淀粉包覆PCC在造纸中的制备与应用研究
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摘要
基于纸张高加填,而同时又对纸页强度影响最小化的原则,本论文采用淀粉胶对PCC浆料颗粒进行包覆的预絮聚处理技术,使PCC颗粒表面生成一层淀粉沉积膜,间接保证纸浆纤维与填料颗粒的良好结合。论文就替代碳酸钙进行抄纸实验和助留助滤实验,研究分析了其作为新型填料对纸张性能和湿部助留助滤性能的影响。
     研究结果表明:阳离子淀粉是一种较好的填料预处理助剂,预絮聚填料可以有效缩短纸料的滤水时间。影响淀粉包覆率的主要因素有淀粉与PCC比例、PCC溶液浓度、包覆时间及包覆剪切力,六偏磷酸钠是一种较为有效的交联剂,红外光谱表明在溶液状态下,它可以和淀粉反应生成P-O-C键,可以较大幅度提高淀粉的包覆率。
     以加填量30%,抄造定量为75g/m2的纸张为例,用预絮聚处理PCC加填纸张灰分可达到21.42%,而采用普通加填工艺的纸张灰分仅18%。用预絮聚填料完全替代普通填料加填,浆内在湿部淀粉添加量为1%时,与使用同样加填量的普通填料相比灰分提高2.7%,抗张指数提高4.17%,耐破指数提高19.7%。纸张的不透明度略有下降。AKD施胶时,AKD用量为0.3%时,Cobb值下降29.6%。
     在CPAM用量0.01%时,经交联处理后的预絮聚PCC表现出较好助留助滤效果,交联预絮聚PCC有良好的抗剪切能力,在加填30%的条件下,0.04%的CPAM用量和0.2%的膨润土用量较为经济和高效,滤水时间比普通PCC降低3.1秒,纸料留着率比普通PCC提高2.16%。
Based on the high filler content in paper and the low effect to the paper strength,the thesis coated starch on PCC with the preflocculation technology and made the surface of PCC generate a starch layer to make sure the fiber and the filler particle got a good combination. The thesis researched the paper characteristic filled with starch coated PCC and their retention and drainage characteristic in wet end as a new kind of filler substitute for common PCC.
     The result of the research reveals that cationic starch is a kind of appropriate pretreated agent; it can reduce the drainage time effectively. The influence factor to the starch coated rate of PCC is the ratio of starch to PCC,the PCC solution concentration, the reaction time and the shearing force in reaction. Sodium hexametahposphate is a kind of appropriate cross-linking agent and it can increase the starch coated rate effectively.The infrared spectrum showed that sodium hexametahposphate can reaction with starch with P-O-C bond in solution.
     Take the 75g/m2 paper filled with 30% PCC for example,the ash of paper with starch coated PCC can reach 21.42% compared 18% ash in paper with common technics.adding 1% starch in wet end,the ash of paper with starch coated PCC raise 2.7% than common PCC, tensile index raise 4.17% than common PCC, burst index raise 19.7% than common PCC.the opacity of paper with starch coated PCC decrease slightly.when 0.3% AKD was used to papermaking,Cobb index decreased 29.6% compare paper with common PCC .
     When 0.01% CPAM was used to papermaking, the cross linked starch coated PCC showed good retention and drainage characteristic and relative good anti-shearing characteristic.under 30% filler adding condition, 0.04%CPAM and 0.2% bentonite is appropriate to retention and drainage time. The drainage time decreased 3.1s than paper with common PCC and the retention rate increase 2.16% than paper with common PCC.
引文
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