Modified rubber seed oil based polyurethane foams

Properties of waterborne polyurethane films: effects of blend formulation with hydroxyl telechelic natural rubber and modified rubber seed oils

“…Hydroxylated rubber seed oil with hydroxyl values 200 and 270 mgKOH/g, as shown in Table 1, was prepared by a technique described elsewhere [28,38]. Toluene diisocyanate (TDI) was purchased from Merck.…”

“…They have lot of unsaturated fatty acids on triglyceride. These structures are easily modified to be polyols by various reactions for instance, ring opening of epoxide groups with acid [20,28,38] or alcohol [26], etc. With different types of unsaturated fatty acids on the triglyceride, these are attractive sources to modify to various hydroxyl values, and to enhance the properties of polyurethane.…”

“…The total rubber plantation area was extensive at 17.32 million rai (1 Rai = 0.16 ha) in 2012 [27,28]. Based on an estimated average of 10 kg seeds per rai, the annual production of rubber seeds in Thailand should be about 180 million kilograms [29].…”

High value polyurethane resins from rubber seed oil

“…RSO polyols have been made by transesterification with glycerin to obtain a mixture of monoglycerides, diglycerides and triglycerides and have been used to make polyurethanes of fairly low mechanical strength . Epoxidized RSO has been ring opened with formic acid to obtain polyols with hydroxyl numbers (OH#s) of 120 and 230 mg KOH g −1 and used in polyurethane adhesives and foams . Oils with high unsaturation like RSO can be used for high value polyurethanes such as matrix resins for glass reinforced composites or filled casting, as well as potting and embedding compounds for electrical insulation.…”

“…10,11 Epoxidized RSO has been ring opened with formic acid to obtain polyols with hydroxyl numbers (OH#s) of 120 and 230 mg KOH g −1 and used in polyurethane adhesives and foams. 12,13 Oils with high unsaturation like RSO can be used for high value polyurethanes such as matrix resins for glass reinforced composites or filled casting, as well as potting and embedding compounds for electrical insulation. RSO is dark brown in color which may be an issue in some applications such as coatings.…”