CN113390912A - Method for evaluating cross-linking curing degree of surface coating of galvanized sheet with Si-containing fingerprint-resistant coating - Google Patents
Method for evaluating cross-linking curing degree of surface coating of galvanized sheet with Si-containing fingerprint-resistant coating Download PDFInfo
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- CN113390912A CN113390912A CN202110586617.6A CN202110586617A CN113390912A CN 113390912 A CN113390912 A CN 113390912A CN 202110586617 A CN202110586617 A CN 202110586617A CN 113390912 A CN113390912 A CN 113390912A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 133
- 238000000576 coating method Methods 0.000 title claims abstract description 133
- 238000004132 cross linking Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 36
- 238000012360 testing method Methods 0.000 claims abstract description 34
- 229920000742 Cotton Polymers 0.000 claims abstract description 16
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 238000004876 x-ray fluorescence Methods 0.000 claims description 14
- 238000011156 evaluation Methods 0.000 abstract description 9
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005238 degreasing Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000004383 yellowing Methods 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 229920000587 hyperbranched polymer Polymers 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000011254 layer-forming composition Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/223—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material by irradiating the sample with X-rays or gamma-rays and by measuring X-ray fluorescence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/07—Investigating materials by wave or particle radiation secondary emission
- G01N2223/076—X-ray fluorescence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/101—Different kinds of radiation or particles electromagnetic radiation
- G01N2223/1016—X-ray
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention discloses an evaluation method of the cross-linking curing degree of a surface coating of a Si-containing fingerprint-resistant coating galvanized plate, which comprises the following steps: 1) after the first wiping treatment of the to-be-detected Si-containing fingerprint-resistant coating galvanized plate by absorbent cotton, selecting a test area for carrying out the first Si content measurement, and calculating the initial Si content m1(ii) a 2) After the to-be-tested Si-containing fingerprint-resistant coating galvanized sheet is subjected to second wiping treatment by using absorbent cotton containing 2-butanone solution, the second Si content measurement is carried out in the same test area, and the current Si content m is measured2(ii) a 3) According to the initial Si content m1And the current Si content m2And (3) calculating the attenuation rate a of the coating, and comparing the attenuation rate a of the coating with a set standard value b to evaluate the crosslinking and curing degree of the coating on the surface of the Si-containing fingerprint-resistant coating galvanized plate. The evaluation method directly quantifies the crosslinking and curing degree of the coating, directly establishes the relation between the detection data and the crosslinking and curing degree of the surface coating, and is easy to use on site for rapid evaluation.
Description
Technical Field
The invention relates to the technical field of detection and evaluation of the cross-linking curing degree of a coating, in particular to an evaluation method of the cross-linking curing degree of a coating on the surface of a galvanized plate with a Si-containing fingerprint-resistant coating.
Background
The fingerprint-resistant coating galvanized plate (electrogalvanized or hot-galvanized plate) is a high value-added product obtained by coating a fingerprint-resistant coating on the surface of the galvanized plate and drying and curing the coating at high temperature, has excellent corrosion resistance, acid and alkali resistance, high temperature resistance, damp and heat resistance, and excellent lubricity and coating performance, and is widely applied to the manufacturing fields of high-end household appliances, movies, office supplies, automobiles, buildings and the like.
The prior fingerprint-resistant coating mainly comprises Si-containing modified resin and SiO2The high-temperature cross-linked zinc-coated plate comprises particles and other functional additives, after being fully baked and cured at high temperature, a Si-O-Zn and Si-O-Si highly cross-linked three-dimensional network structure is formed on the surface of the zinc-coated plate, and the highly cross-linked network structure provides a series of excellent performances of acid resistance, alkali resistance, corrosion resistance, high temperature resistance, humidity resistance and the like which meet the processing requirements of clients.
The excellent surface performance of the fingerprint-resistant coating galvanized sheet is mainly provided by the surface coating, and the precondition is that the surface fingerprint-resistant coating is fully baked and cured, and the surface coating is completely crosslinked and cured. If the surface coating of the fingerprint-resistant coating galvanized sheet is not completely and fully crosslinked and cured, the surface corrosion resistance, acid and alkali resistance, high temperature resistance, damp and heat resistance, lubricity and coating performance of the fingerprint-resistant coating galvanized sheet are greatly influenced, and various defects after processing, such as rusting after cleaning, surface white spot defect after degreasing, surface yellowing after high-temperature baking, stamping cracking, poor coating and the like, are generated at a client, and client quality complaints are generated in a serious case. Especially in winter, the coating is limited by aging characteristics of the coating and insufficient baking capability of steel plant units, and various quality objections caused by poor baking and curing of the coating are high.
How to quickly and effectively evaluate the cross-linking curing degree of the surface coating of the Si-containing fingerprint-resistant coating galvanized sheet is beneficial to quick release delivery of a steel mill coating product, the defect compensation of the product at a client caused by poor curing is reduced, and the profitability of the steel mill is improved. However, no evaluation method for the degree of crosslinking and curing of the surface coating has been known.
In the prior art, chinese patent publication No. CN 104507990 a discloses a silicon-containing hyperbranched polymer and a curable composition containing the same, and the invention provides a hard coat layer-forming composition, which is a cured film obtained by polymerizing a monomer a and a monomer B in the presence of a polymerization initiator D, and a hard coat layer obtained using the same, but the degree of crosslinking and curing of the coating layer cannot be judged. Chinese patent publication No. CN 110873702 a discloses a method for evaluating fingerprint resistance, a method for producing an optical member, and provides a method for quantitatively evaluating fingerprint resistance with high reproducibility, a method for producing an optical member using the evaluation method, and an optical member having excellent fingerprint resistance. Therefore, it is necessary to provide a method for evaluating the cross-linking curing degree of the surface coating of the galvanized sheet with the Si-containing fingerprint-resistant coating.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides an evaluation method of the cross-linking curing degree of the surface coating of the galvanized sheet with the Si-containing fingerprint-resistant coating.
In order to achieve the aim, the invention provides a method for evaluating the cross-linking curing degree of a surface coating of a galvanized sheet with a Si-containing fingerprint-resistant coating, which comprises the following steps:
1) after the first wiping treatment of the to-be-detected Si-containing fingerprint-resistant coating galvanized plate by absorbent cotton, selecting a test area for carrying out the first Si content measurement, and calculating the initial Si content m1；
2) Wiping the to-be-detected Si-containing fingerprint-resistant coating galvanized plate with absorbent cotton containing 2-butanone solution for the second timeAfter treatment, a second Si content measurement is carried out in the same test area selected in the step 1), and the current Si content m is calculated2；
3) According to the initial Si content m1And the current Si content m2And (3) calculating the attenuation rate a of the coating, and comparing the attenuation rate a of the coating with a set standard value b to evaluate the crosslinking and curing degree of the coating on the surface of the Si-containing fingerprint-resistant coating galvanized plate.
Further, in the step 1), the to-be-detected galvanized plate with the Si-containing fingerprint-resistant coating is horizontally placed.
Further, in the step 1), a portable X-ray fluorescence spectrometer is adopted to carry out first Si content measurement on a test area selected by the to-be-tested Si-containing fingerprint-resistant coating galvanized plate.
Further, in the step 2), the absorbent cotton is completely soaked by the 2-butanone solution, and the absorbent cotton is kept wet in the wiping process.
Further, in the step 2), the absorbent cotton containing the 2-butanone solution and the test area of the Si-containing fingerprint-resistant coating galvanized plate form an angle of 30-60 degrees, and 500-800N of force is applied to wipe the plate at a wiping speed of 1-2 reciprocating back and forth per second.
Further, in the step 2), a fixed area with the length being more than or equal to 60mm is selected in the test area of the Si-containing fingerprint-resistant coating galvanized plate to be wiped for 10-15 reciprocating times.
Further, in the step 2), a portable X-ray fluorescence spectrometer is adopted to carry out second Si content measurement on a test area selected by the to-be-tested Si-containing fingerprint-resistant coating galvanized plate.
Further, in the step 3), the coating attenuation rate a is calculated as follows:
in the formula, m1Is the initial Si content, m2Is the current Si content.
Further, in the step 3), if the attenuation rate a of the coating is less than or equal to the standard value b, judging that the cross-linking curing degree of the Si-containing fingerprint-resistant coating is qualified; if the attenuation rate a of the coating is larger than the standard value b, judging that the cross-linking curing degree of the Si-containing fingerprint-resistant coating is unqualified.
Furthermore, in the step 3), the value range of the standard value b is 4-20%. Preferably, the value range of the standard value b is 4-10%.
Compared with the prior art, the invention has the following advantages:
firstly, the method can quickly evaluate the crosslinking curing degree of the surface coating, and is quick, simple, convenient and effective;
secondly, the cross-linking curing degree of the coating is directly quantified, and the detection data and the cross-linking curing degree of the surface coating are directly linked, so that the method is easy to use on site for rapid evaluation;
thirdly, the cross-linking curing degree of the Si-containing fingerprint-resistant coating can be quickly and effectively evaluated, the quick release delivery of the steel mill coating product is facilitated, the quality dissatisfaction and payment caused by poor coating curing at a client side are reduced, and the profitability of the steel mill coating product is improved.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the embodiments, but they are not intended to limit the present invention and are only examples. While the advantages of the invention will be apparent and readily appreciated by the description.
The invention relates to a method for evaluating the cross-linking curing degree of a surface coating of a Si-containing fingerprint-resistant coating galvanized sheet, which comprises the following steps:
1) horizontally placing a to-be-tested Si-containing fingerprint-resistant coating galvanized plate, performing first wiping treatment by using absorbent cotton, selecting a test area, and performing first Si content measurement by using a portable X-ray fluorescence spectrometer to obtain an initial Si content m1；
2) Completely soaking absorbent cotton containing a 2-butanone solution into the to-be-detected Si-containing fingerprint-resistant coating galvanized sheet by using the absorbent cotton containing the 2-butanone solution and the 2-butanone solution, performing second wiping treatment to enable the angle between the absorbent cotton containing the 2-butanone solution and a test area of the Si-containing fingerprint-resistant coating galvanized sheet to be 30-60 degrees, and applying 500-800N of force to perform wiping at a wiping speed of 1-2 reciprocating back and forth per secondWiping, namely wiping 10-15 back and forth times in a fixed area with the length of more than or equal to 60mm in a test area of the galvanized plate with the Si fingerprint-resistant coating, and measuring the Si content for the second time in the same test area selected in the step 1) by adopting a portable X-ray fluorescence spectrometer, wherein the current Si content is m2；
3) According to the initial Si content m1And the current Si content m2Calculating a coating attenuation rate a, comparing the coating attenuation rate a with a set standard value b, and evaluating the cross-linking curing degree of the coating on the surface of the Si-containing fingerprint-resistant coating galvanized plate, wherein the coating attenuation rate a is calculated by the following method:
in the formula, m1Is the initial Si content, m2Is the current Si content. The value range of the standard value b is 4-20%, if the attenuation rate a of the coating is less than or equal to the standard value b, the cross-linking curing degree of the Si-containing fingerprint-resistant coating is judged to be qualified; if the attenuation rate a of the coating is larger than the standard value b, judging that the cross-linking curing degree of the Si-containing fingerprint-resistant coating is unqualified.
Example 1
Analyzing a certain batch of hot-dip galvanized Si-containing fingerprint-resistant coating plates, and selecting a test area to perform a first Si content test to 428mg/cm by using a portable X-ray fluorescence spectrometer2According to the method, 2-butanone wiping is carried out for 10 times, the portable X-ray fluorescence spectrometer is used again, the same test area is selected for carrying out the second Si content test to be 407mg/cm2The coating decay rate was 4.9%. The batch of products are sent to a client, and the quality of the products is good after degreasing, ultrasonic cleaning, high-temperature baking and coating, and the products are qualified for use.
Example 2
When a white spot defect appears after degreasing when a client side uses a hot-dip galvanized Si-containing fingerprint-resistant coating plate produced in a certain batch, sampling a sample wafer at the client side, and selecting a test area to perform a first Si content test of 474mg/cm by using a portable X-ray fluorescence spectrometer2According to the method of the invention, 2-butanone wiping is carried outWiping 10 round trips, using the portable X-ray fluorescence spectrometer again, selecting the same test area for a second Si content test of 327mg/cm2The coating attenuation rate is 31.0%, and the coating is analyzed to be poor in baking and curing and cause white spot defects after the coating is degreased by alkali.
Example 3
When a hot-dip galvanized Si-containing fingerprint-resistant coating plate produced in a certain batch is punched and cracked when a client side is used, a sample wafer is taken from the client side for trial use, a portable X-ray fluorescence spectrometer is used, and a test area is selected for carrying out the first Si content test to 486mg/cm2According to the method, the 2-butanone wiping is carried out for 10 times, the portable X-ray fluorescence spectrometer is used again, the same test area is selected for carrying out the second Si content test to 68mg/cm2The coating decay rate was 86.0%, and it was analyzed that the coating was poorly cured by baking and poorly lubricated, resulting in cracking after stamping.
Example 4
When a hot-dip galvanized Si-containing fingerprint-resistant coating plate produced in a certain batch has a yellowing defect after being baked when being used by a client, sampling a sample wafer at the client, selecting a test area by using a portable X-ray fluorescence spectrometer, and carrying out a first Si content test to obtain 394mg/cm2According to the method, the 2-butanone wiping is carried out for 10 times, the portable X-ray fluorescence spectrometer is used again, the same test area is selected for carrying out the second Si content test to be 142mg/cm2The coating attenuation rate is 63.9%, and the analysis shows that the coating is not cured well after being baked at high temperature, and the coating has yellowing defects after being baked at high temperature.
The above description is only an embodiment of the present invention, and it should be noted that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention, and the rest that is not described in detail is the prior art.
Claims (10)
1. A method for evaluating the cross-linking curing degree of a surface coating of a Si-containing fingerprint-resistant coating galvanized sheet is characterized by comprising the following steps: the method comprises the following steps:
1) after the first wiping treatment of the to-be-detected Si-containing fingerprint-resistant coating galvanized plate by absorbent cotton, selecting a test area for carrying out the first Si content measurement, and calculating the initial Si content m1；
2) Performing second wiping treatment on the to-be-detected Si-containing fingerprint-resistant coating galvanized plate by using absorbent cotton containing 2-butanone solution, and performing second Si content measurement in the same test area selected in the step 1) to obtain the current Si content m2；
3) According to the initial Si content m1And the current Si content m2And (3) calculating the attenuation rate a of the coating, and comparing the attenuation rate a of the coating with a set standard value b to evaluate the crosslinking and curing degree of the coating on the surface of the Si-containing fingerprint-resistant coating galvanized plate.
2. The method for evaluating the crosslinking curing degree of the surface coating of the galvanized sheet with the Si fingerprint-resistant coating according to claim 1, wherein the method comprises the following steps: in the step 1), the to-be-detected Si-containing fingerprint-resistant coating galvanized plate is horizontally placed.
3. The method for evaluating the crosslinking curing degree of the surface coating of the galvanized sheet with the Si fingerprint-resistant coating according to claim 1, wherein the method comprises the following steps: in the step 1), a portable X-ray fluorescence spectrometer is adopted to carry out the first Si content measurement on a test area selected by the to-be-tested Si-containing fingerprint-resistant coating galvanized plate.
4. The method for evaluating the crosslinking curing degree of the surface coating of the galvanized sheet with the Si fingerprint-resistant coating according to claim 1, wherein the method comprises the following steps: in the step 2), the absorbent cotton is completely soaked by the 2-butanone solution, and the absorbent cotton is kept wet in the wiping process.
5. The method for evaluating the crosslinking curing degree of the surface coating of the galvanized sheet with the Si fingerprint-resistant coating according to claim 1, wherein the method comprises the following steps: in the step 2), the angle between the absorbent cotton containing the 2-butanone solution and the test area of the Si-containing fingerprint-resistant coating galvanized plate is 30-60 degrees, and 500-800N of force is applied to wipe the plate at a wiping speed of 1-2 reciprocating back and forth per second.
6. The method for evaluating the crosslinking curing degree of the surface coating of the galvanized sheet with the Si fingerprint-resistant coating according to claim 1, wherein the method comprises the following steps: in the step 2), a fixed area with the length being more than or equal to 60mm is selected in the test area of the Si-containing fingerprint-resistant coating galvanized plate to be wiped for 10-15 times to-and-fro movements.
7. The method for evaluating the crosslinking curing degree of the surface coating of the galvanized sheet with the Si fingerprint-resistant coating according to claim 1, wherein the method comprises the following steps: and in the step 2), a portable X-ray fluorescence spectrometer is adopted to carry out second Si content measurement on a test area selected by the to-be-tested Si-containing fingerprint-resistant coating galvanized plate.
8. The method for evaluating the cross-linking curing degree of the surface coating of the galvanized sheet with the Si fingerprint-resistant coating according to any one of claims 1 to 7, wherein the method comprises the following steps: in the step 3), the coating attenuation rate a is calculated as follows:
in the formula, m1Is the initial Si content, m2Is the current Si content.
9. The method for evaluating the crosslinking curing degree of the surface coating of the galvanized sheet with the Si-containing fingerprint-resistant coating according to claim 8, wherein the method comprises the following steps: in the step 3), if the attenuation rate a of the coating is less than or equal to the standard value b, judging that the cross-linking curing degree of the Si-containing fingerprint-resistant coating is qualified; if the attenuation rate a of the coating is larger than the standard value b, judging that the cross-linking curing degree of the Si-containing fingerprint-resistant coating is unqualified.
10. The method for evaluating the crosslinking curing degree of the surface coating of the galvanized sheet with the Si-containing fingerprint-resistant coating according to claim 9, wherein the method comprises the following steps: in the step 3), the value range of the standard value b is 10-20%.
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