Grape protection bag for coloring of grape variety difficult to color in hot area and use method of grape protection bag

Abstract

The invention discloses a grape protection bag for coloring 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 comprises a reflective upper bag body and a reflective cup body, an opening is formed in the lower end of the reflective upper bag body and connected with a cup opening of the reflective cup body, and a closed reflective containing cavity is defined by the inner wall of the reflective upper bag body and the inner wall of the reflective cup body; a plurality of light-transmitting holes are formed in the top of the reflective upper bag body, and waterproof films for transmitting light and ventilating are arranged at the light-transmitting holes; the reflection cup body sequentially comprises a protection layer, an aluminum plating layer and a cup body base layer from inside to outside. And the reflective upper bag body sequentially comprises a protective layer, an aluminized layer and an upper bag body base layer from inside to outside.

Description

Technical Field

[0001] The invention relates to the technical field of grape planting, in particular to a grape protection bag for color change of a grape variety that is difficult to color in hot areas and a use method thereof. Background Art

[0002] In tropical and subtropical regions, due to the unique climatic conditions, grapes sprout early, and the growth cycle is often accompanied by hot and humid conditions. Although higher temperatures are conducive to fruit ripening, the light in these areas is not always sufficient. Especially in southern my country, the color change period is mostly from late May to the end of June. During this period, the frequent summer rainfall, high temperature, high humidity and insufficient light seriously affect the normal coloring process of those grape varieties with high light requirements, and may even cause the grapes to be completely unable to color; then, because grape cultivation mostly adopts the facility cultivation mode, although this effectively reduces the diseases caused by rain, the film used in facility cultivation also blocks part of the natural light and reduces ventilation, which further weakens the light intensity received by the grapes during the color change period, and the ventilation becomes worse, which further affects the color change of the grapes; and during this period, the environment under the grape leaf canopy is not only high in temperature and poor in ventilation, but also extremely unfavorable in light conditions, which again affects the color change of the grapes.

[0003] And in the actual production process, in order to prevent damage to grapes caused by pests and diseases, grapes usually need to be bagged, especially in the southern region. However, the traditional bagging method will further reduce the light intensity received by the fruit surface, which is undoubtedly a challenge for those grape varieties that are not easy to color. In addition, if bags are made of transparent materials, due to poor air permeability, it is possible that the temperature of the grape skin will rise sharply due to direct sunlight, resulting in high temperature burns, so it is not easy to use in southern grape production. The so-called "high temperature coloring barrier" is formed in a high temperature and high humidity environment, affecting the coloring effect of red (black) grape varieties.

[0004] In view of the above situation, it is particularly important to design a grape protection bag that can both reduce temperature and enhance light. The ideal grape protection bag should have good light transmission performance, be able to guide light into the bag and ensure that the whole bunch of grapes can evenly receive enough light through a special reflective design, so as to promote the coloring of the grapes. In addition, the appropriate openings on the bag body can not only achieve light transmission, but also have a ventilation function, which helps to reduce the temperature of the fruit surface, thereby creating a microenvironment that is more suitable for grape coloring. Summary of the invention

[0005] The purpose of the present invention is to provide a grape protection bag for color change of grape varieties that are difficult to color in hot areas and a method of using the same, so as to solve the technical problems mentioned in the above background technology.

[0006] The technical solution for achieving the purpose of the present invention is:

[0007] A grape protection bag for color change of grape varieties that are difficult to color in hot areas, comprising a reflective upper bag body and a reflective cup body, wherein the lower end of the reflective upper bag body is provided with an opening, the opening is connected to the cup mouth 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 reflective accommodating cavity; the reflective upper bag body comprises a bag body and a plurality of light-transmitting holes arranged near the top of the bag body, wherein waterproof films for light transmission and air permeability are arranged at the light-transmitting holes; the reflective cup body comprises a protective layer, an aluminum-plated layer, and a cup body base layer from the inside to the outside in sequence; and the bag body comprises a protective layer, an aluminum-plated layer, and an upper bag body base layer from the inside to the outside in sequence.

[0008] Furthermore, a connecting unit is provided between the reflective upper bag body and the reflective cup body, and 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 connected to the upper support ring and the lower support ring at intervals arranged between the upper support ring and the lower support ring, and a waterproof film for light transmission and air permeability is provided between adjacent support rods.

[0009] Furthermore, the reflective upper bag body is sleeved on the outside of a plurality of radial frames and a shaping ring, and the plurality of radial frames are connected between the shaping ring and the upper supporting ring to support the reflective upper bag body.

[0010] Furthermore, the plurality of light-transmitting holes in an annular array are coaxially arranged near the top of the upper bag body, so as to facilitate direct light emission from the light-transmitting holes into the accommodating cavity.

[0011] Furthermore, the preparation method of the bag body is as follows: vacuum aluminum is plated on a 0.01-0.02 mm thick upper bag body base to obtain a 300-400 angstrom aluminum layer, then a 0.3-0.6 μm thick protective layer coating is coated on the aluminum layer and then dried at room temperature, and then an ethylene solution of 0.2-0.4 times the mass of the protective layer coating is sprayed to obtain a bag body.

[0012] Furthermore, the preparation method of the reflective cup body is as follows: vacuum aluminum is plated on the inner wall of the 1 mm thick cup body base to obtain a 300 to 400 angstrom aluminum layer, then a 0.3 to 0.6 μm thick protective layer coating is coated on the aluminum layer and then dried at room temperature, and then an ethylene solution of 0.2 to 0.4 times the mass of the protective layer coating is sprayed to obtain a reflective cup body.

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

[0014] Furthermore, the protective layer coating is prepared by adding 30 to 50 parts by mass of butanone into a stirring barrel under nitrogen protection conditions, stirring evenly for 5 to 15 minutes at a constant temperature of 25 to 30° C., and then sequentially adding 5 to 10 parts by mass of ethyl acetate, 40 to 60 parts by mass of a resin base material, and 2 to 4 parts by mass of guar gum into the stirring barrel while stirring, and continuously stirring for 23 to 25 hours after the addition is completed to obtain the protective layer coating.

[0015] Furthermore, the preparation method of the resin base material is as follows: 40 parts by mass of xylene are put into a reaction kettle, the temperature is raised to 84-86°C while stirring, and then 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 an initiator are added dropwise, the addition is terminated after 3 hours, and the reaction is kept warm for 3 hours to obtain the resin base material.

[0016] Furthermore, the initiator includes azoisobutyronitrile.

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

[0018] The invention discloses a method for using a grape protection bag for color change of a grape variety that is difficult to color in a hot zone. The grape protection bag for color change of a grape variety that is difficult to color in a hot zone is put on the outside of a grape bunch before color change, and then a reflective upper bag body on the upper part of a shaping ring is tightened.

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

[0020] (1) The grape protection bag for the color change of grape varieties that are difficult to color in hot zones of the present invention 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, 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 and reflective containing cavity. The reflective upper bag body comprises a bag body and a plurality of light-transmitting holes arranged near the top of the bag body, and a waterproof film for light transmission and air permeability is installed at the light-transmitting holes. The containing cavity is used to place grape bunches. Natural light enters the inner containing cavity of the grape protection bag for the color change of grape varieties that are difficult to color in hot zones through the light-transmitting holes, and is reflected by the inner wall of the reflective upper bag body and the inner wall of the reflective cup body, so that the light is evenly irradiated on the grape bunches, thereby increasing the light intensity of each part of the grape bunches. At the same time, it can avoid direct sunlight on conventional transparent fruit bags, which may cause the grape skin temperature to rise sharply. In addition, the ventilation and air permeability of transparent fruit bags are poor, which can easily cause high-temperature burns, affecting the coloring progress of difficult-to-color grape varieties or even causing the problem of no coloring, thereby improving the quality of grapes, promoting the accumulation of grape anthocyanins and accelerating the color change process. At the same time, the light-transmitting holes adopt a waterproof film with light-transmitting and air-permeable properties, which can not only ensure that light can smoothly enter the containing cavity for irradiation, but also ensure that the flowing air can freely enter and exit the containing cavity and take away the temperature in the containing cavity. Compared with the traditional openings in grape protection bags, the waterproof film with light-transmitting and air-permeable properties is set on the air holes to avoid the influence of dust, mold, pesticides, etc. on the fruit bunches to a great extent, and 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 permeability is provided between adjacent support rods. A second light-transmitting and air-permeable area is formed on the grape protection bag for the color change of 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-permeable area and the light-transmitting opening of the reflective upper bag body, thereby preventing air from flowing only above the reflective upper bag body. The fluidity of air in the grape protection bag for the color change of grape varieties that are difficult to color in hot areas is increased, and the temperature in the accommodation chamber can be better taken away, so that the temperature in the accommodation chamber is uniform, thereby preventing high temperature from being concentrated in the reflective cup body and hindering 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 frames and shaping rings, and these radial frames are connected to the shaping ring and the upper supporting ring to jointly support the reflective upper bag body.

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

[0024] (4) When preparing the reflective cup body of the present invention, the inner wall of the cup body base is vacuum-plated with aluminum, coated with a protective coating, and sprayed with an 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 cause changes in the color of the 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, a resin base material, and guar gum, wherein the resin base material with a hyperbranched structure is obtained by copolymerizing methyl methacrylate, hydroxyethyl methacrylate, and 2,4,6-tris(2-allylphenoxy)-1,3,5-triazine, and a cavity is formed in the resin base material. The inner wall of the cavity contains active groups such as hydroxyl groups, which can effectively absorb ethylene solution in combination with guar gum, and slowly release ethylene, thereby further promoting the color change of the fruit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein

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

[0028] The numbers in the accompanying drawings are: 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 2-1, protective layer 2-2, aluminum plating layer 2-3, connecting unit 3, upper support ring 3-1, lower support ring 3-2, support rod 3-3. DETAILED DESCRIPTION

[0029] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the embodiments of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when used, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The present invention is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the scope of protection of the present invention.

[0035] (Overall Embodiment)

[0036] See Figure 1 A grape protection bag for color change of grape varieties that are difficult to color in hot areas, comprising a reflective upper bag body and a reflective cup body, wherein the lower end of the reflective upper bag body is provided with an opening, the opening is connected to the cup mouth of the reflective cup body, and the inner wall of the reflective upper bag body and the inner wall of the reflective cup body form a closed reflective accommodating cavity; the reflective upper bag body comprises a bag body, and a plurality of light-transmitting holes arranged near the top of the bag body, a plurality of light-transmitting hole annular arrays are coaxially arranged on the top of the upper bag body to form a plurality of annular light-transmitting hole layers, and a waterproof film for light transmission and air permeability is installed at the light-transmitting holes; the reflective cup body comprises a protective layer, an aluminum-plated layer, and a cup body base layer from the inside to the outside; the bag body comprises a protective layer, an aluminum-plated layer, and an upper bag body base layer from the inside to the outside.

[0037] A connecting unit is provided between the reflective upper bag body and the reflective cup body, and the connecting unit includes an upper supporting ring coaxially connected to the opening of the reflective upper bag body, a lower supporting ring coaxially connected to the cup mouth of the reflective cup body, and a plurality of supporting rods spaced apart between the upper supporting ring and the lower supporting ring and connected to the upper supporting ring and the lower supporting ring, and waterproof films for light transmission and air permeability are provided between adjacent supporting rods.

[0038] The reflective upper bag body is sleeved on the outside of a plurality of radial frames and a shaping ring, and the plurality of radial frames are connected between the shaping ring and the upper supporting ring to support the reflective upper bag body.

[0039] The preparation method of the bag body is as follows: vacuum aluminum is plated on a 0.01-0.02 mm thick upper bag body base to obtain a 300-400 angstrom aluminum layer, then a 0.3-0.6 μm thick protective layer coating is coated on the aluminum layer and then dried at room temperature, and then an ethylene solution of 0.2-0.4 times the mass of the protective layer coating is sprayed to obtain the bag body.

[0040] The upper bag base and the waterproof film used for light transmission and air permeability are made of transparent waterproof PU film from Wuhan Huawei Technology Co., Ltd. The transparent waterproof PU film has high transparency, good waterproofness and air permeability, and the air permeability is 1000-3000g / m 2 .24h, and has good transparent, light-transmitting, breathable and waterproof properties.

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

[0042] The cup body base material is PMMA.

[0043] The protective layer coating is prepared by adding 30 to 50 parts by weight of butanone into a stirring barrel under nitrogen protection, uniformly stirring at a constant temperature of 25 to 30° C. for 5 to 15 minutes, and then sequentially adding 5 to 10 parts by weight of ethyl acetate, 40 to 60 parts by weight of a resin base material, and 2 to 4 parts by weight of guar gum into the stirring barrel while stirring, and continuously stirring for 23 to 25 hours after the addition is completed, to obtain the protective layer coating.

[0044] The preparation method of the resin base material is as follows: 40 parts by weight of xylene is put into a reaction kettle, and the temperature is raised to 84-86° C. while stirring, and then a mixture of 2-3 parts by weight of methyl methacrylate, 2-3 parts by weight of hydroxyethyl methacrylate, 0.2-0.4 parts by weight of 2,4,6-tris(2-allylphenoxy)-1,3,5-triazine, and 0.01-0.012 parts by weight of an initiator is added dropwise, and the addition is terminated after 3 hours, and the reaction is kept warm for 3 hours to obtain the resin base material.

[0045] The initiator includes azoisobutyronitrile.

[0046] The preparation method of the ethylene solution is as follows: under nitrogen protection, 2 to 4 parts by mass of liquid ethylene and 100 parts by mass of ether are mixed, and stirred at 100 to 200 rpm for 10 to 20 minutes to obtain an ethylene solution.

[0047] (Example 1)

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

[0049] The upper bag base and the waterproof film used for light transmission and air permeability are made of transparent waterproof PU film from Wuhan Huawei Technology Co., Ltd. The transparent waterproof PU film has high transparency, good waterproofness and air permeability, and the air permeability is 1000-3000g / m 2 .24h, and has good transparent, light-transmitting, breathable and waterproof properties.

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

[0051] The cup body base material is PMMA.

[0052] The protective layer coating is prepared by adding 30 parts by mass of butanone into a stirring barrel under nitrogen protection, stirring evenly for 5 minutes at a constant temperature of 25° C., and then sequentially adding 5 parts by mass of ethyl acetate, 40 parts by mass of a resin base material, and 2 parts by mass of guar gum into the stirring barrel while stirring. After the addition is completed, stirring is continued for 23 hours to obtain the protective layer coating.

[0053] The preparation method of the resin base material is as follows: 40 parts by mass of xylene are put into a reaction kettle, and the temperature is raised to 84° C. while stirring, and 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 an initiator is added dropwise, and the addition is stopped after 3 hours, and the reaction is kept warm for 3 hours to obtain the resin base material.

[0054] The initiator includes azoisobutyronitrile.

[0055] The preparation method of the ethylene solution is as follows: under nitrogen protection, 2 parts by mass of liquid ethylene and 100 parts by mass of ether are mixed, and stirred at 100 rpm for 10 minutes to obtain an ethylene solution.

[0056] (Example 2)

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

[0058] The upper bag base and the waterproof film used for light transmission and air permeability are made of transparent waterproof PU film from Wuhan Huawei Technology Co., Ltd. The transparent waterproof PU film has high transparency, good waterproofness and air permeability, and the air permeability is 1000-3000g / m 2 .24h, and has good transparent, light-transmitting, breathable and waterproof properties.

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

[0060] The cup body base material is PMMA.

[0061] The protective layer coating is prepared by adding 40 parts by mass of butanone into a stirring barrel under nitrogen protection, stirring evenly for 10 minutes at a constant temperature of 28° C., and then sequentially adding 8 parts by mass of ethyl acetate, 50 parts by mass of a resin base material, and 3 parts by mass of guar gum into the stirring barrel while stirring. After the addition is completed, stirring is continued for 24 hours to obtain the protective layer coating.

[0062] The preparation method of the resin base material is as follows: 40 parts by mass of xylene are put into a reaction kettle, and the temperature is raised to 85° C. while stirring, and 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 an initiator is added dropwise, and the addition is stopped after 3 hours, and the reaction is kept warm for 3 hours to obtain the resin base material.

[0063] The initiator includes azoisobutyronitrile.

[0064] The preparation method of the ethylene solution is as follows: under nitrogen protection, 3 parts by mass of liquid ethylene and 100 parts by mass of ether are mixed, and stirred at 150 rpm for 15 minutes to obtain an ethylene solution.

[0065] (Example 3)

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

[0067] The upper bag base and the waterproof film used for light transmission and air permeability are made of transparent waterproof PU film from Wuhan Huawei Technology Co., Ltd. The transparent waterproof PU film has high transparency, good waterproofness and air permeability, and the air permeability is 1000-3000g / m 2 .24h, and has good transparent, light-transmitting, breathable and waterproof properties.

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

[0069] The cup body base material is PMMA.

[0070] The protective layer coating is prepared by adding 50 parts by mass of butanone into a stirring barrel under nitrogen protection, stirring evenly for 15 minutes at a constant temperature of 30° C., and then sequentially adding 10 parts by mass of ethyl acetate, 60 parts by mass of a resin base material, and 4 parts by mass of guar gum into the stirring barrel while stirring. After the addition is completed, stirring is continued for 25 hours to obtain the protective layer coating.

[0071] The preparation method of the resin base material is as follows: 40 parts by mass of xylene are put into a reaction kettle, and the temperature is raised to 86° C. while stirring, and 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 an initiator is added dropwise, and the addition is stopped after 3 hours, and the reaction is kept warm for 3 hours to obtain the resin base material.

[0072] The initiator includes azoisobutyronitrile.

[0073] The preparation method of the ethylene solution is as follows: under nitrogen protection, 4 parts by mass of liquid ethylene and 100 parts by mass of ether are mixed, and stirred at 200 rpm for 20 minutes to obtain an ethylene solution.

[0074] Comparative Example 1

[0075] The difference between Comparative Example 1 and Example 2 is that the protective layer coating is prepared under nitrogen protection, 40 parts by mass of butanone are added to a stirring barrel, and stirred evenly at a constant temperature of 28°C for 10 minutes, and then 8 parts by mass of ethyl acetate and 50 parts by mass of resin base material are added to the stirring barrel in sequence, stirring while adding, and stirring is continued for 24 hours after the addition to obtain the protective layer coating; the remaining components and steps are the same as those in Example 2.

[0076] Comparative Example 2

[0077] The difference between Comparative Example 2 and Example 2 is that the preparation method of the resin base material is as follows: 40 parts by mass of xylene are put into a reaction kettle, the temperature is raised to 85°C while stirring, and 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 are added dropwise. The addition is stopped after 3 hours, and the reaction is kept warm for 3 hours to obtain a resin base material; the remaining components and steps are the same as those in Example 2.

[0078] Comparative Example 3

[0079] The difference between Comparative Example 3 and Example 2 is that the preparation method of the reflective cup body is as follows: vacuum aluminum is plated on the inner wall of the 1mm thick cup body base to obtain a 300 angstrom aluminum layer, and then a 0.5μm thick protective layer coating is coated on the aluminum layer and then dried at room temperature to obtain a reflective cup body; and the preparation method of the bag body is as follows: vacuum aluminum is plated on the 0.02mm thick upper bag body base to obtain a 400 angstrom aluminum layer, and then a 0.6μm thick protective layer coating is coated on the aluminum layer and then dried at room temperature to obtain a bag body. The remaining components and steps are the same as those of Example 2.

[0080] Comparative Example 4

[0081] The difference between Comparative Example 4 and Example 2 lies in the structure of the grape protection bag for the color change of grape varieties that are difficult to color in hot zones. The packaging bag structure of this comparative example is as follows: a grape protection bag for the color change of grape varieties that are difficult to color in hot zones, comprising a reflective upper bag body and a reflective cup body, wherein the lower end of the reflective upper bag body is provided with an opening, which is connected to the cup mouth of the reflective cup body, and the inner wall of the reflective upper bag body and the inner wall of the reflective cup body form a closed reflective accommodating cavity; the reflective upper bag body comprises a bag body, which comprises a protective layer, an aluminum-plated layer, and an upper bag body base layer from the inside to the outside; the reflective cup body comprises a protective layer, an aluminum-plated layer, and a cup body base layer from the inside to the outside.

[0082] A connecting unit is provided between the reflective upper bag body and the reflective cup body, and the connecting unit includes an upper supporting ring coaxially connected to the opening of the reflective upper bag body, a lower supporting ring coaxially connected to the cup mouth of the reflective cup body, and a plurality of supporting rods spaced apart between the upper supporting ring and the lower supporting ring and connected to the upper supporting ring and the lower supporting ring, and waterproof films for light transmission and air permeability are provided between adjacent supporting rods.

[0083] The reflective upper bag body is sleeved on the outside of multiple radial skeletons and the shaping ring, and the multiple radial skeletons are connected between the shaping ring and the upper supporting ring to support the reflective upper bag body; the remaining components and steps are the same as those in Example 2.

[0084] Comparative Example 5

[0085] The difference between Comparative Example 5 and Example 2 lies in the structure of the grape protection bag for the color change of grape varieties that are difficult to color in hot zones. The packaging bag structure of this comparative example is as follows: a grape protection bag for the color change of grape varieties that are difficult to color in hot zones, comprising a reflective upper bag body and a reflective cup body, wherein the lower end of the reflective upper bag body is provided with an opening, which is connected to the cup mouth of the reflective cup body, and the inner wall of the reflective upper bag body and the inner wall of the reflective cup body form a closed reflective accommodating cavity; the reflective upper bag body comprises a bag body, and a plurality of light-transmitting holes arranged near the top of the bag body, and a plurality of light-transmitting hole annular arrays are coaxially arranged on the top of the upper bag body to form a plurality of annular light-transmitting hole layers, and a waterproof film for light transmission and air permeability is installed at the light-transmitting holes; the reflective cup body comprises a protective layer, an aluminum-plated layer, and a cup body base layer from the inside to the outside; the bag body comprises a protective layer, an aluminum-plated layer, and an upper bag body base layer from the inside to the outside.

[0086] The reflective upper bag body is sleeved on the outside of multiple radial frames and the shaping ring, and the multiple radial frames are connected between the shaping ring and the mouth of the reflective cup body to support the reflective upper bag body; the remaining components and steps are the same as those in Example 2.

[0087] Comparative Example 6

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

[0089] Comparative Example 7

[0090] Use conventional paper bagging.

[0091] Effect example

[0092] The test site is located at the Mingyang Double Season Grape Demonstration Base of Guangxi Academy of Agricultural Sciences, with an altitude of 91.7m, a frost-free period of about 350d throughout the year, an average annual precipitation of 1304mm, an average annual temperature of (22±2)°C, soil organic matter of 18.4g / kg, pH value of 5.47, total nitrogen of 1.39g / kg, total phosphorus of 0.69g / kg, and total potassium of 8.79g / kg; north-south direction, plant spacing of 3m×6m, "T"-shaped frame, multi-span greenhouse cultivation; Examples 1 to 3 and Comparative Example 1 are compared. Grape protection bags for the color change of grape varieties that are difficult to color in hot zones from May to June were placed on 10 groups of 10 grape bunches of Guipu No. 15 before the color change period, and one group of 10 grape bunches of Guipu No. 15 were set up without grape protection bags for the color change of grape varieties that are difficult to color in hot zones as a blank case; light intensity was measured on the 15th of each month from May to June using a illuminometer, requiring both light intensity and surface reflected light to be measured, with data collected from 11:00 to 13:00; soil temperature and relative air humidity were measured: from May to June, every 7 days At 10:00, the soil temperature was measured using a soil thermometer; at the same time, the relative humidity of the air was measured using a dry-bulb thermometer; chromaticity determination: from May 15 to June 26, sampling was performed once every 7 days, and 180 grapes were randomly selected from 10 groups of grape clusters respectively covered with grape protection bags for the hot zone difficult-to-color grape varieties of Examples 1 to 3 and Comparative Examples 1 to 7 and the grape clusters of the blank example; fruit coloring was graded according to the following method: Grade I, the fruit was all green, with a representative value of 0; Grade II, 1 / 3 of the fruit was light red, with a representative value of 1; Grade III, 1 / 2 of the fruit was light red, with a representative value of 2; Grade IV, 2 / 3 of the fruit was red, with a representative value of 3; Grade V, the fruit was completely colored and red, with a representative value of 4; the coloring index was calculated according to the following formula: Coloring index = [Σ (number of fruit grains at each level × representative value of each level) / (total number of grains × highest level representative value d)] × 100%; and the average number of days required for each group of grapes to completely change color was recorded and the surface morphology of the grapes was observed.

[0093]

[0094]

[0095] It can be seen from the above table that the grape bunches covered with the grape protection bag for color change of hot zone difficult-to-color grape varieties prepared in the embodiment have a better color change effect.

[0096] The reason why the coloring level of the fruit in Comparative Example 5 after the color change is completed is 2 or 4 compared with that in the embodiment is that the structure of the grape protection bag for color change of grape varieties difficult to color in hot zones in Comparative Example 5 is only provided with light-transmitting holes, and the grape fruits near the bottom of the grape protection bag for color change of grape varieties difficult to color in hot zones dissipate heat slowly, resulting in incomplete color change of the grape fruits at the bottom of the grape protection bag for color change of grape varieties difficult to color in hot zones.

[0097] Comparative Example 6 is compared with Example 6. The fruit is not fully mature on the 20th day, and some fruits are wrinkled and sunken, and the color is uneven, with red, green and yellow. This is because the transparent plastic bag covering the outside of the fruit cluster can increase the light, but it can also cause sunburn when the grape fruit is exposed to a high temperature and strong light environment. This is an oxidative damage caused by the combined action of high temperature and strong light. In addition, since high temperature affects the absorption of fertilizers by grapes, severe burns may lead to physiological disorders and delay the ripening process.

[0098] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is 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 in the protection scope of the present invention.

Claims

1. A grape protection bag for color change of grape varieties that are difficult to color in hot areas, characterized in that: The reflective upper bag body comprises a reflective cup body, wherein the lower end of the reflective upper bag body is provided with an opening connected to the cup mouth 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 reflective accommodating cavity; the reflective upper bag body comprises a bag body and a plurality of light-transmitting holes arranged near the top of the bag body, wherein waterproof films for light transmission and air permeability are arranged at the light-transmitting holes; the reflective cup body comprises a protective layer, an aluminum-plated layer, and a cup body base layer from the inside to the outside in sequence; the bag body comprises a protective layer, an aluminum-plated layer, and an upper bag body base layer from the inside to the outside in sequence.

2. The grape protection bag for color change of hot zone difficult-to-color grape varieties according to claim 1, characterized in that: A connecting unit is provided between the reflective upper bag body and the reflective cup body, and the connecting unit includes an upper supporting ring coaxially connected to the opening of the reflective upper bag body, a lower supporting ring coaxially connected to the cup mouth of the reflective cup body, and a plurality of supporting rods spaced apart between the upper supporting ring and the lower supporting ring and connected to the upper supporting ring and the lower supporting ring, and waterproof films for light transmission and air permeability are provided between adjacent supporting rods.

3. The grape protection bag for color change of grape varieties difficult to color in hot areas according to claim 2, characterized in that: The reflective upper bag body is sleeved on the outside of a plurality of radial frames and a shaping ring, and the plurality of radial frames are connected between the shaping ring and the upper supporting ring to support the reflective upper bag body.

4. The grape protection bag for color change of hot zone difficult-to-color grape varieties according to claim 1, characterized in that: The plurality of light-transmitting hole annular arrays are coaxially arranged near the top of the upper bag body.

5. The grape protection bag for color change of hot zone difficult-to-color grape varieties according to claim 1, characterized in that: The preparation method of the bag body is as follows: vacuum aluminum is plated on the inner layer of the upper bag body base with a thickness of 0.01 to 0.02 mm to obtain an aluminum-plated layer of 300 to 400 angstroms, and then a protective layer coating with a thickness of 0.3 to 0.6 μm is coated on the aluminum-plated layer and then dried at room temperature, and then an ethylene solution with a weight of 0.2 to 0.4 times the weight of the protective layer coating is sprayed to obtain the bag body.

6. The grape protection bag for color change of grape varieties difficult to color in hot areas according to claim 1, characterized in that: The preparation method of the reflective cup body is as follows: vacuum aluminum is plated on the inner wall of a 1 mm thick cup body base to obtain an aluminum layer of 300 to 400 angstroms, then a protective layer of 0.3 to 0.6 μm thick is coated on the aluminum layer and then dried at room temperature, and then an ethylene solution of 0.2 to 0.4 times the mass of the protective layer is sprayed to obtain a reflective cup body.

7. The grape protection bag for color change of hot zone difficult-to-color grape varieties according to claim 5 or 6, characterized in that: The protective layer coating is prepared by adding 30 to 50 parts by weight of butanone into a stirring barrel under nitrogen protection, uniformly stirring at a constant temperature of 25 to 30° C. for 5 to 15 minutes, and then sequentially adding 5 to 10 parts by weight of ethyl acetate, 40 to 60 parts by weight of a resin base material, and 2 to 4 parts by weight of guar gum into the stirring barrel while stirring, and continuously stirring for 23 to 25 hours after the addition is completed, to obtain the protective layer coating.

8. The grape protection bag for color change of hot zone difficult-to-color grape varieties according to claim 7, characterized in that: The preparation method of the resin base material is as follows: 40 parts by weight of xylene is put into a reaction kettle, and the temperature is raised to 84-86° C. while stirring, and then a mixture of 2-3 parts by weight of methyl methacrylate, 2-3 parts by weight of hydroxyethyl methacrylate, 0.2-0.4 parts by weight of 2,4,6-tris(2-allylphenoxy)-1,3,5-triazine, and 0.01-0.012 parts by weight of an initiator is added dropwise, and the addition is terminated after 3 hours, and the reaction is kept warm for 3 hours to obtain the resin base material.

9. The grape protection bag for color change of grape varieties difficult to color in hot areas according to claim 6, characterized in that: The preparation method of the ethylene solution is as follows: under nitrogen protection, 2 to 4 parts by mass of liquid ethylene and 100 parts by mass of ether are mixed, and stirred at 100 to 200 rpm for 10 to 20 minutes to obtain an ethylene solution.

10. A method for using the grape protection bag for color change of hot zone difficult-to-color grape varieties according to any one of claims 1 to 4, characterized in that: The grape protection bag for color change of the hot zone difficult-to-color grape variety is put on the outside of the grape bunch before color change, and then the reflective upper bag body on the top of the shaping ring is tightened.

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