CN107325349A - A kind of belting and preparation method thereof - Google Patents

Abstract

The invention discloses a transmission belt material. The formula consists of: 10-25 parts of natural rubber, 25-40 parts of styrene-butadiene rubber, 60-75 parts of nitrile rubber, 1-4 parts of sulfur, 5-8 parts of plasticizer, 2-5 parts of adhesive, 7-11 parts of zinc oxide, 2-4 parts of anti-aging agent RD, 1.5-3 parts of anti-aging agent NBC, 0.5-2 parts of anti-aging agent DNP, 15-18 parts of carbon black, 5 parts of white carbon black ‑6 parts, N‑cyclohexyl‑2‑benzothiazole sulfenamide 1‑3 parts, 2,2'‑dithiodibenzothiazole 1‑2 parts, stearic acid 3‑5 parts, Gumma Long resin 10-11 parts, pine tar oil 3.5-5 parts, above-mentioned are mass parts. The preparation method is: (1) put natural rubber, styrene-butadiene rubber, and nitrile rubber into the internal mixer, heat to 110-120°C, (2) add half of the carbon black and heat up to 145-155°C and mix for 4-6 Minutes, sequentially add zinc oxide, white carbon black, coumarone resin, accelerator, anti-aging agent for mixing. (3) Add the remaining carbon black, plasticizer, sulfur, and pine tar into the open mill and continue mixing for 6‑9 minutes to obtain the masterbatch. (4) Put the masterbatch into a vulcanization mold for vulcanization.

Description

A kind of transmission belt material and preparation method thereof

technical field

The invention belongs to the technical field of rubber materials, and in particular relates to a transmission belt material and a preparation method thereof.

Background technique

The essence of the transmission belt is a connection belt that transmits the power source to the equipment by means of the connection of the mechanical structure, so that the equipment can run. Because the transmission belt has the excellent performance of free variable speed, low price and convenient replacement, it plays an important role in today's mechanical transmission components, so the quality of the transmission belt material will directly affect the operation of mechanical equipment and the quality of its production parts. With the rapid development of the contemporary machinery industry, especially some new agricultural machinery, automobile and other industries, the requirements for the performance of transmission belt materials are becoming more and more stringent. The development of transmission belt materials has gone through a series of stages, from natural rubber to synthetic rubber, and now to special synthetic rubber. The power source transmits the power to the mechanical equipment with the help of the friction between the rubber transmission belt and the mechanical structure. However, after the equipment has been in operation for a long time, the rubber transmission belt will inevitably wear out under the action of this friction force. In addition, a large amount of These will seriously affect the quality and performance of the transmission belt. Therefore, it is very important to reduce the friction and wear of the rubber material of the transmission belt and improve its high temperature resistance and wear resistance, which will directly determine the service life of the transmission belt. In the existing manufacturing technology, the purpose of improving the performance of rubber materials is basically achieved by adjusting the types and contents of processing aids and reinforcing agents added to the rubber. However, such an approach does not have a significant effect on improving the high temperature and wear resistance of the rubber material. With the rapid development of my country's machinery manufacturing industry, the domestic demand for high-temperature and wear-resistant transmission belts has increased sharply in recent years.

Contents of the invention

In view of this, the present invention provides a rubber material for transmission belts, which has good heat resistance and wear resistance.

In order to achieve the above object, the technical scheme adopted in the invention is as follows:

A transmission belt material prepared from the following components in parts by mass: 10-25 parts of natural rubber, 25-40 parts of styrene-butadiene rubber, 60-75 parts of nitrile rubber, 1-4 parts of sulfur, and 5-8 parts of plasticizer 2-5 parts of binder, 7-11 parts of zinc oxide, 2-4 parts of anti-aging agent RD, 1.5-3 parts of anti-aging agent NBC, 0.5-2 parts of anti-aging agent DNP, 15-18 parts of carbon black, white carbon 5-6 parts of black, 1-3 parts of N-cyclohexyl-2-benzothiazole sulfenamide, 1-2 parts of 2,2'-dithiodibenzothiazole, 3-5 parts of stearic acid, 10-11 parts of coumarone resin, 3.5-5 parts of pine tar oil, the above are parts by mass.

The composition ratio of the anti-aging agent RD, anti-aging agent NBC and anti-aging agent DNP is 4:3:2.

Described carbon black is carbon black N660.

The composition ratio of carbon black to white carbon black is 3:1. The binder is hexamethoxymethylmelamine.

The plasticizer is diisononyl phthalate.

The preparation method of the rubber material that above-mentioned driving belt is used, comprises the following steps:

(1) Put natural rubber, styrene-butadiene rubber, and nitrile rubber into the internal mixer and heat to 110-120°C.

(2) Add half of the carbon black and raise the temperature to 145-155°C and knead for 4-6 minutes, then add zinc oxide, white carbon black, coumarone resin, accelerator, and anti-aging agent in turn for kneading.

(3) Add the remaining carbon black, plasticizer, sulfur and pine tar into the open mill and continue mixing for 6-9 minutes to obtain the masterbatch.

(4) Put the masterbatch into a vulcanization mold for vulcanization treatment to obtain a rubber material.

Further, the vulcanization temperature in the step (4) is 175° C., the pressure is increased to 200 MPa, and the vulcanization time is 400 seconds.

Compared with the prior art, the present invention has the advantages of scientific and reasonable formula, using nitrile rubber as the main material, which can enhance heat resistance, wear resistance and aging resistance, and various reinforcing agents such as zinc oxide and carbon black are added Mixing with processing aids not only reduces the cost, but also improves the physical and mechanical properties and processing properties of the mixing masterbatch. The preparation process is simple and easy to operate. The prepared materials can be used for a long time in a high temperature environment of 140 °C , and can be used for a short time at a high temperature of 160°C, and at the same time greatly reduce the cost, it can meet the requirements of high temperature resistance, wear resistance, and high load of the transmission belt, and has a long service life. It has a broad market and application prospects.

detailed description

The technical solution of the present invention will be further described below in conjunction with the embodiments.

Embodiment 1 The formula of transmission belt material consists of: 10 parts of natural rubber, 25 parts of styrene-butadiene rubber, 60 parts of nitrile rubber, 1 part of sulfur, 5 parts of plasticizer, 2 parts of adhesive, 7 parts of zinc oxide, anti-aging agent 2 parts of RD, 1.5 parts of anti-aging agent NBC, 0.5 parts of anti-aging agent DNP, 15 parts of carbon black, 5 parts of white carbon black, 1 part of N-cyclohexyl-2-benzothiazole sulfenamide, 2, 2'- 1 part of dithiodibenzothiazole, 3 parts of stearic acid, 10 parts of coumarone resin, 3.5 parts of pine tar, the above are parts by mass.

The preparation method of embodiment 1 comprises the following steps

According to the formula, put natural rubber, styrene-butadiene rubber, and nitrile rubber into the internal mixer at room temperature, heat to 110°C, then add half of the carbon black and heat up to 145°C for 4 minutes of mixing, and then follow the order to Add zinc oxide, binder, white carbon black, coumarone resin, accelerator and anti-aging agent to the internal mixer for mixing. Afterwards, at normal temperature, the remaining carbon black, plasticizer, sulfur, and pine tar were sequentially added into the open mill to continue mixing for 6 minutes to obtain a mixing masterbatch.

Then, the masterbatch extrusion molding operation is carried out. This operation is mainly to put the masterbatch into a vulcanization mold and vulcanize for 400 seconds under a pressure of 200MPa and a temperature of 175°C to obtain a rubber material.

Finally, the rubber material is trimmed, inspected, packaged and stored to obtain the required transmission belt material.

In the above rubber material scheme, carbon black is one of the most commonly used reinforcing agents in rubber manufacturing and production, which can significantly improve the tensile strength, hardness and wear resistance of rubber. In the present invention, the anti-wear performance of rubber can be increased several times to eight times. In addition in the present invention, carbon black can select carbon black N332, carbon black N774, carbon black N220, carbon black N332, carbon black N330, carbon black N375, carbon black N550, one or in carbon black N660 and carbon black N770 Any combination, preferably carbon black N660.

As one of the reinforcing agents, white carbon black is characterized by its white appearance, but its reinforcing effect on rubber is only weaker than that of carbon black. In addition, compared with carbon black, its particles are finer, so after adding white carbon black, the tensile strength, hardness and wear resistance of rubber are greatly improved, so it can replace carbon in some rubber production processes. Black, so that higher quality rubber products can be produced. In industrial production, carbon black and white carbon black are usually used at the same time, so that rubber products with excellent properties can be obtained.

The main function of the plasticizer is to improve the rubber processing technology, so that the rubber is easy to be extruded during processing, and it can also improve some physical and mechanical properties of the rubber, not only reducing the modulus of the rubber, but also increasing the elasticity of the rubber. In addition, when the plasticizer is used together with zinc oxide, it not only increases the crosslinking density of the rubber, but also increases the heat resistance and aging resistance of the rubber material and other properties. In addition, in the present invention, the plasticizer is selected as diisononyl phthalate.

The binder is used to enhance the adhesion between the rubber matrix, processing aids and fillers during processing, and the binder is hexamethoxymethylmelamine.

The scientific name of anti-aging agent DNP is N,N-di(β-naphthyl)-p-phenylenediamine, which is an anti-aging agent with excellent performances such as high temperature resistance, oxygen oxidation resistance and atmospheric aging resistance. But it is easy to bloom when adding more than 2 parts. The anti-aging agent DNP is suitable to be added to synthetic rubber such as natural rubber, neoprene rubber, styrene-butadiene rubber and butadiene rubber, so as to improve its performance of high temperature resistance, oxidation resistance and atmospheric aging resistance.

The above-mentioned carbon black N332, carbon black N774, carbon black N220, carbon black N332, carbon black N330, carbon black N375, carbon black N550, carbon black N660, carbon black N770 and antioxidant RD, antioxidant NBC are all known raw materials No more details here.

The formula of embodiment 2 driving belt material consists of: 25 parts of natural rubber, 40 parts of styrene-butadiene rubber, 75 parts of nitrile rubber, 4 parts of sulfur, 8 parts of plasticizer, 5 parts of adhesive, 11 parts of zinc oxide, anti-aging agent 4 parts of RD, 3 parts of anti-aging agent NBC, 2 parts of anti-aging agent DNP, 18 parts of carbon black, 6 parts of white carbon black, 3 parts of N-cyclohexyl-2-benzothiazole sulfenamide, 2, 2'-di Thiodibenzothiazole 2 parts, stearic acid 5 parts, coumarone resin 11 parts, pine tar oil 5 parts. The above are parts by mass.

The preparation method of embodiment 2 comprises the following steps

According to the formula, put natural rubber, styrene-butadiene rubber, and nitrile rubber into the internal mixer at room temperature, heat to 120°C, then add half of the carbon black and heat up to 155°C for 6 minutes of mixing, and then follow the order to the compactor Add zinc oxide, binder, white carbon black, coumarone resin, accelerator and anti-aging agent to the refining machine for mixing. Then add the remaining carbon black, plasticizer, sulfur and pine tar successively in the open mill at normal temperature and continue mixing for 9 minutes to obtain the mixing masterbatch.

Then, the masterbatch extrusion molding operation is carried out. This operation is mainly to put the masterbatch into a vulcanization mold and vulcanize for 400 seconds under a pressure of 20MPa and a temperature of 175°C to obtain a rubber material.

Finally, the rubber material is trimmed, inspected, packaged and stored to obtain the required transmission belt material.

Embodiment 3 The formula of transmission belt material consists of: 20 parts of natural rubber, 35 parts of styrene-butadiene rubber, 70 parts of nitrile rubber, 3 parts of sulfur, 6 parts of plasticizer, 4 parts of adhesive, 9 parts of zinc oxide, anti-aging agent 3 parts of RD, 2.25 parts of anti-aging agent NBC, 1.5 parts of anti-aging agent DNP, 15 parts of carbon black, 5 parts of white carbon black, 2 parts of N-cyclohexyl-2-benzothiazole sulfenamide, 2, 2'- Dithiodibenzothiazole 1.5 parts, stearic acid 4 parts, coumarone resin 10.5 parts, pine tar oil 4 parts. The above are parts by mass.

The preparation method of embodiment 3 comprises the following steps

According to the formula, put natural rubber, styrene-butadiene rubber, and nitrile rubber into the internal mixer at room temperature, heat to 115°C, then add half of the carbon black and heat up to 150°C for 5 minutes of mixing, and then follow the order to the compactor Add zinc oxide, binder, white carbon black, coumarone resin, accelerator and anti-aging agent to the refining machine for mixing. Then add the remaining carbon black, plasticizer, sulfur and pine tar successively in the open mill at normal temperature and continue mixing for 7 minutes to obtain the mixing masterbatch.

Then, the masterbatch extrusion molding operation is carried out. This step is mainly to put the masterbatch into a vulcanization mold and vulcanize for 400 seconds under a pressure of 20MPa and a temperature of 175°C to obtain a rubber material.

Finally, the rubber material is trimmed, inspected, packaged and stored to obtain the required transmission belt material.

The present invention is described further below:

Characteristics of styrene-butadiene rubber: styrene-butadiene rubber is an elastomer based on butadiene and styrene as monomers, so its high temperature resistance, abrasion resistance and aging resistance are better than natural rubber, especially under high temperature conditions The wear resistance is very excellent. In addition, styrene-butadiene rubber has a strong ability to accept fillers, and its mixing performance with various rubbers is good, especially when it is mixed with natural rubber or butadiene rubber, it can be greatly improved by adjusting the material content in the formula. Insufficient styrene-butadiene rubber.

The characteristics of nitrile rubber: nitrile rubber is a polymer elastomer prepared by the polymerization of two monomers, butadiene and acrylonitrile. Due to the acrylonitrile structure, and the cyano group has a strong ability to absorb free electrons, the hydrogen ions on the allyl group are not easy to lose, so the high temperature resistance is stronger than natural rubber, styrene-butadiene rubber, etc. If a suitable material formula is used Ratio, it can be used at a high temperature of 160°C. Due to the polarity of nitrile rubber, it will increase its internal intermolecular force, thereby increasing its anti-wear performance. Therefore, the anti-wear performance of nitrile rubber can be 25% to 40% higher than that of natural rubber.

The invention adds styrene-butadiene rubber and nitrile rubber to natural rubber as the main material to enhance its heat resistance, wear resistance and aging resistance, and various reinforcing agents such as zinc oxide and carbon black are added to mix with processing aids. Refining not only reduces the cost, but also improves the physical and mechanical properties and processing properties of the mixed masterbatch. The rubber material obtained in Examples 1 to 3 of the present invention and the chlorosulfonated polyethylene material, neoprene material, and hydrogenated nitrile rubber material used for conveyor belts on the market are tested in the following table, and the material used in Comparative Example 1 is chlorosulfur The hydrogenated polyethylene material, the material used in comparative example 2 is neoprene material, and the material used in comparative example 3 is hydrogenated nitrile rubber, and the testing results are as follows:

Hardness, Shore A Tensile strength, Mpa Elongation at break,% Thermal fatigue test, crack generation time (h) Example 1 65 twenty two 580 660 Example 2 70 26 600 670 Example 3 68 twenty three 588 655 Comparative example 1 70 18 230 530 Comparative example 2 85 18 480 600 Comparative example 3 67 20 510 500

Among them, the testing tests are commonly used tests in this field. In addition, the thermal fatigue test is carried out at the speed (N)=3500rmp, the load (T)=120N, and the temperature (t)=110±3°C.

Claims (8)

1. a kind of belting, it is characterised in that：The formula of described belting is constituted：10-25 parts of natural rubber, 25-40 parts of butadiene-styrene rubber, 60-75 parts of nitrile rubber, 1-4 parts of sulphur, 5-8 parts of plasticizer, 2-5 parts of adhesive, zinc oxide 7-11 Part, 2-4 parts of anti-aging agent RD, 1.5-3 parts of antioxidant NBC, 0.5-2 parts of antioxidant D NP, 15-18 parts of carbon black, white carbon 5-6 Part, N- cyclohexyls -1-3 parts of 2-[4-morpholinodithio sulfenamide, 2,1-2 parts of 2'- dithio-bis-benzothiazoles, 3-5 parts of stearic acid, Gu Grand resin 10-11 parts of horse, 3.5-5 parts of pine tar, above-mentioned is mass parts.

2. belting according to claim 1, it is characterised in that：It is described anti-aging agent RD, antioxidant NBC, anti-old Agent DNP component ratio is 4：3：2.

3. belting according to claim 1, it is characterised in that：Described carbon black is carbon black N660.

4. belting according to claim 1, it is characterised in that：Described carbon black is 3 in the component ratio of white carbon： 1。

5. belting according to claim 1, it is characterised in that：Described binder is hexamethoxy methyl honey Amine.

6. belting according to claim 1, it is characterised in that：Described plasticizer is the different nonyl of phthalic acid two Ester.

7. the preparation method of belting according to claim 1, it is characterised in that comprise the following steps：

（1）By in natural rubber, butadiene-styrene rubber, nitrile rubber input banbury, 110-120 DEG C is heated to；

（2）The carbon black of addition half is warming up to 145-155 DEG C and kneaded 4-6 minutes, sequentially adds zinc oxide, white carbon, coumarone Resin, accelerator, age resistor are kneaded；

（3）Remaining carbon black is added into mill and plasticizer, sulphur, pine tar continue mixing and obtain rubber master batch in 6-9 minutes；

（4）Rubber master batch is inserted into progress vulcanizing treatment in sulfurizing mould and obtains elastomeric material.

8. the preparation method of belting according to claim 7, it is characterised in that：The step（4）In vulcanization Temperature is 175 DEG C, is forced into 200MPa, and cure time is 400 seconds.