Preparation of Polyurethane Resin
Jul 27, 2023
The crosslinked polyester polysiloxane polyurethane resin was prepared with polyethylene glycol Adipic acid (PE-GA), PDMS-OH, 4,4 '- diphenylmethane diisobalate (MDI) and diglycerol maleate polyol. PDMS-OH has little effect on the mechanical properties of the final material, but it improves the stability and elasticity of the modified resin at low temperatures, and has better thermal stability. They also prepared polysiloxane polyurethane (PDMS PU) block copolymers using PEGA, butanediol CBD, MDI, TDI, or 1,6-hexanedisobutyrate (HDI). Transmission electron microscopy (TEM) study shows that the spherical particles containing polysiloxane (PDMS) are uniformly dispersed in the continuous polyester polyurethane matrix, which is a two-phase system. Two prepolymers are synthesized, one is octamethylcyclotetrasiloxane (D4), which is polymerized with PE after ring opening in tetrahydrofuran (THF) solution of phenyl Trimethylamine siloxane GA and MDI react in the presence of catalysts; The other is the reaction between PDMS and MDI under the same conditions. After mixing the two types of prepolymers, MDI and BD are added, and then poured into a film. The properties of the films were measured by differential thermal analysis (DSC) and dynamic mechanical property analyzer (DMA).
The blue light milky white micro transparent lotion can be obtained by prepolymerization of polyacyl 210, 220 and 2,4-toluene diisobalate (TDI), adding acetone diluted tibial silicone oil, N-methyl Diethanolamine, chlorinated knots and ester acid, and then adding water. This self emulsifying cationic silicone polyurethane lotion can improve the brightness, softness, water resistance and hand feel of the film. The product can be used as leather finishing agent, hand feel agent, waterproof agent, etc.
Silicone Modified Polyurethane Aqueous Emulsion
Use octamethylcyclotetracoupling clay (D4) with bentonite as the catalyst and acetate as the molecular weight to obtain a polyether low coupling agent (PDMSOH) with a mass of 200-600, and then react with TDI and polyethylene glycol (PEG) in acetone to obtain a silicone-polyurethane prepolymer with an iso-neonyl group, extend the chain with 3-(N-methylethanol dichloride)-1,2-propylene oxide, and add water to emulsify to obtain a cationic silicone-polyurethane prepolymer. Segmented water emulsion. Used as a fabric finishing agent, it can improve the surface performance, hygroscopicity and antistatic properties of the fabric, and at the same time improve the mechanical properties and wear resistance of the fabric, and discuss the water property.
The silicone-modified polyurethane aqueous emulsion for leather finishing agent was synthesized by solution copolymerization and salt-forming emulsification, which can significantly improve the mechanical properties and solvent resistance of the film. The leather treated with the modified solution has a higher level of wet rub resistance, and feels smooth and comfortable. However, the reaction between silicone and polyurethane is very incomplete, and the reaction degree is small, and the formed S!—(}--C structure has poor hydrolysis resistance.
In addition, polysiloxane diol emulsion is used as a chain extender, mixed with water-based polyurethane emulsion, catalyst and water are added, and it shows printability when applied to paper, and the detachment strength is 29. 6gf/cm, which is a detachable coating.
ABA-type block copolymers containing PDMS and ketone resins were synthesized. Firstly, polysiloxane polyurethanes terminated by double NCO groups were obtained by reacting PDMS terminated with dihydroxy groups with isophorone diisophenolate (IPDI). Then, they were further reacted with cyclohexanone-formaldehyde resins containing active hydroxyl groups, acetophenone-formaldehyde resins and cyclohexanone-formaldehyde resins modified by in-situ trimeramines. The obtained resin exhibits unique properties due to the combination of highly surface-active siloxane segments, and has good compatibility with ketone resins. This ABA-type resin can be used as an additive.
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