CN109957984A - A method of using the cellulose nano-fibrous raising paper strength of enzymatic hydrolysis - Google Patents
A method of using the cellulose nano-fibrous raising paper strength of enzymatic hydrolysis Download PDFInfo
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- CN109957984A CN109957984A CN201711337227.5A CN201711337227A CN109957984A CN 109957984 A CN109957984 A CN 109957984A CN 201711337227 A CN201711337227 A CN 201711337227A CN 109957984 A CN109957984 A CN 109957984A
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- 229920002678 cellulose Polymers 0.000 title claims abstract description 42
- 239000001913 cellulose Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000007071 enzymatic hydrolysis Effects 0.000 title claims abstract description 16
- 238000006047 enzymatic hydrolysis reaction Methods 0.000 title claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 17
- 229920002472 Starch Polymers 0.000 claims abstract description 16
- 239000008107 starch Substances 0.000 claims abstract description 16
- 235000019698 starch Nutrition 0.000 claims abstract description 16
- 238000004537 pulping Methods 0.000 claims abstract description 14
- 238000004513 sizing Methods 0.000 claims abstract description 12
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 244000166124 Eucalyptus globulus Species 0.000 claims abstract description 8
- 238000012216 screening Methods 0.000 claims abstract description 6
- 230000002708 enhancing effect Effects 0.000 claims abstract description 4
- 102000004190 Enzymes Human genes 0.000 claims description 16
- 108090000790 Enzymes Proteins 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000000725 suspension Substances 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 9
- 230000007062 hydrolysis Effects 0.000 claims description 9
- 238000006460 hydrolysis reaction Methods 0.000 claims description 9
- 230000001461 cytolytic effect Effects 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 238000010009 beating Methods 0.000 claims description 5
- 125000002091 cationic group Chemical group 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 238000006116 polymerization reaction Methods 0.000 claims description 5
- 239000002562 thickening agent Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 2
- 238000004061 bleaching Methods 0.000 claims 1
- 230000007547 defect Effects 0.000 claims 1
- 238000009955 starching Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 abstract description 2
- 238000000265 homogenisation Methods 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000002121 nanofiber Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000021197 fiber intake Nutrition 0.000 description 1
- 230000003780 keratinization Effects 0.000 description 1
- GDOPTJXRTPNYNR-UHFFFAOYSA-N methyl-cyclopentane Natural products CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- 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
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Paper (AREA)
Abstract
The invention discloses a kind of using the cellulose nano-fibrous method for improving paper strength is digested, and specific step is as follows for the method: (1) bleached eucalyptus pulp being carried out pulping first, defibrination obtains pulp material；(2) gained paper pulp is digested；(3) homogenization will be carried out to paper pulp in high pressure homogenizer after the cellulose nano-fibrous filtering after enzymatic hydrolysis；(4) Tetra Pak is slurried after pulping, separation, desanding, screening, concentration, defibrination, then reaches drying portion through approach system, wet end, press section, drying portion and forms dry paper web；(5) cellulose nano-fibrous and surface sizing starch is digested with treated, and surface coating, then the obtained paper for digesting cellulose nano-fibrous enhancing after drying, press polish, batching are carried out to paper.Method of the invention has the advantages that reinforcing effect is good, production cost is low, environment friendly is strong.
Description
Technical field
The present invention relates to pulp technology for making paper more particularly to a kind of use to digest cellulose nano-fibrous raising paper strength
Method.
Background technique
Paper pulp fiber experienced mechanical jordaning repeatedly, drying process in circulating and recovering, and it is existing to generate fiber keratinization
As to reduce paper strength.Traditional strengthening for paper method is starch to be added in slurry, but reinforcing effect is poor, and form sediment
Powder is easy to cause as bacteriotrophy base generates the normal operation that rotten slurry seriously affects paper machine.In addition also have using TEMPO(2,2,
6,6- tetramethyl piperidine oxygen radicals) nanofiber of oxidation starch interior addition to enhance the method for paper performance, but receive
Rice fiber consumption is big, at high cost, and since its specific surface area and carboxyl-content are high, greatly reduces slurry in web part of paper machine
Dehydration efficiency seriously affects paper machine production capacity.The present invention is cellulose nano-fibrous using enzymatic hydrolysis and size-press starch is after sheet formation
The drying section method that is coated realize strengthening for paper, avoid cellulose nano-fibrous to the unfavorable of wet end dehydration efficiency
It influences, strengthening for paper effect is obvious, and production cost is low.
Summary of the invention
The present invention uses bleached eucalyptus pulp (whiteness: 84~86%ISO, length: 700~850 μm, width: 15~20 μm)
As raw material.With pulper with revolving speed 20~30min of pulping of 2500~3000 rpm under 8~10% concentration, then in defibrination
Then 4000~4500 turns of defibrination in machine are carried out the enhancing of paper by following processes:
(1) it digests
Paper pulp after defibrination be added dosage be 0.20~0.25 g enzyme/kg dry pulp cellulolytic enzyme (enzyme activity: 900~
1000 IU/mL), it is 4.5~5% in pulp density, temperature is 45~55 DEG C, and pH is digested 4~5 hours under conditions of being 5~6.
The heat preservation 30~stop hydrolysis after forty minutes when temperature is improved to 75~85 DEG C, rinses and filters the fibre after hydrolysis with deionized water
Dimension, the enzymatic hydrolysis for being made required are cellulose nano-fibrous.
(2) homogeneous
Using homogenizer respectively high-pressure homogeneous 3~4 at 200~300 bar, 500~600bar and 800~900bar pressure
It is secondary, the resulting cellulose nano-fibrous end properties index of enzymatic hydrolysis are as follows: the degree of polymerization 300~400, cationic demand: 200~
300 μ eqg/g, carboxyl-content: 40~50 μ eqg/g, specific surface area: 100~150 m2/ g, diameter: 20~30nm.
(3) slurrying and copy paper
Tetra Pak is subjected to pulping with centrifugal pulper, is then handled using defibrator, good slurry is through one of desanding
(concentration 0.8~1.2%), pressurized screen screen (concentration 0.8~1.2%), then through polydisc thickener be concentrated into concentration be 3.5~
4.0%, defibrination (beating degree: 26~33 ° of SR, 12.5~15.0g of weight in wet base) then is carried out with disc mill and is slurried, then through streaming
System, wet end, press section, drying portion reach surface size press and form dry paper web, and the shake amplitude of forming table is 0~10mm, frequency
150~350 times/min, mass dryness fraction when paper reaches surface size press is 92-94%, and porosity is 60~65%, surface size press
Soft roller encapsulated 15 ° of ± 3 P&J of hardness, 30~50 kN/m of moulding pressure.
(4) it is coated with
The cellulose nano-fibrous suspension for dispersing that 0.30~0.45% wt is made in water will be digested, being then added to concentration is
8~10% surface sizing starch (pH:5.5~7.5 (when 30% suspension), viscosity: 100~1000 cp(30% concentration, 50 DEG C
When)) in glue, digesting the cellulose nano-fibrous absolute dry mass ratio with surface sizing starch is 0.5~1:10, is applied using surface
Mixed liquor is applied to paper surface by glue machine, and coating weight is 2~5 g/m2, then enzymatic hydrolysis fiber is made after drying, press polish, batching
The paper of plain nanofiber enhancing.
The present invention adopts the following technical scheme:
(1) bleached eucalyptus pulp is subjected to pulping first, defibrination obtains pulp material；
(2) gained paper pulp in step (1) is digested；
(3) homogenization is carried out in high pressure homogenizer by gained enzymatic hydrolysis is cellulose nano-fibrous in step (2).
(4) Tetra Pak is subjected to pulping, fiber separation, desanding, screening, defibrination after concentration, slurry is again through approach system, net
Portion, press section, drying portion form dry paper web and reach surface size press.
(5) gained in step (3) is digested into cellulose nano-fibrous dispersion in water and is mixed with starch glue, then carried out
Paper Coating, then the paper web that is enhanced after drying, press polish, batching.
The following examples are a further detailed description of the invention.
Embodiment 1
(1) prepared by slurry: long by 700 μm, 16 μm wide of bleached eucalyptus pulp (whiteness 85%ISO) is turned under 8% concentration with 3000rpm
Fast pulping 30min, then 4000 turns of defibrination in fiberizer, obtain paper pulp.
(2) digest cellulose nano-fibrous preparation: the paper pulp after defibrination be added cellulolytic enzyme (enzyme activity:
900IU/mL), dosage is 0.24g cellulolytic enzyme/kg dry pulp, is 4.8% in pulp density, and temperature is 45 DEG C, and pH is 5
Under the conditions of digest 4 hours.Stop hydrolysis after keeping 30min when temperature is improved to 80 DEG C, is then rinsed with deionized water and mistake
It is cellulose nano-fibrous that enzymatic hydrolysis is made in fiber after drainage solution.
(3) homogeneous: using homogenizer respectively high-pressure homogeneous 3 times under 300bar, 500bar and 850bar pressure, resulting
Digest cellulose nano-fibrous performance indicator are as follows: the degree of polymerization 324, cationic demand: 242 μ eqg/g, carboxyl-content: 45 μ
Eqg/g, specific surface area: 109.7 m2/ g, diameter: 20.4 nm.
(4) slurrying and copy paper: carrying out pulping with centrifugal pulper for Tetra Pak, then using defibrator at
Reason, good slurry is through one of desanding (concentration 0.8%), pressurized screen screening (concentration 0.8%), then is concentrated into concentration through polydisc thickener and is
3.5%, it is then carried out defibrination (beating degree: 26 ° of SR, weight in wet base 12.5g) with disc mill, then (forming table is shaken through approach system, wet end
Vibration amplitude be 5 mm, 150 times/min of frequency), press section, drying portion reach surface size press (soft encapsulated 12 P&J of hardness of roller,
30 kN/m of moulding pressure), paper mass dryness fraction is 92.4%, porosity 60.95%.
(5) it is coated with: the cellulose nano-fibrous suspension for dispersing that 0.30%wt is made in water will be digested, be then added to
The surface sizing starch (when pH:5.5(30% suspension) of concentration 8%, viscosity: 100 cp(30% concentration, at 50 DEG C)) in glue,
Digesting the cellulose nano-fibrous absolute dry mass ratio with surface sizing starch is 0.5:10, is applied mixed liquor using surface size press
For cloth to paper surface, coating weight is 2 g/m2, then the paper web that is enhanced after drying, press polish, batching.
Embodiment 2
(1) prepared by slurry: long by 800 μm, 18 μm wide of bleached eucalyptus pulp (whiteness 84%ISO) is turned under 10% concentration with 2800pm
Fast pulping 25min, then 4200 turns of defibrination in fiberizer, obtain pulp material.
(2) digest cellulose nano-fibrous preparation: cellulolytic enzyme (enzyme activity: 950 is added in the paper pulp after defibrination
IU/mL), dosage is 0.20g cellulolytic enzyme/kg dry pulp, is 5% in pulp density, temperature is 50 DEG C, the condition that pH is 5.5
Lower enzymatic hydrolysis 4.5 hours.Stop hydrolysis after keeping 40min when temperature is improved to 75 DEG C, is then rinsed and filtered with deionized water
It is cellulose nano-fibrous that enzymatic hydrolysis is made in fiber after hydrolysis.
(3) homogeneous: use homogenizer respectively high-pressure homogeneous 4 times under 250bar, 550bar and 800bar pressure.It is resulting
Digest cellulose nano-fibrous performance indicator are as follows: the degree of polymerization 350, cationic demand: 252 μ eqg/g, carboxyl-content: 50 μ
Eqg/g, specific surface area: 118.3 m2/ g, diameter: 23.6 nm.
(4) slurrying and copy paper: carrying out pulping with centrifugal pulper for Tetra Pak, then using defibrator at
Reason, good slurry is through one of desanding (concentration 1.0%), pressurized screen screening (concentration 1.2%), then is concentrated into concentration through polydisc thickener and is
3.8%, it is then carried out defibrination (beating degree: 30 ° of SR, weight in wet base 13.5g) with disc mill, then (forming table is shaken through approach system, wet end
Vibration amplitude be 8mm, 280 times/min of frequency), press section, drying portion reach surface size press (soft encapsulated 16.0 P&J of hardness of roller,
50 kN/m of moulding pressure), paper mass dryness fraction is 94%, porosity 64.47%.
(5) it is coated with: the cellulose nano-fibrous suspension for dispersing that 0.40%wt is made in water will be digested, be then added to
The surface sizing starch (when pH:6(30% suspension) of concentration 9%, viscosity: 500 cp(30% concentration, at 50 DEG C)) in glue, enzyme
Solving the cellulose nano-fibrous absolute dry mass ratio with surface sizing starch is 0.8:10, is coated with mixed liquor using surface size press
To paper surface, coating weight is 3 g/m2, then the paper web that is enhanced after drying, press polish, batching.
Embodiment 3
(1) prepared by slurry: long by 850 μm, 20 μm wide of bleached eucalyptus pulp (whiteness 86%ISO) is turned under 9% concentration with 2500pm
Fast pulping 20min, then 4500 turns of defibrination in fiberizer, obtain pulp material.
(2) digest cellulose nano-fibrous preparation: the paper pulp after defibrination be added cellulolytic enzyme (enzyme activity:
1000 IU/mL), dosage is 0.25g cellulolytic enzyme/kg dry pulp, is 4.5% in pulp density, temperature is 55 DEG C, pH 6
Under conditions of digest 5 hours.Stop hydrolysis after keeping 35min when temperature is improved to 85 DEG C, then rinsed with deionized water and
Fiber after filtering hydrolysis, it is cellulose nano-fibrous to be made enzymatic hydrolysis.
(3) homogeneous: use homogenizer respectively high-pressure homogeneous 4 times under 200bar, 600bar and 900bar pressure.It is resulting
Digest cellulose nano-fibrous performance indicator are as follows: the degree of polymerization 400, cationic demand: 289 μ eqg/g, carboxyl-content: 41 μ
Eqg/g, specific surface area: 143.9 m2/ g, diameter: 29.1 nm.
(4) slurrying and copy paper: carrying out pulping with centrifugal pulper for Tetra Pak, then using defibrator at
Reason, good slurry is through one of desanding (concentration 1.2%), pressurized screen screening (concentration 1.0%), then is concentrated into concentration through polydisc thickener and is
4.0%, it is then carried out defibrination (beating degree: 33 ° of SR, weight in wet base 15.0g) with disc mill, then (forming table is shaken through approach system, wet end
Vibration amplitude be 6mm, 350 times/min of frequency), press section, drying portion reach surface size press (soft encapsulated 18.0 P&J of hardness of roller,
40 kN/m of moulding pressure), paper mass dryness fraction is 93%, porosity 62.36%.
(5) it is coated with: the cellulose nano-fibrous suspension for dispersing that 0.45%wt is made in water will be digested, be then added to
The surface sizing starch (pH:7.5 (when 30% suspension), viscosity: 1000 cp(30% concentration, at 50 DEG C) of concentration 10%) glue
In, digesting the cellulose nano-fibrous absolute dry mass ratio with surface sizing starch is 1:10, using surface size press by mixed liquor
It is applied to paper surface, coating weight is 5 g/m2, then the paper web that is enhanced after drying, press polish, batching.
Claims (5)
1. it is a kind of using digest it is cellulose nano-fibrous improve paper strength method, which is characterized in that the method it is specific
Step are as follows: first by bleached eucalyptus pulp under 8~10% concentration with pulper with the revolving speed pulping 20 of 2500~3000 rpm~
30min, then 4000~4500 turns of defibrination in fiberizer；
Enzymatic hydrolysis: paper pulp after defibrination be added dosage be 0.20~0.25 g enzyme/kg dry pulp cellulolytic enzyme (enzyme activity:
900~1000 IU/mL), pulp density be 4.5~5.0%, temperature be 45~55 DEG C, pH be 5~6 under conditions of enzymatic hydrolysis 4~
5 hours, stop hydrolysis after 30~40min of heat preservation when temperature is improved to 75~85 DEG C, is then rinsed and filtered with deionized water
Fiber after hydrolysis, the enzymatic hydrolysis for being made required are cellulose nano-fibrous；
Homogeneous: use homogenizer respectively high-pressure homogeneous 3 at 200~300 bar, 500~600bar and 800~900bar pressure
It~4 times, obtains digesting cellulose nano-fibrous finished product；
Slurrying and copy paper: Tetra Pak is subjected to pulping with centrifugal pulper, is then handled using defibrator, good slurry
Through one of desanding (concentration 0.8~1.2%), pressurized screen screening (concentration 0.8~1.2%), then it is concentrated into through polydisc thickener dense
Degree is 3.5~4.0%, then carries out defibrination (beating degree: 26~33 ° of SR, 12.5~15.0g of weight in wet base) with disc mill, then through streaming
System, wet end, press section, drying portion reach surface size press, and the shake amplitude of forming table is 0~10mm, frequency 150~350
Secondary/min；
Coating: the cellulose nano-fibrous suspension for dispersing that 0.30~0.45% wt is made in water will be digested, is then added to
The surface sizing starch (when pH:5.5~7.5(30% suspension) that concentration is 8~10%, viscosity: 100~1000 cp(30% are dense
Degree, at 50 DEG C)) in glue, digesting the cellulose nano-fibrous absolute dry mass ratio with surface sizing starch is 0.5~1:10, is adopted
Mixed liquor is applied to paper surface with surface size press, coating weight is 2~5 g/m2, then after drying, press polish, batching be made
Digest the paper of cellulose nano-fibrous enhancing.
2. according to claim 1 using the method for digesting cellulose nano-fibrous raising paper strength, which is characterized in that
Bleaching broad-leaved eucalyptus pulp property used are as follows: whiteness: 84~86%ISO, length: 700~850 μm, width: 15~20 μm.
3. according to claim 1 using the method for digesting cellulose nano-fibrous raising paper strength, which is characterized in that
Obtained enzymatic hydrolysis is cellulose nano-fibrous, performance indicator are as follows: the degree of polymerization 300~400, cationic demand: 200~300 μ
Eqg/g, carboxyl-content: 40~50 μ eqg/g, specific surface area: 100~150 m2/ g, diameter: 20~30nm.
4. according to claim 1 using the method for digesting cellulose nano-fibrous raising paper strength, which is characterized in that
Mass dryness fraction when paper reaches surface size press is 92-94%, and porosity is 60~65%, 15 ° of the encapsulated hardness of the soft roller of surface size press
± 3 P&J, 30~50 kN/m of moulding pressure.
5. according to claim 1 using the method for digesting cellulose nano-fibrous raising paper strength, which is characterized in that
Paper strength is increased using the method for digesting the progress surface coating of cellulose nano-fibrous and surface sizing starch, avoids routine
Addition manner causes the defect of significant negative impact to paper pulp in the drainability of wet end in starching.
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Family
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110744668A (en) * | 2019-10-30 | 2020-02-04 | 凉山德农生物能源股份有限公司 | Preparation method of jatropha curcas base nano paper pulp |
| CN116867943A (en) * | 2021-01-27 | 2023-10-10 | 克拉宾股份有限公司 | White kraft cardboard, production method of the paper, uses and packaging of the paper |
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