聚氨酯的毕业论文

聚氨酯的制备及其力学性能研究

摘要

聚氨酯(polyurethane, PU)是聚氨基甲酸酯的简称，是指由多元异氰酸酯和多元羟基化合物通过逐步加成得到的具有氨基甲酸酯基团重复结构单元的聚合物。

硬质聚氨酯泡沫塑料(rigid polyurethane foam, RPUF)是指在一定的负荷作用下不发生变形，当负荷大时发生形变后不再恢复到原来形状的聚氨酯泡沫塑料，RPUF具有优良的力学性能、较高的比强度、良好的冲击吸能特性以及隔热和绝热性能，作为结构支撑、减震缓冲以及隔热保温材料等领域有重要应用。

双缩脲试剂本文用一步法制得了全水发泡硬质聚氨酯泡沫塑料，研究了基础原料对其泡孔结构及力学性能的影响，发现提高异氰酸酯指数，制得硬泡的密度增大，压缩强度提高；发泡体系的乳白时间、上升时间和脱粘时间随着催化剂（二月桂酸二丁基锡）添加量的增多而缩短，制得硬泡的密度和压缩强度降低；硬泡的密度，强度随着交联剂（三乙醇胺）添加量的增加而变大；随着聚醚多元醇的羟基值的增加，值得硬泡的强度增加；随着泡沫稳定剂（8868）添加

量的增加，气泡变小，更加致密，更加均匀；硬泡的密度和压缩强度随着发泡剂（水）的增加而降低。

关键词牛田洋事件：聚氨酯聚醚多元醇多异氰酸酯二月桂酸二丁基锡三乙醇胺水

Abstract

Polyurethane (polyurethane, PU) is by the multi-isocyanate andmulti-hydroxy compounds by the gradual addition of the carbamate groups of repeating structural unit of the polymer.武汛

塘沽二中心小学

Rigid polyurethane foam (rigid polyurethane foam, RPUF) not deform under load effect, no longer revert to the polyurethane foam of original shape after deformation when the load is large, PPUF with excellent mechanical properties, high specific strength, good impact energy absorption characteristics insulation and thermal insulation performance, as the field of structural support, cushioning buffer and thermal insulation materials have important applications.

膜技术的应用易白沙 In this paper, step synthesis made the whole water-blown rigid polyurethane foam, we study the basic raw material the foam structure and mechanical properties. Rigid foam density and compressive strength increase with improving of isocyanate index. The foam system cream time, rise time and debonding with the catalyst (dilauratedibutyltin) the amount of the increase in shortening too rigid foam density andcompressive strength lower. The degree of crosslinking of the hard foam, density, intensity of cross-linking agent (triethanolamine) increase in the amount of change. With the increase of the polyether polyol of hydroxyl value, it is worth the intensityincrease of the rigid foam. As the foam stabilizer(8868) add the amount of the increase, the bubbles become smaller, more compact, more uniform. Rigid foam density and compressive strength decreases with increasing blowing agent(water).

Key words： Dilaurate dibutyltin polymer polyol Polyether polyols Polyisocyanate polyurethane Triethanolamine Distilled water

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