Adhesive material with improved bonding performance to a wet substrate and methods for preparing the same

1. An adhesive material with improved bonding performance to a wet substrate comprising:

a first component selected from a polysiloxane-based adhesive, or a polyurethane-based adhesive;

a second component of a catechol-containing polymeric additive, the catechol-containing polymeric additive comprising a reaction product of polyvinylpyrrolidone with 3′,4′-dihydroxy-2-chloroacetophenone, the weight ratio of polyvinylpyrrolidone to 3′,4′-dihydroxy-2-chloroacetophenone ranging from 10:1 to 1:1;

the adhesive material being a mixture of at least the first component and the second component, wherein the second component is approximately 1 wt. % to 10 wt. % of the first component.

2. The adhesive material of claim 1 , further comprising an inorganic filler in an amount of approximately 30 wt. % to approximately 70 wt. %.

3. The adhesive material of claim 2 , wherein the inorganic filler is selected from one or more of fumed silica, precipitated silica, nano calcium carbonate, precipitated calcium carbonate, ground calcium carbonate, iron oxide, titanium dioxide, carbon black, mica, or aluminum oxide.

4. The adhesive material of claim 1 , wherein the second component is represented by the following formula (I):

wherein the ratio m/n is between approximately 14/1 to 2/1 and the total value of m+n is between approximately 30-16000.

5. The adhesive material of claim 1 , further comprising one or more additives selected from calcium oxide, magnesium oxide, calcium chloride (anhydrous), magnesium chloride (anhydrous), sodium sulfate (anhydrous), magnesium sulfate (anhydrous).

6. The adhesive material of claim 1 , wherein the polysiloxane has a formula of [R 2 SiO] n , where R is an organic group selected from ethyl, methyl, or phenyl; n is an integer between 200 and 500.

7. The adhesive material of claim 1 , wherein the second component is approximately 1 wt. % to 5 wt. % of the first component.

8. A method of preparation of a silicone sealant with improved adhesive performance on a wet substrate, the method comprising:

reacting polyvinylpyrrolidone (PVP) with 3′,4′-dihydroxy-2-chloroacetophenone to synthesize a catechol-containing polymeric additive;

forming a base material by mixing the catechol-containing polymeric additive with a liquid polyorganosiloxane polymer and a branched silicone oil, wherein the amount of the polymeric additive is in the range of 1-10 wt % of the base material;

mixing the base material with a cross-linking agent and a catalyst to synthesize a silicone sealant with improved adhesive performance on a wet substrate.

9. The method of claim 8 , wherein the molecular weight of the PVP is approximately 3500 to 1760000 and wherein the PVP is a linear or a cross-linked form.

10. The method of claim 8 , further comprising using a solvent in the reaction of polyvinylpyrrolidone with 3′,4′-dihydroxy-2-chloroacetophenone, wherein the solvent comprises water, methanol, ethanol, isopropanol, or combination thereof.

11. The method of claim 8 , wherein the PVP and the 3′,4′-dihydroxy-2-chloroacetophenone have a weight ratio of 10:1 to 1:1.

12. The method of claim 8 , wherein the catechol-containing polymeric additive is represented by the following formula (I):

wherein the ratio m/n is between approximately 14/1 to 2/1 and the total value of m+n is between approximately 30-16000.

13. The method of claim 8 , further comprising purifying the catechol-containing polymeric additive prior to mixing with the polysiloxane.

14. The method of claim 8 , further comprising an inorganic filler selected from one or more of fumed silica, precipitated silica, nano calcium carbonate, precipitated calcium carbonate, ground calcium carbonate, iron oxide, titanium dioxide, carbon black, mica, or aluminum oxide.

15. The method of claim 8 , wherein the cross-linking agent comprises vinyltrimethoxysilane (ViTMS), vinyltriethoxysilane (ViTES), dimethoxydimethylsilane (DMDMS), vinylmethyldimethoxysilane (ViMDMS), triethoxymethyl silane (TEMS), poly(methyltriethoxysilane) (polyMTES), methyltrimethoxysilane (MTMS), tetraethyl orthosilicate (TEOS), methyltris(methylethylketoxime)silane (MTMOS), vinyltris(methylethylketoximine)silane (ViTMOS), or phenyltris(methylethylketoxime)silane (PhTMOS).

16. The method of claim 8 , wherein the catalyst comprises tetrabutyl titanate, isopropyl titanate, or a titanium chelate complex.

17. The method of claim 8 , wherein the amount of the polymeric additive is in the range of 1-5 wt % of the base material.