JPH09210289A - Manufacture of insulating molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an insulating molded body utilizing waste material effectively by mixing new inorganic fibers into the insulator obtained by dissolving the waste material of inorganic fiber insulator so as to provide cotton shape and mixing binders into the cotton like fibers before formation. SOLUTION: Waste material of insulator in which inorganic fibers such as felt and blanket are used is charged into a fiber dissolving machine so as to dissolve fibers into fine fibers or lumps in which multiple fibers are connected to each other. When the fibers are dissolved into a fiber length of approximately 40 to 50mm on an average, large fiber lumps are eliminated, and the entire fibers are uniformed, and thus inorganic fibers can be mixed satisfactorily. Next new inorganic fibers such as lock wool, glass wool, and ceramic fiber of 40 to 50mm in length are mixed into the dissolved insulator so as to form them into cotton form, and binders such as phenol, resin, and urea resin are fed and dried by a forming press so as to produce an insulating molded body. Thus, because inorganic fibers are used, the fibers can be used as noncombustible insulator excellent in insulation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a heat insulating molded body by effectively utilizing an inorganic fibrous heat insulating material discarded as industrial waste.

[0002]

2. Description of the Related Art Conventionally, heat insulating materials using inorganic fibers such as rock wool and glass wool have been widely used as heat insulating materials for buildings or industrial furnaces. In many cases, these are used in the form of a blanket in which inorganic fibers are simply matted or in the form of felt formed into a plate shape with an organic binder such as phenol resin.

[0003]

By the way, such a heat insulating material is simply discarded as industrial waste after being removed due to deterioration or after being demolished in a building. However, recently, there is a demand for reduction of industrial waste, and it is also demanded not to dispose of heat insulating materials as well. Therefore, it is desired to effectively use the inorganic fibrous heat insulating material generated as industrial waste, but the present situation is that no suitable method has been found yet.

The present invention has been made based on such a demand, and an object thereof is to provide a method for producing a heat insulating molded body by effectively utilizing a waste material of an inorganic fibrous heat insulating material.

[0005]

Means for Solving the Problems As a result of studies to achieve the above object, the present inventors defibrated waste material of inorganic fibrous heat insulating material and mixed new inorganic fibers with the defibrated heat insulating material. And a cotton-like shape, and a method of manufacturing a heat insulating molded body, characterized by mixing and molding a binder,

[0006] is provided.

[0007]

The present invention will be described in more detail below. The waste material used in the method of the present invention is arbitrary as long as it is a heat insulating material using inorganic fibers, such as felt, blanket, and wire sewn together. These waste materials are defibrated by a defibrating machine and loosened into a fine fibrous form or a lump form in which a plurality of fibers are adhered. The degree of defibration at this time is selected so that the average fiber length is about 40 to 50 mm. When the fibers are defibrated to have such a fiber length, large lumps of the fibers are eliminated, the whole becomes relatively homogeneous, and the inorganic fibers can be mixed well.
Even if a metal such as wire is mixed in the waste material to be defibrated, there is no problem because it is cut at the time of defibration and becomes a relatively short fiber.

Next, new inorganic fibers are mixed into the defibrated heat insulating material to form cotton. Here, mixing new inorganic fibers is to reduce the specific gravity as a whole and increase the voids,
This is for enhancing the heat insulating effect and for increasing the shape retention by increasing the entanglement between the fibers. Therefore, as the inorganic fibers to be used, fibers having a relatively long fiber length are selected.
However, if the fiber length becomes too long, the mixing becomes difficult. Taking these into consideration, the fiber length is usually 10 to 100 m.
The thing of about m, preferably 40-50 mm is used. The material of the new inorganic fiber may be any of rock wool, glass wool, ceramic fiber, etc. Among them, ceramic fiber is preferable because it has high heat resistance and high strength. The fiber diameter of the inorganic fiber is not particularly limited, and a commercially available one may be appropriately used, but a thinner one is preferable because the entanglement between the fibers can be increased and the specific gravity can be reduced. For example, when ceramic fibers are used, those having a fiber length of 50 to 100 mm and a fiber diameter of about 7 to 10 μm are preferably used. As a result, it is possible to obtain a heat insulating property and a shape which are almost the same as those of the conventional heat insulating material.

After the defibrated heat insulating material and the new inorganic fiber are mixed to form a cotton-like material, a binder is supplied thereto and dried by a molding press to produce a heat-insulated molded body. As the binder used here, known binders can be appropriately used. The shape of the heat insulating molded body to be produced is arbitrary such as a plate shape and a tubular shape,
A preferred shape may be selected according to the place of use. As described above, the heat insulating material, which is an industrial waste, can be collected and recycled to form a heat insulating molded body. Phenol, resin and urea resin are effective as the binder. You may put in a binder like mixing. A binder is added to the defibrated fiber, but when the new fiber contains a binder, the new fiber may be mixed without adding the binder.

[0010]

EFFECTS OF THE INVENTION Since the obtained heat insulating molded article uses inorganic fibers, it has excellent heat resistance and can be used as a non-combustible heat insulating material. Further, by mixing new inorganic fibers, the structure has a small specific gravity and sufficient voids, and has a heat insulating property required as a heat insulating material. Furthermore, since the industrial waste is effectively used, it can be manufactured at low cost.

[0011] The waste material of glass wool was collected and disentangled in a defibrating machine to obtain a defibrated heat insulating material having an average fiber length of about 40 mm. Next, glass fibers having an average fiber length of 50 mm and a fiber diameter of 7 μm were added to this defibration heat insulating material at a ratio of 150 parts by weight to 100 parts by weight of glass wool waste material, and both were defibrated by a defibration machine and mixed. And made cotton-like. Add a binder (material: phenol) to this cotton-like material,
%, Then heat and mold with a molding press to obtain a thickness of 2
A 0 mm heat insulating molded body was obtained. The bulk specific gravity of the obtained heat-insulating molded article was measured and found to be 50 kg / m ³ . When this heat insulation property was measured, the thermal conductivity was 0.037 kca.
It was 1 / m ² h ° C. and had good heat insulating properties.

As described above, according to the present invention, the waste material of the inorganic fibrous heat insulating material is collected, the waste material is defibrated by a defibrating machine, and the defibrated heat insulating material is mixed with new inorganic fibers to form a cotton-like material. By mixing and molding the binder, it is possible to recycle waste materials to produce a heat insulating molded body, and to obtain an inexpensive heat insulating molded body by effectively utilizing industrial waste. It has the effect of contributing to the reduction of waste. Moreover, since the obtained heat insulating molded article is made of inorganic fiber, it has excellent heat resistance and can be effectively used for a non-combustible structure.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 596029672 1-37-6 Nakazato, Kita-ku, Tokyo (72) Inventor Kazuhiko Ishiyama 4-4-2 Uedoda, Toda City, Saitama Japan Jacket stock In-house (72) Inventor Shuji Kikuta 8-21-1, Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo head office (72) Inventor Yoshiaki Nagasawa 8-21, Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor table Yukio Tokyo Ginza 8-21-1 Chuo-ku Tokyo Stock Company Takenaka Corporation Tokyo Main Store (72) Inventor Yasuhiro Yamamoto 8-21 Ginza Chuo-ku, Tokyo No. Stock Company Takenaka Corporation Tokyo Main Store (72) Inventor Takashi Nakamichi 1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Yuji Ikezaki Tokyo Inn-ku, Nishi 1-chome 25th No. 1 Taisei Construction Co., Ltd. (72) inventor Susumu MIZUKOSHI, Chiyoda-ku, Tokyo Surugadai, Kanda 4-chome address 2 8 Takasago Thermal Engineering Co., Ltd. in

Claims (3)

[Claims] 1. A heat insulating molded article characterized by defibrating a waste material of an inorganic fibrous heat insulating material, mixing the defibrated heat insulating material with a new inorganic fiber to form a cotton-like shape, and mixing a binder to form the mixture. Manufacturing method. 2. The ratio of the new inorganic fibers mixed with the defibrated heat insulating material is 100 parts by weight of the former and 12 of the latter.
It is 0-200 weight part, The manufacturing method of the heat insulation molded body of Claim 1 characterized by the above-mentioned. 3. A new inorganic fiber to be mixed with the defibrated heat insulating material has a fiber length of 40 to 50 mm and a fiber diameter of 7 to 10 μm.
The method for producing a heat insulating molded body according to claim 1, wherein the heat insulating molded body is m ceramic fibers.