A stable NCO prepolymer, a preparing method thereof and use of the prepolymer

A prepolymer and stable technology, which is applied in the field of stable NCO prepolymer and its preparation, can solve the problems of limited storage time, high NDI activity, and difficulty in storage of prepolymer.

Inactive Publication Date: 2016-08-10
苏州绿朗工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high activity of NDI, the preservation of its prepolymer is very difficult and almost impossible. A lot of research work shows that its prepolymer can only be stored at 130 ° C for half an hour, and at 100 ° C The time is also very limited, no more than 1 day

Method used

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  • A stable NCO prepolymer, a preparing method thereof and use of the prepolymer
  • A stable NCO prepolymer, a preparing method thereof and use of the prepolymer
  • A stable NCO prepolymer, a preparing method thereof and use of the prepolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 332g of 1,5-naphthalene diisocyanate (NDI) was heated to 130°C to become a clear liquid, then 77g of cetyl alcohol was added for capping, and stirred for 30 minutes; 1000g of poly-ε-caprolactone polyol (PCL ) to 80°C to 100°C, add 50g of polyethylene wax, stir evenly with a high-speed mixer, the stirring speed is higher than 1000r / min, and stir for 20 to 40 minutes; control the speed by a metering pump, and poly-ε-caprolactone The mixture of polyol (PCL) and polyethylene wax is added to the mixture of NDI and cetyl alcohol at one time, and then stirred at high speed with a high-speed mixer, the stirring speed is higher than 2000r / min, and the stirring time is shorter than 10 minutes. After the stirring is completed Keep the temperature of the mixed solution at 90-120°C, then pour the mixed solution into containers and pack it for storage.

[0032] After the prepolymer was divided into several groups of samples, the samples were tested at different storage temperatures. ...

Embodiment 2

[0036] Heat the prepolymer in Example 1 to 120°C, and after degassing, mix it with 75g of 1,4-butanediol for chain extension, then pour it into a mold coated with a release agent, and then put it into a 130 Cure in a blast oven at ℃ for 2 hours and then release the mold, and then put it in the oven for 20 hours and then take it out to test its performance.

[0037] The performance test result of each test sample in table 2 embodiment 2

[0038]

Embodiment 3

[0040] 332g of 1,5-naphthalene diisocyanate (NDI) was heated to 130°C to become a clear liquid, then 77g of cetyl alcohol was added for capping, and stirred for 30 minutes; 1000g of poly-ε-caprolactone polyol ( PCL) is heated to 80°C-100°C, adding polyethylene wax of different weights, stirring evenly with a high-speed mixer, the stirring speed is higher than 1000r / min, and stirring for 20-40 minutes; the speed is controlled by a metering pump, and the poly-ε-hexyl The mixture of lactone polyol (PCL) and polyethylene wax is added to the mixture of NDI and cetyl alcohol at one time, and then stirred at a high speed with a high-speed mixer, the stirring speed is higher than 2000r / min, and the stirring time is shorter than 10 minutes. After completion, the temperature of the mixed solution is 90-120° C., and then the mixed solution is poured into containers and packaged for storage.

[0041] After the prepolymer is divided into several groups of samples, the samples are tested at...

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Abstract

The present invention relates to a stable NCO prepolymer and its preparation method and application. The content of NCO in the prepolymer is 1.2~30wt.%, the viscosity at 110°C is less than 4500mPa.s, and at least one kind of Between ~8000g/mol, a mixture of polyols and waxes with a functionality of 1.95 to 3.15, the polyols are selected from polyester polyols, poly‑ε‑caprolactone polyols, polycarbonate polyols, polyether polyols and polyols Tetrahydrofuran ether diol; and the reaction product of 1,5-naphthalene diisocyanate and the blocking agent mixture, the molar ratio of 1,5-naphthalene diisocyanate and the blocking agent is 1:0.1~0.4. The prepolymer of the present invention is stable and uniform, can form a stable and transparent melt, and can have suitable viscosity at processing temperature.

Description

technical field [0001] The invention relates to an NCO prepolymer, in particular to a stable NCO prepolymer and its preparation method and application. Background technique [0002] Prepolymers are NCO group-terminated prepolymers obtained by reacting polyols with isocyanates in molar excess based on functional groups at room temperature to about 100°C (in special cases also higher than 100°C) until the NCO value reaches a constant value . An important application of such NCO-terminated prepolymers is the preparation of elastomers by casting. In preparing such elastomers, the prepolymer is chain-extended (i.e., reacted with short-chain polyols such as propylene glycol or with polyamines such as methylene bis(o-chloroaniline) or water) immediately after preparation. , or the NCO prepolymer is cooled (to the extent favorable and feasible) to a lower temperature (storage temperature) for subsequent chain extension and stored. In principle, casting elastomers can be obtained ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/80C08G18/32C08G18/42C08G18/66
CPCC08G18/8064C08G18/3206C08G18/4277C08G18/664
Inventor 朱勇健
Owner 苏州绿朗工程技术有限公司
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