KR102289659B1 - Polyurethane composition with water expansion and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a polyurethane composition having a water-swelling expansion function. An objective of the present invention is to provide a polyurethane composition having a water-swelling expansion function, which includes a superabsorbent resin and a moisture absorbent to expand while absorbing water, so as to fill a broken area or to prevent water leakage by interfering with the flow of water, in the event of a water leak due to breakage or cracking at a joint of a waterproof sheet, thereby enabling self-repairing. The present invention provides a polyurethane composition having a water-swelling expansion function, which is prepared by mixing a main ingredient composed of polyol, isocyanate, a chain extender, a plasticizer, additives and a solvent and having a content of isocyanate group (-NCO) in an amount of 5 to 8 wt%; and a curing agent composed of polyol, a chain extender, a plasticizer, a filler, a pigment, a solvent, a catalyst, a superabsorbent polymer having a particle size of 10 μm to 200 μm, a moisture absorbent, and additives.

Description

Polyurethane composition having a water expansion function {Polyurethane composition with water expansion and manufacturing method thereof}

The present invention relates to a polyurethane composition having a water expansion function, and more particularly, by using a polyurethane composition containing a super absorbent polymer and a moisture absorbent, the joint portion of the waterproof sheet is broken or cracked, absorbing water when leakage occurs. It relates to a water-expandable polyurethane composition that can expand to fill the fracture site or prevent water leakage by obstructing the flow of water.

In order to prevent moisture from penetrating into the interior of the building, the concrete, cement mortar, or metal that makes up the roof, floor, and underground parking lot of a building is usually waterproofed with a coating film.

There are a coating waterproofing method, a sheet waterproofing method, and a composite waterproofing method as a waterproofing method for performing such a waterproofing construction, but recently, a composite waterproofing method combining a coating and a sheet waterproofing has been widely applied.

The coating film waterproofing method is a method of waterproofing construction by applying a waterproofing material alone on the upper surface of the substrate.

The sheet waterproofing method is a method of waterproofing construction by independently constructing only the waterproofing sheet on the upper part of the lower surface.

The composite waterproofing method is a method of waterproofing construction by using a coating film waterproofing and a sheet waterproofing on the upper surface of the substrate. It is manufactured to be treated as a non-woven fabric. In addition, waterproof sheets are sometimes manufactured by compounding various materials to provide various functions.

Among the coating materials used in the coating film waterproofing method or the composite waterproofing method as described above, a polyurethane coating material is commonly used.

Polyurethane materials for civil engineering and construction are capable of seamless construction, which is a characteristic of the material itself, and the construction properties that adapt well to complex structures, and chemical properties such as adhesion to the substrate, chemical resistance, durability, and sound absorption. It has excellent physical properties such as , dimensional stability and, in particular, excellent elongation rate, so it has excellent followability to cracks in the base, so its demand as a waterproofing material for interior and exterior walls and floors of buildings is increasing.

However, even if the polyurethane material having the above excellent properties is exposed to water due to cracks in the base surface or if a breakage occurs in the waterproofing coating made of polyurethane, it cannot be repaired by itself in the initial stage, so water leakage may occur. The downside is that it can.

In addition, there is a conventional polyurethane composition containing a water-repellent agent or an absorbent, but there is a problem that it does not provide satisfactory repair and waterproofing performance because it does not expand quickly and sufficiently when it comes into contact with water due to water leakage at the part where the fracture proceeds. .

Korean Patent Registration Publication No. 10-1881318 (Registered on 2018.07.18.) Korean Patent Registration Publication No. 10-0988201 (Registered on October 11, 2010) Korean Patent Registration Publication No. 10-0552454 (Registered on Feb. 8, 2006) Korean Patent Registration Publication No. 10-0457861 (Registered on 11.10. 2004.)

An object of the present invention to solve the above problems is to expand while absorbing water when a water leak occurs due to breakage or cracking at the joint of the waterproof sheet, including a superabsorbent polymer and a moisture absorbent, to fill the breakage or to obstruct the flow of water. An object of the present invention is to provide a polyurethane composition having a water expansion function that can be repaired by itself by preventing water leakage.

The present invention, which achieves the above object and performs the task for eliminating the conventional drawbacks, is composed of a polyol, an isocyanate, a chain extender, a plasticizer, an additive and a solvent, and an isocyanate group (-NCO) content of 5 to 8 wt% a subject consisting of;

Polyol, a chain extender, a plasticizer, a filler, a pigment, a solvent, a catalyst, a superabsorbent polymer having a particle size of 10 μm to 200 μm, a curing agent consisting of a moisture absorbent, and an additive; Poly with water expansion function, characterized in that it is prepared by mixing This is achieved by providing a urethane composition.

In a preferred embodiment, it is characterized in that the main agent and the curing agent are mixed in a ratio of 1:3 to 1:5 by weight.

In a preferred embodiment, the desiccant is a zeolite-based or liquid desiccant and adsorbs moisture in the curing agent to prevent the moisture in the curing agent from reacting with the NCO of the main agent when the main agent reacts with the curing agent. do it with

In a preferred embodiment, the superabsorbent polymer is characterized in that 4 to 50 wt% of the curing agent is included.

In a preferred embodiment, the superabsorbent polymer contains 0.01 to 0.5 parts by weight of sodium bicarbonate, sodium carbonate based on 100 parts by weight of an acrylic acid-based monomer having an acid group and at least a portion of the acid group neutralized. At least one blowing agent selected from , potassium bicarbonate, potassium carbonate, calcium bicarbonate, calcium bicarbonate, magnesium bicarbonate and magnesium carbonate;

0.001 to 0.5 parts by weight of sodium dodecyl sulfate, sodium stearate, ammonium lauryl sulfate, sodium lauryl ethersulfate and sodium myreth sulfate myreth sulfate) at least one surfactant;

0.01 to 0.5 parts by weight of an internal crosslinking agent; and

After polymerizing a monomer composition containing 0.01 to 1.0 parts by weight of a polymerization initiator to make a hydrogel polymer, mixing with a basic aqueous solution, and pulverizing to obtain a particle size of 10 μm to 200 μm, and surface crosslinking the dried base resin. characterized in use.

In a preferred embodiment, the basic aqueous solution is at least one selected from potassium hydroxide (KOH), potassium carbonate (K2CO3) and sodium hydroxide (NaOH) having a concentration of 0.1 to 10 M and 5 to 20 parts by weight based on 100 parts by weight of the hydrogel polymer. characterized by mixing.

In a preferred embodiment, the polyol uses at least one selected from polyether polyol, polyester polyol, and polycarbonate polyol having a number average molecular weight of 500 to 10,000, and OH in polyol The group is in the form of Diol or Triol, and is characterized in that it contains 51 to 75 wt% of the main ingredient and 15 to 30 wt% in the curing agent.

In a preferred embodiment, the chain extender formulated in the subject matter has a number average molecular weight of about 50 to 200 EG (Ethylene Glycol), 1,2-PG (1,2-Propylene Glycol), 1,3-BG (1 ,3-Butandiol), 1,4-BG (1,4-Butandiol), NPG (Neopentyl glycol), DEG (Diethylene Glycol), MPD (3-Methyl-1,5-Pentandiol), 1,6-HD ( 1,6-Hexandiol) and TMP (Trimethylol Propane) is used, and it is characterized in that it contains 2 to 5 wt% of the subject matter.

In a preferred embodiment, the chain extender composition in the curing agent has a number average molecular weight of about 50 to 300 DETDA (Diethyltoluenediamine), 4,4'-methylenebis (N-sec-butylaniline), DMTDA (Dimethyl thiotoluenediamine), IPDA ( Isophoronediamine), HDA (Hexan diamine), Hydra zine, EDA (Ethylenedi amine), CHDA (1,4-ciclohexan diamine), TDA (2,4-Toluylene diamine), Diethyl toluene diamine, 4,4-Diamino dicyclohexyl methane, Any one or more selected from PDA (Propylene diamine) and BDA (Butylene diamine) is used, and 0.5 to 2 wt% is included in the curing agent.

In a preferred embodiment, the isocyanate is characterized in that any one or more selected from TDI, MDI, IPDI, H-MDI, and Isocyanate trimer is used, and 10 to 30 wt% of the isocyanate is included in the main ingredient.

In a preferred embodiment, the catalyst is characterized in that one or more selected from bismuth, tertiary amine, zinc, oxyl acid, benzoic acid, and phosphoric acid is used, and 0.5 to 2 wt% of the curing agent is included.

The polyurethane composition having a water expansion function according to the present invention having the above characteristics includes a superabsorbent resin and a desiccant. It has the effect of controlling side reactions and foaming caused by moisture.

In addition, the polyurethane composition produced in the present invention is usually applied to the joint portion of the waterproof sheet of the non-exposed polyurethane waterproof structure and used as a waterproof coating film sealant, and then the waterproof sheet joint by repeating contraction and expansion due to seasonal change or daily temperature difference or load load. When a part breaks or cracks and leakage occurs, the superabsorbent polymer having a particle size of 10 μm to 200 μm is densely distributed in the polyurethane composition and forms a network structure while absorbing moisture and uniformly expanding the polyurethane. It has the effect of providing excellent waterproof performance.

The present invention is a useful invention having various effects as described above, and its use is highly expected in industry.

1 is a cross-sectional view of a composite waterproof structure in which a seal material made of a water-expandable polyurethane composition according to an embodiment of the present invention is constructed.

Hereinafter, the configuration and operation of the embodiment of the present invention will be described in detail in connection with the accompanying drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

The polyurethane composition having a water-expandable function according to the present invention is a polyurethane composition containing a superabsorbent resin and a moisture absorbent, which is applied to the joint of a waterproof sheet of a non-exposed polyurethane waterproof structure and used as a waterproof coating film sealant, and then seasonal changes or daily temperature difference or Under the load, the surface (upper cement protection mortar or lower slab surface) contracts and expands repeatedly to break or crack at the joint of the waterproof sheet. It is a composition that provides excellent waterproof performance by uniformly expanding polyurethane while absorbing moisture while forming a network structure while densely distributed within the polyurethane composition.

The polyurethane composition having a water expandability function according to an embodiment of the present invention,

a main agent comprising a polyol, an isocyanate, a chain extender, a plasticizer, an additive and a solvent;

A polyol, a chain extender, a plasticizer, a filler, a pigment, a solvent, a catalyst, a super absorbent polymer, a moisture absorbent, and a curing agent comprising an additive; is a two-part composition prepared by mixing.

The main agent and the curing agent are used in a mixture of 1:3 to 1:5 based on the weight ratio.

The content of the isocyanate group (-NCO) of the subject may be 5 to 8 wt%.

The polyol constituting the subject matter of the present invention is a material that provides a hydroxyl group (-OH) for polyurethane polymerization, and a polyether polyol having a number average molecular weight of 500 to 10,000, a polyester polyol, At least one selected from polycarbonate polyols is used.

At this time, polyether polyol (polyether polyol), polyester polyol (polyester polyol), and polycarbonate polyol (polycarbonate polyol) uses the OH group in the form of Diol or Triol.

Such polyols are representative of those commercially available.

The polyol is contained in an amount of 51 to 75 wt % in the subject matter. The reason for limiting the added content as described above is that when less than 50 wt% is added, durability is deteriorated, and when more than 75 wt% is added, viscosity is increased and hardness is too low.

Isocyanate constituting the main material is a material that provides an isocyanate group (-NCO) for polyurethane polymerization, and any one or more selected from TDI, MDI, IPDI, H-MDI, and Isocyanate trimer is used. Such isocyanates are representative of those commercially available.

Isocyanate is included in 10 to 30 wt% in the subject matter. The reason for limiting the added content in this way is that when less than 10 wt% is added, the hardness is low and durability is lowered, and when more than 30 wt% is added, there are problems in that the hardness is high and the elongation is lowered.

At this time, the content of the isocyanate group (-NCO) in the main ingredient is formulated to contain 5 to 8 wt%. The reason for limiting the added content in this way is that when less than 5 wt% is added, the hardness is low and durability is lowered.

The chain extender constituting the main subject is a constituent element that controls the polymerization reaction rate between the hydroxyl group (-OH) and the isocyanate group (-NCO) during the polyurethane polymerization reaction. Depending on the content or type, the polyurethane synthesis time and physical properties this changes Therefore, it is a compositional element that plays a very important role in the painting work after mixing the main agent and the curing agent according to the present invention prepared in a two-component type in the field.

In the subject, chain extenders are EG (Ethylene Glycol), 1,2-PG (1,2-Propylene Glycol), 1,3-BG (1,3-Butandiol), 1, 4-BG(1,4-Butandiol), NPG(Neopentyl glycol), DEG(Diethylene Glycol), MPD(3-Methyl-1,5-Pentandiol), 1,6-HD(1,6-Hexandiol), TMP (Trimethylol Propane) use any one or more selected from. These chain extenders are representative of those commercially available.

The chain extender is formulated to contain 2 to 5 wt% of the subject matter. The reason for limiting the content is that when less than 2 wt% is added, the bonding force between molecules is low and easily damaged. because there is

The plasticizer constituting the subject is a phthalate-based plasticizer, an aromatic, non-aromatic high-boiling solvent with a boiling point of 100°C or higher, bis(2-ethylhexyl) terephthalate, a reaction product of disubstitutedcarbomonocycle, alkyl(C=1~3)alkanol(C=4~6) ) and alkanol (C=3~5), any one or more selected from the group is used. Such plasticizers are representative of those commercially used.

The plasticizer is used for the purpose of reducing the viscosity or plasticity of the waterproofing material, and is included in 2 to 10 wt% of the main material. The reason for limiting the added content as described above is that when less than 2 wt% is added, the flexibility of the waterproofing material is lowered, and the viscosity of the main material is increased, making it difficult to handle. This is because there is a problem in that it is easily damaged or the plasticizer is implemented.

Additives constituting the main subject use any one or more selected from antioxidants and catalysts.

Additives are included in an amount of 0.01 to 0.5 wt% of the main ingredient. The reason for limiting the amount of addition is that when less than 0.01 wt% is added, the reactivity is lowered when synthesizing the subject, and the color is discolored. because there is

The solvent constituting the subject is DMC, mineral oil, BTX-based, ketone-based, or acetate-based solvents with a boiling point of 50 to 150 ℃ or more selected from among them. Such solvents are representative of those commercially used.

The solvent is contained in 0.02 ~ 4wt% in the main material and is used for the purpose of adjusting the viscosity. The reason for limiting the added content as described above is that when less than 0.02 wt% is added, there is a problem in that the viscosity increases, and when more than 4 wt% is added, there is a problem in that the viscosity is lowered.

The polyol constituting the curing agent of the present invention is a material that provides a hydroxyl group (-OH) for the polyurethane polymerization reaction, and a polyether polyol having a number average molecular weight of 500 to 10,000, a polyester polyol, At least one selected from polycarbonate polyols is used. Such polyols are representative of those commercially available.

The polyol is included in 15 to 30 wt% of the curing agent. The reason for limiting the added content as described above is that when less than 15 wt% is added, durability is lowered and elongation is lowered, and when added more than 30 wt%, viscosity is lowered and hardness is lowered.

The chain extender constituting the curing agent improves the polymerization rate during the polyurethane polymerization reaction, and not only improves the bonding force between molecules, but also plays a role in forming macromolecules even at room temperature reaction, thereby contributing to the improvement of the durability of the waterproofing material as a whole. The curing time and physical properties of polyurethane vary depending on the content or type of chain extender. Therefore, it is a compositional element that plays a very important role in the painting work after mixing the main agent and the curing agent according to the present invention prepared in a two-component type in the field.

The chain extender in the curing agent is DETDA (Diethyltoluenediamine), 4,4'-methylenebis (N-sec-butylaniline), DMTDA (Dimethylthiotoluenediamine), IPDA (Isophoronediamine), HDA (Hexan diamine), Hydra zine, EDA (Ethylene diamine), CHDA (1,4-ciclohexan diamine), TDA (2,4-Toluylene diamine), Diethyltoluene diamine, 4,4-Diamino dicyclohexyl methane, PDA (Propylene diamine), BDA (Butylene) diamine), any one or more selected from among them is used. Such chain extenders are representative of those commercially used.

The chain extender is included in 0.5 to 2 wt% of the curing agent. The reason for limiting the amount of addition in this way is that when less than 0.5 wt% is added, there is a problem that intermolecular bonding is weakened, and when more than 2 wt% is added, intermolecular bonding is increased and the reactivity is too fast, so there is a problem in handling. am.

The plasticizer constituting the curing agent is a phthalate-based plasticizer, an aromatic, non-aromatic high-boiling solvent with a boiling point of 100°C or higher, bis(2-ethylhexyl) terephthalate, a reaction product of disubstitutedcarbomonocycle, alkyl(C=1~3)alkanol(C=4~6) ) and alkanol (C=3~5), any one or more selected from the group is used. Such plasticizers are representative of those commercially used.

The plasticizer is included in 2 to 10 wt% of the curing agent. The reason for limiting the content is that when less than 2 wt% is added, the flexibility of the waterproofing material is lowered and the viscosity of the curing agent can be increased. Because there are possible problems.

The filler constituting the curing agent provides mechanical performance and durability of the prepared polyurethane composition having a water expandability function, and any one or more selected from calcium carbonate, silica, talc, and barium sulfate is used.

The filler (Filler) is included in 5 ~ 51wt% of the curing agent. The reason for limiting the content is that when less than 5 wt% is added, hardness and strength are low, so that it is easily damaged when using a waterproofing material, and when added more than 51 wt%, hardness is high and elongation is lowered. Because.

The pigment constituting the curing agent provides the color of the polyurethane composition having a water-expandable function, and a pigment that provides the required color may be used. The pigment may be used without particular limitation as long as it is commonly used in the art. For example, one or more selected from the group consisting of iron oxide, iron hydroxide, chromium oxide, barium sulfate, barium carbonate, titanium oxide, titanium dioxide, manganese dioxide, titanium dioxide, zirconium silicate, carbon black and sodium aluminosilicate may be used. .

The pigment is contained in an amount of 1 to 4 wt% in the curing agent. The reason for limiting the added content in this way is that when less than 1 wt% is added, there is a problem that coloring is not expressed, and when more than 4 wt% is added, the price is high, and there is a problem in that handling is not easy due to strong adhesion. .

The catalyst constituting the curing agent is a composition element used to control the rate of the polyurethane polymerization reaction, and any one or more selected from bismuth, tertiary amine, zinc, oxyl acid, benzoic acid, and phosphoric acid is used.

The catalyst is included in 0.5 to 2 wt% in the curing agent. The reason for limiting the amount of addition in this way is that when less than 0.5 wt% is added, the curing speed of the main agent and curing agent is slowed, resulting in poor workability, and when added more than 2 wt%, the reaction rate is too fast and there are problems in construction.

As a solvent constituting the curing agent, any one or more selected from among those having a boiling point of 50 to 150 °C, such as DMC, mineral oil, BTX, ketone, and acetate, is used. Such solvents are representative of those commercially used.

The solvent is formulated to contain 5 to 10 wt% of the curing agent. The reason for limiting the addition content in this way is that when less than 5 wt% is added, the viscosity increases and there is a problem in construction. am.

The superabsorbent polymer constituting the curing agent absorbs water and expands when water accumulates at the fracture site of the seam in the polyurethane composition having a water-expandable function according to the present invention, thereby providing waterproof performance while filling the cracked area.

The superabsorbent polymer is included in an amount of 4 to 50 wt% in the curing agent. The reason for limiting the content is that when less than 4 wt% is added, the water absorption rate is slow and volume expansion is small, and when more than 50 wt% is added, volume expansion occurs too much and durability is reduced. because there is

In addition, as the superabsorbent polymer, a particle size of 10 μm to 200 μm is used. If the particle size is larger than 200 μm, moisture transfer between particles is not smooth due to urethane between particles, resulting in asymmetric expansion, which may reduce waterproof performance. If the particle size is smaller than 10 μm, the viscosity of the curing agent increases, so that it is difficult to handle during construction.

The superabsorbent polymer has an acidic group and 0.01 to 0.5 parts by weight of sodium bicarbonate, sodium carbonate, potassium bicarbonate based on 100 parts by weight of an acrylic acid-based monomer in which at least a portion of the acidic group is neutralized. ), potassium carbonate (potassium carbonate), calcium bicarbonate (calcium bicarbonate), calcium carbonate (calcium bicarbonate), magnesium bicarbonate (magnesium bicarbonate) and magnesium carbonate (magnesium carbonate) at least one blowing agent selected from;

0.001 to 0.5 parts by weight of sodium dodecyl sulfate, sodium stearate, ammonium lauryl sulfate, sodium lauryl ethersulfate and sodium myreth sulfate myreth sulfate) at least one surfactant;

0.01 to 0.5 parts by weight of an internal crosslinking agent; and

It is prepared by polymerizing a monomer composition containing 0.01 to 1.0 parts by weight of a polymerization initiator to make a hydrogel polymer, mixing it with a basic aqueous solution, pulverizing it to obtain a particle size of 10 μm to 200 μm, and surface-crosslinking the dried base resin.

The foaming agent plays a role in increasing the surface area by forming pores in the hydrogel polymer by foaming during the polymerization reaction. It is advantageous for distribution and storage because the density is not small.

The surfactant induces a uniform distribution of the components in the monomer composition and maintains the shape of the bubbles formed by the foaming agent, and at the same time serves to uniformly distribute the bubbles over the entire area of the polymer. will do

When the crosslinking agent has the above content, the monomer composition is smoothly crosslinked to react with the hydrogel polymer.

When the polymerization initiator has the above content, a smooth polymer polymerization reaction occurs. The polymerization initiator is not particularly limited as long as it is generally used in the production of the super absorbent polymer.

The basic aqueous solution is 5 to 20 parts by weight based on 100 parts by weight of the hydrogel polymer and at least one selected from potassium hydroxide (KOH), potassium carbonate (K2CO3) and sodium hydroxide (NaOH) having a concentration of 0.1 to 10 M is mixed. After mixing, it is pulverized to a particle size of 10 μm to 200 μm. The reason for limiting the size is that, if the particle size is larger than 200 μm, moisture transfer between particles is not smooth due to urethane between particles, resulting in asymmetric expansion, which may reduce waterproofing performance. The viscosity of the curing agent increases, so there is a problem in handling during construction.

When the base resin is surface cross-linked, a surface cross-linked layer is formed. Since the surface crosslinking agent is applied to the surface of the superabsorbent polymer particles, the surface crosslinking reaction occurs on the surface of the superabsorbent polymer particles, which improves crosslinking properties on the surface of the particles without substantially affecting the inside of the particles. Therefore, the surface cross-linked super absorbent polymer particles have a higher degree of cross-linking near the surface than inside.

As a desiccant constituting the curing agent, a zeolite-based or liquid desiccant is used. The desiccant is used for the purpose of improving the bonding strength of the waterproofing material by adsorbing moisture in the curing agent and preventing the NCO group of the main agent from reacting with the moisture in the curing agent during the reaction of the main agent/curing agent.

As such, the desiccant removes moisture from the curing agent to prevent side reactions during the polyurethane reaction, and controls the foaming phenomenon caused by moisture to improve the durability in the urethane coating film formation process such as tensile strength, elongation, and hardness.

The desiccant is included in 1 to 3 wt% of the curing agent. The reason for limiting the amount of addition in this way is that when less than 1 wt% is added, there is a problem of foaming of the waterproofing material due to insufficient moisture adsorption in the curing agent, and when added more than 3 wt%, there is a problem in construction because the thixotropic property is too high. .

As an additive constituting the curing agent, any one or more selected from a flow control agent, an antioxidant, and an anti-settling agent is used.

Additives are contained in an amount of 0.05 to 1 wt% in the curing agent. The reason for limiting the addition content as described above is that when less than 0.05 wt% is added, there are problems such as oxidation of the resin, reduced fluidity, and precipitation, and when more than 1 wt% is added, there are problems such as migration of the additive and a different color.

Hereinafter are preferred embodiments of the present invention.

In the following example, in order to check the volume change according to the content of the superabsorbent polymer contained in the curing agent of the present invention, a urethane sheet is prepared by mixing the subject material having the following content and the curing agent in a ratio of 1: 4 and then immersed in a water tank and immersed in a water tank The volume change over time was compared and tested.

In the following examples, after the composition of the super absorbent polymer content of 20wt% contained in the curing agent as a reference content, a certain amount was increased or decreased as described in Tables 1 and 2, and an experiment was performed. During the experiment, the filler among the curing agents was tested based on the composition increased or decreased by interlocking according to the increase or decrease in the content of 20 wt% of the superabsorbent polymer based on the content of 35 wt%.

In each Example experiment, the composition of the reference subject was polyol (diol molecular weight = 2000) 34.26 wt%, polyol (triol molecular weight = 3000) 34.26 wt%, isocyanate (TDI) 24.37 wt%, chain extender (1,3-BG) 3.09wt%, plasticizer 3.00wt%, additive (antioxidant) 0.02wt%, solvent 1.00wt%. where NCO wt% = 6.0.

In addition, the composition of the standard curing agent is polyol (diol molecular weight = 3000) 19.99 wt%, polyol (triol molecular weight = 5000) 4.50 wt%, chain extender (DMTDA) 1.47 wt%, plasticizer 7.00 wt%, filler (Filler) 35.00 wt% , pigment 1.50wt%, solvent 7.00wt%, catalyst 1.44wt%, super absorbent polymer 20.00wt%, moisture absorbent 2.00wt%, additive (precipitation inhibitor) 0.10wt%.

(Example 1)

The volume change according to the immersion time of the water tank when 0 to 10 wt% of the superabsorbent polymer was included in 100 wt% of the curing agent was compared.

The results are shown in Table 1.

[Table 1]

Comparative experiment when 0 to 10 wt% of superabsorbent polymer is included in 100wt% of curing agent

Example 2)

The volume change according to the immersion time of the water bath when 30 to 50 wt% of the superabsorbent polymer was included in 100 wt% of the curing agent was compared.

The results are shown in Table 2.

[Table 2]

Comparative test when 30 to 50 wt% of superabsorbent polymer is included among 100wt% of curing agent

As in Examples 1 and 2, it can be seen that the super absorbent polymer according to the present invention has the best effect when 4 to 50 wt% of 100 wt% of the curing agent is included.

Specifically, as shown in Table 1, when the superabsorbent polymer contained in the polyurethane composition having a water expansibility function according to the present invention contains 4 to 20 wt%, it can be seen that the water expansion effect appears over several days. could

It can be seen that it is preferable to prepare a polyurethane composition having such a numerical section and apply it to a place where there is little moisture or a rapid reaction should not occur even if leakage occurs when a polyurethane composition is prepared and applied to the joint of the waterproof sheet.

In addition, as shown in Table 2, the superabsorbent polymer contained in the polyurethane composition having a water expansibility function according to the present invention exhibits a rapid water expansion effect over several minutes when the content is 30 to 50 wt%. could

It can be seen that when a polyurethane composition having such a numerical section is prepared and applied to the joint of the waterproof sheet, it is preferable to apply it to a place where there is a lot of moisture or a rapid repair is required when a water leak occurs.

1 is a cross-sectional view of a composite waterproof structure in which a seal material made of a water-expandable polyurethane composition according to an embodiment of the present invention is constructed.

A composite waterproof structure applied as a sealant with a water-expandable polyurethane composition in which the above-described subject and a curing agent are mixed will be described below.

As shown, the structure to which the polyurethane composition having a water expansion function according to the present invention is applied according to one embodiment has the following process.

The primer layer (2) is applied over the entire surface of the base concrete slab layer (1) of the concrete building and is formed.

Thereafter, a waterproof coating layer 3 is applied to the upper surface of the primer layer 2 and the parapet end side, and a waterproof anti-corrosion sheet 4 is installed on the top surface in a butt joint manner.

At this time, the water-expandable polyurethane composition sealing material 5 according to the present invention is applied to the butt joint portion between the waterproof anti-corrosion sheets and the parapet end side to fix the waterproof anti-corrosion sheet.

In addition, the elastic member layer 6 is additionally formed in the longitudinal direction on the upper surface of the butt joint between the waterproof anti-corrosion sheets to which the water-expandable polyurethane composition sealing material 5 is applied.

Thereafter, the high-viscosity polyurethane seal composition 7 is applied to the water-expandable polyurethane composition sealing material 5 and the expansion and contraction member layer 6 constructed on the upper surface of the butt joint between the anti-corrosion sheets, and is used as an anti-corrosion waterproof adhesive.

In addition, a high-viscosity polyurethane seal composition (7) is also applied to the end portion of the parapet in the same manner, and is used as an anti-corrosion and waterproof adhesive.

After that, the pressed concrete layer 8 is constructed on the upper part.

Reference numeral 9 in the drawings denotes a parapet end.

The present invention is not limited to the specific preferred embodiments described above, and without departing from the gist of the present invention claimed in the claims, anyone with ordinary skill in the art to which the invention pertains can implement various modifications Of course, such modifications are intended to be within the scope of the claims.

(1): slab layer (2): primer layer
(3): waterproof coating layer (4): waterproof anti-rust sheet
(5): water-expandable polyurethane composition sealing material (6): elastic member layer
(7): High-viscosity polyurethane seal composition (8): Pressed concrete layer
(9): Parapet end

Claims (11)

In the polyurethane composition having a water expansion function that can repair itself by absorbing water when a water leak occurs at the joint of the waterproof sheet,
a main agent composed of polyols, isocyanates, chain extenders, plasticizers, additives and solvents and having an isocyanate group (-NCO) content of 5 to 8 wt%;
Polyol, a chain extender, a plasticizer, a filler, a pigment, a solvent, a catalyst, a superabsorbent polymer having a particle size of 10 µm to 200 µm, a curing agent consisting of a moisture absorbent, and an additive;
The desiccant is a zeolite-based or liquid desiccant, and is composed of 1 to 3 wt% in the curing agent to adsorb moisture in the curing agent to prevent the moisture in the curing agent from reacting with the NCO of the main agent when the main agent and the curing agent react,
The superabsorbent polymer has an acidic group and is based on 100 parts by weight of an acrylic acid-based monomer in which at least a portion of the acidic group is neutralized, from 0.01 to 0.5 parts by weight of sodium bicarbonate, sodium carbonate, potassium bicarbonate ( at least one blowing agent selected from potassium bicarbonate), potassium carbonate, calcium bicarbonate, calcium bicarbonate, magnesium bicarbonate and magnesium carbonate; 0.001 to 0.5 parts by weight of sodium dodecyl sulfate, sodium stearate, ammonium lauryl sulfate, sodium lauryl ethersulfate and sodium myreth sulfate at least one surfactant selected from myreth sulfate); 0.01 to 0.5 parts by weight of an internal crosslinking agent; and 0.01 to 1.0 parts by weight of a polymerization initiator to make a hydrogel polymer, then mix with a basic aqueous solution and pulverize to obtain a particle size of 10 μm to 200 μm, and surface cross-link the dried base resin. , Polyurethane composition having a water expansion function, characterized in that contained in 4 ~ 50wt% of the curing agent.
The method according to claim 1,
The polyurethane composition having a water expansion function, characterized in that the main agent and the curing agent are mixed in a weight ratio of 1:3 to 1:5.
delete delete delete The method according to claim 1,
The basic aqueous solution is 5 to 20 parts by weight based on 100 parts by weight of the hydrogel polymer and at least one selected from potassium hydroxide (KOH), potassium carbonate (K2CO3) and sodium hydroxide (NaOH) having a concentration of 0.1 to 10 M is mixed. A polyurethane composition having a water expansion function.
The method according to claim 1,
The polyol is at least one selected from polyether polyol, polyester polyol, and polycarbonate polyol having a number average molecular weight of 500 to 10,000,
The polyol uses that in which the OH group is in the form of Diol or Triol,
Polyurethane composition having a water expansion function, characterized in that the OH group in the polyol is in the form of Diol or Triol, and contains 51 to 75wt% in the main material, and 15 to 30wt% in the curing agent.
The method according to claim 1,
The chain extender formulated in the above subject matter has a number average molecular weight of about 50 to 200 EG (Ethylene Glycol), 1,2-PG (1,2-Propylene Glycol), 1,3-BG (1,3-Butandiol) , 1,4-BG (1,4-Butandiol), NPG (Neopentyl glycol), DEG (Diethylene Glycol), MPD (3-Methyl-1,5-Pentandiol), 1,6-HD (1,6-Hexandiol) ), using any one or more selected from Trimethylol Propane (TMP), and a polyurethane composition having a water expansion function, characterized in that it contains 2 to 5 wt% in the main ingredient.
The method according to claim 1,
The chain extender composition in the curing agent has a number average molecular weight of about 50 to 300 DETDA (Diethyltoluenediamine), 4,4'-methylenebis (N-sec-butylaniline), DMTDA (Dimethylthiotoluenediamine), IPDA (Isophoronediamine), HDA (Hexan) diamine), Hydra zine, EDA (Ethylene diamine), CHDA (1,4-ciclohexan diamine), TDA (2,4-Toluylene diamine), Diethyltoluene diamine, 4,4-Diamino dicyclohexyl methane, PDA (Pro pylene diamine), Using any one or more selected from BDA (Butylene diamine),
Polyurethane composition having a water expansion function, characterized in that contained in 0.5 ~ 2wt% of the curing agent.
The method according to claim 1,
The isocyanate is TDI, MDI, IPDI, H-MDI, using any one or more selected from the isocyanate trimer, polyurethane composition having a water expansion function, characterized in that contained in 10 ~ 30 wt% in the main ingredient.
The method according to claim 1,
The catalyst uses any one or more selected from bismuth, tertiary amine, zinc, oxyl acid, benzoic acid, and phosphoric acid, and the polyurethane composition having a water expansion function, characterized in that 0.5 to 2 wt% is included in the curing agent.

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