Grape protection bag for color conversion of grape variety with difficult coloring in hot area and using method thereof

Abstract

The application discloses a grape protection bag for color changing of grape varieties difficult to color in a hot area and a use method thereof, and relates to the technical field of grape planting. The grape protection bag for color changing of grape varieties difficult to color in a hot area comprises a reflective upper bag body and a reflective cup body, the lower end of the reflective upper bag body is provided with an opening, the opening is connected with the cup opening of the reflective cup body, and the inner wall of the reflective upper bag body and the inner wall of the reflective cup body enclose a closed containing cavity capable of reflecting light. A plurality of light transmission holes are arranged on the top of the reflective upper bag body, and a waterproof film for light transmission and air permeation is arranged at the light transmission holes. The reflective cup body comprises, from inside to outside, a protective layer, an aluminum plating layer and a cup body base layer. The reflective upper bag body comprises, from inside to outside, a protective layer, an aluminum plating layer and an upper bag body base layer.

Description

Technical Field

[0001] This invention relates to the field of grape cultivation technology, specifically to a grape protective bag for color change of grape varieties that are difficult to color in hot regions and its application method. Background Technology

[0002] In tropical and subtropical regions, due to unique climatic conditions, grape buds sprout early, and the growing season is often characterized by simultaneous hot and humid conditions. Although higher temperatures are beneficial for fruit ripening, sunlight in these regions is not always sufficient. Especially in southern my country, the veraison period typically occurs from late May to the end of June. During this period, frequent summer rainfall, high temperatures and humidity, and insufficient sunlight severely affect the normal coloring process of grape varieties that require high light levels, and may even prevent the grapes from coloring at all. Furthermore, since grape cultivation often employs greenhouse cultivation, while this effectively reduces diseases caused by rainwater, the plastic film used in greenhouse cultivation also blocks some natural sunlight and reduces ventilation, further weakening the light intensity received by the grapes during the veraison period. Poor ventilation further affects the veraison process. Moreover, during this period, the environment under the grape canopy is not only hot and poorly ventilated, but also has extremely unfavorable light conditions, which again affects the veraison process.

[0003] In actual production, to prevent damage from pests and diseases, grapes are usually bagged, especially in southern regions. However, traditional bagging further reduces the intensity of sunlight reaching the fruit surface, posing a challenge for grape varieties that are inherently difficult to color. Furthermore, if transparent bags are used, their poor breathability can cause a rapid rise in grape skin temperature due to direct sunlight, leading to heat scorching, making them unsuitable for use in southern grape production. High temperature and humidity create what is known as "high-temperature coloring barrier," affecting the coloring of red (and black) grape varieties.

[0004] Given the above, designing a grape protective bag that can both cool the grapes and enhance light penetration is particularly important. An ideal grape protective bag should have good light transmittance, allowing light to enter the bag and ensuring that the entire bunch of grapes receives sufficient and even light through a special reflective design, thereby promoting grape coloring. Furthermore, appropriate openings in the bag not only allow light to pass through but also provide ventilation, helping to lower the surface temperature of the fruit and creating a more suitable microenvironment for grape coloring. Summary of the Invention

[0005] The purpose of this invention is to provide a grape protective bag for color change of grape varieties that are difficult to color in hot regions and its method of use, so as to solve the technical problems mentioned in the background art.

[0006] The technical solution to achieve the objective of this invention is:

[0007] A grape protection bag for color change of grape varieties that are difficult to color in hot regions includes a reflective upper bag body and a reflective cup body. The lower end of the reflective upper bag body has an opening that connects to the mouth of the reflective cup body. The inner wall of the reflective upper bag body and the inner wall of the reflective cup body form a closed reflective cavity. The reflective upper bag body includes a bag body and multiple light-transmitting holes near the top of the bag body. A waterproof membrane for light transmission and air permeability is installed at the light-transmitting holes. The reflective cup body includes, from the inside out, a protective layer, an aluminum-plated layer, and a cup body base layer. The bag body includes, from the inside out, a protective layer, an aluminum-plated layer, and an upper bag body base layer.

[0008] Furthermore, a connecting unit is provided between the reflective upper bag body and the reflective cup body. The connecting unit includes an upper support ring coaxially connected to the opening of the reflective upper bag body, a lower support ring coaxially connected to the cup mouth of the reflective cup body, and a plurality of support rods spaced between the upper support ring and the lower support ring and connected to the upper support ring and the lower support ring. A waterproof membrane for light transmission and air permeability is provided between adjacent support rods.

[0009] Furthermore, the reflective upper bag is fitted over multiple radial skeletons and a shaping ring, with the multiple radial skeletons connected between the shaping ring and the upper support ring to support the reflective upper bag.

[0010] Furthermore, the multiple light-transmitting holes are arranged coaxially at the top near the upper bag body, so that light can directly enter the receiving cavity from the light-transmitting holes.

[0011] Further, the preparation method of the bag body is as follows: vacuum aluminum plating is performed on a base layer of upper bag body with a thickness of 0.01 to 0.02 mm to obtain an aluminum plating layer of 300 to 400 angstroms. Then, a protective coating with a thickness of 0.3 to 0.6 μm is applied on the aluminum plating layer and then dried at room temperature. Subsequently, an ethylene solution with a mass of 0.2 to 0.4 times that of the protective coating is sprayed to obtain the bag body.

[0012] Furthermore, the preparation method of the reflective cup body is as follows: vacuum aluminum is deposited on the inner wall of the cup body base with a thickness of 1 mm to obtain an aluminum layer of 300-400 angstroms. Then, a protective coating with a thickness of 0.3-0.6 μm is applied on the aluminum layer and then dried at room temperature. Subsequently, an ethylene solution with a mass of 0.2-0.4 times that of the protective coating is sprayed to obtain the reflective cup body.

[0013] Furthermore, the base material of the cup body is made of PMMA (polymethyl methacrylate).

[0014] Furthermore, the protective coating is prepared by adding 30-50 parts by weight of methyl ethyl ketone to a mixing tank under nitrogen protection, stirring uniformly at a constant temperature of 25-30°C for 5-15 minutes, and then sequentially adding 5-10 parts by weight of ethyl acetate, 40-60 parts by weight of resin base, and 2-4 parts by weight of guar gum to the mixing tank while stirring. After all the additions are completed, stirring is continued for 23-25 ​​hours to obtain the protective coating.

[0015] Furthermore, the preparation method of the resin base is as follows: 40 parts by mass of xylene are placed in a reaction vessel, and the temperature is raised to 84-86°C while stirring. Then, a mixture of 2-3 parts by mass of methyl methacrylate, 2-3 parts by mass of hydroxyethyl methacrylate, 0.2-0.4 parts by mass of 2,4,6-tris(2-allylphenoxy)-1,3,5-triazine, and 0.01-0.012 parts by mass of initiator is added dropwise. After 3 hours, the dropwise addition is stopped, and the reaction is continued at the temperature for another 3 hours to obtain the resin base.

[0016] Furthermore, the initiator includes azoisobutyronitrile.

[0017] Furthermore, the ethylene solution is prepared as follows: under nitrogen protection, 2-4 parts by mass of liquid ethylene and 100 parts by mass of diethyl ether are mixed and stirred at 100-200 rpm for 10-20 min to obtain an ethylene solution.

[0018] A method for using a grape protection bag for color change of a grape variety that is difficult to color in hot regions involves placing the grape protection bag over the outside of the grape bunch before color change, and then tightening the reflective upper bag body at the top of the shaping ring.

[0019] By adopting the above technical solution, the present invention has the following beneficial effects:

[0020] (1) The grape protection bag for color change of hot-zone difficult-to-color grape varieties of the present invention includes a reflective upper bag body and a reflective cup body. The lower end of the reflective upper bag body has an opening, which is connected to the cup mouth of the reflective cup body. The inner wall of the reflective upper bag body and the inner wall of the reflective cup body form a closed reflective cavity. The reflective upper bag body includes a bag body and a plurality of light-transmitting holes near the top of the bag body. A waterproof film for light transmission and air permeability is installed at the light-transmitting holes. The cavity is used to place grape bunches. Natural light enters the cavity inside the grape protection bag for color change of hot-zone difficult-to-color grape varieties through the light-transmitting holes and is reflected by the inner walls of the reflective upper bag body and the reflective cup body, so that the light is evenly irradiated onto the grape bunches, increasing the light intensity of each part of the grape bunches. To avoid the direct sunlight that causes a rapid rise in grape skin temperature due to conventional transparent fruit bags, and because transparent bags have poor ventilation and breathability, they are prone to high-temperature scorching, which can affect the coloring progress of grape varieties that are difficult to color, or even prevent them from coloring at all. This improves grape quality, promotes the accumulation of anthocyanins and accelerates the color-changing process. At the same time, the light-transmitting holes are made of a waterproof film with light-transmitting and breathable properties. This ensures that light can enter the container smoothly for illumination, while also allowing air to flow freely in and out of the container to remove the heat inside. Compared with the openings in traditional grape protective bags, the waterproof film with light-transmitting and breathable properties on the ventilation holes can greatly prevent the impact of dust, mold, pesticides, etc. on the grape bunches, and it can be used throughout the growing season.

[0021] (2) A connecting unit is provided between the reflective upper bag body and the reflective cup body of the present invention to connect the reflective upper bag body and the reflective cup body together. The connecting unit includes an upper support ring coaxially connected to the opening of the reflective upper bag body, a lower support ring coaxially connected to the cup mouth of the reflective cup body, and a plurality of support rods spaced between the upper support ring and the lower support ring and connected to the upper support ring and the lower support ring. A waterproof film for light transmission and air transmission is provided between adjacent support rods, forming a second light-transmitting and air-transmitting area on the grape protection bag for grape varieties that are difficult to color in hot areas. On the one hand, more light can be transmitted. On the other hand, air can flow between the second light-transmitting and air-transmitting area and the light-transmitting opening of the reflective upper bag body, avoiding air only flowing above the reflective upper bag body. This increases the air flow in the grape protection bag for grape varieties that are difficult to color in hot areas, and can better remove the temperature in the containing cavity, making the temperature in the containing cavity uniform and avoiding high temperature concentration in the reflective cup body to hinder the color change of the grapes below.

[0022] (3) The reflective upper bag body of the present invention is installed on the outside of multiple radial skeletons and shaping rings. These radial skeletons connect the shaping rings and the upper support rings, and together support the reflective upper bag body.

[0023] (3) The reflective cup body of the present invention includes a protective layer, an aluminum plating layer and a cup body base layer from the inside to the outside, and the bag body includes a protective layer, an aluminum plating layer and an upper bag body base layer from the inside to the outside. The reflective performance of the reflective cup body is increased by combining the metal layer with the structure of the reflective cup body.

[0024] (4) In the preparation of the reflective cup body of the present invention, the inner wall of the base layer of the cup body is vacuum-plated with aluminum, coated with a protective coating, and sprayed with ethylene solution. Ethylene can not only accelerate the ripening process of grapes, but also promote the synthesis of pigments such as anthocyanins. The accumulation of these pigments will lead to changes in the color of grapes, thereby promoting the color change of the fruit.

[0025] (5) The protective coating of the present invention is obtained by mixing butanone, ethyl acetate, resin base and guar gum. The resin base is obtained by copolymerizing methyl methacrylate, hydroxyethyl methacrylate and 2,4,6-tris(2-allylphenoxy)-1,3,5-triazine to obtain a hyperbranched structure. A cavity is formed in the resin base, and the inner wall of the cavity contains active groups such as hydroxyl groups. Combined with guar gum, it can effectively adsorb ethylene solution and release ethylene slowly, thereby further promoting the color change of the fruit. Attached Figure Description

[0026] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0027] Figure 1 This is a cross-sectional schematic diagram of the reflective cup body of a grape protective bag for color change of grape varieties that are difficult to color in hot zones, according to an embodiment of the present invention.

[0028] The labels in the attached diagram are as follows: reflective upper bag body 1, reflective cup body 2, shaping ring 1-1, radial skeleton 1-2, light-transmitting hole 1-3, bag body 1-4, cup body base layer 2-1, protective layer 2-2, aluminum plating layer 2-3, connecting unit 3, upper support ring 3-1, lower support ring 3-2, and support rod 3-3. Detailed Implementation

[0029] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of the embodiments of the present invention, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0034] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances. The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and should not be used to limit the scope of protection of the present invention.

[0035] (General Implementation)

[0036] See Figure 1 A grape protection bag for color change of grape varieties that are difficult to color in hot regions includes a reflective upper bag body and a reflective cup body. The lower end of the reflective upper bag body has an opening that connects to the mouth of the reflective cup body. The inner wall of the reflective upper bag body and the inner wall of the reflective cup body form a closed, reflective cavity. The reflective upper bag body includes a bag body and multiple light-transmitting holes located near the top of the bag body. The multiple light-transmitting holes are arranged in a circular array and coaxially on the top of the upper bag body to form multiple annular light-transmitting hole layers. A waterproof film for light transmission and air permeability is installed at the light-transmitting holes. The reflective cup body includes, from the inside out, a protective layer, an aluminum-plated layer, and a cup body base layer. The bag body includes, from the inside out, a protective layer, an aluminum-plated layer, and an upper bag body base layer.

[0037] A connecting unit is provided between the reflective upper bag and the reflective cup. The connecting unit includes an upper support ring coaxially connected to the opening of the reflective upper bag, a lower support ring coaxially connected to the cup opening of the reflective cup, and multiple support rods spaced between the upper and lower support rings and connected to the upper and lower support rings. A waterproof membrane for light transmission and air permeability is provided between adjacent support rods.

[0038] The reflective upper bag is fitted over multiple radial skeletons and a shaping ring. The multiple radial skeletons are connected between the shaping ring and the upper support ring to support the reflective upper bag.

[0039] The bag body is prepared as follows: vacuum aluminum is deposited on a base layer of upper bag body with a thickness of 0.01 to 0.02 mm to obtain an aluminum layer of 300 to 400 angstroms. Then, a protective coating with a thickness of 0.3 to 0.6 μm is applied on the aluminum layer and then dried at room temperature. Finally, an ethylene solution with a mass of 0.2 to 0.4 times the mass of the protective coating is sprayed to obtain the bag body.

[0040] The upper bag body base layer and the waterproof membrane used for light transmission and breathability both use transparent waterproof PU film from Wuhan Huwei Technology Co., Ltd. This transparent waterproof PU film boasts high transparency, excellent waterproofness and breathability, with a breathability of 1000–3000 g / m³. 2 It is 24h, and also has good transparency, light transmission, breathability and waterproof performance.

[0041] The preparation method of the reflective cup body is as follows: vacuum aluminum is deposited on the inner wall of the cup body base with a thickness of 1 mm to obtain an aluminum layer of 300-400 angstroms. Then, a protective coating with a thickness of 0.3-0.6 μm is applied on the aluminum layer and then dried at room temperature. Finally, an ethylene solution with a mass of 0.2-0.4 times that of the protective coating is sprayed to obtain the reflective cup body.

[0042] The base material of the cup body is PMMA.

[0043] The protective coating is prepared by adding 30-50 parts by weight of methyl ethyl ketone to a mixing tank under nitrogen protection, stirring evenly at a constant temperature of 25-30°C for 5-15 minutes, and then sequentially adding 5-10 parts by weight of ethyl acetate, 40-60 parts by weight of resin base, and 2-4 parts by weight of guar gum to the mixing tank while stirring. After all the additions are completed, stirring is continued for 23-25 ​​hours to obtain the protective coating.

[0044] The resin base material is prepared as follows: 40 parts by mass of xylene are placed in a reaction vessel, and the temperature is raised to 84-86°C while stirring. Then, a mixture of 2-3 parts by mass of methyl methacrylate, 2-3 parts by mass of hydroxyethyl methacrylate, 0.2-0.4 parts by mass of 2,4,6-tris(2-allylphenoxy)-1,3,5-triazine, and 0.01-0.012 parts by mass of initiator is added dropwise. The dropwise addition is stopped after 3 hours, and the reaction is continued at the temperature for another 3 hours to obtain the resin base material.

[0045] The initiator includes azoisobutyronitrile.

[0046] The ethylene solution is prepared as follows: Under nitrogen protection, 2-4 parts by mass of liquid ethylene and 100 parts by mass of diethyl ether are mixed and stirred at 100-200 rpm for 10-20 min to obtain the ethylene solution.

[0047] (Example 1)

[0048] Based on the structure of the grape protective bag for color change of hot-zone difficult-to-color grape varieties in the general embodiment, the preparation method of the bag body in this embodiment is as follows: vacuum aluminum is deposited on a 0.01mm thick upper bag body base layer to obtain an aluminum layer of 300 angstroms. Then, a 0.3μm thick protective coating is applied on the aluminum layer and then dried at room temperature. Subsequently, an ethylene solution with a mass of 0.2 times that of the protective coating is sprayed to obtain the bag body.

[0049] The upper bag body base layer and the waterproof membrane used for light transmission and breathability both use transparent waterproof PU film from Wuhan Huwei Technology Co., Ltd. This transparent waterproof PU film boasts high transparency, excellent waterproofness and breathability, with a breathability of 1000–3000 g / m³. 2 It is 24h, and also has good transparency, light transmission, breathability and waterproof performance.

[0050] The preparation method of the reflective cup body in this embodiment is as follows: vacuum aluminum is deposited on the inner wall of the cup body base with a thickness of 1 mm to obtain an aluminum layer of 300 angstroms. Then, a protective layer coating with a thickness of 0.3 μm is applied on the aluminum layer and then dried at room temperature. Subsequently, an ethylene solution with a mass of 0.2 times that of the protective layer coating is sprayed to obtain the reflective cup body.

[0051] The base material of the cup body is PMMA.

[0052] The protective coating is prepared by adding 30 parts by weight of methyl ethyl ketone to a mixing tank under nitrogen protection, stirring evenly at a constant temperature of 25°C for 5 minutes, and then adding 5 parts by weight of ethyl acetate, 40 parts by weight of resin base, and 2 parts by weight of guar gum to the mixing tank while stirring. After the addition is complete, stirring is continued for 23 hours to obtain the protective coating.

[0053] The resin base material is prepared as follows: 40 parts by mass of xylene are placed in a reaction vessel, and the temperature is raised to 84°C while stirring. Then, a mixture of 2 parts by mass of methyl methacrylate, 2 parts by mass of hydroxyethyl methacrylate, 0.2 parts by mass of 2,4,6-tris(2-allylphenoxy)-1,3,5-triazine, and 0.01 parts by mass of initiator is added dropwise. The dropwise addition is stopped after 3 hours, and the reaction is continued at the temperature for another 3 hours to obtain the resin base material.

[0054] The initiator includes azoisobutyronitrile.

[0055] The ethylene solution is prepared as follows: Under nitrogen protection, 2 parts by mass of liquid ethylene and 100 parts by mass of diethyl ether are mixed and stirred at 100 rpm for 10 min to obtain an ethylene solution.

[0056] (Example 2)

[0057] Based on the structure of the grape protective bag for color change of grape varieties with difficult coloring in hot zones in the general embodiment, the preparation method of the bag body in this embodiment is as follows: vacuum aluminum plating is performed on a 0.015mm thick upper bag body base layer to obtain an aluminum plating layer of 300 angstroms. Then, a 0.5μm thick protective coating is applied to the aluminum plating layer and then dried at room temperature. Subsequently, an ethylene solution with a mass of 0.3 times that of the protective coating is sprayed to obtain the bag body.

[0058] The upper bag body base layer and the waterproof membrane used for light transmission and breathability both use transparent waterproof PU film from Wuhan Huwei Technology Co., Ltd. This transparent waterproof PU film boasts high transparency, excellent waterproofness and breathability, with a breathability of 1000–3000 g / m³. 2 It is 24h, and also has good transparency, light transmission, breathability and waterproof performance.

[0059] The preparation method of the reflective cup body in this embodiment is as follows: vacuum aluminum is deposited on the inner wall of the cup body base with a thickness of 1 mm to obtain an aluminum layer of 300 angstroms. Then, a protective coating with a thickness of 0.5 μm is applied on the aluminum layer and then dried at room temperature. Subsequently, an ethylene solution with a mass of 0.3 times that of the protective coating is sprayed to obtain the reflective cup body.

[0060] The base material of the cup body is PMMA.

[0061] The protective coating is prepared by adding 40 parts by weight of methyl ethyl ketone to a mixing tank under nitrogen protection, stirring uniformly at a constant temperature of 28°C for 10 minutes, and then adding 8 parts by weight of ethyl acetate, 50 parts by weight of resin base, and 3 parts by weight of guar gum to the mixing tank while stirring. After the addition is complete, stirring is continued for 24 hours to obtain the protective coating.

[0062] The resin base material is prepared as follows: 40 parts by mass of xylene are placed in a reaction vessel, and the temperature is raised to 85°C while stirring. Then, a mixture of 2.5 parts by mass of methyl methacrylate, 2.5 parts by mass of hydroxyethyl methacrylate, 0.3 parts by mass of 2,4,6-tris(2-allylphenoxy)-1,3,5-triazine, and 0.011 parts by mass of initiator is added dropwise. The dropwise addition is stopped after 3 hours, and the reaction is continued at the temperature for another 3 hours to obtain the resin base material.

[0063] The initiator includes azoisobutyronitrile.

[0064] The ethylene solution is prepared as follows: Under nitrogen protection, 3 parts by mass of liquid ethylene and 100 parts by mass of diethyl ether are mixed and stirred at 150 rpm for 15 min to obtain an ethylene solution.

[0065] (Example 3)

[0066] Based on the structure of the grape protective bag for color change of grape varieties with difficult coloring in hot zones in the general embodiment, the preparation method of the bag body in this embodiment is as follows: vacuum aluminum plating is performed on a 0.02 mm thick upper bag body base layer to obtain an aluminum plating layer of 400 angstroms. Then, a 0.6 μm thick protective coating is applied to the aluminum plating layer and then dried at room temperature. Subsequently, an ethylene solution with a mass of 0.4 times that of the protective coating is sprayed to obtain the bag body.

[0067] The upper bag body base layer and the waterproof membrane used for light transmission and breathability both use transparent waterproof PU film from Wuhan Huwei Technology Co., Ltd. This transparent waterproof PU film boasts high transparency, excellent waterproofness and breathability, with a breathability of 1000–3000 g / m³. 2 It is 24h, and also has good transparency, light transmission, breathability and waterproof performance.

[0068] The preparation method of the reflective cup body in this embodiment is as follows: vacuum aluminum is deposited on the inner wall of the cup body base with a thickness of 1 mm to obtain an aluminum layer of 400 angstroms. Then, a protective layer coating with a thickness of 0.6 μm is applied on the aluminum layer and then dried at room temperature. Subsequently, an ethylene solution with a mass of 0.4 times that of the protective layer coating is sprayed to obtain the reflective cup body.

[0069] The base material of the cup body is PMMA.

[0070] The protective coating is prepared by adding 50 parts by weight of methyl ethyl ketone to a mixing tank under nitrogen protection, stirring uniformly at a constant temperature of 30°C for 15 minutes, and then adding 10 parts by weight of ethyl acetate, 60 parts by weight of resin base, and 4 parts by weight of guar gum to the mixing tank while stirring. After the addition is complete, stirring is continued for 25 hours to obtain the protective coating.

[0071] The resin base material is prepared as follows: 40 parts by mass of xylene are placed in a reaction vessel, and the temperature is raised to 86°C while stirring. Then, a mixture of 3 parts by mass of methyl methacrylate, 3 parts by mass of hydroxyethyl methacrylate, 0.4 parts by mass of 2,4,6-tris(2-allylphenoxy)-1,3,5-triazine, and 0.012 parts by mass of initiator is added dropwise. The dropwise addition is stopped after 3 hours, and the reaction is continued at the temperature for another 3 hours to obtain the resin base material.

[0072] The initiator includes azoisobutyronitrile.

[0073] The ethylene solution is prepared as follows: Under nitrogen protection, 4 parts by mass of liquid ethylene and 100 parts by mass of diethyl ether are mixed and stirred at 200 rpm for 20 min to obtain an ethylene solution.

[0074] Comparative Example 1

[0075] The difference between Comparative Example 1 and Example 2 is that the protective coating is prepared under nitrogen protection. 40 parts by weight of methyl ethyl ketone are added to a mixing tank and stirred uniformly at a constant temperature of 28°C for 10 minutes. Then, 8 parts by weight of ethyl acetate and 50 parts by weight of resin base are added to the mixing tank while stirring. After the addition is complete, stirring is continued for 24 hours to obtain the protective coating. The steps for the remaining components are the same as in Example 2.

[0076] Comparative Example 2

[0077] The difference between Comparative Example 2 and Example 2 lies in the preparation method of the resin base material as follows: 40 parts by mass of xylene are placed in a reaction vessel, and the temperature is raised to 85°C while stirring. Then, a mixture of 2.5 parts by mass of methyl methacrylate, 2.5 parts by mass of hydroxyethyl methacrylate, and 0.011 parts by mass of initiator is added dropwise. The dropwise addition is completed after 3 hours, and the reaction is continued at the temperature for another 3 hours to obtain the resin base material. The steps for the remaining components are the same as in Example 2.

[0078] Comparative Example 3

[0079] The difference between Comparative Example 3 and Example 2 lies in the preparation method of the reflective cup: Aluminum is vacuum-plated onto the inner wall of a 1mm thick cup base layer to obtain a 300 angstrom aluminum layer; subsequently, a 0.5μm thick protective coating is applied to the aluminum layer, and then it is dried at room temperature to obtain the reflective cup; and the preparation method of the bag is as follows: Aluminum is vacuum-plated onto a 0.02mm thick upper bag base layer to obtain a 400 angstrom aluminum layer; subsequently, a 0.6μm thick protective coating is applied to the aluminum layer, and then it is dried at room temperature to obtain the bag. The remaining component steps are the same as in Example 2.

[0080] Comparative Example 4

[0081] The difference between Comparative Example 4 and Example 2 lies in the structure of the grape protective bag for color change of grape varieties that are difficult to color in hot regions. The packaging bag structure of this comparative example is as follows: A grape protective bag for color change of grape varieties that are difficult to color in hot regions includes a reflective upper bag body and a reflective cup body. The lower end of the reflective upper bag body has an opening that connects to the cup mouth of the reflective cup body. The inner wall of the reflective upper bag body and the inner wall of the reflective cup body form a closed reflective cavity. The reflective upper bag body includes a bag body, which consists of a protective layer, an aluminum-plated layer, and an upper bag body base layer from the inside out. The reflective cup body consists of a protective layer, an aluminum-plated layer, and a cup body base layer from the inside out.

[0082] A connecting unit is provided between the reflective upper bag and the reflective cup. The connecting unit includes an upper support ring coaxially connected to the opening of the reflective upper bag, a lower support ring coaxially connected to the cup opening of the reflective cup, and multiple support rods spaced between the upper and lower support rings and connected to the upper and lower support rings. A waterproof membrane for light transmission and air permeability is provided between adjacent support rods.

[0083] The reflective upper bag is fitted over multiple radial skeletons and a shaping ring. The multiple radial skeletons are connected between the shaping ring and the upper support ring to support the reflective upper bag. The remaining component steps are the same as in Example 2.

[0084] Comparative Example 5

[0085] The difference between Comparative Example 5 and Example 2 lies in the structure of the grape protective bag for color change of grape varieties that are difficult to color in hot regions. The packaging bag structure of this comparative example is as follows: A grape protective bag for color change of grape varieties that are difficult to color in hot regions includes a reflective upper bag body and a reflective cup body. The lower end of the reflective upper bag body has an opening that connects to the cup mouth of the reflective cup body. The inner wall of the reflective upper bag body and the inner wall of the reflective cup body form a closed reflective cavity. The reflective upper bag body includes a bag body and multiple light-transmitting holes arranged near the top of the bag body. The multiple light-transmitting holes are arranged in a ring array and coaxially arranged on the top of the upper bag body to form multiple ring-shaped light-transmitting hole layers. A waterproof film for light transmission and air permeability is installed at the light-transmitting holes. The reflective cup body includes, from the inside out, a protective layer, an aluminum-plated layer, and a cup body base layer. The bag body includes, from the inside out, a protective layer, an aluminum-plated layer, and an upper bag body base layer.

[0086] The reflective upper bag is fitted over multiple radial skeletons and a shaping ring. The multiple radial skeletons are connected between the shaping ring and the cup opening of the reflective cup to support the reflective upper bag. The remaining component steps are the same as in Example 2.

[0087] Comparative Example 6

[0088] Use a standard transparent plastic bag with multiple ventilation holes.

[0089] Comparative Example 7

[0090] It uses a standard paper bag.

[0091] Example of effect

[0092] The experimental site was located at the Mingyang Double-Season Grape Demonstration Base of the Guangxi Zhuang Autonomous Region Academy of Agricultural Sciences. The base has an altitude of 91.7m, a frost-free period of approximately 350 days, an average annual rainfall of 1304mm, an average annual temperature of (22±2)℃, soil organic matter of 18.4g / kg, pH of 5.47, total nitrogen of 1.39g / kg, total phosphorus of 0.69g / kg, and total potassium of 8.79g / kg. The plants were grown in north-south rows with a spacing of 3m × 6m, using a "T"-shaped trellis system in a connected greenhouse. Examples 1-3 were compared with Comparative Example 1. Protective grape bags for ripening of hot-region, difficult-to-color grape varieties were placed on 10 groups of 10 Guipu 15 grape bunches before ripening, with one group of 10 Guipu 15 grape bunches left unprotected as a blank example. Light intensity was measured using a lux meter on the 15th of each month from May to June, requiring simultaneous measurement of light intensity and ground reflection. Data collection time was from 11:00 to 13:00. Soil temperature and relative humidity were measured every 7 days from May to June. At 10:00, soil temperature was measured using a soil thermometer; simultaneously, relative humidity was measured using a wet-bulb and dry-bulb thermometer; color determination: from May 15th to June 26th, samples were taken every 7 days. 180 grapes were randomly selected from 10 groups of grape bunches in Examples 1-3 and Comparative Examples 1-7 (both difficult-to-color grape varieties in hot regions) covered with protective bags for color change, and from the blank example grape bunches; fruit coloring was graded as follows: Grade I, all green, representative value 0; Grade II, 1 / 3 of the fruit is light red, representative value 1; Grade III, 1 / 2 of the fruit is light red, representative value 2; Grade IV, 2 / 3 of the fruit is red, representative value 3; Grade V, all fruit is colored and red, representative value 4; the coloring index was calculated using the following formula: Coloring index = [Σ(number of grapes at each grade × representative value at each grade) / (total number of grapes × highest grade representative value d)] × 100%; the average number of days required for complete color change for each group of grapes was recorded, and the surface morphology of the grapes was observed.

[0093]

[0094]

[0095] As can be seen from the table above, the grape bunches covered with the protective bags for color change of grape varieties that are difficult to color in hot zones prepared in the examples have better color change effects.

[0096] The reason why the fruit coloring grade of Comparative Example 5 was 2 or 4 after color change compared with the Example was that the structure of the grape protective bag for color change of the hot zone difficult-to-color grape variety in Comparative Example 5 was only provided with light-transmitting holes. The grapes near the bottom of the grape protective bag for color change of the hot zone difficult-to-color grape variety dissipated heat slowly, resulting in incomplete color change of the grapes at the bottom of the grape protective bag for color change of the hot zone difficult-to-color grape variety.

[0097] Compared to Example 6, the fruits in Comparative Example 6 were not fully ripe by 20 days. Some fruits were wrinkled and sunken, and the color was uneven, with some red, some green and some yellow. This was because the transparent plastic bag covering the outside of the grape bunch, although it could increase light exposure, could also cause sunburn by exposing the grapes to a high temperature and strong light environment. This is an oxidative damage caused by the combined effects of high temperature and strong light. In addition, since the high temperature affects the absorption of fertilizer by the grapes, the severe sunburn may have caused physiological disorders and delayed the ripening process.

[0098] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A grape protective bag for color change of grape varieties that are difficult to color in hot regions, characterized in that, The device includes a reflective upper bag and a reflective cup. The lower end of the reflective upper bag has an opening that connects to the mouth of the reflective cup. The inner walls of the reflective upper bag and the reflective cup form a closed, reflective cavity. The reflective upper bag includes a bag body and multiple light-transmitting holes near the top of the bag body. A waterproof membrane for light transmission and breathability is installed at the light-transmitting holes. The reflective cup includes, from the inside out, a protective layer, an aluminum-plated layer, and a cup body base layer. The bag body includes, from the inside out, a protective layer, an aluminum-plated layer, and an upper bag body base layer. The bag body is prepared as follows: vacuum aluminum is deposited on the inner layer of the upper bag body base layer with a thickness of 0.01 to 0.02 mm to obtain an aluminum layer with a thickness of 300 to 400 angstroms. Then, a protective coating with a thickness of 0.3 to 0.6 μm is applied on the aluminum layer and then dried at room temperature. Finally, an ethylene solution with a mass of 0.2 to 0.4 times the weight of the protective coating is sprayed to obtain the bag body. The method for preparing the reflective cup body is as follows: vacuum aluminum is deposited on the inner wall of the cup body base with a thickness of 1 mm to obtain an aluminum layer of 300-400 angstroms. Then, a protective coating with a thickness of 0.3-0.6 μm is applied on the aluminum layer and then dried at room temperature. Finally, an ethylene solution with a mass of 0.2-0.4 times that of the protective coating is sprayed to obtain the reflective cup body. The protective coating is prepared by adding 30-50 parts by weight of methyl ethyl ketone to a mixing tank under nitrogen protection, stirring evenly at a constant temperature of 25-30°C for 5-15 minutes, and then sequentially adding 5-10 parts by weight of ethyl acetate, 40-60 parts by weight of resin base, and 2-4 parts by weight of guar gum to the mixing tank while stirring. After the addition is complete, stirring is continued for 23-25 ​​hours to obtain the protective coating. The resin base is prepared as follows: 40 parts by mass of xylene are placed in a reaction vessel, and the temperature is raised to 84-86°C while stirring. Then, a mixture of 2-3 parts by mass of methyl methacrylate, 2-3 parts by mass of hydroxyethyl methacrylate, 0.2-0.4 parts by mass of 2,4,6-tris(2-allylphenoxy)-1,3,5-triazine, and 0.01-0.012 parts by mass of initiator is added dropwise. The dropwise addition is stopped after 3 hours, and the reaction is continued at the temperature for another 3 hours to obtain the resin base. The reflective upper bag is fitted over multiple radial skeletons and a shaping ring. The multiple radial skeletons are connected between the shaping ring and the upper support ring to support the reflective upper bag.

2. The grape protective bag for color change of grape varieties that are difficult to color in hot regions according to claim 1, characterized in that, A connecting unit is provided between the reflective upper bag and the reflective cup. The connecting unit includes an upper support ring coaxially connected to the opening of the reflective upper bag, a lower support ring coaxially connected to the cup opening of the reflective cup, and multiple support rods spaced between the upper and lower support rings and connected to the upper and lower support rings. A waterproof membrane for light transmission and air permeability is provided between adjacent support rods.

3. The grape protective bag for color change of grape varieties that are difficult to color in hot regions according to claim 1, characterized in that, The multiple light-transmitting holes are arranged in a ring array coaxially at the top near the upper bag body.

4. The grape protective bag for color change of grape varieties that are difficult to color in hot regions according to claim 1, characterized in that, The ethylene solution is prepared as follows: Under nitrogen protection, 2-4 parts by mass of liquid ethylene and 100 parts by mass of diethyl ether are mixed and stirred at 100-200 rpm for 10-20 min to obtain the ethylene solution.

5. A method of using a grape protective bag for color change of hot-zone, difficult-to-color grape varieties according to any one of claims 1 to 3, characterized in that, Place the grape protective bag for color change of the hot zone difficult-to-color grape variety on the outside of the grape bunch before color change, and then tighten the reflective upper bag body at the top of the shaping ring.

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