KR101857384B1 - Polyurea composition and waterproof construction method using the same - Google Patents

Abstract

The present invention relates to a polyurea composition used as a waterproofing agent for waterproof construction for buildings. The present invention further relates to a waterproof construction method using the polyurea composition. To this end, the polyurea composition comprises: a base material part composed of 1-10 parts by weight of polyetheramine, 30-40 parts by weight of polyaspartic ester, 10-30 parts by weight of a chain extender, 10-20 parts by weight of a plasticizer, 1-5 parts by weight of a pigment, and 1-10 parts by weight of an additive; and a curing agent part composed of 40-50 parts by weight of an isocyanate-based compound and 50-60 parts by weight of polyalkylene glycol.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyurea composition and a waterproofing method using the polyurea composition.

The present invention relates to a polyurea composition used as a waterproofing agent in a waterproof construction process of a building and a waterproofing method using the same.

Generally, the waterproof construction of a building can be divided into a waterproof sheet construction, a waterproof paint construction, and a composite waterproof construction combining a waterproof sheet and a waterproof paint.

In the case of the waterproof sheet construction, there is an advantage that the thickness of the waterproof layer is uniform, but there is a disadvantage that water leakage occurs at the joint between the sheets or the workability is lowered in a complex structure. In addition, the waterproof paint construction has a merit that it is possible to construct a continuous waterproof surface without a joint part and it is easy to construct even in a building having a complicated structure. However, it is difficult to obtain a smooth film thickness when it is difficult to construct the slope, .

The combined waterproofing works to overcome the disadvantages of the construction of the waterproof sheet and the construction of the waterproof paint, and various construction methods have been developed. However, the composite waterproofing process has a problem that the treatment for seam joints between the sheets is still insufficient and the long-term durability is poor, resulting in leakage frequently. In addition, the sealant or urethane waterproofing agent used in the composite waterproofing process is delayed in drying, so that a long time is consumed in the waterproofing construction, and a glass fiber mesh is used to reinforce the coating film.

In addition, the conventional polyurea waterproofing agent has a quick drying time of less than 30 seconds. Therefore, a special mixing and spraying equipment is required, and it is difficult to fill only the seam between the sheets.

Accordingly, there is a demand for a waterproofing agent capable of securing waterproofness, durability, and pot life during waterproofing and capable of increasing the bonding force between seam joints, and a waterproofing method using the waterproofing agent.

Korean Patent Registration No. 10-1024534

The present invention provides a polyurea composition which is excellent in water resistance and durability and which can increase the bonding force between the sheet-to-sheet joint portions and can secure a pot life during waterproofing.

The present invention also provides a waterproofing method using the polyurea composition.

The present invention relates to a colorant composition comprising 1 to 10 parts by weight of polyetheramine, 30 to 40 parts by weight of polyaspartic ester, 10 to 30 parts by weight of chain extender, 10 to 20 parts by weight of plasticizer, 1 to 5 parts by weight of pigment, And 40 to 50 parts by weight of an isocyanate compound and 50 to 60 parts by weight of a polyalkylene glycol.

The present invention also provides a method for producing a polyurethane foam, which comprises applying a first urethane paint to form an undercoat film, adhering one or more waterproof sheets on the undercoat film, applying the polyurea composition to an edge of the waterproof sheet, And coating a second urethane paint on the waterproof sheet to form an intermediate coat film.

The present invention reinforces the seam of a waterproof sheet by using a ground polyurea composition, thereby realizing a waterproof construction with excellent waterproofness and durability while securing a pot life during waterproof construction.

In addition, since the waterproofing process is relatively easy and simple, the present invention is superior in workability compared to the conventional composite waterproofing process and consumes a small installation cost, thereby achieving shortening of air and cost reduction.

1 is a reference diagram for explaining a waterproofing and applying method of the present invention.
2 is a reference diagram for explaining Experimental Example 2 of the present invention.

Hereinafter, the present invention will be described in detail.

One. Polyurea  Composition

The polyurea composition of the present invention is used as a waterproofing agent and includes a main portion and a hardener portion.

a)

The subject part included in the polyurea composition of the present invention includes polyetheramine, polyaspartic ester, chain extender, plasticizer, pigment and additives.

The polyether amines contained in the subject part serve to enhance the physical properties (e.g., elongation, etc.) of the coating film. Such polyether amines may have a weight average molecular weight of from 2,000 to 4,000. If the weight average molecular weight of the polyetheramine is less than 2,000, the curing rate may be accelerated or aggregation may occur. If the weight average molecular weight is more than 4,000, the curing rate may be slowed or the tensile strength of the coating film may be lowered.

The content of the polyetheramine may be 1 to 10 parts by weight based on 100 parts by weight of the main portion. If the content of the polyetheramine is less than 1 part by weight, the physical properties of the coating film may be deteriorated. If the amount of the polyetheramine is more than 10 parts by weight, the unreacted polyetheramine may remain and the synthesis yield of the polyurea may be lowered.

The polyaspartic ester contained in the subject part controls the pot life and increases the hardness of the coating film. Such polyaspartic esters may have an amine equivalent of 200 to 300 g / eq. If the amine equivalent of the polyaspartic ester is less than 200 g / eq, the curing rate may be too high to secure the pot life. When the amine equivalent is more than 300 g / eq, the curing rate may be slowed or the tensile strength .

The content of the polyaspartic ester may be 30 to 40 parts by weight based on 100 parts by weight of the main portion. When the content of the polyaspartic ester is less than 30 parts by weight, the working time may be shortened and the workability may be deteriorated during the waterproofing. If the content is more than 40 parts by weight, the pot life is excessively long or the hardness of the coating film is decreased .

The chain extender included in the main part secures the pot life by delaying the curing reaction and enhances physical properties (for example, elongation and hardness) of the coating film. Such a chain extender may be a benzene amine-based compound having an amine equivalent of 100 to 200 g / eq. If the amine equivalent of the benzene amine compound is less than 100 g / eq, the curing rate is too fast to secure the pot life and the elongation can be lowered. If the benzene amine compound has a mass ratio of more than 200 g / eq, the curing rate may be slowed.

The benzene amine compound may specifically be aniline, 4,4'-methylene-bis (3-chloro-2,6-diethylaniline), or dimethylthio-toluenediamine (DMTDA).

The content of the chain extender may be 10 to 30 parts by weight based on 100 parts by weight of the main portion. If the content of the chain extender is less than 10 parts by weight, it may be difficult to secure the pot life or the physical properties of the coating film may be deteriorated. If the content is more than 30 parts by weight, the hardness and elongation of the coating film may be lowered.

The plasticizer included in the main part controls the hardness and flexibility of the coating film. Such plasticizers may specifically be dioctyl phthalate, dioctyl terephthalate, dibutyl phthalate, dioctyl adipate, diisodecyl phthalate, or diisononyl phthalate.

The content of the plasticizer may be 10 to 20 parts by weight based on 100 parts by weight of the main portion. If the content of the plasticizer is less than 10 parts by weight, the hardness and flexibility of the coating film may be deteriorated. If the amount is more than 20 parts by weight, the hardness of the coating film may be decreased or the appearance of the coating film may be deteriorated.

The pigment included in the main portion may impart color to the coating film or enhance mechanical strength. Such pigments may specifically be carbon black, titanium dioxide, zinc oxide, talc, mica, calcium carbonate, or barium sulfate, which may be used singly or in combination.

The content of the pigment may be 1 to 5 parts by weight based on 100 parts by weight of the main portion. When the content of the pigment is less than 1 part by weight, it may be difficult to impart color to the coating film or to increase the mechanical strength. When the content of the pigment exceeds 5 parts by weight, it may be difficult to control the viscosity of the main part.

The additive included in the main part serves to enhance the physical properties of the coating film. Such additives may specifically be thickeners, leveling agents, defoamers, ultraviolet stabilizers, or adhesion promoters, which may be used alone or in combination. Such additives may be conventionally known components.

The content of the additive may be 1 to 10 parts by weight based on 100 parts by weight of the main portion. If the content of the additive is less than 1 part by weight, it may be difficult to obtain the effect of increasing the physical properties of the coating film. If the amount is more than 10 parts by weight, the appearance of the coating film may be poor or economical efficiency may be deteriorated.

b) Hardener part

The curing agent part included in the polyurea composition of the present invention includes an isocyanate compound and a polyalkylene glycol.

The isocyanate compound contained in the curing agent part serves to mediate the curing reaction. These isocyanate compounds are specifically exemplified by isophorone diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,6-hexamethylene diisocyanate, 1,5-naphthalene diisocyanate, or 4,4'-dicyclohexyl di Isocyanate, which may be used singly or in combination.

The content of the isocyanate compound may be 40 to 50 parts by weight based on 100 parts by weight of the curing agent. When the content of the isocyanate compound is less than 40 parts by weight, it is difficult to secure the pot life, and the workability may be deteriorated during waterproofing. If the content of the isocyanate compound exceeds 50 parts by weight, physical properties of the coating film may be deteriorated.

The polyalkylene glycol contained in the curing agent part serves to increase the tensile strength and adhesion of the coating film by increasing the elongation and increasing the degree of crosslinking. Such polyalkylene glycols may specifically be polyethylene glycol, polypropylene glycol, polytetramethylene glycol, or polyhexamethylene glycol, which may be used singly or in combination.

In the polyurea composition of the present invention, the main portion and the curing agent may be mixed in a weight ratio of 1: 1 to 1.2: 1. If the mixing ratio of the main portion and the curing agent portion is out of the weight ratio range, it is difficult to secure the pot life or the physical properties of the coating film may be deteriorated.

2. Waterproof construction method

The present invention provides a waterproofing method using the above-mentioned polyurea composition. Specifically, the waterproof construction method of the present invention is a combined waterproof construction method in which a waterproof sheet construction and a waterproof paint construction are mixed, and will be described with reference to FIG.

First, a first urethane paint is coated on the base material 10 to form an undercoat film 20.

The base material 10 may be a slab made of concrete which is a main material of a building.

The undercoating film 20 penetrates the base material 10 to reinforce the base material 10 and improve the adhesion of the waterproof sheet 30 adhered on the undercoating film 20. [ The first urethane paint used to form the undercoating film 20 may be a paint containing urethane resin obtained by using diphenyl methane diisocynate or toluene diisocyanate as a reactant.

Conventional methods can be applied to the method (conditions) for forming the undercoating film 20.

Next, one or more waterproof sheets 30 are attached on the undercoating film 20. Specifically, the first waterproof sheet and the second waterproof sheet are attached on the undercoating film 20 so as to be spaced apart by 1 to 5 cm. The waterproof sheet 30 may be a sheet made of asphalt. As the waterproof sheet 30 is made of asphalt, the waterproof property and economy can be improved. The thickness of the waterproof sheet 30 may be 1 to 3 mm.

Conventional methods can be applied to the method (condition) for attaching the waterproof sheet 30 on the undercoat film 20.

Next, the above-described polyurea composition 40 is applied (filled) to the edge of the waterproof sheet 30 (corner) or the joint of the waterproof sheet 30. By bonding the at least one waterproof sheet 30 by using the polyurea composition 40 described above, a high bonding force can be exhibited between the waterproof sheets 30 and the long-term durability of the joint part of the waterproof sheet 30 is increased, . In addition, the polyurea composition 40 described above can secure the workability of the waterproofing work according to the construction of the waterproof type having a usable time of 30 minutes or longer. The above-mentioned polyurea composition 40 has a tensile strength (for example, 5-10 N / mm 2), a tear strength (for example, 30-50 N / mm), an elongation -400%) and hardness (for example, Shore A hardness of 80 or more), it is possible to secure durability without using a glass fiber mesh.

The curing temperature upon application of the polyurea composition (40) after curing may be 5 ° C or higher, and the curing time may be 5 to 10 hours.

Next, a second urethane paint is coated on the waterproof sheet 30 on which the polyurea composition 40 is applied and cured at the edge or joint to form the intermediate coat film 50. The intermediate coating 50 improves the water resistance and crack resistance of the substrate 10 made of concrete. The second urethane paint used to form the intermediate coat 50 may be a paint comprising a urethane resin obtained by using toluene diisocyanate as a reactant with polyetherpolyol. Also, the second urethane paint may be an exposed type, a non-exposed type, a soft type, or a hard type paint.

Conventional methods can be applied to the method (condition) for forming the intermediate coating film 50.

Meanwhile, the waterproofing method of the present invention may further include a step of forming a top coat 60 by coating a third urethane paint on the intermediate coat 50 to improve the weatherability of the intermediate coat 50. The third urethane paint used to form the top coat 60 may be a paint comprising a urethane resin obtained using an aliphatic isocyanate as a reactant.

Conventional methods can be applied to the method (condition) for forming the top coat film 60.

Hereinafter, the present invention will be described in detail with reference to examples. However, the following examples are illustrative of the present invention, and the present invention is not limited by the following examples.

 [ Example  One]

One) Topic section  Produce

Polyester amine, polyaspartic ester, chain extender and plasticizer were put into a container and stirred at 1000 rpm for 30 minutes to prepare a mixture. A thickener and a pigment were added to the prepared mixture, and the mixture was stirred at 2,000 to 3,000 rpm for 30 minutes at high speed to prepare a subject portion. The composition of each component used in the preparation is shown in Table 1 below.

2) Hardener part  Produce

Isophorone diisocyanate and polypropylene glycol were charged into a container and stirred at 90 to 200 rpm for 4 to 8 hours to prepare a curing agent part. The composition of each component used in the preparation is shown in Table 2 below.

3) Polyurea  Composition manufacturing

The prepared subject part and the curing agent part were mixed at a weight ratio of 1: 1 to prepare a polyurea composition.

[ Comparative Example  1 to 6]

The polyurea composition was prepared in the same manner as in Example 1, except that the composition of each of the subject part and the hardener part was adjusted as shown in Tables 1 and 2 below.

ingredient Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Polyether
Amine HUNTSMANN
(Mw: 2,000-4,000) 5 28 28 28 26 10 5 Polyaspic
ester BAYER
(Equivalent: 280 g / eq,
Mw: 550) 38 30 12 26 36 56 38 Chain extender Benzene amine
(benzenamine) 29 16 22 14 6 6 29 Plasticizer Dioctyl
Terephthalate
dioctyl terephthalate 14 12 20 14 14 10 14 Pigment DUPONT
TiO ₂ 4 4 8 8 8 8 4 additive
(Thickener) Silicon dioxide
(silicon dioxide) 9 9 9 9 9 9 9 additive
(Antifoaming agent) BYK-066N One One One One One One One Total (parts by weight) 100 100 100 100 100 100 100

ingredient Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Isocyanate compound Isophorone
Diisocyanate
(isophorone diisocyanate) 45 36 42 42 30 42 55 Hexamethylene
Diisocyanate
(hexamethylene diisocyanate) - - - - 10 - - Polyalkylene
Glycol Polypropylene
Glycol
(Mw: 2,000-4,000, KPX) 55 64 58 58 60 58 45 Total (parts by weight) 100 100 100 100 100 100 100

[Experimental Example 1]

The physical properties of the prepared polyurea composition were evaluated by the following methods. The results are shown in Table 3 below.

1. Pot life: Measuring the time to reach 10,000 cPs after mixing the main part and the hardener part 1: 1 and measuring the viscosity

2. Tensile strength: After coating, cure at room temperature (25 ℃) for 7 days and measure with UTM (Universal Test Machine)

3. Tear strength: After coating, cure at room temperature (25 ℃) for 7 days and measure with UTM (Universal Test Machine).

4. Hardness: After painting, it is cured at room temperature (25 ℃) for 7 days and measured by Shore A type hardness meter

Item Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 House time (minutes) 35 18 8 25 5 40 45 Tensile strength (N / mm 2) 6.5 5.0 5.7 5.4 8.0 5.3 5.5 Tear strength (N / mm) 33.9 24.4 25.1 28.8 40.1 28 27 Elongation (%) 330 300 297 243 150 310 290 Hardness (Shore A) 86 80 80 82 90 75 77

Referring to Table 3, in Example 1 corresponding to the polyurea composition of the present invention, the pot life was maintained for 30 minutes or more and it was confirmed that the strength, elongation and hardness were high. However, in Comparative Examples 1 to 4, it was confirmed that the pot life was shorter than 30 minutes or the strength, elongation, or hardness was low. In Comparative Examples 5 and 6, the pot life was 30 minutes or more, but the strength and hardness were low.

[Production Example 1]

"KCC Spotan Hado" was painted with 50 ㎛ on the cleaned concrete floor with Hado paint (first urethane paint), and then an asphalt waterproof sheet having a thickness of about 1 mm was applied thereon. At this time, the polyurea composition prepared in Example 1 was applied for jointing the waterproof sheet to reinforce the joint. Then, "KCC SPOTAN KS1 type waterproofing agent" is coated with about 2mm with a middle paint (second urethane paint) and then cured. Then, "KCC SPOT TANKO" is painted with a top paint (third urethane paint) Respectively.

[Comparative Production Example 1]

Waterproofing was carried out in the same manner as in Production Example 1, except that a urethane waterproofing agent (KCC Spotan KS vertical surface waterproofing agent) was used instead of the polyurea composition of Example 1.

[Experimental Example 2]

The samples prepared in Preparative Example 1 and Comparative Preparative Example 1 were subjected to a warm-cold repeat test (condition: left at -20 ° C for 12 hours, left at 60 ° C for 12 hours, repeated 30 times in a single cycle) A sample is shown in Fig.

Referring to FIG. 2, it can be seen that, in the case of Production Example 1, the waterproof coating surface is maintained excellent without peeling or lifting the coating film. On the other hand, in Comparative Production Example 1, the coating film was peeled off and floating phenomenon occurred, indicating that the waterproof surface was poor.

10: substrate
20: Lower film
30: Waterproof sheet
40: Coating film formed of a polyurea composition
50: Medium Coating
60: top coat

Claims (9)

1 to 10 parts by weight of a polyetheramine, 30 to 40 parts by weight of a polyaspartic ester, 10 to 30 parts by weight of a chain extender, 10 to 20 parts by weight of a plasticizer, 1 to 5 parts by weight of a pigment and 1 to 10 parts by weight of an additive Topic section; And
40 to 50 parts by weight of an isocyanate compound and 50 to 60 parts by weight of a polyalkylene glycol,
Wherein the polyetheramine has a weight average molecular weight of from 2,000 to 4,000. delete The method according to claim 1,
Wherein the polyaspartic ester has an amine equivalent of 200 to 300 g / eq. The method according to claim 1,
Wherein the chain extender is a benzene amine compound having an amine equivalent of 100 to 200 g / eq. The method according to claim 1,
Wherein the isocyanate compound is selected from the group consisting of isophorone diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,6-hexamethylene diisocyanate, 1,5-naphthalene diisocyanate and 4,4'-dicyclohexyl diisocyanate. Lt; RTI ID = 0.0 > polyurea < / RTI > The method according to claim 1,
Wherein the polyalkylene glycol is at least one selected from the group consisting of polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and polyhexamethylene glycol. The method according to claim 1,
Wherein the mixing ratio of the main portion to the curing agent portion is 1: 1 to 1.2: 1. Coating a first urethane paint to form an undercoat film;
Attaching one or more waterproof sheets on the undercoating film;
Applying a polyurea composition according to any one of claims 1 to 7 to the edge of the waterproof sheet or the seam of the waterproof sheet; And
And coating a second urethane paint on the waterproof sheet to form an intermediate coat. The method of claim 8,
And coating a third urethane paint on the intermediate coat to form a top coat.

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