CN111004527A - Method for preparing air inhibitor for tire inner liner by using black talc as raw material - Google Patents
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Abstract
The invention discloses a method for preparing an air inhibitor for a tire inner liner by taking black talc as a raw material, belonging to the technical field of fine chemical engineering, and the method for preparing the air inhibitor for the tire inner liner by taking the black talc as the raw material comprises the following steps: the method comprises the following steps: raw ore pretreatment: the raw ore pretreatment comprises two steps of water washing and screening, wherein the water washing is to remove clay impurities attached to the surface of the ore by using a water washing method, and the screening is to manually remove associated minerals such as quartz, calcite, dolomite, magnetite and the like; step two: coarse crushing: crushing the raw ore to 80-200 meshes by using coarse crushing equipment; step three: magnetic separation: the magnetic separator is used for removing particles with high iron content in the coarsely crushed materials, the crushing precision of the crushed black talcum powder can be effectively improved, the dispersity and the rubber matrix affinity of the black talcum powder are improved, and the comprehensive effect of effectively removing associated minerals and heavy metal impurities which are difficult to grind is achieved.
Description
Technical Field
The invention relates to the technical field of fine chemical engineering, in particular to a method for preparing an air inhibitor for a tire inner liner by using black talc as a raw material.
Background
The black talc is one of industrial talcs in China, and a graphene-like lamellar structure exists between molecular layers, so that the black talc is presented. Black talc belongs to a layered magnesium silicate mineral, has a Mohs hardness of only 1-1.5, is chemically stable, and is resistant to high temperature and acid-base corrosion. The black talc mainly comprises talc, quartz, calcite, dolomite and organic carbon, and comprises magnesium oxide, silicon nitride, calcium oxide, aluminum oxide, and small amount of iron oxide, sodium oxide, titanium oxide, etc. China has proved that the reserves of black talc are extremely rich, 6-8 hundred million tons of black talc have been found in China, and 90% of reserves are distributed in Liaoning province, Shandong province, Guangxi province, Hunan province, Jiangxi province, Qinghai province and the like. The physical characteristics of the various provincial talc ores show great differences due to different types, contents and ore forming mechanisms of associated minerals, for example, the blacktalc ores of Shandong tobacco Taiwan and Liaoning Haicheng have pearl luster after being calcined, the blacktalc ores of Jiangxi Guangfeng have poor smoothness but high whiteness after being calcined, the blacktalc ores of Guangxi Shangling have strong smoothness but slightly low whiteness after being calcined, and the talc ores of Hunan Heidel have good flaky structures.
The application range of the black talc is greatly limited due to low whiteness, the black talc is mainly used for producing high-grade ceramics and glaze fabrics by carrying out superfine grinding after high-temperature calcination and whitening, and the product price is 800 plus materials/ton. The utilization method has high energy consumption and low added value of products, and cannot realize full utilization of black talc resources. Therefore, how to find a proper application field according to the physical and chemical characteristics of the black talc ore in different regions and retain the flaky characteristics of the black talc ore through a proper processing means to produce a product with a high aspect ratio is a necessary way for realizing the functional high-added-value green application of the black talc.
In the prior art, the crushing precision of the method for preparing the air inhibitor for the tire inner liner needs to be improved, associated minerals and heavy metal impurities which are difficult to grind are difficult to remove, the product purity is not high, and meanwhile, the dispersibility of the black talcum powder and the affinity of the rubber matrix need to be improved, so that the research and development of the method for preparing the air inhibitor for the tire inner liner by using the black talcum powder as a raw material are urgently needed.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, certain simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above and/or the problems occurring in the conventional method for preparing an air inhibitor for a tire inner liner using black talc as a raw material.
Therefore, the invention aims to provide a method for preparing an air inhibitor for an inner liner of a tire by using black talc as a raw material, which can effectively improve the crushing precision of the crushed black talc, improve the dispersibility and rubber matrix affinity of the black talc and effectively remove associated minerals and heavy metal impurities which are difficult to grind.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
a method for preparing an air inhibitor for a tire inner liner by using black talc as a raw material comprises the following steps:
the method comprises the following steps: raw ore pretreatment: the raw ore pretreatment comprises two steps of water washing and screening, wherein the water washing is to remove clay impurities attached to the surface of the ore by using a water washing method, and the screening is to manually remove associated minerals such as quartz, calcite, dolomite, magnetite and the like;
step two: coarse crushing: crushing the raw ore to 80-200 meshes by using coarse crushing equipment;
step three: magnetic separation: removing particles with higher iron content in the coarsely crushed material by using a magnetic separator;
step four: integration of superfine grinding and modification: carrying out ultrafine grinding on the coarsely ground materials to a certain granularity under the action of a proper auxiliary agent by using grinding and modification integrated equipment;
step five: and (3) post-treatment: and fully mixing the superfine modified material at a certain temperature for a period of time to ensure that the modifier is uniformly coated and reacts completely, and removing residual water in the material.
As a preferable embodiment of the method for preparing the air inhibitor for the tire inner liner from the black talc according to the present invention, wherein: the coarse crushing equipment is a combination of two or more of a jaw crusher, a roller press, a counterattack hammer crusher, a cone crusher, a Raymond mill and a vertical mill.
As a preferable embodiment of the method for preparing the air inhibitor for the tire inner liner from the black talc according to the present invention, wherein: the magnetic field of the magnetic separator can be adjusted, and the iron content of the coarse crushed material is controlled to be 1-0.1%.
As a preferable embodiment of the method for preparing the air inhibitor for the tire inner liner from the black talc according to the present invention, wherein: the main equipment integrating superfine grinding and modification is an airflow kinetic energy mill, 4-8 atomizing nozzles are uniformly distributed at the top of the airflow kinetic energy mill, 1-6 grading machines are arranged at the top of the airflow kinetic energy mill, the rotating speed of the grading machines is adjustable within 4500rpm, so as to control the granularity of the crushed materials, a slag discharge port is formed at the bottom of the airflow kinetic energy mill, associated minerals difficult to crush are discharged, the slag discharge amount of the slag discharge port can be controlled by a high-temperature resistant rotary discharge valve, the pressure of superheated airflow used by the airflow kinetic energy mill is 0.5-1MPa, the temperature is 250-320 ℃, and the temperature in the airflow kinetic energy mill is 180-230 ℃.
As a preferable embodiment of the method for preparing the air inhibitor for the tire inner liner from the black talc according to the present invention, wherein: the auxiliary agent is sprayed from a grinding top through an atomizing nozzle, the dosage of the auxiliary agent is 0.3-1.5% of the total mass of the powder, and the coarsely crushed material is crushed to 1250-5000 meshes under the action of the auxiliary agent.
As a preferable embodiment of the method for preparing the air inhibitor for the tire inner liner from the black talc according to the present invention, wherein: the auxiliary agent is one or more of silane coupling agent, aluminate coupling agent, titanate coupling agent, grinding-aid coupling agent, rare earth coupling agent, alkali metal lipoid acid salt, ammonium polyacrylate, sodium hexametaphosphate and sodium tripolyphosphate.
As a preferable embodiment of the method for preparing the air inhibitor for the tire inner liner from the black talc according to the present invention, wherein: the post-treatment equipment is a high-speed mixer, the post-treatment temperature is 80-120 ℃, and the post-treatment time is 3-15 min.
Compared with the prior art: the method has the advantages that the jet mill is utilized, the dry grinding process is utilized, the materials are ground in a self-impacting and self-rubbing mode at a high temperature, the rapid evaporation of water between layers of the talcum powder is utilized for rapid stripping, the grinding efficiency is high, the energy consumption is low, the sample after grinding is complete in sheet structure, the diameter-thickness ratio is large, the granularity is fine, and the distribution is narrow. Through the crushing and modification integrated process, the black talc is subjected to in-situ composite modification at high temperature, so that the process flow is shortened, the modification effect and the crushing efficiency are greatly improved, and the dual functions of coupling and dispersion are realized. Associated minerals and heavy metal impurities which are difficult to grind are removed by means of magnetic separation and slag discharge processes, and the product purity is improved. The superfine modified black talc powder produced by the process has fineness up to 5000 meshes, lamella thickness up to nano level, average diameter-thickness ratio of about 30-40 and specific surface area up to 14m2Good dispersibility and good affinity with rubber matrix, and can play an excellent role in the tire inner linerGood air tightness and certain reinforcing performance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive exercise. Wherein:
FIG. 1 is a contact angle of a product in embodiment 1 of the present invention;
FIG. 2 is a SEM picture of the product of embodiment 1 of the invention at magnification of 40000 times;
FIG. 3 is a distribution diagram of the aspect ratio of the product in the embodiment 1 of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The invention also provides a preparation method of the air inhibitor for the tire inner liner, which takes the black talc as the raw material and comprises the following steps:
embodiment mode 1
A method for preparing an air inhibitor for an inner liner of a tire by using black talc as a raw material is characterized by comprising the following steps:
(1) raw ore pretreatment: washing the blocky raw ore with water, manually removing associated minerals such as quartz, calcite, dolomite, magnetite and the like, and reserving the raw ore with high talc content and good flaky structure.
(2) Coarse crushing: crushing raw ore to 2-5cm by a jaw crusher, crushing the raw ore to 2-5mm by a roll crusher, and crushing the raw ore to 80 meshes by a Raymond mill.
(3) Magnetic separation: selecting an electromagnetic dry type automatic magnetic separator, and screening the coarsely crushed material under the magnetic field intensity of 12000GS, wherein the content of iron oxide in the magnetically separated material is 0.05%.
(4) Integration of superfine grinding and modification: the coarse material is superfine crushed and modified by an airflow kinetic mill under the working conditions that the rotating speed of a grader is 3200rpm, a slag discharge port is fully opened, the dosage of a silane coupling agent (KH580) is 0.5%, the dosage of sodium polyacrylate is 0.2%, and the dosage of an aluminate coupling agent is 0.3%.
(5) And (3) post-treatment: processing the superfine crushed and modified materials for 8min at the rotating speed of 1500rpm of a high-speed mixer and the temperature of 110 ℃.
After the post-treatment is finished, the powder material is thrown into a finished product bin, and the finished product bin is packaged by an automatic packaging machine to obtain the tire
TABLE 1 table of physicochemical Properties of the products
Using the product prepared in example 1, air tightness tests were carried out in bromobutyl rubber at different air blocking agent dosages.
The rubber formula is as follows: brominated butyl rubber (100 parts), stearic acid (1 part), naphthenic oil V700 (9 parts), sulfur (1 part), zinc oxide (3.5 parts), accelerator DM (1.3 parts), homogenizing agent (7 parts), resin (4 parts), air inhibitor (30, 40, 50 and 60 parts). The raw materials in the formula are sequentially added into an internal mixer to be uniformly mixed by adopting a 1-stage mixing process, then a triangular bag is formed in an open mill for 3 times, the mixture is thinly passed for 3 times, the mixture is placed for 6 hours, a flat vulcanizing instrument is used for vulcanizing for 20 minutes under the pressure of 15MPa, and the airtightness is tested after the mixture is placed for 24 hours after vulcanization molding. The sample airtightness is shown in table 2.
TABLE 2 air inhibitor dosage vs. air permeability relationship table for bromobutyl rubber
| Amount (parts) of retarder | 0 | 30 | 40 | 50 | 60 |
| Air permeability Q (× 10-17) m/Pa · S | 0.23 | 0.165 | 0.159 | 0.152 | 0.149 |
| Relative air permeability RP | 1 | 0.72 | 0.69 | 0.66 | 0.65 |
The product prepared in embodiment 1 was used for air tightness tests in styrene butadiene rubber at different air inhibitor dosages. The rubber formula is as follows: styrene butadiene rubber (100 parts), stearic acid (1 part), sulfur (1.75 parts), zinc oxide (3 parts), accelerator NS (1 part), and air inhibitor (30, 40, 50, and 60 parts). The raw materials in the formula are sequentially added into an internal mixer to be uniformly mixed by adopting a 1-stage mixing process, then a triangular bag is formed in an open mill for 3 times, the mixture is thinly passed for 3 times, the mixture is placed for 6 hours, a flat vulcanizing instrument is used for vulcanizing for 17 minutes under the pressure of 15MPa, and the airtightness is tested after the mixture is placed for 24 hours after vulcanization molding. The sample airtightness is shown in table 3.
TABLE 3 relationship table between air inhibitor amount and air permeability in styrene butadiene rubber
| Amount (parts) of |
0 | 30 | 40 | 50 | 60 |
| Air permeability Q (× 10-17) m/Pa · S | 11.46 | 7.31 | 6.22 | 5.32 | 4.87 |
| Relative air permeability RP | 1 | 0.64 | 0.54 | 0.46 | 0.42 |
By combining the above embodiments, the method for preparing the air inhibitor for the tire inner liner by using the black talc as the raw material can effectively improve the crushing precision of the crushed black talc, improve the dispersibility and the rubber matrix affinity of the black talc, effectively remove associated minerals and heavy metal impurities which are difficult to grind, and have good economic benefits.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination as long as there is no structural conflict, and the combination is not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. A method for preparing an air inhibitor for a tire inner liner by using black talc as a raw material is characterized by comprising the following steps: the method for preparing the air inhibitor for the tire inner liner by taking the black talc as the raw material comprises the following steps:
the method comprises the following steps: raw ore pretreatment: the raw ore pretreatment comprises two steps of water washing and screening, wherein the water washing is to remove clay impurities attached to the surface of the ore by using a water washing method, and the screening is to manually remove associated minerals such as quartz, calcite, dolomite, magnetite and the like;
step two: coarse crushing: crushing the raw ore to 80-200 meshes by using coarse crushing equipment;
step three: magnetic separation: removing particles with higher iron content in the coarsely crushed material by using a magnetic separator;
step four: integration of superfine grinding and modification: carrying out ultrafine grinding on the coarsely ground materials to a certain granularity under the action of a proper auxiliary agent by using grinding and modification integrated equipment;
step five: and (3) post-treatment: and fully mixing the superfine modified material at a certain temperature for a period of time to ensure that the modifier is uniformly coated and reacts completely, and removing residual water in the material.
2. The method for preparing the air inhibitor for the tire inner liner from black talc as the raw material according to claim 1, wherein the method comprises the following steps: the coarse crushing equipment is a combination of two or more of a jaw crusher, a roller press, a back-beating hammer crusher, a cone crusher, a Raymond mill and a vertical mill.
3. The method for preparing the air inhibitor for the tire inner liner from black talc as the raw material according to claim 1, wherein the method comprises the following steps: the magnetic field of the magnetic separator can be adjusted, and the iron content of the coarse crushed material is controlled to be 1-0.1%.
4. The method for preparing the air inhibitor for the tire inner liner from black talc as the raw material according to claim 1, wherein the method comprises the following steps: the main equipment integrating superfine grinding and modification is an air flow kinetic energy mill, 4-8 atomizing nozzles are uniformly distributed at the top of the air flow kinetic energy mill, 1-6 graders are arranged at the top of the air flow kinetic energy mill, the rotating speed of the graders can be adjusted within 4500rpm to control the granularity of the crushed materials, a slag discharge port is arranged at the bottom of the air flow kinetic energy mill to discharge associated minerals difficult to crush, the slag discharge amount of the slag discharge port can be controlled by a high-temperature resistant rotary discharge valve, the pressure of superheated air flow used by the air flow kinetic energy mill is 0.5-1MPa, the temperature is 250-320 ℃, and the temperature in the air flow kinetic energy mill is 180-230 ℃.
5. The method for preparing the air inhibitor for the tire inner liner from black talc as the raw material according to claim 1, wherein the method comprises the following steps: the auxiliary agent is sprayed from a grinding top through an atomizing nozzle, the dosage of the auxiliary agent is 0.3-1.5% of the total mass of the powder, and the coarsely crushed material is crushed to 1250-5000 meshes under the action of the auxiliary agent.
6. The method for preparing the air inhibitor for the tire inner liner from black talc as the raw material according to claim 1, wherein the method comprises the following steps: the auxiliary agent is one or more of silane coupling agent, aluminate coupling agent, titanate coupling agent, grinding-assisted coupling agent, rare earth coupling agent, alkali metal lipoid acid salt, ammonium polyacrylate, sodium hexametaphosphate and sodium tripolyphosphate.
7. The method for preparing the air inhibitor for the tire inner liner from black talc as the raw material according to claim 1, wherein the method comprises the following steps: the post-treatment equipment is a high-speed mixer, the post-treatment temperature is 80-120 ℃, and the post-treatment time is 3-15 min.
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