阅读说明：本技术 高分散白炭黑的生产方法 (Production method of high-dispersion white carbon black ) 是由 申志忠 陈忠斌 聂绪建 韩怀见 曹大志 胡琪 曹迎峰 于 2019-10-18 设计创作，主要内容包括：一种高分散白炭黑的生产方法,该方法的特征在于：采用60～70m<Sup>3</Sup>的反应器,在反应底液中加入500～600Kg无机盐类分散剂Na2SO4和含有5～10Kg的溶解性SiO2的溶液,底液中加入分散剂和SiO2的主要作用是提高沉淀二氧化硅一次粒径的均匀度；本发明的技术效果是：制造白炭黑的原料主要是石英砂、纯碱及浓硫酸。原料的品质尤其是纯净度对产品质量产生很大影响,特别是石英砂的质量,泥土等杂质、金属元素含量等不纯物控制不严的话,将对制造的高分散白炭黑产品的一些重要应用性能产生很大影响,有“杂质”的石英砂会影响白炭黑的分散。(A production method of high-dispersion white carbon black is characterized by comprising the following steps: 60-70 m is adopted 3 Adding 500-600 Kg of inorganic salt dispersant Na2SO4 and 5-10 Kg of solution containing soluble SiO2 into a reaction base solution, wherein the dispersant and the SiO2 are added into the base solution to mainly improve the uniformity of the primary particle size of precipitated silica; the invention has the technical effects that: the raw materials for preparing the white carbon black mainly comprise quartz sand, calcined soda and concentrated sulfuric acid. The quality of raw materials, particularly the purity, has great influence on the product quality, particularly, if the quality of quartz sand, impurities such as soil and the like, the content of metal elements and the like are not controlled tightly, the quality has great influence on some important application properties of the manufactured high-dispersion white carbon black product, and the quartz sand with impurities can influence the dispersion of the white carbon black.)

1. A production method of high-dispersion white carbon black is characterized by comprising the following steps:

(1) 60-70 m is adopted³Adding 500-600 Kg of inorganic salt dispersant Na2SO4 and 5-10 Kg of solution containing soluble SiO2 into reaction base liquid, and adding the dispersed dispersant into the base liquidThe main function of the agent and the SiO2 is to improve the uniformity of the primary particle size of the precipitated silica;

(2) in the initial reaction stage, because the particle structure is simple, the initial reaction adopts a lower temperature (70-80 ℃) to enable the particle surface to be easier to form larger and relatively uniform pores (volume), the reaction temperature is gradually increased along with the growth of the particle size of the white carbon black, the reaction is accelerated, the inner and outer layer structures of the white carbon black particles tend to be similar, and CTAB is close to BET, which is the core content of the high-dispersion white carbon black;

(3) in the pulping process, 1-3% of sodium metaaluminate solution is added as a pulping aid according to the thick pulp amount, so that the pulping effect is greatly improved, the pH value can be adjusted and stabilized, and the vulcanizing time of the sizing material is reasonable;

(4) selecting high-quality quartz sand as a raw material, ensuring that the iron content is less than or equal to 120ppm, the liquid sodium silicate is clear and transparent and has no suspended matters, carrying out filtration and purification treatment on reaction water, the sodium silicate and a dispersing agent, and putting the reaction water, the sodium silicate and the dispersing agent into production, wherein the steam pressure is required to be more than or equal to 6.0kg, and the stirring speed of a reaction kettle is increased to 70-90 r/min.

2. The method for producing the high-dispersion white carbon black according to claim 1, which is characterized by comprising the following steps: reation kettle top increases one and strains back hot-water coiled pipe, washing nozzle and automatic solenoid switch valve, and the washing nozzle passes through automatic solenoid switch valve and connects and strain back hot-water coiled pipe, and after the reaction is unloaded, the ooff valve is automatic to be opened and spouts water washing tank wall, through time control ooff valve to prevent that tank wall scabs.

Technical Field

The invention relates to a production method of white carbon black, in particular to a production method of high-dispersion white carbon black.

Background

The high-dispersion white carbon black has excellent dispersibility and good reinforcing effect when being applied to rubber tires, reduces heat generation in the running process of the tires while increasing the wear resistance of the rubber tires, improves the heat aging resistance of the rubber, can obviously reduce the rolling resistance of the tires, and can keep better ice-skid resistance and wet-skid resistance.

The black cat company is the largest carbon black producing enterprise at present in China and also the carbon black producing enterprise ranked fourth in the world, and the black cat company is advancing to the third carbon black company in the world along with the acceleration of the diversification and globalization development steps. The white carbon black is one of the major industrialized directions of the company, the dispersibility of the white carbon black in rubber is improved, and the development of the high-dispersion white carbon black is the technical key of the development of the white carbon black industry, so that the development of the high-dispersion white carbon black technology is imperative, which is also the requirement of the development of the rubber tire manufacturing field, and the white carbon black has great significance for the black cat company to adjust the product structure, improve the economic benefit of enterprises and keep the black cat company to be advanced in the domestic carbon black industry technology.

With the increasing demand for environmental protection, green tires are becoming more and more popular. Under the influence of the EU reach regulation and label regulation, the application of the high-dispersion white carbon black in the tire is more and more emphasized, and the high-dispersion white carbon black has the functions of reducing the rolling resistance and reducing the fuel consumption on the premise of not reducing the wet land holding power, and is environment-friendly and energy-saving. Therefore, the high-dispersion white carbon black is a future development trend of white carbon black products, and the application range is wider and wider. The prior art is disclosed as CNCN104150492B and is named as a production method of high-dispersity white carbon black, triethyl phosphate is used as a dispersing agent, collision among particles cannot be enhanced in the reaction process, and the dispersity of the white carbon black is not ideal enough; the patent publication No. CN106829977A, entitled a preparation method of high oil absorption high dispersion white carbon black, adopts a mode of adding strong electrolyte Na2SO4 and NaCl to form uniform white carbon black particles, and the Na2SO4 and NaCl are added to react mildly, SO that when an ideal effect is obtained, the reaction time must be prolonged, the production efficiency is greatly reduced, and the white carbon black is difficult to be utilized in actual production.

Disclosure of Invention

The invention aims to provide a production method of high-dispersion white carbon black, which solves the problem of poor reinforcing property caused by difficult dispersion of the existing white carbon black in rubber.

The invention is realized in such a way, and the production method of the high-dispersion white carbon black is characterized by comprising the following steps: (1) adding 500-600 Kg of inorganic salt dispersant Na2SO4 and 5-10 Kg of solution containing soluble SiO2 into a reaction base solution by adopting a reactor of 60-70 m3, wherein the dispersant and SiO2 are added into the base solution to mainly improve the uniformity of the primary particle size of precipitated silica;

(2) in the initial reaction stage, because the particle structure is simple, the initial reaction adopts a lower temperature (70-80 ℃) to enable the particle surface to be easier to form larger and relatively uniform pores (volume), the reaction temperature is gradually increased along with the growth of the particle size of the white carbon black, the reaction is accelerated, the inner and outer layer structures of the white carbon black particles tend to be similar, and CTAB is close to BET, which is the core content of the high-dispersion white carbon black;

(3) in the pulping process, 1-3% of sodium metaaluminate solution is added as a pulping aid according to the thick pulp amount, so that the pulping effect is greatly improved, the pH value can be adjusted and stabilized, and the vulcanizing time of the sizing material is reasonable;

(4) selecting high-quality quartz sand as a raw material, ensuring that the iron content is less than or equal to 120ppm, the liquid sodium silicate is clear and transparent and has no suspended matters, performing filtration and purification treatment on reaction water, the sodium silicate and a dispersing agent, and putting the reaction water, the sodium silicate and the dispersing agent into production, wherein the steam pressure is required to be more than or equal to 6.0kg, and the stirring speed of a reaction kettle is increased to 70-90 r/min, so that the materials participating in the reaction kettle are more fully dispersed and mixed, the reaction rate of the generation of the white carbon black and the uniformity of a reaction product are improved, the dispersibility of the white carbon black is.

The reation kettle top increases one and strains back hot-water coiled pipe, washing nozzle and automatic electromagnetic switch valve, and the washing nozzle passes through automatic electromagnetic switch valve and connects and strain back hot-water coiled pipe, and after the reaction is unloaded, the electromagnetic switch valve is automatic to be opened and spouts water washing tank wall, through setting for time parameter control ooff valve, sanitization reation kettle (jar) wall to prevent that the deposit material forms "scab" at the tank wall.

The invention has the technical effects that: the raw materials for preparing the white carbon black mainly comprise quartz sand, calcined soda and concentrated sulfuric acid. The quality of raw materials, particularly the purity, has great influence on the product quality, particularly, if the quality of quartz sand, the contents of impurities such as soil and metal elements and the like are not controlled tightly, the quality has great influence on some important application properties of the manufactured high-dispersion white carbon black product, the quartz sand with impurities can influence the dispersion of white carbon black, the content of copper can influence the aging resistance of the white carbon black sizing material, and when the contents of manganese and iron are high, the white carbon black filling sizing material can be light yellow or generate black spots.

Detailed Description

The invention is realized in such a way that the production method of the high-dispersion white carbon black comprises the following steps: (1) adding 500-600 Kg of inorganic salt dispersant Na2SO4 and 5-10 Kg of solution containing soluble SiO2 into a reaction base solution by adopting a reactor of 60-70 m3, wherein the dispersant and SiO2 are added into the base solution to mainly improve the uniformity of the primary particle size of precipitated silica; (2) in the initial reaction stage, because the particle structure is simple, the initial reaction adopts a lower temperature (70-80 ℃) to enable the particle surface to be easier to form larger and relatively uniform pores (volume), the reaction temperature is gradually increased along with the growth of the particle size of the white carbon black, the reaction is accelerated, the inner and outer layer structures of the white carbon black particles tend to be similar, and CTAB is close to BET, which is the core content of the high-dispersion white carbon black; (3) in the pulping process, 1-3% of sodium metaaluminate solution is added as a pulping aid according to the thick pulp amount, so that the pulping effect is greatly improved, the pH value can be adjusted and stabilized, and the vulcanizing time of the sizing material is reasonable; (4) selecting high-quality quartz sand as a raw material, ensuring that the iron content is less than or equal to 120ppm, the liquid sodium silicate is clear and transparent and has no suspended matters, performing filtration and purification treatment on reaction water, the sodium silicate and a dispersing agent, and putting the reaction water, the sodium silicate and the dispersing agent into production, wherein the steam pressure is required to be more than or equal to 6.0kg, and the stirring speed of a reaction kettle is increased to 70-90 r/min, so that the materials participating in the reaction kettle are more fully dispersed and mixed, the reaction rate of the generation of the white carbon black and the uniformity of a reaction product are improved, the dispersibility of the white carbon black is.

The white carbon black prepared by the method has the main chemical indexes that:

BET:165 103m2/kg	CTAB:116 103m2/kg
		PH:6.5	sodium sulfate content: 1.5 percent
Water content: 7 percent of

The stirring speed of the white carbon black reaction kettle can influence the generation reaction of the white carbon black and the dispersibility of the product, thereby influencing the application performance of the white carbon black in the rubber tire. If the stirring speed of the reaction kettle is not well controlled, the white carbon black generation reaction is not thorough, the gel phenomenon can occur, and the gel in the white carbon black product can greatly reduce the dispersibility of the white carbon black, so that the stirring speed of the white carbon black reaction kettle is improved by the patent technology. In addition to the influence of the raw and auxiliary materials and equipment reasons on the dispersibility of the white carbon black, the 'scabbing' of the accumulated materials on the wall of the reaction kettle can also influence the dispersibility of the white carbon black, so that the physical and chemical properties of the white carbon black can further meet the index requirements by flushing the wall of the reaction kettle with high-temperature water.