CN102482850A - Improving strength of paper and board product - Google Patents

Improving strength of paper and board product Download PDF

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Publication number
CN102482850A
CN102482850A CN2010800221023A CN201080022102A CN102482850A CN 102482850 A CN102482850 A CN 102482850A CN 2010800221023 A CN2010800221023 A CN 2010800221023A CN 201080022102 A CN201080022102 A CN 201080022102A CN 102482850 A CN102482850 A CN 102482850A
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paper
goods
vinal
paperboard products
water
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CN102482850B (en
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T·拉蒂南
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SINOCO CHEMICALS
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    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/16—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • 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
    • D21H17/70—Inorganic compounds forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • 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
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/66—Treating discontinuous paper, e.g. sheets, blanks, rolls
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/76—Processes or apparatus for adding material to the pulp or to the paper characterised by choice of auxiliary compounds which are added separately from at least one other compound, e.g. to improve the incorporation of the latter or to obtain an enhanced combined effect
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)

Abstract

The present invention concerns a paper or a board product with an improved tensile strength comprising cellulose fibres, one or more zirconium carbonate compound(s) and water-insoluble polyvinyl alcohol fibres, and a process for manufacturing such a product, comprising the steps of forming a combined aqueous suspension of cellulose fibres and water-insoluble polyvinyl alcohol fibres, and pressing it into a paper or board product, or pressing layers of water-insoluble polyvinyl alcohol fibres and cellulose fibres into a product having a sandwich-structure, and treating the product before drying with an aqueous solution of a zirconium carbonate compound by impregnating one or more of the surfaces of the product or the complete product with the solution.

Description

Improve the intensity of paper and paperboard products
Invention field
The present invention relates to comprise the paper or the paperboard products of cellulose fibre, zirconium carbonate compound and water-insoluble vinal, and the method for preparing paper or paperboard products.
Background technology
The mechanical strength of paper and cardboard is relevant with the bondability of network of fibers.Therefore attempt to improve the strength character of paper and paperboard products through improving this bondability usually.For example this can realize through in paper or cardboard paper pulp, adding the additive that cellulose fibre is bondd each other.
Used zirconium compounds to come to improve in a way the wet tensile (strength) of the intensity, particularly paper and coating of paper and cardboard.This purposes is based on said zirconium compounds, and it has with the OH group of cellulose fibre and starch, soluble poly vinyl alcohol with as the ability of other polymer reaction of adhesive, thereby forms firm network.
Water-soluble poval (PVA) is sometimes as adhesive.Yet its shortcoming also is known.The PVA of solubility has high-hydrophilic, thereby causes water in the process of preparation paper or cardboard, to infiltrate in the PVA fiber, obtains the resistance to water of difference.Taken measures to replace solubility PVA with insoluble PVA, for example GB 1,260 028, but be found to be obtain insoluble PVA, firm used other suitable additives of crosslinked and required wet strength are debatable.
Water-insoluble PVA has been widely used in building industry, is used for improving cement based member, the intensity that can spray material and building board and toughness.Typical example is in the sprayed material in the cast concrete of fiber applications in earthquake-resistant structure, bridge, tunnel, and be used for building board to replace now for the reason of health the asbestos wool of forbidding.
The effect of insoluble PVA is based on its significant high-tensile, and when solidifying, forms the very firm ability that combines through OH key on the PVA fiber surface and concrete.
The mechanical strength of known improvement paper or paperboard products is problematic, generally includes the auxiliary agent that adds other performance degradation that causes end article because realize this improved method.And the additive of high concentration can make goods more crisp through key (fibre-to-fibre bonds), fiber and the adhesive key that weakens fiber and fiber.Therefore need new method to improve the intensity of these products.
Summary of the invention
The purpose of this invention is to provide the compared with prior art paper or the paperboard products of its improvement in performance.
Especially, the purpose of this invention is to provide and compare paper or the paperboard products that its tensile strength has improved with the prior art goods, this product can use the existing equipment in paper mill to prepare.
Of following content and claim, the present invention has realized these and other purpose, and than the advantage of known product and method.
The present invention relates to comprise the paper or the paperboard products of cellulose fibre, and the paper of preparation cellulose or the method for paperboard products.
More specifically, paper of the present invention or paperboard products are characterised in that the characteristic of claim 1 is said.
And method feature of the present invention is that the characteristic of claim 7 is said.
The present invention has a lot of advantages.Therefore the present invention provides and compares paper or the paperboard products that its tensile strength has improved with known similar products.For example the present invention uses soluble vinal, can access paper or paperboard products, compares with the intensity of for example using polypropylene fibre to obtain, and its tensile strength exceeds and reaches 3-5 doubly.
Next, the present invention further describes with specifying with reference to accompanying drawing.
The accompanying drawing summary
Fig. 1 is the cancellated figure that forms between cellulose fibre of the present invention, water-insoluble vinal and the zirconium carbonate compound, and fibring is straight line or dotted line, and zirconium carbonate is expressed as the form of its molecular structure.
Fig. 2 is the micrograph from the single fiber end that paper tape prepared according to the methods of the invention tears.
Detailed Description Of The Invention
The present invention relates to comprise the paper or the paperboard products of cellulose fibre, one or more zirconium carbonate compounds and water-insoluble vinal, and the method for preparing paper or paperboard products.
Term " paper or paperboard products " comprises the cellulosic preform goods of all fibrousness, for example paper, cardboard and preformed paper making pulp.
According to a preferred embodiment of the invention, these goods comprise one or more other conventional papermaking chemical product, are selected from coating, adhesive, filler, sizing agent, retention agent or other papermaking chemical product.This other adhesive for example can be soluble poly vinyl alcohol or starch, and said starch can be any modification or unmodified starch, preferred cationic starch, and most preferably said starch derivatives is conigenous rice, wheat, potato, cereal or cassava.Coating can be any conventional coating that uses, for example polymer coating.Filler can be an inorganic fillers, preferred calcium carbonate (for example winnofil), kaolin, talcum powder, aluminium oxide, titanium dioxide, mineral sulfates or silicate.Retention agent can be any resin or other ion or polymer retention agent.
The fibre length of the used water-insoluble polyvinyl alcohol of the present invention (PVA) fiber is 2-10mm, preferred 4-8mm, most preferably from about 5mm.They form hydrogen bond through its reactive functional groups and cellulose fibre and work, their OH group for example, thus form the cross-linked network of cellulose and vinal.This network is further strengthened through adding the zirconium carbonate compound.
Polyvinyl alcohol (PVA) can exist with various forms, for example the form of various stereoisomers.This has especially produced difference at the dissolubility aspect of performance.For the PVA of form the most usually, solubility PVA here, water is the most frequently used solvent.The PVA of this kind form especially is applied in the water-solubility membrane.Therefore term used herein " water-insoluble polyvinyl alcohol " has been described with solubility PVA commonly used and has been compared the PVA form that dissolubility is obviously poorer.
Among the present invention, the zirconium carbonate compound preferably is present in the final paper or paperboard products with the aqueous solution that is impregnated into the zirconium carbonate compound in the goods.The zirconium carbonate compound can be zirconium carbonate ammonium (AZC) or potassium zirconium carbonate (KZC).They are anionic inorganic hydroxylating zirconium polymers, exist with group water solution usually, and are applied to papermaking paint, lacquer and ink formulations, and Treatment of Metal Surface is in adhesive and the catalyst.
They work as crosslinking agent with the reaction of for example free carboxyl group and hydroxyl through zirconium.Compare with more traditional (older) Zirconium-based cross-linker, one of them advantage is: the addition of 40-70% just is enough to obtain identical cross-link intensity usually.
The reaction mechanism of used zirconium carbonate is: when maceration extract was dry, the loss of moisture caused the zirconium carbonate molecular change must be for functional group, and for example hydroxyl and responding property of carboxyl are so formed irreversible covalent bond.Temperature raises can make that this reaction is more effective.
The used traditional crosslinking agent of preparation paper or paperboard products normally comprises the organic compound of at least two functional groups that can react with the oh group of cellulosic molecule in its structure.The crosslinked firm fibre that forms, the trend that makes product restore its original shape in for example bending or alternate manner distortion back increases.Usually have thickness, brightness, light scattering efficiency and the opacity that has increased by the paper of cross filament preparation or paperboard products, and good intensity.The water retention property of paper or paperboard products also is improved through crosslinked.
Randomly, except the zirconium carbonate compound, can also use other crosslinking agent.They can be the compounds that for example comprises carboxyl, for example succinic acid, maleic acid or citric acid.
The invention still further relates to the method for preparing paper or paperboard products, goods for example of the present invention, this method may further comprise the steps:
The waterborne suspension (aqueous suspension) of the mixing of-formation cellulose fiber peacekeeping water-insoluble vinal; With usual manner it is pressed into paper or paperboard products; Perhaps the lamination of vinal and cellulose fibre is processed the goods with sandwich structure
-one or more the surfaces or the whole goods that flood these goods through the aqueous solution with the zirconium carbonate compound before dry are used these goods of this solution-treated,
-dry the goods that should handle.
The mixing waterborne suspension of this cellulose fiber peacekeeping water-insoluble vinal; Can be through directly forming with coming in these fiber mixing entry; Or the waterborne suspension through at first forming cellulose fibre and the waterborne suspension of water-insoluble vinal; Then these suspension are mixed, and it is formed the suspension that mixes and forms.
According to a preferred embodiment of the invention; Pass through powerful mixing; For example use the high speed rotational blade agitator; Form the uniform suspension of essence of cellulose fiber peacekeeping water-insoluble vinal, and it is pressed into paper or the paperboard products with essence uniform thickness, fiber can take place crosslinked then.
The waterborne suspension optimum fiber content of the cellulose fibre of the independent preparation of randomly using is 5-20g/l; 10-14g/l most preferably; And the waterborne suspension optimum fiber content of the water-insoluble vinal of the independent preparation of randomly using is 3-10g/l, most preferably 5-7g/l.
Used zirconium carbonate molecule is stable form among the present invention.Because they are complex compounds, its concentration is typically expressed as zirconia (ZrO 2) concentration.Among the present invention, the preferred 1-25wt% of this concentration, more preferably 3-15wt%, the most preferably ZrO of 3-10wt% 2
According to a preferred embodiment of the invention; The solution coat of zirconium carbonate compound is on two surfaces of express paper or paperboard products; Present in an amount at least sufficient to flood the outermost layer on surface; This solution is absorbed in the cellulosic material that gets into goods 1-95%, preferred this material that gets into 25-90% that absorbs, in most preferably absorb in this material that gets into 50-80%.This is enough to make that the tensile strength of goods significantly improves, and when whole goods are all flooded, and when limiting the amount of used solution amount to the fiber that does not weaken existing cellulose fiber peacekeeping water-insoluble vinal and the key of fiber, needs are more prudent.
According to another preferred embodiment, sandwich structure comprises the alternating layer of 2-10 vinal and cellulose fibre, preferred 3-8 alternating layer, most preferably 4-5 alternating layer.
According to special preferred embodiment, this sandwich structure comprises 3 layers, and this paper or paperboard products only comprise cellulose fibre as fiber and the formation of two superficial layers use cellulose fiber peacekeeping mixture of polyvinyl alcohol in the heart layer therein thus.
These paper products preferably the temperature that raises following, using the zirconium carbonate compound treatment before or handle after or be dried in these two stages,, temperature range can be 30-120 ℃, preferably 50-100 ℃, most preferably 70-100 ℃.
Following Example and non-limiting the present invention just are used to describe one of them preferred embodiment.
Embodiment
Embodiment 1-carries out the reaction between fiber and the potassium zirconium carbonate
Test material:
-cellulose fibre (anacidity)
-water-insoluble vinal (King ' s PVA-fiber PF-120/ fibre length 5mm/12.0 ± 0.2cN/dtex)
-potassium zirconium carbonate solution (Raisacoat KZ 20:ZrO 2Concentration 20%)
Use high speed rotational blade agitator (50 ℃) in warm water, (tearing apart) thick acid-free paper (250g/m tears 2) obtain cellulose fibre.The ratio of fiber/water is 6g/500ml.
Use identical agitator with water-insoluble vinal (King ' s PVA-fiber PF-120/ fibre length 5mm/12.0 ± 0.2cN/dtex) mix in the entry.The ratio of fiber/water is 2g/300ml.
This fibrous suspension is merged (800ml) and is mixed into uniform mixture.The suspension that obtains (cellulose and insoluble PVA) filters with metallic screen (120 order), uses vaccum suction pipe partly to remove remaining moisture, obtains moist fibre material, and it comprises a spot of starch that in paper, is used as colloidality thing (glue).
Last fibre material that in a usual manner should humidity is pressed into uniform thickness, and is dry down at 90-100 ℃.
Downcut test-strips from the material of drying, use (30% or 35%) potassium zirconium carbonate solution of dilution, KZC (Raisacoat KZ 20:ZrO 2Concentration 20%), with some test-strips thorough impregnations, it is 6% or 7% final ZrO that the carbonate solution of dilution has concentration 2Remove excessive KZC solution through this test-strips of compacting between steel plate, test-strips is 90-100 ℃ of drying.
Measurement is by the tensile strength of the test-strips of the cellulosics preparation of producing.The result is shown in the following table 1.
The tensile strength of table 1. test-strips (the test-strips width of N/mm)
Figure BPA00001481348100051
This result clearly illustrates that the fiber in zirconium carbonate compound and the cellulosic-based material reacts, and has therefore improved its intensity.Observe and only add the PVA fiber and do not having the essence effect aspect its tensile strength.This perhaps is that its cross section is very round, straight and smooth, makes them be easy to from the cellulose fibre material, pull out, because they only are between cellulose fibre, to skid off because the PVA fiber is compared with cellulose fibre.
But, formed a large amount of networks between different fibers with being reflected at of KZC and other composition (Fig. 1), cause 2.5 times the raising of reaching of its tensile strength.The strong bonding of PVA fiber and this structure can also be observed through the micro-image of tearing single fiber from test-strips and observe fiber end.This image clearly demonstrates tear (Fig. 2) of fiber itself.
Can regulate this tensile strength through the addition of adjusting water-insoluble PVA fiber and the concentration/amount of zirconium carbonate ammonium or potassium zirconium carbonate.
Embodiment 2-uses zirconium carbonate ammonium preparation experiment chamber page
In this embodiment; Dynamically preparing the laboratory page that is orientated in the sheet former (dynamic sheet former) (Formette Dynamic) according to the method for the invention; That is, form the waterborne suspension of cellulose fiber peacekeeping water-insoluble vinal, and it is pressed into used laboratory page; Through this page of this solution-treated is used with zirconium carbonate ammonium aqueous solution dipping in the page surface, with this paper page drying position of handling.This page carries out top sizing, and the paper that makes resists to be opened, tear and internal bond strength test (seeing table 2).
Used paper pulp and chemicals:
.-be refined into the eucalyptus SA paper pulp of SR 30 with Voith Labrefiner
-SEL 0.4J/m, concentration 4%, SRE 70kWh/t
.-King ' s PVA fiber PF-120/5mm
.-be used for top sizing (AZC/ starch) 7% (with ZrO 2Meter) Raisacoat AZ 20 zirconium carbonate ammoniums and the mixture of 1.5% cornstarch (food quality) in water.
The sheet forming condition:
. the target grammes per square metre 100g/m of body paper 2
. network speed 1000m/min, jet velocity 960m/min (1.6 crust)
. squeezing 1+2+3 crust
. dry down at 90 ℃
In the surface treatment of this paper, sample paper is coated with (top sizing) with painting brush, and is dry in the framework of baking oven, 80-90 ℃ of following air circulation 30 minutes, in 50% relative humidity, 23 ℃ 1 weeks of adjustment down.
The purpose of these tests is to study the influence of a small amount of PVA fiber for paper strength.Use excessive AZC to be used to guarantee the bonding fully of PVA fiber and cellulose matrix.But this is excessive optional.The amount of zirconium carbonate is optimization further, particularly when bringing up to big grade from the experimental grade of laboratory test.
Below result's (table 2) show tensile strength MD (+47-52%) and CD (+48-54%) all be improved on the direction.In the CD direction, tearing strength improve reach+57%, it is relevant with the PVA fiber content.Owing to added PVA fiber and the applying glue of AZC-starch, can find significantly improving of ScottBOND.This raising all is about 400% at MD and CD direction.In the MD direction, anti-Zhang Tingdu (tensile stiffness) improves 29%, and it is relevant with the PVA fiber content.
The performance of table 2. laboratory of the present invention page
Figure BPA00001481348100071
*Modif.Scott，(Huygen?Internal?Bond?Tester)
Test condition: 50%RH, 23 ℃
Ref: cellulose

Claims (12)

1. the paper or the paperboard products that comprise cellulose fibre is characterized in that these goods also comprise one or more zirconium carbonate compounds and water-insoluble vinal.
2. according to the paper or the paperboard products of claim 1, it is characterized in that these one or more zirconium carbonate compounds are zirconium carbonate ammonium or potassium zirconium carbonate or its mixture.
3. according to the paper or the paperboard products of claim 1 or 2, the fibre length that it is characterized in that this vinal is 2-10mm, preferred 4-8mm, most preferably from about 5mm.
4. according to each paper or paperboard products among the claim 1-3, it is characterized in that this this vinal of cellulose fiber peacekeeping is crosslinked.
5. according to each paper or paperboard products among the claim 1-4, it is characterized in that this zirconium carbonate compound concentrations is 1-25wt%, preferred 3-15wt%, most preferably 3-10wt% is expressed as ZrO 2Concentration.
6. according to each paper or paperboard products among the claim 1-5, it is characterized in that these goods also comprise one or more other coating, adhesive, filler, sizing agent, retention agent or other papermaking chemical product or its mixture.
7. preparation comprises the method for the paper or the paperboard products of cellulose fibre, it is characterized in that:
-form the waterborne suspension of the mixing of cellulose fiber peacekeeping water-insoluble vinal, it is pressed into paper or paperboard products, perhaps the lamination of water-insoluble vinal and cellulose fibre is processed paper or the paperboard products with sandwich structure,
-one or more the surfaces or the whole goods that flood these goods through the aqueous solution with the zirconium carbonate compound before dry are used these goods of this solution-treated,
-dry the goods that should handle.
8. according to the method for claim 7, it is characterized in that at first forming the waterborne suspension of cellulose fibre and the waterborne suspension of water-insoluble vinal, then these suspension are mixed, thereby form the suspension that mixes.
9. according to the method for claim 7 or 8; It is characterized in that forming the uniform suspension of essence of this this water-insoluble vinal of cellulose fiber peacekeeping through powerful mixing; It is pressed into the paper or the paperboard products of uniform thickness in fact, and makes this fiber crosslinked.
10. according to the method for claim 7, it is characterized in that 2-10 alternating layer of water-insoluble vinal and cellulose fibre being formed sandwich structure, preferred 3-8 alternating layer, most preferably 4-5 alternating layer.
11. according to each method among the claim 7-10; It is characterized in that the aqueous solution of this zirconium carbonate compound is coated on one or more surfaces of these goods; Make it can be absorbed the fibrous material of the 1-95% that gets into these goods; Preferred this material that gets into 25-90% that absorbs most preferably absorbs this material that gets into 50-80%.
12. according to each method among the claim 7-11; It is characterized in that at 30-120 ℃; Preferred 50-100 ℃; The dry goods that maybe should handle of goods that should compacting under the temperature in 70-100 ℃ of scope most preferably, or under the temperature in said scope at first dry should compacting goods and then drying be somebody's turn to do the goods that handle.
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