Application of polypropylene products
DATE：2022/7/18 9:16:03 / READ： / SOURCE：This station
Application of polypropylene products
Polypropylene products, according to their working environment conditions, in order to increase the use time and reduce accidental disasters, appropriate auxiliary materials should be added to the molding resin. UV531; In flammable and explosive working environments, antistatic agents, such as carbon black or alkylamide, should be added to the resin; in order to prevent fire, flame retardants, such as trioxide, should be added to the resin of the molded product Antimony and chlorinated paraffin, etc.
Pay attention to the control of the cooling rate after the molten material is formed: if the cooling rate is too fast, the crystallinity of the product is low, the transparency is good, and internal stress is easily generated; when the product is slowly cooled, the crystallinity is high, and the internal stress is small, but the molding shrinkage rate of the product is small. Larger, the transparency and toughness will also be slightly reduced. Lamination lamination production line www.handern.com
When extruding polypropylene resin, a single-screw extruder or a twin-screw extruder can be used. The length-diameter ratio of the screw is required to be (20~24):1, the compression ratio is (3.5~40):1, and a 100-mesh filter screen is added in front of the barrel; plunger or screw injection molding machines can be used for injection molding. When using a screw injection molding machine, the melt flow rate of the selected raw material can be lower than 0.8g/10min. When forming large and thin-walled products, the MFR value should be larger, and the maximum melt flow rate (MFR) can reach 18g/10min. The injection pressure is 7~14MPa, and the mold temperature is about 50℃. Lamination lamination production line www.handern.com
Pay attention to the influence of colorants on product performance; carbon black has a certain effect on preventing photoaging of products, and phthalocyanine pigments have a certain role in promoting product aging. Lamination lamination production line www.handern.com
Chlorinated polypropylene Chlorinated polypropylene is a resin modified by chlorination of isotactic polypropylene or atactic polypropylene resin. The chlorination reaction formula of polypropylene is: (CHCH+CI2(CHCHCCH CHCH CH3 chlorine in chlorinated polypropylene) The content of chlorine dioxide is related to the chlorination conditions. The stretched film with different chlorine content has excellent strength and various properties. It is used in food packaging and various industrial supplies packaging; , Polycarbonate and Polycarbonate capacitors and occupy most of the PS electric business to prevent the melting of the material market; biaxially oriented film can be used for packaging of various textiles.
Anti-corrosion, anti-pest and microbial erosion, non-toxic and tasteless, no environmental pollution, it has long been the inhibition of large, water, and water.
Sacks are used in large quantities for the packaging of beans, sorghum, corn and various grains and for various construction materials.
package of. Lamination lamination production line www.handern.com
The injection-molded turnover box is light in weight, water-resistant, stable in shape and dimension, and has high rigidity and strength. It is widely used in commodity turnover and sales packaging. Lamination lamination production line www.handern.com
Injection molding of various industrial parts, such as light-duty pinions, bushings, dashboards, bumpers and interior trim parts for wind car parts; in addition, daily necessities boxes, basins, trays and seats, etc.
The produced homopolymer polypropylene pipes (PP-propylene PB and random copolymer polypropylene pipes (PPR pipes) are easy to install in drinking water pipes or other infusion pipes, are resistant to chemical corrosion, meet hygienic requirements, and have a long application time. Lamination lamination production line www.handern.com
Resin generally does not need drying treatment before molding, and its melt fluidity is good and its softening point is high, and the molding cycle is shorter than other types of plastics. Lamination lamination production line www.handern.com
Selection of materials for resin molding products: resins with a melt flow rate (MFR) of 0.15~6g/10min are selected during extrusion molding; resins with a melt flow rate (MFR) of about 10g/10min are selected when extruding blown films; In injection molding, a resin with a melt flow rate (MFR) of 0.3~5g/10min is selected.
The melting point of resin is 160~170℃. The process temperature during extrusion molding is 260~280°C; the process temperature during extrusion blow molding is 220~250°C; the process temperature during injection molding is controlled at 200~300°C. Note that the temperature of the melt cannot exceed 315°C to avoid the decomposition of the melt. In the process of processing and forming products, pay attention to the control of the contact time between the melt and the air, and spinning and other methods for forming and processing, and secondary processing can be carried out if necessary. The formed polypropylene plastic products include: pipes, sheets, films, flat yarns, fibers, various bottles and hollow containers, injection-molded boxes, cups, trays, various industrial accessories and other products.
The molding method of polypropylene resin is shown in Table 2-43
Easy and versatile plastic. The applications of different polypropylene products are as follows. Polypropylene extrusion blown film is a product with simple production equipment, high production efficiency and low price. It is widely used in food packaging, textiles and household sundries packaging. Extrusion casting film is a film with high transparency, good moisture resistance, excellent heat and cold resistance, and easy heat sealing. It is mainly used for the packaging of food, textiles, stationery and other items. Its performance is better than polyethylene Blown film.
It can be combined with other kinds of plastic films, such as paper and aluminum foil, to form a two-layer or more than two-layer composite film. When used for the outer layer, polypropylene has good material strength, dimensional stability, barrier properties, heat and cold resistance, and good printability. It is a kind of eye with good hygiene; it is a thin heel with good gas barrier properties and can replace cellophane. It can be rolled in the middle and can be used to package food in tin cans and glass jars for food packaging. It can be retorted and sterilized at a temperature of 130°C.
Polypropylene products, according to their working environment conditions, in order to increase the use time and reduce accidental disasters, appropriate auxiliary materials should be added to the molding resin. UV531; In flammable and explosive working environments, antistatic agents, such as carbon black or alkylamide, should be added to the resin; in order to prevent fire, flame retardants, such as trioxide, should be added to the resin of the molded product Antimony and chlorinated paraffin, etc.
Pay attention to the control of the cooling rate after the molten material is formed: if the cooling rate is too fast, the crystallinity of the product is low, the transparency is good, and internal stress is easily generated; when the product is slowly cooled, the crystallinity is high, and the internal stress is small, but the molding shrinkage rate of the product is small. Larger, the transparency and toughness will also be slightly reduced. Lamination lamination production line www.handern.com
When extruding polypropylene resin, a single-screw extruder or a twin-screw extruder can be used. The length-diameter ratio of the screw is required to be (20~24):1, the compression ratio is (3.5~40):1, and a 100-mesh filter screen is added in front of the barrel; plunger or screw injection molding machines can be used for injection molding. When using a screw injection molding machine, the melt flow rate of the selected raw material can be lower than 0.8g/10min. When forming large and thin-walled products, the MFR value should be larger, and the maximum melt flow rate (MFR) can reach 18g/10min. The injection pressure is 7~14MPa, and the mold temperature is about 50℃. Lamination lamination production line www.handern.com
Pay attention to the influence of colorants on product performance; carbon black has a certain effect on preventing photoaging of products, and phthalocyanine pigments have a certain role in promoting product aging. Lamination lamination production line www.handern.com
Chlorinated polypropylene Chlorinated polypropylene is a resin modified by chlorination of isotactic polypropylene or atactic polypropylene resin. The chlorination reaction formula of polypropylene is: (CHCH+CI2(CHCHCCH CHCH CH3 chlorine in chlorinated polypropylene) The content of chlorine dioxide is related to the chlorination conditions. The stretched film with different chlorine content has excellent strength and various properties. It is used in food packaging and various industrial supplies packaging; , Polycarbonate and Polycarbonate capacitors and occupy most of the PS electric business to prevent the melting of the material market; biaxially oriented film can be used for packaging of various textiles.
Anti-corrosion, anti-pest and microbial erosion, non-toxic and tasteless, no environmental pollution, it has long been the inhibition of large, water, and water.
Sacks are used in large quantities for the packaging of beans, sorghum, corn and various grains and for various construction materials.
package of. Lamination lamination production line www.handern.com
The injection-molded turnover box is light in weight, water-resistant, stable in shape and dimension, and has high rigidity and strength. It is widely used in commodity turnover and sales packaging. Lamination lamination production line www.handern.com
Injection molding of various industrial parts, such as light-duty pinions, bushings, dashboards, bumpers and interior trim parts for wind car parts; in addition, daily necessities boxes, basins, trays and seats, etc.
The produced homopolymer polypropylene pipes (PP-propylene PB and random copolymer polypropylene pipes (PPR pipes) are easy to install in drinking water pipes or other infusion pipes, are resistant to chemical corrosion, meet hygienic requirements, and have a long application time. Lamination lamination production line www.handern.com
Resin generally does not need drying treatment before molding, and its melt fluidity is good and its softening point is high, and the molding cycle is shorter than other types of plastics. Lamination lamination production line www.handern.com
Selection of materials for resin molding products: resins with a melt flow rate (MFR) of 0.15~6g/10min are selected during extrusion molding; resins with a melt flow rate (MFR) of about 10g/10min are selected when extruding blown films; In injection molding, a resin with a melt flow rate (MFR) of 0.3~5g/10min is selected.
The melting point of resin is 160~170℃. The process temperature during extrusion molding is 260~280°C; the process temperature during extrusion blow molding is 220~250°C; the process temperature during injection molding is controlled at 200~300°C. Note that the temperature of the melt cannot exceed 315°C to avoid the decomposition of the melt. In the process of processing and forming products, pay attention to the control of the contact time between the melt and the air, and spinning and other methods for forming and processing, and secondary processing can be carried out if necessary. The formed polypropylene plastic products include: pipes, sheets, films, flat yarns, fibers, various bottles and hollow containers, injection-molded boxes, cups, trays, various industrial accessories and other products.
The molding method of polypropylene resin is shown in Table 2-43
Easy and versatile plastic. The applications of different polypropylene products are as follows. Polypropylene extrusion blown film is a product with simple production equipment, high production efficiency and low price. It is widely used in food packaging, textiles and household sundries packaging. Extrusion casting film is a film with high transparency, good moisture resistance, excellent heat and cold resistance, and easy heat sealing. It is mainly used for the packaging of food, textiles, stationery and other items. Its performance is better than polyethylene Blown film.
It can be combined with other kinds of plastic films, such as paper and aluminum foil, to form a two-layer or more than two-layer composite film. When used for the outer layer, polypropylene has good material strength, dimensional stability, barrier properties, heat and cold resistance, and good printability. It is a kind of eye with good hygiene; it is a thin heel with good gas barrier properties and can replace cellophane. It can be rolled in the middle and can be used to package food in tin cans and glass jars for food packaging. It can be retorted and sterilized at a temperature of 130°C.
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