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High-performance thermoplastic polyurethane and its preparation method

A thermoplastic polyurethane and diisocyanate technology, which is applied in the field of high-performance thermoplastic polyurethane and its preparation, can solve the problems of short gel time, reduce polyurethane performance, affect production, etc., and achieve the effects of high toughness, high hardness and easy operation.

Active Publication Date: 2014-05-21
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method prepares high-hardness thermoplastic polyurethane, which affects the actual production due to the short gel time, which limits the application of high-hardness polyurethane to a certain extent, especially in domestic applications
On the other hand, increasing the hardness of thermoplastic polyurethane by blindly increasing the amount of isocyanate and chain extender will reduce other properties of polyurethane, such as impact performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Dehydrate polypropylene glycol (molecular weight: 400) and 1,6-hexanediol in vacuum at 100°C for 4 hours, weigh 20 parts of dried polypropylene glycol (molecular weight: 400), and 18.9 parts of dried chain-extended Agent 1,6-hexanediol and 61.1 parts of 4,4'-diphenylmethane diisocyanate MDI were mixed, stirred and vacuumed for 3 minutes at a stirring speed of 120r / min, and mixed evenly;

[0029] (2) Pour the above homogeneous mixture into a mold coated with a silicone release agent (preheated at 90°C), cure in a vacuum oven at 90°C for 4 hours, and mature at 120°C for 10 hours;

[0030] (3) Take out the matured high-performance thermoplastic polyurethane, cool it to room temperature, and measure its mechanical properties. The hardness is measured according to GB / T531-2009, and the tensile strength is measured according to GB / T 528-2009. Charpy notched impact The performance is measured according to GB / T1043-2008, and the performance test results are shown in Table 1...

Embodiment 2

[0032] (1) Dehydrate polypropylene glycol (molecular weight: 1000) and 3,3'-dichloro-4,4'-diaminodiphenylmethane at 120°C for 2 hours in vacuum, weigh 20 parts of dried polypropylene glycol ( The molecular weight is 1000), 19.8 parts of dried chain extender 3,3'-dichloro-4,4'-diaminodiphenylmethane and 59.7 parts of 4,4'-diphenylmethane diisocyanate MDI are mixed, 120r / Stir at a stirring speed of min and vacuumize for 3 min, mix well;

[0033] (2) Pour the above homogeneous mixture into a mold coated with a silicone release agent (preheated at 95°C), cure in a vacuum oven at 95°C for 3.5 hours, and cure at 130°C for 9 hours;

[0034] (3) Take out the matured high-performance thermoplastic polyurethane, cool it to room temperature, and measure its mechanical properties. The hardness is measured according to GB / T531-2009, and the tensile strength is measured according to GB / T 528-2009. Charpy notched impact The performance is measured according to GB / T1043-2008, and the perfor...

Embodiment 3

[0036] (1) Dehydrate polypropylene glycol (molecular weight: 200), polytetrahydrofuran diol (molecular weight: 2000) and 1,6-hexanediol in vacuum at 110°C for 3 hours, and weigh 20 parts of dried polypropylene glycol (molecular weight: 200) and polytetrahydrofuran diol (molecular weight 2000) (the weight fraction ratio of polypropylene glycol and polytetrahydrofuran is 5:1), 15 parts of dry chain extender 1,6-hexanediol and 65 parts of 4,4'-bis Benzene diisocyanate MDI was mixed, stirred and vacuumed for 3 minutes at a stirring speed of 120r / min, and mixed evenly;

[0037] (2) Pour the above homogeneous mixture into a mold coated with a silicone release agent (preheating temperature is 100°C), cure in a vacuum oven at 100°C for 3 hours, and mature at 140°C for 8 hours;

[0038] (3) Take out the matured high-performance thermoplastic polyurethane, cool it to room temperature, and measure its mechanical properties. The hardness is measured according to GB / T531-2009, and the tens...

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Abstract

The invention belongs to the technical field of polymer materials and relates to thermoplastic polyurethane and its preparation method. The thermoplastic polyurethane comprises the following components by weight: 20 to 50 parts of polyether polyol, 45 to 65 parts of diisocyanate and 5 to 20 parts of a chain extender. According to the invention, the one-step method is adopted for preparation of the thermoplastic polyurethane, polyol with low molecular weight or a compound of polyols with high molecular weight and low molecular weight, diisocyanate with different structures and the chain extender are employed, so the thermoplastic polyurethane with high hardness and high toughness is prepared.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a high-performance thermoplastic polyurethane and a preparation method thereof. Background technique [0002] High-hardness thermoplastic polyurethane generally refers to a Shore D hardness greater than 70, which is widely used in the production of pressure rollers, bearings, gears, stamping dies, bowling balls, shoe soles and cables. However, the application of high-hardness thermoplastic polyurethane in China is still quite limited at present, because the preparation of high-hardness polyurethane mainly adopts the prepolymerization method, and the hardness is increased by increasing the hard segment content. For the prepolymerization method, increasing the hard segment content means increasing the amount of isocyanate and chain extender. Generally speaking, the prepolymer of the high hardness polyurethane system has a higher NCO content, and the higher the NCO content, ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32
CPCC08G18/4825C08G18/4854C08G18/6674C08G18/6685
Inventor 刘明昌
Owner HEFEI GENIUS NEW MATERIALS
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