KR101902881B1 - Two-component polyurethane gelcoat paint and method for forming a polyurethane gelcoat layer using the same - Google Patents

Abstract

The two-part polyurethane gel coat paint includes a polyurethane prepolymer main part and a hardener part. The polyurethane prepolymer main component is a reactive high molecular weight polyethylene; Polyol or polyamine; A urethane reaction of a diisocyanate, and the curing agent portion is formed by reacting a polyol; At least one crosslinking and chain extender selected from diols, triols, tetraols, diamines and amino amines; A catalyst and an organic solvent.

Description

TECHNICAL FIELD [0001] The present invention relates to a two-component polyurethane gel coat paint and a polyurethane gel coat layer forming method using the two-component polyurethane gel coat paint,

TECHNICAL FIELD The present invention relates to a two-component polyurethane gel coat paint and a method for forming a polyurethane gel coat using the same. The high molecular weight polyethylene having reactivity with isocyanate is added during the production of polyurethane, A polyurethane gel coat paint and a polyurethane gel coat film forming method using the same.

Gelcoat is a paint developed for the application of FRP (Fiber Reinforced plastic) and Marble (Marble) products which are uniformly mixed and dispersed with pigments and additives in resin and colored in arbitrary colors. The purpose of using gelcoat for FRP and Marble products is to protect the surface of molding products and to maintain the beauty of the product by molding, which not only enhances the value of the products but also improves the life performance and durability of the products. This is because color matching can be done according to the consumer's preference. Applications include various applications such as automobiles, wind turbine blades, railway components and yachts, and they are continuously expanding and growing.

 Gelcoat technology is the core coating material to protect the composite materials that are exposed to long term exposure to severe degradation environment such as sunlight, seawater, water and chemical erosion to ensure durability and reliability of products. Examples of gelcoat materials include unsaturated polyester resins such as an ortho type, an iso type, and a vinyl ester type, and epoxy resins and polyurethane resins are used.

 Unsaturated polyesters and epoxy-based gelcoats in extreme environments are frequently degraded due to cracking caused by external impacts due to curing shrinkage and increased brittleness due to surface hardening, resulting in a polyurethane resin that is excellent in cold resistance and impact resistance Development is actively being carried out.

 Especially in the field of marine leisure vessels, the life time of ships is usually 20 to 25 years. Gelcoats used to protect boats are often inferior in abrasion resistance and therefore not even in ship life. Therefore, the abrasion resistance performance of the gel coat for protecting the towel is particularly important. In order to increase the abrasion resistance, there is an increasing demand to apply a polyurethane gel coat exhibiting high abrasion resistance as compared with unsaturated polyester and epoxy series gel coats. Maintenance costs for maintenance will be reduced.

It is necessary to develop materials for polyurethane gelcoats which have excellent abrasion resistance as surface finishing materials for all composite materials as well as marine leisure vessels.

In view of the above problems, it is an object of the present invention to provide a high wear-resistant two-component polyurethane gel coat paint which exhibits superior wear resistance performance than existing gel coat products such as unsaturated polyester and epoxy series.

Another object of the present invention is to provide a method for producing a highly wear-resistant two-pack type polyurethane gel coat paint and a polyurethane gel coat film forming method exhibiting excellent wear resistance performance and excellent storage performance than existing gel coat products .

In order to achieve the above object, the two-pack type polyurethane gel coat paint according to the present invention comprises a polyurethane prepolymer main portion and a curing agent portion. The polyurethane prepolymer main component is a reactive high molecular weight polyethylene; Polyol or polyamine; A urethane reaction of a diisocyanate, and the curing agent portion is formed by reacting a polyol; At least one crosslinking and chain extender selected from diols, triols, tetraols, diamines and amino amines; A catalyst and an organic solvent.

In one embodiment, the polyurethane prepolymer subject portion comprises 6 to 25% by weight of the reactive high molecular weight polyethylene; 4 to 22% by weight of polyol or polyamine; And 60 to 86% by weight of a diisocyanate.

In one embodiment, the curing agent may be formed by mixing 55 to 75 wt% of a polyol, 0.5 to 5 wt% of a crosslinking and chain extender, 0.5 to 2 wt% of a catalyst, and an excess of an organic solvent.

In one embodiment, the reactive high molecular weight polyethylene preferably has a number average molecular weight of 3,000,000 to 5,000,000 g / mol, an average particle size of 10 to 300 um, and an -OH functional group on the particle surface.

In one embodiment, the two-pack type polyurethane gelcoat coating may further comprise 3 to 15 wt% pigment.

In order to achieve the above object, the two-component polyurethane gelcoat paint according to the present invention comprises a reactive high molecular weight polyethylene; Polyol or polyamine; Providing a polyurethane prepolymer main part by urethane reaction of diisocyanate; And polyols; At least one crosslinking and chain extender selected from diols, triols, tetraols, diamines and amino amines; Mixing a catalyst and an organic solvent to prepare a curing agent part, and mixing the curing agent part with the polyurethane prepolymer main part.

In one embodiment, the polyurethane prepolymer subject portion comprises 6 to 25% by weight of the reactive high molecular weight polyethylene; 4 to 22% by weight of polyol or polyamine; Wherein the curing agent portion is formed by mixing 55 to 75% by weight of a polyol, 0.5 to 5% by weight of a crosslinking and chain extender, 0.5 to 2% by weight of a catalyst, and an excess of an organic solvent can do.

In order to achieve the above object, the polyurethane gel coat film according to the present invention comprises a reactive high molecular weight polyethylene; Polyol or polyamine; A polyurethane prepolymer main component and a polyol formed by urethane reaction of a diisocyanate; At least one crosslinking and chain extender selected from diols, triols, tetraols, diamines and amino amines; Mixing a catalyst and an organic solvent to prepare a two-component polyurethane gel coat paint containing a curing agent part; mixing the polyurethane prepolymer main part and the curing agent part of the two-component polyurethane gel coat paint to coat the surface of the object And curing the gelcoat paint coated on the surface of the object.

 The two-component polyurethane gelcoat paint having the above-described structure is produced by applying a reactive high molecular weight polyethylene (3,000,000 to 5,000,000) at the time of production, and thus, the polarity of -OH, -COOH The surface energy is maximized by the addition of functional groups. As a result, it is easily dispersed and mixed in polar materials such as polyol and prepolymer, and is chemically bonded to the polyurethane resin during the polyurethane reaction to firmly adhere to the polyurethane resin. Accordingly, the coating film formed of the polyurethane gel coat paint has improved physical properties such as improved wear resistance and low friction coefficient.

Hereinafter, a two-component polyurethane gel coat paint, a method for producing the same, and a method for forming a two-component polyurethane gel coat film according to an embodiment of the present invention will be described in detail.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Two-component polyurethane gel coat paint

A two-pack type polyurethane gel coat paint according to an embodiment of the present invention includes a polyurethane prepolymer main portion and a curing agent portion.

The polyurethane prepolymer main component is a reactive high molecular weight polyethylene; Polyol or polyamine; Is formed by urethane reaction of diisocyanate. Specifically, the main portion of the polyurethane prepolymer may be formed by urethane reaction of 6 to 25% by weight of the reactive high molecular weight polyethylene, 4 to 22% by weight of polyol or polyamine, and 60 to 86% by weight of diisocyanate.

The reactive high molecular weight polyethylene to be used in the production of the polyurethane prepolymer main part has a number average molecular weight of 3,000,000 to 5,000,000 (g / mol), an average particle size of 10 mu m to 300 mu m, . When the content of the reactive high molecular weight polyethylene applied to the main portion is less than 6% by weight of the total weight of the main portion, the level of improvement of the abrasion resistance is insufficient. When the content exceeds 25% by weight, excessive polyethylene causes phase separation in the main resin . Therefore, the reactive high molecular weight polyethylene is used in an amount of 6 to 25% by weight, preferably 7.5 to 18% by weight.

Examples of suitable polyols for use in the production of the polyurethane prepolymer main part include polyester polyols, polyether polyols, polycarbonate polyols, polycaprolactone polyols, polyacrylate polyols and the like. They may be used singly or in combination of two or more. At this time, it is preferable to use a polyol having an average functional group number of 2 to 6. The polyols and polyamines preferably have a number average molecular weight of 1000 to 8000 g / mol and a number average molecular weight of 1000 to 3000 g / mol.

If the amount of the polyol or polyamine applied to the subject part is less than 4% by weight of the total amount of the subject part, the content of the soft segment in the polyurethane gel coat system is lowered so that the polyurethane gel coat film is brittle and easily breakable, The content of the soft segment in the polyurethane gel coat system becomes too large and wear resistance may be lowered. Therefore, the polyol or polyamine is used in an amount of 4 to 22% by weight, preferably 5 to 18% by weight.

Suitable diisocyanates suitable for the preparation of the polyurethane prepolymer subject matter include 4,4'-dicyclohexylmethane diisocyanate (HMDI), 1,6-hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI) m-xylene diisocyanate (m-XDI), hexamethylene diisocyanate trimer, and the like. They may be used singly or in combination of two or more.

If the amount of the diisocyanate to be applied to the subject portion is less than 60% by weight of the total amount of the main part, the polyurethane gel coat film softens and the physical properties thereof deteriorate. If the content exceeds 86% by weight, the polyurethane gel coat film may brittle and break easily. Accordingly, the diisocyanate is used in an amount of 60 to 86% by weight, preferably 62 to 81% by weight.

The curing agent part applied to the two-pack type polyurethane gel coat paint according to one embodiment of the present invention comprises an acrylic polyol and at least one crosslinking and chain extender selected from diols, triols, tetraols, diamines and amino amines, And a solvent.

Specifically, the curing agent portion may be formed by mixing 55 to 75 wt% of a polyol, 0.5 to 5 wt% of a crosslinking and chain extender, 0.5 to 2 wt% of a catalyst, and an excess of an organic solvent.

The curing agent part uses an acrylic polyol as a polyol, and the acrylic polyol is a methacrylate ester. In addition to the methyl ester, acrylic ester includes acrylic ester such as ethyl ester n-propyl, isopropyl, butyl ester, and 2-hydroxyethyl Methacrylate, 2-hydroxyethyl acrylate, and the like. The polyol to be used for the curing agent portion of the two-pack type polyurethane gel coat paint is preferably an acrylic polyol, and the acrylic polyol having a hydroxyl value in the range of 20 to 55 may be used. Specifically, the curing agent may be prepared by mixing an acrylic polyol and a catalyst in an organic solvent so that the hydroxyl value of the organic solvent may be in the range of 20 to 55. [

The content of the polyol applied to the curing agent portion is less than the content of the softener segment in the 55 wt% polyurethane gel coat coating composition of the total amount of the curing agent portion, so that the elongation and cold resistance, which are intrinsic properties of the polyurethane, The soft segment content in the polyurethane gel coat film is increased and the tensile strength, hardness and abrasion resistance of the polyurethane gel coat film are deteriorated. Therefore, the polyol is used in an amount of 55 to 75% by weight, preferably 57 to 72% by weight.

Diol, triol, tetraol, diamine, aminoamine and the like can be used as the crosslinking and chain extender to be applied to the curing agent part of the two-pack type polyurethane gel coat paint. These may be used singly or in a mixture of two or more. Examples of the diols in the crosslinking and chain extender include ethylene glycol, propylene glycol and 1,4-butanediol. Examples of triols include glycerine, trimethyl Trimethylol propane and the like. Examples of the tetraol include pentaerythritol, oxypropylated ethylene diamine and the like. Examples of the diamine include hexamethylene diamine, m-phenyl M-phenylenediamine and the like. Examples of the aminoalcohol include diethanolamine (DEOA), triethanolamine (TEOA) and the like.

If the content of the crosslinking agent and the chain extender applied to the curing agent is less than 0.5 wt% of the total amount of the curing agent, there is little effect of improving the physical properties by introducing the crosslinking agent and the chain extender. If the amount exceeds 5 wt% The polyurethane gel coat film is brittle and can easily break even in a small impact. Therefore, the crosslinking and chain extender is used in an amount of 0.5 to 5% by weight, preferably 0.5 to 4% by weight.

As an example, the catalyst applied to the curing agent may be used to accelerate the polyurethane curing reaction, and an amine catalyst, a metal catalyst, or the like may be used as a suitable catalyst. The catalyst may be used in an amount of 0.1 to 2 wt% 0.2 to 1.5% by weight is used.

In addition, the organic solvent used for the curing agent is used for viscosity control for convenience in the subsequent coating process. Examples of the organic solvent include toluene, xylene, methyl ethyl ketone, N-methyl-2-pyrrolidone, dimethylformamide, dimethylsulfoxide and dibasic ester. These solvents may be used alone or in combination.

As an embodiment of the present invention, a pigment may further be used as an additive. Examples of the additive pigments include mineral materials such as kaolin and talc, barium sulfate, calcium carbonate, and inorganic or organic pigments used in the manufacture of paints. These may be used singly or in a mixture of two or more. As an example, the pigment may be used in an amount of 3 to 15% by weight, preferably 8 to 14% by weight, based on the total compounding ratio.

Particularly, in the preparation of the two-pack type polyurethane gel coat paint, it is preferable that the polyurethane prepolymer main part and the curing agent part are mixed so as to satisfy the value of 95 to 120 in consideration of NCO / OH INDEX.

Two-component polyurethane gel coat paint and polyurethane gel coat film formation method

In order to prepare a two-pack type polyurethane gel coat paint according to an embodiment of the present invention, a reactive high molecular weight polyethylene; Polyol or polyamine; A diisocyanate is urethane-reacted to prepare a polyurethane prepolymer main part.

As an example, the polyurethane prepolymer subject portion may comprise 6 to 25% by weight of the reactive high molecular weight polyethylene; 4 to 22% by weight of polyol or polyamine; And 60 to 86% by weight of a diisocyanate. The urethane reaction can proceed for about 2 to 5 hours.

The detailed description of the reactive high molecular weight polyethylene, polyol and diisocyanate necessary for synthesizing the polyurethane prepolymer main part has been described above in detail and is omitted in order to avoid duplication.

An acrylpolyol and a catalyst are mixed with an organic solvent to prepare a curing agent part (B) having a hydroxyl value of 20 to 55. The detailed description of the curing agent portion has been described in detail above and is omitted in order to avoid duplication.

Thereafter, the polyurethane prepolymer main portion and the curing agent portion are mixed so that the NCO / OH INDEX value satisfies 95 to 115, thereby preparing a two-component polyurethane gelcoat paint.

In order to form a polyurethane gel coat film according to another embodiment of the present invention, first, a reactive high molecular weight polyethylene; Polyol or polyamine; A polyurethane prepolymer main component and a polyol formed by urethane reaction of a diisocyanate; At least one crosslinking and chain extender selected from diols, triols, tetraols, diamines and amino amines; A catalyst and an organic solvent are mixed to prepare a two-component polyurethane gel coat paint containing a curing agent part. The detailed description of the main part of the two-part polyurethane gelcoat paint, the hardener part and the respective components for forming the same is described above in detail and is omitted in order to avoid duplication.

Subsequently, the polyurethane prepolymer main part and the hardener part of the two-part polyurethane gel coat paint are mixed and coated on the surface of the object. As an example, the coating of the coating material on the object can be carried out by using an airless sprayer, a roller, or a two-part coating equipment.

Thereafter, the polyurethane gel coat film having excellent abrasion resistance can be formed by curing the gel coat paint coated on the surface of the object.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments and comparative examples of the present invention. However, the following examples are merely examples for helping understanding of the present invention, and thus the scope of the present invention should not be limited or limited.

≪ Example 1 > (IPDI type polyurethane gel coat)

15.4 wt% of polyether polyol PP-1000 (KPX chemical hydroxyl value: 108 to 116), 69.6 wt% of isophorone diisocyanate (Vencorex, NCO content 37.5 to 37.8% by weight), high molecular weight polyethylene of INHANCE , UH-1500, and 45um) was subjected to a urethane reaction to prepare 25% of an IPDI-type polyurethane prepolymer (subject part).

Further, 64.3 parts by weight of acrylic polyol (hydroxyl group of hydroxy polymer: 34.3, NV% 66.6%), 33.9% by weight of Mixed Xylene (SK General Chemicals), 1% by weight of ethylene glycol (Honam Petrochemical) and 0.8% by weight of other catalyst To prepare a mixture (curing agent part). Topical part: The hardener part was adjusted to a weight ratio (1: 7.7) and NCO / OH INDEX 108 and uniformly mixed to prepare a polyurethane gel coat having a width of 100 mm.

Example 2 (H ₁₂ MDI type polyurethane gel coat)

, NCO content 31.8~ 32.0% by weight) 80중량%, 반응성의 고분자량 폴리에틸렌(INHANCE, UH-1500, 45um)을 15중량%을 적용하여 우레탄 반응시켜 H₁₂MDI 타입 폴리우레탄 프리폴리머(주제부) NCO: 25%를 제조 하였다. 추가로 경화제부로서 아크릴폴리올(수산고분자 수산기가: 34.3, NV% 66.6%) 64.3중량%와 Mixed Xylene(SK 종합화학) 33.9중량% 에틸렌 글리콜(호남석유화학) 1중량%, 기타 촉매 0.8중량%를 적용 혼합하여 혼합물(경화제부)를 제조 하였다. 주제부:경화제부를 무게비 (1 : 7.7), NCO/OH INDEX 108로 조절하고 균일하게 혼합하여 가로,세로 100mm 두께 10mm의 폴리우레탄 겔코트를 제조하였다. 5.0% by weight of polyether polyol PP-1000 (KPX chemical hydroxyl value: 108 to 116), 4,4'-dicyclohexylmethane diisocyanate (EVONIK

, NCO content 31.8 to 32.0% by weight) and 15 wt% of reactive high molecular weight polyethylene (INHANCE, UH-1500, 45um) were subjected to urethane reaction to obtain H ₁₂ MDI type polyurethane prepolymer : 25%. Further, 64.3% by weight of an acrylic polyol (hydroxyl group-containing hydroxyl group: 34.3, NV% 66.6%), 33.9% by weight of Mixed Xylene (SK General Chemicals), 1% by weight of ethylene glycol (Honam Petrochemical) Were mixed to prepare a mixture (curing agent part). Topical part: The hardener part was adjusted to a weight ratio (1: 7.7) and NCO / OH INDEX 108 and uniformly mixed to prepare a polyurethane gel coat having a width of 100 mm and a thickness of 10 mm.

Example 3 (IPDI type polyurethane gel coat)

21.5% by weight of polyether polyol PP-1000 (KPX chemical hydroxyl value: 108 to 116), 71.0% by weight of isophorone diisocyanate (Vencorex, NCO content 37.5 to 37.8% by weight), high molecular weight polyethylene of INHANCE , UH-1500, and 45um) was subjected to a urethane reaction to prepare 25% of an IPDI-type polyurethane prepolymer (subject part). Further, 64.3% by weight of an acrylic polyol (hydroxyl group-containing hydroxyl group: 34.3, NV% 66.6%), 33.9% by weight of Mixed Xylene (SK General Chemicals), 1% by weight of ethylene glycol (Honam Petrochemical) Were mixed to prepare a mixture (curing agent part). Topical part: The hardener part was adjusted to a weight ratio (1: 7.7) and NCO / OH INDEX 108 and uniformly mixed to prepare a polyurethane gel coat having a width of 100 mm.

Example 4 (H ₁₂ MDI type polyurethane gel coat)

, NCO content 31.8~ 32.0% by weight) 81.6중량%, 반응성의 고분자량 폴리에틸렌(INHANCE, UH-1500, 45um)을 7.5중량%을 적용하여 우레탄 반응시켜 H₁₂MDI 타입 폴리우레탄 프리폴리머(주제부) NCO: 25%를 제조 하였다. 추가로 경화제부로서 아크릴폴리올(수산고분자 수산기가: 34.3, NV% 66.6%) 64.3중량%와 Mixed Xylene(SK 종합화학) 33.9중량% 에틸렌 글리콜(호남석유화학) 1중량%, 기타 촉매 0.8중량%를 적용 혼합하여 혼합물(경화제부)를 제조 하였다. 주제부:경화제부를 무게비 (1 : 7.7), NCO/OH INDEX 108로 조절하고 균일하게 혼합하여 가로,세로 100mm의 폴리우레탄 겔코트를 제조하였다. 10.9% by weight of polyether polyol PP-1000 (KPX chemical hydroxyl value: 108 to 116), 4,4'-dicyclohexylmethane diisocyanate (EVONIK

, NCO content 31.8 ~ 32.0% by weight) and 7.5 wt% of reactive high molecular weight polyethylene (INHANCE, UH-1500, 45um) were subjected to urethane reaction to obtain H ₁₂ MDI type polyurethane prepolymer : 25%. Further, 64.3% by weight of an acrylic polyol (hydroxyl group-containing hydroxyl group: 34.3, NV% 66.6%), 33.9% by weight of Mixed Xylene (SK General Chemicals), 1% by weight of ethylene glycol (Honam Petrochemical) Were mixed to prepare a mixture (curing agent part). Topical part: The hardener part was adjusted to a weight ratio (1: 7.7) and NCO / OH INDEX 108 and uniformly mixed to prepare a polyurethane gel coat having a width of 100 mm.

Comparative Example 1 (IPDI type polyurethane gel coat)

18.4% by weight of polyether polyol PP-1000 (KPX chemical hydroxyl value: 108 to 116) and 81.6% by weight of isophorone diisocyanate (Vencorex, NCO content 37.5 to 37.8% by weight) 25% of NCO: polyurethane prepolymer (main part) was prepared. Further, 64.3% by weight of an acrylic polyol (hydroxyl group-containing hydroxyl group: 34.3, NV% 66.6%), 33.9% by weight of Mixed Xylene (SK General Chemicals), 1% by weight of ethylene glycol (Honam Petrochemical) Were mixed to prepare a mixture (curing agent part). Topical part: The hardener part was adjusted to a weight ratio (1: 7.7) and NCO / OH INDEX 108 and uniformly mixed to prepare a polyurethane gel coat having a width of 100 mm.

Comparative Example  2 ( H ₁₂ MDI  Type Polyurethane Gelcoat  Produce )

, NCO content 31.8~ 32.0% by weight) 83.1중량%를 적용하여 우레탄 반응시켜 H₁₂MDI 타입 폴리우레탄 프리폴리머(주제부) NCO: 25%를 제조 하였다. 추가로 경화제부로서 아크릴폴리올(수산고분자 수산기가: 34.3, NV% 66.6%) 64.3중량%와 Mixed Xylene(SK 종합화학) 33.9중량% 에틸렌 글리콜(호남석유화학) 1중량%, 기타 촉매 0.8중량%를 적용 혼합하여 혼합물(경화제부)를 제조 하였다. 주제부:경화제부를 무게비 (1 : 7.7), NCO/OH INDEX 108로 조절하고 균일하게 혼합하여 가로,세로 100mm의 폴리우레탄 겔코트를 제조하였다. 16.9% by weight of polyether polyol PP-1000 (KPX chemical hydroxyl value: 108 to 116), 4,4'-dicyclohexylmethane diisocyanate (EVONIK

And 83.1% by weight of NCO content 31.8 ~ 32.0% by weight) was applied to prepare an H ₁₂ MDI type polyurethane prepolymer (main part) NCO: 25%. Further, 64.3% by weight of an acrylic polyol (hydroxyl group-containing hydroxyl group: 34.3, NV% 66.6%), 33.9% by weight of Mixed Xylene (SK General Chemicals), 1% by weight of ethylene glycol (Honam Petrochemical) Were mixed to prepare a mixture (curing agent part). Topical part: The hardener part was adjusted to a weight ratio (1: 7.7) and NCO / OH INDEX 108 and uniformly mixed to prepare a polyurethane gel coat having a width of 100 mm.

Comparative Example 3 (manufactured by Isotype Iso type series UP gelcoat)

Unsaturated ISO / NPG polyester gelcoat resin was purchased and 2 wt% of the accelerator was applied uniformly to prepare a UP series gel coat having a width of 100 mm and a length of 100 mm.

Comparative Example 4 (Manufacture of UP type gelcoat of ortho type type)

Unsaturated oligo type polyester gelcoat resin was purchased and 1.8 wt% of the accelerator was uniformly mixed to prepare a UP series gel coat having a width of 100 mm and a length of 100 mm.

Comparative Example 5 (bisphenol type epoxy gelcoat)

A bisphenol type epoxy resin was purchased and uniformly mixed according to a prescribed mixing ratio (Resin 100: Curing Agent Part 10) to prepare an epoxy-based gel coat of 100 mm in width and length.

Evaluation example

After the gel coats of Examples 1 to 4 and Comparative Examples 1 to 5 were prepared, each of the test specimens (polyurethane gel coat film) was aged and cured for one week or more at 25 ° C and 65RH, and then KS M ISO 868 (plastic and ebonite - Measurement of hardness according to the method of indentation hardness measurement with a durometer), elongation was measured according to the method of KS M 6518 (physical test method of vulcanized rubber), ASTM D 4060 (abrasive wheel CS-17, 1 kg, ). The results are shown in Table 1 below. ≪ tb > < TABLE >

Table 1 (Abrasion resistance performance test result)

Referring to Table 1, it can be seen that the gelcoat membranes formed in Examples and Comparative Examples all have similar hardness and elongation, but there are many differences in abrasion resistance performance. In Examples 1, 2, 3 and 4, abrasion resistance performance was superior to Comparative Examples 1, 2, 3, 4 and 5. In Examples 1 and 2, reactive high molecular weight polyethylene was used in an amount of 15% by weight based on the total weight of the composition. In Examples 3 and 4, reactive high molecular weight polyethylene was used in an amount of 7.5% by weight based on the weight of the composition. It was confirmed that the wear resistance performance of the gel coat film formed in the final stage was improved as the content of the reactive high molecular weight polyethylene increased in the preparation of the gel coat paint. As described above, the gel coat paint of the present invention confirmed formation of a gel coat film having superior abrasion resistance performance than that of forming a gel coat film using an existing unsaturated polyester or epoxy-based gel coat.

Claims (12)

From 6 to 25% by weight of a reactive high molecular weight polyethylene having a number average molecular weight of from 3,000,000 to 5,000,000 g / mol, an average particle size of from 10 [mu] m to 300 [mu] m and an -OH functional group on the particle surface; 4 to 22% by weight of polyol or polyamine; And 60 to 86% by weight of a diisocyanate; And
Polyols; At least one crosslinking and chain extender selected from diols, triols, tetraols, diamines and amino amines; A curing agent part formed by mixing a catalyst and an organic solvent. delete 2. The two-component polyurethane according to claim 1, wherein the curing agent is formed by mixing 55 to 75 wt% of a polyol, 0.5 to 5 wt% of a crosslinking and chain extender, 0.5 to 2 wt% of a catalyst, Gelcoat paint. delete The two-part polyurethane gelcoat coating according to claim 1, further comprising 3 to 15% by weight of pigment. From 6 to 25% by weight of a reactive high molecular weight polyethylene having a number average molecular weight of from 3,000,000 to 5,000,000 g / mol, an average particle size of from 10 [mu] m to 300 [mu] And 60 to 86% by weight of a diisocyanate is subjected to a urethane reaction to prepare a polyurethane prepolymer main part; And
Polyols; At least one crosslinking and chain extender selected from diols, triols, tetraols, diamines and amino amines; And a step of mixing a catalyst and an organic solvent to prepare a curing agent part. 7. The composition of claim 6, wherein the curing agent is formed by mixing 55 to 75 wt% of a polyol, 0.5 to 5 wt% of a crosslinking and chain extender, 0.5 to 2 wt% of a catalyst, and an excess of an organic solvent. A method for producing a urethane gel coat paint. delete The method for producing a two-component polyurethane gelcoat paint according to claim 6, wherein 3 to 15% by weight of a pigment is further mixed. From 6 to 25% by weight of a reactive high molecular weight polyethylene having a number average molecular weight of from 3,000,000 to 5,000,000 g / mol, an average particle size of from 10 [mu] m to 300 [mu] And 60 to 86% by weight of a diisocyanate is urethane-reacted with a polyurethane prepolymer main part
Polyols; At least one crosslinking and chain extender selected from diols, triols, tetraols, diamines and amino amines; Preparing a two-pack type polyurethane gel coat paint comprising a curing agent portion formed by mixing a catalyst and an organic solvent;
Mixing the polyurethane prepolymer main portion and the curing agent portion of the two-component polyurethane gel coat paint to coat the surface of the object; And
And curing a two-pack type polyurethane gel coat paint coated on the surface of the object. The polyurethane gel according to claim 10, wherein the curing agent is formed by mixing 55 to 75 wt% of a polyol, 0.5 to 5 wt% of a crosslinking and chain extender, 0.5 to 2 wt% of a catalyst, Coat film forming method. delete