CN114808523B - Silver paperboard and preparation method thereof - Google Patents
Silver paperboard and preparation method thereof Download PDFInfo
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- CN114808523B CN114808523B CN202210437456.9A CN202210437456A CN114808523B CN 114808523 B CN114808523 B CN 114808523B CN 202210437456 A CN202210437456 A CN 202210437456A CN 114808523 B CN114808523 B CN 114808523B
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- silver
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- silicon dioxide
- base paper
- nano silicon
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 239000004332 silver Substances 0.000 title claims abstract description 99
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 99
- 239000011087 paperboard Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 108
- 239000000123 paper Substances 0.000 claims abstract description 62
- 239000002994 raw material Substances 0.000 claims abstract description 40
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 40
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 37
- 239000000839 emulsion Substances 0.000 claims abstract description 29
- 238000001035 drying Methods 0.000 claims abstract description 17
- 239000011122 softwood Substances 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 239000011121 hardwood Substances 0.000 claims abstract description 16
- 229920002635 polyurethane Polymers 0.000 claims abstract description 16
- 239000004814 polyurethane Substances 0.000 claims abstract description 16
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims abstract description 13
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims abstract description 13
- 235000005822 corn Nutrition 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 239000010902 straw Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000004537 pulping Methods 0.000 claims abstract description 7
- 239000011111 cardboard Substances 0.000 claims description 54
- -1 polydimethylsiloxane Polymers 0.000 claims description 24
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 23
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 21
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 18
- 239000004530 micro-emulsion Substances 0.000 claims description 12
- 239000012188 paraffin wax Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 241000209149 Zea Species 0.000 claims 2
- 240000008042 Zea mays Species 0.000 abstract description 11
- 230000002195 synergetic effect Effects 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 61
- 239000000377 silicon dioxide Substances 0.000 description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 238000010521 absorption reaction Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 230000035515 penetration Effects 0.000 description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- DAFHKNAQFPVRKR-UHFFFAOYSA-N (3-hydroxy-2,2,4-trimethylpentyl) 2-methylpropanoate Chemical group CC(C)C(O)C(C)(C)COC(=O)C(C)C DAFHKNAQFPVRKR-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- LQZZUXJYWNFBMV-UHFFFAOYSA-N ethyl butylhexanol Natural products CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000003075 superhydrophobic effect Effects 0.000 description 1
- 239000000606 toothpaste Substances 0.000 description 1
- 229940034610 toothpaste Drugs 0.000 description 1
- 238000010023 transfer printing Methods 0.000 description 1
- PYJJCSYBSYXGQQ-UHFFFAOYSA-N trichloro(octadecyl)silane Chemical compound CCCCCCCCCCCCCCCCCC[Si](Cl)(Cl)Cl PYJJCSYBSYXGQQ-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004078 waterproofing 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
-
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- 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
- D21H21/06—Paper forming aids
-
- 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
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The application relates to the technical field of paper processing, and particularly discloses a silver paperboard and a preparation method thereof. The silver card paper comprises a waterproof layer, a base paper layer, a bonding layer and an aluminizer from bottom to top in sequence, wherein the waterproof layer comprises the following raw materials in parts by weight: 60-90 parts of waterborne polyurethane emulsion, 15-30 parts of modified nano silicon dioxide and 2-8 parts of film-forming assistant; the preparation method comprises the following steps: mixing softwood pulp, hardwood pulp and corn straw, pulping and papermaking to obtain a base paper layer; adding the modified nano silicon dioxide and the film-forming assistant into the waterborne polyurethane emulsion, uniformly mixing to obtain a mixture, uniformly coating the mixture below the base paper layer, and drying to obtain a waterproof layer; and uniformly coating VAE emulsion on one surface of the base paper layer far away from the waterproof layer, aligning and attaching the aluminizer and the base paper layer, drying, and cooling to obtain the silver paperboard. The silver paperboard has the advantage of improving the waterproof and moisture-proof performance of the silver paperboard through the synergistic effect between the raw materials.
Description
Technical Field
The application relates to the technical field of paper processing, in particular to a silver paperboard and a preparation method thereof.
Background
The cardboard is generally a paper having a weight of about 120 g or more per square meter, and is used for postcards, cards, slip sheets of picture books, etc., and the paper surface is fine and smooth, strong and wear-resistant, and has various characteristics depending on the application, for example, it is necessary that the beige silver cardboard has appropriate flexibility, etc.
The silver card paper is one kind of card paper, and is produced through painting adhesive layer on the surface of paper via transfer printing technology and transferring aluminized film or specific pattern onto printed paper via roller. The silver card paper is widely applied to color printing packaging, and is suitable for the industries of wine, cosmetics, toothpaste boxes, medicine, gift packaging and the like.
At present, silver card paper is mostly used for packing articles, and the integrity of the packed articles needs to be ensured, but when the silver card paper meets water or is in a humid environment, the packed articles are easily affected with damp, and the use of the articles is affected.
Disclosure of Invention
In order to improve the waterproof and moistureproof performance of the silver paperboard, the application provides the silver paperboard and the preparation method thereof.
In a first aspect, the present application provides a silver cardboard, which adopts the following technical scheme:
the utility model provides a silver card paper, silver card paper is by supreme waterproof layer, base paper layer, tie coat, aluminizer of including in proper order down, the waterproof layer includes the raw materials of following parts by weight: 60-90 parts of waterborne polyurethane emulsion, 15-30 parts of modified nano silicon dioxide and 2-8 parts of film-forming assistant; the modified nano silicon dioxide is prepared by modifying nano silicon dioxide of the modified nano silicon dioxide by adopting polydimethylsiloxane.
By adopting the technical scheme, the silver paperboard keeps good stiffness through the synergistic effect among the raw materials, can reduce the water absorption capacity of the silver paperboard and improve the waterproof and moistureproof performance of the silver paperboard, wherein the water absorption capacity is 0.43-0.93g/m 2 The penetration time is 15-42min, and the stiffness is 5.37-5.56mN.m.
Silver-plated paper includes base paper layer, the waterproof layer of coating on base paper layer, and the coating is in base paper layer and keeps away from tie coat, the aluminizer of adhesion on the tie coat of waterproof layer one side, through the setting of waterproof layer, can improve silver-plated paper's dampproofing and waterproofing nature. The water-based polyurethane emulsion has the waterproof and moistureproof effects, can improve the waterproof and moistureproof performance of the silver paperboard when applied to the raw materials of the waterproof layer, and facilitates better film formation of the waterproof layer on the silver paperboard by the aid of the film forming assistant.
The nanometer silicon dioxide is modified by utilizing polydimethylsiloxane, the nanometer silicon dioxide has higher specific surface energy and a self-aggregation function, and when a large number of nanometer silicon dioxide particles are aggregated, a rough surface can be generated to play a role in water resistance and moisture resistance; the polydimethylsiloxane has the waterproof and moistureproof effects, and the polydimethylsiloxane is used for modifying the nano silicon dioxide, so that a plurality of hydroxyl groups on the nano silicon dioxide can be consumed, and the nano silicon dioxide has super-hydrophobicity, thereby endowing the waterproof layer with the waterproof and moistureproof characteristics, and improving the waterproof and moistureproof performances of the silver paperboard.
Preferably, the method comprises the following steps: the waterproof layer comprises the following raw materials in parts by weight: 70-85 parts of aqueous polyurethane emulsion, 18-25 parts of modified nano silicon dioxide and 4-6 parts of film-forming assistant.
By adopting the technical scheme, the mixing amounts of the waterborne polyurethane emulsion, the modified nano-silica and the film-forming additive are optimized, so that the raw materials can be better exerted, and the waterproof and moisture-proof performance of the silver paperboard can be improved.
Preferably, the method comprises the following steps: the modified nano silicon dioxide is prepared by the following method: and (2) putting the nano silicon dioxide into toluene, performing ultrasonic dispersion, adding polydimethylsiloxane, heating to 70-90 ℃, uniformly stirring, filtering, washing and drying to obtain the modified nano silicon dioxide.
Further, the modified nano-silica is prepared by the following method: putting the nano silicon dioxide into toluene, performing ultrasonic dispersion for 30-40min, adding polydimethylsiloxane, heating to 70-90 ℃, stirring for 2-4h, then filtering, washing for 3-5 times by using an ethanol solution with the mass fraction of 70-90%, and drying to obtain modified nano silicon dioxide;
wherein the addition amount of toluene in each 1g of nano silicon dioxide is 25-35mL.
By adopting the technical scheme, the modified nano-silica is prepared by the preparation method, which is beneficial to better modifying the nano-silica by polydimethylsiloxane, so that the modified nano-silica shows better hydrophobicity, and the modified nano-silica is applied to the raw materials of the waterproof layer and is beneficial to improving the waterproof and moisture-proof properties of the silver paperboard.
Preferably, the method comprises the following steps: the weight ratio of the nano silicon dioxide to the polydimethylsiloxane is 1: (0.8-1.0).
When the addition amount of the polydimethylsiloxane is too small, the modification effect on the nano silicon dioxide is poor, so that the super-hydrophobic property of the modified nano silicon dioxide is poor; when the addition amount of polydimethylsiloxane is too large, the amount of nano silicon dioxide is small, and the sufficient roughness cannot be formed, so that the waterproof and moistureproof performances are affected. By adopting the technical scheme, when the weight ratio of the polydimethylsiloxane to the nano-silica is in the range, a rough surface can be formed, the polydimethylsiloxane can be used for better modifying the nano-silica, the super-hydrophobicity is improved, and the waterproof and moistureproof performance of the silver paperboard is improved.
Preferably, the method comprises the following steps: the waterproof layer also comprises 8-12 parts of paraffin microemulsion.
By adopting the technical scheme, the paraffin microemulsion can reduce the hygroscopicity of paper, has a fine particle size, can permeate among raw materials of the waterproof layer, and improves the compactness of the waterproof layer after drying, so that the waterproof and moistureproof effects are further enhanced, and the waterproof and moistureproof performance of the silver paperboard is improved.
Preferably, the method comprises the following steps: the base paper layer comprises the following raw materials in parts by weight: 20-40 parts of softwood pulp, 30-45 parts of hardwood pulp and 20-30 parts of corn straw.
By adopting the technical scheme, the softwood pulp is prepared by taking the softwood trees as raw materials, the softwood pulp fibers are long and thin, and the prepared paper has good flexibility and high folding resistance; hardwood pulp is made from hardwood trees as raw materials, and has coarse and short fibers, and the made paper has good stiffness and good packaging performance. Through compounding of the softwood pulp and the hardwood pulp, the prepared base paper layer has excellent flexibility and stiffness. The corn straw is applied to the raw material of the base paper layer, so that part of softwood pulp and hardwood pulp can be replaced, the cost is saved, the waste utilization is realized, the resources are saved, the environment is protected, the content of crude fibers in the corn straw is higher, the stiffness of the base paper layer can be improved, and the stiffness of the silver paperboard is improved.
Preferably, the method comprises the following steps: the tie layer is a VAE emulsion.
By adopting the technical scheme, the VAE emulsion has stronger bonding effect, is nontoxic and odorless, does not harm health, is an environment-friendly adhesive, has high drying speed and high bonding strength, can ensure that the aluminized film and the base paper layer are bonded more firmly, and is convenient for preparing the silver paperboard.
In a second aspect, the application provides a method for preparing a silver cardboard, which adopts the following technical scheme:
a preparation method of the silver cardboard comprises the following steps:
s1: mixing softwood pulp, hardwood pulp and corn straw, pulping and papermaking to obtain a base paper layer;
s2: adding the modified nano silicon dioxide and the film-forming assistant into the waterborne polyurethane emulsion, uniformly stirring to obtain a mixture, uniformly coating the mixture below the base paper layer, and drying to obtain a waterproof layer;
s3: and uniformly coating VAE emulsion on the surface of the base paper layer far away from the waterproof layer, aligning and attaching the aluminizer and the base paper layer, drying, and cooling to obtain the silver paperboard.
Further, the preparation method of the silver cardboard comprises the following steps:
s1: mixing softwood pulp, hardwood pulp and corn straw, stirring for 10-20min, pulping for 1-2h, and then pulping and making paper to obtain a base paper layer;
s2: adding the modified nano silicon dioxide and the film-forming assistant into the waterborne polyurethane emulsion, stirring for 40-50min to obtain a mixture, uniformly coating the mixture below the base paper layer, drying for 2-3h at 110-130 ℃, and cooling to 22 +/-4 ℃ to obtain a waterproof layer;
s3: uniformly coating VAE emulsion on the surface of the base paper layer far away from the waterproof layer, aligning and attaching the aluminizer and the base paper layer, drying at 80-90 ℃ for 20-40min, and cooling to 22 +/-4 ℃ to obtain the silver paperboard.
Preferably, the method comprises the following steps: the amount of the mixture applied in step S2 is 40 to 60g/m 2 The coating amount of the VAE emulsion in the step S3 is 12-20g/m 2 。
By adopting the technical scheme, the silver paperboard is prepared by the preparation method, the raw materials of the base paper layer are uniformly mixed and prepared, the waterproof layer is prepared, the raw materials can be better exerted, then the waterproof layer, the bonding layer and the aluminum-plated film are sequentially coated, the raw materials of the waterproof layer can be more uniformly mixed, and the waterproof and moisture-proof performance of the silver paperboard can be improved conveniently through the synergistic effect of the raw materials of the waterproof layer.
Preferably, the method comprises the following steps: when the film-forming assistant is added into the aqueous polyurethane emulsion, the paraffin microemulsion is added together.
By adopting the technical scheme, the waterproof and moistureproof performance of the waterproof layer can be further improved by adding the paraffin microemulsion, so that the waterproof and moistureproof performance of the silver paperboard is improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. because modified nano-silica is adopted in the application, a rough surface can be formed due to the aggregation effect of particles, the waterproof and moistureproof effects are facilitated, the nano-silica is modified by utilizing polydimethylsiloxane, hydroxyl on the nano-silica can be consumed, the nano-silica has super-hydrophobicity, the waterproof and moistureproof performance is further improved, and the water absorption capacity can reach 0.43g/m 2 The penetration time reaches 42min, and the stiffness reaches 5.56mN.m.
2. The paraffin microemulsion is preferably selected in the application, the paraffin microemulsion not only can reduce the moisture absorption of paper, but also can be dispersed in gaps among raw materials of the waterproof layer, the compactness of the waterproof layer is enhanced, and therefore the waterproof and moistureproof performance of the silver paperboard is further improved.
Detailed Description
The present application is described in further detail below with reference to specific contents.
Starting materials
The viscosity of the aqueous polyurethane emulsion is 1500-2000, the glass transition temperature is-20 ℃, the total solid content is 48 +/-1 percent, and the pH value is 7-9; the nano silicon dioxide is CW-SiO 2 -2001, average particle diameter of 20nm, specific surface area of 80m 2 G, bulk density of 0.23g/cm 3 (ii) a The CAS number of the polydimethylsiloxane is 9006-65-9, the melting point is-35 ℃, the density is 1g/mL, and the viscosity is 25ccp; the film-forming assistant is dodecyl alcohol ester, and the type is TEXANOL; the CAS number of the paraffin microemulsion is 62, the solid content is 30 +/-2 percent, and the pH value is 6-8; the whiteness of the softwood pulp is 60, and the fiber length is 2.3mm; the whiteness of the hardwood pulp is 86, the product number is YKDHFL, and the fiber length is 2.5mm; the average length of the corn straws is 2.5mm; the UV gloss oil is PP-09; the VAE emulsion is 707 emulsion and is industrial grade; the thickness of the aluminum plating film was 1mm.
Preparation example
Preparation example 1
A modified nano-silica is prepared by the following method:
and (2) putting 10kg of nano silicon dioxide into 0.3L of toluene, performing ultrasonic dispersion for 35min, adding 8kg of polydimethylsiloxane, heating to 80 ℃, stirring for 3h, then filtering, washing the solid with an ethanol solution with the mass fraction of 80% for 4 times, and drying to obtain the modified nano silicon dioxide.
Preparation example 2
A modified nanosilica differing from preparation example 1 in the amount of polydimethylsiloxane added, and preparation example 2 in which the amount of polydimethylsiloxane added was 9kg.
Preparation example 3
A modified nanosilica differing from preparation example 1 in the amount of polydimethylsiloxane added, and preparation example 3 in which the amount of polydimethylsiloxane added was 10kg.
Examples
Example 1
The raw material ratio of the silver card paper is shown in table 1.
A silver cardboard, which is prepared by the following method:
s1: mixing softwood pulp, hardwood pulp and corn straw, stirring for 15min, pulping for 1.5h, and then pulping and making paper to obtain a base paper layer;
s2: adding the modified nano-silica prepared in preparation example 1 and the film-forming assistant into the waterborne polyurethane emulsion, stirring for 45min to obtain a mixture, and uniformly coating the mixture below the base paper layer, wherein the coating amount of the mixture is 50g/m 2 Drying at 120 ℃ for 2.5h, and cooling to 26 ℃ to obtain a waterproof layer;
s3: uniformly coating VAE emulsion on the surface of the base paper layer far away from the waterproof layer, wherein the coating amount of the VAE emulsion is 16g/m 2 Aligning and attaching the aluminizer and the base paper layer, drying at 85 ℃ for 30min, and cooling to 26 ℃ to obtain the silver paperboard.
Examples 2 to 5
The silver cardboard is different from the silver cardboard in the raw material ratio shown in the table 1.
TABLE 1 EXAMPLES 1-5 blending amount of each raw material of silver cardboard (unit: kg)
Examples 6 to 9
A silver cardboard, which is different from the silver cardboard of example 5 in the ratio of raw materials, and the ratio of raw materials is shown in table 2.
TABLE 2 examples 6-9 silver cardboard each raw material mixing amount (unit: kg)
Example 10
A silver cardboard, which is different from the silver cardboard of example 7 in that the modified nano silica in the waterproof layer of the silver cardboard is obtained from a different source, and the modified nano silica in example 10 is prepared by using the preparation example 2.
Example 11
A silver cardboard, which is different from the silver cardboard in example 7 in that the modified nano-silica in the waterproof layer of the silver cardboard is obtained from a different source, and the modified nano-silica in example 11 is obtained by using preparation example 3.
Examples 12 to 14
The silver cardboard is different from the silver cardboard in example 10 in that the raw material of the waterproof layer of the silver cardboard also comprises paraffin microemulsion, and the raw material ratio is shown in table 3.
TABLE 3 blending amounts (unit: kg) of respective raw materials of silver cardboards of examples 12 to 14
Comparative example
Comparative example 1
The silver cardboard is different from the silver cardboard in the embodiment 1 in that the raw material of the waterproof layer of the silver cardboard is equivalently replaced by the nano-silica for the modified nano-silica.
Comparative example 2
The silver cardboard is characterized in that the modified nano silica in the raw materials of the waterproof layer of the silver cardboard is prepared by the following method:
putting 10kg of nano silicon dioxide into 0.3L of toluene, carrying out ultrasonic dispersion for 35min, adding 9kg of octadecyl trichlorosilane, heating to 80 ℃, stirring for 3h, then filtering, washing the solid with an ethanol solution with the mass fraction of 80% for 4 times, and drying to obtain the modified nano silicon dioxide.
Comparative example 3
The silver cardboard is different from the silver cardboard in the embodiment 1 in that modified nano silicon dioxide is not added in the raw material of the waterproof layer of the silver cardboard.
Comparative example 4
A silver cardboard, which is different from the silver cardboard of example 1 in that hardwood pulp is equivalently replaced by softwood pulp in the raw material of the base paper layer of the silver cardboard.
Comparative example 5
A silver cardboard, which is different from the silver cardboard of example 1 in that hardwood pulp is equivalently replaced with softwood pulp in the raw material of the base paper layer of the silver cardboard.
Comparative example 6
A silver paperboard, which is different from the silver paperboard in the embodiment 1 in that corn stalks are not added in the raw material of the base paper layer of the silver paperboard.
Performance test
The silver cardboard in examples 1 to 14 and comparative examples 1 to 6 was cut into a rectangular shape of 50mm × 50mm, and the following property tests were performed: water absorption capacity: the water absorption of the silver cardboard was measured according to GB/T1540-2002 "measurement of Water absorption of paper and cardboard" Kobe method ", and the results are shown in Table 4.
Water permeability resistance: the water repellency of the silver cardboard was measured according to GB/T22897-2008 "measurement of Water repellency of paper and cardboard", and the measurement results are shown in Table 4.
Stiffness: the stiffness of the silver cardboard was measured according to GB/T22364-2008 "measurement of bending stiffness of paper and cardboard", and the results are shown in Table 4.
TABLE 4 test results
As can be seen from Table 4, the silver cardboard of the present application not only maintains good stiffness, but also reduces the water absorption of the silver cardboard, and improves the waterproof and moistureproof performances of the silver cardboard, through the synergistic effect of the raw materials, wherein the water absorption is 0.43-0.93g/m 2 The penetration time is 15-42min, and the stiffness is 5.37-5.56mN.m.
As can be seen by combining example 1 with comparative examples 1 to 3, the water absorption amount in example 1 was 0.93g/m 2 The penetration time is 15min, the stiffness is 5.37mN.m, which is superior to that of comparative examples 1-3, and shows that the modified nano-silica is more suitable for being adopted in the raw materials of the silver paperboard, and the polydimethylsiloxane is more suitable for modifying the nano-silica, so that the silver paperboard can keep good stiffness, and the waterproof and moistureproof performances of the silver paperboard are improved.
As can be seen by combining example 1 with comparative examples 4 to 6, the water absorption capacity in example 1 was 0.93g/m 2 The penetration time is 15min, the stiffness is 5.37mN.m, which is superior to that of the comparative examples 4-6, and the fact that the raw materials of the silver cardboard adopt softwood pulp, hardwood pulp and corn straw as the base paper layer is more suitable, and the silver cardboard can keep excellent stiffness through the synergistic effect of the softwood pulp, the hardwood pulp and the corn straw.
Bonding ofAs can be seen from examples 1 to 5, the water absorption capacity in example 5 was 0.72g/m 2 The penetration time is 27min, the stiffness is 5.40mN.m, and the method is superior to other examples, which shows that the addition amount of the modified nano-silica in example 5 is more appropriate, and the waterproof and moistureproof performance of the silver paperboard can be improved.
When example 7 and examples 10 to 11 were combined, it was found that the water absorption capacity in example 10 was 0.57g/m 2 The penetration time is 34min, the stiffness is 5.56mN.m, and the method is superior to other examples, which shows that the preparation of the modified nano-silica by the preparation method of the preparation example 2 is more suitable, and the waterproof and moistureproof performances of the silver paperboard can be further improved.
When example 10 and examples 12 to 14 were combined, it was found that the water absorption capacity in example 14 was 0.43g/m 2 The penetration time is 42min, the stiffness is 5.55mN.m, which is superior to other examples, and shows that the addition of the paraffin microemulsion into the raw materials of the silver paperboard waterproof layer is more suitable, and the addition amount of the paraffin microemulsion in the example 14 is more suitable, so that the waterproof and moistureproof performances of the silver paperboard can be further improved.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of the present application is not limited by the embodiments of the present application, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (6)
1. A silver card paper, characterized in that: the silver card paper sequentially comprises a waterproof layer, a base paper layer, a bonding layer and an aluminizer from bottom to top, wherein the waterproof layer comprises the following raw materials in parts by weight: 60-90 parts of aqueous polyurethane emulsion, 15-30 parts of modified nano silicon dioxide, 2-8 parts of film-forming assistant and 8-12 parts of paraffin microemulsion; the modified nano silicon dioxide is prepared by modifying nano silicon dioxide by adopting polydimethylsiloxane;
the modified nano silicon dioxide is prepared by the following method: putting the nano silicon dioxide into toluene, performing ultrasonic dispersion, adding polydimethylsiloxane, heating to 70-90 ℃, uniformly stirring, then filtering, washing and drying to obtain modified nano silicon dioxide;
the weight ratio of the nano silicon dioxide to the polydimethylsiloxane is 1: (0.8-1.0).
2. A silver cardboard according to claim 1, characterized in that: the waterproof layer comprises the following raw materials in parts by weight: 70-85 parts of aqueous polyurethane emulsion, 18-25 parts of modified nano silicon dioxide and 4-6 parts of film-forming assistant.
3. A silver cardboard according to claim 1, characterized in that: the base paper layer comprises the following raw materials in parts by weight: 20-40 parts of softwood pulp, 30-45 parts of hardwood pulp and 20-30 parts of corn straw.
4. A silver cardboard according to claim 1, characterized in that: the tie layer is a VAE emulsion.
5. A method for preparing a silver cardboard according to any of the claims 1 to 4, characterized in that it comprises the following steps:
s1: mixing softwood pulp, hardwood pulp and corn straw, pulping and papermaking to obtain a base paper layer;
s2: adding the modified nano silicon dioxide and the film forming aid into the aqueous polyurethane emulsion, adding the paraffin microemulsion into the aqueous polyurethane emulsion when the film forming aid is added into the aqueous polyurethane emulsion, uniformly stirring to obtain a mixture, uniformly coating the mixture below the base paper layer, and drying to obtain a waterproof layer;
s3: and uniformly coating VAE emulsion on the surface of the base paper layer far away from the waterproof layer, aligning and attaching the aluminizer and the base paper layer, drying, and cooling to obtain the silver paperboard.
6. The method for preparing silver cardboard according to claim 5, wherein the method comprises the following steps: the amount of the mixture applied in step S2 is 40 to 60g/m 2 The coating amount of the VAE emulsion in the step S3 is 12-20g/m 2 。
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| CN105542644B (en) * | 2015-12-16 | 2018-10-09 | 华南理工大学 | A kind of nano silicon dioxide modifying water polyurethane water-proof paint and preparation method thereof |
| CN205501724U (en) * | 2016-04-12 | 2016-08-24 | 南京恒业包装材料有限公司 | Dampproofing and waterproofing shifts card paper |
| CN106917323A (en) * | 2017-03-29 | 2017-07-04 | 合肥天沃能源科技有限公司 | A kind of cardboard waterproof finishing agent and preparation method thereof |
| US10377907B2 (en) * | 2017-11-08 | 2019-08-13 | King Fahd University Of Petroleum And Minerals | Substrate with a superhydrophobic coating and a method of fabricating thereof |
| JP7233278B2 (en) * | 2018-03-28 | 2023-03-06 | 日本製紙株式会社 | Paper barrier material |
| CN111926619A (en) * | 2020-08-06 | 2020-11-13 | 贵州金马包装材料有限公司 | Compound silver card paper of grey end plain surface radium-shine |
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