CN111576087B - AKD emulsion stabilized by PAE and sodium alginate combined synergist and preparation method thereof - Google Patents
AKD emulsion stabilized by PAE and sodium alginate combined synergist and preparation method thereof Download PDFInfo
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- CN111576087B CN111576087B CN202010501842.0A CN202010501842A CN111576087B CN 111576087 B CN111576087 B CN 111576087B CN 202010501842 A CN202010501842 A CN 202010501842A CN 111576087 B CN111576087 B CN 111576087B
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- pae
- sodium alginate
- akd
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- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/17—Ketenes, e.g. ketene dimers
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/30—Alginic acid or alginates
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/53—Polyethers; Polyesters
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention provides stable AKD emulsion of a PAE and sodium alginate combined synergist and a preparation method thereof. The obtained emulsifier has good stability, small dosage, good effect and low cost. The AKD emulsion obtained after emulsification has good stability, is applied to surface sizing, has excellent sizing effect, and is beneficial to reducing sizing cost while ensuring the sizing effect of paper.
Description
Technical Field
The invention belongs to the technical field of papermaking AKD sizing, and particularly relates to AKD emulsion stabilized by a PAE and sodium alginate combined synergist and a preparation method thereof.
Background
The reactive neutral sizing agent AKD is a medium-alkaline sizing agent widely applied in paper mills at present, and does not need field emulsification. AKD sizing can be applied to internal sizing or surface sizing of the papermaking stock. Cationic starch is generally used as a common emulsifier for AKD sizing to make AKD emulsions. In recent years, cationic high molecular polymers such as polyamine have been widely used as a synergist for AKD, and among them, researches on emulsifiers and petrochemical synthetic reagents that avoid a chlorine footprint have been greatly receiving attention from researchers. PAE is a wet strength agent widely used for papermaking, has good adsorbability on fibers, can be used as an AKD synergist, improves the adsorption of AKD on the fibers, inhibits the hydrolysis of the AKD, further improves the sizing effect of the AKD, and improves the curing rate, but the cost of the PAE is relatively high.
The seaweed gel is polysaccharide carbohydrate extracted from seaweed, has wide source, and is a cheap resource suitable for papermaking. When the paper is applied to papermaking, the paper is not easy to turn yellow compared with common paper, and the durability is good. The method for preparing the AKD emulsion by adopting the synergistic system of the PAE and the sodium alginate as the emulsifier is simple, is beneficial to the development of green papermaking, and has important significance for improving the AKD sizing effect and reducing the dosage of the PAE and the AKD.
Disclosure of Invention
In order to solve the technical problems, the invention provides an AKD emulsion with stable PAE and sodium alginate combined synergist and a preparation method thereof. The invention also aims to solve the technical problem that the sodium alginate used as a synergist for emulsifying and preparing the AKD emulsion is applied to the papermaking field so as to improve the application value of the sodium alginate in the papermaking sizing field.
In order to solve the problems, the technical scheme adopted by the invention is as follows: an AKD emulsion stabilized by PAE and sodium alginate combined synergist is prepared by mixing PAE, sodium alginate and reactive sizing agent AKD.
Further, the components are as follows in parts by weight:
further, the PAE has a solid content of 12.5%, a viscosity of 30.3mPa.s, a pH of 4.4 and a density of 1.15 g/mL.
Further, the viscosity of the sodium alginate is 175mPa.s, 350mPa.s and 415 mPa.s.
A preparation method of AKD emulsion stabilized by PAE and sodium alginate combined synergist specifically comprises the following steps:
1) dissolving sodium alginate in appropriate amount of water, and magnetically stirring to disperse the sodium alginate uniformly;
2) dissolving PAE in a proper amount of water at room temperature, magnetically stirring for 10 minutes, and uniformly dispersing;
3) and (3) dispersing the AKD wax sheet in a water bath for melting and heating, then adding the sodium alginate prepared in the step (1) and the step (2) and PAE together, and shearing and stirring at a high speed to prepare the AKD emulsion.
Further, the dissolution concentration of sodium alginate in the step (1) was 0.005 g/mL.
Further, the dissolution concentration of PAE in the step (2) was 1 wt%.
Further, the shear stirring rate of AKD in the step (3) is 10000r/min, and the stirring time is 3 minutes.
Compared with the prior art, the invention has the following beneficial effects: in the AKD emulsifier prepared by the invention, the use of sodium alginate can effectively reduce the dosage of PAE and AKD and reduce the sizing cost. The solubility of sodium alginate in water is low, so that the solution has low dissolution concentration, and the adopted dissolution concentration is 0.003 g/mL. The reduction of the PAE consumption plays an important role in reducing the content of effective chlorine and the problem of water pollution of a paper mill, and can enhance the environmental protection. The sodium alginate can be prepared from seaweed which generates the phenomenon of 'bloom', can also be obtained from kelp, has a price which is much lower than that of micro-nano cellulose, and is very suitable for popularization and use in paper-making enterprises. The preparation method has the advantages of easily obtained raw materials, simple equipment and easy operation.
Detailed Description
The following examples further describe embodiments of the present invention in detail. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
(1) Dissolving sodium alginate with viscosity of 175mPa.s in appropriate amount of water to make concentration 0.003g/mL, and magnetically stirring to disperse the sodium alginate uniformly.
(2) The PAE was dissolved in an appropriate amount of water at room temperature to a concentration of 1%, magnetically stirred for 10 minutes, and dispersed uniformly.
(3) Heating 100 parts of AKD wax sheet in water bath, then pouring sodium alginate and PAE combined emulsifier into the AKD wax sheet oily liquid at one time, shearing and stirring at a high speed of 10000r/min for 3 minutes to prepare AKD emulsion, so that the PAE: sodium alginate: AKD ═ 1:1: 1.
Example 2
(1) Dissolving sodium alginate with viscosity of 350mPa.s in appropriate amount of water to reach concentration, and magnetically stirring to disperse the sodium alginate uniformly.
(2) The PAE was dissolved in an appropriate amount of water at room temperature to a concentration of 1%, magnetically stirred for 10 minutes, and dispersed uniformly.
(3) Heating 100 parts of AKD wax sheet in water bath, and then pouring sodium alginate and PAE combined emulsifier into the AKD wax sheet oily liquid at one time to ensure that the ratio of PAE: sodium alginate: and (3) performing high-speed shearing and stirring on the AKD (alkyl ketene dimer) 1:1:1 at 10000r/min for 3 minutes to prepare the AKD emulsion.
Example 3
(1) Dissolving sodium alginate with viscosity of 415mPa.s in appropriate amount of water to make concentration 0.003g/mL, and magnetically stirring to disperse the solution uniformly.
(2) The PAE was dissolved in an appropriate amount of water at room temperature to a concentration of 1%, magnetically stirred for 10 minutes, and dispersed uniformly.
(3) Heating 100 parts of AKD wax sheet in water bath, and then pouring sodium alginate and PAE combined emulsifier into the AKD wax sheet oily liquid at one time to ensure that the ratio of PAE: sodium alginate: and (3) performing high-speed shearing and stirring on the AKD (alkyl ketene dimer) 1:1:1 at 10000r/min for 3 minutes to prepare the AKD emulsion.
Example 4
(1) Sodium alginate with the viscosity of 350mPa.s is dissolved in a proper amount of water to ensure that the concentration is 0.003g/mL, and the mixture is uniformly dispersed by magnetic stirring.
(2) The PAE was dissolved in an appropriate amount of water at room temperature to a concentration of 1%, magnetically stirred for 10 minutes, and dispersed uniformly.
(3) Heating 100 parts of AKD wax sheet in water bath, and then pouring sodium alginate and PAE combined emulsifier into the AKD wax sheet oily liquid at one time to ensure that the ratio of PAE: sodium alginate: and (3) performing high-speed shearing and stirring on the AKD (alkyl ketene dimer) 1:1.5:1 at a speed of 10000r/min for 3 minutes to prepare the AKD emulsion.
Example 5
(1) Sodium alginate with the viscosity of 350mPa.s is dissolved in a proper amount of water to ensure that the concentration is 0.003g/mL, and the mixture is uniformly dispersed by magnetic stirring.
(2) The PAE was dissolved in an appropriate amount of water at room temperature to a concentration of 1%, magnetically stirred for 10 minutes, and dispersed uniformly.
(3) Heating 100 parts of AKD wax sheet in water bath, and then pouring sodium alginate and PAE combined emulsifier into the AKD wax sheet oily liquid at one time to ensure that the ratio of PAE: sodium alginate: and (3) performing high-speed shearing and stirring on the AKD (alkyl ketene dimer) 1:2:1 at 10000r/min for 3 minutes to prepare the AKD emulsion.
Comparative experimental example:
an unsized base paper was used as a comparative example.
Papermaking:
the prepared AKD emulsion was diluted to a certain concentration with deionized water and then used for internal sizing at a dosage of 0.2% (relative to oven dried pulp). Selecting 1% broadleaf wood pulp by mass fraction, sequentially adding AKD emulsion, stirring for 1min at 500r/min, adding 0.03% cationic polyacrylamide, then accelerating to 1200r/min, then adding 0.2 wt% bentonite, stirring for 1min at 500r/min, making paper with a quantitative of 60g/m2, and drying (105 ℃) for 30min in an oven. The Cobb value of the paper was determined using the standard GB/T1540-2002.
Note: the dosage of AKD is 0.2 wt% of the pulp fiber, and the dosages of chitosan and nano zinc oxide are relative to the dosage of AKD of the papermaking sizing agent.
As seen from the table, compared with the base paper, the stable AKD emulsion of the PAE and sodium alginate combined synergist has a remarkable sizing effect. The sizing effect is related to the viscosity of the sodium alginate and the dosage of the sodium alginate. The specific expression is that the sizing effect of the paper is obviously increased along with the increase of the using amount of the sodium alginate when the viscosity of the sodium alginate (the molecular weight of the sodium alginate) is constant; the paper sizing effect is most obvious when the adding proportion of the combined synergistic emulsifier PAE and the sodium alginate is fixed and the viscosity of the sodium alginate is 350 mPa.s. The increase of the sodium alginate dosage promotes the sizing effect, is beneficial to reducing the dosage of the wet strength agent PAE and reduces the sizing cost. The molecular weight of sodium alginate influences the adsorption crosslinking between PAE, AKD and fibers, the too small PAE molecular weight is not sufficient in crosslinking adsorption combination, and the too large molecular weight can increase the steric hindrance of reaction, thus being not beneficial to the presentation of sizing effect.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (1)
1. An AKD emulsion stabilized by a PAE and sodium alginate combined synergist is characterized in that: is prepared by mixing PAE, sodium alginate and a reactive sizing agent AKD; the mass ratio of each component is as follows: PAE: sodium alginate: AKD =1:1: 1; the solid content of the PAE is 12.5%, the viscosity of the PAE is 30.3mPa.s, the pH value of the PAE is 4.4, and the density of the PAE is 1.15 g/mL; the viscosity of the sodium alginate is 350 mPa.s; the preparation method of the AKD emulsion stabilized by the PAE and sodium alginate combined synergist specifically comprises the following steps:
1) dissolving sodium alginate in a proper amount of water, and uniformly dispersing the sodium alginate by magnetic stirring, wherein the dissolving concentration of the sodium alginate is 0.005 g/mL;
2) dissolving PAE in a proper amount of water at room temperature, magnetically stirring for 10 minutes, and uniformly dispersing, wherein the dissolving concentration of the PAE is 1 wt%;
3) and (3) dispersing the AKD wax sheet in a water bath, melting and heating, then adding the sodium alginate prepared in the step (1) and the step (2) and PAE together, and shearing and stirring at a high speed to prepare AKD emulsion, wherein the shearing and stirring speed of AKD is 10000r/min, and the stirring time is 3 minutes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010501842.0A CN111576087B (en) | 2020-06-04 | 2020-06-04 | AKD emulsion stabilized by PAE and sodium alginate combined synergist and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010501842.0A CN111576087B (en) | 2020-06-04 | 2020-06-04 | AKD emulsion stabilized by PAE and sodium alginate combined synergist and preparation method thereof |
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| CN111576087A CN111576087A (en) | 2020-08-25 |
| CN111576087B true CN111576087B (en) | 2022-04-12 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300309A (en) * | 1998-05-12 | 2001-06-20 | 赫尔克里士公司 | Aqueous systems comprising and ionic polymer and a viscosity promoter and use thereof |
| CN103790070A (en) * | 2013-12-23 | 2014-05-14 | 齐鲁工业大学 | AKD emulsion sizing agent stabilized by cooperation of modified hectorite and sodium alga acid and preparation method thereof |
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2020
- 2020-06-04 CN CN202010501842.0A patent/CN111576087B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300309A (en) * | 1998-05-12 | 2001-06-20 | 赫尔克里士公司 | Aqueous systems comprising and ionic polymer and a viscosity promoter and use thereof |
| CN103790070A (en) * | 2013-12-23 | 2014-05-14 | 齐鲁工业大学 | AKD emulsion sizing agent stabilized by cooperation of modified hectorite and sodium alga acid and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 高分子基AKD乳液的制备和作用机理;费贵强;《中国造纸》;20080615(第6期);第30-33页 * |
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