Traditional chrome tanning technology is still widely used today. In this technology, chrome shaving as well as chrome contained effluent in tanning and retanning processes is a big issue in the industry. Wet white ta...Traditional chrome tanning technology is still widely used today. In this technology, chrome shaving as well as chrome contained effluent in tanning and retanning processes is a big issue in the industry. Wet white tanning technology has been gaining in importance in recent years, but in general, the comprehensive performance of chrome-free tanned leather is not comparable with that of chrome tanned leather. In the present work, chrome-free tanning and chrome tanning are combined in a reversed procedure, which produces leather with chrome tanned leather quality without chrome tanned leather waste problems. In this procedure, a special amphoteric organic compound, no pickle, no salt chrome-free tanning agent TWT was used to tan delimed hides （no pickle） making wet white with shrinking temperature at 80-85 ~C. Then, new method called reversed tanning further process the wet white into chrome-tanned crust. In this reversed method, retanning, fatliquoring and coloring processes were carried out before chrome tanning. This technology eliminates chrome waste issue in tanning, shaving, post tanning processes. The chrome contained effluent is only concentrated in the last chrome tanning process. The leather made with this technology has complete conventional chrome-tanned leather quality. In this way, chrome leather quality without chrome waste problems was achieved. So, it is a new clean tanning technology.展开更多
Despite its potential as a metal-free tanning agent capable of eliminating Cr pollution in the leather industry,the conventional preparation of poly(carbamoyl sulfonate)faces challenges,such as the extensive use of lo...Despite its potential as a metal-free tanning agent capable of eliminating Cr pollution in the leather industry,the conventional preparation of poly(carbamoyl sulfonate)faces challenges,such as the extensive use of low-boiling organic solvents and low blocking ratios of-NCO groups.Herein,a liquid sulfonate chain extender,2,3-dihydroxypropanesulfonic acid triethylamine salt(DHPSTEA),was initially synthesized.A series of poly(carbamoyl sulfonate)tanning agents(CTAS)were then synthesized using DHPSTEA and various diisocyanates as reaction monomers,with sodium bisulfite serving as the blocking agent and without utilizing organic solvents.CTAS demonstrated a blocking ratio of>99%and satisfactory stability under acidic conditions at room temperature.Application experiments revealed that CTAS exhibited excellent tanning performance,with the parent diisocyanate monomer markedly influencing their tanning properties.CTAS synthesized with dicyclohexylmethane-4,4′-diisocyanate resulted in optimal product performance,yielding a shrinkage temperature of 83.2℃at a 6%dosage.CTAS-tanned leather displayed excellent collagen fiber dispersion,yellowing resistance and mechanical properties.Additionally,CTAS is easy to biodegrade(BOD5/COD>0.45).Thus,this novel metalfree tanning agent holds a great potential as a sustainable alternative to traditional chrome tanning agent.展开更多
Collagen,the main component of mammal skin,has been traditionally used in leather manufacturing for thousands of years due to its diverse physicochemical properties.Collagen is the most abundant protein in mammals and...Collagen,the main component of mammal skin,has been traditionally used in leather manufacturing for thousands of years due to its diverse physicochemical properties.Collagen is the most abundant protein in mammals and the main component of the extracellular matrix(ECM).The properties of collagen also make it an ideal building block for the engineering of materials for a range of biomedical applications.Reproductive medicine,especially human fertility preservation strategies and reproductive organ regeneration,has attracted significant attention in recent years as it is key in resolving the growing social concern over aging populations worldwide.Collagen-based biomaterials such as collagen hydrogels,decellularized ECM(dECM),and bioengineering techniques including collagen-based 3D bio-printing have facilitated the engineering of reproductive tissues.This review summarizes the recent progress in apply-ing collagen-based biomaterials in reproductive.Furthermore,we discuss the prospects of collagen-based materials for engineering artificial reproductive tissues,hormone replacement therapy,and reproductive organ reconstruction,aiming to inspire new thoughts and advancements in engineered reproductive tissues research.展开更多
Leather industry is facing new trends on production and consumption patterns due to society concerns.Circular economy is proposing a transition from the current economic model to a more sustainable one,in which waste ...Leather industry is facing new trends on production and consumption patterns due to society concerns.Circular economy is proposing a transition from the current economic model to a more sustainable one,in which waste is designed out and resources will be reused and recycled as long as possible.In this transition,Life Cycle Assessment(LCA)is an important tool to help decision-making.In the present review,39 English-written peer-reviewed papers related to LCA and leather have been found,30 of which were published in the last 6 years,meaning LCA is nowadays an important subject.Papers are presented within 4 types,focused on:1)the whole leather production process,2)a single step in the production process(e.g,new technologies for unhairing),3)waste treatment and recycling,and 4)life cycle thinking with ideas on long-term strategies for leather industries.As discussed in the literature review,leather industry has important challenges to address:increasing sustainability and transparency on the supply chain,and strengthening the beauty of leather.Taking up these challenges from a life cycle perspective will help leather industry flourish in the coming future.展开更多
The oral and craniofacial region consists of various types of hard and soft tissues with the intricate organization.With the high prevalence of tissue defects in this specific region,it is highly desirable to enhance ...The oral and craniofacial region consists of various types of hard and soft tissues with the intricate organization.With the high prevalence of tissue defects in this specific region,it is highly desirable to enhance tissue regeneration through the development and use of engineered biomaterials.Collagen,the major component of tissue extracellular matrix,has come into the limelight in regenerative medicine.Although collagen has been widely used as an essential component in biomaterial engineering owing to its low immunogenicity,high biocompatibility,and convenient extraction procedures,there is a limited number of reviews on this specific clinic sector.The need for mechanical enhancement and functional engineering drives intensive efforts in collagen-based biomaterials concentrating on therapeutical outcomes and clinical translation in oral and craniofacial tissue regeneration.Herein,we highlighted the status quo of the design and applications of collagen-based biomaterials in oral and craniofacial tissue reconstruction.The discussion expanded on the inspiration from the leather tanning process on modifications of collagen-based biomaterials and the prospects of multi-tissue reconstruction in this particular dynamic microenvironment.The existing findings will lay a new foundation for the optimization of current collagen-based biomaterials for rebuilding oral and craniofacial tissues in the future.展开更多
文摘Traditional chrome tanning technology is still widely used today. In this technology, chrome shaving as well as chrome contained effluent in tanning and retanning processes is a big issue in the industry. Wet white tanning technology has been gaining in importance in recent years, but in general, the comprehensive performance of chrome-free tanned leather is not comparable with that of chrome tanned leather. In the present work, chrome-free tanning and chrome tanning are combined in a reversed procedure, which produces leather with chrome tanned leather quality without chrome tanned leather waste problems. In this procedure, a special amphoteric organic compound, no pickle, no salt chrome-free tanning agent TWT was used to tan delimed hides （no pickle） making wet white with shrinking temperature at 80-85 ~C. Then, new method called reversed tanning further process the wet white into chrome-tanned crust. In this reversed method, retanning, fatliquoring and coloring processes were carried out before chrome tanning. This technology eliminates chrome waste issue in tanning, shaving, post tanning processes. The chrome contained effluent is only concentrated in the last chrome tanning process. The leather made with this technology has complete conventional chrome-tanned leather quality. In this way, chrome leather quality without chrome waste problems was achieved. So, it is a new clean tanning technology.
基金supported by the National Natural Science Foundation of China(Grant No.22078165)Major Projects of Tackling Key Industrial of Shandong’s New-Traditional Kinetic Energy Conversion.
文摘Despite its potential as a metal-free tanning agent capable of eliminating Cr pollution in the leather industry,the conventional preparation of poly(carbamoyl sulfonate)faces challenges,such as the extensive use of low-boiling organic solvents and low blocking ratios of-NCO groups.Herein,a liquid sulfonate chain extender,2,3-dihydroxypropanesulfonic acid triethylamine salt(DHPSTEA),was initially synthesized.A series of poly(carbamoyl sulfonate)tanning agents(CTAS)were then synthesized using DHPSTEA and various diisocyanates as reaction monomers,with sodium bisulfite serving as the blocking agent and without utilizing organic solvents.CTAS demonstrated a blocking ratio of>99%and satisfactory stability under acidic conditions at room temperature.Application experiments revealed that CTAS exhibited excellent tanning performance,with the parent diisocyanate monomer markedly influencing their tanning properties.CTAS synthesized with dicyclohexylmethane-4,4′-diisocyanate resulted in optimal product performance,yielding a shrinkage temperature of 83.2℃at a 6%dosage.CTAS-tanned leather displayed excellent collagen fiber dispersion,yellowing resistance and mechanical properties.Additionally,CTAS is easy to biodegrade(BOD5/COD>0.45).Thus,this novel metalfree tanning agent holds a great potential as a sustainable alternative to traditional chrome tanning agent.
基金the Sichuan Science and Technology Program(L.Q.,Grant No.2020YFS0127)the Y.Z.laboratory was financially supported by the Research project of Science&Technology Department of Sichuan Province(Y.Z.,Grant No.2021YJ0416)+3 种基金project of Chengdu Science and Technology Bureau,(Y.Z.,Grant No.2021-YF05-02110-SN)National Natural Science Foundation of China(Y.Z.,Grant No.82001496)China Postdoctoral Science Foundation(Y.Z.,Grant No.2020M680149,2020T130087ZX)the National Global Talents Recruitment Program(J.G.),National Natural Science Foundation of China(22178233)Talents Program of Sichuan Province,Double First Class University Plan of Sichuan University,State Key Laboratory of Polymer Materials Engineering(J.G.,Grant No.sklpme 2020-3-01).
文摘Collagen,the main component of mammal skin,has been traditionally used in leather manufacturing for thousands of years due to its diverse physicochemical properties.Collagen is the most abundant protein in mammals and the main component of the extracellular matrix(ECM).The properties of collagen also make it an ideal building block for the engineering of materials for a range of biomedical applications.Reproductive medicine,especially human fertility preservation strategies and reproductive organ regeneration,has attracted significant attention in recent years as it is key in resolving the growing social concern over aging populations worldwide.Collagen-based biomaterials such as collagen hydrogels,decellularized ECM(dECM),and bioengineering techniques including collagen-based 3D bio-printing have facilitated the engineering of reproductive tissues.This review summarizes the recent progress in apply-ing collagen-based biomaterials in reproductive.Furthermore,we discuss the prospects of collagen-based materials for engineering artificial reproductive tissues,hormone replacement therapy,and reproductive organ reconstruction,aiming to inspire new thoughts and advancements in engineered reproductive tissues research.
基金funded by the company Curtidos Badiaby the National Key Research and Development Program of China(2019YFC1904500)+2 种基金National Natural Science Foundation(NNSF)of China(21978177)by the Ceres-Procon Project(CTM2016-76176-C2-2-R)(AEI/FEDER,UE)financed by the Spanish Ministry of Economy and Competitiveness.
文摘Leather industry is facing new trends on production and consumption patterns due to society concerns.Circular economy is proposing a transition from the current economic model to a more sustainable one,in which waste is designed out and resources will be reused and recycled as long as possible.In this transition,Life Cycle Assessment(LCA)is an important tool to help decision-making.In the present review,39 English-written peer-reviewed papers related to LCA and leather have been found,30 of which were published in the last 6 years,meaning LCA is nowadays an important subject.Papers are presented within 4 types,focused on:1)the whole leather production process,2)a single step in the production process(e.g,new technologies for unhairing),3)waste treatment and recycling,and 4)life cycle thinking with ideas on long-term strategies for leather industries.As discussed in the literature review,leather industry has important challenges to address:increasing sustainability and transparency on the supply chain,and strengthening the beauty of leather.Taking up these challenges from a life cycle perspective will help leather industry flourish in the coming future.
基金supported by grants from National Natural Science Foundation of China(Grant No.22178233,32000928,22208228,32271416)Sichuan Science and Technology Program(Grant No.2022ZDZX0031,2023YFS0150)+1 种基金Natural Science Foundation of Sichuan Province(Grant No.2022NSFSC1735,2023NSFSC1097)National Talents Program,Double First Class University Plan of Sichuan University,State Key Laboratory of Polymer Materials Engineering(Grant No.sklpme 2020-03-01).
文摘The oral and craniofacial region consists of various types of hard and soft tissues with the intricate organization.With the high prevalence of tissue defects in this specific region,it is highly desirable to enhance tissue regeneration through the development and use of engineered biomaterials.Collagen,the major component of tissue extracellular matrix,has come into the limelight in regenerative medicine.Although collagen has been widely used as an essential component in biomaterial engineering owing to its low immunogenicity,high biocompatibility,and convenient extraction procedures,there is a limited number of reviews on this specific clinic sector.The need for mechanical enhancement and functional engineering drives intensive efforts in collagen-based biomaterials concentrating on therapeutical outcomes and clinical translation in oral and craniofacial tissue regeneration.Herein,we highlighted the status quo of the design and applications of collagen-based biomaterials in oral and craniofacial tissue reconstruction.The discussion expanded on the inspiration from the leather tanning process on modifications of collagen-based biomaterials and the prospects of multi-tissue reconstruction in this particular dynamic microenvironment.The existing findings will lay a new foundation for the optimization of current collagen-based biomaterials for rebuilding oral and craniofacial tissues in the future.
