Open AccessTHE CONVERSION OF THE MOISTURE-STABILITY WASTE-PAPERS WITH POLYMERIC COVERING. 2. CHAR-ACTERISTIC OF THE WASTE PAPER
Author(s) -
Алашкевич Юрий Давыдович,
Пен Роберт Зусьевич,
Каретникова Наталья Викторовна,
Чендылова Лариса Валерьевна,
Кожухов Виктор Анатольевич,
Воронин Иван Андреевич
Publication year - 2020
Publication title -
himiâ rastitelʹnogo syrʹâ
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.2
H-Index - 6
eISSN - 1029-5151
pISSN - 1029-5143
DOI - 10.14258/jcprm.2020025638
Subject(s) - sodium hydroxide , black liquor , pulp (tooth) , moisture , char , grind , pulp and paper industry , chemistry , materials science , chemical engineering , paper mill , kraft process , pulp mill , waste management , composite material , effluent , lignin , kraft paper , organic chemistry , coal , grinding , engineering , medicine , pathology
Influence of the thermochemical processing (the cook) conditions and of the milling on characteristic of the waste paper with polyurethan and polyaziridin was studied. The waste paper was reduced to the degree size of the particles 5...8 mm in mill of the dry grind and chemical processing under higher temperature (to 70 °C) by solution, contain sodium persulfate and hydroxide; duty of water 6. Duration of cook varied from 1 to 5 hours, expense of persulfate sodium varied from 2 to 12%, hydroxide sodium – from 0.5 to 3% from mass of the waste-papers. The secondary fiber was obtaining by breaking-up of the pulp in the hydropulper. The dependency of the length and factor of the form of the secondary fiber from conditions cook was absent. The slight width increasing of the fibers with the higher pH of cooking liquor was determined: from 26.5 мкм under pH 3–4 to 29 мкм under pH 8–9. The conjectural reason is swelling of the cell wall. The waste paper milling was executed in the «stream-barrier» machine. The strength properties of the paper correspond with the feature, inherent of the secondary pulp.