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以聚丙二醇(N-220)和异佛尔酮二异氰酸酯(IPDI)为主要原料、二羟甲基丙酸(DMPA)和聚乙二醇(PEG)为亲水性物质、三乙胺为中和剂,制备出一种具有压敏特性的水性聚氨酯(WPU)胶粘剂。通过红外光谱(FT-IR)法、粒度分析法等检测手段,研究了DMPA、PEG、中和剂、增黏树脂和交联剂等对WPU的结构和性能的影响。结果表明:亲水性基团含量越少,产物粒径越大,耐水性越好;中和度越低,WPU胶膜的耐水性越好,同时可供交联的羧基含量越多;当中和度为33.3%、w(固化剂)=1.5%时,WPU压敏胶带的内聚强度较大且不脱胶,其吸水率为31.2%,180°剥离强度为2.2N/25mm,可望在保护膜胶带等领域中得到应用。
Using polypropylene glycol (N-220) and isophorone diisocyanate (IPDI) as the main raw materials, dimethylolpropionic acid (DMPA) and polyethylene glycol (PEG) And agent to prepare a pressure-sensitive water-based polyurethane (WPU) adhesive. The effects of DMPA, PEG, neutralizing agent, tackifying resin and crosslinking agent on the structure and properties of WPU were studied by means of FT-IR and particle size analysis. The results showed that the smaller the content of hydrophilic groups, the larger the product size, the better the water resistance; the lower the degree of neutralization, the better the water resistance of the WPU film and the more the carboxyl groups available for cross-linking; And degree of 33.3%, w (curing agent) = 1.5%, WPU pressure-sensitive adhesive tape with greater cohesive strength and not degumming, the water absorption was 31.2%, 180 ° peel strength of 2.2N / 25mm, is expected to Protective film tape and other fields have been applied.