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Segmented drying method for starch system water-absorbent resin

A water-absorbent resin and segmented drying technology is applied in the field of preparation of starch-based water-absorbent resins, which can solve problems such as affecting the water-absorbent properties of water-absorbent resins, and achieve the effects of facilitating continuous industrial production, not affecting water-absorbent properties, and taking less time.

Active Publication Date: 2016-08-24
SAAS BIOTECH & NUCLEAR TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] All in all, the existing drying process is fixed at the same temperature, the lower the temperature, the longer it will take, and the higher the temperature will affect the water absorption performance of the water-absorbent resin

Method used

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  • Segmented drying method for starch system water-absorbent resin

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Embodiment Construction

[0020] The following non-limiting examples illustrate the invention. Examples and comparative examples are carried out under the same oven and the same sample size.

[0021] A method for drying starch-based water-absorbent resins, including cut and minced gel blocks, which are formed by reacting raw materials such as acrylic acid, starch, and alkali, and then polymerized by irradiation. For example, the preparation method is as follows:

[0022] 1. Formula (parts by weight):

[0023] 45-65 parts of acrylic acid, 10-40 parts of potassium hydroxide, 5-30 parts of diammonium hydrogen phosphate, 0.05-5 parts of glycerol, and 1-10 parts of pregelatinized starch.

[0024] 2. Steps:

[0025] (1) Neutralization reaction: add water to pre-gelatinized starch and stir for 15-30 minutes to make gelatinized liquid, slowly add potassium hydroxide and diammonium hydrogen phosphate to dissolve, then slowly add acrylic acid for neutralization, finally add glycerin and mix well ;

[0026] (...

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Abstract

The invention discloses a segmented drying method for starch system water-absorbent resin, and belongs to the field of water-absorbent resin preparation. According to the method, cut and ground gel blocks are included; the method comprises the following steps of first-segment drying, wherein at the temperature of 150 DEG C to 200 DEG C, drying is carried out till the water content of a material ranges from 10% to 20%; second-segment drying, wherein at the temperature lower than 130 DEG C, the material is dried till the water content is smaller than 5%; third-segment drying, wherein cold air blowing is carried out at room temperature, the material is cooled to below 40 DEG C, and the next crushing procedure is directly carried out. The method is short in totally consumed time, the drying efficiency is improved, and the water absorption performance is not influenced.

Description

technical field [0001] The invention belongs to the field of water-absorbent resin preparation, in particular to the preparation of starch-based water-absorbent resin. Background technique [0002] Water-absorbing resin is an organic polymer that can absorb hundreds to thousands of times its own weight in water. It has excellent water retention and repeated water absorption. It has a wide range of uses. It is called a water-retaining agent in agriculture and forestry. It can be used for drought resistance and water retention. , fertilizer preservation and efficiency enhancement, slow release of pesticides, improvement of soil properties, etc.; in terms of medicine and hygiene, it can be used as absorbent materials for sanitary products such as diapers and sanitary napkins, as well as medical supplies such as human body embedding materials and pharmaceutical slow release agents; It can be used as water-proof and waterproof materials, anti-fouling coatings, dew-proof and humid...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/06C08F6/00
CPCC08F6/00C08F251/00C08L51/02C08F220/06
Inventor 魏敏杨平华刘颖严庆海黎青青莉芳王秋平
Owner SAAS BIOTECH & NUCLEAR TECH RES INST
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