阅读说明：本技术 一种彩色橡胶制品及其制作工艺 (Colored rubber product and manufacturing process thereof ) 是由 阙志刚 吴星 于 2021-09-06 设计创作，主要内容包括：本发明公开了一种彩色橡胶制品及其制作工艺,涉及橡胶制品技术领域。该彩色橡胶制品由经过壳聚糖/锌混合抗菌剂、气相二氧化硅混炼改性的抗菌改性甲基乙烯基硅橡胶与天然橡胶、碳酸钙、硫化剂、白炭黑、结构控制剂、硫化活性剂、阻燃剂、防老剂、硫化促进剂、色粉制备而成,抗菌改性甲基乙烯基硅橡胶搭配硫化活性剂,能够显著提高彩色橡胶制品的抗菌抑菌性能、强度、耐热性能,得到的制品例如彩色橡胶玩具,适用于作为儿童玩具用品,安全性好,使用寿命长；制作工艺通过冲压粘合裁切一体化设备完成冲压、粘合、裁切三道工序,压制出不同的形状,满足不同形状、尺寸橡胶制品的要求。(The invention discloses a colored rubber product and a manufacturing process thereof, and relates to the technical field of rubber products. The color rubber product is prepared from antibacterial modified methyl vinyl silicone rubber which is subjected to mixing modification by chitosan/zinc mixed antibacterial agent and fumed silica, natural rubber, calcium carbonate, vulcanizing agent, white carbon black, structure control agent, vulcanization activator, flame retardant, anti-aging agent, vulcanization accelerator and toner, the antibacterial modified methyl vinyl silicone rubber is matched with the vulcanization activator, so that the antibacterial property, the strength and the heat resistance of the color rubber product can be obviously improved, and the obtained product such as a color rubber toy is suitable for serving as a toy product for children, and has the advantages of good safety and long service life; the manufacturing process completes three procedures of stamping, bonding and cutting through stamping, bonding and cutting integrated equipment, presses different shapes and meets the requirements of rubber products with different shapes and sizes.)

1. The colored rubber product is characterized by being prepared from the following components in parts by weight: 80-120 parts of antibacterial modified methyl vinyl silicone rubber, 30-50 parts of natural rubber, 75-90 parts of calcium carbonate, 25-40 parts of vulcanizing agent, 15-25 parts of white carbon black, 8-15 parts of structure control agent, 10-16 parts of vulcanization activator, 0.5-2 parts of flame retardant, 2-6 parts of anti-aging agent, 3-7 parts of vulcanization accelerator and 8-15 parts of toner; the antibacterial modified methyl vinyl silicone rubber is obtained by shearing methyl vinyl silicone rubber, mixing with a chitosan/zinc mixed antibacterial agent and fumed silica, and then vulcanizing in two sections.

2. The colored rubber product of claim 1, wherein the antibacterial modified methyl vinyl silicone rubber is prepared by the following steps:

shearing methyl vinyl silicone rubber into sheets with the area of 0.2-0.6 cm multiplied by 0.2-0.6 cm, washing with deionized water, washing with acetone, ultrasonically washing with absolute ethyl alcohol, and drying to obtain sheet silicone rubber;

mixing a chitosan acetic acid aqueous solution with the concentration of 2-3 wt%, the viscosity of 200-300 mPa & s and the deacetylation degree of 90-95% with a zinc sulfate aqueous solution with the concentration of 0.5-2 wt% according to the mass ratio of 6-10: 1, and then adjusting the pH to 4-5 to obtain a chitosan/zinc mixed antibacterial agent;

mixing the sheet silicon rubber and the mixed antibacterial agent in a mixing mill, heating to 120-140 ℃, adding fumed silica accounting for 3-6% of the mass of the sheet silicon rubber, mixing for 20-35 min, and taking out the sheet;

and (3) after placing for 22-24 hours, performing primary vulcanization for 3-5 hours at 155-165 ℃ by using a flat vulcanizing machine, cooling to room temperature, placing in a forced air drying oven, performing secondary vulcanization for 3-5 hours at 190-210 ℃, and naturally cooling to room temperature to obtain the antibacterial modified methyl vinyl silicone rubber.

3. The colored rubber article of claim 1, wherein the structure control agent is selected from the group consisting of one or more of a cyclic silazane, hexamethyldisilazane, diphenylsilanediol, dimethyldimethoxysilane, dimethyldiethoxysilane, and methylphenyldiethoxysilane.

4. The colored rubber article of claim 1, wherein the vulcanization activator is selected from the group consisting of zinc oxide, zinc carbonate, magnesium oxide, and a mixture of one or more of high activity zinc oxide NC 205.

5. The colored rubber article of claim 1, wherein the flame retardant is selected from the group consisting of antimony trioxide, melamine cyanurate, pentabromotoluene, trisphenol phosphate, and a mixture of one or more of ditolyl phosphate; the anti-aging agent is one or more of N, N-di (beta-naphthyl) p-phenylenediamine, 2-mercaptobenzimidazole, N- (1, 3-dimethylbutyl) -N' -phenylenediamine and 2,2, 4-trimethyl-1, 2-dihydroquinoline polymer.

6. The colored rubber article of claim 1, wherein the vulcanizing agent is selected from the group consisting of benzoyl peroxide, t-butyl perbenzoate, dicumyl peroxide, and mixtures of one or more of 2, 4-dichlorobenzoyl peroxide; the vulcanization accelerator is one or more of dimethyldithiocarbamate, 2-mercaptoimidazoline, N-cyclohexyl-bis (2-mercaptobenzothiazole) sulfenamide and zinc dibutyl dithiocarbamate.

7. A process for manufacturing a coloured rubber article according to any one of claims 1 to 6, comprising the following steps:

s100, mixing: adding the antibacterial modified methyl vinyl silicone rubber, natural rubber, calcium carbonate, white carbon black, a structure control agent, a vulcanization activator, a flame retardant, an anti-aging agent and toner into an internal mixer according to parts by weight, mixing for 30-40 min at 145-165 ℃, and standing for 20-24 hours to obtain a mixed material;

s200, open mixing: adding the mixed materials into an open mill for open milling, adding a vulcanizing agent and a vulcanization accelerator, and discharging sheets;

s300, vulcanization molding: naturally cooling the discharged sheet to room temperature, performing primary vulcanization for 3-5 hours at 145-155 ℃ by using a flat vulcanizing machine, cooling to room temperature, placing the cooled sheet in a blast drying oven, performing secondary vulcanization for 3-5 hours at 180-195 ℃, and naturally cooling to room temperature to obtain vulcanized rubber;

s400, cutting and crushing: cutting vulcanized rubber into rubber strips, and crushing the rubber strips into particles with the particle size of 1-3 mm;

s500, stamping: stamping, bonding and cutting integrated equipment, and stamping the granular vulcanized rubber under the conditions that the pressure is 12-16 MPa and the temperature is 150-160 ℃ to obtain a first rubber semi-finished product and a second rubber semi-finished product;

s600, bonding: bonding the edge parts of the first rubber semi-finished product and the second rubber semi-finished product through an adhesive, and pressing under the conditions that the pressure is 1-2 MPa and the temperature is 120-135 ℃;

s700, cutting: and cutting redundant leftover materials and adhesives at the peripheries of the first rubber semi-finished product and the second rubber semi-finished product to obtain the colored rubber product.

8. The manufacturing process of the colored rubber product according to claim 7, wherein the step S500 is specifically to place the granular vulcanized rubber in a lower stamping die (23) of the stamping, bonding and cutting integrated equipment, to enable the concave arc-shaped surface of the lower stamping die (23) to face upwards, drive an upper stamping die (13) to move downwards by an upper hydraulic cylinder (12), and stamp under the conditions of the pressure of 12-16 MPa and the temperature of 150-160 ℃ to obtain a first rubber semi-finished product, and take out the first rubber semi-finished product;

and starting a side rotating motor (22), driving a rotating shaft (23) to rotate through a coupler (24), driving a lower stamping die (23) to rotate by the rotating shaft (23) to enable the outer convex arc surface of the lower stamping die to face upwards, driving an upper stamping die (13) to move downwards by an upper hydraulic cylinder (12), stamping under the conditions of pressure of 12-16 MPa and temperature of 150-160 ℃ to obtain a second rubber semi-finished product, and taking out.

9. The manufacturing process of a colored rubber product according to claim 7, wherein step S600 is to place the first rubber semi-finished product in a lower stamping die, open the check valve (34), and allow the adhesive in the adhesive tank (35) to enter the step (31) through the liquid inlet pipe (32); and (3) placing the second rubber semi-finished product above the first rubber semi-finished product, driving an upper stamping die (13) to move downwards by an upper hydraulic cylinder (12), and pressing under the conditions of pressure of 1-2 MPa and temperature of 120-135 ℃ so as to bond the edge parts of the first rubber semi-finished product and the second rubber semi-finished product by an adhesive.

10. The manufacturing process of a colored rubber product according to claim 7, wherein in step S700, the two linear electric cylinders (41) drive the screw rod (43) to move downward, and the screw rod (43) drives the cutting knife (42) to move downward, so as to cut off the excess leftover bits and adhesives around the periphery, thereby obtaining the colored rubber product.

Technical Field

The invention relates to the technical field of rubber products, in particular to a colored rubber product and a manufacturing process thereof.

Background

The rubber products are produced by using natural and synthetic rubber as raw materials, and also comprise rubber products produced by utilizing waste rubber, and the yield of the synthetic rubber is greatly higher than that of the natural rubber. Among the many synthetic rubbers, silicone rubber is the best of them, and it is tasteless and nontoxic, is not afraid of high temperature and resists cold, and does not lose its original strength and elasticity at 300 ℃ and-40 ℃. The silicon rubber also has good electrical insulation, oxidation resistance, aging resistance, light resistance, mildew resistance, chemical stability and the like. The high temperature resistance and safety of silicone rubber to human body make it used to make various parts contacting food container, such as hot pot gasket, seasoning, nipple, feeding bottle and drinking straw.

The patent application No. 201811242189.X discloses a colored rubber product and a manufacturing process thereof, and the colored rubber product comprises the following components: natural rubber, light calcium, white carbon black, naphthenic oil, zinc oxide, polyethylene glycol, stearic acid, protective wax, an anti-aging agent, magnesium carbonate, sulfur and an accelerator. The components are conventional raw materials, the raw materials are easy to obtain and low in cost, and the prepared colored rubber product is novel in style and structure, delicate in workmanship and good in quality. The following technical problems are found to exist: 1) the components of the product can not enable the product to achieve good antibacterial and bacteriostatic properties, strength, heat resistance and flame retardance, and the product is not suitable for being used as a rubber toy for children; 2) the manufacturing process can not efficiently stamp and bond rubber products with different shapes so as to meet diversified requirements.

Disclosure of Invention

The invention aims to provide a colored rubber product and a manufacturing process thereof, which are used for solving the problem that the components of the product in the prior art cannot enable the product to achieve good antibacterial and bacteriostatic properties, strength, heat resistance and flame retardance, and are not suitable for being used as rubber toys for children; the manufacturing process can not efficiently stamp and bond rubber products with different shapes so as to meet the technical problem of diversified requirements.

The purpose of the invention can be realized by the following technical scheme:

the invention provides a colored rubber product which is prepared from the following components in parts by weight: 80-120 parts of antibacterial modified methyl vinyl silicone rubber, 30-50 parts of natural rubber, 75-90 parts of calcium carbonate, 25-40 parts of vulcanizing agent, 15-25 parts of white carbon black, 8-15 parts of structure control agent, 10-16 parts of vulcanization activator, 0.5-2 parts of flame retardant, 2-6 parts of anti-aging agent, 3-7 parts of vulcanization accelerator and 8-15 parts of toner; the antibacterial modified methyl vinyl silicone rubber is obtained by shearing methyl vinyl silicone rubber, mixing with a chitosan/zinc mixed antibacterial agent and fumed silica, and then vulcanizing in two sections.

As a further preferable embodiment of the present invention, the preparation method of the antibacterial modified methyl vinyl silicone rubber is as follows:

shearing methyl vinyl silicone rubber into sheets with the area of 0.2-0.6 cm multiplied by 0.2-0.6 cm, washing with deionized water, washing with acetone, ultrasonically washing with absolute ethyl alcohol, and drying to obtain sheet silicone rubber;

mixing a chitosan acetic acid aqueous solution with the concentration of 2-3 wt%, the viscosity of 200-300 mPa & s and the deacetylation degree of 90-95% with a zinc sulfate aqueous solution with the concentration of 0.5-2 wt% according to the mass ratio of 6-10: 1, and then adjusting the pH to 4-5 to obtain a chitosan/zinc mixed antibacterial agent;

mixing the sheet silicon rubber and the mixed antibacterial agent in a mixing mill, heating to 120-140 ℃, adding fumed silica accounting for 3-6% of the mass of the sheet silicon rubber, mixing for 20-35 min, and taking out the sheet;

and (3) after placing for 22-24 hours, performing primary vulcanization for 3-5 hours at 155-165 ℃ by using a flat vulcanizing machine, cooling to room temperature, placing in a forced air drying oven, performing secondary vulcanization for 3-5 hours at 190-210 ℃, and naturally cooling to room temperature to obtain the antibacterial modified methyl vinyl silicone rubber.

The antibacterial modified methyl vinyl silicone rubber is obtained by shearing methyl vinyl silicone rubber, mixing with a chitosan/zinc mixed antibacterial agent and fumed silica, and then vulcanizing for two sections; after the methyl vinyl silicone rubber is washed by deionized water, acetone and absolute ethyl alcohol by ultrasonic cleaning, removing impurities on the surface and in the interior of the methyl vinyl silicone rubber, and keeping the surface and the interior of the methyl vinyl silicone rubber clean; the deacetylated chitosan can be well compatible in an acetic acid aqueous solution due to hydroxyl and primary amino groups in the structure, the primary amino groups and the hydroxyl groups are combined with zinc ions through coordination bonds, and the deacetylated chitosan is compatible with methyl vinyl silicone rubber, so that the surface hydrophilicity of the deacetylated chitosan is improved, the adhesion of bacteria and impurities on the surface is reduced, and the high-efficiency and long-term antibacterial and bacteriostatic performance is maintained; the carbon-carbon double bond in the methyl vinyl silicone rubber is reserved, so that the subsequent vulcanization polymerization is facilitated; due to the good specific surface area and the bonded silicon hydroxyl groups which mutually form hydrogen bonds in the structure, in the mixing process of the fumed silica and the methyl vinyl silicone rubber, the chain-shaped molecular structure of the methyl vinyl silicone rubber is stably adsorbed and uniformly distributed, the strength, the corrosion resistance and the heat resistance of the methyl vinyl silicone rubber are improved, and after vulcanization at two ends, moisture is completely removed, so that the antibacterial modified methyl vinyl silicone rubber material with excellent antibacterial and bacteriostatic properties, strength and heat resistance is obtained.

As a further preferred embodiment of the present invention, the structure-controlling agent is selected from one or more of the group consisting of a cyclic silazane, hexamethyldisilazane, diphenylsilanediol, dimethyldimethoxysilane, dimethyldiethoxysilane, and methylphenyldiethoxysilane.

As a further preferred embodiment of the present invention, the vulcanization activator is selected from one or more of zinc oxide, zinc carbonate, magnesium oxide, and high-activity zinc oxide NC 205.

As a further preferable embodiment of the present invention, the flame retardant is selected from one or more of antimony trioxide, melamine cyanurate, pentabromotoluene, trisphenol phosphate, and ditolyl phosphate; the anti-aging agent is one or more of N, N-di (beta-naphthyl) p-phenylenediamine, 2-mercaptobenzimidazole, N-N' -phenylenediamine and 2,2, 4-trimethyl-1, 2-dihydroquinoline polymer.

As a further preferred embodiment of the present invention, the vulcanizing agent is selected from one or more of benzoyl peroxide, tert-butyl perbenzoate, dicumyl peroxide, and 2, 4-dichlorobenzoyl peroxide; the vulcanization accelerator is one or more of dimethyldithiocarbamate, 2-thioimidazoline, N-cyclohexyl-bis-sulfenamide and zinc dibutyl-dithiocarbamate.

The invention also provides a manufacturing process of the colored rubber product, which comprises the following steps:

s100, mixing: adding the antibacterial modified methyl vinyl silicone rubber, natural rubber, calcium carbonate, white carbon black, a structure control agent, a vulcanization activator, a flame retardant, an anti-aging agent and toner into an internal mixer according to parts by weight, mixing for 30-40 min at 145-165 ℃, and standing for 20-24 hours to obtain a mixed material;

s200, open mixing: adding the mixed materials into an open mill for open milling, adding a vulcanizing agent and a vulcanization accelerator, and discharging sheets;

s300, vulcanization molding: naturally cooling the discharged sheet to room temperature, performing primary vulcanization for 3-5 hours at 145-155 ℃ by using a flat vulcanizing machine, cooling to room temperature, placing the cooled sheet in a blast drying oven, performing secondary vulcanization for 3-5 hours at 180-195 ℃, and naturally cooling to room temperature to obtain vulcanized rubber;

s400, cutting and crushing: cutting vulcanized rubber into rubber strips, and crushing the rubber strips into particles with the particle size of 1-3 mm;

s500, stamping: stamping, bonding and cutting integrated equipment, and stamping the granular vulcanized rubber under the conditions that the pressure is 12-16 MPa and the temperature is 150-160 ℃ to obtain a first rubber semi-finished product and a second rubber semi-finished product;

s600, bonding: bonding the edge parts of the first rubber semi-finished product and the second rubber semi-finished product through an adhesive, and pressing under the conditions that the pressure is 1-2 MPa and the temperature is 120-135 ℃;

s700, cutting: and cutting redundant leftover materials and adhesives at the peripheries of the first rubber semi-finished product and the second rubber semi-finished product to obtain the colored rubber product.

As a further preferable scheme of the invention, step S500 specifically includes placing the granular vulcanized rubber in a lower stamping die of the stamping, bonding and cutting integrated equipment, so that the concave arc-shaped surface of the lower stamping die faces upward, driving the upper stamping die to move downward by an upper hydraulic cylinder, stamping under the conditions of a pressure of 12-16 MPa and a temperature of 150-160 ℃ to obtain a first rubber semi-finished product, and taking out;

and starting a side rotating motor, driving a rotating shaft to rotate through a coupler, driving a lower stamping die to rotate by the rotating shaft to enable the outer convex arc surface of the lower stamping die to face upwards, driving the upper stamping die to move downwards by an upper hydraulic cylinder, stamping under the conditions of the pressure of 12-16 MPa and the temperature of 150-160 ℃ to obtain a second rubber semi-finished product, and taking out.

As a further preferable scheme of the present invention, step S600 specifically includes placing the first rubber semi-finished product in a lower stamping die, opening a check valve, and allowing an adhesive in an adhesive tank to enter the step through a liquid inlet pipe; and placing the second rubber semi-finished product above the first rubber semi-finished product, driving the upper stamping die to move downwards by the upper hydraulic cylinder, and pressing under the conditions of pressure of 1-2 MPa and temperature of 120-135 ℃ so as to bond the edge parts of the first rubber semi-finished product and the second rubber semi-finished product by the adhesive.

As a further preferable scheme of the present invention, in step S700, two linear electric cylinders drive the screw rod to move downward, and the screw rod drives the cutting knife to move downward, so as to cut off the excess leftover material and the adhesive on the periphery, thereby obtaining the colored rubber product.

The invention has the following beneficial effects:

1. the color rubber product is prepared from antibacterial modified methyl vinyl silicone rubber which is subjected to mixing modification by chitosan/zinc mixed antibacterial agent and fumed silica, natural rubber, calcium carbonate, vulcanizing agent, white carbon black, structure control agent, vulcanization activator, flame retardant, anti-aging agent, vulcanization accelerator and toner.

2. The invention relates to a manufacturing process of a colored rubber product, which finishes three working procedures of punching, bonding and cutting by punching, bonding and cutting integrated equipment, a side rotating motor drives a rotating shaft to rotate to drive a lower punching die to rotate, the upper part and the lower part of the lower punching die are set into different shapes, and the upper punching die is matched to press different shapes, so that the diversified requirements of rubber products with different shapes and sizes are met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of a process for manufacturing a colored rubber product according to the present invention;

FIG. 2 is a three-dimensional view of a die bonding and cutting integrated apparatus for colored rubber products in an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a die bonding and cutting integrated apparatus for a colored rubber product according to an embodiment of the present invention;

FIG. 4 is a front view of a press bonding and cutting integrated apparatus for colored rubber products in an embodiment of the present invention;

FIG. 5 is a top view of a die bonding and cutting integrated apparatus for colored rubber products in an embodiment of the present invention;

FIG. 6 is a schematic diagram of a lower punch in an embodiment of the present invention;

FIG. 7 is a top view of a mating structure of a step and a lower stamping die according to an embodiment of the present invention;

fig. 8 is a schematic view of a matching structure of a screw and a cutting knife in an embodiment of the invention.

Reference numerals: 10. an upper punch mechanism; 11. an upper punch box; 12. an upper hydraulic cylinder; 13. an upper stamping die; 14. a vertical support column; 20. a lower punch mechanism; 21. a lower stamping box; 22. a side rotating electrical machine; 23. a lower stamping die; 24. a coupling; 25. a rotating shaft; 26. a rolling bearing seat; 27. side support columns; 28. perforating; 29. a press-fit cavity; 30. a guide post; 31. a step; 32. a liquid inlet pipe; 33. a flange plate; 34. a one-way valve; 35. an adhesive tank; 36. a liquid inlet cavity; 40. a cutting mechanism; 41. a linear electric cylinder; 42. cutting knife; 43. and a screw rod.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The colored rubber product of the embodiment is prepared from the following components in parts by weight: 106kg of antibacterial modified methyl vinyl silicone rubber, 42kg of natural rubber, 82kg of calcium carbonate, 35kg of vulcanizing agent, 20kg of white carbon black, 12kg of structure control agent dimethyl diethoxysilane, 12kg of vulcanization activator high-activity zinc oxide NC20513kg, 1.2kg of flame retardant melamine cyanurate, 4kg of anti-aging agent 2,2, 4-trimethyl-1, 2-dihydroquinoline polymer, 5kg of vulcanization accelerator 2-thiol imidazoline and 10kg of toner.

The preparation method of the antibacterial modified methyl vinyl silicone rubber comprises the following steps:

shearing methyl vinyl silicone rubber into sheets with the area of 0.2-0.6 cm multiplied by 0.2-0.6 cm, washing with deionized water, washing with acetone, ultrasonically washing with absolute ethyl alcohol, and drying to obtain sheet silicone rubber;

mixing a chitosan acetic acid aqueous solution with the concentration of 2.5 wt%, the viscosity of 200-300 mPa & s and the deacetylation degree of 90-95% with a zinc sulfate aqueous solution with the concentration of 1.2 wt% according to the mass ratio of 8:1, and adjusting the pH value to 4 to obtain a chitosan/zinc mixed antibacterial agent;

mixing the sheet silicon rubber and the mixed antibacterial agent in a mixing roll, heating to 135 ℃, adding fumed silica accounting for 5 percent of the mass of the sheet silicon rubber, mixing for 28min, and taking out the sheet;

and (3) after standing for 23 hours, performing primary vulcanization for 4.5 hours at 162 ℃ by using a flat vulcanizing machine, cooling to room temperature, then placing in an air-blast drying oven, performing secondary vulcanization for 4.5 hours at 205 ℃, and naturally cooling to room temperature to obtain the antibacterial modified methyl vinyl silicone rubber.

As shown in fig. 1, the manufacturing process of the colored rubber product of the embodiment includes the following steps:

s100, mixing: adding the antibacterial modified methyl vinyl silicone rubber, natural rubber, calcium carbonate, white carbon black, a structure control agent, a vulcanization activator, a flame retardant, an anti-aging agent and toner into an internal mixer according to parts by weight, mixing for 35min at 156 ℃, and standing for 22 hours to obtain a mixed material;

s200, open mixing: adding the mixed materials into an open mill for open milling, adding a vulcanizing agent and a vulcanization accelerator, and discharging sheets;

s300, vulcanization molding: naturally cooling the discharged sheet to room temperature, performing primary vulcanization for 4 hours at 150 ℃ by using a flat vulcanizing machine, cooling to room temperature, placing the cooled sheet in an air drying oven, performing secondary vulcanization for 4 hours at 186 ℃, and naturally cooling to room temperature to obtain vulcanized rubber;

s400, cutting and crushing: cutting vulcanized rubber into rubber strips, and crushing the rubber strips into particles with the particle size of 1-3 mm;

s500, stamping: punching, bonding and cutting integrated equipment to obtain a first rubber semi-finished product and a second rubber semi-finished product by punching granular vulcanized rubber under the conditions of pressure of 15MPa and temperature of 155 ℃;

s600, bonding: bonding the edge parts of the first rubber semi-finished product and the second rubber semi-finished product by an adhesive, and pressing under the conditions of 1.2MPa of pressure and 132 ℃;

s700, cutting: and cutting redundant leftover materials and adhesives at the peripheries of the first rubber semi-finished product and the second rubber semi-finished product to obtain the colored rubber product.

Example 2

The colored rubber product of the embodiment is prepared from the following components in parts by weight: 112kg of antibacterial modified methyl vinyl silicone rubber, 36kg of natural rubber, 82kg of calcium carbonate, 34kg of vulcanizing agent, 20kg of white carbon black, 11kg of structure control agent methyl phenyl diethoxysilane, 15kg of vulcanization activator zinc carbonate, 1.6kg of flame retardant dimethylbenzene phosphate, 5kg of anti-aging agent 2-mercaptobenzimidazole, 6kg of vulcanization accelerator N-cyclohexyl-bis (2-mercaptobenzothiazole) sulfenamide and 13kg of toner.

The preparation method of the antibacterial modified methyl vinyl silicone rubber comprises the following steps:

shearing methyl vinyl silicone rubber into sheets with the area of 0.2-0.6 cm multiplied by 0.2-0.6 cm, washing with deionized water, washing with acetone, ultrasonically washing with absolute ethyl alcohol, and drying to obtain sheet silicone rubber;

mixing a chitosan acetic acid aqueous solution with the concentration of 2.5 wt%, the viscosity of 200-300 mPa & s and the deacetylation degree of 90-95% with a zinc sulfate aqueous solution with the concentration of 1.6 wt% according to the mass ratio of 9:1, and adjusting the pH value to 5 to obtain a chitosan/zinc mixed antibacterial agent;

mixing the sheet silicon rubber and the mixed antibacterial agent in a mixing mill, heating to 136 ℃, adding fumed silica accounting for 5 percent of the mass of the sheet silicon rubber, mixing for 33min, and taking out the sheet;

and (3) after placing for 24 hours, carrying out primary vulcanization for 5 hours at 163 ℃ by using a flat vulcanizing machine, cooling to room temperature, placing in an air-blast drying oven, carrying out secondary vulcanization for 4 hours at 206 ℃, and naturally cooling to room temperature to obtain the antibacterial modified methyl vinyl silicone rubber.

The process for manufacturing the colored rubber product of the present example is the same as that of example 1.

Example 3

The colored rubber product of the embodiment is prepared from the following components in parts by weight: 115kg of antibacterial modified methyl vinyl silicone rubber, 45kg of natural rubber, 86kg of calcium carbonate, 36kg of vulcanizing agent, 22kg of white carbon black, 14kg of structure control agent hexamethyldisilazane, 12kg of vulcanization activator zinc oxide, 1.8kg of flame retardant antimony trioxide, 5kg of anti-aging agent N- (1, 3-dimethylbutyl) -N' -phenylenediamine, 6kg of vulcanization accelerator zinc dibutyl dithiocarbamate and 14kg of toner.

The preparation method of the antibacterial modified methyl vinyl silicone rubber comprises the following steps:

shearing methyl vinyl silicone rubber into sheets with the area of 0.2-0.6 cm multiplied by 0.2-0.6 cm, washing with deionized water, washing with acetone, ultrasonically washing with absolute ethyl alcohol, and drying to obtain sheet silicone rubber;

mixing a chitosan acetic acid aqueous solution with the concentration of 2.7 wt%, the viscosity of 200-300 mPa & s and the deacetylation degree of 90-95% with a zinc sulfate aqueous solution with the concentration of 1.5 wt% according to the mass ratio of 9:1, and then adjusting the pH to 4.5 to obtain a chitosan/zinc mixed antibacterial agent;

mixing the sheet silicon rubber and the mixed antibacterial agent in a mixing roll, heating to 138 ℃, adding fumed silica accounting for 6 percent of the mass of the sheet silicon rubber, mixing for 33min, and taking out the sheet;

and (3) after placing for 24 hours, carrying out primary vulcanization for 4 hours at 162 ℃ by using a flat vulcanizing machine, cooling to room temperature, placing in an air-blast drying oven, carrying out secondary vulcanization for 5 hours at 206 ℃, and naturally cooling to room temperature to obtain the antibacterial modified methyl vinyl silicone rubber.

The process for manufacturing the colored rubber product of the present example is the same as that of example 1.

Example 4

As shown in fig. 2-5, the embodiment provides a stamping, bonding and cutting integrated device for a color rubber product, which includes an upper stamping mechanism 10 and a lower stamping mechanism 20, wherein the upper stamping mechanism 10 includes an upper stamping box 11, an upper hydraulic cylinder 12 and an upper stamping die 13, the upper hydraulic cylinder 12 is disposed at the top center of the upper stamping box 11, and an expansion link of the upper hydraulic cylinder 12 vertically extends downwards into an inner cavity of the upper stamping box 11 to be connected with the upper stamping die 13; the lower stamping mechanism 20 comprises a lower stamping box 21, a side rotating motor 22 and a lower stamping die 23, wherein the side rotating motor 22 is arranged at one side of the lower stamping box 21, a motor shaft of the side rotating motor 22 is connected with a rotating shaft 25 horizontally extending into the lower stamping box 21 through a coupler 24, and the rotating shaft 25 penetrates through the lower stamping die 23 and can drive the lower stamping die 23 to rotate; the upper punch box 11 and the lower punch box 21 have a gap therebetween and are supported by a plurality of guide posts 30; two vertical support columns 14 are symmetrically arranged between the lower surface of the upper hydraulic cylinder 12 and the upper press box 11. The punching, bonding and cutting integrated equipment is also internally provided with a structure for heating the upper punching die 13 and the lower punching die 23, and the structure is selected from a heating wire or an electric heating rod.

Compared with the prior art, the punching, bonding and cutting integrated equipment for the color rubber products improves the structure of the lower punching mechanism 20, drives the rotating shaft 25 to rotate through the side rotating motor 22, drives the lower punching die 23 to rotate, sets the upper part and the lower part of the lower punching die 23 into different shapes, and presses the upper punching die 13 into different shapes to meet the requirements of rubber products with different shapes and sizes; the vertical support columns 14 have a good supporting effect on the upper hydraulic cylinder 12, and keep the stability of the upper stamping die 13 driven by the hydraulic cylinder 12 in the moving process.

As shown in fig. 3 and 6-8, a rolling bearing seat 26 is rotatably connected to the periphery of the end of the rotating shaft 25 near the inner wall of the lower pressing box 21, and two side supporting columns 27 extending into the lower pressing box 21 are symmetrically arranged on one side of the side rotating motor 22 near the lower pressing box 21. In this embodiment, the upper portion of the lower stamping die 23 is shaped like an inward concave arc, the lower portion thereof is shaped like an outward convex arc, and both sides thereof are provided with through holes 28 for the rotation shaft 25 to pass through. The rolling bearing seat 26 limits the end part of the rotating shaft 25 to rotate, and the consistency of the rotating shaft 25 in the rotating process is kept; the side support columns 27 support the side rotating motor 22 to maintain stability during rotation of the rotating shaft 25.

A pressing cavity 29 with a U-shaped section is arranged between the lower stamping die 23 and the top of the lower stamping box 21, a step 31 contacting with the periphery of the top of the lower stamping die 23 is arranged on the periphery of the pressing cavity 29, and the inner periphery of the step 31 is matched with the outer periphery of the upper stamping die 13 in size.

In this embodiment, the upper stamping die 13 is in a cylindrical shape with a cavity, and after the upper stamping die is matched with the upper part of the lower stamping die 23 for stamping, a first rubber semi-finished product with one cylindrical surface and one convex arc-shaped surface can be pressed; after the lower punching die 23 is matched with the lower part of the lower punching die for punching, a second rubber semi-finished product with one cylindrical surface and one concave arc-shaped surface can be pressed.

Of course, the shapes of the upper and lower stamping dies 13, 23 in this embodiment are not limited to this, and may be selected to be rectangular, square or irregular, specifically determined by the shape and size of the first and second rubber semi-finished products to be bonded.

A liquid inlet pipe 32 is arranged on one side of the lower stamping die 23 far away from the side rotating motor 22, a flange plate 33 is arranged at the end part of the liquid inlet pipe 32, the flange plate 33 is connected with an adhesive tank 35 through a one-way valve 34, and the liquid inlet pipe 32 penetrates through the lower stamping box 21 and enters the pressing cavity 29; the step 31 is higher than the lower stamping die 23, and a plurality of liquid inlet cavities 36 are distributed in the step 31 in an annular array. After the one-way valve 34 is opened, the adhesive in the adhesive tank 35 enters the pressing cavity 29 through the liquid inlet pipe 32 and enters the plurality of liquid inlet cavities 36, so that the two rubber semi-finished products placed in the upper stamping die 13 and the lower stamping die 23 are bonded through the adhesive; the liquid inlet cavity 36 increases the liquid inlet amount of the adhesive, and is beneficial to the distribution of the adhesive, so that the semi-finished rubber products are bonded more tightly.

The upper punch box 11 is provided with cutting mechanisms 40 at two sides of the upper hydraulic cylinder 12, each cutting mechanism 40 comprises a linear electric cylinder 41 and a cutting knife 42, a screw rod 43 of the linear electric cylinder 41 vertically extends downwards into the upper punch box 11, the tail end of the screw rod 43 is connected with the cutting knife 42, and the cutting direction of the cutting knife 42 faces the outside of the step 31.

The cutting knife 42 is semicircular and has an inward draft angle of 3-5 degrees from top to bottom.

The arrangement of the cutting mechanism 40 enables the linear electric cylinder 41 to drive the screw rod 43 to move downwards, then the cutting knife 42 moves downwards to the outside of the step 31 for cutting, redundant leftover materials and adhesives are cut off, and the two semicircular cutting knives 42 are more attached to the periphery of the pressing cavity 29, so that the cutting is more complete.

The stamping, bonding and cutting integrated equipment for the colored rubber product has the working method as follows:

a) placing granular vulcanized rubber into a lower stamping die 23, enabling the concave arc-shaped surface of the lower stamping die 23 to be upward, driving an upper stamping die 13 to move downwards by an upper hydraulic cylinder 12, stamping under the conditions of pressure of 12-16 MPa and temperature of 150-160 ℃ to obtain a first rubber semi-finished product, and taking out;

b) starting a side rotating motor 22, driving a rotating shaft 23 to rotate through a coupler 24, driving a lower stamping die 23 to rotate through the rotating shaft 23, enabling an outer convex arc surface of the lower stamping die to be upward, driving an upper stamping die 13 to move downwards through an upper hydraulic cylinder 12, stamping under the conditions of pressure of 12-16 MPa and temperature of 150-160 ℃ to obtain a second rubber semi-finished product, and taking out;

c) placing the first rubber semi-finished product in a lower stamping die, opening a one-way valve 34, and allowing the adhesive in an adhesive tank 35 to enter the step 31 through a liquid inlet pipe 32; placing the second rubber semi-finished product above the first rubber semi-finished product, driving an upper stamping die 13 to move downwards by an upper hydraulic cylinder 12, and pressing under the conditions of pressure of 1-2 MPa and temperature of 120-135 ℃ so as to bond the edge parts of the first rubber semi-finished product and the second rubber semi-finished product through an adhesive;

d) the two linear electric cylinders 41 drive the screw rod 43 to move downwards, and the screw rod 43 drives the cutting knife 42 to move downwards, so that redundant leftover materials and adhesives on the periphery are cut off, and the colored rubber product is obtained.

Comparative example 1

This example differs from example 1 in that the antibacterial modified methyl vinyl silicone rubber is replaced with methyl vinyl silicone rubber.

Comparative example 2

This example differs from example 1 in that no vulcanization activator is added.

Comparative example 3

This example differs from example 1 in that no structure-controlling agent was added.

Performance testing

The colored rubber products prepared in examples 1-3 and comparative examples 1-3 are tested for antibacterial property, tensile strength, elongation at break, tear strength and limiting oxygen index, wherein the antibacterial property test refers to the detection method in the standard GB/T31402-2015, and the specific test results are shown in the following table:

as can be seen from the table above, compared with the comparative example, the colored rubber product prepared by the embodiment of the invention has high sterilization rate on staphylococcus aureus and escherichia coli, excellent sterilization and bacteriostasis performance, good tensile strength, elongation at break and tearing strength, excellent explanation strength, high limit oxygen index and excellent heat resistance and flame retardance; comparative example 1 the sterilization rate, mechanical properties and flame retardancy were all significantly reduced due to the lack of chitosan/zinc mixed antimicrobial agent and the milling modification of fumed silica.

The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.