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HardenersHardener

LNB17

LNB17 Hardener for polyurethane coatings

Milesi isocyanate hardener (part B) for 2K polyurethane primers/sealers. Dealer: "used as the second component of polyurethane primers". In the Milesi TDS for LBA45 sealer the LNB17 option is the one for excellent filling power and resistance to wrinkling, whereas LNB20 is the one for yellowing resistance. Not described anywhere on the Technocolor site; it turns up as the catalyst for LBA1 primer (50–70 %) under the LUA460–468 acrylic lacquers.

  • Part B for PU primers/sealers
  • LBA1 primer catalysed 50–70 % with LNB17 as the base under LUA460–LUA468 acrylic lacquers (dealer series note)
  • LBA45 clear PU sealer — 50 % by weight / 50.8 % by volume (Milesi TDS)

LNB17 is a component, not a base: proportions are set on the base material's page. No base in the catalog lists a ratio for LNB17 yet — see the table below.

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Answers are based on the LNB17 data and the products it mixes with.

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Mixing matrix

  • LBA1base
    % by weight: 50–70 %dealer

    LBA1 PU primer under LUA460–468 acrylic lacquers, where a well cross-linked primer is required

    LBA1 has no Technocolor page and no hit in the dealer search; source is the series note on the LUA468 page. Toward 70 % gives a tighter cross-link and less risk of the lacquer lifting the primer.

  • LBA45base
    % by weight: 50 %datasheet% by volume: 50.8 %datasheet

    LBA45 clear PU sealer when build and anti-wrinkle are the priority

    Thinner in this recipe: LZC1026 20 % by weight / 23 % by volume. For a non-yellowing version Milesi uses LNB20; for faster, harder film LNB42.

  • LZC1026Thinner
    % by weight: 20 %datasheet% by volume: 23 %datasheet

    Milesi standard (fast) PU reducer for sealers/primers

    Use Milesi LZC PU thinners only; for poor flow-out or bubbles/pinholes add more or slower LZC (e.g. LZC8643/LZC70); in hot weather up to 5 % LTZ40 retarder may be added instead of switching thinner.

Percentages are per 100 parts of component A.

Characteristics

Solids
29 ± 1 %dealer
Density
0.981 kg/ldatasheet
Chemistry
polyisocyanate, probably aromatic (TDI adduct)recommended
Hardener class
hardener for PU primersdealer
Filling and wrinkling
excellent filling power and wrinkling resistancedatasheet
Lightfastness
limited: expect ambering over time; keep out of white or pale non-yellowing systemsrecommended
Pot life
3 hdatasheet
Drying · Conditions
18–22 °C, 65–70 % RH; values for LBA45 + LNB17 (TDS)
Drying · Dust-free
45 mindatasheet
Drying · Touch-dry
90 mindatasheet
Drying · Sand or stack
24 hdatasheet
Drying · Full cure
24 hdatasheet
Drying · Recoat wet-on-wet (h)
2–3 hdatasheet
Drying · Topcoat after (h)
24 hdatasheet
LBA45 mix properties · Ready-to-use solids %
43.5 ± 2 %datasheet
LBA45 mix properties · Ready-to-use viscosity
18 ± 2 sdatasheet
Thixotropy
norecommended
Moisture sensitivity
reacts with air moisture: turns cloudy, thickens, skinsrecommended

Application

Conventional spray

Nozzle
1.8–2.1 mmdealer
Pressure · air
2.1–2.8 bardealer
Spray viscosity
18 ± 2 sdatasheet
Consumption
120–150 g/m²datasheet
Wet film
122–155 µmdatasheet
Coats
1–3 coatsrecommended
Recoat
2–3 h without sanding, later only after sandingdatasheet
Sanding between coats
P320 after 24 h (TDS: sandable after 24 h)dealer

Conventional air spray per Technocolor methods page is the general-purpose method for primers.

HVLP

Nozzle
1.7–2 mmrecommended
Pressure · air
2–2.5 barrecommended

Airless

Nozzle
0.23–0.28 mmdealer
Pressure · fluid
124–145 bardealer

Airless suits primers at high output (methods page).

Airmix (air-assisted airless)

Nozzle
0.23–0.28 mmdealer
Pressure · fluid
41–62 bardealer
Pressure · air
1–1.4 bardealer

Curtain coater

Consumption
120–150 g/m²datasheet

Process and compatibility

Substrate preparation
sand bare wood to P150–P180, de-dust; substrate MC 8–14 %recommended
Goes over
bare wood / stains (after test)
Goes under
LUA460 / LUA461 / LUA462 / LUA463 / LUA464 / LUA465 / LUA468
Don'ts
  • don't use it in acrylic lacquers or white non-yellowing systems — use AC40/AC41/LNB99/LNB20 there
  • don't leave the can open — moisture ruins the hardener
  • don't use the mix past its pot life (~3 h)
  • don't apply below 15 °C

Storage

Packaging
12.5 l; 25 ldealer
Storage temperature
0–35 °C indoors, ventilated, out of sundatasheet
Shelf life
≈12 months in sealed original containerrecommended

Safety: Contains isocyanates and solvents; flammable. Spray booth with extraction, A2P2 respirator (air-fed preferred), nitrile gloves, goggles; may cause respiratory sensitisation. Spark-proof equipment, no smoking. Keep the can tightly closed.

Sources

Value tags: “official”, “dealer”, “catalog”, “schedule” are Technocolor data; “workshop” is from our own datasheets; “recommended” is our engineering estimate (hover to see the reasoning).

Not covered by the sources
  • no official t-color.ru page, not in any Technocolor finishing schedule or catalog transcript
  • NCO content, viscosity, exact chemistry (aromatic vs aliphatic) unpublished
  • LBA1 ratio basis (weight vs volume) and LBA1 itself not documented by Technocolor/dealer
  • whether LNB17 may replace LNB42/LNB20 in Technocolor's LBA42/LBA26 primers is unstated
  • shelf life unpublished
  • lightfastness rating unpublished
  • no LNB17-specific TDS/SDS found (data taken from the Milesi LBA45 TDS, rev. 2015-08)
  • conventional-spray 30–40 psi from distributor table: column (air vs product pressure) ambiguous