蓖麻油硅氧烷双重交联改善水性聚氨酯的耐水性

Improving Water Resistance of Waterborne Polyurethane by Double Crosslinking Using Castor Oil and 3-Aminopropyltriethoxysilane as Crosslink Agents

以苯酐聚酯多元醇、二羟甲基丙酸和甲苯二异氰酸酯为主要原料,选用蓖麻油及3-氨基丙基三乙氧基硅烷(KH-550)为交联剂,通过预聚物的合成和水相扩链两步反应,制备了水性聚氨酯,研究了蓖麻油和KH-550用量对水性聚氨酯力学性能、附着力和吸水率等的影响。结果表明,当蓖麻油质量分数为10%、KH-550质量分数为1%,经过双重交联改性,水性聚氨酯成膜物具有较好耐水性,其吸水率从34.3%下降到5.7%,可以用于体育场地铺装材料。

Polyester waterborne polyurethane dispersion （WPU） was synthesized with benzoic acid anhydride polyester polyol, dimethylolpropionic acid （DMPA） and 2, 4-diisoeyanatotoluene （TDI） as raw materials, respectively. Water resistance of WPU was improved evidently by double crosslink method, which using castor oil and 3- aminopropyhriethoxysilane （KH-550） as crosslink agents. The effects of the amount of castor oil and KH-550 on the properties of the emulsion and cast film were discussed. The results showed that in the process of synthesizing polyester WPU, the suitable amount of castor oil and KH-550 were 10% and 1% , respectively. After double crosslinking modification, WPU film with good water resistance was obtained, and water absorption of cast film could be decreased from 34. 3 % to 5.7 %. The WPU film could be used as paving materials in sport field.