Method for measuring hardness of titanium dioxide product

Abstract

The invention relates to the technical field of titanium dioxide product hardness measurement, and provides a titanium dioxide product hardness measurement method, which comprises: uniformly mixing titanium dioxide and a first organic polymer, heating, melting, and cooling to obtain a mixture in a second state, and measuring the hardness of the mixture in the second state, namely the hardness value of the titanium dioxide product. According to the embodiment of the invention, the titanium dioxide and the first organic polymer are mixed, heated and cooled to obtain the solid mixture, so that the accurate hardness of the mixture can be measured, and the hardness measurement precision of the titanium dioxide product is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hardness measurement of titanium dioxide products, and particularly to a method for measuring the hardness of titanium dioxide products. Background Art

[0002] Titanium dioxide is a soft, odorless and tasteless white powder with strong covering power and coloring power. The hardness of titanium dioxide products is affected by various factors such as production processes and particle fineness. Different production processes will result in different crystal forms, sizes and distributions of titanium dioxide particles, thus affecting their hardness.

[0003] Currently, the common method for measuring the hardness of titanium dioxide products is the Mohs measurement method, that is, evaluating the hardness of titanium dioxide products through a Mohs hardness tester. This method cannot obtain the accurate hardness of titanium dioxide products, but only the hardness range of titanium dioxide products, and the measurement accuracy is relatively low. Summary of the Invention

[0004] In view of this, the present invention provides a method for measuring the hardness of titanium dioxide products, which solves the problem of relatively low accuracy in measuring the hardness of titanium dioxide products by using a Mohs hardness tester in the prior art.

[0005] On the one hand, an embodiment of the present invention provides a method for measuring the hardness of titanium dioxide products. The method for measuring the hardness of titanium dioxide products includes: mixing titanium dioxide with a first organic polymer evenly, heating and melting the mixture, and then cooling it to obtain a mixture in a second state, and measuring the hardness of the mixture in the second state, which is the hardness value of the titanium dioxide product.

[0006] In some embodiments, mixing titanium dioxide with a first organic polymer evenly, heating and melting the mixture, and then cooling it to obtain a mixture in a second state, and measuring the hardness of the mixture in the second state, which is the hardness value of the titanium dioxide product includes: Mixing titanium dioxide with a powdery first organic polymer to obtain a mixture; Heating the mixture to obtain a mixture in a first state; After the mixture in the first state is cooled, a mixture in a second state is obtained, and the hardness of the mixture in the second state is measured based on a Shore hardness tester.

[0007] In some embodiments, the mixing titanium dioxide with a powdery first organic polymer to obtain a mixture includes: Adding the titanium dioxide and the first organic polymer into a sealing device; Oscillating the sealing device loaded with the titanium dioxide and the first organic polymer based on a mixer to obtain the evenly mixed titanium dioxide and first organic polymer; Take out the uniformly mixed titanium dioxide and the first organic polymer from the sealing device to obtain a mixture.

[0008] In some embodiments, mixing titanium dioxide with a powdery first organic polymer to obtain a mixture includes: Mix titanium dioxide and the first organic polymer according to the following weight ratio relationship to obtain a mixture, where the weight ratio relationship is titanium dioxide : (first organic polymer + titanium dioxide) within the range of (8 - 10) : 100. In some embodiments, heating the mixture to obtain a mixture in the first state includes: Place the mixture in a metal container, and place the metal container carrying the mixture in an oven for heating; When the duration for the oven temperature to reach the set temperature meets the preset duration, obtain a mixture in the first state, and take out the metal container carrying the mixture in the first state from the oven.

[0009] In some embodiments, the first organic polymer includes resin; the first state is liquid, the second state is solid; the preset duration is (20 - 30) min.

[0010] In some embodiments, the addition amount of the mixture added to the metal container is such that after the mixture in the first state melts, the height in the metal container is greater than 6 mm.

[0011] In some embodiments, the cross-sectional length of the metal container in the horizontal direction is not less than 40 mm.

[0012] In some embodiments, after the mixture in the first state cools, measuring the hardness of the cooled mixture in the second state based on a Shore hardness tester includes: after the mixture in the first state cools, obtain a mixture in the second state; select a number of first measurement points on the surface of the mixture in the second state, and measure the hardness of the number of first measurement points based on a Shore hardness tester; based on the hardness average value of the number of first measurement points, obtain the hardness of the titanium dioxide product.

[0013] In some embodiments, the distance between any two of the number of first measurement points is greater than 10 mm.

[0014] The present invention has at least the following beneficial effects: The present invention provides a method for measuring the hardness of a titanium dioxide product. The method for measuring the hardness of the titanium dioxide product includes: mixing titanium dioxide with a powdery first organic polymer to obtain a mixture; heating the mixture to obtain a mixture in a first state; after the mixture in the first state is cooled, measuring the hardness of the cooled mixture in a second state based on a Shore hardness tester. By mixing, heating, and cooling titanium dioxide and the first organic polymer, a solid mixture can be obtained, and the hardness of the mixture can be accurately measured by the Shore hardness tester. Thus, the accuracy of measuring the hardness of the titanium dioxide product is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other embodiments can be obtained based on these drawings.

[0016] Figure 1 It is a flowchart of a method for measuring the hardness of a titanium dioxide product provided by an embodiment of the present invention; Figure 2 It is a flowchart of a method for measuring the hardness of a titanium dioxide product provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the following further describes the embodiments of the present invention in detail with reference to specific embodiments and the accompanying drawings.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs; the terms used in the description of the present invention in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, the terms "length", "width", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position based on the orientation or position shown in the drawings, which is only for convenience of description and cannot be construed as a limitation to the technical solution of the present invention.

[0019] The terms "including" and "having" and any variations thereof in the description and claims of the present invention and the above description of the drawings are intended to cover non-exclusive inclusion; the terms "first", "second", etc. in the description and claims of the present invention or the above drawings are used to distinguish different objects and are not used to describe a specific order. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0020] In the specification and claims of the present invention and the above-mentioned drawings, when an element is referred to as being "fixed to" or "mounted on" or "disposed on" or "connected to" another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it may be directly or indirectly connected to the other element.

[0021] Titanium dioxide is a soft, odorless, white powder with strong hiding and tinting power. Different types of titanium dioxide products have different hardness. Titanium dioxide is divided into rutile type (R type) and anatase type (A type). The density of rutile type (R type) is 4.26g / cm 3 , refractive index 2.72. R-type titanium dioxide has good weather resistance, water resistance and is not easy to turn yellow, but its whiteness is slightly poor. Anatase (A-type) density 3.84g / cm 3 , refractive index 2.55. Type A titanium dioxide has poor light resistance and is not resistant to weathering, but has good whiteness. The hardness of titanium dioxide products is also affected by many factors such as production process and particle fineness. Different production processes will cause different crystal forms, sizes and distributions of titanium dioxide particles, thus affecting their hardness. For example, titanium dioxide particles that have been calcined at high temperatures and finely ground are more uniform and delicate, and have relatively high hardness. For example, the hardness of titanium dioxide products obtained by coating titanium dioxide with different coating agents is also different. In addition, the finer the particles, the larger the surface area, and the stronger the bonding force between the particles, thereby improving the hardness of titanium dioxide products. The current hardness measurement method for titanium dioxide products is usually the Mohs measurement method, that is, the hardness of titanium dioxide products is evaluated by a Mohs hardness tester. Mohs hardness is a relative hardness that evaluates the hardness of minerals by comparing the scratches or wear between different minerals. This hardness test method is simple and intuitive, but it can only obtain the hardness range of titanium dioxide products, and the measurement accuracy is relatively low, and it is impossible to accurately obtain a specific hardness value.

[0022] In view of this, in order to solve the above technical problems, an embodiment of the present invention provides a method for measuring the hardness of a titanium dioxide product. By uniformly mixing titanium dioxide and a first organic polymer, heating to melt and cooling the mixture, a mixture in a second state can be obtained. By measuring the hardness of the mixture in the second state, the precise hardness value of the titanium dioxide product can be obtained, thereby improving the accuracy of the hardness measurement of the titanium dioxide product.

[0023] The present invention is described in detail below in conjunction with embodiments and drawings.

[0024] The first aspect of the embodiment of the present invention provides a method for measuring the hardness of a titanium dioxide product. Figure 1 As shown, the method for measuring the hardness of titanium dioxide products includes steps S10 to S30.

[0025] S10. Mix titanium dioxide with the powdery first organic polymer to obtain a mixture.

[0026] The first organic polymer can be a resin. For example, PP (polypropylene) resin, PE (polyethylene) resin, etc.

[0027] Mix a small amount of titanium dioxide evenly with the powdery first organic polymer to obtain a uniformly mixed mixture.

[0028] S20. Heat the mixture to obtain a mixture in the first state.

[0029] Heat the granular mixture. After heating to a certain temperature, keep it warm so that the granular mixture can be fully melted to obtain a liquid or semi - liquid mixture. The heating temperature is determined by the type of the first organic polymer.

[0030] In some examples, if the first organic polymer is HDPE resin, the heating temperature corresponding to HDPE resin is greater than or equal to 130 °C. For example, 135 °C, 140 °C or 150 °C.

[0031] In some examples, if the first organic polymer is LDPE resin, the heating temperature corresponding to LDPE resin is greater than or equal to 110 °C. For example, 115 °C, 120 °C or 130 °C.

[0032] In some examples, if the first organic polymer is PP resin, the heating temperature corresponding to PP resin is greater than or equal to 160 °C. For example, 165 °C, 170 °C or 180 °C.

[0033] S30. After the mixture in the first state cools down, obtain a mixture in the second state and measure the hardness of the mixture in the second state based on a Shore hardness tester.

[0034] After the liquid or semi - liquid mixture cools down, obtain a solid mixture and measure the exact hardness of the solid mixture with a Shore hardness tester.

[0035] The Shore hardness tester includes a dial, a pointer mounted on the dial, a piercing needle, and a spring connected between the pointer and the piercing needle. When measuring, insert the piercing needle into the surface of the solid mixture, and the value shown by the pointer on the dial is the hardness value.

[0036] The solution of the present invention can obtain a solid mixture by mixing, heating, and cooling titanium dioxide and the first organic polymer, and can accurately measure the hardness of the mixture with a Shore hardness tester. Thus, the accuracy of measuring the hardness of titanium dioxide products is improved.

[0037] In some embodiments of the present invention, step S10 (mixing titanium dioxide with a powdery first organic polymer to obtain a mixture) may include: adding titanium dioxide and the first organic polymer into a sealing device; oscillating the sealing device loaded with titanium dioxide and the first organic polymer based on a mixer to obtain uniformly mixed titanium dioxide and the first organic polymer; taking out the uniformly mixed titanium dioxide and the first organic polymer from the sealing device to obtain a mixture.

[0038] The sealing device may be a self-sealing bag or other accommodating devices with a sealing function. By oscillating the sealing device loaded with titanium dioxide and the first organic polymer using a mixer, the mixing uniformity of titanium dioxide and the first organic polymer can be improved. The oscillation time includes but is not limited to 20 min, 30 min, or 40 min, etc., and can be determined according to the actual situation.

[0039] In some embodiments of the present invention, step S10 (mixing titanium dioxide with a powdery first organic polymer to obtain a mixture) may include: mixing titanium dioxide and the first organic polymer according to the following weight ratio relationship to obtain a mixture, where the weight ratio relationship is titanium dioxide : (the first organic polymer + titanium dioxide) = (8 - 10) : 100.

[0040] The content of titanium dioxide in the mixture should not be too much. Controlling the weight ratio relationship between titanium dioxide and the first organic polymer in the mixture within the range of (8 - 10) : 100 can improve the mixing uniformity of the two and provide the accuracy of hardness measurement.

[0041] In some embodiments of the present invention, step S20 (heating the mixture to obtain a mixture in a first state) may include: placing the mixture in a metal container and placing the metal container carrying the mixture in an oven for heating; when the duration for the oven temperature to reach the set temperature meets the preset duration, obtaining a mixture in a first state and taking out the metal container carrying the mixture in the first state from the oven.

[0042] Specifically, the metal container may be a flat-bottomed metal pot to improve the uniform heating of the mixture.

[0043] In some examples, the metal container is a flat-bottomed aluminum pot.

[0044] The flat-bottomed aluminum pot can be circular or square, with its diameter or side length not less than 40 mm. The addition amount of the mixture is based on the thickness of the sample after melting > 6 mm, that is, the sample addition amount is determined by the diameter of the aluminum pot and the thickness of the sample.

[0045] The oven can not only heat the mixture but also keep the mixture warm after heating, simplifying the operation process for measuring the hardness of titanium dioxide products.

[0046] The preset duration can be (20 - 30) min. For example, it can be 20 min, 23 min, 25 min, 28 min, 30 min, etc.

[0047] In some embodiments of the present invention, step S30 (after the mixture in the first state is cooled, based on a Shore hardness tester, obtaining the mixture in the second state and measuring the hardness of the mixture in the second state) may include: after the mixture in the first state is cooled, obtaining the mixture in the second state; selecting a plurality of first measurement points on the surface of the mixture in the second state, and measuring the hardness of the plurality of first measurement points based on a Shore hardness tester; obtaining the hardness of the titanium dioxide product based on the average value of the hardness of the plurality of first measurement points.

[0048] Among them, the first state may be a liquid state, and the second state may be a solid state.

[0049] Specifically, in the embodiments of the present invention, 5 - 8 measurement points can be selected on the surface of the item to be measured, and the hardness values of the item to be measured at the measurement points are respectively measured using a Shore hardness tester, and the average value of the measured multiple hardness values is calculated. The hardness of the titanium dioxide product is characterized by the average value of the hardness of several measurement points, which further improves the accuracy of the hardness measurement of the titanium dioxide product.

[0050] In some embodiments of the present invention, the distance between any two of the plurality of first measurement points is greater than 10 mm.

[0051] Specifically, the distance between the measurement points can be greater than or equal to 10 mm. For example, it can be 11 mm, 12 mm, 13 mm, 14 mm, 15 mm. Thereby, the measurement accuracy is further improved.

[0052] In some embodiments, as Figure 2 shown, a method for measuring the hardness of a titanium dioxide product provided by the embodiments of the present invention includes steps S21 - S25.

[0053] S21: Take 2 - 5 g of titanium dioxide and a certain amount of resin, add them into a self-sealing bag, and seal the self-sealing bag well.

[0054] Among them, the addition amount of the resin is determined according to the following weight ratio relationship and the addition amount of titanium dioxide.

[0055] m 钛白粉 : m 树脂 +m 钛白粉 = (8 - 10) : 100. S22: Place the above self-sealing bag filled with materials into a mixing machine, oscillate and disperse for 30 min, and set aside for use.

[0056] S23. Take 10 g - 15 g of the above-mentioned uniformly mixed materials in a flat-bottomed aluminum pan, place it in an oven and heat it up until the resin melts. After reaching the set temperature, keep it warm for 20 - 30 min.

[0057] S24. After reaching the heat preservation time, take out the melted materials and let them cool.

[0058] S25. Place the cooled materials on a flat tabletop, insert a Shore hardness tester into the sample to be measured, and obtain the hardness value of the sample to be measured.

[0059] The following uses specific examples to illustrate the embodiments of the present invention. It should be understood that the following examples are only used to explain and illustrate the present invention, and are not used to limit the present invention.

[0060] Titanium dioxide 1#, titanium dioxide 2#, and titanium dioxide 3# are titanium dioxides obtained by different coating agents respectively. Titanium dioxide 1# is the titanium dioxide supported by a silicon-aluminum coating agent. Titanium dioxide 2# is the titanium dioxide supported by a zirconium-aluminum coating agent. Titanium dioxide 3# is the titanium dioxide supported by a single-aluminum coating agent.

[0061] Example 1 Step 1. Take 5 g of titanium dioxide 1# and 45 g of LDPE resin, add them into a self-sealing bag, and seal the self-sealing bag well.

[0062] Step 2. Place the above self-sealing bag filled with materials in a mixing machine and oscillate and disperse for 30 min.

[0063] Step 3. Take 2 portions of 10 g of the above-mentioned uniformly mixed materials in a flat-bottomed aluminum pan, place it in an oven and heat it up to 115 °C. After the temperature reaches 115 °C, bake for another 20 min.

[0064] Step 4. Take out the melted materials and wait for cooling for use.

[0065] Step 5. Place the cooled mixed materials on a flat tabletop, select the measurement points, insert a Shore hardness tester into the mixed materials, obtain the hardness values of the mixed materials at each measurement point, and calculate the average hardness value to characterize the hardness of the mixed materials (i.e., titanium dioxide products).

[0066] Example 2 Step 1. Take 5 g of titanium dioxide 2# and 45 g of LDPE resin, add them into a self-sealing bag, and seal the self-sealing bag well.

[0067] Step 2. Place the above self-sealing bag filled with materials in a mixing machine and oscillate and disperse for 30 min.

[0068] Step 3. Take 2 portions of 10 g of the above-mentioned uniformly mixed materials in a flat-bottomed aluminum pan, place it in an oven and heat it up to 115 °C. After the temperature reaches 115 °C, bake for another 20 min.

[0069] Step 4: Take out the melted materials and wait for them to cool for later use.

[0070] Step 5: Place the cooled mixed materials on a flat tabletop, select the measurement points, insert a Shore hardness tester into the mixed materials to obtain the hardness values of the mixed materials at each measurement point, and calculate the average hardness value to characterize the hardness of the mixed materials (i.e., titanium dioxide products).

[0071] The hardness values of 2 portions of titanium dioxide products are shown in Table 1 for details.

[0072] Example 3 Step 1: Take 5 g of titanium dioxide #3 and 45 g of LDPE resin, add them into a self-sealing bag, and seal the self-sealing bag well.

[0073] Step 2: Place the above self-sealing bag filled with materials into a mixer and disperse them by oscillation for 30 min.

[0074] Step 3: Take 2 portions of 10 g of the above well-mixed materials and put them into a flat-bottom aluminum pot, place them in an oven and heat up to 115°C, and then bake for another 20 min after the temperature reaches 115°C.

[0075] Step 4: Take out the melted materials and wait for them to cool for later use.

[0076] Step 5: Place the cooled mixed materials on a flat tabletop, select the measurement points, insert a Shore hardness tester into the mixed materials to obtain the hardness values of the mixed materials at each measurement point, and calculate the average hardness value to characterize the hardness of the mixed materials (i.e., titanium dioxide products).

[0077] The hardness values of 2 portions of titanium dioxide products are shown in Table 1 for details.

[0078] Table 1

[0079] It can be seen from Table 1 that the hardness values of titanium dioxide products can be measured by the method of this embodiment, and the measurement accuracy is improved.

[0080] The technical features of the above embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0081] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A method for measuring the hardness of a titanium dioxide product, characterized in that, Including: Mix titanium dioxide and a first organic polymer evenly, then heat and cool them to obtain a mixture in a second state, and measure the hardness of the mixture in the second state, which is the hardness value of the titanium dioxide product.

2. The method for measuring the hardness of a titanium dioxide product according to claim 1, wherein, Mix titanium dioxide and a first organic polymer evenly, then heat and melt them and cool to obtain a mixture in a second state. Measuring the hardness of the mixture in the second state includes: Mix titanium dioxide and a powdery first organic polymer to obtain a mixture; Heat the mixture to obtain a mixture in a first state; After the mixture in the first state cools, obtain a mixture in a second state, and measure the hardness of the mixture in the second state based on a Shore hardness tester.

3. The method according to claim 2, wherein The step of mixing titanium dioxide and a powdery first organic polymer to obtain a mixture includes: Add the titanium dioxide and the first organic polymer into a sealed device; Based on a mixer, oscillate the sealed device loaded with the titanium dioxide and the first organic polymer to obtain the titanium dioxide and the first organic polymer that are evenly mixed; Take out the evenly mixed titanium dioxide and first organic polymer from the sealed device to obtain a mixture.

4. The method according to claim 2, characterized in that, The step of mixing titanium dioxide and a powdery first organic polymer to obtain a mixture includes: Mix titanium dioxide and a first organic polymer according to the following weight ratio relationship to obtain a mixture, where the weight ratio relationship is titanium dioxide : (first organic polymer + titanium dioxide) = (8 - 10) :

100.

5. The method according to claim 2, wherein The step of heating the mixture to obtain a mixture in a first state includes: Place the mixture in a metal container, and place the metal container carrying the mixture in an oven for heating; When the duration for the oven temperature to reach the set temperature meets the preset duration, obtain a mixture in a first state, and take out the metal container carrying the mixture in the first state from the oven.

6. The method according to claim 5, characterized in that, The first organic polymer includes resin; the first state is liquid, the second state is solid; the preset duration is 20 - 30 min.

7. The method according to claim 5, characterized in that The amount of the mixture added to the metal container is such that after the mixture in the first state melts, the height in the metal container is greater than 6 mm.

8. The method according to claim 5, characterized in that, The cross-sectional length of the metal container in the horizontal direction is not less than 40 mm.

9. The method according to claim 1, characterized in that, Measuring the hardness of the mixture in the second state based on a Shore hardness tester includes: Select several first measurement points on the surface of the mixture in the second state, and measure the hardness of the several first measurement points based on a Shore hardness tester; Based on the average value of the hardness of the several first measurement points, obtain the hardness of the titanium dioxide product.

10. The method according to claim 9, wherein The distance between any two of the several first measurement points is greater than 10 mm.

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