【作者】 袁广翔；

【导师】 戴红旗；

【作者基本信息】 南京林业大学 ， 制浆造纸工程， 2008， 硕士

【摘要】 造纸湿部系统中无机盐的积累,将严重削弱CPAM的助留助滤效率。CPAM是阳电荷密度低、分子量大的线性高分子,易受到高电导率作用而产生卷曲;PDADMAC电荷密度高,但较低的分子量限制了它的助留功能。因此,本论文根据CPAM分子量高、PDADMAC阳电荷密度强与抗盐性好的特点,采用DADMAC与AM单体经水相聚合得到了MPAM助留助滤剂,并对其助留助滤性能及环境适应性进行了应用研究。主要研究结果如下:MPAM助留助滤剂的制备工艺条件为:反应温度700C、AM和DADMAC摩尔比1∶1、单体浓度50%和引发剂用量0.25%。MPAM共聚物的粘均分子量达86.88万,如采取连续添加AM单体的方式,产物粘均分子量150.1万、电荷密度达到2.60 meq/g。在较宽的pH范围、高电导率含量下,MPAM的阳电荷密度基本保持在2.6meq/g左右。MPAM与CPAM进行助留助滤性能对比表明:pH从3升高至9,MPAM对纸料留着率由77.91%下降到72.43%,浆料游离度由345ml下降到290ml;而同样条件下,商品CPAM对纸料留着率和游离度则由79.12%和355ml分别下降到65.51%和270ml。当浆料中由不含无机盐提高到电导率为5140us/cm时,MPAM对纸料的留着率和浆料游离度从73.03%和290ml下降到71.52%和250ml;而同样条件下,商品CPAM对纸料留着率和浆料游离度由75.1%和340ml分别下降到了68.61%和210ml。当DCS含量提高到1%时,MPAM对纸料留着率和浆料游离度仅从73.03%和290ml下降到67.69%和265ml;而使用商品CPAM对纸料留着率和游离度则从75.1%和340ml下降到61.43%和240ml。因此,尽管MPAM相对CPAM的分子量低、对纸料的初始助留助滤性能略低,但在较高的无机盐含量及较大的DCS量环境下具有优良的助留助滤性能。更多还原

【Abstract】 Accompany with the enhancement of inorganic salt in the wet-end, there comes the decreasing in retention and drainage capacity of CPAM. CPAM is a kind of linear macromolecule that has low positive charge density, high molecular weight. It is easy to become curling by the effect of high electrical conductivity. PDADMAC has high positive charge density, but its retention application is restricted by the low molecular weight. In this paper, retention and drainage agent MPAM was prepared by aqueous phase polymerization of DADMAC and AM, it incorporated the advantage of CPAM and PDADMAC. At the same time, this paper was investigated the retention and drainage effects of MPAM and its environment compatibility. Main results as follows:At 700C, nAM∶nDMDAAC=1∶1, the concentration of DADMAC and AM was 50%, the dosage of initiator AIBA·2HCl was 0.25%, the relative molecular weight of MPAM was 868,800. If continuous feeding of AM was used, the relative molecular weight of MPAM could attain 1,501,000, and the cationicity viscosity could attain 2.60meq/g.In the wide extension of pH value, high conductivity, MPAM with relative molecular weight of 1,501,000 basically maintain the positive charge density approximately in 2.6meq/g. The comparison of both MPAM and CPAM in retention and drainage effect indicated that: When the pH value raised from 3 to 9, the retention and the Canadian Standard Freeness of stock using MPAM has reduced form 77.91% and 345ml to 72.43% and 290ml. In the same time, the retention and the Canadian Standard Freeness of stock using commercial CPAM has reduced form 79.12% and 355ml to 65.51% and 270ml. When the stock was fluctuated between inorganic salt free and conductivity was 5140us/cm, the retention and the Canadian Standard Freeness of stock using MPAM has reduced form 73.03% and 290ml to 71.52% and 250ml. In the same range, the retention and the Canadian Standard Freeness of stock using commercial CPAM has reduced form 75.1% and 340ml to 68.61% and 210ml. When the DCS consistency was 1%, the retention and the Canadian Standard Freeness of stock using MPAM with relative molecular weight of 1,501,000 has reduced form 73.03% and 290ml to 67.69% and 265ml. In the same time, the retention and the Canadian Standard Freeness of stock using commercial CPAM has reduced form 75.1% and 340ml to 61.43% and 240ml.So MPAM’s molecular weight was lower than CPAM, the retention and drainage ability was weaker, but it had excellent retention and drainage ability when the inorganic salt or the DCS consistency was high.更多还原