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Polyurethane, raw material composition, mixed liquid chain extender and preparation methods of them

A technology of raw material composition and polyurethane, which is applied in the field of polyurethane, can solve problems such as unfavorable operation and inconvenient use, and achieve the effects of shortening the use time, convenient and quick use, and lowering the use temperature

Inactive Publication Date: 2015-03-25
SHANGHAI BAOSONG HEAVY MACHINERY ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a polyurethane, a raw material composition, a mixed liquid chain extender and its preparation in order to overcome the defects that the existing polyurethane chain extender is solid at normal temperature, inconvenient to use, and unfavorable to operation. method

Method used

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  • Polyurethane, raw material composition, mixed liquid chain extender and preparation methods of them
  • Polyurethane, raw material composition, mixed liquid chain extender and preparation methods of them
  • Polyurethane, raw material composition, mixed liquid chain extender and preparation methods of them

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Preparation of mixed liquid chain extender

[0036] 30.5 parts of 3,3′-dichloro-4,4′-diaminodiphenylmethane (MOCA), 26.5 parts of dimethylthiotoluenediamine (DMTDA), 28 parts of diethyltoluenediamine (DETDA) After mixing with 15 parts of diethylene glycol dibenzoate (DEDB) under vacuum, the above mixture was dehydrated at 80°C under stirring (speed 150 rpm), until 3,3′-dichloro- After 4,4′-diaminodiphenylmethane is completely dissolved, cool down to 45°C, stop stirring, and wait until no bubbles come out, then cool to room temperature and the color is brown. Store the mixed liquid chain extender prepared above in a corrosion-resistant iron bucket, and store it with nitrogen gas.

[0037] Put the chain extender prepared in this example into a transparent plastic cup, seal it, and store it in a -7°C freezer. No solid matter was found to be precipitated for 8, 16, 24, and 48 hours. Therefore, the chain extender of this example It is a viscous liquid at room temperature. ...

Embodiment 2

[0039] 30.5 parts of 3,3′-dichloro-4,4′-diaminodiphenylmethane (MOCA), 26.5 parts of dimethylthiotoluenediamine (DMTDA), 28 parts of diethyltoluenediamine (DETDA) After mixing with 15 parts of diethylene glycol dibenzoate (DEDB) under vacuum, the above mixture was dehydrated at 90°C under stirring (speed 180 rpm), until 3,3′-dichloro- After 4,4′-diaminodiphenylmethane is completely dissolved, cool down to 45°C, stop stirring, and wait until no bubbles come out, then cool to room temperature and the color is brown. Store the mixed liquid chain extender prepared above in a corrosion-resistant iron bucket, and store it with nitrogen gas.

[0040] Put the chain extender prepared in this example into a transparent plastic cup, seal it, and store it in a -7°C freezer. No solid matter was found to be precipitated for 8, 16, 24, and 48 hours. Therefore, the chain extender of this example It is a viscous liquid at room temperature.

Embodiment 3

[0042] 28.5 parts of 3,3′-dichloro-4,4′-diaminodiphenylmethane (MOCA), 28.5 parts of dimethylthiotoluenediamine (DMTDA), 26 parts of diethyltoluenediamine (DETDA) After mixing with 12 parts of diethylene glycol dibenzoate (DEDB) under vacuum, the above mixture was dehydrated at 70°C under stirring (speed 130 rpm), until 3,3′-dichloro- After 4,4′-diaminodiphenylmethane is completely dissolved, cool down to 45°C, stop stirring, and wait until no bubbles come out, then cool to room temperature and the color is brown. Store the mixed liquid chain extender prepared above in a corrosion-resistant iron bucket, and store it with nitrogen gas.

[0043] Put the chain extender prepared in this example into a transparent plastic cup, seal it, and store it in a -7°C freezer. No solid matter was found to be precipitated for 8, 16, 24, and 48 hours. Therefore, the chain extender of this example It is a viscous liquid at room temperature.

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Abstract

The invention discloses polyurethane, a raw material composition and a mixed liquid chain extender and preparation methods of them. The raw material composition of the mixed liquid chain extender used for preparing the polyurethane comprises the following components: 23-24 parts by weight of 3,3'-dichloro-4,4'-diaminodibenzylmethane, 22-29 parts by weight of dimethythiotoluenediamine, 24-32 parts by weight of diethyltoluenediamine and 10-19 parts by weight of di(ethylene glycol) dibenzoate. According to the invention, the liquid chain extender can be used in spin casting and can be used directly without heating to melt for the liquid state itself. Compared with a solid chain extender, the liquid chain extender with short usage time is convenient to use.

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to polyurethane, a raw material composition, a mixed liquid chain extender and a preparation method thereof. Background technique [0002] The development of polyurethane elastomers is very rapid. Polyurethane elastomers occupy a very important position in the polyurethane industry, and the proportion of CPU (casting polyurethane elastomers) in polyurethane elastomers is much higher than that of TPU (thermoplastic polyurethane elastomers) and MPU ( Mixable polyurethane elastomer). Polyurethane elastomers have excellent tensile, tearing, oil, acid and alkali resistance properties, and can be widely used in various industries. However, in the production process of polyurethane, we often have to face that the commonly used chain extender 3,3′-dichloro-4,4′-diaminodiphenylmethane (MOCA, Moka) is solid and needs to be heated to 100°C Therefore, in long-term research, people hope to find a d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/32C08G18/30C08G18/10C08L75/04
CPCC08G18/3243C08G18/10C08G18/324
Inventor 付选显
Owner SHANGHAI BAOSONG HEAVY MACHINERY ENG GRP