Method for preparing 3,3'-dimethyl-4,4'-biphenyl diisocyanate (TODI)-based thermoplastic polyurethane elastomer

A thermoplastic polyurethane and elastic technology, applied in the field of polyurethane, can solve the problems of butanediol volatilization, continuous metering of solid TODI and other problems, and achieve the effects of avoiding volatilization of adding materials, easy operation and low mixing temperature

Active Publication Date: 2011-09-14
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, butanediol volatilizes seriously at a temperature of 150°C. If it is used in industrial continuous production, it will also bring great difficulties to the continuous measurement of solid TODI.

Method used

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  • Method for preparing 3,3'-dimethyl-4,4'-biphenyl diisocyanate (TODI)-based thermoplastic polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Dehydrate 300g of PCL (PCL-2000) with a number-average molecular weight of 2000 at 100-120°C and vacuum degree of -0.098--0.01MPa for 2h, add 173.7g of TODI, and react at a temperature of 110-120°C for 1h , to obtain a storage-stable prepolymer (component A) with an NCO mass fraction of 9.0%.

[0031] (2) 28.7g PCL-2000, 4.8g 1,4-butanediol, 0.008g catalyst bismuth isooctanoate, 0.1g antioxidant Irgastab PUR68, 0.3g ultraviolet absorber Tinuvin213 and 0.2g light stabilizer UV- 765 mix well (component B), keep the temperature at 60°C, and mix with 66g component A (80°C), where the molar ratio R of NCO groups to OH groups in PCL-2000 and 1,4-BDO is 1.02:1.

[0032] (3) Pour the mixture into a mold at 180° C. for 15 minutes after vacuum defoaming, and release it from the mold. Put the semi-finished product after demolding into an oven at 120° C. and mature it for 24 hours to obtain the finished product. The main performance indicators are shown in Table 2.

Embodiment 2

[0034] (1) Dehydrate 300g of PCL (PCL-1000) with a number-average molecular weight of 1000 at 100-120°C and a vacuum of -0.098--0.01MPa for 2h, add 230g of TODI, and react at a temperature of 95-110°C for 1h, A storage-stable prepolymer (component A) with an NCO mass fraction of 9.0% was produced.

[0035] (2) 22.5g PCL-1000, 1.4g ethylene glycol, 0.004g catalyst bismuth isooctanoate, 0.3g antioxidant Irgastab PUR68, 0.2g ultraviolet absorber Tinuvin213 and 0.5g light stabilizer UV-765 are mixed in proportion Homogeneous (component B), keep the temperature at 60°C, and mix with 75.5g component A (80°C), where the molar ratio R of NCO groups to OH groups in PCL-2000 and ethylene glycol is 1.02:1 .

[0036] (3) After vacuum defoaming, the mixture is poured into a mold at 160°C for 15 minutes for demoulding, and the semi-finished product after demolding is placed in an oven at 100°C for 24 hours to obtain the finished product. The main performance indicators are shown in Table ...

Embodiment 3

[0038] (1) Dehydrate 300g of PTMG (PTMG-2000) with a number-average molecular weight of 2000 at 100-120°C and a vacuum of -0.098--0.01MPa for 2h, add 260g of TODI, and react at a temperature of 95-100°C for 1h, A storage-stable prepolymer (component A) with an NCO mass fraction of 12.3% was produced.

[0039] (2) 26.0g PTMG-2000, 7.4g 1,4-butanediol, 0.002g catalyst bismuth carboxylate, 0.3g antioxidant Irgastab PUR68, 0.2g ultraviolet absorber Tinuvin571 and 0.5g light stabilizer UV- 765 (component B) mix well, keep the temperature at 55°C, and mix with 66g component A (70°C), where the molar ratio of NCO group to OH group in PCL-2000 and 1,4-butanediol is R It is 0.98:1.

[0040] (3) Pour the mixture into a mold at 160°C for 15 minutes for demoulding after vacuum defoaming, and place the semi-finished product after demoulding in an oven at 110°C for aging for 20 hours to obtain the finished product. The main performance indicators are shown in Table 2.

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Abstract

The invention discloses a method for preparing a 3,3'-dimethyl-4,4'-biphenyl diisocyanate (TODI)-based thermoplastic polyurethane elastomer. The method comprises the following steps of: (1) adding dehydrated macromolecular diol into TODI, and reacting for 1 hour at the temperature of between 95 and 120 DEG C to generate a prepolymer component A containing 8.0 to 14.0 percent of isocyanate group (NCO); (2) mixing macromolecular diol, chain extender and other auxiliary agents uniformly, keeping the temperature at 40 to 60 DEG C, and mixing the mixture and the component A at the temperature of between 60 and 90 DEG C, wherein the molar ratio of the NCO to the OH group is 0.95:1-1.10:1; and (3) pouring the bubble removed mixture into a die of 160 to 180 DEG C, stirring in 15 to 20 minutes, and curing the stripped semi-finished product for 20 to 24 hours at the temperature of between 100 and 120 DEG C to obtain a finished product. The viscosity difference of the component A and the component B is low in the method, the component A and the component B are easily combined, and the performance of the product can be regulated by regulating the proportion of the macromolecular diol and the small molecular chain extender in the component B.

Description

technical field [0001] The invention belongs to the field of polyurethane, in particular to a preparation method of TODI-based thermoplastic polyurethane elastomer. Background technique [0002] Polyurethane elastomers are widely used in mechanical hydraulic transmission systems, seals in pneumatic systems and automotive seals because of their wide hardness range, good mechanical properties, resilience properties, wear resistance, oil resistance, and aging resistance. In some special fields, there will be more stringent requirements for seals: such as higher mechanical strength, better high temperature resistance, oil resistance and wear resistance, good dynamic mechanical properties, etc. [0003] 3,3'-Dimethyl-4,4'-biphenyl diisocyanate (TODI) molecule has low activity due to the steric hindrance effect and electronic effect of the ortho-position side methyl group, and the prepared prepolymer has good stability Sex, and the two benzene rings are directly connected, with a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/65C08G18/66C08G18/10C08L75/04C08L75/06C08L75/08
Inventor 石雅琳苏丽丽韦永继姚庆伦张永
Owner LIMING RES INST OF CHEM IND
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