CN111663338B - Preparation method of multifunctional water-based temperature-sensitive polyurethane finishing agent - Google Patents

Preparation method of multifunctional water-based temperature-sensitive polyurethane finishing agent Download PDF

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CN111663338B
CN111663338B CN202010648872.4A CN202010648872A CN111663338B CN 111663338 B CN111663338 B CN 111663338B CN 202010648872 A CN202010648872 A CN 202010648872A CN 111663338 B CN111663338 B CN 111663338B
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mass
prepolymer
finishing agent
polyether
water
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CN111663338A (en
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陈建芳
廖欢
曾光
周亭
张汇
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Hunan Institute of Engineering
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
    • D06M15/568—Reaction products of isocyanates with polyethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4804—Two or more polyethers of different physical or chemical nature
    • C08G18/4808—Mixtures of two or more polyetherdiols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4833—Polyethers containing oxyethylene units
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
    • C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
    • C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
    • C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
    • C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/46—Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic Table; Titanates; Zirconates; Stannates; Plumbates
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    • D06M16/00—Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/32—Polyesters
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    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
    • D06M2200/10—Repellency against liquids
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    • D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
    • D06M2200/25—Resistance to light or sun, i.e. protection of the textile itself as well as UV shielding materials or treatment compositions therefor; Anti-yellowing treatments

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Abstract

The invention discloses a preparation method of a multifunctional water-based temperature-sensitive polyurethane finishing agent. According to the invention, polyethylene glycol, polytetrahydrofuran ether glycol, dimethylolpropionic acid and the like are used as raw materials, dibutyl tin dilaurate is used as a catalyst to obtain an isocyanate-terminated prepolymer, and then nano titanium dioxide modification is realized through an in-situ loading technology in the process of polyurethane chain extension reaction. The method is simple and easy to implement, and the prepared polyurethane emulsion finishing agent is practical, high in cost performance, waterproof, moisture permeable, antibacterial, ultraviolet resistant and the like, and can be used in various fields of textile clothing and the like.

Description

Preparation method of multifunctional water-based temperature-sensitive polyurethane finishing agent
Technical Field
The invention belongs to the field of textile chemical industry, and particularly relates to a preparation method for a multifunctional aqueous temperature-sensitive polyurethane finishing agent modified by nano titanium dioxide through an in-situ loading technology.
Background
With the continuous improvement of the life quality of people, the performance requirements on clothing are further improved, and products with environmental protection, good practicability and multifunction are attracting more attention.
The water-based temperature-sensitive polyurethane (WTAU) finishing agent is an environment-friendly textile auxiliary agent, and the coating has the advantages of good mechanical property, waterproof moisture permeability, temperature sensitivity, self-repairing and the like, and can be used for processing breathable high-grade waterproof moisture-permeable coated fabrics integrating waterproof, moisture permeability, windproof and thermal insulation. Is widely applied to the textile fields of combat uniform, mountain climbing uniform, surgeon work uniform, dust-free room work uniform and the like. However, as most of the polyurethane finishing agents at present, the finishing agents still have single functions, and cannot meet the requirements of people on functional diversification of textile and clothing, for example, the finishing agents cannot meet the requirements of antibacterial property and ultraviolet resistance, and have certain limitations in application range. The nano titanium dioxide is used as an environment-friendly, chemically stable and easily available inorganic nano material, has the characteristics of ultraviolet resistance, antibacterial property and the like, and endows the excellent performance of the titanium dioxide to the aqueous temperature-sensitive polyurethane, so that the formed composite material is expected to realize various characteristics of high performance, no toxicity, water and moisture permeability, antibacterial property, ultraviolet resistance and the like. Based on the reasons, the nano titanium dioxide composite water-based temperature-sensitive polyurethane finishing agent is prepared by an in-situ loading technology, is environment-friendly, can meet various requirements of people on the wearability, and belongs to a green environment-friendly material advocated by the present.
Disclosure of Invention
The invention aims to provide a preparation method of a multifunctional water-based temperature-sensitive polyurethane finishing agent which is environment-friendly, nontoxic, waterproof, moisture-permeable, antibacterial, uvioresistant and the like and can form a coating with good performance.
The aim of the invention is realized by the following technical scheme:
a preparation method of a multifunctional water-based temperature-sensitive polyurethane finishing agent comprises the following steps:
(1) Drying polytetrahydrofuran ether glycol (PTMG), polyethylene glycol (PEG), dimethylolpropionic acid (DMPA) before use to remove water, and soaking 1, 4-Butanediol (BDO) and butanone in 4A molecular sieve for 5-8 days before use;
(2) Placing the dried polyethylene glycol and polytetrahydrofuran ether glycol (hereinafter referred to as polyether) into a three-neck flask with a stirrer according to the mass ratio of 0.8-1.2:1And dropping dibutyl tin dilaurate serving as a catalyst with the mass of polyether of 0.01-0.04 percent (preferably 0.02 percent), heating to 100-140 ℃ (preferably 120 ℃), and vacuumizing to remove water for 2-5 h (preferably 3 h); cooling to below 80 ℃, removing vacuum, adding nitrogen for protection, adding butanone with the mass of 80% -90% of that of polyether and isophorone diisocyanate (IPDI) with the mass of 1.4-1.6 times of that of polyether into a three-mouth bottle, and reacting for 0.5-2 h (preferably 1 h); then adding catalyst with the mass of 0.02% -0.05% (preferably 0.03%) of polyether into the reaction system, and continuously stirring and reacting for 0.5-2 h (preferably 1 h) to generate isocyanate-terminated prepolymer; sequentially adding dimethylolpropionic acid with the mass of 5% -7% of the prepolymer and 1, 4-butanediol with the mass of 5% -7% of the prepolymer into the prepolymer, when the reaction is carried out for 0.5-1 h (namely when polyurethane is subjected to chain extension reaction), adding tetrabutyl titanate with the mass of 0.1% -0.5% of the prepolymer, cooling to below 60 ℃ after the reaction is carried out for 1-3 h (preferably 2 h), adding triethylamine with the mass of 6% -8% of the prepolymer, continuously reacting for 0.3-1 h (preferably 0.5 h), and then adding distilled water with the mass of 3-5 times of the prepolymer, and stirring at a high speed for 0.1-0.5 h to obtain the nano TiO with the mass of 15% -25% of the solid content 2 Water-dispersible emulsion of WSPU;
(3) For the nano TiO obtained in the step (2) 2 And (3) carrying out reduced pressure distillation on the/WSPU water dispersion emulsion to obtain the polyurethane emulsion finishing agent.
Further, in the step (1), the molecular weight of the PTMG is 2000; the molecular weight of PEG is 400, 600, 1000 or 2000.
Further, in the step (1), the drying and dewatering are vacuum drying and dewatering, the dewatering temperature is 70-100 ℃ (preferably 80 ℃), and the dewatering time is 6-10 h (preferably 8 h).
Further, in the step (3), the distillation temperature is 80 to 85 ℃ and the time is 0.2 to 1.2 hours (preferably 0.5 hours).
The invention has the beneficial effects that:
the method is simple and easy to implement, and the prepared polyurethane emulsion finishing agent is practical, high in cost performance, waterproof, moisture permeable, antibacterial, ultraviolet resistant and the like, and can be used in various fields of textile clothing and the like.
Drawings
FIG. 1 is an SEM image of a sample prepared according to example 1 of the present invention, A is nano TiO 2 B is polyester fabric before finishing, C is TiO 2 The WSPU emulsion is used for finishing fabrics.
FIG. 2 is a nano TiO 2 Different PEG relative molecular mass nano TiO with loading capacity of 0.1 percent 2 Moisture permeability curve graph of fabric after WTSPU emulsion finishing; in the figure, curve A is blank, curve B is PEG2000, curve C is PEG1000, curve D is PEG600, and curve E is PEG 400.
FIG. 3 shows different nano-TiO's prepared according to the present invention 2 Load capacity nano TiO 2 A graph of antibacterial effect of the fabric on staphylococcus aureus before and after finishing WTTSPU emulsion; in the figure, A is TiO-free 2 Of B is TiO 2 At a content of 0.1%, C is TiO 2 At a level of 0.2%, D is TiO 2 At a content of 0.3%, E is TiO 2 At a content of 0.4%, F is TiO 2 The content is 0.5%.
FIG. 4 shows different nano-TiO's prepared according to the present invention 2 Load capacity nano TiO 2 The UV resistance of the fabrics before and after finishing and before and after washing with the WSPU emulsion is shown in the figure, and the bar is UPF (before washing), UPF (after washing), UVA (before washing) and UVA (after washing) from left to right.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
Example 1
Weighing 3.9757g of dried polyethylene glycol (with the molecular weight of 1000) and 3.3791g of polytetrahydrofuran ether glycol, placing the polyethylene glycol and the polytetrahydrofuran ether glycol into a three-neck flask with a stirrer, dripping dibutyl tin dilaurate which is a catalyst with the mass of 0.02% of the polyether, heating to 120 ℃, and vacuumizing to remove water for 3 hours; after cooling to 80 ℃, releasing vacuum, adding nitrogen for protection, adding 3mL of butanone into a three-necked flask, and reacting with 5.3002g of isophorone diisocyanate (IPDI) for 1h; dropping catalyst with the mass of 0.03% of polyether into the reaction system, and continuing stirring to react for 1h to generate isocyanate-terminated prepolymer; 0.7182g of dimethylolpropionic acid and 0.9966g of 1, 4-butanediol are added to the prepolymer in sequence to chain extend the polyurethaneDuring the reaction, tetrabutyl titanate with the mass fraction of 0.1% of the prepolymer is respectively added, the temperature is reduced to 60 ℃ after the reaction is carried out for 2 hours, 1mL of triethylamine is added for continuous reaction for 0.5 hour, and then 81.4mL of distilled water is added for high-speed stirring for 0.2 hour, thus preparing the nano TiO with the solid content of 15 percent 2 Water-dispersible emulsion of WSPU. Then placing the mixture into a reduced pressure distillation device, wherein the distillation temperature is 80-85 ℃ and the distillation time is 0.5h. Coating the emulsion with a coater, sealing and freezing a part of coated glass plates in a box, freezing at-18 ℃ for 12h, taking out from a refrigerator, thawing for 4h at room temperature, repeating the freezing-thawing operation for 5 times, vacuum drying the polyurethane film at 30 ℃, and storing in a sealing bag; the other part is that the emulsion is evenly coated on the surface of polyester cloth by using a film coater in a scraping way, baked by a setting machine at 170 ℃ for 45s, cooled at room temperature, one part of the fabric is put into a soaping machine (soap flake 5g/L, bath ratio 1:50) for washing for 30min at 40 ℃, then washed twice in three-level water, namely, one water washing is completed, and the washed sample is hung in air at the temperature of not more than 60 ℃ for drying and storing.
Experimental results indicate that nano TiO will be used 2 Compared with the non-finished fabric, the fabric after finishing the WTAU emulsion has the advantages that the waterproof effect is improved by 2 grades, the moisture permeability mutation phenomenon is obvious in the temperature range of 25-38 ℃, the tensile strength is improved by 12.4%, the ultraviolet resistance is improved by 55.5%, and the antibacterial property is improved by 21%. Nano TiO prepared in this example 2 SEM image of WSPU film as shown in FIG. 1 (A), SEM image before finishing polyester fabric as shown in FIG. 1 (B), tiO was used 2 SEM images of the polyester fabrics after finishing with WTAU emulsion are shown in (C) of FIG. 1; the present embodiment uses TiO 2 The graph of the moisture permeability of the polyester fabric after finishing the WTAU emulsion is shown as a curve C in FIG. 2; the present embodiment uses TiO 2 The graph of the antibacterial effect of the polyester fabric after finishing the WTAU emulsion on the staphylococcus aureus is shown in (B) of fig. 3; the present embodiment uses TiO 2 The ultraviolet resistance effect graph of the polyester fabric after finishing the WTAU emulsion is shown as 0.1% bar in FIG. 4.
Example 2
Weighing 3.9757g of polyethylene glycol (molecular weight 600) and3.3791g of polytetrahydrofuran ether glycol is placed in a three-neck flask with a stirrer, dibutyl tin dilaurate which is a catalyst with the mass of 0.02% of that of the polyether is dripped, the temperature is raised to 120 ℃, and vacuum pumping and water removal are carried out for 3 hours; after cooling to 80 ℃, releasing vacuum, adding nitrogen for protection, adding 3mL of butanone into a three-necked flask, and reacting with 5.3002g of isophorone diisocyanate (IPDI) for 1h; dropping catalyst with the mass of 0.03% of polyether into the reaction system, and continuing stirring to react for 1h to generate isocyanate-terminated prepolymer; 0.7182g of dimethylolpropionic acid and 0.9966g of 1, 4-butanediol are sequentially added into the prepolymer, tetrabutyl titanate with the mass fraction of 0.4% of the prepolymer is respectively added when polyurethane is subjected to chain extension reaction, the temperature is reduced to 60 ℃ after 2 hours of reaction, 1mL of triethylamine is added for continuous reaction for 0.5 hour, 81.4mL of distilled water is added for high-speed stirring for 0.2 hour, and the nano TiO with the solid content of 15% is prepared 2 Water-dispersible emulsion of WSPU. Then placing the mixture into a reduced pressure distillation device, wherein the distillation temperature is 80-85 ℃ and the distillation time is 0.5h. The solvent-removed products are respectively coated by an applicator, and a part of the coated glass plates are put into a box for sealing and freezing. Freezing at-18deg.C for 12 hr, thawing at room temperature for 4 hr, and repeating the above freezing-thawing operation for 5 times. Vacuum drying polyurethane film at 30deg.C, and storing in sealed bag; the other part is that the emulsion is evenly coated on the surface of polyester cloth by using a film coater in a scraping way, baked by a setting machine at 170 ℃ for 45s, cooled at room temperature, one part of the fabric is put into a soaping machine (soap flake 5g/L, bath ratio 1:50) for washing for 30min at 40 ℃, then washed twice in three-level water, namely, one water washing is completed, and the washed sample is hung in air at the temperature of not more than 60 ℃ for drying and storing. Nano TiO will be used 2 Compared with the non-finished fabric, the fabric after finishing the WTAU emulsion has the waterproof effect improved by 2.5 grades, obviously has the moisture permeability mutation phenomenon in the temperature range of 25-38 ℃, improves the tensile strength by 20.8 percent, improves the ultraviolet resistance by 85.4 percent and improves the antibacterial property by 57.5 percent.
The fabric used in the above examples was 190T white pure polyester woven fabric; the thickness of the coating film is 110-125 mu m; nanometer TiO 2 Particle size is about 100 nm; the antibacterial test strain is staphylococcus aureus.

Claims (1)

1. The preparation method of the multifunctional water-based temperature-sensitive polyurethane finishing agent is characterized by comprising the following steps of:
(1) Drying polytetrahydrofuran ether glycol (PTMG), polyethylene glycol (PEG), dimethylolpropionic acid (DMPA) before use to remove water, and soaking 1, 4-Butanediol (BDO) and butanone in 4A molecular sieve for 5-8 days before use;
(2) Placing the dried polyethylene glycol and polytetrahydrofuran ether glycol, namely polyether, into a three-neck flask with a stirrer according to the mass ratio of 0.8-1.2:1, dripping dibutyl tin dilaurate which is a catalyst with the mass of 0.01-0.04% of that of the polyether, heating to 100-140 ℃, and vacuumizing to remove water for 2-5 hours; cooling to below 80 ℃, removing vacuum, adding nitrogen for protection, adding butanone with the mass of 80-90% of that of polyether and isophorone diisocyanate (IPDI) with the mass of 1.4-1.6 times of that of polyether into a three-mouth bottle, and reacting for 0.5-2 h; dropping catalyst accounting for 0.02-0.05% of the mass of polyether into the reaction system, and continuing stirring and reacting for 0.5-2 h to generate isocyanate-terminated prepolymer; sequentially adding dimethylolpropionic acid with the mass of 5% -7% of the prepolymer and 1, 4-butanediol with the mass of 5% -7% of the prepolymer into the prepolymer, when the reaction is carried out for 0.5-1 h, firstly adding tetrabutyl titanate with the mass fraction of 0.1% -0.5% of the prepolymer, cooling to below 60 ℃ after the reaction is carried out for 1-3 h, then adding triethylamine with the mass of 6% -8% of the prepolymer, continuously reacting for 0.3-1 h, and then adding distilled water with the mass of 3-5 times of the prepolymer, stirring for 0.1-0.5 h at high speed, thus obtaining the nano TiO with the mass of 15% -25% 2 Water-dispersible emulsion of WSPU;
(3) For the nano TiO obtained in the step (2) 2 Performing reduced pressure distillation on the WSPU water dispersion emulsion to obtain a polyurethane emulsion finishing agent;
wherein in step (1), the molecular weight of PTMG is 2000; the molecular weight of PEG is 600; in the step (1), the drying and dewatering are vacuum drying and dewatering, the dewatering temperature is 70-100 ℃, and the dewatering time is 6-10 h; in the step (3), the distillation temperature is 80-85 ℃ and the time is 0.2-1.2 h;
the polyurethane emulsion finishing agent is used for finishing polyester fabrics.
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