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The Method of Macromolecular Electrolyte to Improve the Water Absorption of Neutral Hydrogel

A hydrogel and electrolyte technology, which is applied in the field of polymer materials, can solve the problems of fragility, reduced strength of neutral hydrogel, low water absorption and swelling performance of neutral hydrogel, etc., and achieves high water absorption, easy operation, The effect of great application value

Inactive Publication Date: 2017-02-15
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the strength of the neutral hydrogel is closely related to its degree of cross-linking; when the degree of cross-linking decreases, the strength of the neutral hydrogel will be significantly reduced and it will be easily broken
[0007] The water absorption and swelling properties of neutral hydrogels currently used are generally not high. Therefore, it is necessary to develop a method that does not reduce the amount of neutral hydrogel crosslinking agent and does not change its crosslinking degree without reducing the strength of neutral hydrogels. It has become an urgent and important work to improve the water absorption performance of neutral hydrogels at the same time.

Method used

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  • The Method of Macromolecular Electrolyte to Improve the Water Absorption of Neutral Hydrogel
  • The Method of Macromolecular Electrolyte to Improve the Water Absorption of Neutral Hydrogel

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Step 1: Soak the neutral PAAm hydrogel of the sample of Comparative Example 1 in a mixed solution of 0.3mol / L methacrylic acid (MAA) and 0.001mol / L KA, and soak in the dark for 1 day;

[0047] Step 2: Take out the neutral PAAm hydrogel that has absorbed the reactant and seal it in a plastic sample bag. The sample bag is placed under an ultraviolet lamp with a wavelength of 365nm and a power of 300W under 30cm light for 5 hours to obtain the macromolecular electrolyte polymethyl Acrylic acid (PMAA) modified PAAm hydrogel, the hydrogel was soaked in deionized water for 3 days to achieve swelling equilibrium, and the water was changed twice a day to remove impurities such as unreacted monomers and initiators.

[0048] Experimentally measured: the swelling degree is 42.85, and the water absorption rate is 97.71wt%.

Embodiment 2

[0050] Step 1: soak the neutral PAAm hydrogel of the sample of Comparative Example 1 in a mixed solution of 0.5mol / L MAA and 0.002mol / L KA, and soak in the dark for 2 days;

[0051] Step 2: Take out the neutral PAAm hydrogel that has absorbed the reactant and seal it in a plastic sample bag. The sample bag is placed under an ultraviolet lamp with a wavelength of 365nm and a power of 300W and irradiated at 30cm for 5 hours to obtain a macromolecular electrolyte PMAA modification. For PAAm hydrogel, the hydrogel is soaked in deionized water for 3 days to achieve swelling equilibrium, and the water is changed twice a day to remove impurities such as unreacted monomers and initiators.

[0052] Experimentally measured: the degree of swelling is 54.29, and the water absorption rate is 98.19wt%.

Embodiment 3

[0054] Step 1: soak the neutral PAAm hydrogel of the sample of Comparative Example 1 in a mixed solution of 0.7mol / L MAA and 0.003mol / L KA, and soak in the dark for 3 days;

[0055] Step 2: Take out the neutral PAAm hydrogel that has absorbed the reactant and seal it in a plastic sample bag. The sample bag is placed under a UV lamp with a wavelength of 365nm and a power of 300W under 10cm light for 3 hours to obtain a macromolecular electrolyte PMAA modification For PAAm hydrogel, the hydrogel is soaked in deionized water for 3 days to achieve swelling equilibrium, and the water is changed twice a day to remove impurities such as unreacted monomers and initiators.

[0056] Experimentally measured: the swelling degree is 55.15, and the water absorption rate is 98.22wt%.

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Abstract

The invention relates to a method for increasing a neutral hydrogel water absorption ratio by adopting macromolecule electrolyte. The method is characterized by comprising the following steps: step 1: completely soaking neutral hydrogel into a mixed solution consisting of electrolyte monomer and initiator, soaking the neutral hydrogel water absorption ratio under the room temperature for 1 to 3 days to reach swelling equilibrium, and the initiator is a photo initiator or a thermal initiator; step 2: taking out the soaked neutral hydrogel in the step 1, initiating the polymerization reaction of the electrolyte monomer sucked by the neutral hydrogel by applying ultraviolet or heating, soaking the reacted neutral hydrogel in the deionized water for 3 days to reach swelling equilibrium, changing the water twice a day, removing the electrolyte monomer and initiator which are not completely reacted to obtain the high-water-absorption-ratio neutral hydrogel. By adopting the method, the consumption of a crosslinking agent of the hydrogel is not changed, the mechanical performance is not reduced, simplicity in operation can be realized, and the water absorption ratio of the neutral hydrogel can be increased. The application value of the method in the fields such as medical sanitation, industry, agriculture and the like is high.

Description

technical field [0001] The invention relates to a method for improving the water absorption rate of a neutral hydrogel by using a macromolecular electrolyte, and belongs to the technical field of macromolecular materials. Background technique [0002] Neutral hydrogel is a network structure formed by the cross-linking of neutral hydrophilic polymers, which can swell in water and retain a large amount of water without dissolving. Different from absorbent materials such as paper fiber, sponge, cotton cloth, etc., neutral hydrogel can absorb water up to hundreds of times its original mass, and can be firmly combined with water while expanding, and the water is not easy to lose under a certain pressure. At present, water-absorbing hydrogels with high water retention have broad application prospects in many fields. For example, it can be used as a wound dressing in medical and sanitary products to absorb wound exudate; it can be used as a water-retaining material in agriculture ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F291/00C08F220/06C08F2/50C08K5/092C08J3/075C08J3/24C08L33/26C08L29/04
Inventor 李学锋陈倩文闫晗龙世军
Owner HUBEI UNIV OF TECH
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