High-molecular water-absorbent resin, composite absorbent core and preparation method of water-absorbent resin

A technology for absorbent cores and water-based resins, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc. Leakage or flooding and other problems, to avoid insufficient improvement, obvious capillary effect, and promote the effect of later absorption rate

Inactive Publication Date: 2019-06-28
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the composite absorbent cores in the prior art have various problems: the liquid absorption and storage capacity of the middle absorbent layer is insufficient, resulting in the longitudinal penetration of liquid from the surface layer to the bottom layer and the lateral diffusion along the surface of the composite absorbent core, which easily leads to liquid leakage. Excessive local accumulation leads to side leakage or flooding; poor surface dryness and poor comfort
However, adding hydrophobic substances such as reinforcing agent powder, due to the water-repelling effect of the hydrophobic substance itself, will lead to insufficient improvement in the late absorption rate of the superabsorbent resin; in addition, hydrophobic substances usually have low affinity with the absorbent resin, so in Problems with even addition

Method used

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  • High-molecular water-absorbent resin, composite absorbent core and preparation method of water-absorbent resin

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preparation example Construction

[0029] In a first aspect, the present invention provides a method for preparing a polymer water-absorbent resin, the method comprising the following steps:

[0030] (1) Mix acrylic acid (water-soluble polymerizable monomer), crosslinking agent and hydrophobic polymerizable monomer composed of halogenated styrene and cycloisoprene with water to obtain a mixture;

[0031] (2) Add water-based resin dispersion and antibacterial and deodorizing additives to the mixture obtained in step (1) and pass nitrogen gas to remove oxygen (for example, pass nitrogen gas to remove oxygen for 8 to 20 minutes) to obtain a mixed solution, and then add The initiator initiates the polymerization reaction to obtain a resin gel;

[0032] (3) The resin gel obtained in step (2) is successively granulated, neutralized, dried (for example, the drying temperature can be 140° C.), ground and sieved to obtain a polymer water-absorbent resin; in the present invention In , the polymeric water-absorbent resin...

Embodiment 1

[0060] ① 100 parts by weight of acrylic acid, 0.1 part by weight of polyethylene glycol diallyl ether (crosslinking agent); hydrophobic polymerization monomer m-chlorostyrene and cycloisoprene, the molar ratio is 1:1, a total of 30 parts by weight and 300 parts by weight of deionized water were stirred and mixed, and after uniform mixing, a mixture was obtained.

[0061] 2. add 10 parts by weight of water-based ethylene / vinyl acetate resin dispersion (water-based ethylene-vinyl acetate resin dispersion) to the mixture obtained, the average particle diameter of the resin polymer in the water-based resin dispersion is less than 400nm, and the mixed particles A diameter of 0.5 parts by weight of inorganic particle montmorillonite and 1:1 honeysuckle extract and peppermint extract in a mass ratio of 220nm add up to 0.5 parts by weight, nitrogen deoxygenation for 15min, to obtain a mixed solution; then in the mixed solution 0.04 parts by weight of ammonium bisulfite was added to in...

Embodiment 2

[0064] ① 100 parts by weight of acrylic acid, 0.1 part by weight of polyethylene glycol diallyl ether (crosslinking agent); hydrophobic polymerization monomer m-chlorostyrene and cycloisoprene, the molar ratio is 1:1, a total of 15 parts by weight and 250 parts by weight of deionized water were stirred and mixed, and after uniform mixing, a mixture was obtained.

[0065] 2. Add 8 parts by weight of water-based polyvinyl chloride resin and polyurethane resin mixed resin dispersion in the obtained mixture, the average particle diameter of the resin polymer in the water-based resin dispersion is less than 400nm, and the mixed particle diameter is 220nm inorganic particle montmorillonite Soil 0.5 parts by weight and a mass ratio of 1:1 honeysuckle extract, peppermint extract, a total of 0.5 parts by weight, nitrogen deoxygenation 18min, to obtain a mixed solution; then add 0.06 parts by weight of hydrogen sulfite to the mixed solution Ammonium initiates the polymerization reaction...

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Abstract

The invention relates to a high-molecular water-absorbent resin, a composite absorbent core and a preparation method of the water-absorbent resin. The preparation method of the water-absorbent resin comprises the steps that acrylic acid, a crosslinking agent and a hydrophobic polymerization monomer are mixed with water, a water-absorbent resin dispersion liquid and an antibacterial deodorizing additive are added, nitrogen is introduced to remove oxygen, and a mixed solution is obtained; an initiator is added into the mixed solution to initiate a reaction to obtain resin gel; the resin gel is subjected to granulation, neutralization, drying, grinding and sieving in sequence to obtain the water-absorbent resin. The composite absorbent core comprises an upper water permeable dry layer, an intermediate water absorbing layer and a lower water permeable dry layer in sequence from top to bottom; the intermediate water absorbing layer comprises at least one layer of a network structure, each network structure is formed by interweaving the upper water permeable dry layer and the lower water permeable dry layer through a cross contact point bonding method, and the water-absorbent resin is distributed in the network structures. The composite absorbent core has a sufficiently fast water absorption rate and a sufficient absorption amount; the surface layer has good dryness, high comfort andexcellent antibacterial deodorizing performance.

Description

technical field [0001] The invention relates to the technical field of composite absorbent cores, in particular to a polymer water-absorbent resin, a composite absorbent core and a preparation method thereof. Background technique [0002] At present, composite absorbent cores are widely used in sanitary materials such as disposable diapers, sanitary napkins, incontinence pads, and disposable tablecloths. 90% of the composite core structures on the market include a surface layer, a bottom layer and an intermediate layer arranged between the surface layer and the bottom layer, and the absorbent material is fixed on the surface of the intermediate layer by bonding or other means, and the superabsorbent resin ( SuperAbsorbent Polymer (SAP for short) is a functional polymer material with polar groups and a certain degree of crosslinking. It has the characteristics of water absorption but insoluble in water or conventional organic solvents, and can absorb tens of times or even th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F220/06C08F212/14C08F2/44C08K3/34C08K5/00B32B27/32B32B27/02B32B9/00B32B9/04B32B9/02B32B27/06B32B37/00B32B37/12B32B38/08
Inventor 荣敏杰于庆华荣帅帅刘萌琦
Owner SHANDONG NUOER BIOLOGICAL TECH
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