Phosphorus-free degreasing powder for aluminum-iron-zinc co-tank and its preparation method and application

Abstract

The present invention provides a kind of fine washing phosphorus-free degreasing powder for aluminum-iron-zinc co-trough, and is made up of the following ingredients by weight percentage: lithium tartrate 10-13%, lithium salicylate 13-15%, lithium laurate 10-13%, aluminum acrylate 5-8%, aluminum acetate 15-20%, 2-phenoxy-2-phenylethanol 10-12%, cocamidopropyl betaine 8-10%, dodecyl betaine 8-10%, and surplus is sodium bicarbonate.The fine washing phosphorus-free degreasing powder of the present invention cleans materials such as aluminum-iron-zinc by ultrasonic or drum mode, and after cleaning, the dyne pen test of aluminum-iron-zinc surface is all greater than 44mN / m, and aluminum-zinc material is bright white as new, without excessive corrosion phenomenon, and has good performance matching with coating.

Description

Technical Field

[0001] The invention relates to the technical field of metal surface treatment, and in particular to a fine-washing phosphorus-free degreasing powder for an aluminum-iron-zinc common tank, a preparation method and an application thereof. Background Art

[0002] Currently, aluminum, iron, and zinc are widely used in degreasing and cleaning applications. This avoids redundant production lines, saving investment costs and plant equipment space. The degreasing mechanism involves the degreaser saponifying, solubilizing, wetting, dispersing, and emulsifying various types of oils and fats, thereby removing the oils and fats from the workpiece surface and converting them into soluble substances or emulsifying and dispersing them uniformly and stably within the bath. Iron surfaces are typically heavily contaminated with oil and dirt, making them difficult to clean. Aluminum surfaces are less contaminated with oil and have more release agent residue, making them prone to discoloration, yellowing, and blackening during cleaning. Zinc surfaces are heavily contaminated with oil and are prone to over-corrosion during cleaning, potentially resulting in a darkening effect. Especially for demanding degreasing applications, a dyne pen test force typically exceeds 44 mN / m. However, conventional degreasers and degreasing powders on the market often exhibit various issues, such as incomplete oil removal, discoloration and blackening of aluminum, and over-corrosion and darkening of zinc. Summary of the Invention

[0003] The purpose of the present invention is to provide a phosphorus-free degreasing powder for fine washing of aluminum, iron and zinc in a common tank, as well as a preparation method and application. After cleaning with the phosphorus-free degreasing powder, the dyne pen test on the surface of the aluminum, iron and zinc is greater than 44mN / m, and the aluminum-zinc material is white and bright as new without excessive corrosion, and has good performance matching with the coating.

[0004] The present invention provides a phosphorus-free degreasing powder for fine washing in an aluminum-iron-zinc common tank, which is prepared from the following components by weight percentage:

[0005] Lithium tartrate 10-13%,

[0006] Lithium salicylate 13-15%,

[0007] Lithium laurate 10-13%,

[0008] Aluminum acrylic acid 5-8%,

[0009] Aluminum acetate 15-20%,

[0010] 2-phenoxy-2-phenylethanol 10-12%,

[0011] Cocamidopropyl Betaine 8-10%,

[0012] Dodecyl betaine 8-10%,

[0013] Sodium bicarbonate balance.

[0014] The preparation method of the fine-washed phosphorus-free degreased powder for aluminum, iron and zinc co-tanks of the present invention is as follows:

[0015] Lithium tartrate, lithium salicylate, lithium laurate, aluminum acrylate, aluminum acetate, 2-phenoxy-2-phenylethanol, cocamidopropyl betaine, lauryl betaine, and sodium bicarbonate are added to a high-speed mixer in sequence, stirred for 1-2 hours, and then transferred to a solid powder dryer for drying for 1-2 hours to obtain phosphorus-free defatted powder.

[0016] The weight ratio of aluminum acrylate to aluminum acetate is 1:(2-4). If this ratio is too small, the amount of aluminum acrylate used will be too low, resulting in reduced degreasing and degreasing capabilities. If this ratio is too large, the amount of aluminum acrylate used will be too high, causing the active ingredients in the degreasing solution to settle, affecting degreasing effectiveness.

[0017] The present invention provides a method for using a fine-washing phosphorus-free degreasing powder for an aluminum-iron-zinc common tank as follows:

[0018] Add phosphorus-free defatted powder to water in a weight ratio of 1: (15-20), the treatment temperature is 50-60℃, the treatment method is ultrasonic or roller, and the metal workpiece is placed in it for 5-10 minutes.

[0019] The power of the ultrasonic wave is 3-5KW, and the frequency is 28-40KHZ.

[0020] Lithium tartrate has the function of separating oil stains, lithium salicylate has the function of wetting and penetrating, and lithium laurate has the function of dispersing. These three lithium salts have a synergistic effect in oil removal and corrosion prevention. Aluminum acrylate has the function of wrapping oil stains, aluminum acetate has the function of flocculation, 2-phenoxy-2-phenylethanol has the function of corrosion inhibition, cocamidopropyl betaine and dodecyl betaine have the function of emulsification, and sodium bicarbonate is an alkaline substance that provides an alkaline environment. Under the wetting and penetration of lithium salicylate, cocamidopropyl betaine and dodecyl betaine emulsify the agglomerated oil into small oil molecules. Aluminum acrylate completely wraps the small oil molecules. Aluminum acetate flocculates the wrapped small oil molecules into large molecular oil flocs. Due to the roll-off effect of lithium tartrate and the instability of the large molecular oil flocs themselves, the large molecular oil flocs detach from the metal surface and enter the degreasing solution. Lithium laurate finally disperses the large molecular oil flocs into small molecules that dissolve in the degreasing solution. 2-phenoxy-2-phenylethanol can form an isolation film on the metal surface to prevent hydroxide ions from corroding active metals such as aluminum and zinc.

[0021] The beneficial effects of the present invention are as follows:

[0022] The present invention cleans aluminum, iron, zinc and other materials by ultrasonic or drum method. After cleaning, the dyne pen test of the aluminum, iron and zinc surfaces is greater than 44mN / m, and the aluminum and zinc materials are bright white as new without excessive corrosion, and have good matching performance with the coating. Implementation Method

[0023] The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0024] Table 1 is the formula of Examples 1-5, Table 2 is the formula of Comparative Examples 1-6, and Table 3 is the formula of Comparative Examples 7-12, which are as follows:

[0025] Table 1 (preparation 1 kg)

[0026] Example 1 Example 2 Example 3 Example 4 Example 5 lithium tartrate 100g 105g 110g 120g 130g lithium salicylate 130g 135g 140g 145g 150g Lithium laurate 100g 110g 120g 125g 130g Acrylic Aluminum 50g 60g 70g 75g 80g Aluminum acetate 150g 160g 170g 180g 200g 2-Phenoxy-2-phenylethanol 100g 105g 110g 115g 120g Cocamidopropyl Betaine 80g 85g 90g 95g 100g Lauryl Betaine 80g 85g 90g 95g 100g Sodium bicarbonate margin margin margin margin margin

[0027] Table 2 (preparation 1 kg)

[0028] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 lithium tartrate - 105g 110g 120g 130g 130g lithium salicylate 130g - 140g 145g 150g 150g Lithium laurate 100g 110g - 125g 130g 130g Acrylic Aluminum 50g 60g 70g - 80g 80g Aluminum acetate 150g 160g 170g 180g - 200g 2-Phenoxy-2-phenylethanol 100g 105g 110g 115g 120g - Cocamidopropyl Betaine 80g 85g 90g 95g 100g 100g Lauryl Betaine 80g 85g 90g 95g 100g 100g Sodium bicarbonate margin margin margin margin margin margin

[0029] Table 3 (preparation 1 kg)

[0030] Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Comparative Example 11 Comparative Example 12 lithium tartrate 130g 130g 100g 350g 0 0 lithium salicylate 150g 150g 130g 0 350g 0 Lithium laurate 130g 130g 100g 0 0 350g Acrylic Aluminum 80g 80g 150g 60g 60g 60g Aluminum acetate 200g 200g 50g 160g 160g 160g 2-Phenoxy-2-phenylethanol 120g 120g 100g 105g 105g 105g Cocamidopropyl Betaine - 100g 80g 85g 85g 85g Lauryl Betaine 100g - 80g 85g 85g 85g Sodium bicarbonate margin margin margin margin margin margin

[0031] In Comparative Example 9, the amounts of aluminum acrylate and aluminum acetate are swapped, and the other conditions are the same as in Example 1; in Comparative Example 10, the amount of lithium tartrate is the total amount of lithium tartrate, lithium salicylate, and lithium laurate in Example 2, excluding lithium salicylate and lithium laurate, and the other conditions are the same as in Example 2; in Comparative Example 11, the amount of lithium salicylate is the total amount of lithium tartrate, lithium salicylate, and lithium laurate in Example 2, excluding lithium tartrate and lithium laurate, and the other conditions are the same as in Example 2; in Comparative Example 12, the amount of lithium laurate is the total amount of lithium tartrate, lithium salicylate, and lithium laurate in Example 2, excluding lithium salicylate and lithium tartrate, and the other conditions are the same as in Example 2.

[0032] The method for using the fine-washing phosphorus-free degreasing powder for the aluminum-iron-zinc common tank in the embodiments of the present invention and the comparative examples is as follows:

[0033] Add water to the phosphorus-free defatted powder at a ratio of 1:19, set the treatment temperature at 55-60°C, use ultrasonic treatment, the ultrasonic power is 5KW, the frequency is 40KHZ, and place the powder in the treatment chamber for 7 minutes.

[0034] The test results of Examples 1-5 are shown in Table 4, the test results of Comparative Examples 1-6 are shown in Table 5, and the test results of Comparative Examples 7-12 are shown in Table 6.

[0035] Table 4

[0036] Example 1 Example 2 Example 3 Example 4 Example 5 Iron parts degreasing effect 44# Dyne pen test, no shrinkage 44# Dyne pen test, no shrinkage 44# Dyne pen test, no shrinkage 44# Dyne pen test, no shrinkage 44# Dyne pen test, no shrinkage Degreasing effect of aluminum castings 44# Dyne pen test, no shrinkage, no blackening, no discoloration 44# Dyne pen test, no shrinkage, no blackening, no discoloration 44# Dyne pen test, no shrinkage, no blackening, no discoloration 44# Dyne pen test, no shrinkage, no blackening, no discoloration 44# Dyne pen test, no shrinkage, no blackening, no discoloration Degreasing effect of galvanized parts 44# Dyne pen test, no shrinkage, no blackening, no discoloration 44# Dyne pen test, no shrinkage, no blackening, no discoloration 44# Dyne pen test, no shrinkage, no blackening, no discoloration 44# Dyne pen test, no shrinkage, no blackening, no discoloration 44# Dyne pen test, no shrinkage, no blackening, no discoloration Amount of artificial oil pollution before iron cleaning 2000mg / ㎡ 2000mg / ㎡ 2000mg / ㎡ 2000mg / ㎡ 2000mg / ㎡ Amount of oil stains on iron parts after cleaning 2mg / ㎡ 2mg / ㎡ 2mg / ㎡ 2mg / ㎡ 2mg / ㎡ Phosphorus content of the product 0mg / l 0mg / l 0mg / l 0mg / l 0mg / l Surface cleanliness <10 mg <10 mg <10 mg <10 mg <10 mg Corrosive to metals No corrosion No corrosion No corrosion No corrosion No corrosion Rinse performance Easy to rinse, no residue Easy to rinse, no residue Easy to rinse, no residue Easy to rinse, no residue Easy to rinse, no residue

[0037] Table 5

[0038] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Iron parts degreasing effect 44# Dyne pen test, severe shrinkage 44# Dyne pen test, severe shrinkage 44# Dyne pen test, severe shrinkage 44# Dyne pen test, severe shrinkage 44# Dyne pen test, severe shrinkage 44# Dyne pen test, severe shrinkage Aluminum parts degreasing effect 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface Degreasing effect of galvanized parts 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface Amount of artificial oil pollution before iron cleaning 2000mg / ㎡ 2000mg / ㎡ 2000mg / ㎡ 2000mg / ㎡ 2000mg / ㎡ 2000mg / ㎡ Amount of oil stains on iron parts after cleaning 332mg / ㎡ 460mg / ㎡ 369mg / ㎡ 421mg / ㎡ 423mg / ㎡ 416mg / ㎡ Phosphorus content of the product 0mg / l 0mg / l 0mg / l 0mg / l 0mg / l 0mg / l Surface cleanliness 160mg 165mg 189mg 153mg 173mg 159mg Corrosive to metals corrosion corrosion corrosion corrosion corrosion corrosion Rinse performance Easy to rinse, no residue Easy to rinse, no residue Easy to rinse, no residue Easy to rinse, no residue Easy to rinse, no residue Easy to rinse, no residue

[0039] Table 6

[0040] Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Comparative Example 11 Comparative Example 12 Iron parts degreasing effect 44# Dyne pen test, severe shrinkage 44# Dyne pen test, severe shrinkage 44# Dyne pen test, severe shrinkage 44# Dyne pen test, severe shrinkage 44# Dyne pen test, severe shrinkage 44# Dyne pen test, severe shrinkage Aluminum parts degreasing effect 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface Degreasing effect of galvanized parts 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface 44# Dyne pen test, severe shrinkage; black surface Amount of artificial oil pollution before iron cleaning 2000mg / ㎡ 2000mg / ㎡ 2000mg / ㎡ 2000mg / ㎡ 2000mg / ㎡ 2000mg / ㎡ Amount of oil stains on iron parts after cleaning 523mg / ㎡ 512mg / ㎡ 546mg / ㎡ 489mg / ㎡ 413mg / ㎡ 422mg / ㎡ Phosphorus content of the product 0mg / l 0mg / l 0mg / l 0mg / l 0mg / l 0mg / l Surface cleanliness 181mg 203mg 123mg 133mg 208mg 196mg Corrosive to metals corrosion corrosion corrosion corrosion corrosion corrosion Rinse performance Easy to rinse, no residue Easy to rinse, no residue Easy to rinse, no residue Easy to rinse, no residue Easy to rinse, no residue Easy to rinse, no residue

[0041] From the test data of Example 1 in Table 4 and Comparative Examples 10-12 in Table 6, it can be seen that lithium tartrate, lithium salicylate and lithium laurate have a synergistic effect.

[0042] The test methods for each item in Table 4-6 are as follows:

[0043] Test items Test Method Iron parts degreasing effect 44# Dyne Pen Test Aluminum parts degreasing effect 44# Dyne Pen Test Degreasing effect of galvanized parts 44# Dyne Pen Test Oil pollution analysis Weigh the difference in mass before and after cleaning using a 1 / 10,000 electronic analytical balance Phosphorus content of the product COD ammonia nitrogen total phosphorus total nitrogen tester Surface cleanliness Mass method: Use tetrachloroethylene to clean the surface to be tested, dissolve the oil and grease on the surface in the solvent, then heat the cleaning liquid (tetrachloroethylene) to evaporate it, and obtain the residual oil content. Corrosive to metals Weighing method, mass change before and after degreasing Rinse performance Observational method

Claims

1. A phosphorus-free degreasing powder for fine washing of aluminum, iron and zinc tanks, characterized in that: The invention is prepared from the following ingredients by weight percentage: 10-13% lithium tartrate, 13-15% lithium salicylate, 10-13% lithium laurate, 5-8% aluminum acrylate, 15-20% aluminum acetate, 10-12% 2-phenoxy-2-phenylethanol, 8-10% cocamidopropyl betaine, 8-10% lauryl betaine, and the balance is sodium bicarbonate; The weight ratio of the aluminum acrylate to the aluminum acetate is 1:(2-4).

2. The method for preparing the finely washed phosphorus-free defatted powder for the aluminum-iron-zinc common tank according to claim 1, characterized in that: The steps include: Add lithium tartrate, lithium salicylate, lithium laurate, aluminum acrylate, aluminum acetate, 2-phenoxy-2-phenylethanol, cocamidopropyl betaine, lauryl betaine and sodium bicarbonate in sequence, stir for 1-2 hours, transfer to a solid powder dryer and dry for 1-2 hours to obtain phosphorus-free defatted powder.

3. The method for using the fine-washing phosphorus-free degreasing powder for aluminum-iron-zinc common tank according to claim 1, characterized in that: The following steps are included in sequence: Add phosphorus-free defatted powder to water at a weight ratio of 1: (15-20), the treatment temperature is 50-60℃, the treatment method is ultrasonic or roller, and the metal workpiece is placed in it for 5-10 minutes.

4. The method for using the fine-washing phosphorus-free degreasing powder for aluminum-iron-zinc common tank according to claim 3, characterized in that: The power of the ultrasonic wave is 3-5KW, and the frequency is 28-40KHZ.