巻号一覧
前身誌
44 巻, 8 号
選択された号の論文の7件中1～7を表示しています
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中村 邦雄, 畠山 兵衛1990 年 44 巻 8 号 p. 849-855
発行日: 1990/08/01
公開日: 2009/11/19
ジャーナル フリーNew types of polyurethanes were synthesized from kraft lignin, solvolysis lignin and wood meal by polymerization with polyethylene glycol (PEG) and diphenylmethane diisocyanate (MDI). The results obtained are as follows.
(1) Polyurethane films were made by solvent casting, and their tensile properties were measured. It was found that kraft and solvolysis lignins contributed effectively to an improvement in the mechanical properties of polyurethanes. Polyurethanes of considerable toughness were obtained, under specific conditions of the isocyanate/hydroxyl group ratio (NCO/OH) and also depending on either kraft or solvolysis lignin content. At high kraft and solvolysis contents, the obtained polyurethanes were hard and brittle, regardless of the NCO/OH ratio used in the experiment.
(2) Polyurethane foams were synthesized from a three-component system consisting of PEG, MDI and kraft lignin. Polyurethane foams having kraft lignin contents of up to 40% and apparent densities ranging from 0.04 to 0.22 g/cm3 were prepared by controlling the kraft lignin content, NCO/OH ratio and water content. The compressive strength and elasticity of the polyurethane foams increased with increasing kraft lignin content and NCO/OH ratio.
(3) Polyurethane films and foams, which were synthesized by using wood meal as a raw material, generally showed similar mechanical properties to those of polyurethanes which were synthesized from kraft and solvolysis lignins.抄録全体を表示PDF形式でダウンロード (1113K) -
岩崎 誠1990 年 44 巻 8 号 p. 856-864
発行日: 1990/08/01
公開日: 2009/11/19
ジャーナル フリーPDF形式でダウンロード (1154K) -
大喜多 泰郎, 松原 次男1990 年 44 巻 8 号 p. 865-874
発行日: 1990/08/01
公開日: 2009/11/19
ジャーナル フリーAn organic filler, which is obtained by urea-formaldehyde condensation, has been used to light weight paper in recent years.
It improves brightness and opacity, in addition it has a very high absorptional ability of liquid owing to its porous structure.
A number of industrial benefits, which have not been achieved by common inorganic fillers, are obtained by its use.
These characteristics and paper making uses of its organic filler are discussed in this paper.抄録全体を表示PDF形式でダウンロード (3572K) -
高度な製品品質を求めて飛躍する脱墨技術金沢 毅1990 年 44 巻 8 号 p. 875-890
発行日: 1990/08/01
公開日: 2009/11/19
ジャーナル フリーAikawa has had rich experiences for deinking technology from toilet paper, tissue paper to news papers, printing paper and respond to various deinking requirements. The biggest subject in a deink plant is how to treat difficult deink printed paper and solve sticky problems. The removal of the contaminants by excellent screening facilities without cutting of impurities, …… Aikawa's deink systems are made by various combinations of superior technologies of Helipoire, coarse and fine screening, and light weight impurity cleaner. Difficult deink printed paper, with high brightness and quality deinked pulp can be produced by the combination of superior defibering and ink dispersing accomplished by the Helipoire, Dispersion and deinking by the DA-Verticel.抄録全体を表示PDF形式でダウンロード (15146K) -
その4 板紙抄紙機, オフマシン塗工機, 環境エネルギー委員会1990 年 44 巻 8 号 p. 891-909
発行日: 1990/08/01
公開日: 2009/11/19
ジャーナル フリーPDF形式でダウンロード (2184K) -
田中 浩雄, 山川 一秀1990 年 44 巻 8 号 p. 911-917
発行日: 1990/08/01
公開日: 2009/11/19
ジャーナル フリーCationic polyacrylamide (C-PAM) with the charge density of 2.1 meq/g and the degree of polymerization of 5650 was prepared by the modified Hofmann reaction of PAM. C-PAM was slightly dansylated (fluorescently labeled) in a homogeneous system using aqueous dimethylformamide as solvent. The fluorescent labeling had no effect on the adsorptibity of C-PAM on cellulose fibers.
The adsorption of C-PAM or dansylated C-PAM (DC-PAM) reached the saturation level after only a few days when the concentration of electrolyte was high whereas that continued even after 10 days when the concentration of electrolyte was low. The pre-adsorbed DC-PAM on fibers was exchanged by C-PAM. The exchange reactions proceeded quite rapidly when the contact time between fibers and DC-PAM was short. The exchange became more difficult with increasing contact time. In conclusion, the presented results show that cationic polymer can gradually walk into the pores of fibers by vermiculation.抄録全体を表示PDF形式でダウンロード (866K) -
1990 年 44 巻 8 号 p. 918-926
発行日: 1990/08/01
公開日: 2009/11/19
ジャーナル フリーPDF形式でダウンロード (1478K)
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