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Hybrid TPU capable of quickly crystallizing and having low refractive index and preparation method of hybrid TPU

A technology of refractive index and hybridization, which is applied in the field of polyurethane, can solve the problems of reducing visual acuity, color contrast, visual clarity and visual comfort, affecting driving sight, and potential safety hazards, so as to increase visual acuity and improve crystallization The effect of increasing the speed and increasing the difficulty of processing

Pending Publication Date: 2022-02-15
尼伦化学(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally, the reflectivity of the front windshield of a car is 1.3 to 1.4. As a front windshield or glass laminated film, the refractive index of TPU ranges from 1.51 to 1.57, which is much higher than the reflectivity of the glass, which will cause various problems in the front of the car. Harmful light such as glare, stray light, refracted light, reflected light, and scattered light is difficult to filter out, which reduces visual acuity, color contrast, visual clarity, and visual comfort, and increases fatigue caused by long-term driving; , when driving at night, the image of the instrument panel will also be reflected on the front windshield or rearview mirror, affecting the driving line of sight and posing a safety hazard

Method used

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  • Hybrid TPU capable of quickly crystallizing and having low refractive index and preparation method of hybrid TPU
  • Hybrid TPU capable of quickly crystallizing and having low refractive index and preparation method of hybrid TPU
  • Hybrid TPU capable of quickly crystallizing and having low refractive index and preparation method of hybrid TPU

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preparation example Construction

[0027] A kind of preparation method of above-mentioned hybrid TPU composition that can crystallize rapidly, low refractive index, also comprise the following steps:

[0028] (1) According to the method described in patent CN107417973B, the surface of hollow silica nanospheres is modified with higher carbon alcohol;

[0029] (2) Add isocyanate (MDI) and hollow silica nano-microspheres, catalyst to the reactor under nitrogen protection and heating to prepare hollow silica microsphere hybrid TPU prepolymer, the mass fraction of isocyanate is 28-35%; the mass fraction of the hollow silica microspheres is 4-6%; 2-4 drops of the catalyst are dripped with a straw; the heating temperature is preferably 85-95°C; The specific structure of TPU hybridized with silicon nanospheres is:

[0030]

[0031] Under nitrogen protection and continuous heating, and continuous stirring, continue to add polyether or polyester diol, 1,4-butanediol to step (2), and react for 24 to 36 hours to prepar...

Embodiment 1

[0050] Embodiment 1 preparation method is as follows:

[0051] (1) According to the method described in patent CN 107417973 B, the surface of hollow silica nanospheres is modified with higher carbon alcohol;

[0052] (2) Add 27.5wt% isocyanate (MDI) and 2.8wt% hollow silica nanospheres, 0.3% dibutyltin dilaurate and triethylamine to the reactor under nitrogen protection and heating (85-95°C) Catalyst to prepare hollow silica microsphere hybrid TPU;

[0053] (3) Under nitrogen protection and continued heating (85-95° C.), and with continuous stirring, continue to add 65 wt % of polyether diol (PTMEG3000), 5.8 wt % of 1,4-butane to step (2) The diol is reacted for 24-36 hours to prepare TPU with excess NCO, and the mole number of the isocyanate group is equivalent to the total number of moles of higher carbon alcohol, polyether or polyester diol, and 1,4-butanediol.

[0054] Table 1:

[0055]

[0056] MDI: diphenylmethane diisocyanate, Wanhua Chemical;

[0057] PTMEG3000:...

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Abstract

The invention discloses hybrid TPU capable of quickly crystallizing and having a low refractive index and a preparation method of the hybrid TPU. The preparation method comprises the steps: (1) preparing hollow silicon dioxide nano-microspheres with high alcohol modified on the surfaces; and (2) adding isocyanate (MDI), the hollow silicon dioxide nano-microspheres and a catalyst into a reactor under the protection of nitrogen and heating to prepare a hollow silicon dioxide microsphere hybridized TPU prepolymer, wherein the mass fraction of the isocyanate is 20-60%. The refractive index of the TPU is reduced to about 1.45, and the TPU has low refractive index, can filter various glare, stray light, refracted light, reflected light, scattered light and the like in front of an automobile when being applied to an automobile strong windshield, and reduces the fatigue feeling caused by long-time driving; and in addition, the hollow silicon dioxide nano-microspheres have surface crystallizable and plasticizable properties, so that the processing difficulty of the polymer is not increased, the crystallization rate of the polymer is improved, the forming time of the product is shortened, and the processing and manufacturing cost can be saved.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, and specifically relates to a hybrid TPU capable of rapid crystallization and low refractive index and a preparation method thereof. Background technique [0002] As one of the basic optical parameters of a material, the refractive index of a material is used to measure the propagation speed of light in a medium relative to that in air. Since the two media have different refractive indices, when the light propagates in the two media, the propagation speed will change, and this change will be received by human eyes or photodetectors in the form of optical interference. [0003] Generally, the reflectivity of the front windshield of a car is 1.3 to 1.4. As a front windshield or glass laminated film, the refractive index of TPU ranges from 1.51 to 1.57, which is much higher than the reflectivity of the glass, which will cause various problems in the front of the car. Harmful light such as glar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/32C08G18/10
CPCC08G18/3895C08G18/664C08G18/6674C08G18/4854C08G18/4277C08G18/3206C08G18/10
Inventor 周小三邹松
Owner 尼伦化学(上海)有限公司
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