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
  • D21H17/01—Waste products, e.g. sludge
• • 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
  • D21H17/11—Halides
• • 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
  • D21H17/20—Macromolecular organic compounds
  • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
  • D21H17/22—Proteins
• • 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
  • D21H17/25—Cellulose
• • 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
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/59—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon
• • 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 subject of the invention is a compact "repulpable” and water-resistant material, obtained from crushed cellulosic materials.
• compact material is meant, within the meaning of the present invention, a material having sufficient cohesion and mechanical strength to be able to be used for example in the furniture industry, in the construction industry (for example for the production of panels or partitions), in the horticultural industry (for example for the production of trays for potted plants) or in the packaging industry (for example for the production of pallets, support elements, shims, spacers ).
• repulpable is meant, still within the meaning of the present invention, the property that the material can be used directly, after any grinding, as a raw material in the manufacture of paper, without requiring any operation sorting or physical, mechanical, or physicochemical separation or separation, and without generating any waste other than the waste normally produced during the manufacture of paper. Such repulpable material can therefore be introduced directly at the pulp of the paper machine, without prior sorting operation.
• the invention consists in selecting, for the manufacture of the compact materials according to the invention, products which prove to be compatible with this property of total repulpability.
• binding agents are selected on the one hand, and agents capable of imparting a certain resistance to water on the other hand, which are perfectly compatible with said repulpability property.
• binding agents is necessary in order to allow obtaining compact materials having sufficient solidity and cohesion, in particular high compressive and flexural strengths.
• binders such as polyvinyl alcohols and their derivatives, celluloses and their derivatives, lignosulfonates, starches and their derivatives, alkali silicates, clays, tars, pitches and bitumens have already been proposed.
• the Applicant Company therefore had the merit of remedying the drawbacks of the prior art and of offering a completely advantageous solution to the problems raised by the consumption of wood or wood derivatives and by the recovery and recovery of wood, paper or cardboard waste, by allowing the manufacture of compact materials, resistant to water and repulpable, based on cellulosic materials.
• the effective quantity denotes the quantity sufficient to obtain the desired effect.
• the organic binder is chosen from starches, starch derivatives, and / or starch by-products.
• the organic binder is chosen from native starches, optionally made soluble in cold water using a physical cooking-extrusion and / or gelatinization treatment on a drum.
• deproteinized waste water from a starch protein factory is preferably used.
• starch starch is preferably used.
• the deproteinized waste waters in question can be obtained in various ways, and in particular result from the treatment of potato starch effluents known to those skilled in the art under the terms “vegetable water” or " red waters ", the general principle of which is obtained is described in French patent FR 2 256 727.
• the water-resistance agent is chosen from organosilicon water-repellants, the structural unit of which corresponds to the formula: in which R and R1, which may be the same or different from each other, are hydrogen or organic radicals chosen from the group comprising: methyl, alkyl, fluoroalkyl, optionally substituted phenyl radicals, vinyl or their chlorinated derivatives, alkoxy, alkylamino, said compound being advantageously chosen from the group comprising non-reactive silicone oils, silicone resins, reactive silicone oils, especially hydroxylated, alkylated, arylated , hydroalkylated, hydroarylated as well as the mixtures of these products and the emulsions which can be prepared from these products.
• the water-repellent agent is chosen from fluorinated copolymers such as those sold by the company ELF ATOCHEM under the name FORAPERLE, and very particularly under the name FORAPERLE 321.
• the proportion of water-repellent agent is, ultimately, calculated so as to give the compact material a satisfactory water resistance, knowing that the main objective targeted by the invention is to ensure repulpability of the material obtained.
• the compact material according to the invention can optionally comprise other constituents such as by example of hardening agents, present in a proportion of 0.5 to 25%, preferably from 1 to 5% by weight relative to the weight of crushed cellulosic materials.
• the hardening agents in question can be chosen from the group of alkaline agents, more particularly from the group of hydroxides and oxides of alkali or alkaline earth metals, or from the group of salts of strong bases or weak bases, and in particular from carbonates of alkali or alkaline earth metals.
• the preferred hardening agent is hydrated lime.
• the compact material according to the invention can also comprise other constituents such as, for example, bactericides, fungicides, rat poisons ...
• the water-repellent agent is therefore distributed throughout the compact material, which makes it possible to obtain excellent water resistance.
• this water resistance can be further reinforced by applying an additional quantity of water-repellent agent to the surface of the compact material already formed, by any known technique, for example by coating, impregnation, immersion, spraying or brushing.
• a composition of matter comprising the organic binder and at least part of the water-repellent agent.
• An intimate mixture of the finely ground cellulosic materials and this material composition is produced, and this mixture is subjected to a shaping treatment, the possible part of water-repellent agent not included in the material composition being for example applied to the product. resulting from the shaping treatment.
• the nature and the proportions of the constituents are selected so that the compact material obtained has the characteristics of mechanical resistance, water resistance and repulpability indicated above.
• the compact material obtained at the end of the shaping treatment is subjected to a steaming treatment under temperature conditions generally between approximately 80-100 ° C. and about 200-220 ° C.
• the duration of this parboiling treatment depends on the temperature, but it is generally between 15 minutes and 5 hours, preferably between 30 minutes and 3 hours.
• the water-repellent agent used is a siliconate and in particular a potassium siliconate
• this steaming treatment is optional and does not constitute an essential step in the process which is the subject of the invention.
• the compact materials in accordance with the present invention indeed have in this case, by simple treatment at room temperature, the required physical characteristics and in particular a high mechanical resistance; steaming only accelerates the drying of the compact materials obtained.
• the compact material according to the invention has variable mechanical characteristics depending on the pressure which is exerted during the shaping treatment.
• a "mattress" made of cellulosic materials which is flexible and elastic.
• Such a material may be suitable, for example, in setting operations or as an anti-shock or anti-vibration product.
• the compact material obtained has very high flexural, tensile and compressive strengths and can be advantageously used as a wedging material, or even as a coil core. It can also be used as a material for the production of biodegradable and repulpable pallets. This constitutes an essential advantage of the present invention.
• Another essential advantage of the present invention lies in the fact that by selecting binding agents and water-repellent agents whose contact with foodstuffs is permitted, compact materials can be obtained which can be used, for example, as packing materials in packaging for food products or as packing materials for packaging of toys, for example.
• test pieces are then placed in a humid atmosphere, at 100% relative humidity and at 25 ° C. No disintegration was observed, even after several weeks. The mechanical strength of the test pieces remains unchanged after this stay in wet storage. The interior of the test specimens does shows no trace of moisture.
• test pieces then being placed in a humid atmosphere, at 100% relative humidity and at 25 ° C., the platelets swell after 24 hours. After 96 hours, the material no longer has any cohesion.
• test pieces being placed in a humid atmosphere, at 100% relative humidity and at 25 ° C., the platelets swell after 24 hours. After 72 hours, the material no longer has any cohesion.
• This example shows that the addition of 10% of AGGLOFROID R 009 and 3% of potassium siliconate by dry weight relative to the weight of paper waste makes it possible to obtain compact materials satisfying the requirements of the technique, namely having sufficient mechanical resistance and resistance to humidity while remaining plumpable in a stationery pulper.
• the samples thus obtained have sufficient green cohesion to undergo transport.
• test pieces After drying for 72 hours at room temperature, the test pieces are immersed in a 10% potassium siliconate solution.
• test pieces absorb 5% of said solution. After drying at room temperature, they exhibit a "pearling" effect, that is to say a repellent effect with respect to water, very marked.
• test pieces are then placed in a humid atmosphere, at 100% relative humidity and at 25 ° C. No disintegration is observed, even after several weeks. The mechanical strengths of these test pieces remain unchanged after this stay in a humid atmosphere. Likewise, the "sparkling" effect is preserved.
• test tube if a whole test tube is placed in cold water with stirring, it begins to disintegrate after 4 to 5 hours. If this plate is broken into several pieces before being placed in water, we obtain, after only two hours, a coarse paper pulp, sufficiently dispersed to be subjected to the work of a stationary disintegrator.
• a mixer of the Robot coupe type 500 g of paper waste having a particle size less than 2 mm and 500 g of paper waste having a particle size between 1 cm and 2 cm are introduced on the one hand, and on the other hand share, 200 g of a modified corn starch glue sold by the company ROQUETTE FRERES under the name AMILYS R 100, the dry matter of this glue being 35% by weight.
• the mixture is kneaded for 5 minutes then 20g of water-repellent product sold under the name HYDROFUGE 68 by RHONE POULENC is added.
• the mixture is agglomerated by molding in the form of rectangles 30 cm long, 12 cm wide, and 2 cm thick, under a pressure of 3432 104 pascals.
• the samples thus obtained have a very high green cohesion, allowing all useful manipulations.
• test pieces are then placed in a humid atmosphere, at 100% relative humidity and at 25 ° C. No disintegration is observed, even after several weeks. The mechanical resistance of the test pieces remains unchanged after this stay in a humid atmosphere. The interior of the test pieces does not show any trace of moisture upon observation.
• test tube is placed in a beaker of cold water with gentle stirring for 4 to 5 hours, it is observed that the test tube begins to swell slightly and then disintegrates. After 6 to 7 hours, a coarse paper pulp is obtained, sufficient to be worked in a stationery refiner.
• test pieces are then placed in a humid atmosphere at 100% relative humidity and at 25 ° C. There is swelling of these specimens after only 24 hours. After 96 hours, the compact material thus obtained no longer exhibits any cohesion.
• test pieces are placed in a humid atmosphere at 100% relative humidity and at 25 ° C. There is swelling of these specimens after 96 hours. After 144 hours, these test pieces have only a weak cohesion.
• Test pieces prepared under the same conditions as in Example 4 above, are immersed in a FORAPERLE 321 solution at 50%. It is found that the test pieces absorb 10% of the solution. After drying at room temperature, they have a slight “pearling” effect. On the other hand, after drying for 2 hours at 120 ° C., it is found that the "beading" effect obtained is very marked.
• Test pieces prepared under the same conditions as in Example 4 above, are immersed in a solution of pregelatinized potato starch with 5% dry matter, mixed with 20% calcium carbonate and 10% of FORAPERLE R 321. The test pieces thus absorb 5% of the solution. After drying at room temperature, these test pieces show practically no "beading" effect. On the other hand, after drying at 120 ° C for 2 hours, the "beading" effect is very marked.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Polysaccharides And Polysaccharide Derivatives (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Paper (AREA)
• Processes Of Treating Macromolecular Substances (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

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Cited By (6)

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Citations (1)

• 1994
  • 1994-01-24 FR FR9400712A patent/FR2715411B1/fr not_active Expired - Fee Related
• 1995
  • 1995-01-20 DE DE69503528T patent/DE69503528T2/de not_active Expired - Fee Related
  • 1995-01-20 EP EP95400120A patent/EP0664357B1/de not_active Expired - Lifetime
  • 1995-01-20 ES ES95400120T patent/ES2120138T3/es not_active Expired - Lifetime
  • 1995-01-20 AT AT95400120T patent/ATE168729T1/de not_active IP Right Cessation

Patent Citations (1)

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