A color fastness improver for nylon printing, its preparation method and application

Abstract

The invention discloses a color fastness enhancer for nylon printing, and a preparation method and application thereof. A color fastness enhancer for nylon printing, the raw materials for preparing the color fastness enhancer include by mass: 30-48 parts of bisphenol S, 15-25 parts of organic solvent, 8-15 parts of sulfonating agent, 3-8 parts of sodium p-hydroxybenzene sulfonate, 5-10 parts of condensing agent, 0.5-3 parts of inhibitor for preventing color fastness, 1-3 parts of color light retaining agent and 10-35 parts of deionized water. A color fastness enhancer for nylon printing provided by the present invention can significantly improve color fastness, and the color light changes little, and can maintain bright fluorescent color; it can also effectively improve the color fastness to washing and blister fastness of fabrics; it has nylon white bottom anti-staining performance, the working fluid is stable, and the formation of fabric color fastness can be effectively avoided; the preparation method is simple, safe, and efficient, the condition requirements are low, and high temperature and high pressure are not required, which is suitable for industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of printing and dyeing auxiliaries, and in particular to a color fastness improving agent for nylon printing, and a preparation method and application thereof. Background Art

[0002] Nylon fabrics are generally dyed or printed with acid dyes. Due to the presence of water-soluble groups such as carboxyl or sulfonic acid groups in the molecular structure of acid dyes, the wet fastness of nylon fabrics is poor. Therefore, in order to improve the quality of nylon fabrics, they need to be fixed after printing to achieve better color fastness.

[0003] After printing, nylon fabrics must be washed with anti-stain soap before the next color fixing process. After soap washing, there will inevitably be a small amount of soaping agent residue on the fabric. Therefore, in the subsequent color fixing process, the compatibility of soaping agent and acidic color fixing agent must be considered. At present, the color fastness improvers for nylon on the market are generally aromatic sulfonic acid polycondensates. When used for color fixing of nylon printed fabrics, they are often prone to color fixation spots, staining of the printed white background, and large changes in color after color fixing. Therefore, it is of great practical significance to improve the performance of color fastness improvers to solve the above-mentioned problems. Summary of the invention

[0004] The purpose of the present invention is to provide a color fastness improving agent for nylon printing, a preparation method and application thereof, so as to solve the problems that when nylon printed fabric is fixed, color fastening spots are often easily generated, the white background of the print is easily stained, and the color light changes greatly after fixing.

[0005] To achieve the above object, the present invention provides a color fastness improving agent for nylon printing, and a preparation method and application thereof. A color fastness improving agent for nylon printing, the preparation raw materials include, by weight: 30-48 parts of bisphenol S, 15-25 parts of organic solvent, 8-15 parts of sulfonating agent, 3-8 parts of sodium p-hydroxybenzenesulfonate, 5-10 parts of condensing agent, 0.5-3 parts of color spot prevention inhibitor, 1-3 parts of color light retaining agent and 10-35 parts of deionized water.

[0006] Preferably, the raw materials for preparation include, by mass, 30 parts of bisphenol S, 15 parts of organic solvent, 8 parts of sulfonating agent, 3 parts of sodium p-hydroxybenzenesulfonate, 5 parts of condensing agent, 0.5 parts of color spot prevention inhibitor, 1 part of color light retaining agent and 10 parts of deionized water.

[0007] Preferably, the raw materials for preparation include, by mass, 48 parts of bisphenol S, 25 parts of organic solvent, 15 parts of sulfonating agent, 8 parts of sodium p-hydroxybenzenesulfonate, 10 parts of condensing agent, 3 parts of color spot prevention inhibitor, 3 parts of color light retaining agent and 35 parts of deionized water.

[0008] Preferably, the preparation raw materials include, by mass: 40 parts of bisphenol S, 20 parts of organic solvent, 10 parts of sulfonating agent, 5 parts of sodium p-hydroxybenzenesulfonate, 8 parts of condensing agent, 2 parts of solid color spot prevention inhibitor, 2 parts of color light retention agent, and 30 parts of deionized water.

[0009] Preferably, the organic solvent is acetic anhydride; the sulfonating agent is concentrated sulfuric acid.

[0010] Preferably, the color light retention agent is one or a mixture of two of sodium sulfite and sodium bisulfite; the condensing agent is liquid formaldehyde.

[0011] Preferably, the structural formula of the solid color spot prevention inhibitor is

[0012] A preparation method of a color fastness improver for nylon printing as described above comprises the following steps:

[0013] S1. Add bisphenol S and organic solvent into a four-necked flask, start stirring, heat up to 98 - 110 °C and keep the temperature for reaction for 30 - 60 min to obtain a first solution;

[0014] S2. Cool the first solution to 95 - 98 °C, add the sulfonating agent, and keep the temperature for reaction for 4 - 6 h at 98 - 105 °C to obtain a second solution;

[0015] S3. Cool the second solution to 80 - 85 °C, add sodium p-hydroxybenzenesulfonate, stir for 10 - 20 min, slowly dropwise add the condensing agent, control the dropping temperature between 85 - 95 °C, and when the temperature exceeds the limit, timely cool it down with circulating cooling water. After the condensing agent is added dropwise, keep the temperature for reaction for 3 - 4 h at 100 - 105 °C to obtain a third solution;

[0016] S4. Cool the third solution to 80 - 85 °C, add the solid color spot prevention inhibitor and deionized water, stir for 10 - 20 min to obtain a fourth solution;

[0017] S5. Add the color light retention agent and deionized water to the fourth solution, continue stirring for 10 - 30 min, add deionized water, stir evenly, filter and discharge to obtain the color fastness improver for nylon printing.

[0018] An application of a color fastness improver for nylon printing as described above in fabric printing and dyeing.

[0019] A using method of a color fastness improver for nylon printing as described above, which uses the impregnation method to fix the color of nylon printed fabrics; the mass fraction of the color fastness improver is 1 - 5% (o.w.f), the bath ratio is 1:(10 - 20), the pH value of the working solution is 4 - 4.5, keep the temperature at 55 - 65 °C, and impregnate for 20 - 30 min.

[0020] Therefore, a color fastness improver for nylon printing, its preparation method and application provided by the present invention have the following technical effects:

[0021] 1. The color fastness improver for nylon printing provided by the present invention has a stable working solution, especially has good compatibility with a small amount of nylon anti-staining soap washing agent remaining after the soaping process of nylon printed fabrics; it can avoid the formation of fixed color spots on the fabric surface during the fabric treatment process;

[0022] 2. After being treated with the color fastness improver for nylon printing provided by the present invention, the fabric has good color fastness, can avoid color staining on the white background, and has a small color change. Especially in the fixation of fluorescent acid dyes, it can maintain a bright fluorescent color and has a small color change; the wash fastness of the fabric is improved;

[0023] 3. The preparation method of the color fastness improver for nylon printing provided by the present invention is simple, safe, efficient, has low condition requirements, does not require high temperature and high pressure, and is suitable for industrial production.

[0024] The following are detailed descriptions of the technical solutions of the present invention through examples. Specific Embodiments

[0025] The following further illustrates the technical solutions of the present invention through examples.

[0026] In order to make the purpose, technical solutions and advantages of the present application clearer, more thorough and complete, the technical solutions in the embodiments of the present invention are clearly and completely described below through examples. The following detailed descriptions are all descriptions of examples, aiming to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs.

[0027] The instruments and reagents used in the examples were all obtained through commercial channels.

[0028] Example 1

[0029] Prepare a color fastness improver for nylon printing, and the steps are as follows:

[0030] S1. Accurately weigh 40 g of bisphenol S, 20 g of acetic anhydride, 10 g of concentrated sulfuric acid, 5 g of sodium p-hydroxybenzenesulfonate, 8 g of liquid formaldehyde, 2 g of fixed color spot prevention inhibitor, 2 g of sodium sulfite, and 30 g of deionized water.

[0031] The structural formula of the fixed color spot prevention inhibitor is

[0032] S2. Add bisphenol S and acetic anhydride into a four-necked flask, start stirring, heat up to 98 - 110 °C and keep the temperature for 45 min to obtain the first solution; cool the first solution to 95 - 98 °C, add concentrated sulfuric acid, and keep the temperature at 98 - 105 °C for 5 h to obtain the second solution.

[0033] S3. Cool the second solution to 80 - 85 °C, add sodium p - hydroxybenzenesulfonate, stir for 15 min, slowly add liquid formaldehyde while controlling the dropping temperature between 85 - 95 °C. When the temperature exceeds the range, cool it down in time with circulating cooling water. After adding all the liquid formaldehyde, keep the temperature at 100 - 105 °C for 3.5 h to obtain the third solution.

[0034] S4. Cool the third solution to 80 - 85 °C, add a solid color stain inhibitor and 15 g of deionized water, stir for 15 min to obtain the fourth solution. Add sodium sulfite and 15 g of deionized water to the fourth solution, continue to stir for 20 min, then add the remaining deionized water, stir evenly, filter and discharge to obtain the color fastness improver for nylon printing.

[0035] Example Two

[0036] Prepare a color fastness improver for nylon printing. The steps are exactly the same as those in Example One, except that:

[0037] In step S1, the components are 35 g of bisphenol S, 15 g of acetic anhydride, 8 g of concentrated sulfuric acid, 4 g of sodium p - hydroxybenzenesulfonate, 9 g of liquid formaldehyde, 0 g of solid color stain inhibitor, 3 g of sodium sulfite and 30 g of deionized water respectively;

[0038] In step S2, keep the temperature at 98 - 105 °C for 6 h;

[0039] In step S3, keep the temperature at 100 - 105 °C for 3 h.

[0040] Example Three

[0041] Prepare a color fastness improver for nylon printing. The steps are exactly the same as those in Example One, except that:

[0042] In step S1, the components are 35 g of bisphenol S, 15 g of acetic anhydride, 8 g of concentrated sulfuric acid, 4 g of sodium p - hydroxybenzenesulfonate, 9 g of liquid formaldehyde, 2 g of solid color stain inhibitor, 0 g of sodium sulfite and 30 g of deionized water respectively;

[0043] In step S4, add a solid color stain inhibitor and 30 g of deionized water, stir for 15 min, and then discharge after obtaining the fourth solution to obtain the color fastness improver for nylon printing.

[0044] Example Four

[0045] Prepare a color fastness improver for nylon printing. The steps are exactly the same as those in Example 1, except that:

[0046] In step S1, the components are 30 g of bisphenol S, 15 g of acetic anhydride, 8 g of concentrated sulfuric acid, 3 g of sodium p-hydroxybenzenesulfonate, 5 g of liquid formaldehyde, 0.5 g of solid color spot prevention inhibitor, 1 g of sodium bisulfite, and 10 g of deionized water respectively;

[0047] In step S2, heat up to 98 - 110 °C and keep the reaction for 30 min; after adding concentrated sulfuric acid, keep the reaction at 98 - 105 °C for 4 h;

[0048] In step S3, add sodium p-hydroxybenzenesulfonate and stir for 10 min; after dropping in liquid formaldehyde, keep the reaction at 100 - 105 °C for 3 h;

[0049] In step S4, add the solid color spot prevention inhibitor and 5 g of deionized water, and stir for 10 min; add sodium sulfite and 5 g of deionized water to the fourth solution, and continue to stir for 10 min.

[0050] Example 5

[0051] Prepare a color fastness improver for nylon printing. The steps are exactly the same as those in Example 1, except that:

[0052] In step S1, the components are 48 g of bisphenol S, 25 g of acetic anhydride, 15 g of concentrated sulfuric acid, 8 g of sodium p-hydroxybenzenesulfonate, 10 g of liquid formaldehyde, 3 g of solid color spot prevention inhibitor, 1 g of sodium sulfite, 2 g of sodium bisulfite, and 35 g of deionized water respectively;

[0053] In step S2, heat up to 98 - 110 °C and keep the reaction for 60 min; after adding concentrated sulfuric acid, keep the reaction at 98 - 105 °C for 6 h;

[0054] In step S3, add sodium p-hydroxybenzenesulfonate and stir for 20 min; after dropping in liquid formaldehyde, keep the reaction at 100 - 105 °C for 4 h;

[0055] In step S4, add the solid color spot prevention inhibitor and 15 g of deionized water, and stir for 20 min; add sodium sulfite and 20 g of deionized water to the fourth solution, and continue to stir for 30 min.

[0056] Effect Example 1

[0057] The color fastness improvers for nylon printing prepared in Examples 1 to 5 and the commercially available color fixatives were used to fix the color of nylon printed fabrics by the impregnation method. Impregnation method: 5% (o.w.f) of the color fastness improver, liquor ratio 1:15, working solution pH = 4.5, keep the temperature at 55 - 65 °C, impregnate for 30 min. Then wash with water, dry, and test. The test results of color fastness, color change and whiteness are shown in Table 1.

[0058] Table 1

[0059]

[0060] Note: (1) For the test of △E, take the same pattern and the same color of nylon printing for testing.

[0061] (2) Color fastness to washing: Determined according to the method of GB / T 3921-2008 "Textiles - Tests for color fastness - Color fastness to washing". The rating is carried out with the staining grey scale of GB / T 251-2008.

[0062] Effect Example 2

[0063] The stability of the working solution was observed by the padding method to judge whether there were color fixing spots on the fabric surface and the stability of the working solution. The specific method is as follows: Gradually pour 1000 ml of the working solutions of the color fastness improvers prepared in Examples 1 to 5 at 20 g / L and the commercially available color fixative working solution into the padding trough, and continuously pad 60 pieces of 20 cm × 25 cm nylon warp knitted printed fabrics that have been soaped, and observe the situation of the padding trough and the fabric surface. The results are shown in Table 2.

[0064] Table 2

[0065]

[0066] Result Analysis

[0067] As can be seen from Table 1, the color fastness improver for nylon provided by the present invention can significantly improve the color fastness to washing of nylon fabrics, and the color change of the fabric before and after color fixing is small, and it has good anti-staining performance for nylon white background.

[0068] As can be seen from Table 2, the color fastness improver for nylon provided by the present invention has a stable working solution and no color fixing spots appear during use. The color fastness improver for nylon of the present invention belongs to a high molecular weight aromatic sulfonic acid condensate and is a strong anionic type. It can form an umbrella-shaped coverage on the fiber surface, block the voids, and hinder the diffusion of water-soluble dyes, thereby improving the color fastness. At the same time, the color fixing spot prevention inhibitor can make the working solution stable, thus ensuring that the fabric surface is clean without color fixing spots. The addition of the color shade maintaining agent can make the color change of the fabric extremely small before and after color fixing, meeting the requirements.

[0069] Therefore, a color fastness improver for nylon printing provided by the present invention can significantly improve color fastness, with small color change and can maintain bright fluorescent colors; it can also effectively improve the wash color fastness and water immersion fastness of fabrics; it has the property of preventing white nylon from staining, the working solution is stable, and it has good compatibility, which can effectively avoid the formation of solid color spots on fabrics; the preparation method is simple, safe, efficient, with low requirements, without high temperature and high pressure, and is suitable for industrial production.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A color fastness improver for nylon printing, characterized in that, The raw materials for preparing the color fastness enhancer for nylon printing include, by weight: 30-48 parts of bisphenol S, 15-25 parts of organic solvent, 8-15 parts of sulfonating agent, 3-8 parts of sodium p-hydroxybenzenesulfonate, 5-10 parts of condensing agent, 0.5-3 parts of color spot prevention inhibitor, 1-3 parts of color light retaining agent and 10-35 parts of deionized water; The structural formula of the solid color stain prevention inhibitor is The organic solvent is acetic anhydride; the sulfonating agent is concentrated sulfuric acid; The preparation method of the color fastness improving agent for nylon printing comprises the following steps: S1. Add bisphenol S and an organic solvent into a four-necked flask, start stirring, raise the temperature to 98-110° C. and keep the temperature to react for 30-60 minutes to obtain a first solution; S2, cooling the first solution to 95-98°C, adding a sulfonating agent, and reacting at 98-105°C for 4-6 hours to obtain a second solution; S3, cooling the second solution to 80-85°C, adding sodium p-hydroxybenzenesulfonate, stirring for 10-20min, slowly dropping the condensing agent, controlling the dropping temperature between 85-95°C, and cooling with circulating cooling water in time when the temperature is over-temperature. After the condensing agent is added, heat-retaining reaction is carried out at 100-105°C for 3-4h to obtain a third solution; S4, cooling the third solution to 80-85° C., adding a stain fixation inhibitor and deionized water, and stirring for 10-20 minutes to obtain a fourth solution; S5. Add a color retainer and deionized water to the fourth solution, continue stirring for 10-30 minutes, add deionized water, stir evenly, filter the material, and obtain a color fastness enhancer for nylon printing.

2. The color fastness improver for nylon printing according to claim 1, characterized in that, The raw materials for preparation include, by mass, 30 parts of bisphenol S, 15 parts of organic solvent, 8 parts of sulfonating agent, 3 parts of sodium p-hydroxybenzenesulfonate, 5 parts of condensing agent, 0.5 parts of color spot prevention inhibitor, 1 part of color light retaining agent and 10 parts of deionized water.

3. A color fastness improver for nylon printing according to claim 1, characterized in that, The raw materials for preparation include, by mass, 48 parts of bisphenol S, 25 parts of organic solvent, 15 parts of sulfonating agent, 8 parts of sodium p-hydroxybenzenesulfonate, 10 parts of condensing agent, 3 parts of color spot prevention inhibitor, 3 parts of color light retaining agent and 35 parts of deionized water.

4. A color fastness improver for nylon printing according to claim 1, characterized in that, The raw materials for preparation include, by mass, 40 parts of bisphenol S, 20 parts of organic solvent, 10 parts of sulfonating agent, 5 parts of sodium p-hydroxybenzenesulfonate, 8 parts of condensing agent, 2 parts of color spot prevention inhibitor, 2 parts of color light retaining agent and 30 parts of deionized water.

5. A color fastness improver for nylon printing, characterized in that: The color retaining agent is one of sodium sulfite and sodium bisulfite or a mixture of the two; the condensing agent is liquid formaldehyde.

6. Use of the color fastness improving agent for nylon printing as claimed in any one of claims 1 to 5 in fabric printing and dyeing.

7. A method for using a color fastness improver for nylon printing according to any one of claims 1-5, characterized in that: The nylon printed fabric is fixed by an immersion method; the mass fraction of the color fastness enhancer is 1-5% (owf), the bath ratio is 1:(10-20), the working solution pH is 4-4.5, the temperature is maintained at 55-65°C, and the immersion is carried out for 20-30 minutes.

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