A high adhesion belt rubber composition, its preparation method and use

Abstract

The application relates to the technical field of tire rubber manufacturing, and discloses a high-adhesion belt layer rubber composition and a preparation method and application thereof.The rubber composition is prepared by mixing and preparing the following components according to 100 parts by weight of raw rubber: 75-95 parts of natural rubber, 5-25 parts of isoprene rubber, 40-70 parts of carbon black, 1-5 parts of cobalt neodecanoate, 0.1-8 parts of adhesive resin SL3020, 0.1-10 parts of adhesive BPRA-65, and 0.1-10 parts of hardening resin SL2201.The adhesive resin SL3020, the adhesive BPRA-65 and the hardening resin SL2201 are compounded, the adhesive resin SL3020 and the adhesive BPRA-65 can form a three-dimensional network structure, and the hardening resin SL2201 can effectively enhance the network structure, so that the adhesion between the belt rubber and the steel cord is improved, the adhesion between the belt layers is improved, and the heat resistance and aging resistance of the tire are improved.

Description

Technical Field

[0001] This invention relates to the field of tire rubber manufacturing technology, and more specifically, to a high-adhesion belt layer rubber composition, its preparation method, and its application. Background Technology

[0002] Radial tires can withstand high loads and high-frequency movements due to the unique structure of the belt ply. The belt ply, also known as the support layer, hard buffer layer, or stabilizing layer, refers to the material layer that tightens the tire carcass along the circumference of the tread centerline beneath the base of the tread in radial and bias-ply tires. Composed of rubber and a reinforcing material (copper-plated steel cord), the belt ply primarily serves to tighten the tire carcass, in addition to cushioning impacts. It is also a major load-bearing component, relying on the excellent adhesion between the rubber and reinforcing materials. Therefore, high-strength, high-modulus, and small-angle-arranged cords should be used as reinforcement, while being covered with high-elongation, high-hardness rubber.

[0003] Damage to the belt layer can cause serious accidents. The main factors contributing to damage to the steel wires and rubber in the belt layer are: 1) the adhesive force between the materials (interface area); and 2) the strength of the materials themselves (the cohesive force of the rubber). In other words, a decrease in the adhesive strength between the rubber and the steel cord, and a decline in the physical properties of the rubber coating on the steel cord, will lead to damage to the belt layer. The bonding mechanism between the tire belt layer rubber compound and the copper-plated steel cord is as follows: the copper plating on the surface of the steel cord reacts with elemental sulfur in the rubber compound to form Cu. x S. The sulfur in the belt layer compound formulation not only crosslinks with natural rubber (NR), but also reacts with the copper on the surface of the copper-plated steel wire to form an adhesive layer.

[0004] In practical use, poor adhesion between the copper-plated steel cords used in the belt layer and the rubber can lead to delamination or even tire blowouts, posing safety hazards during tire use. Therefore, a strong and stable bond between the rubber and the copper-plated steel cords is a crucial factor in determining tire lifespan, and the belt rubber compound's bonding system needs to possess superior adhesion performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-adhesion belt layer rubber composition, its preparation method, and its application. This belt layer rubber composition exhibits high adhesion, which can improve the adhesion performance between the belt rubber material and the steel wire cord, as well as the adhesion force between belt layers.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A high-adhesion belt layer rubber composition, said rubber composition is prepared by mixing raw materials comprising the following components based on 100 parts by weight of raw rubber: 75-95 parts natural rubber 5-25 parts of isoprene rubber 40-70 parts carbon black 1-5 parts of cobalt neodecanoate 1-8 parts of adhesive resin SL3020 BPRA-65 adhesive 1-10 parts Hardening resin SL2201 1-10 parts.

[0007] Preferably, the rubber composition is prepared by mixing raw materials comprising the following components based on 100 parts by weight of raw rubber: 70-90 parts natural rubber 10-30 parts of isoprene rubber 50-60 parts carbon black 1-2 parts of cobalt neodecanoate 1-5 parts of adhesive resin SL3020 BPRA-65 adhesive 4-8 parts Hardening resin SL2201 2-6 parts.

[0008] Preferably, the rubber composition further includes one or more of the following: insoluble sulfur, vulcanization accelerator, vulcanization activator, environmentally friendly oil, antioxidant, environmentally friendly plasticizer, dispersant, and anti-scorching agent.

[0009] Preferably, the rubber composition further comprises the following raw materials based on 100 parts by weight of raw rubber: 5-15 parts insoluble sulfur 1-5 parts of vulcanization accelerator 5-15 parts of indirect zinc oxide 0-10 parts of environmentally friendly oil Anti-aging agent 1-20 parts 1-5 parts of environmentally friendly plasticizer Dispersant 0.5-1.5 parts 0.5-1.5 parts of anti-scorching agent.

[0010] Preferably, the antioxidant is antioxidant RD and antioxidant 4020, wherein antioxidant RD is 1-10 parts and antioxidant 4020 is 1-10 parts.

[0011] Preferably, the carbon black used is N326; the insoluble sulfur used is OT-20; the accelerator used is DZ; the dispersant used is DS190; and the scorching inhibitor used is CTP.

[0012] Furthermore, the present invention also discloses a method for preparing the rubber composition, comprising the following steps: 1) First stage mixing: Add raw rubber to the internal mixer, set the rotor speed to 55 r / min, the rotor temperature control water temperature to 60℃, and the filling coefficient to 0.65. When the temperature of the internal mixer chamber reaches 55-65℃, start mixing; 25-35 seconds after adding the raw rubber, add 2 / 3 of the total filler and all fine materials except sulfur, accelerator, and environmentally friendly oil; 55-65 seconds after adding the raw rubber, add the remaining filler; when the internal mixer temperature rises to 105-115℃, add environmentally friendly oil; when the internal mixer temperature rises to 125-135℃, raise and lower the top bolt once for cleaning; when the internal mixer temperature rises to 145-155℃, discharge the rubber. 2) Two-stage mixing: Add the first stage material into the internal mixer, set the rotor speed to 55 r / min, the rotor temperature control water temperature to 60℃, and the filling coefficient to 0.65; start mixing when the internal mixer temperature reaches 55-65℃; when the internal mixer temperature rises to 125-135℃, raise and lower the top bolt once for cleaning; when the internal mixer temperature rises to 145-155℃, discharge the adhesive. 3) Three-stage mixing: After the two-stage rubber is mixed evenly on the open mill, sulfur and accelerator are added. It is then cut three times on each side, manually rolled and triangularly wrapped five times each before sheeting.

[0013] Furthermore, the present invention also discloses the application of the rubber composition in the preparation of heat-resistant and aging-resistant tire belt layers.

[0014] Furthermore, the present invention also discloses a steel wire belt layer fabric, which is prepared using the aforementioned rubber composition.

[0015] Furthermore, the present invention also discloses a tire in which the belt layer is obtained by vulcanizing the aforementioned steel wire belt layer cord fabric.

[0016] The beneficial effects of the present invention are as follows: The present invention uses adhesive resin SL3020, adhesive BPRA-65 and hardening resin SL2201 in compound. The adhesive resin SL3020 and adhesive BPRA-65 can form a three-dimensional network structure, and the hardening resin SL2201 can effectively enhance the network structure, thereby improving the adhesion performance between the belt rubber and the steel cord, the interlayer adhesion of the belt, and thus improving the heat resistance and aging resistance of the tire. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention. Example

[0018] The formulation of the belt layer rubber composition is shown in Table 1, and the preparation method is as follows: 1) First stage mixing: Add raw rubber to the internal mixer, set the rotor speed to 55 r / min, the rotor temperature control water temperature to 60℃, and the filling coefficient to 0.65. When the temperature of the internal mixer chamber reaches 60℃, start mixing; 30 seconds after adding raw rubber, add 2 / 3 of the total filler and all fine materials except sulfur, accelerator, and environmentally friendly oil; 60 seconds after adding raw rubber, add the remaining filler; when the internal mixer temperature rises to 110℃, add environmentally friendly oil; when the internal mixer temperature rises to 130℃, raise and lower the top bolt once for cleaning; when the internal mixer temperature rises to 150℃, discharge the rubber. 2) Two-stage mixing: Add the first stage material into the internal mixer, set the rotor speed to 55 r / min, the rotor temperature control water temperature to 60℃, and the filling coefficient to 0.65; start mixing when the internal mixer temperature reaches 60℃; when the internal mixer temperature rises to 130℃, raise and lower the top bolt once for cleaning; when the internal mixer temperature rises to 150℃, discharge the glue. 3) Three-stage mixing: After the two-stage rubber is mixed evenly on the open mill, sulfur and accelerator are added. It is then cut three times on each side, manually rolled and triangularly wrapped five times each before sheeting.

[0019] Comparative Example The formulation is shown in Table 1, and the preparation method is as described in the examples.

[0020] Parameter The formulation is shown in Table 1, and the preparation method is as described in the examples.

[0021] Table 1 natural rubber 80 80 80 80 80 80 80 80 80 Isoprene rubber 20 20 20 20 20 20 20 20 20 N326 50 50 60 55 55 55 55 55 55 Cobalt neodecanoate 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 SL3020 0 0 3.5 3.5 3.5 0 3.5 3.5 3.5 BPRA-65 0 6 0 6 0 6 6 6 6 SL2201 0 0 0 0 4 4 2 4 6 OT-20 10 10 10 10 10 10 10 10 10 Accelerator DZ 3 3 3 3 3 3 3 3 3 Indirect method for zinc oxide 10 10 10 10 10 10 10 10 10 Environmentally friendly oil 8 8 8 8 8 8 8 8 8 Anti-aging agent RD 5 5 5 5 5 5 5 5 5 Anti-aging agent 4020 5 5 5 5 5 5 5 5 5 Environmentally friendly plasticizers 2 2 2 2 2 2 2 2 2 DS190 1 1 1 1 1 1 1 1 1 CTP (Catalyst) 1 1 1 1 1 1 1 1 1 The above-mentioned belt layer rubber composition was used to prepare corresponding samples for the following tests.

[0022] Test 1 Steel pull-out adhesion tests were conducted under different vulcanization and aging conditions. The adhesion was determined by measuring the axial force of a single steel cord being pulled out of the embedded rubber from the prepared sample. The standard steel wire used was 3*0.38ST. All performance data were processed with reference performance as 100% for the examples and comparative examples. The specific results are shown in Table 2.

[0023] Table 2 Test 2 Peel adhesion tests were conducted on semi-finished cord fabrics under different vulcanization and aging conditions. The calendered semi-finished cord fabric was laid out on a test bench. Two pieces of fabric, each 230mm long and 150mm wide, were placed parallel to each other along the cord direction and pressed flat to remove air. Two layers of high-temperature release film, 30-40mm long, were embedded at either end of the sample to serve as clamping ends for the vulcanized sample. The sample was then placed in a vulcanization mold, and different vulcanization temperatures and times were set. The cord wire used was 3*0.38ST. All performance parameters were processed against the data of the examples and comparative examples, with the reference performance as 100%. Specific results are shown in Table 3. Table 3

[0024] Test 3 After dissecting the new tire and the tire after durability testing, the peel adhesion of the belt ply was determined by dissecting the tire and testing the adhesion of the belt ply in the finished tire. The tire specification was 185 / 75R16C and the belt steel wire used was 3*0.38ST. All performance data were processed with reference performance as 100% for the example and comparative data. The specific results are shown in Table 4.

[0025] Table 4 The test results above indicate that Example 2 is the optimal embodiment. Through the comparative and example examples, it can be seen that the scientifically formulated combination of SL3020 and BPRA-65, along with the addition of SL2201 hardening resin, can effectively improve the adhesion between the belt compound and the steel cord, as well as the interlayer adhesion of the belt, thereby enhancing the tire's heat resistance and aging resistance.

[0026] The foregoing description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A high-adhesion belt layer rubber composition, characterized in that, The rubber composition is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 80 parts of natural rubber, 20 parts of isoprene rubber, 55 parts of carbon black N326, 1.5 parts of cobalt neodecanoate, 3.5 parts of adhesive resin SL3020, 6 parts of adhesive BPRA-65, 4 parts of hardening resin SL2201, 10 parts of insoluble sulfur OT-20, 3 parts of accelerator DZ, 10 parts of indirect zinc oxide, 8 parts of environmentally friendly oil, 5 parts of antioxidant RD, 5 parts of antioxidant 4020, 2 parts of environmentally friendly plasticizer, 1 part of dispersant DS190, and 1 part of anti-scorching agent CTP.

2. The method for preparing the rubber composition according to claim 1, characterized in that, Includes the following steps: 1) First stage of mixing: Add raw rubber to the internal mixer, set the rotor speed to 55 r / min, the rotor temperature control water temperature to 60℃, and the filling coefficient to 0.

65. When the temperature of the internal mixer chamber reaches 55-65℃, start mixing; 25-35 seconds after adding the raw rubber, add 2 / 3 of the total filler and all fine materials except sulfur, accelerator, and environmentally friendly oil; 55-65 seconds after adding the raw rubber, add the remaining filler; when the internal mixer temperature rises to 105-115℃, add environmentally friendly oil; when the internal mixer temperature rises to 125-135℃, raise and lower the top bolt once for cleaning; when the internal mixer temperature rises to 145-155℃, discharge the rubber. 2) Two-stage mixing: Add the first stage material into the internal mixer, set the rotor speed to 55 r / min, the rotor temperature control water temperature to 60℃, and the filling coefficient to 0.65; start mixing when the internal mixer temperature reaches 55-65℃; when the internal mixer temperature rises to 125-135℃, raise and lower the top bolt once for cleaning; when the internal mixer temperature rises to 145-155℃, discharge the adhesive. 3) Three-stage mixing: After the two-stage rubber is mixed evenly on the open mill, sulfur and accelerator are added. It is then cut three times on each side, manually rolled and triangularly wrapped five times each before sheeting.

3. The application of the rubber composition of claim 1 in the preparation of heat-resistant and aging-resistant tire belt layers.

4. A steel wire belt layer fabric, wherein the belt layer fabric is prepared using the rubber composition of claim 1.

5. A tire, characterized in that, The belt layer of the tire is obtained by vulcanizing the steel belt ply fabric as described in claim 4.

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