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Super absorbent resin/kaolin composite sphere moisture absorption material with shell-core structure and preparation method thereof

A technology of super absorbent resin and hygroscopic material, applied in the field of composite hygroscopic materials, can solve the problems of small capacity, low efficiency, slow moisture absorption rate, etc., and achieve the effects of large water storage capacity, increased specific surface area, and low cost

Active Publication Date: 2020-07-03
WENZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution solves the problems of slow moisture absorption rate, low efficiency and small capacity of existing superabsorbent resins by constructing a composite porous transmission layer on the surface of superabsorbent resins.

Method used

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  • Super absorbent resin/kaolin composite sphere moisture absorption material with shell-core structure and preparation method thereof
  • Super absorbent resin/kaolin composite sphere moisture absorption material with shell-core structure and preparation method thereof
  • Super absorbent resin/kaolin composite sphere moisture absorption material with shell-core structure and preparation method thereof

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preparation example Construction

[0037] Such as Figure 7 Shown is the preparation process flow chart of the present invention. It includes the following steps

[0038] S1 activation: kaolin is suspended in saline solution for activation, then dried and ground to obtain activated kaolin;

[0039] S2 swelling: the spherical superabsorbent resin is immersed in deionized water to absorb water and swell;

[0040] S3 coating: the swollen superabsorbent resin is taken out by water filtration, and then mixed with activated kaolin, so that the activated kaolin is evenly coated to obtain coated particles;

[0041] S4 drying and sieving: drying the coated particles until the surface hardens, and at the same time, a small amount of activated kaolin powder will fall off from the surface of the dry particles, and sieving is performed to remove the excess kaolin that falls off, and obtain a shell-core structure superabsorbent resin / kaolin Composite ball hygroscopic material.

[0042] The details of the present inventio...

Embodiment 1

[0044] Take kaolin with a particle size of 80um and suspend it in saturated sodium chloride salt solution for 2.5 hours, then dry and grind to obtain activated kaolin. Take the superabsorbent resin ball and immerse it in deionized water to swell for 1 hour, then take out the swollen ball by filtering and drying it, and blend it with activated kaolin at a mass ratio of 1:30, so that the activated kaolin is evenly coated on the surface of the ball. Coating time was controlled within 10 minutes; then dried at 110°C for 4 hours, and the dried product was sieved to remove excess kaolin powder to obtain shell-core structure PAAS / kaolin composite spherical hygroscopic material PK8-25-1. The average particle diameter of the composite balls is 0.657 cm, and the content of kaolin in the composite particle balls of this embodiment is 26.08%.

[0045] figure 2 It is the moisture absorption curve measured by PK8-25-1 and pure resin balls under the conditions of constant temperature 30°C, h...

Embodiment 2

[0047] Take kaolin with a particle size of 50um and suspend it in a saturated salt solution for 2.5 hours, then dry and grind to obtain activated kaolin. Take the superabsorbent resin ball and swell it in deionized water for 2 hours, then take out the swollen ball by filtering and drying it, and blend it with activated kaolin at a mass ratio of 1:20, so that the activated kaolin is evenly coated on the surface of the ball. Coating time was controlled within 10 minutes; then dried at 120°C for 2 hours, and the dried product was sieved to remove excess kaolin powder to obtain shell-core structure PAAS / kaolin composite spherical hygroscopic material PK5-30-2. The average particle diameter of the composite balls is 0.457 cm, and the content of kaolin in the composite particle balls of this embodiment is 29.16%.

[0048] The moisture absorption capacity and moisture absorption rate of PK5-30-2 are 1.36 times that of pure resin balls, such as image 3 shown.

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Abstract

The invention relates to a super absorbent resin / kaolin composite sphere moisture absorption material with a shell-core structure and a preparation method thereof. The composite sphere moisture absorption material comprises porous spheres and the porous sphere comprises a super absorbent resin matrix serving as a core part and a shell layer wrapping the core part, the shell layer is a composite porous transmission layer formed by compounding kaolin and super absorbent resin, and the content of kaolin in the composite sphere moisture absorption material is 25-40 wt%. Furthermore, the preparation method uses the super absorbent resin as a matrix, a kaolin-macromolecule composite porous transmission shell layer is constructed on the surface of the super absorbent resin through the steps of activation, swelling, coating, drying, screening and the like, the composite porous transmission shell layer absorbs water vapor in a gas phase to form liquid water and then transmits the liquid water to core macromolecule resin, the moisture absorption mechanism of original super absorbent resin is changed, and the moisture absorption performance of the super absorbent resin is improved. Accordingto the prepared composite particle ball, the maximum moisture absorption capacity and moisture absorption rate within 10 hours reach 1.95 times of those of original resin, the moisture absorption rateis increased by 30% compared with that of the original resin, and the size of the composite particle ball can be regulated and controlled.

Description

technical field [0001] The invention belongs to the technical field of composite moisture-absorbing materials, and specifically refers to a shell-core structure superabsorbent resin / kaolin composite ball moisture-absorbing material and a preparation method thereof. Background technique [0002] The humidity in the air has a great impact on human production and life. Excessive humidity will have adverse effects on our health, crop growth, and storage of items. Hygroscopic materials reduce air humidity by absorbing moisture from the environment. Hygroscopic materials are roughly divided into organic polymer materials, inorganic salts, mineral materials, and the like. Although inorganic salt hygroscopic materials and mineral materials absorb moisture quickly, their hygroscopic capacity is not high, and inorganic salts are prone to deliquescence and instability. Polymer hygroscopic materials are generally superabsorbent resins modified by physical and chemical methods, and hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/02C08K9/02C08K3/34C08J3/12
CPCC08J3/12C08J2333/02C08K9/02C08K3/346
Inventor 赵明张生辉
Owner WENZHOU UNIVERSITY
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