Polyurethanes made using bismuth thiocarbamate or thiocarbonate salts as catalysts

A dithiocarbonate and catalyst technology, applied in the field of polymer preparation, can solve the problems of short storage period, high reactivity of bismuth catalyst, loss of activity, etc.

Active Publication Date: 2015-03-04
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned in WO 2005 / 058996, those bismuth catalysts are inherently too reactive, leading to short pot lives when used in polyurethane elastomer systems
Furthermore, WO 2005 / 058996 reports that these catalysts tend to lose activity when stored in polyols

Method used

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  • Polyurethanes made using bismuth thiocarbamate or thiocarbonate salts as catalysts
  • Polyurethanes made using bismuth thiocarbamate or thiocarbonate salts as catalysts
  • Polyurethanes made using bismuth thiocarbamate or thiocarbonate salts as catalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and 2

[0093] Examples 1 and 2 and comparative samples A and B

[0094] The catalyst solution was prepared as follows: 0.2 parts of bis(n-hexyldithiocarbamate)bismuth(III) was dissolved in 0.8 parts of tripropylene glycol and 1 part of 3,7-dimethyloctanol.

Embodiment 1

[0095] Example 1 : A master batch comprising 7774 parts of 6000 molecular weight ethylene oxide terminated poly(propylene oxide) triol, 1078 parts of 1,4-butanediol and 177 parts of silica-alumina was blended in a mechanical mixer Salt molecular sieve paste. 66.6 samples of this master batch were dispensed into plastic cups suitable for use on the FlakTex Speedmixer. 0.43 parts of the catalyst solution was added to the master batch and the mixture was mixed on the Speedmixer for 90 seconds. Then, 34.5 parts of modified MDI having an isocyanate functionality of about 2.1 were mixed into the polyol mixture for 60 seconds. The reaction mixture was then poured into a steel plate mold sprayed with an external mold release agent and preheated to 80°C. Measure tack free time and demold time. Tack-free time is the time after pouring that the composition no longer sticks to the metal spatula on which it is indicated. The demold time is the time necessary before the part can be dem...

Embodiment 2

[0096] Example 2 : The sample was prepared in the same manner as in Example 1, except that the amount of the catalyst solution was increased to 0.59 parts. The results are shown in Table 1.

[0097] Comparative sample A : Comparative Sample A was prepared in the same general manner as Example 1, except that the catalyst was 0.18 parts of titanium catalyst complex, which was supplied by Alfa Aesar, a Johnson Matthey company as Snapcure TM 2210 Commercial for sale.

[0098] Comparative sample B It was prepared as follows: 7 g of the polyol master batch were mixed with 50 microliters of a solution of 25.8 mmoles of bismuth tris(dodecylmercaptan) in 4 mL of toluene. This gave 0.323 mmol of catalyst. About 3.5 g of a 160.1 isocyanate equivalent uretonimine-modified diphenylmethane diisocyanate having an average of 2.1 isocyanate groups per molecule were added. This time is denoted as t=0. The resulting mixture was stirred at room temperature for 2 minutes and 45 seconds ...

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Abstract

Polyisocyanate-based polymers are formed by curing a reaction mixture containing at least one polyisocyanate and at least one isocyanate-reactive compound having at least two isocyanate-reactive groups in the presence of a bismuth mono- or dithiocarbamate or mono- or dithiocarbonate salt.

Description

technical field [0001] The present invention relates to a process for the preparation of polymers from polyisocyanates and isocyanate-reactive materials. The invention is particularly useful in the preparation of cast polyurethane elastomers. Background technique [0002] Many solid or microcellular polyurethane elastomers are prepared using the cast elastomer method. These elastomers are prepared by reacting high equivalent weight polyols and chain extender materials with polyisocyanate compounds. Since a highly flexible rubber-like product is usually intended, the amount of chain extender in the formulation is usually somewhat small. Elastomers are prepared by mixing the starting materials and transferring the mixture to a mold where it is cured, typically by the application of heat. Some or all of the high equivalent weight polyols may be pre-reacted with polyisocyanates in a preliminary step to form isocyanate-terminated prepolymers or quasi-prepolymers. Such a prepo...

Claims

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Application Information

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IPC IPC(8): C08G18/65C08G18/76C08G18/22
CPCC08G18/7671C08G18/7664C08G18/4883C08G18/227C08G18/3206C08G18/6564C08G18/10C08G18/14C08G2110/005C08G2110/0058
Inventor R·J·基顿P·M·马格尔S·D·博尔特D·R·罗默N·威尔莫特R·杜加尔
Owner DOW GLOBAL TECH LLC
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