Method for preparing polyisocyanate containing biuret
A technology of polyisocyanate and diisocyanate, which is applied in the field of preparing polyisocyanate containing biuret, can solve the problems of high production cost, high viscosity of polyisocyanate, unfavorable construction and use, etc., to reduce viscosity, increase reaction steric hindrance, and save production cost effect
Active Publication Date: 2014-04-16
WANHUA CHEM GRP CO LTD +1
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Problems solved by technology
[0007] The existing method for preparing polyisocyanate containing biuret contains relatively high content of macromolecular polymers such as high polybiuret in the product. Therefore, the prepared polyisocyanate containing biuret has a high viscosity, which is not conducive to construction. use, limiting its application in the field of high solid polyurethane
In addition, the catalysts in the existing methods cannot be effectively recovered and recycled, which makes the production cost higher
Method used
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Effect test
Embodiment 1-10
[0030] 500 g of HDI was placed in a round bottom flask equipped with a reflux condenser, stirrer, steam generator and nitrogen inlet.
[0031] Add 100-5000ppm of corresponding catalysts to HDI based on HDI, stir evenly, preheat to reaction temperature, and nitrogen gas is bubbled in at the same time. Then, 10L / h nitrogen / steam mixed gas (nitrogen / steam volume ratio 10:1) is passed into HDI for reaction. The reaction process is detected by the decrease of NCO. When the content of NCO reaches 40wt% of the total mass of the reaction system , stop feeding water vapor, continue to stir and react at the reaction temperature for 0.5 h under a nitrogen atmosphere, and drop to 30°C. After the reaction, Examples 1-9 used electromagnet magnetic adsorption to recover the catalyst, and Example 10 used membrane filtration to recover the catalyst. The remaining HDI was distilled and separated by a thin film evaporator to obtain colorless biuret-containing polyisocyanate final products 1#-10...
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Abstract
The invention relates to a method for preparing polyisocyanate containing biuret. The method comprises the step of catalyzing the reaction of water and diisocyanate by using a nano-solid sulfonic acid catalyst, wherein the nano-solid sulfonic acid catalyst is a solid sulfonic acid catalyst which immobilizes or deposits a sulfonic acid group on a nano-material by a covalent bond or intermolecular force, and the nano-solid sulfonic acid catalyst catalyzes the polymerization reaction of water and diisocyanate in a heterogeneous phase form in a reaction medium. By adopting the nano-solid sulfonic acid catalyst provided by the invention, the generation of polybiuret can be inhibited, and the color number and viscosity of a product are reduced. The method has the advantages of capability of recovering the catalyst for recycling, no residue of the catalyst in a reaction system, and the like.
Description
technical field [0001] The present invention relates to a method for preparing polyisocyanate containing biuret, more specifically to a method for preparing high polybiuret (hereinafter referred to as high polybiuret) with low content and low viscosity with low color number and molecular weight greater than 2000 method of polyisocyanate. Background technique [0002] Aliphatic and / or cycloaliphatic biuret polyisocyanates are widely used in the production of coating compositions, adhesives, sealants, waterproofing agents, foams, elastomers, fiber treatments, etc. German patent DE1101394A discloses a preparation method of polyisocyanate having a biuret structure. In the public document "The Synthesis of Aliphatic Polyisocyanates Containing Biuret, Isocyanurate or Uretdione Backbones for Use in Coatings" (J.prakt.Chem.336,1994,185-200), the preparation of biuret structure by acid-catalyzed water and diisocyanate Some methods of polyisocyanate are described. Due to the high ch...
Claims
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IPC IPC(8): C07C275/62C07C273/18C08G18/32C08G18/16
CPCY02P20/584
Inventor 唐义权尚永华李建峰石滨华卫琦黎源
Owner WANHUA CHEM GRP CO LTD