ANTI-FOGGING AND BACTERIA-RESISTANT LIQUID SILICONE RUBBER ADDITIVES AND THE APPLICATIONS THEREOF

1 . An anti-fogging and bacteria-resistant liquid silicone rubber additive composition, comprising:

20-30 wt. % of a silicone network elastomer;

30-70 wt. % of an anti-fogging network-forming surfactant, wherein the anti-fogging network-forming surfactant includes a hydrophilic component comprising hydrophilic groups, and a carbon-based and/or silicone-based hydrophobic component such that the surfactant is capable of integrating with the silicone network elastomer so as to form a partial interpenetrative network; and

4-10 wt. % of a Si—H reactive crosslinker, comprising multiple OH functionality;

wherein the anti-fogging network-forming surfactant is Si—H reactive so as to be crosslinked and enmeshed with the silicone network elastomer by the Si—H reactive crosslinker, forming the partial interpenetrative network.

2 . The composition of claim 1 , wherein the anti-fogging network-forming surfactant is selected from dimethylsiloxane-ethylene oxide block copolymer, polyglycerol, ethylene oxide or combinations thereof; and the hydrophilic groups are selected from polyhydroxyl group, polyethylene oxide group or combinations thereof.

3 . The composition of claim 1 , wherein the silicone network elastomer is a silicon or carbon network elastomer crosslinked with polyglycerol chains and/or polyether chains, enhancing the compatibility of the elastomer with a silicone matrix.

4 . The composition of claim 3 , wherein the silicone network elastomer is to provide a scaffold to capture the anti-fogging network-forming surfactant so that the migration rate of the anti-fogging network-forming surfactant is reduced, achieving a durable anti-fogging effect against washing, rubbing and increased temperature.

5 . The composition of claim 3 , wherein the silicone network elastomer is selected from cetyl diglyceryl tris(trimethylsiloxy)silylethyl dimethicone, polyglycerin-10, dimethicone (and) dimethicone/polyglycerin-3 crosspolymer, (hydroxypropyleneoxypropyl)methylsiloxane-dimethylsiloxane copolymer, cyclopentasiloxane (and) dimethicone/PEG-10/15 crosspolymer, or polyglyceryl-3 polydimethylsiloxyethyl dimethicone.

6 . The composition of claim 1 , wherein the Si—H reactive crosslinker is selected from sorbitol, maltitol, isomalt, galactitol, mannitol, xylitol, sucrose, DMPA, PEAE, pentaerythritol, or any combination thereof.

7 . A method of preparing the anti-fogging and bacteria-resistant liquid silicone rubber additive composition of claim 1 , comprising:

mixing the silicone network elastomer with the anti-fogging network-forming surfactant and the Si—H reactive crosslinker to obtain a mixture;

subjecting the mixture to a reaction process to facilitate crosslinking and incorporation of the components; and

isolating and purifying the resulting anti-fogging and bacteria-resistant liquid silicone rubber additive composition.

8 . The method of claim 7 , wherein the reaction process comprises heating, stirring, or ultrasonic treatment to ensure thorough mixing and homogeneous distribution of the components within the mixture.

9 . A method of fabricating an anti-fogging, antibacterial and transparent liquid silicone-based film, comprising:

adding the anti-fogging and bacteria-resistant liquid silicone rubber additive composition of claim 1 to a transparent liquid silicone elastomer precursor to obtain a mixture;

removing air bubbles from the mixture; and

vulcanizing the mixture for film making to obtain an anti-fogging, antibacterial and transparent liquid silicone-based film;

wherein the step of vulcanizing migrates hydrophilic groups of the hydrophilic component toward the surface of the film to lower the film's surface tension.

10 . The method of claim 9 , wherein the anti-fogging, antibacterial and transparent liquid silicone rubber film has a bacterial adherence reducing rate ranging from 95% to 99% and possesses food contact safety.

11 . The method of claim 9 , wherein the surface tension of the film is reduced to that the film has a water contact angle ranging from 60 to 65 degrees.

12 . The method of claim 9 , wherein the step of vulcanizing is conducted at a temperature ranging from 140 to 250° C. for a duration of 10 seconds to 180 seconds, ensuring optimal cross-linking and incorporation of the anti-fogging network-forming surfactant.

13 . A silicone-based film produced using the anti-fogging and bacteria-resistant liquid silicone rubber additive composition of claim 1 , wherein the film exhibits durable anti-fogging and antibacterial properties, for high transparency, hygiene, and maintaining visibility.

14 . A medical device, food package, or optical lens having the silicone-based film of claim 13 formed thereon.