阅读说明：本技术 一种防止染料褪色的荧光增白浆液的方法 (Method for preventing dye from fading by using fluorescent whitening slurry ) 是由 周开丰 宁静 赵超越 戴雪珍 于 2021-07-30 设计创作，主要内容包括：本发明涉及纺织助剂领域,具体关于一种防止染料褪色的荧光增白浆液的方法；本发明的一种防止染料褪色的荧光增白浆液的方法,本方法将制备一种涤纶纤维的荧光增白浆液加入到染料印染的纺织品染色过程中去,该种荧光增白浆液可应用于染料印染的纺织品领域中；本发明的荧光增白浆液分散体生物稳定性好,不腐败变质,能防止加染料开释后在贮存过程中染料发生褪色,且分散体制备工艺简单,在研磨时添加分散剂即可,研磨时间短,无需添加任何助剂,具有工艺简单,成本低廉的优点。(The invention relates to the field of textile auxiliary agents, in particular to a method for preventing dye from fading by using fluorescent whitening serous fluid; the method for preparing the fluorescent whitening slurry for preventing the dye from fading is characterized in that the fluorescent whitening slurry for preparing the polyester fiber is added into the dyeing process of the textile printed by the dye, and the fluorescent whitening slurry can be applied to the field of the textile printed by the dye; the fluorescent whitening slurry dispersoid has good biological stability, does not decay or deteriorate, can prevent the dye from fading in the storage process after the dye is added and released, has simple preparation process, can be added with a dispersant during grinding, has short grinding time, does not need to add any auxiliary agent, and has the advantages of simple process and low cost.)

1. A method of preventing dye fading in a fluorescent whitening slurry, comprising the steps of:

the fluorescent whitening agent is ｃA fluorescent whitening slurry which is prepared by adding ｃA bactericidal preservative (CP-A) into ｃA main material and is suitable for polyester fibers, and the slurry also contains ｃA macromolecular antibacterial dispersant, ｃA macromolecular stabilizer and deionized water. According to the mass portion, the fluorescent whitening agent is 15-30 parts, the high molecular antibacterial dispersing agent is 1.5-3 parts, the high molecular stabilizing agent is 3-5 parts, and the balance is deionized water.

2. A method of preventing dye fading in a fluorescent whitening slurry of claim 1, wherein: the fluorescent whitening agent is selected from azole, coumarin, stilbenes, naphthalimide and triazinyl pyrene fluorescent whitening agents.

3. A method of preventing dye fading in a fluorescent whitening slurry of claim 1, wherein: the fluorescent whitening agent is selected from the group consisting of fluorescent whitening agents 135, 179, 185, 199 and isomers thereof, 229, 236, 367, 368, 393, ER-II, ER-I.

4. A method of preventing dye fading in a fluorescent whitening slurry of claim 1, wherein: the fluorescent whitening agent is one of a fluorescent whitening agent ER-II or a fluorescent whitening agent ER-I.

5. Fluorescent whitening agent ER-II according to claim 2, characterized in that: the fluorescent whitening agent is ER-II, 1-o-cyanostyryl-4-p-cyanostyryl benzene.

6. Fluorescent whitening agent ER-I according to claim 2, characterized in that: the fluorescent whitening agent is ER-I, 1, 4-bis (2-cyano styryl) benzene.

7. A method of preventing dye fading in a fluorescent whitening slurry of claim 1, wherein: the macromolecular antibacterial dispersant is prepared by adopting the following method, and comprises the following steps:

dispersing 20-30 parts of acrylamide, 5-8 parts of diallyl diethyl ammonium chloride and 0.3-3 parts of vinyl tributyrinoxime silane in 300 parts of deionized water according to the mass parts, introducing nitrogen, then respectively dropwise adding 1.5-3.4 parts of ammonium persulfate initiator into a four-neck flask filled with a certain amount of deionized water under the stirring condition, controlling the dropwise adding time to be 2-3 h, and keeping the temperature for 3-4 h after the dropwise adding is finished; and finally, cooling to obtain the dispersing agent for the fluorescent whitening agent, and evaporating water to control the solid content of the dispersing agent to be 30-40%.

8. A method of preventing dye fading in a fluorescent whitening slurry of claim 1, wherein: the macromolecular stabilizer is one or two of phthalocyanine blue and phthalocyanine green.

9. A method of preventing dye fading in a fluorescent whitening slurry of claim 1, wherein: the macromolecular stabilizer is polyvinylpyrrolidone.

Technical Field

The invention relates to the field of textile auxiliary agents, in particular to a method for preventing dye from fading by using fluorescent whitening serous fluid.

Background

The fluorescent whitening agent is a color conditioner, has the functions of brightening and brightening, and is widely applied to a plurality of fields of papermaking, spinning, detergents and the like. The fluorescent whitening agent has the action principle that invisible ultraviolet light in light is absorbed, visible blue light is emitted, and after the fluorescent whitening agent is superposed with yellow light emitted by the fabric, the fluorescent whitening agent is complemented to form white light, so that the white light emitted by the fabric is increased, and the naked eye can feel that the white fabric is obviously brightened and whitened, namely the brightening effect. Optical brighteners absorb invisible ultraviolet light, (wavelength range of about 60-380 nm) and convert it to longer wavelength blue or violet visible light, thus compensating for the unwanted yellowish coloration in the substrate, while reflecting more visible light than the original incident wavelength range of 400-600 nm, thus making the article appear whiter, brighter, and more vivid.

CN201910698905.3 discloses a fluorescent whitening agent for acrylic fibers and modified acrylic fibers, which is composed of the following materials in parts by weight: 15-20 parts of compound fluorescent whitening agent, 2-5 parts of epoxy chloropropane, 2-3 parts of fumed silica, 10-15 parts of stearic acid polyethylene glycol ester, 10-15 parts of EDTA, 3-5 parts of caprolactam, 1-3 parts of polyethylene glycol and 30-50 parts of deionized water. The fluorescent whitening agent disclosed by the invention effectively improves the whiteness enhancing capability and the acid resistance of the fluorescent whitening agent to fabrics by compounding the two fluorescent whitening agents, and the fabrics treated by the fluorescent whitening agent have high whiteness, good color fastness and excellent comprehensive performance. .

CN201510946116.9 discloses a dispersant for fluorescent whitening agent, its aqueous dispersion, preparation and application thereof. Respectively dispersing acrylamide and diallyl diethyl ammonium chloride with the polymerization degree of 23 in a proper amount of deionized water, then respectively dropwise adding the acrylamide and an ammonium persulfate initiator into a four-neck flask filled with a certain amount of deionized water under the stirring condition, controlling the temperature to be 79-81 ℃, controlling the dropwise adding time to be 2-3 h, and after the dropwise adding is finished, keeping the temperature for 3-4 h; and finally, cooling to obtain the dispersing agent for the fluorescent whitening agent, wherein the weight average molecular weight of the dispersing agent is 10000-20000. In addition, the invention also provides an aqueous fluorescent brightener dispersion, which contains the fluorescent brightener OB-1, the dispersant for the fluorescent brightener prepared by the method and deionized water. When the aqueous dispersion of the fluorescent whitening agent is applied to whitening fabrics, the whitening and brightening of the fabrics are very uniform, and the whitening effect is obvious.

CN202010459081.7 discloses a dispersant for a polyester fluorescent whitening agent, aiming at solving the problems that the water resistance of polyvinyl alcohol is poor when in use and the unstable condition is easy to occur after long use time, and the key points of the technical scheme are as follows: comprises 20-45% of fatty alcohol-polyoxyethylene ether, 20-31% of polyvinyl acetate, 3-6% of NaOH methanol solution, 10% of PVA-1799 aqueous solution, 5-13% of hydrochloric acid, 30-39% of formaldehyde solution, 5-12.4% of dispersant viscosity improver and the balance of deionized water. The dispersing agent for the polyester fluorescent whitening agent has good stability and strong dispersing ability.

Fungus decolorization degradation dye mechanism the decolorization degradation of dye by fungus generally comprises two processes, wherein the hyphae firstly adsorbs the dye and then biodegrades the adsorbed dye. The dye adsorbed on the hyphae is completely decolorized and degraded at the 4 th day as early as possible, and can be decolorized and degraded for the dye added again, and has the capability of continuously decolorizing and degrading the dye. The fungi can maintain the decolorizing capability on the dye for a long time, and the action process of quick adsorption and continuous decolorization on the dye also has important significance in dye wastewater treatment.

The fluorescent whitening agents used in the above inventions and prior patents have different effects on the fading of dyes. Optical brighteners reduce the light fastness of azo, anthraquinone and triphenylmethane dyes, and pyrazoline optical brighteners accelerate the light embrittlement of blue azo dyes in solution. The use of fluorescent whitening agents in the manufacture or washing of coloured textiles results in a change in shade. Meanwhile, due to the existence of bacteria in the manufacturing or washing process of the colored textile, the dye can be decolorized and degraded.

Disclosure of Invention

The invention provides a method for preparing fluorescent whitening slurry for preventing dye fading, aiming at the problem that fluorescent whitening agents can reduce the light fastness of azo, anthraquinone and triphenylmethane dyes and pyrazoline fluorescent whitening agents can accelerate the light brittleness of blue azo dyes in a solution in textiles printed by using the dyes, so that dyed fabrics and printed fabrics can lose color in washing.

A method of preventing dye fading in a fluorescent whitening slurry, comprising the steps of:

the fluorescent whitening agent is a fluorescent whitening slurry which is prepared by adding the main material and is suitable for polyester fibers, and the slurry also contains a macromolecular antibacterial dispersant, a macromolecular stabilizer and deionized water. The mass parts of the components are as follows: 15-30 parts of fluorescent whitening agent, 1.5-3 parts of macromolecular antibacterial dispersant, 3-5 parts of macromolecular stabilizer and the balance of deionized water.

Further: the fluorescent whitening agent is selected from azole coumarin, stilbenes, naphthalimide triazine pyrene fluorescent whitening agents.

Further: the fluorescent whitening agent is selected from the group consisting of fluorescent whitening agents 135, 179, 185, 199 and isomers thereof, 229, 236, 367, 368, 393, ER-II, ER-I.

Further: the fluorescent whitening agent is one of a fluorescent whitening agent ER-II or a fluorescent whitening agent ER-I;

further: the fluorescent whitening agent ER-II is 1-o-cyanostyryl-4-p-cyanostyryl benzene with CAS number of 13001-38-2; the structural formula is as follows:

further: the fluorescent whitening agent ER-I is 1, 4-bis (2-cyano styryl) benzene, and the CAS number is 3001-39-3; the structural formula is as follows:

further: the preparation method of the macromolecular antibacterial dispersant comprises the following steps:

dispersing 20-30 parts of acrylamide, 5-8 parts of diallyl diethyl ammonium chloride and 0.3-3 parts of vinyl tributyrinoxime silane in 300 parts of deionized water according to the mass parts, introducing nitrogen, then respectively dropwise adding 1.5-3.4 parts of ammonium persulfate initiator into a four-neck flask filled with a certain amount of deionized water under the stirring condition, controlling the dropwise adding time to be 2-3 h, and keeping the temperature for 3-4 h after the dropwise adding is finished; and finally, cooling to obtain the dispersing agent for the fluorescent whitening agent, and evaporating water to control the solid content of the dispersing agent to be 30-40%.

Further: the macromolecular stabilizer is polyvinylpyrrolidone.

The reaction mechanism is as follows:

(1) the action mechanism of the fluorescent whitening slurry for preventing the dye from fading is that the main chain and partial branched chains, such as acylamino, of the prepared dispersant have good hydrophobicity and can be well adsorbed with the fluorescent whitening agent OB-1 through the action modes of hydrogen bond adsorption and the like; the branched chain of the dispersant is water-soluble and has strong steric hindrance in aqueous solution, so that the fluorescent whitening agent particles are well dispersed in the aqueous solution.

(2) The fluorescent whitening agent is a fluorescent whitening slurry which is prepared by adding a macromolecular antibacterial dispersing agent into a main material and is suitable for polyester fibers, and the macromolecular antibacterial dispersing agent is added to prevent bacteria from decoloring and degrading dyes and prevent the color fading of fiber dyes.

The technical effects are as follows:

the method for preparing the fluorescent whitening serous fluid for preventing the dye from fading is to add the prepared fluorescent whitening serous fluid for preventing the dye from fading into a textile printing and dyeing production process. The slurry has good biological stability, no putrefaction and deterioration, and bactericidal effect, and can prevent dye fading during storage after release. The fluorescent brightener water-based dispersion is simple in preparation process, only a dispersing agent is added during grinding, and the grinding time is short; no auxiliary agent is needed, so that the negative influence on the whitening and brightening effect of the fabric applied in the later period is small; the dye composition can also endow the dye with better transfer inhibition effect, thereby playing a role in preventing the fading of fiber dye and the fading dye and improving the stability of dyed fiber.

Drawings

FIG. 1 is a comparison of the slurry prepared in example 2 with a conventional slurry plus dye after 14 days of standing, the slurry prepared in example 2 having a bluish color and the conventional slurry plus dye having a grayish color.

FIG. 2 is a comparison of the appearance of the application swatches made in example 2 and those made with conventional slurry plus dye.

FIG. 3 is a Fourier infrared spectrum of the polymeric antibacterial dispersant prepared in example 3:

an antisymmetric telescopic absorption peak of hydroxyl exists near 3335cm < -1 >, and a variable angle absorption peak of hydroxyl exists near 1629cm < -1 >, so that deionized water participates in the reaction; the expansion absorption peak of the carbonyl group of the amide exists near 1675cm < -1 >, the angle-changing absorption peak of the nitrogen-hydrogen bond exists near 1592cm < -1 >, and the expansion absorption peak of the carbon-hydrogen bond exists near 2960cm < -1 >, so that the acrylamide participates in the reaction; a stretching absorption peak of a carbon-nitrogen single bond exists near 1302cm < -1 >, which indicates that diallyl diethyl ammonium chloride participates in the reaction; an antisymmetric stretching absorption peak of a silicon-oxygen bond exists near 1100/1017cm < -1 >, and the vinyl tributyrinoxime silane participates in the reaction.

Detailed Description

The invention is further illustrated by the following specific examples:

the appearance color of the slurry of the invention is unchanged after the slurry B1 is added with the dye and placed for 14 days, the appearance color of the slurry fades after the common slurry C1 is added with the dye and placed for 14 days, and the two appearance colors are obviously different, as shown in figure 1 in detail. The two slurries with different appearance colors are applied to cloth samples, 1) the appearances of the two slurries are obviously different, which is shown in figure 2, 2) the detection results of a whiteness meter, the whiteness, the color light and the like of the two slurries are changed, and the details are shown in table 1.

A. Dyeing:

0.5g of each of the dyes of examples 1 to 4 and comparative examples D5 to D6 was taken, water was used to prepare fluorescent whitening slurry with a concentration of 0.5g/500mL, 20mL of the fluorescent whitening slurry was mixed with 80mL of the fluorescent whitening slurry, acetic acid/sodium acetate was used to adjust the pH of the dye bath to 5, then the temperature was raised to 60 ℃, 2g of polyester fiber fabric was placed in the dye bath, and the fabric was dyed according to the following high-temperature dyeing procedure: heating from normal temperature to 105 ℃ at 5 ℃/min → heating to 125 ℃ at 1 ℃/min → holding for 45min → cooling to 70 ℃ at 5 ℃/min → natural cooling to 50 ℃ and sampling.

B. Test standards and methods:

the soaping fastness is measured according to the soaping fastness test of GB/T3921-2008 textile color fastness test;

the perspiration fastness is measured according to GB/T3922 and 2013 textile color fastness to perspiration test;

the light fastness is measured according to AATCC 16-2004 light fastness;

the sublimation fastness is determined according to GB/5718 1997 textile colour fastness test sublimation (dry heat) fastness.

C. Application of the swatch (test method):

1. weighing and constant volume

Weighing 1.0000g error +/-0.001 of brightener slurry sample, transferring into a 500ml volumetric flask, fixing the volume to 500ml with deionized water, and shaking up.

2. Sample moving device

100ml of deionized water is taken in a sample dyeing cup, 3ml of brightener solution with 5ml is taken from a volumetric flask with a constant volume by using a 5ml pipette and is put into two sample dyeing cups, and then terylene cloth (2.0 g) is taken to be marked and put into the cup, wherein each cup is provided with one piece of cloth.

3. Dyeing of

And putting the sample dyeing cup into a sample dyeing machine, and dyeing the sample for 30 minutes at the temperature of 100 ℃.

4. Shaping

And after the sample dyeing is finished, taking out the sample dyeing cup, cooling, washing the cloth sample, and drying for 6 minutes at 100 ℃.

5. Testing whiteness

The dried cloth sample was cooled for 20 minutes and then tested on a whiteness meter.

Example 1

A method of preventing dye fading in a fluorescent whitening slurry, comprising the steps of:

the fluorescent whitening slurry is prepared from a main material of a fluorescent whitening agent and is suitable for polyester fibers, and the slurry also contains a macromolecular antibacterial dispersant, a macromolecular stabilizer and deionized water. The composition of the fluorescent whitening agent is 15g, 1.5g of macromolecular antibacterial dispersant, 3g of macromolecular stabilizer and 100 g of deionized water.

The fluorescent whitening agent is a fluorescent whitening agent ER-II;

the fluorescent whitening agent ER-II is 1-o-cyanostyryl-4-p-cyanostyryl benzene with CAS number of 13001-38-2;

the preparation method of the macromolecular antibacterial dispersant comprises the following steps:

dispersing 20g of acrylamide, 5g of diallyl diethyl ammonium chloride and 0.3g of vinyl tributyrinoxime silane in 200g of deionized water, introducing nitrogen, then respectively dropwise adding 1.5g of ammonium persulfate initiator and 1.5g of ammonium persulfate initiator into a four-neck flask filled with a certain amount of deionized water under the condition of stirring, controlling the dropwise adding time to be 2 hours, and preserving heat for 3 hours after the dropwise adding is finished; and finally, cooling to obtain the dispersing agent for the fluorescent whitening agent, and evaporating water to control the solid content of the dispersing agent to be 30%.

The macromolecular stabilizer is polyvinylpyrrolidone.

Example 2

A method of preventing dye fading in a fluorescent whitening slurry, comprising the steps of:

the fluorescent whitening slurry is prepared from a main material of a fluorescent whitening agent and is suitable for polyester fibers, and the slurry also contains a macromolecular antibacterial dispersant, a macromolecular stabilizer and deionized water. The composition of the fluorescent whitening agent is 20g of fluorescent whitening agent, 2g of macromolecular antibacterial dispersant, 4g of macromolecular stabilizer and 100 g of deionized water.

The fluorescent whitening agent is a fluorescent whitening agent ER-II;

the fluorescent whitening agent ER-II is 1-o-cyanostyryl-4-p-cyanostyryl benzene with CAS number of 13001-38-2;

the preparation method of the macromolecular antibacterial dispersant comprises the following steps:

dispersing 25g of acrylamide, 6g of diallyl diethyl ammonium chloride and 1g of vinyl tributyrinoxime silane in 250g of deionized water, introducing nitrogen, then respectively dropwise adding 2.4g of ammonium persulfate initiator into a four-neck flask filled with a certain amount of deionized water under the stirring condition, controlling the dropwise adding time to be 2.5h, and preserving heat for 3h after the dropwise adding is finished; and finally, cooling to obtain the dispersing agent for the fluorescent whitening agent, and evaporating water to control the solid content of the dispersing agent to be 35%.

The macromolecular stabilizer is polyvinylpyrrolidone.

Example 3

A method of preventing dye fading in a fluorescent whitening slurry, comprising the steps of:

the fluorescent whitening slurry is prepared from a main material of a fluorescent whitening agent and is suitable for polyester fibers, and the slurry also contains a macromolecular antibacterial dispersant, a macromolecular stabilizer and deionized water. The composition of the fluorescent whitening agent is 30g of fluorescent whitening agent, 3g of macromolecular antibacterial dispersant, 5g of macromolecular stabilizer and 100 g of deionized water.

The fluorescent whitening agent is a fluorescent whitening agent ER-I;

the fluorescent whitening agent ER-I is a benzimidazole derivative, and the CAS number is 95078-19-6;

the preparation method of the macromolecular antibacterial dispersant comprises the following steps:

respectively dispersing 30g of acrylamide, 8g of diallyl diethyl ammonium chloride and 1g of vinyl tributyrinoxime silane in 300g of deionized water, introducing nitrogen, then respectively dropwise adding 3.4g of ammonium persulfate initiator into a four-neck flask filled with a certain amount of deionized water under the stirring condition, controlling the dropwise adding time to be 3h, and preserving heat for 4h after the dropwise adding is finished; and finally, cooling to obtain the dispersing agent for the fluorescent whitening agent, and evaporating water to control the solid content of the dispersing agent to be 40%.

The macromolecular stabilizer is polyvinylpyrrolidone.

Example 4

A method of preventing dye fading in a fluorescent whitening slurry, comprising the steps of:

the fluorescent whitening slurry is prepared from a main material of a fluorescent whitening agent and is suitable for polyester fibers, and the slurry also contains a macromolecular antibacterial dispersant, a macromolecular stabilizer and deionized water. The composition of the fluorescent whitening agent is 30g of fluorescent whitening agent, 3g of macromolecular antibacterial dispersant, 5g of macromolecular stabilizer and 100 g of deionized water.

The fluorescent whitening agent is a fluorescent whitening agent ER-I;

the fluorescent whitening agent ER-I is a benzimidazole derivative, and the CAS number is 95078-19-6;

the preparation method of the macromolecular antibacterial dispersant comprises the following steps:

dispersing 30g of acrylamide, 8g of diallyl diethyl ammonium chloride and 3g of vinyl tributyrinoxime silane in 300g of deionized water, introducing nitrogen, then respectively dropwise adding 3.4g of ammonium persulfate initiator into a four-neck flask filled with a certain amount of deionized water under the condition of stirring at the temperature of 75 ℃, controlling the dropwise adding time to be 3 hours, and preserving heat for 4 hours after the dropwise adding is finished; and finally, cooling to obtain the dispersing agent for the fluorescent whitening agent, and evaporating water to control the solid content of the dispersing agent to be 40%.

The macromolecular stabilizer is polyvinylpyrrolidone.

Comparative example 5

A method of preventing dye fading in a fluorescent whitening slurry, comprising the steps of:

the fluorescent whitening slurry is prepared from a main material of a fluorescent whitening agent and is suitable for polyester fibers, and the slurry also contains a macromolecular antibacterial dispersant, a macromolecular stabilizer and deionized water. Their mass number: 20g of fluorescent whitening agent, 2g of macromolecular antibacterial dispersant, 4g of macromolecular stabilizer and deionized water to 100 g.

The fluorescent whitening agent is a fluorescent whitening agent ER-II;

the fluorescent whitening agent ER-II is 1-o-cyanostyryl-4-p-cyanostyryl benzene with CAS number of 13001-38-2;

the preparation method of the macromolecular antibacterial dispersant comprises the following steps:

dispersing 25g of acrylamide and 2g of vinyl tributyrinoxime silane in 240g of deionized water, introducing nitrogen, then respectively dropwise adding 2.8g of ammonium persulfate initiator and 2g of acrylamide initiator into a four-neck flask filled with a certain amount of deionized water under the condition of stirring at the temperature of 75 ℃, controlling the dropwise adding time to be 3h, and preserving heat for 3h after the dropwise adding is finished; and finally, cooling to obtain the dispersing agent for the fluorescent whitening agent, and evaporating water to control the solid content of the dispersing agent to be 35%.

The macromolecular stabilizer is polyvinylpyrrolidone.

Comparative example 6

A method of preventing dye fading in a fluorescent whitening slurry, comprising the steps of:

the fluorescent whitening slurry is prepared from a main material of a fluorescent whitening agent and is suitable for polyester fibers, and the slurry also contains a macromolecular antibacterial dispersant, a macromolecular stabilizer and deionized water. The fluorescent whitening agent consists of 25g of fluorescent whitening agent, 2g of dispersing agent, 4g of macromolecular stabilizing agent and 100 g of deionized water.

The fluorescent whitening agent is a fluorescent whitening agent ER-I;

the fluorescent whitening agent ER-I is 1, 4-bis (2-cyano styryl) benzene, and the CAS number is 3001-39-3;

the macromolecular stabilizer is polyvinylpyrrolidone.

The dispersant is polyacrylic acid (molecular weight 2000-.

TABLE 1 fastness and hand feeling of polyester fiber fabric after fixation

It can be seen from table 1 that, after the fluorescent whitening slurry for preventing the fading of the dye is added in the embodiments 1 to 4 of the application, the fixation, the fastness, especially the washing fastness and the sublimation fastness of the fabric are remarkably improved, in addition, the hydrophilicity of the fluorescent whitening slurry is reduced, the migration of the dye is favorably prevented, and the dyed fabric has soft hand feeling, high cost performance and strong environmental protection property.

The appearance color of the slurry is not changed after the slurry B1 in example 2 of the invention is added with the dye and placed for 14 days, the color of the slurry fades after the slurry C1 in comparative example 6 is added with the dye and placed for 14 days, and the two colors are obviously different by visual inspection, which is shown in figure 1 in detail.

The two slurries with different appearance colors are applied to the cloth sample, 1) the obvious difference is observed visually, see figure 2 in detail,

2) the whiteness, color and light of the whiteness-measuring instrument are changed, and the details are shown in table 2.

TABLE 2B 1 and C1 values of whiteness, color tone, etc. of the cloth sample