CN104212293A - Waterborne acrylic acid antifogging coating and preparation method thereof - Google Patents
Waterborne acrylic acid antifogging coating and preparation method thereof Download PDFInfo
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Abstract
The invention provides a waterborne acrylic acid antifogging coating and a preparation method thereof. The antifogging coating comprises a prime coating and a top coating, wherein the top coating comprises an acrylic emulsion, a coalescing agent, a flattening agent, a thickener and a defoaming agent, the acrylic emulsion is prepared by carrying out emulsion polymerization on monomer raw materials comprising alkyl acrylate, polyol (methyl) acrylate, acrylic acid, methacrylic acid and a crosslinking monomer, the prime coating comprises an organic-silicone-modified acrylic emulsion, a coalescing agent, a flattening agent, a thickener and a defoaming agent and the organic-silicone-modified acrylic emulsion is prepared by carrying out emulsion polymerization on monomer raw materials comprising methyl methacrylate, styrene, alkyl acrylate, an organic silicone monomer and a crosslinking monomer. The waterborne acrylic acid antifogging coating disclosed by the invention is obtained by combining the prime coating and the top coating, and the antifogging coat prepared from the antifogging coating has the advantages of good adhesion force, water resistance and antifogging property.
Description
Technical field
The present invention relates to technical field of coatings, be specifically related to a kind of water soluble acrylic acid anti-fog coating and preparation method thereof.
Background technology
Transparent substrate as glass, transparent resin material in use, when there is a fixed difference difference in base material both sides, during vapour pressure lower than surrounding environment of the saturated vapor pressure of low temperature side substrate surface moisture content, steam is assembled to substrate surface and is formed mist with the form of tiny drops of water, refraction and diffusion are formed to light, thus significantly reduce the transmittance of base material, thus at some special application fields such as windshield, ophthalmic lens etc., there is widespread demand to the base material with anti-fog function.
Form at substrate surface coating anti-fog coating the main direction of studying that antifogging coating is current antifog technology, comprise hydrophobicity antifogging coating and wetting ability antifogging coating.Wherein, the coating that esters of acrylic acid coating is formed is one of principal item of wetting ability antifogging coating, but the sticking power of existing acrylate coatings to base material is poor, usually need to carry out special activation treatment to base material or increase undercoat, coating runs off due to poor water resistance through long-time current scour rear surface hydrophilic substance simultaneously, cause the anti-fog effect of coating persistence bad, application request cannot be met completely.
Summary of the invention
In order to solve above-mentioned prior art Problems existing, the invention provides a kind of water soluble acrylic acid anti-fog coating and preparation method thereof, this coating comprises priming paint and investment precoat, priming paint and the rear compound coating formed of investment precoat solidification have good sticking power to base material, make coating entirety have excellent water tolerance and lasting hydrophilic antifogging performance.
The technical solution used in the present invention is:
A kind of water soluble acrylic acid anti-fog coating, comprise priming paint and investment precoat, described priming paint comprises organosilicon-modified acrylic emulsion, film coalescence aid, flow agent, thickening material and defoamer, and described investment precoat comprises ACRYLIC EMULSION, film coalescence aid, flow agent, thickening material and defoamer;
Described organosilicon-modified acrylic emulsion is prepared through letex polymerization by the raw material monomer comprising methyl methacrylate, vinylbenzene, alkyl acrylate, organosilane monomer and cross-linking monomer, described organosilane monomer is vinyl alkoxy silane, and described alkyl acrylate is one or more in the just own ester of ethyl propenoate, n-propyl, n-butyl acrylate, vinylformic acid, Isooctyl acrylate monomer;
Described ACRYLIC EMULSION is prepared through letex polymerization by the raw material monomer comprising alkyl acrylate, polyvalent alcohol (methyl) acrylate, vinylformic acid, methacrylic acid and cross-linking monomer, and described alkyl acrylate is selected from one or more in n-butyl acrylate, ethyl propenoate, Isooctyl acrylate monomer.
Water soluble acrylic acid anti-fog coating of the present invention comprises and being made up of the priming paint of excellent adhesive attraction and hydrophilic investment precoat base material, all with corresponding emulsion for main component, and the sticking power of surface layer and base material is improved by the coating that priming paint is formed, make the coating prepared by coating of the present invention have good anti-fog performance and water tolerance.
Preferably, the second-order transition temperature of described organosilicon-modified acrylic emulsion is 25-30 DEG C, and the second-order transition temperature of described ACRYLIC EMULSION is 25-30 DEG C.
Preferably, the solid content of described organosilicon-modified acrylic emulsion is 47-50%.
Preferably, the solid content of described ACRYLIC EMULSION is 40-46%.
Preferably, in the raw material monomer of described ACRYLIC EMULSION, described alkyl acrylate comprises n-butyl acrylate and Isooctyl acrylate monomer.
In the present invention, (methyl) acrylate of hydroxyl represents the acrylate of hydroxyl and/or the methacrylic ester of hydroxyl, (methyl) acrylate containing epoxy group(ing) represents the acrylate containing epoxy group(ing) and/or the methacrylic ester containing epoxy group(ing), and (methyl) vinylformic acid represents acrylate and/or methacrylic ester.
In the raw material monomer of described ACRYLIC EMULSION, cross-linking monomer be hydroxyl (methyl) acrylate, containing one or more in the acrylamide of (methyl) acrylate of epoxy group(ing), hydroxyl.
Preferably, in the raw material monomer of described ACRYLIC EMULSION, cross-linking monomer is selected from one or more in vinylformic acid-hydroxyl ethyl ester, vinylformic acid-hydroxypropyl acrylate, methacrylic acid-hydroxypropyl acrylate, glycidyl methacrylate, N-butoxymethyl acrylamide, N hydroxymethyl acrylamide, by adding cross-linking monomer, the wetting ability that the coating that investment precoat is formed has had and water tolerance.
In the present invention, polyvalent alcohol (methyl) acrylate represents polyalcohol acrylate and/or polyvalent alcohol methacrylic ester.
Preferably, in the raw material monomer of described ACRYLIC EMULSION, polyvalent alcohol (methyl) acrylate is selected from one or more in three (methacrylic acid) trihydroxymethylpropanyl ester, Viscoat 295, Diethylene Glycol double methacrylate, ethylene glycol bisthioglycolate (methacrylic acid) ester, pentaerythritol triacrylate, can improve the sticking power to substrate surface after the stability of reaction system and film forming.
Preferably, the raw material monomer of described organosilicon-modified acrylic emulsion also comprises double bond containing ketone carbonyl compound, comprise the compound with two or more hydrazide groups in priming paint, described in there is the hydrazide group in the compound of two or more hydrazide groups and the ketone carbonyl in double bond containing ketone carbonyl compound mol ratio be 1:(0.6-1).
Further preferably, described double bond containing ketone carbonyl compound is one or more in diacetone-acryloamide(DAA), methacrylic acid acetoxy ethyl ester, methyl vinyl ketone, described in there are two or more hydrazide groups compound be one or more in carbon acid dihydrazide, succinic acid hydrazide ii, adipic dihydrazide, careless acid dihydrazide.
In the raw material monomer of described organosilicon-modified acrylic emulsion, organosilane monomer is vinyl alkoxy silane, and described alkoxyl group comprises methoxyl group, oxyethyl group or isopropoxy, is preferably oxyethyl group.
Preferably, in the raw material monomer of described organosilicon-modified acrylic emulsion, cross-linking monomer comprises one or more in (methyl) acrylate of hydroxyl, (methyl) acrylate of epoxy group(ing), (methyl) vinylformic acid.In (methyl) acrylate preferred vinylformic acid-hydroxyl ethyl ester of hydroxyl, vinylformic acid-hydroxypropyl acrylate, methacrylic acid-hydroxypropyl acrylate one or more; Containing (methyl) acrylate preferable methyl glycidyl acrylate of epoxy group(ing).
Preferably, described ACRYLIC EMULSION prepares through letex polymerization by comprising the following raw material monomer counted by weight:
Described vinylformic acid: the mass ratio of methacrylic acid is 2:(1-2).
The raw material monomer of described organosilicon-modified acrylic emulsion comprises double bond containing ketone carbonyl compound, and when priming paint comprises the compound with two or more hydrazide groups, preferably, the consumption of described double bond containing ketone carbonyl compound is 2-5 weight part.
Preferably, the raw material monomer of described ACRYLIC EMULSION also comprise in methacrylic ester cyclohexyl, C9 tertiary ethylene carbonate, isobornyl methacrylate, isobornyl acrylate more than one, can improve the water tolerance of polymkeric substance and the glossiness of film, consumption is 8-20 weight part.
The present invention is by the combination of monomers of cross-linking monomer and vinylformic acid, methacrylic acid and increase the wetting ability that monomer consumption improves acrylic resin copolymerization product, forms transparent hydrophilic acrylic's coating after making the investment precoat film forming containing this ACRYLIC EMULSION.
Preferably, described organosilicon-modified acrylic emulsion prepares through letex polymerization by comprising the following raw material monomer counted by weight:
Preferably, the raw material monomer of described organosilicon-modified acrylic emulsion also comprises cyclohexyl methacrylate, C
9more than one in tertiary ethylene carbonate, isobornyl methacrylate, isobornyl acrylate, consumption is 5-20 weight part.
Preferably, described priming paint comprises the organosilicon-modified acrylic emulsion of 170-185 weight part and the film coalescence aid of 5-12 weight part.
One or more without particular restriction, in preferred alcohol ester 12, propylene glycol mono-oleate, diisopropanol adipic acid ester, water-soluble silicon oil of film coalescence aid in described priming paint.Also can contain other conventional coatings additive(s)s in priming paint, without particular restriction, comprise the usual auxiliaries in the preparation of the coating such as thickening material, flow agent, defoamer and mould inhibitor, antifreezing agent, anticorrosive additive.
Preferably, described priming paint is 400-2000mPas the kinetic viscosity value of 25 DEG C.
Preferably, described investment precoat comprises the ACRYLIC EMULSION of 165-175 weight part and the film coalescence aid of 10-25 weight part.
Film coalescence aid in described investment precoat without particular restriction, more than one in preferred alcohol ester 12, propylene glycol mono-oleate, diisopropanol adipic acid ester, water-soluble silicon oil.Containing other conventional coatings additive(s)s in investment precoat, without particular restriction, comprise auxiliary agent conventional in the varnish preparations such as thickening material, flow agent, defoamer, and mould inhibitor, antifreezing agent, anticorrosive additive etc., concrete material and consumption do not have particular requirement.
Preferably, described investment precoat is 400-2000mPas the kinetic viscosity value of 25 DEG C.
The preparation method of water soluble acrylic acid anti-fog coating of the present invention, comprise the preparation of investment precoat and the preparation of priming paint, the preparation of investment precoat comprises the following steps:
(1) emulsifying agent is mixed with water, add alkyl acrylate, cross-linking monomer, methacrylic acid, vinylformic acid, polyvalent alcohol (methyl) acrylate and initiator solution and carry out emulsification, obtain pre-emulsion;
(2) emulsifying agent is mixed with water, the pre-emulsion of pre-emulsion total mass 5%-12% in adding initiator solution and accounting for step (1), temperature reaction, obtain seed emulsion, described in account for water in the pre-emulsion of pre-emulsion total mass 5%-12% in step (1) and this step mass ratio be 1:(5-10);
(3) in seed emulsion, drip residue pre-emulsion and carry out polyreaction, dripping process reaction temperature is 78-83 DEG C, is warming up to 83-85 DEG C and continues reaction 1-1.5h, cooling, regulate pH to 7 ~ 8, obtain ACRYLIC EMULSION after being added dropwise to complete;
(4) film coalescence aid, flow agent, thickening material, defoamer are mixed with ACRYLIC EMULSION, control ph is 8 ~ 9, obtains investment precoat.
In the present invention, emulsifying agent is without particular restriction.
Preferably, in described step (1), emulsifying agent is the compound emulsifying agent of reactive emulsifier and anionic emulsifier, described reactive emulsifier is selected from one or more in allyloxy hydroxide sodium dimercaptosulphanatein, methallyl hydroxide sodium dimercaptosulphanatein, sodium vinyl sulfonate, alkylamide vinyl sulfonic acid sodium, sodium p styrene sulfonate, and described anionic emulsifier is selected from one or more in sodium lauryl sulphate, sodium oleate, sodium abietate, sodium laurate, Sodium dodecylbenzene sulfonate, alkyl phenol polyether sulfosuccinic acid monoesters sodium salt.
Preferably, in described step (2), emulsifying agent is the compound emulsifying agent of reactive emulsifier and ionic emulsifying agent and/or nonionic emulsifier, described reactive emulsifier is selected from one or more in allyloxy hydroxide sodium dimercaptosulphanatein, methallyl hydroxide sodium dimercaptosulphanatein, sodium vinyl sulfonate, alkylamide vinyl sulfonic acid sodium, sodium p styrene sulfonate, and described ionic emulsifying agent is polyoxyethylenated alcohol sodium sulfate and/or alkyl phenol polyether sulfosuccinic acid monoesters sodium salt.
Preferably, in step (2), described temperature reaction is warming up to 75-80 DEG C, is incubated 5-10min after question response liquid flooding blue light.
Described initiator solution is the aqueous solution of initiator, and described initiator is persulphate thermal decomposition initiating, comprises ammonium persulphate, Sodium Persulfate, Potassium Persulphate etc.
Preferably, the time of described dropping is 2.5-4h.
Preferably, the preparation of described priming paint comprises the following steps:
Emulsifying agent is mixed with water, methyl methacrylate, vinylbenzene, organosilane monomer, alkyl acrylate, cross-linking monomer and initiator solution is carried out emulsification, obtains pre-emulsion;
Emulsifying agent is mixed with water, add initiator solution and the pre-emulsion accounting for pre-emulsion total mass 15%-25%, temperature reaction, reacted and obtained seed emulsion, in seed emulsion, drip residue pre-emulsion carry out polyreaction, the temperature of reaction dripping process is 80-85 DEG C, be warming up to 85-90 DEG C after being added dropwise to complete and continue reaction 1-1.5h, cooling, regulates pH to 7 ~ 8, obtains organosilicon-modified acrylic emulsion;
Film coalescence aid, flow agent, thickening material, defoamer are mixed with organosilicon-modified acrylic emulsion, control ph is 8 ~ 9, obtains priming paint.
In the present invention, emulsifying agent is without particular restriction.
Preferably, in described pre-emulsion preparation process, described emulsifying agent is the compound emulsifying agent of reactive emulsifier and anionic emulsifier, described reactive emulsifier is selected from one or more in allyloxy hydroxide sodium dimercaptosulphanatein, methallyl hydroxide sodium dimercaptosulphanatein, sodium vinyl sulfonate, alkylamide vinyl sulfonic acid sodium, sodium p styrene sulfonate, and described anionic emulsifier is selected from one or more in sodium lauryl sulphate, sodium oleate, sodium abietate, sodium laurate, Sodium dodecylbenzene sulfonate, alkyl phenol polyether sulfosuccinic acid monoesters sodium salt.
Preferably, in described seed emulsion preparation process, emulsifying agent is the compound emulsifying agent comprising reactive emulsifier and ionic emulsifying agent and/or nonionic emulsifier, and described reactive emulsifier is selected from one or more in allyloxy hydroxide sodium dimercaptosulphanatein, methallyl hydroxide sodium dimercaptosulphanatein, sodium vinyl sulfonate, alkylamide vinyl sulfonic acid sodium, sodium p styrene sulfonate.Described ionic emulsifying agent is polyoxyethylenated alcohol sodium sulfate and/or alkyl phenol polyether sulfosuccinic acid monoesters sodium salt.
The present invention further provides the application of described water soluble acrylic acid anti-fog coating, for the preparation of antifogging coating, method applies priming paint on base material, obtains bottom after surface drying, then coated side coating, obtains antifogging coating after solidification.In described application, surface drying after coating priming paint, makes the coating of gained bottom not influence surface coating.
Preferably, the thickness of described bottom is 15-20 μm, and the thickness of described antifogging coating is 30-50 μm.
The technique effect that the present invention is useful: water soluble acrylic acid anti-fog coating of the present invention comprises the priming paint and the investment precoat that base material are had to excellent adhesive attraction, all with corresponding polymer emulsion for main component, the compound coating that gained coating is formed has good sticking power, water tolerance and lasting anti-fog performance (coatingsurface is less than 20 ° at 25 DEG C and the contact angle of water), can be applicable to antifog technical field, and raw material is easy to get, preparation technology is simple, and safety and environmental protection, is convenient to industrialization.
Embodiment
Below provide specific embodiment to be further detailed the present invention.
Embodiment 1
The preparation method of investment precoat, comprises following operation steps:
Prepare surface layer ACRYLIC EMULSION:
Take 2.5g ammonium persulphate to be dissolved in 40g deionized water and to obtain initiator solution;
Take 1.0g sodium lauryl sulphate, 2.0g sodium p styrene sulfonate mixes with 140g deionized water, add n-butyl acrylate 142.5g, Isooctyl acrylate monomer 40g, three (methacrylic acid) trihydroxymethylpropanyl ester 60g, methacrylic acid 45g, vinylformic acid 22.5g, hydroxyethyl methylacrylate 99g, N hydroxymethyl acrylamide 22.5g and 30g initiator solution, obtain pre-emulsion;
Take 2.5g alkyl phenol polyether sulfosuccinic acid monoesters sodium salt (MS-1 emulsifying agent, Jiangsu Hai'an Petrochemical Plant), 2.5g sodium p styrene sulfonate mixes with 360g deionized water and is warming up to 80 DEG C, add 10g initiator solution and 60.5g pre-emulsion, insulation reaction 10min after the general obvious blue light of emulsion, obtains seed emulsion;
Residue pre-emulsion is dripped in seed emulsion, dripping process reaction temperature is 80 DEG C, time for adding is 3h, be warming up to 85 DEG C after being added dropwise to complete, after insulation reaction 1.5h, be cooled to 45 DEG C, with ammoniacal liquor adjust pH to 7, discharging is filtered after continuing to stir 10min, obtain ACRYLIC EMULSION, solid content is 44.7%, and the second-order transition temperature adopting dsc (DSC) to test emulsion according to GB19466-2 is 25.5 DEG C;
By mould inhibitor 0.2g, defoamer 1.0g, film coalescence aid water-soluble silicon oil 10g, flow agent (BPLE/B, Shanghai Mo Tian Chemical Co., Ltd.) 5g, thickening material Rm-8w6g, antifreezing agent polyoxyethylene glycol (200) 6g and 171g ACRYLIC EMULSION mixing, adding ammoniacal liquor adjust ph is 8, stir, filter, obtain investment precoat, adopting NDJ-1 rotational viscosimeter to test it the kinetic viscosity value of 25 DEG C is 1200mPas.
Embodiment 2
The preparation method of investment precoat, comprises following operation steps:
Preparation ACRYLIC EMULSION:
Take 2.5g ammonium persulphate to be dissolved in 40g deionized water and to obtain initiator solution;
Take 1.0g sodium lauryl sulphate, 2.0g sodium p styrene sulfonate mixes with 170g deionized water, add n-butyl acrylate 137.5g, Isooctyl acrylate monomer 30g, three (methacrylic acid) trihydroxymethylpropanyl ester 45g, C
9tertiary ethylene carbonate 30g, methacrylic acid 45g, vinylformic acid 22.5g, hydroxyethyl methylacrylate 69g, N hydroxymethyl acrylamide 22.5g and 30g initiator solution, obtain pre-emulsion;
Take 2.5g alkyl phenol polyether sulfosuccinic acid monoesters sodium salt (MS-1 emulsifying agent, Jiangsu Hai'an Petrochemical Plant), 2.5g sodium p styrene sulfonate mixes with 390g deionized water and is warming up to 80 DEG C, add 10g initiator solution and 40.3g pre-emulsion, insulation reaction 10min after the general obvious blue light of emulsion, obtains seed emulsion;
Residue pre-emulsion is dripped in seed emulsion, dripping process reaction temperature is 80 DEG C, time for adding is 3h, be warming up to 85 DEG C after being added dropwise to complete, after insulation reaction 1.5h, be cooled to 45 DEG C, with ammoniacal liquor adjust pH to 7, discharging is filtered after continuing to stir 10min, obtain ACRYLIC EMULSION, solid content is 40.6%, and the second-order transition temperature adopting dsc (DSC) to test emulsion according to GB19466-2 is 26.5 DEG C;
By mould inhibitor 0.2g, defoamer 1.0g, film coalescence aid water-soluble silicon oil 10g, flow agent (BPLE/B, rub field chemical industry in Shanghai) 5g, thickening material Rm-8w6g, antifreezing agent polyoxyethylene glycol (200) 6g and 171g ACRYLIC EMULSION mixing, adding ammoniacal liquor adjust ph is 8, stir, filter, obtain investment precoat, adopting NDJ-1 rotational viscosimeter to test it the kinetic viscosity value of 25 DEG C is 1100mPas.
Embodiment 3
The preparation method of investment precoat, comprises following operation steps:
Preparation ACRYLIC EMULSION:
Take 2.5g ammonium persulphate to be dissolved in 40g deionized water and to obtain initiator solution;
Take 1.0g sodium lauryl sulphate, 2.0g sodium p styrene sulfonate mixes with 140g deionized water, add n-butyl acrylate 137.5g, Isooctyl acrylate monomer 40g, three (methacrylic acid) trihydroxymethylpropanyl ester 85g, methacrylic acid 25g, vinylformic acid 25g, hydroxyethyl methylacrylate 91.5g, N hydroxymethyl acrylamide 22.5g and 30g initiator solution, obtain pre-emulsion;
Take 1.5g alkyl phenol polyether sulfosuccinic acid monoesters sodium salt (MS-1 emulsifying agent, Jiangsu Hai'an Petrochemical Plant), polyoxyethylenated alcohol sodium sulfate 1.0g, 2.5g sodium p styrene sulfonate mixes with 360g deionized water and is warming up to 80 DEG C, add 10g initiator solution and 62g pre-emulsion, insulation reaction 10min after the general obvious blue light of emulsion, obtains seed emulsion;
Residue pre-emulsion is dripped in seed emulsion, dripping process reaction temperature is 80 DEG C, time for adding is 3h, be warming up to 85 DEG C after being added dropwise to complete, after insulation reaction 1.5h, be cooled to 45 DEG C, with ammoniacal liquor adjust pH to 7, discharging is filtered after continuing to stir 10min, obtain ACRYLIC EMULSION, solid content is 44.4%, and the second-order transition temperature adopting dsc (DSC) to test emulsion according to GB19466-2 is 26.7 DEG C;
By mould inhibitor 0.2g, defoamer 1.0g, film coalescence aid water-soluble silicon oil 10g, flow agent BPLE/B5g, thickening material Rm-8w6g, the mixing of antifreezing agent polyoxyethylene glycol (200) 6g and 171g ACRYLIC EMULSION, be 8 with ammoniacal liquor adjust pH, stir, filter, obtain investment precoat, adopting NDJ-1 rotational viscosimeter to test it the kinetic viscosity value of 25 DEG C is 1200mPas.
Embodiment 4
The preparation method of priming paint, comprises following operation steps:
Prepare organosilicon-modified acrylic emulsion:
Take 2.5g ammonium persulphate to be dissolved in 40g deionized water and to obtain initiator solution;
Take 1.0g sodium lauryl sulphate, 2.0g alkylamide vinyl sulfonic acid sodium (DNS-86) mixes with 140g deionized water and stirring, add methyl methacrylate 230g, cyclohexyl methacrylate 43g, n-butyl acrylate 150g, vinyltrimethoxy silane 48g, vinylformic acid 4g and 30g initiator solution, stir 20min, obtain pre-emulsion;
Take 2.5g polyoxyethylenated alcohol sodium sulfate, 2.5g alkylamide vinyl sulfonic acid sodium (DNS-86) and 330g deionized water mix and blend, be warming up to 80 DEG C, add 10g initiator solution and 164g pre-emulsion, insulation reaction 10min after the general obvious blue light of emulsion, obtains seed emulsion;
Residue pre-emulsion is dripped in seed emulsion, dripping process reaction temperature is 85 DEG C, drip off in 2h, be warming up to 88 DEG C, after continuing insulation 1.5h, be cooled to 45 DEG C, with ammoniacal liquor adjust pH to 7 ~ 8, filter discharging, obtain organosilicon-modified acrylic emulsion, solid content is 48.6%, and the second-order transition temperature adopting dsc (DSC) to test emulsion according to GB19466-2 is 27.8 DEG C.
By organosilicon-modified acrylic emulsion 180g, mould inhibitor 0.2g, defoamer 1.0g, water molecules barrier agent 1.0g, film coalescence aid water-soluble silicon oil 5g, flow agent (BPLE/B, rub field chemical industry in Shanghai) 5g, thickening material Rm-8w6g, antifreezing agent polyoxyethylene glycol (200) 6g mix, recording pH value is 8, stir, filter, obtain priming paint, adopting NDJ-1 rotational viscosimeter to test it the kinetic viscosity value of 25 DEG C is 1500mPas.
Embodiment 5
The preparation method of priming paint, comprises following operation steps:
Prepare organosilicon-modified acrylic emulsion:
Take 2.5g ammonium persulphate to be dissolved in 40g deionized water and to obtain initiator solution;
Take 1.0g sodium lauryl sulphate, 2.0g alkylamide vinyl sulfonic acid sodium (DNS-86) mixes with 120g deionized water and stirring, add methyl methacrylate 200g, C9 tertiary ethylene carbonate 40g, n-butyl acrylate 167g, vinylbenzene 42g, vinyltrimethoxy silane 36g, vinylformic acid 6g, to be dissolved in solution and 30g initiator solution that 20g deionized water obtains by 6g diacetone-acryloamide(DAA), stir, obtain pre-emulsion;
Take 1.5g alkyl phenol polyether sulfosuccinic acid monoesters sodium salt (MS-1 emulsifying agent, Jiangsu Hai'an Petrochemical Plant), polyoxyethylenated alcohol sodium sulfate 1.0g, 2.5g alkylamide vinyl sulfonic acid sodium (DNS-86) and 330g deionized water mix and blend, be warming up to 80 DEG C, add 10g initiator solution and 111.7g pre-emulsion, insulation reaction 10min after the general obvious blue light of emulsion, obtains seed emulsion;
Residue pre-emulsion is dripped in seed emulsion, dripping process reaction temperature is 85 DEG C, drip off in 2h, be warming up to 88 DEG C, after insulation 1.5h, be cooled to 45 DEG C, with ammoniacal liquor adjust pH to 7, add 5g adipic dihydrazide and be dissolved in the solution that 10g water obtains, filter discharging, obtain organosilicon-modified acrylic emulsion, solid content is 49.7%, and the second-order transition temperature adopting dsc (DSC) to test emulsion according to GB19466-2 is 26.3 DEG C.
By organosilicon-modified acrylic emulsion 180g, mould inhibitor 0.2g, defoamer 1.0g, water molecules barrier agent 1.0g, film coalescence aid water-soluble silicon oil 5g, flow agent (BPLE/B, rub field chemical industry in Shanghai) 5g, thickening material Rm-8w6g, polyoxyethylene glycol (200) 6g mix, adding ammoniacal liquor adjust ph is 8, stir, filter, obtain priming paint, adopting NDJ-1 rotational viscosimeter to test it the kinetic viscosity value of 25 DEG C is 1400mPas.
Testing example
Priming paint combination prepared by the investment precoat prepared with embodiment 1 ~ 3 and embodiment 4 ~ 5 obtains 1-4 water soluble acrylic acid anti-fog coating, in table 1.Vinylformic acid antifogging coating is prepared respectively by 1-4 water soluble acrylic acid anti-fog coating, preparation method is: priming paint is sprayed at 50mm × 50mm, on the thickness glass substrate that to be 1mm cross through ethanol with seven apertures in the human head high atomization varnish spray gun under 0.3 ~ 0.5MPa air pressure, the bottom that thickness is 15-25 μm is obtained after about 0.5h surface drying, spraying surface coating again, in 80 DEG C of solidification 2h, obtain No. 1-4 testing sample with antifogging coating, total coating thickness is 30-50 μm.
Measure the sticking power after coating film forming according to GB9286-98 hundred lattice testing standard, be designated as the sticking power of 0d.
Test the lasting sticking power of antifogging coating, water tolerance and protracted hydrophilicity, method is: gained testing sample is placed in 25 DEG C of water, make the antifogging coating of 2/3 area be dipped in 3d in water, observe the degree that antifogging coating turns white and comes off, investigate the water tolerance of antifogging coating; After being taken out by sample, the immersed part antifogging coating of test is at 25 DEG C of contact angles with water, contrast with the contact angle before not soaking, and contact angle adopts contact angle measurement (model is JGW-360A) mensuration, the protracted hydrophilicity of investigation antifogging coating; After being taken out by sample, the sticking power of the immersed part antifogging coating of test, contrasts with the sticking power before not soaking, and investigates the lasting sticking power of antifogging coating.
Test result is in table 1.
Table 1
As seen from the data in Table 1, the present invention is combined by priming paint and investment precoat and obtains water-based anti-fog coating, antifogging coating prepared therefrom has good sticking power and water tolerance, still better through long-time water immersion test postadhesion power, surface layer wetting ability improves simultaneously, thus ensure that the lasting anti-fog performance of antifogging coating, be a kind of novel environment-friendly anti-fog coating of lasting anti-fog performance excellence.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. a water soluble acrylic acid anti-fog coating, comprise priming paint and investment precoat, described priming paint comprises organosilicon-modified acrylic emulsion, film coalescence aid, flow agent, thickening material and defoamer, and described investment precoat comprises ACRYLIC EMULSION, film coalescence aid, flow agent, thickening material and defoamer;
Described organosilicon-modified acrylic emulsion is prepared through letex polymerization by the raw material monomer comprising methyl methacrylate, vinylbenzene, alkyl acrylate, organosilane monomer and cross-linking monomer, described organosilane monomer is vinyl alkoxy silane, and described alkyl acrylate is one or more in the just own ester of ethyl propenoate, n-propyl, n-butyl acrylate, vinylformic acid, Isooctyl acrylate monomer;
Described ACRYLIC EMULSION is prepared through letex polymerization by the raw material monomer comprising alkyl acrylate, polyvalent alcohol (methyl) acrylate, vinylformic acid, methacrylic acid and cross-linking monomer, and described alkyl acrylate is selected from one or more in n-butyl acrylate, ethyl propenoate, Isooctyl acrylate monomer.
2. water soluble acrylic acid anti-fog coating as claimed in claim 1, it is characterized in that, the second-order transition temperature of described organosilicon-modified acrylic emulsion is 25-30 DEG C, and the second-order transition temperature of described ACRYLIC EMULSION is 25-30 DEG C.
3. water soluble acrylic acid anti-fog coating as claimed in claim 1, it is characterized in that, the solid content of described ACRYLIC EMULSION is 40-46%.
4. water soluble acrylic acid anti-fog coating as described in claim 1-3, is characterized in that, described ACRYLIC EMULSION prepares through letex polymerization by comprising the following raw material monomer counted by weight:
Described vinylformic acid: the mass ratio of methacrylic acid is 2:(1-2).
5. water soluble acrylic acid anti-fog coating as described in any one of claim 1-3, it is characterized in that, described polyvalent alcohol (methyl) acrylate is selected from one or more in trimethylolpropane tris (methacrylic acid) ester, Viscoat 295, Diethylene Glycol double methacrylate, ethylene glycol bisthioglycolate (methacrylic acid) ester, pentaerythritol triacrylate.
6. water soluble acrylic acid anti-fog coating as described in any one of claim 1-3, is characterized in that, described organosilicon-modified acrylic emulsion prepares through letex polymerization by comprising the following raw material monomer counted by weight:
7. water soluble acrylic acid anti-fog coating as described in any one of claim 1-3, it is characterized in that, the raw material monomer of described organosilicon-modified acrylic emulsion also comprises double bond containing ketone carbonyl compound, and described priming paint also comprises the compound with two or more hydrazide groups.
8. water soluble acrylic acid anti-fog coating as described in any one of claim 1-3, is characterized in that, described investment precoat comprises the ACRYLIC EMULSION of 165-175 weight part and the film coalescence aid of 10-25 weight part.
9. the preparation method of water soluble acrylic acid anti-fog coating as described in any one of claim 1-3, it is characterized in that, the preparation of described investment precoat comprises the following steps:
(1) emulsifying agent is mixed with water, add alkyl acrylate, cross-linking monomer, methacrylic acid, vinylformic acid, polyvalent alcohol (methyl) acrylate and initiator solution and carry out emulsification, obtain pre-emulsion;
(2) emulsifying agent is mixed with water, the pre-emulsion of pre-emulsion total mass 5%-12% in adding initiator solution and accounting for step (1), temperature reaction, obtain seed emulsion, described in account for water in the pre-emulsion of pre-emulsion total mass 5%-12% in step (1) and this step mass ratio be 1:(5-10);
(3) in seed emulsion, drip residue pre-emulsion and carry out polyreaction, dripping process reaction temperature is 78-83 DEG C, is warming up to 83-85 DEG C and continues reaction 1-1.5h, cooling, regulate pH to 7 ~ 8, obtain ACRYLIC EMULSION after being added dropwise to complete;
(4) film coalescence aid, flow agent, thickening material, defoamer are mixed with ACRYLIC EMULSION, control ph is 8 ~ 9, obtains investment precoat.
10. the preparation method of water soluble acrylic acid anti-fog coating as described in any one of claim 1-3, it is characterized in that, the preparation of described priming paint comprises the following steps:
Emulsifying agent is mixed with water, methyl methacrylate, vinylbenzene, organosilane monomer, alkyl acrylate, cross-linking monomer and initiator solution is carried out emulsification, obtains pre-emulsion;
Emulsifying agent is mixed with water, add initiator solution and the pre-emulsion accounting for pre-emulsion total mass 15%-25%, temperature reaction, reacted and obtained seed emulsion, in seed emulsion, drip residue pre-emulsion carry out polyreaction, the temperature of reaction dripping process is 80-85 DEG C, be warming up to 85-90 DEG C after being added dropwise to complete and continue reaction 1-1.5h, cooling, regulates pH to 7 ~ 8, obtains organosilicon-modified acrylic emulsion;
Film coalescence aid, flow agent, thickening material, defoamer are mixed with organosilicon-modified acrylic emulsion, control ph is 8 ~ 9, obtains priming paint.
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