阅读说明：本技术 一种微粒粉体及其制备方法、应用 (Micro-particle powder and preparation method and application thereof ) 是由 安云飞 于 2021-11-09 设计创作，主要内容包括：本发明提供了一种微粒粉体及其制备方法、应用。所述制备方法包括如下步骤：首先云母和配料进行预处理,得到初加工粉体,然后初加工粉体进一步粉碎得到细微粒粉体,最后向细微粒粉体中添加偶联剂,进行加热搅拌处理,得到微粒粉体。配料包括黑云母、石英、炭黑、碳化硅、氧化锌、二氧化锆和刚玉砂,偶联剂包括石蜡、硬脂酸、芳烃油、硅烷、钛酸酯和硅烷偶联剂Si-69。所述微粒粉体包括采用上述制备方法得到的产品。所述应用包括微粒粉体在制备汽车轮胎气密层或制备汽车轮胎中的应用。本发明的有益效果可包括：工艺过程中可去除原料杂质,生产的微粒粉粒度分布窄；改性工艺的流程短、生产能耗低、制备成本低；改性微粒粉流动性好,光泽度高。(The invention provides a particle powder and a preparation method and application thereof. The preparation method comprises the following steps: firstly, mica and ingredients are pretreated to obtain primary processing powder, then the primary processing powder is further crushed to obtain fine particle powder, and finally a coupling agent is added into the fine particle powder to be heated and stirred to obtain the fine particle powder. The ingredients comprise biotite, quartz, carbon black, silicon carbide, zinc oxide, zirconium dioxide and corundum sand, and the coupling agent comprises paraffin, stearic acid, aromatic oil, silane, titanate and silane coupling agent Si-69. The particle powder comprises a product obtained by the preparation method. The application comprises the application of the particle powder in preparing an air-tight layer of an automobile tire or preparing the automobile tire. The beneficial effects of the invention can include: raw material impurities can be removed in the process, and the particle size distribution of the produced particles is narrow; the modification process has short flow, low production energy consumption and low preparation cost; the modified particle powder has good fluidity and high glossiness.)

1. A method for producing a fine particle powder, characterized by comprising the steps of:

mixing mica and ingredients to prepare a mixture;

pretreating the mixture to obtain primary processing powder;

further crushing the primary processed powder to obtain fine particle powder;

adding a coupling agent into the fine particle powder, and then performing heating treatment to obtain fine particle powder, wherein stirring is performed during the heating treatment; alternatively, the fine powder and the coupling agent are mixed uniformly and then subjected to heating treatment to obtain fine powder.

2. A method for producing a fine particle powder, characterized by comprising the steps of:

respectively pretreating mica and ingredients, and then mixing to obtain primary processing powder;

further crushing the primary processed powder to obtain fine particle powder;

adding a coupling agent into the fine particle powder, and then performing heating treatment to obtain fine particle powder, wherein stirring is performed during the heating treatment; alternatively, the fine powder and the coupling agent are mixed uniformly and then subjected to heating treatment to obtain fine powder.

3. The method for producing a fine particle powder according to claim 1 or 2, wherein the mass part of the mica is 30 to 75 parts based on 100 parts of the sum of the mass parts of the mica and the compounding ingredients.

4. The method for preparing fine particle powder according to claim 1 or 2, wherein the compounding comprises, by mass, 0 to 45: 0-35: 0 to 20: 0-10: 0-8: 0-5: 0-2 parts of biotite, quartz, carbon black, silicon carbide, zinc oxide, zirconium dioxide and corundum, wherein the biotite, quartz, carbon black, silicon carbide, zinc oxide, zirconium dioxide and corundum cannot be 0 at the same time.

5. The method of producing a fine particle powder according to claim 1, wherein the sum of the parts by mass of the fine powder and the coupling agent is 100 parts, and the part by mass of the fine particle powder is 95.50 to 99.85 parts.

6. The method for preparing fine particle powder according to claim 1, wherein the coupling agent comprises at least two of paraffin, stearic acid, aromatic oil, silane, titanate, and silane coupling agent Si-69.

7. The method for preparing fine particle powder according to claim 1, wherein the particle size of the raw powder is 10 to 80 μm, the whiteness is 38 to 65%, and the impurity content is less than 1%; the particle size of the particle powder is 3-15 μm, and the whiteness is 60-95%.

8. The method for producing a fine particle powder according to claim 1, wherein the heating temperature of the heating treatment is 50 to 200 ℃ and the heating time is 15 to 60 minutes, and the heating and stirring treatment is performed in a rotary kiln at a rotation speed of 1.0 to 1.8r/min and at a heating temperature of 50 to 200 ℃ and for a heating time of 15 to 60 minutes.

9. A fine particle powder comprising a product produced by the method for producing a fine particle powder according to any one of claims 1 to 9.

10. Use of the fine powder according to claim 9 for the production of an air-tight layer for a vehicle tyre or for the production of a vehicle tyre.

Technical Field

The invention belongs to the field of inorganic non-metallic materials, and particularly relates to a particle powder and a preparation method and application thereof.

Background

Mica is a layered silicate mineral with SiO as main ingredient₂、Al₂O₃And the like. The mica sheet has the characteristics of large diameter-thickness ratio, uniform surface mechanical property, high bending modulus, insulation, heat resistance, moisture resistance, corrosion resistance and the like, and is widely applied as a reinforcing filler, such as a mica-rubber composite material and the like. The traditional inert filler used in the rubber industry of China cannot meet the requirements of the current market on the product performance, and when the filler obtained by activating crushed mica powder with a coupling agent is used in rubber, the product shows all flame retardant, temperature resistant, insulating, reinforcing, optical activity and corrosion resistant characteristics of mineral raw materials, and the production cost of the product can be effectively reduced.

At present, methods for maintaining high air tightness of rubber are various, for example, tires processed and produced by selecting special rubber or selecting chemically modified natural rubber as raw materials have high air tightness. For example, the addition of certain fillers to rubber formulations is another valuable way to improve the air impermeability of tires. Through natural rubber and a filler, the prepared rubber has good air tightness, but the mechanical property of vulcanized rubber is obviously reduced by adding the filler.

The process for producing modified rubber by dipping the filler in a rubber solution for modification with a certain concentration, refluxing and stirring, distilling and drying, and then matching the filler with a rubber vulcanization formula, wherein the process for producing modified rubber by pressure vulcanization on a press has the defects of various filler raw materials and complicated process, and is not beneficial to industrial application.

Disclosure of Invention

The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, an object of the present invention is to provide a method for producing a fine particle powder. Another object of the present invention is to provide a fine particle powder. For another example, it is another object of the present invention to provide a use of the fine particle powder.

In order to achieve the above object, an aspect of the present invention provides a fine particle powder preparation method.

The preparation method can comprise the following steps: mixing mica and ingredients to prepare a mixture; pretreating the mixture to obtain primary processing powder; further crushing the primary processed powder to obtain fine particle powder; adding a coupling agent into the fine particle powder, and then performing heating treatment to obtain fine particle powder, wherein stirring is performed during the heating treatment; alternatively, the fine powder and the coupling agent are mixed uniformly and then subjected to heating treatment to obtain fine powder.

In another aspect of the invention, a method for preparing a fine particle powder is provided.

The preparation method can comprise the following steps: respectively pretreating mica and ingredients, and then mixing to obtain primary processing powder; further crushing the primary processed powder to obtain fine particle powder; adding a coupling agent into the fine particle powder, and then performing heating treatment to obtain fine particle powder, wherein stirring is performed during the heating treatment; alternatively, the fine powder and the coupling agent are mixed uniformly and then subjected to heating treatment to obtain fine powder.

In one or more exemplary embodiments of the present invention, the mica may be 30 to 75 parts by mass based on 100 parts by mass of the sum of the parts by mass of the mica and the ingredients.

In one or more exemplary embodiments of the present invention, the ingredients may include, by mass, 0 to 45: 0-35: 0 to 20: 0-10: 0-8: 0-5: 0-2 parts of biotite, quartz, carbon black, silicon carbide, zinc oxide, zirconium dioxide and corundum, wherein the biotite, quartz, carbon black, silicon carbide, zinc oxide, zirconium dioxide and corundum cannot be 0 at the same time.

In one or more exemplary embodiments of the present invention, the ingredients may include one or more of biotite, quartz, carbon black, silicon carbide, zinc oxide, zirconium dioxide, and corundum sand.

In one or more exemplary embodiments of the present invention, the fine particulate powder may be 95.50 to 99.85 parts by mass based on 100 parts by mass of the sum of the fine particulate powder and the coupling agent.

In one or more exemplary embodiments of the present invention, the coupling agent may include at least two of paraffin wax, stearic acid, aromatic oil, silane, titanate, and silane coupling agent Si-69.

In one or more exemplary embodiments of the present invention, the coupling agent may include a coupling agent in a mass ratio of 0 to 2.50: 0-1.20: 0-0.80: 0-0.65: 0-0.30: 0-0.12 of paraffin, stearic acid, aromatic oil, silane, titanate and a silane coupling agent Si-69.

In one or more exemplary embodiments of the present invention, the primary processed powder may have a particle size of 10 to 80 μm, a whiteness of 38 to 65%, and an impurity content of less than 1%. The particle size of the fine particle powder can be 3-15 μm, and the whiteness can be 60-95%.

In one or more exemplary embodiments of the present invention, the heating temperature of the heating process may be 50 to 200 ℃, and the heating time may be 15 to 60 min.

In one or more exemplary embodiments of the present invention, the heating and stirring process may be performed in a rotary kiln, the rotation speed of the rotary kiln may be 1.0 to 1.8r/min, the heating temperature may be 50 to 200 ℃, and the heating time may be 15 to 60 min.

Further, after the heating treatment, the method may further include a step of cooling, including furnace temperature cooling.

In yet another aspect of the present invention, a fine particle powder is provided.

The fine particle powder may include a product prepared by the method for preparing a fine particle powder as described above.

In another aspect, the invention provides a use of the fine particle powder.

The application can comprise the application of the micro-particle powder in preparing an air-tight layer of an automobile tire or preparing the automobile tire.

For example, when the powder is applied to preparing a tire inner liner, the particle powder can be mixed with brominated butyl rubber and butyl reclaimed rubber to prepare the automobile tire inner liner.

Compared with the prior art, the beneficial effects of the invention can include: raw material impurities can be removed in the process, and the particle size distribution of the produced particles is narrow; the modification process has short flow, low production energy consumption and low preparation cost; the obtained modified particle powder has good fluidity and high glossiness.

Drawings

Fig. 1 shows a microscopic view of a fine particle powder in a tire of example 1 of the present invention.

Fig. 2 shows a microscopic view of the fine particle powder in a tire of example 2 of the present invention.

Fig. 3 shows a microscopic view of the fine particle powder in a tire of example 3 of the present invention.

Detailed Description

Hereinafter, a fine particle powder, a method for producing the same, and applications of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

At present, the air tightness of the tire can be improved by adding a filler into the rubber, but the preparation of the filler limits industrial application. On one hand, the preparation process of the filler is difficult, the raw materials are more, and on the other hand, the mechanical property of the rubber is reduced by adding the filler. The invention provides a method for preparing particle powder, which has the advantages of short flow of a modification process, low production energy consumption, low preparation cost, good flowability of the modified particle powder and high glossiness.

At present, methods for maintaining high air tightness of rubber are various, for example, tires processed and produced by selecting special rubber or selecting chemically modified natural rubber as raw materials have high air tightness. For example, the addition of certain fillers to rubber formulations is another valuable way to improve the air impermeability of tires. But the production process has the defects of multiple types of filler raw materials and complicated process, and is not beneficial to industrial application.

First exemplary embodiment

In a first exemplary embodiment of the present invention, there is provided a fine particulate powder production method including the steps of:

s10: mixing mica and ingredients to prepare a mixture, and pretreating the mixture to obtain the primary processing powder.

S20: the primary processed powder is further pulverized to obtain fine particle powder.

S30: adding a coupling agent into the fine particle powder, and then performing heating treatment to obtain fine particle powder, wherein stirring is performed during the heating treatment; alternatively, the fine powder and the coupling agent are mixed uniformly and then subjected to heating treatment to obtain fine powder.

In this example, the pretreatment includes jaw crushing, air classification and classification, and the further pulverization includes jet milling.

In the embodiment, the sum of the mass parts of the mica and the ingredients is 100 parts, and the mass part of the mica is 30-75 parts.

In the embodiment, the ingredients comprise, by mass, 0-45 (e.g., 0.1, 1, 10, 20, 25, 30, 40, 44): 0 to 35 (e.g., 0.1, 1, 10, 15, 20, 25, 30, 34): 0 to 20 (e.g., 0.1, 1, 5, 10, 15, 19): 0 to 10 (e.g., 0.1, 1, 5, 9): 0 to 8 (e.g., 0.1, 1, 4, 7): 0 to 5 (e.g., 0.1, 1, 2, 4): 0 to 2 (e.g., 0.1, 1, 1.5, 1.9) of one or more of biotite, quartz, carbon black, silicon carbide, zinc oxide, zirconium dioxide, and corundum sand.

In this example, the sum of the parts by mass of the fine powder and the coupling agent is 100 parts, and the parts by mass of the fine powder is 95.50 to 99.85 parts, for example, 96 parts, 97 parts, 98 parts, and 99 parts.

In this embodiment, the coupling agent includes at least two of stearic acid, aromatic oil, paraffin, silane, titanate, and silane coupling agent Si-69. Further, the coupling agent comprises the following components in a mass ratio of 0-2.50 (such as 0.1, 1, 1.5, 2, 2.4): 0 to 1.20 (e.g., 0.1, 0.5, 1.1): 0 to 0.80 (e.g., 0.1, 0.4, 0.6, 0.79): 0 to 0.65 (e.g., 0.1, 0.3, 0.5, 0.64): 0 to 0.30 (e.g., 0.1, 0.15, 0.20, 0.25): 0 to 0.12 (e.g., 0.1, 0.05, 0.07, 0.11) of paraffin, stearic acid, aromatic oil, silane, titanate, and silane coupling agent Si-69.

In this embodiment, the particle size of the raw powder is 10 to 80 μm, the whiteness is 38 to 65%, and the impurity content is less than 1%, for example, the particle size of the raw powder is 11, 20, 30, 40, 50, 60, 70, 79 μm, and the whiteness is 39%, 40%, 45%, 50%, 55%, 60%, 64%. The particle size of the fine particle powder is 3 to 15 μm, and the whiteness is 60 to 95%, for example, the particle size of the fine particle powder is 4, 6, 8, 10, 12, 14 μm, and the whiteness is 61%, 70%, 80%, 90%, 94%.

Specifically, the mica powder is of a sheet structure, so that the surface is smooth, the friction coefficient is small, the adhesion is not easy, and in the tire manufacturing process, the mica powder release agent can obviously improve the release performance, the surface of a product is smooth, and the service life of a mold is prolonged. If the impurity content in the primary processing powder is too high, the adhesion between the product and the grinding tool is increased, and the demoulding effect is poor.

In this embodiment, the heating temperature of the heating treatment is 50 to 200 ℃, the heating time is 15 to 60min, for example, the heating temperature is 51, 60, 80, 100, 130, 150, 170, 190, 199 ℃, and the heating time is 16, 30, 40, 50, 59 min.

Specifically, at temperatures below 50 ℃, the coupling agent cannot be fully activated and the filler obtained has poor properties. And if the temperature is higher than 200 ℃, the coupling agent loses activity or the activity is reduced due to high temperature, and the performance of the obtained filler cannot meet the actual production requirement. Heating times have a similar effect, with too short or too long heating times degrading the filler properties.

In this embodiment, the heating and stirring treatment is performed in a rotary kiln, the rotation speed of the rotary kiln is 1.0 to 1.8r/min, the heating temperature is 50 to 200 ℃, and the heating time is 15 to 60min, for example, the rotation speed of the rotary kiln is 1.1, 1.4, 1.7r/min, the heating temperature is 51, 60, 80, 100, 130, 150, 170, 190, 199 ℃, and the heating time is 16, 30, 40, 50, 59 min.

Further, after the heating treatment, the method further comprises a step of cooling, wherein the cooling comprises furnace temperature cooling or natural draft cooling.

Further, the furnace cooling is more energy-saving; in the actual production process, natural wind can be used for cooling, and the cooling speed can be 2-30 ℃/min, for example, the cooling speed is 3, 10, 15, 20, 25, 29 ℃/min.

Second exemplary embodiment

In a second exemplary embodiment of the present invention, there is provided a fine particulate powder production method including the steps of:

a10: and (3) respectively pretreating mica and the ingredients, and then mixing to obtain the primary processing powder.

A20: the primary processed powder is further pulverized to obtain fine particle powder.

A30: adding a coupling agent into the fine particle powder, and then performing heating treatment to obtain fine particle powder, wherein stirring is performed during the heating treatment; alternatively, the fine powder and the coupling agent are mixed uniformly and then subjected to heating treatment to obtain fine powder.

Step a10 in the present exemplary embodiment differs from step S10 in the first exemplary embodiment only in that the order of mixing and preprocessing is different, and the other contents are the same, for example:

in this embodiment, the pretreatment may include jaw crushing, air classification and classification, and the further comminution may include jet milling.

In the embodiment, the sum of the mass parts of the mica and the ingredients is 100 parts, and the mass part of the mica is 30-75 parts.

In the embodiment, the ingredients comprise, by mass, 0-45 (e.g., 0.1, 1, 10, 20, 25, 30, 40, 44): 0 to 35 (e.g., 0.1, 1, 10, 15, 20, 25, 30, 34): 0 to 20 (e.g., 0.1, 1, 5, 10, 15, 19): 0 to 10 (e.g., 0.1, 1, 5, 9): 0 to 8 (e.g., 0.1, 1, 5, 9): 0 to 5 (e.g., 0.1, 1, 2, 4): 0 to 2 (e.g., 0.1, 1, 1.5, 1.9) of one or more of biotite, quartz, carbon black, silicon carbide, zinc oxide, zirconium dioxide, and corundum sand.

Steps a20 and a30 in the present exemplary embodiment may be the same as steps S20, S30 in the first exemplary embodiment, respectively. For example:

in this example, the sum of the parts by mass of the fine powder and the coupling agent is 100 parts, and the parts by mass of the fine powder is 95.50 to 99.85 parts, for example, 96 parts, 97 parts, 98 parts, and 99 parts.

In the embodiment, the coupling agent comprises the following components in a mass ratio of 0-2.50 (for example, 0.1, 1, 1.5, 2, 2.4): 0 to 1.20 (e.g., 0.1, 0.5, 1.1): 0 to 0.80 (e.g., 0.1, 0.4, 0.6, 0.79): 0 to 0.65 (e.g., 0.1, 0.3, 0.5, 0.64): 0 to 0.30 (e.g., 0.1, 0.15, 0.20, 0.25): 0 to 0.12 (e.g., 0.1, 0.05, 0.07, 0.11) of at least two of paraffin, stearic acid, aromatic oil, silane, titanate, and silane coupling agent Si-69.

In this embodiment, the particle size of the raw powder is 10 to 80 μm, the whiteness is 38 to 65%, and the impurity content is less than 1%, for example, the particle size of the raw powder is 11, 20, 30, 40, 50, 60, 70, 79 μm, and the whiteness is 39%, 40%, 45%, 50%, 55%, 60%, 64%.

In the present embodiment, the particle size of the fine particle powder is 3 to 15 μm, and the whiteness is 60 to 95%, for example, the particle size of the fine particle powder is 4, 6, 8, 10, 12, 14 μm, and the whiteness is 61%, 70%, 80%, 90%, 94%.

In this embodiment, the heating temperature of the heating treatment is 50 to 200 ℃, the heating time is 15 to 60min, for example, the heating temperature is 51, 60, 80, 100, 130, 150, 170, 190, 199 ℃, and the heating time is 16, 30, 40, 50, 59 min. In this embodiment, the heating and stirring treatment is performed in a rotary kiln, the rotation speed of the rotary kiln is 1.0 to 1.8r/min, the heating temperature is 50 to 200 ℃, and the heating time is 15 to 60min, for example, the rotation speed of the rotary kiln is 1.1, 1.4, 1.7r/min, the heating temperature is 51, 60, 80, 100, 130, 150, 170, 190, 199 ℃, and the heating time is 16, 30, 40, 50, 59 min.

Further, after the heating treatment, the method further comprises a step of cooling, wherein the cooling comprises furnace temperature cooling.

Third exemplary embodiment

In a third exemplary embodiment of the present invention, a fine particulate powder is provided.

The fine particle powder may include a product produced by the method for producing a fine particle powder according to the first or second exemplary embodiment described above.

Fourth exemplary embodiment

In a fourth exemplary embodiment of the present invention, there is provided the use of the above fine particle powder for the preparation of an inner liner of an automobile tire or for the preparation of an automobile tire.

For example, when the rubber is used, the fine particle powder can be mixed with brominated butyl rubber and butyl reclaimed rubber to prepare an automobile tire inner liner. Of course, the invention is not limited to brominated butyl rubber, butyl reclaimed rubber, and other formulations can be used.

For a better understanding of the above-described exemplary embodiments of the present invention, the following description will be given of a method for producing a fine particle powder in conjunction with a specific example.

Example 1

The present example is a method for producing a fine particle powder, the method comprising the steps of:

(1) mixing mica with adjuvants to obtain mixture, wherein the adjuvants include black mica, quartz, carbon black, silicon carbide, zinc oxide, zirconium dioxide and corundum sand. Wherein, in the mixture, by mass percentage, the mica accounts for 65%, the black mica accounts for 12%, the quartz accounts for 10%, the carbon black accounts for 5%, the silicon carbide accounts for 2%, the zinc oxide accounts for 2%, the zirconium dioxide accounts for 2%, and the corundum accounts for 2%.

(2) Carrying out jaw crushing, air separation and classification on the mixture to obtain primary processed powder, wherein the particle size of the primary processed powder is 50 mu m, the whiteness is 50%, and the primary processed powder is blue-white and silvery-white; wherein the impurity content is less than 1%.

(3) And further carrying out jet milling on the primary processed powder to obtain fine particle powder, wherein the particle size of the fine particle powder is 12 mu m, and the whiteness is 70%.

(4) The coupling agent was added to the fine particle powder in an amount of 95.50 parts by mass, 2.20 parts by mass of paraffin, 1.05 parts by mass of stearic acid, 0.52 parts by mass of aromatic oil, 0.45 parts by mass of silane, 0.20 parts by mass of titanate, and 0.08 parts by mass of silane coupling agent Si-69. And then carrying out heating treatment in a rotary kiln, wherein stirring is carried out in the heating treatment at the rotating speed of 1.5r/min, the heating temperature of 150 ℃ and the heating time of 30min to obtain the particle powder.

(5) Mixing 8 parts of the fine particle powder, 92 parts of brominated butyl rubber and butyl reclaimed rubber according to parts by weight to prepare an automobile tire air-tight layer, and further preparing the tire, wherein the air-tight layer has the tensile strength of 6MPa, the elongation at break of 650 percent, the Shore hardness of 52 and the air permeability systemNumber 1.2X 10^-13. The tire was subjected to electron microscope scanning to obtain a microscopic image as shown in fig. 1, in which the white particles in fig. 1 were fine particle powder, and it can be seen from fig. 1 that the fine particle powder had a uniform particle size and was uniformly dispersed in the tire.

Example 2

The present example is a method for producing a fine particle powder, the method comprising the steps of:

(1) mixing mica with adjuvants to obtain mixture, wherein the adjuvants include black mica, quartz, carbon black, silicon carbide, zinc oxide, zirconium dioxide and corundum sand. Wherein, in the mixture, by mass percentage, the mica accounts for 50%, the black mica accounts for 20%, the quartz accounts for 15%, the carbon black accounts for 6%, the silicon carbide accounts for 3%, the zinc oxide accounts for 2%, the zirconium dioxide accounts for 2%, and the corundum accounts for 2%.

(2) Carrying out jaw crushing, air separation and classification on the mixture to obtain primary processed powder, wherein the particle size of the primary processed powder is 60 mu m, the whiteness is 60 percent, and the primary processed powder is blue-white and silvery-white; wherein the impurity content is less than 1%.

(3) And further carrying out jet milling on the primary processed powder to obtain fine particle powder, wherein the particle size of the fine particle powder is 15 mu m, and the whiteness is 68%.

(4) The coupling agent is added to the fine particle powder, and the fine particle powder comprises 96 parts by mass, 1.4 parts by mass of paraffin, 1.2 parts by mass of stearic acid, 0.55 part by mass of aromatic oil, 0.45 part by mass of silane, 0.30 part by mass of titanate, and 0.1 part by mass of silane coupling agent Si-69. And then carrying out heating treatment in a rotary kiln, wherein stirring is carried out in the heating treatment at the rotating speed of 1.8r/min, the heating temperature of 200 ℃ and the heating time of 30min to obtain the particle powder.

(5) Mixing 10 parts of the particle powder with 90 parts of brominated butyl rubber, butyl reclaimed rubber and other formula materials according to the mass parts to prepare the automobile tire air-tight layer, and further preparing the tire, wherein the tensile strength of the air-tight layer is 6.3MPa, the elongation at break is 680 percent, the Shore hardness is 53, and the air permeability coefficient is 1.18 multiplied by 10^-13. The tire was subjected to electron microscope scanning to obtain a microscopic image as shown in fig. 2, in which the white particles in fig. 2 were fine particle powders, and it can be seen from fig. 2 that the fine particle powders were uniform in particle size and uniformly dispersed in the tire.

Example 3

The present example is a method for producing a fine particle powder, the method comprising the steps of:

(1) and (3) carrying out jaw crushing, air separation and grading on the mica and the ingredients respectively, and then mixing to obtain the primary processing powder. Wherein, in the mixture, by mass percentage, the mica accounts for 35%, the biotite accounts for 20%, the quartz accounts for 20%, the carbon black accounts for 10%, the silicon carbide accounts for 5%, the zinc oxide accounts for 5%, the zirconium dioxide accounts for 3%, and the corundum accounts for 2%.

(2) The granularity of the primary processed particle powder is 10 mu m, the whiteness is 38 percent, and the primary processed particle powder is blue-white and silvery-white; wherein the content of impurities is 0.5%.

(3) And further carrying out jet milling on the primary processed powder to obtain fine particle powder, wherein the particle size of the fine particle powder is 5 mu m, and the whiteness is 60%.

(4) The fine particle powder is mixed with a coupling agent, and the fine particle powder comprises 97 parts by mass, 2.2 parts by mass of paraffin, 0.3 part by mass of stearic acid, 0.2 part by mass of aromatic oil, 0.15 part by mass of silane, 0.12 part by mass of titanate and 0.03 part by mass of silane coupling agent Si-69. And then carrying out heating treatment in a rotary kiln, wherein stirring is carried out in the heating treatment at the rotating speed of 1.3/min, the heating temperature of 100 ℃ and the heating time of 40min to obtain the particle powder.

(5) Mixing 12 parts of the particle powder, 88 parts of brominated butyl rubber and butyl reclaimed rubber according to the mass parts to prepare the inner liner of the automobile tire, and further preparing the tire, wherein the tensile strength of the inner liner is 6.5MPa, the breaking elongation is 700 percent, the Shore hardness is 55, and the air permeability coefficient is 1.12 multiplied by 10^-13. The tire was subjected to electron microscope scanning to obtain a microscopic image as shown in fig. 3, in which the white particles in fig. 3 were fine particle powder, and it can be seen from fig. 3 that the fine particle powder had a uniform particle size and was uniformly dispersed in the tire.

Example 4

The present example is a method for producing a fine particle powder, the method comprising the steps of:

(1) and (3) carrying out jaw crushing, air separation and grading on the mica and the ingredients respectively, and then mixing to obtain the primary processing powder. Wherein, in the mixture, by mass percentage, 72% of mica, 8% of black mica, 8% of quartz, 4% of carbon black, 2% of silicon carbide, 2% of zinc oxide, 3% of zirconium dioxide and 1% of corundum.

(2) The granularity of the primary processed particle powder is 70 μm, the whiteness is 62%, and the primary processed particle powder is blue-white and silvery-white; wherein the content of impurities is 0.3%.

(3) And further carrying out jet milling on the primary processed powder to obtain fine particle powder, wherein the particle size of the fine particle powder is 15 mu m, and the whiteness is 90%.

(4) The fine particle powder was mixed with a coupling agent in an amount of 99.5 parts by mass, 0.13 part by mass of paraffin, 0.11 part by mass of stearic acid, 0.05 part by mass of aromatic oil, 0.08 part by mass of silane, 0.11 part by mass of titanate, and 0.02 part by mass of silane coupling agent Si-69. And then carrying out heating treatment in a rotary kiln, wherein stirring is carried out in the heating treatment at the rotating speed of 1.1/min, the heating temperature of 60 ℃ and the heating time of 60min to obtain the particle powder.

(5) Mixing 14 parts of the particle powder, 86 parts of brominated butyl rubber and butyl reclaimed rubber according to parts by weight to prepare the automobile tire air-tight layer, wherein the tensile strength of the air-tight layer is 7.0MPa, the elongation at break is 730 percent, the Shore hardness is 58, and the air permeability coefficient is 1.10 multiplied by 10^-13。

Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.