Preparation method of halogen-free intrinsic flame-retardant waterborne polyurethane film

Abstract

The invention discloses a preparation method of halogen-free intrinsic flame-retardant waterborne polyurethane. The preparation method comprises the following steps: firstly, performing a reaction onphosphorus oxychloride with pentaerythritol to prepare an intermediate product with a diphosphoryl chloride functional group; performing a reaction on the intermediate product with diglycolamine and other substances, thereby preparing a micromolecular flame retardant containing phosphorus and nitrogen flame-retardant elements, and finally performing a reaction on the micromolecular flame retardantserving as a hard segment chain extender with polyether polyol, isophorone diisocyanate, 2,2-dimethylolpropionic acid and other substances to prepare the halogen-free intrinsic flame-retardant waterborne polyurethane. According to the invention, the reactive halogen-free intrinsic flame-retardant waterborne polyurethane is prepared by taking the halogen-free flame retardant as a reaction substance, so that the product is good in flame-retardant effect, simple in synthesis method and relatively low in cost, has very good practicability and economy, and has a good market prospect.

Description

technical field

[0001] The invention relates to a preparation method of a halogen-free intrinsically flame-retardant water-based polyurethane film, which has the characteristics of good thermal stability and high flame retardancy, and belongs to the field of functional materials. Background technique

[0002] Waterborne polyurethane (WPU) is a binary colloid system that uses water as a dispersing agent. It has many excellent features, such as low pollution, non-toxicity, and high safety. Its comprehensive performance can still be compared with solvent-based polyurethane. With the improvement of environmental requirements for industrial life and production, water-based polyurethane shows better performance in many coating finishing agents because it can significantly improve the coating's hardness, toughness, moisture resistance, and quality characteristics, such as Leather goods, wood, clothing, etc. in industrial life. Compared with solvent-based polyurethane, water-based ...

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