新建的沼气池多数为水泥和砖结构,使用1—2年后便逐渐漏气。尤其是水压间、进料口与池体本身连接处,更是施工操作中的薄弱环节。因此,沼气池的防渗漏十分重要。有人采用水玻璃涂层,但性脆、易脱落、碱性强。也有采用乳化沥青涂层,但溶剂味重,要求沼气池烘干后才涂,施工困难。为克服上述问题,可采用我所研制并投产的高粘度乙烯——醋酸乙烯(简称EVA)乳液。指标如下:残留醋酸乙烯为0.3％,pH为4.5—6.0,粘度为3000厘泊,含固量和乙烯含量分别为52％和15— Most of the new biogas digesters are constructed of cement and brick and will gradually leak out after 1-2 years of use. In particular, between the water pressure, the feed inlet and the pool itself connected, is the construction of the weak links. Therefore, digesters anti-seepage is very important. Some people use water glass coating, but the sexual crisp, easy to fall off, alkaline strong. There are also emulsified asphalt coating, but the taste of solvent, biogas digester is required before drying, construction difficulties. To overcome the above problems, I developed and put into operation high viscosity ethylene - vinyl acetate (EVA) emulsion. The indicators are as follows: residual vinyl acetate 0.3%, pH 4.5-6.0, viscosity 3000 cps, solids content and ethylene content of 52% and 15-