婴儿足跟贴用醋酸钠复合相变蓄能材料的制备与性能研究
毕业论文关键词： 相变材料；三水醋酸钠；成核剂；分散剂
Abstract
In this paper, The use of sodium acetate trihydrate (SAT) supersaturated solution in the nucleus to promote transformation under the action of the energy storage mechanism solution. Prepared the materials for baby heel used，By adjusting the solution supersaturation of SAT，The initial temperature of SAT. By adding nucleating agent nine aqueous sodium silicate (Na2SiO3•9H2O) and dispersant sodium carboxymethyl cellulose (CMC) in the solution to improve the slow exothermic model SAT. At the same time, through the microscope observation of SAT’s process changes the crystal nucleus in the nucleation. The results showed that: When the degree of supersaturation of SAT was 4.7, the initial temperature of the solution phase is 43.6℃,suitable for baby use. When adding mass fraction of CMC was 0.031%, the highest temperature is 45.6℃ centigrade heat release, The heat release duration get longer , and the solution stability improved. This is mainly due to the crystal grain size for the smallest into nuclear, dispersant agent can slow down the crystallization rate, prolong the time of heat release.
Key words：phase change materials ;sodium acetate trihydrate; nucleating agent; dispersing agent
目 录
1绪论 1
1.1 相变材料的介绍 1
1.2 相变材料的分类 1
1.2.1 复合相变材料 2
1.2.2 有机相变材料 3
1.2.3 无机相变材料 4
1.3 水合盐类无机相变材料 4
1.3.1 水合盐类无机相变材料的种类 4
1.3.2 水合盐类无机相变材料蓄能机理 5
1.3.3 水合盐类无机相变材的存在问题 5
1.4 相变材料的结晶及其影响因素 6
1.5 相变蓄热材料的应用 7
1.6选题思路 7
2.实验部分 9
2.1 实验原料及实验设备 9
2.2 实验过程 9
2.2.1 SAT过饱和溶液的配制 9
2.2.2 过饱和SAT溶液的过冷化 10
2.2.3 三水醋酸钠溶液的改性 11
2.3 SAT相变蓄热的性能表征 11
2.3.1 SAT溶液的放热 11
2.3.2 结晶速率的测定 12
2.3.3 样品的稳定性观察 12
2.3.4 晶体形貌的观察 12
3.结果与讨论 13
3.1 过饱和的SAT溶液的性质 13
3.1.1 溶剂选择 13
3.1.2 不同过饱和度SAT溶液的放热曲线 13
3.1.3 结晶速率的观察 15
3.1.4 SAT溶液的稳定性测试 16
3.2 CMC对SAT溶液的改性 17
3.2.1 羟甲基纤文素钠的性质 17
3.2.2 不同浓度CMC的过饱和度为4.7的SAT溶液的放热 17
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