Synthesis of Silicone Modified Polyurethane

Using secondary amine-terminated polyamine and/or PT-MO to react with MDI, BD as a chain extender, dimethylacetamide and toluene as solvents, a polyurethane choroider and a glass with soft segment PDMS can be observed The temperature change (8) and change with the components, the results show that the PDMS phase is separated from the PTMO and hard segments. The permeability of block copolymers to gases and liquids is reviewed. It is mentioned that the separation membrane of the ethanol/water mixture initialized with the cross-linked raw material made of the reservoir and the end-capped PDMS/MDI/BD, which only allows the separation of ethanol, and the separation factor is related to the amount of PDMS.

The researchers synthesized a, cylinder bis(y aminopropyl) dimethyl diphenyl polysiloxane, investigated its refractive index, several, solubility parameters and thermal stability, and then combined it with PTMO and isophenolate The thermal stability, dynamic mechanical properties, mechanical properties and in vitro anticoagulant properties of the product were discussed, which can be used for blood-soluble biomaterials. Membranes of aminopropyl-terminated polydimethylsiloxane and poly(dimethylsiloxane-urethane) multiblock copolymer (CPU-DMS) were studied by time-of-flight secondary ion mass spectrometry.

The results show that the distribution of isolated PDMS segments on the surface of PU-DMS is the same as that in bulk, and the weight average molecular weight of PDMS is about 1000.

Silane coupling agents were originally developed as glass fiber treatment agents for glass fiber reinforced plastics. With the advent of a series of new silane coupling agents, especially their unique properties and significant modification effects, their application fields have continued to expand, and they have gradually become an important branch of the silicone industry. Alkoxysilane refers to some functional organosilane monomers, silanes with carbon functional groups and hydrolyzable groups at the same time, Y is amino, alkylene oxide, alkenyl and other functional groups, X is alkoxy, R represents c-c bridge.

Because the alkoxy group is hydrolyzed to generate silanol SiOH, and the silanols are further condensed to obtain a silicon-oxygen chain, which makes the surface structure of the material compact and the mechanical properties are changed. It can be combined with glass, silicon dioxide, metals and their oxides, etc. The surface of inorganic substances produces chemical and physical bonds, and carbon functional groups can form chemical bonds with organic materials such as organic resin rubber, so they can be used to increase the interface bonding between inorganic and organic substances and improve the performance of the composite.

Its cross-linked modified polyurethane is usually divided into two steps: the synthesis of polyurethane prepolymer and the synthesis of silane-terminated polyurethane:

(1) polyamide reacts with a certain amount of diisocyanates such as MDI or IPDI to obtain Polyurethane, by selecting m(NCO)/m(OH)>l or <1 to prepare polyurethane prepolymers whose end groups are NCO or OH.

(2) Add functional organosilane for reaction, the end group is NCO prepolymer, and hydrogen active organofunctional silane [such as N-phenyl-(-aminopropyltrimethoxysilane)] can be added; the end group If it is a prepolymer of OH, add an organic functional silane active with isonitrogen acid (such as gamma-isoalcyl-propyltrimethoxysilane) for reaction, so that the terminal group of the polyurethane prepolymer is connected with a hydrolyzable silane. Its curing mechanism is very similar to silicone sealant, but the cost is reduced, and its application prospect is very broad.

Our main products are Silicone Resin for Mica Insulation Materials，Silicone Resin for Motor，Silicone Resin for transformer coils，Silicone Resin for H-class motors，Silicone Resin for motor coil wrapping，Silicone Resin Elastomer Suspension.If you have any questions about silicone resin,please contact us.