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Defects related mainly to poor adhesion

Chapter

Abstract

Brittleness in a film can arise in a number of ways. The following are probably the most common:
  1. (i)

    by the use of a medium of too short oil length (the effects are apparent very early);

     
  2. (ii)

    by oxidation and weathering of externally exposed films;

     
  3. (iii)

    by the use of reactive pigments such as zinc oxide — formation of zinc soaps is accompanied by embrittlement of the film;

     
  4. (iv)

    the use of insufficient or unsuitable plasticizer in non-convertible films such as cellulose nitrate or chlorinated rubber.

     

Keywords

Poor Adhesion Paint Film Urea Formaldehyde reSin Galvanize Iron Priming Coat 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Notes

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    Selden, G. and Prutton, C.F. (1940), Techn. Proc. Ann. Convention Fed of P. and V. Prod. Clubs,October 1940, p. 231, and ibid.,1941, p. 149, point out that oil and grease inhibit adhesion through absorption forces (residual valencies), because they are so strongly absorbed on to metal surfaces owing to their polar character that they prevent the polar groups of the coating material from making intimate contact with the base. On the example of the ‘greasy’ stearic acid these workers demonstrate that long straight hydrocarbon chains, because they are ‘slippery ones, without turns or twists’, cannot anchor themselves in the organic coating film.Google Scholar
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    Brittleness due to drying in infra-red plants, see Section 4.12.Google Scholar
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    Hess, M., (1944), Paint Tech., 9, No. 98, p. 29.Google Scholar
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    Staudinger, H. (1952), Z. f. Angew. Ch.,64, p. 152. How tenaciously parts of solvents can be occluded purely mechanically by macromolecules may be judged from the observation that cyclohexane or carbon tetrachloride held in such a manner by cellulose could not be removed in spite of applying high vacuum for several days and in addition temperatures at 80–100°C.Google Scholar
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    Sutton, H. (1943), J. of Sc. Instr., 20, 90.Google Scholar
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    Broockmann, K. (1954), Farbe Lack, 60, 445.Google Scholar
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    I.C.I. Pretreatment News No. 14, July 1958.Google Scholar

Copyright information

© M. Hess, H.R. Hamburg and W.M. Morgans 1979

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