1.Get the purified cotton cellulose disposed in alkaline liquor at 35-40℃ for half an hour, then squeezed and smashed.
2. At the temperature of 35℃, aging treatment is properly carried out in order to make the average degree of polymerization of alkaline fiber obtained within the required range. Put the alkaline fiber into etherification kettle and add propylene epoxide and methyl chloride in turn.
3. Afterwards, get it etherified for 5h at the temperature of 50-80℃and the maximum pressure is about 1.8Mpa.
4. Then, add an appropriate amount of hydrochloric acid and oxalic acid washing materials into the hot water of 90℃ to make the volume expand. It can be dehydrated by centrifuge. When it is washed to neutral and the water content in materials is below 60%, it can be dried as low as 5% in water content by hot air flow of 130℃.
5. Finally, the finished product can be sifted over 20 mesh smashing.
