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Two-part polyurethanes based on hyperbranched polymers

一种双组分聚氨酯、超支化共聚物的技术，应用在聚脲/聚氨酯涂料、涂层等方向，能够解决短适用期等问题，达到长适用期、低粘度、快速固化的效果

Inactive Publication Date: 2013-05-01
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, they also have a short pot-life, which can be a problem for some applications, especially for larger areas

Method used

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  • Two-part polyurethanes based on hyperbranched polymers
  • Two-part polyurethanes based on hyperbranched polymers
  • Two-part polyurethanes based on hyperbranched polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0145] raw material

[0146] Table 1. Raw materials (used as received without further processing)

[0147]

[0148]

[0149] Preparation of hyperbranched polyols using 2-mercaptoethanol as chain transfer catalyst: HP-Ref.

[0150] 3.380kg (3.380 moles) of methyl methacrylate, 1.020kg (7.075 moles) of hydroxypropyl methacrylate, 1.000kg (7.032 moles) of n-butyl methacrylate, 0.800kg (4.040 moles) of di Ethylene glycol methacrylate, 0.840 kg (10.769 moles) of 2-mercaptoethanol, 0.500 kg of n-butyl acetate and 0.160 kg (0.974 moles) of 2,2'-azobis(isobutyronitrile) were added in 10 -L preparation vessel, and the mixture was degassed by bubbling nitrogen for 30 minutes with gentle stirring. 1.500kg of n-butyl acetate was added to the equipment equipped with condenser, 4-knife propeller stirrer and N 2 Import into a 10-liter reaction vessel and heat to above 80 °C. Under stirring, the monomer mixture obtained in the preparation vessel was added to the reaction vessel u...

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Abstract

The present invention relates to two-part polyurethane compositions. This two-part composition consists of a first pack (C1) and a second pack (C2). The first pack (C1) comprises at least one hyperbranched copolymer (HBC) having pending OH groups and which is prepared from at least one or more monomer(s) (M2) having at least two unsaturated C-C bonds and one or more monomer(s) (MH) having one unsaturated C-C bonds and one hydroxyl group in the presence of a cobalt (II) complex (CC). The second pack (C2) comprises at least one polyisocyanate (PI). It has been possible to offer a two-part polyurethane composition which has low viscosity, long pot life, fast cure, excellent weathering and UV resistance and is particularly suitable for the use as coating.

Description

technical field [0001] The present invention relates to the field of two-component polyurethane compositions. Background technique [0002] Two-component polyurethanes are a proven technology for a variety of applications. In particular two-component polyurethane compositions are known, wherein one component comprises polyols and the second component comprises polyisocyanates. A wide range of molecules are known as polyols, such as polyether polyols, polyester polyols and acrylic polyols. These known two-component polyurethanes cure particularly fast. Furthermore, they also have only a short pot-life, which is a problem for some applications, especially for larger areas. Furthermore, unfortunately, they also tend to have rather high viscosities after mixing. Additional solvents are required to reduce viscosity. However, this goes against the trend in the market for stricter regulations requiring the reduction of solvents or VOCs (Volatile Organic Compounds), both on eco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/62C08F2/38
CPCC08G18/6229C08F2/38C08G18/6254C09D175/08C08G18/62C08L75/04
Inventor S·刘N·卡特L·丹尼尔斯
Owner SIKA TECH AG
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