Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of colorless polyisocyanate composition

A technology of polyisocyanate and diisocyanate, which is applied in the field of preparation of colorless polyisocyanate composition, can solve problems such as complex, poor chromaticity stability of the composition, unfavorable chromaticity stability of the product, etc., and achieves easy realization, simple operation and cost saving Effect

Pending Publication Date: 2022-02-11
WANHUA CHEMICAL (NINGBO) CO LTD +1
View PDF18 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of these methods is that the added peroxides and degradation products of the original color-producing components remain in the product, which is detrimental to the color stability of the product
[0007] It can be seen from the prior art disclosed above that the currently disclosed methods for preparing colorless polyisocyanate compositions are generally more complicated, or the color stability of the resulting composition is relatively poor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of colorless polyisocyanate composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] at 10m 3 Add 8m to the reactor 3 For the diisocyanate monomer, an inert gas (as shown in Table 1) was passed into the reactor at a certain flow rate, and the temperature of the system was raised to 70°C. Then add 12.6kg, 10% of 2-ethylhexanoic acid-N-(2-hydroxypropyl)-N,N,N-trimethylammonium salt in isooctyl alcohol (about 150ppm relative to the diisocyanate monomer ), control the reaction temperature at 70° C.; detect the reaction process by measuring the NCO content of the reaction solution, and when the reaction conversion rate reaches 41%, add 1.56 kg of dibutyl phosphate (about 185 ppm relative to the diisocyanate monomer) to terminate the reaction. Next, use a thin film evaporator to distill twice under the conditions of 150° C. and 30 Pa to obtain a polyisocyanate composition with a diisocyanate monomer content of less than 0.2%.

Embodiment 2-12 and comparative example 1-3

[0053] Referring to the method substantially the same as Example 1, Examples 2-12 and Comparative Examples 1-3 were prepared to prepare different polyisocyanate compositions, the only difference being that the reaction raw materials and parameters were adjusted as shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method of a colorless polyisocyanate composition. The method comprises the steps of in a polymerization reaction kettle in which inert gas is continuously introduced for replacement, carrying out polymerization reaction on diisocyanate monomers under the action of a trimerization catalyst, and terminating the reaction after the reaction is completed to obtain a reaction liquid; and evaporating the reaction liquid to remove unreacted monomers so as to obtain the polyisocyanate composition. The method is characterized in that in the polymerization reaction, the replacement rate of the inert gas is controlled to be 0.2-10. By controlling the inert gas replacement rate in the reaction process, the polyisocyanate composition with low chromaticity and excellent thinning stability is obtained.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of a colorless polyisocyanate composition. Background technique [0002] Polyisocyanate compositions with an isocyanurate structure derived from aliphatic diisocyanates are widely used in high-end coatings such as automotive refinish paints, varnishes, and wood coatings due to their excellent chemical resistance, heat resistance, and weather resistance . In these coatings fields, polyisocyanate compositions used as curing agents tend to be low in chroma due to emphasis on appearance. [0003] At present, many patents disclose low-chroma polyisocyanate compositions and their preparation methods. The main preparation techniques include controlling the carbon dioxide content in the raw material monomers, treating with ozone or peroxide, and irradiating with light of a certain wavelength, such as: [0004] EP0330966A2 describes a method for controlling CO in monomers 2 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08G18/79C08G18/09C07C263/16C07C265/14
CPCC08G18/792C08G18/092C07C263/16C07C265/14
Inventor 王少华孙立冬任一臻史培猛王暖程胡浩杨文学孙积钊韩海涛
Owner WANHUA CHEMICAL (NINGBO) CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com