Stripping composition for a mold for making a composite material part, and method of preparing
AssigneeAirbus Helicopters
InventorsPatrick Boschet, Emmanuel Piel
Life of this patent
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Abstract
A stripping composition, and a method of making the stripping composition. The stripping composition including 100 parts by weight of a base ingredient consisting in epoxy polydimethylsiloxane, 0.5 to 10 parts by weight of a polymerization agent for polymerizing the base ingredient and constituted by a diaryliodonium salt, not more than 30 parts by weight of an anti-adhesion modulator constituted by a silicone polymer; and not more than 40 parts by weight of an anti-stick agent making the composition less tacky prior to polymerization and constituted by at least one vinyl ether compound.
Claims19
A method of making a polymerizable stripping composition for coating a mold, said method comprising combining the following:
- 100 parts by weight of a base ingredient comprising a first epoxy polydimethylsiloxane;
- 0.5 to 10 parts by weight of a polymerization agent comprising a diaryliodonium salt for polymerizing said base ingredient;
- 5 to 10 parts by weight of an anti-adhesion modulator comprising a second epoxy polydimethylsiloxane, different from the first epoxy polydimethylsiloxane, the first and second epoxy polydimethylsiloxanes being from different products and the second epoxy polydimethylsiloxane having a higher viscosity than the first epoxy polydimethylsiloxane;
- and
- an antistick agent comprising 8 to 12 parts by weight of dodecyl monovinyl ether compound and 8 to 12 parts by weight of cyclohexane dimethanol divinyl ether in the stripping composition to form a solvent-free polymerizable liquid stripping composition, said stripping composition being polymerizable by application of heat.
A heat polymerizable stripping composition comprising:
- 100 parts by weight of a base ingredient comprising a first epoxy polydimethylsiloxane;
- 0.5 to 10 parts by weight of a polymerization agent comprising a diaryliodonium salt for polymerizing said base ingredient;
- 5 to 10 parts by weight of an anti-adhesion modulator, said anti-adhesion modulator comprising a second epoxy polydimethylsiloxane the first and second epoxy polydimethylsiloxanes being from different products and the second epoxy polydimethylsiloxane having a higher viscosity than the first epoxy polydimethylsiloxane wherein the first and second epoxy polydimethylsiloxanes together form a bimodal chain length distribution;
- and
- an antistick agent comprising 8 to 12 parts by weight of dodecyl monovinyl ether compound and 8 to 12 parts by weight of cyclohexane dimethanol divinyl ether in the stripping composition.
A stripping composition application system comprising:
- a cloth pre-impregnated with a heat polymerizable liquid and solution-free stripping composition comprising:
- 100 parts by weight of a base ingredient comprising a first epoxy polydimethylsiloxane;
- 0.5 to 10 parts by weight of a polymerization agent comprising a diaryliodonium salt for polymerizing said base ingredient;
- 5 to 10 parts by weight of an anti-adhesion modulator, said anti-adhesion modulator comprising a second epoxy Polydimethylsiloxane;
- and
- an antistick agent comprising 8 to 12 parts by weight of dodecyl monovinyl ether compound and 8 to 12 parts by weight of cyclohexane dimethanol divinyl ether in the stripping composition.
A method of applying a stripping composition to a mold, said method comprising:
- providing a mold having a mold surface;
- providing a heat polymerizable liquid and solvent-free stripping composition comprising:
- 100 parts by weight of a base ingredient comprising a first epoxy polydimethylsiloxane;
- 0.5 to 10 parts by weight of a polymerization agent comprising a diaryliodonium salt for polymerizing said base ingredient;
- 5 to 10 parts by weight of an anti-adhesion modulator, said anti-adhesion modulator comprising a second epoxy Polydimethylsiloxane;
- and
- an antistick agent comprising 8 to 12 parts by weight of dodecyl monovinyl ether compound and 8 to 12 parts by weight of cyclohexane dimethanol divinyl ether in the stripping composition;
- applying the stripping composition to the surface of the mold in a thickness on the order of one micrometer;
- and
- heating the stripping composition to polymerize the stripping composition.
A stripping composition applicator comprising:
- a wipe pre-impregnated with a stripping composition, the stripping composition comprising:
- 100 parts by weight of a base ingredient comprising a first epoxy polydimethylsiloxane;
- 0.5 to 10 parts by weight of a polymerization agent comprising a diaryliodonium salt for polymerizing said base ingredient;
- 5 to 10 parts by weight of an anti-adhesion modulator, said anti-adhesion modulator comprising a second epoxy polydimethylsiloxane;
- and
- an antistick agent comprising 8 to 12 parts by weight of dodecyl monovinyl ether compound and 8 to 12 parts by weight of cyclohexane dimethanol divinyl ether in the stripping composition;
- the polymerizable stripping composition being in a liquid form, solvent-free and curable by heat.
Dependencies are inferred from the claim text.