Food-grade rust-proof biaxially-oriented polypropylene film and preparation method thereof

Abstract

The invention relates to a food-grade rust-proof biaxially-oriented polypropylene film. The food-grade rust-proof biaxially-oriented polypropylene film comprises a substrate and a coating layer on thesubstrate surface, wherein a primer layer is arranged between the coating layer and the substrate; the coating layer is a modified polypropylene coating formed by applying modified barrier polypropylene latex to the surface of the primer layer and drying the latex; the ultrahigh vapor-barrier polypropylene latex is prepared from raw materials in parts by weight as follows: 52-95 parts of deionized water, 0.9-1.9 parts of sodium percarbonate, 0.5-2.3 parts of vinyl chloride, 37-40.9 parts of polypropylene, 2.9-3.9 parts of polyvinyl alcohol, 6-8 parts of propionamide and 1-2 parts of polytetrafluoroethylene propyl ester. The traditional food-grade rust-proof biaxially-oriented polypropylene film is modified, so that the food-grade rust-proof biaxially-oriented polypropylene film is endowedwith ultrahigh vapor barrier performance while keeping original characteristics.

Description

technical field

[0001] The invention relates to the technical field of food packaging materials, in particular to a food-grade antirust polypropylene biaxially stretched film and a preparation method thereof. Background technique

[0002] Food-grade antirust polypropylene biaxially oriented film is a metal protective packaging material that has developed rapidly in recent years. It is a new generation of innovative high-tech products based on the combination of polymer materials and VCI vapor phase antirust technology. After the anti-rust article is packaged and sealed with this film, the VCI contained in the film begins to sublimate and volatilize the anti-rust gas factor, which diffuses and penetrates to the surface of the anti-rust article and adsorbs on it, forming a dense protective film layer with a thickness of one molecule, which insulates Various factors that induce corrosion are in contact with the surface of the anti-rust object, thereby effectively preventing the...

Examples

Embodiment 1

[0019] Pass 90 kg of deionized water into a 200L reactor, add 1 kg of sodium percarbonate, stir at 80 rpm, and control the temperature at 36°C. Use a constant flow pump to add 1 kg of vinyl chloride and 38 kg of polypropylene to the reactor at a constant speed at a rate of 240 g / min. During the feeding process, the temperature of the reactor is 80° C., and the stirring speed is 80 rpm. Raise the temperature of the reactor, control it at 89°C, add 3 kg of polyvinyl alcohol to the reactor at a constant speed using a constant flow pump, and keep the temperature constant for 49 minutes after the addition. The temperature was lowered to 70°C, and 9 kg of propionamide was added dropwise to the reactor at a rate of 240 g / min. After one hour, the temperature was lowered to 99°C, and polytetrafluoroethylene propyl ester was added at a constant speed using a constant flow pump. Keep the temperature constant for 1 hour and stir at 80 rpm to prepare a coating liquid with water vapor barr...

Embodiment 2

[0021] Pass 52 kg of deionized water into a 200L reactor, add 0.9 kg of sodium percarbonate, stir at 80 rpm, and control the temperature at 37°C. Use a constant flow pump to add 0.9 kg of vinyl chloride and 37 kg of polypropylene to the reactor at a constant speed at a rate of 200 g / min. During the feeding process, the temperature of the reactor is 90° C., and the stirring speed is 80 rpm. Raise the temperature of the reactor and control it at 88°C, add 3.9 kg of polyvinyl alcohol to the reactor at a constant speed using a constant flow pump, and keep the temperature constant for 30 minutes after the addition. The temperature was lowered to 70°C, and 6 kg of propionamide was added dropwise to the reactor at a rate of 70 g / min. After one hour, the temperature was lowered to 90°C, and polytetrafluoroethylene propyl ester was added at a constant speed using a constant flow pump. Keep the temperature constant for 1 hour and stir at 80 rpm to prepare a coating liquid with water va...

Embodiment 3

[0023] Pass 95 kg of deionized water into a 200L reactor, add 1.9 kg of sodium percarbonate, stir at 240 rpm, and control the temperature at 40°C. Use a constant flow pump to add 1.9 kg of vinyl chloride and 39 kg of polypropylene to the reactor at a constant speed at a rate of 300 g / min. During the feeding process, the temperature of the reactor is 80° C., and the stirring speed is 240 rpm. Raise the temperature of the reactor, control it at 90°C, add 2.9 kg of polyvinyl alcohol to the reactor at a constant speed using a constant flow pump, and keep the temperature constant for 49 minutes after the addition. The temperature was lowered to 69°C, and 6.9 kg of propionamide was added dropwise to the reactor at a rate of 80 g / min. After one hour, the temperature was lowered to 99°C, and polytetrafluoroethylene propyl ester was added at a constant speed using a constant flow pump. Constant temperature for 1 hour, stirring speed at 90 rpm, that is, a coating liquid with water vapo...

technical field

[0001] The invention relates to the technical field of food packaging materials, in particular to a food-grade antirust polypropylene biaxially stretched film and a preparation method thereof. Background technique

[0002] Food-grade antirust polypropylene biaxially oriented film is a metal protective packaging material that has developed rapidly in recent years. It is a new generation of innovative high-tech products based on the combination of polymer materials and VCI vapor phase antirust technology. After the anti-rust article is packaged and sealed with this film, the VCI contained in the film begins to sublimate and volatilize the anti-rust gas factor, which diffuses and penetrates to the surface of the anti-rust article and adsorbs on it, forming a dense protective film layer with a thickness of one molecule, which insulates Various factors that induce corrosion are in contact with the surface of the anti-rust object, thereby effectively preventing the...

Examples

Embodiment 1

[0019] Pass 90 kg of deionized water into a 200L reactor, add 1 kg of sodium percarbonate, stir at 80 rpm, and control the temperature at 36°C. Use a constant flow pump to add 1 kg of vinyl chloride and 38 kg of polypropylene to the reactor at a constant speed at a rate of 240 g / min. During the feeding process, the temperature of the reactor is 80° C., and the stirring speed is 80 rpm. Raise the temperature of the reactor, control it at 89°C, add 3 kg of polyvinyl alcohol to the reactor at a constant speed using a constant flow pump, and keep the temperature constant for 49 minutes after the addition. The temperature was lowered to 70°C, and 9 kg of propionamide was added dropwise to the reactor at a rate of 240 g / min. After one hour, the temperature was lowered to 99°C, and polytetrafluoroethylene propyl ester was added at a constant speed using a constant flow pump. Keep the temperature constant for 1 hour and stir at 80 rpm to prepare a coating liquid with water vapor barr...

Embodiment 2

[0021] Pass 52 kg of deionized water into a 200L reactor, add 0.9 kg of sodium percarbonate, stir at 80 rpm, and control the temperature at 37°C. Use a constant flow pump to add 0.9 kg of vinyl chloride and 37 kg of polypropylene to the reactor at a constant speed at a rate of 200 g / min. During the feeding process, the temperature of the reactor is 90° C., and the stirring speed is 80 rpm. Raise the temperature of the reactor and control it at 88°C, add 3.9 kg of polyvinyl alcohol to the reactor at a constant speed using a constant flow pump, and keep the temperature constant for 30 minutes after the addition. The temperature was lowered to 70°C, and 6 kg of propionamide was added dropwise to the reactor at a rate of 70 g / min. After one hour, the temperature was lowered to 90°C, and polytetrafluoroethylene propyl ester was added at a constant speed using a constant flow pump. Keep the temperature constant for 1 hour and stir at 80 rpm to prepare a coating liquid with water va...

Embodiment 3

[0023] Pass 95 kg of deionized water into a 200L reactor, add 1.9 kg of sodium percarbonate, stir at 240 rpm, and control the temperature at 40°C. Use a constant flow pump to add 1.9 kg of vinyl chloride and 39 kg of polypropylene to the reactor at a constant speed at a rate of 300 g / min. During the feeding process, the temperature of the reactor is 80° C., and the stirring speed is 240 rpm. Raise the temperature of the reactor, control it at 90°C, add 2.9 kg of polyvinyl alcohol to the reactor at a constant speed using a constant flow pump, and keep the temperature constant for 49 minutes after the addition. The temperature was lowered to 69°C, and 6.9 kg of propionamide was added dropwise to the reactor at a rate of 80 g / min. After one hour, the temperature was lowered to 99°C, and polytetrafluoroethylene propyl ester was added at a constant speed using a constant flow pump. Constant temperature for 1 hour, stirring speed at 90 rpm, that is, a coating liquid with water vapo...