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

 

 

 

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