Biodegradable agricultural water retaining material and preparation method thereof

Abstract

The invention relates to a biodegradable agricultural water retaining material and a preparation method thereof. The biodegradable agricultural water retaining material comprises the following components in percentage by weight: 10-30 percent of biodegradable resin, 10-30 percent of a water-absorbing monomer, 0.1-1 percent of a radical initiator, 20-60 percent of a renewable material, 10-15 percent of polyhydric alcohol and 5-10 percent of water. The preparation method comprises the following steps: uniformly mixing various components in a mixer, extruding the materials in a twin-screw extruder, naturally foaming strips, performing air-cooling cooling, and finally granulating through a granulator, and crushing and screening to obtain porous water retaining particles. The biodegradable agricultural water retaining agent can be biodegraded, does not influence the components of soil, and is high in saline-alkaline resistance; and moreover, the preparation method is simple, vacuum is not required, the production efficiency is high, and the cost is low.

Description

technical field [0001] The invention belongs to the field of composite materials and relates to a water-retaining agent, in particular to a biodegradable agricultural water-retaining material and a preparation method thereof. Background technique [0002] Water-retaining materials have a wide range of applications, especially in agricultural moisture retention and soil improvement, which have excellent application prospects. However, at present, water-retaining materials mainly include three categories: acrylic, starch and cellulose. At present, the most widely used and the largest production volume is acrylic water retaining agent, which has the advantages of strong water absorption and fast water absorption, but the disadvantage is that it cannot be degraded, has poor water release ability, and has poor salt and alkali resistance. The advantages of starch-based water retaining agents are low cost, biodegradation, and no soil pollution, but the disadvantages are poor salt ...

AI Technical Summary

Problems solved by technology

Although the water-retaining agent has good water absorption, it can also be degraded, but the production method needs to first soak the attapulgite in hydrochloric acid for 24 hours, then copolymerize it with acrylamide, starch, etc. for 3-5 hours, and then wash it with alkali for 1 hour. Finally, it is dried for a long time to constant weight. The production efficiency of this production method is too low, and attapulgite is an inorganic filler, which will affect the components of the soil after long-term use.