| 摘要 |
<p>The invention relates to cellulose nano fibres and to a process for making the same. According to the invention, the nano fibres are made in a powder form, having a diameter of 10...60 nm and a shape factor of 10...50, and a crystallinity degree of at least 80%. The process, as claimed by the invention, consists in treating a cellulose source aqueous dispersion in a concentration of 20...50% with sulphuric acid in a concentration of 95...98%, firstly at the ambient temperature and then at a temperature of up to 70°C, while stirring continuously at a rate of 300...1500 rpm, after which the resulting nano fibres suspension is washed until a pH of at least 4 is reached and is dried by lyophilization, resulting into dry nano fibres.</p> |
