CN101033322A - Room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion and preparing method thereof - Google Patents
Room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion and preparing method thereof Download PDFInfo
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Abstract
The invention relates to a kind of curing polyurethane crosslinking - polyacrylate water emulsion for a single component coating at room temperature. It is a latex particles water emulsion with core-shell structure which takes polyurethane as the shell and takes polyacrylate as the core. It achieves the crosslinking structure at room temperature through the directly application of polyacrylate and polyurethane film molecular chain without crosslinker. The crosslinking density can reach above 90%.
Description
Technical field:
The present invention relates to a kind of room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion and preparation method thereof.
Background technology:
Aqueous polyurethane (PU) has good physical and mechanical properties, excellent winter hardiness, elasticity and soft durometer varies with temperature advantages such as not too big, is widely used at tackiness agent, fabric finishing agent, hide finishes, coating and ink area.But the water tolerance that aqueous polyurethane is filmed, performances such as solvent resistance have much room for improvement.Polyacrylic ester (PA) emulsion film has advantages such as physical strength height, ageing-resistant, weathering resistance and water-tolerant, but has the shortcoming of hot sticky cold crisp.Waterborne polyurethane resin and acrylic ester emulsion is compound, can overcome shortcoming separately, film performance is significantly improved, promptly so-called " third generation aqueous polyurethane ".
The means of acrylic ester modified water-soluble polyurethane mainly comprise: the unsaturated urethane monomer and the acrylate monomer copolymerization of the two keys of physical blending, anamorphic zone, carry out the acrylate modified urethane of emulsion polymerization prepared (PUA) emulsion etc. with the PU emulsion as seed.Wherein, the mode of physical blending not only simply but also economical, Li Lu (see the development of acrylic modified waterborne polyurethane coating. synthesis material aging and application, 2002 (2) 7-9) etc. the mode by physical blending has prepared acrylic ester modified water-soluble polyurethane coating, and is relatively poor but this physical blending is compared the consistency of PU and PA with chemical copolymerization.Li Yanke (see the research of acrylic ester modified water-soluble polyurethane emulsion property. New Chemical Materials .28 (5)) etc. prepared PUA emulsion with method of emulsion polymerization with nucleocapsid structure, though this structure can be brought into play the advantage of nucleocapsid structure, but almost there is not crosslinking structure, submitting connection except that small part PU micelle closes the PA molecular chain, major part still exists with simple PU and PA, and its over-all properties still can not give full play of PU resin and PA resin characteristics separately.Chinese patent CN1355267A employing emulsion Interpenetrating Polymer Network Technology (LIPN) and seeded emulsion polymerization have made acrylate modified polyurethane binder of the nucleocapsid structure with PU/PA polymer network IPN, but various aspects of performance such as the water tolerance of its emulsion, solvent resistance still need further to improve.Chinese patent CN1129240A has also prepared the polyurethane-polyacrylic ester composite aqueous emulsion with irregular heterogeneous nucleus shell structure, but because its degree of crosslinking is lower, so its film performance still remains to be improved.
Summary of the invention:
The purpose of this invention is to provide a kind of room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion and preparation method thereof.Product is a kind of room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion, is to be shell with urethane, and polyacrylic ester is the polyurethane-polyacrylic ester composite aqueous emulsion of the nucleocapsid structure of nuclear; In this emulsion, since the effect of water dispersant, the COO of a self-emulsifying action
-Can be towards the outside of PU particulate, can not react with the epoxide group of the polyacrylic ester of PU particulate inside, so depositing, this emulsion stablizes; And when it is used, in the process that forms of filming, volatilization along with moisture in the emulsion, particle generation coalescence, crosslinking reaction at room temperature takes place in interparticle carboxyl and epoxide group, has formed interparticle crosslinking structure, thereby improved the water tolerance of paint film, solvent resistance, thermotolerance, various performances such as sticking power and paint film appearance.Polyacrylate modified aqueous polyurethane emulsion of the present invention can be used as the use of single-component coating, tamanori, finishing agent etc.
The preparation method of room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion of the present invention, adopt the method for seeded emulsion polymerization, concrete steps are: be 35～40% aqueous polyurethane seed emulsion with solid content, add deionized water and acrylic ester monomer mixture, it is 1～2.5: 1 that the amount that adds makes the mass ratio of urethane and acrylate monomer blend, then system is heated up and be controlled at 50～90 ℃, logical N
2, and drip redox initiator, and dropwising back insulation 1.5-3 hour, cooling is filtered, and discharging obtains the room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion.
Said acrylic ester monomer mixture by the alkenyl monomer of A, B two class free redical polymerizations with 1～4: 1 mass ratio mixes, wherein:
The category-A monomer is a kind of in the following material group or their mixture: methyl methacrylate, Jia Jibingxisuanyizhi, methacrylic acid, butyl methacrylate, methyl acrylate, ethyl propenoate, butyl acrylate, Octyl acrylate, vinylbenzene, vinylidene chloride, vinyl cyanide, dimethylaminoethyl acrylate methyl base ammonia ethyl ester, 2-EHA, isobornyl methacrylate, isobornyl acrylate, uncle's nine NSC 11801, uncle's ten NSC 11801, uncle's hendecoic acid vinyl acetate, the vinylformic acid isopentyl ester, 2-EHA;
The category-B monomer is the alkenyl monomer that contains the free redical polymerization of epoxy group(ing).Can select for use and be a kind of in the following material or their mixture: glycidyl methacrylate, glycidyl acrylate, vinyl glycidyl ether, glycidyl allyl ether.
Said oxidation-reduction type initiator can be used 1: 1 S-WAT of mass ratio and the mixture of Potassium Persulphate or the mixture of 1: 1 S-WAT of mass ratio and ammonium persulphate among the above-mentioned preparation method, and the consumption of initiator is the 0.1-1% of acrylate monomer blend total mass.
Can also add alkyl oxy DAADBSA disodium emulsifying agent in above-mentioned preparation method's reaction system, the amount of adding is 0～1% of acrylate monomer blend and a urethane total mass.Adding emulsifying agent can increase the stability of emulsion, but the amount that adds wants suitable, otherwise can influence some other performances such as water tolerance behind the emulsion film forming.
Polyacrylic ester in the room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion of the present invention nuclear be by A, B two class monomers carry out initiated polymerization simultaneously in the system of aqueous emulsion of polyurethane formed.Polyurethane shell is formed by polyurethane latex particle in the aqueous emulsion of polyurethane, commonly used method in the synthetic employing prior art of this aqueous emulsion of polyurethane is formed through step-reaction polymerization by diisocyanate monomer, polyester diol, hydrophilic chain extender, small molecule chain extender and solvent and to add triethylamine and deionized water behind the polyurethane prepolymer again and pass through the high speed dispersor water-dispersion and prepare.
Concrete grammar and step are: the formula ratio polyester diol is added reactor, and in 110～120 ℃, vacuum tightness is to dewater 2 hours under the 0.1Mpa condition; The vulcabond that adds formula ratio, 70-75 ℃ was reacted 2 hours; The hydrophilic chain extender that adds formula ratio, 80-85 ℃ was reacted 2 hours down; The small molecule chain extender that adds formula ratio, 80-85 ℃ was reacted 2 hours down; Cool to the solvent viscosity reduction of the adding of back below 40 ℃ formula ratio, above-mentioned reaction solution is transferred in the high speed dispersor, add deionized water and alkali neutralizing agent, disperse to obtain aqueous emulsion of polyurethane through high speed water.
Wherein said polyester diol, be poly-hexanodioic acid-1,4 butanediol ester glycol (PBA), polyethylene glycol adipate glycol (PEA), poly-adipate glycol propylene glycol ester glycol, poly-hexanodioic acid glycol ether esterdiol (PDA), poly-adipate glycol-glycol ether esterdiol, poly-adipate glycol-1,4 butanediol ester glycol, poly-hexanodioic acid neopentyl glycol-1,6-hexylene glycol esterdiol, poly-hexanodioic acid Viscotrol C ester polyol, the poly-epsilon-caprolactone glycol, poly-carbonic acid 1, one or more mixtures of 6-hexylene glycol esterdiol, its number average relative molecular weight is 500-5000, and hydroxyl value is 30-200mgKOH/g.
Described diisocyanate monomer is one or more mixtures in tolylene diisocyanate (TDI-80), (TDI-65), (TDI-100), diphenylmethanediisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), poly methylene poly phenyl poly isocyanate (PAPI), xylylene diisocyanate (XDI), naphthalene diisocyanate (NDI), Methylcyclohexyl diisocyanate (HTDI), dicyclohexyl methane diisocyanate (HMDI), the tetramethylxylylene diisocyanate (TMXDI).Its mole dosage is 200%～600% of a polyester diol mole dosage.
Described hydrophilic chain extender is one or more mixtures in dimethylol propionic acid (DMPA), dihydroxymethyl acetate (DMEA), dimethylolpropionic acid (DMBA), dihydroxymethyl valeric acid, the dihydroxymethyl Succinic Acid.Its mole dosage is 100%～500% of a polyester diol mole dosage.
Described small molecule chain extender, be glycol ether (DEG), ethylene glycol, propylene glycol, 1,4 butyleneglycols, 1,6 hexylene glycols, 1, one or more mixtures in 2 propylene glycol, 1,3 propylene glycol, neopentyl glycol, quadrol, propylene diamine, methylpent diamines, phenylenediamine, tolylene diamine, diphenyl diamine, two amido ditanes, the two amido dicyclohexyl methyl hydrides.Its mole dosage is 20%～60% of a polyester diol mole dosage.
Described solvent is acetone, butanone, methylethylketone, dioxane, N, a kind of in dinethylformamide, the N-Methyl pyrrolidone or their mixture.Its consumption is used polyester diol, 30%～60% of diisocyanate monomer, hydrophilic chain extender and small molecule chain extender total mass.
Described alkali neutralizing agent is a kind of in triethylamine, sodium hydroxide, trolamine, the ammoniacal liquor or their mixture.Its mole dosage is 90%～100% of a hydrophilic chain extender mole dosage.
Embodiment:
Embodiment 1:
(1) with the poly-hexanodioic acid-1 of 149.1 grams, (its number average relative molecular weight is 2000 to 4 butanediol ester glycol (PBA), hydroxyl value is 56mgKOH/g) put into 110～120 ℃, vacuum tightness is the interior dehydration of the four-hole bottle under the 0.1Mpa condition 2 hours, add 41.4 gram tolylene diisocyanates (TDI) then in four-hole bottle, temperature of reaction is controlled at 70～75 ℃ of reactions 2 hours, add 14.2 gram dimethylol propionic acids (DMPA), temperature of reaction is controlled at 80～85 ℃ of reactions 2 hours, add 2.8 gram glycol ethers (DEG) again, maintain the temperature at about 80～85 ℃.React equally again and stop heating after 2 hours and add 100ml acetone viscosity reduction.Then reaction product is moved in the high speed dispersor, after system temperature dropped to below 40 ℃, beginning to carry out 1500 changeed high speed dispersion and stirs, and added 9.2 gram triethylamines (TEA) and 267.5 again and restrained the deionized waters dispersion that neutralizes, distillation at last desolventizes, and obtains solid content and be 40% PU emulsion.
(2) these PU emulsion 100 grams are put into an other four-hole bottle that has water of condensation, stirring, thermometer, Dropping feeder, add 40 gram deionized waters, logical N
2Begin to stir.The acrylic ester monomer mixture that disposable adding is made up of glycidyl methacrylate 13.4 grams, methyl methacrylate 13.4 grams, system heats up, in the time of 60 ℃, drip the aqueous solution that contains ammonium persulphate 0.1335 gram and sodium bisulfite 0.1335 gram respectively simultaneously, begin to carry out initiation reaction, dropwise in 1 hour, and then be incubated 1.5 hours, temperature is controlled at 60～70 ℃.Cooling is filtered, and discharging obtains solid content and be 37% faint yellow translucent blueing light emulsion.
Embodiment 2:
Before disposable adding acrylic ester monomer mixture, in reaction system, add 0.667 gram emulsifying agent alkyl oxy DAADBSA disodium, other step, condition be with embodiment 1, obtains solid content and be 39% faint yellow translucent blueing light emulsion.
Embodiment 3:
Before disposable adding acrylic ester monomer mixture, in reaction system, add 1.334 gram emulsifying agent alkyl oxy DAADBSA disodiums.Other step, condition be with embodiment 1, obtains solid content and be 36% faint yellow translucent blueing light emulsion.
Embodiment 4:
PU emulsion among the embodiment 1 100 grams are put into an other four-hole bottle that has water of condensation, stirring, thermometer, Dropping feeder, add 25.7 gram deionized waters, begin to stir.The acrylic ester monomer mixture of disposable adding glycidyl methacrylate 8.6 grams, methyl methacrylate 8.6 grams, system heats up and leads to N
2, in the time of 60 ℃, drip the aqueous solution that contains ammonium persulphate 0.085 gram and sodium bisulfite 0.085 gram respectively simultaneously, begin to carry out initiation reaction, dropwise in 1 hour, and then be incubated 1.5 hours, temperature is controlled at 60～70 ℃.Cooling is filtered, discharging, and other step, condition are with embodiment 1.Obtain solid content and be 40% faint yellow translucent blueing light emulsion.
Embodiment 5:
PU emulsion among the embodiment 1 100 grams are put into an other four-hole bottle that has water of condensation, stirring, thermometer, Dropping feeder, add 60 gram deionized waters, begin to stir.The acrylic ester monomer mixture of disposable adding glycidyl methacrylate 20 grams, methyl methacrylate 20 grams, system heats up and leads to N
2In the time of 60 ℃, dripping actual solid content respectively simultaneously is the ammonium persulphate and the aqueous solution of sodium bisulfite of 0.4 gram, begins to carry out initiation reaction, dropwises in 1 hour, and then is incubated 1.5 hours, and temperature is controlled at 60～70 ℃.Cooling is filtered, discharging, and other step, condition are identical with embodiment 1.Obtain solid content and be 35% faint yellow translucent blueing light emulsion.
Embodiment 6:
Before disposable adding glycidyl methacrylate 20 grams, methyl methacrylate 20 gram acrylic ester monomer mixtures, add 0.8 gram emulsifying agent alkyl oxy DAADBSA disodium among the embodiment 5.Other step, condition are identical with embodiment 1.Obtain solid content and be 38% faint yellow translucent blueing light emulsion.
Embodiment 7:
Before disposable adding glycidyl methacrylate 20 grams, methyl methacrylate 20 gram acrylic ester monomer mixtures, add 1.6 gram emulsifying agent alkyl oxy DAADBSA disodiums among the embodiment 5.Other step, condition are identical with embodiment 1.Obtain solid content and be 37% faint yellow translucent blueing light emulsion.
Embodiment 8:
With " the acrylic ester monomer mixture that disposable adding is made up of glycidyl methacrylate 13.4 grams, methyl methacrylate 13.4 grams " step changes disposable adding glycidyl methacrylate 8.9 grams among the embodiment 1, methyl methacrylate 17.9 restrains the acrylic ester monomer mixture of forming.All the other conditions are identical with embodiment 1.
Embodiment 9:
With " the acrylic ester monomer mixture that disposable adding is made up of glycidyl methacrylate 13.4 grams, methyl methacrylate 13.4 grams " step changes disposable adding glycidyl methacrylate 6.7 grams among the embodiment 1, methyl methacrylate 20.1 restrains the acrylic ester monomer mixture of forming.All the other conditions are identical with embodiment 1.
Embodiment 10:
With " the acrylic ester monomer mixture that disposable adding is made up of glycidyl methacrylate 13.4 grams, methyl methacrylate 13.4 grams " step changes disposable adding glycidyl methacrylate 5.4 grams among the embodiment 1, methyl methacrylate 21.4 restrains the acrylic ester monomer mixture of forming.All the other conditions are identical with embodiment 1.
In order to test the performance index of polyurethane-polyacrylate room temperature crosslinking curing water miscible liquid of the present invention, the prepared emulsion of embodiment 1-8 is brushed respectively on plank, self-vulcanizing after boiling 15 minutes under 100 ℃ of boiling water, was observed its apparent condition after 24 hours, boiled the back outward appearance as table 1 plank boiling water.Plank is all through brushing after the sand papering 4 times, and is every all over 1 hour at interval.
Table 1: the performance index of room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion and brushing service condition
| Embodiment | Emulsion solid content % | The paint film cross-linking density | Paint film appearance | Sticking power | Hardness of paint film | Paint film water-intake rate % | Toluene specific absorption % | Plank boiling water boils the back outward appearance |
| 1 | 37 | 90.61 | Smooth | 0 grade | H | 4.89 | 65.46 | Constant |
| 2 | 39 | 93.87 | Smooth | 0 grade | H | 5.35 | 65.88 | Constant |
| 3 | 36 | 95.49 | Smooth | 0 grade | H | 6.36 | 70.76 | Substantially constant |
| 4 | 40 | 90.02 | Smooth | 1 grade | H | 7.43 | 73.45 | Constant |
| 5 | 35 | 91.23 | Smooth | 0 grade | H | 6.46 | 74.26 | Constant |
| 6 | 38 | 92.02 | Smooth | 0 grade | H | 7.45 | 76.34 | Substantially constant |
| 7 | 37 | 91.24 | Smooth | 0 grade | H | 7.57 | 67.67 | Substantially constant |
| 8 | 38 | 90.24 | Smooth | 0 grade | H | 5.89 | 67.45 | Constant |
| 9 | 39 | 89.74 | Smooth | 1 grade | H | 7.54 | 70.39 | Substantially constant |
| 10 | 38 | 89.23 | Smooth | 1 grade | H | 8.45 | 75.34 | Substantially constant |
The mensuration of paint film cross-linking density: the method that this area is commonly used, take by weighing a certain amount of film that in baking oven, dries to constant weight, pack in the load weighted in advance filter paper, in cable type extractor according, use acetone extracting 48 hours, film after the extracting is dried to constant weight in baking oven, be calculated as follows the degree of crosslinking of film: film quality (g) * 100% before quality (the g)/extracting of film degree of crosslinking=extracting caudacoria.
The mensuration of paint film water-intake rate: GB/T1733-93 tests according to GB.
The test of toluene specific absorption: method just changes water into toluene with the test of paint film water-intake rate.
The mensuration of emulsion solid content: emulsion solid content is calculated as follows: S=G
1/ G
0In * 100% formula: G
0Be emulsion weight (g), G
1For drying the back solid weight.
The mensuration of paint film adhesion: the measuring method of pressing GB9286-88 is measured
The mensuration of hardness of paint film: the measuring method of pressing GB6739-86 is measured
The prepared room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion of the present invention realized not needing additional crosslink agent and directly using polypropylene acid esters and polyurethane molecular chain when room temperature film-forming, carry out crosslinking curing, cross-linking density reaches (almost completely crosslinked) more than 90%.High cross-linking density can improve the various aspects of performance of film, from the table data as can be seen, the water-intake rate of film can be controlled at below 7%, has reached the use standard of indoor wood lacquer; Aspect solvent resistance, the toluene specific absorption can be controlled at below 80%, and does not have crosslinked film just to dissolve fully in 24 hours under toluene soaks; The thermotolerance aspect, under 100 ℃ of soaking conditionses of boiled water temperature, the film outward appearance is constant substantially; Sticking power can reach highest 0 grade, and hardness of paint film H has reached the service index of " indoor water-borne wood coating industry standard " category-A and category-B, paint film appearance smooth.On the whole, the over-all properties of the prepared room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion of the present invention maintains the leading position in like product.
Claims (5)
1, a kind of room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion, for a kind of be shell with urethane, polyacrylic ester is the water miscible liquid of the compounded latex particle of nuclear, and the mass ratio of polyurethane shell and polyacrylic ester nuclear is 1～2.5: 1, and the solid content of emulsion is 35～55%.
2. the preparation method of a room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion, adopt the method for seeded emulsion polymerization, concrete steps are: be 35～40% aqueous polyurethane seed emulsion with solid content, add deionized water and acrylic ester monomer mixture, it is 1～2.5: 1 that the amount that adds makes the mass ratio of urethane and acrylate monomer blend, then system is heated up and be controlled at 50～90 ℃, logical N
2, and drip redox initiator, and dropwising back insulation 1.5-3 hour, cooling is filtered, and discharging obtains the room temperature crosslinking curing polyurethane-polyacrylic ester composite aqueous emulsion;
Said acrylic ester monomer mixture by the alkenyl monomer of A, B two class free redical polymerizations with 1～4: 1 mass ratio mixes, wherein:
The category-A monomer is a kind of in the following material group or their mixture: methyl methacrylate, Jia Jibingxisuanyizhi, methacrylic acid, butyl methacrylate, methyl acrylate, ethyl propenoate, butyl acrylate, Octyl acrylate, vinylbenzene, vinylidene chloride, vinyl cyanide, dimethylaminoethyl acrylate methyl base ammonia ethyl ester, 2-EHA, isobornyl methacrylate, isobornyl acrylate, uncle's nine NSC 11801, uncle's ten NSC 11801, uncle's hendecoic acid vinyl acetate, the vinylformic acid isopentyl ester, 2-EHA;
The category-B monomer is the alkenyl monomer that contains the free redical polymerization of epoxy group(ing).
3. according to the preparation method of claim 2, it is characterized in that: the category-B monomer is a kind of in the following material or their mixture: glycidyl methacrylate, glycidyl acrylate, vinyl glycidyl ether, glycidyl allyl ether.
4. according to the preparation method of claim 2, it is characterized in that: the oxidation-reduction type initiator is the mixture of 1: 1 S-WAT of mass ratio and Potassium Persulphate or the mixture of 1: 1 S-WAT of mass ratio and ammonium persulphate, and the consumption of initiator is the 0.1-1% of acrylic ester monomer mixture total mass.
5. according to the preparation method of claim 2 or 3 or 4, it is characterized in that: add alkyl oxy DAADBSA disodium emulsifying agent in the reaction system, the amount of adding is 0～1% of acrylic ester monomer mixture and a urethane total mass.
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