A preparation process of masterbatch for hydrophilic high-strength polypropylene non-woven fabric

Abstract

The invention relates to the technical field of polypropylene, and discloses a preparation process of a masterbatch for hydrophilic high-strength polypropylene non-woven fabrics. Polypropylene resin, hyperbranched polyurethane elastomer, and antioxidant are melt-blended and extruded, and granulated to obtain a masterbatch for hydrophilic high-strength polypropylene non-woven fabrics. The invention uses polyoxypropylene glycol as a polyol monomer, dicarboxyl sulfonate betaine polyol monomer as a branching chain extension monomer, and isophorone diisocyanate and other monomers for polymerization reaction to obtain a hyperbranched polyurethane elastomer. It has good compatibility with polypropylene resin, and can be used as a toughening agent to significantly improve the breaking strength and elongation at break of polypropylene non-woven fabrics. The hyperbranched polyurethane elastomer uses dicarboxyl sulfonate betaine polyol monomer as a branching chain extension monomer, which improves the hydrophilicity of the elastomer, is conducive to reducing the water contact angle of the non-woven fabric, and improves the surface hydrophilicity.

Description

Technical Field

[0001] The invention relates to the technical field of polypropylene, in particular to a preparation process of a masterbatch for hydrophilic high-strength polypropylene non-woven fabric. Background Art

[0002] Polypropylene non-woven fabrics have good air permeability, are non-toxic and non-irritating, and have a simple production process. They are widely used in sanitary protection products, packaging bags, household items, etc. Traditional polypropylene non-woven fabrics have poor tensile fracture performance and poor hydrophilicity, resulting in poor hand feel and skin-friendly effects of polypropylene non-woven fabrics, which limits the practical application of polypropylene non-woven fabrics. Functional masterbatches mainly include toughening masterbatches, color masterbatches, etc. They are a common processing aid and are widely used in the processing of non-woven fabrics, plastics and other materials.

[0003] Polyurethane elastomers have excellent toughness and elasticity, good mechanical properties, and can improve the toughness, strength and other mechanical properties of materials such as polypropylene and polyvinyl chloride. Chinese patent CN103522447B A method for preparing a halogen-free composite flame-retardant polypropylene / thermoplastic polyurethane elastomer composite material uses polypropylene, thermoplastic polyurethane elastomer, polypropylene grafted maleic anhydride, red phosphorus flame retardant masterbatch, etc. as raw materials. The obtained polypropylene masterbatch has good flame retardancy and comprehensive mechanical properties. However, this patent does not improve the hydrophilicity of polypropylene and non-woven materials, and compared with linear polyurethane elastomers, hyperbranched polyurethane elastomers have better mechanical properties such as toughness. It has a better toughening effect on materials such as polypropylene. Summary of the invention

[0004] The invention solves the problems of poor hydrophilicity and low strength of the polypropylene non-woven fabric.

[0005] The technical solution adopted by the present invention is: a preparation process of masterbatch for hydrophilic high-strength polypropylene non-woven fabric:

[0006] S1. Add dried and dehydrated polyoxypropylene glycol and diisocyanate monomer into a flask, introduce nitrogen to carry out a prepolymerization reaction, then add dicarboxyl sulfobetaine polyol monomer and dibutyltin dilaurate, vacuum degassing, pour into a mold, and heat cure to obtain a hyperbranched polyurethane elastomer.

[0007] The structural formula of dicarboxylic acid betaine polyol monomer is shown in formula (1):

[0008] Formula (1);

[0009] S2. Put the polypropylene resin, the hyperbranched polyurethane elastomer and the antioxidant in a twin-screw extruder, melt-blend and extrude, and granulate to obtain a masterbatch for hydrophilic high-strength polypropylene non-woven fabric.

[0010] Further, in S1, the prepolymerization reaction is carried out at a temperature of 65-75°C for 2-3 hours. The thermal curing is first carried out at 60-80°C for 1-2 hours, and then at 100-110°C for 6-10 hours.

[0011] Furthermore, in S1, the molar amounts of polyoxypropylene glycol and dicarboxyl sulfobetaine polyol monomers are 37-42% and 64-70% of the molar amount of the diisocyanate monomer, respectively.

[0012] Furthermore, the diisocyanate monomer is toluene-2,4-diisocyanate, isophorone diisocyanate or diphenylmethane-4,4'-diisocyanate.

[0013] Furthermore, in S2, the mass of the hyperbranched polyurethane elastomer is 20-50% of the mass of the polypropylene resin.

[0014] Furthermore, in S2, the temperature of each section in the twin-screw extruder is 175-200°C, and the screw speed is 200-400r / min.

[0015] Further, the preparation process of dicarboxylic acid betaine polyol monomer is:

[0016] Step (1), add ethylenediamine-N,N'-diacetic acid dimethyl ester, glycidol (240-300% of the molar amount of ethylenediamine-N,N'-diacetic acid dimethyl ester), and ethanol solvent into a flask, place the flask in a microwave reactor, set the microwave power to 500-800W, react for 5-10 minutes, remove low boiling points by distillation under reduced pressure, and dry to obtain an intermediate.

[0017] Step (2), adding the intermediate, 200-240% of the molar amount of the intermediate sodium 2-bromoethane sulfonate, and N,N-dimethylformamide solvent to a flask, stirring and reacting at a temperature of 70-110° C. for 36-60 hours, removing low boiling points by distillation under reduced pressure, washing with petroleum ether, adding the product to methanol, then adding sodium hydroxide and water, condensing and refluxing at 80-90° C. for hydrolysis reaction for 4-6 hours, adding hydrochloric acid solution for acidification, controlling the pH of the reaction solution to 3, precipitating a precipitate, filtering, and recrystallizing the product with ethanol to obtain a dicarboxy sulfonic acid betaine polyol monomer.

[0018] Technical effect: The present invention subjects ethylenediamine-N,N'-diacetic acid dimethyl ester and glycidol to microwave irradiation reaction, and then subjects them to quaternization reaction with sodium 2-bromoethane sulfonate, and finally hydrolyzes them to obtain a novel dicarboxyl sulfonate betaine polyol monomer containing four hydroxyl groups, two carboxyl groups and two sulfonate betaine groups.

[0019] The invention uses polyoxypropylene glycol as a polyol monomer, dicarboxyl sulfonate betaine polyol monomer as a branched chain extension monomer, and isophorone diisocyanate and other monomers to carry out polymerization reaction to obtain a hyperbranched polyurethane elastomer. Polyoxypropylene glycol has certain similarities with the molecular chain structural unit of polypropylene, so that the hyperbranched polyurethane elastomer has good compatibility with polypropylene resin, and the hyperbranched polyurethane elastomer with excellent performance can be used as a toughening agent. When the polypropylene non-woven fabric is subjected to stress, the hyperbranched soft segment of the hyperbranched polyurethane elastomer can absorb the impact energy, and the hyperbranched hard segment can transmit and buffer the stress, thereby achieving a good toughening effect and significantly improving the breaking strength and elongation at break of the polypropylene non-woven fabric.

[0020] The hyperbranched polyurethane elastomer of the invention uses dicarboxyl sulfonate betaine polyol monomers as branched chain extension monomers, introduces a large number of carboxyl groups and sulfonate betaine hydrophilic groups into the elastomer molecular chain, improves the hydrophilicity of the elastomer, and adds the masterbatch containing the hydrophilic elastomer into the polypropylene non-woven fabric, which is beneficial to reducing the water contact angle of the non-woven fabric and improving the surface hydrophilicity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the reaction formula for preparing dicarboxylic acid betaine polyol monomer. DETAILED DESCRIPTION

[0022] The present application is further described in detail below in conjunction with the examples. It is particularly noted that if no specific conditions are specified in the following examples, the experiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following examples can be obtained from common commercial sources.

[0023] The polypropylene resin of the present invention is HL504FB.

[0024] Preparation process of ethylenediamine-N,N'-diacetic acid dimethyl ester: add 150mL methanol and 28.4mmol ethylenediamine-N,N'-diacetic acid (structural formula: ), heated to 45°C, added 113.6mmol thionyl chloride dropwise, reacted for 20h, removed low-boiling substances by vacuum distillation, and dried to obtain ethylenediamine-N,N'-diacetic acid dimethyl ester. The structural formula is .

[0025] Example 1

[0026] (1) Add 15 mmol of ethylenediamine-N,N'-diacetic acid dimethyl ester, 36 mmol of glycidol, and 20 mL of ethanol solvent into a flask, place the flask in a microwave reactor, set the microwave power to 800 W, react for 8 min, remove low-boiling substances by vacuum distillation, and dry to obtain an intermediate.

[0027] (2) Add 20 mmol of the intermediate, 48 mmol of sodium 2-bromoethane sulfonate, and 100 mL of N,N-dimethylformamide solvent to a flask, stir and react at 100°C for 48 hours, remove low-boiling substances by distillation under reduced pressure, wash with petroleum ether, add the product to 40 mL of methanol, then add 180 mmol of sodium hydroxide and 60 mL of water, condense and reflux for hydrolysis at 80°C for 6 hours, add hydrochloric acid solution for acidification, control the pH of the reaction solution to 3, precipitate, filter, and recrystallize the product with ethanol to obtain a dicarboxysulfonic acid betaine polyol monomer.

[0028] (3) Add 18.5 mmol of dried and dehydrated polyoxypropylene glycol and 50 mmol of isophorone diisocyanate into a flask, introduce nitrogen, and carry out a prepolymerization reaction at 75°C for 2 h. Then, add 35 mmol of dicarboxysulfobetaine polyol monomer and 0.15 g of dibutyltin dilaurate, degas in a vacuum, pour into a mold, heat cure at 60°C for 2 h, and then heat cure at 110°C for 6 h. After cooling, place at room temperature for 7 days to obtain a hyperbranched polyurethane elastomer.

[0029] (4) 100 g of polypropylene resin, 20 g of hyperbranched polyurethane elastomer, and 0.8 g of antioxidant are placed in a twin-screw extruder, and the temperatures of sections 1 to 6 are 175°C, 190°C, 195°C, 200°C, 200°C, and 195°C; the screw speed is 200 r / min, and melt-blending and extrusion are performed, and granulation is performed to obtain a masterbatch for hydrophilic high-strength polypropylene non-woven fabric.

[0030] Example 2

[0031] (1) Add 15 mmol of ethylenediamine-N,N'-diacetic acid dimethyl ester, 45 mmol of glycidol, and 30 mL of ethanol solvent into a flask, place the flask in a microwave reactor, set the microwave power to 800 W, react for 5 min, remove low-boiling substances by vacuum distillation, and dry to obtain an intermediate.

[0032] (2) Add 20 mmol of the intermediate, 40 mmol of sodium 2-bromoethane sulfonate, and 80 mL of N,N-dimethylformamide solvent to a flask, stir and react at a temperature of 110°C for 36 hours, remove low-boiling substances by distillation under reduced pressure, wash with petroleum ether, add the product to 30 mL of methanol, then add 180 mmol of sodium hydroxide and 60 mL of water, condense and reflux for hydrolysis at 80°C for 6 hours, add hydrochloric acid solution for acidification, control the pH of the reaction solution to 3, precipitate, filter, and recrystallize the product with ethanol to obtain a dicarboxysulfonic acid betaine polyol monomer.

[0033] (3) Add 21 mmol of dried and dehydrated polyoxypropylene glycol and 50 mmol of diphenylmethane-4,4'-diisocyanate into a flask, introduce nitrogen, and carry out a prepolymerization reaction at 65°C for 3 hours. Then, add 33 mmol of dicarboxyl sulfonic acid betaine polyol monomer and 0.13 g of dibutyltin dilaurate, degas in vacuum, pour into a mold, heat cure at 80°C for 1 hour, and then heat cure at 110°C for 6 hours. After cooling, place at room temperature for 7 days to obtain a hyperbranched polyurethane elastomer.

[0034] (4) 100 g of polypropylene resin, 35 g of hyperbranched polyurethane elastomer, and 0.5 g of antioxidant were placed in a twin-screw extruder, and the temperatures of sections 1 to 6 were 175°C, 190°C, 195°C, 200°C, 200°C, and 195°C; the screw speed was 400 r / min, and melt-blending and extruding were performed, and granulation was performed to obtain a masterbatch for hydrophilic high-strength polypropylene non-woven fabric.

[0035] Example 3

[0036] (1) Add 15 mmol of ethylenediamine-N,N'-diacetic acid dimethyl ester, 39 mmol of glycidol, and 20 mL of ethanol solvent into a flask, place the flask in a microwave reactor, set the microwave power to 500 W, react for 10 min, remove low-boiling substances by vacuum distillation, and dry to obtain an intermediate.

[0037] (2) Add 20 mmol of the intermediate, 48 mmol of sodium 2-bromoethane sulfonate, and 100 mL of N,N-dimethylformamide solvent to a flask, stir and react at 70°C for 60 h, remove low-boiling substances by distillation under reduced pressure, wash with petroleum ether, add the product to 40 mL of methanol, then add 200 mmol of sodium hydroxide and 70 mL of water, condense and reflux for hydrolysis at 90°C for 4 h, add hydrochloric acid solution for acidification, control the pH of the reaction solution to 3, precipitate, filter, and recrystallize the product with ethanol to obtain a dicarboxysulfonic acid betaine polyol monomer.

[0038] (3) Add 21 mmol of dried and dehydrated polyoxypropylene glycol and 50 mmol of toluene-2,4-diisocyanate into a flask, introduce nitrogen, and carry out a prepolymerization reaction at 65°C for 3 hours. Then, add 32 mmol of dicarboxyl sulfonic acid betaine polyol monomer and 0.15 g of dibutyltin dilaurate, degas in a vacuum, pour into a mold, first heat cure at 70°C for 2 hours, then heat cure at 100°C for 10 hours, cool and place at room temperature for 7 days to obtain a hyperbranched polyurethane elastomer.

[0039] (4) 100 g of polypropylene resin, 50 g of hyperbranched polyurethane elastomer, and 0.5 g of antioxidant were placed in a twin-screw extruder, and the temperatures of sections 1 to 6 were 175°C, 190°C, 195°C, 200°C, 200°C, and 195°C; the screw speed was 200 r / min, and melt-blending and extruding were performed, and granulation was performed to obtain a masterbatch for hydrophilic high-strength polypropylene non-woven fabric.

[0040] Comparative Example 1

[0041] 100g of polypropylene resin and 0.8g of antioxidant are placed in a twin-screw extruder, and the temperatures of sections 1 to 6 are 175°C, 190°C, 195°C, 200°C, 200°C, and 195°C; the screw speed is 200r / min, and melt-blending and extrusion are performed, and granulation is performed to obtain masterbatch for polypropylene non-woven fabric.

[0042] Comparative Example 2

[0043] (1) According to the process of Example 1, an intermediate having the structural formula .

[0044] (2) Add 18.5 mmol of dried and dehydrated polyoxypropylene glycol and 50 mmol of isophorone diisocyanate into a flask, introduce nitrogen, and carry out a prepolymerization reaction at 75°C for 2 hours. Then, add 35 mmol of the intermediate and 0.15 g of dibutyltin dilaurate, degas in a vacuum, pour into a mold, heat cure at 60°C for 2 hours, and then heat cure at 110°C for 6 hours. After cooling, place at room temperature for 7 days to obtain a hyperbranched polyurethane elastomer.

[0045] (3) 100 g of polypropylene resin, 20 g of hyperbranched polyurethane elastomer, and 0.8 g of antioxidant were placed in a twin-screw extruder, and the temperatures of sections 1 to 6 were 175°C, 190°C, 195°C, 200°C, 200°C, and 195°C; the screw speed was 200 r / min, and the mixture was melt-blended and extruded, and granulated to obtain a masterbatch for polypropylene non-woven fabric.

[0046] Comparative Example 3

[0047] (1) Add 18.5 mmol of dried and dehydrated polyoxypropylene glycol and 50 mmol of isophorone diisocyanate into a flask, introduce nitrogen, and carry out a prepolymerization reaction at 75°C for 2 hours. Then, add 35 mmol of 2,2-dihydroxymethylpropionic acid and 0.15 g of dibutyltin dilaurate, degas in vacuum, pour into a mold, heat cure at 60°C for 2 hours, and then heat cure at 110°C for 6 hours. After cooling, place at room temperature for 7 days to obtain a polyurethane elastomer.

[0048] (2) 100 g of polypropylene resin, 20 g of hyperbranched polyurethane elastomer, and 0.8 g of antioxidant are placed in a twin-screw extruder, and the temperatures of sections 1 to 6 are 175°C, 190°C, 195°C, 200°C, 200°C, and 195°C; the screw speed is 200 r / min, and the melt-blending and extrusion are performed, and granulation is performed to obtain a masterbatch for polypropylene non-woven fabric.

[0049] Comparative Example 4

[0050] (1) Add 18.5 mmol of dried and dehydrated polyoxypropylene glycol and 50 mmol of isophorone diisocyanate into a flask, introduce nitrogen, and carry out prepolymerization at 75°C for 2 h. Then, add 35 mmol of pentaerythritol and 0.15 g of dibutyltin dilaurate, degas in vacuum, pour into a mold, heat cure at 60°C for 2 h, then heat cure at 110°C for 6 h, cool and place at room temperature for 7 days to obtain a hyperbranched polyurethane elastomer.

[0051] (2) 100 g of polypropylene resin, 20 g of hyperbranched polyurethane elastomer, and 0.8 g of antioxidant are placed in a twin-screw extruder, and the temperatures of sections 1 to 6 are 175°C, 190°C, 195°C, 200°C, 200°C, and 195°C; the screw speed is 200 r / min, and the melt-blending and extrusion are performed, and granulation is performed to obtain a masterbatch for polypropylene non-woven fabric.

[0052] The antibacterial polypropylene non-woven fabric masterbatch (150g) prepared in each embodiment and comparative example was mixed with 1kg polypropylene resin in a mixer, and then extruded and granulated in a twin-screw extruder. The temperature of sections 1-6 was 150°C, 165°C, 175°C, 185°C, 185°C, and 185°C, and the screw speed was 250r / min. After extrusion, granulation was performed, and finally, a non-woven fabric was made through a melt-blown cloth equipment through melt-blowing, drawing, cooling and shaping, hot air traction, and receiving processes. The melt-blown process parameters of the melt-blown cloth equipment are that the temperature of zones 1-4 is 175°C, 215°C, 225°C, 230°C, the temperature of the die zone is 230°C, the temperature of the metering pump zone is 235°C, and the temperature of the nozzle zone is 230°C. The hot air traction temperature is 250°C. The receiving distance is 40cm. Polypropylene non-woven fabric is obtained.

[0053] A nonwoven fabric made of polypropylene resin without adding antibacterial polypropylene nonwoven fabric masterbatch was used as a blank control sample.

[0054] The breaking properties of nonwoven fabrics were tested according to the method of FZ / T60005-1991.

[0055] The surface water contact angle of non-woven fabrics was tested according to the method of GB / T 42694-2023.

[0056] Table 1 Nonwoven fabric breaking properties and water contact angle test

[0057]

[0058] After testing, the blank control sample of polypropylene non-woven fabric without adding masterbatch had transverse and longitudinal breaking strengths of 82.0 N and 126.2 N, transverse and longitudinal breaking elongations of 49.9% and 63.7%, and a water contact angle of 138.3°.

[0059] The masterbatch of Comparative Example 1 contains only polypropylene and antioxidant, but no hyperbranched polyurethane elastomer, and its breaking strength, breaking elongation, and water contact angle are slightly different from those of the blank control sample.

[0060] The hyperbranched polyurethane elastomer added in the masterbatch of Examples 1-3 is based on polyoxypropylene glycol as a polyol monomer, and the molecular chain structural unit of polyoxypropylene glycol and polypropylene has certain similarities, so that the hyperbranched polyurethane elastomer has good compatibility with polypropylene resin, and the hyperbranched polyurethane elastomer with excellent performance can be used as a toughening agent. When the polypropylene non-woven fabric is subjected to stress, the hyperbranched soft segment of the hyperbranched polyurethane elastomer can absorb the impact energy, and the hyperbranched hard segment can transmit and buffer the stress, thereby playing a good toughening effect, significantly improving the breaking strength and elongation at break of the polypropylene non-woven fabric, which is significantly higher than that of Comparative Example 1 and the blank control sample. And the hyperbranched polyurethane elastomer uses dicarboxyl sulfonate betaine polyol monomer as a branched chain extension monomer, introduces a large amount of carboxyl and sulfonate betaine hydrophilic groups into the elastomer molecular chain, improves the hydrophilicity of the elastomer, and adds the masterbatch containing the hydrophilic elastomer to the polypropylene non-woven fabric, which is conducive to reducing the water contact angle of the non-woven fabric and improving the surface hydrophilicity.

[0061] Compared with Example 1, the polyurethane elastomer added to the masterbatch of Comparative Example 2 uses an intermediate containing multiple hydroxyl groups as a branched chain extension monomer. The obtained polyurethane elastomer also has a hyperbranched structure, and has a significant effect on improving the breaking strength and elongation at break of the polypropylene non-woven fabric, which is not much different from Example 1. However, the intermediate does not contain carboxyl and sulfonated betaine hydrophilic groups, resulting in poor hydrophilicity of the polyurethane elastomer, and cannot effectively reduce the water contact angle of the polypropylene non-woven fabric, resulting in poor surface hydrophilicity of the non-woven fabric.

[0062] Compared with Example 1, the polyurethane elastomer of Comparative Example 3 uses 2,2-dihydroxypropionic acid as a chain extension monomer, which contains only two hydroxyl groups and cannot undergo hyperbranched polymerization. The generated polyurethane elastomer has a linear structure and has a poor toughening effect on the polypropylene non-woven fabric. Its breaking strength and breaking elongation are higher than those of Comparative Example 1, but significantly lower than those of Example 1. In addition, 2,2-dihydroxypropionic acid contains only one carboxyl group and does not contain a sulfonic acid betaine hydrophilic group, resulting in a lower hydrophilicity of the polyurethane elastomer than that of Example 1, and the water contact angle of the polypropylene non-woven fabric is significantly greater than that of Example 1, indicating poor hydrophilicity.

[0063] Comparative Example 4 uses pentaerythritol as a branched chain extension monomer. The obtained polyurethane elastomer also has a hyperbranched structure, and has a significant effect on improving the breaking strength and breaking elongation of the polypropylene non-woven fabric. However, pentaerythritol does not contain carboxyl and sulfobetaine hydrophilic groups, resulting in poor hydrophilicity of the polyurethane elastomer, and cannot effectively reduce the water contact angle of the polypropylene non-woven fabric, resulting in poor surface hydrophilicity of the non-woven fabric.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for preparing a masterbatch for hydrophilic high-strength polypropylene non-woven fabric, characterized in that: The preparation process is: S1, add dried and dehydrated polyoxypropylene glycol and diisocyanate monomer into a flask, introduce nitrogen to carry out prepolymerization reaction, then add dicarboxyl sulfobetaine polyol monomer and dibutyltin dilaurate, vacuum degassing, pour into a mold, and heat cure to obtain a hyperbranched polyurethane elastomer; The dicarboxylic acid betaine polyol monomer structural formula is shown in formula (1): Formula (1); S2. Put the polypropylene resin, the hyperbranched polyurethane elastomer and the antioxidant in a twin-screw extruder, melt-blend and extrude, and granulate to obtain a masterbatch for hydrophilic high-strength polypropylene non-woven fabric.

2. The process for preparing the masterbatch for hydrophilic high-strength polypropylene non-woven fabric according to claim 1, characterized in that: In S1, the prepolymerization reaction is carried out at a temperature of 65-75° C. for 2-3 hours; the thermal curing is first carried out at 60-80° C. for 1-2 hours, and then at 100-110° C. for 6-10 hours.

3. The process for preparing the masterbatch for hydrophilic high-strength polypropylene non-woven fabric according to claim 1, characterized in that: In the S1, the molar amounts of polyoxypropylene glycol and dicarboxyl sulfobetaine polyol monomers are 37-42% and 64-70% of the molar amount of the diisocyanate monomer, respectively.

4. The process for preparing the masterbatch for hydrophilic high-strength polypropylene non-woven fabric according to claim 3, characterized in that: The diisocyanate monomer is toluene-2,4-diisocyanate, isophorone diisocyanate or diphenylmethane-4,4'-diisocyanate.

5. The process for preparing the masterbatch for hydrophilic high-strength polypropylene non-woven fabric according to claim 1, characterized in that: In S2, the mass of the hyperbranched polyurethane elastomer is 20-50% of the mass of the polypropylene resin.

6. The process for preparing the masterbatch for hydrophilic high-strength polypropylene non-woven fabric according to claim 3, characterized in that: The preparation process of the dicarboxylic acid sulfobetaine polyol monomer is as follows: Step (1), adding ethylenediamine-N,N'-diacetic acid dimethyl ester, glycidol and ethanol solvent into a flask, placing the flask in a microwave reactor, reacting, removing low boiling points by distillation under reduced pressure, and drying to obtain an intermediate; Step (2), adding the intermediate, sodium 2-bromoethane sulfonate and N,N-dimethylformamide solvent into a flask, stirring and reacting at a temperature of 70-110° C. for 36-60 hours, removing low boiling points by distillation under reduced pressure, washing with petroleum ether, adding the product into methanol, then adding sodium hydroxide and water, condensing and refluxing at 80-90° C. for hydrolysis reaction for 4-6 hours, adding hydrochloric acid solution for acidification, precipitating a precipitate, filtering, and recrystallizing to obtain a dicarboxy sulfonic acid betaine polyol monomer.

7. The process for preparing the masterbatch for hydrophilic high-strength polypropylene non-woven fabric according to claim 6, characterized in that: In the step (1), the molar amount of glycidol is 240-300% of the molar amount of ethylenediamine-N,N'-diacetate.

8. The process for preparing the masterbatch for hydrophilic high-strength polypropylene non-woven fabric according to claim 6, characterized in that: In the step (1), the microwave power during the reaction is 500-800 W and the reaction time is 5-10 min.

9. The process for preparing the masterbatch for hydrophilic high-strength polypropylene non-woven fabric according to claim 6, characterized in that: In the step (2), the molar amount of sodium 2-bromoethane sulfonate is 200-240% of the molar amount of the intermediate.

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