KR101810894B1 - Adhesive composition for connecting pipe, method for manufacturing thereof and method for connecting pipe using the same - Google Patents

Abstract

The present invention relates to an adhesive composition for connecting pipes, a manufacturing method thereof and a method for connecting pipes using the same. The adhesive composition used for connecting plastic pipes when installing or repairing (replacing) a fire pipe or the like comprises: an adhesive solvent dissolving the surface of a plastic pipe; and a plastic dissolved in the adhesive solvent. The viscosity of the adhesive composition is 500 to 1,200 cP. According to the present invention, the adhesive composition has excellent adhesion and leakage prevention, and high economic feasibility and can easily connect pipes with a simple method.

Description

TECHNICAL FIELD [0001] The present invention relates to an adhesive composition for piping connection, a method of manufacturing the same, and a connection method of piping. [0002]

The present invention relates to a bonding composition for piping connection, a method for producing the same, and a connecting method for piping, and more particularly, to a bonding composition used for connecting piping at the time of installation or repair (replacement) The present invention relates to a bonding composition for pipe connection, which has water-repellency, as well as high economic efficiency, a method for producing the same, and a method for connecting pipes using the adhesive composition.

Piping provides a flow path for fluid, which is widely used in various industries. Pipes have various sizes (diameter and length) and shapes, depending on the industry to which they are applied. In most cases, they are cylindrical and made of plastic or metal. For example, in the case of fire extinguishers, mainly cylindrical plastic re-piping is used for corrosion resistance and light weight. The piping for fire-extinguishing facilities is either buried in a building or embedded in a concrete wall or exposed to the outside, which is divided into a main pipe, an inlet pipe, and a branch pipe branched from the main pipe or the upstream pipe.

Generally, the connection between the pipes is made by a connecting device such as a joint pipe and an assembling member, and various tools. For example, when connecting a main pipe to a branch pipe in a fire extinguishing facility, the main pipe and the branch pipe are inserted into a joint pipe such as a T-shaped pipe, and then connected through bolts or the like. Also, when connecting pipes, the confidentiality of the connecting parts must be ensured. For this purpose, in most cases, sealing materials such as O-rings are packed.

For example, Korean Patent Publication No. 10-1190837, Korean Patent Publication No. 10-2009-0004408, and Korean Utility Model Publication No. 20-2013-0004571 disclose techniques related to the above.

However, the conventional piping connection has a problem that the number of components of the connection device and the number of tools used are large, which requires a long operation. Further, when a sealing material such as an O-ring is used for airtightness, it is difficult to completely ensure airtightness due to aging. In this case, for example, when high-pressure fire water flows as in a fire extinguishing facility, there is a problem that leakage occurs and breaks on the connection portion.

Korean Patent Registration No. 10-1190837 Korean Patent Publication No. 10-2009-0004408 Korean Utility Model Publication No. 20-2013-0004571

Accordingly, the present invention provides a bonding composition for pipe connection, a method for producing the same, and a connection method for pipes, which have excellent adhesiveness and water-repellency as well as high economic efficiency. There is a purpose.

According to an aspect of the present invention,

Claims [1] A bonding composition for piping connection for connection of a plastic re-pipe,

A bonding agent for dissolving the surface of the plastic re-pipe; And

A plastic dissolved in the bonding agent,

And a viscosity of 500 to 1,200 cP.

In addition, the adhesive composition for pipe connection according to the present invention may further include at least one selected from polyvinyl acetate (PVA) and a thickener.

Further, according to the present invention,

A first step of obtaining waste plastic powder obtained by pulverizing a waste pipe;

A second step of dissolving the waste plastic powder in the bonding solvent by mixing a bonding agent for dissolving the surface of the pipe and the waste plastic powder obtained in the first step and applying heat thereto; And

And a third step of filtering the solution obtained in the second step to remove the solids contained in the solution.

The present invention also provides a piping connection method including a step of applying and bonding the adhesive composition for pipe connection to the surface of a pipe.

INDUSTRIAL APPLICABILITY According to the present invention, piping can be connected by a simple method through application of an adhesive composition, minimizing the use of assembling parts and tools, and having an excellent adhesive property and waterproofing property. In addition, it has a high economic efficiency due to the recycling of waste resources (waste piping) and has environment-friendly effects.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a process diagram for explaining a piping connection method according to a first embodiment of the present invention. FIG.
2 is a process diagram for explaining a piping connection method according to a second embodiment of the present invention.
3 is a cross-sectional view of a piping connection portion connected by a piping connection method according to a second embodiment of the present invention.
4 is a photograph showing a tensile strength test according to an embodiment of the present invention.
Fig. 5 is a photograph of a connected specimen after tensile strength test according to an embodiment of the present invention. Fig.
FIG. 6 is a photograph of a connected specimen after a fracture test according to an embodiment of the present invention. FIG.

The term "and / or" used in the present invention is used to mean at least one of the constituents listed before and after. As used herein, the term "one or more" means one or more than one. In the present invention, the terms "first", "second", "third", "one side" and "other side" are used to distinguish one element from another, And the like.

According to a first aspect of the present invention, there is provided an adhesive composition for connecting pipes, which has at least excellent adhesion and water-repellency as an adhesive for connecting pipes. According to a second aspect of the present invention, there is provided a process for producing the adhesive composition for connecting a pipe, which has, for example, high economic efficiency. According to a third aspect of the present invention, there is also provided a method of connecting a pipe using the adhesive composition for pipe connection.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings illustrate exemplary embodiments of the invention and are provided to aid in the understanding of the invention only. In the accompanying drawings, the thickness may be enlarged to clearly show each layer and the area, and the scope of the present invention is not limited by the thickness, the size and / or the ratio of each component shown in the drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the embodiments of the present invention, detailed description of known functions and configurations will be omitted. Hereinafter, a method for connecting piping according to the present invention will be described, and a bonding composition for piping connection according to the present invention and a method for manufacturing the piping connection composition will be described.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a process diagram for explaining a piping connection method (hereinafter abbreviated as "connection method") according to a first embodiment of the present invention. FIG. FIG. 3 is a cross-sectional view of a piping connection portion connected by a connection method according to a second embodiment of the present invention. FIG.

[1] First Embodiment

1, a connecting method according to the present invention is a method of connecting a pipe bonding adhesive composition S according to the present invention to surfaces 10a and 20a of pipes 10 and 20 according to a first embodiment, (Hereinafter, abbreviated as "adhesive composition").

1, when the first pipe 10 and the second pipe 20 are connected to each other, at least one of the first pipe 10 and the second pipe 20 is bonded to the adhesive composition S ), And the adhesive composition (S) is applied to the surfaces (10a) and (20a) of these connecting portions. For example, an appropriate amount of the adhesive composition S is applied to the outer surface 10a of the first pipe 10 and / or the inner surface 20a of the second pipe 20. FIG. 1 illustrates a state in which the adhesive composition S is applied to one outer surface 10a of the first pipe 10. Thereafter, the first pipe 10 and the second pipe 20 are sandwiched, and then the adhesive composition S is cured (dried) to be connected (bonded). The curing (drying) of the adhesive composition (S) may be selected from natural curing at room temperature (natural drying) and / or thermal curing using heat such as hot air or a heater.

In the present invention, the pipes 10 and 20, that is, the first pipe 10 and the second pipe 20 can provide a fluid flow path, but it is not particularly limited as long as it is a plastic re-pipe. The first pipe 10 and the second pipe 20 are plastic materials and may have a shape such as a cylindrical shape or a polygonal shape. In the drawing, cylindrical pipes 10 and 20 are illustrated.

In addition, the first pipe 10 and the second pipe 20 may be selected from a length pipe (straight pipe) and / or a connection pipe connected to the length pipe. At this time, the length pipe has a predetermined length, which means that the fluid flows in the longitudinal direction of the pipe (10) (20) (for example, a rectilinear pipe that flows in a straight line). The connection pipe is a pipe connected to the above-mentioned length pipe, which can be selected from a pipe for changing the direction of the flow path, changing the flow rate and / or branching the flow path.

According to one embodiment, the first pipe 10 may be selected from a length pipe (straight pipe) having a predetermined length as illustrated in the drawing. The second pipe 20 is not particularly limited as long as it is connected to the first pipe 10 and may be a length pipe (straight pipe) having an inner diameter equal to or greater than the outer diameter of the first pipe 10, (22) and (23), as shown in Fig. In the drawing, the second pipe 20 is a joint pipe.

The second pipe 20 can be selected from a joint pipe having two or more joints 21, 22 and 23. In the figure, three joints 21, 22, Shaped T-joint pipe. That is, in the drawing, a T-shaped joint pipe having the first joint 21, the second joint 22 and the third joint 23 as the second pipe 20 is illustrated. Here, the joint pipe as the second pipe 20 includes a first joint 21 having an inner diameter equal to or greater than the outer diameter of the first pipe 10, and the first joint 21, One side of the base 10 can be inserted and connected. As described above, the adhesive composition S is applied to one outer surface 10a of the first pipe 10 and / or the inner surface 20a of the first joint 21, 10 and the first joint 21 may be connected to each other through adhesion.

According to a preferred embodiment, the adhesive composition (S) is applied to at least one outer surface (10a) of the first pipe (10) with a predetermined width. The adhesive composition S can be optionally applied also to the inner surface 20a of the second pipe 20 or to the inner surface 20a of the first joint 21. [ In the present invention, the method of applying the adhesive composition (S) is not particularly limited. The adhesive composition (S) may be applied by, for example, a method of applying (such as brushing) and / or spray coating. Further, the spray gun G (see Fig. 2) can be used for applying the adhesive composition (S).

In the present invention, the first pipe 10 and the second pipe 20 are plastics pipes which are formed by using plastic (synthetic resin) as a main material, as mentioned above, and they are rigid And includes a flexible one. The first pipe 10 and the second pipe 20 may be formed of a chlorinated polyvinyl chloride pipe (hereinafter referred to as a "CPVC pipe"), a polyvinyl chloride pipe (Hereinafter referred to as " PE tube ") and / or polypropylene (hereinafter referred to as " PE tube ") having polyvinyl chloride as a main material, polyvinyl chloride (Hereinafter referred to as "PP tube") having polypropylene as a main material, and the like.

According to one embodiment, the first pipe 10 and the second pipe 20 may be selected from fire extinguishing pipes used in a fire extinguishing facility. In this case, the present invention can be usefully applied to the connection of fire extinguishing pipes in the installation or maintenance (replacement) work of fire extinguishing pipes in fire extinguishing facilities. The first pipe 10 and the second pipe 20 may be selected from a CPVC pipe and / or a PVC pipe which are widely used as fire extinguishing pipes. The first pipe 10 and the second pipe 20 may be made of the same material. For example, when the first pipe 10 is a CPVC pipe, the second pipe 20 may be a CPVC pipe.

[2] Second Embodiment

2 and 3, the connecting method according to the present invention is a method of forming a waterproofing layer 30 on the outer surface of the connecting portion A of the pipe 10 (20) according to the second embodiment . Specifically, in the connecting method according to the second embodiment of the present invention, the bonding composition S is applied to the surfaces 10a and 20a of the first pipe 10 and / or the second pipe 20 to be connected And a second step of forming the water leakage preventing layer 30 on the outer surface of the connecting portion A between the first pipe 10 and the second pipe 20 connected through the first step, .

The first step is the same as the first embodiment. The second step is a step of forming a water leakage preventing layer 30 on the outer surface of the connecting portion A between the first pipe 10 and the second pipe 20. In the present invention, It is not particularly limited as long as it can prevent leakage. That is, in the present invention, the water leakage preventing layer 30 is formed so as to cover the outer surface of the connecting portion A of the first pipe 10 and the second pipe 20 as shown in FIG. 3, It is good.

The leakage preventing layer 30 may be formed by applying a resin composition. Further, the resin composition for forming the water leakage prevention layer 30 may have foamability. Specifically, in the present invention, the water leakage preventing layer 30 may be composed of a resin film layer formed by applying and curing a resin composition, or may be formed of a foamed foam layer formed by foaming of a foamable resin composition. The waterproofing layer 30 may preferably be formed by applying the adhesive composition S according to the present invention to a predetermined thickness and then curing (drying). When the waterproofing layer 30 is formed of the adhesive composition S according to the present invention, the adhesive force (bonding force) between the first pipe 10 and the second pipe 20 is improved .

According to the present invention described above, the pipes 10 and 20 can be firmly connected (bonded) by a simple method by applying the adhesive composition S when connecting the pipes 10 and 20. Specifically, according to the present invention, the pipe 10 (20) is coated with the adhesive composition (S) by applying / curing the adhesive composition (S) without using many assembly parts or tools for connecting the pipes It is easy to connect with a simple method.

In addition, the adhesive composition (S) according to the present invention improves workability and the like as well as excellent adhesive property and waterproofing property as described below. In addition, according to an exemplary embodiment, recycling waste resources (waste piping) as described below is highly economical and environmentally friendly.

[3] Adhesive composition (S)

The bonding composition S according to the present invention is characterized by comprising a bonding agent S1 for dissolving the surfaces 10a and 20a of the pipes 10 and 20 and a plastic S2 for dissolving the bonding agent S1, . According to the present invention, the plastic S2 is dissolved in the bonding agent S1 and acts as a main adhesive for connecting (adhering) the pipes 10 and 20, and the bonding agent S1 is bonded to the pipe 10) 20 are melted to improve the adhesive strength. That is, the bonding agent S1 causes the dissolution liquid to dissolve the surfaces 10a and 20a of the pipes 10 and 20 so that the dissolving liquid acts as an auxiliary adhesive, ) 20 and the plastic (S2) dissolution liquid is formed to improve the adhesive strength. In addition, the adhesive composition (S) has a viscosity of 500 to 1,200 cP (ceti-poise; centipoise) according to the present invention.

The bonding solvent S1 is a hydrocarbon-based organic solvent which is applied to the pipes 10 and 20 to dissolve the surfaces 10a and 20a of the pipes 10 and 20, Is dissolved. In the present invention, the bonding agent (S1) is not particularly limited as long as it has the above-mentioned function (dissolution power). Specifically, in the present invention, the bonding solvent S1 is not particularly limited as long as it has a dissolving power for the pipes 10 and 20 and the plastic S2, It can be selected from appropriate ones according to the material (kind).

The bonding solvent (S1) may preferably be selected from organic solvents such as furan-based and / or ketone-based solvents. In the present invention, the furan system may be any furan system. Specifically, the furan system includes a 5-membered heterocyclic compound (C ₄ H ₄ O) having 1 oxygen atom (O) in the ring, and the heterocyclic compound (C ₄ H ₄ O) Furan, and derivatives thereof, and the like.

The furan system may be at least one selected from the group consisting of tetrahydrofuran (THF), dihydrofuran (DHF), derivatives thereof, and the like. The ketone system may include at least one selected from the group consisting of acetone, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and butyl methyl ketone (BMK) Can be used.

The bonding agent (S1) may be a mixture of one or more selected from furan and / or ketone-based organic solvents as described above. Preferably, the bonding agent (S1) includes at least one furan- good. More preferably, it includes at least tetrahydrofuran (THF).

As mentioned above, in the present invention, the pipe 10 (20) is a plastic material, which can be selected from a CPVC pipe or a PVC pipe. According to an experimental study of the present invention, it was found that the tetrahydrofuran (THF) has higher dissolving power for CPVC and PVC than other organic solvents such as a ketone-based solvent. Also, tetrahydrofuran (THF) has low boiling point and high volatility. Accordingly, tetrahydrofuran (THF) dissolves the surfaces 10a and 20a of the CPVC tube or the PVC pipe in a short time to improve the adhesive strength. In addition, since the volatility is high, the working time, Drying) time can be remarkably shortened.

The above-mentioned bonding agent (S1) may be a mixed solvent obtained by mixing a furan-base and a ketone base. At this time, a furan system can be used as a main solvent, and a ketone system can be used as an auxiliary solvent. As described above, the furan system such as tetrahydrofuran (THF) has a very high dissolving power for CPVC and PVC. However, the furan system is somewhat expensive. Therefore, in view of economical efficiency, it may be mixed with a ketone such as acetone or methyl ethyl ketone (MEK) which is inexpensive and used. When the fusing solvent (S1) is used in the form of a mixed solvent of furan and ketone, it is mixed and used in a weight ratio of 80 to 88: 2 to 10 (furan: ketone = 80 to 88: 2 to 10) It is good to do. At this time, if the amount of the ketone-based compound is too small, the effect of improving the economical efficiency due to the mixing use thereof may be insignificant. If the amount of the ketone-based solvent is too large, the viscosity may increase, or the adhesiveness may deteriorate due to a decrease in the amount of the furan-based (THF, etc.) used. That is, if the furan content (THF or the like) is too small, the adhesiveness may be deteriorated due to a decrease in surface solubility of the pipes 10 and 20.

The plastic S2 is dissolved by the bonding agent S1 and acts as a main adhesive for connecting (adhering) the pipes 10 and 20 as mentioned above. In the present invention, the plastic S2 is not particularly limited as long as it is dissolved by the bonding agent S1 and has an adhesive force. The plastic S2 may be selected from plastic (synthetic resin) of the same kind as the material of the preferable pipe 10 (20). The plastic S2 may be selected from, for example, CPVC, PVC, PE and / or PP, among which CPVC and PVC may be preferably selected.

In addition, the plastic S2 is selected from CPVC and PVC as described above, and powder having a predetermined particle size can be used. The powdery plastic S2 is dissolved in the bonding agent S1 and is present in a liquid state in the adhesive composition S. In addition, the plastic S2 can be separated from the waste piping in consideration of economy and environmental friendliness. For example, a waste plastics powder obtained by pulverizing a waste CPVC pipe and / or a waste PVC pipe or the like can be used as a waste pipe disused in a digestion facility.

The bonding composition (S) according to the present invention is a liquid phase comprising the bonding agent (S1) and the plastic (S2) as described above, which also has a viscosity of 500 to 1,200 cP as described above. In the present invention, the viscosity is a value measured at room temperature. Further, in the present invention, the ambient temperature may vary depending on the season, but it may be in the range of, for example, -25 캜 to 40 캜. The viscosity may be a value measured at the temperature of the work site at the time of connection of the pipe 10 (20), specifically, for example, a value measured at a temperature of -15 캜 to 35 캜.

In the present invention, the viscosity of the adhesive composition (S) may act as an important factor for workability (coatability), adhesiveness and waterproofing property. Specifically, when the viscosity of the adhesive composition (S) is less than 500 cP and is too low, the flowability is high during application to the pipes 10 and 20, for example, The adhesion may be low. At the same time, an unapplied portion due to a human error may occur. When the viscosity of the adhesive composition (S) exceeds 1,200 cP and is too high, the viscosity of the composition is too strong, for example, it may be difficult to perform the coating operation due to poor spreadability. In addition, even if the viscosity is too high, an unapplied portion due to human error may occur.

In the application of the adhesive composition (S), an uncoated portion must not be formed, as well as the formation of a uniform thickness layer over the entire surfaces (10a) and (20a) of the pipes (10) and (20). Particularly, when an uncoated portion is generated, not only the adhesiveness is deteriorated but also the unapplied portion forms a gap and leakage may occur. Accordingly, when applying the adhesive composition S to the surfaces 10a and 20a of the piping 10 and 20, it is very important to prevent unexposed portions from occurring. To this end, the adhesive composition S And has a viscosity of 500 to 1,200 cP. That is, according to the present invention, when the viscosity is 500 to 1,200 cP, the human error is prevented (minimized) and the spreadability (coatability) is excellent, Could know. Considering this point, the adhesive composition (S) preferably has a viscosity of 700 to 1,050 cP, more preferably 800 to 1,000 cP.

The plastic (S2) may be contained in an amount of 5 to 20% by weight based on the total weight of the adhesive composition (S). At this time, when the content of the plastic (S2) is less than 5% by weight, the adhesiveness and the water-repellency are lowered, and the content of the bonding agent (S1) relatively increases, have. If the content of the plastic (S2) is more than 20% by weight, the solubility is deteriorated, the viscosity becomes too high, and the application may be difficult. Considering this point, the plastic (S2) is preferably contained in an amount of 10 to 15% by weight, more preferably 10 to 14% by weight, or 11 to 14% by weight based on the total weight of the adhesive composition (S) . According to a preferred embodiment of the present invention, when the plastic S2 is contained in the range of 10 to 15% by weight (more preferably 10 to 14% by weight, or 11 to 14% by weight) And also has a suitable viscosity, thereby significantly reducing the possibility of occurrence of an uncoated portion, and having ease of application.

The bonding agent (S1) may be contained in an amount of 75 to 95% by weight based on the total weight of the bonding composition (S). At this time, if the content of the bonding agent (S1) is too low as less than 75% by weight, the viscosity becomes high and the coating may be difficult and the adhesiveness may be deteriorated. That is, the bonding agent S1 dissolves the plastic S2 and is applied to the pipes 10 and 20 to dissolve the surfaces 10a and 20a. When the content of the bonding agent S1 is low, 20 may be deteriorated in surface solubility and the adhesion may be deteriorated. If the content of the bonding agent (S1) is more than 95% by weight, the viscosity becomes too low and the content of the plastic (S2) becomes relatively low, so that the adhesiveness and the waterproofing property may be deteriorated. Considering this point, the bonding agent (S1) is preferably contained in an amount of 80 to 92% by weight, more preferably 82 to 90% by weight, 82 to 88.57% by weight based on the total weight of the bonding composition (S) 85 to 88% by weight. According to a preferred embodiment of the present invention, the bonding agent S1 is contained in the range of 80 to 92% by weight (more preferably 82 to 90% by weight, 82 to 88.57% by weight, or 85 to 88% by weight) , It has an excellent adhesive property and a water-repellent property, and has an appropriate viscosity favorable for application.

The adhesive composition (S) according to the present invention may further include at least one selected from polyvinyl acetate (PVA), a thickener, a dye and the like in addition to the plastic (S2) and the bonding agent (S1).

The polyvinyl acetate (PVA) can improve the adhesion. Polyvinyl acetate (PVA) has adhesiveness as its own, and also shares a vinyl group with, for example, plastic (S2) such as CPVC or PVC and piping 10 (20) such as CPVC pipe or PVC pipe, And has a high miscibility with these. Accordingly, the adhesion can be improved. Additionally, polyvinyl acetate (PVA) can increase the viscosity.

The polyvinyl acetate (PVA) may be included in an amount of 0.1 to 5% by weight based on the total weight of the adhesive composition (S). At this time, when the content of polyvinyl acetate (PVA) is too low as less than 0.1% by weight, the degree of improvement in adhesion due to its use may be insignificant. If the content of polyvinyl acetate (PVA) is more than 5% by weight, the viscosity may become too high. Taking this into consideration, it is preferable that polyvinyl acetate (PVA) is contained in an amount of 0.2 to 3% by weight based on the total weight of the adhesive composition (S). In addition, polyvinyl acetate (PVA) can be added to the ketone solvent after being mixed. Specifically, a solution prepared by dissolving the plastic (S2) and the bonding agent (S1) is first obtained, and then polyvinyl acetate (PVA) and a ketone solvent (acetone, MEK, MIBK, etc.) can be added and mixed.

The thickener is for increasing viscosity, which is selected from alcohols and water and the like. The alcohols may be selected from, for example, methanol, ethanol and isopropyl alcohol. At this time, it is preferable to use alcohols when the main agent of the bonding agent (S1) is a furan system (THF or the like) and use water when the main agent of the bonding agent (S1) is a ketone system (MEK or the like). Furans (THF, etc.) are well soluble in alcohols and ketones (MEK etc) are soluble in water. For example, when the plastic (S2) is CPVC and the bonding solvent (S1) is THF, when the alcohol is added thereto, THF dissolved in the alcohol may be dissolved in the alcohol and the viscosity may be increased by eluting the CPVC. That is, the viscosity is increased by the difference in solubility. The same applies to ketone (MEK) and water.

The thickening agent may be contained in an amount of 0.1 to 8% by weight based on the total weight of the adhesive composition (S). At this time, when the content of the thickener is too low as less than 0.1% by weight, the degree of improvement in viscosity due to use thereof may be insignificant. If the content of the thickener is more than 8% by weight, the viscosity becomes too high and coating failure may occur. In view of this point, it is preferable that the thickening agent is contained in an amount of 0.2 to 5% by weight based on the total weight of the bonding composition (S).

Further, the dye may be added as needed, and liquid or fine particles may be used. Such a dye may be contained, for example, in an amount of 0.01 to 2% by weight based on the total weight of the bonding composition (S).

On the other hand, as described above, the plastic (S2) can be separated from the waste piping in consideration of economical efficiency and environmental friendliness. The production method of the present invention will be described as follows.

The method for producing an adhesive composition (S) according to the present invention comprises a first step of obtaining a plastic (S2) powder obtained by pulverizing a waste piping, a second step of obtaining a bonding agent (S1) ) Powder to dissolve the plastic (S2) powder in the bonding solvent (S1); and a second step of filtering the dissolved solution obtained in the second step to remove the solid matter contained in the dissolution solution It includes three steps.

First, in the first step, the waste pipe is collected and cut to a predetermined particle size and crushed. At this time, the waste piping is a plastic waste pipe as described above, which can be selected from, for example, a waste CPVC pipe or a waste PVC pipe after being used as a digestion pipe. The waste piping is cut to an appropriate size, and then pulverized to have a predetermined particle size through a pulverizer to obtain a waste plastic powder.

The waste plastic powder may have an average particle size of, for example, 20 to 500 mesh, and may be 100 to 300 mesh or 150 to 200 mesh, for example, Of the average particle size. In this case, the smaller the particle size in terms of dissolving power, the more advantageous the waste plastic powder may be, but if it is too small, it may not be preferable to remove the solid matter in the filtering process (the third step).

In the second step, the binder resin (S1) and the waste plastic powder obtained in the first step are mixed to dissolve the waste plastic powder in the binder resin (S1). At this time, heat can be applied at the time of dissolution. Specifically, the bonding agent (S1) and the waste plastic powder may be mixed and dissolved while being heated. The waste plastic powder is, for example, from 5 to 25% by weight, from 8 to 25% by weight, or from 8 to 25% by weight, based on the combined weight of the waste plastic powder and the bonding agent (S1) (waste plastic powder + 22% by weight.

When the heat is applied as described above, the dissolving power of the waste plastic powder is increased and the separation efficiency can be increased. Specifically, waste plastics powder contains solids such as dyes in addition to plastics. When heat is applied, the solubility of plastics increases, and plastics and solids (dyes, etc.) can be easily separated. For example, heat can be dissolved while boiling occurs at a temperature of 70 ° C to 130 ° C. This second step (warm-melt) may be carried out for, for example, 20 minutes to 2 hours, or 30 minutes to 1 hour. At this time, depending on the content of the plastic (S2) powder, if the applied heat is too low as less than 70 deg. C, the degree of improvement of the dissolving power may be insignificant, and agglomerates of plastics and solids (such as dyes) may occur. If the temperature is higher than 130 占 폚, the volatilization amount (loss amount) of the bonding solvent S1 may become large.

According to one embodiment, when the content of the waste plastic powder is about 5 to 7% by weight, it is 70 to 90 ° C. When the content of the waste plastic powder is about 8 to 12% by weight, 90 to 100 ° C and about 12 to 18% 100 to 110 ° C in the case of about 18 to 25% by weight, and 110 to 130 ° C in the case of about 18 to 25% by weight. When heat is applied in the above range according to the respective contents of the waste plastic powder, the volatilization amount (loss amount) of the bonding solvent S1 is minimized without causing an agglomeration mass of plastics and solids (such as dyes) .

In the third step, the dissolving solution obtained through the second step, that is, the mixed solution of the bonding solvent S1 and the plastic S2 is filtered. Generally, the pipes 10 and 20 are made by using plastic as a main material and further adding additives such as a dye, a heat stabilizer and / or a releasing agent thereto. Accordingly, the plastic (S2) powder obtained by pulverizing the waste piping contains impurities such as dyes and additives, and such impurities can be present as solids in the solution. These solid components are preferably removed because they may adversely affect adhesion and waterproofing properties. Thus, the solid matter contained in the dissolution liquid is removed through filtering. Such solids can be removed by sieving through a filter having, for example, 200 to 500 mesh, or 250 to 350 mesh.

Further, after proceeding to the third step as described above, the bonding solvent (S1) may be further added so as to have an appropriate viscosity to further lower the viscosity or, in some cases, to add the thickening agent. The method for producing the adhesive composition (S) according to the present invention may further comprise the step of further adding an additional component. Such an additional component may be at least one selected from the group consisting of polyvinyl acetate (PVA) as an adhesion improving agent as described above, alcohols and / or water as a thickener, and a dye. In addition, the additional component may be added after the first step (pulverization), preferably after the second step (dissolution) or the third step (filtering).

The bonding composition S described above is applied to the surfaces 10a and 20a of the pipes 10 and 20 and is usefully used as an adhesive for connection between the pipes 10 and 20. According to another embodiment, the adhesive composition S constitutes the water leakage preventing layer 30 formed on the connecting portion A of the pipes 10 and 20 as described above.

According to a preferred embodiment, the water leakage preventing layer 30 is formed by applying the above-mentioned bonding composition S, wherein 82 to 88.57% by weight of a bonding agent; 10 to 14% by weight of plastic; (A) on the outer surface of the connecting portion (A) of the piping (10) (20), and 0.2 to 3 wt% of polyvinyl acetate (PVA) It is preferable to apply it by plural times. When the leakage preventing layer 30 is formed by using the adhesive composition S having such a composition as described above, it is possible to achieve excellent leakage preventing ability and to effectively prevent the binding force between the pipes 10 and 20 on the outer surface of the connecting portion A effectively Can be improved.

Hereinafter, embodiments of the present invention will be exemplified. The following examples are provided to illustrate the present invention in order to facilitate understanding of the present invention, and thus the technical scope of the present invention is not limited thereto.

[Examples 1 to 5]

CPVC, which is widely used as a raw material for fire extinguishing piping, was purchased and mixed and dissolved in a solvent to prepare a bonding composition. THF was used as the solvent. At this time, the content of CPVC was increased according to each example as shown in Table 1 below. In the following [Table 1], the content of each component is based on the whole adhesive composition (percentage, weight%).

[Examples 6 to 12]

The adhesive composition was prepared in the same manner as in Example 1 except that a mixture of THF (main solvent) and MEK (co-solvent) was used as a solvent. In addition, PVA was added as an adhesion improver, or a thickener was further added according to each example. At this time, first, a solution obtained by dissolving CPVC in a solvent (THF) was obtained, and MEK, PVA and a thickener were added thereto and mixed according to each example. In the case of PVA, it was added after dissolving in MEK, and an aqueous 80 wt% isopropyl alcohol solution was used as the thickening agent. The specific composition (component and content) according to each example is as shown in Table 1 below.

<Viscosity Measurement>

For the adhesive composition according to each of the examples, the viscosity at 25 캜 was measured using a Brookfield Dial viscometer (spindle No. 5, 50 rpm). The results are shown in Table 1 below.

&Lt; Evaluation of Workability (Coatability) >

The adhesive composition according to each of the examples was applied to the surface of the CPVC tube by brushing. The applicability was evaluated based on the following criteria, and the results are shown in Table 1 below.

* Poor: When the viscosity is too low to cause a drop, or when the viscosity is too high, it is difficult to apply a brush

* Normal: When the viscosity is low, a slight drop in the surface of the CPVC tube occurs, or because the viscosity is high and the application of the brush is difficult.

* Good: No pouring down, easy brushing and good spreadability

&Lt; Evaluation of compressive strength &

A CPVC pipe and a fitting (joint pipe) for a fire extinguishing pipe were prepared, and a bonding composition according to each of the embodiments was applied to one outer surface of the CPVC pipe, and then the fitting was interposed (bonded). Then, the compression strength (kgf) of each of the connecting specimens according to each example was evaluated by applying a load until the CPVC tube was broken or broken by using a universal testing machine. The results are shown in Table 1 below. At this time, the adhesive compositions of Examples 1, 5, and 12 did not evaluate (poor) the applicability.

                 &Lt; Composition and evaluation results of physical properties of the adhesive composition >
Remarks Composition of adhesive composition (unit: wt%)
Results of physical property evaluation CPVC THF MEK PVA Thickener Viscosity
(cP) Application property Compressive strength
(kg _f) Example 1
1.43 98.57 - - - 5.8 Bad - Example 2
4.29 95.71 - - - 32.6 usually 267.064 Example 3
7.14 92.86 - - - 53.3 usually 351.414 Example 4
11.43 88.57 - - - 544.1 Good 1073.761 Example 5
14.29 85.71 - - - 1216.1 Bad - Example 6
11.19 86.71 2.10 - - 660.8 Good 1049.761 Example 7
11.03 85.52 3.45 - - 785.4 Good 1035.025 Example 8
10.65 82.68 4.85 1.82 - 987.2 Good 1064.974 Example 9
10.32 80.00 6.26 3.42 - 1081.4 usually 1180.357 Example 10
11.19 86.65 - 0.60 1.56 962.8 Good 1217.644 Example 11
11.43 73.62 12.81 - 2.14 1067.1 usually 846.117 Example 12
10.32 80.00 - - 9.68 1325.3 Bad -
1) CPVC: Chlorinated Polyvinyl Chloride
2) THF: Tetrahydrofuran
3) MEK: methyl ethyl ketone
4) PVA: Polyvinyle acetate
5) Thickener: 80 wt% isopropyl alcohol
6) Viscosity (cP): 25 占 폚, Brockield dial viscometer (spindle No. 5, 50 rpm)

As shown in Table 1, when Examples 1 to 5 were compared with each other, it was found that viscosity increased with increasing CPVC content. In this case, when the content of CPVC was too low or high, it was found that the viscosity was too low or high and it was difficult to apply (poor). As in Example 4, the CPVC content was about 11% by weight or more and the viscosity was 500 cP or more And good compressibility (adhesive force) of 1,000 kgf or more.

In Examples 6 to 11, when MEK was further added as the solvent, the viscosity increased as the MEK content increased, but the compressive strength (adhesive force) decreased as the THF content decreased. In particular, as in Example 11, it was found that when the content of THF was too low, the compressive strength (adhesive force) decreased. As in Examples 8 to 10, it was found that the PVA increased the compressive strength (improved adhesion). However, when the content of PVA was too high, it was found that the viscosity increased.

In Examples 10 to 12, it was found that when alcohol (isopropyl alcohol) was added, viscosity was increased. This is because CPVC is highly soluble in THF, but has little solubility in alcohol (isopropyl alcohol), suggesting that dissolved CPVC is eluted again.

[Examples 13 to 17]

First, a pulmonary CPVC tube, which was used as a fire piping as a waste piping, was prepared, finely cut, and then pulverized using a pulverizer. Later, the pulverized CPVC powder with an average particle size of about 180 mesh was obtained. Next, the pulverized CPVC powder and the solvent THF were placed in a heating vessel and dissolved while being heated. At this time, the content of the pulverized CPVC powder was varied according to each example, and boiling was confirmed through visual observation, and the temperature at the time when boiling occurred was measured. The results are shown in Table 2 below. In the following [Table 2], the content of the pulverized CPVC powder is based on the mixing of the pulverized CPVC powder and THF as a whole (percentage, weight%).

After dissolving the dissolving solution while heating as above, the solution was filtered through a 300 mesh sieve to remove solid impurities such as dyes, and then left to stand at room temperature. Next, an appropriate amount of isopropyl alcohol as a thickening agent was added to the thus-obtained solution, and finally a bonded composition having a viscosity of about 900 to 950 cP (measured at about 25 캜) was obtained by recycling the pulmonary CPVC tube.

                <Evaluation results of boiling point by content of waste PVC> Remarks Content of lung CPVC Boiling point (b.p) Viscosity
(@ 25 ℃) Example 13
2 wt% 72 ℃ 902.7 Example 14
5 wt% 82 ° C 904.1 Example 15
10 wt% 95 ℃ 937.4 Example 16
15 wt% 106 ° C 931.4 Example 17
20 wt% 116 ° C 947.7

As shown in Table 2, the boiling point was found to vary depending on the content of the pulverized CPVC powder. That is, as the content of pulverized CPVC powder increased, the boiling point increased. When the CPVC tube is recycled, the boiling point according to the content of the pulverized CPVC powder is taken into consideration and the volatilization of the solvent (THF) is minimized by dissolving at a suitable temperature (optimal temperature) And the solubility can be increased at the same time.

The adhesive composition (content of CPVC pulp of 15% by weight) according to Example 16 was subjected to tensile strength, pressure resistance test and breakdown test after the pressure resistance test as described below, and the results are shown in Table 3 below. The tensile strength, the internal pressure test and the fracture test after the internal pressure test were carried out for the adhesive composition according to Example 10 showing the best results among Examples 1 to 12, and the results are shown in Table 3 ].

&Lt; Evaluation of tensile strength &

A CPVC pipe and a fitting (joint pipe) for a fire extinguishing pipe were prepared, and an adhesive composition was applied to the outer surface of one side of the CPVC pipe, and then the fitting was interposed (bonded). Then, the tensile strength (kgf) was evaluated by using a universal testing machine to stretch the CPVC tube or fitting until it broke or disappeared.

&Lt; Pressure test >

In the same manner as above, a CPVC tube and a fitting (joint tube) for a digestion pipe were first prepared, and an adhesive composition was applied to the outer surface of one side of the CPVC tube, and then the fitting was interposed (bonded). Then, water was injected and maintained at a pressure of 60 kgf (about 6.0 MPa) for 2 minutes to evaluate whether water leaks or deformation occurred.

<Fracture test after pressure test>

For the specimens subjected to the pressure test as described above, the pressure at which the fracture occurred was continuously evaluated by continuously increasing the hydraulic pressure until the CPVC tube was broken.

                       &Lt; Property evaluation result > Remarks The tensile strength
(kgf) Proof test Destructive test
(kgf) Example 10 1422.198 No leakage
No deformation 104.54 Example 16 1356.427 No leakage
No deformation 105.13

Fig. 4 is a photograph of a tensile strength test, and Fig. 5 is a photograph of a connecting specimen after the tensile strength test according to Example 16. Fig. 6 is a photograph after the fracture test, the left side is the connection specimen according to Example 10, and the right side is the photograph according to Example 16. Fig.

As shown in Table 3 and FIGS. 5 to 6, the adhesive compositions according to the respective Examples had excellent results in tensile strength, pressure resistance test and fracture test, and in particular, Tube was also recycled, the tensile strength of the Example 16 was found to be 1,300 kgf or more.

10: first piping 20: second piping
10a, 20a: surface 30: leak-proof layer
A: connecting site S: adhesive composition

Claims (10)

delete delete An adhesive composition for connection to a fire extinguishing piping for connection of a plastic re-fire pipe used in a fire extinguishing facility,
82 to 88.57% by weight of a bonding agent for dissolving the surface of the plastic re-digesting pipe;
10 to 14% by weight of plastic dissolved in the bonding agent; And
0.2 to 5% by weight of a thickener for increasing the viscosity,
A viscosity of 500 to 1,200 cP,
The bonding agent is furan-based,
Wherein the thickening agent is an alcohol.
The method of claim 3,
The bonding agent is at least one selected from tetrahydrofuran (THF) and dihydrofuran (DHF)
The plastic is at least one selected from chlorinated polyvinyl chloride (CPVC) and polyvinyl chloride (PVC)
Wherein the thickening agent is one or more alcohols selected from methanol, ethanol and isopropyl alcohol.
The method of claim 3,
Wherein the adhesive composition for connection to the digestive pipe further comprises 0.2 to 3% by weight of polyvinyl acetate (PVA).
delete A method for manufacturing an adhesive composition for connection to a fire extinguishing pipe according to any one of claims 3 to 5,
A first step of obtaining a waste plastic powder obtained by pulverizing a plastic waste pipe used in a digestion facility;
A second step of dissolving the waste plastic powder in the bonding solvent by mixing a bonding agent for dissolving the surface of the plastic re-digesting pipe and the waste plastic powder obtained in the first step, and then applying heat thereto; And
And a third step of filtering the solution obtained in the second step to remove the solids contained in the solution,
In the second step,
The waste plastic powder is mixed in an amount of 8 to 25% by weight based on the total weight of the waste plastic powder and the bonding agent,
Heat of 90 ° C to 100 ° C is applied when the content of the waste plastic powder is 8 to 12% by weight, heat of 100 ° C to 110 ° C is applied when the content of the waste plastic powder is 12 to 18% Wherein when the content of the waste plastic powder is 18 to 25 wt%, heat is applied at a temperature of 110 ° C to 130 ° C to dissolve the adhesive composition.
A method for connecting a fire extinguishing piping, comprising applying a bonding composition for connecting a fire extinguishing pipe according to any one of claims 3 to 5 to a surface of a plastic re-firepipe.
A first step of coating and bonding the adhesive composition for digestive pipe connection according to any one of claims 3 to 5 on the surface of a plastic re-digest pipe,
And a second step of forming a water leakage preventing layer on an outer surface of a pipe connection part connected through the first step.
delete

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