Functional leather with antibacterial and antiviral properties and preparation method thereof

Abstract

The present invention provides functional leather with antibacterial and antiviral properties and a preparation method thereof, wherein antibacterial and antiviral treatment is performed by loading a nano-photocatalyst material in a retanning and filling process and loading an antibacterial and antiviral agent DM-3015N in a fat-liquoring process, or a semi-finished leather is coated with a top coating liquid containing a nano-photocatalyst material and an antibacterial and antiviral agent DM-3015N to impart antibacterial and antiviral properties to the leather. On the one hand, the broad-spectrum antibacterial and antiviral properties of the antibacterial and antiviral agent DM-3015N, in conjunction with the nano-photocatalyst material, can be highly effective in antibacterial and antiviral properties; on the other hand, the present invention achieves a stable load of the antibacterial and antiviral agent DM-3015N and the nano-photocatalyst material on leather fibers through a specific process, thereby increasing the long-term effectiveness of the antibacterial and antiviral properties of the leather. The present invention can solve the problems that the long-term effectiveness and broad-spectrum properties of the existing method for preparing antibacterial and antiviral leather need to be improved, and that the color of the leather is easily adversely affected.

Description

Technical Field

[0001] The invention belongs to the field of leather processing and relates to functional leather with antibacterial and antiviral properties and a preparation method thereof. Background Art

[0002] Bacteria and viruses are everywhere, which has a great impact on human life. Bacteria are single-cell microorganisms with many species. After invading the body, they can cause a variety of diseases. Viruses are small, simple, non-cellular organisms that contain only one nucleic acid and must parasitize and replicate inside living cells. Viruses are more lethal than bacteria. After being invaded by viruses, cells can quickly produce many virus particles, which deplete the energy and material reserves of the cells, causing the cell membrane to completely rupture. As the virus spreads in the host, the cells will gradually lose their functions, die and disintegrate, and the host will become sick. Many human diseases are caused by viruses and bacteria, and bacteria and viruses are transmitted in various ways, such as contact, air, food and water.

[0003] As a classic bio-based material, leather products are not only daily necessities for people, but also have luxury attributes because of their beautiful texture, good durability and high quality. They have been widely used to make boots, bags, clothes, sofas and car seat cushions, etc. In recent years, they have also been widely used in furniture and home decoration. However, the base of this natural leather based on biological matrix is ​​an open collagen fiber bundle, which contains a certain amount of oil and other ingredients, which makes natural leather products easy to mold in a humid environment, and after long-term use, the surface and interior of natural leather are very easy to breed or adhere to bacteria and viruses, which poses great potential hazards to the health and even life of users. Although some existing leather and products are coated with a protective layer on the surface of the leather body during the manufacturing process, so that the leather surface has certain antibacterial and wear-resistant capabilities, and some antibacterial and mildew-proof agents are added during the leather manufacturing process, so that the leather has certain antibacterial and mildew-proof capabilities. However, the existing natural leather still generally has problems such as poor antibacterial persistence and single function, and it is difficult to play a persistent inhibitory effect on multiple bacteria and viruses at the same time.

[0004] CN202010574583.4 discloses an antibacterial and antiviral agent, antibacterial and antifungal leather and its preparation method and application, wherein the raw materials for preparing the antibacterial and antiviral agent include silver-doped nano bismuth tungstate, silver-doped nano titanium dioxide, chitosan, plant extract, dispersant and water, and the plant extract includes any one of honeysuckle extract, licorice extract, smilax glabra extract or houttuynia extract or a combination of at least two. The method utilizes the synergistic coordination of metal ions, photocatalysts, chitosan and natural plant extracts to achieve antibacterial and antiviral. However, plant extracts usually have a darker color, which will affect the color of the leather, especially the manufacture of light-colored leather will have a more adverse effect; at the same time, the method is antibacterial treatment by adding water and antibacterial and antiviral agents to the leather blank after tanning is completed and rotating for a period of time, and loading in this way, the antibacterial and antiviral agents will be mainly distributed in the leather surface layer, and the distribution of antibacterial and antiviral agents in the leather inner layer is relatively small, so its long-term antibacterial and antiviral performance needs to be improved. Therefore, how to give natural leather more efficient and long-lasting antibacterial and antiviral capabilities is one of the problems that urgently need to be solved. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a functional leather with antibacterial and antiviral properties and a preparation method thereof, so as to endow natural leather with more efficient and long-lasting antibacterial and antiviral capabilities.

[0006] The main technical concept of the present invention is: using the broad-spectrum antibacterial and antiviral properties of the antibacterial and antiviral agent DM-3015N, in conjunction with nano-photocatalyst materials for efficient antibacterial and antiviral, the key to the present invention is to stably load the antibacterial and antiviral agent DM-3015N on leather fibers or / and between leather fibers to enhance the long-term antibacterial and antiviral capabilities. The antibacterial and antiviral agent DM-3015N is currently mainly used for surface antibacterial and antiviral treatment of textiles, generally loaded on the surface of textiles by dipping, padding or spraying, but there is no report on the use of the antibacterial and antiviral agent DM-3015N for natural leather for antibacterial and antiviral purposes, and the main difficulty is that it is difficult to stably load DM-3015N on leather fibers. Therefore, how to effectively and stably load the antibacterial and antiviral agent DM-3015N on the leather fibers of natural leather or between the leather fibers to give natural leather long-term and broad-spectrum antibacterial and antiviral properties is a technical problem that the present invention hopes to solve.

[0007] To achieve the above-mentioned purpose, the present invention provides the following two technical solutions to prepare functional leather with antibacterial and antiviral properties:

[0008] The first technical solution: a method for preparing functional leather with antibacterial and antiviral properties, comprising the following steps:

[0009] (1) Put 100 parts by weight of shaved blue wet leather into a drum, add 120-150 parts by weight of water at 30-40°C, 0.3-0.6 parts by weight of a wetting agent, and 0.5-1.5 parts by weight of a fatliquor, rotate the drum for 40-80 minutes, drain the bath liquid, wash with water, and drain;

[0010] (2) Add 120-150 parts by weight of water at 30-40°C and 1-3 parts by weight of sodium formate to the drum, rotate the drum for 30-45 minutes, add baking soda and rotate the drum to adjust the pH value of the bath liquid to 5.1-5.3, drain the bath liquid, wash with water, and drain;

[0011] (3) Add 80-100 parts by weight of water at 30-40°C and 10-35 parts by weight of retanning filler into a drum, rotate the drum for 0-120 min, add 1-3 parts by weight of nano-photocatalyst material, rotate the drum for 90-150 min, add 80-100 parts by weight of water at 35-40°C, add formic acid and rotate the drum to adjust the pH value of the bath to 4-4.2, and drain the bath;

[0012] (4) Add 150 parts by weight of water at 40-45°C, 8-15 parts by weight of fatliquor, and 1-5 parts by weight of antibacterial and antiviral agent DM-3015N into a drum, rotate the drum for 60-90 min, add formic acid and rotate the drum to adjust the pH value of the bath liquid to 3.5-3.6, drain the bath liquid, remove the skins, strap, and dry;

[0013] (5) Finishing the leather obtained in step (4) to obtain functional leather with antibacterial and antiviral properties.

[0014] In the above-mentioned first technical solution, the retanning filling material includes at least one of Magnopal PGN, Synthol 991, Optitan TD 626L, Safetan DD001, Syntan FP888, Syntan S, and Relugan DLF.

[0015] In the above-mentioned first technical solution, the fatliquor includes at least one of Synthol PF991, Synthol WP, PolyolAK, Synthol GS606, and Synthol MC-K.

[0016] In the first technical solution, the wetting agent is a conventional wetting agent used in leather processing, for example, the wetting agent Lipidol WD191.

[0017] In the above-mentioned first technical solution, the nano-photocatalyst material is nano-titanium dioxide.

[0018] In step (2) of the first technical solution, the drum is rotated for 90 to 120 minutes after adding baking soda, and then the bath liquid is discharged.

[0019] In step (4) of the first technical solution, when adding formic acid to adjust the pH value of the bath liquid, the diluted formic acid is added to the drum in 2 to 4 portions, and the drum is rotated after each addition of the diluted formic acid to evenly disperse the formic acid in the bath liquid.

[0020] The second technical solution: a method for preparing functional leather with antibacterial and antiviral properties, comprising the following steps:

[0021] (1) Dispersing 0-250 parts by weight of a brightener, 0-5 parts by weight of a hand feeling agent, 0-1 parts by weight of a cross-linking agent, 3-6 parts by weight of an antibacterial and antiviral agent DM-3015N, and 0.5-1.5 parts by weight of a nano-photocatalyst material in 200 parts by weight of water to obtain a top coating liquid;

[0022] (2) Apply the top coating liquid evenly on the surface of the semi-finished leather, and then dry it. The coating amount is controlled to be 15~40g / ft 2 The semi-finished leather is a leather blank that has been retanned, fatliquored, dyed and subjected to a base coating or a base coating and a middle coating, or a leather blank that has been retanned, fatliquored, dyed but not subjected to a base coating and a middle coating;

[0023] (3) Ironing the leather treated in step (2) at 120-160° C. to obtain functional leather with antibacterial and antiviral properties.

[0024] Furthermore, in the above-mentioned second technical solution, the semi-finished leather is a leather blank obtained by the operation of steps (1) to (4) of the method described in claim 1 and dyeing, or a leather blank obtained by the operation of steps (1) to (4) of the method described in claim 1 and dyeing, and then subjected to a base coating or a base coating and a middle coating.

[0025] In the above second technical solution, the nano photocatalyst material is nano titanium dioxide.

[0026] In step (2) of the second technical solution, the top coating liquid is evenly applied to the surface of the semi-finished leather by spraying or rolling to perform surface coating.

[0027] In step (1) of the second technical solution, preferably 10-250 parts by weight of brightener, 0.3-5 parts by weight of feel agent, 0.5-1 parts by weight of crosslinking agent, 3-6 parts by weight of antibacterial and antiviral agent DM-3015N, and 0.5-1.5 parts by weight of nano-photocatalyst material are fully dispersed in 200 parts by weight of water to obtain a top coating liquid.

[0028] In the second technical solution mentioned above, the nano-photocatalyst material and the antibacterial and antiviral agent DM-3015N are mixed with a leather finishing agent (such as a brightener, a feel agent and a cross-linking agent, etc.) and then coated. The leather finishing agent can protect the nano-photocatalyst material and the antibacterial and antiviral agent DM-3015N. At the same time, the leather finishing agent can seal the nano-photocatalyst material and the antibacterial and antiviral agent DM-3015N in the coating layer, thereby increasing the binding stability of the two on the surface of the leather board.

[0029] The present invention also provides functional leather with antibacterial and antiviral properties prepared by the above two technical solutions.

[0030] Compared with the prior art, the technical solution of the present invention produces the following beneficial technical effects:

[0031] 1. The present invention provides a method for preparing functional leather with antibacterial and antiviral properties, wherein the antibacterial and antiviral treatment is performed by loading the nano-photocatalyst material in the retanning and filling process and loading the antibacterial and antiviral agent DM-3015N in the fat-liquoring process, or the semi-finished leather is coated with a top coating liquid containing the nano-photocatalyst material and the antibacterial and antiviral agent DM-3015N to give the leather antibacterial and antiviral properties. On the one hand, the broad-spectrum antibacterial and antiviral properties of the antibacterial and antiviral agent DM-3015N, in conjunction with the nano-photocatalyst material, can be highly effective in antibacterial and antiviral properties; on the other hand, the present invention achieves a stable load of the antibacterial and antiviral agent DM-3015N and the nano-photocatalyst material on the leather fiber through a specific process, which can reduce the loss of the two during the use of leather products and increase the long-term effectiveness of the antibacterial and antiviral properties of the leather. At the same time, the method of the present invention will not have an adverse effect on the color of the leather itself, and is very beneficial for producing light-colored leather with antibacterial and antiviral properties. In summary, the method of the present invention can solve the problems of the existing methods for preparing antibacterial and antiviral leather, namely, the long-term effectiveness and broad-spectrum properties need to be improved, and the color of the leather is easily adversely affected.

[0032] 2. The present invention confirms through experiments that the antibacterial and antiviral functional leather prepared by the method of the present invention has an antibacterial rate of >99% against Staphylococcus aureus, Klebsiella pneumoniae and Candida albicans before use. After 12 months of use, the antibacterial rate against Staphylococcus aureus only decreases by 6% to 15%, the antibacterial rate against Klebsiella pneumoniae only decreases by 8% to 17%, and the antibacterial rate against Candida albicans only decreases by 5% to 14%, indicating that the antibacterial property of the functional leather prepared by the method of the present invention has excellent long-term effectiveness.

[0033] 3. The method of the present invention can perform antibacterial treatment on the leather blank during the retanning and filling process and the fatliquoring process, load the nano-photocatalyst material and the antibacterial and antiviral agent DM-3015N, or load the aforementioned two antibacterial and antiviral materials through the top coating process, without adding a special antibacterial and antiviral treatment step separately, and thus will not increase the production process of the functional leather. The production of antibacterial and antiviral functional leather can be achieved using the existing production line, which has the advantage of being easy to realize industrial production. Specific implementation methods

[0034] The functional leather with antibacterial and antiviral properties provided by the present invention and the preparation method thereof are further described by way of examples. It is necessary to point out that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the protection scope of the present invention. The technical personnel in the relevant field can make some non-essential improvements and adjustments to the present invention based on the above invention content, which still fall within the protection scope of the present invention.

[0035] The wetting agent Lipidol WD191, the fatting agent Synthol PF991, SyntholWP, Polyol AK, Synthol GS606, Synthol MC-K, the retanning filling material Magnopal PGN, Synthol 991, Optitan TD 626L, Safetan DD001, Syntan FP888, Syntan S, Relugan DLF, the brightener PU-3585, PU-3586 used in the following embodiments can all be directly purchased from the market. The hand feeling agent, crosslinking agent, nano titanium dioxide and other agents used in the following embodiments can all be directly purchased from the market, for example, the hand feeling agent HM-183 and the crosslinking agent Picassian XL-725 can all be purchased from STAHL.

[0036] The antibacterial and antiviral agent DM-3015N used in the following embodiments is produced by Guangdong Demei Fine Chemical Group Co., Ltd. DM-3015N has a special water-oil amphiphilic structure that can disrupt and destroy the envelope of membrane-bound RNA viruses composed of proteins and phospholipids. When the envelope is destroyed, RNA is also very easy to degrade, thereby inactivating the virus.

[0037] Example 1

[0038] In this embodiment, a method for preparing cowhide shoe upper leather with antibacterial and antiviral properties is provided, and the steps are as follows:

[0039] (1) Rehumidification

[0040] 100 parts by weight of shaved cowhide wet blue leather was put into a drum, and 150 parts by weight of water at 40°C, 0.5 parts by weight of wetting agent Lipidol WD191, and 1 part by weight of fatliquor Synthol PF991 were added. The drum was rotated for 60 minutes, the bath liquid was drained, the leather was washed once with water, and the water was drained.

[0041] (2) Neutralization

[0042] Add 150 parts by mass of water at 35°C and 2 parts by mass of sodium formate into the drum, rotate the drum for 45 minutes, add 0.5 parts by mass of baking soda, rotate the drum for 90 minutes, at which time the pH value of the bath liquid is about 5.2, drain the bath liquid, wash once with water, and drain.

[0043] (3) Filling

[0044] Add 80 parts by mass of water at 35°C to a drum, add 6 parts by mass of retanning filler Magnopal PGN and 1 part by mass of Synthol 991, rotate the drum for 60 min, add 10 parts by mass of retanning filler Optitan TD 626L and 10 parts by mass of Safetan DD001, rotate the drum for 60 min, then add 2 parts by mass of retanning filler Syntan FP888, 5 parts by mass of Syntan S and 1 part by mass of Synthol 991, add 1.5 parts by mass of nano titanium dioxide, rotate the drum for 120 min, add 100 parts by mass of water at 40°C, 2 parts by mass of formic acid (dilute the formic acid 5 to 10 times and add it in 2 times, rotate the drum after the first addition to mix the bath liquid evenly, and then add the diluted formic acid again), rotate the drum for 60 min, at this time the pH of the bath liquid is about 4.1, and the bath liquid is discharged.

[0045] (4) Fat addition

[0046] Add 150 parts by mass of water at 45°C, 6 parts by mass of fatliquor Synthol WP, 2 parts by mass of Polyol AK, 4 parts by mass of Synthol GS606 to the drum, add 2 parts by mass of antibacterial and antiviral agent DM-3015N, rotate the drum for 60 min, add 1.5 parts by mass of formic acid, rotate the drum for 45 min, at this time the pH value of the bath liquid is about 3.6, drain the bath liquid, remove the skins, mount the skins, and dry.

[0047] (5) Post-processing

[0048] The leather blank obtained in step (4) is finished to obtain a cowhide shoe upper leather with antibacterial and antiviral properties.

[0049] The antibacterial rate of the cowhide upper leather prepared in this embodiment was tested according to the bacterial liquid absorption method in Appendix B of QB / T 2881-2013, and the results showed that the antibacterial rate against Staphylococcus aureus was greater than 99%, the antibacterial rate against Klebsiella pneumoniae was greater than 99%, and the antibacterial rate against Candida albicans was greater than 99%. After the cowhide upper leather prepared in this embodiment was used for 12 months, the antibacterial rate was tested according to the bacterial liquid absorption method in Appendix B of QB / T2881-2013, and the antibacterial rate against Staphylococcus aureus was greater than 89%, the antibacterial rate against Klebsiella pneumoniae was greater than 85%, and the antibacterial rate against Candida albicans was greater than 90%. Compared with before use, the corresponding antibacterial rates were only reduced by 10.10%, 14.14% and 9.09%, respectively.

[0050] Comparative Example 1

[0051] In this comparative example, the antibacterial and antiviral agent DM-3015N and nano-titanium dioxide were loaded using a process different from that in Example 1, and the differences in the long-term antibacterial and antiviral properties of the prepared cowhide upper leather were compared.

[0052] (1) Rehumidification

[0053] The operation is the same as step (1) of Example 1.

[0054] (2) Neutralization

[0055] The operation is the same as step (2) of Example 1.

[0056] (3) Filling

[0057] Add 80 parts by mass of water at 35°C to a drum, add 6 parts by mass of retanning filler Magnopal PGN and 1 part by mass of Synthol 991, rotate the drum for 60 min, add 10 parts by mass of retanning filler Optitan TD 626L and 10 parts by mass of Safetan DD001, rotate the drum for 60 min, then add 2 parts by mass of retanning filler Syntan FP888, 5 parts by mass of Syntan S and 1 part by mass of Synthol 991, add 100 parts by mass of water at 40°C, 2 parts by mass of formic acid (dilute the formic acid 5 to 10 times and add it in 2 times, rotate the drum after the first addition to mix the bath liquid evenly, and then add the diluted formic acid again), rotate the drum for 60 min, at which time the pH of the bath liquid is about 4.1, and the bath liquid is discharged.

[0058] (4) Fat addition

[0059] Add 150 parts by mass of water at 45°C, 6 parts by mass of fatliquor Synthol WP, 2 parts by mass of Polyol AK, 4 parts by mass of Synthol GS606, and 1.5 parts by mass of formic acid into the drum, rotate the drum for 45 minutes, at which time the pH value of the bath liquid is about 3.6, and discharge the bath liquid.

[0060] (5) Antibacterial and antiviral treatment

[0061] Add 150 parts by weight of water at 45° C., 1.5 parts by weight of nano titanium dioxide, and 2 parts by weight of antibacterial and antiviral agent DM-3015N into the drum, rotate the drum for 120 minutes, drain the bath liquid, remove the skin, mount the skin, and dry.

[0062] (6) Post-processing

[0063] The leather blank obtained in step (5) is finished to obtain a cowhide shoe upper leather with antibacterial and antiviral properties.

[0064] The antibacterial rate of the cowhide upper leather prepared in this comparative example was tested according to the bacterial liquid absorption method in Appendix B of QB / T 2881-2013, and the results showed that the antibacterial rate against Staphylococcus aureus was greater than 99%, the antibacterial rate against Klebsiella pneumoniae was greater than 99%, and the antibacterial rate against Candida albicans was greater than 99%. After the cowhide upper leather prepared in this comparative example was used for 12 months under the same environment as the cowhide upper leather prepared in Example 1, the antibacterial rate was tested according to the bacterial liquid absorption method in Appendix B of QB / T 2881-2013, and the antibacterial rate against Staphylococcus aureus was greater than 68%, the antibacterial rate against Klebsiella pneumoniae was greater than 62%, and the antibacterial rate against Candida albicans was greater than 69%. Compared with before use, the corresponding antibacterial rates decreased by 30.18%, 36.25% and 29.43%, respectively.

[0065] Combining Example 1 and Comparative Example 1, it can be seen that the present invention effectively improves the long-term antibacterial performance of the prepared cowhide upper by loading nano-titanium dioxide during the retanning and filling process and loading the antibacterial and antiviral agent DM-3015N during the fat-liquoring process. This is mainly because the process adopted by the present invention can fully promote the nano-titanium dioxide and the loaded antibacterial and antiviral agent DM-3015N to fully penetrate into the leather fibers, and more combine with the leather fibers inside the leather board, thereby increasing the binding stability of the two with the leather fibers inside the leather board. Since the loaded antibacterial and antiviral agent DM-3015N also has antibacterial and antiviral properties, as its binding stability with the leather fibers increases, the long-term antiviral performance of the leather will also increase.

[0066] Example 2

[0067] In this embodiment, a method for preparing sheepskin shoe lining leather with antibacterial and antiviral properties is provided, and the steps are as follows:

[0068] (1) Rehumidification

[0069] 100 parts by weight of shaved sheepskin blue wet leather was put into a drum, and 150 parts by weight of water at 40°C, 0.5 parts by weight of wetting agent Lipidol WD191, and 0.5 parts by weight of fatliquor Synthol PF991 were added. The drum was rotated for 60 minutes, the bath liquid was drained, the leather was washed once with water, and the water was drained.

[0070] (2) Neutralization

[0071] Add 150 parts by mass of water at 35°C and 1.5 parts by mass of sodium formate into the drum, rotate the drum for 45 minutes, add 0.5 parts by mass of baking soda, rotate the drum for 90 minutes, at which time the pH value of the bath liquid is about 5.2, drain the bath liquid, wash once with water, and drain.

[0072] (3) Filling

[0073] Add 80 parts by mass of water at 35°C to a drum, add 10 parts by mass of retanning filler Relugan DLF and 1 part by mass of Synthol 991, rotate the drum for 60 min, add 10 parts by mass of retanning filler Optitan TD 626L, rotate the drum for 60 min, then add 2 parts by mass of retanning filler Syntan FP888, 4 parts by mass of Syntan S and 1 part by mass of Synthol991, add 3 parts by mass of nano titanium dioxide, rotate the drum for 120 min, add 100 parts by mass of water at 40°C and 2 parts by mass of formic acid (dilute the formic acid 5 to 10 times and add it in 2 times. After the first addition, rotate the drum to mix the bath liquid evenly, and then add the diluted formic acid again), rotate the drum for 60 min, at which time the pH of the bath liquid is about 4.1, and the bath liquid is discharged.

[0074] (4) Fat addition

[0075] Add 150 parts by mass of water at 45°C, 6 parts by mass of fatliquor Synthol WP, 3 parts by mass of Synthol MC-K, 4 parts by mass of Synthol GS606, add 3 parts by mass of antibacterial and antiviral agent DM-3015N, rotate the drum for 60 minutes, add 1.5 parts by mass of formic acid, rotate the drum for 45 minutes, at this time the pH value of the bath liquid is about 3.6, drain the bath liquid, remove the skins, mount the skins, and dry.

[0076] (5) Post-processing

[0077] The leather blank obtained in step (4) is finished to obtain sheepskin shoe lining leather with antibacterial and antiviral properties.

[0078] The sheepskin shoe lining leather prepared in this embodiment was tested for antibacterial rate according to the bacterial solution absorption method in Appendix B of QB / T 2881-2013, and the results showed that the antibacterial rate against Staphylococcus aureus was greater than 99%, the antibacterial rate against Klebsiella pneumoniae was greater than 99%, and the antibacterial rate against Candida albicans was greater than 99%. After the sheepskin shoe lining leather prepared in this embodiment was used for 12 months, the antibacterial rate was tested according to the bacterial solution absorption method in Appendix B of QB / T2881-2013, and the results showed that the antibacterial rate against Staphylococcus aureus was greater than 90%, the antibacterial rate against Klebsiella pneumoniae was greater than 86%, and the antibacterial rate against Candida albicans was greater than 90%. Compared with before use, the corresponding antibacterial rates were only reduced by 9.13%, 12.35% and 8.37%, respectively.

[0079] Example 3

[0080] In this embodiment, a method for preparing cowhide furniture leather with antibacterial and antiviral properties is provided, and the steps are as follows:

[0081] (1) 100 parts by mass of brightener PU-3585, 150 parts by mass of PU-3586, 0.3 parts by mass of feel agent HM-183, 0.5 parts by mass of crosslinking agent Picassian XL-725, 4 parts by mass of antibacterial and antiviral agent DM-3015N, and 0.8 parts by mass of nano titanium dioxide were fully dispersed in 200 parts by mass of water to obtain a top coating liquid.

[0082] (2) Spray the top coating liquid evenly on the surface of the semi-finished leather, and then dry it. Control the coating amount to 25g / ft 2 The semi-finished leather is a cowhide leather blank that has been retanned, fatliquored, dyed, and has been subjected to bottom layer coating and middle layer coating.

[0083] (3) The leather treated in step (2) is ironed at 130° C. and 5 Bar for 5 s to obtain cowhide furniture leather with antibacterial and antiviral properties.

[0084] The cowhide furniture leather prepared in this embodiment was tested for antibacterial rate according to the bacterial liquid absorption method in Appendix B of QB / T 2881-2013, and the results showed that the antibacterial rate against Staphylococcus aureus was greater than 99%, the antibacterial rate against Klebsiella pneumoniae was greater than 99%, and the antibacterial rate against Candida albicans was greater than 99%. After the cowhide furniture leather prepared in this embodiment was used for 12 months, the antibacterial rate was tested according to the bacterial liquid absorption method in Appendix B of QB / T2881-2013, and the results showed that the antibacterial rate against Staphylococcus aureus was greater than 84%, the antibacterial rate against Klebsiella pneumoniae was greater than 81%, and the antibacterial rate against Candida albicans was greater than 85%. Compared with before use, the corresponding antibacterial rates decreased by 15.01%, 17.64% and 14.32%, respectively.

[0085] Example 4

[0086] In this embodiment, a method for preparing cowhide furniture leather with antibacterial and antiviral properties is provided, and the steps are as follows:

[0087] (1) 100 parts by mass of brightener PU-3585, 150 parts by mass of PU-3586, 0.3 parts by mass of feel agent HM-183, 0.5 parts by mass of crosslinking agent Picassian XL-725, 4 parts by mass of antibacterial and antiviral agent DM-3015N, and 0.8 parts by mass of nano titanium dioxide were fully dispersed in 200 parts by mass of water to obtain a top coating liquid.

[0088] (2) 100 parts by weight of shaved cowhide wet blue leather was placed in a drum, and 150 parts by weight of water at 40°C, 0.5 parts by weight of wetting agent Lipidol WD191, and 1 part by weight of fatliquor Synthol PF991 were added. The drum was rotated for 60 min, the bath liquid was drained, the leather was washed once with water, and the water was drained.

[0089] (3) Add 150 parts by weight of water at 35°C and 2 parts by weight of sodium formate to the drum, rotate the drum for 45 minutes, add 0.5 parts by weight of baking soda, and rotate the drum for 90 minutes. At this time, the pH value of the bath liquid is about 5.2. Drain the bath liquid, rinse once with water, and drain.

[0090] (4) Add 80 parts by weight of water at 35°C to a drum, add 6 parts by weight of retanning filler Magnopal PGN and 1 part by weight of Synthol 991, and rotate the drum for 60 min. Add 10 parts by weight of retanning filler Optitan TD 626L and 10 parts by weight of Safetan DD001, and rotate the drum for 60 min. Then add 2 parts by weight of retanning filler Syntan FP888, 5 parts by weight of Syntan S and 1 part by weight of Synthol 991, add 1.5 parts by weight of nano titanium dioxide, and rotate the drum for 120 min. Add 100 parts by weight of water at 40°C and 2 parts by weight of formic acid (dilute the formic acid 5 to 10 times and add it in two times. After the first addition, rotate the drum to mix the bath liquid evenly, and then add the diluted formic acid again). Rotate the drum for 60 min. At this time, the pH of the bath liquid is about 4.1, and the bath liquid is discharged.

[0091] (5) Add 150 parts by weight of water at 45°C, 6 parts by weight of Synthol WP, 2 parts by weight of Polyol AK, 4 parts by weight of Synthol GS606, and 2 parts by weight of DM-3015N, an antibacterial and antiviral agent, into a drum and rotate the drum for 60 minutes. Add 1.5 parts by weight of formic acid and rotate the drum for 45 minutes. At this time, the pH value of the bath liquid is about 3.6. Drain the bath liquid, remove the skins, mount the skins, and dry them.

[0092] (6) The leather obtained in step (5) is dyed, primed and middled according to conventional techniques to obtain a semi-finished leather. The top-layer finishing liquid is evenly sprayed on the surface of the semi-finished leather and then dried. The coating amount is controlled to be 25 g / ft 2 .

[0093] (7) The leather treated in step (5) is ironed at 130° C. and 5 Bar for 5 s to obtain cowhide furniture leather with antibacterial and antiviral properties.

[0094] The antibacterial rate of the cowhide furniture leather prepared in this embodiment was tested according to the bacterial liquid absorption method in Appendix B of QB / T 2881-2013, and the results showed that the antibacterial rate against Staphylococcus aureus was greater than 99%, the antibacterial rate against Klebsiella pneumoniae was greater than 99%, and the antibacterial rate against Candida albicans was greater than 99%. After the cowhide furniture leather prepared in this embodiment was used for 12 months, the antibacterial rate was tested according to the bacterial liquid absorption method in Appendix B of QB / T2881-2013, and the results showed that the antibacterial rate against Staphylococcus aureus was greater than 93%, the antibacterial rate against Klebsiella pneumoniae was greater than 91%, and the antibacterial rate against Candida albicans was greater than 93%. Compared with before use, the corresponding antibacterial rates were only reduced by 6.18%, 8.13% and 5.62%, respectively.

[0095] In combination with Examples 1, 3, and 4, it can be known that the present invention can further improve the long-term antibacterial performance of the prepared leather by further loading nano titanium dioxide and loaded antibacterial and antiviral agent DM-3015N through surface coating operation on the basis of loading nano titanium dioxide and loaded antibacterial and antiviral agent DM-3015N in the retanning filling process and the fat-liquoring process. This is mainly because the present invention can fully promote the nano titanium dioxide and loaded antibacterial and antiviral agent DM-3015N to fully penetrate into the leather fibers through the retanning filling and fat-liquoring process, and more combine with the leather fibers inside the leather board, thereby increasing the binding stability of the two with the leather fibers inside the leather board, and through the surface coating process, a protective layer can be formed on the surface of the leather board together with the leather finishing agent, and at the same time, under the action of the finishing agent, the nano titanium dioxide and loaded antibacterial and antiviral agent DM-3015N can be enclosed in the coating layer, which further increases the binding stability of the two on the surface of the leather board, which is conducive to further improving the long-term antibacterial performance of the leather. As mentioned above, since the antibacterial and antiviral agent DM-3015N also has antibacterial and antiviral properties, the increase in its stability of binding to the interior and surface of the leather means that the long-term effectiveness of the leather's antiviral properties will also increase.

Claims

1. A method for preparing functional leather with antibacterial and antiviral properties, characterized in that: The following steps are involved: (1) Put 100 parts by weight of shaved blue wet leather into a drum, add 120-150 parts by weight of water at 30-40°C, 0.3-0.6 parts by weight of a wetting agent, and 0.5-1.5 parts by weight of a fatliquor, rotate the drum for 40-80 minutes, drain the bath liquid, wash with water, and drain; (2) Add 120-150 parts by weight of water at 30-40°C and 1-3 parts by weight of sodium formate to the drum, rotate the drum for 30-45 minutes, add baking soda and rotate the drum to adjust the pH value of the bath liquid to 5.1-5.3, drain the bath liquid, wash with water, and drain; (3) adding 80-100 parts by weight of water at 30-40°C and 10-35 parts by weight of retanning filler into a drum, rotating the drum for 0-120 min, adding 1-3 parts by weight of nano-photocatalyst material, rotating the drum for 90-150 min, adding 80-100 parts by weight of water at 35-40°C, adding formic acid and rotating the drum to adjust the pH value of the bath to 4-4.2, and discharging the bath; the nano-photocatalyst material is nano-titanium dioxide; (4) Add 150 parts by weight of water at 40-45°C, 8-15 parts by weight of fatliquor, and 1-5 parts by weight of antibacterial and antiviral agent DM-3015N into a drum, rotate the drum for 60-90 min, add formic acid and rotate the drum to adjust the pH value of the bath liquid to 3.5-3.6, drain the bath liquid, remove the skins, strap, and dry; (5) Finishing the leather obtained in step (4) to obtain functional leather with antibacterial and antiviral properties.

2. The method for preparing the functional leather with antibacterial and antiviral properties according to claim 1, characterized in that: The retanning filling material comprises at least one of Magnopal PGN, Safetan DD001, Syntan FP888 and Relugan DLF.

3. The method for preparing the functional leather with antibacterial and antiviral properties according to claim 1, characterized in that: The fatliquor includes at least one of Synthol WP, Polyol AK, Synthol GS606, and Synthol MC-K.

4. The method for preparing the functional leather with antibacterial and antiviral properties according to any one of claims 1 to 3, characterized in that: In step (2), after adding baking soda, the drum is rotated for 90 to 120 minutes, and then the bath liquid is discharged.

5. The method for preparing the functional leather with antibacterial and antiviral properties according to any one of claims 1 to 3, characterized in that: In step (4), when formic acid is added to adjust the pH value of the bath liquid, the diluted formic acid is added to the drum in 2 to 4 portions, and the drum is rotated after each addition of the diluted formic acid to uniformly disperse the formic acid in the bath liquid.

6. A method for preparing functional leather with antibacterial and antiviral properties, characterized in that: The following steps are involved: (1) Dispersing 0-250 parts by weight (not equal to 0) of a brightener, 0-5 parts by weight (not equal to 0) of a hand-feeling agent, 0-1 parts by weight (not equal to 0) of a cross-linking agent, 3-6 parts by weight of an antibacterial and antiviral agent DM-3015N, and 0.5-1.5 parts by weight of a nano-photocatalyst material in 200 parts by weight of water to obtain a top coating liquid; the nano-photocatalyst material is nano-titanium dioxide; (2) Apply the top coating liquid evenly on the surface of the semi-finished leather, and then dry it. The coating amount is controlled to be 15~40g / ft 2 The semi-finished leather is a leather blank that has been retanned, fatliquored, dyed and subjected to a base coating or a base coating and a middle coating, or a leather blank that has been retanned, fatliquored, dyed but not subjected to a base coating and a middle coating; (3) Ironing the leather treated in step (2) at 120-160° C. to obtain functional leather with antibacterial and antiviral properties.

7. The method for preparing the functional leather with antibacterial and antiviral properties according to claim 6, characterized in that: The semi-finished leather is a leather blank obtained by the operation of steps (1) to (4) of the method according to any one of claims 1 to 3 and dyeing, or a leather blank obtained by the operation of steps (1) to (4) of the method according to claim 1 and dyeing, and subjected to a base coating or a base coating and a middle coating.

8. Functional leather with antibacterial and antiviral properties prepared by the method according to any one of claims 1 to 7.