Polyisocyanate curing agent with good storage stability and preparation method thereof

A technology of polyisocyanate and storage stability, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems affecting product performance and lower product quality, and achieve low content, good storage stability, and low color number Effect

Active Publication Date: 2019-05-31
WANHUA CHEM GRP CO LTD
View PDF18 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the heat sensitivity of polyurethane adducts, high temperature separation will lead to the production of high molecular weight polymers, which will occur if the adduct products with high solid content (solid content above 70%) are stored at zero degrees Celsius Physical curing, affecting the performance of the product, thereby reducing product quality

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
  • Polyisocyanate curing agent with good storage stability and preparation method thereof
  • Polyisocyanate curing agent with good storage stability and preparation method thereof
  • Polyisocyanate curing agent with good storage stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Under the protection of nitrogen, add 10kg of toluene diisocyanate into the reaction kettle, heat and stir at 50°C, then drop the mixed alcohol composed of 600g of diethylene glycol and 1.5kg of trimethylolpropane into the reaction kettle, after the dropwise addition, After continuing to stir and react at 50° C. for 1 hour, the resulting polyurethane prepolymer reaction liquid enters the polyurethane prepolymer tank, and 0.06 wt % of dioctyl phosphate is added; and at a temperature of 175° C. and a pressure of 0.5 mbar, then Separation was carried out using a thin film evaporator. The separated prepolymer enters the dilution tank and dilutes with ethyl acetate to obtain the polyisocyanate curing agent of 75wt% solid content, and has the following parameters:

[0034]

[0035]

Embodiment 2

[0037] Under the protection of nitrogen, add 15kg of toluene diisocyanate into the reaction kettle, heat and stir at 60°C, then drop the mixed alcohol composed of 1kg of ethylene glycol and 2.2kg of trimethylolpropane into the reaction kettle, after the dropwise addition, After continuing to stir and react at 60° C. for 2 hours, the resulting polyurethane prepolymer reaction solution entered the polyurethane prepolymer tank, and added 0.08 wt % monooctyl phosphate; and at a temperature of 170° C. and a pressure of 0.1 mbar, then Separation was carried out using a thin film evaporator. The separated prepolymer enters the dilution tank and dilutes with ethyl acetate to obtain the polyisocyanate curing agent of 75wt% solid content, and has the following parameters:

[0038]

Embodiment 3

[0040] Under the protection of nitrogen, add 5kg of toluene diisocyanate into the reaction kettle, heat and stir at 55°C, then drop the mixed alcohol composed of 400g of diethylene glycol and 600g of trimethylolpropane into the reaction kettle, after the dropwise addition, After continuing to stir and react at 70° C. for 2 hours, the resulting polyurethane prepolymer reaction solution entered the polyurethane prepolymer tank, and added 0.1 wt % dibutyl phosphate; and at a temperature of 165° C. and a pressure of 0.1 mbar, then Separation was performed using a short-range hair dryer. The separated prepolymer enters the dilution tank and dilutes with ethyl acetate to obtain the polyisocyanate curing agent of 75wt% solid content, and has the following parameters:

[0041]

[0042]

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 relates to a polyisocyanate curing agent with good storage stability and a preparation method thereof. The preparation method comprises the steps of (1) subjecting excessive toluene diisocynate and a hydroxy compound to reaction to obtain a prepolymer reaction liquid containing a toluene diisocynate monomer; (2) adding an organic acid with pKa value of 1-15 into the prepolymer reaction liquid of the step (1), and separating the non-reacted isocyanate monomer; (3) adding an organic solvent to the reacted liquid of the step (2) with the isocyanate monomer separated, and diluting toobtain the finished polyisocyanate curing agent. The content of hydroxy groups in the polyisocyanate curing agent is controlled by adding the organic acid; the prepared polyisocyanate curing agent has good storage stability and also has the advantages of small color number, low content of free isocyanates and the like.

Description

technical field [0001] The invention belongs to the field of coating curing agents, and further relates to a preparation method of a polyisocyanate curing agent with storage stability and the prepared curing agent. Background technique [0002] The coating film of polyurethane coating has the advantages of high hardness, good toughness, strong chemical resistance and fast drying. It is one of the most widely used solvent-based coatings with excellent performance. Dominant in furniture wood coatings. Polyurethane coatings are mainly composed of two components, one is a hydroxyl component such as alkyd resin, polyester resin or acrylic resin, and the other is a key component of polyurethane curing agent. [0003] Polyurethane curing agents are widely used in high-performance coatings, paints, adhesives, decorative building materials, elastomers, and household commodities. The flexible polyurethane chemistry gives these commodities excellent properties, such as compatibility ...

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): C08G18/80C09D175/04
Inventor 张晓鹏王玉启王暖程李海军黄真真李文滨张谦石滨尚永华黎源
Owner WANHUA CHEM GRP CO LTD
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap