Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Stable NDI (naphthalene diisocyanate) prepolymer as well as preparation method and application thereof

A prepolymer and stable technology, applied in the field of stable NDI prepolymer and its preparation, can solve the problems of difficult storage, loss of product performance, and deterioration of prepolymer.

Active Publication Date: 2017-05-10
SHANDONG INOV POLYURETHANE
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because NDI is an extremely active compound, the storage stability of the synthesized prepolymer is not good, and it will continue to react in a short period of time, resulting in such a prepolymer being unstable and difficult to store. In actual production, the synthetic prepolymer is generally synthesized After the polymer is used, it must be used up within 30 minutes. Over time, the NCO% content will decrease, the prepolymer will become muddy and deteriorate, and the product performance will be lost.

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
  • Stable NDI (naphthalene diisocyanate) prepolymer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation of polyester polyol is obtained by the following preparation method: in terms of weight percentage, 66.7% of adipic acid and 33.3% of ethylene glycol are added to the reaction kettle for heating, and nitrogen protection is applied. When the temperature rises to 130°C, water is produced , control the temperature at the top of the reflux tower at 102°C, and then raise the temperature to 230°C. After the water is discharged, keep it warm for 3 hours, and then use the nitrogen bubbling process to remove the water produced by polycondensation. When the acid value of the material in the kettle is less than 0.4 mg KOH / g, when the moisture content is below 0.05%, the product is qualified, and the temperature is lowered and the material is discharged to obtain a polyester polyol with a molecular weight of 1500.

[0029] The preparation method of the stable NDI prepolymer, by weight percentage, the above-prepared polyester polyol 76.4% and antioxidant 0.3% are heat...

Embodiment 2

[0032] The preparation of polyester polyol is obtained by the following preparation method: by weight percentage, 68% of adipic acid, 28.8% of ethylene glycol, and 3.2% of 1,2 propylene glycol are added to the reaction kettle for heating, and nitrogen protection is applied. When the temperature When the temperature rises to 140°C, the reaction will produce water. Control the temperature at the top of the reflux tower at 100°C, and then raise the temperature to 220°C. When the acid value of the inner material is less than 0.4mg KOH / g, and the moisture content is less than 0.05%, the product is qualified, and the material is cooled and discharged to obtain a polyester polyol with a molecular weight of 2000.

[0033] The preparation method of the stable NDI prepolymer, by weight percentage, heat the polyester polyol 82.4% and antioxidant 0.2% prepared above to 130°C, then add NDI 17.4% and mix evenly, and react at 125°C for 30 Minutes, vacuum (-0.095MPa) to remove air bubbles to ...

Embodiment 3

[0036] The preparation of polyester polyol is obtained by the following preparation method: by weight percentage, 68.3% of adipic acid, 28.5% of ethylene glycol, and 3.2% of 1,2 propylene glycol are added to the reactor for heating, and nitrogen protection is applied. When the temperature When the temperature rises to 140°C, the reaction will produce water. Control the temperature at the top of the reflux tower at 100°C, and then raise the temperature to 220°C. When the acid value of the inner material is less than 0.4mg KOH / g, and the moisture content is less than 0.05%, the product is qualified, and the material is cooled and discharged to obtain a polyester polyol with a molecular weight of 2500.

[0037] The preparation method of stable NDI prepolymer, in weight percentage, heat 85.6% of the above-prepared polyester polyol and 0.2% of antioxidant to 130°C, then add NDI 14.2% and mix evenly, react at 130°C for 30 Minutes, vacuum (-0.095MPa) to remove air bubbles to obtain N...

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

PropertyMeasurementUnit
acid valueaaaaaaaaaa
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of chemical engineering synthesis, and particularly relates to a stable NDI (naphthalene diisocyanate) prepolymer as well as a preparation method and application thereof. The preparation method of the stable NDI prepolymer comprises the following steps: (1) preparation of polyester polyol; (2) preparation of the stable NDI prepolymer. According to the stable NDI prepolymer, the problems that NDI is unstable and hard to store after being synthesized into the prepolymer are solved; in a process of preparing polyester, no catalysts are added, so that no catalyst residues exist in the polyester polyol; furthermore, a proper amount of antioxidant is added in the process of synthesizing the prepolymer, so that continuous reaction within a short period is cut off, and the stable NDI prepolymer is prepared, which can be stored for 6 months.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a stable NDI prepolymer and its preparation method and application. Background technique [0002] Polyurethane elastomer is a polymer synthetic material between plastic and rubber. It has excellent wear resistance, good mechanical strength, oil resistance, low temperature resistance, ozone aging resistance and other properties, so it is widely used in rubber rollers and oil seals. , Automobile tires and other fields. Polyurethane elastomers are divided into TDI type, MDI type, PPD type, NDI type and other prepolymers according to the different isocyanates used. Various types of polyurethane elastomer products have their own advantages and disadvantages. Compared with other types of elastomers 1,5 Naphthalene diisocyanate (NDI) elastomers have excellent dynamic properties and heat and oil resistance. However, because NDI is an extremely active compound, th...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/32C08G18/10C08K5/134
CPCC08G18/10C08G18/3206C08G18/4238C08G18/664C08G18/7678C08K5/1345
Inventor 刘兆阳陈海良张芳孙汉禄
Owner SHANDONG INOV POLYURETHANE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
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