CN113956688A

CN113956688A - Carbon black and preparation method and application thereof

Info

Publication number: CN113956688A
Application number: CN202111407441.XA
Authority: CN
Inventors: 余本祎; 吕泽满; 林浩晋
Original assignee: Maoming Huanxing New Material Co ltd
Current assignee: Maoming Huanxing New Material Co ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-01-21
Anticipated expiration: 2041-11-24
Also published as: CN113956688B

Abstract

The invention provides carbon black and a preparation method and application thereof, wherein the carbon black particles are distributed into 10-mesh 0-5%, 18-mesh 18-22%, 35-mesh 45-55%, 60-mesh 18-22% and 120-mesh 6-12% by adjusting the flow ratio of a binder to granulating water in terms of mass fraction. The carbon black has the dispersibility up to 10 levels, is not easy to block pipes in the conveying process, has no pocking mark when being applied to rubber products, has smooth surface and improves the mechanical property of the rubber products to a certain extent.

Description

Carbon black and preparation method and application thereof

Technical Field

The invention belongs to the technical field of carbon black, and particularly relates to carbon black and a preparation method and application thereof.

Background

Carbon black, as a reinforcing filler for rubber, is an industrial material second only to raw rubber in the rubber industry, and the consumption thereof in the rubber industry accounts for about 90% or more of the yield thereof.

In the field of rubber industry, carbon black is usually measured to have technical indexes such as particle size (specific surface area), structure degree, surface activity, particle distribution and the like, and the technical indexes can influence the technical processability of rubber and the mechanical properties of final rubber products. Researches find that the distribution of carbon black particles has great influence on rubber process processing. On the other hand, in the production process of rubber products, carbon black is conveyed through a multi-purpose pipeline, a phenomenon of pipe blockage exists in the conveying process, the phenomenon is directly related to particle distribution of the carbon black, and in addition, the rubber products also have the problem of pocking marks in the rubber mixing and forming processes, so that not only is the production efficiency influenced, but also the appearance and the performance of the rubber products are influenced, and the reason is mainly caused by insufficient dispersibility of the carbon black. At present, no technical conditions and control methods exist for solving the problems in the process production process.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the carbon black provided by the invention has the advantages that the dispersibility of the carbon black reaches 10 grades, pipe blockage is not easy to occur in the conveying process, no pocking mark is generated when the carbon black is applied to a rubber product, the surface is smooth, and the mechanical property of the rubber product is improved to a certain extent.

In a second aspect, the present invention provides a process for the preparation of the above carbon black.

A third aspect of the present invention provides a use of the above carbon black.

According to the first aspect of the invention, the carbon black is provided, and the particle distribution of the carbon black is 10 meshes 0-5%, 18 meshes 18-22%, 35 meshes 45-55%, 60 meshes 18-22%, 120 meshes 6-12% in percentage by mass.

In some embodiments of the invention, the carbon black further comprises a binder and granulating water. The binder plays a role in binding in the carbon black granulation process, and the granulation water adjusts the pH in the carbon black granulation process.

In some preferred embodiments of the invention, the binder comprises at least one of lignin, lignin salts, molasses, polyvinyl alcohol, dextrin or starch.

In some more preferred embodiments of the invention, the granulation water comprises at least one of sodium carbonate, sodium hydroxide, potassium carbonate, potassium hydroxide, sodium citrate, potassium citrate, citric acid, sodium hydrogen phosphate, disodium hydrogen phosphate, or sodium monohydrogen phosphate.

According to a second aspect of the present invention, there is provided a method for producing the above carbon black, comprising the steps of:

adding a binder solution and granulating water into carbon black at the same time, granulating and drying to obtain the carbon black, wherein the flow ratio of the binder solution to the granulating water is (0-10): 1; preferably (2-5): 1.

in some embodiments of the present invention, the mass fraction of the binder solution is 0 to 20%.

In some preferred embodiments of the present invention, the granulation water is present in an amount of 0 to 10% by mass.

In some preferred embodiments of the present invention, the flow rate of the granulation water is 0 to 1500 kg/h; preferably, the flow rate of the granulating water is 200kg/h to 700 kg/h.

According to a third aspect of the invention, there is provided the use of a carbon black as described above in rubber.

The invention has the beneficial effects that:

1. the carbon black disclosed by the invention has high dispersibility, the dispersibility level can reach 10 levels, the carbon black is higher than commercially available carbon black, pipe blockage is not easy to occur in the conveying process of the carbon black, the production efficiency is improved, and when the carbon black is applied to rubber products, the surfaces of the products can be smooth without pockmarks.

2. The preparation method of the carbon black can prepare the carbon black with high dispersibility by controlling the flow of the binder solution and the granulating water.

Drawings

The invention is further described with reference to the following figures and examples, in which:

FIG. 1 is a graph showing the dispersion of a commercially available carbon black N234 sample 1 of the present invention in rubber;

FIG. 2 is a graph showing the dispersion of a commercially available carbon black N234 sample 2 of the present invention in rubber;

FIG. 3 is a graph showing the dispersion of carbon black in rubber according to example 1 of the present invention;

FIG. 4 is a graph showing the dispersion of carbon black in rubber according to example 2 of the present invention;

FIG. 5 is a graph showing the dispersion of a commercially available carbon black N550 sample 1 of the present invention in rubber;

FIG. 6 is a graph showing the dispersion of a commercially available carbon black N550 sample 2 of the present invention in rubber;

FIG. 7 is a graph showing the dispersion of carbon black in rubber according to example 3 of the present invention;

FIG. 8 is a graph showing the dispersion of carbon black in rubber in example 4 of the present invention.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.

Examples

This example prepares samples of examples 1 to 4 according to the material composition of table 1:

TABLE 1

Taking example 1 as an example, the preparation method of the carbon black of example 1 comprises the following steps:

in the examples, the mass fractions of the binder and the granulating aqueous solution were each 100 parts.

Respectively adding 1 part of lignin salt, 5 parts of molasses and 3 parts of dextrin into 91 parts of pure water, fully stirring and dissolving uniformly for later use, adding 1 part of potassium hydroxide, 3 parts of sodium citrate and 2.5 parts of citric acid into 93.5 parts of pure water, fully stirring and dissolving uniformly for later use. In the production process of the carbon black, in the granulation link, prepared binder solution and granulation water solution are respectively added into a granulator according to the flow rate of 4.5:1, wherein the granulation water flow rate is 305kg/h, and after granulation is finished, the generated carbon black is dried and packaged.

Other examples were prepared by referring to example 1, except that the binder solution, the components of the granulation water, the flow rate of the granulation water, and the flow rate ratio of the both were different.

Test examples

The product properties of commercially available carbon black N234 sample 1 (commercially available N234 # 1), commercially available carbon black N234 sample 2 (commercially available N234 # 2), commercially available carbon black N550 sample 1 (commercially available N550 # 1), commercially available carbon black N550 sample 2 (commercially available N550 # 2) and the carbon blacks obtained in examples 1 to 4 of the present application were measured in this test example, and the results are shown in table 2:

TABLE 2

Note: the testing methods all adopt national standard methods, and the latest standard is not noted in standard years.

Wherein, the rubber formula and the processing method for testing the Mooney viscosity, the tensile strength, the 300 percent definite elongation and the dispersibility are described in GB/T3780.18-2017.

The dispersibility test results were evaluated for the dispersibility of carbon black in rubber according to GB/T6030-. The results are shown in table 2 and fig. 1 to 8.

As can be seen from Table 2, the technical indexes of the carbon black of the invention all reach the required values of national standard carbon black, the particle distribution is 10 meshes 0-5%, 18 meshes 18-22%, 35 meshes 45-55%, 60 meshes 18-22%, 120 meshes 6-12%, the content of 325 meshes of washing screen residues of the carbon black distributed in the particles is lower than that of the commercially available national standard type carbon black, the Mooney viscosity is lower than that of the commercially available national standard type carbon black, the dispersibility reaches 10 grade and is higher than that of the commercially available national standard type carbon black, so that the carbon black of the invention is easy to disperse and process in rubber, and the mechanical properties of the carbon black of the invention in rubber are improved to a certain extent compared with those of the commercially available carbon black as can be seen from the tensile strength and 300% definite elongation results.

As can be seen from fig. 1 to 4, the carbon black aggregates on the surface of the commercial N234 products # 1 and # 2 are more obvious than those in examples 1 and 2, the size of the carbon black aggregates reflects the degree of dispersion of the carbon black in the rubber, and the larger the aggregates are, the poorer the dispersion is, and the smaller the aggregates are, the better the dispersion is. Similarly, it can be seen from FIG. 5 to FIG. 8 that the dispersivity of the 1# and 2# commercial N550 products is worse than that of the examples 3 and 3, and the standard for evaluating the dispersivity rating is referred to GB/T6030-2006 appendix A.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

Claims

1. A carbon black characterized by: the carbon black particles are distributed by weight percentage of 0-5% of 10 meshes, 18-22% of 18 meshes, 45-55% of 35 meshes, 18-22% of 60 meshes and 6-12% of 120 meshes.

2. The carbon black according to claim 1, characterized in that: the carbon black also includes a binder and granulating water.

3. The carbon black according to claim 1, characterized in that: the binder comprises at least one of lignin, lignin salts, molasses, polyvinyl alcohol, dextrin or starch.

4. The carbon black according to claim 1, characterized in that: the granulation water comprises at least one of sodium carbonate, sodium hydroxide, potassium carbonate, potassium hydroxide, sodium citrate, potassium citrate, citric acid, sodium hydrogen phosphate, disodium hydrogen phosphate or sodium monohydrogen phosphate.

5. A method for producing the carbon black as claimed in claim 1 to 5, comprising the steps of:

adding a binder solution and granulating water into carbon black at the same time, granulating and drying to obtain the carbon black, wherein the flow ratio of the binder solution to the granulating water is (0-10): 1.

6. the method of claim 5, wherein: the flow ratio of the binder solution to the granulating water is (2-5): 1.

7. the method of claim 5, wherein: the mass fraction of the binder solution is 0-20%.

8. The method of claim 5, wherein: the mass fraction of the granulating water is 0-10%.

9. The method of claim 5, wherein: the flow rate of the granulating water is 0-1500 kg/h.

10. Use of the carbon black according to claims 1 to 5 in rubber.