In the past two decades, China's animal husbandry and aquaculture industry has developed rapidly and its achievements have been remarkable. So far, China's annual production capacity of only full-price feed has reached more than 90 million tons, and its annual production has exceeded 50 million tons. It is still growing at a faster rate every year, and the development of the western region is in the ascendant. broad. At the same time, the proportion of feed granulation is increasing, and the utilization ratio of cereal raw materials, by-products and animal wastes is also rapidly increasing. Therefore, it is necessary to adapt the binder of these raw material resources to produce better quality pellet feed. For example, when a large proportion of cakes such as cotton aphid, rapeseed, sunflower, flax, and peanut meal is added, a certain amount of binder is added, and the quality of the particles can be better improved. In addition, the addition of fat to the corn-soybean-type feed may also cause problems such as loose particles, so a binder is also required. Binders, also called excipients, are mainly used to process pellet feeds to improve pellet quality (including powder rate, hardness, abrasion resistance), increase production efficiency and extend mold life, and reduce feed dust and particle color. Stable, especially for aquatic fish, shrimps, clams and Other baits need to improve their characteristics of not scattered and not sinking in the water. At present, the research on feed binders at home and abroad is increasingly active, and the developed binders can basically meet the needs of various cultured objects. 1 Classification of feed binders 1.1 Natural Category: (1) The glue secreted by the trees: there are dragon glue, melon gum, pectin and the like. Such binders are susceptible to pH, humidity, mineral salts and the like to reduce viscosity, and thus have not been widely used. (2) Rare earth, clay type binder: Bentonite, clay, sodium soil, attapulgite, etc. These clay minerals have a lower viscosity and a corresponding increase in the proportion of addition. However, the 202 type feed binder developed by Beijing Shenda Mineral Feed Research Institute is not only suitable for steam granulation, but also for cold pressed granules. (3) Plant starch: There are starches such as wheat, corn, cassava, potato, or modified starch. The amount of adhesion of such adhesives depends on the type of starch and the feed processing equipment and handling techniques. (4) Seaweed gum: There are sodium alginate, kelp gum, agar and the like. Seaweed binders generally have strong binding strength, but they are expensive and are generally used in experimental research feeds. 1.2 Synthetic (1) Hydroxymethyl cellulose: This product is a white fibrous or granular powder, odorless, odorless, hygroscopic, aqueous solution is unstable to heat, and its viscosity decreases with temperature or height. The amount added in the feed should not exceed 2%. (2) Urea-formaldehyde resin: This product has good stability in various harsh environments such as cold, heat, humidity and chemical corrosion, and has other advantages such as low price, and is a good candidate material for pellet feed binder. . The amount is preferably 0.5%. (3) Lignosulfonate: It is an uneven ether polymer, dark brown, and the solid matter is highly hygroscopic, and the content of the granular feed product cannot exceed 4%. (4) In recent years, various research institutes and colleges have been researching and developing feed adhesives that are being promoted and applied. Such as Guangzhou Wilderness Company's high-strength, Ju Lidu and other adhesive products. In addition, there are polyvinyl alcohol (PUA), polyacrylic acid, various starch phosphates, lignin, HJ-1, sodium sulfonate, polymethylurea, sodium caseinate and dextrin, etc. Conjunction. At the same time, depending on whether the binder has a nutritional effect on the farm animals, it can be divided into two types: nutritive and non-nutritive. The former has fish and shrimp powder, plant starch, natural minerals and some synthetic such as N87. Binder, etc. The latter refers to binders that have no nutritional value to animals, such as shrub gum, methyl cellulose, and the like. Wall Mounted Basin Faucet,Brass Basin Tap,Basin Faucet Chrome,Bathroom Basin Mixer kaiping aida sanitary ware technology co.,ltd , https://www.jmkpaidafaucets.com