A kind of waterproof glossy ink-jet recording medium
Technical field
The present invention relates to recording material for ink-jet, particularly the waterproof glossy ink-jet recording medium of high glaze, good waterproof performance, high scratch resistance, ink absorption height, inkjet printing function admirable.
Background technology
One of means that inkjet printing is exported as image were more and more accepted by the market and the common people in recent years, especially in recent years along with printer ink droplet control technology becomes better and approaching perfection day by day, inkjet printing can provide finer and smoother, more exquisite image and print speed more efficiently, makes inkjet printing occupy superiority in the competition in image output market.
Because the develop rapidly of printer technology makes print speed and printing precision improve constantly, on the one hand, because the continuous print speed of accelerating requires ink jet recording medium will to improve on abilities such as ink absorption ability, solid black ability and quick-drying thereupon; On the other hand, because improving constantly of printing precision, the proportion that makes inkjet printing be used for photo output strengthens gradually, this just requires the ink-jet output medium also to want corresponding raising on performances such as high glaze, color saturation, water proofing property, anti-ultraviolet ageing and scratch resistance, with picture quality and the storage period that obtains to compare with the image that the silver halide system forms.
In order to satisfy the requirement of ink-jet output medium high glaze, application number is that 02121763.7 Chinese patent discloses a kind of ink jet recording materials, and has proposed to obtain as coating with hydrated alumina the high glaze of ink-jet output medium; Application number is that 200310101035.6 Chinese patent discloses ink-jet recording sheet, and proposes to improve as gloss layer with silica gel the glossiness of ink-jet output medium.
Yet use hydrated alumina when obtaining high glaze, the scratch resistance performance of coating to be reduced greatly, the ink-jet output medium in use is restricted as coating.If use silica gel to obtain high glaze,, can influence the blotting speed and the blotting amount of ink-jet output medium because the surface void of silica-gel coating is lower as coating or the method for using casting to be coated with.Casting is coated with the voidage of coating is reduced greatly, so the method that adopts silica-gel coating or casting to be coated with, the quick-drying of ink-jet output medium and blotting amount are difficult to reach requirement, are difficult to adapt to the requirement of more and more faster print speed.
In order to satisfy the requirement of ink-jet output medium water proofing property, the Chinese patent publication number is that the patent document of CN 1576045A proposes to add the waterproof ability that crosslinking agents such as formaldehyde, glutaraldehyde improve the ink-jet output medium in coating.Application number is that 200410047227.8 Chinese patent application discloses ink-jet recording paper and manufacture method thereof, and propose to add can be with ionization radioactive ray cross-linked hydrophilic resin raising waterproof ability.
Because the cross-linking reaction speed of formaldehyde or glutaraldehyde and polyvinyl alcohol is very fast, makes coating fluid add to be prone to aggegation behind formaldehyde or the glutaraldehyde and can't form coating smoothly, thereby make the coating production process be difficult to control.Adding can improve water proofing property with ionization radioactive ray cross-linked hydrophilic resin, the production process complexity, and with ionization radioactive ray cross-linking process floating coat flaws such as crackle are appearring easily at hydrophilic resin, apparent mass is descended.
Application number is that 200380107252.4 Chinese patent discloses a kind of ink absorption excellence, be suitable for the ink jet recording materials of high-speed record, it has at the ink-receiver layer that forms on the base material and is formed on the described base material, first coating layer that comprises pigment (for example wet silicon dioxide particulate) and binding agent, be formed on described first coating layer, comprise pigment (fumed silica for example, aluminium oxide etc.) and second coating layer of binding agent, and being formed on the 3rd coating layer on described second coating layer, this layer contains and comprises colloidal particles, the pigment of the fine-grained particles of aluminium oxide and/or pseudobochmite.
In the above-mentioned patent, the ink-jet output medium that wants to make material to obtain promising result simultaneously on high gloss, high scratch resistance ability, good inkjet printing performance, excellent waterproofness and good performances such as apparent mass is unusual difficulty.
Summary of the invention
The object of the present invention is to provide a kind of high glaze, inkjet printing function admirable, good waterproof performance, good, the solid good waterproof glossy ink-jet recording medium of China ink of surface strength, be applicable to paint ink and dye ink, especially for the solid black ability and the better ink jet recording medium of ink absorption ability of dye ink.
For achieving the above object, the technical solution used in the present invention is:
A kind of waterproof glossy ink-jet recording medium, comprise support and two-layer at least ink absorbing layer, ink absorbing layer contains the different inorganic pigment of specific area, hydrophily organic binder bond, combination crosslinking agent and cation dispersing agent, wherein, near the particle diameter of inorganic pigment contained in the ink absorbing layer of support particle diameter greater than inorganic pigment contained in the ink absorbing layer away from support; The combination crosslinking agent is the mixture of the amino resins of boron compound and modification.
Above-mentioned waterproof glossy ink-jet recording medium, described is fumed silica or sedimentation silica near the inorganic pigment in the ink absorbing layer of support, the specific area of fumed silica is 90~200m
2/ g, the particle diameter of sedimentation silica are 2~5 microns.
Above-mentioned waterproof glossy ink-jet recording medium, described is fumed silica and aluminium oxide away from the inorganic pigment in the ink absorbing layer of support, the specific area of fumed silica is 200~380m
2/ g, the primary particle size of aluminium oxide are 5~50 nanometers
Above-mentioned waterproof glossy ink-jet recording medium, described aggregate particle size near the inorganic pigment in the ink absorbing layer of support is 0.2~5 micron.
Above-mentioned waterproof glossy ink-jet recording medium, described aggregate particle size away from the inorganic pigment in the ink absorbing layer of support is 0.02~0.2 micron.
Above-mentioned waterproof glossy ink-jet recording medium, the weight ratio of described aluminium oxide and fumed silica are 1: 9~9: 1.
Above-mentioned waterproof glossy ink-jet recording medium, the weight ratio of the amino resins of described boron compound and modification are 4: 1~1: 2.
Above-mentioned waterproof glossy ink-jet recording medium, described cation dispersing agent are organic high molecular polymer.
The support that the present invention 32 uses, can be resin films such as polyethylene, polypropylene, polyvinyl chloride, diethyl carboxylic acid resin, triacetate resin, acrylic resin, polyethylene terephthalate resin, also can be paper base materials such as art paper, coated paper, cast-coated paper and plastic-coated paper, preferably adopting thickness be that the plastic-coated paper-based (RC paper substrate) of 50~250 micron thickness is a support.
This ink jet recording medium mainly relies on the ink absorbing layer of porous to reach sufficient absorption of inks ability, and the adding of inorganic pigment granules in the ink absorbing layer forms the space between inorganic pigment granules, thereby reaches enough ink absorption ability.The kind of inorganic pigment, grain shape and size have direct influence to the voidage of ink absorbing layer and the glossiness of coating, reach satisfied ink absorption ability and glossiness, and the kind of inorganic pigment, grain shape and size should meet some requirements.In order to guarantee that medium has enough ink absorption ability, need to use the bigger inorganic pigment of particle diameter to guarantee the voidage of ink absorbing layer, but the particle diameter of inorganic pigment is excessive, just can't obtain the coating of high glaze.So in order to obtain to take into account simultaneously the ink absorbing layer of ink absorption ability and high glaze, ink absorbing layer of the present invention contains the different inorganic pigment of specific area, hydrophily organic binder bond and combination crosslinking agent, wherein, the particle diameter of contained inorganic pigment is greater than the particle diameter of inorganic pigment contained in the ink absorbing layer away from support in the close ink absorbing layer of support, make medium obtain ink absorption ability preferably near the larger particles inorganic pigment in the support ink absorbing layer, away from making medium obtain higher gloss than the granule inorganic pigment in the support ink absorbing layer.
Pigment commonly used has inorganic pigments such as calcium carbonate, titanium dioxide, fumed silica, sedimentation silica, aluminium oxide, zirconia, its particle diameter is micron order or nanoscale, among the present invention, near the inorganic pigment in the ink absorbing layer of support is fumed silica or sedimentation silica, and the specific area of fumed silica is 90~200m
2/ g, the particle diameter of sedimentation silica are 2~5 microns; Away from the inorganic pigment in the ink absorbing layer of support is fumed silica and aluminium oxide, and the specific area of fumed silica is 200~380m
2/ g, the primary particle size of aluminium oxide are 5~50 nanometers.
Fumed silica is the fumed silica of producing by flame hydrolysis, adopts equipment such as high speed shear mulser, ultrasonic disperser, three-roll grinder, sand mill or high-pressure homogenizer that the silica dioxide granule of assembling is dispersed into 0.02~0.5 micron second particle.
Sedimentation silica is porous type silica, adopts equipment such as high speed shear mulser, ultrasonic disperser, three-roll grinder, sand mill or high-pressure homogenizer that the silica dioxide granule of assembling is dispersed into 0.5~5.0 micron particle.
The present invention is away from the character of employed aluminium oxide in the support ink absorbing layer owing to the easy positively charged of its particle itself, so the printing ink that has negative electrical charge is had very strong crystallized ability.When ink droplet is injected into coating surface, the alumina particle that has positive electricity in the coating will be had an effect with the ink colour developing group that has negative electricity, thereby ink is fixed in the last coating of medium, avoided downward coating of ink or horizontal spreading and sinking in to ooze, thereby made image color full, clear.Adopting primary particle size is the alumina particle of 5~50 nanometers, and preferably adopting primary particle size is the tabular hydrated alumina particles of 5~30 nanometers.Adopt short grained tabular alumina particle as last coating, not only can improve the solid black ability of coating, and its coating is also eager to excel in whatever one does than spherical particle for the albedo of light, thereby can improve the glossiness of coating.But the defective of the scratch resistance ability of independent aluminum oxide coating layer can restrict the use of ink jet recording medium greatly, in order to improve the scratch resistance ability that goes up coating, also need add vapor phase process silica particles in last coating.Because the adding of vapor phase process silica particles makes the arrangement of coating middle plateform shape alumina particle that certain disorder take place, though this can make the glossiness of coating that certain decline is arranged, makes the voidage of coating increase greatly, improves the ink absorption ability of coating.So the ratio of aluminium oxide and fumed silica in the adjusting coating can obtain glossiness, solid black ability and ink absorption ability and can both reach gratifying ink jet recording medium.The aluminium oxide among the present invention and the weight ratio of fumed silica are 1: 9~4: 1, preferred 1: 4~4: 1.
, intensity successional for obtaining and toughness can both meet the requirements of ink absorbing layer, form in the coating fluid of ink absorbing layer and need to add the hydrophily organic binder bond.
Of the present invention can be polyvinyl alcohol, carboxymethyl cellulose, polyvinylpyrrolidone, gelatin etc. away from the ink absorbing layer of support with near used hydrophilic agglomerant in the ink absorbing layer of support, preferred adopt that saponification degree surpasses more than 80%, the degree of polymerization is 1000~5000 polyvinyl alcohol, more preferably the degree of polymerization is 1700~5000 polyvinyl alcohol.The disadvantage of crackle appears in the degree of polymerization of polyvinyl alcohol too small coating easily, and the excessive viscosity of coating fluid that then can make of the degree of polymerization is big, thereby makes coating process be difficult to control.
In order to make ink absorbing layer have favorable waterproof property, avoid simultaneously coating to produce disadvantages such as warpage, embrittlement well, contain the combination crosslinking agent in the ink absorbing layer of the present invention, described combination crosslinking agent is the composition of boron compound and modified aminoresin, and its weight ratio is 4: 1~1: 2.
In known ink jet recording medium, crosslinking agent commonly used is a boron compound, and boron compound can be materials such as metaboric acid, ortho-boric acid, boric acid, Boratex, potassium borate, ammonium borate.But boron compound causes the water proofing property difference of coating easily or makes coating disadvantages such as warpage, embrittlement occur as crosslinking agent separately.For addressing this problem, the present invention has adopted the combination crosslinking agent, and it is the composition of boron compound and modified aminoresin, and its weight ratio is 4: 1~1: 2, and described boride is at least a in boric acid or the borate; Described modified aminoresin can be urea resin, the guanamine resin by substance modifications such as methyl alcohol, ethanol, propyl alcohol, butanols, resins such as melmac.
Silica dioxide granule has negative electrical charge owing to particle surface and water effect form the silanol base in aqueous dispersion, agglutination phenomenon takes place because of hydrogen bond action the organic binder bond in silanol base and the coating fluid, thereby can't obtain the coating of good-looking.So silica dioxide granule needed to use cation dispersing agent that the silanol base of silica dioxide granule silicon face is shielded before forming coating fluid.
Cation dispersing agent used in the present invention is an organic high molecular polymer, organic polymer cationic compound commonly used has the condensation body salt of polymine and salt, polyvinylamine and salt thereof, polyallylamine and salt thereof, acrylamide copolymer, dicyandiamide analog copolymer, secondary amine and epihalohydrin, the present invention preferably uses dimethyl diallyl ammonium chloride copolymer, mean molecule quantity is 2000~200000, preferred 5000~100000.The consumption of above-mentioned cationic polymer is 1~20 weight % with respect to inorganic pigment, preferred 1~10 weight %.
Can also add additives such as surfactant, fluorescent whitening agent, ultra-violet absorber, antioxidant, defoamer, anticorrisive agent, pH value conditioning agent in the coating fluid of the present invention.
Coating method of the present invention can adopt known coating process.As sliding pearl coating method, extrusion coated mode, airblade coating mode, scraper coating method etc., in order to improve coating efficiency, but the mode that preferably adopts multilayer once to be coated with, as multilayer extrusion coated mode.
In order to improve adhesive force of coatings, before being coated with on plastic sheeting or the resistance to water supports such as paper, adopt modes such as discharge process, flame treatment, UV treatment or plasma treatment to handle with the resin covering.
In the present invention, behind the coating ink absorbing layer, logical cold wind is cooled to coating below 20 ℃, can effectively prevent to occur in dry run disadvantages such as fine cracks, for the ink absorption ability of coating raising is arranged also.
The ink jet recording medium that the present invention obtains, glossiness height, water proofing property and ink absorption are good; The scratch resistance ability is strong; Inkjet printing function admirable, color are saturated.
The specific embodiment
Describe the present invention in detail below by embodiment.
Embodiment 1
Preparation near support ink absorbing layer coating fluid:
(Degussa A-90, specific area are 90m to fumed silica
2/ g) 100 parts (weight portion, down together),
5 parts of dimethyl diallyl ammonium chloride copolymers (mean molecule quantity is 80000),
5 parts of boric acid,
2 parts of ethanol modified urea-formaldehyde resins,
20 parts of polyvinyl alcohol (Kuraray pva235 saponification degree 88%, average degree of polymerization 3500),
0.5 part of OP-10 (Tianjin reagent in rich morning),
Adopt high-shear emulsion machine to be distributed to aggregate particle size silica and be 0.5 micron, add other auxiliary agents such as polyvinyl alcohol again, mix and form close support ink absorbing layer coating fluid.
Configuration away from support ink absorbing layer coating fluid
(Degussa A-200, specific area are 200m to fumed silica
2/ g) 100 parts,
5 parts of dimethyl diallyl ammonium chloride copolymers (mean molecule quantity is 20000),
100 parts in aluminium oxide (primary particle size is 12 nanometers),
5 parts of boric acid,
2 parts of ethanol modified urea-formaldehyde resins,
30 parts of polyvinyl alcohol (Kuraray pva235 saponification degree 88%, average degree of polymerization 3500),
0.8 part of OP-10 (Tianjin reagent in rich morning),
0.9 part in aluminium chloride,
Adopt high-shear emulsion machine to be distributed to aggregate particle size in silica and aluminium oxide and be 0.2 micron, add other auxiliary agents such as polyvinyl alcohol again, mix formation away from support ink absorbing layer coating fluid.
Use slope stream extrusion coating machine once to coat on the plastic-coated paper-based (RCShi yl) near the support ink absorbing layer with away from the support ink absorbing layer, after with 8 ℃ of cold wind coating being cooled off 45 seconds, enter 80 ℃ of temperature, carry out drying in the dry road of relative humidity 15%-20%.Coating layer dry weight 22g/m
2
The ink jet recording medium made from said method is carried out following several test evaluation, and its outcome record is in table 1.
Embodiment 2
With the specific area near support ink absorbing layer coating fluid among the embodiment 1 is 90m
2It is 200m that the fumed silica of/g is replaced by specific area
2/ g fumed silica (Degussa A-200), adopting high-shear emulsion machine to be distributed to aggregate particle size is 0.2 micron, and the ethanol modified urea-formaldehyde resin is replaced by the ethanol modified cyanurotriamide resin, and other conditions are with embodiment 1, obtain embodiment 2 ink jet recording mediums, evaluation result sees Table 1.
Embodiment 3
With the specific area near support ink absorbing layer coating fluid among the embodiment 1 is 90m
2The fumed silica of/g is replaced by sedimentation silica (Beijing space flight Saden SD-520, about 2 microns of average grain diameter), adopting high-shear emulsion machine to be distributed to aggregate particle size is 2 microns, near and be replaced by 4 parts away from the boric acid consumption of support ink absorbing layer coating fluid, the consumption of ethanol modified urea-formaldehyde resin is replaced by 1 part, other conditions obtain embodiment 3 ink jet recording mediums with embodiment 1, and evaluation result sees Table 1.
Embodiment 4
With the specific area near support ink absorbing layer coating fluid among the embodiment 1 is 90m
2The fumed silica of/g is replaced by sedimentation silica (Beijing space flight Saden SD-640, about 4 microns of average grain diameter), adopting high-shear emulsion machine to be distributed to aggregate particle size is 4 microns, near and be replaced by 2 parts away from the boric acid consumption of support ink absorbing layer coating fluid, the consumption of ethanol modified urea-formaldehyde resin is replaced by 4 parts, other conditions obtain embodiment 4 ink jet recording mediums with embodiment 1, and evaluation result sees Table 1.
Embodiment 5
With the specific area near support ink absorbing layer coating fluid among the embodiment 1 is 90m
2The fumed silica of/g is replaced by sedimentation silica (Beijing space flight Saden SD-960, about 5 microns of average grain diameter), adopting high-shear emulsion machine to be distributed to aggregate particle size is 5 microns, and other conditions are with embodiment 1, obtain embodiment 5 ink jet recording mediums, evaluation result sees Table 1.
Embodiment 6
With the specific area near support ink absorbing layer coating fluid among the embodiment 1 is 90m
2It is 150m that the fumed silica of/g is replaced by specific area
2/ g fumed silica (Degussa A-150), other conditions obtain embodiment 6 ink jet recording mediums with embodiment 1, and evaluation result sees Table 1.
Embodiment 7
With the specific area away from support ink absorbing layer coating fluid among the embodiment 1 is 200m
2It is 300m that the fumed silica of/g is replaced by specific area
2/ g fumed silica (Degussa A-300), adopting high-shear emulsion machine to be distributed to aggregate particle size is 0.1 micron, and other conditions obtain embodiment 7 ink jet recording mediums with embodiment 1, and evaluation result sees Table 1.
Embodiment 8
With the specific area away from support ink absorbing layer coating fluid among the embodiment 1 is 200m
2It is 380m that the fumed silica of/g is replaced by specific area
2/ g fumed silica (Degussa A-380), adopting high-shear emulsion machine to be distributed to aggregate particle size is 0.02 micron, and other conditions obtain embodiment 8 ink jet recording mediums with embodiment 1, and evaluation result sees Table 1.
Embodiment 9
With among the embodiment 1 away from the primary particle size of support ink absorbing layer coating fluid be 12 nano aluminium oxides to be replaced by primary particle size be 5 nano aluminium oxides, the aluminium oxide consumption is replaced by 180 parts, specific area is 200m
2The consumption of the fumed silica of/g is replaced by 20 parts, and other conditions obtain embodiment 9 ink jet recording mediums with embodiment 1, and evaluation result sees Table 1.
Embodiment 10
With among the embodiment 1 away from the primary particle size of support ink absorbing layer coating fluid be 12 nano aluminium oxides to be replaced by primary particle size be 50 nano aluminium oxides, the aluminium oxide consumption is replaced by 20 parts, specific area is 200m
2The consumption of the fumed silica of/g is replaced by 180 parts, and other conditions obtain embodiment 10 ink jet recording mediums with embodiment 1, and evaluation result sees Table 1.
Comparative example
With the specific area away from support ink absorbing layer coating fluid among the embodiment 1 is 200m
2The fumed silica of/g is replaced by sedimentation silica (Beijing space flight Saden SD-520, about 2 microns of average grain diameter), and other conditions obtain the comparative example ink jet recording medium with embodiment 1, and evaluation result sees Table 1.
Table 1: evaluation result
|
Glossiness |
Water proofing property |
The scratch resistance ability |
Ink absorption |
Color saturation |
Embodiment 1 |
47 |
√ |
55 (grams) |
√ |
2.25 |
Embodiment 2 |
45 |
√ |
50 (grams) |
√ |
2.23 |
Embodiment 3 |
42 |
□ |
50 (grams) |
√ |
2.25 |
Embodiment 4 |
40 |
√ |
50 (grams) |
√ |
2.26 |
Embodiment 5 |
39 |
√ |
55 (grams) |
△ |
2.20 |
Embodiment 6 |
53 |
√ |
55 (grams) |
√ |
2.26 |
Embodiment 7 |
55 |
√ |
45 (grams) |
√ |
2.30 |
Embodiment 8 |
50 |
√ |
50 (grams) |
√ |
2.25 |
Embodiment 9 |
55 |
√ |
50 (grams) |
√ |
2.31 |
Embodiment 10 |
50 |
√ |
50 (grams) |
√ |
2.21 |
Comparative example |
23 |
√ |
25 (grams) |
√ |
2.05 |
By the data that provide in the table 1 as can be seen, the ink jet recording medium that the present invention obtains can both reach good effect at glossiness, water proofing property, scratch resistance ability, ink absorption ability and color saturation.
Every performance in the table 1 is tested by following method.
1. glossiness
Use the portable mirror display glossness gauge of XGP to measure the glossiness at 60 degree angles of ink jet recording medium.
2. water proofing property
The side that ink jet recording medium is cut into 10cm * 10cm is fast, and the water of putting into 25 ℃ soaked 60 seconds, hung on 80 ℃ drying box drying, treat the medium bone dry after, estimate the crackle bar number of its appearance.Estimate according to following standard.
√: crackle do not occur.
: crackle 1-3 bar occurs.
△: crackle 4-10 bar occurs.
*: crackle appears more than 10.
3. scratch resistance ability
At ambient temperature ink jet recording medium is carried out the scratch resistance experiment with the scratch resistance instrument, write down critical counterweight quality.
4. ink absorption
Use Canon ip4300 ink-jet printer, adopt original-pack Canon dye ink, print 100% cyan, product look, yellow, redness, green, blueness and black color lump respectively, after just printing has finished, overlapping with paper at printing portion with PPC, applying light, visual observations copy to PPC and duplicate degree with the printing ink on the paper, estimate by following standard.
√: do not duplicate fully.
△: duplicate slightly.
*: massive duplication.
5. color saturation
Use Canon ip4300 ink-jet printer, adopt original-pack Canon dye ink, print 100% black color lump, with the reflection density of X-Rite 361 type densimeter measurement color lumps.