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| Preparation of Waterborne Blocked Isocyanate Crosslinking Agent and Its Application in Surface Sizing |
| Received:June 18, 2021 |
| DOI：10.11981/j.issn.1000-6842.2022.01.08 |
| Key Words:blocked isocyanate;surface sizing;folding endurance;tensile index |
| Fund Project:陕西省科技统筹创新工程重点实验室项目（2013SZS10-Z01）。 |
| Author Name | Affiliation | Postcode | | YANG Bo | School of Chemistry and Chemical Engineering， Shaanxi University of Science and Technology， Xi'an， Shaanxi Province， 710021
Shaanxi Provincial Key Laboratory of Light Chemical Additives， Xi'an， Shaanxi Province， 710021 | 710021 | | LI Xiaorui | School of Chemistry and Chemical Engineering， Shaanxi University of Science and Technology， Xi'an， Shaanxi Province， 710021
Shaanxi Provincial Key Laboratory of Light Chemical Additives， Xi'an， Shaanxi Province， 710021 | 710021 | | LIU Yihe | School of Chemistry and Chemical Engineering， Shaanxi University of Science and Technology， Xi'an， Shaanxi Province， 710021
Shaanxi Provincial Key Laboratory of Light Chemical Additives， Xi'an， Shaanxi Province， 710021 | 710021 | | DUAN Yerui | School of Chemistry and Chemical Engineering， Shaanxi University of Science and Technology， Xi'an， Shaanxi Province， 710021
Shaanxi Provincial Key Laboratory of Light Chemical Additives， Xi'an， Shaanxi Province， 710021 | 710021 | | MIAO Yi | PetroChina Changqing Oilfield Company No. 7 Oil Production Plant， Xi'an， Shaanxi Province， 710016 | 710016 |
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| Abstract: |
| The polyurethane prepolymer， prepared through one-step method using isophorone diisocyanate （IPDI） and 1，4-butanediol （BDO） as raw materials， 2，2-dimethylolpropionic acid （DMPA） as chain extender， and N-methyl-2-pyrrolidone （NMP） as solvent， and further blocked by 2-butanone oxime （MEKO）， was eventually neutralized using organic base and emulsified with water to prepare a waterborne blocked isocyanate crosslinking agent （WBIC）； which was compounded with polyvinyl alcohol （PVA1799） to size paper at certain temperature and unblocking reaction was subsequently conducted at ~110℃. Fourier Infrared Spectroscopy （FI-TR）， thermogravimetric analysis （TGA）， and emulsion stability tests were conducted to analyze the structure and stability of the prepared samples， and physical properties of the sized paper were tested as well. The results showed that the prepared emulsion was stable with the smallest particle size of 85.14 nm， polymer dispersion index （PDI） of 0.171 when R value （—NCO/—OH） was 1.8 and MEKO used as blocking agent. Compared with base paper， physical properties of the sized paper increased greatly with folding endurance， tensile index， stiffness， tearing index， and bursting index increased by 57.6%， 29.1%， 165.4%， 31.0%， and 59.0%， respectively； the contact angle of sized paper was 96°. |
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