Preparation and characterization of tung oil-rosin-based polyester internal sizing agent

Yazhou Xu; Songlin Dai; Liangwu Bi; Yuxiang Chen

doi:10.1515/npprj-2021-0033

Article

Preparation and characterization of tung oil-rosin-based polyester internal sizing agent

Yazhou Xu , Songlin Dai , Liangwu Bi and Yuxiang Chen

Published/Copyright: June 23, 2021

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From the journal Nordic Pulp & Paper Research Journal Volume 36 Issue 3

Abstract

A series of tung oil-rosin-based polyester (TRP) used as internal sizing agents were prepared using rosin, tung oil, maleic anhydride, and glycerol. TRP structure and properties were examined using Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and gel permeation chromatography (GPC). The TRP latexes were subsequently used as internal sizing agents, and the sizing properties were evaluated using a scanning electron microscope (SEM), a video-based dynamic contact angle measuring device and a Cobb absorbency tester. The optimal conditions for preparing the TRP sizing agent were as follows: the hydroxy-carboxyl ratio of the material was 0.25; the maleic anhydride dosage was 20 % of rosin; and the tung oil dosage was 40 % of rosin. Under the best conditions, the sized paper Cobb-60 was 15.6 g / m 2 , the tensile index was 45.1 N·m/g, the burst index was 3.1 kPa· m 2 /g, and the tear index was 15.6 mN· m 2 /g.

Keywords: internal sizing; polyester; rosin; tung oil; water resistance

Funding source: National Key Research and Development Program of China

Award Identifier / Grant number: 2016YFD0600804

Funding statement: This research was financially supported by grants from the National Key R&D Program of China (Grant No. 2016YFD0600804).

Conflict of interest: The authors declare no conflicts of interest.

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Received: 2021-05-11

Accepted: 2021-05-18

Published Online: 2021-06-23

Published in Print: 2021-09-27

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Articles in the same Issue

https://doi.org/10.1515/npprj-2021-0033

Keywords for this article

internal sizing; polyester; rosin; tung oil; water resistance