Method for judging uniformity of titanium dioxide aluminum coating layer
By performing energy dispersive spectroscopy (EDS) spot scanning under a scanning electron microscope, the mass ratio and standard deviation of aluminum and titanium elements were calculated, solving the problem of the difficulty in quantitatively assessing the uniformity of the aluminum coating layer of titanium dioxide, and achieving product quality stability and performance improvement.
Patent Information
- Application Number
- CN202511160201.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-19
- Publication Date
- 2025-11-07
AI Technical Summary
Existing technologies make it difficult to quantitatively assess the uniformity of the aluminum coating layer of titanium dioxide, leading to problems such as color difference, chalking, yellowing, and poor dispersion in the product, increasing production costs and the risk of customer complaints.
By performing energy dispersive spectroscopy (EDS) point scanning under a scanning electron microscope, the mass ratio, average value, and standard deviation of aluminum and titanium elements at each scanning point are calculated. The differences in the aluminum and titanium element ratios at different points are compared, and the uniformity of the aluminum coating layer is determined if the standard deviation is less than 0.005.
This enables quantitative evaluation of aluminum cladding layers, improves product quality stability and application performance, reduces performance differences between product batches, and lowers production adjustment costs.
Smart Images
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Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of chemical industry, and particularly relates to a method for judging uniformity of an aluminum coating layer of titanium dioxide. BACKGROUND
[0002] The uniformity of the aluminum coating layer of titanium dioxide is a key factor for determining whether the core performance (optics, weather resistance) and application performance (dispersion) of a product reach high standards and are stable and reliable. Non-uniform coating can directly cause problems such as color difference, powdering, yellowing, poor dispersion and the like of the product, and seriously reduces the quality and service life of the final product. Poor control of the uniformity of the aluminum coating also causes performance differences (such as hue, whiteness, weather resistance, dispersibility) between batches of products, which increases the production adjustment cost of downstream customers, and even causes the products to be unqualified or to be complained. Therefore, in the production of titanium dioxide, fine control of the aluminum coating process and the use of effective characterization means to monitor the uniformity of the coating layer are core links for guaranteeing the stability of product quality and market competitiveness.
[0003] Currently, the commonly used methods for judging the uniformity of the aluminum coating include: ①directly observing the thickness and continuity of the coating on the surface of a single particle by a transmission electron microscope; ②observing whether the distribution of aluminum elements on the surface of a particle and aggregates is uniform by a scanning electron microscope combined with an element area distribution map; and ③indirectly evaluating the improvement effect of the uniformity by testing the weather resistance, dispersibility, optical performance and the like of samples of different batches or before and after optimization. However, these methods can only qualitatively judge the uniformity of the aluminum coating, and have problems such as high cost, poor representativeness due to small observation range and the like. SUMMARY
[0004] Therefore, the purpose of the present application is to provide a method for judging the uniformity of the aluminum coating layer of titanium dioxide, which can quantitatively and effectively judge the uniformity of the aluminum coating layer, so as to provide a direction for improving or enhancing the aluminum coating effect.
[0005] The present application provides a method for judging the uniformity of the aluminum coating layer of titanium dioxide, comprising the following steps:
[0006] (1) performing multiple energy spectrum point scanning on an aluminum-coated titanium dioxide sample;
[0007] (2) calculating the mass ratio, average value and standard deviation of aluminum elements and titanium elements in each scanning point;
[0008] (3) comparing the difference in the ratio of aluminum elements and titanium elements at different points;
[0009] and the aluminum-coated titanium dioxide is uniform when the standard deviation is less than 0.005.
[0010] Preferably, the standard deviation is in the range of 0.005-0.10, and the aluminum-coated layer of the titanium dioxide is relatively uniform; the standard deviation can be 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.10.
[0011] Preferably, the standard deviation is greater than 0.10, and the aluminum-coated layer of the titanium dioxide is not uniform.
[0012] Preferably, not less than 5 points are randomly selected for energy spectrum point scanning; the number of points can be 6, 7, 8, 9, 10, 11, 12, 13 or 14.
[0013] Preferably, 6-8 energy spectrum points are randomly selected for scanning.
[0014] Preferably, a scanning electron microscope is used for energy spectrum point scanning.
[0015] Preferably, the standard deviation is less than 0.004.
[0016] Preferably, the standard deviation is less than 0.0035; the standard deviation can be 0.0035, 0.0034, 0.0033, 0.0032, 0.0031, 0.0030, 0.0025, 0.0020, 0.0015, 0.0010 or 0.0005.
[0017] Preferably, the particle size of the aluminum-coated titanium dioxide sample is 5-450 nm.
[0018] Preferably, the uniformity of the aluminum-coated layer of the titanium dioxide is related to the water-based fineness or hiding power.
[0019] The present application compares the difference in the ratio of aluminum element and titanium element at different points, and the range of the difference is not specifically required. Different types of products have different aluminum coating amounts, and the difference range of the aluminum-titanium ratio of the corresponding products is different.
[0020] The present application provides a method for determining the uniformity of the aluminum-coated layer of titanium dioxide, which comprises the following steps:
[0021] (1) multiple energy spectrum point scanning of the aluminum-coated titanium dioxide sample; (2) calculation of the mass ratio, average value and standard deviation of aluminum element and titanium element in each scanning point; (3) comparison of the difference in the ratio of aluminum element and titanium element at different points; and the standard deviation is less than 0.005, and the aluminum-coated layer of the titanium dioxide is uniform. The method can quantitatively and effectively determine the uniformity of the aluminum-coated layer, thereby providing a direction for improving or enhancing the aluminum coating effect. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1SEM image of the aluminum coated titanium dioxide sample of Example 1 of the present application;
[0023] Figure 2 SEM image of the aluminum coated titanium dioxide sample of Example 2 of the present application;
[0024] Figure 3 SEM image of the aluminum coated titanium dioxide sample of Example 3 of the present application. DETAILED DESCRIPTION
[0025] In order to further illustrate the present application, a method for determining the uniformity of the aluminum coating layer of titanium dioxide provided by the present application is described in detail below in conjunction with examples, but they should not be understood as limiting the scope of protection of the present application.
[0026] Example 1
[0027] (1) The aluminum coated titanium dioxide sample 1# was subjected to energy spectrum point scanning under a scanning electron microscope, and 7 points were randomly selected for point scanning, and the results are shown in Table 1: Figure 1 ;
[0028] (2) The mass ratio of aluminum element and titanium element of each scanning point was calculated, and the results are shown in Table 1:
[0029] (3) The difference in the ratio of aluminum element and titanium element of different points was compared, the minimum value was 0.016, the maximum value was 0.650, the average value was 0.253, and the standard deviation was 0.234, the difference in the ratio of aluminum and titanium between the points was large, indicating that the aluminum coating was not uniform;
[0030] (4) The standard deviation of the ratio of aluminum and titanium between the points was 0.234, which was much larger than 0.01, and it could be determined that the aluminum film coating of the 1# sample was extremely uneven, and it was necessary to improve the aluminum coating process.
[0031] Table 1
[0032]
[0033] Example 2
[0034] (1) The aluminum coated titanium dioxide sample 2# was subjected to energy spectrum point scanning under a scanning electron microscope, and 6 points were randomly selected for point scanning, and the results are shown in Table 2: Figure 2 ;
[0035] (2) The mass ratio of aluminum element and titanium element of each scanning point was calculated, and the results are shown in Table 2:
[0036] (3) The difference in the ratio of aluminum element and titanium element of different points was compared, the minimum value was 0.015, the maximum value was 0.0276, the average value was 0.0231, and the difference between the points was not large, indicating that the aluminum coating was relatively uniform;
[0037] (4) The standard deviation of the Al / Ti ratio between points is 0.009, which is in the range of 0.005-0.010, and it can be determined that the aluminum film of the 2# sample is evenly coated, and the aluminum coating process has a small optimization space.
[0038] Table 2
[0039]
[0040] Example 3
[0041] (1) The aluminum-coated titanium dioxide sample 3# was subjected to energy spectrum point scanning under a scanning electron microscope, and 8 points were randomly selected for point scanning. The results are shown in Table 3. Figure 3
[0042] (2) The mass ratio of aluminum and titanium elements at each scanning point was calculated, and the results are shown in Table 3.
[0043] (3) The difference in the Al / Ti ratio of different points was compared, with the minimum value being 0.021, the maximum value being 0.031, and the average value being 0.026. The difference between points is very small, indicating that the aluminum coating is very uniform.
[0044] (4) The standard deviation of the Al / Ti ratio between points is 0.0033, which is less than 0.005, and it can be determined that the aluminum film of the 3# sample is very evenly coated, and there is no need to optimize the aluminum coating process.
[0045] Table 3
[0046]
[0047] The water dispersibility of the samples of Examples 1-3 above corresponding to titanium dioxide is shown in Table 4.
[0048] Table 4 Dispersibility and hiding power of products corresponding to examples
[0049] Sample No. Standard deviation of Al / Ti ratio Judgment result of Al film uniformity Product water fineness Hiding power / % Example 1 0.234 Not uniform 60 μm 96.85 Example 2 0.009 Relatively uniform 45 μm 97.76 Example 3 0.0033 Very uniform 35 μm 98.68
[0050] The smaller the water fineness value, the better the dispersibility of the product. The hiding power test uses the contrast ratio method, and the closer the value is to 100%, the better the hiding performance of the product. As shown in Table 4, the results obtained by using the aluminum film uniformity detection method of the present application are highly consistent with the application performance test of titanium dioxide.
[0051] From the above embodiment, the application provides a method for judging uniformity of aluminum coated layer of titanium dioxide, comprising the following steps: (1) performing multiple energy spectrum point scanning on the aluminum coated titanium dioxide sample; (2) calculating the mass ratio of aluminum element and titanium element, the average value and the standard deviation of each scanning point; (3) comparing the difference of the ratio of aluminum element and titanium element of different points; and the aluminum coated layer coated titanium dioxide is uniform when the standard deviation is less than 0.005. The method can realize quantitative and effective judgment of the uniformity of the aluminum coated layer, thereby providing a direction for improving or enhancing the aluminum coating effect.
[0052] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.
Claims
1. A method for determining the uniformity of an aluminum coated layer of titanium dioxide, comprising the steps of: (1) performing multiple energy spectrum point scans on an aluminum coated titanium dioxide sample; (2) calculating the mass ratio of aluminum and titanium elements, the average value and the standard deviation of each scanning point; (3) comparing the differences in the ratio of aluminum and titanium elements of different points; and a standard deviation less than 0.005, indicating that the aluminum coated layer of titanium dioxide is uniform.
2. The method of claim 1, wherein, a standard deviation in the range of 0.005-0.10, indicating that the aluminum coated layer of titanium dioxide is relatively uniform.
3. The method of claim 1, wherein, a standard deviation greater than 0.10, indicating that the aluminum coated layer of titanium dioxide is not uniform.
4. The method of claim 1, wherein, randomly selecting no less than 5 points for energy spectrum point scanning.
5. The method of claim 4, wherein, randomly selecting 6-8 energy spectrum points for scanning.
6. The method of claim 1, wherein, using a scanning electron microscope for energy spectrum point scanning.
7. The method of claim 1, wherein, a standard deviation less than 0.
004.
8. The method of claim 1, wherein, a standard deviation less than 0.0035.
9. The method of claim 1, wherein, the particle size of the aluminum coated titanium dioxide sample is 5-450 nm.
10. The method of claim 1, wherein, the uniformity of the aluminum coated layer of titanium dioxide is related to the water-based fineness or hiding power.