Fireproof magnesium oxide board and manufacturing process thereof

Abstract

The invention provides a fireproof magnesium oxide board and a manufacturing process thereof, and belongs to the field of fireproof building materials. The fireproof magnesium oxide board is prepared by mixing the following raw materials in parts by weight: 80-100 parts of magnesium oxide; 20-30 parts of anhydrous magnesium chloride; 10-20 parts of fireproof sepiolite fiber slurry; 20-30 parts of aluminum silicate fiber; 5-10 parts of sawdust; 10-15 parts of fly ash; 8-12 parts of glass magnesium board crushed powder; 1.5-5 parts of a non-woven fabric; and 6-8 parts of water. The preparation method of the fireproof sepiolite fiber slurry comprises the following steps: (1) preparation of modified sepiolite fabric: mixing sepiolite with a mixed acid solution 1 of hydrochloric acid and phosphoric acid; (2) alkali neutralization: mixing the sepiolite slurry subjected to acid activation with ammonia water; and (3) sequentially adding talcum powder, vegetable gelatin powder, polypropylene fibers, cellulose ether and a surfactant into the sepiolite slurry while stirring to obtain the fireproof sepiolite fiber slurry. The fireproof magnesium oxide board has good fireproof performance and smoke suppression performance.

Description

technical field [0001] The invention relates to a plate, in particular to a magnesium oxide plate and a manufacturing process thereof. Background technique [0002] Magnesium oxide board is a new type of multifunctional building material. Because it has the light weight, flexibility and reprocessing performance of wood-based organic boards, and has the fire resistance and water resistance of inorganic boards, it can be used in walls, ceilings, and floor linings. It is used in the decoration of boards and other parts with fire protection requirements. The main components of the current magnesium oxide board are glass fiber mesh cloth (the main source of the strength of the board), magnesium oxide, magnesium chloride, perlite, filling fiber and modified additives. However, the magnesium oxide board currently used has problems such as moisture absorption and halogen return of the board, embrittlement of the board, etc., which affects the quality of the product, and the fire an...

AI Technical Summary

Problems solved by technology

However, the magnesium oxide board currently used has problems such as moisture absorption and halogen return of the board, embrittlement of the board, etc., which affects the quality of the product, and the fire and heat insulation performance is also poor, which limits the wide application of the product.

Chinese patent application CN201310232377 attempts to use expansion foaming materials composed of melamine, pentaerythritol and ammonium polyphosphate, and obtains a certain flame retardant effect, but the flame retardant performance is difficult to meet the stringent requirements of the high-end market for flame retardant performance, such as the fire resistance limit value is greater than It is equal to 4 hours, so it is necessary to further add flame retardant fillers such as sepiolite to improve its fire resistance

[0004] However, currently in the field of fireproof coatings or fireproof boards, they are used as conventional fireproof fillers in the field of coatings or fireproof boards, and are added to coatings or fireproof boards together with other fillers Dispersed in the slurry, but the applicant found that there are many problems in the coating or fireproof board slurry that has added a large amount of sepiolite fibers: (1) Compared with flame retardants such as expanded vermiculite, magnesium hydroxide, antimony trioxide, etc. , its flame retardant properties need to be further improved; (2) During the drying and curing process of coatings or fireproof boards, the drying time is too long, which greatly reduces production efficiency. This is because sepiolite has good water absorption and water retention. Afterwards, the sepiolite forms a water-blocking barrier, which prevents the diffusion of water from the inside to the outside surface, causing the paint film and fireproof board to appear dry on the surface, but the actual interior is not dry, that is, although the surface dries quickly, it takes a long time to dry. (3) In the actual production process, when adding a larger amount of sepiolite, the viscosity of the system increases sharply, which will destroy the stability of the dispersion system, prolong the dispersion time, reduce production efficiency, and cause poor dispersion effects

Taking the fireproof board as an example, this is because sepiolite itself also has the function of a thickener, and when it enters water, it will quickly absorb water and flocculate, not only absorbing a large amount of water, but also rapidly increasing the viscosity of the slurry dispersion system during the board production process. This will lead to the re-agglomeration of the dispersed slurry, and reduce the stability of the polymer micelles, and in severe cases, sedimentation will occur

Images