JP3228444B2 - Method for suppressing dust generation of alumina fiber molded body and inorganic fiber molded body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alumina fiber molded article which greatly suppresses dust generation and a method for suppressing dust generation of an inorganic fiber molded article.

[0002]

_2. Description of the Related Art Conventionally, amorphous ceramic fibers containing 40 to 60% by weight of Al ₂ O _{3 and} 60 to 40% by weight of SiO ₂ have been widely used as heat insulating materials for industrial heating furnaces. A ceramic fiber mat, which is a dry laminate of ceramic fibers, and a ceramic fiber blanket which is further processed by needling and the like are used. Since the maximum operating temperature of these ceramic fibers is about 1260 ° C., in recent years, as a high-temperature industrial heating furnace heat insulating material, 60-100% by weight of Al ₂ O _{3 and} 40-0% by weight of SiO _{2 have been} used as crystalline alumina fibers. Has been developed, and an alumina fiber molded article obtained by cutting a mat or blanket of alumina fibers, which is a dry laminated body, into a certain size and forming the block into a block shape by bonding or the like is used.

[0003]

However, alumina fiber mats and blankets are brittle because the fibers constituting them are crystalline, and they are powdered when they are processed into blocks or when alumina fiber molded articles are used. There was a problem of doing. On the other hand, during the production of the crystalline alumina fiber blanket, there is an example in which a lubricant is applied to the precursor fiber in order to improve the slip between the fiber and the needle at the time of needling. Since the lubricant was decomposed and burned during the operation, the obtained alumina fiber molded body had no dust generation suppressing effect.

The present invention solves the above-mentioned problems in the matte or blanket of the crystalline alumina fiber and suppresses the generation of dust, and an inorganic fiber molded article applicable to the production of the alumina fiber molded article. It is an object of the present invention to provide a method for suppressing dust generation.

[0005]

That SUMMARY OF THE INVENTION The present invention is, e
Emulsion of a oxy-modified silicone oil and / or
Surfactant with a nitrogen-containing hydrophilic group introduced into a fatty acid ester
An alumina fiber molded article characterized by containing a dust generation inhibitor composed of a surfactant . Also, the present invention
After those the dusting agents are dissolved or dispersed in water is impregnated, contained in the inorganic fiber molded body, dusting suppressing method der inorganic fiber molded body, characterized in that the drying
Ri, by passing the inorganic fiber molded body that the dusting agents are dissolved or dispersed in water, after which the dusting inhibitor was impregnated, contained in the inorganic fiber molded body, the drying A method for suppressing dust generation of an inorganic fiber molded product , further comprising spraying a solution obtained by dissolving or dispersing the above dust generation inhibitor in water into the inorganic fiber molded product, thereby forming a dust in the inorganic fiber molded product. Impregnated with a generation inhibitor
This is a method for suppressing the generation of dust on the inorganic fiber molded article, characterized by drying after being contained.

Hereinafter, the present invention will be described in more detail. The alumina fiber molded body used in the present invention is
_It refers to a dry molded body of crystalline alumina fiber such as mullite or alumina containing 60 to 100% by weight of ₂ O _{3 and} 40 to 0% by weight of SiO ₂ . Specifically, it refers to mats, blankets, and the like and their processed products.

[0007] The dust generation inhibitor used in the present invention has an effect of preventing dust generation, has a large penetrating power to the alumina fiber molded product, and has a high adhesion to the alumina fiber . Emal
A nitrogen-containing hydrophilic group is present in John and / or the fatty acid ester.
It contains the introduced surfactant as a component.

Preferably, the emulsion is an epoxy-modified silicone oil having a viscosity of 10,000 cp or more.

Further, the fatty acid ester has a nitrogen-containing hydrophilic group.
The surfactants introduced with water-soluble and oil-soluble surfactants
The nitrogen-containing hydrophilic groups are amine salts, quaternary ammonium salts and the like.

The use amount of the dust generation inhibitor is preferably about 0.01 to 2% by weight based on the alumina fiber molded body.
If it is less than 01% by weight, the effect of suppressing dust generation is poor, and
Even if the content exceeds 2% by weight, the effect is not improved, but the water repelling action and the releasing action become stronger, and it is difficult to use an aqueous adhesive when the alumina fiber molded body is formed into a block-shaped molded body by bonding. Becomes The following methods (1) to (3) can be applied to make the alumina fiber molded body contain the dust generation inhibitor.

(1) A method of impregnating and containing an inorganic fiber molded article such as an alumina fiber molded article in which a dust generation inhibitor is dissolved or dispersed in water and then dried. Specifically, the dust generation inhibitor is dissolved or dispersed in water to adjust its concentration to 0.1.
After impregnating and containing 100% to 800% by weight of the inorganic fiber molded article, the content of 0.1 to 0.2% by weight, preferably 0.1 to 0.2% by weight, is dried at a temperature of about 50 to 180 ° C, In this method, the water content is adjusted to 10% by weight or less.

(2) A solution prepared by dissolving or dispersing the dust generation inhibitor in water is passed through the inorganic fiber molded product, so that the inorganic fiber molded product is impregnated with the dust generation inhibitor and then dried. Specifically, a method of dissolving or dispersing a dust generation inhibitor in water to a concentration of 0.01 to 3% by weight and spraying it from one surface, for example, the surface of the inorganic fiber molded body to the other is used. This is a method in which a dust generation inhibitor is impregnated and contained in an inorganic fiber molded article by discharging the powder from a surface, for example, a back surface, and then dried at a temperature of 50 to 180 ° C. to reduce the water content to 10% by weight or less.

(3) A solution prepared by dissolving or dispersing the dust generation inhibitor in water is sprayed into the inorganic fiber molded article by press-fitting, impregnated and contained in the inorganic fiber molded article, and then dried. Specifically, a solution in which a dust generation inhibitor is dissolved or dispersed in water to a concentration of 0.1 to 10% by weight is sprayed by press-injection into an inorganic fiber molded body, and then heated to a temperature of 5%.
This is a method of drying at 0 to 180 ° C. to reduce the water content to 10% by weight or less. The press fit sprayer sprayer is used with a spray nozzle, on the surface of the inorganic fiber molded body are brought into close contact with the nozzle, it is used by spraying at a pressure 4~20kg / cm ^2.

In the above methods (1) to (3), the inorganic fiber molded body includes inorganic oxide fibers such as alumina fiber, alumina-silica fiber, silica fiber, zirconia fiber, magnesia fiber, thoria fiber, chromia fiber and the like. A molded article composed of whisker, glass wool, rock wool, or the like of silicon carbide fiber, carbon, boron carbide, beryllia, alumina, silicon nitride, copper, tungsten, potassium titanate, aluminum borate and the like is used.

In the above method, it is preferable to use the methods (2) and (3) in order to make the alumina fiber molded article contain a dust generation inhibitor. This is because these methods are less likely to cause fiber breakage than the method (1) and have a small amount of water before drying, so that the drying operation is easy.

In addition to the dust generation preventive agent, polyethylene glycol ethers, polyoxyethylene derivatives such as alkyl phenol ethylene oxide adducts and fatty acid amide ethylene oxide adducts, dialkyl succinates, sodium dioctyl sulfosuccinate and the like are also used as penetration aids. When 0.01 to 1% by weight is added to the agent, the permeability of the dust generation inhibitor into the alumina fiber molded body is increased, and the impregnation treatment is facilitated.

[0017]

The present invention will be described below more specifically with reference to examples and comparative examples.

Example 1 Alumina fiber blanket (dimensions 25 mm × 300 mm)
× 300 mm, weight 300 g, chemical composition Al ₂ O ₃ 80% by weight, SiO ₂ 20% by weight) were prepared. Next, as a dust generation inhibitor, epoxy-modified silicone oil (viscosity 19)
000cp: Product name "KF100" manufactured by Shin-Etsu Chemical Co., Ltd.
T ") (30% by weight) in water 1
Almost all the powder dispersed in 500 g was impregnated in an alumina fiber blanket to make the content of the epoxy-modified silicone oil in the alumina fiber blanket 0.3% by weight, and then dried at a temperature of 100 ° C. to obtain a 1% water content alumina. A fiber molding was produced.

Example 2 As a dust generation preventing agent, an oil-soluble nitrogen-containing weak cationic surfactant (trade name "Tenlo 7" manufactured by San Nopco Co., Ltd.)
0 ") was dispersed in 1500 g of water,
The content of the surfactant with respect to the alumina fiber blanket was reduced to 1% by weight by spraying onto the surface of the same alumina fiber blanket as used in the above, and then dried at a temperature of 100 ° C. to obtain a water content. A 2% alumina fiber compact was produced.

Example 3 3 g of the same surfactant used in Example 2 was added to 40 g of water.
Was spray-injected into the same alumina fiber blanket as used in Example 1 by using a spray nozzle to reduce the content of the surfactant to the alumina fiber blanket to 1% by weight. By drying at a temperature of 100 ° C., an alumina fiber molded body having a water content of 2% was produced.

Example 4 Polyoxyethylene alkyl ether (trade name "Sammorin 11" manufactured by Sanyo Chemical Industries, Ltd.) as a penetration aid
Was prepared in the same manner as in Example 2 except that a dispersion of 2 g was used to produce an alumina fiber molded body having a water content of 2%.

Comparative Example 1 The same alumina fiber blanket as used in Example 1 was not treated with the dust generation inhibitor.

Each of the alumina fiber compacts obtained above was cut into 4 pieces (each piece having a size of 25 mm × 1) with a cutter knife.
It was cut into 50 mm × 150 mm), and compressed at a pressure 0.04 kg / cm ² from the vertical by superimposing them. Next, the powdery material generated when the air flow (temperature: 25 ° C.) at a wind speed of 10 m / s was applied to the laminated body of the alumina fiber molded body from which the compression was released for 5 minutes was removed, and the weight change before and after the operation was measured. It measured and set it as the amount of dust generation. Table 1 shows the results.

[0024]

[Table 1]

[0025]

According to the present invention, it is possible to obtain an alumina fiber molded article having a remarkable suppression of dust generation.

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI D04H 1/58 D04H 1/58 A // D06M 101: 00 D06M 101: 00 (56) References JP-A-2-131928 (JP, A) JP-A-53-65493 (JP, A) JP-A-4-77329 (JP, A) JP-A-49-115086 (JP, A) Japanese Utility Model Laid-open No. Sho 62-157220 (JP, U) (58) (Int.Cl. ⁷ , DB name) D06M 15/00-15/715 C04B 30/02

Claims (4)

(57) [Claims] 1. An emulsion of an epoxy-modified silicone oil.
A nitrogen-containing hydrophilic group is present in John and / or the fatty acid ester.
An alumina fiber molded article characterized in that it contains a dust generation inhibitor comprising an introduced surfactant . 2. Dust of an inorganic fiber molded body, wherein a substance obtained by dissolving or dispersing the dust generation inhibitor according to claim 1 in water is impregnated and contained in an inorganic fiber molded body, and then dried. Generation suppression method. 3. An inorganic fiber molded article is impregnated with and contained a dust generation inhibitor by dissolving or dispersing the dust generation inhibitor according to claim 1 in water through an inorganic fiber molded article. And drying after the drying. 4. A solution prepared by dissolving or dispersing the dust generation inhibitor according to claim 1 in water is sprayed into an inorganic fiber molded product by press-fitting to impregnate and contain the dust generation inhibitor in the inorganic fiber molded product. And drying after the drying.