3 results about "Cellulose xanthate" patented technology

The invention discloses a method for preparing viscose fiber from alkali-soaked hemicellulose, and relates to the technical field of viscose fiber production and preparation, and the method comprises the following steps: sequentially carrying out multi-stage filtration and twice nanofiltration membrane filtration on alkali liquor squeezed from slurry porridge, and separating out high-concentration hemicellulose alkali liquor; after cellulose xanthate is generated through a xanthating machine reaction, high-concentration hemicellulose alkali liquor is added into the xanthating machine to be subjected to a xanthating reaction, and hemicellulose xanthate is generated; and adding dilute alkali liquor into the xanthating machine for dissolving, and sequentially filtering, defoaming and spinning to prepare the viscose fiber. After alkali cellulose and carbon disulfide are subjected to a yellowing reaction, high-concentration hemicellulose alkali liquor is added into a yellowing machine for secondary yellowing, then two xanthate esters are dissolved with dilute alkali liquor, and subsequent filtering, defoaming and spinning procedures are performed, so that full utilization of hemicellulose is realized, and the quality and spinnability of viscose fibers are guaranteed; meanwhile, pulp unit consumption and new alkali consumption are reduced, and the production cost is saved.

The invention relates to the technical field of concrete curing agents, in particular to a composite concrete anti-permeability internal curing agent and preparation and application thereof. The curing agent is prepared from the following raw materials in parts by weight: 10 to 30 parts of paraffin emulsion, 10 to 40 parts of cellulose xanthated grafted acrylate, 10 to 40 parts of polyvinyl alcohol, 1 to 5 parts of polyacrylamide and 15 to 30 parts of water. Through the emulsification and dispersion effects of the paraffin emulsion, uniform coating of polyvinyl alcohol and polyacrylamide on the surface of concrete is realized, and a unique'isolation-water retention 'composite functional layer is formed: on one hand, the paraffin emulsion can effectively block invasion of external water; on the other hand, polyvinyl alcohol and polyacrylamide synergistically exert an excellent water retention effect, so that water in the concrete is kept, and the overall anti-permeability performance of the concrete is remarkably improved through the synergistic mechanism.

This invention discloses a self-healing concrete crack-resistant agent and its preparation method, belonging to the field of concrete repair agents. The raw material components of the self-healing concrete crack-resistant agent include silane-treated mixed cement, cellulose xanthate-treated quartz sand, nano-silica, and anhydrous citric acid. The self-healing concrete crack-resistant agent of this invention not only improves the strength of concrete after coating but also increases the strength recovery rate of concrete after repair. The compressive strength recovery rate of the repaired concrete is 112.8-113.2%, and the flexural strength recovery rate is 114.6-115.3%.