Polyurethane systems for coil coating - the best combination of hardness and flexibility

Polyurethane systems are characterized by an excellent balance between hardness and flexibility, outstanding resistance to chemicals and good weather stability. They are preferred in applications requiring extremely good post-formability (suitability for deep drawing) and resistance properties.

Bayer MaterialScience offers a comprehensive range of binders and crosslinkers for one-component polyurethane stoving systems as well as corresponding starting formulations for primers, top coats and backing coats.

The coating systems can be finetuned by selecting specific raw material components. This "building block" principle allows the formulation of coil coatings with a very broad range of properties.

What is coil coating?

Advantages and applications of polyurethane systems

Composition of one-component polyurethane stoving systems

Bayer MaterialScience offers a comprehensive range of raw materials for 1K-PUR stoving systems as well as corresponding starting formulations for primers, topcoats and backing coats:

Raw material category	Description
Desmodur® BL	Blocked polyisocyanates, solventborne
Bayhydur® BL	Blocked polyisocyanates, waterborne
Desmophen® T, Desmophen® C	Hydroxyfunctional polyesters, solventborne
Bayhydrol® E	Hydroxyfunctional polyesters, waterborne
Desmotherm®	Self-crosslinking one-component polyurethane stoving systems, solventborne
Bayhytherm®	Self-crosslinking one-component polyurethane stoving systems, waterborne

Raw materials for solventbased systems

	Formulation	Desmodur®	Desmophen®
Primer
Standard	BBB 4313	BL 3175 SN	T 1665 SN/IB
High film thickness	BBB 2024/1	VP LS 2078/2	T 1775 SN
Top coat
Standard	BBB 5430	BL 3175 SN	T 1665 SN/IB
Improved stain resistance	GQUI 0109	BL 3575/1 MPA/SN	T 1665 SN/IB
High reactivity	BBB 4381	BL 3475 BA/SN	T 1665 SN/IB
High film thickness	BBB 2021/1	VP LS 2078/2	T 1775 SN
With textural effect	GQUI 0106	BL 4265 SN	T 1775 SN
With high solids content	GQUI 0108	BL 4265 SN	T 1775 SN, C 1200
Weather resistance	GQUI 0401-2	PL 340 60% BA/SN PL 350 75% MPA/SN	T 1665 SN/IB T 1775 SN
With metallic effect	BBB 4365	BL 3175 SN	T 1665 SN/IB
Clear coat
High reactivity	BBB 5433	BL 3370 MPA	T 1665 SN/IB
High film thickness	BBB 4372	VP LS 2078/2	T 1775 SN
Backing coat
With good adhesion to metal and to polyurethane foam	BBB 5434	BL 3175 SN	T 1665 SN/IB

Raw materials for waterbased systems

	Rezeptur	Bayhydur®	Bayhydrol®
Primer
Standard	GQUI 0110/1	BL 2781 XP	E 356
Topcoat		Bayhydur®	Bayhytherm®
Standard	GQUI 0333/1	BL 2810 XP	3146