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Aug 23, 2021
In order to reduce costs, improve certain properties of the waterborne polyurethane film-forming material, or combine the performance advantages of two or more polymers, and complement each other, blending or grafting can be used to prepare blends or copolymers.
The graft copolymerization of organosilicon and water-based polyurethane adopts a self-emulsifying system to obtain water-based polyurethane-silicone copolymer emulsion. For example, by reacting dimethyldichlorosilane with EO chain-containing glycols such as triethylene glycol and polyethylene glycol to obtain hydroxyl-terminated organosilicon oligomers, and then reacting with polyether glycol and TDI Random copolymerization prepared water-based silicone block polyurethane. Someone modified the block silicone resin containing PEG segments by preparing a monoblock isocyanate to prepare a water-based reactive polyurethane modified silicone fabric finishing agent. After heat treatment, the silicone resin and the fabric fiber can produce chemical In combination, the lack of washing resistance of the organosilicon finishing fabric is improved. Silicone-modified waterborne polyurethane is resistant to dry and wet rubbing when used in the top layer of leather, soft to the touch, and strong in leather. It can also be used as adhesive for non-woven fabrics, paper and moisture-proof coatings on building surfaces, etc.
The carboxylate group-containing polyurethane prepolymer is chain-extended and emulsified in water containing a small amount of amino silicone oil emulsion to prepare a stable silicone grafted modified polyurethane emulsion. The surface is studied, and the silicone is rich on the surface of the film. It has obvious surface modification effect on polyurethane materials, and the water resistance of the film is improved, but the physical properties are not changed much.
Polypropylene carbonate diol (PPC) is used as the raw material for the soft segment of the polyurethane prepolymer, 1,4-dihydroxypropionic acid (BDO), and isophorone diisocyanate (IPDI) are used as the raw material for the hard segment. 2-Dimethylolpropionic acid (DMPA) is used as a hydrophilic chain extender to synthesize polyurethane prepolymer. Utilizing the reactivity of -NH2 and -CNO, the waterborne polyurethane prepolymer is connected with self-made ternary block silicone oil, Water emulsification to prepare a copolymer emulsion of polyurethane and silicone. The finishing agent was applied to cashmere knitted fabrics, and the anti-pilling performance and hand feel of the finished fabric were measured. The finishing agent was characterized by infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) showed the wrapping effect of the finishing agent on the surface of cashmere fibers, and the results showed that: the silicone segment was successfully connected to the water-based polyurethane macromolecule, and the expected molecular structure was synthesized. Self-made silicone polyurethane copolymer finishing agent Compared with the traditional pure resin finishing or silicone oil finishing, the anti-pilling effect is improved by 1-2 levels, and the hand feel is also improved.
Organosiloxane polymer is a new type of environmental protection material, with excellent weather resistance, anti-aging, UV resistance, good skin affinity, mildew resistance, stain resistance and many other excellent properties. Products produced using siloxane materials can easily pass the US SGS certification and the European LFGB certification. It is widely used in baby pacifiers, kitchen utensils, fabric coating, medical microfluidics and other fields.
Water-based silicone resins have been used in textiles, brand labels, etc. as high-end materials by screen printing. As people continue to yearn for a better life. The continuous development of the application field of water-based silicone resin has gradually found its position in the high-end synthetic leather industry. Compared with PVC and PU, silicone leather has natural advantages in environmental protection and production technology. Water-based silicone resin is the future trend of synthetic leather and will definitely become a dark horse in synthetic leather. Meet the people's requirements for a better living standard.