KR20040014027A - The construction materials and method manufacture mortar of drainage firing Urethan - Google Patents

Abstract

PURPOSE: Provided is a method for making a urethane foam water-proof mortar having strong elasticity, wear resistance, chemical resistance and anti-aging property, suitable for the construction of a concrete structure. CONSTITUTION: The method comprises the steps of: polymerizing 50 wt% of methylene diisocyanate(MDI) with 50 wt% of a polyol having a molecular weight of 2000-4000 g/mol and controlling the reactivity to the amount of free NCO groups of 3.5-4.0 so as to obtain a prepolymer urethane formulation A; mixing 80 wt% of a polybasic polyol mixture, 3.0 wt% of amines, 10 wt% of a pigment and 7.0 wt% of additives to obtain a urethane formulation B; mixing the urethane formulation A with the urethane formulation B in the ratio of 1:1 to form composite urethane; and mixing 50 wt% of the composite urethane, 30 wt% of sand and 20 wt% of CO2.

Description

The construction materials and method manufacture mortar of drainage firing Urethan}

The present invention relates to a urethane waterproof mortar manufacturing method having a strong elasticity, wear resistance, chemical resistance, aging resistance, more specifically, waterproof mortar or urethane resin made of urethane resin and sand, sand, glass fiber rods, carbon fiber rods, etc. The present invention relates to a method for manufacturing a waterproofing mortar and a building member, which is simple and easy to construct and perfect for waterproofing, by manufacturing a waterproof mortar made of cracks to be used as a waterproofing agent for a cracked building structure or a new building.

Conventionally, when repairing due to cracks in the concrete building structure being used, mortar mixed with cement, sand, and water was used or cement paste mixed with cement and water was used. Although it is possible to use it, but it is not possible to waterproof the cracked part or the slab, and there is a problem that it is difficult to join the existing structure.In the case of cement paste, filling the cracked part may have some effect. However, this also had a problem in that the joint cracks due to the difference in strength after curing of the existing structure and cement paste.

In addition to the above method, the cracks may be repaired by injecting synthetic resin, but this may be a perfect joint at the beginning of repair work, but it may be weak in the temperature of the outside air, and thus, the viscosity may have to be rebuilt over time.

In addition, another existing example is a waterproof sheet for preventing ground subsidence during road construction to obtain a polyurethane sheet by recycling polyurethane foam, which is an industrial waste, and to form a rubberized asphalt layer by adhering rubberized asphalt to the sheet. Although there was a polyurethane waterproof laminated sheet in which the mold film was laminated thereon, such a conventional polyurethane waterproof laminated sheet had a viscous property after a long period of time due to the change of state according to the temperature change of asphalt, that is, the viscosity, so that the cured and cured asphalt In the process of repeated expansion and contraction due to temperature change, the layer generates gaps between the layers of polyethylene films which are extremely poor in adhesion, and the polyethylene films of thin films are mixed with stones or foreign substances during mortality during careless work before construction. Surface damage can easily occur. Lowers.

In addition, such a waterproof sheet must be mortar-coated on top of the sheet after bonding. It is easy to mortar the floor during waterproofing, but when waterproofing the wall, it is necessary to stack bricks or form the mold due to the slippery surface of poriethiene. Such construction work was extremely troublesome.

In view of the above problems, the present invention provides a urethane waterproofing mortar by mixing urethane resin with sand and CO ₂ gas, thereby easily and easily constructing and repairing a concrete structure, and waterproofing and minimizing maintenance and management costs. It is for the purpose of making it possible

The present invention having the above object can be applied by spraying a composite urethane resin, sand, etc. with a nozzle between a glass fiber rod or a carbon fiber rod, or spraying a waterproof mortar made of urethane resin and sand with a nozzle. It is characterized by providing a urethane waterproof mortar or building member having a strong elasticity, wear resistance, chemical resistance, aging resistance by filling in the building member.

1 is a process for producing a waterproof mortar of the present invention.

Figure 2a, 2b is a perspective view of the building member produced by the waterproof mortar of the present invention.

Figure 3 is a cross-sectional view of the building member produced by the waterproof mortar of the present invention.

Figure 4a, 4b is an exemplary view illustrating a waterproof structure constructed of waterproof mortar of the present invention.

5 is a configuration of a spray nozzle for spraying foaming mortar of the present invention.

<Description of the symbols for the main parts of the drawings>

10: building member 11: panel

12: Block 13: glass fiber rod

20,20 ': Tank 30: Electric Heater

40: delivery pump 50: injection nozzle

60: Hopper 70: solvent pump

80: waterproof mortar 90: CO ₂ tank

Hereinafter, the manufacturing method of the present invention will be described in detail.

50% by weight of methylene diisocyanate (hereinafter referred to as "MDI") is mixed with 50% by weight of polyol having a molecular weight of 2,000 to 4,000 g / mol to stir the reaction degree (hereinafter referred to as "FREE NCO") to 3.5 to 4.0. Prepolymer urethane (hereinafter referred to as "urethane A") made by adjusting,

Base resin mixed with 80% by weight of polybasic polyol mixture, 3.0% by weight of amines, 10% by weight of pigment, and 7.0% by weight of an additive mixed with an antifoaming agent, a surface hardening agent, a self-leveling agent and a sunscreen agent (hereinafter referred to as "urethane B") Latching), and a process for producing a composite urethane mixing the urethane A and B agent in a 1: 1 ratio;

50% by weight of the prepared composite urethane, sand 30% by weight, CO ₂ 20% by weight, characterized in that the urethane foam waterproof mortar manufacturing method by mixing.

In addition, another embodiment of the present invention, characterized in that the waterproof mortar prepared by mixing 80% by weight of the mixed composite urethane and 20% by weight of CO ₂ .

Looking at the structure of the building member molded by the waterproof mortar of the present invention manufactured as described above are as follows.

50% by weight of MDI and 50% by weight of polyol having a molecular weight of 2,000 to 4,000 g / mol to adjust the NCO to 3.5 to 4.0, 80% by weight of polybasic polyol mixture, 3.0% by weight of amines, lig Panel 11 or block (12) by spraying mixed urethane B mixed with 10% by weight, 7.0% by weight of additives with 50% by weight of mixed urethane 1, 30% by weight of sand and 20% by weight of CO _2. Characterized in that the building member 10 formed.

The additives to be mixed during the preparation of the urethane B agent is an equally 1: 1 mixing of an antifoaming agent, a surface strengthening agent, a self-leveling agent, and a sunscreen agent, and mixes 7.0% by weight of the additive with respect to the total weight of the urethane B agent.

The additives are resistant to surface drying and hardness and chemical resistance during foam removal and product molding, and to prevent discoloration and weakening of viscous force when exposed to sunlight.

In addition, the glass fiber rod 13 is installed in the center portion of the panel 11 mixed with 50 wt% of the composite urethane, 30 wt% of sand, and 20 wt% of CO ₂ .

In the present invention configured as described above, the composite urethane and sand are mixed or molded into a waterproof mortar or a building member using only the composite urethane. In this case, CO ₂ must be mixed and foamed.

The present invention is different from the urethane foamed by injecting gas into the existing urethane.

That is, in the past, moldings and the like were made by injecting a curing agent and a gas into a conventional urethane by injection foaming, but since the foamed urethane is not in a state of elasticity at all, it is easily damaged by external shocks, while in the present invention The composite urethane used is polyized (reacted) by mixing 50% by weight of MDI with 50% by weight of polyol having a molecular weight of 2,000 to 4,000 g / mol to have strong adhesion and elasticity, and to have abrasion resistance, chemical resistance, and aging resistance. Prepolymer urethane with NCO (nitrogen, carbon, oxygen) adjusted to 3.5 to 4.0, urethane mixed with 80% by weight polybasic polyol mixture, 3.0% by weight, 10% by weight of league, and 7.0% by weight of additive. A composite urethane was mixed to one.

Embodiments according to the manufacturing process of the present invention made as described above will be described in detail.

First Step: Urethane A

50% by weight of MDI with 50% by weight of polyol with a molecular weight of 2,000 to 4,000 g / mol to control the free NCO to 3.5 to 4.0. Prepolymer should be paid special attention to the reaction rate during the production process while stirring MDI at 100 to 200 RPM. Do not exceed 45 ° C while slowly injecting polyol.

After injecting the polyol (polyol) to check the NCO after stirring for 2 hours, if not reach 3.5 to 4.0 to adjust the free NCO using MDI. When stirring the MDI to proceed to the nitrogen gas atmosphere to prevent the inflow of moisture into the air.

FREE NCO in the term used in the present invention is a special synthetic rubber is expressed as nitrile-budadiene rubber (nitrile-budadiene rubber), and the polyol is a polyol is a material that reacts in pairs with isocyanate to produce polyurethane, This polyol is characterized by its OH number being inversely related to its molecular weight.

In more detail, the polyol can be divided into two broadly divided into polyetherpolyol and polyester polyol. Recently, polyether polyol has been used a lot, about 80-90%. Polyether polyols are also made by polymerizing ethylene oxide and propylene oxide under alkali catalysts. As the initiator, low molecular weight di, polyfunctional alcohols or amines are used.

Polyester polyols are obtained by polycondensation of di, polycarboxylic acids or condensation of anhydrides with di, polyalcohols. The most common polyester polyols are obtained by reaction with oligoether diols such as adipic acid or phthalic anhydride and diglycol containing 2 to 6 carbon atoms, or triols such as glycerol or trimethylol propane, and are widely used in elastomers, soft foams and rigid foams.

Polyether polyols can produce relatively low viscosity variations. Polymer polyols are solids dispersed in polyether polyols and are used to increase the hardness of foams.

Therefore, the present invention is prepared by pre-polymerizing 50% by weight of MDI to 50% by weight of polyol having a molecular weight of 2,000 to 4,000 g / mol to adjust the free NCO to 3.5 to 4.0. At the same time stirring the MDI and slowly injecting a polyol (polyol) at a temperature of 45 ℃ to prepare a urethane B agent.

Second Step: Manufacture of Urethane B

The urethane B agent is prepared by preparing the urethane B agent in the first step, and then mixing the 80 wt% of the polyfunctional polyol mixture, 3.0 wt% of the amides, 10 wt% of the league, and 7.0 wt% of the additive to prepare the urethane B agent.

3rd step: composite urethane

After the urethane A agent and the urethane B agent are respectively prepared, the urethane ratio of A and B is mixed in a ratio of 1: 1 to prepare a composite urethane.

The A and B urethanes prepared in the first step and the second step and the composite urethane prepared by mixing them are all carried out in a liquid (resin) process.

4th process: manufacturing waterproof mortar

50% by weight of the composite urethane prepared as described above, sand 30% by weight, CO ₂ 20% by weight to prepare a urethane foam waterproof mortar 80 by mixing, the mixing process is one side as shown in Figure 5 on one side And a tank 20, 20 'for accommodating the urethane A agent and the urethane B agent, and each urethane is mixed by the discharge pumps 40 and 40' by the discharge pumps 40 and 40 'through the electric heater 30. Is supplied. One side of the injection nozzle is provided with a hopper 60 having CO ₂ gas and sand. When the switch of the injection nozzle 50 is opened, the urethane A agent and the urethane B agent are formed by the pressure of the delivery pumps 40 and 40 '. At the same time, the CO ₂ gas and sand may be injected by the siphon action, and a pump 41 is installed at one side of the hopper 60 in which sand is embedded, so as to smoothly supply the spray nozzle.

At this time, the ratio of urethane A, B, sand, and CO ₂ gas is 50% by weight of composite urethane, 30% by weight of sand, and 20% by weight of CO _2. )

The mixing ratio of the urethane waterproofing Maltese 80 is to be mixed in the injection nozzle and blended by each nozzle hole size, but this is omitted as a secret to the nozzle manufacturing.

5th process: waterproof mortar foaming construction

The urethane waterproofing mortar of the present invention prepared by the first step to the fourth process is urethane waterproofing mortar in the cracked portion when spraying the urethane waterproofing mortar with a spray nozzle to the leaked portion when the crack is leaked inside the tunnel Is firmly attached and is waterproof without leaving off.

The urethane waterproof mortar sprayed by the spray nozzle is mixed with CO ₂ gas and sprayed, so urethane is foamed and adhered to the crack or construction site, and when dried, the crack is firmly filled with the crack. .

The present invention is carried out in this way, even if the injection by spraying the waterproof mortar only on the inner surface or the outer surface of the cracked portion is strong adhesion because it does not need a separate waterproof construction.

In addition, the repair work made as described above can be used not only inside the tunnel, but also for preventing leachate leakage from retaining walls, buildings, sewage treatment plants, and waste disposal plants.

In addition, in the case of the overall renovation work such as the building and the inside of the tunnel, install the fiberglass rods on the part to be renovated in the form of 井 and spray the urethane waterproof mortar with a thickness of 20mm to form the adhesive layer to repair the inside of the tunnel. It is easy to construct.

Briefly describing the spraying process sprayed from the urethane waterproofing nozzle, the urethane A agent and the urethane B agent are first electric heaters (pumps 42 and 42 'provided in the respective tanks 20 and 20'). 30). In the electric heater 30 is heated to a temperature of 110F ~ 120 ℃ and the CO ₂ gas and sand is mixed by the injection nozzle 50 through the respective passages by the delivery pump 40 is injected and foamed.

In addition, reference numeral 90 denotes a CO ₂ gas tank.

Forming the urethane waterproof mortar with a thickness of 20mm during the tunnel construction means that the glass fiber rods installed therein intersect 6mm to form a thickness of 12mm, so that it is buried and complete waterproofing of the inner wall of the tunnel is achieved. It is to achieve the maximum effect in the range that the space part according to the limit height does not decrease.

In addition, the present invention can be constructed by directly injecting the cracked portion, the damaged portion with a spray nozzle as described above, it can be sprayed in a mold having a predetermined shape to form a building member.

That is, the building member can be molded by forming a mold having the shape of a building panel, a sidewalk block, a tile, and an interior and exterior panel by spraying and filling urethane waterproof mortar with a spray nozzle.

After finishing the work, the spray nozzle cleans the inside of the spray nozzle using a solvent pump connected to the inside to prevent the nozzle part from being blocked.

Looking at the physical properties of the urethane waterproofing mortar of the present invention having a waterproof and moisture-proof, flexibility and elasticity, wear resistance and the like of the building member as shown in the following table.

As can be seen from Table 1 above, the waterproof mortar of the present invention has a wear index: 15, adhesive strength:> 1.000 (70.3㎏ / ㎡), elongation: 70%, hardness: 85, heat aging: 70 ° C (30 days). , Impact strength: crackless, moisture permeability: 0.038, anti-rupture: 250PSI, tensile strength: 1360PSI.

In addition, the urethane foam waterproof mortar of the present invention was tested for chemical resistance for use in wastewater treatment plants, waste treatment plants, chemically resistant flooring, pool linings, underground parking and ceilings, the results are shown in Table 2.

A: No abnormality at 168 hours of infiltration 21 ° C, B: No abnormality at 168 hours of infiltration 24 ° C, N: Not recommended for use.

As can be seen from Table 2, the present invention can be seen that the chemical resistance is very good in the remaining chemicals except for 70% nitric acid and xylene.

Urethane foam waterproof mortar of the present invention, as can be seen in Table 1 and Table 2, because it has a strong adhesive strength and fire resistance, it can be long-lasting without removable or damaged construction materials that are part or construction of reinforcement and repair work easily have.

The present invention thus achieved a simple and easy construction and reinforcement and waterproofing of concrete structures, such as tunnels, bridge deck slabs and piers, retaining walls, building floors and rooftop slabs, wastewater treatment plants, waste disposal plants, pool floors, etc. By constructing firmly, it is possible to reduce the management and maintenance costs.

Claims (5)

A prepolymer urethane A agent formed by adjusting 50% by weight of methylene diisocyanate (MDI) to 50% by weight of a polyol having a molecular weight of 2,000 to 4,000 g / mol to adjust the free NCO to 3.5 to 4.0, Manufacture urethane B which mixed 80 weight% of polybasic polyol mixtures, 3.0 weight% of gills, 10 weight% of leagues, and 7.0 weight% of additives, and the complex urethane which mixes the said urethane A and B agent in 1: 1 ratio Process of doing; 50% by weight of the prepared composite urethane, sand 30% by weight, CO ₂ 20% by weight, characterized in that the urethane foam waterproof mortar manufacturing method. The method of claim 1, The waterproof mortar is a urethane foam waterproof mortar manufacturing method, characterized in that it was prepared by mixing 80% by weight of the composite urethane and 20% by weight of CO ₂ . 50% by weight of MDI to 50% by weight of polyol with a molecular weight of 2,000 to 4,000 g / mol, prepolymer urethane A adjusted to 3.5 to 4.0 for free NCO, 80% by weight of polybasic polyol mixture, 3.0% by weight of amumi, Panel 11 by mixing and spraying 50% by weight of a composite urethane B, 30% by weight of sand, and 20% by weight of CO ₂ in a mold by mixing a urethane B agent mixed with 10% by weight of league and 7.0% by weight of an additive in a mold. Urethane foam waterproof building member, characterized in that made. The method of claim 3, The panel is a urethane foamed waterproof building member, characterized in that the glass fiber rod 13 is installed in the center of the panel 11 mixed with 50% by weight of the composite urethane, 30% by weight, CO ₂ 20% by weight. . The method of claim 3, The panel is a urethane foam waterproof building member, characterized in that the composite urethane and CO ₂ gas is mixed to form a panel and the glass fiber rod 13 is installed in the center portion of the panel.