JP2009046648A - Reinforced cured article and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cured article which can highly suppress the widening of cracks, exfoliation of broken pieces or excessive deformation in the cured article, by shaping such an organic fiber like a melt-spun organic fiber having a circular cross section as could be easily drawn out even if blended with a hydraulic cured article such as cement concrete, mortar, slate or the like or with a high-polymeric cured article such as plastics and rubbers, to a form which is excellent in the physical adhesion to the cured body, by means of an easy and low cost processing method of a thermal or dynamical method, and then by blending them, and to provide a manufacturing method thereof. <P>SOLUTION: The method comprises mixing and formulating in a curing article a specific twisted yarn obtained by fixing thermally under tension a specific twisted yarn composed of an organic fiber of polyamide, polyester, polyvinyl alcohol, etc. having a glass transition temperature of 313 K or higher, or a coil formed-twisted yarn of a low order or single fiber obtained by disintegrating the specific twisted yarn after the thermal fixation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reinforced cured body and a method for producing the same, and more particularly, a reinforced cured body such as cement concrete, mortar, and slate, and a cured polymer body such as plastic and rubber, each reinforced with organic fibers. More specifically, a reinforced cured body in which a shape excellent in physical resistance (physical adhesiveness) against pulling out from a cured body is formed into an organic fiber and blended with the cured body And a manufacturing method thereof.

  Structures made of hydraulic hardened materials such as cement concrete, mortar, and slate, which are cured by a hydration reaction, have excellent compressive strength, but are inferior in tensile strength, bending strength, and impact strength, and asbestos for slate reinforcement Formulation causes serious health damage.

  In addition, steel fibers, carbon fibers, and alkali-resistant glass fibers are blended to reinforce such hardened bodies, but steel fibers are weight and rust problems, carbon fibers are price problems, and alkali-resistant glass fibers are long-term stable. Therefore, there is a demand for blending organic fibers that are lightweight, inexpensive, and flexible.

  On the other hand, in plastics and rubbers called polymer cured bodies, organic fibers are blended mainly in rubber products such as tires, belts and hoses, and some plastic products are also reinforced by blending organic fibers. Has been implemented.

  In the blending of organic fibers into the cured body, the cross-sectional shape and thickness do not change along the length direction, except for exceptions such as blending of polyvinyl alcohol fibers with good adhesion to cement into the cemented cured body. Since the fiber is easily pulled out from the cured body, there is a problem that the potential reinforcing effect cannot be exhibited.

In order to cope with this pull-out problem, a polyolefin reinforcing tape for cement reinforcement embossed on the surface (see Patent Document 1), and a fiber for cement reinforcement that has been stretched by applying unevenness by changing the take-up speed of melt spinning (Patent Document) 2), a polyolefin fiber for concrete reinforcement whose cross-sectional area varies irregularly along the length direction (see Patent Document 3), and for reinforcing an inorganic hardened body having a portion having a wide width or a large diameter. Polyvinyl alcohol fiber (refer to Patent Document 4), corrugated polypropylene short fiber for lightweight concrete reinforcement (refer to Patent Document 5), and fiber for cement reinforcement formed by twisting a polyacetal short fiber having a flat cross section (Patent Document) 6), a material for reinforcing a cured body having a monofilament surface coated with a resin and having at least one protrusion (patent text) 7), short fibers for reinforcing a hydraulic cured body in which discontinuous protrusions are formed on the fiber surface (see Patent Document 8), and fibers for reinforcing a polymer cured body in which the fiber diameter changes along the fiber direction (patent Cement mortar reinforcing variant in which a concrete reinforcing fiber having an improved sinusoidal shape (refer to Patent Document 10) and parallel filament yarns are connected together at appropriate intervals in the yarn length direction. A method has been proposed and implemented in which a special shape is formed on a fiber such as a fiber (see Patent Document 11) to improve the physical adhesion of a compounded fiber to a cured body.
Japanese Patent Publication No.58-18343 Japanese Patent Publication No.61-301 Japanese Examined Patent Publication No. 62-4346 Japanese Patent Publication No. 1-338065 JP 2001-192279 A JP 2001-261403 A JP 2004-149991 A U.S. Pat. No. 4,297,414 U.S. Pat. No. 4,574,108 US Pat. No. 5,981,630 US Pat. No. 6,177,195

  However, in order to improve the physical adhesiveness of the blended fiber to the cured body, the techniques disclosed in each of the above-mentioned patent documents often require a special spinning and processing method, and therefore are inferior in production cost and production efficiency. There is a need for a simple and low-cost processing method that can form a shape excellent in physical adhesiveness with high efficiency even if it is a thick fiber having weak adhesive strength to a cured body.

  As a result of diligent research on pulling out of organic fibers blended in the cured body, the pulling out of the cured body proceeds by breaking the cured body (destructive pulling), and the smooth pulling proceeds without destroying the cured body. It became clear that pulling out (sliding pulling out) or pulling out in which both processes proceed simultaneously occurred.

  The object of the present invention is to break and slip from a hydraulic cured body or a polymer cured body by an easy and low-cost processing method using a thermal or mechanical method even for an inexpensive organic fiber having a circular cross section. By shaping the shape with excellent resistance to both pull-outs and holding the shaped shape in the cured body, the cracked width of the cured body, debris peeling, or excessive deformation is highly suppressed. It is to provide a reinforced hardened body that can be manufactured and a simple manufacturing method thereof.

  In order to solve the above problems, the present invention has the following configuration.

  (1) A specific twisted yarn composed of an organic fiber having a glass transition temperature of 313 K or higher is heat-set under tension and then cut, and the cut specific twisted yarn is mixed and blended with an uncured material of a cured body, and the uncured material It was set as the manufacturing method of the reinforcement hardening body which hardens | cures.

  (2) In the method for producing a reinforced cured body according to (1), the specific twisted yarn is defibrated after the specific twisted yarn is heat-fixed and mixed with the uncured material. .

  (3) In the method for producing a reinforced hardened body according to (1), the specific twisted yarn is defibrated simultaneously with mixing and mixing.

(4) In the method for producing a reinforced cured body according to the above (1) to (3), the specific twisted yarn is a primary twisted yarn of an organic fiber having a circular cross section, and the cross-sectional area ratio of the organic fiber constituting the specific twisted yarn is It is in the range of 1 to 4, and the number of organic fibers constituting the specific twisted yarn is any number from 2 to 10.

(5) In the method for producing a reinforced cured body according to (4) above, the number of organic fibers constituting the specific twisted yarn is any number from 2 to 4.

(6) It was set as the reinforcement hardening body manufactured by the manufacturing method of the reinforcement hardening body in any one of said (1)-(5).

In addition, the defibration of the twisted yarn in the present invention means that the heat-fixed specific twisted yarn is separated into a coil-shaped low-order twisted yarn or a single fiber by the process of the present invention or by newly adding a defibrating process. To do.

  Furthermore, the heat fixation in the present invention is to heat a specific twisted yarn composed of organic fibers having a glass transition temperature higher than room temperature of 313K or higher to a temperature higher than the glass transition temperature under tension to plastically deform the fibers into a shape in the twisted yarn, It means to cool and harden below the glass transition temperature and fix the shape, and must be performed under tension where the twisted yarn does not loosen by tension.

  In addition, in this invention, it calls a fiber from the filament yarn with a continuous length to a short fiber, and sets the temperature range of 273K (about 0 degreeC) -313K (about 40 degreeC) to normal temperature.

  Moreover, the mixing | blending mixing | blending in this invention means the process of disperse | distributing a reinforcing fiber with the movement in an unhardened material by methods, such as stirring.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the reinforcement hardening body which can suppress highly the crack widening of a hardening body, debris peeling, or excessive deformation | transformation, and its simple manufacturing method.

Hereinafter, embodiments of the present invention will be described . First, reference examples that have led to the present invention will be described. 1 and 2 are process diagrams showing an example of a method for producing a reinforced cured body according to this reference example .

The method for producing a reinforced cured body according to this reference example relates to a method for producing a reinforced cured body using organic fibers, as shown in FIG. 1, a crushing step of crushing a twisted yarn made of organic fibers to obtain a crushed twisted yarn, and And a blending step of mixing or embedding the crushing twisted yarn in an uncured material, and a curing step of curing the uncured material blended with the crushing twisted yarn.

  In other words, using a twisted structure of organic fibers, a shape excellent in physical adhesion to the cured body is shaped into the organic fibers by a crushing process (mechanical) in which the twisted yarn is pressed and crushed to plastically deform the twisted yarn. This is blended into an uncured body and cured to produce a reinforced cured body.

  In the crushing step, it is preferable to uniformly crush the twisted yarn along its length direction in order to improve work efficiency.

  Moreover, although the crushing twisted yarn may be blended directly into the uncured material, the crushing twisted yarn can be defibrated in advance between the crushing step and the blending step. Alternatively, in the mixing and blending step, the crushing twisted yarn may be mixed into the uncured material and simultaneously the crushing twisted yarn may be defibrated. Here, the disentanglement of the crushing twisted yarn means separation into a low-order deformed twisted yarn or a deformed single fiber.

  Further, in the case of a specific twisted yarn composed of an organic fiber having a glass transition temperature of 313 K or more, for example, as shown in FIG. A heat setting step of heat setting the specific twisted yarn, and the crushing step can be performed between the tension step and the blending step.

  That is, in the process of heat-fixing the specific twisted yarn under tension and then cutting and blending the cut twisted yarn into the uncured material, the specific twisted yarn is crushed by the procedure shown in FIG. 2, for example.

  In FIG. 2A, there is a crushing process between the tensioning process and the heat setting process. In FIG. 2B, there is a crushing process between the heat setting process and the cutting process. In FIG. The crushing process is performed after the cutting process. Furthermore, in FIG.2 (b), the process of heat setting may be performed again between a crushing process and a cutting process.

  Also in this example, it is preferable that the step of crushing the specific twisted yarn is a step of uniformly crushing the specific twisted yarn along its length direction. Further, the specific twisted yarn may be defibrated from after both the heat setting step and the crushing step until blended into the uncured material, or the specific twisted yarn may be defibrated simultaneously with the blending blending.

  FIG. 3 shows an example of a specific shape of a crushed twisted yarn obtained by the above-described method or a deformed single fiber obtained by opening the crushed twisted yarn. FIG. 3A shows a crushed twisted yarn 1 obtained by uniformly crushing a twisted yarn composed of two organic fibers along its length direction, and FIG. 3B shows this crushed twisted yarn 1. It is the partial side view which looked at the deformation | transformation single fiber 2 obtained by defibration from the pressurization direction at the time of crushing.

  Such a crushed twisted yarn or deformed single fiber is blended into an uncured material in a state before being cured in a hydraulic cured body such as cement concrete, mortar, or slate, or in a polymer cured body such as plastic or rubber, and then cured. By doing so, it is possible to produce a reinforced hardened body capable of highly suppressing crack widening, debris peeling, or excessive deformation of the hardened body.

FIG. 4 shows a process diagram in another reference example .

As another reference example in the manufacturing method of the reinforced cured body described above, as shown in FIG. 4, as the pre-process of the blending step, the crushed twisted yarn, or a deformed twisted yarn obtained by defibrating the crushed twisted yarn, It further includes a reinforcing body manufacturing step of manufacturing a reinforcing body with deformed single fibers, and in the blending step, the reinforcing body manufactured in the reinforcing body manufacturing step can be embedded and blended in the uncured material.

Moreover, as a modification of the other reference example, in the crushing step, the reinforcing body produced with the twisted yarn is pressurized to crush the twisted yarn, and in the blending step, the twisted yarn crushed in the crushing step is included. The reinforcing body can be embedded in the uncured material. Here, the reinforcing body is a reinforcing cord composed of reinforcing fibers, a mesh sheet, a web, a nonwoven fabric, a knitted fabric, a woven fabric, and the like.

In addition, in this reference example , in order to make the length and magnitude | size which mix | blend a reinforcement fiber and a reinforcement with an uncured material, the process of cut | disconnecting a fiber shall be added suitably.

  The reinforced cured body obtained by each of the above-described production methods is an excellent cured body having high tensile strength, bending strength, and impact strength, whether it is a hydraulic cured body or a polymer cured body.

As described above, in this reference example , using a twisted structure of organic fibers, a crushing process (mechanical) in which the twisted thread is pressed along the length direction to plastically deform the twisted thread, or a heat fixing process By combining the crushing process (thermal and mechanical), a shape with excellent physical adhesion to the cured body is formed on the organic fiber, and a crushing twisted yarn is defibrated as necessary. A deformed twisted yarn structure or a low-order deformed twisted yarn obtained by defibrating the twisted yarn or a reinforcing fiber having a deformed single fiber structure is produced, and the reinforcing body composed of the reinforcing fiber or the reinforcing fiber is used as an uncured material. It is characterized by blending and curing the uncured material.

Therefore, according to this reference example , by a simple processing method using a twisted yarn structure, a crush-deformed shape excellent in physical adhesiveness with a hydraulic cured body or a polymer cured body can be formed into an organic fiber. By blending with a hardened or polymer hardened body, it is possible to highly suppress crack spreading, fragment peeling, or excessive deformation of the hardened body.

Hereinafter, the manufacturing method of the reinforcement hardening body which concerns on this reference example is further explained in full detail.

  First, the organic fiber constituting the twisted yarn will be described.

The spiral shape formed on the fiber by twisting may be deformed or disappear due to the action of external force in the untwisting process due to the elastic force of the fiber or mixing into the uncured material, but the fiber in the crushing process in this reference example The shape in which the cross-sectional shape changes along the length direction is retained until the uncured material is cured, and imparts excellent physical adhesion to the cured body to the fiber. Accordingly, the organic fiber material used in the crushing process for obtaining a crushing twisted yarn is not particularly limited.

  On the other hand, an organic fiber having a glass transition temperature of 313 K or higher is used in the heat setting step. This applies to organic fibers of a wide range of materials, including polyamide-based (including nylon 6 where 313K has a glass transition temperature), polyester-based inexpensive fibers, and polyvinyl alcohol fibers that have a proven record in reinforcing cement-based cured bodies.

In this reference example , in the heat setting process of the specific twisted yarn composed of the organic fibers described above, the twisted yarn is heated to the glass transition temperature or higher, so that the constituent fibers are relaxed by the orientation of the amorphous molecular chains and the partial melting of the fine crystals. It becomes soft and plastically deforms into a shape in a twisted yarn under tension, and is cooled and cured below the glass transition temperature, thereby fixing the shape of the fiber. Moreover, since the fiber which has a glass transition temperature of 313K or more is hard at normal temperature below the said temperature, the hydraulic hardening body hardened by stirring and mix | blending an inorganic component and water at normal temperature, and the thermosetting cured at normal temperature Alternatively, when a polymer cured body such as a water-soluble resin is reinforced by mixing and mixing the fibers, the crushed spiral shape formed by the heat setting and crushing process is easily retained, and along the length direction. Combined with the changing cross-sectional shape, it imparts excellent physical adhesion to the cured body to the fiber.

  When the heat setting process under tension is performed before crushing, the effect of facilitating the crushing process is achieved by suppressing the untwisting of the heat-set specific twisted yarn and separation of the constituent fibers, and the heat under tension. When the fixing step is performed after crushing, there is an effect such as shaping the crushing twisted yarn into a straight line.

The shape of the organic fiber may be a circular cross section, or may be an odd cross section such as an ellipse, a triangle, a square, a star, or a Y-shaped cross section. Furthermore, the organic fiber may have a cross-sectional shape, a cross-sectional area change, a bend, a surface unevenness, and the like along the length direction. In the method according to this reference example , even if it is an organic fiber having a circular cross section without cross-sectional area change, bending, and surface unevenness produced by melt spinning with high production efficiency, it has a shape excellent in physical adhesion to a cured body easily. Can be shaped.

  Also, the thickness of the organic fiber is not limited, but if the fiber is excessively thin, there is a problem of forming a fiber ball especially when the fiber is long, and if the fiber is excessively thick, the mechanical properties in the cured body Since different materials of these materials locally agglomerate and a problem arises in that the strength of the cured product other than the tensile strength and bending strength is reduced, the material may be appropriately selected in consideration of the problem.

  For example, when processing and blending organic fibers having a circular cross section, a general fiber having a diameter of 0.01 to 3 mm is preferably used from the viewpoint of price and performance. When a thin reinforcing fiber is mixed and blended with an uncured material, adjustment such as shortening the length is required to keep the central axis of the crushing deformed fiber linear.

  Next, the twisted yarn will be described.

  The twisted yarn may be composed only of organic fibers of the same kind of material, or may be composed of organic fibers of different materials (for example, polyamide and polyester).

In this reference example , a twisted yarn in which a plurality of fibers are twisted right or left is a primary twisted yarn, each constituent yarn is a primary twisted yarn or a single fiber, and a plurality of the constituent yarns are twisted right or left. The twisted yarn including at least one primary twisted yarn is defined as a secondary twisted yarn. Further, higher-order twisted yarns are defined similarly. In addition, the twisted yarn which comprises the said twisted yarn in a secondary or more twisted yarn is called a low-order twisted yarn, and the primary twisted yarn which comprises the said secondary twisted yarn corresponds in a secondary twisted yarn. FIG. 5 shows a specific example of the definition of the twist order in the present reference example with the secondary twisted yarn 3, the lower-order primary twisted yarn 4 constituting the secondary twisted yarn, and the single fiber 5 constituting the primary twisted yarn. As shown.

The upper limit of the number of twists is the maximum number at which the process of this reference example can be stably operated without the fibers being cut at the time of twisting. When the next twisted yarn is used, if the number of twists is equal to or less than that obtained by the following formula, the twisted yarn is hardly broken.

Fiber made from nylon 66
0.37d ^-1 n ^-1 (t / m)
Fiber made from polyethylene terephthalate (PET)
0.25d ^-1 n ^-1 (t / m)
Where d is the diameter of the fiber (m), n is the number of fibers to be twisted, and the above equation is broken when n is in the range of 2 to 10 so that the portion of the fiber that is not helically deformed or small in deformation is kept low. The upper limit of the number of twists is provided. However, the number of twists is not limited to the value calculated by the above formula. The number of twists is appropriately selected according to the material of the fiber, the cross-sectional shape, the thickness, the configuration of the twisted yarn, the length of the reinforcing fiber, the blending method, and the like.

  The shape of the twisted yarn contact surface of the pressure member includes a flat surface and a curved surface. Moreover, the crushing process of the twisted yarn may be performed in a plurality of times. Furthermore, the crushing of the twisted yarn may be performed continuously along the length direction of the twisted yarn, or may be performed discontinuously at intervals.

  However, considering the production efficiency, it is possible to carry out with high efficiency, and therefore, a process of uniformly crushing the twisted yarn along the length direction is preferable.

  To uniformly crush the twisted yarn along the length direction means to crush the twisted yarn thickness in the pressurizing direction so as to be continuously thinned uniformly. However, it does not need to be exactly uniform and may vary around the average thickness. The twisted thickness at each position along the length direction of the twisted yarn is the distance between planes when a small section including at least one twist of the highest order twisted yarn in the vicinity of the position is sandwiched between two planes perpendicular to the pressing direction. Means distance. Therefore, crushing the twisted yarn to make it uniformly thin is to make the twisted thickness uniform regardless of the position along the length direction of the twisted yarn, but the pressing surface in the small section has an uneven structure. Must remain. Further, when rotation around the axis of the twisted yarn occurs in the continuous crushing process of the twisted yarn, the crushing direction may change along the length direction of the twisted yarn. When the thickness of the twisted yarn is reduced by crushing, first, the crossing part of the fibers in the pressing direction and the low-order twisted yarn is plastically deformed into a partially crushed shape. At this stage, the twisted yarn spreads perpendicularly to the pressing direction, and the concavo-convex structure remains on the pressing surface of the twisted yarn. By such crushing deformation, the fiber is shaped so that the cross-sectional shape changes along the length direction, and the physical adhesion between the fiber and the cured body is significantly improved. Furthermore, even if it is a case where it mix | blends holding a twisted-yarn structure, a crushing twisted yarn has the outstanding physical adhesiveness with respect to a hardening body by the uneven structure of a pressurization surface (refer Fig.3 (a)).

Moreover, if it is a crushing deformation | transformation of the said level, the crushed twisted yarn can also be defibrated (refer FIG.3 (b)). In the present reference example , the step of uniformly crushing the twisted yarn along the length direction means a step of crushing and deforming the twisted yarn and the constituent fibers. In addition, the high-pressure press process in which the pressing surface is a flat and smooth surface has a shape in which the twisted yarn is inferior in physical adhesion to the cured body, is difficult to be defibrated, and does not correspond to the crushing of this reference example .

  The step of uniformly crushing the twisted yarn along the length direction is, for example, compressing the twisted yarn sandwiched between two flat plates by narrowing the interval between the flat plates to the desired twisted yarn thickness, or reducing the interval to the desired twisted yarn thickness. It is carried out by a method of passing twisted yarn between two set rollers.

  The tension of the specific twisted yarn at the time of heat fixing does not fix the length of the twisted yarn, but may be a level that does not cause the twisted yarn to loosen. The heat fixing of the specific twisted yarn may be performed by simultaneously fixing the twisted yarn and the low-order twisted yarn in the second or higher-order twisted yarn, or may be performed prior to the heat setting of the low-order twisted yarn. The high temperature body that heats the specific twisted yarn in the heat setting may be in any state or shape such as gas (gas thermostat, hot air, etc.), liquid (liquid thermostat, etc.), and solid (flat plate, curved body, etc.). The heating temperature should be an arbitrary temperature from the glass transition temperature of the organic fiber to the melting temperature of the crystal part, and a temperature at which the fiber under tension is not cut or damaged by heat. In general, the temperature range from the glass transition temperature to melting is wide, for example, about 200K for polyamide synthetic fiber nylon 66 and about 190K for PET of synthetic synthetic fiber. The heating time varies depending on the material of the organic fiber, the configuration of the twisted yarn, the heating method, the high temperature body temperature, and the like, but may be a time during which heat is transmitted to the entire twisted yarn and the fiber is not cut or damaged. Generally, the higher the temperature, the faster the heat is transferred to the fiber, which is suitable for high-speed processing. The low-temperature body that cools the specific twisted yarn (medium that takes heat away from the twisted yarn) can be any state or shape such as gas (gas thermostat, cold air, air, etc.), liquid (liquid thermostat, etc.), solid (flat plate, curved body, etc.) It may be. Moreover, the cooling temperature should just be below a glass transition temperature. The cooling time varies depending on the material of the organic fiber and the composition of the twisted yarn, the cooling method, the low temperature body temperature, the twisted yarn temperature, etc., but if the temperature of the organic fiber falls below the glass transition temperature and the shape in the twisted yarn is fixed Good. Generally, even if exposed to air, it cools and hardens instantly. In addition, you may perform the process of heat-setting the specific twisted yarn under tension in multiple times.

  By the way, the twisted yarn may be processed only in the crushing step, and in the specific twisted yarn, the heat fixing step under tension and the crushing step may be combined. Furthermore, the crushing process of the twisted yarn may be performed under any condition under tension or non-tension. However, in the crushing step, when it is necessary to suppress fiber untwisting or separation of constituent fibers, crushing is performed under tension. For polyolefin fibers such as polyethylene and polypropylene that have a glass transition temperature below freezing point and are soft even at room temperature, the twisted yarn twisted at room temperature can be crushed at room temperature and under no tension if the structure of the twisted yarn is appropriate.

  Moreover, in the processing method which combines the crushing step and the heat setting step under tension in the specific twisted yarn, the crushing step is performed before being mixed under heat and before being mixed with the uncured material. If it is a heat-set twisted yarn, it is difficult for the twisted yarn to be untwisted and the constituent fibers to be separated even after cutting, and the crushing process is easy to carry out even under non-tension. When the crushing process of specific twisted yarn is divided into multiple times and combined with the heat setting process, each divided crushing process is under tension, before the first heat setting, until mixing and blending into the uncured material You may divide into steps. Furthermore, heating and crushing in heat setting can be performed at the same time, such as transferring heat required for heat setting from a heated pressure body to the twisted yarn. The temperature at the time of crushing a specific twisted yarn should just be below the melting point of the fiber which comprises a twisted yarn, and may be higher or lower than the glass transition temperature of a fiber. If it is above the glass transition temperature, it can be easily crushed and is suitable, but if the fiber material and twisted yarn structure are appropriate, it can be crushed with a low load even if it is below the glass transition temperature. In addition, when crushing a secondary or higher twisted yarn, the twisted yarn and the low-order twisted yarn may be crushed simultaneously, or the low-order twisted yarn may be crushed in advance.

  The crushed twisted yarn may be blended while maintaining the twisted yarn structure, or may be blended by defibrating into a low-order deformed twisted yarn or a deformed single fiber after the twisted yarn is blended into the uncured material. The crushed and cut twisted yarn can be defibrated by rubbing with a material that easily undergoes elastic deformation such as rubber at room temperature. Furthermore, when reinforcing a hardening body by mixing mixing | blending, you may disentangle a crushing twist yarn at the time of mixing mixing | blending. As a method of defibrating when the cement-based hardened body is mixed into the uncured material, it is possible to advance the defibration by mixing and blending in advance into a fine aggregate or a mixture of fine aggregate and coarse aggregate. Further, a part of the crushed twisted yarn may be defibrated before mixing, or the crushed twisted yarn may be partially defibrated, and mixed and mixed so that the defibrating further proceeds at the time of mixing. By defibration and mixing, the reinforcing fibers are more uniformly dispersed in the cured body. Note that the crushed twisted yarn may be defibrated in which part of the twisted yarn is defibrated, or the twisted yarn is partially defibrated from the end, and the remaining portion maintains the twisted yarn structure.

By the way, the mixing and mixing in this reference example means that the reinforcing fiber is mixed with the movement inside the uncured material by a technique such as stirring, and specifically, cement concrete, mortar, slate, etc. A step of stirring and kneading the cured material and the reinforcing fiber with a mixer or hand kneading to disperse the reinforcing fiber in the uncured material, a step of stirring and dispersing in the polymer uncured material, and the like are applicable. When a plurality of components such as cement concrete, mortar, and slate are mixed to obtain an uncured material, reinforcing fibers may be mixed and mixed at any stage of the component mixing process. In addition, the process of spraying the uncured material and the reinforcing fiber together by spraying also corresponds to the mixing blending.

  On the other hand, the embedded composition is a step of installing the reinforcing fiber or the reinforcing body in the uncured material without stirring, or adhering or impregnating the uncured material of the polymer cured body to be reinforced to the reinforcing fiber or the reinforcing body. It means the process to make. Crushing twisted yarn or low-order deformed twisted yarn or deformed single fiber obtained by defibrating the twisted yarn, or reinforcing cord made from the twisted yarn, deformed twisted yarn, or deformed single fiber, mesh sheet, web, nonwoven fabric, knitted fabric, A reinforcing body such as a woven fabric may be embedded in the uncured material. Furthermore, there is a method in which a wire or planar reinforcing body made of twisted yarn is pressurized, the twisted yarn constituting the reinforcing body is crushed and deformed, and the reinforcing body is embedded in an uncured material. In order to suppress the deformation due to heat shrinkage, it is desirable that the embedding compound in the uncured material is embedded in the tension, in order to suppress deformation due to the heat shrinkage, particularly when the fiber is heat-shrinked. .

Produced by the present reference example, the length and size of the reinforcement of the reinforcing fibers to be blended in the cured product, the reinforcing fiber and the reinforcing member is suitably formulated to cure body, excellent physical adhesion to the cured body The length and size having the property are appropriately selected.

The cured body in this reference example is a cement, gypsum or other hydraulic inorganic substance cured by a hydration reaction, and a thermosetting resin, a thermoplastic resin, a water-soluble resin cured by a crosslinking reaction, temperature change, drying, etc. Organic or inorganic polymer substances such as rubber. In addition, uncured materials are mixed fluids of water and inorganic components for hydraulic cured bodies, and crosslinking and vulcanization curing (thermosetting resins and rubbers), cooling and curing (thermoplastic resins), drying for polymer cured bodies. It means a fluid such as liquid, powder, plastic body, etc. before curing (water-soluble resin), and can be shaped by a mold and has a characteristic of being able to incorporate reinforcing fibers.

In more detail, hydraulic cements include ordinary Portland cement, early strength Portland cement, super early strength Portland cement, moderately hot Portland cement, white Portland cement and other Portland cement, blast furnace cement, silica cement, fly ash cement, etc. There are special cements such as mixed cement, alumina cement and super fast cement. Examples of gypsum include type II anhydrous gypsum, α-type hemihydrate gypsum, and β-type hemihydrate gypsum. Furthermore, hydraulic hardened bodies containing coarse aggregates such as river gravel and crushed stone, fine aggregates such as river sand, crushed sand and quartz sand, artificial lightweight aggregates, and other reinforcing fibers (metal, such as cement concrete and mortar) Fiber, carbon fiber, glass fiber, organic fiber, etc.), hardened cured body, AE agent, water reducing agent, accelerator, retarder, quick setting agent, thickener, foaming agent, foaming agent, fine powder, prevention The hydraulic hardening body which mix | blends other additives, such as a rust agent, also becomes the object of reinforcement of this reference example .

The thermosetting resin cures the liquid or powder before the crosslinking reaction (consisting of other functional low molecular weight compound or initial condensation reaction intermediate and catalyst) by causing intermolecular crosslinking by heating or the action of the catalyst. , Phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin, polyurethane resin and the like. Thermoplastic resins cure fluids or plastics heated products by cooling, such as polyolefin (polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, EVA resin, ABS resin, polyester resin, polyamide resin, polyacetal, etc. is there. The water-soluble resin is cured by drying an aqueous solution in which the resin is dissolved, and examples thereof include cellulose derivatives such as methyl cellulose, polyvinyl alcohol, polyacrylamide, polyethyleneimine, polyacrylic acid soda, polyethylene oxide, and polyvinylpyrrolidone. Rubber is cured by vulcanization or crosslinking, and includes natural rubber and synthetic rubber. Synthetic rubber includes styrene-butadiene rubber, butadiene rubber, isoprene rubber, butyl rubber, and ethylene-propylene rubber. Cured polymer blended with coarse aggregates, fine aggregates, artificial lightweight aggregates, etc. (polymer concrete, mortar) and other reinforcing fibers (metal fibers, carbon fibers, glass fibers, organic fibers, etc.) Body (fiber reinforced plastic; FRP), plasticizer, stabilizer, antistatic agent, flame retardant, filler, colorant, foaming agent, lubricant, nucleating agent, coupling agent, hydrolysis inhibitor, fluorescent whitening agent Further, a polymer cured product containing other additives such as a voltage breakdown preventing agent and an infrared absorber is also an object of reinforcement in this reference example . In addition, the reinforcing fiber such as the reinforcing fiber or the reinforcing fiber of this reference example , a mesh sheet, a web, a nonwoven fabric, a knitted fabric, a woven fabric or the like is bonded to existing concrete or a rubber member such as a tire or a belt. When the material is reinforced, the polymer (thermosetting resin adhesive, rubber latex, etc.) that is cured by adhering to or impregnating the reinforcing fiber or reinforcing body as an adhesive is also excellent in the physical adhesion of the reinforcing fiber of this reference example . To make a cured polymer reinforced by embedding compounding. Incidentally, it is of course, the hydraulic cured body and the polymer cement concrete mixed with polymeric cured product, the reinforcement subject of the cured product is also present embodiment, such as mortar.

The blending ratio of the reinforcing fibers to the uncured material in the state before the effect of the cured body varies depending on the type of the cured body, the blending method, the purpose, etc., and is appropriately selected. Further, for example, a primary heat twine made from a small number present organic fibers crushed to each component fiber shape adapted to the purpose, such as to re-heat by twisting a plurality of crushing twisting after shaping, the reference The fiber processed by the method of the example may be retwisted, and heat setting and crushing deformation may be repeated as necessary. Further, in the production process of the crushed reinforcing fiber and the reinforcing body composed of the reinforcing fiber, the fiber is appropriately cut or embedded in order to make the reinforcing fiber and the reinforcing body have a length and size to be blended with the uncured material. Other processing steps may be added to the basic steps constituting this reference example , such as bundling fiber bundles by resin adhesion or partial fusion in reinforcing fibers having a twisted yarn structure. In addition, for twisted yarns twisted with organic filament yarn, equipment that continuously performs processes such as crushing, cutting, and heat fixing, defibration, etc., which are also added as necessary, in an optimal order, It can be constructed by improving existing equipment for textile processing.

Incidentally, in the manufacturing method of reinforcing a cured product according to the reference example has been described above, when using a specific twisted yarn having a glass transition temperature consists of more organic fibers 313 K, or if there Ri not necessarily include the crushing step, from this that The present invention has been made .

That is, a specific twisted yarn composed of an organic fiber having a glass transition temperature of 313 K or more is heat-set under tension, and then cut, and the cut specific twisted yarn is mixed and mixed in an uncured material of a cured body, It is a manufacturing method of the hardening hardening body which hardens | cures.

This is because a specific twisted yarn composed of an organic fiber having a glass transition temperature higher than room temperature of 313K or higher is heated to a temperature higher than the glass transition temperature under tension to plastically deform the fiber into a helical shape, and then cooled and cured to a temperature lower than the glass transition temperature. A specific twisted yarn that has been heat-fixed as necessary by shaping the fiber into a spiral shape with excellent physical adhesiveness to the cured body by a heat-setting process (thermal and mechanical) that fixes the shape. A step of defibrating is added before or after cutting, and a heat-fixed twisted yarn structure or a coil-shaped low-order twisted yarn obtained by defibrating the specific twisted yarn or a reinforcing fiber having a single fiber structure is produced, By mixing and blending reinforcing fibers into the uncured material and curing the uncured material, a method of manufacturing a reinforced cured body that can highly suppress crack spreading, debris peeling, or excessive deformation of the cured body. is there

Hereinafter, an embodiment of a method for producing a reinforced cured body according to the present invention will be described in detail.

In addition, the meaning of tension and the order of the twisted yarn are the same as in the reference example described above , and defibration means that the heat-set specific twisted yarn is separated into coil-shaped low-order twisted yarn or single fiber.

In addition, the shape and thickness of the organic fiber, the number of twisted yarns, the heat setting of the twisted yarns, the requirements and suitable conditions, and the type of the cured object to be reinforced by the blending are the same as in the reference example described above. is there.

  Furthermore, the twisted yarn may be composed of only organic fibers of the same material as long as the glass transition temperature is 313 K or higher, or may be composed of organic fibers of different materials (for example, polyamide and polyester). .

In this embodiment , a hydraulic cured body that stirs and mixes an inorganic component and water at room temperature and a polymer cured body such as a thermosetting or water-soluble resin that cures at room temperature are reinforced by mixing the fibers. In some cases, the fiber has a characteristic that the helical shape of the fiber formed by heat fixation is easily maintained. The present inventor made a coarse aggregate (large size) of nylon 66 and PET coil-shaped single fibers having a diameter of 0.235 mm and a length of 30 mm obtained by defibration after shaping a helical shape by a method of heat fixing specific twisted yarn. 20-20 mm crushed stone) and fine aggregate (0.1-0.5 mm dry sand) in an equal volume mixture, and the mixture is stirred at high speed (22 times / As a result of investigating the change in the shape of the fiber, it was confirmed that the spiral shape (coil shape) and the linear fiber axis (spiral center axis) formed on the fiber are retained. In addition, when a fiber becomes thin, in order to hold | maintain a fiber axis | shaft linearly, adjustment, such as shortening length, is required.

  In addition, when a plurality of low-order twisted yarns are twisted into a high-order twisted yarn in a secondary or higher specific twisted yarn, the configuration of each low-order twisted yarn, the twist direction (right twist, left twist), and the number of twists are different from each other. However, it is preferable to twist a low-order twisted yarn in the same twist direction in a direction opposite to the common twist direction to obtain a high-order twisted yarn. When the twisting directions of the low-order twisted yarns are different from each other, the number of twists of the low-order twisted yarn having the same twisting direction as that of the high-order twisted yarn is increased and the number of twists of the low-order twisted yarn in the reverse direction is decreased. Moreover, when the low-order twisted yarn of the same twist direction is twisted in the same direction as the common twist direction, an excessive twist may be newly added to the low-order twisted yarn.

  When the specific twisted yarn is a primary twisted yarn, the cross-sectional area ratio (maximum cross-sectional area / minimum cross-sectional area of the fiber) and the number of the constituent fibers are not limited. A range of 1 to 4 is preferable, and a preferable number in the bundle of the cross-sectional area ratios is any number from 2 to 10, more preferably any number from 2 to 4. When the cross-sectional area ratio is larger than this range, even when two organic fibers having a circular cross section are twisted, a thick fiber that does not deform becomes a core, and a thin fiber is wound around. Further, when the number of cross-sectional area ratio bundles is large, the number of fibers is surrounded by other fibers and is located at the center of the twisted yarn, and therefore there is a portion of a fiber that is not helically deformed or deformed little even when twisted. The said part may be limited to a specific fiber, and may transfer to a different fiber according to the place of twisted yarn. Since the part of the fiber is not suitable for forming the spiral shape by heat fixing of the twisted yarn, it is technically required to keep the fraction of the part low. When twisting a bundle of organic fibers having a cross-sectional area ratio in the range of 1 to 4 and having a circular cross section, the fibers are uniformly helically deformed in a bundle of 2 to 4 fibers, but a bundle of 5 to 10 fibers. Then, the fraction of the part increases to the 10% range, and when the number of the parts further increases, the fraction of the part approaches rapidly to 30%.

In the present embodiment , it is not necessary for the reinforcing fibers to maintain a twisted yarn structure, and it is preferable from the viewpoint of homogeneous blending that the lower order, more desirably, the fibers are fibrillated and dispersed in a cured body. Further, the low-order twisted yarn or single fiber has a coil shape, and the amount per one fiber of the cured body that resists the breaking stress acting in the central axis direction is the surface between the fibers in the twisted yarn structure before defibration. As compared with the case where the hardened body part exists only in the groove, the resistance against breakage pull-out is increased. Furthermore, in the case where the specific twisted yarn is a primary twisted yarn of an organic fiber having the same diameter and circular cross section, joint pull-out of the constituent fibers occurs at a low tension, and the physical adhesion between the twisted yarn and the cured body is reduced. Sometimes.

  As described above, the twisted yarn structure of the reinforcing fiber is not necessarily an optimal structure from the viewpoint of the reinforcing effect such as homogeneous blending and pull-out prevention. It is desirable to disperse the cured body in the form of a low-order twisted yarn or single fiber. It is preferable that all twisted yarns are defibrated for defibration of the twisted yarns. However, some twisted yarns are defibrated, or the twisted yarns are partially defibrated from the ends, and the remaining part maintains the twisted yarn structure. Good. Debonding of heat-fixed specific twisted yarn is more likely to occur as the bundle of fiber bundles is weaker, and as the number of constituent fibers of the twisted yarn increases, the volume fraction of the part where the fibers are not helically deformed or deformed is small. It becomes weaker because it becomes higher, and it becomes weaker as the number of twists of the twisted yarn is smaller.

The defibration process of the heat-set specific twisted yarn may be performed at any stage from heat setting to mixing and blending into the uncured material. The temperature for defibration may be equal to or lower than the melting point of the material, but the defibrating process is preferably performed at a temperature equal to or lower than the glass transition temperature of the material in order to maintain the spiral shape before defibration. The twisted yarn after cutting can be defibrated without plastic deformation of the spiral shape of the single fiber by rubbing with a material that is easily elastically deformed such as rubber at room temperature. That is, the specific twisted yarn is defibrated between the time when the specific twisted yarn is heat-fixed and the time when the specific twisted yarn is mixed and mixed in the uncured material.

Furthermore, the heat-fixed specific twisted yarn may be defibrated during mixing. That is, the specific twisted yarn is defibrated simultaneously with the mixing and blending.

  As a method of defibrating the twisted yarn when the cement-based hardened body is mixed into the uncured material, it can be mixed in advance in a fine aggregate or a mixture of fine aggregate and coarse aggregate to further advance the defibration. Alternatively, some twisted yarns may be defibrated before mixing, or the twisted yarn may be partially defibrated and mixed and mixed so that defibration further proceeds at the time of mixing. In addition, in the case of mixing and blending a reinforcing fiber having a twisted yarn structure in which the number of constituent fibers is small and the number of twists is large and the binding between the constituent fibers is strong, the blending and blending in which the original twisted yarn structure is maintained may be used.

  By the way, deformation may occur to the extent that the helical pitch increases due to defibration before or at the time of mixing. However, in order to maintain excellent physical adhesion to the cured body, each single fiber is fixed by heat fixing of a specific twisted yarn. It is preferable that the periodic spiral shape shaped to be maintained during the defibrating process.

The length of the reinforcing fiber produced by the method of the present embodiment and mixed and blended with the cured body is a length having the physical fiber that is appropriately mixed and blended with the cured body and has excellent physical adhesion to the cured body. Is appropriately selected.

The mixing ratio of the reinforcing fibers to the uncured material varies depending on the type and purpose of the cured body and is appropriately selected. Moreover, the fiber processed by the method of this embodiment may be retwisted, and heat setting may be repeated as necessary. In addition, for the specific twisted yarn twisted with the organic filament yarn, the equipment that continuously performs the steps such as heat fixing, cutting and defibration added as necessary, which also leads to cost reduction, is the existing fiber processing It can be constructed by improving the equipment.

  Hereinafter, the present embodiment will be described with reference to examples and comparative examples.

In this example, the following two types of circular cross-sectional organic fibers were used as the strands of the test yarn.
Fiber A: Material; nylon 66, average diameter; 0.235 mm, average strength; 954 MPa
Fiber B: Material; PET average diameter; 0.235 mm Average strength; 926 MPa

Embodiment Table 1 Example 1 shows each data of Comparative Example 1, Example 2, and Comparative Example 2.

(Supplementary explanation of Table 1 )
1) The order of a test yarn composed of one fiber is expressed as a single fiber.
2) The maximum tension is the maximum tension acting on the single fiber of the test yarn during the physical adhesion test. (Tension applied per single fiber when the test yarn is pulled out or cut)
3) The maximum stress is a value obtained by dividing the maximum tension by the single fiber cross-sectional area.
4) * indicates that the test yarn was cut outside the cured body during the test, and the numerical values required for pulling out are equal to or greater than those shown in the table (tension and stress at the time of cutting). The difference in mechanical adhesion cannot be evaluated.

[Example 1]
Table 1 shows the data.

(Test yarn production)
Test yarns 1 to 5 were prepared by heat-fixing the specific twisted yarn in parallel with a ceramic flat plate having a temperature of 473 K under tension, heating for 5 seconds, and air-cooling while maintaining the tension. Moreover, the test yarns 6-8 were produced by defibrating the test yarns described in the defibration history. The primary twisted yarn is twisted to the right twist, the secondary twisted yarn is twisted to the left twist, and the test yarn of the secondary twist is twisted by arranging a plurality of heat-set primary twisted yarns, It was prepared by reheat fixing. Further, the tension at the time of heat fixing of the twisted yarn was set so that the twisted yarn did not loosen and kept at a certain length, and defibration was performed at a room temperature of about 293 K by rubbing between natural rubber sheets.

(Preparation of hydraulic cured body)
Test yarns 1 to 8 were inserted 15 mm vertically from the top surface into a cement paste (within the container and the top surface was a horizontal surface) prepared by hand kneading ordinary Portland cement and water (weight ratio 3: 1), and in an atmosphere of 100% humidity. After time-hardening, it was allowed to stand in a water tank and further cured under water for 6 days.

(Physical adhesion test between test yarn and hydraulic cured body)
Fix the cured body taken out of the water after underwater curing to the upper plate of the weigher, record the change of the weigher load display value while pulling the exposed part of the test thread vertically upward, and pull the tension (max. (Tension) was determined by a specified method. The test was conducted immediately after the cured product was taken out of the water.

[Comparative Example 1]
Table 1 shows the data.

An adhesion test between the test yarn 9 (untwisted single fiber) and the hydraulic cured body was performed. The production of the hydraulic cured body and the adhesion test were performed according to the method and conditions of Example 1.

[Example 2]
Table 1 shows the data.

(Test yarn production)
Test yarns 10-14 were prepared by heat-fixing specific twisted yarns, and test yarns 15-17 were prepared by defibrating the test yarns described in the defibration history. Twisting the twisting, heat-setting and defibration was carried out in the procedure and conditions in Example 1. The test yarns 18 and 19 are the same as the test yarns 1 and 6, respectively.

(Production of polymer cured body)
Test yarns 10 to 19 in an uncured liquid of epoxy resin (Epobond EB-42 manufactured by Aoi Chemical Industry Co., Ltd.) mixed with a base agent and a curing agent (weight ratio 4: 1) (in a glass container and the upper surface is a horizontal plane). Was inserted 15 mm vertically from the upper surface and cured.

(Physical adhesion test between test yarn and polymer cured product)
A glass container containing a cured polymer cured body is fixed to the upper plate of the weighing instrument, and the change in the weighing instrument load value is recorded while pulling the test yarn exposed part vertically upward. The test was performed in a manner that specified the tension (maximum tension).

[Comparative Example 2]
Table 1 shows the data.

The adhesion test between the test yarns 20 and 21 (untwisted single fibers) and the polymer cured body was performed. The polymer cured product was prepared and the adhesion test was performed according to the method and conditions of Example 2. The test yarn 21 is the same as the test yarn 9.

As described above, the untwisted fibers as compared to, for maximum stress (fibers and hardened body during withdrawal tests from the hydraulic cured product and polymeric cured product of the fibers shaping a helical shape by the method of Example The index of physical adhesion) increases, and the maximum stress of some fibers approaches or exceeds the average strength of the fibers.

Table 2, Example 3, showing data of the comparative example 3, Example 4, and Comparative Example 4.

(Supplementary explanation of Table 2 )
1) The shape of the test body is a plate shape having a square with a side of 100 mm and a thickness of 5 mm.
2) Test yarn 22, to twisting in twist number of 165t / m in S twist six fibers A, heat, coil-shaped filaments were produced by defibrating by the procedure and conditions in Example 1.
3) Test yarn 23, to twisting in twist number of 200t / m in S twist the six fibers B, heat, coil-shaped filaments were produced by defibrating by the procedure and conditions in Example 1.

[Example 3]
Table 2 shows the data.

(Test specimen production)
In the test bodies 1 to 3, each test yarn described in the table was uniformly dispersed by hand in a cement paste prepared by hand kneading ordinary Portland cement and water (weight ratio 3: 1), and the test body 4 was larger than ordinary Portland cement. The test paste 1 is uniformly dispersed by hand kneading into an uncured cement mortar material obtained by hand-kneading dry river sand and water (weight ratio 2: 4: 1) that have been screened to a thickness of 0.1 to 0.5 mm. The cement paste and mortar Fill the mold with uncured material, place an impervious film with a smooth upper surface, cure for 24 hours in an atmosphere of 100% humidity, remove the mold and leave it in the aquarium for another 6 days. Cured and made. The shape of the test body was a plate shape having a square with a side of 100 mm and a thickness of 5 mm.

(Impact test)
In accordance with the board impact test method (JIS A 1408), the test specimen taken out from the water after curing under water is placed horizontally on dry river sand screened to a size of 0.5 to 2.0 mm, and steel balls (high carbon chrome Steel (diameter 63.5 mm, weight 1.042 kg) was dropped from a height of 1 m to the center of the specimen, and the specimen was observed for separation, penetration, dents and cracks. The test was conducted immediately after the cured product was taken out of the water.

[Comparative Example 3]
Table 2 shows the data.

The test body 5 is a cement paste in which the test yarn 9 (untwisted single fiber) is uniformly dispersed by hand kneading, the test body 6 is a cement paste not containing reinforcing fibers, and the test body 7 is the test thread 9 (untwisted single fiber). ) Was uniformly dispersed by hand kneading, and the specimen 8 was prepared by filling a mold frame with an uncured cement mortar material containing no reinforcing fiber and curing it. Cement paste and component mixing ratio other than the test yarn Mortar uncured material and mold geometry (specimen shape) the same as in Example 3, also specimens prepared and impact tests were carried out by the method and conditions of Example 3.

[Example 4]
Table 2 shows the data.

(Test specimen production)
Specimens 9 and 10, the uncured liquid epoxy resin of Example 2, was homogeneously dispersed by stirring each test yarns 14, 23, injecting the uncured liquid into a mold was prepared by curing . The shape of the test body was a plate shape having a top and bottom surface of a square with a side of 100 mm and a thickness of 5 mm.

(Impact test)
With the test method of Example 3, the impact test of the test body from which the mold was removed was performed.

[Comparative Example 4]
Table 2 shows the data.

The test body 11 is uncured liquid test yarn 20 (untwisted filaments) dispersed homogeneously by stirring the Example 2 epoxy resin, the test body 12 is an uncured liquid without compounding reinforcing fibers, Example 4 It was poured into a mold having the same shape as that of the mold and cured. The impact test was performed according to the method and conditions of Example 4.

Compared with a cement board mixed and blended with unreinforced or untwisted fibers, the cement board reinforced by mixing and blending fibers processed by the method of this embodiment can dent in the collision part, but the steel ball collision part , Penetration of fine pieces, and separation of the peripheral part are not caused, and the widening of cracks on the collision surface is also suppressed, and excellent impact strength is exhibited. The same applies to cement mortar boards. Furthermore, although the plastic plate reinforced by mixing and blending the fibers processed by the method of the present embodiment can also dent in the collision part, separation of the test specimen and crack widening of the collision surface are completely suppressed, and excellent impact strength showed that. In addition, taking a cement mortar board as an example, the state of impact fracture of the test specimen is shown in FIG. 6 (test specimen 4) and FIG. 7 (test specimen 7).

Here, a specific example of the reference example is shown below. In this reference example, the following two types of circular cross-sectional organic fibers were used as the strands of the test yarn.
Fiber A: Material; nylon 66, average diameter; 0.235 mm, average strength; 954 MPa
Fiber B: Material; PET average diameter; 0.235 mm Average strength; 926 MPa

Table 3 shows data of Reference Example 1, Reference Comparative Example 1, Reference Example 2, and Reference Comparative Example 2.

(Supplementary explanation of Table 3 )
1) The order of a test yarn composed of one fiber is expressed as a single fiber.
2) A primary twisted yarn is produced by twisting a fiber bundle into a right twist.
3) The maximum tension is the maximum tension acting on the single fiber of the test yarn during the physical adhesion test. (Tension applied per single fiber when the test yarn is pulled out or cut)
4) The maximum stress is a value obtained by dividing the maximum tension by the single fiber cross-sectional area.
5) * indicates that the test yarn was cut outside the cured body during the test, and the numerical values required for pulling out are equal to or greater than the values shown in the table (tension and stress at the time of cutting). The difference in mechanical adhesion cannot be evaluated.

[ Reference Example 1]
Table 3 shows the data.

(Test yarn production)
The test yarn 1 was placed on a steel plate that had been left in a horizontal position by placing the twisted yarn in parallel contact with a ceramic flat plate having a temperature of 473 K under tension, heating for 5 seconds, and air-cooling while maintaining the tension. The twisted yarn was crushed while being uniformly pressed from above with a stainless steel rod, and reheat-fixed under the same method and conditions as the pre-heat fix. The crushing was performed at room temperature of about 293K (lower than the glass transition temperature of fiber A 323K), and the twisted yarn thickness was reduced from 0.42mm to 0.37mm, but the crossing part of the fibers mainly in the pressing direction was crushed. As a result, the uneven structure remained on the pressure surface of the twisted yarn. Further, the test yarn 2 was produced by defibrating the test yarn 1 at a room temperature of about 293K by a method of rubbing the test yarn 1 between natural rubber sheets.

(Preparation of hydraulic cured body)
Test yarns 1 and 2 are inserted 15 mm vertically from the top surface into a cement paste (inside the container and the top surface is a horizontal surface) in which ordinary Portland cement and water (weight ratio 3: 1) are hand-kneaded. After time-hardening, it was allowed to stand in a water tank and further cured under water for 6 days.

(Physical adhesion test between test yarn and hydraulic cured body)
Fix the cured body taken out of the water after underwater curing to the upper plate of the weigher, record the change of the weigher load display value while pulling the exposed part of the test thread vertically upward, and pull the tension (max. (Tension) was determined by a specified method. The test was conducted immediately after the cured product was taken out of the water.

[ Reference Comparative Example 1]
Table 3 shows the data.

The adhesion test of test yarn 3 (primary twisted yarn that does not undergo crush deformation), test yarn 4 (untwisted single fiber), and a hydraulic cured body was performed. The heat setting of the test yarn 3, the production of the hydraulic cured body, and the adhesion test were performed by the method and conditions of Reference Example 1.

[ Reference Example 2]
Table 3 shows the data.

(Test yarn production)
The test yarn 5 is placed on a horizontally flat ceramic plate at a temperature of 363 K (higher than the glass transition temperature 342 K of the fiber B), and the twisted yarn is uniformly crushed while pressing the twisted yarn from above with a stainless steel rod. Then, it was prepared by reheating and fixing by air cooling while maintaining the tension. Further, the test yarn 6 was produced by defibrating the test yarn 5. The thickness of the twisted yarn was reduced from 0.44 mm to 0.33 mm by the crushing, but the crossing part of the fibers mainly in the pressing direction was crushed, and the concavo-convex structure remained on the pressing surface of the twisted yarn. There was a slight gap. The heat setting and defibration of the twisted yarn before crushing were performed by the method and conditions of Reference Example 1. The test yarns 7 and 8 are the same as the test yarns 1 and 2, respectively.

(Production of polymer cured body)
Test yarns 5 to 8 in an uncured liquid (epoxy bond EB-42 made by Aoi Chemical Industry Co., Ltd.) mixed with the main agent and a curing agent (weight ratio 4: 1) (in a glass container and the upper surface is a horizontal surface). Was inserted 15 mm vertically from the upper surface and cured.

(Physical adhesion test between test yarn and polymer cured product)
A glass container containing a cured polymer cured body is fixed to the upper plate of the weighing instrument, and the change in the weighing instrument load value is recorded while pulling the test yarn exposed part vertically upward. The test was performed in a manner that specified the tension (maximum tension).

[ Reference Comparative Example 2]
Table 3 shows the data.

The adhesion test of the polymer cured body was performed with test yarns 9 (primary twisted yarn not crushing deformed), 10 (untwisted single fiber), 11 (primary twisted yarn not crushing deformed), and 12 (untwisted single fiber). . The heat fixing of the test yarn 9 was carried out by the method and conditions of Reference Example 1, and the polymer cured body preparation and the adhesion test were carried out by the method and conditions of Reference Example 2. The test yarns 11 and 12 are the same as the test yarns 3 and 4, respectively.

Thus, compared to untwisted fiber and primary twisted yarn that does not undergo crushing deformation, the maximum stress (fiber and hardening) during the pull-out test from the hydraulic and polymer cured body of the fiber crushed and deformed by the method of this reference example. The body's physical adhesion index) is greatly increased, and the maximum stress of some crushed fibers approaches or exceeds the average strength of the fibers. Moreover, even if it is a test thread | yarn of the primary twisted-yarn structure, the adhesiveness with respect to the hardened | cured material which was extremely excellent by crushing deformation is shown.

Table 4 shows data of Reference Example 3, Reference Comparative Example 3, Reference Example 4, and Reference Comparative Example 4.

(Supplementary explanation of Table 4 )
1) The shape of the test body is a plate shape having a square with a side of 100 mm and a thickness of 5 mm.

[ Reference Example 3]
Table 4 shows the data.

(Test specimen production)
Specimen 1 is a paste made of ordinary Portland cement and water (weight ratio 3: 1) by hand, and test yarn 1 is uniformly dispersed by hand and packed in a mold, and the upper surface is smoothed to form an impermeable film. Then, after curing for 24 hours in an atmosphere of 100% humidity, the mold was removed and allowed to stand in a water tank, and further cured for 6 days in water. The shape of the test body was a plate shape having a square with a side of 100 mm and a thickness of 5 mm.

(Impact test)
In accordance with the board impact test method (JIS A 1408), the test specimen taken out from the water after curing under water is placed horizontally on dry river sand screened to a size of 0.5 to 2.0 mm, and steel balls (high carbon chrome Steel (diameter 63.5 mm, weight 1.042 kg) was dropped from a height of 1 m to the center of the specimen, and the specimen was observed for separation, penetration, dents and cracks. The test was conducted immediately after the cured product was taken out of the water.

[ Reference Comparative Example 3]
Table 4 shows the data.

The test body 2 was prepared by packing a cement paste in which the test yarn 4 (untwisted single fiber) was uniformly dispersed by hand kneading, and the test body 3 was filled with a cement paste containing no reinforcing fiber and cured. The composition ratio of the cement paste other than the test yarn and the formwork shape (test body shape) were the same as in Reference Example 3, and the test body preparation and impact test were also performed according to the method and conditions of Reference Example 3.

[ Reference Example 4]
Table 4 shows the data.

(Test specimen production)
The test body 4 was prepared by injecting an uncured liquid of the epoxy resin of Reference Example 2 into a mold, and forming a square mesh sheet having the same shape as the bottom of the mold formed by arranging the test yarns 1 in a grid shape at intervals of 5 mm. The inner uncured liquid was embedded and blended at a position 2.5 mm from the bottom surface in parallel with the bottom surface and cured. The shape of the test body was a plate shape having a top and bottom surface of a square with a side of 100 mm and a thickness of 5 mm.

(Impact test)
With the method and conditions of Reference Example 3, an impact test was performed on the test specimen from which the mold was removed.

[ Reference Comparative Example 4]
Table 4 shows the data.

The test body 5 was prepared by injecting an epoxy resin uncured liquid of Reference Example 2 containing no reinforcing fiber into a mold having the same shape as that of Reference Example 4 and curing it. The impact test was performed by the method and conditions of Reference Example 4.

In this way, compared to a cement board mixed and blended with unreinforced or untwisted fibers, the cement board reinforced by mixing and blending the fiber processed by the method of this reference example can be dented in the collision part, It does not penetrate the steel ball collision part, scatters small pieces, or separates the peripheral part, and also suppresses the widening of cracks on the collision surface, and exhibits excellent impact strength. In addition, a plastic plate reinforced by embedding and meshing a mesh sheet prepared by the method of this reference example can also dent in the collision part, but the separation of the test specimen and the crack widening of the collision surface are completely suppressed, resulting in excellent impact. Indicates strength.

It is process drawing which shows an example of the manufacturing method of the reinforcement hardening body which concerns on a reference example . It is process drawing which shows an example of the manufacturing method of the reinforcement hardening body which concerns on a reference example . It is the partial side view which looked at the crushing twisted yarn uniformly crushed along the length direction, and the deformation | transformation single fiber which fibrillated the said crushing twisted yarn from the pressurization direction. It is process drawing which shows an example of the manufacturing method of the reinforcement hardening body which concerns on another reference example . It is a partial side view of the twisted yarn which illustrates the definition of the twisted yarn order. Is an explanatory view showing the state of impact fracture of the test specimen of Example (specimen 4). It is explanatory drawing which shows the mode of the impact fracture of the test body in a comparative example (test body 7).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crush twisted yarn 2 Deformed single fiber 3 Secondary twisted yarn 4 Primary twisted yarn 5 Single fiber

Claims (6)

  A specific twisted yarn made of an organic fiber having a glass transition temperature of 313 K or higher is heat-set under tension and then cut, and the cut specific twisted yarn is mixed and mixed in an uncured material of a cured body to cure the uncured material. A method for producing a reinforced hardened body.   2. The method for producing a reinforced cured body according to claim 1, wherein the specific twisted yarn is defibrated between the time when the specific twisted yarn is heat-fixed and before mixing with the uncured material.   The method for producing a reinforced hardened body according to claim 1, wherein the specific twisted yarn is defibrated simultaneously with the mixing and blending. The specific twisted yarn is a primary twisted yarn of an organic fiber having a circular cross section,
The cross-sectional area ratio of the organic fibers constituting the specific twisted yarn is in the range of 1 to 4,
The number of organic fibers constituting the specific twisted yarn is any number from 2 to 10,
The method for producing a reinforced hardened body according to any one of claims 1 to 3. The method for producing a reinforced hardened body according to claim 4, wherein the number of organic fibers constituting the specific twisted yarn is any number from 2 to 4.   A reinforced cured body produced by the method for producing a reinforced cured body according to claim 1.