Modification method for white carbon black

A white carbon black and modification technology, applied in the field of rubber reinforcing agent, can solve the problems of insufficient reaction of silane coupling agent, slow modification speed, low coverage rate, etc., so as to improve the modification effect of white carbon black, The effect of improving production efficiency and improving reactivity

Active Publication Date: 2020-12-01
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although in-situ modification and dry modification simplify the silica modification process, they have disadvantages such as uneven mixing, slow modification speed, and insufficient reaction of silane coupling agents, and wet modification also has silane coupling. Problems such as low agent utilization rate, complex process, long reaction time, low coating rate, etc.

Method used

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  • Modification method for white carbon black
  • Modification method for white carbon black
  • Modification method for white carbon black

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] see figure 1 , the white carbon black modification method of the present invention, comprises the steps:

[0041] (1) Pre-hydrolysis of silane coupling agent

[0042] According to the molar ratio of water and γ-mercaptopropyltriethoxysilane (KH580) being 1:1, KH580 was configured as a 50% alcohol solution.

[0043] The specific steps are as follows: First, take appropriate amount of ethanol and water according to the ratio, stir for 20 minutes, and then use 4mol·L -1 The pH of the solution was adjusted to 3 with dilute sulfuric acid solution. Accurately weigh KH580 according to the proportion, slowly add it to the beaker, and stir while adding; after the configuration is completed, seal the beaker with a parafilm, and use a magnetic stirrer to continuously stir at 400rpm and 25°C for a period of time. The tester continuously tests the conductivity of the hydrolyzed solution, and determines the degree of hydrolysis of the hydrolyzed solution according to the result of...

Embodiment 2

[0054] see figure 1 , Example 2 of the present invention provides another silica modification method, which differs from the method in Example 1 in that the molar ratios of water and KH580 are 1:2, respectively.

[0055] Has the following steps:

[0056] (1) Pre-hydrolysis of silane coupling agent

[0057] According to the molar ratio of water and KH580 respectively 1:2, configure KH580 into 50% alcohol solution.

[0058] The specific steps are as follows: First, take appropriate amount of ethanol and water according to the ratio, stir for 20 minutes, and then use 4mol·L -1 The pH of the solution was adjusted to 3 with dilute sulfuric acid solution. Accurately weigh KH580 according to the proportion, slowly add it to the beaker, and stir while adding; after the configuration is completed, seal the beaker with a parafilm, and use a magnetic stirrer to continuously stir at 400rpm and 25°C for a period of time. The tester continuously tests the conductivity of the hydrolyzed ...

Embodiment 3

[0069] see figure 1 , Embodiment 3 of the present invention provides another method for modifying silica, which differs from the method in Embodiment 1 in that the molar ratios of water and KH580 are respectively 1:20.

[0070] Has the following steps:

[0071] (1) Pre-hydrolysis of silane coupling agent

[0072] According to the molar ratio of water and KH580 respectively 1:20, configure KH580 into 50% alcohol solution.

[0073] The specific steps are as follows: First, take appropriate amount of ethanol and water according to the ratio, stir for 20 minutes, and then use 4mol·L -1 The pH of the solution was adjusted to 3 with dilute sulfuric acid solution. Accurately weigh KH580 according to the proportion, slowly add it to the beaker, and stir while adding; after the configuration is completed, seal the beaker with a parafilm, and use a magnetic stirrer to continuously stir at 400rpm and 25°C for a period of time. The tester continuously tests the conductivity of the hyd...

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Abstract

The invention belongs to the technical field of rubber reinforcing agents, and discloses a modification method for white carbon black. The modification method comprises the following steps of prehydrolysis of a silane coupling agent, slurry preparation, acid low-temperature adsorption, alkaline high-temperature grafting, and drying. According to the modification method for white carbon black, production efficiency and white carbon black modification effect are greatly improved on the premise of improving the utilization rate and grafting rate of the silane coupling agent.

Description

technical field [0001] The invention relates to the technical field of rubber reinforcing agents, in particular to a method for modifying white carbon black. Background technique [0002] Silica belongs to a kind of amorphous hydrated silica, the internal structure contains part of crystal water, and its molecular formula is SiO 2 ·nH 2 O, density between 2.319-2.653g cm -3 , insoluble in water, but can react with strong bases. The primary particle size of white carbon black is between 10-40nm due to different production processes (precipitation method and gas phase method), and the typical size of aggregates formed by primary particles is 100-200nm. [0003] White carbon black is loose and porous, has a large specific surface area, stable chemical properties, high temperature resistance, excellent flame retardancy and insulation properties, and is widely used in rubber-plastic composite materials, food, coatings, synthetic resins, catalysts and other fields. Due to its ...

Claims

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Application Information

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IPC IPC(8): C08K9/06C08K7/26C09C1/28C09C3/04C09C3/12
CPCC08K7/26C08K9/06C09C1/28C09C3/006C09C3/04C09C3/12
Inventor 张香兰尚志新田萌
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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