CN110698943A - Weather-resistant emulsion and preparation method and application thereof - Google Patents
Weather-resistant emulsion and preparation method and application thereof Download PDFInfo
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Abstract
A weather-resistant emulsion, a preparation method and an application thereof belong to the technical field of exterior wall coatings, and the weather-resistant emulsion comprises the following components in parts by weight: 400 portions of deionized water, 1 to 50 portions of reactive emulsifier, 0.5 to 50 portions of hydrophilic monomer, 0.5 to 100 portions of functional monomer, 0.5 to 400 portions of weather-resistant monomer, 0.5 to 450 portions of main monomer, 0.2 to 20 portions of silane coupling agent, 0.2 to 10 portions of initiator, 0.2 to 10 portions of PH buffering agent, 0.2 to 10 portions of defoaming agent, 0.01 to 1 portion of preservative and 2 to 10 portions of pH regulator; the weather-resistant emulsion has the advantages of long aging resistance time, good aging resistance effect, good cracking resistance, good water resistance, ultraviolet resistance, good solvent resistance, stable storage and long service life.
Description
Technical Field
The invention belongs to the technical field of exterior wall coatings, relates to an emulsion, a preparation method and application thereof, and particularly relates to a weather-resistant emulsion, and a preparation method and application thereof.
Background
With the development of society and the progress of science and technology, the living standard of people is higher and higher, the requirement on housing conditions is higher and higher, and therefore the requirement on the building industry is higher and higher. The building coating has important application in the building industry, not only can beautify buildings, but also has good protection effect on walls.
The aging resistant time of the general excellent products of the existing exterior wall coatings on the market is 600h, and some products can not reach the aging resistant time. However, the requirement of the exterior wall coating in the actual construction and living requirements is far higher than the requirement, and the requirement reaches more than 1000h, and 1500h-2000h is better. The lower aging resistance is a serious defect of the exterior wall coating on the market at present, which not only seriously influences the service life of the exterior wall coating, but also increases the cost of users or enterprises in the aspect of the exterior wall coating. The development of the society and the pursuit of people for the quality of life make requirements for the improvement of the performance of the exterior wall coating, and the development of the exterior wall coating with good aging resistance is urgently needed. The organosilicon monomer modification technology has good weather resistance, but has high cost, poor film forming property and easy cracking. Fluorocarbon emulsions are excellent in weather resistance, but very poor in stain resistance and extremely high in cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the weather-resistant emulsion which has the advantages of long aging resistance time, good aging resistance effect, good cracking resistance, good water resistance, ultraviolet resistance, good solvent resistance, stable storage and long service life, and the preparation method and the application of the weather-resistant emulsion.
The technical scheme adopted by the invention is as follows:
the weather-resistant emulsion comprises the following components in parts by weight: 400 portions of deionized water, 1 to 50 portions of reactive emulsifier, 0.5 to 50 portions of hydrophilic monomer, 0.5 to 100 portions of functional monomer, 0.5 to 400 portions of weather-resistant monomer, 0.5 to 450 portions of main monomer, 0.2 to 20 portions of silane coupling agent, 0.2 to 10 portions of initiator, 0.2 to 10 portions of pH buffer agent, 0.2 to 10 portions of defoaming agent, 0.01 to 1 portion of preservative and 2 to 10 portions of pH regulator; the hydrophilic monomer is one or more than two of acrylic acid, methacrylic acid, acrylonitrile, isobornyl acrylate, maleic acid, glycidyl methacrylate, acrylamide and methacrylamide; the functional monomer is one or more than two of n-butyl methacrylate, tert-butyl acrylate and tert-butyl methacrylate; the weather-resistant monomer is one or more than two of cyclohexyl acrylate and 2-cyclohexyl methacrylate; the main monomer is one or more than two of styrene, methyl methacrylate, butyl acrylate and 2-ethylhexyl acrylate.
The reactive emulsifier is one or more than two of allyl ammonium alkyl sulfate, allyl-containing ammonium alcohol ether sulfate, allyl-containing sodium alcohol ether sulfate, allyl alkyl sodium sulfosuccinate diester, alkyl propenyl phenoxy polyether ammonium sulfate, 2-allyl ether-3-hydroxy propane-1-sodium sulfonate, acrylamide isopropyl sodium sulfonate, double bond-containing sodium sulfosuccinate diester, allyl isomeric tridecyl sodium sulfate and allyl undecyl sodium sulfosuccinate amyl sulfosuccinate.
The silane coupling agent is one or more than two of vinyl triethoxysilane, vinyl trimethoxysilane and gamma- (methacryloyloxy) propyl trimethoxysilane.
The initiator is one or more than two of potassium persulfate, ammonium persulfate and sodium persulfate.
The pH buffer is sodium carbonate or sodium bicarbonate、One or more of ammonium carbonate and ammonium bicarbonate.
The pH regulator is one or more than two of ammonia water, sodium hydroxide and potassium hydroxide.
The preparation method of the weather-resistant emulsion comprises the following steps:
step 1, weighing the components according to the raw material proportion as defined in claim 1;
step 2, dissolving the reactive emulsifier by adopting 200 parts of deionized water and 240 parts of water to obtain an emulsifier solution;
step 3, mixing a hydrophilic monomer, a functional monomer, a weather-resistant monomer, a silane coupling agent and a main monomer, and adding the mixture into the emulsifier solution under the stirring condition for dispersion to obtain a dispersion liquid;
step 4, adding 240 parts of water 200 and pH buffer agent into a reactor, heating to 80-88 ℃ under the stirring condition, adding 1-10 wt% of the dispersion liquid and 10-30 wt% of initiator into the reactor at one time, and reacting to obtain seed liquid;
and 5, dissolving the rest of the initiator by using the balance of deionized water to obtain an initiator solution, then dropwise adding the initiator solution and the rest of the dispersion liquid into the seed liquid, dropwise adding the initiator solution and the rest of the dispersion liquid for 300min at the temperature of 82-88 ℃, preserving the heat for 60-180min after the dropwise adding is finished, cooling to the temperature below 50 ℃, adding a pH regulator, a defoaming agent and a preservative, and uniformly stirring to obtain the weather-resistant emulsion.
Use of a weatherable emulsion as described above in exterior wall coatings.
The application of the weather-resistant emulsion in the exterior wall coating comprises the following components in parts by weight: 10-25 parts of water, 1-5 parts of film-forming auxiliary agent alcohol ester, 0.1-1 part of metal soap defoamer, 0.1-1 part of organic silicon defoamer, 0.1-1 part of sodium salt dispersant, 1-5 parts of propylene glycol, 0.1-0.5 part of wetting agent, 10-25 parts of rutile titanium dioxide, 10-30 parts of 700-mesh heavy calcium carbonate, 5-10 parts of 1250-mesh calcined kaolin, 0.1-1 part of hydroxyethyl cellulose, 0.1-1 part of ammonia water, 20-50 parts of the weather-resistant emulsion described in claim 1, 0.1-1 part of Kathon bactericide, 0.1-1 part of mineral oil defoamer and 0.1-1 part of hydrophobic modified alkali swelling thickener.
The invention has the beneficial effects that: a kind of weather resistant latex, use the reactive emulsifier to participate in the reaction and realize the soap-free polymerization, reactive emulsifier, functional monomer, weather resistant monomer, can increase water resistance and solvent resistance, can also improve cohesion and toughness of the emulsion membrane, reduce the crackle, thus improve the outdoor life-span of use; the hydrophilic monomer provides colloid stability in the reaction, and is matched with the weather-resistant monomer to assist a dispersing agent and a wetting agent to stabilize powder in the coating, and the cyclic side chain of the weather-resistant monomer is matched with the hydrophilic monomer to resist the attack of ultraviolet rays, so that the problem of paint film pulverization is greatly reduced; the silicon-oxygen bond of the silane coupling agent is condensed with the pigment, the base material and the silicon-oxygen bond of the silane coupling agent, so that the crosslinking density of the latex film is further improved, and the water resistance of the paint film is improved; the functional monomer, the weather-resistant monomer and the silane coupling agent are used together, and the reactive emulsifier is used, so that the emulsion has excellent aging resistance, stain resistance, water resistance and solvent resistance, and the long-term protection and decoration effects of the exterior wall coating are really realized; the functional monomer, the weather-resistant monomer and the like are used in a matching way, so that the paint is ageing-resistant and cracking-resistant, and the dosage of the silane coupling agent can be reduced.
Compared with the prior art, the preparation method of the weather-resistant emulsion has the advantages that the silane coupling agent, the functional monomer, the tough monomer and the weather-resistant monomer are introduced in the preparation process, and through the matching of the raw material components and the preparation method, the crosslinking density of the emulsion film can be further improved in the emulsion film forming process, and the water resistance of the paint film is improved.
The exterior wall coating prepared from the weather-resistant emulsion has excellent water resistance, aging resistance, cracking resistance, weather resistance, stain resistance and solvent resistance, and is stable in storage and long in service life.
Detailed Description
The invention provides a weather-resistant emulsion which has the advantages of long aging resistance time, good cracking resistance, good aging resistance effect, good water resistance, ultraviolet resistance, good solvent resistance, stable storage and long service life, and a preparation method and application of the weather-resistant emulsion.
The present invention will be further described with reference to the following specific examples. The ammonium allylundecanol sulfate used in this example was SR-10 of Adeca, and the ammonium alkylphenylphenoxy polyether sulfate was SE-10N of Adeca.
Detailed description of the preferred embodiments
I. Weather-resistant emulsion
The contents of the components are shown in table 1 below.
Table 1:
the preparation method of the weather-resistant emulsion comprises the following steps:
step 1, weighing the components according to the raw material ratio;
step 2, dissolving a reactive emulsifier by using 200 parts of deionized water to obtain an emulsifier solution;
step 3, mixing a hydrophilic monomer, a functional monomer, a weather-resistant monomer, a silane coupling agent and a main monomer, and adding the mixture into the emulsifier solution under the stirring condition for dispersion to obtain a dispersion liquid;
step 4, adding 250 parts of deionized water and a pH buffering agent into a reactor, heating to 82 ℃ under the stirring condition, stabilizing for 15min, adding 10 wt% of the dispersion liquid and 30 wt% of an initiator into the reactor at one time, and reacting for 20min to obtain a seed liquid;
and 5, dissolving the rest of the initiator by using the rest of deionized water to obtain an initiator solution, dropwise adding the initiator solution and the rest of the dispersion liquid into the seed liquid for 240min, keeping the temperature for 120min after dropwise adding, cooling to below 50 ℃ after heat preservation, adjusting the pH to 7-8 by using ammonia water, adding a defoaming agent and a preservative, and uniformly stirring to obtain the weather-resistant emulsion.
Example 11
A weather-resistant emulsion comprises, by weight, 400 parts of deionized water, 1 part of allyl isomeric tridecyl sodium sulfate, 0.2 part of acrylic acid, 0.3 part of methacrylic acid, 0.5 part of n-butyl methacrylate, 400 parts of cyclohexyl acrylate, 95 parts of methyl methacrylate, 50 parts of butyl acrylate, 50 parts of 2-isooctyl acrylate, 0.2 part of vinyltriethoxysilane, 0.2 part of potassium persulfate, 0.2 part of sodium bicarbonate, 0.2 part of a defoaming agent, 0.2 part of a preservative and 2 parts of ammonia water.
A weatherable emulsion as described in this example was prepared by the following method, including the steps:
step 1, weighing the components according to the raw material ratio;
step 2, dissolving the allyl isomeric tridecyl sodium sulfate by using deionized water to obtain an allyl isomeric tridecyl sodium sulfate solution;
step 3, mixing acrylic acid, methacrylic acid, n-butyl methacrylate, cyclohexyl acrylate, vinyl triethoxysilane, methyl methacrylate, butyl acrylate and 2-isooctyl acrylate, and adding the mixture into the allyl isomeric tridecyl sodium sulfate solution under the condition of stirring for dispersion to obtain a dispersion liquid;
step 4, adding water and sodium bicarbonate into a reactor, heating to 80 ℃ under the stirring condition, adding 1 wt% of the dispersion liquid and 10 wt% of potassium persulfate into the reactor, and reacting to obtain seed liquid;
and 5, dissolving the rest potassium persulfate with water to obtain an initiator solution, then dropwise adding the initiator solution and the rest dispersed solution into the seed solution, wherein the dropwise adding time is 240min, the dropwise adding temperature is 85 ℃, keeping the temperature for 60min after the dropwise adding is finished, cooling to below 50 ℃, adding ammonia water to adjust the pH value to 7-8, then adding a defoaming agent and a preservative, and uniformly stirring to obtain the weather-resistant emulsion.
Example 12
A weather-resistant emulsion comprises, by weight, 400 parts of deionized water, 1 part of allyl undecyl polyether (10EO) ammonium sulfate, 0.3 part of acrylonitrile, 0.2 part of acrylamide, 0.1 part of tert-butyl acrylate, 0.4 part of tert-butyl methacrylate, 145 parts of 2-cyclohexyl methacrylate, 200 parts of styrene, 200 parts of 2-ethylhexyl acrylate, 50 parts of butyl acrylate, 0.2 part of vinyl trimethoxy silane, 0.2 part of ammonium persulfate, 0.2 part of sodium carbonate, 0.2 part of a defoaming agent, 0.2 part of a preservative and 2 parts of ammonia water.
A weatherable emulsion as described in this example was prepared by the following method, including the steps:
step 1, weighing the components according to the raw material ratio;
step 2, dissolving ammonium sulfate of allyl undecyl alcohol polyether (10EO) by using deionized water to obtain an allyl-containing ammonium sulfate solution of undecyl alcohol ether (10 EO);
step 3, mixing acrylonitrile, acrylamide, tert-butyl acrylate, tert-butyl methacrylate, 2-cyclohexyl methacrylate, vinyl trimethoxy silane, styrene, 2-ethylhexyl acrylate and butyl acrylate, and adding the mixture into the allyl undecyl polyether (10EO) ammonium sulfate solution under the condition of stirring for dispersion to obtain a dispersion liquid;
step 4, adding water and sodium bicarbonate into a reactor, heating to 85 ℃ under the stirring condition, adding 5 wt% of the dispersion liquid and 20 wt% of ammonium persulfate into the reactor, reacting for 20min, and obtaining seed liquid;
and 5, dissolving the remaining ammonium persulfate to obtain an initiator solution, then dropwise adding the initiator solution and the remaining dispersion liquid into the seed liquid, wherein the dropwise adding time is 240min, the dropwise adding temperature is 88 ℃, keeping the temperature for 60min after the dropwise adding is finished, cooling to below 50 ℃, adding ammonia water to adjust the pH value to 7-8, adding a defoaming agent and a preservative, and uniformly stirring to obtain the weather-resistant emulsion.
Example 13
A weather-resistant emulsion comprises, by weight, 500 parts of deionized water, 25 parts of 2-allyl ether-3-hydroxypropane-1-sodium sulfonate, 25 parts of acrylamido isopropyl sodium sulfonate, 10 parts of acrylamide, 40 parts of methacrylamide, 50 parts of n-butyl methacrylate, 10 parts of tert-butyl methacrylate, 40 parts of tert-butyl acrylate, 237 parts of cyclohexyl acrylate, 10 parts of butyl acrylate, 10 parts of gamma- (methacryloyloxy) propyl trimethoxy silane, 5 parts of vinyl triethoxy silane, 5 parts of ammonium persulfate, 5 parts of sodium persulfate, 5 parts of ammonium carbonate, 5 parts of ammonium bicarbonate, 10 parts of a defoaming agent, 1 part of a preservative and 2 parts of potassium hydroxide.
A weatherable emulsion as described in this example was prepared by the following method, including the steps:
step 1, weighing the components according to the raw material ratio;
step 2, dissolving 2-allyl ether-3-hydroxy propane-1-sodium sulfonate and acrylamide isopropyl sodium sulfonate by adopting deionization to obtain a mixed solution of the 2-allyl ether-3-hydroxy propane-1-sodium sulfonate and the acrylamide isopropyl sodium sulfonate;
step 3, mixing acrylamide, methacrylamide, n-butyl methacrylate, tert-butyl acrylate, cyclohexyl acrylate, gamma- (methacryloyloxy) propyl trimethoxy silane, vinyl triethoxy silane and butyl acrylate, adding the mixture into the mixed solution of the 2-allyl ether-3-hydroxy propane-1-sodium sulfonate and the acrylamide isopropyl sodium sulfonate under the stirring condition, and dispersing to obtain a dispersion liquid;
step 4, adding water, ammonium carbonate and ammonium bicarbonate into a reactor, heating to 88 ℃ under the stirring condition, stabilizing for 15min, adding 10 wt% of the dispersion, 30 wt% of sodium persulfate and ammonium persulfate into the reactor, and reacting for 20min to obtain seed liquid;
and 5, dissolving the rest sodium persulfate and the rest ammonium persulfate to obtain an initiator solution, then dropwise adding the initiator solution and the rest dispersion liquid into the seed liquid for 240min, wherein the dropwise adding temperature is 88 ℃, preserving heat for 180min after the dropwise adding is finished, cooling to below 50 ℃, adding potassium hydroxide to adjust the pH value, adding a defoaming agent and a preservative, and uniformly stirring to obtain the weather-resistant emulsion.
Example 14
A weather-resistant emulsion comprises, by weight, 450 parts of deionized water, 25 parts of acrylamido isopropyl sodium sulfonate, 5 parts of isobornyl acrylate, 10 parts of maleic acid, 10 parts of glycidyl methacrylate, 50 parts of tert-butyl methacrylate, 100 parts of cyclohexyl acrylate, 100 parts of 2-cyclohexyl methacrylate, 219.5 parts of methyl methacrylate, 10 parts of vinyl trimethoxy silane, 5 parts of potassium persulfate, 5 parts of ammonium carbonate, 5 parts of an antifoaming agent, 0.5 part of a preservative, 2 parts of sodium hydroxide and 3 parts of potassium hydroxide.
A weatherable emulsion as described in this example was prepared by the following method, including the steps:
step 1, weighing the components according to the raw material ratio;
step 2, dissolving acrylamide sodium isopropyl sulfonate by using deionized water to obtain an acrylamide sodium isopropyl sulfonate solution;
step 3, mixing isobornyl acrylate, maleic acid, glycidyl methacrylate, tert-butyl methacrylate, cyclohexyl acrylate, 2-cyclohexyl methacrylate, vinyl trimethoxy silane and methyl methacrylate, and adding the mixture into the acrylamido isopropyl sodium sulfonate solution under the stirring condition for dispersion to obtain a dispersion liquid;
step 4, adding water and ammonium carbonate into a reactor, heating to 85 ℃ under the stirring condition, adding 1 wt% of the dispersion and 20 wt% of potassium persulfate into the reactor, and reacting to obtain seed liquid;
and 5, dissolving the rest potassium persulfate to obtain an initiator solution, then dropwise adding the initiator solution and the rest dispersed solution into the seed solution, wherein the dropwise adding time is 240min, the dropwise adding temperature is 82 ℃, keeping the temperature for 150min after the dropwise adding is finished, cooling to below 50 ℃, adding sodium hydroxide and potassium hydroxide to adjust the pH value, adding a defoaming agent and a preservative, and uniformly stirring to obtain the weather-resistant emulsion.
Example 15
A weather-resistant emulsion comprises 419 parts of deionized water, 20 parts of isomeric tridecyl propenyl phenoxy polyether sodium sulfate, 10 parts of allyl undecyl polyether (10EO) ammonium sulfate, 20 parts of isomeric tridecyl propenyl phenoxy polyether ammonium sulfate, 5 parts of glycidyl methacrylate, 5 parts of acrylic acid, 40 parts of methacrylic acid, 100 parts of tert-butyl methacrylate, 200 parts of cyclohexyl acrylate, 120 parts of methyl methacrylate, 20 parts of vinyl trimethoxy silane, 10 parts of potassium persulfate, 10 parts of ammonium carbonate, 10 parts of a defoaming agent, 1 part of a preservative, 1 part of ammonia water, 4 parts of sodium hydroxide and 5 parts of potassium hydroxide.
A weatherable emulsion as described in this example was prepared by the following method, including the steps:
step 1, weighing the components according to the raw material ratio;
step 2, dissolving isomeric tridecyl propenyl phenoxy polyether sodium sulfate, allyl undecyl polyether (10EO) ammonium sulfate and isomeric tridecyl propenyl phenoxy polyether ammonium sulfate by using deionized water to obtain a mixed solution of isomeric tridecyl propenyl phenoxy polyether sodium sulfate, allyl undecyl polyether (10EO) ammonium sulfate and isomeric tridecyl propenyl phenoxy polyether ammonium sulfate;
step 3, mixing glycidyl methacrylate, acrylic acid, methacrylic acid, tert-butyl methacrylate, cyclohexyl acrylate, vinyl trimethoxy silane and methyl methacrylate, and adding the mixture into a mixed solution of the isomeric tridecyl propenyl phenoxy polyether sodium sulfate, allyl undecyl polyether (10EO) ammonium sulfate and the isomeric tridecyl propenyl phenoxy polyether ammonium sulfate under the condition of stirring for dispersion to obtain a dispersion liquid;
step 4, adding water and ammonium carbonate into a reactor, heating to 85 ℃ under the stirring condition, adding 1 wt% of the dispersion and 20 wt% of potassium persulfate into the reactor, and reacting to obtain seed liquid;
and 5, dissolving the rest potassium persulfate to obtain an initiator solution, then dropwise adding the initiator solution and the rest dispersed solution into the seed solution for 260min at 86 ℃, keeping the temperature for 150min, cooling to below 50 ℃, adding ammonia water, sodium hydroxide and potassium hydroxide to adjust the pH value to 7-8, adding a defoaming agent and a preservative, and uniformly stirring to obtain the weather-resistant emulsion.
II exterior wall coating
To better illustrate the characteristics of the weatherable emulsions provided by the examples of the present invention, exterior wall coatings were prepared using the weatherable emulsions described in examples 1 to 15 as the base. The specific components and the amounts of the exterior wall coating are shown in tables 2-3.
Table 2:
TABLE 3
Second, Effect experiment
1. The weatherable emulsions prepared in examples 1 to 15 and the exterior coatings prepared from the weatherable emulsions were tested for their properties, the weatherable emulsions for exterior walls were as shown in Table 4, the emulsions were as shown in Table 5, and the coatings were as shown in tables 6 and 7 for their basic physical properties and properties:
table 4:
table 5:
table 6:
table 7:
2. influence of raw material selection and proportion of emulsion on prepared exterior wall coating
To better illustrate the characteristics of the weather-resistant emulsion provided by the embodiment of the present invention, the emulsion in embodiment 4 is selected as an example, and the preparation method of the weather-resistant emulsion and the content of the exterior wall coating components of the present invention are taken as test examples:
comparative example 1: the external wall coating is prepared from the common styrene-acrylic emulsion.
Table 8: the amounts of the components of the exterior wall coatings of the experimental example and the comparative example
The comparative performance of the prepared exterior wall coating is as follows 8-10:
table 9:
table 10:
table 11:
note: detecting the mechanical stability and the calcium ion stability of the emulsion (0.5 percent of CaCl)2Solution), the total residual monomers and the storage stability are determined according to the detection method of the national standard GB/T20623-2006. The properties of the coatings were determined according to the test method GB/T9755-2014, where the water resistance test was 48h longer than the standard method.
As can be seen from tables 8 to 11, the emulsions of the present invention have good stability and good resistance to weathering. As can be seen from tables 6 and 7, the weather-resistant monomer, the hydrophilic monomer, the dispersing agent, the wetting agent and the silane coupling agent are matched, so that powder in the paint can be stabilized, and the outer wall paint is not easy to discolor; the weather-resistant monomer (such as cyclohexyl acrylate) is matched with the functional monomer (such as n-butyl methacrylate), so that the finally prepared exterior wall coating has excellent aging resistance and cracking resistance, and the combination of the functional monomer and the weather-resistant monomer can improve the cohesion and toughness of an emulsion film and reduce the use of a silane coupling agent. The weather-resistant monomer, the functional monomer, the matching and combination with other components, the raw material dosage proportion and the preparation method finally ensure that the coating prepared by the emulsion has outstanding aging resistance, particularly the artificial weather aging resistance is obviously superior to that of the comparative example 1, the stain resistance is excellent, and the storage stability, the water resistance and the alkali resistance are also superior to that of the comparative example 1. Excellent comprehensive performance and very high application prospect in the field of exterior wall coatings.
Claims (9)
1. The weather-resistant emulsion is characterized by comprising the following components in parts by weight: 400 portions of deionized water, 1 to 50 portions of reactive emulsifier, 0.5 to 50 portions of hydrophilic monomer, 0.5 to 100 portions of functional monomer, 0.5 to 400 portions of weather-resistant monomer, 0.5 to 450 portions of main monomer, 0.2 to 20 portions of silane coupling agent, 0.2 to 10 portions of initiator, 0.2 to 10 portions of pH buffer agent, 0.2 to 10 portions of defoaming agent, 0.01 to 1 portion of preservative and 2 to 10 portions of pH regulator; the hydrophilic monomer is one or more than two of acrylic acid, methacrylic acid, acrylonitrile, isobornyl acrylate, maleic acid, glycidyl methacrylate, acrylamide and methacrylamide; the functional monomer is one or more than two of n-butyl methacrylate, tert-butyl acrylate and tert-butyl methacrylate; the weather-resistant monomer is one or more than two of cyclohexyl acrylate and 2-cyclohexyl methacrylate; the main monomer is one or more than two of styrene, methyl methacrylate, butyl acrylate, 2-isooctyl acrylate and 2-ethylhexyl acrylate.
2. The weatherable emulsion according to claim 1, wherein: the reactive emulsifier is one or more than two of allyl ammonium alkyl sulfate, allyl-containing ammonium alcohol ether sulfate, allyl-containing sodium alcohol ether sulfate, allyl alkyl sodium sulfosuccinate diester, alkyl propenyl phenoxy polyether ammonium sulfate, 2-allyl ether-3-hydroxy propane-1-sodium sulfonate, acrylamide isopropyl sodium sulfonate, double bond-containing sodium sulfosuccinate diester, allyl isomeric tridecyl sodium sulfate and allyl undecyl sodium sulfosuccinate amyl sulfosuccinate.
3. The weatherable emulsion according to claim 1, wherein: the silane coupling agent is one or more than two of vinyl triethoxysilane, vinyl trimethoxysilane and gamma- (methacryloyloxy) propyl trimethoxysilane.
4. The weatherable emulsion according to claim 1, wherein: the initiator is one or more than two of potassium persulfate, ammonium persulfate and sodium persulfate.
5. The weatherable emulsion according to claim 1, wherein: the pH buffer is sodium carbonate or sodium bicarbonate、One or more of ammonium carbonate and ammonium bicarbonate.
6. The weatherable emulsion according to claim 1, wherein: the pH regulator is one or more than two of ammonia water, sodium hydroxide and potassium hydroxide.
7. The method of claim 1, comprising the steps of:
step 1, weighing the components according to the raw material proportion as defined in claim 1;
step 2, dissolving the reactive emulsifier by using 200 and 240 parts of deionized water to obtain an emulsifier solution;
step 3, mixing a hydrophilic monomer, a functional monomer, a weather-resistant monomer, a silane coupling agent and a main monomer, and adding the mixture into the emulsifier solution under the stirring condition for dispersion to obtain a dispersion liquid;
step 4, adding 240 parts of water 200 and pH buffer agent into a reactor, heating to 80-88 ℃ under the stirring condition, adding 1-10 wt% of the dispersion liquid and 10-30 wt% of initiator into the reactor, and reacting for 20min to obtain seed liquid;
and 5, dissolving the rest of the initiator by using the rest of deionized water to obtain an initiator solution, then dropwise adding the initiator solution and the rest of the dispersion liquid into the seed liquid for 300min at the dropwise adding temperature of 82-88 ℃, preserving heat for 60-180min after dropwise adding is finished, cooling to below 50 ℃, adding a pH regulator, a defoaming agent and a preservative, and uniformly stirring to obtain the weather-resistant emulsion.
8. Use of the weatherable emulsion of claim 1 in exterior wall coatings.
9. Use of the weatherable emulsion of claim 8 in exterior wall coatings characterized by: the exterior wall coating comprises the following components in parts by weight: 10-25 parts of water, 1-5 parts of film-forming auxiliary agent alcohol ester, 0.1-1 part of metal soap defoamer, 0.1-1 part of organic silicon defoamer, 0.1-1 part of sodium salt dispersant, 1-5 parts of propylene glycol, 0.1-0.5 part of wetting agent, 10-25 parts of rutile titanium dioxide, 10-30 parts of 700-mesh heavy calcium carbonate, 5-10 parts of 1250-mesh calcined kaolin, 0.1-1 part of hydroxyethyl cellulose, 0.1-1 part of ammonia water, 20-50 parts of the weather-resistant emulsion described in claim 1, 0.1-1 part of Kathon bactericide, 0.1-1 part of mineral oil defoamer and 0.1-1 part of hydrophobic modified alkali swelling thickener.
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| CN112608637A (en) * | 2021-01-14 | 2021-04-06 | 贾琛 | Preparation method of high-water-resistance steel structure water-based fireproof coating |
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