CN116103953A - Waterproof paper and preparation method thereof - Google Patents
Waterproof paper and preparation method thereof Download PDFInfo
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- CN116103953A CN116103953A CN202211594891.9A CN202211594891A CN116103953A CN 116103953 A CN116103953 A CN 116103953A CN 202211594891 A CN202211594891 A CN 202211594891A CN 116103953 A CN116103953 A CN 116103953A
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- waterproof
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- inorganic filler
- water
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- 238000002360 preparation method Methods 0.000 title claims abstract description 35
- 239000006185 dispersion Substances 0.000 claims abstract description 50
- 238000000576 coating method Methods 0.000 claims abstract description 47
- 239000011248 coating agent Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000011256 inorganic filler Substances 0.000 claims abstract description 32
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 239000000839 emulsion Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 229920000642 polymer Polymers 0.000 claims abstract description 9
- 239000002270 dispersing agent Substances 0.000 claims abstract description 7
- 239000003973 paint Substances 0.000 claims description 17
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 16
- 239000011575 calcium Substances 0.000 claims description 16
- 229910052791 calcium Inorganic materials 0.000 claims description 16
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 16
- 239000005995 Aluminium silicate Substances 0.000 claims description 15
- 235000012211 aluminium silicate Nutrition 0.000 claims description 15
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical group [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 14
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 14
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 14
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000010345 tape casting Methods 0.000 claims description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000002174 Styrene-butadiene Substances 0.000 claims description 4
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 4
- 239000005871 repellent Substances 0.000 claims description 4
- 239000011115 styrene butadiene Substances 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims 8
- 239000004927 clay Substances 0.000 claims 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052731 fluorine Inorganic materials 0.000 abstract description 3
- 239000011737 fluorine Substances 0.000 abstract description 3
- 239000003960 organic solvent Substances 0.000 abstract description 3
- 238000004806 packaging method and process Methods 0.000 abstract description 2
- 238000007493 shaping process Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 239000002253 acid Substances 0.000 description 5
- 239000003513 alkali Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- OCKPCBLVNKHBMX-UHFFFAOYSA-N butylbenzene Chemical compound CCCCC1=CC=CC=C1 OCKPCBLVNKHBMX-UHFFFAOYSA-N 0.000 description 4
- 238000004513 sizing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002940 repellent Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004729 solvothermal method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000003075 superhydrophobic effect Effects 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- 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
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
-
- 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
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
-
- 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
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
-
- 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
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/64—Inorganic compounds
-
- 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
-
- 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
Abstract
The invention belongs to the technical field of packaging paper, and particularly relates to waterproof paper and a preparation method thereof. The preparation method comprises dispersing inorganic filler in water containing dispersant to obtain inorganic filler dispersion liquid with concentration of 5-50wt%; mixing the inorganic filler dispersion liquid, the aqueous polymer emulsion and water to prepare a waterproof coating; the waterproof coating comprises the following components in parts by weight: 10% -80% of inorganic filler dispersion liquid, 10% -40% of aqueous polymer emulsion and the balance of water; and coating the waterproof coating on the surface of paper, and drying to obtain the waterproof paper. The invention has simple process, the prepared coating is water-based, does not use organic solvent or fluorine-based component, is more environment-friendly, and the prepared waterproof paper has good waterproof property and stability.
Description
Technical Field
The invention belongs to the technical field of packaging paper, and particularly relates to waterproof paper and a preparation method thereof.
Background
Paper is one of the four remarkable inventions in ancient China, is composed of plant fibers, and plays a great role in promoting cultural development and propagation of human beings. With the advancement of technology and the rise of new composite materials, paper materials are not limited to the original writing, printing and other purposes. Various paper-based composite materials prepared by special processing are applied to various industries, such as industry, building industry, food industry, medical industry and the like. Paper products are widely used due to their low cost, renewable, readily available and biodegradable properties, and are expected to replace disposable plastic products.
However, due to the porosity and hydrophilicity of paper-based materials, there are drawbacks in that they are easily hygroscopic, not water-resistant, and the mechanical strength is severely reduced in a humid environment or after encountering water. To solve this problem, various methods have been used to improve the water repellency of paper-based materials, such as laminating, laminating and paper sizing (internal sizing or surface sizing) commonly used in industry, and in addition, methods of constructing single/multi-layer coating and chemical modification have been used to hydrophobicize paper to improve the water repellency of paper. It is well known that rough micro/nanostructures and low surface energy are two key factors in constructing superhydrophobic surfaces, which can be fabricated by solvothermal/hydrothermal methods, chemical vapor deposition, dip coating/spray coating techniques, and the like. However, their practical use is limited by some drawbacks, in particular poor mechanical and chemical stability, poor interfacial bonding force between the substrate and the modified material, and environmental pollution caused by the organic solvent or fluorine-based component used. Therefore, a preparation method of a more environment-friendly water-based waterproof coating is needed.
Disclosure of Invention
The invention aims to solve the problems, and provides waterproof paper and a preparation method thereof, which can ensure the waterproof performance, and simultaneously has the advantages of environmental protection of materials and simple process.
According to the technical proposal of the invention, the preparation method of the waterproof paper comprises the following steps,
s1: dispersing an inorganic filler in water containing a dispersant to obtain an inorganic filler dispersion having a concentration of 5 to 50 wt%;
s2: mixing the inorganic filler dispersion liquid, the aqueous polymer emulsion and water to prepare a waterproof coating; the waterproof coating comprises the following components in parts by weight: 10% -80% of inorganic filler dispersion liquid, 10% -40% of aqueous polymer emulsion and the balance of water;
s3: and coating the waterproof coating on the surface of paper, and drying to obtain the waterproof paper.
Further, the inorganic filler is selected from one or more of kaolin, light calcium and nano titanium dioxide.
Specifically, when the inorganic filler is plural, the waterproof coating material contains a dispersion of plural inorganic fillers, and the dispersion of plural inorganic fillers may be formed by mixing plural single inorganic filler dispersions or an inorganic filler dispersion prepared by mixing plural inorganic fillers.
Further, the dispersing agent is sodium hexametaphosphate, and is used for dispersing the inorganic filler in water better.
Further, the concentration of the dispersant in the inorganic filler dispersion is 1 to 5wt%.
Further, in the step S1, the inorganic filler is dispersed in the water containing the sodium hexametaphosphate by a dispersing machine, wherein the dispersing speed of the dispersing machine is 10000-20000r/min, and the dispersing time is 30-60min.
It is envisioned that other means of ultrasonic dispersion, etc., may be employed to enable uniform dispersion.
Further, the aqueous polymer emulsion is styrene-butadiene emulsion and/or acrylic emulsion.
Preferably, in the step S2, the waterproof coating material includes, in weight fraction: 40% -80% of inorganic filler dispersion liquid, 20% -40% of aqueous polymer emulsion and the balance of water.
Further, in the step S2, a single inorganic filler dispersion or two mixed inorganic filler dispersions are used; when a single inorganic filler dispersion liquid is adopted, the mass fraction of the inorganic filler dispersion liquid in the waterproof coating is 10-80%; when two inorganic filler dispersion solutions are adopted, the total mass fraction of the inorganic filler dispersion solution in the waterproof coating is 10-80%, and the mass fraction of the two inorganic filler dispersion solutions is 10-40%.
Further, in the step S3, the coating mode is a knife coating method or a roll coating method.
Further, in the step S3, the thickness of the waterproof coating is 0.03-0.07mm, and specifically, the coating thickness is achieved by adjusting the distance between the doctor blade and the paper surface.
Further, in the step S3, the drying temperature is 60-100 ℃ and the drying time is 5-10min.
In another aspect, the invention provides waterproof paper prepared by the preparation method.
Compared with the prior art, the technical scheme of the invention has the following advantages: the invention has simple process, the prepared coating is water-based, does not use organic solvent or fluorine-based component, is more environment-friendly, the formed waterproof coating has better wear resistance and acid and alkali resistance, and the prepared waterproof paper has good waterproof property and higher mechanical and chemical stability.
Detailed Description
The present invention will be further described with reference to specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the present invention and practice it.
EXAMPLE 1 preparation of Water repellent paper
S1: preparation of kaolin dispersions
Mixing 30% of kaolin, 3% of sodium hexametaphosphate and 67% of water according to mass fraction, and dispersing for 60min at the rotating speed of 10000 r/min.
S2: preparation of waterproof paint
According to mass fraction, 75% of kaolin dispersion liquid, 20% of styrene-butadiene emulsion and 5% of water are stirred uniformly by a stirrer.
S3: coating and shaping
And (3) coating waterproof paint on the surface of the paper by a knife coating method, wherein the coating thickness is 0.05mm, and drying to obtain the waterproof paper, wherein the drying temperature is 80 ℃ and the time is 7min.
EXAMPLE 2 preparation of waterproof paper
S1: preparation of light calcium Dispersion
According to mass fraction, 50% of light calcium, 5% of sodium hexametaphosphate and 45% of water are mixed, and the rotating speed of a dispersing machine is 10000r/min, and the dispersing is carried out for 60min.
S2: preparation of waterproof paint
According to mass fraction, 70% of light calcium dispersion liquid, 25% of butylbenzene emulsion and 5% of water are stirred uniformly by a stirrer.
S3: coating and shaping
The waterproof paint is coated on the surface of paper by a knife coating method, the coating thickness is 0.05mm, the drying temperature is 80 ℃, and the time is 7min.
EXAMPLE 3 preparation of Water repellent paper
S1: preparation of nano titanium dioxide dispersion
According to mass fraction, mixing 40% of nano titanium dioxide, 4% of sodium hexametaphosphate and 56% of water, and dispersing for 60min at the rotating speed of 10000 r/min.
S2: preparation of waterproof paint
According to mass fraction, 50% of nano titanium dioxide dispersion liquid, 40% of styrene-butadiene emulsion and 10% of water are stirred uniformly by a stirrer.
S3: coating and shaping
The waterproof paint is coated on the surface of paper by a knife coating method, the coating thickness is 0.05mm, the drying temperature is 80 ℃, and the time is 7min.
EXAMPLE 4 preparation of waterproof paper
S1: preparation of kaolin and light calcium Dispersion respectively
Mixing 50% of kaolin, 5% of sodium hexametaphosphate and 45% of water according to mass fraction, and dispersing for 60min at the rotating speed of 10000r/min to obtain kaolin dispersion liquid;
according to the mass fraction, 50% of light calcium, 5% of sodium hexametaphosphate and 45% of water are mixed, the rotating speed of a dispersing machine is 10000r/min, and the dispersion is carried out for 60min, so that the light calcium dispersion liquid is obtained.
S2: preparation of waterproof paint
According to mass fraction, 40% of kaolin dispersion liquid, 40% of light calcium dispersion liquid and 20% of butylbenzene emulsion are stirred uniformly by a stirrer.
S3: coating and shaping
The waterproof paint is coated on the surface of paper by a knife coating method, the coating thickness is 0.05mm, the drying temperature is 80 ℃, and the time is 7min.
EXAMPLE 5 preparation of waterproof paper
S1: preparation of kaolin dispersions
50% of kaolin, 5% of sodium hexametaphosphate and 45% of water are mixed according to mass fraction, and the rotating speed of a dispersing machine is 10000r/min, and the mixture is dispersed for 60min.
S2: preparation of waterproof paint
The dispersion of 75% kaolin, 20% acrylic emulsion and 5% water are stirred uniformly by a stirrer.
S3: coating and shaping
The waterproof paint is coated on the surface of paper by a knife coating method, the coating thickness is 0.05mm, the drying temperature is 80 ℃, and the time is 7min.
EXAMPLE 6 preparation of waterproof paper
S1: preparation of light calcium Dispersion
According to mass fraction, 45% of light calcium, 5% of sodium hexametaphosphate and 50% of water are mixed, and the rotating speed of a dispersing machine is 10000r/min, and the dispersing is carried out for 60min.
S2: preparation of waterproof paint
According to mass fraction, 70% of light calcium dispersion liquid, 20% of acrylic emulsion and 10% of water are stirred uniformly by a stirrer.
S3: coating and shaping
The waterproof paint is coated on the surface of paper by a knife coating method, the coating thickness is 0.05mm, the drying temperature is 80 ℃, and the time is 7min.
EXAMPLE 7 preparation of waterproof paper
S1: preparation of nano titanium dioxide dispersion
According to mass fraction, mixing 40% of nano titanium dioxide, 4% of sodium hexametaphosphate and 56% of water, and dispersing for 60min at the rotating speed of 10000 r/min.
S2: preparation of waterproof paint
The 50% nano titanium dioxide dispersion liquid, 40% acrylic emulsion and 10% water are stirred uniformly by a stirrer according to mass fraction.
S3: coating and shaping
The waterproof paint is coated on the surface of paper by a knife coating method, the coating thickness is 0.05mm, the drying temperature is 80 ℃, and the time is 7min.
EXAMPLE 8 preparation of waterproof paper
S1: preparation of kaolin and light calcium Dispersion respectively
Mixing 50% of kaolin, 5% of sodium hexametaphosphate and 45% of water according to mass fraction, and dispersing for 60min at the rotating speed of 10000r/min to obtain kaolin dispersion liquid;
according to the mass fraction, 50% of light calcium, 5% of sodium hexametaphosphate and 45% of water are mixed, the rotating speed of a dispersing machine is 10000r/min, and the dispersion is carried out for 60min, so that the light calcium dispersion liquid is obtained.
S2: preparation of waterproof paint
According to mass fraction, 40% of kaolin dispersion liquid, 40% of light calcium dispersion liquid and 20% of acrylic emulsion are stirred uniformly by a stirrer.
S3: coating and shaping
The waterproof paint is coated on the surface of paper by a knife coating method, the coating thickness is 0.05mm, the drying temperature is 80 ℃, and the time is 7min.
Comparative example 1 preparation of waterproof paper
S1: according to mass fraction, mixing 40% of nano titanium dioxide, 4% of sodium hexametaphosphate and 56% of water, and dispersing for 60min at the rotating speed of 10000r/min to prepare nano titanium dioxide dispersion liquid.
S2: the 20% nano titanium dioxide dispersion liquid and 80% water are stirred uniformly by a stirrer according to mass fraction. The coating method is adopted to coat the paper surface, the coating thickness is 0.05mm, the drying temperature is 80 ℃, and the time is 7min.
Analysis of results
The waterproof properties of the waterproof papers obtained in examples and comparative examples, including abrasion resistance and acid and alkali resistance, were examined, and the results are shown in table 1.
Wherein, the abrasion resistance test of the waterproof paper adopts the following operations: the weight weighing 200g was placed directly on the paper base, pushed with a constant external force at a constant speed of 3m/min (achieved with a coater), rubbed the paper surface with the weight, rubbed 30 times against the water-repellent paper, and then tested for contact angle. The acid and alkali resistance test of the waterproof paper adopts the following operation: after immersing the waterproof paper in an acidic liquid (ph=1) and an alkaline liquid (ph=13) for 5 hours, respectively, the contact angle was measured.
Table 1 waterproof properties of waterproof paper
| Contact angle/° | Contact angle after rubbing/° | Alkali-resistant contact angle/° | Acid resistance contact angle/° | |
| Example 1 | 136 | 131 | 131 | 132 |
| Example 2 | 140 | 135 | 135 | 137 |
| Example 3 | 130 | 124 | 124 | 125 |
| Example 4 | 145 | 140 | 141 | 142 |
| Example 5 | 132 | 126 | 127 | 130 |
| Example 6 | 135 | 129 | 131 | 133 |
| Example 7 | 126 | 120 | 122 | 124 |
| Example 8 | 140 | 134 | 135 | 137 |
| Comparative example 1 | / | / | / | / |
The contact angle of the comparative example was 117 °, but the water drops were soaked after a few seconds of residence on the paper, at which point the water repellency of the paper was not strong.
The result shows that the waterproof paper obtained by the invention has better waterproof property, the waterproof coating has better wear resistance and acid and alkali resistance, and the waterproof paper has higher mechanical and chemical stability; the comparative example was coated with a single nano titanium dioxide without a waterproof effect.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. A preparation method of waterproof paper is characterized by comprising the following steps,
s1: dispersing an inorganic filler in water containing a dispersant to obtain an inorganic filler dispersion having a concentration of 5 to 50 wt%;
s2: mixing the inorganic filler dispersion liquid, the aqueous polymer emulsion and water to prepare a waterproof coating; the waterproof coating comprises the following components in parts by weight: 10% -80% of inorganic filler dispersion liquid, 10% -40% of aqueous polymer emulsion and the balance of water;
s3: and coating the waterproof coating on the surface of paper, and drying to obtain the waterproof paper.
2. The method of producing a waterproof paper according to claim 1, wherein the inorganic filler is one or more selected from the group consisting of kaolin clay, light calcium and nano titanium dioxide.
3. The method for producing a waterproof paper according to claim 1, wherein the dispersant is sodium hexametaphosphate.
4. The method for producing a waterproof paper according to claim 1 or 3, wherein the concentration of the dispersant in the inorganic filler dispersion is 1 to 5% by weight.
5. The method for producing a waterproof paper according to claim 1, wherein in the step S1, the dispersing speed is 10000-20000r/min and the dispersing time is 30-60min.
6. The method for producing a waterproof paper according to claim 1, wherein the aqueous polymer emulsion is a styrene-butadiene emulsion and/or an acrylic emulsion.
7. The method for producing a waterproof paper according to claim 1, wherein in the step S3, the coating is performed by a knife coating method or a roll coating method.
8. The method for producing a waterproof paper according to claim 1 or 7, wherein the waterproof paint is applied in a thickness of 0.03 to 0.07mm in the step S3.
9. The method for producing a waterproof paper according to claim 1, wherein in the step S3, the drying temperature is 60 to 100 ℃ for 5 to 10 minutes.
10. A water-repellent paper produced by the production method according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211594891.9A CN116103953A (en) | 2022-12-13 | 2022-12-13 | Waterproof paper and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211594891.9A CN116103953A (en) | 2022-12-13 | 2022-12-13 | Waterproof paper and preparation method thereof |
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| CN116103953A true CN116103953A (en) | 2023-05-12 |
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| CN202211594891.9A Pending CN116103953A (en) | 2022-12-13 | 2022-12-13 | Waterproof paper and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105331220A (en) * | 2015-12-08 | 2016-02-17 | 上海台安实业集团有限公司 | Compound-type metal roof thermal-insulation waterproof coating and preparing method thereof |
| CN108517154A (en) * | 2018-03-16 | 2018-09-11 | 南开大学 | A kind of aqueous, floride-free super hydrophobic coating and preparation method |
| CN113527966A (en) * | 2021-07-09 | 2021-10-22 | 河北三棵树涂料有限公司 | Water-based polyurea composite modified single-component acrylic acid waterproof coating and preparation method thereof |
| CN114575185A (en) * | 2020-12-01 | 2022-06-03 | 台山市志力包装有限公司 | Preparation method of mildew-proof packaging carton |
| CN115094665A (en) * | 2022-05-27 | 2022-09-23 | 大连工业大学 | Preparation of water-based fluorine-free super-hydrophobic coating and application of water-based fluorine-free super-hydrophobic coating in aspects of paper products or non-paper products |
-
2022
- 2022-12-13 CN CN202211594891.9A patent/CN116103953A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105331220A (en) * | 2015-12-08 | 2016-02-17 | 上海台安实业集团有限公司 | Compound-type metal roof thermal-insulation waterproof coating and preparing method thereof |
| CN108517154A (en) * | 2018-03-16 | 2018-09-11 | 南开大学 | A kind of aqueous, floride-free super hydrophobic coating and preparation method |
| CN114575185A (en) * | 2020-12-01 | 2022-06-03 | 台山市志力包装有限公司 | Preparation method of mildew-proof packaging carton |
| CN113527966A (en) * | 2021-07-09 | 2021-10-22 | 河北三棵树涂料有限公司 | Water-based polyurea composite modified single-component acrylic acid waterproof coating and preparation method thereof |
| CN115094665A (en) * | 2022-05-27 | 2022-09-23 | 大连工业大学 | Preparation of water-based fluorine-free super-hydrophobic coating and application of water-based fluorine-free super-hydrophobic coating in aspects of paper products or non-paper products |
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