Preparation method of interpenetrating-network-structure water-based polyurethane nano composite material

Abstract

The invention provides a preparation method of an interpenetrating-network-structure water-based polyurethane nano composite material. The preparation method comprises the following steps: 1) carrying out vacuum dehydration treatment on polymer polylol and hydrophilic functional monomer; 2) adding a catalyst and diisocyanate, reacting at room temperature for 0.5-2 hours, heating to 60-80 DEG C, and carrying out the reaction for 1-5 hours while keeping the temperature; 3) cooling to 40-50 DEG C, adding a chain extender, and carrying out the reaction for 2-4 hours while keeping the temperature; 4) heating to 60-70 DEG C, and adding a reactive monomer for termination; 5) cooling to 30-50 DEG C, and adding a neutralizer to regulate the pH value; 6) heating to 60 DEG C, dropwise adding deionized water, and dispersing by stirring; and 7) heating to 60-65 DEG C, dropwise adding an initiator water solution and a nucleation monomer, carrying out programmed heating, and carrying out the reaction while keeping the temperature, thereby obtaining the interpenetrating-network-structure water-based polyurethane nano composite material. The method effectively solves the problem of VOC (volatile organic compound) discharge. The nano composite material has the characteristics in both the core-shell structure and the interpenetrating network structure, and thus, has favorable mechanical properties. The adopted continuous-process synthesis technique is beneficial to enhancing the production efficiency.

Description

technical field [0001] The invention belongs to the field of new polymer materials, and in particular relates to a preparation method of an interpenetrating network structure waterborne polyurethane nanocomposite material. Background technique [0002] The current global environmental pollution is already very serious, and it is urgent to save energy and reduce emissions while promoting economic development. The European Union and the United States have set strict limits on the emission of volatile organic compounds (VOC) from coatings / inks. my country has imposed consumption taxes on solvent-based coatings since 2015, which has promoted the transformation and upgrading of the industry. Therefore, the design and synthesis of environmentally friendly water-based coatings / inks / adhesives and their resins with novel structures and the innovation of synthesis methods are of great significance. [0003] As a kind of widely used polymer material, waterborne polyurethane has a hi...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of interpenetrating network structure water-based polyurethane nanocomposite, which mainly solves the existing deficiencies in the existing water-based polyurethane coating / ink / adhesive: invented a solvent-free method for synthesizing water-based polyurethane resin , which effectively solves the VOC emission problem caused by the acetone method, and avoids the problem that the solvent-based polyurethane system pollutes the environment due to a large amount of organic solvents, affects health, and causes high production costs; the molecular design introduces an interpenetrating network structure, making The material has better film-forming properties, and the film-forming has good wear resistance and scratch resistance and high mechanical strength; at the same time, a method for synthesizing or producing water-based polyurethane by continuous method is invented, which effectively solves the complexities of batch method Process problems improve production efficiency; the invention also solves the problems of poor temperature resistance, low hardness, and low bonding strength of the existing water-based polyurethane system after film formation

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