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Preparation method and application of polycaprolactone polyol

A polycaprolactone and polyol technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of small improvement in corrosion resistance, weakening of electrostatic force, and decline in material impact resistance, achieving Improve hydrolysis resistance and weather resistance, improve acid and alkali resistance, and increase the effect of rebound performance

Active Publication Date: 2022-04-01
HUNAN JUREN CHEM NEW MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used method in the industry to improve the corrosion resistance of polyurethane elastomers and coatings is to use multifunctional polyols or multifunctional chain extenders to increase the degree of chemical crosslinking, but when the chemical crosslinking structure increases, it will hinder The hard chain segments are close to each other, the electrostatic force is weakened, and hydrogen bonds are difficult to form, which affects the microphase separation and reduces the mechanical properties of the material; especially when the crosslinking is insufficient, the corrosion resistance of the material does not improve much. However, the degree of microphase separation is greatly affected, which usually leads to a decrease in the impact resistance of the material and is brittle.
[0004] Conventional polycaprolactone polyols can no longer meet market demand, so it is necessary to develop a polycaprolactone polyol that can improve coating strength, corrosion resistance, high resilience and high gloss

Method used

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  • Preparation method and application of polycaprolactone polyol
  • Preparation method and application of polycaprolactone polyol
  • Preparation method and application of polycaprolactone polyol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Put 120g of hydrogenated bisphenol A and 180g of ε-caprolactone into a 500g four-necked flask equipped with a stirring paddle, a thermometer, and a vacuum receiving tube, heat the reactant to 60°C, reduce the vacuum to 1KPa, and perform dehydration treatment. The dehydration time is 4 hours, and the moisture is detected. After the moisture drops below 300ppm, add 50ppm of stannous octoate to the four-necked flask, replace the air in the flask with nitrogen three times, and raise the temperature of the reaction system to 140°C under the protection of positive nitrogen pressure. , react at this temperature for 8h, take a sample to detect the residual caprolactone, and carry out vacuum distillation after it is less than 1%.

[0040] Wherein the sampling is carried out under the condition of nitrogen gas under positive pressure to prevent the yellowing caused by the entry of oxygen during sampling.

[0041] After 8 hours, the viscosity of the polycaprolactone polyol was 153...

Embodiment 2

[0054] Put 89.9g of hydrogenated bisphenol A and 210.1g of ε-caprolactone into a 500g four-necked flask equipped with a stirring paddle, a thermometer, and a vacuum receiving tube, heat the reactant to 55°C, reduce the vacuum to 1KPa, and perform dehydration Treatment, the dehydration time is 2h, and the moisture is detected. After the moisture drops below 300ppm, 100ppm of stannous octoate is added to the four-necked flask, and after the air in the flask is replaced with nitrogen for three times, the temperature of the reaction system is raised to 180°C, react at this temperature for 6 hours, take a sample to detect the residual caprolactone, if it is less than 1%, carry out vacuum distillation.

[0055] Wherein the sampling is carried out under the condition of nitrogen gas under positive pressure to prevent the yellowing caused by the entry of oxygen during sampling.

[0056] After 8 hours, the viscosity of the polycaprolactone polyol was 189 mpa.s, and the residual caprola...

Embodiment 3

[0069] Put 72g of hydrogenated bisphenol A and 228g of ε-caprolactone in a 500g four-neck flask equipped with a stirring paddle, a thermometer, and a vacuum receiving tube, heat the reactant to 65°C, reduce the vacuum to 2KPa, and perform dehydration treatment. The time is 3 hours, and the moisture is detected. After the moisture drops below 300ppm, 200ppm of stannous octoate is added to the four-necked flask, and the air in the flask is replaced with nitrogen for three times. React at this temperature for 5 hours, take a sample to detect the residual caprolactone, if it is less than 1%, carry out vacuum distillation.

[0070] Wherein the sampling is carried out under the condition of nitrogen gas under positive pressure to prevent the yellowing caused by the entry of oxygen during sampling.

[0071] After 8 hours, the viscosity of the polycaprolactone polyol was 212mpa.s, and the residual caprolactone was 0.94%.

[0072] Keep at 140° C. and a vacuum of 1 KPa for 2 hours to r...

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Abstract

The invention discloses a method for preparing polycaprolactone polyol and application of the polycaprolactone polyol, hydrogenated bisphenol A and epsilon-caprolactone are polymerized, and the prepared polycaprolactone polyol has the characteristics and advantages of low chroma and high reaction activity; the polycaprolactone polyol disclosed by the invention is used as a raw material of the polyurethane-acrylic acid coating, and can improve the solvent resistance, weather resistance, hydrolysis resistance and surface glossiness of the coating.

Description

technical field [0001] The invention relates to the field of organic macromolecular compounds, in particular to a method for preparing a polyol of epoxy resin ring-opened ε-caprolactone and its application. Background technique [0002] Polycaprolactone polyol (PCL) is a kind of aliphatic linear polyester, which has the characteristics of high reactivity, low viscosity, narrow relative molecular weight distribution, low acid value and water content, and is mainly used in polyurethane elastomers, coatings and adhesives and other fields. With the improvement of market requirements, how to improve the strength, corrosion resistance, weather resistance and hydrolysis resistance of polyurethane elastomers, and at the same time improve the surface gloss of materials has become the focus of current technology development. [0003] At present, the commonly used method in the industry to improve the corrosion resistance of polyurethane elastomers and coatings is to use multifunction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G63/85C08G18/42C09D175/06
CPCC08G18/42C08G63/08C08G63/85C09D175/06
Inventor 高伟李镓豪王湘杰陶志豪彭友智彭涛
Owner HUNAN JUREN CHEM NEW MATERIAL TECH CO LTD
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