Method for testing imbibition ability of water-loss reducer

A test method and water-retaining agent technology, applied in the direction of weighing by removing certain components, can solve problems such as large differences, no consideration of particle size gradation, and great differences in particle size gradation combinations of water-retaining agents. To achieve the effect of eliminating the influence of errors

Inactive Publication Date: 2008-08-27
CHINA AGRI UNIV
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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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  • Method for testing imbibition ability of water-loss reducer
  • Method for testing imbibition ability of water-loss reducer
  • Method for testing imbibition ability of water-loss reducer

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Embodiment Construction

[0016] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0017] The bag filter method (including nylon bag, Dacron cloth, gauze, etc.) is relatively poor in data reproducibility and reliability because the part that acts as a filter is easily affected by the operation method and personal habits. The sieve method is more suitable because the shape of the sieve is fixed, and the area of ​​the bottom of the sieve that acts as a filter is fixed, and it is not easily affected by human operation factors. Considering the swelling and dissolution process of the water-retaining agent during water absorption, it is most appropriate to use a 100mesh sieve, and this test also uses the 100mesh sieve filtration method.

[0018] figure 1 It ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
Inventor 李云开林雄财杨培岭许廷武任树梅刘洪禄
Owner CHINA AGRI UNIV
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