Environment-friendly water-based quenching liquid and preparation method thereof

Abstract

The present application relates to a kind of environment-friendly water-based quenching liquid compositions, including butyl acrylate 20-30%, styrene 4-6%, acrylic acid 4-8%, isododecanol 8-12%, sodium hydroxide 8-12%, antioxidant 1-3% by mass.The quenching liquid formula of the present application, styrene and butyl acrylate and acrylic acid occur partial copolymerization, generate styrene acrylate copolymer or styrene acrylic acid copolymer emulsion in water, cooperate with the mixed system formed by adding appropriate amount of isododecanol and water, when used as quenching liquid, compared with mineral oil, it has good stability and quenching penetration difference;Compared with water medium quenching liquid, it has better cooling capacity in high temperature zone, excellent wettability to aluminum alloy surface, and uniform quenching cooling effect.

Description

TECHNICAL FIELD

[0001] The present application relates to a water-based quenching liquid composition, in particular to an environmentally friendly water-based quenching liquid composition and a preparation and use method. BACKGROUND

[0002] Quenching liquid is a cooling medium for workpiece heat treatment quenching to improve the hardness of the workpiece and obtain good mechanical and metallographic structure. The commonly used quenching medium for aluminum alloy is mineral oil and water, but the use of mineral oil quenching is unstable, the hardenability is poor, and the environmental pollution is heavy; although water is the most economical quenching medium, its chemical stability is high, but the cooling capacity of pure water in the high temperature zone is not strong, and the wettability of water on the surface of aluminum alloy is poor, and the quenching cooling effect is uneven. SUMMARY

[0003] (I) Technical problems to be solved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present application provides an environmentally friendly water-based quenching liquid composition and a preparation method, which solves the technical problems of unstable mineral oil as quenching medium, poor hardenability, poor cooling capacity of water as quenching medium in high temperature zone, poor wettability on the surface of aluminum alloy, uneven quenching cooling effect, etc.

[0005] (II) Technical scheme

[0006] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the present application includes:

[0007] In the first aspect, the present application provides an environmentally friendly water-based quenching liquid composition, which comprises, by mass: butyl acrylate 20-30%, styrene 4-6%, acrylic acid 4-8%, isododecanol 8-12%, sodium hydroxide 8-12%, antioxidant 1-3%, and the balance is water.

[0008] According to the preferred embodiment of the present application, the antioxidant is at least one of phenothiazine, N,N'-di-sec-butyl-p-phenylenediamine and tert-butyl hydroquinone.

[0009] According to the preferred embodiment of the present application, the water is deionized water.

[0010] According to the preferred embodiment of the present application, the environmentally friendly water-based quenching liquid composition comprises, by mass: butyl acrylate 20%, styrene 4%, acrylic acid 6%, isododecanol 10%, sodium hydroxide 10%, antioxidant 2%, and the balance is water.

[0011] In a second aspect, the present application provides a preparation method of the environment-friendly water-based quenching liquid composition, which comprises: mixing butyl acrylate, styrene, acrylic acid and isododecanol, then adding sodium hydroxide solution at 70-90°C for 1.5-5 hours, and finally adding antioxidants and deionized water and stirring uniformly. Preferably, the stirring speed is 150-250 rpm.

[0012] In a third aspect, the present application provides a use method of the environment-friendly water-based quenching liquid composition, which is diluted to a mass concentration of 10-20% with deionized water before use.

[0013] (III) Beneficial effects

[0014] In the quenching liquid formula of the present application, butyl acrylate is used to enhance the quenching ability, styrene is used to improve the stability of the quenching liquid, and acrylic acid is mainly used to prevent cracking of aluminum alloy. Styrene, butyl acrylate and acrylic acid undergo partial copolymerization to generate styrene acrylate copolymer or styrene acrylic acid copolymer emulsion in water. In combination with the addition of an appropriate amount of isododecanol and water, the mixed system formed is used as a quenching liquid, which has good stability and poor quenching ability compared with mineral oil; compared with water medium quenching liquid, it has better cooling capacity in the high temperature zone and excellent wettability on the surface of aluminum alloy, and the quenching cooling effect is uniform.

[0015] Isododecanol is partly used as a quenching liquid system medium and partly used to improve and improve the surface wettability of the quenching liquid, and to accelerate the cooling speed of aluminum alloy by using its volatility; sodium hydroxide is partly used as a catalyst to promote the reaction of styrene with butyl acrylate and acrylic acid, and the other part is used to maintain the alkaline environment of the system to prevent solidification reaction of the emulsion during the storage period. Antioxidants can maintain the stability of the quenching liquid system on the one hand, and can adhere to the surface of the alloy material to prevent oxidation of the aluminum alloy surface when cooling the high-temperature aluminum alloy. By optimizing the amount of each component formula, an environment-friendly water-based quenching liquid with appropriate viscosity can effectively ensure the uniformity of the cooling effect. The environment-friendly water-based quenching liquid can effectively reduce pollution and improve the hardenability and hardenability of the workpiece. DETAILED DESCRIPTION

[0016] In order to better explain the present application, the present application is described in detail below in combination with specific embodiments.

[0017] Example 1

[0018] Butyl acrylate 20%, styrene 4%, acrylic acid 6%, isododecanol 10% were mixed and then sodium hydroxide solution (10% of industrial grade sodium hydroxide) was added and reacted at 80°C for 2 hours, then butylated hydroxytoluene 2% and deionized water 48% were added and stirred uniformly at 200 rpm.

[0019] Example 2

[0020] Butyl acrylate 30%, styrene 6%, acrylic acid 8%, isododecanol 10% were mixed and then sodium hydroxide solution (10% of industrial grade sodium hydroxide) was added and reacted at 80°C for 2 hours, then butylated hydroxytoluene 2% and deionized water 34% were added and stirred uniformly at 200 rpm.

[0021] Example 3

[0022] Butyl acrylate 20%, styrene 4%, acrylic acid 6%, isododecanol 10% were mixed and then sodium hydroxide solution (10% of industrial grade sodium hydroxide) was added and reacted at 60°C for 2 hours, then butylated hydroxytoluene 2% and deionized water 48% were added and stirred uniformly at 200 rpm.

[0023] Example 4

[0024] Butyl acrylate 20%, styrene 6%, acrylic acid 4%, isododecanol 10% were mixed and then sodium hydroxide solution (10% of industrial grade sodium hydroxide) was added and reacted at 80°C for 2 hours, then N,N'-di-sec-butyl-p-phenylenediamine 2% and deionized water 48% were added and stirred uniformly at 400 rpm.

[0025] Example 5

[0026] Butyl acrylate 22%, styrene 5%, acrylic acid 7%, isododecanol 9% were mixed and then sodium hydroxide solution (9% of industrial grade sodium hydroxide) was added and reacted at 80°C for 2 hours, then butylated hydroxytoluene 2% and deionized water 46% were added and stirred uniformly at 200 rpm.

[0027] Example 6

[0028] Butyl acrylate 28%, styrene 5%, acrylic acid 6%, isododecanol 11% were mixed and then sodium hydroxide solution (10% of industrial grade sodium hydroxide) was added and reacted at 80°C for 2 hours, then N,N'-di-sec-butyl-p-phenylenediamine 2% and deionized water 38% were added and stirred uniformly at 200 rpm.

[0029] Example 7

[0030] Butyl acrylate 25%, styrene 5%, acrylic acid 6%, isododecanol 8% were mixed, then sodium hydroxide solution (industrial grade sodium hydroxide dosage 11%) was added and reacted at 80°C for 2 hours, then N,N'-di-sec-butyl-p-phenylenediamine 2% and deionized water 43% were added, and stirred uniformly at a speed of 200 rpm.

[0031] Example 8

[0032] Butyl acrylate 20%, styrene 6%, acrylic acid 4%, isododecanol 12% were mixed, then sodium hydroxide solution (industrial grade sodium hydroxide dosage 10%) was added and reacted at 80°C for 2 hours, then N,N'-di-sec-butyl-p-phenylenediamine 2% and deionized water 46% were added, and stirred uniformly at a speed of 400 rpm.

[0033] The physical properties of the quenching liquid of each of the above examples are as follows:

[0034]

[0035] The quenching temperature of aluminum alloy is generally about 500°C. The design requirements for the quenching liquid are that the maximum cooling speed should be obtained at this temperature, the higher the cooling speed, the stronger the cooling capacity of the quenching liquid, and the better the performance of the quenching liquid. The higher the kinematic viscosity, the less the viscosity of the fluid is affected by temperature, the less sensitive the viscosity is to temperature, and the better the performance of the high-temperature quenching liquid, but the kinematic viscosity should not exceed 600 mm 2 / s (40°C), and a viscosity that is too large is not conducive to obtaining a high and uniform cooling speed.

[0036] In the examples, by removing or reducing the amount of butyl acrylate to 10% (the corresponding part is supplemented with deionized water), it is found that the maximum cooling speed of the quenching liquid is significantly reduced, the temperature corresponding to the maximum cooling speed is greatly different from the quenching temperature of aluminum alloy, and the application performance of the quenching liquid is poor.

[0037] In the examples, by removing or reducing the amount of styrene to 2% (the corresponding part is supplemented with deionized water), it is found that the quenching liquid has poor performance stability, cannot be stored, and the performance of the quenching liquid deteriorates rapidly during the quenching process.

[0038] In the examples, by removing or reducing the amount of isododecanol to 4% (the corresponding part is supplemented with deionized water), it is found that the quenching liquid is difficult to wet the surface of aluminum alloy, and the maximum cooling speed is significantly reduced.

[0039] In the examples, by removing or reducing the amount of acrylic acid to 1.5% (the corresponding part is supplemented with deionized water), it is found that small cracks easily appear on the surface of aluminum alloy.

[0040] To sum up, in the quenching liquid formula of the present application, butyl acrylate, styrene, acrylic acid and isododecanol play an important role, and if one or several components are removed or the amount thereof is reduced, the obtained mixed liquid will not be able to achieve the quenching performance of the quenching liquid of the present application. The quenching liquid of the present application has the optimal use effect in the aluminum alloy quenching process, and the quenching effect of other metal alloys is not significant, so the present application is a water-based (non-solvent type) environmentally friendly quenching liquid specially developed for aluminum alloy quenching.

[0041] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An environmentally friendly water-based quenching fluid composition for use in aluminum alloy quenching processes, characterized in that, By weight, it comprises: 20-30% butyl acrylate, 4-6% styrene, 4-8% acrylic acid, 8-12% isododecyl alcohol, 8-12% sodium hydroxide, 1-3% antioxidant, and the balance being water; its preparation method is as follows: Mix butyl acrylate, styrene, acrylic acid, and isododecyl alcohol, then add sodium hydroxide solution and react at 70-90℃ for 1.5-5 hours. Finally, add antioxidant and deionized water and stir until homogeneous.

2. The environmentally friendly water-based quenching fluid composition according to claim 1, characterized in that, The antioxidant is at least one of phenothiazine, N,N'-di-sec-butyl-p-phenylenediamine, and tert-butylhydroquinone.

3. The environmentally friendly water-based quenching fluid composition according to claim 1, characterized in that, The water is deionized water.

4. The environmentally friendly water-based quenching fluid composition according to claim 1, characterized in that, The environmentally friendly water-based quenching fluid composition comprises, by weight: 20% butyl acrylate, 4% styrene, 6% acrylic acid, 10% isododecyl alcohol, 10% sodium hydroxide, 2% antioxidant, and the balance being water.

5. A method of using the environmentally friendly water-based quenching fluid composition according to any one of claims 1-4, wherein the environmentally friendly water-based quenching fluid composition is diluted with deionized water to a mass concentration of 10-20% before use.

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