| 摘要 |
FIELD: polymer materials. SUBSTANCE: invention relates to producing foams applicable as heat insulation materials in building industry, for improving soil structure, producing complex fertilizers in agriculture, and for arranging flowers. Urea-formaldehyde resin with urea to formaldehyde molar ratio 1:(1.5-1.65) is preliminarily supplemented with the same wherein mentioned ratio is 1: (1.15-1.20) at weight proportion of the two resins 1: (0.5-4), respectively. Mixture is dispersed and combined with solution of blowing and hardening agent. Foam for arranging flowers is prepared with weight proportion of resins 1: (3-4) and adding to blowing and hardening agent solution an acid-resistant dye in amount 0.3-0.7 g per 100 ml of solution, whereas foam is additionally treated for 10-30 min at 50-60 C with aqueous solution containing 25-50 g/l of nitric or oxalic acid salt and 25-50 g/l of glycol or water-soluble polyglycol. EFFECT: reduced toxicity of foam with retained quality characteristics. |
