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US-20260125585-A1 - Two-Component Rapid Cure Adhesive

US20260125585A1US 20260125585 A1US20260125585 A1US 20260125585A1US-20260125585-A1

Abstract

The present teachings provide for an adhesive formulation comprising a part A with an epoxy resin, and a part B with an acidic phosphorous constituent, wherein the adhesive has a T-Peel of at least about 2.5 N/mm as measured in accordance with ASTM D1876.

Inventors

  • Ira Miller
  • Michael Czaplicki

Assignees

  • ZEPHYROS, INC.

Dates

Publication Date
20260507
Application Date
20230425

Claims (20)

  1. 1 : A curable adhesive formulation comprising: a part A with one or more epoxy resins; a part B with an acidic phosphoric constituent; wherein the adhesive includes one or more of calcium carbonate, minerals, reinforcing fibers, hydrophobic silica, or any combination thereof; and wherein the cured adhesive provides for assemblies that have a lap shear of at least about 15 MPa as measured in accordance with EN 2243-1.
  2. 2 : A curable adhesive formulation comprising: a part A with one or more epoxy resins; a part B with an acidic phosphoric constituent; wherein the cured adhesive has a T-Peel of at least about 2.5 N/mm as measured in accordance with ASTM D1876.
  3. 3 : The adhesive of claim 2 , wherein the cured adhesive provides for assemblies that have a lap shear of at least about 15 MPa as measured in accordance with EN 2243-1.
  4. 4 : The adhesive of claim 1 , wherein the acidic phosphoric constituent comprises one or more phosphate esters, phosphoric acid, polyphosphoric acid, phosphorus pentoxide, or any combination thereof.
  5. 5 . (canceled)
  6. 6 : The adhesive of claim 4 , wherein the one or more phosphate esters independently of one another are the reaction products of phosphoric acid and an alcohol; an epoxide group of a phosphate ester precursor (i.e., component not yet reacted with phosphoric acid); a mono-epoxide functional molecule; a glycidyl ether of cashew nutshell liquid (CNSL); a phenyl glycidyl ether; 2-ethylhexyl glycidyl ether; an epoxidized para-tertiary butyl phenol.
  7. 7 - 10 . (canceled)
  8. 11 : The adhesive of claim 1 , wherein part B comprises one or more non-phosphorous containing acids or derivatives, one or more acid anhydride, one or more additives, one or more monomers, or any combination thereof.
  9. 12 . (canceled)
  10. 13 : The adhesive of claim 11 , wherein the adhesive includes calcium carbonate.
  11. 14 : The adhesive of claim 11 , wherein the adhesive includes an elastomeric material.
  12. 15 . (canceled)
  13. 16 : The two-part system of claim 11 , including calcium carbonate present in an amount of from about 1% to about 25% by weight of the part A.
  14. 17 . (canceled)
  15. 18 : The adhesive of claim 11 , including hydrophobic silica.
  16. 19 : The adhesive of claim 11 , including tabular alumina.
  17. 20 - 21 . (canceled)
  18. 22 : The adhesive of claim 1 , including one or more liquid epoxy resins that are, independently of one another, a reaction product of epichlorohydrin and a bisphenol.
  19. 23 : The adhesive of claim 22 , wherein the one or more liquid epoxy resins have an epoxide equivalent weight of from about 100 g/equivalent to about 1000 g/equivalent as measured according to ASTM D1652-97; an epoxide percentage of from about 20 to about 25; and/or a viscosity of from about 10 cP to about 100,000 cP at 25° C. as measured according to ASTM D445.
  20. 24 . (canceled)

Description

FIELD The present teachings relate generally to rapid curing ambient temperature cured 2-component adhesives containing some epoxide functionality while providing improved T-Peel resistance, and adhesion to a range of substrates. The invention employs the use of phosphoric acid and/or phosphate esters and/or other acidic constituents as the primary activator and curing agent to be reacted with a mixture containing epoxide functional materials as the primary co-reactant. BACKGROUND Rapid setting epoxy adhesives, including the category of products referred to as 5-minute epoxies are well known commercially. Generally, they cure quickly, but are not known to have an attractive aggregate property set. To date, there has been a significant trade-off of fast reaction time in exchange for physical property reduction and compromised durable adhesion to a variety of substrates. Various curing agents, hardeners, or activators have been used to create these adhesives commonly found in hardware stores and DIY centers. Although adhesives can be made with high shear strength, their use as assembly adhesives in manufacturing and durable repair solutions is limited due to their lack of peel resistance with one common evaluation method being the T-Peel test. This lack of peel resistance limits uses where bending, peeling, and off-axis loading might be important factors. In addition, adhesion quality varies typically for a range of substrates with inconsistent lap shear strength per substrate type as a manifestation of this phenomenon. Notwithstanding the above teachings, there remains a need for rapid cure adhesives with an appropriate blend of particulate tougheners and flexibilizers such that the right blend of an immiscible elastomeric toughening phase with sufficient matrix plasticization results in improved physical characteristics. The present teachings provide one or more of the above-mentioned benefits. The adhesive materials of the present teachings may be utilized to provide a rapid cure adhesive with one or more of improved peel resistance, improved lap shear and improved adhesion over a variety of substrates, including when contamination is present. SUMMARY The present teachings provide for an adhesive comprising a part A with an epoxy resin, and a part B with an acidic phosphoric constituent. The cured adhesive has a T-Peel of at least about 2.5 N/mm as measured in accordance with ASTM D1876. The teachings herein are further directed to a curable adhesive formulation comprising a part A with one or more epoxy resins, and a part B with an acidic phosphoric constituent. The adhesive includes one or more of calcium carbonate, minerals, reinforcing fibers, hydrophobic silica, or any combination thereof. The teachings herein are further directed to a curable adhesive formulation comprising a part A with one or more epoxy resins, and a part B with an acidic phosphoric constituent. The cured adhesive has a T-Peel of at least about 2.5 N/mm as measured in accordance with ASTM D1876. The cured adhesive may provide for assemblies that have a lap shear of at least about 15 MPa as measured in accordance with EN 2243-1. The acidic phosphoric constituent may comprise one or more phosphate esters, phosphoric acid, polyphosphoric acid, phosphorus pentoxide, or any combination thereof. The one or more phosphate esters may include a first phosphate ester, a second phosphate ester, a third phosphate ester, or any combination thereof. The one or more phosphate esters independently of one another may be the reaction products of phosphoric acid and: an alcohol; an epoxide group of a phosphate ester precursor (i.e., component not yet reacted with phosphoric acid); a mono-epoxide functional molecule; a glycidyl ether of cashew nutshell liquid (CNSL); a phenyl glycidyl ether; 2-ethylhexyl glycidyl ether; and/or an epoxidized para-tertiary butyl phenol. The one or more phosphate esters may be present in an amount of about 0.1% to about 30% by weight of the B-side; preferably about 10% to about 14% by weight of the B-side. The at least one phosphate ester may be present in an amount of from about 10% to about 60% by weight of the B-side; preferably about 25% to about 35% by weight of the B-side; more preferably about 28% to about 32% by weight of the B-side. The at least one phosphate ester may be present in an amount of from about 5% to about 40% by weight of the B-side; preferably about 15% to about 25% by weight of the B-side; more preferably about 18% to about 22% by weight of the B-side. The at least one phosphate ester may be present in an amount of from about 10% to about 65% by weight of the B-side; preferably about 35% to about 45% by weight of the B-side. Part B may comprise one or more non-phosphorous containing acids or derivatives, one or more acid anhydride, one or more additives, one or more monomers, or any combination thereof. The one or more additives may include, minerals, reinforcing fibers, fumed silica, or any combi