LIQUID COMPOSITION ADDITIVE TO REDUCE CURING TIME OF SURFACE COATINGS

ADDITIF LIQUIDE SERVANT A REDUIRE LE TEMPS DE DURCISSEMENT DE REVETEMENTS DE SURFACE

English Abstract

A liquid composition, active curing additive for water or solvent borne surface coatings and sealants such: latex products, paints, putties, caulks, sports track and court construction, asphalt or coal tar seal coating, asphalt paving, micro-seal, roof tars, asphalt emulsions, crack sealants, and the like is provided. The additive functions to significantly reduce the amount of time required for the surface coating to cure and thereby allows the coated or sealed surface to be quickly returned to service. Preferably, the additive is composed of a composition of fly ash, hydrous ammonia, water or solvent, and bentonite. This formulation, when added to a liquid surface sealant or coating, will create an active process within the film of the said sealant or coating which draws water out of the film extremely fast, thereby reducing the amount of time required for the surface coating or sealant to cure.

French Abstract

Additif liquide de durcissement actif pour revêtements et produits d'étanchéité de surface à base d'eau ou de solvant, comme les produits au latex, les peintures, les mastics, les produits de calfeutrage, les pistes et terrains de sport, les revêtements d'étanchéité bitumés ou goudronnés, les revêtements en asphalte, les micro-joints d'étanchéité, les goudrons de toit, les émulsions d'asphalte, les produits d'étanchéité pour fissures et d'autres produits similaires. L'additif permet de réduire de façon importante le temps de durcissement du revêtement de surface, ce qui permet de remettre rapidement en service la surface revêtue ou scellée. L'additif est de préférence composé de cendres volantes, d'ammoniac hydraté, d'eau ou de solvant et de bentonite. Cette préparation, lorsqu'elle est ajoutée à un produit d'étanchéité ou à un revêtement de surface liquide, enclenche un processus actif à l'intérieur du film de produit d'étanchéité ou de revêtement de surface, qui extrait l'eau du film extrêmement rapidement, ce qui réduit le temps de durcissement du revêtement ou du produit d'étanchéité de surface.

Claims

WHAT IS CLAIMED IS:

1. An active curing additive for reducing the curing time of surface coatings
and sealants
comprising:

a mixture of a pozzolanic powder, an ammonium addictive, and bentonite,

wherein said ammonium additive is selected from the group consisting of
hydrous
ammonia, ammonia sulfate, and ammonia chloride, and

wherein said pozzolanic powder is selected from the group consisting of fly
ash,
gypsum, Portland cement, and calcium carbonate; and solvent.

Description

CA 02544468 2006-04-21
BACKGROUND OF THE INVENTION
[O1] This patent application is a continuation-in-part of and claims priority
from pending
application serial number 10/829,759 filed on April 22, 2004. This patent
application incorporates
by reference application serial number 10/829,759 as if it were fully printed
herein.
[02] The present invention relates to an active curing additive for water or
solvent borne surface
sealants or coatings. More particularly, the present invention relates to an
active curing additive for
water or solvent surface sealants and coatings such as latex products, paints,
putties, caulks, sports
track and court construction, asphalt or coal tar seal coating, asphalt
paving, micro-seal, roof tars,
asphalt emulsions, crack sealants, and the like. In some situations, the
drying or cure time for a
particular coating is critical. For example, asphalt parking lots must be
coated to retard oxidation
and protect the surface from harmful automotive fluids. However, closing a lot
creates considerable
problems for the business customers and owners. Customers who must park at a
distance from the
business are inconvenienced and this adversely affects sales.
[03] Currently, the minimum industry cure time for a parking lot seal coating
is 24 to 48 hours.
Further, a location may be subsequently closed to apply painted stripes to the
coated surface. This
causes additional customer inconvenience.
[04] The present inventive active curing additive, when added to such a
surface sealant or paint,
allows traffic to be reintroduced to a parking lot within 2 to 4 hours of the
final application coat. The
faster cure time of the present invention allows for striping to be applied
within an hour or two of the
final coat thereby eliminating not only a second customer inconvenience, but
eliminating a second
trip by the application contractor to the job site. As may be easily seen, the
reduced cure and drying
times of the present invention allows the contractor to complete more jobs per
unit of time, generate
greater revenues with fewer labor costs, and provide greater customer
satisfaction.
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CA 02544468 2006-04-21
[OS] The present invention provides a longer lasting coating film which does
not bleed into or
smudge onto the painted stripes. Additionally, the present invention may be
used with traffic paint
for stripes. The same advantages noted in the use of the present invention as
a parking lot sealant
result when used as a stripe or traffic paint, i.e., quicker cure and drying
times in humid conditions
resulting in greater profits and added convenience to the public.
[06] Furthermore, the inventive active curing additive reduces curing time in
other water or
solvent sealants and coatings such as latex products, paints, putties, caulks,
sports track and court
construction, asphalt or coal tar seal coating, asphalt paving, micro-seal,
roof tars, asphalt emulsions,
crack sealants, and the like which all require an extended cure time. This
cure time can be shortened
by the active curing process triggered by the inventive active curing additive
resulting in reduced
down time for the customer and more productivity for the contractor.
SUMMARY OF THE INVENTION
[07] An active curing additive which reduces cure time is provided by a
mixture of water or
solvent borne surface sealants or coatings; a pozzolanic powder such as fly
ash, gypsum, Portland
cement, lime or calcium carbonates; an ammonium dispersing composition, such
as hydrous
ammonia, ammonium chloride; ammonium sulfate; and bentonite. Water or solvent
is utilized to
assist in mixing the separate components. Various colorants or pigments may be
further added to
provide the appropriate coloration for the sealant or paint.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[08] The present inventive active curing additive may be packaged in 2, 30,
50, 250, and 4000
gallon containers for ultimate addition of an amount equal to 2% to 6% mix
ratio to the coating or
sealant to be employed. Such coating or sealant may be selected from a number
of water or solvent
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CA 02544468 2006-04-21
borne surface sealants or coatings such as: latex products, paints, putties,
caulks, sports track and
court construction, asphalt or coal tar seal coating, asphalt paving, micro-
seal, roof tars, asphalt
emulsions, crack sealants, and the like.
[09] The active curing additive is formulated by mixing 0.5 to 7.0 pounds of a
pozzonlanic
powder such as fly ash with one to two gallons of water or solvent and 0.5 to
5.0 ounces of an
ammonium additive such as hydrous ammonia. Solvents which may be used in the
mixture include
toluene, mineral spirits, xylene, or similar petroleum-based solvents.
Colorant or pigment may be
added to color the additive in a variable amount to achieve the desired shade
or tone needed.
Bentonite in the amount of 0.25 to S.0 ounces is added to achieve a gel form
suspending the entire
mix so that the final product remains one consistent texture and pourable.
[10] These components may be mixed prior to arrival at the job site or mixed
at the job site for
application to the applicable coating or sealant. 'The fly ash may be replaced
with Portland cement,
gypsum, lime, or other pozzonlanic cementitious composition. The quantity of
the pozzonlanic
material may vary depending upon the drying or cure time desired.
[1l] The preferred range for fly ash is 0.5 to 7.0 pounds, most preferably 3.0
pounds, in
approximately two gallons of water with one half once of ammonium additive and
two ounces of
bentonite. The cure time required after application, under standard favorable
conditions, until
coating or sealant may be returned to service is reduced from approximately 24
hours to
approximately 2.5 hours; an approximate 10-fold reduction.
[12] As noted, coloring pigment may be added to the composition. For example,
black powder
pigment (such as carbon black) may be added to the composition to provide a
black sealant for use
on asphalt surfaces. Also, liquid black pigment may also be added to the
composition to provide a
black sealant. Iron oxide may be added to give the sealant a red coloring.
Titanium dioxide may be
used as a white coloring agent. Other colorants may be added as desired.
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CA 02544468 2006-04-21
[13] When the present inventive additive is mixed with a standard striping
paint or other latex
products, the amount of ammonium additive may be decreased and even eliminated
if the particular
paint or latex product has an ammonium component.
[14] While this invention has been described as having a preferred design and
use, it is understood
that it is capable of further modifications, uses andlor adaptations following
in general the principle
of the invention and including such departures from the present disclosure as
come within the known
or customary practice in the art to which the invention pertains and as maybe
applied to the central
features hereinbefore set forth, and fall within the scope of the invention
and the limits of the
appended claims. In particular, although the composition is described as
composed of certain
quantities of the stated ingredients, it should be understood that a vast
range of quantity is
permissible and will still yield the desired results.
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