Preparation method for foaming type nutrient composite water-retaining agent

Abstract

The invention provides a preparation method for a foaming type nutrient composite water-retaining agent and belongs to the field of composite materials. Plant ash, acrylamide and palygorskite clay rude ore are adopted as raw materials, potassium persulfate is adopted as an initiating agent, N,N'-methylene-bisacrylamide and the like are adopted as cross-linking agents, ammonium bicarbonate is adopted as a foaming agent, the copolymerization of an aqueous solution is initiated through a free radical to obtain the composite water-retaining agent which has the effects of high water absorption velocity, large water absorption capacity, long water retaining time, good salinity tolerance and high gel strength. Through the addition of the natural fertilizer plant ash, the water-retaining agent isendowed with the advantage of being rich in nutrient elements, thereby being more suitable for the fields of crop planting and desertification environment remediation. The palygorskite clay rude ore is adopted as the main raw material, the addition of inorganic substances is high, so as to greatly reduce the cost of the water-retaining agent; besides, the preparation technology of the composite water-retaining agent is simple, the operation is convenient, and industrialization is facilitated.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to the preparation of a composite water-retaining agent, in particular to a preparation method of a foaming nutritional composite water-retaining agent. Background technique [0002] Since the relevant application information of water-absorbing composite materials was reported by the Northern Research Institute of the United States in the early 1970s, water-absorbing composite materials have attracted great research interest from researchers, and their applications include industry, horticulture, agriculture, food industry, healthcare and other fields. Among them, the application of water-absorbing composite materials in agriculture has shown encouraging experimental results. Water-absorbing composite materials can help reduce irrigation times, save water resources, increase plant survival rates, and improve soil fertility. At present, water-retaining agents can be divide...

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Problems solved by technology

For example: Chinese patent (CN 101143957A) discloses an acid heat treatment attapulgite composite water-retaining agent and its preparation method. The disadvantage is that the heat treatment temperature of attapulgite should reach hundreds of degrees, which requires harsh reaction conditions and does not use industrial production.

[0005]2. Waste plant straw additives: This type of water-absorbing resin is added with modified plant straw, mainly including wheat straw, corn bracts, corn straw, sorghum straw, Sugarcane waste, potato stalks, etc., but all such water-retaining agents reported so far have been subjected to alkali treatment before the addition of straw. In essence, only one of the substances in the straw-crude fiber is used, so they are not straw in the true sense. Aquasorb

[0006]3. Starch additives: This kind of superabsorbent resin mainly uses various starches and starches modified by organic matter grafting as the main additives, such as used in Chinese patent CN102093513A Potato starch and acrylic acid are used to prepare superabsorbent resin. The disadvantage of this method is that it consumes a large amount of food crops, which will affect food security to a certain extent. In addition, the cost of this type of water retaining agent is high.

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