High temperature resistant metal encapsulated elastomer and method of making same

Abstract

The present application relates to the technical field of elastomer, in particular to a high-temperature-resistant elastomer for metal encapsulation and a preparation method thereof; the present application prepares a high-temperature-resistant elastomer for metal encapsulation, which can be applied to utensils such as frying pan spatula, rice spoon and the like that need high-frequency contact with high-temperature heating, oil stains and water washing, and considering that part of the users also have the habit of high-temperature disinfection, the present application also improves the high-temperature resistance of the encapsulation material, so that it can withstand long-time boiling water high-temperature heating without deformation shrinkage and the like defects, and on this basis, the present application also carries out antibacterial modification treatment on the encapsulation elastomer, so that it has the antibacterial property against common pathogenic bacteria such as escherichia coli and staphylococcus aureus, which not only prolongs the service life of the kitchen utensils, but also guarantees food hygiene.

Description

Technical Field

[0001] This invention relates to the field of coating materials technology, specifically a high-temperature resistant metal coating elastomer and its preparation method. Background Technology

[0002] Metal coating is a packaging method that involves covering the surface of a metal substrate with a layer of polymer material. Its purpose is to give the metal properties such as anti-slip, heat insulation, and even insulation and weather resistance, thereby improving the practical performance of the product and enhancing the user experience. Therefore, it is often used in various household utensils, such as spoons and spatulas, which are utensils that come into frequent contact with high temperatures and oily environments. Coating them can significantly improve the user experience. Summary of the Invention

[0003] The purpose of this invention is to provide a high-temperature resistant metal-coated elastomer and its preparation method, so as to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-temperature resistant elastomer for metal coating, having the following technical features: by weight fraction, the high-temperature resistant elastomer for metal coating is composed of 40-70 parts of component A, 18-22 parts of component B, and 10-40 parts of component C; Component A comprises the following components: 80 parts LLDPE resin, 20 parts EBA resin, 8-15 parts antibacterial and heat-resistant olefin monomer, 1-2 parts maleic anhydride, and 1-1.2 parts dicumyl peroxide; Component B comprises the following components: 100 parts POE resin, 1-2 parts maleic anhydride, and 0.5-1 part dicumyl peroxide; Component C comprises the following components: 100 parts SEBS, 1-2 parts maleic anhydride, and 0.5-1 parts dicumyl peroxide.

[0005] Furthermore, the EBA has a melt index of 150-200 g / 10 min and an ester content of 26-30%.

[0006] Furthermore, the POE resin is type 65056 POE resin; the SEBS resin used is either type 6153 SEBS resin or type 6151 SEBS resin.

[0007] Furthermore, the preparation method of the antibacterial and heat-resistant olefin monomer includes the following steps: a. Under a nitrogen atmosphere, tetramethyldivinyldisiloxane was dispersed in toluene, stirred and mixed evenly, heated to 105-110°C to remove moisture, then cooled to room temperature, dibutyltin dilaurate was added and mixed evenly, then added dropwise to diethanolamine, heated to 38-45°C, stirred and reacted for 4-8 hours, and then the excess solvent was removed by rotary evaporation to obtain the silanol intermediate; b. Under nitrogen atmosphere protection, the silanol intermediate is dispersed in DMF and stirred until homogeneous. Then, a DMF solution containing 4-carboxybenzenesulfonyl azide is added dropwise. The temperature is raised to 35-45°C and the reaction is stirred for 6-12 hours. After cooling to room temperature, acetone aldehyde-1-oxime and trifluoroacetic acid are added. The reaction is stirred for another 12-24 hours. After vacuum drying to constant weight, the dried product is washed with saturated sodium bicarbonate solution and dried to constant weight to obtain the antibacterial modified intermediate. c. The antibacterial modified monomer is redispersed in DMF, allylamine and acetic acid are added, the temperature is raised to 45~60℃, and the reaction is stirred for 6~8h. After removing most of the solvent by rotary evaporation, the antibacterial and heat-resistant olefin monomer is obtained.

[0008] Furthermore, in step a, the amounts of each component added, by weight, are 10 parts tetramethyldivinyldisiloxane, 0.05 to 0.1 parts dibutyltin dilaurate, and 11 to 11.5 parts diethanolamine.

[0009] Furthermore, in step b, the amounts of each component added, by weight, are 10 parts of silanol intermediate, 22-24 parts of 4-carboxybenzenesulfonate, 9.2-9.5 parts of acetone aldehyde-1-oxime, and 0.3-0.5 parts of trifluoroacetic acid.

[0010] Furthermore, in step c, the amount of each component added, by weight, is 10 parts of antibacterial modified monomer, 1.2 to 1.4 parts of allylamine and 0.08 to 0.1 parts of acetic acid.

[0011] Furthermore, a method for preparing a high-temperature resistant metal-coated elastomer includes the following steps: S1. Mix LLDPE resin, EBA resin, antibacterial and heat-resistant olefin monomer, maleic anhydride, and dicumyl peroxide, place them in a twin-screw extruder, heat to 180~200℃, mix and extrude granulate to obtain component A; S2. Mix POE resin, maleic anhydride, and dicumyl peroxide, place them in a twin-screw extruder, heat to 180~200℃, mix and extrude granules to obtain component B; S3. Mix SEBS, maleic anhydride, and dicumyl peroxide, heat to 180~200℃, mix and extrude granulation to obtain component C; S4. Mix components A, B, and C in a certain proportion, heat to 190~210℃, and extrude to obtain a high-temperature resistant metal-coated elastomer.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are: This invention prepares a metal-coated elastomer that can be used in kitchen spatulas and other applications, and endows it with high temperature resistance and antibacterial properties, so that it can fully cope with multiple high-temperature heating and oily environments during kitchen processing. This invention first uses tetramethyldivinyldisiloxane containing silicon-oxygen bonds as a raw material. The silicon-oxygen bonds contained therein have high bond energy. Introducing them into the crosslinking network of the overcoated elastomer can effectively improve the temperature resistance of the overcoated elastomer. Furthermore, the -Si-O-Si- in it also has unique flexibility. The 3d empty orbitals of silicon can form weak coordination bonds with the lone pair electrons of oxygen atoms, thereby giving the silicon-oxygen bonds a certain degree of rotational freedom. This further enhances the stability of the crosslinking network at high temperatures and avoids deformation caused by the breakage of crosslinking segments. Based on this, the present invention uses diethanolamine and tetramethyldivinyldisiloxane to react the olefin double bond in tetramethyldivinyldisiloxane with the amino group in diethanolamine, thereby generating a silanol intermediate containing free hydroxyl groups. This intermediate is then mixed with 4-carboxybenzenesulfonate, and the azide group is introduced into the reaction through esterification between the carboxyl and hydroxyl groups. Further, it is mixed with acetone aldehyde-1-oxime and trifluoroacetic acid. Under these reaction conditions, the azide group undergoes a cycloaddition reaction with the C=N bond, followed by ring-opening under the catalysis of trifluoroacetic acid, releasing nitrogen gas. This produces a guanidine-derived structure with antibacterial activity while retaining the ketone carbonyl group in acetone aldehyde-1-oxime. The guanidine group can effectively disrupt the cell membrane of microorganisms and interfere with their enzyme activity and nucleic acid replication, thereby inhibiting the proliferation of pathogenic bacteria and achieving the antibacterial purpose. Furthermore, this invention further utilizes the reaction between allylamine and antibacterial modification intermediates, taking advantage of the reaction between amino and ketone carbonyl groups to further introduce allyl groups with cross-linking activity into the reaction product. Subsequently, under the action of dicumyl peroxide, the allyl groups will cross-link with the double bonds in LLDPE, thereby introducing silicon-oxygen bonds and guanidine structures into the cross-linked resin, thus effectively improving the high-temperature resistance of the coating material. Furthermore, taking into account the different environments that different appliances need to cope with, the present invention also prepared metal-coated elastomers with different hardness by changing the amount of components A, B, and C added, so that they can meet different product requirements. Detailed Implementation

[0013] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] The LLDPE used in this application is LL 1002KW type LLDPE resin, the EBA resin is 28BA175 type EBA resin, the POE resin is 65056 type POE resin, and the SEBS is 6453 type SEBS resin.

[0015] Example 1. A method for preparing a high-temperature resistant elastomer for metal coating, comprising the following steps: S1. By weight, 80 parts LLDPE resin, 20 parts EBA resin, 8 parts antibacterial heat-resistant olefin monomer, 1 part maleic anhydride, and 1 part dicumyl peroxide are mixed and placed in a twin-screw extruder, heated to 180°C, mixed and extruded into granules to obtain component A. The method for preparing the antibacterial and heat-resistant olefin monomer includes the following steps: a. Under a nitrogen atmosphere, 10 parts by weight of tetramethyldivinyldisiloxane were dispersed in toluene, stirred and mixed evenly, heated to 105°C to remove moisture, cooled to room temperature, and 0.05 parts of dibutyltin dilaurate were added and mixed evenly. The mixture was then added dropwise to 11 parts of diethanolamine, heated to 40°C, stirred and reacted for 8 hours, and the excess solvent was removed by rotary evaporation to obtain the silanol intermediate. b. Under a nitrogen atmosphere, disperse 10 parts by weight of the silanol intermediate in DMF and stir until homogeneous. Then, add dropwise a DMF solution containing 22 parts of 4-carboxybenzenesulfonyl azide. Heat to 35°C and stir for 12 hours. Cool to room temperature and add 9.2 parts of acetone aldehyde-1-oxime and 0.3 parts of trifluoroacetic acid. Continue stirring for 24 hours. After vacuum drying to constant weight, wash the dried product with saturated sodium bicarbonate solution and dry to constant weight to obtain the antibacterial modified intermediate. c. By weight, 10 parts of the antibacterial modified monomer were redispersed in DMF, 1.2 parts of allylamine and 0.1 parts of acetic acid were added, the temperature was raised to 45°C, and the mixture was stirred and reacted for 8 hours. After removing most of the solvent by rotary evaporation, the antibacterial heat-resistant olefin monomer was obtained. S2. By weight, 100 parts of POE resin, 1 part of maleic anhydride, and 0.5 parts of dicumyl peroxide are mixed, placed in a twin-screw extruder, heated to 180°C, mixed, and extruded into granules to obtain component B; S3. By weight, mix 100 parts SEBS, 1 part maleic anhydride and 0.5 parts dicumyl peroxide, heat to 180°C, mix and extrude granulate to obtain component C; S4. By weight, mix 40 parts of component A, 20 parts of component B, and 40 parts of component C, heat to 210°C, and extrude to obtain a high-temperature resistant metal-coated elastomer.

[0016] Example 2. A method for preparing a high-temperature resistant elastomer for metal coating, comprising the following steps: Compared with Example 1, this example changes the amount of dicumyl peroxide added in steps S1 to S3, while the other steps remain unchanged; S1. By weight, 80 parts of LLDPE resin, 20 parts of EBA resin, 8 parts of antibacterial and heat-resistant olefin monomer, 1 part of maleic anhydride, and 1.2 parts of dicumyl peroxide are mixed and placed in a twin-screw extruder, heated to 180°C, mixed and extruded into granules to obtain component A. S2. By weight, 100 parts of POE resin, 1 part of maleic anhydride, and 1 part of dicumyl peroxide are mixed, placed in a twin-screw extruder, heated to 180°C, mixed, and extruded into granules to obtain component B. S3. By weight, 100 parts of SEBS, 1 part of maleic anhydride, and 1 part of dicumyl peroxide are mixed, heated to 180°C, mixed, and extruded into granules to obtain component C; S4. By weight, mix 40 parts of component A, 20 parts of component B, and 40 parts of component C, heat to 210°C, and extrude to obtain a high-temperature resistant metal-coated elastomer.

[0017] Example 3. A method for preparing a high-temperature resistant elastomer for metal coating, comprising the following steps: Compared with Example 2, this example changes the amount of maleic anhydride added in steps S1 to S3, while the other steps remain unchanged; S1. By weight, 80 parts of LLDPE resin, 20 parts of EBA resin, 8 parts of antibacterial and heat-resistant olefin monomer, 2 parts of maleic anhydride, and 1.2 parts of dicumyl peroxide are mixed and placed in a twin-screw extruder, heated to 180°C, mixed and extruded into granules to obtain component A. S2. By weight, 100 parts of POE resin, 2 parts of maleic anhydride, and 1 part of dicumyl peroxide are mixed, placed in a twin-screw extruder, heated to 180°C, mixed, and extruded into granules to obtain component B; S3. By weight, 100 parts of SEBS, 2 parts of maleic anhydride, and 1 part of dicumyl peroxide are mixed, heated to 180°C, mixed, and extruded into granules to obtain component C; S4. By weight, mix 40 parts of component A, 20 parts of component B, and 40 parts of component C, heat to 210°C, and extrude to obtain a high-temperature resistant metal-coated elastomer.

[0018] Example 4. A method for preparing a high-temperature resistant elastomer for metal coating, comprising the following steps: Compared with Example 3, this example changes the amount of each component added in step S4, while the other steps remain unchanged; S1. By weight, 80 parts of LLDPE resin, 20 parts of EBA resin, 8 parts of antibacterial and heat-resistant olefin monomer, 2 parts of maleic anhydride, and 1.2 parts of dicumyl peroxide are mixed and placed in a twin-screw extruder, heated to 180°C, mixed and extruded into granules to obtain component A. S2. By weight, 100 parts of POE resin, 2 parts of maleic anhydride, and 1 part of dicumyl peroxide are mixed, placed in a twin-screw extruder, heated to 180°C, mixed, and extruded into granules to obtain component B; S3. By weight, 100 parts of SEBS, 2 parts of maleic anhydride, and 1 part of dicumyl peroxide are mixed, heated to 180°C, mixed, and extruded into granules to obtain component C; S4. By weight, mix 60 parts of component A, 20 parts of component B, and 20 parts of component C, heat to 210°C, and extrude to obtain a high-temperature resistant metal-coated elastomer.

[0019] Example 5. A method for preparing a high-temperature resistant elastomer for metal coating, comprising the following steps: Compared with Example 3, this example changes the amount of each component added in step S4, while the other steps remain unchanged; S1. By weight, 80 parts of LLDPE resin, 20 parts of EBA resin, 8 parts of antibacterial and heat-resistant olefin monomer, 2 parts of maleic anhydride, and 1.2 parts of dicumyl peroxide are mixed and placed in a twin-screw extruder, heated to 180°C, mixed and extruded into granules to obtain component A. S2. By weight, 100 parts of POE resin, 2 parts of maleic anhydride, and 1 part of dicumyl peroxide are mixed, placed in a twin-screw extruder, heated to 180°C, mixed, and extruded into granules to obtain component B; S3. By weight, 100 parts of SEBS, 2 parts of maleic anhydride, and 1 part of dicumyl peroxide are mixed, heated to 180°C, mixed, and extruded into granules to obtain component C; S4. By weight, mix 70 parts of component A, 20 parts of component B, and 10 parts of component C, heat to 210°C, and extrude to obtain a high-temperature resistant metal-coated elastomer.

[0020] Example 6. A method for preparing a high-temperature resistant elastomer for metal coating, comprising the following steps: Compared with Example 5, this example changes the amount of antibacterial and heat-resistant olefin monomer added in step S1, while the other steps remain unchanged; S1. By weight, 80 parts LLDPE resin, 20 parts EBA resin, 15 parts antibacterial heat-resistant olefin monomer, 2 parts maleic anhydride, and 1.2 parts dicumyl peroxide are mixed and placed in a twin-screw extruder, heated to 180°C, mixed and extruded into granules to obtain component A. S2. By weight, 100 parts of POE resin, 2 parts of maleic anhydride, and 1 part of dicumyl peroxide are mixed, placed in a twin-screw extruder, heated to 180°C, mixed, and extruded into granules to obtain component B; S3. By weight, 100 parts of SEBS, 2 parts of maleic anhydride, and 1 part of dicumyl peroxide are mixed, heated to 180°C, mixed, and extruded into granules to obtain component C; S4. By weight, mix 70 parts of component A, 20 parts of component B, and 10 parts of component C, heat to 210°C, and extrude to obtain a high-temperature resistant metal-coated elastomer.

[0021] Example 7. A method for preparing a high-temperature resistant elastomer for metal coating, comprising the following steps: Compared with Example 6, this example changes the amount of diethanolamine added in step a, while the other steps remain unchanged; The method for preparing the antibacterial and heat-resistant olefin monomer includes the following steps: a. Under a nitrogen atmosphere, 10 parts by weight of tetramethyldivinyldisiloxane were dispersed in toluene, stirred and mixed evenly, heated to 105°C to remove moisture, cooled to room temperature, and 0.05 parts of dibutyltin dilaurate were added and mixed evenly. This mixture was then added dropwise to 11.5 parts of diethanolamine, heated to 40°C, stirred and reacted for 8 hours, and the excess solvent was removed by rotary evaporation to obtain the silanol intermediate. b. Under a nitrogen atmosphere, disperse 10 parts by weight of the silanol intermediate in DMF and stir until homogeneous. Then, add dropwise a DMF solution containing 22 parts of 4-carboxybenzenesulfonyl azide. Heat to 35°C and stir for 12 hours. Cool to room temperature and add 9.2 parts of acetone aldehyde-1-oxime and 0.3 parts of trifluoroacetic acid. Continue stirring for 24 hours. After vacuum drying to constant weight, wash the dried product with saturated sodium bicarbonate solution and dry to constant weight to obtain the antibacterial modified intermediate. c. By weight, 10 parts of the antibacterial modified monomer were redispersed in DMF, and 1.2 parts of allylamine and 0.1 parts of acetic acid were added. The mixture was heated to 45°C and stirred for 8 hours. After removing most of the solvent by rotary evaporation, the antibacterial and heat-resistant olefin monomer was obtained.

[0022] Example 8. A method for preparing a high-temperature resistant elastomer for metal coating, comprising the following steps: Compared with Example 7, this example changed the amount of 4-carboxybenzenesulfonate and acetone aldehyde-1-oxime added in step b, while the other steps remained unchanged; The method for preparing the antibacterial and heat-resistant olefin monomer includes the following steps: a. Under a nitrogen atmosphere, 10 parts by weight of tetramethyldivinyldisiloxane were dispersed in toluene, stirred and mixed evenly, heated to 105°C to remove moisture, cooled to room temperature, and 0.05 parts of dibutyltin dilaurate were added and mixed evenly. This mixture was then added dropwise to 11.5 parts of diethanolamine, heated to 40°C, stirred and reacted for 8 hours, and the excess solvent was removed by rotary evaporation to obtain the silanol intermediate. b. Under a nitrogen atmosphere, disperse 10 parts by weight of the silanol intermediate in DMF and stir until homogeneous. Then, add dropwise a DMF solution containing 24 parts of 4-carboxybenzenesulfonyl azide. Heat to 35°C and stir for 12 hours. Cool to room temperature and add 9.5 parts of acetone aldehyde-1-oxime and 0.3 parts of trifluoroacetic acid. Continue stirring for 24 hours. Vacuum dry to constant weight, wash the dried product with saturated sodium bicarbonate solution, and dry to constant weight to obtain the antibacterial modified intermediate. c. By weight, 10 parts of the antibacterial modified monomer were redispersed in DMF, and 1.2 parts of allylamine and 0.1 parts of acetic acid were added. The mixture was heated to 45°C and stirred for 8 hours. After removing most of the solvent by rotary evaporation, the antibacterial and heat-resistant olefin monomer was obtained.

[0023] Example 9. A method for preparing a high-temperature resistant elastomer for metal coating, comprising the following steps: Compared with Example 8, this example changed the amount of allylamine added in step c, while the other steps remained unchanged; The method for preparing the antibacterial and heat-resistant olefin monomer includes the following steps: a. Under a nitrogen atmosphere, 10 parts by weight of tetramethyldivinyldisiloxane were dispersed in toluene, stirred and mixed evenly, heated to 105°C to remove moisture, cooled to room temperature, and 0.05 parts of dibutyltin dilaurate were added and mixed evenly. This mixture was then added dropwise to 11.5 parts of diethanolamine, heated to 40°C, stirred and reacted for 8 hours, and the excess solvent was removed by rotary evaporation to obtain the silanol intermediate. b. Under a nitrogen atmosphere, disperse 10 parts by weight of the silanol intermediate in DMF and stir until homogeneous. Then, add dropwise a DMF solution containing 24 parts of 4-carboxybenzenesulfonyl azide. Heat to 35°C and stir for 12 hours. Cool to room temperature and add 9.5 parts of acetone aldehyde-1-oxime and 0.3 parts of trifluoroacetic acid. Continue stirring for 24 hours. Vacuum dry to constant weight, wash the dried product with saturated sodium bicarbonate solution, and dry to constant weight to obtain the antibacterial modified intermediate. c. By weight, 10 parts of the antibacterial modified monomer were redispersed in DMF, and 1.4 parts of allylamine and 0.1 parts of acetic acid were added. The mixture was heated to 45°C and stirred for 8 hours. After removing most of the solvent by rotary evaporation, the antibacterial and heat-resistant olefin monomer was obtained.

[0024] Comparative Example 1. A method for preparing a high-temperature resistant elastomer for metal coating, comprising the following steps: Compared with Example 6, no antibacterial and heat-resistant olefin monomer was added in step S1 of this comparative example, and the other steps remained unchanged; S1. By weight, 80 parts of LLDPE resin, 20 parts of EBA resin, 2 parts of maleic anhydride, and 1.2 parts of dicumyl peroxide are mixed, placed in a twin-screw extruder, heated to 180°C, mixed, and extruded into granules to obtain component A. S2. By weight, 100 parts of POE resin, 2 parts of maleic anhydride, and 1 part of dicumyl peroxide are mixed, placed in a twin-screw extruder, heated to 180°C, mixed, and extruded into granules to obtain component B; S3. By weight, 100 parts of SEBS, 2 parts of maleic anhydride, and 1 part of dicumyl peroxide are mixed, heated to 180°C, mixed, and extruded into granules to obtain component C; S4. By weight, mix 70 parts of component A, 20 parts of component B, and 10 parts of component C, heat to 210°C, and extrude to obtain a high-temperature resistant metal-coated elastomer.

[0025] Detection: The high-temperature resistant metal coating elastomers prepared in Examples 1-9 and Comparative Example 1 were used to coat metal parts. During the coating process, the metal parts were heated to 100°C and then placed in a mold. After the mold was heated to 40°C, the high-temperature resistant metal coating elastomer was added and the temperature was increased to 220°C. The elastomer was then extruded into the mold for injection molding. After holding the pressure at 3MPa for 15s, the mold was opened to obtain the coating test sample. The adhesive strength and hardness of the overmolded test samples prepared in Examples 1-9 and Comparative Example 1 were tested. The bonding strength test method refers to GB / T 7760-2003 "Determination of bonding strength between vulcanized rubber or thermoplastic rubber and rigid sheet material - 90° peel method"; Hardness was tested using a Shore hardness tester. The temperature resistance of the overmolded test samples prepared in Examples 1-9 and Comparative Example 1 was tested. They were placed in boiling water at 100°C and steam at 120°C for 1 hour each, and the deformation of the overmolded plastic was tested. The antibacterial properties of the high-temperature resistant metal-coated elastomers prepared in Examples 1-9 and Comparative Example 1 were tested according to GB / T 31402-2015 "Test Method for Antibacterial Properties of Plastic Surfaces". The tested bacteria were Escherichia coli and Staphylococcus aureus, respectively. The tensile strength and elongation at break of the high-temperature resistant metal-coated elastomers prepared in Examples 1-9 and Comparative Example 1 were tested according to ASTM D638-14.

[0026] As can be seen from Examples 1-3 in the table above, as the amount of dicumyl peroxide and maleic anhydride increases, the number of active sites in the crosslinking process increases, thereby improving the strength and hardness of the metal-coated elastomer. As can be seen from the comparison of Examples 3 to 5 of this application, by changing the amount of components A, B and C added, the hardness of the elastomer for metal coating can be significantly changed, thereby enabling it to meet the needs of different products. As can be seen from Examples 6-9 and Comparative Example 1 of this application, with the addition of antibacterial and heat-resistant olefin monomers, the antibacterial rate of the product against Escherichia coli and Staphylococcus aureus has been significantly improved. Furthermore, the addition of antibacterial and heat-resistant olefin monomers effectively improves the complexity of the crosslinking network of the elastomer, thus effectively improving the tensile strength of the elastomer. Moreover, with the increase of the content of each component in the reaction process of synthesizing antibacterial and heat-resistant olefin monomers, the number of guanidine groups and olefin double bonds increases, thereby further improving the antibacterial properties and strength of the coated elastomer.

[0027] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-temperature resistant elastomer for metal coating, characterized in that: By weight fraction, the high-temperature resistant metal-coated elastomer is composed of 40-70 parts of component A, 18-22 parts of component B, and 10-40 parts of component C; Component A comprises the following components: 80 parts LLDPE resin, 20 parts EBA resin, 8-15 parts antibacterial and heat-resistant olefin monomer, 1-2 parts maleic anhydride, and 1-1.2 parts dicumyl peroxide; Component B comprises the following components: 100 parts POE resin, 1-2 parts maleic anhydride, and 0.5-1 part dicumyl peroxide; Component C comprises the following components: 100 parts SEBS, 1-2 parts maleic anhydride, and 0.5-1 parts dicumyl peroxide.

2. The high-temperature resistant elastomer for metal coating according to claim 1, characterized in that: The EBA has a melt index of 150-200 g / 10 min and an ester content of 26-30%.

3. The high-temperature resistant elastomer for metal coating according to claim 1, characterized in that: The POE resin is type 65056 POE resin; the SEBS resin used is either type 6153 SEBS resin or type 6151 SEBS resin.

4. The high-temperature resistant elastomer for metal coating according to claim 1, characterized in that: The preparation method of the antibacterial and heat-resistant olefin monomer includes the following steps: a. Under a nitrogen atmosphere, tetramethyldivinyldisiloxane was dispersed in toluene, stirred and mixed evenly, heated to 105-110°C to remove moisture, then cooled to room temperature, dibutyltin dilaurate was added and mixed evenly, then added dropwise to diethanolamine, heated to 38-45°C, stirred and reacted for 4-8 hours, and then the excess solvent was removed by rotary evaporation to obtain the silanol intermediate; b. Under nitrogen atmosphere protection, the silanol intermediate is dispersed in DMF and stirred until homogeneous. Then, a DMF solution containing 4-carboxybenzenesulfonyl azide is added dropwise. The temperature is raised to 35-45°C and the reaction is stirred for 6-12 hours. After cooling to room temperature, acetone aldehyde-1-oxime and trifluoroacetic acid are added. The reaction is stirred for another 12-24 hours. After vacuum drying to constant weight, the dried product is washed with saturated sodium bicarbonate solution and dried to constant weight to obtain the antibacterial modified intermediate. c. The antibacterial modified monomer is redispersed in DMF, allylamine and acetic acid are added, the temperature is raised to 45~60℃, and the reaction is stirred for 6~8h. After removing most of the solvent by rotary evaporation, the antibacterial and heat-resistant olefin monomer is obtained.

5. The high-temperature resistant elastomer for metal coating according to claim 4, characterized in that: In step a, the amounts of each component added, by weight, are 10 parts tetramethyldivinyldisiloxane (186), 0.05 to 0.1 parts dibutyltin dilaurate, and 11 to 11.5 parts diethanolamine (105).

6. The high-temperature resistant elastomer for metal coating according to claim 4, characterized in that: In step b, the amount of each component added by weight is 10 parts of silanol intermediate (380), 22-24 parts of 4-carboxybenzenesulfonate (227), 9.2-9.5 parts of acetone aldehyde-1-oxime (87) and 0.3-0.5 parts of trifluoroacetic acid (114).

7. The high-temperature resistant elastomer for metal coating according to claim 4, characterized in that: In step c, the amount of each component added by weight is 10 parts of antibacterial modified monomer (1500), 1.2~1.4 parts of allylamine (57) and 0.08~0.1 parts of acetic acid.

8. A method for preparing a high-temperature resistant metal-coated elastomer as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Mix LLDPE resin, EBA resin, antibacterial and heat-resistant olefin monomer, maleic anhydride, and dicumyl peroxide, place them in a twin-screw extruder, heat to 180~200℃, mix and extrude granulate to obtain component A; S2. Mix POE resin, maleic anhydride, and dicumyl peroxide, place them in a twin-screw extruder, heat to 180~200℃, mix and extrude granules to obtain component B; S3. Mix SEBS, maleic anhydride, and dicumyl peroxide, heat to 180~200℃, mix and extrude granulation to obtain component C; S4. Mix components A, B, and C in a certain proportion, heat to 190~210℃, and extrude to obtain a high-temperature resistant metal-coated elastomer.

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