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Polyisocyanate with good water dispersiveness
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A polyisocyanate and isocyanate technology, applied in the preparation of isocyanate derivatives, polyurea/polyurethane coatings, coatings, etc., can solve the problems of complex process and high energy consumption
Inactive Publication Date: 2006-04-26
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology
The internal emulsification method has contributed to the improvement of product performance, but the production of the blocking agent (monofunctional polyether) used in this method needs to be carried out in an autoclave, the process is complicated and the energy consumption is high
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Embodiment 1
[0019] (1) Synthesis of polyisocyanate:
[0020] In a four-neck flask equipped with a thermometer and a stirrer, under the protection of flowing nitrogen, add 168 g of monomer 1,6-hexamethylene diisocyanate and 1.6 g of trimerization catalyst, stir and heat, and control the reaction temperature to 50°C. During the reaction process, the viscosity of the system gradually increased, and samples were taken to measure -NCO. When the -NCO content is half of the initial amount, the reaction is terminated to obtain a light yellow transparent liquid which is a trifunctional polyisocyanate represented by formula (3).
[0021]
[0022] (2) Synthesis of sealing agent:
[0023] (a) In a four-necked flask equipped with a thermometer and a stirrer, under the protection of flowing nitrogen, add 168g of 1,6-hexamethylene diisocyanate monomer, 310g of decarboxylated cashew nut shell liquid, and add 0.5g of dibutyltin dilaurate catalyst, stirring and heating, and controlling the reaction te...
Embodiment 2
[0029] The synthesis of polyisocyanate, blocking agent and water-dispersible polyisocyanate is the same as in Example 1.
[0030] Preparation of amphiphilic surfactant as external emulsifier:
[0031] 239 g of the product of step (a) in Example 1 was reacted with 200 g of polyethylene glycol-800 in a four-necked flask equipped with a thermometer, a stirrer, and flowing nitrogen protection, and the temperature was controlled at 80 ° C. During the reaction process, samples are taken to measure -NCO, and when the -NCO content is zero, the reaction is terminated to obtain an amphiphilic surfactant compound (2) without hydroxyl groups at both ends.
[0032] The amphiphilic surfactant [compound (2)] without hydroxyl groups at both ends is added to the product (4) at a weight ratio of 1:100 to obtain a water-dispersible polyisocyanate with both internal emulsification and external emulsification.
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Abstract
The invention relates to a water-dispersible polyisocyanate, the main components of which are: aliphatic or / and aromatic polyisocyanate and monohydroxyl-terminated polyisocyanate produced by the reaction of decarboxylated cashew nut shell liquid, diisocyanate and polyethylene glycol Reaction of reagents to produce isocyanates with a functionality of at least 2. In addition, the water-dispersible polyisocyanate of the present invention can also be prepared from the decarboxylated cashew nut shell liquid as a raw material with a surfactant (external emulsifier) without hydroxyl groups at both ends in a ratio of 100: 1 to 5 by weight. Mixing, the dispersibility and stability of the obtained product in water are better. The biggest advantage of the present invention is that it adopts a sealing agent and an external emulsifier which are rich in raw materials and easy to prepare.
Description
technical field [0001] The present invention relates to a water-dispersible polyisocyanate. technical background [0002] Waterborne polyurethane is a pollution-free coating material that is currently being promoted, and is widely used as coatings and adhesives. Such polyurethanes can be divided into one-component and two-component types. One component of the two-component waterborne polyurethane is a multifunctional polyurethane prepolymer aqueous dispersion containing hydrophilic monomers, and the molecular chain ends are hydroxyl or amino groups, and the other component is water-dispersible functionality in 2 The above polyisocyanates. When these two components are mixed, the isocyanate on the polyisocyanate reacts with the primary hydroxyl group or amino group at the end of the polyurethane prepolymer to form a crosslinked network, which can overcome the relatively poor water resistance of the one-component non-crosslinked waterborne polyurethane. Poor shortcomings, a...
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