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Preparation method of agricultural drought-resistant type water retaining agent with good salt tolerance and low water absorbency

A technology of drought-resistant water-retaining agent and low water absorption, which is applied in the field of agricultural drought resistance and can solve the problems of easy formation of hardening, high osmotic pressure of water-retaining agent, low strength of hydrogel, etc.

Inactive Publication Date: 2015-05-13
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problems are: the high water absorption capacity makes the inside of the water-retaining agent have a high osmotic pressure, and the plants cannot absorb and use the water inside; the hydrogel formed after water absorption has low strength and is easy to form compaction

Method used

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  • Preparation method of agricultural drought-resistant type water retaining agent with good salt tolerance and low water absorbency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix 0.5g of sodium hydroxide with 10ml of distilled water, and slowly add 5ml of acrylic acid dropwise in a cold water bath; add 5g of acrylamide and 0.1g of nano-silica modifier in turn, and react at 70°C for 0.5h under low pressure; take out and mix Add 0.005g of ammonium persulfate initiator and 0.05g of N-N dimethylenebisacrylamide crosslinking agent in turn, and react at 70°C under low pressure for 4 hours, and dry at 70°C to obtain agricultural drought-resistant water-retaining agent .

Embodiment 2

[0019] Mix 1g of sodium hydroxide with 20ml of distilled water, and slowly add 7ml of acrylic acid dropwise in a cold water bath; sequentially add 7g of acrylamide and 0.8ml of a nano-silica modifier with a mass concentration of 1wt%, and react at 70°C for 0.5 h; Take out the mixed solution, add 0.4ml of ammonium persulfate solution with a mass concentration of 1wt% and 6ml of N-N dimethylenebisacrylamide crosslinking agent with a mass concentration of 1wt%, and react at 70°C for 4h under low pressure, and then Drying at 70°C can produce agricultural drought-resistant water-retaining agent.

[0020] Starting from the relationship between structure and performance, by adjusting the amount of nano-silicon modifier, N-N dimethylenebisacrylamide, ammonium persulfate and acrylamide, adjusting the degree of neutralization of acrylic acid and changing the reaction temperature, the resin's Salt tolerance is maximized.

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Abstract

The invention discloses a technology for preparing an agricultural drought-resistant water retaining agent, which belongs to the field of one of the agricultural drought-resistant water retaining technologies. The technology is mainly characterized by comprising the following steps of: initiating the polymerization of acrylic acid and acrylamide monomers by using a nanometer silicon dioxide-ammonium persulfate compound system under a low-pressure heating condition. The water retaining agent prepared by using the technology is quite strong in salt resistance (70-120 times in absorbing normal saline), and proper in water absorbency (300-500 times), can resist drought and retain water in soil, simultaneously does not compete for water with plants, does not harden, and therefore can be widely applied to the fields of agriculture and desertification control for drought resistance and water retaining.

Description

technical field [0001] The invention belongs to the technical field of agricultural drought resistance, and in particular relates to a preparation method of an agricultural drought-resistant water-retaining agent with good salt tolerance and low water absorption rate using a nano-modifier. Background technique [0002] Water retaining agent is a new type of functional polymer material, which can absorb hundreds to thousands of times of its own weight in pure water. After water is sucked into the water retaining agent, it will not come out even if pressure is applied. It can also absorb water repeatedly and release water slowly. Therefore, it has been widely used in agriculture, forestry, horticulture, chemical industry, environmental protection and other fields. [0003] Since the 1990s, grand projects such as the "Green Earth Project" and "Desert Control Project" have been launched one after another in the world, and superabsorbent resins have gradually played an increasing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F222/38C08F2/44C08K3/36C09K17/40
Inventor 王海旺邢艺飞成美玲倪冬冬魏新芳王海新
Owner 东北大学秦皇岛分校
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