KR100717209B1 - The Composition of Clean Energy-saving Surface Lubricant For Cold Pozing Process - Google Patents

Abstract

The present invention relates to an energy-saving clean cold forging surface lubricant composition for forming a lubricating film on the surface of a material before molding in a cold forging process, the object of which is the cold forging process using the water-soluble surface lubricant treatment agent of the present invention Surface Lubricant in Esau saves more than 75% of energy by removing the burn coating process that has the highest water quality and air pollution in 10 processes, and forging by coating lubricant directly on the forging. By minimizing the generation of water, it reduces the environmental pollution by more than 90% and suppresses the generation of steam, greatly improving the working environment by more than 50%, reducing costs, improving the quality of forgings, and simplifying the work process. Excellent stability and defoaming power, very low volatility of pigment during forging work, and high lubricity of forging products and molds The surface lubricating agent for cold forging is 0.5-20% by weight of hydrophilic resin binder, which has excellent effect on the life of mold and anti-rusting of forged products. 0.5-5.0 wt% of water-soluble thickener, 0.5-5.0 wt% of wetting and dispersing agent, 0.1-3.0 wt% of rust preventive agent, 0.1-3.0 wt% of antifoaming agent, 1-9 wt% of molybdenum disulfide (MoS2) as inorganic pigment powder and graphite (Graphite: C) 1 to 9% by weight and 5 to 35% by weight of zinc (Zinc: Zn) and the rest is characterized by consisting of purified water.

Cold Forging, Lubricating Film, Lubricant, Molybdenum Disulfide

Description

The composition of Clean Energy-saving Surface Lubricant For Cold Pozing Process

The present invention relates to an energy-saving clean cold forging surface lubricant composition.

In general, forging is one of metal processing methods for pressing and deforming metal lumps or thick plates, and there are hot forging to be processed at high temperature and cold forging to be processed at warmer and room temperature lower than hot. While this cold forging can achieve high precision, surface lubrication is required.

Surface lubrication in cold forging is performed in advance to produce a mixed film of zinc phosphate, metal lubricating film, and metal soap, lubricating agent, on the surface of the material in order to improve the lubricity of the product during processing and to prevent sticking with the mold. .

In the conventional surface lubrication treatment, the scale formed on the surface is removed by degreasing and pickling processes, and then chemically treated with phosphate to coat the coating, neutralize it, preheat it, and apply sodium soap to the surface of the material and mold during cold forging. By preventing direct contact, it prevents seizure during molding and maintains the life of mold.

In the conventional surface lubrication treatment, ten processes of degreasing, washing, acid treatment, washing, washing, hot washing, chemical coating, washing, neutralizing, lubricating and drying after shot blasting are sequentially performed. Fill the chemicals in the tank, load the material into the tank filled with chemicals, process it for the corresponding time, move to the next process when it is completed, and take out the product when these 10 processes are completed.

The first process of the conventional surface lubrication operation is a degreasing process, and the most widely used method in the field of cold forging is alkali degreasing. Alkaline degreasing agents are inexpensive, effective in removing all contaminants in a single operation, and are easy to control.

Alkaline degreasing agents, however, must have saponification and emulsification capabilities, contain colloidal additives, and must be able to be removed from the wash.

As a material that can be used as the alkali degreasing agent, an alkaline surface active agent is the basic material. Surfactants reduce surface tension due to strong wettability even at low temperatures, and also have excellent emulsifying and dispersing properties.

The alkali degreasing agent should be able to firstly remove burnt-on carbon smut of carbon produced during heat treatment or pickling, and secondly, to remove grease and oil. Since it should be possible to remove the phosphate and soap residues produced after cold working, the alkaline degreasing agent should be chosen to satisfy the above conditions.

After the degreasing process, two stages of washing are performed, followed by a pickling process. Scales are formed on the surface of iron or steel products manufactured by heat treatment or hot forming. In order to remove these scales, shot blasting is performed before the process is introduced into the process. If picked up, carry out pickling. In the cold forging process, since the shot blasting is generally performed, pickling is necessary to increase the surface area of the base to increase the formation of zinc phosphate coating and the weight of the coating to increase the formability of cold forging.

After pickling, washing with rinse and hot water is followed by a zinc phosphate coating process. Zinc phosphate film increases the formability during cold forging, and helps the adhesion of soap in the post-lubrication process.

The solution used in the zinc phosphate coating process forms a film by attack of free acid on the steel surface and precipitation of phosphate crystals. Therefore, when some iron is dissolved into the solution, iron and zinc phosphate (Iron and Zinc Phosphate) adhere to the steel surface and form a film. The chemical phenomena involved are quite complex, but can be represented simply as:

First, due to the interaction between the metal surface and the free phosphoric acid, the first pickling reaction produces a ferrous phosphate ([Ferrous Phosphate / [2Fe (H2PO4) 2]) by the reaction of iron (Fe) and phosphoric acid.

Next, a local pH increase at the interface between the metal and the solution produces insoluble zinc phosphate (Zinc Phosphate / [Zn 3 (PO 4) 2]). In solution Zn (H 2 PO 4) 2 is in equilibrium with insoluble Zn 3 (PO 4) 2 and H 3 PO 4. Therefore, when reversing the reaction or adding free phosphoric acid to the working solution, soluble zinc phosphate is produced only when free phosphoric acid is reduced by contact with iron.

Therefore, after the zinc phosphate coating is treated as an overall reaction mechanism for precipitation deposition of the phosphate coating, it is washed with water and a neutralizing (Neutralising Rinse) process is performed.

The neutralization process is a process to increase the effect of the metal soap in the lubrication process, which is a post-process, the solution used in the neutralized water washing should be kept constant by the addition regularly.

However, even with regular chemicals, neutralized water is gradually contaminated and loses its effectiveness, and therefore the solution must be disposed of regularly. In general, it is good to re-bath once a week, and it is very important to manage the neutralized washing solution. Metal soap bath is the most expensive and its management is also important.

After the neutralization process, a metal lubrication process is performed. In the case of cold heading, reactive soap not only produces the lubrication required for single hole sizing or the draw of a calibration pass, but also continues with the multi-level heading that follows. To provide a suitable residual lubricant.

The metal soap is added to extend the lifespan, these main ingredients are high grade sodium stearate, corrosion inhibitors, reaction additives to promote the reaction with the phosphate coating, and to overcome the curing of water It consists of the components of the salt for.

As described above, the present invention has been devised to solve a complex process and environmental problems, and an object of the present invention is degreasing after washing with short-blasting in a conventional lubricating process in which about 10 processes are sequentially performed. Treatment-Washing-Washing-Chemical coating-Washing-Neutralization-Lubrication-Drying 10 steps of short blasting, followed by short blasting-Lubrication-Drying The energy cost generated by heating to 60 ~ 90 ℃ can be achieved by heating the temperature of 40 ~ 60 ℃ in two processes of hot water and lubrication of the present invention, energy saving of about 75% or more, degreasing, hot water, chemical coating, The chemical pollution generated in the neutralization and lubrication process and wastewater from the discharge of the flushing water of each process can be reduced, which can drastically reduce the environmental pollution by more than 90%. The work environment is also improved by more than 50% by suppressing the generation of waste water and steam. After the shot blasting, the cold forging material is preheated directly without the chemical coating, and 7 steps such as degreasing, washing, acid treatment, washing, chemical coating, washing and neutralization are omitted, and the cold forging lubricant is applied and dried. It is to provide an energy-saving clean cold forging surface lubricant composition reduced to three processes that can be cold forging.

Referring to the energy-saving clean cold forging surface lubricant composition in the cold forging process according to the present invention for achieving the above object as follows.

The lubricating agent according to the present invention is an aqueous lubricating agent concentrate in which 12 to 45% by weight of total solids are dispersed, and when the lubricating agent is applied, the total solid is diluted to a concentration of 3.0 to 15.0% and used. It is preferable to apply | coat to the surface of a raw material so that it may be deposited or sprayed so that it may become the surface area of a forging material, ie, the weight of about 1.5-15.0 g / m <2>.

Therefore, the new lubricating agent used in the present invention is a lubricating agent concentrate for blending lubricating agent for cold forging of metal, and satisfies cold forging with high strain rate. It was developed for the purpose of providing a product to be removed.

The above lubricating agent is a high viscosity liquid concentrate, the total solid content is 12-45% by weight, and the blending material is a hydrophilic resin binder such as Polyvinylpryrroridone, Polyvinylalcohol and Polyacrylic Acid, Polymethacrylic Acid or their cationic ammonium, sodium, potassium, Salts and surfactants such as lithium, calcium, zinc, bismuth and barium, for example, polyethylene glycol, polypropylene glycol, polyethylene glycol nonyl (or octyl) phenyl ether, polypropylene glycol nonyl (or octyl) phenyl ether, polyethylene glycol nonyl ( Or a surfactant which is solid or waxy at 30 ° C. or above among block copolymers of octyl) phenyl ether and polypropylene glycol nonyl (or octyl) phenyl ether, polyethylene glycol allkyl ether, polyethylene glycol fatty acid ester, and the like. For example, Hydroxy ethyl cellurose, Hydroxy propyl methyl cellurose, Carboxy methyl cellurose, etc. 0.5-20% by weight of hydrophilic resin binder mixed with one or more of Gellatine, Arabic gum, Dextrine, alpha starch, water soluble thickeners, for example, water soluble Cellurose, ie Hydroxy ethyl cellurose, Hydroxy propyl methyl cellurose, 0.5-5% by weight of a thickener mixed with one or more of carboxy methyl cellurose and Gellatine, Arabic gum, Dextrine, and alpha starch, and a wetting and dispersing agent such as Polyethylene glycol, Polypropylene glycol, Polyethylene glycol nonyl (or octyl ) phenyl ether, Polypropylene glycol nonyl (or octyl) phenyl ether, Polyethylene glycol nonyl (or octyl) phenyl ether and Polypropylene glycol nonyl (or octyl) phenyl ether Block Copolymer, Sodium dioctyl sulfosuccinate, Polyethylene glycol allkyl ether, Polyethylene glycol fatty acid 0.5 to 5% by weight of a wetting and dispersing agent mixed with one or more of ester and sodium dioctyl sulfosuccinate, and 0.1 to 5% by weight of antiseptic Benzotriazol. 0.1 to 3% by weight of an antifoaming agent mixed with one or more of octanol and a water-soluble silicone antifoaming agent, and 1 to 9% by weight of molybdenum disulfide (MoS2) and graphite (C) 1 to 1 as inorganic pigment powder. 9% by weight and 5 to 35% by weight of zinc (Zinc: Zn) and the remainder consists of purified water.

Here, the ratio of the inorganic pigment powder in the total solids is 60-90% by weight, and the mixing ratio of molybdenum disulfide, graphite and zinc in these inorganic pigment powders is mixed at a ratio of 5-35: 5-35: 40-80. On the premise that

The lubricating agent concentrate prepared in the above composition ratio can be delivered as an aqueous concentrate, and when applying lubricating agent, the total solid content is diluted to 3.0 ~ 15.0% concentration, and this lubricant is deposited or forged by spraying. It is preferable to apply | coat to the surface of a raw material so that it may become the surface area of ie, the weight of about 1.5-15.0 g / m <2>.

In the above composition ratio, when the amount of the hydrophilic resin binder is 0.5 to 20% by weight and less than 0.5% by weight, there is no binding force of the pigment. The dimensional tolerances between the water and the mold are so great that they reduce the quality of the forging and the life of the mold.

When the amount of the water-soluble thickener is 0.5 to 5% by weight and the viscosity is less than 0.5% by weight, the viscosity is low and the sedimentation of the pigment is severe. Forging can be a bad thing.

When the amount of the wetting and dispersing agent is 0.5 to 5% by weight, the dispersion of the pigment is poor when the amount of the wetting agent is 0.5 to 5% by weight or less, and the lubricating effect of the forging is also significantly reduced. If it is more than 5% by weight, manufacturing costs are high and economic efficiency is low. 0.1 to 5% by weight of Benzotriazol, 0.1 to 3% by weight of antifoaming agent, and inorganic pigment, molybdenum disulfide (MoS2) is 3 to 12% by weight and less than 3% by weight of lubricity and less than 12% by weight If this happens, manufacturing cost rises and sedimentation stability becomes poor.

Graphite (C) is used in the amount of 3 to 12% by weight, less than 3% by weight of lubricity, and more than 12% by weight of sedimentation stability is poor.

Zinc (Zinc: Zn) is 5 ~ 35% by weight, the sedimentation stability is less than 5% by weight, the viscosity rise and lubricity is lowered when more than 35% by weight.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Example 1-5

Purified water was added to a stirring vessel at room temperature in the amounts shown in Table 1, and then mixed with a dispersant, an antifoaming agent, and a rust preventive agent in order to make a homogeneous solution, and three kinds of inorganic pigments (molybdenum disulfide, graphite, and carbon powder) mixed in advance. Gently add to disperse sufficiently.

Next, add a hydrophilic resin binder and a thickener, and heat to about 40-80 ° C. to sufficiently dissolve the resin and the thickener into a homogeneous solution.

Thereafter, the homogeneous solution is placed in a ball mill, the ceramic ball is placed at 100% of the mixed solution height, milled at room temperature for 72 hours to disperse the pigment, and then purified water is added to dilute the total solids to 3.0 to 15.0%. do. The lubricating solution is heated to room temperature or about 70-90 ° C. to deposit or spray the forged material and apply it to the surface of the material so as to have a surface area of the forged material, that is, about 1.5 to 15.0 g / m 2, and dry by hot air. The application of the forging lubricant is completed.

After confirming the pH, sedimentation stability and defoaming force of the lubricating agent prepared in this way, the surface condition of the lubricated forging and the salt spray test and the lubrication and pigment volatility during forging were evaluated and evaluated.

[Test result]

The anti-corrosive effect of benzotriazol showed more than 2 hours of anti-rust effect at 0.5% use in 5% salt spray test, and more than 3 hours at 1.0%, and much better than the standard 1.5 hours. . Therefore, it is judged that there is no problem even if the addition amount is about 0.5%.

The anti-foaming power of octanol was much better for antifoaming than KM-73 alone. However, 0.5% of the antifoaming power was found to be appropriate due to the strong odor of octanol.

Sedimentation stability did not occur when 72 hours after diluting to the concentration of use (total solids 3.0 ~ 15.0%), and sediment was easily re-dispersed with light vibration.

The coating condition, lubricity and pigment volatility were all excellent in the forging test.

TABLE 1

 Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example standard Manufacturing compounding ratio Purified water 86.8 75.8 67.8 50.8 43.8 88-55 NP-10 * 1 One 2 2 3 2 0.5-5.0 Dispersant KM-73 * 2 0.5 0.5 0.5 0.5 0.5 0.1-3.0 Antifoam Octanol - 0.5 0.5 - 0.5 Benzotriazol 0.5 One One 0.5 One 0.1-3.0 Rust preventive PMA * 3 One - 2.0 1.0 One 0.5-20.0 Binder PEG6000 2 3 - 8.0 10 Binder MoS2 One 3 5 7 9 1.0-9.0 black smoke One 3 5 7 9 1.0-9.0 zinc 5.2 9.2 15.2 21.2 22.2 5.0-35.0 HPMC40US * 4 One 2 One One One 0.5-5.0 Thickener Solid weight pigment 7.2 / 12 = 60 15.2 / 20 = 76 25.2 / 30 = 84 35.2 / 40 = 88 40.2 / 45 = 89 weight% Total (%) 100.0 100.0 100.0 100.0 100.0 Property evaluation result Solid content (%) 12.0 20.0 30.0 40.0 45.0 27.0 12-45 pH 7.0 7.0 7.0 7.0 7.0 8.5 6.0-8.0 Antirust (time) 2.0 or higher 3.0 or higher 3.0 or higher 2.0 or higher 3.0 or higher 0.5 1.5 or more Salt spray Leveling coating property Great Great Great Great Great Bad Good or better Visual observation Lubricity Great Great Great Great Great Good Good or better Forging observation Sedimentation Stability Great Great Great Great Great Bad Good or better Visual observation Parcel time (minutes) Within 10 minutes Within 3 minutes Within 3 minutes Within 10 minutes Within 3 minutes Within 60 minutes Within 3 minutes Visual observation Pigment volatility Great Great Great Great Great Good Good or better Forging observation

*: Water-based lubricant coating agent for domestic cold-forging (S company)

* 1: NP-10: Polyethylene glycol nonyl phenyl ether / Southeast Synthesis

* 2: KM-73: Silicone Emulsion Antifoaming Agent / Japan Shinwol Silicone Production

* 3: PMA: Polymethacrylic Acid 100%

* 4: HPMC 40US: Hydroxy propyl methyl cellurose / Samsung Fine Chemicals

The energy-saving clean cold forging surface lubricant of the present invention removes the burn film process with the highest water quality and atmospheric environmental pollution in 10 processes, and forges by forging the lubricant directly on the forging by coating the lubricant. Reduce energy pollution and reduce waste water by more than 90%, and by suppressing steam generation, greatly improve the working environment by more than 50%, and reduce costs, improve the quality of forgings, and simplify the work process. Also, it has excellent sedimentation stability and anti-foaming power, very low volatility of pigment during forging work, improves lubricity of forging products and molds, prevents seizure, and obtains high precision products. In addition, it has an excellent effect on the life extension of the mold by the mold protection and the rust resistance of forged products.

Claims (3)

In the lubricating agent composition, 0.5-20% by weight of the hydrophilic resin binder, 0.5-5.0% by weight of the water-soluble thickener, 0.5-5.0% by weight of the wetting and dispersing agent, 0.1-3.0% by weight of the rust preventive agent, 0.1-3.0% by weight of the antifoaming agent, inorganic pigment powder 1 to 9% by weight of molybdenum disulfide (MoSb), 1 to 9% by weight of graphite (C), 5 to 35% by weight of zinc (Zinc), and the balance consists of purified water Energy-saving clean cold forging surface lubricant composition. The total solid content of the surface lubricant treatment agent is 5.0-45.0 wt%, the dilution concentration is 3.0-15.0 wt% during cold forging, and the proportion of inorganic pigment powder in the total solids is 60-90 wt%. Energy-saving clean cold forging surface lubricant composition comprising a. The energy-saving clean cold forging surface lubricant of claim 1, wherein the mixing ratio of molybdenum disulfide, graphite, and zinc in the inorganic pigment powder is mixed at a ratio of 5-35: 5-35: 40-80. Composition.