A transfer film using cationic digital ink and printing process for acrylic

Abstract

The application discloses a transfer film using cationic digital ink, which comprises a carrier, an ink receiving layer and a protective layer from bottom to top, wherein the thickness of the ink receiving layer is 1-5 mu m, and the thickness of the protective layer is 1-3 mu m. The polyvinyl alcohol with an average molecular weight of 130-160 thousand Da and the polyurethane resin dispersion are used together to improve the color luster of the film after transfer, increase the dye uptake rate, and realize the transfer of deep color patterns. The color of the pattern after transfer is bright, the ink can be prevented from penetrating after printing on the fabric, the ink is saved, the fixing effect of the cationic dye on the textile can be realized at a relatively low temperature, and the purpose of saving energy is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a transfer film using cationic digital ink and a printing process for acrylic fabric, belongs to the technical field of C09D, and particularly relates to the field of coating compositions. BACKGROUND

[0002] Transfer printing is a method of printing dyes on a transfer film and then transferring the pattern to the fabric by heat pressing, but acrylic fabric is sensitive to temperature, and the acrylic fabric will yellow due to thermal decomposition when it meets alkali at high temperature, and the acrylic fabric will deform under tension at high temperature, causing permanent creases, reducing the gloss of the fabric, and losing the loftiness of the fabric. Therefore, the use of transfer printing process in acrylic fabric is limited. And the existing transfer printing process mostly uses heat energy to drive transfer printing, which requires high heat pressing temperature and is not friendly to acrylic fabric, and the transfer printing efficiency is low.

[0003] Chinese invention patent CN202010470172.0 discloses a coating composition for PET film, a PET transfer film and a preparation method and application thereof. By introducing polyvinyl butyral, polyvinyl alcohol and coupling agent into the coating, it can be transferred on pure cotton or cotton blended fabric, and after transfer, it does not stick back, has little effect on the use of fabric, and the pattern does not fade or crack. However, the transfer printing temperature is above 150℃, which is not suitable for acrylic fabric. Chinese invention patent CN201110038659.2 discloses a transfer method for fabric or fur quilt pattern, which uses reactive dyes or acid dyes or cationic dyes or ordinary non-sublimation disperse dyes to configure ink, prints on the carrier to make transfer film or transfer paper. Then the transfer film or transfer paper is directly transferred on the fabric or fur to solve the problem that wet transfer cannot be applied to garment printing. However, the temperature of the heat printing process still reaches 120℃, which does not meet the needs of low-temperature transfer printing. SUMMARY

[0004] In order to make the transfer printing have high dyeing rate on acrylic fabric and bright color, the first aspect of the present application provides a transfer film using cationic digital ink, which comprises a carrier, an ink receiving layer and a protective layer from bottom to top, the thickness of the ink receiving layer is 1-5μm, and the thickness of the protective layer is 1-3μm.

[0005] As a preferred embodiment, the thickness of the ink receiving layer is 3μm, and the thickness of the protective layer is 2μm.

[0006] As a preferred embodiment, the raw materials for preparing the ink receiving layer include polyvinyl alcohol 30-40 parts and polyurethane resin 10-15 parts by weight.

[0007] As a preferred embodiment, the average molecular weight of the polyvinyl alcohol is 130-160 thousand Da.

[0008] As a preferred embodiment, the polyurethane resin is selected from one of an aqueous anionic polyurethane dispersion or an aqueous nonionic polyurethane dispersion; the solid content of the polyurethane resin is 35-55 wt%, and the viscosity at 23℃ is 40-600 mPa·s.

[0009] As a preferred embodiment, the polyurethane resin is selected from an aqueous anionic polyurethane dispersion.

[0010] The applicant found in the experiment that when transfer printing is performed on acrylic fabric, the high temperature during printing can cause deformation of the acrylic fabric, resulting in permanent creases, reducing the printing gloss, and losing the loftiness. The applicant can improve the gloss of the printed color after film transfer printing, increase the dye uptake of the dye, and realize the transfer printing of deep color patterns by using cationic digital ink for low-temperature film transfer printing. The possible reason is that the polyvinyl alcohol with a molecular weight of 13-16 million and the polyurethane resin work together to form an ink receiving layer on the surface of the transfer film, increase the receiving amount of the cationic digital ink, and the polyurethane resin is an anionic polyurethane resin with high binding force with the cationic digital ink. By using polyvinyl alcohol with a molecular weight of 13-16 million, the ink absorbed by the polyurethane resin can be prevented from penetrating deep into the transfer film, preventing the transfer film from having low dye uptake when transferring to the acrylic fabric, and affecting the brightness of the transferred pattern. The chemical reaction type driving color transfer avoids the influence of temperature on acrylic, and has high dye uptake and bright color.

[0011] As a preferred embodiment, the protective layer is an inorganic oxide suspension, the particle size of the inorganic oxide is 1-3 μm, and the suspension rate of the inorganic oxide is 20-35%.

[0012] As a preferred embodiment, the particle size of the inorganic oxide is 1-1.5 μm, and the suspension rate of the inorganic oxide is 25-30%.

[0013] As a preferred embodiment, the inorganic oxide suspension is selected from one or a combination of several of a silicon dioxide suspension, an aluminum oxide suspension, a calcium oxide suspension, and a calcium carbonate suspension.

[0014] The applicant further found that by attaching a protective layer on the ink receiving layer, the influence of high temperature transfer printing on acrylic fabric can be further reduced, and the shrinkage and deformation of acrylic fabric during heat transfer printing can be prevented. The inorganic oxide suspension with a suspension rate of 25-30% can be uniformly attached to the surface of the ink receiving layer, reducing the waste caused by flowing, and being beneficial to subsequent drying processing.

[0015] As a preferred embodiment, the substrate is a PET substrate with a thickness of 25 μm, which is commercially available from Shenzhen Senrui Tai Technology Co., Ltd.

[0016] As a preferred embodiment, the preparation process of the transfer film comprises the following steps:

[0017] The ink-receiving layer and the protective layer are successively coated on the substrate, and after drying at 60-80℃, the transfer film is obtained.

[0018] As a preferred embodiment, the raw materials for preparing the cationic digital ink used in the transfer film include, by weight percentage, humectant 20-40%, cationic dye paste 10-20%, surfactant 0.5-1%, pH buffer 1-2%, bactericide 0.1-0.2%, and deionized water to make up the balance.

[0019] As a preferred embodiment, the cationic dye paste has a pH of 3-4, an electrical conductivity of ≤500 uS / cm, a chloride ion content of not higher than 100 ppm, and a sulfate ion content of not higher than 100 ppm.

[0020] As a preferred embodiment, the humectant includes, but is not limited to, one or a combination of ethylene glycol, diethylene glycol, glycerol, dipropylene glycol methyl ether, ethylene glycol butyl ether, and diethylene glycol butyl ether.

[0021] As a preferred embodiment, the humectant is a combination of ethylene glycol and diethylene glycol, preferably, the weight ratio of the ethylene glycol to the diethylene glycol is 1:(1-2); further preferably, the weight ratio of the ethylene glycol to the diethylene glycol is 1:1.

[0022] As a preferred embodiment, the surfactant is a non-ionic surfactant selected from one or a combination of fatty alcohol polyoxyethylene ether and polyether-modified organosilicon.

[0023] As a preferred embodiment, the bactericide includes, but is not limited to, one or a combination of benzotriazole and isothiazolinone.

[0024] As a preferred embodiment, the pH buffer is selected from one or a combination of ethanolamine and tris(hydroxymethyl)aminomethane.

[0025] The second aspect of the present application provides an application of a transfer film using cationic digital ink, which is applied to a film transfer printing process of acrylic fabric.

[0026] As a preferred embodiment, the film transfer printing process of the acrylic fabric comprises the following steps:

[0027] S1 preparing a transfer film;

[0028] S2 preparing cationic digital ink;

[0029] S3 printing the cationic digital ink onto the transfer film;

[0030] S4 drying the printed transfer film at 45-55℃ for 3-8min;

[0031] S5 transferring the dried transfer film to the acrylic fabric to transfer the pattern;

[0032] S6 washing the acrylic fabric with cold water, soaping at 90℃ for 5-10min, and washing with cold water.

[0033] As a preferred embodiment, in the step S5, the transfer conditions are as follows: the transfer temperature is 50-65℃, the pressing time is 1-5min, and the transfer pressure is 0.5-0.8MPa.

[0034] As a preferred embodiment, in the step S5, the transfer conditions are as follows: the transfer temperature is 55-60℃, the pressing time is 2-4min, and the transfer pressure is 0.6-0.7MPa.

[0035] As a preferred embodiment, in the step S5, the transfer conditions are as follows: the transfer temperature is 60℃, the pressing time is 3min, and the transfer pressure is 0.65MPa.

[0036] Compared with the prior art, the present application has the following beneficial effects:

[0037] (1) The transfer film using the cationic digital ink of the present application can improve the color luster after film transfer, increase the dye uptake, and realize the transfer of deep color patterns, by using polyvinyl alcohol with an average molecular weight of 130-160kDa and polyurethane resin dispersion together.

[0038] (2) The transfer film using the cationic digital ink of the present application can improve the rubbing fastness and soaping fastness of the fabric after transfer, and the fabric color is bright, by using water-based anionic polyurethane dispersion and cationic digital ink together.

[0039] (3) The transfer film using the cationic digital ink of the present application can prevent the shrinkage and deformation of the acrylic fabric during heat transfer, and the fabric color fastness is excellent, by using inorganic oxide suspension with a particle size of 1-3μm and a suspension rate of 20-35% as a protective layer, and the processing technology of the transfer film is convenient.

[0040] (4) The transfer film using the cationic digital ink has bright color of the printed pattern, can prevent the ink from penetrating after printing on the fabric, saves the ink, and realizes the fixing effect of the cationic dye on the textile at a relatively low temperature, thereby achieving the purpose of saving energy. DETAILED DESCRIPTION

[0041] Embodiment 1

[0042] A transfer film using a cationic digital ink comprises, from bottom to top, a carrier, an ink receiving layer, and a protective layer, wherein the thickness of the ink receiving layer is 3 μm, and the thickness of the protective layer is 2 μm.

[0043] The raw materials for preparing the ink receiving layer include, by weight, 35 parts of polyvinyl alcohol and 13 parts of polyurethane resin.

[0044] The polyvinyl alcohol has an average molecular weight of 130,000-160,000 Da and a model number of PVA0588.

[0045] The polyurethane resin is an aqueous anionic polyurethane dispersion, has a solid content of 40 wt%, a viscosity of 50-600 mPa·s at 23℃, and a model number of Dispercoll U53, and is purchased from Covestro.

[0046] The protective layer is a silica suspension, the particle size of the silica is 1-1.5 μm, and the suspension rate of the silica is 25-30%, and the silica suspension is purchased from Wuxi Jizhi Electronics Technology Co., Ltd. and has a model number of JZA-S150N.

[0047] The carrier is a PET substrate having a thickness of 25 μm and purchased from Shenzhen Senrui Tai Technology Co., Ltd.

[0048] The preparation process of the transfer film comprises the following steps:

[0049] The ink receiving layer and the protective layer are sequentially coated on the carrier, and the transfer film is obtained after drying at 70℃.

[0050] The raw materials for preparing the cationic digital ink used in the transfer film include, by weight percentage, 30% of a humectant, 15% of a cationic dye paste, 0.8% of a surfactant, 1.5% of a pH buffer, 0.1% of a bactericide, and the balance of deionized water.

[0051] The cationic dye paste has a pH of 3-4, an electrical conductivity of ≤500 uS / cm, a chloride ion content of not higher than 100 ppm, and a sulfate ion content of not higher than 100 ppm.

[0052] The humectant is a combination of ethylene glycol and diethylene glycol, and the weight ratio is 1:1.

[0053] The surfactant is a fatty alcohol polyoxyethylene ether, purchased from Jiangsu Hainan Petrochemical, model E-1003.

[0054] The bactericide is benzotriazole. The pH buffer is ethanolamine.

[0055] The index data of the prepared cationic digital ink are shown in Table 1, and the cationic digital ink is from Zhengzhou Hongsheng Digital Technology Co., Ltd.

[0056] Table 1

[0057]

[0058] An application of a transfer film using cationic digital ink is applied to the film transfer printing process of acrylic fabric, which comprises the following steps:

[0059] S1, preparing a transfer film;

[0060] S2, preparing a cationic digital ink;

[0061] S3, printing the cationic digital ink onto the transfer film;

[0062] S4, drying the printed transfer film at 50℃ for 5min;

[0063] S5, transferring the pattern of the dried transfer film to the acrylic fabric;

[0064] S6, washing the acrylic fabric with cold water, soaping at 90℃ for 5min, and washing with cold water.

[0065] In the step S5, the transfer conditions are as follows: the transfer temperature is 60℃, the pressing time is 3min, and the ironing pressure is 0.65MPa.

[0066] Example 2

[0067] A transfer film using cationic digital ink comprises, from bottom to top, a carrier, an ink receiving layer, and a protective layer, wherein the thickness of the ink receiving layer is 2μm, and the thickness of the protective layer is 1μm.

[0068] The preparation raw material of the ink receiving layer comprises, by weight, 30 parts of polyvinyl alcohol and 10 parts of polyurethane resin.

[0069] The average molecular weight of the polyvinyl alcohol is 130-160 thousand Da, and the model is PVA0599.

[0070] The polyurethane resin is an aqueous anionic polyurethane dispersion, with a solid content of 50wt%, a viscosity of 40-600mPa·s at 23℃, and a brand of Dispercoll U54, purchased from Covestro.

[0071] The protective layer is a silica suspension, the particle size of silica is 1-1.5 μm, the suspension rate of silica is 25-30%, and it is purchased from Wuxi Jiqi Electronic Technology Co., Ltd.

[0072] The substrate is a PET substrate, and the thickness is 25 μm, which is purchased from Shenzhen Senrui Tai Technology Co., Ltd.

[0073] The preparation process of the transfer film comprises the following steps:

[0074] The ink receiving layer and the protective layer are coated on the substrate in sequence, and the transfer film is obtained after drying at 70 ℃.

[0075] The index data of the prepared cationic digital ink are the same as those in Example 1.

[0076] The transfer film using the cationic digital ink is applied to the film transfer printing process of the acrylic fabric, and the steps are the same as those in Example 1. The difference lies in that in the step S5, the transfer conditions are as follows: the transfer temperature is 55 ℃, the pressing time is 4 min, and the printing pressure is 0.7 MPa.

[0077] Example 3

[0078] A transfer film using a cationic digital ink comprises, from bottom to top, a carrier, an ink receiving layer, and a protective layer, wherein the thickness of the ink receiving layer is 5 μm, and the thickness of the protective layer is 3 μm.

[0079] The raw material for preparing the ink receiving layer comprises, by weight, 40 parts of polyvinyl alcohol and 15 parts of polyurethane resin.

[0080] The average molecular weight of the polyvinyl alcohol is 130-160 thousand Da, and the model number is PVA0588.

[0081] The polyurethane resin is an aqueous anionic polyurethane dispersion, the solid content is 40 wt%, the viscosity at 23 ℃ is 50-600 mPa·s, the grade is Dispercoll U53, and it is purchased from Covestro.

[0082] The protective layer is a silica suspension, the particle size of silica is 1-1.5 μm, the suspension rate of silica is 25-30%, and it is purchased from Wuxi Jiqi Electronic Technology Co., Ltd.

[0083] The substrate is a PET substrate, and the thickness is 25 μm, which is purchased from Shenzhen Senrui Tai Technology Co., Ltd.

[0084] The preparation process of the transfer film comprises the following steps:

[0085] The ink receiving layer and the protective layer are coated on the substrate in sequence, and the transfer film is obtained after drying at 70 ℃.

[0086] The index data of the prepared cationic digital ink is same as Example 1.

[0087] The steps of the film transfer printing process of the transfer film using the cationic digital ink applied to the acrylic fabric are same as Example 1. The difference is that in the step S5, the transfer conditions are as follows: the transfer temperature is 58℃, the pressing time is 4min, and the transfer pressure is 0.7MPa.

[0088] Comparative Example 1

[0089] A transfer film using the cationic digital ink, the specific embodiment is same as Example 1, the difference is that the thickness of the ink receiving layer is 1μm, and the thickness of the protective layer is 2μm.

[0090] The protective layer is an alumina suspension, which is purchased from Shanghai Topson Technology Co., Ltd., and the model number is 406377032.

[0091] The average molecular weight of the polyvinyl alcohol is 50000Da, and the model number is PVA100-27, which is purchased from Guangzhou Shenchuang Chemical Co., Ltd.

[0092] Comparative Example 2

[0093] A transfer film using the cationic digital ink, the specific embodiment is same as Example 1, the difference is that the application of the transfer film using the cationic digital ink is applied to the film transfer printing process of the acrylic fabric, which includes the following steps:

[0094] S1: preparing the transfer film;

[0095] S2: preparing the cationic digital ink;

[0096] S3: printing the cationic digital ink on the transfer film;

[0097] S4: drying the printed transfer film at 50℃ for 5min;

[0098] S5: transferring the pattern of the dried transfer film to the acrylic fabric;

[0099] S6: washing the acrylic fabric with cold water, soaping at 90℃ for 5min, and washing with cold water, and then the process is completed.

[0100] The difference is that in the step S5, the transfer conditions are as follows: the transfer temperature is 40℃, the pressing time is 5min, and the transfer pressure is 0.65MPa.

[0101] Performance test

[0102] 1. Color index determination of the printed fabric:

[0103] The apparent color depth K / S value and Lab value of the printed fabric after cleaning were determined by Color i5 computer color matching instrument under the condition of D65 light source and 10° field of view. The sample was folded 3 layers, measured 3 times, and the average value was taken.

[0104] 2. Abrasion color fastness of printed fabric:

[0105] Referring to GB / T 29865-2013 "Textile color fastness test of color fastness to rubbing", the rubbing color fastness instrument was used for testing, and the gray sample card was used for rating.

[0106] 3. Soaping color fastness test of printed fabric:

[0107] The test standard was GB / T3921.3-2008 "Textile color fastness test of color fastness to soaping". The color change fastness grade was evaluated by "gray sample card".

[0108] The test results of Example 1 are shown in Table 2. The color test results of the printed fabric of Comparative Example 1 are shown in Table 3. The color test results of the printed fabric of Comparative Example 2 are shown in Table 4. The test results of Example 2 are shown in Table 5. The test results of Example 3 are shown in Table 6.

[0109] Table 2

[0110]

[0111] Table 3

[0112]

[0113] Table 4

[0114]

[0115]

[0116] Table 5

[0117]

[0118] Table 6

[0119]

[0120] From Tables 2, 3, and 4, it can be seen that the dye uptake of the fabric after transfer printing of Comparative Example 1 is significantly low, and the color is not bright enough; the dye uptake of the fabric after transfer printing of Comparative Example 2 is too low, and the color depth is also shallow.

Claims

1. A film transfer printing process for acrylic fabrics, characterized in that, Includes the following steps: S1: Preparation of transfer film; S2: Preparation of cationic digital ink; S3: Print cationic digital ink onto the transfer film; S4: Dry the printed transfer film at 45-55℃ for 3-8 minutes; S5: The dried transfer film is combined with acrylic fabric to transfer the pattern, and the transfer temperature is 50-65℃. S6: For acrylic fabrics, wash cold water, soap in 90℃ hot water for 5-10 minutes, then wash cold water. In step S1, the transfer film comprises, from bottom to top, a carrier, an ink receiving layer, and a protective layer. The ink receiving layer has a thickness of 1-5 μm, and the protective layer has a thickness of 1-3 μm. The raw materials for preparing the ink receiving layer include, by weight, 30-40 parts of polyvinyl alcohol and 10-15 parts of polyurethane resin. The average molecular weight of the polyvinyl alcohol is 130,000-160,000 Da.

2. The film transfer printing process for acrylic fabrics according to claim 1, characterized in that, The polyurethane resin is selected from either an aqueous anionic polyurethane dispersion or an aqueous nonionic polyurethane dispersion; the solid content of the polyurethane resin is 35-55 wt%, and the viscosity at 23°C is 40-600 mPa·s.

3. The film transfer printing process for acrylic fabrics according to claim 2, characterized in that, The protective layer is an inorganic oxide suspension with a particle size of 1-3 μm and a suspension rate of 20-35%.

4. The film transfer printing process for acrylic fabrics according to claim 3, characterized in that, The inorganic oxide suspension is selected from one or a combination of several of the following: silica suspension, alumina suspension, calcium oxide suspension, and calcium carbonate suspension.

5. The film transfer printing process for acrylic fabrics according to claim 1, characterized in that, The raw materials for preparing the cationic digital ink used in the transfer film, by weight percentage, include: 20-40% humectant, 10-20% cationic dye paste, 0.5-1% surfactant, 1-2% pH buffer, 0.1-0.2% bactericide, and the remainder deionized water.

6. The film transfer printing process for acrylic fabrics according to claim 5, characterized in that, The cationic dye paste has a pH of 3-4, a conductivity of ≤500 uS / cm, a chloride ion content of no more than 100 ppm, and a sulfate ion content of no more than 100 ppm.

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