JPH0140153B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to sodium carboxymethylcellulose (hereinafter abbreviated as CMC), which is a type of printing paste, and has level dyeing properties, screen permeability, and properties that cannot be obtained with conventional CMC printing pastes. The aim is to provide a printing paste with excellent workability. Currently, the main printing methods in the textile printing industry are roller printing, rotary screen printing,
Flat screen printing methods, transfer printing methods, etc. are used. As the materials to be printed, patterns, and designs become more differentiated, printing is increasingly being carried out in small lots of a wide variety of products, and moreover, using advanced processing techniques. In response to these industry trends, the flat screen printing method is most suitable and has become the mainstream. Flat screen printing methods include the automatic flat screen method, the traveling flat screen method, and the hand flat screen method, listed in descending order of processing speed, but the automatic flat screen method has the highest processing output. This automatic flat screen printing method is often a wet-on-wet process to increase processing speed. For this reason, problems such as "embossment", "mitsutiya", and reduced sharpness of picture edges are likely to occur, especially when processing fabrics to be printed on books. I am trying to solve the problem. On the other hand, the materials and patterns/designs of dyed fabrics are constantly changing due to changes in fashion. are becoming more common. Such printing is particularly prone to problems in level dyeing properties, and therefore there is a demand for the improvement and development of printing pastes that have good level dyeing properties and a high color value. Commonly used printing pastes include starch, British gum, dextrin, guar gum, locust bean gum, tamarind crystal gum, tragacanth gum, sodium alginate, CMC,
and their derivatives, emulsion obtained by emulsifying mineral spirits and mineral oil with an emulsifier, natural, semi-synthetic, and synthetic thickening materials such as sodium polyacrylate and polyvinyl alcohol.
They are used alone or in combination of two or more depending on the purpose of printing. The performance required of a printing paste is, first of all, to provide viscosity in order to faithfully draw the desired pattern or design on the dyed fabric, and to allow the dye to deviate from the dyed fabric even after printing has dried. It has an adhesion ability that allows it to be held without any damage. Next, when fixing the dye, the coloring effect is not inhibited, the color value is high, and the coloring is uniformly dyed with good level dyeing properties without causing so-called "dying spots" or "irritations". After that, it can be easily washed and removed from the dyed fabric. In addition, sharpness and permeability are important printing performance, although they may or may not be required depending on the purpose of printing. In the case of flat autoscreen printing, it is important that continuous operation is possible without clogging the screen. CMC can be made to have various fluidity properties by changing the degree of etherification and substituent distribution, and it is also possible to use the high temperature and normal pressure continuous steaming method (hereinafter abbreviated as HTS method), which is becoming the mainstream dye fixing process. )
This CMC is said to be second only to the expensive sodium alginate glue in terms of desizing properties, which are a particular issue in the industry. It is widely used as a sizing agent for printing synthetic fiber products. The degree of etherification of CMC as a printing sizing agent is
0.45-1.5 mol/anhydroglucose unit (hereinafter referred to as
(abbreviated as M/C ₆ ), those below 0.45M/C ₆ have low viscosity and are unsuitable for printing pastes, while those above 1.5M/C ₆ are expensive to manufacture. It is impractical. The higher the degree of etherification, the more it approaches a Newtonian fluid and has slipping properties, improving permeability, but the color value decreases. On the other hand, the lower the degree of etherification, the more plastic the fluid becomes and becomes a so-called "sakui" glue, which suppresses the permeability and improves the color value. In addition to CMC, starch, starch derivatives, mineral oil emulsions, etc. are used as glues that exhibit this plastic fluid, and they are often used for the purpose of obtaining color values, but each has its own drawbacks, and none of them have perfect performance. Doesn't exist.
For example, starch-based sizing agents are inexpensive, but their desizing properties in the HTS method are significantly inferior. Mineral oil emulsions do not form a film when dry, so they do not have the ability to attach dyes to fibers, and they also have a strong odor that degrades the working environment. On the other hand, CMC has good desizing properties using the HTS method and has film-forming properties, but as the degree of etherification becomes lower, the presence of unreacted fibers called free fibers is unavoidable, and it is completely resistant to water. The number of swollen gel particles that do not dissolve in the water increases, resulting in microscopic "dye spots".
It causes "irritability" and reduces level dyeing. Especially in the case of dyed fabrics with large patterns or patterns, this level dyeing property is very important. Dyed fabrics with poor level dyeing properties have lower commercial value. Therefore, the industry is striving to improve level dyeing, even by using expensive chemicals called leveling agents. Furthermore, the presence of free fibers and swollen gel particles causes clogging of the screen, that is, worsens the size liquid permeability of the screen, making continuous operation impossible and reducing productivity. Therefore, use a low-grid screen with large screen spacing. This screen permeability becomes a particular problem when printing fabrics made of water-soluble fibers, such as polyester dioset, which have a low ability to absorb the amount of printing paste, and require sharpness of the edges. When double-color or triple-color printing is performed on the printed fabric using the wet-on-wet process using a flat auto screen, the amount of printing glue is twice or three times that of a single color, and the amount of printing paste is There is no problem if the glue is absorbed, but
If the absorbing capacity of the glue is low, problems such as "mold clumping" and "mitsutiya" will occur, resulting in unclear edges and a significant loss of product value. Therefore, the problem can be solved by adjusting the squeegee pressure, angle, and hardness to reduce the amount of printing paste, but a more reliable method is to select a screen. The amount of printing glue is determined by the screen thickness, density, mesh spacing, and aperture rate. becomes less. The high-count screens commonly used today often refer to those with 150 mesh or more. When printing with a high-count screen of 150 mesh or more, using low to medium degree of etherification CMC, which has a high color value and good desizing properties, is a free fiber that affects level dyeing. The swollen gel particles tend to clog the screen, causing white dots to appear and causing unsatisfied results, and the number of times the screen is washed increases, reducing workability and productivity. The present invention exhibits plastic fluidity and provides a high color value. Etherification degree 0.45-0.9M/ _C6 ,
Preferably 0.45~0.8M/ _C6 CMC powder unparticle size is 61μ
By setting the content of 37μ or less to 95% or more, preferably 97% or more, free fibers and swollen gel particles become smaller, screen permeability improves, and leveling properties are significantly improved. It is characterized by this. That is, the present invention provides a sizing agent that satisfies color value, level dyeing property, and screen permeability at the same time. Generally, CMC with a degree of etherification of 0.45 M/C ₆ or less has low viscosity and is not suitable as a main sizing agent for textile printing, so it is not used. Also the degree of etherification
CMC with a value of 0.9M/C ₆ or higher has excellent sliding properties and good permeability into the printed fabric, resulting in a low color value and is not suitable as a sizing agent for the purpose of obtaining a color value. Level dyeing and screen permeability are improved, so CMC with a degree of etherification of 0.9M/C6 or _higher does not need to be crushed. The present invention does not particularly limit the degree of polymerization and purity of CMC. The effects of the present invention will be explained below using Examples. Examples Sample specifications are as shown in Table 1.

【table】

[Table] A-1, A-2, and A-3 shown in Table 1 have different particle size distributions obtained by re-pulverizing sample a with a normal powder particle size in a vibrating ball mill at different times. It is something. Dissolve each of them in water to prepare base glue so that the color paste becomes 5000 cps, and the base glue is 65
% (below % indicates weight %) and disperse dye Kayalon
Polyester Navy Blue R-SF2%, sodium chlorate 1%, malic acid 0.5%, warm water (50℃) 31.5
% was mixed, stirred, and dissolved to make colored paste. This was printed on polyester jersey cloth using a flat auto screen test machine with a 180 mesh polyester screen, and after air drying, it was printed on HTS.
It was steamed at 175°C for 5 minutes and washed with water. After washing with water,
One part was air-dried to be used as a sample for evaluation of desizing properties, and the other part was prepared by adding 1 g of loading soda and 1 g of hydrosulfite to 2 g of sodium alkylbenzenesulfonate at 80℃ for 10 minutes. After scouring, it was washed again with water, air-dried, and finished with an iron. Desizing property was evaluated by texture, level dyeing property was evaluated by visual observation, color value was quantified using a reflectance meter, and comparison was made with sample a as 100. Screen permeability was determined by diluting each base glue with water using a 200 mesh polyester screen with an area of 100 cm ² .
1000 g of size liquid adjusted to 600 cps was filtered naturally, and the amount until no size liquid was filtered was measured. As shown in the results shown in Table 2, A-2 and A have a total particle size of 61μ or less and 95% or more of particles of 37μ or less.
-3 had no deterioration in desizing properties, surface coloring density, and was excellent in level dyeing properties and screen permeability.

[Table] Example 2 The BCDEs shown in Table 1 have a normal powder particle size and have different degrees of etherification and polymerization.
The total amount of CMC is reduced to a particle size of 61μ or less using a pot mill.
What's more, it has been pulverized until more than 95% of the material is less than 37μ. These were printed in the same manner as in Example 1 and the performance was evaluated, and the results are shown in Table 3.
As a comparative example, etherified guar gum was shown and its color value was set to 100. Etherification degree 0.45~
The CMC powder particle size of 0.9M/C ₆ is 61μ or less and 95% or more of 37μ or less has no inferiority in color value and desizing performance compared to normal powder particle size products. , the level dyeing property and screen permeability were significantly improved. For E with a degree of etherification of 0.9M/C ₆ or more, no effect of the powder size was observed.

[Table] Example 3 The FGs shown in Table 1 are CMCs with the same degree of etherification and degree of polymerization but different purity, and each of the FGs of normal particle size was crushed to 61 μm using an air-flow type crusher. It is crushed until 95% or more of it is 37μ or less. Printing and color development were carried out in the same manner as in Example 1, and the performance was evaluated. The results are shown in Table 4, and the re-ground product showed good level dyeing properties and screen permeability.

[Table] Example 4 In Example 1, the acid dye Suminol Milling Black 8BX1% was used instead of the disperse dye,
The performance was evaluated by printing on nylon cloth. Steam heat is
The results of the test at 130°C for 30 minutes are shown in Table 5. Similar to Example 1, A-
2. A-3 had excellent level dyeing properties.

【table】

Claims (1)

[Claims] 1 The particle size of sodium carboxymethyl cellulose with a degree of etherification of 0.45 to 0.9 mol/anhydroglucose unit is at most 61μ or less;
A printing paste in which 95% by weight or more is 37μ or less.