Please wait.'

Page is loading'


Home  > Raw materials & technologies  > Raw materials  > Coatings binders  > Making flame retardants in epoxy coatings...

Tuesday, 24 September 2019
pdf
Raw materials & technologies, Raw materials, Coatings binders

Making flame retardants in epoxy coatings more effective

Tuesday, 28 May 2013

A simple and efficient preparation method of organic-inorganic hybrids flame retardants was found and the in situ sol-gel process was the basis.

Incorporated reduced graphite oxide leads to more efficiency of the flame retardant

Source: Fotolia/Salmon

Incorporated reduced graphite oxide leads to more efficiency of the flame retardant

Source: Fotolia/Salmon

Lei Song from University of Science and Technology of China and his colleagues incorporated reduced graphite oxide (rGO) into the flame retardants matrix by in situ sol–gel process. This resulted in the formation of organic–inorganic hybrids flame retardants containing exfoliated rGO.

The TEM results of organic–inorganic hybrids flame retardants (FRs-rGO) hybrids revealed that the rGO was previously exfoliated in the phosphorus and silicon containing FRs.

Char residues increased, Tg shifted to higher temperature

Subsequently, the researchers incorporated the flame retardant into epoxy resins (EP). The previous exfoliation of rGO in the FRs allows rGO to be intimately mixed with epoxy resins,  confirmed by the TEM results of FRs-rGO/EP nanocomposites.

With the incorporation of 5 wt% of FRs-rGO into EP, satisfied flame retardant grade (V0) and the LOI as high as 29.5 were obtained. The char residues of the FRs-rGO/EP nanocomposites were significantly increased in air as well as nitrogen atmosphere. Moreover, the peak heat release rate (pHRR) value of FRs-rGO/EP was significantly reduced by 35 %, and the glass transition temperature (Tg) of FRs-rGO/EP nanocomposites shifted to higher temperature, compared to those of neat EP.

Results show high flame retardant efficiency

The flame retardancy strategy of FRs-rGO combines condensed phase and gas phase flame retardant strategies such as the nanocomposites technique, phosphorus–silicon synergism systems in the condensed phase and DOPO flame retardant systems in the gas phase. Moreover, the flame retardants containing exfoliated graphene (FRs-rGO) provided a novel method to prepare organic–inorganic hybrids flame retardants and the as-prepared flame retardants exhibited high flame retardant efficiency.

top of page
Comments (0)
Add Comment

Post comment

You are not logged in

register