PROCESS FOR PREPARING MASKING AND PROTECTIVE AGENTS FOR METALS TO BE SUBJECTED TO CHEMICAL WORKING

• Main Authors: PARSU DUMITRU, PARSU LENU A, NOVAC OVIDIU ADRIAN, IANCU LORENA, SPURCACIU BOGDAN NOROCEL, GHIOCA PAUL NICULAE
• Format: Patent
• Language: English; Romanian
• Published: 30.05.2011
• Subjects: CHEMISTRY; FERTILISERS; FERTILISERS PRODUCING CARBON DIOXIDE; INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; MANUFACTURE THEREOF; METALLURGY

The invention relates to a process for preparing agents for masking and protecting metals subjected to chemical processing. According to the invention, the process consists in dissolving, in 8.5...8.6% tetra-chloro-ethylene, a mixture of 100 parts of styrene-butadiene star diblock-copolymer with a content of 30.3% polystyrene having a molecular mass of 180000 g/mole and 50...60 parts, preferably 55 parts, of styrene-butadiene diblock-copolymer with a content of 70% polystyrene having a molecular mass of 80000 g/mole or 45...55 parts, preferably 50 parts, of styrene-butadiene diblock-copolymer with a content of 70% polystyrene having a molecular mass of 100000 g/mole. Invenţia se referă la un procedeu pentru obţinerea unor agenţi de mascare şi protecţie a metalelor supuse uzinajului chimic. Procedeul conform invenţiei constă din dizolvarea în tetracloretilenă la o concentraţie de 8,5...8,6% a unui amestec format din 100 părţi dibloc-copolimer stiren-butadienic stelat cu un conţinut de 30,3% polistiren, având masa moleculară de 180.000 g/mol şi 50...60 părţi, preferabil 55 părţi dibloc-copolimer stiren-butadienic cu un conţinut de 70% polistiren, având masa moleculară de 80.000 g/mol sau 45...55 părţi, preferabil 50 părţi dibloc-copolimer stiren butadienic cu un conţinut de 70% polistiren, având masa moleculară de 100.000 g/mol.