Synthesis And Properties Of Silicone Modified Polyurethane Emulsion

Polyurethane has micro-phase separation structure due to its thermodynamic incompatibility between soft and hard segments,and has excellent mechanical properties,elasticity and durability.However,the traditional single polyurethane material has disadvantages such as high temperature resistance and poor water resistance.Due to the unique chemical structure of Si-O-Si chains,silicones have excellent chemical stability,such as high temperature resistance,low temperature resistance,electrical insulation,water and moisture resistance.By copolymerization modification,silicone and polyurethane can be combined.On the basis of the softness of silicone fabric finishing agent,the excellent elasticity and other properties of polyurethane are introduced,which gives the fabric a smooth,slippery and other style to meet people's textiles.Soft,slippery,and comfortable to wear.The main research contents of this paper are as follows:?1?Using anion ring-opening polymerization method,using octamethylcyclotetrasiloxane?D4?as raw material,1,3-bis?3-aminopropyl?-1,1,3,3-tetramethyldisiloxane?NH₂-MM?is a blocking agent,and tetramethylammonium hydroxide is used as a catalyst to synthesize?,?-aminopropylpolydimethylsiloxane?NH₂-PDMS?.A cationic silicone modified polyurethane emulsion was prepared from isophorone diisocyanate?IPDI?,N-methyldiethanolamine?MDEA?,trimethylolpropane?TMP?,and NH₂-PDMS.The optimal synthesis conditions of NH₂-PDMS are:the amount of tetramethylammonium hydroxide alkali gel is 1%of D4,the reaction time is4 h,the reaction temperature is 100°C,and the amount of blocking agent is 0.5%of D4;cationic organic The optimal synthesis conditions of silicon modified polyurethane emulsion are:ammonia value 1.0,MDEA dosage 7.0%,TMP dosage 0.5%,r value 0.4;ammonia value,MDEA dosage increase,cationic silicone modified polyurethane emulsion particle size becomes smaller,grain The diameter distribution is narrowed and the stability is increased;while the r value and the amount of TMP are increased,the particle size of the emulsion is increased,the particle size distribution is broadened,and the stability is lowered;the cationic silicone modified polyurethane emulsion can be used as a fabric finishing agent,which can be reduced.The MIU of the warp and weft of the fabric increases B and increases RC,which increases the smoothness of the finished fabric,increases the recovery ability after bending deformation,and improves the fabric resilience.?2?Using anion ring-opening polymerization method,octamethylcyclotetrasiloxane?D4?is used as a raw material,H₂O is a blocking agent,and tetramethylammonium hydroxide is used as a catalyst to synthesize?,?-hydroxypolydimethylsiloxane?OH-PDMS?.The optimal synthesis conditions for OH-PDMS are:tetramethylammonium hydroxide alkali gum is 1%of D4,reaction time is 6 h,reaction temperature is 100°C;isophorone diisocyanate?IPDI?,dihydroxyl Preparation of silicone-modified carboxylic acid type polyurethane prepolymer by using propylene glycol?DMPA?and OH-PDMS as raw materials,and then adding triethylamine to neutralize the prepolymer,sodium hydrogen sulfite end-cap,and deionized water emulsification.An anionic silicone modified polyurethane emulsion was obtained.The optimum synthesis conditions are:R value 2.0,hydroxyl value 1.0,DMPA dosage 7.0%;R value,hydroxyl value,DMPA dosage increase,anionic silicone modified polyurethane emulsion particle size becomes smaller,particle size distribution becomes narrower,stability Increase;anionic silicone modified polyurethane emulsion can be used as a fabric finishing agent,which can reduce the MIU of the warp and weft of the fabric,increase B,increase RC,increase the smoothness of the finished fabric,and increase the recovery ability after bending deformation.Increased flexibility.