CN116770626B - Grass fiber primary pulp with low water retention value and preparation method thereof - Google Patents
Grass fiber primary pulp with low water retention value and preparation method thereof Download PDFInfo
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- CN116770626B CN116770626B CN202310608475.8A CN202310608475A CN116770626B CN 116770626 B CN116770626 B CN 116770626B CN 202310608475 A CN202310608475 A CN 202310608475A CN 116770626 B CN116770626 B CN 116770626B
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- 239000000835 fiber Substances 0.000 title claims abstract description 76
- 244000025254 Cannabis sativa Species 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 61
- 239000010902 straw Substances 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 15
- 241000209140 Triticum Species 0.000 claims description 22
- 235000021307 Triticum Nutrition 0.000 claims description 22
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 21
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 21
- 239000003381 stabilizer Substances 0.000 claims description 21
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 20
- 241001349804 Juncus alpinoarticulatus Species 0.000 claims description 20
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 20
- 239000008367 deionised water Substances 0.000 claims description 20
- 229910021641 deionized water Inorganic materials 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 20
- 239000000126 substance Substances 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 19
- 238000007602 hot air drying Methods 0.000 claims description 17
- 238000000498 ball milling Methods 0.000 claims description 14
- 238000001125 extrusion Methods 0.000 claims description 14
- 229920001131 Pulp (paper) Polymers 0.000 claims description 13
- 235000007164 Oryza sativa Nutrition 0.000 claims description 12
- 235000009566 rice Nutrition 0.000 claims description 12
- CYEJMVLDXAUOPN-UHFFFAOYSA-N 2-dodecylphenol Chemical compound CCCCCCCCCCCCC1=CC=CC=C1O CYEJMVLDXAUOPN-UHFFFAOYSA-N 0.000 claims description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 11
- 238000010009 beating Methods 0.000 claims description 11
- 239000007822 coupling agent Substances 0.000 claims description 11
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 11
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 11
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 10
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 10
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 10
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 10
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 230000004048 modification Effects 0.000 claims description 10
- 238000012986 modification Methods 0.000 claims description 10
- 239000004408 titanium dioxide Substances 0.000 claims description 10
- 239000010456 wollastonite Substances 0.000 claims description 10
- 229910052882 wollastonite Inorganic materials 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- 239000002562 thickening agent Substances 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims 2
- 238000004049 embossing Methods 0.000 abstract description 6
- 238000003825 pressing Methods 0.000 abstract description 6
- 238000001914 filtration Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 241000209094 Oryza Species 0.000 description 10
- 230000008901 benefit Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
-
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/007—Modification of pulp properties by mechanical or physical means
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention provides a grass fiber primary pulp with a low water retention value and a preparation method thereof, belonging to the field of grass fiber primary pulp. The preparation method comprises the following steps: squeezing and concentrating, fluff generating treatment, primary drying and secondary drying. The preparation method of the grass fiber primary pulp with low water retention value can reduce the water retention value of the grass fiber primary pulp, improve the water filtering performance of the grass fiber primary pulp and reduce the shrinkage rate; the problems that the original straw fiber pulp is used for paper making by a paper machine, the waterline of the paper machine is prolonged, the moisture content of the pressed wet paper is high, embossing and crushing are easy to occur in the pressing process are effectively avoided, and the qualified rate of the finished paper is effectively improved; and the steam consumption in the drying process is reduced, the drying efficiency is improved, the drying shrinkage of paper is reduced, and the speed and the productivity of the paper machine are effectively improved.
Description
Technical Field
The invention relates to the field of grass fiber primary pulp, in particular to grass fiber primary pulp with a low water retention value and a preparation method thereof.
Background
The primary pulp of grass fiber is paper-making pulp prepared by using grass natural plant fiber such as wheat straw, rice straw and the like as raw material and adopting chemical mechanical method, chemical method and the like. Pulping by adopting grass fiber raw materials has long history in China, has rich production experience, and has an important role in the papermaking industry until the present. The grass fiber primary pulp has the advantages of rich raw material sources, easy pulping, low cost and the like, and can effectively recycle a large amount of agricultural wastes such as wheat straw, rice straw and the like generated in agricultural planting.
However, the conventional grass fiber raw pulp has the following defects:
1) The grass fiber has the characteristics of short fiber, high content of fine fiber, high content of mixed cells and silicon, large specific surface area of fiber, easy dissolution of lignin and hemicellulose, and the like, so that the primary pulp of the grass fiber is difficult to filter water;
2) The shrinkage rate of the grass fiber raw pulp is high due to high beating degree, high swelling and hydration degree, large shrinkage after water loss and the like of the grass fiber raw pulp;
3) The water retention value of the grass fiber primary pulp is high.
The defects of the grass fiber primary pulp comprehensively lead to the fact that after the grass fiber primary pulp is used for paper making by a paper machine, the waterline of the paper machine is prolonged, the moisture content of the pressed wet paper is high, and embossing and crushing phenomena are easy to occur in the pressing process; the prepared finished paper is easy to have the problems of crease, crease and the like, and the qualification rate of the finished paper is low; in addition, in the drying process, the consumption of drying steam is large, the shrinkage rate of paper after drying is high, the production efficiency is low, the speed and the productivity of a paper machine are seriously affected, and the paper making benefit is further affected.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides the grass fiber primary pulp with low water retention value and the preparation method thereof, which can reduce the water retention value of the grass fiber primary pulp, improve the water filtering performance of the grass fiber primary pulp and reduce the shrinkage rate; the problems that the original straw fiber pulp is used for paper making by a paper machine, the waterline of the paper machine is prolonged, the moisture content of the pressed wet paper is high, embossing and crushing are easy to occur in the pressing process are effectively avoided, and the qualified rate of the finished paper is effectively improved; and the steam consumption in the drying process is reduced, the drying efficiency is improved, the drying shrinkage of paper is reduced, and the speed and the productivity of the paper machine are effectively improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the preparation method of the grass fiber primary pulp with low water retention value comprises the following steps: squeezing and concentrating, fluff generating treatment, primary drying and secondary drying.
And (3) extruding and concentrating, namely introducing the crude straw fiber pulp into an extruding and concentrating machine, and extruding and concentrating until the dryness of the pulp is 40-45%, so as to obtain concentrated pulp.
In the extrusion concentration, the grass fiber primary pulp is a composition of wheat straw primary pulp, rice straw primary pulp and Chinese alpine rush primary pulp. Preferably, the weight ratio of the wheat straw primary pulp to the rice straw primary pulp to the Chinese alpine rush primary pulp is 4-5:4-5:1-2.
Preferably, the wheat straw primary pulp is wheat straw chemical mechanical pulp, the concentration is 7-8%, and the water retention value is 221-230%;
the original straw pulp is straw chemical mechanical pulp with the concentration of 7-8% and the water retention value of 223-229%;
the raw Chinese alpine rush pulp is Chinese alpine rush chemical mechanical pulp with the concentration of 9-10% and the water retention value of 207-216%.
And (3) performing fluff generation treatment, namely performing fluff generation treatment on the concentrated slurry until the slurry beating degree is 55-60 DEG SR and the shrinkage rate is 6-7%, so as to obtain fluff slurry.
Preferably, in the fluff generation process, the feeding speed of the concentrated slurry into the fluff generator is 400-500kg/40min, and the fluff generation blade gap in the fluff generator is 1-2mm.
And (3) performing primary drying, namely performing primary hot air drying on the fluff pulp until the dryness of the pulp is 70-75%, and discharging to obtain primary drying pulp.
Preferably, in the primary hot air drying process, the drying temperature is controlled to be 120-130 ℃, and the discharging temperature is controlled to be 80-90 ℃.
And (3) secondary drying, namely adding the modified stabilizer into the primary drying pulp, uniformly mixing, performing secondary hot air drying until the dryness of the pulp is 80-90%, and discharging to obtain the grass fiber primary pulp with low water retention value.
Preferably, the addition amount of the modified stabilizer is 5-7% of the weight of the primary drying slurry;
in the secondary hot air drying process, the drying temperature is controlled to be 115-125 ℃, and the discharging temperature is controlled to be 80-90 ℃.
The modified stabilizer is prepared by the following steps: pretreatment and modification;
the pretreatment is carried out by ball milling for heavy calcium carbonate, wollastonite, titanium dioxide, silane coupling agent KH-550, carboxymethyl cellulose and deionized water, and vacuum drying until the water content is 5-8wt% to obtain the pretreatment.
Preferably, in the pretreatment, in the ball milling process, the ball milling ball material ratio is controlled to be 4-6:1, the ball milling rotating speed is controlled to be 150-250rpm, and the ball milling time is controlled to be 1-2h.
Preferably, the weight ratio of the heavy calcium carbonate to the wollastonite to the titanium dioxide to the silane coupling agent KH-550 to the carboxymethyl cellulose to the deionized water is 25-30:12-15:2-3:1.5-2:0.2-0.3:20-25.
The modification, namely adding polyvinyl alcohol 1799 and polyvinyl alcohol 2088 into deionized water, stirring and heating to 75-85 ℃, and preserving heat and stirring for 30-40min; then adding titanate coupling agent 201 and dodecylphenol polyoxyethylene ether OP-10, and under the stirring condition, carrying out heat preservation and reflux for 1-2h, and cooling to 40-50 ℃; continuously adding the pretreated substance, stirring for 1-2h, evaporating and concentrating to 60-65% of the original weight to obtain the modified stabilizer.
Preferably, the weight ratio of the polyvinyl alcohol 1799 to the polyvinyl alcohol 2088 to the titanate coupling agent 201 to the dodecylphenol polyoxyethylene ether OP-10 to the pretreated matter to the deionized water is 1.5-2:0.5-1:1-1.2:0.2-0.3:80-100:120-130.
The grass fiber primary pulp with low water retention value is prepared by adopting the preparation method; the beating degree of the grass fiber primary pulp with low water retention value is 31-35 DEG SR, the shrinkage is 0.8-1.3%, and the water retention value is 178-190%.
Compared with the prior art, the invention has the beneficial effects that:
(1) The preparation method of the grass fiber primary pulp with low water retention value can reduce the water retention value of the grass fiber primary pulp, improve the water filtering performance of the grass fiber primary pulp and reduce the shrinkage rate; the problems that the original straw fiber pulp is used for paper making by a paper machine, the waterline of the paper machine is prolonged, the moisture content of the pressed wet paper is high, embossing and crushing are easy to occur in the pressing process are effectively avoided, and the qualified rate of the finished paper is effectively improved; and the steam consumption in the drying process is reduced, the drying efficiency is improved, the drying shrinkage of paper is reduced, and the speed and the productivity of the paper machine are effectively improved.
(2) The grass fiber primary pulp with low water retention value has the beating degree of 31-35 DEG SR, and effectively improves the water filtering performance of the grass fiber primary pulp; the water retention value is 178-190%, so that the steam consumption in the drying process is effectively reduced, and the drying efficiency is improved; meanwhile, the drying shrinkage rate of the paper is 0.8-1.3%, and the paper size stability is good.
(3) Compared with untreated grass fiber primary pulp, the grass fiber primary pulp with low water retention value is used for paper making by a paper machine, and the dryness of the paper machine wire part pulp is improved from 16.2% to 17.8%, so that the problem of water line extension is solved; the dryness of the squeezed material is improved from 34.5% to 38.9%, so that the steam consumption in the subsequent drying process is effectively reduced, and the drying efficiency is effectively improved.
(4) The grass fiber primary pulp with low water retention value is used in paper making by a paper machine, no embossing and crushing phenomenon occurs in the continuous pressing of the paper machine for 168 hours, and the prepared finished paper has no crease, crease and other problems, so that the finished paper qualification rate is effectively improved.
(5) The grass fiber primary pulp with low water retention value is used in paper machine papermaking, the speed of a paper machine can be increased by 100m per minute on the basis of the original speed, the daily productivity is increased by 100t, and the production efficiency is further improved; under the condition of the same gram weight of paper, the cost of pulp per ton can be reduced by 36.3 Yuan Renzhen, and the paper making benefit is further improved.
Detailed Description
Specific embodiments of the present invention will now be described in order to provide a clearer understanding of the technical features, objects and effects of the present invention.
Example 1
A preparation method of grass fiber primary pulp with low water retention value comprises the following steps:
1) Extrusion concentration
The crude pulp of the grass fiber is led into an extrusion thickener for extrusion concentration treatment until the dryness of the pulp is 40 percent, and the concentrated pulp is prepared.
Wherein the grass fiber primary pulp is a composition of wheat straw primary pulp, rice straw primary pulp and Chinese alpine rush primary pulp. The weight ratio of the wheat straw primary pulp to the rice straw primary pulp to the Chinese alpine rush primary pulp is 4:4:1.
The wheat straw primary pulp is wheat straw chemical mechanical pulp, the concentration is 7%, and the water retention value is 221%.
The original straw pulp is straw chemimechanical pulp, the concentration is 7%, and the water retention value is 223%.
The raw Chinese alpine rush pulp is Chinese alpine rush chemical mechanical pulp with the concentration of 9 percent and the water retention value of 207 percent.
2) Fluff generation treatment
The concentrated pulp was fed to a fluff generator at a feed rate of 400kg/40min, and fluff generation treatment was performed by controlling the gap between fluff generation blades in the fluff generator to 1mm until the pulp beating degree was 55 DEG SR and the shrinkage was 6%, to thereby obtain fluff pulp.
3) Primary drying
And (3) carrying out primary hot air drying on the fluff pulp until the dryness of the pulp is 70%, and discharging to obtain primary drying pulp.
In the primary hot air drying process, the drying temperature is controlled to be 120 ℃, and the discharging temperature is controlled to be 80 ℃.
4) Secondary drying
And (3) adding the modified stabilizer into the primary drying pulp, uniformly mixing, carrying out secondary hot air drying until the dryness of the pulp is 80%, and discharging to obtain the grass fiber primary pulp with low water retention value.
The addition amount of the modified stabilizer was 7% by weight of the primary dry pulp.
In the secondary hot air drying process, the drying temperature is controlled to be 115 ℃, and the discharging temperature is controlled to be 80 ℃.
Wherein, the modified stabilizer is prepared by the following method:
a. pretreatment of
Heavy calcium carbonate, wollastonite, titanium dioxide, silane coupling agent KH-550, carboxymethyl cellulose and deionized water are put into a ball mill, the ball-material ratio in the ball mill is controlled to be 4:1, the ball milling speed is 150rpm, and after ball milling is carried out for 1h, the pretreated material is prepared by vacuum drying until the water content is 5 wt%.
The weight ratio of the heavy calcium carbonate to the wollastonite to the titanium dioxide to the silane coupling agent KH-550 to the carboxymethyl cellulose to the deionized water is 25:12:2:1.5:0.2:20.
b. Modification
Adding polyvinyl alcohol 1799 and polyvinyl alcohol 2088 into deionized water, stirring and heating to 75 ℃, and keeping the temperature and stirring for 30min; then adding titanate coupling agent 201 and dodecylphenol polyoxyethylene ether OP-10, and cooling to 40 ℃ after heat preservation and reflux for 1h under the stirring condition; continuously adding the pretreated substance, stirring for 1h, evaporating and concentrating to 60% of the original weight to obtain the modified stabilizer.
The weight ratio of polyvinyl alcohol 1799 to polyvinyl alcohol 2088 to titanate coupling agent 201 to dodecylphenol polyoxyethylene ether OP-10 to pretreatment to deionized water is 1.5:0.5:1:0.2:80:120.
The grass fiber raw pulp with low water retention value prepared in the embodiment has a beating degree of 32 DEG SR, a shrinkage of 0.9% and a water retention value of 182%.
Example 2
A preparation method of grass fiber primary pulp with low water retention value comprises the following steps:
1) Extrusion concentration
The crude pulp of the grass fiber is led into an extrusion thickener for extrusion concentration treatment until the dryness of the pulp is 42 percent, thus preparing concentrated pulp.
Wherein the grass fiber primary pulp is a composition of wheat straw primary pulp, rice straw primary pulp and Chinese alpine rush primary pulp. The weight ratio of the wheat straw primary pulp to the rice straw primary pulp to the Chinese alpine rush primary pulp is 4.5:4.5:2.
The wheat straw primary pulp is wheat straw chemical mechanical pulp, the concentration is 7.5%, and the water retention value is 225%.
The original straw pulp is straw chemical mechanical pulp, the concentration is 7.5%, and the water retention value is 226%.
The raw Chinese alpine rush pulp is Chinese alpine rush chemical mechanical pulp with the concentration of 9-10% and the water retention value of 210%.
2) Fluff generation treatment
The concentrated pulp was fed to a fluff generator at a feed rate of 450kg/40min, and fluff generation treatment was performed by controlling the gap between fluff generation blades in the fluff generator to 1.4mm until the pulp had a freeness of 57 ° SR and a shrinkage of 6.5%, to obtain fluff pulp.
3) Primary drying
And (3) carrying out primary hot air drying on the fluff pulp until the dryness of the pulp is 72%, and discharging to obtain primary drying pulp.
In the primary hot air drying process, the drying temperature is controlled to be 125 ℃, and the discharging temperature is controlled to be 85 ℃.
4) Secondary drying
And (3) adding the modified stabilizer into the primary drying pulp, uniformly mixing, carrying out secondary hot air drying until the dryness of the pulp is 85%, and discharging to obtain the grass fiber primary pulp with low water retention value.
The addition amount of the modified stabilizer was 6% by weight of the primary dry pulp.
In the secondary hot air drying process, the drying temperature is controlled to be 120 ℃, and the discharging temperature is controlled to be 85 ℃.
Wherein, the modified stabilizer is prepared by the following method:
a. pretreatment of
Heavy calcium carbonate, wollastonite, titanium dioxide, silane coupling agent KH-550, carboxymethyl cellulose and deionized water are put into a ball mill, the ball-material ratio in the ball mill is controlled to be 5:1, the ball mill is carried out at a ball milling rotating speed of 200rpm for 1.5 hours, and then the pretreated material is prepared by vacuum drying until the water content is 6 wt%.
The weight ratio of the heavy calcium carbonate to the wollastonite to the titanium dioxide to the silane coupling agent KH-550 to the carboxymethyl cellulose to the deionized water is 28:13:2.5:1.8:0.25:22.
b. Modification
Adding polyvinyl alcohol 1799 and polyvinyl alcohol 2088 into deionized water, stirring and heating to 80 ℃, and preserving heat and stirring for 35min; then adding titanate coupling agent 201 and dodecylphenol polyoxyethylene ether OP-10, and cooling to 45 ℃ after heat preservation and reflux for 1.5 hours under the stirring condition; continuously adding the pretreated substance, stirring for 1.5h, evaporating and concentrating to 62% of the original weight to obtain the modified stabilizer.
The weight ratio of polyvinyl alcohol 1799 to polyvinyl alcohol 2088 to titanate coupling agent 201 to dodecylphenol polyoxyethylene ether OP-10 to pretreatment to deionized water is 1.8:0.7:1.1:0.25:90:125.
The grass fiber raw pulp with low water retention value prepared in the embodiment has a beating degree of 31 DEG SR, a shrinkage of 0.8% and a water retention value of 178%.
Example 3
A preparation method of grass fiber primary pulp with low water retention value comprises the following steps:
1) Extrusion concentration
The crude pulp of the grass fiber is led into an extrusion thickener for extrusion concentration treatment until the dryness of the pulp is 45 percent, thus obtaining concentrated pulp.
Wherein the grass fiber primary pulp is a composition of wheat straw primary pulp, rice straw primary pulp and Chinese alpine rush primary pulp. The weight ratio of the wheat straw primary pulp to the rice straw primary pulp to the Chinese alpine rush primary pulp is 5:5:1.5.
The wheat straw primary pulp is wheat straw chemical mechanical pulp, the concentration is 8%, and the water retention value is 230%.
The original straw pulp is straw chemimechanical pulp, the concentration is 8%, and the water retention value is 229%.
The raw Chinese alpine rush pulp is Chinese alpine rush chemical mechanical pulp with the concentration of 10 percent and the water retention value of 216 percent.
2) Fluff generation treatment
The concentrated pulp was fed to a fluff generator at a feed rate of 500kg/40min, and fluff generation treatment was performed by controlling the gap between fluff generation blades in the fluff generator to 2mm until the pulp had a freeness of 60 ° SR and a shrinkage of 7%, to obtain fluff pulp.
3) Primary drying
And (3) carrying out primary hot air drying on the fluff pulp until the dryness of the pulp is 75%, and discharging to obtain primary drying pulp.
In the primary hot air drying process, the drying temperature is controlled to be 130 ℃, and the discharging temperature is controlled to be 90 ℃.
4) Secondary drying
And (3) adding the modified stabilizer into the primary drying pulp, uniformly mixing, carrying out secondary hot air drying until the dryness of the pulp is 90%, and discharging to obtain the grass fiber primary pulp with low water retention value.
The addition amount of the modified stabilizer is 5% of the weight of the primary drying pulp.
In the secondary hot air drying process, the drying temperature is controlled to be 125 ℃, and the discharging temperature is controlled to be 90 ℃.
Wherein, the modified stabilizer is prepared by the following method:
a. pretreatment of
Heavy calcium carbonate, wollastonite, titanium dioxide, silane coupling agent KH-550, carboxymethyl cellulose and deionized water are put into a ball mill, the ball-material ratio in the ball mill is controlled to be 6:1, the ball mill is carried out at the ball mill rotating speed of 250rpm, and after ball milling is carried out for 2 hours, the pretreated material is prepared by vacuum drying until the water content is 8 wt%.
The weight ratio of the heavy calcium carbonate to the wollastonite to the titanium dioxide to the silane coupling agent KH-550 to the carboxymethyl cellulose to the deionized water is 30:15:3:2:0.3:25.
b. Modification
Adding polyvinyl alcohol 1799 and polyvinyl alcohol 2088 into deionized water, stirring and heating to 85 ℃, and keeping the temperature and stirring for 40min; then adding titanate coupling agent 201 and dodecylphenol polyoxyethylene ether OP-10, and cooling to 50 ℃ after heat preservation and reflux for 2 hours under the stirring condition; continuously adding the pretreated substance, stirring for 2 hours, evaporating and concentrating to 65% of the original weight, and obtaining the modified stabilizer.
The weight ratio of polyvinyl alcohol 1799 to polyvinyl alcohol 2088 to titanate coupling agent 201 to dodecylphenol polyoxyethylene ether OP-10 to pretreatment to deionized water is 2:1:1.2:0.3:100:130.
The grass fiber raw pulp with low water retention value prepared in the embodiment has a beating degree of 35 DEG SR, a shrinkage of 1.3% and a water retention value of 190%.
Comparative example 1
The technical scheme of the embodiment 2 is adopted, and the difference is that: 1) In the preparation of the modified stabilizer, a pretreatment step is omitted; 2) In the modification step, the addition of the polyvinyl alcohol 2088, the titanate coupling agent 201 and the dodecylphenol polyoxyethylene ether OP-10 is omitted.
The original pulp of grass fiber prepared in comparative example 1 has a beating degree of 45 DEG SR, a shrinkage of 3.7% and a water retention value of 203%.
Test example 1
The untreated grass fiber raw pulp and the grass fiber raw pulp prepared in the example 2 are respectively used for paper making by a paper machine. Through experiments, compared with untreated grass fiber primary pulp, the grass fiber primary pulp prepared in the embodiment 2 is adopted, the dryness of pulp at the wire part of a paper machine is improved from 16.2% to 17.8%, and the problem of no water line extension is solved; the dryness of the pressed material is improved from 34.5% to 38.9%, so that the steam consumption in the subsequent drying process is effectively reduced, and the drying efficiency is effectively improved; meanwhile, no embossing and crushing phenomena occur in the continuous pressing 168h of the paper machine, and the prepared finished paper has no crease, crease and other problems, so that the qualified rate of the finished paper is effectively improved; the speed of the paper machine can be increased by 100m per minute on the basis of the original speed, the daily productivity is increased by 100t, and the production efficiency is further improved; under the condition of the same gram weight of paper, the cost of pulp per ton can be reduced by 36.3 Yuan Renzhen, and the paper making benefit is further improved.
The percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The preparation method of the grass fiber primary pulp with low water retention value is characterized by comprising the following steps: squeezing and concentrating, fluff generating treatment, primary drying and secondary drying;
the raw pulp of the grass fiber is led into an extrusion thickener for extrusion concentration treatment until the dryness of the pulp is 40-45%, and the concentrated pulp is prepared;
in the extrusion concentration, the grass fiber primary pulp is a composition of wheat straw primary pulp, rice straw primary pulp and Chinese alpine rush primary pulp;
the fluff generation treatment is carried out on the concentrated slurry until the slurry beating degree is 55-60 DEG SR and the shrinkage rate is 6-7%, so as to prepare fluff slurry;
the primary drying is carried out, the fluff pulp is dried by primary hot air until the dryness of the pulp is 70-75%, and the primary drying pulp is prepared by discharging;
the secondary drying is carried out, the modified stabilizer is put into the primary drying pulp, after being uniformly mixed, the secondary hot air drying is carried out until the dryness of the pulp is 80-90%, and the raw pulp of the grass fiber with low water retention value is prepared after discharging;
the modified stabilizer is prepared by the following steps: pretreatment and modification;
the pretreatment is carried out, after ball milling is carried out on heavy calcium carbonate, wollastonite, titanium dioxide, silane coupling agent KH-550, carboxymethyl cellulose and deionized water, the mixture is dried in vacuum until the water content is 5-8wt% to prepare a pretreated substance;
in the pretreatment, in the ball milling process, the ball milling ball material ratio is controlled to be 4-6:1, the ball milling rotating speed is controlled to be 150-250rpm, and the ball milling time is controlled to be 1-2h;
the weight ratio of the heavy calcium carbonate to the wollastonite to the titanium dioxide to the silane coupling agent KH-550 to the carboxymethyl cellulose to the deionized water is 25-30:12-15:2-3:1.5-2:0.2-0.3:20-25;
the modification, namely adding polyvinyl alcohol 1799 and polyvinyl alcohol 2088 into deionized water, stirring and heating; then adding titanate coupling agent 201 and dodecylphenol polyoxyethylene ether OP-10, and under the stirring condition, carrying out heat preservation and reflux for 1-2h, and cooling to 40-50 ℃; continuously adding the pretreated matter, stirring, evaporating and concentrating to obtain a modified stabilizer;
the weight ratio of the polyvinyl alcohol 1799 to the polyvinyl alcohol 2088 to the titanate coupling agent 201 to the dodecylphenol polyoxyethylene ether OP-10 to the pretreated matter to the deionized water is 1.5-2:0.5-1:1-1.2:0.2-0.3:80-100:120-130.
2. The method for preparing grass fiber raw pulp with low water retention value according to claim 1, wherein in the extrusion concentration, the weight ratio of wheat straw raw pulp to rice straw raw pulp to Chinese alpine rush raw pulp is 4-5:4-5:1-2;
the wheat straw primary pulp is wheat straw chemical mechanical pulp with the concentration of 7-8% and the water retention value of 221-230%;
the original straw pulp is straw chemical mechanical pulp with the concentration of 7-8% and the water retention value of 223-229%;
the raw Chinese alpine rush pulp is Chinese alpine rush chemical mechanical pulp with the concentration of 9-10% and the water retention value of 207-216%.
3. A method for producing a low water retention grass fiber raw pulp as claimed in claim 1, wherein in said fluff generation treatment, the feeding speed of the concentrated pulp to the fluff generator is 400-500kg/40min, and the fluff generation blade gap in the fluff generator is 1-2mm.
4. The method for preparing a low water retention value grass fiber raw pulp according to claim 1, wherein in the primary drying, the drying temperature is controlled to be 120-130 ℃ and the discharging temperature is controlled to be 80-90 ℃;
in the secondary drying, the drying temperature is controlled to be 115-125 ℃, and the discharging temperature is controlled to be 80-90 ℃.
5. The method for preparing a low water retention straw fiber pulp according to claim 1, wherein the amount of the modified stabilizer added in the secondary drying is 5-7% of the weight of the primary drying pulp.
6. A low water retention grass fiber raw pulp, characterized in that the grass fiber raw pulp is prepared by the preparation method of any one of claims 1-5, the beating degree of the low water retention grass fiber raw pulp is 31-35 degrees SR, the shrinkage is 0.8-1.3%, and the water retention value is 178-190%.
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