KR101901656B1 - A coating composition for preventing cracking of elastic bearing for bridge - Google Patents

Abstract

The present invention relates to a coating composition for preventing crack formation on an elastic support. More specifically, the present invention relates to a coating composition for preventing crack formation on an elastic support, containing a solvent, thermoplastic rubber, a phenolic resin, a polystyrene resin, and sodium silicate. According to the present invention, it is possible to provide a coating composition for preventing crack formation on the elastic support, ensuring excellent weather resistance, water resistance, ozone resistance, ultraviolet barrier properties, abrasion resistance, impact resistance, heat resistance, and durability in addition to outstanding adhesion strength with elastic rubber. Further, the coating composition is coated on a surface and a lateral side of elastic rubber without breakage, damage, and crack taking place due to a temperature change, ultraviolet light, and ozone, thereby enabling production of coating composition for preventing crack formation on the elastic support capable of being stably used for a long time.

Description

[0001] The present invention relates to a coating composition for preventing cracking of an elastic base,

The present invention relates to a coating composition for preventing cracking of an elastic support, and more particularly, Thermoplastic rubber; Phenolic resin; Polystyrene resin; And sodium silicate. ≪ RTI ID = 0.0 > [0002] < / RTI >

Generally, bridges are provided with a plurality of piers installed at predetermined distances between the two shifts, an upper structure continuously installed at the upper end of each pier, and a bridge between the piers and the upper structure to absorb the load, impact and deformation of the upper structure. .

Such a bridge support uses elastic rubber between the upper plate and the lower plate in order to efficiently absorb load and impact applied thereto. Since the elastic rubber is used by being exposed to the outside, the side of the bridge is split due to temperature change, ultraviolet rays, ozone, Development, that is, coating cracking phenomenon occurs and can not be used stably for a long period of time.

In the case of coating cracking, the mechanical properties, thermal properties, durability, etc. of the rubber are continuously and rapidly deteriorated and the load, impact and deformation absorption characteristics of the bridge support deteriorate, which can cause serious safety problems of the bridge.

In order to solve such a problem, technology for improving the durability of the elastic rubber has been actively developed.

In this regard, Korean Patent Laid-Open No. 10-2010-0042094 discloses a method of manufacturing a vehicle, comprising: forming a connection groove having a predetermined width and depth by cutting a road pavement layer on a stretched joint; Forming a sealant layer by first curing the road sealant in the connection groove; A step of spraying silica sand on the top surface of the sealant layer followed by compaction at a constant pressure to form a silica sand layer; And a second curing step of curing the sealant layer including the silica sand layer. The present invention also provides a method for constructing a new construction of a bridge or a structure using silica sand.

However, this technique is to recover the damaged area by filling the new material after removing the damaged or damaged area, and the characteristic of the damaged area can be partially compensated. However, when the long term use, the load or impact is concentrated on the damaged area, This can happen again.

Korean Patent Publication No. 10-2010-0042094

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the problems of the prior art, and it is an object of the present invention to provide an anti-crack coating for an anti- It is an object of the present invention to provide a composition.

Another object of the present invention is to provide an anticorrosive coating composition for anticorrosive coating which is coated on the surface and side of an elastic rubber and can be used stably for a long period of time without occurrence of breakage, damage and cracking due to temperature change, ultraviolet rays, ozone and the like.

According to an aspect of the present invention, Thermoplastic rubber; Phenolic resin; Polystyrene resin; And a coating composition for preventing cracking of an elastic support comprising sodium silicate.

In one embodiment of the present invention, the coating composition comprises 10 to 30 parts by weight of a thermoplastic rubber, 1 to 10 parts by weight of a phenol resin, 1 to 10 parts by weight of a polystyrene resin and 1 to 10 parts by weight of sodium silicate, .

In one embodiment of the present invention, the coating composition further comprises 1 to 10 parts by weight of a silane coupling agent per 100 parts by weight of the solvent.

In one embodiment of the present invention, the coating composition further comprises 1 to 5 parts by weight of a copolymer of an acrylate group-containing silane coupling agent and an acrylic monomer.

According to another aspect of the present invention, there is provided an upper structure, comprising: an upper plate positioned on a lower surface of an upper structure to support and transmit 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 an elastic rubber disposed between the upper plate and the lower plate for supporting and absorbing the applied load and impact, characterized in that the elastic rubber is coated with the coating composition Thereby providing an elastic support.

The present invention can provide an anticorrosive coating composition excellent in adhesion strength to an elastic rubber and excellent in weather resistance, water resistance, ozone resistance, ultraviolet barrier property, abrasion resistance, impact resistance, heat resistance and durability.

Also, the present invention can provide a coating composition for anti-cracking of an elastic support which is coated on the surface and side of the elastic rubber and can be used stably for a long period of time without breakage, damage and cracking due to temperature change, ultraviolet rays, ozone and the like.

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

Hereinafter, the present invention will be described in detail based on examples. It is to be understood that the terminology, examples and the like used in the present invention are merely illustrative of the present invention in order to more clearly explain the present invention and to facilitate understanding of the ordinary artisan, and should not be construed as being limited thereto.

Technical terms and scientific terms used in the present invention mean what the person skilled in the art would normally understand unless otherwise defined.

The present invention relates to a process for the preparation of Thermoplastic rubber; Phenolic resin; Polystyrene resin; And sodium silicate. ≪ RTI ID = 0.0 > [0002] < / RTI >

The coating composition may contain 10 to 30 parts by weight of a thermoplastic rubber, 1 to 10 parts by weight of a phenol resin, 1 to 10 parts by weight of a polystyrene resin, and 1 to 10 parts by weight of sodium silicate, based on 100 parts by weight of the solvent.

The coating composition is coated on the surface and side of the elastic rubber used for the elastic support of the bridge, and can prevent breakage, damage, and cracking on the surface of the elastic rubber by temperature change, ultraviolet rays, ozone or the like.

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

The thermoplastic rubber is used for imparting elasticity, weather resistance and ozone resistance, and can be used without limitation, such as styrene thermoplastic rubber, olefin thermoplastic rubber, urethane thermoplastic rubber, amide thermoplastic rubber, ester thermoplastic rubber and silicone thermoplastic rubber have.

In particular, thermoplastic rubbers such as polyurethane, natural rubber and SBR (styrene-butadiene rubber) are preferably used.

The thermoplastic rubber is preferably used in an amount of 10 to 30 parts by weight based on 100 parts by weight of the solvent. When the content of the thermoplastic rubber is less than 10 parts by weight, the effect of addition is insignificant. When the content of the thermoplastic rubber exceeds 30 parts by weight, .

The phenol resin is used for imparting heat resistance, flame retardancy and weather resistance, and novolak type phenol resin and resole type phenol resin can be used.

The phenol resin is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the solvent. When the content of the phenol resin is less than 1 part by weight, the effect of addition is insignificant. When the amount is more than 10 parts by weight, But rather degraded.

The polystyrene resin is used for improvement of heat resistance and low shrinkage, and known polymers and copolymers can be used without limitation.

The content of polystyrene is preferably 1 to 10 parts by weight based on 100 parts by weight of the solvent. When the content is less than 1 part by weight, the effect of addition is insignificant. When it exceeds 10 parts by weight, the impact resistance is decreased.

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

The content of sodium silicate is preferably 1 to 10 parts by weight with respect to 100 parts by weight of the solvent. When the content is less than 1 part by weight, the adhesiveness and weldability are deteriorated. When the content is more than 10 parts by weight, heat resistance and workability are lowered.

The coating composition of the present invention may further comprise 1 to 10 parts by weight of a silane coupling agent per 100 parts by weight of the solvent.

The silane coupling agent has an organic functional group capable of binding with an organic compound and a hydrolyzable group capable of reacting with an inorganic substance and can improve the interfacial adhesion between the elastic rubber and the coating composition to increase the adhesiveness, flame retardancy and durability of the elastic rubber have.

As the silane coupling agent, 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- A coupling agent, and a vinyl group-containing silane coupling agent.

In particular, 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 60 to 90% by weight of an acrylate group-containing silane coupling agent and 10 to 40% by weight of an epoxy group-containing silane coupling agent.

The content of the silane coupling agent is preferably 1 to 10 parts by weight based on 100 parts by weight of the solvent. When the content is less than 1 part by weight, it is difficult to expect an improvement in adhesion. When the amount exceeds 10 parts by weight, Adhesion property and durability are lowered.

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

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

Examples of the acrylate group-containing silane coupling agent include 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltri Acryloxypropyltrimethoxysilane, methacryloxymethyltriethoxysilane, methacryloxymethyltrimethoxysilane, and the like.

The acrylic monomer may be at least one selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-amyl acrylate, isoamyl acrylate, Acrylates such as methyl acrylate, ethyl acrylate, ethylhexyl acrylate, hydroxymethyl acrylate, 2-hydroxyethyl acrylate, hydroxypropyl acrylate, lauryl acrylate, methyl methacrylate, ethyl methacrylate, 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 acrylate, ethyl acrylate, butyl Acrylic acid, 2-ethylhexyl acrylate, decyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, decyl methacrylate 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 abrasion resistance, water resistance, heat resistance, and the like of the composition can be maximized within the above 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 solvent. When the content is less than 1 part by weight, the effect of addition is insignificant. .

The coating composition may further comprise calcium silicate to impart adhesion and flame retardancy.

The content of potassium silicate is preferably 1 to 5 parts by weight based on 100 parts by weight of the solvent. When the content is less than 1 part by weight, the effect of addition is insignificant. When the content is more than 5 parts by weight, Can not be formed.

The coating composition may further include grafted polyethylene grafted with acrylic acid, methacrylic acid, maleic acid, maleic anhydride or the like, and the grafted polyethylene may improve stretchability and durability.

The amount of the grafted polyethylene is preferably 1 to 5 parts by weight based on 100 parts by weight of the solvent. When the amount is less than 1 part by weight, the effect of addition is insignificant. When the amount is more than 5 parts by weight, the heat resistance is lowered.

The coating composition may further comprise an antiwear agent to improve wear resistance.

As the wear resistant agent, a fatty acid ester of sorbitan is used, and sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, and the like can be used.

The content of the wear-resistant agent is preferably 1 to 5 parts by weight with respect to 100 parts by weight of the solvent. When the content is less than 1 part by weight, the effect of addition is insignificant. When the content is more than 5 parts by weight, .

The wear-resistant agent may further comprise a fatty acid ester of polyoxyethylene sorbitan.

 Fatty acid esters of polyoxyethylene sorbitan can be used without limitation, such as polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, and the like have.

When a fatty acid ester of sorbitan and a fatty acid ester of polyoxyethylene sorbitan are simultaneously used as a wear resistance agent, the weight ratio of fatty acid ester of sorbitan and fatty acid ester of polyoxyethylene sorbitan is preferably 60 to 80:20 to 40 . When the above range is satisfied, abrasion resistance and water resistance of the composition can be maximized.

The present invention also provides an upper plate (40) positioned on the lower surface of the upper structure for supporting and transmitting loads and displacements of the upper structure; A lower plate (10) located on the upper surface of the lower structure to support and transmit loads and displacements of the lower structure; And an elastic rubber (30) positioned between the upper plate and the lower plate and supporting and absorbing the applied load and impact, wherein the elastic rubber (30) is coated with the coating composition (Fig. 1). Fig.

The elastic rubber of the present invention can be stably used for a long period of time because the coating composition is coated on the front and side surfaces, and is not damaged, damaged or cracked due to temperature change, ultraviolet rays, ozone or the like.

Particularly, the side of the elastic rubber is not cracked, that is, the coating cracking phenomenon does not occur, and the maintenance and replacement cost caused by the damage and breakage of the elastic rubber can be drastically reduced.

The coating composition of the present invention is excellent in adhesion strength with the elastic rubber (30) and excellent in weatherability, water resistance, ozone resistance, ultraviolet barrier property, abrasion resistance, impact resistance, heat resistance and durability so that the load, It can be effectively absorbed.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. The following examples are intended to illustrate the practice of the present invention and are not intended to limit the scope of the present invention.

(Example 1)

100 parts by weight of toluene, 20 parts by weight of styrene-butadiene rubber, 5 parts by weight of phenol resin, 5 parts by weight of polystyrene resin and 5 parts by weight of sodium silicate were mixed to prepare a coating composition.

(Example 2)

A coating composition was prepared in the same manner as in Example 1 except that 0.5 part by weight of sodium silicate was used.

(Example 3)

A coating composition was prepared in the same manner as in Example 1, except that 15 parts by weight of sodium silicate was used.

(Example 4)

Except that 5 parts by weight of a silane coupling agent mixture composed of 80% by weight of 3-methacryloxypropyltrimethoxysilane and 20% by weight of 3-glycidoxypropyltrimethoxysilane was additionally used in the same manner as in Example 1 To prepare a coating composition.

(Example 5)

A coating composition was prepared in the same manner as in Example 4, except that 3 parts by weight of a copolymer of 3-methacryloxypropyltrimethoxysilane and methyl acrylate was additionally used.

(Example 6)

A coating composition was prepared in the same manner as in Example 5, except that 3 parts by weight of grafted polyethylene grafted with acrylic acid was further used.

(Example 7)

A coating composition was prepared in the same manner as in Example 6 except that 2 parts by weight of sorbitan monolaurate and 1 part by weight of polyoxyethylene sorbitan monolaurate were additionally used.

(Comparative Example 1)

A coating composition was prepared in the same manner as in Example 1, except that sodium silicate was not used.

(Comparative Example 2)

A coating composition was prepared in the same manner as in Example 1, except that the polystyrene resin was not used.

After forming a coating film from the coating compositions 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 in accordance with KS K ISO 3759.

The water resistance was measured in accordance with KS M ISO 1514. After drying for 72 hours, it was immersed in water, left for 24 hours, removed, and dried at room temperature for 2 hours. At this time, the state of the coating film was marked as excellent, excellent, normal, and bad.

The coating film was heated for 3 hours in a hot air circulating heating furnace maintained at 100 캜 for heat resistance, and then the yellowing degree of the coating film was visually observed.

The acid resistance was evaluated by observing the condition of the coating film after immersing the coating film in 10 wt% sulfuric acid at room temperature for 5 days.

The adhesiveness was measured according to JIS K 5600-5-6.

division Example Comparative Example One 2 3 4 5 6 7 One 2 Dimensional change rate
(%) 1.8 2.4 2.3 1.2 1.1 1.0 1.1 3.1 3.3 Water resistance Great usually usually eminence eminence eminence eminence Bad Bad Heat resistance Great usually usually Great Great eminence eminence Bad Bad Acid resistance Great usually usually Great Great eminence eminence Bad Bad Adhesiveness Great usually usually Great eminence eminence eminence Bad Bad

From the results shown in Table 1, it can be seen that the coating compositions of Examples 1 to 7 are excellent in water resistance, heat resistance, acid resistance, adhesiveness and durability and are coated on the surface and side surfaces of the elastic rubber to effectively prevent breakage, .

On the other hand, the coating compositions of Comparative Examples 1 and 2 are inferior in water resistance, heat resistance, acid resistance, adhesiveness and durability to those of the Examples.

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

Claims (5)

menstruum;
Thermoplastic rubber;
Phenolic resin;
Polystyrene resin;
Sodium silicate;
Silane coupling agents; And
A coating composition for anti-cracking of an elastic support comprising a fatty acid ester of sorbitan,
Wherein the coating composition comprises 10 to 30 parts by weight of a thermoplastic rubber, 1 to 10 parts by weight of a phenol resin, 1 to 10 parts by weight of a polystyrene resin, 1 to 10 parts by weight of sodium silicate, 1 to 10 parts by weight of a silane coupling agent, And 1 to 5 parts by weight of a fatty acid ester of sorbitan.
delete delete The method according to claim 1,
Wherein the coating composition further comprises a copolymer of an acrylate group-containing silane coupling agent and an acrylic monomer.
An upper plate positioned on a lower surface of the upper structure to support and transmit 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
And an elastic rubber disposed between the upper plate and the lower plate for supporting and absorbing an applied load and an impact,
Characterized in that the elastic rubber is coated with the coating composition of claim 1.

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