A kind of preparation technology of casting type polyurethane elastomer

A polyurethane elastomer and preparation technology, which is applied in the field of polyurethane materials, can solve the problems of long operating time and curing time, can not effectively solve the problems of chemical bubbles, and the time-consuming vacuum dehydration scheme, etc., and achieve a wide range of hardness adjustment, long curing time, The effect of low equipment requirements

Active Publication Date: 2022-07-12
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The vacuum dehydration scheme takes a long time, and the water removal effect cannot be guaranteed; the catalyst scheme achieves solidification and molding before the generation of air bubbles at the cost of shortening the operation time, but downstream customers need a longer operation time and curing time during the construction process. On the one hand, it can achieve one-time mixing and multiple constructions, which is beneficial to improve efficiency. On the other hand, a longer curing time can fully release the internal stress of the material during the molding process to improve the mechanical properties of the material.
Therefore, in view of the fact that none of the current technical means can effectively solve the problem of chemical air bubbles, this patent aims to provide a preparation process for cast polyurethane elastomers that can remove chemical air bubbles and require less water content in polyol components

Method used

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  • A kind of preparation technology of casting type polyurethane elastomer
  • A kind of preparation technology of casting type polyurethane elastomer
  • A kind of preparation technology of casting type polyurethane elastomer

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A preparation process of a casting type polyurethane elastomer, comprising the following steps:

[0038] 1) Weigh 100 g of polyether polyol R2307, add 10 g of IPDI to it, and add 0.03 g of PC5, mix well and react at room temperature for 24 hours. Then add 0.1g dibutyltin dilaurate, 0.1g defoamer, mix evenly and vacuum defoaming, the vacuum degree is ≧-0.095MPa to prepare elastomer A material, which is sealed and stored for later use.

[0039] 2) Weigh equal parts of IPDI and HT600 respectively, mix them evenly and vacuum defoaming, the vacuum degree is ≧-0.095MPa, to obtain the elastomer B material, which is sealed and stored for later use.

[0040]3) Mix the elastomers A and B evenly at room temperature according to the mass ratio of 2.3:1, remove mechanical bubbles in a vacuum, the vacuum degree is ≧-0.095MPa, pour into the mold for sealing reaction, and take out after 8 hours. Finally, it was put into an oven at 80° C. and aged for 2 hours to obtain a transparent po...

Embodiment 2

[0042] 1) Weigh 100 g of polyether polyol R2310, add 5 g of IPDI to it, and add 0.02 g of BDMAEE, mix well and react at room temperature for 24 hours. Then add 0.15g stannous octoate and 0.2g defoamer, mix evenly and vacuum defoaming, the vacuum degree is ≧-0.095MPa, to prepare the elastomer A material, which is sealed and stored for later use.

[0043] 2) According to the mass ratio of HMDI:HT600=9:2, weigh the materials respectively, mix them evenly and vacuum defoaming, the vacuum degree is ≧-0.095MPa, to obtain the elastomer B material, which is sealed and stored for later use.

[0044] 3) Mix the elastomers A and B evenly at room temperature according to the mass ratio of 3:1, remove the mechanical bubbles by vacuum, the vacuum degree is ≧-0.095MPa, pour into the mold for sealing reaction, and take out after 8 hours. Finally, it was put into a 60°C oven and aged for 5 hours to obtain a transparent polyurethane elastomer.

Embodiment 3

[0046] 1) Weigh 73 g of polyether polyol R2303 and 27 g of R2403 respectively, mix them uniformly, add 7 g of HDI to them, and add 0.02 g of PC5 and mix them uniformly and react at room temperature for 24 hours. Then add 0.08g dibutyltin dilaurate, 0.15g defoamer, mix evenly and vacuum defoaming, the vacuum degree is ≧-0.095MPa to prepare elastomer A material, which is sealed and stored for later use.

[0047] 2) According to the mass ratio of IPDI:HT600=9:1, weigh the materials respectively, mix them evenly and vacuum degassing, and the vacuum degree is ≧-0.095MPa to obtain the elastomer B material, which is sealed and stored for later use.

[0048] 3) Mix the elastomers A and B evenly at room temperature according to the mass ratio of 1:1, remove the mechanical bubbles by vacuum, the vacuum degree is ≧-0.095MPa, pour into the mold for sealing reaction, and take out after 8 hours. Finally, it was put into a 120°C oven and aged for 1 h to obtain a transparent polyurethane elas...

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Abstract

The present invention provides a process for preparing a cast-type polyurethane elastomer, which comprises the following steps: 1) reacting isocyanate with polyether polyol or polyester polyol in the presence of a tertiary amine catalyst, then adding an organic metal catalyst, eliminating 2) Using isocyanate or a prepolymer of isocyanate as elastomer B; 3) Mixing elastomers A and B in a mass ratio of 1:1 to 3:1. In the present invention, through simple prepolymer conversion, the water in the polyol is first reacted, and then the OH-terminated prepolymer, unreacted polyether polyol or polyester polyol in the elastomer A material and isocyanate or The prepolymer of isocyanate is reacted to generate polyurethane elastomer, which has the advantages of simple process and avoids the generation of chemical bubbles, and can solve the problem of bubbles in polyurethane elastomer due to high moisture content caused by polyols not strictly preserved.

Description

technical field [0001] The invention relates to a preparation process of a polyurethane elastomer, in particular to a preparation process of a high-hardness cast-type polyurethane elastomer, and belongs to the technical field of polyurethane materials. Background technique [0002] Polyurethane elastomer (PUE, Polyurethane Elastomer) is a kind of polymer synthetic material with excellent comprehensive properties, including cast polyurethane elastomer (CPU), thermoplastic polyurethane elastomer (TPU) and mixing polyurethane elastomer (MPU) Wait. CPU is a viscous liquid before processing and molding. It is made of liquid oligomer polyol, isocyanate and small molecule chain extender as raw materials. The processing and molding method of liquid mixing and casting is used. product. The CPU molding process is simple, the formed elastomer has a high degree of molecular integrity, maximizes the characteristics of polyurethane elastomers, and has better overall performance than MPU...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48
CPCC08G18/48C08G18/4804
Inventor 刘子厚刘赵兴丁宗雷滕向
Owner WANHUA CHEM GRP CO LTD
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