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A kind of polyurethane prepolymer and its preparation method and ultraviolet light curing polyurethane prepolymer composition

A polyurethane prepolymer and compound technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of production, negative impact on users, affecting the overall performance of coatings, and diluents that cannot be cured, etc., to achieve process optimization and human body The effect of stimulating green environmental protection and mild reaction conditions

Active Publication Date: 2019-10-15
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthetic monomers of traditional polyurethane prepolymers are mostly isocyanate and polyol, and isocyanate is highly toxic, which has a relatively large negative impact on the environment, production and users
Moreover, for the convenience of construction, polyurethane coatings usually contain more low-molecular-weight reactive diluents, which will cause skin allergies or discomfort, especially when used on some porous materials, the diluents are easy to enter the pores and cannot be cured. This will cause the object to be coated to have a long-term odor, and the presence of diluent will also greatly affect the overall performance of the coating

Method used

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  • A kind of polyurethane prepolymer and its preparation method and ultraviolet light curing polyurethane prepolymer composition
  • A kind of polyurethane prepolymer and its preparation method and ultraviolet light curing polyurethane prepolymer composition
  • A kind of polyurethane prepolymer and its preparation method and ultraviolet light curing polyurethane prepolymer composition

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preparation example Construction

[0048] The present invention also provides a kind of preparation method of above-mentioned polyurethane prepolymer, comprising:

[0049] a) under the inert gas helium or argon, react the cyclocarbonate compound and the amine compound under the action of a catalyst at 50-150° C. for 5-48 hours to obtain the first reaction intermediate;

[0050] b) reacting the first reaction intermediate obtained in step a) and the acrylic compound at 100-120° C. for 2.5-3 hours in the presence of a polymerization inhibitor to obtain the polyurethane prepolymer;

[0051]Among them, the molar ratio of the cyclic carbonate compound, the amine compound and the acrylic compound is preferably (1-3):1:(2-3).

[0052] The cyclic carbonate compound in step a) is preferably ethylene carbonate, 1-methoxy-ethylene carbonate or propylene carbonate, more preferably propylene carbonate. The amine compound is preferably N-(2-hydroxyethyl)ethylenediamine, diamine or triamine, wherein the diamine is preferably...

Embodiment 1

[0060] Nitrogen was passed into the four-necked flask with a stirrer and a thermometer to remove the air in the system, and after slowly raising the temperature to 150°C, 204.18g of propylene carbonate (PC) and 0.02g of cesium carbonate catalyst were added and stirred evenly, and then slowly Add 170.03 g of isophorone diamine dropwise, and keep the reaction for 5 hours to obtain a reaction intermediate. When the temperature of the above reaction system was lowered to 120°C, 284.3 g of glycidyl methacrylate containing 0.028 g of p-hydroxyanisole was slowly added dropwise to the system, stirred at constant temperature for 3 h, and then distilled under reduced pressure for 1.5 h to remove unreacted mono body, a light yellow polyurethane prepolymer was obtained, and its H NMR spectrum was as figure 1 shown.

[0061] Finally, the reaction system was cooled to 70° C., and 0.071 g of 2-isopropylthioxanthone and 0.08 g of phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide were added....

Embodiment 2

[0063] Nitrogen was passed into the three-necked flask with a stirrer and a thermometer to remove the air in the system, and the temperature was slowly raised to 50°C, then 1mol of PC and 0.014g of cesium carbonate catalyst were added and stirred evenly, and then 0.43mol of isofor was slowly added dropwise. Erketone diamine and 0.6mol of D-400 were incubated for 48 hours to obtain a reaction intermediate. Then, after the temperature of the reaction system was raised to 100° C., 1 mol of glycidyl methacrylate containing 0.025 g of hydroquinone was slowly added dropwise to the system, and stirred at constant temperature for 3 hours to obtain a light yellow polyurethane prepolymer.

[0064] Finally, the reaction system was cooled to 40°C, 0.23g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide was added, stirred at high speed for 5 minutes under dark conditions, and then stirred at low speed for 10 minutes to obtain a Transparent low viscosity UV curable polyurethane prepolymer...

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Abstract

The invention provides a polyurethane prepolymer which is novel environment-friendly non-isocyanate polyurethane, does not contain an isocyanate group with high toxicity and high moisture sensitivity, has no pollution to the environment and has no damages to human health. A preparation method provided by the invention has a simple operation process; a technology is optimized and raw materials are readily available; and the reaction selectivity is high and a preparation process is safe and clean. A low-viscosity ultraviolet-cured composition can be obtained through mixing the polyurethane prepolymer provided by the invention with a photoinitiator; a system does not contain any active diluting agent and is not retracted and deformed in a curing process; the low-viscosity ultraviolet-cured composition can be widely used for preparing ultraviolet-cured polyurethane coating, 3D (Three Dimensional) printing photosensitive resin, ultraviolet-cured polyurethane ink or an ultraviolet-cured polyurethane adhesive which has low viscosity, does not contain the active diluting agent, has small irritation to human bodies and is green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of ultraviolet light-curable polyurethane prepolymer, and in particular relates to a polyurethane prepolymer, a preparation method thereof and an ultraviolet light-curable polyurethane prepolymer composition. Background technique [0002] UV curing is an advanced technology for rapid surface treatment that appeared in the 1970s. It is collectively referred to as radiation curing together with electron beam curing. By using ultraviolet light to trigger rapid cross-linking and polymerization of chemically active liquid materials, they can instantly become solid materials, which is an efficient, environmentally friendly and energy-saving surface treatment technology. Common UV-curable polyurethane products are UV coatings, UV inks and UV adhesives. The biggest feature of them is the fast curing rate, which generally achieves curing within a few seconds to tens of seconds. UV coating is an important and widely ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G71/04C09D175/14
Inventor 易国斌宋旭亮俎喜红钟亚洲刘潇杰安召
Owner GUANGDONG UNIV OF TECH
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