A kind of preparation method of waterproof cellulose film

Abstract

The invention relates to a preparation method of a waterproof cellulose film. Firstly, the regenerated cellulose film is prepared by using the cellulose dissolving pulp recovered from waste polyester-cotton blended fabrics, and then the regenerated cellulose film is soaked in a silane coupling agent-ethanol solution for a certain period of time. After a period of time, take it out and air-dry to obtain the waterproof cellulose membrane; the water contact angle of the waterproof cellulose membrane is 56.31° to 93.85°; the recovery of cellulose dissolving pulp from waste polyester-cotton blended fabrics includes pretreatment—enzyme treatment— - pre-soaking and cooking - beating and dehydration - removing metal ions - bleaching process; pre-soaking and cooking process: mix the waste polyester-cotton blended fabric with a solid-to-liquid ratio of 1:5 to 35 and the cooking liquid Dip in a cooking pot before cooking; the cooking liquid is NaOH and anthraquinone or NaOH, Na 2 S and anthraquinone are dissolved in deionized water, and the amount of alkali used is less than 100%. The method of the invention is simple and easy, and the cost is low, and the prepared waterproof cellulose membrane has excellent waterproof performance.

Description

technical field [0001] The invention belongs to the technical field of recycling waste fabrics, and relates to a preparation method of a waterproof cellulose membrane. Background technique [0002] Regenerated cellulose film has the advantages of degradability, high temperature resistance, non-toxic and tasteless, strong gloss, high transparency, no static electricity, dustproof, green and environmental protection, etc. It has a very wide range of applications in food packaging, fireworks packaging, pharmaceutical packaging and other fields. application. At present, most of the regenerated cellulose membranes on the market are regenerated cellulose membranes produced by imported wood pulp and cotton pulp, but at the same time, with the improvement of people's living standards and changes in consumption concepts, a large number of waste textiles are produced every year in my country, and the output exceeds 26 million tons. At present, the recycling of waste polyester-cotton ...

AI Technical Summary

Problems solved by technology

[0003] However, the regenerated cellulose membrane currently on the market has the problem of poor waterproof performance.

[0004] In order to solve this problem, Chinese patent CN107365423A discloses a method for hydrophobic modification of cellulose, which includes hydrophobic modification of cellulose film. This method makes full use of the chemical vapor deposition method to directly prepare hydrophobic For the modified cellulose film, place the cellulose material in a desiccator, place a small open container at the bottom of the desiccator, add 5-10mL of organosilylating reagent, vacuumize the desiccator to a vacuum state, and put it in an oven Heating, the heating temperature is 40-120°C, and the heating time is 10min-24h. Compared with impregnation, vacuuming, heating temperature and heating time are much more complicated, and the modification process is more complicated; Chinese patent CN107746584B discloses a waterproof cellophane The preparation method is to obtain modified emulsified liquid paraffin by using emulsified paraffin and acrylic acid monomer to emulsify under the trigger of potassium thiosulfate, alkalinize and yellow the bagasse to obtain cellulose viscose, cellulose viscose and modified emulsified The liquid paraffin mixed with the film is placed in the coagulation bath and then taken out, washed with water, washed with alcohol and dried to obtain waterproof cellophane. The process of this method is complicated, and the finished cellulose film cannot be directly modified.

None of the above methods has achieved the purpose of directly waterproofing the cellulose membrane with a simple and economical method. Therefore, it is necessary to study a simple and economical method to achieve the purpose of waterproofing the finished cellulose membrane.