KR101864676B1 - Crack repair and prevention of recurrence tape and repairing method of the same - Google Patents

Abstract

The present invention relates to a waterproof tape for crack repair and reoccurrence prevention and a repairing method capable of reinforcing a crack on a bottom and a bottom surface of a concrete building or the like and performing a waterproof function. According to an embodiment of the present invention, the waterproof tape for crack repair and reoccurrence prevention comprises: an adhesive layer; a first elastic layer; a release layer; and a second elastic layer.

Description

Technical Field [0001] The present invention relates to a crack repair and re-

The present invention relates to a crack repair and reoccurrence prevention tape and a construction method capable of reinforcing a crack or crack in a floor and a bottom wall of a concrete building or the like and performing a waterproof function.

The present invention relates to a crack repair and reoccurrence prevention tape and a construction method.

The invention of this construction method is to repair cracks and repainting cracks to repair cracks generated on the cross-section and surface of concrete structures damaged by biochemical corrosion or deterioration etc. Repair cracks using tape, urethane, The present invention relates to a tape-like crack repair and re-generation prevention tape which is prepared in advance by supplementing the workability in the field where the complementary properties to the tape are lacking.

More specifically, the present invention proposes a new construction method of repairing cracks in concrete, thereby providing a stretchable structure that can prevent cracks from occurring at the places where cracks are generated, thereby improving waterproofness, durability and weatherability The present invention relates to a crack repair and reoccurrence prevention tape capable of applying and adhering a waterproofing agent to a crack of a concrete structure using a tape, a urethane and a sealant.

Generally, concrete floors and walls constituting a building structure cause durability and structural problems due to aging and deterioration phenomenon. The crack width gradually increases with time, And it immediately becomes a cause of corrosion of the reinforcing bars constituting the concrete wall surface. Also, the generated cracks are a direct factor in maintaining the life of the building.

Therefore, various methods have been introduced to increase or restore the durability of cracked concrete floors and walls in recent years. In particular, Korean Patent Laid-Open No. 10-2006-0086901 (a method for manufacturing a treatment agent for preventing corrosion and neutralization of a concrete structure using a mortar containing a water-soluble epoxy having a protective coating formed of an acrylic soft resin, And the maintenance and repair method of the section.

With reference to this publication, it is possible to repair a cracked portion by filling a crack portion generated on a concrete wall surface by preparing a composition comprising a main component and a curing agent composed of a water-soluble epoxy resin as a main component. Even if the above composition is excellent and the crack portion is well filled, if deterioration occurs, a cracking phenomenon occurs between the crack portion and the composition, and rainwater or the like flows in between the crack portion and the composition, There is a disadvantage in providing the cause.

Korean Patent Laid-Open Publication No. 10-2006-0086901 (Method for manufacturing a treatment agent for preventing maintenance and neutralization of a concrete structure using a mortar containing a water-soluble epoxy having a protective coating formed of an acrylic soft resin and for preventing salt corrosion and its repairing method)

The present invention was made to solve the above-mentioned problems. The present invention provides a crack repair agent for a concrete building, which is applied to a crack having a temporary gap by using a sealant or the like to enhance durability and to temporarily expand water or crack Has been used. However, such a crack repair and reoccurrence prevention agent is required to be supplemented because of its durability against long-term use and vulnerability to matrix fluidity and expansion and contraction. The tape is provided with a waterproof tape for crack repair and reoccurrence prevention that has a stretchability and a buffering effect separated from the mother body by complementary action to the expansion and contraction of the crack portion, which prevents crack recurrence for a long period of time by a single construction .

In addition, the existing method of applying the waterproofing agent can prevent the growth or expansion of cracks at once but it can not be a semi-permanent or continuously manageable method or means. It is another object of the present invention to provide a method of constructing a crack repairing and re-generation preventing method or a waterproofing agent holding method that can be used semi-permanently as an alternative to such a method.

In order to achieve the above object, according to one embodiment of the present invention, there is provided a waterproof tape for crack repair and reoccurrence prevention, wherein waterproof tape for crack repair and reoccurrence prevention is provided. A first stretchable layer comprising urethane, a sealant, an asphalt sheet, and a rubber having good stretchability formed on the adhesive layer, and a second stretchable layer formed on the first stretchable layer, And at least one sealant selected from urethane, silicone, modified sealant and polysulfide; A filler, a binder resin, a hollow inorganic filler, and a resin microballoons, wherein the filler includes one or more selected from the group consisting of aluminum hydroxide, magnesium hydroxide, talc, and fly ash, Wherein the resin microballoons comprise at least one kind selected from the group consisting of polybutene oil, liquid polybutadiene, liquid styrene butadiene rubber, liquid chloroprene rubber, and liquid isoprene rubber, A stretch putty comprising one or more kinds selected from the group consisting of an acrylonitrile resin, a phenol resin, and a vinyl chloride ladder as a resin constituting the outer periphery of the resin microballoons; A sealant, and at least one selected from oil, butyl and acrylic And a second elastic layer including a caulking member on the second elastic layer, wherein the surface is protected from external rust dross made of a rust-reactive solid material having a coating-forming body and a water solubility of 0.1 g / l or more, and benzophenone An ultraviolet light stabilizer that selectively combines at least one selected from the group consisting of benzotriazole, nickel compounds, arylester, benzoate, and hydroperoxide decomposer, Wherein the film-forming assembly comprises an alkyd resin, an epoxy resin, an oleoresin, a chlorinated rubber, a vinyl resin, a polyurethane, a polyester, an organic or inorganic silicate, a polyamide or an acrylic polymer.

In one embodiment of the present invention, the first stretchable layer is previously combined and manufactured and supplied to the site, the second stretchable layer and the upper paint layer are supplied in the field, and the adhesive forming the adhesive layer is supplied in the field And the second stretchable layer and the upper paint may be formed on the surface where cracks or cracks are formed.

The method of the present invention comprises the steps of: (a) removing a composite film or concrete debris generated on a surface of a crack generated in a building in a preparation process to form a smooth surface; (B) forming a primer layer by coating an acrylic resin primer in a liquid state to stabilize a crack part arranged in the preparation step; (c) (D1) heating and curing the adhesive at a temperature lower than the firing point by using a heater on the crack generation surface (surface including the crack point) (step s130); And (e) adhering the pre-manufactured first stretch layer to the cracking surface (s140).

In one embodiment of the present invention, the adhesive includes at least one selected from epoxy resin, acrylic resin and urethane, and the adhesive layer may be cured by an infrared heater.

According to an embodiment of the present invention having the above-described structure, it is possible to prevent the safety measures of the building caused by the secondary measures such as post-processing or construction on the floor and bottom wall surfaces of the conventional building, Can be greatly reduced.

In addition, since the tapes are manufactured in a pre-manufactured form and only the attaching process is performed in the field, there is an advantage in terms of stability and durability of the construction due to the change of the compounding ratio in the field, There is an advantage in not using the subsequent process according to the construction error in the field.

FIG. 1 is a view showing a state where a crack is generally generated.
2 is a view showing a primer layer formed on a concrete structure matrix including a crack according to an embodiment of the present invention.
3 is a perspective view showing a configuration of an infrared ray heater according to an embodiment of the present invention.
4 is a view showing the construction of a waterproof tape for preventing cracks and reoccurrence of cracks according to an embodiment of the present invention.
FIG. 5 is a view showing the construction of a waterproof tape for preventing cracks and reoccurrence of cracks according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it is not necessarily the case that it is "directly connected", but also includes the case where it is "indirectly connected" do. Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, the construction of a waterproof tape for preventing cracks and reoccurrence according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Generally, concrete buildings consist of reinforced concrete reinforced concrete with excellent durability and compressive strength.

In other words, the reinforced concrete structure is a structure method that combines strong concrete with strong compressive force and strong reinforcing bar with tensile strength and rationally compensates the inherent characteristics of each material. Alkaline concrete forms a passive film on the reinforcing bar to inhibit the progress of corrosion. It is an excellent structure that can be taken over a year.

The concrete structure is an efficient building material that combines the characteristics of each material. However, as the air pollution due to global warming becomes more intense in recent years and the environmental change becomes bigger due to the global warming, the concrete building becomes more vulnerable to acid rain, Gas, and redevelopment projects, the concrete buildings are rapidly deteriorated or affected by the deterioration phenomenon, thereby reducing the durability of the buildings.

The deterioration of the concrete structure promotes the deterioration phenomenon as well as the detachment of the coating film, which may cause cracks in the concrete structure. When cracks occur, cracks spread like a domino phenomenon.

The deterioration phenomenon also causes the concrete to be neutralized (carbonated) and corrodes the reinforcing bars. Generally, the neutralization of concrete buildings progresses gradually, but there is no big problem, but rainwater or other contaminants enter cracks due to cracks, thereby accelerating the neutralization and accelerating the corrosion of steel bars. Furthermore, when water penetrates into the cracked portion, bacterial growth such as fungi and erosion are caused.

In order to repair and reinforce the cracks occurring in concrete buildings, it is necessary not only to apply cracks by crack repair materials, but also to apply the rustproofing and antimicrobial coatings and the water paint which is finally applied after completion of the boss coating It is essential to propose a crack repair method considering adhesion.

On the other hand, since the bottom and bottom wall surfaces of concrete structures such as apartment houses or apartments are painted with water paint, they have been used to repair cracks in outer walls using crack repair agents, which mainly contain solvents such as epoxy and urethane .

However, the proposed method has not been able to propose a long - term maintenance method which can prevent long - term and permanent waterproofing, rust prevention and rust.

Therefore, it is basically required to provide a stretchable layer which can be sustained for a long period of time after the pretreatment process for the cracked region, in addition to that, the paint to be finally applied and the properties having properties suitable thereto are required.

The method for repairing cracks in a floor and a bottom wall of a building and for waterproofing a floor includes the steps of (a) preparing a composite film, concrete fragments, and the like generated on a surface of a crack (12) (Step S100) so as to have a smooth surface.

FIG. 1 is a view showing a state where a crack is generally generated.

Referring to FIG. 1, when a crack fissure is generated with respect to the crack 12, stress concentration occurs in the crack tip, and crack propagation is facilitated. Therefore, as a countermeasure against this, it is necessary to supplement the portion where the stress can be concentrated, and at the same time, to elastically compensate the widened portion. Before doing this procedure, it is necessary to carry out the work that needs to be carried out first, and to arrange and arrange for the crack occurrence part. In order to carry out this process, first, surface treatment may be required as a pretreatment process.

In this case, it is preferable to use a hand grinder to precisely remove the old film, concrete fragments and the like in order to have a smooth surface with respect to the surface of the crack portion by using a machine tool such as a hera, iron brush or a grinder Do.

In the second coating step (s110), a primer layer 20 is formed by applying a liquid acrylic resin primer to stabilize the portion of the crack 12 arranged in the preparation step. The application of the acrylic resin primer is sufficient for a single application but it is necessary to apply more than two complete coatings after complete drying in case of one application and to apply a more perfect concrete base and spray or brush brush, etc.).

2 is a view showing a primer layer formed on a concrete structure matrix including a crack according to an embodiment of the present invention.

Referring to FIG. 2, the primer layer 20 may be formed on the surface of the cracked mother body.

When the above process is performed, basically, the stress on the crack tip portion can be relaxed, and at the same time, the crack portion can be prevented from being widened due to advancement of the crack.

Particularly, in the case of the waterproof tape for preventing crack repair and re-generation of cracks according to the present invention, since providing a means for removing additional stress from cracks is a basic tool for the basic crack diffusion prevention mechanism, the first and second elastic layers 120, and 130, it is basically necessary to form a spaced surface between the surface including the crack and the crack repair and recurrence preventing waterproof tape 100 according to one embodiment of the present invention The release layer 115 can be formed. It is possible to prevent the crack from spreading through the fissure portion of the crack through the release layer 115 as described above.

It is preferable to provide a waterproof tape 100 for preventing cracks and reoccurrence of cracks according to an embodiment of the present invention after having a preventive mechanism against crack extension (acrylic resin primer + release layer).

In order to perform the repair of cracks of the concrete structure in this way, a process (S120) of applying an adhesive may be required.

In order to perform such a role, the adhesive may use various chemicals, but mainly includes at least one of an epoxy resin, an acryl resin and a urethane.

The epoxy resin refers to a thermosetting resin produced by polymerization of a dendritic substance having two or more epoxy groups in a molecule and an epoxy group, and has a specific gravity of 1.230-1.189, a bending strength, It is excellent in physical properties such as hardness, has no characteristic of generation of volatile substances and shrinkage in volume at the time of curing, and has a large adhesive force on the material surface when cured.

The acrylic resin refers to a polymer from esters such as acrylic acid and methacrylic acid. All of the plate products and the molding materials are thermoplastic and can be molded into various shapes and molded articles having almost any shape can be obtained. The acrylic resin is excellent in chemical resistance, It is characterized by excellent water resistance.

In the case of urethane, it refers to a synthetic polymer having a urethane bond, and is used as a main raw material for an adhesive as a polyurethane-based synthetic fiber. Therefore, an adhesive is formed and used such that at least one of epoxy resin, acrylic resin, and urethane is included, so that the bonding strength of the waterproof crack tape 100 to the crack or cracked portion can be increased.

When the adhesive is applied and cured, the adhesive layer 110 can be formed. In order to form the adhesive layer 110, the following process may be performed.

That is, a step of curing the adhesive by heating the adhesive to a temperature lower than the firing point using a heater may be performed on the crack generating surface (the surface including the crack point) (s130).

This is because when the adhesive is heated by the heater 160, the adhesive layer 110 made of the adhesive is cured in a short time and cured. Therefore, the curing by the short-term curing of the adhesive layer 110 can be carried out at the bottom and the bottom of the concrete structure It is possible to quickly shorten the construction period for the mother portion including cracks on the wall surface.

3 is a perspective view showing a configuration of an infrared ray heater according to an embodiment of the present invention.

Referring to FIG. 3, it is possible to form a bonding layer 110 according to an embodiment of the present invention and cure the adhesive layer 110 by heating before attaching the waterproof cracked tape 100 manufactured in advance.

3, when the infrared heater 160 is used in the curing step, a heating body 61, which radiates heat when the power is supplied to the operating body 60, The upper surface of the heat generating body 61 is coupled with a shielding plate 62 for guiding the radiated infrared rays toward the lower direction.

When the adhesive layer 110 is coated with the adhesive, the repair surface containing the adhesive layer 110 is heated by the infrared heater 160, (S140) of adhering the waterproof tape for preventing recurrence can be performed.

The first stretchable layer 120 may be preformed and then adhered to the adhesive layer 110. After attaching the first elastic layer 120 to the adhesive layer 110 so as to include the release layer 115, the second elastic layer 130 can be manufactured in situ. The second stretchable layer 130 thus manufactured may be bonded onto the first stretchable layer 120 through an adhesive material.

Examples of the adhesive material used herein include animal (casein, glycogen), vegetable (lacquer, grass), and synthetic resins such as thermoplastic (thermoplastic; epoxide resin, phenol resin)

The first stretchable layer 120 capable of performing the function of the waterproof crack tape 100 may be rolled up before bonding through the adhesive layer 110.

FIG. 4 is a view showing the construction of a waterproof tape for preventing cracks and reoccurrence, which can cover a crack portion of a floor and a bottom wall of a concrete structure according to an embodiment of the present invention.

Referring to FIG. 4, the crack repair and reoccurrence prevention waterproof tape 100 may be finished with an upper paint layer 140 as a paint layer, or may be completed as an intermediate step as in the case of forming a new layer.

The step of applying the adhesive to the crack occurrence point of the concrete structure is performed by applying the acrylic resin primer in the liquid state to stabilize the part of the crack 12 arranged in the preparing step which is the applying step s120, It may be desirable to proceed after formation and drying.

The waterproof cracked tape 100 previously manufactured on the concrete structure with respect to the adhesive layer 110 may include a first elastic layer 120. The first elastic layer 120 may be disposed on the bottom and the bottom of the concrete structure, The process of forming the second stretchable and contractible layer 130 and the upper paint layer 140 may be performed after the attachment work to the wall surface is completed.

The first extensible layer 120 includes 20-40 wt% urethane, 20-40 wt% sealant, 40-60 wt% asphalt sheet, 5-10 wt% rubber with elasticity, 5-10 wt% paper and 5-10 wt% vinyl can do. The rubber having elasticity may be intended to supplement the crack extending action occurring at the above-mentioned crack occurrence point. As the rubber having elasticity, an artificial rubber may be used. Herein, artificial rubber refers to a rubber chemically synthesized using acetylene or the like as a raw material, and is superior in oil resistance and heat resistance as compared with natural rubber. In particular, artificial rubbers can be manufactured to have various properties depending on raw materials and manufacturing methods.

Particularly, the crack repair and recurrence prevention waterproof tape 100 including the first stretchable layer 120, which is an embodiment of the present invention, includes a release layer 115 between the mother surface including the crack 12 . Such a release layer 115 can smoothly expand and contract between the waterproof tape 100 and the crack repairing and reoccurrence preventing tape 100 having elasticity and buffering effect.

In particular, since the first stretchable layer 120 having elasticity has a characteristic of being able to be bent, it can be a resistance means against external stresses after an adhesive action with the adhesive layer 110 formed in the middle of the cracks 12 have.

The sealant is a product to be used for a joint having an elongation allowance of ± 10% or more, and may be a silicone type, a modified silicone type, a polysulfide type, or the like. Such a sealant refers to a material which fixes a glass or the like other than a joint between various members or a joint or a joint which is filled with water to give waterproof airtightness of the joint.

In addition, the asphalt sheet is impregnated or coated with straight asphalt, APP (Atactic Polypropylene) or SBS (styrene Butadiene styrene) on a core material such as a short fiber nonwoven fabric, a stretched film and an unleavened film, and is currently used for waterproofing of a rooftop sleeve .

In addition, the second stretchable layer 130 according to an embodiment of the present invention may include 20-40 wt% of urethane, 20-40 wt% of sealant, 20-40 wt% of putty, 20-40 wt% of sealing agent and 15-20 wt% of caulking member. . ≪ / RTI >

 The putty is used to fill the opening or to prevent the gap in combination with a non-flammable board such as a calcium silicate board. The putty may include a filler, a binder resin, a hollow inorganic filler, and a resin microballoons coated with an inorganic powder. The resin microballoons coated with the hollow inorganic filler and the inorganic powder may be provided for weight reduction. By lightening the putty, it is possible to lighten the weight of the waterproof tape 100 for preventing crack repairs and reoccurrence according to an embodiment of the present invention.

The filler may include any one or more selected from the group consisting of aluminum hydroxide, magnesium hydroxide, talc, and fly ash. The binder resin may include one kind or two or more kinds selected from the group consisting of polybutene oil, liquid polybutadiene, liquid styrene butadiene rubber, liquid chloroprene rubber, and liquid isoprene rubber. Wherein the hollow inorganic filler comprises at least one of fly ash balloon, pearlite and Saras balloon, and the resin constituting the shell of the resin microballoons is a group consisting of acrylonitrile resin, phenol resin, vinylidene chloride Or two or more kinds selected from among the above.

The sealing material refers to a sealing material having a rubber elasticity as a mechanical property after curing. This is also referred to as an elastic sealing material. It is a mixture of a mineral filler and a plasticizer uniformly mixed with a liquid rubber such as corosulfide, silicone, and polyurethane, and exhibits rubber-like elasticity after curing. Such elastic sealing materials can be used for walkie joints where movement occurs.

The caulking member refers to a material filled in joints or cracks of various auxiliary materials to maintain watertightness and airtightness. It can be used for the purpose of improving the durability of the building by fixing the member with excellent adhesion and elasticity to the member. Caulking members include bituminous materials (a kind of petroleum products), and silicon is the most representative of these nowadays.

The caulking member may be made of one or more materials selected from oil, butyl and acrylic.

The upper paint layer 140 may be formed on the second elastic layer 130.

Paint is being treated on the surfaces of buildings and other structures exposed to the atmosphere to improve weather resistance and to obtain a plaster effect. Such a building may be damaged due to external rust. It can be said that the top paint according to an embodiment of the present invention is used to minimize the damage caused by the rust damage. The top paint according to one embodiment of the present invention may be a film-forming binder and a solid material having a water solubility of at least 0.1 g / l and capable of reacting with rust. The topcoat of the present invention may be one that can chelate iron.

In addition, the top paint layer 140 of the present invention may include an ultraviolet screening agent. The ultraviolet light blocking agent may be selected from benzophenone, benzotriazole, nickel compounds, arylester, benzoate, and hydroperoxide decomposer, or a combination of two or more thereof. , The ultraviolet rays are blocked or absorbed to prevent deterioration of physical properties, and durability can be improved.

The film-forming assembly may include an alkyd resin, an epoxy resin, an olefin resin, a chlorinated rubber, a vinyl resin, a polyurethane, a polyester, an organic or inorganic silicate, a polyamide or an acrylic polymer.

In addition, the second waterproof crack tape 100A according to another embodiment of the present invention may further include a heterogeneous layer without containing a paint coat.

To this end, the second crack repair and reoccurrence prevention waterproof tape 100A may include a third elastic layer 125 including a urethane, a sealant, an asphalt sheet, and a rubber having good elasticity (for example, the above- May be formed. Other layers may be accumulated in the upper layer of the third elastic layer 125 of the second crack repair and regeneration prevention waterproof tape 100A. Through these different layers, various functions can be given.

Such a second crack repair and reoccurrence prevention waterproof tape 100A can also be rolled up and carried around to ensure convenient mobility.

5 is a cross-sectional view showing a waterproof tape for preventing cracks and reoccurrence according to another embodiment of the present invention attached to a matrix of a concrete structure.

5, it can be seen that the adhesive layer 110 is formed with the point where the crack 12 is formed with respect to the matrix 10 of the concrete structure, and then the third stretchable layer 125 is attached . Through such a process, it is possible to easily repair the cracking point of the concrete structure 10 of the concrete structure according to another embodiment, and to add a new layer having additional functions.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

10: matrix of concrete structure 12: crack
20: primer layer 60: operating body
61: heat generating body 62:
100: Water repellent tape for crack repair and reoccurrence
100A: waterproof tape to prevent the second crack repair and reoccurrence
110: adhesive layer 115: release layer
120: first elastic layer 125: third elastic layer
130: second stretch layer
140: Top paint layer
160: Infrared heater

Claims (4)

In a crack repair and reoccurrence prevention tape,
Two spaced apart adhesive layers including at least one selected from epoxy resin, acrylic resin and urethane having strong adhesiveness with a point where a crack occurs;
A first elastic layer formed on the adhesive layer, the first elastic layer including urethane, a sealant, an asphalt sheet, a rubber having good elasticity, paper, and vinyl;
A release layer formed below the first elastic layer and formed between the adhesive layers;
A second elastic layer formed on the first elastic layer and having at least one selected from urethane, silicone, modified silicone and polysulfide,
A filler, a binder resin, a hollow inorganic filler, and a resin microballoons,
Wherein the filler comprises one kind or two or more kinds selected from the group consisting of aluminum hydroxide, magnesium hydroxide, talc and fly ash,
Wherein the binder resin contains one kind or two or more kinds selected from the group consisting of polybutene oil, liquid polybutadiene, liquid styrene butadiene rubber, liquid chloroprene rubber, and liquid isoprene rubber,
Wherein at least a part of the surface of the resin microballoons is coated with an inorganic powder, and the resin constituting the outer periphery of the resin microballoons is one kind selected from the group consisting of acrylonitrile resin, phenol resin and vinylidene chloride or Putty containing two or more kinds,
Rubber sealing materials and
A second elastic layer including a caulking member including silicon,
On the second stretching layer, any one selected from the group consisting of a film-forming complex and benzophenone, benzotriazole, a nickel compound, an arylester, a benzoate, and a hydroperoxide decomposer An upper paint layer comprising an ultraviolet light stabilizer to selectively combine two or more layers,
Wherein the film-forming assembly comprises an upper paint layer comprising an alkyd resin, an epoxy resin, a chlorinated rubber, a vinyl resin, a polyurethane, a polyester, an organic or inorganic silicate, a polyamide or an acrylic polymer. Waterproof tape.
delete delete delete

Images