DER 671-X75

							Product Information
							D.E.R.™ 671-X75 Epoxy Resin Solution
							D.E.R.™ 671-X75 Epoxy Resin Solution is a solid reaction product of epichlorohydrin and bisphenol A dissolved in xylene. D.E.R. 671-X75 Epoxy Resin Solution is a low molecular weight epoxy resin of the “1-type” in a xylene solution. Resin solutions such as this, when formulated with polyamine or polyamide hardeners, form an excellent base for many high quality coatings. These two-pack coating systems are suitable where cure must be achieved at ambient temperature, and where films must withstand exposure to corrosive atmospheres containing a variety of chemical reagents, solvents or salt water. The outstanding resistance properties, hardness, excellent adhesion to almost any substrate and flexibility are utilized in a wide variety of finishes, including marine and industrial maintenance coatings. D.E.R. 671-X75 Epoxy Resin Solution can also be used as complimentary resin in non-epoxy coating systems to improve corrosion resistance properties. This product is suitable for use in applications such as: •         Marine and Protective Coatings •        Automotive Coatings •         Can and Coil Coatings •         Civil Engineering
		Description
		Introduction
	Typical Applications
								Property1) Value Method Epoxide Equivalent Weight (g/eq) 430 – 480(2) ASTM D-1652 Epoxide Pecentage (%) 9.0 – 10.0(2) ASTM D-1652 Epoxide Group Content (mmol/kg) 2080 – 2330(2) ASTM D-1652 Color (Gardner) 2 Max. ASTM D-1544 Viscosity @ 25°C (mPa^s) 7500 – 11500 ASTM D-445 Density @ 25°C (g/ml) 1.09 ASTM D-4052 Non-volatile Content (wt%) 74 – 76 DowM 101188-TE Solvent Xylene Shelf Life (Months) 24 (1) Typical properties, not to be construed as specifications. (2) Based on solids.
	Typical Properties

 

Below is a general purpose clear coating formulation. This kind of formulation is recommended for use where excellent flexibility, water resistance, good chemical and solvent resistance are needed. Either the resin or the hardener (or both) may be pigmented for brushable or sprayable coatings. The polyamide hardener may be partially or completely replaced by the recommended amounts of other polyamide hardeners to achieve the desired coating properties.

 

Typical Formulation Part A:	Kilograms
D.E.R.™ 671-X75 Epoxy Resin Solution	406.22
Methyl Isobutyl Ketone	75.58
Total	481.80
Part B:
Ancamide 220-X70 (Air Products)	127.69
Xylene	121.90
DOWANOL™-PM Glycol Ether	88.07
Total	337.66
Total Composite Blend:	819.46

Typical Polyamide Cured Clear Coating Formulation (continued)

 

 

Typical Properties as Formulated	Value
Viscosity (cSt)	80 – 100
Density (kg/m3)	981
Solids (wt%)	48.09
Solids, volume (%)	42.44
VOC (g/l)	510
MEK Double Rubs	200 Pass
Front Impact (in*lb)	80
Reverse Impact (in*lb)	40

 

Formulating Procedure:

Blend the resin and/or curing agent solution thoroughly with the solvents, filter if desired, and package in matching quantities. Slowly and thoroughly blend the curing agent solution into the resin solution. For maximum results, age the blended components for 15 minutes to 1 hour. And apply in a well ventilated area. The blend has a limited pot-life, but should be usable up to 8 to 12 hours with very little viscosity change under normal working conditions.

Brushing Thinner		Spraying Thinner
Methyl Isobutyl Ketone (wt%)	33	Methyl Isobutyl Ketone (wt%)	45
Xylene (wt%)	33	Xylene (wt%)	50
DOWANOL-PM Glycol Ether (wt%)	34	DOWANOL-PM Glycol Ether (wt%)	3.25
		DOWANOL-DPM Glycol Ether (wt%)	1.75
Total (wt%)	100	Total (wt%)	100

 

If cured at room temperature, a 30-50 pm film will reach the following degree of cure:

Dry to Handle: 5-8 hours

Full Physical Properties: 3-4 Days

Full Resistance Properties: 6-8 Days.

This corresponds approximately to the following cure cycles at elevated temperatures; 25 minutes at 95°C 15 minutes at 120°C 10 minutes at 150°C 5 minutes at 175°C

 

	1 Hour	1 Day	1 Week
Mineral Spirits	1	1-2	2
Xylene	2S	4S	–
Nitroethane	2S	4S	–
Polyglycol, Ether	4S	–	–
Polyglycol, Ether Acetate	3S	4S	–
Methyl Ethyl Ketone	4	–	–
n-Butanol	2S	4	–

Solvent Resistance:

 

Water Resistance:

	Room Temperature 1/30 Days	Boiling Temperature 10/60 minutes
Ambient Cure (7 days)	1 / 1	2 / 4S
Bake Cure (30 min at 120°C)	1 / 1	2 / 4S

 

Below is a general purpose gloss enamel recommended for use on docks, boats and other marine fixtures requiring excellent water resistance. This formulation is suitable for brush and roller application and may also be thinned for spray application with the same solvent blends as shown for the clear coating system on the previous page.

Typical Formulation Part A:	Kilograms
D.E.R.™ 671-X75 Epoxy Resin Solution	318.07
Xylene	152.71
Methyl Isobutyl Ketone	94.73
Total	565.51
Part B:
Ancamide 220-X70 (Air Products)	133.29
Titanium Dioxide (e.g. Ti-Pure R900 ex. DuPont)	207.36
Calcium Carbonate	122.41
Pigment (e.g. iron-oxide Red)	27.20
Bentone 34 (NL Industries)	1.19
Cab-O-Sil TS-720 (Cabot Corporation)	1.19
BYK P 104-S (BYK Chemie)	0.60
Total	493.24
Composite Blend Total	1058.75