example 1, except that in step 1), 50 parts of the modified polylactic acid prepared in Preparation Example 1 after drying and 50 parts of the dried high-shrinkage polyester are used.

[0060] Comparative Examples 1-3

[0061] The rest is the same as Example 1, except that in step 1), the modified polylactic acid is prepared in Comparative Preparation Examples 1-3 respectively.

[0062] Testing and Analysis

[0063] The spunlace nonwovens prepared in the above-mentioned examples and comparative examples were subjected to the following performance tests:

[0064] Abrasion resistance: The test was carried out in accordance with the provisions of GB / T 21196.2-2007 "Textiles - Determination of the abrasion resistance of fabrics by the Martindale method - Part 2: Determination of specimen damage". The test conditions were: friction load of 3 kPa, standard wool felt; record the total number of frictions when the specimen is damaged, and determine its abrasion resistance. The higher the total number of frictions at the time of damage, the better the abrasion resistance.

[0065] Softness: The transverse softness and longitudinal softness were determined with reference to the test method of Standard GB / T 8942-2016. The larger the value, the worse the softness.

[0066] Degradability test: The test was carried out in accordance with the provisions of GB / T 19277.1-2011 "Determination of the ultimate aerobic biodegradability of materials under controlled composting conditions - Method by measuring the evolved carbon dioxide - Part 1: General method".

[0067] The test results are shown in Table 1.

[0068] Table 1 Performance test

[0069]

[0070]

[0071] As can be seen from Table 1, the spunlace nonwovens prepared in the examples of the present invention have excellent abrasion resistance and good biodegradability, and are skin-friendly and soft, that is, they take into account both abrasion resistance and environmental protection. The nonwovens prepared in Comparative Example 1 have insufficient abrasion resistance and degradation environmental protection. Although the nonwovens prepared in Comparative Example 2 have good degradability and skin-friendliness, their abrasion resistance is insufficient. Although the nonwovens prepared in Comparative Example 3 have excellent degradability and skin-friendliness, their abrasion resistance is poor.

[0072] The above detailed description is a specific description of one of the feasible embodiments of the present invention. This embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification without departing from the present invention shall be included within the scope of the technical solution of the present invention.

Claims

1. A wear-resistant and environmentally friendly spunlace nonwoven fabric, characterized in that: The invention is composed of a bicomponent fiber of a high shrinkage polyester / modified polylactic acid parallel structure. The modified polylactic acid is prepared by melt grafting maleic anhydride to carboxyl-terminated polylactic acid and then reacting with chitosan, polyether polyamine and trimesoyl chloride. The amount of maleic anhydride used is 5-8wt% of the carboxyl-terminated polylactic acid. The mass ratio of maleic anhydride, chitosan, polyether polyamine and trimesoyl chloride is 1:(1.2-1.5):(0.4-0.6):(0.05-0.08).

2. The wear-resistant and environmentally friendly spunlace nonwoven fabric according to claim 1, characterized in that: The mass ratio of maleic anhydride, chitosan, polyether polyamine and trimesoyl chloride is 1:(1.3-1.4):(0.4-0.5):(0.06-0.07).

3. The wear-resistant and environmentally friendly spunlace nonwoven fabric according to claim 1, characterized in that: The modified polylactic acid is prepared by a preparation method comprising the following steps: (L1) melt-grafting carboxyl-terminated polylactic acid, maleic anhydride and an initiator to obtain grafted polylactic acid; (L2) The grafted polylactic acid, chitosan, polyether polyamine and catalyst are dissolved in a solvent, reacted at 5-10°C for 2-4 hours under an inert atmosphere, and then heated to 60-80°C to continue the reaction for 2-4 hours; then trimesoyl chloride and an acid binding agent are added, reacted at 10-25°C for 0.5-1 hour, and after the reaction is completed, the modified polylactic acid is obtained by rotary evaporation and drying.

4. The wear-resistant and environmentally friendly spunlace nonwoven fabric according to claim 3, characterized in that: In step (L1), the initiator is selected from at least one of dicumyl peroxide and di-tert-butyl peroxide, and the amount of the initiator is 0.1-0.2wt% of the carboxyl-terminated polylactic acid; the melt grafting is carried out in a twin-screw extruder at a reaction temperature of 180-200°C for a time of 0.5-1.5h; and / or In step (L2), the catalyst is at least one of FeCl3 and AlCl3, and the amount of the catalyst is 0.5-0.8wt% of chitosan; the solvent is a mixed solution of a polar aprotic organic solvent and an organic acid, wherein the volume proportion of the organic acid is 1-3%, the polar aprotic organic solvent is at least one of N,N-dimethylacetamide, N,N-dimethylformamide, and N-methylpyrrolidone, and the organic acid is at least one of acetic acid, oxalic acid, and citric acid; the inert atmosphere is nitrogen and / or argon; the acid binding agent is selected from at least one of triethylamine and pyridine, and the mass of the acid binding agent is 1.5-2.0 times that of trimesoyl chloride.

5. The wear-resistant and environmentally friendly spunlace nonwoven fabric according to claim 1, characterized in that: In the bi-component fiber of the parallel structure, the mass proportion of modified polylactic acid is 40-50%, and the rest is high shrinkage polyester.

6. The wear-resistant and environmentally friendly spunlace nonwoven fabric according to claim 1, characterized in that: The bicomponent fiber with a parallel structure has a fineness of 1.5 to 3.0 dtex and a length of 30 to 50 mm. The bicomponent fiber with a parallel structure is prepared by a preparation method comprising the following steps: adding modified polylactic acid to an extruder for heating and melting, entering a spinning die through a melt filter, a melt delivery pipeline, and a metering pump, and being evenly distributed to a first spinning assembly through the spinning die; adding high shrinkage polyester to another extruder for heating and melting, entering a spinning die through a melt filter, a melt delivery pipeline, and a metering pump, and being evenly distributed to a second spinning assembly through the spinning die; performing composite spinning at the outlet, and performing cooling, stretching, winding, and cutting to prepare the bicomponent fiber with a parallel structure.

7. The wear-resistant and environmentally friendly spunlace nonwoven fabric according to claim 6, characterized in that: The high shrinkage polyester and modified polylactic acid are dried at 65-80°C for 8-12 hours before being added into the extruder, and the temperature of composite spinning is 230-250°C.

8. The wear-resistant and environmentally friendly spunlace nonwoven fabric according to claim 1, characterized in that: The intrinsic viscosity of the high shrinkage polyester is 0.65-0.72 dl / g, and the melting point is 200-220°C; the intrinsic viscosity of the carboxyl-terminated polylactic acid is 1.30-1.50 dl / g, and the melting point is 160-190°C; the intrinsic viscosity of the chitosan is 2.0-2.5 dl / g, and the degree of deacetylation is 80-90%; the polyether polyamine is at least one of polyether diamine and polyether triamine, and the number average molecular weight of the polyether polyamine is 400-1000.

9. The method for preparing the wear-resistant and environmentally friendly spunlace nonwoven fabric according to any one of claims 1 to 8, characterized in that: The following steps are involved: The bi-component fibers of the parallel structure of high shrinkage polyester / modified polylactic acid are opened and combed into a web to form a fiber web layer; then, the fibers are reinforced by hydroentanglement, dried, and rolled to obtain a wear-resistant and environmentally friendly hydroentangled nonwoven fabric.

10. The preparation method according to claim 9, characterized in that: The carding web is parallel-laid or cross-laid; the hydroentanglement reinforcement process is: hydroentanglement pressure is 4-10Mpa, and the number of hydroentanglement passes is 3-6.

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