摘要:
A multi-functional aqueous protective treatment for wood substrates. The treatment comprises an aqueous solution of a zirconyl compound and incorporated bio-active constituents, providing protection against bio-degradation of wood and against degradation of aesthetic value of applied wood coatings by spontaneous staining and also protects against termites or other “in-depth” bio-degradation factors.
摘要:
A pigment grade corrosion inhibitor and a method of forming the inhibitor is disclosed. The inhibitor is comprised of a host species comprised of an inorganic compound having a layered structure and a guest species comprised an anionic species of a weak acid. The host species is preferably a double hydroxide having a structure of: [M(II)1-xM(III)x(OH−)2] [An−x/n.y H2O], where M(II) is a divalent metal cationic species, M(III) is a trivalent metal cationic species, and An− is an anionic species, preferably with the species present in a range of: 0.2≦M(III)/(M(II)+M(III))≦0.4. The guest species include: ortho-phosphoric, pyrophosphoric, tripoly-phosphoric, polyphosphoric acid; mono- and di-alkyl or aryl-esters of ortho-phosphoric and pyrophosphoric acid; metaphosphoric, trimeta-phosphoric, poly-metaphosphoric acid; phosphorous (phosphonic) acid; derivatives of phosphonic acid; alkyl and aryl esters of thio-phosphoric and dithio-phosphoric acid; molybdic, phospho-molybdic, silico-molybdic acid; boric acid; cyanamidic acid; nitrous acid; derivatives of thio- and dithiocarbonic acid, including o-alkyl esters; derivatives of dithiocarbamic acid, including N-alkyl dithiocarbamates; pyrrolidinecarbodithioic acid; thio-organic compounds functionalized with at least one —SH group of acidic character, including: 2,5-dimercapto-1,3,4-thiadiazole (DMTD), 2,4-dimercapto-s-triazolo-[4,3-b]-1,3-4 thiadiazole, trithiocyanuric acid (TMT), and dithiocyanuric acid, various N—,S— and N,N—, S,S— and N,S-substituted derivatives of the above DMTD and TMT compounds; various S-substituted derivatives of trithiocyanuric acid; dimer and polymer derivatives of the above DMTD and TMT compounds, including 5,5′ dithio-bis (1,3,4 thiadiazole-2(3H)-thione or (DMTD)2, and (DMTD)n, polymers of DMTD and (TMT)2, dimers and polymers of TMT; various combinations of all the above; soluble salts of DMTD and TMT; poly-ammonium salt of DMTD or (DMTD)n and TMT formed with polyamines; mercapto-benzothiazole, mercapto-benzoxazole, mercapto-benzimidazole, and combinations, thereof; di- and poly-mercapto compounds, including: di-mercapto derivatives of thiophene, pyrrole, furane, diazoles, and thiadiazoles; di- and tri-mercapto derivatives of pyridine, diazines, triazines, benzimidazole, and benzothiazole, including dimercaptopyridine, 2, 4-dithiohydantoine, and 2,4,-dimercapto-6-amino-5-triazine; and carboxylic and di-carboxylic acids, including ascorbic, salicylic acid, phthalic acid, nitro-phthalic acid, succinic acid, and derivatives of succinic acid, including 1-(benzothiazol-2-ylthio)succinic acid.
摘要:
A pigment grade corrosion inhibitor and a method of applying the inhibitor is disclosed. The inhibitor is comprised of a host species comprised of an inorganic compound having a layered structure and a guest species comprised an anionic species of a weak acid. The host species is preferably a double hydroxide having a structure of: [M(II)1−x M(III)x (OH−)2] [An−x/n.y H2O], where M(II) is a divalent metal cationic species, M(III) is a trivalent metal cationic species, and An− is an anionic species, preferably with the species present in a range of: 0.2≦M(III)/(M(II)+M(III))≦0.4. The guest species include: various phosphoric acids and derivatives thereof; boric acid; cyanamidic acid; nitrous acid; derivatives of thio- and dithiocarbonic acid; thio-organic compounds functionalized with at least one —SH group of acidic character, including: 2,5-dimercapto-1,3,4-thiadiazole (DMTD), 2,4-dimercapto-s-triazolo-[4,3-b]-1,3-4 thiadiazole, trithiocyanuric acid (TMT), and dithiocyanuric acid.
摘要:
A corrosion-inhibiting composition for application to a metal substrate, such as aluminum or steel, and in connection with a paint, and the synthesis of the composition. The active inhibitor constituent of the composition can be selected from the group consisting of 2,5-dimercapto-1,3,4 thiadiazole (DMTD), 2,4-dimercapto-s-triazolo-[4,3-b]-1,3-4-thiadiazole, trithiocyanuric acid (TMT), and derivatives of DMTD and TMT, including various N— or S— and N, N—, S— and N—,S-substituted derivatives of DMTD, including salts of DMTD of the general formula: M(DMTD)n, where n=1,2 or 3, and M is a metal cation and preferably M=Zn(II), Bi(III), Co(II), Ni(II), Cd(II), Pb(II), Ag(I), Sb(III), Cu(II), Li(I), Ca(II), Sr(II), Mg(II), La(III), Ce(III), Pr(III), Al(III) or Zr(IV). DMTD, TMT, and their derivatives may also be combined with phosphates, molybdates, borates, silicates, tungstates, phosphotungstates, phosphomolybdates, cyanamides, carbonates, SiO2 and mixtures thereof.
摘要:
A process of treating wood to reduce the tannin staining of coatings subsequently applied includes the steps of providing a solution of a zirconyl compound in a carrier liquid such as water, applying the solution to a wood surface, and, drying the solution. The pore structure of the wood is modified or sealed so that staining of coating compositions applied subsequently over the surface is reduced. The process is particularly beneficial in cases where the coating composition a clear or a light-colored latex paint, especially white. The preferred zirconyl compound is zirconyl acetate. The treating solution may be modified by addition thereto of a lanthanide compound, especially cerium, to provide UV light protection to a substrate and further by one or more metal cations to impart mildewicidal activity to the composition.
摘要:
A process of inhibiting of the staining of a film forming finish applied to a tannin containing wood substrate includes the step of applying to the wood substrate prior to or concurrently with the film forming finish, a protective coating containing an effective amount of zinc cyanamide to inhibit the migration of tannins from the substrate into the finish.
摘要:
Improved corrosion preventive pigment grade zinc cyanamide suitable for protective coatings is prepared by providing a hydrated slurry of finely divided, dispersed basic zinc carbonate, mixing with said slurry a stabilized soluble aqueous solution of hydrogen cyanamide to form zinc cyanamide having a crystalline structure characterized by the presence of an intense IR absorption spectral band at 2200 cm.sup.-1 and the substantial absence of component bands at 2050 cm.sup.-1 and 700 cm.sup.-1.
摘要:
A pigment grade corrosion inhibitor and a method of applying the inhibitor is disclosed. The inhibitor is comprised of a host species comprised of an inorganic compound having a layered structure and a guest species comprised an anionic species of a weak acid. The host species is preferably a double hydroxide having a structure of: [M(II)1-x M(III)x (OH−)2] [An−x/n·y H2O], where M(II) is a divalent metal cationic species, M(III) is a trivalent metal cationic species, and An− is an anionic species, preferably with the species present in a range of: 0.2≦M(III)/(M(II)+M(III))≦0.4. The guest species include: various phosphoric acids and derivatives thereof; boric acid; cyanamidic acid; nitrous acid; derivatives of thio- and dithiocarbonic acid; thio-organic compounds functionalized with at least one —SH group of acidic character, including: 2,5-dimercapto-1,3,4-thiadiazole (DMTD), 2,4-dimercapto-s-triazolo-[4,3-b]-1,3-4 thiadiazole, trithiocyanuric acid (TMT), and dithiocyanuric acid.
摘要:
A process for producing a strontium chromate corrosion inhibitor includes the steps of providing an aqueous slurry containing dispersed particulate strontium chromate, adding to the slurry a phosphoric acid or a neutral or acidic soluble salt of a phosphoric acid selected from the group consisting of ortho-phosphoric, pyro-phosphoric, tri-phosphoric, polyphosphoric, metaphosphoric, polymetaphosphoric, cyclic tri-metaphosphoric acid, and phosphorous acid, and, filtering and drying the resultant material whereby particulate strontium chromate of reduced solubility is produced.