Preparation method of a wide temperature range high damping rubber-plastic blended foam material
A technology of foaming materials and high damping, which is applied in the field of preparation of rubber-plastic blended foaming materials with wide temperature range and high damping, can solve the problems of not combining its own viscoelasticity with porous structure, so as to broaden the damping temperature range and improve Damping factor, effect of cell uniformity
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[0029] Aiming at the problems of low effective damping temperature range and poor sound insulation effect of high-damping rubber-plastic blended foam materials in the prior art, the present invention provides a method for preparing a wide-temperature range high-damping rubber-plastic blended foam material, which includes The following steps:
[0030] (1) The first stage mixing adopts an internal mixer, the initial temperature is set at 150-180℃, the rotor speed is 40-60r / min, polylactic acid is added first, and then ethylene-vinyl acetate rubber and silica are mixed. Refining, the mass fraction ratio is 10-40 parts of polylactic acid: 60-90 parts of ethylene-vinyl acetate: 20-80 parts of white carbon black. The rubber is discharged after timing and mixing for 10-20 minutes from the start of the addition of the ethylene-vinyl acetate. The vinyl acetate content of vinyl acetate rubber is 70%; the second-stage mixing adopts a double-roll mill, and at room temperature, 1-4 parts by m...
Embodiment 1
[0047] Adopt HAAKE torque rheometer mixing chamber, initial temperature is set to 160℃, rotor speed is 50r / min, put 20 grams of PLA into the mixing chamber first, mix for 1 minute, add 80 grams of EVM700, mix For 1 minute, add 30 grams of white carbon black in two parts, then mix for 10 minutes and then discharge the rubber; then use a two-roll mill to add 2 grams of zinc oxide and 1 gram of stearin to one stage of the mixed rubber at room temperature. Acid, 4 grams of AC foaming agent, 6 grams of vulcanizing agent BIPB, thin pass 5 times to lower the sheet to prepare rubber compound a. After mixing rubber a is allowed to stand for 16 hours, use a plate vulcanizer to mold the vulcanization and foam, the mold pressure is 10MPa, the vulcanization and foaming temperature is 170℃, and the vulcanization and foaming time is 2 minutes. The effective damping temperature with uniform cells can be obtained. The range is 103℃ wide temperature range high damping blend material.
Embodiment 2
[0049] Adopt HAAKE torque rheometer mixing chamber, initial temperature is set to 160℃, rotor speed is 50r / min, put 30 grams of PLA into the mixing chamber first, mix for 1 minute, add 70 grams of EVM700, mix For 1 minute, add 40 grams of white carbon black in two times, then mix for 10 minutes, and then discharge the rubber; then use a two-roll mill, add 1 gram of zinc oxide and 0.5 gram of stearin to one stage of the mixed rubber at room temperature. Acid, 2 grams of AC foaming agent, 9 grams of BIPB vulcanizing agent, thin pass 8 times to produce the rubber compound a. After the rubber mixture a is allowed to stand for 8 hours, use a plate vulcanizer to mold the vulcanization and foam, the mold pressure is 10MPa, the vulcanization and foaming temperature is 170℃, and the vulcanization and foaming time is 3 minutes to obtain an effective damping temperature with uniform cells. The domain is 87℃ wide temperature range high damping blend material.
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