KR20210035386A - Waterproof sheet having excellent aseismicity and self-healing ability - Google Patents

Abstract

The present invention relates to a waterproof sheet including: an asphalt adhesive layer; a carbon fiber layer formed on the asphalt adhesive layer; a first waterproofing layer formed on the carbon fiber layer and including at least one selected from polypropylene (PP)-based elastomer and polyethylene (PE)-based elastomer, and a thermoplastic elastomer; and a second waterproofing layer formed on the first waterproofing layer. The present invention provides the waterproof sheet including the carbon fiber layer, so that the impact resistance is strengthened, the seismic performance is excellent, and reinforced heat and corrosion resistance are also reinforced. The waterproof sheet includes the first waterproofing layer including at least one selected from polypropylene (PP)-based elastomer and polyethylene (PE)-based elastomer, and a thermoplastic elastomer, so that the self-healing power is exerted even when a crack occurs in the outermost urethane layer, thereby performing a waterproof function.

Description

Waterproof sheet with excellent seismic performance and self-recovery ability {WATERPROOF SHEET HAVING EXCELLENT ASEISMICITY AND SELF-HEALING ABILITY}

The present invention relates to a waterproof sheet excellent in seismic performance and self-recovery power.

In general, rainwater or groundwater may seep into concrete structures such as roof slabs, roofs, basements of buildings, or various fluid storage tanks because the waterproofing power is weak. Due to the change in the volume of the concrete structure, cracks may occur, which can shorten the life of the building.

In addition, when rainwater or groundwater flows in or leaks through a crack in a concrete structure, the bonding strength of the concrete material decreases, and void cracks occur due to changes in the volume of water due to temperature changes. Since the strength and lifespan of the structure forming the bridge surface is reduced and the function of the building is lost, the waterproof construction to prevent the penetration of rainwater or groundwater in the concrete structure is very important.

In particular, in the case of the bridge surface, as the vehicle passes, the upper plate is bent by its own load and impact, and vibration is generated, resulting in fine cracks in the pavement layer, resulting in separation from the bridge surface and the pavement layer, resulting in rain or condensation water. Due to this, it penetrates into the bridge surface and promotes cracking of the upper plate, and corrodes the structure or the reinforcing bars that form the structure, thereby reducing the life of the structure and causing the risk of collapse. Therefore, there is a need for a waterproofing material having physical properties capable of suppressing the expansion of cracks in structures by absorbing loads and impacts and perfect waterproofing of buildings, particularly those requiring high-strength waterproofing sheets or nuclear power plants.

The most commonly used waterproofing method is the urethane coating waterproofing method. The urethane coating waterproofing method is to construct the waterproof surface with urethane, which has the advantage of being easy to repair, but its strength is weak, and thus, there is a disadvantage that water may permeate when the urethane is torn. In addition, there is a problem in that the waterproof function is not exhibited due to the occurrence of cracks as time elapses after construction.

The present invention has been devised in view of the above circumstances, and has excellent seismic performance, and an object of the present invention is to provide a waterproof sheet capable of exerting self-resilience when cracks occur.

According to an aspect of the present invention, an asphalt adhesive layer; A carbon fiber layer formed on the asphalt adhesive layer; A first waterproof layer formed on the carbon fiber layer and comprising at least one selected from polypropylene (PP)-based elastomer and polyethylene (PE)-based elastomer, and a thermoplastic elastomer; And a second waterproof layer formed on the first waterproof layer.

The asphalt adhesive layer is based on 50 parts by weight of straight asphalt, 8 to 15 parts by weight of styrene-butadiene-styrene (SBS), 10 to 20 parts by weight of process oil, 8 to 22 parts by weight of calcium carbonate, 1 to 5 parts by weight of tackifier It may be made by mixing parts and 1 to 5 parts by weight of a modification modifier.

The thickness of the carbon fiber layer may be 0.1 to 1.3mm.

The PP (polypropylene)-based elastomer may be a propylene homopolymer or a copolymer containing propylene.

The thermoplastic elastomer may be included in an amount of 20 to 500 parts by weight of a thermoplastic elastomer based on 100 parts by weight of a PP (polypropylene)-based elastomer and a PE (polyethylene)-based elastomer.

The thickness of the first waterproof layer may be 0.3 to 1.5 mm.

The second waterproof layer may include a urethane resin.

The thickness of the second waterproof layer may be 0.1 to 2.0 mm.

According to the present invention, as the carbon fiber layer is included, a waterproof sheet with reinforced impact resistance and excellent seismic performance, heat resistance and corrosion resistance is also provided, and PP (polypropylene) elastomer and PE (polyethylene) based By including a first waterproof layer including at least one selected from among elastomers and a thermoplastic elastomer, even when a crack occurs in the outermost urethane layer, there is provided a waterproof sheet capable of performing a waterproof function by exerting self-healing power.

1 schematically shows a waterproof sheet according to an embodiment of the present invention.
2 and 3 show the results of evaluating the maximum load and the maximum stress of the waterproof sheet according to Preparation Example and Comparative Preparation Example of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to various examples. However, embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.

The present invention relates to a waterproof sheet having excellent seismic performance and self-recovery power, and according to an aspect of the present invention, an asphalt adhesive layer; A carbon fiber layer formed on the asphalt adhesive layer; A first waterproof layer formed on the carbon fiber layer and comprising at least one selected from polypropylene (PP)-based elastomer and polyethylene (PE)-based elastomer, and a thermoplastic elastomer; And a second waterproof layer formed on the first waterproof layer.

The asphalt adhesive layer is based on 50 parts by weight of straight asphalt, 8 to 15 parts by weight of styrene-butadiene-styrene (SBS), 10 to 20 parts by weight of process oil, 8 to 22 parts by weight of calcium carbonate, 1 to 5 parts by weight of tackifier It may be made by mixing parts and 1 to 5 parts by weight of a modification modifier.

The straight asphalt is a material that remains last when crude oil is removed through an atmospheric pressure, vacuum distillation apparatus, or the like, and contains a lot of bituminous material that is not decomposed. When the penetration degree of the straight asphalt is about 40 or less, it is mainly used for industrial purposes, and when the penetration degree is about 40 or more, it is used for road pavement or for a structure for repair. Accordingly, it is preferable that the penetration degree of straight asphalt used in the present invention is 60 or more.

Styrene-butadiene-styrene (Styrene Butadiene Styrene, SBS) is a thermoplastic rubber and is a modifier added to modify straight asphalt. Thermoplastic rubber, styrene-butadiene-styrene, is largely divided into linear type and radial type.Since the molecular weight of styrene-butadiene-styrene of the radial type is high, the viscosity of the coating waterproofing material is excessively increased, so it is not suitable for low-temperature melting applications. Since it is not suitable, it is preferable to use a linear type of styrene-butadiene-styrene having a relatively low molecular weight in the present invention.

Process Oil is made of any one of naphthene, paraffin, and isoparaffin. Process oil is a mineral oil added to improve workability in the working process (mixing, extruding, etc.) of compounded rubber. Mainly, paraffinic, naphthenic, aromatic, etc. obtained from high-boiling oil fractions are used.

In the present invention, calcium carbonate is used as a filler. In addition to the above calcium carbonate, carbon black, dolomite, etc. may be used as a filler.

The tackifier may be petroleum resin or vegetable starch, and it is preferable to use petroleum resin. The tackifier has strong initial fixing power and eco-friendliness, and it provides convenience according to use because it does not require the use of nails.

In addition, the modification modifier in the present invention is preferably chloroprene rubber (CR) to improve flexibility and adhesion.

Meanwhile, the asphalt adhesive layer may further include one or more components of polyethylene (PE) and thermoplastic polyolefin (TPO), if necessary, in order to further improve adhesive performance.

In addition, the asphalt adhesive layer may include pulp, which is an oil absorbing agent for reinforcing strength, if necessary, and preferably may be included in an amount of 1 to 3 parts by weight. The oil absorbent prevents moisture, oil, etc. from entering the contents, and silica gel, an ageless agent, or the like may be used.

A carbon fiber layer is formed on the asphalt adhesive layer, and the type is not particularly limited. The carbon fiber layer may be formed using, for example, a carbon fiber fabric, a carbon fiber sheet, and a carbon fiber nonwoven fabric. Since the carbon fiber has high tensile strength, low thermal expansion properties, excellent durability and corrosion resistance, the waterproof sheet including the carbon fiber according to the present invention has excellent waterproofness and at the same time improves the reinforcement of the concrete structure over time. Accordingly, it is possible to expect the effect of improving seismic performance to solve problems such as cracks, tearing, or leakage.

The carbon fiber constituting the carbon fiber layer may be a carbon fiber commercially available and used in various ways in the art, for example, a carbon fiber fabric, a carbon fiber sheet, and a carbon fiber nonwoven fabric. However, the thickness of the carbon fiber layer is preferably 0.3mm, more preferably 0.1 to 0.3mm. If it is less than 0.1mm, the tensile strength is insufficient and the effect of enhancing reinforcement may be weak, whereas if it exceeds 0.3mm, it may cause problems in construction due to loss of flexibility, and the use of expensive carbon fiber As this increases, economic problems can arise.

On the other hand, on the carbon fiber layer, a first waterproof layer including a thermoplastic elastomer and at least one selected from polypropylene (PP)-based elastomer and PE (polyethylene)-based elastomer is formed. The first waterproof layer includes at least one selected from PP-based elastomer, PE-based elastomer, and EPDM, and a thermoplastic elastomer, thereby absorbing external impact and protecting the carbon fiber sheet. When a crack occurs in the second waterproof layer disposed on the surface, it is possible to prevent deterioration of the waterproof function by exerting a self-healing force. EPDM may be included in the first waterproof layer, but it is more preferable to use at least one selected from polypropylene (PP)-based elastomer and polyethylene (PE)-based elastomer in consideration of economy.

On the other hand, the PP-based elastomer is a polymer obtained by polymerizing a propylene monomer, and in the present invention, the PP-based elastomer may include at least one of a homopolymer of a propylene monomer and a copolymer having a propylene monomer as a main component of a constituent unit. In the above copolymer, for example, the proportion of the propylene monomer occupying the constituent unit is preferably 50% by mass or more, more preferably 80% by mass or more, and in particular, the proportion of the propylene monomer is 90% by mass or more. desirable. In addition, the copolymerization may be random copolymerization or block copolymerization.

In the present invention, the PP (polypropylene)-based elastomer and PE (polyethylene)-based elastomer have good mechanical properties, light weight, and correspond to the main resin of the first waterproof layer, thereby improving elongation and breaking the carbon fiber, By elongation, it is possible to prevent complete breakage of the waterproof layer, and by self-elasticity, it can exhibit self-healing force.

On the other hand, in the present invention, the first waterproof layer includes a thermoplastic elastomer, and through interaction with at least one selected from the PP-based elastomer and the PE-based elastomer as the main resin, it has excellent impact resistance and at the same time excellent elongation. It can express self-recovery power. Furthermore, the first waterproof layer may absorb external impacts and protect the carbon fiber layer at the same time.

Examples of the thermoplastic elastomer include propylene-α olefin elastomer such as ethylene-hexene elastomer, ethylene-octene elastomer, propylene-hexene elastomer, propylene-octene elastomer, ethylene-propylene-diene elastomer, etc. Thermoplastic olefin elastomer including elastomer, styrene-butadiene block copolymer, styrene-isoprene block copolymer, hydrogenated styrene-butadiene elastomer, styrene-butadiene-styrene elastomer, styrene-ethylene-butylene-styrene elastomer And thermoplastic styrene-based elastomers including styrene-ethylene-propylene-styrene-based elastomers, and the like, and these may be used alone or as a mixture thereof.

Meanwhile, in the first waterproof layer, the thermoplastic elastomer is preferably contained in an amount of 20 to 500 parts by weight based on 100 parts by weight of at least one main resin selected from PP-based elastomer and PE-based elastomer. If it is less than 20 parts by weight, it is difficult to achieve the purpose of securing scratch self-regeneration, and if it exceeds 500 parts by weight, there is a concern that heat resistance may be poor.

On the other hand, the thickness of the first waterproof layer is preferably 0.3 to 1.5mm, more preferably 0.3 to 1.0mm. If it is less than 0.3mm, sufficient self-healing force cannot be expressed, and if it is more than 1.5mm, there is a problem of lack of economic feasibility.

A second waterproof layer including a urethane resin is formed on the first waterproof layer. In order to exhibit a sufficient waterproof effect, the thickness of the second waterproof layer is preferably 0.1 to 2.0 mm.

As described above, as the waterproof sheet according to the present invention includes a carbon fiber layer, impact resistance is reinforced to provide excellent seismic performance, as well as heat resistance and corrosion resistance, and are selected from PP-based elastomers and PE-based elastomers. By including the first waterproof layer including at least one type and a thermoplastic elastomer, even when a crack occurs in the second waterproof layer including the urethane resin formed on the outermost side, it is possible to perform a waterproof function by exerting self-healing power.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are only examples to aid understanding of the present invention, and the scope of the present invention is not limited thereto.

Example

Manufacturing example

Based on 50 parts by weight of straight asphalt on one side of a sheet of 1mm carbon fiber, 10 parts by weight of styrene-butadiene-styrene (SBS), 15 parts by weight of naphthene as a process oil, 20 parts by weight of calcium carbonate as a filler, and petroleum resin as a tackifier An asphalt adhesive layer composed of 3 parts by weight and 3 parts by weight of chloroprene rubber as a modification modifier was formed.

On the opposite side of the carbon fiber on which the asphalt adhesive layer is formed, a first waterproof layer prepared by including a PP-based elastomer having a ratio of 90% by mass or more of a propylene monomer and an ethylene-hexene-based elastomer in a ratio of 1:1 is formed, and the first waterproofing layer is formed. 1 A seismic waterproof sheet having a thickness of 50 mm was prepared by forming a second waterproof layer including a urethane resin on the waterproof layer.

Comparative Production Example

A waterproof sheet having a thickness of 50 mm was prepared in the same manner as in Example 1, except that there was no carbon fiber and the first waterproof layer.

The maximum load and maximum stress test results were performed on the waterproof sheet according to the Preparation Example and the Comparative Preparation Example, and are shown in FIGS. 2 and 3. The carbon fiber item indicates the physical properties of the carbon fiber used in the preparation examples of the present invention.

2 and 3, it can be seen that the waterproof sheet according to the manufacturing example of the present invention has a remarkably improved maximum load and maximum stress compared to the waterproof sheet of the comparative manufacturing example.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and variations are possible without departing from the technical spirit of the present invention described in the claims. It will be obvious to those of ordinary skill in the field.

100: waterproof sheet
20: asphalt adhesive layer
40: carbon fiber layer
60: first waterproof layer
80: second waterproof layer

Claims (8)

Asphalt adhesive layer;
A carbon fiber layer formed on the asphalt adhesive layer;
A first waterproof layer formed on the carbon fiber layer and comprising at least one selected from polypropylene (PP)-based elastomer and polyethylene (PE)-based elastomer, and a thermoplastic elastomer; And
A waterproof sheet comprising a second waterproof layer formed on the first waterproof layer.
The method of claim 1,
The asphalt adhesive layer is based on 50 parts by weight of straight asphalt, 8 to 15 parts by weight of styrene-butadiene-styrene (SBS), 10 to 20 parts by weight of process oil, 8 to 22 parts by weight of calcium carbonate, 1 to 5 parts by weight of tackifier A waterproof sheet, characterized in that made by mixing 1 to 5 parts by weight of a part and a modification modifier.
The method of claim 1,
Waterproof sheet, characterized in that the thickness of the carbon fiber layer is 0.1 to 0.3mm.
The method of claim 1,
The waterproof sheet, characterized in that the PP (polypropylene)-based elastomer is a propylene homopolymer or a copolymer containing propylene.
The method of claim 1,
The thermoplastic elastomer is a waterproof sheet comprising 20 to 500 parts by weight of a thermoplastic elastomer based on 100 parts by weight of at least one selected from PP (polypropylene) elastomer and PE (polyethylene) elastomer.
The method of claim 1,
Waterproof sheet, characterized in that the thickness of the first waterproof layer is 0.3 to 1.5mm.
The method of claim 1,
Waterproof sheet, characterized in that the second waterproof layer comprises a urethane resin.
The method of claim 1,
Waterproof sheet, characterized in that the thickness of the second waterproof layer is 0.1 to 2.0mm.

Images