A kind of graphene oxide modified water-based polyurethane thermally conductive flame retardant antistatic coating film forming agent and preparation method thereof

Abstract

A graphene oxide modified water-based polyurethane heat-conducting flame-retardant antistatic coating film-forming agent and a preparation method thereof. First, a graphene oxide dispersion with few layers and low oxidation degree was prepared by wet grinding oxidation method. The obtained graphene oxide has good thermal conductivity, flame retardancy and electrical conductivity, and then the hydroxyl-terminated hyperbranched polyester is used to react with graphene oxide. Prepare hyperbranched graphene oxide with terminal hydroxyl groups, and react it with polyurethane prepolymer to prepare water-based polyurethane heat-conducting, flame-retardant and antistatic coating film-forming agent. 29% to 33%, volume resistivity 5.6ⅹ10 ‑2 ~8.7ⅹ10 ‑2 Ω·m and surface resistivity are 6.82~8.45Ω·m, and the working temperature reaches 190~200℃. The coating film-forming agent prepared by the invention can be widely used in the coating of radiators, radiators, lighting equipment, engines, electronic devices and the like. The preparation method of the invention has the advantages of easy acquisition of materials, reasonable process route, convenient operation, no pollution in the preparation process, low price and the like.

Description

technical field [0001] The invention belongs to the field of fine chemicals and functional polymer materials, and in particular relates to a graphene oxide modified water-based polyurethane heat-conducting flame-retardant antistatic coating film-forming agent and a preparation method thereof. [0002] technical background [0003] The full name of polyurethane is polyurethane, which is a kind of polymer compound. Because polyurethane has excellent mechanical properties and good chemical resistance, acid and alkali resistance, weather resistance, water resistance, high adhesion and other properties, it has been widely used, such as its application as polyurethane coating. Polyurethane is divided into solvent-based polyurethane and water-based polyurethane. Due to the pollution of solvent-based polyurethane coatings, its application is currently limited. Compared with solvent-based polyurethane coatings, water-based polyurethane coatings are environmentally friendly coatings wi...

AI Technical Summary

Problems solved by technology

Functional waterborne polyurethane coatings, such as thermal conductivity, electrical conductivity, flame retardancy and corrosion resistance, etc., need to be modified by adding different fillers such as thermal conductivity, conductivity, flame retardancy and corrosion resistance. In the current waterborne polyurethane modification method There are the following problems: (1) Different functions such as thermal conductivity, electrical conductivity, flame retardancy, antistatic and anti-corrosion of water-based polyurethane need to add different fillers, and the preparation process and process are also different, so it is difficult to prepare these multiple polyurethanes at the same time. Functional coatings; (2) By adding thermal conductivity, electrical conductivity, flame retardant, antistatic and anti-corrosion additives to prepare functional waterborne polyurethane coatings, the filler content is large, which can reach about 20% to 40% of the total mass of the coating, causing The overall performance of the coating is reduced, which also makes the preparation cost higher

(3) Through conventional preparation methods, it is difficult to achieve comprehensive properties such as thermal conductivity, flame retardancy, antistatic, good mechanical strength, and strong adhesion for waterborne polyurethane coatings.

However, the six-membered ring regular crystal structure in graphene oxide is easily destroyed, resulting in a decrease in its thermal and electrical conductivity.

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