Teflon plastic film corrosion resistance detection reagent and detection method

Abstract

The present invention discloses a reagent and method for detecting the corrosion resistance of Teflon plastic films. The reagent comprises 9 ml of dichloromethane and 0.1-2 ml of pure water, at least part of which is dispersed in the form of emulsified particles. The reagent has a simple composition, good real-time preparation, and is easy to prepare. It also exhibits good peelability for Teflon products, allowing for efficient and convenient detection.

Description

Technical Field

[0001] The present invention relates to a film product detection technology, in particular to a Teflon plastic film corrosion resistance detection reagent and a detection method. Background Art

[0002] Plastic coating is a product of the spraying industry, commonly known as Teflon, which is a coating and a high-quality surface treatment method. Its characteristics are: 1. Non-stickiness: Almost all substances do not adhere to the polytetrafluoroethylene coating; 2. Heat resistance: It can withstand high temperatures up to 300℃ for a short time and can generally be used continuously between 240℃ and 260℃. It has significant thermal stability. It can work at freezing temperatures without becoming brittle and does not melt at high temperatures; 3. Sliding: It has a low friction coefficient. The friction coefficient changes when the load slides, but the value is only between 0.05-0. .15; 4. Moisture resistance: The surface is impervious to water and oil. If a small amount of dirt is found, it can be cleaned with a simple wipe; 5. Wear resistance: Under high loads, it has excellent wear resistance. Under certain loads, it has the dual advantages of wear resistance and non-stick properties; 6. Corrosion resistance: It is virtually unaffected by chemicals and can withstand all strong acids (including aqua regia) except molten alkali metals, fluorinated media, and sodium hydroxide above 300°C, as well as strong oxidizers, reducing agents, and various organic solvents, protecting parts from all types of chemical corrosion. The coating condition must be tested and confirmed during the production process. Existing testing technology cannot quickly separate multiple plastic film layers, affecting testing efficiency and quality.

[0003] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide a Teflon plastic film corrosion resistance detection reagent and detection method, which has a simple composition, good real-time preparation, convenient preparation, good peeling property for Teflon products, and efficient and convenient detection.

[0005] To achieve the above objectives, an embodiment of the present invention provides a Teflon plastic film corrosion resistance detection reagent, the raw materials of which include 9 ml of dichloromethane and 0.1-2 ml of pure water; wherein at least a portion of the pure water forms emulsified particles dispersed throughout the system.

[0006] In one or more embodiments of the present invention, the average particle size of the emulsified microparticles is in the range of 1-20 μm.

[0007] In one or more embodiments of the present invention, the particle size distribution of the emulsified particles satisfies a Gaussian distribution, and the particle size D corresponding to the peak value is positively correlated with the film thickness d of the Teflon plastic film to be tested.

[0008] In one or more embodiments of the present invention, the positive correlation between the particle size D and the film thickness d satisfies: D=x*d, where x satisfies 0.01-0.5.

[0009] In one or more embodiments of the present invention, the portion of pure water involved in emulsifying the microparticles accounts for 5-20 wt.% of the total amount of pure water.

[0010] In one or more embodiments of the present invention, a detection method using the aforementioned Teflon plastic film corrosion resistance detection reagent includes the following steps: sample preparation: sample glue filling, cutting and grinding, sample polishing to form a detection surface; sample corrosion: taking the Teflon plastic film corrosion resistance detection reagent, applying it to the detection surface for corrosion; detection: rinsing the corroded detection surface and observing the corrosion effect.

[0011] In one or more embodiments of the present invention, in the step of sample preparation, the Ra value of the polished surface of the sample after polishing is no greater than 0.2.

[0012] In one or more embodiments of the present invention, during sample preparation, the polishing is performed by spraying alumina polishing liquid, 3μm diamond polishing liquid, and 1μm diamond polishing liquid onto the center of the grinding disc in sequence, with a polishing water flow rate of 20-30 drops / min and a grinding disc speed of 600-800 rpm.

[0013] In one or more embodiments of the present invention, the sample filling in the sample preparation step is to fix the sample with UV conductive glue and then cure it with ultraviolet light.

[0014] In one or more embodiments of the present invention, the cutting and grinding in the sample preparation step is to perform grinding exposure on the sample after being fixed with UV conductive adhesive.

[0015] Compared to existing technologies, the Teflon plastic film corrosion resistance testing reagent and testing method according to the present invention utilizes an optimized, simple corrosion reagent formulation, enabling real-time preparation during testing. This method exhibits excellent stability, enabling multiple tests with a single preparation within the same batch of experiments, meeting all-day testing needs and providing ease of use. Furthermore, the reagent exhibits excellent testing performance, with excellent ability to detect coated glass products, good delamination, and no surface residue. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a photograph of the corrosion effect according to one embodiment of the present invention. DETAILED DESCRIPTION

[0017] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0018] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising", etc., will be understood to include the stated elements or components but not to exclude other elements or other components.

[0019] In the following examples, the thickness D of the Teflon coated film sample is selected to be 10 microns, and this is used as an example to illustrate the invention scheme. However, the thickness of other conventional coated products can also meet the implementation requirements of the invention scheme.

[0020] Example 11

[0021] The Teflon plastic film corrosion resistance detection reagent of this embodiment comprises 9 ml of dichloromethane and 0.1 ml of pure water. The reagent is dispersed ultrasonically to form an emulsion. The average particle size of the emulsified particles is 1 μm, and the emulsion is stable for more than 8 hours.

[0022] The test process includes the following steps: (1) Sample glue filling: fix the sample to be tested in a glue box, add UV conductive glue, and cure it under ultraviolet light for 1 minute; (2) Cutting and grinding: cut and expose the cured sample, and grind the sample in sequence with sandpaper 120#, 240#, 500#, 1000#, 1500#, 2000#, 2500#, 3000#, and 4000#, each grinding for 15 minutes until the current grinding effect is achieved; (3) Sample polishing: spray aluminum oxide on the center of the grinding disc for polishing----Polishing water flow: 20 drops per minute is the best, and the optimal speed is: 600 rpm, and then polished with 3μm diamond polishing liquid and 1μm diamond polishing liquid under the same conditions. The Ra value of the polished surface after polishing is 0.15-0.2; (4) Sample corrosion: soak the precision wiping paper in the corrosive agent, and spread the soaked precision wiping paper on the sample surface for corrosion (pay attention to control the corrosion time. If the time is too long, the coating will be eaten by the corrosive liquid. If the time is too short, the coating layers cannot be separated). Stay for 20 seconds; (5) Sample cleaning: rinse the sample stained with the corrosive liquid under clean water, and wipe the water stains on the surface with precision wiping paper; (6) Metallographic photography and preservation: put the sample under the lens of OLYMPUS BX53M and magnify it 500X, take a picture and save it.

[0023] like Figure 1 As shown, the metallographic photographs of the control sample of the detection reagent in this embodiment before and after corrosion indicate that the scheme of this embodiment has good delamination and peeling performance for the Teflon coated film sample, and the delamination interface is clear. Comparison before and after corrosion shows that the sample has good plating adhesion.

[0024] Example 12

[0025] The Teflon plastic film corrosion resistance detection reagent of this embodiment includes 9 ml of dichloromethane and 1 ml of pure water. The reagent is mechanically stirred and dispersed at 15,000 rpm to form an emulsion. The average particle size of the emulsified particles is 10 μm, and the emulsion is stable for more than 8 hours.

[0026] The test includes the following steps: (1) Sample glue filling: fix the sample to be tested in the glue box, add UV conductive glue, and cure it under ultraviolet light for 2 minutes; (2) Cutting and grinding: cut and expose the cured sample, and grind the sample in sequence with sandpaper 120#, 240#, 500#, 1000#, 1500#, 2000#, 2500#, 3000#, and 4000#, each grinding for 20 minutes until the current grinding effect is achieved; (3) Sample polishing: spray aluminum oxide on the center of the grinding disc for polishing----Polishing water flow: 25 drops per minute is the best, and the best speed is: 700 rpm, and then polished with 3μm diamond polishing liquid and 1μm diamond polishing liquid under the same conditions, and the Ra value of the polished surface after polishing was 0.1-0.15; (4) Sample corrosion: Precision wiping paper was soaked in the corrosive agent, and the soaked precision wiping paper was spread on the sample surface for corrosion (pay attention to control the corrosion time, if the time is too long, the coating will be eaten by the corrosive liquid, and if the time is too short, the coating layers cannot be separated), and stay for 19 seconds; (5) Sample cleaning: The sample stained with the corrosive liquid was rinsed in clean water, and the water stains on the surface were wiped clean with precision wiping paper; (6) Metallographic photography and preservation: OLYMPUS BX53M put the sample under the lens and magnified it 500X, took pictures and preserved them, and compared the metallographic pictures before and after the corrosion of the sample, it was shown that the scheme of this embodiment has good delamination and peeling performance for the Teflon coated plastic film sample, and the delamination interface is clear. Comparison before and after corrosion shows that the sample has good plating bonding.

[0027] Example 13

[0028] The Teflon plastic film corrosion resistance detection reagent of this embodiment comprises 9 ml of dichloromethane and 2 ml of pure water. The reagent is mechanically stirred and dispersed at a speed of 10,000 rpm to form an emulsion. The average particle size of the emulsified particles is 20 μm, and the emulsion is stable for more than 8 hours.

[0029] The test process includes the following steps: (1) Sample glue filling: fix the sample to be tested in a glue box, add UV conductive glue, and cure it under ultraviolet light for 3 minutes; (2) Cutting and grinding: cut and expose the cured sample, and grind the sample in sequence with sandpaper 120#, 240#, 500#, 1000#, 1500#, 2000#, 2500#, 3000#, and 4000#, each grinding for 30 minutes until the current grinding effect is achieved; (3) Sample polishing: spray aluminum oxide on the center of the grinding disc for polishing----Polishing water flow: 30 drops per minute is the best, and the best speed is 8 00 rpm, and then polished with 3μm diamond polishing liquid and 1μm diamond polishing liquid under the same conditions, and the Ra value of the polished surface after polishing was 0.05-0.10; (4) Sample corrosion: Precision wiping paper was soaked in the corrosive agent, and the soaked precision wiping paper was spread on the sample surface for corrosion (pay attention to control the corrosion time, if the time is too long, the coating will be eaten by the corrosive liquid, and if the time is too short, the coating layers cannot be separated), and stay for 22 seconds; (5) Sample cleaning: The sample stained with the corrosive liquid was rinsed in clean water, and the water stains on the surface were wiped clean with precision wiping paper; (6) Metallographic photography and preservation: OLYMPUS BX53M put the sample under the lens and magnified it 500X, took pictures and preserved them, and compared the metallographic pictures before and after the corrosion of the sample, it was shown that the scheme of this embodiment has good delamination and peeling performance for the Teflon coated plastic film sample, and the delamination interface is clear. Comparison before and after corrosion shows that the sample has good plating bonding.

[0030] Example 21

[0031] The only difference between the Teflon plastic film corrosion resistance detection reagent of this embodiment and Example 11 is that the particle size distribution of the emulsified particles satisfies the Gaussian distribution, and the particle size D corresponding to the peak is positively correlated with the film thickness d of the Teflon plastic film to be tested. The positive correlation between the particle size D and the film thickness d satisfies: D=0.01*d, and the emulsion is stable for more than 8 hours.

[0032] The detection method is as shown in Example 1. The metallographic photographs of the control sample before and after corrosion show that the scheme of this embodiment has good delamination and peeling performance for the Teflon coated film sample, the delamination interface is clear, the exposed part of the sample is fully delaminated, there is no curling, and there is no residue on the surface. Comparison before and after corrosion shows that the sample has good plating adhesion.

[0033] Example 22

[0034] The only difference between the Teflon plastic film corrosion resistance detection reagent of this embodiment and Example 12 is that the particle size distribution of the emulsified particles satisfies the Gaussian distribution, and the particle size D corresponding to the peak is positively correlated with the film thickness d of the Teflon plastic film to be tested. The positive correlation between the particle size D and the film thickness d satisfies: D=0.3*d, and the emulsion is stable for more than 8 hours.

[0035] The detection method is as shown in Example 2. The metallographic photographs of the control sample before and after corrosion show that the scheme of this embodiment has good delamination and peeling performance for the Teflon coated film sample, the delamination interface is clear, the exposed part of the sample is fully delaminated, there is no curling, and there is no residue on the surface. Comparison before and after corrosion shows that the sample has good plating adhesion.

[0036] Example 23

[0037] The only difference between the Teflon plastic film corrosion resistance detection reagent of this embodiment and Example 13 is that the particle size distribution of the emulsified particles satisfies the Gaussian distribution, and the particle size D corresponding to the peak is positively correlated with the film thickness d of the Teflon plastic film to be tested. The positive correlation between the particle size D and the film thickness d satisfies: D=0.5*d, and the emulsion is stable for more than 8 hours.

[0038] The detection method is as shown in Example 3. The metallographic photographs of the control sample before and after corrosion show that the scheme of this embodiment has good delamination and peeling performance for the Teflon coated film sample, the delamination interface is clear, the exposed part of the sample is fully delaminated, there is no curling, and there is no residue on the surface. Comparison before and after corrosion shows that the sample has good plating adhesion.

[0039] Example 31

[0040] The only difference between the Teflon plastic film corrosion resistance detection reagent of this embodiment and Example 21 is that the portion of pure water involved in the emulsified particles accounts for 5wt.% of the total amount of pure water, and the emulsion is stable for more than 8 hours.

[0041] The detection method is as shown in Example 1. The metallographic photographs of the control sample before and after corrosion show that the scheme of this embodiment has good delamination and peeling performance for the Teflon coated film sample, the delamination interface is clear, the exposed part of the sample is fully delaminated, there is no curling, and there is no residue on the surface. Comparison before and after corrosion shows that the sample has good plating adhesion.

[0042] Example 32

[0043] The only difference between the Teflon plastic film corrosion resistance detection reagent of this embodiment and Example 22 is that the portion of pure water involved in the emulsified particles accounts for 10 wt.% of the total amount of pure water, and the emulsion is stable for more than 8 hours.

[0044] The detection method is as shown in Example 2. The metallographic photographs of the control sample before and after corrosion show that the scheme of this embodiment has good delamination and peeling performance for the Teflon coated film sample, the delamination interface is clear, the exposed part of the sample is fully delaminated, there is no curling, and there is no residue on the surface. Comparison before and after corrosion shows that the sample has good plating adhesion.

[0045] Example 33

[0046] The only difference between the Teflon plastic film corrosion resistance detection reagent of this embodiment and Example 23 is that the portion of pure water involved in the emulsified particles accounts for 20 wt.% of the total amount of pure water, and the emulsion is stable for more than 8 hours.

[0047] The detection method is as shown in Example 3. The metallographic photographs of the control sample before and after corrosion show that the scheme of this embodiment has good delamination and peeling performance for the Teflon coated film sample, the delamination interface is clear, the exposed part of the sample is fully delaminated, there is no curling, and there is no residue on the surface. Comparison before and after corrosion shows that the sample has good plating adhesion.

[0048] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A Teflon plastic film corrosion resistance detection reagent, the raw materials of which include 9 ml of dichloromethane and 0.1-2 ml of pure water; wherein, At least a portion of the pure water forms emulsified particles dispersed throughout the system. The average particle size of the emulsified particles is in the range of 1-20 μm. The particle size distribution of the emulsified particles satisfies a Gaussian distribution, and the particle size D corresponding to the peak value is positively correlated with the film thickness d of the Teflon plastic film to be tested. The positive correlation between the particle size D and the film thickness d satisfies the following relationship: D=x*d, where x satisfies 0.01-0.

5. The portion of the pure water that participates in the emulsified particles accounts for 5-20 wt.% of the total amount of the pure water.

2. A method for detecting the corrosion resistance of Teflon plastic film using the reagent for detecting the corrosion resistance of Teflon plastic film according to claim 1, comprising the following steps: Sample preparation: sample filling, cutting and grinding, sample polishing to form the test surface; Sample corrosion: take the Teflon plastic film corrosion resistance test reagent, apply it to the test surface and corrode it; Inspection: Rinse the corroded inspection surface and observe the corrosion effect.

3. The detection method according to claim 2, wherein In the sample preparation step, the Ra value of the polished surface of the sample after polishing is not greater than 0.

2.

4. The detection method according to claim 2, wherein The sample preparation was polished by spraying alumina polishing liquid, 3 μm diamond polishing liquid, and 1 μm diamond polishing liquid onto the center of the grinding disc in sequence, with a polishing water flow rate of 20-30 drops / min and a grinding disc speed of 600-800 rpm.

5. The detection method according to claim 2, wherein In the sample preparation step, the sample is glued by fixing the sample with UV conductive glue and then curing it with ultraviolet light.

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