低有机氯含量PAE基纸张湿强剂的制备及性能评价

doi:10.16085/j.issn.1000-6613.2021-2640

摘要/Abstract

摘要：

利用二乙烯三胺和己二酸为原料，对甲苯磺酸为催化剂合成聚酰胺，在聚酰胺和环氧氯丙烷的反应中加入三乙胺和阳离子改性剂，反应得到改性聚酰胺环氧氯丙烷（PAE）树脂，将其用作纸张湿强剂，进行浆内施胶得到了改性PAE树脂施胶纸张。通过傅里叶变换红外光谱（FTIR）及溶液稳定性测试对改性PAE树脂的结构和稳定性进行了表征，讨论了温度和三乙胺用量对有机氯含量的影响、三乙胺及阳离子改性剂用量对改性PAE树脂施胶纸张物理性能的影响。结果表明，当温度为50℃、三乙胺用量为7.4%（相对于反应物总质量）、阳离子改性剂用量为24.6%（相对于反应物总质量）时，制备的改性PAE树脂中有机氯含量为0.067%（相对于PAE树脂总质量），低于国家标准规定的0.7%，并可在室温下稳定放置。当改性PAE树脂添加量为质量分数1.6%，其浆内施胶效果最佳，浆内zeta电位为-1.2mV，纸张接触角为63.56°，改性PAE树脂施胶纸张与原纸相比干抗张指数、湿抗张指数、撕裂指数和耐折度分别提高了41%、13%、32.8%和27%，纸张物理性能明显增强。

关键词: 有机氯, 抗张指数, 聚酰胺环氧氯丙烷, 树脂, 湿强剂

Abstract:

Polyamide was synthesized by using diethylenetriamine and adipic acid as raw materials and p-toluenesulfonic acid as catalyst. Triethylamine and cationic modifier were added in the reaction of polyamide and epichlorohydrin to obtain modified PAE resin. It was used as paper wet strength agent and performing internal sizing to obtain modified PAE resin sizing paper. The structure and stability of the modified PAE resin were characterized by Fourier transform infrared spectroscopy (FTIR) and solution stability test. The effects of temperature and triethylamine dosage on the content of organochlorine, triethylamine and cationic modification were discussed. The effect of agent dosage on the physical properties of modified PAE resin sized paper was also analyzed. The results showed that when the temperature was 50℃, the amount of triethylamine was 7.4% (relative to the total mass of the reactants) and the amount of cationic modifier was 24.6% (relative to the total mass of the reactants), the organic chlorine content in the modified PAE resin was 0.067% (relative to the total mass of the PAE resin), which was lower than the 0.7% specified by the national standard, and can be placed stably at room temperature. When the amount of modified PAE resin added was 1.6% by mass, the sizing effect in the pulp was the best, the zeta potential in the pulp was -1.2mV, the contact angle of the paper was 63.56°, and the modified PAE resin sizing paper was dry compared with the base paper. Tensile index, wet tensile index, tear index and folding endurance were increased by 41%, 13%, 32.8% and 27%, respectively, and the physical properties of paper were significantly enhanced.

Key words: organochlorine, tensile index, polyamide epichlorohydrin, resin, wet strength agent

中图分类号:

TS727.2

宋英琪, 沈一丁, 刘勇兵, 党园园. 低有机氯含量PAE基纸张湿强剂的制备及性能评价[J]. 化工进展, 2022, 41(10): 5558-5566.

SONG Yingqi, SHEN Yiding, LIU Yongbing, DANG Yuanyuan. Preparation and performance evaluation of PAE-based paper wet strength agent with low organochlorine content[J]. Chemical Industry and Engineering Progress, 2022, 41(10): 5558-5566.

图/表 13

图1 低有机氯含量PAE的合成机理

图2 单体、聚酰胺和改性PAE树脂的红外光谱图

图3 阳离子改性剂对稳定性的影响

图4 有机氯在气相色谱中的标准曲线

图5 温度对有机氯含量的影响

图6 三乙胺用量对有机氯含量的影响

表1 PAE树脂中有机氯含量对比

样品

DCP

/μg·mL^-1

MCPD

/μg·mL^-1

有机氯质量分数

图7 三乙胺用量对施胶纸张物理性能的影响

图8 三乙胺对纸张接触角的影响

图9 阳离子改性剂对施胶纸张物理性能的影响

图10 改性PAE树脂添加量对浆内zeta电位的影响

图11 改性PAE树脂对纸张热性能的影响

图12 不同施胶纸张的表面形貌

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