CN115748293A - AKD surface sizing agent and preparation method thereof - Google Patents
AKD surface sizing agent and preparation method thereof Download PDFInfo
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- CN115748293A CN115748293A CN202211438962.6A CN202211438962A CN115748293A CN 115748293 A CN115748293 A CN 115748293A CN 202211438962 A CN202211438962 A CN 202211438962A CN 115748293 A CN115748293 A CN 115748293A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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Abstract
The invention provides an AKD surface sizing agent which comprises the following components in parts by weight: 100 to 200 portions of AKD, 5 to 10 portions of sorbitan fatty acid ester, 3 to 8 portions of polyoxyethylene sorbitan fatty acid ester, 40 to 80 portions of AKD high molecular emulsifier, 20 to 50 portions of tristearin, 1 to 2 portions of stabilizer and a proper amount of water. The preparation method comprises mixing sorbitan fatty acid ester and polyoxyethylene sorbitan fatty acid ester in proportion, heating for melting, further adding AKD high molecular emulsifier and appropriate amount of water, heating and blending to obtain compound emulsifier; mixing with molten AKD and tristearin, and high-speed shearing; discharging, passing through a homogenizer, cooling, and passing through a screen to obtain the AKD surface sizing agent. The AKD type surface sizing agent adopts a specific compound emulsifier, has good stability and low cost, and can obviously improve the high water resistance of paper.
Description
Technical Field
The invention relates to the technical field of surface sizing agents, in particular to a preparation method of an AKD surface sizing agent.
Background
Sizing agents, also known as sizing agents, are an additive in papermaking. Can endow paper and paperboard with ink resistance, water resistance, emulsion resistance, corrosion resistance and the like, and can improve smoothness, strength and application period. Sizing agents can be classified into internal sizing agents and surface sizing agents. Surface sizing refers to a process in which a wet paper web is dewatered to a predetermined value by a drying section, and then an appropriate size is uniformly applied to the surface of the paper web. In modern papermaking technology, surface sizing has become the main form of paper surface sizing treatment, and the function is not limited to endowing paper with certain liquid repellency, and in some cases, the improvement of the printing performance and the surface performance of the paper is emphasized. Therefore, the preparation of the AKD sizing agent capable of improving the application performances of paper such as high water resistance and the like has important practical significance.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of the AKD surface sizing agent, which can obviously improve the application properties of paper such as high water resistance, ring crush strength, tensile strength and the like, thereby solving the technical problems in the prior art.
The invention is realized by adopting the following technical scheme:
an AKD surface sizing agent comprises the following components in parts by weight: 100 to 200 portions of AKD, 5 to 10 portions of sorbitan fatty acid ester, 3 to 8 portions of polyoxyethylene sorbitan fatty acid ester, 40 to 80 portions of AKD high molecular emulsifier, 20 to 50 portions of tristearin, 1 to 2 portions of stabilizer and a proper amount of water.
The AKD macromolecular emulsifier mainly comprises polydiallyl dimethyl ammonium chloride, such as AKD special macromolecular emulsifier of Zhang Jia Kaibao environmental protection science and technology limited company or AKD special emulsifying and sizing promoter with FA22 of Jiangsu Fuji scientific and technology limited company.
The sorbitan fatty acid ester is selected from sorbitan monopalmitate (span 40) or sorbitan monostearate (span 60).
The polyoxyethylene sorbitan fatty acid ester is selected from polyoxyethylene sorbitan monopalmitate (Tween 40) or polyoxyethylene sorbitan monostearate (Tween 60).
The stabilizer is polyvinyl alcohol. Polyvinyl alcohols having an average Degree of Polymerization (DP) of 1700 to 1800 and a molecular weight (Mn) of 84000 to 89000 are preferred. For example, polyvinyl alcohol of Shanghai Rong Euro technology Co., ltd. No. 17-88.
Wherein water is used to disperse the components, the amount of water can be easily adjusted by one skilled in the art according to the actual use requirements of the product. Preferably 500 to 1000 parts.
The AKD surface sizing agent has an average particle size of 0.6-1.2 μm and a viscosity of 20-100 mPas.
The invention further provides a preparation method of the AKD surface sizing agent, which comprises the following steps:
s1, mixing sorbitan fatty acid ester and polyoxyethylene sorbitan fatty acid ester in proportion, and heating and melting to obtain a composite nonionic emulsifier;
s2, adding an AKD high-molecular emulsifier and a proper amount of water into the composite nonionic emulsifier, and heating and blending to obtain a compound emulsifier;
s3, mixing the compound emulsifier with molten AKD and tristearin, and then shearing at a high speed;
and S4, discharging, passing through a homogenizer, cooling, and screening to obtain the AKD surface sizing agent.
Preferably, the heating and melting temperature in step S1 is 60-80 ℃.
Preferably, the shearing rotation speed in the step S3 is 1000-5000 r/min, and the temperature is kept at 60-80 ℃.
Preferably, the homogenization pressure in step S4 is 15 to 30MPa.
The AKD molecular structure adopted by the invention has a lactone ring structure, the reaction functional group and the hydroxyl on the fiber molecule are subjected to esterification reaction and firmly bonded on the fiber surface under the medium and alkaline conditions, and the hydrophobic long-chain aliphatic group is turned to the paper surface, thereby obtaining the hydrophobic effect; the compound emulsifier consisting of sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester and AKD high-molecular emulsifier is used, the stability and the sizing effect of the AKD surface sizing agent can be unexpectedly and remarkably improved, the hydrolysis and migration tendency of AKD is limited, the AKD emulsion is well protected, and meanwhile, the paper curing time can be greatly shortened; the added tristearin component can obviously improve the application performances of paper such as high water resistance, ring crush strength, tensile strength and the like when being heated and dried to form a film on paper surface.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are intended as examples only and are not intended to limit the scope of the invention, as other obvious modifications will occur to those skilled in the art. The underlying principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
The apparatus or raw materials in the present invention are not indicated by manufacturers, and are all conventional commercial apparatuses or raw materials. Wherein the AKD polymer emulsifier is AKD special polymer emulsifier of Zhang Home Kongkaibao environmental protection science and technology limited, and the polyvinyl alcohol is polyvinyl alcohol Upper part of Polyvinyl alcohol with the trade name of 17-88 of Hailong Europeania chemical engineering and technology Limited.
If not mentioned, the detection indexes related in the embodiment of the invention are all detected by adopting the conventional detection method in the field.
Example 1
1. Compounding nonionic emulsifiers: adding 5 parts of Span60 and 8 parts of Tween60 into a reaction bottle, and heating and melting at 60 ℃ for later use;
2. adding 60 parts of AKD high-molecular emulsifier, adding 400 parts of deionized water, heating to 60 ℃, and mixing with the nonionic emulsifier for later use;
3. shearing the obtained compound emulsifier with 160 parts of molten AKD and 20 parts of molten tristearin at a high speed for 20min at 60 ℃, discharging, passing through a homogenizer, cooling, and sieving to obtain AKD emulsion;
4. adding 1 part of polyvinyl alcohol into the obtained AKD emulsion to obtain the surface sizing agent; the appearance was milky white with an average particle size of 0.75. Mu.m.
Example 2
1. Compounding nonionic emulsifiers: adding 5 parts of Span40 and 3 parts of Tween60 into a reaction bottle, and heating and melting at 70 ℃ for later use;
2. adding 45 parts of AKD polymer emulsifier, adding 600 parts of deionized water, heating to 80 ℃, and mixing with the nonionic emulsifier for later use;
3. shearing the obtained compound emulsifier with 120 parts of molten AKD and 50 parts of molten tristearin at a high speed of 70 ℃ for 20min, discharging, passing through a homogenizer, cooling, and screening to obtain AKD emulsion;
4. adding 1 part of polyvinyl alcohol into the AKD emulsion to obtain the surface sizing agent; the appearance was milky white, with an average particle size of 0.8. Mu.m.
Example 3
1. Compounding nonionic emulsifiers: adding 10 parts of Span40 and 3 parts of Tween40 into a reaction bottle, and heating and melting at 80 ℃ for later use;
2. adding 80 parts of AKD high-molecular emulsifier, adding 800 parts of deionized water, heating to 60 ℃, and mixing with the nonionic emulsifier for later use;
3. shearing the obtained compound emulsifier with 200 parts of molten AKD and 50 parts of molten tristearin at a high speed of 70 ℃ for 20min, discharging, passing through a homogenizer, cooling, and screening to obtain AKD emulsion;
4. adding 2 parts of polyvinyl alcohol into the obtained AKD emulsion to obtain the surface sizing agent; the appearance was milky white with an average particle size of 0.65. Mu.m.
Example 4
1. Compounding nonionic emulsifiers: adding 5 parts of Span and 8 parts of Tween into a reaction bottle, and heating and melting at 80 ℃ for later use;
2. adding 80 parts of AKD high-molecular emulsifier, adding 800 parts of deionized water, heating to 60 ℃, and mixing with the nonionic emulsifier for later use;
3. shearing the obtained compound emulsifier with 200 parts of molten AKD and 30 parts of molten glyceryl tristearate at a high speed of 80 ℃ for 10min, discharging, passing through a homogenizer, cooling, and sieving to obtain AKD emulsion;
4. adding 2 parts of polyvinyl alcohol into the obtained AKD emulsion to obtain the surface sizing agent; the appearance was milky white with an average particle size of 0.72. Mu.m.
Comparative example 1
The same procedure as in example 3 was repeated except that the polyoxyethylene sorbitan fatty acid ester was not added and the amount thereof was made up to sorbitan fatty acid ester. The specific process comprises the following steps:
1. preparing a nonionic emulsifier: adding 13 parts of Span40 into a reaction bottle, and heating and melting at 80 ℃ for later use;
2. adding 80 parts of AKD high-molecular emulsifier, adding 800 parts of deionized water, heating to 60 ℃, and mixing with the nonionic emulsifier for later use;
3. shearing the obtained compound emulsifier with 200 parts of molten AKD and 50 parts of molten glyceryl tristearate at a high speed of 70 ℃ for 20min, discharging, passing through a homogenizer, cooling, and sieving to obtain AKD emulsion;
4. adding 2 parts of polyvinyl alcohol into the obtained AKD emulsion to obtain the surface sizing agent; the appearance was milky white with an average particle size of 0.65. Mu.m.
Comparative example 2
The same procedure as in example 3 was repeated except that no sorbitan fatty acid ester was added and the amount was made up with polyoxyethylene sorbitan fatty acid ester. The specific process comprises the following steps:
1. preparing a nonionic emulsifier: adding 13 parts of Tween40 into a reaction bottle, and heating and melting at 80 ℃ for later use;
2. adding 80 parts of AKD high-molecular emulsifier, adding 800 parts of deionized water, heating to 60 ℃, and mixing with the nonionic emulsifier for later use;
3. shearing the obtained compound emulsifier with 200 parts of molten AKD and 50 parts of molten glyceryl tristearate at a high speed of 70 ℃ for 20min, discharging, passing through a homogenizer, cooling, and sieving to obtain AKD emulsion;
4. adding 2 parts of polyvinyl alcohol into the obtained AKD emulsion to obtain the surface sizing agent; the appearance was milky white with an average particle size of 0.65. Mu.m.
Application examples
The resulting surface sizing agents of examples and comparative examples were formulated with water to give 20% solids emulsions for sizing comparative applications.
The sizing process comprises the following steps: and (3) sizing oxidized starch, stirring, heating to 90-95 ℃, keeping the temperature for gelatinization for 30min, and then adjusting to 65 ℃ for constant temperature for later use.
The sizing scheme comprises the following steps: the oxidized starch solution and the surface sizing agent are used, and the concentration of starch is 10%.
Surface sizing process: starch: AKD =20:4 (dry/wet).
The electrostatic copying paper is used as sizing base paper, the sizing materials are used, and the same sizing amount (one side is 1.7 g/m) 2 ) Respectively carrying out single-side sizing, drying the sized paper sample in an oven at the same temperature and time (140 ℃ for 120 s), and detecting the Cobb value of 60s after curing the sized paper sample for 5min, and the ring crush strength and the tensile strength.
The results of the performance measurements of the AKD surface sizing agents prepared in the examples and comparative examples are shown in table 1.
TABLE 1 index of sizing performance of the product
Wherein the Cobb value is determined: and detecting the paper sample to be detected by adopting a brix absorbency tester according to the GB/T1540-1989 method. The ring crush strength was measured according to the method specified in GB/T2679.8-2016 for the measurement of the ring crush strength of paper and board. The tensile strength was measured according to the method specified in the GB/T12914-2018 determination of paper and board tensile strength. The sample prepared according to the comparative example method has poor stability, and the sample can be layered and cannot be normally used after 90 days, and the application data is not measurable.
From the above application results, it can be seen that: after the AKD sizing agent is placed for 90 days, the Cobb, the surface strength and the ring crush strength of paper are obviously superior, namely the application performance and the stability are superior to those of a comparative example, and the result shows that the product has higher stability and better application effect under the same storage condition and the same storage period.
It will be appreciated by persons skilled in the art that the above examples are given by way of illustration only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments, and any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.
Claims (10)
1. The AKD surface sizing agent is characterized by comprising the following components in parts by weight: 100 to 200 portions of AKD, 5 to 10 portions of sorbitan fatty acid ester, 3 to 8 portions of polyoxyethylene sorbitan fatty acid ester, 40 to 80 portions of AKD high molecular emulsifier, 20 to 50 portions of tristearin, 1 to 2 portions of stabilizer and a proper amount of water.
2. The AKD surface sizing agent according to claim 1, wherein the AKD polymeric emulsifier is poly diallyldimethylammonium chloride as a main component.
3. AKD surface size according to claim 1, characterised in that the sorbitan fatty acid ester is selected from sorbitan monopalmitate or sorbitan monostearate.
4. The AKD surface sizing agent according to claim 1, characterized in that the polyoxyethylene sorbitan fatty acid ester is selected from polyoxyethylene sorbitan monopalmitate or polyoxyethylene sorbitan monostearate.
5. The AKD surface sizing agent according to claim 1, wherein the stabilizer is polyvinyl alcohol.
6. The AKD surface sizing agent according to claim 1, wherein the AKD surface sizing agent has an average particle diameter of 0.6 to 1.2 μm and a viscosity of 20 to 100 mPa-s.
7. A process for preparing an AKD surface size according to any one of claims 1 to 6, characterised in that it comprises the steps of:
s1, mixing sorbitan fatty acid ester and polyoxyethylene sorbitan fatty acid ester in proportion, and heating and melting to obtain a composite nonionic emulsifier;
s2, adding an AKD high-molecular emulsifier and a proper amount of water into the composite nonionic emulsifier, and heating and blending to obtain a compound emulsifier;
s3, mixing the compound emulsifier with molten AKD and tristearin, and then shearing at a high speed;
and S4, discharging, passing through a homogenizer, cooling, and screening to obtain the AKD surface sizing agent.
8. The method of claim 7, wherein the heating and melting temperature in step S1 is 60-80 ℃.
9. The method of claim 7, wherein the shear rate in step S3 is 1000 to 5000r/min and the temperature is maintained at 60 to 80 ℃.
10. The method of claim 7, wherein the homogenization pressure in step S4 is 15 to 30MPa.
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| CN202211438962.6A CN115748293A (en) | 2022-11-17 | 2022-11-17 | AKD surface sizing agent and preparation method thereof |
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2022
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| US20070277949A1 (en) * | 2006-06-01 | 2007-12-06 | Akzo Nobel N.V. | Sizing of paper |
| 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 |
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