Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B61/00—Dyes of natural origin prepared from natural sources, e.g. vegetable sources
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
  • C09B67/0001—Post-treatment of organic pigments or dyes
  • C09B67/0002—Grinding; Milling with solid grinding or milling assistants
• • 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
  • D21H17/02—Material of vegetable origin

Definitions

• the invention relates to a method as defined in the preamble of claim 1 for making organic pigment, wherein the pigment is formed from a starting material of plant origin, and to a paper product as defined in the preamble of claim 18.
• Pigments and fillers of both mineral and organic origin are known.
• a problem with oil-based organic pigments is their price which follows the oil price development, and high production costs. Also the waste treatment of oil-based materials can be considered as one problem of making oil-based pigments.
• a problem of starch-based organic pigments and those formed from cellulose is the complexity of their production due to many production steps and therefore scarcity of their industrial production.
• the objective of the invention is to disclose a new type of method for making organic pigment from new types of organic starting materials.
• a further objective of the invention is to provide an easy and cost-effective production method for the industrial production of organic pigment.
• the method and paper product according to the invention are characterized by what has been presented in the claims.
• the invention is based on a method for making organic pigment in such manner that the organic pigment is formed from a starting material of plant origin.
• the starting material is pulverized to a suitable particle size by mechani- cal grinding in at least two grinding steps to form the organic pigment.
• the invention is specifically based on a method for making organic pigment from the starting material simply by mechanical grinding substantially without any complex chemical treatment.
• the pigment refers to a material or substance or to a mixture thereof that provides an optical property or color or brightness in a carrier, product or the like or their surface.
• the pigment may be translucent or opaque.
• the pigment referred to herein may be used as a filler, coating agent, additive or the like. In this context, the pigment does not refer to a mineral-based pigment.
• grinding refers to any grinding, pulverizing, crushing or decomposition of a mate- rial to a desired particle size.
• the operation of the grinding devices preferably mills, is typically based on applying pressure, on cutting, rubbing, compressing and/or on the effect of an impact provided by blowing, or on an equivalent operational principle. Most mills operate as a combination of many operational principles .
• the starting material is ground by a grinding method selected from the group comprising crushing-based grinding, at- trition-based grinding, cutting-based grinding, blasting-based grinding, wet grinding, dry grinding, grinding under pressure and combinations thereof.
• the applied grinder is selected from the known grinding devices, such as an impact mill, air jet mill, sand grinder, pearl mill, ball mill, vibration mill, screw mill and combinations thereof. Each grinding step may be performed by the same grinding method or alternatively by different grinding methods.
• the starting material is ground by air jet grinding, preferably by an air jet mill. Typically, in the air jet mill, air or steam which is led through the nozzles carries the material that is being pulverized.
• the starting material is ground by Cryo-grinding.
• Cryo- grinding refers to grinding which is performed at low temperatures, i.e. cold grinding.
• a grinding aid e.g. a grinding mediator, which is harder than the starting material is used in the grinding.
• the grinding aid may be e.g. a mineral compound, lime concentrate, grinding ball or the like. Grinding aids allow reducing the mean size of the particles generated during grinding. In one embodiment, grinding aid is used in an amount of 10 to 30% of the total feed material in the grinding.
• grinding is performed in at least two steps by one or more devices. In one embodiment, grinding is performed in at least two steps, so that in each step the material is ground to a predetermined particle size, e.g. to coarse and fine fractions.
• the starting material is preground in the first grinding step to a predetermined particle size before the second mechanical grinding step.
• the starting material is ground in more than two grinding steps. In one embodiment, the starting material is ground in 3 to 10 grinding steps.
• the starting material is pretreated before the first grinding step e.g. by classification, mechanically and/or chemically or in an equivalent manner.
• the pretreatment is selected from the group comprising cooling, freezing, drying, chemicalization, pre- crushing, screening the starting material, washing the starting material, removing the impurities, heat treatment, biotechnical treatment, e.g. enzymatic or micro- bial treatment, ultrasound treatment and combinations thereof.
• the starting material is treated in more than one pretreatment steps.
• the starting material is treated between the grinding steps.
• the treatment between the grinding steps is selected from the group comprising cooling, freezing, drying, chemicalization, heat treatment, biotechnical treatment, e.g. enzymatic or microbial treatment, ultrasound treatment and combina- tions thereof.
• a sorting or classifying device can be used in conjunction with the grinding before any one of the grinding steps, whereby the particles according to a predetermined particle size are conducted to the grinding.
• the starting material is dried before grinding or before a grinding step. In one embodiment, the starting material is cooled before grinding or before a grinding step. In one embodiment, the starting material is cooled to a temperature below 0°C before grinding and/or between grindings, and grinding is preferably performed at a temperature below 0 0 C. In one embodiment, cooling is performed by liquid nitrogen.
• the formed organic pigment is treated after grinding by modifying the surface properties of the pigment and thus improving the properties of the pigment in respect to different uses. In this context, surface modification may re- fer to chemical surface treatment of the pigment, to coating, covering, surface dispersing, dispersing in order to make slurry or to an equivalent modification treatment .
• the material is ground to a particle size of less than lOO ⁇ m, in one embodiment to a particle size of less than 50 ⁇ m, and in one embodi- ment to a particle size of less than 30 ⁇ m to form the organic pigment .
• a classification device is arranged in conjunction with the grinding for classify- ing the particles generated during the grinding to form a desired particle size distribution for the application.
• the moisture level of the starting material is adjusted to affect the particle size of the organic pigment that is being formed.
• the starting material of plant origin is a wood-based material.
• the wood-based material is selected from the group comprising wood bits, dust, sawdust, chips, damp wood, waste wood, fiber pulp, wood pulp, cellulose, mechanical pulp, derivatives thereof or the like or mixtures thereof.
• the starting material of plant origin is a fiber-based material.
• the fiber-based material is selected from the group comprising graminaceous plants, herbaceous plants, cereals or the like or plant bits, various aqueous or sewage sludges, sludge pulps, fiber- based industrial waste flows, starch-based materials, derivatives thereof or the like or mixtures thereof.
• the stalk part of the plants is utilized as the fiber-based material.
• the organic pigment is formed from a mixture of starting materials of plant origin which contains various starting materials of plant origin.
• the method according to the invention may be applied for use in making different kinds of pigments which are applicable in the paper industry in paper products, e.g. fine papers, newsprints, printing papers and soft tissues, in the cosmetics industry, e.g. in dental pastes, in the paint industry, hygienic product industry, plastics industry, coating industry, composite product industry, board industry or in an equivalent application.
• the organic pigment made according to the invention may be used to replace fibrous and/or abrasive constituents in some applications .
• the pigment formed according to the invention may be used either alone or in a mixture with other substances in different kinds or pigment products, mixtures, compounds or the like.
• the invention is based on a paper product which is formed from paper and which contains organic pigment made by any one of the methods pre- sented above.
• the organic pigment formed according to the invention may be used in papermaking and in a paper product as a surface treatment agent for paper, as a coating agent and/or paper filler or their component.
• paper refers to any fiber- based paper or fiber product or the like.
• the paper may have been made from chemical pulp, mechanical pulp, chemimechanical pulp, recycled pulp, fiber pulp and/or mixtures thereof or the like.
• the paper may contain suitable fillers and additives and different kinds of surface treatment and coating agents.
• the paper may be in the form of a web or a sheet, or in other form which is suitable for the purpose.
• the method according to the invention pro- vides considerable advantages compared to the prior art .
• the invention provides an industrially applicable, simple and affordable way of making organic pigment.
• the method according to the invention is easy and simple to carry out as a production process.
• the method according to the invention provides an organic pigment product with a lower grammage than in the previously known pigments.
• the organic pigment according to the invention provides cost sav- ings e.g. in transportation expenses due to the lower grammage, and in the papermaking in the form of a lower calendering pressure and reduced wearing in the equipment parts, thanks to the softer composition of the pigment .
• one advantage of the organic pigment according to the invention is recyclability . Consequently, waste problems resulting from the use of the pigment can be reduced.
• the starting material was ground in two grinding steps, wherein the first step was pregrinding.
• the starting material was preground, and the preground product was subjected to a cooling treatment before the second grinding step.
• heat treatment was applied as the treatment step after pregrind- ing, and then the second grinding step was performed.
• the starting material was preground, followed by a cooling treatment, and grinding mediators were applied in the second actual grinding step to enhance the grinding effect.
• grinding was performed in two steps, and grinding mediators were applied in the second step.
• the starting material was pretreated by drying and ground after pre- treatment in two steps. Based on the grinding tests, one could conclude that grinding in at least two steps provides extremely good quality organic pigment for use in a paper product.
• organic pigment was formed from birch dust with the average particle size of about 230 ⁇ m. Feeding moisture of the wood was arranged to be about 20%. Crushing under a pressure roller was applied as pregrinding, so that the particle size of the starting material could be halved before the second actual grinding step.
• Dust that was utilized as the starting mate- rial was mechanically ground by Cryo-grinding without aids to the particle size class d50 of less than ll ⁇ m in one step.
• the dust was cooled to a temperature of below 0°C by feeding liquid nitrogen, and cold dust was pulverized by grinding. Particles generated in conjunction with grinding were classified with a classifier.
• white-colored and hard lime concentrate with a particle size of about 100 to 200 ⁇ m was used as aid in an amount of about 20% of the fed material in the grinding performed in the above-mentioned manner, the pigment particle size class d50 of less than 8 ⁇ m was obtained.
• the average particle size was 10.14 ⁇ m.
• organic pigment was formed from spruce cutter chips with feeding moisture of about 30%.
• the starting material was first reduced by a hammer mill and then cooled and ground by an air jet mill in one step.
• the rotational speed of the classifier was l ⁇ OOOrpm.
• organic pigment was formed from birch dust.
• the starting material was first reduced by a hammer mill and then cooled at 110 0 C and ground by an air jet mill.
• the rotational speed of the classifier was 20000rpm.
• organic pigments could be formed from starting materials of plant origin by multi-step grinding. An easily industrially applicable way of making organic pigment was discovered.
• the method according to the invention is suitable in different embodiments for use in making the most different kinds of organic pigments.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Pigments, Carbon Blacks, Or Wood Stains (AREA)
• Crushing And Grinding (AREA)
• Processing Of Solid Wastes (AREA)

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• 2007
  • 2007-12-21 FI FI20075954A patent/FI20075954L/fi not_active Application Discontinuation
• 2008
  • 2008-12-19 EP EP08863785A patent/EP2235113A4/de not_active Withdrawn
  • 2008-12-19 WO PCT/FI2008/050775 patent/WO2009080894A1/en active Application Filing

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