JPS5841978A - Printing size agent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a paste for textile printing.

As a printing paste, a natural or semi-synthetic water-soluble polymer compound which is an amorphous solid, dissolves in colloidal form in water, and has a high viscosity at a relatively low concentration is used, and is also called a base paste. It is. Printing pastes are printing media that are required to have shape-retaining properties to keep designs fixed on fabrics and faithfully reproduce color images on fabrics. Generally, a size agent is mixed with a dye, an acid, an alkali, a reduction inhibitor, etc. to form a colored paste, and this is used in the printing process.

Water-soluble when the size agent is used as a printing medium.

Heating stability, viscosity stability over time 9 Mechanical stirring stability.

Acid/alkali resistance, salt resistance, antibacterial properties, and reduction resistance.

There are a number of basic requirements for compatibility.

Furthermore, the sizing agent plays an important role as a factor that influences 1tfH performance such as the reproducibility of the image expressed after printing on the cloth, surface coloring, level dyeing, sharpness, and desizing properties.

Conventionally, sizing agents have mainly been starch or its derivatives, sodium alginate, carboxymethyl cellulose (C
Cellulose derivatives represented by MC).

There are natural gums such as galactomannan, which are used depending on the purpose of printing.

On the other hand, rice bran is used in small amounts in paper pattern printing, etc., and its purpose is to adjust the viscosity of rice bran and increase the bulk of the paste. This rice bran has poor solubility and fluidity, and also contains many impurities such as crude protein and oil.
It could not be used for general mechanical printing. In addition, defatted rice bran, or rice bran meal, is a large amount of by-product when extracting rice bran oil from rice bran, but it has almost no effective use other than adding less than 10% to the feed as a compound feed. Ta.

The present inventors have focused on the above-mentioned current state of conventional thickeners and the fact that the use of rice bran is economically advantageous and that its main component is polysaccharide. It has been found that it can be effectively used as a printing paste not only for textile printing but also for general mechanical printing.

The printing paste according to the present invention has an average degree of substitution in terms of purity of 0.
．． The essential ingredient is an alkali metal salt of carboxymethylated rice bran having a carbon atom ratio of 3 or more.

゛ The rice bran in the present invention also includes defatted rice bran, that is, rice bran lees. Rice bran is a mixed powder produced when brown rice is polished, and its main component is polysaccharides. Moreover, defatted rice bran is a residue obtained by extracting bran oil bones from rice bran.

Carboxymethylation of rice bran is usually carried out by treating rice bran with an alkali (especially caustic soda) and adding monochloroacetic acid or sodium monochloroacetate to form an ether bond, similar to the production of CMC or CMS.

In this case, if the polysaccharide is cellulose, the degree of etherification is theoretically 3.0, that is, all three hydroxyl groups per unit of anhydroglucose can be etherified; Average molecular weight with hydroxyl group of 15
The degree of substitution calculated as 5 is calculated as the average degree of substitution (D
S). In the present invention, the average degree of substitution of the alkali metal salt in the carboxymethylated rice bran is 0.3 or more, and if the degree of substitution is less than 0.3, the water solubility and desizing properties are insufficient as a printing and sizing agent. be.

In addition, when used as a reactive dye, the average degree of substitution is 0.7.
The above is necessary, and if the degree of substitution is less than 0.7, the color paste cannot be used in terms of gelation and desizing properties. In general, reactive dyes dye by chemically bonding with the hydroxyl groups of cellulose fibers through reactive groups such as chlorinated triazine and vinyl sulfonic acid present in their molecules, so they can naturally bond with printing pastes that have hydroxyl groups. There is sex. Such bonding depends on the presence or absence of primary hydroxyl groups that easily react with reactive dyes in the sizing agent, so if the average degree of substitution is set to 0.7 or more in order to extremely substitute the primary hydroxyl groups, the reactive dye It can be used as a sizing agent for textile printing because the bond with is reduced.

When using an alkali metal salt of carboxymethylated rice bran as a printing paste, substances other than polysaccharides and water-insoluble substances must be removed as much as possible because they cause clogging of the screen mesh. Therefore, after carboxymethylation of rice bran, it is necessary to remove insoluble matter using a centrifuge, or to grind the rice bran finer than the usual screen mesh during the final grinding. In addition, since the alkali metal salt of carboxymethylated rice bran generally has a low viscosity, it is also possible to partially crosslink it with ethyrolhydrin or formaldehyde to increase the viscosity and use it as a printing paste for economic reasons. It is valid as

The sizing agent of the present invention is a color paste consisting of a direct dye, an acid dye, a vat dye 1 disperse dye, a 7 toll dye, a rapidogen dye, a vat dye, a metal complex dye, and a pigment 1 reactive dye (DSo, 7 or more). It can be applied as a printing medium 4 during adjustment. In addition, when adjusting color pastes for various textile materials using these dyes, citric acid and tartaric acid are used in combination.

In addition to organic acids such as malic acid and acetic acid used to adjust the pH of color paste, reduction inhibitors such as sodium chlorate and sodium m-nitrobenzenesulfonate, salts such as ammonium sulfate and ammonium tartrate, and urea. , dye solubilizer, antifoaming agent, penetrating agent.

There is no problem in using various auxiliary agents suitable for printing processes such as slow dyeing agents, level dyeing agents, deep dyeing agents, moisture absorbers, and humectants.

Although the printing paste according to the present invention has sufficient basic performance and printing effect even when used alone as a printing medium, it can be used with various pasting pastes such as starch, modified starch, natural gum, and sodium alginate. Furthermore, since it is compatible with carboxymethyl cellulose having various degrees of substitution, it is also possible to use these in combination to form a printing medium.

When applying the size agent of the present invention as a printing medium, the basic requirements are water solubility, heat stability, and viscosity stability over time.
It eliminates all the drawbacks of rice bran in terms of mechanical stirring stability, acid/alkali resistance, chemical resistance, antibacterial properties, reduction resistance, compatibility, etc., and also has a certain surface color development that depends on appropriate fluidity. , expresses excellent level dyeing and sharpness on cloth, and at the same time improves desizing properties. Because of these properties, the sizing agent of the present invention can be used alone as a printing medium, and furthermore, defatted rice bran can be effectively used as rice bran.

Next, the present invention will be explained based on examples.

Example 1 Using a predetermined amount of rice bran and defatted rice bran, and further using a predetermined amount of caustic soda, a predetermined amount of monochloroacetic acid or sodium monochloroacetate, carboxymethylation was performed by a hydrous organic solvent method, and then neutralization, purification, and Dry and crush. At this time, if necessary, after the reaction, an aqueous solution may be prepared in which undissolved components are removed using a centrifuge.

In this way, samples of N(2 salt) of carboxymethylated (CM) rice bran and defatted rice bran having the analytical values shown in Table 1 are obtained.

Table 1 The following base glues are prepared from the above samples and comparative samples. However, since rice bran and defatted rice bran are not water-soluble, the
Boil at 0°C for 2 hours.

Motonoriya 1: Rice bran 25.0% water and water Toriya 2: Defatted rice bran 24.0% 〃 & 3:
CM rice bran A 27.0%〃A4:
// B 34.0% 〃A5:
CM defatted rice bran C26.5% A6: I
f D 33.0% 〃ya 7:
F 40.0% 〃&8: t
l G 42.0% 〃For each base glue,
Check suitability for printing with disperse dyes as follows.

Test fabric: Polyester twill citric acid 0.3% base glue
60.0% water 33.7% total
100.0% Printing process: Flat screen printing - Preparation drying - Reduction - Leaning - Rinse - Drying The test results are shown in Table 2.

After adjusting the color paste viscosity to j 0000 ± 500 cps, the viscosity was measured at 25°C at 2 Orpm and 2 rpm rotation with rotor A5 of a BH type viscometer, and the PV
Calculated by I value = viscosity at 2 Orpm/viscosity at 2 rpm. As this PVI value approaches 1, it approaches Newtonian flow, and as it approaches 0, it approaches plastic flow.゛It means that.

Note 2) Color value (K/S) is the colorimetric color difference, 9
Measured using tZ100IDP model (manufactured by Nippon Denshoku Kogyo Co., Ltd.), and the larger the value, the greater the color value.

Note 3) Level staining, sharpness, desizing properties, and permeability are determined by observation and touch. Evaluation criteria: ◎Best.

○ Good, △ Average, × Bad, × × Unusable The same applies to the following examples.

From Table 2, if rice bran and defatted rice bran are converted into CM with a D S of 0.3 or more, their suitability for printing will be greatly improved.

Also, as is clear from the PVI value, the higher the DS, the P
The VI value also increases and fluidity suitable for mechanical printing is obtained.

Example 2 The following base glue is prepared from the sample obtained in Example 1 and defatted rice bran.

Original paste plate 1: CM converted rice bran B 300% aqueous solution shop 2: CM converted defatted rice bran D 220% 〃A3:
pE 28.0%〃A4:
F 38.0% 〃A5:
H41.0% 〃A6' Defatted rice bran
18.0% 〃The suitability for printing with reactive dye G is confirmed for each base paste as follows.

Sample fabric: Cotton broad urea 10.0% HS powder (manufactured by Kaisei Kagaku Co., Ltd.) 1.0% soda ash
3.0% base glue 60.
0% total 100. , 0% Printing process = Flat Schoon FIJ printing -> Pre-drying - Washing with high pressure steamer - Soaping - Washing - Drying The results of this test are shown in Table 3.

(The following is a margin) Since it is practically unusable, it can be seen from Table 3 that it can be used if ■10.7 or higher.

Also, from the PVI value, a D S of 0.7 or more is suitable for mechanical printing.

Patent applicant Dai-Kogyo Seiyaku Co., Ltd.

Claims (2)

[Claims] (1) A printing paste characterized by containing as an essential component an alkali metal salt of carboxymethylated rice bran having an average degree of substitution calculated as a purity of 0.3 or more. (2) The printing paste according to claim 1, which has an average degree of substitution in terms of purity of 0.7 or more when used as a reactive dye.