34results about How to "Avoid premature decomposition" patented technology

The present invention relates to an improved melting grafting method of polypropylene and polyether acrylate, which comprises the following process steps: a) adding polyether acrylate monomers, peroxidation initiators and antioxidants into a high-speed disperser at normal temperature Mix uniformly in the middle to form a mixed solution of grafted monomer and initiator; b) the twin-screw extruder is heated up to the reaction temperature, and the polypropylene resin is passed through the feeder of the twin-screw extruder, with a fixed feeding frequency Add from the feed port; c) at the feed port of the twin-screw extruder mixing section, continuously add the mixed solution of the graft monomer and the initiator by the liquid pump to make the peroxidation initiator, polyether acrylate monomer and react with polypropylene melt in the mixing section of the twin-screw extruder; d) Turn on the vacuum pump at the end of the screw to remove low-molecular matter, and the extruded melt is cooled and pelletized to obtain the final polypropylene / Acrylic polyether ester grafted product. The invention avoids the problem of material slipping at the feeding port of the twin-screw extruder, is beneficial to the grafting reaction, and improves the grafting efficiency.

The invention discloses an environment-responsive cementing filter cake removal liquid, which comprises the following components in parts by weight: 5-20 parts of environment-responsive scavenger A, 0.2-5 parts of environment-responsive scavenger B. 0.5-3 parts of surfactant 1. 0.3-2.5 parts of suspending agent, 0.5-3 parts of stabilizer and 100 parts of water with a pH of 8-10. The scavenger component of the present invention can only start to react under certain temperature and pH conditions downhole, and through the synergistic activation of the environment-responsive scavenger B-formation heat on the environmental-responsive scavenger A, the decomposition of the polymer treatment agent is improved Efficiency and speed, to achieve rapid decomposition in a short period of time, the solid phase particles are easy to be removed after the filter cake is destroyed, and avoid the early decomposition of the scavenger caused by liquid preparation, transportation and other links, and adapt to the characteristics and requirements of cementing operations.

The invention discloses a manufacturing method of mirror oriented silicon steel. The manufacturing method of the mirror oriented silicon steel comprises the steps that molten iron is smelted, one or more elements of Sb, Sn, P, Cu and Bi are added in the smelting process, and after the molten steel is refined and poured, a plate blank is obtained; after the plate blank is heated to 1320 DEG C-1400DEG C, the plate blank is hot-rolled, and a hot-rolled plate is prepared; the hot-rolled plate is normalized; the hot-rolled plate after being normalized is cold-rolled, and a cold-rolled plate is obtained; the cold-rolled plate is decarburized and annealed, during decarburizing and annealing, the carbon content in the cold-rolled plate is reduced to below 30ppm, meanwhile, a SiO2 oxide layer is formed on the surface of the cold-rolled plate, the oxygen adhering amount of the cold-rolled plate is controlled to be less than 500ppm, and the reduction time is controlled to be greater than 100 seconds; the decarburized and annealed cold-rolled plate is dried and annealed with magnesium oxide as an isolating agent; and the dried and annealed cold-rolled plate is heated to 1170-1250 DEG C at a preset heating rate for high temperature annealing.