Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (11): 104-112.doi: 10.13475/j.fzxb.20211106809

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation and application of polyphosphazene modified zeolite imidazolate framework materials for flame retardancy of poly(ethylene terephthalate)

LI Baojie1,2, ZHU Yuanzhao1,2, ZHONG Yi1,2,3, XU Hong1,2,3, MAO Zhiping1,2,3()   

  1. 1. Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Donghua University, Shanghai 201620, China
    2. College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China
    3. Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China
  • Received:2021-11-12 Revised:2022-07-22 Online:2022-11-15 Published:2022-12-26
  • Contact: MAO Zhiping E-mail:zhpmao@dhu.edu.cn

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Abstract:

In order to improve the flame retardancy of poly (ethylene terephthalate) (PET), a zeolite imidazolate framework material (ZIF-8) was fabricated from zinc nitrate hexahydrate and 2-methylimidazole. The surface of ZIF-8 were modified with hexachlorocyclotriphosphazene and 4,4-dihydroxydiphenylsulfone to synthesize a ZIF-8/PZS submicron particle. PET flame-retardant composites were prepared by melt blending with PET and their flame-retardant properties were investigated. Thermogravimetric analyzer, limiting oxygen index meter, vertical combustion meter, material testing machine and scanning electron microscope were used to analyze the thermal stability, flame retardancy, melt-dripping resistance, mechanical properties and flame-retardant mechanism of composite materials. The results show that the addition of 6% ZIF-8/PZS submicron particles increases the LOI value of PET to 29.2% and passes UL-94 V-0 level. The mechanical properties of the composite materials are not severely affected. ZIF-8/PZS can be effective in both the gas phase and the condensed phase, thereby giving PET composites excellent flame-retardant properties.

Key words: submicron particles, flame retardant fiber, anti-dripping, melt blending, poly (ethylene terephthalate), zeolite imidazolate framework materials

CLC Number: 

  • TS195.2

Fig.1

Synthetic route of ZIF-8/PZS submicron particles"

Tab.1

Formulation of different sample"

样品
编号		 ZIF-8
质量/g		 PZS
质量/g		 ZIF-8/PZS
质量/g		 PET
质量/g		 总质量/
g
1# — — — 100 100
2# 3 — — 97 100
3# — 3 — 97 100
4# — — 3 97 100
5# — — 6 94 100
6# — — 9 91 100

Fig.2

SEM images of ZIF-8 and ZIF-8/PZS"

Fig.3

XRD pattern of ZIF-8(a), FT-IR spectra of ZIF-8 and ZIF-8/PZS(b)"

Fig.4

TGA curves of ZIF-8 and ZIF-8/PZS"

Fig.5

TGA (a) and DTG (b) curves of PET and PET flame retardant composites under nitrogen"

Tab.2

TGA and DTG data of PET and its flame retardant composites"

样品编号 T-5%/
℃		 Tmax/
℃		 800 ℃残炭率/
%		 最大分解速率/
(%·min-1)
1# 391 437 9.4 19.8
2# 343 418 14.2 17.9
3# 331 405 12.1 15.8
4# 339 421 15.3 15.3
5# 336 403 16.1 13.4
6# 335 416 16.4 13.9

Tab.3

LOI and vertical burning data of PET and its flame retardant composites"

样品编号 LOI值/% 垂直燃烧实验
UL94等级 熔滴 点燃脱脂棉
1# 23.1±0.1 V-2 严重 是
2# 26.0±0.1 V-1 缓慢 否
3# 25.5±0.1 V-1 严重 否
4# 27.3±0.1 V-0 很少 否
5# 29.2±0.1 V-0 很少 否
6# 30.6±0.1 V-0 很少 否

Fig.6

Heat release rate (a) and total heat release (b) versus time curves"

Fig.7

Curves of absorption intensity of pyrolysis products versus time. (a) CO2; (b) Benzoicaid; (c) Aromatic compound"

Fig.8

Images of char residues of 1# and 5# samples"

Fig.9

Raman spectra of char residues from 1# and 5#"

Tab.4

Contents of related elements in 5# sample and char residue"

样品 元素含量/(mg·g-1)
C N P Zn
5# 61.56 3.18 2.42 12.05
5#残炭 86.52 1.20 13.36 79.75

Fig.10

Tensile strength(a),elongation at break(b) and tensile modulus(c) of PET and PET flame retardant composite materials"

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