Watering-fertilizing integration water retention agent, preparation method thereof and application thereof

Abstract

The invention discloses a watering-fertilizing integration water retention agent, a preparation method thereof and an application thereof. The water retention agent is prepared from a water soluble polymerization monomer, bagasse or a bagasse derivative, ground phosphate rock, a free radical polymerization initiator, and a crosslinking agent. The method of the invention, which treats bagasse as araw material, allows an agricultural waste resource to be effectively utilized, and the cheap and abundant ground phosphate rock is added in the method, so the cost of a product (the water retention agent) of the invention is low. In addition, the ground phosphate rock, which is also used as a raw material in the method of the invention, can be reacted with residual acidic monomers and can release water-soluble phosphor which can be absorbed by plants, so the poisoning effect brought by the residual acidic monomers is substantially reduced; and the ground phosphate rock can stably and durablymaintain and release nutrients needed by the growth of crops through a swelling effect under the effect of a sustained and controlled release system of the water-retaining agent, so the water retention agent allows soil to be more suitable for the plants to grow and the biological utilization degree of the nutrients in a fertilizer to be improved.

Description

technical field [0001] The invention belongs to the field of agriculture and forestry, in particular to a bagasse or bagasse derivatives (including sulfonated bagasse, phosphorylated bagasse, maleoyl bagasse, succinyl bagasse, bagasse grafted polyamine derivatives) Water-fertilizer integrated water-retaining agent with basic raw materials, bagasse cellulose etherified product, phosphate rock powder and its preparation method and application. Background technique [0002] Water retaining agent (also known as super absorbent resin) is a kind of functional polymer with strong water absorption and water retention capacity. It can absorb water dozens or even thousands of times of itself, and is widely used in agriculture, forestry, gardening, medicine and health. , building materials, daily chemicals and food and other fields. In recent years, droughts have occurred more and more frequently, and have become one of the most severe natural disasters affecting agricultural producti...

AI Technical Summary

Problems solved by technology

The first and second types of water-retaining agents need to be hydrolyzed after polymerization, it is difficult to granulate, and they are easy to lose in the soil

The third type of water-retaining agent has good water absorption and salt tolerance, low cost, but poor stability

The fourth type of water-retaining agent has the strongest water absorption performance and good stability, but its salt tolerance is poor, and its sodium salt will cause soil compaction and salinity. It is generally suitable to use its potassium or ammonium salt in production

[0004] At present, there are many products on the market, including products produced by well-known companies in the United States, Japan and other countries. There are too many residual acrylic acid monomers, and the acidic monomers released after a period of use are harmful to crops, which will cause crop death or yield reduction; second, high cost and high price; third, water absorption and water retention in high saline soil bad

Fourth, the function is single. In addition to supplying water to the crops, it is impossible to add fertilizers to the crops in time

However, these products generally have the following deficiencies: first, the cost of controlled-release fertilizers is high, mainly due to the high cost of controlled-release materials; second, the controlled-release nutrients are single, mainly controlled-release nitrogen fertilizers, and phosphate and potassium fertilizers are rarely controlled-release fertilizers; Ordinary controlled-release fertilizers are severely restricted in nutrient release due to lack of water under drought conditions and cannot play a role

Fourth, the release period of most products is short, and the nutrient release performance is not ideal

Moreover, because phosphate rock powder is decomposed by strong acid to dissociate cations such as calcium, magnesium, iron, aluminum, etc., it has a greater adverse effect on the water retention performance of the composite water retention agent.

Secondly, the phosphorus nutrient after the action of phosphate rock powder and sulfuric acid is very easy to lose after the water-retaining agent absorbs water, and the activation effect of clay is not only doubtful but also easy to settle and difficult to disperse. These problems will lead to the activation effect Poor, making the product poor slow-release fertilizer performance

[0008] Chinese patent 200510018564.9 places bagasse in 60 Co-gamma ray radiation and acrylate graft polymerization prepared into a super absorbent resin, the product can absorb deionized water 200-500 times, but the function is single, unable to control the release of fertilizers

However, there are no reports at home and abroad to prepare water and fertilizer integrated water-retaining agents with agricultural waste resources bagasse or its derivatives and low-cost natural mineral phosphate rock powder as basic raw materials, and there are no such patent applications.