CN105256626B - A kind of mulberry skin chemi-mechanical pulp and preparation method thereof and purposes - Google Patents
A kind of mulberry skin chemi-mechanical pulp and preparation method thereof and purposes Download PDFInfo
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- CN105256626B CN105256626B CN201510708811.1A CN201510708811A CN105256626B CN 105256626 B CN105256626 B CN 105256626B CN 201510708811 A CN201510708811 A CN 201510708811A CN 105256626 B CN105256626 B CN 105256626B
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Abstract
A kind of mulberry skin chemi-mechanical pulp and preparation method thereof and purposes, belong to paper pulp and paper products technical field.Comprise the following steps：Sample prepares and once discongested；(2) picklings；(3) secondary pickling；(4) it is secondary to discongest；(5) once boiling；(6) it is secondary boiled；(7) pickling；(8) defibrination；(9) white picking；(10) chelation treatment；(11) acid treatment；(12) once bleach；(13) secondary bleaching；(14) mulberry skin chemi-mechanical pulp is obtained.Preparation method goes the efficiency high and effect of lignin and pectin good mulberry fibre removing.Meanwhile, the damage to mulberry fibre is smaller, and fiber has that whiteness is higher and mechanical property big and the preferable excellent comprehensive performance of fibrillating degree.
Description
Art
The present invention relates to a kind of mulberry root bark pulp and preparation method thereof, more particularly to a kind of mulberry skin chemi-mechanical pulp and making side
Method and purposes, belong to paper pulp and paper products technical field.
Background technology
Mulberry tree is deciduous tree or shrub.Mulberry skin is peeled from mulberry branch, and it is total that ramulus mori phloem fiber accounts for full bar
The 26%~30% of weight.Different from the bast of other wood types, mulberry skin has content of lignin low, the high spy of pectin content
Point.
The mulberry fibre extracted from mulberry skin is that a kind of toughness is strong, the natural green fiber of good mechanical performance, main to use
In weaving or pulping and paper-making.The fibers such as mulberry fibre and cotton, fiber crops carry out blending, can obtain that strength is high, wearability is good, hygroscopicity
The good yarn of good, easy dyeing, wrinkle resistance.Using mulberry fibre as raw material papermaking, obtained mulberry paper possesses solid and flexible, soft
Tender, insect prevention, the advantages of pulling force is strong, colour-fast, water absorbing force is strong, it is mainly used in the mounting of calligraphy and painting, wrapping bank note, umbrella processed, packaging, whip processed
In terms of big gun.In addition, being also used in the cultural Publishings such as print money, system fan, printing books.
The research of mulberry fibre focuses mostly in weaving at this stage, and technique relative maturity, the exploitation of Related product
In the exploitation of progress, especially mixed yarn without any confusion.And the research in terms of being used for pulping and paper-making is then less, technology is not
Enough maturations, the exploitation of Related product is even more few.
For mulberry fibre the research of pulping and paper-making and application less and immature technology the shortcomings of, the present invention with
Mulberry skin is raw material, and chemical pulping and mechanical feedback are combined, and gives full play to the respective advantage of chemistry and machinery, is removed
Lignin and pectin substance in mulberry skin raw material, isolate mulberry fibre, prepare mulberry skin chemi-mechanical pulp.The chemical machine of the mulberry skin of making
Tool is starched, and can be used for manufacture paper with pulp hand-made paper and machine-made paper, coordinates manufacture paper with pulp china picture-character paper, wrapping paper, cheque paper etc., application with other paper pulp
In packaging, ancient books painting and calligraphy print reproduction etc..
The content of the invention
The present invention provides a kind of preparation method and technique of mulberry skin chemi-mechanical pulp.The preparation method of the present invention is to change
Learn both method and machine methods effectively to combine, play the respective advantage of chemical action and mechanism and complement each other
Synergy, make mulberry skin chemi-mechanical pulp.
The manufacturing process steps of the mulberry skin chemi-mechanical pulp of the present invention are as follows：
(1) sample prepares and once discongested, and --- (2) picklings --- (3) secondary pickling --- (4) are secondary to dredge
Solution --- (5) once boiling --- (6) are secondary boiled --- (7) pickling --- (8) defibrination --- (9) white picking ---
(10) --- --- (12) once bleach --- (13) secondary bleaching ---, and (14) obtain Sang Pihua to chelation treatment for (11) acid treatment
Learn mechanical pulp.
(1) sample prepare and once discongest, by without scrape green grass or young crops dry mulberry skin, be cut into certain 3~5cm of length, width 2~
3cm, then soak time is once discongested after 4~10 weeks in defiberizing machine in running water.It is 1% to discongest concentration
~5%.
(2) picklings, the mulberry skin after step (1) processing is soaked in sulfuric acid solution, constantly rubbed while immersion,
To ensure the uniform of acid treatment, using the filter cloth bag originally water washing to pH to 7 of 40 mesh.
The condition of pickling processing is that sulfuric acid concentration 2g/L during pickling discongests mulberry skin absolute dry mass：Pickling reclaimed water
Mass ratio 1:15, temperature 70 C, time 6Omin, and rubbed once per 5min, normal pressure.
(3) secondary pickling, the mulberry skin solid after (2) picklings of step is soaked and constantly rubbed in sulfuric acid solution,
To ensure the uniform of acid treatment, then using the filter cloth bag originally water washing to pH to 7 of 40 mesh.
The condition of secondary pickling processing is, sulfuric acid concentration 2g/L, mulberry skin absolute dry mass after a pickling：Secondary pickling reclaimed water
Mass ratio 1:15, temperature 70 C, time 120min, and rubbed once per 5min, normal pressure.
(4) it is secondary to discongest, the mulberry skin solid after step (3) secondary pickling and filtering is dredged in defiberizing machine
Solution；Revolution is discongested for 20000~40000 turns, it is preferably 30000 turns preferably to discongest revolution.
(5) once boiling, by step (4) is secondary discongest after mulberry skin boiling is carried out in sodium hydroxide solution, after boiling,
Washed with running water, after washing, using the filter cloth bag originally water washing to pH to 7 of 40 mesh.
The process conditions of once boiling are, the concentration of sodium hydroxide solution is 5g/L~20g/L, normal pressure, 100 DEG C of temperature,
Liquor ratio (it is secondary discongest after mulberry skin absolute dry mass：The quality of sodium hydroxide solution reclaimed water) it is 1:20,2~10h of time.
It is preferred that process conditions be that the concentration of sodium hydroxide solution is 15g/L, and the time is 6h.Under preferred processing condition,
The yield that gained is slightly starched is 37.8%, the Kappa number of paper pulp is 20.8, and the residual gum content of paper pulp is 7.19%.
(6) it is secondary boiled, gained solids crude slurry after step (5) once boiling is subjected to secondary steaming in sodium hydroxide solution
Boil, and add tertiary sodium phosphate, ammonium oxalate；After secondary boiled, washed with running water, after washing, using the filter cloth bag of 40 mesh
With originally water washing to pH to 7.
Secondary boiled process conditions are that the concentration of sodium hydroxide solution is 10g/L~20g/L, and tertiary sodium phosphate consumption is
Once boiling and filter gained solids crude slurry 1%~7%, ammonium oxalate be 1g/L~3g/L, normal pressure, 100 DEG C of temperature, liquor ratio
(once boiling simultaneously filters gained solids crude slurry absolute dry mass：The quality of sodium hydroxide solution reclaimed water) it is 1:15,1~3h of time.
It is preferred that process conditions be that the concentration of sodium hydroxide solution is 15g/L, tertiary sodium phosphate consumption is 3%, and ammonium oxalate is used
Measure as 2g/L, liquor ratio is 1:15, temperature is 100 DEG C, and pressure is normal pressure, and digestion time is 1.5h.
Under preferred processing condition, the yield that gained is slightly starched is 94.33%, and the Kappa number of paper pulp is 16.0, paper pulp it is residual
Glue rate is 3.04%.
Compared with once boiling, after secondary boiled, Kappa number, the residual gum content of paper pulp reduce further.
(7) pickling, pickling is carried out by paper pulp of the step (6) after secondary boiled；Acid washing conditions are that sulfuric acid concentration is 2g/
L, liquor ratio (the paper pulp absolute dry mass after secondary boiled and filtering：The quality of sulfuric acid reclaimed water) it is 1：20, normal temperature and pressure washing 5min；
After pickling, using the filter cloth bag originally water washing to pH to 7 of 40 mesh.
(8) defibrination, defibrination process is carried out by the mulberry skin after (7) pickling of step.After defibrination terminates, using 260 purposes
Filter cloth bag is by pulp concentrating and washing.
Refining process condition is that defibrination mass concentration is 1.0%~5.0%, and refining pressure is 0.25MPa, defibrination time
For 20min~60min.
It is preferred that refining process condition be that refining concentration is 1.5%, the defibrination time be 40min.The beating degree of gained paper pulp
For 31 ° of SR.
Under the conditions of preferred defibrination, gained paper pulp is copied into paper.The tightness of paper is 0.23 μm, and tensile index is
33.6N.m/g, tear index is 600mN.m2/ g, whiteness is 44.5%, and the L values of color are that 79.6, a* is that 1.83, b* is
13.19。
(9) white picking, pickling is carried out by the paper pulp after step (8) defibrination and washing.Acid washing conditions are that sulfuric acid concentration is
2g/L, liquor ratio (step (8) defibrination and wash after paper pulp absolute dry mass：The quality of sulfuric acid reclaimed water) it is 1：20, normal temperature and pressure washing
5min.After pickling terminates, paper pulp is washed till to 7 by pH with running water using the filter cloth bag of 260 mesh.
(10) chelation treatment, chelation treatment is carried out with chelating agent to the paper pulp after step (9) white picking.Chelating agent is
DPTA, DPTA mass consumption are 0.2% of the absolute dried paper pulp after white picking, and the temperature of chelation treatment is 90 DEG C, and the time is
60min, it is ensured that chelatropic reaction is uniform.After chelation treatment, in the filter cloth bag of 260 mesh with running water by pulp washing to pH be 7.
(11) acid treatment, acid treatment is carried out by the paper pulp after step (10) chelation treatment；Handled using sulfuric acid, sulfuric acid
Mass percent concentration is 2%, and the temperature of processing is 70 DEG C, and the time is 40min, it is ensured that the uniformity of acid treatment.After acid treatment,
In (260 purpose) filter cloth bag with running water by pulp washing to pH be 7.
(12) bleach, the paper pulp after step (11) acid treatment is bleached, first, paper pulp is located in advance with sodium metasilicate
Reason, the preferably consumption of sodium metasilicate are 3% of the paper pulp absolute dry mass after acid treatment；Then, with hydrogen peroxide bleaching and hydrogen-oxygen
Change sodium to bleach paper pulp, the consumption of hydrogen peroxide is 2.0%~4.0% of the paper pulp absolute dry mass after acid treatment, hydrogen-oxygen
Changing sodium is used to adjust pH value to be 9~11.After bleaching, in (260 purpose) filter cloth bag with running water by pulp washing to pH be 7.
Bleaching method is divided into once two kinds of bleaching and bleaching in stages.Compared with a bleaching method, although bleaching agent it is total
Consumption is identical, but when being due to bleaching in stages, and the concentration of every section of bleaching agent and the concentration of sodium hydroxide are right all than relatively low
The destruction of paper pulp is small, and the whiteness of paper pulp is higher.Accordingly, it is preferred that bleaching method is bleaching in stages, and peroxidating
Total consumption of hydrogen is 3.0%.
During using bleaching in stages, the process conditions of every section of bleaching are identical, help to simplify whitening procedure, do not reduce paper pulp
Quality.Therefore, the process conditions of every section of bleaching are to starch dense 6%, hydrogen peroxide use 1.0%~2.0%, 95 DEG C of temperature, time
10~20min.
Preferably be that it is 6% to starch dense per sectional bleaching process condition, temperature is 95 DEG C, first paragraph bleaching time be 15min and
Hydrogen peroxide use is 1.5%.
Under optimum condition, the whiteness of gained paper pulp is 78%, and the L values of color are that 95.43, a* is that 0.27, b* is 4.15.
The effect of several processing and purpose are respectively：
1st, sample prepares and once discongested to be mulberry skin raw material to be cut into certain length, and the method for using machinery, favorably
In the crust for getting rid of mulberry skin raw material, mulberry fibre raw material mix becomes than more loose, make mulberry fibre raw material be adapted to pickling and
The need for boiling, to obtain relatively good thick slurry.
2nd, the purpose of pickling processing is to remove the crust of the mulberry fibre raw material of open structure.The pickling side that can be used
Formula once pickling and gradation pickling.Gradation pickling handle, help to remove more crusts, to subsequent boiling more added with
Profit, improves cooking effect.
3rd, secondary discongest is, further by the mechanism of defiberizing machine, to make the structure of mulberry fibre raw material more
Loose, when being conducive to subsequent boiling, diffusion of the boiling reagent in mulberry fibre raw material, improves lignin and chemistry occurs for pectin
Reaction, is conducive to removing lignin and pectin.
4th, the effect of boiling is, by structure than more loose mulberry fibre raw material under the chemical action of boiling reagent, with
Lignin and pectin are chemically reacted, and get rid of the connection between lignin and pectin, destruction mulberry fibre, and further destroy
The epidermis of mulberry skin, obtains thick mulberry root bark pulp.At this moment mulberry root bark pulp containing part lignin and pectin due also to keep mulberry fibre
Certain contact, but the contact between mulberry fibre has compared weak.The work of this step Major Basic chemical reagent
With so being chemical method.The mode of boiling is divided into once boiling and multiple boiling.Contributed to using multiple boiling in reductionization
While reagent is learned to the destruction of fiber, fiber can be preferably separated.
5th, defibrination is, by thick mulberry root bark pulp, further to be handled using mechanical system.Effect of the thick mulberry root bark pulp in mechanical force
Under, by the effect of tear, conquassation, friction etc., reach the purpose further separated.This step is mainly mechanism.
Mechanism causes mulberry fibre to be separated, and the contact between mulberry fibre further weakens in the effect of mechanical force, obtains
To mulberry root bark pulp mulberry fibre have certain longitudinal wire-dividing broom purification and horizontal fracture.By this mechanical treatment, what is obtained is
Thin mulberry root bark pulp.
6th, pickling twice is arranged in the front and rear of defibrination respectively, and can be removed the crust of mulberry fibre by pickling must compare
Totally.
7th, bleaching uses hydrogen peroxide bleaching, is divided into once bleaching and bleaching in stages.Carried out using hydrogen peroxide
, it is necessary to be handled using acid treatment and chelating agent, heavy-metal ion removal before bleaching, eliminate heavy metal ion and hydrogen peroxide is floated
White influence.Using hydrogen peroxide further to thin mulberry root bark pulp carry out bleaching, paper pulp by hydrogen peroxide oxidation,
Further the lignin and pectin of remaining are fallen in removing, obtain mulberry skin chemi-mechanical pulp.
Present invention also offers the process conditions of mulberry skin chemi-mechanical pulp and its preferred processing condition.It is well known that chemical
The process conditions of effect and mechanism produce conclusive effect to the property of final paper pulp.
Chemical treatment includes digestion process and bleaching.The process conditions of boiling and the process conditions of bleaching decide
The degree of lignin and pectin is removed, the performance of paper pulp is influenceed.
Mechanical treatment includes discongesting processing and defibrination process.Discongesting makes mulberry skin raw material mix loose, in order to boiling reagent
Easily permeated with bleaching agent, be easy to removal of the reagent to lignin and pectin.Defibrination is the effect using mechanical force, is passed through
The physical action of tear, conquassation, friction etc., makes further fiber separation come, and occurs the fibrillatings such as longitudinal wire-dividing broom purification
With surface area and expose more hydroxyls, be favorably improved fiber into the adhesion between fiber during paper, improve paper
Performance.
The purposes for the mulberry skin chemi-mechanical pulp that the present invention makes is manufactured paper with pulp mulberry paper using ancient method copy paper mode, as painting and calligraphy
Paper, is used as the carrier of the duplication of ancient books painting and calligraphy.Mulberry root bark pulp can also be with other paper pulp, such as dragon straw pulp, reed pulp, bamboo pulp, straw
Slurry, wood pulp etc. for collotype printing, silk-screen printing, ink jet printing, the mode of printing such as stencil and carry out printing text with plagiarizing a book drawing paper
Change the creation of the art work.Mulberry root bark pulp can be also used for the repair process of damaged historical relic ancient books.
The invention has the advantages that, preparation method removes the efficiency high and effect for removing lignin and pectin to mulberry fibre
It is really good.Meanwhile, the damage to mulberry fibre is smaller, fiber have that whiteness is higher and mechanical property big and fibrillating degree compared with
Good excellent comprehensive performance.Such as, the fibrillating degree of mulberry fibre is higher, then the pulling force into paper is big and folding number more than etc.
Excellent mechanical property.The whiteness of mulberry paper slurry is higher, then the whiteness into paper is higher, less dirt count.The boiling examination of use
Agent hydrogen peroxide and other chemical levels are less, and processing is gentle, and carrying capacity of environment is smaller.The bleaching agent of use is peroxidating
Hydrogen, is environment-friendly type bleaching agent, belongs to Green Chemistry, non-environmental-pollution.Therefore, preparation method of the invention, meets Modern Green
The requirement of environmental protection.The mulberry skin chemi-mechanical pulp of the present invention has many extensive uses.
Embodiment
By specific examples below, the invention will be further described.Following specific descriptions are for the ease of understanding sheet
Invention, is not for limiting the scope of the invention.
Its manufacturing process steps of mulberry skin chemi-mechanical pulp of the present invention are:
(1) sample prepares and once discongested, and --- (2) picklings --- (3) secondary pickling --- (4) are secondary to dredge
Solution --- (5) once boiling --- (6) are secondary boiled --- (7) pickling --- (8) defibrination --- (9) white picking ---
(10) --- --- (12) once bleach --- (13) secondary bleaching ---, and (14) obtain Sang Pihua to chelation treatment for (11) acid treatment
Learn mechanical pulp.
The purpose of manufacturing process steps and effect：
1st, sample prepares.Mulberry skin (without blue or green processing is scraped) is peeled from branch to air-dry through exposure in sunshine, and 3 are cut into fruittree shear
2~3cm of~5cm length and widths sample is standby.Then said sample is soaked in the running water of normal temperature 6 weeks, taken out through 4~8 times
Cleaning, the pectin analyzed in the middle part of mulberry skin is cleaned.3~5cm length and widths, 2~3cm sample can both ensure that mulberry skin was smooth
Degumming, does not interfere with the performance of prepared slurry again.The part pectin that soaking can make in mulberry skin for 6 weeks is precipitate into water, so that
Connect the efficiency of lifting boiling degumming.
2nd, discongest.Discongesting before boiling is to increase the surface area of mulberry skin, cooking liquor is penetrated into every bundle fiber
Between go, so as to improve the efficiency of boiling degumming.Discongesting after bleaching, is prepared for copy paper so that what fiber can be evenly
It is dispersed in water.
3rd, pickling.Pickling processing is carried out before boiling degumming can remove part pectin and lignin, and next makes wherein another
Some hydrolyzed pectins not removed can also be most exocuticle into the relatively low material of molecular weight, the pretreatment of last pickling
Separated with bast, soda boiling degumming, the efficiency of peeling are improved indirectly.It should be noted that when the excessive concentration of pickling, can also
Bring cellulolytic side effect, therefore it is noted that the concentration of control pickling.
4th, wash.It will be cleaned after pickling, boiling, bleaching, pickling with water, effect is that the sample of acid-forming base is returned back to
Neutrality, cleans all first cleaned one time with 50 DEG C of warm water every time, then rub side with originally waterside and clean 3~5 times.Pickling, boiling
Completed when cleaning afterwards in the sack that the filter cloth that mesh is 40 is made, in the filter cloth system that mesh is 260 when being cleaned after pickling, bleaching
Into sack in complete, the purpose cleaned with filter cloth be cleaning while take away the impurity such as tiny exocuticle, dust.Diacid
Wash, bleach after the filter cloth mesh number selected it is different from the former, then be because fiber shortens and attenuated after mashing, if again with the net of 240 mesh
Mesh is cleaned, then fiber can be lost in between mesh.Washing lotion is measured with pH test paper during cleaning, to filtrate pH value be 7 when
Complete cleaning.Removal of impurities is carried out to script material during cleaning wherein after first time boiling, picked out larger to be gone by alkali lye
Bifurcated, the impurity of location of necrosis removed.
5th, boiling.Boiling can remove remaining most of pectin and lignin in mulberry skin, fiber is become more soft, more
Carefully.The present invention is carried out by the way of secondary boiled, and first time boiling can slough most of pectin and lignin, second of boiling
When add digesting assistant pectin and lignin are further deviate from.
6th, defibrination.The degumming in mulberry skin by boiling is largely removed, but is also sticked on a small quantity between fiber, it is impossible to
Removed by way of boiling, so remaining pectin and outer flaw-piece are removed in the way of mechanical jordaning.Meanwhile, cutting
In the presence of shear force, the length and fineness of fiber all make moderate progress, and the progress for being conducive to next step to bleach.
7th, pickling.Pickling can neutralize the residual alkali adhered to after mashing on fiber and reach neutrality, while in removable fibrous
The coloring matter of absorption.
8th, bleach.The present invention is using the method for two-part hydrogen peroxide bleaching, and the purpose of bleaching is to remove to influence fiber white
The coloring matter of degree and optical property.In bleaching agent hydrogen peroxide use under the same conditions, the number of times of increase bleaching can make
The whiteness of fiber has been lifted.
In the technical process of the present invention, the consumption of chemical reagent is smaller, causes environmental pollution smaller, energy consumption and water consume compared with
It is small.
Embodiment 1
The manufacturing process steps of mulberry skin chemi-mechanical pulp are:
(1) sample prepares and once discongested, and --- (2) picklings --- (3) secondary pickling --- (4) are secondary to dredge
Solution --- (5) once boiling --- (6) are secondary boiled --- (7) pickling --- (8) defibrination --- (9) white picking ---
(10) --- --- (12) once bleach --- (13) secondary bleaching ---, and (14) obtain Sang Pihua to chelation treatment for (11) acid treatment
Learn mechanical pulp.
The technological process of mulberry skin chemi-mechanical pulp is：
(1) sample prepares and once discongested.After the mulberry skin peeled from ramulus mori is dried, be cut into 3~5cm length and widths 1~
2cm mulberry leather strap, is soaked 6 weeks with running water.Then, the mulberry skin after immersion is put into defiberizing machine and discongested.Discongest
Concentration is 2.5%, discongests 30000 turns of revolution.
(2) picklings.Liquor ratio is 1:15, sulfuric acid concentration is 2g/L, and temperature is 70 DEG C, time 6Omin, and is rubbed per 5min
Rub with the hands once, normal pressure.
(3) secondary pickling.Liquor ratio is 1:15, sulfuric acid concentration is 2g/L, and temperature is 70 DEG C, time 120min, and per 5min
Rub once, normal pressure.
(4) it is secondary to discongest.It is 2.5% to discongest concentration, discongests revolution for 30000 turns.
(5) once boiling.The concentration of sodium hydroxide solution is 15g/L, liquor ratio (absolute dried paper pulp quality：The quality of water) it is 1:
20, boiling temperature is 100 DEG C, and pressure is normal pressure, and the time is 6h.Under preferred processing condition, the yield that gained is slightly starched is
37.8%, the Kappa number of paper pulp is 20.8, and the residual gum content of paper pulp is 7.19%.
(6) it is secondary boiled.The concentration of sodium hydroxide solution is 15g/L, and 3% tertiary sodium phosphate consumption is 3%, and ammonium oxalate is
2g/L liquor ratios are 1:15, temperature is 100 DEG C, and pressure is normal pressure, and digestion time is 1.5h.Under preferred processing condition, gained is thick
The yield of slurry is 94.33%, and the Kappa number of paper pulp is 16.0, and the residual gum content of paper pulp is 3.04%.
(7) pickling.Sulfuric acid concentration is 2g/L, and liquor ratio is 1：20, normal temperature and pressure washing 5min.
(8) defibrination.Refining concentration is 1.5%, and refining pressure is 0.25MPa, and the defibrination time is 40min.Gained paper pulp
Beating degree is 31 ° of SR.
Under the conditions of preferred defibrination, gained paper pulp is copied into paper.The tightness of paper is 0.23 μm, and tensile index is
33.6N.m/g, tear index is 600mN.m2/ g, whiteness is 44.5%, and the L values of color are that 79.6, a* is that 1.83, b* is
13.19。
(9) white picking.Sulfuric acid concentration is 2g/L, and liquor ratio is 1：20, normal temperature and pressure washing 5min.
(10) chelation treatment.Chelating agent is DPTA, and DPTA mass consumptions are 0.2%, and the temperature of chelation treatment is 90 DEG C, when
Between be 60min.
(11) acid treatment.Sulfuric acid concentration is 2%, and the temperature of processing is 70 DEG C, and the time is 40min.
(12) bleach.Using two sections of bleaching methods, it is, it is 6% to starch dense that temperature is 95 DEG C per sectional bleaching process condition, the
One section of bleaching time is 15min and hydrogen peroxide use is 1.5%.
The whiteness of gained paper pulp is 78%, and the L values of color are that 95.43, a* is that 0.27, b* is 4.15,39 ° of SR of beating degree.
By obtained mulberry skin chemi-mechanical pulp under above-mentioned processing step and process conditions, paper is manufactured paper with pulp into, and to mulberry paper
Performance is tested.
By the mulberry skin chemi-mechanical pulp prepared, suspension is configured to 0.5% concentration, with 30g/m2、45g/m2、
60g/m2、75g/m2、90g/m2Quantitative handsheet is carried out on handsheet machine.Determine the mechanical property and optical property such as table 1 of paper
It is shown.
The quantitative influence to mulberry paper performance of table 1
With quantitative increase, the tightness of paper, whiteness, ageing-resistant brightness (absolute value) decline, suction range, flexible
The performance changes such as rate, tightness, dirt count, moisture are little.The whiteness of paper depends primarily on the whiteness of paper pulp used.Because used
Be same bleaching mulberry root bark pulp, so the whiteness of paper is more or less the same.It is before and after representing paper aging that ageing-resistant brightness, which declines,
As the reason for index of whiteness change, the reason for changing little and little Paper White Degree change.
The dirt count measurement of paper is the macroscopic spot for having significant difference with paper color of paper surface, with
The spot of paper surface is relevant.Dust thing in same paper pulp is uniformly dispersed in paper pulp.Quantitative big paper sheet thickness
Greatly, although dust thing quantity is relative to be increased, but has many impurity to be covered by surface fiber, and paper surface is not dispersed in, is caused
Dirt count is more or less the same.
Hemicellulose level that expansion and contraction is depended primarily in paper pulp, beating degree height and the factor such as it is glued, is filled with.Due to
Mulberry root bark pulp used is same, and is not filled with, is glued, therefore expansion and contraction change is little.Suction range depends primarily on fiber
The structure of property, the beating degree of paper pulp and paper, therefore also change little.Quantification of 30g/m2The tensile index of mulberry paper, tear
Du Bigao quantifies the low of mulberry paper.Because when quantitative too low, mulberry paper evenness is poor to be caused.
Embodiment 2
Matched somebody with somebody using the mulberry skin oar of the gained of embodiment 1 with other paper pulp and copied, paper of manufacturing paper with pulp.
1st, mulberry skin chemi-mechanical pulp and lincaraboard paper
Mulberry skin chemi-mechanical pulp prepared by embodiment 1 is mixed from Straw Pulp according to different percentage compositions, with 30g/m2's
It is quantitative that handsheet is carried out on handsheet machine, measure paper performance.
The conceptual design of the mulberry skin chemi-mechanical pulp of table 2 and lincaraboard paper
| Sequence number | Mulberry root bark pulp (%) | Straw Pulp (%) |
| 1 | 60 | 40 |
| 2 | 70 | 30 |
| 3 | 80 | 20 |
| 4 | 90 | 10 |
| 5 | 100 | 0 |
The performance of the mulberry skin chemi-mechanical pulp of table 3 and lincaraboard paper
As shown in Table 3, with the raising of Straw Pulp ratio, the whiteness with copy paper is gradually reduced.Because Straw Pulp
Whiteness is lower than mulberry skin chemi-mechanical pulp, and with the lifting of Straw Pulp ratio, the whiteness with copy paper has been lifted naturally.Tightness side
Face, 4 groups of difference for adding Straw Pulp are little；Wheat straw fiber group is not added with significantly lower than addition group.Because wheat straw fiber it is thin,
It is short, the gap between mulberry fibre can be interspersed in copy paper, therefore paper seems closely knit.
With the increase of Straw Pulp ratio, tensile index first increases and reduced afterwards.Because mulberry skin chemi-mechanical pulp is to paper
Zhang Qiangdu plays backbone's, and Straw Pulp is filled between mulberry fibre, plays bonding and enhanced effect.Straw Pulp ratio is reached
After more than 30%, the mulberry root bark pulp content reduction being a mainstay to intensity causes the intensity decreases of paper.Tearability is with wheat straw
Starch the increase of content and reduce.Because tearability increases with the increase of fibre length, Straw Pulp fibre length compares mulberry
Hide fiber is short, and the ratio of increase Straw Pulp causes the average length with papermaking to reduce, so as to reduce the tearability of paper.Due to
The ageing-resistant performance of wheat straw pulp fibres is not so good as mulberry skin chemical machinery pulp fibres, therefore lifting Straw Pulp makes under ageing-resistant brightness than regular meeting
Depreciation increase.
With the rise of Straw Pulp ratio, suction range slightly has reduction, because the water imbibition of wheat straw fiber is than mulberry skin
Fiber is poor.With the lifting of Straw Pulp ratio, the expansion and contraction of paper slightly has lifting.Because expansion and contraction is by hemicellulose level
With the influence of beating degree.The beating degree and hemicellulose level of Straw Pulp are slightly above mulberry root bark pulp.Dirt count can contain with Straw Pulp
The lifting of amount and increase, be because Straw Pulp contained by impurity be more than mulberry root bark pulp.Using mechanical property as main evaluation index, with reference to
Other performances, comprehensive analysis thinks that sequence number 4, i.e. mulberry skin chemi-mechanical pulp content are to match somebody with somebody to copy when 90%, Straw Pulp content is 10%
The properties of paper are relatively best.
2nd, mulberry skin chemi-mechanical pulp and softwood pulp are with copy paper
Mulberry skin chemi-mechanical pulp prepared by embodiment 1 is mixed from softwood pulp according to different percentage compositions, with 30g/m2
It is quantitative handsheet is carried out on handsheet machine, determine paper performance.
The mulberry skin chemi-mechanical pulp of table 4 matches somebody with somebody the conceptual design of copy paper with softwood pulp
The mulberry skin chemi-mechanical pulp of table 5 matches somebody with somebody the performance of copy paper with softwood pulp
As shown in Table 5, with the raising of softwood pulp ratio, the whiteness with copy paper has been lifted, the tightness change of paper
Less.Because the whiteness of softwood pulp is higher than mulberry skin chemi-mechanical pulp, with the lifting of softwood pulp ratio, with copy paper
Whiteness lifted naturally.
With the increase of softwood pulp ratio, tensile index increase is increased slightly.Because mulberry skin chemi-mechanical pulp with
Softwood pulp interts mutually, plays enhanced effect.But it is this to increase because mulberry fibre and needle-leaved wood fibre are all relatively wide, long
Pretend with unobvious.Tearability increases with the increase of softwood pulp content.Because tearability is with fibre length
Increase and increase, needle-leaved wood fibre length is more than mulberry fibre length, and the ratio of increase softwood pulp causes flat with papermaking
Equal length increase, so as to improve the tearability of paper.
Because the ageing-resistant performance of softwood pulp fiber is similar to mulberry skin chemical machinery pulp fibres, therefore ageing-resistant brightness declines
Value changes are little.With the lifting of softwood pulp ratio, suction range slightly has lifting.Reason is that the beating degree of softwood pulp is
19 ° of SR are less than 39 ° of SR of mulberry skin chemi-mechanical pulp.With the lifting of softwood pulp ratio, the expansion and contraction of paper is declined slightly.This
It is that softwood pulp beating degree is less than mulberry root bark pulp because expansion and contraction is influenceed by beating degree.Dirt count can be with softwood pulp content
Lifting and reduce, be because softwood pulp impurities be less than mulberry root bark pulp.Using mechanical property as main evaluation index, with reference to it
His performance, comprehensive analysis thinks that sequence number 8, i.e. mulberry skin chemi-mechanical pulp content are with copying when 80%, softwood pulp content is 20%
The properties of paper are relatively best.Compare mulberry skin chemi-mechanical pulp with Straw Pulp, softwood pulp with copy paper, mulberry skin chemical machinery
Tensile index, dirt count, the expansion and contraction of slurry and lincaraboard paper match somebody with somebody copy paper Zhang Yaogao than mulberry root bark pulp and softwood pulp, and tear
It is low that degree of splitting, suction range, whiteness match somebody with somebody the paper copied than mulberry root bark pulp and softwood pulp.
3rd, mulberry skin chemi-mechanical pulp and Straw Pulp and softwood pulp are with copy paper
Mulberry skin chemi-mechanical pulp prepared by embodiment 1 is mixed from Straw Pulp and softwood pulp according to different percentage compositions,
With 30g/m2It is quantitative that handsheet is carried out on handsheet machine, determine paper performance.
The mulberry skin chemi-mechanical pulp of table 6 starches the conceptual design with copy paper with Straw Pulp softwood pulp
The mulberry skin chemi-mechanical pulp of table 7 matches somebody with somebody the performance of copy paper with Straw Pulp and softwood pulp
As shown in Table 7, when softwood pulp content is high, the whiteness with copy paper is higher.When Straw Pulp content is high, tensile index compared with
It is high.Tearability increases with the increase of fibre length, increases so that with the increase of softwood pulp content.Suction range with
The increase of beating degree and reduce, expansion and contraction is raised with the rise of beating degree.
Dirt count is reduced with the increase of softwood pulp content, because Straw Pulp impurity content ＞ mulberry root bark pulp ＞ needlebush
Slurry.With the lifting of mulberry root bark pulp constant concentration, each performance change scope is gradually reduced.Using mechanical property as main evaluation index,
With reference to other performances, comprehensive analysis thinks that sequence number 14, i.e. mulberry root bark pulp content are that 70%, Straw Pulp content is 10%, softwood pulp
The properties with copy paper are relatively best when content is 20%.
Embodiment 3
First, mulberry skin chemi-mechanical pulp prepared by embodiment 1 is manufactured paper with pulp mulberry paper；Then, by mulberry skin chemi-mechanical pulp with
Straw Pulp, softwood pulp (mulberry skin chemi-mechanical pulp content is that 70%, Straw Pulp content is that 10%, softwood pulp content is 20%)
With copy paper；It is compared by mulberry paper, with copying mulberry paper with commercially available paper performance.
The mulberry paper of table 8, with the performance comparison for copying mulberry paper and commercially available rice paper
As shown in Table 8, with copying mulberry paper and commercially available rice paper properties are all more or less the same, and china picture-character paper industry mark is met
Accurate requirement.More bigger than commercially available rice paper with the dirt count for copying mulberry paper, tensile index, tearability are apparently higher than commercially available rice paper.
With the function admirable for copying mulberry paper, but dirt count need to further improve.
Embodiment 4
Three kinds of paper in embodiment 3 are printed.
The raw material of table 9 and printing equipment
Technological process：With ink → printing
1st, with ink
It is water-based ink due to stenciling ink used, the ink of various concentrations is controlled by the addition of deionized water.
2nd, print
The ink prepared is put into disc, uniformly beats on version, then puts down the paper got ready after being picked with ink brush
It is layered on above version, finally brushes one times the paper back of the body in the horizontal direction with bristle brush, take paper off, picture and text have been transferred to above paper, extremely
This, which is completed, entirely stencils flow.
The concentration of ink influences ink in the diffusion velocity of paper surface, the definition of printed matter and stereovision.Mass colour for
The printing effect influence of the different pieces such as picture, word is had nothing in common with each other.When black concentration is low, the radius that ink spreads in paper surface
Greatly, now halation effect is good, but printing precision and definition are low.When black moderate concentration, the precision and definition of printed matter
Preferably, in printed matter word is clear, picture stereovision is good.When black excessive concentration, the pressure stenciled is smaller, cause ink without
Method is all transferred on paper from version, and printed matter is unintelligible, no stereovision, and the ink at word is substantially lacked.
Be used for the printing effect stenciled preferably with mulberry paper is copied, to commercially available rice paper to stencil effect similar, either clearly
Degree or stereovision are all relatively good.For printing effect, mulberry paper is better than with mulberry paper is copied.
The mulberry skin chemi-mechanical pulp of the present invention can match somebody with somebody copy paper with other paper pulp in addition to Straw Pulp, softwood pulp
.
The mulberry skin chemi-mechanical pulp of the present invention and the paper comprising it, can be using the various printing sides in addition to stenciling
Formula, can also adapt to the printing of multiple inks.
Usefulness of the present invention, mulberry skin chemi-mechanical pulp of the invention can be using method of manufacturing paper with pulp by hand, machinery paper processed
The methods such as method, dry method of paper-making method are molded, the purposes such as gained paper products have painting and calligraphy, packaging, printing, false proof, Gu Pin imitated.
Those skilled in the art should be understood that above-described embodiment is simply illustrated to this patent, composition pair
The limitation of this patent.Can make improvements, combine as needed, sub-combination and conversion, it is all improvement, combination, sub-
Combination, conversion and equivalence replacement, are all included within the scope of the appended claims.
Claims (7)
1. a kind of preparation method of mulberry skin chemi-mechanical pulp, it is characterised in that comprise the following steps：
(1) sample prepares and once discongested；(2) picklings；(3) secondary pickling；(4) it is secondary to discongest；(5) once boiling；(6)
It is secondary boiled；(7) pickling；(8) defibrination；(9) white picking；(10) chelation treatment；(11) acid treatment；(12) bleach；
(13) mulberry skin chemi-mechanical pulp is obtained；
It is specific as follows：
(1) sample prepares and once discongested, and by the dry mulberry skin without scraping green grass or young crops, 3~5cm of length, 2~3cm of width is cut into, originally
Then soak time is once discongested after 4~10 weeks in defiberizing machine in water；
(2) picklings, the mulberry skin after step (1) processing is soaked in sulfuric acid solution, constantly rubbed while immersion, to protect
The uniform of acid treatment is demonstrate,proved, using the filter cloth bag originally water washing to pH to 7 of 40 mesh；
(3) secondary pickling, the mulberry skin solid after (2) picklings of step is soaked and constantly rubbed in sulfuric acid solution, to protect
The uniform of acid treatment is demonstrate,proved, then using the filter cloth bag originally water washing to pH to 7 of 40 mesh；
(4) it is secondary to discongest, the mulberry skin solid after step (3) secondary pickling and filtering is discongested in defiberizing machine；
(5) once boiling, by step (4) is secondary discongest after mulberry skin boiling is carried out in sodium hydroxide solution, after boiling, with from
Water is washed, after washing, using filter cloth bag originally water washing to pH to 7；
(6) it is secondary boiled, by after step (5) once boiling gained solids crude slurry carried out in sodium hydroxide solution it is secondary boiled,
And add tertiary sodium phosphate, ammonium oxalate；After secondary boiled, washed with running water, after washing, using filter cloth bag with originally washing
Wash to pH to 7；
(7) pickling, pickling is carried out by paper pulp of the step (6) after secondary boiled；Acid washing conditions are that sulfuric acid concentration is 2g/L, liquid
Than for 1：20, normal temperature and pressure washing 5min；After pickling, using the filter cloth bag originally water washing to pH to 7 of 40 mesh；
(8) defibrination, defibrination process is carried out by the mulberry skin after (7) pickling of step, after defibrination terminates, using filter cloth bag by paper pulp
Concentration and washing；
(9) white picking, pickling is carried out by the paper pulp after step (8) defibrination and washing, and acid washing conditions are that sulfuric acid concentration is 2g/L,
Liquor ratio is 1：20, normal temperature and pressure washing 5min；After pickling terminates, paper pulp is washed till to 7 by pH with running water using filter cloth bag；
(10) chelation treatment, chelation treatment is carried out with chelating agent to the paper pulp after step (9) white picking；Chelating agent is DPTA,
Ensure that chelatropic reaction is uniform；After chelation treatment, in filter cloth bag with running water by pulp washing to pH be 7；
(11) acid treatment, acid treatment is carried out by the paper pulp after step (10) chelation treatment；Handled using sulfuric acid, acid treatment
Afterwards, in filter cloth bag with running water by pulp washing to pH be 7；
(12) bleach, the paper pulp after step (11) acid treatment is bleached, first, paper pulp is pre-processed with sodium metasilicate；So
Afterwards, paper pulp is bleached with hydrogen peroxide bleaching and sodium hydroxide, the consumption of hydrogen peroxide is exhausted for the paper pulp after acid treatment
The 2.0%~4.0% of dry mass, sodium hydroxide is used to adjust pH value to be 9~11；After bleaching, with running water by paper in filter cloth bag
Plasm scouring to pH be 7；
The condition of (2) picklings of step processing is that sulfuric acid concentration 2g/L during pickling discongests mulberry skin absolute dry mass：Pickling
The mass ratio 1 of reclaimed water:15, temperature 70 C, time 60min, and rubbed once per 5min, normal pressure；
The condition of step (3) secondary pickling processing is, sulfuric acid concentration 2g/L, mulberry skin absolute dry mass after a pickling：Secondary pickling
The mass ratio 1 of reclaimed water:15, temperature 70 C, time 120min, and rubbed once per 5min, normal pressure；
The process conditions of step (5) once boiling are that the concentration of sodium hydroxide solution is 5g/L~20g/L, normal pressure, temperature 100
DEG C, liquor ratio is 1:20,2~10h of time；
The secondary boiled process conditions of step (6) are that the concentration of sodium hydroxide solution is 10g/L~20g/L, tertiary sodium phosphate consumption
For once boiling and filter gained solids crude slurry 1%~7%, ammonium oxalate be 1g/L~3g/L, normal pressure, 100 DEG C of temperature, liquor ratio
For 1:15,1~3h of time；
Step (8) refining process condition is that defibrination mass concentration is 1.0%~5.0%, and refining pressure is 0.25MPa, during defibrination
Between be 20min~60min；
Step (10) chelating agent is DPTA, and DPTA mass consumptions are 0.2% of the absolute dried paper pulp after white picking, chelation treatment
Temperature is 90 DEG C, and the time is 60min, it is ensured that chelatropic reaction is uniform；
Step (11) sulfuric acid mass percent concentration is 2%, and the temperature of processing is 70 DEG C, and the time is 40min, it is ensured that acid treatment
Uniformity；
The consumption of step (12) sodium metasilicate is 3% of the paper pulp absolute dry mass after acid treatment.
2. preparation method according to claim 1, it is characterised in that step (12) bleaching method, which is divided into, once to be bleached and divide
Two kinds of section bleaching；During using bleaching in stages, the process conditions of every section of bleaching are identical, help to simplify whitening procedure, do not reduce
Pulp quality, therefore, every section bleaching process conditions be, slurry dense 6%, hydrogen peroxide use 1.0~2.0%, 95 DEG C of temperature, when
Between 10~20min.
3. preparation method according to claim 2, it is characterised in that be per sectional bleaching process condition, it is 6% to starch dense, temperature
Spend for 95 DEG C, first paragraph bleaching time is 15min and hydrogen peroxide use is 1.5%.
4. preparation method according to claim 2, it is characterised in that the concentration of step (5) sodium hydroxide solution is 15g/
L, the time is 6h.
5. preparation method according to claim 2, it is characterised in that the concentration of step (6) sodium hydroxide solution is 15g/
L, tertiary sodium phosphate consumption is 3%, and ammonium oxalate consumption is 2g/L, and liquor ratio is 1:15, temperature is 100 DEG C, and pressure is normal pressure, during boiling
Between be 1.5h.
6. the mulberry skin chemi-mechanical pulp that the either method in claim 1-5 is prepared.
7. the purposes for the mulberry skin chemi-mechanical pulp that the either method in claim 1-5 is prepared：Using ancient method copy paper
Mode is manufactured paper with pulp mulberry paper；With other paper pulp with drawing paper of plagiarizing a book；Repair process for damaged historical relic ancient books.
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| CN112674448A (en) * | 2020-12-16 | 2021-04-20 | 江西中竹生物质科技有限公司 | Bamboo shoot shell fiber lunch box and manufacturing process thereof |
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