Refrigerant-resistant R290 rubber material as well as preparation method and application thereof

Abstract

The invention provides a refrigerant-resistant R290 rubber material as well as a preparation method and application thereof, and relates to the technical field of rubber materials. The refrigerant-resistant R290 rubber material is prepared from the following raw materials in parts by mass: 100 parts of raw rubber, 30 to 70 parts of inorganic filler, 0 to 70 parts of carbon black, 30 to 60 parts of white carbon black, 10 to 40 parts of plasticizer, 3 to 8 parts of vulcanizing agent, 2 to 5 parts of indirect method zinc oxide and 1 to 3 parts of anti-aging agent. The rubber material provided by the invention has excellent low temperature resistance and permeation resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber materials, and in particular to a refrigerant R290-resistant rubber material and a preparation method and application thereof. Background Art

[0002] The current booming development of new energy vehicles, the demand for low-temperature heating in new energy vehicles, and the implementation of carbon emission policies have led to the development of low-temperature heat pump technology for new energy vehicles, and new refrigerants R744 and R290 have also emerged. Due to the superiority of R290 (refrigeration-grade propane) in production costs, it has been adopted by many new energy vehicle companies at home and abroad. However, R290 is a small molecular weight gaseous alkane with a boiling point much lower than traditional refrigerants. In addition to good compatibility with it, the rubber material formula also needs to have good low-temperature properties and permeability resistance. Therefore, there is an urgent need to develop a rubber material that meets the sealing requirements of electric vehicle heat pumps using R290. Summary of the Invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a rubber material resistant to refrigerant R290 and a preparation method and application thereof.

[0004] The present invention provides a refrigerant R290 resistant rubber material comprising the following raw materials in parts by mass: 100 parts of raw rubber, 30-70 parts of inorganic filler, 0-70 parts of carbon black, 30-60 parts of white carbon black, 10-40 parts of plasticizer, 3-8 parts of vulcanizing agent, 2-5 parts of indirect zinc oxide, and 1-3 parts of antioxidant.

[0005] Preferably, the raw rubber is hydrogenated nitrile rubber.

[0006] The purpose of selecting hydrogenated nitrile rubber as the raw rubber in the present invention is to use it as the main rubber material and vulcanize it at high temperature.

[0007] Preferably, the inorganic filler is selected from one or more of calcium silicate, magnesium silicate and sodium silicate.

[0008] Preferably, the density of the inorganic filler is 1.9-2.3 g / cm 3 ; pH value is 7.5-8.5; SiO2 content is 88%, water soluble matter is 0.1%, hydrochloric acid soluble matter is 0.3%, specific surface area is 40-65m 2 / g.

[0009] Preferably, the plasticizer is a fatty dibasic acid ester.

[0010] Preferably, the particle size of the white carbon black is 10-15 μm; the SiO2 content is greater than 98% and the specific surface area is 75-90 m 2 / g.

[0011] Controlling the particle size and specific surface area of silica within a certain range helps to improve the mechanical properties of rubber materials. In addition, it is also beneficial to improve compatibility with raw rubber.

[0012] Preferably, the vulcanizing agent is vulcanizing agent BIPB.

[0013] The function of the vulcanizing agent is to vulcanize the raw rubber.

[0014] Preferably, the antioxidant is antioxidant KY405.

[0015] The function of antioxidants is to resist aging.

[0016] A method for preparing a rubber material resistant to refrigerant R290 comprises the following steps:

[0017] S1. Put the raw rubber into an internal mixer and mix it evenly, then add carbon black and white carbon black and mix them evenly to obtain a mixture A;

[0018] S2. Add inorganic filler, plasticizer, antioxidant, and indirect zinc oxide to mixture A, and mix thoroughly until the mixture is cohesive to obtain mixture B.

[0019] S3, adding a vulcanizing agent to the mixture B and mixing evenly to obtain a mixture C;

[0020] S4, pre-forming the mixture C by milling, and then adding it into a mold for vulcanization molding to obtain.

[0021] In the above-mentioned S1, the banburying temperature is 80-100° C., the banburying time is 3-4 min, and the banburying speed is 25-35 rpm.

[0022] In the above-mentioned S2, the mixing temperature is 80-100° C., the mixing time is 6-8 min, and the mixing speed is 35-55 rpm.

[0023] In the above-mentioned S3, the mixing temperature is 110-120° C., the mixing time is 2 min, and the mixing speed is 45-55 rpm.

[0024] In the above-mentioned S4, the refining temperature is 40-55°C.

[0025] In the above-mentioned S4, the temperature during the vulcanization molding process is 180° C. and the pressure is 10-15 MPa.

[0026] The present invention also proposes an application of the rubber material in a low-temperature heat pump.

[0027] More preferably, the rubber material is used in the seal of a low-temperature heat pump of an electric vehicle using R290.

[0028] The beneficial effects of the present invention are:

[0029] The inorganic filler of the present invention is used to improve the gas permeation resistance, the plasticizer is used to improve the processability and low temperature performance, and the indirect zinc oxide is used to increase the reaction activity.

[0030] The present invention selects fillers and plasticizers with different specific surface areas for compounding. The inorganic filler selected in the present invention has a lamellar structure, and its lamellar structure and chemical inertness are used to improve the permeability resistance of the material; the plasticizer is compounded into the rubber material to mainly improve the low-temperature resistance to match the application scenario of the low-temperature heat pump. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is described in detail through specific embodiments.

[0032] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0033] Example 1

[0034] A rubber material resistant to refrigerant R290 comprises the following raw materials in parts by mass: 100 parts of hydrogenated nitrile rubber, 70 parts of carbon black, 10 parts of plasticizer dioctyl sebacate, 7 parts of vulcanizing agent BIPB, 5 parts of indirect zinc oxide, and 2 parts of antioxidant KY405.

[0035] A method for preparing a rubber material resistant to refrigerant R290 comprises the following steps:

[0036] S1. Put the raw rubber into an internal mixer and mix it evenly, then add carbon black and mix evenly to obtain a mixture A;

[0037] S2. Add a plasticizer, an antioxidant, and indirect zinc oxide to mixture A, and mix thoroughly until the mixture is cohesive to obtain mixture B;

[0038] S3, adding a vulcanizing agent to the mixture B, and mixing the mixture to 120°C for debinding to obtain a mixture C;

[0039] S4, pre-forming the mixture C by milling, and then adding it into a mold for vulcanization molding to obtain.

[0040] Example 2

[0041] A rubber material resistant to refrigerant R290 comprises the following raw materials in parts by mass: 100 parts of hydrogenated nitrile rubber, 30 parts of inorganic filler calcium silicate, 60 parts of white carbon black, 20 parts of plasticizer dioctyl sebacate, 7 parts of vulcanizing agent BIPB, 5 parts of indirect zinc oxide, and 2 parts of antioxidant KY405.

[0042] The density of calcium silicate is 2.1g / cm 3; pH value is 8; SiO2 content is 88%, water soluble matter is 0.1%, hydrochloric acid soluble matter is 0.3%, specific surface area is 55m 2 / g; the particle size of white carbon black is 12μm; the SiO2 content is greater than 98%, and the specific surface area is 82m 2 / g.

[0043] A method for preparing a rubber material resistant to refrigerant R290 comprises the following steps:

[0044] S1. Put the raw rubber into an internal mixer and mix it evenly, then add white carbon black and mix evenly to obtain a mixture A;

[0045] S2. Add inorganic filler, plasticizer, antioxidant, and indirect zinc oxide to mixture A, and mix thoroughly until the mixture is cohesive to obtain mixture B.

[0046] S3, adding a vulcanizing agent to the mixture B, and mixing the mixture to 120°C for debinding to obtain a mixture C;

[0047] S4, pre-forming the mixture C by milling, and then adding it into a mold for vulcanization molding to obtain.

[0048] Example 3

[0049] A rubber material resistant to refrigerant R290 comprises the following raw materials in parts by mass: 100 parts of hydrogenated nitrile rubber, 70 parts of inorganic filler calcium silicate, 30 parts of white carbon black, 15 parts of plasticizer dioctyl sebacate, 7 parts of vulcanizing agent BIPB, 5 parts of indirect zinc oxide, and 2 parts of antioxidant KY405.

[0050] The density of calcium silicate is 2.1g / cm 3 ; pH value is 8; SiO2 content is 88%, water soluble matter is 0.1%, hydrochloric acid soluble matter is 0.3%, specific surface area is 55m 2 / g; the particle size of white carbon black is 12μm; the SiO2 content is greater than 98%, and the specific surface area is 82m 2 / g.

[0051] The preparation method of the rubber material is the same as that of Example 2.

[0052] Table 1

[0053] Material Name Example 1 Example 2 Example 3 Raw rubber HNBR 100 100 100 carbon black 70 / / Inorganic fillers / 30 70 Silica / 60 30 plasticizers 10 20 15 Curing agent BIPB 7 7 7 Indirect zinc oxide 5 5 5 Antiaging agent KY405 2 2 2

[0054] The rubber materials were tested for hardness, tensile strength, and elongation at break according to GB / T 531 and GB / T 528 standards. Compression set was tested at 150°C for 72 hours according to GB / T 7759. The hardness, tensile strength, elongation at break, and volume change were measured according to GB / T 1690 after exposure to a mixture of refrigerant R290 and refrigeration oil (mass ratio 8:2) at 150°C for 336 hours. The specimen surface was then observed. The glass transition temperature of the rubber materials was also tested according to ISO 11357-2. The test results are shown in Table 2.

[0055] Table 2

[0056]

[0057]

[0058] It can be seen from the data in Table 2 that the rubber material prepared by the present invention has high hardness, small compression permanent deformation, good low-temperature effect, and very ideal resistance to R290 penetration.

[0059] In summary, the rubber material provided by the present invention has excellent low-temperature resistance and permeation resistance.

[0060] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A rubber material resistant to refrigerant R290, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of raw rubber, 30-70 parts of inorganic filler, 0-70 parts of carbon black, 30-60 parts of white carbon black, 10-40 parts of plasticizer, 3-8 parts of vulcanizing agent, 2-5 parts of indirect zinc oxide and 1-3 parts of antioxidant.

2. The rubber material according to claim 1, characterized in that The inorganic filler is selected from one or more of calcium silicate, magnesium silicate and sodium silicate.

3. The rubber material according to any one of claims 1 or 2, characterized in that: The density of the inorganic filler is 1.9-2.3g / cm 3 ; pH value is 7.5-8.5; SiO2 content is 88%, water soluble matter is 0.1%, hydrochloric acid soluble matter is 0.3%, specific surface area is 40-65m 2 / g.

4. The rubber material according to claim 1, characterized in that The raw rubber is hydrogenated nitrile rubber; the vulcanizing agent is vulcanizing agent BIPB; and the antioxidant is antioxidant KY405.

5. A method for preparing the rubber material according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Put the raw rubber into an internal mixer and mix it evenly, then add carbon black and white carbon black and mix them evenly to obtain a mixture A; S2. Add inorganic filler, plasticizer, antioxidant, and indirect zinc oxide to mixture A, and mix thoroughly until the mixture is cohesive to obtain mixture B. S3, adding a vulcanizing agent to the mixture B and mixing evenly to obtain a mixture C; S4, pre-forming the mixture C by milling, and then adding it into a mold for vulcanization molding to obtain.

6. The preparation method according to claim 5, characterized in that In the above-mentioned S3, the mixing temperature is 120°C.

7. The preparation method according to claim 5, characterized in that In the above-mentioned S4, the refining temperature is 40-55° C.; the temperature during the vulcanization molding process is 180° C. and the pressure is 10-15 MPa.

8. Use of the rubber material according to any one of claims 1 to 4 or the rubber material prepared by the preparation method according to any one of claims 5 to 7 in a low-temperature heat pump.

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