Bio-based additive for asphalt
Compositions comprising asphalt and corn oil are provided, as are the shingles made using the compositions, methods for making the compositions, and methods for making the shingles. The compositions comprise mixtures of asphalt and corn oil, and the mixtures are oxidized to attain desirable properties.
1 . A shingle coating composition comprising an oxidized mixture of asphalt and corn oil, wherein the corn oil is obtained as a byproduct of ethanol fermentation and includes fatty acid ethyl esters obtained from esterification during the fermentation, wherein the fatty acid ethyl esters include ethyl linoleate, ethyl linolenate, ethyl oleate, ethyl palmitate, and ethyl stearate; and
wherein the corn oil contains the fatty acid ethyl esters in an amount of about 10% w/w or more.
2 . The shingle coating composition of claim 1 , wherein the shingle coating composition has a higher softening point as measured pursuant to ASTM D36 and a higher penetration value at 25° C. as measured pursuant to ASTM D5 as compared to a shingle coating composition without the corn oil.
3 . The shingle coating composition of claim 2 , wherein the softening point is about 210° F. to about 235° F. and the penetration value is at least about 10 dmm.
4 . The shingle coating composition of claim 1 , wherein the coating composition has a penetration value of at least about 10 dmm.
5 . The shingle coating composition of claim 1 , wherein the coating composition has a softening point of about 210° F. to about 235° F.
6 . A shingle comprising a base and a coating on the base, the coating comprising an oxidized mixture of asphalt and corn oil, wherein the corn oil is obtained as a byproduct of ethanol fermentation and includes fatty acid ethyl esters obtained from esterification during the fermentation and wherein the fatty acid ethyl esters include ethyl linoleate, ethyl linolenate, ethyl oleate, ethyl palmitate, and ethyl stearate; and
wherein the corn oil contains the fatty acid ethyl esters in an amount of about 10% w/w or more.
7 . The shingle of claim 6 , wherein the coating has a higher softening point as measured pursuant to ASTM D36 and a higher penetration value at 25° C. as measured pursuant to ASTM D5 as compared to a coating without the corn oil.
8 . The shingle of claim 6 , wherein the shingle exhibits a reduction in mass loss relative to a shingle comprising a coating without the corn oil and when subjected to accelerated weathering by a Xenon Arc Weatherometer according to ASTM G155 for 3000 hours.
9 . The shingle coating composition of claim 1 , wherein the corn oil further includes free fatty acids selected form arachidic acid, caproic acid, capric acid, caprylic acid, lauric acid, linolenic acid, linoleic acid, myristic acid, oleic acid, palmitic acid, stearic acid, or combinations thereof.
10 . The shingle coating composition of claim 9 , wherein the corn oil includes less than 15% w/w of the free fatty acids.
11 . The shingle coating composition of claim 1 , wherein the shingle coating composition exhibits a reduced melt viscosity relative to a shingle coating composition without the corn oil.
12 . The shingle coating composition of claim 1 , wherein the shingle coating composition has a melt viscosity at 400° F. of 150 cps to 450 cps.
13 . The shingle coating composition of claim 1 , wherein the shingle coating composition, when applied as a coating composition on a base to form a shingle, exhibits a reduction in mass loss relative to a shingle comprising a coating without the corn oil and when subjected to accelerated weathering by a Xenon Arc Weatherometer according to ASTM G155 for 3000 hours.
14 . The shingle coating composition of claim 1 , wherein the corn oil is added to the asphalt prior to oxidization.