Type of water retaining agent

Introduction: water retaining agent is an important scientific and technological achievement of the National 863 program The product is non-toxic and harmless It has the characteristics of strong water absorption, large water retaining capacity and long validity period What about the type of water retaining agent? Come and have a look with you! Water retaining agent is a kind of super absorbent resin, which contains a large number of super absorbent groups with specific structure It can produce high-permeability Association in the resin and absorb water through its mesh structure What about the type of water retaining agent? Let's introduce the small edition of Baibai safety net! At present, there are two kinds of water retention agents at home and abroad: one is acrylamide acrylate copolymer crosslinker (polyacrylamide, sodium polyacrylate, potassium polyacrylate, ammonium polyacrylate, etc.); the other is starch grafted acrylate copolymer crosslinker (starch grafted acrylate) Polyacrylamide: polyacrylamide is a white granular crystal Its main components are: acrylamide 65% - 66%, potassium acrylate 23% - 24%, water 8% - 10%, crosslinker 0.5% - 1.0% Internationally, most of the water retention agents produced in France, Germany, Japan, the United States and Belgium belong to this kind of products The product is characterized by long service cycle and life, and its water storage and moisture conservation capacity in the soil can be maintained for about 4 years, but its water absorption capacity will decrease year by year According to the observation of afforestation experiment in loess area, the water absorption rate of the water retaining agent is maintained at 100-120 times in the same year after afforestation, which is reduced by 20% - 30% in the second year, 40% - 50% in the third year and more in the fourth year Sodium polyacrylate: sodium polyacrylate is a white or light gray granular crystal, the main components are: sodium polyacrylate 88% (including 24.5% sodium), water 8% - 10%, crosslinker 0.5% - 1.0% Most of the water retention agents produced in China are products of this composition Its main characteristics are: high water absorption rate, fast water absorption speed, but the water retention performance can only be maintained for 2 years According to the observation of afforestation experiment, the water absorption capacity and water absorption rate of this kind of products are significantly higher than that of polyacrylamide products In case of sufficient water supply in the soil, it will quickly absorb 130-140 times of its own weight after 0.5-1.0 hours; however, the water absorption rate in the second year will be reduced by about 60% Due to the increase of sodium ion content in soil caused by sodium polyacrylate, most of the manufacturers of water retaining agent for forestry and agriculture changed to produce potassium polyacrylate or ammonium polyacrylate Starch grafted acrylate: starch grafted acrylate is white or light yellow granular crystal, the main components are: starch 18% - 27% acrylate 62% - 71% water 10% crosslinker 0.5% - 1.0% When the product is used for water storage and moisture conservation of afforestation land, its service life can only last for more than 1 year, but its water absorption rate and water absorption speed are excellent According to the laboratory comparative test of water absorption of loess extract, this kind of water retaining agent can absorb 150-160 times of its own weight within 15-20 minutes after encountering water The above is a small edition for you to introduce some of the types of water retaining agent, I hope to help you oh! If you want to know more about food safety Please pay more attention to Baibai Security Internet bar! Editor in charge: Wang Xiujuan