--- In papercreters@yahoogroups.com, "ablueprincess" <ablueprincess@...> wrote:
Hi! I am new here but I have studied PC off and on for years and I have a project I am working on that I think PC would be very good for. I am converting a bus to an RV (veggie powered) and on the inside of the bus I need to insulate and have walls. It needs to be light weight, sound absorbing, flame proof or at least retardent, strong, etc. all the bennies of PC but it also needs to be water proof (in case of leaks in the bus shell) or at least have a way to breathe and dry out. The insides of the bus are curved. I am in the destruction phase of the conversion. I am removing a lot of plastic that is molded to the contours of the bus and am thinking I would like to use them as molds for the PC. I need to get or make a mixer (but dont have a rear end of a car laying around so I need to come up with another way of mixing). There are a lot of individual indentions in the ceiling on these types of buses that I will need to spray with PC so I need a sprayer too. What do you people think?
Thanks,
Teresa
Teresa I was looking over freepatentsonline.com and found the following information. Its concerning stucco and not PC but the results might be the same.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention generally relates to a method of making a bonding agent that will bond stucco to plastic surfaces, specifically to plastic rocks.
2. Prior Art
Stucco is a material made of sand, cement, and water. Stucco is applied wet and hardens to a very dense solid. It is almost impossible to get stucco to adhere to smooth plastic surfaces.
The present invention provides a bonding agent that bonds wet stucco to smooth plastic, especially to plastic rocks, by using sand in conjunction with a common pavement sealer or coating.
The patent which the present inventors own, U.S. Pat. No. 7,115,178 (2006), to Schofield, uses a bonding agent of anchor cement, sand, and a concrete bonding adhesive with acrylic fortifier to bond the texturing agent to a plastic rock.
The bonding agent disclosed in this application is more economical, faster and easier to use, and provides a stronger bond. It is also more environmentally friendly because it uses a water-based product.
Adhesive compositions used on artificial rocks usually involve resinous compositions applied to the substrate or mold and do not address bonding stucco to the substrate.
SUMMARY
The present invention pertains to a process of making a bonding agent to bond stucco to smooth plastic surfaces, especially plastic rocks.
In accordance with this invention, the process involves using two common materials to create the bonding agent.
A liquid coal tar or asphalt emulsion is put on a plastic item. The emulsion may be sprayed on or brushed on the item. If the surface is flat, the emulsion may be rolled on. In the present embodiment, the plastic item is rock shaped, and use of a water based asphalt emulsion is preferred as it is more environmentally friendly than the coal tar based coatings.
Immediately after the emulsion is applied to the surface of the plastic item, the item is sprayed with sand, or rolled in sand, or has sand hand thrown onto it. As the emulsion dries, the sand sticks to it. This makes a perfect base on which to apply the wet stucco. After the stucco has set up, (partially dried), it is recommended that the stucco be kept damp, (cured), for one to two days after it has been applied to the plastic rock.
When the stucco dries it is strongly adhered to the sandpaper-like base.
Thus the bonding agent herein described is economical, easy to make and apply, and provides a strong bond between the plastic shaped rock or item and the stucco. The bonding agent of this invention proposes a new and unexpected use for a pavement sealer or coating and sand.
Just thought this info could help!
Bob
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