阅读说明：本技术 轮胎模具及其加工方法、轮胎的硫化方法及轮胎 (Tire mold and processing method thereof, tire vulcanization method and tire ) 是由 孙建 徐檬 解云龙 季军胜 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种轮胎模具及其加工方法、轮胎的硫化方法及轮胎,一种轮胎模具,包括模具基体,所述模具基体与轮胎接触部分固设有模具涂层,所述模具涂层的厚度为3.0μm～5.0μm,所述模具涂层表面粗糙度为Ra4～Ra6,所述模具涂层表面具有模具孔隙且孔隙率为10%～20%,控制轮胎模具的模具涂层的表面形貌参数,使得这种轮胎模具生产出的轮胎的表面黑度及色泽均匀度更高,保证轮胎表面黑度及色泽均匀度的同时能够有效减少轮胎中化学助剂的添加量,提高了轮胎的性能。(The invention discloses a tire mold and a processing method thereof, a vulcanization method of the tire and the tire, wherein the tire mold comprises a mold base body, a mold coating is fixedly arranged on a contact part of the mold base body and the tire, the thickness of the mold coating is 3.0-5.0 mu m, the surface roughness of the mold coating is Ra 4-Ra 6, the surface of the mold coating is provided with mold pores, the porosity is 10-20%, the surface morphology parameters of the mold coating of the tire mold are controlled, so that the surface blackness and the color uniformity of the tire produced by the tire mold are higher, the addition amount of chemical additives in the tire can be effectively reduced while the surface blackness and the color uniformity of the tire are ensured, and the performance of the tire is improved.)

1. A tire mold, comprising a mold base, characterized in that: the contact part of the mold substrate and the tire is fixedly provided with a mold coating, the thickness of the mold coating is 3.0-5.0 μm, the surface roughness of the mold coating is Ra 4-Ra 6, the surface of the mold coating is provided with mold pores, and the porosity is 10-20%.

2. The tire mold of claim 1, wherein: the porosity of the mold coating surface was 15%.

3. The tire mold of claim 1, wherein: the material of the die coating is chromium or a chromium compound.

4. The tire mold of claim 3, wherein: the material of the die coating is nickel chromium-chromium carbide.

5. A method of processing a tyre mould as claimed in any one of claims 1 to 4, comprising the steps of:

the method comprises the following steps: carrying out surface sand blasting treatment on the mold matrix until the surface of the mold matrix has no metallic luster;

step two: cleaning the surface of the mold matrix by alcohol, drying and preheating, and spraying the coating material on the surface of the mold matrix to form the mold coating.

6. The method of processing a tire mold as in claim 5, wherein: and carrying out surface sand blasting treatment on the mold base body by using brown corundum.

7. The method of processing a tire mold as in claim 5, wherein: plasma spray processes are used when spraying the coating material onto the mold substrate.

8. A method of vulcanizing a tire, characterized by: placing the tire into the tire mold of any one of claims 1-4, and controlling the curing external temperature to be 135 ℃ to 145 ℃.

9. A tire, characterized by: the tire is vulcanized by the vulcanization method of claim 8.

Technical Field

The invention relates to the technical field of tires, in particular to a tire mold and a processing method thereof, a tire vulcanization method and a tire.

Background

In order to reduce the formation and growth of cracks of the tire in the presence of ozone, protective wax and an anti-aging agent must be added to the rubber composition; due to the solubility problem of the protective wax in the rubber, it gradually migrates to the rubber surface of the tire, sequestering ozone and protecting the rubber. The anti-aging agent can also migrate to the surface of the rubber at the same time, and the thickness is not uniform, so that the phenomenon of film interference is generated, which is expressed as uneven color of the surface of the tire,

the chemical anti-aging agent is a brown product, and the chemical anti-aging agent causes the yellowing of the tire after migrating to the surface of the tire; and the tire is parked for a long time, and the yellowing degree of the tire is further increased by products of the chemical anti-aging agent degraded by ozone.

Disclosure of Invention

In order to solve the technical problems, the invention provides the tire mold and the processing method thereof, the tire vulcanization method and the tire, wherein the surface morphology parameters of the mold coating are controlled, so that the surface blackness and the color uniformity of the produced tire are higher, the surface blackness and the color uniformity of the tire are ensured, the addition amount of chemical additives in the tire can be effectively reduced, and the performance of the tire is improved.

In order to solve the technical problems, the invention adopts the following technical scheme:

a tire mold comprises a mold base body, wherein a mold coating is fixedly arranged on a contact part of the mold base body and a tire, the thickness of the mold coating is 3.0-5.0 mu m, the surface roughness of the mold coating is Ra 4-Ra 6, the surface of the mold coating is provided with mold pores, and the porosity is 10% -20%.

Further, the porosity of the mold coating surface was 15%.

Further, the material of the die coating is chromium or a chromium compound.

Further, the material of the die coating is nickel chromium-chromium carbide.

A processing method of a tire mold comprises the following steps:

the method comprises the following steps: carrying out surface sand blasting treatment on the mold matrix until the surface of the mold matrix has no metallic luster;

step two: cleaning the surface of the mold matrix by alcohol, drying and preheating, and spraying the coating material on the surface of the mold matrix to form the mold coating.

Specifically, the mold base was subjected to surface blasting using brown corundum.

Specifically, a plasma spray process is used when spraying the coating material onto the mold substrate.

A method for vulcanizing tyre includes putting tyre in mould, and controlling the external temp of vulcanization to 135-145 deg.C.

A tire vulcanized by the tire vulcanization method.

Compared with the prior art, the invention has the beneficial technical effects that:

1. the surface blackness and color uniformity of the tire produced by the tire mold are higher by controlling the surface morphology parameters of the mold coating of the tire mold, the addition amount of chemical additives in the tire can be effectively reduced while the blackness and color uniformity of the tire surface are ensured, and the performance of the tire is improved.

Drawings

FIG. 1 is a schematic flow chart of a method of manufacturing a tire mold according to the present invention;

FIG. 2 is an image of the surface of a new tire of comparative example 3 of the present invention magnified 100 times under an SEM electron microscope;

FIG. 3 is an SEM electron microscope image of the surface of a new tire at 100 times magnification in example 2 of the present invention;

FIG. 4 is an image of the surface of a new tire of comparative example 3 of the present invention magnified 1000 times under an SEM electron microscope;

FIG. 5 is an image of the surface of a new tire of example 2 of the present invention magnified 1000 times under an SEM electron microscope;

FIG. 6 is a schematic representation of the structure of the extinction voids of a tire of the present invention;

FIG. 7 is an image of the surface of a 6-month parked tire of comparative example 3 of the present invention magnified 1000 times under an SEM electron microscope;

FIG. 8 is an image of the surface of a6 month parked tire of example 2 of the present invention magnified 1000 times under an SEM electron microscope;

FIG. 9 is a graph showing comparative analysis results of surface precipitates of tires parked for 6 months in comparative example 3 and example 2 according to the present invention.

Detailed Description

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

A tire mold comprises a mold base body, wherein a mold coating is fixedly arranged on a contact part of the mold base body and a tire, the thickness of the mold coating is 3.0-5.0 mu m, the roughness of the surface of the mold coating is Ra 4-Ra 6, the surface of the mold coating is provided with mold pores, and the porosity is 10% -20%.

Preferably, the porosity of the mold coating surface is 15%.

The blackness of the tire surface is low, the color is yellow, the phenomenon is an optical phenomenon, if light is absorbed after irradiating the tire surface, the color and yellow phenomena are covered, and the blackness of the naked eye is high. Therefore, the micro-topography of the tire surface can be controlled by controlling the micro-topography of the surface of the vulcanization mold, so that a dull porous structure is formed, and the optical effect of the tire surface is changed.

In the present example, the mold coating surface roughness is Ra4, Ra5 or Ra6, and the porosity of the surface of the mold coating is 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19% or 20%, and the thickness of the mold coating is 3.0 μm, 3.1 μm, 3.2 μm, 3.3 μm, 3.4 μm, 3.5 μm, 3.6 μm, 3.7 μm, 3.8 μm, 3.9 μm, 4.0 μm, 4.1 μm, 4.2 μm, 4.3 μm, 4.4 μm, 4.5 μm, 4.6 μm, 4.7 μm, 4.8 μm, 4.9 μm or 5.0 μm, all of which can form mold pores on the surface of the mold coating and make the produced tire correspondingly effective matting pores occur, change the optical pores of the tire surface, make the tire surface matte effect high by adding a special matting aid, no yellowing after long-time storage.

The material of the die coating is chromium or a chromium compound; chromium and chromium compounds have extremely high hardness, and the chromium and chromium compounds have the advantages of long service life as a tire mold coating, capability of performing dry ice washing and sand washing according to normal washing frequency and the like, so that the chromium or chromium compounds are selected for the mold coating; the material of the die coating is preferably nickel chromium-chromium carbide.

A processing method of a tire mold comprises the following steps:

the method comprises the following steps: carrying out surface sand blasting treatment on the mold matrix until the surface of the mold matrix has no metallic luster;

step two: cleaning the surface of the mold matrix by alcohol, drying and preheating, and spraying the coating material on the surface of the mold matrix to form the mold coating.

Specifically, the mold base was subjected to surface blasting using brown corundum.

Specifically, a plasma spray process is used when spraying the coating material onto the mold substrate.

The plasma spraying is to convey the material into high-temperature plasma jet, the powder particles are instantly heated to a molten or semi-molten state by the high-temperature plasma jet, and the powder particles are respectively solidified on the surface of a substrate by taking single particles as units to form a layered sheet-shaped mold coating of metal or compound with special properties, and the coating can form a micro-pore structure.

The thickness, roughness and porosity of the coating surface can be controlled by existing conventional process parameters.

A method for vulcanizing tyre includes putting tyre in mould, and controlling the external temp of vulcanization to 135-145 deg.C.

The vulcanizing external temperature is the temperature of the mold matrix, and the vulcanizing external temperature is controlled within the range of 135-145 ℃, so that the speed of micromolecules migrating to the surface can be effectively controlled, and side reactions are reduced, thereby reducing micromolecule substances attached to the surface of the tire and improving the appearance of a new tire.

A tire vulcanized by the tire vulcanization method.

The technical effects of the present invention will be described in detail below with reference to comparative examples and examples.

Comparative example 1:

the thickness of the die coating was 2.5 μm, the surface roughness of the die coating was Ra3, the porosity of the die pores was 8%, and the external temperature of vulcanization was 130 ℃.

Comparative example 2:

the thickness of the mold coating was 5.5 μm, the surface roughness of the mold coating was Ra7, the porosity of the mold pores was 25%, and the vulcanization external temperature was 150 ℃.

Comparative example 3:

the mold coating was not used and the external temperature of the vulcanization was 140 ℃.