Intumescent type multifunctional fire retardant coating containing nano-graphite sheets

Abstract

The invention discloses an intumescent type multifunctional fire retardant coating containing nano-graphite sheets. The fire retardant coating comprises a base material, the functional nano-graphite sheets and intumescent flame retardant. The functional nano-graphite sheets include hydroxyl, carboxyl, carbonyl, epoxy groups, sulfenyl and / or amino after being treated. The mass fraction of the functional nano-graphite sheets is 0.5%-10%. According to the fire retardant coating, the nano-graphite sheets are functionalized so as to obtain various polar functional groups, the nano-graphite sheets can be dispersed in the base material, the intumescent flame retardant and solvent of the fire retardant coating so that the coating can be better prepared, and accordingly the intumescent type multifunctional fire retardant coating containing the nano-graphite sheets is formed. The fire resistance is greatly improved; moreover, various functions of electric conduction, heat dissipation, corrosion prevention and the like are achieved, and the effect is quite good.

Description

technical field [0001] The invention relates to a fireproof coating, in particular to an expansive fireproof coating containing nano-graphite flakes. Background technique [0002] The intumescent fireproof coating is coated on the surface of flammable base materials such as building materials. Once a fire breaks out, it will expand violently at high temperature to form a foam insulation layer. The thickness can be dozens of times the thickness of the original coating, which can effectively block the outside The heating effect of the heat source on the base material prevents the combustion from continuing to spread. Therefore, intumescent fireproof coatings are widely used in fields with high fireproof requirements at this stage. [0003] However, there are still many problems in the existing intumescent fireproof coatings. [0004] 1. The expansion system of intumescent fire retardant coatings usually includes carbon source, acid source and gas source. Generally, ammonium ...

AI Technical Summary

Problems solved by technology

[0004] 1. The expansion system of intumescent fire retardant coatings usually includes carbon source, acid source and gas source. Generally, ammonium polyphosphate APP of type II crystal is used as the acid source. Although compared with other crystal forms, the water absorption has been greatly improved. However, it still fails to achieve satisfactory conditions, especially in harsh environments, which is easy to clear out, and the expansion conditions are lost.

[0005] 2. Intumescent fire-resistant coatings on the market have fire-resistant conditions, but for anti-corrosion, the anti-corrosion project must be applied before the construction of the fire-resistant coating. In addition to the problem of the coating engineering interface, it also forms the load of multiple constructions

[0006] 3. Due to the expansion system of intumescent fireproof coatings, most of them are in the form of powder, and the addition ratio is very large; if you add other indispensable pigments and fillers and carbon foam layer enhancer components, since they are all in the form of powder, The color-to-base ratio is high, so the durability is poor, and special attention must be paid to the safety of maintenance and recoating operations

However, the thickness of organic coatings can only be 0.3-0.5mm each time, resulting in multiple constructions, long construction periods, and difficult quality control

[0008] 5. The fire is random, but in the normal and safe operation, if only the fire protection is established, it is easy to lose other protection benefits, such as: lightning protection, anti-corrosion, anti-fouling, etc.

As a result, it created a dilemma

[0009] 6. The initial temperature of expansion is high, and the fire resistance is not strong enough

Especially for hydrocarbon fires, the high temperature can reach more than 1,000 degrees instantaneously, and the existing intumescent fireproof materials cannot meet the requirements of long-term resistance to hydrocarbon fires

In addition, for fields with special requirements such as corrosion resistance and antistatic occasions, the existing intumescent fireproof coatings cannot meet the above requirements at the same time or the effect is poor