JP2001279860A - Ultra light-weight incombustible board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a weight of an inorganic incombustible board in a scope of volumetric bulk density from 0.3 to 0.6 g/cm3 and enable mass production of a product by reducing a weight by 70% or more when compared with a conventional product. SOLUTION: Conventionally, when gypsum, cement, and calcium silicate are used to form a board for a building material, only the board having bulk density of 0.8 g/cm3 or more is realized currently in the world. Consequently, one piece of the conventional product has a weight of about 8 to 10 kg per square meter and is heavy, even if a thickness of the product is 6 millimeters. A weight of the product according to this invention having a thickness of 6 millimeters is 2.4 kg. The mass production of a light-weight product having a thickness of 2 millimeters to 12 millimeters or less is realized by stirring inorganic compounding raw material to contain air bubbles sufficiently and solidifying it to form the board while maintaining such strength that endures the use as a building material to solve the above-mentioned problem. The ultra light-weight incombustible board can be produced by reducing weight of 50% or more per square meter when compared with the conventional inorganic board product having the same thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention realizes mass production of ultra-light noncombustible boards for building materials at low cost, and replaces gypsum boards and other inorganic boards which have been dominant in the market up to now. It is intended to provide new materials. All bulk density conventional inorganic board is of 1.5 g / cm ³ of 0.8, but houses the realization of the present invention, to meet the demand for lightweight nonflammable board which has been determined from the building materials industry Because of this, the prospects for the application field are very large.

[0002]

2. Description of the Related Art Conventionally, in order to obtain various noncombustible approvals set by the Ministry of Construction for inorganic noncombustible boards, for example, plaster boards, etc., most of them cannot be obtained unless the thickness is 12 mm or more.
If the thickness is less than 12 mm, the limit of obtaining quasi-incombustibility was the limit. Therefore, it has been considered that even if the conventional inorganic board is light, the strength is poor unless the bulk specific gravity is 0.8 g / cm ³ or more, and it is inevitable that the weight of the product increases. The housing and construction industries demanded that inorganic boards be made lighter.However, it was decided to ban the use of asbestos and similar products, which were influential materials to make them lighter, from the viewpoint of the global environment. The development of the board is still undeveloped worldwide.

[0003]

(1) In order to reduce the weight of the inorganic non-combustible board, the inorganic compounded raw material is thermoformed and solidified so that the product has a bulk specific gravity of 0.3 to 0.6 g / cm ^3. An object of solving the problem is to cure the resin in a stable shape. (2) In order to achieve weight reduction, a problem to be solved is to reduce the thickness of the board to 12 mm or less and to provide various processing strengths required by the market even for a product having a thickness of 3 mm.

[0004]

[Means for Solving the Problems] (1) Means for Reducing the Weight of Inorganic Hydrates Various types of hydratable inorganic materials are used as main components, and water and a substance that adds viscosity are added to increase the viscosity, and the mixture is stirred. A solution for realizing a lightweight non-combustible board by rapidly forming a paste-like compounded raw material expanded into a state containing a large amount of air bubbles and maintaining the expanded shape including air bubbles even after cooling. And The bulk specific gravity conditions for reducing the weight of the obtained board are determined by adjusting the stirring time, the size and rotation speed of the mixing rotary screw, and the amounts of the added viscous substance and water. In particular, it has been found that fine adjustment of the mixing ratio of magnesium oxide is an important key in order to increase the weight of the product. It is also effective to add a means of expanding chemical reaction by mixing and mixing tartaric acid with chemicals that generate oxygen and carbon dioxide gas that do not adversely affect the environment, such as baking soda, because bubbles are contained in the blended raw material. Although it is effective to use a harmless blowing agent other than fluorocarbon gas, the present invention makes maximum use of air. (2) Means for giving strength to the board with a thickness of 12 mm or less Use an inorganic woven fabric on the front and back surfaces and select a mesh suitable for the required strength. The strength increases in proportion to the density of the woven fabric. In addition, vegetable woody microchips and fibers are mixed into the inorganic hydrate of the main material to increase the strength. In redistributing the quality of bending fracture load of products, especially in the compounding of raw materials of products with a thickness of 6 mm or less, rediscovering the importance of viscosity control, sufficient magnesium oxide component ratio, and sufficient stirring time, Means.

[0005]

The lightweight inorganic non-combustible board obtained by the development technique of the solution has achieved the action of passing (including prospects) the non-combustible approval standard for building materials set by Japan and other countries. In addition, since the raw materials pointed out to be harmful to the global environment are not used, the lightweight non-combustible board according to the present invention does not emit any harmful substances such as formaldehyde, various solvents and asbestos, and also as industrial waste It has the effect of returning to safe soil components only by grinding.

[0006]

【Example】 Between the front and back glass woven fabrics of the above (1), add the same amount of water to the blended raw materials of the above (2) and mix by rapid stirring for about 10 minutes or more. Then, it is rapidly thermoformed, solidified into a 6 mm thick plate and cooled to stabilize the shape. The product specific gravity is 0.5 g / cm.
A light and incombustible board with a thickness of about ³ is completed.

[0007]

The lightweight inorganic noncombustible board manufactured by the method according to the present invention passes the noncombustible standard for building materials specified in Japan. For example, the impact of nailing or tacking despite its thickness of 6 mm or less is obtained. The effect of realizing a product that can be cut with a saw or a cutter knife is produced. While the conventional inorganic board having a thickness of 6 mm weighs about 8 to 10 kg per square meter, the product weight according to the present invention is around 2.4 kg and the conventional product bulk specific gravity is 1.0.
g / cm ^{3 for} the weight of the same thickness of inorganic board,
The board obtained by the present invention has the effect of realizing a weight reduction of 70% or more.

[0008]

[Brief description of the drawings]

FIG. 1 uses a glass woven fabric 1 as a front and back material according to claim 1,
The compounded material expanded by including bubbles by agitation is inserted between the front and back materials, and is thermoformed into a plate shape. The bulk specific gravity obtained while maintaining the expanded shape even when cooled is 0.3 to 0.3.
Was achieved 0.6 g / cm ³ is a structural side view of the ultralight noncombustible board.

[Explanation of symbols]

 1 Glass woven cloth 2 Hydrated inorganic cured product containing air bubbles

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04B 1/94 E04B 1/94 V

Claims (1)

[Claims] 1. A hydratable inorganic oxide of silica, aluminum, calcium or the like containing magnesium oxide in a range of 30% to 65% between a surface material and a back material of an inorganic woven fabric as a main component. While adding water and stirring, while continuously inserting the mixture and the compound in a state of expansion including bubbles,
The thickness of the product obtained by thermoforming into a plate while keeping the expanded state of the insertion material as much as possible and then cooling and hardening is 2 mm or more and 12 mm or more.
Less than millimeter, product specific gravity 0.3 to 0.6 g / cm
³ , and a lightweight noncombustible board obtained such that the breaking load strength becomes 150 kgf / cm ² or more.