Polyurethane fluorine-free easy-to-decontamination finishing agent and preparation method thereof

Abstract

The present invention discloses a polyurethane fluorine-free easy-to-decontamination finishing agent and a preparation method thereof, wherein the polyurethane fluorine-free easy-to-decontamination finishing agent is prepared by polycondensation reaction of diol compounds, polyisocyanates, functional monomers and hydrophilic monomers to generate polyurethane polymers, and then obtained after emulsification. The present invention organically combines low-surface-energy fluorine-free water-repellent groups and hydrophilic polyether groups through the condensation reaction of polyurethane, and in a dry state, the low-surface-energy water-repellent groups occupy the fiber surface, reduce the surface tension of the fiber, prevent dirt adsorption, and prevent water and dirt from penetrating when contacting the fabric to achieve the purpose of anti-fouling. In water, the high-surface-energy hydrophilic polyether chain segments flip and migrate to the fiber surface, and are oriented and arranged on the fiber surface through hydration to form a hydration layer, which reduces the water-fiber interfacial tension, thereby achieving the performance of easy decontamination.

Description

Technical Field

[0001] The invention belongs to the field of polymers and textile auxiliaries, and specifically relates to the composition of a polyurethane fluorine-free easy-to-decontamination finishing agent, and also relates to a preparation method of the polyurethane fluorine-free easy-to-decontamination finishing agent. The invention is applied to easy-to-decontamination finishing of textile fiber fabrics. Background Art

[0002] As a functional auxiliary agent, easy-to-remove finishing agents are widely used. When the stained fabric is washed, the oily dirt, fabric and water phase are in a state of equilibrium. By reducing the interfacial tension between the water phase and the fiber phase or increasing the interfacial tension between the oil phase and the fiber, the dirt can easily fall off the fabric in the form of beads and enter the washing liquid, thus achieving an effective easy-to-remove effect.

[0003] At present, the existing easy-to-remove finishing agents are usually made by copolymerizing hydrophobic long-chain fluorinated acrylate monomers and monomers with hydrophilic long-chain polyoxyethylene structures. In this structure, the low-surface-energy fluorocarbon segments automatically migrate to the fiber surface in the air to reduce the fiber-air surface tension, achieving an anti-fouling effect; during water washing, the high-surface-energy hydrophilic polyoxyethylene segments will flip and migrate to the fiber surface. Through hydration, the polyoxyethylene segments will change from a curled state to a stretched and elongated state, thereby oriented and forming a hydration layer on the fiber surface. The presence of the hydrophilic hydration layer on the fiber surface reduces the interfacial tension of the water-fiber interface, and the stains on the fiber surface can be dispersed into the water to achieve a decontamination effect.

[0004] As the environmental and ecological problems caused by the low biodegradability and cumulative effects of fully fluorinated compounds have attracted global attention, reducing the use of fluorides or replacing them with non-fluorinated products has become a trend and necessity. Summary of the invention

[0005] The first object of the present invention is to provide a polyurethane fluorine-free easy-to-decontamination finishing agent which has a simple preparation method, good easy-to-decontamination effect and is environmentally friendly.

[0006] The first object of the present invention is achieved through the following technical measures: a polyurethane fluorine-free easy-to-remove finishing agent, characterized in that it is prepared by polycondensing a diol compound, a polyisocyanate, a functional monomer and a hydrophilic monomer to generate a polyurethane polymer, which is then emulsified.

[0007] The present invention organically combines low surface energy fluorine-free water-repellent groups and hydrophilic polyether groups through the condensation reaction of polyurethane. In the dry state, the low surface energy water-repellent groups occupy the fiber surface, reduce the surface tension of the fiber, prevent dirt adsorption, and prevent water and dirt from penetrating when contacting the fabric to achieve the purpose of anti-fouling. In water, the high surface energy hydrophilic polyether chain segments flip and migrate to the fiber surface, and through hydration, they are oriented and arranged on the fiber surface to form a hydration layer, which reduces the water-fiber interface tension, thereby achieving the effect of easy decontamination.

[0008] The structural formula of the diol compound of the present invention is:

[0009]

[0010] R1: a saturated or unsaturated straight or branched long carbon chain alkyl group with a carbon number of 6 to 30, preferably a saturated straight chain alkyl group, wherein a straight chain saturated alkyl group with a carbon chain number of 10 to 22 has the best effect. R1 includes but is not limited to octyl, decyl, lauryl, tetradecyl, hexadecyl, eicosyl, etc.

[0011] R2: a straight chain or branched chain alkyl group with 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, or a straight chain or branched chain alkyl group with two carbonyl groups;

[0012] R3: a straight chain or branched chain alkyl group with 1 to 6 carbon atoms, including but not limited to methyl, ethyl, propyl, butyl and the like.

[0013] The diol compound of the present invention is obtained by catalytic reduction of the following first compound (Formula I), and suitable catalysts include sodium borohydride, lithium aluminum hydride, etc.:

[0014]

[0015] R1: a saturated or unsaturated straight or branched long carbon chain alkyl group having 6 to 30 carbon atoms;

[0016] R2: a straight chain or branched chain alkyl group having 2 to 8 carbon atoms, or a straight chain or branched chain alkyl group having two carbonyl groups;

[0017] R3: a linear or branched alkyl group having 1 to 6 carbon atoms.

[0018] The first compound (Formula I) of the present invention is obtained by sequentially reacting the following second compound (Formula II) and third compound (Formula III) through condensation reaction, and then further reacting with the fourth compound (Formula IV) to obtain:

[0019]

[0020] R0: independently a hydrogen atom;

[0021] R1: a saturated or unsaturated straight or branched long carbon chain alkyl group having 6 to 30 carbon atoms;

[0022] R2: a straight or branched alkyl group having 2 to 8 carbon atoms;

[0023] R4: a saturated or unsaturated carbon chain group with 1 to 6 carbon atoms;

[0024] R5: a linear, branched or cyclic alkane group having 2 to 8 carbon atoms;

[0025] X: is a halogen atom or an α,β-unsaturated carbonyl group.

[0026] The second compound of the present invention is a series of derivatives of formate, including but not limited to methyl formate, ethyl formate or butyl formate.

[0027] The third compound of the present invention is one or a combination of two or more of a series of long-chain alkyl esters, including but not limited to methyl laurate, ethyl laurate, methyl cocoate, ethyl cocoate, methyl palmitate, ethyl palmitate, methyl stearate, ethyl stearate, methyl oleate, butyl oleate, ethyl oleate, methyl arachidate, ethyl arachidate, methyl behenate, ethyl behenate, etc. or a combination of two or more.

[0028] The fourth compound of the present invention is a dihalogenated hydrocarbon substituted by a halogen atom or an alpha-atomic unsaturated carbonyl group, including but not limited to 1,2-dichloroethane, 1,2-dibromoethane, 1,4-dichlorobutane, 1,4-dibromobutane, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate and 1,6-hexanediol di(meth)acrylate, one or a combination of two or more thereof.

[0029] The first compound (Formula I) of the present invention is prepared by a stepwise reaction of a second compound (Formula II), a third compound (Formula III) and a fourth compound (Formula IV), wherein the molar ratio is the second compound (Formula II): the third compound (Formula III): the fourth compound (Formula IV) = 1-1.5:1:1-1.5. Specifically, the second compound (Formula II) and the third compound (Formula III) are subjected to a first condensation reaction, the reaction temperature is 0-50°C, the reaction time is 1-24h, the reaction catalyst includes but is not limited to sodium hydride, sodium methoxide, sodium ethoxide, potassium tert-butoxide, etc., and the molar ratio of the amount of the catalyst to the second compound (Formula II) is 2-1:1.

[0030] The first compound (Formula I) of the present invention is prepared by a step-by-step reaction of a second compound (Formula II), a third compound (Formula III) and a fourth compound (Formula IV), specifically a condensation reaction of the second compound (Formula II) and the third compound (Formula III) and a second step reaction of the fourth compound (Formula IV), the reaction catalyst includes but is not limited to sodium hydride, sodium methoxide, sodium ethoxide, potassium tert-butoxide, etc., the molar ratio of the amount of the reaction catalyst to the fourth compound (Formula IV) is 2 to 1:1, the reaction temperature is 0 to 50°C, and the reaction time is 1 to 24 hours.

[0031] The polyisocyanate of the present invention is one or more combinations of substances with two or more isocyanate groups, including but not limited to one or more combinations of aromatic or aliphatic isocyanates such as toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), dicyclohexylmethane diisocyanate (H12MDI), xylylene diisocyanate (XDI), tetramethyl metaxylylene diisocyanate (TMXDI) and trimethyl-1,6-hexamethylene diisocyanate (TMHDI), and one or more combinations of derivatives such as dimers, trimers, biuret, carbodiimide modification of the aforementioned diisocyanates, reaction products with propylene glycol, and reaction products with trimethylolpropane. Preferred are one or a combination of two or more of diphenylmethane diisocyanate (MDI), isophorone diisocyanate (IPDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI) and derivatives thereof.

[0032] The functional monomer of the present invention is a small molecule compound with active hydrogen, that is, a polyol or phenol with two or more hydroxyl groups, or a polyamine with two or more amino groups, or a compound with a single active hydrogen functional group such as amide, oxime, imidazole, etc., or a combination of two or more compounds. Including but not limited to 1,4-butanediol, ethylene glycol, diethylene glycol, 1,6-hexanediol, glycerol, trimethylolpropane, ditrimethylolpropane, dimethylolpropionic acid, dimethylolbutyric acid, tartaric acid, diethanolamine, triethanolamine, methyldiethanolamine and other polyhydroxy compounds, or ethylenediamine, hexamethylenediamine, isophoronediamine, diamine, diethylenetriamine, or phenols, caprolactam, ethyl acetoacetate, diethyl malonate, acetone oxime, methyl ethyl ketone oxime, 3,5-dimethylpyrazole and other compounds containing a single active hydrogen atom or a combination of two or more.

[0033] The structural formula of the hydrophilic monomer of the present invention is:

[0034]

[0035] R6: independently hydrogen or methyl;

[0036] Y: independently hydroxyl, primary amine, or secondary amine;

[0037] x, y, z: values ​​ranging from 0 to 100, and x, y, z cannot be zero at the same time.

[0038] The hydrophilic monomer of the present invention is various polyethylene glycols, polypropylene glycols, or block polymers of polyethylene glycol / polypropylene glycol or various polyetheramines, etc. The preferred molecular weight of the hydrophilic monomer is 1000 to 6000. Commercial products such as the VORANOL series of DOW Company of the United States and the JEFFAMINE series of HUNTSMAN Company of the United States can be used.

[0039] The second object of the present invention is to provide a method for preparing the above-mentioned polyurethane fluorine-free easy-to-decontamination finishing agent.

[0040] The second object of the present invention is achieved by the following technical measures: a method for preparing the above-mentioned polyurethane fluorine-free easy-to-remove finishing agent, characterized in that a diol compound, a functional monomer, a hydrophilic monomer and a polyisocyanate are subjected to a condensation reaction in a solvent to generate a polyurethane polymer, the reaction temperature is 50-100°C, the reaction time is 2-8h, the weight percentage of the hydrophilic monomer is 20-80%, and the solvent is acetone, butanone, methyl isobutyl ketone, benzene, toluene, ethyl acetate or butyl acetate; and then the polyurethane polymer is mixed with an emulsifier and deionized water, and then homogenized and emulsified to obtain the polyurethane fluorine-free easy-to-remove finishing agent, wherein the amount of the emulsifier is 10-20% of the polyurethane polymer.

[0041] The emulsifier of the present invention is linear fatty alcohol polyoxyethylene ether, isomeric fatty alcohol polyoxyethylene ether, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, fatty acid glyceride, fatty acid polyglycerol ester or alkyl glucoside, or one or a combination of two or more of alkylamine, alkyl quaternary ammonium salt, alkyl ester quaternary ammonium salt, alkyl acyl quaternary ammonium salt and polyoxyethylene alkyl quaternary ammonium salt.

[0042] Compared with the prior art, the present invention has the following significant effects:

[0043] The present invention organically combines low surface energy fluorine-free water-repellent groups and hydrophilic polyether groups through the condensation reaction of polyurethane. After the fiber is finished by the product of the present invention, the low surface energy water-repellent groups occupy the fiber surface in a dry state, reducing the surface tension of the fiber, preventing dirt adsorption and preventing water and dirt from penetrating when contacting the fabric to achieve the purpose of anti-fouling. In water, the high surface energy hydrophilic polyether chain segments flip and migrate to the fiber surface, and through hydration, they are oriented and arranged on the fiber surface to form a hydration layer, reducing the water-fiber interface tension, thereby achieving the effect of easy decontamination. DETAILED DESCRIPTION

[0044] Example 1

[0045] In a three-necked flask equipped with a stirring system and a reflux condenser, add 51.2g of methyl formate, 213g of methyl laurate, and 55.3g of a methanol solution of sodium methoxide, and react at 30-40°C for 8h. After the reaction is completed, add 50% acetic acid solution to the flask to adjust the pH of the entire system to weak acidity, add an equal volume of saturated sodium chloride solution and shake vigorously, separate the organic layer, and extract the aqueous layer with 15mL of toluene. Combine the extract and the organic phase and dry them with anhydrous sodium sulfate. Transfer the dried organic layer to a rotary evaporator and distill under reduced pressure to obtain the intermediate product.

[0046] Then take 192g of the above product, add 22.7g of methanol solution of sodium methoxide, add 35.2g of 1,4-dibromobutane dropwise at 0-5°C, react at 0-5°C for 5h, add 22g of methanol solution of sodium borohydride, react at 0-5°C for 4h, evaporate part of the methanol, add water to separate, wash the organic phase with water until neutral, dry it with anhydrous sodium sulfate, then transfer it to a rotary evaporator, and distill it under reduced pressure to obtain a waxy intermediate.

[0047] Take 63.6 g of the above intermediate, add 72 g of methyl isobutyl ketone, 46.6 g of hexamethylene diisocyanate (HDI), 13.3 g of N-methylethanolamine, 222.3 g of polyethylene glycol PEG2000 (molecular weight 2000), and 0.04 g of dibutyltin dilaurate, react at 70°C for 6 hours, and after determining that there is no residual isocyanate in the system by the di-n-butylamine method, the reaction is completed, and the solvent is removed by reduced pressure distillation to obtain a polyurethane polymer product.

[0048] Take 32g of the above polyurethane polymer product, 0.16g of TWEEN 80 (Croda, UK), 0.18g of isomeric tridecanol polyoxyethylene 10 ether, 0.5g of acetic acid, and 66g of water, and emulsify them at high speed shear to obtain a polyurethane easy-to-decontamination finishing agent product.

[0049] Example 2

[0050] In a three-necked flask equipped with a stirring system and a reflux condenser, add 63.2g of ethyl formate, 276.7g of methyl palmitate, and 54.3g of a methanol solution of sodium methoxide, and react at 30-40°C for 8h. After the reaction is completed, add 50% acetic acid solution to the flask to adjust the pH of the entire system to weak acidity, add an equal volume of saturated sodium chloride solution and shake vigorously, separate the organic layer, and extract the aqueous layer with 15mL of toluene. Combine the extract and the organic phase and dry them with anhydrous sodium sulfate. Transfer the dried organic layer to a rotary evaporator and distill under reduced pressure to obtain the intermediate product.

[0051] Then take 231.2g of the above product, add 26.7g of methanol solution of sodium methoxide, add 36g of 1,4-dibromobutane dropwise at 0-5°C, react at 0-5°C for 5h, add 19g of methanol solution of sodium borohydride, react at 0-5°C for 4h, evaporate part of the methanol, add water to separate, wash the organic phase with water until neutral, dry it with anhydrous sodium sulfate, then transfer it to a rotary evaporator, and distill it under reduced pressure to obtain a waxy intermediate.

[0052] Take 61.5 g of the above intermediate, add 70 g of methyl isobutyl ketone, 37.7 g of hexamethylene diisocyanate (HDI), 11.3 g of N-methylethanolamine, 297 g of polyoxyethylene polyoxypropylene ether (molecular weight 3000), and 0.05 g of dibutyltin dilaurate, react at 70 ° C for 6 hours, and after determining that there is no residual isocyanate in the system by the di-n-butylamine method, the reaction is completed, and the solvent is removed by reduced pressure distillation to obtain a polyurethane polymer product.

[0053] Take 32g of the above polyurethane polymer product, 1.2g of octadecyl polyoxyethylene ammonium chloride (Ethoquat O / 12, AkzoNobel), 1.1g of isomeric tridecanol polyoxyethylene 10 ether, 0.5g of acetic acid, and 65g of water, and emulsify at high speed shear to obtain a polyurethane easy-to-clean finishing agent product.

[0054] Example 3

[0055] In a three-necked flask equipped with a stirring system and a reflux condenser, add 68.2g of methyl formate, 219.3g of methyl laurate, and 56.3g of a methanol solution of sodium methoxide, and react at 30-40°C for 8h. After the reaction is completed, add 50% acetic acid solution to the flask to adjust the pH of the entire system to weak acidity, add an equal volume of saturated sodium chloride solution and shake vigorously, separate the organic layer, and extract the aqueous layer with 15mL of toluene. Combine the extract and the organic phase and dry them with anhydrous sodium sulfate. Transfer the dried organic layer to a rotary evaporator and distill under reduced pressure to obtain the intermediate product.

[0056] Then take 202g of the above product, add 22.7g of methanol solution of sodium methoxide, add 58.9g of 1,6-hexanediol diacrylate dropwise at 30°C, react at 30°C for 5h, then add 21g of sodium borohydride methanol solution, cool to 0-5°C and react for 4h, add 50% acetic acid solution to adjust the whole system to weak acidity, add water to split, wash the organic phase with water to neutrality and then dry it with anhydrous sodium sulfate, then transfer it to a rotary evaporator and distill it under reduced pressure to obtain a waxy intermediate.

[0057] Take 83.2 g of the above intermediate, add 94.5 g of methyl isobutyl ketone, 12.4 g of dimethylol propionic acid, 254 g of JEFFAMINED2000 (HUNTSMAN Company), 0.04 g of dibutyltin dilaurate, add 47.8 g of toluene diisocyanate (TDI) dropwise, react at 70°C for 6 hours, and after determining by the di-n-butylamine method that there is no residual isocyanate in the system, the reaction is terminated, and the solvent is removed by reduced pressure distillation to obtain a polyurethane polymer product.

[0058] Take 32 g of the above polyurethane polymer product, 1.2 g of TWEEN 80, 0.78 g of castor oil polyoxyethylene ether, 0.5 g of triethylamine, and 64 g of water, and emulsify them at high speed shear to obtain a polyurethane easy-to-decontamination finishing agent product.

[0059] Example 4

[0060] In a three-necked flask equipped with a stirring system and a reflux condenser, add 63.2g of ethyl formate, 303.3g of palm methyl ester, and 67g of an ethanol solution of sodium ethoxide, and react at 30-40°C for 8h. After the reaction is completed, add 50% acetic acid solution to the flask to adjust the pH of the entire system to weak acidity, add an equal volume of saturated sodium chloride solution and shake vigorously, separate the organic layer, and extract the aqueous layer with 15mL of toluene. Combine the extract and the organic phase and dry them with anhydrous sodium sulfate. Transfer the dried organic layer to a rotary evaporator and distill under reduced pressure to obtain the intermediate product.

[0061] Then take 237.1g of the above product, add 28.5g of methanol solution of sodium methoxide, add 63.1g of 1,6-hexanediol diacrylate dropwise at 30°C, react at 30°C for 5h, then add 18.3g of sodium borohydride methanol solution, cool to 0-5°C and react for 4h, add 50% acetic acid solution to adjust the whole system to weak acidity, add water to split, wash the organic phase with water to neutrality and then dry it with anhydrous sodium sulfate, then transfer it to a rotary evaporator and distill it under reduced pressure to obtain a waxy intermediate.

[0062] Take 96 g of the above intermediate, add 109 g of methyl isobutyl ketone, 192 g of JEFFAMINE ED2003 (HUNTSMAN Company), 14.4 g of dihydroxymethylpropionic acid, 0.05 g of dibutyltin dilaurate, add 57.7 g of isophorone diisocyanate (IPDI) dropwise, react at 70 ° C for 6 hours, and after determining that there is no residual isocyanate in the system by the di-n-butylamine method, the reaction is completed, and the solvent is removed by reduced pressure distillation to obtain a polyurethane polymer product.

[0063] Take 32 g of the above-mentioned polyurethane hydrophobic compound product, 0.8 g of isomeric tridecanol polyoxyethylene 10 ether, 1.25 g of lauryl alcohol polyoxyethylene 7 ether, and 64 g of water, and emulsify them at high speed shear to obtain a polyurethane easy-to-decontamination finishing agent product.

[0064] Comparative Example 1

[0065] In a three-necked flask equipped with a stirring system and a reflux condenser, 199.5 g of polyoxyethylene polyoxypropylene ether (molecular weight 3000), 13.9 g of toluene diisocyanate (TDI), 1.8 g of N-methylethanolamine, 1.5 g of methyl ethyl ketone oxime, and 0.06 g of dibutyltin dilaurate were added, and the mixture was reacted at 70°C for 6 h. After no residual isocyanate was found in the system by the di-n-butylamine method, the reaction was terminated, and the solvent was removed by reduced pressure distillation to obtain a polyurethane compound product.

[0066] Take 32 g of the above polyurethane hydrophobic compound product, 0.5 g of acetic acid, and 67.5 g of water, and stir to obtain a product with uniform appearance.

[0067] Comparative Example 2

[0068] In a three-necked flask equipped with a stirring system and a reflux condenser, 204.8 g of JEFFAMINE ED2003 (HUNTSMAN Company), 3.1 g of N-methylethanolamine, 2.5 g of methyl ethyl ketone oxime, and 0.06 g of dibutyltin dilaurate were added, and 21 g of toluene diisocyanate (TDI) was added dropwise. The mixture was reacted at 70°C for 5 h. After no residual isocyanate was found in the system by the di-n-butylamine method, the reaction was terminated, and the solvent was removed by vacuum distillation to obtain a polyurethane compound product.

[0069] Take 32 g of the above polyurethane hydrophobic compound product, 0.5 g of acetic acid, and 67.5 g of water, and stir to obtain a product with uniform appearance.

[0070] Test methods and results

[0071] The fluorine-free waterproofing agents of Examples 1 to 4 and the products of Comparative Examples 1 and 2 were diluted with deionized water to a concentration of 50 g / L, and a one-dip-one-pad process was used. The products were dried at 110°C and heat-treated at 170°C for 60 seconds. The products were tested according to AATCC 130-2018 as the test method standard to determine the waterproofing effect at the initial stage and after 10 home washes (10HL) cycles. The results are shown in the following table:

[0072]

[0073] (Table 1)

[0074] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A polyurethane fluorine-free easy-to-decontamination finishing agent, characterized in that: It is obtained by polycondensation of diol compounds, polyisocyanates, functional monomers and hydrophilic monomers to generate polyurethane polymers, which are then emulsified. The structural formula of the diol compound is: R1: a saturated or unsaturated straight or branched long carbon chain alkyl group having 6 to 30 carbon atoms; R2: a straight chain or branched chain alkyl group having 2 to 8 carbon atoms, or a straight chain or branched chain alkyl group having two carbonyl groups; R3: a straight or branched alkyl group having 1 to 6 carbon atoms; The polyisocyanate is one or a combination of two or more substances with two or more isocyanate groups; The functional monomer is a small molecule compound having active hydrogen, and the small molecule compound having active hydrogen is a polyol or phenol having two or more hydroxyl groups, or a polyamine having two or more amino groups; The structural formula of the hydrophilic monomer is: R6: independently hydrogen or methyl; Y: independently hydroxyl, primary amine, or secondary amine; x, y, z: values ​​ranging from 0 to 100, and x, y, z cannot be zero at the same time.

2. The polyurethane fluorine-free easy decontamination finishing agent according to claim 1, characterized in that: The diol compound is obtained by catalytic reduction of the following first compound (Formula I): R1: a saturated or unsaturated straight or branched long carbon chain alkyl group having 6 to 30 carbon atoms; R2: a straight chain or branched chain alkyl group having 2 to 8 carbon atoms, or a straight chain or branched chain alkyl group having two carbonyl groups; R3: a linear or branched alkyl group having 1 to 6 carbon atoms.

3. The polyurethane fluorine-free easy decontamination finishing agent according to claim 2, characterized in that: The first compound is obtained by sequentially condensing the following second compound (Formula II) and third compound (Formula III), and then further adding the fourth compound (Formula IV): R0: independently a hydrogen atom; R1: a saturated or unsaturated straight or branched long carbon chain alkyl group having 6 to 30 carbon atoms; R3: a straight or branched alkyl group having 2 to 8 carbon atoms; R4: a saturated or unsaturated carbon chain group with 1 to 6 carbon atoms; R5: a linear, branched or cyclic alkane group having 2 to 8 carbon atoms; X: is a halogen atom or an α,β-unsaturated carbonyl group.

4. A method for preparing the polyurethane fluorine-free easy-to-decontamination finishing agent according to any one of claims 1 to 3, characterized in that: The polyurethane polymer is generated by polycondensation reaction of diol compound, functional monomer, hydrophilic monomer and polyisocyanate, and then the polyurethane polymer is mixed with emulsifier and deionized water, and then emulsified to obtain polyurethane fluorine-free easy-to-decontamination finishing agent.

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