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Polyisocyanate composition and preparation method and application thereof

A technology of polyisocyanate and diisocyanate, which is applied in the field of polyisocyanate composition of polyurethane paint and its preparation, can solve the problem that the color number of polyisocyanate composition is difficult to keep stable, and achieve excellent color number stability and good color number stability , high wear resistance effect

Active Publication Date: 2020-09-08
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the disadvantage that the polyisocyanate composition obtained by the reaction of isocyanate and low molecular weight polyol in the prior art is difficult to keep the color number stable during storage and use, and can obtain a polyisocyanate combination that can keep the color number stable for a long time thing

Method used

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  • Polyisocyanate composition and preparation method and application thereof
  • Polyisocyanate composition and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Under nitrogen protection, add 368.9 parts by weight of m-xylylene diisocyanate (XDI) into the reactor, heat and stir at 80°C, then add 52.6 parts by weight of trimethylolpropane dropwise into the reactor, dropwise After the completion, continue to stir and react at 80°C for 1 hour, and the obtained polyurethane prepolymer reaction solution enters the polyurethane prepolymer tank, and the above reaction solution has been mixed for 4 hours -1 The volume space velocity passes through the fixed bed of debromination agent A, and the reaction temperature is 70°C. Separation was then carried out using a thin-film distiller at a temperature of 145° C. and a pressure of 0.5 mbar. The separated prepolymer enters the dilution tank and dilutes with ethyl acetate to obtain the polyisocyanate composition of 75wt% solid content, and has the following parameters:

[0069]

[0070] Use this polyisocyanate composition to carry out the storage stability test at room temperature, and ...

Embodiment 2-8 and comparative example 1-3

[0072] Samples with different indicators were obtained by changing the raw material ratio of the prepolymer reaction solution, preparation conditions, debromination conditions, and residual diisocyanate monomer content. The conditions and results are shown in Table 2 below.

[0073] Condition and result of table 2 embodiment 1-8 and comparative example 1-3

[0074]

[0075] Note: except that the diisocyanate is TDI in Example 8, the diisocyanate in the remaining examples is XDI.

[0076] It can be seen from the above examples and comparative examples that by controlling the content of bromine-containing compounds in the polyisocyanate composition to be 0.2-30ppm as bromine, based on the total weight of the polyisocyanate composition, the content of residual diisocyanate monomers is controlled to be 0.5wt%. Next, a polyisocyanate composition with stable color number can be obtained, which can keep the color number stable for at least 12 months.

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Abstract

The invention discloses a preparation method of a polyisocyanate composition. The preparation method comprises the following steps: 1) a reaction process: reacting diisocyanate with a binary to quaternary organic polyhydroxy compound to obtain a prepolymer reaction solution; 2) a debromination process: debrominating the prepolymer reaction liquid, and controlling the content of a bromine-containing compound in the polyisocyanate composition to be 0.2-30 ppm based on bromine; and 3) a separation and purification process: removing a diisocyanate monomer from the product obtained in the step 2) so that the content of the residual diisocyanate monomer is 0.5 wt% or less based on the total weight of the polyisocyanate composition. The polyisocyanate composition has good color number stability,and the color number is kept stable after the polyisocyanate composition is stored for at least 12 months at room temperature.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to the field of polyurethane coatings. In particular, it relates to a polyisocyanate composition for polyurethane paint and its preparation method and application. Background technique [0002] Two-component polyurethane coatings include a polyisocyanate composition containing isocyanate groups as a curing agent and a macromolecular polyol as a main agent. The two are combined to form a polyurethane resin, which is widely used in the fields of coatings and adhesives. [0003] Polyisocyanates having urethane groups obtained from the reaction of low molecular weight polyols with toluene diisocyanate (TDI) or m-xylylene diisocyanate (XDI) have been known for a long time and are described, for example, in the German patent documents DE 870400, DE953012 and Chinese patents CN105940030, CN105026364. Such products are of great importance in the field of polyurethane paints and coatings, especiall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/82C08G18/76C08G18/32C08G18/10C08G18/79C08G18/09C08G101/00
CPCC08G18/82C08G18/7642C08G18/7614C08G18/3206C08G18/10C08G18/794C08G18/092C08G2190/00C08G2101/00
Inventor 朱付林尚永华李建峰王鹏贾峥瑞王勤隆王峤杨颖陈浩黎源
Owner WANHUA CHEM GRP CO LTD
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