Results (
Vietnamese) 1:
[Copy]Copied!
Most biobased polyols are synthesized from vegetable oils. And most of them are synthesized from epoxidized vegetable oils.Thus, JEFFADDTM B650 is a biobased polyol, exhibiting 65% of renewable carbon.This polyol, commercialized since March 2010 by HUNTSMAN Company, is dedicated topolyurethane synthesis for rigid foams, sprays, coatings, adhesives, mastics, and elastomers.This polyol is synthesized by the reaction of epoxidized soybean oil bearing 2 to 6 epoxidegroups per molecule with an alcohol amine at 120◦C during 4 hours (reaction B whereNuH is ethanolamine for instance). Alcohol amines react with epoxide groups and yielda mixture of primary and secondary hydroxyl groups.186 However, the amine could alsoreact with ester functions of triglycerides by amidification reaction, yielding shorter amidepolyols (reaction J, Table 1).BIOBASED TECHNOLOGIES developed a range of products: AGROLR which is abiobased polyol from soybean oil. AGROLR polyols content of 96% of renewable carbon,owing to ASTMD 6866 standard. The number of hydroxyl group per molecule varies from2 to 7 owing to different products. AGROLR polyols are synthesized from soybean oil inDownloaded by [University of Guelph] at 13:40 22 June 2012From Research to Industrial Biobased Polyols 65two steps. In the first step, double bonds of vegetable oils are epoxidized with a peracid(reaction A, Table 1). Oxirane groups are then ring-opened by the acid by-product of thefirst step187 (reaction B, Table 1). AGROLR DIAMOND polyol is prepared from AGROLRpolyols by aminolysis of ester functions of triglycerides by an alcohol amine (reaction J,Table 1).188 This explains the high hydroxyl index of DIAMOND polyols compared toother AGROL polyols (Table 2).CARGILL has proposed since 2006 a biobased polyol from soybean oil, BIOHR , with acontent of renewable carbon higher than 95% owing to ASTM 6866 standard. Polyurethaneflexible foams elaborated with this polyol exhibit a content of renewable carbon between5% and 20%. This polyol is synthesized from vegetable oils by epoxidation followed byepoxide ring opening by methanol in the presence of fluoroboric acid as catalyst (reaction B,Table 1where NuH is CH3OH),189,190 therefore, the synthesized polyol bears only secondaryalcohols functions on the aliphatic chain of fatty acid. Even if this structure is similar tocastor oil, double bonds are absent from these polyols which improve thermal stability.Two formulations of this polyol are proposed.COGNIS, and now BASF, proposes an abundant range of biobased polyols fromvegetable oils and derivatives under the brand name SOVERMOLR for various applicationssuch as adhesives, binders, floor coatings, castings, electro potting, etc. The chemical routeto yield these polyols is also based on the epoxidation of vegetable oils followed by ringopening of epoxides by nucleophilic attack of an alcohol (reaction B, Table 1 where NuHis CH3OH for instance). Then, in a third step, hydoxylated oils undergo transesterificationwith the same alcohol37 (reaction I, Table 1).A large range of biobased products from vegetable oils is also proposed by HOBUMOLEOCHEMICALS. This Company functionalizes vegetable oils such as castor oil, linseedoil, and soya bean oil, to synthesize polyols by epoxidation followed by nucleophilicattack (reaction B, Table 1). The nucleophilic reagent could be water, alcohol (mono ordiol), alcoholamine, or amine.191 These polyols are commercialized under the brand nameMERGINOL and are used for polyurethane synthesis for various applications: foams,coatings, dispersions, etc. There are two kinds of polyols in this range, polyester polyolsand polyether-polyester polyols.OLEON, owned by SOFIPROTEOL, commercializes three polyols under the brandname RADIAR (formerly NOVENOLR at NOVANCE): two polyesters polyols forsoft polyurethane foams (RADIAR 7291 and 7292) and a polyether polyol for rigidpolyurethane foam (RADIAR 7293). These polyols are based on different vegetable oils(sunflower, rapeseed, soya bean) and their renewable carbon content varies from 96%to 100%. Several patents of NOVANCE192,193 describe the synthesis of polyols fromfatty acids or vegetable oils; double bonds of fatty acids or vegetable oils are epoxidized by hydrogen peroxide with a metal catalyst (molybdenum or tungsten), then theepoxides undergo a nucleophilic attack by water194 (reaction B, Table 1 where NuH
is H2O).
BAYER develops a biobased polyurethane, BAYDURR PUL 2500, showing 20%
of renewable carbon and used in flexible and rigid polyurethane foams. It seems that
these polyols are synthesized from vegetable oils (preferably soybean oil) by epoxidation
followed by hydrogenation to lead secondary alcohols functions (reaction C, Table 1). These
alcohol functions are then ethoxylated or propoxylated by alkylene oxide (reaction L,
Table 1) with metal cyanide in order to lead to primary alcohol functions.195 Another
patent of BAYER describes
Being translated, please wait..