Assertion: formaldehyde's effect | /r/HasProperty | neutralized with caustic soda solution
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Source sentences:
text: A method of obtaining a urea-formaldehyde resins by condensation formaldehydefree raw materials with urea by heating first at neutral or slightly alkaline environment, then in the acidic environment in the presence of catalytic additives consisting of formaldehyde, caustic soda and sulfuric acid when the molar ratio 1,0:(0,4-0,5):(0,1-0,3) accordingly, with the subsequent deposition of the resulting product with an additional amount of urea in a neutral or slightly alkaline environment in the initial and final molar ratio of urea to formaldehyde to 1.0:(1.9 to 2.1), and 1,0:(1,1-1,6), respectively, characterized in that as formaldehydefree raw materials used urea-formaldehyde concentrate, the effect of impurities in carbamidomethylation concentrate and urea is neutralized with caustic soda solution until the pH of the mixture of 6.0-8.0, and the stabilization of the pH of the reaction mixture reached by the use of catalytic additives in an amount of 0.1 to 3.0% by weight of a source of formaldehyde in urea-formaldehyde concentrate.