CN103739818A - Waterborne polyurethane-acrylic emulsion as well as preparation method and application thereof - Google Patents
Waterborne polyurethane-acrylic emulsion as well as preparation method and application thereof Download PDFInfo
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- 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
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- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
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- C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
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- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C08G18/40—High-molecular-weight compounds
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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Abstract
The invention provides waterborne polyurethane-acrylic emulsion as well as a preparation method and application thereof, belonging to the field of leather auxiliaries. The emulsion comprises 60-100 parts of polyether polyols, 40-80 parts of polyisocyanate monomers, 1-10 parts of polysiloxane, 30-60 parts of acrylic monomers, 5-10 parts of small molecule chain extenders and 5-12 parts of hydrophilic chain extenders by weight. The invention also provides the preparation method of the waterborne polyurethane-acrylic emulsion. The preparation method comprises the steps of stepwise polymerizing the polyisocyanate monomers, polyether polyols, hydrophilic chain extenders and organic silicon in proportion to prepare a prepolymer, synthesizing anionic waterborne polyurethane emulsion by a self-emulsification method, adding the acrylic monomers and continuing polymerization, thus preparing the dual-modified waterborne polyurethane emulsion. After a film is formed by coating the emulsion, the tensile strength is not less than 20MPa and the elongation is not less than 600%. The waterborne polyurethane-acrylic emulsion has good surface properties and excellent overall properties.
Description
Technical field
The invention belongs to leather agent field, be specifically related to a kind of water-borne polyurethane-acrylate emulsion and its preparation method and application.
Background technology
Leather aqurous ployurethane is filmogen indispensable in EFFECTS OF LEATHER FINISHING process.Waterborne polyurethane coating agent has been eliminated the inflammable and explosive danger in solvent borne polyurethane production, accumulating and use procedure, meet the requirement of safety and environmental protection, leather after covering with paint, lacquer, colour wash, etc. with polyaminoester emulsion, there is bright, plentiful, good hand touch, wear-resisting, the advantage such as easy fracture not, can greatly improve the grade of finished leather.But urethane also has its inherent defect, as poor water resistance, mechanical property is not enough, and starting material are relatively costly etc.And polyacrylic finishing agent mechanical property is good, transparent, good weatherability, water tolerance is excellent, but it there will be the defect of " hot sticky cold crisp " with temperature.Compound dual-component aqueous polyurethane combines urethane with the feature of polyacrylic ester, given finishing agent more excellent performance.
Publication number is the preparation method that CN101307130B discloses a kind of leather finish anion aqueous polyurethane disperse, and the method adopts the isocyanic ester that contains rigidity aromatic ring, and the glued membrane making easily turns to be yellow.Publication number is the preparation that CN102924683A discloses resistance to xanthochromia leather finish use polyurethane dispersions.But due to the shortcoming such as self water tolerance of urethane is bad and expensive, its over-all properties is not very good.Publication number is the preparation method that CN102408537A discloses a kind of use for synthetic leather polymerization of acrylic modified polyurethane emulsion, but it adopts polyacrylate emulsion and the simple blend of polyaminoester emulsion, during its film forming, easily produces and is separated.
Summary of the invention
The invention provides a kind of water-borne polyurethane-acrylate emulsion and its preparation method and application, this water-borne polyurethane-acrylate emulsion has better over-all properties.
First the present invention provides a kind of water-borne polyurethane-acrylate emulsion, according to parts by weight meter, comprising:
Preferably, described polyether glycol is selected from one or more in polyoxyethylene glycol, polytetrahydrofuran dibasic alcohol, Polyoxypropylene diol.
Preferably, described polyisocynate monomer is selected from one or more in isophorone diisocyanate (IPDI), six cyclohexyl dicyanates (HMDI) or hexamethylene diisocyanate (HDI).
Preferably, described polysiloxane is selected from hydroxy-end capped polysiloxane or amino-terminated polysiloxane one or both.
Preferably, described acrylic ester monomer is selected from one or more in methyl methacrylate, β-dimethyl-aminoethylmethacrylate, butyl methacrylate or butyl acrylate.
Preferably, described small molecule chain extender is selected from Isosorbide-5-Nitrae butyleneglycol, neopentyl glycol, ethylene glycol, 2-methyl isophthalic acid, one or more in ammediol.
Preferably, one or more in the dibasic alcohol that described hydrophilic chain extender is selected from dimethylol propionic acid, dimethylolpropionic acid or contains sulfonic acid structure.
The present invention also provides a kind of preparation method of water-borne polyurethane-acrylate emulsion, comprises as follows:
Step 1: add polyether glycol, polyisocynate monomer, polysiloxane, hydrophilic chain extender, small molecule chain extender and catalyzer in reaction vessel, react at 75～85 ℃ 4～6 hours, obtain prepolymer;
Step 2: temperature in reaction vessel is down to 55～65 ℃, then adds acrylic ester monomer, cool the temperature to 30～45 ℃, add neutralizing agent, react 5～10 minutes, at room temperature add deionized water and stirring, obtain polyaminoester emulsion;
Step 3: add initiator, emulsifying agent and acrylic ester monomer in reaction vessel, react at 70～85 ℃ 2～6 hours, obtain water-borne polyurethane-acrylate emulsion.
Preferably, described catalyzer is selected from one or more in dibutyl tin laurate, dimethylethanolamine, triethylene diamine.
The present invention also provides the application in leather field as finishing agent of a kind of water-borne polyurethane-acrylate emulsion.
Beneficial effect of the present invention
The invention provides a kind of water-borne polyurethane-acrylate emulsion, the structure of this water-borne polyurethane-acrylate emulsion, because hydrophilic radical has been introduced the group with negatively charged ion, can effectively realize the emulsification of urethane; Owing to adopting aliphatic isocyanates, be raw material, the emulsion of preparation has yellowing resistance and stable feature; On polyurethane molecular chain, introduce polysiloxane, improved surface property and the film-forming properties of emulsion; Meanwhile, the present invention adds acrylic ester monomer, uses on the one hand as solvent, need not add other organic solvent, participates on the other hand reaction, the aqueous polyurethane emulsion of the two modifications of preparation.
The present invention also provides a kind of preparation method of water-borne polyurethane-acrylate emulsion, the method is proportionally carried out progressively polymerization by isocyanate-monomer, polyether polyol, hydrophilic chain extender and organosilicon, prepare prepolymer, through self-emulsification, synthesize anion aqueous polyurethane emulsion, add acrylic ester monomer to continue polymerization, the aqueous polyurethane emulsion of the two modifications of preparation, this preparation method is simple, there is no adding of organic solvent, reduced organic solvent recovery process, environmental protection.
The present invention also provides the application in leather field as finishing agent of a kind of water-borne polyurethane-acrylate emulsion, this water-borne polyurethane-acrylate emulsion has homogeneous grain diameter, modest viscosity, the advantages such as surface tension is low, experimental result shows: cover with paint, lacquer, colour wash, etc. after film forming tensile strength >=20MPa, elongation >=600%, there is good surface property, excellent combination property.
Accompanying drawing explanation
Fig. 1 is the infrared spectrogram of a kind of water-borne polyurethane-acrylate emulsion of the embodiment of the present invention 1 preparation;
Fig. 2 is the electromicroscopic photograph of a kind of water-borne polyurethane-acrylate emulsion of this embodiment 1 preparation.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment, the preferred embodiments of the invention are described, but should be appreciated that these are described is the restriction for further illustrating the features and advantages of the present invention rather than patent of the present invention being required.
First the present invention provides a kind of water-borne polyurethane-acrylate emulsion, according to parts by weight meter, comprising:
60～100 parts of polyether glycols, 40～80 parts of polyisocynate monomers, 1～10 part of polysiloxane, 30～60 parts of acrylic ester monomers, 5～10 parts of small molecule chain extenders, 5～12 parts of hydrophilic chain extenders.Be preferably: 70～90 parts of polyether glycols, 50～70 parts of polyisocynate monomers, 3～6 parts of polysiloxane, 40～50 parts of acrylic ester monomers, 6～8 parts of small molecule chain extenders, 7～10 parts of hydrophilic chain extenders.
Polyether glycol of the present invention is preferably selected from one or more in polyoxyethylene glycol, polytetrahydrofuran dibasic alcohol, Polyoxypropylene diol, and the number-average molecular weight of described polyether glycol is preferably 1000～4000.
Polyisocynate monomer of the present invention is preferably aliphatic diisocyanate monomer, is more preferably selected from one or more in isophorone diisocyanate (IPDI), six cyclohexyl dicyanates (HMDI) or hexamethylene diisocyanate (HDI).The present invention is raw material owing to adopting aliphatic isocyanates, and the emulsion of preparation has yellowing resistance and stable feature.
Polysiloxane of the present invention is preferably selected from one or both in hydroxyl endblocked polydimethylsiloxane or amino-terminated polysiloxane, and the number-average molecular weight of described polysiloxane is preferably 500-2000.The present invention has introduced polysiloxane on polyurethane molecular chain, has improved surface property and the film-forming properties of emulsion, and the over-all properties of this emulsion is improved.
Acrylic ester monomer of the present invention is preferably selected from one or more in methyl methacrylate, β-dimethyl-aminoethylmethacrylate, butyl methacrylate or butyl acrylate, the mixture of methyl methacrylate and butyl acrylate more preferably, in described mixture, the mass ratio of methyl methacrylate and butyl acrylate is 1:1.The present invention uses raw material propylene esters of gallic acid monomer to have two aspect effects, uses on the one hand as solvent, need not add other organic solvent, has reduced organic solvent recovery process; As starting monomer, participate in reaction on the other hand, the aqueous polyurethane emulsion of the two modifications of preparation.
Small molecule chain extender of the present invention is preferably selected from Isosorbide-5-Nitrae butyleneglycol, neopentyl glycol, ethylene glycol, 2-methyl isophthalic acid, a kind of several in ammediol.In the dibasic alcohol that described hydrophilic chain extender is preferably selected from dimethylol propionic acid, dimethylolpropionic acid or contains sulfonic acid structure one or more, the described dibasic alcohol that contains sulfonic acid structure is preferably second diamino ethyl sulfonic acid sodium.
The present invention also provides a kind of preparation method of water-borne polyurethane-acrylate emulsion, comprises as follows:
Step 1: add polyether glycol, polyisocynate monomer, polysiloxane, hydrophilic chain extender, small molecule chain extender and catalyzer in reaction vessel, react at 75～85 ℃ 4～6 hours, obtain prepolymer;
Step 2: temperature in reaction vessel is down to 55～65 ℃, then adds a part of acrylic ester monomer, cool the temperature to 30～45 ℃, add neutralizing agent, react 5～10 minutes, at room temperature add deionized water and stirring, obtain polyaminoester emulsion;
Step 3: add initiator, emulsifying agent and remaining acrylic ester monomer in reaction vessel, react at 70～85 ℃ 2～6 hours, obtain water-borne polyurethane-acrylate emulsion.
Adding in reaction vessel after polyether glycol described in step 1 of the present invention, preferably under 110～120 ℃ of conditions, vacuumize dehydration 1～2 hour, and then add polysiloxane, hydrophilic chain extender, small molecule chain extender and catalyzer, temperature is warming up to 75～85 ℃, after above-mentioned mixed solution melting, add polyisocynate monomer, react 4～6 hours, extremely-nco value reaches theoretical value, obtains prepolymer; Described catalyzer is preferably selected from one or more in dibutyl tin laurate, dimethylethanolamine, triethylene diamine.Catalyzer is according to parts by weight meter, preferably 0.01～0.1 part.
Cooling the temperature to after 55～65 ℃ described in step 2 of the present invention, in reaction vessel, add a part of acrylic ester monomer, acrylic ester monomer is as thinner, replace traditional acetone, reduction system viscosity, the add-on of described acrylic ester monomer accounts for acrylic ester monomer in reaction process and adds 50% of total amount; And then cool the temperature to 30～45 ℃, and add in neutralizing agent and salify, described neutralizing agent is preferably selected from one or more in triethylamine, tripropyl amine or 2-Mono Methyl Ethanol Amine.The add-on of neutralizing agent be in monomer carboxyl consumption 80%～120%; Described stir after adding deionized water, stirring velocity is preferably at 1000～2000 revs/min, and churning time is preferably 20～40 minutes.
Described in step 3 of the present invention, first reaction vessel temperature is warming up to 70～75 ℃, then add a part of initiator, emulsifying agent and remaining acrylic ester monomer, insulation reaction 1～3 hour, the add-on of described a part of initiator is 50～80% of initiator total amount, then temperature is warming up to 80～85 ℃, then adds remaining initiator, continue reaction 1～3 hour, cooling discharge, obtains water-borne polyurethane-acrylate emulsion.
Initiator of the present invention is preferably selected from Potassium Persulphate, ammonium persulphate, oil soluble AIBN or BPO a kind of.Total add-on of initiator is 0.5～3% of propionic acid esters of gallic acid monomer weight, is preferably 1%.
Emulsifying agent of the present invention is preferably selected from a kind of in Sodium dodecylbenzene sulfonate (SDS), sodium lauryl sulphate or alkyl sodium sulfonate.The add-on of emulsifying agent is propionic acid esters of gallic acid monomer weight 0.3～2%, is preferably 1%.The add-on of remaining acrylic ester monomer is to account for acrylic ester monomer in reaction process to add 50～60% of total amount.
The present invention also provides the application in leather field as finishing agent of a kind of water-borne polyurethane-acrylate emulsion.
Below in conjunction with embodiment, the present invention is done to further detailed description.
Embodiment 1
Whipping appts is being housed, condenser, in the there-necked flask of thermometer, add polytetrahydrofuran dibasic alcohol (data molecular weight is 4000) 100g, at the temperature of 120 ℃, vacuumize dehydration 1 hour, then add hydrophilic chain extender dimethylol propionic acid 12g, chainextender 1, 4-butyleneglycol 10g, hydroxyl endblocked polydimethylsiloxane (data molecular weight is 2000) 10g and catalyzer dibutyl tin laurate 0.1g, under drying nitrogen protection, temperature is controlled at 85 ℃, the disposable isophorone diisocyanate 80g that adds after above-mentioned mixed solution melting, react 4 hours extremely-nco values and reach theoretical value, obtain prepolymer,
Temperature in there-necked flask is down to 60 ℃, then add 30g methyl methacrylate and butyl acrylate mixture to dilute (mass ratio is 1:1), cool the temperature to 40 ℃, add 4g triethylamine, reaction 5min, at room temperature add deionized water, under the rotating speed of 1300 revs/min, dispersed with stirring is carried out emulsification in 30 minutes, obtains polyaminoester emulsion;
Temperature in there-necked flask is warming up to 75 ℃, add emulsifying agent SDS1.2g, initiator potassium persulfate 1.4g, with remaining methyl methacrylate and butyl acrylate mixture 30g(mass ratio be 1:1), insulation reaction 2 hours, is warming up to 80 ℃ by temperature, adds Potassium Persulphate 0.4g, continue reaction 2 hours, obtain polyurethane-acrylate emulsion.The polyurethane-acrylate emulsion obtaining is carried out to performance test, and result is as shown in table 1.
Fig. 1 is the infrared spectrogram of a kind of water-borne polyurethane-acrylate emulsion of the embodiment of the present invention 1 preparation, and as can be seen from the figure, the present invention has successfully prepared polyurethane-acrylate emulsion.
Fig. 2 is the electromicroscopic photograph of a kind of water-borne polyurethane-acrylate emulsion of this embodiment 1 preparation.As can be seen from Figure 2, emulsion particle distributes compared with homogeneous, and particle diameter is in rational scope.
Embodiment 2
Whipping appts is being housed, condenser, in the there-necked flask of thermometer, add polyoxyethylene glycol (data molecular weight is 1000) 60g, at the temperature of 120 ℃, vacuumize dehydration 1 hour, then add hydrophilic chain extender dimethylolpropionic acid 5g, chainextender neopentyl glycol 5g, hydroxyl endblocked polydimethylsiloxane (data molecular weight is 500) 1g and catalyzer dimethylethanolamine 0.01g, under drying nitrogen protection, temperature is controlled at 75 ℃, the disposable six cyclohexyl dicyanate 40g that add after above-mentioned mixed solution melting, react 6 hours extremely-nco values and reach theoretical value, obtain prepolymer,
By greenhouse cooling to 55 ℃ in there-necked flask, then add 15g β-dimethyl-aminoethylmethacrylate, cool the temperature to 30 ℃, add in 5g tripropyl amine and salify, reaction 10min, at room temperature add deionized water, under the rotating speed of 1300 revs/min, dispersed with stirring is carried out emulsification in 30 minutes, obtains polyaminoester emulsion;
Temperature in there-necked flask is warming up to 70 ℃, add emulsifier sodium lauryl sulfate 0.09g, initiator ammonium persulfate 0.1g, with remaining β-dimethyl-aminoethylmethacrylate 15g, insulation reaction 3 hours, is warming up to 80 ℃ by temperature, adds ammonium persulphate 0.05g, continue reaction 3 hours, obtain water-borne polyurethane-acrylate emulsion.The polyurethane-acrylate emulsion obtaining is carried out to performance test, and result is as shown in table 1.
Embodiment 3
Whipping appts is being housed, condenser, in the there-necked flask of thermometer, add Polyoxypropylene diol (data molecular weight is 2000) 70g, at the temperature of 120 ℃, vacuumize dehydration 1 hour, then add hydrophilic chain extender dimethylol propionic acid 7g, glycol chain extender 6g, amino-terminated polysiloxane (data molecular weight is 1000) 3g and catalyzer triethylene diamine 0.02g, under drying nitrogen protection, temperature is controlled at 80 ℃, the disposable hexamethylene diisocyanate 50g that adds after above-mentioned mixed solution melting, react 5 hours extremely-nco values and reach theoretical value, obtain prepolymer,
By greenhouse cooling to 65 ℃ in there-necked flask, then add 20g butyl methacrylate, cool the temperature to 45 ℃, add in 6g2-Mono Methyl Ethanol Amine and salify, reaction 7min, at room temperature add deionized water, under the rotating speed of 1300 revs/min, dispersed with stirring is carried out emulsification in 30 minutes, obtains polyaminoester emulsion;
Temperature in there-necked flask is warming up to 75 ℃, add emulsifying agent alkyl sodium sulfonate 0.4g, 0.2g initiator oil soluble AIBN, with remaining butyl methacrylate 20g, insulation reaction 1 hour, is warming up to 85 ℃ by temperature, adds oil soluble AIBN0.2g, continue reaction 1 hour, obtain water-borne polyurethane-acrylate emulsion.The polyurethane-acrylate emulsion obtaining is carried out to performance test, and result is as shown in table 1.
Embodiment 4
Whipping appts is being housed, condenser, in the there-necked flask of thermometer, add PTMG (data molecular weight is 2000) 90g, at the temperature of 120 ℃, vacuumize dehydration 1 hour, then add hydrophilic chain extender dimethylol propionic acid 10g, chainextender 1, 4-butyleneglycol 8g, hydroxyl endblocked polydimethylsiloxane (data molecular weight is 2000) 6g and catalyzer dibutyl tin laurate 0.05g, under drying nitrogen protection, temperature is controlled at 85 ℃, the disposable isophorone diisocyanate 70g that adds after above-mentioned mixed solution melting, react 4 hours extremely-nco values and reach theoretical value, obtain prepolymer,
Temperature in there-necked flask is down to 60 ℃, then add 25g methyl methacrylate and butyl acrylate mixture to dilute (mass ratio is 1:1), cool the temperature to 40 ℃, add in 5g triethylamine and salify, reaction 5min, at room temperature add deionized water, under the rotating speed of 1300 revs/min, dispersed with stirring is carried out emulsification in 30 minutes, obtains polyaminoester emulsion;
Temperature in there-necked flask is warming up to 75 ℃, add emulsifying agent SDS0.5g, and add initiator B PO0.3g, with remaining methyl methacrylate and butyl acrylate mixture 25g(mass ratio be 1:1), insulation reaction 2 hours, is warming up to 80 ℃ by above-mentioned emulsion, adds BPO0.2g, continue reaction 2 hours, obtain water-borne polyurethane-acrylate emulsion.The polyurethane-acrylate emulsion obtaining is carried out to performance test, and result is as shown in table 1.
Table 1
The explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a water-borne polyurethane-acrylate emulsion, is characterized in that, according to parts by weight meter, comprising:
2. a kind of water-borne polyurethane-acrylate emulsion according to claim 1, is characterized in that, described polyether glycol is selected from one or more in polyoxyethylene glycol, polytetrahydrofuran dibasic alcohol, Polyoxypropylene diol.
3. a kind of water-borne polyurethane-acrylate emulsion according to claim 1, is characterized in that, described polyisocynate monomer is selected from one or more in isophorone diisocyanate, six cyclohexyl dicyanates or hexamethylene diisocyanate.
4. a kind of water-borne polyurethane-acrylate emulsion according to claim 1, is characterized in that, described polysiloxane is selected from one or both in hydroxy-end capped polysiloxane or amino-terminated polysiloxane.
5. a kind of water-borne polyurethane-acrylate emulsion according to claim 1, is characterized in that, described acrylic ester monomer is selected from one or more in methyl methacrylate, β-dimethyl-aminoethylmethacrylate, butyl methacrylate or butyl acrylate.
6. a kind of water-borne polyurethane-acrylate emulsion according to claim 1, is characterized in that, described small molecule chain extender is selected from Isosorbide-5-Nitrae butyleneglycol, neopentyl glycol, ethylene glycol, 2-methyl isophthalic acid, one or more in ammediol.
7. a kind of water-borne polyurethane-acrylate emulsion according to claim 1, is characterized in that, in the dibasic alcohol that described hydrophilic chain extender is selected from dimethylol propionic acid, dimethylolpropionic acid or contains sulfonic acid structure one or more.
8. a preparation method for water-borne polyurethane-acrylate emulsion, is characterized in that, comprises as follows:
Step 1: add polyether glycol, polyisocynate monomer, polysiloxane, hydrophilic chain extender, small molecule chain extender and catalyzer in reaction vessel, react at 75～85 ℃ 4～6 hours, obtain prepolymer;
Step 2: temperature in reaction vessel is down to 55～65 ℃, then adds acrylic ester monomer, cool the temperature to 30～45 ℃, add neutralizing agent, react 5～10 minutes, at room temperature add deionized water and stirring, obtain polyaminoester emulsion;
Step 3: add initiator, emulsifying agent and acrylic ester monomer in reaction vessel, react at 70～85 ℃ 2～6 hours, obtain water-borne polyurethane-acrylate emulsion.
9. the preparation method of a kind of water-borne polyurethane-acrylate emulsion according to claim 8, is characterized in that, described catalyzer is selected from one or more in dibutyl tin laurate, dimethylethanolamine, triethylene diamine.
10. a kind of water-borne polyurethane-acrylate emulsion application in leather field as finishing agent described in any one in claim 1-9.
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