Hybrid diisocyanate polyurethane and preparation method hereof

A technology of diisocyanate and polyurethane, applied in the field of polymer application, can solve the problems of decreased mechanical properties, easy yellowing, cracking, etc., and achieves cost saving, good yellowing resistance, improved adhesion effect and application range. Effect

Inactive Publication Date: 2017-06-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, solvent-based PU resin is used as the basic raw material for the base layer and surface layer in the production process of domestic synthetic leather. However, the commonly used TDI type and MDI type polyurethane are prone to yellowing, cracking, and mechanical performance degradation when used outdoors.

Method used

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  • Hybrid diisocyanate polyurethane and preparation method hereof
  • Hybrid diisocyanate polyurethane and preparation method hereof
  • Hybrid diisocyanate polyurethane and preparation method hereof

Examples

Experimental program
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Effect test

preparation example Construction

[0028] A preparation method for mixing diisocyanate type polyurethane, comprising the following steps:

[0029] (1) Add the polyol into a split-type three-necked reaction flask equipped with a thermometer, a condensing device, and a mechanical stirrer, dehydrate at 100~105°C for 3~4 hours under vacuum conditions, and cool down to 55~65°C;

[0030] (2) the molar ratio of 9-1:1-9

[0031] Aromatic diisocyanate mixed with aliphatic diisocyanate, the amount of mixed diisocyanate and polyol n (-NCO): n (-OH) is 1:1, dissolve the mixed diisocyanate in dried N,N-dimethylformamide (DMF), prepare a DMF solution with a mass concentration of 30-50%, and add it dropwise to the step ( 1) In the system, stir for 1~1.5h at a temperature of 20~25°C;

[0032] (3) Add 0.01%~0.07% catalyst dibutyltin dilaurate (DBTDL) to the reaction system of step (2), the consumption of catalyst is based on the total mass of mixed diisocyanate and polyol, and heat up to 65~70 ℃ for prepolymerization reacti...

Embodiment 1

[0044] A kind of preparation method of mixed diisocyanate type polyurethane, during preparation, take the split type three-necked reaction flask that reflux condenser, mechanical stirring bar, thermometer are equipped with, prepare according to the following steps:

[0045] (1) Add 0.01 mol of polytetrahydrofuran ether glycol 2000 into a split-type three-necked reaction flask equipped with a thermometer, a condensation device, and a mechanical stirrer, dehydrate under 100°C vacuum for 4 hours, and cool down to 60°C;

[0046] (2) Dissolve 0.0072 mol of mixed diisocyanate in the dry N,N-dimethylformamide ( DMF), prepared into a DMF solution with a mass concentration of 50%, added dropwise to the system in step (1), and stirred at a temperature of 25°C for 1 hour;

[0047] (3) Add 0.03% catalyst dibutyltin dilaurate (DBTDL) to the reaction system of step (2), heat up to 70°C for prepolymerization, and keep warm for 2 hours; obtain a polyurethane prepolymer;

[0048] (4) 0.08mol ...

Embodiment 2

[0052] A kind of preparation method of mixed diisocyanate type polyurethane, during preparation, take the split type three-necked reaction flask that reflux condenser, mechanical stirring bar, thermometer are equipped with, prepare according to the following steps:

[0053] (1) Add 0.02 mol of polytetrahydrofuran ether glycol 2000 into a split-type three-necked reaction flask equipped with a thermometer, a condensation device, and a mechanical stirrer, dehydrate under 100°C vacuum for 4 hours, and cool down to 60°C;

[0054] (2) Dissolve 0.0156 mol of mixed diisocyanate with a molar ratio of toluene diisocyanate (TDI) / hexamethylene diisocyanate (HDI) of 3:7 in dried N,N-dimethylformamide (DMF) , prepared into a DMF solution with a mass concentration of 30%, added dropwise to the system of step (1), and stirred at a temperature of 20°C for 1.5h;

[0055] (3) Add 0.06% catalyst dibutyltin dilaurate (DBTDL) to the reaction system of step (2), heat up to 75° C. for prepolymerizati...

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PUM

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Abstract

The invention relates to the technical field of polymer application and particularly relates to anti-yellowing hybrid diisocyanate polyurethane prepared from one part of aromatic isocyanate and aliphatic isocyanate. A preparation method comprises the five steps of mixing selected aromatic diisocyanate and aliphatic diisocyanate at different molar mass ratios to prepare polyurethane; through use of more than two isocyanates, the reaction activity is different, the state of the molecular structure is changed, the quantity of unsaturated double bonds of a benzene ring is reduced, the trend of yellowing of the polymer due to the existence of the unsaturated double bonds and the influences of external factors is reduced, the cost of simply using the aliphatic diisocyanate is reduced from a certain extent, and meanwhile, the requirements of the industrial-grade yellowing resistance are achieved. According to the prepared hybrid diisocyanate polyurethane, the bonding effect and the application range of a product are improved on the premise of ensuring good yellowing resistance of a polyurethane film.

Description

technical field [0001] The invention relates to the technical field of polymer application, in particular to the preparation of a yellowing-resistant mixed diisocyanate polyurethane by using partial aromatic isocyanate and aliphatic isocyanate as raw materials. Background technique [0002] Polyurethane is formed by the reaction of polyisocyanate and polyol to form urethane, which is an important branch of petrochemicals. Due to the strong polar carbamate group, insoluble in non-polar groups, it has good oil resistance, toughness, wear resistance, aging resistance and adhesion. Therefore, polyurethane materials are widely used in the fields of transportation, home appliances, machinery, construction, textiles, shoemaking, sports equipment and venues, agriculture, national defense, etc. in the form of emulsions, resins, and elastomers. It is a multifunctional polymer material. . [0003] At present, solvent-based PU resin is used as the basic raw material for the base layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/44C08G18/48C08G18/10C08G18/32C08G18/76C08G18/73C08G18/75
CPCC08G18/6674C08G18/10C08G18/4238C08G18/4277C08G18/44C08G18/4854C08G18/664C08G18/73C08G18/755C08G18/758C08G18/7621C08G18/7671C08G18/3206
Inventor 任龙芳耿瑾强涛涛
Owner SHAANXI UNIV OF SCI & TECH
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