A dyeing process for high colour fastness cotton fabric

Abstract

The application relates to the technical field of cotton fabric printing and dyeing, in particular to a dyeing process of cotton fabric with high color fastness. The dyeing process of cotton fabric with high color fastness comprises the following steps: dyeing, fixing and washing cotton fabric to obtain cotton fabric with high color fastness; the raw material of the fixing agent used in the fixing step comprises the following components in parts by weight: quaternary ammonium salt compound 15-30 parts, tannic acid 5-15 parts and gelatin 5-10 parts. The cotton fabric prepared by using the dyeing process has the advantages of high dyeing rate and high color fastness.

Description

TECHNICAL FIELD

[0001] The application relates to the cotton fabric printing and dyeing technical field, in particular to a dyeing process of cotton fabric with high color fastness. BACKGROUND

[0002] Natural dyes are derived from natural resources such as plants, insects, animals and microorganisms, and are a kind of renewable and sustainable development dyes. Natural dyes have a wide range of applications in textile dyeing, textile functional finishing and other aspects due to their low or no toxicity, good ecological compatibility and wide sources.

[0003] Most natural dyes have high color fastness on silk, wool and other protein fibers, because protein fibers contain more reactive groups such as amino and carboxyl groups. Amino groups carry positive charges in the dyeing solution, so that the negatively charged natural dyes are easily adsorbed and dyed.

[0004] Cotton fabric is woven from cotton fibers, and has many advantages such as comfortable wearing, good moisture absorption, softness and warmth, easy dyeing, washing resistance, good air permeability and the like. The main component of cotton fiber is cellulose, which accounts for more than 90% of the total weight. The reactive group is usually only hydroxyl group, which is single in type and has weak reactivity, and lacks positive groups, so the affinity with natural dyes is small, resulting in low color fastness of natural dyes on cotton fabric. The cotton fabric dyed with natural dyes is prone to fading during daily wearing and washing, and cannot meet the better wearing performance standard. Therefore, it is urgent to improve the color fastness of natural dyes on cotton fabric. SUMMARY

[0005] In order to solve the problem of low color fastness of natural dyes on cotton fabric, the application provides a dyeing process of cotton fabric with high color fastness.

[0006] In the first aspect, the application provides a dyeing process of cotton fabric with high color fastness, which adopts the following technical scheme:

[0007] A dyeing process of cotton fabric with high color fastness, comprising the following steps:

[0008] The cotton fabric is dyed, fixed and washed to obtain cotton fabric with high color fastness; the raw material of the fixing agent used in the fixing step comprises the following components in parts by weight: quaternary ammonium salt compound 15-30 parts, tannin acid 5-15 parts and gelatin 5-10 parts.

[0009] By adopting the above technical scheme, the fixing agent is used for fixing the color of the cotton fabric, and has the following effects: the tannic acid and the gelatin contain multiple active groups, a part of the active groups are crosslinked with each other, and a protective film with a crosslinked network structure is formed on the surface of the cotton fabric; another part of the active groups are bonded with the active groups on the natural dyes; the quaternary ammonium salt cationic groups on the quaternary ammonium salt compound can form a firm ionic bond with the anionic natural dyes, and a 'bridging' effect is generated between the natural dyes and the cotton fabric, thereby improving the color fastness of the natural dyes on the cotton fabric.

[0010] Preferably, the weight part of the quaternary ammonium salt compound is 25-30 parts.

[0011] Preferably, the weight part of the tannic acid is 10-15 parts.

[0012] Preferably, the quaternary ammonium salt compound is hexadecyl allyl ammonium chloride and / or octadecyl allyl ammonium chloride.

[0013] Preferably, the quaternary ammonium salt compound is a quaternary ammonium salt hyperbranched polymer.

[0014] By adopting the above technical scheme, the quaternary ammonium salt hyperbranched polymer contains more branches, and the branches contain active groups, a part of the active groups can be crosslinked with the active groups on the tannic acid and the gelatin, and another part of the active groups participates in the 'bridging' effect between the cotton fabric and the natural dyes, thereby further improving the color fastness of the natural dyes on the cotton fabric.

[0015] Preferably, the quaternary ammonium salt hyperbranched polymer is prepared by reacting an amino-terminated hyperbranched polymer with an epoxy-terminated quaternary ammonium salt at a mass ratio of (10-18):1.

[0016] Preferably, the mass ratio of the amino-terminated hyperbranched polymer to the epoxy-terminated quaternary ammonium salt is (15-18):1.

[0017] Preferably, the fixing agent further comprises 0.35-0.5 parts of a rare earth metal salt.

[0018] By adopting the above technical scheme, the rare earth metal salt is complexed with the dyes and the cotton fabric respectively to generate a ternary complex of the dyes, the rare earth and the cotton yarn, thereby improving the affinity between the cotton yarn and the dyes; secondly, the tannic acid can be complexed with the rare earth to enhance the stability of the ternary complex and reduce the possibility of precipitation of the rare earth ions, thereby ensuring that the affinity between the cotton yarn and the dyes remains high; thirdly, the rare earth has the property of an electrolyte in the dyeing process, and plays a role in promoting dyeing, thereby improving the dye uptake and the color fastness; fourthly, the rare earth is positively charged and can attract negatively charged dyes; in summary, the rare earth ions, the tannic acid and the quaternary ammonium salt compound cooperate with each other to improve the color fastness of the natural dyes on the cotton fabric.

[0019] Preferably, the rare earth metal salt is one or more of lanthanum chloride, cerium chloride, and neodymium chloride. In summary, the present application has the following advantages:

[0020] 1. The present application uses a fixing agent composed of quaternary ammonium salt compounds, tannic acid and gelatin to fix the color of cotton fabric, which has the following effects: tannic acid and gelatin contain multiple active groups, part of which are cross-linked with each other to form a protective film with cross-linked network structure on the surface of the cotton fabric, and the other part of the active groups are bonded with the active groups on the natural dyes; the quaternary ammonium salt cationic groups on the quaternary ammonium salt compounds can form a firm ionic bond with anionic natural dyes, thereby producing a "bridging" effect between the natural dyes and the cotton fabric, thereby improving the color fastness of the natural dyes on the cotton fabric. DETAILED DESCRIPTION

[0021] Preparation Example of Quaternary Ammonium Salt Hyperbranched Polymer

[0022] The quaternary ammonium salt hyperbranched polymer is prepared according to the following steps:

[0023] S1, take 5 kg of diethylene triamine, cool with ice water bath, add 10 kg of methyl acrylate and 2 kg of methanol dropwise, stir in ice water bath for 1 h, warm up to 18℃, react for 2 h, then warm up to 25℃, react for 2 h, distill under reduced pressure at 65℃ for 1 h, warm up to 100℃, distill under reduced pressure for 1 h, warm up to 125℃, react under reduced pressure for 4 h, cool down to 25℃, to obtain an amino-terminated hyperbranched polymer; S2, take 2 kg of the amino-terminated hyperbranched polymer prepared in S1 and mix with 5 kg of water, stir, warm up to 25℃, add 0.2 kg of epoxy-terminated quaternary ammonium salt 2,3-epoxypropyl trimethyl ammonium chloride dropwise, warm up to 80℃, react for 4 h, vacuum dry at 50℃ for 50 h, to obtain a quaternary ammonium salt hyperbranched polymer.

[0024] Preparation Example B

[0025] The quaternary ammonium salt hyperbranched polymer is prepared according to the following steps:

[0026] S1, take 5 kg of diethylene triamine, cool with ice water bath, add 10 kg of methyl acrylate and 2 kg of methanol dropwise, stir in ice water bath for 1 h, warm up to 18℃, react for 2 h, then warm up to 25℃, react for 2 h, distill under reduced pressure at 65℃ for 1 h, warm up to 100℃, distill under reduced pressure for 1 h, warm up to 125℃, react under reduced pressure for 4 h, cool down to 25℃, to obtain an amino-terminated hyperbranched polymer; S2, take 2 kg of the amino-terminated hyperbranched polymer prepared in S1 and mix with 5 kg of water, stir, warm up to 25℃, add 0.2 kg of epoxy-terminated quaternary ammonium salt 2,3-epoxypropyl trimethyl ammonium chloride dropwise, warm up to 80℃, react for 4 h, vacuum dry at 50℃ for 50 h, to obtain a quaternary ammonium salt hyperbranched polymer.

[0027] Preparation Example C

[0028] The quaternary ammonium salt hyperbranched polymer was prepared according to the following steps:

[0029] S1, 5 kg of diethylene triamine was cooled with ice water bath, 10 kg of methyl acrylate and 2 kg of methanol were added dropwise, stirred in ice water bath for 1 h, warmed to 18 °C, reacted for 2 h, warmed to 25 °C, reacted for 2 h, distilled at 65 °C under reduced pressure for 1 h, warmed to 100 °C, distilled under reduced pressure for 1 h, warmed to 125 °C, reacted under reduced pressure for 4 h, cooled to 25 °C to obtain an amino-terminated hyperbranched polymer; S2, 2.06 kg of the amino-terminated hyperbranched polymer prepared in S1 was mixed with 5 kg of water, stirred, warmed to 25 °C, 0.14 kg of epoxy-terminated quaternary ammonium salt 2,3-epoxypropyl trimethyl ammonium chloride was added dropwise, warmed to 80 °C, reacted for 4 h, vacuum dried at 50 °C for 50 h to obtain the quaternary ammonium salt hyperbranched polymer.

[0030] Example

[0031] Example 1

[0032] A high color fastness cotton fabric was prepared according to the following steps:

[0033] Dyeing: 20 kg of cotton yarn was dyed with natural dye indigo blue pigment, the amount of natural dye was 15% (o.m.f), the bath ratio was 1:20, the dyeing temperature was 25 °C, the temperature rising rate was 1 °C / min, the temperature was raised to 90 °C, the temperature was maintained for 60 min, the cotton yarn was washed three times, and then naturally dried to obtain dyed cotton yarn;

[0034] Fixing and washing treatment: 75 g of quaternary ammonium salt compound hexadecyl allyl ammonium chloride, 25 g of tannic acid, and 25 g of gelatin (model: 9000-70-8) were mixed to obtain a fixing agent, the fixing agent was added to water to obtain a fixing liquid, and the dyed cotton yarn was immersed in the fixing liquid; the fixing agent was 2% of the weight of the dyed cotton yarn, the bath ratio was 1:5, the temperature was 75 °C, and the immersion time was 15 min, after drying, the cotton yarn was washed once at 60 °C and once at 15 °C, and then naturally dried to obtain a high color fastness cotton fabric.

[0035] Example 2

[0036] A high color fastness cotton fabric was prepared according to the following steps:

[0037] Dyeing: 20 kg of cotton yarn was dyed with natural dye indigo blue pigment, the amount of natural dye was 15% (o.m.f), the bath ratio was 1:20, the dyeing temperature was 25 °C, the temperature rising rate was 1 °C / min, the temperature was raised to 90 °C, the temperature was maintained for 60 min, the cotton yarn was washed three times, and then naturally dried to obtain dyed cotton yarn;

[0038] Fixing and washing treatment: take 150 g quaternary ammonium salt compound hexadecyl allyl ammonium chloride, 75 g tannic acid, 50 g gelatin, mix to get fixing agent, add fixing agent into water to get fixing liquid, put dyed cotton yarn into fixing liquid for soaking; fixing agent is 2% of the weight of dyed cotton yarn, bath ratio is 1:5, temperature is 75℃, soaking time is 15 min, after drying, wash once at 60℃, wash once at 15℃, dry naturally, get high color fastness cotton fabric.

[0039] Example 3

[0040] A high color fastness cotton fabric is prepared according to the following steps:

[0041] Dyeing: use natural dye indigo blue pigment to dye 20 kg of cotton yarn, the amount of natural dye is 15% (o.m.f), bath ratio is 1:20, dye at 25℃, temperature rising rate is 1℃ / min, rise temperature to 90℃, keep warm for 60 min, wash 3 times, dry naturally, get dyed cotton yarn;

[0042] Fixing and washing treatment: take 150 g quaternary ammonium salt compound hexadecyl allyl ammonium chloride, 75 g tannic acid, 50 g gelatin, mix to get fixing agent, add fixing agent into water to get fixing liquid, put dyed cotton yarn into fixing liquid for soaking; fixing agent is 2% of the weight of dyed cotton yarn, bath ratio is 1:5, temperature is 75℃, soaking time is 15 min, after drying, wash once at 60℃, wash once at 15℃, dry naturally, get high color fastness cotton fabric.

[0043] Example 4

[0044] A high color fastness cotton fabric is prepared according to the following steps:

[0045] Dyeing: use natural dye indigo blue pigment to dye 20 kg of cotton yarn, the amount of natural dye is 15% (o.m.f), bath ratio is 1:20, dye at 25℃, temperature rising rate is 1℃ / min, rise temperature to 90℃, keep warm for 60 min, wash 3 times, dry naturally, get dyed cotton yarn;

[0046] Fixing and washing treatment: take 150 g quaternary ammonium salt compound hexadecyl allyl ammonium chloride, 75 g tannic acid, 50 g gelatin, mix to get fixing agent, add fixing agent into water to get fixing liquid, put dyed cotton yarn into fixing liquid for soaking; fixing agent is 2% of the weight of dyed cotton yarn, bath ratio is 1:5, temperature is 75℃, soaking time is 15 min, after drying, wash once at 60℃, wash once at 15℃, dry naturally, get high color fastness cotton fabric.

[0047] Example 5

[0048] A high color fastness cotton fabric is prepared according to the following steps:

[0049] Dyeing: 20 kg of cotton yarn was dyed with natural dye Polygonum Blue, the amount of natural dye was 15% (o.m.f), bath ratio was 1:20, dyeing at 25°C, temperature rising rate was 1°C / min, temperature rose to 90°C, kept for 60 min, washed for 3 times, naturally dried, and dyed cotton yarn was obtained;

[0050] Fixing and washing treatment: 75 g of quaternary ammonium salt compound prepared in Preparation Example B, 25 g of tannic acid, and 25 g of gelatin were mixed to obtain a fixing agent, the fixing agent was added to water to obtain a fixing liquid, and dyed cotton yarn was immersed in the fixing liquid; the fixing agent was 2% of the weight of dyed cotton yarn, bath ratio was 1:5, temperature was 75°C, and immersion time was 15 min, after drying, washed once at 60°C and once at 15°C, and naturally dried, and high color fastness cotton fabric was obtained.

[0051] Example 6

[0052] A high color fastness cotton fabric was prepared according to the following steps:

[0053] Dyeing: 20 kg of cotton yarn was dyed with natural dye Polygonum Blue, the amount of natural dye was 15% (o.m.f), bath ratio was 1:20, dyeing at 25°C, temperature rising rate was 1°C / min, temperature rose to 90°C, kept for 60 min, washed for 3 times, naturally dried, and dyed cotton yarn was obtained;

[0054] Fixing and washing treatment: 75 g of quaternary ammonium salt compound prepared in Preparation Example B, 25 g of tannic acid, and 25 g of gelatin were mixed to obtain a fixing agent, the fixing agent was added to water to obtain a fixing liquid, and dyed cotton yarn was immersed in the fixing liquid; the fixing agent was 2% of the weight of dyed cotton yarn, bath ratio was 1:5, temperature was 75°C, and immersion time was 15 min, after drying, washed once at 60°C and once at 15°C, and naturally dried, and high color fastness cotton fabric was obtained.

[0055] Example 7

[0056] A high color fastness cotton fabric was prepared according to the following steps:

[0057] Dyeing: 20 kg of cotton yarn was dyed with natural dye Polygonum Blue, the amount of natural dye was 15% (o.m.f), bath ratio was 1:20, dyeing at 25°C, temperature rising rate was 1°C / min, temperature rose to 90°C, kept for 60 min, washed for 3 times, naturally dried, and dyed cotton yarn was obtained;

[0058] Dyeing and washing treatment: 75 g of quaternary ammonium salt compound cetyl allyl ammonium chloride, 25 g of tannic acid, 25 g of gelatin, 1.75 g of cerium chloride were mixed to obtain a dye fixing agent, the dye fixing agent was added to water to obtain a dye fixing liquid, and the dyed cotton yarn was immersed in the dye fixing liquid; the dye fixing agent was 2% of the weight of the dyed cotton yarn, the bath ratio was 1:5, the temperature was 75°C, the soaking time was 15 min, after drying, 60°C water washing once, 15°C water washing once, and natural air drying to obtain a high color fastness cotton fabric.

[0059] Example 8

[0060] A high color fastness cotton fabric was prepared according to the following steps:

[0061] Dyeing: 20 kg of cotton yarn was dyed with natural dye indigo blue pigment, the amount of natural dye was 15% (o.m.f), the bath ratio was 1:20, the dyeing temperature was 25°C, the temperature was raised at a rate of 1°C / min, the temperature was raised to 90°C, the temperature was maintained for 60 min, the cotton yarn was washed three times, and the cotton yarn was naturally air dried to obtain dyed cotton yarn.

[0062] Dyeing and washing treatment: 75 g of quaternary ammonium salt compound cetyl allyl ammonium chloride, 25 g of tannic acid, 25 g of gelatin, 1.75 g of cerium chloride were mixed to obtain a dye fixing agent, the dye fixing agent was added to water to obtain a dye fixing liquid, and the dyed cotton yarn was immersed in the dye fixing liquid; the dye fixing agent was 2% of the weight of the dyed cotton yarn, the bath ratio was 1:5, the temperature was 75°C, the soaking time was 15 min, after drying, 60°C water washing once, 15°C water washing once, and natural air drying to obtain a high color fastness cotton fabric.

[0063] Comparative Example

[0064] Comparative Example 1

[0065] A high color fastness cotton fabric was prepared according to the following steps:

[0066] Dyeing: 20 kg of cotton yarn was dyed with natural dye indigo blue pigment, the amount of natural dye was 15% (o.m.f), the bath ratio was 1:20, the dyeing temperature was 25°C, the temperature was raised at a rate of 1°C / min, the temperature was raised to 90°C, the temperature was maintained for 60 min, the cotton yarn was washed three times, and the cotton yarn was naturally air dried to obtain dyed cotton yarn.

[0067] Dyeing and washing treatment: 75 g of quaternary ammonium salt compound cetyl allyl ammonium chloride, 25 g of tannic acid, 25 g of gelatin, 1.75 g of cerium chloride were mixed to obtain a dye fixing agent, the dye fixing agent was added to water to obtain a dye fixing liquid, and the dyed cotton yarn was immersed in the dye fixing liquid; the dye fixing agent was 2% of the weight of the dyed cotton yarn, the bath ratio was 1:5, the temperature was 75°C, the soaking time was 15 min, after drying, 60°C water washing once, 15°C water washing once, and natural air drying to obtain a high color fastness cotton fabric.

[0068] Comparative Example 2

[0069] A high color fastness cotton fabric is prepared according to the following steps:

[0070] Dyeing: 20 kg of cotton yarn is dyed with natural dye Polygonum Blue Pigment, the amount of natural dye is 15% (o.m.f), the bath ratio is 1:20, dyeing at 25°C, the temperature is raised at a rate of 1°C / min, the temperature is raised to 90°C, and the temperature is maintained for 60 min, washed three times, and naturally dried to obtain dyed cotton yarn;

[0071] Fixing and washing treatment: 90 g of quaternary ammonium salt compound hexadecyl allyl ammonium chloride and 35 g of tannic acid are mixed to obtain a fixing agent, the fixing agent is added to water to obtain a fixing liquid, the dyed cotton yarn is immersed in the fixing liquid; the fixing agent is 2% of the weight of the dyed cotton yarn, the bath ratio is 1:5, the temperature is 75°C, the immersion time is 15 min, after drying, washed once at 60°C and once at 15°C, and naturally dried to obtain a high color fastness cotton fabric.

[0072] Comparative Example 3

[0073] A high color fastness cotton fabric is prepared according to the following steps:

[0074] Dyeing: 20 kg of cotton yarn is dyed with natural dye Polygonum Blue Pigment, the amount of natural dye is 15% (o.m.f), the bath ratio is 1:20, dyeing at 25°C, the temperature is raised at a rate of 1°C / min, the temperature is raised to 90°C, and the temperature is maintained for 60 min, washed three times, and naturally dried to obtain dyed cotton yarn;

[0075] Fixing and washing treatment: 90 g of quaternary ammonium salt compound hexadecyl allyl ammonium chloride and 35 g of tannic acid are mixed to obtain a fixing agent, the fixing agent is added to water to obtain a fixing liquid, the dyed cotton yarn is immersed in the fixing liquid; the fixing agent is 2% of the weight of the dyed cotton yarn, the bath ratio is 1:5, the temperature is 75°C, the immersion time is 15 min, after drying, washed once at 60°C and once at 15°C, and naturally dried to obtain a high color fastness cotton fabric.

[0076] Performance test

[0077] Detection method

[0078] The high color fastness cotton fabrics prepared in Examples 1-8 and Comparative Examples 1-3 are tested for color depth (K / S value), and the larger the K / S value, the higher the dyeing rate of the dye. The specific method is as follows: fold the cotton yarn twice (four layers), use a Datacolor SF600X computer color matching instrument to measure the K / S value of the dyed fabric at λmax, measure each sample four times and take the average value, and the specific test results are shown in Table 1:

[0079] The high color fastness cotton fabric prepared from Examples 1-8 and Comparative Examples 1-3 was washed for 50 times according to the method described in GB / T 5713-1997, and then the color difference ΔE of the cotton yarn before and after washing was determined according to GB / T 32598-2016 to characterize the color fastness of the cotton yarn. The smaller the ΔE, the higher the color fastness. The specific test results are shown in Table 1 below:

[0080] Table 1. Performance test of high color fastness cotton fabric

[0081] Sample K / S value ΔE after 50 washes Example 2 8.4 1.26 Example 2 8.4 1.12 Example 3 8.7 1.18 Example 4 9.8 0.99 Example 5 10.2 0.96 Example 6 10.4 0.93 Example 7 9.6 1.04 Example 8 9.4 1.08 Comparative Example 1 5.9 2.56 Comparative Example 2 6.2 2.74 Comparative Example 3 6.7 2.64

[0082] As can be seen from Table 1, the high color fastness cotton fabric prepared in the examples has a higher K / S value and a lower ΔE after 50 times of washing, which indicates that the cotton fabric prepared in the examples has a higher dye uptake and higher color fastness.

[0083] Combining Examples 1 and Comparative Examples 1-3 and Table 1, it can be seen that the K / S value of the high color fastness cotton fabric prepared in Example 1 is much higher than that of Comparative Examples 1-3, and the ΔE after 50 times of washing is much lower than that of Comparative Examples 1-3. This may be because: the fixing agent used in Example 1 contains quaternary ammonium salt compounds, tannic acid and gelatin, while Comparative Example 1 does not contain quaternary ammonium salt compounds, Comparative Example 2 does not contain tannic acid, and Comparative Example 3 does not contain gelatin. Tannic acid and gelatin contain multiple active groups. Some of these active groups cross-link with each other to form a protective film with a cross-linked network structure on the surface of the cotton fabric, and the other active groups bond with the active groups on the natural dyes. The quaternary ammonium salt cationic groups on the quaternary ammonium salt compounds can form a firm ionic bond with the anionic natural dyes, and a "bridging" effect is produced between the natural dyes and the cotton fabric, thereby improving the color fastness of the natural dyes on the cotton fabric. The three of them work together to improve the color fastness of the natural dyes on the cotton fabric, and are indispensable to each other.

[0084] The specific embodiments are merely an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A dyeing process for cotton fabrics with high color fastness, characterized in that: The process includes the following steps: dyeing, fixing, and washing cotton fabrics to obtain cotton fabrics with high color fastness; the fixing agent used in the fixing step comprises the following components by weight: 15-30 parts of quaternary ammonium salt compound, 5-15 parts of tannic acid, and 5-10 parts of gelatin; the quaternary ammonium salt compound is a quaternary ammonium salt hyperbranched polymer; the quaternary ammonium salt hyperbranched polymer is prepared by reacting a terminal amino hyperbranched polymer with a terminal epoxy quaternary ammonium salt at a mass ratio of (10-18):1; the fixing agent also includes 0.35-0.5 parts of rare earth metal salt.

2. The dyeing process for high colorfastness cotton fabric according to claim 1, characterized in that: The quaternary ammonium salt compound is present in parts by weight of 25-30 parts.

3. The dyeing process for high colorfastness cotton fabric according to claim 1, characterized in that: The tannic acid is present in parts by weight of 10-15 parts.

4. The dyeing process for high colorfastness cotton fabric according to claim 1, characterized in that: The mass ratio of the terminal amino hyperbranched polymer to the terminal epoxy quaternary ammonium salt is (15-18):

1.

5. The dyeing process for high colorfastness cotton fabric according to claim 1, characterized in that: The rare earth metal salt is one or more of lanthanum chloride, cerium chloride, and neodymium chloride.