Metal drawing lubricant and preparation method thereof

Abstract

The metal drawing lubricant is prepared from the following components in parts by mass: 10 to 15 parts of ethylene glycol distearic acid, 5 to 8 parts of a nonionic surfactant, 5 to 6 parts of fatty acid, 5 to 6 parts of diethanol amine, 10 to 12 parts of fatty alcohol-polyoxyethylene ether phosphate, 0.4 to 0.5 part of a phenolic antioxidant, 0.1 to 0.2 part of a de-foaming agent, 0.4 to 0.5 part of benzotriazole, 0.1 to 0.2 part of a sterilizing agent and 59 to 64 parts of pure water, the ethylene glycol distearic acid is dispersed in the lubricant in the form of nano-particles, and the particle size of the nano-particles is less than 100 nanometers. The invention also discloses a preparation method of the metal drawing lubricant. The content of ethylene glycol distearic acid in a lubricant system can be effectively increased, meanwhile, it can be guaranteed that ethylene glycol distearic acid continuously and stably exists in the system and is not separated out, and therefore the lubricating performance of the lubricant is greatly improved, and the drawing speed can reach 10 m / s or above when the lubricant is applied to drawing of ultra-high-strength steel cords (ST) and ultra-high-strength steel cords (UT); therefore, the production efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to a metal drawing lubricant and also to a preparation method of the lubricant. Background Art

[0002] When steel cord is drawn, the friction between the steel wire and the die and the harsh drawing conditions will cause the die and wire to wear, the wire to break or the wire to have surface defects. To overcome these problems, oily or water-based lubricants are often used. Under extreme conditions, water-based lubricants are more popular because of their strong metal cooling ability, ease of use, low pollution and good economy.

[0003] CN1382203A discloses an aqueous lubricant emulsion, which mainly contains fatty acids, amines, fatty alcohol polyoxyethylene ether phosphoric acid, etc. The lubricant is suitable for drawing normal strength steel cord (NT) and high strength steel cord (HT), and the drawing speed can be greater than 10m / s, but its lubricating performance cannot meet the drawing of ultra-high strength steel cord (ST) and extra-high strength steel cord (UT).

[0004] US8555689B2 discloses a steel cord drawing lubricant, which contains fatty alcohol polyoxyethylene ether phosphate, alcohol amine, ethylene glycol distearic acid, etc. The lubricant can be used for drawing ultra-high strength steel cord (ST) and extra-high strength steel cord (UT), but can only be used when the drawing speed is less than 10m / s, thereby greatly reducing the production efficiency. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a metal drawing lubricant, which can be used for the drawing of ultra-high strength steel cord (ST) and extra-high strength steel cord (UT), and under the same drawing conditions (the same drawing conditions as US8555689B2), the drawing speed can reach more than 10m / s; another purpose of the present invention is to provide a method for preparing the above-mentioned metal drawing lubricant.

[0006] Technical solution: The metal drawing lubricant described in the present invention is composed of the following components in parts by mass: 10 to 15 parts of ethylene glycol distearate, 5 to 8 parts of nonionic surfactant, 5 to 6 parts of fatty acid, 5 to 6 parts of diethanolamine, 10 to 12 parts of fatty alcohol polyoxyethylene ether phosphate, 0.4 to 0.5 parts of phenolic antioxidant, 0.1 to 0.2 parts of defoaming agent, 0.4 to 0.5 parts of benzotriazole (BTA), 0.1 to 0.2 parts of bactericide and 59 to 64 parts of pure water.

[0007] The ethylene glycol distearate (EGDS) is dispersed in the aqueous lubricant system of the present invention in the form of nanoparticles, and the particle size of the nanoparticles is below 100 nanometers.

[0008] Wherein, the nonionic surfactant is an EO / PO block copolymer, wherein the molar ratio of EO / PO is 1:1, and the molecular weight thereof is between 3000 and 10000, and the molecular weight is preferably between 4000 and 6000.

[0009] The carbon chain length of the fatty acid is more than 16 carbon atoms and can be a saturated or unsaturated monobasic acid.

[0010] Among them, in the fatty alcohol polyoxyethylene ether phosphate, the carbon chain length of the fatty alcohol is more than 12 carbons, and it can be a saturated or unsaturated fatty alcohol, and preferably the carbon chain length is more than 16 carbons.

[0011] Wherein, the number of EO in the fatty alcohol polyoxyethylene ether phosphate is ≤5, preferably 0-3.

[0012] Wherein, the content of monoester in the fatty alcohol polyoxyethylene ether phosphate is greater than 70%.

[0013] The preparation method of the above-mentioned metal drawing lubricant comprises the following steps:

[0014] (1) Preparation of aqueous nano-dispersion:

[0015] (1.1) heating ethylene glycol distearic acid to a temperature above the melting point, and then adding a nonionic surfactant and benzotriazole thereto under stirring to obtain a mixed material;

[0016] (1.2) heating water to a temperature close to its boiling point; mixing the mixed material of step (1.1) with the heated water, and immediately sending the mixed material into a high-pressure homogenizer for homogenization; wherein the working pressure of the high-pressure homogenizer is greater than 800 bar;

[0017] (1.3) After flowing out of the high-pressure homogenizer, the mixture is rapidly cooled to below 30° C. through a pipeline to obtain an aqueous nanodispersion liquid;

[0018] (2) preparing an oil phase: mixing fatty acids, fatty acid polyoxyethylene ether phosphate, diethanolamine and a phenolic antioxidant, stirring under heating, and mixing thoroughly to obtain an oil phase;

[0019] (3) Slowly adding the aqueous nanodispersion into the oil phase under stirring, and adjusting the pH of the system to 8.2-8.7 after mixing;

[0020] (4) Finally, a bactericide and a defoaming agent are added thereto to obtain a metal wire drawing lubricant.

[0021] Wherein, in steps (1.1) to (1.2), the heating temperature is not less than 90°C.

[0022] Wherein, in step (1.2), the mixing mass ratio of the mixed material to the hot water is 15.4-20.4:59-64.

[0023] Wherein, in step (2), the heating temperature is 60-70°C.

[0024] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the present invention can effectively increase the content of ethylene glycol distearic acid in the lubricant system, while ensuring its continuous and stable existence in the system without precipitation, thereby greatly improving the lubricating performance of the lubricant, so that the lubricant of the present invention can be used in the drawing of ultra-high strength steel cord (ST) and extra-high strength steel cord (UT) to make the drawing speed reach more than 10m / s, thereby effectively improving production efficiency. DETAILED DESCRIPTION

[0025] The ethylene glycol distearic acid, EO / PO block copolymer, fatty acid, fatty alcohol polyoxyethylene ether phosphate, phenolic antioxidant, defoamer, benzotriazole and bactericide in the formula of the present invention are all commercial products and are purchased from outside.

[0026] Example 1

[0027] The metal drawing lubricant of the present invention is composed of the following components in parts by mass: 15 parts of ethylene glycol distearic acid, 5 parts of EO / PO block copolymer, 5 parts of fatty acid, 5 parts of diethanolamine, 10 parts of fatty alcohol polyoxyethylene ether phosphate, 0.4 parts of phenolic antioxidant, 0.1 parts of defoaming agent, 0.4 parts of benzotriazole (BTA), 0.1 parts of bactericide and 59 parts of pure water.

[0028] Among them, in the EO / PO block copolymer, the molar ratio of EO / PO is 1:1, and its molecular weight is 5000; the carbon chain length of the fatty acid is more than 16 carbons; in the fatty alcohol polyoxyethylene ether phosphate, the carbon chain length of the fatty alcohol is more than 16 carbons; the number of EO is 3; and the content of the monoester is greater than 70%.

[0029] The preparation method of the above-mentioned metal drawing lubricant comprises the following steps:

[0030] (1) Preparation of aqueous nano-dispersion:

[0031] (1.1) heating a formulated amount of ethylene glycol distearic acid to 90° C., and then adding a formulated amount of EO / PO block copolymer and benzotriazole thereto under stirring to obtain a mixed material;

[0032] (1.2) heating the formulated amount of pure water to 90° C.; mixing the mixed material of step (1.1) with the heated pure water at a mass ratio of 20.4:59 through a proportional valve, and immediately entering a high-pressure homogenizer for homogenization after mixing; wherein the average pressure of the high-pressure homogenizer is greater than 800 bar;

[0033] (1.3) After flowing out of the high-pressure homogenizer, the mixture is rapidly cooled to below 30° C. through a pipeline to obtain an aqueous nanodispersion liquid;

[0034] (2) preparing an oil phase: mixing the formulated amount of fatty acid, fatty acid polyoxyethylene ether phosphate, diethanolamine and phenolic antioxidant in a heatable blending kettle, stirring at a temperature of 60 to 70° C. for 1 hour to obtain an oil phase;

[0035] (3) slowly adding the aqueous nanodispersion obtained in step (1) to the oil phase in step (2) under stirring, stirring for 2 h, and adjusting the pH of the system to 8.2-8.7 using phosphoric acid and diethanolamine after mixing;

[0036] (4) Finally, a bactericide and a defoaming agent are added in a formulated amount to obtain a metal wire drawing lubricant.

[0037] Ethylene glycol distearate (EGDS) is dispersed in the aqueous lubricant system of Example 1 in the form of nanoparticles, and the particle size of the ethylene glycol distearate nanoparticles is less than 100 nanometers.

[0038] The lubricant obtained in Example 1 is a yellow viscous liquid, which is diluted to a 5 wt % working liquid, that is, 5 g of the lubricant is mixed with 95 g of water to obtain a working liquid with a mass fraction of 5%.

[0039] Example 2

[0040] The metal drawing lubricant of the present invention is composed of the following components in parts by weight: 10 parts of ethylene glycol distearic acid, 5 parts of EO / PO block copolymer, 5 parts of fatty acid, 5 parts of diethanolamine, 10 parts of fatty alcohol polyoxyethylene ether phosphate, 0.4 parts of phenolic antioxidant, 0.1 parts of defoaming agent, 0.4 parts of benzotriazole (BTA), 0.1 parts of bactericide and 64 parts of pure water.

[0041] Among them, in the EO / PO block copolymer, the molar ratio of EO / PO is 1:1, and its molecular weight is 5000; the carbon chain length of the fatty acid is more than 16 carbons; in the fatty alcohol polyoxyethylene ether phosphate, the carbon chain length of the fatty alcohol is more than 16 carbons; the number of EO is 3; and the content of the monoester is greater than 70%.

[0042] The preparation method of the above-mentioned metal drawing lubricant comprises the following steps:

[0043] (1) Preparation of aqueous nano-dispersion:

[0044] (1.1) heating a formulated amount of ethylene glycol distearic acid to 90° C., and then adding a formulated amount of EO / PO block copolymer and benzotriazole thereto under stirring to obtain a mixed material;

[0045] (1.2) heating the pure water in the formula to 90° C.; mixing the mixed material in step (1.1) with the heated pure water at a mass ratio of 15.4:64 through a proportional valve, and immediately entering a high-pressure homogenizer for homogenization after mixing; wherein the average pressure of the high-pressure homogenizer is greater than 800 bar;

[0046] (1.3) After flowing out of the high-pressure homogenizer, the mixture is rapidly cooled to below 30° C. through a pipeline to obtain an aqueous nanodispersion liquid;

[0047] (2) preparing an oil phase: mixing the formulated amount of fatty acid, fatty acid polyoxyethylene ether phosphate, diethanolamine and phenolic antioxidant in a heatable blending kettle, stirring at a temperature of 60 to 70° C. for 1 hour to obtain an oil phase;

[0048] (3) Under stirring, slowly add the aqueous nanodispersion obtained in step (1) to the oil phase of step (2), stir for 2 hours, and adjust the pH of the system to 8.2-8.7 using phosphoric acid and diethanolamine after mixing;

[0049] (4) Finally, a bactericide and a defoaming agent are added in a formulated amount to obtain a metal wire drawing lubricant.

[0050] Ethylene glycol distearate (EGDS) is dispersed in the aqueous lubricant system of Example 2 in the form of nanoparticles, and the particle size of the EGDS nanoparticles is below 100 nanometers.

[0051] The lubricant obtained in Example 2 is a yellow viscous liquid, which is diluted to a 5 wt % working liquid, that is, 5 g of the lubricant is mixed with 95 g of water to obtain a working liquid with a mass fraction of 5%.

[0052] Comparative Example 1 is the lubricant disclosed in US Pat. No. 8,555,689 B2.

[0053] Comparative Example 2

[0054] Compared with Example 1, the only difference between Comparative Example 2 and Example 1 is that the nonionic surfactant in Comparative Example 2 uses lauryl alcohol polyoxyethylene ether (wherein the EO number is 20) to replace the EO / PO block copolymer.

[0055] Comparative Example 3

[0056] Compared with Example 1, the only difference between Comparative Example 3 and Example 1 is that Comparative Example 3 uses lauryl alcohol polyoxyethylene ether phosphate (wherein the EO number is 5) to replace fatty alcohol polyoxyethylene ether phosphate.

[0057] Wire drawing test:

[0058] After 20 passes of the die, the ultra-high strength steel cord (UT) was directly reduced from 1.5mm to 0.28mm, the carbon content of the steel wire was 0.9%, the surface was covered with brass (64% copper), and the drawing speed was 10m / s. The lubricants in Comparative Example 1 and Examples 1-2 were diluted to 5wt.% working fluid, and 1000kg of steel wire was drawn respectively, and the die wear, copper loss on the steel wire surface and wire breakage rate were evaluated, as shown in Table 1.

[0059] Table 1

[0060]

[0061] By comparison, it is found that the lubricant of the present invention has good lubrication performance and stability, can significantly reduce the wire breakage rate during the drawing process, greatly reduce the loss of brass, and can significantly increase the drawing speed.

Claims

1. A metal drawing lubricant, characterized in that: The invention is composed of the following components in parts by mass: 10-15 parts of ethylene glycol distearic acid, 5-8 parts of nonionic surfactant, 5-6 parts of fatty acid, 5-6 parts of diethanolamine, 10-12 parts of fatty alcohol polyoxyethylene ether phosphate, 0.4-0.5 parts of phenolic antioxidant, 0.1-0.2 parts of defoaming agent, 0.4-0.5 parts of benzotriazole, 0.1-0.2 parts of bactericide and 59-64 parts of pure water.

2. The metal drawing lubricant according to claim 1, characterized in that: The ethylene glycol distearic acid is dispersed in the lubricant in the form of nanoparticles, and the particle size of the nanoparticles is below 100 nanometers.

3. The metal drawing lubricant according to claim 1, characterized in that: The nonionic surfactant is an EO / PO block copolymer, wherein the molar ratio of EO / PO is 1:1 and the molecular weight is 3000-10000.

4. The metal drawing lubricant according to claim 1, characterized in that: The carbon chain length of the fatty acid is more than 16 carbon atoms.

5. The metal drawing lubricant according to claim 1, characterized in that: In the fatty alcohol polyoxyethylene ether phosphate, the carbon chain length of the fatty alcohol is more than 12 carbon atoms; and the number of EO is ≤5.

6. The metal drawing lubricant according to claim 5, characterized in that: In the fatty alcohol polyoxyethylene ether phosphate, the content of monoester is greater than 70wt.%.

7. The method for preparing the metal drawing lubricant according to claim 1, characterized in that: The steps include: (1) Preparation of aqueous nano-dispersion: (1.1) heating ethylene glycol distearic acid to a temperature above the melting point, and then adding a nonionic surfactant and benzotriazole thereto under stirring to obtain a mixed material; (1.2) Heat water to a temperature close to its boiling point; The mixed material of step (1.1) is mixed with heated water, and immediately sent into a high-pressure homogenizer for homogenization after mixing; (1.3) After flowing out of the high-pressure homogenizer, the mixture is rapidly cooled to below 30° C. through a pipeline to obtain an aqueous nanodispersion liquid; (2) preparing an oil phase: mixing fatty acids, fatty acid polyoxyethylene ether phosphate, diethanolamine and a phenolic antioxidant, stirring under heating, and mixing thoroughly to obtain an oil phase; (3) Slowly adding the aqueous nanodispersion into the oil phase under stirring, and adjusting the pH of the system to 8.2-8.7 after mixing; (4) Finally, a bactericide and a defoaming agent are added thereto to obtain a metal wire drawing lubricant.

8. The preparation method according to claim 7, characterized in that: In steps (1.1) to (1.2), the heating temperature is not less than 90°C.

9. The preparation method according to claim 7, characterized in that: In step (1.2), the mixing mass ratio of the mixed material to the hot water is 15.4-20.4:59-64.

10. The preparation method according to claim 7, characterized in that: In step (2), the heating temperature is 60-70°C.

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