| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to field of construction materials, in particular to complex additives, used in production of mortars, in masonry and plaster works. Complex additive to mortars, consisting of lignosulphonate-based plasticiser and air-entraining additive, in accordance with invention, as air-entraining additive, it contains composition of surface-active substances (SAS), which includes low-hydrophilic surface-active substances with value of hydrophilic-lipophilic balance (HLB) 1?3 and highly-hydrophilic surface-active substances with HLB value 30?40 with the following ratio, wt %: lignosulphonates - 80-95; composition of surface-active substances - 5-20. SAS composition includes low-hydrophilic substances with HLB value 1?3 and highly-hydrophilic substances with HLB value 30?40 with the following ratio of components, wt.p.: low-hydrophilic SAS with HLB value 1?3 - 5-20, highly-hydrophilic SAS with HLB value 30?40 - 80-95. Complex additive can additionally include hydrophilic stabiliser from the group of vegetable, artificial or microbiological polysaccharides in amount 1-10% of the total weight of lignosulphonate and composition of surface-active substances.EFFECT: increased degree of air-entraining, increase of time for which mortar preserves its mobility.2 cl, 4 ex, 2 tbl |
