Acrylic rubber composition and acrylic rubber crosslinked product
A rubber composition, acrylic technology, applied in the field of acrylic rubber composition to achieve the effect of maintaining tensile strength and tensile stress
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[0079] Hereinafter, the present invention will be described more specifically using examples and comparative examples. Hereinafter, "parts" and "%" are based on weight unless otherwise specified. In addition, the test and evaluation of each characteristic are as follows.
[0080] (1) Mooney viscosity
[0081] Mooney viscosity (ML 1+4 , 100°C) measured in accordance with JIS K6300.
[0082] (2) Normal physical properties and thermal aging physical properties (tensile strength, elongation, 100% tensile stress and hardness)
[0083] At a temperature of 170°C, the acrylic rubber composition was shaped and cross-linked by pressing for 20 minutes to obtain a sheet with a length of 15cm, a width of 15cm, and a thickness of 2mm, and then placed in an oven at a temperature of 170°C for 4 hours for the second time For cross-linking, the secondary cross-linked sheet was punched out with a No. 3 dumbbell cutter to make a test piece, and the following measurement was performed with the...
manufacture example 1
[0089] Add 200 parts of water, 3 parts of sodium lauryl sulfate, 49 parts of ethyl acrylate, 49 parts of mono-n-butyl acrylate and 2 parts of mono-n-butyl fumarate into a polymerization reactor equipped with a thermometer and a stirring device. Gas and nitrogen replacement were carried out twice to fully remove oxygen, and then 0.005 parts of cumene hydroperoxide and 0.002 parts of sodium formaldehyde sulfoxylate were added, and emulsion polymerization was started at normal pressure and a temperature of 30°C until the polymerization conversion rate reached 95. %. The obtained emulsion polymerization solution was coagulated in an aqueous calcium chloride solution, washed with water, and dried to obtain acrylic rubber a. The composition of acrylic rubber a is: 49% of ethyl acrylate monomer unit, 49% of n-butyl acrylate monomer unit, 2% of mono-n-butyl fumarate monomer unit (carboxyl content is 1.25×10 -2 ephr), Mooney viscosity (ML 1+4 , 100°C) is 35.
Embodiment 1
[0091] 100 parts of acrylic rubber a, 60 parts of reinforcing agent carbon black (FEF Carbon, manufactured by Tokai Carbon Corporation), 2 parts of processing aid stearic acid, and antioxidant styrenated diphenylamine [Steara- LAS, produced by Seiko Chemical Co., a mixture of compounds of the above formula (1) and formula (2)] 0.5 parts were put into a Banbury mixer, kneaded at 50° C., and then transferred to an open roll mill, Add 1 part of crosslinking agent 2,2'-bis[4-(4-aminophenoxy)phenyl]propane and 2 parts of crosslinking accelerator 1,3-di-o-tolylguanidine, mix at 40°C kneading to prepare an acrylic rubber composition.
[0092] The obtained acrylic rubber compositions were subjected to normal-state physical properties and thermal aging physical properties (tensile strength, elongation, 100% tensile stress, and hardness) and compression set tests. The results are shown in Table 1.
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