EP3735490A1 - Nouveau matériau à base de fibres végétales résistant à l'humidité et son procédé de préparation - Google Patents
Nouveau matériau à base de fibres végétales résistant à l'humidité et son procédé de préparationInfo
- Publication number
- EP3735490A1 EP3735490A1 EP18842822.1A EP18842822A EP3735490A1 EP 3735490 A1 EP3735490 A1 EP 3735490A1 EP 18842822 A EP18842822 A EP 18842822A EP 3735490 A1 EP3735490 A1 EP 3735490A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- silicate compound
- porous fiber
- fiber material
- layer
- multivalent cation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- 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
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
-
- 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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/13—Silicon-containing compounds
-
- 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
- D21H17/63—Inorganic compounds
-
- 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
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- 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
- D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
- D21H17/73—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of inorganic material
Definitions
- the present invention relates to a novel material based on moisture-resistant vegetable fibers, as well as to a process for its preparation.
- Vegetable fiber materials are important materials in our society, primarily with paper and cardboard. The production of these two only materials amounts to about 100 million tons per year. These materials are useful in a number of areas such as thermal insulation, writing, packaging and transportation of goods or hygiene. Many of these applications expose these materials to moisture. But their resistance to these conditions is often mediocre, up to the dislocation of the material.
- Treatments consisting of coating by impermeable layers on the surface of the material which slow down the penetration of water into the core of the material (polymers or waxes type).
- Starch treatments that consist in filling the porosity of the material giving it a better compressive strength.
- Layers of a hydrophobic material can be applied to the surfaces of the material thus slowing the penetration of water into the core thereof. but these surface treatments, often made with polymers or waxes, are:
- the compound used for the treatment reinforces the junctions between fibers or doubles the cellulosic network to prevent their disintegration and the loss of coherence of the material. These treatments are also often toxic and / or polluting and limit the possibility of recycling the material.
- Soluble silicate compounds especially sodium silicate compounds, are already used in the paper industry. They have been progressively used for fiber reinforcement to replace starch because of their easier and more uniform application. The mechanical strength of the materials thus obtained is improved in wet conditions. But, as in the case of starch, in the case of highly humid conditions (close to 100% humidity) or in the presence of liquid water, the ionic character of the silicate compounds used causes their solubilization, which gives back to the paper its initial characteristics of low resistance in a humid environment.
- One of the aspects of the invention is to provide a new plant fiber material which is more resistant in wet environments than existing materials currently treated with a soluble silicate compound.
- Another aspect of the invention is to provide a process for preparing the vegetable fiber material to improve its wet strength.
- Another aspect of the invention is to provide a process for preparing the plant fiber material insolubilizing the soluble silicate compound previously used in industry, and to reduce the negative impact of water on the material.
- Another aspect of the invention is to provide an inexpensive method of preparation for introducing negatively charged compounds while permitting insolubilization of the multivalent cations.
- Another aspect of the invention is to provide moisture resistant packaging or transport materials.
- the present invention relates to a porous fiber material containing or consisting of:
- the said at least one layer of silicate compound being in association with at least one multivalent cation, this combination reinforcing the fiber system by forming an interconnected network
- Said at least one multivalent cation in combination with the silicate compound, compensates for at least 10% of the negative charge carried by the silicate compound.
- silicate compound means the combination of compounds of average formula (Si0 2 ) x A 2 / n 0, A representing one or more cations of average charge n +, n being comprised of 1 at 3 and especially 1, 2 or 3, and x being a number from 0.5 to 10,000; this definition includes silicates and colloidal silicas.
- the term "in combination" means that two chemical species are at least partly linked by Coulombic, ionic or ionocovalent interactions.
- multivalent cation means:
- silicate compound in combination with at least one multivalent cation a silicate compound whose silicate part (species of average formula (Si0 2 ) x 0 2 in the formula above) is in combination with at least one multivalent cation.
- this implies that at least some of the species A in the formula above are multivalent cations.
- porous fiber materials according to the present invention mainly comprise plant fibers in which or between which are impregnated:
- the present invention relates to a porous fiber material containing or consisting of:
- the aforesaid at least one layer of silicate compound being in association with at least one multivalent cation in a proportion of 5 to 49% of the total weight of the material, this association reinforcing the fiber system by forming an interconnected network,
- Said at least one multivalent cation in combination with the silicate compound, compensates for at least 10% of the negative charge carried by the silicate compound.
- the present invention also relates to a porous fiber material, containing or consisting of:
- the said at least one layer of silicate compound being in association with at least one multivalent cation at 5 to 49% of the total weight of the material, this combination reinforcing the fiber system forming an interconnected network,
- Said at least one multivalent cation in combination with the silicate compound, compensates for at least 10% of the negative charge carried by the silicate compound, said material having tensile strength values under strictly higher humid conditions:
- a determination of the constitution of the material according to the invention can be done for example by SEM combined with energy dispersive analysis or by elemental analysis by inductively coupled plasma spectroscopy coupled with the use of organic elemental analyzers.
- the term "material comparable to a material of the invention” means a material whose only difference with a material of the invention is
- dry conditions means conditions in which the relative humidity may range from 80 to 100% or in which there is presence or condensation of liquid water in the material and for temperatures ranging from 1 to 40 ° C.
- the term "material comprising neither a layer of silicate compound or soluble salt of multivalent cation, impregnated in and / or between the fibers" a raw material whose resistance in wet conditions must be improved.
- Said raw material being a material that does not contain a silicate compound or a multivalent cation salt but that may contain inorganic or organic additives.
- the term "monovalent cations” means all the cations having an oxidation state of 1, excluding cationic polyelectrolytes, in particular cationic starch and quaternary amine polymers or oligomers. .
- the material according to the present invention has the advantage of improved tensile strength over the raw material, and with respect to all the intermediate materials between the raw material and the material of the present invention, namely:
- the silicate material in combination with an alkaline earth metal,
- X is from 0.5 to 10,000
- R represents one or more cations other than a multivalent cation, in particular a mixture of alkaline and alkaline earth cations, • p represents the average positive charge of the cation (s) R, according to the formula R p + ; p being from 1 to 15,000, and in particular from 1 to 2;
- A represents the at least one multivalent cation
- N represents the positive average charge of A, according to the formula A n + , n being from 1 to 300,000, and in particular from 2 to 4 and more particularly 2, 3 or 4;
- the molar ratio between the multivalent cation in combination with the silicate compound and the negative charge carried by the silicate compound is such that 0.2 ⁇ c ⁇ n ⁇ 2, preferably 1.6 ⁇ c ⁇ n ⁇ 2.
- the formula of the silicate compound in the presence of at least one anion other than a silicate compound can be written
- R represents one or more cations other than a multivalent cation, in particular a mixture of alkaline and alkaline earth cations,
- p represents the average positive charge of the cation (s) R, according to the formula R p + ; p being from 1 to 15,000, and in particular from 1 to 2,
- • d / x represents the average number per silicon of R cations in combination with the silicate compound; A represents the at least one multivalent cation
- N represents the average positive charge of A, according to the formula A n + , n being from 1 to 300,000, and in particular from 2 to 4 and more particularly 2, 3 or 4
- J represents one or more anions other than a silicate compound
- M represents the negative average load of J, according to the formula J m , m being from 1 to 300 000,
- the molar ratio between the multivalent cation in combination with the silicate compound and the negative charge carried by the silicate compound is such that 0.2 ⁇ c ⁇ n ⁇ 2 ⁇ n, preferably 1 .6 ⁇ c ⁇ n ⁇ 2 ⁇ n.
- the amount of multivalent cations in combination with the silicate compound may be less than the amount of multivalent cations required to neutralize the negative charge of the silicate compound. In this case, the excess of negative charge carried by the silicate compound is compensated by cations different from the multivalent cations.
- the amount of multivalent cations may be greater than the amount of multivalent cations in combination with the silicate compound.
- the excess of multivalent cation remains in the salt form with one or more anions different from the species (SiO 2 ) x 0 2 of the silicate compound, and the mass ratio of the multivalent cations with respect to the silicate compound is at the maximum of 4900%.
- the present invention relates to a porous fiber material as defined above and containing or consisting of:
- one or more inorganic and / or organic additives said one or more mineral and / or organic additives possibly or not in combination with said less than one layer of silicate compound, in a proportion of 0 to 44% of the total weight of the material,
- the optional inorganic and / or organic additives, in combination with said at least one layer of silicate compound, are present in a molar ratio with respect to the silicate compound such as the positive charge carried by the mineral additive and or organic in combination with said at least one layer of silicate compound compensates for a value less than a maximum value of 90% of the negative charge carried by the silicate compound.
- the term "mineral additive” is understood to mean an inorganic compound that is insoluble in a neutral or near-neutral aqueous medium with a pH between 5 and 9, in the form of particles whose sizes are generally between 100 nm and 100 miti, can be added to the porous fiber material by all the technical means of the field (direct addition in the paper pulp, coating of the leaves, adding to the gluing press on the sheets ...) and allowing to change the properties (whiteness, grammage %) or lower the cost.
- the mineral additives include limestone, kaolin, clays ...
- organic additive is understood to mean an organic compound that is insoluble in a neutral or near-neutral aqueous medium with a pH between 5 and 9, in the form of particles whose sizes are generally between 100 nm and 100 miti, can be added to the porous fiber material by all the technical means of the field (direct addition in the paper pulp, coating of the leaves, adding to the gluing press on the sheets ...) and allowing to modify the properties.
- Organic additives include aqueous dispersions of polymers called latex and starch.
- the mineral and / or organic additives can take three configurations:
- All inorganic and / or organic additives are in combination via the positive surface charges of said mineral and / or organic additives with said layer of silicate compound,
- the set of mineral and / or organic additives is not in combination with said layer of silicate compound,
- Part of the mineral and / or organic additives is in association via the positive surface charges of said part of the mineral and / or organic additives with said layer of silicate compound, while the other part of the mineral and / or organic additives is not in combination with said layer of silicate compound.
- the present invention relates to a porous fiber material, as defined above, and wherein said or said mineral and / or organic additives are in combination via the surface positive charges of said mineral additives and or organic with said layer of silicate compound, provided that:
- the inorganic and / or organic additive or additives, in combination with said at least one layer of silicate compound, are present in a molar ratio relative to the silicate compound such that the positive charge borne by the mineral and / or organic additive combination with said at least one layer of silicate compound partially offsets the negative charge initially borne by the silicate compound, a value strictly greater than 0 to a maximum value of 90% of the negative charge carried by the silicate compound.
- the inorganic and / or organic additive (s) may or may not contain alkaline earth cations or zinc oxide.
- the present invention relates to a porous fiber material as defined above and wherein said one or more inorganic and / or organic additives are not in association with said at least one layer of compound. silicate.
- the present invention relates to a porous fiber material, as defined above and wherein:
- a part of said one or more inorganic and / or organic additives is in association via the positive surface charges of said part of the mineral and / or organic additives with said layer of silicate compound,
- the other part of said one or more inorganic and / or organic additives is not in combination with said at least one layer of silicate compound, provided that :
- a part of said one or more inorganic and / or organic additives, in combination with said at least one layer of silicate compound, is present in a molar ratio with respect to the silicate compound such as the filler borne by the part of said additive or additives; inorganic and / or organic compounds in combination with said at least one layer of silicate compound partially offsets the negative charge initially borne by the silicate compound, from a value strictly greater than 0 to a maximum value of 90% of the negative charge carried by the silicate compound.
- the inorganic and / or organic additive (s) may or may not contain alkaline earth cations or zinc oxide.
- the present invention relates to a porous fiber material as defined above and wherein said one or more inorganic and / or organic additives do not contain either alkaline earth metal cation or zinc oxide.
- the present invention relates to a porous fiber material as defined above and containing no mineral and / or organic additives.
- the invention relates to a porous fiber material comprising less than 25% by weight of mineral additive consisting of alkaline earth metal carbonates, in relation to the mass of said silicate compound.
- the invention relates to a porous fiber material not comprising carbonate.
- the material does not contain carbonate therefore:
- the invention relates to a porous fiber material comprising less than 25% by weight of zinc oxide, calcium sulphate or barium sulphate relative to the mass of said silicate compound.
- the invention relates to a porous fiber material, comprising neither zinc oxide, calcium sulfate nor barium sulfate.
- the material does not contain zinc oxide, barium sulfate or calcium sulfate, so these three compounds can not be used as mineral additives.
- the invention relates to a porous fiber material, wherein the value of wet tensile strength of said porous fiber material is from 130% to 10000% with respect to:
- the tensile strength values under wet conditions of a porous fiber material comparable to the aforesaid material comprising a soluble salt of at least one multivalent cation impregnated in and / or between the fibers but not comprising a layer of silicate compound associated with said soluble salt of at least one multivalent cation, impregnated in and / or between the fibers said value of tensile strength in wet conditions of said porous fiber material being more particularly from 150 to 3500%, and even more particularly from 200 to 1000% with respect to the tensile strength values of said materials.
- the tensile strength value in wet conditions of said porous fiber material is in particular between 130 to 200%, 200 to 300%, 300 to 400%, 400 to 500%, 500 at 600%, 600 to 700%, 700 to 800%, 800 to 900%, 900 to 1000%, 1000 to 2000%, 2000 to 4000%, 4000 to 6000%, 6000 to 8000 %, from 8000 to 10000% with respect to the tensile strength values of the following materials:
- the tensile strength value in wet conditions does not prejudge the value of the dry strength of the porous fiber material.
- the invention relates to a porous fiber material wherein said porous fiber material is selected from paper, paperboard, paper or cardboard sheets in contact with a calcium-based material and sulfate, carbonate or silicate compound.
- the porous fiber material is in the form of paper, cardboard, a mixture of paper and cardboard or a mixture of paper and / or cardboard coupled with a composite material.
- Said mixture of paper and / or cardboard coupled with a composite material may for example be a cardboard or paper covered on at least one of the two faces, a plastic film.
- the plastic film is chosen from conventional polymers such as polyethylene or polypropylene. Cardboard or paper covered with a plastic film, is potentially usable for the manufacture of a food packaging, especially for drinks, milk or ready meals.
- the invention relates to a porous fiber material, wherein the at least one multivalent cation is selected from transition metal cations, lanthanide cations, aluminum cations, or cationic polyelectrolytes. , especially cationic starches, polymers or oligomers of quaternary amine, or a mixture thereof, in particular from Al 3+ , Fe 2+ , Fe 3+ , Cu 2+ , Co 2+ , Ni 2+ , Zn 2+ , The 3+ , This 3+ .
- the multivalent cation may be either a metal cation, a cation derived from a quaternary polyamine or a cationic starch.
- the Multivalent metal cations can not be alkaline earth cations, especially calcium.
- the invention relates to a porous fiber material wherein the at least one multivalent cation is selected from transition metal, lanthanide, or aluminum cations.
- the multivalent cation can be only a metal cation and not a cation derived from a quaternary polyamine.
- the multivalent metal cations can not be alkaline earth cations, especially calcium.
- the invention relates to a porous fiber material in which the layer of silicate compound impregnated in and / or between the fibers is of average formula (Si0 2 ) x 0 2 , with a value of x less than And is a silicate.
- the layer of silicate compound impregnated in and / or between the fibers can be a layer of silicate and not of colloidal silica.
- the invention relates to a porous fiber material in which:
- the at least one layer of silicate compound impregnated in and / or between the fibers is a layer of silicate, or
- the at least one multivalent cation is chosen from transition metal, lanthanide or aluminum cations.
- the invention relates to a porous fiber material in which:
- the at least one layer of silicate compound impregnated in and / or between the fibers is a layer of silicate
- the at least one multivalent cation is chosen from transition metal, lanthanide or aluminum cations.
- the silicate compound layer impregnated in and / or between the fibers can only be a silicate layer and the multivalent cation can only be a metal cation.
- the invention relates to a porous fiber material in which the at least one multivalent cation is a mixture of at least two different multivalent cations.
- the invention relates to a porous fiber material in which the multivalent cation is selected from Al 3+ , Fe 2+ , Fe 3+ , Cu 2+ , Co 2+ , Ni 2+ , Zn 2. + , The 3+ , This 3+ .
- the multivalent cation is a metal cation selected from transition metals or aluminum.
- the multivalent cation may be divalent or trivalent.
- the invention relates to a porous fiber material, wherein the at least one multivalent cation is selected from Al 3+ , Fe 3+ and Cu 2+ .
- the invention relates to a porous fiber material, in which the at least one multivalent cation is chosen from metal polycations, in particular from:
- Metal polycations based on aluminum more particularly among polycations (AI13) 7+ or AI30, or metal polycations consisting of several different metal cations such as aluminum, zirconium, iron, copper or other transition metals.
- metal polycation is meant an aggregate consisting of several metal ions.
- An example is the Keggin cation of formula [Ali 3 0 4 (0Fi) 24 (Fl 2 0) i 2 ] 7+ , also known as AU 3 or the AI30 cation of formula [Al 3 O 4 (OH) 24 (H 2 O) 12 ] 18+ .
- the polycations are generally formed by hydrolysis and polymerization of the metal cations in a basic medium. They can also be obtained from commercial metal polymers such as polyaluminium chloride commercially available under the name WAC or PAC.
- the invention also relates to a process for preparing a porous fiber material, defined above, and comprising:
- a porous fiber material containing a soluble salt of at least one multivalent cation impregnated in and / or between the fibers with a solution of silicate compound associated with a monovalent cation, under conditions allowing an association between the above-mentioned silicate compound combined with a monovalent cation and the at least one multivalent cation.
- one or other of the above-mentioned two steps can be performed, the choice depending on the starting material.
- the process consists in impregnating this material with a multivalent cation salt to obtain the association between the silicate compound already impregnated in the fibers and the multivalent cation.
- the process then consists in bringing this material into contact with a solution of silicate compound to obtain the association between the cation (s). salt already impregnated in the fibers and the silicate compound.
- the invention relates to a process for preparing a porous fiber material comprising less than 10% zincate or aluminate with respect to the silicate compound. In a particular embodiment, the invention relates to a process for preparing a porous fiber material, not including the use of carbonate.
- the invention relates to a process for preparing a porous fiber material, not including the use of zinc oxide, calcium sulfate or barium sulfate.
- the invention relates to a process for preparing a porous fiber material, wherein said porous fiber material is selected from paper, paperboard, paper or cardboard sheets in contact with a fiber. material based on calcium and sulphate, carbonate or silicate compound.
- the method of manufacturing the porous fiber material uses the materials cited above to reinforce them. These materials are known to be particularly sensitive to water.
- the invention relates to a method for preparing a porous fiber material, as defined above, wherein said silicate compound associated with a monovalent cation is in the form (SiO 2 ) x [( R + ) 2 0], R being a monovalent cation and being chosen from alkalis or quaternary ammonium cations, and the molar ratio x being from 0.5 to 10,000, said silicate compound associated with a monovalent cation being:
- silicate when x is from 0.5 to 30, more specifically from 0.5 to 20, more specifically from 0.5 to 10, more specifically from 2 to 4, especially sodium silicate, potassium silicate, lithium silicate, tetramethylammonium silicate (TMA) or tetrabutylammonium silicate (TBA), or a mixture thereof,
- colloidal silica when x is from 30 to 10,000, more specifically from 50 to 1000, more specifically from 50 to 200, especially sodium colloidal silica, colloidal silica of potassium, lithium colloidal silica, colloidal silica TMA or colloidal silica of TBA, or mixture thereof.
- the invention relates to a process for preparing a porous fiber material, in which the silicate compound associated with a monovalent cation is selected from sodium silicate, potassium silicate, lithium silicate, tetramethylammonium silicate (TMA) or tetrabutylammonium silicate (TBA), or a mixture thereof.
- the silicate compound associated with a monovalent cation is selected from sodium silicate, potassium silicate, lithium silicate, tetramethylammonium silicate (TMA) or tetrabutylammonium silicate (TBA), or a mixture thereof.
- the monovalent cation which is used to be associated with the silicate compound may be either a cation derived from an alkaline atom, in particular chosen from sodium, lithium, and potassium, or a quaternary ammonium of formula R I R2R S R 4 N + , the R 1, R 2, R 3 and R 4 being chosen from linear alkanes of 1 to 6 carbons.
- the quaternary ammoniums are chosen from compounds of formula (R 1 ) 4 N + , in particular TMA, tetraethylammonium (TEA), tetrapropylammonium TPA or TBA.
- the invention relates to a process for preparing a porous fiber material, wherein said silicate compound associated with a monovalent cation is in the form (Si0 2 ) x R 2 0, R being a monovalent cation and being selected from alkaline or quaternary ammonium cations, including TMA, TEA, TPA and TBA, and the molar ratio x is from 0.5 to 10,000.
- the compound of formula (SiO 2) x R 20 is a silicate
- the compound of formula ( SiO 2 ) x R 2 0 is a colloidal silica
- the invention relates to a method for preparing a porous fiber material, wherein the molar ratio x of the formula (Si0 2 ) x R 2 0 of said silicate compound associated with a monovalent cation is 0.5 to 30, more precisely from 0.5 to 20, more specifically from 0.5 to 10, more specifically from 2 to 4 and in particular a ratio of 2.0; 2.1; 2.2; 2,3; 2.4; 2.5; 2.6; 2.7; 2.8; 2.9; 3.0; 3.1; 3.2; 3.3, 3.4; 3.5; 3.6; 3.7; 3.8; 3.9 and / or 4.0.
- the silicate compound associated with a monovalent cation is a silicate.
- the invention relates to a process for preparing a porous fiber material, wherein the molar ratio x of the formula (Si0 2 ) x R 2 0 of said silicate compound associated with a monovalent cation is from 30 to 10,000, more precisely from 30 to 1000, more specifically from 30 to 200.
- the silicate compound associated with a monovalent cation is a colloidal silica.
- the invention relates to a method for preparing a porous fiber material, wherein the multivalent cation is selected from the cations:
- cationic polyelectrolytes in particular cationic starches, quaternary amine polymers or oligomers
- the invention relates to a process for the preparation of a porous fiber material, in which the anion of the soluble salt is chosen from chloride, fluoride, bromide, sulphate, nitrate, perchlorate or acetate.
- the invention relates to a process for preparing a porous fiber material, wherein the soluble salt is a mixture of at least two different salts.
- the salt used in the process for bringing the multivalent cation into association with the silicate compound is a mixture of at least two salts in which at least the cations and / or the anions are different.
- the invention relates to a process for preparing a porous fiber material, wherein the soluble salt is a mixture of at least two different cations.
- the salt used in the process for bringing the multivalent cation into association with the silicate compound is a mixture of at least two salts containing or not containing the same anions and containing at least two different cations.
- the invention relates to a process for preparing a porous fiber material, comprising a step of obtaining a porous fiber material containing a layer of silicate compound associated with a monovalent cation and impregnated in and / or between the fibers consisting of:
- porous fiber material containing at least one layer of silicate compound associated with a monovalent cation and impregnated in and / or between the fibers to obtain a porous fiber material containing a layer of silicate compound associated with a monovalent cation and impregnated in and / or between the fibers and optionally dried.
- the first step is a step of bringing a layer of silicate compound into contact with the starting material.
- this step can be obtained by sizing the silicate compound on the starting material or by dipping the starting material in a solution of silicate compound.
- the contacting step can be carried out by dip coating the porous fiber material to be treated.
- the drying step is carried out in the case where there is a risk of excessive loss of silicate compound in the rest of the process in the absence of drying. Drying reduces the initial diffusion rate of the silicate compound in the salt-containing solution.
- fiber starting material means a material to be treated to improve its resistance under humid conditions and containing or consisting of:
- silicate compound in combination only with alkaline earth cations and / or monovalent cations,
- multivalent cation salts without silicate compound optionally, multivalent cation salts without silicate compound, optionally, compounds resulting from a prior treatment of the fibers, in particular cationic starch,
- the silicate compound in combination with multivalent cations.
- the invention relates to a process for preparing a porous fiber material, wherein said step of obtaining a porous fiber material containing a layer of silicate compound associated with a monovalent cation and optionally dried is followed
- the first step is a step of impregnating the multivalent cation in a material already containing at least one layer of silicate compound impregnated in and / or between the fibers.
- this step can be obtained by sizing a solution containing the salt on the porous fiber material containing a layer of silicate compound associated with a monovalent cation and impregnated in and / or between the fibers and optionally dried or dipping the porous fiber material containing a silicate compound layer associated with a monovalent cation and impregnated in and / or between the fibers and optionally dried in a multivalent cation salt solution.
- the last step of the process is a drying step to obtain a dry, usable and moisture-resistant porous fiber material.
- the invention relates to a method for preparing a porous fiber material, comprising a step of obtaining a porous fiber material containing a soluble salt of at least one multivalent cation impregnated in and / or between the fibers consisting of:
- the first step is a step of impregnating the material with the multivalent cation.
- this step can be obtained by sizing the salt of a multivalent cation on the starting material or by dipping the starting material in a solution containing the salt of a multivalent cation.
- the drying step is carried out in the case where there is a risk of excessive loss of multivalent cations in the rest of the process in the absence of drying. Drying reduces the initial diffusion rate of the cation in the solution containing the silicate compound.
- the invention relates to a process for preparing a porous fiber material, wherein said step of obtaining a porous fiber material containing a soluble salt of at least one multivalent cation impregnated in and / or between the fibers and optionally dried is followed:
- the first step is a step of contacting a silicate compound solution with a material already containing a multivalent cation salt impregnated in and / or between the fibers.
- this step can be obtained by sizing a solution containing the silicate compound on the porous fiber material containing a soluble salt of at least one multivalent cation impregnated in and / or between the fibers and optionally dried or by dipping the porous fiber material containing a soluble salt of at least one multivalent cation impregnated in and / or between the fibers and optionally dried in a solution of silicate compound.
- the contacting step may be carried out by dip coating the porous fiber material containing a soluble salt of at least one multivalent cation impregnated in and / or between the fibers to be treated.
- the last step of the process is a drying step to obtain a dry, usable and moisture-resistant porous fiber material.
- the invention relates to a process for preparing a porous fiber material, as described above, comprising: a step of contacting a porous fiber starting material with a solution of silicate compound associated with a monovalent cation, to obtain a porous fiber material containing a layer of silicate compound associated with a monovalent cation and impregnated in and / or between the fibers followed by a possible step of drying said porous fiber material containing a layer of silicate compound associated with a monovalent cation and impregnated in and / or between the fibers to obtain a porous fiber material containing a layer of silicate compound associated with a monovalent cation and impregnated in and / or between the fibers and optionally dried, followed by a step of impregnating said porous fiber material containing a silicate compound layer associated with a monovalent cation and impregnated in and / or between the fibers and optionally dried, with a solution of at least one soluble salt of
- porous fiber material containing at least one layer of silicate compound in combination with at least one multivalent cation
- step of adding a mineral and / or organic additive taking place:
- the invention relates to a process for preparing a porous fiber material, as described above, comprising: a step of impregnating a porous fiber starting material with a solution containing a soluble salt of at least one multivalent cation, to obtain a porous fiber material containing a soluble salt of at least one multivalent cation impregnated in and / or between the fibers
- porous fiber material containing at least one layer of silicate compound in combination with at least one multivalent cation
- step of adding a mineral and / or organic additive taking place:
- the invention relates to a process for preparing a porous fiber material, wherein said silicate compound associated with a monovalent cation is present in said silicate compound solution associated with a monovalent cation at a rate of 1 at 60% by weight relative to the total mass of the solution.
- the concentration of the solution depends on the chosen contacting technique. For example, in the case of the use of a gluing machine the solution must be able to be fluid enough to be spread and viscous enough to remain in contact with the fibers.
- the viscosity of the solution increases continuously as the concentration of silicate compound increases.
- the invention relates to a process for the preparation of a porous fiber material in which said step of impregnating a porous fiber starting material or a porous fiber material containing an associated material. a monovalent cation impregnated in and / or between the fibers and optionally dried, with a solution of at least one soluble salt of at least one multivalent cation is carried out at a temperature of 10 to 90 ° C and in particular at a temperature ranging from from room temperature to 50 ° C.
- the invention relates to a process for preparing a porous fiber material wherein said step of contacting a porous fiber starting material or a porous fiber material containing a salt of at least one multivalent cation impregnated in and / or between the fibers and optionally dried, with a solution of silicate compound associated with a monovalent cation is carried out at a temperature of 10 to 90 ° C and in particular at a temperature ranging from room temperature at 50 ° C.
- the temperature of contacting or impregnation depends on several factors. The choice of temperature makes it possible to vary the solubility limit of the salts in solution, the kinetics of the association reactions between the silicate compound and the multivalent cation (s) and the viscosity of the solutions.
- the invention relates to a process for preparing a porous fiber material as defined above and comprising a step of adding a mineral and / or organic additive:
- the position of the step of adding the above-mentioned mineral and / or organic additive to the process depends on the characteristics of the additive and the different steps of the process.
- the mineral additive to be added is limestone
- the soluble salt of multivalent cation is iron (III) nitrate
- the silicate compound associated with a monovalent cation of sodium silicate the step of adding the mineral additive will be placed:
- the invention relates to a process for preparing a porous fiber material, comprising:
- said contacting and impregnating steps being optionally cyclized, in particular from 1 to 50 times, for applying multiple layers of silicate compound in combination with at least one multivalent cation, followed by:
- the first step is the application of a layer of silicate compound associated with a monovalent cation, which is subsequently associated with at least one multivalent cation. After the combination of the silicate compound and the multivalent cation, the resulting material is dried. In this embodiment, obtaining a multilayer material is possible if the first two steps are cyclized (contacting and impregnation steps).
- the invention relates to a process for preparing a porous fiber material, comprising:
- the first step is the application of the multivalent cation salt layer, which is subsequently associated with the silicate compound. After the combination of the silicate compound and the multivalent cation (s), the resulting material is dried.
- obtaining a multilayer material is possible if the first two stages are cyclized (impregnation and contacting steps).
- the invention relates to a process for preparing a porous fiber material, consisting of:
- the invention relates to a process for preparing a porous fiber material, consisting of:
- the invention relates to a porous fiber material, containing or consisting of:
- the aforesaid at least one layer of silicate compound being in association with at least one multivalent cation, said combination being obtained by in situ reaction of a silicate compound combined with a monovalent cation with at least one salt at least one said multivalent cation, at a concentration of 5 to 49% of the total weight of the material,
- FIG. 1 represents the tensile strength in the direction of manufacture and in the cross direction of the paper for samples 1 to 4 and obtained according to the test of example 6,
- Figure 2 shows the percent ratio of the high and low tensile strength of the paper for samples 5 to 8 compared to the tensile strength of the sample 2, the tensile strength being obtained according to the test of example 6.
- Figure 3 shows the ratio of the tensile strength in the strong and the weak sense of the paper for samples 9 to 20 compared to the resistance to pulling of the sample 2, the tensile strengths being obtained according to the test of example 6.
- Figure 4 shows the ratio of tensile strength in the strong and weak direction of the paper for samples 21 to 37 compared to the tensile strength of the untreated Opal carton, the tensile strengths being obtained according to the tensile strength test. example 6.
- Figure 5 shows the geometric mean tensile strength measured in the machine direction and the cross-machine direction measured for samples 41 to 58 compared to the tensile strength of silicate samples 38 to 40 and untreated Whatman paper. , the tensile strengths being obtained according to the test of Example 6.
- Example 1 Comparative tests on the raw material, the silicate material, the cationic material, or the material of the invention with Whatman paper samples
- Sample 1 Raw material
- the paper has a specific gravity of 187 g per square meter; and consists of 98% cotton fibers of alpha cellulose.
- Sample 2 Silicate material (Treatment with sodium silicate only)
- a paper sample similar to Sample 1 was contacted with sodium silicate by dip coating.
- the test piece was then dried for 12 hours in ambient air.
- the weight of the test piece was increased by 18% from the initial paper weight, from 187 g / m 2 to 220 g / m 2 .
- Sample 3 Cationic material (Treatment with 0.5M copper sulfate only)
- a test piece of paper similar to sample 1 (same size, same grammage, same composition) was impregnated by soaking for 3 h in 50 ml of a 0.5 M aqueous solution of copper sulfate.
- the test specimen was applied to an absorbent paper, and then the specimen was rinsed by soaking in 100 ml of water for 1 hour 30 minutes.
- the test tube was again drained before being soaked in 100 mL of water for 3h.
- the test piece was once again dewatered and then finally dried in ambient air for 12 hours.
- the weight of the test piece was increased by 3% from the initial paper weight, from 187 g / m 2 to 192 g / m 2 .
- Sample 4 Material according to the invention (Treatment with silicate and then with 0.5M copper sulfate with rinsing).
- a sample paper similar to Sample 1 was contacted with sodium silicate by dip coating.
- test piece was impregnated by soaking for 3 h in 50 ml of a 0.5 M aqueous solution of copper sulfate. At the end of the soaking, the test piece was applied on an absorbent paper, then the test piece was rinsed by soaking in 100 ml of water for 1 h 30 min. The test tube was again drained before being soaked in 100 mL of water for 3h. The test piece was once again dewatered and then finally dried in ambient air for 12 hours.
- the weight of the test specimen was increased by 17% over the initial mass of paper, ranging from 187 g / m 2 to 219 g / m 2 .
- Example 2 Test of the order of treatment and concentration of the salt solution on Whatman paper samples
- a sample paper similar to Sample 1 was contacted with sodium silicate by dip coating.
- the test piece was then dried for 12 hours in ambient air.
- test piece was impregnated with copper sulfate by dip coating.
- Said dip coating consists of immersing said test piece in a bath containing a 0.5 M aqueous solution of copper sulphate and then removing it immediately from said bath by a vertical movement at 2 mm / s. The test piece was then dried in ambient air for 12 hours.
- the weight of the test specimen was increased by 28% of the original paper mass, ranging from 187 g / m 2 to 240 g / m 2 .
- a sample paper similar to Sample 1 was contacted with sodium silicate by dip coating.
- test piece was impregnated with copper sulfate by dip coating.
- Said dip coating consisting of immersing said test piece in a bath containing a 0.1 M aqueous solution of copper sulphate and then removing it immediately from said bath by a vertical movement at 2 mm / s. The test piece was then dried in ambient air for 12 hours.
- the weight of the test specimen was increased by 18% over the initial mass of paper, ranging from 187 g / m 2 to 220 g / m 2 .
- Sample 7 Treatment with 0.1 M copper sulfate and then with no-rinse silicate
- a sample paper similar to Sample 1 was impregnated with copper sulfate by dip coating.
- Said dip coating consists of immersing said test piece in a bath containing a 0.1 M aqueous solution of copper sulphate and then removing it immediately from said bath by a vertical movement at 2 mm / s. The test piece was then dried for 12 hours in ambient air.
- test specimen was contacted with sodium silicate by dip coating.
- the weight of the test specimen was increased by 7% over the initial mass of paper, ranging from 187 g / m 2 to 200 g / m 2 .
- a sample paper similar to Sample 1 was impregnated with copper sulfate by dip coating.
- Said dip coating consists of immersing said test piece in a bath containing a 0.5 M aqueous solution of copper sulphate and then removing it immediately from said bath by a vertical movement at 2 mm / s. The test piece was then dried for 12 hours in ambient air.
- test specimen was contacted with sodium silicate by dip coating.
- the weight of the test specimen was increased by 25% from the initial mass of paper, ranging from 187 g / m 2 to 233 g / m 2 .
- Example 3 Testing Different Salt Solutions on Whatman Paper Samples
- Sample 9 to 20 Treatment with silicate and then with a salt of multivalent cation.
- a sample paper similar to Sample 1 was contacted with sodium silicate by dip coating.
- the test piece was then dried for 12 hours in ambient air.
- test piece was impregnated by soaking for 3 h in 50 ml of a 0.5 M aqueous solution of multivalent cation salt S.
- test specimen was applied on an absorbent paper, then the test piece was rinsed by soaking in 100 ml of water for 1 h 30 min.
- the test tube was again drained before being soaked in 100 mL of water for 3h.
- the test piece was once again dewatered and then finally dried in ambient air for 12 hours.
- Table 1 List of samples tested with different multivalent cation salts on Whatman paper
- Example 4 Testing of different salt solutions on Opale cardboard samples.
- Sample 21 to 37 Treatment of a silicate board with a multivalent cation salt. An Opal 4 cm by 8 cm test piece was cut. Opale paper contains a mixture of sodium silicate and calcium carbonate with a ratio of 80/20.
- test piece was impregnated by soaking for 3 h in 50 ml of a 0.5 M aqueous solution of multivalent cation salt S. At the end of the soaking, the test piece was applied on an absorbent paper, then the test tube was rinsed by soaking in 100 mL of water for 1 hour 30 minutes. The test tube was again drained before being soaked in 100 mL of water for 3h. The test piece was once again dewatered and then finally dried in ambient air for 12 hours.
- Example 5 Testing of different salt solutions on Whatman paper samples treated with different types of silicate.
- silicate material treatment with sodium silicate, sodium metasilicate or Ludox SM30 ® is a colloidal silicate manufactured by Grace
- a 4 cm by 10 cm Whatman grade 3 test piece is cut.
- the test specimen was contacted with sodium silicate by dip coating.
- the test piece was then dried for 12 hours in ambient air.
- Samples 41-58 Treatment of silicate samples 38-40 with a multivalent cation salt.
- test piece was impregnated by soaking for 30 minutes in a 0.5 M aqueous solution of multivalent cation salt S. At the end of the soaking, the test piece was applied on an absorbent paper, then the test piece was rinsed by soaking in distilled water for 30 minutes. The test specimen was again applied to an absorbent paper before being soaked in distilled water for 30 minutes. The test piece was once again dewatered and then finally dried in ambient air for 12 hours.
- Table 3 List of tested with different silicates and with different multivalent cation salts on Whatman paper.
- a specimen was immersed in water for 1 h 30 min. At the outlet of the water, the test specimen was clamped at both ends between the clamps of a traction machine (in the sense that it is desired to test: machine direction or machine direction).
- the lower clamp is fixed while the upper clamp is connected to a force sensor the assembly "upper clamp + sensor” being able to move vertically.
- the upper clamp moves at a speed of 10 mm / min and the force sensor continuously measures the changes in force created by the resistance of the specimen to the movement of the clamp.
- the maximum force measured during displacement divided by the specimen section gives the tensile strength of the sample expressed in MPa.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
- Inorganic Fibers (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1850104A FR3076559B1 (fr) | 2018-01-05 | 2018-01-05 | Nouveau materiau a base de fibres vegetales resistant a l'humidite et son procede de preparation |
| PCT/FR2018/053569 WO2019135048A1 (fr) | 2018-01-05 | 2018-12-31 | Nouveau matériau à base de fibres végétales résistant à l'humidité et son procédé de préparation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3735490A1 true EP3735490A1 (fr) | 2020-11-11 |
| EP3735490B1 EP3735490B1 (fr) | 2022-11-09 |
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ID=63079967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18842822.1A Not-in-force EP3735490B1 (fr) | 2018-01-05 | 2018-12-31 | Nouveau matériau à base de fibres végétales résistant à l'humidité et son procédé de préparation |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3735490B1 (fr) |
| FR (1) | FR3076559B1 (fr) |
| WO (1) | WO2019135048A1 (fr) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5900116A (en) * | 1997-05-19 | 1999-05-04 | Sortwell & Co. | Method of making paper |
| US6699363B2 (en) * | 2001-11-13 | 2004-03-02 | E. I. Du Pont De Nemours And Company | Modified starch and process therefor |
-
2018
- 2018-01-05 FR FR1850104A patent/FR3076559B1/fr not_active Expired - Fee Related
- 2018-12-31 WO PCT/FR2018/053569 patent/WO2019135048A1/fr not_active Ceased
- 2018-12-31 EP EP18842822.1A patent/EP3735490B1/fr not_active Not-in-force
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019135048A1 (fr) | 2019-07-11 |
| FR3076559B1 (fr) | 2020-01-17 |
| FR3076559A1 (fr) | 2019-07-12 |
| EP3735490B1 (fr) | 2022-11-09 |
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