Preparation method of flame-retardant polyurethane aluminum alloy composite board

Abstract

The invention discloses a preparation method of a flame-retardant polyurethane aluminum alloy composite board, which belongs to the technical field of casting materials. The flame-retardant polyurethane aluminum alloy composite board is mainly composed of an aluminum foil sheet and polyurethane, an adhesive is not required to be used, the aluminum foil sheet and the polyurethane form a firm whole,and the strength and rigidity of an aluminum veneer curtain wall are greatly enhanced. The flatness and the wind resistance and shock resistance in long-term use are guaranteed, and the polyurethanecan play a good role in heat insulation and sound insulation and has a good flame retardant property.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for preparing a flame-retardant polyurethane aluminum alloy composite board. Background technique [0002] Aluminum-plastic panel is a new type of decorative material with a series of excellent properties. It has been widely used in curtain walls, indoor and outdoor decoration and other fields soon after it came out. The so-called aluminum-plastic panel refers to a compound made of aluminum and plastic. sheet. Specifically, the aluminum plate and the plastic core material are bonded and compounded by a special adhesive under certain process conditions. In practice, the front and back aluminum plates are generally coated first, and then compounded with the plastic core material. The front panel is generally coated with a decorative coating, and the back panel is coated with a protective coating. Regarding the structure of the aluminum-plastic panel, it is gener...

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Problems solved by technology

If the aluminum-plastic panel is seriously deformed and glued under the action of itself or the structural stress after being used for a period of time, it will seriously affect the quality and safety of the building, and the quality of the aluminum-plastic panel during the composite process will be bulging due to the influence of the adhesive. There are many problems and defects such as bubbles, plate depressions, ruffles and poor bonding, while the core board is extruded with granular infusibles, and when the average diameter of these infusibles exceeds a certain level, it will protrude from the core. On the surface of the board, bubbles will be caused when the board is laminated. After we peel off the aluminum board, we will find that there are signs of poor bonding around the bubbles. The reason for this sign is that the bubbles are in the rolling compound At this time, the air around the bubble cannot be completely squeezed out and is sandwiched between the layers. The extremely thin air layer blocks the full adhesion of the layers.

There are thumbprint-sized collapses on the surface of the aluminum-plastic board. This problem is caused by the uneven dispersion of the adhesive. When the agent is used, the adhesive force of the adhesive layer will also be slowly destroyed, and degumming will occur. Moreover, the existing polyurethane, foamed polyethylene, and expanded polystyrene have poor flame retardancy, which is not conducive to meeting the requirements of flame retardancy. It is used in the field of high building curtain wall decoration, which has obvious potential safety hazards. Those skilled in the art urgently need to develop a preparation method for flame-retardant polyurethane aluminum alloy composite panels to meet the existing use requirements.