Shock absorber strut mount rubber composition as well as preparation method therefor and use thereof

Abstract

Disclosed in the present invention are a shock absorber strut mount rubber composition as well as a preparation method therefor and the use thereof. The rubber composition comprises natural rubber, zinc oxide, stearic acid, a processing flow aid, an internal release agent, N330 high-wear-resistance carbon black, N774 semi-reinforced carbon black, naphthenic oil, microcrystalline wax, light calcium carbonate, sulfur, an accelerant CZ and an accelerant TMTD. The present invention solves the problems of high costs and insufficient fatigue resistance of existing shock absorber strut mount rubber formulas.

Description

A shock absorber top glue rubber composition and its preparation method and application Technical Field

[0001] The present invention relates to the field of top rubber vibration isolation blocks (rubber vulcanization) at the upper ends of shock absorbers of fuel vehicles and new energy vehicles, and in particular to a shock absorber top rubber composition, a preparation method and applications thereof. Background Art

[0002] Shock absorbers are widely used in the automotive industry because they suppress the oscillations caused by springs rebounding after absorbing shock, as well as impacts from the road. Shock absorber components rub against each other and are prone to wear, so the top rubber plays an important role as the spring base at the top of the shock absorber assembly. The intermolecular interactions in the shock absorber's top rubber material hinder the movement of the molecular chains, and its stress and strain are often in an unbalanced state, resulting in strong viscoelastic damping properties. Therefore, the shock absorber's top rubber can reduce the impact force experienced by the shock absorber during operation, providing cushioning, shock absorption, and sound insulation. Existing shock absorber top rubber formulas are expensive and lack fatigue resistance.

[0003] Therefore, providing a rubber composition and a preparation method thereof that can be effectively applied to shock absorber top glue, reduce costs and improve anti-fatigue effect is an urgent problem to be solved by the present invention.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to provide a shock absorber top rubber composition and its preparation method and application, so as to solve the problems of the existing shock absorber top rubber formula, which is high in cost and has insufficient fatigue resistance.

[0006] In order to achieve the above-mentioned object, the present invention provides a shock absorber top glue rubber composition, which includes natural rubber, zinc oxide, stearic acid ester, processing flow aid, internal mold release agent, N330 high wear-resistant carbon black, N774 semi-reinforcing carbon black, naphthenic oil, microcrystalline wax, light calcium carbonate, sulfur, accelerator CZ, and accelerator TMTD.

[0007] In a preferred embodiment of the present invention, in order to further improve the fatigue resistance of the rubber composition, relative to 100 parts by weight of natural rubber, the content of zinc oxide is 3-10 parts by weight, the content of stearate is 0.5-3 parts by weight, the content of processing flow aid is 0.5-2 parts by weight, the content of internal release agent is 0.5-3 parts by weight, the content of N330 high wear-resistant carbon black is 30-60 parts by weight, the content of N774 semi-reinforcing carbon black is 40-75 parts by weight, the content of cyclohexane oil is 35-55 parts by weight, the content of microcrystalline wax is 1-10 parts by weight, the content of light calcium carbonate is 10-40 parts by weight, the content of sulfur is 0.2-1.5 parts by weight, the content of accelerator CZ is 1-2 parts by weight, and the content of accelerator TMTD is 0.1-0.2 parts by weight.

[0008] In a preferred embodiment of the present invention, in order to further improve the fatigue resistance of the rubber composition, relative to 100 parts by weight of natural rubber, the content of zinc oxide is 5 parts by weight, the content of stearate is 1.5 parts by weight, the content of processing flow aid is 2 parts by weight, the content of internal release agent is 2 parts by weight, the content of N330 high wear-resistant carbon black is 40 parts by weight, the content of N774 semi-reinforcing carbon black is 30 parts by weight, the content of cyclohexane oil is 7 parts by weight, the content of microcrystalline wax is 2 parts by weight, the content of light calcium carbonate is 30 parts by weight, the content of sulfur is 2.5 parts by weight, the content of accelerator CZ is 1 part by weight, and the content of accelerator TMTD is 0.2 parts by weight.

[0009] The present invention also provides a method for preparing the rubber composition as described above, the preparation method comprising:

[0010] 1) Use an internal mixer to mix the natural rubber;

[0011] 2) mixing the rubber obtained in step (1) with zinc oxide, stearate, processing flow aid, internal release agent and microcrystalline wax and performing the first mixing;

[0012] 3) Then add N330 high wear-resistant carbon black and light calcium carbonate for the second mixing;

[0013] 4) Then add N774 semi-reinforced carbon black and light calcium carbonate for the third mixing; finally add naphthenic oil and stop after the mixing is completed;

[0014] 5) Add sulfur, accelerator CZ and accelerator TMTD to the obtained rubber mixture for vulcanization treatment and thin-pass treatment.

[0015] In a preferred embodiment of the present invention, in order to further improve the fatigue resistance of the rubber composition, in step (1), the material is discharged after being banburying at 140-150° C. and then left to stand for 20-24 hours.

[0016] In a preferred embodiment of the present invention, in order to further improve the fatigue resistance of the rubber composition, the conditions of the first mixing include: a mixing temperature of 100-120° C., and a mixing time of 2-3 minutes.

[0017] In a preferred embodiment of the present invention, in order to further improve the fatigue resistance of the rubber composition, the conditions of the second mixing include: mixing temperature of 90-100° C., and mixing time of 2-3 minutes.

[0018] In a preferred embodiment of the present invention, in order to further improve the fatigue resistance of the rubber composition, the conditions of the third mixing include: mixing temperature of 80-90° C., and mixing time of 2-3 minutes.

[0019] The present invention also provides a rubber composition as described above for use in a shock absorber top rubber.

[0020] The present invention provides a shock absorber top glue rubber composition, which includes natural rubber, zinc oxide, stearic acid ester, a processing flow aid, an internal release agent, N330 high wear-resistant carbon black, N774 semi-reinforced carbon black, naphthenic oil, microcrystalline wax, light calcium carbonate, sulfur, accelerator CZ, and accelerator TMTD. The processing flow aid is a processing flow aid with the brand L-24, and the internal release agent is a demoulding machine with the brand Modli 985P. In the provided rubber composition, highly wear-resistant N330 high wear-resistant carbon black and N774 semi-reinforced carbon black are selected, and light calcium carbonate is used in combination, which not only reduces the production cost of the rubber composition, but also effectively improves the wear resistance of the rubber. Through the synergistic effect between the components, the heat-oxidative aging resistance and dynamic fatigue performance of the rubber product are effectively increased. The rubber composition has good mixing fluidity, is easy to vulcanize and process, has a high pass rate, and the finished product has good comprehensive performance and fatigue resistance; the mechanical properties, fatigue properties, aging resistance, low heat generation and other properties are relatively high, and is suitable for the production of shock-absorbing and vibration-isolating blocks, buffer blocks and other rubber shock-absorbing products for automobiles that require flame retardancy for new energy.

[0021] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0022] The following is a detailed description of the specific embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0023] Example 1

[0024] The natural rubber was mixed in an internal mixer until the temperature reached 140°C and then discharged. The mixture was then left standing for 20 hours. The obtained rubber was mixed with zinc oxide, stearic acid, processing flow aid, internal release agent and microcrystalline wax and mixed for the first time (temperature was 100°C and mixing time was 2 minutes). N330 high wear-resistant carbon black and light calcium carbonate were then added for the second mixing (temperature was 90°C and mixing time was 2 minutes). N774 semi-reinforcing carbon black and light calcium carbonate were then added for the third mixing (temperature was 80°C and mixing time was 2 minutes). Finally, cyclohexane oil was added and the mixture was left standing after mixing was completed. Sulfur, accelerator CZ and accelerator TMTD were added to the obtained mixed rubber for vulcanization treatment and thin-pass treatment. Relative to 100 parts by weight of natural rubber, the content of zinc oxide is 3 parts by weight, the content of stearate is 0.5 parts by weight, the content of processing flow aid is 0.5 parts by weight, the content of internal release agent is 0.5 parts by weight, the content of N330 high wear-resistant carbon black is 30 parts by weight, the content of N774 semi-reinforcing carbon black is 40 parts by weight, the content of cyclohexane oil is 35 parts by weight, the content of microcrystalline wax is 1 part by weight, the content of light calcium carbonate is 10 parts by weight, the content of sulfur is 0.2 parts by weight, the content of accelerator CZ is 1 part by weight, and the content of accelerator TMTD is 0.1 part by weight.

[0025] Example 2

[0026] The natural rubber was mixed in an internal mixer until the temperature reached 150°C and then discharged. The mixture was then left standing for 24 hours. The obtained rubber was mixed with zinc oxide, stearic acid, processing flow aid, internal release agent and microcrystalline wax and mixed for the first time (temperature was 120°C and mixing time was 3 minutes). N330 high wear-resistant carbon black and light calcium carbonate were then added for the second mixing (temperature was 100°C and mixing time was 3 minutes). N774 semi-reinforcing carbon black and light calcium carbonate were then added for the third mixing (temperature was 90°C and mixing time was 3 minutes). Finally, cyclohexane oil was added and the mixture was left standing after mixing was completed. Sulfur, accelerator CZ and accelerator TMTD were added to the obtained mixed rubber for vulcanization treatment and thin-pass treatment. Relative to 100 parts by weight of natural rubber, the content of zinc oxide is 10 parts by weight, the content of stearate is 3 parts by weight, the content of processing flow aid is 2 parts by weight, the content of internal release agent is 3 parts by weight, the content of N330 high wear-resistant carbon black is 60 parts by weight, the content of N774 semi-reinforcing carbon black is 75 parts by weight, the content of cyclohexane oil is 55 parts by weight, the content of microcrystalline wax is 10 parts by weight, the content of light calcium carbonate is 40 parts by weight, the content of sulfur is 1.5 parts by weight, the content of accelerator CZ is 2 parts by weight, and the content of accelerator TMTD is 0.2 parts by weight.

[0027] Example 3

[0028] The natural rubber was mixed in an internal mixer until the temperature reached 145°C and then discharged. The mixture was then left standing for 22 hours. The obtained rubber was mixed with zinc oxide, stearic acid, processing flow aid, internal release agent and microcrystalline wax and mixed for the first time (temperature was 110°C and mixing time was 2 minutes). N330 high wear-resistant carbon black and light calcium carbonate were then added for the second mixing (temperature was 95°C and mixing time was 2 minutes). N774 semi-reinforcing carbon black and light calcium carbonate were then added for the third mixing (temperature was 85°C and mixing time was 2 minutes). Finally, cyclohexane oil was added and the mixture was left standing after mixing was completed. Sulfur, accelerator CZ and accelerator TMTD were added to the obtained mixed rubber for vulcanization treatment and thin-pass treatment. Relative to 100 parts by weight of natural rubber, the content of zinc oxide is 5 parts by weight, the content of stearate is 1.5 parts by weight, the content of processing flow aid is 2 parts by weight, the content of internal release agent is 2 parts by weight, the content of N330 high wear-resistant carbon black is 40 parts by weight, the content of N774 semi-reinforcing carbon black is 30 parts by weight, the content of cyclohexane oil is 7 parts by weight, the content of microcrystalline wax is 2 parts by weight, the content of light calcium carbonate is 30 parts by weight, the content of sulfur is 2.5 parts by weight, the content of accelerator CZ is 1 part by weight, and the content of accelerator TMTD is 0.2 parts by weight.

[0029] Test example

[0030] The rubber compositions prepared in Examples 1-3 were tested, and the test results were consistent with the tensile strength and elongation test of GB / T528, the hot air aging test of GB / T3512-2014, the low-temperature brittleness test of GB / T1682-2014, and the high-temperature storage resistance (placed in an aging box at 80°C, and the product had no cracks after 24 hours of testing). In the fatigue test, the isolation block assembly was fixed on the test bench with a special clamp and locked, and a force F was applied in the direction of simulated loading force, F: ±3000N, frequency: 3HZ, and the test was performed 1 million times. There was no cracking or damage on the rubber in various parts. The test showed that the fatigue performance of the rubber composition was 30-100% higher than that of similar products.

[0031] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0032] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0033] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A shock absorber top rubber composition, It is characterized in that The rubber composition comprises natural rubber, zinc oxide, stearate, processing flow aid, internal mold release agent, N330 high wear-resistant carbon black, N774 semi-reinforced carbon black, cyclohexane oil, microcrystalline wax, light calcium carbonate, sulfur, accelerator CZ, and accelerator TMTD.

2. The rubber composition according to claim 1, in, Relative to 100 parts by weight of natural rubber, the content of zinc oxide is 3-10 parts by weight, the content of stearate is 0.5-3 parts by weight, the content of processing flow aid is 0.5-2 parts by weight, the content of internal release agent is 0.5-3 parts by weight, the content of N330 high wear-resistant carbon black is 30-60 parts by weight, the content of N774 semi-reinforcing carbon black is 40-75 parts by weight, the content of cyclohexane oil is 35-55 parts by weight, the content of microcrystalline wax is 1-10 parts by weight, the content of light calcium carbonate is 10-40 parts by weight, the content of sulfur is 0.2-1.5 parts by weight, the content of accelerator CZ is 1-2 parts by weight, and the content of accelerator TMTD is 0.1-0.2 parts by weight.

3. The rubber composition according to claim 2, in, Relative to 100 parts by weight of natural rubber, the content of zinc oxide is 5 parts by weight, the content of stearate is 1.5 parts by weight, the content of processing flow aid is 2 parts by weight, the content of internal release agent is 2 parts by weight, the content of N330 high wear-resistant carbon black is 40 parts by weight, the content of N774 semi-reinforcing carbon black is 30 parts by weight, the content of cyclohexane oil is 7 parts by weight, the content of microcrystalline wax is 2 parts by weight, the content of light calcium carbonate is 30 parts by weight, the content of sulfur is 2.5 parts by weight, the content of accelerator CZ is 1 part by weight, and the content of accelerator TMTD is 0.2 parts by weight.

4. A method for preparing a rubber composition as claimed in any one of claims 1 to 3, It is characterized in that The preparation method comprises: 1) Use an internal mixer to mix the natural rubber; 2) mixing the rubber obtained in step (1) with zinc oxide, stearate, processing flow aid, internal release agent and microcrystalline wax and performing the first mixing; 3) Then add N330 high wear-resistant carbon black and light calcium carbonate for the second mixing; 4) Then add N774 semi-reinforced carbon black and light calcium carbonate for the third mixing; finally add cyclohexane oil and stop after mixing; 5) Add sulfur, accelerator CZ and accelerator TMTD to the obtained rubber mixture for vulcanization treatment and thin pass treatment.

5. The preparation method according to claim 4, It is characterized in that In step (1), the mixture is mixed at 140-150°C and then discharged, and then left to stand for 20-24 hours.

6. The preparation method according to claim 4, It is characterized in that The conditions for the first mixing include: mixing temperature of 100-120° C., and mixing time of 2-3 min.

7. The preparation method according to claim 4, It is characterized in that The conditions for the second mixing include: mixing temperature of 90-100° C., and mixing time of 2-3 min.

8. The preparation method according to claim 4, It is characterized in that The conditions for the third mixing include: mixing temperature of 80-90° C., and mixing time of 2-3 min.

9. A rubber composition as claimed in any one of claims 1 to 3 used in a shock absorber top rubber.