KR20130130568A - Spray-type sandable resin composition and method thereof - Google Patents

Abstract

The present invention relates to a spray type sandable epoxy resin composition comprising an epoxy resin with the epoxy equivalent weight of 100 to 300, an inorganic material, thixotropic agent, a solvent and a dispersing agent. The present invention provides the sandable epoxy resin composition which exhibits excellent adhesive force on various molded products such as aluminum, poly vinyl chloride, acryl butylene styrene, acryl etc, has proper viscosity in order to being sprayed for a spray, does not flow down a vertical plane in a spray coating operation since the physical properties of the resin is improved while maintaining the existing physical properties and shows excellent sand properties after being cured, and a manufacturing method thereof. Additionally, the present invention provides a spray type sandable resin composition which has excellent texture and adhesive force, is suitable for delamination phenomenon and pin hole phenomenon, and reduces the bad smelling odor of the styrene monomers.

Description

Spray sandable epoxy resin composition and its manufacturing method {SPRAY-TYPE SANDABLE RESIN COMPOSITION AND METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sandable epoxy resin composition for spraying and a manufacturing method thereof, and more particularly, to aluminum, poly vinyl chloride, acryl butadien styrene, acryl The present invention relates to a sandable epoxy resin that is excellent in adhesion to various moldings and has a resin property that is enhanced while retaining existing properties of the resin and that can be spray-sprayed without flowing down during work on a vertical surface.

The present invention relates to a coating article containing an epoxy group-containing polyester-modified polymer and a compound having a blocked carboxyl group, and excellent in coating performance and finish appearance using a thermosetting composition and a coating material having excellent pinhole removal and surface sanding properties. This thermosetting composition is excellent in storage stability, has excellent hardness, chemical resistance, stain resistance, and workability and impact resistance derived from a polyester resin, and also has excellent sanding properties. It is characterized by having. The present invention can be suitably used in, for example, paints, adhesives, molded articles, and the like.

Conventionally, a compound having a carboxyl group and a reactive functional group capable of forming a chemical bond with the carboxyl group by heating, such as an epoxy group, an oxazoline group, a silanol group, an alkoxysilane group, an amino group, an imino group, an isocyanate group, a blocked isocyanate Thermosetting compositions consisting of a compound having a group, a cyclocarbonate group, a vinyl ether group, a vinylthioether group, an aminomethylol group, an alkylated aminomethylol group, an acetal group, a ketal group and the like have been known. Color thixotropic product developed for top coating of marble and other plastic molding foams. It is used for cosmetics of moldings to reinvent the merchandise and increase purchasing power, or to protect moldings to protect the functions and durability of products. .

In the thermosetting composition used in the field of coatings, as a main polymer, polymers or polyester resins of vinyl monomers such as (meth) acrylic acid ester polymers and styrene polymers have mainstream. to be.

Spray sanding (Sprayable Fairing) resin is an epoxy resin excellent in water resistance, weather resistance, mechanical properties and chemical properties, and is widely used in the field of aluminum ships, bathtubs, water tanks, electrical materials, building materials. The compositions are used for the pinhole removal of molded articles as their properties and applications, but there are problems that must be improved in common.

Conventional sanding resins have a long working time due to high curing time and viscosity, and show a number of problems such as poor workability during complex molding or, in particular, molding of large products, which are rapidly increasing in demand these days.

In addition, conventional sanding resins were difficult to spray the viscosity / flow of the resin during coating. The coating should be thin and as uniform as possible, but there is a disadvantage that uniform operation is not easy due to coating thickness control and flowability.

In addition, since the gas odor of the styrene monomer used as a diluent is gradually generated over a long time, it is a problem in the art to prevent or reduce the generation of malodorous styrene monomer gas.

In addition, the main layer of the polyester resin is the sandpaper and adhesive lacks the work is difficult and takes a long time.

If the undercoat work is done immediately after the putty work to paint the aluminum molding, it is impossible to produce a good side molded product due to the pinhole problem caused by the putty hardening, and due to the characteristics of vinyl ester resin, a large amount of bubbles are generated when mixing the accelerator and the curing agent. In the case of spray coating, there are many pinholes, and the defect rate is too high for commercialization.

In addition, there is a method of mixing and using a monomer having excellent adhesion, for example, methacrylate, methyl methacrylate in order to improve the drawbacks, but there are a lot of restrictions to practical use, such as workability, price, environmental problems, etc. Followed.

The present invention has been made to solve the above problems, and excellent adhesion to various moldings, such as aluminum (Aluminum), polyvinyl chloride (PolyVinylChloride), acrylic butadien styrene (Acryl Butadien Styrene), acrylic (Acryl) It is an object of the present invention to provide a sandable resin composition having an appropriate viscosity that can be sprayed for spraying.

Another object of the present invention is to provide a resin composition having excellent properties of sag resistance, coating film formation, and excellent sanding properties while maintaining the existing physical properties of the resin as it is, and the physical properties of the resin are enhanced and do not flow down during the spray spray coating operation on the vertical surface. It is.

Still another object of the present invention is to provide a resin composition for spraying, which is capable of obtaining a qualitatively improved molded article having an excellent texture, excellent adhesion and pinhole removal when coated on a molded article.

Still another object of the present invention is to provide a spray resin composition capable of reducing odor of styrene monomer contained in a polyester resin molded article or resin.

Still another object of the present invention is to provide a method for producing a spraying resin composition.

The present invention is to achieve the above object, the subject is to include an epoxy resin of 100 to 300 epoxy equivalent, inorganic, thixotropic agent, solvent and dispersant; And a curing agent, an inorganic resin, a thixotropic agent, a solvent, a dispersant, and an epoxy resin composition for spraying.

Specifically, the epoxy resin composition is a subject comprising 40 to 60% by weight epoxy resin, 25 to 45% by weight inorganic, 0.1 to 0.5% by weight thixotropic agent, 10 to 20% by weight solvent and 2 to 5% by weight dispersant; And a curing agent including 30 to 50 wt% of a room temperature curing agent, 40 to 60 wt% of an inorganic substance, 0.1 to 0.5 wt% of a thixotropic agent, 10 to 20 wt% of a solvent, and 2 to 5 wt% of a dispersant.

In addition, the mixing ratio of the main agent and the curing agent is characterized in that 1: 1 to 1.5 as mass ratio.

In addition, the thixotropic agent is characterized in that the silica powder or organic clay.

In addition, the epoxy resin is characterized by using a bisphenol A type, bisphenol F type, phenol noblock type, cresol noblock type, modified noblock type, modified noblock epoxy type.

In addition, the room temperature curing agent is characterized by using aliphatic polyamines.

In another aspect, the present invention comprises the steps of mixing 50 to 70% by weight epoxy resin having an epoxy equivalent of 100 to 300, 30 to 50% by weight inorganic and 0.1 to 0.5% by weight thixotropic agent; Dispersing the mixed solution using a roller; And adding 10 to 20% by weight of the solvent and 2 to 5% by weight of the dispersant to the dispersed solution to prepare a main body,

Mixing 30 to 50 wt% of room temperature curing agent and 50 to 70 wt% of inorganic material; Dispersing the mixed solution using a roller; And it provides a method for producing a spray epoxy resin composition comprising preparing a curing agent by mixing by adding 10 to 20% by weight and 2 to 5% by weight of the dispersant to the dispersed solution.

According to the present invention, it has excellent adhesion to various moldings such as aluminum, polyvinyl chloride, acryl butadien styrene, acryl, and the like, and has an appropriate viscosity to be sprayed for spraying. It is possible to provide a sandable resin composition having the same and a method for producing the same.

In addition, it is possible to provide a resin composition and a method for producing the same, which have excellent properties such as excellent properties of sag resistance, coating film formation, and excellent sanding properties, without reflowing during spray spray coating operation, while maintaining the existing properties of the resin as it is. Can be.

In addition, it is possible to provide a resin composition for spraying and a method for manufacturing the same, which are capable of obtaining a qualitatively improved molded article having excellent texture, excellent adhesion and pinhole removal when coated on a molded article.

Moreover, the resin composition for spraying which can reduce the odor of a styrene monomer odor contained in a polyester resin molded object or resin, and its manufacturing method can be provided.

The present invention relates to an epoxy resin composition capable of sanding for spraying comprising an epoxy resin having an epoxy equivalent of 100 to 300, an inorganic substance, a thixotropic agent, a solvent, and a dispersant.

The present invention can not produce a good cotton molded article due to the problem of pinholes caused by curing putty if the undercoat and the intermediate work is done immediately after the putty work to coat the aluminum molding, and also due to the characteristics of the vinyl ester resin, when the accelerator and the curing agent are mixed Sand double that improves adhesiveness and has excellent physical properties and various functions to obtain a resin composition that compensates and improves problems of coating resins for moldings such as a large amount of bubbles and pin holes during spray coating Provide resin.

For this purpose, the composition according to the present invention comprises a subject comprising 40 to 60% by weight epoxy resin, 25 to 45% by weight inorganic, 0.1 to 0.5% by weight thixotropic agent, 10 to 20% by weight solvent and 2 to 5% by weight dispersant; And a curing agent including 30 to 50 wt% of a room temperature curing agent, 40 to 60 wt% of an inorganic substance, 0.1 to 0.5 wt% of a thixotropic agent, 10 to 20 wt% of a solvent, and 2 to 5 wt% of a dispersant.

As the epoxy resin of the present invention, bisphenol A type, bisphenol F type, phenol noblock type, cresol noblock type, modified noblock type, and modified noblock epoxy type are used.

It is preferable that the said epoxy resin uses the equivalent resin in the range of 100-300.

In addition, it is preferable to add the content of 50 to 70% by weight of the epoxy resin in the main part, when less than 50% by weight, the toughness and rigidity is remarkably inferior. Because.

Preferably, the thixotropic agent is added in an amount of 0.1 to 0.5% by weight. When it is less than 0.1% by weight, the flowability is increased vertically, and when it exceeds 0.5% by weight, it is preferable to be a property inhibiting element by excessive prescription. Because you can not.

The inorganic content is preferably 30 to 50% by weight, because if it is out of the content range is not sanded, while if exceeded, the physical properties are lowered, which is undesirable.

The content of the solvent and dispersant is preferably 10 to 20% by weight and 2 to 5% by weight, respectively, because the content of the solvent and dispersant is undesirable because it is an inhibitory factor in terms of mixing and viscosity.

In addition, it is preferable to add a content of 30 to 50% by weight of the room temperature curing agent in the curing agent portion, if less than 30% by weight uncured portion may occur, if it exceeds 50% by weight is not preferable because the residual curing agent is generated to be.

The inorganic content is preferably 30 to 50% by weight, because it is not sanded when the content is out of the content range, whereas when the inorganic content is exceeded, the physical properties are lowered, which is not preferable.

The content of the solvent and dispersant is preferably 10 to 20% by weight and 2 to 5% by weight, respectively, because the content of the solvent and dispersant is undesirable because it is an inhibitory factor in terms of mixing and viscosity.

In addition to the above components, other additives may be added to the resin composition according to the present invention, in particular, the present invention. Among them, the flow inhibitor is a composition to be added during spray molding, and the present invention may use more than expected flow by using an organic amide in the sandable resin composition. Prevention effect can be obtained.

Another concept of the present invention relates to a method for producing a sprayable sandable resin composition, and provides a method of dispersing a component of the resin composition by a rolling process. Specifically, the following process is included.

How to make a subject,

Mixing 40 to 60% by weight of epoxy resin having an epoxy equivalent weight of 100 to 300, 25 to 45% by weight of inorganic material and 0.1 to 0.5% by weight of thixotropic agent;

Dispersing the mixed solution using a roller; And

10 to 20% by weight of the solvent and 2 to 5% by weight of the dispersant are added to the dispersed solution.

The method of manufacturing a hardener is

Mixing a room temperature curing agent 30 to 50% by weight, inorganic material 40 to 60% by weight;

Dispersing the mixed solution using a roller; And

10 to 20% by weight of the solvent and 2 to 5% by weight of the dispersant are added to the dispersed solution.

In the coating method using the sandable epoxy resin composition of the present invention, a resin composition prepared in a desired color to a molded article or a molding mold is applied by spray coating, and then cured at room temperature for about 20 to 24 hours. What is obtained from this is an excellent molded product with excellent texture and adhesion, and qualitatively improved in peeling and pinhole removal, which can bring economic benefits such as several times reduction in raw material charges.

Since the curing method is a room temperature curing, as a curing agent, aliphatic polyamines that are rich in reactivity and which can control Potlife (housework time) are used. In particular, the curing agent is often used as a form having an amino group at the terminal by adding an epoxy resin, acrylonitrile, ethylene oxide and the like. The acrylonitrile, ethylene oxide and the like have the advantage of low toxicity and volatility.

In the case of using the sandable epoxy resin obtained by the above method, the above curing agent is added and used, and in order to obtain a coating layer made of the resin composition of the present invention, after selectively removing the curing residue and dust on the entire surface of the mold, the adhesive strength between the mold and the coating layer The primer can be applied as an adhesive to strengthen the coating as thin as possible, then sufficiently dried and then coated. The workplace temperature is suitably 10 ° C. or higher, and in particular, during heat curing, the gel is preferably cured after 120 minutes at 40 to 60 ° C. after gelling.

The mixing ratio of the main agent and the curing agent for spraying the epoxy resin composition of the present invention on the molded article is blended at a mass ratio of 1: 1 to 1.5 by weight of the main agent and the curing agent. 68SS, needle # 668 and air nozzle # 68PB may be used, but is not limited thereto.

The sandable epoxy resin composition of the present invention is excellent in adhesive strength and can be used not only for aluminum molded bodies but also for thermosetting resin molded bodies and thermoplastic resin molded bodies for fillers for removing pinholes, and thus the use range is wide. In addition, it is possible to reduce the odor of styrene monomers generally contained in polyester resins, and have good anti-lifting, water resistance, weather resistance and heat resistance, and flexural strength, flexural modulus, tensile strength, compressive strength and hardness. It is environmentally friendly with excellent mechanical properties.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, since these examples are only for illustrating the present invention, the scope of the present invention should not be construed as being limited thereto.

[Example]

57% by weight of epoxy resin (Kukdo Chemical, Kumho PnB), 28% by weight of inorganic material, 0.5% by weight of thixotropic agent made of silica powder or organic clay, are dispersed evenly using a roller, and 12% by weight of solvent And 2.5% by weight of dispersant and minor other additives to prepare the subject composition. Next, 50 wt% of room temperature curing agent, 40 wt% of inorganic substance, and silica powder were dispersed evenly using a roller, and a curing agent composition was prepared by adding 8.5 wt% of solvent, 1.5 wt% of dispersant, and a small amount of other additives. .

The resin composition prepared above was spray-coated onto the mold surface using a spray gun # 95, nozzle # 68SS, needle # 668, and air nozzle # 68PB manufactured by Binks, and then cured at room temperature for 24 hours.

Work processes and results are shown in Table 1 below.

Item Example When applying vertical surface Not flowing Work Tool Spray (Binks Corporation # 95) Viscosity (25 ℃) 12000 ~ 25000 cps Coating layer hardness 75 to 80 (Teclock, type D)
(1mm thickness, after 24h coating) Full Curing Time 24h Coated Side / Thickness Elegant / uniform

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereby. something to do. Thus, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

Claims (7)

The subject includes an epoxy resin, an inorganic substance, a thixotropic agent, a solvent, and a dispersant having an epoxy equivalent weight of 100 to 300; The hardening | curing agent contains the room temperature hardening | curing agent, an inorganic substance, a thixotropic agent, a solvent, and a dispersing agent, The epoxy resin composition for spraying characterized by the above-mentioned.
The method of claim 1,
A subject comprising 40 to 60 wt% of an epoxy resin, 25 to 45 wt% of an inorganic material, 0.1 to 0.5 wt% of a thixotropic agent, 10 to 20 wt% of a solvent, and 2 to 5 wt% of a dispersant; And a curing agent comprising 30 to 50 wt% of a room temperature curing agent, 40 to 60 wt% of an inorganic substance, 0.1 to 0.5 wt% of a thixotropic agent, 10 to 20 wt% of a solvent, and 2 to 5 wt% of a dispersant. Epoxy resin composition.
The method of claim 1,
The compounding ratio of the said main material and a hardening | curing agent is the epoxy resin composition for spraying which is 1: 1 to 1.5 as mass ratio.
The method of claim 1,
The thixotropic agent is an epoxy resin composition for spraying, characterized in that the silica powder or organic clay.
The method of claim 1,
The epoxy resin is a spray epoxy resin composition characterized by using a bisphenol A type, bisphenol F type, phenol noblock type, cresol noblock type, modified noblock type, modified noblock epoxy type.
The method of claim 1,
Aliphatic polyamines are used as the room temperature curing agent, the epoxy resin composition for spraying.
Mixing 50 to 70% by weight of epoxy resin having an epoxy equivalent weight of 100 to 300, 30 to 50% by weight of inorganic material and 0.1 to 0.5% by weight of thixotropic agent; Dispersing the mixed solution using a roller; And adding 10 to 20% by weight of the solvent and 2 to 5% by weight of the dispersant to the dispersed solution to prepare a main body,
Mixing 30 to 50 wt% of room temperature curing agent and 50 to 70 wt% of inorganic material; Dispersing the mixed solution using a roller; And 10 to 20% by weight of the solvent and 2 to 5% by weight of the dispersant to the dispersed solution to prepare a curing agent from the mixing step of producing an epoxy resin composition for spraying.