Defoaming mechanism1. The decrease of the local surface tension of the foam leads to the collapse of the foamThe origin of this mechanism is to sprinkle higher alcohol or vegetable oil on the foam. When it dissolves into the foam liquid, it will significantly reduce the surface tension there. Because these substances are generally less soluble in water, the reduction of surface tension is limited to the part of the foam, and the surface tension around the foam hardly changes. The part with reduc ...

Solvent-free impregnating varnish is widely used in the VPI insulation treatment of motor coils in high-end fields such as high-voltage motors, high-speed traction motors, and spacecraft engines. Silicone materials have the advantages of high temperature resistance and corona resistance, and are more suitable for insulation in the above fields deal with. With the continuous development of my country's high-speed railway, subway, light rail, and magnetic levitation technology, insulating material ...

Organic silicone adhesive has unique heat resistance and low temperature resistance, good electrical properties and weather resistance, chemical stability, hydrophobic moisture resistance, oxidation resistance, workability, sealability, breathability and elasticity, etc. The electrical performance changes very little over a wide temperature range and the dielectric loss is low. It can be made into high-grade sealing materials, which are mainly used for sealing bonding of window glass and glass c ...

Application and selection of defoamers for water-based coatings. The water-based paint defoamer is a composite product of organic polyether ester, mineral oil, and alcohol. It will not produce surface defects or affect the film-forming properties, and has a special effect on the water-based paint system.product manualUsing water instead of organic thorns to prepare paint is safe, inexpensive and hygienic. After the emergence of synthetic resins, water-based coatings developed rapidly. Water-base ...

International Labor Day, also known as "May 1 International Labor Day", is a national holiday in more than 80 countries around the world. Set on May 1st of each year. It is a festival shared by working people all over the world.On October 25, 2021, the "Notice of the General Office of the State Council on the Arrangement of Some Holidays in 2022" was released, and there will be 5 days off from April 30, 2022 to May 4, 2022. April 24 (Sunday) and May 7 (Saturday) for work.

What is silicone rubber. How is silicone rubber classified?Silica gel is a kind of highly active adsorption material, which is an amorphous material. It contains polysiloxane, silicone oil, silica, coupling agent and filler. The main component is silica, and its chemical formula is msio2 nH2O. Insoluble in water and any solvent, non-toxic and tasteless, stable chemical properties, no reaction with any substance except strong base and hydrofluoric acid. Different types of silica gel have differen ...

Technical fieldThe invention relates to a catalyst suitable for insulating impregnating varnish and a preparation method thereof. In particular, it refers to a solvent-free organic silicon insulating dipping varnish catalyst and a preparation method thereof. The preparation method of the catalyst is mainly used for preparing a solvent-free organic silicon insulating dipping varnish catalyst.Background techniqueInsulating impregnating varnish is a kind of insulating material, which is mainly used ...

 Design basis Basis of the research report[1] The current demand and development trend of C-level solvent-free organic silicon impregnating varnish at home and abroad;[2] C-level solvent-free organic silicon dipping paint project design and development proposal.[3] C-level solvent-free organic silicon impregnating varnish development and industrialization trial and pilot evaluation report;[4] The subject area of ​​the project: chemical science, polymer chemistry, polymer synthesis, c ...

In the formulation, the main functions of surfactants are: one is to improve the emulsifying ability between the components, so that they can be more effectively mixed with each other; the other is to control the system to have proper surface tension during the foaming process to produce a good Bubble network structure, therefore, can also be called foam stabilizer. Polyester and polyether flexible foam have different raw material bases and different properties. Therefore, the selection and dosa ...

OverviewSilane coupling agent is a kind of low molecular organosilicon compound with special structure. Its general formula is RSiX3, where R represents amino, mercapto, vinyl, epoxy, cyano and methyl propionyloxy groups. Groups, these groups and different matrix resins have strong reactivity, X represents a group that can be hydrolyzed, such as halogen, alkoxy, acyloxy and so on. Therefore, the silane coupling agent can not only interact with the hydroxyl in the inorganic substance but also wit ...