新型成炭剂的设计及其阻燃聚合物材料的热稳定性和燃烧性能的研究
[Abstract]:Nowadays, polymer materials are widely used in our daily life because of their excellent properties such as wear resistance, corrosion resistance, and electrical insulation. At the same time, they are well known for their flammability. The high flammability of polymer materials not only limits its further application and development, but also is extremely easy to fire and cause casualties and serious economic losses. Flame retardant technology and methods of common polymer materials (polypropylene and polybutylene terephthalate) are systematically reviewed in this paper. A series of phosphorus/nitrogen charring agents are prepared according to the molecular design, which have prominent char forming ability. These polymeric charring agents are used in flame retardant polypropylene materials. In addition, in order to solve the problem of poor water resistance of ammonium polyphosphate (APP), Microcapsulation Technology was introduced. Considering the advantages of nano-composite technology, a novel nano-composite flame retardant containing triazine polymerized charring agent (HCFAs) and stripped sodium-montmorillonite (Na-MMT) was prepared in one step. The thermal degradation and combustion characteristics of glass fiber reinforced polybutylene terephthalate (GFPBT) / HCFA / aluminum diethylene hypophosphite (AlPi) were studied. The main research progress of this paper includes the following parts. 1. A novel ring with high yield (86.5%) was synthesized by one-step method. Triphosphazene macromolecular charring agent (CPCFA) was introduced into polypropylene (PP) by melt blending with microcapsulated ammonium polyphosphate (MAPP) to prepare flame retardant PP. Compared with PP / MAPP, the LOI value of PP / MAPP / CPCFA system was obviously increased, and the vertical combustion (UL - 94) could reach V - 0 grade, and the corresponding thermal properties were also improved. The results show that the mixture of MAPP and CPCFA has a high flame retardant efficiency for PP. Thermogravimetric analysis shows that the presence of CPCFA can promote the formation of carbon layer and increase the residual carbon content of PP/MAPP/CPCFA in nitrogen and air. Finally, the water resistance test results show that the ratio of MAPP/CPCFA is 3:1 and 2:1. Polymer materials have excellent water resistance and can still reach UL-94 V-0 grade after 72 hours of hot water immersion. 2. In order to further improve the flame retardant efficiency and reduce its cost, a series of macromolecule charring agents based on triazine structure (HCFAs) were prepared and characterized by Fourier transform infrared spectroscopy (FTIR). Thermogravimetric analysis (TGA) and water solubility test were used to evaluate the thermal stability and water resistance of HCFAs. The corresponding experimental results show that HCFAs have excellent thermal stability, outstanding char-forming ability and excellent hydrophobicity, and can be used as an efficient charring agent. PA-HCFA containing triazine and piperazine rings exhibited the best thermal stability and char-forming ability among these macromolecular carbonizers. A new intumescent flame retardant (IFR) composed of HCFAs and ammonium polyphosphate (APP) was prepared for flame retardant PP composites. TGA, LOI and vertical combustion were used. The thermal degradation, combustion behavior and water resistance of PP/IFR system were evaluated by UL-94, Cone and water resistance tests. TGA results in nitrogen and air showed that HCFA/APP could increase the carbon residue and thermal stability of PP/IFR. LOI and Cone results showed that the addition of IFR (APP/HCFAs) significantly improved the thermal stability of PP/IFR system. The introduction of IFR (APP/HCFA) was found to be beneficial to the formation of an expansive and dense carbon layer on the surface of the material during combustion, thus effectively preventing further degradation and combustion of the internal substrate. As the most important component of intumescent flame retardant (IFR), acid-source ammonium polyphosphate (APP) was modified by cyanuric chloride and piperazine to improve its water resistance. The modified ammonium polyphosphate (CFA-APP) was obtained by FTIR, EA, X-ray photoelectron spectroscopy (XPS) and SEM. The flame retardant PP was prepared by melt blending of CFA-APP with carbon-collector, acid-source and gas-source. The flame retardant properties of PP, PP/APP and PP/CFA-APP were studied by LOI, UL-94 and cone calorimeter (CC). The LOI value of PP/CFA-APP system increased to 34.5% when the content of CFA-APP was 25%, and it could pass the V-0 test of vertical combustion. CC results showed that CFA-APP had better flame retardancy than APP in PP matrix, including lower PHR value, FGI and CO release. The thermal degradation behavior of PP composites was evaluated by thermogravimetric analysis. Compared with unmodified PP, the thermal stability of CFA-APP and PP composites could be improved effectively by using triazine macromolecule charring agent as shell layer. The shell layer promoted the decomposition of PP and CFA-APP in advance, resulting in better thermal stability at high temperature. The digital photographs and SEM diagrams show that the PP/CFA-APP composite has a more compact and stable carbon layer during combustion than PP/APP. It is concluded that chemical modification of APP is an effective method to improve the flame retardancy and water resistance of PP composites. 4. An organic modified montmorillonite (OMMT) was selected as a synergistic flame retardant to prepare PP/IFR/OMMT composites with ammonium polyphosphate (APP) and triazine macromolecule charring agent (PA-HCFA). The experimental results show that when the total content of IFR and OMMT is 20%, the flame retardancy of PP system is obviously improved. When the total amount of flame retardant is 20 wt%, the LOI value of PP system can be increased from 29% to 31.5% by adding 2 wt% OMMT. At the same time, the heat release rate (HRR), total heat release (THR) and the production of CO2 and CO were all reduced to some extent. The carbon layer of PP system was studied by SEM. It was found that the presence of OMMT could promote the formation of a dense and strong carbon layer on the surface of the polymer material during combustion, and at the same time insulate the heat and oxygen. TGA was used to investigate the thermal degradation behavior of PP and its synergistic flame retardant system. OMMT could improve the thermal stability of PP composites in high temperature region and the final carbon content of PP system. In addition, Na-MM with different content was successfully prepared. HCFA/Na-MMT nanocomposite flame retardant T. The nanocomposite flame retardant and ammonium polyphosphate (APP) were blended into polypropylene (PP) by melt blending to prepare flame retardant PP nanocomposites. In addition, LOI, UL-94 and One results show that when 20 wt% IFR is added (APP: HCFA / Na-MMT 2% = 3:1), the LOI value of PP / APP / HCFA / Na-MMT nanocomposites is the highest, reaching 31.5%. Vertical combustion test can pass V-0 grade. In addition, compared with PP / APP / HCFA without Na-MMT, the peak heat release rate of PP / APP / HCFA can reach 31.5%. The carbon slag of PP/APP/HCFA/Na-MMT2% nanocomposites exhibits an expanded honeycomb structure, which can effectively insulate heat and oxygen and prevent the release of combustible gases. 5. In Chapter 3, HCFA shows outstanding char-forming ability and good thermal stability, especially 1% weight loss of PA-HCFA (T1% weight loss). Thermal decomposition temperature at 468 C is predicted to be suitable for some polymer materials with higher processing temperature. Therefore, in this chapter, we choose PA-HCFA and AlPi to prepare flame retardant glass fiber reinforced PBT composites. In addition, the flame retardancy of GFPBT/AlPi/PA-HCFA composites was significantly improved. The combustion experiment results showed that the highest LOI value was obtained in the GFPBT/AlPi/PA-HCFA (AlPi/PA-HCFA=3/1) system and the flame retardancy was improved by UL-94 V-0 grade. In addition, the HRR and THR values of GFPBT/AlPi/PA-HCFA composites (AlPi/PA-HCFA=3/1) were significantly lower than those of pure GFPBT. SEM test further confirmed that the existence of the compact carbon layer could be reduced. The flame retardancy of GFPBT/AlPi/PA-HCFA composites was improved by the transfer of combustible gases and heat during low combustion. The above studies show that PA-HCFA is very helpful to the practical application of polymer matrix.
【学位授予单位】:中国科学技术大学
【学位级别】:博士
【学位授予年份】:2017
【分类号】:TQ314.248
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