WO2022006669A1 - Additifs pour favoriser l'imperméabilité dans des produits fibreux - Google Patents

Additifs pour favoriser l'imperméabilité dans des produits fibreux Download PDF

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Publication number
WO2022006669A1
WO2022006669A1 PCT/CA2021/050927 CA2021050927W WO2022006669A1 WO 2022006669 A1 WO2022006669 A1 WO 2022006669A1 CA 2021050927 W CA2021050927 W CA 2021050927W WO 2022006669 A1 WO2022006669 A1 WO 2022006669A1
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Prior art keywords
starch
waxy
modified
group
cationic
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PCT/CA2021/050927
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English (en)
Inventor
Yongfeng AI
Dongxing LI
Gexiao SUN
Dale Gary Kavalew
Lester P. Schaevitz
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University Of Saskatchewan
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Publication of WO2022006669A1 publication Critical patent/WO2022006669A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D21H17/29—Starch cationic
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents

Definitions

  • the present application relates to additives for fiber products, as well as processes for their preparation, methods and uses thereof.
  • Molded fiber also known as molded pulp
  • PFASs Per- and polyfluoroalkyl substances
  • Dispersion-coated paper products can be repulped, composted, or burned in a waste burning plant, which means that dispersion coatings have certain environmental benefits over plastic coatings.
  • aqueous coating dispersions were mainly based on petroleum-based synthetic polymers, such as hydrocarbons and polyolefins. Recent attempts to replace synthetic polymers with bio-based alternatives, such as modified starches, have been reported. Bio-based coatings, however, are sensitive to water and typically more brittle than petroleum- based coatings.
  • Starch is commonly used in the paper industry for surface sizing for improving paper properties. Typical starch sizing is targeted to have a starch pickup of 45 kg per 1000 kg of product, or about 4.5%.
  • the starches are typically in-mill converted products, e.g. ammonium persulfate converted starch, pre-converted starch like oxidized starches, starch ethers and esters, and cationic starches. Oxidized starches can easily re-enter the paper making system as anionic trash through the broke recycling process and may result in severe contamination of water and effluent during the process.
  • One of the drawbacks of bio-based polymer dispersions is their high viscosity, which makes the use of high dry solids content difficult, resulting in a longer and more energy-consuming drying step of the coating process.
  • additives, blends and compositions of the application containing modified starch provide high water and oil resistance to fiber products made thereof.
  • Comparable additives, blends and compositions comprising native starch did not display the same properties, highlighting the surprising results obtained with the additives, blends and compositions of the application.
  • the present application includes an additive for fiber products, comprising at least one modified starch.
  • the present application further includes a blend of additives for fiber products, the blend comprising at least one modified starch, in combination with at least one sizing agent and/or at least one cationic polymer.
  • the additive or the blend of additives is a pulp slurry additive. In some embodiments, the additive or the blend of additives is a pulp slurry additive for use in the manufacture of fiber products.
  • said at least one modified starch is made from a starch having high average particular size and low amylose content.
  • said starch is selected from the group consisting of waxy corn starch, waxy potato starch, waxy sweet potato starch, waxy tapioca starch, waxy rice starch, waxy sago starch, waxy sorghum starch, waxy wheat starch, waxy oat starch, and waxy barley starch.
  • said at least one modified starch is modified by esterification. In some embodiments, said at least one modified starch is modified by esterification with an alkyl anhydride, an alkyl succinic anhydride, an alkenyl succinic anhydride, or mixtures thereof. In some embodiments, said alkyl or alkenyl group comprises 4 to 24 carbon atoms. In some embodiments, said at least one modified starch is modified with octenyl succinic anhydride or acetic anhydride.
  • said at least one modified starch is modified by cationic modification.
  • said starch is modified by reaction with a reagent comprising cationic groups.
  • the fiber products are molded-fiber products.
  • said sizing agent is alkyl ketene dimer.
  • a ratio (w/w) of said sizing agent to said at least one modified starch is about 1 : 1 to about 1 :5.
  • said cationic polymer is in an amount of from about 0.03-0.16 g per gram of the composition.
  • the present application further includes use of an additive or a blend of additives in the manufacture of fiber products.
  • the present application further includes a composition for fiber products, the composition comprising fiber materials; water; and at least one modified starch.
  • the present application further includes a composition for fiber products, the composition comprising fiber materials; water; and a blend of additives comprising at least one modified starch, in combination with at least one sizing agent and/or at least one cationic polymer.
  • the fiber material is selected from wood fiber including hardwood and softwood fibers, bamboo, seagrass, bagasse, sugarcane, oil palm fiber, coconut coir, wheat straw, rice straw, flax, kenaf, hemp, miscanthus grass and/or rice husk.
  • the present application further includes use of a composition of the present application in the manufacture of fiber products.
  • the fiber products are molded fiber products.
  • the present application further includes a process for making a blend of additives for fiber products, the process comprising blending said at least one modified starch, in combination with said at least one sizing agent and/or said at least one cationic polymer.
  • the present application further includes a process for manufacturing a molded fiber product, the process comprising mixing fiber materials, at least one modified starch, and water to obtain a pulp; molding the pulp and heating to obtain the molded fiber product.
  • the present application further includes a process for manufacturing a molded fiber product, the process comprising mixing fiber materials, at least one modified starch, in combination with at least one sizing agent and/or at least one cationic polymer, and water to obtain a pulp; molding the pulp and heating to obtain the molded fiber product.
  • heating the pulp is at a temperature between 130 and 160 °C.
  • the present application further includes a molded fiber product manufactured by a process of the present application.
  • the molded fiber product is a food container. In some embodiments, the molded fiber product is a single use container.
  • the present application further includes a method for promoting oil- and/or water-impermeability in fiber products, the method comprising treating a fiber material with an additive or a blend of additives of the present application, and forming the fiber products.
  • the present application further includes use of an additive or a blend of additives of the present application for promoting oil- and/or water-impermeability in fiber products.
  • the present application further includes a fiber product treated with an additive or a blend of additives of the present application.
  • the fiber product is a molded fiber product.
  • the fiber product is a food container.
  • the fiber product is a single use container.
  • blend(s) of the application or “blend(s) of the present application” and the like as used herein refers to a mixture of additives to be included in compositions for fiber products.
  • composition(s) of the application refers to a composition, such a fiber pulp, comprising fiber materials and a blend of additives of the application.
  • the second component as used herein is chemically different from the other components or first component.
  • a “third” component is different from the other, first, and second components, and further enumerated or “additional” components are similarly different.
  • suitable means that the selection of the particular composition or conditions would depend on the specific steps to be performed, the identity of the components to be transformed and/or the specific use for the compositions, but the selection would be well within the skill of a person trained in the art.
  • alkyl as used herein, whether it is used alone or as part of another group, means straight or branched chain, saturated alkyl groups. The number of carbon atoms that are possible in the referenced alkyl group are indicated by the prefix “Cni-n2”.
  • Ci-ioalkyl means an alkyl group having 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 carbon atoms.
  • octenyl refers to an alkyl group having 8 carbon atoms in a straight conformation.
  • alkylene whether it is used alone or as part of another group, means straight or branched chain, saturated alkylene group, that is, a saturated carbon chain that contains substituents on two of its ends. The number of carbon atoms that are possible in the referenced alkylene group are indicated by the prefix “Cn-iV.
  • Ci-6alkylene means an alkylene group having 1 , 2, 3, 4, 5 or 6 carbon atoms.
  • anhydride refers to a group comprising two acyl groups in which the two acyl groups are bonded to the same oxygen atom, o o
  • succinic refers to a group derived from succinic acid which has the molecular formula o , i.e. a succinic group has the formula 0 , wherein
  • R and R’ may be any groups, same or different, or may be linked together.
  • starch refers to natural carbohydrates, typically branched amylopectin and essentially linear amylose, extracted from various plants, such as rice, maize, pea, potato, quinoa, tapioca, wheat, etc. Depending on the plant, the content of amylose and amylopectin in the starch will differ, generally between 20 to 25% of amylose and 75 to 80% of amylopectin by weight.
  • modified starch as used herein means a starch that has been chemically modified, usually to impart different properties to the starch under specific conditions.
  • cationic modification means a modification to a starch that comprises chemical modification by reaction with a reagent comprising cationic groups to covalently bind the cationic groups to the starch.
  • waxy starch refers to a starch which naturally contains little amylose.
  • sizing agent refers to additives used in the papermaking industry for improving hydrophobicity, retention and distribution in acid, neutral or alkaline sizing environments.
  • pulp slurry refers to a mixture of solids, in particular lignocellulosic or natural fibrous material, suspended in liquid, typically water.
  • additives, blends and compositions of the application containing modified starch provide high water and oil resistance to fiber products made thereof. Comparable additives, blends and compositions comprising native starch and other modified forms of starch did not display the same properties, highlighting the surprising results obtained with the additives, blends and compositions of the application.
  • the present application includes an additive for fiber products, comprising at least one modified starch.
  • the additive is a pulp slurry additive.
  • the pulp slurry additive of the present application may cause fiber products comprising the same to be resistant to permeation to oil, grease and water.
  • the present application also includes a blend of additives for fiber products, the blend comprising at least one modified starch, in combination with at least one sizing agent, and/or at least one cationic polymer.
  • the blend of additives is a pulp slurry blend of additives.
  • Starch is an affordable, bio-renewable and biodegradable material, which naturally possesses grease-repelling properties.
  • the starch has a large average particle size ( ⁇ 60 pm) and is substantially free of amylose.
  • high average particular size is at least 50pm, at least 40pm, or at least 30pm.
  • the average particular size is between 30 pm and 50 pm.
  • the starch is a waxy starch, i.e. substantially free of amylose.
  • the starch is selected from the group consisting of waxy corn starch, waxy potato starch, waxy sweet potato starch, waxy tapioca starch, waxy rice starch, waxy sago starch, waxy sorghum starch, waxy wheat starch, waxy oat starch, and waxy barley starch, and mixtures thereof.
  • the at least one modified starch comprises modifications to the starch made to impart different properties, for example to enhance the hydrophobicity of the starch.
  • esterification is used to enhance the hydrophobicity of the starch.
  • the starch is esterified by reaction with an alkyl anhydride, an alkyl succinic anhydride or an alkenyl succinic anhydride.
  • the alkyl or alkenyl group in the succinic anhydride comprises 4 to 24 carbon atoms, 5 to 15 carbon atoms, 6 to 10 carbon atoms or 8 carbon atoms.
  • the starch is esterified with octenyl succinic anhydride and/or acetic anhydride, which are accepted modifications for the preparation of starch for food uses.
  • the at least one modified starch is modified by reacting the corresponding native starch with the appropriate anhydride in aqueous suspension using various amounts (wt%) of the anhydride.
  • the native starch is modified with about 2% (w/w) to about 15% (w/w), about 3% (w/w) to about 10% (w/w) or about 6% (w/w) to about 9% (w/w) of the anhydride.
  • the at least one modified starch is modified by and/or is further modified by cationic modification of the corresponding native starch.
  • the cationic modification is the addition of at least one group comprising a cationic amine.
  • the group comprising a cationic amine has the following structure: wherein L is a linker group, R 1 , R 2 and R 3 are independently selected from H and
  • Ci-6alkyl X is a suitable counterion and represents a point of attachment to the starch.
  • the linker is selected from Ci-6alkylene and Ci- 6alkenylene, optionally interrupted by an ester or ether linkage, and optionally substituted with OH or halogen.
  • the suitable counterion is Cl , Br, h, F , or any other suitable counterion known in the art.
  • said cationic modification comprises reacting the starch with a reagent comprising at least one cationic group or a group that is converted to at least one cationic group.
  • the reagent is a compound comprising at least one quaternary amine or a group that is converted to at least one quaternary amine after reacting with the starch, such as an OH group to form a covalent bond.
  • a group that is converted to at least one quaternary amine is converted by reaction of a tertiary amine with an acid, such as HCI, HBr, HI, HF, or an alkylation reagent, such as a halo-compound, and thus is well within the purview of a skilled person in the art.
  • the reagent comprising at least one cationic group is 2,3- epoxypropyltrimethylammonium chloride, (4-chloro-2-butenyl) trimethylammonium chloride; dimethylaminoethyl methacrylate, or b-dimethylaminoethyl chloride hydrochloride.
  • the at least one modified starch is modified to comprise from about 0.2% to about 0.8% (w/w) of the at least one group comprising a cationic amine.
  • Selection of a suitable reagent comprising cationic groups and methods for reacting the same are well within the purview of a person of skill in the art.
  • said at least one modified starch comprises: a) cationic modification of the native starch; b) modification by reaction with an alkyl anhydride, an alkyl succinic anhydride or an alkenyl succinic anhydride; or c) both modifications.
  • a native starch may be first modified by reaction with an alkyl anhydride, an alkyl succinic anhydride or an alkenyl succinic anhydride, followed by cationic modification.
  • the blend of additives of the present application also comprises a sizing agent.
  • Sizing agents are substances typically applied to, or incorporated into, fiber materials to act as a protective filler or glaze. Sizing agents are used in papermaking and textile manufacturing to change the absorption and wear characteristics of those materials. Sizing agents may influence dewatering and retention of fillers and fibers in fiber products.
  • the sizing agent is an alkyl ketene dimer.
  • the ratio (w/w) of the sizing agent to the modified starch in the additive is about 1 :1 to about 1 :5, or about 1 :1.5 to about 1 :2.
  • the blend of additives of the present application further comprises at least one cationic polymer.
  • the at least one cationic polymer is present in an amount of 1-5 gram per 32 gram of the mixture of the starch, fiber material, sizing agent and water, i.e. 0.03-0.16 g per gram of the mixture.
  • the at least one cationic polymer is a cationic polyvinylamine, cationic polyacrylamide, or a derivative and/or copolymer thereof.
  • the at least one cationic polymer is a cationic polyvinylamine copolymer.
  • the at least one cationic polymer is Solenis HercobondTM 6950, or at least one cationic polymer with similar characteristics to Solenis HercobondTM 6950 cationic polymer.
  • Solenis HercobondTM 6950 or at least one cationic polymer with similar characteristics to Solenis HercobondTM 6950 cationic polymer.
  • Other known cationic polymers may be used and this is well within the purview of a skilled person in the art.
  • the blend of additives does not comprise a cationic polymer when the at least one modified starch is modified by and/or is further modified by cationic modification, as described above.
  • the cationic modification of the starch obviates the need for a separate cationic polymer.
  • the charge bonding functionality of the separate cationic polymer additive is replaced by the cationic modification of the starch, by allowing charge bonding between the cationic starch and the naturally anionic fiber.
  • such modification of the native starch or further modification of the modified starch may enhance the water and oil resistance of the fiber products made therefrom.
  • the at least one modified starch, at least one sizing agent and/or at least one cationic polymer are blended at various ratios to prepare additives for molded fiber products, with the primary goal of replacing PFASs in the manufacturing of molded fiber products.
  • the blend of additives is a pulp slurry blend of additives.
  • the present application further includes a composition comprising fiber materials; water; and at least one modified starch.
  • the present application further includes a composition comprising fiber materials; water; and a blend of additives comprising at least one modified starch, in combination with at least one sizing agent, and/or at least one cationic polymer.
  • the present application further includes a composition comprising fiber materials; water; and a blend of additives comprising at least one modified starch, in combination with at least one sizing agent, and at least one cationic polymer.
  • the modified starch is in an amount of 7.5% to 47.5% (w/w) based on the total solids in the pulp slurry, i.e. the modified starch and the fiber materials.
  • the modified starch is in an amount of 12.5% to 42.5% (w/w) based on the total solids in the pulp slurry. In some embodiments, the modified starch is in an amount of 17.5% to 37.5% (w/w) based on the total solids in the pulp slurry. For example, when the total weight of the fiber materials and modified starch is 100kg in a slurry and the amount of modified starch is 25kg, that would translate to a 25% (w/w) modified starch content.
  • the blend of additives is as described above.
  • the fiber materials are natural fibers.
  • the fiber materials are wood fibers including hardwood and softwood fibers, plant cellulose fiber, recycled fibers, and/or any biomass.
  • the plant cellulose fiber is bamboo, seagrass, bagasse, sugarcane, oil palm fiber, coconut coir, wheat straw, rice straw, flax, kenaf, hemp, miscanthus grass and/or rice husk.
  • the recycled fiber is bleached chemical thermo mechanical pulp (BCTMP) or recycled bleached kraft pulp (RBK).
  • the fiber product is a molded fiber product.
  • a ratio (w/w) of the sizing agent to the total weight of the at least one modified starch and fiber is from 1 :1 to 1 :5.
  • the weight of sizing agent is equivalent to the total weight of the at least one modified starch and fiber material.
  • a sufficient amount of water is added to mix the materials into a dough, and 1-5 g of cationic polymer used per 32 g of the mixture of the at least one modified starch, fiber, sizing agent and water.
  • the present application includes a process for manufacturing a molded fiber product, the process comprising mixing fiber materials, at least one modified starch, and water to obtain a pulp; and molding the pulp and heating to obtain the molded fiber product.
  • the present application includes a process for manufacturing a molded fiber product, the process comprising mixing fiber materials, at least one modified starch, at least one sizing agent, and optionally at least one cationic polymer and water to obtain a pulp; and molding the pulp and heating to obtain the molded fiber product.
  • the fiber materials, at least one modified starch, at least one sizing agent, and optionally at least one cationic polymer are as previously described herein.
  • Mixing the components may be done according to any known techniques.
  • the molding may also be carried out according to a technique known in the art, and molds may be selected according to the intended types of molded fiber products.
  • heating is carried out at a temperature sufficient for proper molding of the compositions into the molded fiber products. A skilled person in the art will appreciate that the heating and other conditions will be dependent on the process and equipment used. Selection of suitable conditions for manufacturing a molded fiber product would be well within the purview of the skilled artisan.
  • the present application further provides molded fiber products obtained from the process of manufacturing described herein.
  • the molded fiber products are single use containers.
  • the molded fiber products are cups, plates, bowls, trays, bottles, fast- food packaging, or any other type of food and/or beverage container.
  • molded fiber products directed for the food industry, one will appreciate that any molded fiber product requiring water and oil resistance may be obtained from the process of the present application. Such molded fiber products are thus within the scope of the present application.
  • the present application further provides a method for promoting oil- and/or water-impermeability in fiber products, the method comprising treating a fiber material with an additive or a blend of additives of the present application, and forming the fiber products.
  • the present application further provides the use of an additive or a blend of additives of the present application for promoting oil- and/or water- impermeability in fiber products.
  • water impermeability is resistance to hot water, for example at a temperature between 70-100 °C.
  • oil impermeability is resistance to hot oil, for example at a temperature of 80-120 °C.
  • the present application further provides a fiber product treated with an additive or a blend of additives of the present application.
  • the fiber product is a molded fiber product; paper such as printing paper, packaging paper, or paper bag; cardboard, or any other type of fiber product know in the art that may require oil- and/or water-permeability.
  • Additives, blends and compositions of the present application can be prepared by various processes. The choice of particular components may influence the selection of one process over another. The selection of a particular process to prepare a given blend or composition of the present application is within the purview of the person of skill in the art. Some starting materials for preparing blends and compositions of the present application are available from commercial chemical sources. Other starting materials are readily prepared from available precursors using straightforward transformations that are well known in the art.
  • the present application includes a process for making a blend of additives for fiber products comprising blending said at least one modified starch, and said at least one sizing agent, and/or said at least one cationic polymer.
  • the components of the blends are as previously described herein.
  • Starch sources used for the tests include potato, waxy potato, quinoa, pea, waxy maize, maize, high-amylose maize, tapioca, wheat, waxy rice and rice. Some characteristics of these starches are presented in Table 1 . Table 1. Average granular sizes and amylose contents of tested starches
  • Modified starches were prepared in a granular form by reacting the aforementioned native starches in aqueous suspension with acetic anhydride (12% of starch weight) or octenyl succinic anhydride (3%, 6%, 9% and 15% of starch weight), respectively.
  • Starch, fiber and water were mixed at different proportions to form a pulp.
  • AKD was included in the starch-fiber mixture, and the weight of AKD was equivalent to the total weight of starch and fiber.
  • a sufficient amount of water was added to mix those materials into a pulp.
  • HercobondTM 6950 were added per 32 g of the mixture of starch and fiber when indicated. The pulp was applied to the mold, followed by compressing the mold with clamp and placing it in an oven at 140°C for 90 min.
  • Table 2 shows results of water and oil resistance tests for various modified starches and ratios.
  • Waxy potato 1 1 No Yes
  • the bowls made with the above native starches showed little water resistance. Some of them possessed good grease resistance, especially those with potato and waxy potato starches, which were able to hold hot oil without obvious leaking for at least 1 hour. Waxy potato and potato starches were subsequently modified with octenyl succinic anhydride (3%, basis on dry weight of starch). The bowl made with the modified waxy potato displayed better hot water resistance (Table 2).
  • Waxy potato starch was further modified with different concentrations of octenyl succinic anhydride (OSA) and acetic anhydride (AA), respectively.
  • OSA octenyl succinic anhydride
  • AA acetic anhydride
  • Table 2 The results clearly confirm the improved properties of the blends of additives and compositions of the present application in providing water and oil resistance to molded fiber products. Similar tests were conducted on other modified starches which also showed good water and oil resistance.
  • Starch sources used for the tests include potato, waxy potato, quinoa, pea, waxy maize, maize, high-amylose maize, tapioca, wheat, waxy rice and rice. Some characteristics of these starches are presented in Table 1 .
  • OS starches were prepared in a granular form by reacting the above- mentioned native starches in an aqueous suspension with octenyl succinic anhydride (OSA, 3%, 6%, and 9% of starch weight), respectively.
  • the starch sample was suspended in distilled under vigorous stirring.
  • Sodium hydroxide solution (3%) was added dropwise to the starch suspension to increase the pH to 8.0, and the temperature was kept at 35 °C.
  • the predetermined amount of OSA was weighed and added dropwise into the starch suspension. The pH was maintained at 8.0 ⁇ 0.5 and the temperature at 35 °C when adding all the OSA to the starch suspension.
  • the completion of the reaction was signaled by the stabilization of pH value at 8.0 for at least 30 s.
  • HCI 1.0 M
  • the modified starch was gathered through centrifugation at 5000 g for 15 min, and the OS-starch was washed with distilled water twice, followed by washing with absolute ethanol twice. The collected OS-starch was dried in an oven at 40 °C overnight. The dried starch was then ground to fine a powder.
  • a pulp was prepared by mixing 5 g dry straw fiber (selected from wheat straw, miscanthus grass, bagasse, bamboo, BCTMP, RBK - recycled bleached kraft, and new corrugated container trimmings - primarily unbleached softwood pulp), 2 g OS starch, 1 g cationic polymer (HercoBondTM), and 3.5 g alkyl ketene dimer (AKD) in 320 ml_ water.
  • the pulp was applied to the thermal forming mold, followed by compressing the mold with clamp and placing it in an oven at 140 °C for 90 min. The ratio between different components may vary.
  • test bowls were molded from each formulation of starch type and percentage of OSA modification.
  • the finished bowls were filled with vegetable oil of 90 °C and then observed for oil impermeability over time.
  • Results of the performance test are shown below in Table 3 as a function of time: " ⁇ 2" means that oil flow-through was observed at ⁇ 2 h after pouring of oil into the molded fiber bowl; and "xx+” means that no oil flow-through was observed for more than xx h after the introduction of hot oil.
  • Starch can be made cationic by treating with, for example, an etherifying reagent that contains cationic groups.
  • Some typical cationic modification reagents are listed in Table 5. Suitable reaction conditions include those known in the art for making cationic starch. When the reaction is complete, the starch is isolated from the reaction medium.
  • Tested pulp fiber types included:
  • Bagasse OSA and CAT Sufficient Sufficient a AII tests were performed with a single base starch at constant OSA and CAT modification levels. Water was introduced at 100 °C and fiber remained attached to the solid matrix for at least 1 h as “sufficient”. b AII tests were performed with a single base starch at constant OSA and CAT modification levels. Oil was introduced at 90 °C and no oil flow-through was observed to 30 min as “sufficient”.

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Abstract

La présente invention concerne des additifs pour des produits fibreux destinés à favoriser l'imperméabilité à l'huile et à l'eau. L'invention concerne également des additifs ou un mélange d'additifs pour des produits fibreux. L'additif comprend au moins un amidon modifié ou le mélange comprend au moins un amidon modifié, en combinaison avec au moins un agent d'encollage et/ou au moins un polymère cationique. L'invention concerne également une composition pour des produits fibreux comprenant des matériaux fibreux ; de l'eau ; et le mélange d'additifs, des utilisations et des procédés associés. Les additifs biodégradables et compostables de la présente demande peuvent être utilisés en tant que substituts de substances per- et polyfluoroalkyliques (PFAS) pour conférer une imperméabilité aux graisses et à l'eau dans des produits fibreux.
PCT/CA2021/050927 2020-07-07 2021-07-07 Additifs pour favoriser l'imperméabilité dans des produits fibreux WO2022006669A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2351241A1 (fr) * 2000-06-20 2001-12-20 Cerestar Holding B.V. Compositions d'amidon et leur utilisation pour la partie humide de la preparation du papier
CA2423386A1 (fr) * 2000-08-10 2002-02-21 Cargill, Incorporated Utilisation de compositions a base d'amidon dans la fabrication du papier
EP1733093A1 (fr) * 2004-03-31 2006-12-20 Dresden Papier GmbH Papiers ayant une resistance elevee a la penetration de graisses et d'huiles, et procede pour les produire
WO2019131048A1 (fr) * 2017-12-28 2019-07-04 ダイキン工業株式会社 Produit moulé en pâte et son procédé de fabrication
CN109972443A (zh) * 2019-03-14 2019-07-05 华南理工大学 一种防霉抗水育苗纸浆模塑制品及其制备方法与应用

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2351241A1 (fr) * 2000-06-20 2001-12-20 Cerestar Holding B.V. Compositions d'amidon et leur utilisation pour la partie humide de la preparation du papier
CA2423386A1 (fr) * 2000-08-10 2002-02-21 Cargill, Incorporated Utilisation de compositions a base d'amidon dans la fabrication du papier
EP1733093A1 (fr) * 2004-03-31 2006-12-20 Dresden Papier GmbH Papiers ayant une resistance elevee a la penetration de graisses et d'huiles, et procede pour les produire
WO2019131048A1 (fr) * 2017-12-28 2019-07-04 ダイキン工業株式会社 Produit moulé en pâte et son procédé de fabrication
CN109972443A (zh) * 2019-03-14 2019-07-05 华南理工大学 一种防霉抗水育苗纸浆模塑制品及其制备方法与应用

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