CN109878234A - A kind of multicoat water development-type exempts from processing and is directly printed on the machine version - Google Patents
A kind of multicoat water development-type exempts from processing and is directly printed on the machine version Download PDFInfo
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- CN109878234A CN109878234A CN201910058581.7A CN201910058581A CN109878234A CN 109878234 A CN109878234 A CN 109878234A CN 201910058581 A CN201910058581 A CN 201910058581A CN 109878234 A CN109878234 A CN 109878234A
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Abstract
A kind of multicoat water development-type disclosed by the invention exempts from processing and is directly printed on the machine version, aluminium plate including sealing pores, infrared laser sensitive layer, protective layer, hydrophilic layer is equipped between the aluminium plate and infrared laser sensitive layer, the hydrophilic layer includes the modified Nano hydrophilic coating using aqueous polyurethane as performed polymer, adhesive, by the way that hydrophilic layer is arranged, it on the one hand can be high with aluminium base compactness, on the other hand strong with infrared laser sensitive layer adhesive force, for the adhesive force for improving hydrophilic layer and aluminium base, it also added adhesive in hydrophilic layer, it strengthens the binding force of infrared laser sensitive layer and aluminium base and prevents infrared laser sensitive layer from so that the space of a whole page roller print is occurred when printing because gluing excessively, influence press quality, this programme exempts to handle version infrared laser sensitive layer and substrate compactness height, fill aluminium base version surface Grains gap, keep coating flat It is whole, raw material is saved, guarantees press quality.
Description
Technical field
The present invention relates to print fields, and in particular to a kind of multicoat water development-type exempts from processing and is directly printed on the machine version.
Background technique
As people produce the continuous improvement of environmental requirement and national continuing to increase on Environmental Inputs, people to printing
The cry of the environmental requirement of industry is also continuously improved, and processless CTP CTP(includes exempting to be chemically treated plate) with its tempting reduction
Cost and environmental-friendly characteristic, are just attract the concern of more and more people.
In the prior art, exempt from chemical treatment version to be made of 3 layer materials, first is that aluminum substrate support, aluminum substrate support makes
With by electrochemistry roughening, anodic oxidation and sealing pores 0.15~0.40mm high-purity aluminium plate；Second is that infrared laser sensitive layer,
The layer is mainly made of macromolecule resin and IR dyes, to the infrared laser sensitive of 780~850nm；Third is that protective layer, is protected
Sheath is mainly made of water soluble polymer, plays the role of starvation and protection photosensitive layer.The principle of imaging is that use is infrared
Laser forms spatial network mechanism, becomes insoluble in aobvious to plate Imagewise exposure, the coated polymeric of light-exposed part or crosslinking hardening
The areas of the exposure area of shadow liquid (water), that is, ink-receptive, and not light-exposed part can be in the effect of fountain solution and developer solution (water)
Under be removed, expose following hydrophilic version base, form hydrophilic white space.
However, it is quick to be unfavorable for infrared laser there is also surface Grains gap or impurity even across pretreated aluminum substrate
The smooth coating of sense layer and the waste for causing raw material, in addition from according to image-forming principle, it is desirable that infrared laser sensitive layer has parent
It is aqueous, just and want high with the compactness of aluminum substrate and be unlikely to situations such as causing deinking, in order to increase compactness, existing way be
Increase adhesive in infrared laser sensitive coating, however this to also result in processless CTP tacky, so that the space of a whole page roller print is occurred.
Summary of the invention
Exempt from processing to solve the above problems, the present invention provides a kind of multicoat water development-type and be directly printed on the machine version, it is infrared
Laser-sensitive layer and substrate compactness are high, are coated with smooth, saving raw material.
The technical solution that the present invention solves, which is to provide a kind of multicoat water development-type, to be exempted from processing and is directly printed on the machine version, including
The aluminium plate of sealing pores, infrared laser sensitive layer, protective layer are equipped with hydrophilic between the aluminium plate and infrared laser sensitive layer
Layer.
Preferably, the hydrophilic layer includes modified hydrophilic coating, the adhesive using aqueous polyurethane as performed polymer.
Preferably, the preparation step of the modified Nano hydrophilic coating is as follows: (1) by N hydroxymethyl acrylamide, propylene
Amide, initiator are dissolved in ethanol solution；(2) aqueous polyurethane, acrylate, vinyl pyrrolidone are dissolved in the water, are mixed
It is added dropwise in the ethanol solution of step (1)；(3) step (2) resulting mixed solution is taken, initiator for reaction, heat preservation is added and is dropped
Temperature discharging.
Preferably, the initiator is persulfate.
Preferably, the initiator additional amount is 0.1-0.5 parts, and aqueous polyurethane additional amount is 80-90 parts.
Preferably, in the step (3), initiator adding manner is to be added by several times.
Preferably, in the step (3), cooling discharge temperature is less than 50oC.
Preferably, the reaction time in the step (3) is 3-5 hours, and soaking time is 0.5-2 hours.
The direct upper type of this programme exempts to handle version using hot melt thermoplastic techniques, is heating in thermoplastic thermal polymer system, red
Outer absorbent absorbs infrared laser, converts light energy into thermal energy, while transferring thermal energy to thermal polymerization, and thermal polymerization causes
Agent releases competent primary free radical, and primary group of free radicals causes the unsaturation in unsaturated functional polymer adhesive or performed polymer
Double bond realizes the linear polymerization of free radical.
Thereby realizing photosensitive layer is hydrophilic before unexposed, but after exposure, heat occurs under the action of heat for coating
Molten thermoplastic hot polymerization reaction, is transformed into oleophylic coating.After upper printing machine, unexposed area is hydrophilic, in the effect of fountain solution or water
Under, coating is dissolved and is taken away by ink paper, and light-exposed area becomes oleophylic since thermoplastic reaction occurs, and is absorbed ink and is printed as
Picture and text.
Aluminum substrate is the high photo-polymerization type plate of sensitivity, be it is generally acknowledged exempt to handle plate support, need before the use
It is empty need to fill surface Grains when being coated with infrared laser sensitive layer for the impurity that surface Grains gap is removed by pre-processing
For gap with smooth coating, this has resulted in the waste of raw material, on the other hand, and red although aluminum substrate has certain hydrophily
The space that the compactness and adhesive force of outer laser-sensitive layer are still improved.
The Waterborne Polyurethane Prepolymer for reacting preparation with polyether polyol using polyisocyanic acid base herein, with metering system
The aqueous molecule such as acid, acrylamide, vinylpyrrolidone and N hydroxymethyl acrylamide and vinyl sulfonate is in persulfate
As free radical polymerization under conditions of initiator, interpenetrating network system is formed by hud polymerization or the method for grafting
Form, prepares the material for the aqueous polyurethane haveing excellent performance, and the introducing of these large hydrophilic moleculars significantly improves hydrophilic film
Moistening property of water, and aqueous polyurethane itself for existing infrared laser sensitive layer have more good adhesive force, together
When for improve hydrophilic layer and aluminium base adhesive force, also added adhesive in hydrophilic layer, the adhesive that this programme uses is
One or more of epoxy resin, polyurethanes, organic silicon, polyimide.
It is not the reason of infrared laser sensitive layer directly adds adhesive, if directly addition can make infrared laser sensitive layer
There is certain viscosity after exposure polymerization, when printing makes the space of a whole page roller print occur, influences press quality.
The hydrophilic layer and infrared laser sensitive layer prepared all contains polar group such as-OH ,-COOH, convenient for be combineding with each other, when
The distance between the two molecule becomes very hour (reaching within 1A), between polar group due to Van der Waals force, chemical affinity,
The comprehensive function of hydrogen bond equicohesive power reaches attachment balance, therefore hydrophilic layer on the one hand can be high with aluminium base compactness, another party
Face and infrared laser sensitive layer adhesive force are strong, under the premise of adding adhesive or not in infrared laser sensitive layer, strengthen red
The binding force of outer laser-sensitive layer and aluminium base.
From the viewpoint of molecular structure, the polarity of molecule and interaction of molecules power, the adhesive force between coating is generated
The polar group orientation of polymer molecule in coating, and its attracting each other between the polar group of adjacent layer surface polarity molecule
Power, only polar group is adapted between the two, can just obtain the good paint film of adhesive force;Conversely, the good coating of polarity is coated in non-pole
Property plate on, or nonpolar coating is coated on polar plate, and adhesive force will not all be got well.
Since persulfate initiator is in the presence of ethyl alcohol, decomposition rate can be accelerated, if primary be added excessively
Initiator will lead to the case where end reaction Chengdu is inadequate, and solid content does not increase, thus in the reaction of acrylic ester polymerization
It mostly takes and initiator is added in system by several times, the addition that can reduce initiator by a small amount of repeatedly addition initiator is total
Amount, so that the problem of reducing initiator excessively and leading to subsequent initiation system gel, makes coating not have mobility, reaction failure.
The beneficial effects of the present invention are, it, on the one hand can be high with aluminium base compactness by the way that hydrophilic layer is arranged, on the other hand
It is strong with infrared laser sensitive layer adhesive force, for the adhesive force for improving hydrophilic layer and aluminium base, it also added gluing in hydrophilic layer
Agent strengthens the binding force of infrared laser sensitive layer and aluminium base and prevents infrared laser sensitive layer from making version when printing because gluing excessively
There is roller print in face, influences press quality, and this programme exempts to handle version infrared laser sensitive layer and substrate compactness height, filling aluminum
Base version surface Grains gap makes to be coated with smooth, saving raw material, guarantee press quality.
Specific embodiment
In order to make content of the present invention easily facilitate understanding, With reference to embodiment to of the present invention
Technical solution is described further, but the present invention is not limited only to this.
Embodiment 1
It takes 10gN- hydroxymethyl acrylamide, 10g acrylamide, 0.05g Ammonium Persulfate 98.5 to be dissolved in 100ml ethanol solution, stirs
Uniformly, mixed liquor A is obtained, aqueous polyurethane, 10g acrylate, 10g vinyl pyrrolidone are dissolved in 100ml water by 80g,
It stirs evenly, obtains mixed liquid B, B solution is slowly dropped into solution A, prepare the Ammonium Persulfate 98.5 solution of 10mg/ml, first
The above-mentioned Ammonium Persulfate 98.5 solution of secondary dropwise addition 5ml is stirred to react under conditions of 75 degrees Celsius into the mixed liquor of solution A and solution B
After 1.5h, then the above-mentioned Ammonium Persulfate 98.5 solution of 5ml is added dropwise, 1.5h is stirred to react under conditions of at 75 degrees Celsius, stops reaction and protect
Warm 0.5h, and reaction kettle is cooled to 50 degrees Celsius of dischargings, obtains modified Nano hydrophilic coating, take 10g nano-hydrophilic coating with
0.1g epoxy resin is uniformly mixed at 50 c to get hydrophilic coating.
Aluminium base version impregnates away surface and oil contaminant with acetone soln first, is then cleaned with ultrasonic cleaner to remove
The impurity in plate surface Grains gap is removed, it is to be coated.
The hydrophilic coating of preparation is coated in pretreated aluminium base version, by drying, is coated with infrared laser sensitive layer
Coating, drying are coated with the protective layer for completely cutting off air and moisture content, are drying to obtain multicoat water development-type and exempt from processing directly
Machine galley is connected, the coating thickness of hydrophilic layer and the coating mass area ratio of infrared laser sensitive layer are 1.5g/m2。
Embodiment 2
It takes 10gN- hydroxymethyl acrylamide, 10g acrylamide, 0.05g Ammonium Persulfate 98.5 to be dissolved in 100ml ethanol solution, stirs
Uniformly, mixed liquor A is obtained, aqueous polyurethane, 10g acrylate, 10g vinyl pyrrolidone are dissolved in 100ml water by 90g,
It stirs evenly, obtains mixed liquid B, B solution is slowly dropped into solution A, prepare the Ammonium Persulfate 98.5 solution of 50mg/ml, first
The above-mentioned Ammonium Persulfate 98.5 solution of secondary dropwise addition 5ml is stirred to react under conditions of 75 degrees Celsius into the mixed liquor of solution A and solution B
After 1.5h, then the above-mentioned Ammonium Persulfate 98.5 solution of 5ml is added dropwise, 3.5h is stirred to react under conditions of at 75 degrees Celsius, stops reaction and protect
Warm 2h, and reaction kettle is cooled to 50 degrees Celsius of dischargings, modified Nano hydrophilic coating is obtained, 10g nano-hydrophilic coating and 0.1g are taken
Epoxy resin is uniformly mixed at 50 c to get hydrophilic coating.
Aluminium base version impregnates away surface and oil contaminant with acetone soln first, is then cleaned with ultrasonic cleaner to remove
The impurity in plate surface Grains gap is removed, it is to be coated.
The hydrophilic coating of preparation is coated in pretreated aluminium base version, by drying, is coated with infrared laser sensitive layer
Coating, drying are coated with the protective layer for completely cutting off air and moisture content, are drying to obtain multicoat water development-type and exempt from processing directly
Machine galley is connected, the coating thickness of hydrophilic layer and the coating mass area ratio of infrared laser sensitive layer are 1.5g/m2。
Embodiment 3
It takes 10gN- hydroxymethyl acrylamide, 10g acrylamide, 0.05g Ammonium Persulfate 98.5 to be dissolved in 100ml ethanol solution, stirs
Uniformly, mixed liquor A is obtained, aqueous polyurethane, 10g acrylate, 10g vinyl pyrrolidone are dissolved in 100ml water by 80g,
It stirs evenly, obtains mixed liquid B, B solution is slowly dropped into solution A, prepare the Ammonium Persulfate 98.5 solution of 20mg/ml, first
The above-mentioned Ammonium Persulfate 98.5 solution of secondary dropwise addition 5ml is stirred to react under conditions of 75 degrees Celsius into the mixed liquor of solution A and solution B
After 1.5h, then the above-mentioned Ammonium Persulfate 98.5 solution of 5ml is added dropwise, 2h is stirred to react under conditions of at 75 degrees Celsius, stops reaction heat preservation
1h, and reaction kettle is cooled to 50 degrees Celsius of dischargings, modified Nano hydrophilic coating is obtained, 10g nano-hydrophilic coating and 0.1g ring are taken
Oxygen resin is uniformly mixed at 50 c to get hydrophilic coating.
Aluminium base version impregnates away surface and oil contaminant with acetone soln first, is then cleaned with ultrasonic cleaner to remove
The impurity in plate surface Grains gap is removed, it is to be coated.
The hydrophilic coating of preparation is coated in pretreated aluminium base version, by drying, is coated with infrared laser sensitive layer
Coating, drying are coated with the protective layer for completely cutting off air and moisture content, are drying to obtain multicoat water development-type and exempt from processing directly
Machine galley is connected, the coating thickness of hydrophilic layer and the coating mass area ratio of infrared laser sensitive layer are 1.5g/m2。
Embodiment 4
Aluminium base version impregnates away surface and oil contaminant with acetone soln first, is then cleaned with ultrasonic cleaner to remove plate
The impurity in material surface Grains gap, it is to be coated.
Infrared laser sensitive coating is applied in processed aluminium base version, drying, is coated with for completely cutting off sky
The protective layer of gas and moisture content, be drying to obtain multicoat water development-type exempt from processing be directly printed on the machine version, infrared laser sensitive layer
Being coated with mass area ratio is 1.5g/m2。。
Embodiment 5
Adhesive force test: will be cut in the aluminium base version of the coated infrared laser sensitive layer of embodiment 1-4 6 be parallel to each other, spacing
Equal cut mark, then vertical cutting or the former Cutting Road number and the identical cut mark of spacing, Checker marking knife piece spacing is 2mm, after cutting,
Occur 25 grids in tested aluminium base version, two diagonals with banister brush along grid gently brush off chip, according to GB/
The evaluation criteria of T9286-88, test result is as follows for adhesive force:
As can be seen from the results, after coated hydrophilic layer, infrared laser sensitive layer is stronger in conjunction with aluminium base version, but when also being reacted simultaneously
Between, the influence of reflection temperature, the factors such as initiator additional amount.
Hydrophily test: the aluminium base version mm specification of 50 mm × 50 of coated hydrophilic layer in Example 1-3 takes reality
The aluminium base version mm specification of 50 mm × 50 for applying uncoated hydrophilic layer in example, by thickness control of the coating after dry 0.2~
0.3 μm, (180 degrees Celsius, 2 min) are placed it in thermostatic drying chamber, aluminium foil is taken out from thermostatic drying chamber, will be tried
Sample is entirely fixed on the work top of contact angle instrument, is powered on, and the horizontal (level in object lens of contact angle instrument is adjusted
The parting line of line and sample coincides), distilled water is added in drop adjuster, is fixed on host, micrometer head is rotated,
Suitable quantity of water is set to form water droplet on syringe needle, drop controls in (0.05 ± 0.005) g range in specimen surface, water droplet quality,
Water droplet rotates cross hairs and workbench horizontal adjustment knob in eyepiece, test water droplet and painting after specimen surface extends 60 s
Layer contact angle α, does parallel laboratory test three times, as a result as follows:
As can be seen that although the aluminium base version hydrophily of uncoated hydrophilic layer is up to state standards (α < 15), coated hydrophilic layer
Afterwards, whole hydrophily improves.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (8)
1. a kind of multicoat water development-type, which exempts from processing, is directly printed on the machine version, aluminium plate, infrared laser including sealing pores are quick
Feel layer, protective layer, which is characterized in that hydrophilic layer is equipped between the aluminium plate and infrared laser sensitive layer.
2. a kind of multicoat water development-type according to claim 1, which exempts from processing, is directly printed on the machine version, which is characterized in that parent
Water layer includes modified hydrophilic coating, the adhesive using aqueous polyurethane as performed polymer.
3. a kind of multicoat water development-type according to claim 2, which exempts from processing, is directly printed on the machine version, which is characterized in that institute
The preparation step for stating modified Nano hydrophilic coating is as follows: (1) being dissolved in N hydroxymethyl acrylamide, acrylamide, initiator
Ethanol solution；(2) aqueous polyurethane, acrylate, vinyl pyrrolidone are dissolved in the water, mixing is added dropwise to the second of step (1)
In alcoholic solution；(3) step (2) resulting mixed solution is taken, initiator for reaction, heat preservation and cooling discharge is added.
4. a kind of multicoat water development-type according to claim 3, which exempts from processing, is directly printed on the machine version, which is characterized in that institute
Stating initiator is persulfate.
5. a kind of multicoat water development-type according to claim 3, which exempts from processing, is directly printed on the machine version, which is characterized in that institute
Stating initiator additional amount is 0.1-0.5 parts, and aqueous polyurethane additional amount is 80-90 parts.
6. a kind of multicoat water development-type according to claim 3, which exempts from processing, is directly printed on the machine version, which is characterized in that institute
It states in step (3), initiator adding manner is to be added by several times.
7. a kind of multicoat water development-type according to claim 3, which exempts from processing, is directly printed on the machine version, which is characterized in that institute
It states in step (3), cooling discharge temperature is less than 50oC。
8. a kind of multicoat water development-type according to claim 3, which exempts from processing, is directly printed on the machine version, which is characterized in that institute
Stating the reaction time in step (3) is 3-5 hours, and soaking time is 0.5-2 hours.
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| CN201910058581.7A CN109878234B (en) | 2019-01-22 | 2019-01-22 | Multi-coating water development type treatment-free direct-loading printing plate |
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| CN201910058581.7A CN109878234B (en) | 2019-01-22 | 2019-01-22 | Multi-coating water development type treatment-free direct-loading printing plate |
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| CN109878234B CN109878234B (en) | 2021-05-07 |
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| EP1211293A2 (en) * | 2000-11-30 | 2002-06-05 | Kansai Paint Co., Ltd. | Curing type water base resin composition |
| JP2006027278A (en) * | 2005-08-22 | 2006-02-02 | Fuji Photo Film Co Ltd | Lithographic printing original plate with high printing resistance |
| CN101192004A (en) * | 2006-11-27 | 2008-06-04 | 乐凯集团第二胶片厂 | Chemical processing-free negative graph photosensitive composition suitable for UV-CTP and planographic printing plate manufactured therefor and planographic printing plate manufacture method |
| WO2008137910A2 (en) * | 2007-05-07 | 2008-11-13 | Massachusetts Instutute Of Technology | Matrix stabilization of aggregation-based assays |
| CN102540709A (en) * | 2010-12-30 | 2012-07-04 | 乐凯华光印刷科技有限公司 | Infrared sensitive chemistry-free light-sensing composition and lithographic printing plate made from same |
| CN103183803A (en) * | 2011-12-29 | 2013-07-03 | 晶硕光学股份有限公司 | Preparation method for hydrophilic silicone prepolymer |
| CN104562719A (en) * | 2014-12-29 | 2015-04-29 | 安踏（中国）有限公司 | Preparation method of base cloth fabric applied to synthetic leather and preparation method of synthetic leather |
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1135049A (en) * | 1995-05-03 | 1996-11-06 | 李三保 | Polyester precoated photosensitive plate and mfg. method thereof |
| EP1211293A2 (en) * | 2000-11-30 | 2002-06-05 | Kansai Paint Co., Ltd. | Curing type water base resin composition |
| JP2006027278A (en) * | 2005-08-22 | 2006-02-02 | Fuji Photo Film Co Ltd | Lithographic printing original plate with high printing resistance |
| CN101192004A (en) * | 2006-11-27 | 2008-06-04 | 乐凯集团第二胶片厂 | Chemical processing-free negative graph photosensitive composition suitable for UV-CTP and planographic printing plate manufactured therefor and planographic printing plate manufacture method |
| WO2008137910A2 (en) * | 2007-05-07 | 2008-11-13 | Massachusetts Instutute Of Technology | Matrix stabilization of aggregation-based assays |
| CN102540709A (en) * | 2010-12-30 | 2012-07-04 | 乐凯华光印刷科技有限公司 | Infrared sensitive chemistry-free light-sensing composition and lithographic printing plate made from same |
| CN103183803A (en) * | 2011-12-29 | 2013-07-03 | 晶硕光学股份有限公司 | Preparation method for hydrophilic silicone prepolymer |
| CN104562719A (en) * | 2014-12-29 | 2015-04-29 | 安踏（中国）有限公司 | Preparation method of base cloth fabric applied to synthetic leather and preparation method of synthetic leather |
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