Acrylic acid-sodium acrylate-sulfonic acid inner salt copolymerization cross-linked product and preparation method and application thereof

A sulfonic acid inner salt, copolymerization and cross-linking technology, applied in the field of hydrogel, can solve the problems of low fresh water absorption rate, limited commercial competitiveness, and difficult expansion of the inner salt ring, etc., to achieve low fresh water absorption rate, low cost, Simple operation effect

Pending Publication Date: 2022-01-28
BEIBU GULF UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poly inner salt type hydrogel has good anti-salt sensitivity effect, but there are two defects: first, the inner salt ring is difficult to expand in fresh water, and the fresh water absorption rate of the product is very low; second, the cost of the inner salt monomer is relatively high , which makes the corresponding products expensive and has limited commercial competitiveness

Method used

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  • Acrylic acid-sodium acrylate-sulfonic acid inner salt copolymerization cross-linked product and preparation method and application thereof
  • Acrylic acid-sodium acrylate-sulfonic acid inner salt copolymerization cross-linked product and preparation method and application thereof
  • Acrylic acid-sodium acrylate-sulfonic acid inner salt copolymerization cross-linked product and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0030] This embodiment provides a copolymerized cross-linked product of acrylic acid-sodium acrylate-sulfonic acid inner salt, its structural formula is as follows:

[0031]

[0032] Use the FT-IR / FIR type infrared spectrometer of PerkinElmer company (USA) to carry out FTIR analysis to various functional groups in the product molecule, the result is as follows figure 1 shown;

[0033] For the infrared spectrum ( figure 1 ) analysis, it can be seen that:

[0034] 1720cm -1 Nearby are the C=O vibration peaks of -COOH and -COOR;

[0035] 1550cm -1 Yes - COO - of - O-C=O vibration characteristic peak;

[0036] 1030cm -1 Nearby is the C-N vibration peak;

[0037] 1200cm -1 -SO which is an aliphatic sulfonate 3 - The antisymmetric stretching vibration peak of

[0038] 3300cm -1 is the -OH stretching vibration peak;

[0039] 1450cm -1 is the methyl stretching vibration peak;

[0040] 2900cm -1 Nearby is the methylene stretching vibration peak.

Embodiment 2

[0042] This embodiment provides a method for preparing a copolymerized cross-linked product of acrylic acid-sodium acrylate-sulfonic acid inner salt, the preparation method comprising the following steps:

[0043] (1) Put 10g of acrylic acid, 4g of sodium hydroxide, and 10g of sultone into a dry reactor, dissolve them in 100g of distilled water, stir well, then add 0.005g of cross-linking agent, 0.2g of cerium ammonium nitrate, persulfuric acid Sodium 0.4g, sodium bisulfite 0.2g, sealed with nitrogen gas and evacuated, and reacted at a constant temperature of 40°C for 12 hours to obtain a crude product;

[0044] (2) Soak the obtained crude product in 500 mL of acetone for 24 hours, filter it with suction, dry it at 50°C, and crush it through a 100-mesh sieve to obtain a purified product, namely, the copolymerized cross-linked product of acrylic acid-sodium acrylate-sulfonic acid inner salt, and calculate the yield by weighing The rate is 96.8%.

Embodiment 3

[0046] This embodiment provides a method for preparing a copolymerized cross-linked product of acrylic acid-sodium acrylate-sulfonic acid inner salt, the preparation method comprising the following steps:

[0047](1) Put 10g of acrylic acid, 2g of sodium hydroxide, and 5g of sultone into the reactor, dissolve with 80g of distilled water, stir well, then add 0.1g of crosslinking agent, 0.1g of cerium ammonium nitrate, and 0.3g of sodium persulfate 1. 0.1 g of sodium bisulfite, sealed with nitrogen gas and evacuated, and reacted at a constant temperature of 80 ° C for 3 hours to obtain a crude product;

[0048] (2) Soak the obtained crude product in 500 mL of acetone for 24 hours, filter it with suction, dry it at 50°C, and crush it through a 100-mesh sieve to obtain a purified product, namely, the copolymerized cross-linked product of acrylic acid-sodium acrylate-sulfonic acid inner salt, and calculate the yield by weighing The rate is 98.9%.

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Abstract

The invention relates to the technical field of hydrogel, in particular to an acrylic acid-sodium acrylate-sulfonic acid inner salt copolymerization cross-linked product and a preparation method and application thereof. The preparation method comprises the steps: adding acrylic acid, sodium hydroxide and sulfonic acid inner salt which are accurately weighed into a dry reactor and dissolving with a certain amount of distilled water; uniformly stirring, adding a cross-linking agent and an initiator, carrying out nitrogen sealing and constant-temperature reaction until the system is free of flowability to obtain a crude product, soaking and washing with acetone, carrying out suction filtration, drying, crushing and sieving to obtain a purified product; the product uses cheap and easily available acrylic acid as a main raw material and is supplemented with a proper proportion of salt-sensitive-resistant functional monomer inner sulfonate to generate a synergistic effect, and meanwhile, the product has the advantages of low cost and high salt resistance, can be applied to the field of hydrogel, as a water-absorbent resin, the product can be applied to salt environments such as agriculture and forestry water-retaining agents, drug sustained-release carriers, chemical fertilizer controlled-release, heavy metal ion adsorption in high-salt-content wastewater and the like, and has wide application prospects.

Description

【Technical field】 [0001] The invention belongs to the field of hydrogel technology, and in particular relates to a copolymerized cross-linked product of acrylic acid-sodium acrylate-sulfonic acid inner salt and its preparation method and application. 【Background technique】 [0002] Water-absorbing resin is an important class of functional polymer materials, which can absorb water dozens to thousands of times its own mass and become a hydrogel. It is widely used in pharmaceutical sustained-release carriers, bionic muscle materials, agricultural and forestry water-retaining agents, Controlled-release chemical fertilizers, physiological and hygienic water-absorbing agents, heavy metal ion adsorption and many other fields. Worldwide, among the commercialized hydrogels, acrylic-based hydrogels account for more than 80% of the total products. However, acrylic-based hydrogels have serious salt-sensitivity problems. When there is salt in the environment, the performance of the gel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F228/02C08F222/38C08J3/075C08L33/02A61K47/32C05G3/40C09K17/22B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20C09K101/00C09K107/00
CPCC08F220/06C08J3/075C09K17/22A61K47/32C05G3/40B01J20/261B01J20/28047C02F1/285C08J2333/02C09K2101/00C09K2107/00C02F2101/20C08F228/02C08F222/385
Inventor 王梓民石海信陆来仙王娟虎陈雄
Owner BEIBU GULF UNIV
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