KR102028103B1 - Slow drying and highly stretchable polyurea coating composition with high hardness, method of use the same and waterproof method using the same - Google Patents

Abstract

The present invention relates to a 2-component polyurea coating material composition used for waterproofing and root penetration resistance construction in a space such as a roof of a building, to a use method thereof, and to a waterproofing and root penetration resistance method using the same and, more specifically, to 2-component polyurea coating material composition having slow drying, high hardness and high elasticity, which improves strength, hardness, and elasticity of a coating material by using amine having two carbonyl groups and one hydrogen as a curing agent reacting with the isocyanate contained in a main agent part, and reduces the reactivity with the isocyanate to extend the pot life.

Description

Slow drying and highly stretchable polyurea coating composition with high hardness, method of use the same and waterproof method using the same

The present invention relates to a fat-drying, high hardness and high-strength polyurea coating material composition, a method of using the same, and a waterproof waterproofing method using the same, and more particularly, to a secondary amine, specifically, a secondary amine having two carbonyl groups. The present invention relates to a two-component polyurea coating material composition which can not only improve the strength, hardness and elasticity of the coating material, but also reduce the reactivity with isocyanate to extend the pot life, a method of using the same, and a waterproof waterproofing method using the same.

Buildings such as concrete structures have a problem in that durability is weakened due to leakage and condensation due to cracking over time. In particular, in recent years, as the building is enlarged, a large number of planar rooftops are constructed. In the case of planar rooftops, rainwater is easily collected due to structural rain, and thus the possibility of leakage is higher, so that aging by rainwater proceeds more quickly.

Therefore, waterproof construction is essential to prevent leakage from the roof of the building, and currently, a waterproofing method using a waterproof sheet including an asphalt layer or a waterproofing method using a waterproof coating containing a polymer resin is used. In this case, rubber-based resins, polyurethane resins, polyurea resins, epoxy resins, and the like are used as the waterproofing paints used at this time.

Generally, polyurethane resins are obtained by reaction of polyols or compounds based on polyols with isocyanates, and suitable catalysts and hardeners are used together to improve reactivity. Polyurethane resins are widely used as coating materials because they have good water resistance, chemical resistance, wear characteristics, and gloss characteristics.

Polyurea resins are obtained by the reaction of polyamines or polyamine base compounds with isocyanates, and since the reaction of amines and isocyanates is fast enough, unlike urethane resins, catalysts are not generally used, but catalysts are used to promote curing depending on the environment. Sometimes.

Polyurea resins are classified as special polyurethane resins and, like polyurethane resins, are not only excellent in water resistance and chemical resistance, but also have better abrasion resistance, heat resistance, and stability than polyurethane resins. O is due to the combination of additional carbon (C) and nitrogen atoms (N). In addition, the polyurea resin is excellent in compressive strength, excellent in acid resistance, alkali resistance, good resistance to ultraviolet rays and low temperature dependence has the advantage that it can be installed even in winter.

However, as mentioned above, the reaction between the amine and the isocyanate is fast, so that the pot life of the polyurea composition, i.e., the time immediately after mixing the amine and the isocyanate, is very short, within 20 minutes, until the polyurea composition is gelled or cured. The simple painting mechanism is difficult to work with workability, there is a problem that the defect easily occurs unless a skilled skilled person works.

Korean Registered Publication No. 10-1285208 minimizes the use of dimethyltoluenediamine, a chain extender that induces an explosive reaction, and instead slows down the reaction rate by using a slow reaction of methylenebisoxychloroaniline, and improves mechanical properties. Although a rigid polyurea spray composition is proposed, only the curing rate is controlled, and since the pot life is short around 16 minutes, there is a problem that problems such as deterioration of workability due to the pot life and an increase in the incidence of defects still exist.

Registered Patent No. 10-1285208 (registered July 5, 2013)

In the present invention, by using the amine as a secondary amine having one hydrogen group and two carbonyl groups, not only improves the strength, hardness, and stretchability of the coating material, but also decreases the reactivity with isocyanates, which can extend pot life, and high hardness. The present invention provides a highly elastic two-component polyurea coating material composition, a method of using the same, and a waterproof waterproofing method using the same.

One embodiment of the present invention for achieving the object as described above relates to a two-component polyurea coating material composition, wherein the two-component polyurea coating material composition, each of the main portion comprising an individual isocyanate packaged; And a hardening part including an amine including one hydrogen group and two carbonyl groups. When the main part and the hardening part are used in a weight ratio of 1: 1.1 to 1.7, the pot life may be controlled.

The amine contained in the hardened part may include a secondary amine having a weight average molecular weight of 270 to 300.

The amine is a mixture of secondary amines having at least two or more different weight average molecular weights, 70 to 87 wt% of low molecular weight secondary amines having a weight average molecular weight of 270 to 300, and high weight average molecular weights of 2,000 to 3,000. It may comprise 13 to 30% by weight molecular weight secondary amine.

The hardening part may further include a primary amine adduct obtained by the reaction of diethylenetriamine and butyl glycidyl ether in the range of 1 to 7% by weight.

The hardening unit may further include at least one or more additives selected from the group consisting of fillers, plasticizers, diluents, antisettling agents, antifoaming agents, dispersants, and pigments.

Isocyanate contained in the said main part, NCO% may be 15-25.

Another embodiment of the present invention relates to a method for using a two-component polyurea coating material composition, comprising 42 to 57% by weight of a secondary amine containing two carbonyl groups, 1 to 7% by weight of a primary amine adduct and 40 to 40% of an additive. Curing unit preparation step comprising 54% by weight; And a mixing step of mixing the hardened part and a main part including an isocyanate having an NCO% of 15 to 25 in a weight ratio of 1.1 to 1.7: 1.

The secondary amine may include a low molecular weight secondary amine having a weight average molecular weight of 270 to 300 and a high molecular weight secondary amine having a weight average molecular weight of 2,000 to 3,000.

The primary amine adduct may be obtained by a reaction of diethylenetriamine and butyl glycidyl ether.

The additive may include at least one selected from the group consisting of fillers, plasticizers, diluents, antisettling agents, antifoaming agents, dispersants, and pigments.

Another embodiment of the present invention relates to a waterproof waterproof construction method using a two-component polyurea coating material composition, the foreign material removal step of making the deposition surface flat by removing the foreign matter present on the surface to be coated waterproof coating; Preparing a polyurea coating material composition for preparing a two-component polyurea coating material composition according to an embodiment of the present invention described above; Coating the polyurea coating material composition on an adhered surface from which foreign matter has been removed; And a curing step of curing the coating material formed in the coating material forming step.

At this time, the primer layer forming step of forming a primer layer by applying a primer containing a polyurethane-based resin before the coating material forming step; may be further performed.

The high hardness and high elastic two-component polyurea coating material composition of the present invention not only has excellent strength, hardness and elasticity of the coating material, but also uses an amine having one hydrogen group and two carbonyl groups when preparing the coating material composition. By reducing the reactivity with isocyanate and extending the pot life, it is possible to work with a simple coating device, and at the same time, the drying time can be reduced to improve workability and lower the defect rate.

In addition, by adjusting the content ratio of the additive, not only the extension of the pot life but also the reduction effect can be obtained.

Prior to the following description in detail through the preferred embodiment of the present invention, terms or words used in the present specification and claims should not be construed as limited to the conventional or dictionary meanings, meanings corresponding to the technical spirit of the present invention To be interpreted as

Throughout this specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless otherwise stated.

Polyurea resin is obtained by reaction of isocyanate with polyamine or polyamine base compound. Polyurea resin thus obtained is excellent in water resistance, chemical resistance, abrasion resistance, heat resistance and stability, high compressive strength and strong against ultraviolet rays, Widely used for waterproof construction in place.

However, due to the fast reaction rate of isocyanate and amine, hardening of the surface of the coating material exposed to the air occurs quickly while curing between the coating material and the adhered surface on which the coating material is constructed is slow, resulting in a decrease in the strength of the coating material. Also occurs.

In the present invention, in order to solve this problem, a secondary amine containing one hydrogen group and two carbonyl groups is used as the curing agent as the amine reacting with the main isocyanate. The amine has a merit that the reactivity of the hydrogen group is reduced by two carbonyl groups, so that the reaction proceeds after a predetermined time without being immediately reacted when mixed with an isocyanate. Thus, the pot life is longer than that of the conventional polyurea resin.

More specifically, the two-component polyurea coating material composition of the present invention is a separately packaged cured part including a main part including an isocyanate and a secondary amine including one hydrogen group and two carbonyl groups, and the main part and The hardened part may be mixed and used in a weight ratio of 1: 1.1 to 1.7.

When the weight ratio of the cured portion to the main portion during use is less than 1.1, since the content of the cured portion is insufficient and hardening is not performed, there is a problem in that adhesiveness, water resistance, chemical resistance, stability, strength, etc. of the coating material are lowered as a result. On the other hand, if the weight ratio of the hardened part to the main part exceeds 1.7, the hardened part remaining even after the complete curing lowers the adhesive strength or the elongation of the coating material, which can be easily damaged by external pressure, and the characteristics at low temperatures Since it lowers, it is preferable to mix so that a hardening part and a main part may have the weight ratio mentioned above.

The main part may include isocyanates, for example, 4,4'-diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (Hexamethylene diisocyanate (HDI), dicyclohexylmethane diisocyanate (H12MDI), isophorone diisocyanate (IPDI) and at least one of the group consisting of triphenylmethane triisocyanate to be used Can be.

In particular, an isocyanate having an NCO mol% of 15 to 25 is preferably used as the isocyanate included in the main part, and hexamethylene diisocyanate may be used as the isocyanate.

The secondary amine contained in the hardening part is preferably a weight average molecular weight of 270 to 300, more preferably a mixture of secondary amines having a weight average molecular weight of 270 to 300 and secondary amines having a weight average molecular weight of 2,000 to 3,000. It is preferable to use.

In this case, the secondary amine having a weight average molecular weight of 2,000 to 3,000 may be a secondary amine including one hydrogen group and two carbonyl groups in which a linear chain is introduced into the molecular structure to increase the molecular weight, and the secondary amine may have a weight average molecular weight. By using together with the secondary amine of 270 ~ 300 by the linear chain it can improve the elasticity and tensile strength of the coating material to improve the durability of the coating material.

In this case, the secondary amine having a weight average molecular weight of 270 to 300 (hereinafter, low molecular weight secondary amine) may be included in 70 to 87% by weight, and the secondary amine having a weight average molecular weight of 2,000 to 3,000 (hereinafter, high molecular weight 2). Secondary amine) may be included in 13 to 30% by weight, the elasticity of the coating material is significantly improved when the low molecular weight secondary amine is used in less than 70% by weight or the high molecular weight secondary amine in excess of 30% by weight Although there is an advantage, there is a problem in that tensile strength and hardness are lowered due to excessively increased elasticity, and when the low molecular weight secondary amine is included in excess of 87% by weight or the high molecular weight secondary amine is used in less than 13% by weight. Since the effect of increasing the elasticity and the tensile strength obtained by using a high molecular weight secondary amine together is insignificant, when the low molecular weight secondary amine and the high molecular weight secondary amine are mixed and used, it is within the above-described weight range. Be used in combination is preferred.

The use of such secondary amines has the advantage of improving the physical and chemical properties of the coating material and at the same time ensuring optimal pot life. Optimal pot life is 30 ~ 60 minutes, longer than the pot life of 20 minutes, the general polyurea resin improves workability, there is an advantage that can work using a simple paint mechanism.

If the pot life is less than 30 minutes, as described above, it is impossible to secure sufficient working time and workability is lowered. If the pot life exceeds 60 minutes, drying and curing are excessively delayed, thereby increasing the work time twice. Therefore, securing proper pot life is very important in coating material forming work.

Since the two-component polyurea coating material composition of the present invention includes the secondary amine described above in the curing portion, there is an advantage that the pot life of 30 to 60 minutes is secured. However, when only the secondary amine is used, not only the pot life but also the curing time is prolonged, and the difference in curing rate between the surface of the coating material and the inside increases, thereby causing a problem of strength deterioration.

In order to solve this problem, the hardening part may further include a primary amine adduct obtained by the reaction of diethylenetriamine and butyl glycidyl ether. By including the duct can reduce the curing time, improve the strength of the coating material, there is an advantage to secure the desired pot life by adjusting the weight ratio of diethylene triamine and butyl glycidyl ether.

The primary amine adduct may be included in 1 to 7% by weight in the hardened portion, when included in less than 1% by weight it is difficult to obtain the above-mentioned curing time reduction, strength improvement and pot life control effect, 7% by weight When it exceeds the pot life increase effect is reduced, it is difficult to obtain the workability and the coating material properties improvement effect by extending the pot life to be obtained in the present invention, it is preferably included within the above-described weight range.

The primary amine adduct can be obtained by reacting diethylenetriamine with butyl glycidyl ether, wherein diethylenetriamine and butyl glycy are used in the reaction. Butyl glycidyl ether is preferably reacted by mixing in a weight ratio of 1: 2 to 4, when the weight ratio is less than 1: 2, there is a problem that the pot life is shortened, and when it exceeds 1: 4 Since the coating material property improvement effect is insignificant, it is preferable to be included in the weight range mentioned above.

The hardening part may further include an additive for obtaining an effect of improving workability, improving physical properties, etc., wherein at least any one selected from the group consisting of fillers, plasticizers, diluents, antisettling agents, antifoaming agents, dispersants, and pigments is used as the additive. One or more may be used.

The additive is preferably contained in the hardened portion at 40 to 54% by weight. When the content of the additive is less than 40% by weight, the effects of improvement of workability and physical properties by the additive are insignificant, and when the content exceeds 54% by weight. This is because the excessive additives may worsen the workability or lower the physical properties.

Such additives are preferably 75 to 87 wt% of filler, 7 to 16 wt% of plasticizer, 3 to 7 wt% of diluent, 0.8 to 2.0 wt% of antisettling agent 0.5 to 3.3 wt% of antifoam, 0.5 to 2.0 wt% of dispersant, and pigment 0.5 Additives comprising ˜2.0 wt% may be used.

The filler is added to improve the strength of the coating material, preferably an inorganic filler can be used. As such an inorganic filler, for example, calcium carbonate, titanium dioxide, barium sulfate, glass fibers, talc, mica, talc and the like can be used, and it is particularly preferable to use a mixture of calcium carbonate and titanium dioxide. The filler may be used in the additives at 75 to 87% by weight, and when used at less than 75% by weight, it is difficult to obtain the effect of increasing the strength by the filler, and when used in excess of 87% by weight, the strength is caused by the excess filler. Can be lowered.

The plasticizer may be added to improve processability and flexibility of the coating material, and such plasticizers include diethylhexyl phthalate (DOP), diisononyl phthalate (DINP), and diisodecyl phthalate (Diisodecyl). phthalate (DIDP), dibutyl phthalate (DBP), tri- (2-ethylhexyl) trimellitate (TOTM) and the like can be used, and 7 to 16% by weight of It may be included in the weight range.

When the content of the plasticizer is less than 7% by weight, it is difficult to obtain an effect of improving workability and flexibility, and when the content of the plasticizer is more than 16% by weight, plasticizer migration and elution by excessive plasticizers occur. It is preferred to be used.

The diluent is added to improve the processability by lowering the viscosity of the coating material composition, toluene, xylene, acetone, methyl ethyl ketone, cyclohexane, diethanolamine, diethylene glycol, glycerol acetate may be used, The present invention is not limited thereto, and various conventional diluents or solvents used to dilute the polymer resin may be used.

The content of the diluent included in the additive may be 3 to 7% by weight, and when the content of the diluent is less than 3% by weight, it is difficult to obtain the above-described effects. It is preferable to be used within the above-described weight range because it is difficult to form a coating film, and as a result, it may be difficult to control the physical properties of the coating film.

The anti-settling agent is added to prevent the sedimentation of particulate matter such as the filler included in the hardened portion, commercial products such as Monoral ^® 3300 may be used, but is not limited thereto. The anti-settling agent is preferably included in the 0.8 ~ 2.0% by weight, when included in less than 0.8% by weight of the sedimentation prevention effect of the particulate material is lowered, if it exceeds 2.0% by weight additional sedimentation prevention effect by the excess amount Because is insignificant.

The antifoaming agent is added to remove bubbles generated in the composition or to suppress the generation of bubbles, and may be a silicone-based antifoaming agent, a polyester-based antifoaming agent, or a mixture thereof, but is not limited thereto. The preferred amount of the antifoaming agent is 0.5 to 3.3% by weight, and when the antifoaming agent is contained in less than 0.5% by weight, the effect of removing bubbles and suppressing the formation of bubbles is insignificant. This can change.

The dispersant is added to uniformly disperse each component in the coating material composition, and is anionic dispersant having an acidic functional group such as phosphoric acid, sulfuric acid or carboxylic acid, or a salt thereof, a cationic having a basic functional group or a salt thereof. Dispersants, nonionic dispersants or mixtures of dispersants comprising at least two or more thereof may be used.

Dispersant in the hardened portion may be contained in 0.5 to 2.0% by weight, when included in less than 0.5% by weight is difficult to obtain a sufficient dispersing effect, when contained in excess of 2.0% by weight of the coating material due to the excess of the dispersant It is preferable to use within the above-described weight range because degradation may appear.

The pigment is added to give various colors to the coating material to improve the appearance, carbon black, graphite, titanium black, phthalocyanine complex compound, iron oxide, zinc oxide, cyanine compound, phosphorus compound, quinone compound, Perry Non-based compounds, isoindolinone-based compounds, thio indigo-based compounds and the like can be used, but is not limited thereto.

The content of the pigment may be 0.5 to 2.0% by weight, and when included in less than 0.5% by weight, the color due to the pigment is not sufficiently expressed, and when the content is more than 2.0% by weight, the physical property of the coating material due to the excess pigment is reduced. As it may appear, it is preferred to be used within the above-described weight range.

As described above, when the hardening portion includes secondary amines, primary amine adducts and additives, 42 to 57% by weight of secondary amines, 1 to 7% by weight of primary amine adducts and 40 to 54% by weight of additives It may include.

At this time, when the content of the secondary amine is less than 42% by weight, it is difficult to obtain the effect of improving the physical properties and extending the pot life by the secondary amine, and when it exceeds 57% by weight, the pot life becomes excessively long and the workability Since it falls, it is preferable to use within the weight range mentioned above.

On the other hand, the hardened portion may further include pyridine-2-carboxyamide as a strength enhancer, it is possible to obtain the effect of improving the adhesive strength and tensile strength by containing pyridine-2-carboxyamide.

When pyridine-2-carboxyamide is included, it may be included in the content range of 1 to 3% by weight, and when included in less than 1% by weight, it is difficult to obtain a sufficient strength improving effect, and 3% by weight When included in excess, it is preferable to be included within the above-described weight range because there is a problem that cracks easily occur.

Another embodiment of the present invention relates to a method of using a two-component polyurea coating material composition, and the two-component polyurea coating material composition referred to here is the same as described in the above-described embodiment of the present invention, and thus redundant description will be omitted. .

The method of using the two-component polyurea coating material composition, first, preparing a hardened part including 42 to 57 wt% of secondary amine, 1 to 7 wt% of primary amine adduct, and 40 to 54 wt% of additive; And a mixing step of mixing the hardened part and a main part including an isocyanate having an NCO% of 15 to 25 in a weight ratio of 1.1 to 1.7: 1.

The curing unit preparation step may be a step of preparing a curing unit obtained by mixing each component and stirred for 30 to 90 minutes at 1200 ~ 1700 RPM at 70 ~ 120 ℃ after cooling to room temperature.

In this step, a hardening portion may be prepared by optionally adding a strength enhancing agent pyridine-2-carboxyamide.

In this case, the secondary amine may include two carbonyl groups, and may be a mixture of secondary amines having at least two different weight average molecular weights. Preferably, a mixture of 70 to 87% by weight of a low molecular weight secondary amine having a weight average molecular weight of 270 to 300, and a secondary amine comprising 13 to 30% by weight of a high molecular weight secondary amine having a weight average molecular weight of 2,000 to 3,000. Can be.

The primary amine adduct can be obtained by the reaction of diethylenetriamine and butyl glycidyl ether. More specifically, butyl glycine is maintained in diethylenetriamine while maintaining 55 to 70 ° C. Obtained by dropping cyl ether for 3 to 5 hours.

The additive may be at least one selected from the group consisting of fillers, plasticizers, diluents, antisettling agents, antifoaming agents, dispersants, and pigments.

Another embodiment of the present invention relates to a waterproof waterproof construction method using a two-component polyurea coating material composition, and more specifically, to remove the foreign matter to make the surface to be coated waterproof coating film to remove foreign matter; Preparing a two-component polyurea coating material composition; Coating the two-component polyurea coating material composition on the adhered surface from which foreign matter is removed; And a curing step of curing the coating material formed in the coating material forming step.

First, the foreign material removal step is to remove the foreign matter present on the surface, such as the roof, parking lot, road, etc. to be waterproof waterproof construction, to prevent the problem of unevenness caused by foreign matters or deterioration of adhesive strength, and to make the deposition surface flat To be performed.

The two-component polyurea coating material composition preparing step is to prepare a two-component polyurea coating material composition described in an embodiment of the present invention, the two-component polyurea coating material composition described through an embodiment of the present invention previously To prepare a step, mixing the main portion and the hardened portion.

The coating material forming step is a step of applying a two-component polyurea coating material composition prepared through the two-component polyurea coating material composition preparation step to remove the foreign matter flattened surface, using a brush, roller, spray, etc. The thickness of the polyurea coating material composition to be applied is not particularly limited, and may be formed in various thicknesses according to the place or use of waterproof waterproof construction.

The curing step is a step of leaving the two-component polyurea coating material composition applied to the surface to be adhered and completely curing to form a coating film.

The two-component polyurea coating material composition may be installed in the upper part after the construction as a waterproof root repellent material, or may be used for exposure without the rootless installation, the step of selectively installing the rootless after the curing step additionally May be performed further.

Meanwhile, a primer layer forming step of forming a primer layer by first applying a primer containing a polyurethane-based resin to the adhered surface before the coating material forming step may be further performed, such a polyurethane-based primer layer is formed Thereby, the adhesive force with respect to the to-be-adhered surface of the polyurea coating layer of this invention can be improved further.

Hereinafter, to prepare a two-component polyurea coating material composition according to an embodiment of the present invention, it will be described the specific actions and effects of the present invention. However, this is presented as a preferred example of the present invention, the scope of the present invention is not limited according to the embodiment.

[ Production Example ]

Each component was mixed according to the mixing ratios shown in Table 1 below, the temperature was raised to 80 ° C. under a nitrogen atmosphere, the mixture was stirred for 1 hour at a rate of 1,500 RPM, completely mixed, and left at room temperature to cool to room temperature to prepare a hardened part.

Thereafter, 540 g of the hardened part and 460 g of hexamethylene diisocyanate having 15 to 25 NCO% of the main part were mixed and stirred at 800 RPM for 10 minutes to prepare the polyurea coating material composition of Example 1, and the hardened part 590 g And 410 g of the main part was mixed and stirred for 10 minutes at 800 RPM to prepare a polyurea coating material composition of Example 2.

At this time, phthalimide (Phthalimide) was used as the low molecular weight (Mw = 270 ~ 300) secondary amine, and phthalimide and the chain extender 1, 4-butanediol (1) as the high molecular weight (Mw = 3000) secondary amine. , 4 butandiol) was used at 60 ° C. for 60 minutes.

The primary amine adduct used was obtained by dropping 800 g of butyl glycidyl ether into 200 g of diethylenetriamine at 60 ° C. for 3 hours.

As an additive, a mixture of 807 g of a filler, 122 g of a plasticizer, 40 g of a diluent, 11 g of an antisettling agent, 7 g of an antifoaming agent, 7 g of a dispersant, and 7 g of a pigment was used.

In this case, a mixture of calcium carbonate and titanium dioxide was used as a filler, diethylhexyl phthalate as a plasticizer, xylene as a diluent, Monoral ^® -3300 as an antisettling agent, and BYK ^{® as an} antifoaming agent. in the -A535, the dispersing agent is a Disperbyk ^® -106, the pigment was used as the carbon black.

(Unit: g) Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Secondary amine
(Mw = 270-300) 300 300 250 250 250 250 250 Secondary amine
(Mw = 3,000) 50 50 100 100 100 100 100 Primary Amine Adduct
(weight%) - - 9
(1.3) 25
(3.4) 52
(6.8) 6
(0.8) 55
(7.2) additive 360 360 360 360 360 360 360 Sum 710 710 719 735 762 716 765

[ Experimental Example  One]

In order to evaluate the physical properties of the polyurea coating material composition prepared in the above production example, the viscosity in 25 ℃ environment, shear adhesive strength according to ASTM D3163, elongation at break based on ASTM D412, root-proof based on KS F 4938 Performance, pot life using a Barcol hardness tester, Bacol hardness, 25 ℃, 85% relative humidity in the environment of Shyodu gel timer was measured and described in Table 2.

In addition, when the finger is lightly touched to the surface of the polyurea coating material, the test results were measured in Table 2 by measuring the drying time, which is tacky when the composition does not adhere to the fingertips, and the complete drying time when the adhesive disappears completely. The appearance of the coating film was visually observed, and the case where a flat surface was formed without cracks or irregularities was evaluated as good.

Item Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Viscosity (cps) 2,000 2,550 2,900 2,750 2,700 2,900 2,700 Pot life (minutes) 40 45 45 47 52 40 70 Shear Adhesion Strength (kgf / cm ² ) 8 8 17 16 15 9 9 Dry touch time (hr) 3 3 One 2 2 3 5 Complete drying time (hr) 24 24 15 17 18 23 33 Elongation at Break (%) 200 210 510 390 400 280 250 Longitude (barcol) 90 85 96 95 90 90 90 Exterior of dry coating Good Good Good Good Good Good Good Rotting Performance Good Good Good Good Good Good Good

Looking at the results of the experiment in Table 2, the pot life of the polyurea coating material composition comprising a secondary amine containing one hydrogen group and two carbonyl groups is about 45 minutes, 30, which is the optimal pot life of the waterproofing waterproofing coating material It was confirmed that it contained in the range of -60 minutes.

In particular, when the primary amine adduct is used together with the secondary amine together with the secondary amine as in Examples 3 to 5, the pot life is long, but the drying time, especially the complete drying time is significantly reduced, the coating material composition While maintaining the fluidity of the for a long time, since the curing of the coating film occurs quickly after the construction it was found that there is an effect that can improve the workability.

However, in the case of Comparative Example 1, despite the addition of the primary amine adduct, the amount is too small, showing almost the same pot life and drying time as Example 1 without the addition of the primary amine adduct The effect of extending the pot life and reducing the drying time due to the amine adduct was not obtained. In Comparative Example 2, the primary amine adduct was included in excess, so that the pot life was longer than the optimum pot life. In addition, it was confirmed that not only was it longer, but also the shear bond strength was lowered.

Therefore, the primary amine adduct included in the polyurea coating material composition is added in the range of 1 to 7% by weight in order to secure an optimum pot life from the present experiment and to reduce drying time and to obtain an effect of improving strength and elongation. It was confirmed that it is preferable to.

[ Experimental Example  2]

A polyurea coating material composition was prepared in the same manner as in Preparation Example 1, except that 300 g of diethylenetriamine and 700 g of butyl glycidyl ether were used to prepare a primary amine adduct.

Each polyurea coating material composition was prepared according to the blending ratio of Table 3, after which the same physical properties as in Experimental Example 1 was performed and the results are shown in Table 3.

Example 1 Example 6 Example 7 Example 8 Comparative Example 3 Comparative Example 4 Curing Part
(g) Secondary amine
(Mw = 270-300) 300 250 250 250 250 250 Secondary amine
(Mw = 3000) 50 100 100 100 100 100 Primary Amine Adduct
(weight%) - 8
(1.1) 30
(4.1) 52
(6.8) 6
(0.8) 54
(7.1) additive 360 360 360 360 360 360 Sum 710 716 718 740 762 764 Experiment
result Viscosity (cps) 2,000 3,100 3,000 2,950 2,900 2,750 Pot life (minutes) 40 38 37 35 40 24 Shear bond strength
(kgf / cm ² ) 8 18 18 20 8 10 Dry touch time (hr) 3 One One One 3 One Complete drying time (hr) 24 12 12 12 22 10 Elongation at Break (%) 200 420 500 460 220 450 Longitude (barcol) 90 96 95 95 95 95 Exterior of dry coating Good Good Good Good Good Bad Rotting Performance Good Good Good Good Good Bad

In Examples 1 and 6 to 8 of the experimental results of Table 3, the primary amine adduct obtained by reacting diethylenetriamine and butyl glycidyl ether at a weight ratio of about 1: 2.3 was used. When the pot life of the polyurea coating material composition is somewhat shorter, it can be seen that the adhesive strength, complete drying time and elongation at break significantly improved.

However, as can be seen from the experimental results of Comparative Example 3 and Comparative Example 4, when the content of the added primary amine adduct is less than 1% by weight, such an effect did not appear, and when it exceeds 7% by weight, pot life And the complete drying time is excessively short, so that cracks are formed on the appearance of the dry coating film, and accordingly, the rooting performance was poor.

Therefore, in the present experiment, the same results as in Experimental Example 1 were obtained, and the pot life and drying time were adjusted according to the content ratio of diethylenetriamine and butyl glycidyl ether used to prepare the primary amine adduct. Could confirm.

[ Experimental Example  3]

To prepare a polyurea coating material composition in the same manner as in Preparation Example, but mixing the cured portion and the main portion in the content of 540 g, 460 g, respectively, and to the hardened portion pyridine-2-carboxyamide in Table 4 It was prepared by adding according to the combination ratio described.

(g) Example 4 Example 9 Example 10 Example 11 Example 12 Example 13 Secondary amine (Mw = 270-300) 250 250 250 250 250 250 Secondary amine (Mw = 3000) 100 100 100 100 100 100 Primary Amine Adduct 25 25 25 25 25 25 additive 360 360 360 360 360 360 Strength improver
(weight%) - 6
(0.8) 8
(1.1) 15
(2.0) 23
(3.0) 24
(3.2) Sum 735 741 743 750 758 759

Then, for the polyurea coating material composition of Table 4, the shear adhesive strength, elongation at break, rooting performance, pot life, dry contact time and complete drying time measured in Experimental Examples 1 and 2 were measured and dried coating film. The appearance of the film was visually observed, and the results are shown in Table 5, and the tensile strength measurement results based on KS F 3211 were also described.

Example 4 Example 9 Example 10 Example 11 Example 12 Example 13 Pot life (minutes) 47 45 43 40 38 37 Shear Adhesion Strength (kgf / cm ² ) 16 18 25 28 31 32 Tensile strength (kgf / cm ² ) 47 49 77 78 81 82 Dry touch time (hr) 2 2 2 2 2 One Complete drying time (hr) 17 17 17 18 20 22 Elongation at Break (%) 390 360 330 320 320 270 Exterior of dry coating Good Good Good Good Good Bad Rotting Performance Good Good Good Good Good Bad

Referring to the experimental results of Table 5, it can be seen that when the strength enhancer is added as in Examples 9 to 13, the shear bond strength and the tensile strength is improved. However, as can be seen from the experimental results of Example 9, when the content of the strength improver is insufficient, it can be seen that the degree of strength improvement is insignificant. In addition, as in Example 13, when the content of the strength enhancer is excessive, it can be confirmed that cracks occur in the appearance of the dry coating film, thereby deteriorating the rooting performance.

Therefore, it is possible to improve the shear bond strength and the tensile strength by adding pyridine-2-carboxyamide to the polyurea coating material composition, but when the content is less than 1% by weight, the strength improvement is insignificant, and 3% by weight If it exceeds, cracks occur and the rooting performance becomes poor. Therefore, when additionally adding pyridine-2-carboxyamide as a strength enhancer, it is preferable to add it in the weight range of 1 to 3% by weight. I could confirm it.

The present invention is not limited to the above specific embodiments and descriptions, and various modifications can be made by those skilled in the art without departing from the gist of the invention as claimed in the claims. Such variations are within the protection scope of the present invention.

Claims (9)

Main parts comprising isocyanates; And a hardening part including an amine including one hydrogen group and two carbonyl groups, each individually packaged, and when the main part and the hardening part are mixed and used in a weight ratio of 1: 1.1 to 1.7, the pot life is controlled.
The amine is a mixture of secondary amines having at least two or more different weight average molecular weights, 70 to 87 wt% of low molecular weight secondary amines having a weight average molecular weight of 270 to 300, and high weight average molecular weights of 2,000 to 3,000. 13-30 weight% of molecular weight secondary amines, The two-component polyurea coating material composition characterized by the above-mentioned. The method of claim 1,
The amine contained in the said hardening part contains the secondary amine whose weight average molecular weights are 270-300, The two-component polyurea coating material composition characterized by the above-mentioned. delete The method of claim 1,
The hardening part is a two-component type, characterized in that it further comprises a primary amine adduct obtained by the reaction of diethylenetriamine and butyl glycidyl ether in the range of 1 to 7% by weight. Polyurea coating material composition. The method of claim 1,
The hardening part further comprises at least one or more additives selected from the group consisting of fillers, plasticizers, diluents, antisettling agents, antifoaming agents, dispersants, and pigments, two-component polyurea coating material composition. The method of claim 1,
Isocyanate contained in the said main part, NCO% is 15-25, The two-component polyurea coating material composition characterized by the above-mentioned. A hardened part preparation step comprising 42 to 57 wt% of a secondary amine including two carbonyl groups, 1 to 7 wt% of a primary amine adduct, and 40 to 54 wt% of an additive; And
And a mixing step of mixing the hardened part and a main part including an isocyanate having an NCO% of 15 to 25 in a weight ratio of 1.1 to 1.7: 1.
The secondary amine includes a low molecular weight secondary amine having a weight average molecular weight of 270 to 300 and a high molecular weight secondary amine having a weight average molecular weight of 2,000 to 3,000,
The primary amine adduct is obtained by the reaction of diethylenetriamine and butyl glycidyl ether,
The additive is at least any one or more selected from the group consisting of fillers, plasticizers, diluents, antisettling agents, antifoaming agents, dispersants, and pigments, method of using a two-component polyurea coating material composition. Removing foreign matters on the adhered surface to which the waterproof coating film is to be removed to make the adherent surface flat;
A polyurea coating material composition preparing step of preparing a two-component polyurea coating material composition of any one of claims 1, 2 and 4 to 6;
Coating the polyurea coating material composition on an adhered surface from which foreign matter has been removed; And
Waterproofing construction method using a polyurea coating material composition comprising; curing step of curing the coating material formed in the coating material forming step. The method of claim 8,
A primer layer forming step of forming a primer layer by applying a primer containing a polyurethane-based resin before the coating film forming step; further characterized in that the waterproofing construction method using a polyurea coating material composition.