the hair of contemporary youth is very valuable the post-90s who are punking out for health the obsession with hair care and anti-hair loss is unprece…
【background】. tritium (3h) labeling is an important tool for the study of pharmacokinetic and pharmacodynamic properties of drugs, radioautography, re…
influence of catalyst since the raw material systems of polyester polyol and polyether polyol are different, there are differences in reaction perform…
1、high closed pore rate (1) polyether polyol: high proportion of ethylene oxide, high activity, more occurring in the replacement of polyether polyol …
1. what is sprayed rigid polyurethane? sprayed rigid polyurethane is a new type of waterproof and thermal insulation material made of polymer by mixin…
there are many types of catalysts for polyurethane, with different catalytic activities and effects. in the production of polyurethane products, it is…
kinetics of the reaction of hydroxyl compounds with isocyanates – d(-nco)/dt = k0 × (-nco) × (-oh) k1 is the forward reaction rate for the compl…
rigid foam leveling agent (hereinafter referred to as “silicone oil”) model selection and dosage definition is of great importance, it is …
1、polyether as the main raw material, polyether reacts with isocyanate to produce carbamate, which is the skeleton reaction of foam products. in the c…
in a year when manufacturing supply chains have been hit hard, another shortage is making productive life harder for manufacturers and consumers: plas…
the greenhouse gas carbon dioxide (co2) is the end product of many chemical reactions, and its excessive emission will aggravate the global average te…
in the 1980s and 1990s, there were as many as 1,000 small and medium-sized ammonia plants, equivalent to almost one ammonia plant in every county in t…