Water-based Teflon non-stick coating and preparation method thereof

Abstract

The invention discloses a water-based Teflon non-stick coating and a preparation method thereof, and belongs to the technical field of coatings, the water-based Teflon non-stick coating comprises the following raw materials by weight: 1.5-2% of a thickener, 0.8-1.3% of dimethylethanolamine, 2.5-4.2% of pearl powder, 3-5% of an adhesion promoter, 25.3-31.3% of deionized water, 1-2% of carbon black, 0.4-1.2% of a wetting agent, 0.5-1% of a leveling agent, 1.8-2.3% of wear-resistant powder, and 1-5% of a hardening agent. The balance is polytetrafluoroethylene emulsion. Through the mode, the prepared water-based Teflon single-layer non-stick coating does not need to be sprayed for the second time, the coating has high abrasion resistance, meanwhile, the surface of the coating is good in anti-adhesion performance, and the adhesive force between the coating and the surface of a base body is high.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a water-based Teflon non-stick coating and a preparation method thereof. Background Art

[0002] Polytetrafluoroethylene, commonly known as Teflon, is a high-performance fluoropolymer. Teflon's excellent non-stick properties, corrosion resistance, heat resistance and other properties make it widely used in coatings such as non-stick pan coatings.

[0003] In order to ensure both the adhesion between the coating and the substrate and the non-stick properties of the coating surface, traditional Teflon coatings use a secondary spraying method. That is, traditional Teflon coatings are composed of a primer and a topcoat. The secondary spraying operation is relatively cumbersome, increasing labor and material costs and low production efficiency.

[0004] To expand the application of Teflon materials in the coatings field, the prior art has made numerous improvements to Teflon coatings and their preparation methods. For example, Chinese Patent CN109762405A discloses a single-layer Teflon coating comprising, by weight, 30-40 parts polytetrafluoroethylene resin, 30-35 parts epoxy resin, 2-5 parts leveling agent, 0.5-1 part defoamer, 2-5 parts pigment, 1-5 parts high-temperature resistant powder, and 60-70 parts solvent. The high-temperature resistant powder comprises, by weight, 20-30 parts carbon fiber, 10-15 parts glass powder, 1-5 parts cerium oxide, 1-2 parts graphene, and 5-10 parts antimony trioxide. This Teflon coating improves the coating's high-temperature and corrosion resistance to a certain extent.

[0005] However, there are still the following shortcomings: 1. The adhesion between the coating and the substrate and the long-term non-stick performance of the coating surface need to be further enhanced.

[0006] 2. The wear resistance of the coating itself is insufficient and needs further improvement.

[0007] Based on this, the present invention designs a water-based Teflon non-stick coating and a preparation method thereof to solve the above problems. Summary of the Invention

[0008] In view of the above-mentioned shortcomings of the prior art, the present invention provides a water-based Teflon non-stick coating and a preparation method thereof.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: A water-based Teflon non-stick coating comprises the following raw materials, calculated by weight percentage: 1.5-2% thickener, 0.8-1.3% dimethylethanolamine, 2.5-4.2% pearlescent powder, 3-5% adhesion promoter, 25.3-31.3% deionized water, 1-2% carbon black, 0.4-1.2% wetting agent, 0.5-1% leveling agent, 1.8-2.3% wear-resistant powder, 1-5% hardener, and the balance being polytetrafluoroethylene emulsion; Furthermore, the thickener is hydroxyethyl cellulose, and the pearlescent powder is titanium dioxide; Furthermore, the adhesion promoter is a metal salt of acrylic acid, and the wetting agent is N,N'-dialkyl malic acid amide; Furthermore, the leveling agent is made of acrylate phosphate, and the wear-resistant powder is made by mixing ceramic powder and silicon carbide powder in a weight ratio of 1:1-1.2; Furthermore, the hardening agent is hydrophobic nano-silica; In order to better achieve the purpose of the present invention, the present invention also provides a method for preparing a water-based Teflon non-stick coating, comprising the following steps: Step 1: Mix carbon black, wear-resistant powder and hardener and perform ultrasonic treatment for 0.5-1h. Step 2: Place the ultrasonically treated mixture in a cobalt source irradiation chamber for irradiation at a dose of 10-20 kGy for 10-15 seconds. Step 3: Mix the irradiated mixture with the remaining raw materials, and disperse them at a low speed of 100-300 r / min for 10-15 minutes to obtain a water-based Teflon non-stick coating; Furthermore, the ultrasonic processor responsible for ultrasonic treatment has a vibration frequency of 20-30kHz and a power of 600-900W; Furthermore, the method of using the water-based Teflon non-stick coating is: clean the surface of the workpiece, and after cleaning, use a plasma spraying device to evenly spray the Teflon coating composition on the surface of the workpiece with a thickness of 10-25 microns, and then dry it to form a water-based Teflon non-stick coating.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. The single-layer water-based Teflon non-stick coating prepared by the present invention has high wear resistance and good anti-adhesion performance on the coating surface; 2. The water-based Teflon non-stick coating has strong adhesion to the substrate surface. DETAILED DESCRIPTION

[0011] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0012] Example 1: Preparation of a water-based Teflon non-stick coating comprises the following steps: Step 1: Weigh the raw materials according to the following weight percentages: thickener 1.5% (hydroxyethyl cellulose), dimethylethanolamine 1.3%, pearl powder 2.5% (titanium dioxide), adhesion promoter 5% (acrylate metal salt), deionized water 25.3%, carbon black 2%, wetting agent 0.4% (N,N'-dialkyl malic amide), leveling agent 1% (acrylate phosphate), wear-resistant powder 1.8%, hardening agent 5% (hydrophobic nano-silica), and the balance is polytetrafluoroethylene emulsion, the leveling agent is acrylate phosphate, and the wear-resistant powder is prepared by mixing ceramic powder and silicon carbide powder in a weight ratio of 1:1; Step 2: Mix the carbon black, wear-resistant powder and hardener and perform ultrasonic treatment for 0.5 h. The ultrasonic processor responsible for the ultrasonic treatment has a vibration frequency of 30 kHz and a power of 900 W. Step 3: placing the ultrasonically treated mixture in a cobalt source irradiation chamber for irradiation at a dose of 10 kGy for 15 seconds; Step 4: Mix the irradiated mixture with the remaining raw materials, and disperse them at a low speed of 100 r / min for 15 minutes to obtain a water-based Teflon non-stick coating; Step 5: Clean the surface of the workpiece. After cleaning, use plasma spraying equipment to evenly spray the Teflon coating composition on the surface of the workpiece with a thickness of 10 microns. After drying, a water-based Teflon non-stick coating can be formed.

[0013] Example 2: Preparation of a water-based Teflon non-stick coating comprises the following steps: Step 1: Weigh the raw materials according to the following weight percentages: thickener 2% (hydroxyethyl cellulose), dimethylethanolamine 0.8%, pearl powder 4.2% (titanium dioxide), adhesion promoter 3% (acrylate metal salt), deionized water 31.3%, carbon black 1%, wetting agent 1.2% (N,N'-dialkyl malic amide), leveling agent 0.5% (acrylate phosphate), wear-resistant powder 2.3%, hardening agent 1% (hydrophobic nano-silica), and the balance is polytetrafluoroethylene emulsion, the leveling agent is acrylate phosphate, and the wear-resistant powder is prepared by mixing ceramic powder and silicon carbide powder in a weight ratio of 1:1.2; Step 2: Mix the carbon black, wear-resistant powder and hardener and perform ultrasonic treatment for 1 hour. The ultrasonic processor responsible for the ultrasonic treatment has a vibration frequency of 20 kHz and a power of 600 W. Step 3: placing the ultrasonically treated mixture in a cobalt source irradiation chamber for irradiation at a dose of 20 kGy for 10 s; Step 4: Mix the irradiated mixture with the remaining raw materials, and disperse them at a low speed of 300 r / min for 10 minutes to obtain a water-based Teflon non-stick coating; Step 5: Clean the surface of the workpiece. After cleaning, use plasma spraying equipment to evenly spray the Teflon coating composition on the surface of the workpiece with a thickness of 25 microns. After drying, a water-based Teflon non-stick coating can be formed.

[0014] Example 3: Preparation of a water-based Teflon non-stick coating comprises the following steps: Step 1: Weigh the raw materials according to the following weight percentages: thickener 1.8% (hydroxyethyl cellulose), dimethylethanolamine 1%, pearl powder 3% (titanium dioxide), adhesion promoter 3.5% (acrylate metal salt), deionized water 30%, carbon black 1.5%, wetting agent 1% (N,N'-dialkyl malic amide), leveling agent 0.9% (acrylate phosphate), wear-resistant powder 2.1%, hardening agent 2% (hydrophobic nano-silica), and the balance is polytetrafluoroethylene emulsion, the leveling agent is acrylate phosphate, and the wear-resistant powder is prepared by mixing ceramic powder and silicon carbide powder in a weight ratio of 1:1.1; Step 2: Mix the carbon black, wear-resistant powder and hardener and perform ultrasonic treatment for 0.6 h. The ultrasonic processor responsible for the ultrasonic treatment has a vibration frequency of 25 kHz and a power of 750 W. Step 3: placing the ultrasonically treated mixture in a cobalt source irradiation chamber for irradiation at a dose of 15 kGy for 12 seconds; Step 4: Mix the irradiated mixture with the remaining raw materials, and disperse them at a low speed of 200 r / min for 12 minutes to obtain a water-based Teflon non-stick coating; Step 5: Clean the surface of the workpiece. After cleaning, use plasma spraying equipment to evenly spray the Teflon coating composition on the surface of the workpiece with a thickness of 20 microns. After drying, a water-based Teflon non-stick coating can be formed.

[0015] Example 4: Preparation of a water-based Teflon non-stick coating comprises the following steps: Step 1: Weigh the raw materials according to the following weight percentages: 1.6% thickener (hydroxyethyl cellulose), 0.9% dimethylethanolamine, 3.2% pearlescent powder (titanium dioxide), 3.5% adhesion promoter (metallic acrylate), 28% deionized water, 1.2% carbon black, 0.5% wetting agent (N,N'-dialkyl malic amide), 0.6% leveling agent (acrylate phosphate), 2% wear-resistant powder, 1.5% hardening agent (hydrophobic nano-silica), and the balance is polytetrafluoroethylene emulsion, wherein the leveling agent is acrylate phosphate, and the wear-resistant powder is prepared by mixing ceramic powder and silicon carbide powder in a weight ratio of 1:1.05; Step 2: Mix the carbon black, wear-resistant powder and hardener and perform ultrasonic treatment for 0.7 hours. The ultrasonic processor responsible for the ultrasonic treatment has a vibration frequency of 20 kHz and a power of 600 W. Step 3: placing the ultrasonically treated mixture in a cobalt source irradiation chamber for irradiation at a dose of 12 kGy for 10 s; Step 4: Mix the irradiated mixture with the remaining raw materials, and disperse them at a low speed of 150 r / min for 12 minutes to obtain a water-based Teflon non-stick coating; Step 5: Clean the surface of the workpiece. After cleaning, use plasma spraying equipment to evenly spray the Teflon coating composition on the surface of the workpiece with a thickness of 15 microns. After drying, a water-based Teflon non-stick coating can be formed.

[0016] Example 5: Preparation of a water-based Teflon non-stick coating comprises the following steps: Step 1: Weigh the raw materials according to the following weight percentages: thickener 1.8% (hydroxyethyl cellulose), dimethylethanolamine 1.2%, pearl powder 4% (titanium dioxide), adhesion promoter 4.2% (acrylate metal salt), deionized water 30%, carbon black 1.7%, wetting agent 1.1% (N,N'-dialkyl malic amide), leveling agent 0.9% (acrylate phosphate), wear-resistant powder 2.1%, hardening agent 4.2% (hydrophobic nano-silica), and the balance is polytetrafluoroethylene emulsion, the leveling agent is acrylate phosphate, and the wear-resistant powder is prepared by mixing ceramic powder and silicon carbide powder in a weight ratio of 1:1.15; Step 2: Mix the carbon black, wear-resistant powder and hardener and perform ultrasonic treatment for 0.8 h. The ultrasonic processor responsible for the ultrasonic treatment has a vibration frequency of 30 kHz and a power of 900 W. Step 3: placing the ultrasonically treated mixture in a cobalt source irradiation chamber for irradiation at a dose of 18 kGy for 13 seconds; Step 4: Mix the irradiated mixture with the remaining raw materials, and disperse them at a low speed of 250 r / min for 11 minutes to obtain a water-based Teflon non-stick coating; Step 5: Clean the surface of the workpiece. After cleaning, use plasma spraying equipment to evenly spray the Teflon coating composition on the surface of the workpiece with a thickness of 23 microns. After drying, a water-based Teflon non-stick coating can be formed.

[0017] Comparative Example 1: Different from Example 3, step 2 is not performed.

[0018] The preparation of a water-based Teflon non-stick coating comprises the following steps: Step 1: Weigh the raw materials according to the following weight percentages: thickener 1.8% (hydroxyethyl cellulose), dimethylethanolamine 1%, pearl powder 3% (titanium dioxide), adhesion promoter 3.5% (acrylate metal salt), deionized water 30%, carbon black 1.5%, wetting agent 1% (N,N'-dialkyl malic amide), leveling agent 0.9% (acrylate phosphate), wear-resistant powder 2.1%, hardening agent 2% (hydrophobic nano-silica), and the balance is polytetrafluoroethylene emulsion, the leveling agent is acrylate phosphate, and the wear-resistant powder is prepared by mixing ceramic powder and silicon carbide powder in a weight ratio of 1:1.1; Step 2: Mix carbon black, wear-resistant powder and hardener and place them in a cobalt source irradiation chamber for irradiation at a dose of 15 kGy for 12 seconds. Step 3: Mix the irradiated mixture with the remaining raw materials, and disperse them at a low speed of 200 r / min for 12 minutes to obtain a water-based Teflon non-stick coating; Step 4: Clean the surface of the workpiece. After cleaning, use plasma spraying equipment to evenly spray the Teflon coating composition on the surface of the workpiece with a thickness of 20 microns. After drying, a water-based Teflon non-stick coating can be formed.

[0019] Comparative Example 2: Different from Example 3, step 3 is not performed.

[0020] The preparation of a water-based Teflon non-stick coating comprises the following steps: Step 1: Weigh the raw materials according to the following weight percentages: thickener 1.8% (hydroxyethyl cellulose), dimethylethanolamine 1%, pearl powder 3% (titanium dioxide), adhesion promoter 3.5% (acrylate metal salt), deionized water 30%, carbon black 1.5%, wetting agent 1% (N,N'-dialkyl malic amide), leveling agent 0.9% (acrylate phosphate), wear-resistant powder 2.1%, hardening agent 2% (hydrophobic nano-silica), and the balance is polytetrafluoroethylene emulsion, the leveling agent is acrylate phosphate, and the wear-resistant powder is prepared by mixing ceramic powder and silicon carbide powder in a weight ratio of 1:1.1; Step 2: Mix the carbon black, wear-resistant powder and hardener and perform ultrasonic treatment for 0.6 h. The ultrasonic processor responsible for the ultrasonic treatment has a vibration frequency of 25 kHz and a power of 750 W. Step 3: Mix the ultrasonically treated mixture with the remaining raw materials, and disperse them at a low speed of 200 r / min for 12 minutes to obtain a water-based Teflon non-stick coating; Step 4: Clean the surface of the workpiece. After cleaning, use plasma spraying equipment to evenly spray the Teflon coating composition on the surface of the workpiece with a thickness of 20 microns. After drying, a water-based Teflon non-stick coating can be formed.

[0021] Test Example: The coatings prepared in Examples 1-3 and the comparative example were subjected to relevant performance tests. The specific methods are as follows: The adhesion between the coating and the substrate surface was tested using a multifunctional scratch tester with a test load of 0-120N; The anti-adhesion performance of the coating surface was tested using a contact angle meter at room temperature. The wear resistance of the coating was tested using a room temperature friction and wear tester with a test load of 2N, a speed of 320rpm, and a time of The friction time is 40 min, and the friction partner is a 40Cr steel ball with a diameter of 6 mm.

[0022] The test results are shown in Table 1.

[0023] Table 1

[0024] As can be seen from Table 1, in Comparative Examples 1 and 2, if step 2 or step 3 is not performed, the wear resistance of the prepared coating, the anti-adhesive performance of the coating surface, and the adhesion between the coating and the substrate surface will all decrease; in particular, in Comparative Example 2, if step 3 is not performed, the wear resistance of the coating, the anti-adhesive performance of the coating surface, and the adhesion between the coating and the substrate surface will be even worse; The adhesion of Examples 1-3 of the present invention is above 53N, the contact angle is greater than 160°, and the wear rate is lower than 3.25×10 -5This shows that the water-based Teflon non-stick coating prepared by the present invention has high wear resistance and good anti-adhesion performance of the coating surface, and the coating has strong adhesion to the substrate surface.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A water-based Teflon non-stick coating, characterized in that: The invention comprises the following raw materials in percentage by weight: 1.5-2% thickener, 0.8-1.3% dimethylethanolamine, 2.5-4.2% pearl powder, 3-5% adhesion promoter, 25.3-31.3% deionized water, 1-2% carbon black, 0.4-1.2% wetting agent, 0.5-1% leveling agent, 1.8-2.3% wear-resistant powder, 1-5% hardener, and the balance is polytetrafluoroethylene emulsion.

2. The water-based Teflon non-stick coating according to claim 1, characterized in that: The thickener is hydroxyethyl cellulose, and the pearlescent powder is titanium dioxide.

3. The water-based Teflon non-stick coating according to claim 1, characterized in that: The adhesion promoter is acrylic acid metal salt, and the wetting agent is N,N'-dialkyl malic acid amide.

4. The water-based Teflon non-stick coating according to claim 1, characterized in that: The leveling agent is made of acrylate phosphate, and the wear-resistant powder is prepared by mixing ceramic powder and silicon carbide powder in a weight ratio of 1:1-1.

2.

5. The water-based Teflon non-stick coating according to claim 1, characterized in that: The hardener is hydrophobic nano-silicon dioxide.

6. A method for preparing a water-based Teflon non-stick coating according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Mix carbon black, wear-resistant powder and hardener and perform ultrasonic treatment for 0.5-1h; Step 2: placing the ultrasonically treated mixture in a cobalt source irradiation chamber for irradiation at a dose of 10-20 kGy for a treatment time of 10-15 seconds; Step 3: Mix the irradiated mixture with the remaining raw materials, and disperse them at a low speed of 100-300 r / min for 10-15 minutes to obtain a water-based Teflon non-stick coating.

7. The method for preparing the water-based Teflon non-stick coating according to claim 6, characterized in that: The ultrasonic processor responsible for ultrasonic treatment has a vibration frequency of 20-30kHz and a power of 600-900W.

8. The method for preparing the water-based Teflon non-stick coating according to claim 6, characterized in that: The usage of water-based Teflon non-stick coating is: The surface of the workpiece is cleaned, and after cleaning, the Teflon coating composition is evenly sprayed on the surface of the workpiece using plasma spraying equipment with a thickness of 10-25 microns. After drying, a water-based Teflon non-stick coating is formed.

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