KR20170100088A

KR20170100088A - Ceramic Coating Composition and Methode of Ceramic Coating on plastic

Info

Publication number: KR20170100088A
Application number: KR1020160021860A
Authority: KR
Inventors: 장재봉
Original assignee: (주)네오플램
Priority date: 2016-02-24
Filing date: 2016-02-24
Publication date: 2017-09-04

Abstract

The present invention relates to a ceramic coating composition and a coating method for plastic kitchen containers, comprising 10 to 70 parts by weight of silica sol, 5 to 60 parts by weight of silane, 5 to 25 parts by weight of water, 5 to 20 parts by weight of ceramic additive, 10 to 70 parts by weight of silica sol, 5 to 60 parts by weight of silane, 5 to 30 parts by weight of water, 1 to 10 parts by weight of a functional additive, 5 to 30 parts by weight of a solvent, 40 parts by weight of a top coat agent; The present invention relates to a ceramic coating composition for a plastic kitchen container and a ceramic coating method for the plastic kitchen container using the same.

Description

Technical Field [0001] The present invention relates to a ceramic coating composition for a plastic kitchen container,

Currently, plastic containers used in kitchen containers have many advantages such as ease of use and economical efficiency. However, the biggest disadvantages are 'surface scratches', 'dissolving harmful substances in high heat' or 'discoloration and discoloration' in ultraviolet rays There is a problem such as coloring and smelling in storage. In particular, in the case of melamine resin, heat is strong, but when it is used in high temperature or microwave oven, harmful substances may be generated, and it is weak in scratches, resulting in cosmetic problems such as color, There is a problem that harmful substances can come out.

On the other hand, ceramics or glass containers have a disadvantage that they are strong in surface, can be used even in high heat, have little odor and color penetration, are fragile, heavy in weight and relatively expensive.

In view of these problems, attempts have recently been made to coat ceramics with various plastic containers containing melamine resin.

In general, inorganic coatings and inorganic ceramic coating compositions used for coating ceramics have physical properties such as heat resistance, weatherability, stain resistance, chemical resistance, and durability that are comparable to those of an organic coating or an organic coating composition, Has a falling problem. On the other hand, the conventional fluororesin (PTFE) coating composition has a problem in that the coating film has excellent non-stickiness while the physical properties such as adhesiveness, hardness, salt water resistance, chemical resistance and durability are remarkably lower than those of the ceramic coating film.

In order to solve such a problem, a method of producing a plastic molding having a ceramic coating layer and a plastic molding (Korean Patent Laid-Open No. 10-2006-0119037) disclosed in Patent Document 1 discloses a method of forming a base material made of plastic Forming a ceramic coating layer on the surface of the base material and coating the surface of the ceramic coating layer with a metal oxide by an electrophoresis method to form an antifouling layer, Is disclosed.

However, since the conventional method has to go through complicated processes such as electrophoresis, it has a problem that the manufacturing method is complicated, the cost is increased, and the fabrication efficiency is extremely low.

Patent Document 1:

Disclosure of the Invention The present invention has been made to solve the above-mentioned problems of the prior arts, and it is an object of the present invention to provide a ceramic container which is capable of forming a ceramic coating as a ceramic component firmly and easily in a plastic container, To be improved.

In order to achieve the above object, the ceramic coating composition of the plastic kitchen container of the present invention comprises 10 to 70 parts by weight of silica sol, 5 to 60 parts by weight of silane, 5 to 25 parts by weight of water, 5 to 20 parts by weight of ceramic additive, 10 to 70 parts by weight of silica sol, 5 to 60 parts by weight of silane, 5 to 30 parts by weight of water, 1 to 10 parts by weight of a functional additive, , 5 to 40 parts by weight of a solvent; And a control unit.

Also, the silane may include 2 to 50 parts by weight of an organoalkoxysilane in 100 parts by weight of the silane, wherein one of the silanes is selected from the group consisting of mrthyl, ethyl, Or an organic radical selected from the group consisting of a propyl group and a propyl group.

In addition, the functional additive is characterized by comprising at least one of FAS (fluoroalkoxysilane) or PDMS (polydimethylsiloxane) for securing non-tackiness.

Meanwhile, a ceramic coating method of a plastic kitchen container according to an embodiment of the present invention is a ceramic coating method of a plastic kitchen container using a ceramic coating composition of the plastic kitchen container, (S3) of cleaning the surface of the plastic (S4); (S4) preheating the surface of the plastic container; (S5) applying the undercoating agent to the surface of the container; and applying the topcoating agent onto the undercoating film coated with the undercoating agent. A step (S6) of applying the upper coating agent in a wet-on-wet manner, and a step (S7) of heat-treating the upper coating film coated with the upper coating agent while drying the coating film .

In addition, the undercoating agent and the topcoating agent may be separately provided as separate components, and may be a pre-mixing rolling step in which the silica sol is sufficiently dispersed, a mixing step of mixing the dispersed silica sol and the other components ; Rolling the mixed mixture for a predetermined time, aging and filtering; (S5) of applying the undercoating agent, and (S6) applying the overcoat agent.

According to the present invention, it is possible to prevent surface wounds, increase convenience in washing and moving, and can use a wool cloth, a styrofoam, etc., , It is advantageous to maintain durability and product value because it can maintain a new product form for a long time, and it is possible to prevent hygiene and food stability from being infiltrated into the wound portion.

In addition, it can inhibit discoloration when exposed to heat and sunlight, and can prevent the dissolution of harmful substances in long-term storage of heat and strongly acidic food, and can directly contact food, , It emits anion and far-infrared rays which are beneficial to the human body, and thus it is possible to secure hygiene and food stability.

On the other hand, it is possible to prevent product deformation and cracking from direct contact with chemical solvents (benzene, acetone, alcohol, toluene, etc.), and also to suppress the toxic gas emission according to flame retardancy in direct contact with fire and fire .

In addition, it can contain an organic alkoxysilane, which can be a kind of coupling agent, so that an organic component of a plastic and a ceramic component of an inorganic component can be efficiently combined to maximize film strength and fixability, The food is not easily adhered even when heated.

Fig. 1 is a schematic diagram showing a static dispersion state due to an electrical repulsive force of silica sol particles in a steady state. Fig.
2 is a schematic diagram showing a bonding process by reaction of an organic alkoxysilane and a colloidal silica sol.
3 is a flow chart illustrating a ceramic coating method of a plastic kitchen container according to an embodiment of the present invention.
4 is a cross-sectional view illustrating a coating layer to which a ceramic coating method of a plastic kitchen container according to an embodiment of the present invention is applied.

Hereinafter, a ceramic coating composition and a coating method of a plastic kitchen container according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts are denoted by the same reference numerals whenever possible. In describing the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

The ceramic coating composition of the plastic kitchen container of the present invention is largely composed of an undercoating agent and an overcoating agent.

In this case, the undercoating agent is a mixture of 10 to 70 parts by weight of silica sol, 5 to 60 parts by weight of silane, 5 to 25 parts by weight of water, 5 to 20 parts by weight of ceramic additive, 5 to 25 parts by weight of pigment and 5 to 30 parts by weight of solvent . The top coat agent comprises 10 to 70 parts by weight of silica sol, 5 to 60 parts by weight of silane, 5 to 30 parts by weight of water, 1 to 10 parts by weight of a functional additive and 5 to 40 parts by weight of a solvent.

On the other hand, silica sol usually repels each other due to a hydroxyl group charged with a negative charge as shown in Fig. 1 and forms a static dispersion state. This results in a property that the silica sol is hardly fused to the surface of an organic material plastic do.

In this case, when an organoalkoxysilane constituted by replacing one chain of the silane with an organic radical is added, as shown in FIG. 2, the silica serving as an inorganic component on one side and the organic radical . Therefore, it is possible to have a function of allowing the silica sol, which is inorganic, to be easily fused to an organic plastic. Therefore, it is preferable that the silane contained in the undercoating agent or the top coat agent contains 2 to 50 parts by weight of organoalkoxysilane in 100 parts by weight of the silane.

Examples of the organic alkoxysilane compounds that can be used in the present invention include methyltrimethoxysilane, ethyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, phenyltrimethoxy Silane, diphenyldimethoxysilane, etc. These may be used alone or in combination of two or more. The functional groups R and R 'are preferably an alkyl group having 1 to 5 carbon atoms, an acyl group or a phenyl group, and n is 2 to 3. The organic alkoxysilane compound is represented by R-Si (OR') n. According to the present invention, when the functional group of the silane compound is larger than 3, hydrolysis rate is lowered due to mutual disturbance of large functional groups during the aging process, and gelation tends to occur, which may adversely affect the stability of the product. It is advantageous to use silane compounds. In this case, the organic alkoxysilane is preferably formed by replacing the functional group in the silane with an organic radical selected from the group consisting of mrthyl, ethyl, and propyl.

Meanwhile, the functional additive preferably comprises at least one of FAS (fluoroalkoxysilane) or PDMS (polydimethylsiloxane) for securing non-tackiness.

Examples of the coloring pigments that can be used in the present invention include titanium oxide (TiO2 / Rutile), zinc oxide, silver white, red pigments such as Bengala, Vermilion, cadmium red, iron oxide (Fe2O3, Fe3O4) Yellow, cadmium yellow, titanium yellow, prussian blue, cobalt blue as a blue pigment, carbon black as a black pigment, and iron black. One or more of these may be used in combination.

Next, a ceramic coating method of a plastic kitchen container according to an embodiment of the present invention will be described. The ceramic coating method of a plastic kitchen container according to an embodiment of the present invention is a ceramic coating method of a plastic kitchen container using the ceramic coating composition of the plastic kitchen container as shown in FIG. 3, (S3) of cleaning the plastic surface, a step (S4) of pre-heating the surface of the plastic container, and a step (S4) of removing the plastic (S5) of applying the undercoating agent to the surface of the container; and applying the topcoating agent on the undercoating film coated with the undercoating agent. A step (S6) of applying the coating composition in a wet-on-wet manner, and a step (S7) of performing heat treatment while drying the top coating film coated with the top coating agent.

In this case, the step (S2) of roughing the plastic surface is a step of imparting surface irregularities to the material in order to increase the adhesion force between the paint and the substrate. Sandblasting is commonly used, But is not limited thereto.

The step S3 of cleaning the plastic surface is a step of removing the sanding yarn remaining on the surface of the substrate after the sandblast, and in order to prevent the adhesion force of the sanding residue to the surface of the workpiece, will be. Dry cleaning with brushes and compressed air, and wet cleaning with acid and alkali, and it is preferable to select an appropriate cleaning method depending on the type of substrate. Meanwhile, it is possible to further perform the ultrasonic cleaning in which the ultrasonic vibration is applied after being immersed in the cleaning solution, if necessary.

Preheating the surface of the plastic container (S4) is a step of preheating the substrate before coating. The preheating is preferably to maintain the surface temperature of the substrate at about 60 to 65 DEG C, , The texture of the coating film can be improved. If the preheating temperature is high, rough surface, gloss unevenness, and contact failure may occur. If the preheating temperature is low, problems such as poor gloss, flow, and low film thickness may occur.

On the other hand, the undercoating agent and the topcoating agent are separately provided as separate components so as to prevent the change of characteristics due to the reaction of each component during storage and to perform an efficient coating process, so that the silica sol is sufficiently dispersed Mixing the dispersed silica sol and the other components with each other, mixing and aging the mixed mixture for a predetermined time, and filtering the mixed solution, It is preferable to perform the step of applying (S5) and the step (S6) of applying the top coat agent.

In the foregoing, optimal embodiments have been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims

10 to 70 parts by weight of silica sol, 5 to 60 parts by weight of silane, 5 to 25 parts by weight of water, 5 to 20 parts by weight of a ceramic additive, 5 to 25 parts by weight of a pigment and 5 to 30 parts by weight of a solvent;
10 to 70 parts by weight of silica sol, 5 to 60 parts by weight of silane, 5 to 30 parts by weight of water, 1 to 10 parts by weight of a functional additive and 5 to 40 parts by weight of a solvent; Wherein the ceramic coating composition of claim 1 is a ceramic coating composition for a plastic kitchen container.

The method according to claim 1,
Wherein the silane comprises 2 to 50 parts by weight of an organoalkoxysilane in 100 parts by weight of the silane,
Wherein the organic alkoxysilane is formed by replacing functional groups in the silane with organic radicals selected from the group consisting of mrthyl, ethyl, and propyl.

The method according to claim 2,
Wherein the functional additive comprises at least one of FAS (fluoroalkoxysilane) or PDMS (polydimethylsiloxane) for securing non-tackiness.

A ceramic coating method of a plastic kitchen container using the ceramic coating composition of the plastic kitchen container according to any one of claims 1 to 3,
(S1) of removing contaminants and foreign matter on the surface of the plastic container;
Roughening said plastic surface (S2);
Washing said plastic surface (S3);
Preheating the plastic container surface (S4);
(S5) applying the undercoating agent to the surface of the plastic container;
The upper coating agent is applied on the lower coating film coated with the lower coating agent. Applying S6 in a wet-on-wet manner;
A step (S7) of performing heat treatment while drying the top coating film applied with the top coating agent;
The method of claim 1,

The method according to claim 4,
The undercoating agent and the topcoating agent are separately provided as respective components,
A pre-mixing rolling step in which the silica sol is sufficiently dispersed;
A mixing step of mixing the dispersed silica sol and other components with each other;
Rolling the mixed mixture for a predetermined time, aging and filtering; (S5) of applying the undercoating agent, and (S6) applying the topcoating agent to the ceramic container.