Antibacterial silicone leather and preparation method thereof

Abstract

The invention discloses an antibacterial silicone leather, including a silicone surface layer, an adhesive layer arranged on the silicone surface layer, and a leather embryo covered on the adhesive layer and sprayed with an antibacterial agent on the surface; the antibacterial agent includes the following raw materials by mass: 35-50 parts of honeysuckle, 20-30 parts of arborvitae essential oil, 3-8 parts of clove essential oil, 2-7 parts of aloe, 20-30 parts of nano titanium dioxide, 25-35 parts of diatomaceous earth and 10-20 parts of ethanol. The antibacterial silicone leather of the present invention and its preparation method are reasonably proportioned by the arborvitae essential oil and clove essential oil in the antibacterial agent, and mixed with the aloe and honeysuckle in the antibacterial agent, so that not only the antibacterial property of the silicone leather sprayed with the antibacterial agent is significantly improved, but also the yellowing resistance and water washing resistance of the leather can be improved, and the service life of the silicone leather can be extended.

Description

Technical Field

[0001] The present invention relates to the technical field of leather production, and particularly relates to an antibacterial silicone leather and a preparation method thereof. Background Art

[0002] Leather is the animal skin that has been denatured and is not easily decayed through physical and chemical processes such as hair removal and tanning. Silicone leather belongs to a kind of artificial leather. Artificial leather is made by foaming or laminating various formulations of PVC, PU, etc. on a textile fabric base or a non-woven fabric base. Artificial leather is mainly used in products such as clothing, automotive interiors, and furniture. After long-term use of artificial silicone leather, it is prone to bacterial growth during the rainy season. The existing leather has poor antibacterial performance, which will cause the leather to change color and deteriorate over time, resulting in damage to the leather. Moreover, artificial leather is extremely prone to yellowing or water washing damage after long-term use, thereby shortening the service life of the leather. Summary of the Invention

[0003] The main purpose of the present invention is to provide an antibacterial silicone leather and a preparation method thereof, which can effectively solve the problems in the background art.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] An antibacterial silicone leather includes a silicone surface layer, and further includes an adhesive layer provided on the silicone surface layer and a leather embryo covering the adhesive layer and sprayed with an antibacterial agent on the surface.

[0006] The antibacterial agent includes the following raw materials by mass parts: 35 - 50 parts of honeysuckle, 20 - 30 parts of Platycladus orientalis essential oil, 3 - 8 parts of clove essential oil, 2 - 7 parts of aloe, 20 - 30 parts of nano-titanium dioxide, 25 - 35 parts of diatomite, and 10 - 20 parts of ethanol.

[0007] As a further optimized scheme of the present invention, the adhesive layer includes the following raw materials by mass parts: 55 - 65 parts of methyl vinyl siloxane, 0.5 - 1 part of polymethylhydrosiloxane, 0.2 - 0.5 part of platinum catalyst, 5 - 10 parts of phenyl silicone rubber, and 25 - 45 parts of fumed silica.

[0008] As a further optimized scheme of the present invention, the silicone surface layer includes the following raw materials by mass parts: 50 - 60 parts of polysiloxane, 25 - 35 parts of fumed silica, 0.02 - 0.2 part of platinum catalyst, 0.5 - 1 part of methylhydrogenpolysiloxane, and 15 - 25 parts of matting powder.

[0009] A preparation method of the antibacterial silicone leather as described above includes the following steps:

[0010] Step S1: Weigh polysiloxane, fumed silica, platinum catalyst, methylhydrogenpolysiloxane, and matting powder. After mixing the above raw materials, we obtain the raw material for the silica gel surface layer. Mix and dilute the raw material for the silica gel surface layer and a diluent according to a mass ratio of 1:1. Coat the diluted mixture on a release paper to form a silica gel surface layer;

[0011] Step S2: Weigh methylvinylsiloxane, polymethylhydrosiloxane, platinum catalyst, phenyl silicone rubber, and fumed silica. After mixing the above raw materials, we obtain the raw material for the bonding layer; Mix and dilute the raw material for the bonding layer and a diluent according to a mass ratio of 1:1. Coat the diluted raw material for the bonding layer on the silica gel surface layer to form a bonding layer on the silica gel surface layer;

[0012] Step S3: Weigh honeysuckle, cedarwood oil, clove oil, aloe vera, nano-titanium dioxide, diatomite, and ethanol. Mix them evenly to make an antibacterial agent, and then spray it on the surface of the leather embryo. Cure and dry it to obtain a leather embryo sprayed with the antibacterial agent;

[0013] Step S4: Place the leather embryo sprayed with the antibacterial agent on the bonding layer with the silica gel surface layer, pre-cure it to a semi-cured state, use a hot roller to bond the leather embryo and the bonding layer, send it into an oven, and heat and cure it; After curing, wind it up and uncover the release paper at the same time to obtain a semi-finished antibacterial silica gel leather;

[0014] Step S5: Cure the semi-finished antibacterial silica gel leather at 120°C - 130°C to obtain the antibacterial silica gel leather.

[0015] As a further optimized solution of the present invention, the diluent is any one of octamethylcyclotetrasiloxane, silicone ether, and white spirit.

[0016] As a further optimized solution of the present invention, the thickness of the bonding layer is 200 - 300 μm.

[0017] As a further optimized solution of the present invention, in Step S4, the heating and curing temperature is 110 - 130°C, and the heating and curing time is 5 - 10 min.

[0018] As a further optimized solution of the present invention, in Step S4, the pre-curing temperature is 80 - 100°C, and the pre-curing time is 1 - 2 min.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, by adding nano-titanium dioxide into the antibacterial agent and mixing it with honeysuckle, cedarwood oil, clove oil, aloe vera, diatomite, and ethanol in the antibacterial agent, the nano-titanium dioxide can not only improve the odor removal ability of the leather but also increase the adhesion area of the antibacterial agent, thereby improving the antibacterial effect of the leather.

[0021] 2. In the present invention, by reasonably proportioning the Platycladus orientalis essential oil and the Syzygium aromaticum essential oil in the antibacterial agent and mixing them with aloe and honeysuckle in the antibacterial agent, not only the antibacterial performance of the silicone leather sprayed with the antibacterial agent is significantly improved, but also the yellowing resistance and wash resistance of the leather can be improved, and the service life of the silicone leather can be extended. Detailed implementation manners

[0022] The following further describes the present application in detail. It is necessary to point out here that the following specific implementation manners are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0023] 1. Preparation of antibacterial silicone leather

[0024] The raw material composition of the antibacterial silicone leather of the present invention is shown in the following table;

[0025]

[0026]

[0027] The specific preparation method of the antibacterial silicone leather includes the following steps:

[0028] Step S1: Weigh polysiloxane, fumed silica, platinum catalyst, methylhydrogenpolysiloxane, and matting powder. After mixing the above raw materials, the raw materials for the silicone surface layer are obtained. The raw materials for the silicone surface layer and the silicone ether are mixed and diluted according to a mass ratio of 1:1, and the diluted mixture is coated on the release paper to form a silicone surface layer;

[0029] Step S2: Weigh methylvinylsiloxane, polymethylhydrosiloxane, platinum catalyst, phenyl silicone rubber, and fumed silica. After mixing the above raw materials, the raw materials for the bonding layer are obtained; the raw materials for the bonding layer and the silicone ether are mixed and diluted according to a mass ratio of 1:1, and the diluted raw materials for the bonding layer are coated on the silicone surface layer to form a bonding layer with a thickness of 200 μm on the silicone surface layer;

[0030] Step S3: Weigh honeysuckle, Platycladus orientalis essential oil, Syzygium aromaticum essential oil, aloe, nano-titanium dioxide, diatomite, and ethanol, mix them evenly to make an antibacterial agent, and spray it on the surface of the leather embryo, and then cure and dry it to obtain a leather embryo sprayed with the antibacterial agent;

[0031] Step S4: Cover the leather embryo sprayed with the antibacterial agent on the bonding layer with a silica gel surface layer, and pre-cure it to a semi-cured state. The pre-curing temperature is 90°C, and the pre-curing time is 1 min. Use a hot roller to bond the leather embryo and the bonding layer, and then send it into an oven for heating and curing. After curing, wind it up while peeling off the release paper to obtain a semi-finished antibacterial silica gel leather. The heating and curing temperature is 120°C, and the heating and curing time is 5 min.

[0032] Step S6: Cure the semi-finished antibacterial silica gel leather at 120°C - 130°C to obtain the antibacterial silica gel leather.

[0033] 2. Preparation of Comparative Examples

[0034] Comparative Example 1

[0035] A preparation method of antibacterial silica gel leather, the only difference compared with Example 3 is that the clove essential oil in Step S1 is replaced with an equal amount of aloe vera.

[0036] Comparative Example 2

[0037] A preparation method of antibacterial silica gel leather, the only difference compared with Example 3 is that the nano-titanium dioxide in Step S1 is replaced with an equal amount of diatomite.

[0038] Comparative Example 3

[0039] A preparation method of antibacterial silica gel leather, the only difference compared with Example 3 is that the thuja essential oil in Step S1 is replaced with an equal amount of aloe vera.

[0040] Comparative Example 4

[0041] A preparation method of antibacterial silica gel leather, the only difference compared with Example 3 is that the step of pre-curing to a semi-cured state in Step S4 is omitted, where the pre-curing temperature is 90°C and the pre-curing time is 1 min, and the step of bonding the leather embryo and the bonding layer with a hot roller is not performed, and the leather is not pre-cured.

[0042] 3. Tests and Conclusions

[0043] The antibacterial silica gel leathers obtained by the preparation methods of Examples 1 - 3 and Comparative Examples 1 - 4 were respectively tested. (1) Use the XP-329IIIR odor detector to detect the odor adsorption property of the antibacterial silica gel leather; (2) Conduct antibacterial property tests on Examples 1 - 3 and Comparative Examples 1 - 4; (3) Refer to GB 4689—84 Leather Finished Product Physical and Chemical Performance Test Methods to test the tensile strength and tear strength. The results are as follows in the table:

[0044]

[0045] (4) The antibacterial silicone leather was respectively subjected to yellowing resistance detection. The 5-person rating method was adopted to subjectively rate the yellowing resistance of the fabric by touch. The lower the yellowing resistance level, the worse the yellowing resistance effect of the leather, and the higher the yellowing resistance level, the better the yellowing resistance effect of the leather; (5) The antibacterial silicone leather was respectively washed in an environment of 100 °C, and the number of times of washing resistance of the leather at 100 °C was detected. The results are as follows in the table:

[0046]

[0047]

[0048] Based on the above experimental data, the following conclusions are drawn:

[0049] It can be seen from Examples 1-3 and Comparative Examples 1-4 that the antibacterial rates of the antibacterial silicone leather in Examples 1-3 against Escherichia coli, Staphylococcus aureus, and Candida albicans all reached more than 90%. And the antibacterial rate of Example 3 against germs is the best. Comparing Example 3 with Comparative Example 1, the antibacterial rates in Comparative Example 1 are all about 30%, while the antibacterial rate in Comparative Example 3 is about 40%. Compared with Comparative Example 1 or Comparative Example 3, after reasonably mixing clove essential oil and Platycladus orientalis essential oil with nano-titanium dioxide and diatomite, a significant improvement in the antibacterial rate is achieved. And adding the mixture of clove essential oil and Platycladus orientalis essential oil to the antibacterial agent can improve the yellowing resistance and washing resistance of the silicone leather, thereby extending the service life of the leather; in addition, the antibacterial rate of Example 3 has a significant improvement compared with Comparative Example 2. It can be seen that the addition of nano-titanium dioxide in the antibacterial agent can not only improve the ability to remove the odor of the leather, but also increase the adhesion area, thus further improving the antibacterial effect of the leather; and the tensile strength and tear strength in Example 3 have a significant improvement compared with Comparative Example 4, thereby enhancing the service life of the silicone leather.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An antibacterial silicone leather, comprising a silicone surface layer, characterized in that: It also includes a bonding layer arranged on the silicone surface layer and a leather embryo covering the bonding layer and having an antibacterial agent sprayed on the surface; The antibacterial agent comprises the following raw materials in parts by mass: 35-50 parts of honeysuckle, 20-30 parts of arborvitae essential oil, 3-8 parts of clove essential oil, 2-7 parts of aloe vera, 20-30 parts of nano titanium dioxide, 25-35 parts of diatomaceous earth and 10-20 parts of ethanol; The bonding layer comprises the following raw materials in parts by mass: 55-65 parts of methyl vinyl siloxane, 0.5-1 parts of polymethyl hydrogen siloxane, 0.2-0.5 parts of platinum catalyst, 5-10 parts of phenyl silicone rubber and 25-45 parts of fumed silica; The silica gel surface layer comprises the following raw materials in parts by mass: 50-60 parts of polysiloxane, 25-35 parts of fumed silica, 0.02-0.2 parts of platinum catalyst, 0.5-1 parts of methyl hydrogen polysiloxane and 15-25 parts of matting powder; The preparation method of the antibacterial silicone leather comprises the following steps: Step S1, weighing polysiloxane, fumed silica, platinum catalyst, methyl hydrogen polysiloxane and matting powder, mixing the above raw materials to obtain a silicone surface layer raw material, mixing and diluting the silicone surface layer raw material and a diluent in a mass ratio of 1:1, and coating the diluted mixture on a release paper to form a silicone surface layer; Step S2, weighing methylvinylsiloxane, polymethylhydrogensiloxane, platinum catalyst, phenyl silicone rubber, and fumed silica, and mixing the above raw materials to obtain a bonding layer raw material; mixing and diluting the bonding layer raw material and a diluent in a mass ratio of 1:1, and coating the diluted bonding layer raw material on the silicone surface layer to form a bonding layer on the silicone surface layer; Step S3, weighing honeysuckle, arborvitae essential oil, clove essential oil, aloe, nano titanium dioxide, diatomaceous earth, and ethanol, mixing them evenly to prepare an antibacterial agent, and then spraying the mixture on the surface of the leather embryo, curing and drying the mixture, and obtaining a leather embryo sprayed with the antibacterial agent; Step S4, covering the leather embryo sprayed with the antibacterial agent on the adhesive layer with the silicone surface layer, pre-curing to a semi-cured state, using a hot roller to bond the leather embryo to the adhesive layer, and sending it into an oven for heating and curing; after the curing is completed, rolling up and peeling off the release paper, to obtain an antibacterial silicone leather semi-finished product; Step S5, secondary curing the antibacterial silicone leather semi-finished product at 120° C.-130° C. to obtain the antibacterial silicone leather.

2. The antibacterial silicone leather according to claim 1, characterized in that: The diluent is any one of octamethylcyclotetrasiloxane, silicone ether and white spirit.

3. The antibacterial silicone leather according to claim 1, characterized in that: The thickness of the bonding layer is 200-300 μm.

4. The antibacterial silicone leather according to claim 1, characterized in that: In the step S4, the heating curing temperature is 110-130° C., and the heating curing time is 5-10 minutes.

5. The antibacterial silicone leather according to claim 1, characterized in that: In step S4, the pre-curing temperature is 80-100° C., and the pre-curing time is 1-2 minutes.

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