A rubber accelerator dispersion and its preparation method

Abstract

This invention discloses a rubber accelerator dispersion, its preparation method, and its application, belonging to the field of rubber materials technology. The dispersion comprises the following components in parts by weight: 30-70 parts rubber accelerator, 0.5-7 parts dispersant, 0.01-2 parts penetrant, 0.05-3 parts sodium butylnaphthalene sulfonate, 0.02-1 part polyol, 0.1-5 parts suspending agent, and 12-70 parts water; the dispersant is at least one selected from the following: formaldehyde condensate of methylnaphthalene sulfonate, formaldehyde condensate of naphthalene sulfonate, formaldehyde condensate of benzylnaphthalene sulfonate, and formaldehyde condensate of alkylbenzene sulfonate. The rubber accelerator dispersion provided by this invention is not prone to sedimentation or caking, can be stored for a long time, and is suitable for application in the field of rubber materials; this dispersion, formulated with dispersant, penetrant, sodium butylnaphthalene sulfonate, polyol, and suspending agent, combined with a special pre-dispersion and grinding process, does not exhibit significant heating and thickening phenomena, greatly improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of rubber materials technology, and in particular to a rubber accelerator dispersion and its preparation method. Background Technology

[0002] In the production of impregnated rubber and latex products, rubber accelerators are indispensable. They activate the vulcanizing agent in the rubber compound, thereby accelerating the cross-linking reaction between the vulcanizing agent and rubber molecules, shortening the vulcanization time and lowering the vulcanization temperature. These raw materials are all powdered or granular solids. Since impregnated products are produced by impregnating liquid rubber latex, these raw materials must be dispersed into a liquid suspension before being added to the latex system for production. Currently, the dispersion methods for various solid raw materials are primarily based on grinding. The main steps are: mixing solid powder particles with water and a dispersant, then adding the mixture to a grinding mill; adding a certain volume of spherical grinding media, such as ceramic balls or zirconia balls; during grinding, the grinding media, as the machine rotates, rubs and impacts the solid raw materials, breaking the particles into extremely fine microparticles and dispersing them into the aqueous system; after grinding for a certain period, an aqueous dispersion suspension of these raw materials is obtained. Some rubber raw materials are relatively easy to grind, such as sulfur used as a rubber vulcanizing agent, zinc oxide used as a rubber activator, and titanium dioxide used as a colorant. However, many raw materials, especially rubber accelerators, are very difficult to grind. During the grinding process, heat generation and thickening can easily occur, making it impossible to continue the process and forcing its interruption. Moreover, if the dispersion prepared after grinding is left to stand, it often settles and separates, or even completely precipitates and hardens at the bottom of the container, rendering the dispersion unusable.

[0003] Currently available conventional grinding formulations and processes cannot solve the above-mentioned grinding problems of rubber accelerators. Therefore, it is essential to develop a rubber accelerator dispersion that can be applied to a simple process, so that the preparation of the dispersion does not cause heating and thickening, does not lead to grinding interruption, and the ground dispersion is not prone to sedimentation or caking, and can be stored for a long time. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a rubber accelerator dispersion that is not prone to settling or caking, can be stored for a long time, and is suitable for use in the field of rubber materials. The components of this dispersion are compounded with specific dispersants, penetrants, sodium butylnaphthalene sulfonate, polyols and suspending agents, and combined with special pre-dispersion and grinding processes, so that there is no obvious heating and thickening phenomenon, which greatly improves production efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A rubber accelerator dispersion comprises the following components in parts by weight: 30-70 parts rubber accelerator, 0.5-7 parts dispersant, 0.01-2 parts penetrant, 0.05-3 parts sodium butylnaphthalene sulfonate, 0.02-1 part polyol, 0.1-5 parts suspending agent, and 12-70 parts water; wherein the dispersant is at least one selected from the following: formaldehyde condensate of methylnaphthalene sulfonate, formaldehyde condensate of naphthalene sulfonate, formaldehyde condensate of benzylnaphthalene sulfonate, and formaldehyde condensate of alkylbenzene sulfonate.

[0007] This invention uses a compound of dispersant, penetrant, sodium butylnaphthalene sulfonate, polyol and suspending agent to promote uniform dispersion of rubber accelerator in water. During the preparation of the dispersion, the grinding process will not be interrupted due to heating and thickening. The prepared dispersion is not easy to settle or precipitate and can be stored for a long time. Moreover, the dispersion of this invention has a high content of rubber accelerator, making it suitable for use in the field of rubber materials.

[0008] Studies have shown that without the addition of a dispersant, rubber accelerators cannot be suspended and dispersed evenly in water. Under the premise that other components of the rubber accelerator dispersion remain unchanged, the weight of the dispersant needs to be controlled within 0.5 to 7 parts. If the weight of the dispersant is less than 0.5 parts, the rubber accelerator dispersion is prone to sedimentation, stratification, or even caking.

[0009] Furthermore, the sodium butylnaphthalene sulfonate selected in this invention has both dispersing and penetrating effects, and can work synergistically with dispersants and penetrants to improve the dispersibility and permeability of the dispersion.

[0010] In a preferred embodiment of the present invention, the rubber accelerator is selected from at least one of 3,4,5,6-tetrahydro-2-pyrimidinylthiol, zinc dibutyldithiocarbamate, N,N'-diphenylthiourea, 1,3-diphenylguanidine, and bispentylthiuram tetrasulfide.

[0011] Furthermore, the rubber accelerator is 3,4,5,6-tetrahydro-2-pyrimidinethiol.

[0012] 3,4,5,6-Tetrahydro-2-pyrimidinethiol, also known as accelerator PUR, is an environmentally friendly and pollution-free accelerator, but it is also a raw material that is difficult to grind and disperse. In existing dispersion and grinding processes, the dispersion of this accelerator PUR generates a large amount of heat, causing the dispersion temperature to rise rapidly and resulting in thickening. As the degree of heating and thickening intensifies, the viscosity of the dispersion increases sharply, and the resistance experienced by the grinding media in the mill becomes increasingly greater. When the viscosity rises to a certain level, the grinding media is completely suspended in the dispersion. At this point, the grinding media no longer generate friction and impact with the accelerator PUR raw material particles, losing its grinding effect. Eventually, the entire dispersion may even become a viscous paste, completely unusable, and must be discarded. To mitigate the heating and thickening phenomenon during grinding and prevent serious waste caused by material spoilage, existing technologies often reduce the content of accelerator PUR in the grinding material formulation and increase the amount of water to reduce the degree of heating and thickening during grinding. For example, reducing the content of accelerator PUR in the grinding powder formulation to 10-20 parts results in a very low PUR content, significantly reducing the frequency of noticeable heating and thickening during grinding. However, the resulting dispersion has a lower effective PUR content, requiring multiple grinding processes to achieve the same amount of PUR, increasing production costs. Furthermore, the reduced effective PUR content and increased water content make the prepared dispersion highly susceptible to sedimentation and stratification, sometimes even completely settling and hardening at the bottom of the container, rendering it unusable and resulting in significant waste.

[0013] Compared with the prior art, the present invention, by adding dispersants, penetrants, sodium butylnaphthalene sulfonate, polyols and suspending agents, ensures that the high-content PUR accelerator dispersion does not exhibit significant thickening and heating during stirring, dispersion and grinding. The prepared dispersion contains uniformly dispersed PUR accelerator, is not prone to sedimentation, and can be stored for a long time.

[0014] In a preferred embodiment of the present invention, the rubber accelerator dispersion comprises the following components in parts by weight: 45-65 parts rubber accelerator, 0.8-4 parts dispersant, 0.1-1 part penetrant, 0.1-0.6 parts sodium butylnaphthalene sulfonate, 0.05-0.2 parts polyol, 0.5-2 parts suspending agent, and 29.9-52.05 parts water. When the amounts of each component meet the above conditions, the rubber accelerator can be rapidly dispersed in water, and no significant heating and thickening phenomenon occurs during grinding. Moreover, the rubber accelerator dispersion does not easily settle, and even after long-term standing, the rubber accelerator in the dispersion will not deposit and clump, allowing for long-term preservation.

[0015] Furthermore, in the rubber accelerator dispersion, the rubber accelerator comprises 55 parts by weight, the dispersant comprises 1 to 3 parts by weight, and the penetrant comprises 0.1 to 0.5 parts by weight. When the amounts of rubber accelerator, dispersant, and penetrant meet the above conditions, the grinding and dispersion time of the rubber accelerator can be greatly shortened.

[0016] As a preferred embodiment of the present invention, at least one of the following (I) to (IV) is provided:

[0017] (I) The dispersant is a formaldehyde condensate of methylnaphthalene sulfonate;

[0018] (II) The penetrant is selected from at least one of polyethylene glycol p-isooctylphenyl ether and fatty alcohol polyoxyethylene ether penetrants;

[0019] (III) The polyol is selected from at least one of polyethylene glycol, polypropylene glycol and polybutanediol;

[0020] (IV) The suspending agent is selected from at least one of magnesium aluminum silicate, mica powder, talc powder, and kaolinite powder.

[0021] Compared to other dispersants, the formaldehyde condensate of methylnaphthalene sulfonate exhibits better diffusion and stability. The polyol selected in this invention possesses both dispersing and suspending properties; it can not only synergistically work with dispersants to increase the flowability and dispersibility of materials during grinding, but also synergistically work with suspending agents to prevent particle aggregation and sedimentation, thereby improving the suspension stability of the dispersion.

[0022] Secondly, the present invention provides a method for preparing a rubber accelerator dispersion as described in the first aspect, comprising the following steps:

[0023] (1) Mix water, dispersant, penetrant, sodium butylnaphthalene sulfonate, polyol and suspending agent, add rubber accelerator to obtain pre-dispersed material;

[0024] (2) Grind the pre-dispersed material obtained in step (1) to obtain a rubber accelerator dispersion.

[0025] In this invention, water, dispersant, penetrant, sodium butylnaphthalene sulfonate, polyol and suspending agent are pre-stirred and dispersed evenly to form a liquid with good dispersion, wetting and penetrability; then rubber accelerator is added. This order of addition makes it easier and more complete for the rubber accelerator to disperse in the water.

[0026] As a preferred embodiment of the present invention, the method includes: adding water, dispersant, penetrant, sodium butylnaphthalene sulfonate, polyol and suspending agent into a disperser and stirring and mixing, adding rubber accelerator, wherein the addition rate of rubber accelerator does not exceed 300 g / (min·L), and then continuing to stir and disperse for 30~60 min to obtain pre-dispersed material.

[0027] Furthermore, in step (1), the speed of the disperser is 600~1800 r / min.

[0028] In a preferred embodiment of the present invention, the addition rate of the rubber accelerator in step (1) does not exceed 300 g / (min·L). When the addition rate of the rubber accelerator does not exceed 300 g / (min·L), no obvious heating and thickening phenomenon will occur.

[0029] In this invention, the addition rate of the rubber accelerator is no more than 300 g / (min·L), which means that no more than 300 g of rubber accelerator is added per minute for every 1 L capacity of the disperser.

[0030] In a preferred embodiment of the present invention, step (2) involves transferring the pre-dispersed material into a grinding mill for grinding, wherein the grinding speed is 300~800 r / min and the time is 8~20 min.

[0031] In a preferred embodiment of the present invention, the grinding medium in step (2) is a glass bead or a zirconia bead, and the diameter of the grinding medium is 0.2~1.2 mm.

[0032] Furthermore, the grinding media accounts for 40-60% of the capacity of the grinding mill, and the grinding media comprises the following components by volume percentage: grinding media A 30-50%, grinding media B 20-40%, and grinding media C 10-50%. The diameter of grinding media A is 0.2-0.4 mm; the diameter of grinding media B is 0.6-0.8 mm; and the diameter of grinding media C is 1.0-1.2 mm. When the grinding media meets the above conditions, the particle size distribution of the ground dispersion is uniform, and no caking occurs after long-term standing.

[0033] Thirdly, the present invention provides the application of a rubber accelerator dispersion as described in the first aspect in the preparation of rubber materials.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] The rubber-promoting dispersion provided by this invention is not prone to sedimentation or caking, and can be stored for a long time, making it suitable for application in the field of rubber materials. The components of this dispersion are compounded with specific dispersants, penetrants, sodium butylnaphthalene sulfonate, polyols and suspending agents, and combined with special pre-dispersion and grinding processes, so that there is no obvious heating and thickening phenomenon, which greatly improves production efficiency. Detailed Implementation

[0036] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0037] The materials used in the examples and comparative examples are all commercially available products.

[0038] The chemical formula of dispersant MF is C 23 H 18 O6S2Na2 is a formaldehyde condensate of methylnaphthalene sulfonate.

[0039] The chemical formula of dispersant NNO is C 11 H9NaO4S belongs to the formaldehyde condensate of naphthalene sulfonate.

[0040] Dispersant SS is an alkylbenzene sulfonic acid formaldehyde condensate;

[0041] The accelerator PUR is 3,4,5,6-tetrahydro-2-pyrimidinethiol;

[0042] The accelerator ZDBC is zinc dibutyldithiocarbamate;

[0043] The accelerator DPTU is N,N'-diphenylthiourea;

[0044] The accelerator DPG is 1,3-diphenylguanidine;

[0045] The accelerator DPTT is bis(pentyl)thiuram tetrasulfide;

[0046] The penetrant Triton X-100 is polyethylene glycol p-isooctylphenyl ether;

[0047] The penetrant JFC-S belongs to fatty alcohol polyoxyethylene ether;

[0048] The penetrant JFC-E is an isomeric deca-ol polyoxyethylene ether.

[0049] Example 1

[0050] One embodiment of the rubber-promoting dispersion of the present invention is shown in Table 1, and the preparation method is as follows:

[0051] (1) Add water, dispersant, penetrant, sodium butylnaphthalene sulfonate, polyol and suspending agent to the disperser and stir to disperse evenly. Then, under stirring conditions, add rubber accelerator to the disperser at a rate of 20 g / min·L and continue stirring and dispersing for 50 min to obtain pre-dispersed material.

[0052] When stirring in step (1), the speed of the disperser is 1000 r / min;

[0053] (2) The pre-dispersed material obtained in step (1) is transferred to a sand mill for grinding to obtain a rubber accelerator dispersion;

[0054] In step (2), the sand mill is filled with grinding media, which accounts for 50% of the capacity of the sand mill. The grinding media consists of the following components by volume percentage: 40% zirconia balls with a diameter of 0.4 mm, 20% zirconia balls with a diameter of 0.8 mm, and 40% zirconia balls with a diameter of 1.2 mm. The grinding speed is 500 r / min and the time is 12 min.

[0055] Examples 2-16

[0056] The formulations of the rubber-promoting dispersions described in this invention, specifically Examples 2 to 16, are shown in Table 1, and the preparation methods are the same as those in Example 1.

[0057] Table 1

[0058]

[0059] Examples 17-25

[0060] The differences between Examples 17-25 of the rubber-promoting dispersion of the present invention and Example 1 are as follows:

[0061] The dispersant used in Example 17 was dispersant NNO;

[0062] The dispersant used in Example 18 was dispersant SS;

[0063] The rubber accelerator used in Example 19 is accelerator ZDBC;

[0064] The rubber accelerator used in Example 20 is DPTU accelerator;

[0065] The rubber accelerator used in Example 21 is DPG.

[0066] The rubber accelerator used in Example 22 is DPTT accelerator;

[0067] The penetrant used in Example 23 is penetrant JFC-S;

[0068] The penetrant used in Example 24 was penetrant JFC-E;

[0069] The suspending agent used in Example 25 is mica powder.

[0070] Examples 26-32

[0071] The process parameters of the rubber-promoting dispersion embodiments described in this invention, specifically embodiments 26-32, are shown in Table 1, and the formulations are the same as those in embodiment 1.

[0072] Table 2

[0073]

[0074] Comparative Example 1

[0075] This comparative example provides a rubber-promoted dispersion. The only difference between this comparative example and Example 1 is that no dispersant is added to the formulation of this comparative example, but an equal amount of water is used instead.

[0076] Comparative Example 2

[0077] This comparative example provides a rubber-promoted dispersion. The only difference between this comparative example and Example 1 is that no penetrant is added to the formulation of this comparative example; instead, an equal amount of water is used instead.

[0078] Comparative Example 3

[0079] This comparative example provides a rubber-promoted dispersion. The only difference between this comparative example and Example 1 is that the magnesium aluminum silicate suspending agent is not added to the formulation of this comparative example, but is replaced with an equal amount of the following wetting agent:

[0080] Huntsman's TERIC 320.

[0081] Comparative Example 4

[0082] This comparative example provides a rubber-promoted dispersion. The only difference between this comparative example and Example 1 is that sodium butylnaphthalene sulfonate is not added to the formulation of this comparative example, but is replaced with an equal amount of water.

[0083] Comparative Example 5

[0084] This comparative example provides a rubber-promoted dispersion. The only difference between this comparative example and Example 1 is that polyethylene glycol is not added to the formulation of this comparative example, but is replaced with an equal amount of water.

[0085] Comparative Example 6

[0086] This comparative example provides a rubber-promoted dispersion. The only difference between this comparative example and Example 1 is that the amount of dispersant MF in the formulation of this comparative example is 0.3 parts.

[0087] Tests were conducted on Examples 1-32 and Comparative Examples 1-6, and the test results are shown in Table 3. The test methods are as follows:

[0088] (1) During the process of step (2), observe the grinding condition inside the sand mill;

[0089] (2) The rubber accelerator dispersions prepared in Examples 1-32 and Comparative Examples 1-6 were used as test samples for particle size distribution testing. The instrument used for testing was a Malvern MS2000 laser particle size analyzer, and the dispersant was a Hydro 2000MU. The parameters were set as follows: pump speed 2000 rpm, ultrasonic intensity 20 W / m 2 Dispersion time 30 seconds, measurement time 6 seconds, shading 10%, refractive index 1.33;

[0090] (3) The rubber accelerator dispersions prepared in Examples 1-32 and Comparative Examples 1-6 were placed into transparent reagent bottles, sealed, and left to stand at room temperature for one week. Their appearance changes were observed periodically.

[0091] Table 3

[0092]

[0093] As shown in Table 3, in Examples 1-16, the rubber accelerator dispersions prepared in Examples 1-6 and 8-14 showed no significant sedimentation after standing at room temperature for one week, indicating that the prepared dispersions can be stored for a long time. From Examples 1-7 and Comparative Example 6, it can be seen that as the amount of dispersant MF gradually increases, the particle size D of the rubber accelerator in the dispersion increases. 90 The particle size D exhibits a trend of first decreasing and then increasing. When the weight fraction of dispersant MF is 0.8~4 parts, the particle size D... 90 The particle size was less than 1.0 μm, and no heating or thickening occurred during grinding. No significant sedimentation was observed after standing at room temperature for one week. When the weight of dispersant MF was 1-3 parts, the particle size D of the dispersion rubber accelerator was... 90 With a particle size less than 0.9 μm, the rubber accelerator is more uniformly dispersed in the dispersion, making it more suitable for long-term storage. As shown in Examples 1 and 8-12, with the gradual increase of the amount of penetrant added, the particle size D of the rubber accelerator in the dispersion increases. 90 It exhibits a trend of first decreasing and then increasing. When the weight part of the penetrant is 0.1~1 part, the particle size D... 90 With a particle size of less than 1.0 μm, the rubber accelerator is more evenly dispersed in the dispersion, making it more suitable for long-term storage.

[0094] Examples 1 and 17-18 used different types of dispersants; Examples 1 and 19-22 used different types of rubber accelerators; Examples 1 and 23-24 used different types of penetrants; Examples 1 and 25 used different types of suspending agents. In Example 1, D... 90 The particles are significantly smaller and more uniformly dispersed, indicating that the dispersant MF, accelerator PUR, penetrant Triton X-10, and magnesium aluminosilicate have better diffusion stability.

[0095] Compared to Example 1, the formulation of Comparative Example 1, due to the absence of a dispersant, resulted in the mixed materials failing to disperse completely when added to the disperser for further grinding, thus failing to produce a pre-dispersed material.

[0096] Compared to Example 1, the formulations of Comparative Example 2, which did not contain a penetrant, experienced severe heating and thickening during grinding, making further grinding impossible; the formulation of Comparative Example 3, which did not contain magnesium aluminum silicate but was replaced with an equal amount of wetting agent 320, completely settled and solidified at the bottom of the container during standing, rendering it unusable; the formulation of Comparative Example 4, which did not contain sodium butylnaphthalene sulfonate, began to exhibit heating and thickening near the end of grinding, and partially settled and solidified during standing, with its D... 90 The diameter reached 2.678 μm, which is significantly larger than the D in Example 1. 90 In Comparative Example 5, no polyethylene glycol was added to the formulation, and some sedimentation and caking occurred during the standing process. Its D... 90 It reached 1.965 μm, which is significantly larger than the D in Example 1. 90 This indicates that the dispersant, penetrant, sodium butylnaphthalene sulfonate, polyethylene glycol, and magnesium aluminum silicate selected in this invention can work synergistically to promote uniform dispersion of the rubber accelerator in water. During the preparation of the dispersion, the grinding process will not be interrupted due to heating and thickening. Moreover, the grinding effect is good, the prepared dispersion has good stability, is not easy to settle, and is not easy to precipitate and clump, and can be stored for a long time.

[0097] Examples 1 and 26-32 investigated the effects of different process parameters on the performance of the dispersion. Examples 1 and 26-32 did not show obvious heating and thickening during the grinding process, and there was no obvious sedimentation after standing. Among them, compared with Examples 1 and 26-30, the grinding effect of the grinding medium with a single diameter in Examples 31-32 was relatively poor, resulting in a significantly larger particle size of the rubber accelerator in the prepared dispersion.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A rubber accelerator dispersion, characterized in that, The product comprises the following components in parts by weight: 30-70 parts rubber accelerator, 0.5-7 parts dispersant, 0.01-2 parts penetrant, 0.05-3 parts sodium butylnaphthalene sulfonate, 0.02-1 part polyol, 0.1-5 parts suspending agent, and 12-70 parts water; wherein the dispersant is at least one of the following: formaldehyde condensate of methylnaphthalene sulfonate, formaldehyde condensate of naphthalene sulfonate, formaldehyde condensate of benzylnaphthalene sulfonate, and formaldehyde condensate of alkylbenzene sulfonate; wherein the rubber accelerator is selected from at least one of 3,4,5,6-tetrahydro-2-pyrimidinyl thiol, zinc dibutyldithiocarbamate, N,N'-diphenylthiourea, 1,3-diphenylguanidine, and tetrasulfide bis(pentyl)thiuram; and wherein the polyol is selected from at least one of polyethylene glycol, polypropylene glycol, and polybutylene glycol.

2. The rubber accelerator dispersion as described in claim 1, characterized in that, It contains the following components in parts by weight: 45-65 parts rubber accelerator, 0.8-4 parts dispersant, 0.1-1 parts penetrant, 0.1-0.6 parts sodium butylnaphthalene sulfonate, 0.05-0.2 parts polyol, 0.5-2 parts suspending agent, and 29.9-52.05 parts water.

3. The rubber accelerator dispersion as described in claim 1, characterized in that, At least one of the following (I) to (III): (I) The dispersant is a formaldehyde condensate of methylnaphthalene sulfonate; (II) The penetrant is selected from at least one of polyethylene glycol p-isooctylphenyl ether and fatty alcohol polyoxyethylene ether penetrants; (III) The suspending agent is selected from at least one of magnesium aluminum silicate, mica powder, talc powder, and kaolinite powder.

4. A method for preparing a rubber accelerator dispersion as described in any one of claims 1 to 3, characterized in that, Includes the following steps: (1) Mix water, dispersant, penetrant, sodium butylnaphthalene sulfonate, polyol and suspending agent, add rubber accelerator to obtain pre-dispersed material; (2) Grind the pre-dispersed material obtained in step (1) to obtain a rubber accelerator dispersion.

5. The method for preparing the rubber accelerator dispersion as described in claim 4, characterized in that, Step (1) includes: adding water, dispersant, penetrant, sodium butylnaphthalene sulfonate, polyol and suspending agent into a disperser and mixing them; adding rubber accelerator at a rate not exceeding 300 g / (min·L); and then continuing to stir and disperse for 30~60 min to obtain pre-dispersed material.

6. The method for preparing the rubber accelerator dispersion as described in claim 4, characterized in that, In step (2), the pre-dispersed material is transferred into a grinding mill for grinding. The grinding mill is filled with grinding media, which is at least one of glass beads and zirconia beads, and the diameter of the grinding media is 0.2~1.2mm.

7. The method for preparing the rubber accelerator dispersion as described in claim 6, characterized in that, The grinding media accounts for 40-60% of the capacity of the grinding machine. The grinding media comprises the following components by volume percentage: grinding media A 30-50%, grinding media B 20-40%, and grinding media C 10-50%. The diameter of grinding media A is 0.2-0.4 mm; the diameter of grinding media B is 0.6-0.8 mm; and the diameter of grinding media C is 1.0-1.2 mm.

8. The method for preparing the rubber accelerator dispersion as described in claim 4, characterized in that, The grinding speed in step (2) is 300~800 r / min, and the time is 8~20 min.

9. The use of a rubber accelerator dispersion as described in any one of claims 1 to 3 in the preparation of rubber materials.

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