JPH1180538A - Incombustible inorganic elastomer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an incombustible elastomer produced by using an inorganic material. SOLUTION: This incombustible elastomer can be produced by adding an NCO-terminated prepolymer derived from various isocyanates and a polyethylene glycol ether as a crosslinking agent to an aqueous solution containing 100 pts.of water and <=80 pts. of a material selected from various incombustible inorganic materials having affinity to hydroxyl group (the solution may further contain <=50 pts. of magnesium hydroxide for the adjustment of hardness) and promoting the reaction by stirring the mixture to effect the formation of a chemical bond between the hydroxyl group in the aqueous solution of the inorganic material and the NCO group of the prepolymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The inorganic noncombustible elastomer of the present invention can be molded at low cost by mass production, utilizing the fact that it can be produced in a normal temperature (10 to 30 degrees Celsius), normal pressure environment. Products can be realized. As the market, as the basic materials for housing construction, automobile-related, etc., the future application field will use low-priced main raw materials and abundant reserves all over the world, so that low-price stable mass production is possible. Is expected to develop on a global scale.

[0002]

2. Description of the Related Art Conventionally, there is no product of the concept of an inorganic elastomer which is nonflammable, whose hardness can be freely controlled, and can be mass-produced. Absent.

[0003]

Problems to be solved by the present invention are as follows. (1) To realize an elastomer product by selecting an inorganic substance that is compatible with a hydroxyl group and chemically bonding it with a very small amount of a crosslinking agent in order to maintain nonflammability. (2) Ability to freely control the hardness and softness of elastomer products. (3) No solvent is used to ensure odorlessness. (4) Stable mass production can be realized at a low price.

[0004]

[Means for Solving the Problems]

(1) Among various non-flammable inorganic substances, those having a hydroxyl group or those which are easy to mix with water were selected from those which have not been concerned about safety for a long time. (2) Magnesium hydroxide is used to make the hardness of the elastomer flexible. (3) No solvent is used to ensure odorlessness. (4) An NCO-terminated prepolymer was used to select a material that functions as a crosslinking agent at normal temperature and normal pressure in order to realize stable mass production and low cost.

[0005]

After mixing various inorganic materials in a predetermined ratio and mixing and stirring well, adding a prepolymer at the NCO end and further mixing and stirring, the NCO group of the cross-linking agent acts to generate a small amount of carbon dioxide gas. The bond formed into an elastomer.

[0006]

EXAMPLES Composition (1) Water 400 g (2) Sodium silicate 600 g (3) Magnesium hydroxide 100 g (4) Crosslinking agent (NCO-terminated prepolymer) 200 g (5) Silicone (stabilizer) 20 g Above (1) And (2), (3) and (5) are mixed well and dispersed well. Thereafter, (4) is added and further stirred to obtain an inorganic elastomer.

[0007]

【The invention's effect】

(1) The elastomer according to the present invention can be freely adjusted by adjusting hardness and softness with magnesium hydroxide. (2) The elastomer of the present invention has nonflammability. (3) The elastomer of the present invention has no odor such as a solvent. (4) Since the main raw material of the present invention is a cheap inorganic substance, it can be mass-produced at a low price. (5) The elastomer product of the present invention has excellent soundproofing and vibrationproofing effects. (6) The elastomer product of the present invention can be mass-produced into a sheet having a free thickness. (7) The elastomer product of the present invention can be mass-produced into a freely moldable shape.

Claims (1)

[Claims] 1. An aqueous solution containing an arbitrary amount of 80 parts or less selected from various non-combustible inorganic substances which are easily incompatible with hydroxyl groups with respect to 100 parts of water. If necessary, add various isocyanates and a prepolymer at the NCO group end with polyethylene glycol ether as a cross-linking agent and mix and stir to promote the reaction. The hydroxyl groups contained in the inorganic aqueous solution will chemically react with the NCO groups of the prepolymer. Odorless, nonflammable elastomer obtained by bonding.