KR102026987B1 - Coating composition for waterproof construction of roof - Google Patents

Abstract

The present invention relates to a coating composition for rooftop waterproofing construction, which comprises: an acrylic monomer; a modified benzoic acid ester compound; a filler; a dispersant; a curing agent; and a solvent, wherein the modified benzoic acid ester compound is obtained by polymerizing a fluorocarbon monomer having repeating units of fluorocarbon represented by -CF_2CF_2- of 10 to 20 and a benzoic acid ester compound.

Description

Topcoat composition for rooftop waterproofing construction. {COATING COMPOSITION FOR WATERPROOF CONSTRUCTION OF ROOF}

The present invention relates to a roof coating composition for waterproofing roofing, and more particularly, to a roof coating waterproofing composition capable of forming a top coating film suitable for coating work during rooftop waterproofing and having excellent life and heat shielding properties. will be.

When waterproofing on the roof of a building, the coating film is generally applied to the roof surface in the order of undercoat, midway, and top coat, and is applied by applying a composition suitable for each coating film. Among them, the top coat is a coating film directly exposed to the atmosphere and direct sunlight, and after 4 to 5 years of construction, the top coat is damaged by deterioration.

In general, the top coat is applied to a composition for providing a heat shielding effect to improve the cooling effect of the building. For example, Korean Patent Publication No. 10-1625115 discloses a 50-70 wt% room temperature-curable silicone rubber stock solution, 10-15 wt% polyurethane resin, 0.1-5 wt% dichlorodimethylsilane as a top insulation heat shield And the remainder is using a mixture containing a solvent toluene, thereby achieving a heat shielding and waterproofing effect.

In addition, the Republic of Korea Patent Publication No. 10-1169183, polymethyl methacrylate resin 20 ~ 40 wt%, polyol 1 ~ 10 wt%, plasticizer 1 ~ 15 wt%, calcium carbonate 10 ~ 20 wt%, heat shield pigment 10 ~ 20 wt%, metallic inorganic pigment for heat dissipation 1-5 wt%, hollow pigment 10-20 wt%, dispersant 0.2-2 wt%, color separation inhibitor 0.2-2 wt%, defoamer 0.2-2 wt%, leveling agent 0.2- 1 to 3 wt% of the composition to provide thermal insulation and 70 to 85 wt% of polyol, 0.1 to 1 wt% of 1,3-butylene glycol, 14 to 24 wt% of isocyanate, 0.5 to 6 wt% of xylene A second composition to promote adhesion; And a heat shielding topcoat composition containing benzoyl peroxide as a curing agent to improve heat shielding and waterproofing properties.

However, when the composition disclosed in these prior arts is applied to the top, the heat shielding and waterproofing properties at the time of construction can be sufficiently secured, but the physical properties such as heat shielding and waterproofing are deteriorated with time. As the deterioration of physical properties is shown to be large, there is a need for improvement.

Republic of Korea Patent Publication No. 10-1625115 Republic of Korea Patent Registration No. 10-1169183

The present invention has been made in order to solve the problems of the prior art as described above, the object of the present invention is to provide a top coat composition used in forming a top coat film during roof-top waterproof construction and improved adhesion, heat shielding and waterproof performance.

Moreover, it aims at providing the composition for top coats which can maintain a physical property until recomposition of a top coat by reducing the physical property fall rate of a top coat film.

The roof coating composition for waterproofing rooftop of the present invention for solving the above problems is a composition for roof coating for waterproofing rooftop including acrylic monomer, modified benzoic acid ester compound, filler, dispersant, curing agent and solvent, the modified benzoic acid ester The compound is obtained by polymerizing a fluorocarbon monomer and a benzoic acid ester compound having 2 to 5 repeating units of fluorocarbon represented by -CF ₂ CF _2- .

In this case, the modified benzoic acid ester compound may be contained 20 to 40 parts by weight based on 100 parts by weight of the acrylic monomer.

In addition, the filler may be a mixture of silica particles and titanium dioxide particles modified with urea and aldehyde groups.

Applying the top coat composition for waterproofing rooftop according to the present invention is used to form a topcoat film during rooftop waterproofing, and shows the effect of improving adhesion, heat shielding and waterproofing performance.

Moreover, the effect of maintaining physical properties until reconstruction of a top coat is exhibited by reducing the physical property fall rate of a top coat film.

1 is a cross-sectional view of a waterproof coating film for applying the roof coating composition for waterproofing construction according to the present invention.

Hereinafter, the present invention will be described in more detail. The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

The roof coating composition for waterproofing the rooftop of the present invention is characterized by including an acrylic monomer, a modified benzoic acid ester compound, a filler, a pigment, a dispersant, a curing agent and a solvent.

Through the roof waterproof construction, the coating film as shown in FIG. 1 is laminated, and a top coat is installed on the top of the rooftop, and a midway and top coat are installed thereon.

The undercoat is installed to firmly adhere to the concrete, which is actually the waterproof role and the rooftop floor, and uses a urethane-based composition. In addition, the midway is a coating film that acts as a substantially waterproof to form a coating film by applying a urethane-based intermediate composition to form a thickest coating film. In addition, the top coat is applied to protect the intermediate coating film and to improve the waterproofing effect. When using an acrylic composition or a urethane-based composition, which is a typical top coat composition, the top coat is rebuilt only after 4 to 5 years to maintain roof waterproofing. .

Therefore, once the top coat is constructed, it is necessary to maintain its properties for a long time. In case of the rooftop, it may be damaged by rain, temperature change, impact, etc., which leads to a weakening of waterproof performance.

The composition of the present invention optimizes its configuration to have suitable physical properties for such top coat construction.

The acrylic monomer constituting the composition is a component constituting the acrylic binder for forming the top coat, and generally forms a binder composition by mixing one or more acrylic compounds. Examples of the acrylic monomers include ethyl acrylate, 2-ethylhexyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, and the like. It is preferable to use a mixture of monomers in which the monomers are mixed in an appropriate ratio. desirable. In addition, each acrylic monomer may be blended in the range of 2 to 10 parts by weight, the blending ratio of the acrylic monomer may be appropriately changed according to the waterproof construction conditions, the acrylic monomer is contained in the composition to act as an acrylic binder do.

In the present invention, a modified benzoic acid ester compound is used in addition to the acrylic monomer, and a benzoic acid ester compound modified with carbon fluoride is applied. The benzoic acid ester compound may include trimethylolpropaneacrylic acid benzoic acid ester, trimethylolpropanebenzoic acid ester, p-dimethylaminobenzoic acid ethyl ester, p-dimethylaminobenzoic acid butoxyethyl ester, and the like. It has been shown to improve compatibility and waterproof performance.

The modified benzoic acid ester compound is modified with a fluorocarbon monomer having 2 to 5 repeating units of fluorocarbon represented by -CF ₂ CF _2- , and the monomer having a repeating unit of fluorocarbon is polytetrafluoroethylene by polymerization. It can form. The polytetrafluoroethylene is excellent in properties such as heat resistance, chemical resistance, water repellency, such that the fluorocarbon group is bonded to the benzoic acid ester compound to produce the modified benzoic acid ester compound through a reaction as in Scheme 1 below. In this case, n in Scheme 1 is 2 to 5.

Scheme 1

The modified benzoic acid ester compound prepared as described above was excellent in water repellency including a fluorocarbon group, and in particular, was significantly lowered in the physical property deterioration rate of the top coat when combined with an acrylic monomer to form a top coat composition.

In addition, when the repeating unit of the fluorocarbon monomer is 2 to 5, it was found that the characteristics of the top coat film is improved, if the length of the fluorocarbon monomer is too long, the molecular size is too large, the dispersion and compatibility in the composition is lowered As a result, the effect of improving the physical properties of the top coat was found to be inferior.

In the present invention, the filler is used by mixing silica particles and titanium dioxide particles modified with urea and aldehyde groups. The titanium dioxide is used as a white pigment and is also used as a heat shielding material due to its high thermal conductivity. Although used as a filler in the present invention, by using in combination with the urea and aldehyde-modified silica particles, it is possible to suppress the lowering of physical properties of the top coat film and to improve the durability and waterproof performance of the coating film. The titanium dioxide particles are preferably used particles having a particle size of 0.5 to 2㎛, if the particle size is too small, the workability is inferior, if too large it is difficult to form a uniform coating film during the coating film use the particles of the size It is desirable to.

In addition, instead of the silica particles generally used as the filler, silica particles modified with urea and aldehyde groups are used, thereby giving an adhesive property to the silica particles, thereby improving durability after forming a top coat.

The modification of the silica particles is performed by reacting silica particles modified with an allyl group and dichloromethane under ozone to form an aldehyde group on the surface of the silica particles, as shown in Scheme 2 below, and reacting the aldehyde group with urea to the surface of the urea. The silica particles modified with groups are obtained.

Scheme 2

(1)

(One)

(2)

(2)

The urea and aldehyde-modified silica particles and titanium dioxide particles are preferably mixed in a weight ratio of 1: 1 to 3: 1. When the content of the silica particles is too small, sufficient adhesion performance cannot be obtained and the durability of the coating film is improved. It was found that the effect is small, and too much, the content of titanium dioxide particles is relatively small, there is a problem in the waterproof effect or color implementation.

In addition, the roof coating composition for waterproofing construction of the present invention includes a dispersant, a curing agent, and a solvent, and may further include additives such as pigments, antifoaming agents, leveling agents, viscosity adjusting agents, plasticizers, and waxes as necessary.

The dispersing agent may be added to prevent the precipitation of components having a high specific gravity such as fillers and pigments during the storage period of the composition may be used cationic, anionic surfactants or neutral surfactants. Since the composition of the present invention does not contain an ionic component, it is preferable to use a neutral surfactant. It is preferable to use a block copolymer having a hydrophilic group and a hydrophobic group as the neutral surfactant, and the neutral surfactant can form a bond with the water-soluble acrylic molecule, thereby improving the dispersibility as well as the water resistance and adhesion of the acrylic binder. The effect of the improvement of may be achieved.

The block copolymer was found to have a content of more than 50 mol% of the hydrophilic portion, it has been shown that having a sufficient length of the hydrophilic group can improve the physical properties of the coating film by bonding with acrylic molecules. Such block copolymers include PEG-based surfactants (containing polyoxyethylene as a hydrophilic group), BRIJ-based surfactants (containing polyethylene glycol as a hydrophilic group), IGEPAL-based surfactants (containing polyoxyethylene as a hydrophilic group), and Pluronic surfactants ( Polyoxyethylene-containing hydrophilic group) and TWEEN-based surfactants (polyethylene glycol, polyoxyethylene-containing hydrophilic group), and the like, and specifically, PEG 60, BRIJ O 20, BRIJ 58, BRIJ S 100, BRIJ. S 20, IGEPAL CO-720, IGEPAL CO-890, Pluronic L-35, Pluronic L-64, Pluronic 10R5, TWEEN 40, TWEEN 60, etc. are mentioned.

Examples of the curing agent include tertiarybutylcyclohexyl peroxydicarbonate, benzoyl peroxide, dicumyl peroxide, butylhydro peroxide, cumylhydroperoxide, t-butylperoxy maleic acid and t-butylhydroperoxide used as radical initiators. , Acetyl peroxide, lauroyl peroxide, azobisisobutyronitrile and azobisdimethylvaleronitrile can be used. By adding the curing agent, crosslinking of monomers by radical initiation reaction can be formed after the top coat, and thus curing speed and density can be increased, thereby improving waterproofing performance and durability of the coating film.

In addition, the solvent is added to adjust the viscosity of the composition may be used organic solvents such as methyl ethyl ketone, toluene, xylene.

Therefore, the composition for top coat of the present invention is 20 to 40 parts by weight of the modified benzoic acid ester compound, 50 to 100 parts by weight of the filler, 1 to 5 parts by weight of the dispersant, 1 to 5 parts by weight of the curing agent, and 1 to 5 parts by weight of the acrylic monomer. It can be formed by mixing 10 parts by weight.

In addition, the pigment that can be added may be added to improve the heat shielding and at the same time to give a color to the coating film, zinc oxide, indium oxide, tin oxide, antimony can be added together with the titanium dioxide particles Ceramic particles such as tin oxide, indium tin oxide, molybdenum oxide, tantalum oxide, vanadium pentoxide, niobium oxide, boron nitride and aluminum oxide can be used. In addition, it is also possible to use a hollow glass bubble that can block the conduction of thermal energy.

Therefore, in order to confirm that the physical properties when the composition for the roof coating composition for roof construction according to the present invention is stably maintained, samples were prepared and tested as follows.

As an acryl monomer, the mixture of the monomer which mixed 2 weight part of ethyl acrylate, 5 weight part of 2-ethylhexyl acrylate, 2 weight part of butyl acrylate, and 2 weight part of methyl methacrylate was used.

The modified benzoic acid ester compound is prepared by mixing 5 parts by weight of a fluorocarbon monomer having 5 repeating units of fluorocarbon, 1 part by weight of trimethylolpropaneacrylic acid benzoic acid ester, 0.5 part by weight of initiator, 0.1 part by weight of surfactant, and 80 parts by weight of hexane. It was.

The filler was used by mixing 8 parts by weight of titanium dioxide particles having an average particle size of 1 μm and 10 parts by weight of silica particles modified with urea and aldehyde groups. In this case, the silica particles were modified by mixing allyl group-modified silica particles (silicone company) and dichloromethane in a weight ratio of 1: 5, mixed at 0 ° C and reacted while bubbling ozone gas to obtain silica particles modified with aldehyde groups. . The aldehyde group-modified silica particles and urea were combined and reacted in a molar ratio of 1: 0.1, and the unreacted urea was removed to prepare silica particles modified with urea and aldehyde groups.

As a dispersant, a surfactant solution obtained by dissolving 20% by weight of Pluronic P-123 in remainder of ethanol was used, benzoyl peroxide was used as a curing agent, and methyl ethyl ketone was used as a solvent.

100 parts by weight of the acrylic monomer, 30 parts by weight of modified benzoic acid ester compound, 80 parts by weight of filler, 2 parts by weight of dispersant, 3 parts by weight of hardener, and 5 parts by weight of solvent were mixed to prepare a composition for coating.

In addition, a topcoat composition was prepared in the same manner as in Example 1, but a modified benzoic acid ester compound was prepared using a fluorocarbon monomer having two repeating units (Example 2).

In addition, a topcoat composition was prepared in the same manner as in Example 1, but a modified benzoic acid ester compound was prepared using a fluorocarbon monomer having 10 repeating units (Comparative Example 1).

In addition, a topcoat composition was prepared in the same manner as in Example 1, but a topcoat composition containing 20 parts by weight of a bifunctional polyether polyol having a molecular weight of 1,600 was prepared without using a modified benzoic acid ester compound (Comparative Example 2).

In addition, a coating composition was prepared in the same manner as in Example 1, but 20 parts by weight of titanium dioxide and 5 parts by weight of calcium carbonate were mixed and used as a filler (Comparative Example 3).

In order to measure the water resistance, alkali resistance, solvent resistance, and adhesion, the specimens were prepared and the coating was evaluated by the following method.

The composition is coated on a glass plate (60 × 140 × 5㎜) with a film applicator to have a dry coating thickness of about 50 μm, then naturally dried at room temperature for 7 days, and immersed in distilled water for 168 hours, and then there is an abnormality in the coating film. Was visually evaluated to evaluate the water resistance.

In addition, the composition was coated on a glass plate (60 × 140 × 5 mm) with a film applicator to have a dry coating thickness of about 50 μm, then naturally dried at room temperature for 7 days, and then immersed in a 5% aqueous sodium hydroxide solution for 168 hours. Then, the alkali resistance was evaluated by visual inspection of the abnormality of a coating film.

In addition, the composition was coated on a glass plate (60 × 140 × 5 mm) with a film applicator to have a dry coating thickness of about 50 μm, then naturally dried at room temperature for 7 days, and then deposited in xylene for 168 hours, and then the coating film. The solvent resistance was measured by visual inspection for abnormalities.

In addition, according to the test method of Test Method B of ASTM D3359, the dried coating film was scraped with 6 pieces at intervals of 2 cm with each other and made 25 cells, and then bonded to the area with 3M transparent tape. According to the evaluation of adhesion in 6 steps, there was no film peeling at all (5), film peeling less than 5% (4), film peeling 5 to 15% (3), film peeling 16 to 35% (2), film peeling It evaluated by 36-65% (1) and coating film peeling 66% or more (0).

As a result, it was confirmed that the specimens prepared using the compositions of Examples 1 and 2 and Comparative Examples 1 to 3 had good water resistance, alkali resistance, and solvent resistance, and had excellent adhesion at 5 points.

In addition, five sheets of concrete panels having a thickness of 1 cm and a width of 0.4 m 2 were prepared, and the surface of the concrete panel was used as a commercial product of KCC's spartan as a waterproofing material for undercoat and intermediate. The undercoat was coated in an amount of 0.15 L / m 2 and the intermediate coating was 4.2 L / m 2 to form the undercoat and the median. The coating composition according to Examples and Comparative Examples was applied to the surface of the intermediate coating film in an amount of 0.1 l / m 2, respectively, and naturally dried at room temperature for 7 days to form a coating film corresponding to the waterproof construction.

An infrared lamp was installed at the height of 30 cm of the upper panel of the five concrete panels, and the temperature of the upper and lower surfaces of the panel was measured over time, and the temperature difference (ΔT) between the upper and lower panels was obtained. In addition, after the measurement, the concrete panel was placed in an oven at 80 ± 2 ° C. for 100, 500, and 1,000 hours, and then taken out, and the temperature was measured in the same manner to evaluate whether the heat shielding effect was lowered.

In addition, the adhesion strength was measured in accordance with KS F 4929 for five concrete panels provided with the upper, middle, and top coats, and were exposed for 500 hours and 1,000 hours at a temperature of 50 ± 2 ° C. and a humidity of 70 ± 2% RH. After that, the adhesion strength of the top coat was measured.

This test is an accelerated test to evaluate the degree of deterioration of physical properties when exposed to high temperature and high temperature and high humidity conditions for a long time. In addition, a commercially available waterproofing material was used as the lower and middle, which is intended to evaluate the compatibility with commercially available products.

The results are shown in Table 1. In Table 1, the bond strength is the strength at the fracture of the matrix.

Temperature difference between upper and lower part (ΔT) Adhesion Strength (㎏f / ㎠) 0 hours 100 hours 500 hours 1000 hours 0 hours 500 hours 1000 hours Example 1 6.5 6.6 6.8 7.2 38.7 37.8 34.5 Example 2 6.4 6.6 6.9 7.4 36.8 35.2 33.7 Comparative Example 1 6.2 6.6 7.3 13.7 37.2 33.5 26.2 Comparative Example 2 7.4 9.6 15.5 20.8 38.2 28.6 12.5 Comparative Example 3 6.5 10.5 18.2 28.0 37.5 30.3 18.9

Looking at the results of Table 1, in the case of Examples 1 and 2, the temperature difference between the top and bottom of the panel does not change significantly until 1,000 hours have elapsed, so that the thermal insulation performance can be stably maintained even when exposed to heat for a long time. In addition, the adhesion strength does not appear to decrease significantly until the elapse of 1,000 hours, it was shown that the waterproof performance can be maintained for a long time.

On the other hand, in the case of Comparative Examples 1 to 3, the temperature difference between the upper and lower panels after 500 hours and after 1,000 hours has changed significantly, and the adhesive strength is also rapidly deteriorated after 1,000 hours. It was found to be worse.

Therefore, when the rooftop waterproofing construction using the topcoat composition of the present invention, since the topcoat maintains stable properties until the next replacement, the waterproofing and heat shielding performance is drastically lowered, which is improved compared to the conventional waterproofing materials which caused problems before replacement. Effect.

As described above, the present invention has been described with reference to preferred embodiments, but various modifications and changes are possible by those skilled in the art without departing from the spirit of the present invention and without departing from the spirit of the present invention. The examples are to be regarded as falling within the scope of the invention and the appended claims.

Claims (3)

As a composition for top coat for rooftop waterproofing which consists of 100 weight part of acrylic monomers, 30 weight part of modified benzoic acid ester compounds, 80 weight part of fillers, 2 weight part of dispersing agents, 3 weight part of hardening | curing agents, and 5 weight part of solvents,
The modified benzoic acid ester compound is 5 parts by weight of a fluorocarbon monomer having 5 repeating units of fluorocarbon represented by -CF ₂ CF _2- , 1 part by weight of trimethylolpropaneacrylic acid benzoic acid ester, 0.5 part by weight of an initiator, and 0.1 part by weight of a surfactant. , Is prepared by mixing 80 parts by weight of hexane,
The filler is a roof coating composition for waterproofing roofing, characterized in that a mixture of 8 parts by weight of titanium dioxide particles having an average particle size of 1 ㎛ and 10 parts by weight of silica particles modified with urea and aldehyde groups.
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