Polyurethane performance coatings

Take the best from Oxazolidine for your PU performance coating formulations

Incozol versatile PU coating additives offer both 1K and 2K solvent borne and high solids polyurethane coatings formulators a new way to formulate while achieving excellent performance.

Incozol grades provide additional benefits, easily select the most appropriate Incozol grade according to the benefits you want to achieve:

	Moisture scavenger	Use with low NCO prepolymers	Lowering viscosity	Reducing VOC	Low temp storage & handling	Stability in 1K aliphatic systems	Stability in 1K aromatic systems	Use in 2K systems
Incozol 2	R		S					R
Incozol LV	S		R	R	R	R	R	R
Incozol EH	S	R			R	R	R
Incozol 4	S	R				R	R

R ─> Recommended
S ─> Suitable

Moisture scavenger for Polyurethane Coating

The moisture may originate in the atmosphere or be present in the raw materials, such as the pigments, extenders, solvents, etc. Preventing this reaction from occurring prevents pinhole defects from appearing in the coating surface which will affect the coating integrity and ultimately lead to corrosion of the substrate.

As a moisture scavenger, Incozol 2 eliminates the generation of carbon dioxide gas by preferentially reacting with moisture over isocyanate.

Below pictures are discs with an aliphatic PU prepolymer with and without oxazolidine in the formulation.
On application, the reaction with moisture produces visible pinhole defects (below left) in comparison to the formulation incorporating oxazolidine (below right).

Aliphatic prepolymer
WITHOUT oxazolidine
Aliphatic prepolymer WITHOUT oxazolidine

Aliphatic prepolymer
WITH oxazolidine
Aliphatic prepolymer WITH oxazolidine

As demonstrated in the 2 pictures above aliphatic prepolymer with oxazolidine shows defect free film (no bubbling/ gassing).

By acting as a very effective moisture scavenger in the coating system, Incozol 2 will:

Prevent the consequences of corrosion and weathering by eliminating pinhole defects in the dried film
Maintain film performance during application and in its final cured state

Stability in 1K aliphatic polyurethane systems

In 1K aliphatic coating systems Incozol EH is very effective in bringing enhanced performances such as:

Storage stability in 1K PU balcony and flooring coating systems
Low temperature storage stability - no crystallization effect

Storage stability in 1K PU balcony system

In below graph both oxazolidine latent hardeners, Incozol 4 and Incozol EH were combined with an aliphatic polyether prepolymer without Incozol (control) at 1:1 stoichiometry based on % NCO of the prepolymer (approximately 8.5% w/w).

Stability in 1K aliphatic polyurethane systems

Both oxazolidines show good in-can stability

Storage stability in 1K PU flooring system

The change in viscosity was measured for unopened containers of PU prepolymer without Incozol (control), then with the addition of Incozol 4 and Incozol EH at a 1:1 stoichiometry based on the total % NCO of the flooring system.

Oxazolidines demonstrate excellent storage stability even after
storage at 40°C for 56 days.

Product	Seeded (Y/N)	Storage Temp. (°C)	1 week	2 week	1 month	2 months	4 months	6 months
Incozol 4	N	-15	CRY	CRY	CRY	CRY	CRY	CRY
	Y	-15	CRY	CRY	CRY	CRY	CRY	CRY
	N	20	PC	PC	CRY	CRY	CRY	CRY
	Y	20	PC	PC	CRY	CRY	CRY	CRY
Incozol EH	N	-15	NC	NC	NC	NC	NC	NC
	Y	-15	NC	NC	NC	NC	NC	NC
	N	20	NC	NC	NC	NC	NC	NC
	Y	20	NC	NC	NC	NC	NC	NC

NC: Not crystallised, PC: Partly crystallised, CRY: Crystallised (solid)

As can be seen in this table, Incozol EH shows excellent storage stability, with no signs of crystallisation even when seeded with a potential nucleation site (to mimic dirt contamination). This is in contrast to isobutyraldehyde based oxazolidines (e.g. Incozol 4), which provide limited storage stability at these temperatures.

Downloadable documents
	Moisture scavenger for 2K polyaspartic ester floor PU coatings Case Study In common with all 2K PU coatings, the presence of moisture affects the reactivity and application properties of the coating. Polyaspartic coatings are no exception and the flow and levelling properties of the coating, in particular, can be adversely affected. Incozol 2 acts as an effective moisture scavenger in polyurethane coatings systems. It removes residual moisture from the formulation and prevents bubbling and down glossing caused by high moisture levels either on the substrate or from the atmosphere.
	Moisture scavenger for polyaspartic ester coatings Case Study In common with all 2K PU coatings, the presence of moisture affects the reactivity and application properties of the coating. Polyaspartic coatings are no exception and the flow and levelling properties of the coating, in particular, can be adversely affected. Incozol 2 acts as an effective moisture scavenger in polyurethane coatings systems. It removes residual moisture from the formulation and prevents bubbling and down glossing caused by high moisture levels either on the substrate or from the atmosphere.
	Latent hardener for 1K aliphatic waterproofing PU coatings Case Study Do you face challenges when formulating polyurethane waterproofing coatings for exterior applications? Carbon dioxide generation can affect the film integrity and cause structural weakness. In addition, due to bubble formation, the final coating might lack the desired aesthetic requirements (downglossing). Incozol EH latent hardener is used in a wide variety of 1K aliphatic moisture triggered polyurethane coatings. The technology lends itself to high build exterior waterproofing applications such as roof, floor and balcony coatings.
	Oxazolidine latent hardeners for 1K PU flooring & balcony systems Case Study Today’s polyurethane formulators face a number of hurdles when trying to achieve the desired film properties and appearance for their systems. Whether the target is a high gloss finish for a VOC-compliant coating, a fast curing adhesive or a strong, flexible defect-free sealant, the issues facing PU formulators when attempting to develop new technologies
	1K waterproofing balcony coatings Case Study The addition of Incozol 4 promotes fast through-cure but without any CO2 gas evolution. It also allows the formulator to reduce the isocyanate level which could lead to a reduction in toxicity of the finished product.