CN102363932B - On-line surface modification method of papermaking filling material - Google Patents
On-line surface modification method of papermaking filling material Download PDFInfo
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Abstract
The invention relates to an on-line surface modification method of a papermaking filling material. The invention intends to provide a method for substantially improving the application amount of a cheap papermaking filling material and reducing the application amount of fiber during a papermaking process in order to achieve purposes of paper quality improving and production cost reducing. According to the invention, three components, which are a papermaking filling material water suspension with a concentration of 1 to 30%, a modified starch paste with a concentration of 0.5 to 2%, and a retention aid with a concentration of 0.1 to 0.3% are prepared in advance. With a filling material on-line surface-modifying jetting hybrid apparatus arranged on a paper machine on-mesh pulp delivering pipe, on-line mixing is realized, and the mixture is uniformly distributed in a papermaking pulp pipe, such that on-line surface composite modification upon the papermaking filling material can be carried out with the modified starch and the retention aid.
Description
Technical field
The present invention relates to the method for the continuously online surface modification of a kind of papermaking filler.Particularly utilize a kind of special jet mixing device modified starch and retention agent to be carried out the method for continuously online surface modification in the paper mill to papermaking filler.
Background technology
In adding the production process of filling out paper, filler generally is added in head box paper making pulp system before, and unit or double base retention agent often add a front and back to add at filler, to improve filler keeping on forming net.Add filler and not only help to improve the physical indexs such as paper opacity, whiteness, feel, printing adaptability in paper making pulp, can also accelerate the rate of drying of l Water Paper page, save the consumption of dry steam, what is more important, filler is cheap more than paper fibre, increase the use amount of filler, help to save the papermaking cost, alleviate the ecological environment load.
But the addition of filler can only remain on lower level at present, and one of them important restraining factors is the decline that the raising of filler consumption can cause paper strength.For example, the decline of the decline of paper tensile strength, folding, anti-broken, compressive property is cut, the increase etc. of hair and powder dropping degree in printing process.
A primary precondition that improves greyness of paper content is to improve the first-pass retention of filler, and it requires filler copying under the shearing of paper, turbulent flow, vacuum condition, has higher retention and water filtering performance.Retention agent is generally born the reservation function of filler, and generally adds a little front and back single-point or multiple spot to add at filler.A shortcoming of this system is retention agent with before filler contacts, and is easily caught by long fiber, fiber fines, anionic trash or other chemicals, thereby has reduced the contact probability of retention agent and filler.A kind of unavoidable way is to improve the consumption of retention agent, but the retention agent consumption increases the easily larger-diameter paper pulp floc sedimentation of generation, affects the evenness of paper, and this is to be unwilling in paper-making process to see.
Usually the raising of greyness of paper content can cause the decline of paper strength, is because the minimizing of proportion of fibers causes the minimizing of Hydrogenbond point quantity between fiber on the one hand; Be because filler itself does not have hydrogen bond on the other hand, can not form Hydrogenbond power between filler and filler or between filler and fiber, and filler is clipped between fiber and fiber, spatially also stoped fiber and interfibrous Hydrogenbond.
Water miscible natural or synthetic base polymer often is used as and adds the reinforcing agent use of filling out paper.Modified starch is wherein to be most widely used, and one of the most economic enhancing of cost and retention agent.Modified starch especially cationic starch or amphoteric starch can be obtained comparatively desirable enhancing, retention, sizing agent emulsification texts through being used for papermaking after boiling.In the production process of cardboard, spray starch is often used as the interlaminar improvement agent.Can both reach comparatively desirable interlaminar improvement effect without the spray starch of swelling or the spray starch of process part swelling, because under the condition that has water to exist, spray starch can obtain enough gel heats from the paper machine dryer position.But the most interlayers that are distributed in paper and paper of concentrating of these spray starch are difficult to reach the effect that improves the paper overall enhanced.
Based on above background, stuffing surface modification is the reasonable approach that increases the papermaking filler consumption.CN02159775.8 discloses a kind of preparation method of modifier for papermaking filler, this patent uses colloid silicon as main modifier, papermaking filler is carried out surface modification, then the papermaking filler of surface modification is added in paper and keeps 75～85% higher actual retention with 20～60% high dosage, make simultaneously the indices of paper satisfy related standards, and some indexs are optimized.CN200810017751.9 discloses a kind of preparation method of corpuscle filling material-starch complexes papermaking filling material, at first, starch or starch conversion thing solution and particulate filler blend boiling is stirred react; Add the crosslinking agent reaction in reactant liquor, add ammonium sulfate in reactant liquor, separate out sediment; The sediment that collection is separated out, with its rinsing, drying, cooling, be ground into granularity and be not more than 80 purpose particles.But the corpuscle filling material-starch complexes papermaking filling material part substituted plant fiber of the present invention's preparation is as papermaking filler, the weight that accounts for paper product during use is 5～35%, but best results is 8～25%, by the paper product that adopts these filler Substitute For Partial strings to produce, this filler can significantly improve physical property and the optical property of paper product, and improves with the increase of synthetic content in paper.CN200810154080.0 discloses a kind of method of processing calcium carbonate by modifying starch, take starch as raw material, takes starch 2.5 grams～7.5 grams, be mixed with 5%～10% solution, add the modifier of 0.2～0.7 gram, transfer to pH=9 with 1M NaOH, under 60 ℃, stir 30～40min.Add the calcium carbonate of 15～30 grams in superincumbent reactant liquor, heat boiling under 70～80 ℃ of stirrings, reaction time 20～40min.Transfer to pH=7 with 1M hydrochloric acid after reaction.In baking oven heat drying, cooling, be ground into 100 purpose particles both filler.The papermaking filler of the present invention's preparation has higher retention, and fracture length, burst index are greatly improved.Can improve the intensity of paper, but Partial Replacement lumber fibre and play the effect of protection of the environment reduces the cost of papermaking, improves the serviceability of paper.CN200910070785.9 discloses a kind of method of modifying of paper filler-calcium carbonate, and described method of modifying comprises the following steps: one, the preparation of winnofil (PCC) dispersion liquid; Two, control PCC and cationic styrene-acrylic acid ester emulsion reaction condition; Three, by obtaining modification PCC after cooling precipitation.In modifying process, PCC and cationic styrene-acrylate mass ratio is 75: 1, temperature 70 C, and the embedding rate of cationic styrene-acrylate modified PCC is near 99%.Modification PCC of the present invention is as papermaking filler, its amount of filling scope is 10%～45% (based on oven dry stock), composite use adds and fills out paper making wet part together with double base retention agent cationic polyacrylamide, cationic starch, not only improve greyness of paper content, and improved optical property and the physical property of paper.Method of modifying of the present invention is simple, easy operating, and processing cost is lower, and effectively reduces protofibre consumption and production cost.
From disclosed papermaking filler surface modifying method, basically be the method that adopts step starch sedimentation or crosslinked coating papermaking filler, after surface modification by complexity, obtain the surface modifying stuffing of commercial form through steps such as heat drying, cooling, pulverizing.The surface modifying stuffing complex process that this class way obtains, production cost is high, and quality is stable not, is difficult to realize the commercialization large-scale application.
Summary of the invention
The technical issues that need to address of the present invention are, overcome the deficiencies in the prior art, propose a kind ofly to carry out continuously the new method of stuffing surface modification at the papermaking scene, utilize jet mixing device that modified starch and retention agent are carried out surface modification to papermaking filler, considered strengthening the property and retention property of papermaking filler, the cheap papermaking filler consumption of increase that can be by a relatively large margin, reduce the consumption of fiber in paper-making process, improving to reach the purpose that paper quality reduces production costs, is a kind of comparatively desirable environmental protection technique.
The method of the online surface modification of papermaking filler of the present invention,
1) prepare in advance the papermaking filler water slurry of 1～30% concentration; Described papermaking filler water slurry is selected from the water slurry of (but being not limited to) calcium carbonate (GCC/PCC), talcum powder, kaolin or titanium dioxide, or one or more the mixture in paper waste precipitation mud.When selecting filler, need to consider in paper technology the requirement to aspects such as pH value, packing material sizes.
Prepare in advance concentration and be 0.5%～2% modified starch and stick with paste liquid; Modified starch is stuck with paste cationic starch, anionic starch, amphoteric starch or the poly modified starch (being preferably cationic starch and poly modified starch) that the liquid raw material is selected from (but being not limited to) cornstarch, tapioca, farina, wheaten starch modification; It is 1%～10% of papermaking filler water slurry over dry consumption that modified starch is stuck with paste liquid over dry consumption, (preferred consumption be filler over dry consumption 4%～7%); Modified starch stick with paste the preparation of liquid adopt (including, but not limited to) continuously stewing or batch (-type) boiling or use alkaline chemical to carry out part swelling or the gelatinized corn starch liquid of gelatinization fully to starch.Different starch materials, the boiling temperature that the modified starch of different modification mode and different modification degree need to be controlled are all different (generally 90
oC-130
oC).
The increase of papermaking filler consumption can make paper strength and first-pass retention descend, and therefore, the method that papermaking filler is carried out surface modification need to be taken into account and strengthen and the factor of retention two aspects.The present invention uses modified starch as the main enhancing chemicals of papermaking filler surface modification.
Do not have starch first-pass retention in the paper pulp system of gelatinization very low, generally only have 15% left and right, do not possess the value that business is used.Therefore after needing boiling, could use the starch that adds in paper pulp wet end system.Poly modified starch is wherein first-selected modified starch, and the cationization of starch can adopt wet method, solvent method, dry method and semidry method manufacturing, and CATION etherificate base substituting group substitution value DS reaches 0.015～0.050.The CATION substitution value is higher, and modified starch is better to the covering property of filler, but simultaneously also needs to consider the Zeta potential of slurry system, and the filler flocculation is the size etc. of grain round and round.Preferred CATION etherificate base substituting group substitution value DS is 0.020～0.040.
Prepare in advance concentration and be 0.1%～0.3% retention agent; Described retention agent is selected from the carboxymethyl cellulose (being preferably cationic polyacrylamide) of (but being not limited to) cationic polyacrylamide, anionic polyacrylamide, modification or non-modification; The consumption that retention agent is suitable is 10～100ppm of papermaking filler water slurry over dry consumption, and (preferred consumption is 20～50ppm) of amount of filler;
Above-mentioned preferred modified starch and consumption thereof, preferred retention agent and consumption thereof are conducive to obtain " filler---modified starch---retention agent " Trinitarian little flocculation structure more closely.
2) jet mixing device is a kind of venturi jet mixing device of coaxial distribution, and A, B, three coaxial injectors of C are divided into a, b, c, d totally 4 chambers with space region, a is the injection stream body cavity, b is the chemicals fluid cavity, and c is the erratic flow fluid cavity, and d is the turbulent flow mixed zone; Injection stream, chemicals stream, erratic flow obtain expulsion pressure at a, b, c in the chamber respectively;
Jet mixing device is the key that realizes the online surface modification of filler.A chamber venturi-type eductors fluid line speed is 10～25 meter per seconds, and preferred injector a fluid line speed is 16～20 meter per seconds, and the injection stream flow is larger, and fluid-mixing is far away in the distribution of axial direction.B chamber venturi-type eductors chemicals range of flow is according to the consumption of chemicals and concentration and decide.C chamber venturi-type eductors erratic flow flow is 0.5～5 cube m/h, and the erratic flow flow is larger, and fluid-mixing is wider in the distribution of cross-wise direction.The d district is the turbulent flow mixed zone, and injection stream, chemicals stream, erratic flow and paper pulp are realized evenly mixing in this zone.
Injection stream and erratic flow preferably use papermaking online slurry or mthod of white water from paper making, take saving clear water resource and as the required heat resource of heating clear water.In order to obtain desirable expulsion pressure and flow velocity, can use centrifugal pump or screw pump to pressurize as injection stream and erratic flow, in order to obtain the chemicals flow of accurate measurement, can use measuring pump or screw pump to measure interpolation to chemicals.
3) three kinds of components above-mentioned 1) realize on-line mixing and are evenly distributed in the paper making pulp pipeline by the jet mixing device that a cover is arranged on paper machine online fluid-conveying pipe road:
The papermaking filler water slurry is injected by injection stream body cavity a, and its linear velocity is 10～25 meter per seconds, and injection flow is 3～10 cubes m/hs (preferred speed is 16～20 meter per seconds, and preferred injection stream flow is 5～8 cubes m/hs); In order to obtain desirable injection flow and spray line speed, can extract continuously paper pulp out from the paper pulp pipeline, after the booster pump supercharging, drive the papermaking filler water slurry and jointly inject by the injection stream body cavity;
Modified starch is stuck with paste liquid and retention agent forms the online modified chemical product of filler jointly, and b injects by the chemicals fluid cavity, and the papermaking filler in the regional opposing jet of d carries out surface coating modification.
The erratic flow fluid is directly to extract and pass through the paper pulp of force (forcing) pump pressurization from the paper making pulp pipeline out, and c injects from the erratic flow fluid cavity; Different according to the radiation scope of erratic flow effect, flow velocity and the flow of adjusting erratic flow fluid, the flow velocity of erratic flow fluid is 1～4 meter per second, flow is 0.5～5 cube m/h (preferred flow velocity is 2～3 meter per seconds, and flow is 2～3 cubes m/hs).Under d area spray stream, the effect of chemicals stream at erratic flow, change fluid motion direction and speed, form desirable even distribution effect in paper making wet part paper pulp pipeline.
When jet mixing device was arranged on paper machine paper pulp pipeline, papermaking filler was metered into online slurry or the rare plain boiled water in injection stream, jointly forms the main injection medium.Modified starch and retention agent be as the main medium of chemicals stream, mutually mixes with filler at the intersectional region of injection stream and chemicals stream.Retention agent is coated on papermaking filler and modified starch in a metastable little flocculation granule.Erratic flow is one fluid that sprays from the uniform hole in the side of the bottom of erratic flow injector, " Water curtain wall " that it forms forms disorderly turbulent fluid with injection stream, chemicals stream and paper pulp stream, the little flocculation of the filler of surface modification group is evenly distributed in paper pulp, is sent to head box and copies paper.This little flocculation is rolled into a ball and no longer be subject to the strong shear actions such as pulp pump, pressurized screen before being entered head box.Therefore, the first-pass retention of little flocculation group is higher.
Perhaps, three kinds of components above-mentioned 1) realize on-line mixing and are evenly distributed in the paper making pulp pipeline by two cover jet mixing devices:
Before the first set jet mixing device was arranged on paper machine online pressurized screen, the papermaking filler water slurry was injected by injection stream body cavity a, and its linear velocity is 10～25 meter per seconds, and injection flow is 3～10 cubes m/hs; Modified starch is stuck with paste liquid and is injected by chemicals fluid cavity b as the online modified chemical product of filler, and its flow is by 1) Determination of quantity, make modified starch carry out the online surface modification of one-level to papermaking filler; The erratic flow fluid is directly to extract and pass through the paper pulp of force (forcing) pump pressurization from the paper making pulp pipeline out, and c injects from the erratic flow fluid cavity; The flow velocity that the erratic flow fluid is suitable is 1～4 meter per second, and flow is 0.5～5 cube m/h (preferred flow velocity is 2～3 meter per seconds, and range of flow is 2～3 cubes m/hs).Injection stream, chemicals flow under the effect of erratic flow, change fluid motion direction and speed, form desirable even distribution effect in paper making wet part paper pulp pipeline.
The second cover jet mixing device is arranged on, 1～6 meter, downstream of first set jet mixing device, injection stream in the second cover jet mixing device and erratic flow are the paper pulp after the force (forcing) pump pressurization, inject from injection stream chamber a and erratic flow chamber c respectively, spraying the fluid linear velocity is 10～25 meter per seconds, injection flow is 3～10 cubes m/hs, the flow velocity that the erratic flow fluid is suitable is 1～4 meter per second, and flow is 0.5～5 cube m/h; In the second cover jet mixing device, retention agent is injected by chemicals fluid cavity b, and its flow is by 1) Determination of quantity.Make retention agent carry out further retention Combined Processing to the filler through first order surface modification, finally realize the continuously online surface modification of papermaking filler and application.
When jet mixing device is arranged on respectively before the wet end of machine pressurized screen and afterwards during two place diverse locations, the jet mixing device before pressurized screen is metered into online slurry or rare plain boiled water in injection stream with papermaking filler, jointly forms the main injection medium.Modified starch is as the main medium of chemicals stream, mutually mixes with filler at the intersectional region of injection stream and chemicals stream.Through after the further mixing of pressurized screen, the jet mixing device after pressurized screen is coated on retention agent and fibre stuff, papermaking filler and modified starch in a metastable little flocculation granule.Then jointly be sent to head box and copy paper.Filler during this little flocculation is rolled into a ball has passed through the dispersion of pressurized screen, and filler is more even in the distribution of paper the inside.
Compare with disclosed papermaking filler surface modification patent; what the present invention proposed carries out the new method of stuffing surface modification continuously at the papermaking scene; the complex surface modification programs such as heat drying in filler modified process, cooling, pulverizing have been reduced; whole modifying process is directly completed at the papermaking scene; has cost low; easily manufactured; steady quality; be applicable to the characteristics such as application of Large Paper Machine; can significantly improve machinery and the optical property of paper, but and the Partial Replacement lumber fibre play the effect of protection of the environment.
Modified starch of the present invention is stuck with paste liquid and is had that anti-interference is good, the filler retention advantages of higher.Compare with the paper technology of tradition without stuffing surface modification, method of modifying major advantage of the present invention has: improved paper surface and internal bond strength, saved fiber consumption, improved the content of ashes of paper; Technique is simple, and is actual workable, steady quality, and cost is lower.
Description of drawings
Fig. 1 is process route view of the present invention.
The specific embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1:
This example is the single ply board machine hand skill under typical laboratory condition.
Prepare:
Do not float softwood pulp and useless boxboard paper pulp discongests in the ratio of 20:80 the mixed pulp that is prepared into 1% concentration jointly, the pulp beating degree is 50 degree.Filler is selected powdered whiting (GCC), and several 200 orders of filler order select cationic starch substitution value DS:0.020, and retention agent is selected cationic polyacrylamide, cationization mol ratio 15%, molecular weight 8,000,000.
Operating procedure:
Open the agitator of laboratory with slurry groove, then 60 rev/mins of mixing speeds add 314 gram clear water successively, 3.14 gram mixed pulps, 0.03 gram cationic starch, 0.47 gram filler, 50ppm cationic polyacrylamide etc.The moulding of after stirring, the slurry for preparing being manufactured paper with pulp in the handmade paper forming machine of laboratory, pattern is tested the related physical index after the steps such as press dewatering, drying, balance.
In the dynamic drainage instrument of laboratory, the above-mentioned slurry for preparing is carried out dynamic drainage, test its total initial journey retention rate and filler initial journey retention rate.
Embodiment 2:
This example is for using machine hand's skill of jet mixing device slurrying and the single ply board of manufacturing paper with pulp under laboratory condition.
Prepare:
With embodiment 1.
Operating procedure:
Open the laboratory jet mixing device, add 314 kilograms of clear water and 3.14 kilograms of mixed pulps, then, adjust the injection stream flow velocity and reach 18 meter per seconds, adjust the erratic flow flow velocity and reach 3 meter per seconds.Then add simultaneously 31.4 gram cationic starches by jet mixing device, 471 gram fillers, and the 50ppm cationic polyacrylamide etc.Spray to mix complete after, take out the wet pulp with embodiment one identical oven dry weight from the slurry for preparing, the moulding of manufacturing paper with pulp in the handmade paper forming machine of laboratory, pattern is tested the related physical index after the steps such as press dewatering, drying, balance.
In the dynamic drainage instrument of laboratory, the above-mentioned slurry for preparing is carried out dynamic drainage, test its total initial journey retention rate and filler initial journey retention rate.
For embodiment 1, embodiment 2 shows, use through spraying the filler of blending surface modification, become that paper ash divides, when filler and total first-pass retention obviously improve, become not corresponding decline of paper physical strength, show that on-the-spot continuous surface modified filler obtained desirable effect.
Embodiment 3:
This example is the wood-free paper machine hand skill under typical laboratory condition.
Prepare:
Bleaching needle-point leaf pulp and bleached hardwood pulp and bleached wheat straw pulp discongest in the ratio of 20:30:50 the mixed pulp that is prepared into 1% concentration jointly, and the pulp beating degree is 40 degree.Filler is selected powdered whiting (GCC), several 200 orders of filler order, and cationic starch adopts the gelatinization of abundant gelatinization method, CATION substitution value DS:0.030, retention agent is selected cationic polyacrylamide, cationization mol ratio 15%, molecular weight 8,000,000.
Operating procedure:
Open the agitator of laboratory with slurry groove, then 60 rev/mins of mixing speeds add 200 gram clear water successively, 2.20 gram mixed pulps, 0.02 gram cationic starch, 0.44 gram filler, 50ppm cationic polyacrylamide etc.The moulding of after stirring, the slurry for preparing being manufactured paper with pulp in the handmade paper forming machine of laboratory, pattern through press dewatering, drying, top sizing, after test related physical index after the steps such as drying, balance.
In the dynamic drainage instrument of laboratory, the above-mentioned slurry for preparing is carried out dynamic drainage, test its total initial journey retention rate and filler initial journey retention rate.
Embodiment 4:
This example is for using machine hand's skill of jet mixing device slurrying and the wood-free paper of manufacturing paper with pulp under laboratory condition.
Prepare:
With embodiment 2.
Operating procedure:
Open the laboratory jet mixing device, add 200 kilograms of clear water and 2.2 kilograms of mixed pulps, then, adjust the injection stream flow velocity and reach 18 meter per seconds, adjust the erratic flow flow velocity and reach 3 meter per seconds.Then add simultaneously 20 gram cationic starches by jet mixing device, 440 gram fillers, and the 50ppm cationic polyacrylamide etc.After the injection mixing is completed, take out the wet pulp with embodiment three identical oven dry weights from the slurry for preparing, the moulding of manufacturing paper with pulp in the handmade paper forming machine of laboratory, pattern through press dewatering, drying, top sizing, after test related physical index after the steps such as drying, balance.
In the dynamic drainage instrument of laboratory, the above-mentioned slurry for preparing is carried out dynamic drainage, test its total initial journey retention rate and filler initial journey retention rate.
For embodiment 3, embodiment 4 shows, use in wood-free paper through spraying the filler of blending surface modification, become that paper ash divides, filler and total first-pass retention, when beating degree is obviously improved, become not corresponding decline of paper physical strength, show that on-the-spot continuous surface modified filler obtained desirable effect.
Embodiment 5:
This example is the electro-photographic paper machine hand skill under typical laboratory condition.
Prepare:
Bleaching needle-point leaf pulp and bleached hardwood pulp discongest in the ratio of 30:70 the mixed pulp that is prepared into 1% concentration jointly, and the pulp beating degree is 40 degree.Filler is selected powdered whiting (GCC), several 200 orders of filler order, poly modified starch adopts the gelatinization of abundant gelatinization method, CATION substitution value DS:0.040, also contain simultaneously anionic group and synergy group in poly modified starch, retention agent is selected cationic polyacrylamide, cationization mol ratio 15%, molecular weight 8,000,000.
Operating procedure:
Open the agitator of laboratory with slurry groove, then 60 rev/mins of mixing speeds add 200 gram clear water successively, and 2.20 gram mixed pulps, oven dry weight are the poly modified starch of the complete gelatinization of 0.02 gram, 1.12 gram fillers, 50ppm cationic polyacrylamide etc.The moulding of after stirring, the slurry for preparing being manufactured paper with pulp in the handmade paper forming machine of laboratory, pattern through press dewatering, drying, top sizing, after test related physical index after the steps such as drying, balance.
In the dynamic drainage instrument of laboratory, the above-mentioned slurry for preparing is carried out dynamic drainage, test its total initial journey retention rate and filler initial journey retention rate.
Embodiment 6:
This example is for using machine hand's skill of jet mixing device slurrying and the electro-photographic paper of manufacturing paper with pulp under laboratory condition.
Prepare:
With embodiment 5.
Operating procedure:
Open the laboratory jet mixing device, add 200 kilograms of clear water and 2.20 kilograms of mixed pulps, then, adjust the injection stream flow velocity and reach 18 meter per seconds, adjust the erratic flow flow velocity and reach 3 meter per seconds.Then adding simultaneously oven dry weight by jet mixing device is the poly modified starch of the complete gelatinization of 20 grams, 1120 gram fillers, and the 50ppm cationic polyacrylamide etc.After the injection mixing is completed, take out a certain amount of wet pulp from the slurry for preparing, the oven dry weight of wet pulp is to control last handsheet quantitatively at 70 ± 2.5 g/m
2State's scalar quantity scope in be as the criterion, the moulding of manufacturing paper with pulp in the handmade paper forming machine of laboratory, pattern through press dewatering, drying, top sizing, after test related physical index after the steps such as drying, balance.
In the dynamic drainage instrument of laboratory, the above-mentioned slurry for preparing is carried out dynamic drainage, test its total initial journey retention rate and filler initial journey retention rate.
For embodiment 5, embodiment 6 shows, use in electro-photographic paper through spraying the filler of blending surface modification, become that paper ash divides, filler and total first-pass retention, when beating degree is obviously improved, become not corresponding decline of paper physical strength, show that on-the-spot continuous surface modified filler also can obtain desirable effect in the grey separation kind of height.
Claims (2)
1. the method for the online surface modification of papermaking filler, is characterized in that
1) prepare in advance the papermaking filler water slurry of 1～30% concentration, described papermaking filler water slurry is selected from the water slurry of calcium carbonate, talcum powder, kaolin or titanium dioxide, or one or more the mixture in paper waste precipitation mud;
Prepare in advance concentration and be 0.5%～2% modified starch and stick with paste liquid, modified starch is stuck with paste cationic starch, anionic starch, amphoteric starch or the poly modified starch that the liquid raw material is selected from cornstarch, tapioca, farina, wheaten starch modification; It is 1%～10% of papermaking filler water slurry over dry consumption that modified starch is stuck with paste liquid over dry consumption; Modified starch is stuck with paste the preparation of liquid and is adopted continuously stewing or batch (-type) boiling, controls the degree of swelling of gelatinized corn starch liquid by adjusting boiling temperature;
Prepare in advance concentration and be 0.1%～0.3% retention agent, described retention agent is selected from the carboxymethyl cellulose of cationic polyacrylamide, anionic polyacrylamide, modification or non-modification; The consumption of retention agent is 10～100ppm of papermaking filler water slurry over dry consumption;
2) the online surface modification jet mixing device of filler, it is a kind of venturi jet mixing device of coaxial distribution, A, B, three coaxial injectors of C are divided into a, b, c, d totally 4 chambers with space region, a is the injection stream body cavity, b is the chemicals fluid cavity, c is the erratic flow fluid cavity, and d is the turbulent flow mixed zone;
3) three kinds of components above-mentioned 1) realize on-line mixing and are evenly distributed in the paper making pulp pipeline by the online surface modification jet mixing device of filler that a cover is arranged on paper machine online fluid-conveying pipe road:
The papermaking filler water slurry is injected by injection stream body cavity a, and its linear velocity is 10～25 meter per seconds, and injection flow is 3～10 cubes m/hs; In order to obtain desirable injection flow and spray line speed, extract continuously paper pulp out from the paper pulp pipeline, after the booster pump supercharging, drive the papermaking filler water slurry and jointly inject by the injection stream body cavity;
Modified starch is stuck with paste liquid and retention agent forms the online modified chemical product of filler jointly, and b injects by the chemicals fluid cavity, and its flow is by 1) Determination of quantity, modified starch and retention agent are carried out surface recombination modified online to papermaking filler;
The erratic flow fluid is directly to extract and pass through the paper pulp of force (forcing) pump pressurization from the paper making pulp pipeline out, and c injects from the erratic flow fluid cavity; The flow velocity of erratic flow fluid is 1～4 meter per second, and range of flow is 0.5～5 cube m/h;
Injection stream, chemicals flow under the effect of erratic flow, change fluid motion direction and speed, form desirable even distribution effect in paper making wet part paper pulp pipeline;
Perhaps, three kinds of components above-mentioned 1) realize on-line mixing and are evenly distributed in the paper making pulp pipeline by the two online surface modification jet mixing devices of cover filler:
Before the first set jet mixing device was arranged on paper machine online pressurized screen, the papermaking filler water slurry was injected by injection stream body cavity a, and its linear velocity is 10～25 meter per seconds, and injection flow is 3～10 cubes m/hs; Modified starch is stuck with paste liquid and is injected by chemicals fluid cavity b as the online modified chemical product of filler, and its flow is by 1) Determination of quantity;
Make modified starch carry out the online surface modification of one-level to papermaking filler; The erratic flow fluid is directly to extract and pass through the paper pulp of force (forcing) pump pressurization from the paper making pulp pipeline out, and c injects from the erratic flow fluid cavity; The flow velocity that the erratic flow fluid is suitable is 1～4 meter per second, and flow is 0.5～5 cube m/h;
The second cover jet mixing device is arranged on, 1～6 meter, downstream of first set jet mixing device, injection stream in the second cover jet mixing device and erratic flow are the paper pulp after the force (forcing) pump pressurization, inject from injection stream chamber a and erratic flow chamber c respectively, spraying the fluid linear velocity is 10～25 meter per seconds, injection flow is 3～10 cubes m/hs, the flow velocity that the erratic flow fluid is suitable is 1～4 meter per second, and flow is 0.5～5 cube m/h; In the second cover jet mixing device, retention agent is injected by chemicals fluid cavity b, and its flow is by 1) Determination of quantity.
2. the method for the online surface modification of papermaking filler according to claim 1, is characterized in that
1) in, it is 4%～7% of filler over dry consumption that described modified starch is stuck with paste liquid over dry consumption; Described retention agent consumption is 20～50ppm of papermaking filler water slurry over dry consumption;
3) the preferred linear velocity of described papermaking filler water slurry is 16～20 meter per seconds, and described injection stream range of flow is 5～8 cubes m/hs; The flow velocity of described erratic flow fluid is 2～3 meter per seconds, and flow is 2～3 cubes m/hs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110296959 CN102363932B (en) | 2011-09-30 | 2011-09-30 | On-line surface modification method of papermaking filling material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110296959 CN102363932B (en) | 2011-09-30 | 2011-09-30 | On-line surface modification method of papermaking filling material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102363932A CN102363932A (en) | 2012-02-29 |
| CN102363932B true CN102363932B (en) | 2013-06-05 |
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| EP2662418B1 (en) * | 2012-05-11 | 2015-02-18 | Omya International AG | Sustainable adsorbable polymers |
| EP2662417B1 (en) * | 2012-05-11 | 2015-10-28 | Omya International AG | Starch-based phch |
| DK2662416T3 (en) * | 2012-05-11 | 2015-10-05 | Omya Int Ag | Treatment of calcium carbonate containing materials to the increased filler loading in the paper |
| CN102720092B (en) * | 2012-06-12 | 2014-04-16 | 陕西科技大学 | Method for improving performance of finished paper |
| CN103073926A (en) * | 2012-12-24 | 2013-05-01 | 华泰集团有限公司 | Manufacturing method of cationic starch modified calcium carbonate filler |
| CN103469676B (en) * | 2013-09-06 | 2015-11-25 | 金红叶纸业集团有限公司 | Filler treatment process and paper technology |
| CN106149459A (en) * | 2015-03-31 | 2016-11-23 | 上海东升新材料有限公司 | A kind of paper grade (stock) height retains filler and preparation method thereof |
| CN106320064B (en) * | 2016-08-31 | 2018-09-25 | 江苏理文造纸有限公司 | The production method of paper grade (stock) filler |
| CN106351060A (en) * | 2016-08-31 | 2017-01-25 | 江苏理文造纸有限公司 | Workmanship of white flour craft paper wrapping type padding |
| CN114561833A (en) * | 2022-02-28 | 2022-05-31 | 山东博汇纸业股份有限公司 | Production method of single-layer white pulp fine dried noodle white-surface kraft liner board |
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| PT1492923E (en) * | 2002-04-09 | 2008-06-12 | Fpinnovations | Swollen starch-latex compositions for use in papermaking |
| CN1664233A (en) * | 2005-02-18 | 2005-09-07 | 姚茜 | Method for adding particulate retention filter aid in paper making process |
| CN101634120B (en) * | 2009-08-25 | 2011-12-28 | 陕西科技大学 | Method for improving performance of paper stock in retention and drainage aiding |
| CN101806017B (en) * | 2010-04-07 | 2012-04-18 | 浙江凯恩特种材料股份有限公司 | Dual-direction combination-type papermaking enhancing process and device |
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