Refractory article and production method thereof
AssigneeCovestro Deutschland AG
InventorsYuudai Kashiwamoto, Toshikazu Momii, Masayuki Fujidai
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Abstract
The present invention provides a refractory article which is fire resistant, heat resistant, and light weight, and which is suitable for use as a building material. The refractory article comprises (1) a core material and (2) a refractory layer which covers one or more surface of the core material, and comprises a polyisocyanurate resin. The core material (1) may be a glued laminated timber. Suitable polyisocyanurate resins may be obtained by reaction of a polyisocyanate in the presence of a polyol. A flame retardant may be present in the polyisocyanurate resin.
Claims7
A refractory article comprising
- (1) a core material comprising a composite wood-based structural material
- and
- (2) a refractory layer covering one or more surfaces of the core material, and
- comprising a non-foamed polyisocyanurate resin, wherein:
- the non-foamed polyisocyanurate resin comprises the reaction product of a polyisocyanate with an active hydrogen-containing compound, and a flame retardant;
- in which said active hydrogen-containing compound comprises a polyol having two or more hydroxyl groups, a hydroxyl number of 120 to 2000 mg-KOH/g, a functionality of 2 to 4, and a molecular weight of 50 to 2000;
- and from 5 to 30 parts by weight of said active hydrogen-containing compound is used per 100 parts by weight of polyisocyanate;
- and said flame retardant comprises from 10 to 20 parts by weight of aluminum hydroxide and from 5 to 10 parts by weight of red phosphorus, based on 100 parts by weight of said polyisocyanate, wherein the weight ratio of aluminum hydroxide to red phosphorus is from 1:1 to 4:1.
Dependencies are inferred from the claim text.