High-reliability electromagnetic shielding anti-static bag sealing package

Abstract

The invention relates to the technical field of anti-static materials, and discloses a high-reliability electromagnetic shielding anti-static bag sealing package which comprises two sets of polylactic acid fiber braid layers, one side of each polylactic acid fiber braid layer is provided with a bio-based conductive polymer electromagnetic shielding layer, and the other side of each polylactic acid fiber braid layer is provided with an anti-static material. A natural rubber jute fiber reinforcing layer is arranged on one side of the bio-based conductive polymer electromagnetic shielding layer, a chitosan modified anti-static layer is arranged on one side of the natural rubber jute fiber reinforcing layer, and a starch-based sealing material layer is arranged on one side of the chitosan modified anti-static layer; a bag cavity is formed in one side of the starch-based sealing material layer. Through cooperation of multiple layers of structures, the polylactic acid fiber woven layer is used as a support, the chitosan modified anti-static layer is used as a core to inhibit generation and accumulation of static electricity, electromagnetic shielding, structure strengthening and sealing layers are matched, the static electricity is prevented from damaging internal objects, and the anti-static protection reliability in storage and transportation is improved. And the problem of external static damage in storage and transportation stages is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of anti-static materials, in particular to a high-reliability electromagnetic shielding anti-static bag sealing package. BACKGROUND

[0002] With the rapid development of modern science and technology, the requirements for production, storage and use environment in many fields such as electronic industry, semiconductor manufacturing, biomedicine, aerospace and the like are becoming increasingly stringent, especially in terms of static electricity protection.

[0003] In the production, transportation and storage processes of many electronic devices and precision instruments, static electricity is always a big problem. Since these articles are extremely sensitive to static electricity, even a small amount of static electricity accumulation can cause electronic components to be broken down, instruments to malfunction and the like. Although the existing anti-static materials and technologies can alleviate the static electricity problem to a certain extent, they still have many shortcomings, for example, the anti-static effect is not ideal, most materials cannot quickly and effectively conduct static electricity, which causes static electricity to easily accumulate and leads to the problem that the articles are easily damaged by external static electricity during storage and transportation. SUMMARY

[0004] In order to solve the problem that the articles are easily damaged by external static electricity during storage and transportation, the application provides a high-reliability electromagnetic shielding anti-static bag sealing package.

[0005] The high-reliability electromagnetic shielding anti-static bag sealing package provided by the application adopts the following technical scheme:

[0006] The high-reliability electromagnetic shielding anti-static bag sealing package comprises two groups of polylactic acid fiber woven layers, one side of each polylactic acid fiber woven layer is provided with a bio-based conductive polymer electromagnetic shielding layer, one side of the bio-based conductive polymer electromagnetic shielding layer is provided with a natural rubber hemp fiber reinforced layer, one side of the natural rubber hemp fiber reinforced layer is provided with a chitosan modified anti-static layer, one side of the chitosan modified anti-static layer is provided with a starch-based sealing material layer, one side of the starch-based sealing material layer is provided with a bag cavity, one side of the starch-based sealing material layer is provided with a double-convex bone strip, one side of the other starch-based sealing material layer is provided with a double-concave bone strip, the inside of the double-concave bone strip is provided with a groove, and the double-convex bone strip is clamped in the groove of the double-concave bone strip.

[0007] Through the above technical scheme, the multiple layers are coordinated, the polylactic acid fiber woven layer is used as support, the chitosan modified anti-static layer is used as the core to inhibit static electricity generation and accumulation, and the electromagnetic shielding, structural reinforcement and sealing layer are matched to avoid static electricity damage to the internal articles and improve the anti-static protection reliability during storage and transportation. The problem of damage to the articles by external static electricity during storage and transportation is solved.

[0008] Preferably, the chitosan modified anti-static layer is prepared by using the following raw materials: chitosan 3-6 parts, oleic acid 1-3 parts, silica sol 2-4 parts, deionized water 20-30 parts, titanate coupling agent 1-4 parts, polydopamine 1-3 parts, dibutyltin dilaurate 0.1-0.5 parts, nano titanium dioxide 1-2 parts, and glutaraldehyde 0.5-2 parts.

[0009] By adopting the above technical scheme, because the functions of each raw material are different and mutually synergistic, the system balance is maintained within a reasonable weight range, thus, the effect of excellent comprehensive performance is obtained, covering good anti-static, reliable mechanical, excellent chemical stability, firm combination with the substrate, uniform and dense microstructure and the like.

[0010] Preferably, the silica sol is prepared from a silicon source, water, an acid-base catalyst, a surfactant, and a dispersant.

[0011] By adopting the above technical scheme, because the functions of each raw material are different and mutually synergistic, the system balance is maintained within a reasonable weight range, thus, the effect of excellent comprehensive performance is obtained, covering good anti-static, reliable mechanical, excellent chemical stability, firm combination with the substrate, uniform and dense microstructure and the like.

[0012] Preferably, the nano titanium dioxide is prepared from tetrabutyl titanate, water, anhydrous ethanol, and hydrochloric acid.

[0013] By adopting the above technical scheme, because the functions of each raw material are different and mutually synergistic, the system balance is maintained within a reasonable weight range, thus, the effect of excellent comprehensive performance is obtained, covering good anti-static, reliable mechanical, excellent chemical stability, firm combination with the substrate, uniform and dense microstructure and the like.

[0014] Preferably, the preparation process of the chitosan modified anti-static layer comprises the following steps:

[0015] Raw material preparation: chitosan, oleic acid, silica sol, deionized water, titanate coupling agent, polydopamine, dibutyltin dilaurate, nano titanium dioxide, and glutaraldehyde are weighed and mixed in proportion to obtain a mixed raw material;

[0016] Chitosan solution preparation: chitosan is added to deionized water to dissolve the chitosan, thereby obtaining a chitosan solution, which serves as a basic solution for the reaction;

[0017] Mixed solution preparation: oleic acid, silica sol, and titanate coupling agent are added to the continuously stirred chitosan solution to fully mix and uniform the components, thereby forming a chitosan composite mixed solution;

[0018] Component addition: polydopamine and nano titanium dioxide are sequentially added to the chitosan composite mixed solution, and then dibutyltin dilaurate is added as a catalyst to obtain a modified chitosan solution;

[0019] Cross-linking reaction: add glutaraldehyde to the modified chitosan solution, adjust the pH value of the solution, so that cross-linking occurs between chitosan molecules;

[0020] Anti-static layer preparation: the cross-linked modified chitosan solution is applied to the surface of the base material by coating process, and the coating thickness is controlled to form a chitosan modified anti-static layer on the surface of the base material.

[0021] By adopting the above technical scheme, due to the precise operation and orderly cooperation of each step, the raw materials are reasonably prepared, the reaction is fully carried out, the structure is stable, and the molding is good, so that the performance of the anti-static layer is stable and the comprehensive performance can be effectively played.

[0022] Preferably, in the raw material preparation, the chitosan raw material is pretreated as follows: select chitosan raw material with deacetylation degree ≥85%, and crush the chitosan raw material to reduce the particle size to 50-200 mesh for subsequent dissolution operation in deionized water.

[0023] By adopting the above technical scheme, because high deacetylation degree chitosan is selected and crushed to a suitable particle size, it is beneficial to its full dissolution, which lays the foundation for the subsequent process, so that the quality of the anti-static layer is more stable and the performance is more reliable.

[0024] Preferably, in the chitosan solution preparation, the reaction temperature is 20-30℃ and the time is 30-60 minutes. This temperature and time range can make the chitosan fully dissolve in deionized water under relatively mild conditions to form a uniform chitosan solution.

[0025] By adopting the above technical scheme, because the range is moderate and reasonable, it is beneficial to the full and uniform dissolution of chitosan, which provides a high-quality solution for the subsequent reaction, so that the performance of the anti-static layer is stable and the quality is reliable.

[0026] Preferably, in the preparation of the mixed solution, the stirring speed is controlled at 200-400 revolutions per minute, the reaction temperature is controlled at 40-60℃, and the stirring time is controlled at 30-60 minutes, so that the materials are fully mixed to form a chitosan composite mixed solution.

[0027] By adopting the above technical scheme, because the parameters are reasonably matched, the materials are fully and uniformly mixed to provide a high-quality solution for the subsequent process, so that the performance of the anti-static layer is stable and the components are uniformly distributed.

[0028] Preferably, in the component addition, the heating temperature is controlled at 50-70℃ and the reaction time is controlled at 2-4 hours. In this temperature and time range, the synergistic modification of polydopamine and chitosan, the dispersion and interface combination of nano-titanium dioxide, and the catalytic cross-linking reaction of dibutyltin dilaurate can be realized.

[0029] By adopting the above technical scheme, because the temperature and time are suitable, the components can be fully reacted, and the subsequent process is laid, so that the comprehensive performance of the antistatic layer is more optimal.

[0030] Preferably, in the preparation of the antistatic layer, the drying temperature is set to 60-80°C, and the drying time is 12-24 hours, so that the solvent in the cross-linked modified chitosan solution coated on the surface of the base material can be fully volatilized.

[0031] By adopting the above technical scheme, because the temperature and time are suitable, the components can be fully reacted, and the subsequent process is laid, so that the comprehensive performance of the antistatic layer is more optimal.

[0032] The application provides a high-reliability electromagnetic shielding and antistatic bag sealing package.

[0033] 1. The application uses a polylactic acid fiber woven layer as support through a multi-layer structure, and uses a chitosan modified antistatic layer to suppress static electricity generation and accumulation, and cooperates with electromagnetic shielding, structure strengthening and a sealing layer to avoid static damage to internal items and improve the reliability of antistatic protection during storage and transportation.

[0034] 2. The application sets a chitosan modified antistatic layer composed of chitosan, oleic acid and silica sol, so that the package has an antistatic function, thereby improving the problem that traditional packages are mostly made of ordinary materials and lack antistatic design, thereby failing to effectively protect static sensitive items.

[0035] 3. The application uses chitosan raw materials with a degree of deacetylation of greater than or equal to 85% and subjected to crushing treatment for preparation, thereby ensuring that chitosan can be more fully and quickly dissolved and participate in subsequent reactions, thereby improving the problem that traditional chitosan is not treated and is not fully dissolved, thereby causing unstable performance of the prepared antistatic layer.

[0036] 4. The application sets the drying temperature to 60-80°C and controls the drying time to 12-24 hours during the preparation of the antistatic layer, thereby fully volatilizing the solvent in the cross-linked modified chitosan solution, thereby improving the problem that the drying conditions in the preparation of traditional antistatic layers are unreasonable, the solvent is not fully volatilized, and the drying degree of the antistatic layer is poor and the combination with the base is not firm. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The application provides a front side perspective view of a polylactic acid fiber woven layer;

[0038] Figure 2 The application provides a partial structure schematic view of a bag cavity.

[0039] Figure 3 A local structure schematic diagram of the bio-based conductive polymer electromagnetic shielding layer provided in the present application is shown in the figure;

[0040] Figure 4 A cross-sectional view of the chitosan modified anti-static layer provided in the present application is shown in the figure;

[0041] Figure 5 A preparation process flow chart of the chitosan modified anti-static layer provided in the present application is shown in the figure.

[0042] In the figure, 1, polylactic acid fiber woven layer; 2, bag cavity; 3, double concave bone strip; 4, double convex bone strip; 5, bio-based conductive polymer electromagnetic shielding layer; 6, natural rubber hemp fiber reinforced layer; 7, chitosan modified anti-static layer; 8, starch-based sealing material layer. DETAILED DESCRIPTION

[0043] The present application will be further described in detail below in combination with the accompanying drawings and examples.

[0044] Technical concept: The problems existing in the prior art are solved through two aspects, one is to optimize the raw material composition and ratio, select chitosan, oleic acid, silica sol and other raw materials and determine the reasonable weight ratio, and use the synergistic cooperation between the raw materials to build an efficient anti-static system; the other is to precisely control the preparation process, such as temperature, time, stirring speed and other key conditions in the aspects of raw material preparation, chitosan solution preparation, mixed solution preparation, ingredient addition, crosslinking reaction and anti-static layer preparation, to ensure that each component fully reacts and uniformly mixes, forms a stable structure, enhances the comprehensive performance of the anti-static layer such as anti-static, mechanical and chemical stability, and makes it more firmly combined with the substrate, and fully solves the deficiencies of the prior art in many aspects.

[0045] Please refer to the accompanying Figure 1 - the accompanying Figure 4 The present application provides a kind of high reliability electromagnetic shielding anti-static bag sealing packaging, including two groups of polylactic acid fiber woven layer 1, polylactic acid fiber woven layer 1 One side is provided with bio-based conductive polymer electromagnetic shielding layer 5, bio-based conductive polymer electromagnetic shielding layer 5 One side is provided with natural rubber hemp fiber reinforced layer 6, natural rubber hemp fiber reinforced layer 6 One side is provided with chitosan modified anti-static layer 7, chitosan modified anti-static layer 7 One side is provided with starch-based sealing material layer 8, starch-based sealing material layer 8 One side is provided with bag cavity 2, starch-based sealing material layer 8 One side is provided with double convex bone strip 4, another starch-based sealing material layer 8 One side is provided with double concave bone strip 3, double concave bone strip 3 It is provided with recess in the inside, and double convex bone strip 4 With the recess of double concave bone strip 3 It is engaged.

[0046] Specifically, the polylactic acid fiber woven layer 1 as the basic structure layer of the bag body, through the structure formed by polylactic acid fiber weaving, provides structural strength; the bio-based conductive polymer electromagnetic shielding layer 5 shields electromagnetic signals by virtue of its own conductive properties; the natural rubber hemp fiber reinforced layer 6 strengthens the overall structural toughness; the chitosan modified anti-static layer 7 realizes anti-static function through chitosan modification, inhibits static generation and accumulation; the starch-based sealing material layer 8 guarantees the sealing performance of the bag body, and the double-convex bone strip 4 on one side and the double-concave bone strip 3 on the other side of the starch-based sealing material layer 8 of the other bag body are connected by the double-convex bone strip 4 being clamped into the groove of the double-concave bone strip 3, realizing the sealing connection of the bag body and constructing the closed bag cavity 2.

[0047] Through the cooperation of the multi-layer structure, the polylactic acid fiber woven layer 1 is used as support, the chitosan modified anti-static layer 7 is used to inhibit static generation and accumulation, and the electromagnetic shielding, structural reinforcement and sealing layer are used to avoid static damage to the internal items and improve the reliability of anti-static protection in storage and transportation. The problem of damage by external static in the storage and transportation stage is solved.

[0048] Please refer to the attached Figure 5 The chitosan modified anti-static layer 7 is made of the following raw materials by weight: chitosan 3-6 parts, oleic acid 1-3 parts, silica sol 2-4 parts, deionized water 20-30 parts, titanate coupling agent 1-4 parts, polydopamine 1-3 parts, dibutyltin dilaurate 0.1-0.5 parts, nano titanium dioxide 1-2 parts, and glutaraldehyde 0.5-2 parts.

[0049] Specifically, chitosan as the main component, under the interaction with other raw materials, forms a structure with anti-static performance. Oleic acid helps to improve the compatibility and dispersibility of the system, so that each component is more evenly distributed, thereby facilitating the overall anti-static performance. Silica sol can enhance the mechanical strength and stability of the layer, providing a supporting structure for the anti-static function. Deionized water as a solvent provides a medium environment for the dissolution of chitosan and the reaction between components. The titanate coupling agent plays a connecting role, enhancing the bonding force between chitosan and other inorganic components, making the synergistic effect of each component more efficient and further improving the anti-static performance. Polydopamine has good adhesion and conductivity, which helps to bond between layers on one hand, and its conductivity can assist in improving the overall anti-static effect on the other hand. Dibutyltin dilaurate as a catalyst accelerates the reaction process, promotes the reaction of each component faster and more fully, and forms a stable anti-static structure. Nano titanium dioxide, with its special nano structure and optical and electrical properties, can synergistically enhance the anti-static effect, while also improving the mechanical properties of the layer. Glutaraldehyde as a crosslinking agent makes chitosan molecules form a crosslinked structure, improving the stability and durability of the chitosan modified anti-static layer 7 and ensuring the long-term stability of the anti-static performance.

[0050] The silica sol is prepared from a silicon source, water, an acid-base catalyst, a surfactant and a dispersant.

[0051] Specifically, the silicon source is the basis material for preparing the silica sol, and can be converted into silica particles through a specific reaction to form the main component of the silica sol and provide the basic material framework for the silica sol. Water is used as a solvent and participates in the entire reaction process to create a suitable reaction medium environment for the conversion of the silicon source and the interaction between the components, ensuring that the reaction can proceed smoothly and promote the effective formation of the silica sol. The acid-base catalyst plays a key role in adjusting the reaction rate in the preparation of the silica sol, and can accurately control the speed of the reaction to make the silicon source react in the expected direction and speed, which helps to generate silica particles with the required particle size and performance, thereby ensuring that the silica sol has stable and reliable performance. The surfactant can be adsorbed on the surface of the silica particles to change the properties of the particle surface, reduce the surface energy, prevent the silica particles from agglomerating with each other, and make the particles in the silica sol uniformly dispersed, thereby improving the overall stability and uniformity of the silica sol. The dispersant can further enhance the dispersion effect of the silica particles in the system, cooperate with the surfactant, and maintain the dispersion state of the particles to a greater extent to avoid particle aggregation and growth, ensuring that the silica sol always maintains good dispersion characteristics and stable performance during long-term storage and subsequent application to meet the actual use requirements.

[0052] The nano-titanium dioxide is prepared from tetrabutyl titanate, water, anhydrous ethanol and hydrochloric acid.

[0053] Specifically, tetrabutyl titanate is the key precursor raw material for generating nano-titanium dioxide, and the titanium element contained therein can be gradually converted into nano-scale titanium dioxide structure through a specific chemical reaction to provide a core material source for the subsequent nano-titanium dioxide to exert its corresponding functions. Water participates in the reaction system and, in the reaction process with tetrabutyl titanate, on the one hand, provides hydroxyl ions and the like necessary for the hydrolysis reaction to promote the hydrolysis reaction of tetrabutyl titanate, and on the other hand, as a solvent medium, creates a suitable reaction environment for the interaction between substances to ensure that the reaction proceeds in an orderly manner and helps the generation of nano-titanium dioxide. Anhydrous ethanol plays the role of a dispersant in this preparation process, which can make the reaction substances such as tetrabutyl titanate uniformly dispersed in the system to avoid uneven reaction caused by excessive local concentration, and at the same time, helps the generated nano-titanium dioxide particles to be uniformly dispersed to prevent particle agglomeration, which is conducive to obtaining nano-titanium dioxide products with uniform particle size and good dispersion. Hydrochloric acid as a reaction regulator can adjust the pH of the reaction system and accurately control the hydrolysis rate and degree of tetrabutyl titanate to ensure that the generated nano-titanium dioxide particles meet the expected requirements in terms of particle size and morphology, thereby ensuring that the nano-titanium dioxide can stably exert its corresponding physical and chemical properties in subsequent applications to meet the corresponding use requirements.

[0054] Reference is made to the accompanying drawings Figure 5 The preparation process of the chitosan modified anti-static layer 7 includes the following steps:

[0055] Raw material preparation: chitosan, oleic acid, silica sol, deionized water, titanate coupling agent, polydopamine, dibutyltin dilaurate, nano titanium dioxide, and glutaraldehyde are weighed according to the proportion and mixed to obtain a mixed raw material;

[0056] Chitosan solution preparation: chitosan is added to deionized water to dissolve the chitosan, obtaining a chitosan solution as a reaction base solution;

[0057] Mixed solution preparation: oleic acid, silica sol, and titanate coupling agent are added to the continuously stirred chitosan solution to fully mix and evenly form a chitosan composite mixed solution;

[0058] Component addition: polydopamine and nano titanium dioxide are sequentially added to the chitosan composite mixed solution, and then dibutyltin dilaurate is added as a catalyst to obtain a modified chitosan solution;

[0059] Cross-linking reaction: glutaraldehyde is added to the modified chitosan solution to adjust the pH value of the solution, so that cross-linking occurs between chitosan molecules;

[0060] Anti-static layer preparation: the cross-linked modified chitosan solution is applied to the surface of the base material by coating process, the coating thickness is controlled, and the chitosan modified anti-static layer 7 is formed on the surface of the base material.

[0061] Specifically, by weighing chitosan, oleic acid, silica sol, deionized water, titanate coupling agent, polydopamine, dibutyltin dilaurate, nano titanium dioxide, and glutaraldehyde according to the proportion and mixing, the amount of each component can be controlled, ensuring that the content of each substance in the subsequent reaction system is appropriate, laying a foundation for generating a chitosan modified anti-static layer 7 with stable performance and meeting the requirements, so that each component can play a role as expected in the subsequent steps, realizing the functions of anti-static and the like.

[0062] Chitosan is added to deionized water to dissolve, obtaining a chitosan solution as a reaction base solution. This operation can make chitosan uniformly dispersed in the solvent to form a stable homogeneous system, which is beneficial to the subsequent full contact and reaction with other components, ensuring that the subsequent reaction can orderly proceed in a uniform and stable medium environment, avoiding abnormal local reaction caused by uneven dispersion of chitosan, thereby providing good starting conditions for the preparation of the entire modified anti-static layer.

[0063] The oil acid, silica sol and titanate coupling agent are added into the continuously stirred chitosan solution, and the continuous stirring can promote the rapid and sufficient mixing of each component to form a chitosan composite mixed solution. In this process, the oil acid can improve the compatibility of the system, the silica sol can enhance the overall structural stability, and the titanate coupling agent can strengthen the binding force between each component. Through sufficient mixing, each component interacts and cooperates to lay the foundation for further adding components and reactions.

[0064] The polydopamine and nano titanium dioxide are sequentially added into the chitosan composite mixed solution, and the dibutyltin dilaurate is added as a catalyst. The polydopamine can enhance the conductivity of the whole and the adhesion between each component due to its own characteristics. The nano titanium dioxide can synergistically improve the antistatic effect by using its special structure and performance. The dibutyltin dilaurate can accelerate the reaction process between each component, promote the sufficient reaction of each component, and obtain a modified chitosan solution. Further, the performance of the solution system is optimized, and the antistatic function is strengthened, so that the prepared antistatic layer can more effectively inhibit the generation and accumulation of static electricity.

[0065] The glutaraldehyde is added into the modified chitosan solution to adjust the pH value of the solution, so that the cross-linking between chitosan molecules occurs. The cross-linking reaction can improve the stability of chitosan molecules and the strength of the overall structure, so that the modified chitosan solution forms a stable three-dimensional network structure, avoids the destruction of the structure in the subsequent use process, ensures the long-term effectiveness and reliable antistatic performance of the antistatic layer, and enables it to continuously play an antistatic role in different environmental conditions.

[0066] The cross-linked modified chitosan solution is applied to the surface of the base material by coating process, and the coating thickness is controlled, so that the modified chitosan solution can be uniformly distributed on the base material and form a chitosan modified antistatic layer 7 with appropriate thickness. This ensures the close combination of the antistatic layer and the base material, and the reasonable control of the thickness ensures the effective exertion of the antistatic performance and the rationality of the overall structure, so that it can be practically applied to the scenes requiring antistatic protection, and provide reliable antistatic protection for related articles.

[0067] In the raw material preparation, the chitosan raw material is pretreated as follows: select chitosan raw material with deacetylation degree ≥85%, and perform crushing treatment to reduce the particle size of chitosan particles to 50-200 meshes for subsequent dissolution operation in deionized water.

[0068] Specifically, chitosan raw material with a deacetylation degree of ≥85% is selected. A higher deacetylation degree means a relatively higher amino content in the chitosan molecules, which enhances the reactivity and is more conducive to subsequent chemical reactions such as cross-linking with other components in the process of preparing the chitosan modified antistatic layer 7, thereby improving the overall modification effect and the performance stability of the antistatic layer.

[0069] The chitosan raw material is crushed to reduce the particle size to 50-200 meshes, thereby increasing the contact area between the chitosan and the deionized water. In the subsequent dissolution operation, the dissolution speed of the chitosan in the deionized water can be accelerated, and the chitosan can be dissolved more rapidly and more fully, thereby ensuring the formation of a uniform and stable chitosan solution. This provides a good homogeneous reaction medium for the subsequent mixing, reaction and other steps of adding the chitosan solution to the other components, which helps the uniform dispersion and full interaction of the components in the solution system, avoids the problems of incomplete and uneven reaction due to insufficient or uneven distribution of the chitosan, and ensures that the preparation process of the chitosan modified anti-static layer 7 can proceed smoothly as expected, thereby improving the quality and consistency of the anti-static performance of the final product.

[0070] In the preparation of the chitosan solution, the reaction temperature is 20-30°C, and the time is 30-60 minutes. This temperature and time range can allow the chitosan to be fully dissolved in the deionized water under relatively mild conditions, thereby forming a uniform chitosan solution.

[0071] Specifically, the relatively mild temperature range of 20-30°C can avoid unnecessary changes in the molecular structure of the chitosan, such as chain rupture and degradation, thereby ensuring the chemical structure integrity of the chitosan and maintaining its inherent properties and activity in subsequent reactions. At the same time, this temperature range provides a suitable thermal environment for the dissolution of the chitosan in the deionized water, and the dissolution speed will not be too slow due to the low temperature, so that the entire dissolution process can proceed at a reasonable rate.

[0072] The time of 30-60 minutes is sufficient to ensure that the chitosan is fully dissolved in the deionized water. Under the above suitable temperature conditions, the chitosan particles can be uniformly dispersed in the solvent until complete dissolution, thereby forming a uniform chitosan solution. Such a uniform solution as a basic solution for subsequent reactions provides good conditions for uniform mixing and full reaction between the components when other components are added, avoids local reaction differences caused by uneven chitosan solution, and helps the orderly and stable development of each step of the chitosan modified anti-static layer 7 preparation process, thereby ensuring that the final anti-static layer has stable and reliable performance.

[0073] In the preparation of the mixed solution, the stirring speed is controlled at 200-400 rpm, the reaction temperature is controlled at 40-60°C, and the stirring time is controlled at 30-60 minutes, so that the materials are fully mixed to form a chitosan composite mixed solution.

[0074] Specifically, the stirring speed is controlled at 200-400 rpm, which can provide suitable shearing force and mixing degree for the system. On the one hand, the materials such as oleic acid, silica sol and titanate coupling agent added to the chitosan solution can be rapidly and fully dispersed in the solution, avoiding agglomeration, precipitation or local high concentration due to slow stirring, and ensuring uniform distribution of each component in the solution system; on the other hand, it can prevent excessive air from being introduced to form bubbles due to too fast stirring, or damage the stability of the system due to excessive shearing force, ensuring that the solution system is always in a stable and uniform state during mixing, and creating good conditions for subsequent full interaction between components.

[0075] The reaction temperature is set at 40-60°C, which provides a suitable energy environment for the chemical reaction and physical mixing between materials. At this temperature, the interaction between oleic acid, silica sol, chitosan and titanate coupling agent can proceed smoothly, the titanate coupling agent can better play its coupling role, promote the chemical bonding and combination between components, and make the mixing between components more compact and efficient, which helps to accelerate the formation of a stable and uniform chitosan composite mixed solution. This temperature range can avoid insufficient reactivity and low mixing efficiency of components due to too low temperature, and can also prevent decomposition, deterioration or initiation of some side reactions of some materials due to too high temperature, ensuring that each material participates in the mixing process in a normal and stable state.

[0076] The stirring time is specified as 30-60 minutes, and under the conditions of the determined suitable stirring speed and reaction temperature, the continuous stirring for this duration is sufficient to ensure that each material is fully mixed and uniform. After this period of stirring, the continuous interaction between components can form a stable structure and uniform composition of the composite system, laying a good foundation for further adding and reacting with components such as polydopamine and nano titanium dioxide. If the stirring time is too short, the materials cannot be fully mixed, which will lead to uneven solution composition and affect the subsequent reaction; and if the stirring time is too long, in the case of uniform mixing, it will consume additional energy and may cause unnecessary external influences on the solution system due to long-term stirring, which is not conducive to the efficient performance of the entire preparation process.

[0077] In the component addition, the heating temperature is controlled at 50-70°C, and the reaction time is 2-4 hours. Within this temperature and time range, the synergistic modification of polydopamine and chitosan, the dispersion and interfacial combination of nano titanium dioxide, and the catalytic crosslinking reaction of dibutyltin dilaurate can be achieved.

[0078] Specifically, the heating temperature is controlled in the range of 50-70℃, which creates a suitable thermal environment for the reaction among the components. For the synergistic modification of polydopamine and chitosan, at this temperature, polydopamine can better exert its good adhesion properties, making it tightly combined with chitosan molecules, enhancing the interaction between them, and thus improving the overall conductivity and antistatic performance, realizing the synergistic effect of the two, and optimizing the modification effect.

[0079] Under the synergistic effect of titanate coupling agent, nano-titanium dioxide particles can be more uniformly dispersed in the solution, avoiding agglomeration, and better interface combined with the organic phase, firmly integrated into the system through chemical bonding, etc., not only further strengthening the antistatic performance, but also enhancing the stability and mechanical properties of the entire solution system.

[0080] For the catalytic crosslinking reaction of dibutyltin dilaurate, this temperature range can ensure that the catalyst activity is in good condition, promote the condensation reaction between the silica sol and chitosan, etc., accelerate the formation of a stable three-dimensional network structure, make the connection between the components more closely, and improve the stability of the overall structure, laying a foundation for the long-term performance of the subsequent antistatic layer.

[0081] The reaction time is set to 2-4 hours, which can ensure that the above-mentioned key reactions such as the synergistic modification of polydopamine and chitosan, the dispersion and interface combination of nano-titanium dioxide, and the catalytic crosslinking of dibutyltin dilaurate are fully carried out. Sufficient reaction time gives each component the opportunity to fully contact and interact with each other, allowing each reaction to proceed as expected until a relatively stable state is reached, thereby ensuring that the modified chitosan solution obtained has excellent and stable performance, providing reliable protection for the final preparation of high-quality chitosan modified antistatic layer 7, and enabling it to stably exert various functions such as antistatic in actual application.

[0082] In the preparation of the antistatic layer, the drying temperature is set to 60-80℃, and the drying time is 12-24 hours, which can make the solvent in the cross-linked modified chitosan solution coated on the surface of the base material fully volatilize.

[0083] Specifically, the drying temperature is set to 60-80℃, which can provide suitable energy conditions for solvent volatilization. At this temperature, the solvent molecules in the cross-linked modified chitosan solution coated on the surface of the base material can obtain sufficient kinetic energy, overcome intermolecular forces, and gradually escape from the solution system, thereby realizing effective volatilization of the solvent. At the same time, this temperature range can avoid the slow volatilization of the solvent due to too low temperature. If the solvent does not volatilize completely, it will remain in the antistatic layer, affecting the drying degree of the antistatic layer, and possibly changing its internal structure, thereby weakening the bonding strength of the antistatic layer with the base material and its own antistatic performance, etc.

[0084] The drying time is 12-24 hours, which can ensure the solvent to be fully and completely volatilized under the above suitable drying temperature. The sufficient time ensures the solvent molecules to have sufficient opportunity to continuously escape from the solution system until the ideal drying state is reached. If the drying time is too short, the solvent cannot be fully volatilized, which will cause the above adverse effects; if the drying time is too long, although the solvent can be completely volatilized, the modified chitosan anti-static layer 7 may be cracked and brittle due to the long time in the high temperature environment, which will damage the structural integrity and is also not conducive to the stable performance of the anti-static property and the reliability in practical application.

[0085] The raw materials used in the present application are as follows:

[0086] Chitosan: extracted from the shells of crustaceans such as shrimp, crab, etc.

[0087] Oleic acid: usually separated and extracted from natural oils such as olive oil, fish oil, beef tallow, etc.

[0088] Silica sol: obtained from chemical production plants, prepared by chemical synthesis;

[0089] Deionized water: treated by ion exchange resin from ordinary tap water;

[0090] Titanate coupling agent: obtained from chemical production plants, produced by organic synthesis process;

[0091] Polydopamine: commercially available, prepared by oxidative self-polymerization reaction using dopamine hydrochloride as raw material;

[0092] Dibutyltin dilaurate: obtained from chemical production plants, prepared by organotin synthesis process;

[0093] Nano-titanium dioxide: obtained from nano-material production plants, prepared by hydrolysis and polycondensation chemical reaction process;

[0094] Glutaraldehyde: obtained from industrial chemical production plants, produced by chemical synthesis.

[0095] Example 1

[0096] The chitosan modified anti-static layer 7 is prepared by the following raw materials in weight parts: chitosan 6 parts, oleic acid 3 parts, silica sol 4 parts, deionized water 30 parts, titanate coupling agent 4 parts, polydopamine 3 parts, dibutyltin dilaurate 0.5 parts, nano-titanium dioxide 2 parts, and glutaraldehyde 2 parts.

[0097] Preparation process:

[0098] Raw material preparation: the chitosan, oleic acid, silica sol, deionized water, titanate coupling agent, polydopamine, dibutyltin dilaurate, nano titanium dioxide, glutaraldehyde were weighed according to the proportion and mixed to obtain the mixed raw material;

[0099] Chitosan solution preparation: chitosan was added to deionized water to dissolve the chitosan and obtain a chitosan solution, which was used as the base solution for the reaction;

[0100] Mixed solution preparation: oleic acid, silica sol and titanate coupling agent were added to the continuously stirred chitosan solution to fully mix and evenly form a chitosan composite mixed solution;

[0101] Component addition: polydopamine and nano titanium dioxide were sequentially added to the chitosan composite mixed solution, and then dibutyltin dilaurate was added as a catalyst to obtain a modified chitosan solution;

[0102] Crosslinking reaction: glutaraldehyde was added to the modified chitosan solution to adjust the pH value of the solution, so that crosslinking occurred between the chitosan molecules;

[0103] Anti-static layer preparation: the crosslinked modified chitosan solution was applied to the surface of the base material using a coating process, the coating thickness was controlled, and a chitosan modified anti-static layer was formed on the surface of the base material.

[0104] Example 2

[0105] The chitosan modified anti-static layer 7 was prepared from the following raw materials by weight: chitosan 4.5 parts, oleic acid 2 parts, silica sol 3 parts, deionized water 25 parts, titanate coupling agent 2.5 parts, polydopamine 2 parts, dibutyltin dilaurate 0.3 parts, nano titanium dioxide 1.5 parts, and glutaraldehyde 1.25 parts.

[0106] The preparation process is the same as that of Example 1.

[0107] Example 3

[0108] The chitosan modified anti-static layer 7 was prepared from the following raw materials by weight: chitosan 3-6 parts, oleic acid 1 part, silica sol 2 parts, deionized water 20 parts, titanate coupling agent 1 part, polydopamine 1 part, dibutyltin dilaurate 0.1 part, nano titanium dioxide 1 part, and glutaraldehyde 0.5 part.

[0109] The preparation process is the same as that of Example 1.

[0110] Comparative Example 1

[0111] Raw material composition: chitosan 6 parts, oleic acid 3 parts, silica sol 4 parts, deionized water 30 parts, titanate coupling agent 4 parts, dibutyltin dilaurate 0.5 parts, and glutaraldehyde 2 parts.

[0112] Preparation process: After weighing and mixing the raw materials according to the proportion, the antistatic layer is formed by conventional steps such as chitosan dissolution, mixed solution preparation, catalyst addition, cross-linking, and coating.

[0113] Comparative Example 2

[0114] Raw material composition: The amount of chitosan is increased to 10 parts, oleic acid is reduced to 0.5 parts, and the amount of other raw materials such as silica sol and deionized water is the same as in Example 1.

[0115] Preparation process: Weigh the raw materials according to the modified ratio, and then prepare the antistatic layer by sequentially going through conventional chitosan dissolution, solution mixing, component addition, cross-linking, coating and other process steps.

[0116] Comparative Example 3

[0117] Raw material composition: Same raw materials and amounts as in Example 1.

[0118] Preparation process: After raw material preparation, the process involves steps such as chitosan dissolution, mixed solution preparation, and component addition. During the cross-linking reaction, the temperature is raised to 80℃, and then an antistatic layer is formed by coating.

[0119] Comparative Example 4

[0120] Raw material composition: Same raw materials and amounts as in Example 1.

[0121] Preparation process: The previous steps of raw material preparation and chitosan dissolution are carried out normally. The cross-linking reaction time is shortened to 0.5 hours. Finally, an antistatic layer is formed by coating.

[0122] To verify the effectiveness of the chitosan-modified antistatic layer of this application, experiments were conducted on the chitosan-modified antistatic layers of the above embodiments and comparative examples, and the following indicators were tested:

[0123] Antistatic performance indicators: By testing surface resistivity and electrostatic half-life, the ability of chitosan-modified antistatic layer to conduct away and dissipate static electricity can be directly measured, thereby judging whether its antistatic function is good.

[0124] Mechanical performance indicators: Tensile strength and elongation at break are two mechanical performance indicators that examine the stability of the antistatic layer under different external forces from the perspectives of maximum strength under external force and flexibility and ductility, respectively, to ensure that it will not be easily damaged or cracked in actual use and to maintain normal antistatic function.

[0125] Chemical stability related indicators: Water resistance and chemical corrosion resistance indicators focus on the stability of the antistatic layer after contact with water and various common chemical reagents. Check whether there are any changes in appearance and performance to determine whether it can maintain good antistatic and other related properties in complex chemical environments, and ensure its durability.

[0126] The peeling strength index is related to the bonding performance of the base material. The peeling strength index can clearly indicate the bonding strength of the antistatic layer and the base material, avoid delamination and peeling in use, and ensure that the antistatic layer is stably attached to the base.

[0127] The microstructure-related index: Micro-morphology observation and component analysis can examine the structural uniformity, component distribution and interaction of the antistatic layer from the micro level by means of professional instrument means, verify the rationality of the preparation process and the achievement of the expected effect, and provide a basis for judging the performance reliability of the antistatic layer.

[0128] The detection results of each index are shown in the following table:

[0129] Group Surface resistivity (Ω) Electrostatic half-life (s) Tensile strength (MPa) Elongation at break (%) Peeling strength (N / m) Example 1 1 x 10 6 ]] 0.5 15 300 150 Example 2 1.2 x 10 6 ]]> 0.6 13 280 130 Example 3 1.5 x 10 6 ]]> 0.8 12 250 120 Comparative Example 1 5 x 10 8 ]] 3 8 150 80 Comparative Example 2 3 x 10 7 ]] 2 10 200 100 Comparative Example 3 2 x 10 7 ]] 1.5 9 220 90 Comparative Example 4 8 x 10 6 ]] 1 11 260 110

[0130] From the above table:

[0131] From the detection data of surface resistivity and static half-life, the values of Examples 1-3 are relatively low, indicating that they have good ability to conduct static electricity and quickly dissipate static electricity. The surface resistivity of Comparative Example 1 is significantly increased due to the lack of key components (polydopamine and nano titanium dioxide), and the static half-life is significantly longer. The antistatic performance of Comparative Examples 2-4 is also inferior to the examples due to changes in raw material ratio or process conditions.

[0132] In terms of tensile strength and elongation at break, the examples show relatively high tensile strength and suitable elongation at break, indicating that they have good structural strength and good flexibility and ductility. Comparative Examples 1 and 2 have significantly lower tensile strength and unsatisfactory elongation at break due to changes in raw materials. Comparative Examples 3 and 4 also show fluctuations in these two indicators to varying degrees due to changes in process conditions.

[0133] Observing the water resistance and chemical corrosion resistance indexes, the appearance and performance of the examples change relatively little after being soaked in water or exposed to common chemical reagents, showing good chemical stability. In contrast, most of the comparative examples have serious problems such as foaming, corrosion, and significant performance decline, indicating poor chemical stability.

[0134] From the peeling strength data, it can be seen that the peeling strength of the examples is relatively high, indicating that the antistatic layer is firmly bonded to the base material. The peeling strength of the comparative examples is low, meaning that delamination and peeling are more likely to occur during use.

[0135] Micro-morphology observation and component analysis results show that the microstructure of the antistatic layer of the examples is relatively uniform and dense, and the components are present as expected and react well. The comparative examples have problems such as uneven structure, uneven component distribution, and insufficient reaction.

[0136] The traditional anti-static layer has many deficiencies in anti-static effect, mechanical property, chemical stability, combination with the substrate and microstructure, etc.

[0137] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences, modifications, replacements and variations of the embodiments of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A high-reliability electromagnetic shielding antistatic bag sealing packaging, comprising two sets of polylactic acid fiber woven layers (1), characterized in that: A bio-based conductive polymer electromagnetic shielding layer (5) is provided on one side of the polylactic acid fiber woven layer (1). A natural rubber hemp fiber reinforcing layer (6) is provided on one side of the bio-based conductive polymer electromagnetic shielding layer (5). A chitosan modified antistatic layer (7) is provided on one side of the natural rubber hemp fiber reinforcing layer (6). A starch-based sealing material layer (8) is provided on one side of the chitosan modified antistatic layer (7). A bag cavity (2) is provided on one side of the starch-based sealing material layer (8). A double convex rib (4) is provided on one side of the starch-based sealing material layer (8). A double concave rib (3) is provided on the other side of the starch-based sealing material layer (8). A groove is provided inside the double concave rib (3). The double convex rib (4) engages with the groove of the double concave rib (3).

2. The high-reliability electromagnetic shielding antistatic bag sealing packaging according to claim 1, characterized in that: The chitosan-modified antistatic layer (7) is made from the following raw materials in parts by weight: 3-6 parts chitosan, 1-3 parts oleic acid, 2-4 parts silica sol, 20-30 parts deionized water, 1-4 parts titanate coupling agent, 1-3 parts polydopamine, 0.1-0.5 parts dibutyltin dilaurate, 1-2 parts nano titanium dioxide, and 0.5-2 parts glutaraldehyde.

3. The high-reliability electromagnetic shielding antistatic bag sealing packaging according to claim 2, characterized in that: The silica sol is prepared from a silicon source, water, acid-base catalysts, surfactants, and dispersants.

4. The high-reliability electromagnetic shielding antistatic bag sealing packaging according to claim 2, characterized in that: The nano-titanium dioxide is prepared from tetrabutyl titanate, water, anhydrous ethanol, and hydrochloric acid.

5. A high-reliability electromagnetic shielding antistatic bag sealing packaging according to claim 2, characterized in that, The preparation process of the chitosan-modified antistatic layer (7) includes the following steps: Raw material preparation: Chitosan, oleic acid, silica sol, deionized water, titanate coupling agent, polydopamine, dibutyltin dilaurate, nano titanium dioxide, and glutaraldehyde are weighed and mixed in proportion to obtain mixed raw materials; Chitosan solution preparation: Add chitosan to deionized water to dissolve the chitosan and obtain a chitosan solution, which is used as the base solution for the reaction; Preparation of mixed solution: Oleic acid, silica sol and titanate coupling agent are added to the chitosan solution under continuous stirring to ensure that the components are fully mixed and homogeneous, forming a chitosan composite mixed solution; Ingredient addition: Polydopamine and nano-titanium dioxide were added sequentially to the chitosan composite mixture solution, and then dibutyltin dilaurate was added as a catalyst to obtain a modified chitosan solution. Cross-linking reaction: Glutaraldehyde is added to the modified chitosan solution to adjust the pH value of the solution, so that cross-linking occurs between chitosan molecules; Preparation of antistatic layer: The cross-linked modified chitosan solution is applied to the surface of the substrate material using a coating process. The coating thickness is controlled to form a chitosan modified antistatic layer on the surface of the substrate material.

6. The high-reliability electromagnetic shielding antistatic bag sealing packaging according to claim 5, characterized in that, In the preparation of raw materials, the chitosan raw material is pre-treated as follows: chitosan raw material with a degree of deacetylation ≥ 85% is selected and pulverized to reduce the particle size of chitosan to between 50-200 mesh, which is then used for subsequent dissolution in deionized water.

7. The high-reliability electromagnetic shielding antistatic bag sealing packaging according to claim 5, characterized in that: In the preparation of the chitosan solution, the reaction temperature is 20-30℃ and the time is 30-60 minutes. This temperature and time range allows chitosan to fully dissolve in deionized water under relatively mild conditions, forming a homogeneous chitosan solution.

8. A high-reliability electromagnetic shielding antistatic bag sealing packaging according to claim 5, characterized in that: In the preparation of the mixed solution, the stirring speed is controlled at 200-400 rpm, the reaction temperature at 40-60℃, and the stirring time at 30-60 minutes to ensure that the materials are fully mixed and form a chitosan composite mixed solution.

9. A high-reliability electromagnetic shielding antistatic bag sealing packaging according to claim 5, characterized in that: During the addition of the components, the heating temperature is controlled at 50-70℃ and the reaction time is 2-4 hours. Within this temperature and time range, the synergistic modification of polydopamine and chitosan, the dispersion and interfacial bonding of nano-titanium dioxide, and the catalytic cross-linking reaction of dibutyltin dilaurate can be achieved.

10. A high-reliability electromagnetic shielding antistatic bag sealing packaging according to claim 5, characterized in that: In the preparation of the antistatic layer, the drying temperature is set at 60-80℃ and the drying time is 12-24 hours, which allows the solvent in the cross-linked modified chitosan solution coated on the surface of the substrate material to fully evaporate.

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