A kind of polyurethane-polyurea aqueous dispersion and its preparation method and application

Abstract

The present invention provides a highly elastic polyurethane-polyurea aqueous dispersion and a preparation method and application thereof, wherein the polyurethane-polyurea aqueous dispersion comprises a combination of chain extenders such as polyether polyol, polyester polyol and triazole. The soft elastic product prepared based on the polyurethane-polyurea aqueous dispersion provided by the present invention has elasticity and chemical resistance comparable to latex gloves.

Description

Technical Field

[0001] The present invention relates to the technical field of soft elastic products (such as gloves, condoms, etc.), and in particular to a polyurethane-polyurea aqueous dispersion that is beneficial for obtaining high-performance soft elastic products, and a preparation method and application thereof. Background Art

[0002] Soft elastic products such as disposable gloves are widely used in medical gloves, examination gloves, household and industrial fields. At present, the materials used to prepare soft elastic products (such as disposable gloves, condoms, etc.) on the market mainly include natural latex, chloroprene rubber, nitrile rubber, PVC, etc. Among them, natural latex gloves have excellent elasticity, wearability and fit, and have outstanding performance in resistance to disinfectant alcohol, which makes latex gloves widely used in the field of nucleic acid detection. Of course, the disadvantages of latex gloves are also obvious, that is, hand sweat is not easy to evaporate after wearing for a long time, and the comfort level decreases. It is well known that polyurethane dispersions are superior to latex gloves in terms of air permeability and moisture permeability due to the presence of hydrophilic groups, but their strong intermolecular forces lead to their higher strength while reducing their resilience and resistance to polar solvents such as disinfectant alcohol. Especially compared with latex, the disadvantages are more obvious. Therefore, improving their resilience and resistance to disinfectant alcohol is the key to determining whether polyurethane dispersions can enter the application field of latex gloves.

[0003] Patent document CN104725590B discloses a low modulus polyurethane dispersion for disposable gloves, which uses polytetramethylene glycol, polypropylene glycol and toluene diisocyanate as raw materials, and the prepared gloves have properties similar to those of rubber products. However, using toluene diisocyanate, an isocyanate with an asymmetric structure and a benzene ring structure, it is impossible to obtain a resin with good elasticity.

[0004] Patent document CN108864394A discloses a method of preparing gloves for medical use by compounding adipic acid series sulfonate polyester and polypropylene glycol with an additional curing agent, claiming to have excellent alcohol resistance.

[0005] Since polyester does not contain heterocyclic structures and the hydrogen bonding force in the polyurethane structure is strong, good resilience cannot be obtained. In addition, the method of adding an external curing agent will further reduce the resilience, and the addition of the curing agent affects the resin open period, which is not suitable for large-scale production of gloves and other products. Summary of the invention

[0006] The invention provides a single-component polyurethane-polyurea aqueous dispersion. A soft elastic product prepared based on the polyurethane-polyurea aqueous dispersion has appropriate mechanical strength and excellent elongation, especially excellent resistance to disinfectant alcohol, and various properties are comparable to those of latex gloves.

[0007] To achieve the purpose, the present invention provides the following technical solutions:

[0008] In one aspect, the present invention provides a polyurethane-polyurea aqueous dispersion comprising the following components:

[0009] Component a: 75-85wt% of polyol, including 20-80wt% of polyester polyol and 20-80wt% of polyether polyol, such as 77wt%, 79wt%, 81wt%, 83wt%;

[0010] Component b: 11-18 wt / % polyisocyanate, such as 13 wt%, 15 wt%, 17 wt%;

[0011] Component c: 1-2.9 wt / % of a hydrophilic compound, wherein the hydrophilic compound contains 2-3 groups reactive with NCO, wherein the hydrophilic groups of the hydrophilic compound include one or more of ionic groups and potential ionic groups, for example, 1.5 wt%, 2.0 wt%, 2.5 wt%;

[0012] Optional component d: 0-3 wt / %, an alcohol chain extender different from component a, such as 1 wt / %, 1.5 wt / %, 2 wt / %, 2.5 wt / %;

[0013] Optional component e: 0.5-2 wt / % of a compound that ionizes component c, for example 1.0 wt / %, 1.5 wt / %;

[0014] Component f: 0-4 wt / % of a polyamine having a number average molecular weight not exceeding 500 g / mol, for example 1 wt / %, 2 wt / %, 3 wt / %;

[0015] Component g: 0.5-3wt / % triazole compound, for example 0.6wt%, 0.8wt%, 1.0wt%, 1.5wt%, 2.0wt%, 2.5wt%.

[0016] Wherein, the polyester polyol in component a is obtained by reacting aliphatic dicarboxylic acid and aromatic dicarboxylic acid and / or aromatic dicarboxylic anhydride with a molar ratio of 1.5-6:1 with small molecule polyol. The small molecule polyol for synthesizing the polyester polyol is selected from alcohols containing branches and / or ether bonds in the structure, including but not limited to neopentyl glycol, 2-methyl-1,3-propanediol, diethylene glycol, dipropylene glycol, 3-methyl-1,5-pentanediol or one or more;

[0017] The aromatic dicarboxylic acid and / or aromatic dicarboxylic anhydride is selected from one or more of phthalic acid and phthalic anhydride, preferably isophthalic acid; the aliphatic dicarboxylic acid is preferably adipic acid.

[0018] In the present invention, the component b) is one or more of aromatic, aliphatic and alicyclic polyisocyanates, preferably one or more of aromatic, aliphatic and alicyclic polyisocyanates having at least two isocyanate groups. The preferred molecular formula is Y(NCO)2, wherein Y represents a divalent aliphatic hydrocarbon group containing 4 to 12 carbon atoms, a divalent alicyclic hydrocarbon group containing 6 to 15 carbon atoms, a divalent aromatic hydrocarbon group containing 6 to 15 carbon atoms, or a divalent aromatic aliphatic hydrocarbon group containing 7 to 15 carbon atoms. Suitable diisocyanates may be tetramethylene diisocyanate, methyl pentamethylene diisocyanate, hexamethylene diisocyanate, dodecamethylene diisocyanate, 1,4-cyclohexane diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, 4,4′-dicyclohexylpropane diisocyanate, 1,4-phenylene diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4′-diphenylmethane diisocyanate, 2,2′- and 2,4′-diphenylmethane diisocyanate, tetramethylxylyl diisocyanate, p-xylylene diisocyanate, p-isopropylidene diisocyanate and mixtures of these compounds.

[0019] In the present invention, the component b) may also include a small amount of polyisocyanates with higher functionality known per se in polyurethane chemistry or modified polyisocyanates containing, for example, carbodiimide groups, allophanate groups, isocyanurate groups, urethane groups and / or biuret groups. Preferred are hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, diphenylmethane diisocyanate, toluene diisocyanate.

[0020] In the present invention, the component c is selected from one or more of dimethylolpropionic acid, dimethylolbutanoic acid, dihydroxysuccinic acid, N-(2-aminoethyl)-2-aminoethanesulfonic acid, N-(3-aminopropyl)-2-aminoethanesulfonic acid and salts thereof, wherein the salt comprises one or more of the corresponding alkali metal salts, alkaline earth metal salts or ammonium salts, and preferably the component c is dimethylolpropionic acid.

[0021] In the present invention, the component d) is selected from one or more of ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,3-butanediol, 2,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, and 1,4-cyclohexanedimethanol; preferably diethylene glycol and dipropylene glycol containing ether bonds.

[0022] In the present invention, the component e) is a volatile tertiary amine substance that can ionize the component c), preferably triethylamine.

[0023] In the present invention, the component f) is a polyamine with a relative molecular weight of 60 to 500, such as one or two of ethylenediamine, 1,2-diaminopropane, 1,4-diaminobutane, 1,6-hexanediamine, 2-methylpentane-1,5-diamine, isophoronediamine, 4,4-diaminodicyclohexylmethane, piperazine and diethylenetriamine; preferably ethylenediamine and isophoronediamine.

[0024] In the present invention, the component g) is a triazole compound having at least two groups reactive with NCO, such as 3-amino-1,2,4-triazole, 4-amino-1,2,4-triazole, 3-amino-5-methyl-1,2,4-triazole, 5-amino-1,2,4-triazole, and the like.

[0025] On the other hand, the present invention also provides a method for preparing a polyurethane-polyurea aqueous dispersion, the method comprising the following steps:

[0026] Component a), component b), component c), component d) and acetone are put into a reaction kettle and reacted at 60-90° C. to obtain a prepolymer of terminal isocyanate, after which acetone is added for dilution, component e) is added for neutralization, and an acetone solution of component g) is added for further reaction. After the reaction is completed, water is added for dispersion under high-speed stirring, and after dispersion, component f) diluted with water is added for chain extension reaction to obtain a dispersion containing acetone, and the dispersion is decompressed to remove acetone to obtain a polyurethane-polyurea aqueous dispersion free of solvent.

[0027] In a specific embodiment, the preparation method comprises the following steps:

[0028] (1) adding polyester polyol, polyether polyol, polyisocyanate, hydrophilic compound, alcohol chain extender and solvent into a reactor to react until the NCO content reaches 1.5wt%-2wt%;

[0029] (2) After cooling, a solvent is added to dilute, and then a compound that ionizes component c is added to neutralize it, and a triazole compound is added to react;

[0030] (3) adding water for dispersion, adding an amine chain extender for chain extension, and distilling and separating the solvent to obtain a polyurethane-polyurea aqueous dispersion.

[0031] In the present invention, the reaction temperature in step (1) is 80-90°C;

[0032] In the present invention, the temperature after cooling in step (2) is 30-50° C., the dilution solvent is selected from acetone, and the amount of the solvent added is not particularly limited, preferably 0.1-0.5 times the mass of the mixture; the neutralization reaction time is 2-10 min; the reaction time of adding triazole is 10-30 min;

[0033] In the present invention, the amount of water used in step (3) is 1.3 to 1.7 times the amount of the compound in step (2); and the time of the chain extension reaction is 5 to 30 minutes.

[0034] The aqueous dispersion of polyurethane-polyurea according to the present invention has a solid content of 35-40 wt %, a pH value of preferably 6-10, and an average particle size of 80-300 nm.

[0035] Finally, the present invention also provides a method for preparing a soft elastic product, comprising the step of applying a liquid containing a polyurethane-polyurea aqueous dispersion to a mold required for preparing the soft elastic product; preferably, the soft elastic product includes gloves and / or condoms; and the polyurethane-polyurea aqueous dispersion adopts the polyurethane-polyurea aqueous dispersion described above.

[0036] The technical solution provided by the present invention has the following beneficial effects:

[0037] The polyurethane-polyurea dispersion provided by the present invention is prepared by reacting 20-80wt% or more of polyester polyol and 20-80wt% of polyether polyol. The polyester polyol is obtained by reacting aliphatic dicarboxylic acid and aromatic dicarboxylic acid and / or aromatic dianhydride with diol of specific structure in a specific molar ratio. The polyurethane-polyurea dispersion is used to prepare soft elastic products, such as gloves, which have excellent comprehensive properties, can take into account good tensile strength and elongation, and give the gloves excellent wearability. The introduction of triazole chain extenders improves the polarity of the chain segments, giving the polyurethane good resistance to polar solvents, especially disinfectant alcohol. The polyurethane-polyurea dispersion of the present invention can be used to prepare soft elastic products suitable for medical, household and industrial use, such as gloves, and is also particularly suitable for the production of condoms. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present invention, the present invention will be further described below in conjunction with examples. It should be understood that the following examples are only for a better understanding of the present invention and do not mean that the present invention is limited to the following examples.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the invention belongs. The term "and / or" as may be used herein includes any and all combinations of one or more of the associated listed items.

[0040] Where specific experimental steps or conditions are not specified in the examples, the corresponding conventional experimental steps or conditions in the art can be used. The reagents or instruments used without specifying the manufacturer are all conventional products that can be purchased commercially.

[0041] Isophorone diamine (IPDA), hexamethylene diisocyanate (HDI), 4,4'-dicyclohexylmethane diisocyanate (HMDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI),

[0042] Polyester polyol 1: Poly(adipate-isophthalic acid-2-methyl-1,3-propylene glycol) polyester (the molar ratio of adipic acid to phthalic acid is 1.9:1) Mn=2000

[0043] Polyester polyol 2: Poly(adipic acid-isophthalic acid-diethylene glycol) polyester (the molar ratio of adipic acid to phthalic acid is 5:1) Mn = 2000

[0044] Polyester polyol 3: Poly(adipic acid-isophthalic acid-dipropylene glycol) polyester (the molar ratio of adipic acid to phthalic acid is 4:1) Mn=2000

[0045] Polyester polyol 4: Poly(3-methyl-1,5-pentanediol) adipic acid-isophthalic acid polyester (the molar ratio of adipic acid to phthalic acid is 6:1) Mn = 2000

[0046] Polyester polyol 5: Poly(adipic acid-isophthalic acid-ethylbutyl 1,3-propylene glycol) polyester (the molar ratio of adipic acid to phthalic acid is 5.5:1) Mn=2000

[0047] Polyester polyol 6: Poly(adipic acid-isophthalic acid-1,4-butanediol) polyester (the molar ratio of adipic acid to phthalic acid is 1.9:1) Mn=2000

[0048] Polyester polyol 7: Poly(adipic acid-isophthalic acid-1,6-hexanediol) polyester (the molar ratio of adipic acid to phthalic acid is 1.9:1) Mn=2000

[0049] Polyester polyol 8: Poly(adipate-isophthalic acid-2-methyl 1,3-propylene glycol) polyester (the molar ratio of adipic acid to phthalic acid is 1.3:1) Mn=2000

[0050] Polyester polyol 9: poly(adipate-isophthalate-2-methyl-1,3-propylene glycol) polyester (the molar ratio of adipic acid to phthalic acid is 6.3:1) Mn=2000, all from Wanhua Chemical Group Co., Ltd.;

[0051] Polyether polyol: polytetramethylene glycol Mn=2000, functionality 2, Mitsubishi Chemical, Japan;

[0052] Dimethylolpropionic acid (DMPA): Perstorp;

[0053] 1,4-Butanediol, triethylamine, ethylenediamine (EDA), 3-aminotriazole: Sinopharm Chemical Reagent Company.

[0054] Example 1

[0055] 250 g of polyester polyol 1, 250 g of polyether polyol, 25 g of IPDI, 60 g of HDI, 8.1 g of DMPA, and 130 g of acetone were added to a 1 L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and the mixture was stirred at 80-90° C. until the NCO reached 1.8 wt %. The mixture was cooled to 40-45° C. and 500 g of acetone was added for dilution, and then 5.2 g of triethylamine was added for neutralization for about 5 min, 6.0 g of 3-aminotriazole was added for reaction for 15 min, and then the mixture was dispersed by adding 980 g of water, and 8.90 g of IPDA was added for post-chain extension during stirring, and the reaction was carried out for 15 min. A solvent-free dispersion was obtained after acetone was separated by distillation, which had a solid content of 40 wt %, an average particle size of 163 nm, and a pH value of 8.0.

[0056] Example 2

[0057] 250 g of polyester polyol 2, 250 g of polyether polyol, 100 g of HDI, 8.1 g of DMPA, 10 g of 1,4-butanediol and 130 g of acetone were added to a 1 L four-necked round bottom flask equipped with a nitrogen inlet and outlet, and the mixture was stirred at 80-90° C. until the NCO reached 1.95 wt %. The mixture was cooled to 40-45° C. and 500 g of acetone was added for dilution, and then 5.2 g of triethylamine was added for neutralization for about 5 min, 6.0 g of 3-aminotriazole was added for reaction for 15 min, and then the mixture was dispersed by adding 1040 g of water, and 10.4 g of IPDA was added for post-chain extension during stirring, and the reaction was carried out for 15 min. A solvent-free dispersion was obtained after the acetone was separated by distillation, which had a solid content of 40 wt %, an average particle size of 178 nm, and a pH value of 8.1.

[0058] Example 3

[0059] 140 g of polyester polyol 3, 360 g of polyether polyol, 89 g of HDI, 10 g of DMPA, 5 g of 1,4-butanediol and 130 g of acetone were added to a 1 L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and the mixture was stirred at 80-90° C. until the NCO reached 1.71 wt %. The mixture was cooled to 40-45° C. and 500 g of acetone was added for dilution, and then 6.4 g of triethylamine was added for neutralization for about 5 min, 7.8 g of 3-aminotriazole was added for reaction for 15 min, and then the mixture was dispersed by adding 1010 g of water, and 5.7 g of IPDA was added for post-chain extension during stirring, and the reaction was carried out for 15 min. A solvent-free dispersion was obtained after acetone was separated by distillation, which had a solid content of 40 wt %, an average particle size of 158 nm, and a pH value of 7.9.

[0060] Example 4

[0061] 140 g of polyester polyol 4, 360 g of polyether polyol, 50 g of HDI, 54 g of HMDI, 9.3 g of DMPA, 2 g of diethylene glycol and 130 g of acetone were added to a 1 L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and the mixture was stirred at 80-90° C. until the NCO reached 1.82 wt %. The mixture was cooled to 40-45° C. and 500 g of acetone was added for dilution, and then 5.96 g of triethylamine was added for neutralization for about 5 min, 8.0 g of 3-aminotriazole was added for reaction for 15 min, and then the mixture was dispersed by adding 1010 g of water, and 6.8 g of IPDA was added for post-chain extension during stirring, and the reaction was carried out for 15 min. A solvent-free dispersion was obtained after acetone was separated by distillation, which had a solid content of 40 wt %, an average particle size of 177 nm, and a pH value of 8.5.

[0062] Example 5

[0063] 380 g of polyester polyol 5, 120 g of polyether polyol, 50 g of HDI, 54 g of MDI, 13 g of DMPA, and 130 g of acetone were added to a 1 L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and the mixture was stirred at 80-90° C. until the NCO reached 1.87 wt %. The mixture was cooled to 40-45° C. and 500 g of acetone was added for dilution, followed by the addition of 8.3 g of triethylamine for neutralization for about 5 min, the addition of 12 g of 3-aminotriazole for reaction for 15 min, and then the mixture was dispersed by adding 1010 g of water. A solvent-free dispersion was obtained after the acetone was separated by distillation, which had a solid content of 40 wt %, an average particle size of 166 nm, and a pH value of 8.0.

[0064] Example 6

[0065] 370 g of polyester polyol 5, 120 g of polyether polyol, 50 g of HDI, 62 g of MDI, 17 g of DMPA, and 130 g of acetone were added to a 1 L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and the mixture was stirred at 80-90° C. until the NCO reached 1.94 wt %. The mixture was cooled to 40-45° C. and 450 g of acetone was added for dilution, followed by the addition of 10.9 g of triethylamine for neutralization for about 5 min, the addition of 14 g of 3-aminotriazole for reaction for 15 min, and then the mixture was dispersed by adding 1032 g of water. A solvent-free dispersion was obtained after the acetone was separated by distillation, which had a solid content of 40 wt %, an average particle size of 126 nm, and a pH value of 8.3.

[0066] Comparative Example 1

[0067] The polyester in Example 1 was replaced with polyester polyol 6, and the rest remained unchanged. It had a solid content of 40 wt %, an average particle size of 171 nm, and a pH value of 8.3.

[0068] Comparative Example 2

[0069] The polyester in Example 1 was replaced with polyester polyol 7, and the rest remained unchanged. It had a solid content of 40 wt %, an average particle size of 179 nm, and a pH value of 8.3.

[0070] Comparative Example 3

[0071] The polyester in Example 1 was replaced with polyester polyol 8, and the rest remained unchanged. It had a solid content of 40 wt %, an average particle size of 178 nm, and a pH value of 8.3.

[0072] Comparative Example 4

[0073] The polyester in Example 1 was replaced with polyester polyol 9, and the rest remained unchanged. It had a solid content of 40 wt %, an average particle size of 185 nm, and a pH value of 8.0.

[0074] Comparative Example 5

[0075] The 3-aminotriazole in Example 1 was replaced by 12.1 g of IPDA, and the rest remained unchanged. It had a solid content of 40 wt %, an average particle size of 191 nm, and a pH value of 8.4.

[0076] Preparation of base resin (liquid) for gloves: dilute the dispersion prepared above with deionized water to a solid content of 15wt%, then add 0.5wt% of color paste and 5wt% of titanium dioxide, stir at a low speed (speed between 200-300r / min) for half an hour for use.

[0077] Preparation of coagulation liquid: Use deionized water to prepare an aqueous solution containing 7wt% CaCl2 and 5wt% release agent (calcium stearate), stir continuously for 1 hour, and set aside.

[0078] Preparation of gloves:

[0079] 1) Place the cleaned glove mold in an oven at 100°C for drying.

[0080] 2) Take out the glove mold, cool it down to 50-60℃, immerse it in the coagulation liquid for about 8s, take it out, and put it in a 120-140℃ oven to dry.

[0081] 3) Take out the dried glove mold, cool it to 60°C, immerse it in the prepared matrix resin for about 8 seconds, take it out and let it stand for 1 minute, then immerse it in 50°C deionized water for about 1 minute, take it out and bake it in a 130°C oven for about 15-20 minutes.

[0082] 4) After the baking is completed, the glove mold is taken out, immersed in a glove finishing agent, taken out, naturally dried, and demoulded to obtain a finished glove.

[0083] Performance Test:

[0084] Tensile strength and elongation test: The palm part of the glove is cut into a dumbbell shape with a width of 6mm and a length of 115mm, and the tensile strength is tested on a tensile machine, and the elongation is obtained at the same time. Alcohol resistance: After the glove is inflated, a 55wt% alcohol solution is sprayed on the surface and then the cracks between the fingers are observed for solubility.

[0085] The performance test results are shown in Table 1.

[0086]

[0087]

[0088] It can be seen from the table that the comprehensive performance of the gloves prepared based on the polyurethane-polyurea aqueous dispersion of the present invention in terms of tensile strength, elongation, etc. is significantly better than that of the comparative example and latex gloves, and the sample using the triazole chain extender is better than the latex gloves in terms of alcohol resistance.

[0089] It is easy to understand that the above embodiments are only examples for clear explanation and do not mean that the present invention is limited thereto. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the protection scope of the present invention.

Claims

1. A polyurethane-polyurea aqueous dispersion comprising the following components: Component a: 75-85wt% of polyol, including 20-80wt% of polyester polyol and 20-80wt% of polyether polyol; Component b: 11-18wt / % polyisocyanate; Component c: 1-2.9 wt / % of a hydrophilic compound, wherein the hydrophilic compound contains 2-3 groups reactive with NCO, and the hydrophilic groups of the hydrophilic compound include one or more of an ionic group and a potential ionic group; Optional component d: 0-3 wt / %, an alcohol chain extender different from component a; Component e: 0.5-2wt / % of a compound that ionizes component c; Component f: 0-4 wt / % of a polyamine having a number average molecular weight not exceeding 500 g / mol; Component g: 0.5-3wt / % triazole compound; The polyester polyol in component a is obtained by reacting aliphatic dicarboxylic acid and aromatic dicarboxylic acid and / or aromatic dicarboxylic anhydride in a molar ratio of 1.5-6:1 with small molecule polyol; the small molecule polyol for synthesizing the polyester polyol is selected from alcohols containing branches and / or ether bonds in the structure, selected from one or more of neopentyl glycol, 2-methyl-1,3-propanediol, diethylene glycol, dipropylene glycol, and 3-methyl-1,5-pentanediol; the component g) is a triazole compound having at least two groups that can react with NCO.

2. The polyurethane-polyurea aqueous dispersion according to claim 1, characterized in that The aromatic dicarboxylic acid and / or aromatic dicarboxylic anhydride is selected from one or more of phthalic acid and phthalic anhydride; and / or the aliphatic dicarboxylic acid is selected from adipic acid.

3. The polyurethane-polyurea aqueous dispersion according to claim 1, characterized in that The component b) is one or more of aromatic, aliphatic and alicyclic polyisocyanates.

4. The polyurethane-polyurea aqueous dispersion according to claim 2, characterized in that The component b) is one or more of aromatic, aliphatic and alicyclic polyisocyanates having at least two isocyanate groups.

5. The polyurethane-polyurea aqueous dispersion according to any one of claims 1 to 4, characterized in that The component c is selected from one or more of dihydroxymethylpropionic acid, dihydroxymethylbutyric acid, dihydroxysuccinic acid, N-(2-aminoethyl)-2-aminoethanesulfonic acid, N-(3-aminopropyl)-2-aminoethanesulfonic acid and salts thereof, wherein the salt comprises one or more of the corresponding alkali metal salts, alkaline earth metal salts or ammonium salts.

6. The polyurethane-polyurea aqueous dispersion according to any one of claims 1 to 4, characterized in that The component d) is selected from one or more of ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butylene glycol, 1,3-butylene glycol, 2,3-butylene glycol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, and 1,4-cyclohexanedimethanol.

7. The polyurethane-polyurea aqueous dispersion according to any one of claims 1 to 4, characterized in that The component e) is a volatile tertiary amine substance that can ionize the component c).

8. The polyurethane-polyurea aqueous dispersion according to any one of claims 1 to 4, characterized in that The component e) is triethylamine.

9. The polyurethane-polyurea aqueous dispersion according to any one of claims 1 to 4, characterized in that The component f) is a polyamine with a relative molecular weight of 60 to 500, and the polyamine is one or two of ethylenediamine, 1,2-diaminopropane, 1,4-diaminobutane, 1,6-hexanediamine, 2-methylpentane-1,5-diamine, isophoronediamine, 4,4-diaminodicyclohexylmethane, piperazine and diethylenetriamine.

10. The polyurethane-polyurea aqueous dispersion according to any one of claims 1 to 4, characterized in that: The component g) is selected from 3-amino-1,2,4-triazole, 4-amino-1,2,4-triazole, 3-amino-5-methyl-1,2,4-triazole, and 5-amino-1,2,4-triazole.

11. The method for preparing a polyurethane-polyurea aqueous dispersion according to any one of claims 1 to 10, characterized in that: The method comprises the following steps: Component a), component b), component c), component d) and acetone are put into a reaction kettle and reacted at 60-90° C. to obtain a prepolymer of terminal isocyanate, after dilution with acetone, component e) is added for neutralization, and an acetone solution of component g) is added to continue the reaction. After the reaction is completed, water is added under high-speed stirring for dispersion, and after dispersion, component f) diluted with water is added for chain extension reaction to obtain a dispersion containing acetone, and the dispersion is decompressed to remove acetone to obtain a polyurethane-polyurea aqueous dispersion free of solvent.

12. A soft elastic product, characterized in that: The soft elastic product is prepared based on the polyurethane-polyurea aqueous dispersion according to any one of claims 1 to 10 or based on the polyurethane-polyurea aqueous dispersion prepared by the preparation method according to claim 11, and the soft elastic product includes gloves and / or condoms.

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