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| Internal Sizing of the Stock Containing PAE/CMC Dual-polymer Strengthening System with Styrene-acrylic Emulsion |
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| DOI：10.11980/j.issn.0254-508X.2011.09.004 |
| Key Words:styrene-acrylic emulsion internal sizing PAE CMC charge ratio |
| Fund Project:本课题得到天津市科技发展项目（项目编号06YFGZGX03900）资助。 |
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| Abstract:In this paper, the efficiency of styrene-acrylic emulsion as internal size was discussed when both cationic polyelectrolyte polyamideamine epichlorohydrine (PAE) and anionic poly-electrolyte carboxymethyl cellulose(CMC) were added as strength additives in the papermaking process. The added amount of styrene-acrylic emulsion had a remarkable effect on internal sizing and paper strength. When the dosages of PAE and CMC were constant, and breaking length increased while tear index decreased. Raised amount of PAE could improve sizing degree, but CMC had an adverse effect on sizing degree. Therefore, when PAE/CMC dual-polymer strengthening system and styrene-acrylic emulsion are added simultaneously into stock, electric charge ratio of PAE and CMC is the key factor influencing the internal sizing efficiency of styrene-acrylic emulsion. Sizing degree rapidly increases with the increase of charge ratio of PAE to CMC in the range of 1.5 to 4.0, then begin to level off. The sizing degree is 90% of the control sample when the charge ratio of PAE to CMC is 8.0. |
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