Preparation method of powdery, water-insoluble high hydroscopicity resin capable of adsorbing water, urine or blood and containing low content soluble substance

A super absorbent resin, a technology for absorbing water, applied in absorbent pads, medical science, bandages, etc., can solve the problems of low soluble content, difficult control of polymerization reaction, unstable preparation method, etc. Improve process stability and improve the effect of the operating environment

Active Publication Date: 2007-05-30
FORMOSA PLASTICS CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above problems, the main purpose of the present invention is to provide a powdery, water-insoluble, capable of absorbing water, urine or blood and low soluble content of superabsorbent manufacturing method to solve the existing The polymerization method disclosed by the technology is not easy to control the reaction and the preparation method is unstable, and it also solves the problem that the superabsorbent resin prepared by this preparation method contains relatively high soluble components

Method used

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  • Preparation method of powdery, water-insoluble high hydroscopicity resin capable of adsorbing water, urine or blood and containing low content soluble substance

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preparation example Construction

[0029] The present invention provides a method for preparing a powdery, water-insoluble, superabsorbent resin that can absorb water, urine or blood and has a low soluble content, which at least includes:

[0030] 1) Add a crosslinking agent to the acid group-containing monomer aqueous solution with a neutralization rate of 50 mole% or more. The acid group-containing monomer can be selected from acrylic acid, methacrylic acid, 2-propenylamine-2-methylpropanesulfonic acid or the above A mixture of groups, and the acid group-containing monomer aqueous solution contains 0-5 wt% of water-soluble polymer compounds;

[0031] 2) The acid group-containing monomer solution and the polymerization initiator are retained in the twin-screw mixer for a period of 3 to 600 seconds to provide a gel after the radical polymerization reaction; and

[0032] 3) The gel is dried, crushed, sieved, coated with a surface crosslinking agent at a temperature of 100°C to 250°C with hot air, heated at a tempera...

example 1

[0055] 1) First add 17.35kg of 49% sodium hydroxide aqueous solution and 30.52kg of water into the 100L (liter) reaction tank, then slowly add 22.53kg of acrylic acid to the sodium hydroxide aqueous solution for neutralization under ice bath; The monomer concentration is 38.6wt% aqueous solution, of which 68mol% of acrylic acid is partially neutralized to sodium acrylate.

[0056] 2) Add 33.80 g of glycerol polyethylene glycol triglycidyl ether (n=7) to the partially neutralized aqueous acrylic acid solution, and maintain the temperature at about 20°C.

[0057] 3) Control the flow rate of the sodium acrylate solution to 70.4 kg / hr, so that it enters the twin-screw mixer body from the feed pipe of FIG. 1.

[0058] 4) Control the flow rates of L-ascorbic acid, sodium persulfate and 2,2-azobis(2-amidinopropane) to 12.99g / hr, 162.40g / hr and 162.40g / hr, respectively, and make them pass Figure 2 The feed pipe of the gas enters the twin-screw mixer body.

[0059] 5) Use parallel twin scr...

example 2

[0066] Repeat Example 1, but the residence time of step 5) was changed to 20 seconds, and the viscosity of the discharged reactant was 12.5 cp. Although no polymer was found inside the twin-screw mixer, the viscosity was higher than that of Example 1. It is not easy to disperse on the reactor, and there is a phenomenon that a small part of the local reaction heat is higher; the rest of the steps are the same as in Example 1, and the soluble content of the super absorbent resin obtained by analysis is 3.6%.

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Abstract

The invention discloses a making method of powder-shaped, insoluble, water, urine or blood absorbable low-soluble material high-hydroscopicity resin, which comprises the following steps: adding crosslinking agent in the acid group monomer solution with neutralizing rate over 50%; proceeding free radical polymerization for monomer solution and polymer initiator in the double-screw blender for 3-600s; drying through hot wind at 100-250 deg.c; grinding; sieving; coating surface crosslinking agent; heating surface at 80-230 deg.c; adding inert inorganic salt powder.

Description

Technical field [0001] The invention relates to a preparation method of a super absorbent resin, in particular to a preparation method of a powder, insoluble in water, capable of absorbing water, urine or blood and low in soluble content. Background technique [0002] Super absorbent resin has a strong water retention capacity, can absorb hundreds or even thousands of times its own weight of water, and can swell after absorbing water to maintain a non-flowing state, even if pressure is applied, it will not leak, and is absorbed Water can be released slowly in the atmosphere. Due to the above-mentioned characteristics, it was first used in agriculture and forestry as a soil water-retaining agent. In recent years, due to the considerable progress in the production technology of super absorbent resin, it is also widely used in sanitary products such as diapers, adult incontinence products and women’s hygiene. Water absorbing agent for supplies and fresh-keeping applications for food...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/06C08F4/40C08K3/26B29B7/14A61L15/24
Inventor 黎元中施凯耀钟宏宗吴政璋
Owner FORMOSA PLASTICS CORP
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