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Method for measuring influence of pH values on volume phase transitions of composite water absorbent resin

A technology of water-absorbent resin and testing method, which is applied in the field of testing the effect of pH value on the volume phase transition of composite water-absorbent resin, can solve the problems of polymer brittleness and reduced tensile strength, and achieve reduced measurement costs, simple measurement steps, and easy measurement. high precision effect

Inactive Publication Date: 2012-05-23
袁俊海
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

If the water absorption of the resin is controlled by increasing the crosslinking density, the polymer will become brittle and the tensile strength will decrease

Method used

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  • Method for measuring influence of pH values on volume phase transitions of composite water absorbent resin
  • Method for measuring influence of pH values on volume phase transitions of composite water absorbent resin
  • Method for measuring influence of pH values on volume phase transitions of composite water absorbent resin

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Embodiment

[0033] The test method for the influence of the pH value on the volume phase transition of the composite water-absorbing resin involved in the present invention comprises the following steps:

[0034] (a) preparing composite water-absorbing resin powder for subsequent use;

[0035] (b) placing the composite water-absorbing resin powder in multiple beakers respectively, and adding absorbed liquids with different pH values ​​into the beakers;

[0036] (c) After the resin fully swells and absorbs water, use a mesh screen to filter out the free water;

[0037] (d) Then place the water-absorbing gel in the same liquid to be tested, and calculate the volume V of the water-absorbing gel under different pH values ​​from the rising height of the liquid level.

[0038](e) Calculating the expansion rate from the volume V of the water-absorbing gel, and comparing the expansion rates under different pH values, to obtain the effect of the solution concentration on the volume phase transiti...

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Abstract

The invention discloses a method for measuring the influence of pH values on volume phase transitions of a composite water absorbent resin, comprising the following steps: preparing composite water absorbent resin powder for subsequent use; putting the composite water absorbent resin powder in a plurality of beakers, and adding absorbed solutions having different pH values; after the resin fully swells and absorbs water, filtering free water out; respectively calculating the volume phase transitions under different pH values by liquid level rising heights; carrying out comparison to obtain the influence of the pH values on the composite water absorbent resin volume phase transitions. According to the invention, the influence of the pH values on the volume phase transitions of the composite water absorbent resin can be measured, the measurement accuracy is high, the measurement steps are simple, the measurement cost is reduced, and a good theoretical basis to the usage of the hydrophobic high strength resin is provided.

Description

technical field [0001] The invention relates to a test method for the effect of pH value on volume phase transition of composite water-absorbing resin. Background technique [0002] High water absorption is a functional polymer material with strong water absorption and water retention properties. It can absorb hundreds of times or even thousands of times its own weight of water, and can maintain water for a long time under a certain temperature and pressure of the external environment, which is unmatched by traditional liquid-absorbing materials such as sponges. [0003] In the 1960s, the earliest water-absorbent resin was produced by hydrolysis of starch-acrylonitrile graft copolymer by the US Department of Agriculture, which opened the prelude to extensive research on water-absorbent polymers around the world. Shortly thereafter, research reported that "the starch-derived water-absorbing resin has excellent water-absorbing capacity, and the gel has strong water retention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/44
Inventor 袁俊海
Owner 袁俊海
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