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Cyclic carbonate group-terminated polyurethane prepolymer and preparation method and application thereof

A technology of polyurethane prepolymer and cyclocarbonate group, which is applied in the field of cyclocarbonate group-terminated polyurethane prepolymer, can solve the problems of high requirements on production equipment safety and process control, difficulty in industrialization, etc., and achieves improved cohesion. The effect of strength and hydrolysis resistance, improved crack resistance, simple preparation process

Inactive Publication Date: 2020-12-01
LANGFANG JINDAO QISHI PLASTIC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of oligomers with cyclocarbonate groups needs to be carried out under high pressure conditions, which requires high safety and process control of production equipment, which brings certain difficulties to industrialization

Method used

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  • Cyclic carbonate group-terminated polyurethane prepolymer and preparation method and application thereof
  • Cyclic carbonate group-terminated polyurethane prepolymer and preparation method and application thereof
  • Cyclic carbonate group-terminated polyurethane prepolymer and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0084] This embodiment provides a polyurethane prepolymer terminated by a cyclocarbonate group, and the polyurethane prepolymer is completely terminated by a cyclocarbonate.

[0085] The preparation process of the polyurethane prepolymer is as follows:

[0086] Step A, heat up the polypropylene oxide ether polyol PPG1000 (average molecular weight 1000, functionality 2) and glycerol carbonate GC in a three-necked flask with stirring for dehydration treatment respectively, and after the temperature of the heated material reaches 110°C, turn on the vacuum pump , keep the vacuum degree above -0.09MPa, remove the water for 2 hours, and seal it for later use after cooling.

[0087] Step B, take another three-necked flask with a capacity of 1 liter, accurately weigh 400g (0.4mol) of PPG1000 after dehydration and put it into the three-necked flask, then add 139.2 grams of toluene diisocyanate TDI-80 (0.8mol), put Heat and stir the reaction in an oil bath at 60°C, pass dry nitrogen pr...

Embodiment 2

[0096] This embodiment provides a polyurethane prepolymer terminated by a cyclocarbonate group, and the polyurethane prepolymer is completely terminated by a cyclocarbonate.

[0097] The preparation process of the polyurethane prepolymer is as follows:

[0098] Step A, heat up and dehydrate polypropylene oxide ether polyol PPG2000 (average molecular weight 2000, functionality 2) and glycerol carbonate GC in a three-necked flask with stirring, and turn on the vacuum pump after the temperature of the heated material reaches 110°C , keep the vacuum degree above -0.09MPa, remove the water for 2 hours, and seal it for later use after cooling.

[0099] Step B, take another 1 liter three-neck flask, put in it accurately weighed 400g (0.2mol) of PPG2000 after dehydration, then add 69.6g of toluene diisocyanate TDI-80 (0.4mol), put it in a 60°C oil bath Heat and stir the reaction in medium temperature, pass through the dry nitrogen protection during the reaction process, raise the tem...

Embodiment 3

[0105] This embodiment provides a polyurethane prepolymer terminated by a cyclocarbonate group, and the polyurethane prepolymer is completely terminated by a cyclocarbonate.

[0106] The preparation process of the polyurethane prepolymer is as follows:

[0107] Step A, heat up the polypropylene oxide ether polyol PPG1000 (average molecular weight 1000, functionality 2) and glycerol carbonate GC in a three-necked flask with stirring for dehydration treatment, heat the material to 120°C, and turn on the vacuum pump , keep the vacuum degree above -0.09MPa, remove the water for 2 hours, and seal it for later use after cooling.

[0108] Step B, take another 1 liter three-neck flask, put in it accurately weighed 400g (0.4mol) of PPG1000 after dehydration, then add 104.4g of toluene diisocyanate TDI-80 (0.6mol), put it in a 60°C oil bath Heat and stir the reaction in medium temperature, pass through the dry nitrogen protection during the reaction process, raise the temperature of the ...

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Abstract

The invention provides a cyclic carbonate group-terminated polyurethane prepolymer and a preparation method and application thereof. The polyurethane prepolymer is completely terminated by a cyclic carbonate group, and the preparation method comprises the following steps: respectively carrying out dehydration treatment on polyol and a sealing agent, mixing polyol and isocyanate, adding a catalyst,stirring to carry out a prepolymerization reaction so as to obtain a polymer with an isocyanate group as an end group, then adding a sealing agent subjected to dehydration treatment to obtain a cyclic carbonate-based terminated polyurethane prepolymer, and finally, adding an active diluent as required to reduce the viscosity of the prepolymer. The polyurethane prepolymer has good flexibility, thecracking resistance, the impact resistance and the binding power of the polyurethane prepolymer are improved when a small amount of the polyurethane prepolymer is added into epoxy resin, the flexibility is improved when a large amount of the polyurethane prepolymer is added, meanwhile, the cohesion strength and the hydrolysis resistance of a cured product are improved, and a small molecular sealing agent cannot be released, no three wastes are generated in the prepolymer preparation process, high temperature and high pressure are not needed, the requirements for safety and process control ofproduction equipment are low, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a cyclocarbonate group-terminated polyurethane prepolymer, a preparation method and an application. Background technique [0002] Epoxy resin is a kind of thermosetting resin with good adhesion, corrosion resistance, insulation, high strength and other properties. It has been widely used in the preparation of adhesives, sealing materials, coatings, composite materials and other materials. It is an indispensable basic material in various industrial fields. The cured product of epoxy resin is usually a three-dimensional network structure with high cross-linking density. It is in a glass state at room temperature. It is generally hard and brittle, with poor cracking and impact resistance. Therefore, it can only be widely used after improving the toughness. The traditional method of improving toughness often uses inactive plasticizers such as dibutyl phthalate and diocty...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/28C08G18/10C08L63/02C08L75/08
CPCC08G18/10C08G18/284C08G18/4808C08G18/4825C08G18/4854C08G18/6666C08G18/6674C08G18/7614C08G18/7671C08L63/00C08L75/08C08G18/2805
Inventor 张炜刘宇星赵世琦
Owner LANGFANG JINDAO QISHI PLASTIC IND CO LTD