Wearable EPDM (Ethylene-Propylene-Diene Monomer) rubber compound based on bio-based EPDM

Abstract

The invention relates to the technical field of mixed rubber, in particular to a wearable EPDM (ethylene-propylene-diene monomer) mixed rubber based on bio-based EPDM (ethylene-propylene-diene monomer), which comprises the following components: bio-based EPDM, precipitated silica, filler, polyisobutene, zinc stearate, poly-3-hydroxyalkanoate, bio-based furan polyester, a processing aid, a TAIC (triallyl isocyanurate) cross-linking agent and 2, 5-bis (tert-butylperoxy) hexane. The poly (3-hydroxyalkanoate) is short-chain PHA (polyhydroxyalkanoate) or medium-long-chain PHA; the preparation method of the EPDM rubber compound comprises the following steps: S1, raw rubber plastication; s2, rubber material mixing; s3, sheet discharging; and S4, carrying out secondary plastication. The bio-based EPDM is used as a matrix material, more crosslinking points are formed among rubber molecular chains through a reasonable mixing process, the compactness and oil resistance of the rubber are enhanced, sufficient vulcanization of the rubber is ensured, and the prepared EPDM rubber compound has excellent oil resistance and is suitable for intelligent wearable equipment.

Description

Technical Field

[0001] The invention relates to the technical field of mixed rubber, in particular to a wearable EPDM mixed rubber based on bio-based EPDM. Background Art

[0002] Ordinary EPDM (ethylene propylene diene monomer) comes from fossil raw materials and is obtained by polymerizing ethylene propylene diene produced by petroleum cracking. Bio-based EPDM raw materials come from sugar cane, which is then used to produce sucrose, which is then used to make ethanol, which is then used to make ethylene, and finally polymerized into EPDM, which reduces the carbon footprint and dependence on oil, is recyclable, and is green and environmentally friendly. The EPDM main chain is saturated, and its macromolecules are very stable and flexible, so it has excellent aging resistance, heat resistance, oxygen, ozone, ultraviolet rays, outdoor aging and other properties, and has excellent elasticity.

[0003] EPDM rubber is not resistant to oils and is easily corroded and damaged by various oils. In the wearable field, if wearable devices need to be in contact with grease, cosmetics or certain detergents for a long time, this may accelerate the aging and damage of the rubber and shorten its service life. Summary of the invention

[0004] The object of the present invention is to provide a wearable EPDM compound based on bio-based EPDM to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a wearable EPDM rubber compound based on bio-based EPDM, the EPDM rubber compound comprising the following components in parts by weight: 100 parts of bio-based EPDM, 15-30 parts of precipitated silica, 15-30 parts of filler, 5-15 parts of polyisobutylene, 2-10 parts of zinc stearate, 5-15 parts of poly 3-hydroxyalkanoate, 5-15 parts of bio-based furan polyester, 0.5-3 parts of processing aid, 0.5-3 parts of TAIC cross-linking agent, and 0.5-3 parts of dipentadienyl vulcanizer; the poly 3-hydroxyalkanoate is a short-chain PHA or a medium-long chain PHA; the preparation method of the EPDM rubber compound comprises the following steps:

[0006] S1. Raw rubber plasticizing: set the roller temperature of the internal mixer to 140-145°C, the roller speed of the internal mixer to 20-30 rpm, and put the bio-based EPDM into the internal mixer for breaking and kneading for 80-100 seconds;

[0007] S2, mixing rubber material: adding precipitated silica, filler, polyisobutylene, zinc stearate, poly 3-hydroxyalkanoate, bio-based furan polyester, and processing aid into an internal mixer in sequence, mixing and kneading for 10 to 15 minutes, and discharging to obtain a mixed rubber material;

[0008] S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 80-90°C for 5-8 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber;

[0009] S4, secondary plasticizing: set the roller temperature of the internal mixer to 100-105°C, the roller speed of the internal mixer to 20-30rpm, add TAIC crosslinking agent and dipentadienyl vulcanizing agent in sequence, first cool the primary rubber for 48h and then put it into the internal mixer for kneading for 3-5min, then put it into an open mixer for refining at 80-90°C for 5-8min, then filter, and finally put it into a tablet press for calendering to obtain the EPDM rubber mixture.

[0010] Optionally, the bio-based EPDM is one of Alanxinco's bio-based EPDM5470, Alanxinco's bio-based EPDM6570, and Alanxinco's bio-based EPDM6950, or a combination of more than one of them.

[0011] Optionally, the filler is highly dispersed precipitated silica and chloride-process titanium dioxide, and the mass ratio of highly dispersed precipitated silica to chloride-process titanium dioxide is 1:1.

[0012] Optionally, the processing aid is Disperagtor FL or Mediaplast 40.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts bio-based EPDM as the matrix material, and through a reasonable mixing process, more cross-linking points are formed between the rubber molecular chains, thereby enhancing the density and oil resistance of the rubber, ensuring that the rubber is fully vulcanized, and the prepared EPDM mixed rubber has excellent oil resistance and is suitable for smart wearable devices. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Example 1: The present invention provides a wearable EPDM compound based on bio-based EPDM, the EPDM compound comprising the following components in parts by weight: 100 parts of bio-based EPDM, 15 parts of precipitated silica, 15 parts of filler, 5 parts of polyisobutylene, 2 parts of zinc stearate, 5 parts of poly 3-hydroxyalkanoate, 5 parts of bio-based furan polyester, 0.5 parts of processing aid, 0.5 parts of TAIC cross-linking agent, and 0.5 parts of dipentadienyl vulcanizer.

[0016] The preparation method of EPDM rubber compound comprises the following steps:

[0017] S1. Raw rubber plasticizing: set the roller temperature of the internal mixer to 140°C and the roller speed of the internal mixer to 20 rpm, and put the bio-based EPDM into the internal mixer for breaking and kneading for 80 seconds;

[0018] S2, mixing rubber material: adding precipitated silica, filler, polyisobutylene, zinc stearate, poly 3-hydroxyalkanoate, bio-based furan polyester, and processing aid into an internal mixer in sequence, mixing and kneading for 10 minutes, and discharging to obtain a mixed rubber material;

[0019] S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 80°C for 5 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber;

[0020] S4. Secondary plasticizing: set the roller temperature of the internal mixer to 100°C and the roller speed of the internal mixer to 20rpm, add TAIC crosslinking agent and dipentadienyl vulcanizing agent in sequence, first cool the primary rubber for 48h and then put it into the internal mixer for kneading for 3min, then put it into an open mixer for refining at 80°C for 5min, then filter it, and finally put it into a tablet press for calendering to obtain EPDM mixed rubber.

[0021] Example 2: The present invention provides a wearable EPDM compound based on bio-based EPDM, the EPDM compound comprising the following components in parts by weight: 100 parts of bio-based EPDM, 20 parts of precipitated silica, 20 parts of filler, 10 parts of polyisobutylene, 6 parts of zinc stearate, 10 parts of poly 3-hydroxyalkanoate, 10 parts of bio-based furan polyester, 1 part of processing aid, 1 part of TAIC cross-linking agent, and 1 part of dipentadienyl vulcanizer.

[0022] The preparation method of EPDM rubber compound comprises the following steps:

[0023] S1. Raw rubber plasticizing: set the roller temperature of the internal mixer to 142°C and the roller speed of the internal mixer to 24 rpm, and put the bio-based EPDM into the internal mixer for rubber breaking and kneading for 90 seconds;

[0024] S2, mixing rubber material: adding precipitated silica, filler, polyisobutylene, zinc stearate, poly 3-hydroxyalkanoate, bio-based furan polyester, and processing aid into an internal mixer in sequence, mixing and kneading for 11 minutes, and discharging to obtain a mixed rubber material;

[0025] S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 82°C for 6 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber;

[0026] S4. Secondary plasticizing: set the roller temperature of the internal mixer to 101°C and the roller speed of the internal mixer to 25rpm, add TAIC crosslinking agent and dipentadienyl vulcanizing agent in sequence, first cool the primary rubber for 48h and then put it into the internal mixer for kneading for 4min, then put it into an open mixer for refining at 82°C for 6min, then filter, and finally put it into a tablet press for calendering to obtain EPDM mixed rubber.

[0027] Example 3: The present invention provides a wearable EPDM compound based on bio-based EPDM, the EPDM compound comprising the following components in parts by weight: 100 parts of bio-based EPDM, 25 parts of precipitated silica, 25 parts of filler, 12 parts of polyisobutylene, 8 parts of zinc stearate, 12 parts of poly 3-hydroxyalkanoate, 12 parts of bio-based furan polyester, 2 parts of processing aid, 2 parts of TAIC cross-linking agent, and 2 parts of dipentadienyl vulcanizer.

[0028] The preparation method of EPDM rubber compound comprises the following steps:

[0029] S1. Raw rubber plasticizing: set the roller temperature of the internal mixer to 144°C and the roller speed of the internal mixer to 28 rpm, and put the bio-based EPDM into the internal mixer for rubber breaking and kneading for 90 seconds;

[0030] S2, mixing rubber material: adding precipitated silica, filler, polyisobutylene, zinc stearate, poly 3-hydroxyalkanoate, bio-based furan polyester, and processing aid into an internal mixer in sequence, mixing and kneading for 14 minutes, and discharging to obtain a mixed rubber material;

[0031] S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 88°C for 7 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber;

[0032] S4. Secondary plasticizing: set the roller temperature of the internal mixer to 104°C and the roller speed of the internal mixer to 28 rpm, add TAIC crosslinking agent and dipentadienyl vulcanizing agent in sequence, first cool the primary rubber for 48 hours and then put it into the internal mixer for kneading for 4 minutes, then put it into an open mixer for refining at 88°C for 7 minutes, then filter, and finally put it into a tablet press for calendering to obtain EPDM mixed rubber.

[0033] Example 4: The present invention provides a wearable EPDM compound based on bio-based EPDM, the EPDM compound comprising the following components in parts by weight: 100 parts of bio-based EPDM, 30 parts of precipitated silica, 30 parts of filler, 15 parts of polyisobutylene, 10 parts of zinc stearate, 15 parts of poly 3-hydroxyalkanoate, 15 parts of bio-based furan polyester, 3 parts of processing aid, 3 parts of TAIC cross-linking agent, and 3 parts of dipentadienyl vulcanizer.

[0034] The preparation method of EPDM rubber compound comprises the following steps:

[0035] S1. Raw rubber plasticizing: set the roller temperature of the internal mixer to 145°C and the roller speed of the internal mixer to 30 rpm, and put the bio-based EPDM into the internal mixer for rubber breaking and kneading for 100 seconds;

[0036] S2, mixing rubber material: adding precipitated silica, filler, polyisobutylene, zinc stearate, poly 3-hydroxyalkanoate, bio-based furan polyester, and processing aid into an internal mixer in sequence, mixing and kneading for 15 minutes, and discharging to obtain a mixed rubber material;

[0037] S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 90°C for 8 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber;

[0038] S4. Secondary plasticizing: set the roller temperature of the internal mixer to 105°C and the roller speed of the internal mixer to 30rpm, add TAIC crosslinking agent and dipentadienyl vulcanizing agent in sequence, first cool the primary rubber for 48h and then put it into the internal mixer for kneading for 5min, then put it into an open mixer for refining at 90°C for 8min, then filter it, and finally put it into a tablet press for calendering to obtain EPDM mixed rubber.

[0039] In Examples 1 to 4, the fillers are highly dispersed precipitated silica and chloride titanium dioxide, and the mass ratio of highly dispersed precipitated silica to chloride titanium dioxide is 1:1. In Example 1, the bio-based EPDM is Alanxinke's bio-based EPDM5470, the poly 3-hydroxyalkanoate is a short-chain PHA, and the processing aid is Disperagtor FL; in Example 2, the bio-based EPDM is Alanxinke's bio-based EPDM6570, the poly 3-hydroxyalkanoate is a short-chain PHA, and the processing aid is Mediaplast40; in Example 3, the bio-based EPDM is Alanxinke's bio-based EPDM6950, the poly 3-hydroxyalkanoate is a medium- and long-chain PHA, and the processing aid is Disperagtor FL; In Example 4, the bio-based EPDM is a combination of Alanxinco bio-based EPDM5470, Alanxinco bio-based EPDM6570, and Alanxinco bio-based EPDM6950, the mass ratio of Alanxinco bio-based EPDM5470, Alanxinco bio-based EPDM6570, and Alanxinco bio-based EPDM6950 is 1:1:1, the poly 3-hydroxyalkanoate is a medium-chain PHA, and the processing aid is Mediaplast 40.

[0040] Test example

[0041] Test name: Saturated oil absorption test

[0042] Test content: The EPDM rubber mixture prepared in Examples 1 to 4 was cut into a size of 5cm×5cm×2cm as the experimental group, and the EPDM rubber of model DF940 produced by Dow Company of the United States was cut into a size of 5cm×5cm×2cm as the control group. The experimental group and the control group were respectively immersed in the oil to be tested at 40°C for 24 hours, and then the experimental group and the control group were taken out, and the adsorbent on their surface was washed with acetate, and then the experimental group and the control group were placed in an oven for drying, and finally the mass change was measured, and the results were recorded in Table 1. The oil to be tested is a mixture of ethanol and olive oil, wherein the volume fraction ratio of ethanol to olive oil is 1:1.

[0043] Table 1 Saturated oil absorption test results

[0044] Mass before test / mg Weight after test / g Quality change percentage / % Control group 43425.2 43266.44 0.3656 Example 1 67586.3 67445.22 0.2087 Example 2 69148.5 69024.78 0.1789 Example 3 71738.1 71637.67 0.1400 Example 4 73852.4 73763.50 0.1204

[0045] According to the data in Table 1, the mass change percentages of the EPDM rubber compounds prepared in Examples 1 to 4 are all smaller than that of the control group, and the EPDM rubber compounds prepared in Examples 1 to 4 have good oil resistance.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wearable EPDM compound based on bio-based EPDM, characterized in that: The EPDM rubber compound comprises the following components in parts by weight: 100 parts of bio-based EPDM, 15-30 parts of precipitated silica, 15-30 parts of filler, 5-15 parts of polyisobutylene, 2-10 parts of zinc stearate, 5-15 parts of poly 3-hydroxyalkanoate, 5-15 parts of bio-based furan polyester, 0.5-3 parts of processing aid, 0.5-3 parts of TAIC cross-linking agent, and 0.5-3 parts of dipentadienyl vulcanizer; the poly 3-hydroxyalkanoate is a short-chain PHA or a medium-long chain PHA; the preparation method of the EPDM rubber compound comprises the following steps: S1. Raw rubber plasticizing: set the roller temperature of the internal mixer to 140-145°C, the roller speed of the internal mixer to 20-30 rpm, and put the bio-based EPDM into the internal mixer for breaking and kneading for 80-100 seconds; S2, mixing rubber material: adding precipitated silica, filler, polyisobutylene, zinc stearate, poly 3-hydroxyalkanoate, bio-based furan polyester, and processing aid into an internal mixer in sequence, mixing and kneading for 10 to 15 minutes, and discharging to obtain a mixed rubber material; S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 80-90°C for 5-8 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber; S4, secondary plasticizing: set the roller temperature of the internal mixer to 100-105°C, the roller speed of the internal mixer to 20-30rpm, add TAIC crosslinking agent and dipentadienyl vulcanizing agent in sequence, first cool the primary rubber for 48h and then put it into the internal mixer for kneading for 3-5min, then put it into an open mixer for refining at 80-90°C for 5-8min, then filter, and finally put it into a tablet press for calendering to obtain the EPDM rubber mixture.

2. A wearable EPDM rubber compound based on bio-based EPDM according to claim 1, characterized in that: The bio-based EPDM is one of Alanxinco bio-based EPDM5470, Alanxinco bio-based EPDM6570, Alanxinco bio-based EPDM6950, or a combination of more than one of them.

3. A wearable EPDM rubber compound based on bio-based EPDM according to claim 1, characterized in that: The fillers are highly dispersed precipitated silica and chloride-process titanium dioxide, and the mass ratio of the highly dispersed precipitated silica to the chloride-process titanium dioxide is 1:

1.

4. The wearable EPDM compound based on bio-based EPDM according to claim 1, characterized in that: The processing aid is Disperagtor FL or Mediaplast 40.