KR102627003B1 - Plasma-treated polyethylene coated stainless steel pipe using resin coating layer and adhesive layer coating composition, and its manufacturing method - Google Patents

Abstract

The present invention relates to the outer surface of a stainless steel pipe supplied with water supply being treated with a plasma flame,
It relates to a 'plasma pre-treated polyethylene coated stainless steel pipe using a resin coating layer and adhesive layer coating composition and a method of manufacturing the same', which is provided with a resin coating layer and an adhesive layer by applying or coating a resin coating layer and an adhesive layer coating composition of the present invention,
In particular, by the resin coating layer and the adhesive layer composed of the adhesive layer coating composition and the resin coating layer coating composition of the present invention,
The durability and corrosion resistance properties, including the tensile strength, penetration resistance, and elongation at break, of the stainless steel pipe are strengthened, and the adhesion of the resin coating layer composed of a composite polyethylene resin mixture is improved when coating the outer surface (outside) of the stainless steel pipe. Its plating power is strengthened and it is environmentally friendly at the same time.
It is hygienic due to the resin coating layer, and the coating operation of the resin coating layer is easy, which improves workability, reduces manufacturing costs, and is easy to use; It relates to 'plasma pretreated polyethylene coated stainless steel pipe using a resin coating layer and an adhesive layer coating composition and its manufacturing method.'

Description

Plasma-treated polyethylene coated stainless steel pipe using resin coating layer and adhesive layer coating composition, and its manufacturing method}

The present invention relates to 'plasma pre-treated polyethylene coated stainless steel pipe using a resin coating layer and an adhesive layer coating composition and a method of manufacturing the same';

More specifically, the resin coating layer coating composition and the adhesive layer coating composition of the composition of the present invention are applied or coated on the outer surface (outside) of the stainless steel pipe to which water supply is supplied, the surface of which has been plasma flame pretreated, to form a resin coating layer and a adhesive layer coating composition. It relates to 'plasma pre-treated polyethylene coated stainless steel pipe using a resin coating layer and an adhesive layer coating composition and a method of manufacturing the same', which is provided with an adhesive layer.

In particular, the durability and corrosion resistance properties, including the tensile strength, penetration resistance, and elongation at break, of the stainless steel pipe are strengthened by the adhesive layer and the resin coating layer composed of the adhesive layer coating composition and the resin coating layer coating composition of the present invention, and the composite polyethylene resin mixture When the resin coating layer composed of is coated on the outer surface (outside) of the stainless steel pipe, the adhesion is improved, the plating power of the resin coating layer is strengthened, and it is environmentally friendly at the same time.

It is hygienic due to the resin coating layer, and the coating operation of the resin coating layer is easy, which improves workability, reduces manufacturing costs, and is easy to use; It relates to 'plasma pretreated polyethylene coated stainless steel pipe using a resin coating layer and an adhesive layer coating composition and its manufacturing method.'

Hereinafter, the technology underlying the present invention will be described;

The technology behind the present invention is registered as Republic of Korea Patent No. 10-0649772 (registration date: November 17, 2006), 'Plasma device for surface treatment of cylindrical materials and method of manufacturing coated steel pipe through plasma processing. ' second, copy Additional problems of the technology and prior art were described as the background technology of the invention.

In general, steel pipes used for water supply and sewage pipes are prone to corrosion on the surface of the pipe due to moisture contained in the ground or water flowing through the inside after being buried underground. Therefore, the lifespan of the pipe is shortened due to corrosion. In order to prevent contamination of water (tap water) by corrosive foreign substances, an anti-corrosion coating layer is usually coated on the inner and outer surfaces of the pipe. A steel pipe coated with a coating layer in this way is called a coated steel pipe.

Materials used in adhesive resin piping for coating steel pipes include cast iron pipes, steel pipes, copper pipes, synthetic resin pipes, stainless steel pipes, and many other types depending on the material.

In general, to prevent damage and corrosion of steel pipes, which are widely used for water and sewer pipes, polymer resin is coated on the inner surface or inner surface of the steel pipe.

However, polymer resin-coated pipes sometimes experience corrosion after a certain period of time as the coating peels off due to water pressure and impact. The biggest challenge is to fuse corrosion-resistant synthetic resin pipes with metal pipes with tensile strength and durability. Due to its nature, complete combination with metal materials is impossible, so related technology development is currently being actively conducted.

Korean Industrial Standard KS D3589 is an extruded polyethylene coated steel pipe. In the case of Korean Industrial Standard KS D3589, the surface of the steel pipe is pre-heated after pretreatment, adhesive is applied, and polyethylene is coated by extrusion. In the case of KS D3607, the powder fusion type is used. This is a method in which foreign substances attached to the steel pipe are mechanically or chemically removed through a pretreatment process, the steel pipe is heated to a certain temperature, and then the powdered polyethylene melts and adheres to the steel pipe.

In addition, stainless steel pipes have excellent corrosion resistance due to the passive coating treatment on the surface, but the protection of the passive coating decreases depending on the surrounding environment, causing various types of corrosion and significantly reducing the service life.

The corrosion type of stainless steel pipes is largely divided into dry type (7 to 9% corrosion occurrence), which mainly occurs in sulfurization, oxidation, and nitriding, and wet type (70 to 75% corrosion occurrence) in general environments, and mainly occurs in waterworks. Wet corrosion is divided into general corrosion and localized corrosion, and includes intergranular corrosion, pitting corrosion, and crevice corrosion.

Therefore, in order to prevent general or local corrosion, the surface is treated with a sacrificial anode or a corrosion inhibitor, but wet corrosion mainly occurs in stainless steel pipes for water and sewerage due to the poor installation environment.

In order to prevent this, a method is being used to prevent corrosion of stainless steel pipes and improve surface safety and lifespan by applying a polyethylene coating method to stainless steel pipes used for water and sewerage.

The pretreatment method for polyethylene coated stainless steel pipes is sandblasting or shot blasting. Due to their high hardness, the adhesion of the adhesive used for polyethylene coated coating is significantly reduced after pretreatment, causing problems with polyethylene coated coating.

The coating layer coated on the surface of such a coated stainless steel pipe, that is, the outer surface and the inner surface, is usually first coated with a coating layer made of epoxy resin, and then a coating layer made of polyethylene resin is coated on top of that.

For example, the outer surface of a stainless steel pipe is gradually covered with a coating layer made of epoxy resin, an adhesive layer, and a coating layer made of polyethylene resin.

At this time, a coating layer made of epoxy resin is first coated on the surface of the pipe in order to increase the adhesion of the coating layer made of polyethylene resin, which has excellent corrosion resistance and chemical resistance, to the pipe, and then a coating layer made of polyethylene resin is coated on top of it.

In addition, polyethylene resin is known to have excellent corrosion resistance and chemical resistance and is generally easy to handle, so it is mainly used for surface coating of pipes.

However, the biggest problem that arises during the use of such coated stainless steel pipes is the peeling phenomenon in which the coating layer, for example, a resin coating layer such as epoxy or PE resin, is separated from the surface of the pipe.

Therefore, if the coating layer is peeled off from the outer surface of the stainless steel pipe, the pipe may be easily damaged by external impact due to corrosion of the outer surface of the pipe.

Meanwhile, there are known technologies to prevent the peeling phenomenon where the coating layer of such a coated steel pipe falls off from the surface of the pipe, but most of them improve the properties of the coating layer itself, such as epoxy resin or polyethylene resin, to increase adhesion or increase adhesion. , the coating method was improved to increase the adhesion of the coating layer to the pipe surface, or a separate adhesive was used to prevent peeling of the coating layer from the pipe surface.

In such a conventional case, the manufacturing process of the coated stainless steel pipe is complicated or a separate adhesive is used, so the overall manufacturing cost of the coated stainless steel pipe increases, productivity decreases, and above all, its effectiveness also decreases. It was insignificant.

In order to improve the above problem, before coating the surface of the stainless steel pipe with the coating material, the surface of the pipe is treated with plasma to modify the surface of the pipe to prevent peeling of the resin coating layer containing epoxy resin or PE resin. ,Exterior plasma pre-processing and plasma pre-processing equipment are used.

However, when used for a long period of time, the adhesion of the resin coating layer decreases and the resin coating layer peels off. At the same time, the durability and corrosion resistance of the pipe decrease due to the peeling of the resin coating layer, and workability decreases.

Therefore, an adhesive was developed to increase the adhesion of the adhesive when coating polyethylene coating on a stainless steel pipe, and in order to activate the adhesive, a technology was developed to improve adhesion by removing and reforming organic substances on the surface of the stainless pipe through plasma surface treatment, and plasma pre-treatment was used. The durability and corrosion resistance properties, including the tensile strength, penetration resistance, and elongation at break, of pipes, including stainless steel pipes, are strengthened, and the adhesion of the resin coating layer is improved when coating the inner and outer surfaces (inside and outside) of the pipe. At the same time, the plating power of

It is hygienic due to the resin coating layer, the coating operation of the resin coating layer is easy, improves workability, and is easy to use; The development of ‘plasma pretreated coated stainless steel pipe’ is urgently needed.

The problem of the prior art is solved by the 'plasma pretreated polyethylene coated stainless steel pipe using the resin coating layer and adhesive layer coating composition and its manufacturing method' of the present invention, and compared to the plasma pretreated coated steel pipe of the prior art;

In particular, the durability properties and corrosion resistance properties, including the tensile strength, penetration resistance, and elongation at break, of stainless steel pipes are strengthened by the resin coating layer and adhesive layer composed of the resin coating layer coating composition and the adhesive layer coating composition of the present invention, and the composite polyethylene resin mixture When the resin coating layer composed of is coated on the outer surface (outside) of the stainless steel pipe, the adhesion is improved, the plating power of the resin coating layer is strengthened, and it is environmentally friendly at the same time.

It is hygienic due to the resin coating layer, and the coating operation of the resin coating layer is easy, which improves workability, reduces manufacturing costs, and is easy to use; The purpose of the present invention and the technical problem to be achieved by the present invention are to provide 'a plasma pretreated polyethylene coated stainless steel pipe using a resin coating layer and an adhesive layer coating composition and a method for manufacturing the same.'

Of the present invention,

『 A stainless steel pipe, the surface of which is provided with a plasma pretreatment layer in which the surface of the stainless steel pipe is plasma flame pretreated;

an adhesive layer composed of a thermoplastic polymer resin mixture coated or applied to the outer surface (outside) of the stainless steel pipe provided with the plasma pretreatment layer;

'An article composition of a polyethylene coated stainless steel pipe plasma pretreated using a resin coat layer and an adhesive layer coating composition', consisting of a resin coating layer composed of a composite polyethylene resin mixture coated or applied to the outer surface (outside) of the adhesive layer;

『 Based on 100% by weight of thermoplastic polymer resin mixture,

A thermoplastic polymer resin mixture comprising 45 to 82% by weight of linear low density polyethylene composed of a polymer of 1-butene and ethene, 15 to 37% by weight of ethene-maleic anhydride copolymer, and 3 to 18% by weight of ethylene-vinyl acetic acid copolymer. It is composed of;

With respect to 100 parts by weight of the thermoplastic polymer resin mixture,

0.1 to 7.5 parts by weight of one or more additives selected from lubricants, diluents, and pigments are uniformly dispersed and mixed, with an average density of 0.920 g/cm3 to 0.950 g/cm3, a softening point of 85 to 95°C, and an elongation of 300 to 390. %, an 'adhesive layer composition' composed of a composite adhesive resin, which is a mixture of thermoplastic polymer resins with a hardness ranging from 40 to 45;

It is composed of a composite polyethylene resin mixture, which is a polymer composed of 50 to 65% by weight of ethylene polymer, 20 to 35% by weight of ethene polymer, and 15 to 20% by weight of polyethene,

For 100 parts by weight of composite polyethylene resin mixture,

Titanium oxide as an antioxidant, bis 2,2,6,6-tetramethyl-4-piperidyl sebacate (for X-filling) as a sunscreen, carbon black as a pigment, lubricant, or diluent. A 'resin coating layer composition' composed of a composite polyethylene resin mixture with an average density in the range of 0.920 g/cm3 to 0.950 g/cm3 in which 0.1 to 10 parts by weight of additives mixed with more than one species are uniformly dispersed and mixed;

『 Step S1: A step in which the surface of the stainless steel pipe is plasma pretreated using flame plasma at a processing speed of 10 to 20 m/min,

Step S2: forming an adhesive layer coated with a thermoplastic polymer resin mixture at a coating thickness of 0.05 to 0.5 mm on the outer surface of the plasma pre-treated stainless steel pipe;

Step S3: It consists of forming a resin coating layer coated with a composite polyethylene resin mixture at a coating thickness of 1.0 to 5.0 mm on the outer surface of the adhesive layer;

Or, step S1: a step of plasma pre-treating the surface of the stainless steel pipe using flame plasma at a processing speed of 10 to 20 m/min,

Step S21: forming an undercoating layer coated with a powder epoxy resin coating material at a coating thickness of 50 to 500 ㎛ on the outer surface of the plasma pre-treated stainless steel pipe,

Step S31: forming an adhesive layer coated with a thermoplastic polymer resin mixture at a coating thickness of 0.05 to 0.5 mm on the outer surface of the base coating layer,

Step S41: A step in which a resin coating layer coated with a composite polyethylene resin mixture at a coating thickness of 1.0 to 5.0 mm is formed on the outer surface of the adhesive layer. Manufacturing of a plasma pretreated polyethylene coated stainless steel pipe using a resin coating layer and an adhesive layer coating composition. by ‘method’; We strive to solve the above problems.

By the 'plasma pretreated polyethylene coated stainless steel pipe using a resin coating layer and adhesive layer coating composition and its manufacturing method' of the present invention, the problems of the prior art are solved, and compared to the plasma pretreated or non-plasma treated coated steel pipe of the prior art;

In particular, the resin coating layer and the adhesive layer composed of the resin coating layer and the adhesive layer coating composition of the present invention have the effect of strengthening the durability properties and corrosion resistance properties, including the tensile strength, penetration resistance, and elongation at break, of the stainless steel pipe;

When the resin coating layer composed of a composite polyethylene resin mixture is coated on the outer surface (outside) of the stainless steel pipe, the adhesion is improved, the plating power of the resin coating layer is strengthened, and the environmentally friendly effect is achieved;

Hygienic effect due to the resin coating layer;

It is easy to cover the resin coating layer, which improves workability, reduces manufacturing costs, and makes it easier to use; It is a very useful invention.

1 is a reference diagram of a plasma pretreated polyethylene-coated stainless steel pipe of the present invention;
Figure 2 is a pulling strength (adhesion) test report from KTR, a certified institution in an embodiment of the present invention,
Figures 3 and 4 are pull strength (adhesion) test reports from KTR, a certified organization, for comparative examples 1 and 2 of the prior art.

Hereinafter, the "plasma pre-treated polyethylene coated stainless steel pipe using a resin coating layer and an adhesive layer coating composition and its manufacturing method" of the present invention will be described in detail with reference to the attached drawings;

In addition, the 'coating composition of the resin coating layer and the adhesive layer of the plasma pre-treated polyethylene coated stainless steel pipe' constituting the present invention;

' Solving the problems of the prior art,

In particular, the durability and corrosion resistance properties, including tensile strength, penetration resistance, and elongation at break, of plasma pretreated stainless steel pipes are strengthened,

When the resin coating layer composed of a composite polyethylene resin mixture is coated on the outer surface (outside) of a stainless steel pipe equipped with plasma pretreatment and an adhesive layer, the adhesion is improved, the plating power of the resin coating layer is strengthened, and it is environmentally friendly at the same time.

It is hygienic due to the resin coating layer, the coating operation of the resin coating layer is easy, which improves workability, reduces manufacturing costs, and makes it clear that it is composed of a 'resin coating layer that is easy to use';

The embodiment mentioned below is a preferred embodiment, and the present invention is not limited to this embodiment, and it is clear that 'plasma pre-treated coated steel pipe' consisting of the same category of technical idea is included in this right.

As shown in Figures 1 to 4;

The outer surface (outside) of a stainless steel pipe supplied with water supply is plasma flame pretreated, and the coating composition of the present invention is coated to provide a resin coating layer and an adhesive layer. A polyethylene-coated stainless steel pipe (100) that has been plasma pretreated using a coating composition is;

1) a stainless steel pipe (10) provided with a plasma pretreatment layer (20) in which the surface of the stainless steel pipe is plasma flame pretreated;

2) The outer surface (outside) of the stainless steel pipe 10 provided with the plasma pretreatment layer 20, where the resin coating layer 40 is easily bonded to the outside of the stainless steel pipe 10 provided with the plasma pretreatment layer 20. an adhesive layer (30) composed of a thermoplastic polymer resin mixture coated or applied thereto;

3) The durability, corrosion resistance, and plating power of the stainless steel pipe (10) equipped with the plasma pretreatment layer (20) are enhanced and environmentally friendly.

It consists of a resin coating layer (40) composed of a composite polyethylene resin mixture coated or applied to the outer surface (outside) of the adhesive layer (30).

The stainless steel pipe 10 is;

A plasma pretreatment layer in which the surface of the stainless steel pipe 10 is pretreated at a processing speed of 10 to 20 m/min using a conventional flame plasma device that generates flame plasma.

With a stainless steel pipe (10) equipped with (20),

The surface of the stainless steel pipe (10) is plasma pretreated using flame plasma to remove contaminants remaining on the surface of the stainless steel pipe (20) and increase the surface energy of the stainless steel pipe (10). A stainless steel pipe equipped with a plasma pretreatment layer (20) in which the adhesion of the coating layer (40) is primarily improved.

It consists of (10).

The adhesive layer 30 is;

Based on 100% by weight of thermoplastic polymer resin mixture,

45 to 82% by weight of linear low density polyethylene (LLDPE) consisting of a polymer of 1-butene and ethene (1-BUTENE, POLYMER WITH ETHENE), and ethene-maleic anhydride copolymer (ETHENE)

-MALEIC ANHYDRIDE COPOLYMER) 15 to 37% by weight, and ethylene-vinyl acetic acid copolymer

(ETHYLENE-VINYL ACETATE COPOLYMER) It is composed of 3 to 18% by weight of a thermoplastic polymer resin mixture.

In addition, with respect to 100 parts by weight of the thermoplastic polymer resin mixture,

0.1 to 7.5 parts by weight of one or more selected from the group consisting of lubricants, diluents, and pigments that do not adversely affect the physical properties of the thermoplastic polymer resin mixture are uniformly dispersed and mixed.

A gel-like adhesive layer (30) composed of a composite adhesive resin, which is a mixture of thermoplastic polymer resins with an average density of 0.920 g/cm3 to 0.950 g/cm3, a softening point of 85 to 95°C, an elongation of 300 to 390%, and a hardness of 40 to 45. It consists of

Additionally, the coating thickness is preferably extruded or molded in an extruder or molding machine. It consists of an adhesive layer 30 of 0.05 to 0.5 mm.

Therefore, by the adhesive layer 30 composed of a composite adhesive resin, which is a thermoplastic polymer resin mixture,

When the resin coating layer 40 composed of a composite polyethylene resin mixture is coated on the outer surface (outside) of the stainless steel pipe 10 equipped with the plasma flame pretreatment and adhesive layer 30, the adhesion is further improved secondarily, and the resin coating layer 40 ), while the plating power of

The resin coating layer 40 is easy to cover, improves workability, and is composed of an adhesive layer 30 that is a thermoplastic polymer resin mixture made of a composite adhesive resin, making it more convenient to use.

The resin coating layer 40 is;

CH2 50 to 65% by weight of ethylene polymer (Ethylene Polymer) and C2H4 20 to 35% by weight of Ethene Polymer and C3H6 It is composed of a composite polyethylene resin mixture, which is a polymer composed of 15 to 20% by weight of polyethene.
More preferably, 50 to 65% by weight of Ethylene Polymer of CH2 structure with a density of 0.94 to 0.97g/cm3, and 20 to 35% by weight of Ethene Polymer of C2H4 structure with density of 0.91 to 0.94g/cm3. % and 15 to 20% by weight of polyethene of a C3H6 structure with a density of 0.93 to 0.95 g/cm3.

In addition, with respect to 100 parts by weight of the composite polyethylene resin mixture,

As an additive, one selected from the group consisting of titanium oxide as an antioxidant, bis 2,2,6,6-tetramethyl-4-piperidyl sebacate (for X-filling) as a sunscreen, carbon black as a pigment, lubricant, and diluent. A gel-like resin coating layer (40) composed of a composite polyethylene resin mixture with an average density in the range of 0.920 g/cm3 to 0.950 g/cm3, in which 0.1 to 10 parts by weight of a species or a mixture of one or more types of additives is uniformly dispersed and mixed. It consists of

In addition, it preferably consists of a resin coating layer 40 with a coating thickness of 1.0 to 5.0 mm that is extruded or molded using an extruder or molding machine.

Therefore, the surface of the stainless steel pipe 10 is subjected to plasma flame pretreatment and the resin coating layer 40 made of a composite polyethylene resin mixture of the composition of the present invention coated on the outer surface (outside) of the adhesive layer 30,

The durability and corrosion resistance properties, including the tensile strength, penetration resistance, and elongation at break, of the stainless steel pipe (10) are strengthened, and the resin coating layer (40) composed of a composite polyethylene resin mixture is applied to the outer surface (outside) of the stainless steel pipe (10). When coating, adhesion is improved and the plating power of the resin coating layer 40 is strengthened, and at the same time, it is environmentally friendly.

It is composed of a resin coating layer 40 composed of a composite polyethylene resin mixture, which is hygienic, easy to cover with the resin coating layer 40, improves workability, and is easy to use.

Therefore, the ‘polyethylene coated stainless steel pipe (100) plasma pretreated using a resin coating layer and an adhesive layer coating composition’ of the present invention is;

By plasma treating the surface of the stainless steel pipe (10) using flame plasma, contaminants remaining on the surface of the stainless steel pipe are removed, and the surface energy of the stainless steel pipe (10) is increased, so that the adhesion of the resin coating layer (40) of the composition of the present invention is 1. Technical composition of the improved plasma flame pretreated stainless steel pipe (10);

When the adhesive layer 30 and the resin coating layer 40 of the present invention are coated on the outer surface (outside) of the stainless steel pipe 10 subjected to plasma flame pretreatment, the adhesion is further improved secondarily, and the adhesion of the adhesive layer 30 is strengthened, At the same time, the plating power of the resin coating layer 40 is strengthened,

The technical composition of the adhesive layer 30, which is a thermoplastic polymer resin mixture composed of a composite adhesive resin, has a structure that improves workability and is more convenient to use because the resin coating layer 40 is easy to cover;

Durability and corrosion resistance properties, including tensile strength, penetration resistance, and elongation at break, of the stainless steel pipe (10) are strengthened,

The plating power of the resin coating layer 40 is strengthened, and at the same time, it is environmentally friendly due to the composite polyethylene resin mixture.

It is hygienic thanks to the resin coating layer 40, and the resin coating layer 40 is composed of a single structure, making coating work easy, providing excellent workability, reducing manufacturing costs, and making it a composite polyethylene resin mixture that is easy to use. It consists of a 'polyethylene coated stainless steel pipe (100)' that has been plasma pretreated using a resin coating layer and an adhesive layer coating composition, with a technical structure consisting of a resin coating layer (40).

Additionally, as needed;

1) a stainless steel pipe (10) provided with a plasma pretreatment layer (20) in which the surface of the stainless steel pipe is plasma flame pretreated;

2) a base coating layer coated with a powder epoxy resin coating material on the outer surface of the plasma pretreated stainless steel pipe 10 with a coating thickness of 50 to 500 ㎛;

3) an adhesive layer 30 composed of a thermoplastic polymer resin mixture coated or applied to the outer surface of the base coating layer;

4) It is composed of a resin coating layer (40) composed of a composite polyethylene resin mixture coated or applied to the outer surface of the adhesive layer (30),

It may be composed of a ‘polyethylene coated stainless steel pipe 100 that has been plasma pretreated using a resin coating layer and an adhesive layer coating composition’ in which the adhesion of the resin coating layer is further strengthened by the base coating layer and the adhesive layer.

Therefore, the outer surface (outside) of the plasma pre-treated stainless steel pipe 10 is first coated with a powder epoxy resin coating layer of 50 to 500㎛, and the thermoplastic polymer resin mixture is applied to the outer surface (outside) of the undercoating layer at a thickness of 0.05 to 500㎛. It consists of an adhesive layer 30 secondaryly coated to a thickness of 0.5 mm, and a resin coating layer 40 coated with a composite polyethylene resin mixture to a thickness of 1.0 to 5.0 mm on the outer surface (outside) of the adhesive layer 30;

The adhesion of the resin coating layer is further strengthened by the base coating layer and adhesive layer coated 1st and 2nd time in a double layer structure. It consists of 'polyethylene coated stainless steel pipe (100) that has been plasma pretreated using a resin coating layer and an adhesive layer coating composition.'

Additionally, as needed;

The gel-like adhesive layer 30 is composed of a composite adhesive resin, which is a thermoplastic polymer resin mixture,

It is composed of an adhesive layer 30 on a sol (SOL), or is used in an extruder or molding machine. It may be composed of an adhesive layer 30 that is extruded, coated, or processed into an extruded or molded sheet;

The gel-like resin coating layer 40 composed of the composite polyethylene resin mixture,

It is composed of a resin coating layer 40 on a sol (SOL), or is used in an extruder or molding machine. It may be composed of a resin coating layer 40 that is extruded or processed into an extruded sheet or molded sheet;

delete

A general stainless steel pipe (10) without plasma flame pretreatment or a plasma pretreated polyethylene using a resin coating layer and adhesive layer coating composition provided with an adhesive layer (30) and a resin coating layer (40) on the outside or inside of a metal steel pipe, respectively. It may be composed of a coated stainless steel pipe (100);

Adhesive layer on the inner and outer surfaces (inside and outside) of the plasma flame pretreated stainless steel pipe (10)

It may be composed of a 'polyethylene-coated stainless steel pipe (100) plasma pretreated using a resin coating layer and an adhesive layer coating composition', each of which is provided with (30) and a resin coating layer (40).

In addition, the 'polyethylene coated stainless steel pipe (100) plasma pretreated using a resin coating layer and an adhesive layer coating composition' of the present invention;

Of course, it can be composed of stainless steel pipes through which water supply water or industrial water is supplied.

In addition, the 'method for manufacturing a plasma pretreated polyethylene coated stainless steel pipe (100) using a resin coating layer and an adhesive layer coating composition' of the present invention;

Step S1: A step in which the surface of the stainless steel pipe is plasma pretreated using flame plasma at a processing speed of 10 to 20 m/min and:

Step S2: Forming an adhesive layer coated with a thermoplastic polymer resin mixture at a coating thickness of 0.05 to 0.5 mm on the outer surface of the plasma pre-treated stainless steel pipe and:

Step S3: A resin coating layer coated with a composite polyethylene resin mixture at a coating thickness of 1.0 to 5.0 mm is formed on the outer surface of the adhesive layer, or is prepared;

Or, step S1: a step of plasma pre-treating the surface of the stainless steel pipe using flame plasma at a processing speed of 10 to 20 m/min and:

Step S21: forming a base coating layer coated with a powder epoxy coating to a coating thickness of 50 to 500 ㎛ on the outer surface of the plasma pre-treated stainless steel pipe and:

Step S31: forming an adhesive layer coated with a thermoplastic polymer resin mixture at a coating thickness of 0.05 to 0.5 mm on the outer surface of the base coating layer and:

Step S41: A resin coating layer is formed on the outer surface of the adhesive layer with a composite polyethylene resin mixture coated with a coating thickness of 1.0 to 5.0 mm.

Hereinafter, the 'plasma pretreated polyethylene coated stainless steel pipe (100) using the resin coating layer and adhesive layer coating composition and its manufacturing method' of the present invention will be described in more detail through examples.

(Example)

After creating a stainless steel pipe with a plasma pretreatment layer in which the surface of the stainless steel pipe is plasma flame pretreated at a processing speed of 15 m/min using a conventional flame plasma device that generates flame plasma,

Based on 100% by weight of thermoplastic polymer resin mixture,

100 parts by weight of a thermoplastic polymer resin mixture composed of 65% by weight of linear low density polyethylene composed of a polymer of 1-butene and ethene, 25% by weight of ethene-maleic anhydride copolymer, and 10% by weight of ethylene-vinyl acetic acid copolymer. ,

An adhesive layer composed of a composite adhesive resin with an average density of 0.93 g/cm3, a softening point of 87°C, an elongation of 320%, and a hardness of 42, dispersed and blended with 7.2 parts by weight of isopropyl alcohol as a diluent and 0.2 parts by weight of carbon black as a pigment, After coating the outer surface of the plasma flame pretreated stainless steel pipe with a thickness of 0.3 mm,

It is composed of 55% by weight of ethylene polymer with a density of 0.96g/cm3 of the CH2 structure, 30% by weight of ethene polymer with a density of 0.92g/cm3 of the C2H4 structure, and 15% by weight of polyethene with a density of 0.94g/cm3 of the C3H6 structure. For 100 parts by weight of composite polyethylene resin mixture,

3.5 parts by weight of titanium oxide as an antioxidant, 1.5 parts by weight of bis 2,2,6,6-tetramethyl-4-piperidyl sebacate (X- for landfill) as a sunscreen, and 7.5 parts by weight of isopropyl alcohol as a diluent. A resin coating layer composed of a composite polyethylene resin mixture with an average density of 0.93 g/cm3 dispersed and mixed with 0.3 parts by weight of carbon black as a pigment is applied to the outer surface of the adhesive layer coated on the outer surface of the plasma flame pretreated stainless steel pipe with a thickness of 3.5 mm. A plasma-pretreated polyethylene-coated stainless steel pipe that was coated and dried was manufactured.

(Comparative Example 1)

On the surface of stainless steel pipes distributed in Korea, an epoxy resin coating layer, an adhesive layer, and a polyethylene resin coating layer are coated with a coating thickness of 3.8 mm in the order of lamination, and the primary epoxy resin coating layer and the polyethylene resin secondary coating layer are applied in the first and second stages. Multiple coated stainless steel pipes were purchased.

(Comparative Example 2)

A stainless steel pipe coated with an EVA resin adhesive layer and a polyethylene resin coating layer was purchased, which was coated with a coating thickness of 3.8 mm in the order of lamination of the EVA resin adhesive layer and the polyethylene resin coating layer on the surface of a plasma flame pretreated stainless steel pipe distributed domestically.

Test method and comparative results

go. Pulling strength (adhesion)

Test method: KSD 3589: 2022 method of Examples and Comparative Examples 1 and 2 at 23 ± 2°C. The pulling strength (adhesion) was measured.

Measurement progress:

An example in which an adhesive layer composed of the composite adhesive resin of the present invention and a resin coating layer composed of a composite polyethylene resin mixture were provided on the outer surface of a stainless steel pipe subjected to plasma flame pretreatment is 95N/10mm, Comparative Example 1: 21N/10mm, Comparative Example 2: The pulling strength (adhesion) properties were strengthened by 2.5 to 4.5 times compared to 38N/10mm, and it was confirmed that it met and passed the corresponding standard of 35N/10mm or more. (Figures 2 to 4: Certified (Refer to the test report of the institution, KTR Korea Chemical Convergence Testing Laboratory)

In addition, Comparative Example 1 was 21N/10mm despite being composed of a resin coating layer in which an epoxy resin primary coating layer and a polyethylene resin secondary coating layer were coated in multiple layers through the first and second coatings, which is above the corresponding standard value of 35N/10mm. found to be unsatisfactory and disqualified;

Although Comparative Example 2 was composed of an EVA resin adhesive layer and a polyethylene resin coating layer, it was found that the pulling strength (adhesion) property was significantly lower at 38N/10mm compared to Example 95N/10mm (Figure 3, FIG. 4: Refer to the test report from KTR Korea Chemical Convergence Testing Laboratory, an accredited institution)

me. Intrusion resistance

Test method: KSD 3589: The penetration resistance of Examples and Comparative Examples 1 and 2 was measured using the Annex F method.

Measurement results:

In an example of the present invention, an adhesive layer composed of a composite adhesive resin and a resin coating layer composed of a composite polyethylene resin mixture are provided on the outer surface of a stainless steel pipe that has been plasma flame pretreated. 2) As 0.2mm at ℃,

Comparative Example 1: 0.6 mm at (23 ± 2) ℃, 0.8 mm at (60 ± 2) ℃, Comparative Example 2: 0.4 mm at (23 ± 2) ℃, 0.6 mm at (60 ± 2) ℃. The intrusion resistance properties were strengthened, and it was found to be excellent and meet the standards of 0.3 mm or less at (23 ± 2) ℃ and 0.5 mm or less at (60 ± 2) ℃.

In addition, although Comparative Example 1 was composed of a resin coating layer in which an epoxy resin primary coating layer and a polyethylene resin secondary coating layer were coated in multiple layers through the first and second coatings, the temperature was 0.6 mm at (23 ± 2) ℃ and (60 ± 2) ℃. It was found that it fell short of 0.8 mm and failed to meet the relevant standards of 0.3 mm at (23 ± 2) ℃ and 0.5 mm at (60 ± 2) ℃;

Comparative Example 2 In addition, despite being composed of an EVA resin adhesive layer and a polyethylene resin coating layer, the thickness was 0.4 mm at (23 ± 2) ℃ and 0.6 mm at (60 ± 2) ℃, which is 0.3 mm at (23 ± 2) ℃, which is the standard value. , it was found that it fell short of 0.5 mm or less at (60±2)℃ and failed.

la. Elongation at break

Test method: The elongation at break of Examples and Comparative Examples 1 and 2 was measured using the KSD 3589: 2022 method.

Measurement progress:

The example was 680%, and it was found that it met and passed the corresponding standard of 350% or more.

In addition, the comparative examples were Comparative Example 1: 430% and Comparative Example 2: 620%, which met the standard of 350% or more, but were found to be significantly lower than those of the Examples.

mind. Plating power, corrosion resistance, environmental friendliness, workability, manufacturing cost

Test method: The pulling strength (adhesion) properties and product composition of Examples and Comparative Examples 1 and 2 were compared.

Measurement progress:

In the examples, the pulling strength (adhesion) properties are suitable for the standard values, and the plating force and corrosion resistance are excellent due to the product composition of the adhesive layer and the resin coating layer coated on the outer surface of the stainless steel pipe pretreated with plasma flame,

It is environmentally friendly as it is composed of an adhesive layer made of composite polyethylene and a resin coating layer, and the resin coating layer is composed of a single structure, so it has excellent workability and has been found to reduce manufacturing costs;

In Comparative Example 1, the pulling strength (adhesion) property value fell below the standard value, so the adhesion decreased, and the corrosion resistance also decreased due to the decrease in adhesion;

Pollutants such as volatile organic compounds (VOC) are generated by the epoxy resin coating layer, and since it is composed of a resin coating layer with a primary and secondary plural structure of an epoxy resin coating layer and a polyethylene resin coating, workability is significantly reduced and the manufacturing cost is also increased. It has been proven.

In addition, the pulling strength (adhesion) property of Comparative Example 2 was improved by 1.8 times compared to Comparative Example 1, slightly exceeding the standard value, and the corrosion resistance was also slightly improved.

The intrusion resistance is 0.4 mm at (23±2)℃ and 0.6 mm at (60±2)℃, which falls below the corresponding standards of 0.3 mm at (23±2)℃ and 0.5 mm at (60±2)℃. and was rejected;

It was found that it was composed of an EVA resin adhesive layer and a polyethylene resin coating layer, which lowered workability and increased manufacturing costs.

Accordingly, as shown in the above comparative results, the embodiment in which an adhesive layer composed of the composite adhesive resin of the embodiment of the present invention and a resin coating layer composed of a composite polyethylene resin mixture are provided on the outer surface of a stainless steel pipe subjected to plasma flame pretreatment;

The durability and corrosion resistance properties, including tensile strength, penetration resistance, and elongation at break, of plasma pretreated stainless steel pipes are enhanced;

When coating the outside of a stainless steel pipe with a resin coating layer composed of a composite polyethylene resin mixture, the adhesion is improved, and the plating power of the resin coating layer is further strengthened.

It is environmentally friendly as it is composed of an adhesive layer and a resin coating layer made of composite polyethylene resin;

The resin coating layer is composed of a single structure, which has excellent workability, reduces manufacturing costs, and is easy to use; It was found to be composed of 'plasma pretreated polyethylene coated stainless steel pipe and manufacturing method using a resin coating layer and an adhesive layer coating composition.'

Above, the present invention has been described in detail through specific embodiments, but the present invention is not limited to the above embodiments, and various modifications can be made by those skilled in the art within the scope of the technical idea of the present invention.

100: Plasma pretreated polyethylene coated stainless steel pipe of the present invention (plasma pretreated polyethylene coated stainless steel pipe using a resin coating layer and adhesive layer coating composition)
10: stainless steel pipe
20: Plasma pretreatment layer
30: Adhesive layer
40: Resin coating layer

Claims (9)

'Plasma pre-treated polyethylene coated stainless steel pipe using a resin coating layer and adhesive layer coating composition (100)', in which the outer surface of the stainless steel pipe supplied with water supply is plasma flame pretreated and the outer surface of the stainless steel pipe is provided with a resin coating layer and an adhesive layer;

A stainless steel pipe (10) provided with a plasma pretreatment layer (20) in which the surface of the stainless steel pipe is pretreated with a plasma flame;
Based on 100% by weight of the thermoplastic polymer resin mixture coated or applied to the outer surface of the plasma pretreatment layer 20,
A thermoplastic polymer resin mixture comprising 45 to 82% by weight of linear low density polyethylene composed of a polymer of 1-butene and ethene, 15 to 37% by weight of ethene-maleic anhydride copolymer, and 3 to 18% by weight of ethylene-vinyl acetic acid copolymer. An adhesive layer 30 composed of;
CH2 coated or applied to the outer surface of the adhesive layer 30 50 to 65% by weight of ethylene polymer of the structure, and C2H4 20 to 35% by weight of an ethene polymer of the structure, and C3H6 A resin coating layer (40) composed of a composite polyethylene resin mixture, which is a polymer composed of 15 to 20% by weight of polyethene in the structure; A polyethylene-coated stainless steel pipe (100) subjected to plasma pretreatment using a resin coating layer and an adhesive layer coating composition, characterized in that it consists of: According to clause 1,
The adhesive layer 30;
With respect to 100 parts by weight of the thermoplastic polymer resin mixture,
0.1 to 7.5 parts by weight of one or more additives selected from lubricants, diluents, and pigments are uniformly dispersed and mixed, with an average density of 0.920 g/cm3 to 0.950 g/cm3, a softening point of 85 to 95°C, and an elongation of 300 to 390. %, a polyethylene coated stainless steel pipe that has been plasma pretreated using a resin coating layer and an adhesive layer coating composition, characterized in that it consists of a gel-like adhesive layer (30) composed of a composite adhesive resin, which is a mixture of thermoplastic polymer resins with a hardness in the range of 40 to 45. (100). According to clause 1,
The resin coating layer 40;
For 100 parts by weight of composite polyethylene resin mixture,
Titanium oxide as an antioxidant, bis 2,2,6,6-tetramethyl-4-piperidyl sebacate (for X-filling) as a sunscreen, carbon black as a pigment, lubricant, or diluent. It is composed of a gel-like resin coating layer (40) composed of a composite polyethylene resin mixture with an average density in the range of 0.920 g/cm3 to 0.950 g/cm3 in which 0.1 to 10 parts by weight of additives mixed with more than one species are uniformly dispersed and mixed. A polyethylene coated stainless steel pipe (100) characterized by plasma pretreatment using a resin coating layer and an adhesive layer coating composition. According to clause 1,
Plasma using a resin coating layer and an adhesive layer coating composition, characterized in that a base coating layer coated with a powder epoxy resin coating is provided on the outer surface of the stainless steel pipe 10 provided with the plasma flame pre-treatment layer 20. Pretreated polyethylene coated stainless steel pipe (100). delete delete According to claim 2 or 3,
The adhesive layer 30 or the resin coating layer 40;
SOL or extruded coating Or one type of adhesive layer selected from extruded sheet or molded sheet.
(30) Or a polyethylene coated stainless steel pipe (100) that has been plasma pretreated using a resin coating layer and an adhesive layer coating composition, characterized in that it consists of a resin coating layer (40). delete According to clause 1,
The stainless steel pipe (10);
Plasma pretreated polyethylene coating using a resin coating layer and an adhesive layer coating composition, characterized in that an adhesive layer (30) and a resin coating layer (40) are provided on the inside or outside of a stainless steel pipe or a metal steel pipe without plasma flame pretreatment, respectively. Stainless steel pipe (100).