Sponge rubber composition and preparation method thereof
A composition and technology of EPDM, applied in the field of sponge rubber composition and preparation thereof, can solve the problems of large amount of accelerator, low production efficiency, slow vulcanization speed of sponge rubber, etc. The effect of improving extrusion production efficiency and reducing dosage
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preparation example Construction
[0041] Among the present invention, the preparation method of described composition comprises: EPDM rubber, polyether polyol of the present invention and various additives are added to 75 liters internal mixers (Sichuan Yaxi Rubber and Plastic Machinery Co., Ltd., model Carry out one section of mixing in XSN-75 / 30B), park after tableting, cooling; Then add vulcanizing agent, accelerator in the gained mixture, again in open mill (Sichuan Yaxi Rubber and Plastic Machinery Co., Ltd., model is XK-550) for two-stage kneading, thin-pass three times for tableting, cooling, and parking. The temperature of the first-stage mixing can be 100-150°C, the time is about 10-20 minutes, and the parking time is 24 hours; the temperature of the second-stage mixing can be 60-70°C, and the mixing time can be 5- 10 minutes; Described internal mixer and open mixer all can be the various internal mixers and open mixer of routine use in this area. The methods of one-stage mixing and two-stage mixing ...
Embodiment 1
[0045] This example is used to prove that the activation ability of organotellurium in rubber composition is stronger than that of traditional zinc oxide.
[0046] The rubber composition is compounded according to the following proportions, mixed and parked to prepare a masterbatch.
[0047] Based on 100 parts by weight of EPDM rubber, the ratio is as follows:
[0048] EPDM4903 (Netherlands DSM) 100 parts by weight
[0049] Carbon black N550 (Shanghai Cabot) 100 parts by weight,
[0050] 60 parts by weight of paraffin oil 2280 (U.S. Sun brand),
[0051] Foaming agent OBSH (Japan Yonghe Chemical) 2.5 parts by weight
[0052] Active agent ZnO (domestic 99.7%) 5 parts by weight
[0053] Stearic acid 1.0 parts by weight
[0054] Polar additive PEG4000 2 parts by weight
[0055] Sulfur 1.2 parts by weight
[0056] Calcium oxide 5.0 parts by weight.
[0057] The above materials were kneaded on the kneader for one stage and one stage for 10 minutes at a temperature of 150° C. t...
Embodiment 2
[0061] The difference from Example 1 is that the organic tellurium is added as n-butyl tellurium to obtain sponge rubber A2.
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