Cap strip suitable for new energy automobile tire
By adding appropriate proportions of Vestenamer-8012 and other components to the crown strip formula and adopting a reasonable mixing process, the problem of over-stick or non-stick rubber during the production and use of crown strips is solved, and the stable self-adhesion and efficient utilization of the rubber are achieved.
Patent Information
- Application Number
- CN202510053953.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-04-18
AI Technical Summary
During the production and use of existing crown strips, the glue is prone to overstick or non-stick in the rubber, which affects the production efficiency and material utilization rate.
A new crown strip formula is adopted, including 70-90 parts of natural glue, 2-12 parts of Vestenamer-8012, 10-30 parts of styrene butadiene glue, 40-60 parts of N326 carbon black, 4-8 parts of environmentally friendly oil, 0-2.5 parts of adhesion promoting resin A250, 0-3 parts of hexamethoxymethylmeeramine HMMM, 0-2 parts of sulfur, 2-7 parts of zinc oxide, 1-2 parts of stearic acid, 1.8-4 parts of anti-aging agent, 0.5-2 parts of accelerator, 1-5 parts of insoluble sulfur OT20, 0.1-0.4 parts of anti-coking agent. Through reasonable component ratios and mixing processes, the self-adhesion of the glue is controlled within a stable and moderate range.
It effectively improves the adhesion between the adhesive material and the aramid blended cord, controls the self-adhesion of the crown strip, avoids the problem of over-stickness or non-stick spraying, and ensures the stability of production and the effective utilization of materials.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of tires, and in particular to a cap strip suitable for tires of new energy vehicles. Background Art
[0002] To meet the requirements of environmental protection, the number of electric vehicles has increased rapidly. Electric vehicles are heavy and the load pressure on tires is high, especially when starting and braking, which will produce a strong torque impact. The crown strip component on the inner side of the tire crown is used to wrap and tighten the steel belt layer in the high-speed tire, reduce the expansion of the tire during use, keep it rigid under high speed and high stress, improve durability, and reduce the risk of tire damage. In order to improve the driving safety of electric vehicles, the skeleton material of the crown strip component uses aramid blended cord fabric instead of the original nylon 66 cord fabric, because the former has the advantages of high modulus and high strength, which can improve the high-speed performance and handling performance of the tire.
[0003] In the production of the crown band, industrial fiber is first used as the skeleton material, which is covered with a special formula rubber after calendering to form a large roll of rubber-coated curtain cloth. When it is rolled up, there is a polypropylene pad as isolation; then it is cut longitudinally into small rolls of curtain cloth, and then divided into crown bands by a slitting machine and wound into rolls. There is no isolation pad after longitudinal cutting and slitting, so the crown band rubber material may occasionally become too sticky or non-sticky after spraying frost when the seasons change or the conditions of each process fluctuate, affecting production and causing waste.
[0004] Since aramid cord is expensive, the above-mentioned over-stickiness or non-stickiness of the crown strip must be eliminated. Therefore, it is urgent to design a new crown strip formula that can maintain adhesion with the skeleton material and control the moderate self-adhesion of the rubber material to ensure smooth production and reduce material waste. Summary of the invention
[0005] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide a cap strip suitable for new energy vehicle tires, which can ensure its physical properties, improve the adhesion between the rubber and the aramid blended cord, and control a stable and moderate degree of self-adhesion during the production and use of the cap strip to avoid problems such as over-adhesion or frosting due to changes in storage conditions and process fluctuations.
[0006] The technical solution of the present invention is:
[0007] The cap strip suitable for new energy vehicle tires includes the following components in parts by weight: 70-90 parts of natural rubber, 2-12 parts of Vestenamer-8012, 10-30 parts of styrene-butadiene rubber, 40-60 parts of N326 carbon black, 4-8 parts of environmentally friendly oil, 0-2.5 parts of adhesion promoting resin A250, 0-3 parts of hexamethoxymethylmelamine HMMM, 0-2 parts of sulfur, 2-7 parts of zinc oxide, 1-2 parts of stearic acid, 1.8-4 parts of antioxidant, 0.5-2 parts of accelerator, 1-5 parts of insoluble sulfur OT20, and 0.1-0.4 parts of anti-scorch agent.
[0008] Preferably, the following components are included in parts by weight: 80 parts of natural rubber, 3 parts of Vestenamer-8012, 17 parts of styrene-butadiene rubber, 54 parts of N326 carbon black, 5 parts of environmentally friendly oil, 1.3 parts of sulfur, 6 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of antioxidant, 0.7 parts of accelerator, 1.8 parts of insoluble sulfur OT20, and 0.15 parts of anti-scorch agent.
[0009] Preferably, the following components are included in parts by weight: 80 parts of natural rubber, 7 parts of Vestenamer-8012, 10 parts of styrene-butadiene rubber, 51 parts of N326 carbon black, 5 parts of environmentally friendly oil, 2 parts of adhesion promoting resin A250, 2.5 parts of hexamethoxymethyl melamine, 6 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of antioxidant, 0.8 parts of accelerator, 3.2 parts of insoluble sulfur OT20, and 0.15 parts of anti-scorch agent.
[0010] Preferably, the following components are included in parts by weight: 80 parts of natural rubber, 10 parts of Vestenamer-8012, 10 parts of styrene-butadiene rubber, 48 parts of N326 carbon black, 5 parts of environmentally friendly oil, 2 parts of adhesion promoting resin A250, 2.5 parts of hexamethoxymethyl melamine, 6 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of antioxidant, 0.9 parts of accelerator, 3.2 parts of insoluble sulfur OT20, and 0.15 parts of anti-scorch agent.
[0011] Preferably, the antioxidant includes 0.8-1.5 parts of antioxidant TMQ and 1-2.5 parts of antioxidant 6PPD.
[0012] Preferably, the accelerator is accelerator TBBS.
[0013] Preferably, the anti-scorch agent is anti-scorch agent PVI.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] In the cap band of the present invention, the added Vestenamer-8012 is a synthetic trans-polyoctene rubber, whose internal structure is a ring-shaped macromolecule entangled with a linear rubber molecule, and it can be inferred that the mixed rubber has excellent deformation resistance; and its giant molecule has no terminal functional group, and the linear molecule has no branching structure, and the raw rubber viscosity of the mixed rubber is easy to stably control. The cap band of the present invention suitable for new energy vehicle tires can ensure its physical properties, improve the adhesion between the rubber and the aramid blended cord, and control the stable and moderate self-adhesion degree during the production and use of the cap band, avoiding the problem of over-adhesion or frosting due to changes in storage conditions and process fluctuations. DETAILED DESCRIPTION
[0016] In order to enable persons skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.
[0017] Examples 1-3
[0018] The formulas of the cap strips suitable for new energy vehicle tires of Examples 1-3 and Comparative Example 1 are shown in Table 1:
[0019] Table 1 Formulas of cap strips suitable for new energy vehicle tires of Examples 1-3 and Comparative Example 1
[0020] Comparative Example 1 Example 1 Example 2 Example 3 SMR20 80 80 80 80 SBR1502 20 17 13 10 Vestenamer-8012 - 3 7 10 N326 57 54 51 48 Environmentally friendly oil TDAE 5 5 5 5 ZnO 6 6 6 6 Stearic acid 1.5 1.5 1.5 1.5 TMQ 1 1 1 1 6PPD 1 1 1 1 Adhesion promoting resin A250 - - 2 2 S 1.3 1.3 - - OT20 1.8 1.8 3.2 3.2 HMMM (RA-65%) - - 2.5 2.5 TBBS 0.7 0.7 0.8 0.9 PVI 0.15 0.15 0.15 0.15
[0021] The preparation method of the cap strip suitable for new energy vehicle tires of Examples 1-3 is as follows:
[0022] (1) The mixing was carried out using a 1.5 L tangent type internal mixer with a filling factor of 0.7 and a rotor speed of 55 r / min;
[0023] (2) The mixing process of the masterbatch is as follows: adding SMR20, SBR1502 and Vestenamer-8012 and mixing for 30 seconds, adding N326 carbon black, ZnO, stearic acid, antioxidant TMQ, antioxidant 6PPD and adhesion promoting resin A250, mixing to 110°C, cleaning the pressure roller, adding an environmentally friendly oil pressure roller, mixing to 160°C for rubber removal, and unrolling the sheet on an open mill to obtain a masterbatch;
[0024] (3) The mixing process of the final rubber mix is as follows: adding the masterbatch and the accelerator TBBS, sulfur, insoluble sulfur OT20, scorch retarder PVI and HMMM, mixing to 105°C for rubber discharge, unloading the sheet on an open mixing mill, and obtaining the final rubber mix.
[0025] The physical properties of the cap strip formulation rubber materials suitable for new energy vehicle tires of Examples 1-3 and Comparative Example 1 were tested, and the test results are shown in Table 2:
[0026] Table 2 Physical property test results of the cap strip rubber material suitable for new energy vehicle tires of Examples 1-3 and Comparative Example 1
[0027]
[0028]
[0029] It can be seen from Table 2 that the physical properties of the cap bands of Examples 1-3 of the present invention are close to those of the cap bands of Comparative Example 1, and the rubber and fiber bonding strength of the cap bands of Examples 2-3 is improved compared with Comparative Example 1. Since aramid cords and Vestenamer-8012 are expensive, Example 2 is preferred for bulk material preparation and finished tire trial production in consideration of both physical properties and cost.
[0030] Take 6 pieces of 6cm×10cm small roll cord fabrics of Example 2 and Comparative Example 1, and conduct self-adhesion tests at different parking times and temperatures. The instrument used for the test is the Toyo Seiki HTC-1 viscosity tester. According to experience, when the self-adhesion test value is lower than 1.2, the tire is prone to insufficient adhesion during molding, affecting the performance of the tire; when the self-adhesion test value is higher than 1.8, the crown strip is too sticky during tire molding and cannot be unwound and used; when the self-adhesion test value of the rubber is between 1.2-1.8, the self-adhesion of the crown strip is moderate, the process is stable, and it can be smoothly used for tire molding without waste. The test results are shown in Table 3:
[0031] Table 3 Self-adhesive test results of small rolling curtain fabrics of Example 2 and Comparative Example 1
[0032]
[0033] The small roller blind fabrics of Example 2 and Comparative Example 1 were cut, and the cut crown bands were compared. Six cut crown band samples with a length of 30 cm were taken for self-adhesion tests at different parking times and temperatures. The test results are shown in Table 4:
[0034] Table 4 Self-adhesiveness test results of the crown strip samples of Example 2 and Comparative Example 1
[0035]
[0036] It can be seen from Tables 3-4 that the cap strip of Example 2 of the present invention is in good condition under various parking conditions and meets the requirements. In addition, tracking the use process of the cap strip of Example 2, it is found that it can be smoothly produced and used for tire molding without waste caused by frost spraying and over-sticking.
[0037] Tires were trial-produced with the cap strips of Example 2 and Comparative Example 1, and performance tests were performed on them. The test results are shown in Table 5. The tests were performed in accordance with GB / T 4502-2023.
[0038] Table 5 Tire performance test results of the crown strip trial production of Example 2 and Comparative Example 1
[0039] Tire model: 215 / 45R17 91W XL Comparative Example 1 Example 2 Low pressure endurance test results (h) 34+1.5+32(damaged) 34+1.5+50(undamaged) High-speed test results (km / h×min) Maximum speed: 300×8 (damaged) Maximum speed: 310×7 (damaged)
[0040] It can be seen from Table 5 that the high-speed test results of the tire produced with the cap strip of Example 2 of the present invention are close to those of the tire produced with the existing cap strip of Comparative Example 1, but its low-pressure endurance test results are slightly better than those of the tire produced with the existing cap strip.
Claims
1. Applicable to the cap strip of new energy vehicle tires, characterized in that: The invention comprises the following components in parts by weight: 70-90 parts of natural rubber, 2-12 parts of Vestenamer-8012, 10-30 parts of styrene-butadiene rubber, 40-60 parts of N326 carbon black, 4-8 parts of environmentally friendly oil, 0-2.5 parts of adhesion promoting resin A250, 0-3 parts of hexamethoxymethyl melamine, 0-2 parts of sulfur, 2-7 parts of zinc oxide, 1-2 parts of stearic acid, 1.8-4 parts of antioxidant, 0.5-2 parts of accelerator, 1-5 parts of insoluble sulfur OT20 and 0.1-0.4 parts of anti-scorch agent.
2. The cap strip suitable for new energy vehicle tires according to claim 1, characterized in that: The invention comprises the following components in parts by weight: 80 parts of natural rubber, 3 parts of Vestenamer-8012, 17 parts of styrene-butadiene rubber, 54 parts of N326 carbon black, 5 parts of environmentally friendly oil, 1.3 parts of sulfur, 6 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of antioxidant, 0.7 parts of accelerator, 1.8 parts of insoluble sulfur OT20 and 0.15 parts of anti-scorch agent.
3. The cap strip suitable for new energy vehicle tires according to claim 1, characterized in that: The invention comprises the following components in parts by weight: 80 parts of natural rubber, 7 parts of Vestenamer-8012, 10 parts of styrene-butadiene rubber, 51 parts of N326 carbon black, 5 parts of environmentally friendly oil, 2 parts of adhesion promoting resin A250, 2.5 parts of hexamethoxymethyl melamine, 6 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of antioxidant, 0.8 parts of accelerator, 3.2 parts of insoluble sulfur OT20 and 0.15 parts of anti-scorch agent.
4. The cap strip suitable for new energy vehicle tires according to claim 1, characterized in that: The invention comprises the following components in parts by weight: 80 parts of natural rubber, 10 parts of Vestenamer-8012, 10 parts of styrene-butadiene rubber, 48 parts of N326 carbon black, 5 parts of environmentally friendly oil, 2 parts of adhesion promoting resin A250, 2.5 parts of hexamethoxymethyl melamine, 6 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of antioxidant, 0.9 parts of accelerator, 3.2 parts of insoluble sulfur OT20 and 0.15 parts of anti-scorch agent.
5. The cap strip suitable for new energy vehicle tires according to any one of claims 1 to 4, characterized in that: The antioxidant includes 0.8-1.5 parts of antioxidant TMQ and 1-2.5 parts of antioxidant 6PPD.
6. The cap strip suitable for new energy vehicle tires according to any one of claims 1 to 4, characterized in that: The accelerator is accelerator TBBS.
7. The cap strip suitable for new energy vehicle tires according to any one of claims 1 to 4, characterized in that: The anti-scorch agent is anti-scorch agent PVI.