Method for testing imbibition ability of water-loss reducer

Abstract

The present invention discloses a test method for the liquid absorbing capability of water retaining agent, comprising the following steps that: water retaining agent to be tested is weighed; the water retaining agent is soaked in solution; after the liquid absorption of different time intervals t, the soaked water retaining agent gel is poured on the whole floor screen; liquid is controlled till no liquid drops from the water retaining agent gel; the weight of the water retaining agent gel is measured with a drying utensil and recorded as Wt; when the relative water absorbing rate is lower than 0.0005 (g.g<-1>) / (g.g<-1>.min<-1>), an experiment stops; fitting is carried out according to a formula t / Wt=A+Bt, obtaining the numerical values of A and B, and the reciprocal value of B is just the maximum water absorbing rate of the water absorbing capability of the water retaining agent. The present invention puts forward a test method for the liquid absorbing capability of water retaining agent, which is based on the combined application of water retaining agent 100 mesh screen method and water retaining agent swelling kinetics model calculation, determines reasonable test control time, corresponding water absorbing capability calculation method and other key contents, and eliminates the influence error of particle size to the water absorbing capability of water retaining agent.

Description

technical field [0001] The invention relates to the field of agricultural water saving, in particular to a method for testing the liquid absorption capacity of a water retaining agent. Background technique [0002] Water-retaining agent, also known as soil water-retaining agent, superabsorbent, humectant, superabsorbent resin, polymer water-absorbing agent, is a high-molecular polymer with super high water-absorbing and water-retaining capacity, which can quickly absorb and maintain hundreds of times its own weight Even thousands of times more water, and has the function of repeatedly absorbing water. After absorbing water, it swells into a hydrogel, which can slowly release water for plant absorption and utilization. Due to the cross-linking of the molecular structure, all the absorbed water can be gelled, and the water absorbed by the molecular network Particles cannot be extruded by general physical methods, so they have strong water retention. [0003] The water-retaini...

AI Technical Summary

Problems solved by technology

However, due to the different measurement methods used, and the particle size gradation combination of water-retaining agents is very different (the water-absorbing characteristics of water-retaining agents with different particle sizes are significantly different), resulting in no comparison of the water absorption capacity measurement results. At the same time, in order to promote their products, water-retaining agent manufacturers However, its product performance is often exaggerated, so the measurement and calculation method of unified water absorption performance is undoubtedly important for both scientific research and production applications.

At present, the measurement methods and calculation methods are quite different in the performance testing process of water-retaining agents, and the particle size distribution with large differences in water absorption characteristics has never been considered.

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