Rolling agent for Hi-B steel and preparation method thereof

Abstract

The invention discloses a rolling agent for Hi-B steel and a preparation method of the rolling agent. The rolling agent for the Hi-B steel comprises # imgabs 0 #, wherein the structural formula of modified triazine acid is as follows: # imgabs 1 #.

Description

Technical Field

[0001] The invention relates to a rolling preparation, in particular to a rolling preparation for Hi-B steel and a preparation method thereof. Background Art

[0002] Due to the increasing requirements for energy conservation and emission reduction, relevant national departments are considering revising and strengthening the standards for transformer energy efficiency upgrades, especially the energy efficiency upgrades of distribution transformers, which will put forward new requirements for the grades, specifications and performance levels of oriented electrical steel. In the future, the use of general oriented electrical steel (CGO steel) will gradually decrease, and the use of high magnetic induction oriented electrical steel (Hi-B steel) will gradually increase or expand.

[0003] With the increasing demand for Hi-B steel, the quality requirements for Hi-B steel plates after cold rolling are getting higher and higher, especially the corrosion resistance requirements for rolled plates are getting higher and higher. Therefore, it is imperative to invent a new Hi-B steel rolling medium with high corrosion resistance.

[0004] The difference from ordinary silicon steel is that: Hi-B steel has a higher silicon content, and ferrosilicon alloys easily form galvanic cells on the surface of the steel plate. As the silicon content increases, the corrosion resistance potential decreases, making it more susceptible to corrosion; secondly, their rolling temperatures are different. As the silicon content increases, the yield strength and tensile strength of the steel increase significantly, and the hardness also increases accordingly. In this way, the amount of reduction during rolling becomes larger and larger, and the material toughness decreases, which easily leads to grain breakage in the steel plate, belt breakage, and affects production. Therefore, high-temperature rolling is often used to prevent grain breakage. During high-temperature rolling, the temperature of the roll gap area will be very high, which requires the anti-rust additive to have strong adsorption properties so that it can be firmly adsorbed on the steel plate, thereby achieving a good anti-corrosion effect. This poses a challenge to silicon steel cold rolling oil.

[0005] The existing rolling media for Hi-B steel mainly use traditional benzazole and sulfonate additives. These two types of anti-rust additives have shortcomings when used in the Hi-B steel rolling process, which are specifically manifested in the following points:

[0006] (1) Due to the particularity of Hi-B steel materials, high-temperature rolling is often used to avoid broken bands and grain breakage during the rolling process. However, as the temperature increases during the rolling process, the adsorption of these two types of additives on the metal surface will weaken, resulting in desorption, which reduces the anti-corrosion effect.

[0007] (2) Because the temperature of Hi-B steel is high during rolling, benzoazole additives will emit a very bad odor when used under high temperature conditions, polluting the surrounding environment;

[0008] (3) Sulfonate additives will form metal salt residues on the surface of the plate after rolling, which will affect the cleaning of the plate surface after rolling and will also affect the subsequent annealing, greatly increasing the defective rate of the product.

[0009] Based on the above background, it is necessary to design a new type of rolling medium suitable for Hi-B steel.

[0010] The study shows that: modified triazinic acid, by utilizing the synergistic effect of ester bonds, amide bonds, and carboxylic acid bonds, can be well adsorbed to the surface of the strip to form a hydrophobic monolayer with good orientation and close arrangement, which can effectively reduce the transmission capacity of water molecules, oxygen molecules and electrons to the metal surface, so that the critical potential of the matrix metal oxidation is positively shifted, and the oxidation-reduction current of the metal surface is significantly reduced, thereby playing a protective role on the surface of silicon steel; modified triazinic acid, by utilizing the thermal stability of amide groups and carboxylic acid groups, reduces the probability of their desorption from the surface of silicon steel plates under high temperature conditions, and the three functional groups with different polarities (ester, amide, acid) can have a good synergistic effect to form a more dense protective layer, thereby playing a good anti-corrosion role under high-temperature rolling conditions; modified triazinic acid, by utilizing the larger molecular weight and the synergistic adsorption of acid, amide, and ester bonds, forms a more efficient and firm adsorption film on the surface of silicon steel, which not only plays an anti-corrosion role, but also plays a good lubricating role. The lubrication between the strip and the roller is increased, which can better protect the working roller and the strip surface and improve the plate surface quality; the modified triazinic acid is inexpensive and greatly reduces the cost of rolling oil; the modified triazinic acid is not easily soluble in water and is easy to be treated in the downstream sewage. Summary of the invention

[0011] In order to solve the above technical problems, the present invention provides a rolling agent for Hi-B steel, wherein the rolling agent for Hi-B steel comprises:

[0012]

[0013] The structural formula of the modified triazine acid is as follows:

[0014]

[0015] It is worth mentioning that the modified triazinic acid uses the thermal stability of the amide group and the carboxylic acid group to reduce the probability of their desorption from the surface of the silicon steel plate under high temperature conditions, and the three functional groups with different polarities, namely ester, amide, and acid, can have a good synergistic effect to form a denser protective layer, thereby playing a good anti-corrosion role under high-temperature rolling conditions. In addition, the modified triazinic acid uses a larger molecular weight and the synergistic adsorption of acid, amide, and ester bonds to form a more efficient and firm adsorption film on the surface of silicon steel, which not only plays an anti-corrosion role, but also has a good lubricating effect. In this way, the lubrication between the strip and the roller is increased, which can better protect the working roller and the strip surface and improve the quality of the plate surface.

[0016] In addition, the modified triazinic acid is inexpensive, which greatly reduces the cost of rolling preparations for Hi-B steel; on the other hand, the modified triazinic acid is not easily soluble in water and is easy to treat in downstream wastewater.

[0017] In a preferred embodiment, the groups R1, R2, and R3 are derived from the alkyl portion of coconut oleic acid, oleic acid, stearic acid, linoleic acid, lauric acid, ricinoleic acid, tall oil acid, or palmitoleic acid, respectively.

[0018] In a preferred embodiment, the groups R1, R2, and R3 are the same or different.

[0019] m is derived from the alkyl portion of palmitoleic acid or stearic acid, and n is derived from the alkyl portion of oleic acid or lauric acid.

[0020] In a preferred embodiment, the natural oil is selected from one or a mixture of at least two of lard, coconut oil, palm oil and palm kernel oil.

[0021] In a preferred embodiment, the synthetic ester is a diester, triester or tetraester synthesized from polyols and fatty acids with different carbon chain lengths.

[0022] In a preferred embodiment, the synthetic ester is a diester, triester or tetraester synthesized from polyols and fatty acids with different carbon chain lengths, and the carbon chain length of the fatty acid used to synthesize the synthetic ester is 12 to 20 carbon atoms.

[0023] In a preferred embodiment, the mineral oil is paraffin-based with a viscosity ranging from 30 to 100 cst at 40°C.

[0024] In a preferred embodiment, the extreme pressure anti-wear additive is a mixture of a sulfur-containing extreme pressure anti-wear agent and a phosphorus-containing extreme pressure anti-wear agent.

[0025] In a preferred embodiment, the sulfur-containing extreme pressure anti-wear agent is a sulfurized ester or an alkyl polysulfide.

[0026] The phosphorus-containing extreme pressure anti-wear agent is an alkyl phosphate or a thiophosphate amine salt.

[0027] In a preferred embodiment, the antioxidant is an aromatic amine type or a phenol amine type antioxidant.

[0028] In a preferred embodiment, the emulsifier is selected from polyoxyethylene alkylamine, fatty alcohol polyoxyethylene ether or high molecular weight polyether emulsifier.

[0029] To solve the above technical problems, according to another aspect of the present invention, the present invention provides a method for preparing a rolling preparation for Hi-B steel, characterized in that it comprises the following steps:

[0030] Step S1001, adding natural oil, synthetic ester and mineral oil into a container in sequence;

[0031] Step S1002, adding an antioxidant into the container and stirring evenly until the antioxidant is completely dissolved;

[0032] Step S1003, adding modified triazinic acid, extreme pressure anti-wear additives, and emulsifiers into the above container in sequence, and stirring evenly to obtain the rolling agent for Hi-B steel, wherein the prepared rolling agent for Hi-B steel includes the following components in weight percentage:

[0033]

[0034] According to a preferred embodiment of the present invention, the method for preparing the rolling agent for Hi-B steel needs to meet the following conditions:

[0035] In step S1002, after stirring until the antioxidant is completely dissolved, the temperature in the container is raised to 70-80° C.;

[0036] In step S1003, the temperature in the container is adjusted to 48-57°C. DETAILED DESCRIPTION

[0037] The preferred embodiments described below are for example only, and those skilled in the art may think of other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0038] The rolling agent for Hi-B steel according to a preferred embodiment of the present invention will be described in detail below, wherein the rolling agent for Hi-B steel comprises:

[0039]

[0040] The structural formula of the modified triazine acid is as follows:

[0041]

[0042] It is worth mentioning that the modified triazinic acid uses the thermal stability of the amide group and the carboxylic acid group to reduce the probability of their desorption from the surface of the silicon steel plate under high temperature conditions, and the three functional groups with different polarities, namely ester, amide, and acid, can have a good synergistic effect to form a denser protective layer, thereby playing a good anti-corrosion role under high-temperature rolling conditions. In addition, the modified triazinic acid uses a larger molecular weight and the synergistic adsorption of acid, amide, and ester bonds to form a more efficient and firm adsorption film on the surface of silicon steel, which not only plays an anti-corrosion role, but also has a good lubricating effect. In this way, the lubrication between the strip and the roller is increased, which can better protect the working roller and the strip surface and improve the quality of the plate surface.

[0043] In addition, the modified triazinic acid is inexpensive, which greatly reduces the cost of rolling preparations for Hi-B steel; on the other hand, the modified triazinic acid is not easily soluble in water and is easy to treat in downstream wastewater.

[0044] In a preferred embodiment, the groups R1, R2, and R3 are derived from the alkyl portion of coconut oleic acid, oleic acid, stearic acid, linoleic acid, lauric acid, ricinoleic acid, tall oil acid, or palmitoleic acid, respectively.

[0045] In a preferred embodiment, the groups R1, R2, and R3 are the same or different.

[0046] m is derived from the alkyl portion of palmitoleic acid or stearic acid, and n is derived from the alkyl portion of oleic acid or lauric acid.

[0047] In a preferred embodiment, the natural oil is selected from one or a mixture of at least two of lard, coconut oil, palm oil and palm kernel oil.

[0048] In a preferred embodiment, the synthetic ester is a diester, triester or tetraester synthesized from polyols and fatty acids with different carbon chain lengths.

[0049] In a preferred embodiment, the synthetic ester is a diester, triester or tetraester synthesized from polyols and fatty acids with different carbon chain lengths, and the carbon chain length of the fatty acid used to synthesize the synthetic ester is 12 to 20 carbon atoms.

[0050] In a preferred embodiment, the mineral oil is paraffin-based with a viscosity range of 30 to 100 cst at 40°C.

[0051] In a preferred embodiment, the extreme pressure anti-wear additive is a mixture of a sulfur-containing extreme pressure anti-wear agent and a phosphorus-containing extreme pressure anti-wear agent.

[0052] In a preferred embodiment, the sulfur-containing extreme pressure anti-wear agent is a sulfurized ester or an alkyl polysulfide.

[0053] The phosphorus-containing extreme pressure anti-wear agent is an alkyl phosphate or a thiophosphate amine salt.

[0054] In a preferred embodiment, the antioxidant is an aromatic amine type or a phenol amine type antioxidant.

[0055] In a preferred embodiment, the emulsifier is selected from polyoxyethylene alkylamine, fatty alcohol polyoxyethylene ether or high molecular weight polyether emulsifier.

[0056] Embodiment 1:

[0057] A rolling preparation for Hi-B steel, comprising the following components:

[0058] Components Content (weight %) Modified triazinic acid 2.0 lard 31.0 Palm Oil 15.0 Synthetic triesters 25.0 Mineral oil 20.0 Butylphenol 0.5 Amide phosphate 1.0 Alkyl sulfide 3.5 Polyoxyethylene ether 2.0

[0059] Table 1

[0060] Embodiment 2:

[0061] A rolling preparation for Hi-B steel, comprising the following components:

[0062]

[0063]

[0064] Table 2

[0065] In Table 1 and Table 2, lard, palm kernel oil, palm oil, and coconut oil are natural oils and fats; synthetic triesters and synthetic tetraesters are synthetic esters; mineral oil is selected from paraffin-based oils with a viscosity range of 30 to 100 cst at 40°C; butylphenol and dimethylamino-p-cresol are antioxidants; amine phosphates, alkyl sulfides, oleyl alcohol phosphates, and sulfurized lard are extreme pressure and anti-wear additives; polyoxyethylene ethers and polyoxyethylene alkylamines are emulsifiers.

[0066] The rolling preparation for Hi-B steel in Examples 1 to 2 can be prepared according to the following production steps:

[0067] Step A: Add natural oil and mineral oil into a container in sequence, and raise the temperature in the container to 70-80°C;

[0068] Step B: adding an antioxidant to the above container, stirring evenly until the antioxidant is completely dissolved, and adjusting the temperature in the container to 48-57° C.;

[0069] Step C: Add modified triazinic acid, extreme pressure anti-wear additives and emulsifiers into the above container in sequence, and stir evenly to obtain a rolling preparation for Hi-B steel.

[0070] The method for using the Hi-B steel rolling medium of the present invention is as follows: during the rolling process, the Hi-B steel rolling medium of the present invention is dispersed in deionized water to form an emulsion system, and rolling is performed in the form of an emulsion, wherein the mass concentration of the Hi-B steel rolling medium in the emulsion system is 2.0% to 4.0%.

[0071] Comparative Example:

[0072] Two commercially available Hi-B steel rolling media, A and B, were selected as comparative examples and compared with the performance of the examples. According to customer feedback, these two products have been in operation on site for many years, but both have problems such as plate surface corrosion, difficulty in cleaning, and high sewage treatment costs.

[0073] The anti-corrosion performance of the finished products of Example 1, Example 2 and Comparative Examples A and B was tested, and the performance test results are shown in the following table:

[0074] Anti-corrosion test:

[0075] In order to evaluate the anti-corrosion performance of Hi-B steel rolling media, the wet heat box test method was used to evaluate and compare the Hi-B steel rolling media of Example 1 and Example 2 with the conventional Hi-B steel rolling media of the same type on the market, Comparative Example A and Comparative Example B, respectively. The evaluation method adopted GB-T2361.

[0076]

[0077]

[0078] Table 3

[0079] It can be seen from the anti-corrosion test results in Table 3 that the anti-corrosion time of the rolling agent for Hi-B steel of the present invention is much longer than that of similar conventional Hi-B steel rolling oils on the market, indicating that the oil film strength of the Hi-B steel rolling medium of the present invention is high, and the oil film formed in the roll gap area during high-temperature rolling is not easy to break, thereby improving the anti-corrosion ability, indicating that the Hi-B steel rolling medium of the present invention has strong corrosion resistance, reduces the quality problem of plate surface rust after rolling, and thus effectively reduces the product unqualified rate of the steel plant.

[0080] Reciprocating friction test:

[0081] In order to evaluate the lubrication performance of Hi-B steel rolling media, a reciprocating friction tester was used to evaluate and compare the Hi-B steel rolling media of Example 1 and Example 2 with conventional Hi-B steel rolling media of the same type on the market, Comparative Example A and Comparative Example B, respectively. The evaluation results are as follows:

[0082]

[0083] Table 4

[0084] It can be seen from the reciprocating friction test results in Table 4 that, compared with Comparative Examples A and B, the friction coefficients of Examples 1 and 2 are relatively low, indicating that the rolling agent for Hi-B steel of the present invention can provide good lubrication during high-temperature rolling, effectively reduce the rolling force, and reduce quality problems such as broken strips and scratches, thereby greatly improving production efficiency.

[0085] In summary, the rolling agent for Hi-B steel of the present invention can form a dense and high-temperature resistant protective film in the roll gap area, effectively reduce the transmission capacity of water molecules, oxygen molecules and electrons to the metal surface, improve the protection of silicon steel plates after rolling, and significantly improve the anti-corrosion ability; secondly, the dense protective film increases the lubrication between the strip and the rollers, reduces lubrication defects such as scratches and scrapes on the surface of the plate during rolling, and improves the plate surface quality; finally, the modified triazinic acid is not easily soluble in water and is easy to be treated in the subsequent sewage.

[0086] The present invention provides a method for preparing a rolling preparation for Hi-B steel, comprising the following steps:

[0087] Step S1001, adding natural oil, synthetic ester and mineral oil into a container in sequence;

[0088] Step S1002, adding an antioxidant into the container and stirring evenly until the antioxidant is completely dissolved;

[0089] Step S1003, adding modified triazinic acid, extreme pressure anti-wear additives, and emulsifiers into the above container in sequence, and stirring evenly to obtain the rolling agent for Hi-B steel, wherein the prepared rolling agent for Hi-B steel includes the following components in weight percentage:

[0090]

[0091] According to a preferred embodiment of the present invention, the method for preparing the rolling agent for Hi-B steel must meet the following conditions:

[0092] In step S1002, after stirring until the antioxidant is completely dissolved, the temperature in the container is raised to 70-80° C.;

[0093] In step S1003, the temperature in the container is adjusted to 48-57°C.

[0094] It should be understood by those skilled in the art that the embodiments of the present invention described above are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A rolling agent for Hi-B steel, characterized in that: The rolling agent for Hi-B steel includes: The structural formula of the modified triazine acid is as follows:

2. The rolling agent for Hi-B steel according to claim 1, characterized in that The groups R1, R2, and R3 are derived from the alkyl portion of coconut oleic acid, oleic acid, stearic acid, linoleic acid, lauric acid, ricinoleic acid, tall oil acid, or palmitoleic acid, respectively.

3. The rolling agent for Hi-B steel according to claim 1, characterized in that The groups R1, R2, R3 are identical or different.

4. The rolling agent for Hi-B steel according to claim 1, characterized in that m is derived from the alkyl portion of palmitoleic acid or stearic acid, and n is derived from the alkyl portion of oleic acid or lauric acid.

5. The rolling agent for Hi-B steel according to claim 1, characterized in that The natural oil is selected from one of lard, coconut oil, palm oil and palm kernel oil or a mixture of at least two of them.

6. The rolling agent for Hi-B steel according to claim 1, characterized in that The synthetic ester is a diester, triester or tetraester synthesized from polyols and fatty acids with different carbon chain lengths. The carbon chain length of the fatty acid used to synthesize the synthetic ester is 12 to 20 carbon atoms.

7. The rolling agent for Hi-B steel according to claim 1, characterized in that The mineral oil is selected from paraffin base with a viscosity range of 30 to 100 cst at 40°C.

8. The rolling agent for Hi-B steel according to claim 1, characterized in that The extreme pressure anti-wear additive is a mixture of a sulfur-containing extreme pressure anti-wear agent and a phosphorus-containing extreme pressure anti-wear agent; The sulfur-containing extreme pressure anti-wear agent is a sulfurized ester or an alkyl polysulfide; the phosphorus-containing extreme pressure anti-wear agent is an alkyl phosphate or a thiophosphate amine salt; The antioxidant is an aromatic amine or phenol amine antioxidant; The emulsifier is selected from polyoxyethylene alkylamine, fatty alcohol polyoxyethylene ether or high molecular weight polyether emulsifier.

9. A method for preparing a rolling preparation for Hi-B steel, characterized in that: The following steps are involved: Step S1001, adding natural oil, synthetic ester and mineral oil into a container in sequence; Step S1002, adding an antioxidant into the container and stirring evenly until the antioxidant is completely dissolved; Step S1003, adding modified triazinic acid, extreme pressure anti-wear additives, and emulsifiers into the above container in sequence, and stirring evenly to obtain the rolling agent for Hi-B steel, wherein the prepared rolling agent for Hi-B steel includes the following components in weight percentage:

10. The method for preparing a rolling agent for Hi-B steel according to claim 9, characterized in that: The method for preparing the rolling preparation for Hi-B steel must meet the following conditions: In step S1002, after stirring until the antioxidant is completely dissolved, the temperature in the container is raised to 70-80° C.; In step S1003, the temperature in the container is adjusted to 48-57°C.

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