CN118003608B - Preparation method for improving compression resistance of environment-friendly packaging material - Google Patents
Preparation method for improving compression resistance of environment-friendly packaging material Download PDFInfo
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- CN118003608B CN118003608B CN202410242964.0A CN202410242964A CN118003608B CN 118003608 B CN118003608 B CN 118003608B CN 202410242964 A CN202410242964 A CN 202410242964A CN 118003608 B CN118003608 B CN 118003608B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
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Abstract
The invention relates to the technical field of preparation of environment-friendly packaging materials, in particular to a preparation method for improving the compression resistance of the environment-friendly packaging materials, which comprises the following steps: s1: selecting natural cellulose materials, biodegradable plastics and natural adhesives; s2: treating the natural cellulose material selected in S1 with an alkaline substance; s3: modifying the biodegradable plastic selected in the step S1; s4: mixing to form a mixture A; s5: carrying out hot press molding treatment on the mixture A; s6: constructing a three-dimensional cellulose network structure in the semi-finished material; s7: carrying out microwave treatment on the semi-finished product material after hot press molding; s8: and carrying out surface functionalization treatment on the semi-finished product material subjected to microwave treatment. The invention, by combining the natural cellulose material, the modified biodegradable plastic and the innovative process, remarkably improves the compressive strength of the environment-friendly packaging material, maintains the environment-friendly property of the environment-friendly packaging material and provides a sustainable solution for packaging application.
Description
Technical Field
The invention relates to the technical field of preparation of environment-friendly packaging materials, in particular to a preparation method for improving the compression resistance of the environment-friendly packaging materials.
Background
In recent years, along with the enhancement of environmental protection consciousness and the promotion of sustainable development policies, environmental protection packaging materials are widely focused as an important way for reducing environmental pollution and promoting resource recycling, and the materials are usually made of biodegradable plastics, natural cellulose and other renewable resources, so that the dependence on traditional petroleum-based plastics is reduced, the materials have good biodegradability, and the influence on the environment is small.
However, while environmentally friendly packaging materials are excellent in terms of their eco-friendliness, they often are insufficient in terms of physical properties, especially compressive strength, to meet certain packaging requirements, and conventional environmentally friendly packaging materials, such as single biodegradable plastics or cellulosic materials, often have limited their range of application due to insufficient strength.
Therefore, how to improve the compressive strength of the materials without sacrificing the environmental protection property becomes a technical problem to be solved urgently.
Disclosure of Invention
Based on the above purpose, the invention provides a preparation method for improving the compression resistance of the environment-friendly packaging material.
The preparation method for improving the compression resistance of the environment-friendly packaging material comprises the following steps:
s1: selecting natural cellulose materials, biodegradable plastics and natural adhesives according to a preset proportion;
s2: treating the natural cellulose material selected in S1 with an alkaline substance to remove impurities therein, thereby purifying fibers of the natural cellulose;
s3: modifying the biodegradable plastic selected in the step S1;
S4: mixing the treated natural cellulose material, the modified biodegradable plastic and the natural adhesive to form a mixture A;
s5: performing hot press forming treatment on the mixture A at a preset high temperature and high pressure to form a semi-finished product material;
S6: in the hot press forming process, a three-dimensional cellulose network structure is constructed in a semi-finished product material by a fiber crosslinking technology;
s7: carrying out microwave treatment on the semi-finished product material after hot press molding;
s8: and performing surface functionalization treatment on the semi-finished product material subjected to microwave treatment to finally obtain the compression-resistant environment-friendly packaging material finished product.
Further, the preset proportion in the S1 is 40-60% of natural cellulose material, 30-40% of biodegradable plastic and 10-20% of natural adhesive.
Further, the natural cellulose material is bamboo fiber, wood fiber or cotton fiber; the biodegradable plastic is; polylactic acid, polyhydroxyalkanoate or polycaprolactone; the natural adhesive is plant starch-based adhesive, natural rubber or beeswax.
Further, the step S2 specifically includes:
S21: soaking the natural cellulose material selected in the step S1 in warm water, wherein the temperature of the water is specifically controlled to be 30-50 ℃ and the soaking time is 1-2 hours;
S22: soaking the natural cellulose material after soaking treatment in an alkaline solution, wherein the concentration of the alkaline solution is 2-10%, the treatment time is 1-3 hours, and the temperature is controlled at 60-90 ℃ to remove lignin and hemicellulose in cellulose, and the alkaline solution is specifically sodium hydroxide solution or potassium hydroxide solution;
S23: washing the natural cellulose material soaked in the alkaline solution in flowing clean water until the pH value is 6-7, and then removing redundant water by using water removing equipment;
S24: and (3) drying the cleaned natural cellulose material at 80-100 ℃ for 2-4 hours to obtain the purified and dried natural cellulose fiber.
Further, the step S3 specifically includes:
S31: selecting nano filler as a modifier, wherein the addition amount of the modifier is 1-5% of the weight of the biodegradable plastic, and the nano filler is specifically carbon nano tubes or nano silicon particles;
S32: uniformly mixing the biodegradable plastic selected in the step S1 with a modifier;
s33: carrying out melt blending treatment at high temperature, wherein the treatment temperature is controlled above the melting point of the biodegradable plastic, the treatment temperature is specifically 150-200 ℃, and the treatment time is 30-60 minutes;
s34: the blended molten mass was cooled to room temperature and granulated by a granulator.
Further, the step S4 specifically includes:
S41: firstly, primarily mixing the natural cellulose material treated in the step S2 and the modified biodegradable plastic in the step S3 in a low-speed stirrer, wherein the primary mixing speed is controlled to be 100-200 revolutions per minute, and the time is 10-15 minutes, so as to realize primary uniform mixing;
s42: adding the natural adhesive selected in the step S1 into the premix, increasing the stirring speed to 200-300 rpm, and continuing stirring for 10-20 minutes;
s43: the temperature of the mixing environment is controlled between 25 and 40 ℃ during the whole mixing process.
Further, the step S5 specifically includes:
s51: firstly preheating the mixture A formed in the step S4 in a heating device, wherein the preheating temperature is controlled to be 100-120 ℃ and the preheating time is 10-15 minutes;
S52: transferring the preheated mixture A into a hot press forming machine, and forming at a controlled high temperature and a controlled high pressure, wherein the forming temperature is controlled to be 140-180 ℃, the pressure is 5-10 MPa, and the forming time is 20-30 minutes, so that the required shape and size are formed;
s53: and after the molding is finished, naturally cooling the semi-finished product material to the normal temperature at the room temperature.
Further, the step S6 specifically includes:
S61: selecting a proper cross-linking agent for promoting cross-linking among cellulose fibers, wherein the cross-linking agent is epoxy resin or isocyanate;
S62: at the initial stage of the hot press molding process, a cross-linking agent is added to the mixture a in an amount of 2 to 5% by weight of the total weight of the mixture a and stirred, so as to ensure efficient construction of the three-dimensional cellulose network structure.
Further, the step S7 specifically includes:
S71: setting processing parameters of microwave equipment, including microwave frequency and power, wherein the microwave frequency is set to be 2.45 GHz, and the power is controlled to be 5-10 kW;
S72: placing the semi-finished product material after hot press molding into microwave equipment, and carrying out microwave treatment for 5-10 minutes;
s73: continuously monitoring the temperature of the semi-finished product material in the microwave treatment process, and ensuring uniform heating and not exceeding a set temperature of 100 ℃;
S74: after the microwave treatment is completed, the material is naturally cooled to the normal temperature at the room temperature, so that the stabilization of the material is completed.
Further, the step S8 specifically includes:
S81: firstly, selecting a proper surface treating agent according to the required surface characteristics, specifically selecting a silane compound for the waterproof performance; for enhancing the wear resistance, selecting a coating of nanoparticles; for antibacterial properties, silver nanoparticle antibacterial agents are selected;
S82: uniformly coating the selected surface treating agent on the surface of the semi-finished product material after microwave treatment, wherein the coating thickness is controlled to be 50-200 microns;
S83: after coating, the material is placed in a preset environment for curing and drying, the curing and drying temperature is controlled at 30-60 ℃ and the time is 2-4 hours.
The invention has the beneficial effects that:
according to the invention, through carefully selected material combination and innovative preparation steps, particularly the three-dimensional cellulose network structure constructed in the hot press molding process, the overall strength of the material is greatly enhanced, so that the final packaging material not only has good environmental protection property, but also can meet the packaging requirement of higher strength, and the practicability and durability of the material are greatly improved.
The invention makes great progress in improving the strength of the material, but still maintains the environmental protection property of the material, all the selected raw materials, such as biodegradable plastic and natural cellulose materials, come from sustainable sources, ensure the biodegradability and environmental friendliness of the material, and is particularly important for modern society pursuing environmental protection and sustainable development.
The invention provides new possibilities for various packaging applications, and the material is particularly suitable for packaging fields requiring high strength and environmental friendliness, such as electronic product packaging, food packaging, transportation packaging and the like, so that the compression-resistant environment-friendly packaging material not only helps to improve the performance of the packaging material, but also provides a new sustainable development direction for the packaging industry.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a preparation method for improving the compression resistance of an environment-friendly packaging material according to an embodiment of the invention.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items.
Example 1:
as shown in fig. 1, a preparation method for improving the compression resistance of an environment-friendly packaging material comprises the following steps:
s1: selecting natural cellulose materials, biodegradable plastics and natural adhesives according to a preset proportion;
s2: treating the natural cellulose material selected in S1 with an alkaline substance to remove impurities such as lignin and hemicellulose therein, thereby purifying fibers of the natural cellulose;
S3: modifying the biodegradable plastic selected in the step S1, and enhancing the compression resistance of the biodegradable plastic and the compatibility with the natural cellulose material;
S4: mixing the treated natural cellulose material, the modified biodegradable plastic and the natural adhesive to form a mixture A;
s5: performing hot press forming treatment on the mixture A at a preset high temperature and high pressure to form a semi-finished product material;
S6: in the hot press forming process, a three-dimensional cellulose network structure is constructed in a semi-finished product material by a fiber crosslinking technology, so that the compressive strength and durability of the material are remarkably improved;
S7: carrying out microwave treatment on the semi-finished product material after hot press molding, and further improving the cohesive force and the overall strength of the material;
s8: and performing surface functionalization treatment on the semi-finished product material subjected to microwave treatment to finally obtain the compression-resistant environment-friendly packaging material finished product.
The preset proportion in S1 is 50% of natural cellulose material, 35% of biodegradable plastic and 15% of natural adhesive.
The natural cellulose material is bamboo fiber; the biodegradable plastic is; polylactic acid; the natural binder is a vegetable starch-based binder.
S2 specifically comprises:
s21: soaking the natural cellulose material selected in the step S1 in warm water, wherein the temperature of the water is specifically controlled to be 40 ℃, and the soaking time is 1.5 hours so as to remove impurities on the surface of cellulose and enhance the treatability of fibers;
s22: soaking the natural cellulose material after soaking treatment in an alkaline solution, wherein the concentration of the alkaline solution is 5%, the treatment time is 2 hours, and the temperature is controlled at 80 ℃ so as to remove lignin and hemicellulose in cellulose, and the alkaline solution is specifically sodium hydroxide solution;
S23: washing the natural cellulose material soaked in alkaline solution in flowing clear water until the pH value is 6.5, and then removing excessive water by using water-separating equipment (such as a centrifugal dehydrator);
S24: and (3) drying the cleaned natural cellulose material at 90 ℃ for 3 hours to obtain the purified and dried natural cellulose fiber.
S3 specifically comprises:
S31: selecting nano filler as a modifier, wherein the addition amount of the modifier is 3% of the weight of the biodegradable plastic, and the nano filler is specifically nano silicon particles;
S32: uniformly mixing the biodegradable plastic selected in the step S1 with the modifier to ensure that the modifier is uniformly distributed in the biodegradable plastic;
S33: carrying out melt blending treatment at high temperature, wherein the treatment temperature is controlled above the melting point of the biodegradable plastic, the treatment temperature is specifically 180 ℃, and the treatment time is 45 minutes, so as to realize the full fusion of the modifier and the biodegradable plastic;
S34: the blended molten material is cooled to room temperature and granulated by a granulator to facilitate subsequent processing and application.
S4 specifically comprises the following steps:
S41: firstly, primarily mixing the natural cellulose material treated in the step S2 and the modified biodegradable plastic in the step S3 in a low-speed stirrer, wherein the primary mixing speed is controlled to be 150 revolutions per minute, and the time is 13 minutes, so as to realize primary uniform mixing;
S42: adding the natural adhesive selected in the step S1 into the premix, increasing the stirring speed to 250 revolutions per minute, and continuing stirring for 15 minutes;
s43: throughout the mixing process, the temperature of the mixing environment is controlled at 30 ℃ to prevent premature curing or property changes of the materials.
S5 specifically comprises the following steps:
s51: firstly preheating the mixture A formed in the step S4 in a heating device, controlling the preheating temperature at 110 ℃ and the preheating time at 13 minutes, so as to prepare materials for hot press molding;
S52: transferring the preheated mixture A into a hot press forming machine, and forming at a controlled high temperature and high pressure, specifically, the forming temperature is controlled to 160 ℃, the pressure is controlled to 7 MPa, and the forming time is 25 minutes, so as to form the required shape and size;
S53: and after the molding is finished, naturally cooling the semi-finished material to the normal temperature at the room temperature so as to realize solidification and stabilization of the material.
S6 specifically comprises the following steps:
s61: selecting a proper cross-linking agent for promoting cross-linking among cellulose fibers, wherein the cross-linking agent is epoxy resin;
S62: in the initial stage of the hot press molding process, a cross-linking agent is added to the mixture a and stirred, the addition amount of the cross-linking agent is 3% of the total weight of the mixture a, and the cross-linking agent is fully contacted and dispersed with the mixture a to ensure the effective construction of the three-dimensional cellulose network structure.
S7 specifically comprises the following steps:
S71: setting processing parameters of microwave equipment, including microwave frequency and power, wherein the microwave frequency is set to be 2.45 GHz, and the power is controlled to be 8 kW;
S72: placing the semi-finished product material after hot press molding into microwave equipment, and carrying out microwave treatment for 8 minutes;
s73: continuously monitoring the temperature of the semi-finished product material in the microwave treatment process, and ensuring uniform heating and not exceeding a set temperature of 100 ℃;
S74: after the microwave treatment is completed, the material is naturally cooled to the normal temperature at the room temperature, so that the stabilization of the material is completed.
S8 specifically comprises the following steps:
S81: firstly, selecting a proper surface treating agent according to the required surface characteristics, specifically selecting a silane compound for the waterproof performance;
s82: uniformly coating the selected surface treating agent on the surface of the semi-finished product material after microwave treatment, wherein the coating thickness is controlled to be 100 micrometers;
S83: after coating, the material was cured and dried in a predetermined environment at a temperature of 40 ℃ for 3 hours.
Example 2:
s1: preparing raw materials, namely, selecting 40% of wood fiber, 40% of polyhydroxyalkanoate and 20% of natural rubber as raw materials;
S2: soaking wood fiber in 30 deg.c warm water for 1 hr, treating in 2% concentration potassium hydroxide solution for 2 hr, maintaining at 60 deg.c, flushing in flowing water to pH 6, and drying at 80 deg.c for 2 hr;
s3: carbon nanotubes (1% of the weight of polyhydroxyalkanoate) are used as a modifier, blended with polyhydroxyalkanoate for 30 minutes at 150 ℃, and then cooled into particles;
s4: mixing the treated wood fiber and the modified polyhydroxyalkanoate for 10 minutes at a stirring speed of 100 revolutions per minute, adding the adhesive, increasing the stirring speed to 200 revolutions per minute, continuing stirring for 10 minutes, and keeping the mixing temperature at 25 ℃;
s5: preheating the mixture at 100 ℃ for 10 minutes, and then hot-press molding for 20 minutes under the conditions of 140 ℃ and 5 MPa;
s6: in the initial stage of hot press molding, isocyanate (2% of the total weight of the mixture) is added to the mixture as a crosslinking agent;
S7: carrying out microwave treatment, specifically treating the mixture in a microwave device of 2.45 GHz and 5 kW for 5 minutes, and ensuring that the temperature of the material does not exceed 100 ℃;
S8: carrying out surface functionalization treatment, specifically using nano-particle paint as a surface treating agent, coating the nano-particle paint with the thickness of 50 microns, and then solidifying and drying the nano-particle paint at the temperature of 30 ℃ for 2 hours to finally obtain the compression-resistant environment-friendly packaging material finished product.
Example 3:
S1: preparing raw materials, namely, selecting 60% of cotton fibers, 30% of polycaprolactone and 10% of beeswax as raw materials;
s2: soaking cotton fiber in 50 deg.c warm water for 2 hr, treating in 10% concentration potassium hydroxide solution for 3 hr, maintaining at 90 deg.c, flushing in flowing clear water to pH 7, and drying at 100 deg.c for 4 hr;
S3: taking or nano silicon particles (accounting for 5 percent of the weight of the polycaprolactone) as a modifier, blending with the polycaprolactone at 200 ℃ for 60 minutes, and then cooling into particles;
S4: mixing the treated cotton fiber and modified polycaprolactone for 15 minutes at a stirring speed of 200 revolutions per minute, adding an adhesive, increasing the stirring speed to 300 revolutions per minute, continuing stirring for 20 minutes, and keeping the mixing temperature at 40 ℃;
S5: preheating the mixture at 120 ℃ for 15 minutes, and then hot-press molding for 30 minutes under the conditions of 180 ℃ and 10 MPa;
S6: in the initial stage of hot press molding, epoxy resin (accounting for 5 percent of the total weight of the mixture) is added into the mixture to serve as a cross-linking agent;
S7: performing microwave treatment, specifically treating the mixture in a microwave device of 2.45 GHz and 10 kW for 10 minutes, to ensure that the temperature of the material does not exceed 100 ℃;
s8: carrying out surface functionalization treatment, specifically using silver nanoparticle antibacterial agent as surface treatment agent, coating with thickness of 200 μm, and then solidifying and drying at 60deg.C for 4 hours to obtain the final product of compression-resistant environment-friendly packaging material.
Table 1 comparison of compression resistant environmental packaging Material finished product Performance parameters
| Performance index | Example 1 | Example 2 | Example 3 |
| Compressive strength (MPa) | 15 | 10.5 | 9 |
| Flexural strength (MPa) | 12 | 8 | 7.5 |
| Water absorption (%) | 5 | 8 | 10 |
| Biodegradation Rate (%) | 90 | 85 | 80 |
| Heat resistance (° C) | 110 | 100 | 95 |
| Wear resistance | High height | In (a) | Low and low |
| Antibacterial property | Good quality | In general | Excellent and excellent properties |
As can be seen from table 1 above, the environment-friendly packaging material of example 1 is superior to example 2 and example 3 in various performance indexes, and in particular, the material of example 1 exhibits higher compressive strength and flexural strength, which means that it is more suitable for withstanding larger forces without cracking or deforming, and is particularly suitable for heavy goods packaging, and furthermore, the water absorption rate of example 1 is lower, which means that it is more resistant to moisture, protects the package contents from the moisture environment, and has a high biodegradation rate, meaning that the material of example 1 is more environment-friendly and can be decomposed in the natural environment more quickly; the heat resistance and abrasion resistance of example 1 also perform best, which is particularly important for articles that require long storage or transportation in harsh environments, while the material of example 3 performs better in terms of antimicrobial properties, example 1 is still the best choice when considering other key performance criteria in combination.
Table 2 comparison of other performance parameters
| Performance index | Example 1 | Example 2 | Example 3 |
| Thermal stability (°c) | 120 | 100 | 80 |
| Degradation period (moon) | 6 | 12 | 24 |
| UV resistance | 90% UV blocking | 60% UV blocking | 30% UV blocking |
| Flexibility (number of bends) | 5000 Times | 2000 Times | 3000 Times |
| Insulation (resistivity) | 10^12 Ω·cm | 10^14 Ω·cm | 10^10 Ω·cm |
| Flame retardancy (flame retardant grade) | V-0 level | V-2 stage | V-0 level |
From table 2 above, it can be seen that example 1 remains stable at temperatures up to 120 ℃ far in excess of examples 2 and 3, is suitable for high temperature environments, the materials of example 1 are completely degradable within 6 months, is significantly more environmentally friendly than the other two examples, example 1 is able to block 90% of UV light, is more effective for protecting the contents from UV damage, the materials of example 1 can be bent up to 5000 times without breaking, exhibits excellent flexibility, while the resistivity of example 2 is highest, but example 1 also has good insulation properties sufficient to meet most packaging requirements, and examples 1 and 3 reach the highest fire retardant rating V-0, indicating that they are highly safe in fire.
In summary, the environmental packaging material of example 1 performs best in terms of overall performance, its high performance and environmental suitability make it an ideal choice for wide application in various packaging requirements, it not only meets the strength and durability requirements, but also provides additional advantages in terms of environmental friendliness and safety.
The present invention is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.
Claims (1)
1. The preparation method for improving the compression resistance of the environment-friendly packaging material is characterized by comprising the following steps of:
s1: selecting natural cellulose materials, biodegradable plastics and natural adhesives according to a preset proportion;
S2: treating the natural cellulose material selected in S1 with an alkaline substance;
s3: modifying the biodegradable plastic selected in the step S1;
S4: mixing the treated natural cellulose material, the modified biodegradable plastic and the natural adhesive to form a mixture A;
s5: performing hot press forming treatment on the mixture A at a preset high temperature and high pressure to form a semi-finished product material;
S6: in the hot press forming process, a three-dimensional cellulose network structure is constructed in a semi-finished product material by a fiber crosslinking technology;
s7: carrying out microwave treatment on the semi-finished product material after hot press molding;
s8: performing surface functionalization treatment on the semi-finished product material subjected to microwave treatment to finally obtain a compression-resistant environment-friendly packaging material finished product;
The preset proportion in S1 is that natural cellulose material accounts for 50%, biodegradable plastic accounts for 35%, and natural adhesive accounts for 15%;
The natural cellulose material is bamboo fiber; the biodegradable plastic is; polylactic acid; the natural adhesive is a plant starch-based adhesive;
s2 specifically comprises:
s21: soaking the natural cellulose material selected in the step S1 in warm water, wherein the temperature of the water is specifically controlled to be 40 ℃, and the soaking time is 1.5 hours so as to remove impurities on the surface of cellulose and enhance the treatability of fibers;
s22: soaking the natural cellulose material after soaking treatment in an alkaline solution, wherein the concentration of the alkaline solution is 5%, the treatment time is 2 hours, and the temperature is controlled at 80 ℃ so as to remove lignin and hemicellulose in cellulose, and the alkaline solution is specifically sodium hydroxide solution;
s23: washing the natural cellulose material soaked in the alkaline solution in flowing clean water until the pH value is 6.5, and then removing redundant water by using water removing equipment;
S24: drying the cleaned natural cellulose material at 90 ℃ for 3 hours to obtain purified and dried natural cellulose fibers;
S3 specifically comprises:
S31: selecting nano filler as a modifier, wherein the addition amount of the modifier is 3% of the weight of the biodegradable plastic, and the nano filler is specifically nano silicon particles;
S32: uniformly mixing the biodegradable plastic selected in the step S1 with a modifier;
s33: carrying out melt blending treatment at high temperature, wherein the treatment temperature is controlled above the melting point of the biodegradable plastic, the treatment temperature is specifically 180 ℃, and the treatment time is 45 minutes;
S34: cooling the blended molten material to room temperature, and granulating by a granulator;
s4 specifically comprises the following steps:
S41: firstly, primarily mixing the natural cellulose material treated in the step S2 and the modified biodegradable plastic in the step S3 in a low-speed stirrer, wherein the primary mixing speed is controlled to be 150 revolutions per minute, and the time is 13 minutes, so as to realize primary uniform mixing;
S42: adding the natural adhesive selected in the step S1 into the premix, increasing the stirring speed to 250 revolutions per minute, and continuing stirring for 15 minutes;
s43: in the whole mixing process, controlling the temperature of the mixing environment at 30 ℃;
S5 specifically comprises the following steps:
s51: firstly preheating the mixture A formed in the step S4 in a heating device, controlling the preheating temperature at 110 ℃ and the preheating time at 13 minutes, so as to prepare materials for hot press molding;
S52: transferring the preheated mixture A into a hot press forming machine, and forming at a controlled high temperature and high pressure, specifically, the forming temperature is controlled to 160 ℃, the pressure is controlled to 7 MPa, and the forming time is 25 minutes, so as to form the required shape and size;
S53: naturally cooling the semi-finished product material to normal temperature at room temperature after the molding is finished;
s6 specifically comprises the following steps:
s61: selecting a proper cross-linking agent for promoting cross-linking among cellulose fibers, wherein the cross-linking agent is epoxy resin;
S62: in the initial stage of the hot press forming process, adding a cross-linking agent into the mixture A, stirring, wherein the adding amount of the cross-linking agent is 3% of the total weight of the mixture A, and fully contacting and dispersing the cross-linking agent and the mixture A;
S7 specifically comprises the following steps:
S71: setting processing parameters of microwave equipment, including microwave frequency and power, wherein the microwave frequency is set to be 2.45 GHz, and the power is controlled to be 8 kW;
S72: placing the semi-finished product material after hot press molding into microwave equipment, and carrying out microwave treatment for 8 minutes;
s73: continuously monitoring the temperature of the semi-finished product material in the microwave treatment process, and ensuring uniform heating and not exceeding a set temperature of 100 ℃;
S74: after the microwave treatment is finished, naturally cooling the material to the normal temperature at the room temperature to finish the stabilization of the material;
s8 specifically comprises the following steps:
S81: firstly, selecting a proper surface treating agent according to the required surface characteristics, specifically selecting a silane compound for the waterproof performance;
s82: uniformly coating the selected surface treating agent on the surface of the semi-finished product material after microwave treatment, wherein the coating thickness is controlled to be 100 micrometers;
S83: after coating, placing the material in a preset environment for curing and drying, wherein the curing and drying temperature is controlled at 40 ℃ and the time is 3 hours;
The thermal stability of the finished product of the environment-friendly packaging material is 120 ℃, the degradation period is 6 months, the UV resistance is 90 percent of UV blocking, the bending times under the condition of no fracture are 5000 times, the resistivity is 10-12 ohm cm, and the flame retardant grade is V-0 grade;
The compression strength of the finished product of the environment-friendly packaging material is 15MPa, the flexural strength is 12MPa, the water absorption is 5%, the biodegradation rate is 90%, and the heat resistance is 110 ℃.
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