Blend and use thereof

Abstract

The present invention relates to the field of food packaging, in particular to a blend and a use thereof. The blend comprises at least: an oil-resistant agent, wherein the oil-resistant agent comprises a fatty acid salt containing 15 to 20 carbon atoms, and the fatty acid salt containing 15 to 20 carbon atoms is preferably a linear fatty acid salt; a stabilizer, wherein the stabilizer comprises a polymer containing repeating units derived from styrene and repeating units derived from an unsaturated carboxylic acid and / or repeating units derived from an unsaturated anhydride; and a cationic starch. The blend of the present invention does not contain any PFAS components, thereby satisfying environmental requirements while avoiding health risks that PFAS may pose. Moreover, the present invention can be applied to a wet end, pertains to a non-surface-treatment process, and better meets oil-resistance requirements for molded fiber-based food packaging. In particular, articles made from the blend of the present invention effectively prevent both high-temperature and low-temperature oil penetration.

Description

Blends and their uses Technical Field

[0001] This invention relates to the field of food packaging, and more specifically to a blend and its uses. Background Technology

[0002] Cellulose-based food packaging (e.g., molded fiber food packaging) is gaining popularity due to its biodegradability, compostability, and sustainability. However, water and / or grease from food can permeate these containers, staining hands, clothing, and surfaces. Existing technologies typically address this issue by coating the surface of these containers with water- and / or grease-repellent materials. Per- and polyfluoroalkyl substances (PFAS) are widely used due to their excellent water and oil repellency. However, PFAS are not easily biodegradable and accumulate in the environment and among the human body, posing health risks.

[0003] Furthermore, due to limitations in the manufacturing process, molded fiber food packaging cannot be treated with surface coatings or other surface treatments to prevent oil damage. Existing non-surface treatment processes are also insufficient to effectively prevent both high-temperature and low-temperature oil damage simultaneously.

[0004] Therefore, the field of cellulose-based food packaging (especially molded fiber food packaging) urgently needs non-surface treatment processes that can improve the oil resistance and environmental safety of food packaging. Summary of the Invention

[0005] The present invention provides a blend comprising at least: an oil repellent, a stabilizer, and cationic starch.

[0006] In one embodiment, the oil repellent comprises a fatty acid salt containing 15-20 carbon atoms (e.g., 15, 16, 17, 18, 19 or 20, preferably 17-19, most preferably 18). Preferably, the fatty acid salt containing 15-20 carbon atoms is a straight-chain fatty acid salt.

[0007] In a preferred embodiment, the oil repellent includes pentadecanoate, hexadecanoate (or palmitic acid, palmitic acid) salt, heptadecanate, octadecanoate (or stearic acid) salt, nonadecanoate or eicosanoate (or arachidic acid) salt, preferably octadecanoate (or stearic acid) salt.

[0008] In one embodiment, the salt includes monovalent and divalent salts, preferably divalent metal (e.g., zinc, magnesium, or calcium) salts.

[0009] In a preferred embodiment, the oil repellent comprises zinc stearate, magnesium stearate, or calcium stearate; more preferably, the oil repellent comprises zinc stearate or magnesium stearate, or a mixture of zinc stearate and magnesium stearate.

[0010] In one embodiment, the stabilizer comprises:

[0011] The polymer contains repeating units derived from styrene and repeating units derived from unsaturated carboxylic acids and / or repeating units derived from unsaturated acid anhydrides.

[0012] In one embodiment, the polymer contains repeating units derived from styrene and repeating units derived from unsaturated carboxylic acids; and / or

[0013] It contains repeating units derived from styrene and repeating units derived from unsaturated acid anhydrides.

[0014] In one embodiment, the blend can be used in wet-end molded fibers. The blend imparts good oil-repellent properties to the resulting molded fiber articles.

[0015] In one embodiment, the polymer contains repeating units derived from styrene and repeating units derived from unsaturated acid anhydrides.

[0016] In one embodiment, the polymer contains repeating units derived from styrene and repeating units derived from unsaturated carboxylic acids.

[0017] In one embodiment, the repeating unit derived from styrene has the following structural formula:

[0018] Among them, R 1 R 2 and R 3 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl.

[0019] * indicates a connection point.

[0020] In one embodiment, the repeating unit derived from unsaturated acid anhydrides has the following structural formula:

[0021] Among them, R4 and R 5 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl.

[0022] * indicates a connection point.

[0023] In one embodiment, the repeating unit derived from unsaturated acid anhydrides has the following structural formula:

[0024] Among them, R 6 and R 7 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl.

[0025] Either M or M' is independently selected from alkali metal ions (e.g., Na+) each time it appears. + K + ), ammonium ions (NH4) + ) or H + ,

[0026] * indicates a connection point.

[0027] In one embodiment, the repeating unit derived from unsaturated carboxylic acids has the following structural formula:

[0028] Among them, R 8 R 9 and R 10Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl.

[0029] "M" is independently selected from alkali metal ions (e.g., Na) in each occurrence. + K + ), ammonium ions (NH4) + ) or H + ,

[0030] * indicates a connection point.

[0031] In a preferred embodiment, the repeating unit derived from unsaturated carboxylic acids has the following structural formula:

[0032] Among them, R 11 Each time it appears, it is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl.

[0033] M”' is independently selected from alkali metal ions (e.g., Na) each time it appears. + K + ), ammonium ions (NH4) + ) or H + ,

[0034] * indicates a connection point.

[0035] In one embodiment, the polymer has a structural formula comprising the following repeating units:

[0036] Among them, R 1 R 2 R 3 R 4 and R 5Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl.

[0037] The molar ratio of a to b is 1:1 to 6:1, preferably 2:1 to 3:1.

[0038] It indicates a direct or indirect connection.

[0039] In one embodiment, the polymer has a structural formula comprising the following repeating units:

[0040] Among them, R 1 R 2 R 3 R 6 and R 7 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl.

[0041] Either M or M' is independently selected from alkali metal ions (e.g., Na+) each time it appears. + K + ), ammonium ions (NH4) + ) or H + ,

[0042] The molar ratio of a to c is 1:1 to 6:1, preferably 2:1 to 3:1.

[0043] It indicates a direct or indirect connection.

[0044] In one embodiment, the polymer has a structural formula comprising the following repeating units:

[0045] Among them, R 1R 2 R 3 R 8 R 9 and R 10 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl.

[0046] "M" is independently selected from alkali metal ions (e.g., Na) in each occurrence. + K + ), ammonium ions (NH4) + ) or H + ,

[0047] The molar ratio of a to d is 1:1 to 6:1, preferably 2:1 to 3:1.

[0048] It indicates a direct or indirect connection.

[0049] In one embodiment, the polymer has a structural formula comprising the following repeating units:

[0050] Among them, R 1 R 2 R 3 and R 11 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl.

[0051] M”' is independently selected from alkali metal ions (e.g., Na) each time it appears. + K + ), ammonium ions (NH4) + ) or H + ,

[0052] The molar ratio of a to d is 1:1 to 6:1, preferably 2:1 to 3:1.

[0053] It indicates a direct or indirect connection.

[0054] In one embodiment, the polymer comprises styrene-maleic anhydride copolymer (SMA).

[0055] In one embodiment, the polymer is starch-modified.

[0056] In one embodiment, the polymer is treated with a hydrophilic modifier. The hydrophilic modifier improves the water solubility of the polymer. For example, hydrophilic groups are introduced by reacting with some or all of the repeating units derived from unsaturated carboxylic acids and / or repeating units derived from unsaturated acid anhydrides in the polymer. In one embodiment, the hydrophilic modifier comprises ammonium hydroxide, sodium hydroxide, and / or potassium hydroxide. Preferably, the hydrophilic modifier comprises ammonium hydroxide. More preferably, the ammonium hydroxide is a 10-30 wt.% (e.g., 10, 15, 20, 25, or 30 wt.%, or a subrange of any value within these ranges) aqueous solution of ammonium hydroxide. Most preferably, the hydrophilic modifier comprises a 25 wt.% aqueous solution of ammonium hydroxide.

[0057] In one embodiment, the polymer is a solution of 5-35 wt.% (e.g., 5.0, 10.0, 15.0, 20.0, 25.0, 30.0 or 35.0 wt.%) of an aqueous solution of a hydrophilic modifier (e.g., ammonium hydroxide, sodium hydroxide and / or potassium hydroxide, preferably ammonium hydroxide).

[0058] In one embodiment, the polymer has a weight-average molecular weight of 1000-100000 Da, for example, 1000, 2000, 3000, 4000, 5000, 10000, 15000, 20000, 25000, 30000, 35000, 40000, 45000, 50000, 55000, 60000, 65000, 70000, 75000, 80000, 85000, 90000, 95000, or 100000 Da, or a subrange consisting of any values ​​within these ranges. Preferably, the polymer has a weight-average molecular weight of 5000-30000 Da.

[0059] In one embodiment, the styrene-maleic anhydride copolymer has a weight-average molecular weight of 1,000-100,000 Da, for example, 1,000, 2,000, 3,000, 4,000, 5,000, 10,000, 15,000, 20,000, 25,000, 30,000, 35,000, 40,000, 45,000, 50,000, 55,000, 60,000, 65,000, 70,000, 75,000, 80,000, 85,000, 90,000, 95,000, or 100,000 Da, or a subrange consisting of any values ​​within these ranges. Preferably, the styrene-maleic anhydride copolymer has a weight-average molecular weight of 5,000-30,000 Da.

[0060] In one embodiment, the molar ratio of repeating units derived from styrene to repeating units derived from unsaturated acid anhydrides in the polymer is from 1:1 to 6:1, for example, 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, 5.5:1, or 6:1, or a subrange consisting of any values ​​within these ranges. Preferably, the molar ratio is from 2:1 to 3:1.

[0061] In one embodiment, the molar ratio of repeating units derived from styrene to repeating units derived from unsaturated carboxylic acids in the polymer is from 1:1 to 6:1, for example, 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, 5.5:1, or 6:1, or a subrange consisting of any values ​​within these ranges. Preferably, the molar ratio is from 2:1 to 3:1.

[0062] In one embodiment, the molar ratio of repeating units derived from styrene to repeating units derived from unsaturated acid anhydrides and repeating units derived from unsaturated carboxylic acids in the polymer is from 1:1 to 6:1, for example, 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, 5.5:1, or 6:1, or a subrange consisting of any values ​​within these ranges. Preferably, the molar ratio is from 2:1 to 3:1.

[0063] In one embodiment, the molar ratio of styrene-derived repeating units to maleic anhydride-derived repeating units in the styrene-maleic anhydride copolymer is from 1:1 to 6:1, for example, 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5.5:1, or 6:1, or a subrange consisting of any values ​​within these ranges. Preferably, the molar ratio of styrene to carboxylic acid and / or anhydride in the styrene-maleic anhydride copolymer is from 2:1 to 3:1.

[0064] In one embodiment, the degree of substitution of the cationic starch can be 0.01-0.5, for example, 0.01, 0.02, 0.03, 0.04, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45 or 0.5, or a subrange consisting of any values ​​in these ranges.

[0065] In one embodiment, the cationic starch comprises cationic amylose and / or cationic amylopectin. Preferably, the cationic starch comprises cationic amylopectin, for example, cationic corn starch.

[0066] In a preferred embodiment, the cationic starch is gelatinized to obtain a cationic starch solution of 1-20 wt.% (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15 or 20 wt.%, or a subrange of any value in these ranges).

[0067] In one embodiment, the blend further comprises a thickener.

[0068] The thickener can be any existing agent that can increase the viscosity of the blend, including low-molecular-weight thickeners and high-molecular-weight thickeners. The low-molecular-weight thickeners include inorganic salts (e.g., sodium chloride, potassium chloride, ammonium chloride, monoethanolamine chloride, diethanolamine chloride, sodium sulfate, sodium phosphate, disodium phosphate, and pentasodium triphosphate, etc.), fatty alcohols or acids (e.g., lauryl alcohol, myristol, decanol, hexanol, octanol, cetyl alcohol, stearyl alcohol, behenol, lauric acid, linoleic acid, linolenic acid, myristic acid, and stearic acid, etc.), alkanolamides (e.g., cocodiethanolamide), ethers (e.g., fatty alcohol polyoxyethylene ether sulfate), esters (e.g., polyethylene glycol distearate), amine oxides, and other thickeners (e.g., betaine). The polymeric thickeners include inorganic materials (e.g., bentonite, attapulgite, and aluminum silicate), cellulose materials (e.g., methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, and hydroxypropylmethylcellulose), polyurethanes, natural gums (e.g., collagen and polysaccharides), polyoxyethylene materials, and other thickeners (e.g., cross-linked polymers of polyethylene methyl ether / methyl acrylate and decanadiene).

[0069] In one embodiment, the blend further comprises a solvent, such as water, such as distilled water, such as double-distilled water.

[0070] In one embodiment, the blend is substantially free of, preferably free of, any fluorinated substances, for example, free of perfluorinated and polyfluoroalkyl substances.

[0071] In one embodiment, the blend may contain or substantially not contain wax-based components, such as natural waxes (e.g., candelilla wax, myricetin, carnauba wax, castor wax, wood wax, carnauba wax, rice bran wax, soybean wax, lignite wax, mineral wax, petroleum wax, white wax, ear wax, lanolin, shellac wax, and cetacean wax) and synthetic waxes (e.g., polyethylene wax, polypropylene wax, polyamide wax, Fischer-Tropsch wax, and oxidized polyethylene wax). Preferably, the blend substantially does not contain wax-based components. More preferably, the blend does not contain wax-based components.

[0072] In one embodiment, the blend comprises 100-300 parts by weight of the oil repellent, for example, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, or 300 parts by weight, or a subrange consisting of any values ​​within these ranges.

[0073] In one embodiment, the blend comprises 5-100 parts by weight of the stabilizer, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 or 100 parts by weight, or a subrange consisting of any values ​​in these ranges.

[0074] In one embodiment, the blend comprises 5-100 parts by weight of the polymer, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100 parts by weight, or a subrange consisting of any values ​​within these ranges. Preferably, the blend comprises 5-15 parts by weight of the polymer, for example, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 parts by weight, or a subrange consisting of any values ​​within these ranges. More preferably, the blend comprises 8-12 parts by weight of the polymer.

[0075] In one embodiment, the blend comprises 5-100 parts by weight of the cationic starch, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100 parts by weight, or a subrange consisting of any values ​​within these ranges. Preferably, the blend comprises 20-60 parts by weight of the cationic starch. More preferably, the blend comprises 30-50 parts by weight of the cationic starch.

[0076] In one embodiment, the blend comprises 1-10 parts by weight of the thickener, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 parts by weight, or a subrange consisting of any values ​​within these ranges. Preferably, the blend comprises 3-8 parts by weight of the thickener. More preferably, the blend comprises 4-7 parts by weight of the thickener.

[0077] In one embodiment, the blend comprises 500-900 parts by weight of the solvent, for example, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 650, 660, 670, 680, 690, 700, 710, 720, 730, 740, 750, 760, 770, 780, 790, 800, 810, 820, 830, 840, 850, 860, 870, 880, 890, or 900 parts by weight, or a subrange consisting of any values ​​within these ranges.

[0078] In one embodiment, the blend comprises the following components:

[0079] 100-300 parts by weight of the aforementioned oil repellent;

[0080] 5-15 parts by weight of the polymer; and

[0081] 20-60 parts by weight of the cationic starch.

[0082] In one embodiment, the blend comprises the following components:

[0083] 100-300 parts by weight of the aforementioned oil repellent;

[0084] 5-15 parts by weight of the polymer;

[0085] 20-60 parts by weight of the cationic starch; and

[0086] Optionally, 1-10 parts by weight of the thickener.

[0087] In one embodiment, the blend comprises the following components:

[0088] 100-300 parts by weight of the aforementioned oil repellent;

[0089] 5-15 parts by weight of the polymer;

[0090] 20-60 parts by weight of the cationic starch;

[0091] Optionally, 1-10 parts by weight of the thickener; and

[0092] Optionally, 500-900 parts by weight of the solvent.

[0093] In one embodiment, the blend comprises 10.0-30.0 wt.% of the oil repellent, for example, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0, 20.0, 21.0, 22.0, 23.0, 24.0, 25.0, 26.0, 27.0, 28.0, 29.0, or 30.0 wt.%, or a subrange consisting of any values ​​within these ranges.

[0094] In one embodiment, the blend comprises 0.5-10.0 wt.% of the stabilizer, for example, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, or 10.0 wt.%, or a subrange consisting of any values ​​within these ranges.

[0095] In one embodiment, the blend comprises 0.5-10.0 wt.% of the polymer, for example, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, or 10.0 wt.%, or a subrange of any value within these ranges. Preferably, the blend comprises 0.5-1.5 wt.% of the polymer, for example, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, or 1.5 wt.%, or a subrange of any value within these ranges. More preferably, the blend comprises 0.8-1.2 wt.% of the polymer.

[0096] In one embodiment, the blend comprises 0.5-10.0 wt.% of the cationic starch, for example, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, or 10.0 wt.%, or a subrange of any value within these ranges. Preferably, the blend comprises 2.0-6.0 wt.% of the cationic starch. More preferably, the blend comprises 3.0-5.0 wt.% of the cationic starch.

[0097] In one embodiment, the blend comprises 0.1-1.0 wt.% of the thickener, for example, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 10 wt.%, or a subrange of any value within these ranges. Preferably, the blend comprises 3-8 wt.% of the thickener. More preferably, the blend comprises 0.4-0.7 wt.% of the thickener.

[0098] In one embodiment, the blend comprises 50.0-90.0 wt.% of the solvent, for example, 50.0, 51.0, 52.0, 53.0, 54.0, 55.0, 56.0, 57.0, 58.0, 59.0, 60.0, 61.0, 62.0, 63.0, 64.0, 65.0, 66.0, 67.0, 68.0, 69.0, 70.0, 71.0, 72.0, 730, 74.0, 75.0, 76.0, 77.0, 78.0, 79.0, 80.0, 81.0, 82.0, 83.0, 84.0, 850, 860, 87.0, 88.0, 89.0, or 90.0 wt.%, or a subrange consisting of any values ​​within these ranges.

[0099] In one embodiment, the blend comprises the following components:

[0100] 10.0-30.0 wt.% of the aforementioned oil repellent;

[0101] 0.5-1.5 wt.% of the polymer; and

[0102] 2.0-6.0 wt.% of the cationic starch.

[0103] In one embodiment, the blend comprises the following components:

[0104] 10.0-30.0 wt.% of the aforementioned oil repellent;

[0105] 0.5-1.5 wt.% of the polymer;

[0106] 2.0-6.0 wt.% of the cationic starch; and

[0107] 0.1-1.0 wt.% of the thickener.

[0108] In one embodiment, the blend comprises the following components:

[0109] 10.0-30.0 wt.% of the aforementioned oil repellent;

[0110] 0.5-1.5 wt.% of the polymer;

[0111] 2.0-6.0 wt.% of the cationic starch;

[0112] 0.1-1.0 wt.% of the thickener; and

[0113] The solvent is 50.0-90.0 wt.%.

[0114] In one embodiment, the weight proportions and weight parts of the aforementioned components in the blend are based on their effective components.

[0115] In one embodiment, the blend can be used in wet-end molded fiber products, such as plates, bowls, etc. of various sizes and shapes. The blend imparts good oil-resistant properties to the resulting molded fiber products.

[0116] In another aspect of the invention, a method for preparing the blends described above is provided, comprising the following steps:

[0117] 1) Mix the stabilizer, cationic starch and solvent described above in this invention;

[0118] 2) Add the oil-repellent agent described above in this invention; and

[0119] 3) Optionally, a thickener described above in this invention may be added.

[0120] In one embodiment, in step 1), the stabilizer comprises the polymer described above in the present invention. In a more specific embodiment, the polymer is dissolved in an aqueous solution of the hydrophilic modifier described above in the present invention to obtain a solution of the polymer described above in the present invention. In a more specific embodiment, the polymer solution is further mixed with water.

[0121] In one embodiment, the mixture of cationic starch and water is heated to 80-100°C, for example, 80, 85, 90, 95 or 100°C, or a subrange consisting of any values ​​within these ranges.

[0122] In one embodiment, in step 1), the stabilizer, cationic starch and solvent are mixed and stirred for, for example, for at least 1, 5, 10 or 15 minutes, preferably at least 10 minutes.

[0123] In one embodiment, after adding the oil-repellent agent in step 2), the mixture is stirred for, for example, at least 30, 60, 90, or 120 minutes, preferably at least 60 minutes. In a further embodiment, the resulting mixture is subjected to high-speed shearing (e.g., at least 5000, 10000, or 15000 rpm) for, for example, at least 1, 5, 10, or 15 minutes, preferably at least 10 minutes.

[0124] In one embodiment, after adding the thickener in step 3), the mixture is stirred for, for example, for at least 1, 5, 10 or 15 minutes, preferably at least 10 minutes.

[0125] In another aspect of the invention, a wet mold mixture comprising the blends described above is provided.

[0126] In one embodiment, the blend constitutes at least 6.0 wt.% of the wet molding compound, for example, at least 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, 14.0, 14.5, or 15.0 wt.%, or a subrange consisting of any values ​​within these ranges. Preferably, the blend constitutes at least 7.0 wt.% of the wet molding compound. More preferably, the blend constitutes at least 8.0 wt.% of the wet molding compound.

[0127] In a further aspect of the invention, a molded (e.g., fibrous) article is provided, which is made from the wet molding mixture of the invention.

[0128] In one embodiment, the product may be, for example, plates, bowls, etc. of various sizes and shapes.

[0129] The blends of this invention do not contain any PFAS components, thus meeting environmental protection requirements and avoiding the potential health risks associated with PFAS. Furthermore, they can be applied to the wet end, a non-surface treatment process, better meeting the oil-proofing requirements of molded fiber food packaging. In particular, articles made from the blends of this invention can effectively prevent oil penetration at both high and low temperatures.

[0130] In this invention, pulp concentration (e.g., paper pulp) refers to the mass percentage of fiber in the pulp, and oven-dry pulp (oven-dry fiber) refers to pulp with a fiber content of 100%. Since the pulp is diluted to different concentrations during actual production, in this invention, the mass percentage of each component in the wet mold mixture refers to the ratio between the mass of each added component and the mass of oven-dry pulp converted from the actual pulp (e.g., paper pulp) used.

[0131] In one embodiment, the weight of oven-dried pulp is obtained by multiplying the weight of the pulp (e.g., paper pulp) by the pulp concentration.

[0132] In this invention, "wet mold mixture" refers to the mixture injected into the mold during the preparation of food packaging using molding fiber technology. This mixture already contains all the necessary components for preparing the food packaging (e.g., fibers, pulp, various additives, etc.), and no further components are added in subsequent processes. In this invention, the mass percentage of each component in the wet mold mixture refers to the ratio between the mass of each added component and the oven-dry pulp mass converted from the actual pulp used. The added blends, etc., are calculated based on their total mass (not their effective components).

[0133] In this invention, "dry matter" refers to the total amount of all substances remaining after the "wet mold mixture" has undergone the final drying process.

[0134] The "room temperature" mentioned in this invention refers to a temperature of 10-35°C.

[0135] In this invention, the wet part may include any process steps of the molded fiber before it is dried.

[0136] The blends described herein may also be referred to as mixtures, blends, or compositions. One or more components (or ingredients) in the blends described herein may be in one or more separate portions, or may be made from one or more separate portions. One or more components in the blends described herein may or may not undergo a chemical reaction.

[0137] The “molding” mentioned in this article, also known as “molding”, refers to the method of processing fibers into shapes using molds.

[0138] The "wet-end molded fiber" mentioned herein refers to a wet pulp with a certain fiber concentration before molding, which may or may not contain other components (such as the blends described herein). The wet pulp can also be called a slurry. The "blends" described in this invention can be directly added to the "wet-end molded fiber".

[0139] The term "fiber" as used herein refers to any fiber known in the art that can be used for molding, such as sugarcane fiber, bamboo fiber, or wood fiber.

[0140] As used herein, “substitution” means that any one or more hydrogen atoms on a specified atom or group are replaced by a portion selected from the indicated group, provided that the replacement does not exceed the normal valence of the specified atom.

[0141] "alkyl" is a branched or straight-chain saturated aliphatic hydrocarbon group. In one embodiment, the alkyl group contains 1 to about 20 carbon atoms, more typically 1 to about 12 carbon atoms, 1 to about 6 carbon atoms, or 1 to about 4 carbon atoms. In one embodiment, the alkyl group contains 1 to about 8 carbon atoms. In some embodiments, the alkyl group is C1-C2, C1-C3, or C1-C6. As used herein, the specified range refers to each member of the range as an alkyl group of a separate kind. For example, as used herein, the term C1-C6... 20 Alkyl refers to a straight-chain or branched alkyl group having 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 carbon atoms, and is intended to refer to each of these as a separate species. For example, as used herein, the term C1-C4 alkyl refers to a straight-chain or branched alkyl group having 1, 2, 3, or 4 carbon atoms, and is intended to refer to each of these as a separate species. When C0-C n When an alkyl group is used herein in conjunction with another group, such as (C3-C7 cycloalkyl)CO-C4 alkyl or -CO-C4 alkyl (C3-C7 cycloalkyl), the indicated group—in this case cycloalkyl—is either directly bonded by a single covalent bond (CO alkyl) or linked by an alkyl chain (in this case 1, 2, 3, or 4 carbon atoms). Alkyl groups may also be linked via other groups such as heteroatoms, as in -O-CO-C4 alkyl (C3-C7 cycloalkyl). Examples of alkyl groups include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane. In one embodiment, the alkyl group is optionally substituted as described above.

[0142] "Alkenyl" is a branched or straight-chain aliphatic hydrocarbon group having one or more carbon-carbon double bonds, which may occur at a stable point along the chain. Non-limiting examples include C2-C8 alkenyl, C2-C6 alkenyl, and C2-C4 alkenyl. As used herein, the specified scope refers to each member of the scope as an alkenyl group of a separate kind, as described above with respect to the alkyl portion. For example, as used herein, the term C1-C... 20 Alkenyl refers to a straight-chain or branched alkenyl group having 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 carbon atoms, and is intended to be described as an independent species. Examples of alkenyl groups include, but are not limited to, vinyl and propenyl groups. In one embodiment, the alkenyl group is optionally substituted as described above.

[0143] "Alynyl" is a branched or straight-chain aliphatic hydrocarbon group having one or more carbon-carbon triple bonds, which can occur at any stable point along the chain, such as C2-C8 ynyl or C2-C6 ynyl. As used herein, the specified range refers to each member of the range as an independent class of ynyl groups, as described above with respect to the alkyl portion. For example, as used herein, the term C1-C... 20 The term alkynyl refers to a straight-chain or branched alkynyl group having 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 carbon atoms, and is intended to be described as an independent species. Examples of alkynyl groups include, but are not limited to, ethynyl, propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, 2-pentynyl, 3-pentynyl, 4-pentynyl, 1-hexynyl, 2-hexynyl, 3-hexynyl, 4-hexynyl, and 5-hexynyl. In one embodiment, the alkynyl group is optionally substituted as described above.

[0144] "Hydrocarbon group" is a branched or straight-chain saturated or unsaturated aliphatic group. The hydrocarbon group can be alkyl, alkenyl, or alkynyl. As used herein, the specified range refers to each member of the range as an independent group. For example, as used herein, the term C1-C... 30 Hydrocarbon groups refer to hydrocarbon groups having 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 carbon atoms, and are intended to be described as independent species.

[0145] "Cycloalkyl" refers to a saturated or unsaturated alkyl group containing an alicyclic structure. For example, as used herein, the terms C3-C6 cycloalkyl or C3-C7 cycloalkyl refer to an alkyl group comprising 1-2 rings, each ring containing 3, 4, 5, or 6, or 3, 4, 5, 6, or 7 carbon atoms, and may contain branches, said rings and / or branches containing carbon-carbon double or triple bonds. Examples of "cycloalkyl" include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, and phenyl. In one embodiment, the alkyl group is optionally substituted as described above.

[0146] Unless otherwise specified, percentages, proportions, ratios, contents or parts mentioned in this invention are by weight.

[0147] The numerical values ​​described in this invention can be approximate values ​​after rounding. Attached Figure Description

[0148] Figure 1 shows the oil resistance test results of Example 1 (numbered 1-1, 1-2 and 1-3 from left to right) for high-temperature oil.

[0149] Figure 2 shows the oil resistance test results for high-temperature oil in Example 2 (numbered 2-1, 2-2 and 2-3 from left to right).

[0150] Figure 3 shows the oil resistance test results for high-temperature oil in Example 3 (numbered 3-1, 3-2 and 3-3 from left to right).

[0151] Figure 4 shows the oil resistance test results for high-temperature oil in Example 4 (numbered 4-1, 4-2 and 4-3 from left to right).

[0152] Figure 5 shows the oil resistance test results of Example 5 (numbered 5-1, 5-2 and 5-3 from left to right) for high-temperature oil.

[0153] Figure 6 shows the oil resistance test results for high-temperature oil in Example 6 (numbered 6-1, 6-2 and 6-3 from left to right).

[0154] Figure 7 shows the oil resistance test results for Comparative Examples 1 and 2 (numbered 7 and 8 from left to right) for high-temperature oil.

[0155] Figure 8 shows the oil resistance test results for low-temperature oil in Example 1 (numbered 1-1, 1-2 and 1-3 from left to right).

[0156] Figure 9 shows the oil resistance test results for low-temperature oil in Example 2 (numbered 2-1, 2-2 and 2-3 from left to right).

[0157] Figure 10 shows the oil resistance test results for low-temperature oil in Example 3 (numbered 3-1, 3-2 and 3-3 from left to right).

[0158] Figure 11 shows the oil resistance test results for low-temperature oil in Example 4 (numbered 4-1, 4-2 and 4-3 from left to right).

[0159] Figure 12 shows the oil resistance test results for low-temperature oil in Example 5 (numbered 5-1, 5-2 and 5-3 from left to right).

[0160] Figure 13 shows the oil resistance test results for low-temperature oil in Example 6 (numbered 6-1, 6-2 and 6-3 from left to right).

[0161] Figure 14 shows the oil resistance test results for Comparative Examples 1 and 2 (numbered 7 and 8 from left to right) for low-temperature oil. Detailed Implementation

[0162] To better understand the present invention, the following embodiments further illustrate the content of the invention, but the content of the invention is not limited to the following embodiments. Unless otherwise specified, the experimental operations described in the following embodiments are routine operations; the reagents and materials described are commercially available unless otherwise specified.

[0163] 1. Preparation of blends

[0164] Example 1

[0165] 1) Dissolve 10g of styrene-maleic anhydride copolymer (weight average molecular weight of 25000 Da, molar ratio of repeating units derived from styrene to repeating units derived from maleic anhydride of 3:1) in 56.67g of 23wt.% ammonium hydroxide aqueous solution to obtain 66.67g of 15wt.% styrene-maleic anhydride copolymer solution; further mix the obtained solution with 228.33g of water and stir for 10 minutes.

[0166] 2) Heat 40g of cationic glutinous corn starch (degree of substitution 0.02-0.3) in 460g of water to 100℃ to obtain an 8wt.% cationic glutinous corn starch solution. Add the obtained starch solution to the solution in step 1) and stir for 10 minutes;

[0167] 3) Add 200g of zinc stearate to the solution in step 2) and stir for 1 hour. Then, shear the solution for 5 minutes at 20,000 rpm using a high-speed shearing machine.

[0168] 4) Finally, add 5g of carboxymethyl cellulose and stir for 10 minutes to obtain the blend.

[0169] Example 2

[0170] 1) Dissolve 12g of styrene-maleic anhydride copolymer (weight average molecular weight of 30000 Da, molar ratio of repeating units derived from styrene to repeating units derived from maleic anhydride of 2:1) in 68.0g of 23wt.% ammonium hydroxide aqueous solution to obtain 80g of 15wt.% styrene-maleic anhydride copolymer solution; further mix the obtained solution with 240g of water and stir for 10 minutes.

[0171] 2) Heat 40g of cationic glutinous corn starch (degree of substitution 0.02-0.3) in 460g of water to 100℃ to obtain an 8wt.% cationic glutinous corn starch solution. Add the obtained starch solution to the solution in step 1) and stir for 10 minutes;

[0172] 3) Add 180g of magnesium stearate to the solution in step 2) and stir for 1 hour. Then, shear the mixture for 5 minutes at 20,000 rpm using a high-speed shear press. Obtain the blend.

[0173] Example 3

[0174] 1) Dissolve 10g of styrene-maleic anhydride copolymer (weight average molecular weight of 30000 Da, molar ratio of repeating units derived from styrene to repeating units derived from maleic anhydride of 2:1) in 56.67g of 23wt.% ammonium hydroxide aqueous solution to obtain 66.67g of 15wt.% styrene-maleic anhydride copolymer solution; further mix the obtained solution with 228.33g of water and stir for 10 minutes.

[0175] 2) Heat 40g of cationic glutinous corn starch (degree of substitution 0.02-0.3) in 460g of water to 100℃ to obtain an 8wt.% cationic glutinous corn starch solution. Add the obtained starch solution to the solution in step 1) and stir for 10 minutes;

[0176] 3) Add 220g of zinc palmitate to the solution in step 2) and stir for 1 hour. Then, shear the solution for 5 minutes at 20,000 rpm using a high-speed shearing machine.

[0177] 4) Finally, add 5g of carboxymethyl cellulose and stir for 10 minutes to obtain the blend.

[0178] Example 4

[0179] 1) Dissolve 12g of styrene-maleic anhydride copolymer (weight average molecular weight of 30000 Da, molar ratio of repeating units derived from styrene to repeating units derived from maleic anhydride of 2:1) in 68.0g of 23wt.% ammonium hydroxide aqueous solution to obtain 80g of 15wt.% styrene-maleic anhydride copolymer solution; further mix the obtained solution with 240g of water and stir for 10 minutes.

[0180] 2) Heat 40g of cationic glutinous corn starch (degree of substitution 0.02-0.3) in 460g of water to 100℃ to obtain an 8wt.% cationic glutinous corn starch solution. Add the obtained starch solution to the solution in step 1) and stir for 10 minutes;

[0181] 3) Add 100g of zinc stearate and 80g of magnesium stearate to the solution in step 2) and stir for 1 hour. Then, shear the mixture for 5 minutes at 20,000 rpm using a high-speed shearing machine to obtain the blend.

[0182] Example 5

[0183] 1) Dissolve 12g of styrene-maleic anhydride copolymer (weight average molecular weight of 30000 Da, molar ratio of repeating units derived from styrene to repeating units derived from maleic anhydride of 2:1) in 68.0g of 23wt.% ammonium hydroxide aqueous solution to obtain 80g of 15wt.% styrene-maleic anhydride copolymer solution; further mix the obtained solution with 235g of water and stir for 10 minutes.

[0184] 2) Heat 40g of cationic glutinous corn starch (degree of substitution 0.02-0.3) in 460g of water to 100℃ to obtain an 8wt.% cationic glutinous corn starch solution. Add the obtained starch solution to the solution in step 1) and stir for 10 minutes;

[0185] 3) Add 50g of zinc palmitate, 50g of zinc stearate, and 80g of magnesium stearate to the solution in step 2) and stir for 1 hour. Then, shear the solution for 5 minutes at 20,000 rpm using a high-speed shearing machine.

[0186] 4) Finally, add 5g of carboxymethyl cellulose and stir for 10 minutes to obtain the blend.

[0187] Example 6

[0188] 1) Mix 30g of 40wt.% ammonium salt aqueous solution of acrylic-styrene copolymer (weight average molecular weight 6000-10000, molar ratio of repeating units derived from styrene to repeating units derived from acrylic acid is 2:1) with 265g of water and stir for 10 minutes.

[0189] 2) Heat 40g of cationic glutinous corn starch (degree of substitution 0.02-0.3) in 460g of water to 100℃ to obtain an 8wt.% cationic glutinous corn starch solution. Add the obtained starch solution to the solution in step 1) and stir for 10 minutes;

[0190] 3) Add 200g of zinc stearate to the solution in step 2) and stir for 1 hour. Then, shear the solution for 5 minutes at 20,000 rpm using a high-speed shearing machine.

[0191] 4) Finally, add 5g of carboxymethyl cellulose and stir for 10 minutes to obtain the blend.

[0192] Comparative Example 1:

[0193] 1) Dissolve 10g of styrene-maleic anhydride copolymer (weight average molecular weight of 30000 Da, molar ratio of repeating units derived from styrene to repeating units derived from maleic anhydride of 2:1) in 56.67g of 23wt.% ammonium hydroxide aqueous solution to obtain 66.67g of 15wt.% styrene-maleic anhydride copolymer solution; further mix the obtained solution with 428.33g of water and stir for 10 minutes.

[0194] 2) Heat 40g of cationic glutinous corn starch (degree of substitution 0.02-0.3) in 460g of water to 100℃ to obtain an 8wt.% cationic glutinous corn starch solution. Add the obtained starch solution to the solution in step 1) and stir for 10 minutes;

[0195] 3) Finally, add 5g of carboxymethyl cellulose and stir for 10 minutes to obtain the blend.

[0196] Comparative Example 2:

[0197] 1) Dissolve 10g of styrene-maleic anhydride copolymer (weight average molecular weight of 30000 Da, molar ratio of repeating units derived from styrene to repeating units derived from maleic anhydride of 2:1) in 56.67g of 23wt.% ammonium hydroxide aqueous solution to obtain 66.67g of 15wt.% styrene-maleic anhydride copolymer solution; further mix the obtained solution with 728.33g of water and stir for 10 minutes.

[0198] 2) Add 200g of zinc stearate to the solution in step 1) and stir for 1 hour. Then, shear the solution for 5 minutes at 20,000 rpm using a high-speed shearing machine.

[0199] 3) Finally, add 5g of carboxymethyl cellulose and stir for 10 minutes to obtain the blend.

[0200] Comparative Example 3

[0201] 200g of zinc stearate and 5g of carboxymethyl cellulose were mixed and stirred in 795g of water, but a stable dispersion could not be obtained, so no further tests were conducted.

[0202] 2. Preparation of molded fiber trays

[0203] Molded trays with a standard weight of 11g (350gsm) were prepared using existing molded fiber technology. The main steps included raw material preparation, pulp preparation, molding, and drying. The raw material used was 367mL of pulp composed of 70% sugarcane fiber pulp and 30% bamboo fiber pulp, with a pulp concentration of 3% (i.e., the mass ratio of substances other than water in the pulp). This is equivalent to 11g of oven-dry pulp. After dilution to 1%, blends from Examples 1-6 and Comparative Examples 1 and 2 were added (each example added in three proportions of 5, 7, and 10 wt.%), along with other additives required by existing molded fiber technology. The pulp concentration was then further diluted to 0.3% by stirring for 2-5 minutes. During the molding stage, the hot-pressing temperature was 200℃, the pressure was 0.4 MPa, and the hot-pressing time was 45s. The specific details of each tray production are shown in Table 1 below.

[0204] Table 1 Summary of Molded Fiber Tray Preparation

[0205] Subsequent oil resistance tests were conducted on each pallet.

[0206] The test examples are for oil resistance tests of low-temperature (4°C) oil and high-temperature (90°C) oil, respectively.

[0207] The trays were tested for resistance to low-temperature and high-temperature oils. The specific procedure was as follows: each tray was placed face up (food side facing up) on a paper towel. Then, equal amounts (approximately 60 mL each) of corn oil at different temperatures were poured onto the face of each tray (covering the entire bottom). After 30 minutes, the outer surface of the tray bottom or the paper towel was observed to see if oil stains remained. The specific results are shown in Tables 2 and 3 and Figure 1-14 below.

[0208] Table 2 shows the oil resistance test results for oil at 90℃.

[0209] *In the table, "No" means that there are no oil stains on the outer surface of the plate bottom and on the paper towel.

[0210] Table 3 shows the oil resistance test results for oil at a low temperature of 4℃.

[0211] *In the table, "No" means that there are no oil stains on the outer surface of the plate bottom and on the paper towel.

[0212] The results of the above test examples show that when 5 wt.% of the blend of the present invention is added, the oil-repellent effect of the tray is poor; when 7 wt.% of the blend of the present invention is added, the oil-repellent effect of the tray is significantly improved; and when 10 wt.% of the blend of the present invention is added, the oil-repellent effect of the tray is optimal, effectively blocking high-temperature oil at 90°C and low-temperature oil at 4°C. Comparative Example 1 shows that without stearate, there is essentially no oil-repellent performance; Comparative Example 2 shows that without starch, the oil-repellent performance of the blend decreases.

Claims

1. A blend, characterized in that, It includes at least: An oil-repellent agent, wherein the oil-repellent agent comprises a fatty acid salt containing 15-20 carbon atoms; preferably, the fatty acid salt containing 15-20 carbon atoms is a straight-chain fatty acid salt; Stabilizer, wherein the stabilizer comprises a polymer containing repeating units derived from styrene and repeating units derived from unsaturated carboxylic acids and / or repeating units derived from unsaturated acid anhydrides; And cationic starch.

2. The blend according to claim 1, wherein the oil repellent comprises pentadecanoate, hexadecanoate, heptadecanoate, octadecanoate, nonadecanoate, or eicosanoate, preferably octadecanoate.

3. The blend according to any one of the preceding claims, wherein the salt comprises a monovalent salt and a divalent salt, preferably a divalent metal (e.g., zinc, magnesium, or calcium) salt.

4. The blend according to claim 1, wherein the oil repellent comprises zinc stearate, magnesium stearate or calcium stearate; more preferably, the oil repellent comprises zinc stearate or magnesium stearate, or a mixture of zinc stearate and magnesium stearate.

5. The blend according to claim 1, wherein the cationic starch comprises cationic amylopectin, for example, cationic corn starch.

6. The blend according to any one of the preceding claims, wherein, The repeating unit derived from styrene has the following structural formula: Among them, R 1 R 2 and R 3 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl. * indicates a connection point; and / or The repeating unit derived from unsaturated acid anhydrides has the following structural formula: Among them, R 4 and R 5 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl. * indicates a connection point; and / or The repeating unit derived from unsaturated acid anhydrides has the following structural formula: Among them, R 6 and R 7 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl. Either M or M' is independently selected from alkali metal ions (e.g., Na+) each time it appears. + K + ), ammonium ions (NH4) + ) or H + , * indicates a connection point; and / or The repeating unit derived from unsaturated carboxylic acids has the following structural formula: Among them, R 8 R 9 and R 10 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl. "M" is independently selected from alkali metal ions (e.g., Na) in each occurrence. + K + ), ammonium ions (NH4) + ) or H + , * indicates a connection point; and / or The repeating unit derived from unsaturated carboxylic acids has the following structural formula: Among them, R 11 Each time it appears, it is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl. M”' is independently selected from alkali metal ions (e.g., Na) each time it appears. + K + ), ammonium ions (NH4) + ) or H + , * indicates a connection point.

7. The blend according to any one of the preceding claims, wherein the polymer has a structural formula comprising the following repeating units: in, R 1 R 2 R 3 R 4 and R 5 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl. The molar ratio of a to b is 1:1 to 6:1, preferably 2:1 to 3:

1. Indicates a direct or indirect connection; or The polymer has a structural formula comprising the following repeating units: Among them, R 1 R 2 R 3 R 6 and R 7 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl. Either M or M' is independently selected from alkali metal ions (e.g., Na+) each time it appears. + K + ), ammonium ions (NH4) + ) or H + , The molar ratio of a to c is 1:1 to 6:1, preferably 2:1 to 3:

1. Indicates a direct or indirect connection; or, The polymer has a structural formula comprising the following repeating units: Among them, R 1 R 2 R 3 R 8 R 9 and R 10 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl. "M" is independently selected from alkali metal ions (e.g., Na) in each occurrence. + K + ), ammonium ions (NH4) + ) or H + , The molar ratio of a to d is 1:1 to 6:1, preferably 2:1 to 3:

1. Indicates a direct or indirect connection; or, The polymer has a structural formula comprising the following repeating units: Among them, R 1 R 2 R 3 and R 11 Each of the following, in each occurrence, is independently selected from H, unsubstituted C1-C6 alkyl, C1-C6 alkyl substituted with one or more substituents, unsubstituted C2-C6 alkenyl, C2-C6 alkenyl substituted with one or more substituents, unsubstituted C2-C6 ynyl, or C2-C6 ynyl substituted with one or more substituents, wherein the substituent is selected from carboxyl, hydroxyl, C3-C6 cycloalkyl, C1-C6 alkoxy, amino, mono- or di-C1-C6 alkylamino, nitro, thiol, C2-C6 alkenyl, or C2-C6 ynyl. M”' is independently selected from alkali metal ions (e.g., Na) each time it appears. + K + ), ammonium ions (NH4) + ) or H + , The molar ratio of a to d is 1:1 to 6:1, preferably 2:1 to 3:

1. Indicates a direct or indirect connection; Preferably, the polymer comprises styrene-maleic anhydride copolymer (SMA).

8. The blend according to any one of the preceding claims, further comprising a thickener.

9. The blend according to any one of the preceding claims, further comprising a solvent, such as water, such as distilled water, such as double-distilled water.

10. The blend according to any one of the preceding claims, wherein the polymer has a weight-average molecular weight of 1,000-100,000 Da; preferably, the polymer has a weight-average molecular weight of 5,000-30,000 Da.

11. The blend according to any one of the preceding claims, wherein the molar ratio of repeating units derived from styrene to repeating units derived from unsaturated acid anhydrides and / or repeating units derived from unsaturated carboxylic acids in the polymer is from 1:1 to 6:1, for example, 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, 5.5:1 or 6:1, or a subrange consisting of any values ​​in these ranges; preferably, the molar ratio is from 2:1 to 3:

1.

12. The blend according to any one of the preceding claims, comprising the following components: 100-300 parts by weight of the aforementioned oil repellent; 5-15 parts by weight of the polymer, wherein the polymer contains repeating units derived from styrene and repeating units derived from unsaturated carboxylic acids and / or repeating units derived from unsaturated acid anhydrides; 20-60 parts by weight of the cationic starch; Optional 1-10 parts by weight of the thickener; and Optional 500-900 parts by weight of the solvent.

13. A wet mold compound comprising the blend according to any one of claims 1-12.

14. The wet molding compound according to claim 13, wherein the blend constitutes at least 6.0 wt.% of the wet molding compound by mass; preferably, the blend constitutes at least 7.0 wt.% of the wet molding compound by mass; more preferably, the blend constitutes at least 8.0 wt.% of the wet molding compound by mass.

15. A molded fiber article, which is made from the wet molding mixture of claim 13 or 14.

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