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A kind of preparation method of curing agent for medium and high temperature damping polyurethane

A polyurethane, medium and high temperature technology, applied in the field of preparation of curing agent for medium and high temperature damping polyurethane, can solve the problems of large damping factor change, low glass transition temperature, unfavorable use, etc., to increase the glass transition temperature and broaden the damping Temperature range, the effect of increasing frictional resistance

Active Publication Date: 2019-12-17
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In traditional research, polyester or polyether oligomers are introduced into polyurethane resins to increase the proportion of flexible segments, thereby improving resin damping properties. Patent 201410699324.9 discloses a polyether polyol that improves polyurethane damping properties, and its The preparation method and the preparation method of the damping material prepared by the invention improve the damping factor and the damping temperature range of the polyurethane material to a certain extent, but its glass transition temperature is low, and the damping factor changes greatly in the damping temperature range. It began to drop significantly, and the damping factor at 50°C was even less than 0.1, which is not conducive to use at higher temperatures
Patent 201310300878. 2 discloses an ether-bonded polyester polyurethane damping material and its preparation method. The polyurethane material obtained in this invention has a high damping factor, but its glass transition temperature is relatively low, and it begins to drop significantly at 30°C. The damping factor is less than 0.2, which is greatly restricted by the environment in practical applications

Method used

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  • A kind of preparation method of curing agent for medium and high temperature damping polyurethane
  • A kind of preparation method of curing agent for medium and high temperature damping polyurethane
  • A kind of preparation method of curing agent for medium and high temperature damping polyurethane

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Experimental program
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Effect test

Embodiment 1

[0028] (1) Dehydration treatment of TDI, diazobisphenol fluorene and trimethylolpropane (dehydration treatment with 5A molecular sieves), and set aside;

[0029] (2) Take 31 parts by weight of dehydrated diisocyanate and 41 parts by weight of xylene in N 2 Add to a dry three-necked flask and mix under atmosphere, stir and heat up to 30°C;

[0030] (3) Dissolve 0.5 parts by weight of dehydration-treated diazobisphenol fluorene and 7.5 parts by weight of dehydration-treated trimethylolpropane in 20 parts by weight of DMF, and add the resulting mixture dropwise to the step through a constant pressure funnel. (2) In the three-necked flask, the temperature was raised to 70°C, and the temperature was kept for 1.5 hours;

[0031] (4) Take a sample of the reaction product in step (3), use the acetone-di-n-butylamine method to detect its NCO content, calculate and titrate the NCO content until it is close to the theoretical value, and then discharge the product, and test the NCO conte...

Embodiment 2

[0033] (1) Dehydration treatment of IPDI, diazobisphenol fluorene and trimethylolpropane (dehydration treatment with 5A molecular sieves), and set aside;

[0034] (2) Take 31 parts by weight of dehydrated diisocyanate and 41 parts by weight of butyl acetate in N 2 Add to a dry three-necked flask and mix under atmosphere, stir and heat up to 50°C;

[0035] (3) Dissolve 1 part by weight of dehydration-treated diazobisphenol fluorene and 7 parts by weight of dehydration-treated trimethylolpropane in 20 parts by weight of cyclohexanone, and add the resulting mixture dropwise through a constant pressure funnel into the three-neck flask described in step (2), then raise the temperature to 90°C, and keep the temperature for 1.5h;

[0036] (4) Take a sample of the reaction product in step (3), use the toluene-di-n-butylamine method to detect its NCO content, calculate and titrate the NCO content until it is close to the theoretical value, and then discharge the product, and test the ...

Embodiment 3

[0038] (1) Dehydrate MDI, diazobisphenol fluorene, and trimethylolpropane (dry in vacuum at 60°C), and set aside;

[0039] (2) Take 31 parts by weight of dehydrated diisocyanate and 41 parts by weight of acetone in N 2 Add to a dry three-necked flask and mix under atmosphere, stir and heat up to 40°C;

[0040] (3) Dissolve 1.5 parts by weight of dehydration-treated diazobisphenol fluorene and 6.5 parts by weight of dehydration-treated trimethylolpropane in 20 parts by weight of DMSO, and add the resulting mixture dropwise to the step through a constant pressure funnel. (2) In the three-necked flask, the temperature was raised to 80°C, and the temperature was kept for 1.5 hours;

[0041] (4) Take a sample of the reaction product in step (3), use the N,N-dimethylformamide-di-n-butylamine method to detect its NCO content, calculate and titrate the NCO content, discharge until it is close to the theoretical value, and test again For the NCO content of the product, the product wa...

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Abstract

The invention discloses a preparation method of a curing agent for high temperature damping polyurethane. The dinitrogen bisfluorene in the structure comprises a special large spatial configuration; the spatial configuration, as a side chain of a polymer, can strengthen the friction steric hindrance between molecular chains, meanwhile, the fused heterocycle structure containing pyridine and the like is utilized to improve the proportion of a rigid segment of polyurethane, so that the damping performance of a polyurethane material in the high temperature environment and the stability of the damping performance are improved. The prepared curing agent is applied to the curing of a polyurethane resin, compared with the traditional curing agent, the curing agent increases the glass transition temperature of the polyurethane material and the damping factor at the medium-high temperature, expands the damping temperature range of the material, and improves the damping performance of the material in the medium-high temperature environment.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and in particular relates to a preparation method of a curing agent for medium-high temperature damping polyurethane. Background technique [0002] Polyurethane resin has the characteristics of high elasticity, wear resistance, solvent resistance, and low temperature resistance, and plays an important role in solving the problem of vibration and noise reduction. With the development of today's society, people have higher and higher requirements for the comfort of the environment in the field of production and life. Excessive noise in the cabin or work cabin of the vehicle will affect the customer experience and the work efficiency of the staff. In the traditional research field of polyurethane vibration and noise reduction performance, the damping performance of materials is mainly improved by increasing the proportion of polyurethane flexible segments. However, the introduction of fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/32C08G18/38C08G18/75C08G18/76
CPCC08G18/3206C08G18/3844C08G18/755C08G18/7614C08G18/7671
Inventor 邵艳群周绍令梁宇
Owner FUZHOU UNIV
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