摘要
以聚酯POL 2016、聚醚PPG 330N、异氰酸酯MT、MDI 100LL、交联剂乙二醇、TMP等为主要原料,采用半预聚物法制备聚氨酯微孔弹性体.研究了在MT/MDI 100LL体系中各种助剂的用量或种类对聚氨酯微孔弹性体力学性能的影响.随着固化剂TMP用量的增加,微孔弹性体的拉伸强度、100%定伸应力先升后降;而回弹性先稍有降低后升高,扯断伸长率则呈先降后升再降的趋势.当固化剂 TMP的加入量为 A组分中多元醇质量的1.5%时,试样的综合性能较好.发泡剂用量增加,微孔弹性体的机械强度、回弹性先剧烈下降,当用量大于 2%时又略有上升或下降缓慢.泡沫稳定剂用量增加,微孔弹性体的机械强度和回弹性均升高,扯断伸长率也稍有升高.催化剂用量增加,微孔弹性体的力学性能下降而工艺性能提高,因此应控制催化剂的用量.
The cellular polyurethane elastomer is fabricated out of such raw materials as the polyester(POL-2016),polyether (PPG-330N),isocyanate (MT/MDI-100LL),EG,TMP,etc by means of quasi-prepolymerization method.The effects of different types or amounts of various auxiliary agents such as TMP,vesicant,foam-stabilizer,and catalyst on mechanical properties of concerned elastomer is investigated.With the amount of crosslinking agent/curing agent TMP increased,the tensile strength and the stress at a given 100 percent tensile strain of this cellular elastomer increases first and then decreases,the resilience/resiliency decreased slightly at first and then increases,and the rupture elongation decreases at first,then increases,and decreases again.When the addition amount of crosslinking agent/curing agent TMP becomes 1.5% of the mass of polylol in the composition group A,the comprehensive properties of sample are better.The increase of addition amount of foaming agent makes the mechanical strength and the resilience/resiliency of cellular elastomer decreased violently at first and,when that amount becomes greater than 2%,it increased slightly or decreased slowly.The increase of foam-stabilizer would make both the mechanical strength and resilience/resiliency increased and the elongation at break also increased slightly.The increase of catalyst amount would make mechanical performances decreased and,however,the technological ones improved,so that its addition amount should be controlled.
出处
《兰州理工大学学报》
CAS
北大核心
2005年第1期35-38,共4页
Journal of Lanzhou University of Technology
基金
甘肃省自然科学基金(ZS021 A25 028 C)
关键词
聚氨酯
微孔
弹性体
助剂
力学性能
polyurethane
microhole
elastomer
auxiliary agent
mechanical properties
