4results about How to "Block growth" patented technology

The invention discloses a low-free-formaldehyde sodium glutamate-based gypsum retarder as well as a preparation method and application thereof, and belongs to the technical field of building material admixtures. The preparation method comprises the following steps: by taking sodium glutamate and formaldehyde as raw materials, carrying out an addition reaction at low temperature under a weakly alkaline condition regulated by calcium hydroxide to generate an intermediate; and then heating under an acidic condition to carry out dehydration polycondensation, and neutralizing by negative pressure and lime milk to prepare the sodium glutamate-formaldehyde condensation compound. The invention also discloses a retarder composition containing the condensate and a phosphate / zinc sulfate mixture. According to the invention, the content of free formaldehyde (1t; 300 mg / kg) is obviously reduced through improvement; the problem that the strength of gypsum is reduced due to a traditional retarder is solved by using the chelation of calcium ions and zinc sulfate.

The application discloses a concentrated liquid for hydraulic support based on coal-based Fischer-Tropsch synthesis technology and a preparation method thereof, and particularly relates to the technical field of hydraulic support concentrated liquid, and comprises the following components: coal-based Fischer-Tropsch synthesis oil derivative lubricant 30-45%, gasification cinder modification additive 5-12%, composite antirust agent 8-15%, non-ionic emulsifier 10-18%, freeze-thaw stabilizer 3-8%, and water in excess. The concentrated liquid takes the Fischer-Tropsch synthesis oil derivative as a core lubricating component, and is combined with the gasification cinder modification additive and the like, so that the problem of soap precipitation caused by high-hardness mine water is effectively solved, the concentrated liquid has good freeze-thaw resistance and environmental protection, meets the current environmental protection standard, and is particularly suitable for the high-mineralization mine area environment in Shanxi.

The application discloses a coating material for optical fiber and a preparation method thereof, an optical fiber insulator and a preparation method thereof. The preparation raw material of the coating material comprises the following components in parts by weight: tetrahydrofuran acrylate 40-60 parts by weight, carboxyl modified polyurethane acrylate oligomer 30-50 parts by weight, silicone modified epoxy acrylate bifunctional linker 5-15 parts by weight, vinyl silane surface modified SiO2 nanoparticles 2-5 parts by weight, triaryl sulfonium hexafluoroantimonate cationic initiator 0.1-1 part by weight, and TPO free radical photoinitiator 0.5-4 parts by weight. According to the embodiment of the application, the silicone modified epoxy acrylate bifunctional linker in the coating layer realizes active chemical bonding between the optical fiber coating layer and the alicyclic epoxy resin sheath, reduces the physical gap and thermal stress mismatch of the multi-material interface, and thus can fundamentally improve the interface strength, internal insulation performance and long-term reliability of the optical fiber insulator.