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首页> 外文期刊>Polymers for advanced technologies >Ambient curable latex films and adhesives based on natural rubber bearing Acetoacetoxy functionality
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Ambient curable latex films and adhesives based on natural rubber bearing Acetoacetoxy functionality

机译：基于天然橡胶轴承乙酰乙酰氧基功能的环境可固化胶乳膜和粘合剂

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摘要

The study described in this paper first demonstrates that a newly modified form of natural rubber, namely graft copolymers of natural rubber with poly (acetoacetoxyethyl methacrylate), NR-g-PAAEM, is able to undergo a cross-linking reaction at room temperature by reaction with a water dispersible polyisocyanate based on hexamethylene diisocyanate (poly-HDI). Attenuated total reflectance Fourier transform infrared (ATR-FTIR) analysis indicated that amide groups were formed by the reaction of the acetoacetyl groups (AcAc) present in the grafted poly (acetoacetoxyethyl methacrylate) (PAAEM) chains with the poly-HDI. This observation was accompanied by a noticeable increase in the tensile strength of the NR-g-PAAEM latex films when adding poly-HDI to the latex prior to film formation. DMTA analyses also revealed a shift in the tan delta peaks, corresponding to the transitions of both NR-g-PAAEM and free PAAEM phases, to higher temperatures. These results provide firm evidence of cross-linking between NR-g-PAAEM chains by reaction with poly-HDI during film formation under ambient conditions. Adhesives for bonding wood to wood based on the NR-g-PAAEM latex were then prepared, using poly-HDI as the cross-linker. The lap shear strength of the resulting adhesives exhibited a maximum value of 2657 KPa when a poly-HDI:AAEM molar ratio of 3:1 was employed. It was also observed that the adhesive attained about approximately 89% of the highest lap shear strength after it was allowed to set at 30 degrees C for 24 hours. Hence, the use of poly-HDI in cross-linking NR particles bearing grafted PAAEM offers great potential for developing latex adhesives and coatings capable of curing under ambient conditions.
机译：本文中描述的研究首先表明了一种新改性的天然橡胶形式，即具有聚（乙酰乙酰氧基甲基丙烯酸甲酯），NR-G-Paaem的天然橡胶的接枝共聚物，能够通过反应在室温下进行交联反应用基于六亚甲基二异氰酸酯（Poly-HDI）的水分散性多异氰酸酯。减弱的总反射率傅里叶变换红外（ATR-FTIR）分析表明，通过将接枝的聚（乙酰乙酰甲基甲基丙烯酸甲酯）（Paaem）链中存在的乙酰乙酰基（ACAC）与Poly-HDI的链条反应形成酰胺基团。当在膜形成之前将Poly-HDI加入胶乳时，该观察结果伴随着NR-G-Paaem胶乳膜的拉伸强度的显着增加。 DMTA分析还揭示了TAN DELTA峰的偏移，对应于NR-G-PAAEM和免费PAAEM相的转变，更高的温度。这些结果提供了通过在环境条件下的膜形成期间与聚HDI反应在NR-G-Paaem链之间交联的坚实证据。然后使用Poly-HDI作为交联剂，制备用于基于NR-G-Paaem胶乳的木材粘合到木材的粘合剂。当Poly-HDI时，所得粘合剂的膝剪切强度显示出最大值2657kPa：Aaem摩尔比为3：1。还观察到，在使其在30℃下24小时后，粘合剂在允许在30℃下达到最高腿部剪切强度的约89％。因此，在交联的NR颗粒中使用聚HDI轴承接枝的Paaem提供了在环境条件下开发乳胶粘合剂和涂层的巨大潜力。

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