Preparation method of aminated thiolignin-based strong oil absorption material

Abstract

The invention discloses a preparation method of an aminated thiolignin-based strong oil absorption material. The preparation method is simple, is low in energy consumption, and is wide in application range. The obtained aminated thiolignin-based strong oil absorption material is high in oil absorption rate. The preparation method comprises following steps: lignin is dissolved in a NaOH aqueous solution, an amination agent is added after full stirring, a formaldehyde solution is added slowly, thermal insulation reaction is carried out for 15min to 2h, an obtained reaction solution is added into heat distilled water, hydrochloric acid is added dropwise with stirring so as to realize full precipitation of aminated lignin, the aminated lignin is washed until pH value of a washing solution is increased to be 7, is dried, is grinded into fine powder, and then is subjected to vacuum drying so as to obtain aminated lignin; at 25 to 45 DEG C, a vulcanizing agent is added into an aminated lignin suspension obtained via dissolving of aminated lignin in a solvent, stirring reaction is carried out for 24 to 72h at 25 to 45 DEG C, and an obtained product is cooled to room temperature, is filtered, is washed with distilled water, and is dried so as to obtain a solid product which is the aminated thiolignin-based strong oil absorption material.

Description

technical field [0001] The invention relates to a preparation method of an oil-absorbing material, in particular to a preparation method of a thioaminated lignin-based strong oil-absorbing material. Background technique [0002] Lignin is a complex multi-ring structure and three-dimensional network polymer organic matter (see the following formula). There are functional groups such as alcoholic hydroxyl group (a), phenolic hydroxyl group (b), carboxyl group, and methoxyl group on the molecule, which are beneficial to the macromolecular structure. grooming. In nature, the reserve of lignin is second only to cellulose, and it is regenerated at a rate of tens of billions of tons every year. The pulp and paper industry separates about 140 million tons of cellulose from plants every year, and at the same time obtains about 50 million tons of lignin by-products, but so far, more than 95% of lignin has been directly discharged into rivers as "black liquor". It causes serious seco...

AI Technical Summary

Problems solved by technology

Conventional resin oil-absorbing materials are acrylic resins and olefin resin materials, and their structures are characterized by low three-dimensional network chemical cross-linking structures. There is a problem of competitive adsorption between water and oil in the treatment of oil pollution on the sea surface caused by oil spills from tankers. , resulting in mutual interference of water absorption and oil absorption

In the prior art, Chinese Journal of Papermaking. 2005, 20 (2): 75-78 discloses that a conventional heating reaction has been used to synthesize diethylenetriamine / formaldehyde modified lignin amine, and it is found that it is used as a co-emulsifier, which is effective on asphalt. Emulsification has an auxiliary effect, but due to the poor surface activity of modified lignin amine, it cannot be directly used in oil-absorbing materials

The Chinese patent with the publication number CN 104448340A discloses a lignin-based microporous molecular sieve composite oil-absorbing material, which can be used to solve the problem of low primary oil absorption by virtue of the advantages of regular molecular sieve channels and controllable pore size distribution. Synthesis, silylation, and copolymerization are prepared in three steps. The synthetic route is long and the product yield is not high, resulting in complicated process and high cost.

Images