Super white pvc hard tube
DATE：2019/11/27 9:12:06 / READ： / SOURCE：This station
Super white pvc hard tube
1. Material selection and formula design
(1) The selection of raw materials is well known. In addition to the selection of appropriate grades of PNC resin in PVC product processing formulas, there must be thermal stabilizers, processing aids, lubricants, and impact modifiers. According to the processing and use requirements of different products, Also need to add plasticizers, antioxidants, antistatic agents and pigments.
1) PVC resin. Because this product has very high whiteness requirements, the thermal stability of the resin itself is critical. Therefore, a resin with a K value of about 65 should be selected. Through a control experiment,
S-65 (Formosa Plastic), TK-1001 (Japan), L-1000 (Tianjin Lejin) have better effects and can meet the requirements. Due to the strict color requirements of this product, resins from different manufacturers must be trial-produced before mass production, otherwise the colors do not match.
2) Thermal stabilizer. Although this product is exported to European and American markets, there is no special requirement for heat stabilizers, so lead-based stabilizers are selected as heat stabilizers for production. The selection of heat stabilizer is a very critical step in production, and a series of experiments have been done for this purpose. Basic formula (mass parts): 100 parts PC, 0.4 parts external lubricant, 0.8 parts internal lubricant. The formula was extruded on a SJSZ45 twin-screw extruder. By comparing various thermal stabilizers, P-210D (domestic) and 2.0 parts of trisalt + 2.0 parts of lead stearate were selected.
3) Lubricant. Lubricants are actually stabilizers, which are characterized by reducing the damage of mechanical stress during the processing of polyvinyl chloride, which can be achieved by adjusting the flow properties of the components, thereby reducing internal friction and the heat emitted during mechanical operation. Because the processing temperature is reduced, the forming process of the polyvinyl chloride material or its products can be performed uniformly and quickly, especially when the components are in contact with the metal, because the components are prevented from adhering to the metal surface of the processing equipment, the Degradation is reduced. In addition, it can make the various ingredients added to the components easier to distribute and improve the appearance of the product. Due to the importance of the lubricant to the product, careful selection of internal and external lubricants is required. Polyethylene wax is used as the external lubricant, which has stable chemical properties and excellent electrical properties. Butyl stearate is used as the internal lubricant. However, it is only excellent in the initial lubrication effect, and the continuous slip is poor in the middle period. Stearic acid has good lubricity in the middle and late stages). 4) Pigments. PNC resin is yellow after plasticizing and molding, in order to achieve extra white, you need to add
1. Material selection and formula design
(1) The selection of raw materials is well known. In addition to the selection of appropriate grades of PNC resin in PVC product processing formulas, there must be thermal stabilizers, processing aids, lubricants, and impact modifiers. According to the processing and use requirements of different products, Also need to add plasticizers, antioxidants, antistatic agents and pigments.
1) PVC resin. Because this product has very high whiteness requirements, the thermal stability of the resin itself is critical. Therefore, a resin with a K value of about 65 should be selected. Through a control experiment,
S-65 (Formosa Plastic), TK-1001 (Japan), L-1000 (Tianjin Lejin) have better effects and can meet the requirements. Due to the strict color requirements of this product, resins from different manufacturers must be trial-produced before mass production, otherwise the colors do not match.
2) Thermal stabilizer. Although this product is exported to European and American markets, there is no special requirement for heat stabilizers, so lead-based stabilizers are selected as heat stabilizers for production. The selection of heat stabilizer is a very critical step in production, and a series of experiments have been done for this purpose. Basic formula (mass parts): 100 parts PC, 0.4 parts external lubricant, 0.8 parts internal lubricant. The formula was extruded on a SJSZ45 twin-screw extruder. By comparing various thermal stabilizers, P-210D (domestic) and 2.0 parts of trisalt + 2.0 parts of lead stearate were selected.
3) Lubricant. Lubricants are actually stabilizers, which are characterized by reducing the damage of mechanical stress during the processing of polyvinyl chloride, which can be achieved by adjusting the flow properties of the components, thereby reducing internal friction and the heat emitted during mechanical operation. Because the processing temperature is reduced, the forming process of the polyvinyl chloride material or its products can be performed uniformly and quickly, especially when the components are in contact with the metal, because the components are prevented from adhering to the metal surface of the processing equipment, the Degradation is reduced. In addition, it can make the various ingredients added to the components easier to distribute and improve the appearance of the product. Due to the importance of the lubricant to the product, careful selection of internal and external lubricants is required. Polyethylene wax is used as the external lubricant, which has stable chemical properties and excellent electrical properties. Butyl stearate is used as the internal lubricant. However, it is only excellent in the initial lubrication effect, and the continuous slip is poor in the middle period. Stearic acid has good lubricity in the middle and late stages). 4) Pigments. PNC resin is yellow after plasticizing and molding, in order to achieve extra white, you need to add
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