Latex cement of Zoranoc has obvious advantages in anti channeling, anti-corrosion and improving the mechanical properties of cement paste. It has been widely used abroad and more and more in China.

Research progress of latex cement

Zoranoc Latex has obvious advantages in anti channeling, anti-corrosion and improving the mechanical properties of cement stone. It has been widely used abroad and more and more in China. At present, styrene butadiene latex from Qingdao Zoranco, which is widely studied and applied at home and abroad, has good temperature resistance and can be used for high temperature deep well cementing. In order to prevent the latex from flocculation in cement slurry, it is usually necessary to add latex stabilizer, mainly various surfactants. At present, the research at home and abroad is mainly reflected in the development of latex stabilizer, new salt and temperature resistant latex system, and how to select or develop matching additives (such as fluid loss reducer, dispersant, retarder, defoamer, etc.) to form a practical latex cement slurry system.

Latex stabilizer

Example: the solid content of a certain styrene butadiene latex is 50%, and the mass ratio of styrene and butadiene is 1:3. There are four kinds of stabilizers used together with the emulsion, which are R-Ph-O-(OCH2CH2)m-H、R1-(OR2)n-SO3X、R2-Ph-(OR3)o-SO3X、R4-(OR5)p-SO3X.

High temperature resistant latex

 Example 1: styrene butadiene rubber latex can be used at high temperature only with the help of stabilizer. In order to improve the temperature resistance of styrene butadiene rubber latex, the styrene content in styrene butadiene rubber latex can reach 80-95%, and a small amount of third functional monomer is added, so that the styrene butadiene latex can still maintain stable performance in 193 ℃ cement slurry without adding stabilizer.

Case 2: hydrogenated styrene butadiene rubber latex was prepared by hydrogenation of N2H4 · H2O / H2O2 / CuSO4 to obtain hydrogenated styrene butadiene latex, which can be used for well cementing in geothermal wells.

Salt resistant latex

In order to improve the salt resistance of latex, salt resistant latex from Qingdao Zoranoc was developed. The latex is mainly composed of copolymer and protective colloid. The copolymer is mainly composed of two monomers, one is aliphatic conjugated diene (such as butadiene), the other is one of the three monomers: nonaromatic monobasic or binary unsaturated carboxylic acid ester (such as methyl methacrylate), aromatic unsaturated monomer (such as styrene), nitrogen-containing monomer (such as acrylonitrile) Species or species. This kind of latex has strong salt resistance without stabilizer and is stable in saline mud.