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A kind of super absorbent resin and its preparation method and application

A super absorbent resin, super absorbent technology, used in absorbent pads, sanitary napkins, bandages, etc., can solve the problems of high reactivity, reduced yield, structural damage, etc., to increase specific surface area, improve gel strength. , Improve the effect of water absorption speed

Active Publication Date: 2019-01-25
ZHONGSHAN HENGGUANGYUAN ABSORBENT MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there are mainly two technologies for the production of superabsorbent resins: reverse-phase suspension polymerization and aqueous solution polymerization. Among them, the aqueous solution polymerization technology occupies more than 95% of the superabsorbent resin market due to its relatively simple process, environmental protection and pollution-free production process, etc., but the aqueous solution The general disadvantage of polymerization technology is that the water absorption rate is relatively slow, resulting in poor comfort due to body fluids (urine or menstrual blood) not being absorbed in time in the initial stage of use of the finished product
In order to increase the absorption rate, some grind the particles finer and increase the specific surface area to increase the speed. However, in this way, it is easy to cause dust to fly during the processing and molding of the finished product. First, it causes material loss. The second is that the amount of raw materials is insufficient, and the third is that it has a great impact on the working environment and operators; there are still some solutions that make the water-absorbent resin into particles with porous diameters, but in practical applications, because the product particles themselves are relatively small Small (mainly 40-80 mesh), the pore size formed in the early stage is basically destroyed during the grinding process, so it is not only difficult to improve the water absorption speed, but also increases the fine powder rate, reduces the yield, and by-products increase, which indirectly leads to higher costs
In addition, in free radical polymerization, N, N'-methylenebisacrylamide (MBA) is mostly used as a crosslinking agent. MBA has a short molecular chain and high reactivity, and is mostly consumed in the initial stage of the reaction, but difficult to obtain in the later stage of the reaction. Form a cross-linked structure, therefore, the product structure is not uniform and contains a large amount of linear soluble polymers, which affects the performance of the product

Method used

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  • A kind of super absorbent resin and its preparation method and application
  • A kind of super absorbent resin and its preparation method and application
  • A kind of super absorbent resin and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A superabsorbent resin, which is made of acrylic acid, acrylate or acrylic acid derivatives as polymerized monomers, neutralized with sodium hydroxide alkaline substance and deionized water, and then polymerized under the action of a composite crosslinking agent and an initiator A water-absorbent resin with a dense pore structure, the average pore diameter of the water-absorbent resin is 11.7 μm; wherein, the polymerized monomer is acrylic acid, and the composite crosslinking agent is glycerin and N, N'-methylenebisacrylamide Add according to the molar ratio of 1:2, the alkaline substance is sodium hydroxide; the dosage of each component is respectively:

[0045] Acrylic acid 25% (wt%),

[0046] Sodium hydroxide 25% (wt%),

[0047] Deionized water 48.845% (wt%),

[0048] Composite crosslinking agent 0.005% (wt%),

[0049] Ammonium persulfate 0.15% (wt%);

[0050] Concrete preparation method comprises the following steps:

[0051] 1) Neutralization: disperse acrylic...

Embodiment 2

[0060] A superabsorbent resin, which uses acrylic acid, acrylate or acrylic acid derivatives as polymerized monomers, neutralizes with alkaline substances and deionized water, and then polymerizes under the action of a composite crosslinking agent and an initiator to form dense pores. structure of water-absorbent resin, the average pore size of the water-absorbent resin is 10.9 μm; wherein, the polymerized monomer is acrylic acid, and the composite cross-linking agent is glycerin and N,N'-methylenebisacrylamide according to the molar ratio For adding in a ratio of 1:3, the alkaline substance is sodium hydroxide; the consumption of each component is respectively the consumption of the polymerized monomer, sodium hydroxide and deionized water in mass percent:

[0061] Acrylic acid 50% (wt%),

[0062] Sodium hydroxide 8% (wt%),

[0063] Deionized water 41.8% (wt%),

[0064] Composite crosslinking agent 0.05% (wt%),

[0065] Ammonium persulfate 0.15% (wt%);

[0066] Concrete p...

Embodiment 3

[0076] A superabsorbent resin, which uses acrylic acid, acrylate or acrylic acid derivatives as polymerized monomers, neutralizes with alkaline substances and deionized water, and then polymerizes under the action of a composite crosslinking agent and an initiator to form dense pores. Structured water-absorbent resin, the average pore size of the water-absorbent resin is 14.1 μm; wherein, the polymerized monomer is acrylic acid, and the composite cross-linking agent is glycerin and N,N'-methylenebisacrylamide according to the molar ratio For adding in a ratio of 1:2.5, the alkaline substance is potassium hydroxide; the consumption of each component is respectively the consumption of the polymerized monomer, sodium hydroxide and deionized water in mass percent:

[0077] Acrylic acid 50% (wt%),

[0078] Sodium hydroxide 20% (wt%),

[0079] Deionized water 34.94% (wt%),

[0080] Composite crosslinking agent 0.05% (wt%),

[0081] Ammonium persulfate 0.01% (wt%);

[0082] Concr...

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Abstract

The invention discloses high water absorption resin and a preparation method and application thereof. The high water absorption resin is water absorption resin with a dense hole structure and the absorption resin is prepared in the mode that acrylic acid, acrylate or acrylic acid derivatives which serve as monomers are neutralized with alkaline substances and deionized water and then polymerized under the action of a crosslinking agent and an initiator; the average pore size of the water absorption resin is 10 to 15 micrometers. The high water absorption resin can be applied in a water absorption or blood absorption product and is lightly-crosslinked polyacrylic acid (polyacrylate) type high water absorption resin. Since the dense hole physical structure is formed, the specific surface area of the product is improved so as to improve the speed of absorption.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a superabsorbent resin and its preparation method and application. Background technique [0002] Super Absorbent Resin (SAR) is a typical functional polymer material, which has many hydrophilic functional groups and is slightly cross-linked, insoluble in water and highly absorbent. Molecular compounds, which can absorb and retain hundreds or even thousands of times their own weight in water or tens of times in salt water, are usually called "Super Absorbent Polymer (SAP)", "water-absorbent Polymer material", "water-absorbing polymer resin" or "super absorbent" and so on. [0003] Super absorbent resin (SAP) has a unique body-shaped network structure, which also endows it with super water absorption capacity, fast water absorption speed, good water retention performance, etc., even if it is subjected to external pressure, it is difficult to separate the absorbed water, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/06C08F2/44C08K5/053C08K5/20C08J3/24A61F13/47A61F13/496
Inventor 柴松锋张鲁桂郑雅达
Owner ZHONGSHAN HENGGUANGYUAN ABSORBENT MATERIAL CO LTD
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