JPH0517181B2 - - Google Patents

Description

Detailed Description of the Invention Object of the Invention The present invention relates to a method for preparing a reinforcing fiber material with good dispersibility, and a method for preparing a reinforcing fiber material with good dispersibility. The purpose of this invention is to provide a method for easily obtaining a product with improved dispersibility, to facilitate the dispersion and addition operation, and to form an efficient distribution state of the fibers in a target kneaded material, etc. .

[Industrial application field]

Improving cargo handling and dispersibility of reinforcing fiber materials added to mixed materials such as concrete.

[Conventional technology]

BACKGROUND ART It has been conventional practice to mix fiber materials into kneaded materials such as concrete for reinforcement purposes. That is, when obtaining a kneaded material in a mixer, the fiber material is added and kneaded together with other compounds to form a fiber mixture.

[Problem that the invention seeks to solve]

However, when adding and kneading the above-mentioned fibrous materials, the added fibrous materials get entangled and cannot be properly dispersed. A kneading operation that lasts a considerable amount of time is required, and of course there are limitations in terms of the amount of fiber material mixed in, the fiber length, etc., and it is not always possible to obtain a uniformly dispersed state. Therefore, even if a predetermined amount of fiber material is added, the strength of the molded product obtained by the kneaded product is determined at the weakest part, so it is possible to avoid disadvantages such as obtaining only a relatively low reinforcing effect. I don't get it.

"Structure of the Invention" [Means for Solving the Problems] The present invention was created through detailed practical studies to solve the problems of the conventional products as described above. Reinforcement with good dispersibility characterized by adding and stirring a fibrous material with a thickener into a liquid containing a thickener to disperse it, and removing the liquid from the three-dimensional dispersed state to form a two-dimensional array of the dispersion. This is a method for preparing fiber materials for use in industrial applications.

[Effect]

By adding a fibrous material in a state where it can be appropriately dispersed together with a concrete compound such as cement, sand, gravel, etc., adding water, and kneading, it can be easily dispersed in the mixture.
Fiber aggregates that are intertwined in three dimensions are difficult to disperse as they are even when kneaded considerably, but they can be easily dispersed by dispersing them in a liquid containing an appropriate thickener. By removing liquid from such a three-dimensional dispersed state, the liquid is removed from the dispersed state to create a two-dimensional array state, that is, at least the three-dimensional intersection of the raw materials is transformed into a two-dimensional horizontal array state. The apparent volume of the two-dimensionally arranged fibers can be significantly reduced compared to those in a three-dimensionally intertwined state. Even if it is a liquid, it returns to a three-dimensional dispersion state in the liquid when liquid is added, and this state is different from that simply formed in air during fiber manufacturing, and the above-mentioned When added to a kneaded material like this, it easily returns to its original state and disperses in the presence of a liquid, resulting in a uniform distribution. The apparent bulk of the two-dimensionally arranged fibers as described above is approximately specified, and therefore, the weight or capacity can be represented by the thickness. In other words, if it is a three-dimensional intersection, it will be extremely bulky,
Also, the apparent volume (thickness) is determined by the conditions of three-dimensional intersection.
On the other hand, the apparent volume of fibers arranged two-dimensionally and horizontally as described above hardly changes any further (for example, if the fibers are arranged in the same direction, Even if a dimensional array is used to further reduce the size, it would require an enormous amount of effort and is almost impossible), so the thickness can be used to sufficiently represent the weight or capacity.

〔Example〕

To further explain the present invention as described above, the fiber material may be any material as long as it gives a reinforcing effect to the kneaded and adjusted molded product, such as synthetic fibers with a fiber diameter of about 0.1 to 0.01 mm, There are alumina fibers, carbon fibers, etc. In addition, fibrous magnesium silicate, water-absorbing resin, MC, etc. can be used as the thickener, and these materials can be dissolved and dispersed in a liquid such as water to form a solution and dispersion of about 0.1 to 5%. The fiber agent is soaked in the material and dispersed using a mixer, etc. For example, 0.3 to 1 part by weight of a thickener is added to and dissolved in 100 parts by weight of water, and about 2 to 5 parts by weight of the fibrous material is immersed and stirred to be sufficiently dispersed. Even if the soaked fiber material is in the form of an entangled agglomerate, the above amount of fiber material is added to the liquid volume, generally 1 to 5.
It can be easily dispersed by stirring for minutes. By removing the liquid from the fibrous material dispersed in the liquid in this dispersed state, the three-dimensional interlacing and entanglement is resolved and a two-dimensional array is formed in the horizontal direction. In the case of carbon fiber, which is a typical reinforcing fiber, its volume is considerably reduced compared to that of raw materials that are three-dimensionally interlaced. The product can be packaged in a compact manner with approximately one-fourth of the fiber volume. The liquid removal may be carried out by any method such as discharging the dispersion liquid from the bottom of the container used for stirring and dispersing, or discharging the dispersion liquid so that the fibers remain on a sieve.

The product obtained as described above can be added and kneaded with other ingredients when preparing concrete, mortar, etc., so that it is evenly distributed in the kneaded material, and products molded with this material have favorable reinforcing properties. Close. Since carbon fibers and other materials that have been dehydrated and sufficiently dried do not contain moisture, they can be added to and reinforced with synthetic resins, and of course, they can also be applied to asphalt. In any case, the limits on the fiber length and the amount to be mixed are relaxed, the kneading operation is easy, and a uniformly dispersed state can be achieved by kneading for a short time.

Specific manufacturing examples and usage examples of the product according to the present invention will be described below.

3 parts by weight of carbon fibers with a diameter of 0.015 to 0.03 mm and a length of 5 to 20 mm are dissolved in a solution in which 0.5 parts by weight of fibrous magnesium silicate as a thickener is added to 100 parts by weight of water. The fibers were once dispersed in the liquid by stirring with a mixer, and then the dispersion was poured onto a screen to remove the liquid, and the fibers were collectively collected in a two-dimensional array along the surface of the screen. The material was further dried in its two-dimensional state to produce a product. The apparent volume of this material was 10.5/Kg compared to 43/Kg of raw carbon fiber.

However, the fiber material of the present invention obtained as described above was mixed with a cement-sand ratio of 1:2 and a water-cement ratio of 50%.
It was added in an amount of 0.5 vol.% to the prepared mortar kneaded material, and a raw mortar was obtained by dispersing and adding it using mortar kneading adjustment. That is, the green mortar kneading time was 1 minute, and the bending strength of the molded mortar product made from the kneaded product thus obtained was 72.4 after 28 days.
It was of Kg/ ^cm2 .

On the other hand, as a comparative example for the present invention, the same amount of green mortar with the same composition as above, i.e.
Carbon fibers intertwined three-dimensionally in a state of 43/Kg
The bending strength after 25 days of a molded product made from a raw kneaded material added with 2.1 vol.% and kneaded for 15 minutes (15 times the kneading time according to the present invention) was 61.5 Kg/cm ²
It was confirmed that even though the same amount of reinforcing fibers were added, the strength was about 15% lower.

"Effects of the Invention" According to the present invention as explained above, the reinforcing fiber material can be easily and uniformly dispersed and added to the kneaded material, thereby rationally increasing the strength of the product molded from the kneaded material. Furthermore, even if a thickener is used for dispersion, it is generally prepared in a dry state by deliquifying it, so that the thickener-containing liquid is used repeatedly, which especially reduces the consumption of the thickener. Furthermore, there is no need for special adjustment operations when preparing the kneaded material, and it can be handled and kneaded in the same way as ordinary fiber materials, so there is no need for a special mixer or the like, and it can be mixed by hand. This invention has advantages such as being able to be easily adjusted by means of various methods, and is a highly effective invention industrially.

The fibrous material, which has been dehydrated and has a two-dimensional orientation, has a compact packaging and is easy to handle, and the amount to be added can be easily and accurately determined.

Claims (1)

[Claims] 1. If the dispersibility is good, the fibrous material with reinforcing performance is added to a thickener-containing liquid and dispersed by stirring, and then the liquid is removed from the three-dimensional dispersion state to form a two-dimensional array state of the dispersion. Adjustment method for tightened reinforcing fiber materials.