Coal-based agricultural and forestry water-retaining agent with high mechanical strength and preparation method thereof

Abstract

The present invention now provides a coal-based agricultural and forestry water-retaining agent with high mechanical strength and its preparation method. The raw materials include lignite, macromolecular monomer, crosslinking agent and initiator, and the above raw materials are polymerized in an aqueous solution to form a coal-based The agricultural and forestry water-retaining agent, the weight percent of the raw materials is: lignite 10-90%; polymer monomer 5-50%; cross-linking agent 0.01-0.5%; initiator 0.05-0.5%. Experiments prove that the coal-based agricultural and forestry water-retaining agent of the present invention has high water absorption ratio, fast water absorption rate, strong electrolyte resistance and high mechanical strength.

Description

technical field [0001] The invention belongs to the field of preparation of agricultural and forestry production materials, and in particular relates to a coal-based agricultural and forestry water-retaining agent with high mechanical strength and a preparation method thereof. Background technique [0002] Water-retaining agent is a new type of functional polymer material, which can quickly absorb hundreds of times its own weight of water after contacting water molecules, and the absorbed water is not easy to separate out under pressurized conditions. When the environmental conditions are dry, the water-retaining agent that has absorbed water can gradually release the water, which can be used by plants. Therefore, water-retaining agents have a wide range of uses in water saving, water retention, drought resistance, desert control, soil improvement, afforestation, agricultural planting and other fields. However, according to the actual application situation in the field of a...

AI Technical Summary

Problems solved by technology

However, according to the current practical application in the fields of agricultural planting and afforestation, the performance defects of water-retaining agents are obvious: (1) Low mechanical strength, easy to break in soil

(2) Poor salt and alkali resistance

(3) Repeated water absorption capacity is poor

(4) It is easy to cause soil compaction

(5) The price is expensive, usually the market price of this kind of water-retaining agent is more than 28,000 yuan / ton, which cannot be used as a basic agricultural production material

(6) Single performance

(7) Poor compatibility with nitrogen, phosphorus and potassium fertilizers normally applied to crops

more expensive

[0005] (2) Due to the limitation of the current technical level, the raw materials of agricultural and forestry water-retaining agents produced by most manufacturers are not suitable for direct application in soil

After application, it often causes soil acidification, soil compaction, and the destruction of the original aggregate structure of the soil.

[0006] (3) Due to the nature of the raw materials selected by the agricultural and forestry water-retaining agents currently on the market, their mechanical strength is very low and they are easily broken in the soil

[0007] (4) Due to the nature of the raw materials selected by the agricultural and forestry water-retaining agents currently on the market, their acid, alkali and salt resistance properties are poor, resulting in poor repeated water absorption capacity in the soil

[0008] (5) Due to the nature of the raw materials selected by the agricultural and forestry water-retaining agents currently on the market, most of the products not only do not have any ability to promote the absorption of nutrients needed by plants, but also affect the use effect of chemical fertilizers

[0009] (6) Due to the physical properties of the product, the agricultural and forestry water-retaining agents currently on the market may cause poor air permeability of the soil

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