A coating agent for metal product drawing and its production method and application

Abstract

The application discloses a coating agent for metal product drawing and a production method and application thereof, wherein the coating agent is composed of the following components in parts by weight: sodium phytate 18-27 parts, aluminum oxide 18-27 parts, organic silicon 18-27 parts, sodium tripolyphosphate 18-27 parts, tungsten disulfide 0.4-6 parts and sodium hydroxide 4-12 parts; the coating agent can form a coating liquid by dissolving in water. Compared with the existing phosphating and saponification treatment process, the coating agent is used for surface treatment of the metal product before drawing, no slag is generated in the production process, no waste gas is generated, no water washing is needed, no saponification is needed, energy saving, environmental protection and green industrial production are achieved, and the generation of polluting waste is eliminated; the steps of the coating agent used for surface treatment of the metal product before drawing are relatively simple, production efficiency is high, and production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of surface treatment of metal products before drawing, and in particular to a coating agent used for drawing metal products, a production method and application thereof. Background Art

[0002] In order to meet the production requirements of high-speed drawing of metal products, metal product manufacturers need to pre-treat the metal products and form a coating layer on the surface of the metal products. Currently, before the production of metal product drawing, traditional polluting phosphating liquid is often used for phosphating, and saponification is used for pre-drawing treatment to form a phosphate film on the surface of the metal products. Among them, the main production process of pre-drawing treatment is: phosphating + water washing + hot water treatment + saponification + drying. During this production process, the phosphating liquid will produce NO and NO2 gases, as well as chemical hazardous waste residues containing heavy metals and oxidizing properties. After the product is phosphated, it will be washed with water, resulting in a large amount of wastewater. After phosphating, it will be subjected to saponification, and the COD (organic pollutants) in the saponification tank will also exceed the standard. During the use of phosphating and saponification, it will cause great pollution to the environment and generate a large amount of three wastes. These polluting wastes need to be professionally collected and treated to avoid polluting the environment.

[0003] The above-mentioned treatment process is relatively complicated, with low production efficiency and high environmental treatment costs required to dispose of the three wastes, which increases production costs. Therefore, it is necessary to improve it to meet the surface treatment requirements of metal products before drawing while eliminating the generation of polluting waste. Summary of the Invention

[0004] The object of the present invention is to provide a coating agent for drawing metal products, which can be used for surface treatment of metal products before drawing and eliminate the generation of polluting waste.

[0005] The present invention also provides a method for producing the coating agent for drawing metal products and its application in pre-drawing treatment of metal products.

[0006] To achieve the above-mentioned purpose, a coating agent for drawing metal products is provided, which is composed of the following components, calculated by weight: 18-27 parts of sodium phytate, 18-27 parts of aluminum oxide, 18-27 parts of silicone, 18-27 parts of sodium tripolyphosphate, 0.4-6 parts of tungsten disulfide, and 4-12 parts of sodium hydroxide; the coating agent can be dissolved in water to form a coating liquid.

[0007] According to the coating agent for drawing metal products, it is composed of the following components in parts by weight: 20-25 parts of sodium phytate, 20-25 parts of aluminum oxide, 20-25 parts of organic silicon, 20-25 parts of sodium tripolyphosphate, 0.5-5 parts of tungsten disulfide, and 5-10 parts of sodium hydroxide.

[0008] According to the coating agent for drawing metal products, it is composed of the following components in parts by weight: 22 parts of sodium phytate, 22 parts of aluminum oxide, 22 parts of organic silicon, 22 parts of sodium tripolyphosphate, 1 part of tungsten disulfide, and 8 parts of sodium hydroxide.

[0009] The method for producing a coating agent for drawing metal products comprises the following steps:

[0010] S1. Weigh the raw materials of each component of the coating agent according to the weight ratio;

[0011] S2. Put the above raw materials into a grinder respectively, grind and sieve them, then put them into a stirring kettle, and stir them evenly to obtain the coating agent.

[0012] The application of the coating agent for drawing metal products in the pre-drawing treatment of metal products comprises the following steps:

[0013] S1. Weigh the coating agent and dissolve it in hot water according to a set weight ratio to obtain a coating solution;

[0014] S2. Maintaining the temperature of the coating liquid, immersing the metal product in the coating liquid and then lifting it out of the liquid; or, maintaining the temperature of the coating liquid, spraying the coating liquid on the surface of the metal product;

[0015] S3. Wait until the surface of the metal product is dry;

[0016] Among them, sodium phytate forms an integrated compound with the metal. Phytate has a hexagonal ring structure. The terminal sodium ions are replaced with iron ions, aluminum ions, and Si under the catalytic action of the catalyst in the alkaline coating liquid to form a phytate iron, Si, and aluminum composite metal coating layer that meets the high-speed drawing requirements of metal products.

[0017] According to the application of the coating agent for metal product drawing in the pre-treatment of metal product drawing, in step S1, the temperature of the hot water is 65-80°C.

[0018] According to the application of the coating agent for drawing metal products in the pre-drawing treatment of metal products, the weight proportion of the coating agent in the coating solution is 15%-25%.

[0019] According to the application of the coating agent for metal product drawing in the pre-treatment of metal product drawing, in step S2, the temperature of the coating liquid is maintained at 65-80°C.

[0020] According to the application of the coating agent for drawing metal products in the pre-drawing treatment of metal products, in step S3, the surface of the metal product is dried by natural drying.

[0021] The catalyst is oxygen blown into the coating liquid, and the catalyst is oxygen filled into the coating liquid.

[0022] The process of using the coating agent of the present invention to treat the surface of metal products before drawing is: coating or soaking (coating the coating liquid on the surface of the metal products) + natural drying (no three wastes).

[0023] Working principle: Sodium phytate forms a strong integrated compound with metal. Phytate has a hexagonal ring structure. The terminal sodium ions are replaced with iron ions, aluminum ions, and Si under the catalytic action of the catalyst in the alkaline coating liquid to form a stable, firm and wear-resistant phytate iron, Si, and aluminum composite metal coating layer that meets the high-speed drawing requirements of metal products.

[0024] Beneficial effects:

[0025] Compared with the existing phosphating and saponification treatment processes, the coating agent of the present invention is used to treat the surface of metal products before drawing. In the production process, no slag is generated, no waste gas is generated, no water washing is required, and no saponification is required, thereby achieving energy-saving, environmentally friendly, green industrial production and eliminating the generation of polluting waste.

[0026] The process of applying the coating agent of the present invention to the surface treatment of metal products before drawing is relatively simple, the production efficiency is high, and the production cost is reduced;

[0027] The chemical film formed on the surface of metal products has stronger metal corrosion resistance compared with the existing metal phosphate film;

[0028] After the coating agent of the present invention is used to treat the surface of metal products, the prestressed steel strands produced therefrom have strong bonding strength with cement.

[0029] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0031] Figure 1 A diagram showing the application steps of a coating agent used for drawing metal products before the drawing of metal products;

[0032] Figure 2 This is a picture of the corrosion resistance of the comparative sample in the salt spray test;

[0033] Figure 3 The following is a picture showing the corrosion resistance of an embodiment of the present invention in a salt spray test. DETAILED DESCRIPTION

[0034] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0035] In the description of this invention, terms such as "greater than," "less than," and "exceed" are understood to exclude the number itself, while terms such as "above," "below," and "within" are understood to include the number itself. The use of terms such as "first" and "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0036] Example:

[0037] The coating agent of the present invention is composed of the following raw materials: sodium phytate, aluminum oxide, organosilicon, sodium tripolyphosphate, tungsten disulfide, and sodium hydroxide. During the production of the coating agent, the raw materials are weighed according to weight percentage. The specific raw material ratios are shown in Table 1.

[0038] Table 1 Raw material ratio table (weight parts)

[0039]

[0040] The raw materials in the examples are respectively placed in a grinder, ground by the grinder, and then sieved. The sieved powder is placed in a stirring kettle and stirred evenly to obtain the coating agent. The above coating agent can be dissolved in water to form a coating liquid. Preferably, the coating agent is dissolved in hot water.

[0041] When the coating agent is used in the pre-drawing treatment of metal products, the following steps are adopted:

[0042] S1. Weigh the coating agent and dissolve it in hot water according to a set weight ratio to obtain a coating solution;

[0043] S2. Maintaining the temperature of the coating liquid, immersing the metal product in the coating liquid and then lifting it out of the liquid; or, maintaining the temperature of the coating liquid, spraying the coating liquid on the surface of the metal product;

[0044] S3. After the surface of the metal product is dried, a wear-resistant and extensible chemical film is formed which is firmly bonded to the metal body, fully meeting the production needs of metal product drawing, and the chemical film has a good anti-corrosion effect.

[0045] In step S1, the temperature of the hot water is 65-80°C, and in step S2, the temperature of the coating liquid is maintained at 65-80°C. For example, the coating agent is dissolved in hot water at a temperature of 70°C, and the resulting coating liquid is placed in a heatable and heat-insulating container to maintain its liquid temperature at 70°C for immersion and spraying of the metal product.

[0046] Furthermore, in step S2, oxygen is injected into the coating liquid as a catalyst to assist in forming a chemical film on the metal surface. Specifically, when the metal product is immersed in the coating liquid, oxygen can be injected directly into the coating liquid contained in the container. When spraying the coating liquid, the nozzle used to spray the metal product surface is connected to the container via a pipe, and oxygen can be injected into the container, pipe, or nozzle, thereby filling the coating liquid with oxygen.

[0047] The coating agent accounts for 15% to 25% by weight of the coating liquid to ensure that the chemical film on the surface of the metal product has an appropriate thickness. In addition, in step S3, the surface of the metal product is dried by air drying to allow the coating liquid and the metal product surface to react for sufficient time to form a chemical film.

[0048] In the present invention, the coating agent and coating liquid can be used for the drawing production of metal products such as steel wire.

[0049] When using the coating agent of the present invention to treat the surface of a metal product before drawing, the pre-treated metal product is first coated with the coating liquid by immersion or spraying. The metal product is then moved to another location and allowed to dry naturally for a period of time to form a chemical film. Finally, the metal product can be moved to the drawing equipment for production. The surface treatment process of the metal product is simple, significantly improving production efficiency, and without generating waste residue, wastewater, or waste gas, thus being highly environmentally friendly.

[0050] Compared to existing metal surface phosphate coatings, the chemical film formed on the metal surface by the coating agent of the present invention has a better corrosion protection effect. Taking the coating agent Example 3 as an example, the chemical film formed on the steel wire surface with a coating solution containing 20% ​​by weight of the coating agent is tested in salt spray tests as follows.

[0051] Table 2 Comparison of salt spray test between phosphate coating and chemical coating on steel wire surface

[0052]

[0053] In addition, the prestressed steel strand produced by the chemical film of the present invention has a strong bond strength with cement and has good construction performance.

[0054] Table 3 Bonding strength test of steel strands for prestressed concrete

[0055]

[0056] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the scope of the present invention.

Claims

1. A coating agent for drawing metal products, characterized in that: In parts by weight, it is composed of the following components: 18-27 parts of sodium phytate, 18-27 parts of aluminum oxide, 18-27 parts of organosilicon, 18-27 parts of sodium tripolyphosphate, 0.4-6 parts of tungsten disulfide, and 4-12 parts of sodium hydroxide; The coating agent can be dissolved in water to form a coating solution.

2. A coating agent for drawing metal products according to claim 1, characterized in that: In parts by weight, it is composed of the following components: 20-25 parts of sodium phytate, 20-25 parts of aluminum oxide, 20-25 parts of organosilicon, 20-25 parts of sodium tripolyphosphate, 0.5-5 parts of tungsten disulfide, and 5-10 parts of sodium hydroxide.

3. The coating agent for drawing metal products according to claim 2, characterized in that: In parts by weight, it is composed of the following components: 22 parts of sodium phytate, 22 parts of aluminum oxide, 22 parts of organic silicon, 22 parts of sodium tripolyphosphate, 1 part of tungsten disulfide, and 8 parts of sodium hydroxide.

4. The method for producing a coating agent for drawing metal products according to any one of claims 1 to 3, characterized in that: The steps include: S1. Weigh the raw materials of each component of the coating agent according to the weight ratio; S2. Put the above raw materials into a grinder respectively, grind and sieve them, then put them into a stirring kettle, and stir them evenly to obtain the coating agent.

5. Use of the coating agent for drawing metal products according to any one of claims 1 to 3 in the pre-treatment of metal product drawing, characterized in that: The steps include: S1. Weigh the coating agent and dissolve it in hot water according to a set weight ratio to obtain a coating solution; S2. Maintaining the temperature of the coating liquid, immersing the metal product in the coating liquid and then lifting it out of the liquid; or, maintaining the temperature of the coating liquid, spraying the coating liquid on the surface of the metal product; S3. Wait until the surface of the metal product is dry; Among them, sodium phytate forms an integrated compound with the metal. Phytate has a hexagonal ring structure. The terminal sodium ions are replaced with iron ions, aluminum ions, and Si under the catalytic action of the catalyst in the alkaline coating liquid to form a phytate iron, Si, and aluminum composite metal coating layer that meets the high-speed drawing requirements of metal products.

6. The use of the coating agent for drawing metal products according to claim 5 in the pre-treatment of metal product drawing, characterized in that: In step S1, the temperature of the hot water is 65-80°C.

7. The use of the coating agent for drawing metal products according to claim 5 in the pre-treatment of metal products drawing, characterized in that: In the coating liquid, the weight proportion of the coating agent is 15%-25%.

8. The use of the coating agent for drawing metal products according to claim 5 in the pre-treatment of metal products, characterized in that: In step S2, the temperature of the coating liquid is maintained at 65-80°C.

9. The use of the coating agent for drawing metal products according to claim 5 in the pre-treatment of metal products, characterized in that: In step S3, the surface of the metal product is dried by air drying.

10. The use of the coating agent for drawing metal products according to claim 5 in the pre-treatment of metal products drawing, characterized in that: The catalyst is oxygen gas filled into the coating liquid.

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