Plasticizer-free food grade hose|Polyurethane food grade hose water resistance analysis

by:Haikuo     2021-06-20
Food grade hoses without plasticizers and food silicone hoses have better oil resistance, but water resistance varies with the structure. The reversibility of ester formation reaction causes the most serious degradation of TPU. When the ester is in contact with water, the reformation of the acid is the cause of the autocatalytic reaction that causes the disintegration of the molecule. The degree of disintegration of polyester-based food-grade hoses in air and moisture contact is greater than when they are completely immersed in water. This is because immersed in water, the acid formed will be constantly washed away. The hydrolysis resistance of polyether-based food-grade hoses is 3 to 5 times that of polyester-based food-grade hoses, because the ether group does not react with water.
  The intrusion of water leads to the degradation of the performance of food-grade hoses. There are two reasons: one is that the invading water forms hydrogen bonds with the polar groups in the food-grade hoses, which weakens the hydrogen bonds between polymer molecules. , This process is reversible, and the physical properties are restored after drying. The second is that the intruding water is hydrolyzed using a food-grade hose, which is irreversible.
   Plasticizer-free food grade hose will change color and darken under long-term sunlight, and its physical properties will gradually decrease. Enzyme bacteria can also cause the degradation of food-grade hoses. Therefore, food-grade hoses used in industrial production are added with antioxidants, ultraviolet absorbers, enzyme inhibitors, etc., which are divided into two types: polyester type and polyether type. In comparison of physical properties, low-hardness rubber has better performance with polyester type, while high-hardness food-grade hose is better with polyether type. The polyester-type food-grade conveying hose has good oil resistance, heat resistance and metal adhesion, while the polyether type is better for hydrolysis, cold resistance and antibacterial properties.
   Food grade polyurethane hose has the properties of tensile resistance, strong tension, high tear strength, abrasion resistance, bending resistance, penetration resistance, low temperature resistance, hydrolysis resistance, etc., non-toxic and tasteless, and food materials are not It can decompose any odors, the inside of the tube wall is smooth, the fluidity is superior, the tube wall is highly transparent, the flow of the medium in the tube can be observed, it has strong wear resistance, good pressure resistance, and can discharge static electricity through the grounding of the spiral steel wire;
   has passed SGS testing center FDA and national 18 plasticizer testing, which can be widely used in food, wine, beverage and sanitation industries. It is the best pipe for conveying food, beverage, milk, jam, high-concentration alcohol and other media.
  Temperature range: -35—90°C, can reach 120° in a short time (3 hours)
   Uses: high-flowing solids, such as grains, particles and chips; gaseous and liquid media; industrial sewage, oil transportation; food and pharmaceutical industries; food and beverage transportation, such as liquor, beer, red wine, rice wine, and beverages , Drinking water, juice, jam, etc.;
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