KR101470611B1 - Coating composition for surface treatment of rubber and method of preparing the same - Google Patents

Abstract

An aspect of the present invention provides a paint composition for surface treatment of a silicon rubber including based on the total amount of the paint composition, (i) 1-10 wt% of a silicon resin; (ii) 1-10 wt% of a polyurethane resin composition including 15-30 parts by weight of polyurethane, 1-10 parts by weight of a first additive, and 50-80 parts by weight of a first solvent; (iii) 1-5 wt% of polypropylene chloride; (iv) 1-5 wt% of wax; (v) 0.1-3 wt% of a quencher; (vi) 0.1-3 wt% of a second additive; and (vii) a remaining amount of a second solvent, where the solid content of the paint composition is 8-15 wt% based on the total amount of the paint composition, and provides a method of preparing the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition for a silicone rubber surface treatment,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition for rubber surface treatment and a method for producing the same, and more particularly, to a coating composition for surface treatment of a silicone rubber containing a polyurethane resin composition, .

The opening / closing part such as a joint part of an interior / exterior material of construction, a detachable part of an electronic device or a mechanical device, or a door of an automobile is generally provided as a part of an apparatus, a machine, and a facility. In order to improve airtightness and durability And is made of a rubber material such as an ethylene-propylene-diene terpolymer (EPDM) or an ethylene-propylene monomer (EPM) rubber.

In particular, a weatherstrip used in an automobile is applied to a sliding surface between a windowpane and a door or a contact surface between the door and a body paint surface, Heat resistance, cold resistance and water repellency, which are relative physical properties depending on external conditions such as temperature and humidity, are required as well as slip properties.

A method of using a curing type silicone oil or a noncuring type silicone oil as a coating agent for imparting slipperiness and water repellency to the surface of a weather strip has been proposed. However, since the curing type silicone oil or the noncuring type silicone oil is easily abraded due to friction, There is no persistence, and these silicone oils alone have no adhesion to the object to be coated and have no strength as a coating film.

On the other hand, there has been proposed a method of imparting an adhesive force to a coating composition by blending a silicone oil with a urethane resin or by using a polyisocyanate as a curing agent based on the adhesion of the urethane resin, but it has been found that while satisfying the abrasion resistance, And there is a disadvantage in that a rubbing sound is generated during ascending and descending of the window glass.

Further, in the case of such a urethane resin-silicone oil coating composition, it is difficult to prevent aggregation or aggregation of different molecules due to an electric interaction that can occur in a force-unlikely manner between the urethane resin and the silicone oil molecule, The intended function could not be realized based on the physical properties of each resin, and the storage stability of the coating composition deteriorated significantly during long-term storage.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a coating composition for rubber surface treatment which is excellent in abrasion resistance, slip resistance, and storage stability while blending silicone resin and polyurethane resin, .

In order to achieve the above object, one aspect of the present invention is a coating composition for rubber surface treatment, which comprises (i) 1 to 10% by weight of a silicone resin; (ii) 1 to 10% by weight of a polyurethane resin composition comprising 15 to 30 parts by weight of a polyurethane, 1 to 10 parts by weight of a first additive, and 50 to 80 parts by weight of a first solvent; (iii) 1 to 5% by weight of chlorinated polypropylene; (iv) 1 to 5% by weight of wax; (v) 0.1 to 3% by weight of quencher; (vi) 0.1 to 3% by weight of a second additive; And (vii) a second solvent, wherein the solid content of the coating composition is 8 to 15% by weight based on the total weight of the coating composition.

In one embodiment, the silicone resin may comprise from 2 to 10 parts by weight of a reactive silicone resin and from 0.1 to 5 parts by weight of a non-reactive silicone resin.

In one embodiment, the reactive silicone resin may be at least one selected from the group consisting of polymethylhydrosiloxane (PMHS) and hydroxyl terminated polydimethylsiloxane (PDMS).

In one embodiment, the first additive is a pigment; And at least one selected from the group consisting of anti-settling agents, antifoaming agents, wetting and dispersing agents, and surfactants.

In one embodiment, the average particle size of the pigment included in the first additive may be 1 to 10 탆.

In one embodiment, the second additive may comprise a pigment and an anti-settling agent.

In one embodiment, the first solvent and the second solvent may be at least one selected from the group consisting of esters, ethers, alcohols, ketones, and aromatic hydrocarbons.

In one embodiment, the light extinguishing agent is at least one inorganic quencher selected from the group consisting of silica, magnesium oxide, zirconia, alumina, and titania; Or at least one organic quencher selected from the group consisting of an acrylic resin, an epoxy resin, a urethane resin, a polyethylene resin, and a polytetrafluoroethylene resin.

According to another aspect of the present invention, there is provided a method for producing a coating composition for rubber surface treatment, comprising the steps of: (a) mixing 15 to 30 parts by weight of polyurethane, 1 to 10 parts by weight of a first additive And 50 to 80 parts by weight of the first solvent, followed by pulverization to prepare a polyurethane resin composition; And (b) 1 to 10% by weight, based on the total weight of the coating composition, of the polyurethane resin composition; 1 to 10% by weight of silicone resin; 1 to 5% by weight of chlorinated polypropylene; 1 to 5% by weight of wax; 0.1 to 3% by weight of quencher; 0.1 to 3% by weight of a second additive; And a second solvent of the remaining amount are added to a reaction vessel and stirred to disperse the wax. The present invention also provides a method for producing a coating composition for rubber surface treatment.

In one embodiment, the milling vessel may be one or more selected from the group consisting of a bead mill, an attrition mill, a basket mill, and a super mill .

In one embodiment, the silicone resin may comprise from 2 to 10 parts by weight of a reactive silicone resin and from 0.1 to 5 parts by weight of a non-reactive silicone resin.

In one embodiment, the reactive silicone resin may be at least one selected from the group consisting of polymethylhydrosiloxane (PMHS) and hydroxyl terminated polydimethylsiloxane (PDMS).

In one embodiment, the first additive is a pigment; And at least one selected from the group consisting of anti-settling agents, antifoaming agents, wetting and dispersing agents, and surfactants.

In one embodiment, in the step (a), the pulverization may be performed until the average particle size of the pigment included in the first additive is 1 to 10 탆.

In one embodiment, the second additive may comprise a pigment and an anti-settling agent.

In one embodiment, the first solvent and the second solvent may be at least one selected from the group consisting of esters, ethers, alcohols, ketones, and aromatic hydrocarbons.

In one embodiment, the light extinguishing agent is at least one inorganic quencher selected from the group consisting of silica, magnesium oxide, zirconia, alumina, and titania; Or at least one organic quencher selected from the group consisting of an acrylic resin, an epoxy resin, a urethane resin, a polyethylene resin, and a polytetrafluoroethylene resin.

According to one embodiment of the present invention, by using a polyurethane resin composition of a type of primary processed and mixed with polyurethane, an additive, and a solvent mixed with a silicone resin, At the same time, the adhesive strength, abrasion resistance and slipperiness of each of the silicone resin and the polyurethane can be maintained, and the storage stability and durability of the coating composition can be improved.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a schematic view showing a method for producing a coating composition for rubber surface treatment according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Coating composition for rubber surface treatment

According to one aspect of the present invention, there is provided a coating composition for rubber surface treatment, which comprises (i) 1 to 10% by weight of a silicone resin, based on the total weight of the coating composition; (ii) 1 to 10% by weight of a polyurethane resin composition comprising 15 to 30 parts by weight of a polyurethane, 1 to 10 parts by weight of a first additive, and 50 to 80 parts by weight of a first solvent; (iii) 1 to 5% by weight of chlorinated polypropylene; (iv) 1 to 5% by weight of wax; (v) 0.1 to 3% by weight of quencher; (vi) 0.1 to 3% by weight of a second additive; And (vii) a second solvent, wherein the solid content of the coating composition is 8 to 15% by weight based on the total weight of the coating composition.

The silicone resin generally refers to a polymer having a main chain of a bond of silicon and oxygen, but in the present invention means a mixture comprising a reactive silicone resin and a non-reactive silicone resin.

The silicone resin may be contained as a main part or a main resin of the rubber surface treatment coating composition in an amount of 1 to 10% by weight based on the total weight of the coating composition. If the content of the silicone resin is out of the above range, the surface of the rubber base coated with the coating composition may be frozen at a low temperature, and the elasticity and durability of the rubber base may be deteriorated.

In one embodiment, the silicone resin may comprise from 2 to 10 parts by weight of a reactive silicone resin and from 0.1 to 5 parts by weight of a non-reactive silicone resin.

As used herein, the term "reactive silicone resin" is a silicone resin to which a reactive functional group such as an epoxy group, an amino group, or a carboxyl group is bonded to a polysiloxane main chain composed of silicon and oxygen and can be cured by heat, Resin "or" silicone rubber ".

The reaction type silicone resin may be used alone or in combination of two or more types of curable silicon having different molecular weights or may be mixed with a curable silicone having another functional group.

In one embodiment, the reactive silicone resin may include polymethylhydrosiloxane (PMHS) represented by the following formula (1) and hydroxyl terminated polydimethylsiloxane (PDMS, hydroxyl terminated) represented by the following formula Or a mixture thereof can be used.

[Chemical Formula 1]

(Wherein n is an integer of 1 or more)

(2)

(In the above formula (2), n is an integer of 1 or more)

In particular, the hydroxyl-terminated polydimethylsiloxane has -H functional groups and -OH functional groups at both ends and can be self-curing under a catalyst.

The catalyst involved in curing the silicone resin may be at least one selected from the group consisting of dibutyl tin diacetate, dibutyl tin dilaurate, dibutyl tin dioctoate, mercaptantin, and dioctyl tinolate, May be, but is not limited to, dibutyl tin diacetate.

As used herein, the term "non-reactive silicone resin" is also referred to as "non-curable silicone resin" or "silicone oil " since silicone resin to which a non-reactive functional group such as a methyl group is bonded to the polysiloxane main chain is non-

The non-reactive silicone resin acts as a lubricant. When used alone, the non-reactive silicone resin tends to be worn and has no adhesiveness. When used in combination with the reactive silicone resin, the reactive silicone resin has abrasion resistance The non-reactive silicone resin can improve the long-term durability and non-sticking property of the coating composition and reduce or eliminate the frictional force on the surface of the rubber base material.

In one embodiment, polydimethylsiloxane (PDMS) represented by the following formula 3 may be used as the non-reactive silicone resin.

(3)

(In the above formula (3), n is an integer of 1 or more)

In one embodiment, the reactive silicone resin and the non-reactive silicone resin may be contained in the silicone resin in a ratio of 2 to 10 parts by weight: 0.1 to 5 parts by weight, respectively. If the content of the reactive silicone resin is less than 2 parts by weight, water repellency can not be imparted to the formed coating film, and if it exceeds 10 parts by weight, abrasion resistance may be deteriorated. If the content of the non-reactive silicone resin is less than 0.1 parts by weight, the long-term durability and storage stability of the coating composition may be deteriorated. If the amount is more than 5 parts by weight, the adhesive strength of the coating composition may be deteriorated.

The polyurethane resin composition may contain 15 to 30 parts by weight of polyurethane, 1 to 10 parts by weight of a first additive, and 50 to 80 parts by weight of a first solvent, 10% by weight.

Conventionally, coating compositions containing a polyurethane component have generally been prepared by simultaneously blending polyurethane powders, solvents, and other additive components. On the other hand, the coating composition for rubber surface treatment of the present invention is prepared by mixing and grinding a polyurethane, a first additive, and a first solvent to prepare a polyurethane resin composition, which is first processed in a dispersion form, It is possible to improve the compatibility with the silicone resin and to maintain the adhesive strength, abrasion resistance and slip property of each of the silicone resin and the polyurethane, and to improve the storage stability and long-term durability of the coating composition.

The polyurethane resin composition acts as a binder for the wax to improve the adhesion between the coating composition and the rubber base material. When the content of the polyurethane resin composition is less than 1% by weight, If it is more than 10% by weight, surface roughness may be developed and noise (friction noise) may occur.

The polyurethane is a main part of the polyurethane resin composition which is a constituent of the rubber surface treatment coating composition and is generally produced by a reaction between a compound having a hydroxyl group (-OH) and a compound having an isocyanate group (-NCO) Refers to a polymer obtained by an addition polymerization reaction of an isocyanate and a polyol in the present invention.

The isocyanate may be selected from the group consisting of 4,4'-diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), and hexamethylene diisocyanate (HDI) And may be one or more selected, and preferably toluene diisocyanate (TDI), but is not limited thereto.

The polyol may be selected from the group consisting of polytetramethylene glycol (PTMG), polypropylene glycol (PPG), polycarbonate diol (PCD), adipic acid and 1,4-butylene glycol (BG) May be one or more selected from the group consisting of polymerized polyester polyols, and preferably polyester polyols obtained by polymerizing adipic acid and 1,4-butylene glycol (BG) , But is not limited thereto.

The weight average molecular weight (Mw) of the polyester polyol may be 1,000 to 4,000, preferably 1,500 to 2,500, and more preferably 1,800 to 2,300. If the weight average molecular weight (Mw) of the polyester polyol is less than 1,000, the reactivity becomes excessively high to increase the hardness of the coating composition, resulting in deterioration in workability. If the polyester polyol is more than 4,000, softness is increased Abrasion resistance may be deteriorated.

The isocyanate and the polyol may be reacted at a ratio of 10 to 20 parts by weight, 15 to 25 parts by weight, preferably 13 to 18 parts by weight, and 18 to 21 parts by weight, respectively. If the weight ratio of the isocyanate is out of the above range, the adhesion with the rubber base material may be deteriorated. If the weight ratio of the polyol is out of the above range, the softness may be increased and the abrasion resistance may be deteriorated.

The polyurethane resin composition is a mixture of 20 to 50 parts by weight of polyurethane, a first additive and a first solvent in a proportion of 5 to 10 parts by weight and 50 to 80 parts by weight, respectively, wherein the content of the polyurethane is 20 If the amount is less than 10 parts by weight, the abrasion resistance of the coating composition may be deteriorated. If the amount is more than 50 parts by weight, noise (friction noise) may occur.

Meanwhile, the coating composition may include chlorinated polypropylene as an adhesion promoting agent.

The chlorinated polypropylene may have a chlorine content of 20 to 30 wt%, preferably 22.5 to 26.5 wt%. If the content of chlorine is less than 22.5% by weight, the adhesive strength may be lowered. If the chlorine content is more than 26.5% by weight, the adhesive strength may be lowered, and whitening may occur, have.

The chlorinated polypropylene may be contained in an amount of 1 to 5% by weight based on the total weight of the coating composition. If the content of the chlorinated polypropylene is less than 1% by weight, sufficient adhesion can not be provided with respect to the film surface. If the content of the chlorinated polypropylene exceeds 5% by weight, layer separation may occur during the production of the coating composition.

Meanwhile, the coating composition may contain wax or powder to improve tactility and durability.

Usable waxes or powders may be selected from the group consisting of polytetrafluoroethylene (PTFE) powder, polyethylene (PE) powder, polypropylene (PP) powder, ceramic powder, carbon powder, silica or silicone powder, acrylic powder, urethane powder, Polyethylene wax, silicone wax, and a synthetic denatured powder blended with the above-mentioned materials, and at least one selected from the group consisting of polyethylene / PTFE / amide denatured, polyethylene / PTFE denatured, or polyethylene / amide denatured powder May be used or mixed, preferably polyethylene wax or polyethylene powder, but is not limited thereto.

The average particle size of the wax or powder may be 4 to 20 占 퐉, preferably 5 to 10 占 퐉 in consideration of the surface appearance quality and workability of the rubber base material.

The wax or the powder may be contained in an amount of 1 to 5% by weight based on the total weight of the coating composition. If the content of the wax or powder is less than 1 wt%, the abrasion resistance may be deteriorated. If the wax or powder is more than 5 wt%, scratch marks may be formed on the surface of the rubber substrate during the operation, thereby deteriorating the surface appearance quality.

On the other hand, the coating composition may contain a quenching agent to lower the gloss of the coating material to improve workability and hiding power.

The quencher may be included in an amount of 0.1 to 3% by weight based on the total weight of the coating composition. It is preferable to control the content of the quencher within the above range in terms of workability, glossiness, and surface appearance quality of the rubber base material.

In one embodiment, the light extinguishing agent is at least one inorganic quencher selected from the group consisting of silica, magnesium oxide, zirconia, alumina, and titania; Or an organic quencher selected from the group consisting of an acrylic resin, an epoxy resin, a urethane resin, a polyethylene resin, and a polytetrafluoroethylene resin, preferably silica, more preferably an average particle size of 5 To 10 [micro] m.

In addition, the inorganic quencher and the organic quencher may be used in combination in order to impart adhesion and workability to the rubber base during the operation. The mixing ratio of the inorganic quencher and the organic quencher may be 1: 1 to 3, preferably 1: 1 to 2, based on the weight. When the inorganic quencher is used together with the organic quencher, an organic-inorganic hybrid network crosslinking by ester bond is formed, and a strong coating film can be formed by the organic-inorganic hybrid network crosslinking.

On the other hand, the coating composition may further contain additives as required.

In one embodiment, the first additive is a pigment; And an anti-settling agent, a defoaming agent, a wetting and dispersing agent, and a surfactant, and the second additive may include a pigment and an amide-based anti-settling agent.

Wherein the first additive is contained in the polyurethane resin composition which is one constituent of the paint composition and the second additive is a constituent of the paint composition and the storage stability of the polyurethane resin composition and the paint composition and the long- It is added to improve durability.

That is, the first additive is added to the polyurethane resin composition, and the second additive is added to the paint composition comprising the silicone resin and the polyurethane resin composition. Therefore, the first additive and the second additive May be used in combination, and the same ones may be used in consideration of the unit cost of production.

The first additive comprises a pigment; And at least one additive selected from the group consisting of anti-settling agents, anti-foaming agents, wetting and dispersing agents, and surfactants, preferably including pigments, anti-settling agents, antifoaming agents and wetting and dispersing agents, can do. As the pigment, a black pigment may be used.

In one embodiment, the average particle size of the pigment included in the first additive may be 1 to 10 탆, preferably 1 to 8 탆, and more preferably 4 to 7 탆. The average particle size of the pigment is an important factor controlling the viscosity of the polyurethane and the solid content of the polyurethane resin composition containing the same.

When the average particle size of the pigment included in the first additive is within the above range, the viscosity of the polyurethane may be 55,000 to 65,000 cps (25 ° C), preferably 59,000 to 61,000 (25 ° C) , And the solid content of the polyurethane resin composition may be 20 to 30% by weight based on the total weight of the polyurethane resin composition.

If the viscosity of the polyurethane and the solid content of the polyurethane resin composition containing the polyurethane resin are out of the above ranges, the flowability of the coating composition becomes excessively high, resulting in deterioration in workability. Accordingly, The smoothness of the applied rubber base surface may be lowered.

The second additive may include at least one of a pigment and an anti-settling agent, and may preferably include a pigment and an anti-settling agent. More preferably, the black pigment is pigmented with the pigment, the amide- An inhibitor may be used.

The amide-based anti-settling agent may be used as an additive added to prevent settling of a heavy component such as a black pigment in a coating composition, for example, a polyamide prepared from a fatty acid and a polyamine. The amide-based anti-settling agent can be added to the coating composition to form a flaky structure, thereby exhibiting an anti-settling effect, and improving the whiteness and thermal stability of the coating composition due to the network structure of the swollen particles.

The second additive may be included in an amount of 0.1 to 3% by weight based on the total weight of the coating composition. If the content of the second additive is less than 0.1% by weight, the storage stability and long-term durability of the coating composition may be deteriorated. If the content is more than 3% by weight, the dispersibility may be excessively increased.

On the other hand, the first solvent and the second solvent usable in the rubber surface treatment coating composition may be at least one selected from the group consisting of esters, ethers, alcohols, ketones, and aromatic hydrocarbons, Preferably, a petroleum solvent may be mixed as a preservative to dilute the dissolved particles. The first solvent and the second solvent may be the same or different solvents may be used in combination.

Examples of the ester-based solvent include, but are not limited to, ethyl acetate, n-butyl acetate, cellosolve acetate, propylene glycol monomethyl acetate, and 3-methoxybutyl acetate.

Examples of the ether-based solvent include, but are not limited to, methyl cellosolve, ethyl cellosolve, ethylene glycol butyl ether, diethylene glycol methyl ether, diethylene glycol ethyl ether, and diethylene glycol butyl ether.

Examples of the alcohol-based solvent include, but are not limited to, ethanol, isopropanol, n-butanol, methyl alcohol, amyl alcohol and cyclohexanol.

Examples of the ketone-based solvent include cyclohexanone, methyl amyl ketone, diisobutyl ketone, and methyl ethyl ketone, but are not limited thereto.

Examples of the aromatic hydrocarbon-based solvent include, but are not limited to, benzene, toluene, xylene, and the like.

Examples of the petroleum composition include coco sol # 100 and coco sol # 150, but the present invention is not limited thereto.

On the other hand, the solid content of the coating composition may be 8 to 15% by weight, preferably 9 to 14% by weight, more preferably 10 to 13% by weight based on the total weight of the coating composition.

As used herein, the term "solids" refers to the amount of active ingredient remaining in the solid state after evaporation of moisture and other liquid components of the liquid substance.

Generally, the content of the solid content in the coating composition directly affects the viscosity of the coating composition and the thickness of the coating film, which is an important factor determining the workability and smoothness of the coating film. If the content of the solid content in the coating composition is less than 8% by weight, it is difficult to control the flowability of the coating composition, and if it exceeds 15% by weight, the workability may be deteriorated.

Method for producing coating composition for rubber surface treatment

1, a method for producing a coating composition for rubber surface treatment according to another aspect of the present invention comprises the steps of: (a) mixing 15 to 30 parts by weight of polyurethane 1 to 10 parts by weight of a first additive, and 50 to 80 parts by weight of a first solvent, followed by pulverization to prepare a polyurethane resin composition (S100); And (b) 1 to 10% by weight, based on the total weight of the coating composition, of the polyurethane resin composition; 1 to 10% by weight of silicone resin; 1 to 5% by weight of chlorinated polypropylene; 1 to 5% by weight of wax; 0.1 to 3% by weight of quencher; 0.1 to 3% by weight of a second additive; And a second solvent of a remaining amount are added to a reaction vessel and then stirred to disperse the wax (S200).

Conventionally, in the case of a coating composition for rubber surface treatment comprising a silicone resin and a polyurethane resin, it has been found that when a raw silicone resin is combined with a polyurethane resin, coagulation and agglomeration due to intermolecular electrical interactions And the intended function could not be realized based on the physical properties of each of the silicone resin and the polyurethane resin, and the storage stability of the coating composition deteriorated significantly during long-term storage.

In step (a), the pulverization vessel is charged with 15 to 30 parts by weight of polyurethane, 1 to 10 parts by weight of a first additive, and 50 to 80 parts by weight of a first solvent (S110) S120) to prepare a polyurethane resin composition, which is an intermediate used in the preparation of a coating composition. By using a polyurethane resin composition that is primarily processed together with a first additive and a first solvent, At the same time, the function of the polyurethane is maintained, and the storage stability and long-term durability of the coating composition can be improved.

In one embodiment, the milling vessel may be at least one selected from the group consisting of a bead mill, an attrition mill, a basket mill, and a super mill, , Preferably a basket mill, but is not limited thereto.

In the step (a), the pulverization (S120) may be performed until the average particle size of the pigment included in the first additive is 1 to 10 mu m. The average particle size of the pigment is an important factor controlling the viscosity of the polyurethane and the solid content of the polyurethane resin composition containing the same. When the average particle size of the pigment is within the above range, the viscosity of the polyurethane is 55,000 ~ And the solid content of the polyurethane resin composition may be 20 to 30% by weight based on the total weight of the polyurethane resin composition, . The composition and composition of the first additive used to prepare the polyurethane resin composition are as described above.

Meanwhile, the step (b) (S200) may include a step of reacting the polyurethane resin composition, the silicone resin, the chlorinated polypropylene, the wax, the quencher, and the second additive , And a second solvent are added to the reaction vessel (S210), followed by stirring to disperse the wax in the coating composition (S220), thereby producing a final coating composition for rubber surface treatment.

The reaction vessel may be a known stirrer including a motor, a driving shaft, a stirring system equipped with a blade, and a reaction tank. However, the wax or powder is a solid material having a solid content of 100% by weight, which is difficult to be uniformly dispersed in the coating composition, in order to improve the feel and durability of the coating composition.

Therefore, in order to uniformly disperse the wax or the powder, the rotation speed of the blade, that is, the stirring speed should be accelerated and maintained to a certain level or higher, and the stirring speed in the step (b) may be 1,000 to 3,000 rpm , Preferably from 1,500 to 2,000 rpm. If the stirring speed is less than 1,500 rpm, the uniformity of dispersion of the wax or powder may be lowered. If the stirring speed is more than 2,000 rpm, the blade may be damaged or the inside of the reaction tank may be contaminated.

The composition, content, and kinds, physical properties, and effects of the materials usable as the respective components of the rubber surface treatment coating composition are as described above.

Hereinafter, embodiments of the present invention will be described in detail.

Example  One

Polyurethane and a solvent were added to a basket mill to which 1.2 mm zirconium beads had been applied. Further, an anti-settling agent, a pigment, a defoamer, a wetting and dispersing agent and a surfactant were further added as an additive and then pulverized until the average particle size of the pigment became 1 탆 , And a solid content of 26.5% by weight.

(PMHS, PDMS (hydroxyl terminated), and PDMS), chlorinated polypropylene, polyethylene wax, silica, and a solvent are added to a stirrer, and the amide-based anti-settling agent and pigment are additionally administered Thereafter, the mixture was stirred at 1,500 rpm at a high speed to uniformly disperse the wax in the coating composition, to thereby prepare a coating composition for rubber surface treatment having a solid content of 10.3% by weight.

Example  2

The content of the polyurethane and the solvent used in the production of the polyurethane resin composition and the content of the silicone resin and the solvent used in the preparation of the coating composition were partially changed and the mixture was pulverized until the average particle size of the pigment was 5 탆, rpm, a coating composition for rubber surface treatment having a solid content of 11.2 wt% was prepared in the same manner as in Example 1. [

Example  3

The content of the polyurethane and the solvent used in the production of the polyurethane resin composition and the content of the silicone resin and the solvent used in the preparation of the coating composition were partially changed and the pulverization was carried out until the average particle size of the pigment was 5 탆, rpm, a coating composition for rubber surface treatment having a solid content of 12.8% by weight was prepared in the same manner as in Example 1. [

Example  4

The content of the polyurethane and the solvent used in the preparation of the polyurethane resin composition and the content of the silicone resin and the solvent used in the preparation of the coating composition were partially changed and the pulverization was carried out until the average particle size of the pigment was 10 탆, rpm, a coating composition for rubber surface treatment having a solid content of 14.2% by weight was prepared in the same manner as in Example 1. [

Comparative Example  One

The content of the polyurethane and the solvent used in the preparation of the polyurethane resin composition and the content of the silicone resin and the solvent used in the preparation of the coating composition were partially changed and the stirring speed was lowered to 1,000 rpm to obtain a polyurethane resin composition having a solid content of 37.2% To prepare a coating composition for rubber surface treatment.

Comparative Example  2

The content of the polyurethane and the solvent used in the production of the polyurethane resin composition and the content of the silicone resin and the solvent used in the preparation of the coating composition were partially changed and the polyurethane resin composition was pulverized until the average particle size of the pigment became 15 탆 , A coating composition for rubber surface treatment having a solid content of 29.2% by weight was prepared.

Comparative Example  3

The content of the polyurethane and the solvent used in the preparation of the polyurethane resin composition and the content of the silicone resin and the solvent used in the preparation of the coating composition were partially changed and the polyurethane resin composition was pulverized until the average particle size of the pigment became 12 탆 , And a coating composition for surface treatment of rubber having a solid content of 33.1 wt% was prepared in the same manner as in Example 1, except that the stirring speed was adjusted to 2,200 rpm.

Comparative Example  4

As a conventional two-pack type polyurethane-silicone resin coating composition, an untreated polyurethane resin, a silicone resin, a chlorinated polypropylene, a polyethylene wax, silica and a solvent are added to a stirrer, and an anti-settling agent and a pigment are added A coating composition for rubber surface treatment having a solid content of 31.5% by weight was prepared in the same manner as in Example 1.

The composition and contents of the coating compositions prepared according to Examples 1 to 4 and Comparative Examples 1 to 4 are shown in Table 1 below.

ingredient Example
One Example
2 Example
3 Example
4 Comparative Example
One Comparative Example
2 Comparative Example
3 Comparative Example
4 Silicone resin PMHS
+
PDMS, hydroxyl terminated 2.79 3.00 4.15 5.20 14.2 9.30 9.30 9.30 PDMS 0.37 1.00 1.00 1.20 6.8 3.70 3.70 3.70 Polyurethane Polyurethane 1.64 1.64 2.15 2.32 3.50 3.50 4.71 3.50 Suzy
Composition solvent 5.50 6.00 6.20 6.70 7.00 7.00 8.50 - Anti-settling agent 0.06 0.06 0.06 0.06 0.06 0.06 0.06 - Pigment content 0.16 0.16 0.16 0.16 0.16 0.16 0.16 - Average particle size
(탆) One 5 5 10 One 15 12 One Defoamer 0.06 0.06 0.06 0.06 0.06 0.06 0.06 - Wet dispersant 0.04 0.04 0.04 0.04 0.04 0.04 0.04 - Surfactants 0.02 0.02 0.02 0.02 0.02 0.02 0.02 - Solid content (wt%) of polyurethane resin composition 26.5 24.8 28.7 28.4 35.4 35.4 37.3 100.0 Chlorinated polypropylene 1.72 1.72 1.72 1.72 6.00 6.00 8.60 8.60 Polyethylene wax 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 Silica 0.80 0.80 0.80 0.80 0.80 0.80 0.80 0.80 Pigment 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 Amide-based anti-settling agent 0.15 0.15 0.15 0.15 3.00 3.00 3.10 3.10 solvent 84.175 82.835 80.975 79.055 55.845 63.845 58.435 68.485 Total solid content (wt%) 10.3 11.2 12.8 14.2 37.2 29.2 33.1 31.5 Stirring speed (rpm) 1,500 1,800 1,900 2,000 1,000 1,500 2,200 1,500

Experimental Example  1: Abrasion resistance test

After the coated specimens of Examples 1 to 4 and Comparative Examples 1 to 4 were prepared, they were reciprocated by applying a load of 1 kg to a cylindrical jig having a diameter of 30 mm and a width of 50 mm attached with a nonwoven fabric. The number of reciprocations to the point at which the coating composition film was broken and the rubber surface was damaged was recorded.

Experimental Example  2: Evaluation of friction noise and appearance condition

After the specimens of Examples 1 to 4 and Comparative Examples 1 to 4 were prepared, the noise generated when the same specimens were rubbed with each other was measured, and the surface smoothness and linearity of each specimen were visually confirmed.

Experimental Example  3: Heat resistance and cold resistance test

The specimen was left in a dry oven at 80 ℃ for 360 hours to observe the change compared to the initial surface condition. After standing at -30 ° C for 4 hours, the surface of the coating film was observed by winding it around a Φ500,000 drill.

Experimental Example  4: Adhesion test

A specimen was prepared using a cross-hatch with 100 grids at 20 mm. The tape was rubbed against the latticed portion of the specimen, and the tape was instantly peeled off in the direction of 45 ° to the surface, and the degree of transfer of the coating to the tape was observed.

The results of the experiments for Examples 1 to 4 and Comparative Examples 1 to 4 are shown in Table 2 above.

Paint Properties Example
One Example
2 Example
3 Example
4 Comparative Example
One Comparative Example
2 Comparative Example
3 Comparative Example
4 Abrasion resistance (times / 1kg load) 2,500 2,600 3,000 3,200 3,500 3,100 3,100 3,000 Appearance condition ◎ ◎ ◎ △ △ X X X Noise (friction noise) ◎ ○ △ △ X X X X Heat resistance (80 ℃) ◎ ◎ ○ ○ ○ △ X △ Cold resistance (-30 ℃) ◎ ○ ◎ △ △ X △ X Adhesion ◎ ◎ ◎ ◎ △ ○ ○ △

(?: Very good /?: Good /?: Normal / X: poor)

Referring to Table 2, the abrasion resistance of Comparative Examples 1 to 4 was superior to those of Examples 1 to 4. However, the above results are based on the fact that the higher the content of polyurethane in the paint, the better the abrasion resistance of the specimen is, and the abrasion resistance of the embodiment is recorded as 2,500 (times / 1kg load) Respectively.

On the other hand, the appearance state and friction noise of Examples 1 to 4 were relatively superior to those of Comparative Examples 1 to 4. As described above, the higher the content of polyurethane in the paint, the better the abrasion resistance. However, since the roughness of the surface is lowered and the friction noise is generated, the abrasion resistance and the appearance state, or the abrasion resistance and friction noise Are in a complementary relationship. Particularly, when comparing the appearance state and the friction noise of the example 1 and the comparative examples 1 to 4, the appearance state and the friction noise of the comparative examples 1 to 4 were largely inferior to those of the example 1, It was confirmed that both the appearance state and the friction noise were satisfactory while the wear resistance was higher than the required level.

In addition, the main feature of the present invention is that a polyurethane resin composition, which is primarily processed in the form of an intermediate composition, is incorporated into a coating material. Examples 1 to 4 and Experiment 4 of Comparative Example 4 in which a powdery polyurethane is intact Comparing the results, in Comparative Example 4, the external appearance of the test piece and the friction noise were significantly poorer than those of Examples 1 to 4, and it was found that the test piece coated with the coating composition of the present invention exhibited wear resistance, appearance, It was confirmed that all of the samples had good characteristics.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (17)

A coating composition for rubber surface treatment,
Based on the total weight of the coating composition, (i) 1 to 10% by weight of a silicone resin; (ii) 1 to 10% by weight of a polyurethane resin composition comprising 15 to 30 parts by weight of a polyurethane, 1 to 10 parts by weight of a first additive, and 50 to 80 parts by weight of a first solvent; (iii) 1 to 5% by weight of chlorinated polypropylene; (iv) 1 to 5% by weight of wax; (v) 0.1 to 3% by weight of quencher; (vi) 0.1 to 3% by weight of a second additive; And (vii) a second amount of a second solvent,
Wherein the solid content of the polyurethane resin composition is 20 to 30% by weight based on the total weight of the polyurethane resin composition,
Wherein the chlorinated polypropylene has a chlorine content of 22.5 to 26.5 wt% based on the total weight of the chlorinated polypropylene,
Wherein the solid content in the coating composition is 8 to 15% by weight based on the total weight of the coating composition.
The method according to claim 1,
Wherein the silicone resin comprises 2 to 10 parts by weight of a reactive silicone resin and 0.1 to 5 parts by weight of a non-reactive silicone resin.
3. The method of claim 2,
Wherein the reactive silicone resin is at least one selected from the group consisting of polymethylhydrosiloxane (PMHS), and hydroxyl terminated polydimethylsiloxane (PDMS, hydroxyl terminated).
The method according to claim 1,
Wherein the first additive is a pigment; And at least one selected from the group consisting of an anti-settling agent, a defoaming agent, a wetting and dispersing agent, and a surfactant.
5. The method of claim 4,
Wherein the average particle size of the pigment contained in the first additive is 1 to 10 占 퐉.
The method according to claim 1,
Wherein the second additive comprises a pigment and an amide-based anti-settling agent.
The method according to claim 1,
Wherein the first solvent and the second solvent are at least one selected from the group consisting of esters, ethers, alcohols, ketones, and aromatic hydrocarbons.
The method according to claim 1,
At least one inorganic quencher selected from the group consisting of silica, magnesium oxide, zirconia, alumina, and titania; Or at least one organic quencher selected from the group consisting of an acrylic resin, an epoxy resin, a urethane resin, a polyethylene resin, and a polytetrafluoroethylene resin.
A method for producing a coating composition for rubber surface treatment,
(a) preparing a polyurethane resin composition by adding 15 to 30 parts by weight of polyurethane, 1 to 10 parts by weight of a first additive and 50 to 80 parts by weight of a first solvent to a pulverizing vessel, followed by pulverization; And
(b) 1 to 10% by weight, based on the total weight of the coating composition, of the polyurethane resin composition; 1 to 10% by weight of silicone resin; 1 to 5% by weight of chlorinated polypropylene; 1 to 5% by weight of wax; 0.1 to 3% by weight of quencher; 0.1 to 3% by weight of a second additive; And a second solvent of a remaining amount are added to a reaction vessel and stirred to disperse the wax,
Wherein the chlorinated polypropylene has a chlorine content of 22.5 to 26.5% by weight based on the total weight of the chlorinated polypropylene and a stirring speed of 1,500 to 2,000 rpm in the step (b) .
10. The method of claim 9,
Wherein the pulverizing vessel is at least one selected from the group consisting of a bead mill, an attrition mill, and a basket mill.
10. The method of claim 9,
Wherein the silicone resin comprises 2 to 10 parts by weight of a reactive silicone resin and 0.1 to 5 parts by weight of a non-reactive silicone resin.
12. The method of claim 11,
Wherein the reactive silicone resin is at least one selected from the group consisting of polymethylhydrosiloxane (PMHS), and hydroxyl terminated polydimethylsiloxane (PDMS, hydroxyl terminated).
10. The method of claim 9,
Wherein the first additive is a pigment; And at least one selected from the group consisting of anti-settling agents, antifoaming agents, wetting and dispersing agents, and surfactants.
14. The method of claim 13,
Wherein the pulverization is carried out in step (a) until the average particle size of the pigment contained in the first additive is 1 to 10 占 퐉.
10. The method of claim 9,
Wherein the second additive comprises a pigment and an amide-based anti-settling agent.
10. The method of claim 9,
Wherein the first solvent and the second solvent are at least one selected from the group consisting of esters, ethers, alcohols, ketones, and aromatic hydrocarbon solvents.
10. The method of claim 9,
At least one inorganic quencher selected from the group consisting of silica, magnesium oxide, zirconia, alumina, and titania; Or at least one organic quencher selected from the group consisting of an acrylic resin, an epoxy resin, a urethane resin, a polyethylene resin, and a polytetrafluoroethylene resin.

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