Constant volume process for managed heat cure of...

B - Operations – Transporting – 05 – D

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B05D 3/02 (2006.01) C08J 3/24 (2006.01)

Patent

CA 2351583

An improved method is disclosed for heat curing a polymerizable impregnant composition (35) within an impregnated porous article (34). The amount of the article's porosity that is filled with the impregnant composition is maximized by applying successively discrete temperature and pressure increments (39) in a system comprising at least one porous impregnated article and a curing chamber having a heat transfer medium therein. During such curing, both temperature and pressure are controlled for an initial duration and subsequently increased by successive increments (39) wherein each successive temperature and pressure exceeds a previous temperature and pressure, respectively, until a maximum temperature and pressure is achieved. The maximum temperature and pressure are maintained until the impregnant composition is cured, resulting in an improved product having greater structural integrity and surface quality.

La présente invention concerne un perfectionnement de procédés de thermodurcissage employés pour une composition d'imprégnation polymérisable à l'intérieur d'un article poreux imprégné. Pour réduire au maximum la quantité de volume poreux à combler au moyen de la composition d'imprégnation, on applique successivement des incréments discrets de température et de pression dans un système comprenant au moins un article poreux imprégné et une chambre de durcissage renfermant un milieu de transfert de chaleur. Pendant un tel durcissage, on contrôle la température et la pression pendant une période initiale, puis on les augments par paliers successifs de façon que chaque palier de température et que chaque palier de pression soit supérieur au précédent, et ce, jusqu'à atteindre un plafond. On conserve ces plafonds de température et de pression jusqu'au durcissement complet de la composition d'imprégnation, ce qui donne un produit amélioré présentant une plus grande intégrité structurelle et une plus grande qualité de surface.

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