KR102045711B1 - Coating composition for jig and metal structural component without primer coating and jig and metal structural component coated with the same - Google Patents

Abstract

The present invention relates to a coating composition for coating a jig unnecessary for primer coating and a metal structure material and a jig and a metal structure coated with the coating composition for coating and, more specifically, to a coating composition for coating a jig unnecessary for primer coating and a metal structure material, which comprises: a polyurethane resin in which an acrylic polyol resin or an ester-modified acrylic polyol resin, and an isocyanate resin are bonded in a network structure; a binder resin including a first binder portion bonded to a mesh structure of the polyurethane resin and a second binder portion attached to a surface of the jig; and a pigment, and to a jig and a metal structure coated with the coating composition for coating.

Description

Coating composition for jig and metal structure coating which does not require primer coating and jig and metal structure material coated with coating composition for coating

The present invention relates to a coating composition for coating a jig and a metal structural material that does not require a primer coating, and to a jig and a metal structural material coated with the coating composition for a coating. More specifically, the present invention provides a jig without a primer pretreatment process. Jig and coating composition for coating a metal structure material and a jig coated with the coating composition which do not need primer coating, which can maintain the film properties of the film in the same or more and can reduce the process and reduce the cost due to the absence of the primer pretreatment process. It relates to a metal structural material.

Products such as automobiles, home appliances, and mobile phones are produced by assembling one or more parts, and in addition to assembly, work such as altar, press, and painting is required. In order to improve the automation, accuracy, and productivity of the manufacturing process, a jig (fixture) for positioning, holding, and fixing the object to be processed is required. Generally, the jig is manufactured from metal materials such as iron, aluminum, and stainless steel. In order to protect the material from rust, corrosion, and contamination, improve the appearance with color, and to give an identification function to distinguish it from other functions such as function, meaning, and belonging of the coloring material, the coating is essential. This important role in metal coatings requires a high level of quality and technical skill, because the product is used for a long time in various climates and environmental conditions throughout the world.

This jig coating process is applied through a series of process steps, the fixing jig is a process for manufacturing non-ferrous metals such as aluminum, stainless steel or iron material, and the purpose and jig for preventing rust, corrosion, contamination The coating composition is coated for the safety of the user or the jig maker. As an example, the driving support body of the jig is ivory color, the driving support of the jig is yellow, and the driving part of the jig is coated with a color such that the worker can visually identify a risk factor.

Meanwhile, non-ferrous metals such as aluminum and iron materials are simultaneously used in the jig according to the weight, strength, pressure, and the number of times of use of the jig. There is no situation. Currently, in order to improve the adhesion between the jig and the base paint, and to obtain an adhesive force suitable for both the nonferrous metal and the ferrous material, the surface of the jig is treated with epoxy primer before the coating of the base paint, but completely required properties There is no base paint that satisfies.

In particular, as a material used for jig for factory automation, since both aluminum and iron are used at the same time, epoxy primer and epoxy top coating, that is, two-stage coating, are used as a set. It is a situation that has not been exercised. Furthermore, until now, as an effective method to secure the rust resistance of the iron material, since the epoxy primer treatment has been applied as a mandatory, a two-stage coating system is applied to the top coating is mandatory, which is a process time There arises a problem that the longer the productivity is reduced.

The object of the present invention is that even if the surface of the jig is excluded from the conventional primer coating, the base paint contains a conventional primer component, so that the appearance and corrosion resistance of the jig can be secured even after only one coating step of the base paint coating. It is to provide a jig and a coating material for coating metal structures that can be unnecessary primer coating.

Still another object of the present invention is to provide a jig and a metal structural member coated with the coating material for coating.

In order to achieve the above object, according to an aspect of the present invention, an acrylic polyol resin or an ester-modified acrylic polyol resin, and a polyurethane resin having an isocyanate resin bonded in a mesh structure; A binder resin including a first binder portion bonded to the mesh structure of the polyurethane resin and a second binder portion attached to a surface of a jig; And the coating composition for jig coating which does not require primer coating provided with a pigment is provided.

Here, the jig coating material may include 10 to 30 parts by weight of the polyurethane resin, 0.1 to 10 parts by weight of the binder resin and 15 to 35 parts by weight of the pigment.

The binder resin may be a polyester resin having a phosphate group, the first binder portion may be a polyester portion of the polyester resin, and the second binder portion may be the phosphate group included in the polyester resin.

In this case, the binder resin may be included in 0.1 to 30.0% by weight of the total content of the polyurethane resin and the binder resin.

The binder resin may be a chlorinated polypropylene resin, the first binder portion may be a polypropylene portion of the chlorinated polypropylene resin, and the second binder portion may be a maleic acid portion and a chlorine group of the chlorinated polypropylene resin.

At this time, the binder resin, may be included in the 5.0 to 50.0% by weight of the total content of the polyurethane resin and the binder resin.

The binder resin may be a non-chlorinated polypropylene resin, the first binder portion may be a polypropylene portion of the non-chlorinated polypropylene resin, and the second binder portion may be a maleic acid portion of the non-chlorinated polypropylene resin.

At this time, the binder resin, may be included in the 5.0 to 50.0% by weight of the total content of the polyurethane resin and the binder resin.

The binder resin is a modified polypropylene resin having a carboxyl group or an anhydride group introduced therein, wherein the first binder portion is a polypropylene portion of the modified polypropylene resin, and the second binder portion is the carboxyl group of the modified polypropylene resin or It may be the anhydrous acid group.

At this time, the binder resin, may be included in the 5.0 to 50.0% by weight of the total content of the polyurethane resin and the binder resin.

In addition, the modified polypropylene resin may be one having a number average molecular weight of 3,000 to 20,000.

On the other hand, according to another aspect of the present invention, there is provided a jig coated with a coating composition for jig coating unnecessary primer coating according to the present invention described above.

According to the present invention, even if the surface of the fixing jig used for automobile manufacture or the like is not applied with the primer coating, which is conventionally performed, it is necessary for the base material to be attached to the binder component included in the conventional primer coating agent and the metal material which is the surface material of the jig. Since all the binder components are included, it is possible to secure the appearance and the corrosion resistance of the jig even if only one step coating of the base paint is performed.

In addition, since the primer pretreatment step is not performed, there is an effect of shortening the process and reducing the cost.

Hereinafter, the present invention will be described in detail. The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Therefore, the configurations described herein are only one of the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and therefore, various equivalents and modifications may be substituted for them at the time of the present application. It should be understood that it can.

Coating composition for jig coating unnecessary primer coating according to an aspect of the present invention, acrylic polyol resin or ester-modified acrylic polyol resin, and isocyanate resin is a polyurethane resin bonded in a mesh structure; A binder resin including a first binder portion bonded to the mesh structure of the polyurethane resin and a second binder portion attached to a surface of a jig; And pigments.

According to the present invention, even without the primer pretreatment process, the coating film properties of the jig can be maintained at equal or more, and the absence of the primer pretreatment process can reduce the process and reduce the cost. Since the coating composition of the present invention includes both the binder component included in the conventional primer coating agent and the binder component necessary for attaching the metal material, which is the surface material of the jig, the appearance of the jig even after only one coating step of the base paint coating And corrosion resistance can be secured.

Coating composition for jig coating of the present invention, in addition to the above components, may further include other additives or solvents.

The coating composition for jig coating of the present invention may be directly coated on a jig itself made of a non-ferrous metal material such as aluminum, a stainless steel material or an iron material, and used to coat the jig. In particular, the coating composition of the present invention can increase the adhesion of the jig material to the coating composition without the primer pretreatment process for the existing jig material, and can enable a good appearance, stable and reliable coating. As a result, the coating composition for jig coating of the present invention may be directly coated on a jig material to form a primerless base coating layer without a primer coating.

In particular, the coating composition for jig coating of the present invention may not include a plasma treatment process before the primer pretreatment process in the existing coating process, but when the plasma treatment process is performed, the plasma untreated section occurs on some surfaces of the jig surface, thereby painting This can solve problems that may adversely affect the system.

The polyurethane resin of the present invention serves as a matrix for forming the primerless base coating layer when coating the coating composition on the jig, and is coated on the jig to serve as a base of the coating layer.

The polyurethane resin of the present invention is characterized in that an acrylic polyol resin or an ester-modified acrylic polyol resin and an isocyanate resin are bonded in a mesh structure. Such a polyurethane resin is evenly provided with solvent resistance, water resistance, corrosion resistance, weather resistance and mechanical properties, thereby forming a thermosetting coating film.

The polyurethane resin may be bonded to the main resin having the acrylic polyol resin or the ester-modified acrylic polyol resin as a backbone, and reacted with an isocyanate resin at an equivalent ratio of -OH group and -NCO group in a mesh structure.

And the binder resin of this invention contains the 1st binder part couple | bonded with the said network structure of the said polyurethane resin, and the 2nd binder part adhere | attached with the surface of a jig | tool.

In this case, the binder resin may include 10 to 30 parts by weight of the first binder part, and may include 0.1 to 3 parts by weight of the second binder part.

As such, when the first binder portion and the second binder portion satisfy the relative content, appropriate adhesion may be formed on the surfaces of the polyurethane resin and the jig, respectively.

The first binder portion may exhibit non-polarity, and the second binder portion may exhibit polarity. The first binder portion, which exhibits non-polarity, may be strongly bound to the polyurethane resin, and thus may be used as a base resin for adhesion, corrosion resistance, water resistance, weather resistance, and mechanical properties. It is possible to have a second binder portion having a polarity and adhere to the surface of the jig, so that even if there is no conventional primer coating, there is an effect that the base paint component and the surface of the jig is strongly attached.

In addition, the pigment according to the present invention provides a color to the jig, particularly a colored color. For example, the driving support body of the jig of the jig is ivory color, the driving support of the jig is yellow, and the driving part of the jig is coated with red color. For example, the color is classified according to the part of the jig so that workers can visually identify the risk factor. Pigments such as organic / inorganic colored pigments, aluminum-pastes, pearls, sieving pigments and the like commonly used in the jig may be included, and these may be used alone or in combination of two or more thereof.

On the other hand, the jig coating material of the present invention may be included in 10 to 30 parts by weight of the polyurethane resin, 0.1 to 10 parts by weight of the binder resin and 15 to 35 parts by weight of the pigment.

At this time, when the polyurethane resin is less than 10 parts by weight, the performance, such as durability, chemical resistance, corrosion resistance, etc., the main performance may be lowered, and when it exceeds 30 parts by weight, the adhesive force with the jig surface made of steel or aluminum is lowered Can be.

And, when the binder resin is less than 0.1 parts by weight, the adhesive force to the surface of the jig made of aluminum may be lowered, and when it exceeds 10 parts by weight, physical properties such as durability and chemical resistance may be lowered.

The pigment may adversely affect the physical properties of the coating layer when applied to the jig during excessive use, so the amount of the pigment should be controlled. In an embodiment, the pigment may be included in an amount of 15 to 35 parts by weight as described above in the coating composition for jig coating. When the above range is satisfied, material concealment and sufficient color can be realized when used in the coating composition for jig coating, and the physical properties of the coating film are not affected.

The binder resin according to an embodiment of the present invention may be a polyester resin having a phosphate group, the first binder portion may be a polyester portion of the polyester resin, and the second binder portion may be the phosphate group included in the polyester resin. In this case, the binder resin may be included in 0.1 to 30.0% by weight of the total content of the polyurethane resin and the binder resin.

Here, the method of manufacturing the resin which the said polyester resin which has the said phosphate group which is binder resin, and the polyurethane resin of this invention couple | bonded with the polyester resin which has a phosphoric acid group at the terminal to an acrylic polyol resin or ester modified acrylic polyol resin is carried out. In the total content of the polyurethane resin and the binder resin, to have a composition of 0.1 to 30.0% by weight, and then reacting the -NCO group corresponding to the -OH group equivalent in an equivalent ratio to form a thermosetting polyurethane composition bonded in a network structure. . At this time, the polyester portion, which is the first binder portion, is later combined with the mesh structure of the polyurethane, and when the second binder portion, the phosphate group, is coated on the jig later, adheres to the surface of the jig, and has adhesion, corrosion resistance, water resistance, and weather resistance. And mechanical properties.

The binder resin according to another embodiment of the present invention is a chlorinated polypropylene resin, the first binder portion is a polypropylene portion of the chlorinated polypropylene resin, and the second binder portion is a maleic acid portion and chlorine group of the chlorinated polypropylene resin. In this case, the binder resin, in the total content of the polyurethane resin and the binder resin, may be included in the 5.0 to 50.0% by weight.

Here, the method for producing a resin in which the chlorinated polypropylene resin, which is a binder resin, and the polyurethane resin of the present invention is combined, is an acrylic polyol resin or an ester-modified acrylic polyol resin, and a chlorinated polypropylene resin is used for the polyurethane resin and the Among the total content of the binder resin, to have a composition of 5.0 to 50.0% by weight, and then -NCO groups corresponding to -OH group equivalents in an equivalent ratio to form a thermosetting polyurethane composition bonded in a network structure. At this time, the chlorinated polypropylene resin can be used for all products produced in Japan Paper, Toyobo, Mitsubishi and the like. The non-polar polypropylene portion, which is the first binder portion, is later combined with the mesh structure of the polyurethane, and the maleic acid portion, which is the second binder portion, and the chlorine group, are later coated on the jig, and adhere to the surface of the jig, It has corrosion resistance, water resistance, weather resistance and mechanical properties.

In addition, when synthesizing the acrylic polyol, the chlorinated polypropylene resin may be graft-polymerized to become a chlorinated polypropylene-modified acrylic polyol, and a thermosetting paint having a network structure may be made by reacting a -NCO group corresponding to an -OH group equivalent. When synthesizing the acrylic resin, a chlorinated polypropylene modified acrylic resin obtained by graft polymerization of the chlorinated polypropylene resin is mixed with an acrylic or ester-modified acrylic polyol to form a composition, and a -NCO group corresponding to an -OH group equivalent is reacted. It is also possible to make a thermosetting paint having a mesh structure. In this case, the content of the chlorinated polypropylene modified acrylic resin may be 10 to 60% by weight in a mixture with acrylic or ester-modified acrylic polyol.

The binder resin according to another embodiment of the present invention is a non-chlorinated polypropylene resin, the first binder portion is a polypropylene portion of the non-chlorinated polypropylene resin, and the second binder portion is maleic acid of the non-chlorinated polypropylene resin. In some embodiments, the binder resin may be included in an amount of 5.0 to 50.0 wt% in the total content of the polyurethane resin and the binder resin.

Here, the method of manufacturing the resin in which the said non-chlorinated polypropylene resin which is binder resin and the polyurethane resin of this invention combined is a non-chlorinated polypropylene resin to the acrylic polyol resin or ester modified acrylic polyol resin, The said polyurethane resin And having a composition of 5.0 to 50.0% by weight of the total content of the binder resin, and reacting the -NCO group corresponding to the -OH group equivalents in an equivalent ratio to form a thermosetting polyurethane composition bonded in a network structure. At this time, the non-chlorinated polypropylene resin, all products produced by companies such as Almama can be used. The non-polar polypropylene portion, which is the first binder portion, is later bonded to the mesh structure of the polyurethane, and the maleic acid portion, which is the second binder portion, is later coated on the jig, and adheres to the surface of the jig, thereby providing adhesion, corrosion resistance, It has water resistance, weather resistance and mechanical properties.

The binder resin according to another embodiment of the present invention is a modified polypropylene resin having a carboxyl group or an anhydride group introduced therein, wherein the first binder portion is a polypropylene portion of the modified polypropylene resin, and the second binder portion is the modified polypropylene resin. It may be the carboxyl group or the anhydrous acid group of the propylene resin, wherein the binder resin, may be included in the polyurethane resin and the total content of the binder resin, 5.0 to 50.0% by weight.

Here, the method for producing a resin in which the above-described modified polypropylene resin having a carboxyl group or an anhydride group incorporated therein as a binder resin and the polyurethane resin of the present invention is combined with a polypropylene resin having a carboxyl group or an anhydrous group introduced therein and a polyurethane prepolymer. It may be prepared by the reaction, it can be reacted with 10 to 300 parts by weight of the polyurethane-based prepolymer with respect to 100 parts by weight of the polypropylene-based resin. When the content of the polypropylene-based resin is less than the above range, the adhesion to the modified polypropylene resin and the polyurethane resin, which is a nonpolar material, may be lowered. When the polypropylene-based resin is more than the above range, the stability of the coating may be lowered. In addition, when the content of the polyurethane-based prepolymer is less than the above range can be reduced the stability of the coating film, if more than the above range may be reduced adhesion to the modified polypropylene resin and the polyurethane resin of a non-polar material.

Here, the content represents the content of the composition after acid-modification by introducing a carboxyl group or an anhydride group into the polymerized polypropylene resin.

A general polypropylene resin composition has an adhesive force to a polyolefin-based material, but since it is nonpolar, it does not have an adhesive force with a polar material, so that a polarity can be imparted by introducing a carboxyl group or an anhydride group. In the present invention, the acid modification of the polypropylene resin may be a method using a homogeneous reaction and an organic solvent which is easy to remove unreacted materials.

Examples of the unsaturated compound containing a carboxyl group or an anhydride group include acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, aconitic acid, aconic anhydride, fumaric acid, crotonic acid, sheet Compounds having at least one carboxyl group or anhydrous acid group in the molecule (in the monomer unit), such as half ester of unsaturated dicarboxylic acid and half amide, such as raconic acid, mesaconic acid and allyl succinic acid, can also be used.

Especially, maleic anhydride, acrylic acid, and methacrylic acid are preferable at the point which is easy to introduce | transduce into polyolefin resin, and maleic anhydride is more preferable.

An unsaturated carboxylic acid unit can be copolymerized in polyolefin resin, The form is not limited, For example, it can be random copolymerization, block copolymerization, graft copolymerization, etc. The acid anhydride unit introduced into the polyolefin resin tends to have an acid anhydride structure in a dry state, and in an aqueous medium containing a basic compound, a part or all of the acid anhydride structure is ring-opened to have a structure of a carboxylic acid or a salt thereof.

Although the method of introducing an unsaturated carboxylic acid unit into polyolefin resin is not specifically limited, For example, the method of heat-melting and reacting polyolefin resin and unsaturated carboxylic acid above melting | fusing point of polyolefin resin in the presence of a radical initiator and making it react is carried out. The method of graft copolymerizing unsaturated carboxylic acid unit with polyolefin resin by the method of melt | dissolving a polyolefin resin in the organic solvent, heating, stirring, and reaction in presence of a radical generator is mentioned, for example.

The compound containing a carboxyl group or an anhydride group in the molecule may be used 1 to 20 parts by weight, preferably 2 to 15 parts by weight based on 100 parts by weight of polypropylene resin.

The modified polypropylene resin into which the carboxyl group or anhydrous group is used in the present invention may have a wide range of number average molecular weights. When a modified polypropylene resin having a carboxyl group or an anhydrous group introduced therein is used for producing a colorable article such as a jig, the modified polypropylene resin preferably has a number average molecular weight of about 3,000 or more, more preferably about 20,000. Or less preferably about 10,000 or less. The polypropylene (PP) resin into which a suitable anhydrous group is introduced may comprise the following structure.

In this case, the polyurethane-based prepolymer may be prepared by reacting a diisocyanate compound with a polyol or polyamine, or a reactant in which an amine or hydroxyl group is present at only one terminal at a molar ratio of 1: 0.5 to 1.

When the diisocyanate compound is more than the above range, the isocyanate does not exist only at one end, but exists at the end of the sock, which may cause a problem such as gelation of the resin. When the diisocyanate compound is less than the above range, there is no isocyanate group causing a reaction. If the polyurethane is not polymerized, the phase separation of the solution may occur due to the density difference with the polypropylene resin into which the carboxyl group or the anhydrous group is introduced.

The polyurethane-based prepolymer is a concept including all of a series of prepolymers prepared by reacting a diisocyanate compound with a polyol or polyamine, and a polyurea-based prepolymer may also be included therein. In particular, the polyurethane-based prepolymer may be prepared by reacting a diisocyanate compound with a polyol and a reaction terminator, or by reacting a diisocyanate compound with a polyamine in an appropriate ratio, and one isocyanate per molecule of the primary skeleton of the polymer compound. It may be a polymer containing a functional group.

The said polyol is a diol compound and a triol compound in the range which gelatinization does not generate | occur | produce, The normal thing as a raw material of polyurethane is used, It does not specifically limit. The polyol preferably has a number average molecular weight of 600 to 6,000, for example, polypropylene ethylene glycol, polytetramethylene ether glycol, polyester polyol, polyesteramide polyol, polyether polyol, polycarbonate polyol, polycarbonate polyol, Polyol by transesterification with polyester polyol, copolyol obtained from polyether polyol and dicarboxylic acids, and polyether ester polyol obtained by reaction of polyester or polycarbonate with epoxide or cyclic ether, and two or more hydroxyl groups The polyolefin polyol, such as polybutadiene, hydrogenated polybutadiene, polyisoprene, and hydrogenated polyisoprene, can be used. As the polyamine, a dipolyamine or a high molecular weight monopolyamine used as a chain extender can be used.

The polyurethane-based prepolymer may have a weight average molecular weight of 2,000 to 20,000 g / mol. When the molecular weight is less than the above range, the adhesion with the polar substrate may be lowered, and when the molecular weight is high, the adhesion with the non-polar material of polypropylene may be reduced.

On the other hand, the above-mentioned additives which may be further included in the coating composition for jig coating according to the present invention is added to the coating composition for jig coating in a predetermined content range to implement additional effects to increase wettability, leveling property, and the like during coating. Specific types of additives may include, for example, one or more of a humectant, an antifoaming agent, a thickener, a light stabilizer, an adhesion promoter, a surface conditioner, an antistaining agent, a softening agent.

Wetting agent is to improve the wettability and leveling properties of the coating film by adjusting the surface tension of the coating composition, it may be included in 0.5 to 3% by weight of the coating composition for jig coating according to the present invention. Within this range, the effect of improving the wettability and leveling property of the coating film may occur. Defoamer is a mixture of lipophilic and polysiloxane to increase the appearance of the coating film by breaking bubbles generated during coating, it may be included in 0.1 to 1.5% by weight of the coating composition for jig coating according to the present invention. In the above range, it is possible to suppress the generation of bubbles during coating to improve the appearance. The thickener is to control the viscosity of the coating composition and impart thixotropy to prevent the flow of the coating composition during coating, which may be included in 0.1 to 1% by weight of the coating composition. In the above range, it is possible to prevent the flow when coating the coating composition. Thickeners are mainly used in waterborne paints and compositions for waterborne paints may have a viscosity of 700 to 1,300 cPs at 25 ° C. In the above range, it may be possible to coat the material of the jig with an appropriate viscosity. The light stabilizer is a ultraviolet absorber for increasing weather resistance of the coating film, it may be included in 0.5 to 3% by weight of the coating composition. In the above range, there may be an effect of improving the weather resistance of the coating film. Adhesion promoters are mainly used to enhance the adhesion of the coating composition when used in an appropriate amount in the metallic paint, it may be included in 0.5 to 3% by weight of the coating composition. In the above range, there is an adhesion promoting effect, it is possible to prevent silver oxidation. The surface modifier is to improve the wettability and leveling properties of the coating film by adjusting the surface tension of the coating composition for jig coating according to the present invention, it may be included in 0.1 to 1.5% by weight of the coating composition. In the above range, there may be an effect of improving the wettability and leveling properties of the coating film. Anti-staining agent is to suppress the occurrence of staining when forming a coating film through the uniform arrangement of pigments, in particular silver particles during coating, 0.1 to 10% by weight, for example 0.1 to 1% by weight, or 1 to 10% by weight in the coating composition It may be included as. In the above range, there may be an effect that can suppress the generation of stains when forming a coating film. Softeners are intended to mitigate cracking in the dried coating film, and may be included in an amount of 0.5 to 5 wt% in the coating composition. Within this range, crack generation in the dry coating film is alleviated to improve impact resistance and flex resistance.

The additive may be included in 0.1 to 10% by weight of the coating composition for jig coating according to the present invention. In the above range, it is possible to enable the production of the coating composition without affecting the action of the polyurethane resin, the binder resin and the pigment according to the present invention.

The coating composition for jig coating according to the present invention may include a predetermined solvent for jig coating. The solvent facilitates the painting operation and can increase the smoothness of the coating film.

The solvent may include at least one of an aqueous solvent including distilled water and deionized water, an oily solvent such as saturated or unsaturated hydrocarbons having 1 to 20 carbon atoms, alcohols, ketones, and esters. For example, it may be included in 10 to 40% by weight of the coating composition. Within this range, the painting operation can be facilitated, and the smoothness of the coating film can be increased.

On the other hand, according to another aspect of the present invention, there is provided a jig coated with a coating composition for jig coating unnecessary primer coating according to the present invention described above.

The jig according to the present invention is one-time coating of the base paint coating because the coating composition according to the present invention contains the binder component contained in the conventional primer coating agent, even if the coating coating according to the present invention is excluded except for the primer coating conventionally performed on the surface of the jig. In spite of only the steps, the appearance and the corrosion resistance of the jig can be secured.

In addition, the manufacturing process of the jig according to the present invention can shorten the production cost.

Hereinafter, the present invention will be described in more detail with reference to specific examples. The following examples are intended to illustrate the invention, and the invention is not limited by the following examples.

Example 1 Preparation of Modified Polypropylene Resin

Example 1-1. Synthesis of Polypropylene Resin

0.4L of toluene and organoaluminum (made by Tosso Akuzo) were added to the nitrogen-substituted 3L autoclave at 25 degreeC. After the addition of hydrogen, a certain amount of propylene gas was introduced and then in the copolymerization, heterogeneous olefinic monomers were slowly added, and a predetermined catalyst / external donor-toluene solution was added to raise the temperature to a predetermined temperature and then reacted. After reacting for 3 hours, ethanol was introduced to terminate the polymerization. The obtained reactant was introduced into an ethanol-hydrochloric acid solution to precipitate a polymer, and the solvent and resin were separated, and the resulting resin was dried in a reduced pressure dryer for 7 hours to synthesize polypropylene resin.

Example 1-2. Synthesis of Polypropylene Resin Incorporated with Anhydrous Group

100 g of the copolymer resin synthesized in Example 1-1 was introduced into a 3L stainless steel reactor equipped with a thermometer and a stirring rod, and 500 g of xylene was dissolved in a mixture of 15 g of maleic anhydride and benzoyl peroxide. 10 g (10 wt%) of toluene solution was slowly added dropwise over 3 hours, and reacted again for 3 hours. Thereafter, the reaction solution was added dropwise to 2 L of acetone to crystallize, and then washed and dried three times to synthesize a modified polypropylene resin having anhydrous acid group introduced therein.

Example 1-3. Synthesis of Polyurethane-Based Prepolymer

After installing a thermometer and a stirring rod and diluting 42 g of IPDI in a mixed solvent (toluene / methylethylketone = 8/2) in a nitrogen-substituted 2L stainless reactor, Krares P-2010 (poly (3-methyl-) 200 g of 1,5-pentanediol) and molecular weight = 2000) were added and aged at 90 ° C. for 3 hours to synthesize a prepolymer. 7.4 g of butanol was added to the prepolymer to synthesize a light yellow monoisocyanate group-containing polyurethane-based prepolymer having a solid content of 20 wt%.

Example 1-4. Synthesis of Mixed Resin of Modified Polypropylene Resin and Polyurethane Resin

400 g of toluene and 100 g of a polypropylene resin having an anhydride group synthesized in Example 1-2 were introduced into a nitrogen-substituted 2L stainless reactor equipped with a thermometer and a stirring rod, and completely dissolved at 90 ° C., followed by Example 1- 250 g of the polyurethane-based prepolymer synthesized in 3 was introduced and reacted for 3 hours to synthesize a mixed resin of a modified polypropylene resin and a polyurethane resin.

Example 1-5. Preparation of paint composition for coating jig

A coating composition for jig coating was prepared by mixing 70 parts by weight of the mixed resin prepared in Example 1-4 and 30 parts by weight of a pigment having an ivory color.

The above description is merely illustrative of the present invention, and those skilled in the art to which the present invention pertains understand that the present invention may be embodied in a modified form without departing from the essential characteristics of the present invention. Could be. Therefore, the disclosed embodiments and experimental examples should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown not in the above description but in the claims, and all differences within the scope will be construed as being included in the present invention.

Claims (12)

Acrylic polyol resins or ester-modified acrylic polyol resins, and polyurethane resins in which an isocyanate resin is bonded in a network structure;
A binder resin including a first binder portion bonded to the mesh structure of the polyurethane resin and a second binder portion attached to a surface of a jig; And
With pigments,
The binder resin is a polyester resin having a phosphate group,
The said 1st binder part is a polyester part of the said polyester resin, The said 2nd binder part is a coating composition for jig coating which does not need the primer coating which is the said phosphate group which the said polyester resin has. The method of claim 1,
The coating composition for jig coating,
10 to 30 parts by weight of the polyurethane resin,
0.1 to 10 parts by weight of the binder resin and
Paint composition for jig coating unnecessary primer coating, characterized in that it comprises 15 to 35 parts by weight of the pigment. delete The method of claim 1,
The binder resin is a coating composition for jig coating unnecessary primer coating, characterized in that contained in 0.1 to 30.0% by weight of the total content of the polyurethane resin and the binder resin. The method of claim 1,
The binder resin further includes a chlorinated polypropylene resin,
The first binder portion of the chlorinated polypropylene resin is a polypropylene portion of the chlorinated polypropylene resin, and the second binder portion of the chlorinated polypropylene resin is a maleic acid portion and a chlorine group of the chlorinated polypropylene resin. Coating composition for jig coating. delete The method of claim 1,
The binder resin further comprises a non-chlorinated polypropylene resin,
The first binder portion of the non-chlorinated polypropylene resin is a polypropylene portion of the non-chlorinated polypropylene resin, and the second binder portion of the non-chlorinated polypropylene resin is a maleic acid portion of the non-chlorinated polypropylene resin. This unnecessary jig coating composition. delete The method of claim 1,
The binder resin further includes a modified polypropylene resin having a carboxyl group or an anhydride group introduced therein,
The first binder portion of the modified polypropylene resin is a polypropylene portion of the modified polypropylene resin, and the second binder portion of the modified polypropylene resin is the carboxyl group or the anhydride group of the modified polypropylene resin. This unnecessary jig coating composition. delete The method of claim 9,
The modified polypropylene resin has a number average molecular weight of 3,000 to 20,000, the coating composition for jig coating unnecessary primer coating. A jig coated with a coating composition for jig coating, which does not require primer coating according to any one of claims 1, 2, 4, 5, 7, 7, 9 and 11.