Starch grafting acrylic acid compound water-retaining agent and production method thereof

A technology of water-retaining agent and acrylic acid, applied in the field of materials, can solve the problems of low repeated water absorption, poor resistance to salinity and alkali, and no industrialized production yet.

Active Publication Date: 2012-03-14
SHANGHAI ZHONGWEI BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw material cost of starch-based water-absorbing agent is low, environmentally friendly, and easy to degrade. However, there are disadvantages such as poor salt and alkali resistance, low strength, low water absorption rate, and low repeated water absorption rate.
However, there are no reports of industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Weigh 270 grams of acrylic acid, 27 grams of acrylamide, and 13.4 grams of tapioca starch, and add them to the neutralization tank. Stir and add 168 grams of potassium hydroxide to 250 grams of water to prepare a neutralizing solution (prepared). Slowly add the neutralizing solution to the neutralizing tank to keep the temperature of the material at 80-85°C. After the completion of the heat preservation for half an hour, the temperature is lowered to below 50°C. Add 40.1 grams of dextrin, 20.8 grams of 200 mesh diatomite cooked powder, 15 grams of liquid paraffin, 15 grams of surfactant (OP10), 1.19 grams of ammonium persulfate, 0.21 grams of N, N'-methylenebisacrylamide, Stir evenly, pour into a disk reactor, heat to 78°C, and polymerize. After the reaction was completed, the temperature was lowered to room temperature for granulation, and dried at 80° C. for half an hour.

[0057] It has been determined that each gram of product absorbs 270 grams of distilled water ...

Embodiment 2

[0059] Weigh 270 grams of acrylic acid, 27 grams of acrylamide, and 17.8 grams of tapioca starch, and put them into a neutralization tank. Stir 168 grams of potassium hydroxide and 250 grams of water to prepare a neutralizing solution (prepared). Slowly add neutralizing solution to the neutralization tank, so that the temperature of the material is controlled at 80-85°C, keep the temperature for half an hour, and cool down to below 50°C. Add 40.1 grams of dextrin, 20.8 grams of 200 mesh diatomite cooked powder, 15 grams of liquid paraffin, 15 grams of surfactant (Span-80), 1.19 grams of ammonium persulfate, and 0.21 grams of N,N'-methylenebisacrylamide grams, stirred evenly, poured into a disk reactor, heated to 78°C, and polymerized. After the reaction is completed, the temperature is lowered to room temperature and granulated, and dried at 90° C. for half an hour.

[0060] It has been determined that each gram of product can absorb distilled water 240 grams / 1 hour, 280 gra...

Embodiment 3

[0062] Weigh 270 grams of acrylic acid, 27 grams of acrylamide, and 17.8 grams of tapioca starch, and put them into a neutralization tank. Stir 168 grams of potassium hydroxide and 250 grams of water to prepare a neutralizing solution (prepared). Slowly add neutralizing solution to the neutralization tank, so that the temperature of the material is controlled at 80-85°C, keep the temperature for half an hour, and cool down to below 50°C. Add 40.1 grams of dextrin, 20.8 grams of 200-mesh diatomite cooked powder, 12 grams of kerosene, 15 grams of surfactant (Span-80), 1.19 grams of ammonium persulfate, and 0.21 grams of N,N'-methylenebisacrylamide , stirred evenly, poured into the disc reactor, heated to 78°C, and the polymerization reaction occurred. After the reaction is completed, the temperature is lowered to room temperature and granulated, and dried at 90° C. for half an hour.

[0063] It has been determined that each gram of product absorbs 238 grams of distilled water ...

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PUM

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Abstract

The invention discloses a starch grafting acrylic acid kieselguhr compound water-retaining agent and a production method thereof. The technology is completed by adopting the acrylic acid neutralization and starch pasting in one step, so the production technology is simplified. The monomer concentration is improved, so the polymer is applicable to being processed by a granulator, and the drying energy consumption is reduced at the same time. First, an adherent/surface active agent is added, so the product water absorbing rate is improved, and the granulation is smoother. The water absorbing rate of the product is 270g/h and 290g/2h, and the repeated water absorbing rate is not less than 95%. The color is white, and the strength is good.

Description

technical field [0001] The invention relates to the field of materials, more specifically, the invention relates to a starch-grafted acrylic acid composite water-retaining agent and a manufacturing method thereof. Background technique [0002] In recent years, due to abnormal climate and other reasons, more and more places are troubled by drought and water shortage. For various purposes such as planting grass and trees and preventing desertification, it is necessary to effectively retain water for plant growth. Water-absorbing materials (such as water-absorbing agents) are currently widely used in agriculture and some other fields. For water-absorbent resins that are mainly used in soil to absorb and retain water, there are certain requirements for the water-absorbing agent's water absorption rate, resin strength, and degradability. [0003] At present, high-performance water-absorbing agents are mainly divided into two categories. One is chemically synthesized polymer wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/02C08K3/34C08F251/00C09K17/32
Inventor 张士楚周大庆王恒新王访林
Owner SHANGHAI ZHONGWEI BIOCHEM
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