The physicochemical and fire extinguishing performance of aqueous film‐forming foams based on a class of short‐chain fluorinated surfactants

2021 ◽  
Author(s):  
Xinhua Zhu ◽  
Xuhong Jia ◽  
Yuqiang Zhang
Keyword(s):  
Short Chain ◽  
Fluorinated Surfactants ◽  
Fire Extinguishing ◽  
Film Forming

scholarly journals Study on Flame Retardancy and Mechanism of Talc Composite Foams

2021 ◽  
Vol 8 ◽  
Author(s):  
Xiujuan Li ◽  
Ruisong Guo ◽  
Xiaodong Qian
Keyword(s):  
High Temperature ◽  
Fire Resistance ◽  
Flame Retardancy ◽  
Dense Layer ◽  
Composite Foam ◽  
Fire Extinguishing ◽  
Fuel Burning ◽  
Composite Foams ◽  
Film Forming ◽  
Improved Stability

Under high temperature, aqueous film forming foam extinguishing agent has poor flame retardancy and low fire efficiency. In order to solve this problem, talc was introduced into foam to form composite foam. The fire resistance and fire extinguishing properties of the composite foam were studied. The results showed that talc composite foam had good flame retardant resistance. when the concentration of talc reached 40 g/100 ml, the 50% liquid separation time of the composite foam was 21.1 min. The fuel burning in the anti burning tank did not ignite the gasoline in the oil pan, and burned out at 51.5 min. It was related to the structure of composite foam and the properties of talc. Due to the introduction of talc, the viscosity of the composite foam increased. The network structure of composite foam was important to the improved stability of foam. Talc powder formed a dense layer covering the oil surface, which effectively isolated the oil from the air.

Research of Film-Forming and Insulating Ability of Solutions of Fluorinated Surfactants

2011 ◽  
Vol 20 (5) ◽  
pp. 25-35
Author(s):  
S.G. Kotov ◽  
◽  
O.D. Navrotsky ◽  
D.S. Kotov ◽  
◽  
...  
Keyword(s):  
Fluorinated Surfactants ◽  
Film Forming

scholarly journals Synthesis of short-chain passivated carbon quantum dots as the light emitting layer towards electroluminescence

RSC Advances ◽  
2017 ◽  
Vol 7 (46) ◽  
pp. 28754-28762 ◽  
Author(s):  
Yuanfei Ding ◽  
Feng Zhang ◽  
Jiacong Xu ◽  
Yanqin Miao ◽  
Yongzhen Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Carbon Quantum Dots ◽  
Short Chain ◽  
Light Emitting ◽  
Structure Characteristics ◽  
Film Forming

S-CQDs were chosen as a light emitting layer by virtue of their structure characteristics, optical properties and film-forming ability to obtain CQD-LEDs.

Nonionic Short-Chain Fluorinated Surfactants in the Fatliquoring of Chrome-Tanned Goat Skin

2020 ◽  
Vol 115 (7) ◽  
pp. 255-262
Author(s):  
Yichao Shen ◽  
Yong Jin ◽  
Shuangquan Lai ◽  
Liangjie Shi ◽  
Yutang Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Repellency ◽  
Short Chain ◽  
Fiber Morphology ◽  
Leather Industry ◽  
Fluorinated Surfactants ◽  
Surface Activities ◽  
Goat Skin ◽  
Measurement Results ◽  
Almost All

Surfactants as essential auxiliaries are used in almost all chemical processes in leather production. In this work, a series of nonionic short-chain fluorinated surfactants (Fn-Fn, where n = 2, 4, or 6) were successfully prepared and used as fatliquoring auxiliaries in the fatliquoring process of chrome-tanned goat skin. The chemical structure of these nonionic short-chain fluorinated surfactants was characterized by FTIR and the molecular weight was determined by GPC. The surface tension measurement results revealed that these three fluorinated surfactants showed excellent surface activities. The effect of type and dosage of Fn-Fn as well as fatliquoring temperature on fatliquoring properties of chrome-tanned goat skin were estimated by the softness and physical mechanical properties characteristic of resultant leather. The results revealed that the leather treated with 1 wt% F4-F4 at the fatliquoring temperature of 40oC showed the best overall performance, whose softness and physical mechanical properties were improved significantly. Moreover, the collagen fiber morphology and waterproof performance of leather treated with Fn-Fn were also investigated which showed that the addition of Fn-Fn in the fatliquoring process could promote the loosening of collagen fibers while effectively enhancing the water repellency of the leather surface. Therefore, such types of nonionic short-chain fluorinated surfactants are promising to be as desired fatliquoring auxiliaries in the leather industry.

scholarly journals Preparation and Absorption Carbon Monoxide Properties of a Novel Flame Retardants Based Fire-Fighting Foam

2021 ◽  
Vol 8 ◽  
Author(s):  
Xiujuan Li ◽  
Ruisong Guo ◽  
Xiaodong Qian
Keyword(s):  
Carbon Monoxide ◽  
Flame Retardant ◽  
Magnesium Hydroxide ◽  
Flue Gas ◽  
Flame Retardants ◽  
Water Soluble ◽  
Gas Temperature ◽  
Fire Extinguishing ◽  
Film Forming ◽  
Co Concentration

The toxicity of CO threatens the life of people in the fire site. In this study, flame retardants of nano magnesium hydroxide particles and water-soluble flame retardant 8124 are used to be mixed into the aqueous film forming fire extinguishing agent (AFFF). Smoke-suppressed fire extinguishing agent was prepared in Waring-Blender mixing cup and then stirred at 3,000 r/min for 5 min. The new extinguishing agent shows a good performance of absorption of CO and reducing the flue gas temperature. The concentration of CO was decreased below 131 ppm and flue gas temperature was basically kept below 40°C, which was 367 ppm and 83.1°C less than that in free-fire. Using new extinguishing agent can effectively reduce the harm to the trapped personnel and firemen in the fire site. It was of great significance. The harm of CO concentration below 131 ppm and flue gas temperature below 40°C was low. The time to reach the maximum CO concentration and the maximum flue gas temperature was delayed, which ensures that people have more time to escape. Even if there was not enough time to escape, people will not be seriously threatened.

scholarly journals Fire-extinguishing efficiency and environmental performance of foam for extinguishing a warehouse space with oil

2019 ◽  
Vol 135 ◽  
pp. 01008 ◽  
Author(s):  
Evgeniy Degaev
Keyword(s):  
Petroleum Product ◽  
Environmental Performance ◽  
Hydrocarbon Flames ◽  
Foaming Agent ◽  
Blowing Agents ◽  
Fire Extinguishing ◽  
Fuel Layer ◽  
Film Forming

This article analyzes the fire extinguishing efficiency of hydrocarbon and fluorinated film-forming foaming agent. It was revealed that fluorinated blowing agents have a number of significant advantages over hydrocarbon. The main ones are: ensuring inertness when feeding from foam of various heights and distances, long-term prevention of reignition, extinguished petroleum product, the possibility of extinguishing hydrocarbon flames by supplying foam to the base of the tank, directly into the fuel layer.

Identification of Novel Fluorinated Surfactants in Aqueous Film Forming Foams and Commercial Surfactant Concentrates

2013 ◽  
Vol 48 (1) ◽  
pp. 121-129 ◽  
Author(s):  
Lisa A. D’Agostino ◽  
Scott A. Mabury
Keyword(s):  
Fluorinated Surfactants ◽  
Film Forming

scholarly journals Fire-extinguishing performance and mechanism of aqueous film-forming foam in diesel pool fire

2020 ◽  
Vol 17 ◽  
pp. 100578 ◽  
Author(s):  
Zhisheng Xu ◽  
Xing Guo ◽  
Long Yan ◽  
Wendong Kang
Keyword(s):  
Pool Fire ◽  
Fire Extinguishing ◽  
Film Forming ◽  
Performance And Mechanism

A class of efficient short-chain fluorinated catanionic surfactants

2016 ◽  
Vol 18 (5) ◽  
pp. 1234-1239 ◽  
Author(s):  
P. Verdia ◽  
H. Q. N. Gunaratne ◽  
T. Y. Goh ◽  
J. Jacquemin ◽  
M. Blesic
Keyword(s):  
Environmental Impact ◽  
Surface Activity ◽  
Short Chain ◽  
Fluorinated Surfactants ◽  
Catanionic Surfactants

A family of short-chain catanionic fluorinated surfactants with potential for reduced environmental impact, excellent surface activity and fluorine efficiency.

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