Salt alkali resistance water preserving agent and its preparation method

A water-retaining agent and saline-alkali-resistant technology, which are applied in chemical instruments and methods, organic fertilizers, fertilizer mixtures, etc., can solve problems such as weak gel strength and gel strength, and achieve the advantages of preventing soil compaction, simple preparation process and cost reduction. Effect

Inactive Publication Date: 2005-03-09
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantage is that the inorganic additives in the composite resin are attached to the network structure of the polymer, and its gel strength is obviously weaker than that of the composite material in which the inorganic filler and the organic monomer exist in the form of graft copolymerization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Soak the natural attapulgite in concentrated hydrochloric acid for 24 hours, dry it at 120°C until it reaches a constant weight, and crush it for later use. Put 2 grams of attapulgite in a beaker, add 10 mL of distilled water, and stir vigorously for 30 minutes. Weigh 4.2 g of acrylic acid and 2.13 g of acrylamide, add 15 mL of distilled water, stir, and dropwise add 4 mL of 5M sodium hydroxide. Under the protection of nitrogen, add the attapulgite liquid that has been stirred into a suspension dropwise into the mixed solution of acrylic acid and acrylamide, then add 0.0143 g of crosslinking agent, stir for 30 minutes and then add 0.0713 g of initiator. Raise the temperature to 70°C and keep it for 3-5 hours. The product was dried at 70°C until constant weight, crushed, and passed through a 40-mesh sieve.

[0019] The product in the present embodiment absorbs 1414 grams of distilled water per gram, absorbs 117 grams of 0.9% NaCl solution, and the color and luster is l...

Embodiment 2

[0021] Soak the natural attapulgite in concentrated hydrochloric acid for 24 hours, dry it at 120°C until it reaches a constant weight, and crush it for later use. Put 1.44 g of attapulgite in a beaker, add 20 mL of distilled water, and stir vigorously for 30 minutes. Weigh 8.4 g of acrylic acid and 4.26 g of acrylamide, add 40 mL of distilled water, stir, and dropwise add 8 mL of 5 mole sodium hydroxide. Under the protection of nitrogen, add the attapulgite liquid that has been stirred into a suspension into the mixed solution of acrylic acid and acrylamide, then add 0.0286 g of crosslinking agent, stir for 30 minutes and then add 0.1426 g of initiator. Raise the temperature to 90°C and keep it for 3-5 hours. The product was dried at 70°C until constant weight, crushed, and passed through a 40-mesh sieve.

[0022] The product in the present embodiment absorbs 1247 grams of distilled water per gram, absorbs 105 grams of 0.9% NaCl solution, and the color and luster is light y...

Embodiment 3

[0024] Soak the natural attapulgite in concentrated hydrochloric acid for 24 hours, dry it at 120°C until it reaches a constant weight, and crush it for later use. Put 0.64 g of attapulgite in a beaker, add 10 mL of distilled water, and stir vigorously for 30 minutes. Weigh 4.2 g of acrylic acid and 1.42 g of acrylamide, add 15 mL of distilled water, stir, and dropwise add 4 mL of 5 mole sodium hydroxide. Under the protection of nitrogen, add the attapulgite liquid that has been stirred into a suspension dropwise into the mixed solution of acrylic acid and acrylamide, then add 0.0127 g of crosslinking agent, stir for 30 minutes and then add 0.0633 g of initiator. Raise the temperature to 80°C and keep it for 3-5 hours. The product was dried at 70°C until constant weight, crushed, and passed through a 40-mesh sieve.

[0025] Every gram of the product in this embodiment absorbs 1098 grams of distilled water and 100 grams of 0.9% NaCl solution, and its color is light yellow.

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Abstract

A water-preserving agent resisting to saline and alkali is prepared from acrylic acid, acrylamide and attapulgite through graft copolymerizing under existance of trigger, cross-linking, washing, drying and pulverizing.

Description

technical field [0001] The present invention relates to a saline-alkali-resistant water-retaining agent and a preparation method thereof, and more specifically relates to an organic-inorganic composite water-retaining agent and a preparation method thereof. Background technique [0002] During the actual application of water-retaining agents used in agriculture and forestry, factors such as metal ions in the soil and the pH value of the water environment have a significant impact on their water-absorbing and water-retaining properties. Superabsorbent polymers with thousands of times of water absorption in pure water have only dozens or even several times of water absorption in high-saline areas, which greatly reduces the practical value of water-retaining agents. In addition, the high price of commercialized superabsorbent polymers is also a key problem hindering the large-scale application of superabsorbent polymers in arid areas. At present, water retaining agents are mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40
Inventor 王爱勤李安杨立明刘瑞凤杨军
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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