KR970001007B1 - Organic inorganic compound solution for manufacturing plastic steel sheet - Google Patents

Abstract

Preparing method of an organic or inorganic resin solution for coating a chromate-treated steel sheet surface is described. Thus, 10-20 wt. % of water soluble acryl resin is heated with 5-20 wt.% of silica sol at 80-90 deg.C for 15 min and added with 0.5-2.0 wt.% of silane compound and 0.001-1.0 wt.% of metalic salt at room temperature for 5 hr. One of Co-naphthenate, CoSO4, CoCl2., CuSO4, Cu(OH)2, Cu(Cl)2, FeSO4, NiCl2, and NiSO4 uses as a metal salt. The resin solution has a good corrosion resistance, antidactylographic and weldability.

Description

Organic and inorganic composite resin solution for producing resin steel sheet with excellent corrosion resistance, fingerprint resistance and volume

The present invention relates to a container for manufacturing a resin steel sheet, an inorganic composite resin solution, and more particularly, to an upper layer of a chromate-plated zinc plated steel sheet, which is excellent in corrosion resistance, fingerprint resistance and adhesion when organic and inorganic composite resin coating is performed. The present invention relates to an organic-inorganic composite resin treatment solution having improved weldability.

In general, the organic and inorganic composite resin treatment is coated with water-soluble organic and inorganic composite resins after chromate treatment during post-treatment of galvanized steel sheet and then dried. In order to ensure and also increase the corrosion resistance by the coating of the fingerprint resin. In other words, a galvanized steel sheet subjected to a conventional chromate treatment is formed on the upper layer of the anti-fingerprint, which is a composite resin of organic and inorganic resins, and has a complex structure of a chromate coating on the lower layer and a resin coating on the upper layer. Accordingly, the lower layer exhibits better corrosion resistance than the chromate treatment itself due to the anticorrosive effect of the chromate layer and the corrosion barrier effect of the upper resin film. In addition, the lower chromate layer contributes to the increase in corrosion resistance along with the organic and inorganic composite resin layers, and also has the effect of improving the adhesion between the galvanized steel sheet and the resin.

On the other hand, the organic and inorganic composite resin solution used in the organic and inorganic composite resin treatment is a silicone resin containing a silicon compound and consists of silicon, oxygen and organic functional groups, and water-soluble acrylic emulsion and epoxy curing agent are used therein. Looking at the conventional organic and inorganic composite resin solution related to this, a method for producing a mixture of acrylic emulsion, silica sol and chromium solution in wet or dry state for galvanized steel sheet is given in Japanese Patent Application Laid-Open No. 3-215681 and No. 3-215682. In addition, a mixture of epoxy resin, acrylic, polyester or phenol resin for increasing the corrosion resistance is given in Japanese Patent Application Laid-Open No. 55-51032, and a method of coating with a water-soluble acrylic resin is disclosed in Japanese Patent Application Laid-Open No. 58-22417.

The prior art mainly contributes to the improvement of corrosion resistance mainly by using water-soluble acrylic resins, epoxy resins, and silica sol in the form of SiO ₂ .

In addition, there is a method for improving the adhesive strength of a steel sheet by adding an exemplary compound as a compound of an organic functional group having a structure of R-Si- (OR) ₂ to the cured plastic, and as a representative example, German Patent No. 2,153,357 And U.S. Patent 4,146,585.

That is, a method of improving the adhesive ability by using an adhesive of a polyester compound using a silane compound has been proposed in German Patent No. 2,153,357, and according to US Patent No. 4,146,585, a silane contained in vinyl paint is proposed. The use of a compound has been proposed to improve the adhesion upon coating as well as to improve gloss and outdoor exposure.

However, the composite-structured steel sheet thus treated shows excellent effects in corrosion resistance and fingerprint resistance when a certain thickness of the film is formed by organic and inorganic composite coatings, but is adversely affected when welding after cutting to process the steel sheet. Will be shown.

Therefore, the present invention has been proposed to solve the above problems, by adding a metal salt to the water-soluble acrylic resin, silica sol and selenium compound used in the past to have an organic binding composition while intrinsic fingerprinting properties of the resin film of the chromate treatment material The purpose of the present invention is to provide an organic inorganic composite resin solution for producing resin piercing, which is particularly excellent in weldability as well as improving corrosion resistance and adhesion.

Hereinafter, the present invention will be described.

The present invention is a weight percent, water-soluble acrylic resin: 10 to 20%, silane compound: 0.5 to 2.0%, metal salt: 0.001 to 1.0%, silica sol: 5 to 20% and residual pure water composed of corrosion resistance, fingerprint resistance and The present invention relates to an organic and inorganic composite resin solution for producing resin steel sheet having excellent weldability.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The water-soluble acrylic resin emulsion contributes to corrosion resistance and fingerprint resistance as a component constituting the main component of the coating on the plating layer. Acrylic resins used in the present invention may include acrylic acid, methacrylic acid or esters of these acids or copolymers of acrylonitrile, and these may contain one or two or more kinds thereof. It is okay to be.

The acrylic resin is preferably contained in the total content of the total aqueous solution in the range of 10 to 20% by weight (hereinafter referred to as only%), because the water-soluble resin content is less than 10% in the exclusive solution, the corrosion resistance of the desired physical properties And low tomonium content, the content of more than 20% not only has a problem in the stability of the solution due to the acceleration of the curing reaction of the resin, but also unevenly applied on the steel sheet due to the increase in the viscosity of the solution itself, so that the variation in adhesion amount is large Or the solids are adsorbed on the work roll of the ROL-coater, thereby degrading workability.

Moreover, the said silane compound (silane coupling agent) is characterized by having two or more types of different reactors in a molecule as organosilicon carbon monomer. That is, since the hydrolyzable functional group has a property of binding to an inorganic adhesive (glass, silica, metal, clay, etc.) and the other functional group has a property of binding to an organic material, the silane coupling agent is an interface between the inorganic and the organic material. It acts as a crosslinking agent in. In the present invention, as the silane coupling agent, 3-aminopropyltriethoxy silane (3-Aminopropyltriethoxysilane), 3-glycidoxylpropyltrietho xysilane, 3- (trimethoxy silyl) Propyl methacrylate [3 (trimethoxy silly) prolpylmethacrylate] and N (2-aminoethyl) 3-aminopropyl trimethoxy silane [N (2-Aminoethyl) 3-aminopropyltrimethoxysilane], and the like. You may add it above. However, when the content of the silane compound in the resin solution is less than 0.5%, its effect is insufficient, and when increasing to 2% or more, the solution itself is cured after 24 hours after the preparation of the solution and applied when the resin is applied. It is preferable to limit the content of the silane compound to the range of 0.5 to 2% because the form is uneven and streaks, but also partly remains in the solution and there is a problem in workability. In addition, the silica sol is an important component added to improve corrosion resistance not only to the fingerprint solution itself but also to the chromate solution, and in the case of the present invention, the content is preferably limited to 5 to 20%, because the silica sol If the content is less than 5%, the effect of improving the corrosion resistance is insufficient. If the content is more than 20%, it is not preferable because it promotes the gelation reaction due to the increase of solid content in the solution. In particular, the present invention adds a metal salt to improve the weldability of the organic and inorganic composite resin coating, the metal salt retains excellent conductivity of the metal component itself after the formation of the coating, which makes welding difficult due to the resin coating itself during processing. It enables welding to the extent. The present invention can be used a variety of metal salts as the weldability improving element, but according to the results obtained through experiments, in the compatibility with the acrylic resin Co-naphthenate (Co-naphthenate), CoSO ₄ , CoCl ₂ , CuSO ₄ , Cu (OH) ₂ , CuCl, FeSO ₄ , NiCl ₂ , NiSO _4, and the like are preferable, and among these, it is more preferable to add one of the group consisting of Co-naphthenate, Cu (OH) 2 and CuCl. . Hereinafter, the present invention will be described in detail through examples.

Example

After mixing water-soluble acrylic and silica sol to have a composition as shown in Table 1, and then heated to 80 ~ 90 ℃ for about 15 minutes, and then added the silane compound, then the metal salt is dissolved in water in powder form and mixed for 5 hours at room temperature The above solution was stirred to prepare a resin solution.

The resin solution having the composition shown in Table 1 above was equipped with a pick-up roll and an applicator roll on a chromate-treated steel sheet having an electro zinc plating amount of 40 g / m 2, a chromate amount of 10-15 mg / m 2, and a size of 70 × 100 mm. After using a roll-coater to apply a resin adhesion amount as shown in Table 2, and then dried for about 8 seconds at a maximum hot air temperature of 250 ℃, evaluating the quality characteristics of the anti-fingerprint coating on the dried specimens, and the results Table 2 shows.

At this time, the quality characteristics of the anti-fingerprint coating are carried out for corrosion resistance, paintability, anti-fingerprint resistance, degreasing resistance, resin adhesion amount, weldability, and surface appearance, and the corrosion resistance is 1.1 kg / cm 2, spray amount at a temperature of 35 ° C. Salt spray test results were used under the condition of 0.5ml / Hr / 8㎠, and the coating property was evaluated by applying a melamine alkyd baking paint having a coating thickness of 30 μm, and then applying a 1 mm × 1 mm, 100/100 check board. It was carried out by graduation test.

In addition, the anti-fingerprint was evaluated by measuring the color difference of the surface of the steel sheet after the application of white wasserine, the degreasing resistance (solvent resistance) is a degreasing solution of pyroclean 442 (Pyroclean 442, trade name) 0.7 at a temperature of 50 ℃ Evaluation by alkali resistance evaluation and ultrasonic degreasing by spraying kg / ㎠, the surface resin adhesion was evaluated by peeling the resin film with diluted hydrochloric acid of 1: 3 and then measuring the film weight.

As shown in Table 2, in the case of Inventive Example (1-27) using the resin solution formulated in the condition range of the present invention, Comparative Example (28-36) using the resin solution formulated outside the condition range of the present invention. Compared to the case, the corrosion resistance, rubbing resistance, solvent resistance, paintability, and surface appearance are not only excellent, but in particular, it can be seen that there is a significant difference in weldability.

As described above, when the resin solution according to the present invention is applied to the chromate treatment material, it is possible to provide a resin steel sheet which not only ensures fingerprint resistance but also improves corrosion resistance and adhesion, and in particular, weldability is excellent.

Claims (2)

By weight, water-soluble acrylic resin: 10-20%, silane compound: 0.5-2.0%, metal salt: 0.001-1.0%, silica sol: 5-20% and the balance of pure water, Organic and inorganic composite resin solution for manufacturing resin steel with excellent weldability. The resin solution of claim 1, wherein the metal salt is one selected from the group consisting of Co-naphthenate, CoSO ₄ , CoCl 2, CuSO 4, Cu (OH) ₂ , CuCl, FeSO ₄ , NiCl _2, and NiSO ₄ . .