CN107938429B - Preparation method of hydrophobic polystyrene coated paper substrate - Google Patents
Preparation method of hydrophobic polystyrene coated paper substrate Download PDFInfo
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- CN107938429B CN107938429B CN201711207120.9A CN201711207120A CN107938429B CN 107938429 B CN107938429 B CN 107938429B CN 201711207120 A CN201711207120 A CN 201711207120A CN 107938429 B CN107938429 B CN 107938429B
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- polystyrene
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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
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/22—Polyalkenes, e.g. polystyrene
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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
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
Abstract
A preparation method of hydrophobic polystyrene coated paper substrate comprises completely dissolving binder such as starch in deionized water at normal temperature and pressure, adding polystyrene particles, and ultrasonically dispersing to obtain uniformly dispersed coating material solution; then, uniformly loading the polystyrene material on the surface of the paper substrate by a vacuum filtration coating method; finally, melting the polystyrene loaded on the surface of the paper substrate by adopting a high-temperature baking mode and effectively embedding the polystyrene on the surface of the paper substrate; according to the method provided by the invention, the hydrophobic polystyrene coated paper substrate with the water surface tension of more than 95 degrees and the surface energy of more than 45mN/m can be prepared; the method provided by the invention has the characteristics of simple and convenient operation, good repeatability, no organic solvent, good flexibility of the prepared paper substrate, strong hydrophobicity and the like.
Description
Technical Field
The invention relates to the field of preparation of polystyrene coated paper substrates, in particular to a preparation method of a hydrophobic polystyrene coated paper substrate, and specifically relates to a method for preparing the hydrophobic polystyrene coated paper substrate by using filter paper and polystyrene as raw materials through vacuum filtration and high-temperature baking.
Technical Field
Paper substrates are widely used in many fields because of their high mechanical strength, good flexibility, low cost, and the like. Paper substrates have different surface properties depending on the application and the difference in force with liquid, and can be specifically classified into hydrophilic and hydrophobic paper substrates. For example, paper towels need to have strong water absorption properties, while the wrapper should have good water-proof properties. Therefore, controlling the interaction between the cellulose and the liquid on the surface of the paper substrate is of great significance for preparing hydrophilic and hydrophobic paper substrates for different purposes.
Polystyrene has been widely used in wastewater treatment, chromatography, solid phase extraction, optical devices, etc. nowadays due to its uniform size, large surface area, low solubility in water, etc. (chemisphere, 2016,156,326; j.sep.sci.,2016,39, 1648; ACS appl.mater.interfaces,2014,6, 12752; Langmuir,2012,28,15323), while polystyrene-coated paper substrates have also been used in oil-water separation, microextraction, packaging materials and mass spectrometry (chem.eng.j.,2013,231,414; microchem.j.,2017,133, 90; carbohydr.polym.,2013,98, 1166; anal.chem.,2017,89, 7988). Currently, as methods for preparing different types of polystyrene coated or modified paper substrates, there are adsorption methods (j.appl.polym.sci.2009,112,1653), bar coating or gravure roll coating methods (Colloids surf.b,2014,118,261), impregnation methods (carbohydr.polym.,2012,89, 269; carbohydr.polym.,2013,98, 1166; appl.surf.sci.,2013,285P, 583; chem.eng.j.,2013,231,414; microchem.j.,2017,133,90) and the like. Although the methods can prepare different types of hydrophobic polystyrene coated paper substrates, the method has the defects that the coating amount of the polystyrene is not controllable, or organic solvents or additives are required to be introduced into a preparation system, so that the development of a green and environment-friendly method for preparing the hydrophobic paper substrate with the controllable coating amount of the polystyrene is needed. Recently, a simple vacuum filtration coating method (anal. methods,2015,7,5381) has been developed, by which different types of materials (such as metal organic framework materials, metal oxides, organic polymers, carbon nanotubes, etc.) can be effectively coated on the surface of a paper substrate (Analyst,2015,140,8048; anal. methods,2016,8, 8004; anal. chem.,2016,88,7005), but a polystyrene coated paper substrate prepared by the method has poor hydrophobicity and weak powder falling phenomenon (anal. chem.,2017,89,7988) during shearing, so that a green and environment-friendly method for coating a polystyrene coated paper substrate with strong hydrophobicity and stable performance is developed, which has important practical value for the development of novel paper substrates.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a preparation method of a hydrophobic polystyrene coated paper substrate. Meanwhile, by utilizing the coating method provided by the invention, other polymer materials can be coated on the surface of the paper substrate to prepare the corresponding hydrophobic paper substrate. The method has the advantages of simple operation, good repeatability, no organic solvent, good flexibility of the prepared paper substrate, strong hydrophobicity and the like.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method of preparing a hydrophobic polystyrene coated paper substrate comprising the steps of:
firstly, preparing a binder, polystyrene and deionized water into an aqueous solution under the conditions of normal temperature and normal pressure, uniformly stirring, and then putting the aqueous solution into an ultrasonic condition to continue ultrasonic emulsification treatment to prepare a uniformly dispersed coating material solution, wherein the particle size of the polystyrene is between 0.1 and 30 mu m, the concentration of the polystyrene in the aqueous solution is between 0.1 and 10g/L, and the concentration of the binder in the aqueous solution is between 0.05 and 0.5 g/L;
secondly, loading polystyrene particles on the surface of the filter paper in a suction filtration mode, then putting the prepared paper into a fume hood for air drying, and then putting the paper between two glass plates for flattening;
and thirdly, after air drying, placing the polystyrene-loaded paper substrate in an oven, and baking for 10-100 min at the temperature of 110-250 ℃ to obtain the hydrophobic polystyrene-coated paper substrate.
The adhesive comprises soluble starch, corn starch, cassava starch, cross-linked starch, esterified starch, oxidized starch, hydroxypropyl starch and pre-gelatinized starch.
The suction filtration mode can be a vacuum filtration water pump or an air pump.
The method is different from the traditional coating method in that firstly, a hydrophilic polystyrene coated paper substrate with a uniform coating is prepared in a simple suction filtration coating mode, and then the hydrophobic polystyrene coated paper substrate is prepared by utilizing the characteristic that polystyrene is vitrified in the high-temperature baking process of 110-250 ℃; other hydrophobic coated paper substrates with polymers having a vitrifying character can also be prepared using this process.
The invention has the following advantages:
(1) the method has the advantages of simple operation: the hydrophobic polystyrene coated paper substrate can be obtained by simple suction filtration coating and high-temperature baking;
(2) the method has the advantages of good repeatability: the corresponding paper substrate can be obtained by controlling the concentration of the polystyrene aqueous solution and the baking temperature and time;
(3) the method does not contain any organic solvent: the method only adds the polystyrene into the aqueous solution and prepares the corresponding coating solution, and has the characteristics of environmental protection and the like;
(4) the paper substrate prepared by the method has good flexibility: the paper substrate prepared by the method provided by the invention has no starch phenomenon, and the bending does not affect the performance of the paper substrate;
(5) the polystyrene coated paper substrate prepared by the method has strong hydrophobicity: the paper substrate prepared by the method has surface tension to water of more than 95 degrees and surface energy of more than 45 mN/m;
(6) the method has the characteristics of simple and convenient operation, good repeatability, no organic solvent, good flexibility of the prepared paper substrate, strong hydrophobicity and the like;
drawings
Figure 1 is a comparison of the hydrophobic properties of different paper substrates: FIG. 1(A) is a commercial filter paper; FIG. 1(B) is a polystyrene-loaded paper substrate; FIG. 1(C) is a polystyrene coated paper substrate.
FIG. 2(A) is a photographic image of three polystyrene coated paper substrates prepared in series; fig. 2(B) is the surface structure of a polystyrene coated paper substrate.
Detailed Description
The present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples.
A method of preparing a hydrophobic polystyrene coated paper substrate comprising the steps of:
step one, weighing 0.005-0.05g of starch serving as a binder into a 250mL beaker at normal temperature and normal pressure, wherein the used binder can be soluble starch, corn starch, tapioca starch, cross-linked starch, esterified starch, oxidized starch, hydroxypropyl starch, pre-gelatinized starch and other types of binders, then adding 100mL of deionized water, stirring uniformly, and then heating the solution to a boiling state to completely dissolve the starch; then 0.01-1 g of polystyrene coating material is weighed in the solution, the weight of the coating material can be adjusted according to specific requirements, and after the coating material is uniformly stirred, the solution is put under the ultrasonic condition for continuous ultrasonic emulsification treatment for 5-100 min to prepare the uniformly dispersed coating material solution.
And secondly, loading the coating solution into a suction filtration device containing blank filter paper, performing suction filtration coating, wherein the suction filtration device can be a common water tank type suction filtration pump or other types of suction filtration devices, the suction filtration time can be 0.1-1 h, then putting the prepared paper into a fume hood for air drying, and then placing the paper between two glass plates for flattening.
And step three, placing the polystyrene coated paper substrate in an oven, wherein the maximum temperature of the oven is 110-250 ℃, the baking time can be 10-100 min, and naturally cooling the temperature of the oven to room temperature after baking is finished, so that the polystyrene coated paper substrate with uniform surface and strong hydrophobicity can be obtained.
Example one
Referring to fig. 1, 0.02g of crosslinked starch and 100mL of deionized water were added to a 250mL beaker at room temperature, and the mixture was stirred uniformly with a glass rod; then placing the starch in a heating sleeve for heating treatment, and continuously stirring in the heating process to fully dissolve the starch; after the starch is completely dissolved, taking out the beaker from the heating device, cooling to room temperature, adding 0.6g of self-made polystyrene microspheres with the particle size of about 2.0 microns, uniformly stirring, and then putting the mixture into an ultrasonic emulsification device for ultrasonic treatment for 15min to prepare a uniform coating solution; adding the solution into a device containing blank filter paper for suction filtration coating, taking down the coated paper after the solution in the suction filtration device is dried, hanging the coated paper in a fume hood for air drying, and finally placing the coated paper between two glass plates for flattening to obtain the coated paper; then placing the polystyrene-loaded paper substrate in an oven for baking, and baking for 40min at 170 ℃ to obtain the paper which is the polystyrene-coated paper substrate.
FIG. 1 shows the comparison of the hydrophobic properties of the polystyrene coated paper substrate prepared by the method of the present invention with commercial filter paper and polystyrene loaded paper substrates. It can be seen that the paper substrate directly loaded by polystyrene has almost no hydrophobic property, which is equivalent to the hydrophobicity of commercial filter paper, while the polystyrene coated paper substrate prepared by the method provided by the invention has stronger hydrophobic property, and the contact angle of water on the surface of paper is about 95 degrees.
Fig. 2(a) shows that three polystyrene-coated paper substrates were continuously prepared by the method of the present invention, and it can be seen that the polystyrene-coated paper substrates prepared by the method of the present invention have good repeatability. Fig. 2(B) shows the flexibility of the paper substrate prepared by this study, and it can be seen that the prepared paper substrate has good flexibility and there is no powder falling or crack on the surface of the paper substrate during folding.
Example two
Under the condition of room temperature, adding 0.03g of soluble starch and 100mL of deionized water into a 250mL beaker, and uniformly stirring by adopting a glass rod; then placing the starch in a heating sleeve for heating treatment, and continuously stirring in the heating process to fully dissolve the starch; after the starch is completely dissolved, taking out the beaker from the heating device, cooling to room temperature, adding 0.6g of self-made polystyrene microspheres with the particle size of about 2.0 mu m, uniformly stirring, and then putting the beaker into an ultrasonic emulsification device for ultrasonic treatment for 15 min; adding the solution into a device containing blank filter paper for suction filtration coating, taking down the coated paper after the solution in the suction filtration device is dried, hanging the coated paper in a fume hood for air drying, and finally placing the coated paper between two glass plates for flattening; then placing the polystyrene-loaded paper substrate in an oven at 170 ℃ for baking for 40min to obtain the polystyrene-coated paper substrate.
EXAMPLE III
Under the condition of room temperature, adding 0.02g of soluble starch and 100mL of deionized water into a 250mL beaker, and uniformly stirring the mixture by adopting a glass rod; then placing the starch in a heating sleeve for heating treatment, and continuously stirring in the heating process to fully dissolve the starch; after the starch is completely dissolved, taking out the beaker from the heating device, cooling to room temperature, adding 0.8g of self-made polystyrene microspheres with the particle size of about 2.0 microns, uniformly stirring, and then putting the mixture into an ultrasonic emulsification device for ultrasonic treatment for 15 min; adding the solution into a device containing blank filter paper for suction filtration coating, taking off the coated paper after the solution in the suction filtration device is dried, hanging the coated paper in a fume hood for air drying, and finally placing the coated paper between two glass plates for flattening; then placing the polystyrene-loaded paper substrate in an oven at 170 ℃ for baking for 50min to obtain the polystyrene-coated paper substrate.
Example four
Under the condition of room temperature, 0.02g of corn starch and 100mL of deionized water are added into a 250mL beaker and are uniformly stirred by adopting a glass rod; then placing the starch in a heating sleeve for heating treatment, and continuously stirring in the heating process to fully dissolve the starch; after the starch is completely dissolved, taking out the beaker from the heating device, cooling to room temperature, adding 0.1g of self-made polystyrene microspheres with the particle size of about 2.0 microns, uniformly stirring, and then putting the mixture into an ultrasonic emulsification device for ultrasonic treatment for 15 min; adding the solution into a device containing blank filter paper for suction filtration coating, taking down the coated paper after the solution in the suction filtration device is dried, hanging the coated paper in a fume hood for air drying, and finally placing the coated paper between two glass plates for flattening; then placing the polystyrene-loaded paper substrate in an oven at 170 ℃ for baking for 30min to obtain the polystyrene-coated paper substrate.
EXAMPLE five
Under the condition of room temperature, adding 0.02g of soluble starch and 100mL of deionized water into a 250mL beaker, and uniformly stirring the mixture by adopting a glass rod; then placing the starch in a heating sleeve for heating treatment, and continuously stirring in the heating process to fully dissolve the starch; after the starch is completely dissolved, taking out the beaker from the heating device, cooling to room temperature, adding 0.8g of self-made polystyrene microspheres with the particle size of about 2.0 microns, uniformly stirring, and then putting the mixture into an ultrasonic emulsification device for ultrasonic treatment for 15 min; adding the solution into a device containing blank filter paper for suction filtration coating, taking down the coated paper after the solution in the suction filtration device is dried, hanging the coated paper in a fume hood for air drying, and finally placing the coated paper between two glass plates for flattening; then placing the polystyrene-loaded paper substrate in an oven at 110 ℃ for baking for 45min to obtain the polystyrene-coated paper substrate.
Claims (4)
1. A preparation method of a hydrophobic polystyrene coated paper substrate is characterized by comprising the following steps:
firstly, preparing a binder, polystyrene and deionized water into an aqueous solution under the conditions of normal temperature and normal pressure, uniformly stirring, then putting into an ultrasonic condition, and continuing ultrasonic emulsification treatment to prepare a uniformly dispersed coating material solution, wherein the particle size of the polystyrene is between 0.1 and 30 mu m, the concentration of the polystyrene in the aqueous solution is between 6 and 8g/L, and the concentration of the binder in the aqueous solution is between 0.2 and 0.3 g/L;
secondly, loading polystyrene on the surface of the filter paper in a suction filtration mode, then putting the prepared paper into a fume hood for air drying, and then placing the paper between two glass plates for flattening;
and thirdly, after air drying, placing the polystyrene-loaded paper substrate in an oven, and baking for 10-100 min at the temperature of 110-250 ℃ to obtain the hydrophobic polystyrene-coated paper substrate.
2. The method of claim 1, wherein the binder is selected from the group consisting of corn starch, tapioca starch, cross-linked starch, esterified starch, oxidized starch, hydroxypropyl starch, and pregelatinized starch.
3. The method of claim 1, wherein the suction filtration is performed by a vacuum pump or an air pump.
4. The method for preparing the hydrophobic polystyrene coated paper substrate as claimed in claim 1, wherein 0.02g of cross-linked starch and 100mL of deionized water are added into a 250mL beaker at room temperature, and the mixture is stirred uniformly by a glass rod; then placing the starch in a heating sleeve for heating treatment, and continuously stirring in the heating process to fully dissolve the starch; after the starch is completely dissolved, taking out the beaker from the heating device, cooling to room temperature, adding 0.6g of polystyrene microspheres with the particle size of 2.0 mu m, uniformly stirring, and then putting the beaker into an ultrasonic emulsification device for ultrasonic treatment for 15min to prepare a uniform coating solution; adding the solution into a device containing blank filter paper for suction filtration coating, taking down the coated paper after the solution in the suction filtration device is dried, hanging the coated paper in a fume hood for air drying, and finally placing the coated paper between two glass plates for flattening; finally, placing the polystyrene-loaded paper substrate in an oven for baking, and baking for 40min at 170 ℃ to obtain the polystyrene-coated paper substrate with uniform surface and strong hydrophobicity.
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| KR102155614B1 (en) * | 2020-04-06 | 2020-09-14 | 하호 | Composition for Coating Moisture-proof or Waterproof Paper Having Excellent Strength and Paper Applied with the Same |
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