Microencapsulated ammonium polyphosphate by polyurethane with segment of dipentaerythritol and its application in flame retardant polypropylene

Shouwu Yu; Shujuan Xiao; Zewen Zhao; Xiaowen Huo; Junfu Wei

doi:10.1016/j.cjche.2019.04.023

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Microencapsulated ammonium polyphosphate by polyurethane with segment of dipentaerythritol and its application in flame retardant polypropylene

Materials and Product Engineering | Updated：2026-01-06

- Microencapsulated ammonium polyphosphate by polyurethane with segment of dipentaerythritol and its application in flame retardant polypropylene
- Chinese Journal of Chemical Engineering Vol. 27, Issue 7, Pages: 1735-1743(2019)
- Affiliations：
  
  1. School of Material Science and Engineering, Tianjin Polytechnic University,Tianjin,China,300387
  2. College of Materials Science and Engineering, North China University of Science and Technology,Tangshan,China,063009
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2019.04.023
  CLC：
- Published：2019
- Accepted：
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Shouwu Yu, Shujuan Xiao, Zewen Zhao, Xiaowen Huo, Junfu Wei. Microencapsulated ammonium polyphosphate by polyurethane with segment of dipentaerythritol and its application in flame retardant polypropylene[J]. Chinese Journal of Chemical Engineering, 2019, 27(7): 1735-1743.
DOI：

Shouwu Yu, Shujuan Xiao, Zewen Zhao, Xiaowen Huo, Junfu Wei. Microencapsulated ammonium polyphosphate by polyurethane with segment of dipentaerythritol and its application in flame retardant polypropylene[J]. Chinese Journal of Chemical Engineering, 2019, 27(7): 1735-1743. DOI： 10.1016/j.cjche.2019.04.023.

摘要

Abstract

Dipentaerythritol (DPER)

40-diphenylmethanediisocyanate (MDI) and melamine (MEL) are used as raw materials to microencapsulate ammonium polyphosphate (MAPP)

in situ

polymerization. The MAPP is characterized by Fourier transform infrared (FT-IR)

scanning electron microscopy (SEM)

transmission electron microscopy (TEM) and thermal gravimetric analysis (TGA). The results show that the coating operation can effectively improve water resistance of ammonium polyphosphate (APP)

and MAPP has higher residual rate than that of APP after combustion. The flame retardant action of MAPP and APP in polypropylene (PP) is investigated by the limited oxygen index (LOI)

vertical burning test (UL-94)

TGA

SEM

and cone calorimeter test (CCT). The LOI value of the PP/MAPP composite at the same loading is higher than that of PP/APP composite. UL 94 ratings of PP/MAPP composites are raised to V-0 at 20 wt% loading. The results of CCT also show that MAPP is more efficient than APP. The morphological structures observed by digital photos and SEM demonstrated that MAPP could be promoted to form the continuous and compact intumescent char layer. The flame ret

ardant mechanism of PP/MAPP is also discussed.

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