CN108330737B - Surface sizing agent for improving water resistance of paper web and preparation method thereof - Google Patents
Surface sizing agent for improving water resistance of paper web and preparation method thereof Download PDFInfo
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- CN108330737B CN108330737B CN201711489748.2A CN201711489748A CN108330737B CN 108330737 B CN108330737 B CN 108330737B CN 201711489748 A CN201711489748 A CN 201711489748A CN 108330737 B CN108330737 B CN 108330737B
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- surface sizing
- sizing agent
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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
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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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
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Abstract
The invention relates to the technical field of papermaking sizing agents, in particular to a surface sizing agent for improving the water resistance of paper webs and a preparation method thereof, wherein the surface sizing agent is an AKD emulsifier prepared by mixing 8-15 parts of glacial acetic acid, 10-15 parts of caustic soda, 50-60 parts of cassava starch and 2-10 parts of a dispersing agent under the heating condition; then adding 45-60 parts of metal sodium powder, diluting and dissolving with 75-85% of soft water, and stirring under a heating condition to prepare a homogeneous emulsion; then adding 1-5 parts of regulator and the balance of soft water; and finally, adding ice water to cool the mixed solution, and adjusting the pH value to 2-4 by using aluminum sulfate to obtain the surface sizing agent. Compared with the prior art, the surface sizing agent disclosed by the invention is homogeneous and fine, has excellent water resistance and stability, can be used for remarkably improving the water resistance of paper web, is environment-friendly in raw materials and simple in preparation process, and is suitable for industrial large-scale production.
Description
Technical Field
The invention relates to the technical field of papermaking sizing agents, in particular to a surface sizing agent for improving the water resistance of paper webs and a preparation method thereof.
Background
Surface sizing is a process in the paper or paperboard processing process, and is usually positioned at the tail end of a drying part of a paper machine, so that a layer of glue solution is sprayed when paper sheets are not completely dried but have certain strength, and a layer of glue film is formed on the surfaces of the paper and the paperboard through subsequent drying, thereby achieving the purpose of changing the surface performance of the paper or the paperboard. From the development of the paper industry, surface sizing for paper making is one of the indispensable processes by which surface additives can be added that improve the sheet properties or increase the water resistance of paper or board. Common surface sizing agents are classified into natural polymer surface sizing agents and synthetic surface sizing agents, and among them, starch is an important natural polymer surface sizing agent and paper strengthening agent. The synthesized surface sizing agent comprises polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC), Polyacrylamide (PAM) and the like, and the acrylate emulsion system which is researched and applied most widely at present introduces a hard monomer styrene and an acrylic acid functional monomer into the system. The surface sizing agent prepared by the prior art has poor water resistance, large dosage, slow drying speed and easy occurrence of the condition of moisture regain in the sizing process, thus leading to low surface strength of finished products and limiting the application range of the finished products.
Disclosure of Invention
The invention aims to provide a surface sizing agent for improving the water resistance of paper web and a preparation method thereof aiming at the defects in the prior art.
The purpose of the invention is realized by the following technical scheme:
the surface sizing agent is prepared from the following raw materials in parts by weight:
in the technical scheme, the surface sizing agent is prepared from the following raw materials in parts by weight:
in the technical scheme, the surface sizing agent is prepared from the following raw materials in parts by weight:
in the technical scheme, the AKD softener is prepared from the following raw materials in parts by weight:
8-15 parts of glacial acetic acid, 10-15 parts of caustic soda, 50-60 parts of cassava starch and 2-10 parts of a dispersing agent.
The invention also provides a preparation method of the surface sizing agent for improving the water resistance of the paper web, which comprises the following steps:
step one, uniformly mixing cassava starch, glacial acetic acid and caustic soda under a heating condition according to a ratio, adding a dispersing agent, and continuously heating and uniformly stirring to obtain an AKD emulsifier;
step two, diluting and dissolving the AKD emulsifier and the metal sodium powder obtained in the step one by using heated soft water accounting for 75-85% of the total volume according to the proportion, and continuously stirring under a heating condition to prepare a homogeneous emulsion;
step three, adding the regulator and the rest of soft water into the homogeneous emulsion obtained in the step two according to the proportion, and continuously stirring and uniformly mixing under the heating condition to obtain a mixed solution;
step four, adding ice water into the mixed solution obtained in the step three according to the proportion, continuously stirring to cool the mixed solution, and then storing for later use;
and step five, adding aluminum sulfate into the mixed solution according to the proportion under the stirring state, and adjusting the pH value to 2-4 to obtain the surface sizing agent.
In the technical scheme, in the first step, the heating temperature is 80-90 ℃.
In the technical scheme, in the second step, the AKD emulsifier and the metal sodium powder are diluted and dissolved by soft water which accounts for 75-85% of the total volume and is at the temperature of 70-80 ℃, and are continuously stirred at the heating temperature of 70-80 ℃ to prepare the homogeneous emulsion.
In the technical scheme, in the third step, the heating temperature is 70-80 ℃.
In the above technical scheme, in the fourth step, the cooling temperature is 0-25 ℃.
The invention has the beneficial effects that:
the surface sizing agent for improving the water resistance of paper webs is an AKD emulsifier prepared by mixing 8-15 parts of glacial acetic acid, 10-15 parts of caustic soda, 50-60 parts of cassava starch and 2-10 parts of a dispersing agent under a heating condition; then adding 45-60 parts of metal sodium powder, diluting and dissolving with 75-85% of soft water (30-50 parts of the total amount) in percentage by volume, and stirring under heating to prepare homogeneous emulsion; then adding 1-5 parts of regulator and the balance of soft water, and continuously stirring and uniformly mixing under a heating condition to obtain a mixed solution; and finally, adding ice water to cool the mixed solution, and adjusting the pH value to 2-4 by using aluminum sulfate to obtain the surface sizing agent. Compared with the prior art, the surface sizing agent prepared by the invention is homogeneous and fine, has excellent water resistance and stability, can obviously improve the water resistance of paper web after sizing, and has excellent water resistance after a water dripping experiment is carried out on sized paper for 2-4 h without water permeating into the paper; in addition, the surface sizing agent has the advantages of environment-friendly raw materials and simple preparation process, and is suitable for industrial large-scale production.
Detailed Description
The invention is further described with reference to the following examples.
Example 1:
the preparation method of the surface sizing agent for improving the water resistance of the paper web comprises the following steps:
step one, uniformly mixing 50 parts of cassava starch, 8 parts of glacial acetic acid and 10 parts of caustic soda under the heating condition of 80 ℃, adding 3 parts of a dispersing agent, and continuously heating and uniformly stirring to obtain an AKD emulsifying agent;
step two, taking 65 parts of AKD emulsifier prepared in the step one and 55 parts of metal sodium powder, diluting and dissolving 30 parts of soft water at 70 ℃, and continuously stirring under the heating condition of 70 ℃ to prepare homogeneous emulsion;
step three, adding 2 parts of regulator and 10 parts of soft water into the homogenized emulsion obtained in the step two, and continuously stirring and uniformly mixing under the heating condition of 70 ℃ to obtain a mixed solution;
step four, adding 300 parts of ice water into the mixed solution obtained in the step three, continuously stirring to cool the mixed solution to 20 ℃, and then storing for later use;
and step five, adding 10 parts of aluminum sulfate into the mixed solution under the stirring state, and adjusting the pH value to 2 to obtain the surface sizing agent.
Example 2:
the preparation method of the surface sizing agent for improving the water resistance of the paper web comprises the following steps:
step one, uniformly mixing 55 parts of cassava starch, 12 parts of glacial acetic acid and 15 parts of caustic soda under the heating condition of 85 ℃, adding 5 parts of dispersing agent, continuously heating and uniformly stirring to obtain an AKD emulsifier;
step two, taking 55 parts of the AKD emulsifier prepared in the step one and 45 parts of metal sodium powder, diluting and dissolving by 36 parts of soft water at 75 ℃, and continuously stirring under the heating condition of 75 ℃ to prepare homogeneous emulsion;
step three, adding 1.5 parts of regulator and 9 parts of soft water into the homogenized emulsion obtained in the step two, and continuously stirring and uniformly mixing under the heating condition of 75 ℃ to obtain a mixed solution;
step four, adding 250 parts of ice water into the mixed solution obtained in the step three, continuously stirring to cool the mixed solution to 15 ℃, and then storing for later use;
and step five, adding 8 parts of aluminum sulfate into the mixed solution under the stirring state, and adjusting the pH value to 4 to obtain the surface sizing agent.
Example 3:
the preparation method of the surface sizing agent for improving the water resistance of the paper web comprises the following steps:
step one, uniformly mixing 60 parts of cassava starch, 15 parts of glacial acetic acid and 13 parts of caustic soda under the heating condition of 90 ℃, adding 8 parts of dispersing agent, continuously heating and uniformly stirring to obtain an AKD emulsifier;
step two, taking 70 parts of the AKD emulsifier prepared in the step one and 60 parts of metal sodium powder, diluting and dissolving 40 parts of soft water at 80 ℃, and continuously stirring under the heating condition of 80 ℃ to prepare homogeneous emulsion;
step three, adding 3 parts of regulator and 10 parts of soft water into the homogenized emulsion obtained in the step two, and continuously stirring and uniformly mixing under the heating condition of 80 ℃ to obtain a mixed solution;
step four, adding 350 parts of ice water into the mixed solution obtained in the step three, continuously stirring to cool the mixed solution to 10 ℃, and then storing for later use;
and step five, adding 15 parts of aluminum sulfate into the mixed solution under the stirring state, and adjusting the pH value to 3 to obtain the surface sizing agent.
Example 4:
the preparation method of the surface sizing agent for improving the water resistance of the paper web comprises the following steps:
step one, uniformly mixing 52 parts of cassava starch, 10 parts of glacial acetic acid and 13 parts of caustic soda under the heating condition of 85 ℃, adding 2 parts of a dispersing agent, and continuously heating and uniformly stirring to obtain an AKD emulsifying agent;
step two, taking 60 parts of the AKD emulsifier prepared in the step one and 50 parts of metal sodium powder, diluting and dissolving 26 parts of soft water at 80 ℃, and continuously stirring under the heating condition of 80 ℃ to prepare homogeneous emulsion;
step three, adding 1 part of regulator and 4 parts of soft water into the homogenized emulsion obtained in the step two, and continuously stirring and uniformly mixing under the heating condition of 80 ℃ to obtain a mixed solution;
step four, adding 320 parts of ice water into the mixed solution obtained in the step three, continuously stirring to cool the mixed solution to 20 ℃, and then storing for later use;
and step five, adding 12 parts of aluminum sulfate into the mixed solution under the stirring state, and adjusting the pH value to 2 to obtain the surface sizing agent.
The surface sizing agent that this embodiment 1 to 4 made is homogeneous exquisite, has excellent water resistance and stability concurrently, after the glueing, can show the water resistance of improving the paper web, carries out the experiment of dripping on the paper after the glueing, and no water infiltration paper 2 ~ 4h, water resistance is excellent. The surface sizing agent has the advantages of environment-friendly raw materials and simple preparation process, and is suitable for industrial large-scale production.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the true spirit and scope of the present invention.
Claims (6)
1. A preparation method of a surface sizing agent for improving the water resistance of paper web is characterized by comprising the following steps: the surface sizing agent is prepared from the following raw materials in parts by weight:
the AKD emulsifier is prepared from the following raw materials in parts by weight: 8-15 parts of glacial acetic acid, 10-15 parts of caustic soda, 50-60 parts of cassava starch and 2-10 parts of a dispersing agent;
the preparation method of the surface sizing agent comprises the following steps:
step one, uniformly mixing cassava starch, glacial acetic acid and caustic soda under a heating condition according to a ratio, adding a dispersing agent, and continuously heating and uniformly stirring to obtain an AKD emulsifier;
step two, diluting and dissolving the AKD emulsifier and the metal sodium powder obtained in the step one by using heated soft water accounting for 75-85% of the total volume according to the proportion, and continuously stirring under a heating condition to prepare a homogeneous emulsion;
step three, adding the regulator and the rest of soft water into the homogeneous emulsion obtained in the step two according to the proportion, and continuously stirring and uniformly mixing under the heating condition to obtain a mixed solution;
step four, adding ice water into the mixed solution obtained in the step three according to the proportion, continuously stirring to cool the mixed solution, and then storing for later use;
and step five, adding aluminum sulfate into the mixed solution according to the proportion under the stirring state, and adjusting the pH value to 2-4 to obtain the surface sizing agent.
2. A method of preparing a surface sizing agent for improving the water resistance of a paper web according to claim 1, characterized in that: the surface sizing agent is prepared from the following raw materials in parts by weight:
3. a method of preparing a surface sizing agent for improving the water resistance of a paper web according to claim 1, characterized in that: in the first step, the heating temperature is 80-90 ℃.
4. A method of preparing a surface sizing agent for improving the water resistance of a paper web according to claim 1, characterized in that: and in the second step, diluting and dissolving the AKD emulsifier and the metal sodium powder by soft water which accounts for 75-85% of the total volume percentage and is at the temperature of 70-80 ℃, and continuously stirring the mixture at the heating temperature of 70-80 ℃ to prepare homogeneous emulsion.
5. A method of preparing a surface sizing agent for improving the water resistance of a paper web according to claim 1, characterized in that: in the third step, the heating temperature is 70-80 ℃.
6. A method of preparing a surface sizing agent for improving the water resistance of a paper web according to claim 1, characterized in that: in the fourth step, the cooling temperature is 0-25 ℃.
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| CN201711489748.2A CN108330737B (en) | 2017-12-30 | 2017-12-30 | Surface sizing agent for improving water resistance of paper web and preparation method thereof |
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| CN108330737B true CN108330737B (en) | 2021-04-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705638A (en) * | 2009-10-27 | 2010-05-12 | 衡阳潇峰实业有限公司 | Cationic surface sizing agent and preparation method thereof |
| CN101806019A (en) * | 2010-04-01 | 2010-08-18 | 宁夏茂弘浆纸化学品有限公司 | Surface sizing agent for papermaking and production process thereof |
| CN102337707A (en) * | 2011-09-29 | 2012-02-01 | 浙江展航生物科技有限公司 | Preparation method of modified AKD (Alkyl Ketene Dimer) neutral sizing agent |
| CN102704338A (en) * | 2012-05-08 | 2012-10-03 | 华南理工大学 | Sizing reinforcing agent and preparation process and application thereof |
| CN106400587A (en) * | 2016-11-02 | 2017-02-15 | 常州市鼎日环保科技有限公司 | Preparation method of modified starch surface sizing agent |
-
2017
- 2017-12-30 CN CN201711489748.2A patent/CN108330737B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705638A (en) * | 2009-10-27 | 2010-05-12 | 衡阳潇峰实业有限公司 | Cationic surface sizing agent and preparation method thereof |
| CN101806019A (en) * | 2010-04-01 | 2010-08-18 | 宁夏茂弘浆纸化学品有限公司 | Surface sizing agent for papermaking and production process thereof |
| CN102337707A (en) * | 2011-09-29 | 2012-02-01 | 浙江展航生物科技有限公司 | Preparation method of modified AKD (Alkyl Ketene Dimer) neutral sizing agent |
| CN102704338A (en) * | 2012-05-08 | 2012-10-03 | 华南理工大学 | Sizing reinforcing agent and preparation process and application thereof |
| CN106400587A (en) * | 2016-11-02 | 2017-02-15 | 常州市鼎日环保科技有限公司 | Preparation method of modified starch surface sizing agent |
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