JPH1036151A - Master batch of loosened synthetic fiber product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a master batch of high content of synthetic fiber which can be added to cement or in the production of a variety of concrete materials and can be uniformly dispersed in a shortened time through simple mixing operations by admixing a composition to specific synthetic fiber, fibrillating and dispersing them. SOLUTION: As a reinforcing fiber in the master batch, a variety of organic synthetic fibers are used, which develop reinforcing effect, when they are formulated to a variety of materials, for example, cement formed products for building material or coating materials for buildings and building materials and have an average fiber length of 2-15mm, a thickness of 0.1-40 denier. The synthetic fiber is mixed with a betain type ampholytic surfactant to apply the surfactant to the fiber surface thereby improving dispersion of the fiber. The amount of the surfactant is 0.05-5wt.% based on the synthetic fiber on the solid basis. The treated synthetic fiber is combined with 20-200 pts.wt. of multibranched polyolefin short-cut fibers with an average fiber length of 0.1-1.0mm, prepared by drying and fibrillating polyolefin synthetic pulp into flap-like substance per 100 pts.wt. of the synthetic fiber and with 20-300 pts.wt. of an inorganic filler with an average particle size of <=5μm and they are fibrillated and dispersed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a masterbatch of a defibrated synthetic fiber having excellent dispersibility.

[0002]

2. Description of the Related Art Conventionally, asbestos has been used as a reinforcing material in cement / concrete moldings for building materials and in coatings / fillers for construction and building materials in order to improve mechanical strength. However, in recent years, asbestos health and health
The problem of pollution harm has emerged greatly, and various synthetic fibers have been used as substitutes for reinforcing materials. Synthetic fibers having a high reinforcing effect used for such purposes include vinylon fibers, polyacrylonitrile fibers,
There are aramid fiber, carbon fiber, polyolefin fiber, cellulose fiber, etc., and these synthetic fibers are entangled with each other during use to form a so-called fiber ball. Once the fiber ball is formed, it is easily defibrated. Therefore, there is a disadvantage that the fibers are not uniformly dispersed in the product, and it is difficult to obtain a product having sufficient strength.

[0003] As a method of improving such a defect, Japanese Patent Application Laid-Open No. 58-140355 discloses a kneader comprising a composition comprising cement, an organic pressure-sensitive adhesive, vinylon fiber, asbestos, calcium metasilicate, and finely powdered hydrous calcium silicate. A method is described in which a mixture obtained by mixing with a mold mixer or the like, adding water thereto, and kneading is molded under pressure and cured. However, in this method, since the vinylon fiber is mixed with the cement and the aggregate in a kneader type mixer without adding water, the fiber may be damaged or cut, and the strength of the fiber itself may be reduced. ,
There is a problem in that sufficient strength cannot be imparted to the cured product, and in the case of mass production, energy efficiency is poor.

Japanese Patent Publication No. Sho 62-30651 discloses a method in which a water-soluble polymer and a large amount of water are added to a synthetic fiber and oscillated and defibrated, and oscillated and mixed with cement, fine aggregate and the like. A method for producing a fiber-reinforced cement molding by kneading and press-shaping is described. However, in this method, since the synthetic fibers are used as a low-concentration fibrillated aqueous mixture containing a large amount of water, there is a problem that the working efficiency is extremely poor.

[0005]

SUMMARY OF THE INVENTION The main object of the present invention is to:
During the manufacturing process of cement products and various other materials, simply add these materials and perform a simple mixing operation.
An object of the present invention is to provide a masterbatch of a synthetic fiber defibrated material that can uniformly disperse synthetic fibers in a short time and has a high synthetic fiber content.

[0006]

Means for Solving the Problems The present inventor has made intensive studies to solve the above-mentioned problems. as a result,
After treating a synthetic fiber with a specific average fiber length with a betaine-based amphoteric surfactant, a multibranched polyolefin short fiber and an inorganic filler are added, and these are mixed to defibrate and uniformly disperse the synthetic fiber. When the mixture is added to and mixed with various materials such as water, a water-based compound, and a cement-based material, the dispersibility of the synthetic fiber is very good, and the cement-based molded article, the coating material for building or building materials, etc. It has been found that the synthetic fibers can be easily and uniformly dispersed without forming a fiber ball simply by blending them at an arbitrary stage during the production of the above-mentioned various products and performing a normal mixing operation. Furthermore, this mixture has a very high working efficiency due to the high content of synthetic fibers, and is very useful as a master batch of synthetic fibers used for addition to cementitious materials and other various materials. The inventor has found that the present invention has been completed.

That is, according to the present invention, the average fiber length is 2 to 15 mm.
After treating the synthetic fiber of the above with a betaine-based surfactant, 20 to 200 parts by weight of the multibranched polyolefin short fiber and 100 to 100 parts by weight of the synthetic fiber, and 20 to 300 parts by weight of an inorganic filler having an average particle size of 5 μm or less. And a master batch of a synthetic fiber defibrated material obtained by defibrating and dispersing synthetic fibers by mixing and mixing, and a cement-based molded article for a building material obtained by compounding the master batch and a building or building material It is intended to provide an application or filler.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The synthetic fibers used in the present invention have a reinforcing effect by being blended with various materials such as cement-based molded articles for building materials and coating materials for construction and building materials. The type is not particularly limited, and various organic synthetic fibers conventionally used as a material having a reinforcing effect can be used according to the application. Examples of such synthetic fibers include fibers of vinylon, polyacrylonitrile, aramid, polyester, polyolefin, and the like. As synthetic fiber, length 2
It is appropriate to use one having a size of about 15 mm.
It is preferable to use one having a size of about mm. Usually, the thickness of the synthetic fiber is preferably about 0.1 to 40 denier, more preferably about 1 to 3 denier.

In the present invention, it is necessary to use the above-mentioned synthetic fiber after treating it with a betaine-based amphoteric surfactant. Although the treatment method is not particularly limited, it is usually sufficient to mix the synthetic fiber and the betaine-based amphoteric surfactant, whereby the betaine-based amphoteric surfactant is attached to the surface of the organic synthetic fiber, and the synthesis is performed. The dispersibility of the fibers becomes very good.

The method of mixing the synthetic fiber and the betaine-based surfactant is not particularly limited. For example, an aqueous solution of the surfactant is mixed with the synthetic fiber and left for about 1 to 10 minutes to form the synthetic fiber. A method of wetting an aqueous solution of a surfactant is preferred. After mixing the synthetic fiber and the aqueous surfactant solution, if the water content is excessive and the synthetic fiber is in a muddy or moist state, it is preferable to evaporate the water by heating or leaving it to stand naturally. Although it depends on the type of synthetic fiber, when the surfactant aqueous solution is diluted with water so as to become an aqueous solution having substantially the same weight as the synthetic fiber used, it becomes an appropriate wet state in a mixed state, In many cases, it can be used as it is in the next mixing step.

Betaine-based amphoteric surfactants are quaternary ammonium-type surfactants having a carboxyl group as an anionic moiety in the molecule. Examples thereof include lauryl dimethyl betaine and stearyl dimethyl betaine. Name: Amphitol 24B, 86B
(Both manufactured by Kao Corporation) and dispersant E86B (manufactured by Unitika).
% Aqueous solution.

The amount of the betaine-based amphoteric surfactant used is generally about 0.05 to 5% by weight (solid content ratio), preferably about 0.2 to 2.0% by weight, based on the synthetic fibers.

In the present invention, after the synthetic fiber is treated with a betaine-based surfactant by the above-described method, a multibranched polyolefin short fiber is blended with this. By blending the multi-branched polyolefin staple fiber, when defibrating the synthetic fiber, the polyolefin staple fiber itself is dispersed, and at the same time, the branch part of the polyolefin fiber has an anchor effect, so it becomes a defibration aid for the synthetic fiber. It entangles around the defibrated single fiber and acts to hinder its assembly. The multi-branched polyolefin staple fiber used in the present invention is a fluffy material obtained by drying and fibrillating a polyolefin synthetic pulp, and has a multi-branched shape having a trunk-like portion similar to a general pulp fiber and a large number of branches and leaves. The fiber length is about 0.1 to 1.0 mm, and a fiber as short as possible is suitable. In addition, the thickness of the stem-like portion is about 10 to 100 μm, and the thickness of the branches and leaves is 1 to 100 μm.
Those having a diameter of about 10 μm are suitable, and particularly, ultrafine short fibers having a small diameter are preferable. Further, it is desirable that the polyolefin short fibers are made hydrophilic by introducing a polar group. Examples of the method of making the fiber hydrophilic include a method of introducing a hydrophilic group such as a carboxyl group into the fiber, a method of treating the fiber with a hydrophilic nonionic surfactant such as polyethylene alkyl ether, and adding an aqueous solution of polyvinyl alcohol to the fiber solution during spinning. And the method of flash spinning, especially the method of treating with a nonionic surfactant is the most convenient, for example, a simple method of adding an appropriate amount of a surfactant to water-containing polyolefin fibers and mixing with a mixer Can be made sufficiently hydrophilic. Currently commercially available hyperbranched polyolefin ultrafine fibers include Chemibest FDSS-2 (average fiber length 0.6 mm) as a polyethylene type.
Chemibest FDSS-5 (average fiber length 0.1 mm), Chemibest FDSS-25 (average fiber length 0.6 mm, hydrophilized product), Chemibest FDSS-50 (average fiber length 0.1 mm).
There is a product having a trade name such as 1 mm (a hydrophilic product) (all manufactured by Mitsui Petrochemical Industries, Ltd.).

In the present invention, it is necessary to further incorporate an inorganic filler having an average particle size of 5 μm or less. By blending such an inorganic filler, the fibrillation of the synthetic fiber is facilitated during the production of the masterbatch, and the dispersibility of the synthetic fiber is improved when the masterbatch is used. As the inorganic filler, for example, silica fume, light calcium carbonate, hydrous silicic acid, natural silica, synthetic silica,
Kaolin, microtalc, precipitated barium sulfate, aluminum hydroxide, mica, diatomaceous earth and the like can be used, and silica fume is particularly preferred. These inorganic fillers can be used alone or in a suitable mixture. The average particle size of the inorganic filler is more preferably 1 μm or less. The minimum particle size of the inorganic filler is not particularly limited, but is preferably about 0.05 μm or more. The amount of the inorganic filler used is 20 to 100 parts by weight of the synthetic fiber.
The optimum amount of addition may be about 300 parts by weight, although it depends on the type and length of the fiber, but is preferably about 50 to 100 parts by weight.

The synthetic fiber defibrated masterbatch of the present invention is obtained by treating synthetic fibers with a betaine-based surfactant, blending the resulting mixture with a multi-branched polyolefin short fiber and an inorganic filler, and mixing the resulting mixture. And uniformly dispersed. The mixing method is not particularly limited as long as the synthetic fiber can be sufficiently defibrated and uniformly dispersed, and the mixed material and the treated material obtained by mixing the surfactant, the multi-branched polyolefin short fiber and the inorganic filler can be used. At once, mixing and fibrillating synthetic fibers, a single-stage processing method, and first, a mixed material of a synthetic fiber and a surfactant mixed with a multi-branched polyolefin short fiber, and then an inorganic filler is added. There is a two-stage treatment method for further mixing, and any method may be used, and it may be appropriately selected according to the type of synthetic fiber and the type and amount of components other than fiber.

In the present invention, in particular, as a mixing method, a method of mixing with a mixer equipped with a high-speed rotating blade is preferable, whereby uniform fibrillation and dispersion of synthetic fibers can be easily performed.

Mixers provided with blades rotating at high speed generally have a cylindrical drum shape, and there are a vertical type and a horizontal type. Usually, a vertical type is provided with a blade at the bottom and a horizontal type. Has a blade on the side surface, but may have any shape. Although the shape of the blade is not particularly limited, a flat blade type is generally used, and a cutter having one to four blades is usually most suitable. The blade may be a single-stage type or a multi-stage type, and names such as a cutter knife and a chopper are also used. In addition, a skipper as an auxiliary tool,
Excavators of various shapes, baffles, or the like may be added to eliminate voids or to facilitate the movement of objects to be crushed. Commercially available products of such a mixer include a cutter mixer (manufactured by Nishimura Kikai Seisakusho), an Erich mixer (manufactured by Nippon Eirich), a Reedige mixer (manufactured by Reedige) and the like. In the present invention, a sufficient dispersing effect can be obtained only by using a cutter type mixer having a simple structure without using a complicated and expensive mixer, which is economically advantageous.

Regarding the rotation speed of the blade of the mixer,
The optimum range varies depending on the model, but usually about 150 per minute.
The rotation may be in the range of 0 to 6000 rotations. Regarding the mixing time by the mixer, the total mixing time is suitably about 15 to 120 seconds, and preferably about 30 to 60 seconds in both the one-stage mixing and the two-stage mixing.
The specific mixing time may be appropriately determined by conducting preliminary experiments as needed according to the type of the mixture, the amount ratio, the type of the mixer, the capacity, the number of revolutions, and the like.

When the synthetic fibers are defibrated and reach a uniform dispersion state, the mixing operation is stopped to obtain a master batch of defibrated synthetic fibers having good dispersibility. At this time, care must be taken because excessive mixing may cause irreparable agglomeration.

Before use, the masterbatch of the present invention contains
Other components such as cellulose fiber, glass fiber, asbestos, rock wool cut material, various thickeners, antiseptic / antifungal agents, inorganic fillers, cement additives, pigments, metal powders, etc. may be added in advance. it can.

The synthetic fiber defibrated master batch of the present invention may be stored as it is and used when necessary, or may be used immediately in the next step. Further, if necessary, the water contained in the master batch can be removed before use.

[0022] The master batch of the present invention is conventionally made of asbestos,
In various products in which synthetic fibers or the like are compounded as a reinforcing material, these products can be used in place of these conventional reinforcing materials. As an object to be blended with such a master batch of the present invention, as a cement-based molded article for building materials, an outer wall,
There are interior / exterior materials such as cast-in-place concrete products such as floors, sizing boards, roof tiles, flat plates, corrugated sheets, etc., and undercoating materials and intermediate coatings as cement or resin-based coatings or fillers for construction or building materials. Materials, finishing materials, sealants, caulking materials, putties, various painted wall materials, and the like.

The masterbatch of the present invention can be added at any process stage during the production of the above-mentioned various products, and the synthetic fibers can be easily and quickly incorporated into these materials only by mixing under ordinary conditions. It can be uniformly dispersed in a defibrated state.

[0024]

The synthetic fiber defibrated material master batch of the present invention is in a state where synthetic fibers are defibrated and uniformly dispersed, and is used for producing cement-based molded articles, coatings for building and building materials, and fillers. It is possible to easily and uniformly disperse the synthetic fibers simply by blending them at an arbitrary stage and performing a normal mixing operation, thereby exhibiting an excellent reinforcing effect. In addition, despite the fact that synthetic fibers are contained at a high concentration, there is no formation of fiber balls at the time of use, handling is very easy, and work efficiency is good.

As described above, the masterbatch of the present invention can be added at any stage during the production of a cement-based molded product, a coating or a filler for construction or building materials, and is also applicable to a papermaking method and small-scale production. Since it can be easily applied, it is possible to broaden the applications of synthetic fibers, and furthermore, it contributes to the efficiency of the manufacturing process of various products.

[0026]

【Example】

Example 1 Vinylon fiber having a fiber length of 6 mm and 1.6 denier (diameter 13 μm) (vinylon fiber AA for FRC, Unitika Ltd.)
1000 g), 1000 ml of a 2% aqueous solution of an active ingredient of a betaine surfactant (trade name: dispersant E86U, manufactured by Unitika Ltd.) was added, mixed and wet for 5 minutes, and then multi-branched fiber was added. 600 g of polyethylene short fiber (trade name: Chemibest FDSS-50, manufactured by Mitsui Petrochemical Industries, Ltd., average fiber length: 0.1 mm) is added, and a cutter-type mixer (cutter mixer 25S,
Charged in Nishimura Machinery Co., Ltd., capacity 25 liters, flat blade type, with skipper), operated at 2500 rpm for 20 seconds, silica fume (average particle size 0.15 μm, trade name:
Micro silica 920, manufactured by Elchem Japan Ltd.)
An additional 1000 g was run for a further 15 seconds. After the end,
The contents of the mixer were taken out and used as a master batch of synthetic defibrated material. 18% moisture in masterbatch
And the vinylon fiber content in the solid content is 38 theoretically.
%Met. This is designated as master batch (I).

Comparative Example 1 A masterbatch containing vinylon fibers was produced in the same manner as in Example 1, except that the treatment of wetting the vinylon fibers with the aqueous solution of betaine-based surfactant was not performed. The measured value of the moisture was 0.8%. This is designated as master batch (II).

Comparative Example 2 In Example 1, except that the treatment of wetting the vinylon fibers with the aqueous solution of betaine-based surfactant was not performed, and micro silica 920 was used instead of the multibranched polyethylene short fibers. By performing the same operation as in Example 1, a master batch containing vinylon fibers was produced. The measured value of moisture was 0.7%. This is called master batch (II
I).

Test Example 1 Screw type single screw kneader (Connel mixer KM-20)
1,000 g of Portland cement, 10 g of water reducing agent (trade name: Mighty 150, manufactured by Kao Corporation), 300 g of water, and 500 g of silica sand No. 8 are put into a type 1 (manufactured by Tsutsui Rika Co., Ltd., capacity 3.6 liters). Then, three kinds of samples were prepared by kneading for 2 minutes, and the master batch (I),
After adding 40 g (in terms of solid content) of (II) or (III) and kneading for further 2 minutes, the mixture was pressed in a mold. As a result of observing the state of the admixture before and after molding visually and by the feel of a finger,
When the masterbatch (I) was used, no uniform lump of fibers was observed, but the masterbatches (II) and (II)
When I) was used, a large number of fiber clumps were observed.

The flexural strength of the cured product after 4 weeks was measured for each of these samples. The results are shown in Table 1 below.

[0031]

[Table 1]

As is apparent from the above results, the cured product obtained by using the master batch (I) had a very high bending strength.

Claims (5)

[Claims] After treating a synthetic fiber having an average fiber length of 2 to 15 mm with a betaine-based surfactant, 20 to 200 parts by weight of a multibranched polyolefin short fiber and 20 to 300 parts by weight based on 100 parts by weight of a synthetic fiber. A masterbatch of a defibrated synthetic fiber obtained by blending, mixing, and defibrating and dispersing synthetic fibers by weight of an inorganic filler having an average particle diameter of 5 μm or less. 2. The multi-branched polyolefin short fiber has an average fiber length of 0.1 to 1.0 mm and a trunk-like portion having a thickness of 10 to 10.
The masterbatch of the defibrated synthetic fiber according to claim 1, wherein the masterbatch is a multibranched polyethylene short fiber having a thickness of 1 to 10 µm and a branch and leaf portion of 1 to 10 µm. 3. The method according to claim 1, wherein the method of defibrating and dispersing the synthetic fibers is a method of mixing for 15 to 120 seconds with a mixer equipped with a blade rotating at a speed of 1500 to 6000 rpm. Master batch of defibrated synthetic fibers. 4. A cement-based molded product for a building material obtained by blending the master batch according to any one of claims 1 to 3. 5. A coating or filling material for building or building material obtained by blending the master batch according to claim 1.