高超,曾一兵,吴晓峰,范海波,赵璐露.硅溶胶改性及其对水性硅橡胶涂料的补强作用[J].表面技术,2018,47(5):148-153.
GAO Chao,ZENG Yi-bing,WU Xiao-feng,FAN Hai-bo,ZHAO Lu-lu.Modification of Silica Sols and Its Reinforcing Effects on Water-based Silicone Rubber Coatings[J].Surface Technology,2018,47(5):148-153 |
| 硅溶胶改性及其对水性硅橡胶涂料的补强作用 |
| Modification of Silica Sols and Its Reinforcing Effects on Water-based Silicone Rubber Coatings |
| 投稿时间：2017-12-06 修订日期：2018-05-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.05.022 |
| 中文关键词: KH-560 改性硅溶胶 空间排斥力 储存稳定性 水性硅橡胶涂料 力学性能 |
| 英文关键词:KH-560 modified silica sols volume exclusion effect storage stability water-based silicone coatings mechanical properties |
| 基金项目: |
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| Author | Institution |
| GAO Chao | Aerospace Research Institute of Materials & Technology, Beijing 100076, China |
| ZENG Yi-bing | Aerospace Research Institute of Materials & Technology, Beijing 100076, China |
| WU Xiao-feng | Aerospace Research Institute of Materials & Technology, Beijing 100076, China |
| FAN Hai-bo | Aerospace Research Institute of Materials & Technology, Beijing 100076, China |
| ZHAO Lu-lu | Aerospace Research Institute of Materials & Technology, Beijing 100076, China |
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| 中文摘要: |
| 目的 改善硅溶胶的储存稳定性，提高水性硅橡胶涂料的强度。方法 将硅烷偶联剂KH-560缓慢加入硅溶胶中，60 ℃下缓慢搅拌，使其建立化学键。通过体系pH值及宏观形态变化对其改性机理进行分析，并对改性前后的形貌、尺寸、热稳定性、Zeta电位和冻融稳定性等进行表征。将改性硅溶胶和耐热纤维加入自制的硅橡胶乳液中，制备水性硅橡胶涂料，对固化后涂层的拉伸强度、断裂伸长率、拉剪强度及拉开强度进行测试，考察改性硅溶胶的补强作用。结果 KH-560的甲氧基与硅溶胶粒子表面的silica-O或silica-OH反应，建立新的Si—O—Si键，增大了硅溶胶粒子的空间排斥力，双电层效应减弱。改性硅溶胶经历5次冻结—融化循环仍能很快恢复胶体状态，且粒子形貌、尺寸及分布没有明显差异。以改性硅溶胶为补强填料，水性硅橡胶涂层的力学强度随硅溶胶添加量的增大而逐渐增强。添加30%硅溶胶时，涂层的拉伸强度为3.03 MPa，断裂伸长率为37.1%，拉剪强度为1.68 MPa，拉开强度为1.85 MPa。结论 硅烷偶联剂KH-560可以有效改善硅溶胶的储存稳定性，改性硅溶胶对水性硅橡胶涂料有很好的补强作用。 |
| 英文摘要: |
| The work aims to improve the storage stability of silica sols and enhance the mechanical properties of water-based silicone rubber coatings. Silane coupling agent, KH-560, was added into silica sols and stirred gently at 60 ℃ to establish chemical bonds. The modification mechanism was analyzed by the change of the pH value and macroscopic morphology. The morphology, size, thermal stability, Zeta potential and freeze-thaw stability were before and after modification were characterized. The modified silica sols and heat-resistant fibers were blended with the self-made silicone emulsions to prepare the water-based silicone coatings. The tensile strength, elongation at break, shear strength and pull strength of the cured coatings were tested to detect the reinforcing effects of silica sols. The methoxy group of KH-560 reacted with silica-O or silica-OH on the surface of silica sol particles to establish new Si—O—Si bonds. The volume exclusion effect of silica sol particles was increased and the double layer effect was weakened. The modified silica sols restored the colloidal state quickly through 5 freeze-thaw cycles. The morphology, size and distribution of particles did not change significantly. With the modified silica sols as reinforcing filler, the mechanical strength of water-based silicone coatings increased as the addition amount of silica sols improved. When 30% silica sol was added, the tensile strength, elongation at break, shear strength, and pull strength of the coatings were 3.03 MPa, 37.1%, 1.68 MPa, 1.85 MPa, respectively. Silane coupling agent KH-560 can effectively improve the storage stability of the silica sols. The modified silica sols have a good reinforcing effect on water-based silicone coatings. |
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