JPS5951627B2 - Surface treatment method for inorganic fibers - Google Patents

Description

Detailed Description of the Invention The present invention involves mixing an adsorbent in which an organic metal surface treatment agent is adsorbed onto inorganic fibers and an adsorption material in which water is adsorbed, and then heating the mixture to vaporize the organic metal surface treatment agent and water. The present invention relates to a surface treatment method for inorganic fibers, which is characterized by forming an organic metal compound film on the surface of inorganic fibers by bringing the vaporized organic metal surface treatment agent into contact with water vapor. It is an object of the present invention to provide a method for surface treatment of inorganic fibers that can obtain high-strength inorganic fibers with little chemical deterioration.

Immediately after spinning, inorganic fibers have a very high tensile strength (200
~300kg/m4), but they are easily damaged during handling.Therefore, various surface treatment methods have been considered to prevent mechanical or chemical damage to the surface of inorganic fibers, including glass wool, rock wool, etc. A surface treatment method capable of forming a uniform film on the surface of inorganic short fibers has not yet been developed, and the strength of the inorganic short fibers becomes extremely low.

The present invention solves these drawbacks and will be described in detail below.

Inorganic short fibers such as glass wool and rock wool are usually 1
Mineral raw materials melted at a high temperature of 300 to 1500 degrees Celsius are introduced onto a disk rotating at high speed, and the centrifugal force is used to turn them into fibers from around the disk, or the molten raw materials are flowed out of a nozzle and the molten material is blown out with a high-speed air stream or flame. The fibers are blown into fibers and transported by a transport air stream to a collection box, then collected and conveyed on a conveyor.

In the surface treatment method of the present invention, for example, short fibers that are loosely accumulated on this conveyor and being transported are mixed with an adsorbent in which a surface treatment agent is adsorbed and an adsorbent in which water is adsorbed, and then the surface treatment is carried out. 100-350 when led to the tank
This is done by heating to ℃.

Examples of surface treatment agents include organic titanium compounds represented by Ti(OR)4 (where R represents an alkyl group such as C4H9, C3H7, C2H5, etc.) and Zr(OR)4 [wherein R represents an alkyl group such as C4H9, C3H7, C2H5, etc.]. Organometallic compounds such as organic zircon compounds represented by [indicating an alkyl group] are used.

Further, as the surface treatment agent or water adsorbent, there are used, for example, fuller's earth, activated clay, bauxite, charcoal, activated carbon, bone charcoal, molecular sieve, silica gel, bentonite, magnesia, activated alumina, and inorganic balloons (for example, Shirasu balloon).

The heating temperature varies depending on the type of surface treatment agent, but is generally 100 to 350℃, and should be at least 100℃ as long as it can evaporate water and the surface treatment agent. Heat losses are high and can have an undesirable effect on the treated fibers.

Although the adsorbent can be separated from the surface-treated fibers and reused, it is also possible to use the adsorbent mixed with the fibers.

Therefore, in the present invention, when the adsorbent in which the surface treatment agent is adsorbed to inorganic short fibers and the adsorbent in which water is adsorbed are mixed and immediately heated to 100 to 350°C, the surface treatment agent and water are vaporized and adsorbed. The surface treatment agent vapor and water vapor that are vaporized as they are desorbed from the material come into contact near the short fibers, and the surface treatment agent is hydrolyzed and condensed by the water vapor, forming an amorphous organometallic compound film uniformly over the entire surface of the short fibers. Form.

Since the surface treatment is a vapor phase treatment, the surface treatment agent vapor and water vapor can sufficiently diffuse and penetrate into the voids between the short fibers, forming a uniform coating on the entire fiber surface. Since it is adsorbed by the adsorbent, it is vaporized very close to the fibers and supplied to the fibers, so it can be processed extremely efficiently.

The organometallic compound used as a surface treatment agent is extremely sensitive to moisture and immediately undergoes hydrolysis when it comes into contact with moisture, so it is technically difficult to transport the surface treatment agent in a gaseous state to the treatment equipment. However, even if it is not impossible, the transportation efficiency will be reduced, and if the surface treatment agent is transported alone in a liquid phase and used, special transportation equipment or vaporization equipment will be required, which will increase the cost. When adsorbed onto an adsorbent, transportation and handling are extremely easy, and special equipment for vaporization is not required.

The fibers obtained according to the present invention can be preferably used as fillers, sound absorbing materials, heat insulating materials, and the like.

In the above description, the surface treatment of inorganic short fibers was mainly described, but the present invention is of course applicable to inorganic long fibers.

In the present invention, since an adsorbent in which an organic metal surface treatment agent is adsorbed and an adsorbent in which water is adsorbed are mixed with inorganic fibers, the surface treatment agent and water can be vaporized very close to the inorganic fibers. It can perform extremely efficient surface treatment, can be easily transported to surface treatment equipment, is extremely easy to handle, can be processed at low cost, and can be heated to produce organometallic surface treatment agents and water. At the same time, the vaporized organic metal surface treatment agent is brought into contact with water vapor to form an organic metal compound film on the inorganic fibers, so the vaporized surface treatment agent and water vapor are uniformly diffused into the voids between the inorganic fibers, covering the entire fiber surface. It is possible to form a uniform organometallic compound film and to obtain fibers with high tensile strength.

The present invention will be specifically explained below using Examples.

All percentages are by weight.

<Production of inorganic short fibers> Materials having the following composition were melted, and a cotton-making disk with a diameter of 200 mm was rotated at 300 rpm to form fibers by centrifugal force to obtain inorganic short fibers (wool) at Q, 2 t/hr.

Material composition 5iOz CaOA40s Mg040%
40% 15% 5% <Example 1> Activated carbon powder was immersed in tetrabutoxytitanium [Ti(OC4H9)4] and immediately filtered to obtain tetrabutoxytitanium-adsorbing activated carbon at a ratio of 2% to the weight of wool. % and water-absorbing shirasu balloons obtained by immersing the shirasu balloons in water for 1 hour, in an amount of 5% based on the weight of the wool, were sprinkled and mixed on the wool.

Thereafter, it was kept in a surface treatment tank at 200° C. for 2 minutes to complete the treatment.

The fiber diameter of the wool was 9 to 15 μm, and the average film thickness of the amorphous titanium compound on the fiber surface was 200 μm.

The results of measuring the tensile strength of the wool subjected to the above treatment and the untreated wool were as follows.

Untreated wool 105kg/i4
Treated wool 183kg/m4
Tensile strength measurement conditions: Wool length 10mm Tensile speed 5mm/minm
/m Number of uses: 40 each When using this treated wool, there was no need to separate and remove the adsorbent.

<Example 2> Tetrabutoxyzircon adsorbed clay obtained by immersing activated clay powder in tetrabutoxyzircon [Zr(OC4H9)4] and immediately filtering it was mixed with 1.5% of tetrabutoxyzircon based on wool and silica gel that had absorbed moisture. The above-mentioned wool was sprayed and mixed in an amount of 4% based on the wool.

Thereafter, it was kept in a surface treatment tank at 280° C. for 3 minutes to complete the treatment.

The fiber diameter of the wool was 9 to 15 μm, and the average thickness of the amorphous zircon compound on the fiber surface was 110 μm.

The treated wool and untreated wool were immersed in the cement alkaline solution described below, and the tensile strength of each was measured, and the results were as follows.

Tensile strength before immersion in cement alkaline solution: untreated wool 110 kg/7rtIl treated wool 180 kg/m1-k
17) 7/L/force ゛no NaOHKOHCa(OH)2
Composition of solution (PH=12.6) o, s8. ? /n 3.4
5g/lo, 489/l.

〈Example 3〉 Activated carbon powder was immersed in tetraph titanium and immediately filtered. Activated carbon adsorbed on tetraph oxidized titanium was added at 1% to wool, and activated carbon was soaked in tetraph oxidizircon. Fuller's earth is soaked and immediately filtered to give 1% of the wool, and water-absorbing shirasu balloons obtained by soaking the shirasu balloon in water for 1 hour are added to the wool at 5%. Sprayed and mixed on wool.

After that, it was kept in a surface treatment tank at 250°C for 2m1n,
Processing completed.

An amorphous mixed film of a titanium compound and a zircon compound was formed on the fiber surface, and the average film thickness was 200 mm.

The wool treated as described above had properties similar to those of Examples 1 and 2, and there was no need to separate and remove the adsorbent when using this treated wool as a filler.

Claims (1)

[Claims] 1. Mix an adsorbent in which an organic metal surface treatment agent is adsorbed to an inorganic fiber and an adsorbent in which water is adsorbed, and then heat to vaporize the organic metal surface treatment agent and water, and combine the vaporized organic metal surface treatment agent with the adsorbent. A method for surface treatment of inorganic fibers, which comprises forming an organic metal compound film on the surface of the inorganic fibers by contacting them with water vapor.