CN110939012B - Low-quantitative super-hydrophobic packaging paper and preparation method thereof - Google Patents
Low-quantitative super-hydrophobic packaging paper and preparation method thereof Download PDFInfo
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- CN110939012B CN110939012B CN201911043453.1A CN201911043453A CN110939012B CN 110939012 B CN110939012 B CN 110939012B CN 201911043453 A CN201911043453 A CN 201911043453A CN 110939012 B CN110939012 B CN 110939012B
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/02—Rolls; Their bearings
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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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/56—Rolls
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
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Abstract
The invention relates to a low-quantitative super-hydrophobic packaging paper and a preparation method thereof, wherein the packaging paper comprises packaging base paper, a hydrophobic coating, a micro-structure coating and a nano-structure coating; the hydrophobic coating is composed of a low melting point wax; the microstructure coating is comprised of a high melting point wax; the nanostructured coating is comprised of modified nanosilica. The packaging base paper is obtained by coating wax emulsion and modified silicon dioxide respectively and then calendaring by a soft roller; the mixed wax is in a micron particle state and can fully fill gaps of fibers on the surface of a paper sheet; meanwhile, the hydrophobic nano silicon dioxide particles are filled between the fibers and the micron wax to form a hydrophobic micro-nano structure, so that the hydrophobic property of paper sheets can be obviously improved, the contact angle is improved, and the rolling angle is reduced; the whole manufacturing process is simple to operate, low in energy consumption and environment-friendly, and does not relate to fluorine-containing chemicals or organic solvents. Has good application prospect.
Description
Technical Field
The invention relates to a manufacturing method of a paper packaging material, in particular to low-basis-weight super-hydrophobic packaging paper and a preparation method thereof.
Background
Paper is a common and indispensable substance in daily life, super-hydrophobic paper is a surface with a static contact angle of water of more than 150 degrees and a sliding angle of less than 10 degrees, and a plurality of super-hydrophobic phenomena exist in nature, including a plurality of plant leaf surfaces, bird feathers, insect wings and the like. The surfaces of the animals and plants are covered with hydrophobic grease and wax, and the products have the characteristics of self-cleaning, snow prevention, corrosion prevention and the like, and have great application prospects in industrial production and daily life of people.
The paper packaging industry is one of the most rapidly developing fields in the packaging industry, has a large development space, and is identified as one of the most promising green packaging materials. The main chemical components of paper are cellulose and hemicellulose, which belong to macromolecular polysaccharide, the structure of the paper is strong in hydrophilicity, and the paper is easy to absorb moisture from the surrounding environment, so that the strength of the paper board is reduced, and thus the physical strength and the chemical property stability of the paper and the paper board used as packaging materials are poor, so that a plurality of novel super-hydrophobic preparation methods are correspondingly provided, such as fluorinated nano-silica, fluorine-containing long-chain siloxane and the like can be used for paper surface coating, or free radical polymerization, and the like can be used for paper surface hydrophobic modification after plasma etching and carrying out a fluorination reaction. The means for improving the paper packaging material mainly comprises a convenient walking mode and a composite waterproof layer.
However, although the composite waterproof layer has good surface properties, once water permeates into the paper package from the joint, the material is softened, and the waterproof function is lost. And the addition of the composite layer not only has high cost, but also increases the procedures for recycling subsequent materials. The surface coating only needs to add a layer of waterproof surface layer on the surface of the common paper packaging material through coating equipment, so the process is simple. Common means comprise sizing, gloss oil coating and the like, while the sizing is performed by using rosin size, the waterproof performance of paper is limited, the coating is not uniform, the thickness is not uniform, the waterproof performance is unstable, the gloss oil coating can only partially improve the waterproof performance, and the increasingly improved waterproof requirements are difficult to meet.
Disclosure of Invention
The invention aims to provide low-quantitative super-hydrophobic packaging paper and a preparation method thereof, overcomes the defects of the prior art, and further improves the hydrophobic property and the effective waterproof period of the paper by adopting a composite coating and adding a nano-structure pattern layer.
The technical scheme adopted by the invention is as follows:
the low-quantitative super-hydrophobic packaging paper is characterized in that:
comprises packaging base paper, a hydrophobic coating, a micro-structure coating and a nano-structure coating;
the hydrophobic coating is composed of a low melting point wax;
the microstructure coating is comprised of a high melting point wax;
the nano-structure coating is composed of modified nano-silica;
the mass ratio of the hydrophobic coating to the micro-structure coating to the nano-structure coating is (6-8): 2: 1, Total coating weight 3-8g/m2。
The preparation method of the low-quantitative super-hydrophobic packaging paper is characterized by comprising the following steps of:
the method comprises the following steps:
(1) preparing a mixed wax emulsion:
firstly preparing 1.0-2.0 g/L CTAB solution, heating to 75-85 ℃, and adding into a homogenizer; performing hot-melting mixing on two or more kinds of waxes with different melting points, wherein the heating temperature is higher than the temperature of the wax with the lowest melting point and lower than the temperature of the wax with the highest melting point, and a partial solid-partial liquid state is formed; adding the hot-melt mixed wax into the homogenizer, controlling the temperature to be 75-85 ℃, the stirring speed to be 2000-year and 3000 r/min, and the stirring time to be 30-60min, stopping heating, continuing stirring for 10-20min, and the stirring speed to be 500-year and 800 r/min, forming micron-sized wax particle emulsion with the concentration of 6-10 wt%, and cooling to room temperature for later use;
(2) coating a waxy emulsion:
coating the micron-sized waxy particle emulsion obtained in the step (1) on the surface of packaging base paper in a film transfer mode, and controlling the linear pressure of a film transfer roller to be 20-35 kN/m and the quantitative rate to be 2-6 g/m2Drying at 30-60 deg.C for 10-30 min;
(3) coating modified silicon dioxide: coating the hydrophobic modified silica coating on the surface of the paper sheet in the step (2) in a roll coating mode, wherein the speed ratio of a coating roll is 1.1-1.2, the linear pressure is 10-20 kN/m, infrared drying is firstly carried out, and then drying is carried out through a steam type drying cylinder;
(4) and (3) soft roller calendering: the pressure of the calendering line is controlled to be 150 ℃ and 300kN/m, the temperature is controlled to be 75-85 ℃, and the contact time is controlled to be 15-25 s.
The wax in the step (1) is vegetable wax, mineral wax or synthetic wax, the melting point temperature of the lowest melting point wax is not higher than 70 ℃, and the melting point of the highest melting point wax is not lower than 85 ℃.
The preparation method of the hydrophobic modified silicon dioxide in the step (3) comprises the following steps:
the particle size of the silicon dioxide is 20-200nm, a 5-10 wt% solution is prepared by using 95% ethanol as a solvent, the stirring speed is controlled at 100-.
The invention has the following advantages:
the wax is vegetable wax, mineral wax or synthetic wax, and the melting point temperature of the lowest melting point wax is not higher than 70 ℃, so that the energy consumption of the subsequent processing process is reduced, and the pollution to the environment is reduced. The high-melting-point wax in the mixed wax is in a micron particle state, so that gaps among fibers on the surface of a paper sheet can be fully filled, and water molecules are prevented from permeating to damage the waterproof performance; melting the low-melting-point wax into a film under the action of hot pressing, and covering the film on the surface of the fiber to form a hydrophobic film layer; meanwhile, the hydrophobic nano silicon dioxide particles are filled between the fibers and the micron wax to form a hydrophobic micro-nano structure, so that the coating and the fibers are combined more tightly without losing the hydrophobic property. And finally, the whole coating is uniformly covered by the soft roller press polishing, the operation can be finished under the condition of low energy consumption, the whole process is simple to operate, a hydrophobing agent is not added, other performances of paper packaging are not influenced, and the hydrophobing performance of the paper material is obviously improved.
Drawings
FIG. 1 is a microscopic view of a wrapping paper prepared according to the present invention.
Detailed Description
The present invention will be described in detail with reference to specific embodiments.
The invention relates to low-quantitative super-hydrophobic packaging paper which comprises packaging base paper, a hydrophobic coating, a micro-structure coating and a nano-structure coating; the hydrophobic coating is composed of a low melting point wax; the microstructure coating is comprised of a high melting point wax; the nanostructured coating is comprised of modified nanosilica. The mass ratio of the hydrophobic coating to the micro-structure coating to the nano-structure coating is (6-8): 2: 1, Total coating weight 3-8g/m2。
The preparation method of the low-basis-weight super-hydrophobic packaging paper comprises the following steps:
(1) preparing a mixed wax emulsion:
firstly preparing 1.0-2.0 g/L CTAB (cetyl trimethyl ammonium bromide) solution, heating to 75-85 ℃, and adding into a homogenizer; performing hot-melting mixing on two or more kinds of waxes with different melting points, wherein the heating temperature is higher than the temperature of the wax with the lowest melting point and lower than the temperature of the wax with the highest melting point, and a partial solid-partial liquid state is formed; adding the hot-melt mixed wax into the homogenizer, controlling the temperature to be 75-85 ℃, the stirring speed to be 2000-year and 3000 r/min, and the stirring time to be 30-60min, stopping heating, continuing stirring for 10-20min, and the stirring speed to be 500-year and 800 r/min, forming micron-sized wax particle emulsion with the concentration of 6-10 wt%, and cooling to room temperature for later use;
(2) coating a waxy emulsion:
coating the micron-sized waxy particle emulsion obtained in the step (1) on the surface of packaging base paper in a film transfer mode, and controlling the linear pressure of a film transfer roller to be 20-35 kN/m and the quantitative rate to be 2-6 g/m2Drying at 30-60 deg.C for 10-30 min;
(3) coating modified silicon dioxide: coating the hydrophobic modified silica coating on the surface of the paper sheet in the step (2) in a roll coating mode, wherein the speed ratio of a coating roll is 1.1-1.2, the linear pressure is 10-20 kN/m, infrared drying is firstly carried out, and then drying is carried out through a steam type drying cylinder;
(4) and (3) soft roller calendering: the pressure of the calendering line is controlled to be 150 ℃ and 300kN/m, the temperature is controlled to be 75-85 ℃, and the contact time is controlled to be 15-25 s.
The wax in the step (1) is vegetable wax, mineral wax or synthetic wax, the melting point temperature of the lowest melting point wax is not higher than 70 ℃, and the melting point of the highest melting point wax is not lower than 85 ℃.
The preparation method of the hydrophobic modified silicon dioxide in the step (3) comprises the following steps:
the particle size of the silicon dioxide is 20-200nm, a 5-10 wt% solution is prepared by using 95% ethanol as a solvent, the stirring speed is controlled at 100-.
After the step (4), melting the low-melting-point wax in the micron-sized wax emulsion to form a film to form a hydrophobic coating, wherein the high-melting-point wax still exists in a granular form and is a micron-structured coating.
Example 1
A preparation method of low-basis weight super-hydrophobic packaging paper comprises the following steps:
(1) preparing a mixed wax emulsion: firstly preparing a CTAB solution of 2.0 g/L, heating to 85 ℃, and adding into a homogenizer; performing hot-melting mixing on two or more kinds of waxes with different melting points, wherein the heating temperature is higher than the temperature of the wax with the lowest melting point and lower than the temperature of the wax with the highest melting point, and a partial solid-partial liquid state is formed; adding the hot melt mixed wax into the homogenizer, controlling the temperature at 85 ℃, the stirring speed at 3000 r/min, and the stirring time at 60min, stopping heating, and continuing stirring for 20min, wherein the stirring speed is 800 r/min, forming micron-sized wax particle emulsion with the concentration of 10 wt%, and cooling to room temperature for later use.
The wax is vegetable wax, mineral wax or synthetic wax, and the melting point temperature of the lowest melting point wax is not higher than 70 ℃.
(2) Coating a waxy emulsion: coating the waxy emulsion obtained in the step (1) on the surface of paper in a film transfer mode, and controlling the linear pressure of a film transfer roller to be 35 kN/m and the quantitative rate to be 6 g/m2Drying at 60 deg.C for 30 min;
(3) coating modified silicon dioxide: coating the hydrophobic modified silica coating on the surface of the paper sheet in the step (2) in a roll coating mode, wherein the speed ratio of a coating roll is 1.2, the linear pressure is 20 kN/m, infrared drying is firstly carried out, and then drying is carried out through a steam drying cylinder;
the preparation method of the hydrophobic modified silicon dioxide comprises the following steps: the particle size of the silicon dioxide is 20-200nm, a 10 wt% solution is prepared by using 95% ethanol as a solvent, the stirring speed is controlled at 200r/min, the temperature is controlled at 50 ℃, then 6 wt% of octadecyl triethoxysilane is added, the reaction is carried out for 40min, and the mass ratio of the silicon dioxide to the octadecyl triethoxysilane is 6: 1.
(4) And (3) soft roller calendering: the calendering line pressure is controlled at 300kN/m, the temperature is controlled at 85 ℃, and the contact time is controlled at 25 s.
Example 2
(1) Preparing a mixed wax emulsion: firstly preparing 1.5 g/L CTAB solution, heating to 80 ℃, and adding into a homogenizer; performing hot-melting mixing on two or more kinds of waxes with different melting points, wherein the heating temperature is higher than the temperature of the wax with the lowest melting point and lower than the temperature of the wax with the highest melting point, and a partial solid-partial liquid state is formed; adding the hot melt mixed wax into the homogenizer, controlling the temperature at 80 ℃, the stirring speed at 2500 r/min, and the stirring time at 60min, stopping heating, continuing stirring for 20min, and the stirring speed at 650 r/min to form micron-sized wax particle emulsion with the concentration of 6 wt%, and cooling to room temperature for later use.
The wax is vegetable wax, mineral wax or synthetic wax, and the melting point temperature of the lowest melting point wax is not higher than 70 ℃.
(2) Coating a waxy emulsion: coating the waxy emulsion obtained in the step (1) on the surface of paper in a film transfer mode, and controlling the linear pressure of a film transfer roller to be 35 kN/m, wherein the quantitative amount is 6 g/m2Drying at 60 deg.C for 30 min;
(3) coating modified silicon dioxide: coating the hydrophobic modified silica coating on the surface of the paper sheet in the step (2) in a roll coating mode, wherein the speed ratio of a coating roll is 1.2, the linear pressure is 20 kN/m, infrared drying is firstly carried out, and then drying is carried out through a steam drying cylinder;
the preparation method of the hydrophobic modified silicon dioxide comprises the following steps: the particle size of the silicon dioxide is 20-200nm, a 4 wt% solution is prepared by using 95% ethanol as a solvent, the stirring speed is controlled at 150r/min, the temperature is controlled at 50 ℃, 4 wt% of octadecyl triethoxysilane is added, the reaction is carried out for 40min, and the mass ratio of the silicon dioxide to the octadecyl triethoxysilane is 8: 1.
(4) And (3) soft roller calendering: the calendering line pressure is controlled at 300kN/m, the temperature is controlled at 85 ℃, and the contact time is controlled at 25 s.
Example 3
(1) Preparing a mixed wax emulsion: firstly preparing 1 g/L CTAB solution, heating to 75 ℃, and adding into a homogenizer; performing hot-melting mixing on two or more kinds of waxes with different melting points, wherein the heating temperature is higher than the temperature of the wax with the lowest melting point and lower than the temperature of the wax with the highest melting point, and a partial solid-partial liquid state is formed; adding the hot melt mixed wax into the homogenizer, controlling the temperature at 75 ℃, the stirring speed at 2000 r/min, the stirring time at 60min, stopping heating, continuing stirring for 20min, and the stirring speed at 500 r/min to form micron-sized wax particle emulsion with the concentration of 10 wt%, and cooling to room temperature for later use.
The wax is vegetable wax, mineral wax or synthetic wax, and the melting point temperature of the lowest melting point wax is not higher than 70 ℃.
(2) Coating a waxy emulsion: coating the waxy emulsion obtained in the step (1) on the surface of paper in a film transfer mode, and controlling the linear pressure of a film transfer roller to be 35 kN/m and the quantitative rate to be 6 g/m2Drying at 60 deg.C for 20 min;
(3) coating modified silicon dioxide: coating the hydrophobic modified silica coating on the surface of the paper sheet in the step (2) in a roll coating mode, wherein the speed ratio of a coating roll is 1.2, the linear pressure is 20 kN/m, infrared drying is firstly carried out, and then drying is carried out through a steam drying cylinder;
the preparation method of the hydrophobic modified silicon dioxide comprises the following steps: the particle size of the silicon dioxide is 20-200nm, 5-10 wt% solution is prepared by using 95% ethanol as a solvent, the stirring speed is controlled at 100r/min, the temperature is controlled at 50 ℃, 2 wt% of octadecyl triethoxysilane is added, the reaction is carried out for 40min, and the mass ratio of the silicon dioxide to the octadecyl triethoxysilane is 10: 1.
(4) And (3) soft roller calendering: the calendering line pressure is controlled at 300kN/m, the temperature is controlled at 85 ℃, and the contact time is controlled at 25 s.
The wax in the step (1) is vegetable wax, mineral wax or synthetic wax, and the melting point temperature of the lowest melting point wax is not higher than 70 ℃.
The hydrophobic effect of the products of embodiments 1 to 3 is shown in the following table in comparison with the effect measured according to test method ASTM D968-05:
as can be seen from the table above, the super-hydrophobic filter paper prepared by the invention has good hydrophobic effect, the contact angles of water on the surface are all larger than 150 degrees, and the rolling angle is smaller than 10 degrees; after the super-hydrophobic filter paper prepared by the invention is tested by an ASTM D968-05 method, the contact angle of water on the surface of the filter paper can still reach more than 150 degrees, and the rolling angle is still less than 10 degrees, which indicates that the mixed wax presents a micron particle state and can fully fill gaps of paper surface fibers and the hydrophobic nano silicon dioxide particles fill a hydrophobic micro-nano structure formed between the fibers and the micron wax, and the obtained super-hydrophobic packing paper has strong hydrophobicity after being calendered.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
Claims (3)
1. The preparation method of the low-quantitative super-hydrophobic packaging paper is characterized by comprising the following steps:
the method comprises the following steps:
(1) preparing a mixed wax emulsion:
firstly preparing 1.0-2.0 g/L CTAB solution, heating to 75-85 ℃, and adding into a homogenizer; performing hot-melting mixing on two or more kinds of waxes with different melting points, wherein the heating temperature is higher than the temperature of the wax with the lowest melting point and lower than the temperature of the wax with the highest melting point, and a partial solid-partial liquid state is formed; adding the hot-melt mixed wax into the homogenizer, controlling the temperature to be 75-85 ℃, the stirring speed to be 2000-year and 3000 r/min, and the stirring time to be 30-60min, stopping heating, continuing stirring for 10-20min, and the stirring speed to be 500-year and 800 r/min, forming micron-sized wax particle emulsion with the concentration of 6-10 wt%, and cooling to room temperature for later use;
the wax is vegetable wax, mineral wax or synthetic wax, the melting point temperature of the lowest melting point wax is not higher than 70 ℃, and the melting point of the highest melting point wax is not lower than 85 ℃;
(2) coating a waxy emulsion:
coating the micron-sized waxy particle emulsion obtained in the step (1) on the surface of packaging base paper in a film transfer mode, and controlling the linear pressure of a film transfer roller to be 20-35 kN/m and the quantitative rate to be 2-6 g/m2Drying at 30-60 deg.C for 10-30 min;
(3) coating modified silicon dioxide: coating the hydrophobic modified silica coating on the surface of the paper sheet in the step (2) in a roll coating mode, wherein the speed ratio of a coating roll is 1.1-1.2, the linear pressure is 10-20 kN/m, infrared drying is firstly carried out, and then drying is carried out through a steam type drying cylinder;
(4) and (3) soft roller calendering: the pressure of the calendering line is controlled to be 150 ℃ and 300kN/m, the temperature is controlled to be 75-85 ℃, and the contact time is controlled to be 15-25 s.
2. The method for preparing low basis weight superhydrophobic wrapping paper according to claim 1, wherein:
the preparation method of the hydrophobic modified silicon dioxide in the step (3) comprises the following steps:
the particle size of the silicon dioxide is 20-200nm, a 5-10 wt% solution is prepared by using 95% ethanol as a solvent, the stirring speed is controlled at 100-.
3. The low basis weight superhydrophobic wrapper prepared by the method for preparing the low basis weight superhydrophobic wrapper according to claim 1 or 2, wherein:
comprises packaging base paper, a hydrophobic coating, a micro-structure coating and a nano-structure coating;
the hydrophobic coating is composed of a low melting point wax;
the microstructure coating is comprised of a high melting point wax;
the nano-structure coating is composed of modified nano-silica;
the mass ratio of the hydrophobic coating to the micro-structure coating to the nano-structure coating is (6-8): 2: 1, Total coating weight 3-8g/m2 。
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Citations (4)
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|---|---|---|---|---|
| CN102808357A (en) * | 2012-08-17 | 2012-12-05 | 山东交通学院 | Super-hydrophobic paper and production method thereof |
| CN103711030A (en) * | 2013-12-17 | 2014-04-09 | 华南理工大学 | Super-hydrophobic paper preparation method |
| CN105400239A (en) * | 2015-12-18 | 2016-03-16 | 北京航天赛德科技发展有限公司 | Preparation method of modified silicon dioxide obtained via super-hydrophobic modification |
| CN108277694A (en) * | 2018-01-29 | 2018-07-13 | 重庆融康彩印包装有限公司 | A kind of water resistant waxdip corrugated case production technology |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102808357A (en) * | 2012-08-17 | 2012-12-05 | 山东交通学院 | Super-hydrophobic paper and production method thereof |
| CN103711030A (en) * | 2013-12-17 | 2014-04-09 | 华南理工大学 | Super-hydrophobic paper preparation method |
| CN105400239A (en) * | 2015-12-18 | 2016-03-16 | 北京航天赛德科技发展有限公司 | Preparation method of modified silicon dioxide obtained via super-hydrophobic modification |
| CN108277694A (en) * | 2018-01-29 | 2018-07-13 | 重庆融康彩印包装有限公司 | A kind of water resistant waxdip corrugated case production technology |
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