Coating composition and coating for highlight digital photographic paper as well as preparation method and application of coating

Abstract

The invention relates to the technical field of coatings of ethylene-vinyl acetate copolymers, and discloses a coating composition for highlight digital photographic paper, a coating and a preparation method and application of the coating. The coating composition comprises a vinyl acetate-ethylene copolymer emulsion, silicon dioxide, a silicon emulsion, a wetting agent and a defoaming agent, and the vinyl acetate-ethylene copolymer emulsion is an emulsion with double glass transition temperatures. The coating provided by the invention is applied to the highlight digital photographic paper, and has the advantages of good gloss, good ink absorption, full paint film, no powder falling and no after-tack.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings of ethylene-vinyl acetate copolymers, and particularly relates to a coating composition and a coating for high-gloss digital photo paper, and a preparation method and application thereof. Background Art

[0002] The biggest feature of high-gloss digital photo paper is its fast ink absorption speed, fast drying speed, a layer of gloss on the surface of the printed photo, good moisture-proof effect and the texture of traditional photos.

[0003] However, the coatings for high-gloss digital photo paper in the prior art have problems of poor gloss, powder shedding and back adhesion.

[0004] Therefore, due to the requirement of fast drying speed for high-gloss digital photo paper, there are high requirements for the selection and proportion of the water-absorbing adhesive of the surface coating. Otherwise, two extremes of back adhesion or powder shedding will occur. Therefore, it is of great significance to research and develop a coating for high-gloss digital photo paper. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defect problems of poor gloss of the coatings for high-gloss digital photo paper in the prior art, and the occurrence of back adhesion and / or powder shedding. The present invention provides a coating composition and a coating for high-gloss digital photo paper, and a preparation method and application thereof. The coating provided by the present invention has good gloss, good ink absorption, full paint film, no powder shedding and no back adhesion when applied to high-gloss digital photo paper.

[0006] To achieve the above purpose, in the first aspect of the present invention, a coating composition for high-gloss digital photo paper is provided. The coating composition includes vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent. The vinyl acetate-ethylene copolymer emulsion is a double glass transition temperature emulsion, and the double glass transition temperature emulsion has two glass transition temperatures of -5°C to 0°C and 10 - 15°C.

[0007] In the second aspect of the present invention, a coating prepared by using the foregoing coating composition is provided.

[0008] In the third aspect of the present invention, a preparation method of the foregoing coating is provided. The preparation method includes: mixing vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent under stirring conditions, and standing to obtain the coating.

[0009] In the fourth aspect of the present invention, an application of the foregoing coating in high-gloss digital photo paper is provided.

[0010] Through the above technical solution, the coating provided by the present invention is non-toxic, odorless, easily degradable, pollution-free, safe and environmentally friendly, harmless to the human body, and has low cost. In addition, when the coating provided by the present invention is applied to high-gloss digital photo paper, it has the advantages of good gloss, good ink absorption, full paint film, no powder falling, and no back adhesion. In addition, the preparation method of the coating provided by the present invention is simple, which is conducive to realizing industrial production. Detailed Embodiments

[0011] In the ranges disclosed herein, the endpoints and any values are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0012] As described above, in a first aspect of the present invention, there is provided a coating composition for high-gloss digital photo paper. Among them, the coating composition includes a vinyl acetate-ethylene copolymer emulsion, silica, a silicone emulsion, a wetting agent, and an antifoaming agent. Among them, the vinyl acetate-ethylene copolymer emulsion is a double glass transition temperature emulsion, and the double glass transition temperature emulsion has two glass transition temperatures of -5°C to 0°C and 10 - 15°C.

[0013] The inventors of the present invention found during the research process that: by using a double glass transition temperature emulsion having two glass transition temperatures of -5°C to 0°C and 10 - 15°C, and further, by fully exerting the synergistic effect of the coating raw materials including a vinyl acetate-ethylene copolymer emulsion, silica, a silicone emulsion, a wetting agent, and an antifoaming agent, a coating can be obtained that has good gloss, good ink absorption, full paint film, no powder falling, and no back adhesion when applied to high-gloss digital photo paper.

[0014] According to the present invention, the components of the vinyl acetate-ethylene copolymer emulsion include 3 - 4 parts of a -5°C to 0°C glass transition temperature emulsion and 1 - 2 parts of a 10 - 15°C glass transition temperature emulsion; preferably, the vinyl acetate-ethylene copolymer emulsion is 3 parts of a -5°C to 0°C glass transition temperature emulsion and 1 part of a 10 - 15°C glass transition temperature emulsion.

[0015] According to the present invention, the preparation method of the vinyl acetate-ethylene copolymer emulsion includes: blending a -5°C to 0°C glass transition temperature emulsion and a 10 - 15°C glass transition temperature emulsion under normal temperature conditions.

[0016] According to the present invention, relative to 100 parts by weight of the coating composition, the content of the vinyl acetate-ethylene copolymer emulsion is 20-40 parts by weight, the content of the silica is 40-60 parts by weight, the content of the silicone emulsion is 5-20 parts by weight, the content of the wetting agent is 3-5 parts by weight, and the content of the defoaming agent is 3-5 parts by weight. In the present invention, limiting the components and component contents in the coating composition to the foregoing ranges can enable the prepared coating to have good gloss, good ink absorption, a plump paint film, no powder falling, and no back sticking when applied to high-gloss digital photo paper.

[0017] According to the present invention, the silica includes silicon powder with a particle size less than 11 μm; preferably, the average particle size of the silica is 10-11 μm; more preferably, the average particle size of the silica is 11 μm.

[0018] According to the present invention, the component of the silicone emulsion is silica; preferably, the average particle size of the silicone emulsion is 5-20 μm.

[0019] According to the present invention, the wetting agent is a non-ionic wetting agent; preferably, the wetting agent is a non-ionic wetting solution, and more preferably it is commercially available Solvay ST-83.

[0020] According to the present invention, the defoaming agent is a block polyether defoaming agent; preferably, the defoaming agent is a block polyether defoaming agent, and more preferably it is commercially available Momentive MP2000.

[0021] The second aspect of the present invention provides a coating prepared by using the foregoing coating composition.

[0022] The third aspect of the present invention provides a preparation method of the foregoing coating, wherein the preparation method includes: mixing and standing the vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent under stirring conditions to obtain the coating.

[0023] According to the present invention, the conditions for mixing include: the temperature is 30-50 °C, and the time is 20-60 min; preferably, the temperature is 55 °C and the time is 40 min.

[0024] According to the present invention, the conditions for stirring include: the stirring rate is 1200 revolutions per minute - 1600 revolutions per minute; preferably, the stirring rate is 1500 revolutions per minute.

[0025] According to the present invention, the conditions for standing include: the time is 90-120 min, and preferably, the time is 120 min.

[0026] The fourth aspect of the present invention provides an application of the foregoing coating in high-gloss digital photo paper.

[0027] The present invention will be described in detail below through embodiments.

[0028] In the following embodiments:

[0029] VAE emulsion JF-I, short for vinyl acetate-ethylene copolymer emulsion, is purchased from Chongqing Chuanwei Chemical Co., Ltd., Sinopec Group.

[0030] Embodiment 1

[0031] The composition of the coating includes:

[0032] VAE emulsion: 20 parts of VAE emulsion JF-I;

[0033] Silica: 60 parts with a particle size less than 11 μm.

[0034] Silicone emulsion: 10 parts with a particle size of 5 - 20 μm.

[0035] Wetting agent: 5 parts of wetting agent (commercially available Solvay ST-83);

[0036] Defoaming agent: 5 parts of modified silicone (commercially available Momentive MP2000).

[0037] The preparation method of the coating is as follows:

[0038] Mix the raw materials including vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent at a temperature of 55°C for 40 min until evenly mixed; then disperse evenly at a rotation speed of 1500 revolutions per minute and let stand for 120 minutes.

[0039] Embodiment 2

[0040] The composition of the coating includes:

[0041] VAE emulsion: 20 parts of VAE emulsion JF-I (from Chongqing Chuanwei Chemical Co., Ltd., Sinopec Group);

[0042] Silica: 50 parts with a particle size less than 1250 mesh.

[0043] Silicone emulsion: 20 parts with a particle size of 5 - 20 microns.

[0044] Wetting agent: 5 parts of wetting agent (commercially available Solvay ST-83);

[0045] Defoaming agent: 5 parts of modified silicone (commercially available Momentive MP2000).

[0046] The preparation method of the coating is as follows:

[0047] Mix the raw materials including vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent at a temperature of 55°C for 40 minutes until evenly mixed; then disperse evenly at a speed of 1500 revolutions per minute and let stand for 120 minutes.

[0048] Example 3

[0049] The composition of the coating includes:

[0050] VAE emulsion: 25 parts of VAE emulsion JF-I (from Chongqing Chuanwei Chemical Co., Ltd., Sinopec Group);

[0051] Silica: 60 parts with a particle size less than 1250 mesh.

[0052] Silicone emulsion: 10 parts with a particle size of 5-20 microns.

[0053] Wetting agent: 3 parts of wetting agent (commercially available Solvay ST-83);

[0054] Defoaming agent: 2 parts of modified silicone (commercially available Momentive MP2000).

[0055] The preparation method of the coating is as follows:

[0056] Mix the raw materials including vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent at a temperature of 55°C for 40 minutes until evenly mixed; then disperse evenly at a speed of 1500 revolutions per minute and let stand for 120 minutes.

[0057] Example 4

[0058] The composition of the coating includes:

[0059] VAE emulsion: 25 parts of VAE emulsion JF-I (from Chongqing Chuanwei Chemical Co., Ltd., Sinopec Group);

[0060] Silica: 55 parts with a particle size less than 1250 mesh.

[0061] Silicone emulsion: 10 parts with a particle size of 5-20 microns.

[0062] Wetting agent: 5 parts of wetting agent (commercially available Solvay ST-83);

[0063] Defoaming agent: 5 parts of modified silicone (commercially available Momentive MP2000).

[0064] The preparation method of the coating is as follows:

[0065] Mix the raw materials including vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent at a temperature of 55°C for 40 minutes until evenly mixed; then disperse evenly at a rotation speed of 1500 revolutions per minute and let stand for 120 minutes.

[0066] Example 5

[0067] The composition of the coating includes:

[0068] VAE emulsion: 30 parts of VAE emulsion JF-I (from Chongqing Chuanwei Chemical Co., Ltd., Sinopec Group);

[0069] Silica: 55 parts with a particle size less than 1250 mesh.

[0070] Silicone emulsion: 5 parts with a particle size of 5-20 microns.

[0071] Wetting agent: 2 parts of wetting agent (commercially available Solvay ST-83);

[0072] Defoaming agent: 3 parts of modified silicone (commercially available Momentive MP2000).

[0073] The preparation method of the coating is as follows:

[0074] Mix the raw materials including vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent at a temperature of 55°C for 40 minutes until evenly mixed; then disperse evenly at a rotation speed of 1500 revolutions per minute and let stand for 120 minutes.

[0075] Example 6

[0076] The composition of the coating includes:

[0077] VAE emulsion: 30 parts of VAE emulsion JF-I (from Chongqing Chuanwei Chemical Co., Ltd., Sinopec Group);

[0078] Silica: 50 parts with a particle size less than 1250 mesh.

[0079] Silicone emulsion: 15 parts with a particle size of 5-20 microns.

[0080] Wetting agent: 2 parts of wetting agent (commercially available Solvay ST-83);

[0081] Defoaming agent: 3 parts of modified silicone (commercially available Momentive MP2000).

[0082] The preparation method of the coating is as follows:

[0083] Mix the raw materials including vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent at a temperature of 55°C for 40 minutes until evenly mixed; then disperse evenly at a rotation speed of 1500 revolutions per minute and let stand for 120 minutes.

[0084] Example 7

[0085] The composition of the coating includes:

[0086] VAE emulsion: 35 parts of VAE emulsion JF-I (from Chongqing Chuanwei Chemical Co., Ltd., Sinopec Group);

[0087] Silica: 45 parts with a particle size less than 1250 mesh.

[0088] Silicone emulsion: 15 parts with a particle size of 5-20 microns.

[0089] Wetting agent: 2 parts of wetting agent (commercially available Solvay ST-83);

[0090] Defoaming agent: 3 parts of modified silicone (commercially available Momentive MP2000).

[0091] The preparation method of the coating is as follows:

[0092] Mix the raw materials including vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent at a temperature of 55°C for 40 minutes until evenly mixed; then disperse evenly at a rotation speed of 1500 revolutions per minute and let stand for 120 minutes.

[0093] Example 8

[0094] The composition of the coating includes:

[0095] VAE emulsion: 35 parts of VAE emulsion JF-I (from Chongqing Chuanwei Chemical Co., Ltd., Sinopec Group);

[0096] Silica: 55 parts with a particle size less than 1250 mesh.

[0097] Silicone emulsion: 5 parts with a particle size of 5-20 microns.

[0098] Wetting agent: 2 parts of wetting agent (commercially available Solvay ST-83);

[0099] Defoaming agent: 3 parts of modified silicone (commercially available Momentive MP2000).

[0100] The preparation method of the coating is as follows:

[0101] Mix the raw materials including vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent at a temperature of 55°C for 40 minutes until evenly mixed; then disperse evenly at a speed of 1500 revolutions per minute and let stand for 120 minutes.

[0102] Example 9

[0103] The composition of the coating includes:

[0104] VAE emulsion: 40 parts of VAE emulsion JF-I (from Chongqing Chuanwei Chemical Co., Ltd., Sinopec Group);

[0105] Silica: 50 parts with a particle size less than 1250 mesh.

[0106] Silicone emulsion: 5 parts with a particle size of 5-20 microns.

[0107] Wetting agent: 2 parts of wetting agent (commercially available Solvay ST-83);

[0108] Defoaming agent: 3 parts of modified silicone (commercially available Momentive MP2000).

[0109] The preparation method of the coating is as follows:

[0110] Mix the raw materials including vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent at a temperature of 55°C for 40 minutes until evenly mixed; then disperse evenly at a speed of 1500 revolutions per minute and let stand for 120 minutes.

[0111] Example 10

[0112] The composition of the coating includes:

[0113] VAE emulsion: 40 parts of VAE emulsion JF-I (from Chongqing Chuanwei Chemical Co., Ltd., Sinopec Group);

[0114] Silica: 45 parts with a particle size less than 1250 mesh.

[0115] Silicone emulsion: 10 parts with a particle size of 10-20 microns.

[0116] Wetting agent: 2 parts of wetting agent (commercially available Solvay ST-83);

[0117] Defoaming agent: 3 parts of modified silicone (commercially available Momentive MP2000).

[0118] The preparation method of the coating is as follows:

[0119] Mix the raw materials including vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoamer at a temperature of 55°C for 40 minutes until well mixed; then disperse evenly at a speed of 1500 revolutions per minute and let stand for 120 minutes.

[0120] Test Example

[0121] Apply the coatings prepared in Examples 1-10 to the high-gloss photo paper coating, then dry at 110°C for 10 minutes, then cool at room temperature for 30 minutes, and take out some materials for color photo paper printing (applied to high-gloss digital photo paper) and appearance testing. Except for the different coatings in each group, other conditions are the same. The results are shown in Table 1.

[0122] Table 1

[0123] Project Color and luster Back tack Powder dropping condition Good ink absorption Full paint film Example 1 Natural color None None Good Full Example 2 Natural color None None Good Full Example 3 Natural color None None Good Full Example 4 Natural color None None Good Full Example 5 Natural color None None Good Full Example 6 Natural color None None Good Full Example 7 Natural color None None Good Full Example 8 Natural color None None Good Full Example 9 Natural color None None Good Full Example 10 Natural color None None Good Full

[0124] It can be seen from the results in Table 1 that the coatings prepared in Examples 1-10 using the method of the present invention are used to manufacture high-gloss photo paper, with good gloss, good ink absorption, full paint film, no powder dropping and no back adhesion. Moreover, this coating has no pungent smell and is safe and environmentally friendly.

[0125] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solutions of the present invention, including any other suitable combination of each technical feature. These simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A coating composition for high-gloss digital photo paper, characterized in that, the coating composition comprises a vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent, wherein the vinyl acetate-ethylene copolymer emulsion is a double glass transition temperature emulsion, and the double glass transition temperature emulsion has two glass transition temperatures of -5°C to 0°C and 10 - 15°C.

2. The coating composition according to claim 1, wherein, the components of the vinyl acetate-ethylene copolymer emulsion include 3 - 4 parts of a glass transition temperature emulsion of -5°C to 0°C and 1 - 2 parts of a glass transition temperature emulsion of 10 - 15°C.

3. The coating composition according to claim 2, wherein, the vinyl acetate-ethylene copolymer emulsion is 3 parts of a glass transition temperature emulsion of -5°C to 0°C and 1 part of a glass transition temperature emulsion of 10 - 15°C.

4. The coating composition according to any one of claims 1 - 3, wherein, the preparation method of the vinyl acetate-ethylene copolymer emulsion includes: blending the glass transition temperature emulsion of -5°C to 0°C and the glass transition temperature emulsion of 10 - 15°C at room temperature to obtain the vinyl acetate-ethylene copolymer emulsion.

5. The coating composition according to any one of claims 1 - 4, wherein, relative to 100 parts by weight of the coating composition, the content of the vinyl acetate-ethylene copolymer emulsion is 20 - 40 parts by weight, the content of the silica is 40 - 60 parts by weight, the content of the silicone emulsion is 5 - 20 parts by weight, the content of the wetting agent is 3 - 5 parts by weight, and the content of the defoaming agent is 3 - 5 parts by weight.

6. The coating composition according to claim 1 or 5, wherein, the silica includes silicon powder with a particle size less than 11μm; preferably, the average particle size of the silica is 10 - 11μm; and / or, the component of the silicone emulsion is silica; preferably, the average particle size of the silicone emulsion is 5 - 20μm; and / or, the wetting agent is a non-ionic wetting agent; preferably, the wetting agent is a non-ionic wetting liquid, more preferably Solvay ST-83; and / or, the defoaming agent is a block polyether defoaming agent; preferably, the defoaming agent is a block polyether defoaming agent, more preferably Momentive MP2000.

7. A coating prepared by using the coating composition according to any one of claims 1 - 6.

8. A preparation method of the coating according to claim 7, characterized in that, the preparation method includes: mixing, under stirring conditions, the vinyl acetate-ethylene copolymer emulsion, silica, silicone emulsion, wetting agent and defoaming agent, and then standing to obtain the coating.

9. The preparation method according to claim 8, wherein, the conditions for mixing include: temperature is 30 - 50°C, time is 20 - 60 min; and / or, the conditions for stirring include: stirring rate is 1200 revolutions per minute - 1600 revolutions per minute; and / or, the conditions for standing include: time is 90 - 120 min.

10. An application of the coating according to claim 7 in high-gloss digital photo paper.