Art coating Yayanite emulsion easy to construct as well as preparation method and application of artistic coating Yayanite emulsion

Abstract

The invention discloses an easy-to-construct artistic coating Yayanite emulsion as well as a preparation method and application thereof. The emulsion is prepared from the following monomer components in percentage by weight, and the total mass of the components is 100%: a) 15-70%, preferably 44-66%, of unsaturated acid ester monomers; b) 14-25%, preferably 10-15%, of a foaming functional monomer; c) 0.5%-5%, preferably 1%-5%, of an unsaturated hydrophilic monomer; d) 0.2 to 5%, preferably 0.5 to 2%, of a reactive silane coupling agent; e) from 10% to 50%, preferably from 20% to 30%, of styrene. The emulsion provided by the invention is easier to form bubbles under the action of paint-free spraying high shear force, and a paint film is endowed with smooth feeling during construction, so that the paint film is easier to form textures, and the construction efficiency of the paint is greatly improved.

Description

Technical Field

[0001] The invention relates to an acrylic emulsion, in particular to an easy-to-apply artistic coating, a crystal stone emulsion, and a preparation method and application thereof. Background Art

[0002] Artistic paint is an interior paint decoration that has emerged in recent years. Interior paint is an important part of interior design and interior decoration. With the improvement of people's living standards, there are more and more artistic pursuits for the style of interior decoration, hoping to add more artistic elements. Therefore, artistic paint has gradually produced a variety of post-processing forms such as rubbing texture and polishing, which puts higher requirements on Yajing Stone paint which is mainly based on hard aggregate.

[0003] Traditional Yajingshi paint is difficult to construct due to the large amount of aggregate added to the system, especially in the design of scraping and the later texture polishing, which are very difficult for construction workers. Such operations often require that the viscosity of the paint should not be too high, otherwise it will be difficult to scrape, and the viscosity of the paint should not be too low, otherwise it will have poor flowability.

[0004] Patent CN115232557A introduces an easy-to-apply Yajingshi paint prepared by a high thixotropic system using modified urea and HK-10 cellulose, which effectively improves the applicability. However, the modified urea has a high cost and is very likely to produce amine odor under a high pH system.

[0005] Patent CN213449234U introduces the operation of increasing the smoothness of scraping by using a non-woven fabric layer, but this method still has the problem of increasing the construction process. Summary of the invention

[0006] In order to solve the above technical problems, the present invention proposes an easy-to-apply artistic coating, a crystal stone emulsion, and a preparation method and application thereof.

[0007] According to one aspect of the present invention, firstly, an easy-to-apply artistic coating, Yajingshi emulsion, is provided, to which a foaming functional monomer with a special structure is added. The monomer structure has a large number of maleimide and amide bonds. The high reactivity rate of maleimide can make the monomer evenly distributed in the polymer chain segment. The electron donating ability of the N atom makes the amide bond and the acrylic monomer have stronger reactivity to produce cross-linking, which is conducive to the generation of bubbles under high shear. Compared with traditional amide monomer acrylic polymers, the system has higher viscosity and foaming properties, and can simultaneously meet the construction requirements of smoothness and no sag in scraping.

[0008] According to another aspect of the present invention, a method for preparing an easy-to-apply artistic paint emulsion of Yajingshi is also provided. The preparation of the emulsion is applicable to a general emulsion polymerization method, and has the advantages of simple operation and good device adaptability.

[0009] According to another aspect of the present invention, there is also provided an application of an easy-to-apply artistic paint, Yajingshi emulsion, in paint, which can meet higher construction requirements.

[0010] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0011] An easy-to-apply artistic coating, Yajingshi emulsion, characterized in that the emulsion is prepared from the following monomer components in the following weight ratios, with the total weight of these components being 100%:

[0012] a) 15-70%, preferably 44-66%, of unsaturated acid ester monomers;

[0013] b) 14-25%, preferably 10-15%, of a foaming functional monomer;

[0014] c) 0.5-5%, preferably 1-5%, of an unsaturated hydrophilic monomer;

[0015] d) 0.2-5%, preferably 0.5-2%, of a reactive silane coupling agent;

[0016] e) 10-50%, preferably 20-30%, of styrene;

[0017] Component b) has the following structural expression:

[0018]

[0019] As a preferred solution of the present invention, component b) is prepared by the reaction of maleic anhydride and glycine amide, but the preparation method of the component should not be used as any limitation to the present invention.

[0020]

[0021] In the steps of the above-mentioned synthesis process, the molar ratio of maleic anhydride to glycine amide is 1:(1.2-1.5).

[0022] Furthermore, the reaction conditions of step A are reaction temperature of 0-25° C. and reaction time of 0.5-2 h.

[0023] As a preferred embodiment of the present invention, component a) is selected from alkyl acrylates having 1 to 16 carbon atoms, allyl esters, vinyl acetate and methyl substitutes thereof, preferably selected from alkyl acrylates having 1 to 8 carbon atoms, vinyl acetate and methyl substitutes thereof, more preferably selected from one or more of methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, methyl 2-methacrylate, isopentyl methacrylate and heptyl methacrylate.

[0024] As a preferred embodiment of the present invention, component c) is selected from unsaturated monomers containing hydrophilic groups, and the hydrophilic groups include at least one of carboxyl groups, hydroxyl groups, amide groups, sulfonic acid groups, phosphate groups, urea groups, sulfonate groups, sulfate groups, and phosphate groups; preferably, component c) is selected from one or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, acrylamide, methacrylamide, ethyl ethylene urea, vinyl alkoxy phosphate, and sodium 2-acrylamide-2-methylpropane sulfonate;

[0025] As a preferred embodiment of the present invention, component d) is selected from silane coupling agents containing vinyl or epoxy functional groups, preferably one or more of vinyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-glycidyloxypropyltrimethoxysilane, and mercaptopropyltrimethoxysilane.

[0026] As a preferred solution of the present invention, the solid content of the emulsion is 40-50%, the pH is 7-9, and the particle size of the emulsion is 69-80 nm.

[0027] The present invention also provides a method for preparing the easy-to-apply artistic coating Yajingshi emulsion as described above, comprising the following steps:

[0028] 1) uniformly mixing components a), b), c), d), e), water and an emulsifier to prepare a pre-emulsion;

[0029] 2) preparing the initiator as a dropwise initiator and a bottom initiator; wherein the dropwise initiator accounts for 25-50% of the total mass of the initiator;

[0030] 3) Mix the neutralizer, emulsifier and water to prepare the bottom liquid and add it into the reactor, raise the temperature to 80-90°C, start adding part of the pre-emulsified liquid, add the bottom initiator after stirring evenly, react for 10-20 minutes, and obtain the seed emulsion;

[0031] 4) Continue to add the remaining pre-emulsion and the initiator to the seed emulsion, the addition time is 2-4 hours, and then keep warm for 20-60 minutes;

[0032] 5) Cool the reactor to 70-80°C, gradually add the post-treatment agent to the reactor for 2-4 hours, and then keep warm for 30-60 minutes;

[0033] 6) Cooling to below 45°C, adding a pH regulator to adjust the pH of the system to 7-9, and filtering and discharging the material after stripping;

[0034] Preferably, the pre-emulsion in step 3) accounts for 1-8% of the total mass.

[0035] As a preferred embodiment of the present invention, the mass ratio of the emulsifier in step 1) and step 3) is (90-99.5):(0.5-10);

[0036] Preferably, the total amount of the emulsifier is 1-5%, preferably 1-2%, of the total mass of components a)-e);

[0037] Preferably, the emulsifier is selected from one or more of sodium dodecyl sulfate, sodium p-styrene sulfonate, sodium dodecylbenzene sulfonate, alcohol ether sulfosuccinate, alkyl alcohol ether sulfate, and alkyl alcohol ether phosphate.

[0038] As a preferred embodiment of the present invention, the total amount of the initiator is 0.2-0.6% of the total mass of components a)-e), preferably 0.2-0.4%;

[0039] Preferably, the initiator is selected from one or more of sodium persulfate, potassium persulfate, and ammonium persulfate;

[0040] Preferably, the neutralizing agent is used in an amount of 0.1-4%, preferably 0.1-0.3%, of the total mass of monomer components a)-e);

[0041] Preferably, the neutralizing agent is selected from one or more of sodium bicarbonate, diethylenetriamine, diethanolamine, and ethanolamine.

[0042] As a preferred embodiment of the present invention, the total amount of the post-treatment agent is 0.15-0.6% of the total mass of components a)-e), preferably 0.2-0.4%;

[0043] Preferably, the post-treatment agent comprises an oxidant and a reducing agent, wherein the oxidant is selected from one or more of tert-butyl hydroperoxide, hydrogen peroxide, sodium persulfate, potassium persulfate, and ammonium persulfate; and the reducing agent is selected from one or more of sodium bisulfite, sodium pyrosulfite, and vitamin C;

[0044] The pH regulator is selected from one or more of diethylenetriamine, diethanolamine, and ethanolamine;

[0045] Preferably, the total amount of water used is 1-1.5 times, preferably 1-1.3 times, the total mass of components a)-e).

[0046] The stripping conditions are, for example: stripping temperature 55-85° C., pressure -75 KPa to -95 KPa gauge pressure.

[0047] The present invention also provides an application of the easy-to-apply artistic coating Yajingshi emulsion as described above or the easy-to-apply artistic coating Yajingshi emulsion prepared by the method described above in coatings.

[0048] The present invention uses a substance with a special structure as a foaming monomer, which participates in emulsion polymerization to make the polymer emulsion have a strong ability to generate bubbles, thereby increasing the construction performance of the jingshi paint and also increasing the low-temperature film-forming performance of the jingshi paint. Therefore, the acrylate emulsion of the present invention has the advantages of excellent construction performance, low-temperature film-forming performance, good environmental performance, etc., and is particularly suitable for use in the field of jingshi art paint for interior walls of buildings, and is simple to construct. DETAILED DESCRIPTION

[0049] The present invention is further described below by means of specific examples. The examples described in the present invention are only used to illustrate the present invention and do not limit the scope of the present invention.

[0050] The raw materials used in the following examples are shown in Table 1. Other raw materials are common commercially available unless otherwise specified:

[0051] Table 1. Raw material information

[0052]

[0053] The following processing procedures are adopted in the following embodiments:

[0054] Stripping: The emulsion is placed in a buffer kettle and preheated to 55°C, and then passed into a stripping tower for stripping (stripping temperature 55°C, pressure -79KPa); the emulsion is fed at the top of the tower, and the air and steam are fed at the bottom of the tower. The two are in countercurrent contact and mixed at high speed in a short time. The steam and air carry VOC components and separate from the emulsion through the vacuum tail gas pipeline, and the emulsion is discharged from the bottom. During the stripping process, the relative flow rates of air, steam and emulsion are 1:0.5:10.

[0055] Foaming test method: dilute the paint by 20%, spray the paint in a paintless sprayer, use two layers of putty during construction, the wet film thickness is about 300 microns, and observe whether there are bubble pits on the surface of the paint film after leaving it for 24 hours.

[0056] Paint film surface drying time test method: according to the method described in JG / T 24-2018 "Synthetic resin emulsion sand wall architectural coatings".

[0057] Water resistance test: According to the method described in JG / T 24-2018 "Synthetic resin emulsion sand wall architectural coatings".

[0058] Hardness: 1000μm paint film is cured for 7 days. Use your hand to scratch the paint film vigorously until no damage occurs.

[0059] [Preparation Example 1]

[0060] Prepare the foaming monomer as follows:

[0061] Maleic anhydride and glycine amide were mixed in a molar ratio of 1:1, methanol was added as a solvent, the reaction temperature was adjusted to 25° C., and the reaction was stirred for 24 hours.

[0062] After the reaction is completed, the temperature is lowered to 0 degrees Celsius, the product can be cooled and precipitated, and the product can be obtained by filtration.

[0063] 1 H NMR (300MHz, DMSO): δ4.59(s,2H),7.86(s,2H),9.72(t,2H).

[0064] [Example 1]

[0065] Prepare the ingredients according to the following recipe:

[0066] a) 625 g of butyl acrylate

[0067] b) 167 g foaming monomer

[0068] c) 14 g of acrylic acid

[0069] d) 5 g of γ-methacryloxypropyltrimethoxysilane

[0070] e) 183 g styrene

[0071] Separately prepare emulsifiers SDS 9.19 g, SSS 9 g, initiator APS 3 g, neutralizer sodium bicarbonate 2 g, post-treatment agent (t-BHP 2 g and 5% sodium bisulfite aqueous solution 40 g), water 1323 g, and pH adjuster diethylenetriamine in some amount.

[0072] Prepare the emulsion as follows:

[0073] 1) components a), b), c), d), e) and 433 g of water, 9 g of emulsifier SDS, and 9 g of emulsifier SSS were mixed uniformly to prepare a pre-emulsion;

[0074] 2) 1 g of initiator APS was fully mixed with 38 g of water to obtain a dropwise initiator; 2 g of initiator APS was fully mixed with 21 g of water to obtain a bottom initiator;

[0075] 3) 2g of sodium bicarbonate, 0.19g of emulsifier SDS and 831g of water were mixed and added to the reactor, stirred thoroughly, and heated to 85°C; 50g of pre-emulsion was added, and after stirring evenly, all the initiators at the bottom of the reactor were added, and the mixture was reacted for 10 minutes to obtain a seed emulsion;

[0076] 4) Control the temperature in the reactor to 85°C, continue to add the remaining pre-emulsion and all the dropwise initiators to the seed emulsion at the same time, the total dropwise addition time is 4 hours, and then keep warm for 2 minutes;

[0077] 5) Cool the reactor to 75°C, gradually add post-treatment agent (2 g t-BHP and 40 g 5% sodium bisulfite aqueous solution) into the reactor for 2 h, and then keep warm for 30 min;

[0078] 6) Cool down to below 45°C, add pH adjuster diethylenetriamine to adjust the pH of the system to 8, steam strip, filter with a 100-mesh filter, and discharge.

[0079] [Example 2-8]

[0080] Emulsions were prepared according to the same method as in Example 1, except that the raw material selection and dosage in each example were adjusted according to Table 2; at the same time, the amount of pre-emulsion added in step 3) accounted for 5% of the total mass.

[0081] [Comparative Example 1]

[0082] An acrylic emulsion was prepared in substantially the same manner as in Example 1, except that component b was not added.

[0083] [Comparative Example 2]

[0084] An acrylic emulsion was prepared in substantially the same manner as in Example 1, except that component b was replaced with N,N-methylenebisacrylamide.

[0085] The emulsions prepared in each embodiment and comparative example were used to prepare coatings according to the formula in Table 3, and the foaming, water resistance and hardness performance tests were performed. The results are shown in Table 4. The acrylic emulsions prepared in each comparative example were used to prepare coatings according to the formula in Table 3, and the foaming, water resistance and hardness performance tests were performed. The results are shown in Table 5.

[0086] As shown in Tables 4-5, the coatings prepared by the emulsions in the embodiments of the present invention have performance test results that meet the performance requirements of Yajingshi coatings, and the construction performance is significantly improved.

[0087] From the above results, it can be seen that by introducing a large number of amide groups into the emulsion resin, the foaming property of the coating can be improved and the construction performance of the coating can be further improved.

[0088] Table 2, raw material selection and dosage in Examples 1-8 (unit: g)

[0089]

[0090]

[0091] Table 3, coating formula

[0092]

[0093] Table 4. Test results of coating properties obtained from emulsions in the examples

[0094]

[0095] Table 5. Test results of coating properties obtained from emulsions in comparative examples

[0096] Comparative Example 1 Comparative Example 2 No caking No caking Paint container status good good Coating properties normal normal Coating appearance 2h 2h Paint film drying time (surface dry, h) 1 1 Spray foaming No bubbling, difficult to apply A small amount of foaming, difficult to apply Water resistance Poor Poor hardness Hand buckle sand Hand buckle sand .

Claims

1. An easy-to-apply artistic paint, Yajingshi emulsion. It is characterized in that The emulsion is prepared from the following monomer components in weight ratio, with the total weight of these components being 100%: a) 15-70%, preferably 44-66%, of unsaturated acid ester monomers; b) 14-25%, preferably 10-15%, of a foaming functional monomer; c) 0.5-5%, preferably 1-5%, of an unsaturated hydrophilic monomer; d) 0.2-5%, preferably 0.5-2%, of a reactive silane coupling agent; e) 10-50%, preferably 20-30%, of styrene; Component b) has the following structural expression:

2. The easy-to-apply art coating Yajingshi emulsion according to claim 1, It is characterized in that Component a) is selected from alkyl acrylates, allyl esters, vinyl acetate and methyl substitutes thereof having 1 to 16 carbon atoms, preferably selected from alkyl acrylates, vinyl acetate and methyl substitutes thereof having 1 to 8 carbon atoms, more preferably selected from one or more of methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, methyl 2-methacrylate, isopentyl methacrylate and heptyl methacrylate.

3. The easy-to-apply art coating Yajingshi emulsion according to claim 1, It is characterized in that Component c) is selected from unsaturated monomers containing hydrophilic groups, and the hydrophilic groups include at least one of carboxyl groups, hydroxyl groups, amide groups, sulfonic acid groups, phosphate groups, urea groups, sulfonate groups, sulfate groups, and phosphate groups; preferably, component c) is selected from one or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, acrylamide, methacrylamide, ethyl ethylene urea, vinyl alkoxy phosphate, and sodium 2-acrylamide-2-methylpropane sulfonate; 4. The easy-to-apply art coating Yajingshi emulsion according to claim 1, It is characterized in that Component d) is selected from silane coupling agents containing vinyl or epoxy functional groups, preferably one or more of vinyl trimethoxysilane, γ-methacryloxypropyl trimethoxysilane, γ-glycidyloxypropyl trimethoxysilane, and mercaptopropyl trimethoxysilane.

5. The easy-to-apply art coating Yajingshi emulsion according to any one of claims 1 to 4, It is characterized in that Component b) is prepared by the reaction of maleic anhydride and glycine amide.

6. A method for preparing the easy-to-apply artistic coating Yajingshi emulsion according to any one of claims 1 to 5, It is characterized in that The following steps are involved: 1) uniformly mixing components a), b), c), d), e), water and an emulsifier to prepare a pre-emulsion; 2) preparing the initiator as a dropwise initiator and a bottom initiator; wherein the dropwise initiator accounts for 25-50% of the total mass of the initiator; 3) Mix the neutralizer, emulsifier and water to prepare the bottom liquid and add it into the reactor, raise the temperature to 80-90°C, start adding part of the pre-emulsified liquid, add the bottom initiator after stirring evenly, react for 10-20 minutes, and obtain the seed emulsion; 4) Continue to add the remaining pre-emulsion and the initiator to the seed emulsion, the addition time is 2-4 hours, and then keep warm for 20-60 minutes; 5) Cool the reactor to 70-80°C, gradually add the post-treatment agent to the reactor for 2-4 hours, and then keep warm for 30-60 minutes; 6) Cooling to below 45°C, adding a pH regulator to adjust the pH of the system to 7-9, and filtering and discharging the material after stripping; Preferably, the pre-emulsion in step 3) accounts for 1-8% of the total mass.

7. The method for preparing the easy-to-apply art coating Yajingshi emulsion according to claim 6, It is characterized in that The mass ratio of the emulsifier in step 1) and step 3) is (90-99.5):(0.5-10); Preferably, the total amount of the emulsifier is 1-5%, preferably 1-2%, of the total mass of components a)-e); Preferably, the emulsifier is selected from one or more of sodium dodecyl sulfate, sodium p-styrene sulfonate, sodium dodecylbenzene sulfonate, alcohol ether sulfosuccinate, alkyl alcohol ether sulfate, and alkyl alcohol ether phosphate.

8. The method for preparing the easy-to-apply art coating Yajingshi emulsion according to claim 6 or 7, It is characterized in that The total amount of the initiator is 0.2-0.6% of the total mass of components a)-e), preferably 0.2-0.4%; Preferably, the initiator is selected from one or more of sodium persulfate, potassium persulfate, and ammonium persulfate; Preferably, the neutralizing agent is used in an amount of 0.1-4%, preferably 0.1-0.3%, of the total mass of monomer components a)-e); Preferably, the neutralizing agent is selected from one or more of sodium bicarbonate, diethylenetriamine, diethanolamine, and ethanolamine.

9. The method for preparing the easy-to-apply art coating Yajingshi emulsion according to claim 8, It is characterized in that The total amount of the post-treatment agent is 0.15-0.6% of the total mass of components a)-e), preferably 0.2-0.4%; Preferably, the post-treatment agent comprises an oxidant and a reducing agent, wherein the oxidant is selected from one or more of tert-butyl hydroperoxide, hydrogen peroxide, sodium persulfate, potassium persulfate, and ammonium persulfate; and the reducing agent is selected from one or more of sodium bisulfite, sodium pyrosulfite, and vitamin C; The pH regulator is selected from one or more of diethylenetriamine, diethanolamine, and ethanolamine; Preferably, the total amount of water used is 1-1.5 times, preferably 1-1.3 times, the total mass of components a)-e).

10. Use of the easy-to-apply art coating Yajingshi emulsion as described in any one of claims 1 to 5 or the easy-to-apply art coating Yajingshi emulsion prepared by the method described in any one of claims 6 to 9 in coatings.

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