CN113933128A - Method for detecting whiteness of titanium dioxide in paint - Google Patents
Method for detecting whiteness of titanium dioxide in paint Download PDFInfo
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- CN113933128A CN113933128A CN202111419085.3A CN202111419085A CN113933128A CN 113933128 A CN113933128 A CN 113933128A CN 202111419085 A CN202111419085 A CN 202111419085A CN 113933128 A CN113933128 A CN 113933128A
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- titanium dioxide
- paint
- whiteness
- water
- detecting
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 239000003973 paint Substances 0.000 title claims abstract description 102
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229920002678 cellulose Polymers 0.000 claims abstract description 27
- 239000001913 cellulose Substances 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 19
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000007790 scraping Methods 0.000 claims description 20
- 239000006185 dispersion Substances 0.000 claims description 19
- 239000002518 antifoaming agent Substances 0.000 claims description 17
- 239000000839 emulsion Substances 0.000 claims description 12
- 239000002270 dispersing agent Substances 0.000 claims description 10
- 239000000080 wetting agent Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 7
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 6
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 6
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 6
- 239000013530 defoamer Substances 0.000 claims description 4
- 229920003063 hydroxymethyl cellulose Polymers 0.000 claims description 3
- 229940031574 hydroxymethyl cellulose Drugs 0.000 claims description 3
- 235000010215 titanium dioxide Nutrition 0.000 description 36
- 239000000203 mixture Substances 0.000 description 6
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 239000012463 white pigment Substances 0.000 description 2
- 241000227425 Pieris rapae crucivora Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical group [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; viscous liquids; paints; inks
- G01N33/32—Paints; inks
Abstract
The invention relates to the field of titanium dioxide application performance detection methods, in particular to a method for efficiently and accurately detecting the whiteness of titanium dioxide in a paint, which represents the whiteness of the titanium dioxide in the paint, and comprises the following steps: a. uniformly dispersing cellulose, an auxiliary agent and water, adjusting the pH value to 8.5-9.5 and mixing to obtain cellulose pulp; b. adding titanium dioxide into the cellulose pulp and uniformly dispersing the titanium dioxide to prepare water-based paint color paste; c. adding an auxiliary agent for preparing paint into the water-based paint color paste to prepare water-based paint color paint; d. and (3) coating the water-based paint colored paint on a cement board to prepare a sample plate, drying, and measuring the whiteness of the sample plate to obtain a whiteness detection result. The invention has the advantages of high efficiency and accuracy by optimizing the application detection method of the existing titanium dioxide in the styrene-acrylic exterior wall coating and accurately analyzing the whiteness application performance of the titanium dioxide in the exterior wall coating, and the method is simple and convenient to operate and has good application prospect. The method is particularly suitable for detecting the whiteness of the titanium dioxide in the paint.
Description
Technical Field
The invention relates to the field of titanium dioxide application performance detection methods, in particular to a method for detecting whiteness of titanium dioxide in a coating.
Background
Titanium white powder is considered as a white pigment with the best performance in the world at present, and is widely applied to the industries of coatings, plastics, printing ink, paper making and the like. Titanium dioxide (titanium dioxide) has stable chemical properties and does not react with most materials under general conditions. The coating industry is the largest user of titanium dioxide, the titanium dioxide is the most common white pigment in exterior wall coatings, and the titanium dioxide has good photochemical activity, high covering power and strong tinting strength, can play a role in protecting the stability of a medium, can enhance the mechanical strength and adhesive force of a paint film, and prolongs the service life of the paint film. The whiteness of the titanium dioxide in the paint is an important application performance index, and at present, various white fillers or additives are added to the whiteness detection method of the titanium dioxide in the styrene-acrylic exterior wall paint, so that the whiteness application performance of the titanium dioxide in the paint cannot be really represented.
Disclosure of Invention
The invention aims to provide a method for efficiently and accurately detecting the whiteness of titanium dioxide in paint, which represents the whiteness of the titanium dioxide in the paint.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for detecting the whiteness of the titanium dioxide in the paint comprises the following steps: a. uniformly dispersing cellulose, an auxiliary agent and water, adjusting the pH value to 8.5-9.5 and mixing to obtain cellulose pulp; b. adding titanium dioxide into the cellulose pulp and uniformly dispersing the titanium dioxide to prepare water-based paint color paste; c. adding an auxiliary agent for preparing paint into the water-based paint color paste to prepare water-based paint color paint; d. and (3) coating the water-based paint colored paint on a cement board to prepare a sample plate, drying, and measuring the whiteness of the sample plate to obtain a whiteness detection result.
Further, in step a, the cellulose is hydroxymethyl cellulose or hydroxyethyl cellulose.
Further, in the step a, the auxiliary agents are an antifoaming agent, a dispersing agent and a wetting agent.
Further, in the step a, the weight ratio of the cellulose to the defoaming agent to the dispersing agent to the wetting agent to the water is 0.5-3:1-1.5:2-3.5:0.7-2: 80-120.
Further, in the step a, the rotation speed of the uniformly dispersed stirring equipment is 200-900r/min, and the dispersion time is 15-90 min.
Further, in the step b, the weight ratio of the cellulose pulp to the titanium dioxide is 100-150: 100-120.
Further, in the step b, the rotating speed of the uniformly dispersed stirring equipment is 2000-2800 r/min, the dispersing time is 15-90 min, wherein the qualified standard of the dispersibility is less than or equal to 50 μm, and if the dispersibility is not qualified, the dispersing time needs to be increased.
Further, in the step c, the auxiliary agents are a defoaming agent, a film forming auxiliary agent and an external wall emulsion.
Further comprising styrene-acrylic emulsion, wherein the weight ratio of the defoaming agent to the film-forming assistant to the styrene-acrylic emulsion is 0.5-2: 5-15: 100-150.
And further, in the step d, coating the water-based paint color paint on a cement plate by using a wire rod to prepare a sample plate, wherein the wire rod is used for scraping the sample for the first time to be 120 microns thick and the wire rod for scraping the sample for the second time to be 80 microns thick respectively, the sample plate is placed for 6 hours after the sample is scraped for the first time and then is scraped for the second time, and the cement plate is soaked in water for one week before being used and is polished to be flat for use.
The invention has the beneficial effects that: the invention has the advantages of high efficiency and accuracy by optimizing the application detection method of the existing titanium dioxide in the styrene-acrylic exterior wall coating and accurately analyzing the whiteness application performance of the titanium dioxide in the exterior wall coating, and the method is simple and convenient to operate and has good application prospect. The method is particularly suitable for detecting the whiteness of the titanium dioxide in the paint.
Detailed Description
The method for detecting the whiteness of the titanium dioxide in the paint comprises the following steps: a. uniformly dispersing cellulose, an auxiliary agent and water, adjusting the pH value to 8.5-9.5 and mixing to obtain cellulose pulp; b. adding titanium dioxide into the cellulose pulp and uniformly dispersing the titanium dioxide to prepare water-based paint color paste; c. adding an auxiliary agent for preparing paint into the water-based paint color paste to prepare water-based paint color paint; d. and (3) coating the water-based paint colored paint on a cement board to prepare a sample plate, drying, and measuring the whiteness of the sample plate to obtain a whiteness detection result. The relevant experimental equipment is as follows: laboratory dispersion machine, electronic balance (accuracy 0.01), line bar, desk-top spectrophotometer.
In practical operation, for example, to obtain a better detection effect, it is preferable that in step a, the cellulose is hydroxymethyl cellulose or hydroxyethyl cellulose; the preferable auxiliary agents are a defoaming agent, a dispersing agent and a wetting agent; wherein it is further preferred that the defoamer is a polyetherester defoamer; the dispersing agent is sodium polyacrylate; the wetting agent is a nonionic surfactant. Wherein the weight ratio of the cellulose to the defoamer to the dispersant to the wetting agent to the water is preferably 0.5-3:1-1.5:2-3.5:0.7-2: 80-120; preferably, the rotation speed of the dispersion is 200-900r/min, and the dispersion time is 15-90 min.
Similarly, in order to realize a better detection effect, in the step b, the weight ratio of the cellulose pulp to the titanium dioxide is preferably 100-150: 100-120; the rotating speed of the dispersion is 2000-2800 r/min, the dispersion time is 15-90 min, the qualified standard of the dispersion is less than or equal to 50 mu m, and if the dispersion is not qualified, the dispersion time can be increased.
In the preferable step c, the auxiliary agents are defoaming agents, film-forming auxiliary agents and exterior wall emulsions. The defoaming agent, the film-forming assistant and the styrene-acrylic emulsion are preferably contained, and the weight ratio of the defoaming agent to the film-forming assistant to the styrene-acrylic emulsion is 0.5-2: 5-15: 100-150. Preferably, in the step d, a wire rod is adopted to coat the water-based paint color paint on a cement plate to prepare a sample plate, wherein the wire rod is used for scraping the sample for the first time to be 120 microns thick and the wire rod for scraping the sample for the second time to be 80 microns thick respectively, the sample plate is placed for 6 hours after the sample is scraped for the first time and then is scraped for the second time, and the cement plate is soaked in water for one week before use and then is polished to be flat for use.
Examples
Example 1
a. Preparing cellulose pulp: adding 2.1g of hydroxyethyl cellulose and 1.0g of defoaming agent into 130g of tap water, placing the mixture in a multifunctional dispersion machine in a laboratory, and dispersing for 5min at the rotating speed of 200-300 r/min; and then adjusting the pH to 8.5-9.5 by using Dow AMP-95, adding 3.0g of dispersing agent and 1.5g of wetting agent, and adjusting the rotating speed to 900r/min for dispersing for 15 min.
b. Preparing water-based paint color paste: 138g of prepared cellulose pulp is weighed, 100g of titanium dioxide product A is added, the mixture is placed in a multifunctional dispersion machine in a laboratory for dispersion for 20min at the speed of 2500r/min, and whether the dispersibility of the water-based paint color paste is qualified (namely less than or equal to 50 mu m) is detected.
c. Preparing water-based paint colored paint: when the dispersibility of the water-based paint color paste is qualified, adding 1.0g of defoaming agent, slowly adding 10.5g of film-forming assistant and 100.0g of styrene-acrylic emulsion, and adjusting the rotating speed to 800r/min for dispersing for 20 min.
d. Scraping the sample on a cement board which is soaked for a week in advance with water and polished to be flat: and uniformly stirring the colored paint, pressing the colored paint on a cement board by using a 120 mu m wire rod, scraping the colored paint downwards at a constant speed, horizontally placing the colored paint, placing the colored paint in the air for 6 hours, and scraping the colored paint for the second time. The second sample scraping method is consistent with the first sample scraping method, the wire rod is 80 microns, the paint film is uniformly distributed, no transverse line scratches exist, and after the paint film of the cement board is dried, the whiteness of the paint film is detected.
Example 2
a. Preparing cellulose pulp: adding 2.1g of hydroxyethyl cellulose and 1.0g of defoaming agent into 130g of tap water, placing the mixture in a multifunctional dispersion machine in a laboratory, and dispersing for 5min at the rotating speed of 200-300 r/min; and then adjusting the pH to 8.5-9.5 by using Dow AMP-95, adding 3.0g of dispersing agent and 1.5g of wetting agent, and adjusting the rotating speed to 900r/min for dispersing for 15 min.
b. Preparing water-based paint color paste: 138g of prepared cellulose pulp is weighed, 100g of titanium dioxide product B is added, the mixture is placed in a multifunctional dispersion machine in a laboratory for dispersion for 20min at the speed of 2500r/min, and whether the dispersibility of the water-based paint color paste is qualified (namely less than or equal to 50 mu m) is detected.
c. Preparing water-based paint colored paint: when the dispersibility of the water-based paint color paste is qualified, adding 1.0g of defoaming agent, slowly adding 10.5g of film-forming assistant and 100.0g of styrene-acrylic emulsion, and adjusting the rotating speed to 800r/min for dispersing for 20 min.
d. Scraping the sample on a cement board which is soaked for a week in advance with water and polished to be flat: and uniformly stirring the colored paint, pressing the colored paint on a cement board by using a 120 mu m wire rod, scraping the colored paint downwards at a constant speed, horizontally placing the colored paint, placing the colored paint in the air for 6 hours, and scraping the colored paint for the second time. The second sample scraping method is consistent with the first sample scraping method, the wire rod is 80 microns, the paint film is uniformly distributed, no transverse line scratches exist, and after the paint film of the cement board is dried, the whiteness of the paint film is detected.
Example 3
a. Preparing cellulose pulp: adding 2.1g of hydroxyethyl cellulose and 1.0g of defoaming agent into 130g of tap water, placing the mixture in a multifunctional dispersion machine in a laboratory, and dispersing for 5min at the rotating speed of 200-300 r/min; and then adjusting the pH to 8.5-9.5 by using Dow AMP-95, adding 3.0g of dispersing agent and 1.5g of wetting agent, and adjusting the rotating speed to 900r/min for dispersing for 15 min.
b. Preparing water-based paint color paste: 138g of prepared cellulose pulp is weighed, 100g of titanium dioxide product C is added, the mixture is placed in a multifunctional dispersion machine in a laboratory for dispersion for 20min at the speed of 2500r/min, and whether the dispersibility of the water-based paint color paste is qualified (namely less than or equal to 50 mu m) is detected.
c. Preparing water-based paint colored paint: when the dispersibility of the water-based paint color paste is qualified, adding 1.0g of defoaming agent, slowly adding 10.5g of film-forming assistant and 100.0g of styrene-acrylic emulsion, and adjusting the rotating speed to 800r/min for dispersing for 20 min.
d. Scraping the sample on a cement board which is soaked for a week in advance with water and polished to be flat: and uniformly stirring the colored paint, pressing the colored paint on a cement board by using a 120 mu m wire rod, scraping the colored paint downwards at a constant speed, horizontally placing the colored paint, placing the colored paint in the air for 6 hours, and scraping the colored paint for the second time. The second sample scraping method is consistent with the first sample scraping method, the wire rod is 80 microns, the paint film is uniformly distributed, no transverse line scratches exist, and after the paint film of the cement board is dried, the whiteness of the paint film is detected.
The results of the tests performed under the same conditions in examples 1-3 are shown in Table 1.
TABLE 1 test results of A, B, C samples of titanium dioxide product
| Sample name | CIE L | CIE a | CIE b | CIE whiteness | Hunter whiteness |
| Titanium dioxide product A | 96.16 | -0.59 | 1.04 | 85.72 | 92.03 |
| Titanium dioxide product B | 96.69 | -0.59 | 0.69 | 88.57 | 93.71 |
| Titanium dioxide product C | 97.25 | -0.71 | 1.23 | 87.60 | 92.87 |
As can be seen from the analysis of the table 1, the method can detect that the whiteness value of the titanium dioxide product B in the water-based paint external wall system is the best, and then the titanium dioxide product C and the titanium dioxide product A are detected, the conclusion is consistent with the characteristic description of the known titanium dioxide product A, B, C, and the method can more intuitively and quickly ensure the accuracy of the measurement result.
Claims (10)
1. The method for detecting the whiteness of the titanium dioxide in the paint is characterized by comprising the following steps of:
a. uniformly dispersing cellulose, an auxiliary agent and water, adjusting the pH value to 8.5-9.5 and mixing to obtain cellulose pulp;
b. adding titanium dioxide into the cellulose pulp and uniformly dispersing the titanium dioxide to prepare water-based paint color paste;
c. adding an auxiliary agent for preparing paint into the water-based paint color paste to prepare water-based paint color paint;
d. and (3) coating the water-based paint colored paint on a cement board to prepare a sample plate, drying, and measuring the whiteness of the sample plate to obtain a whiteness detection result.
2. The method for detecting the whiteness of the titanium dioxide in the paint according to claim 1, which is characterized in that: in step a, the cellulose is hydroxymethyl cellulose or hydroxyethyl cellulose.
3. The method for detecting the whiteness of the titanium dioxide in the paint according to the claim 1 or 2, which is characterized in that: in the step a, the auxiliary agent is a defoaming agent, a dispersing agent and a wetting agent.
4. The method for detecting the whiteness of the titanium dioxide in the paint according to claim 3, which is characterized in that: in the step a, the weight ratio of the cellulose to the defoamer to the dispersant to the wetting agent to the water is 0.5-3:1-1.5:2-3.5:0.7-2: 80-120.
5. The method for detecting the whiteness of the titanium dioxide in the paint according to claim 3, which is characterized in that: in the step a, the rotation speed of the uniformly dispersed stirring equipment is 200-900r/min, and the dispersion time is 15-90 min.
6. The method for detecting the whiteness of the titanium dioxide in the paint according to the claim 1 or 2, which is characterized in that: in the step b, the weight ratio of the cellulose pulp to the titanium dioxide is 100-150: 100-120.
7. The method for detecting the whiteness of the titanium dioxide in the paint according to the claim 1 or 2, which is characterized in that: in the step b, the rotating speed of the uniformly dispersed stirring equipment is 2000-2800 r/min, the dispersing time is 15-90 min, the qualified standard of the dispersibility is less than or equal to 50 microns, and if the dispersibility is not qualified, the dispersing time needs to be increased.
8. The method for detecting the whiteness of the titanium dioxide in the paint according to the claim 1 or 2, which is characterized in that: in the step c, the auxiliary agents are defoaming agents, film-forming auxiliary agents and exterior wall emulsion.
9. The method for detecting the whiteness of the titanium dioxide in the paint according to claim 8, which is characterized in that: the coating comprises a styrene-acrylic emulsion, wherein the weight ratio of the defoaming agent to the film-forming assistant to the styrene-acrylic emulsion is 0.5-2: 5-15: 100-150.
10. The method for detecting the whiteness of the titanium dioxide in the paint according to the claim 1 or 2, which is characterized in that: and d, coating the water-based paint color paint on a cement board by using a wire rod to prepare a sample plate, wherein the wire rod is used for scraping the sample for the first time to be 120 microns thick and the sample for the second time to be 80 microns thick respectively, the sample plate is placed for 6 hours after the sample is scraped for the first time and then is scraped for the second time, and the cement board is soaked in water for one week before use and is polished to be flat for use.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114716873A (en) * | 2022-05-10 | 2022-07-08 | 烟台金桥优尼科新材料科技有限公司 | Carrier solution of titanium dioxide and rapid evaluation method for dispersibility of titanium dioxide |
| CN115931745A (en) * | 2022-09-30 | 2023-04-07 | 攀钢集团重庆钒钛科技有限公司 | Detection method for titanium dioxide floating color and blooming |
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| CN114716873A (en) * | 2022-05-10 | 2022-07-08 | 烟台金桥优尼科新材料科技有限公司 | Carrier solution of titanium dioxide and rapid evaluation method for dispersibility of titanium dioxide |
| CN115931745A (en) * | 2022-09-30 | 2023-04-07 | 攀钢集团重庆钒钛科技有限公司 | Detection method for titanium dioxide floating color and blooming |
| CN115931745B (en) * | 2022-09-30 | 2024-03-19 | 攀钢集团重庆钒钛科技有限公司 | Method for detecting flooding and bloom of titanium dioxide |
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