| 摘要 |
FIELD: polymer materials. ^ SUBSTANCE: invention relates to the area of preparing urea-formaldehyde resin-based thermosetting binders used in woodworking industry for manufacturing wood particle boards, plywood, wooden fiberboards, and the like, and which may be used in production of foamed materials. Polymer binder comprises 100 wt parts of urea-formaldehyde resin mixture and 1-5 wt parts of curing agent, said urea-formaldehyde resin mixture containing (i) urea-formaldehyde resin with 10-40% uronic cycles and weight portion of dry residue 55.0-65.0% and (ii) urea-formaldehyde resin with weight portion of dry residue 60.0-80.0% at (i)/(ii) ratio (5-95):(95-5). Urea-formaldehyde resin contain essentially no methanol. ^ EFFECT: reduced toxicity and increased waterproofness of products based on binder according to invention. ^ 4 tbl, 6 ex |
