Wear-resistant sealing gasket and preparation method thereof

[0032] The present invention also includes the preparation method of the above-mentioned wear-resistant gasket, comprising the steps of:

[0033] S1 Put vinyl polydimethylsiloxane, nano silicon dioxide, mercaptan-modified neoprene rubber, acrylonitrile butadiene rubber, and hexamethyldisiloxane into the defoaming mixer in turn, and stir for 5- 20 minutes;

[0034] S2 Pour the stirred raw materials into the mold of the vulcanizer, heat and press to obtain a semi-finished product;

[0035] S3 processes semi-finished products into wear-resistant gaskets.

[0036] The temperature of heating and pressing in the step S2 is 160-180 degrees, and the pressing is 0.5-0.8Mpa.

[0037] The duration of step S2 is 10-30 minutes.

[0038] Step S1 puts the raw materials into the defoaming mixer in multiple batches.

[0040] A wear-resistant sealing gasket, comprising in parts by mass: 100 parts of vinyl polydimethylsiloxane, 12 parts of nano-silica, 40 parts of mercaptan-modified neoprene rubber, and 6 parts of acrylonitrile butadiene rubber , 56 parts of hexamethyldisiloxane; the nano-silica selects the nano-silica whose specific surface area is 460m2 / g. Mercaptan-modified chloroprene rubber is obtained by polymerization of chloroprene in an octyl mercaptan environment.

[0041] The content of acrylonitrile in the acrylonitrile butadiene rubber is 36%.

[0042] A preparation method for a wear-resistant sealing gasket, comprising the steps of:

[0043] S1 Put vinyl polydimethylsiloxane, nano-silica, mercaptan-modified neoprene rubber, acrylonitrile butadiene rubber, and hexamethyldisiloxane into a defoaming mixer in turn, and stir for 5 minutes ;

[0044] S2 Pour the stirred raw materials into the mold of the vulcanizer, heat and press to obtain a semi-finished product;

[0045] S3 proc

[0049] A wear-resistant sealing pad, comprising in parts by mass: 120 parts of vinyl polydimethylsiloxane, 10 parts of nano silicon dioxide, 40 parts of mercaptan-modified neoprene rubber, and 10 parts of acrylonitrile butadiene rubber , 60 parts of hexamethyldisiloxane;

[0050] The content of acrylonitrile in the acrylonitrile butadiene rubber is 40%.

[0051] The preparation method of above-mentioned wear-resisting gasket, comprises the steps:

[0052] S1 Put vinyl polydimethylsiloxane, nano silicon dioxide, mercaptan-modified chloroprene rubber, acrylonitrile butadiene rubber, and hexamethyldisiloxane into the defoaming mixer three times, and stir for 15 minute;

[0053] S2 Pour the stirred raw materials into the mold of the vulcanizer, heat and press to obtain a semi-finished product;

[0054] S3 processes semi-finished products into wear-resistant gaskets.

[0055] The temperature of heating and pressing in the step S2 is 180 degrees, and the pressing is 0.7Mpa. The du