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Preparation method of durable ultrahigh temperature resisting acrylic rubber
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A technology of polyacrylate and acrylate, which is applied in the field of preparation of durable ultra-high temperature-resistant polyacrylate rubber
Inactive Publication Date: 2013-07-10
李梅
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[0004]In the rubber industry, there are generally two ways to increase the upper limit of heat resistance of ACM polymers: 1. Introducing heat-resistant components into the ACM molecular chain, such as in the ACM molecular chain Introduce silicon-containing or fluorine-containing element units, but because the types of silicon-containing or fluorine-containing monomers that can participate in emulsion polymerization are small and the price is high, it is not economical; it can also be improved by blending with silicone rubber and fluorine rubber. However, due to the blending of different types of rubber, complex issues such as vulcanization system selection and two-phase compatibility are involved, so the corresponding product development of this approach is subject to many restrictions
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Embodiment 1
[0019] 100 parts of raw rubber, 40 parts of N330; 20 parts of N550; 10 parts of kaolin; 1.5 parts of stearic acid; 2 parts of antioxidant 445; 1.5 parts of TCY; 3 parts of BZ; 2 parts of microcrystalline wax;
[0020] According to the above formula for rubber product processing, add polyacrylate rubber raw rubber to the rubber mill, add reinforcing filler, inert filler, stearic acid, anti-aging agent, wax and plasticizer mixture in batches, etc. After the rubber is evenly mixed, add the mixture of vulcanizing agent and vulcanization accelerator at the end, make a triangular bag for 4 times, then release the film, and leave it at room temperature for 8 hours. Afterwards, the mixed rubber was vulcanized under certain conditions. The first-stage vulcanization conditions were: vulcanization temperature 180°C, vulcanization pressure 15MPa, and vulcanization time 15 minutes; the second-stage vulcanization conditions were: vulcanization temperature 170°C, vulcanization time 3 hours. ...
Embodiment 2
[0027] In addition to the general advantages of the product in Example 1 above, the rubber product of this example also has good mechanical processing performance, has small volume expansion after long-term immersion in oil, and can still be used normally at -20°C.
[0028] Example 3. 7 parts of methyl acrylate, 70 parts of ethyl acrylate, 20 parts of butyl acrylate, 2 parts of acrylic acid, 2 parts of methacrylic acid, 180 parts of deionized water, 3 parts of sodium lauryl sulfate, 102 parts of OP-10. Use the method of embodiment 1 to make acrylate raw rubber.
[0029]100 parts of raw rubber, 15 parts of N330, 50 parts of N550, 10 parts of graphite powder, 1.5 parts of stearic acid, 2 parts of antioxidant 445, 1.5 parts of DOTG, 1 part of Diak No.1 curing agent, 2 parts of microcrystalline wax copies, NB-45 copies. Use the method of embodiment 1 to make rubber product.
Embodiment 3
[0030] As automotive oil seals and transformer oil seals, the material in this embodiment can be used for a long time at 180°C.
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Abstract
The invention discloses a preparation method of durable ultra-high temperature-resistant polyacrylate rubber, which relates to the field of rubber chemical synthesis. The present invention uses acrylate monomers, low-temperature monomers, and vulcanization point monomers as comonomers, supplemented with deionized water and emulsifiers, removes the complex initiator system in the chemically induced emulsion polymerization process, and simplifies the process formula; The preparation method of the present invention initiates emulsion polymerization by high-energy radiation at normal temperature, increases the gel content in the raw rubber through pre-micro-crosslinking to increase the average molecular weight of the raw rubber, and finally achieves the purpose of increasing the heat-resistant upper limit of the polyacrylate rubber. The ACM product of the present invention can be used for a long time in a high-temperature oil seal environment of 170°C, and can be used intermittently for a short time at a temperature of 200°C or above, and has good machining performance.
Description
technical field [0001] The invention relates to rubber chemical synthesis, in particular to a preparation method of durable ultra-high temperature-resistant polyacrylate rubber. Background technique [0002] Polyacrylate rubber, referred to as ACM, is a special rubber with excellent oil and heat resistance, and is widely used in automotive oil seals, transformer seals and other fields. The main chain of ACM is a saturated carbon chain, and the side groups are polar ester groups. This molecular structure makes ACM have outstanding heat resistance and resistance to hydrocarbon oil swelling. The basic route of ACM synthesis technology is to adopt batch emulsion polymerization process or semi-continuous emulsion polymerization process. In the patent case whose publication number is CN101445575A (a heat-resistant acrylate rubber), the traditional batch emulsion polymerization process is adopted. This patent adjusts the basic formula of ACM emulsion and selects the appropriate r...
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