WO2013064010A1 - Pretreatment liquid for cold transfer digital inkjet printing and application method thereof - Google Patents

Abstract

Disclosed are a pretreatment liquid for cold transfer digital inkjet printing and application method thereof. The pretreatment liquid for cold transfer digital inkjet printing comprises pesudoplastic etherified starch with rheological behavior, alkaline agent, urea and water. In the rotary screen sizing process, a fabric to be printed is treated by the pretreatment liquid and then closely bonded with a digital inkjet transfer printing medium, and jet-printing patterns are transferred from the medium to the fabric by using a transfer printing machine. The pretreatment liquid can effectively prevent transfer of dyes to the inside of the fabric to increase the surface dye-uptake rate of the fabric. In case of the same ink amount, the color of the product is deeper than that of the conventional cold-transfer printing.

Description

 Cold transfer digital inkjet printing pretreatment liquid and use method thereof

Technical field

 The invention relates to a printing auxiliary used in the textile printing industry, in particular to a cold transfer digital inkjet printing pretreatment liquid and a using method thereof. In the cold transfer digital inkjet printing process, the printed fabric is processed by the pretreatment liquid, and is closely combined with the digital inkjet printed cold transfer printing paper medium, and the printing pattern is transferred from the paper medium by the transfer printing machine. Printed on the fabric.

 Background technique

 Cold transfer digital inkjet printing is a new technology that combines cold transfer printing with digital inkjet printing. If the current cold transfer printing method is adopted, that is, in the same manner as the normal printing sample by pattern design, plate making, engraving, etc., the dye ink is printed on the transfer printing paper by the printing machine, and the dye ink on the printing paper is transferred. The pattern is transferred to the printed textiles, and the large samples can be officially printed after confirmation by the customer. This results in time-consuming and energy-intensive production, and environmental and economic costs are high. To this end, we have developed cold transfer digital inkjet printing that can be used not only for cold transfer printing proofing, but also for the growing demand for small batches of multi-variety products on the market. The process of cold transfer digital inkjet printing is as follows: After the paper is coated, the dye ink is sprayed directly onto the transfer paper from the inkjet printer to form a cold transfer inkjet paper. The cold transfer inkjet paper is transferred onto the fabric by a transfer machine, and is fixed by a fixing water to produce a finished printed fabric. Because the color management software mainly manages the ink for digital cold transfer printing, it solves the short delivery time, short batch production and reduced small-volume orders, meets the specialization of products, richer design, more color, More complex patterns and ecological requirements are in demand.

Compared with digital direct jet printing, cold transfer digital inkjet printing solves the problem of digital jet nozzles in the inkjet printing process of jacquard fabrics and fabrics with strong concavo-convex styles, due to fiber batt and slurry powder. The problem that the nozzle is prone to blockage. Moreover, the digital inkjet cold transfer printing paper is used as an ink carrier, and its density is much larger than that of the fabric, so that a higher ink dot than a direct printing fabric and a more precise color can be obtained. After the pattern is transferred, the cloth surface can obtain higher color distribution and pattern precision. However, compared to digital direct jet printing, in the past process, the cold transfer digital inkjet printing was due to the pre-treatment liquid of the fabric after the transfer process. It is wet after the treatment, so the pigment has a strong permeability to the fabric during transfer, which results in a low color on the surface of the fabric. Under the same amount of ink, the color of the cold transfer digital inkjet printing surface is shallower than that of the direct jet printing. In order to solve this problem, we have developed a cold transfer digital inkjet printing pretreatment solution, so that most of the dye remains on the surface of the fabric during cold transfer, and the back side is not permeable, so that it can be lifted under the same amount of ink. The color depth of the printed product.

 Summary of the invention

 In order to solve the problem that the cold transfer digital inkjet printing surface color is shallower than the direct jet printing under the same ink amount, the present invention provides a cold transfer digital inkjet printing pretreatment liquid and a method of using the same.

 In one aspect of the invention, a cold transfer digital inkjet printing pretreatment liquid is provided, the pretreatment liquid comprising: a pseudoplastic rheologically etherified starch 3 to 8 wt%, an alkali agent 1 to 3 wt%, urea

0. 2 ~ 0. 8wt%, adjusted to 100 wt% with water; wherein wt% is based on the total weight of the pretreatment agent. In the above formula, the pseudoplastic rheological etherified starch is a pseudoplastic rheological hydroxyalkyl etherified starch, or a carboxymethyl etherified starch; the hydroxyalkyl etherified starch may be a methylol etherified starch, hydroxyethyl ether. Starch, or hydroxypropyl etherified starch. The alkaline agent is a sodium hydrogencarbonate, or sodium carbonate, or a combination system of the two. Urea is of industrial grade purity and distilled water or deionized water.

 The cold transfer digital inkjet printing pretreatment liquid preparation method: first adding 3 ~ 8 wt% of modified starch into an appropriate amount of aqueous solution container, and stirring at a temperature of 600 ~ 800 rpm for about 45 minutes at room temperature using a stirrer~ 3 hours (for example, about one hour), then add 1-3 wt% of alkali agent and 0.2 to 0.8 wt% of urea, adjust to 100 wt% with water, and stir to prepare cold transfer digital inkjet printing pretreatment. liquid. The pH was 8. 8 ~ 9. 6, and the NDJ-5S rotational viscometer was tested at 22 士. The viscosity was 5000 ~ 18000mpa · s at 6rpm and the viscosity was 1500 ~ 2300mpa · s at 60rpm. The optimised formulation of the cold-transfer digital inkjet printing pretreatment liquid of the present invention is: 6. 0 wt% of pseudoplastic rheologically modified etherified starch, 1. 6% sodium hydrogencarbonate + 0.2 sodium, 0. 5^^ % urea,

1. 7wt% water. The singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the s. Sodium bicarbonate and 0.2 wt% sodium, and 0.5 wt% urea, adjusted to 100 wt% with water, and stirred to make up. In another aspect of the invention, there is provided a method of using the cold transfer digital inkjet printing pretreatment liquid described above:

In use, the cold transfer digital inkjet printing pretreatment liquid is poured into a slurry tank container of a cold transfer printing machine pretreatment device, and the printed fabric is subjected to a blade coating treatment using a rotary screen type sizing device. Then, the pre-processed cold transfer printing fabric and the cold transfer inkjet printing paper are closely combined, and the transfer device of the cold transfer printing machine realizes cold transfer digital inkjet printing. The pre-treatment liquid is coated on the surface of the fabric by a circular net pulp method. The sizing equipment can adopt a rotary screen of 80 ~ 155 mesh, and the working pressure of the scraper is adjusted according to the speed of the vehicle. According to the thickness and weight of the fabric, the sizing amount is 30-80 g/m ² . . The invention has the beneficial effects that the above-mentioned pre-liquid is coated on the surface of the printed fabric by using a round-web slurry method, so that the modified starch in the pre-treatment liquid is concentrated on the surface layer of the fabric, thereby effectively preventing the dye from migrating into the interior of the fabric, so that the surface of the fabric The color yield is increased, and the product color depth is deepened under the same amount of ink. Experiments have shown that the pretreatment liquid of the present invention and the method of use are compared with the pretreatment liquid of the patent application No. 200810034437. 1 by the pretreatment apparatus of the patent application No. 200920066843. Pre-treatment, the same batch of cold transfer digital inkjet transfer paper, the same kind of fabric, after transfer, the surface color yield increased by more than 20%. In addition, the pretreatment liquid of the present invention is a pseudoplastic fluid. Therefore, when the round pulp machine is stopped, the pretreatment liquid is not subjected to the shearing force, the viscosity is increased, and the rotting phenomenon does not occur, and after the rotary machine is turned on, The pretreatment liquid is subjected to a shearing force, so that the viscosity becomes small and it is easy to sizing.

 The determination of the difference in the amount of color is determined by the color matching method of the computer color measurement system, and is prepared by the patent application No. 200810034437. 1, the first example of the "chelating adsorbent for cold transfer printing and its use method". The pretreatment liquid, and the pretreatment device described in the patent application No. 200920066843. 6, entitled "Regular pretreatment device for cold transfer printing machine", that is, the fabric is pretreated by padding, and the product produced is The color yield of the standard was measured, and the color yield of the product produced by pretreating the fabric using the pretreatment liquid of the present invention and the method of use was measured.

In the following, the invention will be further illustrated by way of non-limiting examples. However, it should be noted that these examples are not to be construed as limiting the invention. Detailed ways

 Example: The cold transfer digital inkjet printing pretreatment liquid 1 of the present invention, consisting of 6. (1% of a pseudoplastic rheology hydroxypropyl etherified starch; 1. 6 wt% of sodium bicarbonate + 0.2 Sodium sodium; 0. 5wt% urea; 91. 7wt% water composition.

 Preparation method: 6. Owt% of pseudoplastic rheology hydroxypropyl etherified starch was added to a certain amount of water, and stirred at room temperature for about 1 hour at a rotation speed of about 700 rpm. Then, after adding 1. 6 wt% of sodium hydrogencarbonate and 0.2 wt% of sodium and 0.5 wt% of urea, and finally adjusting to 100 wt% with water, which is formulated into a cold transfer digital inkjet printing pretreatment liquid. .

 The cold transfer digital inkjet printing pretreatment liquid has a pH value of 9.0, and is tested by an NDJ-5S rotational viscometer under the condition of 22 ± 2*€, the viscosity at a rotation speed of 6 rpm is about 12,500 mPa·s, and the rotation speed is 60 rpm. The viscosity is about 2000 mpa · s.

 2重量%的碳酸溶液的质量; 2. 2wt% of sodium carbonate sodium carbonate; 2. 8wt% of sodium carbonate; 0. 7wt% Urea

93. 5wt% water composition.

 Preparation method: Add 3. 0wt% of pseudoplastic rheological carboxymethyl etherified starch to a certain amount of water, room temperature ^! ^, at a speed of about 600 rpm, stir well for 1 hour. Then add 2. 8 wt% sodium carbonate; and 0.7 wt% urea, and finally adjust the water to 100 wt%, which is formulated into a cold transfer digital inkjet printing pretreatment liquid.

 The cold transfer digital inkjet printing pretreatment liquid has a ρΗ value of 9.5, and is tested by an NDJ-5S rotational viscometer under the condition of 22 ± 2*€, the viscosity at a rotation speed of 6 rpm is about 8000 mPa·s, and the rotation speed is 60 rpm. The viscosity is about 1700 mpa · s.

 The present invention is a cold transfer digital inkjet printing pretreatment liquid 3, from 8 wt% of pseudoplastic rheological methylol etherified starch; 1. 2 wt% sodium bicarbonate; 0.2 wt% urea;

91. 6wt% water composition.

 Preparation method: Add 8wt% of pseudoplastic rheological hydroxymethyl etherified starch to a certain amount of water, room temperature ^! ^, at a speed of about 800 rpm, stir well for 1 hour. Then, 1. 2 wt% of sodium bicarbonate; and 0.2 wt% of urea were added in sequence, and finally water was adjusted to 100 wt%, which was formulated into a cold transfer digital inkjet printing pretreatment liquid.

The cold transfer digital inkjet printing pretreatment liquid has a pH value of 9.8, and in the condition of 22 ± 2*€ The viscosity was measured at rpm with a NDJ-5S rotational viscometer of about 15000 mPa·s at a rotational speed of 6 rpm and a viscosity of about 2200 mPa·s at a rotational speed of 60 rpm.

 Example: 4: cold wt digital inkjet printing pretreatment liquid 4, from 7 wt% of pseudoplastic rheological hydroxyethyl etherified starch; 1. 3 wt% sodium bicarbonate + 0. 6 wt% sodium carbonate 0. 4wt% of urea; 90. 7wt% of water composition.

 Preparation method: 7 wt% of pseudoplastic rheology hydroxyethyl etherified starch was added to a certain amount of water, and stirred at room temperature for about 1 hour at a rotation speed of about 700 rpm. Then, adding 1. 3 wt% of sodium hydrogencarbonate and 0.6 wt% of sodium carbonate; and 0.4 wt% of urea, and finally adjusting to 100 wt% with water, that is, preparing cold transfer digital inkjet printing pretreatment liquid .

 The cold transfer digital inkjet printing pretreatment liquid ρΗ value is ^? ,in? ? Under the condition of ^^^, the viscosity was tested at NDJ-5S rotary viscometer at a speed of 6 rpm of about 14000 mpa·s, and at a speed of 60 rpm, the viscosity was about 2100 mpa·s.

Example 5: Use of the cold transfer digital inkjet printing pretreatment liquid of the present invention One of the fabrics to be printed: Cotton fabric 120g/m ²

The cold transfer digital inkjet printing pretreatment liquid prepared in Example 4 was placed in a slurry tank container of a cold transfer printing machine pretreatment apparatus. The pretreatment liquid is applied to the surface of the printed cotton fabric by a 105-mesh round-web pulping apparatus, and the coating amount is about 45 g/m ² , and the pre-treated cold transfer printing fabric and the cold transfer inkjet printing paper are further processed. The transfer device of the cold transfer printing machine realizes cold transfer digital inkjet printing.

Example 6: Method for using the cold transfer digital inkjet printing pretreatment liquid of the present invention. The second printing fabric to be printed: a thin cotton fabric 80 g/m ²

The cold transfer digital inkjet printing pretreatment liquid prepared in Example 1 was placed in a slurry tank container of a cold transfer printing machine pretreatment apparatus. The pretreatment liquid is applied to the surface of the printed cotton fabric by a 125-mesh circular web pulping apparatus, and the coating amount is about 35 g/m ² , and the pre-treated cold transfer printing fabric and the cold transfer inkjet printing paper are further processed. The transfer device of the cold transfer printing machine realizes cold transfer digital inkjet printing.

Example 7: Method for using the cold transfer digital inkjet printing pretreatment liquid of the present invention. Three fabrics to be printed: thick cotton fabric ≥ 150 g/m ² The cold transfer digital inkjet printing pretreatment liquid prepared in Example 2 was placed in a slurry tank container of a cold transfer printing machine pretreatment apparatus. The pretreatment liquid is applied to the surface of the printed cotton fabric by an 80-mesh round-web pulping apparatus, and the coating amount is about 75 g/m ² , and the pre-treated cold transfer printing fabric and the cold transfer inkjet printing paper are further processed. The transfer device of the 3⁄4V cold transfer printing machine achieves cold transfer digital inkjet printing.

Claims

Rights request A cold transfer digital inkjet printing pretreatment liquid, comprising: a pseudoplastic rheologically etherified starch 3 - 8 wt%, an alkali agent l ~ 3 wt%, a urea 0. 2 ~ 0. 8 wt%, adjusted to 100 wt% with water Where ^^% is based on the total weight of the pretreatment liquid.  2. A cold transfer digital inkjet printing pretreatment liquid consisting of pseudoplastic rheologically etherified starch, alkali agent, urea and water, characterized in that: 3 to 8 wt% of pseudoplastic rheological etherified starch is added to 〜0. 8wt%的尿素的水。 With a suitable amount of aqueous solution, at room temperature, stir at 600 ~ 800 rpm for 45 minutes to 3 hours, then add 1 ~ 3 ^ ^% of the alkali agent and 0. 2 ~ 0. 8wt% of urea, water Adjust to 100 wt%, stir to make a cold transfer digital inkjet printing pretreatment solution.  3. A cold transfer digital inkjet printing pretreatment liquid consisting of pseudoplastic rheologically etherified starch, alkali agent, urea and water, characterized in that: 3 to 8 wt% of pseudoplastic rheologically modified etherified starch is added to In an appropriate amount of aqueous solution, the mixture is stirred at a temperature of 600 to 800 rpm for one hour at room temperature, and then added with 1 to 3% by weight of an alkali agent and 0.2 to 0.8% by weight of urea, adjusted to 100 wt% with water. %, stirred to make a cold transfer digital inkjet printing pretreatment solution.  4. The cold transfer digital inkjet printing pretreatment liquid according to claim 1, 2 or 3, wherein: the pseudoplastic rheological etherified starch is a pseudoplastic rheological hydroxyalkyl etherified starch, or a carboxy group. Methyl etherified starch; the hydroxyalkyl etherified starch is methylol etherified starch, hydroxyethyl etherified starch, hydroxypropyl etherified starch.  5. The cold transfer digital inkjet printing pretreatment liquid according to claim 1, 2 or 3, wherein: the alkali agent is a compound system of sodium hydrogencarbonate or sodium carbonate, or sodium hydrogencarbonate and sodium carbonate. .  6. The cold transfer digital inkjet printing pretreatment liquid according to claim 1, 2 or 3, wherein: the material is of industrial grade purity, and the water is distilled water or deionized water.  5 至 9. 6, The pH of the cold transfer digital inkjet printing pretreatment liquid is 8. 8 ~ 9. 6, Under the condition of 22 士, the viscosity was measured with an NDJ-5S rotational viscometer at a speed of 6 rpm of 5000 to 18000 mPa·s, and the viscosity at 60 rpm was 1500 to 2300 mPa·s. 8. The cold transfer digital inkjet printing pretreatment liquid according to claim 1, 2 or 3, which The utility model is characterized in that: the pre-treatment liquid of the cold transfer digital inkjet printing is to add 6%% of the pseudoplastic rheological hydroxypropyl etherified starch to an appropriate amount of the aqueous solution container, and at a room temperature, using a stirrer After stirring at a speed of about 700 rpm for 1 hour, 1.6 wt% of sodium hydrogencarbonate and 0.2 wt% of sodium carbonate, and 0.5 wt% of urea were added, adjusted to 100 wt% with water, and the composition was stirred.  9. A method of using a cold transfer digital inkjet printing pretreatment liquid according to any one of claims 1-8, wherein: said cold transfer digital inkjet printing pretreatment liquid is poured into a cold transfer printing In the sump container of the pre-treatment device, the printed fabric is subjected to a squeegee treatment using a rotary squeegee type sizing apparatus, and the rotary net is 80 - 155 mesh. 10. The method according to claim 9, wherein when the printed fabric is a cotton fabric, the amount of the pretreatment liquid is 30 to 80 g/m. ² .