Thermoplastic starch is also called "non-structured starch", which can make the starch structure disordered and thermoplastic by certain methods. Starch molecules for polysaccharides molecular structure, containing a large number of hydroxyl, due to its intermolecular and intramolecular hydrogen bond action, so that its melting temperature is higher, and its decomposition temperature is lower than its melting temperature, so in the heat processing, starch molecules did not melt and first decomposed. The traditional mechanical processing method of plastic is mostly heat processing, so to make starch - based whole starch plastic needs to make natural starch thermoplastic. This thermoplasticity can be achieved by changing the crystalline structure inside starch molecules. Destroy intramolecular and intermolecular hydrogen bonds, disrupt the double helix crystal structure of starch molecules, which will reduce the melting temperature of starch and make it thermoplastic. Starch-Based Plastics,Cellulose-Based Plastics,Protein-Based Plastics,Some Aliphatic Polyesters Xingbang High Molecular Materials Co., Ltd. , https://www.chemicaladditive.com
Supplementing calcium fertilizer to grow cabbage
During the Chinese cabbage filling period, the phenomenon of "dried heart" often occurs: the plant shape grows normally, the edges of the leaves are immersed in water and there is mucus, and then dehydration, wilting and drying take place very quickly. The mesophyll is translucent and dry paper-like. Cabbage "Dry Heart" is a kind of physiological disease. The main cause is calcium deficiency. When the disease is severe, the leaf ball is hollow, which seriously affects its yield and quality. In addition to measures such as selecting disease-resistant varieties, reasonable watering, increasing organic fertilizer, timely sowing, and strengthening field management, the disease should be supplemented with calcium fertilizer. The specific methods are as follows: 1. Into the heart of Chinese cabbage during the filling period, 16% calcium nitrate granules and 0.5% boric acid bentonite granules are scattered. Second, in the period of Chinese cabbage rosette period to the center of the foliar spray 0.7% calcium chloride solution, spray every 7 to 10 days, and even spray 3 to 5 times. Third, in the Chinese cabbage seedling stage, the rosette period, the core period of spraying respectively 0.7% calcium sulfate solution, spraying 50 kg per acre. In addition, in order to prevent the spread of such diseases, the diseased plants should also be cleared in time.