KR100277508B1 - Polymer concrete triple centrifugal force pipe and its manufacturing method - Google Patents

Abstract

The present invention relates to a polymer concrete triple centrifugal force tube and a method for manufacturing the same, wherein a predetermined amount of unsaturated polyester resin is mixed at a predetermined amount in a mixer and an input machine during mixing and mixing of an unsaturated polyester resin and various additives used in an intermediate layer. By adjusting the viscosity of the mixture during mixing and transportation, it is possible to prevent the mixture from adhering easily to the inner wall of the machine during the manufacturing process, and to increase the curing time by controlling the curing temperature to an appropriate high temperature during curing of the molded product. It is an object of the present invention to provide a polymer concrete triple centrifugal force tube and a method of manufacturing the same, which can shorten as well as remarkably improve strength characteristics. The present invention for achieving the above object is a centrifugal force molding mold for rotating a binder consisting of a chopped strand fiber cut to a suitable size, an unsaturated polyester resin containing a shrinkage reducing agent and a reaction initiator in a high speed A polymer concrete composition composed of a binder, fine aggregate coarse aggregate, and a filler composed of an unsaturated polyester resin containing a shrinkage reducing agent and a reaction initiator before the outer layer is completely cured in the first step, A second process of forming an intermediate layer by inserting it into a centrifugal force molding mold rotating at a high speed by an amount corresponding to the required thickness of the intermediate layer, and unsaturated unsaturated chopped strand fiber and shrink reducing agent Centrifugal force molding mall to rotate the binder composed of polyester resin and reaction initiator at high speed To a method for producing a polymer concrete triple centrifugal force tube, comprising a third step of forming the inner layer by forming the inner layer and rotating the gel until a gel state, and a fourth step of curing and curing the molded centrifugal force tube at a high temperature. In

When the polymer concrete composition is added in the second step, the binder is composed of unsaturated polyester, shrinkage reducing agent, and reaction initiator, and the mixture is partially mixed with fine aggregates, coarse aggregates, and fillers in the mixer. This is transferred to the feeder using a feed cart, and then the remaining binder is injected from the screw portion of the feeder, and then into the centrifugal force mold rotating at a high speed through the second mixing process by the mixing action of the screw rotation. It provides a method for producing a polymer concrete triple centrifugal force tube characterized in that the curing temperature at 60 to 70 ℃.

Description

A triple layered polymer concrete duct and the method of producing the same

The present invention relates to a polymer concrete triple centrifugal force tube used for sewage and a method for manufacturing the same, and more particularly, to a method for manufacturing a polymer concrete centrifugal force tube having a glass fiber layer on the inside and outside of the pipe wall. The polymer concrete triple centrifugal force tube which improved the invention of 97-40761, and its manufacturing method.

In general, sewage pipes are constructed to be divided into sewage treatment pipes and rainwater treatment pipes, and the sewage and rainwater treatment pipes have been mainly used for fume pipes and PC pipes made of cement concrete. Due to the rapid development of the tea industry, the erosion starts from the inside of the pipe due to the influence of acidic substances contained in the erosive sewage and wastewater discharged from various plant facilities. This causes the problems such as blockage of sewage pipes due to such collapse, groundwater flow and deterioration of the terminal treatment plant.

Due to these problems, synthetic resin pipes, such as PVC pipes, may be used for sewage, but synthetic resin pipes have a weak compressive strength, so they are frequently destroyed due to external pressure, and they need to be replaced frequently. If the value is high, there is a tendency to float, and the flexural rigidity is small, which may cause problems such as causing deformation.

In order to solve the above problems, the present inventor has applied for a sewage polymer concrete centrifuge tube from Korean Patent Application No. 96-5659.

According to the present invention, a centrifuge tube is prepared by preparing a centrifuge tube including an unsaturated polyester resin containing a shrinkage reducing agent, aggregates such as sand, silica sand, gravel, and fillers such as fly ash or calcium carbonate. It is made to coat | coat with a corrosion-resistant unsaturated polyester resin.

Polymer concrete centrifugal pipes according to the above-mentioned invention are still popular as general sewage pipes, but in the case of manufacturing large pipes, they have a tendency to adversely affect transportation and installation due to their thick thickness. In addition, even in the manufacturing cost, there is a problem that the market competitiveness is lowered due to the relatively high price of synthetic resin.

In this regard, techniques for reinforcing fibers are known for improving the strength of polymer concrete tubes. For example, in Japanese Patent Publication No. 47-25146, a layer of synthetic resin is placed in a centrifugal force molding machine and semi-molded, and then the glass fiber chip cut to about 25 mm is mixed with a homogeneous synthetic resin into a semi-molded synthetic resin tube. It is suggested how to continue molding with a winsim force.

Japanese Patent Laid-Open No. 50-51566 relates to a method for manufacturing a multilayer tube, and describes a method of winding a glass fiber mat impregnated with a synthetic resin on the outside of a centrifugally molded polymer concrete tube. Japanese Patent Application Laid-Open No. 54-4958 discloses a method of centrifugally molding a resin containing short fibers such as glass fibers or a microphone powder, and Japanese Patent Laid-Open No. 60-137632 reinforces a fiber having a hinge structure at one end. The present invention relates to a method for manufacturing a plastic pipe and describes a method of expanding a hinge part by adding a glass fiber mat as a reinforcing agent.

Korean Patent Application Laid-Open No. 61-21488 discloses an extrusion molding method for a method for axially paralleling the glass fibers used as a reinforcement material. The present invention describes a technique of forming a multilayer by inserting a plastic resin into a mold and introducing a synthetic resin containing glass fibers cut into the mold, and forming a multilayer. Disclosed is a method for producing centrifugal force, and discloses a method for entering into a centrifugal mold by mixing sand, calcium carbonate and the like with an unsaturated polyester resin containing glass fiber and a room temperature hardener.

However, the prior art as described above not only requires a separate impregnation process by using a glass fiber impregnated with a synthetic resin, but also shows a tendency that the glass fiber is biased due to specific gravity after impregnation, and injected into the mold during molding. There is a problem of causing an increase in production costs by requiring a separate device to make.

As a method for solving the problems appearing in the prior art as described above, the inventors of the present invention, as shown in the partially cutaway perspective view of the conventional centrifugal force tube of FIG. 1 from Korean Patent Application No. 97-40761 (hereinafter referred to as the present invention). Outer layer (D) in which chopped strand fibers (F) are immersed, middle layer (M) made of polymer concrete, and inner layer in which chopped strand fibers (F) are immersed ( D ') is used as a basic configuration, and the chopped strand fibers are cut into a rotating molding mold and dispersed, followed by shrinkage of 10 to 20% (w / w) of the total weight of the resin mixture as a binder. Insert the binder containing the reducing agent in an amount required to secure the thickness of the outer layer, and penetrate the outer layer by penetrating between the chopped strand fibers by rotating centrifugal force. A first step of forming, and a polymer concrete composed of aggregates and fillers, a binder formed of an unsaturated polyester resin containing a shrinkage reducing agent and a reaction initiator, and aggregate and filler before the outer layer of the first step is completely cured. The second step of forming the intermediate layer by inserting it into a mold rotating at a high speed by the amount corresponding to the thickness of the intermediate layer, and then the chopped strand fibers cut to a suitable length is added to disperse well The third step of demolding by inserting the amount of binder required to secure the thickness of the inner layer to rotate until the curing is completed, and maintaining the relative humidity of 50 to 60% at a temperature of 20 ± 3 ℃ Method for producing a polymer concrete triple centrifugal force tube, characterized in that it comprises a fourth step of curing and polymer concrete triple produced therefrom By providing the core tube, the tensile strength, bending strength, compressive strength, etc. are significantly higher than the existing sewage pipe, and have excellent characteristics in terms of resistance to freeze-thawing, watertightness and chemical resistance, and compared with the prior invention. It has been provided a polymer concrete triple centrifugal force tube and a method of manufacturing the same, which can greatly shorten the curing time and exhibit a remarkable improvement in productivity.

However, the inventors of the present invention have found some improvement in the manufacturing process as a result of continual research.

That is, the present inventors, as mentioned in the fourth step of the prior application, the curing temperature of the molded tubular body at the curing temperature of 23 ± 2 ° C. at room temperature, but in the case of room temperature curing, the time required for curing increases the rotation rate of the molding mold. This was low and desirable strength properties could not be obtained.

In addition, in the above-mentioned invention, after mixing the various materials such as the binder and the aggregate and the filling material in advance in the mixer during the second process for forming the intermediate layer (M) of the centrifugal force tube in a mixer, and the like The conveying means was used to feed the centrifugal force rotating at high speed through the feeder.

However, when the polymer concrete composition is manufactured by the batch mixing method, the viscosity of the polymer concrete composition becomes very high due to the property of the unsaturated polyester resin as a binder, and thus, the mixer, the feed cart, the feeder, etc. in the process before being transported to the centrifugal force mold. Since it is attached to the inner wall of the same equipment, not only the waste of materials is increased but also the washing of the various equipments used after the work is not easy, and additional costs are generated due to the excess organic detergent (acetone solvent) used in such washing process. In addition, it was found that there is a problem that causes serious environmental pollution during the rotation of acetone and polymer concrete released during washing.

The inventors have completed the present invention as a result of repeated studies to solve the above problems, the unsaturated polyester resin used in the intermediate layer during the manufacturing process of the polymer concrete triple centrifugal force tube of the present invention by the present inventors and When mixing and adding various additives, the unsaturated polyester resin is divided into certain amounts by mixing in the mixer and injector so that the viscosity of the mixture can be properly adjusted during mixing and transportation. It is possible to prevent, and to control the curing temperature at the time of curing of the molded body to provide a polymer concrete triple centrifugal force tube and a method for producing the same, which can greatly shorten the curing time and significantly improve the strength characteristics. The purpose is.

1 is a partially cutaway perspective view of a conventional centrifugal force tube

The sewage pipe manufactured by the manufacturing method of the present invention is an intermediate layer (M) made of an outer layer (D) and polymer concrete in which chopped strand fibers (F) are immersed, as shown in the prior application of FIG. 1, In addition, the inner layer (D ') in which the chopped strand fiber (F) is immersed, and the outer layer (D) and the inner layer (D') may have a super corrosion resistant coating layer.

The sewage pipe of the present invention having the basic structure as described above uses an oligo type unsaturated polyester resin having relatively low cost and excellent physical or chemical properties as a base material of a binder, and an unsaturated polyester resin used as a binder. When hardening, it is difficult to ensure the stability of the dimensions when manufacturing sewage pipes made of polymer concrete using 3 to 7% of the shrinkage when used as a binder, 10 to 10% by weight of unsaturated polyester resin to prevent the shrinkage 20% by weight of shrink reducer is added.

Regarding the amount of the shrinkage reducing agent added, the above-mentioned ratio is most suitable in order to express high strength properties in Korean Patent Application No. 95-44208, which is another prior application of the present inventors.

That is, the unsaturated polyester resin exhibits a large shrinkage of 3 to 7% upon curing, and when it is used as a binder without the addition of the shrinkage reducing agent, curing cracking occurs and it is difficult to guarantee the stability of the dimension. When the amount of shrinkage reducing agent is insufficient, it is difficult to obtain a predetermined result, and when the amount of shrinkage reducing agent is excessive, problems such as a sharp decrease in strength are caused. desirable.

The method of manufacturing the polymer concrete triple centrifugal force tube of the present invention, which is formed using the above binder as a main material, can be produced by a conventional centrifuge tube manufacturing apparatus, and is made of a suitable strand cut into a desired strand fiber. And a binder of an unsaturated polyester resin containing a shrinkage reducing agent and a reaction initiator into a centrifugal force molding mold rotating at high speed to form an outer layer, and shrinkage reduction before the outer layer is completely cured in the first step. The second step of forming the intermediate layer by inserting and rotating the polymer concrete composition composed of a binder, fine aggregate, coarse aggregate and filler composed of an unsaturated polyester resin and an initiator contained therein into the centrifugal force molding mold by an amount corresponding to the required thickness of the intermediate layer. And choked strand fibers and shrinkage reducers A third step of forming the inner layer by inserting a binder comprising an unsaturated polyester resin and a reaction initiator into a high speed rotating mold, and forming the inner layer and rotating the gel until the gel is formed; In the method for producing a polymer concrete triple centrifugal force tube comprising four steps,

When the polymer concrete composition is introduced in the second process, the binder is divided into two parts, and a part of the binder and fine aggregate, coarse aggregate, and filler are first mixed in the mixer, and then transferred to the feeder using a feed cart. In the screw portion, a binder containing a residual amount of unsaturated polyester resin is additionally injected and injected into the centrifugal force mold rotating at a high speed through a process of secondary mixing by mixing by rotating the screw. Provided is a method for producing a polymer concrete triple centrifugal force tube and a polymer concrete triple centrifugal force tube produced therefrom characterized in that the curing temperature is set at a high temperature of 60 to 70 ° C.

As described above, in the second step of the present invention, the total amount of the unsaturated polyester resin binder added is 10 to 16% (w / w) when the polymer concrete composition is added to the centrifugal force mold rotating at high speed to form an intermediate layer. First, binders 5 to 7% (w / w), sand and gravel 60 to 80% (w / w) used as fine aggregates and coarse aggregates, fly ash, calcium carbonate or stone powder as fillers 10 to 15% (w / w) ), An appropriate amount of initiator and 0.1 to 0.6% (w / w) of commonly used crosslinking agent are first mixed in the mixer and then transferred to the feeder using a feed cart, and then the remaining unsaturated polyester resin in the screw portion of the feeder. 8 to 10% (w / w) of the binder is mixed and introduced into the centrifugal force mold in a secondly mixed state by the mixing action of the screw rotation.

As described above, when the method according to the present invention is used for the preparation of the polymer concrete composition used in the intermediate layer, the content of the unsaturated polyester resin added in the first blending process is 5 to 7% (w / w). As it is relatively small, it has little adhesiveness, and thus it is possible to prevent the attachment of mechanical equipment such as the blender feed cart and the feeder hopper which are in contact during the mixing, conveying and feeding process, thereby preventing the waste of materials. Not only does it require a washing process for the same machinery, it not only improves the production efficiency, but also improves the uniformity when mixing compared to batch mixing, and it is expected to increase about 5 to 10% in terms of strength characteristics. Can be.

In the present invention, as the reinforcing material used for the outer layer and the inner layer of the tubular body, various kinds of fibers such as glass fiber, asbestos fiber, carbon fiber, etc. may be used, and a woven fabric may be used using them, but considering dispersibility and workability If so, it is preferable to use a chopped strand fiber in the form of a fiber chip, and preferably not to exceed 25 mm in length.

In the composition of the polymer concrete used in the present invention, the unsaturated polyester resin binder includes 10 to 20% (w / w) shrinkage reducing agent based on the total weight of the binder. Such shrinkage reducing agent is obtained by dissolving thermoplastic polystyrene in a styrene monomer. If more than 20% (w / w) of the unsaturated polyester resin weight is added, the cohesive density of the unsaturated polyester resin is lowered after curing, which greatly affects the strength reduction of the polymer concrete, and less than 10% (w / w). In the case of addition, 10 to 20% (w / w) of the unsaturated polyester resin weight is most suitable because the shrinkage reduction effect as intended is not achieved.

The unsaturated polyester resin used as a binder by mixing with the shrinkage reducing agent is cobalt octanoate cobalt octanoate (C _O O _C ) is added, and the ortho type (ortho type) causing a curing reaction by the initiator As the unsaturated polyester resin, the structural formula is represented by the following Chemical Formula 1.

If it is used up to about 10% of the total weight of polymer concrete, the strength increases with the increase of the weight ratio, but if it exceeds 16%, the separation, shrinkage, warpage, etc. of the resin increase not only, but also the workability of stirring and forming decreases significantly. The weight ratio of the reducing agent, the curing accelerator, and the binder composed of the unsaturated polyester resin is 10 to 16%.

In addition, the filler may be used in general, all the filler used in the plastic processing field. Fillers include calcium carbonate, stone powder, fly ash, titanium dioxide, and the like, but fillers such as titanium dioxide are expensive compounds and are relatively inexpensive because they do not exhibit particular effects in the present invention, and calcium carbonate with low absorption of resin Suitable.

Among calcium carbonates, heavy calcium carbonate is more preferable, and if the addition ratio is 15% (w / w) or more, the viscosity becomes high and the workability is worsened, and the strength after curing decreases, so that the strength after curing is 10 to 15% (w). / w) is suitable. It is more preferable that the particle size of calcium carbonate is 1 to 30 µm, the degree of powder is 2500 to 3000 cm ² / g, and the water content is less than 0.1%.

Fine aggregates and coarse aggregates used as aggregates for the manufacture of polymer concrete centrifugal force tubes should not contain organic impurities and should be dried in order to prevent the formation of a water film between the aggregate layer surrounding the aggregate to weaken the adhesion between the binder and aggregate. It is necessary to make the amount of use into 60 to 80% (w / w) in consideration of the strength after curing, and it is preferable to use a rough aggregate such as crushed stone or gravel that can pass through a 9.5 mm sieve. Do.

In general, the polymer concrete in the present invention may be used both crosslinking agents used in unsaturated polyester, but because the bond between the organic polymer matrix and the inorganic aggregate has a defect that weakens the chemical adhesive force as a crosslinking agent to solve this problem Silane is used.

The polymer concrete triple centrifugal force tube of the present invention molded by the above-described method can finally obtain the desired strength through the curing process under an appropriate temperature. The inventors have continued to study the previous application, and as a result of increasing the curing temperature to a certain degree, it was confirmed that the daily strength of the tube can be greatly improved to about 40%. Such an appropriate curing temperature range is 60 It is most preferable to keep it at more than ℃ ℃, if the curing temperature is higher than 70 ℃ not only the effect of the strength increase due to the temperature rise is very small, but also may exhibit a problem that the overall strength characteristics are greatly reduced at a high temperature above 100 ℃ It is.

In the present invention, the thickness ratio of the chopped strand fiber reinforcing layer constituting the outer layer and inner layer of the centrifugal force pipe for the purpose of improving the bending strength of the cross section of the pipe depends on the diameter of the pipe and the required external pressure strength or pressure resistance, etc. In the case of an external pressure pipe for exhibiting excellent strength characteristics against external pressure load, it has already been disclosed in Korean Patent Application No. 97-69277, which is a prior application of the present invention, that the ratio of the thickness of the outer layer to the inner layer is 1: 1.6 to 2. There is a bar. In addition, in the case where the tube is a pressure resistant tube for exhibiting excellent strength characteristics against the pressure resistance, on the contrary, it is preferable that the thickness ratio of the inner layer to the outer layer is in a ratio of 1: 1.6 to 2. The reason is that in the case of external pressure pipes, the fracture usually occurs in the vertical section of the tube, and the inner wall of the tube is tensilely yielded, causing a primary crack that causes initial cracking. This is because the bending moment generated in the vertical cross section of the tube under constant vertical load is approximately 1.6 to 2.0 times the bending moment occurring in the horizontal cross section. On the contrary, in the case of pressure-resistant pipes, the outer layer should be thicker than the inner layer at the same ratio.

Hereinafter, the present invention will be described in detail with reference to the following Examples and Test Examples.

It is noted that the unsaturated polyester resin binder used as the polymer binder in the following examples is prepared by using a weight ratio of the shrinkage reducing agent based on the total weight of 20% (w / w).

<Polymer Concrete Production Example 1>

0.56 kg of cobalt octane and unsaturated polyester binder, 1.2 kg of heavy calcium carbonate, 3.36 kg of dried dry sand, organic matter removed, 2.24 kg of four-pass crushed stone and MEKPO (methyl ethyl) manufactured by Aekyung Chemical Co., Ltd. as a standard hardening initiator. Unsaturated polyester polymer concrete was prepared by mixing 0.012 kg of DMP solution containing 55% ketone prooxide and 0.012 kg of silane in a forced mixer and mixing for 5 minutes.

<Preparation of Polymer Concrete Examples 2 to 9>

The polymer concrete was prepared in the same manner as in Preparation Example 1, but the polymer content of the unsaturated polyester binder, heavy calcium carbonate, sand and crushed stone was prepared as shown in Table 1 below.

division Unsaturated polyester binder (kg) Heavy calcium carbonate (kg) Sand (kg) Crushed stone (kg) Polymer concrete production example 1 0.48 0.96 3.65 2.43 Polymer concrete production example 3 0.48 1.04 3.55 2.37 Polymer concrete production example 4 0.56 1.12 3.46 2.30 Polymer concrete production example 5 0.56 1.20 3.36 2.24 Polymer Concrete Production Example 6 0.56 1.28 3.26 2.18

<Structural Production Example 1>

The mold was placed in a 30 cm diameter, 30 cm long, 30 cm long, rotating section at 900 RPM, and placed in a 6 to 25 mm chopped strand fiber and an appropriate amount of unsaturated polyester resin. After continuously dispersing evenly, 8 kg of unsaturated polyester polymer concrete prepared from Polymer Concrete Production Example 1 was transferred to a transfer truck, and injected into the screw portion of the injector with 0.64 kg of unsaturated polyester resin mixed by operation of the screw. It was put into a centrifugal force mold rotating at high speed in a state and rotated for about 5 minutes, and then rotated for 10 minutes by adding chopped strand fiber and an appropriate amount of unsaturated polyester resin cut to a size of 6 to 25 mm. After curing, the mold was demolded and air dried for 2 days while maintaining a temperature of 60 ° C. and a relative humidity of 20 to 30%.

<Pipe manufacturing examples 2 to 6>

Perform the same as in Example 1, the type of unsaturated polyester polymer concrete used for molding the intermediate layer during manufacture and the amount of unsaturated polyester resin injected separately into the screw as shown in Table 2 below Each polymer concrete triple centrifugal force tube was prepared.

division Types of Unsaturated Polyester Concrete Usage amount of unsaturated polyester concrete (kg) Screw Injection Unsaturated Polyester Usage (kg) Curing temperature (℃) Pipe Production Example 2 Polymer Concrete Manufacturing Example 2 8 0.48 60 Pipe Production Example 3 Polymer Concrete Manufacturing Example 3 8 0.56 60 Pipe Production Example 4 Polymer Concrete Manufacturing Example 4 8 0.56 70 Pipe Production Example 5 Polymer Concrete Manufacturing Example 5 8 0.64 70 Pipe Production Example 6 Polymer Concrete Manufacturing Example 6 8 0.72 70

<Comparative Production Example 1>

In the same manner as in Example 1 for producing the tubular body, in the formation of the intermediate layer, the unsaturated polyester resin is injected into the screw portion of the injector, and the process is performed separately. The compounded thing was used.

<Tubular body manufacturing comparative example 2>

In the same manner as in Production Example 2 of the tubular body, when the intermediate layer is formed, the unsaturated polyester resin is injected into the screw portion of the injector, and the process is performed separately. The compounded thing was used.

<Body manufacturing comparative example 3>

In the same manner as in Production Example 3 of the tubular body, when the intermediate layer is formed, the unsaturated polyester resin is injected into the screw portion of the injector, and the process is performed separately. The compounded thing was used.

<Body manufacturing comparative example 4>

It carried out similarly to Example 4 of the tubular body, but the curing temperature was 20 ℃.

<Body manufacturing comparative example 5>

It carried out similarly to Example 5 of the tubular body, and the curing temperature was 30 ° C.

<Body manufacturing comparative example 6>

It carried out similarly to Example 6 of the tubular body, and the curing temperature was 40 ℃.

<Body manufacturing comparative example 7>

It carried out similarly to Example 6 of the tubular body, and the curing temperature was 50 ℃.

<External pressure strength test example>

The specimens prepared from Examples 1 to 6 and Comparative Examples 1 to 7 described above were subjected to load at a rate of 20 kgf / sec according to the test method specified in KS F 4404. The fracture load at the time was measured and the results are shown in Table 3 below.

In the test, the centrifugal force tube specimen was placed horizontally on the pedestal, and rubber plates having a thickness of 2 mm and prescribed squares were installed on the upper and lower portions of the specimens, and H having the same size as the specimens between the squares and the load cells placed on the upper portions of the specimens. The beam was installed to distribute the load from the load cell uniformly on the specimen.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 External pressure strength (㎏f / m) 13152 12834 12935 13272 13482 13475 12500 12211 12307 11067 11500 11591 11947

As can be seen from the results of Table 1 above, when the binder is added to the centrifugal force molding as in the embodiment of the present invention and divided into the curing and curing conditions at a high temperature of 60 to 70 ℃ average strength external pressure strength 13100 kg Although it was shown as f / m or more, in the case of batch injection Comparative Examples 1 to 3 was found that the average external pressure strength is 11900kgf / m or less showed that the deterioration of the strength characteristics is very large, Example of the present invention when performing the process In the process of transferring the polymer concrete to the centrifugal mold, the adhesion of the transfer cart, the transfer and the like occurred very little. The frequency of stopping the process was frequent.

As described above, the present invention relates to the mixing and centrifugal force of the unsaturated polyester resin in a quantitative amount at the time of mixing and adding the unsaturated polyester resin and various additives used in the intermediate layer during the manufacturing process of the polymer concrete triple centrifugal force tube of the present invention. By dividing and mixing the mold in a certain amount, the viscosity of the mixture can be properly adjusted during mixing and transportation, thus preventing the mixture from easily adhering to the inner wall of the machine during the manufacturing process. It is a useful invention to provide a polymer concrete triple centrifugal force tube and a method for manufacturing the same that can greatly shorten the curing time by adjusting the strength and also significantly improve the strength characteristics.

Claims (3)

A first step of forming an outer layer by inserting an unsaturated polyester resin including a choked strand fiber and a shrinkage reducing agent and a reaction initiator cut into a suitable size into a centrifugal force molding mold rotating at high speed; Before the outer layer of the process is completely cured, the polymer concrete composition composed of a binder, fine aggregate, coarse aggregate and filler composed of an unsaturated polyester resin containing a shrinkage reducing agent and a reaction initiator and an initiator and a crosslinking agent corresponds to the thickness of the intermediate layer required. The second step of forming an intermediate layer by inserting and rotating into a centrifugal forming mold that rotates at a high speed by a quantity, and unsaturated polyester resin containing a chopped strand fiber and a shrinkage reducing agent of suitable size, and a reaction start The inner layer is formed by putting a zero-constituting binder into a centrifugal force molding mold rotating at high speed. Then in the third step of the manufacturing method of the fourth centrifugal tube 3 of polymer concrete which comprises the step of curing the molded centrifugal force and air dry average eulreul for shaping by rotating until the gel, When the polymer concrete composition is added in the second step, the binder is composed of unsaturated polyester, shrinkage reducing agent, and initiator, and the mixture is partially mixed with fine aggregate, coarse aggregate, and filler in the mixer, and then transferred. After transferring to the feeder by using a bogie, the remaining binder is injected from the screw portion of the feeder, and then into the centrifugal force mold rotating at high speed through the second mixing process by the mixing action of the screw rotation, and curing in the fourth process. Method for producing a polymer concrete triple centrifugal force tube, characterized in that the temperature is 60 to 70 ℃. According to claim 1, wherein 5 to 7% (w / w) of unsaturated polyester resin binder in the polymer concrete input in the second step, and 60 to 80% (w / w) of sand and gravel used as fine aggregate and coarse aggregate 10-15% (w / w) of fly ash, calcium carbonate or stone powder as a filler, an appropriate amount of initiator and 0.1 to 0.6% (w / w) of commonly used crosslinking agent in the mixer, and then conveyed them. After transferring to the feeder using a bogie, the remaining binder is further mixed in the screw portion of the feeder 8 to 10% (w / w) characterized in that the second mixing by the mixing action of the screw into the centrifugal force mold, characterized in that Polymer concrete triple centrifugal force tube manufacturing method. Polymer concrete triple centrifugal force tube, characterized in that produced by the method according to claim 1.