Series: Construction of solvent-free epoxy coatings in the ship's freshwater/drinking water tank (III)

17.
the cabin and the coating.
1)
Warm up the cabin. Winter construction must be to warm the cabin, solvent-free epoxy generally requires steel plate temperature of
10
or more
China
. Depending on the size of the cabin, prepare suitable warm-up equipment. According to small editors see, the site mainly uses high-power heating fan for heating, there is also the use of welding preheating track-type ceramic heating sheet, part of the corner temperature can not meet the requirements of the use of ordinary household heating auxiliary heating, individual repair points also use iodine tungsten lamp roasting heating. Of course, ceramic heating tablets, household electric heating and tungsten iodine lamps are not recommended for safe heating measures, the actual use of caution

room insulation. For chambers with an outer wall exposed to the atmosphere, thermal insulation is recommended, otherwise heat will soon be lost to the atmosphere. Small editor on-site to see the common insulation measures are welded preheated track-type heating sheet wrapped in the outer wall for heating or insulation, there are some wild roads using electric blankets, in short, this is some less professional insulation and heating methods, welcome friends to add
3)
paint heating. The best way to warm up is to prepare a small container at the spray site, place the paint in the container and warm the container. According to personal experience, the coating temperature to
25
degrees Celsius or more is the most appropriate, of course, pre-coated paint does not have to add too high temperature, so as not to cure too early.
18.
Mix and stir the paint.
1)
Mix and stir when pre-coated and patched. Choose whether to mix in small amounts or in whole buckets, depending on the size of the pre-coated or patched dosing, and provision as many times as possible. When mixing a small amount, make sure that the scale is correct, measure the proportion of each ingredient with a ruler, if the pre-coated dosing is relatively large, you can mix and stir in the whole barrel, and then divided into pre-coated personnel. During winter construction, the pre-coated paint can not be heated too high, generally
20
degrees Celsius or so, there have been pre-coated paint because the heating temperature is too
high to quickly exceed the life of the tank can not be
used; Spraying construction is a whole barrel mixing, power tools stirring. In order to reduce viscosity, it is important to warm the coating to
25
degrees Celsius or more during winter construction, reduce the viscosity of the coating, ensure that the coating can be normally atomized

solvent-free epoxy curing speed is very fast, and during the reaction process will release a lot of heat. If the temperature of the outer surface of the coating barrel will rise rapidly after mixing, the coating will become sticky, the surface will appearbubble
"
situation, carefully look at the paint abovesmoke
"
, commonly known as

smoke
"
, the next day will find that the paint has solidified, the paint inside the honeycomb appearance.
photo
27
: Stir separately for
A
Photo
28
: Then individually stir for
B

Photo
29
: Pour
B
into
A
IngredientsPhoto
30
: Power tool fully stirs
Photo
31
: Mixing a large bucket of paint into several small barrels for pre-painting
Photo
32
: Mixing a large bucket of paint into several small barrels for pre-painting
19.1
degree pre-painting.
1)
Due to the fast solvent-free epoxy drying time and the short coating interval, it is different from other constructions (e.g., ballast cabin construction process for spraying
plus
once pre-coated
-plus




repair), the general freshwater cabin to implement a once pre-coated
plus
once sprayed
plus
two-degree pre-coated
plus
second-degree spraying
plus
repair process;
2)
paint bucket. On-site commonly used pre-coated paint buckets are a curing agent bucket set a layer of plastic film (or buy some plastic bags), the edge with tape sticky, more practical and convenient and easy to obtain materials. Change a plastic film after each run-out and do not always use a plastic bag, as the paint on the bottom is likely to have reached the end of the tank life and cannot be used;
3)
brush roller. Select the quality of brushes and rollers that are not easy to lose hair, the experience is to use the roller roller in the tape back and forth a few back and forth, will be hair off sticky; If in the pre-painting process found that there is hair removal, should take the paint has not been hard-dried, directly remove the hair off;
4)
from top to bottom for pre-painting, the main pre-coated welds, over-welding holes, free edge, ball flat steel back and ball head, rebar plate back and other difficult to spray parts. Large plane position automatic weld can also not do pre-painting, to avoid the thickness of super-thick;
5)
General primer pre-painting can not use rollers
(
rollers in the roughness of the surface may lead to bridging, only over-welding holes can use rollers
)
, but the construction efficiency of the brush is too slow, there is a practice on site I think more practical, first with rollers paint in the pre-painting position, and then with the brush overall back and forth, so as to improve efficiency and quality assurance;
6)
coating should adequately cover the pre-coated area, and there can be no accumulation, flow, thick edges and other defects. Each pre-coated person is required to carry a cloth with him or her, for the paint that drips on the steel plate during the pre-painting process to wipe off in time;
7)
For the compartment where the bottom layer of scaffolding is completely ceilinged, the pre-painting time in the floor area is very fine, because solvent-free epoxy curing speed is very fast, after shooting can not stop the gun
(
once stopped The gun will be washed, otherwise the paint inside the pump will quickly cure, resulting in the inability to shoot again
)
, according to personal experience, a six-layer scaffolding compartment, when the gunman sprayed from top to bottom to the third floor when the workers to carry out the final floor cleaning after pre-painting (because the bottom layer of scaffolding all ceiling, the floor will not produce paint fog), pre-painting to end the evacuation chamber, the gunman can complete the spray construction.
Photo
33
: Pre-Painting Status
Photo
34
: Pre-Painting Status
Photo
35
: Pre-Coated Status
Photo
36
: Pre-Coated Status