DUAL CURABLE ETHYLENE PROPYLENE DIENE POLYMER RUBBER COATING USING A PHOTOINITIATOR AND A PEROXIDE

摘要

A durable ambient light curable waterproof liquid rubber coating with volatile organic compound (VOC) content of less than 450 grams per liter made from ethylene propylene diene terpolymer (EPDM) in a solvent, a photoinitiator, an additive, pigments, and fillers, and a co-agent and a method for making the formulation, wherein the formulation is devoid of thermally activated accelerators.

主权项

1. A durable ambient light curable waterproof liquid rubber formulation with a volatile organic compound content of less than 450 grams per liter, comprising:
a. a low viscosity liquid intermediate rubber formulation with a saturated backbone of propylene, a saturated backbone of ethylene, and an unsaturated diene with ultra violet activated sites capable of crosslinking with or reacting with a free radical or a free radical on another terpolymer, comprising:
(i) a first portion of ethylene propylene diene terpolymer (EPDM) wherein the ethylene propylene diene terpolymer (EPDM) is 50 weight percent to 99 weight percent of a total amount of ethylene propylene diene terpolymer;(ii) a first portion of solvent, wherein the first portion of solvent is 33 weight percent to 67 weight percent of a total amount of solvent used in the resulting durable ambient light curable waterproof liquid rubber formulation;(iii) a second portion of ethylene propylene diene terpolymer (EPDM), wherein the second portion of ethylene propylene diene terpolymer (EPDM) is 0.1 weight percent to 50 weight percent of the total amount of ethylene propylene diene terpolymer (EPDM); and(iv) a second portion of solvent, wherein the second portion of solvent is 33 weight percent to 80 weight percent of a total amount of solvent used in the resulting durable ambient light curable waterproof liquid rubber formulation; b. 0.1 to 15 weight percent of a peroxide based on the total weight of the resulting dual curable waterproof liquid rubber formulation wherein the peroxide comprises at least one of: a peroxyketal, a peroxyester, a dialkyl peroxide, a peroxy carbonate, or an azo initiator; and c. 0.1 weight percent to 10 weight percent of a photoinitiator devoid of thermally activated accelerators to the low viscosity liquid intermediate rubber formulation to generate free radicals that react with the active sites of the unsaturated diene; forming a dual curable waterproof liquid rubber formulation, wherein the dual curable waterproof liquid rubber formulation is adapted to form a waterproof seal on a substrate in the presence of ultraviolet light and heat.