【作者】 赵伟；

【导师】 潘鹏举； 张贵梓；

【作者基本信息】 浙江大学 ， 工程（专业学位）， 2021， 硕士

【摘要】 环氧树脂具有较高的力学强度、良好的粘附性能、热稳定性和化学稳定性,在涂料、粘合剂、复合材料等领域应用广泛。然而,环氧树脂的初始黏度较大,产品性能高度依赖固化配方和固化条件,固化速率难以调控;且环氧树脂几乎不含亲水性基团,在水中极易分相,难以水性化应用,这都使得其应用效果和场合受到极大限制。针对环氧树脂固化行为和产品性能调控困难、难以水性化改性的问题,本文选择了正丁基缩水甘油醚作为活性稀释剂,固化剂A、固化剂B、固化剂C和固化剂D作为固化剂、Tween80和Span80等作为乳化剂,研究了环氧树脂的改性及其应用。首先研究了正丁基缩水甘油醚加入后对双酚A型环氧树脂流变性质的影响。结果表明正丁基缩水甘油醚的加入能够显著降低体系黏度,可有效改善环氧树脂的流动性能,且加入后样品力学性能仍较好。进一步对稀释环氧树脂在中温(60℃)和高温(140℃)下的固化行为进行研究,结果表明体系的固化速率可通过改变固化剂A的加入量来实现有效调控。红外光谱显示了两种固化温度下体系固化反应的有效进行。力学性能评价表明,提高温度和增加固化剂A加入量均可有效提高体系固化后的力学性能,当候凝时间在1～2h时,在中温下压缩强度和杨氏模量最高可分别为119 MPa和729 MPa,在高温下压缩强度和杨氏模量最高可分别达到239 MPa和1049 MPa。以上结果表明了稀释环氧树脂固化体系的成功构建,且其固化行为和样品性能可通过改变固化剂加入量实现有效调控。进一步对稀释环氧树脂固化体系在实际使用环境中的性能进行了研究。环氧树脂体系在水或煤油环境下固化产物性能与大气环境下的固化产物性能差别较小,在特殊使用环境中性能稳定性良好。该环氧树脂体系与石英砂或固井水泥混用时,两者均可混合均匀,配伍性能良好;同时,其对岩芯和不锈钢钢片的粘结性能良好,在60℃和140℃下粘结强度可分别为5.13 MPa和7.89MPa。以上试验说明环氧树脂体系在不同使用环境中的固化后样品性能均较好,且可与多种物料配伍使用。最后,研究了所制备的稀释环氧树脂固化体系的水性化改性及其在固砂场合的应用。结果表明,环氧树脂体系能够被特定亲水亲油平衡值的Tween80/Span80复配乳化剂体系乳化,形成稳定均匀的溶液,且贮存稳定性良好。对固化剂A、固化剂C和固化剂D三种固化剂的水环境下固化效果进行研究,发现固化剂A综合表现出了最好的固化速率和力学性能;对三种固化剂在60℃下固化环氧树脂乳液得到的固化砂柱的压缩强度和渗透率进行综合评价,发现固化剂A固化砂柱具有最好的固砂性能,其压缩强度和渗透率分别为1.82 MPa和0.025 D,表明稀释环氧树脂固化体系可良好应用于固砂场合。对优选固砂体系在不同温度和水含量下力学强度和渗透性能的研究表明,固砂体系在不同温度和水含量下的性能保持稳定,可以应用于实际固砂场合。更多还原

【Abstract】 As epoxy resin possesses good mechanical strength,excellent adhesivity,thermal and chemical stabilities,it has been widely used in coating,adhesive and composite fields.However,epoxy resin with high initial viscosity is difficult to control the curing rate,and its performance is strongly influenced by the curing formula and condition.Moreover,it scarcely contains hydrophilic groups,which is easy to phase-separate in water and difficult for the waterborne applications.These disadvantages of epoxy resin greatly limit its applications.In this study,we selected n-butyl glycidyl ether as a reactive diluent,A,B,C and D as the curing agents,Tween80 and Span80 as the emulsifiers,to study the property modification and application of epoxy resin.First,the effect of n-butyl glycidyl ether,used as a reactive diluent,on the rheological property of bisphenol A epoxy resin was investigated.We find that the addition of n-butyl glycidyl ether decreases the viscosity obviously and improves the fluidity of epoxy resin;the cured sample also has good mechanical property.Curing behaviors of diluted epoxy resin at the medium(60℃)and high(140℃)temperatures were further examined.It indicates that the curing rate can be regulated by varying the content of curing agent A.Infrared spectrum shows that the curing reaction of the epoxy resin proceeds effectively at the medium and high temperatures.With increasing the curing temperature and the content of curing agent A,the mechanical property of cured epoxy resin improves.When the waiting-on-cement(WOC)time is 1-2 h,the compressive strength and Young’s modulus of the cured epoxy resin at medium temperature are 119 and 729 MPa,respectively;those of cured epoxy resin at high temperature are 239 and 1049 MPa,respectively.This study suggests that diluted epoxy resin curing system is successfully established,and its curing behavior and performance can be effectively controlled by changing content of curing agents.Then,we studied the performance of diluted epoxy resin curing system in practical environments.Performance of cured epoxy resin in water or kerosene is slightly distinct from that in the atmosphere,implying good performance stability in special environments.The epoxy resin system can be mixed homogeneous with quartz sand and oil well cement,showing good compatibility performance.Meanwhile,it displays good bondability to rock core and stainless steel sheet;the bonding strengths at 60 and 140℃ are 5.13 and 7.89 MPa,respectively.This study shows that the cured epoxy resin system in different environments possessed excellent performance,which can be used in combination with various materials.Finally,waterborne modification of diluted epoxy resin curing system and its application in sand consolidation were studied.We find that epoxy resin system can be emulsified by the Tween80/Span80 compound emulsifiers with specified hydrophilic-lipophilic balance value forming a stable and homogeneous solution with good storage stability.The curing effect of the three curing agents,including A,C,and D,was investigated in the water environment.It is found that curing agent A exhibits best mechanical property and fastest curing rate.Compressive strength and permeability of the cured sand pillars were evaluated comprehensively;the cured sand pillars were prepared through curing the epoxy resin emulsion with the three curing agents at 60℃.The sand pillar cured with curing agent A shows excellent sand consolidation property,and has compressive strength and permeability of 1.82 MPa and 0.025 D,respectively.This indicates that the diluted epoxy resin curing system can be well used in the sand consolidating situations.Mechanical strength and permeability of the optimal sand consolidating system at different temperatures and water contents were studied.It shows that the performance of the sand-consolidating system remains stable at different temperatures and water contents,which can be applied in the practical sand consolidating situations.更多还原