Anti-sublimation slurry as well as preparation method and application thereof

Abstract

The invention relates to the technical field of printing, in particular to anti-sublimation slurry as well as a preparation method and application thereof. The anti-sublimation slurry is prepared from the following components in parts by weight: 55 to 60 parts of waterborne polyurethane emulsion and 30 to 35 parts of silica gel powder. The transparent anti-sublimation slurry which does not affect the printing color is obtained by taking the waterborne polyurethane as a binder and the silica gel powder as an adsorbent, and the anti-sublimation slurry has excellent peel strength and adsorption capacity, and can adsorb pigment particles on cloth to prevent the pigment particles from sublimating to pollute the printing.

Description

Technical Field

[0001] The invention relates to the technical field of printing, and in particular to an anti-sublimation slurry and a preparation method and application thereof. Background Art

[0002] With the improvement of living standards, people begin to pay more and more attention to the beauty of shoes and clothes, and printing that can form various colors and text patterns is very popular. In the preparation process of shoe materials, dyes of various colors are often used. When these dyes encounter high temperature or constant temperature and humidity conditions, they are easy to sublimate to the surface of white glue or color paste, and yellow spots, black spots and other color spots will appear. This not only affects the appearance of the printed product, but also weakens the overall performance of the printing.

[0003] The Chinese invention patent with announcement number CN108373725A discloses an anti-sublimation primer, which includes an acrylic polymer, activated carbon, a dispersant and water. The anti-sublimation primer is screen-printed between the print and the fabric, and the pigment is adsorbed by the adsorption capacity of the activated carbon in the anti-sublimation primer to prevent sublimation. However, the activated carbon will deepen the color of the anti-sublimation slurry. When the coverage of the print is not enough, the dark anti-sublimation layer will affect the overall color of the print. The dispersibility of activated carbon in polyacrylic acid emulsion is poor. Increasing the dispersibility of activated carbon by strengthening mechanical action will make the activated carbon particles smaller, the emulsion will foam, and the ability of the anti-sublimation layer to adsorb dyes will be reduced. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an anti-sublimation slurry with strong adsorption capacity and no influence on printing color, and a preparation method and application thereof.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an anti-sublimation slurry, calculated by weight, includes 55-60 parts of aqueous polyurethane emulsion and 30-35 parts of silica gel powder.

[0006] Another technical solution adopted by the present invention is: the preparation method of the above-mentioned anti-sublimation slurry comprises the following steps: adding an aqueous polyurethane emulsion, then adding a defoamer and a wetting and leveling agent at a stirring speed of 600 to 700 rpm / min, then adjusting the stirring speed to 1300 to 1500 rpm / min, adding silica gel powder and a dispersant for mixing, and finally adding a thickener to obtain the anti-sublimation slurry.

[0007] Another technical solution adopted by the present invention is: the application of the above-mentioned anti-sublimation slurry comprises the following steps:

[0008] S1: Apply primer on the fabric to form a base layer after drying;

[0009] S2: Mixing the anti-sublimation slurry with a curing agent and applying the mixture on the primer layer to form an anti-sublimation layer after drying;

[0010] S3: Printing a print layer on the anti-sublimation layer.

[0011] The beneficial effects of the present invention are as follows: the present invention uses water-based polyurethane as a connecting material and silica gel powder as an adsorbent to obtain a transparent anti-sublimation slurry, which will not affect the overall color of the print even when the printing coverage is insufficient. Compared with the traditional oily polyacrylic acid emulsion, the water-based polyurethane emulsion has stronger environmental protection and peeling resistance. Silica gel powder is added to the water-based polyurethane emulsion, and the microporous structure formed by the gaps of the aggregate of the colloidal particles in the silica gel powder is used to adsorb the pigment particles, thereby preventing the sublimation of the color particles from contaminating the printing color. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The structure diagram of the printed cloth of the fifth embodiment of the present invention;

[0013] Description of labels:

[0014] 1. Printing layer; 2. Anti-sublimation layer; 3. Base layer; 4. Base fabric. DETAILED DESCRIPTION

[0015] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0016] The invention discloses an anti-sublimation slurry, which comprises 55-60 parts of waterborne polyurethane emulsion and 30-35 parts of silica gel powder in parts by weight.

[0017] From the above description, it can be seen that the beneficial effects of the present invention are: the anti-sublimation slurry of the present invention selects silica gel powder as an adsorbent. When the sublimated color particles in the cloth pass through the silica gel powder, the gaps between the aggregates of the colloidal particles in the silica gel powder form an internal microporous structure, which firmly adsorbs the pigment particles in the anti-sublimation layer, preventing the color particles from contaminating the color of the printing layer. The slurry prepared with silica gel powder as an adsorbent is transparent in color, does not affect the color of the printing layer in the subsequent process, and increases the diversity of printing colors;

[0018] Conventional anti-sublimation slurry uses polyacrylic acid emulsion as the base slurry. The surface tension difference between polyacrylic acid emulsion and cloth and other adhesives is large, the adhesion is small, the formed adhesive layer is not strong enough, and the performance in terms of water resistance and hydrolysis resistance is poor. The anti-sublimation slurry of the present invention uses water-based polyurethane as the base slurry. The water-based polyurethane contains urethane groups and isocyanate groups, has high reactivity and advanced properties, can form excellent chemical adhesion with fabrics, is environmentally friendly, has high peeling strength, and has excellent fastness.

[0019] Furthermore, the invention also includes an auxiliary agent, which includes at least one of a defoamer, a wetting and leveling agent, a dispersant and a thickener.

[0020] From the above description, it can be seen that the defoamer and thickener can ensure the uniform coating of the anti-sublimation slurry, and the wetting and leveling agent makes the silica gel powder well dispersed in the emulsion.

[0021] Furthermore, calculated by weight, the additives include 0.2 to 0.4 parts of a defoamer, 0.5 to 1 parts of a wetting and leveling agent, 0.4 to 0.7 parts of a dispersant, and 3 to 5 parts of a thickener.

[0022] Furthermore, the defoaming agent is a mineral oil defoaming agent or a polysiloxane defoaming agent.

[0023] Furthermore, the wetting and leveling agent is at least one of a polyether leveling agent, an acrylate leveling agent and a polyether-modified polysiloxane leveling agent.

[0024] Furthermore, the aqueous polyurethane emulsion includes at least one of polyether polyurethane, polyester polyurethane, aliphatic polyurethane and aromatic polyurethane.

[0025] Furthermore, the particle size of the silica gel powder is 300-400 meshes.

[0026] From the above description, we can know that the particle size of silica gel powder is small, which improves its dispersibility in water-based polyurethane emulsion. The anti-sublimation slurry is applied by screen printing, and the screen printing screen usually uses 80 or 120 mesh gauze, so the smaller the particle size of silica gel powder, the less likely it is to clog the screen.

[0027] Another technical solution adopted by the present invention is: the preparation method of the above-mentioned anti-sublimation slurry comprises the following steps: adding an aqueous polyurethane emulsion, then adding a defoamer and a wetting and leveling agent at a stirring speed of 600 to 700 rpm / min, then adjusting the stirring speed to 1300 to 1500 rpm / min, adding silica gel powder and a dispersant for mixing, and finally adding a thickener to obtain the anti-sublimation slurry.

[0028] From the above description, it can be seen that the mixing effect of silica gel powder and waterborne polyurethane emulsion is lower than that of waterborne polyurethane emulsion and additives, so the stirring speed needs to be appropriately increased before adding silica gel powder. Too low stirring speed will cause uneven slurry and affect coating performance.

[0029] Another technical solution adopted by the present invention is: the application of the above-mentioned anti-sublimation slurry comprises the following steps:

[0030] S1: Apply primer on the fabric to form a base layer after drying;

[0031] S2: Mixing the anti-sublimation slurry with a curing agent and applying the mixture on the primer layer to form an anti-sublimation layer after drying;

[0032] S3: Printing a print layer on the anti-sublimation layer.

[0033] From the above description, it can be seen that the water-based polyurethane in the anti-sublimation slurry has excellent bending resistance and wear resistance, which can improve the corresponding performance of the anti-sublimation layer, and obtain an anti-sublimation layer with good anti-sublimation effect, no influence on the printing color and good bending resistance and wear resistance.

[0034] Furthermore, the added amount of the curing agent is 3-5 wt % of the weight of the anti-sublimation slurry.

[0035] Furthermore, the drying temperature of S2 is 70-80°C.

[0036] From the above description, it can be seen that if the drying temperature is too high, the molecular chain will break and the molecular weight of the resin will decrease. If the drying temperature is too low, the curing speed will slow down and affect mass production.

[0037] Furthermore, the primer slurry is a water-based polyurethane slurry:

[0038] From the above description, it can be seen that the waterborne polyurethane slurry forms excellent chemical adhesion with the fabric and the anti-sublimation layer, thereby improving the peel strength and washing fastness of the base layer.

[0039] Embodiment 1 of the present invention is: an anti-sublimation slurry, comprising 55g of polyether polyurethane emulsion, 30g of silica gel powder with a particle size of 300-400 meshes, 0.2g of mineral oil defoamer, 0.5g of polyether leveling agent, 0.6g of polyvinyl pyrrolidone dispersant and 3g of thickener.

[0040] Embodiment 2 of the present invention is: a method for preparing an anti-sublimation slurry, comprising the following steps: adding 55 g of a polyester polyurethane emulsion, and then sequentially adding 0.2 g of a mineral oil defoamer and 0.5 g of an acrylic leveling agent at a stirring speed of 600 rpm / min, and then adjusting the stirring speed to 1300 rpm / min, adding 30 g of a silica gel powder having a particle size of 300 to 400 meshes and 0.5 g of a polyvinyl pyrrolidone dispersant and stirring for 10 min, and finally adding 3 g of a thickener and stirring for 5 min to obtain an anti-sublimation slurry.

[0041] Embodiment 3 of the present invention is: a method for preparing an anti-sublimation slurry, comprising the following steps: adding 60 g of aliphatic polyurethane emulsion, and then sequentially adding 0.4 g of a polysiloxane defoamer and 1 g of a polyether modified polysiloxane leveling agent at a stirring speed of 700 rpm / min, and then adjusting the stirring speed to 1500 rpm / min, adding 35 g of silica gel powder with a particle size of 300 to 400 meshes and 0.7 g of a polyvinyl pyrrolidone dispersant and stirring for 10 min, and finally adding 5 g of a thickener and stirring for 5 min to obtain an anti-sublimation slurry.

[0042] Embodiment 4 of the present invention is: a method for preparing an anti-sublimation slurry, the steps are as follows: add 350g Anhui Dawei Huatai AH-1802A polyurethane emulsion, and then add 1.75g ​​Dow AFE-1520 defoamer and 1.75g ​​BYK-333 leveling agent in sequence at a stirring speed of 650rpm / min, and then adjust the stirring speed to 1400rpm / min, add 30-35g of Bangkai chromatography silica gel powder with a particle size of 300-400 mesh and 0.6g of Ames PVP-K17 dispersant and stir for 10min, finally add 3.5g Dow RM2020 thickener and stir for 5min to obtain an anti-sublimation slurry with a viscosity of 95mPa·s, and the viscosity of the finished product after one day is 180mPa·s.

[0043] The fifth embodiment of the present invention is: the application of the anti-sublimation slurry in the fourth embodiment, the steps are as follows:

[0044] S1: Screen printing an aromatic polyurethane emulsion with a thickness of 0.1 mm on a black base cloth 4, and drying at 70-80° C. until the surface is dry to form a base layer 3;

[0045] S2: 100 g of anti-sublimation slurry was mixed with 4 g of isocyanate curing agent (manufacturer: Wanhua, model HMDI) to obtain a mixed slurry; the mixed slurry was screen-printed on the base layer 3 with a screen printing thickness of 0.05 mm, and dried at 75° C. until the surface was dry to form an anti-sublimation layer 2;

[0046] S3: printing a printed layer 1 on the anti-sublimation layer 2, with a printing thickness of 0.05 mm, and then drying at 75° C. for 90 min until completely dry to obtain a printed cloth;

[0047] Please refer to the structure of printed fabric Figure 1 , from top to bottom are a printing layer 1, an anti-sublimation layer 2, a base layer 3 and a base fabric 4.

[0048] Comparative Example 1 of the present invention is:

[0049] The only difference between Comparative Example 1 and Example 5 is that the silica gel powder is replaced with activated carbon of the same weight and particle size.

[0050] Comparative Example 2 of the present invention is:

[0051] The only difference between Comparative Example 2 and Example 5 is that Anhui Dawei Huatai AH-1802A polyurethane emulsion is replaced by polyacrylic acid emulsion (Dow, PRIMAL NW-5118) of equal quality.

[0052] The printed cloths prepared in Example 5, Comparative Example 1 and Comparative Example 2 were tested for hot pressing anti-sublimation, constant temperature and humidity anti-sublimation, water washing resistance and flexibility resistance. The test results are shown in Table 1.

[0053] Among them, the test method for hot pressing sublimation resistance is: use Gellowen G247 ironing resistance / sublimation color fastness tester, set the temperature to 180℃ and the pressure to 4KPa for 60S.

[0054] The constant temperature and humidity anti-sublimation test method is: place the printed cloth in a constant temperature and humidity test machine, set the temperature to 180°C and the relative humidity to 90%, and leave it for 2 days.

[0055] Table 1

[0056]

[0057] In summary, the anti-sublimation slurry provided by the present invention and its preparation method and application have the following advantages:

[0058] 1. The color of the anti-sublimation layer is transparent and does not affect the color of the printing layer on the anti-sublimation layer.

[0059] 2. The anti-sublimation slurry uses silica gel powder as an adsorbent. Silica gel powder has strong adsorption capacity and can effectively prevent the color particles of the cloth from contaminating the color of the printing layer.

[0060] 3. When applying, choose a primer slurry with added water-based polyurethane. Since both the anti-sublimation slurry and the primer slurry are added with water-based polyurethane, the anti-sublimation layer and base layer formed by the two have high fastness, good peeling strength, and excellent water washing resistance and wear resistance.

[0061] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An anti-sublimation slurry, characterized in that: Calculated by weight, it comprises 55-60 parts of waterborne polyurethane emulsion and 30-35 parts of silica gel powder.

2. The anti-sublimation slurry according to claim 1, characterized in that: The invention also includes an auxiliary agent, which includes at least one of a defoamer, a wetting and leveling agent, a dispersant and a thickener.

3. The anti-sublimation slurry according to claim 2, characterized in that: Calculated by weight, the auxiliary agent includes 0.2 to 0.4 parts of defoamer, 0.5 to 1 parts of wetting and leveling agent, 0.4 to 0.7 parts of dispersant and 3 to 5 parts of thickener.

4. The anti-sublimation slurry according to claim 3, characterized in that: The defoamer is a mineral oil defoamer or a polysiloxane defoamer.

5. The anti-sublimation slurry according to claim 3, characterized in that: The wetting and leveling agent is at least one of a polyether leveling agent, an acrylate leveling agent and a polyether-modified polysiloxane leveling agent.

6. The anti-sublimation slurry according to claim 1, characterized in that: The aqueous polyurethane emulsion includes at least one of polyether polyurethane, polyester polyurethane, aliphatic polyurethane and aromatic polyurethane.

7. The anti-sublimation slurry according to claim 1, characterized in that: The particle size of the silica gel powder is 300-400 meshes.

8. The method for preparing the anti-sublimation slurry according to any one of claims 1 to 7, characterized in that: The following steps are involved: Aqueous polyurethane emulsion is added, and then a defoamer and a wetting and leveling agent are added at a stirring speed of 600-700 rpm / min, and then the stirring speed is adjusted to 1300-1500 rpm / min, silica gel powder and a dispersant are added and mixed, and finally a thickener is added to obtain an anti-sublimation slurry.

9. The use of the anti-sublimation slurry according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Apply primer on the fabric to form a base layer after drying; S2: Mixing the anti-sublimation slurry with a curing agent and applying the mixture on the primer layer to form an anti-sublimation layer after drying; S3: Printing a print layer on the anti-sublimation layer.

10. The use according to claim 9, characterized in that: The added amount of the curing agent is 3-5 wt % of the weight of the anti-sublimation slurry.

Images