Bio-based barrier composition and method for its preparation, composition for the preparation of pulp molded articles and pulp molded articles

Abstract

The application relates to a bio-based barrier composition and a preparation method thereof, a composition for preparing a pulp molded product and the pulp molded product. The bio-based barrier composition comprises the following components in parts by weight: micro-nano cellulose, 100 parts; biological wax, 12.5-40 parts; biodegradable polysaccharide polymer, 3.3-8 parts; biodegradable polyester, 8.3-25 parts; compatilizer, 0.58-2.5 parts; dispersant, 241-600 parts; and water, 391-650 parts. The bio-based barrier composition can simplify the process of making the pulp molded product with barrier performance and improve the environmental performance and barrier performance of the pulp molded product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulp molded products, in particular, to a bio-based barrier composition, a preparation method thereof, a composition for preparing a pulp molded product and the pulp molded product. BACKGROUND

[0002] The pulp molded product can accommodate the packaged product, and reduce the probability of damage during transportation, loading and unloading, and use. With the development of pulp molding manufacturing technology, the performance can be improved for different packaging requirements of products, such as barrier performance. Better barrier performance can protect the packaged product and reduce the adverse effects of external factors on the packaged product. In addition, the environmental performance of the pulp molded product is also a performance worth considering for improvement. Therefore, it is urgent to improve the barrier performance and environmental performance of the pulp molded product.

[0003] However, in the related art, the pulp molded product needs to be treated by a special process to form a coating layer with barrier performance on the surface thereof, and the barrier aid used in the coating layer can cause the environmental performance of the pulp molded product to decrease. In addition, the barrier performance of the pulp molded product needs to be improved. SUMMARY

[0004] The present application provides a bio-based barrier composition, a preparation method thereof, a composition for preparing a pulp molded product and the pulp molded product, which can simplify the process of the pulp molded product having barrier performance and improve the environmental performance and barrier performance of the pulp molded product.

[0005] In a first aspect, the present application provides a bio-based barrier composition, which comprises the following components in terms of weight fraction:

[0006] Micro-nano cellulose, 100 parts;

[0007] Biological wax, 12.5 parts to 40 parts;

[0008] Biodegradable polysaccharide polymer, 3.3 parts to 8 parts;

[0009] Biodegradable polyester, 8.3 parts to 25 parts;

[0010] Compatibility agent, 0.58 parts to 2.5 parts;

[0011] Dispersant, 241 parts to 600 parts;

[0012] Water, 391 parts to 650 parts.

[0013] In the bio-based barrier composition provided in the application, by reasonably selecting the components and matching the content, the bio-based barrier composition can have biodegradability, and at the same time, can be directly added to the pulp for preparing a pulp molded product, so as to simplify the process of the pulp molded product having barrier performance, and improve the barrier performance of the pulp molded product. Therefore, the bio-based barrier composition provided in the application can simplify the process of the pulp molded product having barrier performance, and improve the environmental protection performance and barrier performance of the pulp molded product.

[0014] According to any of the foregoing embodiments of the first aspect of the application, the bio-based barrier composition comprises the following components:

[0015] micro-nano cellulose, 100 parts;

[0016] biological wax, 30-33 parts;

[0017] biodegradable polysaccharide polymer, 6-8 parts;

[0018] biodegradable polyester, 20-25 parts;

[0019] compatibility agent, 0.88-2.15 parts;

[0020] dispersant, 300-400 parts;

[0021] water, 600-650 parts.

[0022] According to any of the foregoing embodiments of the first aspect of the application, the biodegradable polysaccharide polymer comprises chitosan;

[0023] and / or, the weight average molecular weight of the chitosan is 200-500 thousand;

[0024] and / or, the degree of deacetylation of the chitosan is greater than or equal to 85%.

[0025] According to any of the foregoing embodiments of the first aspect of the application, the biodegradable polyester comprises one or more of polyhydroxyalkanoate, poly-3-hydroxybutyrate, poly(3-hydroxybutyrate-3-hydroxyvalerate), polyhydroxybutyric acid hexanoate and polyethylene adipate.

[0026] According to any of the foregoing embodiments of the first aspect of the application, the biological wax comprises one or more of white beeswax, yellow beeswax, insect white wax, palm wax, soybean wax and candelilla wax.

[0027] According to any of the foregoing embodiments of the first aspect of the application, the compatibility agent comprises a calcium salt;

[0028] Optionally, the compatibility agent comprises one or more of calcium chloride and calcium stearate;

[0029] Optionally, the compatibilizer includes 0.33 parts to 1 part of calcium chloride and 0.25 parts to 1.5 parts of calcium stearate, based on 100 parts by weight of the micro-nano cellulose.

[0030] According to any of the foregoing embodiments of the first aspect of the present application, the dispersant includes one or more of glacial acetic acid and ethanol;

[0031] Optionally, the dispersant includes 158 parts to 300 parts of glacial acetic acid and 83 parts to 300 parts of ethanol, based on 100 parts by weight of the micro-nano cellulose.

[0032] In a second aspect, the present application provides a method for preparing the bio-based barrier composition according to the first aspect of the present application, comprising:

[0033] dispersing the bio-wax and part of the compatibilizer in the solvent and performing a first water bath treatment to obtain a bio-wax dispersion;

[0034] mixing the bio-wax dispersion, part of the biodegradable polysaccharide polymer, and part of the dispersant and performing a second water bath treatment to obtain a first mixed solution;

[0035] mixing the biodegradable polyester with the remaining part of the biodegradable polysaccharide polymer, the compatibilizer, and the dispersant to obtain a second mixed solution;

[0036] adding the first mixed solution and the second mixed solution to the solvent in which the micro-nano cellulose is dispersed and mixing to obtain the bio-based barrier composition.

[0037] In a third aspect, the present application provides a composition for preparing a pulp molded product, comprising, calculated on the basis of 100% by mass fraction of the composition for preparing a pulp molded product:

[0038] oven-dry pulp, 0.1% to 3%;

[0039] water, 92.5% to 97.5%;

[0040] additives, 0.15% to 4.5%;

[0041] The additives include the bio-based barrier composition according to the first aspect of the present application or the bio-based barrier composition prepared by the method according to the second aspect of the present application.

[0042] In a fourth aspect, the present application provides a pulp molded product prepared using the composition for preparing a pulp molded product according to the third aspect of the present application.

[0043] According to any of the foregoing embodiments of the fourth aspect of the present application, the water vapor transmission at 38°C and 90% RH per 100 μm thickness of the pulp molded product is less than or equal to 200 g / m 2• day;

[0044] Optionally, the water vapor transmission at 38°C, 90% RH of the pulp molded article per 100 pm thickness is in the range of 120 g / m 2 • day ~ 200 g / m 2 • day.

[0045] In a fifth aspect, the present application provides a method for manufacturing the pulp molded article according to the fourth aspect of the present application, comprising:

[0046] dispersing the additive containing the bio-based barrier composition and the bone-dry pulp in water and heating and stirring to obtain a pulp slurry;

[0047] subjecting the pulp slurry to suction, molding, hot pressing and drying to obtain the pulp molded article. DETAILED DESCRIPTION

[0048] Where a composition is described as including or comprising specific components, it is contemplated that the composition can also consist of or consist essentially of the recited components, and that the composition can also include or comprise optional components in addition to the recited components, and that the method can also consist of or consist essentially of the recited steps, or that the method can also include or comprise optional steps in addition to the recited steps.

[0049] The terms "optional" and "optionally" mean that in certain situations some benefit or benefit range can be provided by the present application. However, in the same or other situations, other embodiments can not provide any benefit or only a different benefit than other embodiments. Moreover, the recitation of one or more optional embodiments does not indicate that other embodiments are not useful, and is not intended to exclude those other embodiments from the scope of the application.

[0050] As used herein, "a," "an," "the," and "at least one" are used interchangeably and mean one or more than one. For example, a coating composition includes "a" additional additive can be interpreted to mean that the coating composition includes "one or more" additional additives.

[0051] For convenience, some numerical ranges are disclosed herein in terms of "ranges" and "ranges of ranges." However, when no explicit recitation of a specific number within the range, it should be understood that any number within the range can be "combined" with any other number to achieve a still further range. For example, a range of "1 to 10" can be achieved by combining the lower end of the range "1" with the upper end of another range "10". Further, any numerical range can be achieved by combining any lower end of the range with any upper end of the range.

[0052] The above summary of the application is not intended to describe each disclosed embodiment or every implementation thereof. The description that follows more particularly exemplifies illustrative embodiments. In several places throughout the application, guidance is provided through a series of examples, which can be used in various combinations. In each of the various examples, the recited list of items is not to be construed as read as "one and only one" but rather as "one or more." There is no limitation on the combinations of items in that all possible combinations are explicitly contemplated unless the context clearly dictates otherwise.

[0053] As described in the above background, pulp molded products can contain and protect the packaged products, in order to better protect the packaged products, the pulp molded products usually form a barrier coating on the surface thereof, which is formed by spraying, doctoring, dipping and the like process. However, the barrier aid used in the barrier coating can cause the environmental performance of the pulp molded product to decrease. In addition, the barrier performance of the pulp molded product needs to be improved.

[0054] In the present application, the pulp molded product can be a color box, a gift box, a carton, a paper tray, and a smart package, an environmentally friendly package, a functional package and the like product, which is not particularly limited in the embodiments of the present application.

[0055] Bio-based barrier composition

[0056] In a first aspect, the present application provides a bio-based barrier composition, comprising the following components in terms of weight fraction:

[0057] Micro-nano cellulose, 100 parts;

[0058] Bio-wax, 12.5 parts to 40 parts;

[0059] Biodegradable polysaccharide polymer, 3.3 parts to 8 parts;

[0060] Biodegradable polyester, 8.3 parts to 25 parts;

[0061] Compatibility agent, 0.58 parts to 2.5 parts;

[0062] Dispersant, 241 parts to 600 parts;

[0063] Water, 391 parts to 650 parts.

[0064] In the bio-based barrier composition provided in the present application, by reasonably selecting the components and matching the content, the bio-based barrier composition can have biodegradability, and at the same time, it can be directly added to the pulp for preparing the pulp molded product, thereby simplifying the process of the pulp molded product having barrier performance, and improving the barrier performance of the pulp molded product. Therefore, the bio-based barrier composition provided in the present application can simplify the process of the pulp molded product having barrier performance, and improve the environmental performance and barrier performance of the pulp molded product.

[0065] In some embodiments of the present application, the bio-based barrier composition comprises the following components:

[0066] micro-nano cellulose, 100 parts;

[0067] bio-wax, 30-33 parts;

[0068] biodegradable polysaccharide polymer, 6-8 parts;

[0069] biodegradable polyester, 20-25 parts;

[0070] compatibility agent, 0.88-2.15 parts;

[0071] dispersant, 300-400 parts;

[0072] water, 600-650 parts.

[0073] In the present application, the biodegradable polysaccharide polymer can help disperse the bio-wax and also help improve the stability of the bio-wax in the bio-based barrier composition to improve the barrier performance of the pulp molded product.

[0074] In some embodiments of the present application, the biodegradable polysaccharide polymer comprises one or more of chitosan, starch, and alginate. Among them, chitosan has hydroxyl and amino groups, which can further improve the dispersibility of the bio-wax and the stability of the bio-wax in the bio-based barrier composition.

[0075] In some embodiments of the present application, the weight average molecular weight of chitosan is 200-500 thousand. When the weight average molecular weight of chitosan is in the above suitable range, it can help improve its dispersibility and the barrier performance of the bio-based barrier composition to improve the barrier performance of the pulp molded product.

[0076] For example, the weight average molecular weight of chitosan can be, but is not limited to, 200,000, 210,000, 220,000, 230,000, 240,000, 250,000, 260,000, 270,000, 280,000, 290,000, 300,000, 310,000, 320,000, 330,000, 340,000, 350,000, 360,000, 370,000, 380,000, 390,000, 400,000, 410,000, 420,000, 430,000, 440,000, 450,000, 460,000, 470,000, 480,000, 490,000, 500,000, or a range formed by any two of the above values, for example, the weight average molecular weight of chitosan can be, but is not limited to, 210,000-480,000, 250,000-450,000, 300,000-400,000.

[0077] In some embodiments of the present application, the degree of deacetylation of chitosan is greater than or equal to 85%.

[0078] In some embodiments of the present application, the biodegradable polyester includes one or more of polyhydroxyalkanoate (PHA), poly(3-hydroxybutyrate) (PHB), poly(3-hydroxybutyrate-3-hydroxyvalerate) (PHBV), poly(hydroxybutyrate-hydroxyhexanoate) (PHBHHx), and poly(ethylene adipate) (PEA).

[0079] In some embodiments of the present application, the biodegradable polyester includes poly(3-hydroxybutyrate-3-hydroxyvalerate) (PHBV), which can help to improve the stability of the bio-wax in the bio-based barrier composition, and also can help the bio-based barrier composition to improve the environmental performance and barrier performance of the pulp molded product.

[0080] In some embodiments of the present application, the bio-wax includes one or more of white beeswax, yellow beeswax, insect wax, palm wax, soybean wax, and candelilla wax.

[0081] In some embodiments of the present application, the compatibilizer includes a calcium salt, which can help to increase the compatibility between other components in the bio-based barrier composition, so as to improve the uniformity of the components in the dispersion system.

[0082] In some embodiments of the present application, the compatibilizer includes one or more of calcium chloride and calcium stearate.

[0083] In some embodiments of the present application, based on 100 parts by weight of the micro-nano cellulose, the compatibilizer includes 0.33 parts to 1 part of calcium chloride and 0.25 parts to 1.5 parts of calcium stearate.

[0084] In some embodiments of the present application, the dispersant includes one or more of glacial acetic acid and ethanol. Among them, the ethanol can be anhydrous ethanol.

[0085] In some embodiments of the present application, based on 100 parts by weight of the micro-nano cellulose, the dispersant includes 158 parts to 300 parts of glacial acetic acid and 83 parts to 300 parts of ethanol.

[0086] In some embodiments of the present application, the component water included in the bio-based barrier composition can be deionized water.

[0087] Method for preparing bio-based barrier composition

[0088] In a second aspect, the present application provides a method for preparing the bio-based barrier composition according to the first aspect of the present application, which includes:

[0089] S10, dispersing the bio-wax and part of the compatibilizer in the solvent and performing a first water bath treatment to obtain a bio-wax dispersion;

[0090] S20, mixing the biological wax dispersion, part of the biodegradable polysaccharide polymer and part of the dispersant and performing a second water bath treatment to obtain a first mixed solution;

[0091] S30, mixing the biodegradable polyester, the remaining part of the biodegradable polysaccharide polymer, the compatibilizer and the dispersant to obtain a second mixed solution;

[0092] S40, adding the first mixed solution and the second mixed solution to the solvent in which the micro-nano cellulose is dispersed to perform a mixing treatment to obtain a bio-based barrier composition.

[0093] In the preparation method provided in the application, the compatibility between the components is good, a dispersion system with good uniformity can be obtained, and the bio-based barrier composition prepared can be mixed with pulp to prepare a pulp molded product, thereby simplifying the process of the pulp molded product with barrier properties and improving the environmental performance and barrier properties of the pulp molded product.

[0094] In some embodiments of the application, the biological wax and part of the compatibilizer are dispersed in a solvent and subjected to a first water bath treatment to obtain a biological wax dispersion, that is, S10 includes:

[0095] S11, dispersing the biological wax and part of the compatibilizer in a solvent and performing a first ultrasonic water bath treatment to obtain a biological wax dispersion; wherein the ultrasonic power is 40W-100W and the ultrasonic time is 30min-60min. The above ultrasonic water bath treatment can help the dispersion of the biological wax.

[0096] In some embodiments of the application, the biological wax dispersion, part of the biodegradable polysaccharide polymer and part of the dispersant are mixed and subjected to a second ultrasonic water bath treatment to obtain a first mixed solution, that is, S20 includes:

[0097] S21, mixing the biological wax dispersion, part of the biodegradable polysaccharide polymer and part of the dispersant and performing a second ultrasonic water bath treatment to obtain a first mixed solution, wherein the ultrasonic power is 40W-100W and the ultrasonic time is 30min-60min

[0098] In some embodiments of the application, the weight average molecular weight of the biodegradable polysaccharide polymer used in S20 and S30 is 200,000-500,000, and the degree of deacetylation is ≥85%.

[0099] In some embodiments of the application, the biodegradable polyester used in S30 includes PHBV, which can help improve the stability of the biological wax in the bio-based barrier composition, and also help the bio-based barrier composition improve the environmental performance and barrier properties of the pulp molded product.

[0100] In the above embodiments, the PHBV can be in powder form, with a fineness of 150 mesh or more, a viscosity average molecular weight of 400,000 or more, and a relative density of 1.22-1.25.

[0101] In some embodiments of the present application, the biodegradable polyester is mixed with the remaining portion of the biodegradable polysaccharide polymer, the compatibilizing agent, and the dispersing agent to obtain a second mixed solution, i.e., S30 includes:

[0102] After mixing the biodegradable polyester with the remaining portion of the biodegradable polysaccharide polymer, the compatibilizing agent, and the dispersing agent, the mixture is placed in a cell crusher for dispersion to obtain a second mixed solution.

[0103] In the above embodiments, the cell crusher has a power of 300W-650W and a processing time of 30min-60min.

[0104] In some embodiments of the present application, the micro-nano cellulose used in S40 can be a water dispersion, with a solid content of 10%±3%.

[0105] Composition for making pulp molded articles

[0106] In a third aspect, the present application provides a composition for preparing a pulp molded product, which includes, calculated on the basis of the mass fraction of the composition for preparing a pulp molded product, 100%:

[0107] Dry pulp, 0.1%-3%;

[0108] Water, 92.5%-97.5%;

[0109] Additives, 0.15%-4.5%;

[0110] The additives include the biobased barrier composition of the first aspect of the present application or the biobased barrier composition prepared by the preparation method of the second aspect of the present application.

[0111] In the composition for preparing a pulp molded product provided by the present application, the biobased barrier composition in the above embodiments can simplify the process of making the pulp molded product have barrier properties and improve the environmental performance and barrier properties of the pulp molded product.

[0112] In the present application, the dry pulp can be selected according to actual application requirements. For example, the dry pulp includes one or more of bamboo pulp, cane pulp, wood pulp, straw pulp, and waste paper pulp.

[0113] Pulp molded articles

[0114] In a fourth aspect, the present application provides a pulp molded product prepared using the composition for preparing a pulp molded product according to the third aspect of the present application.

[0115] In some embodiments of the present application, the pulp molded product has a water vapor transmission rate of 38℃, 90% RH of less than or equal to 200g / m 2 ·day per 100μm thickness. The pulp molded product has a suitable water vapor transmission rate range under the above conditions, which can make it have better barrier properties.

[0116] In the present application, the water vapor transmission rate has the meaning known in the art and can be tested using instruments or methods well known in the art. For example, the water vapor transmission rate is tested using the water vapor transmission rate tester according to the weight loss method in the national standard "GB / T 1037—2021 Determination of water vapor transmission rate of plastic films and sheets Cup method for weight gain and weight loss", including the following steps:

[0117] In a dry and clean moisture permeable cup, distilled water is added, the sample is packaged into the moisture permeable cup, the moisture permeable cup is placed in the test chamber with the cup opening facing upwards, and the chamber door is closed. Set 38℃, 90% RH through the software interface and start the test to obtain the water vapor transmission rate.

[0118] In some embodiments of the present application, the pulp molded product has a water vapor transmission rate of 38℃, 90% RH of 120g / m 2 ·day per 100μm thickness to 200g / m 2 ·day.

[0119] In addition, the pulp molded product can also be tested for its barrier properties by hot oil test and hot water resistance test. For example, the hot oil resistance test is tested according to the hot oil resistance test method in the national standard "GB / T 36787—2018 Pulp molded tableware", including the following steps:

[0120] The sample is placed on a dry glass plate or flat plate lined with filter paper, filled with 95℃±5℃ edible oil, and after standing for 30min, the sample is observed for deformation, and the filter paper is observed for oil leakage.

[0121] The hot water resistance test can be tested according to the hot water resistance test method in the national standard "GB / T 36787—2018 Pulp molded tableware", including the following steps:

[0122] The sample is placed on a dry glass plate or flat plate lined with filter paper, filled with 95℃±5℃ water, and after standing for 30min, the sample is observed for deformation, and the bottom is observed for seepage and leakage.

[0123] The present application provides a method for manufacturing a pulp molded product according to the fourth aspect of the present application, comprising:

[0124] An additive containing a bio-based barrier composition and oven-dry pulp are dispersed in water and heated and stirred to obtain a pulp stock.

[0125] The pulp is subjected to suction, molding, hot pressing and drying processes to obtain pulp molded products.

[0126] Example

[0127] The following embodiments describe the disclosure of this application in more detail. These embodiments are merely illustrative, as various modifications and variations will be apparent to those skilled in the art within the scope of the disclosure of this application. Unless otherwise stated, all parts, percentages, and ratios reported in the following embodiments are based on weight, and all reagents used in the embodiments are commercially available and ready for use without further processing.

[0128] Test section

[0129] (1) Water vapor transmission rate test

[0130] The water vapor transmission rate was tested using a water vapor transmission rate meter according to the weight loss method in the national standard "GB / T 1037—2021 Determination of Water Vapor Transmission Performance of Plastic Films and Sheets - Cup-type Weight Gain and Weight Loss Method", including the following steps:

[0131] Add distilled water to a dry, clean permeation cup, seal the sample onto the permeation cup, place the permeation cup with its opening facing upwards in the test chamber, and close the chamber door. Set the temperature to 38℃ and RH to 90% using the software interface and start the test to obtain the water vapor permeation rate.

[0132] Example 1

[0133] Preparation of bio-based barrier compositions

[0134] 30 parts of beeswax and 0.68 parts of calcium chloride were dispersed in 200 parts of water and subjected to a first ultrasonic water bath treatment to obtain a biological wax dispersion. The temperature of the first ultrasonic water bath was 85℃, the water bath time was 60 min, and the ultrasonic power was 100W.

[0135] The above-mentioned biological wax dispersion, 3 parts chitosan and 90 parts glacial acetic acid were mixed and subjected to a second ultrasonic water bath treatment to obtain a first mixed solution. The temperature of the second ultrasonic water bath was 75°C, the water bath time was 60 min, and the ultrasonic power was 100 W.

[0136] 20 parts of PHBV were mixed with 5 parts of chitosan, 210 parts of glacial acetic acid, 1.25 parts of calcium stearate and 100 parts of anhydrous ethanol, and then dispersed in a cell disruptor to obtain a second mixed solution; the cell disruptor power was 650W and the processing time was 60min.

[0137] The first mixed solution and the second mixed solution are added to 360 parts of water in which 100 parts of micro-nano cellulose is dispersed, and mixed to obtain the bio-based barrier composition.

[0138] Preparation of pulp molded product

[0139] 20 parts of straw pulp, 40 parts of bamboo pulp and 40 parts of cane pulp are defibered into a pulp dispersion with a concentration of 10%, 140 parts of the bio-based barrier composition is added and stirred uniformly, and then diluted with water to a mixed pulp with a concentration of 0.3% (based on the absolute dry pulp). The mixed pulp is transported to a molding machine, and a pulp molded product wet embryo is prepared by vacuum filtration dehydration. The pulp molded wet embryo is dehydrated, hot-pressed and shaped, and then transferred and cut to obtain the pulp molded product.

[0140] Examples 2-10

[0141] The preparation method is similar to that of Example 1, except that the components and contents of the bio-based barrier composition are different.

[0142] Comparative Examples 1-2

[0143] The preparation method is similar to that of Example 1, except that the components and contents of the bio-based barrier composition are different.

[0144] Table 1 lists the components and contents of the bio-based barrier composition and the components and contents of the pulp molded product in each example and comparative example, and the related test results.

[0145]

[0146] According to Table 1, by comparing the test results of Examples 1-10 and Comparative Examples 1-2, it can be seen that by reasonably selecting the components and matching the contents, the bio-based barrier composition can have biodegradability, and can also be directly added to the pulp to prepare the pulp molded product, thereby simplifying the process of making the pulp molded product have barrier properties, and improving the barrier properties of the pulp molded product. Therefore, the bio-based barrier composition provided by the present application can simplify the process of making the pulp molded product have barrier properties, and improve the environmental performance and barrier properties of the pulp molded product.

[0147] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pulp molded product, characterized in that, Prepared using a composition for preparing molded pulp articles, and calculated with the mass fraction of the composition for preparing molded pulp articles being 100%, comprising: Oven-dried pulp, 0.1%~3%; Water, 92.5%~97.5%; Additives, 0.15%~4.5%; wherein, the additives include a bio-based barrier composition, which, by weight, comprises the following components: micro / nano cellulose, 100 parts; bio-wax, 12.5 parts~40 parts, wherein the bio-wax includes one or more of white beeswax, yellow beeswax, insect wax, palm wax, soybean wax, and candelilla wax; biodegradable polysaccharide polymer, 3.3 parts~8 parts; biodegradable polyester, 8.3 parts~25 parts; compatibilizer, 0.58 parts~2.5 parts; dispersant, 241 parts~600 parts; water, 391 parts~650 parts.

2. The pulp molded article according to claim 1, characterized in that, The bio-based barrier composition comprises the following components: Micro-nano cellulose, 100 parts; Bio-wax, 30-33 parts; Biodegradable polysaccharide polymer, 6 to 8 parts; Biodegradable polyester, 20 to 25 parts; Compatibilizer, 0.88 parts to 2.15 parts; Dispersant, 300-400 parts; Water, 600-650 parts.

3. The pulp molded article according to claim 1, characterized in that, The biodegradable polysaccharide polymer includes chitosan; And / or, the weight-average molecular weight of the chitosan is 200,000 to 500,000; And / or, the degree of deacetylation of the chitosan is greater than or equal to 85%.

4. The pulp molded article according to claim 1, characterized in that, The biodegradable polyester includes polyhydroxyalkanoates.

5. The pulp molded article according to claim 1, characterized in that, The biodegradable polyester includes one or more of poly(3-hydroxybutyrate), poly(3-hydroxybutyrate-3-hydroxyvalerate), poly(hydroxybutyrate hexanoate), and polyethylene adipate.

6. The pulp molded article according to claim 1, characterized in that, The compatibilizer includes calcium salts.

7. The pulp molded article according to claim 1, characterized in that, The compatibilizer includes one or more of calcium chloride and calcium stearate; Optionally, based on 100 parts by weight of the micro / nanocellulose, the compatibilizer comprises 0.33 to 1 part of calcium chloride and 0.25 to 1.5 parts of calcium stearate.

8. The pulp molded article according to claim 1, characterized in that, The dispersant includes one or more of glacial acetic acid and ethanol; Optionally, based on 100 parts by weight of the micro / nanocellulose, the dispersant comprises 158 to 300 parts of glacial acetic acid and 83 to 300 parts of ethanol.

9. The pulp molded article according to claim 1, characterized in that, The preparation method of the bio-based barrier composition includes: The biowax and a portion of the compatibilizer were dispersed in a solvent and subjected to a first water bath treatment to obtain a biowax dispersion. The biowax dispersion, a portion of the biodegradable polysaccharide polymer, and a portion of the dispersant are mixed and subjected to a second water bath treatment to obtain a first mixed solution. The biodegradable polyester is mixed with the remaining biodegradable polysaccharide polymer, compatibilizer, and dispersant to obtain a second mixed solution; The first mixed solution and the second mixed solution are added to a solvent containing dispersed micro- and nano-cellulose and mixed to obtain the bio-based barrier composition.

10. The pulp molded article according to claim 1, characterized in that, The water vapor transmission rate of the molded pulp article at 38°C and 90%RH is less than or equal to 200 g / m² per 100 μm thickness. 2 ·day; Optionally, the water vapor transmission rate of the pulp molded article at 38°C and 90%RH per 100μm thickness is in the range of 120 g / m². 2 ·day~200 g / m 2 ·day.

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