Self-cleaning antibacterial roller rubber sealing element

Abstract

The invention discloses a self-cleaning antibacterial roller rubber sealing element and belongs to the technical field of rubber sealing elements, a tannic acid-zinc oxide / molybdenum disulfide nanometer material is added into raw materials of the self-cleaning antibacterial roller rubber sealing element, the self-cleaning antibacterial roller rubber sealing element is prepared through a hydrothermal synthesis method, zinc oxide is modified through tannic acid, and due to the synergistic effect of the tannic acid and the zinc oxide, the antibacterial performance can be improved. Molybdenum disulfide nanoflowers are used as a carrier to load modified zinc oxide, the dispersity of zinc oxide is improved, and molybdenum disulfide and carbon black in the raw materials interact to promote dispersion of carbon black. The roller rubber sealing element prepared by adding the tannic acid-zinc oxide / molybdenum disulfide nano material has excellent mechanical property, wear resistance, corrosion resistance and antibacterial property, and the surface of the sealing element can be kept clean.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber seals, and in particular relates to a self-cleaning antibacterial roller rubber seal. Background Art

[0002] As one of the common sealing materials in the industrial field, rubber seals play an important role in various application scenarios. Drum washing machines are one of the common household appliances in modern families. They have the advantages of high efficiency, energy saving, and high cleanliness. The rubber ring at the door of the drum washing machine is a part of the drum washing machine. It plays the role of fixing and sealing the drum, also known as a rubber seal. However, rubber seals will continue to accumulate foreign matter during the washing process, and they are in a humid environment for a long time, which is easy to breed bacteria. Most bacteria attach to clothes and come into contact with the human body, which will affect health.

[0003] At the same time, since most laundry detergents are alkaline and have certain corrosive properties, long-term contact between the drum rubber seal and the detergent will lead to performance degradation and damage due to corrosion, and the rubber ring needs to be replaced regularly. Summary of the invention

[0004] Based on the above problems, the object of the present invention is to provide a self-cleaning antibacterial roller rubber seal to improve the antibacterial performance of the roller rubber seal.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] The invention provides a self-cleaning antibacterial roller rubber seal, which comprises the following raw materials in parts by weight: 30-35 parts of ethylene propylene rubber, 2-2.5 parts of carbon black, 0.8-1.0 parts of accelerator, 15-20 parts of calcium carbonate, 2.5-3.0 parts of paraffin oil, 1.0-2.2 parts of tannic acid-zinc oxide / molybdenum disulfide nanomaterials, 3.0-3.5 parts of diphenyl guanidine, 2.0-2.2 parts of halide salt and 0.3-0.5 parts of polyphthalamide resin.

[0007] Furthermore, the accelerator is at least one of zinc diethyldithiocarbamate, zinc dibutyldithiocarbamate and zinc dimethyldithiocarbamate.

[0008] Furthermore, the preparation of the tannic acid-zinc oxide / molybdenum disulfide nanomaterial is as follows:

[0009] Zinc acetate and tannic acid were added to an ethanol solution and mixed for 10 minutes. Molybdenum disulfide nanoflowers and sodium hydroxide were then added and stirred to obtain a mixed solution. After stirring and reacting for 2 hours, the solution was placed in a microwave device for heating and then reacted at a constant temperature. Tannic acid-zinc oxide / molybdenum disulfide nanomaterials were obtained after filtering, washing and drying in sequence.

[0010] Zinc oxide loaded on molybdenum disulfide nanoflowers can form a heterojunction, which promotes the separation of photogenerated electron-hole pairs, degrades organic matter in detergents attached to the surface, and reduces bacterial growth.

[0011] Furthermore, the mass concentration of the ethanol solution is 80%.

[0012] Furthermore, the concentration of zinc acetate in the mixed solution is 0.02 mol / L.

[0013] Furthermore, the mass ratio of tannic acid to zinc acetate in the mixed solution is 1-5:100.

[0014] Furthermore, the mass ratio of molybdenum disulfide nanoflowers to zinc acetate in the mixed solution is 1:5-10.

[0015] Furthermore, sodium hydroxide is added to the mixed solution to adjust the pH value of the solution to 6.

[0016] Further, the heating temperature in the microwave device is 110°C;

[0017] The isothermal reaction time is 1 h.

[0018] Furthermore, the halide salt is zinc chloride.

[0019] Beneficial effects of the present invention:

[0020] (1) The present invention adds tannic acid-zinc oxide / molybdenum disulfide nanomaterials to the raw materials of the roller rubber seal. The nanomaterials are prepared by a hydrothermal method. Molybdenum disulfide nanoflowers are a layered structure material with a large specific surface area. The surface has abundant active sites and can be used as a carrier to combine with zinc oxide to reduce the agglomeration of zinc oxide. On the basis of using carbon black as a rubber filler, the carbon black aggregates are broken due to the coupling effect and electrostatic attraction between molybdenum disulfide and carbon black. The addition of molybdenum disulfide can improve the agglomeration performance of the filler, so that the obtained rubber material has better mechanical properties, wear resistance and corrosion resistance.

[0021] (2) The tannic acid-zinc oxide / molybdenum disulfide nanomaterial prepared by the present invention modifies zinc oxide with tannic acid as the main body, and the modification of the main body with tannic acid increases the antibacterial metal ion Zn + The release rate gives zinc oxide more excellent antibacterial properties and keeps the surface of the seal clean. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] Preparation of tannic acid-zinc oxide / molybdenum disulfide nanomaterials:

[0025] Zinc acetate and tannic acid are added to an 80wt% ethanol solution and mixed for 10 minutes, and then molybdenum disulfide nanoflowers are added, and then sodium hydroxide is added to adjust the pH of the solution to 6. After stirring, a mixed solution is obtained, in which the concentration of zinc acetate is 0.02mol / L, the mass ratio of tannic acid to zinc acetate is 1:100, and the mass ratio of molybdenum disulfide nanoflowers to zinc acetate is 1:10. After stirring and reacting for 2 hours, the mixture is placed in a microwave device and heated to 110°C and reacted at a constant temperature for 1 hour. After filtering, washing and drying in sequence, tannic acid-zinc oxide / molybdenum disulfide nanomaterials are obtained.

[0026] Preparation of the rubber drum seal:

[0027] The present embodiment provides a self-cleaning antibacterial roller rubber seal, which includes the following raw materials, by weight: 30 parts of ethylene propylene rubber, 2 parts of carbon black, 0.8 parts of zinc diethyl dithiocarbamate, 15 parts of calcium carbonate, 2.5 parts of paraffin oil, 1.0 parts of tannic acid-zinc oxide / molybdenum disulfide nanomaterial, 3.0 parts of diphenyl guanidine, 2.0 parts of zinc chloride and 0.3 parts of polyphthalamide resin.

[0028] The raw materials are mixed according to the above ratio, and are sequentially subjected to extrusion, vulcanization and molding processes to obtain a self-cleaning antibacterial roller rubber seal.

[0029] Example 2

[0030] The difference from Example 1 is that the weight proportion of tannic acid-zinc oxide / molybdenum disulfide nanomaterial in the raw material is adjusted to 1.8 parts, and the other steps are the same as Example 1.

[0031] Example 3

[0032] The difference from Example 1 is that the weight proportion of tannic acid-zinc oxide / molybdenum disulfide nanomaterial in the raw material is adjusted to 2.2 parts, and the other steps are the same as Example 1.

[0033] Example 4

[0034] The difference from Example 1 is that the mass ratio of tannic acid to zinc acetate is adjusted to 3:100 when preparing tannic acid-zinc oxide / molybdenum disulfide nanomaterials, and the other steps are the same as Example 1.

[0035] Example 5

[0036] The difference from Example 1 is that the mass ratio of tannic acid to zinc acetate is adjusted to 5:100 when preparing tannic acid-zinc oxide / molybdenum disulfide nanomaterials, and the other steps are the same as Example 1.

[0037] Example 6

[0038] The difference from Example 1 is that the mass ratio of molybdenum disulfide nanoflowers and zinc acetate is adjusted to 1:7 when preparing tannic acid-zinc oxide / molybdenum disulfide nanomaterials, and the other steps are the same as Example 1.

[0039] Example 7

[0040] The difference from Example 1 is that the mass ratio of molybdenum disulfide nanoflowers and zinc acetate is adjusted to 1:5 when preparing tannic acid-zinc oxide / molybdenum disulfide nanomaterials, and the other steps are the same as Example 1.

[0041] Embodiment 8-9

[0042] The difference from the first embodiment is that the raw material ratio of the self-cleaning antibacterial roller rubber seal is adjusted. The specific ratio is shown in Table 1.

[0043] Table 1

[0044]

[0045]

[0046] Comparative Example 1

[0047] The difference from Example 1 is that no tannic acid-zinc oxide / molybdenum disulfide nanomaterial is added to the raw materials of the roller rubber seal, and the other steps are the same as Example 1.

[0048] Comparative Example 2

[0049] The difference from Example 1 is that tannic acid is not added when preparing the tannic acid-zinc oxide / molybdenum disulfide nanomaterial, and the other steps are the same as Example 1.

[0050] Preparation of zinc oxide / molybdenum disulfide nanomaterials:

[0051] Zinc acetate was added to 80wt% ethanol solution and mixed for 10 minutes, and then molybdenum disulfide nanoflowers were added, and then sodium hydroxide was added to adjust the pH of the solution to 6. After stirring, a mixed solution was obtained, in which the concentration of zinc acetate was 0.02mol / L, and the mass ratio of molybdenum disulfide nanoflowers to zinc acetate was 1:10. After stirring and reacting for 2 hours, the mixture was placed in a microwave device and heated to 110°C and reacted at a constant temperature for 1 hour. After filtering, washing and drying in sequence, zinc oxide / molybdenum disulfide nanomaterials were obtained.

[0052] Preparation of the rubber drum seal:

[0053] The present embodiment provides a self-cleaning antibacterial roller rubber seal, which includes the following raw materials, by weight: 30 parts of ethylene propylene rubber, 2 parts of carbon black, 0.8 parts of zinc diethyl dithiocarbamate, 15 parts of calcium carbonate, 2.5 parts of paraffin oil, 1.0 parts of zinc oxide / molybdenum disulfide nanomaterial, 3.0 parts of diphenyl guanidine, 2.0 parts of zinc chloride and 0.3 parts of polyphthalamide resin.

[0054] The raw materials are mixed according to the above ratio, and are sequentially subjected to extrusion, vulcanization and molding processes to obtain a self-cleaning antibacterial roller rubber seal.

[0055] Comparative Example 3

[0056] The difference from Example 1 is that tannic acid and molybdenum disulfide are not added when preparing the tannic acid-zinc oxide / molybdenum disulfide nanomaterial, and the other steps are the same as Example 1.

[0057] Preparation of zinc oxide nanomaterials:

[0058] Zinc acetate was added to an 80wt% ethanol solution and mixed for 10 minutes, and then sodium hydroxide was added to adjust the pH of the solution to 6. After stirring, a mixed solution was obtained, in which the concentration of zinc acetate was 0.02 mol / L. After stirring and reacting for 2 hours, the solution was placed in a microwave device and heated to 110°C and reacted at a constant temperature for 1 hour. After filtering, washing and drying in sequence, zinc oxide nanomaterials were obtained.

[0059] Preparation of the rubber drum seal:

[0060] The present embodiment provides a self-cleaning antibacterial roller rubber seal, which includes the following raw materials, by weight: 30 parts of ethylene propylene rubber, 2 parts of carbon black, 0.8 parts of zinc diethyldithiocarbamate, 15 parts of calcium carbonate, 2.5 parts of paraffin oil, 1.0 parts of zinc oxide nanomaterial, 3.0 parts of diphenylguanidine, 2.0 parts of zinc chloride and 0.3 parts of polyphthalamide resin.

[0061] The raw materials are mixed according to the above ratio, and are sequentially subjected to extrusion, vulcanization and molding processes to obtain a self-cleaning antibacterial roller rubber seal.

[0062] Comparative Example 4

[0063] The difference from Example 1 is that when preparing the cylinder rubber seal, the tannic acid-zinc oxide / molybdenum disulfide nanomaterial is replaced by directly adding molybdenum disulfide nanoflowers, and the other steps are the same as Example 1.

[0064] Preparation of the barrel rubber seal:

[0065] The present embodiment provides a self-cleaning antibacterial roller rubber seal, which includes the following raw materials, by weight: 30 parts of ethylene propylene rubber, 2 parts of carbon black, 0.8 parts of zinc diethyldithiocarbamate, 15 parts of calcium carbonate, 2.5 parts of paraffin oil, 1.0 parts of molybdenum disulfide nanoflowers, 3.0 parts of diphenylguanidine, 2.0 parts of zinc chloride and 0.3 parts of polyphthalamide resin.

[0066] The raw materials are mixed according to the above ratio, and are sequentially subjected to extrusion, vulcanization and molding processes to obtain a self-cleaning antibacterial roller rubber seal.

[0067] Performance tests were performed on Examples 1 to 9 and Comparative Examples 1 to 4, and the results are shown in Table 2.

[0068] Tensile strength: The tensile strength is measured in accordance with GB / T 528-2009 “Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber”.

[0069] Wear resistance: Use a wear tester to test the unit wear amount.

[0070] Antibacterial performance: Escherichia coli was used as the bacteria, and the antibacterial rate was obtained by antibacterial testing using the film method in GB21551.2-2010 “Particular requirements for antibacterial materials with antibacterial, sterilization and purification functions for household and similar electrical appliances”.

[0071] Corrosion resistance: Refer to GB / T 1690-2010 "Test method for liquid resistance of vulcanized rubber or thermoplastic rubber" for testing. The immersion liquid is 20wt% sodium hydroxide solution. The tensile strength is tested after immersion for 24 hours.

[0072] Table 2

[0073]

[0074] As can be seen from Table 1, increasing the dosage of tannic acid-zinc oxide / molybdenum disulfide nanomaterials in the raw materials can improve the tensile strength and wear resistance of the drum rubber seal, but too much dosage will cause self-polymerization, resulting in poor dispersibility and poor mechanical properties of the rubber. In combination with Examples 4 and 5, it can be seen that the increase in the proportion of tannic acid in tannic acid-zinc oxide / molybdenum disulfide nanomaterials can improve the antibacterial properties of the material. The increase in the proportion of molybdenum disulfide nanoflowers in Examples 6 and 7 can promote the dispersion of carbon black and zinc oxide, improve mechanical properties and corrosion resistance, and on the other hand, based on the layered structure of molybdenum disulfide itself, improve wear resistance. On the basis of Example 1, combined with the results of Comparative Examples 1-4, it can be seen that tannic acid, zinc oxide and molybdenum disulfide are combined to enable the nanomaterial to give the seal excellent mechanical properties, wear resistance, antibacterial properties and corrosion resistance.

[0075] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0076] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-cleaning antibacterial roller rubber seal, characterized in that: The raw materials are as follows, measured by weight: 30-35 parts of EPDM rubber, 2-2.5 parts of carbon black, 0.8-1.0 parts of accelerator, 15-20 parts of calcium carbonate, 2.5-3.0 parts of paraffin oil, 1.0-2.2 parts of tannic acid-zinc oxide / molybdenum disulfide nanomaterials, 3.0-3.5 parts of diphenylguanidine, 2.0-2.2 parts of halide salt and 0.3-0.5 parts of polyphthalamide resin.

2. A self-cleaning antibacterial roller rubber seal according to claim 1, characterized in that: The accelerator is at least one of zinc diethyldithiocarbamate, zinc dibutyldithiocarbamate and zinc dimethyldithiocarbamate.

3. The self-cleaning antibacterial roller rubber seal according to claim 1, characterized in that: The preparation of the tannic acid-zinc oxide / molybdenum disulfide nanomaterial is as follows: Zinc acetate and tannic acid were added to an ethanol solution and mixed for 10 minutes. Molybdenum disulfide nanoflowers and sodium hydroxide were then added and stirred to obtain a mixed solution. After stirring and reacting for 2 hours, the solution was placed in a microwave device for heating and then reacted at a constant temperature. Tannic acid-zinc oxide / molybdenum disulfide nanomaterials were obtained after filtering, washing and drying in sequence.

4. A self-cleaning antibacterial roller rubber seal according to claim 3, characterized in that: The mass concentration of the ethanol solution is 80%.

5. The self-cleaning antibacterial roller rubber seal according to claim 3, characterized in that: The concentration of zinc acetate in the mixed solution is 0.02 mol / L.

6. The self-cleaning antibacterial roller rubber seal according to claim 3, characterized in that: The mass ratio of tannic acid to zinc acetate in the mixed solution is 1-5:

100.

7. The self-cleaning antibacterial roller rubber seal according to claim 3, characterized in that: The mass ratio of molybdenum disulfide nanoflowers to zinc acetate in the mixed solution is 1:5-10.

8. The self-cleaning antibacterial roller rubber seal according to claim 3, characterized in that: Sodium hydroxide was added into the mixed solution to adjust the pH value of the solution to 6.

9. The self-cleaning antibacterial roller rubber seal according to claim 3, characterized in that: The heating temperature in the microwave equipment is 110°C; The isothermal reaction time is 1 h.

10. The self-cleaning antibacterial roller rubber seal according to claim 1, characterized in that: The halide salt is zinc chloride.

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