A new sand binder system cured by CO2 was prepared based on the animal bone glue.To overcome the disadvantages of animal glue such as agglomeration at room temperature,high energy consumption and low efficiency,an alk...A new sand binder system cured by CO2 was prepared based on the animal bone glue.To overcome the disadvantages of animal glue such as agglomeration at room temperature,high energy consumption and low efficiency,an alkaline decomposition process was selected,and certain modifier was used to modify the performance of the animal glue binder.For the alkaline decomposition,NaOH was used as the catalyst with an addition of 4wt.% to the animal glue.A modifier was determined through the orthogonal experiment with a weight ratio of glycerin:glycol:dextrin:animal glue = 9:16:15:100,and the optimal modification reaction should be performed at 75 ℃ with a reaction time of 90 min.Ca(OH)2 was used as a promoter;the optimal CO2 gas flux blowing into the sand was 0.7 m3.h-1 for a duration of 60s under the experimental conditions.Results show that an original strength above 0.7 MPa and a final strength about 4.2 MPa can be achieved,which could meet the requirement of rapid moulding and core-making for foundry.The new binder was characterized and analyzed by means of IR,and the modification and CO2-cured mechanisms of this animal glue binder were also discussed.展开更多
AIM:To observe the clinical efficacy of the combined use of small incision lenticule extraction(SMILE)-derived lenticule patches in corneal dermoid excision,with fixation of the lenticule patches assisted by fibrin gl...AIM:To observe the clinical efficacy of the combined use of small incision lenticule extraction(SMILE)-derived lenticule patches in corneal dermoid excision,with fixation of the lenticule patches assisted by fibrin glue.METHODS:Seventeen eyes of 17 patients with corneal dermoid were treated with dermoid removal combined with SMILE-derived lenticule transplantation.All lenticule patches were fixed by fibrin glue.Ocular changes were assessed using slit lamp microscopy and anterior-segmental optical coherence tomography.The best-corrected visual acuity(BCVA)and ocular dioptric variations were examined preoperatively and postoperatively.Intraocular pressure(IOP)was also monitored in all visited time.RESULTS:Totally,18 lenticule patches were used on 17 eyes of 17 cornea dermoid patients.The mean follow-up time was 11.47±5.28mo.All lenticule patches we resuccessfullyg lued,kept on its location and maintained transparent during the follow-up time,with a consecutive epithelial cover for 1wk.Nine of the patients could coordinate visual and optometry exam well.Their preoperative BCVA is 0.60±0.35 in decimal,significantly improved to 0.80±0.26 in decimal at 6mo postoperatively(Z=-2.392,P=0.017),but the changes of their corneal astigmatism diopters showed no significance,with 2.22±1.91 D preoperatively,and 2.28±1.31 D at 6mo postoperatively(Z=-0.135,P=0.893).Limbal pannus formation occurred in 4(23.52%)cases and decreased with the application of tacrolimus eyedrops.IOP increased in 2(11.76%)cases,but well decreased by timolol maleate eyedrops.All the adult patients or guardians of minor patients were satisfied with the cosmetic improvement.CONCLUSION:Dermoid excision combined with transplantation of SMILE-derived lenticule patches using fibrin glue is a safe and effective novel tectonic keratoplasty procedure for corneal dermoid.展开更多
In typical metal foundry applications,sand casting is still the most used technology.The related binder plays a very important role as its performances can directly influence the quality of castings.Among many binders...In typical metal foundry applications,sand casting is still the most used technology.The related binder plays a very important role as its performances can directly influence the quality of castings.Among many binders,glues of animal origin have attracted much attention in recent years due to their reduced environmental impact.How-ever,they display some drawbacks such as the tendency to coagulate easily at room temperature and a relatively low strength.In this study,a novel gas-hardening casting binder was prepared using an animal glue and anhy-drous potassium carbonate as a hydrolyzing agent to avoid undesired agglomeration.Moreover,sodium pyropho-sphate and furfuryl alcohol were exploited as modifiers to obtain a binder with a high compressive strength.The best modification conditions,determined by means of an orthogonal design matrix approach,were 4 g of Na2CO3,sodium pyrophosphate,furfuryl alcohol and animal glue with a ratio of 4:12:100,at 85°C and with a duration of 115 min,respectively.The viscosity of the mixture obtained under these optimized conditions was 1250 mPa⋅s.The compressive strength of the binder,hardened by CO_(2) gas,was 4.00 MPa.Its gas evolution at 850°C was 15 ml⋅g-1,and its residual strength after 10 min calculation at 800°C was 0.01 MPa,which is high enough to meet the requirement of core-making in foundry.Moreover,after hydrolysis and further modification,animal glue and modifiers displayed a grafting reaction and an esterification reaction,respectively,which made the adhesive network denser and improved its thermal stability.展开更多
基金financially supported by the National Natural Science Foundation of China(Grant No.51275313)
文摘A new sand binder system cured by CO2 was prepared based on the animal bone glue.To overcome the disadvantages of animal glue such as agglomeration at room temperature,high energy consumption and low efficiency,an alkaline decomposition process was selected,and certain modifier was used to modify the performance of the animal glue binder.For the alkaline decomposition,NaOH was used as the catalyst with an addition of 4wt.% to the animal glue.A modifier was determined through the orthogonal experiment with a weight ratio of glycerin:glycol:dextrin:animal glue = 9:16:15:100,and the optimal modification reaction should be performed at 75 ℃ with a reaction time of 90 min.Ca(OH)2 was used as a promoter;the optimal CO2 gas flux blowing into the sand was 0.7 m3.h-1 for a duration of 60s under the experimental conditions.Results show that an original strength above 0.7 MPa and a final strength about 4.2 MPa can be achieved,which could meet the requirement of rapid moulding and core-making for foundry.The new binder was characterized and analyzed by means of IR,and the modification and CO2-cured mechanisms of this animal glue binder were also discussed.
基金Supported by Science and Technology Planning Project of Guangxi Zhuang Autonomous Region (No.AB18221038)Guangxi Medical&Health Appropriate Technology Development and Promoted Application Project (No.S2021092)。
文摘AIM:To observe the clinical efficacy of the combined use of small incision lenticule extraction(SMILE)-derived lenticule patches in corneal dermoid excision,with fixation of the lenticule patches assisted by fibrin glue.METHODS:Seventeen eyes of 17 patients with corneal dermoid were treated with dermoid removal combined with SMILE-derived lenticule transplantation.All lenticule patches were fixed by fibrin glue.Ocular changes were assessed using slit lamp microscopy and anterior-segmental optical coherence tomography.The best-corrected visual acuity(BCVA)and ocular dioptric variations were examined preoperatively and postoperatively.Intraocular pressure(IOP)was also monitored in all visited time.RESULTS:Totally,18 lenticule patches were used on 17 eyes of 17 cornea dermoid patients.The mean follow-up time was 11.47±5.28mo.All lenticule patches we resuccessfullyg lued,kept on its location and maintained transparent during the follow-up time,with a consecutive epithelial cover for 1wk.Nine of the patients could coordinate visual and optometry exam well.Their preoperative BCVA is 0.60±0.35 in decimal,significantly improved to 0.80±0.26 in decimal at 6mo postoperatively(Z=-2.392,P=0.017),but the changes of their corneal astigmatism diopters showed no significance,with 2.22±1.91 D preoperatively,and 2.28±1.31 D at 6mo postoperatively(Z=-0.135,P=0.893).Limbal pannus formation occurred in 4(23.52%)cases and decreased with the application of tacrolimus eyedrops.IOP increased in 2(11.76%)cases,but well decreased by timolol maleate eyedrops.All the adult patients or guardians of minor patients were satisfied with the cosmetic improvement.CONCLUSION:Dermoid excision combined with transplantation of SMILE-derived lenticule patches using fibrin glue is a safe and effective novel tectonic keratoplasty procedure for corneal dermoid.
基金supported by the National Natural Science Foundation of China(51275313)Shandong Province Transportation Science and Technology Project(2021B115)Shandong Jiaotong University School Fund(Z2019036).
文摘In typical metal foundry applications,sand casting is still the most used technology.The related binder plays a very important role as its performances can directly influence the quality of castings.Among many binders,glues of animal origin have attracted much attention in recent years due to their reduced environmental impact.How-ever,they display some drawbacks such as the tendency to coagulate easily at room temperature and a relatively low strength.In this study,a novel gas-hardening casting binder was prepared using an animal glue and anhy-drous potassium carbonate as a hydrolyzing agent to avoid undesired agglomeration.Moreover,sodium pyropho-sphate and furfuryl alcohol were exploited as modifiers to obtain a binder with a high compressive strength.The best modification conditions,determined by means of an orthogonal design matrix approach,were 4 g of Na2CO3,sodium pyrophosphate,furfuryl alcohol and animal glue with a ratio of 4:12:100,at 85°C and with a duration of 115 min,respectively.The viscosity of the mixture obtained under these optimized conditions was 1250 mPa⋅s.The compressive strength of the binder,hardened by CO_(2) gas,was 4.00 MPa.Its gas evolution at 850°C was 15 ml⋅g-1,and its residual strength after 10 min calculation at 800°C was 0.01 MPa,which is high enough to meet the requirement of core-making in foundry.Moreover,after hydrolysis and further modification,animal glue and modifiers displayed a grafting reaction and an esterification reaction,respectively,which made the adhesive network denser and improved its thermal stability.
基金supported in part by the National Natural Science Foundation of China(Grant Nos.1140149811601097)the Fundamental Research Funds for the Central Universities of China(Grant No.20720140525)
