KR101693555B1 - Method for producing pipe with wear resistance liner layer and pipe thereof - Google Patents

Abstract

The present invention relates to a method of manufacturing a pipe having a wear-resistant liner layer and a pipe thereof, and more particularly, to a method of manufacturing a pipe having a wear-resistant liner layer by using a mixed resin comprising a diluent for lowering viscosity in thermosetting resin streams and a controlled radical polymerization reaction agent for controlling a curing reaction Characterized in that the inner wall of the pipe is first coated and then a mixture containing an abrasion resistant agent and glass fiber is coated on the upper part of the pipe and then the mixture is temporarily cured at a temperature of 60 to 70 ° C. A method and a pipe thereof. The pipe according to the manufacturing method of the present invention has an effect that the liner layer is thick and the wear resistance is improved and the life of the pipe is prolonged.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pipe having a wear-resistant liner layer,

The present invention relates to a method of manufacturing a pipe having a wear resistant liner layer and a pipe therefor.

Conventional filament winding pipes are produced by adding amorphous particles such as silicon carbide, alumina or the like, which are generally known as abrasion-resistant fillers, to a resin such as unsaturated vinyl ester or an epoxy resin at about 30% (weight ratio) The mixed resin is applied to the mandrel of the filament winding machine by a suitable operation of 2 to 3 mm, and is flattened with a spatula, and is uniformly cured. And the outer reinforcing layer is formed by winding it with glass fiber and resin. The abrasion resistant pipe manufactured by the above method is inconvenient to change the position of the pipe by 120 degrees about once every six months since the surface of the certain portion of the wear resistant layer is worn intensively. There is a need to replace the entire pipe and there is an economic loss due to the reworking. Further, according to the prior art, only a thickness of 3 mm or less is applied. If it is more than 3 mm, it is difficult to mix sharp particles with a resin, so that it is difficult to apply thickly and also brittleness causes cracks. As a technique for solving such a problem, Korean Patent Registration No. 0541118 discloses a method of manufacturing a laminate comprising a Foof layer on which a polymer and a ceramic-based liner and a filament are wound, a Folp layer comprising a helical layer wound on a predetermined angle, And a boss joined to the bosses.

In addition, Korean Patent No. 0591732 discloses a method for automatically controlling the temperature and curing time required for cracking and peeling when a composite material is thermally cured, There is known a filament winding forming method which is free from cracks, has a sufficiently high tensile strength, and has an excellent insulation property.

However, these techniques are not only difficult to apply in the field because of low productivity, lack of elasticity, and fragile brittleness, and there are still problems such as high cost of molding equipment and materials. Therefore, there is an urgent need for a technique for manufacturing a wear-resistant pipe applicable in the field.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing an abrasion resistant pipe having a liner layer that minimizes abrasion of an inner wall of a pipe by a material to be transferred and a pipe therefor.

In order to achieve the above object, the present invention provides a method of manufacturing a pipe, comprising the steps of: (1) sanding an inside of a pipe and attaching a chop mat or a surface mat cut to a predetermined length;

(2) a first coating step of injecting a mixed resin having a low viscosity including a thermosetting resin, a diluent, and a controlled radical polymerization agent so as to impregnate the mat;

(3) applying a mixture containing the wear-resistant agent and the glass fiber on the surface coated with the low-viscosity mixed resin to perform secondary coating;

(4) after the step (3), curing by instant heating at a temperature of 60 to 70 캜; And

(5) Performing a flattening operation with a roller immediately after curing in the step (4), and a method of manufacturing a pipe having a wear resistant liner layer.

The present invention also provides a pipe having an abrasion-resistant liner layer produced according to the above-described manufacturing method.

The present invention relates to a method of manufacturing a pipe having a wear-resistant liner layer and a pipe thereof, and the pipe manufactured by the manufacturing method of the present invention has an effect that the wear-resistant liner layer is thick, durability is improved, and the life of the pipe is prolonged. Therefore, when the pipe of the present invention is used, the replacement time can be delayed, so that not only the economic burden can be reduced, but also the troubles due to the replacement can be solved.

1 is a schematic view showing a process of manufacturing a pipe having an abrasion-resistant liner layer of the present invention by an centrifugal method.
Figure 2 is a schematic diagram illustrating the inner coated surface flat work of a pipe having a wear resistant liner layer of the present invention.
3 is a view showing a flange included in the pipe connector of the present invention.

The present invention relates to a method of manufacturing a pipe having a wear-resistant liner layer and a pipe thereof, and more particularly, to a method of manufacturing a pipe having a wear- Attaching step;

(2) a first coating step of injecting a mixed resin having a low viscosity including a thermosetting resin, a diluent, and a controlled radical polymerization agent so as to impregnate the mat;

(3) applying a mixture containing the wear-resistant agent and the glass fiber on the surface coated with the low-viscosity mixed resin to perform secondary coating;

(4) after the step (3), curing by instant heating at a temperature of 60 to 70 캜; And

(5) performing a flattening operation with a roller immediately after being cured in the step (4) (refer to Figs. 1 and 2).

The primary or secondary coating method is preferably a centrifugal molding coating method. However, the present invention is not limited to this, but a method of external reinforcement after forming the liner layer, extrusion processing, vacuum assisted pneumatic conveying method, Depending on the type of coating, a suitable coating method may be selected.

The pipe can be selected in any shape or shape, such as a straight shape, an elbow shape, a cross shape, a tee shape, and the like.

However, the present invention is not limited thereto. The elongated pipe is preferably formed by centrifugal molding, but the present invention is not limited thereto. In the case of the above-mentioned elbow-type pipe, since it has a structure that is worn out more than a straight pipe, it is possible to laminate thickly as necessary or to attach a ceramic tile of the same component system. However, when the lamination thickness of the elbow pipe is connected to the straight pipe, the inner surface should be exactly aligned so that the underlayer is not damaged due to undercut.

The pipe may include a flange for preventing an undercut due to a deviation of an abrasion layer on the pipe connection, the flange including two grooves forming a circle from the pipe center on the contact surface, The inner grooves are for automatic center alignment, and the outer grooves are for sandwiching a sealant for preventing water leakage.

When the pipe is connected, a bridge is attached to an inner groove of a flange included in a pipe connection port, and a leakage preventing sealing agent is attached to the outer groove to connect the bridge. The material of the bridge to be attached to the inner groove is preferably nylon 6 but is not limited thereto. Nitrile butadiene rubber (NBR) is preferably used as the sealing agent used in the outer groove of the flange. However, It is possible to select an appropriate material as necessary without limiting (see Fig. 3).

The thermosetting resin stream is preferably at least one selected from a vinyl ester resin, an epoxy resin and urethane, but is not limited thereto.

The diluent is preferably an acrylic monomer in an amount of 5 to 15 parts by weight based on 100 parts by weight of the thermosetting resin. However, the diluent is not limited thereto and any diluent may be used as long as the viscosity of the thermosetting resin can be effectively lowered.

The controlled radical polymerization reaction agent controls the curing of the thermosetting resin and controls the curing of the thermosetting resin at a temperature not higher than 60 ° C. The controlled radical polymerization ) Reactant comprises from 0.3 to 1.5 parts by weight and is selected from the group consisting of nitroxide-mediated polymerization (NMP) reactants, atom transfer radical polymerization (ATRP) reactants and reversible addition- (Reversible Addition Fragmentation Chain Transfer Polymer (RAFT)), but the present invention is not limited thereto.

The wear resistant agent is preferably, but not limited to, silicon carbide, alumina beads, or both.

Preferably, the abrasion-resistant agent is mixed to 100 parts by weight of the thermosetting resin stream so as to include 200 to 600 parts by weight of the abrasion-resistant agent. However, the present invention is not limited thereto.

The glass fiber preferably includes 5 to 10 parts by weight based on 100 parts by weight of the thermosetting resin stream, but is not limited thereto.

The glass fiber is preferably in a pulverized form or a cut form, but is not limited thereto.

The abrasion-resistant agent is preferably a bead-like material. The thickness of the beads is preferably 20 to 40 mesh, 30 to 50 mesh, and 40 to 70 mesh, Minimize it.

Each blend ratio can be mixed so that the larger particles are 50-80%, the middle particles are 10-30%, and the fine particles are 10-30%.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and that the scope of the present invention is not limited thereto.

[ Example  1] Mixed resin of low viscosity and With anti-wear agent  Glass fiber-containing Compound Manufacturing

In Example 1, 7.5 parts by weight of an acrylic monomer (MMA) and 0.8 parts by weight of a controlled radical polymerization reaction agent were added to 100 parts by weight of an unsaturated vinyl ester resin to prepare a mixed resin.

A blend was prepared so as to contain silicon carbide or alumina beads in an amount of 500 parts by weight based on 100 parts by weight of the unsaturated vinyl ester resin and 5% by weight of glass fibers.

[ Example  2] Abrasion resistance The liner layer  Manufacture of straight pipe

The inner surface of the pipe was sanded, a surface mat cut to a predetermined length was attached, and the mixed resin prepared in Example 1 was put in a first coating. Then, the wear-resistant material and the glass fiber-containing blend prepared in Example 1 were added to the surface to which the mixed resin of the low viscosity was applied to secondary coating.

Thereafter, it was instantaneously heated to a temperature of about 60 캜 and cured for 90 minutes, and then a flat plate work was performed with a Teflon roller to prepare a pipe having a liner layer.

[ Example  3] Abrasion The liner layer  Manufacture of elbow pipes with fittings

The inner surface of the elbow pipe formed by filament winding was sanded, and the inner surface of the elongated pipe was laminated with a very thin surface mat and a resin not containing a wear-resistant agent. Then, , And then heat was applied to harden the elbow pipe. However, especially where the wear is expected to be severe, a ceramic tile is attached to the area, and a dough-like adhesive is applied to the tile and the tile is applied thereon.

[ Example  4] Abrasion resistance test

In Example 4, the specimen (A) having a specimen size of 100 mm × 100 mm × 8 T (conventional method in which the abrasion resistance resin 3T was laminated on a 5T laminate) and the high abrasion resistance filler specimen B ) Were prepared in the same size.

The specimen weight loss before and after sandblasting was measured after application of the same sand injection pressure (3Bar), angle (45 °), and injection time (30min) to create an environment similar to the actual conditions.

Sample A: The specimen coated with the conventional method, the specimen (30% weight ratio)

Sample B: A high-abrasion wear-resisting filler specimen was prepared by adding 500% (by weight) of abrasion-resistant filler to the resin

Measured weight reduction before and after sandblasting Sample A Sample B Sand brassing weight (a) 143.83 193.05 Weight after sandblasting (b) 142.27 192.72 Reduction amount (a-b) 1.86 0.33 The wear rate [(a-b) / a x 100] 1.27% 0.17%

As shown in Table 1, it was confirmed that the sample B in the case of the high-content wear-resistant agent sample had abrasion resistance of about 7.64 times as compared with the sample A.

Therefore, when a pipe having a liner layer made of a high abrasion resistance of the present invention is adopted, when the wear part replacement period of the conventional product is 6 months, the wear part replacement period of the present invention is about 46 months, It was expected to be durable for about 137 months when the position was changed.

Claims (13)

(1) sanding the inside of the pipe and attaching a chop mat or surface mat cut to a predetermined length;
(2) a thermosetting resin, a low-viscosity mixed resin containing 5 to 15 parts by weight of a diluent and 0.3 to 1.5 parts by weight of a controlled radical polymerization reaction agent per 100 parts by weight of the thermosetting resin, So as to be impregnated into the substrate;
(3) A blend containing 200 to 600 parts by weight of an anti-wear agent and 5 to 10 parts by weight of glass fiber is added to the surface of the low-viscosity mixed resin-coated surface with 100 parts by weight of the thermosetting resin stream, ;
(4) after the step (3), curing by instant heating at a temperature of 60 to 70 캜; And
(5) performing a flattening operation with a roller immediately after being cured in the step (4). The method of claim 1, wherein the primary or secondary coating is a centrifugal molding coating process. The method of claim 1, wherein the pipe is a straight or elbow type. The method of manufacturing a pipe according to claim 1, wherein the thermosetting resin is at least one selected from a vinyl ester resin, an epoxy resin, and urethane. The method of claim 1, wherein the diluent is an acrylic monomer. 2. The method of claim 1, wherein the controlled radical polymerization reactant is selected from the group consisting of nitroxide-mediated polymerization (NMP) reactants, atom transfer radical polymerization (ATRP) Wherein the at least one layer is at least one selected from the group consisting of a reversible addition fragmentation chain transfer polymerization (RAFT) reaction agent, and an abrasion resistant liner layer. The method of claim 1, wherein the wear resistant agent comprises a silicon carbide, alumina bead, or both. delete The method of claim 1, wherein the glass fibers are in a pulverized or intergranular form. delete A pipe having an abrasion-resistant liner layer produced according to the method of any one of claims 1 to 7 and 9. 12. The pipe of claim 11, further comprising a flange for preventing undercuts due to the deviation of the abrasion layer on the pipe connection. 13. The method of claim 12, wherein the flange includes two grooves forming a circular shape from the center of the pipe at the contact surface, wherein the inner groove is for automatic centering and the outer groove is for sealing a leak- Wherein the pipe has an abrasion resistant liner layer.

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