Strength Properties of Water Resistant Papers Prepared from Carbamoylethylated Pulps and the Water-resistance Improving Mechanism

氨基甲酰乙基化浆制备的耐水纸的强度性能及耐水性提高机理

• 批准号: 07660215
• 负责人: SUZUKI Kyoji
• 金额: $ 1.34万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07660215/
• 关键词: Water-resistant paper; Carbamoylethylation; N-chlorination; Wet strength; N-Cl基; シアノエチル化; アルバモイルエチル化; N-塩素化

Water-resistant paper derived from carbamoylethylated pulp was prepared, and some mechanical properties, repulping conditions and the water-resistance improving mechanism were investigated. Chemical modification of pulps was carried out by the following three steps :(1) P-OH+CH_2=CH-CN * P-O-CH_2-CH_2-CN (where P is pulp fiber)(2) P-O-CH_2-CH_2-CN+H_2O_2 * P-O-CH_2-CH_2-CONH_2(3) P-O-CH_2-CH_2-CONH_2+NaC1O * P-O-CH_2-CH_2-CON^-C1Wet-and dry-tensile strength of N-Chlorinated pulp (N-Cl-P) sheets was highly improved compared to that of untreated pulp sheets. Especially, wet tensile strength of N-Cl-P sheets with DS 0.04 was nearly equal to the dry tensile strength of corresponding untreated pulp sheets. Folding endurance, burst strength, brightness and dimentional stability were also improved by N-Chlorination of Carbamoylethylated pulp. The main mechanism of water-resistance improvement is considered to be the formation of interfiber urea bonding. The hypochlorite treatment in an alkaline medium was effective for reducing the wet strength to be able to repulp. Strength properties of the recycled sheets from the repulping pulp were fairly good when N-Cl-P sheets were treated with the lowest amount of hypochlorite within possible defibering without heating.

以氨甲酰乙基化浆为原料，制备了抗水性纸，并对其力学性能、再制浆条件及抗水性改善机理进行了研究。纸浆的化学改性按以下三个步骤进行：（1）P-OH+CH_2=CH-CN * P-O-CH_2-CH_2-CN（其中P为纸浆纤维）（2）P-O-CH_2-CH_2-CN+H_2O_2 * P-O-CH_2-CH_2-CONH_2（3）P-O-CH_2-CH_2-CONH_2+ NaClO * P-O-CH_2-CH_2-CON^-Cl ~-Cl ~-Cl特别是DS为0.04的N-Cl-P浆片的湿抗张强度与相应的未处理浆片的干抗张强度几乎相等。氨甲酰乙基化浆经N-氯化处理后，耐折度、耐破强度、白度和尺寸稳定性也得到改善。纤维间脲键的形成是纤维耐水性提高的主要机理。在碱性介质中的次氯酸盐处理对于降低湿强度以能够再制浆是有效的。当N-Cl-P片材用最低量的次氯酸盐处理时，在不加热的情况下，在可能的除杂范围内，来自再制浆纸浆的回收片材的强度性能相当好。

项目成果

Kyoji, Suzuki: "Strength Properties of Water Resistant papers Prepared from N-Cglorinated Pulps and the Water-Resistance Improving Mechanism" Annals of the High Performance Paper Society, Japan. No.33. 31-36 (1995)

Kyoji, Suzuki：“由氯化纸浆制备的耐水纸的强度特性和耐水性改进机制”日本高性能纸协会年鉴。