Method for preparing nano-crystalline cellulose enhanced polyvinyl alcohol foam material with oriented porous structure

Method for preparing nano-crystalline cellulose enhanced polyvinyl alcohol foam material with oriented porous structure

  • CN 104,371,141 A
  • Filed: 11/21/2014
  • Published: 02/25/2015
  • Est. Priority Date: 11/21/2014
  • Status: Active Application
First Claim
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1. possess a preparation method for the nano-cellulose enhanced polyethylene alcohol foam materials of orienting stephanoporate structure, it is characterized in that:

  • comprise the following steps;

    A, suspension mixed solution make;

    a1 paper pulp acid hydrolysis;

    be immersed in by plant paper pulp in the mixing solutions of sulphuric acid soln or sulfuric acid and hydrochloric acid, constant speed is stirred to hydrolysis;

    A2 cleans;

    add water and rush rare stopped reaction, removed by top clear liquid, then it is standing to add water after stratification, repeated multiple times, until be difficult to sedimentation layering occurs, then is transferred in dialysis tubing by suspension, and uses deionized water soaking and washing, until neutral;

    A3 disperses;

    suspension is carried out ultrasonication, then centrifugal, pipette supernatant liquid after centrifugal, supernatant liquid is nano whisker suspension, and continue ultrasonic and centrifugal add deionized water in lower floor'"'"'s suspension after, until suspension all becomes nano whisker suspension;

    A4 configures polyvinyl alcohol solution;

    added by granule of polyvinyl alcohol in 85-95 DEG C of deionized water, does not stop to stir until polyvinyl alcohol melts completely, is configured to the polyvinyl alcohol water solution that mass ratio is 7-10%;

    A5 configures mixing solutions;

    join in polyvinyl alcohol water solution by nano whisker suspension in certain mass ratio, fully mix;

    B, orientation are freezing;

    poured into by mixing solutions in container, container constant speed moves, and immerse in liquid nitrogen with the speed of <

    0.2mm/s;

    C, low-temperature vacuum drying;

    after in solution to be mixed, ice-crystal growth completes, by the container that mixing solutions is housed taken out from liquid nitrogen, put into vacuum freeze drier immediately, takes out after ice crystal distils completely.

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