  We establish curvature estimates and a convexity result for mean convex
properly embedded $[\varphi,\vec{e}_{3}]$-minimal surfaces in $\mathbb{R}^3$,
i.e., $\varphi$-minimal surfaces when $\varphi$ depends only on the third
coordinate of $\mathbb{R}^3$. Led by the works on curvature estimates for
surfaces in 3-manifolds, due to White for minimal surfaces, to Rosenberg, Souam
and Toubiana, for stable CMC surfaces, and to Spruck and Xiao for stable
translating solitons in $\mathbb{R}^3$, we use a compactness argument to
provide curvature estimates for a family of mean convex
$[\varphi,\vec{e}_{3}]$-minimal surfaces in $\mathbb{R}^{3}$. We apply this
result to generalize the convexity property of Spruck and Xiao for translating
solitons. More precisely, we characterize the convexity of a properly embedded
$[\varphi,\vec{e}_{3}]$-minimal surface in $\mathbb{R}^{3}$ with non positive
mean curvature when the growth at infinity of $\varphi$ is at most quadratic.
