A non-passivation film-damaging stainless steel article cleaner and a method for preparing the same

Abstract

The application discloses a stainless steel article cleaning agent without damaging the passivation film and a preparation method thereof. The cleaning agent comprises, in terms of mass fractions, 4-10 parts of non-ionic surfactant, 2-6 parts of amphoteric surfactant, 1-4 parts of chelating agent, 1-3 parts of polishing aid, 0.3-1.2 parts of corrosion inhibitor and film protector, 0.2-0.8 parts of brightener, 0.05-0.2 parts of essence, and deionized water, and the total is 100 parts. The mild surfactant compound system is adopted, the pH value is near neutral, and the cleaning agent does not contain chloride ions and strong acid and strong base. The cleaning agent can efficiently remove stains such as oil stains, water stains and fingerprints on the surface of the stainless steel, and the cleaning rate is more than 98%. Meanwhile, the passivation film of the stainless steel is not damaged, the nano polishing component and the film protector are synergistically used, slight scratches are repaired, and a fingerprint protection film is formed. After cleaning, the stainless steel is bright and durable, and the cleaning agent is suitable for cleaning and maintenance of various stainless steel kitchen utensils, elevators, medical devices and the like.

Description

Technical Field

[0001] This invention belongs to the field of metal cleaning technology, specifically relating to a stainless steel cleaning agent that does not damage the passivation film and its preparation method. Background Technology

[0002] Stainless steel products are widely used in kitchen equipment, medical devices, elevators, tableware, and other applications. During use, their surfaces are easily stained with oil, limescale, fingerprints, dust, and other contaminants. Traditional stainless steel cleaners often contain strong acids, strong alkalis, or chloride ions. While these have strong cleaning power, they can damage the passivation film on the stainless steel surface, causing it to lose its rust-resistant properties. Over time, this can lead to problems such as loss of shine, discoloration, and rusting.

[0003] Existing mild stainless steel cleaners generally suffer from insufficient cleaning power, inability to remove stubborn limescale and oxide spots, and a tendency to leave watermarks after cleaning. Therefore, developing a stainless steel cleaner that has strong cleaning power, does not damage the passivation film, and also provides a brightening and protective effect has significant market value. Summary of the Invention

[0004] Purpose of the invention The purpose of this invention is to provide a stainless steel cleaning agent that does not damage the passivation film and its preparation method. While effectively removing various stains, it does not damage the stainless steel passivation film and can form a protective film layer on the surface, thus having the triple effects of cleaning, brightening, and rust prevention. Technical solution To achieve the above objectives, the present invention adopts the following technical solution: A stainless steel cleaning agent that does not damage the passivation film comprises the following components by weight: 4-10 parts nonionic surfactant, 2-6 parts amphoteric surfactant, 1-4 parts chelating agent, 1-3 parts polishing aid, 0.3-1.2 parts corrosion inhibitor and protective film agent, 0.2-0.8 parts brightener, 0.05-0.2 parts fragrance, and deionized water to make up to 100 parts. Furthermore, the nonionic surfactant is a mixture of alkyl glycoside APG0810 and cocamidopropylamine oxide in a mass ratio of 2:1. Furthermore, the amphoteric surfactant is cocamidopropyl betaine. Furthermore, the chelating agent is sodium gluconate, and the polishing aid is a nano-silica dispersion with a particle size of 20-50 nm. Furthermore, the corrosion inhibitor is a benzotriazole derivative, and the brightener is a water-soluble silicone oil. Preferably, the benzotriazole derivative is selected from at least one of benzotriazole (BTA), methylbenzotriazole (TTA), or 5-chlorobenzotriazole. Preferably, the water-soluble silicone oil is a polyether-modified silicone oil with a viscosity of 100–500 mPa·s. Preferably, the fragrance is lemon fragrance or lavender fragrance. The preparation method of the above-mentioned stainless steel cleaning agent that does not damage the passivation film includes the following steps: (1) Add the prescribed amount of deionized water to the reactor, add the chelating agent at room temperature, and stir until completely dissolved; (2) Add nonionic surfactant, amphoteric surfactant and corrosion inhibitor in sequence, and stir for 15-20 minutes until uniform and transparent; (3) Slowly add polishing aid and brightener, and stir at low speed for 10-15 minutes; (4) Add flavoring, stir well and then filter out the material. Beneficial effects 1. Mild and non-corrosive: The product has a pH value of 7-8, which is close to neutral. It does not contain chloride ions, strong acids, or strong alkalis. It does not damage the passivation film of stainless steel during the cleaning process, and long-term use will not cause stainless steel to lose its luster or rust. 2. Comprehensive stain removal: It can effectively remove oil stains, limescale, fingerprints, light oxidation spots and dust from stainless steel surfaces. It has a cleaning rate of over 98% for common stains such as heavy kitchen oil stains and elevator fingerprints, without leaving watermarks. 3. Glossy Protective Film: Nano-polishing components can repair minor surface scratches and enhance gloss; corrosion-inhibiting protective film forms an ultra-thin protective film on the surface, which has anti-fingerprint and anti-recontamination effects, and the gloss is long-lasting after cleaning. 4. Wide range of applications: Suitable for kitchenware, elevators, medical devices, bathroom products and other products made of various stainless steel materials such as 304 and 316, safe and non-irritating. Detailed Implementation The present invention will be further described in detail below with reference to specific embodiments, but the scope of protection of the present invention is not limited to these embodiments. Example 1 A stainless steel cleaning agent that does not damage the passivation film, comprising, by weight: 4 parts APG0810, 2 parts cocamidopropylamine oxide, 3 parts cocamidopropyl betaine, 2 parts sodium gluconate, 1.5 parts nano silica dispersion (particle size 30nm), 0.5 parts methylbenzotriazole, 0.3 parts polyether modified silicone oil, 0.1 parts lemon fragrance, and deionized water to make up to 100 parts. Preparation method: (1) Add deionized water to the reaction vessel, add sodium gluconate at room temperature, and stir until completely dissolved; (2) Add APG0810, cocamidopropylamine oxide, cocamidopropyl betaine and methylbenzotriazole in sequence, and stir at 200 r / min for 18 min until uniform and transparent; (3) Slowly add the nano silica dispersion and polyether modified silicone oil, and stir at a low speed of 150 r / min for 12 min; (4) Add lemon flavoring, stir well, and then filter the material through a 200-mesh filter. Example 2 A stainless steel cleaning agent that does not damage the passivation film, comprising, by weight: 6 parts APG0810, 3 parts cocamidopropylamine oxide, 4 parts cocamidopropyl betaine, 3 parts sodium gluconate, 2 parts nano silica dispersion (particle size 25nm), 0.8 parts benzotriazole, 0.5 parts polyether modified silicone oil, 0.15 parts lemon fragrance, and deionized water to make up to 100 parts. The preparation method is the same as in Example 1, wherein the stirring speed in step (2) is 200 r / min and the stirring time is 18 min; and the stirring speed in step (3) is 150 r / min and the stirring time is 12 min. Comparative Example 1 An acidic stainless steel cleaner, by weight parts, comprises: 5 parts citric acid, 0.5 parts sodium chloride, 2 parts sodium dodecylbenzenesulfonate, and deionized water to a total of 100 parts. This comparative example is used to simulate commercially available stainless steel cleaners containing acid and chloride ions. Performance testing Take a 304 stainless steel sample (50mm×50mm, surface finish Ra≤0.4μm) and perform the following tests: 1. pH value test: The pH value of the cleaning agent shall be determined at 25°C in accordance with the method specified in GB / T 6368. 2. Oil Stain Cleaning Rate Test: Artificial oil (a mixture of 10g vegetable oil, 10g animal oil, 5g stearic acid, 5g kaolin, and 20g deionized water) was evenly coated onto the surface of the test piece. It was dried at 105℃ for 1 hour, and the weight was recorded as W1. The cleaning agent was diluted 10 times, and the test piece was wiped with a non-woven cloth for 1 minute. It was then rinsed with deionized water, dried at 105℃ for 1 hour, and the weight was recorded as W2. The original weight of the test piece was recorded as W0. Oil stain cleaning rate = (W1-W2) / (W1-W0) × 100%. Each sample was tested 3 times, and the average value was taken. 3. Scale Removal Rate Test: Immerse the test piece in hard water (calculated as CaCO3) with a hardness of 500 mg / L and maintain the temperature at 80℃ for 24 hours. Remove and dry, weigh the surface after scale deposition, and record the weight as M1. Wipe with detergent for 1 minute, rinse with deionized water, dry at 105℃, and weigh again as M2. Record the original weight of the test piece as M0. Scale removal rate = (M1-M2) / (M1-M0)×100%. Test each sample three times and take the average value. 4. Passivation film integrity test: The copper sulfate drop method is used. A 6% copper sulfate solution is dropped onto the cleaned test piece surface, and the surface is observed for 30 seconds to see if red copper precipitation occurs. No red precipitation and no corrosion spots on the surface are considered "intact and undamaged"; the appearance of red precipitation or corrosion spots is considered "significant damage". 5. Appearance test with 100 consecutive wipes: Apply undiluted cleaning agent to the non-woven fabric and wipe the same test piece surface 100 times in the same direction. Observe the change in surface gloss under a standard light source D65. 6. Anti-fingerprint effect test: Gently touch the cleaned test surface with your finger and visually observe the fingerprint residue under a standard light source D65. No obvious fingerprint residue is judged as "excellent"; slight traces that can be wiped off are judged as "good"; obvious fingerprint residue is judged as "none".

Claims

1. A stainless steel cleaning agent that does not damage the passivation film, characterized in that, By weight, it includes the following components: 4-10 parts nonionic surfactant, 2-6 parts amphoteric surfactant, 1-4 parts chelating agent, 1-3 parts polishing aid, 0.3-1.2 parts corrosion inhibitor and protective film agent, 0.2-0.8 parts brightener, 0.05-0.2 parts fragrance, and deionized water to make up to 100 parts.

2. The stainless steel cleaning agent that does not damage the passivation film according to claim 1, characterized in that, The nonionic surfactant is a mixture of alkyl glycoside APG0810 and cocamidopropylamine oxide in a mass ratio of 2:

1.

3. The stainless steel cleaning agent that does not damage the passivation film according to claim 1, characterized in that, The amphoteric surfactant is cocamidopropyl betaine.

4. The stainless steel cleaning agent that does not damage the passivation film according to claim 1, characterized in that, The chelating agent is sodium gluconate, and the polishing aid is a nano-silica dispersion with a particle size of 20-50 nm.

5. The stainless steel cleaning agent that does not damage the passivation film according to claim 1, characterized in that, The corrosion inhibitor is a benzotriazole derivative, and the brightener is a water-soluble silicone oil.

6. The stainless steel cleaning agent that does not damage the passivation film according to claim 5, characterized in that, The benzotriazole derivative is selected from at least one of benzotriazole, methylbenzotriazole or 5-chlorobenzotriazole.

7. The stainless steel cleaning agent that does not damage the passivation film according to claim 5, characterized in that, The water-soluble silicone oil is a polyether-modified silicone oil with a viscosity of 100–500 mPa·s.

8. A method for preparing a stainless steel cleaning agent that does not damage the passivation film as described in any one of claims 1-7, characterized in that, Includes the following steps: (1) Add the prescribed amount of deionized water to the reactor, add the chelating agent at room temperature, and stir until completely dissolved; (2) Add nonionic surfactant, amphoteric surfactant and corrosion inhibitor in sequence, and stir for 15-20 minutes until uniform and transparent; (3) Slowly add polishing aid and brightener, and stir at low speed for 10-15 minutes; (4) Add flavoring, stir well and then filter out the material.

9. The preparation method according to claim 8, characterized in that, The stirring speed in step (2) is 150-250 r / min.

10. The preparation method according to claim 8, characterized in that, The low-speed stirring speed mentioned in step (3) is 100-150 r / min.