An active printing paste for rayon and its preparation method and application

Abstract

The present invention discloses a reactive printing paste for rayon and its preparation method and application. The reactive printing paste provided by the present invention, by weight, comprises the following components: 50 - 70 parts of a base material, 5 - 10 parts of a humectant, 1 - 3 parts of a shielding agent A, 10 - 30 parts of a rheological agent, 5 - 8 parts of a shielding agent B; 2 - 3 parts of an antifoaming agent; the base material is fenugreek gum or carboxymethyl-modified fenugreek gum; the humectant is lubrajel; the shielding agent A is fatty alcohol polyoxyethylene ether; the rheological agent is sodium carboxymethyl cellulose; the shielding agent B is phosphate. The paste has a high de-sizing rate, soft handfeel, high color yield, and high contour clarity. Its preparation method is simple and the cost is low, and it can completely replace sodium alginate paste.

Description

Technical Field

[0001] The present invention belongs to the technical field of textile chemistry and dyeing and finishing engineering, and particularly relates to an active printing paste for rayon and a preparation method and application thereof. Background Art

[0002] Rayon is often used to make close-fitting clothes, so higher requirements are placed on its hand feeling. Especially compared with cotton, it feels softer. For printed fabrics, the selection of the printing paste is crucial if the hand feeling is to reach the level of dyed fabrics.

[0003] Sodium alginate, as an ideal paste base for active printing of rayon, also shows prominent disadvantages with the increasing demands of people. Due to its applications in food and medical fields, its price has been rising continuously. At the same time, unstable factors such as red tides at sea have made its price extremely unstable in the past two years. Therefore, the development of sodium alginate substitutes is extremely urgent.

[0004] Currently, the solutions to the above problems mainly focus on the modification of sodium alginate and the development of printing pastes such as modified carboxymethyl cellulose sodium and modified starch. However, the research results have not yet achieved satisfactory printing effects and color fastness, especially in terms of the hand feeling of rayon fabrics, which has always been a key point seeking breakthroughs. Summary of the Invention

[0005] The purpose of the present invention is to provide an active printing paste for rayon and a preparation method and application thereof. The present invention uses fenugreek gum as the paste base, and synergistically combines components such as carboxymethyl cellulose sodium and lubrajel. The obtained active printing paste for rayon has a high de-pasting rate, a soft hand feeling, little influence on the finishing effects of post-finishing (such as waterproofing and softening), good film-forming hygroscopicity, high color yield, and high contour clarity. Its preparation method has the advantages of simple process and low cost, and can completely replace sodium alginate paste.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides an active printing paste, which comprises the following components in parts by weight: 50 - 70 parts of a base material, 5 - 10 parts of a humectant, 1 - 3 parts of a shielding agent A, 10 - 30 parts of a rheological agent, 5 - 8 parts of a shielding agent B; 2 - 3 parts of an antifoaming agent;

[0008] The base material is fenugreek gum or carboxymethyl-modified fenugreek gum;

[0009] The humectant is lubrajel;

[0010] The shielding agent A is fatty alcohol polyoxyethylene ether;

[0011] The rheological agent is carboxymethyl cellulose sodium;

[0012] The masking agent B is a phosphate.

[0013] The viscosity of the base material is 10,000 - 100,000 mPa·s.

[0014] The viscosity of the lubrajel is CG or MS.

[0015] The degree of polymerization of the fatty alcohol polyoxyethylene ether is 10 - 100.

[0016] The degree of substitution of the sodium carboxymethyl cellulose is 1.5 - 2.0, and the viscosity is 50 - 100 mPa·s.

[0017] The phosphate is sodium hexametaphosphate and / or sodium tripolyphosphate.

[0018] The defoamer is a mineral oil defoamer or a silicone defoamer.

[0019] The reactive printing paste is any one of the following (1) - (4):

[0020] (1) 62 parts of fenugreek gum, 5 parts of lubrajel, 3 parts of fatty alcohol polyoxyethylene ether, 20 parts of sodium carboxymethyl cellulose, 8 parts of phosphate, 2 parts of defoamer;

[0021] (2) 70 parts of fenugreek gum, 6 parts of lubrajel, 3 parts of fatty alcohol polyoxyethylene ether, 12 parts of sodium carboxymethyl cellulose, 6 parts of phosphate, 3 parts of defoamer;

[0022] (3) 50 parts of fenugreek gum, 10 parts of lubrajel, 3 parts of fatty alcohol polyoxyethylene ether, 30 parts of sodium carboxymethyl cellulose, 5 parts of phosphate, 2 parts of defoamer;

[0023] (4) 55 parts of fenugreek gum, 5 parts of lubrajel, 3 parts of fatty alcohol polyoxyethylene ether, 27 parts of sodium carboxymethyl cellulose, 7 parts of phosphate, 3 parts of defoamer.

[0024] Second, the present invention provides a method for preparing the reactive printing paste, including the following steps:

[0025] (1) Add the base material to a reaction kettle and stir, then add the masking agent A and stir;

[0026] (2) Add the humectant and the rheological agent to the reaction kettle and continue to stir;

[0027] (3) Add the defoamer to the reaction kettle and continue to stir;

[0028] (4) Add the masking agent B to the reaction kettle and stir to obtain the reactive printing paste.

[0029] Third, the present invention provides the application of the reactive printing paste in the reactive printing of rayon.

[0030] The beneficial effects achieved by the present invention are as follows:

[0031] 1. The reactive printing paste for rayon provided by the present invention creatively uses fenugreek gum containing a large amount of hydroxyl groups as the main body, supplemented by sodium carboxymethyl cellulose for synergy, improving the rheology of the paste and achieving better printing uniformity, solving the problem of poor rheology of fenugreek gum; adding lubrajel gum enhances the water-locking and moisturizing properties of the paste, making the printed patterns clearer and solving the problem of poor stripping and pasting properties of fenugreek gum; and further adding phosphate and fatty alcohol polyoxyethylene ether as masking agents to increase the color yield and vividness of the paste.

[0032] 2. The reactive printing paste provided by the present invention is not only easy to prepare, but also far lower in cost than sodium alginate, easy to be used and popularized industrially, and is safe and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is the comparison result of the stripping rate of the reactive pastes with different ratios and the commercially available algal pastes in Examples 1-4 of the present invention.

[0034] Figure 2 It is the comparison result of the color yield of the reactive pastes with different ratios and the commercially available algal pastes in Examples 1-4 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0035] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited to the following embodiments.

[0036] The experimental methods used in the following embodiments are all conventional methods unless otherwise specified.

[0037] The reagents, biological materials, etc. used in the following embodiments can all be obtained from commercial channels unless otherwise specified.

[0038] The defoamer used in the following examples is BASF defoamer 2410.

[0039] The algal paste used in the following comparative examples is commercially available conventional sodium alginate.

[0040] Example 1. Preparation of the reactive printing paste for rayon

[0041] The steps are as follows:

[0042] (1) Add 62 parts of fenugreek gum to the reaction kettle and stir, then add 3 parts of fatty alcohol polyoxyethylene ether and continue stirring for 12 min;

[0043] (2) Add 5 parts of lubrajel gum and 18 parts of sodium carboxymethyl cellulose to the reaction kettle and continue stirring for 12 min;

[0044] (3) Slowly add 2 parts of defoamer to the reaction kettle and continue stirring for 12 min;

[0045] (4) Slowly add 8 parts of phosphate to the reaction kettle and stir for 12 min to obtain the reactive printing paste.

[0046] Example 2. Preparation of reactive printing paste for rayon

[0047] The steps are as follows:

[0048] (1) Add 70 parts of fenugreek gum to the reaction kettle and stir, then add 3 parts of fatty alcohol polyoxyethylene ether and continue stirring for 12 min;

[0049] (2) Add 6 parts of lubrajel and 12 parts of sodium carboxymethyl cellulose to the reaction kettle and continue stirring for 12 min;

[0050] (3) Slowly add 3 parts of defoamer to the reaction kettle and continue stirring for 12 min;

[0051] (4) Slowly add 6 parts of phosphate to the reaction kettle and stir for 12 min to obtain the reactive printing paste.

[0052] Example 3. Preparation of reactive printing paste for rayon

[0053] The steps are as follows:

[0054] (1) Add 50 parts of fenugreek gum to the reaction kettle and stir, then add 3 parts of fatty alcohol polyoxyethylene ether and continue stirring for 12 min;

[0055] (2) Add 10 parts of lubrajel and 30 parts of sodium carboxymethyl cellulose to the reaction kettle and continue stirring for 12 min;

[0056] (3) Slowly add 2 parts of defoamer to the reaction kettle and continue stirring for 12 min;

[0057] (4) Slowly add 5 parts of phosphate to the reaction kettle and stir for 12 min to obtain the reactive printing paste.

[0058] Example 4. Preparation of reactive printing paste for rayon

[0059] The steps are as follows:

[0060] (1) Add 55 parts of fenugreek gum to the reaction kettle and stir, then add 3 parts of fatty alcohol polyoxyethylene ether and continue stirring for 12 min;

[0061] (2) Add 5 parts of lubrajel and 27 parts of sodium carboxymethyl cellulose to the reaction kettle and continue stirring for 12 min;

[0062] (3) Slowly add 3 parts of defoamer to the reaction kettle and continue stirring for 12 min;

[0063] (4) Slowly add 7 parts of phosphate into the reaction kettle and stir for 12 min to obtain the reactive printing paste.

[0064] Table 1 Formulation of reactive printing paste for rayon

[0065]

[0066] Performance Test

[0067] Printing experiment

[0068] 1. Fabric: The textile used is a rayon fabric that has been desized, scoured, and bleached (yarn count 30×30, density 68×68)

[0069] 2. Paste preparation:

[0070] Example: Weigh the required amount of the paste obtained in Examples 1-4, add it to the corresponding water while stirring, stir at a speed of 2000 r / min for 40 min, let it stand for 2 h, and set aside for use.

[0071] Control example: Weigh the required amount of algal paste (sodium alginate), add it to the corresponding water while stirring, stir at a speed of 2000 r / min for 40 min, let it stand for 2 h, and set aside for use.

[0072] 3. Printing formulation

[0073] Table 2 Printing formulation

[0074]

[0075]

[0076] Note: The amount of paste affects the viscosity of the color paste, and the x and y values are adjusted specifically according to the required viscosity.

[0077] 4. Printing process

[0078] Paste preparation → Prepare a color paste with a viscosity of 8000 mPa·s → Flat screen printing (screen 120 mesh, magnetic bar pressure 35, vehicle speed 25) → Drying ((100 - 105) °C × 4 min) → Steam heating (103 °C × 8 min) → Cold water washing → Soaping (4 min, anti-staining soaping agent FK-9500 × 2 g / l) → Drying (80 °C) → Standing for 10 min → Testing.

[0079] 5. Index testing

[0080] 5.1 Desizing rate testing

[0081] The desizing rate is one of the important indicators to characterize the handle of printed fabrics. The desizing rate is not only related to the printing process, but more importantly, it depends on the properties of the paste itself. A high desizing rate results in a soft handle of the printed fabric.

[0082] The formula for calculating the desizing rate is as follows:

[0083] Desizing rate % = (m2 - m3) / (m2 - m1) * 100%

[0084] Where: m1, m2, and m3 represent the dry weights of the fabric before printing, after printing, and after soaping, respectively, in g.

[0085] The results are as Figure 1 shown. The desizing rates of the pastes obtained in Examples 1-4 on rayon all reached over 93%, with a maximum of 95%, which is higher than 87% of the comparative example. Therefore, the handle of the fabric samples is softer, and it has little impact on the finishing effects of post-finishing (such as waterproofing and softening).

[0086] 5.2 Apparent color yield test

[0087] Use a colorimeter to measure the color depth (K / S 65 ) of the front side of the printed fabric under the conditions of D 正 light source and a 10° standard. The larger the K / S 正 value, the higher the apparent color yield.

[0088] The results are as Figure 2 shown. The color yield of the fabric surface using the pastes obtained in Examples 1-4 is 9%-15% higher than that of the comparative example, indicating that the films formed by the pastes obtained in Examples 1-4 have good moisture absorption, are more conducive to the dye entering the fiber interior, and are also easier to wash off, improving the dye uptake rate.

[0089] 5.3 Paste PVI value test

[0090] The rheology of the paste is represented by the PVI value, which is the ratio of the apparent viscosities at shear rates that differ by a factor of ten. The larger the PVI value, the lower the structure of the paste, the closer it is to a Newtonian fluid, and the better the rheology of the paste.

[0091] The formula for calculating the PVI value is as follows:

[0092] PVI = η 10i / η i

[0093] Where: i represents the shear rate; η i represents the apparent viscosity at a shear rate of i; η 10i represents the apparent viscosity at a shear rate of 10 times i.

[0094] Table 3 PVI values of the comparative example and examples

[0095] Item 4#60r Viscosity / cps 4#6r Viscosity / cps PVI Value Comparative Example 6390 12280 0.52 Example 1 6270 12540 0.50 Example 2 6330 13120 0.48 Example 3 6570 11550 0.57 Example 4 6260 11400 0.55 Trigonella gum 6100 16500 0.37

[0096] Note: The viscometer used for testing is a rotary viscometer NDJ-8S at room temperature.

[0097] As can be seen from Table 3, the rheology of fenugreek gum itself is very low, and the rheology of the pastes obtained in Examples 1-4 is comparable to that of sodium alginate in the comparative example. In particular, the rheology of the pastes obtained in Examples 3-4 is higher than that of the sodium alginate paste. In actual application, the PVI value of the examples can be flexibly adjusted according to the type of the customer's printing machine and the requirements of the block surface uniformity or the line fineness.

[0098] 5.4 Uneven color yield A

[0099] Randomly test 10 points on the front of the printed fabric for (K / S 正 ), calculate its dispersion A to characterize the color uniformity of the fabric surface. The larger the discrete value A, the more uneven the color on the fabric surface.

[0100] The formula for calculating the dispersion is as follows:

[0101]

[0102] In the formula, K / Si represents the K / S value of the i-th point, represents the average value of K / S of 10 points.

[0103] Table 4 Uneven color yield A% of the comparative examples and examples

[0104] Item A％ Comparative Example 8.31 Example 1 8.64 Example 2 8.93 Example 3 7.97 Example 4 8.26 Trigonella gum 9.41

[0105] As can be seen from Table 4, the dispersion of fenugreek gum is relatively high, and the dispersion of the pastes obtained in Examples 1-4 decreases significantly, indicating good printing uniformity. Moreover, the dispersion of the pastes obtained in Examples 3-4 is lower than that of sodium alginate, indicating that through the adjustment of the formula, its printing uniformity is higher than that of sodium alginate.

[0106] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A reactive printing thickening agent, characterized in that: By weight, it includes the following components: 50 - 70 parts of base material, 5 - 10 parts of humectant, 1 - 3 parts of shielding agent A, 10 - 30 parts of rheological agent, 5 - 8 parts of shielding agent B; 2 - 3 parts of defoaming agent; The base material is fenugreek gum; The humectant is lubrajel; The shielding agent A is fatty alcohol polyoxyethylene ether; The rheological agent is sodium carboxymethyl cellulose; The shielding agent B is phosphate; The viscosity of the base material is 10000 - 100000 mpa.s.

2. The reactive printing thickener according to claim 1, wherein: The viscosity of the lubrajel is CG or MS.

3. The reactive printing thickener according to claim 1 or 2, characterized in that: The polymerization degree of the fatty alcohol polyoxyethylene ether is 10 - 100.

4. The reactive printing thickener according to claim 1 or 2, characterized in that: The substitution degree of the sodium carboxymethyl cellulose is 1.5 - 2.0, and the viscosity is 50 - 100 mpa.s.

5. The reactive printing paste according to claim 1 or 2, characterized in that: The phosphate is sodium hexametaphosphate and / or sodium tripolyphosphate.

6. The reactive printing thickener according to claim 1 or 2, characterized in that: The defoaming agent is a mineral oil defoaming agent or a silicone defoaming agent.

7. The reactive printing thickener according to claim 1 or 2, characterized in that: The reactive printing paste is any one of the following (1) - (4): (1)62 parts of fenugreek gum, 5 parts of lubrajel, 3 parts of fatty alcohol polyoxyethylene ether, 20 parts of sodium carboxymethyl cellulose, 8 parts of phosphate, 2 parts of defoaming agent; (2)70 parts of fenugreek gum, 6 parts of lubrajel, 3 parts of fatty alcohol polyoxyethylene ether, 12 parts of sodium carboxymethyl cellulose, 6 parts of phosphate, 3 parts of defoaming agent; (3)50 parts of fenugreek gum, 10 parts of lubrajel, 3 parts of fatty alcohol polyoxyethylene ether, 30 parts of sodium carboxymethyl cellulose, 5 parts of phosphate, 2 parts of defoaming agent; (4)55 parts of fenugreek gum, 5 parts of lubrajel, 3 parts of fatty alcohol polyoxyethylene ether, 27 parts of sodium carboxymethyl cellulose, 7 parts of phosphate, 3 parts of defoaming agent.

8. The preparation method of the reactive printing paste according to any one of claims 1-7, characterized in that: It includes the following steps: (1)Add the base material into a reaction kettle and stir, then add the shielding agent A and stir; (2)Add the humectant and the rheological agent into the reaction kettle and continue to stir; (3)Add the defoaming agent into the reaction kettle and continue to stir; (4)Add the shielding agent B into the reaction kettle and stir to obtain the reactive printing paste.

9. The application of the reactive printing paste according to any one of claims 1 - 7 in the reactive printing of rayon.

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