Contribution of nanoclays to the performance of traditional flame retardants in ABS

This article was published on Feb. 2, 2012 in Polymer composites.

Abstract

The purpose of this study was to investigate contribution of nanoclays to the flame retardancy performance of a traditional brominated flame retardant compound with various combinations of antimony trioxide and zinc borate. The matrix polymer acrylonitrile butadiene styrene (ABS) was compounded by melt mixing in a laboratory size twin-screw extruder. X-ray diffraction analysis and transmission electron microscopy revealed that nanoclay silicate layers were mainly intercalated with certain level of exfoliation in ABS matrix. Flammability analysis investigated by mass loss calorimeter, limiting oxygen index, and UL-94 tests indicated that use of nanoclays improved all flame retardancy parameters significantly. For instance, the increase in the limiting oxygen index was up to 32% O2, while the suppression in peak heat release rate value was as much as 82%, of course in each specimen the highest rating of V-0 in UL-94 test was obtained. Thermogravimetric and other residue analyses pointed out that these contributions were especially due to the condensed phase flame retardancy mechanism of nanoclay which contributes stronger and carbonaceous char formation acting as a barrier to heat and flammable gases and retarding volatilization via tortuous pathway.

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Clariant highlights cutting-edge additives in India

  • Clariant highlights its range of waxes, light stabilizers and flame retardants designed for quality performance, ease of processing and overall sustainability
  • Focus on innovative products: Licocene® waxes; Hostavin® 3330 disp. XP light stabilizer; and Exolit® AP flame retardant

 Mumbai (India), February 24, 2012 – At PaintIndia, Clariant will present its range of new and cutting-edge additives designed to reduce impact on the environment and provide reliable quality and product safety.

Ceridust®, Licowax® and Licocene® waxes
These waxes are incorporated in paints, coatings and ink to achieve or improve various properties, including sandability, smoothness, hand feel, anti-scratch and water repellency. The Ceridust grades are micropowders produced via a special process. They can be finely dispersed in paints of different systems, easily and with little mechanical energy.

Building on the company’s in-depth understanding of metallocene catalysts and renewables, Clariant has developed its new grade polymer, Licocene, to achieve better performance for the coating and ink industry.

Ceridust, Licowax and Licocene are virtually insoluble in water. Hence they are attacked only very slowly by microorganisms in water and cause no significant biological oxygen demand. They are eliminated from the effluent as ballast together with the sludge.

Light Stabilizers – Hostavin®

Clariant offers a comprehensive range of light stabilizers for the protection of paints and coatings, covering both solvent- and waterbased systems, and fulfilling most of the industrial requirements. The highly concentrated Hostavin Dispersions from Clariant ensure an efficient light stabilization of all kind of water-based coatings. Furthermore, they contribute to gloss and color stabilization in many different applications, such as automotive clear coats, industrial coatings, exterior wood finishes, and much more. Hostavin Dispersions outstand by its ease of incorporation, superior compatibility and handling.

In addition to the broad range of applications, other benefits are their extended shelf life due to an optimized formulation, with an improved VOC-related profile which makes them compliant with market regulations. Hostavin Dispersions have a light stabilizer concentration of 52%.

Hostavin 3330 disp. XP is the latest innovation in this range, based on a high performance triazine UV Absorber and developed especially to reach the specific requirements of most demanding applications.

Flame retardants Exolit® for intumescent coatings Clariant’s pioneering Exolit product series offers non-halogenated, nonmigrating flame retardants for intumescent coatings and various polymer applications. A highly effective “one and only” original ammonium polyphosphate product, Exolit AP allows customers to comply with the most stringent fire protection classifications with their intumescent formulations.

In addition, Clariant supports its customers with a dedicated intumescent coatings laboratory in Germany. Exolit AP’s ecological compatibility has been scientifically proven and approved by environmental authorities. Exolit AP has a long standing record of high and consistent quality. (source: Clariant)

Fire retardancy behavior of PLA based nanocomposites

This intersting article was published on January 2, 2012 in Polymer Degradation and Stability.

Abstract

To understand and improve the fire retardancy behavior of polylactic acid, we have incorporated two structurally different additives, sepiolite and organically modified montmorillonite. A novel approach (combination of electrospinning and extrusion/injection molding) is employed to address critical issues like char enhancement as well as the homogeneity/uniformity of the inorganic barrier during combustion of polymer nanocomposites. Fundamental knowledge is gained on the mechanisms of fire retardancy, particularly with samples of different thicknesses (thermally thin versus thermally intermediate/thick). Volumetric imaging of the residues provided a deeper understanding of the formation or the evolution of the inorganic barrier. Considerable insight on the dependency of biodegradation on the environment (primarily) and on the compromising effect of high aspect ratio nanoparticles is also obtained. This knowledge has a broader scientific impact and is critical to design the new generation of eco-benign flame retardant and biodegradable polymer nanocomposites.

 

Bayer’s First Flame-Retardant PC/ABS

Bayer MaterialScience LLC is debuting a new specialty grade of resin primarily designed for use in the medical market for applications such as diagnostic imaging equipment – computed tomography (CT), magnetic resonance imaging (MRI) and positron emission tomography (PET) scanners; workstations; and kiosks.

Bayblend® M303 FR (Technical sheet)  is a non-reinforced, flame-retardant, amorphous, thermoplastic polymer blend of polycarbonate and acrylonitrile butadiene styrene copolymer (PC/ABS) for extrusion, blow molding and thermoforming. It can be used in surface device applications contacting intact skin. Bayblend M303 FR PC/ABS meets the requirements of ISO 10993-5 (Cytotoxicity) and ISO 10993-10 (Irritation and Sensitization) guidelines.

The material has good chemical and hydrolysis resistance, excellent melt strength for extrusion and deep draw for thermoforming. Naturally opaque, this PC/ABS blend is also available in custom colors.

Bayblend M303 FR resin is the latest grade to join Bayer’s existing portfolio of materials for the medical market. “The addition of Bayblend M303 FR plastic to Bayer’s product offerings continues the history of innovation and proven technical and materials expertise that Bayer offers the medical industry,” says Bruce Fine, market segment leader, Medical and Consumer Products – Polycarbonates, Bayer MaterialScience LLC. (Source: Tech Greedy)

Flame Retardants Industry in China-(2012 report)

Flame retardants have been studied for years for its incomparable function in various products to prevent ignition of fire. At present, flame retardants are mostly applied in plastics and rubber which are used in the manufacture of PCB, electrical & electronics, wire & cable, motor vehicles etc., and textile and coating as well.

China has become a key player of flame retardants both in production and consumption. It can produce most common flame retardants with output of approximately 600,000 tonnes in 2011, and has witnessed domestic consumption almost 400,000 tonnes in 2011, both with CAGR over 15% in the past five years. And along with the global development trend of flame retardants, production and consumption of flame retardants in China is switching to some more eco-friendly products such as PFRs and ATH&MH. However, Chinese producers are still focusing on developing technologies of some secondary products while foreign producers have started the R&D of some up-scaled and specified products.

On another hand, as China is a flame retardant export-oriented country, international policies and regulations in flame retardants are important to its domestic flame retardant industry. With encouragements or restrictions to different types of flame retardants, what the producers and end users choose would be vital to the future prospect of flame retardants in China.

Generally speaking, with the domestic market volume enlarging greatly in recent years, there are various commercial opportunities in China’s flame retardant industry.

In order to state the detailed and accurate flame retardant industry situation in China in the past five years and to make a forecast in the coming five years, the report includes:

– CCM International focuses on domestic production for different flame retardant types, including BFRs, PFRs, CFRs and inorganic flame retardants, to discover their present domestic situation and future prospects.

– CCM International pays great attention to the major products and their producers in China.

– CCM International analyzes domestic consumption by application field.

– CCM International provides insights into key factors influencing flame retardant such as relevant policies and technologies in China.

CCM International forecasts future demand and output for each flame retardant type from 2012 to 2016 based on all the information.

CCM International analyzes the business environment of flame retardant industry in different products with Michael Porter’s Five Forces Model and points out some opportunities.

Through the above penetrations in this report, the latest dynamics and development trends of Chinese flame retardant industry will be clearly presented, which is valuable for investors, traders (both exporters and importers), technology providers, overseas competitors, etc.This report is finished in Feb. 2012, and is the second edition of CCM International’s report on Survey of Flame Retardant Industry in China. It focuses on the production and consumption of major types of flame retardants including BFRs, CFRs, PFRs and inorganic flame retardants in the past few years. It also gives out the forecasts of each type in the following five years, from 2012-1016. Also, it analyses the most influencing factors to China’s flame retardant industry and points out some potential investing opportunities through a Michael Porter’s Five Forces model of each type. (Source-give this report : ReportLinker)

Clay-chitosan nanobrick walls: Completely renewable gas barrier and flame retardant nanocoatings

This intersting article was published on February 16, 2012 in ACS Appl. Mater. Interfaces journal.

Abstract

Thin films prepared via layer-by-layer (LbL) assembly of renewable materials exhibit exceptional oxygen barrier and flame retardant properties. Positively- charged chitosan (CH), at two different pH levels (3 and 6), was paired with anionic montmorillonite (MMT) clay nanoplatelets. Thin film assemblies prepared with CH at high pH are thicker due to low polymer charge density. A 30 bilayer (CH pH 6-MMT) nanocoating (~100 nm thick) reduces the oxygen permeability of a 0.5 mm thick polylactic acid film by four orders of magnitude. This same coating system completely stops the melting of a flexible polyurethane foam, when exposed to direct flame from a butane torch, with just 10 bilayers (~ 30 nm thick). Cone calorimetry confirms that this coated foam exhibited a reduced peak heat release rate, by as much as 52%, relative to the uncoated control. These environmentally benign nanocoatings could prove beneficial for new types of food packaging or a replacement for environmentally persistent antiflammable compounds.

Halogen-free ultra-high flame retardant polymers through enzyme catalysis

Over the past few years, the use of certain types of halogenated flame retardant additives such as decabromodiphenylether has come under intense scrutiny due to their toxicity, environmental persistence and bio-accumulation. There is an immediate need for the development of non-toxic alternative flame retardant materials and fire resistant polymers with comparable or better efficacies, obtained using benign synthetic approaches. Enzymatic polymerization is being used increasingly as an environmentally friendly alternative method for the synthesis of functional materials including polymers and additives. Here, we report a biocatalytic synthesis of a new class of thermally stable, ultra-fire resistant polyphenols based on deoxybenzoins. In calorimetric studies, these polyphenols exhibit very low heat release capacities (comparable to Nomex™) and form a large amount of carbonaceous char rendering them suitable for flame retardant applications. (source: Green Chemistry))

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