Development on general concentrate of hydraulic support in mine

In view of the complicated and changeable water quality of the mine solution in our country, in order to realize the adaptability of the water quality of the stent concentrated solution products and solve the problem of selecting high hardness and high anion content water quality products, a general formula system of the hydraulic stent concentrated solution is designed in this paper. The key to the research is the synthesis of additives with high efficiency lubricity and hard water resistance. In this paper, vegetable oil-based carboxylic acid is selected and a new hard water resistant functional group is introduced into its molecule by chemical reaction. The technological conditions such as material ratio, reaction temperature and reaction time are studied to synthesize a multifunctional additive for lubrication and hard water resistance. The performance evaluation shows that the additive can adapt to hard water of 2 000 mg/L, has 1% mass concentration lubricity of 597.8 N, has no rust in the corrosion test, has good lubricating and antirust properties, and is an excellent multifunctional additive. On this basis, a universal concentrated solution product was designed, and its performance was investigated, and compared with the representative high-grade concentrated solution in the industry. The experimental results show that all indexes of the developed universal concentrated solution product meet the technical requirements of the coal industry standard MT76-2011, and adapt to the water conductivity of the mine in excess of 3 500 μS/cm. The stability, rust resistance and lubricity of the three main performances of the bracket transmission medium are all better than those of the representative products in the industry.