KR100315917B1 - The method of preparing water-proofing layer sheet using hardning polyurethan resin of two liquid phase - Google Patents

Abstract

In the waterproofing of polyurethane resin such as the bottom or wall of a structure, the purpose of waterproofing was achieved by applying two-component polyurethane to the bottom or wall of a conventional structure to form a coating film. However, the problem of the construction method, i.e., the enormous time required for curing (Prolonged air) Hardening at high temperatures such as hydrolysis inhibitors, silica-based flow inhibitors, etc. A method of manufacturing a laminated sheet and a waterproof laminated sheet in which a waterproof adhesive composition is laminated on the sheet.

Description

Manufacturing method of waterproof laminated sheet using two-component polyurethane resin {THE METHOD OF PREPARING WATER-PROOFING LAYER SHEET USING HARDNING POLYURETHAN RESIN OF TWO LIQUID PHASE}

The present invention provides a method for producing a polyurethane waterproof sheet obtained by obtaining a polyurethane sheet using a two-component polyurethane resin and laminating rubberized asphalt on the sheet to form an adhesive layer.

Conventionally, waterproofing using polyurethane resin has been performed by mixing two-component resins at a predetermined mixing ratio in the field, applying a predetermined thickness, and then forming a waterproof coating through curing time.

This is due to the mixing at the work site, due to the mixing is not accurate, the desired properties do not come out.

In addition, such coating film waterproofing is applied after mixing and coating a polyurethane resin, and curing takes about 1 day to set the coating film having a waterproof function, until the curing is completely cured until the product properties It takes about 14 days, and during curing, it is maintained in the form of liquid, especially at the initial stage. Unexpected, especially when applying vertical parts such as walls, it is difficult to form a waterproof film with a certain thickness due to the flow of polyurethane resin, so it is thin because it is easy to break down due to concentration of external impact or pressure on a thin layer after curing. The coating should be applied several times.

In the process of hardening, it is gradually hydrolyzed by reacting with moisture on the floor or moisture in the air, and thus deterioration of physical properties is inevitable.

In addition, the balance between the adhesive strength and the tensile strength of the formed waterproof coating can withstand the cracks of the mother, but general polyurethane coating waterproofing materials have high adhesive strength with the mother surface and low tensile resistance to cracks, so that the waterproof coating can be cracked. As rupture occurs, the waterproofing function is lowered. In order to prevent this, the thickness of the coating film needs to be thickened, thereby increasing the amount of expensive urethane.

Another conventional urethane coating film waterproofing material is a taal urethane coating film waterproofing material.

It has excellent mechanical properties, good water resistance and alkali resistance, excellent weather resistance and abrasion resistance, and can appropriately adjust the adhesive strength, thereby eliminating problems caused by differences in tensile strength and adhesive strength of the coating film.

However, in the construction method of such a urethane coating waterproofing agent, the common material and the hardening agent are mixed well by a mixer in the field, and after adjusting the solution, the liquid is uniformly applied to the coated surface pretreated using a rubber spatula, a comb-shaped iron or an applicator. It is applied 1 ~ several times with thickness (1.5-2mm), and the viscosity is adjusted to the applied part properly in the uneven surface to prevent flow spots. After forming the film, protective mortar, etc., is added on the walking part. In this case, to prevent the bleeding of tiles, color finishing is done by paints with good weather resistance, which requires a lot of time in the work and goes through several stages of work process, resulting in high labor costs.

The present invention is an attempt to solve the problems arising in the coating film waterproofing of the conventional polyurethane can greatly reduce the tremendous time required for curing during waterproof construction significantly and also the poly when waterproof construction on the bottom surface with a lot of irregularities It prevents rupture of the waterproof coating caused by the non-uniformity of the coating film caused by the flowability of the urethane liquid resin, and hydrolyzes by reacting with moisture on the bottom surface or moisture in the air during curing when applying the liquid polyurethane resin. In addition, it prevents deterioration of physical properties, and in addition, adjusts the adhesive strength between polyurethane waterproofing film and the bottom surface appropriately, and prevents polyurethane film rupture caused by imbalance between adhesive strength and coating tensile strength. Standardized polyurethane waterproofing sheet with rubberized asphalt It will be the object to gongham.

Polyurethane elastomers, polyurethane paints, adhesives, synthetic leather rubbers, etc. are prepared by selecting polyurethane as an isocyanate, polyester polyol or polyester polyol or other hydrous acid compound to suit the purpose and physical properties. Since the polymer of the end group and the isocyanate group are molded into a polyurethane sheet having a waterproof function while undergoing a chain extension and a curing process of a crosslinking reaction by crosslinking, physical properties are highly required in forming the polyurethane.

First of all, in manufacturing polyurethane sheet from two-component urethane resin, since it is hardened from solid state to liquid phase, which is a characteristic of two-component urethane resin, it is necessary to manufacture a sheet of uniform thickness by preventing flow before curing. Foaming by mixing also greatly weakens the physical properties of the sheet, so it is important to suppress the foaming and degass the generated bubbles in a short time to remove the remaining bubbles during the sheet forming process, and isocyanate in the two-component urethane synthetic resin remains in the air. As it may cause deterioration of physical properties by reacting with water, it should be designed as a fast curing method and it should prevent hydrolysis by minimizing hydrolysis reaction.

In addition, the rubberized asphalt composition laminated on the polyurethane sheet has excellent waterproof function and should not be damaged by dissolving or eroding the polyurethane sheet, and in particular, the change of state such as viscosity and adhesiveness should be extremely small according to temperature change over a long period of time. The rubberized asphalt layer that is directly bonded to the concrete matrix should be a waterproof adhesive layer composition that can improve the resistance to the mother crack as a waterproofing function by maximizing the softening since the softening of the rubberized asphalt layer is possible due to the protection function of the polyurethane layer. do.

Referring to the production method and composition of the polyurethane sheet that can have the above requirements are as follows.

Polycarbodiamide and silica-based flow inhibitor were added to the two-component urethane resin, and the polyurethane sheet molding composition was uniformly mixed under reduced pressure and passed through a roller to a uniform conveyor belt plate having a uniform thickness (0.5- 2 mm) is cured in the process of passing through a drying furnace equipped with a moisture absorbent maintained at 110-120 ℃ after coating to obtain a polyurethane sheet.

At this time, the composition and composition ratio used in the polyurethane sheet manufacturing method is as follows Table (1).

In using the two-component polyurethane resin in the above method, the bubbles generated during the mixing process remain on the sheet after curing, which greatly deteriorates the physical properties. Thus, the mixing process is carried out in a closed container which is depressurized to degas bubbles. Therefore, it is possible to completely remove bubbles and use polycarbodiamide with excellent hydrolysis prevention function to prevent property degradation due to reaction with moisture present in the air. It is moved from the conveyor belt plate to prevent the flow, and by using the silica-based flow prevention material to have a certain thickness, it is possible to obtain a polyurethane sheet having a uniform thickness and to prevent the hydrolysis causing the deterioration of physical properties two-component urethane mixed resin Heavy Isocyanates Remain Moisture in Air It can cause degradation of the physical properties in response to the fast designed sokgyeong type.

That is, the reaction of urethane and isocyanate has a significant effect of temperature, and as the reaction temperature increases, the crosslinking reaction proceeds faster than the chain extension reaction and crosslinking tends to increase.

Particularly, at a temperature of 70 ° C. or higher, it is evident that rapid reactivity is exhibited despite the type of diisocyanate. In this method, the above object was achieved by maintaining the temperature at 110-120 ° C.

In addition, in order to obtain the above-mentioned waterproof adhesive layer composition, brown asphalt is put into a tank and melted completely while maintaining the temperature at 110 ° C., and SBS rubber, aromatic non-drying oil, rosin, and filler are placed in a separate tank to be melted and dissolved while maintaining at 120 ° C. Then, a viscous waterproof adhesive composition obtained by adding the above-mentioned molten asphalt to the mixture for 6-8 hours is obtained.

Composition and composition ratio of such a waterproof adhesive composition (rubber asphalt) are as follows in Table 1.

As a characteristic of the composition, brown asphalt has waterproof, adhesion, and corrosion resistance, but the present composition has waterproof and adhesive functions as its main functions, and when its amount is high, fluidity increases when temperature rises according to seasonal changes. May occur, and the fluid solution may leach from the joints, resulting in poor waterproofness and adhesion.

In addition, synthetic rubber has adhesiveness and shock absorbency, and when used in a large amount, it is difficult to disperse in asphalt, and it requires high temperature maintenance and a long mixing time, and a nonuniform mixture, that is, small lumps, appears.

In addition, the adhesive strength is increased when weaving rosin, but when a large amount is used, the hardness becomes high and cold resistance falls.

In addition, the non-drying oil acts to prevent the hardening and always maintain a constant viscosity when the temperature is lowered according to the temperature change.

Summarizing the overall manufacturing method of the waterproof laminated sheet as described above, polycarbodiamide and silica-based flow inhibitor were added to the two-component polyurethane resin, and the composition liquid for molding the polyurethane sheet was uniformly mixed under reduced pressure and passed through a roller. Two-component type, characterized by applying a constant thickness to the treated smooth conveyor belt plate, and subsequently laminating the waterproof adhesive composition on the cured polyurethane sheet by passing through a drying furnace equipped with an absorbent maintained at a temperature of 110-120 ° C. The present invention relates to a method of manufacturing a waterproof laminated sheet using a polyurethane resin.

Polyurethane resin, which has been used for the conventional waterproofing purpose, has achieved the purpose of waterproofing by forming a coating film on the bottom surface or the entire wall surface of the structure in the field.

The present invention was able to solve the problems of the conventional method by producing a standardized waterproof laminated sheet by changing the conventional method as described above and its features and advantages are as follows.

First, it is possible to prevent the loss caused by the mixing failure of the conventional method by mixing and mixing the raw materials with accurate weighing and equipment in the factory,

Second, by using the waterproof laminated sheet standardized by the property hardening method in the field, it can save enormous time for hardening during construction, and can greatly omit the complicated process required by the conventional construction method, and it occurs in the conventional method. It can solve the non-uniformity of the film thickness due to the flow of liquid resin

Third, due to the softening properties and the proper adhesion of rubberized asphalt laminated on the polyurethane sheet, it is possible to prevent the rupture or damage of the polyurethane sheet caused by the imbalance of the tensile strength of the polyurethane sheet and the adhesive strength between the mother sheets when a crack occurs in the conventional matrix. And

Fourth, the manufacturing system structured in the factory is manufactured by the fast curing method, so that moisture existing in the mother (bottom or wall) during the field construction of the conventional two-component urethane resin or water in the air may be It is possible to prevent deterioration of physical properties caused by decomposition reaction.

As described above, the waterproof laminated sheet according to the present invention is a standardized product, which is not only easy to install, but also does not require hardening time, and thus, it can be called a breakthrough polyurethane waterproofing layer in terms of shortening of air and saving on labor cost. It can be called a product.

Claims (3)

Polycarbodiamide and silica-based flow inhibitor were added to the two-component polyurethane resin, and the composition solution for molding the polyurethane sheet was uniformly mixed under reduced pressure and passed through a roller to apply a uniform thickness to the release-treated smooth conveyor belt plate. Method of producing a waterproof laminated sheet using a two-component polyurethane resin, characterized in that the water-resistant adhesive composition is continuously applied to the urethane sheet cured by passing through the drying degree with the absorbent maintained at a temperature of 110-120 ℃ after curing. . The two-component polyurethane according to claim (1), wherein the composition ratio of the polyurethane sheet molding composition is 97.5-99% for two-component polyurethane resins, 0.5-1.5% for polycarbodiamides, and 0.5-1% for silica-based flow inhibitors. Manufacturing method of waterproof laminated sheet using resin. The waterproof laminated sheet according to claim 1, wherein the composition of the waterproof adhesive composition is 60% Brown asphalt, 15% SBS rubber, 10% aromatic non-drying oil, 7.5% rosin, and 7.5% filler. Manufacturing method.