Sprayable low-viscosity rubber damping compounds
AssigneeHenkel AG & Co. KGaA
InventorsRalf Sauer, Peter Born
Life of this patent
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Abstract
Sprayable low-viscosity rubber damping compounds based on liquid rubbers or elastomers and vulcanization agents, which contain small quantities of structure-reinforcing fiber fillers, are notable for the absence of previously usual solid rubbers and have a very low viscosity in the application state. Acoustic compounds of this kind are sprayable with the aid of fully automatic application systems, and are preferably processed at the basic body stage in vehicle construction.
Claims17
A low-viscosity rubber damping composition that is sprayable through a slit nozzle comprising:
- a) 5.0-40.0% polybutadiene having a molecular weight of about 1000 and comprising about 40-50% vinyl, and,
- 2.0-10.0% polybutadiene with active carboxyl groups and having a molecular weight of about 1700;
- b) a vulcanization system selected from the group consisting of
- i) sulfur and one or more organic accelerator(s) and metal oxide(s);
- ii) peroxide vulcanization systems;
- and
- iii) quinones, quinone dioximes, or dinitrosobenzene, optionally in combination with organic accelerators and/or metal oxide(s);
- c) 0.5 to 5 wt% glass fibers having an average fiber length from 50 μm to 500 μm, a diameter of 5-10 microns, and a maximum fiber length of 1000-2000 μm;
- d) optionally, one or more further additives selected from the group consisting of:
- i) thermoplastic polymers in the form of finely comminuted powders;
- ii) fillers;
- iii) lightweight fillers;
- iv) tackifying agents and/or adhesion promoters;
- v) extender oils;
- vi) aging protection agents;
- and
- vii) rheology adjuvants;
- and,
- e) 15-25% graphite,
- the sum of constituents a) through e) adding up to 100 wt%, and wherein said composition does not contain solid rubbers and has a viscosity from 1000 mPa·s to 100,000 mPa·s, measured per DIN 53019 at 20° C.
A low-viscosity rubber damping composition that is sprayable through a slit nozzle comprising:
- 2.49-10.0
- wt %
- zinc oxide
- 4.20-10.0
- wt %
- calcium oxide
- 0.50-2.0
- wt %
- 4-methylphenol reaction product with
- dicyclopentadiene and isobutylene
- 5.0-30.0
- wt %
- calcium carbonate coated with stearate
- 5.0-50.0
- wt %
- precipitated calcium carbonate
- 0.5-10.0
- wt %
- sulfur
- 0.5-25.0
- wt %
- graphite
- 0.50-2.0
- wt %
- carbon black
- 0.60-2.0
- wt %
- zinc dibenzyl dithiocarbamate
- 0.50-4.0
- wt %
- MBTS (2,2′-dibenzothiazyl disulfide)
- 4.00-10.0
- wt %
- hollow glass spheres
- 0.5-10.0
- wt %
- acetyltri-2-ethylhexyl citrate
- 0.5-10.0%
- glass fibers (average fiber length 100-250 μm,
- longest fiber 1000-2000 μm)
- 5.0-40.0%
- polybutadiene having a molecular weight of about
- 1000 and comprising about 40-50% vinyl, and
- 2.0-10.0%
- polybutadiene with active carboxyl groups and having
- a molecular weight of about 1700;
- the sum of all
- constituents adding up to100%.
A sprayable low-viscosity rubber damping composition comprising:
- 2.49 wt %
- zinc oxide
- 4.20 wt %
- calcium oxide
- 0.50 wt %
- 4-methylphenol reaction product with dicyclopentadiene and
- isobutylene
- 12.80 wt %
- calcium carbonate coated with stearate
- 19.21 wt %
- precipitated calcium carbonate
- 4.20 wt %
- sulfur
- 15.00 wt %
- graphite
- 0.50 wt %
- carbon black
- 0.60 wt %
- zinc dibenzyl dithiocarbamate
- 0.50 wt %
- MBTS (2,2′-dibenzothiazyl disulfide)
- 4.00 wt %
- hollow glass spheres
- 4.00 wt %
- acetyltri-2-ethylhexyl citrate
- 4.00 wt %
- glass fibers having an average fiber length of 100-250 μm, and
- a maximum fiber length of 1000-2000 μm
- 22.0 wt %
- polybutadiene having a molecular weight of about 1000 and
- comprising about 40-50% vinyl;
- and,
- 6.0 wt %
- polybutadiene having a molecular weight of about 1700 and
- comprising active carboxyl groups.
A low-viscosity rubber damping composition that is sprayable through a slit nozzle comprising:
- 2.49 wt %
- zinc oxide
- 4.20 wt %
- calcium oxide
- 0.50 wt %
- 4-methylphenol reaction product with dicyclopentadiene and
- isobutylene
- 15.30 wt %
- calcium carbonate coated with stearate
- 15.41 wt %
- precipitated calcium carbonate
- 3.50 wt %
- sulfur
- 17.50 wt %
- graphite
- 0.50 wt %
- carbon black
- 0.60 wt %
- zinc dibenzyl dithiocarbamate
- 0.60 wt %
- MBTS (2,2′-dibenzothiazyl disulfide)
- 4.00 wt %
- hollow glass spheres
- 4.00 wt %
- technical grade white mineral oil
- 4.00 wt %
- glass fibers having an average fiber length of 100-250 μm, and
- a maximum fiber length of 1000-2000 μm
- 22.0 wt %
- polybutadiene having a molecular weight of about 1000 and
- comprising about 40-50% vinyl;
- and,
- 6.0 wt %
- polybutadiene having a molecular weight of about 1700 and
- comprising active carboxyl groups.
Dependencies are inferred from the claim text.