KR102132240B1 - A coating composition for improving durability of elastic bearing - Google Patents

Abstract

The present invention relates to a coating composition for enhancing the durability of an elastic bearing, and more specifically, to a coating composition for enhancing the durability of an elastic bearing, comprising: a thermoplastic rubber; a solvent; a polyurethane resin; an acrylic resin; sodium silicate; a silane coupling agent; a UV absorbent; and a heat stabilizer. The present invention may provide a coating composition for enhancing the durability of an elastic bearing, which exhibits excellent adhesive strength to an elastic rubber and is excellent in terms of elasticity, waterproofness, water resistance, weathering, ozone resistance, UV-blocking ability, wear resistance, shock resistance, heat resistance, durability, and the like. Further, the present invention may provide an elastic bridge bearing, which by comprising a coating layer coated on the outer surface and side surfaces of the elastic rubber and a protection film to be attached to the coating layer, does not suffer ageing, breakage, damage and cracking due to temperature changes, UV rays, ozone, moisture, wastewater, heat, cold, and the like, and thus can be reliably used for a long time.

Description

A coating composition for improving durability of elastic bearing

The present invention relates to a coating composition for improving the durability of the elastic support, more specifically, a thermoplastic rubber; menstruum; Polyurethane resins; Acrylic resin; Sodium silicate; Silane coupling agents; Ultraviolet absorbers; And it relates to a coating composition for improving the durability of the elastic support comprising a heat stabilizer.

In general, bridges are installed between a plurality of bridges with a predetermined distance between two shifts, superstructures continuously installed on top of each bridge, and between bridges and superstructures to absorb loads, shocks, and deformations of superstructures. It consists of a bridge bearing.

The bridge bearing uses an elastic rubber between the upper plate and the lower plate to efficiently absorb the applied load and impact. Since the elastic rubber is exposed and used outside, temperature changes, ultraviolet rays, ozone, moisture, heat, The surface cracks or ages due to cold air, sewage, etc., that is, a coating cracking phenomenon occurs and cannot be used stably for a long time.

When the coating crack occurs, the mechanical properties, thermal properties, durability, etc. of the elastic rubber are continuously sharply deteriorated, and the load, impact, and deformation absorption characteristics of the bridge bearing deteriorate, which can cause serious safety problems of the bridge.

In order to solve this problem, technology development has been actively made to improve the durability of the elastic rubber.

In this regard, Korean Patent Publication No. 10-2010-0042094 includes cutting a road pavement layer on a stretch joint to form a connection groove having a predetermined width and depth; Forming a suture layer by primary curing after laying a road suture in the connection groove; Forming a silica sand layer by spraying silica sand on an upper surface of the encapsulant layer and compacting under a certain pressure; And it discloses a method of constructing a new joint of a bridge or structure using silica sand, characterized in that it comprises the step of second curing the encapsulant layer including the silica sand layer.

However, this technology is to recover the damaged area by removing the damaged or damaged area and then charging a new material to repair the damaged area. This can happen again.

Korean Patent Publication No. 10-2010-0042094

The present invention is to solve the problems of the prior art, excellent elasticity of the adhesive with the elastic rubber, elasticity, waterproof, water resistance, weather resistance, ozone resistance, UV protection, abrasion resistance, impact resistance, heat resistance, durability and excellent elasticity It is an object of the present invention to provide a coating composition for enhancing durability of a base.

In addition, the present invention is a coating layer coated on the surface and side of the elastic rubber; And by including a protective film adhered to the coating layer, the elastic support for the bridge that can be used stably for a long time without aging, breakage, damage and cracks caused by temperature changes, ultraviolet, ozone, moisture, sewage, heat, cold, etc. It is aimed at providing.

The present invention to achieve the above object is a thermoplastic rubber; menstruum; Polyurethane resins; Acrylic resin; Sodium silicate; Silane coupling agents; Ultraviolet absorbers; And it provides a primer composition comprising a heat stabilizer.

In one embodiment of the present invention, the primer composition is 10 to 40 parts by weight of solvent relative to 100 parts by weight of thermoplastic rubber, 5 to 15 parts by weight of polyurethane resin, 2 to 15 parts by weight of acrylic resin, 1 to 10 parts by weight of sodium silicate Part, characterized in that it comprises 1 to 10 parts by weight of a silane coupling agent, 0.1 to 5 parts by weight of an ultraviolet absorber and 0.1 to 5 parts by weight of a heat stabilizer.

In addition, the present invention is located on the lower surface of the upper structure to support and transfer the load and displacement of the upper structure upper plate; A lower plate positioned on the upper surface of the lower structure to support and transfer loads and displacements of the lower structure; And an elastic rubber positioned between the upper plate and the lower plate and supporting and absorbing the applied load and impact, wherein the elastic rubber is coated with the primer composition. Provide elastic support.

In one embodiment of the present invention, the primer composition is 10 to 40 parts by weight of solvent relative to 100 parts by weight of thermoplastic rubber, 5 to 15 parts by weight of polyurethane resin, 2 to 15 parts by weight of acrylic resin, 1 to 10 parts by weight of sodium silicate Part, characterized in that it comprises 1 to 10 parts by weight of a silane coupling agent, 0.1 to 5 parts by weight of an ultraviolet absorber and 0.1 to 5 parts by weight of a heat stabilizer.

In one embodiment of the present invention, the elastic rubber is coated with the primer composition, a coating layer is formed, and a protective film is adhered to the coating layer.

In one embodiment of the present invention, the protective film is characterized in that it is prepared from a composition comprising a thermoplastic rubber, polyurethane resin, acrylic resin, sodium silicate, calcium carbonate, silane coupling agent, ultraviolet absorber and heat stabilizer.

The present invention provides a coating composition for enhancing the durability of an elastic support having excellent adhesive strength with an elastic rubber and having excellent elasticity, waterproofness, water resistance, weather resistance, ozone resistance, UV protection, abrasion resistance, impact resistance, heat resistance, durability, etc. Can.

In addition, the present invention is a coating layer coated on the surface and side of the elastic rubber; And by including a protective film adhered to the coating layer, the elastic support for the bridge that can be used stably for a long time without aging, breakage, damage and cracks caused by temperature changes, ultraviolet, ozone, moisture, sewage, heat, cold, etc. Can provide.

1 shows an elastic support for a bridge of the present invention.

Hereinafter, the present invention will be described in detail based on examples. The terms, examples, and the like used in the present invention are merely exemplified in order to explain the present invention in more detail and help a person skilled in the art understand, and the scope of the present invention should not be interpreted as being limited thereto.

Technical terms and scientific terms used in the present invention, unless otherwise defined, refer to meanings commonly understood by those skilled in the art to which this invention belongs.

The present invention is a thermoplastic rubber; menstruum; Polyurethane resins; Acrylic resin; Sodium silicate; Silane coupling agents; Ultraviolet absorbers; And it relates to a primer composition comprising a heat stabilizer.

The primer composition is 10 to 40 parts by weight of solvent relative to 100 parts by weight of thermoplastic rubber, 5 to 15 parts by weight of polyurethane resin, 2 to 15 parts by weight of acrylic resin, 1 to 10 parts by weight of sodium silicate, 1 to 10 parts by weight of silane coupling agent Part, 0.1 to 5 parts by weight of the ultraviolet absorber and 0.1 to 5 parts by weight of the heat stabilizer may be included.

The primer composition is coated on the surface and the side of the elastic rubber used for the elastic support of the bridge, aging, breakage, damage, and aging occurring on the surface of the elastic rubber due to temperature change, ultraviolet light, ozone, moisture, sewage, heat, cold, etc. Cracks can be prevented.

In addition, the primer composition may be coated on the surface of the elastic rubber to form a coating layer, and a protective film may be formed on the coating layer. That is, the primer composition may form an adhesive layer on the surface of the elastic rubber so that the protective film is firmly bonded.

The thermoplastic rubber is used to impart elasticity, elasticity, weather resistance and ozone resistance, natural rubber (NR), butadiene rubber (BR), styrene-butadiene rubber (SBR), styrene-butadiene-styrene rubber (SBS), poly One or more may be used from chloroprene rubber (CR), acrylonitrile-butadiene rubber (NBR), isoprene rubber (IR), ethylene-propylene rubber (EPR) and ethylene-propylene-diene rubber (EPDM).

For example, styrene-butadiene rubber (SBR) and styrene-butadiene-styrene rubber (SBS) may be used simultaneously. The weight ratio of styrene-butadiene rubber (SBR) and styrene-butadiene-styrene rubber (SBS) is preferably 60 to 80:20 to 40, and when the weight ratio is less than 60:40, workability deteriorates and exceeds 80:20 In that case, the stretchability and waterproofness of the composition are rather lowered.

The solvent is for adjusting the viscosity of the primer composition, alcohols such as methanol, ethanol, butanol; Ketones such as acetone; Dimethyl sulfoxide; Dimethylformamide; Tetrahydrofuran; toluene; benzene; Xylene; Distilled water and the like can be used without limitation.

The solvent is preferably used in an amount of 10 to 40 parts by weight based on 100 parts by weight of the thermoplastic rubber, and when the content of the thermoplastic rubber is less than 10 parts by weight, processability decreases, and when it exceeds 40 parts by weight, durability and stretchability of the composition decreases.

Polyurethane resins can be used to impart elasticity and water resistance.

Polyurethane resin is preferably used 5 to 15 parts by weight based on 100 parts by weight of the thermoplastic rubber, if the content is less than 5 parts by weight, the effect of addition is negligible, and when it exceeds 15 parts by weight, durability and heat resistance of the composition is rather lowered do.

The acrylic resin is used to impart adhesion and elasticity, and the acrylic resin used includes polymethyl methacrylate, polyethyl methacrylate, polymethyl acrylate, polyethyl acrylate, and acrylic copolymer.

The content of the acrylic resin is preferably 2 to 15 parts by weight with respect to 100 parts by weight of the thermoplastic rubber, and if the content is less than 2 parts by weight, the effect of addition is minimal, and when it exceeds 15 parts by weight, durability and heat resistance are rather reduced.

The sodium silicate is used for imparting flame retardancy, adhesion and fusion, and may be used as a solid phase or a solution.

The content of sodium silicate is preferably 1 to 10 parts by weight with respect to 100 parts by weight of the thermoplastic rubber, and if the content is less than 1 part by weight, adhesiveness and fusion resistance decreases, and when it exceeds 10 parts by weight, durability and water resistance are rather reduced. .

The silane coupling agent has an organic functional group capable of bonding with an organic compound and a hydrolysable group capable of reacting with an inorganic substance, and improves the adhesive strength, waterproofness and durability of the elastic rubber by improving the interfacial adhesion between the elastic rubber and the primer composition. have.

Examples of the silane coupling agent include an alkyl group-containing silane coupling agent, an amino group-containing silane coupling agent, an epoxy group-containing silane coupling agent, an acrylate group-containing silane coupling agent, an isocyanate group-containing silane coupling agent, a mercapto group-containing silane coupling agent, a fluorine-containing silane Coupling agents, vinyl group-containing silane coupling agents, and the like are used.

In one example, the silane coupling agent is preferably a mixture of an acrylate group-containing silane coupling agent and an epoxy group-containing silane coupling agent.

The mixed silane coupling agent is preferably composed of an acrylate group-containing silane coupling agent 60 to 80% by weight and an epoxy group-containing silane coupling agent 20 to 40% by weight.

The content of the silane coupling agent is preferably 1 to 10 parts by weight with respect to 100 parts by weight of the thermoplastic rubber, and if the content is less than 1 part by weight, it is difficult to expect to improve the adhesion, and when it exceeds 10 parts by weight, the use of excess silane coupling agent is rather The interfacial adhesion properties and durability are lowered.

The ultraviolet absorber plays a role of absorbing ultraviolet rays of sunlight to improve heat shielding and light shielding properties, and benzotriazole, hydroxybenzophenone, and hydroxyphenyltriazine may be used without limitation.

The content of the ultraviolet absorber is preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the thermoplastic rubber, and when the content is less than 0.1 parts by weight, the heat shielding property and light-shielding property decrease, and when it exceeds 5 parts by weight, the durability, weather resistance and workability are rather Falls.

The heat stabilizer is used to improve weather resistance, heat resistance, heat insulation and durability, and phenol antioxidant, alkylated monophenol, alkylthiomethylphenol, hydroquinone, alkylated hydroquinone, hydroxybenzyl, triazine, etc. can be used without limitation. have.

The content of the heat stabilizer is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the thermoplastic rubber, and if the content is less than 0.1 parts by weight, weather resistance, heat resistance and durability are lowered, and when it exceeds 5 parts by weight, water resistance, durability and workability are rather Falls.

In addition, the primer composition may further include a polystyrene resin to improve heat resistance and low shrinkage.

The content of polystyrene is preferably 1 to 10 parts by weight based on 100 parts by weight of the thermoplastic rubber, and if the content is less than 1 part by weight, the effect of addition is minimal, and when it exceeds 10 parts by weight, waterproofness and durability are reduced.

The composition may further include a copolymer of an acrylate group-containing silane coupling agent and an acrylic monomer.

The copolymer may improve adhesion of components in the composition, and improve heat resistance and water resistance.

The acrylate group-containing silane coupling agent includes 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, and 3-methacryloxypropyltri Ethoxysilane, 3-acryloxypropyltrimethoxysilane, methacryloxymethyltriethoxysilane, and methacryloxymethyltrimethoxysilane.

The acrylic monomers are methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-amyl acrylate, isoamyl acrylate, n-hexyl acrylate, 2 -Ethylhexyl acrylate, hydroxymethylacrylate, 2-hydroxyethylacrylate, hydroxypropylacrylate, laurylacrylate, methylmethacrylate, ethylmethacrylate, propylmethacrylate, isopropylmethacryl Rate, n-butyl methacrylate, isobutyl methacrylate, n-amyl methacrylate, isoamyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, hydroxymethyl methacrylate, Hydroxypropyl methacrylate, lauryl methacrylate, acrylic acid, methacrylic acid, methyl acrylic acid, ethyl acrylic acid, butyl acrylic acid, 2-ethyl hexyl acrylic acid, decyl acrylic acid, methyl methacrylic acid, ethyl methacrylic acid, butyl methacryl Acids, 2-ethyl hexyl methacrylic acid, decyl methacrylic acid, and the like.

The weight ratio of the acrylate group-containing silane coupling agent and the acrylic monomer is preferably 10 to 30:70 to 90, and the water resistance and durability of the composition may be maximized in the numerical range.

The copolymer of the acrylate group-containing silane coupling agent and the acrylic monomer is used in an amount of 1 to 5 parts by weight based on 100 parts by weight of the thermoplastic rubber, and when the content is less than 1 part by weight, the effect of addition is minimal, and when it exceeds 5 parts by weight The strength decreases.

The composition may further include potassium silicate to impart adhesion and flame retardancy.

The content of potassium silicate is preferably 1 to 5 parts by weight with respect to 100 parts by weight of the thermoplastic rubber, and if the content is less than 1 part by weight, the effect of addition is negligible, and when it exceeds 5 parts by weight, miscibility of the composition decreases and uniform The coating layer cannot be formed.

The composition may further include a polyester polyol. Polyester polyols contain a number of hydroxyl groups in the molecule to improve the bonding strength of the composition, and glycol components such as ethylene glycol, propylene glycol, butanediol, 3-methylpentanediol, hexanediol, bisoxymethylcyclohexane and It can be produced by polymerizing acid components such as dipic acid, terephthalic acid, and isophthalic acid.

It is preferable that the weight average molecular weight of the polyester polyol is 1,000 to 10,000 g/mol. If the weight average molecular weight satisfies the above range, waterproofness and durability may be maximized.

The content of the polyester polyol is preferably 1 to 5 parts by weight based on 100 parts by weight of the thermoplastic rubber, and if the content is less than 1 part by weight, the effect of addition is minimal, and when it exceeds 5 parts by weight, durability and workability are rather lowered.

In addition, the present invention is located on the lower surface of the upper structure to support and transfer the load and displacement of the upper structure upper plate; A lower plate positioned on the upper surface of the lower structure to support and transfer loads and displacements of the lower structure; And an elastic rubber positioned between the upper plate and the lower plate and supporting and absorbing the applied load and impact (FIG. 1).

At this time, the elastic rubber is characterized in that it is coated with the primer composition.

The elastic rubber of the present invention is coated with the coating composition on the surface and side surfaces, and thus can be stably used for a long period of time without aging, breakage, damage, and cracks due to temperature change, ultraviolet light, ozone, moisture, sewage, heat, cold, etc. .

In particular, since the surface of the elastic rubber is cracked, that is, a coating crack does not occur, repair and replacement costs caused by aging, damage and breakage of the elastic rubber can be significantly reduced.

In addition, the elastic rubber is coated with the primer composition to form a coating layer, and a protective film may be adhered to the coating layer.

The primer composition may form an adhesive layer on the surface of the elastic rubber so that the protective film is firmly bonded. That is, the primer composition may act as an adhesive and a primer for bonding the elastic rubber and the protective film.

The protective film is characterized in that it is prepared from a composition comprising a thermoplastic rubber, polyurethane resin, acrylic resin, sodium silicate, calcium carbonate, silane coupling agent, ultraviolet absorber and heat stabilizer.

The protective film may be prepared from the composition through a molding process such as a conventional extrusion process, a calendar process, an injection process, and the like.

The protective film can prevent aging, breakage, damage, and cracks caused by temperature changes, ultraviolet rays, ozone, moisture, sewage, heat, cold, etc., thereby further improving the durability of the elastic bearing.

The composition for the production of a protective film is 5 to 15 parts by weight of polyurethane resin, 2 to 15 parts by weight of acrylic resin, 1 to 10 parts by weight of sodium silicate, 1 to 10 parts by weight of calcium carbonate, and silane relative to 100 parts by weight of thermoplastic rubber It may include 1 to 10 parts by weight of the coupling agent, 0.1 to 5 parts by weight of the ultraviolet absorber and 0.1 to 5 parts by weight of the heat stabilizer.

The thermoplastic rubber is used to impart elasticity, elasticity, weather resistance and ozone resistance, natural rubber (NR), butadiene rubber (BR), styrene-butadiene rubber (SBR), styrene-butadiene-styrene rubber (SBS), poly One or more may be used from chloroprene rubber (CR), acrylonitrile-butadiene rubber (NBR), isoprene rubber (IR), ethylene-propylene rubber (EPR) and ethylene-propylene-diene rubber (EPDM).

For example, styrene-butadiene rubber (SBR) and styrene-butadiene-styrene rubber (SBS) may be used simultaneously. The weight ratio of styrene-butadiene rubber (SBR) and styrene-butadiene-styrene rubber (SBS) is preferably 20 to 40:60 to 80, and when the weight ratio is less than 20:80, workability deteriorates, exceeding 40:60 In that case, the stretchability and waterproofness of the composition are rather lowered.

Polyurethane resins can be used to impart elasticity and water resistance.

Polyurethane resin is preferably used 5 to 15 parts by weight based on 100 parts by weight of the thermoplastic rubber, if the content is less than 5 parts by weight, the effect of addition is negligible, and when it exceeds 15 parts by weight, durability and heat resistance of the composition is rather lowered do.

The acrylic resin is used to impart adhesion and elasticity, and the acrylic resin used includes polymethyl methacrylate, polyethyl methacrylate, polymethyl acrylate, polyethyl acrylate, and acrylic copolymer.

The content of the acrylic resin is preferably 2 to 15 parts by weight with respect to 100 parts by weight of the thermoplastic rubber, and if the content is less than 2 parts by weight, the effect of addition is minimal, and when it exceeds 15 parts by weight, durability and heat resistance are rather reduced.

The sodium silicate is used for imparting flame retardancy, adhesion and fusion, and may be used as a solid phase or a solution.

The content of sodium silicate is preferably 1 to 10 parts by weight with respect to 100 parts by weight of the thermoplastic rubber, and if the content is less than 1 part by weight, adhesiveness and fusion resistance decreases, and when it exceeds 10 parts by weight, durability and water resistance are rather reduced. .

The calcium carbonate is used for imparting adhesion and water resistance, and may be used as a solid phase or a solution.

The content of calcium carbonate is preferably 1 to 10 parts by weight with respect to 100 parts by weight of the thermoplastic rubber, and if the content is less than 1 part by weight, the effect of addition is minimal, and when it exceeds 10 parts by weight, durability is rather reduced.

The silane coupling agent has an organic functional group capable of bonding with an organic compound and a hydrolysable group capable of reacting with an inorganic substance, and improves the adhesive strength, waterproofness and durability of the elastic rubber by improving the interfacial adhesion between the elastic rubber and the primer composition. have.

Examples of the silane coupling agent include an alkyl group-containing silane coupling agent, an amino group-containing silane coupling agent, an epoxy group-containing silane coupling agent, an acrylate group-containing silane coupling agent, an isocyanate group-containing silane coupling agent, a mercapto group-containing silane coupling agent, a fluorine-containing silane Coupling agents, vinyl group-containing silane coupling agents, and the like are used.

In one example, the silane coupling agent is preferably a mixture of an acrylate group-containing silane coupling agent and an epoxy group-containing silane coupling agent.

The mixed silane coupling agent is preferably composed of an acrylate group-containing silane coupling agent 60 to 80% by weight and an epoxy group-containing silane coupling agent 20 to 40% by weight.

The content of the silane coupling agent is preferably 1 to 10 parts by weight with respect to 100 parts by weight of the thermoplastic rubber, and if the content is less than 1 part by weight, it is difficult to expect to improve the adhesion, and when it exceeds 10 parts by weight, the use of excess silane coupling agent is rather The interfacial adhesion properties and durability are lowered.

The ultraviolet absorber plays a role of absorbing ultraviolet rays of sunlight to improve heat shielding and light shielding properties, and benzotriazole, hydroxybenzophenone, and hydroxyphenyltriazine may be used without limitation.

The content of the ultraviolet absorber is preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the thermoplastic rubber, and when the content is less than 0.1 parts by weight, the heat shielding property and light-shielding property decrease, and when it exceeds 5 parts by weight, the durability, weather resistance and workability are rather Falls.

The heat stabilizer is used to improve weather resistance, heat resistance, heat insulation and durability, and phenol antioxidant, alkylated monophenol, alkylthiomethylphenol, hydroquinone, alkylated hydroquinone, hydroxybenzyl, triazine, etc. can be used without limitation. have.

The content of the heat stabilizer is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the thermoplastic rubber, and if the content is less than 0.1 parts by weight, weather resistance, heat resistance and durability are lowered, and when it exceeds 5 parts by weight, water resistance, durability and workability are rather Falls.

In addition, the composition may further include a polystyrene resin to improve heat resistance and low shrinkage.

The content of polystyrene is preferably 1 to 10 parts by weight based on 100 parts by weight of the thermoplastic rubber, and if the content is less than 1 part by weight, the effect of addition is minimal, and when it exceeds 10 parts by weight, waterproofness and durability are reduced.

The composition may further include a copolymer of an acrylate group-containing silane coupling agent and an acrylic monomer.

The copolymer may improve adhesion of components in the composition, and improve heat resistance and water resistance.

The acrylate group-containing silane coupling agent includes 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, and 3-methacryloxypropyltri Ethoxysilane, 3-acryloxypropyltrimethoxysilane, methacryloxymethyltriethoxysilane, and methacryloxymethyltrimethoxysilane.

The acrylic monomers are methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-amyl acrylate, isoamyl acrylate, n-hexyl acrylate, 2 -Ethylhexyl acrylate, hydroxymethylacrylate, 2-hydroxyethylacrylate, hydroxypropylacrylate, laurylacrylate, methylmethacrylate, ethylmethacrylate, propylmethacrylate, isopropylmethacryl Rate, n-butyl methacrylate, isobutyl methacrylate, n-amyl methacrylate, isoamyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, hydroxymethyl methacrylate, Hydroxypropyl methacrylate, lauryl methacrylate, acrylic acid, methacrylic acid, methyl acrylic acid, ethyl acrylic acid, butyl acrylic acid, 2-ethyl hexyl acrylic acid, decyl acrylic acid, methyl methacrylic acid, ethyl methacrylic acid, butyl methacryl Acids, 2-ethyl hexyl methacrylic acid, decyl methacrylic acid, and the like.

The weight ratio of the acrylate group-containing silane coupling agent and the acrylic monomer is preferably 10 to 30:70 to 90, and the water resistance and durability of the composition may be maximized in the numerical range.

The copolymer of the acrylate group-containing silane coupling agent and the acrylic monomer is used in an amount of 1 to 5 parts by weight based on 100 parts by weight of the thermoplastic rubber, and when the content is less than 1 part by weight, the effect of addition is minimal, and when it exceeds 5 parts by weight The strength decreases.

The composition may further include a polyester polyol. Polyester polyols contain a number of hydroxyl groups in the molecule to improve the bonding strength of the composition, and glycol components such as ethylene glycol, propylene glycol, butanediol, 3-methylpentanediol, hexanediol, bisoxymethylcyclohexane and It can be produced by polymerizing acid components such as dipic acid, terephthalic acid, and isophthalic acid.

It is preferable that the weight average molecular weight of the polyester polyol is 1,000 to 10,000 g/mol. If the weight average molecular weight satisfies the above range, waterproofness and durability may be maximized.

The content of the polyester polyol is preferably 1 to 5 parts by weight based on 100 parts by weight of the thermoplastic rubber, and if the content is less than 1 part by weight, the effect of addition is minimal, and when it exceeds 5 parts by weight, durability and workability are rather lowered.

In addition, the protective film may be an asphalt-based protective film prepared from a composition comprising asphalt, solvent, thermoplastic rubber, polyurethane resin, acrylic resin, sodium silicate, calcium carbonate, silane coupling agent, ultraviolet absorber and heat stabilizer.

The asphalt-based protective film may be prepared by impregnating the composition with a nonwoven fabric such as polyester, nylon, and polyurethane.

The composition is 10 to 40 parts by weight of solvent relative to 100 parts by weight of asphalt, 10 to 30 parts by weight of thermoplastic rubber, 5 to 15 parts by weight of polyurethane resin, 2 to 15 parts by weight of acrylic resin, 1 to 10 parts by weight of sodium silicate, carbonic acid It may include 1 to 10 parts by weight of calcium, 1 to 10 parts by weight of a silane coupling agent, 0.1 to 5 parts by weight of an ultraviolet absorber, and 0.1 to 5 parts by weight of a heat stabilizer.

The solvent, thermoplastic rubber, ultraviolet absorber and heat stabilizer are as described above.

Hereinafter, the present invention will be described in detail through examples and comparative examples. The following examples are only exemplified for the practice of the present invention, and the contents of the present invention are not limited by the following examples.

(Example 1)

Styrene-butadiene rubber 100 parts by weight, toluene 25 parts by weight, polyurethane resin 10 parts by weight, acrylic resin 10 parts by weight, sodium silicate 5 parts by weight, 3-methacryloxypropyl trimethoxysilane 70% by weight and 3-glycine A primer composition was prepared by mixing 5 parts by weight of a silane coupling agent mixture composed of 30% by weight of doxypropyl trimethoxysilane, 3 parts by weight of benzotriazole and 3 parts by weight of hydroquinone.

(Example 2)

A primer composition was prepared in the same manner as in Example 1, except that 3 parts by weight of the polyurethane resin was used.

(Example 3)

A primer composition was prepared in the same manner as in Example 1, except that 20 parts by weight of the polyurethane resin was used.

(Example 4)

A primer composition was prepared in the same manner as in Example 1, except that 70 parts by weight of styrene-butadiene rubber and 30 parts by weight of styrene-butadiene-styrene rubber were used instead of 100 parts by weight of styrene-butadiene rubber.

(Example 5)

A primer composition was prepared in the same manner as in Example 1, except that 3 parts by weight of a copolymer of 3-methacryloxypropyl trimethoxysilane and methyl acrylate was additionally used.

(Comparative Example 1)

A primer composition was prepared in the same manner as in Example 1, except that a polyurethane resin was not used.

(Comparative Example 2)

A primer composition was prepared in the same manner as in Example 1, except that no acrylic resin was used.

After forming a coating film from the primer composition prepared from the above Examples and Comparative Examples, the properties were evaluated and the results are shown in Table 1 below.

The dimensional change rate was measured according to KS K ISO 3759.

Water resistance was measured according to KS M ISO 1514. After drying for 72 hours, immersed in water, left for 24 hours, then taken out and dried for 2 hours at room temperature to observe the state of the coating film. At this time, the state of the coating film was marked as excellent, excellent, normal, and poor.

Heat resistance of the coating film was heated for 3 hours in a hot-air circulation type heating furnace maintained at 100°C, and yellowing degree of the coating film was visually observed.

Acid resistance was determined by immersing the coating film in 10% by weight sulfuric acid at room temperature for 5 days, and then observing the state of the coating film.

Adhesion was measured according to JIS K 5600-5-6.

division Example Comparative example One 2 3 4 5 One 2 Dimensional change rate
(%) 2.1 2.8 2.9 1.3 1.2 3.5 3.7 Water resistance Great usually usually eminence eminence Bad Bad Heat resistance Great usually usually eminence eminence Bad Bad Acid resistance eminence usually usually eminence eminence Bad Bad Adhesiveness Great usually usually eminence eminence Bad Bad

From the results of Table 1, the primer compositions of Examples 1 to 5 are excellent in water resistance, heat resistance, acid resistance, adhesiveness, and durability, and are coated on the surfaces and sides of the elastic rubber to effectively prevent aging, breakage, damage, and cracking of the elastic rubber. Can be prevented. In particular, in Examples 4 and 5, it can be seen that the above properties are the best.

On the other hand, it can be seen that the compositions of Comparative Examples 1 and 2 are inferior in water resistance, heat resistance, acid resistance, adhesion, and durability compared to Examples.

(Example 6)

Styrene-butadiene rubber 100 parts by weight, polyurethane resin 10 parts by weight, acrylic resin 10 parts by weight, sodium silicate 5 parts by weight, calcium carbonate 5 parts by weight, 3-methacryloxypropyl trimethoxysilane 70 parts by weight and 3-glycine A composition was prepared by mixing 5 parts by weight of a silane coupling agent mixture composed of 30 parts by weight of hydroxypropyl trimethoxysilane, 3 parts by weight of benzotriazole and 3 parts by weight of hydroquinone.

The composition was extruded through an extruder to prepare a protective film.

The primer composition of Example 1 was applied to a glass surface, and the protective film was adhered onto the coating layer to prepare a coating film in which the primer layer and the protective film were combined.

(Example 7)

When manufacturing the protective film, a coating film was prepared in the same manner as in Example 6, except that 3 parts by weight of the polyurethane resin was used.

(Example 8)

When manufacturing the protective film, a coating film was prepared in the same manner as in Example 6, except that 20 parts by weight of the polyurethane resin was used.

After forming the coating films prepared from Examples 6 to 8, the characteristics were evaluated, and the results are shown in Table 2 below.

division Example One 6 7 8 Dimensional change rate
(%) 2.1 0.8 1.3 1.4 Water resistance Great eminence Great Great Heat resistance Great eminence Great eminence Acid resistance eminence eminence Great Great Adhesiveness Great eminence eminence Great

From the results of Table 2, it can be seen that in Examples 6 to 8, water resistance, heat resistance, acid resistance, adhesion, and durability are improved as the protective film is additionally adhered to the primer layer. Particularly, Example 6 has the best characteristics.

10: lower plate 11: anchor socket
30: elastic rubber 40: upper plate
50: upper plate 51: anchor socket

Claims (6)

Thermoplastic rubber;
menstruum;
Polyurethane resins;
Acrylic resin;
Sodium silicate;
Silane coupling agents;
Ultraviolet absorbers;
Heat stabilizers; And
In the primer composition comprising a polyester polyol,
The primer composition is 10 to 40 parts by weight of solvent relative to 100 parts by weight of thermoplastic rubber, 5 to 15 parts by weight of polyurethane resin, 2 to 15 parts by weight of acrylic resin, 1 to 10 parts by weight of sodium silicate, 1 to 10 parts by weight of silane coupling agent Part, a primer composition comprising 0.1 to 5 parts by weight of an ultraviolet absorber, 0.1 to 5 parts by weight of a heat stabilizer and 1 to 5 parts by weight of a polyester polyol.
delete An upper plate positioned on a lower surface of the upper structure to support and transfer loads and displacements of the upper structure;
A lower plate positioned on the upper surface of the lower structure to support and transmit loads and displacements of the lower structure; And
In the elastic support for the bridge located between the upper plate and the lower plate, including an elastic rubber for supporting and absorbing the applied load and impact,
The elastic rubber is an elastic support for a bridge, characterized in that coated with the primer composition of claim 1.
delete According to claim 3,
The elastic rubber is coated with the primer composition of claim 1 to form a coating layer,
Elastic support for bridges, characterized in that a protective film is adhered to the coating layer.
The method of claim 5,
The protective film is an elastic bearing for a bridge characterized in that it is made from a composition comprising a thermoplastic rubber, polyurethane resin, acrylic resin, sodium silicate, calcium carbonate, silane coupling agent, ultraviolet absorber and heat stabilizer.

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