CN106835798A - A kind of high-strength kraft inner paper method for bleaching - Google Patents
A kind of high-strength kraft inner paper method for bleaching Download PDFInfo
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- CN106835798A CN106835798A CN201710213837.8A CN201710213837A CN106835798A CN 106835798 A CN106835798 A CN 106835798A CN 201710213837 A CN201710213837 A CN 201710213837A CN 106835798 A CN106835798 A CN 106835798A
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- Prior art keywords
- bleaching
- thiourea dioxide
- inner paper
- slurry
- kraft inner
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 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
- D21C9/10—Bleaching ; Apparatus therefor
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- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The invention discloses a kind of high-strength kraft inner paper method for bleaching, it is characterized in that, the alkaline thiourea dioxide water solution being configured to using NaOH and thiourea dioxide carries out bleaching to kraft inner paper slurry, slurry is pre-processed using ethylenediamine tetra-acetic acid and viscosity protective agent before bleaching, bleaching liquor pH value is 10 11, bleaching time 30 minutes, 60 DEG C or so of constant temperature, the chromophoric group selectively destroyed in paper pulp by the reproducibility of thiourea dioxide is to slurry bleaching, do not remove lignin in slurry, while bleaching effect is good, protect advantageous component in slurry, bleaching process is pollution-free, it is nontoxic, be conducive to health.
Description
Technical field
The present invention relates to Bleaching Technology field, more specifically a kind of high-strength kraft inner paper method for bleaching.
Background technology
OCC is still the primary raw material of domestic ox card, T paper and high-strength corrugated paper, as client gets over to packaging material requirement
Come higher, the special carton of commodity of some brands it is also proposed more strict requirements to the particularly brightness of paper surface color.
Therefore, the surface brightness that boxboard how is improved in the case where current process is met has important practical significance.
Existing kraft inner paper slurry bleaching technology uses chlorine bleach technology, meeting in this association with pulp bleaching processing procedure mostly
Produce substantial amounts of poisonous carcinogenic organic chloride, this organic chloride to be not only present in bleaching effluent, but also exist with
In paper, huge injury is brought to environment and human body, and bleaching process water consumption is big, wastewater flow rate is more, while waste of resource
Difficulty is brought to wastewater treatment, pulp brightness is low after chlorine bleaching, paper jaundice embrittlement, it is impossible to meet modern top grade high intensity paper
Demand.
The content of the invention
The present invention is in view of the shortcomings of the prior art, there is provided a kind of with bleaching effect is good, contaminated wastewater is small, low toxicity is tasteless height
Strong kraft inner paper method for bleaching.
The present invention realizes solving above-mentioned technical problem by following technological means：
A kind of high-strength kraft inner paper method for bleaching, it uses alkaline thiourea dioxide water solution to starch kraft inner paper and carries out at bleaching
Reason, comprises the following steps：
（1）It is prepared by bleaching liquor：A certain amount of water is added in the container equipped with agitator, and by temperature control regulation at 5 DEG C or so,
Add thiocarbamide fully to dissolve and add a certain proportion of hydrogenperoxide steam generator later, it is water-soluble fully to obtain thiourea dioxide after reaction
Liquid, it is water-soluble to adding a certain amount of sodium hydroxide solution that alkalescence thiourea dioxide is obtained in obtained thiourea dioxide water solution
Liquid；
（2）Slurry is pre-processed：Carry out being warming up to 90-95 DEG C, temperature-rise period with being passed through steam in OCC slurries to kraft inner paper manufacture
In be passed through ethylenediamine tetra-acetic acid, add viscosity protective agent and pre-processed.
（3）Stirring bleaching：The Temperature fall treatment of pretreatment disposed slurry, when temperature reaches 55-65 DEG C, adds alkaline dioxy
Change thiocarbamide bleaching liquor to be bleached, the consumption concentration of alkaline thiourea dioxide bleaching liquor is controlled in 0.8%-1.0%, and in bleaching process
In be stirred, bleaching liquor bleaching time 30 minutes, 60 DEG C or so of constant temperature.
The concentration of the initial kraft inner paper slurry is 10%-12%.
The ethylenediamine tetra-acetic acid consumption is the 0.4%-0.6% of oven dry stock amount.
In the alkaline thiourea dioxide water solution, thiourea dioxide is 2 with the proportioning of NaOH:1, bleaching liquor pH value is
10-11。
The viscosity protective agent is the one kind in sodium alginate, maltodextrin or glucose, and addition is with respect to oven dry stock
1.0%-1.2%。
The advantage of the invention is that：The present invention is using the alkaline thiourea dioxide water solution of addition NaOH to ox-hide card
Pulp material is bleached, and bleaches the chromophoric group that function is selectively destroyed in paper pulp by thiourea dioxide reproducibility, not
Lignin in slurry is removed, bleaching process is nontoxic, tasteless, ethylenediamine tetra-acetic acid is passed through using safety, before bleaching and viscosity protective agent is entered
Row pretreatment, while improve bleaching effect, the oneself viscosity of protective paste is without prejudice, is conducive into the intensity of paper.
Specific embodiment
With reference to embodiment, the invention will be further described, it is clear that these embodiments are only used for the purpose of illustration, absolutely
Do not limit the scope of the invention.
Embodiment 1
Bleaching is carried out with the slurry that OCC waste paper produces high-strength kraft inner paper as raw material, its blanching step is as follows：
（1）It is prepared by bleaching liquor：A certain amount of water is added in the container equipped with agitator, and by temperature control regulation at 5 DEG C or so,
Add thiocarbamide fully to dissolve and add a certain proportion of hydrogenperoxide steam generator later, it is water-soluble fully to obtain thiourea dioxide after reaction
Liquid, it is water-soluble to adding a certain amount of sodium hydroxide solution that alkalescence thiourea dioxide is obtained in obtained thiourea dioxide water solution
Liquid, thiourea dioxide is 2 with the proportioning of NaOH:1, bleaching liquor pH value is 10-11；
（2）Slurry is pre-processed：Before slurry pretreatment, the whiteness for determining initial OCC slurries first by whiteness test instrument is
51.6%, then carry out being warming up to 95 DEG C, temperature-rise period with being passed through steam in the OCC slurries that concentration is 10% to kraft inner paper manufacture
In be passed through ethylenediamine tetra-acetic acid, ethylenediamine tetra-acetic acid consumption is the 0.6% of oven dry stock total amount, adds viscosity protective agent glucose
Pretreatment 30 minutes is carried out,.
（3）Stirring bleaching：Pretreatment disposed slurry Temperature fall treatment, the keeping temperature when temperature reaches 60 DEG C adds alkali
Property thiourea dioxide bleaching liquor bleached, the consumption concentration of alkaline thiourea dioxide bleaching liquor is 1.0%, and in bleaching process
It is stirred, bleaching liquor bleaching time 30 minutes, 60 DEG C or so of constant temperature.
Pulp brightness after bleaching is measured as 58.2%, and brightness gain is 6.6%, and bleaching effect is preferable.
Embodiment 2
Bleaching is carried out with the slurry that OCC waste paper produces high-strength kraft inner paper as raw material, its blanching step is as follows：
（1）It is prepared by bleaching liquor：A certain amount of water is added in the container equipped with agitator, and by temperature control regulation at 5 DEG C or so,
Add thiocarbamide fully to dissolve and add a certain proportion of hydrogenperoxide steam generator later, it is water-soluble fully to obtain thiourea dioxide after reaction
Liquid, it is water-soluble to adding a certain amount of sodium hydroxide solution that alkalescence thiourea dioxide is obtained in obtained thiourea dioxide water solution
Liquid, thiourea dioxide is 2 with the proportioning of NaOH:1, bleaching liquor pH value is 10-11；
（2）Slurry is pre-processed：Before slurry pretreatment, the whiteness for determining initial OCC slurries first by whiteness test instrument is
51.8%, then carry out being warming up to 90 DEG C to being passed through steam in the OCC slurries that concentration is 12%, ethylenediamine tetraacetic is passed through in temperature-rise period
Acetic acid, ethylenediamine tetra-acetic acid consumption is the 0.5% of oven dry stock total amount, and adding viscosity protective agent glucose carries out 30 points of pretreatment
Clock.
（3）Stirring bleaching：Pretreatment disposed slurry Temperature fall treatment, the keeping temperature when temperature reaches 60 DEG C adds alkali
Property thiourea dioxide bleaching liquor bleached, the consumption concentration of alkaline thiourea dioxide bleaching liquor is 0.8%, and in bleaching process
It is stirred, bleaching liquor bleaching time 30 minutes, 60 DEG C or so of constant temperature.
Pulp brightness after bleaching is measured as 57.9%, and brightness gain is 6.1%, and bleaching effect is preferable.
Using Bleaching Technology of the present invention, by the alkaline thiourea dioxide water solution using addition NaOH to ox
Pick up pulp material is bleached, and ethylenediamine tetra-acetic acid is passed through before bleaching and viscosity protective agent is pre-processed, with drift well
White effect, it is bleaching process free from extraneous odour, pollution-free.
It should be noted that herein, if being used merely to one in the presence of first and second or the like relational terms
Individual entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operate it
Between there is any this actual relation or order.And, term " including ", "comprising" or its any other variant be intended to
Cover including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include those
Key element, but also other key elements including being not expressly set out, or also include for this process, method, article or set
Standby intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in the process including the key element, method, article or equipment.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention has been described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent to which part technical characteristic；And these modification or
Replace, do not make the spirit and scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
Claims (5)
1. a kind of high-strength kraft inner paper method for bleaching, it is characterised in that using alkaline thiourea dioxide water solution to kraft inner paper
Slurry carries out bleaching, comprises the following steps：
（1）It is prepared by bleaching liquor：A certain amount of water is added in the container equipped with agitator, and by temperature control regulation at 5 DEG C or so,
Add thiocarbamide fully to dissolve and add a certain proportion of hydrogenperoxide steam generator later, it is water-soluble fully to obtain thiourea dioxide after reaction
Liquid, it is water-soluble to adding a certain amount of sodium hydroxide solution that alkalescence thiourea dioxide is obtained in obtained thiourea dioxide water solution
Liquid；
（2）Slurry is pre-processed：Carry out being warming up to 90-95 DEG C to steam is passed through in kraft inner paper OCC slurries, be passed through in temperature-rise period
Ethylenediamine tetra-acetic acid, adds viscosity protective agent and is pre-processed；
（3）Stirring bleaching：The Temperature fall treatment of pretreatment disposed slurry, when temperature reaches 55-65 DEG C, adds alkaline sulfur dioxide
Urea bleaching liquor is bleached, and the consumption concentration of alkaline thiourea dioxide bleaching liquor is controlled in 0.8%-1.0%, and is entered in bleaching process
Row stirring, bleaching liquor bleaching time 30 minutes, 60 DEG C or so of constant temperature.
2. a kind of high-strength kraft inner paper method for bleaching according to claim 1, it is characterised in that the step（2）Middle ox
The initial concentration of pick up paper OCC slurries is 10%-12%.
3. a kind of high-strength kraft inner paper method for bleaching according to claim 1, it is characterised in that the step（2）Middle second
Ethylenediamine tetraacetic acid (EDTA) consumption is the 0.4%-0.6% of oven dry stock amount.
4. a kind of high-strength kraft inner paper method for bleaching according to claim 1, it is characterised in that the alkaline sulfur dioxide
In the urea aqueous solution, thiourea dioxide is 2 with the proportioning of NaOH:1, bleaching liquor pH value is 10-11.
5. a kind of high-strength kraft inner paper method for bleaching according to claim 1, it is characterised in that the step（2）Viscosity
Protective agent is the one kind in sodium alginate, maltodextrin or glucose, and addition is the 1.0%-1.2% of oven dry stock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710213837.8A CN106835798A (en) | 2017-04-01 | 2017-04-01 | A kind of high-strength kraft inner paper method for bleaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710213837.8A CN106835798A (en) | 2017-04-01 | 2017-04-01 | A kind of high-strength kraft inner paper method for bleaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106835798A true CN106835798A (en) | 2017-06-13 |
Family
ID=59142328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710213837.8A Withdrawn CN106835798A (en) | 2017-04-01 | 2017-04-01 | A kind of high-strength kraft inner paper method for bleaching |
Country Status (1)
| Country | Link |
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| CN (1) | CN106835798A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047083A (en) * | 2021-03-04 | 2021-06-29 | 镇江大东纸业有限公司 | Method for producing film card paper |
-
2017
- 2017-04-01 CN CN201710213837.8A patent/CN106835798A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047083A (en) * | 2021-03-04 | 2021-06-29 | 镇江大东纸业有限公司 | Method for producing film card paper |
| CN113047083B (en) * | 2021-03-04 | 2022-03-22 | 镇江大东纸业有限公司 | Method for producing film card paper |
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Legal Events
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170613 |