High temperature retort pouch

Abstract

The application 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 traditional food packaging bags are damaged, deformed and food is adhered during high-temperature cooking, and the used and discarded packaging bags are difficult to degrade; the high-temperature cooking packaging bag uses polypropylene and temperature-resistant hydrophobic polyester as main raw materials, the melting point of the polypropylene is high, so that the polypropylene is not easy to break at high temperature, can resist high temperature without melting during the cooking process, the temperature-resistant hydrophobic polyester has good environmental protection, heat resistance and hydrophobicity, under the synergistic action of the polypropylene and the temperature-resistant hydrophobic polyester, the prepared high-temperature cooking packaging bag can keep the integrity and sealing property of the packaging bag during high-temperature cooking, can effectively prevent water permeation, protect food from moisture erosion, prolong the shelf life, is not easy to cause food adhesion, and guarantees the appearance beauty of food.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of food packaging materials, in particular to a high-temperature retort packaging bag. BACKGROUND

[0002] With the increasing demand for food safety and hygiene, food packaging technology has received more and more attention. High-temperature retort packaging bag is a new type of food packaging technology, mainly used for sterilization and processing of food in high-temperature and high-pressure environment. Its core idea is to combine high temperature and steam to effectively kill bacteria and maintain the aroma and taste of food. This packaging method is particularly suitable for scenes with high requirements for food quality and hygiene. Compared with traditional retort packaging, high-temperature retort packaging bag can kill potential harmful microorganisms more quickly, thereby prolonging the shelf life of food.

[0003] However, traditional food packaging bags often break, deform and stick to food during high-temperature retort process, and are difficult to degrade after use and disposal, which cannot meet the high requirements of modern food industry on packaging bags in terms of high-temperature resistance and hydrophobicity. Therefore, it is of great significance to develop a high-temperature retort packaging bag. SUMMARY

[0004] In order to overcome the above technical problems, the purpose of the present application is to provide a high-temperature retort packaging bag, which solves the problem that traditional food packaging bags break, deform and stick to food during high-temperature retort process, and are difficult to degrade after use and disposal.

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

[0006] A high-temperature retort packaging bag comprises the following components 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-silicon dioxide, 1-5 parts of talcum powder and 0.3-0.7 parts of zinc stearate;

[0008] 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 inlet tube, protected by nitrogen, stirred at a temperature of 0-5℃ and a stirring rate of 300-400r / min for 20-30min, then heated to 50-60℃ and stirred for 5-6h, after the reaction, the reaction product is cooled to room temperature, then adjusted to pH 7-7.5 with sodium hydroxide solution, then vacuum filtered, the filtrate is rotary evaporated to remove low boiling point substances, and a terminal hydrogen-containing fluorine phenyl silicone oil is obtained;

[0010] Step A2: the terminal hydrogen-containing fluorine phenyl silicone oil, allyl alcohol and isopropyl alcohol are added into a three-necked flask equipped with a stirrer, a thermometer and a gas inlet tube, protected by nitrogen, stirred at a temperature of 10-15℃ and a stirring rate of 300-400r / min for 20-30min, then chloroplatinic acid-isopropyl alcohol solution is added and heated to 75-85℃ and stirred for 4-5h, after the reaction, the reaction product is cooled to room temperature, then rotary evaporated to remove the solvent, and a terminal hydroxyl-containing fluorine phenyl silicone oil is obtained.

[0011] Step A3: butanedioic acid, ethylene glycol, terminal hydroxyl-containing fluorine phenyl silicone oil and tetraisopropyl titanate are added into a three-necked flask equipped with a stirrer, a thermometer and a gas inlet tube, protected by nitrogen, stirred at a temperature of 20-25℃ and a stirring rate of 300-400r / min for 5-10min, then heated to 190-200℃ and stirred for 5-6h, then heated to 230-240℃ and reduced to 20-25Pa and stirred until the climbing rod phenomenon appears, after the reaction, the reaction product is cooled to room temperature, and a temperature-resistant hydrophobic polyester is obtained.

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

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

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

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

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

[0017] As a further scheme of the present application: the dosage ratio of the end-hydrogen fluorine-containing phenyl silicone oil, allyl alcohol, isopropyl alcohol and chloroplatinic acid-isopropyl alcohol solution in step A2 is 30-35g: 2.5-4.5g: 10-12mL: 10-15mL.

[0018] As a further scheme of the present application: the chloroplatinic acid-isopropyl alcohol solution in step A2 is a solution formed by dissolving chloroplatinic acid in isopropyl alcohol at 0.05-0.09g: 10-12mL.

[0019] As a further scheme of the present application: the dosage ratio of the succinic acid, ethylene glycol, end-hydroxyl fluorine-containing phenyl silicone oil and titanium acid tetraisopropyl ester in step A3 is 30g: 8-12g: 5-25g: 0.3-0.5g.

[0020] As a further scheme of the present application: the preparation method of the high-temperature cooking packaging bag comprises the following steps:

[0021] Step one: weigh the polypropylene 80-90 parts, temperature-resistant hydrophobic polyester 13-29 parts, compatibilizer 4.3-7.3 parts, nano-silicon dioxide 1-5 parts, talcum powder 1-5 parts and zinc stearate 0.3-0.7 parts according to weight parts, and reserve;

[0022] Step two: add the polypropylene, temperature-resistant hydrophobic polyester, compatibilizer, nano-silicon dioxide, talcum powder and zinc stearate into the mixing machine and stir to mix, and uniformly mixed to obtain a mixture;

[0023] Step three: add the mixture into the double-screw extruder, melt blend under the condition of temperature 185-195℃ and screw rotation speed 50-100r / min, then extrude, and granulate to obtain mixed granules;

[0024] Step four: blow the mixed granules into a film through the film blowing machine to obtain a film with thickness 30-50μm, cut the film into bags to obtain the high-temperature cooking packaging bag.

[0025] The beneficial effects of the present application are:

[0026] The high-temperature cooking packaging bag is prepared by the following steps: adding polypropylene, temperature-resistant hydrophobic polyester, compatibilizer, nano silicon dioxide, talcum powder and zinc stearate into a mixer for stirring and mixing, obtaining a mixture after uniform mixing, melting and blending the mixture in a double-screw extruder, then extruding, granulating, blowing a film through a film blowing machine and cutting the film to prepare a bag, thereby obtaining the high-temperature cooking packaging bag; the high-temperature cooking packaging bag uses polypropylene and temperature-resistant hydrophobic polyester as main raw materials, the melting point of polypropylene is high, so that it is not easy to break at high temperature and can resist high temperature without melting during the cooking process; the temperature-resistant hydrophobic polyester has good environmental protection, heat resistance and hydrophobicity; under the synergistic action of polypropylene and temperature-resistant hydrophobic polyester, the prepared high-temperature cooking packaging bag can maintain the integrity and sealing property of the packaging bag during high-temperature cooking, effectively prevent moisture penetration, protect food from moisture erosion, prolong the shelf life, and is not easy to cause food adhesion, thereby ensuring the appearance of food; and the preparation method of the high-temperature cooking packaging bag is simple and efficient, and is suitable for large-scale industrial production.

[0027] In the process of preparing the high-temperature cooking packaging bag, a temperature-resistant hydrophobic polyester is first prepared; first, octamethylcyclotetrasiloxane, diphenyldimethoxysilane, 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane and tetramethyldisiloxane are used as polymerization monomers for polymerization to form an organic silicon containing phenyl and C-F bond and terminated by hydrogen, thereby obtaining end-hydrogen fluorine-containing phenyl silicone oil; then, the end-hydrogen fluorine-containing phenyl silicone oil and allyl alcohol are reacted, Si-H on the end-hydrogen fluorine-containing phenyl silicone oil and alkenyl on the allyl alcohol undergo a silicon-hydrogen addition reaction to form an organic silicon terminated by a hydroxyl group, thereby obtaining end-hydroxyl fluorine-containing phenyl silicone oil; then, butanedioic acid, ethylene glycol and end-hydroxyl fluorine-containing phenyl silicone oil are used as polymerization monomers for copolymerization to form a copolyester, thereby obtaining the temperature-resistant hydrophobic polyester; the temperature-resistant hydrophobic polyester contains a large number of aromatic ring structures, Si-O bonds and C-F bonds on the molecular chain, thereby giving it excellent heat resistance and hydrophobicity, and a large number of ester groups, thereby giving it good biodegradability and good environmental protection. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] Embodiment 1

[0030] The present embodiment is a preparation method of a high-temperature cooking packaging bag, which comprises the following steps:

[0031] Step S1: 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% were added into a three-necked flask equipped with a stirrer, a thermometer, and a gas inlet tube, protected by nitrogen, stirred at a temperature of 0°C and a stirring rate of 300 r / min for 20 min, then continued to be stirred at a temperature of 50°C for 5 h, after the reaction was completed, the reaction product was cooled to room temperature, then adjusted to pH 7 with a sodium hydroxide solution with a mass fraction of 18%, then vacuum filtered, the filtrate was rotary evaporated to remove low-boiling substances, and a terminal hydrogen-containing fluorophenyl silicone oil was obtained;

[0032] Step S2: 30 g of the terminal hydrogen-containing fluorophenyl silicone oil, 2.5 g of allyl alcohol, and 10 mL of isopropyl alcohol were added into a three-necked flask equipped with a stirrer, a thermometer, and a gas inlet tube, protected by nitrogen, stirred at a temperature of 10°C and a stirring rate of 300 r / min for 20 min, then 10 mL of chloroplatinic acid was added to form a chloroplatinic acid-isopropyl alcohol solution with a chloroplatinic acid amount of 0.05 g and a solvent amount of 10 mL, and continued to be stirred at a temperature of 75°C for 4 h, after the reaction was completed, the reaction product was cooled to room temperature, then rotary evaporated to remove the solvent, and a terminal hydroxyl-containing fluorophenyl silicone oil was obtained;

[0033] Step S3: 30 g of succinic acid, 8 g of ethylene glycol, 5 g of the terminal hydroxyl-containing fluorophenyl silicone oil, and 0.3 g of tetraisopropyl titanate were added into a three-necked flask equipped with a stirrer, a thermometer, and a gas inlet tube, protected by nitrogen, stirred at a temperature of 20°C and a stirring rate of 300 r / min for 5 min, then continued to be stirred at a temperature of 190°C for 5 h, then continued to be stirred at a temperature of 230°C and a pressure of 20 Pa until the climbing rod phenomenon appeared, after the reaction was completed, the reaction product was cooled to room temperature, and a temperature-resistant hydrophobic polyester was obtained;

[0034] Step S4: polypropylene 80 parts, temperature-resistant hydrophobic polyester 13 parts, compatibilizer 4.3 parts, nano-silicon dioxide 1 part, talcum powder 1 part, and zinc stearate 0.3 part were weighed according to the weight parts, and reserved;

[0035] Step S5: the polypropylene, temperature-resistant hydrophobic polyester, compatibilizer, nano-silicon dioxide, talcum powder, and zinc stearate were added into a mixer and stirred and mixed, and after being uniformly mixed, a mixture was obtained;

[0036] Step S6: the mixture was added into a twin-screw extruder, melt blended at a temperature of 185°C and a screw rotating speed of 50 r / min, then extruded, and then pelletized, and a mixed granule was obtained;

[0037] Step S7: The mixed granules are blown into a film by a film blowing machine to obtain a film with a thickness of 40 μm, and the film is cut into bags to obtain the high-temperature retort packaging bag.

[0038] Example 2:

[0039] The present embodiment is a method for preparing a high-temperature retort packaging bag, comprising the following steps:

[0040] Step S1: 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% are added into a three-necked flask equipped with a stirrer, a thermometer, and a gas inlet tube, and nitrogen is introduced for protection, and then stirring is performed at a temperature of 3 ℃ and a stirring speed of 350 r / min for 25 min, and then the temperature is raised to 55 ℃, and stirring is continued for 5.5 h, and then the reaction product is cooled to room temperature, and then a sodium hydroxide solution with a mass fraction of 20% is used to adjust the pH to 7.2, and then vacuum filtration is performed, and then the filtrate is subjected to rotary evaporation to remove low-boiling substances, to obtain a terminal-hydrogen-containing fluorophenyl silicone oil;

[0041] Step S2: 32 g of the terminal-hydrogen-containing fluorophenyl silicone oil, 3.5 g of allyl alcohol, and 11 mL of isopropyl alcohol are added into a three-necked flask equipped with a stirrer, a thermometer, and a gas inlet tube, and nitrogen is introduced for protection, and then stirring is performed at a temperature of 12 ℃ and a stirring speed of 350 r / min for 25 min, and then 12 mL of chloroplatinic acid is added in the form of a chloroplatinic acid-isopropyl alcohol solution with a chloroplatinic acid-isopropyl alcohol ratio of 0.07 g:11 mL, and the temperature is raised to 80 ℃, and stirring is continued for 4.5 h, and then the reaction product is cooled to room temperature, and then rotary evaporation is performed to remove the solvent, to obtain a terminal-hydroxyl-containing fluorophenyl silicone oil;

[0042] Step S3: 30 g of succinic acid, 10 g of ethylene glycol, 15 g of the terminal-hydroxyl-containing fluorophenyl silicone oil, and 0.4 g of tetraisopropyl titanate are added into a three-necked flask equipped with a stirrer, a thermometer, and a gas inlet tube, and nitrogen is introduced for protection, and then stirring is performed at a temperature of 22 ℃ and a stirring speed of 350 r / min for 8 min, and then the temperature is raised to 195 ℃, and stirring is continued for 5.5 h, and then the temperature is raised to 235 ℃, and the pressure is reduced to 22 Pa, and stirring is continued until the climbing rod phenomenon appears, and then the reaction product is cooled to room temperature, to obtain a temperature-resistant hydrophobic polyester;

[0043] Step S4: polypropylene 85 parts, temperature-resistant hydrophobic polyester 21 parts, compatibilizer 5.8 parts, nano-silicon dioxide 3 parts, talcum powder 3 parts, and zinc stearate 0.5 part are weighed according to the weight parts, and are ready for use;

[0044] Step S5: polypropylene, temperature-resistant hydrophobic polyester, compatibilizer, nano-silicon dioxide, talcum powder and zinc stearate were added into a mixer and stirred and mixed, and after being uniformly mixed, a mixture was obtained;

[0045] Step S6: the mixture was added into a twin-screw extruder, and after melt blending under the conditions of a temperature of 190°C and a screw rotation speed of 75 r / min, it was extruded, and then granulated to obtain mixed granules;

[0046] Step S7: the mixed granules were blown into a film through a film blowing machine to obtain a film with a thickness of 40 μm, and the film was cut to obtain high-temperature cooking packaging bags.

[0047] Example 3:

[0048] The embodiment is a preparation method of high-temperature cooking packaging bags, comprising the following steps:

[0049] Step S1: 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% were added into a three-necked flask equipped with a stirrer, a thermometer and a gas inlet tube, and protected by nitrogen, and stirred at a temperature of 5°C and a stirring speed of 400 r / min for 30 min, and then the temperature was increased to 60°C, and the reaction was continued for 6 h under stirring, and after the reaction was completed, the reaction product was cooled to room temperature, and then adjusted to pH 7.5 with a sodium hydroxide solution with a mass fraction of 22%, and then vacuum filtered, and the filtrate was rotary evaporated to remove low-boiling substances to obtain a terminal hydrogen-containing fluorophenyl silicone oil;

[0050] Step S2: 35 g of the terminal hydrogen-containing fluorophenyl silicone oil, 4.5 g of allyl alcohol and 12 mL of isopropyl alcohol were added into a three-necked flask equipped with a stirrer, a thermometer and a gas inlet tube, and protected by nitrogen, and stirred at a temperature of 15°C and a stirring speed of 400 r / min for 30 min, and then 15 mL of chloroplatinic acid was added to form a chloroplatinic acid-isopropyl alcohol solution with a chloroplatinic acid-isopropyl alcohol solution of 0.09 g: 12 mL dissolved in isopropyl alcohol, and the temperature was increased to 85°C, and the reaction was continued for 5 h under stirring, and after the reaction was completed, the reaction product was cooled to room temperature, and then rotary evaporated to remove the solvent to obtain a terminal hydroxyl-containing fluorophenyl silicone oil;

[0051] Step S3: 30 g of succinic acid, 12 g of ethylene glycol, 25 g of hydroxyl-terminated fluorine-containing phenyl silicone oil, and 0.5 g of titanium tetrakis isopropylate were added into a three-necked flask equipped with a stirrer, a thermometer, and a gas inlet tube, and protected by nitrogen, stirred at a temperature of 25°C and a stirring speed of 400 r / min for 10 min, then heated to 200°C and continued to stir for 6 h, then heated to 240°C and reduced to 25 Pa, and continued to stir until the pole-climbing phenomenon appeared, and the reaction was completed. The reaction product was cooled to room temperature to obtain a temperature-resistant hydrophobic polyester;

[0052] Step S4: polypropylene 90 parts, temperature-resistant hydrophobic polyester 29 parts, compatibilizer 7.3 parts, nano-silicon dioxide 5 parts, talcum powder 5 parts, and zinc stearate 0.7 parts were weighed according to the weight parts, and prepared for use;

[0053] Step S5: polypropylene, temperature-resistant hydrophobic polyester, compatibilizer, nano-silicon dioxide, talcum powder, and zinc stearate were added into a mixer and stirred and mixed, and the mixture was obtained after uniform mixing;

[0054] Step S6: the mixture was added into a twin-screw extruder, and after melt blending at a temperature of 195°C and a screw speed of 100 r / min, it was extruded, and then granulated to obtain a mixed granule;

[0055] Step S7: the mixed granule was blown into a film by a film blowing machine to obtain a film with a thickness of 40 μm, and the film was cut to make a bag, and a high-temperature cooking packaging bag was obtained.

[0056] Comparative Example 1:

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

[0058] Step S1: polypropylene 90 parts, compatibilizer 7.3 parts, nano-silicon dioxide 5 parts, talcum powder 5 parts, and zinc stearate 0.7 parts were weighed according to the weight parts, and prepared for use;

[0059] Step S2: polypropylene, compatibilizer, nano-silicon dioxide, talcum powder, and zinc stearate were added into a mixer and stirred and mixed, and the mixture was obtained after uniform mixing;

[0060] Step S3: the mixture was added into a twin-screw extruder, and after melt blending at a temperature of 195°C and a screw speed of 100 r / min, it was extruded, and then granulated to obtain a mixed granule;

[0061] Step S4: the mixed granule was blown into a film by a film blowing machine to obtain a film with a thickness of 40 μm, and the film was cut to make a bag, and a high-temperature cooking packaging bag was obtained.

[0062] Comparative Example 2:

[0063] The present comparative example is a preparation method of a high-temperature retort packaging bag, comprising the following steps:

[0064] Step S1: 30g of succinic acid, 12g of ethylene glycol and 0.5g of titanium acid tetraisopropyl ester were added into a three-necked flask equipped with a stirrer, a thermometer and a gas inlet tube, and protected by nitrogen. The reaction was stirred at a temperature of 25℃ and a stirring rate of 400r / min for 10min, then the temperature was raised to 200℃ and the reaction was continued for 6h, then the temperature was raised to 240℃ and the pressure was reduced to 25Pa, and the reaction was continued until the climbing rod phenomenon appeared. After the reaction was completed, the reaction product was cooled to room temperature to obtain a polyester;

[0065] Step S2: polypropylene 90 parts, polyester 29 parts, compatibilizer 7.3 parts, nano-silicon dioxide 5 parts, talcum powder 5 parts and zinc stearate 0.7 parts were weighed according to the weight parts, and were ready for use;

[0066] Step S3: the polypropylene, polyester, compatibilizer, nano-silicon dioxide, talcum powder and zinc stearate were added into a mixer and stirred and mixed, and the mixture was obtained after being uniformly mixed;

[0067] Step S4: the mixture was added into a twin-screw extruder, and was extruded after being melt blended at a temperature of 195℃ and a screw rotation speed of 100r / min, and was granulated to obtain a mixed granule;

[0068] Step S5: the mixed granule was blown into a film by a film blowing machine to obtain a film with a thickness of 40μm, and the film was cut to make a bag to obtain a high-temperature retort packaging bag.

[0069] Comparative Example 3:

[0070] The present comparative example is a preparation method of a high-temperature retort packaging bag, comprising the following steps:

[0071] Step S1: 30g of octamethylcyclotetrasiloxane, 7g of tetramethylsiloxane and 1.5g of concentrated sulfuric acid with a mass fraction of 98% were added into a three-necked flask equipped with a stirrer, a thermometer and a gas inlet tube, and protected by nitrogen. The reaction was stirred at a temperature of 5℃ and a stirring rate of 400r / min for 30min, then the temperature was raised to 60℃ and the reaction was continued for 6h. After the reaction was completed, the reaction product was cooled to room temperature, then a sodium hydroxide solution with a mass fraction of 22% was used to adjust the pH to 7.5, then vacuum filtration was performed, and the filtrate was rotary evaporated to remove low-boiling substances to obtain a hydrogen-terminated silicone oil;

[0072] Step S2: 35 g of end-hydrogen silicone oil, 4.5 g of allyl alcohol, and 12 mL of isopropyl alcohol were added into a three-neck flask equipped with a stirrer, a thermometer, and a gas inlet tube, and stirred at a temperature of 15°C and a stirring rate of 400 r / min for 30 min under nitrogen protection. Then, 15 mL of chloroplatinic acid was added to form a chloroplatinic acid-isopropyl alcohol solution with a concentration of 0.09 g: 12 mL, and the reaction was continued to be stirred at a temperature of 85°C for 5 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain end-hydroxyl silicone oil.

[0073] Step S3: 30 g of succinic acid, 12 g of ethylene glycol, 25 g of end-hydroxyl silicone oil, and 0.5 g of tetraisopropyl titanate were added into a three-neck flask equipped with a stirrer, a thermometer, and a gas inlet tube, and stirred at a temperature of 25°C and a stirring rate of 400 r / min for 10 min under nitrogen protection. Then, the temperature was increased to 200°C, and the reaction was continued to be stirred for 6 h. Then, the temperature was increased to 240°C, and the pressure was reduced to 25 Pa, and the reaction was continued to be stirred until the climbing rod phenomenon appeared. After the reaction was completed, the reaction product was cooled to room temperature to obtain a temperature-resistant hydrophobic polyester.

[0074] Step S4: The polypropylene 90 parts, the temperature-resistant hydrophobic polyester 29 parts, the compatibilizer 7.3 parts, the nano-silicon dioxide 5 parts, the talc powder 5 parts, and the zinc stearate 0.7 parts were weighed according to the weight parts, and were prepared for use.

[0075] Step S5: The polypropylene, the temperature-resistant hydrophobic polyester, the compatibilizer, the nano-silicon dioxide, the talc powder, and the zinc stearate were added into a mixer and stirred and mixed. After being uniformly mixed, a mixture was obtained.

[0076] Step S6: The mixture was added into a twin-screw extruder, and was melt blended at a temperature of 195°C and a screw rotation rate of 100 r / min, and then was extruded. After that, the extrudate was pelletized to obtain a mixed granule.

[0077] Step S7: The mixed granule was blown into a film by a film blowing machine to obtain a film with a thickness of 40 μm. The film was cut to prepare a bag, and a high-temperature cooking packaging bag was obtained.

[0078] The high-temperature cooking packaging bags of Examples 1-3 and Comparative Examples 1-3 were tested for performance, and the test results are shown in the following table:

[0079] Sample Melting temperature Tm, °C Water drop contact angle, ° 135°C cooking 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] According to the comparison between Examples 1-3 and Comparative Examples 1-3, it can be seen from the data in the above table that the high-temperature cooking packaging bag of the present application has excellent high-temperature resistance, so that it can be stably used under high-temperature cooking conditions, and has good hydrophobicity, so that it is not easily adhered by food.

[0081] In the description of the specification, reference to terms "one embodiment", "an example", "a specific example" and so on is meant to indicate that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. Descriptive terms of the above-mentioned terms do not necessarily refer to the same embodiment or example in the specification. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner.

[0082] The above is only an example and illustration of the application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or replace them with similar ways, as long as they do not deviate from the application or exceed the scope defined in the application.

Claims

1. A retort pouch for high-temperature retorting, characterized by comprising: The following components by weight are included: polypropylene 80-90 parts, temperature-resistant hydrophobic polyester 13-29 parts, compatibilizer 4.3-7.3 parts, nano-silicon dioxide 1-5 parts, talcum powder 1-5 parts, and zinc stearate 0.3-0.7 parts; 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 a gas inlet tube, nitrogen is introduced for protection, stirring is carried out at a temperature of 0-5℃ and a stirring rate of 300-400r / min for 20-30min, then the temperature is raised to 50-60℃ and stirring is continued for 5-6h, after the reaction is completed, the reaction product is cooled to room temperature, then a sodium hydroxide solution is used to adjust the pH to 7-7.5, then vacuum filtration is carried out, the filtrate is rotary evaporated to remove low-boiling substances, and a terminal hydrogen-containing fluorophenyl silicone oil is obtained; Step A2: the terminal hydrogen-containing fluorophenyl silicone oil, allyl alcohol, and isopropyl alcohol are added to a three-necked flask equipped with a stirrer, a thermometer, and a gas inlet tube, nitrogen is introduced for protection, stirring is carried out at a temperature of 10-15℃ and a stirring rate of 300-400r / min for 20-30min, then chloroplatinic acid-isopropyl alcohol solution is added and the temperature is raised to 75-85℃ and stirring is continued for 4-5h, after the reaction is completed, the reaction product is cooled to room temperature, then rotary evaporation is carried out to remove the solvent, and a terminal hydroxyl-containing fluorophenyl silicone oil is obtained; Step A3: butanedioic acid, ethylene glycol, the terminal hydroxyl-containing fluorophenyl silicone oil, and tetraisopropyl titanate are added to a three-necked flask equipped with a stirrer, a thermometer, and a gas inlet tube, nitrogen is introduced for protection, stirring is carried out at a temperature of 20-25℃ and a stirring rate of 300-400r / min for 5-10min, then the temperature is raised to 190-200℃ and stirring is continued for 5-6h, then the temperature is raised to 230-240℃ and the pressure is reduced to 20-25Pa and stirring is continued until the climbing rod phenomenon appears, after the reaction is completed, the reaction product is cooled to room temperature, and a temperature-resistant hydrophobic polyester is obtained.

2. The retort pouch according to claim 1, wherein The polypropylene is L5D98 polypropylene.

3. The retort pouch according to claim 1, wherein The compatibilizer is PP-g-MAH.

4. The retort pouch according to claim 1, wherein The amount 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 25-30g:10-16g:2.5-4.5g:5-7g:0.9-1.5g.

5. The retort pouch according to claim 1, wherein The mass fraction of the concentrated sulfuric acid in Step A1 is 96-98%.

6. The retort pouch according to claim 1, wherein The mass fraction of the sodium hydroxide solution in Step A1 is 18-22%.

7. The retort pouch according to claim 1, wherein The amount ratio of the terminal hydrogen-containing fluorophenyl silicone oil, allyl alcohol, isopropyl alcohol, and chloroplatinic acid-isopropyl alcohol solution in Step A2 is 30-35g:2.5-4.5g:10-12mL:10-15mL.

8. The retort pouch according to claim 1, wherein The chloroplatinic acid-isopropyl alcohol solution in step A2 is a solution of chloroplatinic acid dissolved in isopropyl alcohol in a ratio of 0.05-0.09 g: 10-12 mL.

9. The retort pouch according to claim 1, wherein The ratio of the amounts of the succinic acid, ethylene glycol, hydroxyl-terminated fluorine-containing phenyl silicone oil and titanium tetraisopropylate in step A3 is 30 g: 8-12 g: 5-25 g: 0.3-0.5 g.

10. The retort pouch according to claim 1, wherein The preparation method of the high-temperature cooking packaging bag comprises the following steps: Step one: weigh the polypropylene 80-90 parts, the temperature-resistant hydrophobic polyester 13-29 parts, the compatibilizer 4.3-7.3 parts, the nano silicon dioxide 1-5 parts, the talc 1-5 parts and the zinc stearate 0.3-0.7 parts according to the weight parts, and reserve them; Step two: add the polypropylene, the temperature-resistant hydrophobic polyester, the compatibilizer, the nano silicon dioxide, the talc and the zinc stearate into a mixer and stir and mix them, and obtain the mixture after uniform mixing; Step three: add the mixture into a double-screw extruder, melt blend under the conditions of a temperature of 185-195 DEG C and a screw rotating speed of 50-100 r / min, then extrude, and granulate to obtain the mixed granules; Step four: blow the mixed granules into a film through a film blowing machine to obtain a film with a thickness of 30-50 microns, cut the film into bags, and obtain the high-temperature cooking packaging bag.