Reactive type intumescent flame retardant for water-based polyurethane and preparation method of reactive type intumescent flame retardant

Abstract

The invention relates to the field of fine chemical engineering materials and specifically relates to a reactive type intumescent flame retardant for water-based polyurethane, which simultaneously contains a carbon source, an acid source, a gas source and active amino groups, and a preparation method of the reactive type intumescent flame retardant. The chemical structure of the reactive type intumescent flame retardant disclosed by the invention is as shown in formula I, the obtained flame retardant does not contain halogen, has relatively high content of phosphorus and nitrogen flame retardant components and shows an aromatic heterocyclic structure, thereby having good stability at high temperature, high char yield, significant intumescence and excellent flame retardance. Two active primary amino hydrogen ions contained in the structure can react with isocyanate to prepare flame-retardant water-based polyurethane, thereby not only effectively solving the problems of poor compatibility, easiness in migration, precipitation and permeation and the like of a traditional complex additive type flame retardant in a water-based polyurethane system, but also overcoming the defect that the physical and mechanical properties of water-based polyurethane become poor caused by the complex additive type flame retardant. When the reactive type intumescent flame retardant provided by the invention is used for preparing water-based polyurethane, the process is easy to control, the properties are easy to regulate, and prepared water-based polyurethane is widely applied to leather finishing, synthetic leather coatings, fabric coatings, building fireproof materials, coating materials, adhesives and other industries. The formula I is described in the specification.

Description

technical field [0001] The invention specifically relates to a reactive intumescent flame retardant for water-based polyurethane containing a carbon source, an acid source, a gas source and an active group amino group and a preparation method thereof, belonging to the field of fine chemicals. Background technique [0002] Intumescent Flame Retardant (IFR), with phosphorus and nitrogen as the main flame retardant components, is a new type of environmentally friendly flame retardant that integrates carbon sources, acid sources and gas sources. When this kind of flame retardant is heated, the phosphorus-nitrogen synergistic flame retardant effect in the molecule can occur, and a uniform and dense carbon foam layer is formed on the surface of the polymer, which has the functions of heat insulation, oxygen insulation, smoke suppression, and drip prevention. etc., and the generated non-combustible gas can dilute the flammable gas released when the polymer burns, and it is a new ty...

AI Technical Summary

Problems solved by technology

However, the content of phosphorus (14.26%) and nitrogen (6.45%) in the flame retardant disclosed in this patent is low, and the four hydroxyl groups in the molecule react with polyurethane to form a cross-linked network structure. The high functionality makes the polymerization process difficult to control (easy to coagulate Adhesive), the transitional crosslinking has an adverse effect on the regulation of the thermodynamic properties of polyurethane coating materials

Images