JPS62254918A - Manufacture of wire rod having lime film - Google Patents

Abstract

PURPOSE:To make no lime to fall while under the transportation and at wire drawing time and prevent the reduction in the carrier effect and pollution of the working environment, etc. by sticking the mixture liquid of a bentonite and hydrate magnesium silicate or talc and a limemilk to a wire rod. CONSTITUTION:A lime mixture liquid is made by blending to a limemilk a bentonite and hydrate magnesium silicate or talc. The bentonite added to the limemilk is preferably that of Na group from the viewpoint of a swelling, a Na group bentonite is added in 0.1-0.2 weight part for the total weight of the lime mixture liquid, a hydrate magnesium silicate or talc is added in 0.1-0.5 weight part and subjected to a suspension with agitation. The concentration may be adjusted adequately according to the use purpose and by sticking this lime mixture liquid to the wire rod the lime film having excellent smoothness, absorptivity and stick-tendency is obtd. and the lubrication effect at wire drawing time is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a wire rod having a lime coating, and more particularly to a method for manufacturing a wire rod having a lime coating with excellent adhesion and subjected to wire drawing.

A wire rod is a long, slender steel bar that is made into a wire by wire drawing, and is produced from a steel ingot by hot rolling. When wire drawing is performed using such a wire, it is necessary to provide a lubricant between the wire and the die.

In order to supply such a lubricant between the wire rod and the die, it has conventionally been possible to spread lime or lime soap solution on the wire surface as a pretreatment during wire drawing to form a lime film on the wire surface. The carrier action of the coating transports the lubricant to the wire surface, thereby improving the workability and quality of the wire drawing process. To form such a reaction film, burnt lime and soap are mixed, water is added to generate heat, the resulting milk of lime is diluted to an appropriate concentration, a wire is immersed in this, and the wire is dried. is taken.

However, the lime coating produced by such conventional methods has low adhesion to the wire rod, and lime falls off from the wire surface due to vibrations during transportation and wire drawing, which reduces the carrier effect for lubricants and creates lime dust, which creates a problem in the working environment. There is a high risk of causing contamination. In addition, "uneven dripping" occurs when immersed in lime liquid, and the uniformity of the carrier effect is not sufficient.

Furthermore, the lubrication effect during wire drawing is still not sufficient.

Means for Solving the Problems The present inventors conducted various studies to solve the above problems, and found that bentonite is effective in forming a preferable lime film on the wire, and hydrous magnesium silicate or talc has good lubricity. The present inventors have discovered that the present invention is excellent as a promoting aid for the following. The present invention provides a method for producing a wire rod having a lime coating, which is characterized by adhering to a wire rod a lime mixture containing lime emulsion, bentonite, and hydrated magnesium silicate or talc.
Bentonite, especially Na-based bentonite, has excellent swelling properties, spreading viscosity, and adsorption properties, and hydrous magnesium silicate and talc both have excellent smoothness, absorption properties, and adhesion properties, making them difficult to use during wire drawing. Improve the lubrication effect of.

It has been found that by adding such Na-based bentonite and hydrated magnesium silicate or talc to lime for surface treatment during wire drawing or to an aqueous lime soap solution, an extremely excellent lime film can be formed on the wire surface.

Next, the present invention will be explained in more detail.

The lime mixture used in the production method of the present invention is prepared by blending milk of lime with bentonite and hydrous magnesium silicate or talc.

The quicklime used as a raw material for the milk of lime is roasted dense amorphous limestone with few impurities. For example, J.I.
Particularly preferred is reclaimed limestone as defined in S-9001.

The bentonite added to the milk of lime is preferably Na-based bentonite from the viewpoint of swelling properties, and preferably a powdered product having a mesh size of 300 mesh or less.

On the other hand, the talc to be added together with bentonite is preferably a white product containing hydrated magnesium silicate as a main component, which is soft and has good adhesion and smoothness, and preferably a powdery product having a mesh size of 300 mesh or less.

Furthermore, hydrated magnesium silicate may be used instead of talc.

Next, a method for producing a lime mixture using quicklime, bentonite, and hydrated magnesium silicate or talc will be described.

An appropriate amount of water is added to 1 to 20 parts of Na-based bentonite and 1 to 5 parts of hydrated magnesium silicate or talc per 100 parts of quicklime, and the mixture is stirred and suspended. The temperature of the mixed liquid becomes 150° C. or higher due to an exothermic reaction. After the reaction is completed, 2 to 3 times more water is added to prepare a lime emulsion, which is left for several days. During this time, the lime emulsion becomes fine particles of about 0.1 to 0.2 μm, and the bentonite, hydrated magnesium silicate, or talc particles uniformly swell, increase in viscosity, and are suspended in the emulsion, forming a paste-like state. present. In order to uniformly form fine lime particles, the lime mixed aqueous solution is further filtered using a suitable cloth or fine wire mesh to refine the coarse particles.

Further, the concentration may be adjusted to an appropriate concentration depending on the purpose of use. For example, when lubricity is important, it is preferable to use a high concentration liquid, while when the objective is a glossy finish, it is preferable to use a low concentration liquid. It is desirable to constantly stir the lime mixture in the lime tank in order to prevent precipitation of lime, bentonite, and hydrated magnesium silicate or talc in the tank, and to form a uniform film on the surface of the wire. Although the buffering power of the mixed solution against acids is large, if a large amount of acidic solution is mixed at once, it will affect the composition and stability of lime, bentonite, and hydrous magnesium silicate or talc solution.
The iron content increases and causes rusting of the wire. For this reason, sufficient water washing is desirable during pickling.

The lime mixture causes foaming at about 10% by weight of bentonite and hydrated magnesium silicate or talc in the lime solution. Foaming of the lime liquid forms a foam film on the surface of the wire rod, which inhibits the ability of the lime film to spread uniformly and makes it easy to fall off, so it is necessary to remove the foam. The quality of the lime film is expressed by the proportion of calcium hydroxide covering the wire, and exhibits remarkable adhesion when the covered surface area per constant lime weight is 8000 cx2/g or more.

In addition, in order to achieve a synergistic effect between lime surface film properties, film-forming properties, and spreading properties, water-soluble edible resins made of natural polysaccharides such as glucose, water-soluble polyvinyl alcohol, and carboxymethyl cellulose (CMC) are used to strengthen the It may be added in combination as a film formation promoter.

Forming a lime film on the wire using the lime mixture thus obtained may be carried out by a known method, for example, the wire is immersed in the lime mixture and dried by an appropriate method.

Effects of the Invention According to the manufacturing method of the present invention, it is possible to prevent uneven dripping and uniform surface adhesion when the reaction liquid is attached to the wire, further accelerate drying, strengthen the spreading film surface, improve rust prevention ability, and improve lime It shows remarkable effects in improving the working environment by preventing dust generation.

cold nose carp Next, the present invention will be explained in more detail using Examples.

Example 1 Next, a lime mixture was prepared using quicklime, bentonite, and hydrated magnesium silicate or talc.

Quicklime: JIS R-9001 Bentonite: ■) Production area: Manufactured by Sanritsu Shugyo Co., Ltd., 486 Iriyama, Matsuida-cho, Usui-gun, Gunma Prefecture (variety 300-3S-B) 2) Quality characteristics Moisture (%) 90% or less Standard Setsubun residue% 300 mesh 2.0% or less bulk specific gravity
g/cc 0.45-0.5g viscosity (8% dispersion)
24.2 pH (1% dispersion) 9.6-1083 degree of swelling (9/
g24hs) 6.0-7.0 (usually 6.6) Methylene Prue sorption amount CIIQ) 28 cation conversion capacity (mcq/100g) 65-553) Chemical component analysis (%) SiOt 64, 5-68.0Δ (
12o* 13.0~I 5. OPe,
'3 3.0-5.0CaO0,5-2.0 Mg0 1.0-2.5, OO,4
~0.5 NatO1,5-2. Oig-Loss (HtO) 7.0-9.0 Talc (manufactured by Nippon Talc Co., Ltd., MS-P) 2) Quality characteristics Whiteness (%) 95-99 (Digital Hunter whiteness meter) Powderness 300 mesh (1'yler standard section JIS K-5101) Moisture (
%) 0.1 to 0.5 (JIS K-51
01) ptI (1% dispersion) 8,0-1010 (JIS
K-5101B method) 3) Chemical component analysis (%) SiOx 62.75 Mg0 31.16 AI2tCh 0, 21PeyO*
0.61 CaOO,15 Loss on ignition 4.83 1.0% Na-based bentonite based on total weight, and 0
．． Add 2% hydrated magnesium silicate or talc,
Stir thoroughly to suspend. When adding bentonite, hydrated magnesium silicate, or talc, if stirring and dispersion is insufficient or if too much is added, particle beads will occur. Therefore, add water little by little while stirring to prepare a lime mixture. do.

In addition, water-soluble polyvinyl alcohol (Unitika Range U)
MR-20M Unitika Kasei Co., Ltd.) 200-2,
0009 is added to prepare a lime mixture.

Next, a wire rod was immersed in the obtained lime mixture, taken out, and air-dried to obtain a wire rod that suppressed uneven sagging, had a uniform surface, and had a good lime film without uneven adhesion of lime particles.

The obtained wire rod had characteristics similar to that of a rod.

(a) In contrast to the conventional product, where the lime can be removed by rubbing lightly with the hands, the adhesion of the wire rod obtained in Example 1 has been improved to such an extent that it cannot be removed without strong rubbing with the hands.

(b) Because of the good adhesion of lime, the yield was high and even if the concentration of lime was reduced to 1/2, it was possible to draw the wire in the same manner as before.

(c) As described above, due to the good adhesion, the surface of the wire drawing finish is beautiful, and the falling off of lime is reduced, which significantly improves the environment of the wire drawing factory.

Claims (4)

[Claims] (1) A method for producing a wire rod having a lime coating, which comprises adhering to the wire a lime mixture containing lime emulsion, bentonite, and hydrated magnesium silicate or talc. (2) 0.1 to 2.0 parts by weight of Na-based bentonite and 0.1 to 0.5 parts by weight of hydrated magnesium silicate or talc are added to the total weight of the lime mixture.
) Manufacturing method. (3) The method according to item (1) above, wherein the lime coating made of slaked lime has a covering surface area per constant lime weight of 8000 cm^2/g or more. (4) The method according to item (1) above, wherein the lime mixture contains one or more compounds selected from the group of compounds consisting of water-soluble polymers and natural polysaccharides.