Fireproof magnesium oxide board

Abstract

A fireproof magnesium oxide board is made from, by weight, 80-100 parts of magnesium oxide, 20-30 parts of anhydrous magnesium chloride,10-20 parts of a modified expanded vermiculite foaming agent, 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 crushing powder, 1.5-5 parts of a non-woven fabric and 6-8 parts of water. Themodified expanded vermiculite is prepared in the following steps that (1) vermiculite is expanded incompletely and calcinated; (2) incompletely expanded vermiculite is added into a solvent to obtain vermiculite suspension liquid, and the suspension liquid and a carbonization catalyst are added into a closed reactor, the temperature rises, and high-speed stirring and heat preservation are conducted; (3) a low-molecular-weight carbon source and a foaming agent are added into the vermiculite suspension liquid for ultrasonic dispersion; (4) the solution is subjected to centrifugal separation, anda precipitate is dried primarily to obtain the fireproof expanded vermiculite. 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 equals 4 hours

[0004] In the prior art, a series of attempts have been made to modify vermiculite to obtain higher performance. For example, a Chinese invention patent with a notification number of 100404612 discloses a "expanded vermiculite / potassium polyacrylate-acrylamide super absorbent Composite material preparation method", this method directly uses expanded vermiculite as raw material, and prepares super water-absorbent composite material through graft copolymerization of potassium acrylate and acrylamide monomer; this method uses expanded vermiculite at normal temperature as raw material and Combining organic matter, the prepared material has the characteristics of oleophobic and hydrophilic, and cannot be used in the field of hydrophobic materials

The Chinese invention patent application with the notification number CN1800072A discloses a "dry method for rapidly preparing intercalated vermiculite". According to a certain ratio, the quaternary ammonium salt intercalation vermiculite is directly synthesized in a torque rheometer at 100-180 ℃; this method directly modifies the unexpanded vermiculite raw material, and the product density is relatively high. , carriers and organic composite fillers and other fields are limited

[0005] But at present, the use of vermiculite as a fireproof functional filler in coatings or fireproof boards is only to add expanded vermiculite directly or use it together with other fireproof coatings such as intumescent flame retardant systems and halogen-containing flame retardant systems. Research on Fireproof Modification of Stone

Shijiazhuang Yichen Fireproof and Thermal Insulation Material Co., Ltd. has carried out a series of researches and attempts. Among them, CN109321021A uses a fireproof modifier composed of a low-molecular carbon source, a carbon-forming catalyst and a foaming agent to treat incompletely expanded vermiculite. Improvement has significantly improved the fireproof effect of vermiculite and conventional fireproofing agents, but it has been found in actual use that if ammonium polyphosphate is used as the char-forming catalyst, the fireproof effect of the modified expanded vermiculite is obviously not as good as that of ammonium dihydrogen phosphate, ammonium dihydrogen phosphate, Expanded vermiculite with catalysts such as ammonium metaphosphate, the specific reason is unknown

But as we all know, the flame retardant effect of ammonium polyphosphate (APP) is the same as that of other ammonium phosphate salts, but there are no problems such as poor water resistance and easy recrystallization of other ammonium phosphate salts. Due to its good thermal stability, the amount of P and N contained Higher, low water solubility, no moisture absorption and other advantages, ammonium polyphosphate has been widely used in fireproof coatings, especially ammonium polyphosphate also has the advantage of low cost, for the current market competition is fierce, cost control has become the key to the survival of enterprises , therefore, the limitation of the use of ammonium polyphosphate in the above-mentioned technical solutions makes the production technology urgently need to be improved.

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