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Polyaspartates with long pot life and fast cure

A polyurea and hardener technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as short pot life, limited product chemical and physical properties, and difficulty in large-scale application

Active Publication Date: 2022-05-10
SIKA TECH AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, based on their curing chemistry, they suffer from an inherent problem: they can be formulated to exhibit rapid curing after application, which is ideal for an efficient and economically viable process, but their pot lives are often short , which makes it difficult to apply to large areas
This composition appears to have increased pot life but still cures quickly, possibly due to its higher hydrophilicity, but requires the use of less common polyether aspartate which is not readily available in the market commercially available, and the chemical and physical properties of the product are limited to some extent compared with traditional polyaspartic acids, because polyether segments are inevitably introduced into the cured composition
Also, it is not well suited for pouring or thick layer applications

Method used

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  • Polyaspartates with long pot life and fast cure
  • Polyaspartates with long pot life and fast cure
  • Polyaspartates with long pot life and fast cure

Examples

Experimental program
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Embodiment

[0126] The invention is further illustrated in the following experimental part, which should not be construed as limiting the scope of the invention.

[0127] Additives used

[0128] Salt hydrate: ZnSO 4 x 7 H 2 O, K / NaC 4 h 4 o 6 x 4 H 2 O(VWR Chemicals)

[0129] catalyst: SA-1 / 10 (Air Products)

[0130] Sample Preparation

[0131] will be available from Covestro's N 3300 (an HDI trimer with an NCO content of 21.8 ± 0.3%) was used as polyisocyanate component C1-1 and was compared with that available from Covestro as hardener component C2-1. NH 1420 (polyaspartic acid secondary amine, amine value 199-203) is mixed, and the weight ratio of C1-1:C2-1 is 100:70.

[0132] The hardener component C2-1 contained a certain amount of water or salt hydrate or catalyst, the respective experiments are detailed in Table 1. By first mixing 250 g of hardener resin with a given amount of salt hydrate (or water, or catalyst) for 5 minutes, then adding the mixture to a bead ...

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Abstract

The invention relates to a two-component polyurea composition comprising a polyisocyanate component C1 and a hardener component C2. The hardener component C2 comprises a mixture of at least one aspartic acid and at least one salt hydrate SH with a decomposition temperature of 30-150° C. The composition allows application to large areas and / or thick layers or high volume castings and exhibits rapid cure triggered by heat but has a long pot life at application temperatures.

Description

technical field [0001] The present invention relates to the field of two-component polyurea compositions containing polyaspartate hardeners. [0002] Background of the invention [0003] Two-component polyurea compositions have been known for a long time and are widely used, for example, in the preparation of coatings and flooring products or casting resins. Among these, the so-called polyaspartic acid resins have unique properties and fields of application, since they contain special sterically hindered secondary amines, known as polyaspartic esters, as hardener components. These two-component aspartic acid compositions have the advantages of low viscosity, ultra-high solids, high reactivity and excellent chemical, physical and weather resistance. [0004] However, based on their curing chemistry, they suffer from an inherent problem: they can be formulated to exhibit rapid curing after application, which is ideal for an efficient and economically viable process, but their ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/79C08G18/38C08L75/02
CPCC08K2003/321C08G18/792C08K3/26C08K3/32C08G18/3821C08L75/02C08K2003/262C08K2003/3045C08K2003/325C08K2003/3063C08K2003/326C08K3/30C08K5/098C09D175/02
Inventor D·科普H·施威格尔特
Owner SIKA TECH AG
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