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Preparation of thermoplastic polyurethane elastomer with polypropylene carbonate as soft segment

A technology of polypropylene carbonate and thermoplastic polyurethane, which is applied in the field of preparing thermoplastic polyurethane elastomers, can solve the problems of inconvenient production and processing, complex manufacturing process and high requirements, and achieve the effects of low production cost, free adjustment of tensile properties, and excellent performance

Inactive Publication Date: 2012-12-26
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polyurethane elastomers are basically synthesized by casting. The main raw materials are polypropylene carbonate, toluene diisocyanate, and trimethylolpropane. The disadvantage is that the elastomers are thermosetting and cross-linked, which is not convenient for production and processing. Complex process and high requirements

Method used

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  • Preparation of thermoplastic polyurethane elastomer with polypropylene carbonate as soft segment
  • Preparation of thermoplastic polyurethane elastomer with polypropylene carbonate as soft segment
  • Preparation of thermoplastic polyurethane elastomer with polypropylene carbonate as soft segment

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Raw materials: 36 g of PPC (molecular weight: 2650), 5.76 g of TDI, 1.5 g of 1,4-butanediol, 0.2 g of dibutyltin dilaurate, and 50 g of ethyl acetate.

[0016] The operation process is as follows: first put TDI into a three-necked flask, then add ethyl acetate and dibutyltin dilaurate. Polypropylene carbonate polyol (PPC) was slowly added dropwise into a three-necked flask in a constant pressure funnel, and the reaction temperature was maintained at 70°C. After reacting for 3 hours, add 1,4 butanediol to carry out chain extension reaction. After reacting for 2 hours, pour the viscous liquid onto a polytetrafluoroethylene board to lay a film. After natural drying for 24 hours, the obtained film is vacuum-dried at 60°C for 24 hours. Obtain the sample, and the sample is used for infrared qualitative analysis and tensile strength test. The experimental data are as follows: figure 2 , as shown in TPUPPC 1 in Table 1.

Embodiment 2

[0018] Raw materials: 30g of PPC (molecular weight: 2650), 5.95g of TDI, 1.6g of ethylene glycol (EO), 0.1g of stannous zincate, and 50g of acetone.

[0019] The operation process is as follows: first put TDI into a three-necked flask, then add acetone (solvent) and stannous zincate. Polypropylene carbonate polyol (PPC) was slowly added dropwise into a three-necked flask in a constant pressure funnel, and the reaction temperature was maintained at 75°C. After reacting for 2 hours, add ethylene glycol (EO) to carry out chain extension reaction. After reacting for 3 hours, pour the viscous liquid onto a polytetrafluoroethylene board to lay a film. After natural drying for 25 hours, the resulting film was vacuum-dried at 60°C for 24 hours. Get the sample, the sample is used for infrared qualitative analysis and tensile strength test, the experimental data figure 2 , as shown in TPUPPC 2 in Table 1.

Embodiment 3

[0021] Raw materials: 25 g of PPC (molecular weight: 2650), 6.11 g of TDI, 2.2 g of 1,4-butanediol (BDO), 0.1 g of stannous zincate, and 50 g of ethyl acetate.

[0022] The operation process is as follows: first put TDI into a three-necked flask, and then add ethyl acetate (solvent) and stannous zincate. Polypropylene carbonate polyol (PPC) was slowly added dropwise into a three-necked flask in a constant pressure funnel, and the reaction temperature was maintained at 65°C. After reacting for 4 hours, add 1,4 butanediol (BDO) to carry out chain extension reaction. After reacting for 3 hours, pour the viscous liquid onto a polytetrafluoroethylene board to lay a film. Vacuum drying for 24 hours to obtain the sample, the sample for infrared qualitative analysis and tensile strength test, experimental data figure 2 , as shown in TPUPPC 3 in Table 1.

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Abstract

The invention relates to a method for preparation of a thermoplastic polyurethane elastomer with polypropylene carbonate as a soft segment. The method consists of: first adding diisocyanate and a catalyst into polypropylene carbonate polyol to undergo a reaction, then adding a chain extender to carry out a chain extension reaction, and conducting drying and curing to obtain the thermoplastic polyurethane elastomer. The invention has the characteristics of simple process, abundant raw material sources, land ow production cost. By employing a prepolymerization method for preparation of the thermoplastic polyurethane elastomer, the prepared product does not turn yellow, has strong plasticity and excellent performance, and the tensile property of the elastomer can be adjusted at will.

Description

technical field [0001] The invention belongs to the field of thermoplastic materials, and relates to a method for synthesizing a poly(propylene carbonate) polyurethane elastomer by a solution method or a bulk method, in particular to a method for preparing a thermoplastic polyurethane elastomer by using polypropylene carbonate as a soft segment. Background technique [0002] Due to its good physical and chemical properties and fully biodegradable properties, thermoplastic polyurethane elastomers can be widely used in fields such as films, spinning, industrial casings, sealing strips, and artificial organs. They are the best alternatives to PVC and PU. The ideal material is internationally known as a new polymer material. [0003] Polypropylene carbonate (PPC) is made of carbon dioxide (CO 2 ) and propylene oxide (PO) copolymerization, it is a fully biodegradable material, its raw material sources are abundant, the price is low, the product elongation at break is high and tr...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/44C08G18/10
Inventor 庞素娟王亦云徐鼐潘莉莎卢凌彬张武元刘晓娟
Owner HAINAN UNIVERSITY
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