A non-droplet, water-stained, halogen-free flame-retardant polyurethane resin and its application

Abstract

The invention discloses a halogen-free flame-retardant polyurethane resin without molten drops and water stain. The polyurethane resin comprises the raw materials by the weight percentage: 65-90% of apolyurethane matrix material, 5-20% of aluminum diethylphosphinate, and 1-15% of a carbon forming component; the carbon forming component is an insoluble infusible cross-linked polymer, and a crosslinking point structure is represented by the following formula (I). The invention discloses the halogen-free flame-retardant polyurethane resin without molten drops and water stain; the polyurethane resin material has the advantages of high flame retardancy, no molten drops, no water stain, migration resistance and the like, is used for preparation of halogen-free flame-retardant polyurethane leather, and is further applied to the fields of high-flame-retardancy requirements in furniture, transportation tool interior trim parts and the like.

Description

technical field [0001] The invention relates to the technical field of halogen-free flame-retardant polyurethane, in particular to a halogen-free flame-retardant polyurethane resin without molten droplets and water stains and its application in halogen-free flame-retardant polyurethane leather. Background technique [0002] Polyurethane is a type of polymer whose main chain contains -NHCOO- repeating structural units, abbreviated as PU in English, which is polymerized from isocyanate (monomer) and hydroxyl compound. Because it contains a strong polar carbamate group, it is insoluble in non-polar solvents, and has good oil resistance, toughness, wear resistance, aging resistance, etc., and has been widely used in many fields. Among them, synthetic leather is an important application of polyurethane materials. It has soft and natural luster, soft touch, and a strong leather-like appearance. It has excellent adhesion to the substrate, wear resistance, flex resistance, aging res...

AI Technical Summary

Problems solved by technology

At present, the most widely used are ammonium polyphosphate (APP) with high polymerization degree and organic phosphates, ammonium polyphosphate (APP) flame retardant system with high polymerization degree, which belongs to an intumescent flame retardant system, because of its flame retardant Compared with the inorganic hydroxide system, the addition amount is much lower than that of the inorganic hydroxide system. However, APP is still incompatible with the base material due to its hydrophilic surface and certain water solubility. Therefore, the flame-retardant polyurethane material of the APP system The mechanical strength is still very low, and at the same time, it is easy to migrate and precipitate, and the whitening phenomenon of precipitation occurs on the surface of the product

In addition, due to the presence of ammonium ions, APP is easy to absorb moisture. After a period of time, there will be water droplets on the surface of polyurethane leather products, or after the leather is exposed to water, water stains will form on the surface of the product after drying, which will affect the appearance of the product. At the same time, it will be sticky. Hand feeling reduces the touch of polyurethane leather; while organic phosphates, some are still water-soluble, although some have low water solubility and overcome the problem of water stains, but their flame retardant mechanism belongs to condensed phase flame retardant, which is non-expanding. For non-intumescent flame retardant systems, polyurethane materials are prone to dripping when they catch fire, and the molten droplets will affect the flame retardant effect, so it is difficult to meet the requirements of the standard

[0007] In general, the main defects of the flame retardant system currently applied to polyurethane leather materials are: poor flame retardancy, easy to melt, easy to absorb moisture to form water spots, migration and whitening, etc.

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