Ammonium polyphosphate (APP) is an effective flame retardant in thermoplastic polyurethane (TPU). In order to further enhance the flame retardant efficiency of APP, it was coated with graphene oxide (GO) and melamine formaldehyde (MF) successively, by using 5 wt% end product of MF‐GO@APP in TPU, the sample produced little dripping during burning and reached UL‐94V‐0 grade, peak smoke production rate was reduced from 0.132 m2/s in TPU to 0.051 m2/s, that was 61.4% decrease. Neat TPU burned out with little residue left, but by the help of 5 wt% MF‐GO@APP, 24.4 wt% of char was left. These results were tried to be analyzed as relative higher heat conductivity of GO, in heating GO transferred more heat to APP and MF, resulting in earlier degradation of APP and MF, the decomposed product of MF and APP cross‐linked together to form more compact char above substrate. MF‐GO@APP acted as an integrated intumescent flame retardant.
This work deals with the synthesis of new melamine superplasticizer (NMS) with high molecule weight and comparatively high processing thermostability by the reaction among melamine, formaldehyde, and sulfonated glucose. The surface activity and the structure of new melamine superplasticizer and their performance in concrete were evaluated. The effect of molecular weight of synthesized new melamine superplasticizer on the performance of the concrete was determined. The results showed that the new melamine superplasticizer has been proved to be more efficient as a superplasticizer used in concrete.
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