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Organic-inorganic composite water-retaining agent and its preparing method

An inorganic composite and water-retaining agent technology, applied in organic fertilizers, chemical instruments and methods, fertilizer mixtures, etc., can solve problems such as weak gel strength and weak gel strength, achieve high water absorption, enhance soil aggregate structure, and prevent soil compaction. Effect

Inactive Publication Date: 2003-08-27
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

[0016] Soak natural attapulgite with hydrochloric acid for 24 hours, wash with distilled water until neutral, and bake at 120°C until constant weight. Put 2 grams of attapulgite in a beaker, add 30 mL of distilled water, and stir vigorously for 30 minutes. Weigh 16 grams of acrylic acid, add 20 milliliters of distilled water, and add 20 milliliters of 30% sodium hydroxide dropwise under stirring. Add the attapulgite liquid that has been stirred into a suspension dropwise into acrylic acid, then add 0.01 g of a crosslinking agent, stir for 30 minutes, and then add 0.0180 g of an 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. Every gram of the product absorbs 1389 grams of distilled water and 117 grams of 0.9% NaCl solution, and its color is light yellow.

Embodiment 2

[0018] Soak natural attapulgite with hydrochloric acid for 24 hours, wash with distilled water until neutral, and bake at 120°C until constant weight. Put 10 grams of attapulgite in a beaker, add 130 mL of distilled water, and stir vigorously for 30 minutes. Weigh 80 grams of acrylic acid, add 100 milliliters of distilled water, and add 5 moles of sodium hydroxide dropwise under stirring. Add the attapulgite liquid that has been stirred into a suspension dropwise into acrylic acid, then add 0.18 grams of crosslinking agent, stir for 30 minutes, and then add 0.9 grams 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. Every gram of the product absorbs 1017 grams of distilled water and 87 grams of 0.9% NaCl solution, and its color is pale yellow.

Embodiment 3

[0020] Soak natural attapulgite with hydrochloric acid for 24 hours, wash with distilled water until neutral, and bake at 120°C until constant weight. Put 100 grams of attapulgite in a beaker, add 1000 mL of distilled water, and stir vigorously for 30 minutes. Weigh 900 grams of acrylic acid, add 800 milliliters of distilled water, and add 10 moles of sodium hydroxide dropwise under stirring. Add the attapulgite drop that has been stirred into a suspension into acrylic acid, then add 3 grams of crosslinking agent, stir for 30 minutes, and then add 10 grams 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. Every gram of the product absorbs 926 grams of distilled water and 84 grams of 0.9% NaCl solution, and its color is pale yellow.

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Abstract

The invention is an organic-inorganic compound water-keeping agent and the making method, making graft copolymerization, cross-linking, washing, dryness and crushing on crylic acid partly neutralized and concave-convex stick earth by evocating agent. The quality multiple of absorbing distilled water of its dry matter is 500-1500, that of absorbing 0.9 % NaCl solution, 80-150.

Description

technical field [0001] The invention relates to an organic-inorganic composite water-retaining agent, more specifically to a polyacrylic acid-attapulgite composite water-absorbing agent and a preparation method thereof. Background technique [0002] Water-retaining agents have been widely used in many fields, especially in agriculture and forestry, such as water saving and moisturizing, soil improvement, seed coating, root dipping of seedlings, and preservation of fruits and vegetables. Due to the high cost of general water-retaining agents, and their poor salt and alkali resistance and pertinence, their popularization and application in agriculture, forestry, horticulture and other aspects are limited. At present, water retaining agents are mainly divided into three categories according to the source of raw materials: starch, cellulose and acrylic acid. Starch water retaining agents generally have high water absorption, but their disadvantages are poor salt and alkali resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C09K17/00
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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