CN111982761B - Method for detecting dispersibility of titanium dioxide in water-based color paste - Google Patents
Method for detecting dispersibility of titanium dioxide in water-based color paste Download PDFInfo
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- CN111982761B CN111982761B CN202010871149.2A CN202010871149A CN111982761B CN 111982761 B CN111982761 B CN 111982761B CN 202010871149 A CN202010871149 A CN 202010871149A CN 111982761 B CN111982761 B CN 111982761B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0053—Investigating dispersion of solids in liquids, e.g. trouble
Abstract
The invention belongs to the field of application of titanium dioxide in water-based paint, and particularly relates to a method for detecting the dispersibility of titanium dioxide in water-based color paste. Aiming at the defects of weak representation, poor accuracy or incapability of quantification in the existing water-based paint dispersibility detection method, the invention provides a method for detecting the dispersibility of titanium dioxide in water-based color paste, which comprises the following steps: a. adopting covering power test paper, and automatically scraping the titanium dioxide aqueous color paste from top to bottom by using a wet film preparation device with the wet film thickness of 120 +/-4 mu m; b. placing the scraped sample plate into a thermostat with the temperature of 50 +/-5 ℃, and drying for 20 +/-1 min; c. and (3) irradiating from the back of the sample plate by using a mobile phone barrel light, counting the black particles in the white scraper plate area, wherein not more than 23 black particles are qualified, and more than 23 black particles are unqualified. The invention can avoid misjudging the shrinkage cavity into coarse particles, has more accurate detection result, also has the basis of direct quantitative comparison among different samples, and has important significance.
Description
Technical Field
The invention belongs to the field of application of titanium dioxide in water-based paint, and particularly relates to a method for detecting the dispersibility of titanium dioxide in water-based color paste.
Background
The dispersibility of titanium dioxide in the paint is a very important index in the application index of the paint, and directly determines the applicability and economic value of the paint.
At present, the method for detecting the dispersibility by using a fineness plate is mostly applied to the coating industry, is limited by the area of a scraping plate, has relatively poor representativeness, is easily influenced by the personal ability of a detector, and causes larger deviation of results. Taking the fineness of the scraper plate of 0-100 μm as an example, the maximum fineness detection deviation of the same sample can reach 15 μm by the same detector. Another method is to judge the dispersibility of the coating by observing whether the surface of a paint film is flat and smooth under natural light or a standard light source. The method is also mainly based on sensory evaluation of detection personnel, shrinkage cavities are easily judged to be coarse particles by mistake, the area of an observation surface is also influenced by sample scraping, and the method is not easy to determine and cannot be quantitatively evaluated at all.
At present, the method for detecting the dispersibility of the titanium dioxide in the aqueous color paste is not strong in representation or lacks of quantitative determination standards, and a method which has strong representation and quantitative determination of the dispersibility of the titanium dioxide in the aqueous color paste does not exist.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing water-based paint dispersibility detection method has the defects of weak representation, poor accuracy and incapability of quantification.
The technical scheme for solving the technical problems comprises the following steps: provides a method for detecting the dispersibility of titanium dioxide in aqueous color paste. The method comprises the following steps:
a. adopting covering power test paper, placing the prepared titanium dioxide water-based color paste on the top end of the test paper, wherein the width of the test paper is the same as that of a sample scraping groove of a wet film preparation device, and automatically scraping a plate from top to bottom by using the wet film preparation device with the wet film thickness of 120 +/-4 mu m;
b. b, putting the sample plate scraped in the step a into a thermostat with the temperature of 50 +/-5 ℃, and drying for 20 +/-1 min;
c. and (3) irradiating from the back of the sample plate by using a mobile phone barrel light, counting the black particles in the white scraper plate area from the boundary line of the black and white grids of the covering power test paper, wherein not more than 23 black particles are qualified, and more than 23 black particles are unqualified.
In the method for detecting the dispersibility of the titanium dioxide in the aqueous color paste, the concentration of the aqueous color paste obtained in the step a is 58 +/-2%.
In the method for detecting the dispersibility of the titanium dioxide in the water-based color paste, the covering power test paper in the step a is spliced test paper with black and white in equal proportion.
In the method for detecting the dispersibility of the titanium dioxide in the aqueous color paste, the step a refers to a region from a black region to a white region of the test paper from top to bottom.
In the method for detecting the dispersibility of the titanium dioxide in the water-based color paste, the covering power test paper in the step a is a varnish coating, and the size is 260mm in length and 194mm in width.
In the method for detecting the dispersibility of the titanium dioxide in the aqueous color paste, the covering power test paper obtained in the step a is a product of PA-2813 product number purchased from BYK company.
The invention has the beneficial effects that:
the invention provides a method for detecting the dispersibility of titanium dioxide in aqueous color paste, which is characterized in that black-white spliced covering power test paper is adopted for sample scraping, and a flashlight light source of a mobile phone is adopted for irradiating the back of the test paper, so that shrinkage cavities can be prevented from being judged into coarse particles by mistake, and the detection result is more accurate. The scraped area of the invention can be quickly defined, and the judgment standard that less than or equal to 23 black particles are qualified and more than 23 black particles are unqualified is determined for a specific area, so that different samples have the basis of direct quantitative comparison, and the measured dispersibility of the titanium dioxide in the aqueous color paste is more accurate. The method disclosed by the invention is simple to operate, strong in representation and convenient to popularize and utilize well.
Drawings
FIG. 1 shows the visual inspection of the flashlight of the mobile phone in the case of the embodiment 1;
FIG. 2 shows the comparative example 2 water-based color paste dispersibility detection calibration result;
fig. 3 shows the visual observation of comparative example 3 under a natural light source.
Detailed Description
The invention provides a method for detecting the dispersibility of titanium dioxide in aqueous color paste, which comprises the following steps:
a. adopting covering power test paper, placing the prepared titanium dioxide water-based color paste on the top end of the test paper, wherein the width of the test paper is the same as that of a sample scraping groove of a wet film preparation device, and automatically scraping a plate from top to bottom by using the wet film preparation device with the wet film thickness of 120 +/-4 mu m;
b. b, putting the sample plate scraped in the step a into a thermostat with the temperature of 50 +/-5 ℃, and drying for 20 +/-1 min;
c. and (3) irradiating from the back of the sample plate by using a mobile phone barrel light, counting the black particles in the white scraper plate area from the boundary line of the black and white grids of the covering power test paper, wherein not more than 23 black particles are qualified, and more than 23 black particles are unqualified.
In the existing method for detecting the dispersibility of titanium dioxide in the aqueous color paste, white coated paper is generally adopted for scraper sampling, then a flashlight light source or a natural light source is used for irradiating the front side of the scraper, and the quantity of black particles in the sample scraper is visually observed, so that whether the dispersibility of the titanium dioxide in the aqueous color paste is qualified or not is judged.
In the existing art paper sample scraping visual inspection method, because the initial point of the scraper is not fixed, the sample membrane area is not easy to quantify, and the quantification standard can not be formed.
The invention particularly adopts the test paper spliced in equal proportion of black and white to scrape the sample, the sample is scraped from the black area to the white area during scraping, the number of black particles in the white scraper area can be rapidly counted by using a standard black and white boundary line as the starting line of the detection area, the detection area is determined, and the detection result can be quantitatively compared and is more accurate.
Meanwhile, the black particles are directly irradiated on the front surface of the sample by adopting a standard light source or a natural light source to visually observe the black particles, so that the shrinkage cavity or the bubbles are easily judged to be coarse particles by mistake. The inventor finds out through a large number of experimental observations that if the back of the sample is irradiated and a white light source with certain focusing and penetrating functions such as a flashlight of a mobile phone is adopted for irradiation, the influence of shrinkage cavity or bubbles can be better avoided. This is a summary of the inventors' long-term experience and has not been suggested in the prior art.
The judgment standard of the invention is that 23 black particles are qualified and more than 23 black particles are unqualified, which is obtained by the experience of long-term test of the inventor, the quantity of the black particles is also influenced by the scraped area and the wet film thickness, and the quantity of the particles only represents a white detection area with the wet film thickness of 120 mu m +/-4 mu m and the width of 80mm on PA-2813 hiding power test paper produced by BYK company. When the specification of the test paper is changed, the judgment standard of the qualified sample can be converted by the technical personnel in the field according to the actual situation. The standard of the number of qualified particles can be influenced by the concentration of the aqueous color paste, and the concentration of the aqueous color paste corresponding to that less than or equal to 23 black particles are qualified and more than 23 black particles are unqualified is 58 +/-2 percent. When the concentration is changed, the evaluation standard can be drawn up again according to the actual situation.
The method for detecting the dispersibility of the titanium dioxide in the aqueous color paste has the advantages that the method for detecting the dispersibility of the titanium dioxide in the aqueous color paste is possible under the condition that the dispersibility of the titanium dioxide in the aqueous color paste is closer to practical application for the first time, the method is more accurate after the film coating quantization treatment of the covering power test paper compared with the traditional method for detecting the fineness plate and qualitatively and visually observing the white art paper, the applicability is stronger, the influence of the subjective ability of a detector is not easy to influence, the influence of the quality fluctuation of a sample is relatively reduced, and the method has important practical significance.
The following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.
Example 1 measurement of dispersibility of titanium dioxide in aqueous color paste by the method of the present invention
The specific operation steps are as follows:
a. placing covering power test paper on a sucker of an automatic film coating instrument, taking a proper amount of water-based color paste on the top end of the test paper, wherein the width of the water-based color paste is the same as that of a sample scraping groove of a wet film preparation device, and automatically scraping a plate from a black sample plate to a white sample plate by using the wet film preparation device with the wet film thickness of 120 mu m;
b. flatly placing the scraped sample plate into a thermostat at 50 ℃ and drying for 20 minutes;
c. and (3) irradiating from the back of the sample plate by using a mobile phone barrel light, counting the black particles in the white scraper plate area from the boundary line of the black and white grids of the covering power test paper, wherein not more than 23 black particles are qualified, and more than 23 black particles are unqualified.
Example 1 the template observed is shown in figure 1. As can be seen from FIG. 1, the test area can be rapidly distinguished through the boundary line of black and white background, and through the transmission of the light source of the mobile phone, the transparent part is the shrinkage cavity, and the black spot which can not be transparent is the coarse particle. The detection area is more representative than the fineness plate width (white detection area: 115 mm. times.80 mm).
Comparative example 2 measurement by the fineness Board reading method
The method is carried out according to GB 1724, a proper amount of water-based color paste is taken to be arranged in a groove of a board with the fineness of 0-100 mu m, and visual reading is carried out within 5 seconds after the board is scraped. And at the positions where the grains in the reading groove are uniformly exposed, the number of coarse grains adjacent to the smallest scale cannot exceed 3.
As a result, as shown in FIG. 2, the fineness plate detection data fluctuates largely. And the scraper area is relatively small (groove area 12.5 x 140 mm).
Comparative example 3 measurement by the conventional doctor blade method
Placing white art paper on a sucking disc of an automatic film coating instrument, taking a proper amount of water-based color paste on the upper end of the test paper, and automatically scraping a plate from top to bottom by using a wet film preparation device with the wet film thickness of 100 mu m. After natural drying or drying at the constant temperature of 50 ℃ for 20 minutes, the surface of the paint film is visually inspected whether to be flat or smooth under a natural light source or a standard light source.
The results are shown in FIG. 3. It can be seen that the method is difficult to quantify quickly and cannot distinguish between smaller shrinkage cavities and coarse particles.
Claims (6)
1. The method for detecting the dispersibility of the titanium dioxide in the water-based color paste is characterized by comprising the following steps of:
a. adopting covering power test paper, placing the prepared titanium dioxide water-based color paste on the top end of the test paper, wherein the width of the test paper is the same as that of a sample scraping groove of a wet film preparation device, and automatically scraping a plate from top to bottom by using the wet film preparation device with the wet film thickness of 120 +/-4 mu m;
b. b, putting the sample plate scraped in the step a into a thermostat with the temperature of 50 +/-5 ℃, and drying for 20 +/-1 min;
c. and (3) irradiating from the back of the sample plate by using a mobile phone barrel light, counting the black particles in the white scraper plate area from the boundary line of the black and white grids of the covering power test paper, wherein not more than 23 black particles are qualified, and more than 23 black particles are unqualified.
2. The method for detecting the dispersibility of the titanium dioxide in the aqueous color paste according to claim 1, wherein the method comprises the following steps: the concentration of the water-based color paste in the step a is 58 +/-2%.
3. The method for detecting the dispersibility of the titanium dioxide in the aqueous color paste according to claim 1 or 2, which is characterized in that: and a step a, splicing the covering power test paper in black and white in equal proportion.
4. The method for detecting the dispersibility of the titanium dioxide in the aqueous color paste according to any one of claims 1 to 3, wherein the method comprises the following steps: the step a refers to a region from a black area to a white area of the test paper from top to bottom.
5. The method for detecting the dispersibility of the titanium dioxide in the aqueous color paste according to any one of claims 1 to 4, wherein the method comprises the following steps: step a, the hiding power test paper is a varnish coating and has the size of 260mm in length and 194mm in width.
6. The method for detecting the dispersibility of the titanium dioxide in the aqueous color paste according to any one of claims 1 to 5, wherein the method comprises the following steps: step a the hiding power test paper is a product purchased from BYK company under the product number PA-2813.
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