KR100445811B1 - Waterproofing primer composition - Google Patents

Abstract

The present invention relates to a spray type waterproofing agent composition and a waterproof primer composition, and more specifically, it is possible to apply spray coating and hardening at room temperature to form a coating film having high flexibility and tensile strength, which can be used in steel bridges or concrete bridges with a lot of traffic. To prepare a waterproofing agent composition consisting of a component containing a (meth) acrylic monomer and a polyurethane (meth) acrylate, and to a component containing a methacryl monomer and an epoxy resin so that the waterproof coating layer can be completely bonded to the base of the base A spray type waterproofing agent composition and a waterproofing primer composition for preparing a primer composition, which is used for waterproof construction, to improve the waterproofing effect, convenience of construction, extension of the life of the waterproofing coating, and prevention of dew condensation and whitening. will be.

Description

Waterproofing primer composition

The present invention relates to a spray type waterproofing agent composition and a waterproof primer composition, and more specifically, it is possible to apply spray coating and hardening at room temperature to form a coating film having high flexibility and tensile strength, which can be used in steel bridges or concrete bridges with a lot of traffic. To prepare a waterproofing agent composition consisting of a component containing a (meth) acrylic monomer and a polyurethane (meth) acrylate, and to a component containing a methacryl monomer and an epoxy resin so that the waterproof coating layer can be completely bonded to the base of the base A spray type waterproofing agent composition and a waterproofing primer composition for preparing a primer composition, which is used for waterproof construction, to improve the waterproofing effect, convenience of construction, extension of the life of the waterproofing coating, and prevention of dew condensation and whitening. will be.

Generally, the waterproofing agent used in the construction and civil engineering fields includes asphalt waterproofing, sheet waterproofing, and coating waterproofing.

Asphalt-based waterproofing is the longest method in history, which has the advantages of high reliability and low cost. However, it can not change the color and odor occurs and its use is gradually being reduced. Sheet waterproofing is mainly done by using adhesives or hinges. Bonding to and constructing on the surface often causes defects in the bonding and joint joint portions. The coating waterproofing agent has no contamination or odor and is excellent in appearance and performance, but has a disadvantage in that coating defects are easily generated due to a thin coating thickness.

In addition, most of the coating film waterproofing agents currently used are polyurethane-based, but these waterproofing agents have a problem of aging in a short period of time and poor flexibility. That is, since the corresponding function of the coating waterproof layer is poor in the change of the base-based crack generation, thermal expansion, etc., problems such as breakage and cracking of the waterproof layer occur.

In particular, steel bridges and concrete bridges are constructed by laying asphalt with a thickness of about 40 to 50 mm on a waterproofing agent, so a waterproof coating layer is required that does not crush or stretch even under coaxial loads applied to the system. However, the conventional flexible coating waterproofing agent aging or surface peeling occurs when compression and expansion occur frequently, and the adhesion of the base and the waterproofing coating layer, and the waterproofing coating layer and the asphalt layer is weakened, resulting in bridge life. There is a problem of shortening.

Therefore, the waterproofing agent is generally applicable to the place where the load is not applied a lot, there is a problem that the physical properties are still insufficient for use in steel bridges or concrete bridges with a lot of vehicle traffic.

As such, the conventional waterproofing agent has problems such as breakage, cracking, weather resistance and durability of the waterproof coating due to the cracking and breaking of the structure, and thus has excellent elasticity and strength to withstand severe coaxial loads and excellent adhesion to the underlying substrate. The development of coating waterproofing agent is urgently required.

The present invention is to provide a spray type waterproofing agent composition composed of a component containing a (meth) acryl monomer and a polyurethane (meth) acrylate in order to have high elasticity, high strength, weather resistance and durability.

The present invention is to provide a waterproof primer composition composed of a component containing a methacryl monomer and an epoxy resin to excellent adhesion between the base and the waterproof coating layer.

1 is a cross-sectional view showing a waterproof coating film waterproof structure using a spray type waterproofing agent composition and a waterproof primer composition according to the present invention.

It is a figure explaining the adhesive evaluation of a waterproof primer composition.

[Description of Symbols for Main Parts of Drawing]

1: not based 2: primer layer

3: waterproof coating layer

The present invention comprises 20 to 50% by weight of (meth) acrylic monomer and 25 to 60% by weight of polyurethane (meth) acrylate, 10 to 30% by weight of filler, 0.3 to 1.0% by weight of curing agent and 0.15 to 2.0% by weight of curing accelerator. It is characterized by the spray type waterproofing agent composition.

The present invention further features a waterproof primer composition containing 30 to 50% by weight of a methacryl monomer, 10 to 20% by weight of an epoxy resin, 1 to 5% by weight of a curing agent and a curing aid, and 25 to 50% by weight of a volatile solvent.

Referring to the present invention in more detail as follows.

The spray-type waterproofing agent composition according to the present invention will be described in more detail with respect to each component.

As the (meth) acrylic monomer used in the spray type waterproofing agent composition, a methacrylic acid ester, an acrylic acid ester, or a mixture thereof is mixed with a functional (meth) acryl monomer, and the glass transition temperature of the polymer is in the range of 50 to 80 ° C. It is preferable to use one. If the glass transition temperature of the polymer is less than 50 ℃, there is a problem that the strength is lowered, the adhesion to the waterproof coating layer becomes more difficult during post-construction, and if it exceeds 80 ℃, the impact strength is weak due to insufficient elasticity of the cured coating layer. There is a problem. The methacrylate ester is methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, t-butyl methacrylate, cyclohexyl methacrylate, lauryl methacrylate, nonyl methacrylate, stearyl It is preferable to use at least one selected from methacrylates, and at least one selected from methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethyl hexyl acrylate, and lauryl acrylate is used as the acrylic ester. It is desirable to. In addition, the functional (meth) acrylic monomer used for curing at room temperature is hydroxy ethyl (meth) acrylate, hydroxy propyl (meth) acrylate, hydroxy methyl acrylamide, (meth) acrylic acid, fumaric acid, maleic acid. , At least one selected from itaconic acid, glycidyl methacrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, propylene glycol dimethacrylate and trimethylolpropane trimethacrylate. It is preferable to use, and more preferably, one selected from hydroxy ethyl methacrylate, hydroxy propyl methacrylate, acrylic acid and methacrylic acid is used. In particular, the functional (meth) acrylic monomer is preferably used in an amount of 1 to 15% by weight of the total (meth) acrylic monomer, and a monomer having a functional group such as hydroxy or acid, or a monomer having two or more acrylic groups is used. It is preferable. If the amount of the functional (meth) acrylic monomer is less than 1% by weight of the total (meth) acrylic monomer, it is difficult to rapidly harden at room temperature, and when the amount of the functionalized (meth) acrylic monomer is more than 15% by weight, the cured product is too hard and the elasticity is deteriorated. And it is preferable to contain 20-50 weight% of said (meth) acryl monomers in all the waterproofing agent compositions. If the amount is less than 20% by weight, the curing is slow and the strength and durability of the waterproof coating are poor. If the amount is more than 50% by weight, the elasticity of the coating is lowered.

The polyurethane (meth) acrylate used for the spray type waterproofing agent composition is produced by reacting a polyol and an aromatic diisocyanate, and it is preferable to use 25 to 60% by weight in the total waterproofing agent composition. In addition, when the polyol and the aromatic diisocyanate react, it is preferable to prepare the NCO terminal prepolymer by reacting the NCO / OH value of the prepolymer in the range of 1.1 to 2.5. If the NCO / OH value of the prepolymer is less than 1.1, the waterproof coating is too flexible and the strength is lowered. If the NCO / OH value is more than 2.5, the elasticity is lost and elasticity is not provided to the waterproof coating layer.

Then, a (meth) acryl monomer having an active hydrogen group is reacted with the NCO terminal prepolymer prepared above to synthesize a polyurethane (meth) acrylate having a (meth) acryl group. Examples of (meth) acryl monomers that can be used include hydroxyethyl (meth) acrylate, hydroxy propyl (meth) acrylate, and the like.

As the polyol, polypropylene glycol having a molecular weight of 300 to 4000 is preferably used, and polypropylene glycol having different molecular weights is used in combination in the molecular weight range of 300 to 4000 according to the NCO / OH value of the prepolymer, or a polyol having one molecular weight. Can be used alone. At this time, in order to adjust the viscosity, a nonfunctional (meth) acryl monomer may be used as a diluent. The non-functional (meth) acrylic monomer used as the diluent can be selected and used from the above-mentioned (meth) acryl monomers, and the amount of the diluent is mixed from the (meth) acryl monomer when mixing the waterproofing agent composition.

In addition, when the amount of the polyurethane (meth) acrylate is less than 25% by weight of the total waterproofing agent composition, the elasticity of the waterproofing coating is lowered, and when the amount of the polyurethane (meth) acrylate is more than 60% by weight, the properties and durability of the waterproofing agent deteriorate.

The filler used in the spray type waterproofing agent composition stabilizes the physical properties of the waterproofing coating film and prevents changes over time. The filler has one or more selected from kaolin, talc, calcium carbonate, magnesium carbonate, silica and modified substances thereof. It is preferable to use 10-30 weight% of all the waterproofing agent compositions. If the amount of use is less than 10% by weight, the physical property of the waterproof coating is severely changed according to external conditions, and if the amount exceeds 30% by weight, there is a problem in that physical properties are deteriorated. In addition, the viscosity of the composition is controlled by using fillers of different particle sizes, but fillers having a particle diameter of 5 µm or less are used in an amount of 3 to 10% by weight of the total waterproofing agent composition. If the filler content of 5 μm or less is less than 3% by weight, the composition may have a low viscosity, which may result in the formulation flowing down before curing after spray coating, thereby preventing the formation of a uniform coating layer. Spray application does not work.

The curing agent used in the spray type waterproofing agent composition serves to cure the (meth) acryl monomer and the polyurethane (meth) acrylate, and it is preferable to use a radical polymerization initiator in the range of 0.3 to 1.0% by weight of the entire waterproofing agent composition as the curing agent. desirable. If the amount of the curing agent used is less than 0.3% by weight, a very slow curing rate and poor physical properties are formed, and when the amount of the curing agent is more than 1.0% by weight, the elasticity of the waterproof coating is reduced without increasing the curing rate. It is preferable to use hydroxy peroxide or organic peroxide as the radical polymerization initiator used as the curing agent, more preferably t-butyl hydroxy peroxide, cumene hydroxy peroxide, methyl ethyl ketone peroxide, benzoyl per Oxides, t-butyl perbenzoate or 2,2-bis- (t-butylperoxy) -butane and the like are preferably used.

The curing accelerator used in the spray type waterproofing agent composition is used together with the above curing agent to accelerate the curing rate and promote surface curing, and is a polymerization catalyst for increasing the peroxide activity and oxidative crosslinking. And 0.05 to 1.0% by weight of an aromatic amine compound are preferably used in combination.

If the amount of the polyvalent metal compound is less than 0.1% by weight, the surface of the waterproof coating film is not cured, so that post-construction is difficult. If the content of the polyvalent metal compound is greater than 1.0% by weight, the hardness of the cured product is increased, and the amount of the aromatic amine compound is 0.05. If it is less than the weight% is not fast curing, if it exceeds 1.0% by weight the curing rate is too fast, the heat generation is severe and the pot life is short may cause the phenomenon of curing during mixing. The polyvalent metal compound is a naphthenate, octoate, acetylacetonate complex of a transition metal or alkaline earth metal, such as cobalt naphthenate, cobalt octoate, cobalt acetylacetonate, manganese octoate, manganese naphthenate or Manganese acetylacetonate and the like are preferable, and cobalt salt is more preferable. Aromatic amine compounds include aniline, N, N-dimethylaniline, N, N-diethylaniline, toluidine, N, N-dimethyl-p-toluidine, N, N-di (hydroxyethyl) toluidine or p-dimethylamino Benzaldehyde and the like are preferred.

Spray type waterproofing agent composition according to the present invention may be added in small amounts, if necessary, in addition to the above components of the plasticizer, stabilizer and pigment.

On the other hand, briefly look at the manufacturing method of the spray type waterproofing agent composition according to the present invention, the (meth) acrylic monomer, polyurethane (meth) acrylate, filler and curing accelerator are uniformly mixed, if necessary defoaming, and then added a curing agent again It can be prepared by mixing uniformly, spraying the prepared spray-proof composition on the base of the base may have a slight difference depending on the season, but after about 5 minutes at room temperature began to cure and after 30 minutes the uncured carbide on the surface And a waterproof coating film having excellent strength and elongation is formed. In order to ensure waterproofing, the waterproofing agent composition may be spray-coated again on the formed coating film to form a secondary waterproofing coating layer. At this time, if the color of the two layers using a different color, it is easy to find out the defect in each layer.

In addition, the present invention includes a waterproof primer composition applied on the base of the base to increase the adhesion of the base layer and the waterproof coating layer using the spray type waterproofing agent composition prepared by the composition.

The waterproof primer composition is composed of 30 to 50% by weight of methacryl monomer, 10 to 20% by weight of epoxy resin, 1 to 5% by weight of curing agent and curing aid, and 25 to 50% by weight of volatile solvent. Explained as follows.

As a methacryl monomer used for a waterproof primer composition, the methacrylic monomer mentioned above in the said spray type waterproofing agent composition is used individually or in mixture so that the glass transition temperature of a polymer may be 50-120 degreeC, and it is 30-50 weight% in all the primer compositions. It is preferable to contain. If the glass transition temperature of the polymer is less than 50 ° C., the flowability of the cured product is increased, resulting in a problem that strong adhesion does not occur. When the content of the methacryl monomer is less than 30% by weight, poor adhesion with the waterproof coating layer may occur, and when the content of the methacryl monomer is greater than 50% by weight, the adhesive may be cured with a non-adhesive coating film.

The epoxy resin used in the waterproof primer composition may be a liquid having a viscosity at 25 ° C. of 10,000 cps or more, or a solid bisphenol A type, bisphenol F type, novolac epoxy resin, or phenoxy resin having a softening point of room temperature or more. It is preferable to use, and the usage-amount is 10-20 weight% in the whole primer composition. If the amount is less than 10% by weight, the adhesive strength is lowered, and if the amount is more than 20% by weight, the adhesion between the waterproof coating layer and the base is lowered. And when the viscosity of an epoxy resin is too low, the problem that a strong adhesive force is not obtained arises.

The curing agent used in the waterproof primer composition is a hydroxy peroxide or organic peroxide compound used in the spray type waterproofing agent composition, and may be dissolved in a mixture of other compositions immediately before application.

As a curing aid used in the waterproof primer composition, it is preferable to use propylene glycol monoethyl ether acetate in an amount of 0.1 to 4% by weight in the total primer composition.If the amount is more than 4% by weight, the effect of promoting curing is no longer expressed. It doesn't work.

The solvent used in the waterproof primer composition uses a volatile solvent having good compatibility with the (meth) acrylic monomer and the epoxy resin in the total primer composition in 25 to 50% by weight, preferably acetone, methyl ethyl ketone, methyl isobutyl ketone, It is preferable to use at least one selected from cyclohexanone, toluene, xylene, ethyl acetate, butyl acetate, cellosolve, cellosolve acetate, methyl cellosolve, ethyl cellosolve and butyl cellosolve.

The waterproof primer composition according to the present invention has good wettability and adhesion to concrete or steel and can be quickly cured so that the construction of the waterproof coating layer is possible after 30 minutes of application and perfectly adheres the concrete and the waterproof coating layer.

As such, when the waterproofing coating is performed using the spray-type waterproofing agent composition and the waterproofing primer composition according to the present invention having excellent properties, the waterproofing effect can be improved, the convenience of construction, the life of the waterproofing film, condensation and whitening can be prevented. .

Although this invention is demonstrated in detail based on an Example, this invention is not limited to an Example.

Examples 1 to 4. Spray type waterproofing agent composition

Preparation Example 1 Preparation of Polyurethane (meth) acrylate

500 g of polypropylene glycol having a molecular weight of 2000, 136 g of polypropylene glycol having a molecular weight of 400, and 221.25 g of diphenylmethane-4,4'-diisocyanate were added to the reactor, and nitrogen was injected therein. Stir until the content reached the theoretical value. When the NCO content reached the theoretical value, 76.78 g of hydroxy ethyl methacrylate was added and stirring was continued at 70 ° C. until no more NCO remained by FT-IR. If unreacted NCO no longer remained, the reaction was terminated by cooling to room temperature.

Preparation Example 2 Preparation of Polyurethane (meth) acrylate

Polyurethane acrylate was prepared in the same manner as in Production Example 1, except that 500 g of polypropylene glycol having a molecular weight of 1000, 162.5 g of diphenylmethane-4,4'-diisocyanate, and 39.04 g of hydroxyethyl methacrylate were added thereto. It was.

<Waterproof coating layer manufacturing>

Next, according to the composition and content shown in Table 1, the composition components except for the curing agent (benzoyl peroxide) were uniformly mixed. The curing agent was added to the homogeneously mixed mixture, and the mixture was uniformly mixed again for about 15 seconds to prepare a spray type waterproofing agent composition, and then poured into a Teflon mold having a thickness of 5 mm to prepare a waterproof coating layer.

Comparative Examples 1 to 7. Spray Type Waterproofing Agent Composition

Preparation Example 3 Preparation of Polyurethane

Polyurethane was prepared in the same manner as in Preparation Example 1, except that 26.55 g of butanediol was used instead of hydroxy ethyl acrylate.

<Production of Waterproofing Coating Layer>

Next, a waterproof coating layer was prepared by the method according to Example 1, using the composition components and contents shown in Table 2.

Test Example 1.

Various physical properties were tested according to the following test methods, and the results are shown in Table 3.

<Test method>

1.Measuring curing time

After the spray-type waterproofing agent composition was poured into the Teflon mold, it was confirmed that the internal hardening was progressed by auger, and then the physical time was applied to the surface of the coating film using a stainless steel spatula to set the time when the uncured material was not scratched.

2. Evaluation of Vertical Flowability of Spray Type Waterproofing Agent Composition

The spray type waterproofing agent composition was applied to the plywood at a thickness of about 5 mm and then stood vertically and left until the completion of curing. After curing was completed, the degree of flowability was visually determined, and when it flowed, it was marked as flowing down, not flowing, but sagging if it was hit by thickness, and no flow or sagging.

3. Hardness

The test piece was molded into a bar-shaped mold having a thickness of 5 mm, and the scale was read after the pressing surface of the hardness tester was pressed parallel to the surface of the test piece using a shear D type hardness tester. The measured value was averaged after 10 repeated measurements.

4. Tensile Strength and Elongation

Specimen size was Die C type dumbell type test piece (W 5mm × L 20mm) and the measuring method was measured at 200mm / min tensile speed according to the method of KS M6518.

As shown in Table 3, Examples 1 to 4 of the spray-type waterproofing agent composition according to the present invention was confirmed that not only the curing time is short, but also high strength and high elasticity, whereas Comparative Examples 1 to 7 have a curing time Long or low strength or low elasticity was confirmed.

Examples 5-7 and Comparative Examples 8-10. Waterproofing primer composition

<Production of Waterproofing Primer Composition>

According to the composition of Examples and Comparative Examples of Table 4, after weighing in a beaker and stirred for about 20 to 30 minutes until a uniform state to prepare a waterproof primer composition.

<Adhesion evaluation>

The prepared waterproof primer composition was applied on cement mortar in the following manner to evaluate the adhesion, and the results are shown in Table 4 below.

After applying the waterproof primer composition on the cement mortar and dried at room temperature for 30 minutes, the spray type waterproofing agent composition of Example 1 was poured and cured. After 12 hours of curing, the edges of the waterproof coating were scratched with a knife, lifted up, and peeled to check the state of destruction. Next, Table 4 shows the description of cement breakdown, interfacial peeling, and adhesive layer breakdown, which show adhesion states.

As shown in Table 4, in the case of Examples 5 to 7 to which the primer composition according to the present invention was applied on the base of the foundation, it was confirmed that the adhesive strength was excellent enough to cause cement breakdown.

As described above, the spray-type waterproofing agent composition according to the present invention forms a highly elastic, high-strength coating film to prevent breakage of the waterproofing layer due to cracks and rupture of the structure, weather resistance, durability, load resistance is good, waterproof primer composition is not Since the adhesion between the base and the waterproof coating layer is excellent, the waterproofing construction using these materials improves the waterproofing effect, it is easy to install due to the fast curing, and has a high strength and high elasticity property, so that the water surface of the waterproof coating is extended, condensation and whitening phenomenon There is an effect that can prevent.

Claims (3)

A waterproof primer composition comprising 30 to 50% by weight of a methacryl monomer, 10 to 20% by weight of an epoxy resin, 1 to 5% by weight of a curing agent and a curing aid, and 25 to 50% by weight of a volatile solvent. The waterproof primer composition according to claim 1, wherein the methacryl monomer has a glass transition temperature of 50 to 120 ° C of the polymer. The waterproof primer composition according to claim 1, wherein the epoxy resin has a viscosity at 25 ° C of 10,000 to 100,000 cps or a softening point of room temperature to 150 ° C.