Bio-based comb-structure carbon black dispersing agent as well as preparation method and application thereof

Abstract

The invention discloses a bio-based comb-structure carbon black dispersing agent as well as a preparation method and application thereof. The bio-based comb-structure carbon black dispersing agent is prepared by heating, stirring and uniformly mixing PEG and a bio-based raw material, the molecular weight of PEG (polyethylene glycol) is between 1000g / mol and 6000 g / mol; the bio-based raw material is one or more of serine, cysteine, asparagine, glutamine, threonine, phenylalanine, tryptophan and tyrosine. The bio-based comb-structure carbon black dispersing agent disclosed by the invention can obviously improve the dispersity of carbon black while ensuring that rubber has better vulcanization characteristics, thereby improving the physical and mechanical properties of rubber products.

Description

Technical Field

[0001] The invention relates to the technical field of rubber production, and in particular to a bio-based comb-structured carbon black dispersant and a preparation method and application thereof. Background Art

[0002] In order to improve the mechanical strength and wear resistance of rubber, it is usually necessary to add a certain amount of carbon black to the rubber. The dispersion and uniformity of carbon black in the rubber directly affect the processing performance and physical and mechanical properties of the rubber. Due to the special surface properties of carbon black, it is difficult to disperse evenly in the rubber, which affects its dispersion effect in the rubber and further affects the various mechanical properties of the rubber. Therefore, some dispersants are added.

[0003] However, since traditional dispersants are fatty acid soaps or surfactants, they are reactive and can easily cause scorching and extend the vulcanization time if used improperly, which can reduce processing safety, increase the proportion of dead materials, insufficient vulcanization, and reduce the mechanical properties of rubber products. Therefore, this type of dispersant can easily cause disadvantages such as low mechanical strength of rubber products.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a bio-based comb-structured carbon black dispersant, which can significantly improve the dispersibility of carbon black while ensuring that the rubber has good vulcanization characteristics, thereby improving the physical and mechanical properties of rubber products.

[0006] The technical solution of the present invention is described in detail as follows: In a first aspect, the present invention provides a bio-based comb-structured carbon black dispersant, which is prepared by heating, stirring and mixing PEG and a bio-based raw material; The PEG molecular weight is between 1000 g / mol and 6000 g / mol; The bio-based raw material is one or more of serine, cysteine, asparagine, glutamine, threonine, phenylalanine, tryptophan and tyrosine.

[0007] Optionally or preferably, in the above-mentioned bio-based comb-structured carbon black dispersant, the mass ratio of PEG to the bio-based raw material is 60~70:40~30.

[0008] Optionally or preferably, in the above-mentioned bio-based comb-structured carbon black dispersant, the PEG is one or more of a molecular weight of 1000 g / mol, a molecular weight of 2000 g / mol, a molecular weight of 4000 g / mol, and a molecular weight of 6000 g / mol.

[0009] In a second aspect, the present invention provides a method for preparing any of the above-mentioned bio-based comb-structured carbon black dispersants, which comprises first heating PEG to a molten state, then cooling to room temperature, adding the bio-based raw material, and stirring at a constant speed at room temperature until uniform.

[0010] Optionally or preferably, in the preparation method, the heating temperature is 60°C~100°C.

[0011] Optionally or preferably, in the preparation method, the stirring rate is 50 r / min ~100 r / min.

[0012] Optionally or preferably, in the preparation method, the stirring time is 30 min to 60 min.

[0013] In a third aspect, the present invention provides the use of any of the above-mentioned bio-based comb-structured carbon black dispersants in the preparation of rubber products.

[0014] In a fourth aspect, the present invention provides a rubber product comprising any of the above-mentioned bio-based comb-structured carbon black dispersants.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The bio-based comb-structured carbon black dispersant provided by the present invention has simple ingredients, an easy-to-operate preparation method, mild preparation conditions, and good compatibility with raw rubber. The bio-based comb-structured carbon black dispersant, the bio-based raw materials used contain polar functional groups and hydroxyl groups, and PEG also contains polar functional groups and hydroxyl groups, which can significantly improve the dispersibility of the product and can form a three-dimensional comb-like structure (such as Figure 1 As shown in the figure), during the refining process, it plays a "wetting and dispersing" role on carbon black, reducing the particle size of carbon black and improving the dispersibility of carbon black in the rubber compound.

[0016] The bio-based comb-structured carbon black dispersant provided by the present invention can ensure that the vulcanized rubber further prepared by using the carbon black dispersant rubber has good vulcanization characteristics, and can also significantly improve the dispersibility of carbon black, thereby improving the mechanical properties of rubber products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the dispersing effect of the bio-based comb-structured carbon black dispersant of the present invention on carbon black.

[0018] Figure 2 These are the test results of carbon black dispersion in the rubber obtained by adding the carbon black dispersant of Examples 1-3 and Comparative Example 1. DETAILED DESCRIPTION

[0019] In order to make the technical personnel in this field better understand the present application scheme, the present application will be clearly and completely described below in conjunction with the embodiments and drawings. Obviously, the described embodiments are only embodiments of a part of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should belong to the scope of protection of this application. The instruments and reagents used in the embodiments are all derived from commercial channels unless otherwise specified.

[0020] Example 1 60g of PEG with a molecular weight of 4000g / mol is placed in a reaction flask and heated to 80°C. Stirring can be performed during the heating process, and the stirring speed is maintained at 60r / min. After the PEG becomes molten, it is cooled to room temperature, 40g of serine is added, and constant stirring is performed at 60r / min at room temperature for 45min. After the stirring is completed, the temperature is lowered, and filtering can be performed if necessary to obtain a bio-based comb-structured carbon black dispersant product. The product is in a solid-liquid mixed state, and becomes a complete solid after cooling, and is then used for granulation to make a finished product.

[0021] Example 2 Place 65g of PEG with a molecular weight of 4000g / mol in a reaction flask, heat to 80°C, and stir at a speed of 60r / min; after the PEG becomes molten, cool to room temperature, add 35g of serine, and stir at a constant speed of 60r / min at room temperature for 45min; after the end, cool and filter the material to obtain a bio-based comb-structured carbon black dispersant product.

[0022] Example 3 70 g of PEG with a molecular weight of 4000 g / mol was placed in a reaction flask, heated to 80°C, and stirred at a speed of 60 r / min; after the PEG became molten, it was cooled to room temperature, 30 g of serine was added, and stirred at a constant speed of 60 r / min at room temperature for 45 minutes; after the end, the temperature was cooled and the material was filtered to obtain a bio-based comb-structured carbon black dispersant product.

[0023] Comparative Example 1 Commercially available carbon black dispersants.

[0024] The carbon black dispersant products of the above-mentioned Examples 1-3 and Comparative Example 1 were used as fillers and combined with other rubber raw materials to prepare rubber products by conventional methods. The raw material formula of the rubber products and the amounts of different raw materials are shown in Table 1 below: Table 1, Raw materials and usage (mass) of different rubber products The carbon black dispersion tester was used to analyze the dispersion of carbon black in the four different rubber products. The results are as follows: Figure 2As shown in Table 2, it can be seen from the test results that the addition of the carbon black dispersant of Example 1, Example 2, and Example 3 has a better effect of dispersing carbon black than the addition of the carbon black dispersant of Comparative Example 1.

[0025] Table 2 Dispersion test results of carbon black in four groups of different rubber products The four groups of rubber products were subjected to dynamic performance test and analysis using a dynamic mechanical analyzer. The analysis results are shown in Table 3 below: Table 3 Dynamic performance test results of rubber products prepared with different carbon black dispersants It can be seen from the test results that the rubber products prepared by adding the carbon black dispersant of Examples 1-3 have better tensile strength and elongation at break before aging than the rubber products prepared by adding the carbon black dispersant of Comparative Example 1, and the elongation at break and tensile strength of Examples 1-3 after aging are higher than those of Comparative Example 1.

[0026] The Tanδ values ​​in the low rolling resistance at 60°C are lower in Examples 1-3 than in Comparative Example 1, indicating that the bio-based comb-structured carbon black dispersant can impart lower rolling resistance to the vulcanized rubber.

[0027] After aging, it is equivalent to the control example, and the overall mechanical properties do not change much compared with the control example.

[0028] Table 4 Vulcanization properties of rubber products prepared with different carbon black dispersants Table 4 shows the vulcanization properties of rubber products prepared with different carbon black dispersants. Ts2 represents the scorch time. The longer the time, the higher the processing safety. The scorch time in Examples 1-3 is longer than that in Comparative Example 1, indicating that the addition of this bio-based comb-structured carbon black dispersant can give the rubber compound better processing safety and avoid early vulcanization and dead material. The higher the MH, the higher the vulcanization of the rubber compound. The MH in Examples 1-3 is higher than that in Comparative Example 1, indicating that the addition of the bio-based carbon black dispersant can improve the vulcanization degree of the rubber compound.

[0029] The invention concept is described in detail using specific examples herein, and the description of the above embodiments is only used to help understand the core idea of ​​the invention. It should be pointed out that any obvious modification, equivalent substitution or other improvement made by a person of ordinary skill in the art without departing from the invention concept should be included in the protection scope of the present invention.

Claims

1. A bio-based comb-structured carbon black dispersant, characterized in that: It is made by heating and stirring PEG and bio-based raw materials; The PEG molecular weight is between 1000 g / mol and 6000 g / mol; The bio-based raw material is one or more of serine, cysteine, asparagine, glutamine, threonine, phenylalanine, tryptophan and tyrosine.

2. The bio-based comb-structured carbon black dispersant according to claim 1, characterized in that: The mass ratio of PEG to bio-based raw materials is 60~70:40~30.

3. The bio-based comb-structured carbon black dispersant according to claim 1, characterized in that: The PEG has a molecular weight of 1000 g / mol, a molecular weight of 2000 g / mol, a molecular weight of 4000 g / mol, and a molecular weight of 6000 g / mol, or more.

4. The method for preparing the bio-based comb-structured carbon black dispersant according to any one of claims 1 to 3, characterized in that: First, heat PEG to a molten state, then cool to room temperature, add the bio-based raw materials, and stir at a constant speed at room temperature until uniform.

5. The preparation method according to claim 4, characterized in that: The heating temperature is 60°C to 100°C.

6. The preparation method according to claim 4, characterized in that: The stirring rate is 50 r / min to 100 r / min.

7. The preparation method according to claim 4, characterized in that: The stirring time is 30 min to 60 min.

8. Use of the bio-based comb-structured carbon black dispersant according to any one of claims 1 to 3 in the preparation of rubber products.

9. A rubber product, characterized in that: A bio-based comb-structured carbon black dispersant comprising any one of claims 1 to 3.

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