Fluorosilicone compositions and methods related thereto
A composition is described herein that includes a fluorosilicone, a silicon-based crosslinker, a reinforcement filler, a curing catalyst, a first non-reactive spacer filler, and a second filler comprising one or more silanol groups. Methods of using such a composition are also described.
1. A composition comprising:
a) 100 parts by weight of a fluorosilicone;
b) from about 2 to about 20 parts by weight of a silicon-based crosslinker;
c) from about 0.1 to about 40 parts by weight of a first non-reactive spacer filler;
d) from about 0.1 to about 40 parts by weight of a second filler comprising one or more silanol groups; and
e) from about 0.01 to about 5 parts by weight of a curing catalyst,
wherein a weight ratio of the first non-reactive spacer filler to the second filler comprising one or more silanol groups is from about 1:0.5 to about 1:7.
2. The composition of claim 1 , wherein the composition has a tensile strength of at least 200 psi after being exposed to 600° F. in air for 60 minutes.
3. The composition of claim 1 , wherein the composition has a tensile strength of at least 350 psi after being exposed to 600° F. in air for 30 minutes.
4. The composition of claim 1 , wherein the composition has an elongation of at least 300% after being exposed to 600° F. in air for 30 minutes.
5. The composition of claim 1 , wherein the fluorosilicone comprises a perfluoroalkyl polydiorganopolysiloxane.
6. The composition of claim 1 , wherein the fluorosilicone comprises (3,3,3-trifluoropropyl)organosiloxane units.
7. The composition of claim 1 , wherein the silicon-based crosslinker comprises an alkoxysilicon compound, an acetoxysilicon compound, a ketoximosilicon compound, or a combination thereof.
8. The composition of claim 1 , wherein the first non-reactive spacer filler is a carbon black, graphite, graphene, a pigment, quartz, a carbon nanotube, or combination thereof.
9. The composition of claim 1 , wherein the second filler comprising one or more silanol groups is silica.
10. The composition of claim 1 , wherein the curing catalyst is selected from the group consisting of lead naphthenate, cobalt naphthenate, zinc naphthenate, sodium naphthenate, iron-2-ethylhexoate, lead 2-ethylhexoate, chromium octoate, dibutyltin dibenzoate, dibutyltin adipate, lead sebacate, dibutyltin dilactate, dibutyltindiacetate, dibutyltindilaurate, lead octoate, tin ricinoleate, cobalt hexoate, aluminum acetyl-acetonate, zirconium acetoacetate, dioctyltindimaleinate, dibutyltin diacetate, and stannous octoate, or a combination thereof.
11. The composition of claim 1 , wherein the composition comprises
a) 100 parts by weight of a fluorosilicone;
b) from about 3 to about 10 parts by weight of a silicon-based crosslinker;
c) from about 2 to about 8 parts by weight of a first non-reactive spacer filler;
d) from about 8 to about 14 parts by weight of a second filler comprising one or more silanol groups; and
e) from about 0.03 to about 0.15 parts by weight of a curing catalyst.
12. The composition of claim 1 , wherein the composition comprises
a) 100 parts by weight of a fluorosilicone;
b) from about 3 to about 10 parts by weight of a silicon-based crosslinker;
c) from about 2 to about 8 parts by weight of carbon black;
d) from about 8 to about 14 parts by weight of fumed silica; and
e) from about 0.03 to about 0.15 parts by weight of a curing catalyst.
13. A method comprising the steps of:
a) applying the composition of claim 1 to a surface; and
b) curing the applied composition.
14. A composition comprising:
a) 100 parts by weight of a fluorosilicone;
b) from about 2 to about 20 parts by weight of a silicon-based crosslinker;
c) a first amount of a first non-reactive spacer filler;
d) a second amount of a second filler comprising one or more silanol groups; and
e) from about 0.01 to about 5 parts by weight of a curing catalyst,
wherein the composition has a tensile strength of at least 200 psi after being exposed to 600° F. in air for 60 minutes,
wherein a weight ratio of the first non-reactive spacer filler to the second filler comprising one or more silanol groups is from about 1:0.5 to about 1:7.
15. The composition of claim 14 , wherein the composition has an elongation of at least 300% after being exposed to 600° F. in air for 30 minutes.
16. A kit comprising:
a) 100 parts by weight of a fluorosilicone;
b) from about 2 to about 20 parts by weight of a silicon-based crosslinker;
c) from about 0.1 to about 40 parts by weight of a first non-reactive spacer filler;
d) from about 0.1 to about 40 parts by weight of a second filler comprising one or more silanol groups; and
e) from about 0.01 to about 5 parts by weight of a curing catalyst; and
f) a container containing parts a)-e),
wherein a weight ratio of the first non-reactive spacer filler to the second filler comprising one or more silanol groups is from about 1:0.5 to about 1:7.
17. A composition comprising
a) 100 parts by weight of a fluorosilicone;
b) from about 2 to about 16 parts by weight of a first non-reactive spacer filler;
c) from about 0.03 to about 0.15 parts by weight of a curing catalyst;
d) from about 0.1 to about 20 parts by weight of a silanol resin and/or an untreated silica;
e) from about 3 to about 10 parts by weight of a silicon-based crosslinker; and
f) from about 8 to about 14 parts by weight of a second filler comprising one or more silanol groups,
wherein a weight ratio of the first non-reactive spacer filler to the second filler comprising one or more silanol groups is from about 1:0.5 to about 1:7.
18. The composition of claim 17 , wherein the first non-reactive spacer filler is carbon black or a pigment, and wherein the second filler is fumed silica.
19. A method comprising the steps of:
a) applying the composition of claim 17 to a surface; and
b) curing the applied composition.