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A treatment method for improving surface crosslinking of water-absorbent resin by vacuum negative pressure

The technology of a water-absorbent resin and a processing method is applied in the treatment field of improving the surface cross-linking of the water-absorbent resin by vacuum negative pressure, and can solve the problems of the water-absorbent resin being degraded in water absorption, unable to absorb organic solvents, hidden dangers of the preparation process, etc., so as to improve the speed and reduce the temperature, the effect of improving the working environment

Active Publication Date: 2021-06-11
LUNALER HEALTH TECH GUANGZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the water-absorbent resin itself cannot absorb organic solvents, and there is no step for recovering organic solvents in the existing surface treatment process, organic solvents usually remain in the water-absorbent resin
If the organic solvent remains in the water-absorbent resin, the water-absorbing performance of the water-absorbent resin will decrease, and it may also cause irritation to human skin
Generally speaking, the water-absorbent resin used in diapers must meet the national standards before it can be marketed, so the residual organic solvents in the water-absorbent resin will not cause obvious adverse effects on users; but since infants and young children are the main population of diapers , whose skin is far more delicate and fragile than that of adults. Therefore, even if the existing water-absorbent resin used in baby diapers and other products whose organic solvent residues meet the national standards, the residual amount is close to the critical point, it may still be harmful to the Irritation of the skin of infants and young children, causing problems such as rashes
[0005] In addition, due to the high volatility of organic solvents, there is an inevitable heating process in the preparation of water-absorbent resins, and organic solvents are more likely to volatilize in the air. At the same time, most organic solvents are flammable. There is a risk of explosion in the process, so the existing water-absorbent resin preparation process has potential safety hazards

Method used

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  • A treatment method for improving surface crosslinking of water-absorbent resin by vacuum negative pressure
  • A treatment method for improving surface crosslinking of water-absorbent resin by vacuum negative pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) 100 parts by mass of water-absorbent resin particles to be treated and 6 parts by mass of surface treatment liquid are placed in a stirrer;

[0031] The water-absorbing resin particles to be treated are 20-120 mesh sodium acrylate-acrylic acid copolymer particles, wherein the proportion of 20-80 mesh is 90%.

[0032] The surface treatment liquid is deionized water, methanol, aluminum sulfate, fatty alcohol polyoxyethylene ether, 1,2-propylene glycol, polyethylene glycol diglycidyl ether mixed according to the mass ratio of 6:3:1:0.4:0.5:0.1 solution.

[0033] (2) Set the stirrer speed to 20r / min, set the thermostat temperature to 150°C; set the vacuum degree of the vacuum pump to 0.04Mpa;

[0034] (3) Simultaneously turn on the switches of the thermostat, vacuum pump, agitator, condenser, water outlet pump and water inlet pump, and run the above equipment for 60 minutes;

[0035] (4) Use a recovery tank to collect the organic solvent components condensed by the co...

Embodiment 2

[0037] (1) 100 parts by mass of water-absorbing resin particles to be treated and 8 parts by mass of surface treatment liquid are placed in a stirrer;

[0038] The water-absorbing resin particles to be treated are 20-120 mesh sodium acrylate-acrylic acid copolymer particles, wherein the proportion of 20-80 mesh is 95%.

[0039] The surface treatment liquid is deionized water, methanol, aluminum sulfate, fatty alcohol polyoxyethylene ether, 1,2-propylene glycol, polyethylene glycol diglycidyl ether mixed according to the mass ratio of 6:3:1:0.4:0.5:0.1 solution.

[0040] (2) Set the stirrer speed to 30r / min, set the thermostat temperature to 160°C; set the vacuum degree of the vacuum pump to 0.05Mpa;

[0041] (3) Simultaneously turn on the switches of the thermostat, vacuum pump, agitator, condenser, water outlet pump and water inlet pump, and run the above equipment for 50 minutes;

[0042] (4) Use a recovery tank to collect the organic solvent components condensed by the co...

Embodiment 3

[0044] (1) 100 parts by mass of water-absorbing resin particles to be treated and 10 parts by mass of surface treatment liquid are placed in a stirrer;

[0045]The water-absorbing resin particles to be treated are 20-120 mesh sodium acrylate-acrylic acid copolymer particles, wherein the proportion of 20-80 mesh is 91%.

[0046] The surface treatment liquid is deionized water, ethanol, aluminum sulfate, fatty alcohol polyoxyethylene ether, 1,2-propylene glycol, polyethylene glycol diglycidyl ether mixed according to the mass ratio of 6:3:1:0.4:0.5:0.1 solution.

[0047] (2) Set the stirrer speed to 40r / min, set the thermostat temperature to 160°C; set the vacuum degree of the vacuum pump to 0.06Mpa;

[0048] (3) Simultaneously turn on the switches of the thermostat, vacuum pump, agitator, condenser, water outlet pump and water inlet pump, and run the above equipment for 60 minutes;

[0049] (4) Use a recovery tank to collect the organic solvent components condensed by the con...

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Abstract

A treatment method for improving surface crosslinking of water-absorbing resin under vacuum negative pressure, comprising the following steps: (1) taking 100 parts by mass of water-absorbing resin particles to be treated and 6-15 parts by mass of surface treatment liquid in a stirrer; (2) Set the vacuum pump to be connected with the stirrer, and set the vacuum degree of the vacuum pump to be 0.04Mpa-0.08Mpa; (3) The stirrer is stirred and operated for 40-60min in a vacuum environment; The organic solvent component in the volatilized surface treatment liquid. The invention improves the surface treatment process of the absorbent resin through vacuum negative pressure, which can significantly reduce the amount of organic solvents remaining in the water-absorbent resin product, and at the same time can increase the speed of the surface treatment process during the preparation process and basically prevent the staff from contacting organic solvents. Solvent; and can effectively recycle and reuse organic solvents.

Description

technical field [0001] The invention belongs to the field of macromolecule materials, and in particular relates to a treatment method for improving cross-linking of water-absorbing resin surface by vacuum negative pressure. Background technique [0002] Super Absorbent Polymer (SAP) is a new type of functional polymer material with a large number of hydrophilic groups. It has a high water absorption function of absorbing water hundreds to thousands of times heavier than itself, and has excellent water retention performance. Once it absorbs water and swells into a hydrogel, it is difficult to separate the water even if it is pressurized. Water-absorbing resins are widely used and have a very broad application prospect. The main purpose is mainly sanitary materials, accounting for about 70% of the total market. [0003] The preparation process of the water-absorbent resin mainly includes the steps of neutralization, polymerization, granulation, drying, pulverization, surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08J11/02C08L33/02
CPCC08J3/24C08J11/02C08J2333/02
Inventor 周彧峰
Owner LUNALER HEALTH TECH GUANGZHOU CO LTD