Cross-linked shperical macroporous cellulose bead and clean preparing process by jetting method

Abstract

The invention discloses a macroporous cross-linked spherical cellulose bead and its cleaning spray method preparation process. The steps are as follows: dissolving pulp or cotton at a suitable temperature to form a cellulose-NMMO-water solution with a suitable mass fraction, and adding Stabilizer and porogen; at a suitable temperature, it is directly sprayed into the coagulation bath composed of NMMO aqueous solution and surfactant through an adjustable spray gun, cross-linked and solidified under stirring, and the specific surface area of ​​different particle sizes is 120-760m 2 / g, moisture content 50%-80%, skeleton density 0.86-1.28g / ml, apparent density 0.47-0.72g / ml, pore volume 0.23-1.06ml / g, pore size 80%-97% Linked spherical cellulose beads. The manufacturing process of the invention is simple and non-toxic. The product has good swelling resistance, oxidation resistance, biodegradation resistance and acid and alkali degradation resistance.

Description

Technical field: [0001] The invention belongs to the field of functional macromolecular materials, and in particular relates to the preparation of macroporous crosslinked spherical cellulose beads by spraying method, its cleaning process and the recovery method of solvent. Background technique: [0002] In today's world, the reserves of oil and natural gas resources are limited, and their research, development and utilization have an increasingly serious impact on the earth's ecological environment, which has prompted the vigorous development of polymer materials that use natural resources as raw materials. Cellulose is the most abundant and recoverable natural resource on the earth. It is cheap, degradable and does not pollute the environment. Therefore, all countries in the world attach great importance to the research and development of cellulose. Cellulose adsorbent is one of the important development directions of cellulose functional polymer materials. This kind of ad...

AI Technical Summary

Problems solved by technology

The solvents currently used to dissolve cellulose are mainly copper ammonia complex solvents, cadmium ethylenediamine complex solvents and PF / DMSO, N 2 o 4 / DMSO, L NH 3 / NH 4 Solvents such as SCN and LiCl / DMAc, because some solvents are still in the experimental stage, and some have the possibility of realizing production, but they cannot be used as raw material solutions for the preparation of cellulose beads, so many domestic and foreign researchers choose Inexpensive and convenient source of viscose to prepare cellulose beads [1-8]

However, a large amount of waste liquid (such as waste lye, etc.), waste gas (such as CS 2 、H 2 S, SO 2 and other harmful gases) and waste (such as solid waste, etc.), causing serious pollution to the environment, and to a certain extent restricting the development of spherical cellulose adsorbents

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