METHOD OF PRODUCING PLASTICISING ADDITIVE FOR CONCRETE AND ADDITIVE OBTAINED USING SAID METHOD Russian patent published in 2015 - IPC C04B24/02 C04B103/32 C04B111/20 

FIELD: chemistry.

SUBSTANCE: method includes static copolycondensation of sulphanilic acid with formaldehyde by mixing components while heating over a calculated period of time, followed by alkaline neutralisation of the end product, wherein static copolycondensation of sulphanilic acid with formaldehyde is carried out in conjunction with phenol and/or derivatives from the phenol series: alkylphenol, ethoxylated alkylphenol, ethoxylated phenol, with the following content of components, wt %: sulphanilic acid 10-20, phenol 10-20, derivatives from the phenol series 1-10, formaldehyde 5-15, water - the balance up to 100%, wherein the copolycondensation process is carried out at temperature of the mixture of 80-120°C, the calculated period of time is 20-720 minutes, and neutralisation of the copolycondensation product - water-soluble polymer - is carried out with 10-20% alkali solution and the product is cooled to 20-30°C. The superplasticiser obtained using the present method is a water-soluble polymer and contains, wt %: polymer 20-45, water - the balance up to 100%.

EFFECT: obtaining an additive having both hydrophilic and hydrophobic properties, longer mobility retention period.

2 cl, 3 tbl