Non-molten-drop flame-retardant polyurethane adhesive and non-molten-drop flame-retardant reflective hot paste

Abstract

The invention relates to a non-molten-drop flame-retardant polyurethane adhesive and a non-molten-drop flame-retardant reflective hot paste, and provides the non-molten-drop flame-retardant polyurethane adhesive and the non-molten-drop flame-retardant reflective hot paste in order to solve the problem that the existing non-molten-drop flame-retardant polyurethane adhesive and the non-molten-drop flame-retardant reflective hot paste are easy to melt. The flame-retardant polyurethane adhesive comprises a composite flame retardant including, by mass, 5.0-10% of spirocyclic phosphate ester; 2.0-5.0% of aluminum hydroxide; 6.0-9.0% of fumed silica; 2.0-3.0% of melamine phosphate; and 5.0-10% of diethyl hypophosphite. The hot paste comprises a flame-retardant hot melt adhesive layer, the non-molten-drop flame-retardant polyurethane adhesive layer and a glass bead layer are sequentially arranged on the flame-retardant hot melt adhesive layer, and a metal coating layer is arranged between the non-molten-drop flame-retardant polyurethane adhesive layer and the glass bead layer. The polyurethane adhesive and the hot paste have the effective characteristics of no molten drops and good flame retardance through the synergistic effects of all the components of the flame retardant system, and have the effects of short afterflame time and avoidance of smoldering.

Description

technical field [0001] The invention relates to a droplet-free flame-retardant polyurethane glue and a droplet-free flame-retardant reflective heat sticker, which belong to the technical field of reflective materials. Background technique [0002] As we all know, the existing reflective thermal paste is a heat-transfer reflective material that uses PU or PES as a hot-melt adhesive layer and uses metal-coated glass beads to reflect light. When in use, the reflective properties of reflective materials such as reflective heat stickers can reflect the incident light back, making it widely used in transportation, fire protection, railways and other fields, and also commonly used in road maintenance and safety clothing for firefighters. The material's reflective properties are used to highlight the wearer's presence for added safety. More importantly, in some fields with high fire safety requirements, ordinary reflective thermal stickers cannot meet the needs of use, and reflecti...

AI Technical Summary

Problems solved by technology

More importantly, in some fields with high fire safety requirements, ordinary reflective heat stickers cannot meet the needs of use, and reflective products with better flame retardant properties need to be used

[0003] At present, the flame retardant performance of flame retardant reflective products is usually achieved by adding flame retardants to the material to prevent the danger caused by its combustion. etc. itself has good flame retardancy, but the material of the adhesive layer (polyurethane glue) in these flame-retardant reflective products will have a droplet phenomenon at high temperature, and there will be a problem of dripping, which will lead to the adhesive layer after the droplet Hazard of secondary combustion caused by material, etc. dripping onto other substances

For example, in conventional reflective heat stickers, the material of the adhesive layer that glues each layer together is usually made of polyurethane pressure-sensitive adhesive for the compounding of each layer, and for polyurethane pressure-sensitive adhesives, it is also conventional to add a flame retardant to it. To achieve flame retardant properties, the flame retardant of polyurethane materials includes two basic types of flame retardant systems, halogen flame retardant systems and non-halogen flame retardant systems, and halogen flame retardants are usually made by synergistic trioxidation containing bromine flame retardants Antimony, when burning, will produce harmful substances such as dense smoke and hydrogen bromide, and it cannot prevent dripping, and it is prone to dripping when it is on fire, which will affect the flame retardant performance

Another example is the existing conventional flame retardants such as non-halogen inorganic flame retardants such as aluminum hydroxide and aluminum dioxide, as well as organic halogen-free flame retardants or nitrogen-based and phosphorus-based flame retardants, but none of them can To solve the problem of dripping, it is prone to dripping when it is on fire, and there is a long burning time and smoldering phenomenon, which will also cause dangers such as secondary combustion

Images