This paper aims to develop a modified animal glue sand binder for foundry casting with improved water resistance and bonding strength.An efficient method is reported by using sodium hydroxide as the catalyst to improv...This paper aims to develop a modified animal glue sand binder for foundry casting with improved water resistance and bonding strength.An efficient method is reported by using sodium hydroxide as the catalyst to improve the operability of animal glue binder and allyl glycidyl ether as the modifier to improve the water resistance and bonding strength.Sand specimens prepared using allyl glycidyl ether-modified animal glue binder were cured by compressed air at room temperature.The proposed method saves energy and is environmentally friendly and inexpensive.Compared with unmodified animal glue binder,standard dog bone sand specimens with allyl glycidyl ether-modified animal glue binder had higher tensile strength of 2.58 MPa,flowability of 1.95 g,better water resistance(a lower decrease in tensile strength at 25°C and relative humidity of 60%),and good collapsibility.This allyl glycidyl ether-modified animal glue binder is suitable for practical application in the foundry industry.展开更多
加入适量的非水溶性溶剂(苯、环己烷、正己烷)和少量的水溶性溶剂(THF、甲醇、乙醇)可显著提高液-液相转移催化合成烯丙基缩水甘油醚的产率。当反应温度60℃,n(丙烯醇)∶n(环氧氯丙烷)∶n(NaOH)∶n(四丁基硫酸氢铵)=1.0∶2.0∶2.0∶0.01...加入适量的非水溶性溶剂(苯、环己烷、正己烷)和少量的水溶性溶剂(THF、甲醇、乙醇)可显著提高液-液相转移催化合成烯丙基缩水甘油醚的产率。当反应温度60℃,n(丙烯醇)∶n(环氧氯丙烷)∶n(NaOH)∶n(四丁基硫酸氢铵)=1.0∶2.0∶2.0∶0.01,每摩尔丙烯醇中加入120 mL苯和25 mL THF,反应时间1 h时,产品的产率大于86%,环氧值为0.866,质量分数为96.5%。采用液-液相转移催化,操作简单,条件温和,NaOH溶液加料容易。展开更多
基金This work was supported by Chongqing Science and Technology Commission(cstc2017shmsA90014)Fundamental Research Funds for the Central Universities(XDJK2019AA003)We thank Kathryn Sole,PhD,from Liwen Bianji,Edanz Group China(www.liwenbianji.cn/ac),for editing the English text of a draft of this manuscript.
文摘This paper aims to develop a modified animal glue sand binder for foundry casting with improved water resistance and bonding strength.An efficient method is reported by using sodium hydroxide as the catalyst to improve the operability of animal glue binder and allyl glycidyl ether as the modifier to improve the water resistance and bonding strength.Sand specimens prepared using allyl glycidyl ether-modified animal glue binder were cured by compressed air at room temperature.The proposed method saves energy and is environmentally friendly and inexpensive.Compared with unmodified animal glue binder,standard dog bone sand specimens with allyl glycidyl ether-modified animal glue binder had higher tensile strength of 2.58 MPa,flowability of 1.95 g,better water resistance(a lower decrease in tensile strength at 25°C and relative humidity of 60%),and good collapsibility.This allyl glycidyl ether-modified animal glue binder is suitable for practical application in the foundry industry.
文摘加入适量的非水溶性溶剂(苯、环己烷、正己烷)和少量的水溶性溶剂(THF、甲醇、乙醇)可显著提高液-液相转移催化合成烯丙基缩水甘油醚的产率。当反应温度60℃,n(丙烯醇)∶n(环氧氯丙烷)∶n(NaOH)∶n(四丁基硫酸氢铵)=1.0∶2.0∶2.0∶0.01,每摩尔丙烯醇中加入120 mL苯和25 mL THF,反应时间1 h时,产品的产率大于86%,环氧值为0.866,质量分数为96.5%。采用液-液相转移催化,操作简单,条件温和,NaOH溶液加料容易。
