OIL GEL FOR ASPHALT MODIFICATION AND REJUVENATION

The present invention is an asphalt rejuvenator made from a specific styrenic block copolymer, bio-based oil or a bio-based oil blend, and an antioxidant system. The bio-based oil or a bio-based oil blend has a flash point of >230 ° C., and the asphalt rejuvenator has a maximum viscosity of <2000 cP at 180° C. when measured at 6.8/seconds shear rate. An alternate embodiment of the present invention is a pavement composition of RAP and/or RAS, asphalt rejuvenator, and virgin asphalt with and without a crosslinker. Lastly, the invention includes a method of making an asphalt rejuvenator composition referred to above, and blending it with RAP and fresh asphalt. An emulsion is also described and claimed comprising asphalt rejuvenator, water and an emulsifier. 1. An asphalt rejuvenator comprising:59-33 wt. % of a bio-based oil capable of fully dissolving at least 40 wt. % styrenic block copolymer,40-65 wt. % styrenic block copolymer comprising a mixture of: a) styrene butadiene diblock and b) styrene butadiene triblock and/or multiarm block copolymers, and1-2 wt. % of an antioxidant system,wherein said bio-based oil or bio-based oil blend has flash point ≧230° C. and the styrene butadiene block copolymer is a mixture of diblock and triblock and/or multiarm styrenic block copolymers where the diblock to triblock and/or multiarm block ratio is greater than 1:1, and the viscosity of the asphalt rejuvenator gel at 180° C. is a maximum of 2000 cP when measured at 6.8/seconds shear rate.2. The asphalt rejuvenator of claim 1 , wherein said antioxidant system is a combination of primary and secondary antioxidants.3. The asphalt rejuvenator of claim 2 , wherein said primary antioxidant is a hindered phenol or arylamine claim 2 , and said secondary antioxidant is phosphites and/or thiosynergists.4. The asphalt rejuvenator of claim 1 , wherein said bio-based oil is linseed oil or a blend of linseed oil and one or more other oils.5. The asphalt rejuvenator of claim 4 , wherein said ...

RECLAIMED ASPHALT COMPOSITION AND METHODS OF MAKING AND USING SAME

A method of forming a paving composition using reclaimed asphalt pavement (RAP) and/or reclaimed asphalt shingle (RAS) is provided. The method comprises: a) providing a rejuvenated asphalt binder consisting essentially of bitumen, a block copolymer and a bio-oil, wherein the rejuvenated asphalt binder has a rotational viscosity at 135° C. equal to or less than 1000 centipoise, an original G*/sin δ at 64° C. equal to or greater than 1 kPa where G* is the complex shear modulus and δ is the phase angle; a G*/sin δ at 64° C. equal to or greater than 2.2 kPa after aging in a Rolling Thin Film Oven (RTFO); b) providing a virgin asphalt; c) heating the virgin asphalt to 160-200° C.; d) providing a RAP and/or RAS; and e) mixing the heated virgin asphalt, RAP/RAS, and the rejuvenated asphalt binder under conditions suitable to form the paving composition. 1. A method of forming a paving composition comprising:providing a rejuvenated asphalt binder consisting essentially of bitumen, a block copolymer composition and a bio-oil, wherein the rejuvenated asphalt binder has a rotational viscosity at 135° C. of equal to or less than about 1000 centipoise, an original G*/sin δ at 64° C. of equal to or greater than about 1 kPa where G* is the complex shear modulus and δ is the phase angle; and after aging in a Rolling Thin Film Oven (RTFO) a G*/sin δ at 64° C. of equal to or greater than about 2.2 kPa and % recovery at 3.2 kPa at 64° C. of equal to or greater than about 80%;providing a virgin aggregate;providing a reclaimed asphalt pavement (RAP) and/or a reclaimed asphalt shingle (RAS);mixing the virgin aggregate, RAP and/or RAS, and the rejuvenated asphalt binder under conditions suitable for the formation of the paving composition.2. The method of further comprising:providing a virgin asphalt and mixing the virgin asphalt with the virgin aggregate, RAP/RAS, and the rejuvenated asphalt binder under conditions suitable for the formation of the paving composition.3. The method of ...

Block Copolymers and Polymer Modified Bitumen Therefrom

Disclosed herein are linear block copolymers of formula A-B-A′ or A-B*B-A′, wherein blocks A and A′ are polystyrene blocks, block B is a poly(conjugated diene) block and * is a coupling agent having a vinyl content of from 10-60 mol %. The block copolymers have a polystyrene content of from 20-35 wt. %, relative to the overall weight of the block copolymer, and a molecular weight of from 200,000-300,000 g/mol. The block copolymers can be used with a wide variety of asphalt grades, and are valuable for producing homogeneous polymer modified asphalt compositions having an effective combination of performance properties, such as acceptable viscosity, good elastic response to an applied stress, and a low non-recoverable creep compliance. The combination of vinyl content and polymerization technology allows a high solution concentration during polymerization without excessive processing viscosity. 1. A block copolymer having a formula of A-B-A′ or (A-B)—X—(B-A′) , A and A′ are vinyl aromatic blocks having different molecular weights,', 'A and A′ have different molecular weights, with the molecular weight difference ranging from 3,000 to 8,000 g/mol,', 'B is a conjugated diene block,', 'B has an average vinyl content ranging from 20-60 mol %,', 'n and m>=1, and X is a coupling agent;, 'wherein the block copolymer has a polystyrene content of 20-35 wt. %, relative to the overall weight of the block copolymer, and', 'the block copolymer has a molecular weight of 200,000-300,000 g/mol., 'wherein'}2. The block copolymer of claim 1 , wherein the block copolymer has the formula (A-B)—X—(B-A′)with n and m having a value of 1.3. The block copolymer of claim 2 , and wherein the block copolymer further comprises up to 25 wt. % based on the total weight of the block copolymer claim 2 , a second block copolymer having the structure (A-B)—X—(B-A′) claim 2 , with n and m having a value of >1 and <=5.4. The block copolymer of claim 3 , wherein the second block copolymer with the ...

ASPHALT COMPOSITIONS AND METHODS OF MAKING SAME

A coupled block copolymer composition with a combination of high viscosity at manufacturing, finishing and handling conditions, low viscosity at asphalt blending conditions and suitable viscosity stability is provided for use in asphalt compositions. The composition comprises: (i) a diblock copolymer, (ii) at least a linear triblock copolymer having a peak molecular weight that is 1.5 to 3.0 times the peak molecular weight of the diblock copolymer, and (iii) at least a multiarm coupled block copolymer having a peak molecular weight that is 1.5 to 9.0 times the peak molecular weight of the diblock copolymer, and mixtures thereof. The block copolymer composition is characterized as having a melt viscosity at 110° C. or less of greater than 2.0E7 Poise and a coupling efficiency after 24 hours at 180° C. is less than 25%. 1. A coupled block copolymer composition comprising: (i) a diblock copolymer comprising one block of a monovinylaromatic hydrocarbon and one block of a conjugated diene having a peak molecular weight from 30 ,000 to 78 ,000 , each block copolymer has a vinyl content from 8 to 80 mol percent based on the number of repeat monomer units in the conjugated diene block , (ii) a linear triblock copolymer having a peak molecular weight that is 1.5 to 3.0 times the peak molecular weight of the diblock copolymer , and (iii) a multiarm coupled block copolymer having a peak molecular weight that is 1.5 to 9.0 times the peak molecular weight of the diblock copolymer ,wherein the composition has a sufficient coupling efficiency to have a melt viscosity at less than 110° C. of greater than 2.0E7 Poise;wherein the composition is prepared by coupling a diblock copolymer with a coupling agent such that the composition decouples at a temperature at or above180° C. and after 24 hours for a coupling efficiency of less than 25%.2. The coupled block copolymer composition of claim 1 , wherein the multiarm coupled block copolymer is present in an amount of less than 5 wt. % of ...

Asphalt compositions and methods of making same

Asphalt compositions and methods of making same

A coupled block copolymer composition with a combination of high viscosity at manufacturing, finishing and handling conditions, low viscosity at asphalt blending conditions and suitable viscosity stability is provided for use in asphalt compositions. The composition comprises: (i) a diblock copolymer, (ii) at least a linear triblock copolymer having a peak molecular weight that is 1.5 to 3.0 times the peak molecular weight of the diblock copolymer, and (iii) at least a multiarm coupled block copolymer having a peak molecular weight that is 1.5 to 9.0 times the peak molecular weight of the diblock copolymer, and mixtures thereof. The block copolymer composition is characterized as having a melt viscosity at 110°C or less of greater than 2.0E7 Poise and a coupling efficiency after 24 hours at 180°C is less than 25%.

Block copolymers and polymer modified bitumen therefrom

【課題】負荷要因、天候条件等によって生じる弾性応答の改善、疲労亀裂の減少、低温亀裂の低減、わだち掘れの低減など、アスファルトミックスの特性をさらに改善し、得られる道路の性能を改善するように強化されたバインダ調合物を提供すること。【解決手段】式Ａ−Ｂ−Ａ’又はＡ−Ｂ＊Ｂ−Ａ’（式中、ブロックＡ及びＡ’はポリスチレンブロックであり、ブロックＢはポリ（共役ジエン）ブロックであり、＊は、１０〜６０ｍｏｌ％のビニル含有量を有するカップリング剤である）の線状ブロックコポリマーが、本明細書に開示される。ブロックコポリマーは、ブロックコポリマーの全重量に対して、２０〜３５重量％のポリスチレン含有量を有し、２００，０００〜３００，０００ｇ／ｍｏｌの分子量を有する。ブロックコポリマーは、多様なアスファルトグレードで使用することができ、許容される粘度、適用された応力への良好な弾性応答及び回復不能なクリープコンプライアンスの低さなどの性能特性の効果的な組み合わせを有する、均一なポリマー改質アスファルト組成物を生成するために価値がある。ビニル含有量及び重合技術の組み合わせによって、過剰な加工粘度を伴わずに、重合中の高い溶液濃度が可能になる。【選択図】なし

Oil gel for asphalt modification and rejuvenation

The present invention is an asphalt rejuvenator made from a specific styrenic block copolymer, bio-based oil or a bio-based oil blend, and an antioxidant system. The bio-based oil or a bio-based oil blend has a flash point of >230° C., and the asphalt rejuvenator has a maximum viscosity of <2000 cP at 180° C. when measured at 6.8/seconds shear rate. An alternate embodiment of the present invention is a pavement composition of RAP and/or RAS, asphalt rejuvenator, and virgin asphalt with and without a crosslinker. Lastly, the invention includes a method of making an asphalt rejuvenator composition referred to above, and blending it with RAP and fresh asphalt. An emulsion is also described and claimed comprising asphalt rejuvenator, water and an emulsifier.

Reclaimed asphalt composition and methods of making and using same

A method of forming a paving composition using reclaimed asphalt pavement (RAP) and/or reclaimed asphalt shingle (RAS) is provided. The method comprises: a) providing a rejuvenated asphalt binder consisting essentially of bitumen, a block copolymer and a bio-oil, wherein the rejuvenated asphalt binder has a rotational viscosity at 135° C. equal to or less than 1000 centipoise, an original G*/sin δ at 64° C. equal to or greater than 1 kPa where G* is the complex shear modulus and δ is the phase angle; a G*/sin δ at 64° C. equal to or greater than 2.2 kPa after aging in a Rolling Thin Film Oven (RTFO); b) providing a virgin asphalt; c) heating the virgin asphalt to 160-200° C.; d) providing a RAP and/or RAS; and e) mixing the heated virgin asphalt, RAP/RAS, and the rejuvenated asphalt binder under conditions suitable to form the paving composition.

Oil gel for asphalt modification and rejuvenation

The present invention is an asphalt rejuvenator made from a specific styrenic block copolymer, bio-based oil or a bio-based oil blend, and an antioxidant system. The bio-based oil or a bio-based oil blend has a flash point of > 230°C, and the asphalt rejuvenator has a maximum viscosity of < 2000 cP at 180°C when measured at 6.8/seconds shear rate. An alternate embodiment of the present invention is a pavement composition of RAP and/or RAS, asphalt rejuvenator, and virgin asphalt with and without a crosslinker. Lastly, the invention includes a method of making an asphalt rejuvenator composition referred to above, and blending it with RAP and fresh asphalt. An emulsion is also described and claimed comprising asphalt rejuvenator, water and an emulsifier.