KR101335659B1 - Method for manufacturing structural reinforcing polymer fiber - Google Patents

Abstract

The present invention relates to a method for producing a structural polymer fiber for reinforcing concrete, and aims to manufacture a polymer fiber having a property suitable for structurally reinforcing concrete by a simplified manufacturing process and having excellent performance.
In order to accomplish the above object, the present invention provides a method of manufacturing an extruder, comprising the steps of: (a) injecting a fiber material into a cylinder of an extruder and melt-extruding using a screw; (b) spinning the melt extruded material with fibers using a head of an extruder; (c) cooling the radiated fibers using a cooler; (d) first stretching the fiber-cured fiber using a first stretching roller; (e) patterning the concavo-convex pattern on the fiber passed through the oven using a concavo-convex machine; (f) stretching the fiber having passed through the concavo-convex portion by using a second stretching roller; And (g) cutting the fiber having passed through the second stretching roller using a cutter; .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing a structural polymer fiber for reinforcing concrete,

The present invention relates to a method for producing a structural polymer fiber for reinforcing concrete, and more particularly, to a method for producing a structural polymer fiber for reinforcing concrete, which is capable of suppressing the growth of cracks generated in concrete and mixing with concrete in order to reinforce properties such as deflection and bending performance. The present invention relates to an apparatus and a method for producing a structural polymer fiber, and a polymer fiber produced thereby.

Generally, cement materials such as mortar, concrete, shotcrete and plaster (hereinafter, referred to as 'concrete'), which are materials based on cement and lime, are used in a variety of applications such as rapid breakage due to brittle properties and cracking due to drying / It has disadvantages.

One of the methods to reinforce these disadvantages is to incorporate fibers into the mixing process of the cement. In order to secure the performance, concrete with reinforcing fibers has been developed and used.

Structural fibers are fibers that are incorporated into concrete to improve tensile and flexural properties as well as cracks.

Generally, polymer fibers refer to artificial fibers made from synthetic polymers as raw materials. Depending on the type of synthetic polymer, polyester fibers, polyacrylonitrile fibers, polyamide fibers, polyvinyl chloride fibers, polyurethane fibers, polyolefin fibers, And the like.

These polymer compounds are prepared by spinning a solution by melting, solution, or emulsion, and have thermoplasticity that melts at high temperatures.

On the other hand, in relation to the technology relating to the production of high-strength polymer fibers, numerous applications and disclosures have been made in addition to Korean Patent Laid-Open No. 10-2009-0060098 (hereinafter referred to as "prior art").

As shown in FIG. 1, a method for producing a high-strength fiber using a high-molecular-weight polypropylene resin according to the prior art is characterized in that a high-molecular-weight polypropylene resin, Preparing a mixed solution by dissolving the mixed mixture; Step II) of spinning the mixed solution to form an undrawn yarn; And extracting the solvent in the undrawn yarn with an extracting agent, stretching and then heat setting to complete the fiber; .

However, conventional polymer fiber manufacturing methods such as the prior art have a problem of requiring a lot of energy, time, and a relatively large working space because they undergo a lot of heating and stretching processes.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a polymer fiber having excellent physical properties and structural properties for reinforcing concrete by a simplified manufacturing process.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided an apparatus for manufacturing a structural polymer fiber for reinforcing concrete, comprising: a cylinder of an extruder into which a fiber material is fed; A screw of an extruder for melt extruding the material; A head of an extruder for spinning melt extruded material into fibers; A cooler for curing the fibers; A first stretching roller and a second stretching roller for reinforcing the elasticity and strength of the fiber; An oven for applying heat required for stretching between the first and second elongating rollers; A sputtering machine for deforming a shape of a fiber to improve adhesion of concrete and fiber; And a cutting machine for cutting the fiber passed through the unevenness; .

The present invention also relates to a method for manufacturing a structural polymer fiber for reinforcing concrete, comprising the steps of: (a) injecting a fiber material into a cylinder of an extruder and melt-extruding the fiber material using a screw; (b) spinning the melt extruded material with fibers using a head of an extruder; (c) cooling the radiated fibers using a cooler; (d) first stretching the fiber-cured fiber using a first stretching roller; (e) patterning the concavo-convex pattern on the fiber passed through the oven using a concavo-convex machine; (f) stretching the fiber having passed through the concavo-convex portion by using a second stretching roller; And (g) cutting the fiber having passed through the second stretching roller using a cutter; .

Further, in the step (a), the fiber material may be a polyolefin-based material.

Further, in the step (a), the fiber material is melt-extruded through a screw heated to 200 to 300 캜.

Further, in the step (b), the fibers are irradiated through a head nozzle having a diameter of 1 to 5 mm.

In the step (c), the cooling temperature of the cooler for cooling the radiated fibers is 10 to 35 占 폚.

Further, after the step (d), the step (d-1) is carried out using an oven to apply heat required for stretching; And further comprising:

The heating temperature of the oven is 120 to 180 ° C.

The steps (d) and (f) are characterized in that the drawing is performed by a difference in rotational speed between the first elongating roller and the second elongating roller.

The ratio of the rotational speed difference between the first and second elongating rollers is 6 to 12.

Further, in the step (e), the corrugated rollers are characterized by using wavy or serrated rollers.

The concavo-convex pattern is characterized in that a micro-pattern is engraved.

According to the present invention, by performing the single fiber stretching process, it is possible to improve the energy and spatial efficiency by simplifying the process of manufacturing the structural polymer fiber for reinforcing concrete, and to provide polymer fiber having properties suitable for reinforcing concrete There is an effect that can be produced.

According to the present invention, by forming a micro unit pattern on the concavo-convex pattern, the surface of the synthetic synthetic fiber can be roughly processed to produce the structural polymer fiber having excellent adhesion with concrete.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a conventional method of producing a high strength polypropylene fiber. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing a structural polymer fiber for reinforcing concrete.
3 is an overall flow chart of a method for manufacturing a structural polymer fiber for reinforcing concrete according to the present invention.
FIG. 4 is a graph of stress-displacement curve according to the stretching ratio of the structural polymer fiber for reinforcing concrete according to the present invention.
Fig. 5 is an example of a micro-unit pattern of a structural polymer fiber for reinforcing concrete according to the present invention. Fig.
Fig. 6 is a photograph of a drawing device for drawing a specimen made of multifilament of a structural polymer fiber for reinforcing concrete with a micro unit pattern according to the present invention. Fig.
7 is a side view showing a plastic plate for drawing test of a structural polymer fiber for reinforcing concrete according to the present invention.
8 is a front view showing a specimen for pulling test of a structural polymer fiber for reinforcing concrete according to the present invention.
FIG. 9 is a graph showing the extraction energy of short fibers according to the fiber type of the high-strength mortar of the structural polymer fiber for reinforcing concrete according to the present invention.

Specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. It is to be noted that the detailed description of known functions and constructions related to the present invention is omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

An apparatus and method for producing a structural polymer fiber for reinforcing concrete according to the present invention and a polymer fiber produced by the method will be described with reference to FIG. 2 to FIG.

The structural polymer fiber for reinforcing concrete according to the present invention is produced by extruding by means of an extruder, followed by stretching at a difference in rotation speed of the rollers.

[Step 1] Melt extrusion of the material (S10).

Homopolypropylene, which is a material of the structural polymer fiber, is charged into the cylinder 1 of the extruder in accordance with the capacity, and the charged material is melt-extruded by using a screw 2 heated to 200 to 300 캜.

[Second step] Spinning (S20).

The homopolypropylene melt extruded through the screw 2 is spun into fibers using a head 3 having a nozzle hole having a diameter of 1 to 5 mm (S20).

At this time, it is possible to have different cross-sectional shapes depending on the shape of the nozzle hole.

[Third step] Cooling (S30).

The fibers radiated through the head 3 are cooled using a water-cooled or air-cooled cooler 4 (S30).

At this time, the fibers radiated through the head 3 are rapidly hardened through the cooler 4. On the other hand, in the case of the water-cooling type cooler 4, the temperature of the cooling water tank is set at 10 to 35 ° C to prevent the fibers from being hardened to an excessively low temperature or being hardened completely due to high temperature.

[Fourth step] First stretching (S40).

And the fiber that has been cooled and hardened through the cooler 4 is first stretched using the first stretching roller 5.

 [Step 5] Heating (S50).

Between the first and second elongating rollers 5 and 7 an oven 6 is required to heat the sheet for stretching and a heat of 120 to 180 ° C is applied to the fibers passing through the oven 6 To be evenly distributed.

 [Step 6] Patterning of irregularities (S60).

Structural polymer fibers usually have smooth surfaces and hydrophobic properties.

Therefore, in order to facilitate attachment of the concrete to the fibers, the shape of the irregularities is patterned on the fibers passing through the oven 6 by using a weaving machine 8 using wavy or serrated rollers.

In addition, a pattern of micrometric unit is engraved on the surface of the hoist machine 8. Thus, the fiber also has a rough surface similar to a filament or sandpaper, and the adhesion performance is further improved.

[Seventh step] Second stretching (S70).

And the fiber that has passed through the spindle 8 is secondly drawn by using the second stretching roller 7. [

The first stretching process and the second stretching process may be performed by a difference in rotational speed between the first stretching roller 5 and the second stretching roller 7, Elasticity.

In homopolypropylene, which is different depending on the material, the highest tensile strength and elasticity are exhibited when the ratio of the rotational speed difference of the rollers (stretching ratio) is 6 to 12.

Thus, the polymer fibers produced have a tensile strength of 400 to 700 MPa and an elastic modulus of 5 to 10 GPa.

[Step 8] Cutting (S80).

The fiber having passed through the second stretching roller 7 is cut to a predetermined length by using a cutting machine 9. [

Hereinafter, the present invention will be described more specifically based on experimental examples. It is to be understood, however, that these examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[Experimental Example 1]

According to the present invention, the structural polymer fiber (100) for reinforcing concrete was produced as homopolypropylene under the above conditions, and the tensile strength was measured according to the strength and test method of KS K 0412 filament yarn.

Stretching cost 6 7 8 9 Tensile Strength (MPa) 282 373 554 531 Elastic modulus (GPa) 5 5.8 8 8.3

The tensile strength test method is as follows.

The tensile strength is measured by measuring the strength and elongation by setting the tensile speed to (30 ± 2) cm / min when the fiber is placed on a constant speed ornament tester so that the distance between the clamps is 25 cm, do.

The test is excluded when the fiber is cut off several times in the grip and the fiber is cut off to prevent slip when the fiber is mounted.

In the present example, the strength and elasticity of the structural polymer fiber 100 produced according to the stretching ratio were measured. The results are shown in Table 1 and FIG. 4.

[Experimental Example 2]

In order to improve the adhesion performance of the structural polymer fiber 100 for reinforcing concrete, the polymer fibers having a pattern of micro units as shown in FIG. 5 are selected and the 'METHOD OF TEST FOR BOND OF FIBERS' Test specimens were prepared by mixing the specified reference mortar as shown in [Table 2], and the adhesion test was carried out.

Kinds W / C Cement / sand ratio (weight) High strength 0.50 1: 1.7 Low intensity 0.65 1: 1

The adhesion test method is as follows.

As shown in Fig. 6 and Fig. 7, one or four holes were drilled in a plastic plate 210 for dividing both specimens having a thickness of 0.5 mm, and for this purpose, 8, the mortar 220 is formed on both sides of the plastic plate 210, as shown in FIG. 8, after four polymer fibers 100 are sandwiched between the single polymer fibers 100 for multi- And the fibers are adhered to the inside of the mortar 220.

After 28 days from the production of the test specimen, the test specimen is placed in the drawing apparatus and the test is carried out at a loading speed of 0.5 mm / min using a displacement control type UTM.

Then, the curve of the load-slippage is obtained by a data acquisition system to obtain the maximum drawing load and the drawing energy (interfacial toughness) by the area of the curve.

In order to confirm the adhesion performance of the reinforcing structural polymer fiber 100 having the fiber shape as in the present invention, it is preferable to use the general straight type and flexure type which are used for improving the bending performance of the conventional concrete as shown in [Table 3] 9 shows a result of a comparative experiment comparing the crimped type.

As can be seen from [Table 3] and FIG. 9, the drawing energy of the reinforcing structural polymer fiber 100 in which the micro unit pattern is engraved is superior to the conventional fibers.

That is, it can be seen that the concrete and adhesion performance are excellent.

In addition to the structural polymer fiber for reinforcing concrete made of homopolypropylene, it can also be used for various materials such as copolymer, PVA and PET.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be appreciated by those skilled in the art that numerous changes and modifications may be made without departing from the invention. Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

1: cylinder of the extruder 2: screw of the extruder
3: Head of extruder 4: Cooler
5: first stretching roller 6: oven
7: second stretching roller 8: spool
9: Cutting machine
100: Structural polymer fiber for reinforcing concrete
210: plastic plate 220: mortar

Claims (13)

delete A method for producing a structural polymer fiber for reinforcing concrete,
(a) feeding a polyolefin-based fiber material into a cylinder 1 of an extruder, and melt-extruding the fiber material through a screw 2 heated to 200 to 300 캜;
(b) spinning the melt extruded material through the head (3) of the extruder into fibers through a head (3) nozzle having a diameter of 1 to 5 mm;
(c) cooling the radiated fibers to 10 to 35 DEG C using the cooler (4);
(d) first stretching the fiber-cured fiber using the first stretching roller (5);
(e) patterning the irregularities on the fibers passing through the oven (6) using a weaving machine (8);
(f) a second elongation of the fibers having passed through the weaving machine (8) using a second elongating roller (7); And
(g) cutting the fiber having passed through the second stretching roller (7) using a cutting machine (9); , ≪ / RTI &
After the step (d)
And (d-1) applying heat required for stretching to 120 to 180 DEG C by using an oven (6).
delete delete delete delete delete delete 3. The method of claim 2,
The steps (d) and (f)
Wherein the stretching is performed by a difference in rotational speed between the first stretching roller (5) and the second stretching roller (7).
10. The method of claim 9,
Wherein the ratio of the rotational speed difference between the first elongating roller (5) and the second elongating roller (7) is 6 to 12. The method for producing a structural polymer fiber for reinforcing concrete according to claim 1,
3. The method of claim 2,
In the step (e)
The method for producing a structural polymer fiber for reinforcing concrete according to claim 1, wherein the hoisting machine (8) uses a wavy or serrated roller.
3. The method of claim 2,
The method for manufacturing a polymer fiber for structural reinforcement for concrete according to claim 1, wherein the weaving machine (8) is engraved with a micro unit pattern.
delete

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