Water absorbing resin capable of reducing acrylic acid residues and preparation method of water absorbing resin

A water-absorbent resin, acrylic technology, applied in the field of polymer materials, can solve the problems of poor product quality and stability, difficult to control the reaction process, and high acrylic acid residues, and achieve the effect of ensuring the degree of polymerization and crosslinking, reducing the concentration of acrylic acid and ensuring the reaction rate.

Active Publication Date: 2018-05-08
LUNALER HEALTH TECH GUANGZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymerization reaction itself is an exothermic reaction. With the accumulation of heat of reaction, the thermal initiator is consumed too quickly; Fast consumption, the residual acrylic acid is difficult to continue to react, resulting in high residual acrylic acid
The polymerization process produces a large amount of acrylic acid vapor, which has a relatively large negative impact on the environment, equipment, and operators
[0009] For example, patent CN 2016106972186 discloses a method for preparing a urine-resistant water-absorbing resin, which uses heat-induced polymerization, which will lead to the disadvantages of severe reaction and difficult control, high residual acrylic acid, and product quality and stability need to be improved

Method used

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  • Water absorbing resin capable of reducing acrylic acid residues and preparation method of water absorbing resin
  • Water absorbing resin capable of reducing acrylic acid residues and preparation method of water absorbing resin
  • Water absorbing resin capable of reducing acrylic acid residues and preparation method of water absorbing resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A water-absorbent resin for reducing acrylic residues, comprising the following components in parts by weight:

[0039] 30 parts of acrylic acid; 30 parts of deionized water; 40 parts of 32% sodium hydroxide aqueous solution; 5 parts of acrylic amine; 1 part of the mixture of hexyl phenyl ketone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide with a mass ratio of 4:1; the mass ratio of initiator potassium persulfate and hydrogen peroxide is 1:1 1 part of the mixture.

[0040] (1) Mix 30 parts of acrylic acid and 30 parts of deionized water, then add 40 parts of 32% sodium hydroxide aqueous solution for neutralization reaction, and control the reaction temperature <40°C;

[0041] (2) Add 5 parts of acrylic amine, 1 part of crosslinking agent, 1 part of photoinitiator, and 0.5 part of initiator in sequence; a mixed solution is obtained;

[0042] (3) The mixed solution is treated in a water bath, and the water temperature is controlled to be less than 20°C.

[0043] ...

Embodiment 2

[0047] A water-absorbent resin for reducing acrylic residues, comprising the following components in parts by weight:

[0048]40 parts of acrylic acid; 40 parts of deionized water; 50 parts of 32% sodium hydroxide aqueous solution; 8 parts of acrylic acid amine; 1.5 parts of a mixture of hexyl phenyl ketone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide with a mass ratio of 4:1; the mass ratio of initiator potassium persulfate and hydrogen peroxide is 1:1 0.8 parts of the mixture.

[0049] (1) Mix 40 parts of acrylic acid and 40 parts of deionized water, then add 50 parts of 32% aqueous sodium hydroxide solution, and control the reaction temperature <40°C;

[0050] (2) Add 8 parts of acrylic amine, 1.5 parts of crosslinking agent, 1.5 parts of photoinitiator, and 0.8 parts of initiator in sequence; a mixed solution is obtained.

[0051] (3) Carry out air-cooling treatment to the mixed solution, and control the air < ​​20°C.

[0052] (4) Use intensity 30uw / cm 2 The mixe...

Embodiment 3

[0056] A water-absorbent resin for reducing acrylic residues, comprising the following components in parts by weight:

[0057] 50 parts of acrylic acid; 50 parts of deionized water; 60 parts of 32% sodium hydroxide aqueous solution; 10 parts of acrylic amine; 2 parts of the mixture of hexyl phenyl ketone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide with a mass ratio of 4:1; the mass ratio of initiator potassium persulfate and hydrogen peroxide is 1:1 1 part of the mixture.

[0058] (1) Mix 50 parts of acrylic acid and 50 parts of deionized water, then add 60 parts of 32% by mass aqueous sodium hydroxide solution for neutralization reaction, and control the reaction temperature < 40°C;

[0059] (2) Add 10 parts of acrylic amine, 2 parts of crosslinking agent, 2 parts of photoinitiator, and 1 part of initiator in sequence; a mixed solution is obtained.

[0060] (3) The mixed solution is treated in a water bath, and the water temperature is controlled to be less than 20°C...

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PUM

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Abstract

The invention provides a water absorbing resin capable of reducing acrylic acid residues and a preparation method of the water absorbing resin. The preparation method is characterized by comprising the following steps: neutralizing an aqueous solution of acrylic acid by using liquid caustic soda, and sequentially adding a polymerization monomer, a cross-linking agent, a photoinitiator and an initiator; placing the mixed solution into a water bath or blowing cold air to the mixed solution; carrying out a polymerization reaction on the mixed solution under an ultraviolet lamp to obtain a transparent colloid; and pelleting the colloid, and performing drying and crushing to obtain a product. The preparation method does not need introducing nitrogen to remove oxygen, so that the preparation method is simple in operation; the polymerization efficiency is increased by the interaction among the initiators; the water bath or the cold air can bring away heat generated by polymerization in time so as to enhance the polymerization and cross-linking degrees; and compared with single ultraviolet polymerization and thermal-initiated polymerization, the preparation method is better in cross-linking degree, shorter in polymerization period, free of acrylic acid gas in the polymerization process, more friendly to environment, strong in controllability and low in acrylic acid residues.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a water-absorbing resin for reducing acrylic acid residues and a preparation method thereof. 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] Acrylic acid is the main synthetic raw material of water-absorbent resin, which is highly corrosive and physiologically toxic. The residual amount of acrylic acid in water-absorbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/56C08F222/38C08F2/48
CPCC08F2/48C08F220/06C08F220/56C08F222/385
Inventor 周彧峰
Owner LUNALER HEALTH TECH GUANGZHOU CO LTD
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