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Composition as well as preparation method and application thereof to force-induced discoloration material field

A composition and raw material technology, applied in the field of mechanochromic materials, the composition and its preparation field, can solve the problems of insensitive discoloration, poor responsiveness to stress, etc., and achieve excellent tensile performance indicators, good tensile strength, The effect of obvious color change

Active Publication Date: 2018-08-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a composition and its preparation method and its application in the field of mechanochromic materials, which are used to solve the problems of poor force response and insensitivity of discoloration in polyurethane-based mechanochromic materials in the prior art defect

Method used

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  • Composition as well as preparation method and application thereof to force-induced discoloration material field
  • Composition as well as preparation method and application thereof to force-induced discoloration material field
  • Composition as well as preparation method and application thereof to force-induced discoloration material field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The first prepolymerization reaction: Mix 0.01mol dihydroxyspiropyran 1, 0.32mol diisocyanate 1a and 0.03mol organic amine catalyst 1a, heat in 40ml dry tetrahydrofuran solution at 60°C for 2.5h, and get First product 1. Among them, the dihydroxy spiropyran 1 is the R group is -CH 3 The spiropyran, the diisocyanate 1a is toluene diisocyanate, and the organic amine catalyst 1a is 1,4-diazabicyclo[2.2.2]octane.

[0041] The second prepolymerization reaction: Add 1 mol of polyol 1 to the system that produces the first product 1 while removing tetrahydrofuran, then add 0.006 mol of organic amine catalyst 1b and 2.5 mol of diisocyanate 1b in sequence, and heat at 70°C for 4 hours , the second product 1 was obtained after the reaction. Wherein, the polyol 1 is polycaprolactone diol, the organic amine catalyst 1b is triethylamine, and the diisocyanate 1b is hexamethylene diisocyanate.

[0042] Chain extension reaction: add 1.1 mol of chain extender 1 to the system that prod...

Embodiment 2

[0047] The first prepolymerization reaction: mix 0.005mol of dihydroxyspiropyran 2, 0.21mol of diisocyanate 2a and 0.024mol of organic amine catalyst 2a, heat in 40ml of dry tetrahydrofuran solution at 50°C for 0.5h, and obtain First product 2. Among them, the dihydroxy spiropyran 2 is the R group is -C 2 h 5 The spiropyran, the diisocyanate 2a is p-phenylene diisocyanate, and the organic amine catalyst 2a is bis(dimethylaminoethyl) ether.

[0048] The second prepolymerization reaction: Add 1 mol of polyol 2 to the system that produces the first product 2 while removing tetrahydrofuran, then add 0.007 mol of organic amine catalyst 2b and 3.2 mol of diisocyanate 2b in sequence, and heat at 80°C for 2 hours , the second product 2 was obtained after the reaction. Wherein, the polyol 2 is polybutylene adipate diol, the organic amine catalyst 2 is bis(dimethylaminoethyl) ether, and the diisocyanate 2b is isophorone diisocyanate.

[0049] Chain extension reaction: add 1.65 mol o...

Embodiment 3

[0054] The first prepolymerization reaction: Mix 0.008mol of dihydroxyspiropyran 3, 0.34mol of diisocyanate 3a and 0.035mol of organic amine catalyst 3a, heat in 40ml of dry tetrahydrofuran solution at 75°C for 2 hours, and obtain the first A product3. Among them, the dihydroxy spiropyran 3 is a spiropyran whose R group is a phenyl group, the diisocyanate 3a is diphenylmethane diisocyanate, and the organic amine catalyst 3a is N,N-dimethylcyclohexylamine.

[0055] The second prepolymerization reaction: Add 1 mol of polyol 3 to the system that produces the first product 3 while removing tetrahydrofuran, then add 0.005 mol of organic amine catalyst 3b and 4.3 mol of diisocyanate 3b in sequence, and heat at 100°C for 3 hours , the second product 3 was obtained after the reaction. Among them, the polyol 3 is polyethylene adipate diol, the organic amine catalyst 3b is N,N,N',N'-tetramethylalkylene diamine, and the diisocyanate 3b is dicyclohexylmethane diisocyanate.

[0056] Cha...

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Abstract

The invention belongs to the technical field of functional polyurethane materials and in particular relates to a composition as well as a preparation method and application thereof to a force-induceddiscoloration material field. The invention provides the composition and the composition is prepared from the following raw materials: dihydroxyspiropyran, polyol, an organic amine type catalyst, diisocyanate, a chain extender and a crosslinking agent. The invention further provides the preparation method of the composition and also provides the application of the composition or a product obtainedby the preparation method to the force-induced discoloration material field. tensile experimental determination can show that color changes of the product prepared by the technical scheme are remarkable before and after stretching; meanwhile, the composition has good tensile strength and the tensile performance index is better than that of a reference substance. According to the composition as well as the preparation method and the application thereof to the force-induced discoloration material field, provided by the invention, the technical defects of a polyurethane based force-induced discoloration material in the prior art of poor force responsiveness and insensitive discoloration are solved.

Description

technical field [0001] The invention belongs to the technical field of functional polyurethane materials, and in particular relates to a composition, a preparation method thereof and an application in the field of mechanochromic materials. Background technique [0002] Mechanochromic materials refer to a class of intelligent materials that can realize color changes under the action of external forces, and are one of the important research fields in recent years. Mechanochromic materials use mechanical force as a source of stimulation. When subjected to external force, they can change their color to show the magnitude and position of the force. has potential application prospects. [0003] Traditional mechanochromic materials mainly achieve force responsiveness by changing the aggregated morphology of the material, which is not obvious, and the scope of application is quite limited. In recent years, organic mechanochromic materials with good force-responsiveness have been p...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/32C08G18/42C08G18/66C08G18/48C08G18/44C08L75/04C08L75/06C08L75/08
CPCC08G18/12C08G18/3844C08G18/4018C08G18/4238C08G18/4277C08G18/44C08G18/4825C08G18/4833C08L75/04C08L75/06C08L75/08C08G18/3206
Inventor 廖正福韩栋汪冬杨迅谢丽纯
Owner GUANGDONG UNIV OF TECH
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