阅读说明：本技术 一种扣板油墨及其制备方法与应用 (Pinch plate ink and preparation method and application thereof ) 是由 黄志明 冯文照 李娟� 张小聪 周波 于 2021-09-18 设计创作，主要内容包括：本发明公开了一种扣板油墨及其制备方法与应用,包括以下原料：第一水性聚氨酯丙烯酸酯、有机胺、交联剂和第二水性聚氨酯丙烯酸酯。采用两种水性聚氨酯丙烯酸酯与有机胺、交联剂搭配,实现了优异的印刷扩缩性,使得快速印刷的字体不会模糊,字体边界不会有溢出现象,同时干燥性和稳定性好,可应用于凹版印刷,固化后的涂层具有较好的耐水性和耐溶剂性。(The invention discloses pinch plate ink and a preparation method and application thereof, wherein the pinch plate ink comprises the following raw materials: the adhesive comprises a first aqueous polyurethane acrylate, organic amine, a cross-linking agent and a second aqueous polyurethane acrylate. The two kinds of waterborne polyurethane acrylate are matched with the organic amine and the cross-linking agent, so that excellent printing scalability is realized, the fast-printing fonts cannot be blurred, the font boundaries cannot overflow, the drying performance and the stability are good, the coating can be applied to gravure printing, and the cured coating has good water resistance and solvent resistance.)

1. The buckle plate ink is characterized in that:

the method comprises the following raw materials:

the adhesive comprises a first aqueous polyurethane acrylate, organic amine, a cross-linking agent and a second aqueous polyurethane acrylate;

the lowest film forming temperature of the first waterborne polyurethane acrylate is more than 25 ℃, and the glass transition temperature is more than or equal to 90 ℃;

the lowest film-forming temperature of the second waterborne polyurethane acrylate is less than 25 ℃, and the glass transition temperature is more than or equal to 80 ℃.

2. The gusset plate ink of claim 1, wherein:

the mass parts of the first waterborne polyurethane acrylate, the organic amine, the cross-linking agent and the second waterborne polyurethane acrylate are as follows: 30-45: 1-3: 0.5-5: 9-14.

3. The gusset plate ink of claim 1, wherein:

the method also comprises the following raw materials:

rheological agent, titanium dioxide, kaolin, dispersant and solvent.

4. The gusset plate ink of claim 1, wherein:

the organic amine includes at least one of N, N-diethylethanolamine and 2-amino-2-methyl-1-propanol.

5. The gusset plate ink of claim 1, wherein:

the crosslinking agent includes at least one of ammonium zirconium carbonate, aziridine, and aminosilane.

6. The gusset plate ink of claim 1, wherein:

the glass transition temperature of the first aqueous urethane acrylate is greater than 90 ℃.

7. The gusset plate ink of claim 1, wherein:

the glass transition temperature of the second aqueous urethane acrylate is more than 80 ℃.

8. A method of making a gusset ink of claim 3, comprising: the method comprises the following steps:

and mixing the first waterborne polyurethane acrylate, the dispersing agent, the titanium dioxide and the kaolin into the solvent, and then adding the second waterborne polyurethane acrylate, the rheological agent, the organic amine and the crosslinking agent to obtain the pinch plate ink.

9. Use of a pinch plate ink as claimed in any one of claims 1 to 7 in gravure printing.

10. A panel, characterized by: the panel is coated with a coating made by curing a pinch plate ink of any one of claims 1 to 7.

Technical Field

The invention belongs to the technical field of printing ink, and particularly relates to pinch plate printing ink as well as a preparation method and application thereof.

Background

In order to meet the application requirement of high resistance of decorative products, the ink products also use ketone, benzene and DMF series solvents with high dissolving power in the production and manufacturing process and the printing process. Even if a VOC recovery device exists, the printing in a workshop for a long time can cause permanent harm to human bodies due to the fact that workers often contact benzene, ketone and ester non-environment-friendly solvents for a long time.

Gravure printing is a domestic main printing mode, the printing industry is limited by the technical conditions of China, the green packaging printing market starts late, the decorative gravure printing market mainly adopts solvent-type volatile drying printing at present, and water-based gravure ink, particularly plastic buckle plate transfer environment-friendly ink, is in the starting stage in China, the market consumption is small, the reason is the end, and the product performance is better than that of non-water-based gravure ink although the current water-based gravure ink is environment-friendly.

Therefore, it is imperative to develop an aqueous gravure ink with good performances in all aspects.

Disclosure of Invention

The first technical problem to be solved by the invention is as follows:

a pinch plate ink is provided.

The second technical problem to be solved by the invention is:

provides a preparation method of the pinch plate ink.

The third technical problem to be solved by the invention is:

the pinch plate ink is applied.

The invention further provides a panel, wherein a coating is coated on the panel and is prepared by curing the pinch plate ink.

In order to solve the first technical problem, the invention adopts the technical scheme that:

the pinch plate ink comprises the following raw materials:

the adhesive comprises a first aqueous polyurethane acrylate, organic amine, a cross-linking agent and a second aqueous polyurethane acrylate;

the lowest film forming temperature of the first waterborne polyurethane acrylate is more than 25 ℃, and the glass transition temperature is more than or equal to 90 ℃;

the lowest film-forming temperature of the second waterborne polyurethane acrylate is less than 25 ℃, and the glass transition temperature is more than or equal to 80 ℃.

The lowest film-forming temperature of the first waterborne polyurethane acrylate and the lowest film-forming temperature of the second waterborne polyurethane acrylate in the buckle plate ink are different, so that the first waterborne polyurethane acrylate can not form a film at normal temperature, the second waterborne polyurethane acrylate can form a film, the water resistance of the buckle plate ink system is enhanced, the printing scalability of the buckle plate ink system is more excellent, the fast-printed fonts can not be blurred, and the font boundary can not overflow.

The minimum film forming temperature of the first aqueous polyurethane acrylate can be more than 30 ℃, or more than 40 ℃, or more than 50 ℃, or more than 60 ℃, or more than 70 ℃, or more than 80 ℃, or more than 90 ℃. The glass transition temperature of the first waterborne polyurethane acrylate can be more than or equal to 100 ℃ or more than or equal to 110 ℃.

The minimum film forming temperature of the second waterborne polyurethane acrylate can be less than 20 ℃ or less than 10 ℃. The glass transition temperature of the second waterborne polyurethane acrylate can be more than or equal to 85 ℃.

The first aqueous urethane acrylate and the second aqueous urethane acrylate which have high molecular weight and high glass transition temperature are added into the buckle plate ink, so that the friction resistance, the butanone resistance and the ethanol resistance of the buckle plate ink are improved.

According to an embodiment of the present invention, the mass ratio of the first aqueous urethane acrylate to the second aqueous urethane acrylate is 30 to 45:9 to 14, and may be 40 to 45:9 to 14. By adjusting the proportion of the resin, the performances of better release property, water resistance, expansion and contraction, drying, plate dissolution and the like can be realized.

The mass ratio of the organic amine to the first waterborne polyurethane acrylate can be 1-3: 30-45.

The mass ratio of the crosslinking agent to the first aqueous urethane acrylate may be 0.5 to 5: 30-45.

According to one embodiment of the present invention, the mass parts ratio of the first aqueous urethane acrylate to the organic amine, the crosslinking agent, and the second aqueous urethane acrylate is: 30-45: 1-3: 0.5-5: 9-14.

According to an embodiment of the invention, the pinch plate ink further comprises the following raw materials:

rheological agent, titanium dioxide, kaolin, dispersant and solvent.

According to an embodiment of the present invention, when the organic amine is 1 part, the pinch plate ink has excellent water resistance.

According to an embodiment of the present invention, the crosslinking agent is at least one of aminosilane, aziridine, and ammonium zirconium carbonate.

The addition of different cross-linking agents all had some improvement in solvent resistance, but the stability was different. When the cross-linking agent is selected from ammonium zirconium carbonate, the pinch plate ink has optimal resistance and qualitative effect on a solvent.

According to one embodiment of the present invention, the organic amine includes at least one of N, N-diethylethanolamine and 2-amino-2-methyl-1-propanol.

According to an embodiment of the present invention, the glass transition temperature of the first aqueous urethane acrylate is greater than 80 ℃.

According to an embodiment of the present invention, the glass transition temperature of the second aqueous urethane acrylate is greater than 90 ℃.

The first aqueous polyurethane acrylate and the second aqueous polyurethane acrylate with high glass transition temperature are added into the buckle plate ink, so that the friction resistance, the butanone resistance and the ethanol resistance of the buckle plate ink are further improved.

In order to solve the second technical problem, the invention adopts the technical scheme that:

a method for preparing the pinch plate ink comprises the following steps:

and mixing the first waterborne polyurethane acrylate, the dispersing agent, the titanium dioxide and the kaolin into the solvent, and then adding the second waterborne polyurethane acrylate, the rheological agent, the organic amine and the crosslinking agent to obtain the pinch plate ink.

In the buckle plate ink, the solvent can be water or alcohol-water mixed solution, and when water is used as a dissolving carrier, volatile organic gases (VOC) are hardly emitted to the atmosphere in the production process or the printing process, so that the toxicity problem of solvent-based ink is solved, and the residual toxic substances on the surface of a printed matter are greatly reduced.

In addition, when water is used as a solvent, a higher solid content can be realized compared with the conventional solvent-based ink, so that the coating amount (the amount of ink consumed per unit printing area) of the pinch plate ink is reduced by about 10%. That is, the consumption of the aqueous ink is reduced by about 10% compared to the conventional ink when the same number and size of printed matters are printed.

In another aspect, the invention also relates to the application of the pinch plate ink in gravure printing.

In another aspect of the invention, a panel is provided, wherein the panel is coated with a coating layer, and the coating layer is prepared by curing the pinch plate ink.

One of the above technical solutions has at least one of the following advantages or beneficial effects:

the lowest film-forming temperature of the first waterborne polyurethane acrylate and the lowest film-forming temperature of the second waterborne polyurethane acrylate in the buckle plate ink are different, so that the first waterborne polyurethane acrylate can not form a film at normal temperature, the second waterborne polyurethane acrylate can form a film, the water resistance of the buckle plate ink system is enhanced, the printing scalability of the buckle plate ink system is more excellent, the fast-printed fonts can not be blurred, and the font boundary can not overflow;

the pinch plate ink has resistance to alcohol and ketone solvents, and when the cross-linking agent is ammonium zirconium carbonate, the alcohol and ketone solvents of the pinch plate ink can be wiped for 200 times and 100 times respectively.

By adding N, N-diethylethanolamine or 2-amino-2-methyl-1-propanol (AMP-95) to the pinch plate ink, the water resistance, solvent resistance and stability of the pinch plate ink can be increased when the addition amount is 1% or more.

As used herein, "first aqueous polyurethane acrylate" and "second aqueous polyurethane acrylate" are both aqueous polyurethane dispersions, typically having a solids content of 25-40%.

Detailed Description

In order to explain the technical content, the objects and the effects of the present invention in detail, the following description will be given with reference to the embodiments.

In the examples, PUD7906 resin from Gaoming chemical industry Co., Ltd, Fushan city was used as the first aqueous urethane acrylate, and the solid content was 28. + -. 2%.

In the examples, the second aqueous urethane acrylate was R-2203 resin from Dismann (China) Co., Ltd., and had a solid content of 26. + -. 2%.

In the examples, the organic amine is AMP-95.

In the examples, the solvent includes an ethanol/water mixed solution (mass ratio ethanol: deionized water: 6: 4) and an isopropanol/water mixed solution (mass ratio isopropanol: deionized water: 7: 3).

In the examples, the dispersant was an acrylic block copolymer, available from BASF as PX 4575.

In the examples, the rheological agent was polyether polyurethane, available from the courtesy (shanghai) chemical co ltd, model rheelate 299.

Example 1

The pinch plate ink comprises the following raw materials in parts by mass:

44 parts of first aqueous polyurethane acrylate, 0.5 part of dispersing agent, 25 parts of titanium dioxide, 5 parts of ethanol/water mixed solution (mass ratio of ethanol to deionized water is 6: 4), 5 parts of kaolin, 7.5 parts of isopropanol/water mixed solution (mass ratio of isopropanol to deionized water is 7: 3), 9 parts of second aqueous polyurethane acrylate, 1 part of organic amine, 1 part of ammonium zirconium carbonate and 2 parts of rheological agent.

And mixing the first aqueous polyurethane acrylate, the dispersing agent, the titanium dioxide, the kaolin, the ethanol/water mixed solution (the mass ratio of ethanol to deionized water is 6: 4) and the isopropanol/water mixed solution (the mass ratio of isopropanol to deionized water is 7: 3), and adding a second aqueous polyurethane acrylate, a rheological agent, organic amine and a cross-linking agent ammonium zirconium carbonate to obtain the pinch plate ink.

Example 2

The pinch plate ink comprises the following raw materials in parts by mass:

39 parts of first aqueous polyurethane acrylate, 0.5 part of dispersing agent, 25 parts of titanium dioxide, 4 parts of ethanol/water mixed solution (mass ratio of ethanol to deionized water is 6: 4), 5 parts of kaolin, 7.5 parts of isopropanol/water mixed solution (mass ratio of isopropanol to deionized water is 7: 3), 14 parts of second aqueous polyurethane acrylate, 1 part of organic amine, 1 part of ammonium zirconium carbonate and 2 parts of rheological agent.

And mixing the first aqueous polyurethane acrylate, the dispersing agent, the titanium dioxide, the kaolin, the ethanol/water mixed solution (the mass ratio of ethanol to deionized water is 6: 4) and the isopropanol/water mixed solution (the mass ratio of isopropanol to deionized water is 7: 3), and adding a second aqueous polyurethane acrylate, a rheological agent, organic amine and a cross-linking agent ammonium zirconium carbonate to obtain the pinch plate ink.

Example 3

The pinch plate ink comprises the following raw materials in parts by mass:

39 parts of first aqueous polyurethane acrylate, 0.5 part of dispersing agent, 20 parts of titanium dioxide, 5 parts of ethanol/water mixed solution (mass ratio of ethanol to deionized water is 6: 4), 10 parts of kaolin, 7.5 parts of isopropanol/water mixed solution (mass ratio of isopropanol to deionized water is 7: 3), 14 parts of second aqueous polyurethane acrylate, 1 part of organic amine, 1 part of ammonium zirconium carbonate and 2 parts of rheological agent.

And mixing the first aqueous polyurethane acrylate, the dispersing agent, the titanium dioxide, the kaolin, the ethanol/water mixed solution (the mass ratio of ethanol to deionized water is 6: 4) and the isopropanol/water mixed solution (the mass ratio of isopropanol to deionized water is 7: 3), and then adding a second aqueous polyurethane acrylate, a rheological agent, organic amine and a cross-linking agent ammonium zirconium carbonate to obtain the buckle plate ink.

Example 4

The pinch plate ink comprises the following raw materials in parts by mass:

39 parts of first aqueous polyurethane acrylate, 0.5 part of dispersing agent, 25 parts of titanium dioxide, 5 parts of ethanol/water mixed solution (mass ratio of ethanol to deionized water is 6: 4), 5 parts of kaolin, 7.5 parts of isopropanol/water mixed solution (mass ratio of isopropanol to deionized water is 7: 3), 11 parts of second aqueous polyurethane acrylate, 1 part of organic amine, 1 part of ammonium zirconium carbonate and 5 parts of rheological agent.

And (2) mixing the first waterborne polyurethane acrylate, the dispersing agent, the titanium dioxide, the kaolin, the ethanol/water mixed solution (the mass ratio of ethanol to deionized water is 6: 4) and the isopropanol/water mixed solution (the mass ratio of isopropanol to deionized water is 7: 3), and then adding a second waterborne polyurethane acrylate, a rheological agent, organic amine and a cross-linking agent zirconium ammonium carbonate to obtain the buckle ink.

Example 5

The amount of AMP-95 in the formulation of example 1 was tested, with all other raw material choices and amounts remaining unchanged. Then, the pinch plate ink is prepared according to the formula, and the test results are as follows:

table 1: the addition amount of organic amine (AMP-95) is related to water resistance, odor, pH value and stability

The level number is 1-5; grade 1 is worst and grade 5 is best.

The standard grade classification of odor is as follows: grade 1 had a very pronounced odor, grade 3 had a lighter odor, and grade 5 had essentially no odor.

As can be seen from Table 1, the amount of AMP-95 used is preferably 1 part, which indicates that the higher the amount of organic amine used, the more excellent the scrub resistance of the pinch plate ink.

Example 6

Ammonium zirconium carbonate in the formulation of example 1 was replaced with aziridine or aminosilane and the amount of ammonium zirconium carbonate was tested, with no change in the remaining raw material selection and amount. Then, the pinch plate ink is prepared according to the formula, and the test results are as follows:

table 2: comparison of the Cross-linking agent with solvent resistance, Water resistance, stability

The level number is 1-5; grade 1 is worst and grade 5 is best.

The standard grades of solvent resistance (grades 1-5) are classified as follows: the nonwoven fabric is dipped in water and wiped for 12 times or less to obtain 5 grades, 10 times or less to obtain 4 grades, 8 times or less to obtain 3 grades, 6 times or less to obtain 2 grades, and 4 times or less to obtain 1 grade.

The standard rating classification for water resistance is as follows: the nonwoven fabric can be wiped more than 20 times.

The standard classes of stability performance (grades 1-5) are classified as follows: fraction 1 was very stratified with significant sedimentation; stage 4 had very slight demixing and settling, and stage 5 had no demixing and settling at all.

Table 3: the addition amount of the ammonium zirconium carbonate Bacote 20 cross-linking agent is compared with the solvent resistance and stability

Item	0.5％	1％	1.5％	2％
					Solvent resistance (alcohols)	150 times of	200 times (one time)	200 times (one time)	200 times (one time)
Solvent resistance (ketones)	30 times (twice)	50 times	70 times (twice)	100 times (twice)
					Stability (5 days/55 ℃ C.)	Stabilization	Stabilization	Stabilization	Stabilization

Through the data in table 2, the resistance of the addition of different cross-linking agents to the solvent is improved, but the stability is different, and the performance effect of the pinch plate ink prepared by comparing ammonium zirconium carbonate is optimal.

The data in Table 3 can understand that different addition amounts of ammonium zirconium carbonate Bacote 20 can enhance the tolerance performance of the product to alcohol and ketone solvents.

Comparative example 1

Sample 1 was PUD7906 resin from Gaoming-Germany chemical Co., Ltd, Fushan.

Sample 2 was R-2203 resin from Disemann (China) Ltd.

Sample 3 is Kyow-PVC 2001, open in Shanghai.

Sample 4 is BASF1695。

The resin properties of samples 1 to 4 are as follows:

TABLE 4

TABLE 5

Butanone resistance

Ethanol resistance

Release property of PET

Fastness between layers

Film forming property

Friction resistance

Sample 1

10 times of

40 times (twice)

100% release type

4 stage

Does not form a film

Grade 5

Sample 2

5 times (twice)

20 times (twice)

100% release type

Grade 5

Film formation

4 stage

Sample 3

Intolerance of heat

15 times of

50% release type

Grade 5

Film formation

Grade 3.5

Sample No. 4

Intolerance of heat

Intolerance of heat

50% release type

Grade 5

Film formation

Level 1

Note that: 1. the level number is 1-5; grade 1 is worst and grade 5 is best.

2. Solvent resistance test method: soaking a 50g weight in cotton cloth, and performing wiping detection on the cotton cloth by using a corresponding solvent.

The standard grades of interlayer fastness (grades 1-5) are classified as follows: the grade 1 interlayer has no adhesive force completely, the grade 2 interlayer adhesive force is less than 60%, the grade 3 interlayer adhesive force is 60-80%, the grade 4 interlayer adhesive force is 80-95%, and the grade 5 interlayer adhesive force is 95-100%.

The standard grades of friction resistance (grades 1-5) are classified as follows: with nonwoven fabric wiping, 5 grades can be wiped more than 30 times, 4 grades can be wiped about 20 times, 3.5 grades can be wiped about 15 times, and 1 grade can be wiped less than 5 times.

It is evident that of the above samples, sample 1 and sample 2 are superior in butanone resistance, ethanol resistance, PET release property, interlayer fastness and rubbing resistance to sample 3 and sample 4.

And (3) performance testing:

in the above examples 1-4, the solvent resistance of the film formed by the sample under different resin ratios, the effect of the different filler addition ratios on the print expansion and shrinkage of the sample, and the effect of the different rheology agent ratios on the product transfer rate were mainly detected by adjusting the ratios of the water-based resin, the filler, the titanium dioxide, and the rheology agent to perform the cyclic ratio. The product standardized formulation was established by transverse longitudinal comparisons. The specific test results are as follows:

table 6: printing performance comparison table of water-based pinch plate ink embodiment

The standard class of release (grades 1-5) is classified as follows: grade 5 represents 90-100% release, grade 4 represents 70-90% release, grade 3 represents 50-70% release, and grade 2 represents 30-50% release. Grade 1 represents 30% inner release.

The standard grades of temperature resistance (grades 1-5) are classified as follows: indicated by the shade of the color, level 5 for off-white, level 4 off-yellow, level 3 for brown, level 2 for black-gray, level 1 for black, and level 5-1 for light to dark.

Standard grades of water resistance (grades 1-5) are classified as follows: with nonwoven fabric wiping, 5 grades can be wiped more than 30 times, 4 grades can be wiped about 20 times, 3.5 grades can be wiped about 15 times, and 1 grade can be wiped less than 5 times.

The standard level of scalability (levels 1-5) is classified as follows: the 5-level font has no expansion and contraction, the 4-level font has slight expansion and contraction of 0.1-0.2mm, the 3-level font has moderate expansion and contraction of 0.2-0.3mm, and the 1-2-level font has severe expansion and contraction of 0.3-0.5.

The standard grades of solvent resistance (grades 1-5) are classified as follows: the nonwoven fabric is dipped in water and wiped for 12 times or less to obtain 5 grades, 10 times or less to obtain 4.5 grades, 8 times or less to obtain 3 grades, 6 times or less to obtain 2 grades, and 4 times or less to obtain 1 grade.

The standard level of stratification in thinning ink stability (levels 1-5) is classified as follows: the level 1 of delamination represents more than 40% delamination of the ink sample after standing for a long time, the level 2 represents 30-40% delamination, the level 3 represents 10% -30%, the level 4-5 represents 0-10%, and the level 4.5 represents 0-5%.

The standard grades of sedimentation (grades 1-5) in thinning ink stability are classified as follows: sedimentation description the thickness and hardness of the sedimented samples are expressed in grades: grade 1 is more than 40% of sedimentation and high in hardness, grade 2 represents 30-40% of soft sedimentation, grade 3 represents 10-20% of soft sedimentation, grade 4 represents 0-10% of soft sedimentation, and grade 5 represents no sedimentation.

From table 6, it can be seen that by adjusting the proportion of the filler and the titanium dioxide, the equivalent performance of the product is reduced more seriously in the aspect of water resistance, and the increase of the filler has a good effect of increasing the viscosity of the product.

In the embodiment 4, 3 parts of the rheological additive is added, so that the viscosity of the sample is well increased, but the expansion and contraction of the product are seriously reduced, so that the application effect is not good; the proportion of resin in the formula of the product in the example 2 is adjusted to be lower than that of the formula in the example 1 in the aspects of expansion and contraction, viscosity and stability, and the application effect is not as good as that of the formula in the example 1. Therefore, from the above analysis of experimental data, the application of the pinch plate ink prepared according to the formulation of example 1 is preferred.

In the above test items, part of the performance test methods are as follows:

water resistance: the non-woven fabric is dipped in water and then wiped on the film for more than 20 times. Whether ink was lost and the severity of ink loss were observed for comparison.

Solvent resistance: and (3) coating a 50g weight with non-woven fabric, soaking cyclohexanone/butanone, and wiping the ink coated on the plate with the fineness of 50 microns.

Temperature resistance: the color changes in light and dark at 190 deg.C for 1-2 hr

Stability: and (5) placing the printing ink in an oven at 50-55 ℃ for 5 days, and observing whether sedimentation and delamination exist. Comparatives standards were graded by severity of degree.

Fineness: GB/T13217.3-2008 liquid ink fineness test method.

Viscosity: GB/T13217.4-2008 liquid ink viscosity test method.

And (3) fastness to adhesion: GB/T13217.7-2009 liquid ink adhesion fastness test method.

Dissolving a plate: the dissolved state of the ink in the corresponding diluting solvent was measured by a squeegee fineness meter and expressed in terms of the dissolved state, percentage, and grade. The test temperature (25 +/-2) DEG C is tested in parallel for a plurality of times until the test result is stable for at least 3 times, and the test result can be determined as the final test result.

And (3) plate dissolving inspection:

(1) and (4) wiping the scraper and a scraper of the scraper fineness meter, and uniformly mixing the tested ink by using an ink mixing knife.

(2) A small amount of ink (standard ink and comparative ink) is taken by a doctor blade and placed at 50 μm of the double groove of the squeegee, preferably in an amount such that the groove is filled with the ink and slightly excessive.

(3) Holding the scraper with both hands, transversely putting the scraper in scraper blade upper end (sample edge) perpendicularly, pulling the scraper to shallow position by the position that the ink slot is dark in 3 seconds, making the black appearance be full of the slot, and do not remain surplus black on the flat board, after the scraper pulled, blow with the electric blowing and weather the black appearance on the scraper blade, await measuring.

(4) The scraper blade is laid flat across the underside of the blade with the edge of the blade aligned with the uppermost edge of the blade so that the blade is at a fixed angle to the table top.

(5) And (3) sucking the diluted solvent corresponding to the test by using a suction pipe, flushing the solvent from a double-groove middle flat plate at the top of the scraper, wherein the solvent is preferably uniformly flowed to the double-groove ink surface, and is an alcohol-water mixed solvent, and the weight part ratio of alcohol to water is 7: 3.

(6) Observing the dissolution speed, state and percentage of the ink layer, continuously replenishing the solvent until no ink is dissolved out and flows down, and recording the phenomenon.

And (4) recording a plate dissolving result:

(1) the standard and the contrast ink sample are dissolved quickly and slowly and are compared in state;

(2) percent dissolution of standard and control inks;

(3) dissolution speed: the dissolution is carried out after 1-2 seconds of grade 5, after 2-3 seconds of grade 4, after 3-4 seconds of grade 3, the dissolution is carried out after more than 4 seconds of grade 2, and the dissolution is carried out for grade 1.

The clean degree of the scraper blade: 1-5, where 5 indicates that the blade is clean without any residue, 4 indicates that there is little residue on the blade and the color of the blade can be seen, and so on, and 1 indicates that the blade is covered with an ink film and has little dissolution and wash-off.

The above description is only an example of the present invention and is not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention as described in the specification of the present invention or directly or indirectly applied to the related technical fields are included in the scope of the present invention.