Researchers from India prepared castor oil polyurethane from pre-polymer oftoluene diisocyanate (TDI) and castor oil with dibutyl tin dilaurate (DBTDL) catalyst. Water was used as blowing agent. The rate of forming was increased by increasing catalyst and water content. On other hand the cell size of the PU decreased with increasing amount of the catalyst and water content.
Characterization studies were performed to analyse the properties of synthesized foam.
Recent research shows production of jet fuel from ricinoleic acid methyl ester.
Experiments conducted earlier have shown the possibility of producing jet fuel from castor oil or hydro processing castor oil.
Now scientists from China have found that jet fuel could be produced from castor oil derived ricinoleic acid methyl ester. A unique hydroxyl group in the ricinoleic acid chain induced a special thermal rearrangement reaction in medium chain fatty acid methyl ester (FAME) and heptanal formation. This reaction was used as a starting point for the production of jet fuel.
Results showed that the carbon selectivity in the castor oil to jet fuel process was as high as 90%.
Researchers from Finland have found a method to produce novel castor oil segmented thermoplastic polyurethanes which have controlled mechanical properties.
Thermoplastic polyurethane (TPU) is an elastomer that is fully thermoplastic. Like all thermoplastic elastomers, TPU is elastic and melt-processable. TPU is a linear segmented block copolymer composed of hard and soft segments. The hard segment can be either aromatic or aliphatic. The soft segment can either be a polyether or polyester type, depending on the application.
The new study shows that it is possible to produce thermoplastic polyurethanes using castor oil via polyaddition approach where the formation of prepolymers needs to be carried out with the addition of small amount of castor oil and excess of diisocyanate in the very first step. This is followed by the addition of the other polyols and finally a low molecular weight chain extender.
Results showed that the synthesized polyurethanes exhibited good biocompatibility and high transparency.
Recent study shows that a two-step mediation of castor oil could overcome the problem of polyaddition threshold of castor oil during polyurethane formation.
The study has been conducted by scientists from India who have found that the mediation facilitates formation of polyurethane systems directly from castor oil without the need for triricinolein chain extension or the use of supplementary hydroxyl compounds.
The process involves refluxing castor oil with n-butyl lithium in the presence of a solvent followed by water addition.
Results showed that the mediation introduces two new compounds in castor oil namely, a lithiated diglyceride and a lithium salt of fatty acid. Characterization studies of the newly synthesized polyurethane were also carried out.
Recent study shows production of wood adhesives from castor oil.
Commonly used wood adhesives were anima (hide) glue, urea-formaldehyde resin adhesives, resorcinol-formaldehyde, phenol-formaldehyde, polyurethane, etc.
Now scientists from Iran have conducted an experiment to produce polyester polyols, which is an important compound in polymeric polyurethane adhesives, from castor oil. The polyester polyols were synthesized condensation polymerization of different dicarboxylic acids with castor oil.
Characterization studies were also carried out to determine the shear strength value in various conditions such as cold water, hot water, acid and alkali solutions.
Recent study has found new castor oil based polymeric surfactants.
Polymeric surfactants are polymeric substances which tend to reduce surface tension of a liquid in which it is dissolved.
Now scientists from China have conducted an experiment to produce castor oil based polymeric surfactants. Dehydrated castor oil was epoxidized using phosphoric acid and acetic acid to produce epoxidized castor oil. Ring opening polymerization method was followed with to produce polymerized epoxidized castor oil (PECO) and hydrolysed PECO (HPECO).
Characterization studies showed that castor oil based polymeric surfactants exhibited high efficiency to reduce the surface tension of water.
Recent study has found the use of castor oil as antistatic and anticorrosive materials.
Antistatic property is defined as the fast dissipation of static electricity (static charge). It is evaluated using two measures – surface resistance and half-life. The lower the surface resistance (Ω), the higher the antistatic property; and the shorter the half-life (s), the higher the antistatic property.
A previous study conducted by scientists from Korea in 2004, has found that waterborne -polyurethane coating materials containing conductive polyaniline blend films showed reduced antistatic half-life.
Now, scientists from Korea and India have prepared castor oil-based waterborne polyurethane/polyaniline (COWPU/PAni) conducting polymer blend films. The waterborne polyurethane synthesized from isophorone diisocyanate was reacted with castor oil to form prepolymers. Also, COWPU/PAni hybrid dispersions were synthesized to make different conductive composites.
Characteristic studies showed that COWPU/PAni conducting blend films could be used as antistatic and anticorrosive coating materials.
Recent study has found a new source of biodiesel from castor oil which has less viscosity than the original castor oil.
Castor oil cannot be used as such for biodiesel production due to its high viscosity. Hence scientists from Singapore have found an alternative method to produce low viscosity biodiesel from castor oil.
By chemical modification of ricinolein in castor oil and methyl Ricinoleate, new products called ketone-containing glycerides were obtained. These ketone containing triglycerides were used for the production of biodiesel.
The biodiesel obtained by this method was found to have low viscosity.
Thus, vehicles can now run with a fuel which has less viscosity.
Here’s an interesting derivative possibility of an antibacterial product from ricinoleic acid, a derivative of castor oil.
Contamination is a big issue in any environment. It affects each and every stage in all the processes we do from manufacturing a product to its maintenance (shelf life). To control contamination, a suitable compound with a high antibacterial activity is to be added in an ongoing process.
A well-known example of compounds with antibacterial activity are naturally occurring phenolic compounds.
Now scientists from India have developed 7 novel ricinoleic acid glycosides having antibacterial activity using Koenigs–Knorr glycosylation reaction. On the whole, 28 ricinoleic acid glycosides were developed and their antibacterial activities were analysed. Seven of them were found to show promising wide spectrum antibacterial activity against gram positive bacteria.
Among the 7 compounds, two compounds namely mannopyranosyl- and the arabinofuranosyl derivatives were found to be effective against various non-clinical/clinical, overexpressed/resistant strains of Staphylococcus aureus and other gram positive bacteria such as Bacillus subtilis and Micrococcus luteus. It was found that the presence of sugar and its structure and the methyl ester protection of the carboxylic moiety of ricinoleic acid are responsible for these compounds to be bioactive.
Now industries looking for other potential compounds with antibacterial activity could go for these ricinoleic acid glycosides.
Wish to know more about Ricinoleic Acid – see here. Or other castor derivatives – see here.
A sealant is an elastomeric material that allows for 25% to 50% movement. They are used to level, fill gaps, seal holes and provide bonding and protection. Sealants are made by using either silicone or polyurethane.
Polyurethane sealants are formed by reacting an isocyanate component with amines, polyols or other active hydrogen compounds. Some polyurethane sealants are flame retardant where flame retardants such as ammonium polyphosphate are used along with the polymers to obtain the desired character. So far, only specialty polyols like polycarbonate polyols, polycaprolactone polyols, polybutadiene polyols, and polysulfide polyols have been used to make polyurethane sealants.
Now, Chinese researchers have developed a novel ricinoleic acid based phosphorus and nitrogen-containing flame retardant polyols (FRPE) for polyurethane sealants. The flame retardant polyols were characterized by different characterization techniques.
Flame retardant polyurethane sealants (FR-PUS) were prepared by curing flame retardant polyols with methylene diphenyl diisocyanate (MDI-50). The flame retardant properties of the polyurethane sealants were investigated using limiting oxygen index (LOI), cone calorimeter testing (CCT) and thermogravimetric analysis (TGA).
Results showed that flame retardant polyols could enhance the thermal stability and flame retardancy of polyurethane sealants without adding any other flame retardant.
Now, industries manufacturing polyurethane sealants could produce them in a renewable way which will be environmental friendly.