3results about How to "Increase plastic viscosity" patented technology

The invention discloses high-compactness low-resilience shotcrete and a preparation method thereof, and relates to the field of shotcrete, the preparation method comprises the following steps: (1) respectively stacking a cementing material, a fine aggregate and a coarse aggregate by adopting an MAA model to obtain a design ratio of each internal raw material; and (2) fully mixing the cementing material, the fine aggregate, the coarse aggregate and the elasticity reducing agent which are obtained according to the design ratio in the step (1), adding water and a water reducing agent for mixing, and doping an accelerator in a manner of mixing with pressurized air to obtain the high-compactness low-resilience sprayed concrete. The early-strength elasticity reducing agent is adopted, pumpability of the sprayed concrete is improved, early hydration of the concrete is accelerated, under the combined action of the early-strength elasticity reducing agent and the alkali-free accelerator, the early mechanical property of the sprayed concrete is rapidly improved, and the construction efficiency of the sprayed concrete is improved. And by adopting multi-section close packing, close filling structures are respectively formed in the cementing material, the fine aggregate and the coarse aggregate, so that the plastic viscosity of the slurry and the compactness of the concrete are effectively improved.

The invention provides a TPE blood bag membrane material and a preparation method thereof, and solves the technical problems that an existing PVC blood bag membrane material is not environmentally friendly, not resistant to radiation and sterilization, poor in air permeability and the like. The TPE blood bag membrane material is prepared from the following raw materials in percentage by mass: 20 to 50 percent of SEBS, 5 to 20 percent of plasticizer, 30 to 60 percent of POE and 5 to 20 percent of EVA, the preparation method of the TPE blood bag membrane material comprises the following steps: S1, weighing the raw material components in percentage by weight; s2, fully and uniformly mixing the raw material components weighed in the step S1 to obtain a mixture; s3, carrying out melt extrusion and granulation on the mixture weighed in the step S2 through a twin-screw extruder; the method can be widely applied to the technical fields of polymer materials and medical application.

The application discloses a kind of high density low rebound shotcrete and preparation method thereof, it is related to shotcrete field, and preparation method includes: (1), respectively to cementitious material, fine aggregate, coarse aggregate is using MAA model to be packed and the design ratio of each raw material in interior is obtained;(2), cementitious material, fine aggregate, coarse aggregate and the rebounding agent of design ratio obtained according to step (1) are fully mixed, water, water reducing agent is mixed, then by the way of mixing with pressurized air, incorporate accelerator, obtain high density low rebound shotcrete.The application uses early strength rebounding agent, improves the pumpability of shotcrete, accelerates the early hydration of concrete, under the joint action of alkali-free accelerator, rapidly improves the early mechanical properties of shotcrete, improves shotcrete construction efficiency.Multiple close packing is used, and cementitious material, fine aggregate, coarse aggregate respectively form close packing structure, effectively improve the plastic viscosity of paste and the compactness of concrete.