Diffuse reflection paint and preparation method thereof

Abstract

The invention discloses a diffuse reflection paint coating and a preparation method thereof, and relates to the technical field of paint coatings. The paint comprises the following components in parts by weight: 350-450 parts of water-based resin; 150-250 parts of modified filler; 40-60 parts of titanium dioxide; 1-3 parts of AMP-95; 3-5 parts of leveling agent; 3-5 parts of cross-linking agent; 1-2 parts of thickener; 1-2 parts of accelerator; and 170-230 parts of deionized water. The diffuse reflective coating obtained by the present invention is excellent in comprehensive performance by preparing a special modified filler and selecting a specific content of an OPP matte film water-based matte anti-scratch resin, AMP-95, an organosilicon leveling agent LE-402, an isocyanate crosslinker, an associative water-based resin thickener TK311A, and an aqueous adhesion salt spray resistance accelerator CX80, wherein the visible light diffuse reflectance can reach 98%. Under international / national standard tests, the adhesion, impact resistance, weather resistance, high temperature resistance, acid resistance, alkali resistance, and water resistance of the coating are all qualified or normal.

Description

Technical Field

[0001] The invention relates to the technical field of paint coatings, and in particular to a diffuse reflection paint coating and a preparation method thereof. Background Art

[0002] The coating is composed of base material, diffuse reflective material, high thermal conductivity material, filler, etc. It is sprayed or dispensed on aluminum, ceramic, copper substrates or various reflectors to evenly form a layer of highly diffuse reflective white coating, improve luminous efficiency, eliminate glare or light spots, and ensure good light color consistency.

[0003] Diffuse reflective coatings are divided into single-component or two-component types, and are cured at room temperature or high temperature to form a coating film.

[0004] At present, some diffuse reflective coatings on the market use polyvinyl alcohol as a binder. Although it is environmentally friendly, it is not water-resistant, can only be used indoors and has poor durability; some use acrylic emulsions as binders, which have acceptable water resistance and weather resistance but are not resistant to high temperatures and can only be used in occasions with lower requirements; some use solvent-based silicon-containing baking paint systems as binders, which have acceptable water resistance, weather resistance and temperature resistance, but are not environmentally friendly, and generally have the problem of unsatisfactory reflectivity (generally less than 95%) at standard coating thickness. Summary of the invention

[0005] In view of the problems existing in the prior art, an object of the present invention is to provide a diffuse reflection paint coating, which comprises the following components in parts by weight:

[0006] 350-450 parts of water-based resin;

[0007] 150-250 parts of modified filler;

[0008] 40-60 parts of titanium dioxide;

[0009] AMP-95 1-3 parts;

[0010] 3-5 parts of leveling agent;

[0011] 3-5 parts of cross-linking agent;

[0012] 1-2 parts of thickener;

[0013] 1-2 parts of accelerator;

[0014] 170-230 parts of deionized water.

[0015] Furthermore, the coating comprises the following ingredients in parts by weight:

[0016] 350 parts of water-based resin;

[0017] 150 parts of modified filler;

[0018] 40 parts of titanium dioxide;

[0019] AMP-95 1 part;

[0020] 3 parts of leveling agent;

[0021] 3 parts of cross-linking agent;

[0022] 1 part thickener;

[0023] 1 part of accelerator;

[0024] 170 parts of deionized water.

[0025] Preferably, the water-based resin is a water-based matte anti-scratch resin for OPP matte film.

[0026] Preferably, the preparation method of the modified filler is as follows: take 30 parts of bentonite, 20 parts of barium sulfate, 50 parts of heavy calcium powder, 5 parts of sodium polyacrylate, 300 parts of 0.5% sulfuric acid solution, 20 parts of aluminum hydroxide powder, 30 parts of fluff powder, 10 parts of sorbitan monooleate, 3 parts of methyltriethoxysilane, 2 parts of stearic acid, and 1 part of sodium silicate by weight; first pour the sulfuric acid solution into a container, add bentonite, barium sulfate, heavy calcium powder and sodium polyacrylate, stir and mix them thoroughly at 75°C, then filter and remove the filtrate, and wash the filter cake with water; then add deionized water twice the weight of the filter cake, as well as aluminum hydroxide powder, fluff powder, sorbitan monooleate, and methyltriethoxysilane, and stir and disperse for 30 minutes at a speed of 1500r / min; finally, add stearic acid and sodium silicate and stir thoroughly, heat to a temperature of 65°C, ball mill, and dry to obtain a fineness of 15μm.

[0027] Preferably, the leveling agent is organic silicon leveling agent LE-402.

[0028] Preferably, the cross-linking agent is an isocyanate cross-linking agent.

[0029] Preferably, the thickener is an associative water-based resin thickener TK311A.

[0030] Preferably, the accelerator is a water-based adhesion salt spray resistance accelerator CX80.

[0031] Another object of the present invention is to provide a method for preparing a diffuse reflective paint coating, which specifically comprises the following steps: firstly, placing an aqueous matte anti-scratch resin for OPP matte film, an isocyanate crosslinking agent and 2 / 3 of deionized water by weight in a reaction container, and stirring and dispersing the mixture by ultrasonic at a heating rate of 2°C / min and a rotation speed of 800r / min for 25 minutes, and then cooling the mixture to 42°C and keeping the mixture warm; then, adding titanium dioxide, a modified filler and 1 / 3 of deionized water by weight into the reaction container, and stirring and dispersing the mixture for 12 minutes at a heating rate of 2°C / min and a rotation speed of 1000r / min, and then cooling the mixture to 42°C and keeping the mixture warm; The mixture was cooled to 38°C and kept warm; then AMP-95, silicone leveling agent LE-402, associative water-based resin thickener TK311A and water-based adhesion salt spray resistance accelerator CX80 were added to the reaction container, dispersed, stirred and ground for at least 10 minutes at a temperature of 38°C and a rotation speed of 1500r / min, and naturally cooled to room temperature after reaching the standard viscosity and fineness without bubbles, wherein the viscosity was controlled at 5500-6500mPa.s and the fineness was controlled at 15-20μm; finally, the solution in the reaction container was filtered through a sieve and packaged, wherein the mesh number of the sieve was 1000 meshes.

[0032] The diffuse reflection paint coating of the present invention has the following beneficial effects:

[0033] The invention prepares a special modified filler, and selects a specific content of an OPP matte film water-based matte anti-scratch resin, AMP-95, an organic silicon leveling agent LE-402, an isocyanate crosslinking agent, an associative water-based resin thickener TK311A, and a water-based adhesion salt spray resistance accelerator CX80 to prepare a diffuse reflective coating with excellent comprehensive performance, wherein the visible light diffuse reflectance can reach 98%, the coating has good anti-glare performance, the reflected light is uniform and soft, the wide-angle light output reduces glare, and the coating is dust-proof and dirt-resistant. Under international / national standard testing, the coating has qualified adhesion, impact resistance, weather resistance, high temperature resistance, acid resistance, alkali resistance, and water resistance or no abnormality, good durability, long service life, and can be applied to high temperature ultraviolet radiation resistance and various substrate light source reflection occasions; moreover, the diffuse reflective coating of the invention is environmentally friendly and safe, has a simple preparation process, low construction conditions, is extremely easy to operate, is non-flammable and non-volatile, and has a long storage time. DETAILED DESCRIPTION

[0034] The specific implementation modes of the present invention are further described below in conjunction with examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention.

[0035] Example 1

[0036] This embodiment 1 discloses a diffuse reflective paint coating formula, comprising the ingredients shown in Table 1 below:

[0037] Table 1: Example 1 Diffuse Reflection Paint Coating Formula

[0038]

[0039]

[0040] Example 2

[0041] This embodiment 2 discloses a diffuse reflective paint coating formula, comprising the ingredients shown in Table 2 below:

[0042] Table 2: Example 2 Diffuse Reflection Paint Coating Formula

[0043]

[0044] Example 3

[0045] This embodiment 3 discloses a diffuse reflective paint coating formula, comprising the ingredients shown in Table 3 below:

[0046] Table 3: Example 3 Diffuse Reflection Paint Coating Formula

[0047]

[0048]

[0049] Example 4

[0050] This embodiment 4 discloses a diffuse reflective paint coating formulation, comprising the ingredients shown in Table 4 below:

[0051] Table 4: Example 4 Diffuse Reflection Paint Coating Formula

[0052]

[0053]

[0054] Example 5

[0055] This embodiment 5 discloses a diffuse reflective paint coating formula, comprising the ingredients shown in Table 5 below:

[0056] Table 5: Example 5 Diffuse Reflection Paint Coating Formula

[0057]

[0058] It is worth noting that the specific technical parameters of the water-based resin used in this embodiment are shown in Table 6 below.

[0059] Table 6: Water-based matte anti-scratch resin for OPP matte films described in Examples 1-5 Technical Parameters

[0060]

[0061]

[0062] The water-based resin used in the embodiment of the present invention has a soft and low-gloss film, a finer and more uniform particle size than similar products, and excellent scratch resistance / film flexibility. It is environmentally friendly, does not contain toxic chemicals, has good fire resistance and is non-flammable, has extremely high adhesion to the substrate, and the cured coating has excellent corrosion resistance and chemical resistance, small coating shrinkage, high hardness, good wear resistance, corrosion resistance, and excellent electrical insulation performance.

[0063] In this embodiment, isocyanate is used as a crosslinking agent for the water-based matte anti-scratch resin for OPP matte film, so that the prepared coating has water resistance, wear resistance, scratch resistance, weather resistance and durability, which can greatly improve the performance of the coating.

[0064] The organosilicon leveling agent LE-402 used in this embodiment is a low-viscosity organosilicon leveling agent, which has good compatibility with the water-based matte anti-scratch resin used for OPP matte film, can reduce surface tension, and significantly improve surface leveling. This organosilicon leveling agent is a modified polydimethylsiloxane with a medium molecular weight, which increases smoothness and wear resistance. In the dry film coating, it has low migration, stable dyne value of the dry film coating, improves the feel and fullness of the paint film, does not affect the recoatability, and the dry film coating can be printed (but the addition amount cannot be too high), and has excellent performance in anti-cratering, anti-adhesion, thermal stability, defoaming, etc.

[0065] Specifically, the technical parameters of the organosilicon leveling agent LE-402 are shown in Table 7 below.

[0066] Table 7: Technical parameters of the organosilicon leveling agent LE-402 described in Examples 1-5

[0067] principal component Modified polyether organosiloxane Appearance Colorless or light yellow transparent liquid Active content ＞99.7 Viscosity (25℃) 20-50mPa·S Specific gravity (25℃) 1.016-1.038

[0068] The associative water-based resin thickener TK311A used in this embodiment is a small molecule water-based polyurethane thickener, which can thicken deionized water, has excellent dispersibility, good compatibility, can help wetting and dispersion of pigments in the formula, has high viscosity at low shear, and has strong pseudoplasticity; specifically, the technical parameters of this thickener are shown in Table 8 below.

[0069] Table 8: Technical parameters of the associative waterborne resin thickener TK311A described in Examples 1-5

[0070]

[0071]

[0072] The water-based adhesion salt spray resistance accelerator CX80 used in this embodiment is an auxiliary agent specially used for improving the adhesion of substrates in water-based resin systems. It has good compatibility and can undergo a cross-linking reaction with the carboxyl group in the water-based resin to improve the physical properties of the coating such as the adhesion, water resistance and salt spray resistance of the water-based resin to glass, metal, leather, cloth, minerals, plastics, etc. The molecular chains of the water-based resin emulsion can be connected through carboxyl groups to thereby improve the cross-linking and density between the molecular chains. Since the accelerator itself improves the density of the coating, the salt spray resistance of the coating will also be significantly improved, and yellowing will not occur at high temperatures; not only that, it can also improve the tensile strength of the water-based resin without affecting the elongation, and improve the tear strength and durability.

[0073] Specifically, the technical parameters of this accelerator are shown in Table 9 below.

[0074] Table 9: Technical parameters of the water-based adhesion salt spray resistance accelerator CX80 described in Examples 1-5

[0075]

[0076] Example 6

[0077] This embodiment 6 provides a self-made modified filler, which is prepared according to the following steps:

[0078] (1) Take, by weight, 30 parts of bentonite, 20 parts of barium sulfate, 50 parts of heavy calcium powder, 5 parts of sodium polyacrylate, 300 parts of 0.5% sulfuric acid solution, 20 parts of aluminum hydroxide powder, 30 parts of fluff powder, 10 parts of sorbitan monooleate, 3 parts of methyltriethoxysilane, 2 parts of stearic acid, and 1 part of sodium silicate;

[0079] (2) first pour the sulfuric acid solution into a container, add bentonite, barium sulfate, heavy calcium powder and sodium polyacrylate, stir and mix thoroughly at 75° C., then filter to remove the filtrate, and wash the filter cake with water;

[0080] (3) adding deionized water twice the weight of the filter cake, as well as aluminum hydroxide powder, fluff powder, sorbitan monooleate, and methyltriethoxysilane, and stirring and dispersing at a speed of 1500 r / min for 30 min;

[0081] (4) Finally, add stearic acid and sodium silicate, stir thoroughly, heat to 65°C, ball-mill and dry to obtain a modified filler with a fineness of 15 μm.

[0082] In this embodiment, the prepared modified filler is used as a filler for the water-based matte anti-scratch resin used in the OPP matte film, which plays a relatively stable skeleton role and can significantly improve the wear resistance, heat resistance and corrosion resistance of the water-based resin.

[0083] Example 7

[0084] In view of the diffuse reflective paint formulations described in Examples 1-5, this Example 8 proposes a method for preparing a diffuse reflective paint, which specifically includes the following steps:

[0085] (1) First, an OPP matt film with a water-based matt anti-scratch resin, an isocyanate crosslinking agent and 2 / 3 of the weight of deionized water are placed in a reaction container, and ultrasonically dispersed and stirred for 25 minutes at a heating rate of 2°C / min and a rotation speed of 800r / min, and then naturally cooled to 42°C and kept warm;

[0086] (2) titanium dioxide, modified filler and 1 / 3 weight of deionized water are added to the reaction vessel, dispersed and stirred for 12 minutes at a heating rate of 2°C / min and a rotation speed of 1000 r / min, and then naturally cooled to 38°C and kept warm;

[0087] (3) AMP-95, silicone leveling agent LE-402, associative water-based resin thickener TK311A, and water-based adhesion salt spray resistance accelerator CX80 were then added to the reaction container, dispersed, stirred, and milled at a temperature of 38° C. and a rotation speed of 1500 r / min for at least 10 minutes, and naturally cooled to room temperature (30° C.) after reaching the standard viscosity and fineness without bubbles, wherein the viscosity was controlled at: 5500-6500 mPa.s; the fineness was controlled at 15-20 μm;

[0088] (4) Finally, the solution in the reaction container is filtered through a sieve and packaged to obtain the diffuse reflective paint coating (white emulsion) described in the embodiment of the present invention, wherein the mesh number of the sieve is 1000 meshes.

[0089] In order to verify and compare the performance effects of the coatings of Examples 1-5, the technicians also set up the following comparative examples during the development of the paint.

[0090] Comparative Example 1

[0091] Comparative Example 1 discloses a diffuse reflective coating, which is different from Example 1 only in the water-based resin. The water-based resin of Comparative Example 1 is a commonly used commercially available "acrylic resin".

[0092] Comparative Example 2

[0093] Comparative Example 2 discloses a diffuse reflective coating, which is different from Example 1 only in the filler. The filler used in Comparative Example 2 is the commonly used commercially available "heavy calcium powder".

[0094] Comparative Example 3

[0095] Comparative Example 3 discloses a diffuse reflective coating, which is different from Example 1 only in the leveling agent. The leveling agent used in Comparative Example 3 is a commonly used commercially available "ordinary unmodified silicone leveling agent".

[0096] Comparative Example 4

[0097] Comparative Example 4 discloses a diffuse reflective coating. Compared with Example 1, the only difference is the leveling agent. The leveling agent used in Comparative Example 4 is a commonly used commercially available "acrylic leveling agent".

[0098] Comparative Example 5

[0099] Comparative Example 5 discloses a diffuse reflective coating, which is different from Example 1 only in the cross-linking agent. The cross-linking agent used in Comparative Example 5 is the commonly used commercially available "diisopropylbenzene peroxide".

[0100] Comparative Example 6

[0101] Comparative Example 6 discloses a diffuse reflective coating, which is different from Example 1 only in the thickener. The thickener used in Comparative Example 6 is the commonly used commercially available "methyl cellulose".

[0102] Comparative Example 7

[0103] Comparative Example 7 discloses a diffuse reflective coating. Compared with Example 1, this comparative example only eliminates the use of the ingredient "water-based adhesion salt spray resistance promoter CX80".

[0104] Test example

[0105] The diffuse reflective coatings of Examples 1-5 and Comparative Examples 1-7 were tested according to the contents and methods disclosed in the relevant international standards and domestic standards, wherein the diffuse reflective coating samples prepared in Examples 1-5 are represented by #1-#5, respectively, and the diffuse reflective coating samples prepared in Comparative Examples 1-7 are represented by &1-&7, respectively. The test items are shown in Table 10 below, and the test results are shown in Table 11 below:

[0106] Table 10: Test items

[0107] Serial number Test items Test standards, methods and instruments 1 Diffuse reflectance (visible light) ISO 9050-2003; Integrating sphere; 2 Adhesion(grade) GB / T 9286-1998; White checker knife; 3 Impact resistance (1kg / 100cm) GB / T 1732-1993; Impact resistance tester; 4 Weather resistance (1500h) GB / T 1865-2009; UV weathering test machine; 5 High temperature resistance (120℃) GB / T 1735-1979; drying oven, colorimeter 6 Acid resistance (50h) <![CDATA[GB / T 9274-1988;5%H2SO4 <!-- 9 -->]]> 7 Alkali resistance (500h) <![CDATA[GB / T 9274-1988;5%NaCO3]]> 8 Water resistance (500h) GB / T 1733-1993; Water

[0108] Table 11: Performance data of each sample in the embodiment and comparative example

[0109]

[0110] From the records and statistical data in Table 11, the diffuse reflective coating prepared in Example 1 has the best performance, and its diffuse reflectivity is 1-2 percentage points higher than that of the coatings in other examples, and 3-7 percentage points higher than that of the comparative example coatings; other properties of the coatings in Examples 2-5 (i.e., adhesion, impact resistance, weather resistance, high temperature resistance, acid resistance, alkali resistance, and water resistance) are similar to the test results of Example 1, and are relatively excellent examples;

[0111] In Comparative Example 1, by replacing the water-based resin from the "OPP matte film water-based matte anti-scratch resin" in the original formula with "acrylic resin", the above-mentioned properties of the prepared coating product are significantly reduced. Therefore, the OPP matte film water-based matte anti-scratch resin is irreplaceable as the water-based resin in this formula system, and without it, the expected effect of the present invention cannot be achieved.

[0112] In Comparative Example 2, by replacing the filler from the "modified filler" in the original formula with the commonly used single ingredient "heavy calcium powder", the above-mentioned properties of the prepared coating product are significantly reduced. Therefore, the modified filler is irreplaceable as a skeleton filler in this formula system, and without it, the expected effect of the present invention cannot be achieved.

[0113] Comparative Example 3, by replacing the leveling agent from the "organic silicone leveling agent LE-402" in the original formula with "ordinary unmodified organic silicone leveling agent", the prepared coating product has significantly reduced diffuse reflectivity, adhesion and high temperature resistance. In addition, Comparative Example 4, by replacing the leveling agent from the "organic silicone leveling agent LE-402" in the original formula with "acrylic leveling agent", the prepared coating product has significantly reduced diffuse reflectivity, adhesion, impact resistance, weather resistance, high temperature resistance and water resistance. Therefore, organic silicone leveling agent LE-402 is irreplaceable as a leveling agent in this formula system, and without it, the expected effect of the present invention cannot be achieved.

[0114] In Comparative Example 5, by replacing the crosslinking agent from the "isocyanate crosslinking agent" in the original formula with "diisocyanate peroxide", the above-mentioned properties of the prepared coating product are significantly reduced. Therefore, the isocyanate crosslinking agent is irreplaceable as a unique crosslinking agent in this formula system, and the expected effect of the present invention cannot be achieved without it.

[0115] In Comparative Example 6, by replacing the thickener from the "associative water-based resin thickener TK311A" in the original formula with "methyl cellulose", the prepared coating product has reduced diffuse reflectivity, adhesion, impact resistance, weather resistance and water resistance. Therefore, the associative water-based resin thickener TK311A is irreplaceable as a unique thickener in this formula system, and without it, the expected effect of the present invention cannot be achieved.

[0116] In Comparative Example 7, by deleting the "water-based adhesion salt spray resistance accelerator CX80" in the original formula, the above-mentioned properties of the prepared coating product are significantly reduced. Therefore, the water-based adhesion salt spray resistance accelerator CX80 is irreplaceable as an additional accelerator in this formula system, and the expected effect of the present invention cannot be achieved without it.

[0117] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A diffuse reflective paint, characterized in that: Contains the following ingredients by weight: 350-450 parts of water-based resin; 150-250 parts of modified filler; 40-60 parts of titanium dioxide; AMP-951 - 3 copies; 3-5 parts of leveling agent; 3-5 parts of cross-linking agent; 1-2 parts of thickener; 1-2 parts of accelerator; 170-230 parts of deionized water; The water-based resin is a water-based matte anti-scratch resin for OPP matte film; The modified filler preparation method is as follows: take 30 parts of bentonite, 20 parts of barium sulfate, 50 parts of heavy calcium powder, 5 parts of sodium polyacrylate, 300 parts of 0.5% sulfuric acid solution, 20 parts of aluminum hydroxide powder, 30 parts of fluff powder, 10 parts of sorbitan monooleate, 3 parts of methyltriethoxysilane, 2 parts of stearic acid, and 1 part of sodium silicate by weight; first pour the sulfuric acid solution into a container, add bentonite, barium sulfate, heavy calcium powder and sodium polyacrylate, stir and mix them at 75°C, filter and remove the filtrate, and wash the filter cake with water; then add deionized water twice the weight of the filter cake, as well as aluminum hydroxide powder, fluff powder, sorbitan monooleate, and methyltriethoxysilane, stir and disperse for 30 minutes at a speed of 1500r / min; finally add stearic acid and sodium silicate, stir and mix them, heat to 65°C, ball mill, and dry to obtain a fineness of 15μm; The leveling agent is organic silicon leveling agent LE-402; The cross-linking agent is an isocyanate cross-linking agent; The thickener is an associative water-based resin thickener TK311A; The accelerator is a water-based adhesion salt spray resistance accelerator CX80; The preparation method of the diffuse reflection paint coating comprises the following steps: (1) First, an OPP matt film with a water-based matt anti-scratch resin, an isocyanate crosslinking agent and 2 / 3 of the weight of deionized water are placed in a reaction container, and ultrasonically dispersed and stirred for 25 minutes at a heating rate of 2°C / min and a rotation speed of 800r / min, and then naturally cooled to 42°C and kept warm; (2) titanium dioxide, modified filler and 1 / 3 weight of deionized water are added to the reaction vessel, dispersed and stirred for 12 minutes at a heating rate of 2°C / min and a rotation speed of 1000 r / min, and then naturally cooled to 38°C and kept warm; (3) AMP-95, silicone leveling agent LE-402, associative water-based resin thickener TK311A, and water-based adhesion salt spray resistance accelerator CX80 were then added to the reaction container, dispersed, stirred, and milled at a temperature of 38° C. and a rotation speed of 1500 r / min for at least 10 minutes, and naturally cooled to room temperature after reaching the standard viscosity and fineness without bubbles. The viscosity was controlled at 5500-6500 mPa.s; the fineness was controlled at 15-20 μm; (4) Finally, the solution in the reaction container is filtered through a sieve and packaged, wherein the mesh number of the sieve is 1000 meshes.

2. The diffuse reflective paint coating according to claim 1, characterized in that: Contains the following ingredients by weight: 350 parts of water-based resin; 150 parts of modified filler; 40 parts of titanium dioxide; AMP - 951 copies; 3 parts of leveling agent; 3 parts of cross-linking agent; 1 part thickener; 1 part of accelerator; 170 parts of deionized water.

3. The coating according to claim 1 is used in applications where high temperature ultraviolet radiation resistance and substrate light source reflection are required.

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