Roles of Reactive Alkenyl Succinic Anhydride (ASA) in Paper Sizing
Roles of Reactive Alkenyl Succinic Anhydride (ASA) in Paper Sizing
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DOI：
10.2115/fiber.52.189
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发表时间：
1996-04
期刊：
影响因子：
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通讯作者：
Masaki Nishiyama;A. Isogai;F. Onabe
中科院分区：
文献类型：
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作者：
Masaki Nishiyama;A. Isogai;F. Onabe
烯基琥珀酸酐（阿萨）作为阳离子阿萨乳液添加到纸浆悬浮液中，可有效地赋予纸张施胶性能。虽然阿萨的活性结构是纸张施胶所必需的，但以前的研究表明，阿萨的水解形式烯基琥珀酸（ASAcid）是ASA施胶纸张中的主要组分。1_？？_。从阿萨和ASAcid的疏水性、聚结性和结晶性等方面研究了反应型阿萨在纸张施胶中的作用。通过对ASA-ASAcid混合乳液抄纸的施胶性能、ASA-ASAcid混合乳液的显微观察、纤维素酶处理后抄纸残渣的X-射线衍射图谱以及ASAcid与阿萨和ASAcid的水滴接触角的测定，结果表明ASAcid具有疏水性，在水介质中具有聚结、分散和结晶行为。阿萨和ASAcid之间的这些性质差异可能导致以下关于使用反应性阿萨乳液的有效纸张施胶机理的假设：（a）阿萨的反应性结构对于在造纸过程中在亲水性纸浆纤维上实现具有较小的亲水性结构的浆料组分的充分分布状态是必需的，（B）形成疏水性更强的ASAcid分子，而不会在造纸干燥过程中可能形成大的疏水结构，保持充分分布的状态，和（c）因此通过在纸浆纤维上充分分布ASAcid分子，在ASA施胶的纸张上有效地出现施胶特征。
Alkenyl succinic anhydride (ASA) gives sizing features efficiently to papersheet by being added to pulp suspensions as cationic ASA emulsions. Although the reactive structure of ASA is necessary for paper sizing, the previous paper revealed that alkenyl succinic acid (ASAcid), the hydrolyzed form of ASA, is the predominant component present in ASA-sized papersheet _??_1_??_. Then the roles of reactive ASA in paper sizing were studied in terms of hydrophobicity and coalescent and crystallizing behavior of ASA and ASAcid. The results obtained by sizing features of handsheets prepared with ASA-ASAcid-mixed emulsions, microscopic observations of the ASA-ASAcid-mixed emulsions, X-ray diffraction patterns of cellulase-treated residue of handsheets and apparent contact angles of water drops on ASA and ASAcid showed that ASAcid is hydrophobic and has coalescent, coagulating and crystallizing behavior in aqueous media, compared with ASA. These differences in properties between ASA and ASAcid may lead to the following hypothesis of mechanisms of efficient paper sizing with reactive ASA emulsions; (a) the reactive structure of ASA is necessary for achieving sufficiently distributed states of size components with smaller coagulating structures on hydrophilic pulp fibers in the papermaking process, (b) then more hydrophobic ASAcid molecules are formed without forming large coagulating structures probably during drying process of papermaking, maintaining the sufficiently distributed states, and (c) thus sizing features appear efficiently on ASA-sized papersheet by sufficiently distributed ASAcid molecules on pulp fibers.