Properties of viscose prepared from modified cellulose

Conclusions Some basic characteristics of viscose prepared from radiation-modified cellulose as compared with standard viscose have been determined.It has been shown that viscose from RMC has an increased coagulation resistance and increased physicochemical uniformity as compared with standard viscose of analogous composition.Translated from Khimicheskie Volokna, No. 2, pp. 32–34, March–April, 1990.     

Preparation of integrally spun viscose sausage casings using radiation-modified cellulose

Conclusions The effect of precipitation bath parameters on the physicomechanical properties of integrally spun sausage casings prepared using radiation-modified cellulose has been studied.It has been found that the use of radiation-modified cellulose ensures the possibility of producing a high-quality product with a reduction of the consumption of carbon disulfide in xanthation to 10–15% based on wt. of -cellulose.Ukrainian NIIV (Kiev). Translated from Khimicheskie Volokna, No. 3, pp. 47–49, May–June, 1993.     

Effect of carbon disulfide consumption on the basic properties of viscose prepared from radiation-modified cellulose

Conclusions -- The process of preparing viscose from radiation-modified cellulose using carbon disulfide in the range of 6–32% of the weight of -cellulose in the xanthation has been investigated.-- Equations have been given which describe the dependence of the degree of esterification of the cellulose xanthate, the ripeness index, the byproduct content, the viscosity, and the filterability of the viscoses on CS₂ consumption in xanthation within the range 6–32% by wt.-- It has been found that a decrease in consumption of CS₂ primarily affects the viscosity of the viscoses obtained, and then it affects figures which characterize the content of byproducts, degree of esterification of the cellulose xanthate, ripeness, and the filterability of the spinning solutions.Translated from Khimicheskie Volokna, No. 5, pp. 51–53, September–October, 1991.     

Preparation of viscose by a reverse method,using wet cellulose

Conclusions It is possible to prepare viscose in a single apparatus by treating wet cellulose by the reverse method, in which impregnation with carbon disulfide precedes treatment with a waster solution of caustic soda.Use of the reverse method affords the possibility of preparing a viscose of higher quality as compared with the viscose prepared by the known method, in which either dry or wet cellulose is used.Bulgaria, Translated from Khimicheskie Volokna, No. 5, pp. 52–54, September–October, 1984.     

Properties of silicon-containing carbon fiber materials prepared using cellulose

Silicon-containing carbon fiber sorbents, which exhibited sufficiently high sorption activity and increased stability to the action of oxygen at high temperatures, as compared with that of an analogous material based on individual cellulose, were prepared by the carbonization and the subsequent activation of cellulose compositions with polycarbosilane.     

黏胶纤维用落叶松溶解浆的清洁漂白

引言近年来,随着棉花价格的总体上涨和消费者对纺织材料舒适度的要求,给黏胶纤维带来了需求增长空间。作为黏胶纤维的原材料,国内目前的溶解浆产能难以满足客户需求。据统计,国内溶解浆存     

Modelling oxygen solubility in bleaching solutions

A general thermodynamics‐related model of oxygen solubility, previously developed for water and aqueous inorganic solutions, has been applied to bleaching solutions. The model allows estimations of dissolved oxygen concentrations to be made for different combinations of temperature, oxygen partial pressure and inorganic solute concentrations likely to be encountered during oxygen bleaching of pulp. Combination of the model with oxygen diffusion kinetics allows optimum temperatures for transport‐controlled oxygen delignification rates to be estimated.     

Environmentally friendly coloured materials: cellulose/titanium dioxide/inorganic pigment composite spherical microbeads prepared by viscose phase-separation method

In order to develop environmentally friendly coloured materials, cellulose composite spherical microbeads hybridised with titanium dioxide (TiO₂) particles and inorganic pigment were prepared by a phase-separation method using viscose and an aqueous solution containing sodium polyacrylate. Findings regarding the relationships between cellulose xanthate and the electronic characteristics of TiO₂ particles used in the cellulose/inorganic material composite sphering process are also reported. These findings suggest that the location of TiO₂ particles in cellulose microbeads is related to electrical repulsion between the xanthate (CSS⁻) group and TiO₂. The use of TiO₂ powder as colour pigment is limited, as its colour is white. The cellulose composite spherical microbeads covered with TiO₂ and Fe₂O₃ particles were developed by addition of iron oxide (Fe₂O₃). Their surfaces were viewed by laser microscope and using SEM images. These composite microbeads retained the photocatalytic property of TiO₂. Cellulose/TiO₂/Fe₂O₃ composite spherical microbeads with both colour function and photocatalytic properties were successfully prepared.     

Processing viscose yarn on basic knitting machines

Conclusions The material volume of fabrics from viscose textile yarn of linear density 6.7 tex is considerably less, and the basic qualities are the same as, cloth from serially produced viscose yarn of 8.4 tex linear density.The runnability of an experimental yarn of 6.7 tex linear density on basic knitting machines is considerably better than that of yarn of 8.4 tex linear density, which permits one to increase the productivity of labor and equipment.The use of viscose yarn of 6.7 tex linear density permits one to expand the assortment of tricotage articles with a significant reduction in volume of material and cost of production.This work was performed under the direction of Professor M. P. Nosov.Translated from Khimicheskie Volokna, No. 1, pp. 12–13, January–February, 1985.     

A new electrochemical technique for bleaching cellulose pulp

A study of electrochemical bleaching of cellulose pulp was carried out in an electrolyte cell composed of a horizontal graphite anode and a parallel stainless screen steel cathode, using NaCl as electrolyte. Variables studied were: current density, sodium chloride concentration, pulp concentration, pH and temperature. The rate of bleaching was found to increase with increasing current density, salt concentration and temperature. The rate of bleaching was found to decrease with increasing pH and pulp concentration. Energy consumption ranged from 0.1 kWh kg^?1 (pulp) to 1.75 kWh kg^?1 (pulp), depending on current density and degree of bleaching. The quality of electrochemically bleached pulp was found to compare favourably with that of chemically bleached pulp.     

Photometric determination of aluminum sulfate in a zinc-aluminum-containing bath in viscose manufacturing

Conclusions A procecure has been developed for the photometric determination of the aluminum sulfate content of a mixed zinc-aluminum-containing precipitation bath in viscose manufacturing, using the bifunctional organic reagent chromazo-BRZ.The procedure is highly selective, simple, and rapid. The relative mean-squared deviation (variation coefficient) is 2.4% for an aluminum sulfate concentration of 20–30 g/dm³.The authors express his thanks to N. N. Basargin, doctor of chemical science, and his co-workers in the analytical division of the IGEM, Academy of Sciences of the USSR, for consultation and help in this work.Translated from Khimicheskie Volokna, No. 6, pp. 52–53, November–December, 1989.     

Compensation effect in the activation of fibrous chars prepared from viscose

Viscose chars have been prepared under several different conditions and with four inorganic impregnants. The reaction with CO₂ was studied at several temperatures and the Arrhenius parameters A and E were evaluated. For these related chars A and E were found to conform to the Compensation Effect, In A = β + αE; the isokinetic temperature was 900 K. It is also shown that for such a system of chars the experimentally determined variable In (rate constant) also varies linearly with E for chars activated at the same temperature. Whilst E for a given char is independent of the extent of activation, A is not.