KR100434199B1 - Anti-corrosive epoxy coating composition containing lacquer - Google Patents

Abstract

The present invention relates to an anticorrosive and antimicrobial epoxy coating composition comprising a Lacquer component that is excellent in flame resistance, heat resistance, water resistance, antiseptic, insect repellency and insulation.

Epoxy coating composition according to the present invention is 2-80 parts by weight of the lacquer component (C) and 0-30 parts by weight of a lacquer drying agent, based on 100 parts by weight of the cured resin composition consisting of an epoxy resin (A) and an amine curing agent (B), And other additives, and are particularly useful for painting ships because of their excellent anticorrosive properties.

Description

Anti-corrosive epoxy coating composition containing lacquer

Conventionally, tar epoxy paints have been used as anticorrosive paints for ship structures. The paint is excellent in corrosion resistance, water resistance, chemical resistance, etc., but since it contains tar, it causes many problems such as environmental pollution as well as safety and hygiene problems caused by benzopyrene, a carcinogenic substance contained in this tar. .

In recent years, non-tar paints using petroleum resins instead of tars have also been developed. However, since the paints have problems in compatibility between epoxy resins and amine curing agents and petroleum resins, ships requiring particularly high corrosion resistance and water resistance are required. Not suitable for application in ballast tanks.

In addition, anticorrosive paints are generally coated on metal surfaces for rust prevention of metals. Such anticorrosive paints are anticorrosive pigments having anticorrosive effects such as chromate compounds such as zinc chromate and strontium chromate, cyanamide lead, zinc oxide, and podium. The use of a linking compound, such as basic chromate, has been a problem of pollution, and physical properties such as water resistance, adhesion to metal surfaces, and corrosion resistance are poor.

On the other hand, lacquer is derived from the sap of lacquer tree, which is a hardwood tree, and has been used to beautify and decorate the surface of wood such as boxes. In particular, lacquer is a kind of natural resin, it is known that not only has excellent flame resistance, heat resistance, water resistance, insulation, but also excellent antiseptic, insect repellent, and antibacterial properties. Lacquer is obtained by collecting the sap of lacquer and applying it to the surface of the adherend and drying it, it is well known that if the resources of the lacquer is secured, there are few problems such as causing pollution and it is environmentally friendly and good for health. (Refer to `` I agree with you '' and `` New Testament '' by Kim Il-hoon)

The present invention, in order to solve the problems of the conventional anticorrosive paint mentioned above, by introducing a natural or synthetic lacquer component to the epoxy paint instead of tar and rust preventive pigments, while maintaining compatibility with the epoxy resin and the amine curing agent, It is an object of the present invention to provide an epoxy coating composition which is free from problems and excellent in antibacterial, anticorrosive, adhesive, flame resistance, heat resistance and insulation.

According to the present invention, a certain amount of lacquer component is mixed with various epoxy resins and cured with various kinds of amine curing agents to obtain a desired coating composition.

The lacquer component used in the present invention is 50-85% lacquer acid, 3.5-10% rubbery, 1.5-3.5% nitrogen-containing substance, 10-40% water, in which the lacquer sap collected from natural lacquer is filtered to remove impurities. It refers to natural lacquer or synthetic lacquer containing.

The epoxy coating composition of the present invention consists of (A) epoxy resin, (B) amine-based curing agent, (C) lacquer component and (D) lacquer desiccant, if necessary, in addition to pigments, diluents, solvents and other desired paints. It may contain a conventional paint additive for imparting physical properties.

As for the quantity of the lacquer component (C) added with respect to 100 weight part of cured resin solid content which consists of the said epoxy resin (A) and an amine-type hardener (B), 2 to 80 weight part is preferable.

If necessary, the lacquer drying agent component (D) is contained, and the content thereof is preferably 0 to 30 parts by weight based on 100 parts by weight of the above cured resin solid content.

The epoxy resin (A) used in the present invention contains at least two or more epoxy groups in one molecule, and the epoxy equivalent is suitably 150-600, preferably 150-300. Examples of such epoxy resins include conventionally known ones such as bisphenol type epoxy resins, aliphatic epoxy resins, glycidyl ester epoxy resins, glycidyl amine epoxy resins, phenol block type epoxy resins, and cresol type epoxy resins. These epoxy resins may be used alone or in combination of two or more thereof.

As an amine hardening | curing agent (B) used by this invention, a conventionally well-known hardening | curing agent for epoxy resins, for example, metha xylenediamine, isoprondiamine, diethylenetriamine, triethylenetetramine, diaminodiphenylmethane, etc. Aliphatic polyamines, aliphatic cyclic polyamines, aromatic polyamines, epoxy resin adducts of the above polyamines, polyamideamines, polyamide resins, and the like, and the like, and these may be used alone or in combination of two or more thereof.

Although the mixing ratio of the said (A) component and (B) component is suitably selected according to the kind of two components used, Usually, the equivalence ratio of [active hydrogen equivalent in (B) component / epoxy equivalent in (A) component] is 0.5. It is preferable to exist in the range of -1.0.

Examples of the lacquer desiccant used as the component (D) include beeswax, spirits, glycerin, ammonium acetate solution, copper ammonia double salt, chromium trioxide and the like.

In addition, additives for conventional paints, such as extender pigments and colored pigments, reactive diluents, organic solvents, antisettling agents, thickeners, wetting agents, reaction promoters, tackifiers, and dehydrating agents, as necessary for the composition of the present invention. May be added as appropriate.

In addition, the lacquer-containing epoxy coating composition according to the present invention has excellent compatibility between the epoxy resin, the amine-based curing agent, and the lacquer component, and thus does not require any additional equipment or process in the manufacture of the product. It is possible to provide a coating composition having excellent properties.

(Example)

The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to these examples.

Example 1 Preparation of Epoxy Paint Composition

To 100 parts by weight of epoxy resin (epoxy equivalent 175), 50 parts by weight of titanium oxide, 70 parts by weight of talc, 10 parts by weight of xylene resin, 10 parts by weight of xylene, 10 parts by weight of thickener, and 5 parts by weight of a desiccant are added, stirred and dispersed. Then, 30 parts by weight of an amine curing agent was added thereto immediately before coating, mixed, and stirred to obtain an epoxy paint.

To the obtained epoxy paint, the lacquer component was added with 0 (control), 5 and 10 parts by weight in the form of natural lacquer to obtain respective paints, and coated on a glass plate with a thickness of 5 microns or 20 microns for 24 hours at room temperature. It was dried or dried by heating at a high temperature of 200 ° C.

Example 2: Performance Test of Coating Film

Glossiness and appearance were visually tested.

According to the test method of KS B0812 and ISO 1520, CET was subjected to deformation by using an Erichsen Cupping tester to check the cross-cut section of the checkered pattern to determine the degree of peeling of the film by using a cellophane tape.

Impact resistance test was tested according to the test method of SH-S-2-0003, ASTM D2794 or JIS K5400. That is, after peeling off a blade site | part with a cellophane tape by applying an impact, the peeling degree of a coating film was determined. The criteria for evaluation are as follows.

*Criteria

grade Park Lee Jung Dildo 5 No cracks on the impacted part 4 Slight cracking but no peeling 3 Cracks occur and film peeling is within 5% of the total area 2 Cracks occur and film peeling is within 5-15% of the total area One When cracking occurs and film peeling is more than 15% of total area

The performance and physical property test results of the coating film are shown in the following table.

dry Room temperature drying (24 hours) Room temperature drying (24 hours) Heat drying (200 ℃) Coating thickness (㎛) 5 20 20 Lacquer content (part by weight) 0 5 10 0 5 10 0 5 10 Glossiness 128 124 97 139 124 82 137 116 19 Exterior Good Good Good Good Fine particles Good Good Good Good CET (%) 5 5 10 15 30 50 20 50 50 Impact strength 5 5 5 5 5 5 5 5 5 MEK 7 4 3 15 3 5 15 7 25 Coin scratch - - - △ X X 0 0 0

As shown from the experimental results of the above embodiment, the lacquer component-containing epoxy coating composition according to the present invention can be economically manufactured using the existing production facilities and production systems as it is, and superior physical properties compared to the conventional epoxy coating composition Since it is, it is useful as a marine paint which requires high corrosion resistance and water resistance.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, and such modifications and modifications belong to the appended claims. .

Claims (5)

100 parts by weight of a cured resin solid content consisting of an epoxy resin (A) and an amine curing agent (B) and 2 to 80 parts by weight of a lacquer component (C), The equivalence ratio of the said (A) component and (B) component [the active hydrogen equivalent in (B) component / epoxy equivalent in (A) component] exists in the range of 0.5-1.0, Here, the epoxy resin (A) is a bisphenol-type epoxy resin, an aliphatic epoxy resin, a glycidyl ester epoxy resin, glycine containing at least two epoxy groups in one molecule, the epoxy equivalent of 150-600 At least one selected from the group consisting of a diamine amine epoxy resin, a phenol block epoxy resin and a cresol epoxy resin is mixed, The amine-based curing agent (B) is a mixture of at least one selected from the group consisting of aliphatic polyamines, aliphatic ring polyamines, aromatic polyamines, epoxy resin adducts of the polyamines, polyamideamines and polyamide resins, The lacquer component (C) is an epoxy coating composition, characterized in that it contains 50-85% lactate, 3.5-10% rubbery, 1.5-3.5% nitrogen-containing material, 10-40% moisture. The epoxy coating composition according to claim 1, further comprising at least 30 parts by weight of at least one component selected from the group consisting of beeswax, spirits, glycerin, ammonium acetate solution, copper ammonia double salt and chromium trioxide. . delete delete The at least one component according to claim 1 or 2 selected from the group consisting of pigments such as extender pigments and colored pigments, reactive diluents, organic solvents, sedimentation inhibitors, thickeners, wetting agents, reaction promoters, adhesion imparting agents, and dehydrating agents. The epoxy coating composition which is further contained.