Two-component polyurethane casting compound with adjustable pot life
A technology of polyurethane and composition, which is applied in the field of seams or cracks and filling cavities, and can solve problems such as water hazards, health hazards, and increased viscosity
Active Publication Date: 2021-07-23
SIKA TECH AG
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- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, this is only marginally satisfactory
While the pot life of such compositions can be relatively well controlled, the increase in viscosity during pot life is not negligible and the wait time before the cast composition reaches sufficiently high strength is at least several hours to a day
In addition, the mentioned polyamine crosslinkers are often a health hazard and are harmful to water
Method used
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preparation example Construction
[0106] The preparation of the two components is preferably carried out separately in the case of excluding moisture. Both components are usually stored in their respective containers. Other components of the polyurethane composition may be present as a component of the first or second component, wherein the other component of the isocyanate group is preferably a component of the first component. Suitable containers for storing individual components, especially buckets, bottles, bags, buckets, cans, cartridges or tubes. Both components are stable, that is, they can save months to one year and longer before use, and will not change their respective properties at their own extent.
[0107] The two components are stored separately from each other before the mixing composition and mix it in use or before use. The components are advantageously present in a package composed of two spaces separated from each other.
[0108] In another aspect, the present invention includes a package consi...
Embodiment
[0137] Table 1: Substances used
[0138]
[0139]
[0140] Preparation of polyurethane compositions
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Abstract
The present invention relates to a polyurethane composition consisting of a first and a second component, the first component containing a polyol with an OH functionality in the range of 1.5 to 4 and a mean molecular weight in the range of 250 to 15,000 g / mol, a diol with two hydroxyl groups which are linked via a C2 to C9 carbon chain, and a compound which has at least one thiol group. One of the two components also contains at least one metal catalyst, for the reaction of hydroxyl groups and isocyanate groups which can form thio complexes, and the molar ratio of all the NCO groups of the polyisocyanates to all the OH groups of the polyols is 0.9 : 1 - 1.2 : 1, and the polyurethane composition is flowable, preferably self-levelling, directly after mixing of the components at 23 DEG C and has a viscosity of < 5000 Pa.s at a shear rate of 0.01 s-1 and < 500 Pa.s at a shear rate of 1 s-1 and < 50 Pa.s at a shear rate of 10 s-1. Furthermore, the molar ratio of all the thiol groups of the said compound to all the metal atoms of the metal catalyst is between 1:1 and 250:1. A composition of this type allows the open time to be set as desired within certain limits and makes it possible to achieve long open times with subsequent very quick curing of the composition. The composition according to the invention is particularly suitable as a casting compound, for example for repairing tracks.
Description
Technical field [0001] The field of the present invention is a low viscosity bicomponent polyurethane composition and a method of filling cavities, seams or cracks using the polyurethane composition. Background technique [0002] A two-component polyurethane composition based on polyol and polyisocyanate has long been used for a long time. An advantage of the two-component polyurethane composition relative to the monocomposite polyurethane composition is rapidly curing after mixing and thus can absorb and deliver higher force after a short time. Furthermore, it does not rely on external curing factors such as air moisture and heat supply), so even if the layer is thick or larger, it can be uniform and rapidly cured at room temperature. Therefore, the two-component polyurethane composition has been successfully used as a cast material for a long time. The casting material is used in the industry. There are a variety of applications for repair purposes, such as in the manufacture o...
Claims
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IPC IPC(8): C08K3/013C08K3/04C08K3/26C08K3/34C08G18/48C08G18/66C08G18/76C08G18/79C08G18/22C08G18/32C08G18/38
CPCC08G18/227C08G18/3206C08G18/3876C08G18/4812C08G18/4825C08G18/485C08G18/6677C08G18/7671C08G18/797C08K3/013C08K3/04C08K3/34C08K2003/265C08L75/08C08G18/24C08G18/7657
Inventor A·科萨罗F·肖非特
Owner SIKA TECH AG