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The Transmission Theoretical Model of reactive dyes fluid in wood are systemically reviewed in the paper. It also are summarized the dyeing dynamics and thermodynamics and the reaction mechanism of reactive dye liquor with wood. The existing shortages and development direction of dyeing mechanism of wood with reactive dyes are also presented. Wood is a kind of nature porous material with adsorbability and permeability. When dyeing, reactive dyes solution firstly wet, diffuse, adsorb on the wood surface, next permeate into the wood, then react with the hydroxy and the amino in wood fiber, finally fix in the wood. Dyeing effects are affected by the structure of reactive dyes, the structure of wood and dyeing craft(1). Moreover, the dyeing mechanism can guide and regulate the dyeing craft. This paper summarizes the findings of Transmission Theoretical Model of reactive dyes fluid in wood, the dyeing dynamics and thermodynamics and the reaction mechanism of reactive dye liquor with wood. 1. Transmission Theoretical Model of Reactive Dyes Fluid in Wood The dyeing solution entering into wood interior with diverse anisotropy in alternating direction depends on several transmission modes. There are two major transmission mode: permeation and diffusion(2). The process that fluid flows through correlative holes inside the wood under the impact of static pressure gradient or capillary pressure gradient is called permeation. At present there are many research findings about permeation model, which are mostly based on Darcy law. The main models include Uniform parallel capillary model, Sebatian soft wood model, Bramhall wood longitudinal permeability effective section attenuation model, Petty model, Comstock soft wood model, Soft wood longitudinal gas penetration three-dimensional flow resistance network model(3), etc. The above models are mainly consider soft wood, gas as the main fluid medium, and these models are too complicated or too simplified about wood structure or having not considering reality enough, making the calculation results far from the actual one, so it is difficult to be accepted by engineering application. As to the hardwood with complex cellular structure and Wood liquid penetrant theory, they are not able to establish accurate models from its internal movement mechanism and heat transmission and mass transmission properties. Based on the great influence of wood structure on fluid permeability, wood is generally pretreated and mathematical model of wood extract extraction volume and pretreatment process parameters have been build up, thus not only avoiding the problem of accurately determining permeating law, but also making it easier to control the permeation process. When the moisture content of the wood saturates, dyeing solution diffuses into wood under concentration gradient. The diffusion process complys with Fick diffusion law and the diffusion rate mainly depends on diffusion coefficient. The diffusion models include Diffusion coefficient measurement on carrier drift rate model(4), Alkali impregnating diffusion -reaction model(5), shrinking core model(6), among which Alkali impregnating model(7) can well predicts the concentration of lye of wood internal parts under different impregnating temperature, sequentially predicting the impregnation endpoint when the dyes reach the high adsorption rate.

Development of Dyeing Mechanism of Wood with Reactive Dyes