Swelling ratio of epoxy polymers filled with systems based on ammonium polyphosphate

Оlexander Hryhorenko

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0003-4629-1010

Yevgeniiy Zolkina

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0003-2562-2546

Danchenko Danchenko

National Academy of the National Guard of Ukraine

http://orcid.org/0000-0003-3865-2496

DOI: https://doi.org/10.52363/2524-0226-2022-36-6

Keywords: epoxy polymer, flame retardant coating, expand multiplication, mathematical model

Аnnotation

The multiplicity of expanding of the coke layer of epoxy polymers filled with ammonium polyphosphate and target fillers was investigated. Compositions based on an epoxy film former, hardened with polyethylene polyamine, were used as the object of the study. The target fillers are pentaerythritol and thermally expandable graphite as an additional carbon source, aluminum hydroxide as a gas generator, and aerosil as a thickener. The research was conducted according to the theory of planning experiments with the construction of second-order orthogonal compositional plans. The linear coefficient of expanding K_L was chosen as the response function. Mathematical models were obtained that adequately describe the dependence of the linear coefficient of expanding on the content of components for the three studied systems. It was established that the joint introduction into the polymer matrix of two carbon sources, pentaerythritol and heat-expandable graphite, gives a positive effect in comparison with compositions filled with ammonium polyphosphate with pentaerythrite and ammonium polyphosphate with heat-expandable graphite separately (by 77 % and 45 %, respectively). It was established that the maximum value of the linear coefficient of expanding (K_L2=66) among the studied systems is achieved in the system filled with ammonium polyphosphate, aluminum hydroxide and thermally expanding graphite with the following ratio of components: ammonium polyphosphate – within 20–22 parts of mass, aluminum hydroxide –15 parts of mass, thermally expandable graphite – within 2,5–3,5 parts of mass, which is 10% more than this indicator for the epoxy polymer filled only with ammonium polyphosphate in the amount of 30 parts of mass. The expediency of using aluminum hydroxide as part of the composition is shown. It was established that the system is filled with ammonium polyphosphate, aluminum hydroxide and aerosol with the content of ammonium polyphosphate components in the range of 23–27 parts of mass, aluminum hydroxide 25 parts of mass and Aerosil 1 parts of mass allows you to get a coating with a linear coefficient of expanding K_L3=58.

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