KR102435625B1 - Fiber reinforcement for concrete using composite polymer materials - Google Patents

Abstract

The present invention relates to a fiber reinforcing material for concrete using a composite polymer material, capable of improving adhesion between a fiber reinforcing material and a cement composition. The fiber reinforcing material for concrete using a composite polymer material can be obtained by melt-spinning a mixture composed of 5 to 10 parts by weight of polypropylene resin, 3 to 8 parts by weight of silica fume, 0.5 to 2 parts by weight of metakaolin, and 2 to 4 parts by weight of a flame retardant, and then stretching, performing surface treatment on and cutting the same.

Description

Fiber reinforcement for concrete using composite polymer materials

The present invention relates to a fiber reinforcement for concrete using a composite polymer material, and more particularly, to a fiber reinforcement for concrete using a composite polymer material capable of improving adhesion performance between the fiber reinforcement material and a cement composition.

In general, fiber reinforcement is mixed with a concrete cement composition and used for the purpose of reinforcing the physical properties of a concrete structure.

Recently, concrete is mixed with fiber reinforcement such as synthetic resin fibers to improve the tensile strength, durability and stability of concrete. At the construction site, a fixed amount of fiber reinforcement is supplied to the concrete mixer vehicle and mixed at the site.

In addition, in order to improve the structural performance of the fiber reinforcement, it is necessary to improve the cement composition and adhesion performance. However, in the case of synthetic fibers currently being applied for crack control, the fibers have a cylindrical shape with a smooth surface.

Therefore, it is necessary to develop a technology for improving the adhesion performance of the fiber reinforcement and the cement composition.

US 10-0857475 B1

Therefore, the present invention has been devised to solve the above problem, and synthetic resin fibers used to control plastic shrinkage and dry shrinkage cracking by being added to cement compositions such as concrete to improve structural performance in cement compositions such as concrete. Another object of the present invention is to provide a fiber reinforcement material for concrete using a composite polymer material capable of improving adhesion performance in order to be applied as a fiber reinforcement material.

Other objects and advantages of the present invention will be set forth below and will be learned by way of example of the present invention. Furthermore, the objects and advantages of the present invention may be realized by means and combinations indicated in the claims.

In order to achieve the above object, the apparatus for manufacturing a fiber reinforcement for concrete using a composite polymer material according to the present invention is 5 to 10 parts by weight of polypropylene resin, 3 to 8 parts by weight of silica fume, and 0.5 to 2 metakaolin an extruder for melt-extruding a mixture consisting of parts by weight and 2 to 4 parts by weight of a flame retardant; a spinning machine which extrudes and spins the extruded material melt-extruded by the extruder using a spinning nozzle to form a filament yarn; a cooling water tank containing cooling water for cooling the filament yarn extruded and spun by the spinning machine; a primary stretching machine for stretching the filament yarn cooled in the cooling water tank at a rate of 150 to 260% at a speed of 5 to 100 m/min of a three-stage stretching roller; a heating unit for heating the filament yarn that has passed the process of the primary stretching machine to a range of 150 to 260°C; a secondary stretching machine for stretching the filament yarn passing through the process of the heating unit at a rate of 300 to 1000% at a speed of 60 to 400 m/min of a three-stage stretching roller; a surface forming part for forming an embossing part on the filament yarn that has passed the process of the secondary stretching machine; a cooling unit for cooling the filament yarn formed in the surface forming unit; It is characterized in that it comprises a cutting part for obtaining a fiber reinforcement for concrete by cutting the filament yarn cooled in the cooling part to a predetermined length.

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In addition, the filament yarn formed in the surface forming part is formed in a strip shape having an embossing part protruding upward or recessed downwardly by pressing the upper and lower surfaces in the longitudinal direction, and the embossing part includes a lattice structure type or pyramid structure with concavo-convex projections and concave-convex grooves And, the concave-convex groove is a process of forming a first concave-convex groove of a first depth by adjusting the pressure of the surface forming part, an aging process of solidifying for 10 to 20 seconds, and adjusting the pressure of the surface forming part after the aging process It is characterized in that it is formed through the process of forming a second concave-convex groove having a second depth greater than the first depth at the position of the first concave-convex groove.

In addition, it is characterized in that the filament yarn is cut to a length of 20 to 65 mm in the cut portion.

In addition, the temperature of the extruder for melting the mixture is 180 to 260 ℃ to melt, and the temperature of the spinning machine is set to 180 to 260 ℃ characterized in that the spinning.

In addition, the heating temperature of the three-stage stretching roller is characterized in that the temperature of the primary stretching roller is 80 ~ 90 ℃, the temperature of the secondary stretching roller 92 ~ 105 ℃, the temperature of the third stretching roller 110 ~ 130 ℃ range.

As described above, according to the present invention, since the fiber reinforcing material is formed in a strip shape having an embossing portion protruding upward or depressed downward by pressing the upper and lower surfaces in the longitudinal direction, the adhesion performance between the fiber reinforcement material and the cement composition can be improved. have.

1 is a schematic configuration diagram showing an apparatus for manufacturing a fiber reinforcement for concrete using a composite polymer material according to the present invention;
2 is a view for explaining the configuration of a three-stage stretching roller according to the present invention,
3 is a cross-sectional view of a fiber reinforcement for concrete using a composite polymer material manufactured according to the present invention;
4 is a view for schematically explaining a process of forming an embossing unit according to the present invention.

The details of other embodiments are included in the detailed description and drawings.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and in the following description, when a part is connected to another part, it is not only directly connected It also includes cases where other media are interposed in between. In addition, in the drawings, parts not related to the present invention are omitted to clarify the description of the present invention, and the same reference numerals are assigned to similar parts throughout the specification.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a schematic configuration diagram showing an apparatus for manufacturing a fiber reinforcement for concrete using a composite polymer material according to the present invention, FIG. 2 is a diagram for explaining the configuration of a three-stage stretching roller according to the present invention, FIG. 3 is It is a cross-sectional view of a fiber reinforcement for concrete using a composite polymer material manufactured according to the present invention, and FIG. 4 is a view for schematically explaining a process of forming an embossing part according to the present invention.

Referring to FIG. 1 , an apparatus for manufacturing a fiber reinforcement for concrete using a composite polymer material according to the present invention includes an extruder 10 , a spinning machine P, a cooling water tank 20 , and a primary stretching machine 30 . And, it is configured to include a heating unit 40, a secondary stretching machine 50, a surface forming unit 60, a cooling unit 70, and a cutting unit (80).

In the extruder 10, a mixture comprising 5 to 10 parts by weight of polypropylene resin, 3 to 8 parts by weight of silica fume, 0.5 to 2 parts by weight of metakaolin, and 2 to 4 parts by weight of a flame retardant is melt-extruded.

In the spinning machine (P), the extrudate melt-extruded by the extruder (10) is extruded and spun using a spinning nozzle to form a filament yarn.

Here, silica fume, metakaolin and flame retardants may provide an effect of improving flexural strength and toughness, resistance to abrasion and fire resistance.

At this time, in order to maximize the melt extrusion and extrusion spinning of the filament yarn, the temperature of the extruder 10 for melting the mixture is 260 to 290 ° C., and the temperature of the spinning machine (P) is 180 to 260 ° C. It is preferable to do

In the cooling water tank 20, cooling water for cooling the filament yarn extruded by the spinning machine P is received to cool the extruded filament yarn.

Preferably, in order to maximize the cooling efficiency, the temperature of the lower side of the cooling water in the cooling water tank 20 is 5 to 30°C, and the temperature of the water surface can be controlled to be distributed to 40-50°C.

In the primary stretching machine 30, the filament yarn cooled in the cooling water tank 20 is drawn at a speed of 5 to 100 m/min of a three-stage drawing roller at a rate of 150 to 200%.

In the heating unit 40, the filament yarn that has passed the process of the primary stretching machine 30 is heated in a range of 150 to 260°C.

In the secondary stretching machine 50, the filament yarn that has passed the process of the heating unit 40 is secondarily stretched at 300 to 1000% at a speed of 60 to 400 m/min of the three-stage stretching roller.

In the surface forming unit 60, heat and pressure are applied to the surface of the filament yarn that has passed through the process of the secondary stretching machine 50 to form the embossing unit 130, which will be described later.

The cooling unit 70 cools the filament yarn formed in the surface forming unit 60 .

In the cutting unit 80, the filament yarn cooled in the cooling unit 70 is cut to a predetermined length to obtain a fiber reinforcement for concrete, and then it is subjected to a paving process.

For example, in the cut 80, the filament yarn is cut to a length of 20 to 65 mm.

Referring to FIG. 2 , a configuration for controlling the heating temperature of the three-stage stretching roller applied in the primary stretching machine 30 and the secondary stretching machine 50 is presented.

In one embodiment of the present invention, the heating temperature of the three-stage stretching roller in the primary stretching machine 30 and the secondary stretching machine 50 is the temperature of the primary (1st) stretching roller 80 ~ 90 ℃, the secondary (2nd) The temperature of the stretching roller is 92 ~ 105 ℃, the temperature of the third (3rd) stretching roller can be controlled in the range of 110 ~ 130 ℃.

Preferably, the temperature of the primary (1st) stretching roller is 85°C, the temperature of the secondary (2nd) stretching roller is 99°C, and the temperature of the third (3rd) stretching roller is 120°C.

When explaining the reason for forming the heating temperature of the stretching roller to be sequentially high from the first stage to the third stage, the stretching becomes difficult because there is nothing to stretch as the stretching goes through the section. Therefore, if the temperature and the draw ratio are excessive or insufficient, the filament yarn breakage or the finished product of the fiber reinforcement material may become excessively hard. It is to use a method of stretching to a slightly finer part at a high temperature. If the stretching is performed while increasing the temperature in this way, the uniformity of the finished product of the fiber reinforcement material is increased, and there is an advantage in that the stretching can be raised to the maximum.

On the other hand, the interval between the stretching roller of the upper portion and the stretching roller of the lower portion is 40 ~ 60 cm, from the first stage to the third stage, the inclination angle of the stretching roller of the upper portion and the stretching roller of the lower portion may be in the range of 30 ~ 35 °.

Referring to FIG. 3 , the fiber reinforcement for concrete 100 using the composite polymer material according to the present invention is pressed by the surface forming part 60 in the longitudinal direction, so that the concavo-convex part (R) of the surface forming part 60 is pressed. (preferably, microgrooves having a size of several tens of μm may be formed) form a strip shape having the embossing portion 130 protruding upward or recessed downward.

The embossing part 130 includes a lattice structure type or pyramid structure of concave-convex grooves 110 and concavo-convex projections 120 .

For example, the concave-convex groove 120 is, as shown in FIG. 4 , a first concave-convex groove 110a of a first depth (t=1/2) by the concavo-convex part R of the surface forming part 60 . ) forming the process (S10), the aging process (S20) of solidifying for 10 to 20 seconds, and the first concave-convex groove (110a) by the concavo-convex part (R) of the surface forming part 60 after the aging process (S20) ) may be formed through the process of forming the second concave-convex groove 110b having a second depth (t=1) deeper than the first depth (t=1/2).

Here, the aging process (S20) is a process of solidifying the corresponding portion while the first concave-convex groove 110a is formed. Through this, the physical properties of the fiber reinforcement 100 are improved and the second concave-convex groove 110b to be carried out later. can facilitate the formation of

As described above, in the present invention, the concave-convex groove 110 is formed by a two-step process like the formation of the first concave-convex groove 110a and the second concave-convex groove 110b, whereby a more stable concave-convex groove 110 can be formed. , therefore, there is an advantage in that the adhesion performance between the fiber reinforcement and the cement composition can be improved through the concave-convex groove 110 .

In another embodiment, the concave-convex groove 110 may be formed using a laser system (not shown) that oscillates a femtosecond laser. In this case, a pressing means for pressing the fiber reinforcement 100 up and down may be separately required, but the advantage of being able to form the fine concavo-convex grooves 110 in units of several hundred μm or less (preferably in units of several tens of μm) or in units of nm have.

Here, the femtosecond laser is an improved laser than the nano-class laser, has a pulse width of about several femtoseconds or more, and when amplified, it is a laser that can output an instantaneous output corresponding to terawatt (=1012W). Recently, ultra-fine processing technology is being applied to

Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims described below rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. should be interpreted

10: extruder
P: thrower
20: coolant tank
30: primary stretching machine
40: heating part
50: secondary stretching machine
60: surface forming part
70: cooling unit
80: cut part
100: fiber reinforcement
130: embossing part

Claims (6)

delete an extruder for melt-extruding a mixture consisting of 5 to 10 parts by weight of polypropylene resin, 3 to 8 parts by weight of silica fume, 0.5 to 2 parts by weight of metakaolin, and 2 to 4 parts by weight of a flame retardant;
a spinning machine which extrudes and spins the extruded material melt-extruded by the extruder using a spinning nozzle to form a filament yarn;
a cooling water tank containing cooling water for cooling the filament yarn extruded and spun by the spinning machine;
a primary stretching machine for stretching the filament yarn cooled in the cooling water tank at a rate of 300 to 1000% at a speed of 5 to 100 m/min of a three-stage stretching roller;
a heating unit for heating the filament yarn that has passed through the process of the primary stretching machine to a range of 150 to 260°C;
a secondary stretching machine for stretching the filament yarn passing through the process of the heating unit at a rate of 300 to 1000% at a speed of 60 to 400 m/min of a three-stage stretching roller;
a surface forming part for forming an embossing part on the filament yarn that has passed the process of the secondary stretching machine;
a cooling unit for cooling the filament yarn formed in the surface forming unit;
An apparatus for manufacturing fiber reinforcement for concrete using a composite polymer material, characterized in that it comprises a cutting part for obtaining a fiber reinforcement for concrete by cutting the filament yarn cooled in the cooling part to a predetermined length. 3. The method of claim 2,
The filament yarn formed in the surface forming part is formed in a strip shape having an embossing part protruding upward or depressed downwardly by pressing the upper and lower surfaces in the longitudinal direction, and the embossing part comprises a lattice structure type or pyramid structure irregularities and concave-convex grooves, The concave-convex groove is formed by adjusting the pressure of the surface forming unit to form a first concave and convex groove of a first depth, an aging process of solidifying for 10 to 20 seconds, and adjusting the pressure of the surface forming unit after the aging process to form the first concave-convex groove An apparatus for manufacturing a fiber reinforcement for concrete using a composite polymer material, characterized in that it is formed through a process of forming a second concave-convex groove having a second depth deeper than the first depth at the position of the first concave-convex groove. 3. The method of claim 2,
An apparatus for manufacturing a fiber reinforcement for concrete using a composite polymer material, characterized in that the filament yarn is cut to a length of 20 to 65 mm in the cutting part. 3. The method of claim 2,
The temperature of the extruder that melts the mixture is 180 to 260 ° C., and the temperature of the spinning machine is set to 180 to 260 ° C. and spinning. 3. The method of claim 2,
The heating temperature of the three-stage stretching roller is a composite polymer material, characterized in that the temperature of the primary stretching roller is 80 ~ 90 ℃, the temperature of the secondary stretching roller is 92 ~ 105 ℃, and the temperature of the third stretching roller is 110 ~ 130 ℃ A device for manufacturing fiber reinforcement for concrete.

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