KR102269571B1 - Waterproof sheet having excellent aseismicity and self-healing ability - Google Patents

Abstract

The present invention is 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 a polypropylene (PP)-based elastomer and a polyethylene (PE)-based elastomer and a thermoplastic elastomer; and a second waterproofing layer formed on the first waterproofing layer. According to the present invention, as the carbon fiber layer is included, not only the impact resistance is strengthened and the earthquake resistance performance is excellent, but also heat resistance and corrosion resistance are provided, and a waterproof sheet is provided, and a PP (polypropylene)-based elastomer and PE (polyethylene)-based elastomer are provided. By including a first waterproof layer including at least one selected from elastomers and a thermoplastic elastomer, even when cracks occur in the outermost urethane layer, there is provided a waterproof sheet capable of performing a waterproof function by exhibiting self-restoring power.

Description

A waterproof sheet with excellent seismic resistance and self-healing power {WATERPROOF SHEET HAVING EXCELLENT ASEISMICITY AND SELF-HEALING ABILITY}

The present invention relates to a waterproof sheet having excellent seismic resistance and self-healing power.

In general, rainwater or groundwater may seep into concrete structures such as rooftop slabs, roofs, basements of buildings, or various fluid storage tanks because of their weak waterproofing power, which not only reduces the bonding strength of the concrete itself, but also reduces moisture caused by temperature changes. The volume change of the concrete may cause cracks in the concrete structure, shortening the lifespan of the building.

In addition, when rainwater or groundwater flows in or leaks through cracks in the concrete structure, the bonding strength of concrete materials is lowered, and pore cracks are generated according to the volume change of water due to temperature change. Since the strength and lifespan of the structures forming the bridge surface are reduced, and the functions of the buildings are lost, waterproofing to prevent the penetration of rainwater or groundwater in concrete structures is very important.

In particular, in the case of a bridge, as the vehicle passes, the top plate is bent and vibration is generated by its own load and impact, which causes microcracks in the pavement layer and separation between the bridge surface and the pavement layer. Due to this, it can penetrate into the bridge deck and promote cracking of the deck, and corrode the structure or reinforcing bars forming the structure, leading to a shortened lifespan of the structure and the risk of collapse. Therefore, there is a need for a waterproofing material having physical properties that can suppress the expansion of cracks in structures by absorbing loads and shocks and perfect waterproofing of buildings and bridges that require a building, particularly a nuclear power plant or other high-strength waterproofing sheets.

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

The present invention has been devised in view of the above circumstances, and it is an object of the present invention to provide a waterproof sheet having excellent seismic performance and exhibiting self-restoring power when cracks occur.

According to one 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 a polypropylene (PP)-based elastomer and a polyethylene (PE)-based elastomer and a thermoplastic elastomer; and a second waterproofing layer formed on the first waterproofing layer is provided.

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

The carbon fiber layer may have a thickness of 0.1 to 1.3 mm.

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

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

The first waterproof layer may have a thickness of 0.3 to 1.5 mm.

The second waterproof layer may include a urethane resin.

The second waterproof layer may have a thickness of 0.1 to 2.0 mm.

According to the present invention, as the carbon fiber layer is included, not only the impact resistance is strengthened and the earthquake resistance performance is excellent, but also heat resistance and corrosion resistance are provided, and a waterproof sheet is provided, and a PP (polypropylene)-based elastomer and PE (polyethylene)-based elastomer are provided. By including a first waterproof layer including at least one selected from elastomers and a thermoplastic elastomer, even when cracks occur in the outermost urethane layer, there is provided a waterproof sheet capable of performing a waterproof function by exhibiting self-restoring power.

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

Hereinafter, preferred embodiments of the present invention will be described with reference to various examples. However, the embodiment of the present invention may be modified in 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 resistance and self-healing power, and according to one aspect of the present invention, 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 a polypropylene (PP)-based elastomer and a polyethylene (PE)-based elastomer and a thermoplastic elastomer; and a second waterproofing layer formed on the first waterproofing layer is provided.

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

The straight asphalt is the last remaining material when the light component is removed from crude oil through atmospheric pressure, vacuum distillation apparatus, etc., and contains a lot of non-decomposable bitumen. When the penetration of the straight asphalt is about 40 or less, it is mainly used for industrial purposes, and when the penetration is about 40 or more, it is used for road paving or for structures for repair. Accordingly, the penetration of the straight asphalt used in the present invention is preferably 60 or more.

Styrene-butadiene-styrene (Styrene Butadiene Styrene, SBS) is a thermoplastic rubber, and is a modifier added to modify straight asphalt. Styrene-butadiene-styrene, a thermoplastic rubber, is largely divided into linear type and radial type. Since it is not suitable, in the present invention, it is preferable to use a linear type styrene-butadiene-styrene having a relatively low molecular weight.

Process oil consists 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. Paraffinic, naphthenic, aromatic, etc. obtained from high boiling point fractions of petroleum are mainly used.

In the present invention, calcium carbonate is used as a filler. In addition to the 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 adhesion and eco-friendliness, and there is no need to use nails, so convenience is provided.

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

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

In addition, the asphalt adhesive layer may contain pulp, which is an oil absorbent for strength reinforcement, if necessary, and may preferably 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, ageless agent, etc. may be used.

A carbon fiber layer is formed on the asphalt adhesive layer, and the type thereof 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 improves the reinforcing properties of the concrete structure over time. Accordingly, the effect of improving the seismic performance can be expected to solve problems such as cracks, tears, or leakage.

Carbon fibers constituting the carbon fiber layer may be commercially available and variously used carbon fibers in the art, for example, carbon fiber fabric, carbon fiber sheet, and 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 may be insufficient and the effect of enhancing the reinforcing effect may be weak, whereas if it is more than 0.3mm, problems may occur in construction due to loss of flexibility, and the amount of expensive carbon fiber used As this increases, economic problems may arise.

Meanwhile, on the carbon fiber layer, a first waterproof layer including at least one selected from a polypropylene (PP)-based elastomer and a polyethylene (PE)-based elastomer and a thermoplastic 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 an external impact and protecting the carbon fiber sheet as well as the outermost layer. When a crack occurs in the second waterproof layer disposed on the , it is possible to prevent deterioration of the waterproof function by exerting a self-restoring force. The first waterproof layer may include EPDM, but in consideration of economic feasibility, it is more preferable to use at least one selected from a polypropylene (PP)-based elastomer and a polyethylene (PE)-based elastomer.

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 containing a propylene monomer as a structural unit as a main component. In the copolymer, for example, the proportion of the propylene monomer that occupies the structural unit is preferably 50 mass% or more, the proportion of the propylene monomer is more preferably 80 mass% or more, and the proportion of the propylene monomer is 90 mass% or more, particularly desirable. In addition, random copolymerization may be sufficient as copolymerization, and block copolymerization may be sufficient as it.

In the present invention, the PP (polypropylene)-based elastomer and PE (polyethylene)-based elastomer have good mechanical properties and light weight and correspond to the main resin of the first waterproofing layer, thus improving the elongation, and when the carbon fiber is broken, It can be stretched to prevent complete breakage of the waterproofing layer, and by self-elasticity, self-healing force can be exhibited.

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 PE-based elastomer as the main resin, not only has excellent impact resistance, but also has excellent elongation. self-healing power can be expressed by Furthermore, the first waterproof layer may also serve to absorb an external impact and protect the carbon fiber layer.

Examples of the thermoplastic elastomer include ethylene-α-olefin-based elastomers such as ethylene-hexene-based elastomer and ethylene-octene-based elastomer, propylene-α-olefin-based elastomer such as propylene-hexene-based elastomer, and propylene-octene-based elastomer, ethylene-propylene-diene-based Thermoplastic olefin-based elastomer including elastomer, styrene-butadiene block copolymer, styrene-isoprene block copolymer, hydrogenated styrene-butadiene elastomer, styrene-butadiene-styrene-based elastomer, styrene-ethylene-butylene-styrene-based 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 waterproofing layer, the thermoplastic elastomer is preferably included 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. When it is less than 20 parts by weight, it is difficult to achieve the purpose of securing scratch self-renewal, and when it exceeds 500 parts by weight, there is a fear that the heat resistance may be poor.

On the other hand, the thickness of the first waterproof layer is preferably 0.3 to 1.5 mm, more preferably 0.3 to 1.0 mm. If it is less than 0.3mm, it is not possible to express sufficient self-restoring power, and if it is more than 1.5mm, there is a problem of insufficient economic feasibility.

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

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

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

Example

production example

Based on 50 parts by weight of straight asphalt on one side of a sheet of 1 mm carbon fiber, 10 parts by weight of styrene-butadiene-styrene (SBS), 15 parts by weight of naphthene as process oil, 20 parts by weight of calcium carbonate as a filler, 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 waterproofing layer prepared by including a PP-based elastomer having a propylene monomer ratio of 90% by mass or more and an ethylene-hexene-based elastomer in a 1:1 ratio is formed, and the first waterproofing layer is formed. 1 A second waterproof layer including a urethane resin was formed on the waterproof layer to prepare a seismic waterproofing sheet having a thickness of 50 mm.

Comparative Preparation 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 for the waterproof sheet according to the Preparation Examples and Comparative Preparation Examples were performed, and the results are shown in FIGS. 2 and 3 . The carbon fiber item indicates the physical properties of the carbon fiber used in the preparation example of the present invention.

2 and 3 , it can be seen that the waterproof sheet according to the preparation example of the present invention has significantly improved maximum load and maximum stress compared to the waterproof sheet of the comparative preparation 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 within the scope without departing from the technical spirit of the present invention described in the claims. It will be apparent to those of ordinary skill in the art.

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 waterproofing layer formed on the carbon fiber layer and including a polyethylene (PE)-based elastomer and a thermoplastic elastomer; and
A waterproof sheet including a second waterproof layer formed on the first waterproof layer.
According to claim 1,
The asphalt adhesive layer, based on 50 parts by weight of straight asphalt, 8-15 parts by weight of styrene-butadiene-styrene (SBS), 10-20 parts by weight of process oil, 8-22 parts by weight of calcium carbonate, 1-5 parts by weight of a tackifier A waterproof sheet, characterized in that it is made by mixing parts and 1 to 5 parts by weight of the modifier.
According to claim 1,
The waterproof sheet, characterized in that the thickness of the carbon fiber layer is 0.1 to 0.3mm.
delete According to claim 1,
The thermoplastic elastomer is a waterproof sheet, characterized in that it is contained in an amount of 20 to 500 parts by weight based on 100 parts by weight of the PE (polyethylene)-based elastomer.
According to claim 1,
The waterproof sheet, characterized in that the thickness of the first waterproof layer is 0.3 to 1.5 mm.
According to claim 1,
A waterproof sheet, characterized in that the second waterproof layer comprises a urethane resin.
According to claim 1,
The waterproof sheet, characterized in that the thickness of the second waterproof layer is 0.1 to 2.0mm.

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