Document M4Ep1218QJXRDyewme1zM4z2z

010S3 RH&ERfitfOBSi Speed Easy Emulsion Faints Protein Free - Emulsion Paintsf 1fir, j, B# Bullitt, Lab,* c . . . Mr. 3. w. tutti-Ub, Mr. Stuart Graves, Lab* Mr 16*88 TM*x**m,VMf.n*..*3QS RFTHRa TR MMfflLL L&BMIUW! LIMlif Philadelphia Laboratory July 20, 1948 ETMLElffi/CARBOI MONOXIDE P0LYAMI1ES AS BINDER -.........-.......... ............................... Samples of flat wall emulsion type paints using the subject material as a binder have been submitted to the laboratory for evaluation by the Experimental station. SUMMARY: The three samples as submitted are of no immediate in terest due primarily to their extremely low solids content at brushing viscosity (20-25$ by weight vs, 40-45$ by weight for current Speed Easy), This low solids content adversely affects hiding, spreading and brushing, Wet erosion resistance is satis factory for 2 of the 3 samples submitted. Th set up time for all samples is satisfactory, but after an overnight dry the films are somewhat softer than Speed Easy, One sample is odor free. Th other 2 have an objeotionaM odor somewhat similar to sour fruit, DESCRXPTI01: Brushing: The samples are packaged as soft past. When reduced 50*^8t^oy volume with water the material is quit thixo tropic resulting in sloppy brushing. The sample coded 181-A is gummy under the brush and wets poorly. The samples coded as 175-B and !75"C wet and spread easily, but have practically no hiding. All samples are slopp#, (Hotel The covering letter which accom panied the samples does not Indicate any composition differences between the 181-A and th 175-B sample. Both contain 14.3$ poly- amine. The 175-C sample contains 10.7$ polyamln. Other compo sition variables are listed in the table below), By comparison with the polyaaine samples Speed Easy wets and spreads good, is not sloppy and has uniform, solid hiding. Odors Previous samples of similar paints had a marked acetic asi3~oSor. In the present samples no acetic acid odor is present, but the 175-B and 175-0 samples have a marked soxs?fruit odor. Sample 181-A is essentially ddor free. Speed Easy is not entirely odor free, but it is considered less objectionable than the 175-B and 0 samples. N 30787 -2- i As mentioned above, all of th polyamin paints have poop hiding# probably due to their very low solids content t brushing viscosity, Colors After on month's exposure in the light, no notice* able discoToraiTon has developed, although the blue tint of the paint may be mashing any discoloration present, This exposure will be Con* tinned as Exposure Series #9912. Previous samples showed a tendency to discolor in the light, Wet, erosion resistance; The reduced material was applied over sand Blasted''grais^jSnelsTTM'After five days air dry the paints were tested for wet erosion resistance in th Gardner M-205 wasliaMlIty machine. The number of strokes required to produce a film fail ure for paints included in the valuation are listed below: Sample Strokes before failure 7077-181-A 7077-175-B 7077-175-0 Wesoo Speed Easy Standard Speed Easy Improved Speed Easy 1600+ 1315 8 10 120 800 The samples containing 14,3$ polyamine have satisfactory water resistance. The sample containing 10.7#polyamin is about equal to current Wesco production of Speed Easy in water resistance. We consider this degree of performance to be unsatisfactory (100 strokes after 5 days is considered standard performance). Dry: The initial set-up time of th polyamin paints Is satisfactory, but overnight dry Is tmsatisfactory because the films are somewhat softer than the Speed Easy film. stability: The polyamine paints appear to be relatively coarse dispersions, but are stable under the brush. Five cycles of. the freeze-thaw test do not adversely affect stability. This performance Is considered satisfactory for emulsion paint. COMPOSITION: For reference purposes the indicated composition of th samples is listed below: Sample 7077-181-A 7077-175-B 7077-175-0 Solids 35# " " Piffltt&nt 80$ T.102 2011 Asbestine nn Mzgsfet** 14.3# 14.3# 10.7# Colloid 1.4# MO (4000 ops n ti 11 tl it B Based on pigment. DUP030003078 ~3 Gmgwmm} The present samples show a general improvement over samples submitted la December 19^7. Further improvements should result from higher solids content and reduce thixotropic character istics, Both of these improvements would probably result if a low er viscosity grade of methooellulose were used. The details of this valuation are recorded in notebook 3*578, pages 1^, 15/ 32, and 33. PHILADELPHIA LABORATORY CWSsbj DUP030003079