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A kind of method for preparing polyurethane-polyisocyanurate film gradient material

A technology of polyisocyanurate and gradient materials, which is applied in the field of preparing polyurethane-polyisocyanurate film gradient materials, can solve the problems of inability to change the elastic modulus and inability to eliminate the viscoelasticity of the rubber-plastic transition region, and achieve Good thermal stability and dielectric properties, the effect of extending the performance range

Active Publication Date: 2018-05-18
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The polymer gradient materials prepared by existing methods cannot change the elastic modulus in a wide range, and cannot eliminate the viscoelasticity in the rubber-to-plastic transition region

Method used

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  • A kind of method for preparing polyurethane-polyisocyanurate film gradient material
  • A kind of method for preparing polyurethane-polyisocyanurate film gradient material
  • A kind of method for preparing polyurethane-polyisocyanurate film gradient material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Add 85.00g (0.05mol) of tetrahydrofuran-propylene oxide copolyether diol (PF-OP-151700) into a 500ml three-necked flask, stir and raise the temperature to 105°C, dehydrate in vacuum at -0.1MPa for 2h, wait until the temperature drops to At about 60°C, add 17.40g (0.1mol) of 2,4-toluene diisocyanate (2,4-TDI) into the three-necked flask, after natural reaction for 40min, slowly raise the temperature to 80°C to continue the reaction for 1h, add 0.05g (0.05wt% of tetrahydrofuran-propylene oxide copolyether glycol quality) dibutyltin dilaurate catalyst continued to react for 1.5 hours, and then obtained 102.4g terminal NCO-based polyurethane prepolymers to above-mentioned mixed system vacuum defoaming;

[0034] Add the anhydrous acetone of 81.92g (80wt%) in the above-mentioned prepolymer and fully stir to reduce the viscosity of the system, then add 1.54g (1.5%) of the Sudan Blue G catalyst in the presence of cyclotrimerization, and this process time is 2 hours , so that a p...

Embodiment 2

[0038] Add 85.00g (0.05mol) of tetrahydrofuran-propylene oxide copolyether diol (PF-OP-151700) into a 500ml three-necked flask, stir and heat up to 100°C, vacuum dehydrate at -0.3MPa for 2h, wait until the temperature drops to At about 50°C, add 17.40g (0.1mol) of 2,4-toluene diisocyanate (2,4-TDI) into the three-necked flask, after natural reaction for 40min, slowly raise the temperature to 85°C to continue the reaction for 1h, add 0.05g (0.05wt%) dibutyltin dilaurate catalyst continued to react for 1.5 hours, and then the above-mentioned mixed system was vacuumed and defoamed to obtain the NCO-terminated polyurethane prepolymer.

[0039] Add 81.92g (80wt%) of anhydrous acetone in the above-mentioned prepolymer and fully stir to reduce the viscosity of the system, then add 5.12g (5wt% of the prepolymer quality) 2,4-TDI, add 1.62g ( The Sudan Blue G of 1.5%), cyclotrimerization reaction takes place in the presence of catalyst, and this process time is 2 hours, pours again on a...

Embodiment 3

[0043] Add 85.00g (0.05mol) of tetrahydrofuran-propylene oxide copolyether diol (PF-OP-151700) into a 500ml three-necked flask, stir and raise the temperature to 105°C, dehydrate in vacuum at -0.1MPa for 2h, wait until the temperature drops to At about 55°C, add 17.40g (0.1mol) of 2,4-toluene diisocyanate (2,4-TDI) into the three-necked flask, after natural reaction for 40min, slowly raise the temperature to 80°C to continue the reaction for 1h, add 0.1g (0.1wt%) dibutyltin dilaurate catalyst continued to react for 2 hours, and then vacuumize and defoam the above mixed system to obtain NCO-terminated polyurethane prepolymer.

[0044] Add 61.44g (60wt%) of anhydrous acetone in the above-mentioned prepolymer and fully stir to reduce the viscosity of the system, then add 10.24g (10wt% of the prepolymer quality) 2,4-TDI, add 1.72g ( 1.5%) of Sudan Blue G, the system undergoes a cyclotrimerization reaction in the presence of a catalyst. This process takes 1 hour, and then cast on a...

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Abstract

The invention discloses a preparation method of a polyurethane-polyisocyanurate thin-film graded material. The preparation method comprises the steps that aromatic diisocyanate and oligomer diol are used as raw materials, organic tin and Sudan blue are used as catalysts, a polyurethane-polyisocyanurate cross-linked network is prepared through urethane forming reaction and polycyclic trimerization reaction, and then a solution containing a reactor and the catalysts is poured into a hydrophobic mold to obtain a thin film through curing. Reaction mixture solutions different in proportion are poured onto a horizontal polycyclic surface, so that one surface of the prepared graded thin film is higher in elasticity modulus, the other surface of the prepared graded thin film is lower in elasticity modulus, the elasticity modulus in the thickness direction of the thin film changes from one surface to the other surface in a graded mode, no interface exists, the gradient change from soft rubber to rigid plastic of the prepared thin film in the thickness direction is presented macroscopically, the shortcomings of the brittleness and fragility of plastic thin films can be overcome, and the problem that the elasticity modulus of the rubber thin film changing with strain change can be also solved.

Description

technical field [0001] The invention relates to a method for preparing a polyurethane-polyisocyanurate film gradient material, which belongs to the field of film material preparation. Background technique [0002] The synthesis and performance research of gradient materials started from metals and alloys. Due to the needs of the development of the aerospace field, Japanese scientists formally proposed the concept of functionally gradient materials in 1984 to solve the problem of space shuttle engine combustors. One side of the wall must withstand a high temperature greater than 2000 ° C, and the other side must withstand the problem of ultra-low temperature liquid hydrogen cooling. The basic idea of ​​functionally graded materials is to select two materials with different properties according to the specific use requirements, and continuously change the composition, structure or combination form of the two materials to make the internal interface of the composite material di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08G18/48C08G18/10C08G18/18
CPCC08G18/10C08G18/1816C08G18/4825C08G18/4854C08J5/18C08J2375/08
Inventor 李娟张时涛滕卉封雯雅王玲芳丁亮贺盟王成双
Owner YANCHENG INST OF TECH
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