Preparation method of antibacterial coating and coating process of antibacterial coating applied to antibacterial leather

Abstract

The preparation method comprises the following steps: dissolving rare earth oxide in concentrated acetic acid to prepare rare earth acetate, drying the rare earth acetate, dissolving the rare earth acetate in methanol, dissolving o-phenanthroline and 2, 2 '-dipyridyl in methanol, stirring, adding into a LaAc3 methanol solution, washing with methanol for several times, and drying to obtain the antibacterial coating. Putting into a vacuum dryer containing P4O10, and drying to obtain a powdery solid antibacterial material A; adding a pigment and a cross-linking agent, and stirring to obtain an antibacterial coating B; the invention relates to a finishing process of antibacterial leather. The finishing process comprises the following steps: normally producing crust leather in a large scale, manually scraping or brushing an antibacterial coating, hanging and drying, tumbling, normally spraying a top protective layer, tumbling, and softening by vibration to obtain an antibacterial leather finished product. The antibacterial coating is used as a novel antibacterial agent, and the rare earth organic complex has the characteristics of safety, environmental protection, high efficiency, durability and broad spectrum, is good in compatibility with high polymer materials, low in migration rate and good in durability, and has a very good antibacterial effect with low concentration.

Description

Technical Field

[0001] The invention relates to the technical field of leather manufacturing, in particular to a method for preparing an antibacterial coating and a finishing process thereof for applying the antibacterial coating to antibacterial leather. Background Art

[0002] As a typical collagen-based biomass material, leather is more likely to become a breeding ground for microorganisms due to its unique properties. Since leather products are not easy to wash frequently, simple wiping and drying can hardly completely remove residual sweat and dirt, which can accelerate the growth of bacteria and viruses under suitable conditions, causing odor, mildew and even rot, seriously affecting product quality and service life, and also posing a potential threat to the health of users.

[0003] Although traditional leather making processes have tried to combat mildew by adding mildew inhibitors, these mildew inhibitors are often accompanied by problems such as high toxicity, high cost, poor permeability and environmental pollution, and bacteria are prone to developing resistance to them. Even if antimicrobial agents are incorporated into the subsequent processing of leather products to achieve a certain antimicrobial and self-cleaning effect, these antimicrobial agents are easily decomposed and volatilized in the air, have poor antimicrobial durability, and may have adverse effects on the environment.

[0004] Therefore, in order to give leather and leather products more durable and efficient antibacterial properties, the current research focus is turning to the innovative development of antibacterial materials and the optimization and upgrading of leather making processes. Breakthroughs in this field will not only significantly improve the durability and hygiene standards of leather products, but will also create a safer and healthier living and working environment for humans, and promote a leap in the overall quality of life of society.

[0005] The inventor of this case devoted himself to research and development, which led to the creation of this case. Summary of the invention

[0006] The invention provides a method for preparing an antibacterial coating and a finishing process for applying the antibacterial coating to antibacterial leather, so as to overcome the problem that the leather has poor antibacterial performance.

[0007] The present invention adopts the following technical solution:

[0008] A method for preparing an antibacterial coating comprises the following steps:

[0009] Synthesis of antibacterial material A: rare earth oxide La2O3 was dissolved in concentrated acetic acid, evaporated to near dryness, and rare earth acetate LaAc3·3H2O was obtained. After drying, 20.0mmol was dissolved in 200ml methanol, 20.0mmol of 1,10-phenanthroline (Phen) and 20.0mmol of 2,2′-bipyridine (biPy) were dissolved in 20.0ml methanol, and stirred and added to the LaAc3 methanol solution, and a precipitate was gradually precipitated. The reaction was continued to stir at room temperature for 10h, and filtered after standing for 12h. The mixture was washed several times with methanol, and placed in a vacuum dryer containing P4O10, and dried for 48h to constant weight to obtain a powdered solid antibacterial material A, namely, a rare earth organic complex La(Ph en)(biP y)Ac3·H2O.

[0010] Preparation of antibacterial coating B: Take 100g of acrylic resin and 150g of polyurethane resin in a container and stir for 5 minutes to obtain a resin mixture; add 30g of diatomaceous earth and 10-20g of antibacterial material A and stir for 20-30 minutes, and use a thickener to adjust the viscosity to a No. 4 Ford cup for 30 seconds to obtain an antibacterial resin mixture; add 20g of pigment and 5g of cross-linking agent and stir for 5 minutes to obtain antibacterial coating B.

[0011] The coating process of antibacterial coating applied to antibacterial leather includes the following steps: normal mass production of leather → manual scraping or brushing of antibacterial coating B1-2 times → hanging and drying → tumbling once → normal spraying 2-3 times → top protective layer 1-2 times → tumbling once → vibration softening once → finished antibacterial leather product.

[0012] Furthermore, the amount of the antibacterial coating B applied manually by scraping or brushing is 2-3 g / SF each time.

[0013] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following advantages:

[0014] 1. Apply the antibacterial coating evenly on the leather by hand scraping or brushing, with a dosage of 2-3g / SF. A small amount can achieve a satisfactory antibacterial effect; hang the antibacterial coating to allow sufficient time to penetrate into the leather fibers, and dry it so that the cross-linking agent, acrylic resin, polyurethane resin and leather collagen fibers form a cross-linked resin film with strong adhesion, which wraps the rare earth complex in it and produces a lasting antibacterial effect; then follow the normal leather finishing process, and the resulting leather product has excellent antibacterial properties.

[0015] 2. As a new type of antibacterial agent, rare earth organic complexes are safe, environmentally friendly, efficient, durable and broad-spectrum. They do not contain heavy metal elements such as silver, zinc and copper, do not produce drug resistance, have good compatibility with polymer materials, low mobility, good durability, and have a good antibacterial effect at low concentrations. DETAILED DESCRIPTION

[0016] Example 1

[0017] A method for preparing an antibacterial coating comprises the following steps:

[0018] Synthesis of antibacterial material A: rare earth oxide La2O3 (purity> 9 9.9%) was dissolved in concentrated acetic acid and evaporated to near dryness to obtain rare earth acetate LaAc3·3H2O. After drying, 10.0 mmol was dissolved in 100 ml of methanol. 10.0 mmol of 1,10-phenanthroline (Phen) and 10.0 mmol of 2,2′-bipyridine (biPy) were dissolved in 10.0 ml of methanol and stirred and added to the LaAc3 methanol solution. A precipitate gradually precipitated. The reaction was continued under stirring at room temperature for 10 h. After standing for 1 to 2 h, the mixture was filtered, washed several times with methanol, and placed in a flask containing P4O 10 The mixture was placed in a vacuum dryer and dried for 48 h to constant weight to obtain a powdered solid antibacterial material A, namely a rare earth organic complex La(Ph en)(bi P y)Ac3·H2O.

[0019] Preparation of antibacterial coating B: Take 100 g of acrylic resin (SCL-400, Lanxess Co., Ltd.) and 150 g of polyurethane resin (Promul 59, Starr Fine Coatings Co., Ltd.) and stir in a container for 5 minutes to obtain a resin mixture; add 30 g of diatomaceous earth and 20 g of antibacterial material A and stir for 30 minutes, and use a thickener (RM-4414, Starr Fine Coatings Co., Ltd.) to adjust the viscosity to a No. 4 Ford cup for 30 seconds to obtain an antibacterial resin mixture; add 20 g of pigment and 5 g of cross-linking agent (XL-50, Lanxess Co., Ltd.) and stir for 5 minutes to obtain antibacterial coating B.

[0020] The coating process of antibacterial coating applied to antibacterial leather includes the following steps: normal mass production of crust leather → manual scraping of antibacterial coating B once → hanging and drying → tumbling once → normal spraying 3 times → top protective layer once → tumbling once → vibration softening once → finished antibacterial leather product.

[0021] The amount of the antibacterial coating B applied manually by scraping or brushing is 2 g / SF each time.

[0022] Example 2

[0023] A method for preparing an antibacterial coating comprises the following steps:

[0024] Synthesis of antibacterial material A: Rare earth oxide (La2O3, purity> 9 9.9%) was dissolved in concentrated acetic acid and evaporated to near dryness to obtain rare earth acetate (LaAc3·3H2O). After drying, 10.0 mmol was dissolved in 100 ml of methanol. 10.0 mmol of 1,10-phenanthroline (P hen) and 10.0 mmol of 2,2′-bipyridine (biPy) were dissolved in 10.0 ml of methanol and added to the LaAc3 methanol solution with stirring. A precipitate was gradually precipitated. The reaction was continued with stirring at room temperature for 10 h. After standing for 1 to 2 h, it was filtered, washed several times with methanol, and placed in a flask containing P4O 10 The mixture was placed in a vacuum dryer and dried for 48 h to constant weight to obtain a powdered solid antibacterial material A, namely a rare earth organic complex La(P hen)(bi P y)Ac3·H2O.

[0025] Preparation of antibacterial coating B: 100 g of acrylic resin (SCL-400, Lanxess Co., Ltd.) and 150 g of polyurethane resin (Promul 59, Starr Fine Coatings Co., Ltd.) were stirred in a container for 5 minutes to obtain a resin mixture; 30 g of diatomaceous earth and 10 g of antibacterial material A were added and stirred for 20 minutes, and the viscosity was adjusted to No. 4 Ford Cup for 30 seconds with a thickener (RM-4414, Starr Fine Coatings Co., Ltd.) to obtain an antibacterial resin mixture; 20 g of pigment and 5 g of crosslinking agent (XL-50, Lanxess Co., Ltd.) were added and stirred for 5 minutes to obtain antibacterial coating B.

[0026] The coating process of antibacterial coating applied to antibacterial leather includes the following steps: normal mass production of crust leather → manual brushing of antibacterial coating B 2 times → hanging and drying → tumbling once → normal spraying 3 times → top protective layer 1 time → tumbling once → vibration softening once → finished antibacterial leather product.

[0027] The amount of the antibacterial coating B applied manually by scraping or brushing is 3 g / SF each time.

[0028] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A method for preparing an antibacterial coating, characterized in that: The following steps are included: Synthesis of antibacterial material A: rare earth oxide La2O3 was dissolved in concentrated acetic acid and evaporated to near dryness to obtain rare earth acetate LaAc3·3H2O. After drying, 20.0mmol was dissolved in 200ml methanol. 20.0mmol of 1,10-phenanthroline (P hen) and 20.0mmol of 2,2′-bipyridine (biPy) were dissolved in 20.0ml methanol and stirred to add to LaAc3 methanol solution. Precipitation gradually precipitated. Stirring reaction was continued at room temperature for 10h. After standing for 12h, the mixture was filtered, washed with methanol several times, and placed in a flask containing P4O 10 The mixture was placed in a vacuum dryer and dried for 48 hours to a constant weight to obtain a powdered solid antibacterial material A, namely a rare earth organic complex La(P hen)(bi Py)Ac3·H2O; Preparation of antibacterial coating B: Take 100g of acrylic resin and 150g of polyurethane resin and stir them in a container for 5 minutes to obtain a resin mixture; add 30g of diatomaceous earth and 10-20g of antibacterial material A and stir for 20-30 minutes, and use a thickener to adjust the viscosity to a No. 4 Ford cup for 30 seconds to obtain an antibacterial resin mixture; add 20g of pigment and 5g of cross-linking agent and stir for 5 minutes to obtain antibacterial coating B.

2. The antibacterial coating according to claim 1 is applied to the finishing process of antibacterial leather, characterized in that: The process includes: normal mass production of leather → manual scraping or brushing of antibacterial coating B1-2 times → hanging and drying → tumbling once → normal spraying 2-3 times → top protective layer 1-2 times → tumbling once → softening once → finished antibacterial leather product.

3. The antibacterial coating as claimed in claim 2 is applied to the finishing process of antibacterial leather, characterized in that: The amount of the antibacterial coating B applied manually by scraping or brushing is 2-3 g / SF each time.