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Heat-resistant thermoplastic polyurethane elastomer and preparation method thereof

A thermoplastic polyurethane and elastomer technology, applied in the field of polyurethane, can solve the problems of high price of PPDI, high vapor pressure, increased cost, etc., and achieve good comprehensive mechanical properties, good high temperature resistance, and avoid the effect of adding volatilization.

Active Publication Date: 2011-09-28
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent information CN 101372552A discloses a high-strength heat-resistant thermoplastic polyurethane elastomer blend modification and its preparation method, which is to modify TPU by adding heat-resistant filler long carbon chain nylon to achieve the purpose of improving the heat resistance of the material , but this method does not prevent the thermal degradation of TPU, and it cannot fundamentally solve the problem of high temperature resistance of the material.
Patents US6521164, US5066762 and US6740727 report the technology of using p-phenylene diisocyanate (PPDI) as diisocyanate to synthesize TPU, but PPDI is not only expensive, but also has a high vapor pressure and a considerable sublimation tendency, which improves the protection of raw materials and labor protection. cost

Method used

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  • Heat-resistant thermoplastic polyurethane elastomer and preparation method thereof
  • Heat-resistant thermoplastic polyurethane elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a) Dehydrate 300g of PCL (PCL-2000) with a number-average molecular weight of 2000 at 100-105°C for 2 hours under a vacuum degree of -0.098--0.01MPa, add 148g of solid TODI, and react at a temperature of 80-85°C , a storage-stable prepolymer with an NCO mass fraction of 7.70% was obtained.

[0037] b) mix 74g 1,4-butanediol, 0.08g catalyst bismuth isooctanoate, 1g antioxidant Irgastab PUR68, 3g ultraviolet light absorber Tinuvin213 and 2g light stabilizer UV-765, and prepolymer with a) Mix in a ratio of 92:8 by mass.

[0038] c) The mixture in b) was vacuumed and defoamed, then poured into a mold at 180°C for 15 minutes for demoulding, and the semi-finished product after demoulding was placed in an oven at 120°C and aged for 24 hours to obtain a finished product. The main performance indicators are shown in Table 1.

Embodiment 2

[0040] a) Dehydrate 300g of PCL (PCL-1000) with a number-average molecular weight of 1000 at 100-105°C and a vacuum of -0.098--0.01MPa for 2 hours, add solid 123.7g TODI, and react at a temperature of 80-85°C , resulting in a storage-stable prepolymer with a mass fraction of NCO of 6.30%.

[0041] b) 124g of HQEE, 1g of antioxidant 1010, 3g of UV absorber Tinuvin213 and 2g of light stabilizer UV-765 were evenly mixed, and mixed with the prepolymer in a) at a mass ratio of 87:13.

[0042] c) The mixture in b) was defoamed in vacuum and poured into a mold at 180°C for 15 minutes for demoulding, and the semi-finished product after demoulding was placed in an oven at 100°C and aged for 20 hours to obtain a finished product. The main performance indicators are shown in Table 1.

Embodiment 3

[0044] a) Dehydrate 300g of PTMG (PTMG-2000) with a number-average molecular weight of 2000 at 100-105°C, vacuum degree -0.098-0.01MPa for 2h, add 103.2g of solid TODI, and carry out at a temperature of 80-85°C reaction to generate a storage-stable prepolymer with a mass fraction of NCO of 5.00%.

[0045] b) Mix 37g 1,4-butanediol, 0.02g catalyst bismuth carboxylate, 1g antioxidant 1135, 3g UV absorber Tinuvin571 and 2g light stabilizer UV-765, and mix with the prepolymer of a) Mix according to the ratio of mass ratio 95.7:4.3.

[0046] c) The mixture in b) was defoamed in vacuum and poured into a mold at 160°C for 15 minutes for demoulding, and the semi-finished product after demoulding was placed in an oven at 110°C and aged for 24 hours to obtain the finished product. The main performance indicators are shown in Table 1.

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Abstract

The invention discloses a heat-resistant thermoplastic polyurethane elastomer and a preparation method thereof. The preparation method comprises the following steps of: dehydrating 55-80 parts of macromolecular dihydric alcohol, then adding the dehydrated macromolecular dihydric alcohol into TODI (Toluene Diisocyanate), reacting at the temperature of 75-120 DEG C to generate a prepolymer which has good storage stability and contains 3.0% to 9.0% of NCO; uniformly mixing 1.5-13 parts of chain extender, 0.001-0.1 part of catalyst, 0.05-1 part of oxidation inhibitor, 0.2-1 part of ultraviolet light absorbent and 0.2-2 parts of light stabilizer, and then mixing with the prepolymer in the step (a); vacuumizing and deforming the mixture in the step (b), and then pouring into a mould of 140-200 DEG C for demoulding for 10-25min; and curing the demoulded semi-finished products in a drying oven of 100-120 DEG C for 20-24 hours to obtain a finished product. The polyurethane elastomer has good high-temperature resistant property; the ratio of the storage modulus measured at 75 DEG C and 150 DEG C is less than 1.5; and the polyurethane elastomer has good integrated mechanical property and low cost.

Description

technical field [0001] The invention belongs to the field of polyurethane, in particular to a heat-resistant thermoplastic polyurethane elastomer and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane elastomer (TPU) is composed of linear polyol (usually polyester or polyether polyol), organic diisocyanate and small molecule chain extender. Its overall performance depends on the type of polyol, the structure of isocyanate and chain extender, and the ratio of soft and hard segments. By selecting the components of TPU and adjusting their proportions, the properties of the material can be changed in a wide range, so that it has both the flexibility of rubber and the rigidity of plastic, and has high strength, high elongation and high elasticity. characteristic. TPU also has excellent tear resistance, wear resistance, low temperature resistance and other properties, but the high temperature resistance of TPU is poor, once its working tempera...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/10C08K5/3435C08K5/134C08K5/3475
Inventor 石雅琳苏丽丽韦永继姚庆伦张永王亚萌
Owner LIMING RES INST OF CHEM IND
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