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Preparation of Waterborne Polysiloxane Polyurethane

Aug 16, 2023

The epoxy group of the siloxane reacts with the sulfonyl or sulfonyl quaternary salt in the water-based polyurethane, and the epoxy siloxane is grafted onto the polyurethane chain, and polyoxypropylene glycol (PPG), toluene diisocyanate Polyester (TOI) was used as the main raw material, Y-glycidoxypropyltrimethoxysilane (CKH-560) was used as silicone modifier, and MOCA was used as chain extender to prepare silicone-modified polyurethane elastomer. The experimental results show that the epoxy group in KH-560 participated in the chemical reaction during the synthesis of the prepolymer, and the organosiloxane structural unit was introduced into the polyurethane main chain in a chemical bonding manner. Because KH-560 generates -OH after the reaction, which increases the content of the soft segment, and the branched chain structure destroys the regularity of the polyurethane main chain, so that the mechanical properties of the elastomer decrease significantly with the increase of the amount of KH-560. The addition amount of KH-560 directly affects the stability of polyurethane emulsion, and the addition amount and sequence of KH-560 have a significant impact on the mechanical properties and surface properties of polyurethane emulsion. Functional hydrolyzable alkoxysilane reaction products with isophenolic esters are used as backside coatings for wax-based heat transfer media to improve thermal stability and lubricity.

Hydroxyalkyl polysiloxane modification method
Hydroxyalkyl polysiloxane refers to the terminal group or side chain of polysiloxane with hydroxyalkyl group connected, and the copolymerization of the two is realized through the reaction of hydroxyl group and isophenolic acid ester. What is formed is the SI-C-0 bond, which has good hydrolytic stability.
The researchers synthesized polyurethane with MDI-BO as the hard segment and PDMS as the soft segment, and determined that its phase separation degree was 95%. Polyurethane resin was prepared by reacting bishydroxyhexyl-terminated polysiloxane (PDMS ROH) with H-MDI in a THF/dimethylformamide mixed solvent, and bisaminopropyl-terminated polysiloxane (PDMS- NHz) and bis(N-methylaminopropyl)-terminated polysiloxane were reacted with H-MDI, the mechanical properties and thermal properties of the products were compared, and the important role of hydrogen bonds in the design of copolymers was discussed. They also compared the effect of hydrogen bonding in the reaction product of PDMS-ROH, PDMS-NH2 with polyurethane, and polyethylene glycol (PEG), propylamine-terminated PEG with polyurethane.

In block copolymers (the hard segment is polyurethane or polyester), the thermal and mechanical properties largely depend on the degree of phase separation between the soft and hard segments, and a larger degree of phase separation can produce stronger Hydrogen bonds, which have better physical properties. The results show that strong intermolecular hydrogen bonds are formed in the polyurethane and polyester copolymers prepared from PDMS and polyester, and the hydrogen bonds between urea and siloxane are negligible, but the hydrogen bonds formed between urea and esters are more than ammonia The ester bonds are also stronger.

The researchers mixed hydroxyl-terminated polysiloxane, polymethyl glycol carbonate-2-methyl octamethyl glycol carbonate diol, BO and trimethylol propane as vulcanizing agents, and reacted with rvIDI to form film, resulting in an opaque, elastic film with phase-separated domains in the polysiloxane polyester polyurethane. Outdoor exposure experiments prove that the new polyester polyols with alkyl side chains can be used to improve the weather resistance of polyester polyurethane.

Reaction of polysiloxane (S00-1) or bishydroxyhexyl-terminated polysiloxane (SOD2) with isophorone diisooxyester (IPDI) and DMPA, Aqueous polysiloxane polyurethane (ADPSUR) was prepared. After the film is formed, the tensile strength of the film is good, but the elasticity is poor. Only when the Si(Me)20 segment content is very small, the elongation at break exceeds 100%. It has good adhesion to steel and good low-temperature viscoelasticity. , Water resistance and solvent resistance are also good, and weather resistance has not been further studied.
In some experiments, PPG replaced DMPA to reduce the cost of materials, and a moisture-cured polysiloxane polyurethane (MCPSUR) was prepared, which has great potential for application in coatings. The microphase structure of MCP-SUR is complex. The results of the study showed that, without PPG copolymerization, the length of the siloxane chain and the m(NCO)/m(OH) ratio determined the morphology of the samples; SAXS showed that these copolymers had a lamellar structure. If there is PPG copolymerization, the morphology will be more complex with the ratio of m(SOD)/m(PPG). When m(SOD)/m(PPG)=l/1, the sample is opaque, and large particles can be seen by TEM. The spherical polysiloxane phase is separated, but when m(S00)/m(PPG) =3/1, the sample presents a very special shape, the particle size is smaller and uniform, the sample is transparent, and the mechanical properties are also good.

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