The new resin is used to make solvent-based odorless indoor closed primers

the United States, solvent-based products still account for 25% of the
market share of
. Why should this be the case in a situation where numerous national and regional regulations on organic volatiles have been implemented in recent years? The contractors gave the answer. They know that in certain situations, solvent-based closed primers cover obvious spots
(
such as watermarks, nicotine, logos, smoke marks
)
is far better than water-based closed primers, and the adhesion to problematic surfaces is excellent, paint film fluidity and durability are very good. This is a solvent-based closed primer compared to water-based closed primer some unique advantages, this paper will focus on this. To help paint formulaters prepare solvent-based coatings without compromising quality,
Eliokem
has developed a new resin that dissolves in "tasteless" solvents, and
Eliokem
has an excellent team of paint formulaters to help meet the needs of our customers for coatings.background
1has earned its rightful reputation since odorless closed primers entered the U.S. market in1997. It combines the extremely effective anti-fouling capabilities of traditional solvent-based products with the low odor comfort that is usually found in water-based products. A good primer must be able to adapt to a variety of substrates that may be encountered in indoor environments, such as dry walls, cement, concrete, plaster, wood, siding, old paint, metal, fiberboard, etc. Especially in the renovation, the surface encountered often has a variety of spot stains, such as water leakage formed marks, smoke marks, nicotine, ink and other water-soluble stains, as well as tar, acid and other solvent soluble stains.states are pushing stricter environmental regulations to reduce the organic volatility tolerance level for specialty coatings, closures and primers from the current
450g/L
to
350g/L
. This put more pressure on manufacturers and resin suppliers. In order to reduce organic volatiles in the coating, the solvent components in the formulation must be removed. The result is an increase in the relative content of solids in the formula
(
pigments
plus
binding agent
)
, which adversely affects viscosity. The increase of resin content will mainly increase the high shear viscosity, which has a great effect on spraying. The increase in pigment content mainly affects low shear and medium shear viscosity, which is very important for fluidity, leveling and anti-flow hanging. When designing primers with small odors and low organic volatiles, if you plan to increase the amount of binders, you need a resin with a low viscosity that dissolves in a isomeric alkane solvent with a small odor. The developed

®
Ultra 350
has low viscosity and excellent solubility in isomerated alkane solvents.
The Plyoway Ultra G-20
is a fluid resin with strong adhesion to prevent subsidion.。 Ultra 350
and
Ultra G-20
are
with
®
isopar
G.
Isopar G
is also more safe than the typical solvent used in solvent-based systems. The following discussion of the number of breaths
(ACI)
shows that using
IsoparG
requires less air flow than other solvent-based systems
(
e.g.

).number of
(ACI) 2, 3 all solvents should be used with care. Solvents are hazardous, and although the degree of harm may vary considerably depending on the type of solvent selected and the painting conditions, the problem persists. "How do you know which solvents are less harmful?"the use of solvent-based primers indoors increases their hazards, as volatiles accumulate in the air. One way to reduce the amount of solvents in the air is to use a fan for air conditioning. The
ACI
solvent is an indicator of its safety, and the lower
ACI
, the less air flow is required.。 ACI
calculated based on the solvent content in the primer, the volume of the room to be painted, the volatility of the solvent and the amount of primer to be used. Figure
1
shows the
ACI
, which is made with different solvents, calculated on the basis of
3500
feet
3
room volume and
375
feet
2/
gallon primer, solvent-based primer solvent content of
350g/L
, water-based primer contains
50g/L
butyl glycol.data show that the use of mineral alcohol primers needs ventilation
6 to

7
times per hour, requiring greater ventilation, while the use of
Isopar G
substrates only need to change air
1
times to
2
times per hour. Finally, the use of water-like primers requires less than 1
per
hour. The data can be explained from another angle: the
Isopar G
is
3 to

times safer than mineral alcohol
s,
5 to
times higher than toluene and
6
times higher than mineral alcohols. However, no matter what primer is used, proper ventilation is always a good idea.Odor-free closed primer with
Plioway
resin and
Isopar G
solvents has the following advantages:
has the advantages of solvent

-based products without the health hazards of ordinary solvents
;。 Figure
1

ACI (
per litre of coatings) made from solvent-based coatings and standard water-based coatings
made with different solvents
.。 Plioway
resin When making odorless solvent-based closed primers, resins with excellent solubility in small odor isoencarbon solvents are required.
Eliokem
realized this and developed two resins that could easily meet this requirement: the -
Ultra 350
resin, a low-viscosity Newtonian resin that dissolves in odorless isomer-free alkane solvents and in many other solvents. It can be used to make coatings with organic volatiles
less than 350g/L
350g/L. .
Ultra G-20
resin is a fluid-dispensing resin dissolved in odorless isomeric acid solvent
, and when dissolved in desolate solvent or isomerated alkane solvent
, the gel it forms gives the finished coating excellent fluid properties. 。 Features and advantages the formation of a strong adhesion and no-stress coating film Plioway
resin dissolved fine particles allow wet primers to penetrate deep into the substrate. Use these resin primers to form a stress-free coating film. Unlike alfalic acid primers, it does not interlink (

and therefore does not shrink
when
. These properties allow
Plioway
base primer to adhere to difficult surfaces for long periods of time. high solubility
Plioway
resins allows primer formulations to use non-aromatic hydrocarbon low odor solvents. The primer does not actually smell when brushed and dried. Traditional alicic acid primers are made with stronger solvents, so they smell large, and in the event of cross-linking, the alicylate resin emits a distinctive residual dry oil odor. These conditions do not
in the
of the Plioway and Plioway resins. widely applicable
-based
Plioway
resin is alkali resistant and can be applied directly to new plaster or cement. The alkalic base primers are destroyed by the alkaline nature of these substrates because they are prone to reactions with alkalis. dry quickly it can be filmed by a simple solvent volatilization, enabling the formulator to make fast-drying primer
(
or even faster than high solids and low volatile paint
)
. The alicylate primer takes a long drying time. can be the molecular
of the Plioway resin has been optimized for excellent spray performance. The system can be used with a wider fan and is evenly sprayed without smoothing. solvent-based closed primer study a the primer was tested as follows:
Odor
(
in-tank odor, divided into
1
level
-8
,
1
Best
)
; High Shear Viscosity
(ASTM D4287)
;
Stommer viscosity
(ASTM D562)
;
solid content
(ASTM D2369)
; s
organic volatile score is calculated according to the measured weight per gallon and solid content press: organic volatility
(g/L) ( 100 -
solid content
) x 10 x
per gallon
/ 8.34
;

Anti-Flow Hanging Performance
(ASTM D4400)
;

Spray Performance
(Graco Ultra 450
Airless Spraying,
0.75
gallon
/
minute electric pump,
50
feet long,
3/8
inch diameter hose,
517
nozzle, Maximum
pressure is approximately
3000
lbs
/
in
2)
;
closed
(
water-coded ink
)
capacity,
10
mil wet film;
and dry walls after
4
hours and
24
hours after drying adhesion
(10
mil wet film,
ASTM D3359
,
X
cut tape test, divided into
0
class
-5
class
,5
class best
)
. results
1
1 show that
plioway
base primer performs well and is generally balanced.
Ultra 350
and
Ultra G-20
formulations are odor-free in all practical applications, while ordinary products have a strong odor. High shear viscosity and Stommer viscosity are in the range of good spraying and anti-flow hanging, while ordinary products spraying is not good and anti-flow hanging performance is general. Finally,
Plioway
products have a stronger adhesion to dry walls. 。 Table
1 . . .
New standards for solvent-based primers.