High performance silicon based coating compositions
A silicon-based coating composition for a wide range of mold surfaces, which composition is formed from a mixture of constituents comprising appropriate portions of silazane, siloxane, and silane, and optionally organic solvent. The composition, after curing, results in an extreme release product that is non-transferable to the finished part, allowing for proper adhesion of coatings or adhesives to the finished surface without additional surface preparation. The cured coatings are ultrathin, having a thickness between 0.1 μm and 3 μm, and having a hardness between about 4H and about 9H.
1. A silicon-based coating composition, comprising:
a. 56% to 76% (w/w of the total composition) polysilazane;
b. 0.7% to 1% (w/w of the total composition) polysiloxane;
c. 1% to 2% (w/w of the total composition) polysilane of a formula (R 1 R 2 Si) n , wherein n is greater than 1, and wherein R 1 and R 2 are the same or different and can be alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl; and
d. 21% to 43% (w/w of the total composition) organic solvent.
2. A silicon-based coating composition, comprising:
a. 7% to 11% (w/w of the total composition) polysilazane;
b. 0.2% to 0.6% (w/w of the total composition) polysiloxane;
c. 5% to 9% (w/w of the total composition) polysilane of a formula (R 1 R 2 Si) n , wherein n is greater than 1, and wherein R 1 and R 2 are the same or different and can be alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl; and
d. 79% to 89% (w/w of the total composition) organic solvent.
3. A cured silicon based coating, the coating formed from a mixture of constituents comprising
a. 45% to 55% (w/w of the total composition) polysilazane;
b. 0.2% to 0.6% (w/w of the total composition) polysiloxane;
c. 1% to 3% (w/w of the total composition) polysilane of a formula (R 1 R 2 Si) n , wherein n is greater than 1, and wherein R 1 and R 2 are the same or different and can be alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl; and
42% to 54% (w/w of the total composition) organic solvent;
wherein the coating is substantially free of Si—H bonds, and
wherein the coating comprises a polymer network comprising Si—O bonds and Si—C bonds.
4. A cured silicon based coating, the coating formed from a mixture of constituents comprising
a. 56% to 76% (w/w of the total composition) polysilazane;
b. 0.7% to 1% (w/w of the total composition) polysiloxane;
c. 1% to 2% (w/w of the total composition) polysilane of a formula (R 1 R 2 Si) n , wherein n is greater than 1, and wherein R 1 and R 2 are the same or different and can be alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl; and
21% to 43% (w/w of the total composition) organic solvent;
wherein the coating is substantially free of Si—H bonds, and
wherein the coating comprises a polymer network comprising Si—O bonds and Si—C bonds.
5. A cured silicon based coating, the coating formed from a mixture of constituents comprising
a. 7% to 11% (w/w of the total composition) polysilazane;
b. 0.2% to 0.6% (w/w of the total composition) polysiloxane;
c. 5% to 9% (w/w of the total composition) polysilane of a formula (R 1 R 2 Si) n , wherein n is greater than 1, and wherein R 1 and R 2 are the same or different and can be alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl; and
79% to 89% (w/w of the total composition) organic solvent;
wherein the coating is substantially free of Si—H bonds, and
wherein the coating comprises a polymer network comprising Si—O bonds and Si—C bonds.
6. A cured silicon-based coating,
the coating formed from a mixture of constituents comprising:
a. 56% to 76% (w/w of the total composition) polysilazane;
b. 0.7% to 1% (w/w of the total composition) polysiloxane;
c. 1% to 2% (w/w of the total composition) polysilane of a formula (R 1 R 2 Si) n , wherein n is greater than 1, and wherein R 1 and R 2 are the same or different and can be alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl; and
d. 21% to 43% (w/w of the total composition) organic solvent;
wherein the coating is substantially free of Si—H bonds, and
wherein the coating comprises a polymer network comprising Si—O bonds, Si—C bonds, and Si—N bonds.
7. A cured silicon-based coating,
the coating formed from a mixture of constituents comprising:
a. 7% to 11% (w/w of the total composition) polysilazane;
b. 0.2% to 0.6% (w/w of the total composition) polysiloxane;
c. 5% to 9% (w/w of the total composition) polysilane of a formula (R 1 R 2 Si) n , wherein n is greater than 1, and wherein R 1 and R 2 are the same or different and can be alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl; and
d. 79% to 89% (w/w of the total composition) organic solvent;
wherein the coating is substantially free of Si—H bonds, and
wherein the coating comprises a polymer network comprising Si—O bonds, Si—C bonds, and Si—N bonds.