CN116041713A - Triblock fluorine-silicon synergistic modified waterborne polyurethane-acrylate emulsion and preparation method thereof - Google Patents

Triblock fluorine-silicon synergistic modified waterborne polyurethane-acrylate emulsion and preparation method thereof Download PDF

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CN116041713A
CN116041713A CN202211649424.1A CN202211649424A CN116041713A CN 116041713 A CN116041713 A CN 116041713A CN 202211649424 A CN202211649424 A CN 202211649424A CN 116041713 A CN116041713 A CN 116041713A
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polyurethane
triblock
acrylate
acrylic ester
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王玲玲
曾国屏
韩飞
王刚
章芬
陈伟
胡银
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Institute of Applied Chemistry Jiangxi Academy of Sciences
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    • C08G81/00Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
    • C08G81/02Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C08G81/024Block or graft polymers containing sequences of polymers of C08C or C08F and of polymers of C08G

Abstract

The invention discloses a triblock fluorosilicone acrylic ester modified polyurethane emulsion and a preparation method thereof, wherein the method utilizes double-end vinyl siloxane modified polyacrylate and fluorine-containing acrylic ester to cooperatively modify polyurethane, and adopts a segmented polymerization method to prepare aqueous polyurethane-acrylic ester emulsion with a triblock structure; the middle of the obtained product is polyurethane, one end of the polyurethane is connected with an organosilicon modified polyacrylate segment, and the other end of the polyurethane is connected with an organofluorine modified polyacrylate segment. According to the invention, the acrylic ester chain segment is introduced, and simultaneously, the organic fluorine and organic silicon groups are introduced, so that the hardness, corrosion resistance, light resistance and yellowing resistance of the aqueous polyurethane emulsion are improved, and the high temperature resistance, stain resistance, solvent resistance and water resistance of the traditional WPUA are greatly improved.

Description

Triblock fluorine-silicon synergistic modified waterborne polyurethane-acrylate emulsion and preparation method thereof
Technical Field
The invention belongs to the field of water-based paint, and particularly relates to a triblock fluorine-silicon synergistic modified water-based polyurethane-acrylate emulsion and a preparation method thereof.
Background
The water-based polyurethane acrylate (WPUA) has the advantages of polyurethane and polyacrylate at the same time. Polyacrylate has the advantages of high hardness, corrosion resistance, light resistance, low production cost, yellowing resistance and the like, and excellent wear resistance, weather resistance and elasticity are excellent properties possessed by polyurethane, so that WPUA is widely used in various industries of people living and industrial production. However, WPUA introduces a certain number of hydrophilic groups or atoms or groups with strong hydrophilic ability on the molecular structure, so that the WPUA has poor hydrophobic and oleophobic ability, solvent erosion resistance and mechanical properties. The organic siloxane and organic fluorine groups are introduced into polyurethane acrylic acid dispersoid, and the chemical modification effect of the organic siloxane and the organic fluorine groups on polyurethane acrylic ester polymer is achieved by utilizing the synergistic effect of the organic siloxane and the organic fluorine groups, so that the modified resin has special functions of high temperature resistance, stain resistance, solvent resistance, water resistance and the like, can be applied to water-based woodware, glass paint and metal, can completely reach the standard and the requirement of the same type of solvent type polyurethane coating on the construction performance and the paint film performance, can replace the similar solvent type polyurethane coating, has the characteristics of environmental protection and safety, and meets the development requirement of environmental protection of the current coating.
Disclosure of Invention
The invention aims to provide a preparation method of a fluorosilicone synergistic modified waterborne polyurethane-acrylate emulsion, which is used for preparing a triblock waterborne polyurethane-acrylate emulsion by synergistic modification of polyacrylate and fluorine-containing acrylate modified by double-end vinyl siloxane so as to improve the hydrophobic and oleophobic capacity, the solvent erosion resistance and the mechanical property of a common waterborne polyurethane-acrylate system.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a triblock fluorosilicone acrylate modified polyurethane emulsion is prepared from polyurethane, wherein one end of the polyurethane is connected with an organosilicon modified polyacrylate segment, and the other end of the polyurethane is connected with an organofluorine modified polyacrylate segment.
A preparation method of triblock fluorosilicone acrylate modified polyurethane emulsion comprises the following steps:
preparation of organosilicon modified waterborne polyurethane-acrylic ester: mixing 5-20 parts of vinyl-terminated siloxane, 10-30 parts of acrylate monomer, 3-7 parts of solvent, 1-3 parts of emulsifier, 1-3 parts of surfactant, 1-3 parts of cross-linking agent and 100-300 parts of deionized water, and performing ultrasonic emulsification for 30-50 min to obtain pre-emulsion; adding a part of pre-emulsion into a reaction container, stirring and heating to 60-85 ℃ and adding 0.1-0.3 part of initiator, continuously stirring until the emulsion is blue light and the temperature is stable, continuously dripping the rest of pre-emulsion and 0.2-0.6 part of initiator, continuously dripping 100-200 parts of aqueous polyurethane prepolymer and 0.5-1.5 part of initiator after heat preservation reaction for 1-3 hours, and performing heat preservation reaction for 1-3 hours to obtain diblock organosilicon modified aqueous polyurethane-acrylate emulsion;
preparation of triblock fluorosilicone modified waterborne polyurethane-acrylic ester: 10-25 parts of fluorine-containing acrylic ester and 10-50 parts of other acrylic ester monomers are mixed to obtain monomer mixed solution; and continuously dropwise adding 0.3-1.5 parts of monomer mixed solution and initiator into the organosilicon modified waterborne polyurethane-acrylic ester system, keeping the temperature after the dropwise adding is completed for 1-2 hours, completely reacting, naturally cooling, and regulating the pH value to be neutral by ammonia water to obtain the triblock fluorine-silicon modified waterborne polyurethane-acrylic ester.
Further preferably, the vinyl-terminated siloxane is any one of vinyl-terminated dimethylpolysiloxane, 1, 3-divinyl tetramethyldisiloxane, 2,4, 6-trivinyl-2, 4, 6-trimethylcyclotrisiloxane, 2,4,6, 8-tetramethyl-2, 4,6, 8-tetravinyl cyclotrisiloxane.
More preferably, the fluorinated acrylate is any one of perfluoroalkyl ethyl acrylate, tridecyl methacrylate, tridecyl acrylate, hexafluorobutyl methacrylate, hexafluorobutyl acrylate, dodecafluoro heptyl methacrylate, dodecafluoro heptyl acrylate, ethyl trifluoromethyl acrylate, and ethyl trifluoroacrylate.
Further preferably, the acrylic acid ester monomer is any one of butyl acrylate, methyl methacrylate, and isobutyl methacrylate.
Further preferably, the solvent is n-hexane or n-hexadecane.
Further preferably, the emulsifier is any one of sodium dodecyl benzene sulfonate, ammonium dodecyl sulfate and sodium hexadecyl benzene sulfonate
Further preferably, the surfactant is any one of polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene alkyl allyl ether, and octylphenol polyoxyethylene.
Further preferably, the cross-linking agent is any one of N-methylolacrylamide, acid diacyl well and zinc o-methoxybenzoate
Further preferably, the initiator is any one of ammonium persulfate, sodium persulfate and potassium persulfate.
Further preferably, the preparation process of the aqueous polyurethane prepolymer comprises the following steps: 5-20 parts of oligomer polyol and 7-25 parts of polyisocyanate are added into a reaction vessel, and the temperature is raised to 70-90 ℃ under the protection of nitrogen. Detecting the NCO content in the system after 3-5 hours of reaction; when the NCO content reaches the theoretical value, the temperature is reduced to 50-60 ℃, 0.5-2 parts of hydrophilic chain extender and 0.2-0.5 part of polyol are added, then the mixture is stirred and heated to 60-85 ℃, and 0.5-2 parts of catalyst and 7-12 parts of acetone or butanone are added dropwise to adjust the viscosity of the prepolymer. Cooling to room temperature after reacting for 1-3 h, adding 0.5-2 parts of triethylamine for neutralization reaction for 15min, adding 10-20 parts of deionized water, emulsifying for 15-30 min by high-speed shearing, and distilling under reduced pressure to remove the solvent, thus obtaining the waterborne polyurethane prepolymer.
Further preferably, the oligomer polyol is any one of polypropylene glycol, polycaprolactone diol, polycarbonate diol, and polytetrahydrofuran ether diol.
Further preferably, the polyisocyanate is any one of 2, 4-toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate.
Further preferably, the hydrophilic chain extender is any one of dimethylolpropionic acid and diaminobenzoic acid.
Further preferably, the polyol is any one of 1, 4-butanediol, ethylene glycol, diethylene glycol and hexanediol.
Further preferably, the catalyst is any one of dibutyl tin dilaurate, stannous octoate and methyl diethanolamine.
The beneficial effects of the invention are as follows: the preparation method comprises the steps of preparing aqueous polyurethane-acrylic ester emulsion with a triblock structure by utilizing double-end vinyl siloxane modified polyacrylate and fluorine-containing acrylic ester to synergistically modify polyurethane for the first time and adopting a segmented polymerization method. Introducing organic fluorine and organic silicon groups at the same time of introducing polyacrylate chain segments. Not only is the polyacrylate segment beneficial to improving the hardness, corrosion resistance, light resistance and yellowing resistance of the aqueous polyurethane emulsion, but also the organic fluorine silicon group greatly improves the high temperature resistance, stain resistance, solvent resistance, water resistance and the like of the traditional WPUA. The structure and the composition of the organic silicon modified acrylic ester-polyurethane-organic fluorine modified acrylic ester triblock are regulated, so that the performance advantages of polyurethane and polyacrylate can be retained to the maximum extent, the compatibility and emulsion stability between an organic fluorine silicon group and a polyurethane chain segment can be improved, and the formation of the fluorine silicon modified WPUA emulsion with excellent and stable performance is facilitated.
Drawings
FIG. 1 is a flow chart of a preparation process of triblock fluorine-silicon synergistic modified waterborne polyurethane-acrylic ester.
FIG. 2 is a block diagram of a three-block fluorosilicone synergistic modified waterborne polyurethane-acrylate.
In the figure: 100-polyurethane, 200-organosilicon modified polyacrylate segment, 300-organofluorine modified polyacrylate segment
Detailed Description
The present invention will be described in further detail with reference to fig. 1 and examples, but the experimental embodiment is not limited thereto.
The parts mentioned in the following examples of the present invention are all parts by mass.
Example 1
Step 1: 10 parts of polypropylene glycol and 12 parts of 2, 4-toluene diisocyanate are added into a reaction vessel, and the temperature is raised to 80 ℃ under the protection of nitrogen; detecting the NCO content in the system after 3 hours of reaction; when the NCO content reaches the theoretical value (namely, the polypropylene glycol is completely reacted), the temperature is reduced to 50 ℃,1 part of dimethylolpropionic acid and 0.3 part of 1, 4-butanediol are added, then the mixture is stirred and heated to 80 ℃, and 1.5 parts of dibutyltin dilaurate and 8 parts of acetone are added dropwise to adjust the viscosity of the prepolymer. Cooling to room temperature after reacting for 3 hours, adding 1.5 parts of triethylamine for neutralization reaction for 15 minutes, adding 15 parts of deionized water, and carrying out high-speed shearing emulsification for 20 minutes and reduced pressure distillation to remove a solvent to obtain the waterborne polyurethane prepolymer WPU.
Step 2: 10 parts of vinyl-terminated dimethylpolysiloxane, 10 parts of butyl acrylate, 10 parts of methyl methacrylate, 5 parts of N-hexane, 1 part of sodium dodecyl benzene sulfonate, 1 part of polyoxyethylene alkyl ether, 1 part of N-methylolacrylamide and 100 parts of deionized water are mixed, and the mixture is subjected to ultrasonic emulsification for 30 minutes to obtain a pre-emulsion. Adding 1/3 of the pre-emulsion into a reaction vessel, stirring and heating to 80 ℃, adding 0.1 part of potassium persulfate, continuously stirring until the emulsion is blue light and the temperature is stable, continuously dripping the rest 2/3 of the pre-emulsion and 0.2 part of potassium persulfate within 2 hours, continuously dripping 100 parts of WPU prepolymer and 0.5 part of initiator after heat preservation reaction for 1 hour, and performing heat preservation reaction for 2 hours to obtain the diblock organosilicon modified waterborne polyurethane-acrylic ester emulsion.
Step 3: 10 parts of perfluoroalkyl ethyl acrylate, 10 parts of butyl acrylate and 10 parts of methyl methacrylate are mixed to obtain a monomer mixed solution; and (3) continuously dropwise adding 0.2 part of monomer mixed solution and potassium persulfate into the diblock organosilicon modified waterborne polyurethane-acrylic ester system obtained in the second step, carrying out heat preservation reaction for 1h after the dropwise adding is finished within 2h, naturally cooling, and regulating the pH value to be neutral by ammonia water to obtain the triblock fluorosilicone modified waterborne polyurethane-acrylic ester.
Example 2
Step 1: 7 parts of polycarbonate diol and 10 parts of isophorone diisocyanate were added to a reaction vessel, and the temperature was raised to 85℃under nitrogen protection. Detecting the NCO content in the system after 3.5 hours of reaction; when the NCO content reaches the theoretical value (namely the polycarbonate diol is completely reacted), the temperature is reduced to 50 ℃,2 parts of dimethylolpropionic acid and 0.2 part of ethylene glycol are added, then the mixture is stirred and heated to 85 ℃, and 2 parts of dibutyltin dilaurate and 10 parts of acetone are added dropwise to adjust the viscosity of the prepolymer. Cooling to room temperature after reacting for 3 hours, adding 2 parts of triethylamine for neutralization reaction for 15 minutes, adding 15 parts of deionized water, and removing the solvent through high-speed shearing and emulsification for 20 minutes and reduced pressure distillation to obtain the waterborne polyurethane prepolymer WPU.
Step 2: 15 parts of vinyl-terminated dimethylpolysiloxane, 5 parts of butyl acrylate, 10 parts of methyl methacrylate, 5 parts of N-hexane, 1 part of sodium dodecyl benzene sulfonate, 1 part of polyoxyethylene alkyl ether, 1 part of N-methylolacrylamide and 80 parts of deionized water are mixed, and the mixture is subjected to ultrasonic emulsification for 40 minutes to obtain a pre-emulsion. Adding 1/3 of the pre-emulsion into a reaction vessel, stirring and heating to 85 ℃, adding 0.15 part of potassium persulfate, continuously stirring until the emulsion is blue light and the temperature is stable, continuously dripping the rest 2/3 of the pre-emulsion and 0.3 part of potassium persulfate within 2 hours, continuously dripping 120 parts of WPU prepolymer and 0.9 part of initiator after heat preservation reaction for 1 hour, and carrying out heat preservation reaction for 3 hours to obtain the diblock organosilicon modified waterborne polyurethane-acrylic ester emulsion.
Step 3: 15 parts of tridecafluorooctyl methacrylate and 20 parts of butyl acrylate and 10 parts of isobutyl methacrylate are mixed to obtain a monomer mixed solution; and (3) continuously dropwise adding 0.3 part of monomer mixed solution and 0.3 part of potassium persulfate into the diblock organosilicon modified waterborne polyurethane-acrylic ester system obtained in the second step, carrying out heat preservation reaction for 1.5 hours after dropwise adding is completed, naturally cooling, and regulating the pH value to be neutral by ammonia water to obtain the triblock fluorosilicone modified waterborne polyurethane-acrylic ester.
Example 3
Step 1: 10 parts of polytetrahydrofuran ether glycol and 13 parts of isophorone diisocyanate are added into a reaction vessel, and the temperature is raised to 85 ℃ under the protection of nitrogen. Detecting the NCO content in the system after 3 hours of reaction; when the NCO content reaches the theoretical value (namely, the polytetrahydrofuran ether dihydric alcohol is completely reacted), the temperature is reduced to 50 ℃,2 parts of diaminobenzoic acid and 0.5 part of diethylene glycol are added, then the mixture is stirred and heated to 70 ℃, and 2 parts of stannous octoate and 10 parts of acetone are added dropwise to adjust the viscosity of the prepolymer. Cooling to room temperature after reacting for 3 hours, adding 2 parts of triethylamine for neutralization reaction for 15 minutes, adding 20 parts of deionized water, and removing the solvent through high-speed shearing and emulsification for 30 minutes and reduced pressure distillation to obtain the waterborne polyurethane prepolymer WPU.
Step 2: 10 parts of 1, 3-divinyl tetramethyl disiloxane, 10 parts of butyl acrylate, 5 parts of isobutyl methacrylate, 7 parts of n-hexadecane, 2 parts of sodium hexadecyl benzene sulfonate, 1 part of polyoxyethylene alkylphenyl ether, 1 part of zinc o-methoxybenzoate and 120 parts of deionized water are mixed, and the mixture is subjected to ultrasonic emulsification for 50 minutes to obtain a pre-emulsion. Adding 1/3 of the pre-emulsion into a reaction vessel, stirring and heating to 85 ℃, adding 0.2 part of ammonium persulfate, continuously stirring until the emulsion is blue light and the temperature is stable, continuously dripping the rest 2/3 of the pre-emulsion and 0.4 part of ammonium persulfate in 2h, continuously dripping 200 parts of WPU (polyurethane-polyurethane) prepolymer and 1.2 parts of an initiator after heat preservation reaction for 1h, and performing heat preservation reaction for 3h to obtain the diblock organosilicon modified waterborne polyurethane-acrylate emulsion.
Step 3: 20 parts of hexafluorobutyl acrylate and 10 parts of butyl acrylate and 30 parts of methyl methacrylate are mixed to obtain a monomer mixed solution; and (3) continuously dropwise adding 0.6 part of monomer mixed solution and ammonium persulfate into the diblock organosilicon modified waterborne polyurethane-acrylic ester system obtained in the second step, carrying out heat preservation reaction for 1h after the dropwise adding is finished within 2h, naturally cooling, and regulating the pH value to be neutral by ammonia water to obtain the triblock fluorosilicone modified waterborne polyurethane-acrylic ester.
As shown in FIG. 2, the three-block fluorosilicone acrylate modified polyurethane emulsion is polyurethane 100 in the middle, one end of the polyurethane 100 is connected with an organosilicon modified polyacrylate segment 200, and the other end of the polyurethane 100 is connected with an organofluorine modified polyacrylate segment 300.
Comparative example 1
The other steps are the same as in example 1 except that no vinyl-terminated dimethylpolysiloxane is added in step 2 and no perfluoroalkyl ethyl acrylate is added in step 3.
Comparative example 2
The other steps are the same as in example 2 except that no vinyl-terminated dimethylpolysiloxane is added in step 2 and tridecafluorooctyl methacrylate is not added in step 3.
Comparative example 3
The other steps are the same as in example 3, except that no terminal 1, 3-divinyl tetramethyl disiloxane is added in step 2 and no hexafluorobutyl acrylate is added in step 3.
TABLE 1 test results of the three-block fluorosilicone modified waterborne polyurethane-acrylate coatings of the invention
Figure BDA0004009703480000071
As can be seen from the above table, the present invention utilizes a co-modified polyurethane of a double-ended vinyl siloxane modified polyacrylate and a fluoroacrylate. Under the action of an initiator, through the segmented polymerization reaction of the polyurethane prepolymer and acrylic ester, an organosilicon modified polyacrylate segment and an organofluorine modified polyacrylate segment are respectively introduced at two ends of the polyurethane. Because the organic fluorine silicon modified polyacrylate chain segment and the polyurethane chain segment have better compatibility, the problem of poor compatibility caused by directly introducing the organic fluorine silicon group is avoided, and the obtained emulsion has good storage stability and freeze thawing stability. Meanwhile, due to the introduction of organosilicon and organic fluorine groups, a large number of C-F, si-O bonds exist in a molecular chain, so that the hydrophobicity, the water resistance and the mechanical property of the coating can be effectively improved.
The embodiments of the invention are not limited to the examples described above, but all modifications and variants based on the description described above fall within the scope of protection of the appended claims, without being limited to specific details.

Claims (11)

1. A triblock fluorosilicone acrylate modified polyurethane emulsion is characterized in that polyurethane is arranged in the middle, one end of the polyurethane is connected with an organosilicon modified polyacrylate segment, and the other end of the polyurethane is connected with an organofluorine modified polyacrylate segment.
2. A preparation method of triblock fluorosilicone acrylate modified polyurethane emulsion is characterized by comprising the following steps:
preparation of organosilicon modified waterborne polyurethane-acrylic ester: mixing 5-20 parts of vinyl-terminated siloxane, 10-30 parts of acrylate monomer, 3-7 parts of solvent, 1-3 parts of emulsifier, 1-3 parts of surfactant, 1-3 parts of cross-linking agent and 100-300 parts of deionized water, and performing ultrasonic emulsification for 30-50 min to obtain pre-emulsion; adding a part of pre-emulsion into a reaction container, stirring and heating to 60-85 ℃, adding 0.1-0.3 part of initiator, continuously stirring until the emulsion is blue light and the temperature is stable, continuously dripping the rest of pre-emulsion and 0.2-0.6 part of initiator, carrying out heat preservation reaction for 1-3 hours, continuously dripping 100-200 parts of aqueous polyurethane prepolymer and 0.5-1.5 part of initiator, and carrying out heat preservation reaction for 1-3 hours to obtain diblock organosilicon modified aqueous polyurethane-acrylate emulsion;
preparation of triblock fluorosilicone modified waterborne polyurethane-acrylic ester: 10-25 parts of fluorine-containing acrylic ester and 10-50 parts of other acrylic ester monomers are mixed to obtain monomer mixed solution; and continuously dropwise adding 0.3-1.5 parts of monomer mixed solution and initiator into the organosilicon modified waterborne polyurethane-acrylic ester system, keeping the temperature after the dropwise adding is completed for 1-2 hours, performing complete reaction, naturally cooling, and regulating the pH value to be neutral by ammonia water to obtain the triblock fluorine-silicon modified waterborne polyurethane-acrylic ester.
3. The method for preparing the triblock fluorosilicone acrylate modified polyurethane emulsion according to claim 2, wherein the vinyl-terminated siloxane is any one of vinyl-terminated dimethylpolysiloxane, 1, 3-divinyl tetramethyl disiloxane, 2,4, 6-trivinyl-2, 4, 6-trimethyl cyclotrisiloxane and 2,4,6, 8-tetramethyl-2, 4,6, 8-tetravinyl cyclotrisiloxane.
4. The method for preparing the triblock fluorosilicone acrylate modified polyurethane emulsion according to claim 2, wherein the fluorinated acrylate is any one of perfluoroalkyl ethyl acrylate, tridecyl fluorooctyl methacrylate, tridecyl fluorooctyl acrylate, hexafluorobutyl methacrylate, hexafluorobutyl acrylate, dodecafluoroheptyl methacrylate, dodecafluoroheptyl acrylate, ethyl trifluormethacrylate and ethyl trifluoracetate.
5. The method for preparing the triblock fluorosilicone acrylate modified polyurethane emulsion according to claim 2, wherein the acrylate monomer is any one of butyl acrylate, methyl methacrylate and isobutyl methacrylate.
6. The method for preparing the triblock fluorosilicone acrylate modified polyurethane emulsion according to claim 2, wherein the solvent is n-hexane or n-hexadecane.
7. The method for preparing the triblock fluorosilicone acrylate modified polyurethane emulsion according to claim 2, wherein the emulsifier is any one of sodium dodecyl benzene sulfonate, ammonium dodecyl sulfate and sodium hexadecyl benzene sulfonate.
8. The method for preparing the triblock fluorosilicone acrylate modified polyurethane emulsion according to claim 2, wherein the surfactant is any one of polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene alkyl allyl ether and octyl phenol polyoxyethylene.
9. The preparation method of the triblock fluorosilicone acrylate modified polyurethane emulsion according to claim 2, wherein the cross-linking agent is any one of N-methylolacrylamide, acid diacyl well and zinc o-methoxybenzoate.
10. The method for preparing the triblock fluorosilicone acrylate modified polyurethane emulsion according to claim 2, wherein the initiator is any one of ammonium persulfate, sodium persulfate and potassium persulfate.
11. The preparation method of the triblock fluorosilicone acrylate modified polyurethane emulsion according to claim 2, wherein the preparation process of the aqueous polyurethane prepolymer is as follows: 5-20 parts of oligomer polyol and 7-25 parts of polyisocyanate are added into a reaction container, and the temperature is raised to 70-90 ℃ under the protection of nitrogen. Detecting the NCO content in the system after 3-5 hours of reaction; and when the NCO content reaches a theoretical value, cooling to 50-60 ℃, adding 0.5-2 parts of hydrophilic chain extender and 0.2-0.5 part of polyalcohol, stirring, heating to 60-85 ℃, and dropwise adding 0.5-2 parts of catalyst and 7-12 parts of acetone or butanone to adjust the viscosity of the prepolymer. And (3) after reacting for 1-3 hours, cooling to room temperature, adding 0.5-2 parts of triethylamine for neutralization reaction for 15 minutes, adding 10-20 parts of deionized water, emulsifying for 15-30 minutes by high-speed shearing, and removing the solvent by reduced pressure distillation to obtain the waterborne polyurethane prepolymer.
CN202211649424.1A 2022-12-21 2022-12-21 Triblock fluorine-silicon synergistic modified waterborne polyurethane-acrylate emulsion and preparation method thereof Pending CN116041713A (en)

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