A kind of latex paint and its preparation method and application

Abstract

The application discloses a latex paint and a preparation method and application thereof, and the latex paint comprises the following components in parts by weight: 3-6 parts of diatomite, 22-26 parts of modified titanium white powder, 0.8-1.2 parts of nano titanium dioxide, 30-40 parts of emulsion, 11-17 parts of filler, 5.6-12 parts of auxiliary agent and 14-18 parts of solvent. The modified titanium white powder is titanium dioxide grafted by a silane coupling agent and N-aminoethyl piperazine. The synergistic effect between the raw materials in the application can make the latex paint have excellent construction, weather resistance and aging resistance, storage stability, low-temperature resistance, acid and alkali resistance, water resistance and washing resistance and the like, and the latex paint in the application does not emit toxic and harmful gases such as VOC, formaldehyde and benzene during use, and does not contain heavy metals, so that low odor or even no odor can be realized, and the environment is protected and the body is not damaged.

Description

Technical Field

[0001] The invention belongs to the field of building materials, and in particular relates to a latex paint and a preparation method and application thereof. Background Art

[0002] At present, most of the latex paints on the market do not focus on the absorption and decomposition function of formaldehyde, and the anti-formaldehyde mechanism of a small part of the anti-formaldehyde latex paint is single, which cannot achieve the effect of short-term effective and long-term continuous anti-formaldehyde. Moreover, for the purpose of odor removal, the emulsion with low solid content is selected, and the paint film is not water-resistant, has poor water-proof performance, and is not excellent in scrubbing resistance, which easily causes the film appearance to be damaged. The main component of the latex paint on the market is styrene acrylic emulsion or other emulsions. Although the existing emulsions used for latex paints have advantages such as alkali resistance, oil resistance, water resistance, heat resistance, good adhesion, and transparent film, they are relatively poor in terms of aging resistance, weather resistance, and color retention, so it is necessary to improve the weather resistance and aging resistance of the latex paint. The conventional method for improving the weather resistance and aging resistance of interior wall latex paint on the market is to add weather resistance additives, stabilizers or select pigments and fillers with color, but this usually affects the comprehensive performance and the scope of use of coating, so it is urgent to strengthen the weather resistance and aging resistance of latex paint by other processing methods. Summary of the Invention

[0003] In order to overcome at least one technical problem existing in the above-mentioned prior art, one of the objectives of the present invention is to provide a modified titanium dioxide.

[0004] A second object of the present invention is to provide a method for preparing modified titanium dioxide.

[0005] A third object of the present invention is to provide a latex paint.

[0006] A fourth object of the present invention is to provide a method for preparing a latex paint.

[0007] The fifth object of the present invention is to provide the application of the modified titanium dioxide and / or latex paint in the field of decoration

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] The first aspect of the present invention provides a modified titanium dioxide, which is titanium dioxide graft-modified by a silane coupling agent and N-aminoethylpiperazine.

[0010] Preferably, the modified titanium dioxide comprises the following raw materials in parts by weight: 35-45 parts of titanium dioxide, 5-10 parts of alcohol solution, 5-10 parts of silane coupling agent, 5-10 parts of N-aminoethylpiperazine, 0.5-2 parts of catalyst, and 25-35 parts of water.

[0011] Preferably, the titanium dioxide is rutile titanium dioxide.

[0012] Preferably, the alcohol liquid is a polyol.

[0013] Preferably, the polyol is selected from at least one of ethylene glycol, propylene glycol, glycerol and butylene glycol.

[0014] Preferably, the catalyst is polyethylene oxide alkyl phenyl ether.

[0015] Preferably, the silane coupling agent is γ-glycidyloxypropyltrimethoxysilane.

[0016] The second aspect of the present invention provides a method for preparing the modified titanium dioxide provided in the first aspect of the present invention, comprising the following steps:

[0017] (1) titanium dioxide, alcohol solution, silane coupling agent, part of water, and catalyst are mixed and reacted to prepare titanium dioxide grafted with silane coupling agent;

[0018] (2) The titanium dioxide grafted with the silane coupling agent, N-aminoethylpiperazine, and the remaining water are mixed and reacted to obtain the modified titanium dioxide.

[0019] Preferably, the mixing reaction temperature in step (1) is 50-70°C.

[0020] Preferably, the mixing reaction time in step (1) is 3 to 10 hours.

[0021] Preferably, the mixing reaction temperature in step (2) is 70-100°C.

[0022] Preferably, the mixing reaction time in step (2) is 2 to 5 hours.

[0023] The present invention adopts a semi-continuous synthesis method. First, titanium dioxide with abundant hydroxyl groups on its surface is grafted with a silane coupling agent (for example, γ-glycidyloxypropyltrimethoxysilane, i.e., KH-560 silane coupling agent). Then, N-aminoethylpiperazine (i.e., AEP, which has amino groups and can effectively improve weather resistance) is grafted on this basis. The amount of catalyst and initiator added, the reaction temperature and time are controlled, and an appropriate raw material ratio is optimized to produce a modified titanium dioxide pigment (i.e., modified titanium dioxide) with a high grafting rate and stable and good weather resistance.

[0024] The third aspect of the present invention provides a latex paint comprising the modified titanium dioxide provided by the first aspect of the present invention, diatomaceous earth and nano titanium dioxide.

[0025] Preferably, the diatomaceous earth is Celite 499. Diatomaceous earth is a microporous material with a high specific surface area and excellent physical adsorption capacity. The micropores in the diatomaceous earth can physically adsorb formaldehyde.

[0026] Preferably, the latex paint comprises the following components in parts by weight: 3-6 parts of diatomaceous earth, 22-26 parts of modified titanium dioxide, 0.8-1.2 parts of nano titanium dioxide, 30-40 parts of emulsion, 11-17 parts of filler, 5.6-12 parts of additive, and 14-18 parts of solvent.

[0027] Preferably, the emulsion is selected from at least one of styrene acrylic emulsion, acetic acid acrylic emulsion, tert-acrylic emulsion, and acetic acid tert-acrylic emulsion; more preferably, the emulsion is styrene acrylic emulsion.

[0028] Preferably, the nano-titanium dioxide is rutile nano-titanium dioxide. Nano-titanium dioxide is a low-odor, low-VOC, high-catalytic-efficiency nano-titanium dioxide photocatalyst. It is easily dispersed in water and has good stability. Under visible light, it can catalytically decompose formaldehyde adsorbed on its surface, effectively and permanently reducing indoor formaldehyde levels.

[0029] Preferably, the styrene acrylic emulsion is produced through a core / shell copolymerization process, utilizing a self-generated seed method to produce a highly elastic styrene acrylic emulsion with an internally hydrophilic core and an externally hydrophobic shell, resulting in a hard-inside, soft-outside structure. The emulsion exhibits excellent water and scrub resistance. Furthermore, the styrene acrylic emulsion is preferably Rohm and Haas SF 508M.

[0030] Preferably, the filler comprises at least one of hydrophobically modified hydroxyethyl cellulose, calcium carbonate, and calcined kaolin.

[0031] Preferably, the filler comprises 0.3 to 0.5 parts of hydrophobically modified hydroxyethyl cellulose. The hydrophobically modified hydroxyethyl cellulose used in the present invention can improve the anti-spattering and flow properties of the latex paint.

[0032] Preferably, the hydrophobically modified hydroxyethyl cellulose is Ashland HE10K.

[0033] Preferably, the filler comprises 6 to 8 parts of calcium carbonate.

[0034] Preferably, the mesh size of the calcium carbonate is 800 to 1000 meshes.

[0035] Preferably, the calcium carbonate is calcite powder, which has high whiteness and good fluidity.

[0036] Preferably, the filler comprises 5 to 8 parts of calcined kaolin. The present invention utilizes calcined kaolin, leveraging its properties to impart excellent plasticity, adhesion, and weather resistance to the latex paint. Furthermore, the present invention utilizes calcined kaolin to physically adsorb formaldehyde, further reducing indoor formaldehyde levels.

[0037] Preferably, the filler comprises the following components in parts by weight: 0.3 to 0.5 parts of hydrophobically modified hydroxyethyl cellulose, 6 to 8 parts of calcium carbonate, and 5 to 8 parts of calcined kaolin.

[0038] Preferably, the auxiliary agent includes at least one of a dispersant, a defoaming agent, a pH regulator, a film-forming agent, an antifreeze-thaw agent, a leveling agent, a mildew preventer, a preservative, a covering polymer, and a wetting agent.

[0039] Preferably, the auxiliary agent includes 1.5 to 2.5 parts of a dispersant.

[0040] Preferably, the dispersant is a sodium polycarboxylate dispersant; sodium polycarboxylate dispersants have low foaming properties, can improve the fluidity of latex paint, and have excellent properties for stabilizing the viscosity of latex paint slurry. Further preferably, the dispersant is San Nopco SN-5040.

[0041] Preferably, the auxiliary agent includes 0.5 to 1.5 parts of a defoaming agent.

[0042] Preferably, the defoamer is a mineral oil defoamer. The foaming agent of the present invention can improve the storage stability of the latex paint, quickly break bubbles, and has strong defoaming ability. Further preferably, the defoamer is BASF Foamstar ST 2410AG.

[0043] Preferably, the auxiliary agent includes 0.2 to 0.4 parts of a pH regulator.

[0044] Preferably, the pH adjuster is a potassium hydrocarbylsilicon carboxylate pH adjuster. More preferably, the pH adjuster is Wacker BS168. The pH adjuster in the present invention is odorless, low in VOC, has good storage stability, and excellent pH stability.

[0045] Preferably, the auxiliary agent includes 0.3 to 0.5 parts of a film-forming auxiliary agent.

[0046] Preferably, the film-forming aid is an alcohol ether film-forming aid, an alcohol ester film-forming aid or a combination thereof, further preferably a low-odor, VOC-free type of alcohol ether film-forming aid or alcohol ester film-forming aid; further preferably a low-odor, VOC-free type of alcohol ester film-forming aid; more preferably Dow Coasol 290PLUS, which is low-odor and has no VOC emissions.

[0047] Preferably, the auxiliary agent comprises 0.3-0.5 parts of an anti-freezing auxiliary agent. The anti-freezing auxiliary agent in the present application can improve the freeze-thaw stability of the latex paint and improve the stain resistance of the latex paint. Preferably, the anti-freezing auxiliary agent does not contain APE and organic solvents, i.e. the anti-freezing auxiliary agent is a water-based anti-freezing auxiliary agent for water-based coatings.

[0048] Preferably, the anti-freezing auxiliary agent is a phosphate ester anti-freezing auxiliary agent; further preferably, the anti-freezing auxiliary agent is Rhodia FT-100.

[0049] Preferably, the auxiliary agent comprises 0.3-0.5 parts of a leveling auxiliary agent.

[0050] Preferably, the leveling auxiliary agent is a water-soluble non-ionic associated rheological modifier; the use of the leveling auxiliary agent in the present application can improve the flow and leveling of the latex paint, so that the latex paint has excellent flow and leveling, uniform film-forming performance, gloss exhibition and high thickening efficiency. The leveling auxiliary agent in the present application has low odor and does not contain solvent.

[0051] Preferably, the leveling auxiliary agent is selected from Rhom & Haas RM-8W, Acrysol RM 12W or a combination thereof.

[0052] Preferably, the auxiliary agent comprises 0.4-0.6 parts of a mildew-proof agent.

[0053] Preferably, the mildew-proof agent is a mildew-proof agent with diuron as the effective ingredient; further preferably, the mildew-proof agent is Solvay ACTICIDE IPW 50. The mildew-proof agent in the present application is formaldehyde-free and zero VOC, meeting the environmental protection requirements.

[0054] Preferably, the auxiliary agent comprises 0.1-0.3 parts of a preservative.

[0055] Preferably, the mildew-proof agent is a preservative with 1,2-benzisothiazolin-3-one as the effective ingredient; further preferably, the mildew-proof agent is Dow 551S preservative. The mildew-proof agent has a wide applicable pH range, is fully compatible with the water-based latex paint system in the present application, can simultaneously and efficiently avoid the pollution of multiple types of microorganisms such as yeast and mold, does not release any formaldehyde, and does not contain organic halogen and heavy metal.

[0056] Preferably, the auxiliary agent comprises 2-5 parts of a hiding polymer.

[0057] Preferably, the hiding polymer is selected from hollow polymer microspheres. The hiding polymer in the present application can significantly improve the hiding power and washability of the paint film. Further preferably, the hiding polymer is Laponite TM Optima E.

[0058] Preferably, the auxiliary agent includes the following components in parts by weight: 1.5 to 2.5 parts of dispersant, 0.5 to 1.5 parts of defoaming agent, 0.2 to 0.4 parts of pH regulator, 0.3 to 0.5 parts of film-forming agent, 0.3 to 0.5 parts of antifreeze-thaw agent, 0.3 to 0.5 parts of leveling agent, 0.4 to 0.6 parts of mildewproofing agent, 0.1 to 0.3 parts of preservative, and 2 to 5 parts of covering polymer.

[0059] Preferably, the wetting agent is an alcohol-based nonionic surfactant. The wetting agent used in the present invention is a low-foaming, low-odor, APEO-free, low-VOC alcohol-based nonionic surfactant, which has excellent penetration and surface tension reduction capabilities. Furthermore, the wetting agent is San Nopco SN-WET 996.

[0060] The latex paint formula of the present invention uses a compound of diatomaceous earth and nano-titanium dioxide. The diatomaceous earth has a large number of microporous structures and a high specific surface area, enabling it to more efficiently adsorb formaldehyde from the air. The nano-titanium dioxide added to the formula can then catalytically oxidize and decompose the adsorbed formaldehyde under visible light irradiation conditions. The present invention uses both physical adsorption and chemical catalytic decomposition mechanisms. The compound addition of diatomaceous earth and nano-titanium dioxide can achieve short-term, efficient, and long-term formaldehyde-resistant effects. In addition, the latex paint of the present invention uses anti-freeze-thaw additives to synergize with film-forming additives, preservatives, mildew inhibitors, emulsions and other ingredients, making the resulting latex paint green, environmentally friendly, and low in odor.

[0061] The fourth aspect of the present invention provides a method for preparing the latex paint provided by the third aspect of the present invention, comprising the following steps: mixing the various components of the latex paint to obtain a latex paint.

[0062] Preferably, the preparation method comprises the following steps:

[0063] S1: mixing part of the solvent, part of the additive, the filler, diatomaceous earth, nano titanium dioxide, and titanium dioxide to obtain a mixed slurry, wherein the fineness of the mixed slurry does not exceed 50 μm;

[0064] S2: The mixed slurry, the remaining solvent, the remaining additives and the emulsion are mixed to obtain the latex paint.

[0065] The fifth aspect of the present invention provides the use of the modified titanium dioxide provided by the first aspect of the present invention and / or the latex paint provided by the third aspect of the present invention in the field of decoration.

[0066] The beneficial effects of the present invention are as follows: the modified titanium dioxide in the present invention has excellent oxidation and aging resistance and weather resistance by grafting a silane coupling agent and N-aminoethylpiperazine on titanium dioxide.

[0067] The latex paint of the present invention adopts modified titanium dioxide to have excellent weather resistance, oxidation and aging resistance and excellent storage stability. Moreover, by grafting silane coupling agent and N-aminoethylpiperazine onto titanium dioxide, other properties of the latex paint will not be adversely affected. The present invention uses diatomaceous earth and nano titanium dioxide in a composite, and the two act synergistically to achieve short-term and efficient formaldehyde removal, and a long-term and continuous formaldehyde removal effect. In addition, the synergistic effect between the various raw materials in the present invention can make the latex paint have excellent workability, weather resistance and aging resistance, storage stability, low temperature resistance, acid and alkali resistance, water resistance and scrubbing resistance, and the latex paint of the present invention does not have the emission of toxic and noxious gases such as VOC, formaldehyde and benzene when in use, and does not have heavy metals, can achieve low odor or even odorlessness, and is environmentally friendly and harmless to the body. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 This is a flow chart of the preparation process of modified titanium dioxide.

[0069] Figure 2 1 is a flow chart of the preparation process of the latex paint in Examples 1 to 5. DETAILED DESCRIPTION

[0070] The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto. It should be noted that if there are any processes that are not particularly described in detail below, they can be implemented or understood by those skilled in the art with reference to the prior art. The reagents or instruments used that do not indicate the manufacturer are all conventional products that can be purchased commercially.

[0071] The raw materials used in the examples and comparative examples of the present invention are as follows:

[0072] KH-560 is a silane coupling agent, and its chemical name is γ-glycidoxypropyltrimethoxysilane; OP-10 is a polyoxyethylene alkyl phenyl ether; AEP is N-aminoethyl piperazine; titanium dioxide color filler is rutile type ultrafine titanium dioxide, and its trade name is Longmen R-996. The dispersant is SN-5040 of Sinopec; the defoaming agent is Foamstar ST 2410AG of BASF; the calcined kaolin is DG-80 of Super; the active diatomite is Celite 499; the modified nano titanium dioxide is rutile type nano titanium dioxide, which is purchased from Ningbo Jimo Nano New Material Technology Co., Ltd.; the modified hydroxyethyl cellulose is Yaxia Langshan HE10K; the calcium carbonate is 1000-mesh ultrafine calcite powder of Guangfu Building Materials; the PH regulator is Wacker BS168; the film forming aid is Coasol 290PLUS of Dow; the freeze-thaw resistant aid is FT-100 of Rhodia; the leveling aid is RM-8W of Romens; the mildewproof agent is ACTICIDE IPW 50 of Solvay; the preservative is 551S preservative of Dow; the styrene-acrylic emulsion is SF 508M of Romens; and the hiding polymer is Cool TM Optimal creation E.

[0073] The formula of the modified titanium dioxide used in the embodiments of the present application (i.e. titanium dioxide 1, titanium dioxide 2, titanium dioxide 3, titanium dioxide 4, titanium dioxide 5, titanium dioxide 6) is shown in Table 1 below:

[0074] Table 1 Formula of modified titanium dioxide (unit: parts by weight)

[0075]

[0076] Reference Figure 1 The preparation process flow chart of the modified titanium dioxide is shown in the above preparation method of the modified titanium dioxide, and the preparation method of the modified titanium dioxide includes the following steps:

[0077] (1) KH560 grafting: a four-necked flask equipped with a condenser, a stirrer, a dropping device and a thermometer is placed in a constant temperature water bath, a certain amount of deionized water, titanium dioxide, ethylene glycol, KH560 and polyoxyethylene alkyl phenyl ether (OP-10) are added, heated to 60℃, dispersed and fully reacted under stirring for 4h, and then the precipitate is washed with deionized water and filtered.

[0078] (2) AEP grafting: a four-necked flask equipped with a condenser, a stirrer, a dropping device and a thermometer is placed in a constant temperature water bath, a certain amount of deionized water, the solid precipitate filtered out in step (1) and AEP are added, heated to 80℃, dispersed and fully reacted under stirring for 3h, and then the precipitate is washed with deionized water, filtered and dried to obtain the modified titanium dioxide.

[0079] The appearance of the modified titanium dioxide prepared according to the above formula and preparation process was observed, and the AEP grafting rate of the modified titanium dioxide was tested using an infrared spectrometer. The specific test results are shown in Table 2 below:

[0080] Table 2 Appearance and grafting rate test results of modified titanium dioxide

[0081] Modified titanium white powder Appearance AEP grafting rate (%) Titanium white powder 1 No abnormalities 3.78 Titanium white powder 2 No abnormalities 1.74 Titanium white powder 3 No abnormalities 0.93 Titanium white powder 4 No abnormalities 2.64 Titanium white powder 5 No abnormalities 1.91 Titanium white powder 6 No abnormalities 0.87

[0082] Examples 1 to 5

[0083] Examples 1 to 5 provide a latex paint, respectively, and their formulas are shown in Table 3 below:

[0084] Table 3 Formula of latex paint in Examples 1 to 5 (Unit: parts by weight)

[0085]

[0086]

[0087] Reference Figure 2 The preparation process flow chart of the latex paint in the embodiment 1 to 5 is shown in FIG. , and the latex paint in the embodiment 1 to 5 is prepared by the following preparation method, and the specific steps are as follows:

[0088] (1) Premixing stage: Add part of the water, start the disperser, adjust the speed to 700r / min, add the dispersant and part of the defoamer, stir for 1 minute, add calcined kaolin, activated diatomaceous earth, modified nano titanium dioxide and stir for 2 minutes, then add modified hydroxyethyl cellulose, adjust the speed to 1200r / min, and then add modified titanium dioxide 1 and calcium carbonate in sequence. During the process of adding the powder, adjust the height, speed and feeding speed of the disperser to ensure that the powder does not accumulate. After the powder is added, add the pH regulator and adjust the speed to 1500r / min. After high-speed dispersion for 15 minutes, take a sample to test the fineness. When the fineness is below 50μm, proceed to the next step.

[0089] (2) Thinning stage: The rotation speed is adjusted to 900 r / min, and the film-forming agent, antifreeze-thaw agent, preservative, leveling agent, styrene acrylic emulsion, remaining defoamer and remaining water are added in sequence and stirred for 5 minutes. The basic performance test of the finished product can be carried out. After passing the test, the latex paints in Examples 1 to 5 are respectively prepared.

[0090] Performance testing:

[0091] (1) Main technical indicator test

[0092] According to the test items and test methods described in Table 4 below, the latex paints in Examples 1 to 5 were tested to see whether they met the requirements of the main technical indicators. The specific test results are shown in Table 5.

[0093] Table 4 main technical index test item and test method

[0094] Detection item Standard Detection method State in container Stirring mixed without hard block; in uniform state GB / T 9756-2018 Workability Construction two-way without barrier GB / T 9756-2018 Paint film appearance Normal GB / T 9756-2018 Drying time (table dry / h) ≤2 GB / T 1728-2020 Contrast rate (%) ≥0.95 GB / T 9756-2018 Water resistance (96h) No abnormalities GB / T 9265-2009 Alkali resistance (48h) No abnormalities GB / T 1733-1993 Low temperature stability No deterioration GB / T 9266-2008 Low temperature film forming property 5℃ film forming no abnormalities GB / T 9756-2018 Washing resistance 6000 times GB / T 9756-2018

[0095] Table 5 main technical index test results of latex paint in examples 1-5

[0096]

[0097] From table 5, the latex paint in examples 1-5 of the present application has excellent stability, construction performance, water resistance, alkali resistance, low temperature resistance, washing resistance and other properties.

[0098] (2) environmental performance test

[0099] According to the test items and test methods described in the following table 6, the environmental performance indicators such as VOC, benzene, toluene, free formaldehyde and other volatile gases, heavy metals in the latex paint in examples 1-5 are detected respectively, and the specific test results are shown in table 6.

[0100] Table 6 environmental performance test item and test method

[0101]

[0102]

[0103] From table 6, the latex paint in examples 1-5 of the present application does not contain VOC, benzene, toluene, ethylbenzene, xylene, formaldehyde, heavy metals and other components harmful to the environment.

[0104] (3) weather resistance and aging resistance test

[0105] According to the test items and test methods described in the following table 7, the artificial climate aging resistance and coating temperature change resistance of the latex paint in examples 1-5 are tested respectively, and the specific test results are shown in table 8.

[0106] Table 7 weather resistance and aging resistance test requirements

[0107] Detection item Standard Detection method Resistance to artificial climate aging - white and light color 600h no blistering, no peeling, no cracking GB / T 9755-2014 Coating temperature change resistance (3 cycles) No abnormalities GB / T 9755-2014

[0108] Table 8 weather resistance and aging resistance test results of latex paint in examples 1-5

[0109]

[0110] From table 8, the latex paint in examples 1-5 has excellent weather resistance and aging resistance, specifically: in the artificial climate aging resistance test, it can be free of blistering, peeling and cracking for more than 600h, and the paint film is normal after 3 times of coating temperature change resistance test.

[0111] (4) Anti-formaldehyde performance test

[0112] The finished latex paints prepared in Examples 1 to 5 were taken as test samples and the formaldehyde resistance test was carried out respectively. The specific test method was as follows: the inner wall of the sealed test glass box was coated with the same amount of latex paint by roller, and then the same initial 0.8 mg / m 3 The formaldehyde concentration environment was tested for short-term (7 days) and long-term (30 days) formaldehyde concentrations. The specific test results are shown in Table 9:

[0113] Table 9 Formaldehyde resistance test results of latex paint in Examples 1 to 5

[0114]

[0115] As shown in Table 9, the latex paints in Examples 1 to 5 of the present invention have short-term and long-term continuous formaldehyde removal effects, and the short-term formaldehyde absorption effect is related to the amount of activated diatomaceous earth used, while the long-term formaldehyde absorption effect is related to the modified nano-titanium dioxide.

[0116] The latex paint of the present invention can achieve the same technical effect as that of the latex paint using modified titanium dioxide 1 by using modified titanium dioxide 2 to 5.

[0117] In summary, the latex paint of the present invention has excellent stability, construction performance, water resistance, alkali resistance, low temperature resistance, scrub resistance and other properties. In terms of environmental protection performance, various harmful substances are "undetectable", which is far below the limit value in the GB 18582-2008 standard. In terms of weather resistance and aging resistance, it can achieve the technical indicators of excellent products in the resistance to artificial climate aging of exterior wall latex paint, and has short-term and long-term continuous formaldehyde removal effects, which can achieve "clean odor" in the construction site, reduce environmental pollution, and be more environmentally friendly.

[0118] While the embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. A modified titanium dioxide, characterized in that: The modified titanium dioxide is titanium dioxide grafted and modified by a silane coupling agent and N-aminoethylpiperazine; the silane coupling agent is gamma-glycidyloxypropyltrimethoxysilane.

2. The modified titanium dioxide according to claim 1, characterized in that: The modified titanium dioxide comprises the following raw materials in parts by weight: 35-45 parts of titanium dioxide, 5-10 parts of alcohol solution, 5-10 parts of silane coupling agent, 5-10 parts of N-aminoethylpiperazine, 0.5-2 parts of catalyst, and 25-35 parts of water.

3. The method for preparing the modified titanium dioxide according to claim 1, wherein: The following steps are involved: (1) titanium dioxide, alcohol solution, silane coupling agent, part of water, and catalyst are mixed and reacted to prepare titanium dioxide grafted with silane coupling agent; (2) The titanium dioxide grafted with the silane coupling agent, N-aminoethylpiperazine, and the remaining water are mixed and reacted to obtain the modified titanium dioxide.

4. A latex paint, characterized in that: The invention comprises the modified titanium dioxide according to claim 1 or 2, diatomaceous earth and nano titanium dioxide.

5. The latex paint according to claim 4, characterized in that: The latex paint comprises the following components in parts by weight: 3-6 parts of diatomaceous earth, 22-26 parts of modified titanium dioxide, 0.8-1.2 parts of nano titanium dioxide, 30-40 parts of emulsion, 11-17 parts of filler, 5.6-12 parts of additive, and 14-18 parts of solvent.

6. The latex paint according to claim 5, characterized in that: The filler comprises at least one of hydrophobically modified hydroxyethyl cellulose, calcium carbonate, and calcined kaolin.

7. The latex paint according to claim 5, characterized in that: The filler comprises the following components in parts by weight: 0.3 to 0.5 parts of hydrophobically modified hydroxyethyl cellulose, 6 to 8 parts of calcium carbonate, and 5 to 8 parts of calcined kaolin.

8. The latex paint according to claim 5, characterized in that: The auxiliary agent includes at least one of a dispersant, a defoaming agent, a pH regulator, a film-forming agent, an antifreeze-thaw agent, a leveling agent, a mildew preventer, a preservative, and a covering polymer.

9. The latex paint according to claim 5, characterized in that: The auxiliary agent includes the following components in parts by weight: 1.5 to 2.5 parts of a dispersant, 0.5 to 1.5 parts of a defoaming agent, 0.2 to 0.4 parts of a pH regulator, 0.3 to 0.5 parts of a film-forming auxiliary agent, 0.3 to 0.5 parts of an antifreeze-thaw auxiliary agent, 0.3 to 0.5 parts of a leveling auxiliary agent, 0.4 to 0.6 parts of a mildewproof agent, 0.1 to 0.3 parts of a preservative, and 2 to 5 parts of a covering polymer.

10. The method for preparing a latex paint according to any one of claims 4 to 9, characterized in that: The following steps are involved: The latex paint is prepared by mixing various components.

11. The method for preparing latex paint according to claim 10, wherein: The preparation method comprises the following steps: S1: mixing part of the solvent, part of the additive, the filler, diatomaceous earth, nano titanium dioxide, and titanium dioxide to obtain a mixed slurry, wherein the fineness of the mixed slurry does not exceed 50 μm; S2: The mixed slurry, the remaining solvent, the remaining additives and the emulsion are mixed to obtain the latex paint.

12. Use of the modified titanium dioxide according to claim 1 or 2 and / or the latex paint according to any one of claims 4 to 9 in the field of decoration.

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