CN114989487B

CN114989487B - Rubber vulcanization activator and application thereof in replacing zinc oxide with rubber product

Info

Publication number: CN114989487B
Application number: CN202210523392.4A
Authority: CN
Inventors: 戴近禹
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-05-14
Filing date: 2022-05-14
Publication date: 2023-07-28
Anticipated expiration: 2042-05-14
Also published as: CN114989487A

Abstract

The rubber vulcanization activator and its application in replacing zinc oxide with rubber product are that organic fatty acid and aromatic acid are put into a reaction kettle with 120 deg.c, the temperature of the reaction kettle is raised to 140 deg.c, inorganic activator zinc oxide is put into the reaction kettle with a feeder for reaction at 140 deg.c; after the reaction in the reaction kettle is finished, respectively adding quaternary ammonium salt compounds and thiazole compounds, heating the temperature in the reaction kettle to 170 ℃, and stirring at 170 ℃ for 25 minutes to obtain a rubber vulcanization active agent; discharging the rubber vulcanization active agent material in the reaction kettle to a condensation granulator for granulation to obtain the rubber vulcanization active agent. The advantages are that: the rubber vulcanization activator has the advantages of easily available raw materials and low cost, is used for replacing partial zinc oxide in the conventional rubber formula, and can obviously improve the tensile strength of vulcanized rubber and the wear resistance of the vulcanized rubber under the condition that the manufacturing cost is basically not increased.

Description

Rubber vulcanization activator and application thereof in replacing zinc oxide with rubber product

Technical Field

The invention relates to the field of rubber additive assistants, in particular to a rubber vulcanization activator and application thereof in replacing zinc oxide in rubber products.

Background

The zinc oxide can improve the vulcanization reaction speed in the vulcanization reaction process of producing the rubber product, improve the density of the rubber crosslinking reaction, and increase the stretching strength of the vulcanized rubber product, and is an activator for the vulcanization reaction of the rubber product. However, zinc oxide was found to be environmentally polluting in 2003 and certain zinc alloys were found to poison microorganisms and aquatic organisms when released into streams, rivers and oceans and were listed as a list of hazardous substances in the European Union 2003/105/EC regulations. One act (SB 1260) was developed in the state of california in 2016, usa, suggesting the limitation of zinc or zinc oxide for use in tires, limiting the zinc content in the tire product.

Currently, the following four methods for reducing zinc oxide usage in tire products are generally adopted: 1. the zinc oxide is nanocrystallized, namely, the specific surface area of the zinc oxide is increased by reducing the particle size of the zinc oxide, so that the zinc oxide consumption is reduced. 2. The surface activation treatment of the common zinc oxide improves the dispersibility of the zinc oxide, reduces unnecessary loss and realizes the reduction of the zinc oxide consumption. And 3, an organic zinc oxide compound is formed by combining zinc ions with an organic ligand, so that the zinc ions directly participate in the vulcanization reaction, and the zinc oxide consumption is reduced. 4. Zinc oxide inorganic coating. These four ways of reducing zinc oxide usage are generally costly and the rubber mill production is not affordable at the increased high cost; wherein, nano zinc oxide and active zinc oxide are self-aggregated, and are difficult to disperse in the rubber mixing procedure; the zinc methacrylate salt compound SR709 with low zinc content reduces the zinc oxide consumption by about 40%, and has better zinc reducing effect, but the physical and mechanical properties of the rubber are generally not ideal, and can only approach or reach the common zinc oxide level. Thus, the cost of reducing zinc oxide levels in existing tire products is high, process operability is poor, and there is no advantage in performance, which is also a major reason that the market is not active in these zinc oxide level reduction modes.

Disclosure of Invention

The invention aims to provide a rubber vulcanization activator and a method for completely or partially replacing zinc oxide in rubber products. The rubber vulcanization activator has the advantages of easily available raw materials and low cost, can replace partial zinc oxide in the conventional rubber formula, and can obviously improve the tensile strength of vulcanized rubber and the wear resistance of the vulcanized rubber under the condition that the manufacturing cost is basically not increased.

The technical scheme of the invention is as follows:

in one aspect, the invention provides a rubber vulcanization activator, wherein the rubber vulcanization activator comprises the following raw materials in percentage by weight:

the quaternary ammonium salt compound is one of octyl decyl dimethyl ammonium chloride, cetyl dimethyl benzyl ammonium chloride, dialkyl dimethyl ammonium chloride and cetyl trimethyl ammonium chloride:

the thiazole compound is one or two of zinc salt of 2-mercaptobenzothiazole, 2-acetyl thiazole and N-tertiary butyl-2-benzothiazole sulfenamide;

the preparation method of the rubber vulcanization activator comprises the following steps:

(1) Pre-reaction of organic fatty acids, aromatic acids and zinc oxide

Putting organic fatty acid and aromatic acid into a reaction kettle with the temperature of 120 ℃, heating the reaction kettle to 140 ℃, putting inorganic active agent zinc oxide into the reaction kettle by a feeder, and reacting at 140 ℃;

(2) Preparation of rubber vulcanization activators

After the reaction in the reaction kettle is finished, respectively adding quaternary ammonium salt compounds and thiazole compounds, heating the temperature in the reaction kettle to 170 ℃, and stirring at 170 ℃ for 25 minutes to obtain a rubber vulcanization active agent;

(3) Granulating

Discharging the rubber vulcanization active agent material in the reaction kettle in the step (2) to a condensation granulator for granulation to obtain the rubber vulcanization active agent.

Preferably, the rubber vulcanization activator comprises the following raw materials in percentage by weight:

further preferably, the rubber vulcanization activator comprises the following raw materials in weight percent:

in a further preferred embodiment, the rubber vulcanization activator comprises the following raw materials in weight percent:

the rubber vulcanization activator comprises the following raw materials:

preferably, the organic fatty acid is at least one of lauric acid, stearic acid, palmitic acid, oleic acid, and erucic acid.

Preferably, the aromatic acid is at least one of phthalic acid, tetrachloroterephthalic acid, and benzoic acid.

Preferably, when the raw materials in the step (1) react in the reaction kettle, after the reaction liquid level in the reaction kettle is stable, the reaction is finished.

On the other hand, the invention also provides application of the rubber vulcanization activator in replacing zinc oxide in rubber products.

Preferably, the rubber vulcanization activator is used for replacing zinc oxide in rubber products, the rubber vulcanization activator is used for replacing 62.5% of the mass of the zinc oxide activator in a vulcanized rubber base formula, the addition amount of the rubber vulcanization activator is 37.5% of the mass of the zinc oxide in the base formula, the purpose of reducing zinc is achieved, and meanwhile, the tensile strength of vulcanized rubber can be improved, and the wear resistance of the vulcanized rubber is improved.

Preferably, the rubber vulcanization activator is applied to replacing zinc oxide in rubber products, and the rubber vulcanization activator comprises the following components in parts by weight: 100 parts of natural rubber, 1.5 parts of zinc oxide, 1.5 parts of rubber vulcanization activator, and further comprises N330 carbon black, operating oil, sulfur, an accelerator NS, RD-proof paraffin and stearic acid, wherein the dosage of the N330 carbon black, the operating oil, the sulfur, the accelerator NS, the RD-proof paraffin and the stearic acid is the conventional basic dosage of vulcanized rubber.

Further preferably, 55 parts of N330 carbon black, 5.5 parts of operating oil, 1.5 parts of sulfur, 1.1 parts of accelerator NS, 1.0 parts of anti-RD, 1.0 parts of paraffin and 2.5 parts of stearic acid are added to 100 parts of natural rubber in parts by weight.

The invention has the beneficial effects that:

(1) The raw materials are easy to obtain, the cost is low, the quaternary ammonium salt compound in the raw materials of the rubber vulcanization activator realizes stable coordination on the Zn-promotion complex, not only can weaken the bonding force between zinc sulfide (Zn-S), but also can release active sulfur, promote the reaction of the sulfur and rubber macromolecules, improve the performance of vulcanized rubber, the prepared rubber vulcanization activator can replace part of zinc oxide in the conventional rubber formula, and under the condition of basically not increasing the manufacturing cost, the tensile strength of the vulcanized rubber can be obviously improved, and the wear resistance of the vulcanized rubber can be obviously improved.

(2) The rubber vulcanization activator can be used as an activator to replace zinc oxide completely or partially in the production process of rubber products. The vulcanized rubber has the best comprehensive performance when the zinc oxide is replaced by about 60 percent of the common usage, such as: in general, the weight percentage of zinc oxide in the formula of the tire tread rubber is 4 parts, and when 1.5 parts of the rubber vulcanization activator is used instead of 1.5 parts of zinc oxide, the tensile strength of vulcanized rubber can be improved by 3-10%, and the wear resistance of the tire tread rubber is improved by more than 30%. The scorch time of the vulcanized rubber is close to the level of the normal zinc oxide active agent, and the vulcanization speed is better than that of the normal zinc oxide active agent. Therefore, when the dosage of 62.5% of the usual zinc oxide dosage is replaced with rubber vulcanization active agent, higher physical and mechanical properties can be obtained. The rubber vulcanization activator has good compatibility with rubber because of coordination and compounding of organic materials to zinc ions, and the processing and dispersion of the rubber are more uniform. Because the rubber vulcanization activator complex has simple manufacturing process and low manufacturing cost, the product is also more popular in the market.

Drawings

FIG. 1 is a graph comparing tensile strength and 300% elongation strength of a rubber vulcanizate of example 1 of the present invention, where the rubber vulcanization activator is 1.5 parts constant, zinc oxide variable in the formulation;

FIG. 2 is a graph of tensile strength and abrasion loss of a vulcanizate versus the variation of the rubber vulcanization activator for a constant amount of 1.5 parts zinc oxide in a formulation according to example 2 of the present invention;

FIG. 3 is a graph comparing tensile strength and 300% elongation of vulcanizates prepared from the rubber vulcanization activators of example 3, comparative example 1, and comparative example 2 of the present invention;

FIG. 4 is a graph of the quaternary ammonium salt variable rubber vulcanizer of example 3, comparative example 1 and comparative example 2 of the present invention.

Detailed Description

Example 1

(1) Weighing raw materials

Weighing the following raw materials in weight:

(2) Pre-reaction of organic fatty acids and aromatic acids

70kg of organic fatty acid erucic acid and 40kg of aromatic acid phthalic acid are put into a reaction kettle with the temperature of 120 ℃, the organic fatty acid erucic acid and the aromatic acid phthalic acid are completely melted, the reaction kettle is continuously heated to 140 ℃, 18kg of inorganic active agent zinc oxide is put into the reaction kettle by a feeder, and the reaction is carried out at 140 ℃;

(3) Preparation of rubber vulcanization activators

After the reaction liquid level in the reaction kettle is stable, continuously adding 34kg of octyl decyl dimethyl ammonium chloride serving as a quaternary ammonium salt compound and 38kg of 2-acetyl thiazole serving as a thiazole compound after the reaction in the reaction kettle is finished, continuously heating to 170 ℃ in the reaction kettle, and stirring for 25 minutes at 170 ℃ to obtain a rubber vulcanization active agent;

(4) Granulating

Discharging the rubber vulcanization active agent materials in the reaction kettle in the step (3) into a condensation granulator for granulation to obtain rubber vulcanization active agent particles.

Example 2

(1) Weighing raw materials

Weighing the following raw materials in weight:

(2) Pre-reaction of organic fatty acids and aromatic acids

82kg of organic fatty acid stearic acid and 36kg of aromatic acid benzoic acid are put into a reaction kettle with the temperature of 120 ℃, when the stearic acid and the benzoic acid are completely melted, the reaction kettle is continuously heated to 140 ℃, 26kg of inorganic active agent zinc oxide is put into the reaction kettle by a feeder, and the reaction is carried out at 140 ℃;

(3) Preparation of rubber vulcanization activators

After the reaction liquid level in the reaction kettle is stable, continuously adding 18kg of cetyl trimethyl ammonium chloride serving as a quaternary ammonium salt compound and 20kg of 2-mercaptobenzothiazole zinc salt serving as a thiazole compound after the reaction in the reaction kettle is finished, continuously heating to 170 ℃ in the reaction kettle, and stirring for 25 minutes at 170 ℃ to obtain a rubber vulcanization active agent;

(4) Granulating

1. Comparative test of rubber vulcanization activator particles of inventive examples 1 and 2 instead of Zinc oxide application

1. Inventive example 1 rubber vulcanization activator partial replacement Zinc oxide activator application Compare

(1) Vulcanized rubber conventionally, 4 parts by weight of zinc oxide was added to 100 parts by weight of natural rubber, as shown in table 1;

TABLE 1 rubber vulcanization activator 1.5 constant, zinc oxide variable as rubber application comparative test Table

(2) Sample preparation

(1) Firstly, adjusting the roll gap of a laboratory XKR-150 type open mill to 0.5m/m, thinning and passing natural rubber for 4 times, adjusting the roll gap of the open mill to 2.0m/m, gradually mixing N330 carbon black mixed with operation oil into rubber, thinning and passing the masterbatch mixed with the carbon black for 5 times under the roll gap of 0.5m/m of the open mill, adding other residual raw materials in the formula of the table 1, uniformly mixing, and thinning and passing for 5 times; finally, the roll spacing is adjusted to 2.0m/m and pressed into a prefabricated sample sheet for standby;

(2) heating the prefabricated sample sheet pressed in the step 1) at 150 ℃ for 40 minutes to obtain a vulcanized rubber sample sheet;

(3) Test pieces were prepared from the rubber vulcanization activator prepared in example 1 according to the formulation of table 1 using the process described above for sample preparation, wherein the vulcanization properties of the vulcanized rubber test pieces were carried out on a rotor-free vulcanizer under the experimental conditions of 150 ℃ for 60 minutes, and the test properties are shown in table 2.

Table 2 table of the results of performance tests for comparative tests of rubber applications according to the formulation of table 1

The comparative example of the application of the rubber vulcanization activator in the embodiment 1 of the invention to partially replace the zinc oxide activator is that when the constant amount of 1.5 parts by weight of the rubber vulcanization activator in the embodiment 1 is not changed, the weight of the zinc oxide is gradually increased from 1.0 to 1.75 parts by weight. As can be seen from Table 2, when 1.5 parts of the rubber vulcanization activator of example 1 is used, the combination properties of 1.5 to 1.75 parts of zinc oxide with vulcanized rubber are best, and the zinc reduction requirement is considered, and the addition weight of zinc oxide is preferably 1.5 parts.

2. Example 2 comparative application of rubber vulcanization activator to partially replace Zinc oxide activator

(1) The vulcanized rubber is conventionally prepared by adding 4 parts by weight of zinc oxide into every 100 parts by weight of natural rubber, and the invention uses rubber vulcanization active agent to replace part of zinc oxide so as to achieve the purpose of reducing zinc; the specific formulation amounts are shown in Table 3;

TABLE 3 comparative test Table of rubber application with a constant of 1.5 parts Zinc oxide and rubber vulcanization activator variables

(2) Sample preparation

(1) Firstly, regulating the roll gap of a laboratory XKR-150 type open mill to about 0.5m/m, thinning and passing natural rubber for 4 times, releasing the roll gap to about 2.0m/m, gradually mixing carbon black mixed with operation oil into rubber, thinning and passing the master batch mixed with the carbon black for 5 times under the roll gap of 0.5m/m of the open mill, then adding other residual raw materials in a formula, and thinning and passing for 5 times after uniform mixing; finally, the roll spacing is adjusted to 2.0m/m and pressed into a prefabricated sample sheet for standby;

(3) Test pieces were prepared from the rubber vulcanization activator prepared in example 1 according to the formulation of Table 3 using the process described above for sample preparation, wherein the vulcanization properties of the vulcanized rubber test pieces were carried out on a rotor-free vulcanizer under the experimental conditions of 150℃for 60 minutes, and the test properties are shown in Table 4.

Table 4 compares the physical properties of the compounds

The comparative example of the application of the rubber vulcanization activator in the embodiment 2 of the invention to replace the zinc oxide activator partially is that when the constant amount of 1.5 parts by weight of zinc oxide in the embodiment 2 is unchanged, the weight of the rubber vulcanization activator is gradually increased from 1.0 to 2.0 parts by weight, and as can be seen from the table 4, the formula dosage of the rubber vulcanization activator is 1.5 parts by weight and the tensile strength is 8.66 percent higher than that of 4.0 parts by weight of zinc oxide in the normal formula. The abrasion volume was reduced by 37.5%, indicating an improvement in abrasion resistance of 37.5% when used in tires. The zinc oxide consumption is reduced by 2.5 parts, accounting for 62.5 percent of the zinc oxide.

Example 3

(1) Weighing raw materials

Weighing the following raw materials in parts by weight: 38 g of organic fatty acid lauric acid, 23 g of aromatic acid benzoic acid, 12 g of quaternary ammonium salt compound cetyl dimethyl benzyl ammonium chloride, 19 g of thiazole compound 2-mercaptobenzothiazole zinc salt and 8 g of inorganic active agent zinc oxide;

(2) Heat conducting oil heating

400 ml of heat conduction oil is poured into a 1000 ml material cup, and the heat conduction oil is heated to 200 ℃ on an electric furnace;

(3) Pre-reaction of organic fatty acids and aromatic acids

Adding 38 g of organic fatty acid lauric acid and 23 g of aromatic acid benzoic acid into a 200 ml material cup, placing the material cup on heated heat conduction oil, adding 8 g of inorganic active agent zinc oxide while stirring when materials in the material cup are heated to 140 ℃ and reacting at 140 ℃;

(4) Preparation of rubber vulcanization activators

After the liquid level of the reactant in the material cup is stable, the reaction is finished, 12 g of cetyl dimethylbenzyl ammonium chloride serving as a quaternary ammonium salt compound and 19 g of 2-mercaptobenzothiazole zinc salt serving as a thiazole compound are continuously added into the material cup, the temperature is continuously increased to 170 ℃, and stirring is carried out for 25 minutes at 170 ℃, so that the rubber vulcanization activator is obtained.

Comparative example 1

(1) Weighing raw materials

(2) Heat conducting oil heating

(3) Pre-reaction of organic fatty acids and aromatic acids

Adding 38 g of organic fatty acid lauric acid and 23 g of aromatic acid benzoic acid into a 200 ml material cup, placing the material cup on heated heat conduction oil, adding 8 g of inorganic active agent zinc oxide into the material cup while stirring when the material cup is heated to 140 ℃, and reacting at 140 ℃;

(3) Preparation of rubber vulcanization activators

After the liquid level of the reaction material in the material cup is stable, continuously adding 6 g of cetyl dimethylbenzyl ammonium chloride serving as a quaternary ammonium salt compound and 19 g of 2-mercaptobenzothiazole zinc salt serving as a thiazole compound into the material cup after the reaction is finished, continuously heating to 170 ℃, and stirring for 25 minutes at 170 ℃ to obtain the rubber vulcanization activator.

Comparative example 2

(1) Weighing raw materials

(2) Heat conducting oil heating

(3) Pre-reaction of organic fatty acids and aromatic acids

Adding 38 g of organic fatty acid lauric acid and 23 g of aromatic acid benzoic acid into a 200 ml material cup, placing the material cup on heated conductive oil, adding 8 g of inorganic active agent zinc oxide into the material cup while stirring when the material cup is heated to 140 ℃ for reaction at 140 ℃;

(3) Preparation of rubber vulcanization activators

After the liquid level of the reactant in the material cup is stable, the reaction is finished, 19 g of thiazole compound 2-mercaptobenzothiazole zinc salt is continuously added, the temperature is continuously increased to 170 ℃, and the mixture is stirred for 25 minutes at 170 ℃ to obtain the rubber vulcanization activator.

The quaternary ammonium salt compound is a derivative of organic amine containing nitrogen, the invention utilizes the electron donating ability of nitrogen in quaternary ammonium salt molecules and has the characteristic of stronger surface activity in acid medium, the stable coordination on the Zn-promotion complex is realized, not only can the bonding force between zinc sulfide (Zn-S) be weakened, active sulfur is released, the reaction of sulfur and rubber macromolecules is promoted, and the performance of vulcanized rubber is improved. The presence or absence and the amount of the quaternary ammonium salt have a significant influence on the functional characteristics of the present invention. In the invention, the cetyl dimethyl benzyl ammonium chloride quaternary ammonium salt compound is used in the embodiment 3 and the comparative example 1 and the comparative example 2, the dosage of other raw materials and the preparation method are unchanged, only the dosage of the cetyl dimethyl benzyl ammonium chloride quaternary ammonium salt compound is changed, the prepared rubber activator particles are added into natural rubber, and the rubber performance is detected, wherein the specific research process is as follows:

(1) The amounts of the raw materials used in inventive example 3, comparative example 1 and comparative example 2 are shown in Table 5;

TABLE 5 usage of the raw materials of inventive example 3, comparative example 1 and comparative example 2

	Example 3	Comparative example 1	Comparative example 2
				Lauric acid	38 g	38 g	38 g
Benzoic acid	23 g	23 g	23 g
				Cetyl dimethyl benzyl ammonium chloride	12 g	6 g	—
Zinc salt of 2-mercaptobenzothiazole	19 g	19 g	19 g
				Zinc oxide	8 g	8 g	8 g

(2) The vulcanized rubber is conventionally prepared by adding 4g of zinc oxide into 100g of natural rubber, and the invention replaces part of zinc oxide by using a rubber vulcanization active agent so as to achieve the purpose of reducing zinc. Specific formulation amounts are shown in Table 6, and the rubber vulcanization activators prepared in example 3, comparative example 1 and comparative example 2 of the present invention were used to prepare test pieces of vulcanized rubber products by the same process (see sample preparation in example 2 of example 1) according to the formulation of Table 6, and the properties of the vulcanized rubbers after the test are shown in Table 7.

TABLE 6 influence comparison formula of quaternary ammonium salts

TABLE 7 Effect of quaternary ammonium salts in the inventive compositions on rubber vulcanization Properties

The results of table 5 and table 7 show that the physical and mechanical properties of the vulcanized rubber are obviously different from those of the raw materials prepared in example 3 and comparative example 1, in which the addition ratio of the quaternary ammonium salt is 12% compared with 6%, the tensile strength and the 300% stretching strength are respectively reduced by 9.1% and 8.0%, while in comparative example 2, the crosslinking density of the vulcanized rubber is very low and the 300% stretching strength cannot meet the application function requirement of the vulcanized rubber. Therefore, the quaternary ammonium salt variety and the reasonable addition of the blending quantity are critical to the performance of the vulcanized rubber.

The above is only a specific embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rubber vulcanization activator is characterized in that:

the rubber vulcanization activator comprises the following raw materials in percentage by weight:

28-43% of organic fatty acid;

18-25% of aromatic acid;

9-20% of quaternary ammonium salt compound;

8-21% of thiazole compounds;

8-16% of inorganic active agent zinc oxide;

(1) Pre-reaction of organic fatty acids, aromatic acids and zinc oxide

(2) Preparation of rubber vulcanization activators

(3) Granulating

2. The rubber vulcanization activator of claim 1, characterized by:

35-41% of organic fatty acid;

18-23% of aromatic acid;

9-17% of quaternary ammonium salt compound;

a thiazole compound 19%;

8-13% of inorganic active agent zinc oxide.

3. The rubber vulcanization activator of claim 2, characterized by:

38% of organic fatty acid;

23% of aromatic acid;

12% of quaternary ammonium salt compounds;

a thiazole compound 19%;

8% of inorganic active agent zinc oxide;

or (b)

35% of organic fatty acid;

20% of aromatic acid;

17% of quaternary ammonium salt compounds;

a thiazole compound 19%;

9% of inorganic active agent zinc oxide;

or (b)

Organic fatty acid 41%;

18% of aromatic acid;

9% of quaternary ammonium salt compounds;

a thiazole compound 19%;

13% of inorganic active agent zinc oxide.

4. The rubber vulcanization activator of claim 1, characterized by: the organic fatty acid is at least one of lauric acid, stearic acid, palmitic acid, oleic acid and erucic acid.

5. The rubber vulcanization activator of claim 1, characterized by: the aromatic acid is at least one of phthalic acid, tetrachloroterephthalic acid and benzoic acid.

6. Use of the rubber vulcanization activator of claim 1 in rubber products instead of zinc oxide.

7. The use of a rubber vulcanization activator according to claim 6 in the replacement of zinc oxide for rubber products, characterized in that:

the rubber vulcanization activator replaces 62.5% of the zinc oxide activator in the vulcanized rubber basic formula, the addition amount of the rubber vulcanization activator accounts for 37.5% of the zinc oxide in the basic formula, the purpose of reducing zinc is achieved, and meanwhile, the tensile strength of vulcanized rubber and the wear resistance of the vulcanized rubber can be improved.

8. The use of a rubber vulcanization activator according to claim 7 in the replacement of zinc oxide for rubber products, characterized in that:

the weight portions are as follows: 100 parts of natural rubber, 1.5 parts of zinc oxide, 1.5 parts of rubber vulcanization activator, and further comprises N330 carbon black, operating oil, sulfur, an accelerator NS, RD-proof paraffin and stearic acid, wherein the dosage of the N330 carbon black, the operating oil, the sulfur, the accelerator NS, the RD-proof paraffin and the stearic acid is the conventional basic dosage of vulcanized rubber.

9. Use of a rubber vulcanization activator according to claim 8 in place of zinc oxide in rubber products, characterized in that: every 100 parts of natural rubber is added with 55 parts of N330 carbon black, 5.5 parts of operating oil, 1.5 parts of sulfur, 1.1 parts of accelerator NS, 1.0 parts of RD, 1.0 part of paraffin and 2.5 parts of stearic acid.