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Aug 1, 2023
Due to the large relative molecular weight of hydroxy silicone oil, the addition amount is small, and the molecules of polyurethane formed are small. Easy to emulsify to produce a blue stable emulsion, when the content increases, the opposite is true. The hydroxyl group is indirectly blocked, and the -OH group in the silicone oligomer diol is connected to the silicon atom through an alkyl or acyl bond. After reacting with -NCO, no Si-O-C bond is formed, and the stability is good. Using polytetrahydrofuranoyl glycol, toluene-2,4-diisophenate (TOI), and 2,2-dimethylolpropionic acid as raw materials, and dihydroxy tetracoordinated silicon monomer as chain extender, using Silicon-modified waterborne polyurethane was prepared by two-step synthesis method. Compared with ethylenediamine as chain extender, waterborne polyurethane synthesized with dihydroxy tetracoordinate silicon as chain extender has improved water and heat resistance.
The core-shell polyurethane was synthesized with TOI, EG, and hydroxyl-terminated PDMS as raw materials, and the mechanism of particle formation was studied. It is found that -OH is more hydrophobic than -NCO, which makes the polymerization reaction much faster. Since EG, TOI and PDMS are added at the same time, a core containing block copolymer (PDME-PUR) and polyurethane is first formed. After adding TOI reaction In the early stage, due to the swelling of the EG core, the added TD] formed a core-shell polymer through penetration and reaction of alcohol functional groups, and the size of the core-shell particles did not change.
Hydroxypolyethyl ester-terminated EPDMS and hydroxyalkyl-terminated APDMS were used to synthesize water-based polyurethanes as soft segments, and the crystal structure and properties were studied. It was found that the two modified water-based polyurethanes made the conventional The structure of the material is destroyed, a stable crystal form cannot be formed, the ability to form hydrogen I bonds is reduced, the tensile strength of the material is reduced, and the elongation is increased. Since the EPDMS chain is stronger and softer than the APDMS chain, the EPDMS-modified material has more chances to form hydrogen bonds than APDMS, and the phase separation is better than APDMS. EPDMS-modified water-based polyurethane is better than APDMS-modified High tensile strength and high elongation at break.
Our main products are Silicones in Hair Care，Silicone Resin Blend for Personal Care，Dimethicone Silicone Resin Blend，Amino Phenyl Silicone Resin，Silicone Resin Modifier for Artificial Leather，Synthetic Leather Silicone Resin Modifier.