Nitrile rubber product without corrosion to contact of plastic parts and preparation method of nitrile rubber product

Abstract

The invention discloses a nitrile rubber product without corrosion to plastic part contact and a preparation method of the nitrile rubber product. The nitrile rubber product without corrosion to plastic part contact comprises the following raw materials in parts by weight: 100 parts of nitrile rubber; 20 to 40 parts of carbon black; 5-20 parts of white carbon black; 20 to 50 parts of calcium carbonate; 5-40 parts of a plasticizer; 5 parts of zinc oxide; 1 part of stearic acid; 1-2 parts of an anti-aging agent; 0.5 to 2 parts of polyethylene glycol; 1-2 parts of sulfur; 2-4 parts of an accelerant; wherein the plasticizer is DOA (dioctyl adipate) or TOTM (total organic trimer) The nitrile rubber product without corrosion to plastic part contact solves the problem of contact corrosion to plastic parts caused by migration of a plasticizer in the nitrile rubber product after the nitrile rubber product is in contact with the plastic parts such as ABS (acrylonitrile butadiene styrene), HIPS (high impact polystyrene) and the like.

Description

Technical Field

[0001] This application relates to a composition of polymer compounds, and specifically to a nitrile rubber product that does not corrode when in contact with plastic parts. Background Art

[0002] For nitrile rubber products, common plasticizers may include phthalates, phosphates, or other types of plasticizers, such as DOP, DBP, etc. Nitrile rubber products are widely used in products such as air conditioners and televisions.

[0003] In the above products, nitrile rubber products will come into contact with plastic parts made of materials such as ABS and HIPS. During the contact process between nitrile rubber products and plastic parts made of materials such as ABS and HIPS, the plasticizers in the nitrile rubber products will migrate to the plastic parts made of materials such as ABS and HIPS, resulting in the softening and yellowing of the plastic parts made of materials such as ABS and HIPS, and even causing changes in the internal structure of the plastic parts and resulting in failures such as cracking and deformation. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a nitrile rubber product that does not corrode when in contact with plastic parts, and the technical solutions adopted include:

[0005] A nitrile rubber product that does not corrode when in contact with plastic parts, and the raw materials by weight include:

[0006]

[0007]

[0008] Among them, the plasticizer is DOA or TOTM.

[0009] One embodiment of the present invention solves the technical problem by adopting the technical solution that the nitrile rubber used is nitrile rubber with medium acrylonitrile content or low acrylonitrile content.

[0010] One embodiment of the present invention solves the technical problem by adopting the technical solution that the acrylonitrile content in the nitrile rubber is less than 33%.

[0011] This application also provides a preparation method of a nitrile rubber product that does not corrode when in contact with plastic parts, which is characterized by including:

[0012] Put the nitrile rubber into a mixer, mix it until the temperature reaches 125 - 135 °C and then discharge the material, and let it stand at room temperature for 24 - 48 h;

[0013] Then, the masterbatch, zinc oxide, stearic acid, anti-aging agent, and polyethylene glycol are put into a Banbury mixer for the first mixing. The mixing temperature is 120°C and the mixing time is 5 minutes.

[0014] The carbon black, silica, and plasticizer are put into the Banbury mixer for the second mixing. The mixing temperature is 120°C and the mixing time is 5 minutes to obtain the mixed rubber.

[0015] Sulfur and accelerator are added to the mixed rubber, and then thin-sheeting is carried out 6 - 8 times. After sheeting, the NBR compound is obtained. The NBR compound is vulcanized. The vulcanization process is at 158 - 162°C and the vulcanization time is 5 - 8 minutes to obtain the NBR product that has no corrosion on contact with plastic parts.

[0016] The beneficial effects of the present invention: solve the problem that after the NBR product contacts (ABS, HIPS, etc.) plastic parts, the plasticizer migration in the NBR product causes contact corrosion of the plastic parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0018] Figure 1 is a schematic diagram after the corrosion test of the ABS plastic part in the embodiment of the present application;

[0019] Figure 2 is a schematic diagram after the corrosion test of the ABS plastic part in the comparative example of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The terms used in the present invention generally have the meanings commonly understood by those of ordinary skill in the art unless otherwise specified.

[0021] The present invention will be further described in detail below with reference to specific embodiments and data. It should be understood that this embodiment is only for illustrating the present invention and does not limit the scope of the present invention in any way.

[0022] In the following embodiments, the various processes and methods not described in detail are conventional methods well known in the art. The materials, reagents, devices, instruments, equipment, etc. used in the following examples can be obtained from commercial sources unless otherwise specified.

[0023] The present invention discloses an NBR product, which solves the problem that after the NBR product contacts (ABS, HIPS, etc.) plastic parts, the plasticizer migration in the NBR product causes contact corrosion of the plastic parts. The raw materials of the NBR product include, by weight:

[0024]

[0025] Among them, the plasticizer is DOA or TOTM.

[0026] For the above-mentioned nitrile rubber products, embodiments and comparative examples of the present application are proposed. The embodiments are the raw material compositions and contents of the nitrile rubber products in the present application, and the comparative examples are the raw material compositions and contents of the nitrile rubber products with common formulations in the prior art. The raw materials of the nitrile rubber products in the embodiments and comparative examples are shown in Table 1.

[0027] Table 1

[0028]

[0029] According to the raw materials of the nitrile rubber products provided in Table 1, the raw materials provided in the embodiments and comparative examples are prepared into nitrile rubber products by the following method:

[0030] Put the nitrile rubber into a mixer, knead it until the temperature reaches 125 - 135 °C, then discharge the material, and let it stand at room temperature for 24 - 48 h;

[0031] Then put the masterbatch, zinc oxide, stearic acid, antioxidant, and polyethylene glycol into the mixer for the first mixing. The mixing temperature is 120 °C and the mixing time is 5 min;

[0032] Put carbon black, silica, and plasticizer into the mixer for the second mixing. The mixing temperature is 120 °C and the mixing time is 5 min to obtain a mixed rubber;

[0033] Add sulfur and accelerator to the mixed rubber, then perform thin pass for 6 - 8 times, take out the sheet to obtain a nitrile rubber compound, and perform vulcanization treatment on the nitrile rubber compound. The vulcanization process is 158 - 162 °C and the vulcanization time is 6 min to obtain a nitrile rubber product that does not corrode the plastic part upon contact.

[0034] Perform performance tests on the nitrile rubber products that do not corrode the plastic part obtained in the embodiments and comparative examples. The test items include the hardness, tensile strength, and elongation at break of the nitrile rubber products at room temperature, as well as the hardness, tensile strength, and elongation at break of the nitrile rubber products after hot air aging. The test results are shown in Table 2.

[0035] Conduct a corrosion test on the contact between the nitrile rubber products obtained in the embodiments and comparative examples and ABS plastic parts. The test method is as follows: Stack the nitrile rubber products on the upper surface of the ABS plastic parts, place a 1 kg weight on the surface of the nitrile rubber products, then place them at 80 °C for 48 h and take them out. After removing the weight and the nitrile rubber products, observe whether the surface of the plastic parts turns yellow. The results are shown in Table 2, Figure 1 and Figure 2 as shown.

[0036] Table 2

[0037]

[0038] As can be seen from the content of Table 2, the performance of the nitrile rubber products in this application is similar to that of the nitrile rubber products in the prior art;

[0039] According to Figure 1 the content shown, after the nitrile rubber products prepared in the examples are in contact with the ABS plastic parts, the surface is smooth and without color change, and there is no yellowing, corrosion or adhesion.

[0040] According to Figure 2 the content shown, after the nitrile rubber products prepared in the comparative examples are in contact with the ABS plastic parts, the ABS plastic parts turn yellow, and the nitrile rubber products and the ABS plastic parts melt together.

[0041] Of course, the present invention is not limited to the above embodiments. Those skilled in the art can also make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations and substitutions are all included within the scope defined by the claims of this application.

Claims

1. A nitrile rubber product that is non-corrosive to plastic parts, characterized in that: The raw materials include by weight: Wherein, the plasticizer is DOA or TOTM.

2. The nitrile rubber product having no contact corrosion to plastic parts according to claim 1, characterized in that: The nitrile rubber is a nitrile rubber with medium or low acrylonitrile content.

3. The nitrile rubber product having no corrosion to plastic parts according to claim 2, characterized in that: The acrylonitrile content in the nitrile rubber is less than 33%.

4. A method for preparing a nitrile rubber product that is non-corrosive to plastic parts as claimed in any one of claims 1 to 3, characterized in that: include: Put the nitrile rubber into the internal mixer, mix it to 125-135℃, then discharge it and leave it at room temperature for 24-48h; Then, the masterbatch, zinc oxide, stearic acid, antioxidant and polyethylene glycol were put into the internal mixer for the first mixing at a mixing temperature of 120°C and a mixing time of 5 minutes. Put carbon black, white carbon black and plasticizer into an internal mixer for a second mixing at a mixing temperature of 120°C for 5 minutes to obtain a mixed rubber; After adding sulfur and accelerator to the rubber mix, thin-pass the mixture for 6 to 8 times to obtain a sheet of nitrile rubber compound, which is vulcanized at a temperature of 158 to 162° C. for 5 to 8 minutes to obtain a nitrile rubber product that is non-corrosive to plastic parts.

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