JP2002274903A - Reinforcing fiber for plastering material, plastering material and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence or expansion of crazes after plastering. SOLUTION: The reinforcing fiber for the plastering material consisting of a polyamide fiber having single yarn fineness of 4 to 50 dtex, a fiber length of 3 to 50 mm, elongation of at least 15% and tenacity of at least over 3 cN/ dtext is added into the plastering material in such a manner that the fiber is incorporated at 0.03 to 3.0 wt.% into the binder of the material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastering material for reinforcing a paste, a mortar, or a concrete-like cured product made of a hydraulic and / or air-hardening binder used for plastering work, and a plasterer containing the reinforcing fiber. Materials and plastering methods. For details, concrete fibers, plastering materials containing reinforcing fibers, plastering materials including reinforcing fibers, and plastering methods are described. There are plastering materials used for building parts such as floors, walls, ceilings, etc. of interior and exterior that are finished with trowel coating, roller hanging and spraying, plastering materials used for sticking tiles, stone upholstery, etc., and their construction methods, and The present invention relates to a reinforcing fiber for plastering material to be mixed.

[0002]

2. Description of the Related Art A cured product of a hydraulic and air-hardening binder, such as mortar and plaster, which has been widely used as a plastering material, is inexpensive in addition to excellent properties such as compressive strength, durability and nonflammability. It is widely used in the fields of architecture and civil engineering. On the other hand, since it is a brittle substance, it has extremely low flex resistance, and has drawbacks such as being easily broken or cracked when subjected to stresses such as tension and bending, and having poor impact resistance. Therefore, a method of adding a fibrous substance has been attempted to compensate for such a defect. A typical example is reinforcement with steel fibers. However, steel fibers have a large specific gravity and are heavy as plastering materials, and workability is poor. In addition, steel fiber easily projects on the plastering surface, making surface finishing difficult,
It will also be negative from the aspect of safety. Further, the steel fiber has the drawback that the appearance deteriorates due to rusting of the steel fiber on the construction surface with time, and the reinforcing performance decreases.

Attempts have also been made to blend short fibers of a polyolefin or polyvinyl chloride type as a reinforcing material, but these fibers have a low affinity with the matrix and are inferior in adhesive strength, so that a sufficient reinforcing effect can be obtained. Did not. In addition, a vinylon fiber having a high affinity for the matrix and excellent adhesive strength is used, but is not necessarily optimal as a reinforcing fiber for plastering materials due to poor toughness. Further, glass fibers are inferior in alkali resistance, carbon fibers have a problem in adhesion to plastering materials, and glass fibers and carbon fibers are inferior in toughness. Therefore, they are not always optimal as reinforcing fibers for plastering materials.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a plasterer which has good dispersion in plastering materials, prevents cracks or the spread of cracks after plastering work, and has high reinforcing effect and excellent bending resistance. It was completed as a result of research on the provision of reinforcing fibers for materials, plastering materials and plastering methods.

[0005]

In order to solve the above-mentioned problems, the present invention has a single fiber fineness of 4 to 50 dtex, a fiber length of 3 to 50 mm, an elongation of at least 15%, and a strength of 3 cN.
The present invention provides a reinforcing fiber for plastering material, characterized by comprising a polyamide fiber exceeding / dtex. Preferably, there is provided a reinforcing fiber for plastering material, comprising a polyamide fiber having a single fiber fineness of 5 to 30 dtex, a fiber length of 5 to 40 mm, an elongation of at least 20%, and a strength exceeding 5.5 cN / dtex. I do.

The reinforcing fibers for plastering materials are preferably used by mixing two or more types of fibers having different finenesses, or by mixing and using two or more types of reinforcing fibers for plastering materials having different fiber lengths. Good. Further, the reinforcing fiber for plaster material can be used more effectively by attaching at least one selected from the group consisting of a shrinkage reducing agent, an AE agent, a swelling agent and a lower alcohol. The reinforcing fiber for plastering material can be used by being premixed with the plastering material before kneading.

Further, according to the present invention, the reinforcing fiber for plastering material is added to the binder in the plastering material in an amount of 0.03 to 3.0 wt.
The present invention provides a plastering method comprising premixing a plaster material before mixing with water at a ratio of 0.1% and then mixing with water or mixing with a mixture of plaster material and water.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. In the present invention, the fiber strength is JI
It is a value measured according to the method described in SL1070.

As the reinforcing fiber for plastering material of the present invention, a polyamide fiber made of polyamide or mainly containing polyamide is used. Among them, a so-called nylon fiber is preferably used. Examples of nylon include nylon 6, nylon 66, highly shrinkable copolymerized nylon, and flexible copolymerized nylon.

The single fiber fineness of the reinforcing fibers used is generally in the range of 4 to 50 dtex, but is preferably 5 to 30 dte.
The range of x is preferred, and those of 8 to 25 dtex are particularly preferred. If the fiber diameter is less than 4 dtex, the fineness is too small, the dispersion in the plaster material becomes uneven, and a fiber ball is produced, which tends to cause problems in workability and reinforcement strength. On the other hand, if it exceeds 50 dtex, the bonding area between the fiber and the matrix decreases, and the reinforcing effect cannot be sufficiently exhibited. Also, when using plaster or the like for the matrix,
When the rigidity is increased, the reinforcing fibers protrude from the surface even if they are held down with a trowel during construction, which is not preferable in appearance. Fiber length is usually 3 ~
The one having a diameter of about 50 mm is used, preferably 5 to 40 mm.
mm, more preferably 10 to 25 mm. If it is less than 3 mm, the surface connection reinforcement of the plastering material is poor, and if it exceeds 50 mm, the dispersibility tends to be poor.

The reinforcing fiber for plastering material of the present invention has an elongation of at least 15%, preferably at least 20%, and a strength of at least 3 cN / dtex, preferably 5.5 cN / dt.
Use more than ex. Reinforcing fibers whose elongation does not reach 15% cannot provide sufficient ductility and toughness even when mixed with the plastering material for interior / exterior use, and the effect of preventing cracks and preventing the progress of cracks becomes insufficient. Also,
If the strength is not more than 3 cN / dtex, the effect of improving bending and tensile strength as a reinforcing fiber for plastering material cannot be obtained. If the elongation exceeds 50%, the effect of preventing the growth of cracks tends to be weakened. Therefore, the elongation is more preferably in the range of 15% to less than 50%, and further preferably in the range of 20% to less than 40%.

The cross-sectional shape of the polyamide fiber used for the reinforcing fiber for plastering material of the present invention is not limited to a circle, and a so-called irregular cross-section yarn such as a triangle, an ellipse, a Y-shape, and a hollow shape can be preferably used depending on the purpose. .

Further, the reinforcing fiber for plastering material of the present invention comprises:
What is called a denier mix, that is, the single yarn fineness is 4 to 5
Between 0 dtex, two or more types of reinforcing fibers for plastering material of the present invention having different fineness can be mixed and used. By using the reinforcing fibers of the present invention having different fineness, there is an advantage that dispersibility in a matrix is improved. The fineness of the reinforcing fiber to be mixed is 1.5 to 4 in fineness ratio.
A double range is preferred.

Further, two or more kinds of reinforcing fibers for plastering materials of the present invention having different lengths may be mixed and used. That is, preferably, two or more types of reinforcing fibers for plastering materials having different fiber lengths in the range of 3 to 50 mm are mixed, or those having a length distributed in the range of 3 to 50 mm are preferably used. can do. By using reinforcing fibers of different lengths, the dispersibility in the matrix can be improved. The ratio of the lengths of the reinforcing fibers to be mixed is preferably in the range of 1.5 to 4 times.

[0015] The reinforcing fiber for plastering material can be mixed with an additive for a hydraulic and / or air-hardening binder such as mortar or a reinforcing fiber surface modifier to reduce the effect of the reinforcing fiber and the effect of the additive. It can be improved synergistically.

These additives are preferably previously attached to the reinforcing fibers used. In particular, reinforcing fibers to which at least one selected from the group consisting of a shrinkage reducing agent, an AE agent, a swelling agent, and a lower alcohol necessary for mortar preparation are adhered, these additives are weighed one by one at a construction site or the like. It is very effective for labor saving and quick construction because the time required for compounding can be saved. An additive that is not included in the above additives may be attached. Adhesion of the additive may be applied at the stage of producing filaments and staples, for example, at the time of oiling, or by spraying a solution containing the additive on the produced reinforcing fiber, or dipping in a solution containing the additive and drying. A known method can be appropriately selected and performed in consideration of the properties of the additive.

Further, in the present invention, waste thread, waste cotton, clothing waste, and the like discharged from the production and processing steps of the polyamide fiber may be appropriately separated, collected, and recycled. A fiber whose surface is treated with a surfactant or the like has a feature of being excellent in dispersibility in plastering materials.

The plastering material reinforcing fibers described above can be premixed with the plastering material before kneading and used easily.

The reinforcing fiber for plastering material of the present invention is used by mixing an appropriate amount with plastering materials such as cement mortar, lime mortar, plaster, plaster plaster, earth wall material, concrete and the like. The mixing amount varies depending on the purpose of use, but usually,
The reinforcing fibers may be blended in the plastering material such that the ratio of the reinforcing fibers to the binder such as cement contained in the plastering material is 0.03 to 3.0 wt%, preferably 0.1 to 2.0 wt%. . If it is less than 0.03 wt%, the effect of preventing cracking and strength reinforcement is not sufficient, and if it exceeds 3.0 wt%, the dispersibility in the matrix is deteriorated, so that the reinforcing effect is reduced and the construction tends to be complicated.

Since the reinforcing fiber for plastering material of the present invention contains polyamide as a raw material, it has alkali resistance, maintains its properties semi-permanently in products made of plastering material, improves the strength of the product and prevents cracking. And the development of cracks can be prevented. Plastering materials such as cement mortar, lime mortar, plaster, plaster plaster, earth wall material, concrete, etc. are used for interior and exterior floors, walls, ceilings, etc., which are finished by troweling, roller hanging, spraying, etc. And so on.

In the construction using the reinforcing fiber for plastering material of the present invention, the reinforcing fiber may be arbitrarily mixed as a raw material at any stage. Generally, a reinforcing fiber is added to a mixture of water and a plastering material composed of a hydraulic and / or air-hardening binder, followed by kneading. Alternatively, a reinforcing fiber-containing plastering material obtained by premixing a hydraulically and / or air-hardening plastering material with plastering material reinforcing fibers, adding water and kneading the mixture is sprayed using a pumping device or the like,
Or paint with a trowel or roller. In the on-site preparation, sand, reinforcing fiber and more water than the conventional case (approximately 2/3 of the required amount of water) are added, pre-mixed, stirred, and then mixed with cement and the remaining water and sand. And stirring. Even if the reinforcing fiber has a fiber length of more than 30 mm, the fiber is well dispersed without producing a fiber ball, thereby improving the strength of the product and the effect of preventing cracking.

[0022]

EXAMPLES The effects of the present invention will be described with reference to examples. In the evaluation of the following Examples and Comparative Examples, the bending strength of the fiber-reinforced mortar was determined by measuring the maximum bending strength (maximum stress), the breaking strength (stress at bending failure), and the toughness (toughness).

Examples 1 to 6 Single yarn fineness is 4.3 dtex and strength is 9.5 cN / dte.
x, a nylon 66 multifilament having a circular cross section having an elongation of 29% was converged to 1.2 million D, and was cut using a cutting machine at 5 mm, 10 mm, 15 mm and 2 mm, respectively.
It was cut to 5 mm to obtain a reinforcing fiber for plastering material. When the obtained reinforcing fiber for plastering material was mixed with mortar under the conditions shown in Table 1, it was well dispersed. After mixing, the mixture was cured to prepare a mortar sample for evaluating physical properties, and the test results were evaluated. Table 1 shows the test results.

Examples 7 to 9 Single yarn fineness is 6.6 dtex and strength is 10.5 cN / dt
ex, elongation was 26%, except that nylon 66 multifilament having a circular cross section was used.
In the same manner as in 6, a plastering material reinforcing fiber was obtained. When the obtained reinforcing fiber for plastering material was mixed in a mortar under the conditions shown in Table 1, it was well dispersed. After mixing, the mixture was cured to prepare a mortar sample for evaluating physical properties, and the test results were evaluated. Table 1 shows the test results.

Examples 10 to 15 Single fiber fineness is 21.2 dtex and strength is 6.8 cN / dt.
ex, nylon 66 with 35% elongation and Y-shaped cross section
Example 1 except that a multifilament was used.
6 to obtain plastering material reinforcing fibers. When the obtained reinforcing fiber for plastering material was mixed with mortar under the conditions shown in Table 1, it was well dispersed. After mixing, the mixture was cured to prepare a mortar sample for evaluating physical properties, and the test results were evaluated. Table 1 shows the test results.

Comparative Example 1 A mortar sample for evaluating physical properties was prepared in the same manner as in the above example, but without mixing the reinforcing fiber for plastering material, and the test results were evaluated. Table 1 shows the test results.

Comparative Example 2 Reinforcing fibers for plastering material were obtained in the same manner as in Example 2, and a mortar sample for evaluating physical properties was prepared. However, when the obtained reinforcing fiber for plastering material was mixed in the mortar so that the reinforcing fiber / binder ratio was 4 wt%, it was difficult to disperse and it took time to mix uniformly. After mixing, a mortar sample for evaluating physical properties was prepared, and the test results were evaluated. Table 1 shows the test results.

[0028]

[Table 1]

Comparative Example 3 In the same manner as in Example 1, the stock fiber length was cut to 1 mm to obtain a reinforcing fiber for plastering material. A mortar sample for evaluating physical properties was prepared from the obtained plastering material reinforcing fiber in the same manner as in Example 1. However, the prepared sample had poor surface connection reinforcement.

Comparative Example 4 In the same manner as in Example 1, the length of the stock fiber was cut to 40 mm to obtain a reinforcing fiber for plastering material. A mortar sample for evaluating physical properties was prepared from the obtained reinforcing fiber for plastering material in the same manner as in Example 1. However, fiber balls were generated due to poor dispersibility, and only the prepared sample having low bending strength was used. Could not be obtained.

Comparative Example 5 A nylon 66 reinforcing fiber for plastering material having a single fiber fineness of 4.3 dtex, a fiber length of 10 mm, a strength of 8.8 cN / dtex, an elongation of 12% and a circular cross section was produced. Reinforced fiber for plastering material produced is 1% by weight of reinforcing fiber / binder
Was mixed in a mortar and cured to prepare a mortar sample for evaluating physical properties and evaluated. However, sufficient toughness could not be obtained.

COMPARATIVE EXAMPLE 6 A reinforcing fiber for plastering material of nylon 66 having a single fiber fineness of 4.3 dtex, a fiber length of 10 mm, a strength of 2.5 cN / dtex, an elongation of 26% and a circular cross section was produced. Reinforced fiber for plastering material produced is 1% by weight of reinforcing fiber / binder
Was mixed in a mortar and cured to prepare a mortar sample for evaluating physical properties and evaluated. However, sufficient bending strength could not be obtained.

Example 16 and Comparative Example 7 In Example 16, a reinforcing fiber for plastering material was obtained in the same manner as in Example 2. A cement mortar in which the obtained reinforcing fiber for plastering material was mixed in the mortar so that the reinforcing fiber / binder ratio was 0.1 wt% was applied to the floor.

In Comparative Example 7, cement mortar was applied to the floor in the same manner as in Example 16 without mixing the plastering material reinforcing fiber. Six months later, as a result of observing the constructed floor surface, it was confirmed that the fiber-mixed floor had less cracks than the mortar floor not mixed with plastering material reinforcing fibers, and the crack preventing effect was confirmed.

Example 17 In Example 17, in the same manner as in Example 2, a high-performance AE water reducing agent (Mighty 3000S: manufactured by Kao Corporation) was added to the reinforcing fibers for plastering material at a ratio of 0.25% by weight to cement. To make it adhere to the reinforcing fiber. A cement mortar in which the obtained reinforcing fiber for plastering material was mixed in the mortar so that the reinforcing fiber / binder ratio was 0.1 wt% was applied to the floor. Six months later, the surface of the constructed floor was observed, and as a result, the floor containing fibers was hardly cracked as compared with the mortar floor not containing the reinforcing fiber for plastering material, and the effect of preventing cracking was confirmed.

[0036]

The plastering material reinforcing fiber of the present invention is a polyamide fiber made of a hydrophilic material, and generally has an adhesive property to various plastering materials and a lower level in the plastering material than other reinforcing fibers. Since the dispersibility is good and the elongation of the fiber is large, if it is constructed using plastering material mixed with this, it is difficult for cracks to occur after construction, even if it occurs, it is difficult to expand and spread It has excellent effects such as.

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // C04B 111: 20 C04B 111: 20 111: 72 111: 72 (71) Applicant 501017774 Joint-stock company Aston Enterprise Toshima-ku, Tokyo Nishiikebukuro 3-chome 25-2 (72) Inventor Rentaro Namba 4- 9-5 Itabashi, Itabashi-ku, Tokyo Namba Building Research Laboratory (72) Inventor Joe Yone 1-1-1 Oe, Otsu City, Shiga Prefecture (Tokyo) Seta Factory (72) Inventor Eizo Goto 1-11-1 Oe, Otsu-shi, Shiga Prefecture In-Seta Factory (72) Inventor Takahiro Okubo 1-6-20 Dojima, Kita-ku, Osaka, Osaka No. Toray Co., Ltd. Osaka Works (72) Inventor Yasushi Shiraishi 3-25-2 Nishiikebukuro, Toshima-ku, Tokyo Joint venture company Aston Enterprise F-term (reference) 4G012 PA24 PB15 PC01 PC02 PC09 PC11 PC14 PE04

Claims (7)

[Claims] 1. A single yarn fineness of 4 to 50 dtex and a fiber length of 3
~ 50mm, elongation at least 15%, strength 3cN /
A reinforcing fiber for plastering material, comprising a polyamide fiber exceeding dtex. 2. A single fiber fineness of 5 to 30 dtex and a fiber length of 5
~ 40mm, elongation at least 20%, strength 5.5c
A reinforcing fiber for plastering material, characterized by comprising a polyamide fiber exceeding N / dtex. 3. A plastering material reinforcing fiber comprising a mixture of two or more types of plastering material reinforcing fibers according to claim 1 or 2 having different finenesses. 4. The method according to claim 1, wherein two or more kinds of fibers have different fiber lengths.
Or a plastering material reinforcing fiber, wherein the plastering material reinforcing fiber according to 3 is mixed. 5. The plastering material according to claim 1, wherein at least one selected from a shrinkage reducing agent, an AE agent, a swelling agent and a lower alcohol is adhered. Reinforcing fiber. 6. A plastering material characterized in that the plastering material before curing is mixed with the reinforcing fiber for plastering material according to any one of claims 1 to 5. 7. The plastering material reinforcing fiber according to any one of claims 1 to 5, wherein the reinforcing fiber for the plastering material is 0.03 to 3.0.
A plastering method comprising premixing water with a plaster material before mixing at a ratio of 0 wt% and then mixing with water or mixing with a mixture of plaster material and water and performing the plastering.