A titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler and its preparation method and application

Abstract

The present invention belongs to the technical field of coating fillers and specifically relates to a titanium dioxide-modified potassium feldspar thermal insulation composite pigment and filler. The pigment and filler comprises the following raw materials by weight: 40-55 parts of titanium dioxide, 30-45 parts of potassium feldspar, 10-15 parts of lanthanum cerate, 1.5-2.6 parts of a coupling agent, 8-12 parts of sodium silicate, and 0.5-1 parts of sodium polycarboxylate. The present invention also provides the titanium dioxide-modified potassium feldspar thermal insulation composite pigment and filler and its use in exterior wall coatings. The thermal insulation composite pigment and filler of the present invention can solve the problems of poor weather resistance and easy fading of exterior wall coatings, while enhancing the hardness and thermal insulation function of the coating. The prepared composite material can also reduce the amount of titanium dioxide used, reducing the cost of the coating.

Description

Technical Field

[0001] The present invention belongs to the technical field of coating fillers, and in particular relates to a titanium dioxide modified potassium feldspar thermal insulation composite pigment filler, a preparation method thereof, and an application thereof. Background Art

[0002] Titanium dioxide is a white filler with excellent hiding power and tinting strength, and is widely used in architectural coatings. Economic development, social progress, and rising living standards have driven the growth of the construction and related coatings industries, leading to a growing demand for titanium dioxide. However, the complex processing of titanium dioxide and increasingly stringent environmental protection requirements have increased production costs and significantly increased its price. Potassium feldspar, a low-cost aluminum silicate mineral, is primarily used in the glass and ceramics industries. Guangxi has abundant potassium feldspar resources, but its application is limited.

[0003] Potassium feldspar is a potassium aluminosilicate mineral with a framework crystal structure composed of silicon-oxygen tetrahedra. Its chemical formula is K₂O·Al₂O₃·6SiO₂; its main components include SiO₂, Al₂O₃, K₂O, and CaO. Due to its low thermal conductivity, stable chemical properties, and high hardness, potassium feldspar is often added to materials to improve their heat resistance, acid and alkali resistance, and strength. Patent publication number CN115093754A, "A Multifunctional Composite Reflective Cooling Coating and Its Preparation Method," describes the addition of 3-5 parts of potassium feldspar to create a multifunctional composite reflective cooling coating. This coating exhibits excellent radiant cooling performance and possesses multiple functions, including waterproofing, mildew resistance, acid and alkali resistance, and air purification. Furthermore, improvements have been made in coating thickness, self-cleaning properties, weather resistance, and service life, addressing the problems of existing reflective thermal insulation coatings, such as limited functionality, poor radiant cooling performance, thick coatings, inconsistent coating lifespan, and poor self-cleaning and weather resistance. However, the invention also adds 6-12 parts of composite titanium dioxide and 6-8 parts of zinc oxide powder, which are relatively expensive fillers and increase the cost of the coating.

[0004] Therefore, it is very necessary to research and develop a potassium feldspar modification method that is environmentally friendly, simple to prepare, and low in cost. Summary of the Invention

[0005] The present invention aims to solve the above technical problems and provide a titanium dioxide modified potassium feldspar thermal insulation composite pigment filler to solve the problems of poor weather resistance and easy fading of exterior wall coatings. At the same time, it can enhance the hardness and thermal insulation function of the coating. The prepared composite material can also reduce the amount of titanium dioxide used and reduce the cost of coatings.

[0006] The technical solution of the present invention is:

[0007] A titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler comprises the following raw materials by weight: 40-55 parts of titanium dioxide, 30-45 parts of potassium feldspar, 10-15 parts of lanthanum cerate, 1.5-2.6 parts of coupling agent, 8-12 parts of sodium silicate, and 0.5-1 part of sodium polycarboxylate.

[0008] Preferably, the particle size of the titanium dioxide of the present invention is 1200-1500 mesh, the particle size of the potassium feldspar is 500-800 mesh, and the particle size of the lanthanum cerate is 1800-2000 mesh.

[0009] The present invention uses abundant potassium feldspar powder as a core matrix, titanium dioxide and lanthanum ceria as coating materials, and uses a liquid phase method to synthesize a thermal insulation composite pigment filler. When the raw materials are simply stirred with water in a reactor, the powder is difficult to disperse evenly. The addition of sodium polycarboxylate can respectively transmit electrostatic repulsion and steric repulsion, thereby enhancing the dispersion ability of the powder. The present invention uses KH550 as a powder surface modifier to make the powder particles urchin-shaped, which is conducive to the hydrophobic polymerization of the powder. In addition, the present invention uses lanthanum ceria as a thermal insulation material, which has strong reflection of high-heat near-infrared rays and synergistic coating with titanium dioxide, which is conducive to improving the thermal insulation performance of the composite material. The present invention uses sodium silicate as a silicon source, and after adjusting the pH with sodium hydroxide solution, it is added to form a silicon dioxide coating on the surface of the composite material, which is conducive to improving the stability of the composite material.

[0010] The present invention uses sodium silicate as a silicon source, has abundant raw material sources, low price, simple production process, and the coated titanium dioxide modified potassium feldspar has stronger stability.

[0011] Preferably, the method for preparing the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler of the present invention comprises the following steps:

[0012] S1. Weigh the raw material components in parts by weight:

[0013] S2. The sodium polycarboxylate was divided into three parts at a mass ratio of 8:3:7, namely, parts A, B, and C; the mass ratio of the coupled chain was 8:3:7 and divided into three parts, namely, parts a, b, and c;

[0014] S3. Titanium dioxide was first dispersed in pure water, and then part A of sodium polycarboxylate was added, stirred and then part a of a coupling chain was added, the reaction was stirred to obtain a titanium dioxide slurry; lanthanum cerate was dispersed in pure water, and then part B of sodium polycarboxylate was added, stirred and then part b of a coupling chain was added, the reaction was stirred to obtain a lanthanum cerate slurry; potassium feldspar was dispersed in pure water, and then part C of sodium polycarboxylate was added, stirred and then part c of a coupling chain was added, the reaction was stirred to obtain a potassium feldspar slurry;

[0015] S4. The titanium dioxide slurry and lanthanum cerate slurry obtained in S3 were sequentially added to the potassium feldspar slurry and stirred for reaction;

[0016] S5. After adjusting the pH to 10-12 with a 10% mass fraction of NaOH solution, slowly add sodium silicate and stir the reaction;

[0017] S6. The obtained slurry is filtered, dried, and dispersed to obtain the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler.

[0018] In the method of the present invention, potassium feldspar is used as the core, titanium dioxide is used for surface modification, lanthanum ceria is filled, and the outermost layer is stably coated with silicon dioxide to form a core-shell structure, so the order of adding materials cannot be changed.

[0019] Preferably, in step S2 of the present invention, sodium polycarboxylate is divided into part A, part B and part C in a mass ratio of 8:3:7.

[0020] Preferably, in step S2 of the present invention, the double chain is divided into part a, part b and part c at a mass ratio of 8:3:7.

[0021] Too high or too low a slurry concentration will affect the coating efficiency of the product. In order to obtain excellent coating efficiency, preferably, in step S3 of the present invention, the weight ratio of titanium dioxide to pure water is 1:1; the weight ratio of lanthanum cerate to pure water is 1:1; and the weight ratio of potassium feldspar to pure water is 1:1.

[0022] Preferably, in steps S3 and S4 of the present invention, the stirring reaction time is 25-35 min; in S5, the stirring reaction time is 35-45 min.

[0023] In order to avoid introducing other ions and affecting the purity of the product, preferably, in step S5 of the present invention, a NaOH solution with a mass fraction of 10% is used to adjust the pH.

[0024] The present invention also provides the use of the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler in exterior wall coatings. Specifically, the addition amount of the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler is 6-10% of the total mass of the exterior wall coating.

[0025] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0026] 1. The potassium feldspar in the titanium dioxide modified potassium feldspar thermal insulation composite pigment filler of the present invention has a higher specific heat capacity after modification. When applied to exterior wall paint, the temperature will not rise too high, which can effectively reduce the decomposition of pigment molecules and emulsion matrix, improve the heat resistance and weather resistance of the paint, and make the exterior wall paint have better thermal insulation function and not easy to fade, which well solves the problem of poor weather resistance and easy fading of exterior wall paint in the prior art.

[0027] 2. The present invention uses titanium dioxide to modify potassium feldspar, and the prepared titanium dioxide modified potassium feldspar insulation composite pigment and filler can replace part of the titanium dioxide in exterior wall coatings, thereby reducing the amount of titanium dioxide used and lowering the cost of exterior wall coatings.

[0028] 3. The present invention uses titanium dioxide and lanthanum cerate to modify potassium feldspar, making the flat structure of potassium feldspar rough, increasing its specific surface area, which is beneficial to improving the compatibility of titanium dioxide modified potassium feldspar insulation composite pigment and filler with exterior wall resin emulsion. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is an electron microscope scanning image of the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler in Example 1 of the present invention. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] A titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler is composed of the following parts by weight: 45 parts of titanium dioxide (particle size of 1250 mesh), 35 parts of potassium feldspar (particle size of 800 mesh), 13 parts of lanthanum ceria (particle size of 2000 mesh), 1.98 parts of KH-550, 10 parts of sodium silicate, and 0.72 parts of sodium polycarboxylate.

[0033] The preparation method of the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler comprises the following steps:

[0034] S1. Weigh the raw material components according to the above weight parts:

[0035] S2. The mass number of sodium polycarboxylate was divided into three parts, namely 0.32 parts, 0.12 parts, and 0.28 parts; the mass number of KH-550 was divided into 3 parts, namely 0.88 parts, 0.33 parts, and 0.77 parts;

[0036] S3. Titanium dioxide was first dispersed in pure water in a mass ratio of 1:1, and then 0.32 parts of sodium polycarboxylate was added, stirred and then 0.88 parts of KH-550 was added, and the reaction was stirred for 30 minutes to obtain a titanium dioxide slurry; lanthanum cerate was dispersed in pure water in a mass ratio of 1:1, and then 0.12 parts of sodium polycarboxylate was added, stirred and then 0.33 parts of KH-550 was added, and the reaction was stirred for 30 minutes to obtain a lanthanum cerate slurry; potassium feldspar was dispersed in pure water in a mass ratio of 1:1, and then 0.28 parts of sodium polycarboxylate was added, stirred and then 0.77 parts of KH-550 was added, and the reaction was stirred for 30 minutes to obtain a potassium feldspar slurry;

[0037] S4. The titanium dioxide slurry and lanthanum cerate slurry obtained in S3 were sequentially added to the potassium feldspar slurry and stirred for 30 min;

[0038] S5. After adjusting the pH to 10 by adding 10% NaOH solution, sodium silicate was slowly added and the reaction was stirred for 40 min;

[0039] S6. The resulting slurry was filtered, dried, and dispersed to obtain a titanium dioxide-modified potassium feldspar thermal insulation composite filler, as shown in the electron microscope image. Figure 1 .

[0040] Example 2

[0041] A titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler is composed of the following parts by weight: 40 parts of titanium dioxide (particle size of 1500 mesh), 30 parts of potassium feldspar (particle size of 800 mesh), 10 parts of lanthanum ceria (particle size of 2000 mesh), 1.62 parts of KH-550, 8 parts of sodium silicate, and 0.54 parts of sodium polycarboxylate.

[0042] The preparation method of the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler comprises the following steps:

[0043] S1. Weigh the raw material components according to the above weight parts:

[0044] S2. The mass number of sodium polycarboxylate was divided into three parts, respectively, 0.24 parts, 0.09 parts, and 0.21 parts; the mass number of KH-550 was divided into 3 parts, respectively, 0.72 parts, 0.27 parts, and 0.63 parts;

[0045] S3. Titanium dioxide was first dispersed in pure water in a mass ratio of 1:1, and then 0.24 parts of sodium polycarboxylate were added, stirred and then 0.72 parts of KH-550 were added, and the reaction was stirred for 30 minutes to obtain a titanium dioxide slurry; lanthanum cerate was dispersed in pure water in a mass ratio of 1:1, and then 0.09 parts of sodium polycarboxylate were added, stirred and then 0.27 parts of KH-550 were added, and the reaction was stirred for 30 minutes to obtain a lanthanum cerate slurry; potassium feldspar was dispersed in pure water in a mass ratio of 1:1, and then 0.21 parts of sodium polycarboxylate were added, stirred and then 0.63 parts of KH-550 were added, and the reaction was stirred for 30 minutes to obtain a potassium feldspar slurry;

[0046] S4. The titanium dioxide slurry and lanthanum cerate slurry obtained in S3 were sequentially added to the potassium feldspar slurry and stirred for 30 min;

[0047] S5. After adjusting the pH to 10 by adding 10% NaOH solution, sodium silicate was slowly added and the reaction was stirred for 40 min;

[0048] S6. The obtained slurry is filtered, dried, and dispersed to obtain the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler.

[0049] Example 3

[0050] A titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler is composed of the following parts by weight: 55 parts of titanium dioxide (particle size of 1200 mesh), 45 parts of potassium feldspar (particle size of 500 mesh), 15 parts of lanthanum ceria (particle size of 1800 mesh), 2.52 parts of KH-550, 12 parts of sodium silicate, and 1.08 parts of sodium polycarboxylate.

[0051] The preparation method of the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler comprises the following steps:

[0052] S1. Weigh the raw material components according to the above weight parts:

[0053] S2. The mass number of sodium polycarboxylate was divided into three parts, namely 0.48 parts, 0.18 parts, and 0.42 parts; the mass number of KH-550 was divided into 3 parts, namely 1.12 parts, 0.42 parts, and 0.98 parts;

[0054] S3. Titanium dioxide was first dispersed in pure water in a mass ratio of 1:1, and then 0.48 parts of sodium polycarboxylate was added, stirred and then 1.12 parts of KH-550 was added, and the reaction was stirred for 30 minutes to obtain a titanium dioxide slurry; lanthanum cerate was dispersed in pure water in a mass ratio of 1:1, and then 0.18 parts of sodium polycarboxylate was added, stirred and then 0.42 parts of KH-550 was added, and the reaction was stirred for 30 minutes to obtain a lanthanum cerate slurry; potassium feldspar was dispersed in pure water in a mass ratio of 1:1, and then 0.42 parts of sodium polycarboxylate was added, stirred and then 0.98 parts of KH-550 was added, and the reaction was stirred for 30 minutes to obtain a potassium feldspar slurry;

[0055] S4. The titanium dioxide slurry and lanthanum cerate slurry obtained in S3 were sequentially added to the potassium feldspar slurry and stirred for 30 min;

[0056] S5. After adjusting the pH to 12 by adding 10% NaOH solution, sodium silicate was slowly added and the reaction was stirred for 40 min;

[0057] S6. The obtained slurry is filtered, dried, and dispersed to obtain the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler.

[0058] In order to verify the superiority of the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler formula of the present invention, the following comparative examples are set up, as follows:

[0059] Comparative Example 1: The difference from Example 1 is that titanium dioxide is replaced with potassium feldspar, and the rest is the same as Example 1.

[0060] Comparative Example 2: The difference from Example 1 is that potassium feldspar is replaced with titanium dioxide, and the rest is the same as Example 1.

[0061] Comparative Example 3: The difference from Example 1 is that lanthanum ceria is removed, and the sodium polycarboxylate and KH-550 that match lanthanum ceria are also removed. The rest is the same as Example 1.

[0062] Comparative Example 4: The difference from Example 1 is that KH-550 is removed, and the parts related to KH-550 in the method are removed. The rest are the same as Example 1.

[0063] Comparative Example 5: The difference from Example 1 is that sodium silicate is removed. The parts related to sodium silicate in the method are removed, and the rest are the same as Example 1.

[0064] The performance tests were performed on the above Example 1 and Comparative Examples 1-5. The results are shown in Table 1.

[0065] Table 1 Performance of different titanium dioxide modified potassium feldspar thermal insulation composite pigments and fillers

[0066]

[0067] As can be seen from Table 1, the performance of the titanium dioxide modified potassium feldspar thermal insulation composite pigment filler is comparable to that of pure titanium dioxide, and can replace titanium dioxide for use in exterior wall coatings; the composite material of Comparative Example 1 mainly contains potassium feldspar, with low whiteness and hiding power, a small specific surface area of ​​the material, and therefore a small oil absorption; the composite material in Comparative Example 2 mainly contains titanium dioxide, with high whiteness and hiding power, and due to its small particle size, a smaller specific surface area and a lower oil absorption; in Comparative Example 3, lanthanum cerate is removed from the composite material, and the whiteness and hiding power are slightly reduced, and the particle size of the composite material is smaller than that of Example 1, so the oil absorption is slightly reduced; in Comparative Example 4, the surfactant KH-550 is removed, and the material composite efficiency is low, the whiteness and hiding power are low, and the oil absorption is average; in Comparative Example 5, the outermost layer of silica wrapping is removed, the material surface is rougher, the oil absorption increases, but the whiteness and contrast ratio do not change much. In summary, the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler obtained by adopting the formula of the present invention has good comprehensive performance in whiteness, hiding power and oil absorption.

[0068] In order to verify the superiority of the method for preparing the thermal insulation composite pigment and filler of titanium dioxide modified potassium feldspar of the present invention, the following comparative examples are set up, as follows:

[0069] Comparative Example 6: The difference from Example 2 is that the preparation method of the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler is:

[0070] S3. Titanium dioxide and potassium feldspar were dispersed in pure water (the amount of water added was the sum of the corresponding amounts of water added to titanium dioxide and potassium feldspar in Example 2), and then sodium polycarboxylate was added (the amount added was the sum of the corresponding amounts added to titanium dioxide and potassium feldspar in Example 2), and after stirring, KH-550 was added (the amount added was the sum of the corresponding amounts added to titanium dioxide and potassium feldspar in Example 2), and the reaction was stirred for 30 minutes to obtain a titanium dioxide composite potassium feldspar slurry; lanthanum cerate was dispersed in pure water in a mass ratio of 1:1, and then 0.0.6 parts of sodium polycarboxylate were added, and after stirring, 0.19 parts of KH-550 were added, and the reaction was stirred for 30 minutes to obtain a lanthanum cerate slurry;

[0071] S4. The lanthanum cerate slurry obtained in S3 was added to the titanium dioxide composite potassium feldspar slurry and the reaction was stirred for 30 min;

[0072] The rest is the same as Example 2.

[0073] Comparative Example 7

[0074] The difference from Example 2 is that: after all the powders of titanium dioxide, potassium feldspar and lanthanum cerate are mixed, water is added (the amount of water added is the sum of the corresponding amounts of water added of titanium dioxide, potassium feldspar and lanthanum cerate in Example 2) to form a slurry, and then sodium polycarboxylate and KH-550 are added and stirred for 30 minutes; the rest is the same as Example 2.

[0075] Comparative Example 8

[0076] The difference from Example 2 is:

[0077] S1-S3 are the same as in Example 2;

[0078] S4. The pH of each slurry was adjusted to 10 with a 10% mass fraction of NaOH solution;

[0079] S5. Sodium silicate was divided into three parts at a mass ratio of 8:3:7, and the corresponding parts were mixed with the titanium dioxide slurry, lanthanum cerate slurry and potassium feldspar slurry after adjusting the pH value, and stirred for 40 minutes. Then, all the sodium silicate modified slurry was mixed and stirred for 30 minutes.

[0080] The rest is the same as Example 2. The performance of the titanium dioxide modified potassium feldspar thermal insulation composite pigments and fillers prepared in Example 2 and Comparative Examples 6-8 was tested, and the results are shown in Table 2.

[0081] Table 2 Performance test results of different titanium dioxide modified potassium feldspar thermal insulation composite pigments and fillers

[0082]

[0083] In Comparative Example 6, titanium dioxide and potassium feldspar were mixed before the modifier was added. Although the powder surface was modified, the composite efficiency was not high. Therefore, the whiteness and hiding power of the composite pigment filler prepared in Comparative Example 6 were low. Similarly, the whiteness and hiding power of Comparative Example 7 were also low. In Comparative Example 8, the powder was first coated with silica before composite. The silica covered the surface modifier, so the powder composite was unsuccessful. Therefore, its whiteness and hiding power were very low. However, the surface of the particles was coated with silica, the specific surface area was small, and the oil absorption was low. In summary, the titanium dioxide modified potassium feldspar thermal insulation composite pigment filler prepared by the specific method of the present invention has good comprehensive performance in whiteness, hiding power, and oil absorption.

[0084] Example 4: Application of titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler in exterior wall coatings.

[0085] An exterior wall paint containing titanium dioxide modified potassium feldspar composite thermal insulation pigment and filler, composed of the following parts by weight:

[0086] 32 parts of water, 3 parts of cellulose, 0.2 parts of multifunctional additive, 0.6 parts of dispersant, 2 parts of ethylene glycol, 0.2 parts of wetting agent, 1.4 parts of film-forming aid, 0.4 parts of defoaming agent, 0.2 parts of bactericide, 8 parts of titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler prepared in Example 1, 5 parts of kaolin, 5 parts of wollastonite, 2 parts of barium sulfate, 23 parts of heavy calcium carbonate, and 20 parts of aqueous resin emulsion.

[0087] The cellulose is hydroxyethyl cellulose, brand 250HBR; the multifunctional additive is 2-amino-2-methyl-1-propanol containing 5% by mass, brand Amp-95; the wetting agent is octylphenol polyoxyethylene ether, brand CX-407; the film-forming additive is alcohol ester dodecahydrate; the defoaming agent is a composite of organic polyether ester and mineral oil, brand DF-18; the fungicide is a mixture of formaldehyde releaser and kason, brand CHS5; and the emulsion is a styrene acrylic emulsion, brand 5939.

[0088] A method for preparing an exterior wall coating containing titanium dioxide modified potassium feldspar composite thermal insulation pigment and filler is as follows:

[0089] S1. Weigh the raw material components according to the above weight;

[0090] S2. First, cellulose and multifunctional additives were added to water and dispersed, the speed was adjusted to 800 rpm, and stirred for 10 min;

[0091] S4. Reduce the speed to 700 rpm, add dispersant, wetting agent and 1 / 2 defoamer, stir and disperse for 10 min;

[0092] S5. The titanium dioxide modified potassium feldspar insulating composite pigment prepared in Example 1, kaolin, wollastonite, barium sulfate and heavy calcium were sequentially added, the speed was adjusted to 1500 rpm / min, and dispersed for 40 min;

[0093] S6. Adjust the speed to 700 rpm, slowly add ethylene glycol and film-forming aid, and stir and disperse for 5 minutes;

[0094] S7. Add the aqueous resin emulsion and the remaining defoamer, stir and disperse for 15 minutes, and filter with a 200-mesh sieve to obtain an exterior wall coating containing the titanium dioxide-modified potassium feldspar insulating composite pigment and filler prepared in Example 1.

[0095] Comparative Example A

[0096] The only difference from Example A is that the titanium dioxide modified potassium feldspar insulating composite pigment and filler prepared in Example 1 is replaced by the titanium dioxide modified potassium feldspar insulating composite pigment and filler prepared in Comparative Example 1, and the rest is the same as Example 4.

[0097] Comparative Example B

[0098] The only difference from Example A is that the titanium dioxide modified potassium feldspar insulating composite pigment and filler prepared in Example 1 is replaced by the titanium dioxide modified potassium feldspar insulating composite pigment and filler prepared in Comparative Example 2, and the rest is the same as Example 4.

[0099] Comparative Example C

[0100] The only difference from Example A is that the titanium dioxide modified potassium feldspar insulating composite pigment and filler prepared in Example 1 is replaced with the titanium dioxide modified potassium feldspar insulating composite pigment and filler prepared in Comparative Example 3, and the rest is the same as Example 4.

[0101] Comparative Example D

[0102] The only difference from Example A is that the titanium dioxide modified potassium feldspar insulating composite pigment and filler prepared in Example 1 is replaced with the titanium dioxide modified potassium feldspar insulating composite pigment and filler prepared in Comparative Example 4, and the rest is the same as Example 4.

[0103] Comparative Example E

[0104] The only difference from Example A is that the titanium dioxide modified potassium feldspar insulating composite pigment and filler prepared in Example 1 is replaced by the titanium dioxide modified potassium feldspar insulating composite pigment and filler prepared in Comparative Example 5, and the rest is the same as Example 4.

[0105] The contrast ratio, thermal insulation temperature difference, color heat resistance, and scrub resistance of the exterior wall coatings containing titanium dioxide-modified potassium feldspar thermal insulation composite pigments and fillers prepared in Example 4 and Comparative Examples AE were tested. The results are shown in Table 3. The contrast ratio and scrub resistance were tested in accordance with the national standard GB / T 9755-2014, "Synthetic Resin Emulsion Exterior Wall Coatings." The thermal insulation temperature difference was tested in accordance with the industry standard JG / T 1040-2020, "Heat-Reflective Insulating Coatings for Building Exterior Surfaces." Color heat resistance was tested by adjusting the coating to charcoal black, heating it in a curing chamber at 50°C for 1000 hours, and then observing the color fading on a sample plate.

[0106] Table 3 Performance of different exterior wall coatings

[0107]

[0108] The following conclusions can be drawn from Table 3:

[0109] (1) The coating contrast ratio of the product in Example 4 is relatively high, close to the coating contrast ratio of the product in Example B with pure titanium dioxide added; while in Example A, potassium feldspar not modified by titanium dioxide is added, and the coating contrast ratio is the worst; in Example C, the titanium dioxide-modified potassium feldspar composite thermal insulation pigment and filler does not contain lanthanum cerate thermal insulation material, and the coating contrast ratio does not change much, which shows that lanthanum cerate has little effect on the coating contrast ratio; the thermal insulation composite pigment and filler added in Example D is not modified with KH-550, and the raw material composite efficiency is not high, so the coating contrast ratio is poor; the thermal insulation composite pigment and filler in Example E is not coated with silica, and the stability is poor. After adding the coating and stirring, the structure is destroyed, resulting in a decrease in the coating contrast ratio;

[0110] (2) Among the thermal insulation composite pigments and fillers prepared in several synthesis schemes, the composite thermal insulation pigment and filler added in Comparative Example C does not contain lanthanum cerate thermal insulation material, so the thermal insulation temperature difference of the coating is poor. The composite thermal insulation pigment and filler added in Comparative Example A does not contain titanium dioxide, and the coating temperature is poor. This shows that titanium dioxide also has a certain influence on the thermal insulation effect of the coating;

[0111] (3) The heat-insulating composite pigment and filler added in Comparative Example B does not contain potassium feldspar, and the coating has poor heat resistance, easily fades when heated, and has poor scrubbing resistance. It can be seen that adding potassium feldspar to the coating is beneficial to improving the color heat resistance and scrubbing resistance of the coating.

[0112] In summary, the titanium dioxide-modified potassium feldspar thermal insulation composite pigment and filler prepared by the synergistic effect of the formula and method of the present invention, when used in exterior wall coatings, solves the problems of poor weather resistance and easy fading of exterior wall coatings, while enhancing the hardness and thermal insulation function of the coating. The prepared composite material can also reduce the amount of titanium dioxide used and reduce the cost of coatings.

[0113] The above description is a detailed description of the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. Any equivalent changes or modifications completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler, characterized in that: The raw materials include the following components by weight: 40-55 parts of titanium dioxide, 30-45 parts of potassium feldspar, 10-15 parts of lanthanum cerate, 1.5-2.6 parts of coupling agent, 8-12 parts of sodium silicate, and 0.5-1 part of sodium polycarboxylate; The preparation method of the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler comprises the following steps: S1. Weigh the raw material components in parts by weight: S2. The sodium polycarboxylate is divided into three parts, namely, part A, part B, and part C; the coupling agent is divided into 3 parts, namely, part a, part b, and part c; S3. Titanium dioxide was first dispersed in pure water, and then part A of sodium polycarboxylate was added, stirred and then part a of a coupling agent was added, and the reaction was stirred to obtain a titanium dioxide slurry; lanthanum cerate was dispersed in pure water, and then part B of sodium polycarboxylate was added, stirred and then part b of a coupling agent was added, and the reaction was stirred to obtain a lanthanum cerate slurry; potassium feldspar was dispersed in pure water, and then part C of sodium polycarboxylate was added, stirred and then part c of a coupling agent was added, and the reaction was stirred to obtain a potassium feldspar slurry; S4. The titanium dioxide slurry and lanthanum cerate slurry obtained in S3 were sequentially added to the potassium feldspar slurry and stirred for reaction; S5. After adjusting the pH to 10-12, slowly add sodium silicate and stir the reaction; S6. The obtained slurry is filtered, dried, and dispersed to obtain the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler.

2. The titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler according to claim 1, characterized in that: The particle size of the titanium dioxide is 1200-1500 mesh, the particle size of the potassium feldspar is 500-800 mesh, and the particle size of the lanthanum cerate is 1800-2000 mesh.

3. The titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler according to claim 1, characterized in that: In step S2, sodium polycarboxylate is divided into part A, part B, and part C according to a mass ratio of 8:3:

7.

4. The titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler according to claim 1, characterized in that: In step S2, the coupling agent is divided into part a, part b, and part c according to a mass ratio of 8:3:

7.

5. The titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler according to claim 1, characterized in that: In step S3, the weight ratio of titanium dioxide to pure water is 1:1; the weight ratio of lanthanum cerate to pure water is 1:1; and the weight ratio of potassium feldspar to pure water is 1:

1.

6. The titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler according to claim 1, characterized in that: In steps S3 and S4, the stirring reaction time is 25-35 minutes; in step S5, the stirring reaction time is 35-45 minutes.

7. The titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler according to claim 1, characterized in that: In step S5, the pH is adjusted using a NaOH solution with a mass fraction of 10%.

8. Use of the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler as claimed in claim 1 or 2 in exterior wall coatings.

9. The use of the titanium dioxide modified potassium feldspar thermal insulation composite pigment and filler in exterior wall coatings as claimed in claim 8, characterized in that: The addition amount of the titanium dioxide modified potassium feldspar heat-insulating composite pigment and filler is 6-10% of the total mass of the exterior wall coating.

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