A kind of air column bag with strong degradation ability and preparation method thereof

Abstract

The present application relates to the field of packaging materials, and specifically discloses an air column bag with strong degradation ability and a preparation method thereof. The air column bag with strong degradation ability is made of degradable plastic, and the degradable plastic is composed of the following raw materials in parts by weight: 100-140 parts of polylactic acid, 6-10 parts of polyvinyl alcohol, 3-5 parts of nucleating agent, 1-3 parts of coupling agent, 1-3 parts of plasticizer, 1-1.4 parts of photocatalyst, and 7-11 parts of auxiliary components, wherein the auxiliary components include nutritional components, decomposition components that promote the decomposition of nutritional components, and toughening components, and the weight ratio of the nutritional components, decomposition components, and toughening components is (3-5): (2-4): 2. The air column bag with strong degradation ability of the present application can be used for packaging of articles, and it has the advantage of strong degradation ability.

Description

Technical Field

[0001] The present application relates to the field of novel packaging materials, and more specifically, to an air column bag with strong degradation ability and a preparation method thereof. Background Art

[0002] Air column bags are new packaging materials filled with natural air. Through comprehensive air column cushioning protection, the loss rate of products during transportation is reduced to a minimum. Air column bags have a wide range of applications and are a substitute for EPE, EPS and paper plastic. Air column bags can be used for any product that is related to packaging and needs to be transported.

[0003] In order to reduce the pollution of plastic to the environment, compostable and degradable plastic is used to make air column bags. The discarded air column bags will disintegrate and degrade due to the biological reaction process under composting conditions.

[0004] During the composting process, the temperature and humidity of the outer layer of the compost are lower than those of the inner layer, so the degradation rate of the outer layer is also lower than that of the inner layer. In order to increase the degradation rate of the outer layer, the compost needs to be turned over multiple times, which increases the labor intensity of the workers. Summary of the invention

[0005] In order to increase the degradation rate of air column bag plastic and reduce the labor intensity of workers, the present application provides an air column bag with strong degradation ability and a preparation method thereof.

[0006] In the first aspect, the present application provides an air column bag with strong degradation ability, which adopts the following technical solution:

[0007] The invention discloses an air column bag with strong degradation ability, which is made of degradable plastic. The degradable plastic is composed of the following raw materials in parts by weight: 100-140 parts of polylactic acid, 6-10 parts of polyvinyl alcohol, 3-5 parts of nucleating agent, 1-3 parts of coupling agent, 1-3 parts of plasticizer, 1-1.4 parts of photocatalyst, and 7-11 parts of auxiliary components. The auxiliary components include nutritional components, decomposition components for promoting decomposition of the nutritional components, and toughening components. The weight ratio of the nutritional components, the decomposition components, and the toughening components is (3-5):(2-4):2.

[0008] By adopting the above technical scheme, the toughening component is used to improve the connection stability of the nutritional component and the decomposition component within the whole, and the overall strength reduction caused by the addition of the nutritional component and the decomposition component is reduced. When the compost is decomposed, the nutritional component is more suitable for microbial absorption after being decomposed by the decomposition component, thereby effectively promoting the reproduction of microorganisms, and then decomposing the toughening component, effectively improving the degradation rate of the plastic, reducing the number of times workers turn the compost, and reducing the labor intensity of workers.

[0009] Preferably, the nutritional component is bee pollen, and the bee pollen is crushed to a particle size of 800 meshes.

[0010] By adopting the above technical solution, bee pollen is crushed and used as a nutrient to synthesize plastics. When the compost decomposes, the decomposition components decompose the bee pollen, thereby breaking it down into nutrients that are more easily absorbed. The nutrients promote the reproduction of microorganisms. As the number of microorganisms increases, the decomposition efficiency of plastics is significantly improved, thereby accelerating the degradation efficiency of plastics.

[0011] Preferably, the decomposition component is hydroxypropyl-β-cyclodextrin.

[0012] By adopting the above technical solution, hydroxypropyl-β-cyclodextrin has a certain hygroscopicity, so that the plastic in the composting degradation process is more suitable for the growth environment of microorganisms, and bee pollen is also easier to decompose into nutrients. Hydroxypropyl-β-cyclodextrin has a stabilizing effect on nutrients, reducing the loss of nutrients due to denaturation and other reasons, so that more nutrients are retained for microbial absorption.

[0013] Preferably, the toughening component is silk fiber, and the weight ratio of the bee pollen, hydroxypropyl-β-cyclodextrin and silk fiber is 4:3:2.

[0014] By adopting the above technical solution, silk fibers play a toughening role, reducing the impact of bee pollen and hydroxypropyl-β-cyclodextrin on plastic performance. At the same time, during the composting degradation process, silk fibers can also be decomposed into nutrients such as amino acids, which are further absorbed and decomposed by microorganisms, thereby promoting microbial reproduction.

[0015] Preferably, the nucleating agent is α-cyclodextrin.

[0016] By adopting the above technical solution, α-cyclodextrin is a ring-structured oligosaccharide with a conical molecular structure. It is hydrophilic on the outside and hydrophobic on the inside and has the characteristics of an enzyme model. While acting as a nucleating agent, it can also play a certain catalytic degradation role.

[0017] Preferably, the weight ratio of the nucleating agent to the nutritional components is 1:1.

[0018] By adopting the above technical solution, both α-cyclodextrin and hydroxypropyl-β-cyclodextrin can promote plastic nucleation, thereby reducing the area of ​​amorphous regions, increasing the overall density, and thereby effectively improving the strength of plastics.

[0019] Preferably, 1 to 1.4 parts of a photocatalyst are also included.

[0020] By adopting the above technical solution, photocatalysis is first used to carry out the first step of degradation of degradable plastics, and some large molecules of degradable plastics are decomposed into small molecules, thereby reducing the difficulty of composting degradation, being more conducive to the degradation of degradable plastics by microorganisms, and increasing the degradation rate.

[0021] Preferably, the method for preparing the degradable plastic comprises the following steps: drying polylactic acid and polyvinyl alcohol and mixing them with other raw materials, and then extruding and granulating them to form degradable plastic masterbatch.

[0022] By adopting the above technical solution, polylactic acid and polyvinyl alcohol are dried to reduce the moisture contained in the two, and then mixed with other raw materials to generate degradable plastic masterbatch, which is simple and convenient to operate.

[0023] In the second aspect, the present application provides a method for preparing an air column bag with strong degradation ability, using the following technical solution:

[0024] A method for preparing an air column bag with strong degradation ability comprises the following steps: blowing a degradable plastic masterbatch into a film, heat-sealing a plurality of air nozzle valves between two layers of degradable plastic film along the length direction of the degradable plastic film, and then heat-sealing the degradable plastic film into a plurality of air column chambers corresponding to the air nozzle valves, wherein the air column chambers are in an elongated shape and the length direction of the air column chambers is parallel to the width direction of the degradable plastic film, and air is inflated into the air column chambers through ventilation valves to form air column coils, and the air column coils are wound around an object and fixed to form air column bags.

[0025] By adopting the above technical scheme, the prepared plastic masterbatch is made into a plastic film, and then an air column chamber is formed by heat-sealing an air nozzle valve, and finally the air column coil is wound and packaged to form an air column bag, and the operation process is simple.

[0026] In summary, this application has the following beneficial effects:

[0027] 1. In the present application, with the addition of bee pollen and hydroxypropyl-β-cyclodextrin, silk fiber is added to improve the stability and strength of plastic, thereby reducing the effect of bee pollen and hydroxypropyl-β-cyclodextrin on the performance of plastic. During composting, hydroxypropyl-β-cyclodextrin provides a moist environment for microbial reproduction due to its hygroscopicity, and the decomposition of bee pollen and silk fiber provides nutrients for microbial reproduction, further increasing the reproduction rate of microorganisms. The increase in the number of microorganisms increases the degradation rate, thereby promoting the decomposition of degradable plastics.

[0028] 2. In the present application, hydroxypropyl-β-cyclodextrin stabilizes nutrients such as amino acids, reduces the loss of nutrients due to denaturation and other reasons, and retains more nutrients for microbial absorption, thereby providing more nutrients for microbial reproduction.

[0029] 3. In the present application, both α-cyclodextrin and hydroxypropyl-β-cyclodextrin have the effect of promoting nucleation. In order to reduce the hygroscopicity of the plastic, α-cyclodextrin is added to reduce the amount of hydroxypropyl-β-cyclodextrin added, thereby effectively reducing the impact on the strength of the plastic. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural diagram of the air column bag in Example 23 of the present application;

[0031] Figure 2 This is a partial structural cross-sectional view of the air column bag in Example 23 of the present application.

[0032] Explanation of the accompanying drawings: 1. air column coil; 2. degradable plastic film; 3. air column chamber; 4. air nozzle valve. DETAILED DESCRIPTION

[0033] In the present application, polylactic acid is dried in an environment of 50°C for 4 hours; polyvinyl alcohol is dried in an environment of 50°C for 4 hours; the nucleating agent is powdered α-cyclodextrin; the coupling agent is a granular thermoplastic elastomer SEBS, i.e., maleic anhydride grafted polystyrene-polyethylene-polybutylene-polystyrene copolymer; the plasticizer is epoxy fatty acid methyl ester; the nutritional component is bee pollen, which is crushed to 800 mesh by a jet mill; the decomposition component is powdered hydroxypropyl-β-cyclodextrin; the toughening component is mulberry silk fiber with a diameter of D 90 =15μm, the length after cutting is 3mm; the photocatalyst is nano titanium dioxide with a particle size of 5nm.

[0034] The present application is further described in detail below with reference to the embodiments.

[0035] Example

[0036] Example 1

[0037] S1, take 10kg of polylactic acid and 0.6kg of polyvinyl alcohol and add them into a high-speed mixer, and then add 0.3kg of α-cyclodextrin, 0.1kg of coupling agent, 0.1kg of plasticizer, 0.3kg of bee pollen, 0.2kg of hydroxypropyl-β-cyclodextrin and 0.2kg of mulberry silk fiber in sequence, set the temperature to 120°C, the speed to 500r / min, and mix and stir for 30min;

[0038] S2. Add the mixture in S1 into a twin-screw extruder, control the temperature of the twin-screw extruder zones 1-8 to 180° C., 180° C., 185° C., 185° C., 190° C., 185° C., and 185° C., respectively, and the screw speed to 100 r / min, and extrude to obtain plastic masterbatch.

[0039] Example 2

[0040] S1, add 10kg of polylactic acid and 0.6kg of polyvinyl alcohol into a high-speed mixer, and add 0.4kg of α-cyclodextrin, 0.2kg of coupling agent, 0.2kg of plasticizer, 0.4kg of bee pollen, 0.3kg of hydroxypropyl-β-cyclodextrin and 0.2kg of mulberry silk fiber in sequence, set the temperature to 120°C, the speed to 500r / min, and mix and stir for 30min;

[0041] S2. Add the mixture in S1 into a twin-screw extruder, control the temperature of the twin-screw extruder zones 1-8 to 180° C., 180° C., 185° C., 185° C., 190° C., 185° C., and 185° C., respectively, and the screw speed to 100 r / min, and extrude to obtain plastic masterbatch.

[0042] Example 3

[0043] S1, add 10kg of polylactic acid and 0.6kg of polyvinyl alcohol into a high-speed mixer, and add 0.5kg of α-cyclodextrin, 0.3kg of coupling agent, 0.3kg of plasticizer, 0.5kg of bee pollen, 0.3kg of hydroxypropyl-β-cyclodextrin and 0.3kg of mulberry silk fiber in sequence, set the temperature to 120°C, the speed to 500r / min, and mix and stir for 30min;

[0044] S2. Add the mixture in S1 into a twin-screw extruder, control the temperature of the twin-screw extruder zones 1-8 to 180° C., 180° C., 185° C., 185° C., 190° C., 185° C., and 185° C., respectively, and the screw speed to 100 r / min, and extrude to obtain plastic masterbatch.

[0045] Example 4

[0046] S1, add 12kg of polylactic acid and 0.8kg of polyvinyl alcohol into a high-speed mixer, and add 0.3kg of α-cyclodextrin, 0.1kg of coupling agent, 0.1kg of plasticizer, 0.3kg of bee pollen, 0.2kg of hydroxypropyl-β-cyclodextrin and 0.2kg of mulberry silk fiber in sequence, set the temperature to 120°C, the speed to 500r / min, and mix and stir for 30min;

[0047] S2. Add the mixture in S1 into a twin-screw extruder, control the temperature of the twin-screw extruder zones 1-8 to 180° C., 180° C., 185° C., 185° C., 190° C., 185° C., and 185° C., respectively, and the screw speed to 100 r / min, and extrude to obtain plastic masterbatch.

[0048] Example 5

[0049] The difference from Example 4 is that in S1, the amount of α-cyclodextrin is 0.4 kg, the amount of coupling agent is 0.2 kg, and the amount of plasticizer is 0.2 kg.

[0050] Example 6

[0051] The difference from Example 5 is that the amount of hydroxypropyl-β-cyclodextrin in S1 is 0.3 kg.

[0052] Example 7

[0053] The difference from Example 5 is that the amount of hydroxypropyl-β-cyclodextrin in S1 is 0.4 kg.

[0054] Example 8

[0055] The difference from Example 5 is that the bee pollen in S1 is 0.4 kg.

[0056] Example 9

[0057] The difference from Example 8 is that the amount of hydroxypropyl-β-cyclodextrin in S1 is 0.3 kg.

[0058] Example 10

[0059] The difference from Example 8 is that the amount of hydroxypropyl-β-cyclodextrin in S1 is 0.4 kg.

[0060] Embodiment 11

[0061] The difference from Example 5 is that the bee pollen in S1 is 0.5 kg.

[0062] Example 12

[0063] The difference from Example 5 is that the amount of hydroxypropyl-β-cyclodextrin in S1 is 0.3 kg.

[0064] Example 13

[0065] The difference from Example 5 is that the amount of hydroxypropyl-β-cyclodextrin in S1 is 0.4 kg.

[0066] Embodiment 14

[0067] The difference from Example 9 is that the α-cyclodextrin in S1 is 0.3 kg

[0068] Embodiment 15

[0069] The difference from Example 9 is that the α-cyclodextrin in S1 is 0.5 kg

[0070] Example 16

[0071] The difference from Example 3 is that in S1, the amount of polylactic acid is 12 kg and the amount of polyvinyl alcohol is 8 kg.

[0072] Embodiment 17

[0073] The difference from Example 9 is that 0.1 kg of titanium dioxide is also added to S1.

[0074] Embodiment 18

[0075] The difference from Example 9 is that 0.12 kg of titanium dioxide is also added to S1.

[0076] Embodiment 19

[0077] The difference from Example 9 is that 0.14 kg of titanium dioxide is also added to S1.

[0078] Embodiment 20

[0079] The difference from Example 1 is that in S1, the amount of polylactic acid is 14 kg and the amount of polyvinyl alcohol is 10 kg.

[0080] Embodiment 21

[0081] The difference from Example 2 is that: in S1, the amount of polylactic acid is 14 kg and the amount of polyvinyl alcohol is 10 kg.

[0082] Embodiment 22

[0083] The difference from Example 3 is that in S1, the amount of polylactic acid is 14 kg and the amount of polyvinyl alcohol is 10 kg.

[0084] Embodiment 23

[0085] This embodiment combines Figure 1 and Figure 2 The preparation method of the air column bag is introduced.

[0086] A method for preparing an air column bag comprises the following steps:

[0087] S1, stacking two layers of degradable plastic films 2 of the same shape and size, wherein the degradable plastic films are arranged in a rectangular shape;

[0088] S2. Heat-seal a plurality of air valves 4 between two layers of degradable plastic films 2, wherein the plurality of air valves 4 are all located on the same side of the degradable plastic film 2 and are equidistantly spaced along the length direction of the degradable plastic film 2;

[0089] S3, forming a plurality of air column chambers 3 corresponding to the air nozzle valves 4 by heat sealing the degradable plastic film 2, wherein the air column chambers 3 are rectangular, the length direction of the air column chambers 3 is parallel to the width direction of the degradable plastic film 2, the air column chambers 3 are closed on three sides, and the air nozzle valves 4 are used as air inlets;

[0090] S4, ventilate the air column chamber 3 through the air nozzle valve 4 to form the air column coil 1, and wind the air column coil 1 around the object and fix it with tape to form an air column bag.

[0091] Comparative Example

[0092] Comparative Example 1

[0093] The difference from Example 9 is that no bee pollen is added in S1.

[0094] Comparative Example 2

[0095] The difference from Example 9 is that hydroxypropyl-β-cyclodextrin is not added to S1.

[0096] Comparative Example 3

[0097] The difference from Example 9 is that no silk fiber is added to S1.

[0098] Comparative Example 4

[0099] The difference from Example 9 is that hydroxypropyl-β-cyclodextrin and silk fiber are not added to S1.

[0100] Comparative Example 5

[0101] The difference from Example 9 is that no bee pollen and silk fiber are added to S1.

[0102] Comparative Example 6

[0103] The difference from Example 9 is that: bee pollen, hydroxypropyl-β-cyclodextrin and silk fiber are not added to S1.

[0104] Table 1 Examples and Comparative Examples Raw Materials (kg)

[0105]

[0106]

[0107]

[0108] The performance test refers to GB / T 1040.3-2006 "Determination of tensile properties of plastics Part 3: Test conditions for films and sheets" to test the tensile strength (MPa) of the degradable plastic masterbatch prepared in Examples 1 to 22 and Comparative Examples 1 to 6. The shape and size of the specimens refer to the type 2 specimen in 6.1.1, with a total length of 150 mm, a width of 10 mm, a thickness of 50 μm, and a test speed of 200 mm / min. Five groups of specimens are set for each embodiment or comparative example, and the average value is calculated after the test.

[0109] The disintegration degree (%) of the degradable plastic masterbatches obtained from Examples 1 to 22 and Comparative Examples 1 to 6 under defined composting pilot conditions was determined with reference to GB / T 19811-2005 "Determination of the degree of disintegration of plastic materials under defined composting pilot conditions". Before the test, the degradable plastic masterbatches were blown into films and cut to a size of 10 cm*10 cm*50 μm.

[0110] Table 2 Performance test data table

[0111]

[0112]

[0113] Combining Example 9 and Comparative Examples 1-6 and Table 2, it can be seen that adding only one of bee pollen, hydroxypropyl-β-cyclodextrin and silk fiber does not help much in degradation speed. When the three are combined, hydroxypropyl-β-cyclodextrin and silk fiber absorb moisture in the early stage of composting to provide a humid environment to promote microbial reproduction. When the microorganisms begin to reproduce, bee pollen and silk fiber begin to decompose and provide nutrients, so that the microorganisms can reproduce in large quantities, thereby effectively promoting plastic degradation. And when the strength of the plastic is reduced due to the addition of bee pollen and hydroxypropyl-β-cyclodextrin, silk fiber can reduce the degree of strength reduction of the plastic, so that the plastic maintains a certain strength and prolongs its service life.

[0114] Combining Example 9 and Examples 17-19 with Table 2, it can be seen that by adding titanium dioxide as a photocatalyst, photodegradation is performed for a period of time before composting degradation, so that some macromolecules are decomposed into small molecules, reducing the difficulty of microbial degradation and effectively improving the degradation efficiency.

[0115] It can be seen from Examples 5-13 and Table 2 that by adjusting the amounts of bee pollen, hydroxypropyl-β-cyclodextrin and silk fiber added and selecting the most appropriate ratio, the degradation efficiency can be effectively improved while reducing the strength reduction of the plastic, thereby significantly enhancing the degradation capacity of the plastic.

[0116] It can be seen from Example 9, Example 14 and Example 15 and Table 2 that by adjusting the amount of α-cyclodextrin added and selecting the addition ratio with hydroxypropyl-β-cyclodextrin, the strength of the plastic can be effectively improved and the effect of hydroxypropyl-β-cyclodextrin moisture absorption on the overall strength of the plastic can be reduced.

[0117] It can be seen from Example 2, Example 9 and Example 21 and Table 2 that by adjusting the amount of the basic raw materials, namely polylactic acid and polyvinyl alcohol, added, the ratio of the basic raw materials to the auxiliary components is controlled, thereby further improving the degradation rate.

[0118] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An air column bag with strong degradation ability, It is characterized in that Made of degradable plastic, the degradable plastic is composed of the following raw materials in parts by weight: 100-140 parts of polylactic acid, 6-10 parts of polyvinyl alcohol, 3-5 parts of nucleating agent, 1-3 parts of coupling agent, 1-3 parts of plasticizer, 1-1.4 parts of photocatalyst, and 7-11 parts of auxiliary components, wherein the auxiliary components include nutritional components, decomposition components and toughening components, and the weight ratio of the nutritional components, the decomposition components that promote the decomposition of the nutritional components and the toughening components is (3-5): (2-4): 2; The photocatalyst is nano titanium dioxide; The nutrient component is bee pollen, and the bee pollen is crushed to a particle size of 800 meshes; The decomposition component is hydroxypropyl-β-cyclodextrin; The toughening component is silk fiber; The nucleating agent is α-cyclodextrin; The preparation method of the degradable plastic comprises the following steps: drying polylactic acid and polyvinyl alcohol, mixing them with other raw materials, and then extruding and granulating them to form degradable plastic masterbatch; The air column bag with strong degradation ability comprises the following steps: blowing a degradable plastic masterbatch into a film, heat-sealing a plurality of air nozzle valves (4) between two layers of degradable plastic film along the length direction of the degradable plastic film, and then heat-sealing the degradable plastic film corresponding to the air nozzle valves (4) to divide the degradable plastic film into a plurality of air column chambers (3), wherein the air column chambers (3) are in the shape of long strips and the length direction of the air column chambers (3) is parallel to the width direction of the degradable plastic film, and air is inflated into the air column chambers (3) through the air nozzle valves (4) to form an air column coil (1), and the air column coil (1) is wound around an object and fixed to form an air column bag.

2. The air column bag with strong degradation ability according to claim 1, It is characterized in that The weight ratio of the nucleating agent to the nutritional components is 1:1.

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