JPS6369889A - Production of lubricant for drawing of metallic material - Google Patents

Abstract

PURPOSE:To obtain the titled lubricant having high dispersion stability, forming little precipitate and having improved adhesivity and fixability to metallic materials such as iron alloy, Ni-Cr alloy, etc., by reacting powdery quick lime, an alkali metal salt of a higher fatty acid and water. CONSTITUTION:The objective lime soap lubricant is produced by reacting (A) powdery quick lime usually containing >=98% calcium oxide with (B) an alkali metal salt of usually 12-24C (un)saturated higher fatty acid (e.g. beef tallow fatty acid sodium salt) and (C) water usually for 2-3hr under agitation while cooling the system to <=100 deg.C (preferably keeping the system at about 80 deg.C).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for producing a lubricant for drawing various metal materials,
Especially iron, steel, stainless steel, chrome steel, molybdenum steel,
The present invention relates to a method for producing a lubricant for punching metal materials such as iron-based alloys such as titanium steel, as well as nickel-chromium alloy wires, rods, and pipe materials.

[Conventional technology]

Conventionally, metal materials such as wires, bars, and pipes made of iron, iron-based alloys, and other metals are treated with phosphoric acid, borax, oxalic acid, chlorine, or fluoride after pickling or mechanical descaling. A corrugated resin film or a lime soap film is applied, and the material is pultruded as it is or using a water-based lubricant, an oil-based lubricant, or a dry lubricant.

Among these lubricants, one type of lubricant or film-forming agent is a so-called lime soap lubricant, which has been used conventionally.

The above-mentioned lime soap lubricants have traditionally been in the form of lumps, e.g.
Larger products are produced by adding water to lump quicklime of 10 to 20 CI++ to generate heat, adding 5 to 20% of alkali salts of higher fatty acids based on the weight of quicklime, kneading, and reacting. When the suspension is used, it is further diluted with water and used as a suspension having a solid content of 5 to 25% by weight.

When drawing a metal material as described above, the metal material is immersed in the suspension at room temperature to about 60 degrees Celsius and then pulled out and dried naturally or forcefully to form a lime soap coating. After being formed on the material surface, it is drawn, and the lime soap film acts as a lubricant during this process.

[Problem that the invention seeks to solve]

The conventional lime soap lubricant manufacturing method described above and the lime soap lubricant obtained thereby have the following drawbacks.

(1) Since lump quicklime has large dimensions as mentioned above, it is difficult to control the calorific value when reacting with water.
For this reason, a relatively large batch-type reaction vessel is required, and a long time is required for each batch of reactions, resulting in poor productivity.

(2) Massive quicklime contains many impurities other than OaO, especially on the surface side and in the center (core), and therefore many unnecessary precipitates are formed.

(3) The particles of slaked lime in the suspension produced from the lump quicklime become large and have poor dispersibility, and therefore the suspension stability of the lime soap lubricant is poor and it separates and settles very quickly.

(4) Since the formed lime soap lubricant has poor adhesion to the surface of metal materials, it is necessary to increase its concentration.

(5) When a lime soap lubricant is applied to a metal material surface and then dried, a large amount falls off (poor adhesion).

(6) The lubricating power of the lime soap lubricant is not sufficient, so the die wears out quickly and the surface of the metal material after drawing is easily roughened.

(7) It has poor rust prevention properties, and under high temperature conditions, the surface of the metal material will rust in 1 to 2 days.

Since conventional methods for producing lime soap lubricants and lime soap lubricants produced thereby have the drawbacks described above, a method for producing lime soap lubricants and a lime soap lubricant that do not have these drawbacks is desired. There is.

It is therefore an object of the present invention to provide an improved lime soap lubricant and process for its production which overcomes the drawbacks mentioned above.

[Means for solving problems]

The present invention consists in the production of lime soap lubricants by reacting powdered quicklime, alkali salts of higher fatty acids and water.

The quicklime used in the present invention is powdered quicklime, which also includes granular quicklime. These are commercially available, and their standard composition is generally 98% or more of calcium oxide, and also contains small amounts of magnesium oxide, iron oxide, alumina, etc. as impurities. Further, this product has a loss on ignition of 1.0% or less and a hydrochloric acid insoluble content of less than 0.1%.

The alkali salts of higher fatty acids used in the present invention can be those conventionally used in lime soap lubricants, and are generally saturated or unsaturated higher fatty acids having 12 to 24 carbon atoms, such as stearic acid, oleic acid, These are salts or ammonium salts of alkali metals (Na, K:, Li) such as palmitic acid, lysyllic acid, linoleic acid, erucic acid, and lauric acid.

To carry out the method of the present invention, a reaction vessel equipped with a stirrer is charged with water of 2 to 4 times the weight of the quicklime used, and a higher fatty acid alkali containing 5 to 30% by weight of the weight of the quicklime used is added. Add salt and dissolve completely. Half of the amount of powdered quicklime to be used is added to this solution at a temperature below 50'C, preferably at room temperature, with stirring. At this time, the temperature of the contents of the reaction vessel rises, so the mixture is stirred while being cooled so as not to exceed 100°C. If the temperature exceeds 100°C, the content solution may boil, expand, and overflow from the reaction vessel.
It is preferable to maintain the temperature at around 0°C. Next, while maintaining this state, add the remaining quicklime in portions. The reaction is usually completed in 2 to 3 hours.

After the reaction is complete, the contents of the reaction vessel are cooled to room temperature, taken out from the reaction vessel, and stored. When drawing metal materials, the concentrated lubricant solution prepared as described above is usually diluted with water to a solids content of 5 to 30% by weight.

When drawing metal materials, the temperature is usually between room temperature and 60°C.
The metal material may be immersed in the lubricant solution while being slowly stirred to prevent foaming at a temperature of 100 ml, and adhered to the surface of the lubricant solution, and then drawn as is or after drying using a conventional method.

Note that the lime soap lubricant produced by the method of the present invention may optionally contain a rust preventive agent, a fixing agent, a dispersant, and a lubrication aid, thereby improving the stability of the lime soap lubricant suspension. It is possible to further improve adhesion, adhesion after drying, rust prevention, and lubricity.

Examples of rust preventives that can be used include inorganic substances such as sodium borate, sodium phosphate, sodium silicate, sodium molybdate, and sodium nitrite;
-organic amines such as diamine, jetanolamine, isopropylamine, and ethylenediamine. These are 001 to 5.0 of the lubricant suspension used when drawing metal materials.
It may be added in an amount of 0.05 to 2.0% by weight, preferably 0.05 to 2.0% by weight. If the amount added is less than 0.01% by weight, no effect as a rust preventive agent can be obtained, and if it exceeds 5.0% by weight, the stability of the lime soap lubricant suspension may be deteriorated, which is not preferable.

Possible fixing agents include water-soluble materials that act as binders, such as natural glue, glue, starch,
These include sodium alginate, water-soluble synthetic resins such as polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, sodium polyacrylate and its copolymers, and polyacrylamide.

The amount added is 001 to 2.00% of the lubricant suspension during drawing.
It is preferable to use it in a range of 0% by weight.

Dispersants that can be used include anionic surfactants and nonionic surfactants. Examples of anionic surfactants include higher alcohol sulfate sodium salts, castor oil sulfate sodium or ammonium salts, and polyoxyethylene alkyl sulfate sodium salts. There are sulfuric acid ester-based ones such as salts, sodium alkylbenzenesulfonates, sodium alkylnaphthalenesulfonates, and sulfonic acid-based ones such as sodium salts of petroleum sulfonates. Nonionic surfactants include polyoxyethylene octylphenol ether and polyoxyethylene. There are nonylphenol ethers, polyethylene glycol oleates, higher fatty acid pentaerythritol esters, higher fatty acid sorbitan esters, higher alkylamine ethers, and higher alcohol ethers. These dispersants are preferably used in an amount of 0.01 to 2.0% by weight of the lubricant suspension used.

Lubricating aids that can be used include animal and vegetable oils such as rapeseed oil, cottonseed oil, coconut oil, peanut oil, wood wax, beef tallow, lard oil, whale oil, and wool fat, as well as high-end clothing H1JH pentaerythol ester, higher fatty acid sorbitan. Esters such as esters, and metal soaps can also be used as lubricating aids. These are preferably used in an amount of 0.2 to 5.0% by weight of the lubricant suspension used.

[Effect]

According to the present invention, since powdered quicklime (including granules) is used, stirring during the production reaction is easy, reaction with water and even higher fatty acid alkali salts is easy, and temperature control is also easy. It is. Therefore, the reaction time can be shortened, and the reaction container can be easily prevented from boiling and overflowing, so that the amount of quicklime can be made smaller.

In addition, since powdered quicklime is highly pure and homogeneous, the produced lubricant has good dispersion stability, less precipitates, improved adhesion and fixation to metal materials, and greater lubricating power, extending die die life. .

〔Example〕

The present invention will be explained below with reference to comparative examples and examples.

Comparative Examples 1-2 Comparative Examples 1 and 2 have a capacity of 2001! 40 kg of lump quicklime with a diameter of 10 to 20 cm was placed in a rotary reactor (concrete mixer set), and 60 kg of water was added thereto.

After about 30 to 40 minutes, when the lump quicklime heats up and there are no lumps of quicklime, acicular beef tallow fatty acid soda salt is added to Comparative Example 1.
5 Ky was added in Comparative Example 2, and 8 Kg was added in Comparative Example 2, and rotation of the reaction vessel was started. The contents will thicken during the process, so add 40% of the remaining water.
Kq was added to form a suspension with a solids content of 40% by weight. The time required during this time was 4 hours. Thereafter, the rotation was stopped and allowed to cool, and when the temperature of the contents reached 30-50°C, the reaction vessel was turned over and taken out.

The reason why a rotary reactor was used was because quicklime is lumpy and cannot be stirred while lumps exist, and this method has been commonly used for a long time.

Examples 1 to 4 In Examples 1 to 4, the capacity was ff1300 l! In Examples 1, 2, and 4, 70 kg of water and 5 kg of acicular tallow fatty acid soda were placed in a water-cooled and steam-heated reaction vessel equipped with a stirrer.
In the example, 8 kg was added and the humidity was adjusted to 40 to 6 while stirring.
The alkaline soap was completely dissolved by heating to 0°C. Thereafter, the reactor was cooled with water, and when the temperature of the contents reached 30 to 40°C, 9 was added to powdered quicklime 20. 10-15 minutes after adding powdered quicklime, the humidity of the contents will be 90-100"C.
It became. At this time, care was taken to ensure that the temperature did not exceed 100°C, and if there was a risk of this, the pot was cooled with water.

Furthermore, at a temperature between 70 and 90°C, add 20% of the remaining quicklime powder.
The reaction was terminated by adding Ky and 30 g of water in 4 portions. The time required during this time was 1.5 hours.

In Examples 2 to 4, the antirust additives, fixing agents, dispersants, and lubrication aids shown in Table 1 were added to the above reaction products to a size of 0.
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Comparative Examples 1 and 2 obtained by the above manufacturing method, and Examples 1 and 2
, 3.4 were each diluted into an aqueous solution with a solid content of 10% by weight, and a performance comparison test was conducted on the obtained lubricants.The results are as follows.

(1) Result of sedimentation comparison test of lubricant suspension
The test tubes were shaken well and allowed to stand, and the sedimentation speed was measured by the number of parts whose tops became transparent over time.

As is clear from the data in Table 2 above, the lubricant suspension prepared by the method of the present invention has particularly slow sedimentation within a short period of time, and the dispersibility of the lubricant suspension is accordingly good and stable.

(2) Rust prevention comparative test results A polished iron plate (material 5s-41,) was immersed in the lubricant suspension of Comparative Example 1゜2 and Examples 1 to 4, and then σ1
I put it on top and let it dry naturally. Each iron plate was hung in a desiccator at 100% humidity and left indoors to examine the state of rust.

The results are as shown in Table 3 below. The lubricant made by the method of the present invention has excellent rust prevention ability, and Examples 2 to 4 in which rust prevention additives were added have even better rust prevention ability. (○No hook, Δ point hook, many X point hooks, x side rust) (3) Two types of wire rods with lubricant suspension and sulfuric acid pickling after wire drawing (S-4 with a diameter of 9.50 m
5c material and 80M material with a diameter of 5.50 rrvn) were immersed in the lubricant suspensions (solid content 10% by weight) of each comparative example and each example at a humidity of 60°C, and then pulled out and air-dried to stretch them. The amount of adhesion on the surface was measured.

The results are shown in Table 4, and it is clear that the lubricant prepared by the method of the present invention has a greater ability to adhere to the wire drawing skin.

Normally, the amount of lubricant adhesion resistance should be measured after immersing the wire in a lubricant suspension and drying it, but this is because a large amount of deposits from the wire sampling process fall off the metal surface and the measured value changes greatly. Measured after wire drawing.

(4) Wire drawability The above S-45c material with a diameter of 9.50 rss is passed through a single-head wire drawing machine to a diameter of 8.50 rss. The thickness of the die was examined when wire was drawn to OO#. As a result, the die diameter is 0.01
The wire rod treated with the lubricant of Comparative Example 2 had an average weight of 10 tons, while the wire rod of Example 3 of the present invention
The average amount of i'fU'f lubricant was 18 tons.

(5) Dispersion power of lubricant and sediment at the bottom of processing tank 1 lubricant suspension (purity 10% by weight) of Comparative Example 2 and Example 3 was
As a result of using the Qton tank for half a year, the processed wire storage area of Example 3 was clean with very little lubricant (powder) falling off compared to Comparative Example 2.

Furthermore, when the tank was cleaned after six months of use, a large amount of relatively large particles of sediment had accumulated on the bottom of the tank in Comparative Example 2, but this was hardly seen on the bottom of the tank in Example 3. It was confirmed that the tank could be used semi-permanently by simply replenishing the lime suspension without having to clean it.

〔Effect of the invention〕

As mentioned above, the lubricants produced by the method of the present invention are superior in performance to those produced by conventional methods.

Claims (1)

[Claims] 1. A method for producing a lubricant for drawing metal materials, which comprises reacting powdered quicklime, an alkali salt of a higher fatty acid, and water.