JPH02229893A - Composition for wire covering - Google Patents

Abstract

PURPOSE:To obtain the subject composition having an excellent crystal structure, soap-lubricant pull-in and pull-out properties and low moisture absorption and capable of ready cold pultrusion by blending K2SO4, etc., with a specified alkaline soap in a specified ratio. CONSTITUTION:An objective composition containing (A) 95-99.99wt.% K2SO4 and/or Na2SO4 and (B) 0.01-5wt.% one or more alkaline soaps selected from potassium soap, ammonium soap and sodium soap and having <=50wt.% total Na ion in the composition based on the sum of the total K ion and the total NH3 ion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an improved coating composition, particularly a water-soluble salt coating, for use in cold drawing of wire rods.

[Prior Art] Water-soluble salt coatings are often coated onto steel wire in the form of an aqueous solution prior to drawing. It is a well-known method to dry such solution-coated steel wire and to draw the resulting salt-coated steel wire in a conventional drawing die using a dry soap lubricant. The water-soluble salt coating acts as a carrier for the lubricant. In other words, this action draws the lubricant from the dry soap container box (dice box) into the die,
Provides lubricity. The water-soluble salt coating that dries on the steel wire has the property of drawing lubricant into the die, and conventionally coatings such as lime or sand have been used. Typical soluble salt compositions used to coat steel (usually stainless steel) wire include both sodium sulfate and sand. Using such a soluble salt composition, a coating with an excellent crystal structure is obtained, and when the coated steel wire is passed through a soapbox, good soap lubricant drawing properties are exhibited, resulting in excellent drawing properties. will be obtained.

[Problem to be Solved by the Invention J] However, when a wire coated with such a soluble salt coating agent is exposed to the outside air, especially when exposed to high humidity air,
It tends to absorb too much moisture. Such moisture absorption can seriously impede and sometimes even make the drawing process of the coated steel wire impossible. On the other hand, the use of soluble salt coatings with low moisture absorption results in coatings with almost no crystalline structure (i.e., non-quality or glassy type coatings), and both lubricant retraction and extraction properties are significantly reduced. become inferior.

The present invention improves such drawbacks and provides a uniform coating with excellent crystal structure, soap lubricant retraction and pullability, and at the same time low moisture absorption, i.e., low hygroscopicity, even on humid days. The aim is to provide a drug.

[Means for Solving the Problems] The newly discovered composition of the present invention is (1) a wire coating composition for facilitating cold drawing, which contains (a) as an active ingredient; K2S04 and/or Na2SO4 and? (1) Contains 95 to 99.99% by weight and 0.01 to 5% by weight of one or more alkaline soaps selected from the group consisting of potassium soap, ammonium soap, and sodium soap, respectively, and has a composition A composition in which the total amount of sodium ions in the product is 50% by weight or less of the sum of the total amount of potassium ions and the total amount of ammonium ions.

(2) A composition for coating a wire rod to facilitate cold drawing processing, which contains (a) K2SO4 and l or Na2SO4 as active ingredients, (a') K
2B4o7, Na2B407, KBO■ and NaBO2
one or more borates selected from the group consisting of borates and one or more alkaline soaps selected from the group consisting of lithium soap, ammonium soap, and sodium soap, each in an amount of 50 to 99. 98N
% by weight, 0.01-49.99% by weight and 0.01-5
% by weight, and the amount of total sodium ions in the composition is 50% by weight or less of the amount of total potassium ions and the amount of total ammonium ions.

That is, the composition of the present invention, which is in the form of a dry mixture prior to dilution with water for use, contains the following ingredients in the following amount ranges:

First invention: (a) K2SO4 and l or Na2S04 at 95 to 9
9.99% by weight, preferably 99.0-99.9% by weight
(1) 0.01 to 5% by weight, preferably 0.1 to 1.0% by weight of one or more alkaline soaps selected from the group consisting of potassium soap, ammonium soap, and sodium soap, where (a), (mouth) Maximum 50 of the sum of the amount of total potassium ions and the amount of total ammonium ions present in the ingredient
% by weight, preferably 10% by weight or less, is substituted with sodium ions, more preferably not substantially substituted with sodium ions.

Second invention: (a) K2SO4 and/or Na2S○4 at 50 to 9
9.98% by weight, preferably [7 or 70-89.9% by weight (
B') K2B407, Na2B4o7, KBO. and N
aBO2, 0.01 to 49.99% by weight, preferably 10 to 29.9% by weight, of one or more borates selected from the group consisting of aBO2.
9% by weight (by weight) of one or more alkaline soaps selected from the group consisting of potassium soap, ammonium soap and sodium soap, 0.01 to 5%, preferably 0.1 to 1.
0% by weight Here, (a) (1) The maximum amount of 50% of the sum of the total amount of potassium ions and the total amount of ammonium ions present in the component.
% by weight, preferably 10% by weight or less, is substituted with sodium ions, more preferably not substantially substituted with sodium ions.

Note that the second invention is obtained by replacing a part of the component (A) in the first invention with the component (A').

In both of the above inventions, those not substituted with sodium ions are preferred because the more sodium ions present, the higher the hygroscopicity becomes.

If sodium ions are present, (a), (i′)
) and the (oral) component, for example, the (oral) component may be partially or wholly a sodium soap.

Furthermore, component (a) and component l or (a') may be a sodium salt, a potassium salt, or a mixture of these salts. However, the above-mentioned limit on the total amount of sodium salt shall be maintained.

It is quite unexpected that the above composition imparts a good crystal structure when coated onto a steel wire. This is because the above-mentioned composition that does not contain (original) components imparts a non-uniform coating to the steel wire, and such coating is
This is because the soap lubricant has unsatisfactory retraction and extraction properties and is not useful as a coating agent. Although the mechanism is unknown, if the above soap is present, applying the above composition in the form of an aqueous solution to a steel wire, whether artificial or natural, causes it to become at least partially crystalline? Uniform/
A film with a clear texture can be obtained.

The K2SO4 used as component (a) may be chemically pure or industrially pure, but the latter is preferred from the cost standpoint.

K2B407 used as component (a') may be chemically pure or industrially pure, but it is generally commercially available as a tetrahydrate salt (K2B40 4 H20), and this invention also uses this K2B407. used in the form Similarly, K.B.
O2 can also be used as a (1) component, or K2
Although used as a mixture with B40■ in any proportion, this KBO2 may also be chemically pure or of industrial purity.

The above ammonium soap or potassium soap is C,2-C
2 ■ Ammonium salt or potassium salt of one or more fatty acids,
or an ammonium salt or a potassium salt of a mixture of two or more 01-1-022 fatty acids such as No. 22.

These fatty acids are generally saturated and linear, with ammonium stearate or potassium stearate being preferred for use in the present invention. 1) with one or two double bonds, unsaturated C2~C2■? Fatty acids can also be used alone or in admixture with each other and/or in admixture with saturated fatty acids. For example, ammonium or potassium soaps derived from fatty acid mixtures obtained by saponification of tallow oil, coconut oil, or mixtures thereof can be advantageously used as component (b). In addition, 0■2 containing some branched or alicyclic structures
~C2■ Fatty acid ammonium salt or potassium cum salt,
It can be used in the present invention alone or in combination with a linear fatty acid salt. Also, ammonium or potassium cum salts of rosin acids, such as abietic acid, can be used as (oral) ingredients.

The wire coated with the coating composition of the present invention is generally a steel wire, usually a stainless steel wire. However, other wire materials can also be coated with the coating composition of the present invention, including mild steel, titanium, vanadium, tungsten, aluminum, copper, nickel, zirconium, etc., and alloys thereof. . Coating the wire is carried out by bringing an aqueous solution of the invention's product into contact with the wire and drying the resulting wet coating, which may or may not be heated. be. The aqueous solution used in the present invention generally contains 75 to 400 g/l, preferably 150 to 250 g/l of the introduced product in water.
It contains.

Contacting the wire with the solution may be carried out in any convenient manner, either batchwise or continuously, and the resulting wet coated wire may then be dried before being stored, shipped, or placed in a die box (e.g.
The coated wire is drawn on conventional drawing equipment (using a conventional powdered soap lubricant). The coating on the wire acts as a carrier for the dry powder soap lubricant within the die.

The standard wire treatment process of the present invention is based on the following process, but the present invention is not limited to this process.

1. Cleaning of Wire Rods - Cleaning compositions are well known and do not constitute a component of the present invention.

2. Wash with water.

3. Pickling and pickling compositions are well known in the art, and the selection of the pickling composition is not part of the tI4 component of the present invention.

4. Wash with water.

5. Treatment with the coating composition of the invention as described above.

6. The wire is dried as described above to obtain the coated wire of the present invention.

This coated wire can be drawn as described above.

The water used to prepare the aqueous solution of the invention is preferably distilled or deionized water, but tap water may also be used if it is not too hard and has a low dissolved sodium salt content. is possible.

[Example J The present invention will be explained below with reference to Examples and Comparative Examples.
The invention is not limited to these examples.

A stainless steel panel was coated with an aqueous solution of a size smaller than a plate, and film morphology observation and hygroscopicity tests were conducted. Stainless steel panels were coated with each of the following compositions by immersing the panels in an aqueous solution, pulling the panels from the aqueous solution, and rapidly (air) drying the panels.

Comparative Example a) 187.2 g of a mixture of 75% by weight of Na2SO4 and 25% by weight of sodium tetraborate.IOH20 in 11 parts deionized water. Operating temperature 190°F (87°C)
.

Comparative example b) 75% by weight of K2SO per liter of deionized water
and K2B40.・4H2025% by weight mixture 187
．． 2 go operating temperature 190°F (87°C).

Comparative Example C) Addition of 5 g/i of sodium stearate to the aqueous solution prepared as in a). Operating temperature 190°F
Example 0 d) Addition of 5 g/l ammonium stearate to the aqueous solution prepared as in b). Operating temperature 190°
F0 The portion of the stainless steel panel coated with the above composition was then subjected to film morphology observation and a moisture absorption test. The test results are shown in Table 1 below. In Table 1, RH
means relative humidity.

Table 1: Average percentage of moisture in the coating. Moisture gain was determined by the weight difference between the uncoated panel and the coated panel before and after air exposure.

As can be seen from Table 1, the composition of the invention,
The composition yielded good crystallinity and low hygroscopicity.

This example shows the effect of the relative ratios of sodium and potassium on the hygroscopic properties of water-soluble salt coatings. An aqueous solution having the following composition as shown in Table 2 was used to coat stainless steel panels by the method of Example Co., Ltd. Note that Table 2 also shows the test results. Incidentally, in Table 2, M=molar concentration, ie, number of grams of moles per solution 11, and RH=relative humidity.

Example II1 The wood chip example shows the relative hygroscopicity of coatings and lime coatings from known sodium-based salt compositions and the low sodium salt compositions of the present invention. These coatings were coated on stainless steel wire samples using the following aqueous solution composition according to the method of Example Co., Ltd.

Comparative example j) 187.2 g of a mixture of 75% by weight of Na2SO4 and 25% by weight of sodium tetraborate/IOH20 in 11 parts of deionized water 0 Working temperature 190° F0 Example k) 479 parts by weight of K2S0 in 11 parts of deionized water, tetraboric acid Mixture of 20% by weight of sodium 10H2O and 1% by weight of ammonium stearate 187.2go Working temperature 190°F0 Comparative Example 1) 3% by weight of lime in deionized water. Operating temperature 19
0°Fo Comparative Example m) 6% by weight of lime in deionized water. Operating temperature 19
0°F.

Table 3 As can be seen from Table 3 above, the composition according to the invention c6k) had a significantly lower hygroscopicity compared to the lime coatings 1) and m).

Example ■ Ten different coating bath phase compositions were evaluated for moisture gain, film morphology, film uniformity, and number of crystals per inch using stainless steel panels.

These stainless steel panels were coated according to the method used in Example 2 with the coating composition and coating bath shown in Table 4. However, the wet coated panels were heat dried at 250'F (approximately 120C) for 10 minutes. The moisture increase rate is
Each was measured in a constant temperature room at a temperature of 80°F (27°C) and a humidity of 92%. Surtronic 3 surface brovirometer (Surtronic 3 surfac
epropb. The number of crystals per inch of coating was determined using a ylometer. Film properties and film appearance were determined visually.

In Table 4, the coating compositions S), L), and W) are:
a composition according to the invention, while n), 0), p),
Compositions q), r), U), and V) are comparative compositions. As can be seen from Table 4, compositions S), t), and W) produced uniform films and exhibited low hygroscopicity. Composition 0 was the only comparative composition that formed a uniform film, but it had high hygroscopicity and was not acceptable.

In fact, compositions n), 0), and p) all exhibited unacceptably high hygroscopicity and therefore poor wire drawability in humid environments. r) The coating composition is:
containing potassium sulfate and sodium stearate according to the invention, except that sodium stearate soap is present in excessive amounts, resulting in a non-uniform and largely glassy film; The wire drawing properties are not acceptable. A potassium salt composition according to the invention except that no soap is present.
), U), and (2) compositions result in unacceptably non-uniform coatings and, therefore, the wire drawing properties are inconsistent and unacceptable. Comparing the coating compositions 8), t), and W} of the present invention, the W) composition containing an alkali metal tetraborate salt had the highest crystallinity. Therefore, the presence of tetraborate in the coating compositions of the present invention, although optional, is highly preferred.

[Effects of the Invention] As can be seen from the above explanations and the results of comparative experiments, the composition of the present invention has a better crystal structure, soap lubricant drawing property, and drawing property compared to conventional compositions of this type. have,
It also has low hygroscopicity, making it extremely useful.

Claims (3)

[Claims] (1) A composition for coating a wire rod to facilitate cold drawing processing, the active ingredient being selected from the group consisting of (a) K_2SO_4 and/or Na_2SO_4 and (b) potassium soap, ammonium soap and sodium soap. The composition contains one or more alkaline soaps of 95 to 99.99% by weight and 0.01 to 5% by weight, respectively, based on the total amount of the ingredients, and the amount of total sodium ions in the composition is equal to the amount of total potassium ions. A composition in which the total amount of ammonium ions is 50% by weight or less. (2) A composition for coating a wire rod to facilitate cold drawing processing, which contains (a) K_2SO_4 and 1 or Na_2SO_4, (
A') K_2B_4O_7, Na_2B_4O_7, K
One or more borates selected from the group consisting of BO_2 and NaBO_2 and (b) one or more alkaline soaps selected from the group consisting of potassium soap, ammonium soap and sodium soap, each containing 50 to 99% of the total amount of the ingredients. .98% by weight, 0.01 to 49.99% by weight, and 0.01 to 5% by weight, and the amount of total sodium ions in the composition is the sum of the amount of total potassium ions and the total amount of ammonium ions. 50% or less by weight of the composition. (3) The composition according to claim 1 or 2, wherein the composition is an aqueous solution having a concentration of 70 to 400 g/l.