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A kind of method for regulating the pH value of carbon black for rubber

A carbon black and rubber technology, applied in the direction of fibrous fillers, etc., can solve the problems of high ash content, easy formation of hard scale, and many impurities in the product, and achieve the effect of mild reaction conditions and simple preparation methods

Active Publication Date: 2022-02-18
LONGXING CHEMICAL STOCK CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Experiments have proved that the effect of using traditional acid or alkali to adjust the pH of carbon black is not good. Adding too much acid will corrode the equipment, and adding a large amount of alkali will cause the ash content of the product to increase. In addition, because the carbon black production line often uses secondary water, Among them, there are many impurities, which are easy to form hard scale in the case of strong alkali, which will cause blockage of pipelines or damage to equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1, using ammonium sulfate, the N326 carbon black with a pH of 9.6 can be reduced to about 8.5; the N134 or N234 carbon black with a pH of 7.2 can be reduced to about 6.0.

[0019] The effect of magnesium sulfate on the pH of carbon black was not as pronounced as that of ammonium sulfate. However, repeated experiments have shown that it has a certain regulatory effect. The analysis principle is that magnesium sulfate has the effect of absorbing free ammonia. It can avoid or weaken the acidification effect of ammonia or ammonium substances on the surface of carbon black.

[0020] 5MgSO 4 +10NH 4 HCO 3 = 4MgCO 3 ·Mg(OH) 2 4H 2 O↓ +6CO 2 ↑+5(NH4) 2 SO 4

[0021] MgSO 4 +NH 3 ·H 2 O=(NH 4 )2SO 4 +Mg(OH) 2 ↓

Embodiment 2

[0022] Example 2, using magnesium sulfate, the N660 carbon black with a pH of 6.5 can be adjusted to about 7.0; or the N660 carbon black with a pH of about 6.3 can be adjusted to about 6.8. Or raise a product with a pH of around 7.0 to around 7.5. The effect is expected to be more pronounced for hard carbon blacks, which are more affected by ammonia.

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Abstract

The invention provides a method for adjusting the pH value of carbon black for rubber, comprising the following steps: in the wet granulation process of carbon black, firstly add ammonium sulfate or magnesium sulfate to the binder solution for granulation, stir to fully dissolve , to obtain the adjustment solution; then pour the adjustment solution into granulation water, and the granulation water is added into the powdery carbon black for granulation and drying. The preparation method of the invention is simple, the reaction conditions are mild, and the pH value of the carbon black for rubber can be accurately adjusted by using ammonium sulfate or magnesium sulfate, and the pH value of the carbon black can be controlled in a relatively narrow range to meet various needs of different customers ; Avoid using strong acid or alkali, avoid corrosion of reaction equipment or increase reaction ash to affect product quality.

Description

technical field [0001] The invention belongs to the technical field of carbon black production, in particular to a method for regulating the pH value of carbon black for rubber. Background technique [0002] The pH value of carbon black is a parameter that expresses the acidity and alkalinity of the surface of carbon black. The pH value of carbon black is mainly affected by the acidity and alkalinity of the chemical groups on the surface of carbon black, the nature of the adhesive, the quality of production water, etc. The pH value of carbon black for rubber is generally required to be 6-10, and some customers require a narrow range, which brings certain difficulties to production control. Experiments have proved that the effect of using traditional acid or alkali to adjust the pH of carbon black is not good. Adding too much acid will corrode the equipment, and adding a large amount of alkali will cause the ash content of the product to increase. In addition, because the ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/48C09C1/58
Inventor 马宝亮刘成友李义彬刘江红万冬冬王磊
Owner LONGXING CHEMICAL STOCK CO LTD
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