Lignin demethylation for modifying halloysite nanotubes towards robust phenolic foams with excellent thermal insulation and flame retardancy

2021 ◽  
pp. 52019
Author(s):  
Ming Li ◽  
Junqiang Shan ◽  
Youqin Hu ◽  
Cheng Gao ◽  
Haoyu Long ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Flame Retardancy ◽  
Halloysite Nanotubes

scholarly journals The Effect of Halloysite Nanotubes on the Fire Retardancy Properties of Partially Biobased Polyamide 610

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3050
Author(s):  
David Marset ◽  
Celia Dolza ◽  
Eduardo Fages ◽  
Eloi Gonga ◽  
Oscar Gutiérrez ◽  
...  
Keyword(s):  
Optical Density ◽  
Flame Retardancy ◽  
Ignition Time ◽  
Characteristic Curve ◽  
Halloysite Nanotubes ◽  
Inorganic Filler ◽  
Standard Samples ◽  
Start Time ◽  
Twin Screw ◽  
Heat Released

The main objective of the work reported here was the analysis and evaluation of halloysite nanotubes (HNTs) as natural flame retardancy filler in partially biobased polyamide 610 (PA610), with 63% of carbon from natural sources. HNTs are naturally occurring clays with a nanotube-like shape. PA610 compounds containing 10%, 20%, and 30% HNT were obtained in a twin-screw co-rotating extruder. The resulting blends were injection molded to create standard samples for fire testing. The incorporation of the HNTs in the PA610 matrix leads to a reduction both in the optical density and a significant reduction in the number of toxic gases emitted during combustion. This improvement in fire properties is relevant in applications where fire safety is required. With regard to calorimetric cone results, the incorporation of 30% HNTs achieved a significant reduction in terms of the peak values obtained of the heat released rate (HRR), changing from 743 kW/m2 to about 580 kW/m2 and directly modifying the shape of the characteristic curve. This improvement in the heat released has produced a delay in the mass transfer of the volatile decomposition products, which are entrapped inside the HNTs’ lumen, making it difficult for the sample to burn. However, in relation to the ignition time of the samples (TTI), the incorporation of HNTs reduces the ignition start time about 20 s. The results indicate that it is possible to obtain polymer formulations with a high renewable content such as PA610, and a natural occurring inorganic filler in the form of a nanotube, i.e., HNTs, with good flame retardancy properties in terms of toxicity, optical density and UL94 test.

Study and Application of Plastic Construction Materials

2011 ◽  
Vol 99-100 ◽  
pp. 1117-1120 ◽  
Author(s):  
Mao Quan Xue
Keyword(s):  
Thermal Conductivity ◽  
Corrosion Resistance ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Flame Retardancy ◽  
Building Materials ◽  
Construction Materials ◽  
Low Thermal Conductivity ◽  
Building Walls

As new building materials, plastic has light weigh, corrosion resistance, low thermal conductivity, thermal insulation, waterproof, energy-saving, molding convenient, high recycling characteristic, widely used in building materials. According to the research of improving its flame retardancy, strength, thermal insulation, waterproof properties, the application of plastic use in doors and windows, pipeline, building walls and roofs of buildings, etc. were reviewed, and the developing direction was discussed.

scholarly journals Enhanced Thermal Insulation and Flame-Retardant Properties of Polyvinyl Alcohol-Based Aerogels Composited with Ammonium Polyphosphate and Chitosan

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
MinYi Luo ◽  
Jiayou Xu ◽  
Shu Lv ◽  
XueFeng Yuan ◽  
Xiaolan Liang
Keyword(s):  
Polyvinyl Alcohol ◽  
Heat Release ◽  
Flame Retardant ◽  
Thermal Insulation ◽  
Heat Release Rate ◽  
Flame Retardancy ◽  
Release Rate ◽  
Ammonium Polyphosphate ◽  
Composite Aerogel ◽  
Composite Aerogels

Polyvinyl alcohol- (PVA-) based aerogels have attracted widespread attention owing to their low cost, eco-friendliness, and low density. However, the applications of PVA-based aerogels are limited by their flammability. In this study, a flame retardant, ammonium polyphosphate (APP), and a biopolymer, chitosan (CS), were added to polyvinyl alcohol (PVA), and the polymer was further crosslinked using boric acid (H3BO3). In the PVA aerogels, the negatively charged APP and positively charged CS formed a polyelectrolyte complex (PEC) through ionic interaction. Cone calorimetry and vertical burning tests (UL-94) indicated that the PVA composite aerogels have excellent flame retardancy; they could decrease the heat release rate, total heat release rate, and carbon dioxide (CO2) generation. Both PVA/H3BO3 and APP-CS in the composite aerogel could be burned to carbon, and the foamed char layer could act together to impart the PVA composite aerogels with good flame retardancy. Further, the decrease in the temperature at the backside of the aerogels with increasing APP-CS content, as determined by the flame-spraying experiment, indicated that the PVA-based aerogels with APP-CS can also serve as thermal insulation materials. This work provides an effective and promising method for the preparation of PVA-based aerogels with good flame retardancy and thermal insulation property for construction materials.

scholarly journals Influence of Organoclay on the Flame Retardancy and Thermal Insulation Property of Expandable Graphite/Polyurethane Foam

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Nhung Hac Thi ◽  
Duy Linh Pham ◽  
Nguyen Thi Hanh ◽  
Ho Thi Oanh ◽  
Thi Hai Yen Duong ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Thermal Insulation ◽  
Flame Retardancy ◽  
Polyurethane Foams ◽  
Expandable Graphite ◽  
Insulation Property ◽  
Limiting Oxygen Index ◽  
Thermal Insulation Property ◽  
The One ◽  
Polyurethane Composites

The rigid polyurethane foams (RPUFs) filled with organoclay cloisite 20A and expandable graphite (EG) were prepared by the one-step expanding foam method. Flame behavior, mechanical properties, and thermal conductivity of the composites were investigated. The vertical burning test (UL-94V) and limiting oxygen index (LOI) showed that the flame retardancy was increased proportionally with the content of EG in PU composite. However, the presence of EG filler impaired the thermal insulation and the compressive strength of the composite. In this report, we proved that organoclay could improve the compressive strength, thermal insulation, and flame retardancy of EG/polyurethane composites. This work can contribute to the development of environment-friendly flame-retardant products for green growth.

Dehulled coffee husk-based biocomposites for green building materials

2019 ◽  
pp. 089270571987630 ◽  
Author(s):  
Manikandan Ilangovan ◽  
Vijaykumar Guna ◽  
Chunyan Hu ◽  
Akio Takemura ◽  
Zulkiflle Leman ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Flame Retardancy ◽  
Sound Absorption ◽  
Building Materials ◽  
Green Building ◽  
Water Stability ◽  
Coffee Husk ◽  
Acceptable Range ◽  
Green Building Materials ◽  
Pp Composites

In this work, coffee husk (CH) was used as a reinforcement for polypropylene (PP) to fabricate bio-based composites by compression molding. The effects of three different ratios of CH/PP (70:30, 80:20, 90:10 wt%/wt%) and densities (0.5, 0.75, and 1.0 g cm−3) on the mechanical properties, flame retardancy, water stability, sound, and thermal insulation were studied. Results revealed that the 1.0 g cm−3 composite at 80:20 ratio had the highest tensile and flexural strength (24.5 and 21.5 MPa, respectively). With increase in density, the water stability and flame retardancy of the composites improved. The 1.0 g cm−3 80:20 ratio CH/PP composites had the highest sound absorption coefficient of 0.9 and thermal insulation coefficient of 51.8 mW mK−1, which is within the acceptable range of standards for insulation materials according to TS 805 EN 601 standards. CH/PP composites exhibit favorable properties to be used in false ceiling and insulation panels.

Sign in / Sign up

Export Citation Format

Share Document