Diffuse reflection coating as well as preparation method and application thereof

Abstract

The invention relates to the technical field of coating production, and discloses a diffuse reflection coating as well as a preparation method and application thereof. The diffuse reflection coating comprises: 5-10 parts of an aqueous hydroxy acrylic resin; 10 to 15 parts of water-borne epoxy resin; 0-5 parts of a repairing functional material; 80 to 100 parts of a reflective filler; 0.2-1 part of a wetting dispersant; 0.2 to 1 part of a defoaming agent; 0.2 to 1 part of a thickening agent; and 50 to 100 parts of water. The diffuse reflection coating can be suitable for preparing the diffuse reflection coating on the inner wall of the integrating sphere, and the durability of the diffuse reflection coating on the inner wall of the integrating sphere is improved.

Description

Technical Field

[0001] The present application relates to the technical field of coating production, and more specifically, to a diffuse reflection coating suitable for the inner wall of an integrating sphere, and a preparation method and application thereof. Background Art

[0002] The inner wall of the integrating sphere is a white diffuse reflection layer, and each point on the inner wall of the sphere diffuses evenly. It can not only collect all the reflected light from the sample, but also the light reflected to the receiver from each part of the sphere wall is symmetrical and has nothing to do with the angular distribution of the reflection. This performance is closely related to the structure of the sphere and the inner coating.

[0003] In order to ensure that the coating has a high diffuse reflectivity, the filler content that provides the diffuse reflective function is generally high, which often leads to poor adhesion between the coating and the substrate.

[0004] Due to the aging resistance and optical properties of the organic resin binder and diffuse reflective filler in the coating, the coating on the inner wall of the integrating sphere is prone to yellowing and aging, which shortens the service life of the integrating sphere. Polyvinyl alcohol, while environmentally friendly, is not water-resistant and can only be used indoors, with poor durability. Acrylic emulsions offer acceptable water and weather resistance, but lack high-temperature resistance, making them suitable only for less demanding applications.

[0005] In addition, due to the influence of different construction techniques (brush coating, roller coating, spraying) and coating combination and thickness, the microscopic morphology of the coating varies, the uniformity of diffuse reflection cannot be achieved, and a thicker coating is required to achieve a higher reflectivity.

[0006] In summary, commonly used adhesives for coatings, such as acrylic and epoxy resins, readily absorb UV light and age, causing yellowing and degradation, which can affect integrating sphere spectral measurement data. In severe cases, they can also cause cracking, powdering, and shedding. Integrating spheres are precision measuring instruments, with optical spheres at least 2 meters in diameter. Repair work is labor-intensive and costly, making improving coating durability a pressing issue. Summary of the Invention

[0007] The invention of this application aims to solve the problem of poor durability of the inner wall coating of the existing integrating sphere.

[0008] In order to achieve the above-mentioned invention objectives, this application adopts the following technical solutions:

[0009] In a first aspect, the present application provides a diffuse reflective coating, calculated by weight, comprising:

[0010] 5-10 parts of water-based hydroxy acrylic resin;

[0011] 10-15 parts of water-based epoxy resin;

[0012] 0-5 copies of repair functional materials;

[0013] 80-100 parts of reflective filler;

[0014] Wetting and dispersing agent 0.2-1 part;

[0015] Defoaming agent 0.2-1 part;

[0016] Thickener 0.2-1 part;

[0017] 50-100 parts of water.

[0018] Furthermore, the functional repair material, calculated by weight, includes:

[0019] 74 parts of calcium hydroxide;

[0020] 100 parts of calcium carbonate;

[0021] 116 parts of butenedioic acid;

[0022] 200 parts water.

[0023] Furthermore, the preparation method of the functional repair material comprises: adding calcium hydroxide to water, stirring, adding calcium carbonate and succinic acid, continuing stirring, and spray drying after the stirring is completed to obtain a functional repair material powder. Preferably, calcium hydroxide is added to water, stirred at a speed of 100 r / min for 15 minutes, then calcium carbonate and succinic acid are added, stirred for 1 hour, and then dehydrated by spray drying after the reaction is complete to obtain the functional repair material powder.

[0024] Furthermore, the water-based hydroxylated acrylic resin is preferably a water-based hydroxylated acrylic resin having a molecular weight of less than 20,000, and the water-based epoxy resin is preferably a water-based epoxy resin having a molecular weight of greater than 100,000.

[0025] Furthermore, the reflective filler, calculated by weight, comprises:

[0026] 20-30 parts of zirconium dioxide;

[0027] 80-100 parts of titanium dioxide;

[0028] 50-60 parts of water.

[0029] Furthermore, the reflective filler is prepared by adding titanium dioxide to water, stirring and dispersing the mixture, adding zirconium dioxide while stirring, and continuing to stir and mix to obtain the reflective filler. Preferably, titanium dioxide is added to water, dispersed at a speed of 5000 r / min for 15 minutes, and zirconium dioxide is added while stirring and mixed for 10 minutes to obtain the reflective filler.

[0030] Furthermore, the zirconium dioxide is preferably 1000 mesh, and the titanium dioxide is preferably 500 mesh.

[0031] Furthermore, the diffuse reflective coating, calculated by weight, comprises:

[0032] 5 parts of water-based hydroxy acrylic resin;

[0033] 10 parts of water-based epoxy resin;

[0034] 2 copies of functional repair materials;

[0035] 90 parts of reflective filler;

[0036] 0.2 parts of wetting and dispersing agent;

[0037] 0.2 parts of defoaming agent;

[0038] 0.2 parts of thickener;

[0039] 100 parts water.

[0040] In a second aspect, the present application provides a method for preparing any of the above-mentioned diffuse reflective coatings, comprising the following steps:

[0041] preparing restorative functional materials and reflective fillers respectively;

[0042] The various raw materials are mixed to obtain the diffuse reflection paint.

[0043] In a third aspect, the present application provides the use of any of the above-mentioned diffuse reflection coatings in the preparation of a diffuse reflection coating for the inner wall of an integrating sphere.

[0044] This application uses a water-based hydroxylated acrylic resin with a relatively low molecular weight (less than 20,000) compounded with a high molecular weight water-based epoxy resin (molecular weight greater than 100,000). Both main resins have excellent filler wettability and can be added and coated with a large amount of fillers. The epoxy resin provides bonding and a framework structure, while the water-based hydroxylated acrylic resin is coated on the filler surface. On the one hand, it acts as an organic filler to improve the density and bonding strength of the coating. On the other hand, the hydroxyl groups in the water-based hydroxylated acrylic resin can form hydrogen bonds with the hydroxyl groups in the epoxy resin, forming a strong adhesion.

[0045] The repair functional material of the present application combines with moisture in the air to form crystals after the coating is damaged, and adheres the linear frame of the water-based epoxy resin. After the structure is tightened, new hydrogen bonds are formed between the filler and the epoxy resin structure through the hydroxyl acrylic resin particles. After the process is completed, a dense coating structure is re-formed, and the crystals disappear due to the removal of moisture.

[0046] Titanium dioxide used alone as a radiation filler has poor resistance to ultraviolet aging. Therefore, the reflective filler of the present application uses zirconium dioxide coated titanium dioxide to shield light, thereby improving the diffuse reflectivity and the covering property.

[0047] In summary, compared to the prior art, this application significantly improves the durability of the coating after film formation through the synergistic compounding of the main resin, the addition of the repair functional material, and the synergistic compounding of the radioactive filler. Therefore, this diffuse reflective coating can be used to prepare a diffuse reflective coating on the inner wall of an integrating sphere, thereby improving the durability of the diffuse reflective coating on the inner wall of the integrating sphere. DETAILED DESCRIPTION

[0048] The technical solutions and effects of the present application are further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention, rather than to limit the invention.

[0049] Examples 1-3

[0050] This embodiment discloses a diffuse reflective coating, and the raw materials used for its preparation are shown in the following table (unit: parts by weight):

[0051] Table 1 The amount of raw materials used in the diffuse reflection coating and the performance test results of the diffuse reflection layer after curing

[0052]

[0053]

[0054] Among the above raw materials:

[0055] The water-based hydroxylated acrylic resin is a water-based hydroxylated acrylic resin having a molecular weight of less than 20,000 (15,000 in this embodiment);

[0056] The waterborne epoxy resin is a waterborne epoxy resin having a molecular weight greater than 100,000 (800,000 in this embodiment);

[0057] The repair functional material is prepared from 74 parts of calcium hydroxide, 100 parts of calcium carbonate, 116 parts of succinic acid, and 200 parts of water by the following steps: adding calcium hydroxide to water, stirring at a speed of 100 r / min for 15 minutes, adding calcium carbonate and succinic acid, stirring for 1 hour, and then dehydrating by spray drying to obtain a repair functional material powder;

[0058] The reflective filler is prepared from 20 parts of zirconium dioxide, 100 parts of titanium dioxide, and 60 parts of water by the following steps: adding titanium dioxide to water, dispersing at a speed of 5000 r / min for 15 minutes, adding zirconium dioxide while stirring, and mixing for 10 minutes to obtain the reflective filler; wherein the zirconium dioxide is 1000 mesh and the titanium dioxide is 500 mesh;

[0059] BYK 346 was selected as the wetting and dispersing agent;

[0060] The defoaming agent is BYK028;

[0061] The thickener used is BYK420.

[0062] As can be seen from Table 1, Example 1 is a preferred example. Through the coordinated compounding of the main resin, the addition of the repair functional material, and the coordinated compounding of the radioactive filler, the durability of the coating after film formation is significantly improved.

[0063] In Example 2, since no functional repair material is added, the coating is damaged after aging and the reflectivity loss is high.

[0064] In Example 3, due to excessive addition of acrylic resin, the diffuse reflectivity improvement effect is not obvious, but the reflectivity loss after aging is high.

[0065] Examples 4-6

[0066] This embodiment discloses a diffuse reflective coating, which differs from the embodiment 1 only in that the raw materials used for preparation are shown in the following table (unit: parts by weight):

[0067] Table 2 Diffuse reflection coating raw material dosage and performance test results of the diffuse reflection layer after curing film formation

[0068]

[0069]

[0070] As can be seen from Table 2, Example 1 is a preferred example. Through the coordinated compounding of the main resin, the addition of the repair functional material, and the coordinated compounding of the radioactive filler, the durability of the coating after film formation is significantly improved.

[0071] In Example 4, the increase in the amount of repair functional material added did not significantly improve the reflectivity loss. Considering the cost, Example 1 is better than Example 4.

[0072] Compared with Example 2, Example 5 increases the amount of water-based epoxy emulsion added. Although the increase in the epoxy ratio improves the adhesion and strength of the coating to a certain extent, the increase in the proportion of resin in the coating causes a slight decrease in diffuse reflectivity, and the epoxy resin has poor aging resistance, resulting in increased reflectivity loss.

[0073] In Example 6, the amount of waterborne epoxy resin added is increased compared to Example 5, and the diffuse reflectivity decreases slightly. However, due to the addition of the repair functional material, the reflectivity loss is lower than that of Example 5.

[0074] Examples 7-8

[0075] This embodiment discloses a diffuse reflective coating, which differs from the embodiment 1 only in that the molecular weights of the waterborne hydroxy acrylic resin and the waterborne epoxy resin are different, as shown in the following table:

[0076] Table 3 Selection of main resin of diffuse reflection coating and performance test results of diffuse reflection layer after curing film

[0077]

[0078]

[0079] As can be seen from Table 3, Example 1 is a preferred example. The durability of the coating after film formation is significantly improved through the coordinated compounding of the main resins.

[0080] The water-based hydroxy acrylic resin of Example 7 has a high molecular weight and produces weak synergistic links, which leads to increased reflectivity loss and poor durability. In addition, changes in the structure lead to a certain degree of decrease in reflectivity.

[0081] The waterborne epoxy of Example 8 has a lower molecular weight and has less effect on diffuse reflectivity, but is more susceptible to aging, resulting in high emissivity loss.

[0082] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A diffuse reflective coating, characterized in that: Calculated by weight, including: 5-10 parts of water-based hydroxy acrylic resin; 10-15 parts of water-based epoxy resin; 0-5 copies of repair functional materials; 80-100 parts of reflective filler; Wetting and dispersing agent 0.2-1 part; Defoaming agent 0.2-1 part; Thickener 0.2-1 part; 50-100 parts of water.

2. The diffuse reflective paint according to claim 1, characterized in that: The functional repair material, calculated by weight, includes: 74 parts of calcium hydroxide; 100 parts of calcium carbonate; 116 parts of butenedioic acid; 200 parts water.

3. The diffuse reflective paint according to claim 2, characterized in that: The preparation method of the repair functional material comprises the following steps: adding calcium hydroxide into water, stirring, adding calcium carbonate and butenedioic acid, continuing stirring, and spray drying after stirring to obtain the repair functional material powder.

4. The diffuse reflective paint according to claim 1, characterized in that: The waterborne hydroxy acrylic resin is preferably a waterborne hydroxy acrylic resin having a molecular weight of less than 20,000, and the waterborne epoxy resin is preferably a waterborne epoxy resin having a molecular weight of greater than 100,000.

5. The diffuse reflective paint according to claim 1, characterized in that: The reflective filler, calculated by weight, comprises: 20-30 parts of zirconium dioxide; 80-100 parts of titanium dioxide; 50-60 parts of water.

6. The diffuse reflective paint according to claim 5, characterized in that: The reflective filler is prepared by adding titanium dioxide into water, stirring and dispersing the titanium dioxide, adding zirconium dioxide while stirring, and continuing to stir and mix to obtain the reflective filler.

7. The diffuse reflective paint according to claim 5, characterized in that: The zirconium dioxide is preferably 1000 mesh, and the titanium dioxide is preferably 500 mesh.

8. The diffuse reflective paint according to claim 1, characterized in that: Calculated by weight, including: 5 parts of water-based hydroxy acrylic resin; 10 parts of water-based epoxy resin; 2 copies of functional repair materials; 90 parts of reflective filler; 0.2 parts of wetting and dispersing agent; 0.2 parts of defoaming agent; 0.2 parts of thickener; 100 parts water.

9. The method for preparing the diffuse reflective coating according to any one of claims 1 to 8, characterized in that: The following steps are involved: preparing restorative functional materials and reflective fillers respectively; The various raw materials are mixed to obtain the diffuse reflection paint.

10. Use of the diffuse reflection coating according to any one of claims 1 to 8 in preparing a diffuse reflection coating for the inner wall of an integrating sphere.

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