Particulate carbon material producible from renewable raw materials and method for its production
The present invention relates to a particulate carbon material that can be produced from renewable raw materials, in particular from biomass containing lignin, comprising: a MC content that corresponds to that of the renewable raw materials, said content being preferably greater than 0.20 Bq/g carbon, especially preferably greater than 0.23 Bq/g carbon, but preferably less than 0.45 Bq/g carbon in each case; a carbon content in relation to the ash-free dry substance of between 60 ma. % and 80 ma. %; an STSA surface area of the primary particles of at least 5 m 2 /g and at most 200 m 2 /g; and an oil absorption value (OAN) of between 50 ml/100 g and 150 ml/100 g. The present invention also relates to a method for producing said carbon material and to the use thereof.
1 . A pneumatic tire comprising:
a vulcanized rubber mixture of the following ingredients: at least one rubber material and a particulate carbon material derived from hydrothermal carbonization of a lignin-containing biomass, the particulate carbon material having a carbon content based on ash-free dry substance from 60 weight % to 80 weight % and a statistical thickness surface area (STSA) of at least 5 m 2 /g to maximally 200 m 2 /g, wherein a BET surface area of the particulate carbon material differs from the STSA by maximally 20%.
2 . The pneumatic tire of claim 1 , wherein the particulate carbon material has a carbon content based on the ash-free dry substance between 65 weight % and 75 weight %.
3 . The pneumatic tire of claim 1 , wherein the particulate carbon material has at least one of the following further characteristics:
a 14 C content between 0.20 Bq/g and 0.45 Bq/g;
or
an oil absorption value (OAN) from 50 ml/100 g to 150 ml/100 g.
4 . The pneumatic tire of claim 1 , wherein the particulate carbon material derived from hydrothermal carbonization of a lignin-containing biomass is a hydrothermally carbonized lignin.
5 . The pneumatic tire of claim 4 , wherein the hydrothermally carbonized lignin has a carbon content based on the ash-free dry substance between 65 weight % and 75 weight %.
6 . The pneumatic tire of claim 4 , wherein the hydrothermally carbonized lignin has at least one of the following further characteristics:
a 14 C content between 0.20 Bq/g and 0.45 Bq/g;
a statistical thickness surface area (STSA) of at least 5 m 2 /g and maximally 200 m 2 /g; or
an oil absorption value (OAN) from 50 ml/100 g to 150 ml/100 g.
7 . The pneumatic tire of claim 4 , wherein the hydrothermally carbonized lignin comprises a pore volume of <0.1 cm 3 /g.
8 . The pneumatic tire of claim 4 , wherein the hydrothermally carbonized lignin is not porous.
9 . The pneumatic tire of claim 4 , wherein a BET surface area of the hydrothermally carbonized lignin differs from the STSA by maximally 20%.
10 . The pneumatic tire of claim 4 , wherein the rubber material is selected from the group consisting of: natural rubber, styrene-butadiene copolymers (SBR), polybutadiene (BR), polyisoprene, isobutylene-isoprene copolymers, ethylene-propylene-diene copolymers, acrylonitrile-butadiene copolymers (NBR), chloroprene, fluorine rubber, acrylic rubber, and mixtures thereof.
11 . The pneumatic tire of claim 10 , wherein the rubber material is selected from the group consisting of: natural rubber, polybutadiene (BR), polyisoprene, isobutylene-isoprene copolymers, and mixtures thereof.
12 . The pneumatic tire of claim 4 , wherein the ingredients further comprise a coupling reagent, and the rubber material comprises styrene-butadiene copolymers (SBR).
13 . The pneumatic tire of claim 1 , wherein the particulate carbon material is not a carbon black material.
14 . The pneumatic tire of claim 1 , wherein the particulate carbon material is neither a conventional carbon black material nor a bio-based carbon black material.
15 . A pneumatic tire comprising: a vulcanized rubber mixture of the following ingredients:
at least one rubber material;
a silane-based coupling reagent; and
a hydrothermally carbonized lignin that has a carbon content based on ash-free dry substance from 60 weight % to 80 weight % and has a statistical thickness surface area (STSA) of at least 5 m 2 /g to maximally 200 m 2 /g,
wherein a BET surface area of the particulate carbon material differs from the STSA by maximally 20%.
16 . The pneumatic tire of claim 15 , wherein the hydrothermally carbonized lignin has a carbon content based on the ash-free dry substance between 65 weight % and 75 weight %.
17 . The pneumatic tire of claim 15 , wherein an amount of the silane-based coupling reagent in the ingredients is from 2 weight % to 16 weight % based on weight of the hydrothermally carbonized lignin.
18 . The pneumatic tire of claim 17 , wherein the amount of the silane-based coupling reagent in the ingredients is from 6 weight % to 12 weight % based on the weight of the hydrothermally carbonized lignin.
19 . The pneumatic tire of claim 15 , wherein an amount of the hydrothermally carbonized lignin in the ingredients is from 10 weight % to 150 weight % based on weight of the at least one rubber material.
20 . The pneumatic tire of claim 19 , wherein the amount of the hydrothermally carbonized lignin is about 10 weight % based on the weight of the at least rubber material.
21 . The pneumatic tire of claim 15 , wherein the pneumatic tire includes a tire tread and/or a tire side wall, wherein the tire tread and/or the tire side wall includes the at least one rubber material.