High-temperature cooking packaging bag

Abstract

The invention relates to the field of food packaging materials, in particular to a high-temperature cooking packaging bag which is used for solving the problems that a traditional food packaging bag is damaged, deformed and adhered to food in the high-temperature cooking process and is difficult to degrade after being used and discarded. According to the high-temperature cooking packaging bag, the polypropylene and the temperature-resistant hydrophobic polyester are used as main raw materials, the polypropylene is not prone to breakage at the high temperature due to the high melting point, the high-temperature-resistant hydrophobic polyester can resist the high temperature and is not molten in the cooking process, and the temperature-resistant hydrophobic polyester has good environmental friendliness, heat resistance and hydrophobicity; under the synergistic effect of the polypropylene and the temperature-resistant hydrophobic polyester, the prepared high-temperature cooking packaging bag can keep the integrity and sealing performance of the packaging bag during high-temperature cooking, moisture permeation can be effectively prevented, food is protected against moisture erosion, the shelf life is prolonged, food adhesion is not likely to be caused, and the attractive appearance of the food is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of food packaging materials, and particularly to a high-temperature cooking and steaming packaging bag. Background Art

[0002] With the improvement of people's requirements for food safety and hygiene, food packaging technology has received increasing attention. The high-temperature cooking and steaming packaging bag is a new type of food packaging technology, mainly used for sterilizing and processing food in high-temperature and high-pressure environments. Its core idea is to combine high temperature and steam, which can not only effectively kill bacteria but also maintain the aroma and taste of food. This packaging method is particularly suitable for scenarios with high requirements for food quality and hygiene. Compared with traditional cooking and steaming packaging, the high-temperature cooking and steaming packaging bag can kill potential harmful microorganisms more quickly, thus extending the shelf life of food.

[0003] However, traditional food packaging bags often have problems such as breakage, deformation, and food adhesion during high-temperature cooking and steaming, and are difficult to degrade after use and discard, unable to meet the high requirements of the modern food industry for packaging bags with high temperature resistance and water repellency. Therefore, it is of great significance to develop a high-temperature cooking and steaming packaging bag. Summary of the Invention

[0004] In order to overcome the above technical problems, the purpose of the present invention is to provide a high-temperature cooking and steaming packaging bag, which solves the problems of breakage, deformation, and food adhesion of traditional food packaging bags during high-temperature cooking and steaming, and is difficult to degrade after use and discard.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A high-temperature cooking and steaming packaging bag, comprising the following components in parts by weight:

[0007] 80 - 90 parts of polypropylene, 13 - 29 parts of temperature-resistant and hydrophobic polyester, 4.3 - 7.3 parts of compatibilizer, 1 - 5 parts of nano-silica, 1 - 5 parts of talcum powder, and 0.3 - 0.7 parts of zinc stearate;

[0008] Among them, the temperature-resistant and hydrophobic polyester is prepared by the following steps:

[0009] Step A1: Octamethylcyclotetrasiloxane, diphenyldimethoxysilane, 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, tetramethyldisiloxane and concentrated sulfuric acid are added into a three-necked flask equipped with a stirrer, a thermometer and a gas pipe. Nitrogen protection is introduced. The mixture is stirred and reacted for 20 - 30 min under the conditions of a temperature of 0 - 5°C and a stirring rate of 300 - 400 r / min. Then, it is heated to 50 - 60°C and continuously stirred and reacted for 5 - 6 h. After the reaction is completed, the reaction product is cooled to room temperature, then adjusted to pH 7 - 7.5 with sodium hydroxide solution, and then vacuum filtered. The filtrate is rotary evaporated to remove low-boiling substances, and a fluorine-containing phenyl silicone oil with terminal hydrogen is obtained.

[0010] Step A2: The fluorine-containing phenyl silicone oil with terminal hydrogen, allyl alcohol and isopropyl alcohol are added into a three-necked flask equipped with a stirrer, a thermometer and a gas pipe. Nitrogen protection is introduced. The mixture is stirred and reacted for 20 - 30 min under the conditions of a temperature of 10 - 15°C and a stirring rate of 300 - 400 r / min. Then, a chloroplatinic acid-isopropyl alcohol solution is added and the temperature is raised to 75 - 85°C and continuously stirred and reacted for 4 - 5 h. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation to obtain a fluorine-containing phenyl silicone oil with terminal hydroxyl groups.

[0011] Step A3: Succinic acid, ethylene glycol, the fluorine-containing phenyl silicone oil with terminal hydroxyl groups and tetra-isopropyl titanate are added into a three-necked flask equipped with a stirrer, a thermometer and a gas pipe. Nitrogen protection is introduced. The mixture is stirred and reacted for 5 - 10 min under the conditions of a temperature of 20 - 25°C and a stirring rate of 300 - 400 r / min. Then, it is heated to 190 - 200°C and continuously stirred and reacted for 5 - 6 h. Then, it is heated to 230 - 240°C and the pressure is reduced to 20 - 25 Pa and continuously stirred and reacted until the rod climbing phenomenon appears. After the reaction is completed, the reaction product is cooled to room temperature to obtain a temperature-resistant hydrophobic polyester.

[0012] As a further scheme of the present invention: The polypropylene is L5D98 polypropylene.

[0013] As a further scheme of the present invention: The compatibilizer is PP-g-MAH.

[0014] As a further scheme of the present invention: The dosage ratio of the octamethylcyclotetrasiloxane, diphenyldimethoxysilane, 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, tetramethyldisiloxane and concentrated sulfuric acid in Step A1 is 25 - 30 g: 10 - 16 g: 2.5 - 4.5 g: 5 - 7 g: 0.9 - 1.5 g.

[0015] As a further scheme of the present invention: The mass fraction of the concentrated sulfuric acid in Step A1 is 96 - 98%.

[0016] As a further solution of the present invention: the mass fraction of the sodium hydroxide solution in step A1 is 18-22%.

[0017] As a further solution of the present invention: the dosage ratio of the terminal hydrogen-containing fluorophenyl silicone oil, allyl alcohol, isopropanol, and chloroplatinic acid-isopropanol solution in step A2 is 30-35 g: 2.5-4.5 g: 10-12 mL: 10-15 mL.

[0018] As a further solution of the present invention: the chloroplatinic acid-isopropanol solution in step A2 is a solution formed by dissolving chloroplatinic acid in isopropanol according to 0.05-0.09 g: 10-12 mL.

[0019] As a further solution of the present invention: the dosage ratio of succinic acid, ethylene glycol, terminal hydroxyl group-containing fluorophenyl silicone oil, and tetra-isopropyl titanate in step A3 is 30 g: 8-12 g: 5-25 g: 0.3-0.5 g.

[0020] As a further solution of the present invention: the preparation method of the high-temperature cooking packaging bag includes the following steps:

[0021] Step 1: Weigh 80-90 parts of polypropylene, 13-29 parts of temperature-resistant hydrophobic polyester, 4.3-7.3 parts of compatibilizer, 1-5 parts of nano-silica, 1-5 parts of talcum powder, and 0.3-0.7 parts of zinc stearate by weight, and set aside;

[0022] Step 2: Add polypropylene, temperature-resistant hydrophobic polyester, compatibilizer, nano-silica, talcum powder, and zinc stearate to a mixer and stir and mix them. After mixing evenly, a mixed material is obtained;

[0023] Step 3: Add the mixed material to a twin-screw extruder, and under the conditions of a temperature of 185-195 °C and a screw speed of 50-100 r / min, melt and blend and then extrude, and then pelletize to obtain mixed pellets;

[0024] Step 4: Blow the mixed pellets through a blown film machine to produce a film with a thickness of 30-50 μm, and slit and bag the film to obtain a high-temperature cooking packaging bag.

[0025] The beneficial effects of the present invention:

[0026] A high-temperature cooking packaging bag of the present invention is prepared by adding polypropylene, heat-resistant hydrophobic polyester, compatibilizer, nano-silica, talcum powder, and zinc stearate into a mixer for stirring and mixing. After uniform mixing, a mixed material is obtained. The mixed material is added into a twin-screw extruder for melt blending and then extruded, and then pelletized to obtain mixed pellets. The mixed pellets are blown into a film by a blown film machine to obtain a film, and the film is slit and made into a bag to obtain a high-temperature cooking packaging bag. The high-temperature cooking packaging bag uses polypropylene and heat-resistant hydrophobic polyester as the main raw materials. Polypropylene has a relatively high melting point, making it not easily break at high temperatures and capable of resisting high temperatures during cooking without melting. The heat-resistant hydrophobic polyester has good environmental protection, heat resistance, and hydrophobicity. Under the synergistic effect of polypropylene and heat-resistant hydrophobic polyester, the prepared high-temperature cooking packaging bag can maintain the integrity and sealing performance of the packaging bag during high-temperature cooking, effectively prevent moisture penetration, protect food from moisture erosion, extend the shelf life, and is not easily caused by food adhesion, ensuring the aesthetic appearance of food. Moreover, the preparation method of the high-temperature cooking packaging bag is simple and efficient, suitable for large-scale industrial production.

[0027] In the process of preparing the high-temperature cooking packaging bag, a heat-resistant hydrophobic polyester was first prepared. First, octamethylcyclotetrasiloxane, diphenyldimethoxysilane, 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, and tetramethyldisiloxane were used as polymerization monomers for polymerization to form an organosilicon containing phenyl and C-F bonds and hydrogen-terminated, obtaining a hydrogen-terminated fluorinated phenyl silicone oil. Then, the hydrogen-terminated fluorinated phenyl silicone oil was reacted with allyl alcohol, and the Si-H on the hydrogen-terminated fluorinated phenyl silicone oil and the alkenyl group on allyl alcohol underwent a hydrosilylation reaction to form a hydroxyl-terminated organosilicon, obtaining a hydroxyl-terminated fluorinated phenyl silicone oil. Then, succinic acid, ethylene glycol, and the hydroxyl-terminated fluorinated phenyl silicone oil were used as polymerization monomers for copolymerization to form a copolyester, obtaining the heat-resistant hydrophobic polyester. The molecular chain of the heat-resistant hydrophobic polyester contains a large number of aromatic ring structures, Si-O bonds, and C-F bonds, endowing it with excellent heat resistance and hydrophobicity, and containing a large number of ester groups, making it have good biodegradability and good environmental protection. Specific embodiments

[0028] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0029] Example 1:

[0030] This example is a preparation method of a high-temperature cooking packaging bag, including the following steps:

[0031] Step S1: Add 25 g of octamethylcyclotetrasiloxane, 10 g of diphenyldimethoxysilane, 2.5 g of 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, 5 g of tetramethyldisiloxane, and 0.9 g of concentrated sulfuric acid with a mass fraction of 96% into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection, and stir and react for 20 min under the conditions of a temperature of 0 °C and a stirring rate of 300 r / min. Then, continue to stir and react for 5 h under the condition of raising the temperature to 50 °C. After the reaction is completed, cool the reaction product to room temperature, then adjust the pH to 7 with a sodium hydroxide solution with a mass fraction of 18%, and then perform vacuum filtration. Rotate and evaporate the filtrate to remove low-boiling substances to obtain fluorine-containing phenyl silicone oil with terminal hydrogen;

[0032] Step S2: Add 30 g of fluorine-containing phenyl silicone oil with terminal hydrogen, 2.5 g of allyl alcohol, and 10 mL of isopropyl alcohol into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection, and stir and react for 20 min under the conditions of a temperature of 10 °C and a stirring rate of 300 r / min. Then, add 10 mL of a chloroplatinic acid-isopropyl alcohol solution formed by dissolving 0.05 g of chloroplatinic acid in 10 mL of isopropyl alcohol and raise the temperature to 75 °C and continue to stir and react for 4 h. After the reaction is completed, cool the reaction product to room temperature, and then rotate and evaporate to remove the solvent to obtain fluorine-containing phenyl silicone oil with terminal hydroxyl;

[0033] Step S3: Add 30 g of succinic acid, 8 g of ethylene glycol, 5 g of fluorine-containing phenyl silicone oil with terminal hydroxyl, and 0.3 g of tetra-isopropyl titanate into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection, and stir and react for 5 min under the conditions of a temperature of 20 °C and a stirring rate of 300 r / min. Then, continue to stir and react for 5 h under the condition of raising the temperature to 190 °C. Then, raise the temperature to 230 °C and reduce the pressure to 20 Pa and continue to stir and react until the climbing rod phenomenon appears. After the reaction is completed, cool the reaction product to room temperature to obtain a temperature-resistant hydrophobic polyester;

[0034] Step S4: Weigh 80 parts of polypropylene, 13 parts of temperature-resistant hydrophobic polyester, 4.3 parts of compatibilizer, 1 part of nano-silica, 1 part of talc powder, and 0.3 part of zinc stearate by weight, and set aside;

[0035] Step S5: Add polypropylene, temperature-resistant hydrophobic polyester, compatibilizer, nano-silica, talc powder, and zinc stearate into a mixer and stir and mix. After mixing evenly, obtain a mixed material;

[0036] Step S6: Add the mixed material into a twin-screw extruder, and perform melt blending and extrusion under the conditions of a temperature of 185 °C and a screw speed of 50 r / min, and then granulate to obtain mixed pellets;

[0037] Step S7: Blow the mixed pellets through a blown film machine to produce a film with a thickness of 40 μm, and then slit and bag the film to obtain a high-temperature cooking packaging bag.

[0038] Example 2:

[0039] This example is a preparation method of a high-temperature cooking packaging bag, including the following steps:

[0040] Step S1: Add 28 g of octamethylcyclotetrasiloxane, 13 g of diphenyldimethoxysilane, 3.5 g of 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, 6 g of tetramethyldisiloxane, and 1.2 g of concentrated sulfuric acid with a mass fraction of 97% into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection, and stir and react at a temperature of 3 °C and a stirring rate of 350 r / min for 25 min. Then, continue to stir and react at a temperature of 55 °C for 5.5 h. After the reaction is completed, cool the reaction product to room temperature, then adjust the pH to 7.2 with a 20% sodium hydroxide solution, and then perform vacuum filtration. Rotate and evaporate the filtrate to remove low-boiling substances to obtain fluorophenyl silicone oil with terminal hydrogen.

[0041] Step S2: Add 32 g of fluorophenyl silicone oil with terminal hydrogen, 3.5 g of allyl alcohol, and 11 mL of isopropyl alcohol into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection, and stir and react at a temperature of 12 °C and a stirring rate of 350 r / min for 25 min. Then, add 12 mL of a chloroplatinic acid-isopropyl alcohol solution formed by dissolving 0.07 g of chloroplatinic acid in 11 mL of isopropyl alcohol and continue to stir and react at a temperature of 80 °C for 4.5 h. After the reaction is completed, cool the reaction product to room temperature, and then rotate and evaporate to remove the solvent to obtain fluorophenyl silicone oil with terminal hydroxyl groups.

[0042] Step S3: Add 30 g of succinic acid, 10 g of ethylene glycol, 15 g of fluorophenyl silicone oil with terminal hydroxyl groups, and 0.4 g of tetra-isopropyl titanate into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection, and stir and react at a temperature of 22 °C and a stirring rate of 350 r / min for 8 min. Then, continue to stir and react at a temperature of 195 °C for 5.5 h. Then, raise the temperature to 235 °C and reduce the pressure to 22 Pa and continue to stir and react until the rod climbing phenomenon appears. After the reaction is completed, cool the reaction product to room temperature to obtain a temperature-resistant hydrophobic polyester.

[0043] Step S4: Weigh 85 parts of polypropylene, 21 parts of temperature-resistant hydrophobic polyester, 5.8 parts of compatibilizer, 3 parts of nano-silica, 3 parts of talc powder, and 0.5 part of zinc stearate by weight, and set aside;

[0044] Step S5: Add polypropylene, temperature-resistant hydrophobic polyester, compatibilizer, nano-silica, talcum powder, and zinc stearate into a mixer and stir to mix evenly to obtain a mixed material.

[0045] Step S6: Add the mixed material into a twin-screw extruder, melt and blend it under the conditions of a temperature of 190°C and a screw rotation speed of 75 r / min, and then extrude and pelletize to obtain mixed pellets.

[0046] Step S7: Blow the mixed pellets through a blown film machine to produce a film with a thickness of 40 μm, and then slit and bag the film to obtain a high-temperature cooking packaging bag.

[0047] Example 3:

[0048] This example is a preparation method of a high-temperature cooking packaging bag, which includes the following steps:

[0049] Step S1: Add 30 g of octamethylcyclotetrasiloxane, 16 g of diphenyldimethoxysilane, 4.5 g of 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, 7 g of tetramethyldisiloxane, and 1.5 g of concentrated sulfuric acid with a mass fraction of 98% into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen protection, stir and react for 30 min under the conditions of a temperature of 5°C and a stirring rate of 400 r / min, then continue to stir and react for 6 h under the condition of heating to 60°C. After the reaction is completed, cool the reaction product to room temperature, then adjust the pH to 7.5 with a sodium hydroxide solution with a mass fraction of 22%, and then perform vacuum filtration. Rotate and evaporate the filtrate to remove low-boiling substances to obtain fluorophenyl silicone oil with terminal hydrogen.

[0050] Step S2: Add 35 g of fluorophenyl silicone oil with terminal hydrogen, 4.5 g of allyl alcohol, and 12 mL of isopropyl alcohol into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen protection, stir and react for 30 min under the conditions of a temperature of 15°C and a stirring rate of 400 r / min, then add 15 mL of chloroplatinic acid-isopropyl alcohol solution formed by dissolving 0.09 g of chloroplatinic acid in 12 mL of isopropyl alcohol and heat to 85°C to continue stirring and reacting for 5 h. After the reaction is completed, cool the reaction product to room temperature, and then rotate and evaporate to remove the solvent to obtain fluorophenyl silicone oil with terminal hydroxyl.

[0051] Step S3: Add 30 g of succinic acid, 12 g of ethylene glycol, 25 g of fluorophenyl group-containing silicone oil with terminal hydroxyl groups, and 0.5 g of tetra-isopropyl titanate into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection. Stir and react for 10 min under the conditions of a temperature of 25°C and a stirring rate of 400 r / min. Then, raise the temperature to 200°C and continue to stir and react for 6 h. After that, raise the temperature to 240°C and reduce the pressure to 25 Pa, and continue to stir and react until the climbing rod phenomenon appears. After the reaction ends, cool the reaction product to room temperature to obtain a temperature-resistant and hydrophobic polyester;

[0052] Step S4: Weigh 90 parts of polypropylene, 29 parts of temperature-resistant and hydrophobic polyester, 7.3 parts of compatibilizer, 5 parts of nano-silica, 5 parts of talcum powder, and 0.7 part of zinc stearate by weight, and set aside;

[0053] Step S5: Add polypropylene, temperature-resistant and hydrophobic polyester, compatibilizer, nano-silica, talcum powder, and zinc stearate into a mixer and stir and mix them. After mixing evenly, a mixed material is obtained;

[0054] Step S6: Add the mixed material into a twin-screw extruder, melt and blend it under the conditions of a temperature of 195°C and a screw rotation speed of 100 r / min, and then extrude it and pelletize it to obtain mixed pellets;

[0055] Step S7: Blow the mixed pellets through a blown film machine to produce a film with a thickness of 40 μm, and slit and bag the film to obtain a high-temperature cooking packaging bag.

[0056] Comparative Example 1:

[0057] This comparative example is a preparation method of a high-temperature cooking packaging bag, including the following steps:

[0058] Step S1: Weigh 90 parts of polypropylene, 7.3 parts of compatibilizer, 5 parts of nano-silica, 5 parts of talcum powder, and 0.7 part of zinc stearate by weight, and set aside;

[0059] Step S2: Add polypropylene, compatibilizer, nano-silica, talcum powder, and zinc stearate into a mixer and stir and mix them. After mixing evenly, a mixed material is obtained;

[0060] Step S3: Add the mixed material into a twin-screw extruder, melt and blend it under the conditions of a temperature of 195°C and a screw rotation speed of 100 r / min, and then extrude it and pelletize it to obtain mixed pellets;

[0061] Step S4: Blow the mixed pellets through a blown film machine to produce a film with a thickness of 40 μm, and slit and bag the film to obtain a high-temperature cooking packaging bag.

[0062] Comparative Example 2:

[0063] This comparative example is a preparation method of a high-temperature cooking packaging bag, including the following steps:

[0064] Step S1: Add 30 g of succinic acid, 12 g of ethylene glycol, and 0.5 g of tetraisopropyl titanate into a three-necked flask equipped with a stirrer, a thermometer, and a gas guide tube, introduce nitrogen for protection, stir and react at a temperature of 25 °C and a stirring rate of 400 r / min for 10 min, then raise the temperature to 200 °C and continue to stir and react for 6 h, then raise the temperature to 240 °C and reduce the pressure to 25 Pa and continue to stir and react until the climbing rod phenomenon appears. After the reaction is completed, cool the reaction product to room temperature to obtain polyester;

[0065] Step S2: Weigh 90 parts of polypropylene, 29 parts of polyester, 7.3 parts of compatibilizer, 5 parts of nano-silica, 5 parts of talcum powder, and 0.7 part of zinc stearate by weight, and set aside;

[0066] Step S3: Add polypropylene, polyester, compatibilizer, nano-silica, talcum powder, and zinc stearate into a mixer and stir and mix them. After mixing evenly, obtain a mixed material;

[0067] Step S4: Add the mixed material into a twin-screw extruder, melt and blend it at a temperature of 195 °C and a screw speed of 100 r / min and then extrude it, and then pelletize it to obtain mixed pellets;

[0068] Step S5: Blow the mixed pellets through a blown film machine to produce a film with a thickness of 40 μm, and slit and bag the film to obtain a high-temperature cooking packaging bag.

[0069] Comparative Example 3:

[0070] This comparative example is a preparation method of a high-temperature cooking packaging bag, including the following steps:

[0071] Step S1: Add 30 g of octamethylcyclotetrasiloxane, 7 g of tetramethyldisiloxane, and 1.5 g of concentrated sulfuric acid with a mass fraction of 98% into a three-necked flask equipped with a stirrer, a thermometer, and a gas guide tube, introduce nitrogen for protection, stir and react at a temperature of 5 °C and a stirring rate of 400 r / min for 30 min, then raise the temperature to 60 °C and continue to stir and react for 6 h. After the reaction is completed, cool the reaction product to room temperature, then adjust it to pH 7.5 with a sodium hydroxide solution with a mass fraction of 22%, then perform vacuum filtration, and rotary evaporate the filtrate to remove low-boiling substances to obtain hydrogen-terminated silicone oil;

[0072] Step S2: Add 35 g of terminal hydrogen silicone oil, 4.5 g of allyl alcohol, and 12 mL of isopropanol into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection. Stir and react for 30 min under the conditions of a temperature of 15°C and a stirring rate of 400 r / min. Then add 15 mL of a chloroplatinic acid-isopropanol solution formed by dissolving 0.09 g of chloroplatinic acid in 12 mL of isopropanol and continue to stir and react for 5 h under the condition of heating to 85°C. After the reaction is completed, cool the reaction product to room temperature, and then remove the solvent by rotary evaporation to obtain terminal hydroxyl silicone oil;

[0073] Step S3: Add 30 g of succinic acid, 12 g of ethylene glycol, 25 g of terminal hydroxyl silicone oil, and 0.5 g of tetra-isopropyl titanate into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection. Stir and react for 10 min under the conditions of a temperature of 25°C and a stirring rate of 400 r / min. Then continue to stir and react for 6 h under the condition of heating to 200°C. Then continue to stir and react under the conditions of heating to 240°C and reducing the pressure to 25 Pa until the climbing rod phenomenon appears. After the reaction is completed, cool the reaction product to room temperature to obtain heat-resistant hydrophobic polyester;

[0074] Step S4: Weigh 90 parts of polypropylene, 29 parts of heat-resistant hydrophobic polyester, 7.3 parts of compatibilizer, 5 parts of nano-silica, 5 parts of talcum powder, and 0.7 part of zinc stearate by weight for standby;

[0075] Step S5: Add polypropylene, heat-resistant hydrophobic polyester, compatibilizer, nano-silica, talcum powder, and zinc stearate into a mixer and stir and mix them. After mixing evenly, a mixed material is obtained;

[0076] Step S6: Add the mixed material into a twin-screw extruder, melt and blend it under the conditions of a temperature of 195°C and a screw speed of 100 r / min, and then extrude it and granulate it to obtain mixed pellets;

[0077] Step S7: Blow the mixed pellets through a blown film machine to produce a film with a thickness of 40 μm, and then slit and bag the film to obtain a high-temperature cooking packaging bag.

[0078] Perform performance tests on the high-temperature cooking packaging bags of Examples 1-3 and Comparative Examples 1-3. The test results are shown in the following table:

[0079] Sample Melting temperature Tm, °C Water droplet contact angle, ° Steaming at 135°C for 1 h Example 1 174.1 129.8 No shrinkage deformation Example 2 176.9 133.4 No shrinkage deformation Example 3 179.3 137.7 No shrinkage deformation Comparative Example 1 163.5 103.5 Slight shrinkage deformation Comparative Example 2 141.9 90.8 Severe shrinkage deformation Comparative Example 3 165.0 111.6 No shrinkage deformation

[0080] Referring to the data in the above table, based on the comparison between Examples 1-3 and Comparative Examples 1-3, it can be known that the high-temperature cooking packaging bag of the present application has excellent high-temperature resistance, enabling it to be stably used under high-temperature cooking conditions, and has good hydrophobicity, making it not easily adhered by food.

[0081] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0082] The above content is only an example and illustration of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar ways to replace them. As long as they do not deviate from the invention or exceed the scope defined by this application, they should all fall within the protection scope of the present invention.

Claims

1. A high temperature cooking packaging bag, characterized in that: It comprises the following components in parts by weight: 80-90 parts of polypropylene, 13-29 parts of heat-resistant hydrophobic polyester, 4.3-7.3 parts of compatibilizer, 1-5 parts of nano silicon dioxide, 1-5 parts of talc and 0.3-0.7 parts of zinc stearate; Wherein, the temperature-resistant hydrophobic polyester is prepared by the following steps: Step A1: octamethylcyclotetrasiloxane, diphenyldimethoxysilane, 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, tetramethyldisiloxane and concentrated sulfuric acid are added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen is introduced for protection. The mixture is stirred for reaction at a temperature of 0-5° C. and a stirring rate of 300-400 r / min for 20-30 min, and then the mixture is heated to 50-60° C. and stirred for reaction for 5-6 h. After the reaction is completed, the reaction product is cooled to room temperature, and then adjusted to a pH of 7-7.5 with a sodium hydroxide solution, and then vacuum filtered, and the filtrate is rotary evaporated to remove low-boiling substances to obtain a hydrogen-terminated fluorinated phenyl silicone oil; Step A2: Add hydrogen-terminated fluorophenyl silicone oil, allyl alcohol and isopropanol into a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, introduce nitrogen protection, stir and react for 20-30 minutes at a temperature of 10-15° C. and a stirring rate of 300-400 r / min, then add chloroplatinic acid-isopropanol solution and continue stirring and reacting for 4-5 hours under the condition of heating to 75-85° C. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation to obtain hydroxy-terminated fluorophenyl silicone oil; Step A3: Add succinic acid, ethylene glycol, terminal hydroxyl fluorophenyl silicone oil and tetraisopropyl titanate to a three-necked flask equipped with a stirrer, a thermometer and an air duct, introduce nitrogen protection, and stir the reaction for 5-10 minutes at a temperature of 20-25°C and a stirring rate of 300-400r / min, then raise the temperature to 190-200°C and continue to stir the reaction for 5-6 hours, then raise the temperature to 230-240°C and reduce the pressure to 20-25Pa and continue to stir the reaction until the pole climbing phenomenon occurs. After the reaction is completed, the reaction product is cooled to room temperature to obtain a temperature-resistant hydrophobic polyester.

2. A high temperature cooking packaging bag according to claim 1, characterized in that: The polypropylene is L5D98 polypropylene.

3. A high temperature cooking packaging bag according to claim 1, characterized in that: The compatibilizer is PP-g-MAH.

4. The high temperature cooking packaging bag according to claim 1, characterized in that: The usage ratio of the octamethylcyclotetrasiloxane, diphenyldimethoxysilane, 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, tetramethyldisiloxane and concentrated sulfuric acid in step A1 is 25-30 g: 10-16 g: 2.5-4.5 g: 5-7 g: 0.9-1.5 g.

5. The high temperature cooking packaging bag according to claim 1, characterized in that: The mass fraction of the concentrated sulfuric acid in step A1 is 96-98%.

6. The high temperature cooking packaging bag according to claim 1, characterized in that: The mass fraction of the sodium hydroxide solution in step A1 is 18-22%.

7. The high temperature cooking packaging bag according to claim 1, characterized in that: The amount ratio of the hydrogen-terminated fluorinated phenyl silicone oil, allyl alcohol, isopropanol and chloroplatinic acid-isopropanol solution in step A2 is 30-35 g: 2.5-4.5 g: 10-12 mL: 10-15 mL.

8. The high temperature cooking packaging bag according to claim 1, characterized in that: The chloroplatinic acid-isopropanol solution in step A2 is a solution formed by dissolving 0.05-0.09 g of chloroplatinic acid in 10-12 mL of isopropanol.

9. The high temperature cooking packaging bag according to claim 1, characterized in that: The usage ratio of the succinic acid, ethylene glycol, terminal hydroxyl fluorinated phenyl silicone oil and tetraisopropyl titanate in step A3 is 30g: 8-12g: 5-25g: 0.3-0.5g.

10. The high temperature cooking packaging bag according to claim 1, characterized in that: The method for preparing the high temperature cooking packaging bag comprises the following steps: Step 1: Weigh 80-90 parts of polypropylene, 13-29 parts of temperature-resistant hydrophobic polyester, 4.3-7.3 parts of compatibilizer, 1-5 parts of nano-silicon dioxide, 1-5 parts of talc and 0.3-0.7 parts of zinc stearate according to weight parts, and set aside; Step 2: adding polypropylene, temperature-resistant hydrophobic polyester, compatibilizer, nano-silicon dioxide, talcum powder and zinc stearate into a mixer, stirring and mixing, and obtaining a mixture after mixing evenly; Step 3: adding the mixed material into a twin-screw extruder, melt-blending and extruding at a temperature of 185-195° C. and a screw speed of 50-100 r / min, and then granulating to obtain mixed granules; Step 4: blowing the mixed pellets through a film blowing machine to obtain a film with a thickness of 30-50 μm, and then cutting the film into bags to obtain high-temperature cooking packaging bags.